2 * iSCSI transport class definitions
4 * Copyright (C) IBM Corporation, 2004
5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <linux/module.h>
24 #include <linux/mutex.h>
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_host.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/scsi_transport.h>
30 #include <scsi/scsi_transport_iscsi.h>
31 #include <scsi/iscsi_if.h>
33 #define ISCSI_SESSION_ATTRS 19
34 #define ISCSI_CONN_ATTRS 11
35 #define ISCSI_HOST_ATTRS 4
36 #define ISCSI_TRANSPORT_VERSION "2.0-867"
38 struct iscsi_internal
{
40 struct scsi_transport_template t
;
41 struct iscsi_transport
*iscsi_transport
;
42 struct list_head list
;
43 struct class_device cdev
;
45 struct class_device_attribute
*host_attrs
[ISCSI_HOST_ATTRS
+ 1];
46 struct transport_container conn_cont
;
47 struct class_device_attribute
*conn_attrs
[ISCSI_CONN_ATTRS
+ 1];
48 struct transport_container session_cont
;
49 struct class_device_attribute
*session_attrs
[ISCSI_SESSION_ATTRS
+ 1];
52 static atomic_t iscsi_session_nr
; /* sysfs session id for next new session */
53 static struct workqueue_struct
*iscsi_eh_timer_workq
;
56 * list of registered transports and lock that must
57 * be held while accessing list. The iscsi_transport_lock must
58 * be acquired after the rx_queue_mutex.
60 static LIST_HEAD(iscsi_transports
);
61 static DEFINE_SPINLOCK(iscsi_transport_lock
);
63 #define to_iscsi_internal(tmpl) \
64 container_of(tmpl, struct iscsi_internal, t)
66 #define cdev_to_iscsi_internal(_cdev) \
67 container_of(_cdev, struct iscsi_internal, cdev)
69 static void iscsi_transport_release(struct class_device
*cdev
)
71 struct iscsi_internal
*priv
= cdev_to_iscsi_internal(cdev
);
76 * iscsi_transport_class represents the iscsi_transports that are
79 static struct class iscsi_transport_class
= {
80 .name
= "iscsi_transport",
81 .release
= iscsi_transport_release
,
85 show_transport_handle(struct class_device
*cdev
, char *buf
)
87 struct iscsi_internal
*priv
= cdev_to_iscsi_internal(cdev
);
88 return sprintf(buf
, "%llu\n", (unsigned long long)iscsi_handle(priv
->iscsi_transport
));
90 static CLASS_DEVICE_ATTR(handle
, S_IRUGO
, show_transport_handle
, NULL
);
92 #define show_transport_attr(name, format) \
94 show_transport_##name(struct class_device *cdev, char *buf) \
96 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
97 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
99 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
101 show_transport_attr(caps
, "0x%x");
102 show_transport_attr(max_lun
, "%d");
103 show_transport_attr(max_conn
, "%d");
104 show_transport_attr(max_cmd_len
, "%d");
106 static struct attribute
*iscsi_transport_attrs
[] = {
107 &class_device_attr_handle
.attr
,
108 &class_device_attr_caps
.attr
,
109 &class_device_attr_max_lun
.attr
,
110 &class_device_attr_max_conn
.attr
,
111 &class_device_attr_max_cmd_len
.attr
,
115 static struct attribute_group iscsi_transport_group
= {
116 .attrs
= iscsi_transport_attrs
,
121 static int iscsi_setup_host(struct transport_container
*tc
, struct device
*dev
,
122 struct class_device
*cdev
)
124 struct Scsi_Host
*shost
= dev_to_shost(dev
);
125 struct iscsi_host
*ihost
= shost
->shost_data
;
127 memset(ihost
, 0, sizeof(*ihost
));
128 INIT_LIST_HEAD(&ihost
->sessions
);
129 mutex_init(&ihost
->mutex
);
131 snprintf(ihost
->scan_workq_name
, KOBJ_NAME_LEN
, "iscsi_scan_%d",
133 ihost
->scan_workq
= create_singlethread_workqueue(
134 ihost
->scan_workq_name
);
135 if (!ihost
->scan_workq
)
140 static int iscsi_remove_host(struct transport_container
*tc
, struct device
*dev
,
141 struct class_device
*cdev
)
143 struct Scsi_Host
*shost
= dev_to_shost(dev
);
144 struct iscsi_host
*ihost
= shost
->shost_data
;
146 destroy_workqueue(ihost
->scan_workq
);
150 static DECLARE_TRANSPORT_CLASS(iscsi_host_class
,
156 static DECLARE_TRANSPORT_CLASS(iscsi_session_class
,
162 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class
,
168 static struct sock
*nls
;
169 static DEFINE_MUTEX(rx_queue_mutex
);
171 static LIST_HEAD(sesslist
);
172 static DEFINE_SPINLOCK(sesslock
);
173 static LIST_HEAD(connlist
);
174 static DEFINE_SPINLOCK(connlock
);
176 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn
*conn
)
178 struct iscsi_cls_session
*sess
= iscsi_dev_to_session(conn
->dev
.parent
);
183 * Returns the matching session to a given sid
185 static struct iscsi_cls_session
*iscsi_session_lookup(uint32_t sid
)
188 struct iscsi_cls_session
*sess
;
190 spin_lock_irqsave(&sesslock
, flags
);
191 list_for_each_entry(sess
, &sesslist
, sess_list
) {
192 if (sess
->sid
== sid
) {
193 spin_unlock_irqrestore(&sesslock
, flags
);
197 spin_unlock_irqrestore(&sesslock
, flags
);
202 * Returns the matching connection to a given sid / cid tuple
204 static struct iscsi_cls_conn
*iscsi_conn_lookup(uint32_t sid
, uint32_t cid
)
207 struct iscsi_cls_conn
*conn
;
209 spin_lock_irqsave(&connlock
, flags
);
210 list_for_each_entry(conn
, &connlist
