-/*
+/*
* iSCSI transport class definitions
*
* Copyright (C) IBM Corporation, 2004
- * Copyright (C) Mike Christie, 2004
+ * Copyright (C) Mike Christie, 2004 - 2005
+ * Copyright (C) Dmitry Yusupov, 2004 - 2005
+ * Copyright (C) Alex Aizman, 2004 - 2005
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-
+#include <linux/mutex.h>
+#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_iscsi.h>
+#include <scsi/iscsi_if.h>
+
+#define ISCSI_SESSION_ATTRS 21
+#define ISCSI_CONN_ATTRS 13
+#define ISCSI_HOST_ATTRS 4
+
+#define ISCSI_TRANSPORT_VERSION "2.0-870"
-#define ISCSI_SESSION_ATTRS 20
-#define ISCSI_HOST_ATTRS 2
+static int dbg_session;
+module_param_named(debug_session, dbg_session, int,
+ S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug_session,
+ "Turn on debugging for sessions in scsi_transport_iscsi "
+ "module. Set to 1 to turn on, and zero to turn off. Default "
+ "is off.");
+
+static int dbg_conn;
+module_param_named(debug_conn, dbg_conn, int,
+ S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug_conn,
+ "Turn on debugging for connections in scsi_transport_iscsi "
+ "module. Set to 1 to turn on, and zero to turn off. Default "
+ "is off.");
+
+#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
+ do { \
+ if (dbg_session) \
+ iscsi_cls_session_printk(KERN_INFO, _session, \
+ "%s: " dbg_fmt, \
+ __func__, ##arg); \
+ } while (0);
+
+#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
+ do { \
+ if (dbg_conn) \
+ iscsi_cls_conn_printk(KERN_INFO, _conn, \
+ "%s: " dbg_fmt, \
+ __func__, ##arg); \
+ } while (0);
struct iscsi_internal {
struct scsi_transport_template t;
- struct iscsi_function_template *fnt;
- /*
- * We do not have any private or other attrs.
- */
- struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
- struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
-};
+ struct iscsi_transport *iscsi_transport;
+ struct list_head list;
+ struct device dev;
-#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t)
+ struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
+ struct transport_container conn_cont;
+ struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
+ struct transport_container session_cont;
+ struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
+};
-static DECLARE_TRANSPORT_CLASS(iscsi_transport_class,
- "iscsi_transport",
- NULL,
- NULL,
- NULL);
+static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
+static struct workqueue_struct *iscsi_eh_timer_workq;
-static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
- "iscsi_host",
- NULL,
- NULL,
- NULL);
/*
- * iSCSI target and session attrs
+ * list of registered transports and lock that must
+ * be held while accessing list. The iscsi_transport_lock must
+ * be acquired after the rx_queue_mutex.
*/
-#define iscsi_session_show_fn(field, format) \
- \
-static ssize_t \
-show_session_##field(struct class_device *cdev, char *buf) \
-{ \
- struct scsi_target *starget = transport_class_to_starget(cdev); \
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
- \
- if (i->fnt->get_##field) \
- i->fnt->get_##field(starget); \
- return snprintf(buf, 20, format"\n", iscsi_##field(starget)); \
-}
+static LIST_HEAD(iscsi_transports);
+static DEFINE_SPINLOCK(iscsi_transport_lock);
-#define iscsi_session_rd_attr(field, format) \
- iscsi_session_show_fn(field, format) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL);
+#define to_iscsi_internal(tmpl) \
+ container_of(tmpl, struct iscsi_internal, t)
-iscsi_session_rd_attr(tpgt, "%hu");
-iscsi_session_rd_attr(tsih, "%2x");
-iscsi_session_rd_attr(max_recv_data_segment_len, "%u");
-iscsi_session_rd_attr(max_burst_len, "%u");
-iscsi_session_rd_attr(first_burst_len, "%u");
-iscsi_session_rd_attr(def_time2wait, "%hu");
-iscsi_session_rd_attr(def_time2retain, "%hu");
-iscsi_session_rd_attr(max_outstanding_r2t, "%hu");
-iscsi_session_rd_attr(erl, "%d");
+#define dev_to_iscsi_internal(_dev) \
+ container_of(_dev, struct iscsi_internal, dev)
-
-#define iscsi_session_show_bool_fn(field) \
- \
-static ssize_t \
-show_session_bool_##field(struct class_device *cdev, char *buf) \
-{ \
- struct scsi_target *starget = transport_class_to_starget(cdev); \
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
- \
- if (i->fnt->get_##field) \
- i->fnt->get_##field(starget); \
- \
- if (iscsi_##field(starget)) \
- return sprintf(buf, "Yes\n"); \
- return sprintf(buf, "No\n"); \
+static void iscsi_transport_release(struct device *dev)
+{
+ struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
+ kfree(priv);
}
-#define iscsi_session_rd_bool_attr(field) \
- iscsi_session_show_bool_fn(field) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL);
+/*
+ * iscsi_transport_class represents the iscsi_transports that are
+ * registered.
+ */
+static struct class iscsi_transport_class = {
+ .name = "iscsi_transport",
+ .dev_release = iscsi_transport_release,
+};
-iscsi_session_rd_bool_attr(initial_r2t);
-iscsi_session_rd_bool_attr(immediate_data);
-iscsi_session_rd_bool_attr(data_pdu_in_order);
-iscsi_session_rd_bool_attr(data_sequence_in_order);
+static ssize_t
+show_transport_handle(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
+ return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
+}
+static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
-#define iscsi_session_show_digest_fn(field) \
- \
+#define show_transport_attr(name, format) \
static ssize_t \
-show_##field(struct class_device *cdev, char *buf) \
+show_transport_##name(struct device *dev, \
+ struct device_attribute *attr,char *buf) \
{ \
- struct scsi_target *starget = transport_class_to_starget(cdev); \
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
- \
- if (i->fnt->get_##field) \
- i->fnt->get_##field(starget); \
- \
- if (iscsi_##field(starget)) \
- return sprintf(buf, "CRC32C\n"); \
- return sprintf(buf, "None\n"); \
-}
+ struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
+ return sprintf(buf, format"\n", priv->iscsi_transport->name); \
+} \
+static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
+
+show_transport_attr(caps, "0x%x");
+
+static struct attribute *iscsi_transport_attrs[] = {
+ &dev_attr_handle.attr,
+ &dev_attr_caps.attr,
+ NULL,
+};
+
+static struct attribute_group iscsi_transport_group = {
+ .attrs = iscsi_transport_attrs,
+};
+
+/*
+ * iSCSI endpoint attrs
+ */
+#define iscsi_dev_to_endpoint(_dev) \
+ container_of(_dev, struct iscsi_endpoint, dev)
+
+#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
+struct device_attribute dev_attr_##_prefix##_##_name = \
+ __ATTR(_name,_mode,_show,_store)
-#define iscsi_session_rd_digest_attr(field) \
- iscsi_session_show_digest_fn(field) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
+static void iscsi_endpoint_release(struct device *dev)
+{
+ struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
+ kfree(ep);
+}
-iscsi_session_rd_digest_attr(header_digest);
-iscsi_session_rd_digest_attr(data_digest);
+static struct class iscsi_endpoint_class = {
+ .name = "iscsi_endpoint",
+ .dev_release = iscsi_endpoint_release,
+};
static ssize_t
-show_port(struct class_device *cdev, char *buf)
+show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct scsi_target *starget = transport_class_to_starget(cdev);
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
+ struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
+ return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
+}
+static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
+
+static struct attribute *iscsi_endpoint_attrs[] = {
+ &dev_attr_ep_handle.attr,
+ NULL,
+};
- if (i->fnt->get_port)
- i->fnt->get_port(starget);
+static struct attribute_group iscsi_endpoint_group = {
+ .attrs = iscsi_endpoint_attrs,
+};
+
+#define ISCSI_MAX_EPID -1
+
+static int iscsi_match_epid(struct device *dev, void *data)
+{
+ struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
+ uint64_t *epid = (uint64_t *) data;
- return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget)));
+ return *epid == ep->id;
}
-static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
-static ssize_t
-show_ip_address(struct class_device *cdev, char *buf)
+struct iscsi_endpoint *
+iscsi_create_endpoint(int dd_size)
{
- struct scsi_target *starget = transport_class_to_starget(cdev);
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
+ struct device *dev;
+ struct iscsi_endpoint *ep;
+ uint64_t id;
+ int err;
+
+ for (id = 1; id < ISCSI_MAX_EPID; id++) {
+ dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
+ iscsi_match_epid);
+ if (!dev)
+ break;
+ }
+ if (id == ISCSI_MAX_EPID) {
+ printk(KERN_ERR "Too many connections. Max supported %u\n",
+ ISCSI_MAX_EPID - 1);
+ return NULL;
+ }
+
+ ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
+ if (!ep)
+ return NULL;
+
+ ep->id = id;
+ ep->dev.class = &iscsi_endpoint_class;
+ dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
+ err = device_register(&ep->dev);
+ if (err)
+ goto free_ep;
- if (i->fnt->get_ip_address)
- i->fnt->get_ip_address(starget);
+ err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
+ if (err)
+ goto unregister_dev;
+
+ if (dd_size)
+ ep->dd_data = &ep[1];
+ return ep;
- if (iscsi_addr_type(starget) == AF_INET)
- return sprintf(buf, "%u.%u.%u.%u\n",
- NIPQUAD(iscsi_sin_addr(starget)));
- else if(iscsi_addr_type(starget) == AF_INET6)
- return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- NIP6(iscsi_sin6_addr(starget)));
- return -EINVAL;
+unregister_dev:
+ device_unregister(&ep->dev);
+ return NULL;
+
+free_ep:
+ kfree(ep);
+ return NULL;
}
-static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL);
+EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
-static ssize_t
-show_isid(struct class_device *cdev, char *buf)
+void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
{
- struct scsi_target *starget = transport_class_to_starget(cdev);
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
+ sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
+ device_unregister(&ep->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
+
+struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
+{
+ struct iscsi_endpoint *ep;
+ struct device *dev;
- if (i->fnt->get_isid)
- i->fnt->get_isid(starget);
+ dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
+ iscsi_match_epid);
+ if (!dev)
+ return NULL;
- return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
- iscsi_isid(starget)[0], iscsi_isid(starget)[1],
- iscsi_isid(starget)[2], iscsi_isid(starget)[3],
- iscsi_isid(starget)[4], iscsi_isid(starget)[5]);
+ ep = iscsi_dev_to_endpoint(dev);
+ /*
+ * we can drop this now because the interface will prevent
+ * removals and lookups from racing.
