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/mutex.h>
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_host.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/scsi_transport.h>
30 #include <scsi/scsi_transport_iscsi.h>
31 #include <scsi/iscsi_if.h>
33 #define ISCSI_SESSION_ATTRS 19
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
36 #define ISCSI_TRANSPORT_VERSION "2.0-869"
38 struct iscsi_internal {
40 struct scsi_transport_template t;
41 struct iscsi_transport *iscsi_transport;
42 struct list_head list;
45 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
52 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
53 static struct workqueue_struct *iscsi_eh_timer_workq;
56 * list of registered transports and lock that must
57 * be held while accessing list. The iscsi_transport_lock must
58 * be acquired after the rx_queue_mutex.
60 static LIST_HEAD(iscsi_transports);
61 static DEFINE_SPINLOCK(iscsi_transport_lock);
63 #define to_iscsi_internal(tmpl) \
64 container_of(tmpl, struct iscsi_internal, t)
66 #define dev_to_iscsi_internal(_dev) \
67 container_of(_dev, struct iscsi_internal, dev)
69 static void iscsi_transport_release(struct device *dev)
71 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
76 * iscsi_transport_class represents the iscsi_transports that are
79 static struct class iscsi_transport_class = {
80 .name = "iscsi_transport",
81 .dev_release = iscsi_transport_release,
85 show_transport_handle(struct device *dev, struct device_attribute *attr,
88 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
89 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
91 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
93 #define show_transport_attr(name, format) \
95 show_transport_##name(struct device *dev, \
96 struct device_attribute *attr,char *buf) \
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
99 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
101 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
103 show_transport_attr(caps, "0x%x");
104 show_transport_attr(max_lun, "%d");
106 static struct attribute *iscsi_transport_attrs[] = {
107 &dev_attr_handle.attr,
109 &dev_attr_max_lun.attr,
113 static struct attribute_group iscsi_transport_group = {
114 .attrs = iscsi_transport_attrs,
119 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
122 struct Scsi_Host *shost = dev_to_shost(dev);
123 struct iscsi_host *ihost = shost->shost_data;
125 memset(ihost, 0, sizeof(*ihost));
126 INIT_LIST_HEAD(&ihost->sessions);
127 mutex_init(&ihost->mutex);
128 atomic_set(&ihost->nr_scans, 0);
130 snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
132 ihost->scan_workq = create_singlethread_workqueue(
133 ihost->scan_workq_name);
134 if (!ihost->scan_workq)
139 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
142 struct Scsi_Host *shost = dev_to_shost(dev);
143 struct iscsi_host *ihost = shost->shost_data;
145 destroy_workqueue(ihost->scan_workq);
149 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
155 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
161 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
167 static struct sock *nls;
168 static DEFINE_MUTEX(rx_queue_mutex);
170 static LIST_HEAD(sesslist);
171 static DEFINE_SPINLOCK(sesslock);
172 static LIST_HEAD(connlist);
173 static DEFINE_SPINLOCK(connlock);
175 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
177 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
182 * Returns the matching session to a given sid
184 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
187 struct iscsi_cls_session *sess;
189 spin_lock_irqsave(&sesslock, flags);
190 list_for_each_entry(sess, &sesslist, sess_list) {
191 if (sess->sid == sid) {
192 spin_unlock_irqrestore(&sesslock, flags);
196 spin_unlock_irqrestore(&sesslock, flags);
201 * Returns the matching connection to a given sid / cid tuple
203 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
206 struct iscsi_cls_conn *conn;
208 spin_lock_irqsave(&connlock, flags);
209 list_for_each_entry(conn, &connlist, conn_list) {
210 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
211 spin_unlock_irqrestore(&connlock, flags);
215 spin_unlock_irqrestore(&connlock, flags);
220 * The following functions can be used by LLDs that allocate
221 * their own scsi_hosts or by software iscsi LLDs
226 } iscsi_session_state_names[] = {
227 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
228 { ISCSI_SESSION_FAILED, "FAILED" },
229 { ISCSI_SESSION_FREE, "FREE" },
232 static const char *iscsi_session_state_name(int state)
237 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
238 if (iscsi_session_state_names[i].value == state) {
239 name = iscsi_session_state_names[i].name;
246 int iscsi_session_chkready(struct iscsi_cls_session *session)
251 spin_lock_irqsave(&session->lock, flags);
252 switch (session->state) {
253 case ISCSI_SESSION_LOGGED_IN:
256 case ISCSI_SESSION_FAILED:
257 err = DID_IMM_RETRY << 16;
259 case ISCSI_SESSION_FREE:
260 err = DID_NO_CONNECT << 16;
263 err = DID_NO_CONNECT << 16;
266 spin_unlock_irqrestore(&session->lock, flags);
269 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
271 static void iscsi_session_release(struct device *dev)
273 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
274 struct Scsi_Host *shost;
276 shost = iscsi_session_to_shost(session);
277 scsi_host_put(shost);
281 static int iscsi_is_session_dev(const struct device *dev)
283 return dev->release == iscsi_session_release;
287 * iscsi_scan_finished - helper to report when running scans are done
289 * @time: scan run time
291 * This function can be used by drives like qla4xxx to report to the scsi
292 * layer when the scans it kicked off at module load time are done.
