#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
-MODULE_AUTHOR("Open-FCoE.org");
-MODULE_DESCRIPTION("libfc");
-MODULE_LICENSE("GPL");
+#include "fc_libfc.h"
-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;
+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_ABORTED (1 << 3) /* abort acknowledged */
#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)
#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
+/**
+ * struct fc_fcp_internal - FCP layer internal data
+ * @scsi_pkt_pool: Memory pool to draw FCP packets from
+ * @scsi_queue_lock: Protects the scsi_pkt_queue
+ * @scsi_pkt_queue: Current FCP packets
+ * @last_can_queue_ramp_down_time: ramp down time
+ * @last_can_queue_ramp_up_time: ramp up time
+ * @max_can_queue: max can_queue size
+ */
struct fc_fcp_internal {
- mempool_t *scsi_pkt_pool;
- struct list_head scsi_pkt_queue;
- u8 throttled;
+ mempool_t *scsi_pkt_pool;
+ spinlock_t scsi_queue_lock;
+ struct list_head scsi_pkt_queue;
+ unsigned long last_can_queue_ramp_down_time;
+ unsigned long last_can_queue_ramp_up_time;
+ int max_can_queue;
};
#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
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_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
static void fc_timeout_error(struct fc_fcp_pkt *);
-static void fc_fcp_timeout(unsigned long data);
+static void fc_fcp_timeout(unsigned long);
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 *);
#define FC_SCSI_TM_TOV (10 * HZ)
#define FC_SCSI_REC_TOV (2 * HZ)
#define FC_HOST_RESET_TIMEOUT (30 * HZ)
+#define FC_CAN_QUEUE_PERIOD (60 * 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
+ * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
+ * @lport: The local port that the FCP packet is for
+ * @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.
+ * Return value: fcp_pkt structure or null on allocation failure.
+ * Context: Can be called from process context, no lock is required.
*/
-static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
+static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
{
- struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
struct fc_fcp_pkt *fsp;
fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
if (fsp) {
memset(fsp, 0, sizeof(*fsp));
- fsp->lp = lp;
+ fsp->lp = lport;
atomic_set(&fsp->ref_cnt, 1);
init_timer(&fsp->timer);
INIT_LIST_HEAD(&fsp->list);
}
/**
- * fc_fcp_pkt_release() - release hold on scsi_pkt packet
- * @fsp: fcp packet struct
+ * fc_fcp_pkt_release() - Release hold on a fcp_pkt
+ * @fsp: The FCP packet to be released
*
- * This is used by upper layer scsi driver.
- * Context : call from process and interrupt context.
- * no locking required
+ * Context: Can be called from process or interrupt context,
+ * no lock is required.
*/
static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
{
}
}
+/**
+ * fc_fcp_pkt_hold() - Hold a fcp_pkt
+ * @fsp: The FCP packet to be held
+ */
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
+ * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
+ * @seq: The sequence that the FCP packet is on (required by destructor API)
+ * @fsp: The FCP packet to be released
+ *
+ * This routine is called by a destructor callback in the exch_seq_send()
+ * routine of the libfc Transport Template. The 'struct fc_seq' is a required
+ * argument even though it is not used by this routine.
*
- * 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
+ * Context: No locking required.
*/
static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
{
}
/**
- * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
- * @fsp: fcp packet
+ * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
+ * @fsp: The FCP packet to be locked and incremented
*
- * We should only return error if we return a command to scsi-ml before
+ * 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.
return 0;
}
+/**
+ * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
+ * reference count
+ * @fsp: The FCP packet to be unlocked and decremented
+ */
static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
{
spin_unlock_bh(&fsp->scsi_pkt_lock);
fc_fcp_pkt_release(fsp);
}
+/**
+ * fc_fcp_timer_set() - Start a timer for a fcp_pkt
+ * @fsp: The FCP packet to start a timer for
+ * @delay: The timeout period for the timer
+ */
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);
}
+/**
+ * fc_fcp_send_abort() - Send an abort for exchanges associated with a
+ * fcp_pkt
+ * @fsp: The FCP packet to abort exchanges on
+ */
static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
{
if (!fsp->seq_ptr)
return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
}
-/*
- * Retry command.
- * An abort isn't needed.
+/**
+ * fc_fcp_retry_cmd() - Retry a fcp_pkt
+ * @fsp: The FCP packet to be retried
+ *
+ * Sets the status code to be FC_ERROR and then calls
+ * fc_fcp_complete_locked() which in turn calls fc_io_compl().
+ * fc_io_compl() will notify the SCSI-ml that the I/O is done.
+ * The SCSI-ml will retry the command.
