substantial, so users of MultiMaster Host Adapters may not
wish to include it.
+config LIBFC
+ tristate "LibFC module"
+ depends on SCSI && SCSI_FC_ATTRS
+ ---help---
+ Fibre Channel library module
+
config SCSI_DMX3191D
tristate "DMX3191D SCSI support"
depends on PCI && SCSI
obj-$(CONFIG_SCSI_SRP_ATTRS) += scsi_transport_srp.o
obj-$(CONFIG_SCSI_DH) += device_handler/
+obj-$(CONFIG_LIBFC) += libfc/
obj-$(CONFIG_ISCSI_TCP) += libiscsi.o libiscsi_tcp.o iscsi_tcp.o
obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
obj-$(CONFIG_SCSI_A4000T) += 53c700.o a4000t.o
--- /dev/null
+# $Id: Makefile
+
+obj-$(CONFIG_LIBFC) += libfc.o
+
+libfc-objs := \
+ fc_disc.o \
+ fc_exch.o \
+ fc_elsct.o \
+ fc_frame.o \
+ fc_lport.o \
+ fc_rport.o \
+ fc_fcp.o
--- /dev/null
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Target Discovery
+ *
+ * This block discovers all FC-4 remote ports, including FCP initiators. It
+ * also handles RSCN events and re-discovery if necessary.
+ */
+
+/*
+ * DISC LOCKING
+ *
+ * The disc mutex is can be locked when acquiring rport locks, but may not
+ * be held when acquiring the lport lock. Refer to fc_lport.c for more
+ * details.
+ */
+
+#include <linux/timer.h>
+#include <linux/err.h>
+#include <asm/unaligned.h>
+
+#include <scsi/fc/fc_gs.h>
+
+#include <scsi/libfc.h>
+
+#define FC_DISC_RETRY_LIMIT 3 /* max retries */
+#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */
+
+#define FC_DISC_DELAY 3
+
+static int fc_disc_debug;
+
+#define FC_DEBUG_DISC(fmt...) \
+ do { \
+ if (fc_disc_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static void fc_disc_gpn_ft_req(struct fc_disc *);
+static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);
+static int fc_disc_new_target(struct fc_disc *, struct fc_rport *,
+ struct fc_rport_identifiers *);
+static void fc_disc_del_target(struct fc_disc *, struct fc_rport *);
+static void fc_disc_done(struct fc_disc *);
+static void fc_disc_timeout(struct work_struct *);
+static void fc_disc_single(struct fc_disc *, struct fc_disc_port *);
+static void fc_disc_restart(struct fc_disc *);
+
+/**
+ * fc_disc_lookup_rport - lookup a remote port by port_id
+ * @lport: Fibre Channel host port instance
+ * @port_id: remote port port_id to match
+ */
+struct fc_rport *fc_disc_lookup_rport(const struct fc_lport *lport,
+ u32 port_id)
+{
+ const struct fc_disc *disc = &lport->disc;
+ struct fc_rport *rport, *found = NULL;
+ struct fc_rport_libfc_priv *rdata;
+ int disc_found = 0;
+
+ list_for_each_entry(rdata, &disc->rports, peers) {
+ rport = PRIV_TO_RPORT(rdata);
+ if (rport->port_id == port_id) {
+ disc_found = 1;
+ found = rport;
+ break;
+ }
+ }
+
+ if (!disc_found)
+ found = NULL;
+
+ return found;
+}
+
+/**
+ * fc_disc_stop_rports - delete all the remote ports associated with the lport
+ * @disc: The discovery job to stop rports on
+ *
+ * Locking Note: This function expects that the lport mutex is locked before
+ * calling it.
+ */
+void fc_disc_stop_rports(struct fc_disc *disc)
+{
+ struct fc_lport *lport;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata, *next;
+
+ lport = disc->lport;
+
+ mutex_lock(&disc->disc_mutex);
+ list_for_each_entry_safe(rdata, next, &disc->rports, peers) {
+ rport = PRIV_TO_RPORT(rdata);
+ list_del(&rdata->peers);
+ lport->tt.rport_logoff(rport);
+ }
+
+ mutex_unlock(&disc->disc_mutex);
+}
+
+/**
+ * fc_disc_rport_callback - Event handler for rport events
+ * @lport: The lport which is receiving the event
+ * @rport: The rport which the event has occured on
+ * @event: The event that occured
+ *
+ * Locking Note: The rport lock should not be held when calling
+ * this function.
+ */
+static void fc_disc_rport_callback(struct fc_lport *lport,
+ struct fc_rport *rport,
+ enum fc_rport_event event)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_disc *disc = &lport->disc;
+ int found = 0;
+
+ FC_DEBUG_DISC("Received a %d event for port (%6x)\n", event,
+ rport->port_id);
+
+ if (event == RPORT_EV_CREATED) {
+ if (disc) {
+ found = 1;
+ mutex_lock(&disc->disc_mutex);
+ list_add_tail(&rdata->peers, &disc->rports);
+ mutex_unlock(&disc->disc_mutex);
+ }
+ }
+
+ if (!found)
+ FC_DEBUG_DISC("The rport (%6x) is not maintained "
+ "by the discovery layer\n", rport->port_id);
+}
+
+/**
+ * fc_disc_recv_rscn_req - Handle Registered State Change Notification (RSCN)
+ * @sp: Current sequence of the RSCN exchange
+ * @fp: RSCN Frame
+ * @lport: Fibre Channel host port instance
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ * before it is called.
+ */
+static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_disc *disc)
+{
+ struct fc_lport *lport;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+ struct fc_els_rscn *rp;
+ struct fc_els_rscn_page *pp;
+ struct fc_seq_els_data rjt_data;
+ unsigned int len;
+ int redisc = 0;
+ enum fc_els_rscn_ev_qual ev_qual;
+ enum fc_els_rscn_addr_fmt fmt;
+ LIST_HEAD(disc_ports);
+ struct fc_disc_port *dp, *next;
+
+ lport = disc->lport;
+
+ FC_DEBUG_DISC("Received an RSCN event on port (%6x)\n",
+ fc_host_port_id(lport->host));
+
+ /* make sure the frame contains an RSCN message */
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+ if (!rp)
+ goto reject;
+ /* make sure the page length is as expected (4 bytes) */
+ if (rp->rscn_page_len != sizeof(*pp))
+ goto reject;
+ /* get the RSCN payload length */
+ len = ntohs(rp->rscn_plen);
+ if (len < sizeof(*rp))
+ goto reject;
+ /* make sure the frame contains the expected payload */
+ rp = fc_frame_payload_get(fp, len);
+ if (!rp)
+ goto reject;
+ /* payload must be a multiple of the RSCN page size */
+ len -= sizeof(*rp);
+ if (len % sizeof(*pp))
+ goto reject;
+
+ for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) {
+ ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT;
+ ev_qual &= ELS_RSCN_EV_QUAL_MASK;
+ fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT;
+ fmt &= ELS_RSCN_ADDR_FMT_MASK;
+ /*
+ * if we get an address format other than port
+ * (area, domain, fabric), then do a full discovery
+ */
+ switch (fmt) {
+ case ELS_ADDR_FMT_PORT:
+ FC_DEBUG_DISC("Port address format for port (%6x)\n",
+ ntoh24(pp->rscn_fid));
+ dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+ if (!dp) {
+ redisc = 1;
+ break;
+ }
+ dp->lp = lport;
+ dp->ids.port_id = ntoh24(pp->rscn_fid);
+ dp->ids.port_name = -1;
+ dp->ids.node_name = -1;
+ dp->ids.roles = FC_RPORT_ROLE_UNKNOWN;
+ list_add_tail(&dp->peers, &disc_ports);
+ break;
+ case ELS_ADDR_FMT_AREA:
+ case ELS_ADDR_FMT_DOM:
+ case ELS_ADDR_FMT_FAB:
+ default:
+ FC_DEBUG_DISC("Address format is (%d)\n", fmt);
+ redisc = 1;
+ break;
+ }
+ }
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ if (redisc) {
+ FC_DEBUG_DISC("RSCN received: rediscovering\n");
+ fc_disc_restart(disc);
+ } else {
+ FC_DEBUG_DISC("RSCN received: not rediscovering. "
+ "redisc %d state %d in_prog %d\n",
+ redisc, lport->state, disc->pending);
+ list_for_each_entry_safe(dp, next, &disc_ports, peers) {
+ list_del(&dp->peers);
+ rport = lport->tt.rport_lookup(lport, dp->ids.port_id);
+ if (rport) {
+ rdata = RPORT_TO_PRIV(rport);
+ list_del(&rdata->peers);
+ lport->tt.rport_logoff(rport);
+ }
+ fc_disc_single(disc, dp);
+ }
+ }
+ fc_frame_free(fp);
+ return;
+reject:
+ FC_DEBUG_DISC("Received a bad RSCN frame\n");
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_LOGIC;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_disc_recv_req - Handle incoming requests
+ * @sp: Current sequence of the request exchange
+ * @fp: The frame
+ * @lport: The FC local port
+ *
+ * Locking Note: This function is called from the EM and will lock
+ * the disc_mutex before calling the handler for the
+ * request.
+ */
+static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ u8 op;
+ struct fc_disc *disc = &lport->disc;
+
+ op = fc_frame_payload_op(fp);
+ switch (op) {
+ case ELS_RSCN:
+ mutex_lock(&disc->disc_mutex);
+ fc_disc_recv_rscn_req(sp, fp, disc);
+ mutex_unlock(&disc->disc_mutex);
+ break;
+ default:
+ FC_DBG("Received an unsupported request. opcode (%x)\n", op);
+ break;
+ }
+}
+
+/**
+ * fc_disc_restart - Restart discovery
+ * @lport: FC discovery context
+ *
+ * Locking Note: This function expects that the disc mutex
+ * is already locked.
+ */
+static void fc_disc_restart(struct fc_disc *disc)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata, *next;
+ struct fc_lport *lport = disc->lport;
+
+ FC_DEBUG_DISC("Restarting discovery for port (%6x)\n",
+ fc_host_port_id(lport->host));
+
+ list_for_each_entry_safe(rdata, next, &disc->rports, peers) {
+ rport = PRIV_TO_RPORT(rdata);
+ FC_DEBUG_DISC("list_del(%6x)\n", rport->port_id);
+ list_del(&rdata->peers);
+ lport->tt.rport_logoff(rport);
+ }
+
+ disc->requested = 1;
+ if (!disc->pending)
+ fc_disc_gpn_ft_req(disc);
+}
+
+/**
+ * fc_disc_start - Fibre Channel Target discovery
+ * @lport: FC local port
+ *
+ * Returns non-zero if discovery cannot be started.
+ */
+static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
+ enum fc_disc_event),
+ struct fc_lport *lport)
+{
+ struct fc_rport *rport;
+ struct fc_rport_identifiers ids;
+ struct fc_disc *disc = &lport->disc;
+
+ /*
+ * At this point we may have a new disc job or an existing
+ * one. Either way, let's lock when we make changes to it
+ * and send the GPN_FT request.
+ */
+ mutex_lock(&disc->disc_mutex);
+
+ disc->disc_callback = disc_callback;
+
+ /*
+ * If not ready, or already running discovery, just set request flag.
+ */
+ disc->requested = 1;
+
+ if (disc->pending) {
+ mutex_unlock(&disc->disc_mutex);
+ return;
+ }
+
+ /*
+ * Handle point-to-point mode as a simple discovery
+ * of the remote port. Yucky, yucky, yuck, yuck!
+ */
+ rport = disc->lport->ptp_rp;
+ if (rport) {
+ ids.port_id = rport->port_id;
+ ids.port_name = rport->port_name;
+ ids.node_name = rport->node_name;
+ ids.roles = FC_RPORT_ROLE_UNKNOWN;
+ get_device(&rport->dev);
+
+ if (!fc_disc_new_target(disc, rport, &ids)) {
+ disc->event = DISC_EV_SUCCESS;
+ fc_disc_done(disc);
+ }
+ put_device(&rport->dev);
+ } else {
+ fc_disc_gpn_ft_req(disc); /* get ports by FC-4 type */
+ }
+
+ mutex_unlock(&disc->disc_mutex);
+}
+
+static struct fc_rport_operations fc_disc_rport_ops = {
+ .event_callback = fc_disc_rport_callback,
+};
+
+/**
+ * fc_disc_new_target - Handle new target found by discovery
+ * @lport: FC local port
+ * @rport: The previous FC remote port (NULL if new remote port)
+ * @ids: Identifiers for the new FC remote port
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ * before it is called.
+ */
+static int fc_disc_new_target(struct fc_disc *disc,
+ struct fc_rport *rport,
+ struct fc_rport_identifiers *ids)
+{
+ struct fc_lport *lport = disc->lport;
+ struct fc_rport_libfc_priv *rp;
+ int error = 0;
+
+ if (rport && ids->port_name) {
+ if (rport->port_name == -1) {
+ /*
+ * Set WWN and fall through to notify of create.
+ */
+ fc_rport_set_name(rport, ids->port_name,
+ rport->node_name);
+ } else if (rport->port_name != ids->port_name) {
+ /*
+ * This is a new port with the same FCID as
+ * a previously-discovered port. Presumably the old
+ * port logged out and a new port logged in and was
+ * assigned the same FCID. This should be rare.
+ * Delete the old one and fall thru to re-create.
+ */
+ fc_disc_del_target(disc, rport);
+ rport = NULL;
+ }
+ }
+ if (((ids->port_name != -1) || (ids->port_id != -1)) &&
+ ids->port_id != fc_host_port_id(lport->host) &&
+ ids->port_name != lport->wwpn) {
+ if (!rport) {
+ rport = lport->tt.rport_lookup(lport, ids->port_id);
+ if (!rport) {
+ struct fc_disc_port dp;
+ dp.lp = lport;
+ dp.ids.port_id = ids->port_id;
+ dp.ids.port_name = ids->port_name;
+ dp.ids.node_name = ids->node_name;
+ dp.ids.roles = ids->roles;
+ rport = fc_rport_rogue_create(&dp);
+ }
+ if (!rport)
+ error = -ENOMEM;
+ }
+ if (rport) {
+ rp = rport->dd_data;
+ rp->ops = &fc_disc_rport_ops;
+ rp->rp_state = RPORT_ST_INIT;
+ lport->tt.rport_login(rport);
+ }
+ }
+ return error;
+}
+
+/**
+ * fc_disc_del_target - Delete a target
+ * @disc: FC discovery context
+ * @rport: The remote port to be removed
+ */
+static void fc_disc_del_target(struct fc_disc *disc, struct fc_rport *rport)
+{
+ struct fc_lport *lport = disc->lport;
+ struct fc_rport_libfc_priv *rdata = RPORT_TO_PRIV(rport);
+ list_del(&rdata->peers);
+ lport->tt.rport_logoff(rport);
+}
+
+/**
+ * fc_disc_done - Discovery has been completed
+ * @disc: FC discovery context
+ */
+static void fc_disc_done(struct fc_disc *disc)
+{
+ struct fc_lport *lport = disc->lport;
+
+ FC_DEBUG_DISC("Discovery complete for port (%6x)\n",
+ fc_host_port_id(lport->host));
+
+ disc->disc_callback(lport, disc->event);
+ disc->event = DISC_EV_NONE;
+
+ if (disc->requested)
+ fc_disc_gpn_ft_req(disc);
+ else
+ disc->pending = 0;
+}
+
+/**
+ * fc_disc_error - Handle error on dNS request
+ * @disc: FC discovery context
+ * @fp: The frame pointer
+ */
+static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
+{
+ struct fc_lport *lport = disc->lport;
+ unsigned long delay = 0;
+ if (fc_disc_debug)
+ FC_DBG("Error %ld, retries %d/%d\n",
+ PTR_ERR(fp), disc->retry_count,
+ FC_DISC_RETRY_LIMIT);
+
+ if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
+ /*
+ * Memory allocation failure, or the exchange timed out,
+ * retry after delay.
+ */
+ if (disc->retry_count < FC_DISC_RETRY_LIMIT) {
+ /* go ahead and retry */
+ if (!fp)
+ delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY);
+ else {
+ delay = msecs_to_jiffies(lport->e_d_tov);
+
+ /* timeout faster first time */
+ if (!disc->retry_count)
+ delay /= 4;
+ }
+ disc->retry_count++;
+ schedule_delayed_work(&disc->disc_work, delay);
+ } else {
+ /* exceeded retries */
+ disc->event = DISC_EV_FAILED;
+ fc_disc_done(disc);
+ }
+ }
+}
+
+/**
+ * fc_disc_gpn_ft_req - Send Get Port Names by FC-4 type (GPN_FT) request
+ * @lport: FC discovery context
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ * before it is called.
+ */
+static void fc_disc_gpn_ft_req(struct fc_disc *disc)
+{
+ struct fc_frame *fp;
+ struct fc_lport *lport = disc->lport;
+
+ WARN_ON(!fc_lport_test_ready(lport));
+
+ disc->pending = 1;
+ disc->requested = 0;
+
+ disc->buf_len = 0;
+ disc->seq_count = 0;
+ fp = fc_frame_alloc(lport,
+ sizeof(struct fc_ct_hdr) +
+ sizeof(struct fc_ns_gid_ft));
+ if (!fp)
+ goto err;
+
+ if (lport->tt.elsct_send(lport, NULL, fp,
+ FC_NS_GPN_FT,
+ fc_disc_gpn_ft_resp,
+ disc, lport->e_d_tov))
+ return;
+err:
+ fc_disc_error(disc, fp);
+}
+
+/**
+ * fc_disc_gpn_ft_parse - Parse the list of IDs and names resulting from a request
+ * @lport: Fibre Channel host port instance
+ * @buf: GPN_FT response buffer
+ * @len: size of response buffer
+ */
+static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
+{
+ struct fc_lport *lport;
+ struct fc_gpn_ft_resp *np;
+ char *bp;
+ size_t plen;
+ size_t tlen;
+ int error = 0;
+ struct fc_disc_port dp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+
+ lport = disc->lport;
+
+ /*
+ * Handle partial name record left over from previous call.
+ */
+ bp = buf;
+ plen = len;
+ np = (struct fc_gpn_ft_resp *)bp;
+ tlen = disc->buf_len;
+ if (tlen) {
+ WARN_ON(tlen >= sizeof(*np));
+ plen = sizeof(*np) - tlen;
+ WARN_ON(plen <= 0);
+ WARN_ON(plen >= sizeof(*np));
+ if (plen > len)
+ plen = len;
+ np = &disc->partial_buf;
+ memcpy((char *)np + tlen, bp, plen);
+
+ /*
+ * Set bp so that the loop below will advance it to the
+ * first valid full name element.
+ */
+ bp -= tlen;
+ len += tlen;
+ plen += tlen;
+ disc->buf_len = (unsigned char) plen;
+ if (plen == sizeof(*np))
+ disc->buf_len = 0;
+ }
+
+ /*
+ * Handle full name records, including the one filled from above.
+ * Normally, np == bp and plen == len, but from the partial case above,
+ * bp, len describe the overall buffer, and np, plen describe the
+ * partial buffer, which if would usually be full now.
+ * After the first time through the loop, things return to "normal".
+ */
+ while (plen >= sizeof(*np)) {
+ dp.lp = lport;
+ dp.ids.port_id = ntoh24(np->fp_fid);
+ dp.ids.port_name = ntohll(np->fp_wwpn);
+ dp.ids.node_name = -1;
+ dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
+
+ if ((dp.ids.port_id != fc_host_port_id(lport->host)) &&
+ (dp.ids.port_name != lport->wwpn)) {
+ rport = fc_rport_rogue_create(&dp);
+ if (rport) {
+ rdata = rport->dd_data;
+ rdata->ops = &fc_disc_rport_ops;
+ rdata->local_port = lport;
+ lport->tt.rport_login(rport);
+ } else
+ FC_DBG("Failed to allocate memory for "
+ "the newly discovered port (%6x)\n",
+ dp.ids.port_id);
+ }
+
+ if (np->fp_flags & FC_NS_FID_LAST) {
+ disc->event = DISC_EV_SUCCESS;
+ fc_disc_done(disc);
+ len = 0;
+ break;
+ }
+ len -= sizeof(*np);
+ bp += sizeof(*np);
+ np = (struct fc_gpn_ft_resp *)bp;
+ plen = len;
+ }
+
+ /*
+ * Save any partial record at the end of the buffer for next time.
+ */
+ if (error == 0 && len > 0 && len < sizeof(*np)) {
+ if (np != &disc->partial_buf) {
+ FC_DEBUG_DISC("Partial buffer remains "
+ "for discovery by (%6x)\n",
+ fc_host_port_id(lport->host));
+ memcpy(&disc->partial_buf, np, len);
+ }
+ disc->buf_len = (unsigned char) len;
+ } else {
+ disc->buf_len = 0;
+ }
+ return error;
+}
+
+/*
+ * Handle retry of memory allocation for remote ports.
+ */
+static void fc_disc_timeout(struct work_struct *work)
+{
+ struct fc_disc *disc = container_of(work,
+ struct fc_disc,
+ disc_work.work);
+ mutex_lock(&disc->disc_mutex);
+ if (disc->requested && !disc->pending)
+ fc_disc_gpn_ft_req(disc);
+ mutex_unlock(&disc->disc_mutex);
+}
+
+/**
+ * fc_disc_gpn_ft_resp - Handle a response frame from Get Port Names (GPN_FT)
+ * @sp: Current sequence of GPN_FT exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ * before it is called.
+ */
+static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *disc_arg)
+{
+ struct fc_disc *disc = disc_arg;
+ struct fc_ct_hdr *cp;
+ struct fc_frame_header *fh;
+ unsigned int seq_cnt;
+ void *buf = NULL;
+ unsigned int len;
+ int error;
+
+ FC_DEBUG_DISC("Received a GPN_FT response on port (%6x)\n",
+ fc_host_port_id(disc->lport->host));
+
+ if (IS_ERR(fp)) {
+ fc_disc_error(disc, fp);
+ return;
+ }
+
+ WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */
+ fh = fc_frame_header_get(fp);
+ len = fr_len(fp) - sizeof(*fh);
+ seq_cnt = ntohs(fh->fh_seq_cnt);
+ if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 &&
+ disc->seq_count == 0) {
+ cp = fc_frame_payload_get(fp, sizeof(*cp));
+ if (!cp) {
+ FC_DBG("GPN_FT response too short, len %d\n",
+ fr_len(fp));
+ } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
+
+ /*
+ * Accepted. Parse response.
+ */
+ buf = cp + 1;
+ len -= sizeof(*cp);
+ } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
+ FC_DBG("GPN_FT rejected reason %x exp %x "
+ "(check zoning)\n", cp->ct_reason,
+ cp->ct_explan);
+ disc->event = DISC_EV_FAILED;
+ fc_disc_done(disc);
+ } else {
+ FC_DBG("GPN_FT unexpected response code %x\n",
+ ntohs(cp->ct_cmd));
+ }
+ } else if (fr_sof(fp) == FC_SOF_N3 &&
+ seq_cnt == disc->seq_count) {
+ buf = fh + 1;
+ } else {
+ FC_DBG("GPN_FT unexpected frame - out of sequence? "
+ "seq_cnt %x expected %x sof %x eof %x\n",
+ seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp));
+ }
+ if (buf) {
+ error = fc_disc_gpn_ft_parse(disc, buf, len);
+ if (error)
+ fc_disc_error(disc, fp);
+ else
+ disc->seq_count++;
+ }
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_disc_single - Discover the directory information for a single target
+ * @lport: FC local port
+ * @dp: The port to rediscover
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ * before it is called.
+ */
+static void fc_disc_single(struct fc_disc *disc, struct fc_disc_port *dp)
+{
+ struct fc_lport *lport;
+ struct fc_rport *rport;
+ struct fc_rport *new_rport;
+ struct fc_rport_libfc_priv *rdata;
+
+ lport = disc->lport;
+
+ if (dp->ids.port_id == fc_host_port_id(lport->host))
+ goto out;
+
+ rport = lport->tt.rport_lookup(lport, dp->ids.port_id);
+ if (rport)
+ fc_disc_del_target(disc, rport);
+
+ new_rport = fc_rport_rogue_create(dp);
+ if (new_rport) {
+ rdata = new_rport->dd_data;
+ rdata->ops = &fc_disc_rport_ops;
+ kfree(dp);
+ lport->tt.rport_login(new_rport);
+ }
+ return;
+out:
+ kfree(dp);
+}
+
+/**
+ * fc_disc_stop - Stop discovery for a given lport
+ * @lport: The lport that discovery should stop for
+ */
+void fc_disc_stop(struct fc_lport *lport)
+{
+ struct fc_disc *disc = &lport->disc;
+
+ if (disc) {
+ cancel_delayed_work_sync(&disc->disc_work);
+ fc_disc_stop_rports(disc);
+ }
+}
+
+/**
+ * fc_disc_stop_final - Stop discovery for a given lport
+ * @lport: The lport that discovery should stop for
+ *
+ * This function will block until discovery has been
+ * completely stopped and all rports have been deleted.
+ */
+void fc_disc_stop_final(struct fc_lport *lport)
+{
+ fc_disc_stop(lport);
+ lport->tt.rport_flush_queue();
+}
+
+/**
+ * fc_disc_init - Initialize the discovery block
+ * @lport: FC local port
+ */
+int fc_disc_init(struct fc_lport *lport)
+{
+ struct fc_disc *disc;
+
+ if (!lport->tt.disc_start)
+ lport->tt.disc_start = fc_disc_start;
+
+ if (!lport->tt.disc_stop)
+ lport->tt.disc_stop = fc_disc_stop;
+
+ if (!lport->tt.disc_stop_final)
+ lport->tt.disc_stop_final = fc_disc_stop_final;
+
+ if (!lport->tt.disc_recv_req)
+ lport->tt.disc_recv_req = fc_disc_recv_req;
+
+ if (!lport->tt.rport_lookup)
+ lport->tt.rport_lookup = fc_disc_lookup_rport;
+
+ disc = &lport->disc;
+ INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);
+ mutex_init(&disc->disc_mutex);
+ INIT_LIST_HEAD(&disc->rports);
+
+ disc->lport = lport;
+ disc->delay = FC_DISC_DELAY;
+ disc->event = DISC_EV_NONE;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_disc_init);
--- /dev/null
+/*
+ * Copyright(c) 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Provide interface to send ELS/CT FC frames
+ */
+
+#include <asm/unaligned.h>
+#include <scsi/fc/fc_gs.h>
+#include <scsi/fc/fc_ns.h>
+#include <scsi/fc/fc_els.h>
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+/*
+ * fc_elsct_send - sends ELS/CT frame
+ */
+static struct fc_seq *fc_elsct_send(struct fc_lport *lport,
+ struct fc_rport *rport,
+ struct fc_frame *fp,
+ unsigned int op,
+ void (*resp)(struct fc_seq *,
+ struct fc_frame *fp,
+ void *arg),
+ void *arg, u32 timer_msec)
+{
+ enum fc_rctl r_ctl;
+ u32 did;
+ enum fc_fh_type fh_type;
+ int rc;
+
+ /* ELS requests */
+ if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
+ rc = fc_els_fill(lport, rport, fp, op, &r_ctl, &did, &fh_type);
+ else
+ /* CT requests */
+ rc = fc_ct_fill(lport, fp, op, &r_ctl, &did, &fh_type);
+
+ if (rc)
+ return NULL;
+
+ fc_fill_fc_hdr(fp, r_ctl, did, fc_host_port_id(lport->host), fh_type,
+ FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+
+ return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
+}
+
+int fc_elsct_init(struct fc_lport *lport)
+{
+ if (!lport->tt.elsct_send)
+ lport->tt.elsct_send = fc_elsct_send;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_elsct_init);
--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
+ * Copyright(c) 2008 Mike Christie
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Fibre Channel exchange and sequence handling.
+ */
+
+#include <linux/timer.h>
+#include <linux/gfp.h>
+#include <linux/err.h>
+
+#include <scsi/fc/fc_fc2.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+#define FC_DEF_R_A_TOV (10 * 1000) /* resource allocation timeout */
+
+/*
+ * fc_exch_debug can be set in debugger or at compile time to get more logs.
+ */
+static int fc_exch_debug;
+
+#define FC_DEBUG_EXCH(fmt...) \
+ do { \
+ if (fc_exch_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static struct kmem_cache *fc_em_cachep; /* cache for exchanges */
+
+/*
+ * Structure and function definitions for managing Fibre Channel Exchanges
+ * and Sequences.
+ *
+ * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
+ *
+ * fc_exch_mgr holds the exchange state for an N port
+ *
+ * fc_exch holds state for one exchange and links to its active sequence.
+ *
+ * fc_seq holds the state for an individual sequence.
+ */
+
+/*
+ * Exchange manager.
+ *
+ * This structure is the center for creating exchanges and sequences.
+ * It manages the allocation of exchange IDs.
+ */
+struct fc_exch_mgr {
+ enum fc_class class; /* default class for sequences */
+ spinlock_t em_lock; /* exchange manager lock,
+ must be taken before ex_lock */
+ u16 last_xid; /* last allocated exchange ID */
+ u16 min_xid; /* min exchange ID */
+ u16 max_xid; /* max exchange ID */
+ u16 max_read; /* max exchange ID for read */
+ u16 last_read; /* last xid allocated for read */
+ u32 total_exches; /* total allocated exchanges */
+ struct list_head ex_list; /* allocated exchanges list */
+ struct fc_lport *lp; /* fc device instance */
+ mempool_t *ep_pool; /* reserve ep's */
+
+ /*
+ * currently exchange mgr stats are updated but not used.
+ * either stats can be expose via sysfs or remove them
+ * all together if not used XXX
+ */
+ struct {
+ atomic_t no_free_exch;
+ atomic_t no_free_exch_xid;
+ atomic_t xid_not_found;
+ atomic_t xid_busy;
+ atomic_t seq_not_found;
+ atomic_t non_bls_resp;
+ } stats;
+ struct fc_exch **exches; /* for exch pointers indexed by xid */
+};
+#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
+
+static void fc_exch_rrq(struct fc_exch *);
+static void fc_seq_ls_acc(struct fc_seq *);
+static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason,
+ enum fc_els_rjt_explan);
+static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *);
+static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *);
+static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp);
+
+/*
+ * Internal implementation notes.
+ *
+ * The exchange manager is one by default in libfc but LLD may choose
+ * to have one per CPU. The sequence manager is one per exchange manager
+ * and currently never separated.
+ *
+ * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
+ * assigned by the Sequence Initiator that shall be unique for a specific
+ * D_ID and S_ID pair while the Sequence is open." Note that it isn't
+ * qualified by exchange ID, which one might think it would be.
+ * In practice this limits the number of open sequences and exchanges to 256
+ * per session. For most targets we could treat this limit as per exchange.
+ *
+ * The exchange and its sequence are freed when the last sequence is received.
+ * It's possible for the remote port to leave an exchange open without
+ * sending any sequences.
+ *
+ * Notes on reference counts:
+ *
+ * Exchanges are reference counted and exchange gets freed when the reference
+ * count becomes zero.
+ *
+ * Timeouts:
+ * Sequences are timed out for E_D_TOV and R_A_TOV.
+ *
+ * Sequence event handling:
+ *
+ * The following events may occur on initiator sequences:
+ *
+ * Send.
+ * For now, the whole thing is sent.
+ * Receive ACK
+ * This applies only to class F.
+ * The sequence is marked complete.
+ * ULP completion.
+ * The upper layer calls fc_exch_done() when done
+ * with exchange and sequence tuple.
+ * RX-inferred completion.
+ * When we receive the next sequence on the same exchange, we can
+ * retire the previous sequence ID. (XXX not implemented).
+ * Timeout.
+ * R_A_TOV frees the sequence ID. If we're waiting for ACK,
+ * E_D_TOV causes abort and calls upper layer response handler
+ * with FC_EX_TIMEOUT error.
+ * Receive RJT
+ * XXX defer.
+ * Send ABTS
+ * On timeout.
+ *
+ * The following events may occur on recipient sequences:
+ *
+ * Receive
+ * Allocate sequence for first frame received.