+ */
+ put_device(dev);
+ return ep;
}
-static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL);
+EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
-/*
- * This is used for iSCSI names. Normally, we follow
- * the transport class convention of having the lld
- * set the field, but in these cases the value is
- * too large.
- */
-#define iscsi_session_show_str_fn(field) \
- \
-static ssize_t \
-show_session_str_##field(struct class_device *cdev, char *buf) \
-{ \
- ssize_t ret = 0; \
- struct scsi_target *starget = transport_class_to_starget(cdev); \
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
- \
- if (i->fnt->get_##field) \
- ret = i->fnt->get_##field(starget, buf, PAGE_SIZE); \
- return ret; \
+static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
+ struct device *cdev)
+{
+ struct Scsi_Host *shost = dev_to_shost(dev);
+ struct iscsi_cls_host *ihost = shost->shost_data;
+
+ memset(ihost, 0, sizeof(*ihost));
+ atomic_set(&ihost->nr_scans, 0);
+ mutex_init(&ihost->mutex);
+ return 0;
}
-#define iscsi_session_rd_str_attr(field) \
- iscsi_session_show_str_fn(field) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL);
+static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
+ "iscsi_host",
+ iscsi_setup_host,
+ NULL,
+ NULL);
+
+static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
+ "iscsi_session",
+ NULL,
+ NULL,
+ NULL);
+
+static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
+ "iscsi_connection",
+ NULL,
+ NULL,
+ NULL);
+
+static struct sock *nls;
+static DEFINE_MUTEX(rx_queue_mutex);
+
+static LIST_HEAD(sesslist);
+static DEFINE_SPINLOCK(sesslock);
+static LIST_HEAD(connlist);
+static DEFINE_SPINLOCK(connlock);
-iscsi_session_rd_str_attr(target_name);
-iscsi_session_rd_str_attr(target_alias);
+static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
+{
+ struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
+ return sess->sid;
+}
/*
- * iSCSI host attrs
+ * Returns the matching session to a given sid
*/
+static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
+{
+ unsigned long flags;
+ struct iscsi_cls_session *sess;
+
+ spin_lock_irqsave(&sesslock, flags);
+ list_for_each_entry(sess, &sesslist, sess_list) {
+ if (sess->sid == sid) {
+ spin_unlock_irqrestore(&sesslock, flags);
+ return sess;
+ }
+ }
+ spin_unlock_irqrestore(&sesslock, flags);
+ return NULL;
+}
/*
- * Again, this is used for iSCSI names. Normally, we follow
- * the transport class convention of having the lld set
- * the field, but in these cases the value is too large.
+ * Returns the matching connection to a given sid / cid tuple
*/
-#define iscsi_host_show_str_fn(field) \
- \
-static ssize_t \
-show_host_str_##field(struct class_device *cdev, char *buf) \
-{ \
- int ret = 0; \
- struct Scsi_Host *shost = transport_class_to_shost(cdev); \
- struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \
- \
- if (i->fnt->get_##field) \
- ret = i->fnt->get_##field(shost, buf, PAGE_SIZE); \
- return ret; \
+static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
+{
+ unsigned long flags;
+ struct iscsi_cls_conn *conn;
+
+ spin_lock_irqsave(&connlock, flags);
+ list_for_each_entry(conn, &connlist, conn_list) {
+ if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
+ spin_unlock_irqrestore(&connlock, flags);
+ return conn;
+ }
+ }
+ spin_unlock_irqrestore(&connlock, flags);
+ return NULL;
}
-#define iscsi_host_rd_str_attr(field) \
- iscsi_host_show_str_fn(field) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL);
+/*
+ * The following functions can be used by LLDs that allocate
+ * their own scsi_hosts or by software iscsi LLDs
+ */
+static struct {
+ int value;
+ char *name;
+} iscsi_session_state_names[] = {
+ { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
+ { ISCSI_SESSION_FAILED, "FAILED" },
+ { ISCSI_SESSION_FREE, "FREE" },
+};
-iscsi_host_rd_str_attr(initiator_name);
-iscsi_host_rd_str_attr(initiator_alias);
+static const char *iscsi_session_state_name(int state)
+{
+ int i;
+ char *name = NULL;
-#define SETUP_SESSION_RD_ATTR(field) \
- if (i->fnt->show_##field) { \
- i->session_attrs[count] = &class_device_attr_##field; \
- count++; \
+ for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
+ if (iscsi_session_state_names[i].value == state) {
+ name = iscsi_session_state_names[i].name;
+ break;
+ }
}
+ return name;
+}
-#define SETUP_HOST_RD_ATTR(field) \
- if (i->fnt->show_##field) { \
- i->host_attrs[count] = &class_device_attr_##field; \
- count++; \
+int iscsi_session_chkready(struct iscsi_cls_session *session)
+{
+ unsigned long flags;
+ int err;
+
+ spin_lock_irqsave(&session->lock, flags);
+ switch (session->state) {
+ case ISCSI_SESSION_LOGGED_IN:
+ err = 0;
+ break;
+ case ISCSI_SESSION_FAILED:
+ err = DID_IMM_RETRY << 16;
+ break;
+ case ISCSI_SESSION_FREE:
+ err = DID_TRANSPORT_FAILFAST << 16;
+ break;
+ default:
+ err = DID_NO_CONNECT << 16;
+ break;
}
+ spin_unlock_irqrestore(&session->lock, flags);
+ return err;
+}
+EXPORT_SYMBOL_GPL(iscsi_session_chkready);
-static int iscsi_host_match(struct attribute_container *cont,
- struct device *dev)
+static void iscsi_session_release(struct device *dev)
{
+ struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
struct Scsi_Host *shost;
- struct iscsi_internal *i;
- if (!scsi_is_host_device(dev))
- return 0;
+ shost = iscsi_session_to_shost(session);
+ scsi_host_put(shost);
+ ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
+ kfree(session);
+}
- shost = dev_to_shost(dev);
- if (!shost->transportt || shost->transportt->host_attrs.ac.class
- != &iscsi_host_class.class)
+static int iscsi_is_session_dev(const struct device *dev)
+{
+ return dev->release == iscsi_session_release;
+}
+
+static int iscsi_iter_session_fn(struct device *dev, void *data)
+{
+ void (* fn) (struct iscsi_cls_session *) = data;
+
+ if (!iscsi_is_session_dev(dev))
return 0;
+ fn(iscsi_dev_to_session(dev));
+ return 0;
+}
+
+void iscsi_host_for_each_session(struct Scsi_Host *shost,
+ void (*fn)(struct iscsi_cls_session *))
+{
+ device_for_each_child(&shost->shost_gendev, fn,
+ iscsi_iter_session_fn);
+}
+EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
- i = to_iscsi_internal(shost->transportt);
-
- return &i->t.host_attrs.ac == cont;
+/**
+ * iscsi_scan_finished - helper to report when running scans are done
+ * @shost: scsi host
+ * @time: scan run time
+ *
+ * This function can be used by drives like qla4xxx to report to the scsi
+ * layer when the scans it kicked off at module load time are done.