, conn_list
) {
211 if ((conn
->cid
== cid
) && (iscsi_conn_get_sid(conn
) == sid
)) {
212 spin_unlock_irqrestore(&connlock
, flags
);
216 spin_unlock_irqrestore(&connlock
, flags
);
221 * The following functions can be used by LLDs that allocate
222 * their own scsi_hosts or by software iscsi LLDs
227 } iscsi_session_state_names
[] = {
228 { ISCSI_SESSION_LOGGED_IN
, "LOGGED_IN" },
229 { ISCSI_SESSION_FAILED
, "FAILED" },
230 { ISCSI_SESSION_FREE
, "FREE" },
233 const char *iscsi_session_state_name(int state
)
238 for (i
= 0; i
< ARRAY_SIZE(iscsi_session_state_names
); i
++) {
239 if (iscsi_session_state_names
[i
].value
== state
) {
240 name
= iscsi_session_state_names
[i
].name
;
247 int iscsi_session_chkready(struct iscsi_cls_session
*session
)
252 spin_lock_irqsave(&session
->lock
, flags
);
253 switch (session
->state
) {
254 case ISCSI_SESSION_LOGGED_IN
:
257 case ISCSI_SESSION_FAILED
:
258 err
= DID_IMM_RETRY
<< 16;
260 case ISCSI_SESSION_FREE
:
261 err
= DID_NO_CONNECT
<< 16;
264 err
= DID_NO_CONNECT
<< 16;
267 spin_unlock_irqrestore(&session
->lock
, flags
);
270 EXPORT_SYMBOL_GPL(iscsi_session_chkready
);
272 static void iscsi_session_release(struct device
*dev
)
274 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
);
275 struct Scsi_Host
*shost
;
277 shost
= iscsi_session_to_shost(session
);
278 scsi_host_put(shost
);
282 static int iscsi_is_session_dev(const struct device
*dev
)
284 return dev
->release
== iscsi_session_release
;
287 static int iscsi_user_scan(struct Scsi_Host
*shost
, uint channel
,
290 struct iscsi_host
*ihost
= shost
->shost_data
;
291 struct iscsi_cls_session
*session
;
293 mutex_lock(&ihost
->mutex
);
294 list_for_each_entry(session
, &ihost
->sessions
, host_list
) {
295 if ((channel
== SCAN_WILD_CARD
|| channel
== 0) &&
296 (id
== SCAN_WILD_CARD
|| id
== session
->target_id
))
297 scsi_scan_target(&session
->dev
, 0,
298 session
->target_id
, lun
, 1);
300 mutex_unlock(&ihost
->mutex
);
305 static void iscsi_scan_session(struct work_struct
*work
)
307 struct iscsi_cls_session
*session
=
308 container_of(work
, struct iscsi_cls_session
, scan_work
);
311 spin_lock_irqsave(&session
->lock
, flags
);
312 if (session
->state
!= ISCSI_SESSION_LOGGED_IN
) {
313 spin_unlock_irqrestore(&session
->lock
, flags
);
316 spin_unlock_irqrestore(&session
->lock
, flags
);
318 scsi_scan_target(&session
->dev
, 0, session
->target_id
,
322 static void session_recovery_timedout(struct work_struct
*work
)
324 struct iscsi_cls_session
*session
=
325 container_of(work
, struct iscsi_cls_session
,
329 dev_printk(KERN_INFO
, &session
->dev
, "iscsi: session recovery timed "
330 "out after %d secs\n", session
->recovery_tmo
);
332 spin_lock_irqsave(&session
->lock
, flags
);
333 switch (session
->state
) {
334 case ISCSI_SESSION_FAILED
:
335 session
->state
= ISCSI_SESSION_FREE
;
337 case ISCSI_SESSION_LOGGED_IN
:
338 case ISCSI_SESSION_FREE
:
339 /* we raced with the unblock's flush */
340 spin_unlock_irqrestore(&session
->lock
, flags
);
343 spin_unlock_irqrestore(&session
->lock
, flags
);
345 if (session
->transport
->session_recovery_timedout
)
346 session
->transport
->session_recovery_timedout(session
);
348 scsi_target_unblock(&session
->dev
);
351 void __iscsi_unblock_session(struct iscsi_cls_session
*session
)
353 if (!cancel_delayed_work(&session
->recovery_work
))
354 flush_workqueue(iscsi_eh_timer_workq
);
355 scsi_target_unblock(&session
->dev
);
358 void iscsi_unblock_session(struct iscsi_cls_session
*session
)
360 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
361 struct iscsi_host
*ihost
= shost
->shost_data
;
364 spin_lock_irqsave(&session
->lock
, flags
);
365 session
->state
= ISCSI_SESSION_LOGGED_IN
;
366 spin_unlock_irqrestore(&session
->lock
, flags
);
368 __iscsi_unblock_session(session
);
369 queue_work(ihost
->scan_workq
, &session
->scan_work
);
371 EXPORT_SYMBOL_GPL(iscsi_unblock_session
);
373 void iscsi_block_session(struct iscsi_cls_session
*session
)
377 spin_lock_irqsave(&session
->lock
, flags
);
378 session
->state
= ISCSI_SESSION_FAILED
;
379 spin_unlock_irqrestore(&session
->lock
, flags
);
381 scsi_target_block(&session
->dev
);
382 queue_delayed_work(iscsi_eh_timer_workq
, &session
->recovery_work
,
383 session
->recovery_tmo
* HZ
);
385 EXPORT_SYMBOL_GPL(iscsi_block_session
);
387 static void __iscsi_unbind_session(struct work_struct
*work
)
389 struct iscsi_cls_session
*session
=
390 container_of(work
, struct iscsi_cls_session
,
392 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
393 struct iscsi_host
*ihost
= shost
->shost_data
;
395 /* Prevent new scans and make sure scanning is not in progress */
396 mutex_lock(&ihost
->mutex
);
397 if (list_empty(&session
->host_list
)) {
398 mutex_unlock(&ihost
->mutex
);
401 list_del_init(&session
->host_list
);
402 mutex_unlock(&ihost
->mutex
);
404 scsi_remove_target(&session
->dev
);
405 iscsi_session_event(session
, ISCSI_KEVENT_UNBIND_SESSION