294 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
296 struct iscsi_host *ihost = shost->shost_data;
298 * qla4xxx will have kicked off some session unblocks before calling
299 * scsi_scan_host, so just wait for them to complete.
301 return !atomic_read(&ihost->nr_scans);
303 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
305 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
308 struct iscsi_host *ihost = shost->shost_data;
309 struct iscsi_cls_session *session;
311 mutex_lock(&ihost->mutex);
312 list_for_each_entry(session, &ihost->sessions, host_list) {
313 if ((channel == SCAN_WILD_CARD || channel == 0) &&
314 (id == SCAN_WILD_CARD || id == session->target_id))
315 scsi_scan_target(&session->dev, 0,
316 session->target_id, lun, 1);
318 mutex_unlock(&ihost->mutex);
323 static void iscsi_scan_session(struct work_struct *work)
325 struct iscsi_cls_session *session =
326 container_of(work, struct iscsi_cls_session, scan_work);
327 struct Scsi_Host *shost = iscsi_session_to_shost(session);
328 struct iscsi_host *ihost = shost->shost_data;
331 spin_lock_irqsave(&session->lock, flags);
332 if (session->state != ISCSI_SESSION_LOGGED_IN) {
333 spin_unlock_irqrestore(&session->lock, flags);
336 spin_unlock_irqrestore(&session->lock, flags);
338 scsi_scan_target(&session->dev, 0, session->target_id,
341 atomic_dec(&ihost->nr_scans);
344 static void session_recovery_timedout(struct work_struct *work)
346 struct iscsi_cls_session *session =
347 container_of(work, struct iscsi_cls_session,
351 iscsi_cls_session_printk(KERN_INFO, session,
352 "session recovery timed out after %d secs\n",
353 session->recovery_tmo);
355 spin_lock_irqsave(&session->lock, flags);
356 switch (session->state) {
357 case ISCSI_SESSION_FAILED:
358 session->state = ISCSI_SESSION_FREE;
360 case ISCSI_SESSION_LOGGED_IN:
361 case ISCSI_SESSION_FREE:
362 /* we raced with the unblock's flush */
363 spin_unlock_irqrestore(&session->lock, flags);
366 spin_unlock_irqrestore(&session->lock, flags);
368 if (session->transport->session_recovery_timedout)
369 session->transport->session_recovery_timedout(session);
371 scsi_target_unblock(&session->dev);
374 static void __iscsi_unblock_session(struct work_struct *work)
376 struct iscsi_cls_session *session =
377 container_of(work, struct iscsi_cls_session,
379 struct Scsi_Host *shost = iscsi_session_to_shost(session);
380 struct iscsi_host *ihost = shost->shost_data;
384 * The recovery and unblock work get run from the same workqueue,
385 * so try to cancel it if it was going to run after this unblock.
387 cancel_delayed_work(&session->recovery_work);
388 spin_lock_irqsave(&session->lock, flags);
389 session->state = ISCSI_SESSION_LOGGED_IN;
390 spin_unlock_irqrestore(&session->lock, flags);
392 scsi_target_unblock(&session->dev);
394 * Only do kernel scanning if the driver is properly hooked into
395 * the async scanning code (drivers like iscsi_tcp do login and
396 * scanning from userspace).
398 if (shost->hostt->scan_finished) {
399 if (queue_work(ihost->scan_workq, &session->scan_work))
400 atomic_inc(&ihost->nr_scans);
405 * iscsi_unblock_session - set a session as logged in and start IO.
406 * @session: iscsi session
408 * Mark a session as ready to accept IO.
