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
, "%u\n", 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 unsigned int *epid
= (unsigned int *) 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
, &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 snprintf(ep
->dev
.bus_id
, BUS_ID_SIZE
, "ep-%u", 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
)
224 dev
= class_find_device(&iscsi_endpoint_class
, &handle
,
229 return iscsi_dev_to_endpoint(dev
);
231 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint
);
233 static int iscsi_setup_host(struct transport_container
*tc
, struct device
*dev
,
236 struct Scsi_Host
*shost
= dev_to_shost(dev
);
237 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
239 memset(ihost
, 0, sizeof(*ihost
));
240 atomic_set(&ihost
->nr_scans
, 0);
241 mutex_init(&ihost
->mutex
);
243 snprintf(ihost
->scan_workq_name
, KOBJ_NAME_LEN
, "iscsi_scan_%d",
245 ihost
->scan_workq
= create_singlethread_workqueue(
246 ihost
->scan_workq_name
);
247 if (!ihost
->scan_workq
)
252 static int iscsi_remove_host(struct transport_container
*tc
, struct device
*dev
,
255 struct Scsi_Host
*shost
= dev_to_shost(dev
);
256 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
258 destroy_workqueue(ihost
->scan_workq
);
262 static DECLARE_TRANSPORT_CLASS(iscsi_host_class
,
268 static DECLARE_TRANSPORT_CLASS(iscsi_session_class
,
274 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class
,
280 static struct sock
*nls
;
281 static DEFINE_MUTEX(rx_queue_mutex
);
283 static LIST_HEAD(sesslist
);
284 static DEFINE_SPINLOCK(sesslock
);
285 static LIST_HEAD(connlist
);
286 static DEFINE_SPINLOCK(connlock
);
288 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn
*conn
)
290 struct iscsi_cls_session
*sess
= iscsi_dev_to_session(conn
->dev
.parent
);
295 * Returns the matching session to a given sid
297 static struct iscsi_cls_session
*iscsi_session_lookup(uint32_t sid
)
300 struct iscsi_cls_session
*sess
;
302 spin_lock_irqsave(&sesslock
, flags
);
303 list_for_each_entry(sess
, &sesslist
, sess_list
) {
304 if (sess
->sid
== sid
) {
305 spin_unlock_irqrestore(&sesslock
, flags
);
309 spin_unlock_irqrestore(&sesslock
, flags
);
314 * Returns the matching connection to a given sid / cid tuple
316 static struct iscsi_cls_conn
*iscsi_conn_lookup(uint32_t sid
, uint32_t cid
)
319 struct iscsi_cls_conn
*conn
;
321 spin_lock_irqsave(&connlock
, flags
);
322 list_for_each_entry(conn
, &connlist
, conn_list
) {
323 if ((conn
->cid
== cid
) && (iscsi_conn_get_sid(conn
) == sid
)) {
324 spin_unlock_irqrestore(&connlock
, flags
);
328 spin_unlock_irqrestore(&connlock
, flags
);
333 * The following functions can be used by LLDs that allocate
334 * their own scsi_hosts or by software iscsi LLDs
339 } iscsi_session_state_names
[] = {
340 { ISCSI_SESSION_LOGGED_IN
, "LOGGED_IN" },
341 { ISCSI_SESSION_FAILED
, "FAILED" },
342 { ISCSI_SESSION_FREE
, "FREE" },
345 static const char *iscsi_session_state_name(int state
)
350 for (i
= 0; i
< ARRAY_SIZE(iscsi_session_state_names
); i
++) {
351 if (iscsi_session_state_names
[i
].value
== state
) {
352 name
= iscsi_session_state_names
[i
].name
;
359 int iscsi_session_chkready(struct iscsi_cls_session
*session
)
364 spin_lock_irqsave(&session
->lock
, flags
);
365 switch (session
->state
) {
366 case ISCSI_SESSION_LOGGED_IN
:
369 case ISCSI_SESSION_FAILED
:
370 err
= DID_IMM_RETRY
<< 16;
372 case ISCSI_SESSION_FREE
:
373 err
= DID_NO_CONNECT
<< 16;
376 err
= DID_NO_CONNECT
<< 16;
379 spin_unlock_irqrestore(&session
->lock
, flags
);
382 EXPORT_SYMBOL_GPL(iscsi_session_chkready
);
384 static void iscsi_session_release(struct device
*dev
)
386 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
);
387 struct Scsi_Host
*shost
;
389 shost
= iscsi_session_to_shost(session
);
390 scsi_host_put(shost
);
394 static int iscsi_is_session_dev(const struct device
*dev
)
396 return dev
->release
== iscsi_session_release
;
399 static int iscsi_iter_session_fn(struct device
*dev
, void *data
)
401 void (* fn
) (struct iscsi_cls_session
*) = data
;
403 if (!iscsi_is_session_dev(dev
))
405 fn(iscsi_dev_to_session(dev
));
409 void iscsi_host_for_each_session(struct Scsi_Host
*shost
,
410 void (*fn
)(struct iscsi_cls_session
*))
412 device_for_each_child(&shost
->shost_gendev
, fn
,
413 iscsi_iter_session_fn
);
415 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session
);
418 * iscsi_scan_finished - helper to report when running scans are done
420 * @time: scan run time
422 * This function can be used by drives like qla4xxx to report to the scsi
423 * layer when the scans it kicked off at module load time are done.
425 int iscsi_scan_finished(struct Scsi_Host
*shost
, unsigned long time
)
427 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
429 * qla4xxx will have kicked off some session unblocks before calling
430 * scsi_scan_host, so just wait for them to complete.