*/
static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
{
fc_fcp_complete_locked(fsp);
}
+/**
+ * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
+ * @fsp: The FCP packet that will manage the DDP frames
+ * @xid: The XID that will be used for the DDP exchange
+ */
+void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
+{
+ struct fc_lport *lport;
+
+ lport = fsp->lp;
+ if ((fsp->req_flags & FC_SRB_READ) &&
+ (lport->lro_enabled) && (lport->tt.ddp_setup)) {
+ if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
+ scsi_sg_count(fsp->cmd)))
+ fsp->xfer_ddp = xid;
+ }
+}
+
+/**
+ * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
+ * DDP related resources for a fcp_pkt
+ * @fsp: The FCP packet that DDP had been used on
+ */
+static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lport;
+
+ if (!fsp)
+ return;
+
+ if (fsp->xfer_ddp == FC_XID_UNKNOWN)
+ return;
+
+ lport = fsp->lp;
+ if (lport->tt.ddp_done) {
+ fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
+ fsp->xfer_ddp = FC_XID_UNKNOWN;
+ }
+}
+
+/**
+ * fc_fcp_can_queue_ramp_up() - increases can_queue
+ * @lport: lport to ramp up can_queue
+ *
+ * Locking notes: Called with Scsi_Host lock held
+ */
+static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
+ int can_queue;
+
+ if (si->last_can_queue_ramp_up_time &&
+ (time_before(jiffies, si->last_can_queue_ramp_up_time +
+ FC_CAN_QUEUE_PERIOD)))
+ return;
+
+ if (time_before(jiffies, si->last_can_queue_ramp_down_time +
+ FC_CAN_QUEUE_PERIOD))
+ return;
+
+ si->last_can_queue_ramp_up_time = jiffies;
+
+ can_queue = lport->host->can_queue << 1;
+ if (can_queue >= si->max_can_queue) {
+ can_queue = si->max_can_queue;
+ si->last_can_queue_ramp_down_time = 0;
+ }
+ lport->host->can_queue = can_queue;
+ shost_printk(KERN_ERR, lport->host, "libfc: increased "
+ "can_queue to %d.\n", can_queue);
+}
+
+/**
+ * fc_fcp_can_queue_ramp_down() - reduces can_queue
+ * @lport: lport to reduce can_queue
+ *
+ * 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.
+ *
+ * Locking notes: Called with Scsi_Host lock held
+ */
+static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
+ int can_queue;
+
+ if (si->last_can_queue_ramp_down_time &&
+ (time_before(jiffies, si->last_can_queue_ramp_down_time +
+ FC_CAN_QUEUE_PERIOD)))
+ return;
+
+ si->last_can_queue_ramp_down_time = jiffies;
+
+ can_queue = lport->host->can_queue;
+ can_queue >>= 1;
+ if (!can_queue)
+ can_queue = 1;
+ lport->host->can_queue = can_queue;
+ shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
+ "Reducing can_queue to %d.\n", can_queue);
+}
+
/*
- * Receive SCSI data from target.
- * Called after receiving solicited data.
+ * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
+ * @lport: fc lport struct
+ * @len: payload length
+ *
+ * Allocates fc_frame structure and buffer but if fails to allocate
+ * then reduce can_queue.
+ */
+static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
+ size_t len)
+{
+ struct fc_frame *fp;
+ unsigned long flags;
+
+ fp = fc_frame_alloc(lport, len);
+ if (likely(fp))
+ return fp;
+
+ /* error case */
+ spin_lock_irqsave(lport->host->host_lock, flags);
+ fc_fcp_can_queue_ramp_down(lport);
+ spin_unlock_irqrestore(lport->host->host_lock, flags);
+ return NULL;
+}
+
+/**
+ * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
+ * @fsp: The FCP packet the data is on
+ * @fp: The data frame
*/
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 fc_lport *lport = fsp->lp;
struct fcoe_dev_stats *stats;
struct fc_frame_header *fh;
size_t start_offset;
size_t len;
void *buf;
struct scatterlist *sg;
- size_t remaining;
+ u32 nents;
fh = fc_frame_header_get(fp);
offset = ntohl(fh->fh_parm_offset);
len = fr_len(fp) - sizeof(*fh);
buf = fc_frame_payload_get(fp, 0);
+ /* if this I/O is ddped, update xfer len */
+ fc_fcp_ddp_done(fsp);
+
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_DBG(fsp, "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;
+ nents = scsi_sg_count(sc);
- 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) {
+ if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
+ copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
+ &offset, KM_SOFTIRQ0, NULL);
+ } else {
+ crc = crc32(~0, (u8 *) fh, sizeof(*fh));
+ copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
+ &offset, KM_SOFTIRQ0, &crc);
buf = fc_frame_payload_get(fp, 0);
- if (len % 4) {
+ 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 = fc_lport_get_stats(lport);
stats->ErrorFrames++;
+ /* FIXME - per cpu count, not total count! */
if (stats->InvalidCRCCount++ < 5)
- FC_DBG("CRC error on data frame\n");
+ printk(KERN_WARNING "libfc: CRC error on data "
+ "frame for port (%6x)\n",
+ fc_host_port_id(lport->host));
/*
* Assume the frame is total garbage.