);
408 static int iscsi_unbind_session(struct iscsi_cls_session
*session
)
410 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
411 struct iscsi_host
*ihost
= shost
->shost_data
;
413 return queue_work(ihost
->scan_workq
, &session
->unbind_work
);
416 struct iscsi_cls_session
*
417 iscsi_alloc_session(struct Scsi_Host
*shost
,
418 struct iscsi_transport
*transport
)
420 struct iscsi_cls_session
*session
;
422 session
= kzalloc(sizeof(*session
) + transport
->sessiondata_size
,
427 session
->transport
= transport
;
428 session
->recovery_tmo
= 120;
429 session
->state
= ISCSI_SESSION_FREE
;
430 INIT_DELAYED_WORK(&session
->recovery_work
, session_recovery_timedout
);
431 INIT_LIST_HEAD(&session
->host_list
);
432 INIT_LIST_HEAD(&session
->sess_list
);
433 INIT_WORK(&session
->unbind_work
, __iscsi_unbind_session
);
434 INIT_WORK(&session
->scan_work
, iscsi_scan_session
);
435 spin_lock_init(&session
->lock
);
437 /* this is released in the dev's release function */
438 scsi_host_get(shost
);
439 session
->dev
.parent
= &shost
->shost_gendev
;
440 session
->dev
.release
= iscsi_session_release
;
441 device_initialize(&session
->dev
);
442 if (transport
->sessiondata_size
)
443 session
->dd_data
= &session
[1];
446 EXPORT_SYMBOL_GPL(iscsi_alloc_session
);
448 int iscsi_add_session(struct iscsi_cls_session
*session
, unsigned int target_id
)
450 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
451 struct iscsi_host
*ihost
;
455 ihost
= shost
->shost_data
;
456 session
->sid
= atomic_add_return(1, &iscsi_session_nr
);
457 session
->target_id
= target_id
;
459 snprintf(session
->dev
.bus_id
, BUS_ID_SIZE
, "session%u",
461 err
= device_add(&session
->dev
);
463 dev_printk(KERN_ERR
, &session
->dev
, "iscsi: could not "
464 "register session's dev\n");
467 transport_register_device(&session
->dev
);
469 spin_lock_irqsave(&sesslock
, flags
);
470 list_add(&session
->sess_list
, &sesslist
);
471 spin_unlock_irqrestore(&sesslock
, flags
);
473 mutex_lock(&ihost
->mutex
);
474 list_add(&session
->host_list
, &ihost
->sessions
);
475 mutex_unlock(&ihost
->mutex
);
477 iscsi_session_event(session
, ISCSI_KEVENT_CREATE_SESSION
);
481 scsi_host_put(shost
);
484 EXPORT_SYMBOL_GPL(iscsi_add_session
);
487 * iscsi_create_session - create iscsi class session
489 * @transport: iscsi transport
490 * @target_id: which target
492 * This can be called from a LLD or iscsi_transport.
494 struct iscsi_cls_session
*
495 iscsi_create_session(struct Scsi_Host
*shost
,
496 struct iscsi_transport
*transport
,
497 unsigned int target_id
)
499 struct iscsi_cls_session
*session
;
501 session
= iscsi_alloc_session(shost
, transport
);
505 if (iscsi_add_session(session
, target_id
)) {
506 iscsi_free_session(session
);
511 EXPORT_SYMBOL_GPL(iscsi_create_session
);
513 static void iscsi_conn_release(struct device
*dev
)
515 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
516 struct device
*parent
= conn
->dev
.parent
;
522 static int iscsi_is_conn_dev(const struct device
*dev
)
524 return dev
->release
== iscsi_conn_release
;
527 static int iscsi_iter_destroy_conn_fn(struct device
*dev
, void *data
)
529 if (!iscsi_is_conn_dev(dev
))
531 return iscsi_destroy_conn(iscsi_dev_to_conn(dev
));
534 void iscsi_remove_session(struct iscsi_cls_session
*session
)
536 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
537 struct iscsi_host
*ihost
= shost
->shost_data
;
541 spin_lock_irqsave(&sesslock
, flags
);
542 list_del(&session
->sess_list
);
543 spin_unlock_irqrestore(&sesslock
, flags
);
546 * If we are blocked let commands flow again. The lld or iscsi
547 * layer should set up the queuecommand to fail commands.
549 spin_lock_irqsave(&session
->lock
, flags
);
550 session
->state
= ISCSI_SESSION_FREE
;
551 spin_unlock_irqrestore(&session
->lock
, flags
);
552 __iscsi_unblock_session(session
);
553 iscsi_unbind_session(session
);
555 /* flush running scans */
556 flush_workqueue(ihost
->scan_workq
);
558 * If the session dropped while removing devices then we need to make
559 * sure it is not blocked
561 if (!cancel_delayed_work(&session
->recovery_work
))
562 flush_workqueue(iscsi_eh_timer_workq
);
564 /* hw iscsi may not have removed all connections from session */
565 err
= device_for_each_child(&session
->dev
, NULL
,
566 iscsi_iter_destroy_conn_fn
);
568 dev_printk(KERN_ERR
, &session
->dev
, "iscsi: Could not delete "
569 "all connections for session. Error %d.\n", err
);
571 transport_unregister_device(&session
->dev
);
572 device_del(&session
->dev
);
574 EXPORT_SYMBOL_GPL(iscsi_remove_session
);
576 void iscsi_free_session(struct iscsi_cls_session
*session
)
578 iscsi_session_event(session
, ISCSI_KEVENT_DESTROY_SESSION
);
579 put_device(&session
->dev
);
581 EXPORT_SYMBOL_GPL(iscsi_free_session
);
584 * iscsi_destroy_session - destroy iscsi session
585 * @session: iscsi_session
587 * Can be called by a LLD or iscsi_transport. There must not be
588 * any running connections.