+ * Hold during receive handler.
+ * Release when final frame received.
+ * Keep status of last N of these for the ELS RES command. XXX TBD.
+ * Receive ABTS
+ * Deallocate sequence
+ * Send RJT
+ * Deallocate
+ *
+ * For now, we neglect conditions where only part of a sequence was
+ * received or transmitted, or where out-of-order receipt is detected.
+ */
+
+/*
+ * Locking notes:
+ *
+ * The EM code run in a per-CPU worker thread.
+ *
+ * To protect against concurrency between a worker thread code and timers,
+ * sequence allocation and deallocation must be locked.
+ * - exchange refcnt can be done atomicly without locks.
+ * - sequence allocation must be locked by exch lock.
+ * - If the em_lock and ex_lock must be taken at the same time, then the
+ * em_lock must be taken before the ex_lock.
+ */
+
+/*
+ * opcode names for debugging.
+ */
+static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT;
+
+#define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
+static inline const char *fc_exch_name_lookup(unsigned int op, char **table,
+ unsigned int max_index)
+{
+ const char *name = NULL;
+
+ if (op < max_index)
+ name = table[op];
+ if (!name)
+ name = "unknown";
+ return name;
+}
+
+static const char *fc_exch_rctl_name(unsigned int op)
+{
+ return fc_exch_name_lookup(op, fc_exch_rctl_names,
+ FC_TABLE_SIZE(fc_exch_rctl_names));
+}
+
+/*
+ * Hold an exchange - keep it from being freed.
+ */
+static void fc_exch_hold(struct fc_exch *ep)
+{
+ atomic_inc(&ep->ex_refcnt);
+}
+
+/*
+ * setup fc hdr by initializing few more FC header fields and sof/eof.
+ * Initialized fields by this func:
+ * - fh_ox_id, fh_rx_id, fh_seq_id, fh_seq_cnt
+ * - sof and eof
+ */
+static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp,
+ u32 f_ctl)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ u16 fill;
+
+ fr_sof(fp) = ep->class;
+ if (ep->seq.cnt)
+ fr_sof(fp) = fc_sof_normal(ep->class);
+
+ if (f_ctl & FC_FC_END_SEQ) {
+ fr_eof(fp) = FC_EOF_T;
+ if (fc_sof_needs_ack(ep->class))
+ fr_eof(fp) = FC_EOF_N;
+ /*
+ * Form f_ctl.
+ * The number of fill bytes to make the length a 4-byte
+ * multiple is the low order 2-bits of the f_ctl.
+ * The fill itself will have been cleared by the frame
+ * allocation.
+ * After this, the length will be even, as expected by
+ * the transport.
+ */
+ fill = fr_len(fp) & 3;
+ if (fill) {
+ fill = 4 - fill;
+ /* TODO, this may be a problem with fragmented skb */
+ skb_put(fp_skb(fp), fill);
+ hton24(fh->fh_f_ctl, f_ctl | fill);
+ }
+ } else {
+ WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
+ fr_eof(fp) = FC_EOF_N;
+ }
+
+ /*
+ * Initialize remainig fh fields
+ * from fc_fill_fc_hdr
+ */
+ fh->fh_ox_id = htons(ep->oxid);
+ fh->fh_rx_id = htons(ep->rxid);
+ fh->fh_seq_id = ep->seq.id;
+ fh->fh_seq_cnt = htons(ep->seq.cnt);
+}
+
+
+/*
+ * Release a reference to an exchange.
+ * If the refcnt goes to zero and the exchange is complete, it is freed.
+ */
+static void fc_exch_release(struct fc_exch *ep)
+{
+ struct fc_exch_mgr *mp;
+
+ if (atomic_dec_and_test(&ep->ex_refcnt)) {
+ mp = ep->em;
+ if (ep->destructor)
+ ep->destructor(&ep->seq, ep->arg);
+ if (ep->lp->tt.exch_put)
+ ep->lp->tt.exch_put(ep->lp, mp, ep->xid);
+ WARN_ON(!ep->esb_stat & ESB_ST_COMPLETE);
+ mempool_free(ep, mp->ep_pool);
+ }
+}
+
+static int fc_exch_done_locked(struct fc_exch *ep)
+{
+ int rc = 1;
+
+ /*
+ * We must check for completion in case there are two threads
+ * tyring to complete this. But the rrq code will reuse the
+ * ep, and in that case we only clear the resp and set it as
+ * complete, so it can be reused by the timer to send the rrq.
+ */
+ ep->resp = NULL;
+ if (ep->state & FC_EX_DONE)
+ return rc;
+ ep->esb_stat |= ESB_ST_COMPLETE;
+
+ if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
+ ep->state |= FC_EX_DONE;
+ if (cancel_delayed_work(&ep->timeout_work))
+ atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
+ rc = 0;
+ }
+ return rc;
+}
+
+static void fc_exch_mgr_delete_ep(struct fc_exch *ep)
+{
+ struct fc_exch_mgr *mp;
+
+ mp = ep->em;
+ spin_lock_bh(&mp->em_lock);
+ WARN_ON(mp->total_exches <= 0);
+ mp->total_exches--;
+ mp->exches[ep->xid - mp->min_xid] = NULL;
+ list_del(&ep->ex_list);
+ spin_unlock_bh(&mp->em_lock);
+ fc_exch_release(ep); /* drop hold for exch in mp */
+}
+
+/*
+ * Internal version of fc_exch_timer_set - used with lock held.
+ */
+static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
+ unsigned int timer_msec)
+{
+ if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
+ return;
+
+ FC_DEBUG_EXCH("Exchange (%4x) timed out, notifying the upper layer\n",
+ ep->xid);
+ if (schedule_delayed_work(&ep->timeout_work,
+ msecs_to_jiffies(timer_msec)))
+ fc_exch_hold(ep); /* hold for timer */
+}
+
+/*
+ * Set timer for an exchange.
+ * The time is a minimum delay in milliseconds until the timer fires.
+ * Used for upper level protocols to time out the exchange.
+ * The timer is cancelled when it fires or when the exchange completes.
+ * Returns non-zero if a timer couldn't be allocated.
+ */
+static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec)
+{
+ spin_lock_bh(&ep->ex_lock);
+ fc_exch_timer_set_locked(ep, timer_msec);
+ spin_unlock_bh(&ep->ex_lock);
+}
+
+int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec)
+{
+ struct fc_seq *sp;
+ struct fc_exch *ep;
+ struct fc_frame *fp;
+ int error;
+
+ ep = fc_seq_exch(req_sp);
+
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
+ ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) {
+ spin_unlock_bh(&ep->ex_lock);
+ return -ENXIO;
+ }
+
+ /*
+ * Send the abort on a new sequence if possible.
+ */
+ sp = fc_seq_start_next_locked(&ep->seq);
+ if (!sp) {
+ spin_unlock_bh(&ep->ex_lock);
+ return -ENOMEM;
+ }
+
+ ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL;
+ if (timer_msec)
+ fc_exch_timer_set_locked(ep, timer_msec);
+ spin_unlock_bh(&ep->ex_lock);
+
+ /*
+ * If not logged into the fabric, don't send ABTS but leave
+ * sequence active until next timeout.
+ */
+ if (!ep->sid)
+ return 0;
+
+ /*
+ * Send an abort for the sequence that timed out.
+ */
+ fp = fc_frame_alloc(ep->lp, 0);
+ if (fp) {
+ fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
+ FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+ error = fc_seq_send(ep->lp, sp, fp);
+ } else
+ error = -ENOBUFS;
+ return error;
+}
+EXPORT_SYMBOL(fc_seq_exch_abort);
+
+/*
+ * Exchange timeout - handle exchange timer expiration.
+ * The timer will have been cancelled before this is called.
+ */
+static void fc_exch_timeout(struct work_struct *work)
+{
+ struct fc_exch *ep = container_of(work, struct fc_exch,
+ timeout_work.work);
+ struct fc_seq *sp = &ep->seq;
+ void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
+ void *arg;
+ u32 e_stat;
+ int rc = 1;
+
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
+ goto unlock;
+
+ e_stat = ep->esb_stat;
+ if (e_stat & ESB_ST_COMPLETE) {
+ ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
+ if (e_stat & ESB_ST_REC_QUAL)
+ fc_exch_rrq(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ goto done;
+ } else {
+ resp = ep->resp;
+ arg = ep->arg;
+ ep->resp = NULL;
+ if (e_stat & ESB_ST_ABNORMAL)
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+ if (resp)
+ resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg);
+ fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
+ goto done;
+ }
+unlock:
+ spin_unlock_bh(&ep->ex_lock);
+done:
+ /*
+ * This release matches the hold taken when the timer was set.
+ */
+ fc_exch_release(ep);
+}
+
+/*
+ * Allocate a sequence.
+ *
+ * We don't support multiple originated sequences on the same exchange.
+ * By implication, any previously originated sequence on this exchange
+ * is complete, and we reallocate the same sequence.
+ */
+static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
+{
+ struct fc_seq *sp;
+
+ sp = &ep->seq;
+ sp->ssb_stat = 0;
+ sp->cnt = 0;
+ sp->id = seq_id;
+ return sp;
+}
+
+/*
+ * fc_em_alloc_xid - returns an xid based on request type
+ * @lp : ptr to associated lport
+ * @fp : ptr to the assocated frame
+ *
+ * check the associated fc_fsp_pkt to get scsi command type and
+ * command direction to decide from which range this exch id
+ * will be allocated from.
+ *
+ * Returns : 0 or an valid xid
+ */
+static u16 fc_em_alloc_xid(struct fc_exch_mgr *mp, const struct fc_frame *fp)
+{
+ u16 xid, min, max;
+ u16 *plast;
+ struct fc_exch *ep = NULL;
+
+ if (mp->max_read) {
+ if (fc_frame_is_read(fp)) {
+ min = mp->min_xid;
+ max = mp->max_read;
+ plast = &mp->last_read;
+ } else {
+ min = mp->max_read + 1;
+ max = mp->max_xid;
+ plast = &mp->last_xid;
+ }
+ } else {
+ min = mp->min_xid;
+ max = mp->max_xid;
+ plast = &mp->last_xid;
+ }
+ xid = *plast;
+ do {
+ xid = (xid == max) ? min : xid + 1;
+ ep = mp->exches[xid - mp->min_xid];
+ } while ((ep != NULL) && (xid != *plast));
+
+ if (unlikely(ep))
+ xid = 0;
+ else
+ *plast = xid;
+
+ return xid;
+}
+
+/*
+ * fc_exch_alloc - allocate an exchange.
+ * @mp : ptr to the exchange manager
+ * @xid: input xid
+ *
+ * if xid is supplied zero then assign next free exchange ID
+ * from exchange manager, otherwise use supplied xid.
+ * Returns with exch lock held.
+ */
+struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
+ struct fc_frame *fp, u16 xid)
+{
+ struct fc_exch *ep;
+
+ /* allocate memory for exchange */
+ ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
+ if (!ep) {
+ atomic_inc(&mp->stats.no_free_exch);
+ goto out;
+ }
+ memset(ep, 0, sizeof(*ep));
+
+ spin_lock_bh(&mp->em_lock);
+ /* alloc xid if input xid 0 */
+ if (!xid) {
+ /* alloc a new xid */
+ xid = fc_em_alloc_xid(mp, fp);
+ if (!xid) {
+ printk(KERN_ERR "fc_em_alloc_xid() failed\n");
+ goto err;
+ }
+ }
+
+ fc_exch_hold(ep); /* hold for exch in mp */
+ spin_lock_init(&ep->ex_lock);
+ /*
+ * Hold exch lock for caller to prevent fc_exch_reset()
+ * from releasing exch while fc_exch_alloc() caller is
+ * still working on exch.
+ */
+ spin_lock_bh(&ep->ex_lock);
+
+ mp->exches[xid - mp->min_xid] = ep;
+ list_add_tail(&ep->ex_list, &mp->ex_list);
+ fc_seq_alloc(ep, ep->seq_id++);
+ mp->total_exches++;
+ spin_unlock_bh(&mp->em_lock);
+
+ /*
+ * update exchange
+ */
+ ep->oxid = ep->xid = xid;
+ ep->em = mp;
+ ep->lp = mp->lp;
+ ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
+ ep->rxid = FC_XID_UNKNOWN;
+ ep->class = mp->class;
+ INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout);
+out:
+ return ep;
+err:
+ spin_unlock_bh(&mp->em_lock);
+ atomic_inc(&mp->stats.no_free_exch_xid);
+ mempool_free(ep, mp->ep_pool);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_exch_alloc);
+
+/*
+ * Lookup and hold an exchange.
+ */
+static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
+{
+ struct fc_exch *ep = NULL;
+
+ if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
+ spin_lock_bh(&mp->em_lock);
+ ep = mp->exches[xid - mp->min_xid];
+ if (ep) {
+ fc_exch_hold(ep);
+ WARN_ON(ep->xid != xid);
+ }
+ spin_unlock_bh(&mp->em_lock);
+ }
+ return ep;
+}
+
+void fc_exch_done(struct fc_seq *sp)
+{
+ struct fc_exch *ep = fc_seq_exch(sp);
+ int rc;
+
+ spin_lock_bh(&ep->ex_lock);
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+}
+EXPORT_SYMBOL(fc_exch_done);
+
+/*
+ * Allocate a new exchange as responder.
+ * Sets the responder ID in the frame header.
+ */
+static struct fc_exch *fc_exch_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_exch *ep;
+ struct fc_frame_header *fh;
+ u16 rxid;
+
+ ep = mp->lp->tt.exch_get(mp->lp, fp);
+ if (ep) {
+ ep->class = fc_frame_class(fp);
+
+ /*
+ * Set EX_CTX indicating we're responding on this exchange.
+ */
+ ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */
+ ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */
+ fh = fc_frame_header_get(fp);
+ ep->sid = ntoh24(fh->fh_d_id);
+ ep->did = ntoh24(fh->fh_s_id);
+ ep->oid = ep->did;
+
+ /*
+ * Allocated exchange has placed the XID in the
+ * originator field. Move it to the responder field,
+ * and set the originator XID from the frame.
+ */
+ ep->rxid = ep->xid;
+ ep->oxid = ntohs(fh->fh_ox_id);
+ ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
+ if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
+ ep->esb_stat &= ~ESB_ST_SEQ_INIT;
+
+ /*
+ * Set the responder ID in the frame header.
+ * The old one should've been 0xffff.
+ * If it isn't, don't assign one.
+ * Incoming basic link service frames may specify
+ * a referenced RX_ID.
+ */
+ if (fh->fh_type != FC_TYPE_BLS) {
+ rxid = ntohs(fh->fh_rx_id);
+ WARN_ON(rxid != FC_XID_UNKNOWN);
+ fh->fh_rx_id = htons(ep->rxid);
+ }
+ fc_exch_hold(ep); /* hold for caller */
+ spin_unlock_bh(&ep->ex_lock); /* lock from exch_get */
+ }
+ return ep;
+}
+
+/*
+ * Find a sequence for receive where the other end is originating the sequence.
+ * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
+ * on the ep that should be released by the caller.
+ */
+static enum fc_pf_rjt_reason
+fc_seq_lookup_recip(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_exch *ep = NULL;
+ struct fc_seq *sp = NULL;
+ enum fc_pf_rjt_reason reject = FC_RJT_NONE;
+ u32 f_ctl;
+ u16 xid;
+
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
+
+ /*
+ * Lookup or create the exchange if we will be creating the sequence.
+ */
+ if (f_ctl & FC_FC_EX_CTX) {
+ xid = ntohs(fh->fh_ox_id); /* we originated exch */
+ ep = fc_exch_find(mp, xid);
+ if (!ep) {
+ atomic_inc(&mp->stats.xid_not_found);
+ reject = FC_RJT_OX_ID;
+ goto out;
+ }
+ if (ep->rxid == FC_XID_UNKNOWN)
+ ep->rxid = ntohs(fh->fh_rx_id);
+ else if (ep->rxid != ntohs(fh->fh_rx_id)) {
+ reject = FC_RJT_OX_ID;
+ goto rel;
+ }
+ } else {
+ xid = ntohs(fh->fh_rx_id); /* we are the responder */
+
+ /*
+ * Special case for MDS issuing an ELS TEST with a
+ * bad rxid of 0.
+ * XXX take this out once we do the proper reject.
+ */
+ if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
+ fc_frame_payload_op(fp) == ELS_TEST) {
+ fh->fh_rx_id = htons(FC_XID_UNKNOWN);
+ xid = FC_XID_UNKNOWN;
+ }
+
+ /*
+ * new sequence - find the exchange
+ */
+ ep = fc_exch_find(mp, xid);
+ if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
+ if (ep) {
+ atomic_inc(&mp->stats.xid_busy);
+ reject = FC_RJT_RX_ID;
+ goto rel;
+ }
+ ep = fc_exch_resp(mp, fp);
+ if (!ep) {
+ reject = FC_RJT_EXCH_EST; /* XXX */
+ goto out;
+ }
+ xid = ep->xid; /* get our XID */
+ } else if (!ep) {
+ atomic_inc(&mp->stats.xid_not_found);
+ reject = FC_RJT_RX_ID; /* XID not found */
+ goto out;
+ }
+ }
+
+ /*
+ * At this point, we have the exchange held.
+ * Find or create the sequence.
+ */
+ if (fc_sof_is_init(fr_sof(fp))) {
+ sp = fc_seq_start_next(&ep->seq);
+ if (!sp) {
+ reject = FC_RJT_SEQ_XS; /* exchange shortage */
+ goto rel;
+ }
+ sp->id = fh->fh_seq_id;
+ sp->ssb_stat |= SSB_ST_RESP;
+ } else {
+ sp = &ep->seq;
+ if (sp->id != fh->fh_seq_id) {
+ atomic_inc(&mp->stats.seq_not_found);
+ reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */
+ goto rel;
+ }
+ }
+ WARN_ON(ep != fc_seq_exch(sp));
+
+ if (f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+
+ fr_seq(fp) = sp;
+out:
+ return reject;
+rel:
+ fc_exch_done(&ep->seq);
+ fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */
+ return reject;
+}
+
+/*
+ * Find the sequence for a frame being received.
+ * We originated the sequence, so it should be found.
+ * We may or may not have originated the exchange.
+ * Does not hold the sequence for the caller.
+ */
+static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_exch *ep;
+ struct fc_seq *sp = NULL;
+ u32 f_ctl;
+ u16 xid;
+
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
+ xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
+ ep = fc_exch_find(mp, xid);
+ if (!ep)
+ return NULL;
+ if (ep->seq.id == fh->fh_seq_id) {
+ /*
+ * Save the RX_ID if we didn't previously know it.
+ */
+ sp = &ep->seq;
+ if ((f_ctl & FC_FC_EX_CTX) != 0 &&
+ ep->rxid == FC_XID_UNKNOWN) {
+ ep->rxid = ntohs(fh->fh_rx_id);
+ }
+ }
+ fc_exch_release(ep);
+ return sp;
+}
+
+/*
+ * Set addresses for an exchange.
+ * Note this must be done before the first sequence of the exchange is sent.
+ */
+static void fc_exch_set_addr(struct fc_exch *ep,
+ u32 orig_id, u32 resp_id)
+{
+ ep->oid = orig_id;
+ if (ep->esb_stat & ESB_ST_RESP) {
+ ep->sid = resp_id;
+ ep->did = orig_id;
+ } else {
+ ep->sid = orig_id;
+ ep->did = resp_id;
+ }
+}
+
+static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
+{
+ struct fc_exch *ep = fc_seq_exch(sp);
+
+ sp = fc_seq_alloc(ep, ep->seq_id++);
+ FC_DEBUG_EXCH("exch %4x f_ctl %6x seq %2x\n",
+ ep->xid, ep->f_ctl, sp->id);
+ return sp;
+}
+/*
+ * Allocate a new sequence on the same exchange as the supplied sequence.
+ * This will never return NULL.
+ */
+struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
+{
+ struct fc_exch *ep = fc_seq_exch(sp);
+
+ spin_lock_bh(&ep->ex_lock);
+ WARN_ON((ep->esb_stat & ESB_ST_COMPLETE) != 0);
+ sp = fc_seq_start_next_locked(sp);
+ spin_unlock_bh(&ep->ex_lock);
+
+ return sp;
+}
+EXPORT_SYMBOL(fc_seq_start_next);
+
+int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp)
+{
+ struct fc_exch *ep;
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ int error;
+ u32 f_ctl;
+
+ ep = fc_seq_exch(sp);
+ WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT);
+
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fc_exch_setup_hdr(ep, fp, f_ctl);
+
+ /*
+ * update sequence count if this frame is carrying
+ * multiple FC frames when sequence offload is enabled
+ * by LLD.
+ */
+ if (fr_max_payload(fp))
+ sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)),
+ fr_max_payload(fp));
+ else
+ sp->cnt++;
+
+ /*
+ * Send the frame.
+ */
+ error = lp->tt.frame_send(lp, fp);
+
+ /*
+ * Update the exchange and sequence flags,
+ * assuming all frames for the sequence have been sent.
+ * We can only be called to send once for each sequence.
+ */
+ spin_lock_bh(&ep->ex_lock);
+ ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */
+ if (f_ctl & (FC_FC_END_SEQ | FC_FC_SEQ_INIT))
+ ep->esb_stat &= ~ESB_ST_SEQ_INIT;
+ spin_unlock_bh(&ep->ex_lock);
+ return error;
+}
+EXPORT_SYMBOL(fc_seq_send);
+
+void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
+ struct fc_seq_els_data *els_data)
+{
+ switch (els_cmd) {
+ case ELS_LS_RJT:
+ fc_seq_ls_rjt(sp, els_data->reason, els_data->explan);
+ break;
+ case ELS_LS_ACC:
+ fc_seq_ls_acc(sp);
+ break;
+ case ELS_RRQ:
+ fc_exch_els_rrq(sp, els_data->fp);
+ break;
+ case ELS_REC:
+ fc_exch_els_rec(sp, els_data->fp);
+ break;
+ default:
+ FC_DBG("Invalid ELS CMD:%x\n", els_cmd);
+ }
+}
+EXPORT_SYMBOL(fc_seq_els_rsp_send);
+
+/*
+ * Send a sequence, which is also the last sequence in the exchange.
+ */
+static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
+ enum fc_rctl rctl, enum fc_fh_type fh_type)
+{
+ u32 f_ctl;
+ struct fc_exch *ep = fc_seq_exch(sp);
+
+ f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ f_ctl |= ep->f_ctl;
+ fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0);
+ fc_seq_send(ep->lp, sp, fp);
+}
+
+/*
+ * Send ACK_1 (or equiv.) indicating we received something.
+ * The frame we're acking is supplied.
+ */
+static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
+{
+ struct fc_frame *fp;
+ struct fc_frame_header *rx_fh;
+ struct fc_frame_header *fh;
+ struct fc_exch *ep = fc_seq_exch(sp);
+ struct fc_lport *lp = ep->lp;
+ unsigned int f_ctl;
+
+ /*
+ * Don't send ACKs for class 3.
+ */
+ if (fc_sof_needs_ack(fr_sof(rx_fp))) {
+ fp = fc_frame_alloc(lp, 0);
+ if (!fp)
+ return;
+
+ fh = fc_frame_header_get(fp);
+ fh->fh_r_ctl = FC_RCTL_ACK_1;
+ fh->fh_type = FC_TYPE_BLS;
+
+ /*
+ * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
+ * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
+ * Bits 9-8 are meaningful (retransmitted or unidirectional).
+ * Last ACK uses bits 7-6 (continue sequence),
+ * bits 5-4 are meaningful (what kind of ACK to use).
+ */
+ rx_fh = fc_frame_header_get(rx_fp);
+ f_ctl = ntoh24(rx_fh->fh_f_ctl);
+ f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
+ FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
+ FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
+ FC_FC_RETX_SEQ | FC_FC_UNI_TX;
+ f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
+ hton24(fh->fh_f_ctl, f_ctl);
+
+ fc_exch_setup_hdr(ep, fp, f_ctl);
+ fh->fh_seq_id = rx_fh->fh_seq_id;
+ fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
+ fh->fh_parm_offset = htonl(1); /* ack single frame */
+
+ fr_sof(fp) = fr_sof(rx_fp);
+ if (f_ctl & FC_FC_END_SEQ)
+ fr_eof(fp) = FC_EOF_T;
+ else
+ fr_eof(fp) = FC_EOF_N;
+
+ (void) lp->tt.frame_send(lp, fp);
+ }
+}
+
+/*
+ * Send BLS Reject.
+ * This is for rejecting BA_ABTS only.
+ */
+static void
+fc_exch_send_ba_rjt(struct fc_frame *rx_fp, enum fc_ba_rjt_reason reason,
+ enum fc_ba_rjt_explan explan)
+{
+ struct fc_frame *fp;
+ struct fc_frame_header *rx_fh;
+ struct fc_frame_header *fh;
+ struct fc_ba_rjt *rp;
+ struct fc_lport *lp;
+ unsigned int f_ctl;
+
+ lp = fr_dev(rx_fp);
+ fp = fc_frame_alloc(lp, sizeof(*rp));
+ if (!fp)
+ return;
+ fh = fc_frame_header_get(fp);
+ rx_fh = fc_frame_header_get(rx_fp);
+
+ memset(fh, 0, sizeof(*fh) + sizeof(*rp));
+
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+ rp->br_reason = reason;
+ rp->br_explan = explan;
+
+ /*
+ * seq_id, cs_ctl, df_ctl and param/offset are zero.
+ */
+ memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
+ memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
+ fh->fh_ox_id = rx_fh->fh_rx_id;
+ fh->fh_rx_id = rx_fh->fh_ox_id;
+ fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
+ fh->fh_r_ctl = FC_RCTL_BA_RJT;
+ fh->fh_type = FC_TYPE_BLS;
+
+ /*
+ * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
+ * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
+ * Bits 9-8 are meaningful (retransmitted or unidirectional).
+ * Last ACK uses bits 7-6 (continue sequence),
+ * bits 5-4 are meaningful (what kind of ACK to use).
+ * Always set LAST_SEQ, END_SEQ.
+ */
+ f_ctl = ntoh24(rx_fh->fh_f_ctl);
+ f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
+ FC_FC_END_CONN | FC_FC_SEQ_INIT |
+ FC_FC_RETX_SEQ | FC_FC_UNI_TX;
+ f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
+ f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ f_ctl &= ~FC_FC_FIRST_SEQ;
+ hton24(fh->fh_f_ctl, f_ctl);
+
+ fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
+ fr_eof(fp) = FC_EOF_T;
+ if (fc_sof_needs_ack(fr_sof(fp)))
+ fr_eof(fp) = FC_EOF_N;
+
+ (void) lp->tt.frame_send(lp, fp);
+}
+
+/*
+ * Handle an incoming ABTS. This would be for target mode usually,
+ * but could be due to lost FCP transfer ready, confirm or RRQ.
+ * We always handle this as an exchange abort, ignoring the parameter.
+ */
+static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
+{
+ struct fc_frame *fp;
+ struct fc_ba_acc *ap;
+ struct fc_frame_header *fh;
+ struct fc_seq *sp;
+
+ if (!ep)
+ goto reject;
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->esb_stat & ESB_ST_COMPLETE) {
+ spin_unlock_bh(&ep->ex_lock);
+ goto reject;
+ }
+ if (!(ep->esb_stat & ESB_ST_REC_QUAL))
+ fc_exch_hold(ep); /* hold for REC_QUAL */
+ ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL;
+ fc_exch_timer_set_locked(ep, ep->r_a_tov);
+
+ fp = fc_frame_alloc(ep->lp, sizeof(*ap));
+ if (!fp) {
+ spin_unlock_bh(&ep->ex_lock);
+ goto free;
+ }
+ fh = fc_frame_header_get(fp);
+ ap = fc_frame_payload_get(fp, sizeof(*ap));
+ memset(ap, 0, sizeof(*ap));
+ sp = &ep->seq;
+ ap->ba_high_seq_cnt = htons(0xffff);
+ if (sp->ssb_stat & SSB_ST_RESP) {
+ ap->ba_seq_id = sp->id;
+ ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
+ ap->ba_high_seq_cnt = fh->fh_seq_cnt;
+ ap->ba_low_seq_cnt = htons(sp->cnt);
+ }
+ sp = fc_seq_start_next(sp);
+ spin_unlock_bh(&ep->ex_lock);
+ fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
+ fc_frame_free(rx_fp);
+ return;
+
+reject:
+ fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
+free:
+ fc_frame_free(rx_fp);
+}
+
+/*
+ * Handle receive where the other end is originating the sequence.
+ */
+static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_seq *sp = NULL;
+ struct fc_exch *ep = NULL;
+ enum fc_sof sof;
+ enum fc_eof eof;
+ u32 f_ctl;
+ enum fc_pf_rjt_reason reject;
+
+ fr_seq(fp) = NULL;
+ reject = fc_seq_lookup_recip(mp, fp);
+ if (reject == FC_RJT_NONE) {
+ sp = fr_seq(fp); /* sequence will be held */
+ ep = fc_seq_exch(sp);
+ sof = fr_sof(fp);
+ eof = fr_eof(fp);
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fc_seq_send_ack(sp, fp);
+
+ /*
+ * Call the receive function.
+ *
+ * The receive function may allocate a new sequence
+ * over the old one, so we shouldn't change the
+ * sequence after this.
+ *
+ * The frame will be freed by the receive function.
+ * If new exch resp handler is valid then call that
+ * first.
+ */
+ if (ep->resp)
+ ep->resp(sp, fp, ep->arg);
+ else
+ lp->tt.lport_recv(lp, sp, fp);
+ fc_exch_release(ep); /* release from lookup */
+ } else {
+ FC_DEBUG_EXCH("exch/seq lookup failed: reject %x\n", reject);
+ fc_frame_free(fp);
+ }
+}
+
+/*
+ * Handle receive where the other end is originating the sequence in
+ * response to our exchange.
+ */
+static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_seq *sp;
+ struct fc_exch *ep;
+ enum fc_sof sof;
+ u32 f_ctl;
+ void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
+ void *ex_resp_arg;
+ int rc;
+
+ ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
+ if (!ep) {
+ atomic_inc(&mp->stats.xid_not_found);
+ goto out;
+ }
+ if (ep->rxid == FC_XID_UNKNOWN)
+ ep->rxid = ntohs(fh->fh_rx_id);
+ if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
+ atomic_inc(&mp->stats.xid_not_found);
+ goto rel;
+ }
+ if (ep->did != ntoh24(fh->fh_s_id) &&
+ ep->did != FC_FID_FLOGI) {
+ atomic_inc(&mp->stats.xid_not_found);
+ goto rel;
+ }
+ sof = fr_sof(fp);
+ if (fc_sof_is_init(sof)) {
+ sp = fc_seq_start_next(&ep->seq);
+ sp->id = fh->fh_seq_id;
+ sp->ssb_stat |= SSB_ST_RESP;
+ } else {
+ sp = &ep->seq;
+ if (sp->id != fh->fh_seq_id) {
+ atomic_inc(&mp->stats.seq_not_found);
+ goto rel;
+ }
+ }
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fr_seq(fp) = sp;
+ if (f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+
+ if (fc_sof_needs_ack(sof))
+ fc_seq_send_ack(sp, fp);
+ resp = ep->resp;
+ ex_resp_arg = ep->arg;
+
+ if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
+ (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
+ (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
+ spin_lock_bh(&ep->ex_lock);
+ rc = fc_exch_done_locked(ep);
+ WARN_ON(fc_seq_exch(sp) != ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+ }
+
+ /*
+ * Call the receive function.
+ * The sequence is held (has a refcnt) for us,
+ * but not for the receive function.
+ *
+ * The receive function may allocate a new sequence
+ * over the old one, so we shouldn't change the
+ * sequence after this.
+ *
+ * The frame will be freed by the receive function.
+ * If new exch resp handler is valid then call that
+ * first.