* We may have copied it over the good part
}
/**
- * 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
+ * fc_fcp_send_data() - Send SCSI data to a target
+ * @fsp: The FCP packet the data is on
+ * @sp: The sequence the data is to be sent on
+ * @offset: The 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.
+ * If the LLD is capable of sequence offload then send down the
+ * seq_blen amount of data in single frame, otherwise send
+ * multiple frames of the maximum frame payload supported by
+ * the target port.
*/
static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
size_t offset, size_t seq_blen)
struct scsi_cmnd *sc;
struct scatterlist *sg;
struct fc_frame *fp = NULL;
- struct fc_lport *lp = fsp->lp;
+ struct fc_lport *lport = fsp->lp;
+ struct page *page;
size_t remaining;
size_t t_blen;
size_t tlen;
size_t sg_bytes;
size_t frame_offset, fh_parm_offset;
+ size_t off;
int error;
void *data = NULL;
void *page_addr;
- int using_sg = lp->sg_supp;
+ int using_sg = lport->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_DBG(fsp, "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);
+ FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
+ "seq_blen %zx offset %zx\n", seq_blen, offset);
}
/*
* to max FC frame payload previously set in fsp->max_payload.
*/
t_blen = fsp->max_payload;
- if (lp->seq_offload) {
- t_blen = min(seq_blen, (size_t)lp->lso_max);
- FC_DEBUG_FCP("fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
- fsp, seq_blen, lp->lso_max, t_blen);
+ if (lport->seq_offload) {
+ t_blen = min(seq_blen, (size_t)lport->lso_max);
+ FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
+ fsp, seq_blen, lport->lso_max, t_blen);
}
WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
remaining = seq_blen;
fh_parm_offset = frame_offset = offset;
tlen = 0;
- seq = lp->tt.seq_start_next(seq);
+ seq = lport->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 (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;
+ fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
+ if (!fp)
+ return -ENOMEM;
- data = (void *)(fr_hdr(fp)) +
- sizeof(struct fc_frame_header);
- }
+ data = fc_frame_header_get(fp) + 1;
fh_parm_offset = frame_offset;
fr_max_payload(fp) = fsp->max_payload;
}
+
+ off = offset + sg->offset;
sg_bytes = min(tlen, sg->length - offset);
+ sg_bytes = min(sg_bytes,
+ (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
+ page = sg_page(sg) + (off >> PAGE_SHIFT);
if (using_sg) {
- WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags >
- FC_FRAME_SG_LEN);
- get_page(sg_page(sg));
+ get_page(page);
skb_fill_page_desc(fp_skb(fp),
skb_shinfo(fp_skb(fp))->nr_frags,
- sg_page(sg), sg->offset + offset,
- sg_bytes);
+ page, off & ~PAGE_MASK, 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);
+ page_addr = kmap_atomic(page, KM_SOFTIRQ0);
memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
sg_bytes);
kunmap_atomic(page_addr, KM_SOFTIRQ0);
tlen -= sg_bytes;
remaining -= sg_bytes;
- if (tlen)
+ if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
+ (tlen))
continue;
/*
/*
* send fragment using for a sequence.
*/
- error = lp->tt.seq_send(lp, seq, fp);
+ error = lport->tt.seq_send(lport, seq, fp);
if (error) {
WARN_ON(1); /* send error should be rare */
fc_fcp_retry_cmd(fsp);
return 0;
}
+/**
+ * fc_fcp_abts_resp() - Send an ABTS response
+ * @fsp: The FCP packet that is being aborted
+ * @fp: The response frame
+ */
static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
{
int ba_done = 1;
}
/**
- * 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);
-}
-
-/**
- * fc_fcp_recv() - Reveive FCP frames
+ * fc_fcp_recv() - Reveive an FCP frame
* @seq: The sequence the frame is on
- * @fp: The FC frame
+ * @fp: The received frame
* @arg: The related FCP packet
*
- * Return : None
- * Context : called from Soft IRQ context
- * can not called holding list lock
+ * Context: Called from Soft IRQ context. Can not be called
+ * holding the FCP packet 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_lport *lport = fsp->lp;
struct fc_frame_header *fh;
struct fcp_txrdy *dd;
u8 r_ctl;
int rc = 0;
- if (IS_ERR(fp))
- goto errout;
+ if (IS_ERR(fp)) {
+ fc_fcp_error(fsp, fp);
+ return;
+ }
fh = fc_frame_header_get(fp);
r_ctl = fh->fh_r_ctl;
- lp = fsp->lp;
- if (!(lp->state & LPORT_ST_READY))
+ if (!(lport->state & LPORT_ST_READY))
goto out;
if (fc_fcp_lock_pkt(fsp))
goto out;
(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
fc_fcp_resp(fsp, fp);
} else {
- FC_DBG("unexpected frame. r_ctl %x\n", r_ctl);
+ FC_FCP_DBG(fsp, "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);
}
+/**
+ * fc_fcp_resp() - Handler for FCP responses
+ * @fsp: The FCP packet the response is for
+ * @fp: The response frame
+ */
static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
{
struct fc_frame_header *fh;
fsp->scsi_comp_flags = flags;
expected_len = fsp->data_len;
+ /* if ddp, update xfer len */
+ fc_fcp_ddp_done(fsp);
+
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)) {
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_DBG(fsp, "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);
+ FC_FCP_DBG(fsp, "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
+ * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
+ * fcp_pkt lock held
+ * @fsp: The FCP packet to be completed
*
* 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_lport *lport = fsp->lp;
struct fc_seq *seq;
struct fc_exch *ep;
u32 f_ctl;
struct fc_frame *conf_frame;
struct fc_seq *csp;
- csp = lp->tt.seq_start_next(seq);
- conf_frame = fc_frame_alloc(fsp->lp, 0);
+ csp = lport->tt.seq_start_next(seq);
+ conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
if (conf_frame) {
f_ctl = FC_FC_SEQ_INIT;
f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_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);
+ lport->tt.seq_send(lport, csp, conf_frame);
}
}
- lp->tt.exch_done(seq);
+ lport->tt.exch_done(seq);
}
fc_io_compl(fsp);
}
+/**
+ * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
+ * @fsp: The FCP packet whose exchanges should be canceled
+ * @error: The reason for the cancellation
+ */
static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
{
- struct fc_lport *lp = fsp->lp;
+ struct fc_lport *lport = fsp->lp;
if (fsp->seq_ptr) {
- lp->tt.exch_done(fsp->seq_ptr);
+ lport->tt.exch_done(fsp->seq_ptr);
fsp->seq_ptr = NULL;
}
fsp->status_code = error;
}
/**
- * fc_fcp_cleanup_each_cmd() - Cleanup active commads
- * @lp: logical port
- * @id: target id
- * @lun: lun
- * @error: fsp status code
+ * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
+ * @lport: The local port whose exchanges should be canceled
+ * @id: The target's ID
+ * @lun: The LUN
+ * @error: The reason for cancellation
*
* If lun or id is -1, they are ignored.
*/
-static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
+static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
unsigned int lun, int error)
{
- struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
struct fc_fcp_pkt *fsp;
struct scsi_cmnd *sc_cmd;
unsigned long flags;
- spin_lock_irqsave(lp->host->host_lock, flags);
+ spin_lock_irqsave(&si->scsi_queue_lock, flags);
restart:
list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
sc_cmd = fsp->cmd;
continue;
fc_fcp_pkt_hold(fsp);
- spin_unlock_irqrestore(lp->host->host_lock, flags);
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
if (!fc_fcp_lock_pkt(fsp)) {
fc_fcp_cleanup_cmd(fsp, error);
}
fc_fcp_pkt_release(fsp);
- spin_lock_irqsave(lp->host->host_lock, flags);
+ spin_lock_irqsave(&si->scsi_queue_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);
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
}
-static void fc_fcp_abort_io(struct fc_lport *lp)
+/**
+ * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
+ * @lport: The local port whose exchanges are to be aborted
+ */
+static void fc_fcp_abort_io(struct fc_lport *lport)
{
- fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
+ fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
}
/**
- * fc_fcp_pkt_send() - send a fcp packet to the lower level.
- * @lp: fc lport
- * @fsp: fc packet.
+ * fc_fcp_pkt_send() - Send a fcp_pkt
+ * @lport: The local port to send the FCP packet on
+ * @fsp: The FCP packet to send
*
- * 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.
+ * Return: Zero for success and -1 for failure
+ * Locks: Called without locks held
*/
-static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
+static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
{
- struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
+ unsigned long flags;
int rc;
fsp->cmd->SCp.ptr = (char *)fsp;
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)
+ spin_lock_irqsave(&si->scsi_queue_lock, flags);
+ list_add_tail(&fsp->list, &si->scsi_pkt_queue);
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
+ rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
+ if (unlikely(rc)) {
+ spin_lock_irqsave(&si->scsi_queue_lock, flags);
list_del(&fsp->list);
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
+ }
return rc;
}
-static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
+/**
+ * fc_fcp_cmd_send() - Send a FCP command
+ * @lport: The local port to send the command on
+ * @fsp: The FCP packet the command is on
+ * @resp: The handler for the response
+ */
+static int fc_fcp_cmd_send(struct fc_lport *lport, 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;
+ struct fc_rport_libfc_priv *rpriv;
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));
+ fp = fc_fcp_frame_alloc(lport, 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;
+ fr_fsp(fp) = fsp;
rport = fsp->rport;
fsp->max_payload = rport->maxframe_size;
- rp = rport->dd_data;
+ rpriv = 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_host_port_id(rpriv->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);
+ seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
+ fsp, 0);
if (!seq) {
- fc_frame_free(fp);
rc = -1;
goto unlock;
}
return rc;
}
-/*
- * transport error handler
+/**
+ * fc_fcp_error() - Handler for FCP layer errors
+ * @fsp: The FCP packet the error is on
+ * @fp: The frame that has errored
*/
static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
{
if (fc_fcp_lock_pkt(fsp))
return;
- switch (error) {
- case -FC_EX_CLOSED:
+ if (error == -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.