590 int iscsi_destroy_session(struct iscsi_cls_session
*session
)
592 iscsi_remove_session(session
);
593 iscsi_free_session(session
);
596 EXPORT_SYMBOL_GPL(iscsi_destroy_session
);
599 * iscsi_create_conn - create iscsi class connection
600 * @session: iscsi cls session
601 * @cid: connection id
603 * This can be called from a LLD or iscsi_transport. The connection
604 * is child of the session so cid must be unique for all connections
607 * Since we do not support MCS, cid will normally be zero. In some cases
608 * for software iscsi we could be trying to preallocate a connection struct
609 * in which case there could be two connection structs and cid would be
612 struct iscsi_cls_conn
*
613 iscsi_create_conn(struct iscsi_cls_session
*session
, uint32_t cid
)
615 struct iscsi_transport
*transport
= session
->transport
;
616 struct iscsi_cls_conn
*conn
;
620 conn
= kzalloc(sizeof(*conn
) + transport
->conndata_size
, GFP_KERNEL
);
624 if (transport
->conndata_size
)
625 conn
->dd_data
= &conn
[1];
627 INIT_LIST_HEAD(&conn
->conn_list
);
628 conn
->transport
= transport
;
631 /* this is released in the dev's release function */
632 if (!get_device(&session
->dev
))
635 snprintf(conn
->dev
.bus_id
, BUS_ID_SIZE
, "connection%d:%u",
637 conn
->dev
.parent
= &session
->dev
;
638 conn
->dev
.release
= iscsi_conn_release
;
639 err
= device_register(&conn
->dev
);
641 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: could not register "
642 "connection's dev\n");
643 goto release_parent_ref
;
645 transport_register_device(&conn
->dev
);
647 spin_lock_irqsave(&connlock
, flags
);
648 list_add(&conn
->conn_list
, &connlist
);
650 spin_unlock_irqrestore(&connlock
, flags
);
654 put_device(&session
->dev
);
660 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
663 * iscsi_destroy_conn - destroy iscsi class connection
664 * @conn: iscsi cls session
666 * This can be called from a LLD or iscsi_transport.
668 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
672 spin_lock_irqsave(&connlock
, flags
);
674 list_del(&conn
->conn_list
);
675 spin_unlock_irqrestore(&connlock
, flags
);
677 transport_unregister_device(&conn
->dev
);
678 device_unregister(&conn
->dev
);
681 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
684 * iscsi interface functions
686 static struct iscsi_internal
*
687 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
689 struct iscsi_internal
*priv
;
692 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
693 list_for_each_entry(priv
, &iscsi_transports
, list
) {
694 if (tt
== priv
->iscsi_transport
) {
695 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
699 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
704 iscsi_broadcast_skb(struct sk_buff
*skb
, gfp_t gfp
)
708 rc
= netlink_broadcast(nls
, skb
, 0, 1, gfp
);
710 printk(KERN_ERR
"iscsi: can not broadcast skb (%d)\n", rc
);
718 iscsi_unicast_skb(struct sk_buff
*skb
, int pid
)
722 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
724 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
731 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
732 char *data
, uint32_t data_size
)
734 struct nlmsghdr
*nlh
;
736 struct iscsi_uevent
*ev
;
738 struct iscsi_internal
*priv
;
739 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
742 priv
= iscsi_if_transport_lookup(conn
->transport
);
746 skb
= alloc_skb(len
, GFP_ATOMIC
);
748 iscsi_conn_error(conn
, ISCSI_ERR_CONN_FAILED
);
749 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not deliver "
750 "control PDU: OOM\n");
754 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
755 ev
= NLMSG_DATA(nlh
);
756 memset(ev
, 0, sizeof(*ev
));
757 ev
->transport_handle
= iscsi_handle(conn
->transport
);
758 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
759 ev
->r
.recv_req
.cid
= conn
->cid
;
760 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
761 pdu
= (char*)ev
+ sizeof(*ev
);
762 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
763 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
765 return iscsi_unicast_skb(skb
, priv
->daemon_pid
);
767 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
769 void iscsi_conn_error(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
771 struct iscsi_cls_session
*session
= iscsi_conn_to_session(conn
);
772 struct nlmsghdr
*nlh
;
774 struct iscsi_uevent
*ev
;
775 struct iscsi_internal
*priv
;
776 int len
= NLMSG_SPACE(sizeof(*ev
));
779 priv
= iscsi_if_transport_lookup(conn
->transport
);
783 spin_lock_irqsave(&session
->lock
, flags
);
784 if (session
->state
== ISCSI_SESSION_LOGGED_IN
)
785 session
->state
= ISCSI_SESSION_FAILED
;
786 spin_unlock_irqrestore(&session
->lock
, flags
);
788 skb
= alloc_skb(len
, GFP_ATOMIC
);
790 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: gracefully ignored "
791 "conn error (%d)\n", error
);
795 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
796 ev
= NLMSG_DATA(nlh
);
797 ev
->transport_handle
= iscsi_handle(conn
->transport
);
798 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
799 ev
->r
.connerror
.error
= error
;
800 ev
->r
.connerror
.cid
= conn
->cid
;
801 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
803 iscsi_broadcast_skb(skb
, GFP_ATOMIC
);
805 dev_printk(KERN_INFO
, &conn
->dev
, "iscsi: detected conn error (%d)\n",
808 EXPORT_SYMBOL_GPL(iscsi_conn_error
);
811 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