+ */
+ if (resp)
+ resp(sp, fp, ex_resp_arg);
+ else
+ fc_frame_free(fp);
+ fc_exch_release(ep);
+ return;
+rel:
+ fc_exch_release(ep);
+out:
+ fc_frame_free(fp);
+}
+
+/*
+ * Handle receive for a sequence where other end is responding to our sequence.
+ */
+static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_seq *sp;
+
+ sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */
+ if (!sp) {
+ atomic_inc(&mp->stats.xid_not_found);
+ FC_DEBUG_EXCH("seq lookup failed\n");
+ } else {
+ atomic_inc(&mp->stats.non_bls_resp);
+ FC_DEBUG_EXCH("non-BLS response to sequence");
+ }
+ fc_frame_free(fp);
+}
+
+/*
+ * Handle the response to an ABTS for exchange or sequence.
+ * This can be BA_ACC or BA_RJT.
+ */
+static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
+{
+ void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
+ void *ex_resp_arg;
+ struct fc_frame_header *fh;
+ struct fc_ba_acc *ap;
+ struct fc_seq *sp;
+ u16 low;
+ u16 high;
+ int rc = 1, has_rec = 0;
+
+ fh = fc_frame_header_get(fp);
+ FC_DEBUG_EXCH("exch: BLS rctl %x - %s\n",
+ fh->fh_r_ctl, fc_exch_rctl_name(fh->fh_r_ctl));
+
+ if (cancel_delayed_work_sync(&ep->timeout_work))
+ fc_exch_release(ep); /* release from pending timer hold */
+
+ spin_lock_bh(&ep->ex_lock);
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_BA_ACC:
+ ap = fc_frame_payload_get(fp, sizeof(*ap));
+ if (!ap)
+ break;
+
+ /*
+ * Decide whether to establish a Recovery Qualifier.
+ * We do this if there is a non-empty SEQ_CNT range and
+ * SEQ_ID is the same as the one we aborted.
+ */
+ low = ntohs(ap->ba_low_seq_cnt);
+ high = ntohs(ap->ba_high_seq_cnt);
+ if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
+ (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
+ ap->ba_seq_id == ep->seq_id) && low != high) {
+ ep->esb_stat |= ESB_ST_REC_QUAL;
+ fc_exch_hold(ep); /* hold for recovery qualifier */
+ has_rec = 1;
+ }
+ break;
+ case FC_RCTL_BA_RJT:
+ break;
+ default:
+ break;
+ }
+
+ resp = ep->resp;
+ ex_resp_arg = ep->arg;
+
+ /* do we need to do some other checks here. Can we reuse more of
+ * fc_exch_recv_seq_resp
+ */
+ sp = &ep->seq;
+ /*
+ * do we want to check END_SEQ as well as LAST_SEQ here?
+ */
+ if (ep->fh_type != FC_TYPE_FCP &&
+ ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+
+ if (resp)
+ resp(sp, fp, ex_resp_arg);
+ else
+ fc_frame_free(fp);
+
+ if (has_rec)
+ fc_exch_timer_set(ep, ep->r_a_tov);
+
+}
+
+/*
+ * Receive BLS sequence.
+ * This is always a sequence initiated by the remote side.
+ * We may be either the originator or recipient of the exchange.
+ */
+static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fc_exch *ep;
+ u32 f_ctl;
+
+ fh = fc_frame_header_get(fp);
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fr_seq(fp) = NULL;
+
+ ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
+ ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
+ if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
+ spin_lock_bh(&ep->ex_lock);
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+ spin_unlock_bh(&ep->ex_lock);
+ }
+ if (f_ctl & FC_FC_SEQ_CTX) {
+ /*
+ * A response to a sequence we initiated.
+ * This should only be ACKs for class 2 or F.
+ */
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_ACK_1:
+ case FC_RCTL_ACK_0:
+ break;
+ default:
+ FC_DEBUG_EXCH("BLS rctl %x - %s received",
+ fh->fh_r_ctl,
+ fc_exch_rctl_name(fh->fh_r_ctl));
+ break;
+ }
+ fc_frame_free(fp);
+ } else {
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_BA_RJT:
+ case FC_RCTL_BA_ACC:
+ if (ep)
+ fc_exch_abts_resp(ep, fp);
+ else
+ fc_frame_free(fp);
+ break;
+ case FC_RCTL_BA_ABTS:
+ fc_exch_recv_abts(ep, fp);
+ break;
+ default: /* ignore junk */
+ fc_frame_free(fp);
+ break;
+ }
+ }
+ if (ep)
+ fc_exch_release(ep); /* release hold taken by fc_exch_find */
+}
+
+/*
+ * Accept sequence with LS_ACC.
+ * If this fails due to allocation or transmit congestion, assume the
+ * originator will repeat the sequence.
+ */
+static void fc_seq_ls_acc(struct fc_seq *req_sp)
+{
+ struct fc_seq *sp;
+ struct fc_els_ls_acc *acc;
+ struct fc_frame *fp;
+
+ sp = fc_seq_start_next(req_sp);
+ fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc));
+ if (fp) {
+ acc = fc_frame_payload_get(fp, sizeof(*acc));
+ memset(acc, 0, sizeof(*acc));
+ acc->la_cmd = ELS_LS_ACC;
+ fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ }
+}
+
+/*
+ * Reject sequence with ELS LS_RJT.
+ * If this fails due to allocation or transmit congestion, assume the
+ * originator will repeat the sequence.
+ */
+static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason,
+ enum fc_els_rjt_explan explan)
+{
+ struct fc_seq *sp;
+ struct fc_els_ls_rjt *rjt;
+ struct fc_frame *fp;
+
+ sp = fc_seq_start_next(req_sp);
+ fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*rjt));
+ if (fp) {
+ rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+ memset(rjt, 0, sizeof(*rjt));
+ rjt->er_cmd = ELS_LS_RJT;
+ rjt->er_reason = reason;
+ rjt->er_explan = explan;
+ fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ }
+}
+
+static void fc_exch_reset(struct fc_exch *ep)
+{
+ struct fc_seq *sp;
+ void (*resp)(struct fc_seq *, struct fc_frame *, void *);
+ void *arg;
+ int rc = 1;
+
+ spin_lock_bh(&ep->ex_lock);
+ ep->state |= FC_EX_RST_CLEANUP;
+ /*
+ * we really want to call del_timer_sync, but cannot due
+ * to the lport calling with the lport lock held (some resp
+ * functions can also grab the lport lock which could cause
+ * a deadlock).
+ */
+ if (cancel_delayed_work(&ep->timeout_work))
+ atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
+ resp = ep->resp;
+ ep->resp = NULL;
+ if (ep->esb_stat & ESB_ST_REC_QUAL)
+ atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */
+ ep->esb_stat &= ~ESB_ST_REC_QUAL;
+ arg = ep->arg;
+ sp = &ep->seq;
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+
+ if (resp)
+ resp(sp, ERR_PTR(-FC_EX_CLOSED), arg);
+}
+
+/*
+ * Reset an exchange manager, releasing all sequences and exchanges.
+ * If sid is non-zero, reset only exchanges we source from that FID.
+ * If did is non-zero, reset only exchanges destined to that FID.
+ */
+void fc_exch_mgr_reset(struct fc_exch_mgr *mp, u32 sid, u32 did)
+{
+ struct fc_exch *ep;
+ struct fc_exch *next;
+
+ spin_lock_bh(&mp->em_lock);
+restart:
+ list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) {
+ if ((sid == 0 || sid == ep->sid) &&
+ (did == 0 || did == ep->did)) {
+ fc_exch_hold(ep);
+ spin_unlock_bh(&mp->em_lock);
+
+ fc_exch_reset(ep);
+
+ fc_exch_release(ep);
+ spin_lock_bh(&mp->em_lock);
+
+ /*
+ * must restart loop incase while lock was down
+ * multiple eps were released.
+ */
+ goto restart;
+ }
+ }
+ spin_unlock_bh(&mp->em_lock);
+}
+EXPORT_SYMBOL(fc_exch_mgr_reset);
+
+/*
+ * Handle incoming ELS REC - Read Exchange Concise.
+ * Note that the requesting port may be different than the S_ID in the request.
+ */
+static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp)
+{
+ struct fc_frame *fp;
+ struct fc_exch *ep;
+ struct fc_exch_mgr *em;
+ struct fc_els_rec *rp;
+ struct fc_els_rec_acc *acc;
+ enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
+ enum fc_els_rjt_explan explan;
+ u32 sid;
+ u16 rxid;
+ u16 oxid;
+
+ rp = fc_frame_payload_get(rfp, sizeof(*rp));
+ explan = ELS_EXPL_INV_LEN;
+ if (!rp)
+ goto reject;
+ sid = ntoh24(rp->rec_s_id);
+ rxid = ntohs(rp->rec_rx_id);
+ oxid = ntohs(rp->rec_ox_id);
+
+ /*
+ * Currently it's hard to find the local S_ID from the exchange
+ * manager. This will eventually be fixed, but for now it's easier
+ * to lookup the subject exchange twice, once as if we were
+ * the initiator, and then again if we weren't.
+ */
+ em = fc_seq_exch(sp)->em;
+ ep = fc_exch_find(em, oxid);
+ explan = ELS_EXPL_OXID_RXID;
+ if (ep && ep->oid == sid) {
+ if (ep->rxid != FC_XID_UNKNOWN &&
+ rxid != FC_XID_UNKNOWN &&
+ ep->rxid != rxid)
+ goto rel;
+ } else {
+ if (ep)
+ fc_exch_release(ep);
+ ep = NULL;
+ if (rxid != FC_XID_UNKNOWN)
+ ep = fc_exch_find(em, rxid);
+ if (!ep)
+ goto reject;
+ }
+
+ fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc));
+ if (!fp) {
+ fc_exch_done(sp);
+ goto out;
+ }
+ sp = fc_seq_start_next(sp);
+ acc = fc_frame_payload_get(fp, sizeof(*acc));
+ memset(acc, 0, sizeof(*acc));
+ acc->reca_cmd = ELS_LS_ACC;
+ acc->reca_ox_id = rp->rec_ox_id;
+ memcpy(acc->reca_ofid, rp->rec_s_id, 3);
+ acc->reca_rx_id = htons(ep->rxid);
+ if (ep->sid == ep->oid)
+ hton24(acc->reca_rfid, ep->did);
+ else
+ hton24(acc->reca_rfid, ep->sid);
+ acc->reca_fc4value = htonl(ep->seq.rec_data);
+ acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
+ ESB_ST_SEQ_INIT |
+ ESB_ST_COMPLETE));
+ sp = fc_seq_start_next(sp);
+ fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+out:
+ fc_exch_release(ep);
+ fc_frame_free(rfp);
+ return;
+
+rel:
+ fc_exch_release(ep);
+reject:
+ fc_seq_ls_rjt(sp, reason, explan);
+ fc_frame_free(rfp);
+}
+
+/*
+ * Handle response from RRQ.
+ * Not much to do here, really.
+ * Should report errors.
+ *
+ * TODO: fix error handler.
+ */
+static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct fc_exch *aborted_ep = arg;
+ unsigned int op;
+
+ if (IS_ERR(fp)) {
+ int err = PTR_ERR(fp);
+
+ if (err == -FC_EX_CLOSED)
+ goto cleanup;
+ FC_DBG("Cannot process RRQ, because of frame error %d\n", err);
+ return;
+ }
+
+ op = fc_frame_payload_op(fp);
+ fc_frame_free(fp);
+
+ switch (op) {
+ case ELS_LS_RJT:
+ FC_DBG("LS_RJT for RRQ");
+ /* fall through */
+ case ELS_LS_ACC:
+ goto cleanup;
+ default:
+ FC_DBG("unexpected response op %x for RRQ", op);
+ return;
+ }
+
+cleanup:
+ fc_exch_done(&aborted_ep->seq);
+ /* drop hold for rec qual */
+ fc_exch_release(aborted_ep);
+}
+
+/*
+ * Send ELS RRQ - Reinstate Recovery Qualifier.
+ * This tells the remote port to stop blocking the use of
+ * the exchange and the seq_cnt range.
+ */
+static void fc_exch_rrq(struct fc_exch *ep)
+{
+ struct fc_lport *lp;
+ struct fc_els_rrq *rrq;
+ struct fc_frame *fp;
+ struct fc_seq *rrq_sp;
+ u32 did;
+
+ lp = ep->lp;
+
+ fp = fc_frame_alloc(lp, sizeof(*rrq));
+ if (!fp)
+ return;
+ rrq = fc_frame_payload_get(fp, sizeof(*rrq));
+ memset(rrq, 0, sizeof(*rrq));
+ rrq->rrq_cmd = ELS_RRQ;
+ hton24(rrq->rrq_s_id, ep->sid);
+ rrq->rrq_ox_id = htons(ep->oxid);
+ rrq->rrq_rx_id = htons(ep->rxid);
+
+ did = ep->did;
+ if (ep->esb_stat & ESB_ST_RESP)
+ did = ep->sid;
+
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did,
+ fc_host_port_id(lp->host), FC_TYPE_ELS,
+ FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+
+ rrq_sp = fc_exch_seq_send(lp, fp, fc_exch_rrq_resp, NULL, ep,
+ lp->e_d_tov);
+ if (!rrq_sp) {
+ ep->esb_stat |= ESB_ST_REC_QUAL;
+ fc_exch_timer_set_locked(ep, ep->r_a_tov);
+ return;
+ }
+}
+
+
+/*
+ * Handle incoming ELS RRQ - Reset Recovery Qualifier.
+ */
+static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp)
+{
+ struct fc_exch *ep; /* request or subject exchange */
+ struct fc_els_rrq *rp;
+ u32 sid;
+ u16 xid;
+ enum fc_els_rjt_explan explan;
+
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+ explan = ELS_EXPL_INV_LEN;
+ if (!rp)
+ goto reject;
+
+ /*
+ * lookup subject exchange.
+ */
+ ep = fc_seq_exch(sp);
+ sid = ntoh24(rp->rrq_s_id); /* subject source */
+ xid = ep->did == sid ? ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
+ ep = fc_exch_find(ep->em, xid);
+
+ explan = ELS_EXPL_OXID_RXID;
+ if (!ep)
+ goto reject;
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->oxid != ntohs(rp->rrq_ox_id))
+ goto unlock_reject;
+ if (ep->rxid != ntohs(rp->rrq_rx_id) &&
+ ep->rxid != FC_XID_UNKNOWN)
+ goto unlock_reject;
+ explan = ELS_EXPL_SID;
+ if (ep->sid != sid)
+ goto unlock_reject;
+
+ /*
+ * Clear Recovery Qualifier state, and cancel timer if complete.
+ */
+ if (ep->esb_stat & ESB_ST_REC_QUAL) {
+ ep->esb_stat &= ~ESB_ST_REC_QUAL;
+ atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */
+ }
+ if (ep->esb_stat & ESB_ST_COMPLETE) {
+ if (cancel_delayed_work(&ep->timeout_work))
+ atomic_dec(&ep->ex_refcnt); /* drop timer hold */
+ }
+
+ spin_unlock_bh(&ep->ex_lock);
+
+ /*
+ * Send LS_ACC.
+ */
+ fc_seq_ls_acc(sp);
+ fc_frame_free(fp);
+ return;
+
+unlock_reject:
+ spin_unlock_bh(&ep->ex_lock);
+ fc_exch_release(ep); /* drop hold from fc_exch_find */
+reject:
+ fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan);
+ fc_frame_free(fp);
+}
+
+struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
+ enum fc_class class,
+ u16 min_xid, u16 max_xid)
+{
+ struct fc_exch_mgr *mp;
+ size_t len;
+
+ if (max_xid <= min_xid || min_xid == 0 || max_xid == FC_XID_UNKNOWN) {
+ FC_DBG("Invalid min_xid 0x:%x and max_xid 0x:%x\n",
+ min_xid, max_xid);
+ return NULL;
+ }
+
+ /*
+ * Memory need for EM
+ */
+#define xid_ok(i, m1, m2) (((i) >= (m1)) && ((i) <= (m2)))
+ len = (max_xid - min_xid + 1) * (sizeof(struct fc_exch *));
+ len += sizeof(struct fc_exch_mgr);
+
+ mp = kzalloc(len, GFP_ATOMIC);
+ if (!mp)
+ return NULL;
+
+ mp->class = class;
+ mp->total_exches = 0;
+ mp->exches = (struct fc_exch **)(mp + 1);
+ mp->lp = lp;
+ /* adjust em exch xid range for offload */
+ mp->min_xid = min_xid;
+ mp->max_xid = max_xid;
+ mp->last_xid = min_xid - 1;
+ mp->max_read = 0;
+ mp->last_read = 0;
+ if (lp->lro_enabled && xid_ok(lp->lro_xid, min_xid, max_xid)) {
+ mp->max_read = lp->lro_xid;
+ mp->last_read = min_xid - 1;
+ mp->last_xid = mp->max_read;
+ } else {
+ /* disable lro if no xid control over read */
+ lp->lro_enabled = 0;
+ }
+
+ INIT_LIST_HEAD(&mp->ex_list);
+ spin_lock_init(&mp->em_lock);
+
+ mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
+ if (!mp->ep_pool)
+ goto free_mp;
+
+ return mp;
+
+free_mp:
+ kfree(mp);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_exch_mgr_alloc);
+
+void fc_exch_mgr_free(struct fc_exch_mgr *mp)
+{
+ WARN_ON(!mp);
+ /*
+ * The total exch count must be zero
+ * before freeing exchange manager.
+ */
+ WARN_ON(mp->total_exches != 0);
+ mempool_destroy(mp->ep_pool);
+ kfree(mp);
+}
+EXPORT_SYMBOL(fc_exch_mgr_free);
+
+struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp)
+{
+ if (!lp || !lp->emp)
+ return NULL;
+
+ return fc_exch_alloc(lp->emp, fp, 0);
+}
+EXPORT_SYMBOL(fc_exch_get);
+
+struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
+ struct fc_frame *fp,
+ void (*resp)(struct fc_seq *,
+ struct fc_frame *fp,
+ void *arg),
+ void (*destructor)(struct fc_seq *, void *),
+ void *arg, u32 timer_msec)
+{
+ struct fc_exch *ep;
+ struct fc_seq *sp = NULL;
+ struct fc_frame_header *fh;
+ int rc = 1;
+
+ ep = lp->tt.exch_get(lp, fp);
+ if (!ep) {
+ fc_frame_free(fp);
+ return NULL;
+ }
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+ fh = fc_frame_header_get(fp);
+ fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id));
+ ep->resp = resp;
+ ep->destructor = destructor;
+ ep->arg = arg;
+ ep->r_a_tov = FC_DEF_R_A_TOV;
+ ep->lp = lp;
+ sp = &ep->seq;
+
+ ep->fh_type = fh->fh_type; /* save for possbile timeout handling */
+ ep->f_ctl = ntoh24(fh->fh_f_ctl);
+ fc_exch_setup_hdr(ep, fp, ep->f_ctl);
+ sp->cnt++;
+
+ if (unlikely(lp->tt.frame_send(lp, fp)))
+ goto err;
+
+ if (timer_msec)
+ fc_exch_timer_set_locked(ep, timer_msec);
+ ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
+
+ if (ep->f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat &= ~ESB_ST_SEQ_INIT;
+ spin_unlock_bh(&ep->ex_lock);
+ return sp;
+err:
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_exch_seq_send);
+
+/*
+ * Receive a frame
+ */
+void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ u32 f_ctl;
+
+ /* lport lock ? */
+ if (!lp || !mp || (lp->state == LPORT_ST_NONE)) {
+ FC_DBG("fc_lport or EM is not allocated and configured");
+ fc_frame_free(fp);
+ return;
+ }
+
+ /*
+ * If frame is marked invalid, just drop it.
+ */
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ switch (fr_eof(fp)) {
+ case FC_EOF_T:
+ if (f_ctl & FC_FC_END_SEQ)
+ skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
+ /* fall through */
+ case FC_EOF_N:
+ if (fh->fh_type == FC_TYPE_BLS)
+ fc_exch_recv_bls(mp, fp);
+ else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
+ FC_FC_EX_CTX)
+ fc_exch_recv_seq_resp(mp, fp);
+ else if (f_ctl & FC_FC_SEQ_CTX)
+ fc_exch_recv_resp(mp, fp);
+ else
+ fc_exch_recv_req(lp, mp, fp);
+ break;
+ default:
+ FC_DBG("dropping invalid frame (eof %x)", fr_eof(fp));
+ fc_frame_free(fp);
+ break;
+ }
+}
+EXPORT_SYMBOL(fc_exch_recv);
+
+int fc_exch_init(struct fc_lport *lp)
+{
+ if (!lp->tt.exch_get) {
+ /*
+ * exch_put() should be NULL if
+ * exch_get() is NULL
+ */
+ WARN_ON(lp->tt.exch_put);
+ lp->tt.exch_get = fc_exch_get;
+ }
+
+ if (!lp->tt.seq_start_next)
+ lp->tt.seq_start_next = fc_seq_start_next;
+
+ if (!lp->tt.exch_seq_send)
+ lp->tt.exch_seq_send = fc_exch_seq_send;
+
+ if (!lp->tt.seq_send)
+ lp->tt.seq_send = fc_seq_send;
+
+ if (!lp->tt.seq_els_rsp_send)
+ lp->tt.seq_els_rsp_send = fc_seq_els_rsp_send;
+
+ if (!lp->tt.exch_done)
+ lp->tt.exch_done = fc_exch_done;
+
+ if (!lp->tt.exch_mgr_reset)
+ lp->tt.exch_mgr_reset = fc_exch_mgr_reset;
+
+ if (!lp->tt.seq_exch_abort)
+ lp->tt.seq_exch_abort = fc_seq_exch_abort;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_exch_init);
+
+int fc_setup_exch_mgr(void)
+{
+ fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!fc_em_cachep)
+ return -ENOMEM;
+ return 0;
+}
+
+void fc_destroy_exch_mgr(void)
+{
+ kmem_cache_destroy(fc_em_cachep);
+}
--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
+ * Copyright(c) 2008 Mike Christie
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/scatterlist.h>
+#include <linux/err.h>
+#include <linux/crc32.h>
+
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <scsi/fc/fc_fc2.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+MODULE_AUTHOR("Open-FCoE.org");
+MODULE_DESCRIPTION("libfc");
+MODULE_LICENSE("GPL");
+
+static int fc_fcp_debug;
+
+#define FC_DEBUG_FCP(fmt...) \
+ do { \
+ if (fc_fcp_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static struct kmem_cache *scsi_pkt_cachep;
+
+/* SRB state definitions */
+#define FC_SRB_FREE 0 /* cmd is free */
+#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
+#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
+#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
+#define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
+#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
+#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
+#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
+#define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */
+
+#define FC_SRB_READ (1 << 1)
+#define FC_SRB_WRITE (1 << 0)
+
+/*
+ * The SCp.ptr should be tested and set under the host lock. NULL indicates
+ * that the command has been retruned to the scsi layer.
+ */
+#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
+#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
+#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
+#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
+#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
+
+struct fc_fcp_internal {
+ mempool_t *scsi_pkt_pool;
+ struct list_head scsi_pkt_queue;
+ u8 throttled;
+};
+
+#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
+
+/*
+ * function prototypes
+ * FC scsi I/O related functions
+ */
+static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
+static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp);
+static void fc_timeout_error(struct fc_fcp_pkt *);
+static void fc_fcp_timeout(unsigned long data);
+static void fc_fcp_rec(struct fc_fcp_pkt *);
+static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
+static void fc_io_compl(struct fc_fcp_pkt *);
+
+static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
+static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
+
+/*
+ * command status codes
+ */
+#define FC_COMPLETE 0
+#define FC_CMD_ABORTED 1
+#define FC_CMD_RESET 2
+#define FC_CMD_PLOGO 3
+#define FC_SNS_RCV 4
+#define FC_TRANS_ERR 5
+#define FC_DATA_OVRRUN 6
+#define FC_DATA_UNDRUN 7
+#define FC_ERROR 8
+#define FC_HRD_ERROR 9
+#define FC_CMD_TIME_OUT 10
+
+/*
+ * Error recovery timeout values.
+ */
+#define FC_SCSI_ER_TIMEOUT (10 * HZ)
+#define FC_SCSI_TM_TOV (10 * HZ)
+#define FC_SCSI_REC_TOV (2 * HZ)
+#define FC_HOST_RESET_TIMEOUT (30 * HZ)
+
+#define FC_MAX_ERROR_CNT 5
+#define FC_MAX_RECOV_RETRY 3
+
+#define FC_FCP_DFLT_QUEUE_DEPTH 32
+
+/**
+ * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet
+ * @lp: fc lport struct
+ * @gfp: gfp flags for allocation
+ *
+ * This is used by upper layer scsi driver.
+ * Return Value : scsi_pkt structure or null on allocation failure.
+ * Context : call from process context. no locking required.
+ */
+static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_pkt *fsp;
+
+ fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
+ if (fsp) {
+ memset(fsp, 0, sizeof(*fsp));
+ fsp->lp = lp;
+ atomic_set(&fsp->ref_cnt, 1);
+ init_timer(&fsp->timer);
+ INIT_LIST_HEAD(&fsp->list);
+ spin_lock_init(&fsp->scsi_pkt_lock);
+ }
+ return fsp;
+}
+
+/**
+ * fc_fcp_pkt_release - release hold on scsi_pkt packet
+ * @fsp: fcp packet struct
+ *
+ * This is used by upper layer scsi driver.
+ * Context : call from process and interrupt context.
+ * no locking required
+ */
+static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
+{
+ if (atomic_dec_and_test(&fsp->ref_cnt)) {
+ struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
+
+ mempool_free(fsp, si->scsi_pkt_pool);
+ }
+}
+
+static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
+{
+ atomic_inc(&fsp->ref_cnt);
+}
+
+/**
+ * fc_fcp_pkt_destory - release hold on scsi_pkt packet
+ *
+ * @seq: exchange sequence
+ * @fsp: fcp packet struct
+ *
+ * Release hold on scsi_pkt packet set to keep scsi_pkt
+ * till EM layer exch resource is not freed.
+ * Context : called from from EM layer.
+ * no locking required
+ */
+static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
+{
+ fc_fcp_pkt_release(fsp);
+}
+
+/**
+ * fc_fcp_lock_pkt - lock a packet and get a ref to it.
+ * @fsp: fcp packet
+ *
+ * We should only return error if we return a command to scsi-ml before
+ * getting a response. This can happen in cases where we send a abort, but
+ * do not wait for the response and the abort and command can be passing
+ * each other on the wire/network-layer.
+ *
+ * Note: this function locks the packet and gets a reference to allow
+ * callers to call the completion function while the lock is held and
+ * not have to worry about the packets refcount.
+ *
+ * TODO: Maybe we should just have callers grab/release the lock and
+ * have a function that they call to verify the fsp and grab a ref if
+ * needed.
+ */
+static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
+{
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (fsp->state & FC_SRB_COMPL) {
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ return -EPERM;
+ }
+
+ fc_fcp_pkt_hold(fsp);
+ return 0;
+}
+
+static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
+{
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ fc_fcp_pkt_release(fsp);
+}
+
+static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
+{
+ if (!(fsp->state & FC_SRB_COMPL))
+ mod_timer(&fsp->timer, jiffies + delay);
+}
+
+static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
+{
+ if (!fsp->seq_ptr)
+ return -EINVAL;
+
+ fsp->state |= FC_SRB_ABORT_PENDING;
+ return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
+}
+
+/*
+ * Retry command.
+ * An abort isn't needed.
+ */
+static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
+{
+ if (fsp->seq_ptr) {
+ fsp->lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+ fsp->io_status = SUGGEST_RETRY << 24;
+ fsp->status_code = FC_ERROR;
+ fc_fcp_complete_locked(fsp);
+}
+
+/*
+ * Receive SCSI data from target.
+ * Called after receiving solicited data.
+ */
+static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ struct scsi_cmnd *sc = fsp->cmd;
+ struct fc_lport *lp = fsp->lp;
+ struct fcoe_dev_stats *stats;
+ struct fc_frame_header *fh;
+ size_t start_offset;
+ size_t offset;
+ u32 crc;
+ u32 copy_len = 0;
+ size_t len;
+ void *buf;
+ struct scatterlist *sg;
+ size_t remaining;
+
+ fh = fc_frame_header_get(fp);
+ offset = ntohl(fh->fh_parm_offset);
+ start_offset = offset;
+ len = fr_len(fp) - sizeof(*fh);
+ buf = fc_frame_payload_get(fp, 0);
+
+ if (offset + len > fsp->data_len) {
+ /*
+ * this should never happen
+ */
+ if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
+ fc_frame_crc_check(fp))
+ goto crc_err;
+ FC_DEBUG_FCP("data received past end. len %zx offset %zx "
+ "data_len %x\n", len, offset, fsp->data_len);
+ fc_fcp_retry_cmd(fsp);
+ return;
+ }
+ if (offset != fsp->xfer_len)
+ fsp->state |= FC_SRB_DISCONTIG;
+
+ crc = 0;
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
+ crc = crc32(~0, (u8 *) fh, sizeof(*fh));
+
+ sg = scsi_sglist(sc);
+ remaining = len;
+
+ while (remaining > 0 && sg) {
+ size_t off;
+ void *page_addr;
+ size_t sg_bytes;
+
+ if (offset >= sg->length) {
+ offset -= sg->length;
+ sg = sg_next(sg);
+ continue;
+ }
+ sg_bytes = min(remaining, sg->length - offset);
+
+ /*
+ * The scatterlist item may be bigger than PAGE_SIZE,
+ * but we are limited to mapping PAGE_SIZE at a time.
+ */
+ off = offset + sg->offset;
+ sg_bytes = min(sg_bytes, (size_t)
+ (PAGE_SIZE - (off & ~PAGE_MASK)));
+ page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
+ KM_SOFTIRQ0);
+ if (!page_addr)
+ break; /* XXX panic? */
+
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
+ crc = crc32(crc, buf, sg_bytes);
+ memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
+ sg_bytes);
+
+ kunmap_atomic(page_addr, KM_SOFTIRQ0);
+ buf += sg_bytes;
+ offset += sg_bytes;
+ remaining -= sg_bytes;
+ copy_len += sg_bytes;
+ }
+
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
+ buf = fc_frame_payload_get(fp, 0);
+ if (len % 4) {
+ crc = crc32(crc, buf + len, 4 - (len % 4));
+ len += 4 - (len % 4);
+ }
+
+ if (~crc != le32_to_cpu(fr_crc(fp))) {
+crc_err:
+ stats = lp->dev_stats[smp_processor_id()];
+ stats->ErrorFrames++;
+ if (stats->InvalidCRCCount++ < 5)
+ FC_DBG("CRC error on data frame\n");
+ /*
+ * Assume the frame is total garbage.
+ * We may have copied it over the good part
+ * of the buffer.
+ * If so, we need to retry the entire operation.
+ * Otherwise, ignore it.
+ */
+ if (fsp->state & FC_SRB_DISCONTIG)
+ fc_fcp_retry_cmd(fsp);
+ return;
+ }
+ }
+
+ if (fsp->xfer_contig_end == start_offset)
+ fsp->xfer_contig_end += copy_len;
+ fsp->xfer_len += copy_len;
+
+ /*
+ * In the very rare event that this data arrived after the response
+ * and completes the transfer, call the completion handler.
+ */
+ if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
+ fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
+ fc_fcp_complete_locked(fsp);
+}
+
+/*
+ * fc_fcp_send_data - Send SCSI data to target.
+ * @fsp: ptr to fc_fcp_pkt
+ * @sp: ptr to this sequence
+ * @offset: starting offset for this data request
+ * @seq_blen: the burst length for this data request
+ *
+ * Called after receiving a Transfer Ready data descriptor.
+ * if LLD is capable of seq offload then send down seq_blen
+ * size of data in single frame, otherwise send multiple FC
+ * frames of max FC frame payload supported by target port.
+ *
+ * Returns : 0 for success.