+ */
+int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
+{
+ struct iscsi_cls_host *ihost = shost->shost_data;
+ /*
+ * qla4xxx will have kicked off some session unblocks before calling
+ * scsi_scan_host, so just wait for them to complete.
+ */
+ return !atomic_read(&ihost->nr_scans);
}
+EXPORT_SYMBOL_GPL(iscsi_scan_finished);
-static int iscsi_target_match(struct attribute_container *cont,
- struct device *dev)
+struct iscsi_scan_data {
+ unsigned int channel;
+ unsigned int id;
+ unsigned int lun;
+};
+
+static int iscsi_user_scan_session(struct device *dev, void *data)
{
+ struct iscsi_scan_data *scan_data = data;
+ struct iscsi_cls_session *session;
struct Scsi_Host *shost;
- struct iscsi_internal *i;
+ struct iscsi_cls_host *ihost;
+ unsigned long flags;
+ unsigned int id;
- if (!scsi_is_target_device(dev))
+ if (!iscsi_is_session_dev(dev))
return 0;
- shost = dev_to_shost(dev->parent);
- if (!shost->transportt || shost->transportt->host_attrs.ac.class
- != &iscsi_host_class.class)
- return 0;
+ session = iscsi_dev_to_session(dev);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
+
+ shost = iscsi_session_to_shost(session);
+ ihost = shost->shost_data;
+
+ mutex_lock(&ihost->mutex);
+ spin_lock_irqsave(&session->lock, flags);
+ if (session->state != ISCSI_SESSION_LOGGED_IN) {
+ spin_unlock_irqrestore(&session->lock, flags);
+ goto user_scan_exit;
+ }
+ id = session->target_id;
+ spin_unlock_irqrestore(&session->lock, flags);
+
+ if (id != ISCSI_MAX_TARGET) {
+ if ((scan_data->channel == SCAN_WILD_CARD ||
+ scan_data->channel == 0) &&
+ (scan_data->id == SCAN_WILD_CARD ||
+ scan_data->id == id))
+ scsi_scan_target(&session->dev, 0, id,
+ scan_data->lun, 1);
+ }
- i = to_iscsi_internal(shost->transportt);
-
- return &i->t.target_attrs.ac == cont;
+user_scan_exit:
+ mutex_unlock(&ihost->mutex);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
+ return 0;
}
-struct scsi_transport_template *
-iscsi_attach_transport(struct iscsi_function_template *fnt)
+static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
+ uint id, uint lun)
+{
+ struct iscsi_scan_data scan_data;
+
+ scan_data.channel = channel;
+ scan_data.id = id;
+ scan_data.lun = lun;
+
+ return device_for_each_child(&shost->shost_gendev, &scan_data,
+ iscsi_user_scan_session);
+}
+
+static void iscsi_scan_session(struct work_struct *work)
+{
+ struct iscsi_cls_session *session =
+ container_of(work, struct iscsi_cls_session, scan_work);
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ struct iscsi_cls_host *ihost = shost->shost_data;
+ struct iscsi_scan_data scan_data;
+
+ scan_data.channel = 0;
+ scan_data.id = SCAN_WILD_CARD;
+ scan_data.lun = SCAN_WILD_CARD;
+
+ iscsi_user_scan_session(&session->dev, &scan_data);
+ atomic_dec(&ihost->nr_scans);
+}
+
+static void session_recovery_timedout(struct work_struct *work)
+{
+ struct iscsi_cls_session *session =
+ container_of(work, struct iscsi_cls_session,
+ recovery_work.work);
+ unsigned long flags;
+
+ iscsi_cls_session_printk(KERN_INFO, session,
+ "session recovery timed out after %d secs\n",
+ session->recovery_tmo);
+
+ spin_lock_irqsave(&session->lock, flags);
+ switch (session->state) {
+ case ISCSI_SESSION_FAILED:
+ session->state = ISCSI_SESSION_FREE;
+ break;
+ case ISCSI_SESSION_LOGGED_IN:
+ case ISCSI_SESSION_FREE:
+ /* we raced with the unblock's flush */
+ spin_unlock_irqrestore(&session->lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&session->lock, flags);
+
+ if (session->transport->session_recovery_timedout)
+ session->transport->session_recovery_timedout(session);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
+ scsi_target_unblock(&session->dev);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
+}
+
+static void __iscsi_unblock_session(struct work_struct *work)
+{
+ struct iscsi_cls_session *session =
+ container_of(work, struct iscsi_cls_session,
+ unblock_work);
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ struct iscsi_cls_host *ihost = shost->shost_data;
+ unsigned long flags;
+
+ ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
+ /*
+ * The recovery and unblock work get run from the same workqueue,
+ * so try to cancel it if it was going to run after this unblock.
+ */
+ cancel_delayed_work(&session->recovery_work);
+ spin_lock_irqsave(&session->lock, flags);
+ session->state = ISCSI_SESSION_LOGGED_IN;
+ spin_unlock_irqrestore(&session->lock, flags);
+ /* start IO */
+ scsi_target_unblock(&session->dev);
+ /*
+ * Only do kernel scanning if the driver is properly hooked into
+ * the async scanning code (drivers like iscsi_tcp do login and
+ * scanning from userspace).
+ */
+ if (shost->hostt->scan_finished) {
+ if (scsi_queue_work(shost, &session->scan_work))
+ atomic_inc(&ihost->nr_scans);
+ }
+ ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
+}
+
+/**
+ * iscsi_unblock_session - set a session as logged in and start IO.
+ * @session: iscsi session
+ *
+ * Mark a session as ready to accept IO.