410 void iscsi_unblock_session(struct iscsi_cls_session *session)
412 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
414 * make sure all the events have completed before tell the driver
417 flush_workqueue(iscsi_eh_timer_workq);
419 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
421 static void __iscsi_block_session(struct work_struct *work)
423 struct iscsi_cls_session *session =
424 container_of(work, struct iscsi_cls_session,
428 spin_lock_irqsave(&session->lock, flags);
429 session->state = ISCSI_SESSION_FAILED;
430 spin_unlock_irqrestore(&session->lock, flags);
431 scsi_target_block(&session->dev);
432 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
433 session->recovery_tmo * HZ);
436 void iscsi_block_session(struct iscsi_cls_session *session)
438 queue_work(iscsi_eh_timer_workq, &session->block_work);
440 EXPORT_SYMBOL_GPL(iscsi_block_session);
442 static void __iscsi_unbind_session(struct work_struct *work)
444 struct iscsi_cls_session *session =
445 container_of(work, struct iscsi_cls_session,
447 struct Scsi_Host *shost = iscsi_session_to_shost(session);
448 struct iscsi_host *ihost = shost->shost_data;
450 /* Prevent new scans and make sure scanning is not in progress */
451 mutex_lock(&ihost->mutex);
452 if (list_empty(&session->host_list)) {
453 mutex_unlock(&ihost->mutex);
456 list_del_init(&session->host_list);
457 mutex_unlock(&ihost->mutex);
459 scsi_remove_target(&session->dev);
460 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
463 static int iscsi_unbind_session(struct iscsi_cls_session *session)
465 struct Scsi_Host *shost = iscsi_session_to_shost(session);
466 struct iscsi_host *ihost = shost->shost_data;
468 return queue_work(ihost->scan_workq, &session->unbind_work);
471 struct iscsi_cls_session *
472 iscsi_alloc_session(struct Scsi_Host *shost,
473 struct iscsi_transport *transport)
475 struct iscsi_cls_session *session;
477 session = kzalloc(sizeof(*session) + transport->sessiondata_size,
482 session->transport = transport;
483 session->recovery_tmo = 120;
484 session->state = ISCSI_SESSION_FREE;
485 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
486 INIT_LIST_HEAD(&session->host_list);
487 INIT_LIST_HEAD(&session->sess_list);
488 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
489 INIT_WORK(&session->block_work, __iscsi_block_session);
490 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
491 INIT_WORK(&session->scan_work, iscsi_scan_session);
492 spin_lock_init(&session->lock);
494 /* this is released in the dev's release function */
495 scsi_host_get(shost);
496 session->dev.parent = &shost->shost_gendev;
497 session->dev.release = iscsi_session_release;
498 device_initialize(&session->dev);
499 if (transport->sessiondata_size)
500 session->dd_data = &session[1];
503 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
505 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
507 struct Scsi_Host *shost = iscsi_session_to_shost(session);
508 struct iscsi_host *ihost;
512 ihost = shost->shost_data;
513 session->sid = atomic_add_return(1, &iscsi_session_nr);
514 session->target_id = target_id;
516 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
518 err = device_add(&session->dev);
520 iscsi_cls_session_printk(KERN_ERR, session,
521 "could not register session's dev\n");
524 transport_register_device(&session->dev);
526 spin_lock_irqsave(&sesslock, flags);
527 list_add(&session->sess_list, &sesslist);
528 spin_unlock_irqrestore(&sesslock, flags);
530 mutex_lock(&ihost->mutex);
531 list_add(&session->host_list, &ihost->sessions);
532 mutex_unlock(&ihost->mutex);
534 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
538 scsi_host_put(shost);
541 EXPORT_SYMBOL_GPL(iscsi_add_session);
544 * iscsi_create_session - create iscsi class session
546 * @transport: iscsi transport
547 * @target_id: which target
549 * This can be called from a LLD or iscsi_transport.
551 struct iscsi_cls_session *
552 iscsi_create_session(struct Scsi_Host *shost,
553 struct iscsi_transport *transport,
554 unsigned int target_id)
556 struct iscsi_cls_session *session;
558 session = iscsi_alloc_session(shost, transport);
562 if (iscsi_add_session(session, target_id)) {
563 iscsi_free_session(session);
568 EXPORT_SYMBOL_GPL(iscsi_create_session);
570 static void iscsi_conn_release(struct device *dev)
572 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
573 struct device *parent = conn->dev.parent;
579 static int iscsi_is_conn_dev(const struct device *dev)
581 return dev->release == iscsi_conn_release;
584 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
586 if (!iscsi_is_conn_dev(dev))
588 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
591 void iscsi_remove_session(struct iscsi_cls_session *session)
593 struct Scsi_Host *shost = iscsi_session_to_shost(session);
594 struct iscsi_host *ihost = shost->shost_data;
598 spin_lock_irqsave(&sesslock, flags);
599 list_del(&session->sess_list);
600 spin_unlock_irqrestore(&sesslock, flags);
602 /* make sure there are no blocks/unblocks queued */
603 flush_workqueue(iscsi_eh_timer_workq);
604 /* make sure the timedout callout is not running */
605 if (!cancel_delayed_work(&session->recovery_work))
606 flush_workqueue(iscsi_eh_timer_workq);
608 * If we are blocked let commands flow again. The lld or iscsi
609 * layer should set up the queuecommand to fail commands.
610 * We assume that LLD will not be calling block/unblock while
611 * removing the session.
613 spin_lock_irqsave(&session->lock, flags);
614 session->state = ISCSI_SESSION_FREE;
615 spin_unlock_irqrestore(&session->lock, flags);
617 scsi_target_unblock(&session->dev);
618 /* flush running scans then delete devices */
619 flush_workqueue(ihost->scan_workq);
620 __iscsi_unbind_session(&session->unbind_work);
622 /* hw iscsi may not have removed all connections from session */
623 err = device_for_each_child(&session->dev, NULL,
624 iscsi_iter_destroy_conn_fn);
626 iscsi_cls_session_printk(KERN_ERR, session,
627 "Could not delete all connections "
628 "for session. Error %d.\n", err);
630 transport_unregister_device(&session->dev);
631 device_del(&session->dev);
633 EXPORT_SYMBOL_GPL(iscsi_remove_session);
635 void iscsi_free_session(struct iscsi_cls_session *session)
637 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
638 put_device(&session->dev);
640 EXPORT_SYMBOL_GPL(iscsi_free_session);
643 * iscsi_destroy_session - destroy iscsi session
644 * @session: iscsi_session
646 * Can be called by a LLD or iscsi_transport. There must not be
647 * any running connections.