+ */
+static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
+ size_t offset, size_t seq_blen)
+{
+ struct fc_exch *ep;
+ struct scsi_cmnd *sc;
+ struct scatterlist *sg;
+ struct fc_frame *fp = NULL;
+ struct fc_lport *lp = fsp->lp;
+ size_t remaining;
+ size_t t_blen;
+ size_t tlen;
+ size_t sg_bytes;
+ size_t frame_offset, fh_parm_offset;
+ int error;
+ void *data = NULL;
+ void *page_addr;
+ int using_sg = lp->sg_supp;
+ u32 f_ctl;
+
+ WARN_ON(seq_blen <= 0);
+ if (unlikely(offset + seq_blen > fsp->data_len)) {
+ /* this should never happen */
+ FC_DEBUG_FCP("xfer-ready past end. seq_blen %zx offset %zx\n",
+ seq_blen, offset);
+ fc_fcp_send_abort(fsp);
+ return 0;
+ } else if (offset != fsp->xfer_len) {
+ /* Out of Order Data Request - no problem, but unexpected. */
+ FC_DEBUG_FCP("xfer-ready non-contiguous. "
+ "seq_blen %zx offset %zx\n", seq_blen, offset);
+ }
+
+ /*
+ * if LLD is capable of seq_offload then set transport
+ * burst length (t_blen) to seq_blen, otherwise set t_blen
+ * to max FC frame payload previously set in fsp->max_payload.
+ */
+ t_blen = lp->seq_offload ? seq_blen : fsp->max_payload;
+ WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
+ if (t_blen > 512)
+ t_blen &= ~(512 - 1); /* round down to block size */
+ WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
+ sc = fsp->cmd;
+
+ remaining = seq_blen;
+ fh_parm_offset = frame_offset = offset;
+ tlen = 0;
+ seq = lp->tt.seq_start_next(seq);
+ f_ctl = FC_FC_REL_OFF;
+ WARN_ON(!seq);
+
+ /*
+ * If a get_page()/put_page() will fail, don't use sg lists
+ * in the fc_frame structure.
+ *
+ * The put_page() may be long after the I/O has completed
+ * in the case of FCoE, since the network driver does it
+ * via free_skb(). See the test in free_pages_check().
+ *
+ * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'.
+ */
+ if (using_sg) {
+ for (sg = scsi_sglist(sc); sg; sg = sg_next(sg)) {
+ if (page_count(sg_page(sg)) == 0 ||
+ (sg_page(sg)->flags & (1 << PG_lru |
+ 1 << PG_private |
+ 1 << PG_locked |
+ 1 << PG_active |
+ 1 << PG_slab |
+ 1 << PG_swapcache |
+ 1 << PG_writeback |
+ 1 << PG_reserved |
+ 1 << PG_buddy))) {
+ using_sg = 0;
+ break;
+ }
+ }
+ }
+ sg = scsi_sglist(sc);
+
+ while (remaining > 0 && sg) {
+ if (offset >= sg->length) {
+ offset -= sg->length;
+ sg = sg_next(sg);
+ continue;
+ }
+ if (!fp) {
+ tlen = min(t_blen, remaining);
+
+ /*
+ * TODO. Temporary workaround. fc_seq_send() can't
+ * handle odd lengths in non-linear skbs.
+ * This will be the final fragment only.
+ */
+ if (tlen % 4)
+ using_sg = 0;
+ if (using_sg) {
+ fp = _fc_frame_alloc(lp, 0);
+ if (!fp)
+ return -ENOMEM;
+ } else {
+ fp = fc_frame_alloc(lp, tlen);
+ if (!fp)
+ return -ENOMEM;
+
+ data = (void *)(fr_hdr(fp)) +
+ sizeof(struct fc_frame_header);
+ }
+ fh_parm_offset = frame_offset;
+ fr_max_payload(fp) = fsp->max_payload;
+ }
+ sg_bytes = min(tlen, sg->length - offset);
+ if (using_sg) {
+ WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags >
+ FC_FRAME_SG_LEN);
+ get_page(sg_page(sg));
+ skb_fill_page_desc(fp_skb(fp),
+ skb_shinfo(fp_skb(fp))->nr_frags,
+ sg_page(sg), sg->offset + offset,
+ sg_bytes);
+ fp_skb(fp)->data_len += sg_bytes;
+ fr_len(fp) += sg_bytes;
+ fp_skb(fp)->truesize += PAGE_SIZE;
+ } else {
+ size_t off = offset + sg->offset;
+
+ /*
+ * The scatterlist item may be bigger than PAGE_SIZE,
+ * but we must not cross pages inside the kmap.
+ */
+ sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
+ (off & ~PAGE_MASK)));
+ page_addr = kmap_atomic(sg_page(sg) +
+ (off >> PAGE_SHIFT),
+ KM_SOFTIRQ0);
+ memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
+ sg_bytes);
+ kunmap_atomic(page_addr, KM_SOFTIRQ0);
+ data += sg_bytes;
+ }
+ offset += sg_bytes;
+ frame_offset += sg_bytes;
+ tlen -= sg_bytes;
+ remaining -= sg_bytes;
+
+ if (tlen)
+ continue;
+
+ /*
+ * Send sequence with transfer sequence initiative in case
+ * this is last FCP frame of the sequence.
+ */
+ if (remaining == 0)
+ f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
+
+ ep = fc_seq_exch(seq);
+ fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
+ FC_TYPE_FCP, f_ctl, fh_parm_offset);
+
+ /*
+ * send fragment using for a sequence.
+ */
+ error = lp->tt.seq_send(lp, seq, fp);
+ if (error) {
+ WARN_ON(1); /* send error should be rare */
+ fc_fcp_retry_cmd(fsp);
+ return 0;
+ }
+ fp = NULL;
+ }
+ fsp->xfer_len += seq_blen; /* premature count? */
+ return 0;
+}
+
+static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ int ba_done = 1;
+ struct fc_ba_rjt *brp;
+ struct fc_frame_header *fh;
+
+ fh = fc_frame_header_get(fp);
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_BA_ACC:
+ break;
+ case FC_RCTL_BA_RJT:
+ brp = fc_frame_payload_get(fp, sizeof(*brp));
+ if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
+ break;
+ /* fall thru */
+ default:
+ /*
+ * we will let the command timeout
+ * and scsi-ml recover in this case,
+ * therefore cleared the ba_done flag.
+ */
+ ba_done = 0;
+ }
+
+ if (ba_done) {
+ fsp->state |= FC_SRB_ABORTED;
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+
+ if (fsp->wait_for_comp)
+ complete(&fsp->tm_done);
+ else
+ fc_fcp_complete_locked(fsp);
+ }
+}
+
+/*
+ * fc_fcp_reduce_can_queue - drop can_queue
+ * @lp: lport to drop queueing for
+ *
+ * If we are getting memory allocation failures, then we may
+ * be trying to execute too many commands. We let the running
+ * commands complete or timeout, then try again with a reduced
+ * can_queue. Eventually we will hit the point where we run
+ * on all reserved structs.
+ */
+static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ unsigned long flags;
+ int can_queue;
+
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ if (si->throttled)
+ goto done;
+ si->throttled = 1;
+
+ can_queue = lp->host->can_queue;
+ can_queue >>= 1;
+ if (!can_queue)
+ can_queue = 1;
+ lp->host->can_queue = can_queue;
+ shost_printk(KERN_ERR, lp->host, "Could not allocate frame.\n"
+ "Reducing can_queue to %d.\n", can_queue);
+done:
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+}
+
+/*
+ * exch mgr calls this routine to process scsi
+ * exchanges.
+ *
+ * Return : None
+ * Context : called from Soft IRQ context
+ * can not called holding list lock
+ */
+static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
+ struct fc_lport *lp;
+ struct fc_frame_header *fh;
+ struct fcp_txrdy *dd;
+ u8 r_ctl;
+ int rc = 0;
+
+ if (IS_ERR(fp))
+ goto errout;
+
+ fh = fc_frame_header_get(fp);
+ r_ctl = fh->fh_r_ctl;
+ lp = fsp->lp;
+
+ if (!(lp->state & LPORT_ST_READY))
+ goto out;
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+ fsp->last_pkt_time = jiffies;
+
+ if (fh->fh_type == FC_TYPE_BLS) {
+ fc_fcp_abts_resp(fsp, fp);
+ goto unlock;
+ }
+
+ if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
+ goto unlock;
+
+ if (r_ctl == FC_RCTL_DD_DATA_DESC) {
+ /*
+ * received XFER RDY from the target
+ * need to send data to the target
+ */
+ WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
+ dd = fc_frame_payload_get(fp, sizeof(*dd));
+ WARN_ON(!dd);
+
+ rc = fc_fcp_send_data(fsp, seq,
+ (size_t) ntohl(dd->ft_data_ro),
+ (size_t) ntohl(dd->ft_burst_len));
+ if (!rc)
+ seq->rec_data = fsp->xfer_len;
+ else if (rc == -ENOMEM)
+ fsp->state |= FC_SRB_NOMEM;
+ } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
+ /*
+ * received a DATA frame
+ * next we will copy the data to the system buffer
+ */
+ WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
+ fc_fcp_recv_data(fsp, fp);
+ seq->rec_data = fsp->xfer_contig_end;
+ } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
+ WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
+
+ fc_fcp_resp(fsp, fp);
+ } else {
+ FC_DBG("unexpected frame. r_ctl %x\n", r_ctl);
+ }
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_frame_free(fp);
+errout:
+ if (IS_ERR(fp))
+ fc_fcp_error(fsp, fp);
+ else if (rc == -ENOMEM)
+ fc_fcp_reduce_can_queue(lp);
+}
+
+static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fcp_resp *fc_rp;
+ struct fcp_resp_ext *rp_ex;
+ struct fcp_resp_rsp_info *fc_rp_info;
+ u32 plen;
+ u32 expected_len;
+ u32 respl = 0;
+ u32 snsl = 0;
+ u8 flags = 0;
+
+ plen = fr_len(fp);
+ fh = (struct fc_frame_header *)fr_hdr(fp);
+ if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
+ goto len_err;
+ plen -= sizeof(*fh);
+ fc_rp = (struct fcp_resp *)(fh + 1);
+ fsp->cdb_status = fc_rp->fr_status;
+ flags = fc_rp->fr_flags;
+ fsp->scsi_comp_flags = flags;
+ expected_len = fsp->data_len;
+
+ if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
+ rp_ex = (void *)(fc_rp + 1);
+ if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
+ if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
+ goto len_err;
+ fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
+ if (flags & FCP_RSP_LEN_VAL) {
+ respl = ntohl(rp_ex->fr_rsp_len);
+ if (respl != sizeof(*fc_rp_info))
+ goto len_err;
+ if (fsp->wait_for_comp) {
+ /* Abuse cdb_status for rsp code */
+ fsp->cdb_status = fc_rp_info->rsp_code;
+ complete(&fsp->tm_done);
+ /*
+ * tmfs will not have any scsi cmd so
+ * exit here
+ */
+ return;
+ } else
+ goto err;
+ }
+ if (flags & FCP_SNS_LEN_VAL) {
+ snsl = ntohl(rp_ex->fr_sns_len);
+ if (snsl > SCSI_SENSE_BUFFERSIZE)
+ snsl = SCSI_SENSE_BUFFERSIZE;
+ memcpy(fsp->cmd->sense_buffer,
+ (char *)fc_rp_info + respl, snsl);
+ }
+ }
+ if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
+ if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
+ goto len_err;
+ if (flags & FCP_RESID_UNDER) {
+ fsp->scsi_resid = ntohl(rp_ex->fr_resid);
+ /*
+ * The cmnd->underflow is the minimum number of
+ * bytes that must be transfered for this
+ * command. Provided a sense condition is not
+ * present, make sure the actual amount
+ * transferred is at least the underflow value
+ * or fail.
+ */
+ if (!(flags & FCP_SNS_LEN_VAL) &&
+ (fc_rp->fr_status == 0) &&
+ (scsi_bufflen(fsp->cmd) -
+ fsp->scsi_resid) < fsp->cmd->underflow)
+ goto err;
+ expected_len -= fsp->scsi_resid;
+ } else {
+ fsp->status_code = FC_ERROR;
+ }
+ }
+ }
+ fsp->state |= FC_SRB_RCV_STATUS;
+
+ /*
+ * Check for missing or extra data frames.
+ */
+ if (unlikely(fsp->xfer_len != expected_len)) {
+ if (fsp->xfer_len < expected_len) {
+ /*
+ * Some data may be queued locally,
+ * Wait a at least one jiffy to see if it is delivered.
+ * If this expires without data, we may do SRR.
+ */
+ fc_fcp_timer_set(fsp, 2);
+ return;
+ }
+ fsp->status_code = FC_DATA_OVRRUN;
+ FC_DBG("tgt %6x xfer len %zx greater than expected len %x. "
+ "data len %x\n",
+ fsp->rport->port_id,
+ fsp->xfer_len, expected_len, fsp->data_len);
+ }
+ fc_fcp_complete_locked(fsp);
+ return;
+
+len_err:
+ FC_DBG("short FCP response. flags 0x%x len %u respl %u snsl %u\n",
+ flags, fr_len(fp), respl, snsl);
+err:
+ fsp->status_code = FC_ERROR;
+ fc_fcp_complete_locked(fsp);
+}
+
+/**
+ * fc_fcp_complete_locked - complete processing of a fcp packet
+ * @fsp: fcp packet
+ *
+ * This function may sleep if a timer is pending. The packet lock must be
+ * held, and the host lock must not be held.
+ */
+static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lp = fsp->lp;
+ struct fc_seq *seq;
+ struct fc_exch *ep;
+ u32 f_ctl;
+
+ if (fsp->state & FC_SRB_ABORT_PENDING)
+ return;
+
+ if (fsp->state & FC_SRB_ABORTED) {
+ if (!fsp->status_code)
+ fsp->status_code = FC_CMD_ABORTED;
+ } else {
+ /*
+ * Test for transport underrun, independent of response
+ * underrun status.
+ */
+ if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
+ (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
+ fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
+ fsp->status_code = FC_DATA_UNDRUN;
+ fsp->io_status = SUGGEST_RETRY << 24;
+ }
+ }
+
+ seq = fsp->seq_ptr;
+ if (seq) {
+ fsp->seq_ptr = NULL;
+ if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
+ struct fc_frame *conf_frame;
+ struct fc_seq *csp;
+
+ csp = lp->tt.seq_start_next(seq);
+ conf_frame = fc_frame_alloc(fsp->lp, 0);
+ if (conf_frame) {
+ f_ctl = FC_FC_SEQ_INIT;
+ f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ ep = fc_seq_exch(seq);
+ fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
+ ep->did, ep->sid,
+ FC_TYPE_FCP, f_ctl, 0);
+ lp->tt.seq_send(lp, csp, conf_frame);
+ }
+ }
+ lp->tt.exch_done(seq);
+ }
+ fc_io_compl(fsp);
+}
+
+static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
+{
+ struct fc_lport *lp = fsp->lp;
+
+ if (fsp->seq_ptr) {
+ lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+ fsp->status_code = error;
+}
+
+/**
+ * fc_fcp_cleanup_each_cmd - run fn on each active command
+ * @lp: logical port
+ * @id: target id
+ * @lun: lun
+ * @error: fsp status code
+ *
+ * If lun or id is -1, they are ignored.
+ */
+static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
+ unsigned int lun, int error)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_pkt *fsp;
+ struct scsi_cmnd *sc_cmd;
+ unsigned long flags;
+
+ spin_lock_irqsave(lp->host->host_lock, flags);
+restart:
+ list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
+ sc_cmd = fsp->cmd;
+ if (id != -1 && scmd_id(sc_cmd) != id)
+ continue;
+
+ if (lun != -1 && sc_cmd->device->lun != lun)
+ continue;
+
+ fc_fcp_pkt_hold(fsp);
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+
+ if (!fc_fcp_lock_pkt(fsp)) {
+ fc_fcp_cleanup_cmd(fsp, error);
+ fc_io_compl(fsp);
+ fc_fcp_unlock_pkt(fsp);
+ }
+
+ fc_fcp_pkt_release(fsp);
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ /*
+ * while we dropped the lock multiple pkts could
+ * have been released, so we have to start over.
+ */
+ goto restart;
+ }
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+}
+
+static void fc_fcp_abort_io(struct fc_lport *lp)
+{
+ fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
+}
+
+/**
+ * fc_fcp_pkt_send - send a fcp packet to the lower level.
+ * @lp: fc lport
+ * @fsp: fc packet.
+ *
+ * This is called by upper layer protocol.
+ * Return : zero for success and -1 for failure
+ * Context : called from queuecommand which can be called from process
+ * or scsi soft irq.
+ * Locks : called with the host lock and irqs disabled.
+ */
+static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ int rc;
+
+ fsp->cmd->SCp.ptr = (char *)fsp;
+ fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
+ fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
+
+ int_to_scsilun(fsp->cmd->device->lun,
+ (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
+ memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
+ list_add_tail(&fsp->list, &si->scsi_pkt_queue);
+
+ spin_unlock_irq(lp->host->host_lock);
+ rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
+ spin_lock_irq(lp->host->host_lock);
+ if (rc)
+ list_del(&fsp->list);
+
+ return rc;
+}
+
+static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
+ void (*resp)(struct fc_seq *,
+ struct fc_frame *fp,
+ void *arg))
+{
+ struct fc_frame *fp;
+ struct fc_seq *seq;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+ const size_t len = sizeof(fsp->cdb_cmd);
+ int rc = 0;
+
+ if (fc_fcp_lock_pkt(fsp))
+ return 0;
+
+ fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
+ if (!fp) {
+ rc = -1;
+ goto unlock;
+ }
+
+ memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
+ fr_cmd(fp) = fsp->cmd;
+ rport = fsp->rport;
+ fsp->max_payload = rport->maxframe_size;
+ rp = rport->dd_data;
+
+ fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
+ fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
+ FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+
+ seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
+ if (!seq) {
+ fc_frame_free(fp);
+ rc = -1;
+ goto unlock;
+ }
+ fsp->last_pkt_time = jiffies;
+ fsp->seq_ptr = seq;
+ fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
+
+ setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
+ fc_fcp_timer_set(fsp,
+ (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
+ FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+ return rc;
+}
+
+/*
+ * transport error handler
+ */
+static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ int error = PTR_ERR(fp);
+
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+
+ switch (error) {
+ case -FC_EX_CLOSED:
+ fc_fcp_retry_cmd(fsp);
+ goto unlock;
+ default:
+ FC_DBG("unknown error %ld\n", PTR_ERR(fp));
+ }
+ /*
+ * clear abort pending, because the lower layer
+ * decided to force completion.
+ */
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+ fsp->status_code = FC_CMD_PLOGO;
+ fc_fcp_complete_locked(fsp);
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+}
+
+/*
+ * Scsi abort handler- calls to send an abort
+ * and then wait for abort completion
+ */
+static int fc_fcp_pkt_abort(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
+{
+ int rc = FAILED;
+
+ if (fc_fcp_send_abort(fsp))
+ return FAILED;
+
+ init_completion(&fsp->tm_done);
+ fsp->wait_for_comp = 1;
+
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ fsp->wait_for_comp = 0;
+
+ if (!rc) {
+ FC_DBG("target abort cmd failed\n");
+ rc = FAILED;
+ } else if (fsp->state & FC_SRB_ABORTED) {
+ FC_DBG("target abort cmd passed\n");
+ rc = SUCCESS;
+ fc_fcp_complete_locked(fsp);
+ }
+
+ return rc;
+}
+
+/*
+ * Retry LUN reset after resource allocation failed.
+ */
+static void fc_lun_reset_send(unsigned long data)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
+ struct fc_lport *lp = fsp->lp;
+ if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) {
+ if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
+ return;
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+ setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ fc_fcp_unlock_pkt(fsp);
+ }
+}
+
+/*
+ * Scsi device reset handler- send a LUN RESET to the device
+ * and wait for reset reply
+ */
+static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
+ unsigned int id, unsigned int lun)
+{
+ int rc;
+
+ fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
+ fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
+ int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
+
+ fsp->wait_for_comp = 1;
+ init_completion(&fsp->tm_done);
+
+ fc_lun_reset_send((unsigned long)fsp);
+
+ /*
+ * wait for completion of reset
+ * after that make sure all commands are terminated
+ */
+ rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
+
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ fsp->state |= FC_SRB_COMPL;
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+
+ del_timer_sync(&fsp->timer);
+
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (fsp->seq_ptr) {
+ lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+ fsp->wait_for_comp = 0;
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+
+ if (!rc) {
+ FC_DBG("lun reset failed\n");
+ return FAILED;
+ }
+
+ /* cdb_status holds the tmf's rsp code */
+ if (fsp->cdb_status != FCP_TMF_CMPL)
+ return FAILED;
+
+ FC_DBG("lun reset to lun %u completed\n", lun);
+ fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
+ return SUCCESS;
+}
+
+/*
+ * Task Managment response handler
+ */
+static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = arg;
+ struct fc_frame_header *fh;
+
+ if (IS_ERR(fp)) {
+ /*
+ * If there is an error just let it timeout or wait
+ * for TMF to be aborted if it timedout.
+ *
+ * scsi-eh will escalate for when either happens.
+ */
+ return;
+ }
+
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+
+ /*
+ * raced with eh timeout handler.
+ */
+ if (!fsp->seq_ptr || !fsp->wait_for_comp) {
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ return;
+ }
+
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_type != FC_TYPE_BLS)
+ fc_fcp_resp(fsp, fp);
+ fsp->seq_ptr = NULL;
+ fsp->lp->tt.exch_done(seq);
+ fc_frame_free(fp);
+ fc_fcp_unlock_pkt(fsp);
+}
+
+static void fc_fcp_cleanup(struct fc_lport *lp)
+{
+ fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
+}
+
+/*
+ * fc_fcp_timeout: called by OS timer function.
+ *
+ * The timer has been inactivated and must be reactivated if desired
+ * using fc_fcp_timer_set().
+ *
+ * Algorithm:
+ *
+ * If REC is supported, just issue it, and return. The REC exchange will
+ * complete or time out, and recovery can continue at that point.
+ *
+ * Otherwise, if the response has been received without all the data,
+ * it has been ER_TIMEOUT since the response was received.
+ *
+ * If the response has not been received,
+ * we see if data was received recently. If it has been, we continue waiting,
+ * otherwise, we abort the command.
+ */
+static void fc_fcp_timeout(unsigned long data)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
+ struct fc_rport *rport = fsp->rport;
+ struct fc_rport_libfc_priv *rp = rport->dd_data;
+
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+
+ if (fsp->cdb_cmd.fc_tm_flags)
+ goto unlock;
+
+ fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
+
+ if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
+ fc_fcp_rec(fsp);
+ else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
+ jiffies))
+ fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
+ else if (fsp->state & FC_SRB_RCV_STATUS)
+ fc_fcp_complete_locked(fsp);
+ else
+ fc_timeout_error(fsp);
+ fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+}
+
+/*
+ * Send a REC ELS request
+ */
+static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lp;
+ struct fc_frame *fp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+
+ lp = fsp->lp;
+ rport = fsp->rport;
+ rp = rport->dd_data;
+ if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
+ fsp->status_code = FC_HRD_ERROR;
+ fsp->io_status = SUGGEST_RETRY << 24;
+ fc_fcp_complete_locked(fsp);
+ return;
+ }
+ fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
+ if (!fp)
+ goto retry;
+
+ fr_seq(fp) = fsp->seq_ptr;
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
+ fc_host_port_id(rp->local_port->host), FC_TYPE_ELS,
+ FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+ if (lp->tt.elsct_send(lp, rport, fp, ELS_REC, fc_fcp_rec_resp,
+ fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) {
+ fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
+ return;
+ }
+ fc_frame_free(fp);
+retry:
+ if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ else
+ fc_timeout_error(fsp);
+}
+
+/*
+ * Receive handler for REC ELS frame
+ * if it is a reject then let the scsi layer to handle
+ * the timeout. if it is a LS_ACC then if the io was not completed
+ * then set the timeout and return otherwise complete the exchange
+ * and tell the scsi layer to restart the I/O.
+ */
+static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
+ struct fc_els_rec_acc *recp;
+ struct fc_els_ls_rjt *rjt;
+ u32 e_stat;
+ u8 opcode;
+ u32 offset;
+ enum dma_data_direction data_dir;
+ enum fc_rctl r_ctl;
+ struct fc_rport_libfc_priv *rp;
+
+ if (IS_ERR(fp)) {
+ fc_fcp_rec_error(fsp, fp);
+ return;
+ }
+
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+
+ fsp->recov_retry = 0;
+ opcode = fc_frame_payload_op(fp);
+ if (opcode == ELS_LS_RJT) {
+ rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+ switch (rjt->er_reason) {
+ default:
+ FC_DEBUG_FCP("device %x unexpected REC reject "
+ "reason %d expl %d\n",
+ fsp->rport->port_id, rjt->er_reason,
+ rjt->er_explan);
+ /* fall through */
+ case ELS_RJT_UNSUP:
+ FC_DEBUG_FCP("device does not support REC\n");
+ rp = fsp->rport->dd_data;
+ /*
+ * if we do not spport RECs or got some bogus
+ * reason then resetup timer so we check for
+ * making progress.
+ */
+ rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
+ fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
+ break;
+ case ELS_RJT_LOGIC:
+ case ELS_RJT_UNAB:
+ /*
+ * If no data transfer, the command frame got dropped
+ * so we just retry. If data was transferred, we
+ * lost the response but the target has no record,
+ * so we abort and retry.
+ */
+ if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
+ fsp->xfer_len == 0) {
+ fc_fcp_retry_cmd(fsp);
+ break;
+ }
+ fc_timeout_error(fsp);
+ break;
+ }
+ } else if (opcode == ELS_LS_ACC) {
+ if (fsp->state & FC_SRB_ABORTED)
+ goto unlock_out;
+
+ data_dir = fsp->cmd->sc_data_direction;
+ recp = fc_frame_payload_get(fp, sizeof(*recp));
+ offset = ntohl(recp->reca_fc4value);
+ e_stat = ntohl(recp->reca_e_stat);
+
+ if (e_stat & ESB_ST_COMPLETE) {
+
+ /*
+ * The exchange is complete.
+ *
+ * For output, we must've lost the response.
+ * For input, all data must've been sent.
+ * We lost may have lost the response
+ * (and a confirmation was requested) and maybe
+ * some data.
+ *
+ * If all data received, send SRR
+ * asking for response. If partial data received,
+ * or gaps, SRR requests data at start of gap.
+ * Recovery via SRR relies on in-order-delivery.
+ */
+ if (data_dir == DMA_TO_DEVICE) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ } else if (fsp->xfer_contig_end == offset) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ } else {
+ offset = fsp->xfer_contig_end;
+ r_ctl = FC_RCTL_DD_SOL_DATA;
+ }
+ fc_fcp_srr(fsp, r_ctl, offset);
+ } else if (e_stat & ESB_ST_SEQ_INIT) {
+
+ /*
+ * The remote port has the initiative, so just
+ * keep waiting for it to complete.
+ */
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ } else {
+
+ /*
+ * The exchange is incomplete, we have seq. initiative.
+ * Lost response with requested confirmation,
+ * lost confirmation, lost transfer ready or
+ * lost write data.
+ *
+ * For output, if not all data was received, ask
+ * for transfer ready to be repeated.
+ *
+ * If we received or sent all the data, send SRR to
+ * request response.
+ *
+ * If we lost a response, we may have lost some read
+ * data as well.
+ */
+ r_ctl = FC_RCTL_DD_SOL_DATA;
+ if (data_dir == DMA_TO_DEVICE) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ if (offset < fsp->data_len)
+ r_ctl = FC_RCTL_DD_DATA_DESC;
+ } else if (offset == fsp->xfer_contig_end) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ } else if (fsp->xfer_contig_end < offset) {
+ offset = fsp->xfer_contig_end;
+ }
+ fc_fcp_srr(fsp, r_ctl, offset);
+ }
+ }
+unlock_out:
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
+ fc_frame_free(fp);
+}
+
+/*
+ * Handle error response or timeout for REC exchange.
+ */
+static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ int error = PTR_ERR(fp);
+
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+
+ switch (error) {
+ case -FC_EX_CLOSED:
+ fc_fcp_retry_cmd(fsp);
+ break;
+
+ default:
+ FC_DBG("REC %p fid %x error unexpected error %d\n",
+ fsp, fsp->rport->port_id, error);
+ fsp->status_code = FC_CMD_PLOGO;
+ /* fall through */
+
+ case -FC_EX_TIMEOUT:
+ /*
+ * Assume REC or LS_ACC was lost.
+ * The exchange manager will have aborted REC, so retry.
+ */
+ FC_DBG("REC fid %x error error %d retry %d/%d\n",
+ fsp->rport->port_id, error, fsp->recov_retry,
+ FC_MAX_RECOV_RETRY);
+ if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
+ fc_fcp_rec(fsp);
+ else
+ fc_timeout_error(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
+}
+
+/*
+ * Time out error routine:
+ * abort's the I/O close the exchange and
+ * send completion notification to scsi layer
+ */
+static void fc_timeout_error(struct fc_fcp_pkt *fsp)
+{
+ fsp->status_code = FC_CMD_TIME_OUT;
+ fsp->cdb_status = 0;
+ fsp->io_status = 0;
+ /*
+ * if this fails then we let the scsi command timer fire and
+ * scsi-ml escalate.
+ */
+ fc_fcp_send_abort(fsp);
+}
+
+/*
+ * Sequence retransmission request.
+ * This is called after receiving status but insufficient data, or
+ * when expecting status but the request has timed out.
+ */
+static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
+{
+ struct fc_lport *lp = fsp->lp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+ struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
+ struct fc_seq *seq;
+ struct fcp_srr *srr;
+ struct fc_frame *fp;
+ u8 cdb_op;
+
+ rport = fsp->rport;
+ rp = rport->dd_data;
+ cdb_op = fsp->cdb_cmd.fc_cdb[0];
+
+ if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
+ goto retry; /* shouldn't happen */
+ fp = fc_frame_alloc(lp, sizeof(*srr));
+ if (!fp)
+ goto retry;
+
+ srr = fc_frame_payload_get(fp, sizeof(*srr));
+ memset(srr, 0, sizeof(*srr));
+ srr->srr_op = ELS_SRR;
+ srr->srr_ox_id = htons(ep->oxid);
+ srr->srr_rx_id = htons(ep->rxid);
+ srr->srr_r_ctl = r_ctl;
+ srr->srr_rel_off = htonl(offset);
+
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
+ fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
+ FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
+
+ seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
+ fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
+ if (!seq) {
+ fc_frame_free(fp);
+ goto retry;
+ }
+ fsp->recov_seq = seq;
+ fsp->xfer_len = offset;
+ fsp->xfer_contig_end = offset;
+ fsp->state &= ~FC_SRB_RCV_STATUS;
+ fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
+ return;
+retry:
+ fc_fcp_retry_cmd(fsp);
+}
+
+/*
+ * Handle response from SRR.
+ */
+static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = arg;
+ struct fc_frame_header *fh;
+
+ if (IS_ERR(fp)) {
+ fc_fcp_srr_error(fsp, fp);
+ return;
+ }
+
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+
+ fh = fc_frame_header_get(fp);
+ /*
+ * BUG? fc_fcp_srr_error calls exch_done which would release
+ * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
+ * then fc_exch_timeout would be sending an abort. The exch_done
+ * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
+ * an abort response though.