+ */
+void iscsi_unblock_session(struct iscsi_cls_session *session)
+{
+ queue_work(iscsi_eh_timer_workq, &session->unblock_work);
+ /*
+ * make sure all the events have completed before tell the driver
+ * it is safe
+ */
+ flush_workqueue(iscsi_eh_timer_workq);
+}
+EXPORT_SYMBOL_GPL(iscsi_unblock_session);
+
+static void __iscsi_block_session(struct work_struct *work)
+{
+ struct iscsi_cls_session *session =
+ container_of(work, struct iscsi_cls_session,
+ block_work);
+ unsigned long flags;
+
+ ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
+ spin_lock_irqsave(&session->lock, flags);
+ session->state = ISCSI_SESSION_FAILED;
+ spin_unlock_irqrestore(&session->lock, flags);
+ scsi_target_block(&session->dev);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
+ queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
+ session->recovery_tmo * HZ);
+}
+
+void iscsi_block_session(struct iscsi_cls_session *session)
{
- struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
- GFP_KERNEL);
- int count = 0;
+ queue_work(iscsi_eh_timer_workq, &session->block_work);
+}
+EXPORT_SYMBOL_GPL(iscsi_block_session);
+
+static void __iscsi_unbind_session(struct work_struct *work)
+{
+ struct iscsi_cls_session *session =
+ container_of(work, struct iscsi_cls_session,
+ unbind_work);
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ struct iscsi_cls_host *ihost = shost->shost_data;
+ unsigned long flags;
+
+ ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
+
+ /* Prevent new scans and make sure scanning is not in progress */
+ mutex_lock(&ihost->mutex);
+ spin_lock_irqsave(&session->lock, flags);
+ if (session->target_id == ISCSI_MAX_TARGET) {
+ spin_unlock_irqrestore(&session->lock, flags);
+ mutex_unlock(&ihost->mutex);
+ return;
+ }
+ session->target_id = ISCSI_MAX_TARGET;
+ spin_unlock_irqrestore(&session->lock, flags);
+ mutex_unlock(&ihost->mutex);
+
+ scsi_remove_target(&session->dev);
+ iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
+}
- if (unlikely(!i))
+struct iscsi_cls_session *
+iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
+ int dd_size)
+{
+ struct iscsi_cls_session *session;
+
+ session = kzalloc(sizeof(*session) + dd_size,
+ GFP_KERNEL);
+ if (!session)
return NULL;
- memset(i, 0, sizeof(struct iscsi_internal));
- i->fnt = fnt;
-
- i->t.target_attrs.ac.attrs = &i->session_attrs[0];
- i->t.target_attrs.ac.class = &iscsi_transport_class.class;
- i->t.target_attrs.ac.match = iscsi_target_match;
- transport_container_register(&i->t.target_attrs);
- i->t.target_size = sizeof(struct iscsi_class_session);
-
- SETUP_SESSION_RD_ATTR(tsih);
- SETUP_SESSION_RD_ATTR(isid);
- SETUP_SESSION_RD_ATTR(header_digest);
- SETUP_SESSION_RD_ATTR(data_digest);
- SETUP_SESSION_RD_ATTR(target_name);
- SETUP_SESSION_RD_ATTR(target_alias);
- SETUP_SESSION_RD_ATTR(port);
- SETUP_SESSION_RD_ATTR(tpgt);
- SETUP_SESSION_RD_ATTR(ip_address);
- SETUP_SESSION_RD_ATTR(initial_r2t);
- SETUP_SESSION_RD_ATTR(immediate_data);
- SETUP_SESSION_RD_ATTR(max_recv_data_segment_len);
- SETUP_SESSION_RD_ATTR(max_burst_len);
- SETUP_SESSION_RD_ATTR(first_burst_len);
- SETUP_SESSION_RD_ATTR(def_time2wait);
- SETUP_SESSION_RD_ATTR(def_time2retain);
- SETUP_SESSION_RD_ATTR(max_outstanding_r2t);
- SETUP_SESSION_RD_ATTR(data_pdu_in_order);
- SETUP_SESSION_RD_ATTR(data_sequence_in_order);
- SETUP_SESSION_RD_ATTR(erl);
+ session->transport = transport;
+ session->recovery_tmo = 120;
+ session->state = ISCSI_SESSION_FREE;
+ INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
+ INIT_LIST_HEAD(&session->sess_list);
+ INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
+ INIT_WORK(&session->block_work, __iscsi_block_session);
+ INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
+ INIT_WORK(&session->scan_work, iscsi_scan_session);
+ spin_lock_init(&session->lock);
- BUG_ON(count > ISCSI_SESSION_ATTRS);
- i->session_attrs[count] = NULL;
+ /* this is released in the dev's release function */
+ scsi_host_get(shost);
+ session->dev.parent = &shost->shost_gendev;
+ session->dev.release = iscsi_session_release;
+ device_initialize(&session->dev);
+ if (dd_size)
+ session->dd_data = &session[1];
- i->t.host_attrs.ac.attrs = &i->host_attrs[0];
- i->t.host_attrs.ac.class = &iscsi_host_class.class;
- i->t.host_attrs.ac.match = iscsi_host_match;
- transport_container_register(&i->t.host_attrs);
- i->t.host_size = 0;
+ ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
+ return session;
+}
+EXPORT_SYMBOL_GPL(iscsi_alloc_session);
- count = 0;
- SETUP_HOST_RD_ATTR(initiator_name);
- SETUP_HOST_RD_ATTR(initiator_alias);
+static int iscsi_get_next_target_id(struct device *dev, void *data)
+{
+ struct iscsi_cls_session *session;
+ unsigned long flags;
+ int err = 0;
- BUG_ON(count > ISCSI_HOST_ATTRS);
- i->host_attrs[count] = NULL;
+ if (!iscsi_is_session_dev(dev))
+ return 0;
- return &i->t;
+ session = iscsi_dev_to_session(dev);
+ spin_lock_irqsave(&session->lock, flags);
+ if (*((unsigned int *) data) == session->target_id)
+ err = -EEXIST;
+ spin_unlock_irqrestore(&session->lock, flags);
+ return err;
}
-EXPORT_SYMBOL(iscsi_attach_transport);
+int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ struct iscsi_cls_host *ihost;
+ unsigned long flags;
+ unsigned int id = target_id;
+ int err;
+
+ ihost = shost->shost_data;
+ session->sid = atomic_add_return(1, &iscsi_session_nr);
+
+ if (id == ISCSI_MAX_TARGET) {
+ for (id = 0; id < ISCSI_MAX_TARGET; id++) {
+ err = device_for_each_child(&shost->shost_gendev, &id,
+ iscsi_get_next_target_id);
+ if (!err)
+ break;
+ }
+
+ if (id == ISCSI_MAX_TARGET) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "Too many iscsi targets. Max "
+ "number of targets is %d.\n",
+ ISCSI_MAX_TARGET - 1);
+ err = -EOVERFLOW;
+ goto release_host;
+ }
+ }
+ session->target_id = id;
+
+ dev_set_name(&session->dev, "session%u", session->sid);
+ err = device_add(&session->dev);
+ if (err) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "could not register session's dev\n");
+ goto release_host;
+ }
+ transport_register_device(&session->dev);
+
+ spin_lock_irqsave(&sesslock, flags);
+ list_add(&session->sess_list, &sesslist);
+ spin_unlock_irqrestore(&sesslock, flags);
+
+ iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
+ return 0;
+
+release_host:
+ scsi_host_put(shost);
+ return err;
+}
+EXPORT_SYMBOL_GPL(iscsi_add_session);
+
+/**
+ * iscsi_create_session - create iscsi class session
+ * @shost: scsi host
+ * @transport: iscsi transport
+ * @dd_size: private driver data size
+ * @target_id: which target
+ *
+ * This can be called from a LLD or iscsi_transport.
+ */
+struct iscsi_cls_session *
+iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
+ int dd_size, unsigned int target_id)
+{
+ struct iscsi_cls_session *session;
+
+ session = iscsi_alloc_session(shost, transport, dd_size);
+ if (!session)
+ return NULL;
+
+ if (iscsi_add_session(session, target_id)) {
+ iscsi_free_session(session);
+ return NULL;
+ }
+ return session;
+}
+EXPORT_SYMBOL_GPL(iscsi_create_session);
-void iscsi_release_transport(struct scsi_transport_template *t)
+static void iscsi_conn_release(struct device *dev)
{
- struct iscsi_internal *i = to_iscsi_internal(t);
+ struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
+ struct device *parent = conn->dev.parent;
- transport_container_unregister(&i->t.target_attrs);
- transport_container_unregister(&i->t.host_attrs);
-
- kfree(i);
+ ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
+ kfree(conn);
+ put_device(parent);
}
-EXPORT_SYMBOL(iscsi_release_transport);
+static int iscsi_is_conn_dev(const struct device *dev)
+{
+ return dev->release == iscsi_conn_release;
+}
-static __init int iscsi_transport_init(void)
+static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
{
- int err = transport_class_register(&iscsi_transport_class);
+ if (!iscsi_is_conn_dev(dev))
+ return 0;
+ return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
+}
+
+void iscsi_remove_session(struct iscsi_cls_session *session)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ unsigned long flags;
+ int err;
+
+ ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
+
+ spin_lock_irqsave(&sesslock, flags);
+ list_del(&session->sess_list);
+ spin_unlock_irqrestore(&sesslock, flags);
+
+ /* make sure there are no blocks/unblocks queued */
+ flush_workqueue(iscsi_eh_timer_workq);
+ /* make sure the timedout callout is not running */
+ if (!cancel_delayed_work(&session->recovery_work))
+ flush_workqueue(iscsi_eh_timer_workq);
+ /*
+ * If we are blocked let commands flow again. The lld or iscsi
+ * layer should set up the queuecommand to fail commands.