649 int iscsi_destroy_session(struct iscsi_cls_session *session)
651 iscsi_remove_session(session);
652 iscsi_free_session(session);
655 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
658 * iscsi_create_conn - create iscsi class connection
659 * @session: iscsi cls session
660 * @cid: connection id
662 * This can be called from a LLD or iscsi_transport. The connection
663 * is child of the session so cid must be unique for all connections
666 * Since we do not support MCS, cid will normally be zero. In some cases
667 * for software iscsi we could be trying to preallocate a connection struct
668 * in which case there could be two connection structs and cid would be
671 struct iscsi_cls_conn *
672 iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
674 struct iscsi_transport *transport = session->transport;
675 struct iscsi_cls_conn *conn;
679 conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
683 if (transport->conndata_size)
684 conn->dd_data = &conn[1];
686 INIT_LIST_HEAD(&conn->conn_list);
687 conn->transport = transport;
690 /* this is released in the dev's release function */
691 if (!get_device(&session->dev))
694 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
696 conn->dev.parent = &session->dev;
697 conn->dev.release = iscsi_conn_release;
698 err = device_register(&conn->dev);
700 iscsi_cls_session_printk(KERN_ERR, session, "could not "
701 "register connection's dev\n");
702 goto release_parent_ref;
704 transport_register_device(&conn->dev);
706 spin_lock_irqsave(&connlock, flags);
707 list_add(&conn->conn_list, &connlist);
709 spin_unlock_irqrestore(&connlock, flags);
713 put_device(&session->dev);
719 EXPORT_SYMBOL_GPL(iscsi_create_conn);
722 * iscsi_destroy_conn - destroy iscsi class connection
723 * @conn: iscsi cls session
725 * This can be called from a LLD or iscsi_transport.
727 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
731 spin_lock_irqsave(&connlock, flags);
733 list_del(&conn->conn_list);
734 spin_unlock_irqrestore(&connlock, flags);
736 transport_unregister_device(&conn->dev);
737 device_unregister(&conn->dev);
740 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
743 * iscsi interface functions
745 static struct iscsi_internal *
746 iscsi_if_transport_lookup(struct iscsi_transport *tt)
748 struct iscsi_internal *priv;
751 spin_lock_irqsave(&iscsi_transport_lock, flags);
752 list_for_each_entry(priv, &iscsi_transports, list) {
753 if (tt == priv->iscsi_transport) {
754 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
758 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
763 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
767 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
769 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
777 iscsi_unicast_skb(struct sk_buff *skb, int pid)
781 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
783 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
790 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
791 char *data, uint32_t data_size)
793 struct nlmsghdr *nlh;
795 struct iscsi_uevent *ev;
797 struct iscsi_internal *priv;
798 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
801 priv = iscsi_if_transport_lookup(conn->transport);
805 skb = alloc_skb(len, GFP_ATOMIC);
807 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
808 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
809 "control PDU: OOM\n");
813 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
814 ev = NLMSG_DATA(nlh);
815 memset(ev, 0, sizeof(*ev));
816 ev->transport_handle = iscsi_handle(conn->transport);
817 ev->type = ISCSI_KEVENT_RECV_PDU;
818 ev->r.recv_req.cid = conn->cid;
819 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
820 pdu = (char*)ev + sizeof(*ev);
821 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
822 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
824 return iscsi_unicast_skb(skb, priv->daemon_pid);
826 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
828 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
830 struct nlmsghdr *nlh;
832 struct iscsi_uevent *ev;
833 struct iscsi_internal *priv;
834 int len = NLMSG_SPACE(sizeof(*ev));
836 priv = iscsi_if_transport_lookup(conn->transport);
840 skb = alloc_skb(len, GFP_ATOMIC);
842 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
843 "conn error (%d)\n", error);
847 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
848 ev = NLMSG_DATA(nlh);
849 ev->transport_handle = iscsi_handle(conn->transport);
850 ev->type = ISCSI_KEVENT_CONN_ERROR;
851 ev->r.connerror.error = error;
852 ev->r.connerror.cid = conn->cid;
853 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
855 iscsi_broadcast_skb(skb, GFP_ATOMIC);
857 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
860 EXPORT_SYMBOL_GPL(iscsi_conn_error);
863 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
864 void *payload, int size)
867 struct nlmsghdr *nlh;
868 int len = NLMSG_SPACE(size);
869 int flags = multi ? NLM_F_MULTI : 0;
870 int t = done ? NLMSG_DONE : type;
872 skb = alloc_skb(len, GFP_ATOMIC);
874 printk(KERN_ERR "Could not allocate skb to send reply.\n");
878 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
879 nlh->nlmsg_flags = flags;
880 memcpy(NLMSG_DATA(nlh), payload, size);
881 return iscsi_unicast_skb(skb, pid);
885 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
887 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
888 struct iscsi_stats *stats;
889 struct sk_buff *skbstat;
890 struct iscsi_cls_conn *conn;
891 struct nlmsghdr *nlhstat;
892 struct iscsi_uevent *evstat;
893 struct iscsi_internal *priv;
894 int len = NLMSG_SPACE(sizeof(*ev) +
895 sizeof(struct iscsi_stats) +
896 sizeof(struct iscsi_stats_custom) *
897 ISCSI_STATS_CUSTOM_MAX);
900 priv = iscsi_if_transport_lookup(transport);
904 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
911 skbstat = alloc_skb(len, GFP_ATOMIC);
913 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
914 "deliver stats: OOM\n");
918 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
919 (len - sizeof(*nlhstat)), 0);
920 evstat = NLMSG_DATA(nlhstat);
921 memset(evstat, 0, sizeof(*evstat));
922 evstat->transport_handle = iscsi_handle(conn->transport);
923 evstat->type = nlh->nlmsg_type;
924 evstat->u.get_stats.cid =
926 evstat->u.get_stats.sid =
928 stats = (struct iscsi_stats *)
929 ((char*)evstat + sizeof(*evstat));
930 memset(stats, 0, sizeof(*stats));
932 transport->get_stats(conn, stats);
933 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
934 sizeof(struct iscsi_stats) +
935 sizeof(struct iscsi_stats_custom) *
936 stats->custom_length);
937 actual_size -= sizeof(*nlhstat);
938 actual_size = NLMSG_LENGTH(actual_size);
939 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
940 nlhstat->nlmsg_len = actual_size;
942 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
943 } while (err < 0 && err != -ECONNREFUSED);
949 * iscsi_session_event - send session destr. completion event
950 * @session: iscsi class session
951 * @event: type of event
953 int iscsi_session_event(struct iscsi_cls_session *session,
954 enum iscsi_uevent_e event)
956 struct iscsi_internal *priv;
957 struct Scsi_Host *shost;
958 struct iscsi_uevent *ev;
960 struct nlmsghdr *nlh;
961 int rc, len = NLMSG_SPACE(sizeof(*ev));
963 priv = iscsi_if_transport_lookup(session->transport);
966 shost = iscsi_session_to_shost(session);
968 skb = alloc_skb(len, GFP_KERNEL);
970 iscsi_cls_session_printk(KERN_ERR, session,
971 "Cannot notify userspace of session "
972 "event %u\n", event);
976 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
977 ev = NLMSG_DATA(nlh);
978 ev->transport_handle = iscsi_handle(session->transport);
982 case ISCSI_KEVENT_DESTROY_SESSION:
983 ev->r.d_session.host_no = shost->host_no;
984 ev->r.d_session.sid = session->sid;
986 case ISCSI_KEVENT_CREATE_SESSION:
987 ev->r.c_session_ret.host_no = shost->host_no;
988 ev->r.c_session_ret.sid = session->sid;
990 case ISCSI_KEVENT_UNBIND_SESSION:
991 ev->r.unbind_session.host_no = shost->host_no;
992 ev->r.unbind_session.sid = session->sid;
995 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1002 * this will occur if the daemon is not up, so we just warn
1003 * the user and when the daemon is restarted it will handle it
1005 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1007 iscsi_cls_session_printk(KERN_ERR, session,
1008 "Cannot notify userspace of session "
1009 "event %u. Check iscsi daemon\n",
1013 EXPORT_SYMBOL_GPL(iscsi_session_event);
1016 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev,
1017 uint32_t host_no, uint32_t initial_cmdsn,
1018 uint16_t cmds_max, uint16_t queue_depth)
1020 struct iscsi_transport *transport = priv->iscsi_transport;
1021 struct iscsi_cls_session *session;
1022 struct Scsi_Host *shost = NULL;
1025 * Software iscsi allocates a host per session, but
1026 * offload drivers (and possibly iser one day) allocate a host per
1027 * hba/nic/rnic. Offload will match a host here, but software will
1028 * return a new hostno after the create_session callback has returned.
1030 if (host_no != UINT_MAX) {
1031 shost = scsi_host_lookup(host_no);
1032 if (IS_ERR(shost)) {
1033 printk(KERN_ERR "Could not find host no %u to "
1034 "create session\n", host_no);
1039 session = transport->create_session(transport, &priv->t, shost,
1040 cmds_max, queue_depth,
1041 initial_cmdsn, &host_no);
1043 scsi_host_put(shost);
1047 ev->r.c_session_ret.host_no = host_no;
1048 ev->r.c_session_ret.sid = session->sid;
1053 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1055 struct iscsi_cls_conn *conn;
1056 struct iscsi_cls_session *session;
1058 session = iscsi_session_lookup(ev->u.c_conn.sid);
1060 printk(KERN_ERR "iscsi: invalid session %d.\n",
1065 conn = transport->create_conn(session, ev->u.c_conn.cid);
1067 iscsi_cls_session_printk(KERN_ERR, session,
1068 "couldn't create a new connection.");
1072 ev->r.c_conn_ret.sid = session->sid;
1073 ev->r.c_conn_ret.cid = conn->cid;
1078 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1080 struct iscsi_cls_conn *conn;
1082 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1086 if (transport->destroy_conn)
1087 transport->destroy_conn(conn);
1092 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1094 char *data = (char*)ev + sizeof(*ev);
1095 struct iscsi_cls_conn *conn;
1096 struct iscsi_cls_session *session;
1097 int err = 0, value = 0;
1099 session = iscsi_session_lookup(ev->u.set_param.sid);
1100 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1101 if (!conn || !session)
1104 switch (ev->u.set_param.param) {
1105 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1106 sscanf(data, "%d", &value);
1108 session->recovery_tmo = value;
1111 err = transport->set_param(conn, ev->u.set_param.param,
1112 data, ev->u.set_param.len);
1119 iscsi_if_transport_ep(struct iscsi_transport *transport,
1120 struct iscsi_uevent *ev, int msg_type)
1122 struct sockaddr *dst_addr;
1126 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1127 if (!transport->ep_connect)
1130 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1131 rc = transport->ep_connect(dst_addr,
1132 ev->u.ep_connect.non_blocking,
1133 &ev->r.ep_connect_ret.handle);
1135 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1136 if (!transport->ep_poll)
1139 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
1140 ev->u.ep_poll.timeout_ms);
1142 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1143 if (!transport->ep_disconnect)
1146 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
1153 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1154 struct iscsi_uevent *ev)
1156 struct Scsi_Host *shost;
1157 struct sockaddr *dst_addr;
1160 if (!transport->tgt_dscvr)
1163 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1164 if (IS_ERR(shost)) {
1165 printk(KERN_ERR "target discovery could not find host no %u\n",
1166 ev->u.tgt_dscvr.host_no);
1171 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1172 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1173 ev->u.tgt_dscvr.enable, dst_addr);
1174 scsi_host_put(shost);
1179 iscsi_set_host_param(struct iscsi_transport *transport,
1180 struct iscsi_uevent *ev)
1182 char *data = (char*)ev + sizeof(*ev);
1183 struct Scsi_Host *shost;
1186 if (!transport->set_host_param)
1189 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1190 if (IS_ERR(shost)) {
1191 printk(KERN_ERR "set_host_param could not find host no %u\n",
1192 ev->u.set_host_param.host_no);
1196 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1197 data, ev->u.set_host_param.len);
1198 scsi_host_put(shost);
1203 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1206 uint32_t host_no = UINT_MAX;
1207 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1208 struct iscsi_transport *transport = NULL;
1209 struct iscsi_internal *priv;
1210 struct iscsi_cls_session *session;
1211 struct iscsi_cls_conn *conn;
1213 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1216 transport = priv->iscsi_transport;
1218 if (!try_module_get(transport->owner))
1221 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1223 switch (nlh->nlmsg_type) {
1224 case ISCSI_UEVENT_CREATE_SESSION:
1225 err = iscsi_if_create_session(priv, ev, host_no,
1226 ev->u.c_session.initial_cmdsn,
1227 ev->u.c_session.cmds_max,
1228 ev->u.c_session.queue_depth);
1230 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1231 err = iscsi_if_create_session(priv, ev,
1232 ev->u.c_bound_session.host_no,
1233 ev->u.c_bound_session.initial_cmdsn,
1234 ev->u.c_bound_session.cmds_max,
1235 ev->u.c_bound_session.queue_depth);
1237 case ISCSI_UEVENT_DESTROY_SESSION:
1238 session = iscsi_session_lookup(ev->u.d_session.sid);
1240 transport->destroy_session(session);
1244 case ISCSI_UEVENT_UNBIND_SESSION:
1245 session = iscsi_session_lookup(ev->u.d_session.sid);
1247 iscsi_unbind_session(session);
1251 case ISCSI_UEVENT_CREATE_CONN:
1252 err = iscsi_if_create_conn(transport, ev);
1254 case ISCSI_UEVENT_DESTROY_CONN:
1255 err = iscsi_if_destroy_conn(transport, ev);
1257 case ISCSI_UEVENT_BIND_CONN:
1258 session = iscsi_session_lookup(ev->u.b_conn.sid);
1259 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1261 if (session && conn)
1262 ev->r.retcode = transport->bind_conn(session, conn,
1263 ev->u.b_conn.transport_eph,
1264 ev->u.b_conn.is_leading);
1268 case ISCSI_UEVENT_SET_PARAM:
1269 err = iscsi_set_param(transport, ev);
1271 case ISCSI_UEVENT_START_CONN:
1272 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1274 ev->r.retcode = transport->start_conn(conn);
1278 case ISCSI_UEVENT_STOP_CONN:
1279 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1281 transport->stop_conn(conn, ev->u.stop_conn.flag);
1285 case ISCSI_UEVENT_SEND_PDU:
1286 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1288 ev->r.retcode = transport->send_pdu(conn,
1289 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1290 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1291 ev->u.send_pdu.data_size);
1295 case ISCSI_UEVENT_GET_STATS:
1296 err = iscsi_if_get_stats(transport, nlh);
1298 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1299 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1300 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1301 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1303 case ISCSI_UEVENT_TGT_DSCVR:
1304 err = iscsi_tgt_dscvr(transport, ev);
1306 case ISCSI_UEVENT_SET_HOST_PARAM:
1307 err = iscsi_set_host_param(transport, ev);
1314 module_put(transport->owner);
1319 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1320 * Malformed skbs with wrong lengths or invalid creds are not processed.
1323 iscsi_if_rx(struct sk_buff *skb)
1325 mutex_lock(&rx_queue_mutex);
1326 while (skb->len >= NLMSG_SPACE(0)) {
1329 struct nlmsghdr *nlh;
1330 struct iscsi_uevent *ev;
1332 nlh = nlmsg_hdr(skb);
1333 if (nlh->nlmsg_len < sizeof(*nlh) ||
1334 skb->len < nlh->nlmsg_len) {
1338 ev = NLMSG_DATA(nlh);
1339 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1340 if (rlen > skb->len)
1343 err = iscsi_if_recv_msg(skb, nlh);
1345 ev->type = ISCSI_KEVENT_IF_ERROR;
1350 * special case for GET_STATS:
1351 * on success - sending reply and stats from
1352 * inside of if_recv_msg(),
1353 * on error - fall through.
1355 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1357 err = iscsi_if_send_reply(
1358 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1359 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1360 } while (err < 0 && err != -ECONNREFUSED);
1361 skb_pull(skb, rlen);
1363 mutex_unlock(&rx_queue_mutex);
1366 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1367 struct device_attribute dev_attr_##_prefix##_##_name = \
1368 __ATTR(_name,_mode,_show,_store)
1371 * iSCSI connection attrs
1373 #define iscsi_conn_attr_show(param) \
1375 show_conn_param_##param(struct device *dev, \
1376 struct device_attribute *attr, char *buf) \
1378 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1379 struct iscsi_transport *t = conn->transport; \
1380 return t->get_conn_param(conn, param, buf); \
1383 #define iscsi_conn_attr(field, param) \
1384 iscsi_conn_attr_show(param) \
1385 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1388 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1389 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1390 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1391 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1392 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1393 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1394 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1395 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1396 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1397 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1398 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1399 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1400 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1403 * iSCSI session attrs
1405 #define iscsi_session_attr_show(param, perm) \
1407 show_session_param_##param(struct device *dev, \
1408 struct device_attribute *attr, char *buf) \
1410 struct iscsi_cls_session *session = \
1411 iscsi_dev_to_session(dev->parent); \
1412 struct iscsi_transport *t = session->transport; \
1414 if (perm && !capable(CAP_SYS_ADMIN)) \
1416 return t->get_session_param(session, param, buf); \
1419 #define iscsi_session_attr(field, param, perm) \
1420 iscsi_session_attr_show(param, perm) \
1421 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1424 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1425 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1426 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1427 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1428 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1429 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1430 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1431 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1432 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1433 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1434 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1435 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1436 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1437 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1438 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1439 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1440 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1443 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1446 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1447 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1449 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1452 #define iscsi_priv_session_attr_show(field, format) \
1454 show_priv_session_##field(struct device *dev, \
1455 struct device_attribute *attr, char *buf) \
1457 struct iscsi_cls_session *session = \
1458 iscsi_dev_to_session(dev->parent); \
1459 return sprintf(buf, format"\n", session->field); \
1462 #define iscsi_priv_session_attr(field, format) \
1463 iscsi_priv_session_attr_show(field, format) \
1464 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1466 iscsi_priv_session_attr(recovery_tmo, "%d");
1471 #define iscsi_host_attr_show(param) \
1473 show_host_param_##param(struct device *dev, \
1474 struct device_attribute *attr, char *buf) \
1476 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1477 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1478 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1481 #define iscsi_host_attr(field, param) \
1482 iscsi_host_attr_show(param) \
1483 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1486 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1487 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1488 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1489 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1491 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1493 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1498 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1500 if (tt->param_mask & param_flag) { \
1501 priv->session_attrs[count] = &dev_attr_sess_##field; \
1506 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1508 if (tt->param_mask & param_flag) { \
1509 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1514 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1516 if (tt->host_param_mask & param_flag) { \
1517 priv->host_attrs[count] = &dev_attr_host_##field; \
1522 static int iscsi_session_match(struct attribute_container *cont,
1525 struct iscsi_cls_session *session;
1526 struct Scsi_Host *shost;
1527 struct iscsi_internal *priv;
1529 if (!iscsi_is_session_dev(dev))
1532 session = iscsi_dev_to_session(dev);
1533 shost = iscsi_session_to_shost(session);
1534 if (!shost->transportt)
1537 priv = to_iscsi_internal(shost->transportt);
1538 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1541 return &priv->session_cont.ac == cont;
1544 static int iscsi_conn_match(struct attribute_container *cont,
1547 struct iscsi_cls_session *session;
1548 struct iscsi_cls_conn *conn;
1549 struct Scsi_Host *shost;
1550 struct iscsi_internal *priv;
1552 if (!iscsi_is_conn_dev(dev))
1555 conn = iscsi_dev_to_conn(dev);
1556 session = iscsi_dev_to_session(conn->dev.parent);
1557 shost = iscsi_session_to_shost(session);
1559 if (!shost->transportt)
1562 priv = to_iscsi_internal(shost->transportt);
1563 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1566 return &priv->conn_cont.ac == cont;
1569 static int iscsi_host_match(struct attribute_container *cont,
1572 struct Scsi_Host *shost;
1573 struct iscsi_internal *priv;
1575 if (!scsi_is_host_device(dev))
1578 shost = dev_to_shost(dev);
1579 if (!shost->transportt ||
1580 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1583 priv = to_iscsi_internal(shost->transportt);
1584 return &priv->t.host_attrs.ac == cont;
1587 struct scsi_transport_template *
1588 iscsi_register_transport(struct iscsi_transport *tt)
1590 struct iscsi_internal *priv;
1591 unsigned long flags;
1596 priv = iscsi_if_transport_lookup(tt);
1600 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1603 INIT_LIST_HEAD(&priv->list);
1604 priv->daemon_pid = -1;
1605 priv->iscsi_transport = tt;
1606 priv->t.user_scan = iscsi_user_scan;
1608 priv->dev.class = &iscsi_transport_class;
1609 snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name);
1610 err = device_register(&priv->dev);
1614 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1616 goto unregister_dev;
1618 /* host parameters */
1619 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1620 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1621 priv->t.host_attrs.ac.match = iscsi_host_match;
1622 priv->t.host_size = sizeof(struct iscsi_host);
1623 transport_container_register(&priv->t.host_attrs);
1625 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1626 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1627 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1628 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1629 BUG_ON(count > ISCSI_HOST_ATTRS);
1630 priv->host_attrs[count] = NULL;
1633 /* connection parameters */
1634 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1635 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1636 priv->conn_cont.ac.match = iscsi_conn_match;
1637 transport_container_register(&priv->conn_cont);
1639 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1640 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1641 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1642 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1643 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1644 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1645 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1646 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1647 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1648 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1649 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1650 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1651 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1653 BUG_ON(count > ISCSI_CONN_ATTRS);
1654 priv->conn_attrs[count] = NULL;
1657 /* session parameters */
1658 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1659 priv->session_cont.ac.class = &iscsi_session_class.class;
1660 priv->session_cont.ac.match = iscsi_session_match;
1661 transport_container_register(&priv->session_cont);
1663 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1664 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1665 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1666 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1667 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1668 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1669 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1670 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1671 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1672 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1673 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1674 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1675 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1676 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1677 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1678 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1679 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1680 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1681 SETUP_PRIV_SESSION_RD_ATTR(state);
1683 BUG_ON(count > ISCSI_SESSION_ATTRS);
1684 priv->session_attrs[count] = NULL;
1686 spin_lock_irqsave(&iscsi_transport_lock, flags);
1687 list_add(&priv->list, &iscsi_transports);
1688 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1690 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1694 device_unregister(&priv->dev);
1699 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1701 int iscsi_unregister_transport(struct iscsi_transport *tt)
1703 struct iscsi_internal *priv;
1704 unsigned long flags;
1708 mutex_lock(&rx_queue_mutex);
1710 priv = iscsi_if_transport_lookup(tt);
1713 spin_lock_irqsave(&iscsi_transport_lock, flags);
1714 list_del(&priv->list);
1715 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1717 transport_container_unregister(&priv->conn_cont);
1718 transport_container_unregister(&priv->session_cont);
1719 transport_container_unregister(&priv->t.host_attrs);
1721 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1722 device_unregister(&priv->dev);
1723 mutex_unlock(&rx_queue_mutex);
1727 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1729 static __init int iscsi_transport_init(void)
1733 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1734 ISCSI_TRANSPORT_VERSION);
1736 atomic_set(&iscsi_session_nr, 0);
1738 err = class_register(&iscsi_transport_class);
1742 err = transport_class_register(&iscsi_host_class);
1744 goto unregister_transport_class;
1746 err = transport_class_register(&iscsi_connection_class);
1748 goto unregister_host_class;
1750 err = transport_class_register(&iscsi_session_class);
1752 goto unregister_conn_class;
1754 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
1758 goto unregister_session_class;
1761 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1762 if (!iscsi_eh_timer_workq)
1768 netlink_kernel_release(nls);
1769 unregister_session_class:
1770 transport_class_unregister(&iscsi_session_class);
1771 unregister_conn_class:
1772 transport_class_unregister(&iscsi_connection_class);
1773 unregister_host_class:
1774 transport_class_unregister(&iscsi_host_class);
1775 unregister_transport_class:
1776 class_unregister(&iscsi_transport_class);
1780 static void __exit iscsi_transport_exit(void)
1782 destroy_workqueue(iscsi_eh_timer_workq);
1783 netlink_kernel_release(nls);
1784 transport_class_unregister(&iscsi_connection_class);
1785 transport_class_unregister(&iscsi_session_class);
1786 transport_class_unregister(&iscsi_host_class);
1787 class_unregister(&iscsi_transport_class);
1790 module_init(iscsi_transport_init);
1791 module_exit(iscsi_transport_exit);
1793 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1794 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1795 "Alex Aizman <itn780@yahoo.com>");
1796 MODULE_DESCRIPTION("iSCSI Transport Interface");
1797 MODULE_LICENSE("GPL");
1798 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);