fc_fcp_unlock_pkt(fsp);
}
-/*
- * Scsi abort handler- calls to send an abort
- * and then wait for abort completion
+/**
+ * fc_fcp_pkt_abort() - Abort a fcp_pkt
+ * @fsp: The FCP packet to abort on
+ *
+ * Called 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)
+static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
{
int rc = FAILED;
fsp->wait_for_comp = 0;
if (!rc) {
- FC_DBG("target abort cmd failed\n");
+ FC_FCP_DBG(fsp, "target abort cmd failed\n");
rc = FAILED;
} else if (fsp->state & FC_SRB_ABORTED) {
- FC_DBG("target abort cmd passed\n");
+ FC_FCP_DBG(fsp, "target abort cmd passed\n");
rc = SUCCESS;
fc_fcp_complete_locked(fsp);
}
return rc;
}
-/*
- * Retry LUN reset after resource allocation failed.
+/**
+ * fc_lun_reset_send() - Send LUN reset command
+ * @data: The FCP packet that identifies the LUN to be reset
*/
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)) {
+ struct fc_lport *lport = fsp->lp;
+ if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
return;
if (fc_fcp_lock_pkt(fsp))
}
}
-/*
- * Scsi device reset handler- send a LUN RESET to the device
- * and wait for reset reply
+/**
+ * fc_lun_reset() - Send a LUN RESET command to a device
+ * and wait for the reply
+ * @lport: The local port to sent the comand on
+ * @fsp: The FCP packet that identifies the LUN to be reset
+ * @id: The SCSI command ID
+ * @lun: The LUN ID to be reset
*/
-static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
+static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
unsigned int id, unsigned int lun)
{
int rc;
spin_lock_bh(&fsp->scsi_pkt_lock);
if (fsp->seq_ptr) {
- lp->tt.exch_done(fsp->seq_ptr);
+ lport->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");
+ FC_SCSI_DBG(lport, "lun reset failed\n");
return FAILED;
}
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);
+ FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
+ fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
return SUCCESS;
}
-/*
- * Task Managment response handler
+/**
+ * fc_tm_done() - Task Managment response handler
+ * @seq: The sequence that the response is on
+ * @fp: The response frame
+ * @arg: The FCP packet the response is for
*/
static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
{
fc_fcp_unlock_pkt(fsp);
}
-static void fc_fcp_cleanup(struct fc_lport *lp)
+/**
+ * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
+ * @lport: The local port to be cleaned up
+ */
+static void fc_fcp_cleanup(struct fc_lport *lport)
{
- fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
+ fc_fcp_cleanup_each_cmd(lport, -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.
+/**
+ * fc_fcp_timeout() - Handler for fcp_pkt timeouts
+ * @data: The FCP packet that has timed out
*
- * 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.
+ * If REC is supported then 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 then 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;
+ struct fc_rport_libfc_priv *rpriv = rport->dd_data;
if (fc_fcp_lock_pkt(fsp))
return;
fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
- if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
+ if (rpriv->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_unlock_pkt(fsp);
}
-/*
- * Send a REC ELS request
+/**
+ * fc_fcp_rec() - Send a REC ELS request
+ * @fsp: The FCP packet to send the REC request on
*/
static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
{
- struct fc_lport *lp;
+ struct fc_lport *lport;
struct fc_frame *fp;
struct fc_rport *rport;
- struct fc_rport_libfc_priv *rp;
+ struct fc_rport_libfc_priv *rpriv;
- lp = fsp->lp;
+ lport = fsp->lp;
rport = fsp->rport;
- rp = rport->dd_data;
- if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
+ rpriv = rport->dd_data;
+ if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
fsp->status_code = FC_HRD_ERROR;
fsp->io_status = 0;
fc_fcp_complete_locked(fsp);
return;
}
- fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
+ fp = fc_fcp_frame_alloc(lport, 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_host_port_id(rpriv->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))) {
+ if (lport->tt.elsct_send(lport, rport->port_id, 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);
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.
+/**
+ * fc_fcp_rec_resp() - Handler for REC ELS responses
+ * @seq: The sequence the response is on
+ * @fp: The response frame
+ * @arg: The FCP packet the response is on
+ *
+ * If the response is a reject then the scsi layer will handle
+ * the timeout. If the response is a LS_ACC then if the I/O was not completed
+ * set the timeout and return. If the I/O was completed then complete the
+ * exchange and tell the SCSI layer.
*/
static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
{
u32 offset;
enum dma_data_direction data_dir;
enum fc_rctl r_ctl;
- struct fc_rport_libfc_priv *rp;
+ struct fc_rport_libfc_priv *rpriv;
if (IS_ERR(fp)) {
fc_fcp_rec_error(fsp, fp);
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);
+ FC_FCP_DBG(fsp, "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;
+ FC_FCP_DBG(fsp, "device does not support REC\n");
+ rpriv = 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;
+ rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
break;
case ELS_RJT_LOGIC:
fc_frame_free(fp);
}
-/*
- * Handle error response or timeout for REC exchange.