+ */
+ if (fh->fh_type == FC_TYPE_BLS) {
+ fc_fcp_unlock_pkt(fsp);
+ return;
+ }
+
+ fsp->recov_seq = NULL;
+ switch (fc_frame_payload_op(fp)) {
+ case ELS_LS_ACC:
+ fsp->recov_retry = 0;
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ break;
+ case ELS_LS_RJT:
+ default:
+ fc_timeout_error(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+ fsp->lp->tt.exch_done(seq);
+out:
+ fc_frame_free(fp);
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
+}
+
+static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+ fsp->lp->tt.exch_done(fsp->recov_seq);
+ fsp->recov_seq = NULL;
+ switch (PTR_ERR(fp)) {
+ case -FC_EX_TIMEOUT:
+ if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
+ fc_fcp_rec(fsp);
+ else
+ fc_timeout_error(fsp);
+ break;
+ case -FC_EX_CLOSED: /* e.g., link failure */
+ /* fall through */
+ default:
+ fc_fcp_retry_cmd(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
+}
+
+static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
+{
+ /* lock ? */
+ return (lp->state == LPORT_ST_READY) && (lp->link_status & FC_LINK_UP);
+}
+
+/**
+ * fc_queuecommand - The queuecommand function of the scsi template
+ * @cmd: struct scsi_cmnd to be executed
+ * @done: Callback function to be called when cmd is completed
+ *
+ * this is the i/o strategy routine, called by the scsi layer
+ * this routine is called with holding the host_lock.
+ */
+int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
+{
+ struct fc_lport *lp;
+ struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
+ struct fc_fcp_pkt *fsp;
+ struct fc_rport_libfc_priv *rp;
+ int rval;
+ int rc = 0;
+ struct fcoe_dev_stats *stats;
+
+ lp = shost_priv(sc_cmd->device->host);
+
+ rval = fc_remote_port_chkready(rport);
+ if (rval) {
+ sc_cmd->result = rval;
+ done(sc_cmd);
+ goto out;
+ }
+
+ if (!*(struct fc_remote_port **)rport->dd_data) {
+ /*
+ * rport is transitioning from blocked/deleted to
+ * online
+ */
+ sc_cmd->result = DID_IMM_RETRY << 16;
+ done(sc_cmd);
+ goto out;
+ }
+
+ rp = rport->dd_data;
+
+ if (!fc_fcp_lport_queue_ready(lp)) {
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ goto out;
+ }
+
+ fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
+ if (fsp == NULL) {
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ goto out;
+ }
+
+ /*
+ * build the libfc request pkt
+ */
+ fsp->cmd = sc_cmd; /* save the cmd */
+ fsp->lp = lp; /* save the softc ptr */
+ fsp->rport = rport; /* set the remote port ptr */
+ sc_cmd->scsi_done = done;
+
+ /*
+ * set up the transfer length
+ */
+ fsp->data_len = scsi_bufflen(sc_cmd);
+ fsp->xfer_len = 0;
+
+ /*
+ * setup the data direction
+ */
+ stats = lp->dev_stats[smp_processor_id()];
+ if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
+ fsp->req_flags = FC_SRB_READ;
+ stats->InputRequests++;
+ stats->InputMegabytes = fsp->data_len;
+ } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
+ fsp->req_flags = FC_SRB_WRITE;
+ stats->OutputRequests++;
+ stats->OutputMegabytes = fsp->data_len;
+ } else {
+ fsp->req_flags = 0;
+ stats->ControlRequests++;
+ }
+
+ fsp->tgt_flags = rp->flags;
+
+ init_timer(&fsp->timer);
+ fsp->timer.data = (unsigned long)fsp;
+
+ /*
+ * send it to the lower layer
+ * if we get -1 return then put the request in the pending
+ * queue.
+ */
+ rval = fc_fcp_pkt_send(lp, fsp);
+ if (rval != 0) {
+ fsp->state = FC_SRB_FREE;
+ fc_fcp_pkt_release(fsp);
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ }
+out:
+ return rc;
+}
+EXPORT_SYMBOL(fc_queuecommand);
+
+/**
+ * fc_io_compl - Handle responses for completed commands
+ * @fsp: scsi packet
+ *
+ * Translates a error to a Linux SCSI error.
+ *
+ * The fcp packet lock must be held when calling.
+ */
+static void fc_io_compl(struct fc_fcp_pkt *fsp)
+{
+ struct fc_fcp_internal *si;
+ struct scsi_cmnd *sc_cmd;
+ struct fc_lport *lp;
+ unsigned long flags;
+
+ fsp->state |= FC_SRB_COMPL;
+ if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ del_timer_sync(&fsp->timer);
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ }
+
+ lp = fsp->lp;
+ si = fc_get_scsi_internal(lp);
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ if (!fsp->cmd) {
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+ return;
+ }
+
+ /*
+ * if a command timed out while we had to try and throttle IO
+ * and it is now getting cleaned up, then we are about to
+ * try again so clear the throttled flag incase we get more
+ * time outs.
+ */
+ if (si->throttled && fsp->state & FC_SRB_NOMEM)
+ si->throttled = 0;
+
+ sc_cmd = fsp->cmd;
+ fsp->cmd = NULL;
+
+ if (!sc_cmd->SCp.ptr) {
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+ return;
+ }
+
+ CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
+ switch (fsp->status_code) {
+ case FC_COMPLETE:
+ if (fsp->cdb_status == 0) {
+ /*
+ * good I/O status
+ */
+ sc_cmd->result = DID_OK << 16;
+ if (fsp->scsi_resid)
+ CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
+ } else if (fsp->cdb_status == QUEUE_FULL) {
+ struct scsi_device *tmp_sdev;
+ struct scsi_device *sdev = sc_cmd->device;
+
+ shost_for_each_device(tmp_sdev, sdev->host) {
+ if (tmp_sdev->id != sdev->id)
+ continue;
+
+ if (tmp_sdev->queue_depth > 1) {
+ scsi_track_queue_full(tmp_sdev,
+ tmp_sdev->
+ queue_depth - 1);
+ }
+ }
+ sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
+ } else {
+ /*
+ * transport level I/O was ok but scsi
+ * has non zero status
+ */
+ sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
+ }
+ break;
+ case FC_ERROR:
+ sc_cmd->result = DID_ERROR << 16;
+ break;
+ case FC_DATA_UNDRUN:
+ if (fsp->cdb_status == 0) {
+ /*
+ * scsi status is good but transport level
+ * underrun. for read it should be an error??
+ */
+ sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
+ } else {
+ /*
+ * scsi got underrun, this is an error
+ */
+ CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
+ sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
+ }
+ break;
+ case FC_DATA_OVRRUN:
+ /*
+ * overrun is an error
+ */
+ sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
+ break;
+ case FC_CMD_ABORTED:
+ sc_cmd->result = (DID_ABORT << 16) | fsp->io_status;
+ break;
+ case FC_CMD_TIME_OUT:
+ sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
+ break;
+ case FC_CMD_RESET:
+ sc_cmd->result = (DID_RESET << 16);
+ break;
+ case FC_HRD_ERROR:
+ sc_cmd->result = (DID_NO_CONNECT << 16);
+ break;
+ default:
+ sc_cmd->result = (DID_ERROR << 16);
+ break;
+ }
+
+ list_del(&fsp->list);
+ sc_cmd->SCp.ptr = NULL;
+ sc_cmd->scsi_done(sc_cmd);
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+
+ /* release ref from initial allocation in queue command */
+ fc_fcp_pkt_release(fsp);
+}
+
+/**
+ * fc_fcp_complete - complete processing of a fcp packet
+ * @fsp: fcp packet
+ *
+ * This function may sleep if a fsp timer is pending.
+ * The host lock must not be held by caller.
+ */
+void fc_fcp_complete(struct fc_fcp_pkt *fsp)
+{
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+
+ fc_fcp_complete_locked(fsp);
+ fc_fcp_unlock_pkt(fsp);
+}
+EXPORT_SYMBOL(fc_fcp_complete);
+
+/**
+ * fc_eh_abort - Abort a command...from scsi host template
+ * @sc_cmd: scsi command to abort
+ *
+ * send ABTS to the target device and wait for the response
+ * sc_cmd is the pointer to the command to be aborted.
+ */
+int fc_eh_abort(struct scsi_cmnd *sc_cmd)
+{
+ struct fc_fcp_pkt *fsp;
+ struct fc_lport *lp;
+ int rc = FAILED;
+ unsigned long flags;
+
+ lp = shost_priv(sc_cmd->device->host);
+ if (lp->state != LPORT_ST_READY)
+ return rc;
+ else if (!(lp->link_status & FC_LINK_UP))
+ return rc;
+
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ fsp = CMD_SP(sc_cmd);
+ if (!fsp) {
+ /* command completed while scsi eh was setting up */
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+ return SUCCESS;
+ }
+ /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
+ fc_fcp_pkt_hold(fsp);
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+
+ if (fc_fcp_lock_pkt(fsp)) {
+ /* completed while we were waiting for timer to be deleted */
+ rc = SUCCESS;
+ goto release_pkt;
+ }
+
+ rc = fc_fcp_pkt_abort(lp, fsp);
+ fc_fcp_unlock_pkt(fsp);
+
+release_pkt:
+ fc_fcp_pkt_release(fsp);
+ return rc;
+}
+EXPORT_SYMBOL(fc_eh_abort);
+
+/**
+ * fc_eh_device_reset: Reset a single LUN
+ * @sc_cmd: scsi command
+ *
+ * Set from scsi host template to send tm cmd to the target and wait for the
+ * response.
+ */
+int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
+{
+ struct fc_lport *lp;
+ struct fc_fcp_pkt *fsp;
+ struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
+ int rc = FAILED;
+ struct fc_rport_libfc_priv *rp;
+ int rval;
+
+ rval = fc_remote_port_chkready(rport);
+ if (rval)
+ goto out;
+
+ rp = rport->dd_data;
+ lp = shost_priv(sc_cmd->device->host);
+
+ if (lp->state != LPORT_ST_READY)
+ return rc;
+
+ fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
+ if (fsp == NULL) {
+ FC_DBG("could not allocate scsi_pkt\n");
+ sc_cmd->result = DID_NO_CONNECT << 16;
+ goto out;
+ }
+
+ /*
+ * Build the libfc request pkt. Do not set the scsi cmnd, because
+ * the sc passed in is not setup for execution like when sent
+ * through the queuecommand callout.
+ */
+ fsp->lp = lp; /* save the softc ptr */
+ fsp->rport = rport; /* set the remote port ptr */
+
+ /*
+ * flush outstanding commands
+ */
+ rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
+ fsp->state = FC_SRB_FREE;
+ fc_fcp_pkt_release(fsp);
+
+out:
+ return rc;
+}
+EXPORT_SYMBOL(fc_eh_device_reset);
+
+/**
+ * fc_eh_host_reset - The reset function will reset the ports on the host.
+ * @sc_cmd: scsi command
+ */
+int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
+{
+ struct Scsi_Host *shost = sc_cmd->device->host;
+ struct fc_lport *lp = shost_priv(shost);
+ unsigned long wait_tmo;
+
+ lp->tt.lport_reset(lp);
+ wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
+ while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
+ msleep(1000);
+
+ if (fc_fcp_lport_queue_ready(lp)) {
+ shost_printk(KERN_INFO, shost, "Host reset succeeded.\n");
+ return SUCCESS;
+ } else {
+ shost_printk(KERN_INFO, shost, "Host reset failed. "
+ "lport not ready.\n");
+ return FAILED;
+ }
+}
+EXPORT_SYMBOL(fc_eh_host_reset);
+
+/**
+ * fc_slave_alloc - configure queue depth
+ * @sdev: scsi device
+ *
+ * Configures queue depth based on host's cmd_per_len. If not set
+ * then we use the libfc default.
+ */
+int fc_slave_alloc(struct scsi_device *sdev)
+{
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ int queue_depth;
+
+ if (!rport || fc_remote_port_chkready(rport))
+ return -ENXIO;
+
+ if (sdev->tagged_supported) {
+ if (sdev->host->hostt->cmd_per_lun)
+ queue_depth = sdev->host->hostt->cmd_per_lun;
+ else
+ queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
+ scsi_activate_tcq(sdev, queue_depth);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(fc_slave_alloc);
+
+int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
+{
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+ return sdev->queue_depth;
+}
+EXPORT_SYMBOL(fc_change_queue_depth);
+
+int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
+{
+ if (sdev->tagged_supported) {
+ scsi_set_tag_type(sdev, tag_type);
+ if (tag_type)
+ scsi_activate_tcq(sdev, sdev->queue_depth);
+ else
+ scsi_deactivate_tcq(sdev, sdev->queue_depth);
+ } else
+ tag_type = 0;
+
+ return tag_type;
+}
+EXPORT_SYMBOL(fc_change_queue_type);
+
+void fc_fcp_destroy(struct fc_lport *lp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+
+ if (!list_empty(&si->scsi_pkt_queue))
+ printk(KERN_ERR "Leaked scsi packets.\n");
+
+ mempool_destroy(si->scsi_pkt_pool);
+ kfree(si);
+ lp->scsi_priv = NULL;
+}
+EXPORT_SYMBOL(fc_fcp_destroy);
+
+int fc_fcp_init(struct fc_lport *lp)
+{
+ int rc;
+ struct fc_fcp_internal *si;
+
+ if (!lp->tt.fcp_cmd_send)
+ lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
+
+ if (!lp->tt.fcp_cleanup)
+ lp->tt.fcp_cleanup = fc_fcp_cleanup;
+
+ if (!lp->tt.fcp_abort_io)
+ lp->tt.fcp_abort_io = fc_fcp_abort_io;
+
+ si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
+ if (!si)
+ return -ENOMEM;
+ lp->scsi_priv = si;
+ INIT_LIST_HEAD(&si->scsi_pkt_queue);
+
+ si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
+ if (!si->scsi_pkt_pool) {
+ rc = -ENOMEM;
+ goto free_internal;
+ }
+ return 0;
+
+free_internal:
+ kfree(si);
+ return rc;
+}
+EXPORT_SYMBOL(fc_fcp_init);
+
+static int __init libfc_init(void)
+{
+ int rc;
+
+ scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
+ sizeof(struct fc_fcp_pkt),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (scsi_pkt_cachep == NULL) {
+ FC_DBG("Unable to allocate SRB cache...module load failed!");
+ return -ENOMEM;
+ }
+
+ rc = fc_setup_exch_mgr();
+ if (rc)
+ goto destroy_pkt_cache;
+
+ rc = fc_setup_rport();
+ if (rc)
+ goto destroy_em;
+
+ return rc;
+destroy_em:
+ fc_destroy_exch_mgr();
+destroy_pkt_cache:
+ kmem_cache_destroy(scsi_pkt_cachep);
+ return rc;
+}
+
+static void __exit libfc_exit(void)
+{
+ kmem_cache_destroy(scsi_pkt_cachep);
+ fc_destroy_exch_mgr();
+ fc_destroy_rport();
+}
+
+module_init(libfc_init);
+module_exit(libfc_exit);
--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Frame allocation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/crc32.h>
+
+#include <scsi/fc_frame.h>
+
+/*
+ * Check the CRC in a frame.
+ */
+u32 fc_frame_crc_check(struct fc_frame *fp)
+{
+ u32 crc;
+ u32 error;
+ const u8 *bp;
+ unsigned int len;
+
+ WARN_ON(!fc_frame_is_linear(fp));
+ fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
+ len = (fr_len(fp) + 3) & ~3; /* round up length to include fill */
+ bp = (const u8 *) fr_hdr(fp);
+ crc = ~crc32(~0, bp, len);
+ error = crc ^ fr_crc(fp);
+ return error;
+}
+EXPORT_SYMBOL(fc_frame_crc_check);
+
+/*
+ * Allocate a frame intended to be sent via fcoe_xmit.
+ * Get an sk_buff for the frame and set the length.
+ */
+struct fc_frame *__fc_frame_alloc(size_t len)
+{
+ struct fc_frame *fp;
+ struct sk_buff *skb;
+
+ WARN_ON((len % sizeof(u32)) != 0);
+ len += sizeof(struct fc_frame_header);
+ skb = dev_alloc_skb(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM);
+ if (!skb)
+ return NULL;
+ fp = (struct fc_frame *) skb;
+ fc_frame_init(fp);
+ skb_reserve(skb, FC_FRAME_HEADROOM);
+ skb_put(skb, len);
+ return fp;
+}
+EXPORT_SYMBOL(__fc_frame_alloc);
+
+
+struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
+{
+ struct fc_frame *fp;
+ size_t fill;
+
+ fill = payload_len % 4;
+ if (fill != 0)
+ fill = 4 - fill;
+ fp = __fc_frame_alloc(payload_len + fill);
+ if (fp) {
+ memset((char *) fr_hdr(fp) + payload_len, 0, fill);
+ /* trim is OK, we just allocated it so there are no fragments */
+ skb_trim(fp_skb(fp),
+ payload_len + sizeof(struct fc_frame_header));
+ }
+ return fp;
+}
--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * PORT LOCKING NOTES
+ *
+ * These comments only apply to the 'port code' which consists of the lport,
+ * disc and rport blocks.
+ *
+ * MOTIVATION
+ *
+ * The lport, disc and rport blocks all have mutexes that are used to protect
+ * those objects. The main motivation for these locks is to prevent from
+ * having an lport reset just before we send a frame. In that scenario the
+ * lport's FID would get set to zero and then we'd send a frame with an
+ * invalid SID. We also need to ensure that states don't change unexpectedly
+ * while processing another state.
+ *
+ * HEIRARCHY
+ *
+ * The following heirarchy defines the locking rules. A greater lock
+ * may be held before acquiring a lesser lock, but a lesser lock should never
+ * be held while attempting to acquire a greater lock. Here is the heirarchy-
+ *
+ * lport > disc, lport > rport, disc > rport
+ *
+ * CALLBACKS
+ *
+ * The callbacks cause complications with this scheme. There is a callback
+ * from the rport (to either lport or disc) and a callback from disc
+ * (to the lport).
+ *
+ * As rports exit the rport state machine a callback is made to the owner of
+ * the rport to notify success or failure. Since the callback is likely to
+ * cause the lport or disc to grab its lock we cannot hold the rport lock
+ * while making the callback. To ensure that the rport is not free'd while
+ * processing the callback the rport callbacks are serialized through a
+ * single-threaded workqueue. An rport would never be free'd while in a
+ * callback handler becuase no other rport work in this queue can be executed
+ * at the same time.
+ *
+ * When discovery succeeds or fails a callback is made to the lport as
+ * notification. Currently, succesful discovery causes the lport to take no
+ * action. A failure will cause the lport to reset. There is likely a circular
+ * locking problem with this implementation.
+ */
+
+/*
+ * LPORT LOCKING
+ *
+ * The critical sections protected by the lport's mutex are quite broad and
+ * may be improved upon in the future. The lport code and its locking doesn't
+ * influence the I/O path, so excessive locking doesn't penalize I/O
+ * performance.
+ *
+ * The strategy is to lock whenever processing a request or response. Note
+ * that every _enter_* function corresponds to a state change. They generally
+ * change the lports state and then send a request out on the wire. We lock
+ * before calling any of these functions to protect that state change. This
+ * means that the entry points into the lport block manage the locks while
+ * the state machine can transition between states (i.e. _enter_* functions)
+ * while always staying protected.
+ *
+ * When handling responses we also hold the lport mutex broadly. When the
+ * lport receives the response frame it locks the mutex and then calls the
+ * appropriate handler for the particuar response. Generally a response will
+ * trigger a state change and so the lock must already be held.
+ *
+ * Retries also have to consider the locking. The retries occur from a work
+ * context and the work function will lock the lport and then retry the state
+ * (i.e. _enter_* function).
+ */
+
+#include <linux/timer.h>
+#include <asm/unaligned.h>
+
+#include <scsi/fc/fc_gs.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+/* Fabric IDs to use for point-to-point mode, chosen on whims. */
+#define FC_LOCAL_PTP_FID_LO 0x010101
+#define FC_LOCAL_PTP_FID_HI 0x010102
+
+#define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
+
+static int fc_lport_debug;
+
+#define FC_DEBUG_LPORT(fmt...) \
+ do { \
+ if (fc_lport_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static void fc_lport_error(struct fc_lport *, struct fc_frame *);
+
+static void fc_lport_enter_reset(struct fc_lport *);
+static void fc_lport_enter_flogi(struct fc_lport *);
+static void fc_lport_enter_dns(struct fc_lport *);
+static void fc_lport_enter_rpn_id(struct fc_lport *);
+static void fc_lport_enter_rft_id(struct fc_lport *);
+static void fc_lport_enter_scr(struct fc_lport *);
+static void fc_lport_enter_ready(struct fc_lport *);
+static void fc_lport_enter_logo(struct fc_lport *);
+
+static const char *fc_lport_state_names[] = {
+ [LPORT_ST_NONE] = "none",
+ [LPORT_ST_FLOGI] = "FLOGI",
+ [LPORT_ST_DNS] = "dNS",
+ [LPORT_ST_RPN_ID] = "RPN_ID",
+ [LPORT_ST_RFT_ID] = "RFT_ID",
+ [LPORT_ST_SCR] = "SCR",
+ [LPORT_ST_READY] = "Ready",
+ [LPORT_ST_LOGO] = "LOGO",
+ [LPORT_ST_RESET] = "reset",
+};
+
+static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
+{
+ fc_frame_free(fp);
+ return 0;
+}
+
+/**
+ * fc_lport_rport_callback - Event handler for rport events
+ * @lport: The lport which is receiving the event
+ * @rport: The rport which the event has occured on
+ * @event: The event that occured
+ *
+ * Locking Note: The rport lock should not be held when calling
+ * this function.
+ */
+static void fc_lport_rport_callback(struct fc_lport *lport,
+ struct fc_rport *rport,
+ enum fc_rport_event event)
+{
+ FC_DEBUG_LPORT("Received a %d event for port (%6x)\n", event,
+ rport->port_id);
+
+ switch (event) {
+ case RPORT_EV_CREATED:
+ if (rport->port_id == FC_FID_DIR_SERV) {
+ mutex_lock(&lport->lp_mutex);
+ if (lport->state == LPORT_ST_DNS) {
+ lport->dns_rp = rport;
+ fc_lport_enter_rpn_id(lport);
+ } else {
+ FC_DEBUG_LPORT("Received an CREATED event on "
+ "port (%6x) for the directory "
+ "server, but the lport is not "
+ "in the DNS state, it's in the "
+ "%d state", rport->port_id,
+ lport->state);
+ lport->tt.rport_logoff(rport);
+ }
+ mutex_unlock(&lport->lp_mutex);
+ } else
+ FC_DEBUG_LPORT("Received an event for port (%6x) "
+ "which is not the directory server\n",
+ rport->port_id);
+ break;
+ case RPORT_EV_LOGO:
+ case RPORT_EV_FAILED:
+ case RPORT_EV_STOP:
+ if (rport->port_id == FC_FID_DIR_SERV) {
+ mutex_lock(&lport->lp_mutex);
+ lport->dns_rp = NULL;
+ mutex_unlock(&lport->lp_mutex);
+
+ } else
+ FC_DEBUG_LPORT("Received an event for port (%6x) "
+ "which is not the directory server\n",
+ rport->port_id);
+ break;
+ case RPORT_EV_NONE:
+ break;
+ }
+}
+
+/**
+ * fc_lport_state - Return a string which represents the lport's state
+ * @lport: The lport whose state is to converted to a string
+ */
+static const char *fc_lport_state(struct fc_lport *lport)
+{
+ const char *cp;
+
+ cp = fc_lport_state_names[lport->state];
+ if (!cp)
+ cp = "unknown";
+ return cp;
+}
+
+/**
+ * fc_lport_ptp_setup - Create an rport for point-to-point mode
+ * @lport: The lport to attach the ptp rport to
+ * @fid: The FID of the ptp rport
+ * @remote_wwpn: The WWPN of the ptp rport
+ * @remote_wwnn: The WWNN of the ptp rport
+ */
+static void fc_lport_ptp_setup(struct fc_lport *lport,
+ u32 remote_fid, u64 remote_wwpn,
+ u64 remote_wwnn)
+{
+ struct fc_disc_port dp;
+
+ dp.lp = lport;
+ dp.ids.port_id = remote_fid;
+ dp.ids.port_name = remote_wwpn;
+ dp.ids.node_name = remote_wwnn;
+ dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
+
+ if (lport->ptp_rp) {
+ lport->tt.rport_logoff(lport->ptp_rp);
+ lport->ptp_rp = NULL;
+ }
+
+ lport->ptp_rp = fc_rport_rogue_create(&dp);
+
+ lport->tt.rport_login(lport->ptp_rp);
+
+ fc_lport_enter_ready(lport);
+}
+
+void fc_get_host_port_type(struct Scsi_Host *shost)
+{
+ /* TODO - currently just NPORT */
+ fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
+}
+EXPORT_SYMBOL(fc_get_host_port_type);
+
+void fc_get_host_port_state(struct Scsi_Host *shost)
+{
+ struct fc_lport *lp = shost_priv(shost);
+
+ if ((lp->link_status & FC_LINK_UP) == FC_LINK_UP)
+ fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
+ else
+ fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
+}
+EXPORT_SYMBOL(fc_get_host_port_state);
+
+void fc_get_host_speed(struct Scsi_Host *shost)
+{
+ struct fc_lport *lport = shost_priv(shost);
+
+ fc_host_speed(shost) = lport->link_speed;
+}
+EXPORT_SYMBOL(fc_get_host_speed);
+
+struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
+{
+ int i;
+ struct fc_host_statistics *fcoe_stats;
+ struct fc_lport *lp = shost_priv(shost);
+ struct timespec v0, v1;
+
+ fcoe_stats = &lp->host_stats;
+ memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
+
+ jiffies_to_timespec(jiffies, &v0);
+ jiffies_to_timespec(lp->boot_time, &v1);
+ fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
+
+ for_each_online_cpu(i) {
+ struct fcoe_dev_stats *stats = lp->dev_stats[i];
+ if (stats == NULL)
+ continue;
+ fcoe_stats->tx_frames += stats->TxFrames;
+ fcoe_stats->tx_words += stats->TxWords;
+ fcoe_stats->rx_frames += stats->RxFrames;
+ fcoe_stats->rx_words += stats->RxWords;
+ fcoe_stats->error_frames += stats->ErrorFrames;
+ fcoe_stats->invalid_crc_count += stats->InvalidCRCCount;
+ fcoe_stats->fcp_input_requests += stats->InputRequests;
+ fcoe_stats->fcp_output_requests += stats->OutputRequests;
+ fcoe_stats->fcp_control_requests += stats->ControlRequests;
+ fcoe_stats->fcp_input_megabytes += stats->InputMegabytes;
+ fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes;
+ fcoe_stats->link_failure_count += stats->LinkFailureCount;
+ }
+ fcoe_stats->lip_count = -1;
+ fcoe_stats->nos_count = -1;
+ fcoe_stats->loss_of_sync_count = -1;
+ fcoe_stats->loss_of_signal_count = -1;
+ fcoe_stats->prim_seq_protocol_err_count = -1;
+ fcoe_stats->dumped_frames = -1;
+ return fcoe_stats;
+}
+EXPORT_SYMBOL(fc_get_host_stats);
+
+/*
+ * Fill in FLOGI command for request.
+ */
+static void
+fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi,
+ unsigned int op)
+{
+ struct fc_els_csp *sp;
+ struct fc_els_cssp *cp;
+
+ memset(flogi, 0, sizeof(*flogi));
+ flogi->fl_cmd = (u8) op;
+ put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
+ put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
+ sp = &flogi->fl_csp;
+ sp->sp_hi_ver = 0x20;
+ sp->sp_lo_ver = 0x20;
+ sp->sp_bb_cred = htons(10); /* this gets set by gateway */
+ sp->sp_bb_data = htons((u16) lport->mfs);
+ cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
+ cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
+ if (op != ELS_FLOGI) {
+ sp->sp_features = htons(FC_SP_FT_CIRO);
+ sp->sp_tot_seq = htons(255); /* seq. we accept */
+ sp->sp_rel_off = htons(0x1f);
+ sp->sp_e_d_tov = htonl(lport->e_d_tov);
+
+ cp->cp_rdfs = htons((u16) lport->mfs);
+ cp->cp_con_seq = htons(255);
+ cp->cp_open_seq = 1;
+ }
+}
+
+/*
+ * Add a supported FC-4 type.
+ */
+static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
+{
+ __be32 *mp;
+
+ mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
+ *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
+}
+
+/**
+ * fc_lport_recv_rlir_req - Handle received Registered Link Incident Report.
+ * @lport: Fibre Channel local port recieving the RLIR
+ * @sp: current sequence in the RLIR exchange
+ * @fp: RLIR request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Received RLIR request while in state %s\n",
+ fc_lport_state(lport));
+
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_lport_recv_echo_req - Handle received ECHO request
+ * @lport: Fibre Channel local port recieving the ECHO
+ * @sp: current sequence in the ECHO exchange
+ * @fp: ECHO request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_exch *ep = fc_seq_exch(sp);
+ unsigned int len;
+ void *pp;
+ void *dp;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received RLIR request while in state %s\n",
+ fc_lport_state(lport));
+
+ len = fr_len(in_fp) - sizeof(struct fc_frame_header);
+ pp = fc_frame_payload_get(in_fp, len);
+
+ if (len < sizeof(__be32))
+ len = sizeof(__be32);
+
+ fp = fc_frame_alloc(lport, len);
+ if (fp) {
+ dp = fc_frame_payload_get(fp, len);
+ memcpy(dp, pp, len);
+ *((u32 *)dp) = htonl(ELS_LS_ACC << 24);
+ sp = lport->tt.seq_start_next(sp);
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+ }
+ fc_frame_free(in_fp);
+}
+
+/**
+ * fc_lport_recv_echo_req - Handle received Request Node ID data request
+ * @lport: Fibre Channel local port recieving the RNID
+ * @sp: current sequence in the RNID exchange
+ * @fp: RNID request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_exch *ep = fc_seq_exch(sp);
+ struct fc_els_rnid *req;
+ struct {
+ struct fc_els_rnid_resp rnid;
+ struct fc_els_rnid_cid cid;
+ struct fc_els_rnid_gen gen;
+ } *rp;
+ struct fc_seq_els_data rjt_data;
+ u8 fmt;
+ size_t len;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received RNID request while in state %s\n",
+ fc_lport_state(lport));
+
+ req = fc_frame_payload_get(in_fp, sizeof(*req));
+ if (!req) {
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_LOGIC;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ } else {
+ fmt = req->rnid_fmt;
+ len = sizeof(*rp);
+ if (fmt != ELS_RNIDF_GEN ||
+ ntohl(lport->rnid_gen.rnid_atype) == 0) {
+ fmt = ELS_RNIDF_NONE; /* nothing to provide */
+ len -= sizeof(rp->gen);
+ }
+ fp = fc_frame_alloc(lport, len);
+ if (fp) {
+ rp = fc_frame_payload_get(fp, len);
+ memset(rp, 0, len);
+ rp->rnid.rnid_cmd = ELS_LS_ACC;
+ rp->rnid.rnid_fmt = fmt;
+ rp->rnid.rnid_cid_len = sizeof(rp->cid);
+ rp->cid.rnid_wwpn = htonll(lport->wwpn);
+ rp->cid.rnid_wwnn = htonll(lport->wwnn);
+ if (fmt == ELS_RNIDF_GEN) {
+ rp->rnid.rnid_sid_len = sizeof(rp->gen);
+ memcpy(&rp->gen, &lport->rnid_gen,
+ sizeof(rp->gen));
+ }
+ sp = lport->tt.seq_start_next(sp);
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
+ f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+ }
+ }
+ fc_frame_free(in_fp);
+}
+
+/**
+ * fc_lport_recv_adisc_req - Handle received Address Discovery Request
+ * @lport: Fibre Channel local port recieving the ADISC
+ * @sp: current sequence in the ADISC exchange
+ * @fp: ADISC request frame
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_adisc_req(struct fc_seq *sp, struct fc_frame *in_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_exch *ep = fc_seq_exch(sp);
+ struct fc_els_adisc *req, *rp;
+ struct fc_seq_els_data rjt_data;
+ size_t len;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received ADISC request while in state %s\n",
+ fc_lport_state(lport));
+
+ req = fc_frame_payload_get(in_fp, sizeof(*req));
+ if (!req) {
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_LOGIC;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ } else {
+ len = sizeof(*rp);
+ fp = fc_frame_alloc(lport, len);
+ if (fp) {
+ rp = fc_frame_payload_get(fp, len);
+ memset(rp, 0, len);
+ rp->adisc_cmd = ELS_LS_ACC;
+ rp->adisc_wwpn = htonll(lport->wwpn);
+ rp->adisc_wwnn = htonll(lport->wwnn);
+ hton24(rp->adisc_port_id,
+ fc_host_port_id(lport->host));
+ sp = lport->tt.seq_start_next(sp);
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
+ f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+ }
+ }
+ fc_frame_free(in_fp);
+}
+
+/**
+ * fc_lport_recv_logo_req - Handle received fabric LOGO request
+ * @lport: Fibre Channel local port recieving the LOGO
+ * @sp: current sequence in the LOGO exchange
+ * @fp: LOGO request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_lport_enter_reset(lport);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_fabric_login - Start the lport state machine
+ * @lport: The lport that should log into the fabric
+ *
+ * Locking Note: This function should not be called
+ * with the lport lock held.
