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 21
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
37 #define ISCSI_TRANSPORT_VERSION "2.0-870"
39 struct iscsi_internal
{
41 struct scsi_transport_template t
;
42 struct iscsi_transport
*iscsi_transport
;
43 struct list_head list
;
46 struct device_attribute
*host_attrs
[ISCSI_HOST_ATTRS
+ 1];
47 struct transport_container conn_cont
;
48 struct device_attribute
*conn_attrs
[ISCSI_CONN_ATTRS
+ 1];
49 struct transport_container session_cont
;
50 struct device_attribute
*session_attrs
[ISCSI_SESSION_ATTRS
+ 1];
53 static atomic_t iscsi_session_nr
; /* sysfs session id for next new session */
54 static struct workqueue_struct
*iscsi_eh_timer_workq
;
57 * list of registered transports and lock that must
58 * be held while accessing list. The iscsi_transport_lock must
59 * be acquired after the rx_queue_mutex.
61 static LIST_HEAD(iscsi_transports
);
62 static DEFINE_SPINLOCK(iscsi_transport_lock
);
64 #define to_iscsi_internal(tmpl) \
65 container_of(tmpl, struct iscsi_internal, t)
67 #define dev_to_iscsi_internal(_dev) \
68 container_of(_dev, struct iscsi_internal, dev)
70 static void iscsi_transport_release(struct device
*dev
)
72 struct iscsi_internal
*priv
= dev_to_iscsi_internal(dev
);
77 * iscsi_transport_class represents the iscsi_transports that are
80 static struct class iscsi_transport_class
= {
81 .name
= "iscsi_transport",
82 .dev_release
= iscsi_transport_release
,
86 show_transport_handle(struct device
*dev
, struct device_attribute
*attr
,
89 struct iscsi_internal
*priv
= dev_to_iscsi_internal(dev
);
90 return sprintf(buf
, "%llu\n", (unsigned long long)iscsi_handle(priv
->iscsi_transport
));
92 static DEVICE_ATTR(handle
, S_IRUGO
, show_transport_handle
, NULL
);
94 #define show_transport_attr(name, format) \
96 show_transport_##name(struct device *dev, \
97 struct device_attribute *attr,char *buf) \
99 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
100 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
102 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
104 show_transport_attr(caps
, "0x%x");
106 static struct attribute
*iscsi_transport_attrs
[] = {
107 &dev_attr_handle
.attr
,
112 static struct attribute_group iscsi_transport_group
= {
113 .attrs
= iscsi_transport_attrs
,
117 * iSCSI endpoint attrs
119 #define iscsi_dev_to_endpoint(_dev) \
120 container_of(_dev, struct iscsi_endpoint, dev)
122 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
123 struct device_attribute dev_attr_##_prefix##_##_name = \
124 __ATTR(_name,_mode,_show,_store)
126 static void iscsi_endpoint_release(struct device
*dev
)
128 struct iscsi_endpoint
*ep
= iscsi_dev_to_endpoint(dev
);
132 static struct class iscsi_endpoint_class
= {
133 .name
= "iscsi_endpoint",
134 .dev_release
= iscsi_endpoint_release
,
138 show_ep_handle(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
140 struct iscsi_endpoint
*ep
= iscsi_dev_to_endpoint(dev
);
141 return sprintf(buf
, "%llu\n", (unsigned long long) ep
->id
);
143 static ISCSI_ATTR(ep
, handle
, S_IRUGO
, show_ep_handle
, NULL
);
145 static struct attribute
*iscsi_endpoint_attrs
[] = {
146 &dev_attr_ep_handle
.attr
,
150 static struct attribute_group iscsi_endpoint_group
= {
151 .attrs
= iscsi_endpoint_attrs
,
154 #define ISCSI_MAX_EPID -1
156 static int iscsi_match_epid(struct device
*dev
, void *data
)
158 struct iscsi_endpoint
*ep
= iscsi_dev_to_endpoint(dev
);
159 uint64_t *epid
= (uint64_t *) data
;
161 return *epid
== ep
->id
;
164 struct iscsi_endpoint
*
165 iscsi_create_endpoint(int dd_size
)
168 struct iscsi_endpoint
*ep
;
172 for (id
= 1; id
< ISCSI_MAX_EPID
; id
++) {
173 dev
= class_find_device(&iscsi_endpoint_class
, NULL
, &id
,
178 if (id
== ISCSI_MAX_EPID
) {
179 printk(KERN_ERR
"Too many connections. Max supported %u\n",
184 ep
= kzalloc(sizeof(*ep
) + dd_size
, GFP_KERNEL
);
189 ep
->dev
.class = &iscsi_endpoint_class
;
190 dev_set_name(&ep
->dev
, "ep-%llu", (unsigned long long) id
);
191 err
= device_register(&ep
->dev
);
195 err
= sysfs_create_group(&ep
->dev
.kobj
, &iscsi_endpoint_group
);
200 ep
->dd_data
= &ep
[1];
204 device_unregister(&ep
->dev
);
211 EXPORT_SYMBOL_GPL(iscsi_create_endpoint
);
213 void iscsi_destroy_endpoint(struct iscsi_endpoint
*ep
)
215 sysfs_remove_group(&ep
->dev
.kobj
, &iscsi_endpoint_group
);
216 device_unregister(&ep
->dev
);
218 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint
);
220 struct iscsi_endpoint
*iscsi_lookup_endpoint(u64 handle
)
222 struct iscsi_endpoint
*ep
;
225 dev
= class_find_device(&iscsi_endpoint_class
, NULL
, &handle
,
230 ep
= iscsi_dev_to_endpoint(dev
);
232 * we can drop this now because the interface will prevent
233 * removals and lookups from racing.