812 void *payload
, int size
)
815 struct nlmsghdr
*nlh
;
816 int len
= NLMSG_SPACE(size
);
817 int flags
= multi
? NLM_F_MULTI
: 0;
818 int t
= done
? NLMSG_DONE
: type
;
820 skb
= alloc_skb(len
, GFP_ATOMIC
);
822 printk(KERN_ERR
"Could not allocate skb to send reply.\n");
826 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
827 nlh
->nlmsg_flags
= flags
;
828 memcpy(NLMSG_DATA(nlh
), payload
, size
);
829 return iscsi_unicast_skb(skb
, pid
);
833 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
835 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
836 struct iscsi_stats
*stats
;
837 struct sk_buff
*skbstat
;
838 struct iscsi_cls_conn
*conn
;
839 struct nlmsghdr
*nlhstat
;
840 struct iscsi_uevent
*evstat
;
841 struct iscsi_internal
*priv
;
842 int len
= NLMSG_SPACE(sizeof(*ev
) +
843 sizeof(struct iscsi_stats
) +
844 sizeof(struct iscsi_stats_custom
) *
845 ISCSI_STATS_CUSTOM_MAX
);
848 priv
= iscsi_if_transport_lookup(transport
);
852 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
859 skbstat
= alloc_skb(len
, GFP_ATOMIC
);
861 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not "
862 "deliver stats: OOM\n");
866 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
867 (len
- sizeof(*nlhstat
)), 0);
868 evstat
= NLMSG_DATA(nlhstat
);
869 memset(evstat
, 0, sizeof(*evstat
));
870 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
871 evstat
->type
= nlh
->nlmsg_type
;
872 evstat
->u
.get_stats
.cid
=
874 evstat
->u
.get_stats
.sid
=
876 stats
= (struct iscsi_stats
*)
877 ((char*)evstat
+ sizeof(*evstat
));
878 memset(stats
, 0, sizeof(*stats
));
880 transport
->get_stats(conn
, stats
);
881 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
882 sizeof(struct iscsi_stats
) +
883 sizeof(struct iscsi_stats_custom
) *
884 stats
->custom_length
);
885 actual_size
-= sizeof(*nlhstat
);
886 actual_size
= NLMSG_LENGTH(actual_size
);
887 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
888 nlhstat
->nlmsg_len
= actual_size
;
890 err
= iscsi_unicast_skb(skbstat
, priv
->daemon_pid
);
891 } while (err
< 0 && err
!= -ECONNREFUSED
);
897 * iscsi_session_event - send session destr. completion event
898 * @session: iscsi class session
899 * @event: type of event
901 int iscsi_session_event(struct iscsi_cls_session
*session
,
902 enum iscsi_uevent_e event
)
904 struct iscsi_internal
*priv
;
905 struct Scsi_Host
*shost
;
906 struct iscsi_uevent
*ev
;
908 struct nlmsghdr
*nlh
;
909 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
911 priv
= iscsi_if_transport_lookup(session
->transport
);
914 shost
= iscsi_session_to_shost(session
);
916 skb
= alloc_skb(len
, GFP_KERNEL
);
918 dev_printk(KERN_ERR
, &session
->dev
, "Cannot notify userspace "
919 "of session event %u\n", event
);
923 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
924 ev
= NLMSG_DATA(nlh
);
925 ev
->transport_handle
= iscsi_handle(session
->transport
);
929 case ISCSI_KEVENT_DESTROY_SESSION
:
930 ev
->r
.d_session
.host_no
= shost
->host_no
;
931 ev
->r
.d_session
.sid
= session
->sid
;
933 case ISCSI_KEVENT_CREATE_SESSION
:
934 ev
->r
.c_session_ret
.host_no
= shost
->host_no
;
935 ev
->r
.c_session_ret
.sid
= session
->sid
;
937 case ISCSI_KEVENT_UNBIND_SESSION
:
938 ev
->r
.unbind_session
.host_no
= shost
->host_no
;
939 ev
->r
.unbind_session
.sid
= session
->sid
;
942 dev_printk(KERN_ERR
, &session
->dev
, "Invalid event %u.\n",
949 * this will occur if the daemon is not up, so we just warn
950 * the user and when the daemon is restarted it will handle it
952 rc
= iscsi_broadcast_skb(skb
, GFP_KERNEL
);
954 dev_printk(KERN_ERR
, &session
->dev
, "Cannot notify userspace "
955 "of session event %u. Check iscsi daemon\n", event
);
958 EXPORT_SYMBOL_GPL(iscsi_session_event
);
961 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_uevent
*ev
)
963 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
964 struct iscsi_cls_session
*session
;
967 session
= transport
->create_session(transport
, &priv
->t
,
968 ev
->u
.c_session
.cmds_max
,
969 ev
->u
.c_session
.queue_depth
,
970 ev
->u
.c_session
.initial_cmdsn
,
975 ev
->r
.c_session_ret
.host_no
= hostno
;
976 ev
->r
.c_session_ret
.sid
= session
->sid
;
981 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
983 struct iscsi_cls_conn
*conn
;
984 struct iscsi_cls_session
*session
;
986 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
988 printk(KERN_ERR
"iscsi: invalid session %d\n",
993 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
995 printk(KERN_ERR
"iscsi: couldn't create a new "
996 "connection for session %d\n",
1001 ev
->r
.c_conn_ret
.sid
= session
->sid
;
1002 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
1007 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1009 struct iscsi_cls_conn
*conn
;
1011 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
1015 if (transport
->destroy_conn
)
1016 transport
->destroy_conn(conn
);
1021 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1023 char *data
= (char*)ev
+ sizeof(*ev
);
1024 struct iscsi_cls_conn
*conn
;
1025 struct iscsi_cls_session
*session
;
1026 int err
= 0, value
= 0;
1028 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
1029 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
1030 if (!conn
|| !session
)
1033 switch (ev
->u
.set_param
.param
) {
1034 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
1035 sscanf(data
, "%d", &value
);
1037 session