+ */
+int fc_fabric_login(struct fc_lport *lport)
+{
+ int rc = -1;
+
+ mutex_lock(&lport->lp_mutex);
+ if (lport->state == LPORT_ST_NONE) {
+ fc_lport_enter_reset(lport);
+ rc = 0;
+ }
+ mutex_unlock(&lport->lp_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(fc_fabric_login);
+
+/**
+ * fc_linkup - Handler for transport linkup events
+ * @lport: The lport whose link is up
+ */
+void fc_linkup(struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Link is up for port (%6x)\n",
+ fc_host_port_id(lport->host));
+
+ mutex_lock(&lport->lp_mutex);
+ if ((lport->link_status & FC_LINK_UP) != FC_LINK_UP) {
+ lport->link_status |= FC_LINK_UP;
+
+ if (lport->state == LPORT_ST_RESET)
+ fc_lport_enter_flogi(lport);
+ }
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_linkup);
+
+/**
+ * fc_linkdown - Handler for transport linkdown events
+ * @lport: The lport whose link is down
+ */
+void fc_linkdown(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ FC_DEBUG_LPORT("Link is down for port (%6x)\n",
+ fc_host_port_id(lport->host));
+
+ if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP) {
+ lport->link_status &= ~(FC_LINK_UP);
+ fc_lport_enter_reset(lport);
+ lport->tt.fcp_cleanup(lport);
+ }
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_linkdown);
+
+/**
+ * fc_pause - Pause the flow of frames
+ * @lport: The lport to be paused
+ */
+void fc_pause(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ lport->link_status |= FC_PAUSE;
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_pause);
+
+/**
+ * fc_unpause - Unpause the flow of frames
+ * @lport: The lport to be unpaused
+ */
+void fc_unpause(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ lport->link_status &= ~(FC_PAUSE);
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_unpause);
+
+/**
+ * fc_fabric_logoff - Logout of the fabric
+ * @lport: fc_lport pointer to logoff the fabric
+ *
+ * Return value:
+ * 0 for success, -1 for failure
+ **/
+int fc_fabric_logoff(struct fc_lport *lport)
+{
+ lport->tt.disc_stop_final(lport);
+ mutex_lock(&lport->lp_mutex);
+ fc_lport_enter_logo(lport);
+ mutex_unlock(&lport->lp_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(fc_fabric_logoff);
+
+/**
+ * fc_lport_destroy - unregister a fc_lport
+ * @lport: fc_lport pointer to unregister
+ *
+ * Return value:
+ * None
+ * Note:
+ * exit routine for fc_lport instance
+ * clean-up all the allocated memory
+ * and free up other system resources.
+ *
+ **/
+int fc_lport_destroy(struct fc_lport *lport)
+{
+ lport->tt.frame_send = fc_frame_drop;
+ lport->tt.fcp_abort_io(lport);
+ lport->tt.exch_mgr_reset(lport->emp, 0, 0);
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_destroy);
+
+/**
+ * fc_set_mfs - sets up the mfs for the corresponding fc_lport
+ * @lport: fc_lport pointer to unregister
+ * @mfs: the new mfs for fc_lport
+ *
+ * Set mfs for the given fc_lport to the new mfs.
+ *
+ * Return: 0 for success
+ *
+ **/
+int fc_set_mfs(struct fc_lport *lport, u32 mfs)
+{
+ unsigned int old_mfs;
+ int rc = -EINVAL;
+
+ mutex_lock(&lport->lp_mutex);
+
+ old_mfs = lport->mfs;
+
+ if (mfs >= FC_MIN_MAX_FRAME) {
+ mfs &= ~3;
+ if (mfs > FC_MAX_FRAME)
+ mfs = FC_MAX_FRAME;
+ mfs -= sizeof(struct fc_frame_header);
+ lport->mfs = mfs;
+ rc = 0;
+ }
+
+ if (!rc && mfs < old_mfs)
+ fc_lport_enter_reset(lport);
+
+ mutex_unlock(&lport->lp_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(fc_set_mfs);
+
+/**
+ * fc_lport_disc_callback - Callback for discovery events
+ * @lport: FC local port
+ * @event: The discovery event
+ */
+void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event)
+{
+ switch (event) {
+ case DISC_EV_SUCCESS:
+ FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n",
+ fc_host_port_id(lport->host));
+ break;
+ case DISC_EV_FAILED:
+ FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n",
+ fc_host_port_id(lport->host));
+ mutex_lock(&lport->lp_mutex);
+ fc_lport_enter_reset(lport);
+ mutex_unlock(&lport->lp_mutex);
+ break;
+ case DISC_EV_NONE:
+ WARN_ON(1);
+ break;
+ }
+}
+
+/**
+ * fc_rport_enter_ready - Enter the ready state and start discovery
+ * @lport: Fibre Channel local port that is ready
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_ready(struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_READY);
+
+ lport->tt.disc_start(fc_lport_disc_callback, lport);
+}
+
+/**
+ * fc_lport_recv_flogi_req - Receive a FLOGI request
+ * @sp_in: The sequence the FLOGI is on
+ * @rx_fp: The frame the FLOGI is in
+ * @lport: The lport that recieved the request
+ *
+ * A received FLOGI request indicates a point-to-point connection.
+ * Accept it with the common service parameters indicating our N port.
+ * Set up to do a PLOGI if we have the higher-number WWPN.
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
+ struct fc_frame *rx_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ struct fc_seq *sp;
+ struct fc_exch *ep;
+ struct fc_els_flogi *flp;
+ struct fc_els_flogi *new_flp;
+ u64 remote_wwpn;
+ u32 remote_fid;
+ u32 local_fid;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received FLOGI request while in state %s\n",
+ fc_lport_state(lport));
+
+ fh = fc_frame_header_get(rx_fp);
+ remote_fid = ntoh24(fh->fh_s_id);
+ flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
+ if (!flp)
+ goto out;
+ remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
+ if (remote_wwpn == lport->wwpn) {
+ FC_DBG("FLOGI from port with same WWPN %llx "
+ "possible configuration error\n", remote_wwpn);
+ goto out;
+ }
+ FC_DBG("FLOGI from port WWPN %llx\n", remote_wwpn);
+
+ /*
+ * XXX what is the right thing to do for FIDs?
+ * The originator might expect our S_ID to be 0xfffffe.
+ * But if so, both of us could end up with the same FID.
+ */
+ local_fid = FC_LOCAL_PTP_FID_LO;
+ if (remote_wwpn < lport->wwpn) {
+ local_fid = FC_LOCAL_PTP_FID_HI;
+ if (!remote_fid || remote_fid == local_fid)
+ remote_fid = FC_LOCAL_PTP_FID_LO;
+ } else if (!remote_fid) {
+ remote_fid = FC_LOCAL_PTP_FID_HI;
+ }
+
+ fc_host_port_id(lport->host) = local_fid;
+
+ fp = fc_frame_alloc(lport, sizeof(*flp));
+ if (fp) {
+ sp = lport->tt.seq_start_next(fr_seq(rx_fp));
+ new_flp = fc_frame_payload_get(fp, sizeof(*flp));
+ fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
+ new_flp->fl_cmd = (u8) ELS_LS_ACC;
+
+ /*
+ * Send the response. If this fails, the originator should
+ * repeat the sequence.
+ */
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ ep = fc_seq_exch(sp);
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+
+ } else {
+ fc_lport_error(lport, fp);
+ }
+ fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
+ get_unaligned_be64(&flp->fl_wwnn));
+
+ lport->tt.disc_start(fc_lport_disc_callback, lport);
+
+out:
+ sp = fr_seq(rx_fp);
+ fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_lport_recv_req - The generic lport request handler
+ * @lport: The lport that received the request
+ * @sp: The sequence the request is on
+ * @fp: The frame the request is in
+ *
+ * This function will see if the lport handles the request or
+ * if an rport should handle the request.
+ *
+ * Locking Note: This function should not be called with the lport
+ * lock held becuase it will grab the lock.
+ */
+static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *);
+ struct fc_rport *rport;
+ u32 s_id;
+ u32 d_id;
+ struct fc_seq_els_data rjt_data;
+
+ mutex_lock(&lport->lp_mutex);
+
+ /*
+ * Handle special ELS cases like FLOGI, LOGO, and
+ * RSCN here. These don't require a session.
+ * Even if we had a session, it might not be ready.
+ */
+ if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) {
+ /*
+ * Check opcode.
+ */
+ recv = NULL;
+ switch (fc_frame_payload_op(fp)) {
+ case ELS_FLOGI:
+ recv = fc_lport_recv_flogi_req;
+ break;
+ case ELS_LOGO:
+ fh = fc_frame_header_get(fp);
+ if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI)
+ recv = fc_lport_recv_logo_req;
+ break;
+ case ELS_RSCN:
+ recv = lport->tt.disc_recv_req;
+ break;
+ case ELS_ECHO:
+ recv = fc_lport_recv_echo_req;
+ break;
+ case ELS_RLIR:
+ recv = fc_lport_recv_rlir_req;
+ break;
+ case ELS_RNID:
+ recv = fc_lport_recv_rnid_req;
+ break;
+ case ELS_ADISC:
+ recv = fc_lport_recv_adisc_req;
+ break;
+ }
+
+ if (recv)
+ recv(sp, fp, lport);
+ else {
+ /*
+ * Find session.
+ * If this is a new incoming PLOGI, we won't find it.
+ */
+ s_id = ntoh24(fh->fh_s_id);
+ d_id = ntoh24(fh->fh_d_id);
+
+ rport = lport->tt.rport_lookup(lport, s_id);
+ if (rport)
+ lport->tt.rport_recv_req(sp, fp, rport);
+ else {
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp,
+ ELS_LS_RJT,
+ &rjt_data);
+ fc_frame_free(fp);
+ }
+ }
+ } else {
+ FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp));
+ fc_frame_free(fp);
+ }
+ mutex_unlock(&lport->lp_mutex);
+
+ /*
+ * The common exch_done for all request may not be good
+ * if any request requires longer hold on exhange. XXX
+ */
+ lport->tt.exch_done(sp);
+}
+
+/**
+ * fc_lport_reset - Reset an lport
+ * @lport: The lport which should be reset
+ *
+ * Locking Note: This functions should not be called with the
+ * lport lock held.
+ */
+int fc_lport_reset(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ fc_lport_enter_reset(lport);
+ mutex_unlock(&lport->lp_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_reset);
+
+/**
+ * fc_rport_enter_reset - Reset the local port
+ * @lport: Fibre Channel local port to be reset
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_reset(struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RESET);
+
+ if (lport->dns_rp)
+ lport->tt.rport_logoff(lport->dns_rp);
+
+ if (lport->ptp_rp) {
+ lport->tt.rport_logoff(lport->ptp_rp);
+ lport->ptp_rp = NULL;
+ }
+
+ lport->tt.disc_stop(lport);
+
+ lport->tt.exch_mgr_reset(lport->emp, 0, 0);
+ fc_host_fabric_name(lport->host) = 0;
+ fc_host_port_id(lport->host) = 0;
+
+ if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP)
+ fc_lport_enter_flogi(lport);
+}
+
+/**
+ * fc_lport_error - Handler for any errors
+ * @lport: The fc_lport object
+ * @fp: The frame pointer
+ *
+ * If the error was caused by a resource allocation failure
+ * then wait for half a second and retry, otherwise retry
+ * after the e_d_tov time.
+ */
+static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
+{
+ unsigned long delay = 0;
+ FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n",
+ PTR_ERR(fp), fc_lport_state(lport),
+ lport->retry_count);
+
+ if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
+ /*
+ * Memory allocation failure, or the exchange timed out.
+ * Retry after delay
+ */
+ if (lport->retry_count < lport->max_retry_count) {
+ lport->retry_count++;
+ if (!fp)
+ delay = msecs_to_jiffies(500);
+ else
+ delay = msecs_to_jiffies(lport->e_d_tov);
+
+ schedule_delayed_work(&lport->retry_work, delay);
+ } else {
+ switch (lport->state) {
+ case LPORT_ST_NONE:
+ case LPORT_ST_READY:
+ case LPORT_ST_RESET:
+ case LPORT_ST_RPN_ID:
+ case LPORT_ST_RFT_ID:
+ case LPORT_ST_SCR:
+ case LPORT_ST_DNS:
+ case LPORT_ST_FLOGI:
+ case LPORT_ST_LOGO:
+ fc_lport_enter_reset(lport);
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * fc_lport_rft_id_resp - Handle response to Register Fibre
+ * Channel Types by ID (RPN_ID) request
+ * @sp: current sequence in RPN_ID exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_frame_header *fh;
+ struct fc_ct_hdr *ct;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a RFT_ID response\n");
+
+ if (lport->state != LPORT_ST_RFT_ID) {
+ FC_DBG("Received a RFT_ID response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ fh = fc_frame_header_get(fp);
+ ct = fc_frame_payload_get(fp, sizeof(*ct));
+
+ if (fh && ct && fh->fh_type == FC_TYPE_CT &&
+ ct->ct_fs_type == FC_FST_DIR &&
+ ct->ct_fs_subtype == FC_NS_SUBTYPE &&
+ ntohs(ct->ct_cmd) == FC_FS_ACC)
+ fc_lport_enter_scr(lport);
+ else
+ fc_lport_error(lport, fp);
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_rpn_id_resp - Handle response to Register Port
+ * Name by ID (RPN_ID) request
+ * @sp: current sequence in RPN_ID exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_frame_header *fh;
+ struct fc_ct_hdr *ct;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a RPN_ID response\n");
+
+ if (lport->state != LPORT_ST_RPN_ID) {
+ FC_DBG("Received a RPN_ID response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ fh = fc_frame_header_get(fp);
+ ct = fc_frame_payload_get(fp, sizeof(*ct));
+ if (fh && ct && fh->fh_type == FC_TYPE_CT &&
+ ct->ct_fs_type == FC_FST_DIR &&
+ ct->ct_fs_subtype == FC_NS_SUBTYPE &&
+ ntohs(ct->ct_cmd) == FC_FS_ACC)
+ fc_lport_enter_rft_id(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_scr_resp - Handle response to State Change Register (SCR) request
+ * @sp: current sequence in SCR exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel lport port instance that sent the registration request
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ u8 op;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a SCR response\n");
+
+ if (lport->state != LPORT_ST_SCR) {
+ FC_DBG("Received a SCR response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC)
+ fc_lport_enter_ready(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_enter_scr - Send a State Change Register (SCR) request
+ * @lport: Fibre Channel local port to register for state changes
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_scr(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+
+ FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_SCR);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR,
+ fc_lport_scr_resp, lport, lport->e_d_tov))
+ fc_lport_error(lport, fp);
+}
+
+/**
+ * fc_lport_enter_rft_id - Register FC4-types with the name server
+ * @lport: Fibre Channel local port to register
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_rft_id(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_ns_fts *lps;
+ int i;
+
+ FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RFT_ID);
+
+ lps = &lport->fcts;
+ i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]);
+ while (--i >= 0)
+ if (ntohl(lps->ff_type_map[i]) != 0)
+ break;
+ if (i < 0) {
+ /* nothing to register, move on to SCR */
+ fc_lport_enter_scr(lport);
+ return;
+ }
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+ sizeof(struct fc_ns_rft));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID,
+ fc_lport_rft_id_resp,
+ lport, lport->e_d_tov))
+ fc_lport_error(lport, fp);
+}
+
+/**
+ * fc_rport_enter_rft_id - Register port name with the name server
+ * @lport: Fibre Channel local port to register
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_rpn_id(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+
+ FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RPN_ID);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+ sizeof(struct fc_ns_rn_id));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID,
+ fc_lport_rpn_id_resp,
+ lport, lport->e_d_tov))
+ fc_lport_error(lport, fp);
+}
+
+static struct fc_rport_operations fc_lport_rport_ops = {
+ .event_callback = fc_lport_rport_callback,
+};
+
+/**
+ * fc_rport_enter_dns - Create a rport to the name server
+ * @lport: Fibre Channel local port requesting a rport for the name server
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_dns(struct fc_lport *lport)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+ struct fc_disc_port dp;
+
+ dp.ids.port_id = FC_FID_DIR_SERV;
+ dp.ids.port_name = -1;
+ dp.ids.node_name = -1;
+ dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
+ dp.lp = lport;
+
+ FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_DNS);
+
+ rport = fc_rport_rogue_create(&dp);
+ if (!rport)
+ goto err;
+
+ rdata = rport->dd_data;
+ rdata->ops = &fc_lport_rport_ops;
+ lport->tt.rport_login(rport);
+ return;
+
+err:
+ fc_lport_error(lport, NULL);
+}
+
+/**
+ * fc_lport_timeout - Handler for the retry_work timer.
+ * @work: The work struct of the fc_lport
+ */
+static void fc_lport_timeout(struct work_struct *work)
+{
+ struct fc_lport *lport =
+ container_of(work, struct fc_lport,
+ retry_work.work);
+
+ mutex_lock(&lport->lp_mutex);
+
+ switch (lport->state) {
+ case LPORT_ST_NONE:
+ case LPORT_ST_READY:
+ case LPORT_ST_RESET:
+ WARN_ON(1);
+ break;
+ case LPORT_ST_FLOGI:
+ fc_lport_enter_flogi(lport);
+ break;
+ case LPORT_ST_DNS:
+ fc_lport_enter_dns(lport);
+ break;
+ case LPORT_ST_RPN_ID:
+ fc_lport_enter_rpn_id(lport);
+ break;
+ case LPORT_ST_RFT_ID:
+ fc_lport_enter_rft_id(lport);
+ break;
+ case LPORT_ST_SCR:
+ fc_lport_enter_scr(lport);
+ break;
+ case LPORT_ST_LOGO:
+ fc_lport_enter_logo(lport);
+ break;
+ }
+
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_logo_resp - Handle response to LOGO request
+ * @sp: current sequence in LOGO exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel lport port instance that sent the LOGO request
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ u8 op;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a LOGO response\n");
+
+ if (lport->state != LPORT_ST_LOGO) {
+ FC_DBG("Received a LOGO response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC)
+ fc_lport_enter_reset(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_rport_enter_logo - Logout of the fabric
+ * @lport: Fibre Channel local port to be logged out
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_logo(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_els_logo *logo;
+
+ FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_LOGO);
+
+ /* DNS session should be closed so we can release it here */
+ if (lport->dns_rp)
+ lport->tt.rport_logoff(lport->dns_rp);
+
+ fp = fc_frame_alloc(lport, sizeof(*logo));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp,
+ lport, lport->e_d_tov))
+ fc_lport_error(lport, fp);
+}
+
+/**
+ * fc_lport_flogi_resp - Handle response to FLOGI request
+ * @sp: current sequence in FLOGI exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_frame_header *fh;
+ struct fc_els_flogi *flp;
+ u32 did;
+ u16 csp_flags;
+ unsigned int r_a_tov;
+ unsigned int e_d_tov;
+ u16 mfs;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a FLOGI response\n");
+
+ if (lport->state != LPORT_ST_FLOGI) {
+ FC_DBG("Received a FLOGI response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ fh = fc_frame_header_get(fp);
+ did = ntoh24(fh->fh_d_id);
+ if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) {
+
+ FC_DEBUG_LPORT("Assigned fid %x\n", did);
+ fc_host_port_id(lport->host) = did;
+
+ flp = fc_frame_payload_get(fp, sizeof(*flp));
+ if (flp) {
+ mfs = ntohs(flp->fl_csp.sp_bb_data) &
+ FC_SP_BB_DATA_MASK;
+ if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
+ mfs < lport->mfs)
+ lport->mfs = mfs;
+ csp_flags = ntohs(flp->fl_csp.sp_features);
+ r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
+ e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
+ if (csp_flags & FC_SP_FT_EDTR)
+ e_d_tov /= 1000000;
+ if ((csp_flags & FC_SP_FT_FPORT) == 0) {
+ if (e_d_tov > lport->e_d_tov)
+ lport->e_d_tov = e_d_tov;
+ lport->r_a_tov = 2 * e_d_tov;
+ FC_DBG("Point-to-Point mode\n");
+ fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id),
+ get_unaligned_be64(
+ &flp->fl_wwpn),
+ get_unaligned_be64(
+ &flp->fl_wwnn));
+ } else {
+ lport->e_d_tov = e_d_tov;
+ lport->r_a_tov = r_a_tov;
+ fc_host_fabric_name(lport->host) =
+ get_unaligned_be64(&flp->fl_wwnn);
+ fc_lport_enter_dns(lport);
+ }
+ }
+
+ if (flp) {
+ csp_flags = ntohs(flp->fl_csp.sp_features);
+ if ((csp_flags & FC_SP_FT_FPORT) == 0) {
+ lport->tt.disc_start(fc_lport_disc_callback,
+ lport);
+ }
+ }
+ } else {
+ FC_DBG("bad FLOGI response\n");
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_rport_enter_flogi - Send a FLOGI request to the fabric manager
+ * @lport: Fibre Channel local port to be logged in to the fabric
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+void fc_lport_enter_flogi(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+
+ FC_DEBUG_LPORT("Processing FLOGI state\n");
+
+ fc_lport_state_enter(lport, LPORT_ST_FLOGI);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
+ if (!fp)
+ return fc_lport_error(lport, fp);
+
+ if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI,
+ fc_lport_flogi_resp, lport, lport->e_d_tov))
+ fc_lport_error(lport, fp);
+}
+
+/* Configure a fc_lport */
+int fc_lport_config(struct fc_lport *lport)
+{
+ INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
+ mutex_init(&lport->lp_mutex);
+
+ fc_lport_state_enter(lport, LPORT_ST_NONE);
+
+ fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
+ fc_lport_add_fc4_type(lport, FC_TYPE_CT);
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_config);
+
+int fc_lport_init(struct fc_lport *lport)
+{
+ if (!lport->tt.lport_recv)
+ lport->tt.lport_recv = fc_lport_recv_req;
+
+ if (!lport->tt.lport_reset)
+ lport->tt.lport_reset = fc_lport_reset;
+
+ fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
+ fc_host_node_name(lport->host) = lport->wwnn;
+ fc_host_port_name(lport->host) = lport->wwpn;
+ fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
+ memset(fc_host_supported_fc4s(lport->host), 0,
+ sizeof(fc_host_supported_fc4s(lport->host)));
+ fc_host_supported_fc4s(lport->host)[2] = 1;
+ fc_host_supported_fc4s(lport->host)[7] = 1;
+
+ /* This value is also unchanging */
+ memset(fc_host_active_fc4s(lport->host), 0,
+ sizeof(fc_host_active_fc4s(lport->host)));
+ fc_host_active_fc4s(lport->host)[2] = 1;
+ fc_host_active_fc4s(lport->host)[7] = 1;
+ fc_host_maxframe_size(lport->host) = lport->mfs;
+ fc_host_supported_speeds(lport->host) = 0;
+ if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
+ fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
+ if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
+ fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_init);
--- /dev/null
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * RPORT GENERAL INFO
+ *
+ * This file contains all processing regarding fc_rports. It contains the
+ * rport state machine and does all rport interaction with the transport class.
+ * There should be no other places in libfc that interact directly with the
+ * transport class in regards to adding and deleting rports.
+ *
+ * fc_rport's represent N_Port's within the fabric.
+ */
+
+/*
+ * RPORT LOCKING
+ *
+ * The rport should never hold the rport mutex and then attempt to acquire
+ * either the lport or disc mutexes. The rport's mutex is considered lesser
+ * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
+ * more comments on the heirarchy.
+ *
+ * The locking strategy is similar to the lport's strategy. The lock protects
+ * the rport's states and is held and released by the entry points to the rport
+ * block. All _enter_* functions correspond to rport states and expect the rport
+ * mutex to be locked before calling them. This means that rports only handle
+ * one request or response at a time, since they're not critical for the I/O
+ * path this potential over-use of the mutex is acceptable.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/rcupdate.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <asm/unaligned.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+static int fc_rport_debug;
+
+#define FC_DEBUG_RPORT(fmt...) \
+ do { \
+ if (fc_rport_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+struct workqueue_struct *rport_event_queue;
+
+static void fc_rport_enter_plogi(struct fc_rport *);
+static void fc_rport_enter_prli(struct fc_rport *);
+static void fc_rport_enter_rtv(struct fc_rport *);
+static void fc_rport_enter_ready(struct fc_rport *);
+static void fc_rport_enter_logo(struct fc_rport *);
+
+static void fc_rport_recv_plogi_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_prli_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_prlo_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_logo_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_timeout(struct work_struct *);
+static void fc_rport_error(struct fc_rport *, struct fc_frame *);
+static void fc_rport_work(struct work_struct *);
+
+static const char *fc_rport_state_names[] = {
+ [RPORT_ST_NONE] = "None",
+ [RPORT_ST_INIT] = "Init",
+ [RPORT_ST_PLOGI] = "PLOGI",
+ [RPORT_ST_PRLI] = "PRLI",
+ [RPORT_ST_RTV] = "RTV",
+ [RPORT_ST_READY] = "Ready",
+ [RPORT_ST_LOGO] = "LOGO",
+};
+
+static void fc_rport_rogue_destroy(struct device *dev)
+{
+ struct fc_rport *rport = dev_to_rport(dev);
+ FC_DEBUG_RPORT("Destroying rogue rport (%6x)\n", rport->port_id);
+ kfree(rport);
+}
+
+struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *dp)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+ rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL);
+
+ if (!rport)
+ return NULL;
+
+ rdata = RPORT_TO_PRIV(rport);
+
+ rport->dd_data = rdata;
+ rport->port_id = dp->ids.port_id;
+ rport->port_name = dp->ids.port_name;
+ rport->node_name = dp->ids.node_name;
+ rport->roles = dp->ids.roles;
+ rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
+ /*
+ * Note: all this libfc rogue rport code will be removed for
+ * upstream so it fine that this is really ugly and hacky right now.
+ */
+ device_initialize(&rport->dev);
+ rport->dev.release = fc_rport_rogue_destroy;
+
+ mutex_init(&rdata->rp_mutex);
+ rdata->local_port = dp->lp;
+ rdata->trans_state = FC_PORTSTATE_ROGUE;
+ rdata->rp_state = RPORT_ST_INIT;
+ rdata->event = RPORT_EV_NONE;
+ rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+ rdata->ops = NULL;
+ rdata->e_d_tov = dp->lp->e_d_tov;
+ rdata->r_a_tov = dp->lp->r_a_tov;
+ INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
+ INIT_WORK(&rdata->event_work, fc_rport_work);
+ /*
+ * For good measure, but not necessary as we should only
+ * add REAL rport to the lport list.
+ */
+ INIT_LIST_HEAD(&rdata->peers);
+
+ return rport;
+}
+
+/**
+ * fc_rport_state - return a string for the state the rport is in
+ * @rport: The rport whose state we want to get a string for
+ */
+static const char *fc_rport_state(struct fc_rport *rport)
+{
+ const char *cp;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ cp = fc_rport_state_names[rdata->rp_state];
+ if (!cp)
+ cp = "Unknown";
+ return cp;
+}
+
+/**
+ * fc_set_rport_loss_tmo - Set the remote port loss timeout in seconds.
+ * @rport: Pointer to Fibre Channel remote port structure
+ * @timeout: timeout in seconds
+ */
+void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+ if (timeout)
+ rport->dev_loss_tmo = timeout + 5;
+ else
+ rport->dev_loss_tmo = 30;
+}
+EXPORT_SYMBOL(fc_set_rport_loss_tmo);
+
+/**
+ * fc_plogi_get_maxframe - Get max payload from the common service parameters
+ * @flp: FLOGI payload structure
+ * @maxval: upper limit, may be less than what is in the service parameters
+ */
+static unsigned int
+fc_plogi_get_maxframe(struct fc_els_flogi *flp, unsigned int maxval)
+{
+ unsigned int mfs;
+
+ /*
+ * Get max payload from the common service parameters and the
+ * class 3 receive data field size.
+ */
+ mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
+ if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
+ maxval = mfs;
+ mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
+ if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
+ maxval = mfs;
+ return maxval;
+}
+
+/**
+ * fc_rport_state_enter - Change the rport's state
+ * @rport: The rport whose state should change
+ * @new: The new state of the rport
+ *
+ * Locking Note: Called with the rport lock held
+ */
+static void fc_rport_state_enter(struct fc_rport *rport,
+ enum fc_rport_state new)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ if (rdata->rp_state != new)
+ rdata->retries = 0;
+ rdata->rp_state = new;
+}
+
+static void fc_rport_work(struct work_struct *work)
+{
+ struct fc_rport_libfc_priv *rdata =
+ container_of(work, struct fc_rport_libfc_priv, event_work);
+ enum fc_rport_event event;
+ enum fc_rport_trans_state trans_state;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_rport_operations *rport_ops;
+ struct fc_rport *rport = PRIV_TO_RPORT(rdata);
+
+ mutex_lock(&rdata->rp_mutex);
+ event = rdata->event;
+ rport_ops = rdata->ops;
+
+ if (event == RPORT_EV_CREATED) {
+ struct fc_rport *new_rport;
+ struct fc_rport_libfc_priv *new_rdata;
+ struct fc_rport_identifiers ids;
+
+ ids.port_id = rport->port_id;
+ ids.roles = rport->roles;
+ ids.port_name = rport->port_name;
+ ids.node_name = rport->node_name;
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ new_rport = fc_remote_port_add(lport->host, 0, &ids);
+ if (new_rport) {
+ /*
+ * Switch from the rogue rport to the rport
+ * returned by the FC class.
+ */
+ new_rport->maxframe_size = rport->maxframe_size;
+
+ new_rdata = new_rport->dd_data;
+ new_rdata->e_d_tov = rdata->e_d_tov;
+ new_rdata->r_a_tov = rdata->r_a_tov;
+ new_rdata->ops = rdata->ops;
+ new_rdata->local_port = rdata->local_port;
+ new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+ new_rdata->trans_state = FC_PORTSTATE_REAL;
+ mutex_init(&new_rdata->rp_mutex);
+ INIT_DELAYED_WORK(&new_rdata->retry_work,
+ fc_rport_timeout);
+ INIT_LIST_HEAD(&new_rdata->peers);
+ INIT_WORK(&new_rdata->event_work, fc_rport_work);
+
+ fc_rport_state_enter(new_rport, RPORT_ST_READY);
+ } else {
+ FC_DBG("Failed to create the rport for port "
+ "(%6x).\n", ids.port_id);
+ event = RPORT_EV_FAILED;
+ }
+ put_device(&rport->dev);
+ rport = new_rport;
+ rdata = new_rport->dd_data;
+ if (rport_ops->event_callback)
+ rport_ops->event_callback(lport, rport, event);
+ } else if ((event == RPORT_EV_FAILED) ||
+ (event == RPORT_EV_LOGO) ||
+ (event == RPORT_EV_STOP)) {
+ trans_state = rdata->trans_state;
+ mutex_unlock(&rdata->rp_mutex);
+ if (rport_ops->event_callback)
+ rport_ops->event_callback(lport, rport, event);
+ if (trans_state == FC_PORTSTATE_ROGUE)
+ put_device(&rport->dev);
+ else
+ fc_remote_port_delete(rport);
+ } else
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_login - Start the remote port login state machine
+ * @rport: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_login(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Login to port (%6x)\n", rport->port_id);
+
+ fc_rport_enter_plogi(rport);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_logoff - Logoff and remove an rport
+ * @rport: Fibre Channel remote port to be removed
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_logoff(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Remove port (%6x)\n", rport->port_id);
+
+ fc_rport_enter_logo(rport);
+
+ /*
+ * Change the state to NONE so that we discard
+ * the response.