238 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint
);
240 static int iscsi_setup_host(struct transport_container
*tc
, struct device
*dev
,
243 struct Scsi_Host
*shost
= dev_to_shost(dev
);
244 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
246 memset(ihost
, 0, sizeof(*ihost
));
247 atomic_set(&ihost
->nr_scans
, 0);
248 mutex_init(&ihost
->mutex
);
250 snprintf(ihost
->scan_workq_name
, sizeof(ihost
->scan_workq_name
),
251 "iscsi_scan_%d", shost
->host_no
);
252 ihost
->scan_workq
= create_singlethread_workqueue(
253 ihost
->scan_workq_name
);
254 if (!ihost
->scan_workq
)
259 static int iscsi_remove_host(struct transport_container
*tc
, struct device
*dev
,
262 struct Scsi_Host
*shost
= dev_to_shost(dev
);
263 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
265 destroy_workqueue(ihost
->scan_workq
);
269 static DECLARE_TRANSPORT_CLASS(iscsi_host_class
,
275 static DECLARE_TRANSPORT_CLASS(iscsi_session_class
,
281 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class
,
287 static struct sock
*nls
;
288 static DEFINE_MUTEX(rx_queue_mutex
);
290 static LIST_HEAD(sesslist
);
291 static DEFINE_SPINLOCK(sesslock
);
292 static LIST_HEAD(connlist
);
293 static DEFINE_SPINLOCK(connlock
);
295 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn
*conn
)
297 struct iscsi_cls_session
*sess
= iscsi_dev_to_session(conn
->dev
.parent
);
302 * Returns the matching session to a given sid
304 static struct iscsi_cls_session
*iscsi_session_lookup(uint32_t sid
)
307 struct iscsi_cls_session
*sess
;
309 spin_lock_irqsave(&sesslock
, flags
);
310 list_for_each_entry(sess
, &sesslist
, sess_list
) {
311 if (sess
->sid
== sid
) {
312 spin_unlock_irqrestore(&sesslock
, flags
);
316 spin_unlock_irqrestore(&sesslock
, flags
);
321 * Returns the matching connection to a given sid / cid tuple
323 static struct iscsi_cls_conn
*iscsi_conn_lookup(uint32_t sid
, uint32_t cid
)
326 struct iscsi_cls_conn
*conn
;
328 spin_lock_irqsave(&connlock
, flags
);
329 list_for_each_entry(conn
, &connlist
, conn_list
) {
330 if ((conn
->cid
== cid
) && (iscsi_conn_get_sid(conn
) == sid
)) {
331 spin_unlock_irqrestore(&connlock
, flags
);
335 spin_unlock_irqrestore(&connlock
, flags
);
340 * The following functions can be used by LLDs that allocate
341 * their own scsi_hosts or by software iscsi LLDs
346 } iscsi_session_state_names
[] = {
347 { ISCSI_SESSION_LOGGED_IN
, "LOGGED_IN" },
348 { ISCSI_SESSION_FAILED
, "FAILED" },
349 { ISCSI_SESSION_FREE
, "FREE" },
352 static const char *iscsi_session_state_name(int state
)
357 for (i
= 0; i
< ARRAY_SIZE(iscsi_session_state_names
); i
++) {
358 if (iscsi_session_state_names
[i
].value
== state
) {
359 name
= iscsi_session_state_names
[i
].name
;
366 int iscsi_session_chkready(struct iscsi_cls_session
*session
)
371 spin_lock_irqsave(&session
->lock
, flags
);
372 switch (session
->state
) {
373 case ISCSI_SESSION_LOGGED_IN
:
376 case ISCSI_SESSION_FAILED
:
377 err
= DID_TRANSPORT_DISRUPTED
<< 16;
379 case ISCSI_SESSION_FREE
:
380 err
= DID_TRANSPORT_FAILFAST
<< 16;
383 err
= DID_NO_CONNECT
<< 16;
386 spin_unlock_irqrestore(&session
->lock
, flags
);
389 EXPORT_SYMBOL_GPL(iscsi_session_chkready
);
391 static void iscsi_session_release(struct device
*dev
)
393 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
);
394 struct Scsi_Host
*shost
;
396 shost
= iscsi_session_to_shost(session
);
397 scsi_host_put(shost
);
401 static int iscsi_is_session_dev(const struct device
*dev
)
403 return dev
->release
== iscsi_session_release
;
406 static int iscsi_iter_session_fn(struct device
*dev
, void *data
)
408 void (* fn
) (struct iscsi_cls_session
*) = data
;
410 if (!iscsi_is_session_dev(dev
))
412 fn(iscsi_dev_to_session(dev
));
416 void iscsi_host_for_each_session(struct Scsi_Host
*shost
,
417 void (*fn
)(struct iscsi_cls_session
*))
419 device_for_each_child(&shost
->shost_gendev
, fn
,
420 iscsi_iter_session_fn
);
422 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session
);
425 * iscsi_scan_finished - helper to report when running scans are done
427 * @time: scan run time
429 * This function can be used by drives like qla4xxx to report to the scsi
430 * layer when the scans it kicked off at module load time are done.
432 int iscsi_scan_finished(struct Scsi_Host
*shost
, unsigned long time
)
434 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
436 * qla4xxx will have kicked off some session unblocks before calling
437 * scsi_scan_host, so just wait for them to complete.
439 return !atomic_read(&ihost
->nr_scans
);
441 EXPORT_SYMBOL_GPL(iscsi_scan_finished
);
443 struct iscsi_scan_data
{
444 unsigned int channel
;
449 static int iscsi_user_scan_session(struct device
*dev
, void *data
)
451 struct iscsi_scan_data
*scan_data
= data
;
452 struct iscsi_cls_session
*session
;
453 struct Scsi_Host
*shost
;
454 struct iscsi_cls_host
*ihost
;
458 if (!iscsi_is_session_dev(dev
))
461 session
= iscsi_dev_to_session(dev
);
462 shost
= iscsi_session_to_shost(session
);
463 ihost
= shost
->shost_data
;
465 mutex_lock(&ihost
->mutex
);
466 spin_lock_irqsave(&session
->lock
, flags
);
467 if (session
->state
!= ISCSI_SESSION_LOGGED_IN
) {
468 spin_unlock_irqrestore(&session
->lock
, flags
);
469 mutex_unlock(&ihost
->mutex
);
472 id
= session
->target_id
;
473 spin_unlock_irqrestore(&session
->lock
, flags
);
475 if (id
!= ISCSI_MAX_TARGET
) {
476 if ((scan_data
->channel
== SCAN_WILD_CARD
||
477 scan_data
->channel
== 0) &&
478 (scan_data
->id
== SCAN_WILD_CARD
||
479 scan_data
->id
== id
))
480 scsi_scan_target(&session
->dev
, 0, id
,
483 mutex_unlock(&ihost
->mutex
);
487 static int iscsi_user_scan(struct Scsi_Host
*shost
, uint channel
,
490 struct iscsi_scan_data scan_data
;
492 scan_data
.channel
= channel
;
496 return device_for_each_child(&shost
->shost_gendev
, &scan_data
,
497 iscsi_user_scan_session
);
500 static void iscsi_scan_session(struct work_struct
*work
)
502 struct iscsi_cls_session
*session
=
503 container_of(work
, struct iscsi_cls_session
, scan_work
);
504 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
505 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
506 struct iscsi_scan_data scan_data
;
508 scan_data
.channel
= 0;
509 scan_data
.id
= SCAN_WILD_CARD
;
510 scan_data
.lun
= SCAN_WILD_CARD
;
512 iscsi_user_scan_session(&session
->dev
, &scan_data
);
513 atomic_dec(&ihost
->nr_scans
);
516 static void session_recovery_timedout(struct work_struct
*work
)
518 struct iscsi_cls_session
*session
=
519 container_of(work
, struct iscsi_cls_session
,
523 iscsi_cls_session_printk(KERN_INFO
, session
,
524 "session recovery timed out after %d secs\n",
525 session
->recovery_tmo
);
527 spin_lock_irqsave(&session
->lock
, flags
);
528 switch (session
->state
) {
529 case ISCSI_SESSION_FAILED
:
530 session
->state
= ISCSI_SESSION_FREE
;
532 case ISCSI_SESSION_LOGGED_IN
:
533 case ISCSI_SESSION_FREE
:
534 /* we raced with the unblock's flush */
535 spin_unlock_irqrestore(&session
->lock
, flags
);
538 spin_unlock_irqrestore(&session
->lock
, flags
);
540 if (session
->transport
->session_recovery_timedout
)
541 session
->transport
->session_recovery_timedout(session
);
543 scsi_target_unblock(&session
->dev
);
546 static void __iscsi_unblock_session(struct work_struct
*work
)
548 struct iscsi_cls_session
*session
=
549 container_of(work
, struct iscsi_cls_session
,
551 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
552 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
556 * The recovery and unblock work get run from the same workqueue,
557 * so try to cancel it if it was going to run after this unblock.