->recovery_tmo
= value
;
1040 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
,
1041 data
, ev
->u
.set_param
.len
);
1048 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
1049 struct iscsi_uevent
*ev
, int msg_type
)
1051 struct sockaddr
*dst_addr
;
1055 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1056 if (!transport
->ep_connect
)
1059 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1060 rc
= transport
->ep_connect(dst_addr
,
1061 ev
->u
.ep_connect
.non_blocking
,
1062 &ev
->r
.ep_connect_ret
.handle
);
1064 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1065 if (!transport
->ep_poll
)
1068 ev
->r
.retcode
= transport
->ep_poll(ev
->u
.ep_poll
.ep_handle
,
1069 ev
->u
.ep_poll
.timeout_ms
);
1071 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1072 if (!transport
->ep_disconnect
)
1075 transport
->ep_disconnect(ev
->u
.ep_disconnect
.ep_handle
);
1082 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
1083 struct iscsi_uevent
*ev
)
1085 struct Scsi_Host
*shost
;
1086 struct sockaddr
*dst_addr
;
1089 if (!transport
->tgt_dscvr
)
1092 shost
= scsi_host_lookup(ev
->u
.tgt_dscvr
.host_no
);
1093 if (IS_ERR(shost
)) {
1094 printk(KERN_ERR
"target discovery could not find host no %u\n",
1095 ev
->u
.tgt_dscvr
.host_no
);
1100 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1101 err
= transport
->tgt_dscvr(shost
, ev
->u
.tgt_dscvr
.type
,
1102 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
1103 scsi_host_put(shost
);
1108 iscsi_set_host_param(struct iscsi_transport
*transport
,
1109 struct iscsi_uevent
*ev
)
1111 char *data
= (char*)ev
+ sizeof(*ev
);
1112 struct Scsi_Host
*shost
;
1115 if (!transport
->set_host_param
)
1118 shost
= scsi_host_lookup(ev
->u
.set_host_param
.host_no
);
1119 if (IS_ERR(shost
)) {
1120 printk(KERN_ERR
"set_host_param could not find host no %u\n",
1121 ev
->u
.set_host_param
.host_no
);
1125 err
= transport
->set_host_param(shost
, ev
->u
.set_host_param
.param
,
1126 data
, ev
->u
.set_host_param
.len
);
1127 scsi_host_put(shost
);
1132 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
1135 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1136 struct iscsi_transport
*transport
= NULL
;
1137 struct iscsi_internal
*priv
;
1138 struct iscsi_cls_session
*session
;
1139 struct iscsi_cls_conn
*conn
;
1141 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
1144 transport
= priv
->iscsi_transport
;
1146 if (!try_module_get(transport
->owner
))
1149 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1151 switch (nlh
->nlmsg_type
) {
1152 case ISCSI_UEVENT_CREATE_SESSION
:
1153 err
= iscsi_if_create_session(priv
, ev
);
1155 case ISCSI_UEVENT_DESTROY_SESSION
:
1156 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1158 transport
->destroy_session(session
);
1162 case ISCSI_UEVENT_UNBIND_SESSION
:
1163 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1165 iscsi_unbind_session(session
);
1169 case ISCSI_UEVENT_CREATE_CONN
:
1170 err
= iscsi_if_create_conn(transport
, ev
);
1172 case ISCSI_UEVENT_DESTROY_CONN
:
1173 err
= iscsi_if_destroy_conn(transport
, ev
);
1175 case ISCSI_UEVENT_BIND_CONN
:
1176 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1177 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1179 if (session
&& conn
)
1180 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1181 ev
->u
.b_conn
.transport_eph
,
1182 ev
->u
.b_conn
.is_leading
);
1186 case ISCSI_UEVENT_SET_PARAM
:
1187 err
= iscsi_set_param(transport
, ev
);
1189 case ISCSI_UEVENT_START_CONN
:
1190 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1192 ev
->r
.retcode
= transport
->start_conn(conn
);
1196 case ISCSI_UEVENT_STOP_CONN
:
1197 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1199 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1203 case ISCSI_UEVENT_SEND_PDU
:
1204 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1206 ev
->r
.retcode
= transport
->send_pdu(conn
,
1207 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1208 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1209 ev
->u
.send_pdu
.data_size
);
1213 case ISCSI_UEVENT_GET_STATS
:
1214 err
= iscsi_if_get_stats(transport
, nlh
);
1216 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1217 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1218 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1219 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1221 case ISCSI_UEVENT_TGT_DSCVR
:
1222 err
= iscsi_tgt_dscvr(transport
, ev
);
1224 case ISCSI_UEVENT_SET_HOST_PARAM
:
1225 err
= iscsi_set_host_param(transport
, ev
);
1232 module_put(transport
->owner
);
1237 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1238 * Malformed skbs with wrong lengths or invalid creds are not processed.
1241 iscsi_if_rx(struct sk_buff
*skb
)
1243 mutex_lock(&rx_queue_mutex
);
1244 while (skb
->len
>= NLMSG_SPACE(0)) {
1247 struct nlmsghdr
*nlh
;
1248 struct iscsi_uevent
*ev
;
1250 nlh
= nlmsg_hdr(skb
);
1251 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1252 skb
->len
< nlh
->nlmsg_len
) {
1256 ev
= NLMSG_DATA(nlh
);
1257 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1258 if (rlen
> skb
->len
)
1261 err
= iscsi_if_recv_msg(skb
, nlh
);
1263 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1268 * special case for GET_STATS:
1269 * on success - sending reply and stats from
1270 * inside of if_recv_msg(),
1271 * on error - fall through.