+/**
+ * fc_fcp_rec_error() - Handler for REC errors
+ * @fsp: The FCP packet the error is on
+ * @fp: The REC frame
*/
static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
{
break;
default:
- FC_DBG("REC %p fid %x error unexpected error %d\n",
- fsp, fsp->rport->port_id, error);
+ FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
+ fsp, fsp->rport->port_id, error);
fsp->status_code = FC_CMD_PLOGO;
/* fall through */
* 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);
+ FC_FCP_DBG(fsp, "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_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
+/**
+ * fc_timeout_error() - Handler for fcp_pkt timeouts
+ * @fsp: The FCP packt that has timed out
*/
static void fc_timeout_error(struct fc_fcp_pkt *fsp)
{
fc_fcp_send_abort(fsp);
}
-/*
- * Sequence retransmission request.
+/**
+ * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
+ * @fsp: The FCP packet the SRR is to be sent on
+ * @r_ctl: The R_CTL field for the SRR 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_lport *lport = fsp->lp;
struct fc_rport *rport;
- struct fc_rport_libfc_priv *rp;
+ struct fc_rport_libfc_priv *rpriv;
struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
struct fc_seq *seq;
struct fcp_srr *srr;
u8 cdb_op;
rport = fsp->rport;
- rp = rport->dd_data;
+ rpriv = rport->dd_data;
cdb_op = fsp->cdb_cmd.fc_cdb[0];
- if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
+ if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
+ rpriv->rp_state != RPORT_ST_READY)
goto retry; /* shouldn't happen */
- fp = fc_frame_alloc(lp, sizeof(*srr));
+ fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
if (!fp)
goto retry;
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_host_port_id(rpriv->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);
+ seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
+ fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
+ if (!seq)
goto retry;
- }
+
fsp->recov_seq = seq;
fsp->xfer_len = offset;
fsp->xfer_contig_end = offset;
fc_fcp_retry_cmd(fsp);
}
-/*
- * Handle response from SRR.
+/**
+ * fc_fcp_srr_resp() - Handler for SRR response
+ * @seq: The sequence the SRR is on
+ * @fp: The SRR frame
+ * @arg: The FCP packet the SRR is on
*/
static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
{
fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
}
+/**
+ * fc_fcp_srr_error() - Handler for SRR errors
+ * @fsp: The FCP packet that the SRR error is on
+ * @fp: The SRR frame
+ */
static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
{
if (fc_fcp_lock_pkt(fsp))
fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
}
-static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
+/**
+ * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
+ * @lport: The local port to be checked
+ */
+static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
{
/* lock ? */
- return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
+ return (lport->state == LPORT_ST_READY) &&
+ lport->link_up && !lport->qfull;
}
/**
- * 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
+ * fc_queuecommand() - The queuecommand function of the SCSI template
+ * @cmd: The scsi_cmnd to be executed
+ * @done: The callback function to be called when the scsi_cmnd is complete
*
- * this is the i/o strategy routine, called by the scsi layer
- * this routine is called with holding the host_lock.
+ * This is the i/o strategy routine, called by the SCSI layer. This routine
+ * is called with the host_lock held.
*/
int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
{
- struct fc_lport *lp;
+ struct fc_lport *lport;
struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
struct fc_fcp_pkt *fsp;
- struct fc_rport_libfc_priv *rp;
+ struct fc_rport_libfc_priv *rpriv;
int rval;
int rc = 0;
struct fcoe_dev_stats *stats;
- lp = shost_priv(sc_cmd->device->host);
+ lport = shost_priv(sc_cmd->device->host);
+ spin_unlock_irq(lport->host->host_lock);
rval = fc_remote_port_chkready(rport);
if (rval) {
goto out;
}
- rp = rport->dd_data;
+ rpriv = rport->dd_data;
- if (!fc_fcp_lport_queue_ready(lp)) {
+ if (!fc_fcp_lport_queue_ready(lport)) {
+ if (lport->qfull)
+ fc_fcp_can_queue_ramp_down(lport);
rc = SCSI_MLQUEUE_HOST_BUSY;
goto out;
}
- fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
+ fsp = fc_fcp_pkt_alloc(lport, 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->lp = lport; /* save the softc ptr */
fsp->rport = rport; /* set the remote port ptr */
+ fsp->xfer_ddp = FC_XID_UNKNOWN;
sc_cmd->scsi_done = done;
/*
/*
* setup the data direction
*/
- stats = lp->dev_stats[smp_processor_id()];
+ stats = fc_lport_get_stats(lport);
if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
fsp->req_flags = FC_SRB_READ;
stats->InputRequests++;
stats->ControlRequests++;
}
- fsp->tgt_flags = rp->flags;
+ fsp->tgt_flags = rpriv->flags;
init_timer(&fsp->timer);
fsp->timer.data = (unsigned long)fsp;
* if we get -1 return then put the request in the pending
* queue.