559 cancel_delayed_work(&session
->recovery_work
);
560 spin_lock_irqsave(&session
->lock
, flags
);
561 session
->state
= ISCSI_SESSION_LOGGED_IN
;
562 spin_unlock_irqrestore(&session
->lock
, flags
);
564 scsi_target_unblock(&session
->dev
);
566 * Only do kernel scanning if the driver is properly hooked into
567 * the async scanning code (drivers like iscsi_tcp do login and
568 * scanning from userspace).
570 if (shost
->hostt
->scan_finished
) {
571 if (queue_work(ihost
->scan_workq
, &session
->scan_work
))
572 atomic_inc(&ihost
->nr_scans
);
577 * iscsi_unblock_session - set a session as logged in and start IO.
578 * @session: iscsi session
580 * Mark a session as ready to accept IO.
582 void iscsi_unblock_session(struct iscsi_cls_session
*session
)
584 queue_work(iscsi_eh_timer_workq
, &session
->unblock_work
);
586 * make sure all the events have completed before tell the driver
589 flush_workqueue(iscsi_eh_timer_workq
);
591 EXPORT_SYMBOL_GPL(iscsi_unblock_session
);
593 static void __iscsi_block_session(struct work_struct
*work
)
595 struct iscsi_cls_session
*session
=
596 container_of(work
, struct iscsi_cls_session
,
600 spin_lock_irqsave(&session
->lock
, flags
);
601 session
->state
= ISCSI_SESSION_FAILED
;
602 spin_unlock_irqrestore(&session
->lock
, flags
);
603 scsi_target_block(&session
->dev
);
604 queue_delayed_work(iscsi_eh_timer_workq
, &session
->recovery_work
,
605 session
->recovery_tmo
* HZ
);
608 void iscsi_block_session(struct iscsi_cls_session
*session
)
610 queue_work(iscsi_eh_timer_workq
, &session
->block_work
);
612 EXPORT_SYMBOL_GPL(iscsi_block_session
);
614 static void __iscsi_unbind_session(struct work_struct
*work
)
616 struct iscsi_cls_session
*session
=
617 container_of(work
, struct iscsi_cls_session
,
619 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
620 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
623 /* Prevent new scans and make sure scanning is not in progress */
624 mutex_lock(&ihost
->mutex
);
625 spin_lock_irqsave(&session
->lock
, flags
);
626 if (session
->target_id
== ISCSI_MAX_TARGET
) {
627 spin_unlock_irqrestore(&session
->lock
, flags
);
628 mutex_unlock(&ihost
->mutex
);
631 session
->target_id
= ISCSI_MAX_TARGET
;
632 spin_unlock_irqrestore(&session
->lock
, flags
);
633 mutex_unlock(&ihost
->mutex
);
635 scsi_remove_target(&session
->dev
);
636 iscsi_session_event(session
, ISCSI_KEVENT_UNBIND_SESSION
);
639 static int iscsi_unbind_session(struct iscsi_cls_session
*session
)
641 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
642 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
644 return queue_work(ihost
->scan_workq
, &session
->unbind_work
);
647 struct iscsi_cls_session
*
648 iscsi_alloc_session(struct Scsi_Host
*shost
, struct iscsi_transport
*transport
,
651 struct iscsi_cls_session
*session
;
653 session
= kzalloc(sizeof(*session
) + dd_size
,
658 session
->transport
= transport
;
659 session
->recovery_tmo
= 120;
660 session
->state
= ISCSI_SESSION_FREE
;
661 INIT_DELAYED_WORK(&session
->recovery_work
, session_recovery_timedout
);
662 INIT_LIST_HEAD(&session
->sess_list
);
663 INIT_WORK(&session
->unblock_work
, __iscsi_unblock_session
);
664 INIT_WORK(&session
->block_work
, __iscsi_block_session
);
665 INIT_WORK(&session
->unbind_work
, __iscsi_unbind_session
);
666 INIT_WORK(&session
->scan_work
, iscsi_scan_session
);
667 spin_lock_init(&session
->lock
);
669 /* this is released in the dev's release function */
670 scsi_host_get(shost
);
671 session
->dev
.parent
= &shost
->shost_gendev
;
672 session
->dev
.release
= iscsi_session_release
;
673 device_initialize(&session
->dev
);
675 session
->dd_data
= &session
[1];
678 EXPORT_SYMBOL_GPL(iscsi_alloc_session
);
680 static int iscsi_get_next_target_id(struct device
*dev
, void *data
)
682 struct iscsi_cls_session
*session
;
686 if (!iscsi_is_session_dev(dev
))
689 session
= iscsi_dev_to_session(dev
);
690 spin_lock_irqsave(&session
->lock
, flags
);
691 if (*((unsigned int *) data
) == session
->target_id
)
693 spin_unlock_irqrestore(&session
->lock
, flags
);
697 int iscsi_add_session(struct iscsi_cls_session
*session
, unsigned int target_id
)
699 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
700 struct iscsi_cls_host
*ihost
;
702 unsigned int id
= target_id
;
705 ihost
= shost
->shost_data
;
706 session
->sid
= atomic_add_return(1, &iscsi_session_nr
);
708 if (id
== ISCSI_MAX_TARGET
) {
709 for (id
= 0; id
< ISCSI_MAX_TARGET
; id
++) {
710 err
= device_for_each_child(&shost
->shost_gendev
, &id
,
711 iscsi_get_next_target_id
);
716 if (id
== ISCSI_MAX_TARGET
) {
717 iscsi_cls_session_printk(KERN_ERR
, session
,
718 "Too many iscsi targets. Max "
719 "number of targets is %d.\n",
720 ISCSI_MAX_TARGET
- 1);
724 session
->target_id
= id
;
726 dev_set_name(&session
->dev
, "session%u", session
->sid
);
727 err
= device_add(&session
->dev
);
729 iscsi_cls_session_printk(KERN_ERR
, session
,
730 "could not register session's dev\n");
733 transport_register_device(&session
->dev
);
735 spin_lock_irqsave(&sesslock
, flags
);
736 list_add(&session
->sess_list
, &sesslist
);
737 spin_unlock_irqrestore(&sesslock
, flags
);
739 iscsi_session_event(session
, ISCSI_KEVENT_CREATE_SESSION
);
743 scsi_host_put(shost
);
746 EXPORT_SYMBOL_GPL(iscsi_add_session
);
749 * iscsi_create_session - create iscsi class session
751 * @transport: iscsi transport
752 * @dd_size: private driver data size
753 * @target_id: which target
755 * This can be called from a LLD or iscsi_transport.
757 struct iscsi_cls_session
*
758 iscsi_create_session(struct Scsi_Host
*shost
, struct iscsi_transport
*transport
,
759 int dd_size
, unsigned int target_id
)
761 struct iscsi_cls_session
*session
;
763 session
= iscsi_alloc_session(shost
, transport
, dd_size
);
767 if (iscsi_add_session(session
, target_id
)) {
768 iscsi_free_session(session
);
773 EXPORT_SYMBOL_GPL(iscsi_create_session
);
775 static void iscsi_conn_release(struct device
*dev
)
777 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
778 struct device
*parent
= conn
->dev
.parent
;
784 static int iscsi_is_conn_dev(const struct device
*dev
)
786 return dev
->release
== iscsi_conn_release
;
789 static int iscsi_iter_destroy_conn_fn(struct device
*dev
, void *data
)
791 if (!iscsi_is_conn_dev(dev
))
793 return iscsi_destroy_conn(iscsi_dev_to_conn(dev
));
796 void iscsi_remove_session(struct iscsi_cls_session
*session
)
798 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
799 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
803 spin_lock_irqsave(&sesslock
, flags
);
804 list_del(&session
->sess_list
);
805 spin_unlock_irqrestore(&sesslock
, flags
);
807 /* make sure there are no blocks/unblocks queued */
808 flush_workqueue(iscsi_eh_timer_workq
);
809 /* make sure the timedout callout is not running */
810 if (!cancel_delayed_work(&session
->recovery_work
))
811 flush_workqueue(iscsi_eh_timer_workq
);
813 * If we are blocked let commands flow again. The lld or iscsi
814 * layer should set up the queuecommand to fail commands.
815 * We assume that LLD will not be calling block/unblock while
816 * removing the session.
818 spin_lock_irqsave(&session
->lock
, flags
);
819 session
->state
= ISCSI_SESSION_FREE
;
820 spin_unlock_irqrestore(&session
->lock
, flags
);
822 scsi_target_unblock(&session
->dev
);
823 /* flush running scans then delete devices */
824 flush_workqueue(ihost
->scan_workq
);
825 __iscsi_unbind_session(&session
->unbind_work
);
827 /* hw iscsi may not have removed all connections from session */
828 err
= device_for_each_child(&session
->dev
, NULL
,
829 iscsi_iter_destroy_conn_fn
);
831 iscsi_cls_session_printk(KERN_ERR
, session
,
832 "Could not delete all connections "
833 "for session. Error %d.\n", err
);
835 transport_unregister_device(&session
->dev
);
836 device_del(&session
->dev
);
838 EXPORT_SYMBOL_GPL(iscsi_remove_session
);
840 void iscsi_free_session(struct iscsi_cls_session
*session
)
842 iscsi_session_event(session
, ISCSI_KEVENT_DESTROY_SESSION
);
843 put_device(&session
->dev
);
845 EXPORT_SYMBOL_GPL(iscsi_free_session
);
848 * iscsi_destroy_session - destroy iscsi session
849 * @session: iscsi_session
851 * Can be called by a LLD or iscsi_transport. There must not be
852 * any running connections.
854 int iscsi_destroy_session(struct iscsi_cls_session
*session
)
856 iscsi_remove_session(session
);
857 iscsi_free_session(session
);
860 EXPORT_SYMBOL_GPL(iscsi_destroy_session
);
863 * iscsi_create_conn - create iscsi class connection
864 * @session: iscsi cls session
865 * @dd_size: private driver data size
866 * @cid: connection id
868 * This can be called from a LLD or iscsi_transport. The connection
869 * is child of the session so cid must be unique for all connections
872 * Since we do not support MCS, cid will normally be zero. In some cases
873 * for software iscsi we could be trying to preallocate a connection struct
874 * in which case there could be two connection structs and cid would be
877 struct iscsi_cls_conn
*
878 iscsi_create_conn(struct iscsi_cls_session
*session
, int dd_size
, uint32_t cid
)
880 struct iscsi_transport
*transport
= session
->transport
;
881 struct iscsi_cls_conn
*conn
;
885 conn
= kzalloc(sizeof(*conn
) + dd_size
, GFP_KERNEL
);
889 conn
->dd_data
= &conn
[1];
891 INIT_LIST_HEAD(&conn
->conn_list
);
892 conn
->transport
= transport
;
895 /* this is released in the dev's release function */
896 if (!get_device(&session
->dev
))
899 dev_set_name(&conn
->dev
, "connection%d:%u", session
->sid
, cid
);
900 conn
->dev
.parent
= &session
->dev
;
901 conn
->dev
.release
= iscsi_conn_release
;
902 err
= device_register(&conn
->dev
);
904 iscsi_cls_session_printk(KERN_ERR
, session
, "could not "
905 "register connection's dev\n");
906 goto release_parent_ref
;
908 transport_register_device(&conn
->dev
);
910 spin_lock_irqsave(&connlock
, flags
);
911 list_add(&conn
->conn_list
, &connlist
);
913 spin_unlock_irqrestore(&connlock
, flags
);
917 put_device(&session
->dev
);
923 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
926 * iscsi_destroy_conn - destroy iscsi class connection
927 * @conn: iscsi cls session
929 * This can be called from a LLD or iscsi_transport.
931 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
935 spin_lock_irqsave(&connlock
, flags
);
937 list_del(&conn
->conn_list
);
938 spin_unlock_irqrestore(&connlock
, flags
);
940 transport_unregister_device(&conn
->dev
);
941 device_unregister(&conn
->dev
);
944 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
947 * iscsi interface functions
949 static struct iscsi_internal
*
950 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
952 struct iscsi_internal
*priv
;
955 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
956 list_for_each_entry(priv
, &iscsi_transports
, list
) {
957 if (tt
== priv
->iscsi_transport
) {
958 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
962 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
967 iscsi_broadcast_skb(struct sk_buff
*skb
, gfp_t gfp
)
971 rc
= netlink_broadcast(nls
, skb
, 0, 1, gfp
);
973 printk(KERN_ERR
"iscsi: can not broadcast skb (%d)\n", rc
);
981 iscsi_unicast_skb(struct sk_buff
*skb
, int pid
)
985 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
987 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
994 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
995 char *data
, uint32_t data_size
)
997 struct nlmsghdr
*nlh
;
999 struct iscsi_uevent
*ev
;
1001 struct iscsi_internal
*priv
;
1002 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
1005 priv
= iscsi_if_transport_lookup(conn
->transport
);
1009 skb
= alloc_skb(len
, GFP_ATOMIC
);
1011 iscsi_conn_error_event(conn
, ISCSI_ERR_CONN_FAILED
);
1012 iscsi_cls_conn_printk(KERN_ERR
, conn
, "can not deliver "
1013 "control PDU: OOM\n");
1017 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
1018 ev
= NLMSG_DATA(nlh
);
1019 memset(ev
, 0, sizeof(*ev
));
1020 ev
->transport_handle
= iscsi_handle(conn
->transport
);
1021 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
1022 ev
->r
.recv_req
.cid
= conn
->cid
;
1023 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
1024 pdu
= (char*)ev
+ sizeof(*ev
);
1025 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
1026 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
1028 return iscsi_unicast_skb(skb
, priv
->daemon_pid
);
1030 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
1032 void iscsi_conn_error_event(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
1034 struct nlmsghdr
*nlh
;
1035 struct sk_buff
*skb
;
1036 struct iscsi_uevent
*ev
;
1037 struct iscsi_internal
*priv
;
1038 int len
= NLMSG_SPACE(sizeof(*ev
));
1040 priv
= iscsi_if_transport_lookup(conn
->transport
);
1044 skb
= alloc_skb(len
, GFP_ATOMIC
);
1046 iscsi_cls_conn_printk(KERN_ERR
, conn
, "gracefully ignored "
1047 "conn error (%d)\n", error
);
1051 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
1052 ev
= NLMSG_DATA(nlh
);
1053 ev
->transport_handle
= iscsi_handle(conn
->transport
);
1054 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
1055 ev
->r
.connerror
.error
= error
;
1056 ev
->r
.connerror
.cid
= conn
->cid
;
1057 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
1059 iscsi_broadcast_skb(skb
, GFP_ATOMIC
);
1061 iscsi_cls_conn_printk(KERN_INFO
, conn
, "detected conn error (%d)\n",
1064 EXPORT_SYMBOL_GPL(iscsi_conn_error_event
);
1067 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
1068 void *payload
, int size
)
1070 struct sk_buff
*skb
;
1071 struct nlmsghdr
*nlh
;
1072 int len
= NLMSG_SPACE(size
);
1073 int flags
= multi
? NLM_F_MULTI
: 0;
1074 int t
= done
? NLMSG_DONE
: type
;
1076 skb
= alloc_skb(len
, GFP_ATOMIC
);
1078 printk(KERN_ERR
"Could not allocate skb to send reply.\n");
1082 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
1083 nlh
->nlmsg_flags
= flags
;
1084 memcpy(NLMSG_DATA(nlh
), payload
, size
);
1085 return iscsi_unicast_skb(skb
, pid
);
1089 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
1091 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1092 struct iscsi_stats
*stats
;
1093 struct sk_buff
*skbstat
;
1094 struct iscsi_cls_conn
*conn
;
1095 struct nlmsghdr
*nlhstat
;
1096 struct iscsi_uevent
*evstat
;
1097 struct iscsi_internal
*priv
;
1098 int len
= NLMSG_SPACE(sizeof(*ev
) +
1099 sizeof(struct iscsi_stats
) +
1100 sizeof(struct iscsi_stats_custom
) *
1101 ISCSI_STATS_CUSTOM_MAX
);
1104 priv
= iscsi_if_transport_lookup(transport
);
1108 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
1115 skbstat
= alloc_skb(len
, GFP_ATOMIC
);
1117 iscsi_cls_conn_printk(KERN_ERR
, conn
, "can not "
1118 "deliver stats: OOM\n");
1122 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
1123 (len
- sizeof(*nlhstat
)), 0);
1124 evstat
= NLMSG_DATA(nlhstat
);
1125 memset(evstat
, 0, sizeof(*evstat
));
1126 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
1127 evstat
->type
= nlh
->nlmsg_type
;
1128 evstat
->u
.get_stats
.cid
=
1129 ev
->u
.get_stats
.cid
;
1130 evstat
->u
.get_stats
.sid
=
1131 ev
->u
.get_stats
.sid
;
1132 stats
= (struct iscsi_stats
*)
1133 ((char*)evstat
+ sizeof(*evstat
));
1134 memset(stats
, 0, sizeof(*stats
));
1136 transport
->get_stats(conn
, stats
);
1137 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
1138 sizeof(struct iscsi_stats
) +
1139 sizeof(struct iscsi_stats_custom
) *
1140 stats
->custom_length
);
1141 actual_size
-= sizeof(*nlhstat
);
1142 actual_size
= NLMSG_LENGTH(actual_size
);
1143 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
1144 nlhstat
->nlmsg_len
= actual_size
;
1146 err
= iscsi_unicast_skb(skbstat
, priv
->daemon_pid
);
1147 } while (err
< 0 && err
!= -ECONNREFUSED
);
1153 * iscsi_session_event - send session destr. completion event
1154 * @session: iscsi class session
1155 * @event: type of event
1157 int iscsi_session_event(struct iscsi_cls_session
*session
,
1158 enum iscsi_uevent_e event
)
1160 struct iscsi_internal
*priv
;
1161 struct Scsi_Host
*shost
;
1162 struct iscsi_uevent
*ev
;
1163 struct sk_buff
*skb
;
1164 struct nlmsghdr
*nlh
;
1165 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
1167 priv
= iscsi_if_transport_lookup(session
->transport
);
1170 shost
= iscsi_session_to_shost(session
);
1172 skb
= alloc_skb(len
, GFP_KERNEL
);
1174 iscsi_cls_session_printk(KERN_ERR
, session
,
1175 "Cannot notify userspace of session "
1176 "event %u\n", event
);
1180 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
1181 ev
= NLMSG_DATA(nlh
);
1182 ev
->transport_handle
= iscsi_handle(session
->transport
);
1186 case ISCSI_KEVENT_DESTROY_SESSION
:
1187 ev
->r
.d_session
.host_no
= shost
->host_no
;
1188 ev
->r
.d_session
.sid
= session
->sid
;
1190 case ISCSI_KEVENT_CREATE_SESSION
:
1191 ev
->r
.c_session_ret
.host_no
= shost
->host_no
;
1192 ev
->r
.c_session_ret
.sid
= session
->sid
;
1194 case ISCSI_KEVENT_UNBIND_SESSION
:
1195 ev
->r
.unbind_session
.host_no
= shost
->host_no
;
1196 ev
->r
.unbind_session
.sid
= session
->sid
;
1199 iscsi_cls_session_printk(KERN_ERR
, session
, "Invalid event "
1206 * this will occur if the daemon is not up, so we just warn
1207 * the user and when the daemon is restarted it will handle it
1209 rc
= iscsi_broadcast_skb(skb
, GFP_KERNEL
);
1211 iscsi_cls_session_printk(KERN_ERR
, session
,
1212 "Cannot notify userspace of session "
1213 "event %u. Check iscsi daemon\n",
1217 EXPORT_SYMBOL_GPL(iscsi_session_event
);
1220 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_endpoint
*ep
,
1221 struct iscsi_uevent
*ev
, uint32_t initial_cmdsn
,
1222 uint16_t cmds_max
, uint16_t queue_depth
)
1224 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
1225 struct iscsi_cls_session
*session
;
1228 session
= transport
->create_session(ep
, cmds_max
, queue_depth
,
1229 initial_cmdsn
, &host_no
);
1233 ev
->r
.c_session_ret
.host_no
= host_no
;
1234 ev
->r
.c_session_ret
.sid
= session
->sid
;
1239 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1241 struct iscsi_cls_conn
*conn
;
1242 struct iscsi_cls_session
*session
;
1244 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
1246 printk(KERN_ERR
"iscsi: invalid session %d.\n",
1251 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
1253 iscsi_cls_session_printk(KERN_ERR
, session
,
1254 "couldn't create a new connection.");
1258 ev
->r
.c_conn_ret
.sid
= session
->sid
;
1259 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
1264 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1266 struct iscsi_cls_conn
*conn
;
1268 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
1272 if (transport
->destroy_conn
)
1273 transport
->destroy_conn(conn
);
1278 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1280 char *data
= (char*)ev
+ sizeof(*ev
);
1281 struct iscsi_cls_conn
*conn
;
1282 struct iscsi_cls_session
*session
;
1283 int err
= 0, value
= 0;
1285 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
1286 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
1287 if (!conn
|| !session
)
1290 switch (ev
->u
.set_param
.param
) {
1291 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
1292 sscanf(data
, "%d", &value
);
1294 session
->recovery_tmo
= value
;
1297 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
,
1298 data
, ev
->u
.set_param
.len
);
1305 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
1306 struct iscsi_uevent
*ev
, int msg_type
)
1308 struct iscsi_endpoint
*ep
;
1309 struct sockaddr
*dst_addr
;
1313 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1314 if (!transport
->ep_connect
)
1317 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1318 ep
= transport
->ep_connect(dst_addr
,
1319 ev
->u
.ep_connect
.non_blocking
);
1323 ev
->r
.ep_connect_ret
.handle
= ep
->id
;
1325 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1326 if (!transport
->ep_poll
)
1329 ep
= iscsi_lookup_endpoint(ev
->u
.ep_poll
.ep_handle
);
1333 ev
->r
.retcode
= transport
->ep_poll(ep
,
1334 ev
->u
.ep_poll
.timeout_ms
);
1336 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1337 if (!transport
->ep_disconnect
)
1340 ep
= iscsi_lookup_endpoint(ev
->u
.ep_disconnect
.ep_handle
);
1344 transport
->ep_disconnect(ep
);
1351 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
1352 struct iscsi_uevent
*ev
)
1354 struct Scsi_Host
*shost
;
1355 struct sockaddr
*dst_addr
;
1358 if (!transport
->tgt_dscvr
)
1361 shost
= scsi_host_lookup(ev
->u
.tgt_dscvr
.host_no
);
1363 printk(KERN_ERR
"target discovery could not find host no %u\n",
1364 ev
->u
.tgt_dscvr
.host_no
);
1369 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1370 err
= transport
->tgt_dscvr(shost
, ev
->u
.tgt_dscvr
.type
,
1371 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
1372 scsi_host_put(shost
);
1377 iscsi_set_host_param(struct iscsi_transport
*transport
,
1378 struct iscsi_uevent
*ev
)
1380 char *data
= (char*)ev
+ sizeof(*ev
);
1381 struct Scsi_Host
*shost
;
1384 if (!transport
->set_host_param
)
1387 shost
= scsi_host_lookup(ev
->u
.set_host_param
.host_no
);
1389 printk(KERN_ERR
"set_host_param could not find host no %u\n",
1390 ev
->u
.set_host_param
.host_no
);
1394 err
= transport
->set_host_param(shost
, ev
->u
.set_host_param
.param
,
1395 data
, ev
->u
.set_host_param
.len
);
1396 scsi_host_put(shost
);
1401 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
1404 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1405 struct iscsi_transport
*transport
= NULL
;
1406 struct iscsi_internal
*priv
;
1407 struct iscsi_cls_session
*session
;
1408 struct iscsi_cls_conn
*conn
;
1409 struct iscsi_endpoint
*ep
= NULL
;
1411 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
1414 transport
= priv
->iscsi_transport
;
1416 if (!try_module_get(transport
->owner
))
1419 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1421 switch (nlh
->nlmsg_type
) {
1422 case ISCSI_UEVENT_CREATE_SESSION
:
1423 err
= iscsi_if_create_session(priv
, ep
, ev
,
1424 ev
->u
.c_session
.initial_cmdsn
,
1425 ev
->u
.c_session
.cmds_max
,
1426 ev
->u
.c_session
.queue_depth
);
1428 case ISCSI_UEVENT_CREATE_BOUND_SESSION
:
1429 ep
= iscsi_lookup_endpoint(ev
->u
.c_bound_session
.ep_handle
);
1435 err
= iscsi_if_create_session(priv
, ep
, ev
,
1436 ev
->u
.c_bound_session
.initial_cmdsn
,
1437 ev
->u
.c_bound_session
.cmds_max
,
1438 ev
->u
.c_bound_session
.queue_depth
);
1440 case ISCSI_UEVENT_DESTROY_SESSION
:
1441 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1443 transport
->destroy_session(session
);
1447 case ISCSI_UEVENT_UNBIND_SESSION
:
1448 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1450 iscsi_unbind_session(session
);
1454 case ISCSI_UEVENT_CREATE_CONN
:
1455 err
= iscsi_if_create_conn(transport
, ev
);
1457 case ISCSI_UEVENT_DESTROY_CONN
:
1458 err
= iscsi_if_destroy_conn(transport
, ev
);
1460 case ISCSI_UEVENT_BIND_CONN
:
1461 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1462 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1464 if (session
&& conn
)
1465 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1466 ev
->u
.b_conn
.transport_eph
,
1467 ev
->u
.b_conn
.is_leading
);
1471 case ISCSI_UEVENT_SET_PARAM
:
1472 err
= iscsi_set_param(transport
, ev
);
1474 case ISCSI_UEVENT_START_CONN
:
1475 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1477 ev
->r
.retcode
= transport
->start_conn(conn
);
1481 case ISCSI_UEVENT_STOP_CONN
:
1482 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1484 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1488 case ISCSI_UEVENT_SEND_PDU
:
1489 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1491 ev
->r
.retcode
= transport
->send_pdu(conn
,
1492 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1493 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1494 ev
->u
.send_pdu
.data_size
);
1498 case ISCSI_UEVENT_GET_STATS
:
1499 err
= iscsi_if_get_stats(transport
, nlh
);
1501 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1502 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1503 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1504 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1506 case ISCSI_UEVENT_TGT_DSCVR
:
1507 err
= iscsi_tgt_dscvr(transport
, ev
);
1509 case ISCSI_UEVENT_SET_HOST_PARAM
:
1510 err
= iscsi_set_host_param(transport
, ev
);
1517 module_put(transport
->owner
);
1522 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1523 * Malformed skbs with wrong lengths or invalid creds are not processed.
1526 iscsi_if_rx(struct sk_buff
*skb
)
1528 mutex_lock(&rx_queue_mutex
);
1529 while (skb
->len
>= NLMSG_SPACE(0)) {
1532 struct nlmsghdr
*nlh
;
1533 struct iscsi_uevent
*ev
;
1535 nlh
= nlmsg_hdr(skb
);
1536 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1537 skb
->len
< nlh
->nlmsg_len
) {
1541 ev
= NLMSG_DATA(nlh
);
1542 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1543 if (rlen
> skb
->len
)
1546 err
= iscsi_if_recv_msg(skb
, nlh
);
1548 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1553 * special case for GET_STATS:
1554 * on success - sending reply and stats from
1555 * inside of if_recv_msg(),
1556 * on error - fall through.
1558 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1560 err
= iscsi_if_send_reply(
1561 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1562 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1563 } while (err
< 0 && err
!= -ECONNREFUSED
);
1564 skb_pull(skb
, rlen
);
1566 mutex_unlock(&rx_queue_mutex
);
1569 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1570 struct device_attribute dev_attr_##_prefix##_##_name = \
1571 __ATTR(_name,_mode,_show,_store)
1574 * iSCSI connection attrs
1576 #define iscsi_conn_attr_show(param) \
1578 show_conn_param_##param(struct device *dev, \
1579 struct device_attribute *attr, char *buf) \
1581 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1582 struct iscsi_transport *t = conn->transport; \
1583 return t->get_conn_param(conn, param, buf); \
1586 #define iscsi_conn_attr(field, param) \
1587 iscsi_conn_attr_show(param) \
1588 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1591 iscsi_conn_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
);
1592 iscsi_conn_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
);
1593 iscsi_conn_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
);
1594 iscsi_conn_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
);
1595 iscsi_conn_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
);
1596 iscsi_conn_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
);
1597 iscsi_conn_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
);
1598 iscsi_conn_attr(port
, ISCSI_PARAM_CONN_PORT
);
1599 iscsi_conn_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
);
1600 iscsi_conn_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1601 iscsi_conn_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1602 iscsi_conn_attr(ping_tmo
, ISCSI_PARAM_PING_TMO
);
1603 iscsi_conn_attr(recv_tmo
, ISCSI_PARAM_RECV_TMO
);
1606 * iSCSI session attrs
1608 #define iscsi_session_attr_show(param, perm) \
1610 show_session_param_##param(struct device *dev, \
1611 struct device_attribute *attr, char *buf) \
1613 struct iscsi_cls_session *session = \
1614 iscsi_dev_to_session(dev->parent); \
1615 struct iscsi_transport *t = session->transport; \
1617 if (perm && !capable(CAP_SYS_ADMIN)) \
1619 return t->get_session_param(session, param, buf); \
1622 #define iscsi_session_attr(field, param, perm) \
1623 iscsi_session_attr_show(param, perm) \
1624 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1627 iscsi_session_attr(targetname
, ISCSI_PARAM_TARGET_NAME
, 0);
1628 iscsi_session_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
, 0);
1629 iscsi_session_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
, 0);
1630 iscsi_session_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
, 0);
1631 iscsi_session_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
, 0);
1632 iscsi_session_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
, 0);
1633 iscsi_session_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
, 0);
1634 iscsi_session_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
, 0);
1635 iscsi_session_attr(erl
, ISCSI_PARAM_ERL
, 0);
1636 iscsi_session_attr(tpgt
, ISCSI_PARAM_TPGT
, 0);
1637 iscsi_session_attr(username
, ISCSI_PARAM_USERNAME
, 1);
1638 iscsi_session_attr(username_in
, ISCSI_PARAM_USERNAME_IN
, 1);
1639 iscsi_session_attr(password
, ISCSI_PARAM_PASSWORD
, 1);
1640 iscsi_session_attr(password_in
, ISCSI_PARAM_PASSWORD_IN
, 1);
1641 iscsi_session_attr(fast_abort
, ISCSI_PARAM_FAST_ABORT
, 0);
1642 iscsi_session_attr(abort_tmo
, ISCSI_PARAM_ABORT_TMO
, 0);
1643 iscsi_session_attr(lu_reset_tmo
, ISCSI_PARAM_LU_RESET_TMO
, 0);
1644 iscsi_session_attr(ifacename
, ISCSI_PARAM_IFACE_NAME
, 0);
1645 iscsi_session_attr(initiatorname
, ISCSI_PARAM_INITIATOR_NAME
, 0)
1648 show_priv_session_state(struct device
*dev
, struct device_attribute
*attr
,
1651 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
->parent
);
1652 return sprintf(buf
, "%s\n", iscsi_session_state_name(session
->state
));
1654 static ISCSI_CLASS_ATTR(priv_sess
, state
, S_IRUGO
, show_priv_session_state
,
1657 #define iscsi_priv_session_attr_show(field, format) \
1659 show_priv_session_##field(struct device *dev, \
1660 struct device_attribute *attr, char *buf) \
1662 struct iscsi_cls_session *session = \
1663 iscsi_dev_to_session(dev->parent); \
1664 return sprintf(buf, format"\n", session->field); \
1667 #define iscsi_priv_session_attr(field, format) \
1668 iscsi_priv_session_attr_show(field, format) \
1669 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1671 iscsi_priv_session_attr(recovery_tmo
, "%d");
1676 #define iscsi_host_attr_show(param) \
1678 show_host_param_##param(struct device *dev, \
1679 struct device_attribute *attr, char *buf) \
1681 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1682 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1683 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1686 #define iscsi_host_attr(field, param) \
1687 iscsi_host_attr_show(param) \
1688 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1691 iscsi_host_attr(netdev
, ISCSI_HOST_PARAM_NETDEV_NAME
);
1692 iscsi_host_attr(hwaddress
, ISCSI_HOST_PARAM_HWADDRESS
);
1693 iscsi_host_attr(ipaddress
, ISCSI_HOST_PARAM_IPADDRESS
);
1694 iscsi_host_attr(initiatorname
, ISCSI_HOST_PARAM_INITIATOR_NAME
);
1696 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1698 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1703 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1705 if (tt->param_mask & param_flag) { \
1706 priv->session_attrs[count] = &dev_attr_sess_##field; \
1711 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1713 if (tt->param_mask & param_flag) { \
1714 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1719 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1721 if (tt->host_param_mask & param_flag) { \
1722 priv->host_attrs[count] = &dev_attr_host_##field; \
1727 static int iscsi_session_match(struct attribute_container
*cont
,
1730 struct iscsi_cls_session
*session
;
1731 struct Scsi_Host
*shost
;
1732 struct iscsi_internal
*priv
;
1734 if (!iscsi_is_session_dev(dev
))
1737 session
= iscsi_dev_to_session(dev
);
1738 shost
= iscsi_session_to_shost(session
);
1739 if (!shost
->transportt
)
1742 priv
= to_iscsi_internal(shost
->transportt
);
1743 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1746 return &priv
->session_cont
.ac
== cont
;
1749 static int iscsi_conn_match(struct attribute_container
*cont
,
1752 struct iscsi_cls_session
*session
;
1753 struct iscsi_cls_conn
*conn
;
1754 struct Scsi_Host
*shost
;
1755 struct iscsi_internal
*priv
;
1757 if (!iscsi_is_conn_dev(dev
))
1760 conn
= iscsi_dev_to_conn(dev
);
1761 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1762 shost
= iscsi_session_to_shost(session
);
1764 if (!shost
->transportt
)
1767 priv
= to_iscsi_internal(shost
->transportt
);
1768 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1771 return &priv
->conn_cont
.ac
== cont
;
1774 static int iscsi_host_match(struct attribute_container
*cont
,
1777 struct Scsi_Host
*shost
;
1778 struct iscsi_internal
*priv
;
1780 if (!scsi_is_host_device(dev
))
1783 shost
= dev_to_shost(dev
);
1784 if (!shost
->transportt
||
1785 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1788 priv
= to_iscsi_internal(shost
->transportt
);
1789 return &priv
->t
.host_attrs
.ac
== cont
;
1792 struct scsi_transport_template
*
1793 iscsi_register_transport(struct iscsi_transport
*tt
)
1795 struct iscsi_internal
*priv
;
1796 unsigned long flags
;
1801 priv
= iscsi_if_transport_lookup(tt
);
1805 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1808 INIT_LIST_HEAD(&priv
->list
);
1809 priv
->daemon_pid
= -1;
1810 priv
->iscsi_transport
= tt
;
1811 priv
->t
.user_scan
= iscsi_user_scan
;
1812 if (!(tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1813 priv
->t
.create_work_queue
= 1;
1815 priv
->dev
.class = &iscsi_transport_class
;
1816 dev_set_name(&priv
->dev
, "%s", tt
->name
);
1817 err
= device_register(&priv
->dev
);
1821 err
= sysfs_create_group(&priv
->dev
.kobj
, &iscsi_transport_group
);
1823 goto unregister_dev
;
1825 /* host parameters */
1826 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1827 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1828 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1829 priv
->t
.host_size
= sizeof(struct iscsi_cls_host
);
1830 transport_container_register(&priv
->t
.host_attrs
);
1832 SETUP_HOST_RD_ATTR(netdev
, ISCSI_HOST_NETDEV_NAME
);
1833 SETUP_HOST_RD_ATTR(ipaddress
, ISCSI_HOST_IPADDRESS
);
1834 SETUP_HOST_RD_ATTR(hwaddress
, ISCSI_HOST_HWADDRESS
);
1835 SETUP_HOST_RD_ATTR(initiatorname
, ISCSI_HOST_INITIATOR_NAME
);
1836 BUG_ON(count
> ISCSI_HOST_ATTRS
);
1837 priv
->host_attrs
[count
] = NULL
;
1840 /* connection parameters */
1841 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1842 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1843 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1844 transport_container_register(&priv
->conn_cont
);
1846 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1847 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1848 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1849 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1850 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1851 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1852 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1853 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1854 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1855 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1856 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1857 SETUP_CONN_RD_ATTR(ping_tmo
, ISCSI_PING_TMO
);
1858 SETUP_CONN_RD_ATTR(recv_tmo
, ISCSI_RECV_TMO
);
1860 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1861 priv
->conn_attrs
[count
] = NULL
;
1864 /* session parameters */
1865 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1866 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1867 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1868 transport_container_register(&priv
->session_cont
);
1870 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1871 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1872 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1873 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1874 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1875 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1876 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1877 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1878 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1879 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1880 SETUP_SESSION_RD_ATTR(password
, ISCSI_USERNAME
);
1881 SETUP_SESSION_RD_ATTR(password_in
, ISCSI_USERNAME_IN
);
1882 SETUP_SESSION_RD_ATTR(username
, ISCSI_PASSWORD
);
1883 SETUP_SESSION_RD_ATTR(username_in
, ISCSI_PASSWORD_IN
);
1884 SETUP_SESSION_RD_ATTR(fast_abort
, ISCSI_FAST_ABORT
);
1885 SETUP_SESSION_RD_ATTR(abort_tmo
, ISCSI_ABORT_TMO
);
1886 SETUP_SESSION_RD_ATTR(lu_reset_tmo
,ISCSI_LU_RESET_TMO
);
1887 SETUP_SESSION_RD_ATTR(ifacename
, ISCSI_IFACE_NAME
);
1888 SETUP_SESSION_RD_ATTR(initiatorname
, ISCSI_INITIATOR_NAME
);
1889 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1890 SETUP_PRIV_SESSION_RD_ATTR(state
);
1892 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1893 priv
->session_attrs
[count
] = NULL
;
1895 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1896 list_add(&priv
->list
, &iscsi_transports
);
1897 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1899 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1903 device_unregister(&priv
->dev
);
1909 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1911 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1913 struct iscsi_internal
*priv
;
1914 unsigned long flags
;
1918 mutex_lock(&rx_queue_mutex
);
1920 priv
= iscsi_if_transport_lookup(tt
);
1923 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1924 list_del(&priv
->list
);
1925 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1927 transport_container_unregister(&priv
->conn_cont
);
1928 transport_container_unregister(&priv
->session_cont
);
1929 transport_container_unregister(&priv
->t
.host_attrs
);
1931 sysfs_remove_group(&priv
->dev
.kobj
, &iscsi_transport_group
);
1932 device_unregister(&priv
->dev
);
1933 mutex_unlock(&rx_queue_mutex
);
1937 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1939 static __init
int iscsi_transport_init(void)
1943 printk(KERN_INFO
"Loading iSCSI transport class v%s.\n",
1944 ISCSI_TRANSPORT_VERSION
);
1946 atomic_set(&iscsi_session_nr
, 0);
1948 err
= class_register(&iscsi_transport_class
);
1952 err
= class_register(&iscsi_endpoint_class
);
1954 goto unregister_transport_class
;
1956 err
= transport_class_register(&iscsi_host_class
);
1958 goto unregister_endpoint_class
;
1960 err
= transport_class_register(&iscsi_connection_class
);
1962 goto unregister_host_class
;
1964 err
= transport_class_register(&iscsi_session_class
);
1966 goto unregister_conn_class
;
1968 nls
= netlink_kernel_create(&init_net
, NETLINK_ISCSI
, 1, iscsi_if_rx
,
1972 goto unregister_session_class
;
1975 iscsi_eh_timer_workq
= create_singlethread_workqueue("iscsi_eh");
1976 if (!iscsi_eh_timer_workq
)
1982 netlink_kernel_release(nls
);
1983 unregister_session_class
:
1984 transport_class_unregister(&iscsi_session_class
);
1985 unregister_conn_class
:
1986 transport_class_unregister(&iscsi_connection_class
);
1987 unregister_host_class
:
1988 transport_class_unregister(&iscsi_host_class
);
1989 unregister_endpoint_class
:
1990 class_unregister(&iscsi_endpoint_class
);
1991 unregister_transport_class
:
1992 class_unregister(&iscsi_transport_class
);
1996 static void __exit
iscsi_transport_exit(void)
1998 destroy_workqueue(iscsi_eh_timer_workq
);
1999 netlink_kernel_release(nls
);
2000 transport_class_unregister(&iscsi_connection_class
);
2001 transport_class_unregister(&iscsi_session_class
);
2002 transport_class_unregister(&iscsi_host_class
);
2003 class_unregister(&iscsi_endpoint_class
);
2004 class_unregister(&iscsi_transport_class
);
2007 module_init(iscsi_transport_init
);
2008 module_exit(iscsi_transport_exit
);
2010 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2011 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2012 "Alex Aizman <itn780@yahoo.com>");
2013 MODULE_DESCRIPTION("iSCSI Transport Interface");
2014 MODULE_LICENSE("GPL");
2015 MODULE_VERSION(ISCSI_TRANSPORT_VERSION
);