1273 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1275 err
= iscsi_if_send_reply(
1276 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1277 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1278 } while (err
< 0 && err
!= -ECONNREFUSED
);
1279 skb_pull(skb
, rlen
);
1281 mutex_unlock(&rx_queue_mutex
);
1284 #define iscsi_cdev_to_conn(_cdev) \
1285 iscsi_dev_to_conn(_cdev->dev)
1287 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1288 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1289 __ATTR(_name,_mode,_show,_store)
1292 * iSCSI connection attrs
1294 #define iscsi_conn_attr_show(param) \
1296 show_conn_param_##param(struct class_device *cdev, char *buf) \
1298 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1299 struct iscsi_transport *t = conn->transport; \
1300 return t->get_conn_param(conn, param, buf); \
1303 #define iscsi_conn_attr(field, param) \
1304 iscsi_conn_attr_show(param) \
1305 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1308 iscsi_conn_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
);
1309 iscsi_conn_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
);
1310 iscsi_conn_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
);
1311 iscsi_conn_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
);
1312 iscsi_conn_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
);
1313 iscsi_conn_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
);
1314 iscsi_conn_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
);
1315 iscsi_conn_attr(port
, ISCSI_PARAM_CONN_PORT
);
1316 iscsi_conn_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
);
1317 iscsi_conn_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1318 iscsi_conn_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1319 iscsi_conn_attr(ping_tmo
, ISCSI_PARAM_PING_TMO
);
1320 iscsi_conn_attr(recv_tmo
, ISCSI_PARAM_RECV_TMO
);
1322 #define iscsi_cdev_to_session(_cdev) \
1323 iscsi_dev_to_session(_cdev->dev)
1326 * iSCSI session attrs
1328 #define iscsi_session_attr_show(param, perm) \
1330 show_session_param_##param(struct class_device *cdev, char *buf) \
1332 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1333 struct iscsi_transport *t = session->transport; \
1335 if (perm && !capable(CAP_SYS_ADMIN)) \
1337 return t->get_session_param(session, param, buf); \
1340 #define iscsi_session_attr(field, param, perm) \
1341 iscsi_session_attr_show(param, perm) \
1342 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1345 iscsi_session_attr(targetname
, ISCSI_PARAM_TARGET_NAME
, 0);
1346 iscsi_session_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
, 0);
1347 iscsi_session_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
, 0);
1348 iscsi_session_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
, 0);
1349 iscsi_session_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
, 0);
1350 iscsi_session_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
, 0);
1351 iscsi_session_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
, 0);
1352 iscsi_session_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
, 0);
1353 iscsi_session_attr(erl
, ISCSI_PARAM_ERL
, 0);
1354 iscsi_session_attr(tpgt
, ISCSI_PARAM_TPGT
, 0);
1355 iscsi_session_attr(username
, ISCSI_PARAM_USERNAME
, 1);
1356 iscsi_session_attr(username_in
, ISCSI_PARAM_USERNAME_IN
, 1);
1357 iscsi_session_attr(password
, ISCSI_PARAM_PASSWORD
, 1);
1358 iscsi_session_attr(password_in
, ISCSI_PARAM_PASSWORD_IN
, 1);
1359 iscsi_session_attr(fast_abort
, ISCSI_PARAM_FAST_ABORT
, 0);
1360 iscsi_session_attr(abort_tmo
, ISCSI_PARAM_ABORT_TMO
, 0);
1361 iscsi_session_attr(lu_reset_tmo
, ISCSI_PARAM_LU_RESET_TMO
, 0);
1364 show_priv_session_state(struct class_device
*cdev
, char *buf
)
1366 struct iscsi_cls_session
*session
= iscsi_cdev_to_session(cdev
);
1367 return sprintf(buf
, "%s\n", iscsi_session_state_name(session
->state
));
1369 static ISCSI_CLASS_ATTR(priv_sess
, state
, S_IRUGO
, show_priv_session_state
,
1372 #define iscsi_priv_session_attr_show(field, format) \
1374 show_priv_session_##field(struct class_device *cdev, char *buf) \
1376 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\
1377 return sprintf(buf, format"\n", session->field); \
1380 #define iscsi_priv_session_attr(field, format) \
1381 iscsi_priv_session_attr_show(field, format) \
1382 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1384 iscsi_priv_session_attr(recovery_tmo
, "%d");
1389 #define iscsi_host_attr_show(param) \
1391 show_host_param_##param(struct class_device *cdev, char *buf) \
1393 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
1394 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1395 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1398 #define iscsi_host_attr(field, param) \
1399 iscsi_host_attr_show(param) \
1400 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1403 iscsi_host_attr(netdev
, ISCSI_HOST_PARAM_NETDEV_NAME
);
1404 iscsi_host_attr(hwaddress
, ISCSI_HOST_PARAM_HWADDRESS
);
1405 iscsi_host_attr(ipaddress
, ISCSI_HOST_PARAM_IPADDRESS
);
1406 iscsi_host_attr(initiatorname
, ISCSI_HOST_PARAM_INITIATOR_NAME
);
1408 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1410 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1415 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1417 if (tt->param_mask & param_flag) { \
1418 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1423 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1425 if (tt->param_mask & param_flag) { \
1426 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1431 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1433 if (tt->host_param_mask & param_flag) { \
1434 priv->host_attrs[count] = &class_device_attr_host_##field; \
1439 static int iscsi_session_match(struct attribute_container
*cont
,
1442 struct iscsi_cls_session
*session
;
1443 struct Scsi_Host
*shost
;
1444 struct iscsi_internal
*priv
;
1446 if (!iscsi_is_session_dev(dev
))
1449 session
= iscsi_dev_to_session(dev
);
1450 shost
= iscsi_session_to_shost(session
);
1451 if (!shost
->transportt
)
1454 priv
= to_iscsi_internal(shost
->transportt
);
1455 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1458 return &priv
->session_cont
.ac
== cont
;
1461 static int iscsi_conn_match(struct attribute_container
*cont
,
1464 struct iscsi_cls_session
*session
;
1465 struct iscsi_cls_conn
*conn
;
1466 struct Scsi_Host
*shost
;
1467 struct iscsi_internal
*priv
;
1469 if (!iscsi_is_conn_dev(dev
))
1472 conn
= iscsi_dev_to_conn(dev
);
1473 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1474 shost
= iscsi_session_to_shost(session
);
1476 if (!shost
->transportt
)
1479 priv
= to_iscsi_internal(shost
->transportt
);
1480 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1483 return &priv
->conn_cont
.ac
== cont
;
1486 static int iscsi_host_match(struct attribute_container
*cont
,
1489 struct Scsi_Host
*shost
;
1490 struct iscsi_internal
*priv
;
1492 if (!scsi_is_host_device(dev
))
1495 shost
= dev_to_shost(dev
);
1496 if (!shost
->transportt
||
1497 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1500 priv
= to_iscsi_internal(shost
->transportt
);
1501 return &priv
->t
.host_attrs
.ac
== cont
;
1504 struct scsi_transport_template
*
1505 iscsi_register_transport(struct iscsi_transport
*tt
)
1507 struct iscsi_internal
*priv
;
1508 unsigned long flags
;
1513 priv
= iscsi_if_transport_lookup(tt
);
1517 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1520 INIT_LIST_HEAD(&priv
->list
);
1521 priv
->daemon_pid
= -1;
1522 priv
->iscsi_transport
= tt
;
1523 priv
->t
.user_scan
= iscsi_user_scan
;
1525 priv
->cdev
.class = &iscsi_transport_class
;
1526 snprintf(priv
->cdev
.class_id
, BUS_ID_SIZE
, "%s", tt
->name
);
1527 err
= class_device_register(&priv
->cdev
);
1531 err
= sysfs_create_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1533 goto unregister_cdev
;
1535 /* host parameters */
1536 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1537 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1538 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1539 priv
->t
.host_size
= sizeof(struct iscsi_host
);
1540 transport_container_register(&priv
->t
.host_attrs
);
1542 SETUP_HOST_RD_ATTR(netdev
, ISCSI_HOST_NETDEV_NAME
);
1543 SETUP_HOST_RD_ATTR(ipaddress
, ISCSI_HOST_IPADDRESS
);
1544 SETUP_HOST_RD_ATTR(hwaddress
, ISCSI_HOST_HWADDRESS
);
1545 SETUP_HOST_RD_ATTR(initiatorname
, ISCSI_HOST_INITIATOR_NAME
);
1546 BUG_ON(count
> ISCSI_HOST_ATTRS
);
1547 priv
->host_attrs
[count
] = NULL
;
1550 /* connection parameters */
1551 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1552 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1553 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1554 transport_container_register(&priv
->conn_cont
);
1556 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1557 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1558 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1559 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1560 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1561 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1562 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1563 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1564 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1565 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1566 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1567 SETUP_CONN_RD_ATTR(ping_tmo
, ISCSI_PING_TMO
);
1568 SETUP_CONN_RD_ATTR(recv_tmo
, ISCSI_RECV_TMO
);
1570 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1571 priv
->conn_attrs
[count
] = NULL
;
1574 /* session parameters */
1575 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1576 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1577 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1578 transport_container_register(&priv
->session_cont
);
1580 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1581 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1582 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1583 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1584 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1585 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1586 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1587 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1588 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1589 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1590 SETUP_SESSION_RD_ATTR(password
, ISCSI_USERNAME
);
1591 SETUP_SESSION_RD_ATTR(password_in
, ISCSI_USERNAME_IN
);
1592 SETUP_SESSION_RD_ATTR(username
, ISCSI_PASSWORD
);
1593 SETUP_SESSION_RD_ATTR(username_in
, ISCSI_PASSWORD_IN
);
1594 SETUP_SESSION_RD_ATTR(fast_abort
, ISCSI_FAST_ABORT
);
1595 SETUP_SESSION_RD_ATTR(abort_tmo
, ISCSI_ABORT_TMO
);
1596 SETUP_SESSION_RD_ATTR(lu_reset_tmo
,ISCSI_LU_RESET_TMO
);
1597 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1598 SETUP_PRIV_SESSION_RD_ATTR(state
);
1600 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1601 priv
->session_attrs
[count
] = NULL
;
1603 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1604 list_add(&priv
->list
, &iscsi_transports
);
1605 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1607 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1611 class_device_unregister(&priv
->cdev
);
1616 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1618 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1620 struct iscsi_internal
*priv
;
1621 unsigned long flags
;
1625 mutex_lock(&rx_queue_mutex
);
1627 priv
= iscsi_if_transport_lookup(tt
);
1630 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1631 list_del(&priv
->list
);
1632 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1634 transport_container_unregister(&priv
->conn_cont
);
1635 transport_container_unregister(&priv
->session_cont
);
1636 transport_container_unregister(&priv
->t
.host_attrs
);
1638 sysfs_remove_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1639 class_device_unregister(&priv
->cdev
);
1640 mutex_unlock(&rx_queue_mutex
);
1644 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1646 static __init
int iscsi_transport_init(void)
1650 printk(KERN_INFO
"Loading iSCSI transport class v%s.\n",
1651 ISCSI_TRANSPORT_VERSION
);
1653 atomic_set(&iscsi_session_nr
, 0);
1655 err
= class_register(&iscsi_transport_class
);
1659 err
= transport_class_register(&iscsi_host_class
);
1661 goto unregister_transport_class
;
1663 err
= transport_class_register(&iscsi_connection_class
);
1665 goto unregister_host_class
;
1667 err
= transport_class_register(&iscsi_session_class
);
1669 goto unregister_conn_class
;
1671 nls
= netlink_kernel_create(&init_net
, NETLINK_ISCSI
, 1, iscsi_if_rx
, NULL
,
1675 goto unregister_session_class
;
1678 iscsi_eh_timer_workq
= create_singlethread_workqueue("iscsi_eh");
1679 if (!iscsi_eh_timer_workq
)
1685 netlink_kernel_release(nls
);
1686 unregister_session_class
:
1687 transport_class_unregister(&iscsi_session_class
);
1688 unregister_conn_class
:
1689 transport_class_unregister(&iscsi_connection_class
);
1690 unregister_host_class
:
1691 transport_class_unregister(&iscsi_host_class
);
1692 unregister_transport_class
:
1693 class_unregister(&iscsi_transport_class
);
1697 static void __exit
iscsi_transport_exit(void)
1699 destroy_workqueue(iscsi_eh_timer_workq
);
1700 netlink_kernel_release(nls
);
1701 transport_class_unregister(&iscsi_connection_class
);
1702 transport_class_unregister(&iscsi_session_class
);
1703 transport_class_unregister(&iscsi_host_class
);
1704 class_unregister(&iscsi_transport_class
);
1707 module_init(iscsi_transport_init
);
1708 module_exit(iscsi_transport_exit
);
1710 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1711 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1712 "Alex Aizman <itn780@yahoo.com>");
1713 MODULE_DESCRIPTION("iSCSI Transport Interface");
1714 MODULE_LICENSE("GPL");
1715 MODULE_VERSION(ISCSI_TRANSPORT_VERSION
);