432 return !atomic_read(&ihost
->nr_scans
);
434 EXPORT_SYMBOL_GPL(iscsi_scan_finished
);
436 struct iscsi_scan_data
{
437 unsigned int channel
;
442 static int iscsi_user_scan_session(struct device
*dev
, void *data
)
444 struct iscsi_scan_data
*scan_data
= data
;
445 struct iscsi_cls_session
*session
;
446 struct Scsi_Host
*shost
;
447 struct iscsi_cls_host
*ihost
;
451 if (!iscsi_is_session_dev(dev
))
454 session
= iscsi_dev_to_session(dev
);
455 shost
= iscsi_session_to_shost(session
);
456 ihost
= shost
->shost_data
;
458 mutex_lock(&ihost
->mutex
);
459 spin_lock_irqsave(&session
->lock
, flags
);
460 if (session
->state
!= ISCSI_SESSION_LOGGED_IN
) {
461 spin_unlock_irqrestore(&session
->lock
, flags
);
462 mutex_unlock(&ihost
->mutex
);
465 id
= session
->target_id
;
466 spin_unlock_irqrestore(&session
->lock
, flags
);
468 if (id
!= ISCSI_MAX_TARGET
) {
469 if ((scan_data
->channel
== SCAN_WILD_CARD
||
470 scan_data
->channel
== 0) &&
471 (scan_data
->id
== SCAN_WILD_CARD
||
472 scan_data
->id
== id
))
473 scsi_scan_target(&session
->dev
, 0, id
,
476 mutex_unlock(&ihost
->mutex
);
480 static int iscsi_user_scan(struct Scsi_Host
*shost
, uint channel
,
483 struct iscsi_scan_data scan_data
;
485 scan_data
.channel
= channel
;
489 return device_for_each_child(&shost
->shost_gendev
, &scan_data
,
490 iscsi_user_scan_session
);
493 static void iscsi_scan_session(struct work_struct
*work
)
495 struct iscsi_cls_session
*session
=
496 container_of(work
, struct iscsi_cls_session
, scan_work
);
497 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
498 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
499 struct iscsi_scan_data scan_data
;
501 scan_data
.channel
= 0;
502 scan_data
.id
= SCAN_WILD_CARD
;
503 scan_data
.lun
= SCAN_WILD_CARD
;
505 iscsi_user_scan_session(&session
->dev
, &scan_data
);
506 atomic_dec(&ihost
->nr_scans
);
509 static void session_recovery_timedout(struct work_struct
*work
)
511 struct iscsi_cls_session
*session
=
512 container_of(work
, struct iscsi_cls_session
,
516 iscsi_cls_session_printk(KERN_INFO
, session
,
517 "session recovery timed out after %d secs\n",
518 session
->recovery_tmo
);
520 spin_lock_irqsave(&session
->lock
, flags
);
521 switch (session
->state
) {
522 case ISCSI_SESSION_FAILED
:
523 session
->state
= ISCSI_SESSION_FREE
;
525 case ISCSI_SESSION_LOGGED_IN
:
526 case ISCSI_SESSION_FREE
:
527 /* we raced with the unblock's flush */
528 spin_unlock_irqrestore(&session
->lock
, flags
);
531 spin_unlock_irqrestore(&session
->lock
, flags
);
533 if (session
->transport
->session_recovery_timedout
)
534 session
->transport
->session_recovery_timedout(session
);
536 scsi_target_unblock(&session
->dev
);
539 static void __iscsi_unblock_session(struct work_struct
*work
)
541 struct iscsi_cls_session
*session
=
542 container_of(work
, struct iscsi_cls_session
,
544 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
545 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
549 * The recovery and unblock work get run from the same workqueue,
550 * so try to cancel it if it was going to run after this unblock.
552 cancel_delayed_work(&session
->recovery_work
);
553 spin_lock_irqsave(&session
->lock
, flags
);
554 session
->state
= ISCSI_SESSION_LOGGED_IN
;
555 spin_unlock_irqrestore(&session
->lock
, flags
);
557 scsi_target_unblock(&session
->dev
);
559 * Only do kernel scanning if the driver is properly hooked into
560 * the async scanning code (drivers like iscsi_tcp do login and
561 * scanning from userspace).
563 if (shost
->hostt
->scan_finished
) {
564 if (queue_work(ihost
->scan_workq
, &session
->scan_work
))
565 atomic_inc(&ihost
->nr_scans
);
570 * iscsi_unblock_session - set a session as logged in and start IO.
571 * @session: iscsi session
573 * Mark a session as ready to accept IO.
575 void iscsi_unblock_session(struct iscsi_cls_session
*session
)
577 queue_work(iscsi_eh_timer_workq
, &session
->unblock_work
);
579 * make sure all the events have completed before tell the driver
582 flush_workqueue(iscsi_eh_timer_workq
);
584 EXPORT_SYMBOL_GPL(iscsi_unblock_session
);
586 static void __iscsi_block_session(struct work_struct
*work
)
588 struct iscsi_cls_session
*session
=
589 container_of(work
, struct iscsi_cls_session
,
593 spin_lock_irqsave(&session
->lock
, flags
);
594 session
->state
= ISCSI_SESSION_FAILED
;
595 spin_unlock_irqrestore(&session
->lock
, flags
);
596 scsi_target_block(&session
->dev
);
597 queue_delayed_work(iscsi_eh_timer_workq
, &session
->recovery_work
,
598 session
->recovery_tmo
* HZ
);
601 void iscsi_block_session(struct iscsi_cls_session
*session
)
603 queue_work(iscsi_eh_timer_workq
, &session
->block_work
);
605 EXPORT_SYMBOL_GPL(iscsi_block_session
);
607 static void __iscsi_unbind_session(struct work_struct
*work
)
609 struct iscsi_cls_session
*session
=
610 container_of(work
, struct iscsi_cls_session
,
612 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
613 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
616 /* Prevent new scans and make sure scanning is not in progress */
617 mutex_lock(&ihost
->mutex
);
618 spin_lock_irqsave(&session
->lock
, flags
);
619 if (session
->target_id
== ISCSI_MAX_TARGET
) {
620 spin_unlock_irqrestore(&session
->lock
, flags
);
621 mutex_unlock(&ihost
->mutex
);
624 session
->target_id
= ISCSI_MAX_TARGET
;
625 spin_unlock_irqrestore(&session
->lock
, flags
);
626 mutex_unlock(&ihost
->mutex
);
628 scsi_remove_target(&session
->dev
);
629 iscsi_session_event(session
, ISCSI_KEVENT_UNBIND_SESSION
);
632 static int iscsi_unbind_session(struct iscsi_cls_session
*session
)
634 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
635 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