+ */
+ fc_rport_state_enter(rport, RPORT_ST_NONE);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ cancel_delayed_work_sync(&rdata->retry_work);
+
+ mutex_lock(&rdata->rp_mutex);
+
+ rdata->event = RPORT_EV_STOP;
+ queue_work(rport_event_queue, &rdata->event_work);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_enter_ready - The rport is ready
+ * @rport: Fibre Channel remote port that is ready
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_ready(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ fc_rport_state_enter(rport, RPORT_ST_READY);
+
+ FC_DEBUG_RPORT("Port (%6x) is Ready\n", rport->port_id);
+
+ rdata->event = RPORT_EV_CREATED;
+ queue_work(rport_event_queue, &rdata->event_work);
+}
+
+/**
+ * fc_rport_timeout - Handler for the retry_work timer.
+ * @work: The work struct of the fc_rport_libfc_priv
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+static void fc_rport_timeout(struct work_struct *work)
+{
+ struct fc_rport_libfc_priv *rdata =
+ container_of(work, struct fc_rport_libfc_priv, retry_work.work);
+ struct fc_rport *rport = PRIV_TO_RPORT(rdata);
+
+ mutex_lock(&rdata->rp_mutex);
+
+ switch (rdata->rp_state) {
+ case RPORT_ST_PLOGI:
+ fc_rport_enter_plogi(rport);
+ break;
+ case RPORT_ST_PRLI:
+ fc_rport_enter_prli(rport);
+ break;
+ case RPORT_ST_RTV:
+ fc_rport_enter_rtv(rport);
+ break;
+ case RPORT_ST_LOGO:
+ fc_rport_enter_logo(rport);
+ break;
+ case RPORT_ST_READY:
+ case RPORT_ST_INIT:
+ case RPORT_ST_NONE:
+ break;
+ }
+
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_error - Handler for any errors
+ * @rport: The fc_rport object
+ * @fp: The frame pointer
+ *
+ * If the error was caused by a resource allocation failure
+ * then wait for half a second and retry, otherwise retry
+ * immediately.
+ *
+ * Locking Note: The rport lock is expected to be held before
+ * calling this routine
+ */
+static void fc_rport_error(struct fc_rport *rport, struct fc_frame *fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ unsigned long delay = 0;
+
+ FC_DEBUG_RPORT("Error %ld in state %s, retries %d\n",
+ PTR_ERR(fp), fc_rport_state(rport), rdata->retries);
+
+ if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
+ /*
+ * Memory allocation failure, or the exchange timed out.
+ * Retry after delay
+ */
+ if (rdata->retries < rdata->local_port->max_retry_count) {
+ rdata->retries++;
+ if (!fp)
+ delay = msecs_to_jiffies(500);
+ get_device(&rport->dev);
+ schedule_delayed_work(&rdata->retry_work, delay);
+ } else {
+ switch (rdata->rp_state) {
+ case RPORT_ST_PLOGI:
+ case RPORT_ST_PRLI:
+ case RPORT_ST_LOGO:
+ rdata->event = RPORT_EV_FAILED;
+ queue_work(rport_event_queue,
+ &rdata->event_work);
+ break;
+ case RPORT_ST_RTV:
+ fc_rport_enter_ready(rport);
+ break;
+ case RPORT_ST_NONE:
+ case RPORT_ST_READY:
+ case RPORT_ST_INIT:
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * fc_rport_plogi_recv_resp - Handle incoming ELS PLOGI response
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_els_flogi *plp;
+ unsigned int tov;
+ u16 csp_seq;
+ u16 cssp_seq;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a PLOGI response from port (%6x)\n",
+ rport->port_id);
+
+ if (rdata->rp_state != RPORT_ST_PLOGI) {
+ FC_DBG("Received a PLOGI response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC &&
+ (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
+ rport->port_name = get_unaligned_be64(&plp->fl_wwpn);
+ rport->node_name = get_unaligned_be64(&plp->fl_wwnn);
+
+ tov = ntohl(plp->fl_csp.sp_e_d_tov);
+ if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
+ tov /= 1000;
+ if (tov > rdata->e_d_tov)
+ rdata->e_d_tov = tov;
+ csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
+ cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
+ if (cssp_seq < csp_seq)
+ csp_seq = cssp_seq;
+ rdata->max_seq = csp_seq;
+ rport->maxframe_size =
+ fc_plogi_get_maxframe(plp, lport->mfs);
+
+ /*
+ * If the rport is one of the well known addresses
+ * we skip PRLI and RTV and go straight to READY.
+ */
+ if (rport->port_id >= FC_FID_DOM_MGR)
+ fc_rport_enter_ready(rport);
+ else
+ fc_rport_enter_prli(rport);
+ } else
+ fc_rport_error(rport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_plogi - Send Port Login (PLOGI) request to peer
+ * @rport: Fibre Channel remote port to send PLOGI to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_plogi(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered PLOGI state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_PLOGI);
+
+ rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+ rdata->e_d_tov = lport->e_d_tov;
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_PLOGI,
+ fc_rport_plogi_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+/**
+ * fc_rport_prli_resp - Process Login (PRLI) response handler
+ * @sp: current sequence in the PRLI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ u32 roles = FC_RPORT_ROLE_UNKNOWN;
+ u32 fcp_parm = 0;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a PRLI response from port (%6x)\n",
+ rport->port_id);
+
+ if (rdata->rp_state != RPORT_ST_PRLI) {
+ FC_DBG("Received a PRLI response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ pp = fc_frame_payload_get(fp, sizeof(*pp));
+ if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
+ fcp_parm = ntohl(pp->spp.spp_params);
+ if (fcp_parm & FCP_SPPF_RETRY)
+ rdata->flags |= FC_RP_FLAGS_RETRY;
+ }
+
+ rport->supported_classes = FC_COS_CLASS3;
+ if (fcp_parm & FCP_SPPF_INIT_FCN)
+ roles |= FC_RPORT_ROLE_FCP_INITIATOR;
+ if (fcp_parm & FCP_SPPF_TARG_FCN)
+ roles |= FC_RPORT_ROLE_FCP_TARGET;
+
+ rport->roles = roles;
+ fc_rport_enter_rtv(rport);
+
+ } else {
+ FC_DBG("Bad ELS response\n");
+ rdata->event = RPORT_EV_FAILED;
+ queue_work(rport_event_queue, &rdata->event_work);
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_logo_resp - Logout (LOGO) response handler
+ * @sp: current sequence in the LOGO exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a LOGO response from port (%6x)\n",
+ rport->port_id);
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ if (rdata->rp_state != RPORT_ST_LOGO) {
+ FC_DEBUG_RPORT("Received a LOGO response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ fc_rport_enter_rtv(rport);
+ } else {
+ FC_DBG("Bad ELS response\n");
+ rdata->event = RPORT_EV_LOGO;
+ queue_work(rport_event_queue, &rdata->event_work);
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_prli - Send Process Login (PRLI) request to peer
+ * @rport: Fibre Channel remote port to send PRLI to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_prli(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered PRLI state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_PRLI);
+
+ fp = fc_frame_alloc(lport, sizeof(*pp));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_PRLI,
+ fc_rport_prli_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+/**
+ * fc_rport_els_rtv_resp - Request Timeout Value response handler
+ * @sp: current sequence in the RTV exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Many targets don't seem to support this.
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a RTV response from port (%6x)\n",
+ rport->port_id);
+
+ if (rdata->rp_state != RPORT_ST_RTV) {
+ FC_DBG("Received a RTV response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ struct fc_els_rtv_acc *rtv;
+ u32 toq;
+ u32 tov;
+
+ rtv = fc_frame_payload_get(fp, sizeof(*rtv));
+ if (rtv) {
+ toq = ntohl(rtv->rtv_toq);
+ tov = ntohl(rtv->rtv_r_a_tov);
+ if (tov == 0)
+ tov = 1;
+ rdata->r_a_tov = tov;
+ tov = ntohl(rtv->rtv_e_d_tov);
+ if (toq & FC_ELS_RTV_EDRES)
+ tov /= 1000000;
+ if (tov == 0)
+ tov = 1;
+ rdata->e_d_tov = tov;
+ }
+ }
+
+ fc_rport_enter_ready(rport);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+ put_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_rtv - Send Request Timeout Value (RTV) request to peer
+ * @rport: Fibre Channel remote port to send RTV to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_rtv(struct fc_rport *rport)
+{
+ struct fc_frame *fp;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ FC_DEBUG_RPORT("Port (%6x) entered RTV state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_RTV);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_RTV,
+ fc_rport_rtv_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+/**
+ * fc_rport_enter_logo - Send Logout (LOGO) request to peer
+ * @rport: Fibre Channel remote port to send LOGO to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_logo(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered LOGO state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_LOGO);
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, rport, fp, ELS_LOGO,
+ fc_rport_logo_resp, rport, lport->e_d_tov))
+ fc_rport_error(rport, fp);
+ else
+ get_device(&rport->dev);
+}
+
+
+/**
+ * fc_rport_recv_req - Receive a request from a rport
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame_header *fh;
+ struct fc_seq_els_data els_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ els_data.fp = NULL;
+ els_data.explan = ELS_EXPL_NONE;
+ els_data.reason = ELS_RJT_NONE;
+
+ fh = fc_frame_header_get(fp);
+
+ if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) {
+ op = fc_frame_payload_op(fp);
+ switch (op) {
+ case ELS_PLOGI:
+ fc_rport_recv_plogi_req(rport, sp, fp);
+ break;
+ case ELS_PRLI:
+ fc_rport_recv_prli_req(rport, sp, fp);
+ break;
+ case ELS_PRLO:
+ fc_rport_recv_prlo_req(rport, sp, fp);
+ break;
+ case ELS_LOGO:
+ fc_rport_recv_logo_req(rport, sp, fp);
+ break;
+ case ELS_RRQ:
+ els_data.fp = fp;
+ lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
+ break;
+ case ELS_REC:
+ els_data.fp = fp;
+ lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
+ break;
+ default:
+ els_data.reason = ELS_RJT_UNSUP;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
+ break;
+ }
+ }
+
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_recv_plogi_req - Handle incoming Port Login (PLOGI) request
+ * @rport: Fibre Channel remote port that initiated PLOGI
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: PLOGI request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_plogi_req(struct fc_rport *rport,
+ struct fc_seq *sp, struct fc_frame *rx_fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp = rx_fp;
+ struct fc_exch *ep;
+ struct fc_frame_header *fh;
+ struct fc_els_flogi *pl;
+ struct fc_seq_els_data rjt_data;
+ u32 sid;
+ u64 wwpn;
+ u64 wwnn;
+ enum fc_els_rjt_reason reject = 0;
+ u32 f_ctl;
+ rjt_data.fp = NULL;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received PLOGI request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ sid = ntoh24(fh->fh_s_id);
+ pl = fc_frame_payload_get(fp, sizeof(*pl));
+ if (!pl) {
+ FC_DBG("incoming PLOGI from %x too short\n", sid);
+ WARN_ON(1);
+ /* XXX TBD: send reject? */
+ fc_frame_free(fp);
+ return;
+ }
+ wwpn = get_unaligned_be64(&pl->fl_wwpn);
+ wwnn = get_unaligned_be64(&pl->fl_wwnn);
+
+ /*
+ * If the session was just created, possibly due to the incoming PLOGI,
+ * set the state appropriately and accept the PLOGI.
+ *
+ * If we had also sent a PLOGI, and if the received PLOGI is from a
+ * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
+ * "command already in progress".
+ *
+ * XXX TBD: If the session was ready before, the PLOGI should result in
+ * all outstanding exchanges being reset.
+ */
+ switch (rdata->rp_state) {
+ case RPORT_ST_INIT:
+ FC_DEBUG_RPORT("incoming PLOGI from %6x wwpn %llx state INIT "
+ "- reject\n", sid, wwpn);
+ reject = ELS_RJT_UNSUP;
+ break;
+ case RPORT_ST_PLOGI:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in PLOGI state %d\n",
+ sid, rdata->rp_state);
+ if (wwpn < lport->wwpn)
+ reject = ELS_RJT_INPROG;
+ break;
+ case RPORT_ST_PRLI:
+ case RPORT_ST_READY:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in logged-in state %d "
+ "- ignored for now\n", sid, rdata->rp_state);
+ /* XXX TBD - should reset */
+ break;
+ case RPORT_ST_NONE:
+ default:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in unexpected "
+ "state %d\n", sid, rdata->rp_state);
+ break;
+ }
+
+ if (reject) {
+ rjt_data.reason = reject;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+ } else {
+ fp = fc_frame_alloc(lport, sizeof(*pl));
+ if (fp == NULL) {
+ fp = rx_fp;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+ } else {
+ sp = lport->tt.seq_start_next(sp);
+ WARN_ON(!sp);
+ fc_rport_set_name(rport, wwpn, wwnn);
+
+ /*
+ * Get session payload size from incoming PLOGI.
+ */
+ rport->maxframe_size =
+ fc_plogi_get_maxframe(pl, lport->mfs);
+ fc_frame_free(rx_fp);
+ fc_plogi_fill(lport, fp, ELS_LS_ACC);
+
+ /*
+ * Send LS_ACC. If this fails,
+ * the originator should retry.
+ */
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
+ f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ ep = fc_seq_exch(sp);
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+ if (rdata->rp_state == RPORT_ST_PLOGI)
+ fc_rport_enter_prli(rport);
+ }
+ }
+}
+
+/**
+ * fc_rport_recv_prli_req - Handle incoming Process Login (PRLI) request
+ * @rport: Fibre Channel remote port that initiated PRLI
+ * @sp: current sequence in the PRLI exchange
+ * @fp: PRLI request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_prli_req(struct fc_rport *rport,
+ struct fc_seq *sp, struct fc_frame *rx_fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_exch *ep;
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ struct fc_els_spp *rspp; /* request service param page */
+ struct fc_els_spp *spp; /* response spp */
+ unsigned int len;
+ unsigned int plen;
+ enum fc_els_rjt_reason reason = ELS_RJT_UNAB;
+ enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
+ enum fc_els_spp_resp resp;
+ struct fc_seq_els_data rjt_data;
+ u32 f_ctl;
+ u32 fcp_parm;
+ u32 roles = FC_RPORT_ROLE_UNKNOWN;
+ rjt_data.fp = NULL;
+
+ fh = fc_frame_header_get(rx_fp);
+
+ FC_DEBUG_RPORT("Received PRLI request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ switch (rdata->rp_state) {
+ case RPORT_ST_PRLI:
+ case RPORT_ST_READY:
+ reason = ELS_RJT_NONE;
+ break;
+ default:
+ break;
+ }
+ len = fr_len(rx_fp) - sizeof(*fh);
+ pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
+ if (pp == NULL) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ } else {
+ plen = ntohs(pp->prli.prli_len);
+ if ((plen % 4) != 0 || plen > len) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ } else if (plen < len) {
+ len = plen;
+ }
+ plen = pp->prli.prli_spp_len;
+ if ((plen % 4) != 0 || plen < sizeof(*spp) ||
+ plen > len || len < sizeof(*pp)) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ }
+ rspp = &pp->spp;
+ }
+ if (reason != ELS_RJT_NONE ||
+ (fp = fc_frame_alloc(lport, len)) == NULL) {
+ rjt_data.reason = reason;
+ rjt_data.explan = explan;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ } else {
+ sp = lport->tt.seq_start_next(sp);
+ WARN_ON(!sp);
+ pp = fc_frame_payload_get(fp, len);
+ WARN_ON(!pp);
+ memset(pp, 0, len);
+ pp->prli.prli_cmd = ELS_LS_ACC;
+ pp->prli.prli_spp_len = plen;
+ pp->prli.prli_len = htons(len);
+ len -= sizeof(struct fc_els_prli);
+
+ /*
+ * Go through all the service parameter pages and build
+ * response. If plen indicates longer SPP than standard,
+ * use that. The entire response has been pre-cleared above.
+ */
+ spp = &pp->spp;
+ while (len >= plen) {
+ spp->spp_type = rspp->spp_type;
+ spp->spp_type_ext = rspp->spp_type_ext;
+ spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
+ resp = FC_SPP_RESP_ACK;
+ if (rspp->spp_flags & FC_SPP_RPA_VAL)
+ resp = FC_SPP_RESP_NO_PA;
+ switch (rspp->spp_type) {
+ case 0: /* common to all FC-4 types */
+ break;
+ case FC_TYPE_FCP:
+ fcp_parm = ntohl(rspp->spp_params);
+ if (fcp_parm * FCP_SPPF_RETRY)
+ rdata->flags |= FC_RP_FLAGS_RETRY;
+ rport->supported_classes = FC_COS_CLASS3;
+ if (fcp_parm & FCP_SPPF_INIT_FCN)
+ roles |= FC_RPORT_ROLE_FCP_INITIATOR;
+ if (fcp_parm & FCP_SPPF_TARG_FCN)
+ roles |= FC_RPORT_ROLE_FCP_TARGET;
+ rport->roles = roles;
+
+ spp->spp_params =
+ htonl(lport->service_params);
+ break;
+ default:
+ resp = FC_SPP_RESP_INVL;
+ break;
+ }
+ spp->spp_flags |= resp;
+ len -= plen;
+ rspp = (struct fc_els_spp *)((char *)rspp + plen);
+ spp = (struct fc_els_spp *)((char *)spp + plen);
+ }
+
+ /*
+ * Send LS_ACC. If this fails, the originator should retry.
+ */
+ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
+ f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
+ ep = fc_seq_exch(sp);
+ fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
+ FC_TYPE_ELS, f_ctl, 0);
+ lport->tt.seq_send(lport, sp, fp);
+
+ /*
+ * Get lock and re-check state.
+ */
+ switch (rdata->rp_state) {
+ case RPORT_ST_PRLI:
+ fc_rport_enter_ready(rport);
+ break;
+ case RPORT_ST_READY:
+ break;
+ default:
+ break;
+ }
+ }
+ fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_recv_prlo_req - Handle incoming Process Logout (PRLO) request
+ * @rport: Fibre Channel remote port that initiated PRLO
+ * @sp: current sequence in the PRLO exchange
+ * @fp: PRLO request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_prlo_req(struct fc_rport *rport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame_header *fh;
+ struct fc_seq_els_data rjt_data;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received PRLO request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_rport_recv_logo_req - Handle incoming Logout (LOGO) request
+ * @rport: Fibre Channel remote port that initiated LOGO
+ * @sp: current sequence in the LOGO exchange
+ * @fp: LOGO request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_logo_req(struct fc_rport *rport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received LOGO request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ rdata->event = RPORT_EV_LOGO;
+ queue_work(rport_event_queue, &rdata->event_work);
+
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_frame_free(fp);
+}
+
+static void fc_rport_flush_queue(void)
+{
+ flush_workqueue(rport_event_queue);
+}
+
+
+int fc_rport_init(struct fc_lport *lport)
+{
+ if (!lport->tt.rport_login)
+ lport->tt.rport_login = fc_rport_login;
+
+ if (!lport->tt.rport_logoff)
+ lport->tt.rport_logoff = fc_rport_logoff;
+
+ if (!lport->tt.rport_recv_req)
+ lport->tt.rport_recv_req = fc_rport_recv_req;
+
+ if (!lport->tt.rport_flush_queue)
+ lport->tt.rport_flush_queue = fc_rport_flush_queue;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_rport_init);
+
+int fc_setup_rport()
+{
+ rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
+ if (!rport_event_queue)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL(fc_setup_rport);
+
+void fc_destroy_rport()
+{
+ destroy_workqueue(rport_event_queue);
+}
+EXPORT_SYMBOL(fc_destroy_rport);
+
+void fc_rport_terminate_io(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ lport->tt.exch_mgr_reset(lport->emp, 0, rport->port_id);
+ lport->tt.exch_mgr_reset(lport->emp, rport->port_id, 0);
+}
+EXPORT_SYMBOL(fc_rport_terminate_io);
--- /dev/null
+/*
+ * Copyright(c) 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_ENCODE_H_
+#define _FC_ENCODE_H_
+#include <asm/unaligned.h>
+
+struct fc_ns_rft {
+ struct fc_ns_fid fid; /* port ID object */
+ struct fc_ns_fts fts; /* FC4-types object */
+};
+
+struct fc_ct_req {
+ struct fc_ct_hdr hdr;
+ union {
+ struct fc_ns_gid_ft gid;
+ struct fc_ns_rn_id rn;
+ struct fc_ns_rft rft;
+ } payload;
+};
+
+/**
+ * fill FC header fields in specified fc_frame
+ */
+static inline void fc_fill_fc_hdr(struct fc_frame *fp, enum fc_rctl r_ctl,
+ u32 did, u32 sid, enum fc_fh_type type,
+ u32 f_ctl, u32 parm_offset)
+{
+ struct fc_frame_header *fh;
+
+ fh = fc_frame_header_get(fp);
+ WARN_ON(r_ctl == 0);
+ fh->fh_r_ctl = r_ctl;
+ hton24(fh->fh_d_id, did);
+ hton24(fh->fh_s_id, sid);
+ fh->fh_type = type;
+ hton24(fh->fh_f_ctl, f_ctl);
+ fh->fh_cs_ctl = 0;
+ fh->fh_df_ctl = 0;
+ fh->fh_parm_offset = htonl(parm_offset);
+}
+
+/**
+ * fc_ct_hdr_fill- fills ct header and reset ct payload
+ * returns pointer to ct request.
+ */
+static inline struct fc_ct_req *fc_ct_hdr_fill(const struct fc_frame *fp,
+ unsigned int op, size_t req_size)
+{
+ struct fc_ct_req *ct;
+ size_t ct_plen;
+
+ ct_plen = sizeof(struct fc_ct_hdr) + req_size;
+ ct = fc_frame_payload_get(fp, ct_plen);
+ memset(ct, 0, ct_plen);
+ ct->hdr.ct_rev = FC_CT_REV;
+ ct->hdr.ct_fs_type = FC_FST_DIR;
+ ct->hdr.ct_fs_subtype = FC_NS_SUBTYPE;
+ ct->hdr.ct_cmd = htons((u16) op);
+ return ct;
+}
+
+/**
+ * fc_ct_fill - Fill in a name service request frame
+ */
+static inline int fc_ct_fill(struct fc_lport *lport, struct fc_frame *fp,
+ unsigned int op, enum fc_rctl *r_ctl, u32 *did,
+ enum fc_fh_type *fh_type)
+{
+ struct fc_ct_req *ct;
+
+ switch (op) {
+ case FC_NS_GPN_FT:
+ ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_gid_ft));
+ ct->payload.gid.fn_fc4_type = FC_TYPE_FCP;
+ break;
+
+ case FC_NS_RFT_ID:
+ ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rft));
+ hton24(ct->payload.rft.fid.fp_fid,
+ fc_host_port_id(lport->host));
+ ct->payload.rft.fts = lport->fcts;
+ break;
+
+ case FC_NS_RPN_ID:
+ ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rn_id));
+ hton24(ct->payload.rn.fr_fid.fp_fid,
+ fc_host_port_id(lport->host));
+ ct->payload.rft.fts = lport->fcts;
+ put_unaligned_be64(lport->wwpn, &ct->payload.rn.fr_wwn);
+ break;
+
+ default:
+ FC_DBG("Invalid op code %x \n", op);
+ return -EINVAL;
+ }
+ *r_ctl = FC_RCTL_DD_UNSOL_CTL;
+ *did = FC_FID_DIR_SERV;
+ *fh_type = FC_TYPE_CT;
+ return 0;
+}
+
+/**
+ * fc_plogi_fill - Fill in plogi request frame
+ */
+static inline void fc_plogi_fill(struct fc_lport *lport, struct fc_frame *fp,
+ unsigned int op)
+{
+ struct fc_els_flogi *plogi;
+ struct fc_els_csp *csp;
+ struct fc_els_cssp *cp;
+
+ plogi = fc_frame_payload_get(fp, sizeof(*plogi));
+ memset(plogi, 0, sizeof(*plogi));
+ plogi->fl_cmd = (u8) op;
+ put_unaligned_be64(lport->wwpn, &plogi->fl_wwpn);
+ put_unaligned_be64(lport->wwnn, &plogi->fl_wwnn);
+
+ csp = &plogi->fl_csp;
+ csp->sp_hi_ver = 0x20;
+ csp->sp_lo_ver = 0x20;
+ csp->sp_bb_cred = htons(10); /* this gets set by gateway */
+ csp->sp_bb_data = htons((u16) lport->mfs);
+ cp = &plogi->fl_cssp[3 - 1]; /* class 3 parameters */
+ cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
+ csp->sp_features = htons(FC_SP_FT_CIRO);
+ csp->sp_tot_seq = htons(255); /* seq. we accept */
+ csp->sp_rel_off = htons(0x1f);
+ csp->sp_e_d_tov = htonl(lport->e_d_tov);
+
+ cp->cp_rdfs = htons((u16) lport->mfs);
+ cp->cp_con_seq = htons(255);
+ cp->cp_open_seq = 1;
+}
+
+/**
+ * fc_flogi_fill - Fill in a flogi request frame.
+ */
+static inline void fc_flogi_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct fc_els_csp *sp;
+ struct fc_els_cssp *cp;
+ struct fc_els_flogi *flogi;
+
+ flogi = fc_frame_payload_get(fp, sizeof(*flogi));
+ memset(flogi, 0, sizeof(*flogi));
+ flogi->fl_cmd = (u8) ELS_FLOGI;
+ put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
+ put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
+ sp = &flogi->fl_csp;
+ sp->sp_hi_ver = 0x20;
+ sp->sp_lo_ver = 0x20;
+ sp->sp_bb_cred = htons(10); /* this gets set by gateway */
+ sp->sp_bb_data = htons((u16) lport->mfs);
+ cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
+ cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
+}
+
+/**
+ * fc_logo_fill - Fill in a logo request frame.
+ */
+static inline void fc_logo_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct fc_els_logo *logo;
+
+ logo = fc_frame_payload_get(fp, sizeof(*logo));
+ memset(logo, 0, sizeof(*logo));
+ logo->fl_cmd = ELS_LOGO;
+ hton24(logo->fl_n_port_id, fc_host_port_id(lport->host));
+ logo->fl_n_port_wwn = htonll(lport->wwpn);
+}
+
+/**
+ * fc_rtv_fill - Fill in RTV (read timeout value) request frame.
+ */
+static inline void fc_rtv_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct fc_els_rtv *rtv;
+
+ rtv = fc_frame_payload_get(fp, sizeof(*rtv));
+ memset(rtv, 0, sizeof(*rtv));
+ rtv->rtv_cmd = ELS_RTV;
+}
+
+/**
+ * fc_rec_fill - Fill in rec request frame
+ */
+static inline void fc_rec_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct fc_els_rec *rec;
+ struct fc_exch *ep = fc_seq_exch(fr_seq(fp));
+
+ rec = fc_frame_payload_get(fp, sizeof(*rec));
+ memset(rec, 0, sizeof(*rec));
+ rec->rec_cmd = ELS_REC;
+ hton24(rec->rec_s_id, fc_host_port_id(lport->host));
+ rec->rec_ox_id = htons(ep->oxid);
+ rec->rec_rx_id = htons(ep->rxid);
+}
+
+/**
+ * fc_prli_fill - Fill in prli request frame
+ */
+static inline void fc_prli_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+
+ pp = fc_frame_payload_get(fp, sizeof(*pp));
+ memset(pp, 0, sizeof(*pp));
+ pp->prli.prli_cmd = ELS_PRLI;
+ pp->prli.prli_spp_len = sizeof(struct fc_els_spp);
+ pp->prli.prli_len = htons(sizeof(*pp));
+ pp->spp.spp_type = FC_TYPE_FCP;
+ pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR;
+ pp->spp.spp_params = htonl(lport->service_params);
+}
+
+/**
+ * fc_scr_fill - Fill in a scr request frame.
+ */
+static inline void fc_scr_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+ struct fc_els_scr *scr;
+
+ scr = fc_frame_payload_get(fp, sizeof(*scr));
+ memset(scr, 0, sizeof(*scr));
+ scr->scr_cmd = ELS_SCR;
+ scr->scr_reg_func = ELS_SCRF_FULL;
+}
+
+/**
+ * fc_els_fill - Fill in an ELS request frame
+ */
+static inline int fc_els_fill(struct fc_lport *lport, struct fc_rport *rport,
+ struct fc_frame *fp, unsigned int op,
+ enum fc_rctl *r_ctl, u32 *did, enum fc_fh_type *fh_type)
+{
+ switch (op) {
+ case ELS_PLOGI:
+ fc_plogi_fill(lport, fp, ELS_PLOGI);
+ *did = rport->port_id;
+ break;
+
+ case ELS_FLOGI:
+ fc_flogi_fill(lport, fp);
+ *did = FC_FID_FLOGI;
+ break;
+
+ case ELS_LOGO:
+ fc_logo_fill(lport, fp);
+ *did = FC_FID_FLOGI;
+ /*
+ * if rport is valid then it
+ * is port logo, therefore
+ * set did to rport id.
+ */
+ if (rport)
+ *did = rport->port_id;
+ break;
+
+ case ELS_RTV:
+ fc_rtv_fill(lport, fp);
+ *did = rport->port_id;
+ break;
+
+ case ELS_REC:
+ fc_rec_fill(lport, fp);
+ *did = rport->port_id;
+ break;
+
+ case ELS_PRLI:
+ fc_prli_fill(lport, fp);
+ *did = rport->port_id;
+ break;
+
+ case ELS_SCR:
+ fc_scr_fill(lport, fp);
+ *did = FC_FID_FCTRL;
+ break;
+
+ default:
+ FC_DBG("Invalid op code %x \n", op);
+ return -EINVAL;
+ }
+
+ *r_ctl = FC_RCTL_ELS_REQ;
+ *fh_type = FC_TYPE_ELS;
+ return 0;
+}
+#endif /* _FC_ENCODE_H_ */
--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_FRAME_H_
+#define _FC_FRAME_H_
+
+#include <linux/scatterlist.h>
+#include <linux/skbuff.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <scsi/fc/fc_fs.h>
+#include <scsi/fc/fc_fcp.h>
+#include <scsi/fc/fc_encaps.h>
+
+/*
+ * The fc_frame interface is used to pass frame data between functions.
+ * The frame includes the data buffer, length, and SOF / EOF delimiter types.
+ * A pointer to the port structure of the receiving port is also includeded.
+ */
+
+#define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */
+#define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */
+
+/*
+ * Information about an individual fibre channel frame received or to be sent.
+ * The buffer may be in up to 4 additional non-contiguous sections,
+ * but the linear section must hold the frame header.
+ */
+#define FC_FRAME_SG_LEN 4 /* scatter/gather list maximum length */
+
+#define fp_skb(fp) (&((fp)->skb))
+#define fr_hdr(fp) ((fp)->skb.data)
+#define fr_len(fp) ((fp)->skb.len)
+#define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0]))
+#define fr_dev(fp) (fr_cb(fp)->fr_dev)
+#define fr_seq(fp) (fr_cb(fp)->fr_seq)
+#define fr_sof(fp) (fr_cb(fp)->fr_sof)
+#define fr_eof(fp) (fr_cb(fp)->fr_eof)
+#define fr_flags(fp) (fr_cb(fp)->fr_flags)
+#define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload)
+#define fr_cmd(fp) (fr_cb(fp)->fr_cmd)
+#define fr_dir(fp) (fr_cmd(fp)->sc_data_direction)
+#define fr_crc(fp) (fr_cb(fp)->fr_crc)
+
+struct fc_frame {
+ struct sk_buff skb;
+};
+
+struct fcoe_rcv_info {
+ struct packet_type *ptype;
+ struct fc_lport *fr_dev; /* transport layer private pointer */
+ struct fc_seq *fr_seq; /* for use with exchange manager */
+ struct scsi_cmnd *fr_cmd; /* for use of scsi command */
+ u32 fr_crc;
+ u16 fr_max_payload; /* max FC payload */
+ enum fc_sof fr_sof; /* start of frame delimiter */
+ enum fc_eof fr_eof; /* end of frame delimiter */
+ u8 fr_flags; /* flags - see below */
+};
+
+
+/*
+ * Get fc_frame pointer for an skb that's already been imported.