*/
- rval = fc_fcp_pkt_send(lp, fsp);
+ rval = fc_fcp_pkt_send(lport, fsp);
if (rval != 0) {
fsp->state = FC_SRB_FREE;
fc_fcp_pkt_release(fsp);
rc = SCSI_MLQUEUE_HOST_BUSY;
}
out:
+ spin_lock_irq(lport->host->host_lock);
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.
+ * fc_io_compl() - Handle responses for completed commands
+ * @fsp: The FCP packet that is complete
*
+ * Translates fcp_pkt errors to a Linux SCSI errors.
* 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;
+ struct fc_lport *lport;
unsigned long flags;
+ /* release outstanding ddp context */
+ fc_fcp_ddp_done(fsp);
+
fsp->state |= FC_SRB_COMPL;
if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
spin_unlock_bh(&fsp->scsi_pkt_lock);
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);
+ lport = fsp->lp;
+ si = fc_get_scsi_internal(lport);
+ if (!fsp->cmd)
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 can_queue ramp down is done then try can_queue ramp up
+ * since commands are completing now.
*/
- if (si->throttled && fsp->state & FC_SRB_NOMEM)
- si->throttled = 0;
+ if (si->last_can_queue_ramp_down_time)
+ fc_fcp_can_queue_ramp_up(lport);
sc_cmd = fsp->cmd;
fsp->cmd = NULL;
- if (!sc_cmd->SCp.ptr) {
- spin_unlock_irqrestore(lp->host->host_lock, flags);
+ if (!sc_cmd->SCp.ptr)
return;
- }
CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
switch (fsp->status_code) {
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
* scsi status is good but transport level
* underrun.
*/
- sc_cmd->result = DID_OK << 16;
+ sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
+ DID_OK : DID_ERROR) << 16;
} else {
/*
* scsi got underrun, this 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;
+ sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
break;
case FC_CMD_TIME_OUT:
sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
break;
}
+ spin_lock_irqsave(&si->scsi_queue_lock, flags);
list_del(&fsp->list);
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
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
- * @sc_cmd: scsi command to abort
+ * @sc_cmd: The SCSI command to abort
*
- * From scsi host template.
- * send ABTS to the target device and wait for the response
- * sc_cmd is the pointer to the command to be aborted.
+ * From SCSI host template.
+ * Send an ABTS to the target device and wait for the response.
*/
int fc_eh_abort(struct scsi_cmnd *sc_cmd)
{
struct fc_fcp_pkt *fsp;
- struct fc_lport *lp;
+ struct fc_lport *lport;
int rc = FAILED;
unsigned long flags;
- lp = shost_priv(sc_cmd->device->host);
- if (lp->state != LPORT_ST_READY)
+ lport = shost_priv(sc_cmd->device->host);
+ if (lport->state != LPORT_ST_READY)
return rc;
- else if (!lp->link_up)
+ else if (!lport->link_up)
return rc;
- spin_lock_irqsave(lp->host->host_lock, flags);
+ spin_lock_irqsave(lport->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);
+ spin_unlock_irqrestore(lport->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);
+ spin_unlock_irqrestore(lport->host->host_lock, flags);
if (fc_fcp_lock_pkt(fsp)) {
/* completed while we were waiting for timer to be deleted */
goto release_pkt;
}
- rc = fc_fcp_pkt_abort(lp, fsp);
+ rc = fc_fcp_pkt_abort(fsp);
fc_fcp_unlock_pkt(fsp);
release_pkt:
EXPORT_SYMBOL(fc_eh_abort);
/**
- * fc_eh_device_reset() Reset a single LUN
- * @sc_cmd: scsi command
+ * fc_eh_device_reset() - Reset a single LUN
+ * @sc_cmd: The SCSI command which identifies the device whose
+ * LUN is to be reset
*
- * Set from scsi host template to send tm cmd to the target and wait for the
- * response.
+ * Set from SCSI host template.
*/
int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
{
- struct fc_lport *lp;
+ struct fc_lport *lport;
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);
+ lport = shost_priv(sc_cmd->device->host);
- if (lp->state != LPORT_ST_READY)
+ if (lport->state != LPORT_ST_READY)
return rc;
- fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
+ FC_SCSI_DBG(lport, "Resetting rport (%6x)\n", rport->port_id);
+
+ fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
if (fsp == NULL) {
- FC_DBG("could not allocate scsi_pkt\n");
- sc_cmd->result = DID_NO_CONNECT << 16;
+ printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
goto out;
}
* the sc passed in is not setup for execution like when sent
* through the queuecommand callout.
*/
- fsp->lp = lp; /* save the softc ptr */
+ fsp->lp = lport; /* 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);
+ rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
fsp->state = FC_SRB_FREE;
fc_fcp_pkt_release(fsp);
EXPORT_SYMBOL(fc_eh_device_reset);
/**
- * fc_eh_host_reset() - The reset function will reset the ports on the host.