637 return queue_work(ihost
->scan_workq
, &session
->unbind_work
);
640 struct iscsi_cls_session
*
641 iscsi_alloc_session(struct Scsi_Host
*shost
, struct iscsi_transport
*transport
,
644 struct iscsi_cls_session
*session
;
646 session
= kzalloc(sizeof(*session
) + dd_size
,
651 session
->transport
= transport
;
652 session
->recovery_tmo
= 120;
653 session
->state
= ISCSI_SESSION_FREE
;
654 INIT_DELAYED_WORK(&session
->recovery_work
, session_recovery_timedout
);
655 INIT_LIST_HEAD(&session
->sess_list
);
656 INIT_WORK(&session
->unblock_work
, __iscsi_unblock_session
);
657 INIT_WORK(&session
->block_work
, __iscsi_block_session
);
658 INIT_WORK(&session
->unbind_work
, __iscsi_unbind_session
);
659 INIT_WORK(&session
->scan_work
, iscsi_scan_session
);
660 spin_lock_init(&session
->lock
);
662 /* this is released in the dev's release function */
663 scsi_host_get(shost
);
664 session
->dev
.parent
= &shost
->shost_gendev
;
665 session
->dev
.release
= iscsi_session_release
;
666 device_initialize(&session
->dev
);
668 session
->dd_data
= &session
[1];
671 EXPORT_SYMBOL_GPL(iscsi_alloc_session
);
673 static int iscsi_get_next_target_id(struct device
*dev
, void *data
)
675 struct iscsi_cls_session
*session
;
679 if (!iscsi_is_session_dev(dev
))
682 session
= iscsi_dev_to_session(dev
);
683 spin_lock_irqsave(&session
->lock
, flags
);
684 if (*((unsigned int *) data
) == session
->target_id
)
686 spin_unlock_irqrestore(&session
->lock
, flags
);
690 int iscsi_add_session(struct iscsi_cls_session
*session
, unsigned int target_id
)
692 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
693 struct iscsi_cls_host
*ihost
;
695 unsigned int id
= target_id
;
698 ihost
= shost
->shost_data
;
699 session
->sid
= atomic_add_return(1, &iscsi_session_nr
);
701 if (id
== ISCSI_MAX_TARGET
) {
702 for (id
= 0; id
< ISCSI_MAX_TARGET
; id
++) {
703 err
= device_for_each_child(&shost
->shost_gendev
, &id
,
704 iscsi_get_next_target_id
);
709 if (id
== ISCSI_MAX_TARGET
) {
710 iscsi_cls_session_printk(KERN_ERR
, session
,
711 "Too many iscsi targets. Max "
712 "number of targets is %d.\n",
713 ISCSI_MAX_TARGET
- 1);
717 session
->target_id
= id
;
719 snprintf(session
->dev
.bus_id
, BUS_ID_SIZE
, "session%u",
721 err
= device_add(&session
->dev
);
723 iscsi_cls_session_printk(KERN_ERR
, session
,
724 "could not register session's dev\n");
727 transport_register_device(&session
->dev
);
729 spin_lock_irqsave(&sesslock
, flags
);
730 list_add(&session
->sess_list
, &sesslist
);
731 spin_unlock_irqrestore(&sesslock
, flags
);
733 iscsi_session_event(session
, ISCSI_KEVENT_CREATE_SESSION
);
737 scsi_host_put(shost
);
740 EXPORT_SYMBOL_GPL(iscsi_add_session
);
743 * iscsi_create_session - create iscsi class session
745 * @transport: iscsi transport
746 * @dd_size: private driver data size
747 * @target_id: which target
749 * This can be called from a LLD or iscsi_transport.
751 struct iscsi_cls_session
*
752 iscsi_create_session(struct Scsi_Host
*shost
, struct iscsi_transport
*transport
,
753 int dd_size
, unsigned int target_id
)
755 struct iscsi_cls_session
*session
;
757 session
= iscsi_alloc_session(shost
, transport
, dd_size
);
761 if (iscsi_add_session(session
, target_id
)) {
762 iscsi_free_session(session
);
767 EXPORT_SYMBOL_GPL(iscsi_create_session
);
769 static void iscsi_conn_release(struct device
*dev
)
771 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
772 struct device
*parent
= conn
->dev
.parent
;
778 static int iscsi_is_conn_dev(const struct device
*dev
)
780 return dev
->release
== iscsi_conn_release
;
783 static int iscsi_iter_destroy_conn_fn(struct device
*dev
, void *data
)
785 if (!iscsi_is_conn_dev(dev
))
787 return iscsi_destroy_conn(iscsi_dev_to_conn(dev
));
790 void iscsi_remove_session(struct iscsi_cls_session
*session
)
792 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
793 struct iscsi_cls_host
*ihost
= shost
->shost_data
;
797 spin_lock_irqsave(&sesslock
, flags
);
798 list_del(&session
->sess_list
);
799 spin_unlock_irqrestore(&sesslock
, flags
);
801 /* make sure there are no blocks/unblocks queued */
802 flush_workqueue(iscsi_eh_timer_workq
);
803 /* make sure the timedout callout is not running */
804 if (!cancel_delayed_work(&session
->recovery_work
))
805 flush_workqueue(iscsi_eh_timer_workq
);
807 * If we are blocked let commands flow again. The lld or iscsi
808 * layer should set up the queuecommand to fail commands.
809 * We assume that LLD will not be calling block/unblock while
810 * removing the session.
812 spin_lock_irqsave(&session
->lock
, flags
);
813 session
->state
= ISCSI_SESSION_FREE
;
814 spin_unlock_irqrestore(&session
->lock
, flags
);
816 scsi_target_unblock(&session
->dev
);
817 /* flush running scans then delete devices */
818 flush_workqueue(ihost
->scan_workq
);
819 __iscsi_unbind_session(&session
->unbind_work
);
821 /* hw iscsi may not have removed all connections from session */
822 err
= device_for_each_child(&session
->dev
, NULL
,
823 iscsi_iter_destroy_conn_fn
);
825 iscsi_cls_session_printk(KERN_ERR
, session
,
826 "Could not delete all connections "
827 "for session. Error %d.\n", err
);
829 transport_unregister_device(&session
->dev
);
830 device_del(&session
->dev
);
832 EXPORT_SYMBOL_GPL(iscsi_remove_session
);
834 void iscsi_free_session(struct iscsi_cls_session
*session
)
836 iscsi_session_event(session
, ISCSI_KEVENT_DESTROY_SESSION
);
837 put_device(&session
->dev
);
839 EXPORT_SYMBOL_GPL(iscsi_free_session
);
842 * iscsi_destroy_session - destroy iscsi session
843 * @session: iscsi_session
845 * Can be called by a LLD or iscsi_transport. There must not be
846 * any running connections.