+ */
+static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb)
+{
+ BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb));
+ return (struct fcoe_rcv_info *) skb->cb;
+}
+
+/*
+ * fr_flags.
+ */
+#define FCPHF_CRC_UNCHECKED 0x01 /* CRC not computed, still appended */
+
+/*
+ * Initialize a frame.
+ * We don't do a complete memset here for performance reasons.
+ * The caller must set fr_free, fr_hdr, fr_len, fr_sof, and fr_eof eventually.
+ */
+static inline void fc_frame_init(struct fc_frame *fp)
+{
+ fr_dev(fp) = NULL;
+ fr_seq(fp) = NULL;
+ fr_flags(fp) = 0;
+}
+
+struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
+
+struct fc_frame *__fc_frame_alloc(size_t payload_len);
+
+/*
+ * Get frame for sending via port.
+ */
+static inline struct fc_frame *_fc_frame_alloc(struct fc_lport *dev,
+ size_t payload_len)
+{
+ return __fc_frame_alloc(payload_len);
+}
+
+/*
+ * Allocate fc_frame structure and buffer. Set the initial length to
+ * payload_size + sizeof (struct fc_frame_header).
+ */
+static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
+{
+ struct fc_frame *fp;
+
+ /*
+ * Note: Since len will often be a constant multiple of 4,
+ * this check will usually be evaluated and eliminated at compile time.
+ */
+ if ((len % 4) != 0)
+ fp = fc_frame_alloc_fill(dev, len);
+ else
+ fp = _fc_frame_alloc(dev, len);
+ return fp;
+}
+
+/*
+ * Free the fc_frame structure and buffer.
+ */
+static inline void fc_frame_free(struct fc_frame *fp)
+{
+ kfree_skb(fp_skb(fp));
+}
+
+static inline int fc_frame_is_linear(struct fc_frame *fp)
+{
+ return !skb_is_nonlinear(fp_skb(fp));
+}
+
+/*
+ * Get frame header from message in fc_frame structure.
+ * This hides a cast and provides a place to add some checking.
+ */
+static inline
+struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp)
+{
+ WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header));
+ return (struct fc_frame_header *) fr_hdr(fp);
+}
+
+/*
+ * Get frame payload from message in fc_frame structure.
+ * This hides a cast and provides a place to add some checking.
+ * The len parameter is the minimum length for the payload portion.
+ * Returns NULL if the frame is too short.
+ *
+ * This assumes the interesting part of the payload is in the first part
+ * of the buffer for received data. This may not be appropriate to use for
+ * buffers being transmitted.
+ */
+static inline void *fc_frame_payload_get(const struct fc_frame *fp,
+ size_t len)
+{
+ void *pp = NULL;
+
+ if (fr_len(fp) >= sizeof(struct fc_frame_header) + len)
+ pp = fc_frame_header_get(fp) + 1;
+ return pp;
+}
+
+/*
+ * Get frame payload opcode (first byte) from message in fc_frame structure.
+ * This hides a cast and provides a place to add some checking. Return 0
+ * if the frame has no payload.
+ */
+static inline u8 fc_frame_payload_op(const struct fc_frame *fp)
+{
+ u8 *cp;
+
+ cp = fc_frame_payload_get(fp, sizeof(u8));
+ if (!cp)
+ return 0;
+ return *cp;
+
+}
+
+/*
+ * Get FC class from frame.
+ */
+static inline enum fc_class fc_frame_class(const struct fc_frame *fp)
+{
+ return fc_sof_class(fr_sof(fp));
+}
+
+/*
+ * Check the CRC in a frame.
+ * The CRC immediately follows the last data item *AFTER* the length.
+ * The return value is zero if the CRC matches.
+ */
+u32 fc_frame_crc_check(struct fc_frame *);
+
+static inline u8 fc_frame_rctl(const struct fc_frame *fp)
+{
+ return fc_frame_header_get(fp)->fh_r_ctl;
+}
+
+static inline bool fc_frame_is_cmd(const struct fc_frame *fp)
+{
+ return fc_frame_rctl(fp) == FC_RCTL_DD_UNSOL_CMD;
+}
+
+static inline bool fc_frame_is_read(const struct fc_frame *fp)
+{
+ if (fc_frame_is_cmd(fp) && fr_cmd(fp))
+ return fr_dir(fp) == DMA_FROM_DEVICE;
+ return false;
+}
+
+static inline bool fc_frame_is_write(const struct fc_frame *fp)
+{
+ if (fc_frame_is_cmd(fp) && fr_cmd(fp))
+ return fr_dir(fp) == DMA_TO_DEVICE;
+ return false;
+}
+
+/*
+ * Check for leaks.
+ * Print the frame header of any currently allocated frame, assuming there
+ * should be none at this point.
+ */
+void fc_frame_leak_check(void);
+
+#endif /* _FC_FRAME_H_ */
--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _LIBFC_H_
+#define _LIBFC_H_
+
+#include <linux/timer.h>
+#include <linux/if.h>
+
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
+
+#include <scsi/fc/fc_fcp.h>
+#include <scsi/fc/fc_ns.h>
+#include <scsi/fc/fc_els.h>
+#include <scsi/fc/fc_gs.h>
+
+#include <scsi/fc_frame.h>
+
+#define LIBFC_DEBUG
+
+#ifdef LIBFC_DEBUG
+/* Log messages */
+#define FC_DBG(fmt, args...) \
+ do { \
+ printk(KERN_INFO "%s " fmt, __func__, ##args); \
+ } while (0)
+#else
+#define FC_DBG(fmt, args...)
+#endif
+
+/*
+ * libfc error codes
+ */
+#define FC_NO_ERR 0 /* no error */
+#define FC_EX_TIMEOUT 1 /* Exchange timeout */
+#define FC_EX_CLOSED 2 /* Exchange closed */
+
+/* some helpful macros */
+
+#define ntohll(x) be64_to_cpu(x)
+#define htonll(x) cpu_to_be64(x)
+
+#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
+
+#define hton24(p, v) do { \
+ p[0] = (((v) >> 16) & 0xFF); \
+ p[1] = (((v) >> 8) & 0xFF); \
+ p[2] = ((v) & 0xFF); \
+ } while (0)
+
+/*
+ * FC HBA status
+ */
+#define FC_PAUSE (1 << 1)
+#define FC_LINK_UP (1 << 0)
+
+enum fc_lport_state {
+ LPORT_ST_NONE = 0,
+ LPORT_ST_FLOGI,
+ LPORT_ST_DNS,
+ LPORT_ST_RPN_ID,
+ LPORT_ST_RFT_ID,
+ LPORT_ST_SCR,
+ LPORT_ST_READY,
+ LPORT_ST_LOGO,
+ LPORT_ST_RESET
+};
+
+enum fc_disc_event {
+ DISC_EV_NONE = 0,
+ DISC_EV_SUCCESS,
+ DISC_EV_FAILED
+};
+
+enum fc_rport_state {
+ RPORT_ST_NONE = 0,
+ RPORT_ST_INIT, /* initialized */
+ RPORT_ST_PLOGI, /* waiting for PLOGI completion */
+ RPORT_ST_PRLI, /* waiting for PRLI completion */
+ RPORT_ST_RTV, /* waiting for RTV completion */
+ RPORT_ST_READY, /* ready for use */
+ RPORT_ST_LOGO, /* port logout sent */
+};
+
+enum fc_rport_trans_state {
+ FC_PORTSTATE_ROGUE,
+ FC_PORTSTATE_REAL,
+};
+
+/**
+ * struct fc_disc_port - temporary discovery port to hold rport identifiers
+ * @lp: Fibre Channel host port instance
+ * @peers: node for list management during discovery and RSCN processing
+ * @ids: identifiers structure to pass to fc_remote_port_add()
+ * @rport_work: work struct for starting the rport state machine
+ */
+struct fc_disc_port {
+ struct fc_lport *lp;
+ struct list_head peers;
+ struct fc_rport_identifiers ids;
+ struct work_struct rport_work;
+};
+
+enum fc_rport_event {
+ RPORT_EV_NONE = 0,
+ RPORT_EV_CREATED,
+ RPORT_EV_FAILED,
+ RPORT_EV_STOP,
+ RPORT_EV_LOGO
+};
+
+struct fc_rport_operations {
+ void (*event_callback)(struct fc_lport *, struct fc_rport *,
+ enum fc_rport_event);
+};
+
+/**
+ * struct fc_rport_libfc_priv - libfc internal information about a remote port
+ * @local_port: Fibre Channel host port instance
+ * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
+ * @flags: REC and RETRY supported flags
+ * @max_seq: maximum number of concurrent sequences
+ * @retries: retry count in current state
+ * @e_d_tov: error detect timeout value (in msec)
+ * @r_a_tov: resource allocation timeout value (in msec)
+ * @rp_mutex: mutex protects rport
+ * @retry_work:
+ * @event_callback: Callback for rport READY, FAILED or LOGO
+ */
+struct fc_rport_libfc_priv {
+ struct fc_lport *local_port;
+ enum fc_rport_state rp_state;
+ u16 flags;
+ #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
+ #define FC_RP_FLAGS_RETRY (1 << 1)
+ u16 max_seq;
+ unsigned int retries;
+ unsigned int e_d_tov;
+ unsigned int r_a_tov;
+ enum fc_rport_trans_state trans_state;
+ struct mutex rp_mutex;
+ struct delayed_work retry_work;
+ enum fc_rport_event event;
+ struct fc_rport_operations *ops;
+ struct list_head peers;
+ struct work_struct event_work;
+};
+
+#define PRIV_TO_RPORT(x) \
+ (struct fc_rport *)((void *)x - sizeof(struct fc_rport));
+#define RPORT_TO_PRIV(x) \
+ (struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport));
+
+struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *);
+
+static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
+{
+ rport->node_name = wwnn;
+ rport->port_name = wwpn;
+}
+
+/*
+ * fcoe stats structure
+ */
+struct fcoe_dev_stats {
+ u64 SecondsSinceLastReset;
+ u64 TxFrames;
+ u64 TxWords;
+ u64 RxFrames;
+ u64 RxWords;
+ u64 ErrorFrames;
+ u64 DumpedFrames;
+ u64 LinkFailureCount;
+ u64 LossOfSignalCount;
+ u64 InvalidTxWordCount;
+ u64 InvalidCRCCount;
+ u64 InputRequests;
+ u64 OutputRequests;
+ u64 ControlRequests;
+ u64 InputMegabytes;
+ u64 OutputMegabytes;
+};
+
+/*
+ * els data is used for passing ELS respone specific
+ * data to send ELS response mainly using infomation
+ * in exchange and sequence in EM layer.
+ */
+struct fc_seq_els_data {
+ struct fc_frame *fp;
+ enum fc_els_rjt_reason reason;
+ enum fc_els_rjt_explan explan;
+};
+
+/*
+ * FCP request structure, one for each scsi cmd request
+ */
+struct fc_fcp_pkt {
+ /*
+ * housekeeping stuff
+ */
+ struct fc_lport *lp; /* handle to hba struct */
+ u16 state; /* scsi_pkt state state */
+ u16 tgt_flags; /* target flags */
+ atomic_t ref_cnt; /* fcp pkt ref count */
+ spinlock_t scsi_pkt_lock; /* Must be taken before the host lock
+ * if both are held at the same time */
+ /*
+ * SCSI I/O related stuff
+ */
+ struct scsi_cmnd *cmd; /* scsi command pointer. set/clear
+ * under host lock */
+ struct list_head list; /* tracks queued commands. access under
+ * host lock */
+ /*
+ * timeout related stuff
+ */
+ struct timer_list timer; /* command timer */
+ struct completion tm_done;
+ int wait_for_comp;
+ unsigned long start_time; /* start jiffie */
+ unsigned long end_time; /* end jiffie */
+ unsigned long last_pkt_time; /* jiffies of last frame received */
+
+ /*
+ * scsi cmd and data transfer information
+ */
+ u32 data_len;
+ /*
+ * transport related veriables
+ */
+ struct fcp_cmnd cdb_cmd;
+ size_t xfer_len;
+ u32 xfer_contig_end; /* offset of end of contiguous xfer */
+ u16 max_payload; /* max payload size in bytes */
+
+ /*
+ * scsi/fcp return status
+ */
+ u32 io_status; /* SCSI result upper 24 bits */
+ u8 cdb_status;
+ u8 status_code; /* FCP I/O status */
+ /* bit 3 Underrun bit 2: overrun */
+ u8 scsi_comp_flags;
+ u32 req_flags; /* bit 0: read bit:1 write */
+ u32 scsi_resid; /* residule length */
+
+ struct fc_rport *rport; /* remote port pointer */
+ struct fc_seq *seq_ptr; /* current sequence pointer */
+ /*
+ * Error Processing
+ */
+ u8 recov_retry; /* count of recovery retries */
+ struct fc_seq *recov_seq; /* sequence for REC or SRR */
+};
+
+/*
+ * Structure and function definitions for managing Fibre Channel Exchanges
+ * and Sequences
+ *
+ * fc_exch holds state for one exchange and links to its active sequence.
+ *
+ * fc_seq holds the state for an individual sequence.
+ */
+
+struct fc_exch_mgr;
+
+/*
+ * Sequence.
+ */
+struct fc_seq {
+ u8 id; /* seq ID */
+ u16 ssb_stat; /* status flags for sequence status block */
+ u16 cnt; /* frames sent so far on sequence */
+ u32 rec_data; /* FC-4 value for REC */
+};
+
+#define FC_EX_DONE (1 << 0) /* ep is completed */
+#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
+
+/*
+ * Exchange.
+ *
+ * Locking notes: The ex_lock protects following items:
+ * state, esb_stat, f_ctl, seq.ssb_stat
+ * seq_id
+ * sequence allocation
+ */
+struct fc_exch {
+ struct fc_exch_mgr *em; /* exchange manager */
+ u32 state; /* internal driver state */
+ u16 xid; /* our exchange ID */
+ struct list_head ex_list; /* free or busy list linkage */
+ spinlock_t ex_lock; /* lock covering exchange state */
+ atomic_t ex_refcnt; /* reference counter */
+ struct delayed_work timeout_work; /* timer for upper level protocols */
+ struct fc_lport *lp; /* fc device instance */
+ u16 oxid; /* originator's exchange ID */
+ u16 rxid; /* responder's exchange ID */
+ u32 oid; /* originator's FCID */
+ u32 sid; /* source FCID */
+ u32 did; /* destination FCID */
+ u32 esb_stat; /* exchange status for ESB */
+ u32 r_a_tov; /* r_a_tov from rport (msec) */
+ u8 seq_id; /* next sequence ID to use */
+ u32 f_ctl; /* F_CTL flags for sequences */
+ u8 fh_type; /* frame type */
+ enum fc_class class; /* class of service */
+ struct fc_seq seq; /* single sequence */
+ /*
+ * Handler for responses to this current exchange.
+ */
+ void (*resp)(struct fc_seq *, struct fc_frame *, void *);
+ void (*destructor)(struct fc_seq *, void *);
+ /*
+ * arg is passed as void pointer to exchange
+ * resp and destructor handlers
+ */
+ void *arg;
+};
+#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
+
+struct libfc_function_template {
+
+ /**
+ * Mandatory Fields
+ *
+ * These handlers must be implemented by the LLD.
+ */
+
+ /*
+ * Interface to send a FC frame
+ */
+ int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
+
+ /**
+ * Optional Fields
+ *
+ * The LLD may choose to implement any of the following handlers.
+ * If LLD doesn't specify hander and leaves its pointer NULL then
+ * the default libfc function will be used for that handler.
+ */
+
+ /**
+ * ELS/CT interfaces
+ */
+
+ /*
+ * elsct_send - sends ELS/CT frame
+ */
+ struct fc_seq *(*elsct_send)(struct fc_lport *lport,
+ struct fc_rport *rport,
+ struct fc_frame *fp,
+ unsigned int op,
+ void (*resp)(struct fc_seq *,
+ struct fc_frame *fp,
+ void *arg),
+ void *arg, u32 timer_msec);
+ /**
+ * Exhance Manager interfaces
+ */
+
+ /*
+ * Send the FC frame payload using a new exchange and sequence.
+ *
+ * The frame pointer with some of the header's fields must be
+ * filled before calling exch_seq_send(), those fields are,
+ *
+ * - routing control
+ * - FC port did
+ * - FC port sid
+ * - FC header type
+ * - frame control
+ * - parameter or relative offset
+ *
+ * The exchange response handler is set in this routine to resp()
+ * function pointer. It can be called in two scenarios: if a timeout
+ * occurs or if a response frame is received for the exchange. The
+ * fc_frame pointer in response handler will also indicate timeout
+ * as error using IS_ERR related macros.
+ *
+ * The exchange destructor handler is also set in this routine.
+ * The destructor handler is invoked by EM layer when exchange
+ * is about to free, this can be used by caller to free its
+ * resources along with exchange free.
+ *
+ * The arg is passed back to resp and destructor handler.
+ *
+ * The timeout value (in msec) for an exchange is set if non zero
+ * timer_msec argument is specified. The timer is canceled when
+ * it fires or when the exchange is done. The exchange timeout handler
+ * is registered by EM layer.
+ */
+ struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
+ struct fc_frame *fp,
+ void (*resp)(struct fc_seq *sp,
+ struct fc_frame *fp,
+ void *arg),
+ void (*destructor)(struct fc_seq *sp,
+ void *arg),
+ void *arg, unsigned int timer_msec);
+
+ /*
+ * send a frame using existing sequence and exchange.
+ */
+ int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
+ struct fc_frame *fp);
+
+ /*
+ * Send ELS response using mainly infomation
+ * in exchange and sequence in EM layer.
+ */
+ void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
+ struct fc_seq_els_data *els_data);
+
+ /*
+ * Abort an exchange and sequence. Generally called because of a
+ * exchange timeout or an abort from the upper layer.
+ *
+ * A timer_msec can be specified for abort timeout, if non-zero
+ * timer_msec value is specified then exchange resp handler
+ * will be called with timeout error if no response to abort.
+ */
+ int (*seq_exch_abort)(const struct fc_seq *req_sp,
+ unsigned int timer_msec);
+
+ /*
+ * Indicate that an exchange/sequence tuple is complete and the memory
+ * allocated for the related objects may be freed.
+ */
+ void (*exch_done)(struct fc_seq *sp);
+
+ /*
+ * Assigns a EM and a free XID for an new exchange and then
+ * allocates a new exchange and sequence pair.
+ * The fp can be used to determine free XID.
+ */
+ struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);
+
+ /*
+ * Release previously assigned XID by exch_get API.
+ * The LLD may implement this if XID is assigned by LLD
+ * in exch_get().
+ */
+ void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ u16 ex_id);
+
+ /*
+ * Start a new sequence on the same exchange/sequence tuple.
+ */
+ struct fc_seq *(*seq_start_next)(struct fc_seq *sp);
+
+ /*
+ * Reset an exchange manager, completing all sequences and exchanges.
+ * If s_id is non-zero, reset only exchanges originating from that FID.
+ * If d_id is non-zero, reset only exchanges sending to that FID.
+ */
+ void (*exch_mgr_reset)(struct fc_exch_mgr *,
+ u32 s_id, u32 d_id);
+
+ void (*rport_flush_queue)(void);
+ /**
+ * Local Port interfaces
+ */
+
+ /*
+ * Receive a frame to a local port.
+ */
+ void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
+ struct fc_frame *fp);
+
+ int (*lport_reset)(struct fc_lport *);
+
+ /**
+ * Remote Port interfaces
+ */
+
+ /*
+ * Initiates the RP state machine. It is called from the LP module.
+ * This function will issue the following commands to the N_Port
+ * identified by the FC ID provided.
+ *
+ * - PLOGI
+ * - PRLI
+ * - RTV
+ */
+ int (*rport_login)(struct fc_rport *rport);
+
+ /*
+ * Logoff, and remove the rport from the transport if
+ * it had been added. This will send a LOGO to the target.
+ */
+ int (*rport_logoff)(struct fc_rport *rport);
+
+ /*
+ * Recieve a request from a remote port.
+ */
+ void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
+ struct fc_rport *);
+
+ struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
+
+ /**
+ * FCP interfaces
+ */
+
+ /*
+ * Send a fcp cmd from fsp pkt.
+ * Called with the SCSI host lock unlocked and irqs disabled.
+ *
+ * The resp handler is called when FCP_RSP received.
+ *
+ */
+ int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
+ void (*resp)(struct fc_seq *, struct fc_frame *fp,
+ void *arg));
+
+ /*
+ * Used at least durring linkdown and reset
+ */
+ void (*fcp_cleanup)(struct fc_lport *lp);
+
+ /*
+ * Abort all I/O on a local port
+ */
+ void (*fcp_abort_io)(struct fc_lport *lp);
+
+ /**
+ * Discovery interfaces
+ */
+
+ void (*disc_recv_req)(struct fc_seq *,
+ struct fc_frame *, struct fc_lport *);
+
+ /*
+ * Start discovery for a local port.
+ */
+ void (*disc_start)(void (*disc_callback)(struct fc_lport *,
+ enum fc_disc_event),
+ struct fc_lport *);
+
+ /*
+ * Stop discovery for a given lport. This will remove
+ * all discovered rports
+ */
+ void (*disc_stop) (struct fc_lport *);
+
+ /*
+ * Stop discovery for a given lport. This will block
+ * until all discovered rports are deleted from the
+ * FC transport class
+ */
+ void (*disc_stop_final) (struct fc_lport *);
+};
+
+/* information used by the discovery layer */
+struct fc_disc {
+ unsigned char retry_count;
+ unsigned char delay;
+ unsigned char pending;
+ unsigned char requested;
+ unsigned short seq_count;
+ unsigned char buf_len;
+ enum fc_disc_event event;
+
+ void (*disc_callback)(struct fc_lport *,
+ enum fc_disc_event);
+
+ struct list_head rports;
+ struct fc_lport *lport;
+ struct mutex disc_mutex;
+ struct fc_gpn_ft_resp partial_buf; /* partial name buffer */
+ struct delayed_work disc_work;
+};
+
+struct fc_lport {
+ struct list_head list;
+
+ /* Associations */
+ struct Scsi_Host *host;
+ struct fc_exch_mgr *emp;
+ struct fc_rport *dns_rp;
+ struct fc_rport *ptp_rp;
+ void *scsi_priv;
+ struct fc_disc disc;
+
+ /* Operational Information */
+ struct libfc_function_template tt;
+ u16 link_status;
+ enum fc_lport_state state;
+ unsigned long boot_time;
+
+ struct fc_host_statistics host_stats;
+ struct fcoe_dev_stats *dev_stats[NR_CPUS];
+ u64 wwpn;
+ u64 wwnn;
+ u8 retry_count;
+
+ /* Capabilities */
+ u32 sg_supp:1; /* scatter gather supported */
+ u32 seq_offload:1; /* seq offload supported */
+ u32 crc_offload:1; /* crc offload supported */
+ u32 lro_enabled:1; /* large receive offload */
+ u32 mfs; /* max FC payload size */
+ unsigned int service_params;
+ unsigned int e_d_tov;
+ unsigned int r_a_tov;
+ u8 max_retry_count;
+ u16 link_speed;
+ u16 link_supported_speeds;
+ u16 lro_xid; /* max xid for fcoe lro */
+ struct fc_ns_fts fcts; /* FC-4 type masks */
+ struct fc_els_rnid_gen rnid_gen; /* RNID information */
+
+ /* Semaphores */
+ struct mutex lp_mutex;
+
+ /* Miscellaneous */
+ struct delayed_work retry_work;
+ struct delayed_work disc_work;
+};
+
+/**
+ * FC_LPORT HELPER FUNCTIONS
+ *****************************/
+static inline void *lport_priv(const struct fc_lport *lp)
+{
+ return (void *)(lp + 1);
+}
+
+static inline int fc_lport_test_ready(struct fc_lport *lp)
+{
+ return lp->state == LPORT_ST_READY;
+}
+
+static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
+{
+ lp->wwnn = wwnn;
+}
+
+static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn)
+{
+ lp->wwpn = wwnn;
+}
+
+static inline void fc_lport_state_enter(struct fc_lport *lp,
+ enum fc_lport_state state)
+{
+ if (state != lp->state)
+ lp->retry_count = 0;
+ lp->state = state;
+}
+
+
+/**
+ * LOCAL PORT LAYER
+ *****************************/
+int fc_lport_init(struct fc_lport *lp);
+
+/*
+ * Destroy the specified local port by finding and freeing all
+ * fc_rports associated with it and then by freeing the fc_lport
+ * itself.
+ */
+int fc_lport_destroy(struct fc_lport *lp);
+
+/*
+ * Logout the specified local port from the fabric
+ */
+int fc_fabric_logoff(struct fc_lport *lp);
+
+/*
+ * Initiate the LP state machine. This handler will use fc_host_attr
+ * to store the FLOGI service parameters, so fc_host_attr must be
+ * initialized before calling this handler.
+ */
+int fc_fabric_login(struct fc_lport *lp);
+
+/*
+ * The link is up for the given local port.
+ */
+void fc_linkup(struct fc_lport *);
+
+/*
+ * Link is down for the given local port.
+ */
+void fc_linkdown(struct fc_lport *);
+
+/*
+ * Pause and unpause traffic.
+ */
+void fc_pause(struct fc_lport *);
+void fc_unpause(struct fc_lport *);
+
+/*
+ * Configure the local port.
+ */
+int fc_lport_config(struct fc_lport *);
+
+/*
+ * Reset the local port.
+ */
+int fc_lport_reset(struct fc_lport *);
+
+/*
+ * Set the mfs or reset
+ */
+int fc_set_mfs(struct fc_lport *lp, u32 mfs);
+
+
+/**
+ * REMOTE PORT LAYER
+ *****************************/
+int fc_rport_init(struct fc_lport *lp);
+void fc_rport_terminate_io(struct fc_rport *rp);
+
+/**
+ * DISCOVERY LAYER
+ *****************************/
+int fc_disc_init(struct fc_lport *lp);
+
+
+/**
+ * SCSI LAYER
+ *****************************/
+/*
+ * Initialize the SCSI block of libfc
+ */
+int fc_fcp_init(struct fc_lport *);
+
+/*
+ * This section provides an API which allows direct interaction
+ * with the SCSI-ml. Each of these functions satisfies a function
+ * pointer defined in Scsi_Host and therefore is always called
+ * directly from the SCSI-ml.
+ */
+int fc_queuecommand(struct scsi_cmnd *sc_cmd,
+ void (*done)(struct scsi_cmnd *));
+
+/*
+ * complete processing of a fcp packet
+ *
+ * This function may sleep if a fsp timer is pending.
+ * The host lock must not be held by caller.
+ */
+void fc_fcp_complete(struct fc_fcp_pkt *fsp);
+
+/*
+ * Send an ABTS frame to the target device. The sc_cmd argument
+ * is a pointer to the SCSI command to be aborted.
+ */
+int fc_eh_abort(struct scsi_cmnd *sc_cmd);
+
+/*
+ * Reset a LUN by sending send the tm cmd to the target.
+ */
+int fc_eh_device_reset(struct scsi_cmnd *sc_cmd);
+
+/*
+ * Reset the host adapter.
+ */
+int fc_eh_host_reset(struct scsi_cmnd *sc_cmd);
+
+/*
+ * Check rport status.
+ */
+int fc_slave_alloc(struct scsi_device *sdev);
+
+/*
+ * Adjust the queue depth.
+ */
+int fc_change_queue_depth(struct scsi_device *sdev, int qdepth);
+
+/*
+ * Change the tag type.
+ */
+int fc_change_queue_type(struct scsi_device *sdev, int tag_type);
+
+/*
+ * Free memory pools used by the FCP layer.
+ */
+void fc_fcp_destroy(struct fc_lport *);
+
+/**
+ * ELS/CT interface
+ *****************************/
+/*
+ * Initializes ELS/CT interface
+ */
+int fc_elsct_init(struct fc_lport *lp);
+
+
+/**
+ * EXCHANGE MANAGER LAYER
+ *****************************/
+/*
+ * Initializes Exchange Manager related
+ * function pointers in struct libfc_function_template.
+ */
+int fc_exch_init(struct fc_lport *lp);
+
+/*
+ * Allocates an Exchange Manager (EM).
+ *
+ * The EM manages exchanges for their allocation and
+ * free, also allows exchange lookup for received
+ * frame.
+ *
+ * The class is used for initializing FC class of
+ * allocated exchange from EM.
+ *
+ * The min_xid and max_xid will limit new
+ * exchange ID (XID) within this range for
+ * a new exchange.
+ * The LLD may choose to have multiple EMs,
+ * e.g. one EM instance per CPU receive thread in LLD.
+ * The LLD can use exch_get() of struct libfc_function_template
+ * to specify XID for a new exchange within
+ * a specified EM instance.
+ *
+ * The em_idx to uniquely identify an EM instance.
+ */
+struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
+ enum fc_class class,
+ u16 min_xid,
+ u16 max_xid);
+
+/*
+ * Free an exchange manager.
+ */
+void fc_exch_mgr_free(struct fc_exch_mgr *mp);
+
+/*
+ * Receive a frame on specified local port and exchange manager.
+ */
+void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ struct fc_frame *fp);
+
+/*
+ * This function is for exch_seq_send function pointer in
+ * struct libfc_function_template, see comment block on
+ * exch_seq_send for description of this function.
+ */
+struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
+ struct fc_frame *fp,
+ void (*resp)(struct fc_seq *sp,
+ struct fc_frame *fp,
+ void *arg),
+ void (*destructor)(struct fc_seq *sp,
+ void *arg),
+ void *arg, u32 timer_msec);
+
+/*
+ * send a frame using existing sequence and exchange.
+ */
+int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp);
+
+/*
+ * Send ELS response using mainly infomation
+ * in exchange and sequence in EM layer.
+ */
+void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
+ struct fc_seq_els_data *els_data);
+
+/*
+ * This function is for seq_exch_abort function pointer in
+ * struct libfc_function_template, see comment block on
+ * seq_exch_abort for description of this function.
+ */
+int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec);
+
+/*
+ * Indicate that an exchange/sequence tuple is complete and the memory
+ * allocated for the related objects may be freed.
+ */
+void fc_exch_done(struct fc_seq *sp);
+
+/*
+ * Assigns a EM and XID for a frame and then allocates
+ * a new exchange and sequence pair.
+ * The fp can be used to determine free XID.
+ */
+struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp);
+
+/*
+ * Allocate a new exchange and sequence pair.
+ * if ex_id is zero then next free exchange id
+ * from specified exchange manger mp will be assigned.
+ */
+struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
+ struct fc_frame *fp, u16 ex_id);
+/*
+ * Start a new sequence on the same exchange as the supplied sequence.
+ */
+struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
+
+/*
+ * Reset an exchange manager, completing all sequences and exchanges.
+ * If s_id is non-zero, reset only exchanges originating from that FID.
+ * If d_id is non-zero, reset only exchanges sending to that FID.
+ */
+void fc_exch_mgr_reset(struct fc_exch_mgr *, u32 s_id, u32 d_id);
+
+/*
+ * Functions for fc_functions_template
+ */
+void fc_get_host_speed(struct Scsi_Host *shost);
+void fc_get_host_port_type(struct Scsi_Host *shost);
+void fc_get_host_port_state(struct Scsi_Host *shost);
+void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout);
+struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
+
+/*
+ * module setup functions.
+ */
+int fc_setup_exch_mgr(void);
+void fc_destroy_exch_mgr(void);
+int fc_setup_rport(void);
+void fc_destroy_rport(void);
+
+#endif /* _LIBFC_H_ */
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff