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 11
34 #define ISCSI_CONN_ATTRS 11
35 #define ISCSI_HOST_ATTRS 1
36 #define ISCSI_TRANSPORT_VERSION "2.0-724"
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 */
55 * list of registered transports and lock that must
56 * be held while accessing list. The iscsi_transport_lock must
57 * be acquired after the rx_queue_mutex.
59 static LIST_HEAD(iscsi_transports
);
60 static DEFINE_SPINLOCK(iscsi_transport_lock
);
62 #define to_iscsi_internal(tmpl) \
63 container_of(tmpl, struct iscsi_internal, t)
65 #define cdev_to_iscsi_internal(_cdev) \
66 container_of(_cdev, struct iscsi_internal, cdev)
68 static void iscsi_transport_release(struct class_device
*cdev
)
70 struct iscsi_internal
*priv
= cdev_to_iscsi_internal(cdev
);
75 * iscsi_transport_class represents the iscsi_transports that are
78 static struct class iscsi_transport_class
= {
79 .name
= "iscsi_transport",
80 .release
= iscsi_transport_release
,
84 show_transport_handle(struct class_device
*cdev
, char *buf
)
86 struct iscsi_internal
*priv
= cdev_to_iscsi_internal(cdev
);
87 return sprintf(buf
, "%llu\n", (unsigned long long)iscsi_handle(priv
->iscsi_transport
));
89 static CLASS_DEVICE_ATTR(handle
, S_IRUGO
, show_transport_handle
, NULL
);
91 #define show_transport_attr(name, format) \
93 show_transport_##name(struct class_device *cdev, char *buf) \
95 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
96 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
98 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
100 show_transport_attr(caps
, "0x%x");
101 show_transport_attr(max_lun
, "%d");
102 show_transport_attr(max_conn
, "%d");
103 show_transport_attr(max_cmd_len
, "%d");
105 static struct attribute
*iscsi_transport_attrs
[] = {
106 &class_device_attr_handle
.attr
,
107 &class_device_attr_caps
.attr
,
108 &class_device_attr_max_lun
.attr
,
109 &class_device_attr_max_conn
.attr
,
110 &class_device_attr_max_cmd_len
.attr
,
114 static struct attribute_group iscsi_transport_group
= {
115 .attrs
= iscsi_transport_attrs
,
118 static int iscsi_setup_host(struct transport_container
*tc
, struct device
*dev
,
119 struct class_device
*cdev
)
121 struct Scsi_Host
*shost
= dev_to_shost(dev
);
122 struct iscsi_host
*ihost
= shost
->shost_data
;
124 memset(ihost
, 0, sizeof(*ihost
));
125 INIT_LIST_HEAD(&ihost
->sessions
);
126 mutex_init(&ihost
->mutex
);
130 static DECLARE_TRANSPORT_CLASS(iscsi_host_class
,
136 static DECLARE_TRANSPORT_CLASS(iscsi_session_class
,
142 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class
,
148 static struct sock
*nls
;
149 static DEFINE_MUTEX(rx_queue_mutex
);
151 static LIST_HEAD(sesslist
);
152 static DEFINE_SPINLOCK(sesslock
);
153 static LIST_HEAD(connlist
);
154 static DEFINE_SPINLOCK(connlock
);
156 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn
*conn
)
158 struct iscsi_cls_session
*sess
= iscsi_dev_to_session(conn
->dev
.parent
);
163 * Returns the matching session to a given sid
165 static struct iscsi_cls_session
*iscsi_session_lookup(uint32_t sid
)
168 struct iscsi_cls_session
*sess
;
170 spin_lock_irqsave(&sesslock
, flags
);
171 list_for_each_entry(sess
, &sesslist
, sess_list
) {
172 if (sess
->sid
== sid
) {
173 spin_unlock_irqrestore(&sesslock
, flags
);
177 spin_unlock_irqrestore(&sesslock
, flags
);
182 * Returns the matching connection to a given sid / cid tuple
184 static struct iscsi_cls_conn
*iscsi_conn_lookup(uint32_t sid
, uint32_t cid
)
187 struct iscsi_cls_conn
*conn
;
189 spin_lock_irqsave(&connlock
, flags
);
190 list_for_each_entry(conn
, &connlist
, conn_list
) {
191 if ((conn
->cid
== cid
) && (iscsi_conn_get_sid(conn
) == sid
)) {
192 spin_unlock_irqrestore(&connlock
, flags
);
196 spin_unlock_irqrestore(&connlock
, flags
);
201 * The following functions can be used by LLDs that allocate
202 * their own scsi_hosts or by software iscsi LLDs
204 static void iscsi_session_release(struct device
*dev
)
206 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
);
207 struct Scsi_Host
*shost
;
209 shost
= iscsi_session_to_shost(session
);
210 scsi_host_put(shost
);
214 static int iscsi_is_session_dev(const struct device
*dev
)
216 return dev
->release
== iscsi_session_release
;
219 static int iscsi_user_scan(struct Scsi_Host
*shost
, uint channel
,
222 struct iscsi_host
*ihost
= shost
->shost_data
;
223 struct iscsi_cls_session
*session
;
225 mutex_lock(&ihost
->mutex
);
226 list_for_each_entry(session
, &ihost
->sessions
, host_list
) {
227 if ((channel
== SCAN_WILD_CARD
|| channel
== 0) &&
228 (id
== SCAN_WILD_CARD
|| id
== session
->target_id
))
229 scsi_scan_target(&session
->dev
, 0,
230 session
->target_id
, lun
, 1);
232 mutex_unlock(&ihost
->mutex
);
237 static void session_recovery_timedout(struct work_struct
*work
)
239 struct iscsi_cls_session
*session
=
240 container_of(work
, struct iscsi_cls_session
,
243 dev_printk(KERN_INFO
, &session
->dev
, "iscsi: session recovery timed "
244 "out after %d secs\n", session
->recovery_tmo
);
246 if (session
->transport
->session_recovery_timedout
)
247 session
->transport
->session_recovery_timedout(session
);
249 scsi_target_unblock(&session
->dev
);
252 void iscsi_unblock_session(struct iscsi_cls_session
*session
)
254 if (!cancel_delayed_work(&session
->recovery_work
))
255 flush_scheduled_work();
256 scsi_target_unblock(&session
->dev
);
258 EXPORT_SYMBOL_GPL(iscsi_unblock_session
);
260 void iscsi_block_session(struct iscsi_cls_session
*session
)
262 scsi_target_block(&session
->dev
);
263 schedule_delayed_work(&session
->recovery_work
,
264 session
->recovery_tmo
* HZ
);
266 EXPORT_SYMBOL_GPL(iscsi_block_session
);
268 struct iscsi_cls_session
*
269 iscsi_alloc_session(struct Scsi_Host
*shost
,
270 struct iscsi_transport
*transport
)
272 struct iscsi_cls_session
*session
;
274 session
= kzalloc(sizeof(*session
) + transport
->sessiondata_size
,
279 session
->transport
= transport
;
280 session
->recovery_tmo
= 120;
281 INIT_DELAYED_WORK(&session
->recovery_work
, session_recovery_timedout
);
282 INIT_LIST_HEAD(&session
->host_list
);
283 INIT_LIST_HEAD(&session
->sess_list
);
285 /* this is released in the dev's release function */
286 scsi_host_get(shost
);
287 session
->dev
.parent
= &shost
->shost_gendev
;
288 session
->dev
.release
= iscsi_session_release
;
289 device_initialize(&session
->dev
);
290 if (transport
->sessiondata_size
)
291 session
->dd_data
= &session
[1];
294 EXPORT_SYMBOL_GPL(iscsi_alloc_session
);
296 int iscsi_add_session(struct iscsi_cls_session
*session
, unsigned int target_id
)
298 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
299 struct iscsi_host
*ihost
;
302 ihost
= shost
->shost_data
;
303 session
->sid
= atomic_add_return(1, &iscsi_session_nr
);
304 session
->target_id
= target_id
;
306 snprintf(session
->dev
.bus_id
, BUS_ID_SIZE
, "session%u",
308 err
= device_add(&session
->dev
);
310 dev_printk(KERN_ERR
, &session
->dev
, "iscsi: could not "
311 "register session's dev\n");
314 transport_register_device(&session
->dev
);
316 mutex_lock(&ihost
->mutex
);
317 list_add(&session
->host_list
, &ihost
->sessions
);
318 mutex_unlock(&ihost
->mutex
);
322 scsi_host_put(shost
);
325 EXPORT_SYMBOL_GPL(iscsi_add_session
);
328 * iscsi_create_session - create iscsi class session
330 * @transport: iscsi transport
332 * This can be called from a LLD or iscsi_transport.
334 struct iscsi_cls_session
*
335 iscsi_create_session(struct Scsi_Host
*shost
,
336 struct iscsi_transport
*transport
,
337 unsigned int target_id
)
339 struct iscsi_cls_session
*session
;
341 session
= iscsi_alloc_session(shost
, transport
);
345 if (iscsi_add_session(session
, target_id
)) {
346 iscsi_free_session(session
);
351 EXPORT_SYMBOL_GPL(iscsi_create_session
);
353 void iscsi_remove_session(struct iscsi_cls_session
*session
)
355 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
356 struct iscsi_host
*ihost
= shost
->shost_data
;
358 if (!cancel_delayed_work(&session
->recovery_work
))
359 flush_scheduled_work();
361 mutex_lock(&ihost
->mutex
);
362 list_del(&session
->host_list
);
363 mutex_unlock(&ihost
->mutex
);
365 scsi_remove_target(&session
->dev
);
367 transport_unregister_device(&session
->dev
);
368 device_del(&session
->dev
);
370 EXPORT_SYMBOL_GPL(iscsi_remove_session
);
372 void iscsi_free_session(struct iscsi_cls_session
*session
)
374 put_device(&session
->dev
);
377 EXPORT_SYMBOL_GPL(iscsi_free_session
);
380 * iscsi_destroy_session - destroy iscsi session
381 * @session: iscsi_session
383 * Can be called by a LLD or iscsi_transport. There must not be
384 * any running connections.
386 int iscsi_destroy_session(struct iscsi_cls_session
*session
)
388 iscsi_remove_session(session
);
389 iscsi_free_session(session
);
392 EXPORT_SYMBOL_GPL(iscsi_destroy_session
);
394 static void iscsi_conn_release(struct device
*dev
)
396 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
397 struct device
*parent
= conn
->dev
.parent
;
403 static int iscsi_is_conn_dev(const struct device
*dev
)
405 return dev
->release
== iscsi_conn_release
;
409 * iscsi_create_conn - create iscsi class connection
410 * @session: iscsi cls session
411 * @cid: connection id
413 * This can be called from a LLD or iscsi_transport. The connection
414 * is child of the session so cid must be unique for all connections
417 * Since we do not support MCS, cid will normally be zero. In some cases
418 * for software iscsi we could be trying to preallocate a connection struct
419 * in which case there could be two connection structs and cid would be
422 struct iscsi_cls_conn
*
423 iscsi_create_conn(struct iscsi_cls_session
*session
, uint32_t cid
)
425 struct iscsi_transport
*transport
= session
->transport
;
426 struct iscsi_cls_conn
*conn
;
429 conn
= kzalloc(sizeof(*conn
) + transport
->conndata_size
, GFP_KERNEL
);
433 if (transport
->conndata_size
)
434 conn
->dd_data
= &conn
[1];
436 INIT_LIST_HEAD(&conn
->conn_list
);
437 conn
->transport
= transport
;
440 /* this is released in the dev's release function */
441 if (!get_device(&session
->dev
))
444 snprintf(conn
->dev
.bus_id
, BUS_ID_SIZE
, "connection%d:%u",
446 conn
->dev
.parent
= &session
->dev
;
447 conn
->dev
.release
= iscsi_conn_release
;
448 err
= device_register(&conn
->dev
);
450 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: could not register "
451 "connection's dev\n");
452 goto release_parent_ref
;
454 transport_register_device(&conn
->dev
);
458 put_device(&session
->dev
);
464 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
467 * iscsi_destroy_conn - destroy iscsi class connection
468 * @session: iscsi cls session
470 * This can be called from a LLD or iscsi_transport.
472 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
474 transport_unregister_device(&conn
->dev
);
475 device_unregister(&conn
->dev
);
479 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
482 * iscsi interface functions
484 static struct iscsi_internal
*
485 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
487 struct iscsi_internal
*priv
;
490 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
491 list_for_each_entry(priv
, &iscsi_transports
, list
) {
492 if (tt
== priv
->iscsi_transport
) {
493 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
497 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
502 iscsi_broadcast_skb(struct sk_buff
*skb
, gfp_t gfp
)
506 rc
= netlink_broadcast(nls
, skb
, 0, 1, gfp
);
508 printk(KERN_ERR
"iscsi: can not broadcast skb (%d)\n", rc
);
516 iscsi_unicast_skb(struct sk_buff
*skb
, int pid
)
520 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
522 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
529 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
530 char *data
, uint32_t data_size
)
532 struct nlmsghdr
*nlh
;
534 struct iscsi_uevent
*ev
;
536 struct iscsi_internal
*priv
;
537 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
540 priv
= iscsi_if_transport_lookup(conn
->transport
);
544 skb
= alloc_skb(len
, GFP_ATOMIC
);
546 iscsi_conn_error(conn
, ISCSI_ERR_CONN_FAILED
);
547 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not deliver "
548 "control PDU: OOM\n");
552 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
553 ev
= NLMSG_DATA(nlh
);
554 memset(ev
, 0, sizeof(*ev
));
555 ev
->transport_handle
= iscsi_handle(conn
->transport
);
556 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
557 ev
->r
.recv_req
.cid
= conn
->cid
;
558 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
559 pdu
= (char*)ev
+ sizeof(*ev
);
560 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
561 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
563 return iscsi_unicast_skb(skb
, priv
->daemon_pid
);
565 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
567 void iscsi_conn_error(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
569 struct nlmsghdr
*nlh
;
571 struct iscsi_uevent
*ev
;
572 struct iscsi_internal
*priv
;
573 int len
= NLMSG_SPACE(sizeof(*ev
));
575 priv
= iscsi_if_transport_lookup(conn
->transport
);
579 skb
= alloc_skb(len
, GFP_ATOMIC
);
581 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: gracefully ignored "
582 "conn error (%d)\n", error
);
586 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
587 ev
= NLMSG_DATA(nlh
);
588 ev
->transport_handle
= iscsi_handle(conn
->transport
);
589 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
590 ev
->r
.connerror
.error
= error
;
591 ev
->r
.connerror
.cid
= conn
->cid
;
592 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
594 iscsi_broadcast_skb(skb
, GFP_ATOMIC
);
596 dev_printk(KERN_INFO
, &conn
->dev
, "iscsi: detected conn error (%d)\n",
599 EXPORT_SYMBOL_GPL(iscsi_conn_error
);
602 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
603 void *payload
, int size
)
606 struct nlmsghdr
*nlh
;
607 int len
= NLMSG_SPACE(size
);
608 int flags
= multi
? NLM_F_MULTI
: 0;
609 int t
= done
? NLMSG_DONE
: type
;
611 skb
= alloc_skb(len
, GFP_ATOMIC
);
613 printk(KERN_ERR
"Could not allocate skb to send reply.\n");
617 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
618 nlh
->nlmsg_flags
= flags
;
619 memcpy(NLMSG_DATA(nlh
), payload
, size
);
620 return iscsi_unicast_skb(skb
, pid
);
624 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
626 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
627 struct iscsi_stats
*stats
;
628 struct sk_buff
*skbstat
;
629 struct iscsi_cls_conn
*conn
;
630 struct nlmsghdr
*nlhstat
;
631 struct iscsi_uevent
*evstat
;
632 struct iscsi_internal
*priv
;
633 int len
= NLMSG_SPACE(sizeof(*ev
) +
634 sizeof(struct iscsi_stats
) +
635 sizeof(struct iscsi_stats_custom
) *
636 ISCSI_STATS_CUSTOM_MAX
);
639 priv
= iscsi_if_transport_lookup(transport
);
643 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
650 skbstat
= alloc_skb(len
, GFP_ATOMIC
);
652 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not "
653 "deliver stats: OOM\n");
657 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
658 (len
- sizeof(*nlhstat
)), 0);
659 evstat
= NLMSG_DATA(nlhstat
);
660 memset(evstat
, 0, sizeof(*evstat
));
661 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
662 evstat
->type
= nlh
->nlmsg_type
;
663 evstat
->u
.get_stats
.cid
=
665 evstat
->u
.get_stats
.sid
=
667 stats
= (struct iscsi_stats
*)
668 ((char*)evstat
+ sizeof(*evstat
));
669 memset(stats
, 0, sizeof(*stats
));
671 transport
->get_stats(conn
, stats
);
672 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
673 sizeof(struct iscsi_stats
) +
674 sizeof(struct iscsi_stats_custom
) *
675 stats
->custom_length
);
676 actual_size
-= sizeof(*nlhstat
);
677 actual_size
= NLMSG_LENGTH(actual_size
);
678 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
679 nlhstat
->nlmsg_len
= actual_size
;
681 err
= iscsi_unicast_skb(skbstat
, priv
->daemon_pid
);
682 } while (err
< 0 && err
!= -ECONNREFUSED
);
688 * iscsi_if_destroy_session_done - send session destr. completion event
689 * @conn: last connection for session
691 * This is called by HW iscsi LLDs to notify userpsace that its HW has
694 int iscsi_if_destroy_session_done(struct iscsi_cls_conn
*conn
)
696 struct iscsi_internal
*priv
;
697 struct iscsi_cls_session
*session
;
698 struct Scsi_Host
*shost
;
699 struct iscsi_uevent
*ev
;
701 struct nlmsghdr
*nlh
;
703 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
705 priv
= iscsi_if_transport_lookup(conn
->transport
);
709 session
= iscsi_dev_to_session(conn
->dev
.parent
);
710 shost
= iscsi_session_to_shost(session
);
712 skb
= alloc_skb(len
, GFP_KERNEL
);
714 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
715 "session creation event\n");
719 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
720 ev
= NLMSG_DATA(nlh
);
721 ev
->transport_handle
= iscsi_handle(conn
->transport
);
722 ev
->type
= ISCSI_KEVENT_DESTROY_SESSION
;
723 ev
->r
.d_session
.host_no
= shost
->host_no
;
724 ev
->r
.d_session
.sid
= session
->sid
;
727 * this will occur if the daemon is not up, so we just warn
728 * the user and when the daemon is restarted it will handle it
730 rc
= iscsi_broadcast_skb(skb
, GFP_KERNEL
);
732 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
733 "session destruction event. Check iscsi daemon\n");
735 spin_lock_irqsave(&sesslock
, flags
);
736 list_del(&session
->sess_list
);
737 spin_unlock_irqrestore(&sesslock
, flags
);
739 spin_lock_irqsave(&connlock
, flags
);
741 list_del(&conn
->conn_list
);
742 spin_unlock_irqrestore(&connlock
, flags
);
746 EXPORT_SYMBOL_GPL(iscsi_if_destroy_session_done
);
749 * iscsi_if_create_session_done - send session creation completion event
750 * @conn: leading connection for session
752 * This is called by HW iscsi LLDs to notify userpsace that its HW has
753 * created a session or a existing session is back in the logged in state.
755 int iscsi_if_create_session_done(struct iscsi_cls_conn
*conn
)
757 struct iscsi_internal
*priv
;
758 struct iscsi_cls_session
*session
;
759 struct Scsi_Host
*shost
;
760 struct iscsi_uevent
*ev
;
762 struct nlmsghdr
*nlh
;
764 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
766 priv
= iscsi_if_transport_lookup(conn
->transport
);
770 session
= iscsi_dev_to_session(conn
->dev
.parent
);
771 shost
= iscsi_session_to_shost(session
);
773 skb
= alloc_skb(len
, GFP_KERNEL
);
775 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
776 "session creation event\n");
780 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
781 ev
= NLMSG_DATA(nlh
);
782 ev
->transport_handle
= iscsi_handle(conn
->transport
);
783 ev
->type
= ISCSI_UEVENT_CREATE_SESSION
;
784 ev
->r
.c_session_ret
.host_no
= shost
->host_no
;
785 ev
->r
.c_session_ret
.sid
= session
->sid
;
788 * this will occur if the daemon is not up, so we just warn
789 * the user and when the daemon is restarted it will handle it
791 rc
= iscsi_broadcast_skb(skb
, GFP_KERNEL
);
793 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
794 "session creation event. Check iscsi daemon\n");
796 spin_lock_irqsave(&sesslock
, flags
);
797 list_add(&session
->sess_list
, &sesslist
);
798 spin_unlock_irqrestore(&sesslock
, flags
);
800 spin_lock_irqsave(&connlock
, flags
);
801 list_add(&conn
->conn_list
, &connlist
);
803 spin_unlock_irqrestore(&connlock
, flags
);
806 EXPORT_SYMBOL_GPL(iscsi_if_create_session_done
);
809 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_uevent
*ev
)
811 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
812 struct iscsi_cls_session
*session
;
816 session
= transport
->create_session(transport
, &priv
->t
,
817 ev
->u
.c_session
.initial_cmdsn
,
822 spin_lock_irqsave(&sesslock
, flags
);
823 list_add(&session
->sess_list
, &sesslist
);
824 spin_unlock_irqrestore(&sesslock
, flags
);
826 ev
->r
.c_session_ret
.host_no
= hostno
;
827 ev
->r
.c_session_ret
.sid
= session
->sid
;
832 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
834 struct iscsi_cls_conn
*conn
;
835 struct iscsi_cls_session
*session
;
838 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
840 printk(KERN_ERR
"iscsi: invalid session %d\n",
845 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
847 printk(KERN_ERR
"iscsi: couldn't create a new "
848 "connection for session %d\n",
853 ev
->r
.c_conn_ret
.sid
= session
->sid
;
854 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
856 spin_lock_irqsave(&connlock
, flags
);
857 list_add(&conn
->conn_list
, &connlist
);
859 spin_unlock_irqrestore(&connlock
, flags
);
865 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
868 struct iscsi_cls_conn
*conn
;
870 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
873 spin_lock_irqsave(&connlock
, flags
);
875 list_del(&conn
->conn_list
);
876 spin_unlock_irqrestore(&connlock
, flags
);
878 if (transport
->destroy_conn
)
879 transport
->destroy_conn(conn
);
884 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
886 char *data
= (char*)ev
+ sizeof(*ev
);
887 struct iscsi_cls_conn
*conn
;
888 struct iscsi_cls_session
*session
;
889 int err
= 0, value
= 0;
891 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
892 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
893 if (!conn
|| !session
)
896 switch (ev
->u
.set_param
.param
) {
897 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
898 sscanf(data
, "%d", &value
);
900 session
->recovery_tmo
= value
;
903 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
,
904 data
, ev
->u
.set_param
.len
);
911 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
912 struct iscsi_uevent
*ev
, int msg_type
)
914 struct sockaddr
*dst_addr
;
918 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
919 if (!transport
->ep_connect
)
922 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
923 rc
= transport
->ep_connect(dst_addr
,
924 ev
->u
.ep_connect
.non_blocking
,
925 &ev
->r
.ep_connect_ret
.handle
);
927 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
928 if (!transport
->ep_poll
)
931 ev
->r
.retcode
= transport
->ep_poll(ev
->u
.ep_poll
.ep_handle
,
932 ev
->u
.ep_poll
.timeout_ms
);
934 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
935 if (!transport
->ep_disconnect
)
938 transport
->ep_disconnect(ev
->u
.ep_disconnect
.ep_handle
);
945 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
946 struct iscsi_uevent
*ev
)
948 struct Scsi_Host
*shost
;
949 struct sockaddr
*dst_addr
;
952 if (!transport
->tgt_dscvr
)
955 shost
= scsi_host_lookup(ev
->u
.tgt_dscvr
.host_no
);
957 printk(KERN_ERR
"target discovery could not find host no %u\n",
958 ev
->u
.tgt_dscvr
.host_no
);
963 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
964 err
= transport
->tgt_dscvr(shost
, ev
->u
.tgt_dscvr
.type
,
965 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
966 scsi_host_put(shost
);
971 iscsi_set_host_param(struct iscsi_transport
*transport
,
972 struct iscsi_uevent
*ev
)
974 char *data
= (char*)ev
+ sizeof(*ev
);
975 struct Scsi_Host
*shost
;
978 if (!transport
->set_host_param
)
981 shost
= scsi_host_lookup(ev
->u
.set_host_param
.host_no
);
983 printk(KERN_ERR
"set_host_param could not find host no %u\n",
984 ev
->u
.set_host_param
.host_no
);
988 err
= transport
->set_host_param(shost
, ev
->u
.set_host_param
.param
,
989 data
, ev
->u
.set_host_param
.len
);
990 scsi_host_put(shost
);
995 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
998 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
999 struct iscsi_transport
*transport
= NULL
;
1000 struct iscsi_internal
*priv
;
1001 struct iscsi_cls_session
*session
;
1002 struct iscsi_cls_conn
*conn
;
1003 unsigned long flags
;
1005 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
1008 transport
= priv
->iscsi_transport
;
1010 if (!try_module_get(transport
->owner
))
1013 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1015 switch (nlh
->nlmsg_type
) {
1016 case ISCSI_UEVENT_CREATE_SESSION
:
1017 err
= iscsi_if_create_session(priv
, ev
);
1019 case ISCSI_UEVENT_DESTROY_SESSION
:
1020 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1022 spin_lock_irqsave(&sesslock
, flags
);
1023 list_del(&session
->sess_list
);
1024 spin_unlock_irqrestore(&sesslock
, flags
);
1026 transport
->destroy_session(session
);
1030 case ISCSI_UEVENT_CREATE_CONN
:
1031 err
= iscsi_if_create_conn(transport
, ev
);
1033 case ISCSI_UEVENT_DESTROY_CONN
:
1034 err
= iscsi_if_destroy_conn(transport
, ev
);
1036 case ISCSI_UEVENT_BIND_CONN
:
1037 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1038 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1040 if (session
&& conn
)
1041 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1042 ev
->u
.b_conn
.transport_eph
,
1043 ev
->u
.b_conn
.is_leading
);
1047 case ISCSI_UEVENT_SET_PARAM
:
1048 err
= iscsi_set_param(transport
, ev
);
1050 case ISCSI_UEVENT_START_CONN
:
1051 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1053 ev
->r
.retcode
= transport
->start_conn(conn
);
1057 case ISCSI_UEVENT_STOP_CONN
:
1058 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1060 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1064 case ISCSI_UEVENT_SEND_PDU
:
1065 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1067 ev
->r
.retcode
= transport
->send_pdu(conn
,
1068 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1069 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1070 ev
->u
.send_pdu
.data_size
);
1074 case ISCSI_UEVENT_GET_STATS
:
1075 err
= iscsi_if_get_stats(transport
, nlh
);
1077 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1078 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1079 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1080 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1082 case ISCSI_UEVENT_TGT_DSCVR
:
1083 err
= iscsi_tgt_dscvr(transport
, ev
);
1085 case ISCSI_UEVENT_SET_HOST_PARAM
:
1086 err
= iscsi_set_host_param(transport
, ev
);
1093 module_put(transport
->owner
);
1098 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
1099 * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or
1100 * invalid creds are discarded silently.
1103 iscsi_if_rx(struct sock
*sk
, int len
)
1105 struct sk_buff
*skb
;
1107 mutex_lock(&rx_queue_mutex
);
1108 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
1109 if (NETLINK_CREDS(skb
)->uid
) {
1110 skb_pull(skb
, skb
->len
);
1114 while (skb
->len
>= NLMSG_SPACE(0)) {
1117 struct nlmsghdr
*nlh
;
1118 struct iscsi_uevent
*ev
;
1120 nlh
= nlmsg_hdr(skb
);
1121 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1122 skb
->len
< nlh
->nlmsg_len
) {
1126 ev
= NLMSG_DATA(nlh
);
1127 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1128 if (rlen
> skb
->len
)
1131 err
= iscsi_if_recv_msg(skb
, nlh
);
1133 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1138 * special case for GET_STATS:
1139 * on success - sending reply and stats from
1140 * inside of if_recv_msg(),
1141 * on error - fall through.
1143 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1145 err
= iscsi_if_send_reply(
1146 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1147 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1148 } while (err
< 0 && err
!= -ECONNREFUSED
);
1149 skb_pull(skb
, rlen
);
1154 mutex_unlock(&rx_queue_mutex
);
1157 #define iscsi_cdev_to_conn(_cdev) \
1158 iscsi_dev_to_conn(_cdev->dev)
1160 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1161 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1162 __ATTR(_name,_mode,_show,_store)
1165 * iSCSI connection attrs
1167 #define iscsi_conn_attr_show(param) \
1169 show_conn_param_##param(struct class_device *cdev, char *buf) \
1171 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1172 struct iscsi_transport *t = conn->transport; \
1173 return t->get_conn_param(conn, param, buf); \
1176 #define iscsi_conn_attr(field, param) \
1177 iscsi_conn_attr_show(param) \
1178 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1181 iscsi_conn_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
);
1182 iscsi_conn_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
);
1183 iscsi_conn_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
);
1184 iscsi_conn_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
);
1185 iscsi_conn_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
);
1186 iscsi_conn_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
);
1187 iscsi_conn_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
);
1188 iscsi_conn_attr(port
, ISCSI_PARAM_CONN_PORT
);
1189 iscsi_conn_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
);
1190 iscsi_conn_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1191 iscsi_conn_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1193 #define iscsi_cdev_to_session(_cdev) \
1194 iscsi_dev_to_session(_cdev->dev)
1197 * iSCSI session attrs
1199 #define iscsi_session_attr_show(param) \
1201 show_session_param_##param(struct class_device *cdev, char *buf) \
1203 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1204 struct iscsi_transport *t = session->transport; \
1205 return t->get_session_param(session, param, buf); \
1208 #define iscsi_session_attr(field, param) \
1209 iscsi_session_attr_show(param) \
1210 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1213 iscsi_session_attr(targetname
, ISCSI_PARAM_TARGET_NAME
);
1214 iscsi_session_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
);
1215 iscsi_session_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
);
1216 iscsi_session_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
);
1217 iscsi_session_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
);
1218 iscsi_session_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
);
1219 iscsi_session_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
);
1220 iscsi_session_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
);
1221 iscsi_session_attr(erl
, ISCSI_PARAM_ERL
);
1222 iscsi_session_attr(tpgt
, ISCSI_PARAM_TPGT
);
1224 #define iscsi_priv_session_attr_show(field, format) \
1226 show_priv_session_##field(struct class_device *cdev, char *buf) \
1228 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\
1229 return sprintf(buf, format"\n", session->field); \
1232 #define iscsi_priv_session_attr(field, format) \
1233 iscsi_priv_session_attr_show(field, format) \
1234 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1236 iscsi_priv_session_attr(recovery_tmo
, "%d");
1241 #define iscsi_host_attr_show(param) \
1243 show_host_param_##param(struct class_device *cdev, char *buf) \
1245 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
1246 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1247 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1250 #define iscsi_host_attr(field, param) \
1251 iscsi_host_attr_show(param) \
1252 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1255 iscsi_host_attr(hwaddress
, ISCSI_HOST_PARAM_HWADDRESS
);
1257 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1259 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1264 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1266 if (tt->param_mask & param_flag) { \
1267 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1272 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1274 if (tt->param_mask & param_flag) { \
1275 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1280 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1282 if (tt->host_param_mask & param_flag) { \
1283 priv->host_attrs[count] = &class_device_attr_host_##field; \
1288 static int iscsi_session_match(struct attribute_container
*cont
,
1291 struct iscsi_cls_session
*session
;
1292 struct Scsi_Host
*shost
;
1293 struct iscsi_internal
*priv
;
1295 if (!iscsi_is_session_dev(dev
))
1298 session
= iscsi_dev_to_session(dev
);
1299 shost
= iscsi_session_to_shost(session
);
1300 if (!shost
->transportt
)
1303 priv
= to_iscsi_internal(shost
->transportt
);
1304 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1307 return &priv
->session_cont
.ac
== cont
;
1310 static int iscsi_conn_match(struct attribute_container
*cont
,
1313 struct iscsi_cls_session
*session
;
1314 struct iscsi_cls_conn
*conn
;
1315 struct Scsi_Host
*shost
;
1316 struct iscsi_internal
*priv
;
1318 if (!iscsi_is_conn_dev(dev
))
1321 conn
= iscsi_dev_to_conn(dev
);
1322 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1323 shost
= iscsi_session_to_shost(session
);
1325 if (!shost
->transportt
)
1328 priv
= to_iscsi_internal(shost
->transportt
);
1329 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1332 return &priv
->conn_cont
.ac
== cont
;
1335 static int iscsi_host_match(struct attribute_container
*cont
,
1338 struct Scsi_Host
*shost
;
1339 struct iscsi_internal
*priv
;
1341 if (!scsi_is_host_device(dev
))
1344 shost
= dev_to_shost(dev
);
1345 if (!shost
->transportt
||
1346 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1349 priv
= to_iscsi_internal(shost
->transportt
);
1350 return &priv
->t
.host_attrs
.ac
== cont
;
1353 struct scsi_transport_template
*
1354 iscsi_register_transport(struct iscsi_transport
*tt
)
1356 struct iscsi_internal
*priv
;
1357 unsigned long flags
;
1362 priv
= iscsi_if_transport_lookup(tt
);
1366 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1369 INIT_LIST_HEAD(&priv
->list
);
1370 priv
->daemon_pid
= -1;
1371 priv
->iscsi_transport
= tt
;
1372 priv
->t
.user_scan
= iscsi_user_scan
;
1374 priv
->cdev
.class = &iscsi_transport_class
;
1375 snprintf(priv
->cdev
.class_id
, BUS_ID_SIZE
, "%s", tt
->name
);
1376 err
= class_device_register(&priv
->cdev
);
1380 err
= sysfs_create_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1382 goto unregister_cdev
;
1384 /* host parameters */
1385 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1386 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1387 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1388 priv
->t
.host_size
= sizeof(struct iscsi_host
);
1389 transport_container_register(&priv
->t
.host_attrs
);
1391 SETUP_HOST_RD_ATTR(hwaddress
, ISCSI_HOST_HWADDRESS
);
1392 BUG_ON(count
> ISCSI_HOST_ATTRS
);
1393 priv
->host_attrs
[count
] = NULL
;
1396 /* connection parameters */
1397 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1398 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1399 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1400 transport_container_register(&priv
->conn_cont
);
1402 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1403 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1404 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1405 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1406 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1407 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1408 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1409 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1410 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1411 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1412 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1414 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1415 priv
->conn_attrs
[count
] = NULL
;
1418 /* session parameters */
1419 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1420 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1421 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1422 transport_container_register(&priv
->session_cont
);
1424 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1425 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1426 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1427 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1428 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1429 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1430 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1431 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1432 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1433 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1434 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1436 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1437 priv
->session_attrs
[count
] = NULL
;
1439 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1440 list_add(&priv
->list
, &iscsi_transports
);
1441 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1443 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1447 class_device_unregister(&priv
->cdev
);
1452 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1454 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1456 struct iscsi_internal
*priv
;
1457 unsigned long flags
;
1461 mutex_lock(&rx_queue_mutex
);
1463 priv
= iscsi_if_transport_lookup(tt
);
1466 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1467 list_del(&priv
->list
);
1468 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1470 transport_container_unregister(&priv
->conn_cont
);
1471 transport_container_unregister(&priv
->session_cont
);
1472 transport_container_unregister(&priv
->t
.host_attrs
);
1474 sysfs_remove_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1475 class_device_unregister(&priv
->cdev
);
1476 mutex_unlock(&rx_queue_mutex
);
1480 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1482 static __init
int iscsi_transport_init(void)
1486 printk(KERN_INFO
"Loading iSCSI transport class v%s.\n",
1487 ISCSI_TRANSPORT_VERSION
);
1489 atomic_set(&iscsi_session_nr
, 0);
1491 err
= class_register(&iscsi_transport_class
);
1495 err
= transport_class_register(&iscsi_host_class
);
1497 goto unregister_transport_class
;
1499 err
= transport_class_register(&iscsi_connection_class
);
1501 goto unregister_host_class
;
1503 err
= transport_class_register(&iscsi_session_class
);
1505 goto unregister_conn_class
;
1507 nls
= netlink_kernel_create(NETLINK_ISCSI
, 1, iscsi_if_rx
, NULL
,
1511 goto unregister_session_class
;
1516 unregister_session_class
:
1517 transport_class_unregister(&iscsi_session_class
);
1518 unregister_conn_class
:
1519 transport_class_unregister(&iscsi_connection_class
);
1520 unregister_host_class
:
1521 transport_class_unregister(&iscsi_host_class
);
1522 unregister_transport_class
:
1523 class_unregister(&iscsi_transport_class
);
1527 static void __exit
iscsi_transport_exit(void)
1529 sock_release(nls
->sk_socket
);
1530 transport_class_unregister(&iscsi_connection_class
);
1531 transport_class_unregister(&iscsi_session_class
);
1532 transport_class_unregister(&iscsi_host_class
);
1533 class_unregister(&iscsi_transport_class
);
1536 module_init(iscsi_transport_init
);
1537 module_exit(iscsi_transport_exit
);
1539 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1540 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1541 "Alex Aizman <itn780@yahoo.com>");
1542 MODULE_DESCRIPTION("iSCSI Transport Interface");
1543 MODULE_LICENSE("GPL");
1544 MODULE_VERSION(ISCSI_TRANSPORT_VERSION
);