848 int iscsi_destroy_session(struct iscsi_cls_session
*session
)
850 iscsi_remove_session(session
);
851 iscsi_free_session(session
);
854 EXPORT_SYMBOL_GPL(iscsi_destroy_session
);
857 * iscsi_create_conn - create iscsi class connection
858 * @session: iscsi cls session
859 * @dd_size: private driver data size
860 * @cid: connection id
862 * This can be called from a LLD or iscsi_transport. The connection
863 * is child of the session so cid must be unique for all connections
866 * Since we do not support MCS, cid will normally be zero. In some cases
867 * for software iscsi we could be trying to preallocate a connection struct
868 * in which case there could be two connection structs and cid would be
871 struct iscsi_cls_conn
*
872 iscsi_create_conn(struct iscsi_cls_session
*session
, int dd_size
, uint32_t cid
)
874 struct iscsi_transport
*transport
= session
->transport
;
875 struct iscsi_cls_conn
*conn
;
879 conn
= kzalloc(sizeof(*conn
) + dd_size
, GFP_KERNEL
);
883 conn
->dd_data
= &conn
[1];
885 INIT_LIST_HEAD(&conn
->conn_list
);
886 conn
->transport
= transport
;
889 /* this is released in the dev's release function */
890 if (!get_device(&session
->dev
))
893 snprintf(conn
->dev
.bus_id
, BUS_ID_SIZE
, "connection%d:%u",
895 conn
->dev
.parent
= &session
->dev
;
896 conn
->dev
.release
= iscsi_conn_release
;
897 err
= device_register(&conn
->dev
);
899 iscsi_cls_session_printk(KERN_ERR
, session
, "could not "
900 "register connection's dev\n");
901 goto release_parent_ref
;
903 transport_register_device(&conn
->dev
);
905 spin_lock_irqsave(&connlock
, flags
);
906 list_add(&conn
->conn_list
, &connlist
);
908 spin_unlock_irqrestore(&connlock
, flags
);
912 put_device(&session
->dev
);
918 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
921 * iscsi_destroy_conn - destroy iscsi class connection
922 * @conn: iscsi cls session
924 * This can be called from a LLD or iscsi_transport.
926 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
930 spin_lock_irqsave(&connlock
, flags
);
932 list_del(&conn
->conn_list
);
933 spin_unlock_irqrestore(&connlock
, flags
);
935 transport_unregister_device(&conn
->dev
);
936 device_unregister(&conn
->dev
);
939 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
942 * iscsi interface functions
944 static struct iscsi_internal
*
945 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
947 struct iscsi_internal
*priv
;
950 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
951 list_for_each_entry(priv
, &iscsi_transports
, list
) {
952 if (tt
== priv
->iscsi_transport
) {
953 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
957 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
962 iscsi_broadcast_skb(struct sk_buff
*skb
, gfp_t gfp
)
966 rc
= netlink_broadcast(nls
, skb
, 0, 1, gfp
);
968 printk(KERN_ERR
"iscsi: can not broadcast skb (%d)\n", rc
);
976 iscsi_unicast_skb(struct sk_buff
*skb
, int pid
)
980 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
982 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
989 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
990 char *data
, uint32_t data_size
)
992 struct nlmsghdr
*nlh
;
994 struct iscsi_uevent
*ev
;
996 struct iscsi_internal
*priv
;
997 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
1000 priv
= iscsi_if_transport_lookup(conn
->transport
);
1004 skb
= alloc_skb(len
, GFP_ATOMIC
);
1006 iscsi_conn_error(conn
, ISCSI_ERR_CONN_FAILED
);
1007 iscsi_cls_conn_printk(KERN_ERR
, conn
, "can not deliver "
1008 "control PDU: OOM\n");
1012 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
1013 ev
= NLMSG_DATA(nlh
);
1014 memset(ev
, 0, sizeof(*ev
));
1015 ev
->transport_handle
= iscsi_handle(conn
->transport
);
1016 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
1017 ev
->r
.recv_req
.cid
= conn
->cid
;
1018 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
1019 pdu
= (char*)ev
+ sizeof(*ev
);
1020 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
1021 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
1023 return iscsi_unicast_skb(skb
, priv
->daemon_pid
);
1025 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
1027 void iscsi_conn_error(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
1029 struct nlmsghdr
*nlh
;
1030 struct sk_buff
*skb
;
1031 struct iscsi_uevent
*ev
;
1032 struct iscsi_internal
*priv
;
1033 int len
= NLMSG_SPACE(sizeof(*ev
));
1035 priv
= iscsi_if_transport_lookup(conn
->transport
);
1039 skb
= alloc_skb(len
, GFP_ATOMIC
);
1041 iscsi_cls_conn_printk(KERN_ERR
, conn
, "gracefully ignored "
1042 "conn error (%d)\n", error
);
1046 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
1047 ev
= NLMSG_DATA(nlh
);
1048 ev
->transport_handle
= iscsi_handle(conn
->transport
);
1049 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
1050 ev
->r
.connerror
.error
= error
;
1051 ev
->r
.connerror
.cid
= conn
->cid
;
1052 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
1054 iscsi_broadcast_skb(skb
, GFP_ATOMIC
);
1056 iscsi_cls_conn_printk(KERN_INFO
, conn
, "detected conn error (%d)\n",
1059 EXPORT_SYMBOL_GPL(iscsi_conn_error
);
1062 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
1063 void *payload
, int size
)
1065 struct sk_buff
*skb
;
1066 struct nlmsghdr
*nlh
;
1067 int len
= NLMSG_SPACE(size
);
1068 int flags
= multi
? NLM_F_MULTI
: 0;
1069 int t
= done
? NLMSG_DONE
: type
;
1071 skb
= alloc_skb(len
, GFP_ATOMIC
);
1073 printk(KERN_ERR
"Could not allocate skb to send reply.\n");
1077 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
1078 nlh
->nlmsg_flags
= flags
;
1079 memcpy(NLMSG_DATA(nlh
), payload