+ * We assume that LLD will not be calling block/unblock while
+ * removing the session.
+ */
+ spin_lock_irqsave(&session->lock, flags);
+ session->state = ISCSI_SESSION_FREE;
+ spin_unlock_irqrestore(&session->lock, flags);
+
+ scsi_target_unblock(&session->dev);
+ /* flush running scans then delete devices */
+ scsi_flush_work(shost);
+ __iscsi_unbind_session(&session->unbind_work);
+ /* hw iscsi may not have removed all connections from session */
+ err = device_for_each_child(&session->dev, NULL,
+ iscsi_iter_destroy_conn_fn);
if (err)
- return err;
- return transport_class_register(&iscsi_host_class);
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "Could not delete all connections "
+ "for session. Error %d.\n", err);
+
+ transport_unregister_device(&session->dev);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
+ device_del(&session->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_remove_session);
+
+void iscsi_free_session(struct iscsi_cls_session *session)
+{
+ ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
+ iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
+ put_device(&session->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_free_session);
+
+/**
+ * iscsi_destroy_session - destroy iscsi session
+ * @session: iscsi_session
+ *
+ * Can be called by a LLD or iscsi_transport. There must not be
+ * any running connections.
+ */
+int iscsi_destroy_session(struct iscsi_cls_session *session)
+{
+ iscsi_remove_session(session);
+ ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
+ iscsi_free_session(session);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_destroy_session);
+
+/**
+ * iscsi_create_conn - create iscsi class connection
+ * @session: iscsi cls session
+ * @dd_size: private driver data size
+ * @cid: connection id
+ *
+ * This can be called from a LLD or iscsi_transport. The connection
+ * is child of the session so cid must be unique for all connections
+ * on the session.
+ *
+ * Since we do not support MCS, cid will normally be zero. In some cases
+ * for software iscsi we could be trying to preallocate a connection struct
+ * in which case there could be two connection structs and cid would be
+ * non-zero.
+ */
+struct iscsi_cls_conn *
+iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
+{
+ struct iscsi_transport *transport = session->transport;
+ struct iscsi_cls_conn *conn;
+ unsigned long flags;
+ int err;
+
+ conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
+ if (!conn)
+ return NULL;
+ if (dd_size)
+ conn->dd_data = &conn[1];
+
+ INIT_LIST_HEAD(&conn->conn_list);
+ conn->transport = transport;
+ conn->cid = cid;
+
+ /* this is released in the dev's release function */
+ if (!get_device(&session->dev))
+ goto free_conn;
+
+ dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
+ conn->dev.parent = &session->dev;
+ conn->dev.release = iscsi_conn_release;
+ err = device_register(&conn->dev);
+ if (err) {
+ iscsi_cls_session_printk(KERN_ERR, session, "could not "
+ "register connection's dev\n");
+ goto release_parent_ref;
+ }
+ transport_register_device(&conn->dev);
+
+ spin_lock_irqsave(&connlock, flags);
+ list_add(&conn->conn_list, &connlist);
+ conn->active = 1;
+ spin_unlock_irqrestore(&connlock, flags);
+
+ ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
+ return conn;
+
+release_parent_ref:
+ put_device(&session->dev);
+free_conn:
+ kfree(conn);
+ return NULL;
+}
+
+EXPORT_SYMBOL_GPL(iscsi_create_conn);
+
+/**
+ * iscsi_destroy_conn - destroy iscsi class connection
+ * @conn: iscsi cls session
+ *
+ * This can be called from a LLD or iscsi_transport.
+ */
+int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&connlock, flags);
+ conn->active = 0;
+ list_del(&conn->conn_list);
+ spin_unlock_irqrestore(&connlock, flags);
+
+ transport_unregister_device(&conn->dev);
+ ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
+ device_unregister(&conn->dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
+
+/*
+ * iscsi interface functions
+ */
+static struct iscsi_internal *
+iscsi_if_transport_lookup(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_for_each_entry(priv, &iscsi_transports, list) {
+ if (tt == priv->iscsi_transport) {
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+ return priv;
+ }
+ }
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+ return NULL;
+}
+
+static int
+iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
+{
+ return nlmsg_multicast(nls, skb, 0, group, gfp);
+}
+
+int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ char *pdu;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
+ data_size);
+
+ priv = iscsi_if_transport_lookup(conn->transport);
+ if (!priv)
+ return -EINVAL;
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
+ iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
+ "control PDU: OOM\n");
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ memset(ev, 0, sizeof(*ev));
+ ev->transport_handle = iscsi_handle(conn->transport);
+ ev->type = ISCSI_KEVENT_RECV_PDU;
+ ev->r.recv_req.cid = conn->cid;
+ ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
+ pdu = (char*)ev + sizeof(*ev);
+ memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
+ memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
+
+ return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
+}
+EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
+
+int iscsi_offload_mesg(struct Scsi_Host *shost,
+ struct iscsi_transport *transport, uint32_t type,
+ char *data, uint16_t data_size)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ int len = NLMSG_SPACE(sizeof(*ev) + data_size);
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ memset(ev, 0, sizeof(*ev));
+ ev->type = type;
+ ev->transport_handle = iscsi_handle(transport);
+ switch (type) {
+ case ISCSI_KEVENT_PATH_REQ:
+ ev->r.req_path.host_no = shost->host_no;
+ break;
+ case ISCSI_KEVENT_IF_DOWN:
+ ev->r.notify_if_down.host_no = shost->host_no;
+ break;
+ }
+
+ memcpy((char *)ev + sizeof(*ev), data, data_size);
+
+ return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
+}
+EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
+
+void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev));
+
+ priv = iscsi_if_transport_lookup(conn->transport);
+ if (!priv)
+ return;
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
+ "conn error (%d)\n", error);
+ return;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ ev->transport_handle = iscsi_handle(conn->transport);
+ ev->type = ISCSI_KEVENT_CONN_ERROR;
+ ev->r.connerror.error = error;
+ ev->r.connerror.cid = conn->cid;
+ ev->r.connerror.sid = iscsi_conn_get_sid(conn);
+
+ iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
+
+ iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
+ error);
+}
+EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
+
+static int
+iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
+ void *payload, int size)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ int len = NLMSG_SPACE(size);
+ int flags = multi ? NLM_F_MULTI : 0;
+ int t = done ? NLMSG_DONE : type;
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ printk(KERN_ERR "Could not allocate skb to send reply.\n");
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
+ nlh->nlmsg_flags = flags;
+ memcpy(NLMSG_DATA(nlh), payload, size);
+ return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
+}
+
+static int
+iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
+{
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+ struct iscsi_stats *stats;
+ struct sk_buff *skbstat;
+ struct iscsi_cls_conn *conn;
+ struct nlmsghdr *nlhstat;
+ struct iscsi_uevent *evstat;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev) +
+ sizeof(struct iscsi_stats) +
+ sizeof(struct iscsi_stats_custom) *
+ ISCSI_STATS_CUSTOM_MAX);
+ int err = 0;
+
+ priv = iscsi_if_transport_lookup(transport);
+ if (!priv)
+ return -EINVAL;
+
+ conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
+ if (!conn)
+ return -EEXIST;
+
+ do {
+ int actual_size;
+
+ skbstat = alloc_skb(len, GFP_ATOMIC);
+ if (!skbstat) {
+ iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
+ "deliver stats: OOM\n");
+ return -ENOMEM;
+ }
+
+ nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
+ (len - sizeof(*nlhstat)), 0);
+ evstat = NLMSG_DATA(nlhstat);
+ memset(evstat, 0, sizeof(*evstat));
+ evstat->transport_handle = iscsi_handle(conn->transport);
+ evstat->type = nlh->nlmsg_type;
+ evstat->u.get_stats.cid =
+ ev->u.get_stats.cid;
+ evstat->u.get_stats.sid =
+ ev->u.get_stats.sid;
+ stats = (struct iscsi_stats *)
+ ((char*)evstat + sizeof(*evstat));
+ memset(stats, 0, sizeof(*stats));
+
+ transport->get_stats(conn, stats);
+ actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
+ sizeof(struct iscsi_stats) +
+ sizeof(struct iscsi_stats_custom) *
+ stats->custom_length);
+ actual_size -= sizeof(*nlhstat);
+ actual_size = NLMSG_LENGTH(actual_size);
+ skb_trim(skbstat, NLMSG_ALIGN(actual_size));
+ nlhstat->nlmsg_len = actual_size;
+
+ err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
+ GFP_ATOMIC);
+ } while (err < 0 && err != -ECONNREFUSED);
+
+ return err;
+}
+
+/**
+ * iscsi_session_event - send session destr. completion event
+ * @session: iscsi class session
+ * @event: type of event
+ */
+int iscsi_session_event(struct iscsi_cls_session *session,
+ enum iscsi_uevent_e event)
+{
+ struct iscsi_internal *priv;
+ struct Scsi_Host *shost;
+ struct iscsi_uevent *ev;
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ int rc, len = NLMSG_SPACE(sizeof(*ev));
+
+ priv = iscsi_if_transport_lookup(session->transport);
+ if (!priv)
+ return -EINVAL;
+ shost = iscsi_session_to_shost(session);
+
+ skb = alloc_skb(len, GFP_KERNEL);
+ if (!skb) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "Cannot notify userspace of session "
+ "event %u\n", event);
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ ev->transport_handle = iscsi_handle(session->transport);
+
+ ev->type = event;
+ switch (event) {
+ case ISCSI_KEVENT_DESTROY_SESSION:
+ ev->r.d_session.host_no = shost->host_no;
+ ev->r.d_session.sid = session->sid;
+ break;
+ case ISCSI_KEVENT_CREATE_SESSION:
+ ev->r.c_session_ret.host_no = shost->host_no;
+ ev->r.c_session_ret.sid = session->sid;
+ break;
+ case ISCSI_KEVENT_UNBIND_SESSION:
+ ev->r.unbind_session.host_no = shost->host_no;
+ ev->r.unbind_session.sid = session->sid;
+ break;
+ default:
+ iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
+ "%u.\n", event);
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ /*
+ * this will occur if the daemon is not up, so we just warn
+ * the user and when the daemon is restarted it will handle it
+ */
+ rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
+ if (rc == -ESRCH)
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "Cannot notify userspace of session "
+ "event %u. Check iscsi daemon\n",
+ event);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
+ event, rc);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(iscsi_session_event);
+
+static int
+iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
+ struct iscsi_uevent *ev, uint32_t initial_cmdsn,
+ uint16_t cmds_max, uint16_t queue_depth)
+{
+ struct iscsi_transport *transport = priv->iscsi_transport;
+ struct iscsi_cls_session *session;
+ struct Scsi_Host *shost;
+
+ session = transport->create_session(ep, cmds_max, queue_depth,
+ initial_cmdsn);
+ if (!session)
+ return -ENOMEM;
+
+ shost = iscsi_session_to_shost(session);
+ ev->r.c_session_ret.host_no = shost->host_no;
+ ev->r.c_session_ret.sid = session->sid;
+ ISCSI_DBG_TRANS_SESSION(session,
+ "Completed creating transport session\n");
+ return 0;
+}
+
+static int
+iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct iscsi_cls_conn *conn;
+ struct iscsi_cls_session *session;
+
+ session = iscsi_session_lookup(ev->u.c_conn.sid);
+ if (!session) {
+ printk(KERN_ERR "iscsi: invalid session %d.\n",
+ ev->u.c_conn.sid);
+ return -EINVAL;
+ }
+
+ conn = transport->create_conn(session, ev->u.c_conn.cid);
+ if (!conn) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "couldn't create a new connection.");
+ return -ENOMEM;
+ }
+
+ ev->r.c_conn_ret.sid = session->sid;
+ ev->r.c_conn_ret.cid = conn->cid;
+
+ ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
+ return 0;
+}
+
+static int
+iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct iscsi_cls_conn *conn;
+
+ conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
+ if (!conn)
+ return -EINVAL;
+
+ ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
+ if (transport->destroy_conn)
+ transport->destroy_conn(conn);
+
+ return 0;
+}
+
+static int
+iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ char *data = (char*)ev + sizeof(*ev);
+ struct iscsi_cls_conn *conn;
+ struct iscsi_cls_session *session;
+ int err = 0, value = 0;
+
+ session = iscsi_session_lookup(ev->u.set_param.sid);
+ conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
+ if (!conn || !session)
+ return -EINVAL;
+
+ switch (ev->u.set_param.param) {
+ case ISCSI_PARAM_SESS_RECOVERY_TMO:
+ sscanf(data, "%d", &value);
+ if (value != 0)
+ session->recovery_tmo = value;
+ break;
+ default:
+ err = transport->set_param(conn, ev->u.set_param.param,
+ data, ev->u.set_param.len);
+ }
+
+ return err;
+}
+
+static int iscsi_if_ep_connect(struct iscsi_transport *transport,
+ struct iscsi_uevent *ev, int msg_type)
+{
+ struct iscsi_endpoint *ep;
+ struct sockaddr *dst_addr;
+ struct Scsi_Host *shost = NULL;
+ int non_blocking, err = 0;
+
+ if (!transport->ep_connect)
+ return -EINVAL;
+
+ if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
+ shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
+ if (!shost) {
+ printk(KERN_ERR "ep connect failed. Could not find "
+ "host no %u\n",
+ ev->u.ep_connect_through_host.host_no);
+ return -ENODEV;
+ }
+ non_blocking = ev->u.ep_connect_through_host.non_blocking;
+ } else
+ non_blocking = ev->u.ep_connect.non_blocking;
+
+ dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
+ ep = transport->ep_connect(shost, dst_addr, non_blocking);
+ if (IS_ERR(ep)) {
+ err = PTR_ERR(ep);
+ goto release_host;
+ }
+
+ ev->r.ep_connect_ret.handle = ep->id;
+release_host:
+ if (shost)
+ scsi_host_put(shost);
+ return err;
+}
+
+static int
+iscsi_if_transport_ep(struct iscsi_transport *transport,
+ struct iscsi_uevent *ev, int msg_type)
+{
+ struct iscsi_endpoint *ep;
+ int rc = 0;
+
+ switch (msg_type) {
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
+ rc = iscsi_if_ep_connect(transport, ev, msg_type);
+ break;
+ case ISCSI_UEVENT_TRANSPORT_EP_POLL:
+ if (!transport->ep_poll)
+ return -EINVAL;
+
+ ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
+ if (!ep)
+ return -EINVAL;
+
+ ev->r.retcode = transport->ep_poll(ep,
+ ev->u.ep_poll.timeout_ms);
+ break;
+ case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+ if (!transport->ep_disconnect)
+ return -EINVAL;
+
+ ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
+ if (!ep)
+ return -EINVAL;
+
+ transport->ep_disconnect(ep);
+ break;
+ }
+ return rc;
+}
+
+static int
+iscsi_tgt_dscvr(struct iscsi_transport *transport,
+ struct iscsi_uevent *ev)
+{
+ struct Scsi_Host *shost;
+ struct sockaddr *dst_addr;
+ int err;
+
+ if (!transport->tgt_dscvr)
+ return -EINVAL;
+
+ shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
+ if (!shost) {
+ printk(KERN_ERR "target discovery could not find host no %u\n",
+ ev->u.tgt_dscvr.host_no);
+ return -ENODEV;
+ }
+
+
+ dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
+ err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
+ ev->u.tgt_dscvr.enable, dst_addr);
+ scsi_host_put(shost);
+ return err;
+}
+
+static int
+iscsi_set_host_param(struct iscsi_transport *transport,
+ struct iscsi_uevent *ev)
+{
+ char *data = (char*)ev + sizeof(*ev);
+ struct Scsi_Host *shost;
+ int err;
+
+ if (!transport->set_host_param)
+ return -ENOSYS;
+
+ shost = scsi_host_lookup(ev->u.set_host_param.host_no);
+ if (!shost) {
+ printk(KERN_ERR "set_host_param could not find host no %u\n",
+ ev->u.set_host_param.host_no);
+ return -ENODEV;
+ }
+
+ err = transport->set_host_param(shost, ev->u.set_host_param.param,
+ data, ev->u.set_host_param.len);
+ scsi_host_put(shost);
+ return err;
+}
+
+static int
+iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct Scsi_Host *shost;
+ struct iscsi_path *params;
+ int err;
+
+ if (!transport->set_path)
+ return -ENOSYS;
+
+ shost = scsi_host_lookup(ev->u.set_path.host_no);
+ if (!shost) {
+ printk(KERN_ERR "set path could not find host no %u\n",
+ ev->u.set_path.host_no);
+ return -ENODEV;
+ }
+
+ params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
+ err = transport->set_path(shost, params);
+
+ scsi_host_put(shost);
+ return err;
+}
+
+static int
+iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
+{
+ int err = 0;
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+ struct iscsi_transport *transport = NULL;
+ struct iscsi_internal *priv;
+ struct iscsi_cls_session *session;
+ struct iscsi_cls_conn *conn;
+ struct iscsi_endpoint *ep = NULL;
+
+ if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
+ *group = ISCSI_NL_GRP_UIP;
+ else
+ *group = ISCSI_NL_GRP_ISCSID;
+
+ priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
+ if (!priv)
+ return -EINVAL;
+ transport = priv->iscsi_transport;
+
+ if (!try_module_get(transport->owner))
+ return -EINVAL;
+
+ switch (nlh->nlmsg_type) {
+ case ISCSI_UEVENT_CREATE_SESSION:
+ err = iscsi_if_create_session(priv, ep, ev,
+ ev->u.c_session.initial_cmdsn,
+ ev->u.c_session.cmds_max,
+ ev->u.c_session.queue_depth);
+ break;
+ case ISCSI_UEVENT_CREATE_BOUND_SESSION:
+ ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
+ if (!ep) {
+ err = -EINVAL;
+ break;
+ }
+
+ err = iscsi_if_create_session(priv, ep, ev,
+ ev->u.c_bound_session.initial_cmdsn,
+ ev->u.c_bound_session.cmds_max,
+ ev->u.c_bound_session.queue_depth);
+ break;
+ case ISCSI_UEVENT_DESTROY_SESSION:
+ session = iscsi_session_lookup(ev->u.d_session.sid);
+ if (session)
+ transport->destroy_session(session);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_UNBIND_SESSION:
+ session = iscsi_session_lookup(ev->u.d_session.sid);
+ if (session)
+ scsi_queue_work(iscsi_session_to_shost(session),
+ &session->unbind_work);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_CREATE_CONN:
+ err = iscsi_if_create_conn(transport, ev);
+ break;
+ case ISCSI_UEVENT_DESTROY_CONN:
+ err = iscsi_if_destroy_conn(transport, ev);
+ break;
+ case ISCSI_UEVENT_BIND_CONN:
+ session = iscsi_session_lookup(ev->u.b_conn.sid);
+ conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
+
+ if (session && conn)
+ ev->r.retcode = transport->bind_conn(session, conn,
+ ev->u.b_conn.transport_eph,
+ ev->u.b_conn.is_leading);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_SET_PARAM:
+ err = iscsi_set_param(transport, ev);
+ break;
+ case ISCSI_UEVENT_START_CONN:
+ conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
+ if (conn)
+ ev->r.retcode = transport->start_conn(conn);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_STOP_CONN:
+ conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
+ if (conn)
+ transport->stop_conn(conn, ev->u.stop_conn.flag);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_SEND_PDU:
+ conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
+ if (conn)
+ ev->r.retcode = transport->send_pdu(conn,
+ (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
+ (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
+ ev->u.send_pdu.data_size);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_GET_STATS:
+ err = iscsi_if_get_stats(transport, nlh);
+ break;
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
+ case ISCSI_UEVENT_TRANSPORT_EP_POLL:
+ case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
+ err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
+ break;
+ case ISCSI_UEVENT_TGT_DSCVR:
+ err = iscsi_tgt_dscvr(transport, ev);
+ break;
+ case ISCSI_UEVENT_SET_HOST_PARAM:
+ err = iscsi_set_host_param(transport, ev);
+ break;
+ case ISCSI_UEVENT_PATH_UPDATE:
+ err = iscsi_set_path(transport, ev);
+ break;
+ default:
+ err = -ENOSYS;
+ break;
+ }
+
+ module_put(transport->owner);
+ return err;
+}
+
+/*
+ * Get message from skb. Each message is processed by iscsi_if_recv_msg.
+ * Malformed skbs with wrong lengths or invalid creds are not processed.
+ */
+static void
+iscsi_if_rx(struct sk_buff *skb)
+{
+ mutex_lock(&rx_queue_mutex);
+ while (skb->len >= NLMSG_SPACE(0)) {
+ int err;
+ uint32_t rlen;
+ struct nlmsghdr *nlh;
+ struct iscsi_uevent *ev;
+ uint32_t group;
+
+ nlh = nlmsg_hdr(skb);
+ if (nlh->nlmsg_len < sizeof(*nlh) ||
+ skb->len < nlh->nlmsg_len) {
+ break;
+ }
+
+ ev = NLMSG_DATA(nlh);
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+
+ err = iscsi_if_recv_msg(skb, nlh, &group);
+ if (err) {
+ ev->type = ISCSI_KEVENT_IF_ERROR;
+ ev->iferror = err;
+ }
+ do {
+ /*
+ * special case for GET_STATS:
+ * on success - sending reply and stats from
+ * inside of if_recv_msg(),
+ * on error - fall through.
+ */
+ if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
+ break;
+ err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
+ nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
+ } while (err < 0 && err != -ECONNREFUSED);
+ skb_pull(skb, rlen);
+ }
+ mutex_unlock(&rx_queue_mutex);
+}
+
+#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
+struct device_attribute dev_attr_##_prefix##_##_name = \
+ __ATTR(_name,_mode,_show,_store)
+
+/*
+ * iSCSI connection attrs
+ */
+#define iscsi_conn_attr_show(param) \
+static ssize_t \
+show_conn_param_##param(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
+ struct iscsi_transport *t = conn->transport; \
+ return t->get_conn_param(conn, param, buf); \
+}
+
+#define iscsi_conn_attr(field, param) \
+ iscsi_conn_attr_show(param) \
+static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
+ NULL);
+
+iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
+iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
+iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
+iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
+iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
+iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
+iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
+iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
+iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
+iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
+iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
+iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
+iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
+
+/*
+ * iSCSI session attrs
+ */
+#define iscsi_session_attr_show(param, perm) \
+static ssize_t \
+show_session_param_##param(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct iscsi_cls_session *session = \
+ iscsi_dev_to_session(dev->parent); \
+ struct iscsi_transport *t = session->transport; \
+ \
+ if (perm && !capable(CAP_SYS_ADMIN)) \
+ return -EACCES; \
+ return t->get_session_param(session, param, buf); \
+}
+
+#define iscsi_session_attr(field, param, perm) \
+ iscsi_session_attr_show(param, perm) \
+static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
+ NULL);
+
+iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
+iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
+iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
+iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
+iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
+iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
+iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
+iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
+iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
+iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
+iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
+iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
+iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
+iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
+iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
+iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
+iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
+iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
+iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
+
+static ssize_t
+show_priv_session_state(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
+ return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
+}
+static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
+ NULL);
+
+#define iscsi_priv_session_attr_show(field, format) \
+static ssize_t \
+show_priv_session_##field(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct iscsi_cls_session *session = \
+ iscsi_dev_to_session(dev->parent); \
+ return sprintf(buf, format"\n", session->field); \
+}
+
+#define iscsi_priv_session_attr(field, format) \
+ iscsi_priv_session_attr_show(field, format) \
+static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
+ NULL)
+iscsi_priv_session_attr(recovery_tmo, "%d");
+
+/*
+ * iSCSI host attrs
+ */
+#define iscsi_host_attr_show(param) \
+static ssize_t \
+show_host_param_##param(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct Scsi_Host *shost = transport_class_to_shost(dev); \
+ struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
+ return priv->iscsi_transport->get_host_param(shost, param, buf); \
+}
+
+#define iscsi_host_attr(field, param) \
+ iscsi_host_attr_show(param) \
+static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
+ NULL);
+
+iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
+iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
+iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
+iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
+
+#define SETUP_PRIV_SESSION_RD_ATTR(field) \
+do { \
+ priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
+ count++; \
+} while (0)
+
+
+#define SETUP_SESSION_RD_ATTR(field, param_flag) \
+do { \
+ if (tt->param_mask & param_flag) { \
+ priv->session_attrs[count] = &dev_attr_sess_##field; \
+ count++; \
+ } \
+} while (0)
+
+#define SETUP_CONN_RD_ATTR(field, param_flag) \
+do { \
+ if (tt->param_mask & param_flag) { \
+ priv->conn_attrs[count] = &dev_attr_conn_##field; \
+ count++; \
+ } \
+} while (0)
+
+#define SETUP_HOST_RD_ATTR(field, param_flag) \
+do { \
+ if (tt->host_param_mask & param_flag) { \
+ priv->host_attrs[count] = &dev_attr_host_##field; \
+ count++; \
+ } \
+} while (0)
+
+static int iscsi_session_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct iscsi_cls_session *session;
+ struct Scsi_Host *shost;
+ struct iscsi_internal *priv;
+
+ if (!iscsi_is_session_dev(dev))
+ return 0;
+
+ session = iscsi_dev_to_session(dev);
+ shost = iscsi_session_to_shost(session);
+ if (!shost->transportt)
+ return 0;
+
+ priv = to_iscsi_internal(shost->transportt);
+ if (priv->session_cont.ac.class != &iscsi_session_class.class)
+ return 0;
+
+ return &priv->session_cont.ac == cont;
+}
+
+static int iscsi_conn_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct iscsi_cls_session *session;
+ struct iscsi_cls_conn *conn;
+ struct Scsi_Host *shost;
+ struct iscsi_internal *priv;
+
+ if (!iscsi_is_conn_dev(dev))
+ return 0;
+
+ conn = iscsi_dev_to_conn(dev);
+ session = iscsi_dev_to_session(conn->dev.parent);
+ shost = iscsi_session_to_shost(session);
+
+ if (!shost->transportt)
+ return 0;
+
+ priv = to_iscsi_internal(shost->transportt);
+ if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
+ return 0;
+
+ return &priv->conn_cont.ac == cont;
+}
+
+static int iscsi_host_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct Scsi_Host *shost;
+ struct iscsi_internal *priv;
+
+ if (!scsi_is_host_device(dev))
+ return 0;
+
+ shost = dev_to_shost(dev);
+ if (!shost->transportt ||
+ shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
+ return 0;
+
+ priv = to_iscsi_internal(shost->transportt);
+ return &priv->t.host_attrs.ac == cont;
+}
+
+struct scsi_transport_template *
+iscsi_register_transport(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;
+ int count = 0, err;
+
+ BUG_ON(!tt);
+
+ priv = iscsi_if_transport_lookup(tt);
+ if (priv)
+ return NULL;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return NULL;
+ INIT_LIST_HEAD(&priv->list);
+ priv->iscsi_transport = tt;
+ priv->t.user_scan = iscsi_user_scan;
+ priv->t.create_work_queue = 1;
+
+ priv->dev.class = &iscsi_transport_class;
+ dev_set_name(&priv->dev, "%s", tt->name);
+ err = device_register(&priv->dev);
+ if (err)
+ goto free_priv;
+
+ err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
+ if (err)
+ goto unregister_dev;
+
+ /* host parameters */
+ priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
+ priv->t.host_attrs.ac.class = &iscsi_host_class.class;
+ priv->t.host_attrs.ac.match = iscsi_host_match;
+ priv->t.host_size = sizeof(struct iscsi_cls_host);
+ transport_container_register(&priv->t.host_attrs);
+
+ SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
+ SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
+ SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
+ SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
+ BUG_ON(count > ISCSI_HOST_ATTRS);
+ priv->host_attrs[count] = NULL;
+ count = 0;
+
+ /* connection parameters */
+ priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
+ priv->conn_cont.ac.class = &iscsi_connection_class.class;
+ priv->conn_cont.ac.match = iscsi_conn_match;
+ transport_container_register(&priv->conn_cont);
+
+ SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
+ SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
+ SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
+ SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
+ SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
+ SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
+ SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
+ SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
+ SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
+ SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
+ SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
+ SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
+ SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
+
+ BUG_ON(count > ISCSI_CONN_ATTRS);
+ priv->conn_attrs[count] = NULL;
+ count = 0;
+
+ /* session parameters */
+ priv->session_cont.ac.attrs = &priv->session_attrs[0];
+ priv->session_cont.ac.class = &iscsi_session_class.class;
+ priv->session_cont.ac.match = iscsi_session_match;
+ transport_container_register(&priv->session_cont);
+
+ SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
+ SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
+ SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
+ SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
+ SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
+ SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
+ SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
+ SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
+ SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
+ SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
+ SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
+ SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
+ SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
+ SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
+ SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
+ SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
+ SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
+ SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
+ SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
+ SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
+ SETUP_PRIV_SESSION_RD_ATTR(state);
+
+ BUG_ON(count > ISCSI_SESSION_ATTRS);
+ priv->session_attrs[count] = NULL;
+
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_add(&priv->list, &iscsi_transports);
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+
+ printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
+ return &priv->t;
+
+unregister_dev:
+ device_unregister(&priv->dev);
+ return NULL;
+free_priv:
+ kfree(priv);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(iscsi_register_transport);
+
+int iscsi_unregister_transport(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;
+
+ BUG_ON(!tt);
+
+ mutex_lock(&rx_queue_mutex);
+
+ priv = iscsi_if_transport_lookup(tt);
+ BUG_ON (!priv);
+
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_del(&priv->list);
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+
+ transport_container_unregister(&priv->conn_cont);
+ transport_container_unregister(&priv->session_cont);
+ transport_container_unregister(&priv->t.host_attrs);
+
+ sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
+ device_unregister(&priv->dev);
+ mutex_unlock(&rx_queue_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
+
+static __init int iscsi_transport_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
+ ISCSI_TRANSPORT_VERSION);
+
+ atomic_set(&iscsi_session_nr, 0);
+
+ err = class_register(&iscsi_transport_class);
+ if (err)
+ return err;
+
+ err = class_register(&iscsi_endpoint_class);
+ if (err)
+ goto unregister_transport_class;
+
+ err = transport_class_register(&iscsi_host_class);
+ if (err)
+ goto unregister_endpoint_class;
+
+ err = transport_class_register(&iscsi_connection_class);
+ if (err)
+ goto unregister_host_class;
+
+ err = transport_class_register(&iscsi_session_class);
+ if (err)
+ goto unregister_conn_class;
+
+ nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
+ NULL, THIS_MODULE);
+ if (!nls) {
+ err = -ENOBUFS;
+ goto unregister_session_class;
+ }
+
+ iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
+ if (!iscsi_eh_timer_workq)
+ goto release_nls;
+
+ return 0;
+
+release_nls:
+ netlink_kernel_release(nls);
+unregister_session_class:
+ transport_class_unregister(&iscsi_session_class);
+unregister_conn_class:
+ transport_class_unregister(&iscsi_connection_class);
+unregister_host_class:
+ transport_class_unregister(&iscsi_host_class);
+unregister_endpoint_class:
+ class_unregister(&iscsi_endpoint_class);
+unregister_transport_class:
+ class_unregister(&iscsi_transport_class);
+ return err;
}
static void __exit iscsi_transport_exit(void)
{
+ destroy_workqueue(iscsi_eh_timer_workq);
+ netlink_kernel_release(nls);
+ transport_class_unregister(&iscsi_connection_class);
+ transport_class_unregister(&iscsi_session_class);
transport_class_unregister(&iscsi_host_class);
- transport_class_unregister(&iscsi_transport_class);
+ class_unregister(&iscsi_endpoint_class);
+ class_unregister(&iscsi_transport_class);
}
module_init(iscsi_transport_init);
module_exit(iscsi_transport_exit);
-MODULE_AUTHOR("Mike Christie");
-MODULE_DESCRIPTION("iSCSI Transport Attributes");
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
+ "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
+ "Alex Aizman <itn780@yahoo.com>");
+MODULE_DESCRIPTION("iSCSI Transport Interface");
MODULE_LICENSE("GPL");
+MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff