2 * iSCSI transport class definitions
4 * Copyright (C) IBM Corporation, 2004
5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <linux/module.h>
24 #include <linux/mempool.h>
25 #include <linux/mutex.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_iscsi.h>
32 #include <scsi/iscsi_if.h>
34 #define ISCSI_SESSION_ATTRS 11
35 #define ISCSI_CONN_ATTRS 11
36 #define ISCSI_HOST_ATTRS 0
38 struct iscsi_internal {
40 struct scsi_transport_template t;
41 struct iscsi_transport *iscsi_transport;
42 struct list_head list;
43 struct class_device cdev;
45 struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
52 static int iscsi_session_nr; /* sysfs session id for next new session */
55 * list of registered transports and lock that must
56 * be held while accessing list. The iscsi_transport_lock must
57 * be acquired after the rx_queue_mutex.
59 static LIST_HEAD(iscsi_transports);
60 static DEFINE_SPINLOCK(iscsi_transport_lock);
62 #define to_iscsi_internal(tmpl) \
63 container_of(tmpl, struct iscsi_internal, t)
65 #define cdev_to_iscsi_internal(_cdev) \
66 container_of(_cdev, struct iscsi_internal, cdev)
68 static void iscsi_transport_release(struct class_device *cdev)
70 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
75 * iscsi_transport_class represents the iscsi_transports that are
78 static struct class iscsi_transport_class = {
79 .name = "iscsi_transport",
80 .release = iscsi_transport_release,
84 show_transport_handle(struct class_device *cdev, char *buf)
86 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
87 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
89 static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
91 #define show_transport_attr(name, format) \
93 show_transport_##name(struct class_device *cdev, char *buf) \
95 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
96 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
98 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
100 show_transport_attr(caps, "0x%x");
101 show_transport_attr(max_lun, "%d");
102 show_transport_attr(max_conn, "%d");
103 show_transport_attr(max_cmd_len, "%d");
105 static struct attribute *iscsi_transport_attrs[] = {
106 &class_device_attr_handle.attr,
107 &class_device_attr_caps.attr,
108 &class_device_attr_max_lun.attr,
109 &class_device_attr_max_conn.attr,
110 &class_device_attr_max_cmd_len.attr,
114 static struct attribute_group iscsi_transport_group = {
115 .attrs = iscsi_transport_attrs,
118 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
119 struct class_device *cdev)
121 struct Scsi_Host *shost = dev_to_shost(dev);
122 struct iscsi_host *ihost = shost->shost_data;
124 memset(ihost, 0, sizeof(*ihost));
125 INIT_LIST_HEAD(&ihost->sessions);
126 mutex_init(&ihost->mutex);
130 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
136 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
142 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
148 static struct sock *nls;
149 static DEFINE_MUTEX(rx_queue_mutex);
151 struct mempool_zone {
156 struct list_head freequeue;
160 static struct mempool_zone *z_reply;
163 * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
164 * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
165 * so daemon will notice OOM on NETLINK tranposrt level and will
166 * be able to predict or change operational behavior
168 #define Z_MAX_REPLY 8
169 #define Z_HIWAT_REPLY 6
171 #define Z_HIWAT_PDU 6
172 #define Z_MAX_ERROR 16
173 #define Z_HIWAT_ERROR 12
175 static LIST_HEAD(sesslist);
176 static DEFINE_SPINLOCK(sesslock);
177 static LIST_HEAD(connlist);
178 static DEFINE_SPINLOCK(connlock);
180 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
182 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
187 * Returns the matching session to a given sid
189 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
192 struct iscsi_cls_session *sess;
194 spin_lock_irqsave(&sesslock, flags);
195 list_for_each_entry(sess, &sesslist, sess_list) {
196 if (sess->sid == sid) {
197 spin_unlock_irqrestore(&sesslock, flags);
201 spin_unlock_irqrestore(&sesslock, flags);
206 * Returns the matching connection to a given sid / cid tuple
208 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
211 struct iscsi_cls_conn *conn;
213 spin_lock_irqsave(&connlock, flags);
214 list_for_each_entry(conn, &connlist, conn_list) {
215 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
216 spin_unlock_irqrestore(&connlock, flags);
220 spin_unlock_irqrestore(&connlock, flags);
225 * The following functions can be used by LLDs that allocate
226 * their own scsi_hosts or by software iscsi LLDs
228 static void iscsi_session_release(struct device *dev)
230 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
231 struct iscsi_transport *transport = session->transport;
232 struct Scsi_Host *shost;
234 shost = iscsi_session_to_shost(session);
235 scsi_host_put(shost);
236 kfree(session->targetname);
238 module_put(transport->owner);
241 static int iscsi_is_session_dev(const struct device *dev)
243 return dev->release == iscsi_session_release;
246 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
249 struct iscsi_host *ihost = shost->shost_data;
250 struct iscsi_cls_session *session;
252 mutex_lock(&ihost->mutex);
253 list_for_each_entry(session, &ihost->sessions, host_list) {
254 if ((channel == SCAN_WILD_CARD ||
255 channel == session->channel) &&
256 (id == SCAN_WILD_CARD || id == session->target_id))
257 scsi_scan_target(&session->dev, session->channel,
258 session->target_id, lun, 1);
260 mutex_unlock(&ihost->mutex);
265 static void session_recovery_timedout(void *data)
267 struct iscsi_cls_session *session = data;
269 dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed "
270 "out after %d secs\n", session->recovery_tmo);
272 if (session->transport->session_recovery_timedout)
273 session->transport->session_recovery_timedout(session);
275 scsi_target_unblock(&session->dev);
278 void iscsi_unblock_session(struct iscsi_cls_session *session)
280 if (!cancel_delayed_work(&session->recovery_work))
281 flush_scheduled_work();
282 scsi_target_unblock(&session->dev);
284 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
286 void iscsi_block_session(struct iscsi_cls_session *session)
288 scsi_target_block(&session->dev);
289 schedule_delayed_work(&session->recovery_work,
290 session->recovery_tmo * HZ);
292 EXPORT_SYMBOL_GPL(iscsi_block_session);
295 * iscsi_create_session - create iscsi class session
297 * @transport: iscsi transport
299 * This can be called from a LLD or iscsi_transport.
301 struct iscsi_cls_session *
302 iscsi_create_session(struct Scsi_Host *shost,
303 struct iscsi_transport *transport, int channel)
305 struct iscsi_host *ihost;
306 struct iscsi_cls_session *session;
309 if (!try_module_get(transport->owner))
312 session = kzalloc(sizeof(*session) + transport->sessiondata_size,
316 session->transport = transport;
317 session->recovery_tmo = 120;
318 INIT_WORK(&session->recovery_work, session_recovery_timedout, session);
319 INIT_LIST_HEAD(&session->host_list);
320 INIT_LIST_HEAD(&session->sess_list);
322 if (transport->sessiondata_size)
323 session->dd_data = &session[1];
325 /* this is released in the dev's release function */
326 scsi_host_get(shost);
327 ihost = shost->shost_data;
329 session->sid = iscsi_session_nr++;
330 session->channel = channel;
331 session->target_id = ihost->next_target_id++;
333 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
335 session->dev.parent = &shost->shost_gendev;
336 session->dev.release = iscsi_session_release;
337 err = device_register(&session->dev);
339 dev_printk(KERN_ERR, &session->dev, "iscsi: could not "
340 "register session's dev\n");
343 transport_register_device(&session->dev);
345 mutex_lock(&ihost->mutex);
346 list_add(&session->host_list, &ihost->sessions);
347 mutex_unlock(&ihost->mutex);
354 module_put(transport->owner);
358 EXPORT_SYMBOL_GPL(iscsi_create_session);
361 * iscsi_destroy_session - destroy iscsi session
362 * @session: iscsi_session
364 * Can be called by a LLD or iscsi_transport. There must not be
365 * any running connections.
367 int iscsi_destroy_session(struct iscsi_cls_session *session)
369 struct Scsi_Host *shost = iscsi_session_to_shost(session);
370 struct iscsi_host *ihost = shost->shost_data;
372 if (!cancel_delayed_work(&session->recovery_work))
373 flush_scheduled_work();
375 mutex_lock(&ihost->mutex);
376 list_del(&session->host_list);
377 mutex_unlock(&ihost->mutex);
379 transport_unregister_device(&session->dev);
380 device_unregister(&session->dev);
384 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
386 static void iscsi_conn_release(struct device *dev)
388 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
389 struct device *parent = conn->dev.parent;
391 kfree(conn->persistent_address);
396 static int iscsi_is_conn_dev(const struct device *dev)
398 return dev->release == iscsi_conn_release;
402 * iscsi_create_conn - create iscsi class connection
403 * @session: iscsi cls session
404 * @cid: connection id
406 * This can be called from a LLD or iscsi_transport. The connection
407 * is child of the session so cid must be unique for all connections
410 * Since we do not support MCS, cid will normally be zero. In some cases
411 * for software iscsi we could be trying to preallocate a connection struct
412 * in which case there could be two connection structs and cid would be
415 struct iscsi_cls_conn *
416 iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
418 struct iscsi_transport *transport = session->transport;
419 struct iscsi_cls_conn *conn;
422 conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
426 if (transport->conndata_size)
427 conn->dd_data = &conn[1];
429 INIT_LIST_HEAD(&conn->conn_list);
430 conn->transport = transport;
433 /* this is released in the dev's release function */
434 if (!get_device(&session->dev))
437 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
439 conn->dev.parent = &session->dev;
440 conn->dev.release = iscsi_conn_release;
441 err = device_register(&conn->dev);
443 dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register "
444 "connection's dev\n");
445 goto release_parent_ref;
447 transport_register_device(&conn->dev);
451 put_device(&session->dev);
457 EXPORT_SYMBOL_GPL(iscsi_create_conn);
460 * iscsi_destroy_conn - destroy iscsi class connection
461 * @session: iscsi cls session
463 * This can be called from a LLD or iscsi_transport.
465 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
467 transport_unregister_device(&conn->dev);
468 device_unregister(&conn->dev);
472 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
475 * iscsi interface functions
477 static struct iscsi_internal *
478 iscsi_if_transport_lookup(struct iscsi_transport *tt)
480 struct iscsi_internal *priv;
483 spin_lock_irqsave(&iscsi_transport_lock, flags);
484 list_for_each_entry(priv, &iscsi_transports, list) {
485 if (tt == priv->iscsi_transport) {
486 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
490 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
494 static inline struct list_head *skb_to_lh(struct sk_buff *skb)
496 return (struct list_head *)&skb->cb;
500 mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data)
502 struct mempool_zone *zone = pool_data;
504 return alloc_skb(zone->size, gfp_mask);
508 mempool_zone_free_skb(void *element, void *pool_data)
514 mempool_zone_complete(struct mempool_zone *zone)
517 struct list_head *lh, *n;
519 spin_lock_irqsave(&zone->freelock, flags);
520 list_for_each_safe(lh, n, &zone->freequeue) {
521 struct sk_buff *skb = (struct sk_buff *)((char *)lh -
522 offsetof(struct sk_buff, cb));
523 if (!skb_shared(skb)) {
524 list_del(skb_to_lh(skb));
525 mempool_free(skb, zone->pool);
526 atomic_dec(&zone->allocated);
529 spin_unlock_irqrestore(&zone->freelock, flags);
532 static struct mempool_zone *
533 mempool_zone_init(unsigned max, unsigned size, unsigned hiwat)
535 struct mempool_zone *zp;
537 zp = kzalloc(sizeof(*zp), GFP_KERNEL);
543 INIT_LIST_HEAD(&zp->freequeue);
544 spin_lock_init(&zp->freelock);
545 atomic_set(&zp->allocated, 0);
547 zp->pool = mempool_create(max, mempool_zone_alloc_skb,
548 mempool_zone_free_skb, zp);
557 static void mempool_zone_destroy(struct mempool_zone *zp)
559 mempool_destroy(zp->pool);
563 static struct sk_buff*
564 mempool_zone_get_skb(struct mempool_zone *zone)
568 skb = mempool_alloc(zone->pool, GFP_ATOMIC);
570 atomic_inc(&zone->allocated);
575 iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid)
581 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
583 mempool_free(skb, zone->pool);
584 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
588 spin_lock_irqsave(&zone->freelock, flags);
589 INIT_LIST_HEAD(skb_to_lh(skb));
590 list_add(skb_to_lh(skb), &zone->freequeue);
591 spin_unlock_irqrestore(&zone->freelock, flags);
596 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
597 char *data, uint32_t data_size)
599 struct nlmsghdr *nlh;
601 struct iscsi_uevent *ev;
603 struct iscsi_internal *priv;
604 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
607 priv = iscsi_if_transport_lookup(conn->transport);
611 mempool_zone_complete(conn->z_pdu);
613 skb = mempool_zone_get_skb(conn->z_pdu);
615 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
616 dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver "
617 "control PDU: OOM\n");
621 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
622 ev = NLMSG_DATA(nlh);
623 memset(ev, 0, sizeof(*ev));
624 ev->transport_handle = iscsi_handle(conn->transport);
625 ev->type = ISCSI_KEVENT_RECV_PDU;
626 if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
627 ev->iferror = -ENOMEM;
628 ev->r.recv_req.cid = conn->cid;
629 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
630 pdu = (char*)ev + sizeof(*ev);
631 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
632 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
634 return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid);
636 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
638 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
640 struct nlmsghdr *nlh;
642 struct iscsi_uevent *ev;
643 struct iscsi_internal *priv;
644 int len = NLMSG_SPACE(sizeof(*ev));
646 priv = iscsi_if_transport_lookup(conn->transport);
650 mempool_zone_complete(conn->z_error);
652 skb = mempool_zone_get_skb(conn->z_error);
654 dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored "
655 "conn error (%d)\n", error);
659 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
660 ev = NLMSG_DATA(nlh);
661 ev->transport_handle = iscsi_handle(conn->transport);
662 ev->type = ISCSI_KEVENT_CONN_ERROR;
663 if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat)
664 ev->iferror = -ENOMEM;
665 ev->r.connerror.error = error;
666 ev->r.connerror.cid = conn->cid;
667 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
669 iscsi_unicast_skb(conn->z_error, skb, priv->daemon_pid);
671 dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n",
674 EXPORT_SYMBOL_GPL(iscsi_conn_error);
677 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
678 void *payload, int size)
681 struct nlmsghdr *nlh;
682 int len = NLMSG_SPACE(size);
683 int flags = multi ? NLM_F_MULTI : 0;
684 int t = done ? NLMSG_DONE : type;
686 mempool_zone_complete(z_reply);
688 skb = mempool_zone_get_skb(z_reply);
691 * user is supposed to react on iferror == -ENOMEM;
696 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
697 nlh->nlmsg_flags = flags;
698 memcpy(NLMSG_DATA(nlh), payload, size);
699 return iscsi_unicast_skb(z_reply, skb, pid);
703 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
705 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
706 struct iscsi_stats *stats;
707 struct sk_buff *skbstat;
708 struct iscsi_cls_conn *conn;
709 struct nlmsghdr *nlhstat;
710 struct iscsi_uevent *evstat;
711 struct iscsi_internal *priv;
712 int len = NLMSG_SPACE(sizeof(*ev) +
713 sizeof(struct iscsi_stats) +
714 sizeof(struct iscsi_stats_custom) *
715 ISCSI_STATS_CUSTOM_MAX);
718 priv = iscsi_if_transport_lookup(transport);
722 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
729 mempool_zone_complete(conn->z_pdu);
731 skbstat = mempool_zone_get_skb(conn->z_pdu);
733 dev_printk(KERN_ERR, &conn->dev, "iscsi: can not "
734 "deliver stats: OOM\n");
738 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
739 (len - sizeof(*nlhstat)), 0);
740 evstat = NLMSG_DATA(nlhstat);
741 memset(evstat, 0, sizeof(*evstat));
742 evstat->transport_handle = iscsi_handle(conn->transport);
743 evstat->type = nlh->nlmsg_type;
744 if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
745 evstat->iferror = -ENOMEM;
746 evstat->u.get_stats.cid =
748 evstat->u.get_stats.sid =
750 stats = (struct iscsi_stats *)
751 ((char*)evstat + sizeof(*evstat));
752 memset(stats, 0, sizeof(*stats));
754 transport->get_stats(conn, stats);
755 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
756 sizeof(struct iscsi_stats) +
757 sizeof(struct iscsi_stats_custom) *
758 stats->custom_length);
759 actual_size -= sizeof(*nlhstat);
760 actual_size = NLMSG_LENGTH(actual_size);
761 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
762 nlhstat->nlmsg_len = actual_size;
764 err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid);
765 } while (err < 0 && err != -ECONNREFUSED);
771 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
773 struct iscsi_transport *transport = priv->iscsi_transport;
774 struct iscsi_cls_session *session;
778 session = transport->create_session(transport, &priv->t,
779 ev->u.c_session.initial_cmdsn,
784 spin_lock_irqsave(&sesslock, flags);
785 list_add(&session->sess_list, &sesslist);
786 spin_unlock_irqrestore(&sesslock, flags);
788 ev->r.c_session_ret.host_no = hostno;
789 ev->r.c_session_ret.sid = session->sid;
794 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
796 struct iscsi_cls_conn *conn;
797 struct iscsi_cls_session *session;
800 session = iscsi_session_lookup(ev->u.c_conn.sid);
802 printk(KERN_ERR "iscsi: invalid session %d\n",
807 conn = transport->create_conn(session, ev->u.c_conn.cid);
809 printk(KERN_ERR "iscsi: couldn't create a new "
810 "connection for session %d\n",
815 conn->z_pdu = mempool_zone_init(Z_MAX_PDU,
816 NLMSG_SPACE(sizeof(struct iscsi_uevent) +
817 sizeof(struct iscsi_hdr) +
818 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
821 dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
822 "pdu zone for new conn\n");
826 conn->z_error = mempool_zone_init(Z_MAX_ERROR,
827 NLMSG_SPACE(sizeof(struct iscsi_uevent)),
829 if (!conn->z_error) {
830 dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
831 "error zone for new conn\n");
835 ev->r.c_conn_ret.sid = session->sid;
836 ev->r.c_conn_ret.cid = conn->cid;
838 spin_lock_irqsave(&connlock, flags);
839 list_add(&conn->conn_list, &connlist);
841 spin_unlock_irqrestore(&connlock, flags);
846 mempool_zone_destroy(conn->z_pdu);
848 if (transport->destroy_conn)
849 transport->destroy_conn(conn->dd_data);
854 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
857 struct iscsi_cls_conn *conn;
858 struct mempool_zone *z_error, *z_pdu;
860 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
863 spin_lock_irqsave(&connlock, flags);
865 list_del(&conn->conn_list);
866 spin_unlock_irqrestore(&connlock, flags);
869 z_error = conn->z_error;
871 if (transport->destroy_conn)
872 transport->destroy_conn(conn);
874 mempool_zone_destroy(z_pdu);
875 mempool_zone_destroy(z_error);
881 iscsi_copy_param(struct iscsi_uevent *ev, uint32_t *value, char *data)
883 if (ev->u.set_param.len != sizeof(uint32_t))
885 memcpy(value, data, min_t(uint32_t, sizeof(uint32_t),
886 ev->u.set_param.len));
890 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
892 char *data = (char*)ev + sizeof(*ev);
893 struct iscsi_cls_conn *conn;
894 struct iscsi_cls_session *session;
898 session = iscsi_session_lookup(ev->u.set_param.sid);
899 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
900 if (!conn || !session)
903 switch (ev->u.set_param.param) {
904 case ISCSI_PARAM_SESS_RECOVERY_TMO:
905 iscsi_copy_param(ev, &value, data);
907 session->recovery_tmo = value;
909 case ISCSI_PARAM_TARGET_NAME:
910 /* this should not change between logins */
911 if (session->targetname)
914 session->targetname = kstrdup(data, GFP_KERNEL);
915 if (!session->targetname)
918 case ISCSI_PARAM_TPGT:
919 iscsi_copy_param(ev, &value, data);
920 session->tpgt = value;
922 case ISCSI_PARAM_PERSISTENT_PORT:
923 iscsi_copy_param(ev, &value, data);
924 conn->persistent_port = value;
926 case ISCSI_PARAM_PERSISTENT_ADDRESS:
928 * this is the address returned in discovery so it should
929 * not change between logins.
931 if (conn->persistent_address)
934 conn->persistent_address = kstrdup(data, GFP_KERNEL);
935 if (!conn->persistent_address)
939 iscsi_copy_param(ev, &value, data);
940 err = transport->set_param(conn, ev->u.set_param.param, value);
947 iscsi_if_transport_ep(struct iscsi_transport *transport,
948 struct iscsi_uevent *ev, int msg_type)
950 struct sockaddr *dst_addr;
954 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
955 if (!transport->ep_connect)
958 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
959 rc = transport->ep_connect(dst_addr,
960 ev->u.ep_connect.non_blocking,
961 &ev->r.ep_connect_ret.handle);
963 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
964 if (!transport->ep_poll)
967 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
968 ev->u.ep_poll.timeout_ms);
970 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
971 if (!transport->ep_disconnect)
974 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
981 iscsi_tgt_dscvr(struct iscsi_transport *transport,
982 struct iscsi_uevent *ev)
984 struct sockaddr *dst_addr;
986 if (!transport->tgt_dscvr)
989 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
990 return transport->tgt_dscvr(ev->u.tgt_dscvr.type,
991 ev->u.tgt_dscvr.host_no,
992 ev->u.tgt_dscvr.enable, dst_addr);
996 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
999 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1000 struct iscsi_transport *transport = NULL;
1001 struct iscsi_internal *priv;
1002 struct iscsi_cls_session *session;
1003 struct iscsi_cls_conn *conn;
1004 unsigned long flags;
1006 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1009 transport = priv->iscsi_transport;
1011 if (!try_module_get(transport->owner))
1014 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1016 switch (nlh->nlmsg_type) {
1017 case ISCSI_UEVENT_CREATE_SESSION:
1018 err = iscsi_if_create_session(priv, ev);
1020 case ISCSI_UEVENT_DESTROY_SESSION:
1021 session = iscsi_session_lookup(ev->u.d_session.sid);
1023 spin_lock_irqsave(&sesslock, flags);
1024 list_del(&session->sess_list);
1025 spin_unlock_irqrestore(&sesslock, flags);
1027 transport->destroy_session(session);
1031 case ISCSI_UEVENT_CREATE_CONN:
1032 err = iscsi_if_create_conn(transport, ev);
1034 case ISCSI_UEVENT_DESTROY_CONN:
1035 err = iscsi_if_destroy_conn(transport, ev);
1037 case ISCSI_UEVENT_BIND_CONN:
1038 session = iscsi_session_lookup(ev->u.b_conn.sid);
1039 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1041 if (session && conn)
1042 ev->r.retcode = transport->bind_conn(session, conn,
1043 ev->u.b_conn.transport_eph,
1044 ev->u.b_conn.is_leading);
1048 case ISCSI_UEVENT_SET_PARAM:
1049 err = iscsi_set_param(transport, ev);
1051 case ISCSI_UEVENT_START_CONN:
1052 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1054 ev->r.retcode = transport->start_conn(conn);
1058 case ISCSI_UEVENT_STOP_CONN:
1059 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1061 transport->stop_conn(conn, ev->u.stop_conn.flag);
1065 case ISCSI_UEVENT_SEND_PDU:
1066 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1068 ev->r.retcode = transport->send_pdu(conn,
1069 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1070 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1071 ev->u.send_pdu.data_size);
1075 case ISCSI_UEVENT_GET_STATS:
1076 err = iscsi_if_get_stats(transport, nlh);
1078 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1079 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1080 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1081 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1083 case ISCSI_UEVENT_TGT_DSCVR:
1084 err = iscsi_tgt_dscvr(transport, ev);
1091 module_put(transport->owner);
1096 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
1097 * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or
1098 * invalid creds are discarded silently.
1101 iscsi_if_rx(struct sock *sk, int len)
1103 struct sk_buff *skb;
1105 mutex_lock(&rx_queue_mutex);
1106 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
1107 if (NETLINK_CREDS(skb)->uid) {
1108 skb_pull(skb, skb->len);
1112 while (skb->len >= NLMSG_SPACE(0)) {
1115 struct nlmsghdr *nlh;
1116 struct iscsi_uevent *ev;
1118 nlh = (struct nlmsghdr *)skb->data;
1119 if (nlh->nlmsg_len < sizeof(*nlh) ||
1120 skb->len < nlh->nlmsg_len) {
1124 ev = NLMSG_DATA(nlh);
1125 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1126 if (rlen > skb->len)
1129 err = iscsi_if_recv_msg(skb, nlh);
1131 ev->type = ISCSI_KEVENT_IF_ERROR;
1136 * special case for GET_STATS:
1137 * on success - sending reply and stats from
1138 * inside of if_recv_msg(),
1139 * on error - fall through.
1141 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1143 err = iscsi_if_send_reply(
1144 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1145 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1146 if (atomic_read(&z_reply->allocated) >=
1148 ev->iferror = -ENOMEM;
1149 } while (err < 0 && err != -ECONNREFUSED);
1150 skb_pull(skb, rlen);
1155 mutex_unlock(&rx_queue_mutex);
1158 #define iscsi_cdev_to_conn(_cdev) \
1159 iscsi_dev_to_conn(_cdev->dev)
1161 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1162 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1163 __ATTR(_name,_mode,_show,_store)
1166 * iSCSI connection attrs
1168 #define iscsi_conn_int_attr_show(param, format) \
1170 show_conn_int_param_##param(struct class_device *cdev, char *buf) \
1172 uint32_t value = 0; \
1173 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1174 struct iscsi_transport *t = conn->transport; \
1176 t->get_conn_param(conn, param, &value); \
1177 return snprintf(buf, 20, format"\n", value); \
1180 #define iscsi_conn_int_attr(field, param, format) \
1181 iscsi_conn_int_attr_show(param, format) \
1182 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_int_param_##param, \
1185 iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u");
1186 iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u");
1187 iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d");
1188 iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d");
1189 iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d");
1190 iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d");
1191 iscsi_conn_int_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT, "%d");
1192 iscsi_conn_int_attr(port, ISCSI_PARAM_CONN_PORT, "%d");
1193 iscsi_conn_int_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN, "%u");
1195 #define iscsi_conn_str_attr_show(param) \
1197 show_conn_str_param_##param(struct class_device *cdev, char *buf) \
1199 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1200 struct iscsi_transport *t = conn->transport; \
1201 return t->get_conn_str_param(conn, param, buf); \
1204 #define iscsi_conn_str_attr(field, param) \
1205 iscsi_conn_str_attr_show(param) \
1206 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_str_param_##param, \
1209 iscsi_conn_str_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1210 iscsi_conn_str_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1212 #define iscsi_cdev_to_session(_cdev) \
1213 iscsi_dev_to_session(_cdev->dev)
1216 * iSCSI session attrs
1218 #define iscsi_session_int_attr_show(param, format) \
1220 show_session_int_param_##param(struct class_device *cdev, char *buf) \
1222 uint32_t value = 0; \
1223 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1224 struct iscsi_transport *t = session->transport; \
1226 t->get_session_param(session, param, &value); \
1227 return snprintf(buf, 20, format"\n", value); \
1230 #define iscsi_session_int_attr(field, param, format) \
1231 iscsi_session_int_attr_show(param, format) \
1232 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_int_param_##param, \
1235 iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d");
1236 iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu");
1237 iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d");
1238 iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u");
1239 iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u");
1240 iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d");
1241 iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d");
1242 iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d");
1243 iscsi_session_int_attr(tpgt, ISCSI_PARAM_TPGT, "%d");
1245 #define iscsi_session_str_attr_show(param) \
1247 show_session_str_param_##param(struct class_device *cdev, char *buf) \
1249 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1250 struct iscsi_transport *t = session->transport; \
1251 return t->get_session_str_param(session, param, buf); \
1254 #define iscsi_session_str_attr(field, param) \
1255 iscsi_session_str_attr_show(param) \
1256 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_str_param_##param, \
1259 iscsi_session_str_attr(targetname, ISCSI_PARAM_TARGET_NAME);
1262 * Private session and conn attrs. userspace uses several iscsi values
1263 * to identify each session between reboots. Some of these values may not
1264 * be present in the iscsi_transport/LLD driver becuase userspace handles
1265 * login (and failback for login redirect) so for these type of drivers
1266 * the class manages the attrs and values for the iscsi_transport/LLD
1268 #define iscsi_priv_session_attr_show(field, format) \
1270 show_priv_session_##field(struct class_device *cdev, char *buf) \
1272 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1273 return sprintf(buf, format"\n", session->field); \
1276 #define iscsi_priv_session_attr(field, format) \
1277 iscsi_priv_session_attr_show(field, format) \
1278 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1280 iscsi_priv_session_attr(targetname, "%s");
1281 iscsi_priv_session_attr(tpgt, "%d");
1282 iscsi_priv_session_attr(recovery_tmo, "%d");
1284 #define iscsi_priv_conn_attr_show(field, format) \
1286 show_priv_conn_##field(struct class_device *cdev, char *buf) \
1288 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1289 return sprintf(buf, format"\n", conn->field); \
1292 #define iscsi_priv_conn_attr(field, format) \
1293 iscsi_priv_conn_attr_show(field, format) \
1294 static ISCSI_CLASS_ATTR(priv_conn, field, S_IRUGO, show_priv_conn_##field, \
1296 iscsi_priv_conn_attr(persistent_address, "%s");
1297 iscsi_priv_conn_attr(persistent_port, "%d");
1299 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1301 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1305 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1307 if (tt->param_mask & param_flag) { \
1308 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1313 #define SETUP_PRIV_CONN_RD_ATTR(field) \
1315 priv->conn_attrs[count] = &class_device_attr_priv_conn_##field; \
1319 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1321 if (tt->param_mask & param_flag) { \
1322 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1327 static int iscsi_session_match(struct attribute_container *cont,
1330 struct iscsi_cls_session *session;
1331 struct Scsi_Host *shost;
1332 struct iscsi_internal *priv;
1334 if (!iscsi_is_session_dev(dev))
1337 session = iscsi_dev_to_session(dev);
1338 shost = iscsi_session_to_shost(session);
1339 if (!shost->transportt)
1342 priv = to_iscsi_internal(shost->transportt);
1343 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1346 return &priv->session_cont.ac == cont;
1349 static int iscsi_conn_match(struct attribute_container *cont,
1352 struct iscsi_cls_session *session;
1353 struct iscsi_cls_conn *conn;
1354 struct Scsi_Host *shost;
1355 struct iscsi_internal *priv;
1357 if (!iscsi_is_conn_dev(dev))
1360 conn = iscsi_dev_to_conn(dev);
1361 session = iscsi_dev_to_session(conn->dev.parent);
1362 shost = iscsi_session_to_shost(session);
1364 if (!shost->transportt)
1367 priv = to_iscsi_internal(shost->transportt);
1368 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1371 return &priv->conn_cont.ac == cont;
1374 static int iscsi_host_match(struct attribute_container *cont,
1377 struct Scsi_Host *shost;
1378 struct iscsi_internal *priv;
1380 if (!scsi_is_host_device(dev))
1383 shost = dev_to_shost(dev);
1384 if (!shost->transportt ||
1385 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1388 priv = to_iscsi_internal(shost->transportt);
1389 return &priv->t.host_attrs.ac == cont;
1392 struct scsi_transport_template *
1393 iscsi_register_transport(struct iscsi_transport *tt)
1395 struct iscsi_internal *priv;
1396 unsigned long flags;
1401 priv = iscsi_if_transport_lookup(tt);
1405 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1408 INIT_LIST_HEAD(&priv->list);
1409 priv->iscsi_transport = tt;
1410 priv->t.user_scan = iscsi_user_scan;
1412 priv->cdev.class = &iscsi_transport_class;
1413 snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
1414 err = class_device_register(&priv->cdev);
1418 err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
1420 goto unregister_cdev;
1422 /* host parameters */
1423 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1424 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1425 priv->t.host_attrs.ac.match = iscsi_host_match;
1426 priv->t.host_size = sizeof(struct iscsi_host);
1427 priv->host_attrs[0] = NULL;
1428 transport_container_register(&priv->t.host_attrs);
1430 /* connection parameters */
1431 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1432 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1433 priv->conn_cont.ac.match = iscsi_conn_match;
1434 transport_container_register(&priv->conn_cont);
1436 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1437 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1438 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1439 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1440 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1441 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1442 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1443 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1444 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1446 if (tt->param_mask & ISCSI_PERSISTENT_ADDRESS)
1447 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1449 SETUP_PRIV_CONN_RD_ATTR(persistent_address);
1451 if (tt->param_mask & ISCSI_PERSISTENT_PORT)
1452 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1454 SETUP_PRIV_CONN_RD_ATTR(persistent_port);
1456 BUG_ON(count > ISCSI_CONN_ATTRS);
1457 priv->conn_attrs[count] = NULL;
1460 /* session parameters */
1461 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1462 priv->session_cont.ac.class = &iscsi_session_class.class;
1463 priv->session_cont.ac.match = iscsi_session_match;
1464 transport_container_register(&priv->session_cont);
1466 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1467 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1468 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1469 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1470 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1471 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1472 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1473 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1474 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1476 if (tt->param_mask & ISCSI_TARGET_NAME)
1477 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1479 SETUP_PRIV_SESSION_RD_ATTR(targetname);
1481 if (tt->param_mask & ISCSI_TPGT)
1482 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1484 SETUP_PRIV_SESSION_RD_ATTR(tpgt);
1486 BUG_ON(count > ISCSI_SESSION_ATTRS);
1487 priv->session_attrs[count] = NULL;
1489 spin_lock_irqsave(&iscsi_transport_lock, flags);
1490 list_add(&priv->list, &iscsi_transports);
1491 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1493 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1497 class_device_unregister(&priv->cdev);
1502 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1504 int iscsi_unregister_transport(struct iscsi_transport *tt)
1506 struct iscsi_internal *priv;
1507 unsigned long flags;
1511 mutex_lock(&rx_queue_mutex);
1513 priv = iscsi_if_transport_lookup(tt);
1516 spin_lock_irqsave(&iscsi_transport_lock, flags);
1517 list_del(&priv->list);
1518 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1520 transport_container_unregister(&priv->conn_cont);
1521 transport_container_unregister(&priv->session_cont);
1522 transport_container_unregister(&priv->t.host_attrs);
1524 sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
1525 class_device_unregister(&priv->cdev);
1526 mutex_unlock(&rx_queue_mutex);
1530 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1533 iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
1535 struct netlink_notify *n = ptr;
1537 if (event == NETLINK_URELEASE &&
1538 n->protocol == NETLINK_ISCSI && n->pid) {
1539 struct iscsi_cls_conn *conn;
1540 unsigned long flags;
1542 mempool_zone_complete(z_reply);
1543 spin_lock_irqsave(&connlock, flags);
1544 list_for_each_entry(conn, &connlist, conn_list) {
1545 mempool_zone_complete(conn->z_error);
1546 mempool_zone_complete(conn->z_pdu);
1548 spin_unlock_irqrestore(&connlock, flags);
1554 static struct notifier_block iscsi_nl_notifier = {
1555 .notifier_call = iscsi_rcv_nl_event,
1558 static __init int iscsi_transport_init(void)
1562 err = class_register(&iscsi_transport_class);
1566 err = transport_class_register(&iscsi_host_class);
1568 goto unregister_transport_class;
1570 err = transport_class_register(&iscsi_connection_class);
1572 goto unregister_host_class;
1574 err = transport_class_register(&iscsi_session_class);
1576 goto unregister_conn_class;
1578 err = netlink_register_notifier(&iscsi_nl_notifier);
1580 goto unregister_session_class;
1582 nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
1586 goto unregister_notifier;
1589 z_reply = mempool_zone_init(Z_MAX_REPLY,
1590 NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
1594 sock_release(nls->sk_socket);
1595 unregister_notifier:
1596 netlink_unregister_notifier(&iscsi_nl_notifier);
1597 unregister_session_class:
1598 transport_class_unregister(&iscsi_session_class);
1599 unregister_conn_class:
1600 transport_class_unregister(&iscsi_connection_class);
1601 unregister_host_class:
1602 transport_class_unregister(&iscsi_host_class);
1603 unregister_transport_class:
1604 class_unregister(&iscsi_transport_class);
1608 static void __exit iscsi_transport_exit(void)
1610 mempool_zone_destroy(z_reply);
1611 sock_release(nls->sk_socket);
1612 netlink_unregister_notifier(&iscsi_nl_notifier);
1613 transport_class_unregister(&iscsi_connection_class);
1614 transport_class_unregister(&iscsi_session_class);
1615 transport_class_unregister(&iscsi_host_class);
1616 class_unregister(&iscsi_transport_class);
1619 module_init(iscsi_transport_init);
1620 module_exit(iscsi_transport_exit);
1622 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1623 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1624 "Alex Aizman <itn780@yahoo.com>");
1625 MODULE_DESCRIPTION("iSCSI Transport Interface");
1626 MODULE_LICENSE("GPL");