, size
);
1080 return iscsi_unicast_skb(skb
, pid
);
1084 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
1086 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1087 struct iscsi_stats
*stats
;
1088 struct sk_buff
*skbstat
;
1089 struct iscsi_cls_conn
*conn
;
1090 struct nlmsghdr
*nlhstat
;
1091 struct iscsi_uevent
*evstat
;
1092 struct iscsi_internal
*priv
;
1093 int len
= NLMSG_SPACE(sizeof(*ev
) +
1094 sizeof(struct iscsi_stats
) +
1095 sizeof(struct iscsi_stats_custom
) *
1096 ISCSI_STATS_CUSTOM_MAX
);
1099 priv
= iscsi_if_transport_lookup(transport
);
1103 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
1110 skbstat
= alloc_skb(len
, GFP_ATOMIC
);
1112 iscsi_cls_conn_printk(KERN_ERR
, conn
, "can not "
1113 "deliver stats: OOM\n");
1117 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
1118 (len
- sizeof(*nlhstat
)), 0);
1119 evstat
= NLMSG_DATA(nlhstat
);
1120 memset(evstat
, 0, sizeof(*evstat
));
1121 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
1122 evstat
->type
= nlh
->nlmsg_type
;
1123 evstat
->u
.get_stats
.cid
=
1124 ev
->u
.get_stats
.cid
;
1125 evstat
->u
.get_stats
.sid
=
1126 ev
->u
.get_stats
.sid
;
1127 stats
= (struct iscsi_stats
*)
1128 ((char*)evstat
+ sizeof(*evstat
));
1129 memset(stats
, 0, sizeof(*stats
));
1131 transport
->get_stats(conn
, stats
);
1132 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
1133 sizeof(struct iscsi_stats
) +
1134 sizeof(struct iscsi_stats_custom
) *
1135 stats
->custom_length
);
1136 actual_size
-= sizeof(*nlhstat
);
1137 actual_size
= NLMSG_LENGTH(actual_size
);
1138 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
1139 nlhstat
->nlmsg_len
= actual_size
;
1141 err
= iscsi_unicast_skb(skbstat
, priv
->daemon_pid
);
1142 } while (err
< 0 && err
!= -ECONNREFUSED
);
1148 * iscsi_session_event - send session destr. completion event
1149 * @session: iscsi class session
1150 * @event: type of event
1152 int iscsi_session_event(struct iscsi_cls_session
*session
,
1153 enum iscsi_uevent_e event
)
1155 struct iscsi_internal
*priv
;
1156 struct Scsi_Host
*shost
;
1157 struct iscsi_uevent
*ev
;
1158 struct sk_buff
*skb
;
1159 struct nlmsghdr
*nlh
;
1160 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
1162 priv
= iscsi_if_transport_lookup(session
->transport
);
1165 shost
= iscsi_session_to_shost(session
);
1167 skb
= alloc_skb(len
, GFP_KERNEL
);
1169 iscsi_cls_session_printk(KERN_ERR
, session
,
1170 "Cannot notify userspace of session "
1171 "event %u\n", event
);
1175 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
1176 ev
= NLMSG_DATA(nlh
);
1177 ev
->transport_handle
= iscsi_handle(session
->transport
);
1181 case ISCSI_KEVENT_DESTROY_SESSION
:
1182 ev
->r
.d_session
.host_no
= shost
->host_no
;
1183 ev
->r
.d_session
.sid
= session
->sid
;
1185 case ISCSI_KEVENT_CREATE_SESSION
:
1186 ev
->r
.c_session_ret
.host_no
= shost
->host_no
;
1187 ev
->r
.c_session_ret
.sid
= session
->sid
;
1189 case ISCSI_KEVENT_UNBIND_SESSION
:
1190 ev
->r
.unbind_session
.host_no
= shost
->host_no
;
1191 ev
->r
.unbind_session
.sid
= session
->sid
;
1194 iscsi_cls_session_printk(KERN_ERR
, session
, "Invalid event "
1201 * this will occur if the daemon is not up, so we just warn
1202 * the user and when the daemon is restarted it will handle it
1204 rc
= iscsi_broadcast_skb(skb
, GFP_KERNEL
);
1206 iscsi_cls_session_printk(KERN_ERR
, session
,
1207 "Cannot notify userspace of session "
1208 "event %u. Check iscsi daemon\n",
1212 EXPORT_SYMBOL_GPL(iscsi_session_event
);
1215 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_endpoint
*ep
,
1216 struct iscsi_uevent
*ev
, uint32_t initial_cmdsn
,
1217 uint16_t cmds_max
, uint16_t queue_depth
)
1219 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
1220 struct iscsi_cls_session
*session
;
1223 session
= transport
->create_session(ep
, cmds_max
, queue_depth
,
1224 initial_cmdsn
, &host_no
);
1228 ev
->r
.c_session_ret
.host_no
= host_no
;
1229 ev
->r
.c_session_ret
.sid
= session
->sid
;
1234 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1236 struct iscsi_cls_conn
*conn
;
1237 struct iscsi_cls_session
*session
;
1239 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
1241 printk(KERN_ERR
"iscsi: invalid session %d.\n",
1246 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
1248 iscsi_cls_session_printk(KERN_ERR
, session
,
1249 "couldn't create a new connection.");
1253 ev
->r
.c_conn_ret
.sid
= session
->sid
;
1254 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
1259 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1261 struct iscsi_cls_conn
*conn
;
1263 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
1267 if (transport
->destroy_conn
)
1268 transport
->destroy_conn(conn
);
1273 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1275 char *data
= (char*)ev
+ sizeof(*ev
);
1276 struct iscsi_cls_conn
*conn
;
1277 struct iscsi_cls_session
*session
;
1278 int err
= 0, value
= 0;
1280 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
1281 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
1282 if (!conn
|| !session
)
1285 switch (ev
->u
.set_param
.param
) {
1286 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
1287 sscanf(data
, "%d", &value
);
1289 session
->recovery_tmo
= value
;
1292 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
,
1293 data
, ev
->u
.set_param
.len
);
1300 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
1301 struct iscsi_uevent
*ev
, int msg_type
)
1303 struct iscsi_endpoint
*ep
;
1304 struct sockaddr
*dst_addr
;
1308 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1309 if (!transport
->ep_connect
)
1312 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1313 ep
= transport
->ep_connect(dst_addr
,
1314 ev
->u
.ep_connect
.non_blocking
);
1318 ev
->r
.ep_connect_ret
.handle
= ep
->id
;
1320 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1321 if (!transport
->ep_poll
)
1324 ep
= iscsi_lookup_endpoint(ev
->u
.ep_poll
.ep_handle
);
1328 ev
->r
.retcode
= transport
->ep_poll(ep
,
1329 ev
->u
.ep_poll
.timeout_ms
);
1331 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1332 if (!transport
->ep_disconnect
)
1335 ep
= iscsi_lookup_endpoint(ev
->u
.ep_disconnect
.ep_handle
);
1339 transport
->ep_disconnect(ep
);
1346 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
1347 struct iscsi_uevent
*ev
)
1349 struct Scsi_Host
*shost
;
1350 struct sockaddr
*dst_addr
;
1353 if (!transport
->tgt_dscvr
)
1356 shost
= scsi_host_lookup(ev
->u
.tgt_dscvr
.host_no
);
1357 if (IS_ERR(shost
)) {
1358 printk(KERN_ERR
"target discovery could not find host no %u\n",
1359 ev
->u
.tgt_dscvr
.host_no
);
1364 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1365 err
= transport
->tgt_dscvr(shost
, ev
->u
.tgt_dscvr
.type
,
1366 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
1367 scsi_host_put(shost
);
1372 iscsi_set_host_param(struct iscsi_transport
*transport
,
1373 struct iscsi_uevent
*ev
)
1375 char *data
= (char*)ev
+ sizeof(*ev
);
1376 struct Scsi_Host
*shost
;
1379 if (!transport
->set_host_param
)
1382 shost
= scsi_host_lookup(ev
->u
.set_host_param
.host_no
);
1383 if (IS_ERR(shost
)) {
1384 printk(KERN_ERR
"set_host_param could not find host no %u\n",
1385 ev
->u
.set_host_param
.host_no
);
1389 err
= transport
->set_host_param(shost
, ev
->u
.set_host_param
.param
,
1390 data
, ev
->u
.set_host_param
.len
);
1391 scsi_host_put(shost
);
1396 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
1399 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1400 struct iscsi_transport
*transport
= NULL
;
1401 struct iscsi_internal
*priv
;
1402 struct iscsi_cls_session
*session
;
1403 struct iscsi_cls_conn
*conn
;
1404 struct iscsi_endpoint
*ep
= NULL
;
1406 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
1409 transport
= priv
->iscsi_transport
;
1411 if (!try_module_get(transport
->owner
))
1414 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1416 switch (nlh
->nlmsg_type
) {
1417 case ISCSI_UEVENT_CREATE_SESSION
:
1418 err
= iscsi_if_create_session(priv
, ep
, ev
,
1419 ev
->u
.c_session
.initial_cmdsn
,
1420 ev
->u
.c_session
.cmds_max
,
1421 ev
->u
.c_session
.queue_depth
);
1423 case ISCSI_UEVENT_CREATE_BOUND_SESSION
:
1424 ep
= iscsi_lookup_endpoint(ev
->u
.c_bound_session
.ep_handle
);
1430 err
= iscsi_if_create_session(priv
, ep
, ev
,
1431 ev
->u
.c_bound_session
.initial_cmdsn
,
1432 ev
->u
.c_bound_session
.cmds_max
,
1433 ev
->u
.c_bound_session
.queue_depth
);
1435 case ISCSI_UEVENT_DESTROY_SESSION
:
1436 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1438 transport
->destroy_session(session
);
1442 case ISCSI_UEVENT_UNBIND_SESSION
:
1443 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1445 iscsi_unbind_session(session
);
1449 case ISCSI_UEVENT_CREATE_CONN
:
1450 err
= iscsi_if_create_conn(transport
, ev
);
1452 case ISCSI_UEVENT_DESTROY_CONN
:
1453 err
= iscsi_if_destroy_conn(transport
, ev
);
1455 case ISCSI_UEVENT_BIND_CONN
:
1456 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1457 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1459 if (session
&& conn
)
1460 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1461 ev
->u
.b_conn
.transport_eph
,
1462 ev
->u
.b_conn
.is_leading
);
1466 case ISCSI_UEVENT_SET_PARAM
:
1467 err
= iscsi_set_param(transport
, ev
);
1469 case ISCSI_UEVENT_START_CONN
:
1470 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1472 ev
->r
.retcode
= transport
->start_conn(conn
);
1476 case ISCSI_UEVENT_STOP_CONN
:
1477 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1479 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1483 case ISCSI_UEVENT_SEND_PDU
:
1484 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1486 ev
->r
.retcode
= transport
->send_pdu(conn
,
1487 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1488 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1489 ev
->u
.send_pdu
.data_size
);
1493 case ISCSI_UEVENT_GET_STATS
:
1494 err
= iscsi_if_get_stats(transport
, nlh
);
1496 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1497 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1498 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1499 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1501 case ISCSI_UEVENT_TGT_DSCVR
:
1502 err
= iscsi_tgt_dscvr(transport
, ev
);
1504 case ISCSI_UEVENT_SET_HOST_PARAM
:
1505 err
= iscsi_set_host_param(transport
, ev
);
1512 module_put(transport
->owner
);
1517 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1518 * Malformed skbs with wrong lengths or invalid creds are not processed.
1521 iscsi_if_rx(struct sk_buff
*skb
)
1523 mutex_lock(&rx_queue_mutex
);
1524 while (skb
->len
>= NLMSG_SPACE(0)) {
1527 struct nlmsghdr
*nlh
;
1528 struct iscsi_uevent
*ev
;
1530 nlh
= nlmsg_hdr(skb
);
1531 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1532 skb
->len
< nlh
->nlmsg_len
) {
1536 ev
= NLMSG_DATA(nlh
);
1537 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1538 if (rlen
> skb
->len
)
1541 err
= iscsi_if_recv_msg(skb
, nlh
);
1543 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1548 * special case for GET_STATS:
1549 * on success - sending reply and stats from
1550 * inside of if_recv_msg(),
1551 * on error - fall through.
1553 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1555 err
= iscsi_if_send_reply(
1556 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1557 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1558 } while (err
< 0 && err
!= -ECONNREFUSED
);
1559 skb_pull(skb
, rlen
);
1561 mutex_unlock(&rx_queue_mutex
);
1564 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1565 struct device_attribute dev_attr_##_prefix##_##_name = \
1566 __ATTR(_name,_mode,_show,_store)
1569 * iSCSI connection attrs
1571 #define iscsi_conn_attr_show(param) \
1573 show_conn_param_##param(struct device *dev, \
1574 struct device_attribute *attr, char *buf) \
1576 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1577 struct iscsi_transport *t = conn->transport; \
1578 return t->get_conn_param(conn, param, buf); \
1581 #define iscsi_conn_attr(field, param) \
1582 iscsi_conn_attr_show(param) \
1583 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1586 iscsi_conn_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
);
1587 iscsi_conn_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
);
1588 iscsi_conn_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
);
1589 iscsi_conn_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
);
1590 iscsi_conn_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
);
1591 iscsi_conn_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
);
1592 iscsi_conn_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
);
1593 iscsi_conn_attr(port
, ISCSI_PARAM_CONN_PORT
);
1594 iscsi_conn_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
);
1595 iscsi_conn_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1596 iscsi_conn_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1597 iscsi_conn_attr(ping_tmo
, ISCSI_PARAM_PING_TMO
);
1598 iscsi_conn_attr(recv_tmo
, ISCSI_PARAM_RECV_TMO
);
1601 * iSCSI session attrs
1603 #define iscsi_session_attr_show(param, perm) \
1605 show_session_param_##param(struct device *dev, \
1606 struct device_attribute *attr, char *buf) \
1608 struct iscsi_cls_session *session = \
1609 iscsi_dev_to_session(dev->parent); \
1610 struct iscsi_transport *t = session->transport; \
1612 if (perm && !capable(CAP_SYS_ADMIN)) \
1614 return t->get_session_param(session, param, buf); \
1617 #define iscsi_session_attr(field, param, perm) \
1618 iscsi_session_attr_show(param, perm) \
1619 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1622 iscsi_session_attr(targetname
, ISCSI_PARAM_TARGET_NAME
, 0);
1623 iscsi_session_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
, 0);
1624 iscsi_session_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
, 0);
1625 iscsi_session_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
, 0);
1626 iscsi_session_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
, 0);
1627 iscsi_session_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
, 0);
1628 iscsi_session_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
, 0);
1629 iscsi_session_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
, 0);
1630 iscsi_session_attr(erl
, ISCSI_PARAM_ERL
, 0);
1631 iscsi_session_attr(tpgt
, ISCSI_PARAM_TPGT
, 0);
1632 iscsi_session_attr(username
, ISCSI_PARAM_USERNAME
, 1);
1633 iscsi_session_attr(username_in
, ISCSI_PARAM_USERNAME_IN
, 1);
1634 iscsi_session_attr(password
, ISCSI_PARAM_PASSWORD
, 1);
1635 iscsi_session_attr(password_in
, ISCSI_PARAM_PASSWORD_IN
, 1);
1636 iscsi_session_attr(fast_abort
, ISCSI_PARAM_FAST_ABORT
, 0);
1637 iscsi_session_attr(abort_tmo
, ISCSI_PARAM_ABORT_TMO
, 0);
1638 iscsi_session_attr(lu_reset_tmo
, ISCSI_PARAM_LU_RESET_TMO
, 0);
1639 iscsi_session_attr(ifacename
, ISCSI_PARAM_IFACE_NAME
, 0);
1640 iscsi_session_attr(initiatorname
, ISCSI_PARAM_INITIATOR_NAME
, 0)
1643 show_priv_session_state(struct device
*dev
, struct device_attribute
*attr
,
1646 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
->parent
);
1647 return sprintf(buf
, "%s\n", iscsi_session_state_name(session
->state
));
1649 static ISCSI_CLASS_ATTR(priv_sess
, state
, S_IRUGO
, show_priv_session_state
,
1652 #define iscsi_priv_session_attr_show(field, format) \
1654 show_priv_session_##field(struct device *dev, \
1655 struct device_attribute *attr, char *buf) \
1657 struct iscsi_cls_session *session = \
1658 iscsi_dev_to_session(dev->parent); \
1659 return sprintf(buf, format"\n", session->field); \
1662 #define iscsi_priv_session_attr(field, format) \
1663 iscsi_priv_session_attr_show(field, format) \
1664 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1666 iscsi_priv_session_attr(recovery_tmo
, "%d");
1671 #define iscsi_host_attr_show(param) \
1673 show_host_param_##param(struct device *dev, \
1674 struct device_attribute *attr, char *buf) \
1676 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1677 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1678 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1681 #define iscsi_host_attr(field, param) \
1682 iscsi_host_attr_show(param) \
1683 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1686 iscsi_host_attr(netdev
, ISCSI_HOST_PARAM_NETDEV_NAME
);
1687 iscsi_host_attr(hwaddress
, ISCSI_HOST_PARAM_HWADDRESS
);
1688 iscsi_host_attr(ipaddress
, ISCSI_HOST_PARAM_IPADDRESS
);
1689 iscsi_host_attr(initiatorname
, ISCSI_HOST_PARAM_INITIATOR_NAME
);
1691 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1693 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1698 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1700 if (tt->param_mask & param_flag) { \
1701 priv->session_attrs[count] = &dev_attr_sess_##field; \
1706 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1708 if (tt->param_mask & param_flag) { \
1709 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1714 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1716 if (tt->host_param_mask & param_flag) { \
1717 priv->host_attrs[count] = &dev_attr_host_##field; \
1722 static int iscsi_session_match(struct attribute_container
*cont
,
1725 struct iscsi_cls_session
*session
;
1726 struct Scsi_Host
*shost
;
1727 struct iscsi_internal
*priv
;
1729 if (!iscsi_is_session_dev(dev
))
1732 session
= iscsi_dev_to_session(dev
);
1733 shost
= iscsi_session_to_shost(session
);
1734 if (!shost
->transportt
)
1737 priv
= to_iscsi_internal(shost
->transportt
);
1738 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1741 return &priv
->session_cont
.ac
== cont
;
1744 static int iscsi_conn_match(struct attribute_container
*cont
,
1747 struct iscsi_cls_session
*session
;
1748 struct iscsi_cls_conn
*conn
;
1749 struct Scsi_Host
*shost
;
1750 struct iscsi_internal
*priv
;
1752 if (!iscsi_is_conn_dev(dev
))
1755 conn
= iscsi_dev_to_conn(dev
);
1756 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1757 shost
= iscsi_session_to_shost(session
);
1759 if (!shost
->transportt
)
1762 priv
= to_iscsi_internal(shost
->transportt
);
1763 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1766 return &priv
->conn_cont
.ac
== cont
;
1769 static int iscsi_host_match(struct attribute_container
*cont
,
1772 struct Scsi_Host
*shost
;
1773 struct iscsi_internal
*priv
;
1775 if (!scsi_is_host_device(dev
))
1778 shost
= dev_to_shost(dev
);
1779 if (!shost
->transportt
||
1780 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1783 priv
= to_iscsi_internal(shost
->transportt
);
1784 return &priv
->t
.host_attrs
.ac
== cont
;
1787 struct scsi_transport_template
*
1788 iscsi_register_transport(struct iscsi_transport
*tt
)
1790 struct iscsi_internal
*priv
;
1791 unsigned long flags
;
1796 priv
= iscsi_if_transport_lookup(tt
);
1800 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1803 INIT_LIST_HEAD(&priv
->list
);
1804 priv
->daemon_pid
= -1;
1805 priv
->iscsi_transport
= tt
;
1806 priv
->t
.user_scan
= iscsi_user_scan
;
1807 if (!(tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1808 priv
->t
.create_work_queue
= 1;
1810 priv
->dev
.class = &iscsi_transport_class
;
1811 snprintf(priv
->dev
.bus_id
, BUS_ID_SIZE
, "%s", tt
->name
);
1812 err
= device_register(&priv
->dev
);
1816 err
= sysfs_create_group(&priv
->dev
.kobj
, &iscsi_transport_group
);
1818 goto unregister_dev
;
1820 /* host parameters */
1821 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1822 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1823 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1824 priv
->t
.host_size
= sizeof(struct iscsi_cls_host
);
1825 transport_container_register(&priv
->t
.host_attrs
);
1827 SETUP_HOST_RD_ATTR(netdev
, ISCSI_HOST_NETDEV_NAME
);
1828 SETUP_HOST_RD_ATTR(ipaddress
, ISCSI_HOST_IPADDRESS
);
1829 SETUP_HOST_RD_ATTR(hwaddress
, ISCSI_HOST_HWADDRESS
);
1830 SETUP_HOST_RD_ATTR(initiatorname
, ISCSI_HOST_INITIATOR_NAME
);
1831 BUG_ON(count
> ISCSI_HOST_ATTRS
);
1832 priv
->host_attrs
[count
] = NULL
;
1835 /* connection parameters */
1836 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1837 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1838 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1839 transport_container_register(&priv
->conn_cont
);
1841 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1842 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1843 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1844 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1845 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1846 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1847 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1848 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1849 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1850 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1851 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1852 SETUP_CONN_RD_ATTR(ping_tmo
, ISCSI_PING_TMO
);
1853 SETUP_CONN_RD_ATTR(recv_tmo
, ISCSI_RECV_TMO
);
1855 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1856 priv
->conn_attrs
[count
] = NULL
;
1859 /* session parameters */
1860 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1861 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1862 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1863 transport_container_register(&priv
->session_cont
);
1865 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1866 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1867 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1868 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1869 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1870 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1871 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1872 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1873 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1874 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1875 SETUP_SESSION_RD_ATTR(password
, ISCSI_USERNAME
);
1876 SETUP_SESSION_RD_ATTR(password_in
, ISCSI_USERNAME_IN
);
1877 SETUP_SESSION_RD_ATTR(username
, ISCSI_PASSWORD
);
1878 SETUP_SESSION_RD_ATTR(username_in
, ISCSI_PASSWORD_IN
);
1879 SETUP_SESSION_RD_ATTR(fast_abort
, ISCSI_FAST_ABORT
);
1880 SETUP_SESSION_RD_ATTR(abort_tmo
, ISCSI_ABORT_TMO
);
1881 SETUP_SESSION_RD_ATTR(lu_reset_tmo
,ISCSI_LU_RESET_TMO
);
1882 SETUP_SESSION_RD_ATTR(ifacename
, ISCSI_IFACE_NAME
);
1883 SETUP_SESSION_RD_ATTR(initiatorname
, ISCSI_INITIATOR_NAME
);
1884 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1885 SETUP_PRIV_SESSION_RD_ATTR(state
);
1887 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1888 priv
->session_attrs
[count
] = NULL
;
1890 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1891 list_add(&priv
->list
, &iscsi_transports
);
1892 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1894 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1898 device_unregister(&priv
->dev
);
1904 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1906 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1908 struct iscsi_internal
*priv
;
1909 unsigned long flags
;
1913 mutex_lock(&rx_queue_mutex
);
1915 priv
= iscsi_if_transport_lookup(tt
);
1918 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1919 list_del(&priv
->list
);
1920 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1922 transport_container_unregister(&priv
->conn_cont
);
1923 transport_container_unregister(&priv
->session_cont
);
1924 transport_container_unregister(&priv
->t
.host_attrs
);
1926 sysfs_remove_group(&priv
->dev
.kobj
, &iscsi_transport_group
);
1927 device_unregister(&priv
->dev
);
1928 mutex_unlock(&rx_queue_mutex
);
1932 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1934 static __init
int iscsi_transport_init(void)
1938 printk(KERN_INFO
"Loading iSCSI transport class v%s.\n",
1939 ISCSI_TRANSPORT_VERSION
);
1941 atomic_set(&iscsi_session_nr
, 0);
1943 err
= class_register(&iscsi_transport_class
);
1947 err
= class_register(&iscsi_endpoint_class
);
1949 goto unregister_transport_class
;
1951 err
= transport_class_register(&iscsi_host_class
);
1953 goto unregister_endpoint_class
;
1955 err
= transport_class_register(&iscsi_connection_class
);
1957 goto unregister_host_class
;
1959 err
= transport_class_register(&iscsi_session_class
);
1961 goto unregister_conn_class
;
1963 nls
= netlink_kernel_create(&init_net
, NETLINK_ISCSI
, 1, iscsi_if_rx
,
1967 goto unregister_session_class
;
1970 iscsi_eh_timer_workq
= create_singlethread_workqueue("iscsi_eh");
1971 if (!iscsi_eh_timer_workq
)
1977 netlink_kernel_release(nls
);
1978 unregister_session_class
:
1979 transport_class_unregister(&iscsi_session_class
);
1980 unregister_conn_class
:
1981 transport_class_unregister(&iscsi_connection_class
);
1982 unregister_host_class
:
1983 transport_class_unregister(&iscsi_host_class
);
1984 unregister_endpoint_class
:
1985 class_unregister(&iscsi_endpoint_class
);
1986 unregister_transport_class
:
1987 class_unregister(&iscsi_transport_class
);
1991 static void __exit
iscsi_transport_exit(void)
1993 destroy_workqueue(iscsi_eh_timer_workq
);
1994 netlink_kernel_release(nls
);
1995 transport_class_unregister(&iscsi_connection_class
);
1996 transport_class_unregister(&iscsi_session_class
);
1997 transport_class_unregister(&iscsi_host_class
);
1998 class_unregister(&iscsi_endpoint_class
);
1999 class_unregister(&iscsi_transport_class
);
2002 module_init(iscsi_transport_init
);
2003 module_exit(iscsi_transport_exit
);
2005 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2006 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2007 "Alex Aizman <itn780@yahoo.com>");
2008 MODULE_DESCRIPTION("iSCSI Transport Interface");
2009 MODULE_LICENSE("GPL");
2010 MODULE_VERSION(ISCSI_TRANSPORT_VERSION
);