- * @sc_cmd: scsi command
+ * fc_eh_host_reset() - Reset a Scsi_Host.
+ * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
*/
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);
+ struct fc_lport *lport = shost_priv(shost);
unsigned long wait_tmo;
- lp->tt.lport_reset(lp);
+ FC_SCSI_DBG(lport, "Resetting host\n");
+
+ lport->tt.lport_reset(lport);
wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
- while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
+ while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
+ wait_tmo))
msleep(1000);
- if (fc_fcp_lport_queue_ready(lp)) {
- shost_printk(KERN_INFO, shost, "Host reset succeeded.\n");
+ if (fc_fcp_lport_queue_ready(lport)) {
+ shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
+ "on port (%6x)\n", fc_host_port_id(lport->host));
return SUCCESS;
} else {
- shost_printk(KERN_INFO, shost, "Host reset failed. "
- "lport not ready.\n");
+ shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
+ "port (%6x) is not ready.\n",
+ fc_host_port_id(lport->host));
return FAILED;
}
}
EXPORT_SYMBOL(fc_eh_host_reset);
/**
- * fc_slave_alloc() - configure queue depth
- * @sdev: scsi device
+ * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
+ * @sdev: The SCSI device that identifies the SCSI host
*
* 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);
- }
+ if (sdev->tagged_supported)
+ scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
+ else
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
+ FC_FCP_DFLT_QUEUE_DEPTH);
+
return 0;
}
EXPORT_SYMBOL(fc_slave_alloc);
-int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
+/**
+ * fc_change_queue_depth() - Change a device's queue depth
+ * @sdev: The SCSI device whose queue depth is to change
+ * @qdepth: The new queue depth
+ * @reason: The resason for the change
+ */
+int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
{
- scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+ switch (reason) {
+ case SCSI_QDEPTH_DEFAULT:
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+ break;
+ case SCSI_QDEPTH_QFULL:
+ scsi_track_queue_full(sdev, qdepth);
+ break;
+ case SCSI_QDEPTH_RAMP_UP:
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
return sdev->queue_depth;
}
EXPORT_SYMBOL(fc_change_queue_depth);
+/**
+ * fc_change_queue_type() - Change a device's queue type
+ * @sdev: The SCSI device whose queue depth is to change
+ * @tag_type: Identifier for queue type
+ */
int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
{
if (sdev->tagged_supported) {
}
EXPORT_SYMBOL(fc_change_queue_type);
-void fc_fcp_destroy(struct fc_lport *lp)
+/**
+ * fc_fcp_destory() - Tear down the FCP layer for a given local port
+ * @lport: The local port that no longer needs the FCP layer
+ */
+void fc_fcp_destroy(struct fc_lport *lport)
{
- struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
if (!list_empty(&si->scsi_pkt_queue))
- printk(KERN_ERR "Leaked scsi packets.\n");
+ printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
+ "port (%6x)\n", fc_host_port_id(lport->host));
mempool_destroy(si->scsi_pkt_pool);
kfree(si);
- lp->scsi_priv = NULL;
+ lport->scsi_priv = NULL;
}
EXPORT_SYMBOL(fc_fcp_destroy);
-int fc_fcp_init(struct fc_lport *lp)
+int fc_setup_fcp()
+{
+ int rc = 0;
+
+ scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
+ sizeof(struct fc_fcp_pkt),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!scsi_pkt_cachep) {
+ printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
+ "module load failed!");
+ rc = -ENOMEM;
+ }
+
+ return rc;
+}
+
+void fc_destroy_fcp()
+{
+ if (scsi_pkt_cachep)
+ kmem_cache_destroy(scsi_pkt_cachep);
+}
+
+/**
+ * fc_fcp_init() - Initialize the FCP layer for a local port
+ * @lport: The local port to initialize the exchange layer for
+ */
+int fc_fcp_init(struct fc_lport *lport)
{
int rc;
struct fc_fcp_internal *si;
- if (!lp->tt.fcp_cmd_send)
- lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
+ if (!lport->tt.fcp_cmd_send)
+ lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
- if (!lp->tt.fcp_cleanup)
- lp->tt.fcp_cleanup = fc_fcp_cleanup;
+ if (!lport->tt.fcp_cleanup)
+ lport->tt.fcp_cleanup = fc_fcp_cleanup;
- if (!lp->tt.fcp_abort_io)
- lp->tt.fcp_abort_io = fc_fcp_abort_io;
+ if (!lport->tt.fcp_abort_io)
+ lport->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;
+ lport->scsi_priv = si;
+ si->max_can_queue = lport->host->can_queue;
INIT_LIST_HEAD(&si->scsi_pkt_queue);
+ spin_lock_init(&si->scsi_queue_lock);
si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
if (!si->scsi_pkt_pool) {
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff