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/mempool.h>
25 #include <linux/mutex.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_iscsi.h>
32 #include <scsi/iscsi_if.h>
34 #define ISCSI_SESSION_ATTRS 11
35 #define ISCSI_CONN_ATTRS 11
36 #define ISCSI_HOST_ATTRS 0
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 int 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 struct mempool_zone
{
156 struct list_head freequeue
;
160 static struct mempool_zone
*z_reply
;
163 * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
164 * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
165 * so daemon will notice OOM on NETLINK tranposrt level and will
166 * be able to predict or change operational behavior
168 #define Z_MAX_REPLY 8
169 #define Z_HIWAT_REPLY 6
171 #define Z_HIWAT_PDU 6
172 #define Z_MAX_ERROR 16
173 #define Z_HIWAT_ERROR 12
175 static LIST_HEAD(sesslist
);
176 static DEFINE_SPINLOCK(sesslock
);
177 static LIST_HEAD(connlist
);
178 static DEFINE_SPINLOCK(connlock
);
180 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn
*conn
)
182 struct iscsi_cls_session
*sess
= iscsi_dev_to_session(conn
->dev
.parent
);
187 * Returns the matching session to a given sid
189 static struct iscsi_cls_session
*iscsi_session_lookup(uint32_t sid
)
192 struct iscsi_cls_session
*sess
;
194 spin_lock_irqsave(&sesslock
, flags
);
195 list_for_each_entry(sess
, &sesslist
, sess_list
) {
196 if (sess
->sid
== sid
) {
197 spin_unlock_irqrestore(&sesslock
, flags
);
201 spin_unlock_irqrestore(&sesslock
, flags
);
206 * Returns the matching connection to a given sid / cid tuple
208 static struct iscsi_cls_conn
*iscsi_conn_lookup(uint32_t sid
, uint32_t cid
)
211 struct iscsi_cls_conn
*conn
;
213 spin_lock_irqsave(&connlock
, flags
);
214 list_for_each_entry(conn
, &connlist
, conn_list
) {
215 if ((conn
->cid
== cid
) && (iscsi_conn_get_sid(conn
) == sid
)) {
216 spin_unlock_irqrestore(&connlock
, flags
);
220 spin_unlock_irqrestore(&connlock
, flags
);
225 * The following functions can be used by LLDs that allocate
226 * their own scsi_hosts or by software iscsi LLDs
228 static void iscsi_session_release(struct device
*dev
)
230 struct iscsi_cls_session
*session
= iscsi_dev_to_session(dev
);
231 struct Scsi_Host
*shost
;
233 shost
= iscsi_session_to_shost(session
);
234 scsi_host_put(shost
);
238 static int iscsi_is_session_dev(const struct device
*dev
)
240 return dev
->release
== iscsi_session_release
;
243 static int iscsi_user_scan(struct Scsi_Host
*shost
, uint channel
,
246 struct iscsi_host
*ihost
= shost
->shost_data
;
247 struct iscsi_cls_session
*session
;
249 mutex_lock(&ihost
->mutex
);
250 list_for_each_entry(session
, &ihost
->sessions
, host_list
) {
251 if ((channel
== SCAN_WILD_CARD
|| channel
== 0) &&
252 (id
== SCAN_WILD_CARD
|| id
== session
->target_id
))
253 scsi_scan_target(&session
->dev
, 0,
254 session
->target_id
, lun
, 1);
256 mutex_unlock(&ihost
->mutex
);
261 static void session_recovery_timedout(void *data
)
263 struct iscsi_cls_session
*session
= data
;
265 dev_printk(KERN_INFO
, &session
->dev
, "iscsi: session recovery timed "
266 "out after %d secs\n", session
->recovery_tmo
);
268 if (session
->transport
->session_recovery_timedout
)
269 session
->transport
->session_recovery_timedout(session
);
271 scsi_target_unblock(&session
->dev
);
274 void iscsi_unblock_session(struct iscsi_cls_session
*session
)
276 if (!cancel_delayed_work(&session
->recovery_work
))
277 flush_scheduled_work();
278 scsi_target_unblock(&session
->dev
);
280 EXPORT_SYMBOL_GPL(iscsi_unblock_session
);
282 void iscsi_block_session(struct iscsi_cls_session
*session
)
284 scsi_target_block(&session
->dev
);
285 schedule_delayed_work(&session
->recovery_work
,
286 session
->recovery_tmo
* HZ
);
288 EXPORT_SYMBOL_GPL(iscsi_block_session
);
290 struct iscsi_cls_session
*
291 iscsi_alloc_session(struct Scsi_Host
*shost
,
292 struct iscsi_transport
*transport
)
294 struct iscsi_cls_session
*session
;
296 session
= kzalloc(sizeof(*session
) + transport
->sessiondata_size
,
301 session
->transport
= transport
;
302 session
->recovery_tmo
= 120;
303 INIT_WORK(&session
->recovery_work
, session_recovery_timedout
, session
);
304 INIT_LIST_HEAD(&session
->host_list
);
305 INIT_LIST_HEAD(&session
->sess_list
);
307 /* this is released in the dev's release function */
308 scsi_host_get(shost
);
309 session
->dev
.parent
= &shost
->shost_gendev
;
310 session
->dev
.release
= iscsi_session_release
;
311 device_initialize(&session
->dev
);
312 if (transport
->sessiondata_size
)
313 session
->dd_data
= &session
[1];
316 EXPORT_SYMBOL_GPL(iscsi_alloc_session
);
318 int iscsi_add_session(struct iscsi_cls_session
*session
, unsigned int target_id
)
320 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
321 struct iscsi_host
*ihost
;
324 ihost
= shost
->shost_data
;
325 session
->sid
= iscsi_session_nr
++;
326 session
->target_id
= target_id
;
328 snprintf(session
->dev
.bus_id
, BUS_ID_SIZE
, "session%u",
330 err
= device_add(&session
->dev
);
332 dev_printk(KERN_ERR
, &session
->dev
, "iscsi: could not "
333 "register session's dev\n");
336 transport_register_device(&session
->dev
);
338 mutex_lock(&ihost
->mutex
);
339 list_add(&session
->host_list
, &ihost
->sessions
);
340 mutex_unlock(&ihost
->mutex
);
344 scsi_host_put(shost
);
347 EXPORT_SYMBOL_GPL(iscsi_add_session
);
350 * iscsi_create_session - create iscsi class session
352 * @transport: iscsi transport
354 * This can be called from a LLD or iscsi_transport.
356 struct iscsi_cls_session
*
357 iscsi_create_session(struct Scsi_Host
*shost
,
358 struct iscsi_transport
*transport
,
359 unsigned int target_id
)
361 struct iscsi_cls_session
*session
;
363 session
= iscsi_alloc_session(shost
, transport
);
367 if (iscsi_add_session(session
, target_id
)) {
368 iscsi_free_session(session
);
373 EXPORT_SYMBOL_GPL(iscsi_create_session
);
375 void iscsi_remove_session(struct iscsi_cls_session
*session
)
377 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
378 struct iscsi_host
*ihost
= shost
->shost_data
;
380 if (!cancel_delayed_work(&session
->recovery_work
))
381 flush_scheduled_work();
383 mutex_lock(&ihost
->mutex
);
384 list_del(&session
->host_list
);
385 mutex_unlock(&ihost
->mutex
);
387 scsi_remove_target(&session
->dev
);
389 transport_unregister_device(&session
->dev
);
390 device_del(&session
->dev
);
392 EXPORT_SYMBOL_GPL(iscsi_remove_session
);
394 void iscsi_free_session(struct iscsi_cls_session
*session
)
396 put_device(&session
->dev
);
399 EXPORT_SYMBOL_GPL(iscsi_free_session
);
402 * iscsi_destroy_session - destroy iscsi session
403 * @session: iscsi_session
405 * Can be called by a LLD or iscsi_transport. There must not be
406 * any running connections.
408 int iscsi_destroy_session(struct iscsi_cls_session
*session
)
410 iscsi_remove_session(session
);
411 iscsi_free_session(session
);
414 EXPORT_SYMBOL_GPL(iscsi_destroy_session
);
416 static void iscsi_conn_release(struct device
*dev
)
418 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
419 struct device
*parent
= conn
->dev
.parent
;
425 static int iscsi_is_conn_dev(const struct device
*dev
)
427 return dev
->release
== iscsi_conn_release
;
431 * iscsi_create_conn - create iscsi class connection
432 * @session: iscsi cls session
433 * @cid: connection id
435 * This can be called from a LLD or iscsi_transport. The connection
436 * is child of the session so cid must be unique for all connections
439 * Since we do not support MCS, cid will normally be zero. In some cases
440 * for software iscsi we could be trying to preallocate a connection struct
441 * in which case there could be two connection structs and cid would be
444 struct iscsi_cls_conn
*
445 iscsi_create_conn(struct iscsi_cls_session
*session
, uint32_t cid
)
447 struct iscsi_transport
*transport
= session
->transport
;
448 struct iscsi_cls_conn
*conn
;
451 conn
= kzalloc(sizeof(*conn
) + transport
->conndata_size
, GFP_KERNEL
);
455 if (transport
->conndata_size
)
456 conn
->dd_data
= &conn
[1];
458 INIT_LIST_HEAD(&conn
->conn_list
);
459 conn
->transport
= transport
;
462 /* this is released in the dev's release function */
463 if (!get_device(&session
->dev
))
466 snprintf(conn
->dev
.bus_id
, BUS_ID_SIZE
, "connection%d:%u",
468 conn
->dev
.parent
= &session
->dev
;
469 conn
->dev
.release
= iscsi_conn_release
;
470 err
= device_register(&conn
->dev
);
472 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: could not register "
473 "connection's dev\n");
474 goto release_parent_ref
;
476 transport_register_device(&conn
->dev
);
480 put_device(&session
->dev
);
486 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
489 * iscsi_destroy_conn - destroy iscsi class connection
490 * @session: iscsi cls session
492 * This can be called from a LLD or iscsi_transport.
494 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
496 transport_unregister_device(&conn
->dev
);
497 device_unregister(&conn
->dev
);
501 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
504 * iscsi interface functions
506 static struct iscsi_internal
*
507 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
509 struct iscsi_internal
*priv
;
512 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
513 list_for_each_entry(priv
, &iscsi_transports
, list
) {
514 if (tt
== priv
->iscsi_transport
) {
515 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
519 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
523 static inline struct list_head
*skb_to_lh(struct sk_buff
*skb
)
525 return (struct list_head
*)&skb
->cb
;
529 mempool_zone_alloc_skb(gfp_t gfp_mask
, void *pool_data
)
531 struct mempool_zone
*zone
= pool_data
;
533 return alloc_skb(zone
->size
, gfp_mask
);
537 mempool_zone_free_skb(void *element
, void *pool_data
)
543 mempool_zone_complete(struct mempool_zone
*zone
)
546 struct list_head
*lh
, *n
;
548 spin_lock_irqsave(&zone
->freelock
, flags
);
549 list_for_each_safe(lh
, n
, &zone
->freequeue
) {
550 struct sk_buff
*skb
= (struct sk_buff
*)((char *)lh
-
551 offsetof(struct sk_buff
, cb
));
552 if (!skb_shared(skb
)) {
553 list_del(skb_to_lh(skb
));
554 mempool_free(skb
, zone
->pool
);
555 atomic_dec(&zone
->allocated
);
558 spin_unlock_irqrestore(&zone
->freelock
, flags
);
561 static struct mempool_zone
*
562 mempool_zone_init(unsigned max
, unsigned size
, unsigned hiwat
)
564 struct mempool_zone
*zp
;
566 zp
= kzalloc(sizeof(*zp
), GFP_KERNEL
);
572 INIT_LIST_HEAD(&zp
->freequeue
);
573 spin_lock_init(&zp
->freelock
);
574 atomic_set(&zp
->allocated
, 0);
576 zp
->pool
= mempool_create(max
, mempool_zone_alloc_skb
,
577 mempool_zone_free_skb
, zp
);
586 static void mempool_zone_destroy(struct mempool_zone
*zp
)
588 mempool_destroy(zp
->pool
);
592 static struct sk_buff
*
593 mempool_zone_get_skb(struct mempool_zone
*zone
)
597 skb
= mempool_alloc(zone
->pool
, GFP_ATOMIC
);
599 atomic_inc(&zone
->allocated
);
604 iscsi_unicast_skb(struct mempool_zone
*zone
, struct sk_buff
*skb
, int pid
)
610 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
612 mempool_free(skb
, zone
->pool
);
613 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
617 spin_lock_irqsave(&zone
->freelock
, flags
);
618 INIT_LIST_HEAD(skb_to_lh(skb
));
619 list_add(skb_to_lh(skb
), &zone
->freequeue
);
620 spin_unlock_irqrestore(&zone
->freelock
, flags
);
625 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
626 char *data
, uint32_t data_size
)
628 struct nlmsghdr
*nlh
;
630 struct iscsi_uevent
*ev
;
632 struct iscsi_internal
*priv
;
633 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
636 priv
= iscsi_if_transport_lookup(conn
->transport
);
640 mempool_zone_complete(conn
->z_pdu
);
642 skb
= mempool_zone_get_skb(conn
->z_pdu
);
644 iscsi_conn_error(conn
, ISCSI_ERR_CONN_FAILED
);
645 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not deliver "
646 "control PDU: OOM\n");
650 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
651 ev
= NLMSG_DATA(nlh
);
652 memset(ev
, 0, sizeof(*ev
));
653 ev
->transport_handle
= iscsi_handle(conn
->transport
);
654 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
655 if (atomic_read(&conn
->z_pdu
->allocated
) >= conn
->z_pdu
->hiwat
)
656 ev
->iferror
= -ENOMEM
;
657 ev
->r
.recv_req
.cid
= conn
->cid
;
658 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
659 pdu
= (char*)ev
+ sizeof(*ev
);
660 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
661 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
663 return iscsi_unicast_skb(conn
->z_pdu
, skb
, priv
->daemon_pid
);
665 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
667 void iscsi_conn_error(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
669 struct nlmsghdr
*nlh
;
671 struct iscsi_uevent
*ev
;
672 struct iscsi_internal
*priv
;
673 int len
= NLMSG_SPACE(sizeof(*ev
));
675 priv
= iscsi_if_transport_lookup(conn
->transport
);
679 mempool_zone_complete(conn
->z_error
);
681 skb
= mempool_zone_get_skb(conn
->z_error
);
683 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: gracefully ignored "
684 "conn error (%d)\n", error
);
688 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
689 ev
= NLMSG_DATA(nlh
);
690 ev
->transport_handle
= iscsi_handle(conn
->transport
);
691 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
692 if (atomic_read(&conn
->z_error
->allocated
) >= conn
->z_error
->hiwat
)
693 ev
->iferror
= -ENOMEM
;
694 ev
->r
.connerror
.error
= error
;
695 ev
->r
.connerror
.cid
= conn
->cid
;
696 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
698 iscsi_unicast_skb(conn
->z_error
, skb
, priv
->daemon_pid
);
700 dev_printk(KERN_INFO
, &conn
->dev
, "iscsi: detected conn error (%d)\n",
703 EXPORT_SYMBOL_GPL(iscsi_conn_error
);
706 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
707 void *payload
, int size
)
710 struct nlmsghdr
*nlh
;
711 int len
= NLMSG_SPACE(size
);
712 int flags
= multi
? NLM_F_MULTI
: 0;
713 int t
= done
? NLMSG_DONE
: type
;
715 mempool_zone_complete(z_reply
);
717 skb
= mempool_zone_get_skb(z_reply
);
720 * user is supposed to react on iferror == -ENOMEM;
725 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
726 nlh
->nlmsg_flags
= flags
;
727 memcpy(NLMSG_DATA(nlh
), payload
, size
);
728 return iscsi_unicast_skb(z_reply
, skb
, pid
);
732 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
734 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
735 struct iscsi_stats
*stats
;
736 struct sk_buff
*skbstat
;
737 struct iscsi_cls_conn
*conn
;
738 struct nlmsghdr
*nlhstat
;
739 struct iscsi_uevent
*evstat
;
740 struct iscsi_internal
*priv
;
741 int len
= NLMSG_SPACE(sizeof(*ev
) +
742 sizeof(struct iscsi_stats
) +
743 sizeof(struct iscsi_stats_custom
) *
744 ISCSI_STATS_CUSTOM_MAX
);
747 priv
= iscsi_if_transport_lookup(transport
);
751 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
758 mempool_zone_complete(conn
->z_pdu
);
760 skbstat
= mempool_zone_get_skb(conn
->z_pdu
);
762 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not "
763 "deliver stats: OOM\n");
767 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
768 (len
- sizeof(*nlhstat
)), 0);
769 evstat
= NLMSG_DATA(nlhstat
);
770 memset(evstat
, 0, sizeof(*evstat
));
771 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
772 evstat
->type
= nlh
->nlmsg_type
;
773 if (atomic_read(&conn
->z_pdu
->allocated
) >= conn
->z_pdu
->hiwat
)
774 evstat
->iferror
= -ENOMEM
;
775 evstat
->u
.get_stats
.cid
=
777 evstat
->u
.get_stats
.sid
=
779 stats
= (struct iscsi_stats
*)
780 ((char*)evstat
+ sizeof(*evstat
));
781 memset(stats
, 0, sizeof(*stats
));
783 transport
->get_stats(conn
, stats
);
784 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
785 sizeof(struct iscsi_stats
) +
786 sizeof(struct iscsi_stats_custom
) *
787 stats
->custom_length
);
788 actual_size
-= sizeof(*nlhstat
);
789 actual_size
= NLMSG_LENGTH(actual_size
);
790 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
791 nlhstat
->nlmsg_len
= actual_size
;
793 err
= iscsi_unicast_skb(conn
->z_pdu
, skbstat
, priv
->daemon_pid
);
794 } while (err
< 0 && err
!= -ECONNREFUSED
);
800 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_uevent
*ev
)
802 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
803 struct iscsi_cls_session
*session
;
807 session
= transport
->create_session(transport
, &priv
->t
,
808 ev
->u
.c_session
.initial_cmdsn
,
813 spin_lock_irqsave(&sesslock
, flags
);
814 list_add(&session
->sess_list
, &sesslist
);
815 spin_unlock_irqrestore(&sesslock
, flags
);
817 ev
->r
.c_session_ret
.host_no
= hostno
;
818 ev
->r
.c_session_ret
.sid
= session
->sid
;
823 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
825 struct iscsi_cls_conn
*conn
;
826 struct iscsi_cls_session
*session
;
829 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
831 printk(KERN_ERR
"iscsi: invalid session %d\n",
836 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
838 printk(KERN_ERR
"iscsi: couldn't create a new "
839 "connection for session %d\n",
844 conn
->z_pdu
= mempool_zone_init(Z_MAX_PDU
,
845 NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
846 sizeof(struct iscsi_hdr
) +
847 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
),
850 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not allocate "
851 "pdu zone for new conn\n");
855 conn
->z_error
= mempool_zone_init(Z_MAX_ERROR
,
856 NLMSG_SPACE(sizeof(struct iscsi_uevent
)),
858 if (!conn
->z_error
) {
859 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not allocate "
860 "error zone for new conn\n");
864 ev
->r
.c_conn_ret
.sid
= session
->sid
;
865 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
867 spin_lock_irqsave(&connlock
, flags
);
868 list_add(&conn
->conn_list
, &connlist
);
870 spin_unlock_irqrestore(&connlock
, flags
);
875 mempool_zone_destroy(conn
->z_pdu
);
877 if (transport
->destroy_conn
)
878 transport
->destroy_conn(conn
->dd_data
);
883 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
886 struct iscsi_cls_conn
*conn
;
887 struct mempool_zone
*z_error
, *z_pdu
;
889 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
892 spin_lock_irqsave(&connlock
, flags
);
894 list_del(&conn
->conn_list
);
895 spin_unlock_irqrestore(&connlock
, flags
);
898 z_error
= conn
->z_error
;
900 if (transport
->destroy_conn
)
901 transport
->destroy_conn(conn
);
903 mempool_zone_destroy(z_pdu
);
904 mempool_zone_destroy(z_error
);
910 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
912 char *data
= (char*)ev
+ sizeof(*ev
);
913 struct iscsi_cls_conn
*conn
;
914 struct iscsi_cls_session
*session
;
915 int err
= 0, value
= 0;
917 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
918 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
919 if (!conn
|| !session
)
922 switch (ev
->u
.set_param
.param
) {
923 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
924 sscanf(data
, "%d", &value
);
926 session
->recovery_tmo
= value
;
929 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
,
930 data
, ev
->u
.set_param
.len
);
937 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
938 struct iscsi_uevent
*ev
, int msg_type
)
940 struct sockaddr
*dst_addr
;
944 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
945 if (!transport
->ep_connect
)
948 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
949 rc
= transport
->ep_connect(dst_addr
,
950 ev
->u
.ep_connect
.non_blocking
,
951 &ev
->r
.ep_connect_ret
.handle
);
953 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
954 if (!transport
->ep_poll
)
957 ev
->r
.retcode
= transport
->ep_poll(ev
->u
.ep_poll
.ep_handle
,
958 ev
->u
.ep_poll
.timeout_ms
);
960 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
961 if (!transport
->ep_disconnect
)
964 transport
->ep_disconnect(ev
->u
.ep_disconnect
.ep_handle
);
971 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
972 struct iscsi_uevent
*ev
)
974 struct sockaddr
*dst_addr
;
976 if (!transport
->tgt_dscvr
)
979 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
980 return transport
->tgt_dscvr(ev
->u
.tgt_dscvr
.type
,
981 ev
->u
.tgt_dscvr
.host_no
,
982 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
986 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
989 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
990 struct iscsi_transport
*transport
= NULL
;
991 struct iscsi_internal
*priv
;
992 struct iscsi_cls_session
*session
;
993 struct iscsi_cls_conn
*conn
;
996 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
999 transport
= priv
->iscsi_transport
;
1001 if (!try_module_get(transport
->owner
))
1004 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1006 switch (nlh
->nlmsg_type
) {
1007 case ISCSI_UEVENT_CREATE_SESSION
:
1008 err
= iscsi_if_create_session(priv
, ev
);
1010 case ISCSI_UEVENT_DESTROY_SESSION
:
1011 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1013 spin_lock_irqsave(&sesslock
, flags
);
1014 list_del(&session
->sess_list
);
1015 spin_unlock_irqrestore(&sesslock
, flags
);
1017 transport
->destroy_session(session
);
1021 case ISCSI_UEVENT_CREATE_CONN
:
1022 err
= iscsi_if_create_conn(transport
, ev
);
1024 case ISCSI_UEVENT_DESTROY_CONN
:
1025 err
= iscsi_if_destroy_conn(transport
, ev
);
1027 case ISCSI_UEVENT_BIND_CONN
:
1028 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1029 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1031 if (session
&& conn
)
1032 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1033 ev
->u
.b_conn
.transport_eph
,
1034 ev
->u
.b_conn
.is_leading
);
1038 case ISCSI_UEVENT_SET_PARAM
:
1039 err
= iscsi_set_param(transport
, ev
);
1041 case ISCSI_UEVENT_START_CONN
:
1042 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1044 ev
->r
.retcode
= transport
->start_conn(conn
);
1048 case ISCSI_UEVENT_STOP_CONN
:
1049 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1051 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1055 case ISCSI_UEVENT_SEND_PDU
:
1056 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1058 ev
->r
.retcode
= transport
->send_pdu(conn
,
1059 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1060 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1061 ev
->u
.send_pdu
.data_size
);
1065 case ISCSI_UEVENT_GET_STATS
:
1066 err
= iscsi_if_get_stats(transport
, nlh
);
1068 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1069 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1070 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1071 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1073 case ISCSI_UEVENT_TGT_DSCVR
:
1074 err
= iscsi_tgt_dscvr(transport
, ev
);
1081 module_put(transport
->owner
);
1086 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
1087 * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or
1088 * invalid creds are discarded silently.
1091 iscsi_if_rx(struct sock
*sk
, int len
)
1093 struct sk_buff
*skb
;
1095 mutex_lock(&rx_queue_mutex
);
1096 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
1097 if (NETLINK_CREDS(skb
)->uid
) {
1098 skb_pull(skb
, skb
->len
);
1102 while (skb
->len
>= NLMSG_SPACE(0)) {
1105 struct nlmsghdr
*nlh
;
1106 struct iscsi_uevent
*ev
;
1108 nlh
= (struct nlmsghdr
*)skb
->data
;
1109 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1110 skb
->len
< nlh
->nlmsg_len
) {
1114 ev
= NLMSG_DATA(nlh
);
1115 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1116 if (rlen
> skb
->len
)
1119 err
= iscsi_if_recv_msg(skb
, nlh
);
1121 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1126 * special case for GET_STATS:
1127 * on success - sending reply and stats from
1128 * inside of if_recv_msg(),
1129 * on error - fall through.
1131 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1133 err
= iscsi_if_send_reply(
1134 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1135 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1136 if (atomic_read(&z_reply
->allocated
) >=
1138 ev
->iferror
= -ENOMEM
;
1139 } while (err
< 0 && err
!= -ECONNREFUSED
);
1140 skb_pull(skb
, rlen
);
1145 mutex_unlock(&rx_queue_mutex
);
1148 #define iscsi_cdev_to_conn(_cdev) \
1149 iscsi_dev_to_conn(_cdev->dev)
1151 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1152 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1153 __ATTR(_name,_mode,_show,_store)
1156 * iSCSI connection attrs
1158 #define iscsi_conn_attr_show(param) \
1160 show_conn_param_##param(struct class_device *cdev, char *buf) \
1162 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1163 struct iscsi_transport *t = conn->transport; \
1164 return t->get_conn_param(conn, param, buf); \
1167 #define iscsi_conn_attr(field, param) \
1168 iscsi_conn_attr_show(param) \
1169 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1172 iscsi_conn_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
);
1173 iscsi_conn_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
);
1174 iscsi_conn_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
);
1175 iscsi_conn_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
);
1176 iscsi_conn_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
);
1177 iscsi_conn_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
);
1178 iscsi_conn_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
);
1179 iscsi_conn_attr(port
, ISCSI_PARAM_CONN_PORT
);
1180 iscsi_conn_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
);
1181 iscsi_conn_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1182 iscsi_conn_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1184 #define iscsi_cdev_to_session(_cdev) \
1185 iscsi_dev_to_session(_cdev->dev)
1188 * iSCSI session attrs
1190 #define iscsi_session_attr_show(param) \
1192 show_session_param_##param(struct class_device *cdev, char *buf) \
1194 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1195 struct iscsi_transport *t = session->transport; \
1196 return t->get_session_param(session, param, buf); \
1199 #define iscsi_session_attr(field, param) \
1200 iscsi_session_attr_show(param) \
1201 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1204 iscsi_session_attr(targetname
, ISCSI_PARAM_TARGET_NAME
);
1205 iscsi_session_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
);
1206 iscsi_session_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
);
1207 iscsi_session_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
);
1208 iscsi_session_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
);
1209 iscsi_session_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
);
1210 iscsi_session_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
);
1211 iscsi_session_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
);
1212 iscsi_session_attr(erl
, ISCSI_PARAM_ERL
);
1213 iscsi_session_attr(tpgt
, ISCSI_PARAM_TPGT
);
1215 #define iscsi_priv_session_attr_show(field, format) \
1217 show_priv_session_##field(struct class_device *cdev, char *buf) \
1219 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\
1220 return sprintf(buf, format"\n", session->field); \
1223 #define iscsi_priv_session_attr(field, format) \
1224 iscsi_priv_session_attr_show(field, format) \
1225 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1227 iscsi_priv_session_attr(recovery_tmo
, "%d");
1229 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1231 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1236 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1238 if (tt->param_mask & param_flag) { \
1239 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1244 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1246 if (tt->param_mask & param_flag) { \
1247 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1252 static int iscsi_session_match(struct attribute_container
*cont
,
1255 struct iscsi_cls_session
*session
;
1256 struct Scsi_Host
*shost
;
1257 struct iscsi_internal
*priv
;
1259 if (!iscsi_is_session_dev(dev
))
1262 session
= iscsi_dev_to_session(dev
);
1263 shost
= iscsi_session_to_shost(session
);
1264 if (!shost
->transportt
)
1267 priv
= to_iscsi_internal(shost
->transportt
);
1268 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1271 return &priv
->session_cont
.ac
== cont
;
1274 static int iscsi_conn_match(struct attribute_container
*cont
,
1277 struct iscsi_cls_session
*session
;
1278 struct iscsi_cls_conn
*conn
;
1279 struct Scsi_Host
*shost
;
1280 struct iscsi_internal
*priv
;
1282 if (!iscsi_is_conn_dev(dev
))
1285 conn
= iscsi_dev_to_conn(dev
);
1286 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1287 shost
= iscsi_session_to_shost(session
);
1289 if (!shost
->transportt
)
1292 priv
= to_iscsi_internal(shost
->transportt
);
1293 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1296 return &priv
->conn_cont
.ac
== cont
;
1299 static int iscsi_host_match(struct attribute_container
*cont
,
1302 struct Scsi_Host
*shost
;
1303 struct iscsi_internal
*priv
;
1305 if (!scsi_is_host_device(dev
))
1308 shost
= dev_to_shost(dev
);
1309 if (!shost
->transportt
||
1310 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1313 priv
= to_iscsi_internal(shost
->transportt
);
1314 return &priv
->t
.host_attrs
.ac
== cont
;
1317 struct scsi_transport_template
*
1318 iscsi_register_transport(struct iscsi_transport
*tt
)
1320 struct iscsi_internal
*priv
;
1321 unsigned long flags
;
1326 priv
= iscsi_if_transport_lookup(tt
);
1330 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1333 INIT_LIST_HEAD(&priv
->list
);
1334 priv
->iscsi_transport
= tt
;
1335 priv
->t
.user_scan
= iscsi_user_scan
;
1337 priv
->cdev
.class = &iscsi_transport_class
;
1338 snprintf(priv
->cdev
.class_id
, BUS_ID_SIZE
, "%s", tt
->name
);
1339 err
= class_device_register(&priv
->cdev
);
1343 err
= sysfs_create_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1345 goto unregister_cdev
;
1347 /* host parameters */
1348 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1349 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1350 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1351 priv
->t
.host_size
= sizeof(struct iscsi_host
);
1352 priv
->host_attrs
[0] = NULL
;
1353 transport_container_register(&priv
->t
.host_attrs
);
1355 /* connection parameters */
1356 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1357 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1358 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1359 transport_container_register(&priv
->conn_cont
);
1361 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1362 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1363 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1364 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1365 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1366 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1367 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1368 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1369 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1370 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1371 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1373 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1374 priv
->conn_attrs
[count
] = NULL
;
1377 /* session parameters */
1378 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1379 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1380 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1381 transport_container_register(&priv
->session_cont
);
1383 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1384 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1385 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1386 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1387 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1388 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1389 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1390 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1391 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1392 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1393 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1395 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1396 priv
->session_attrs
[count
] = NULL
;
1398 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1399 list_add(&priv
->list
, &iscsi_transports
);
1400 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1402 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1406 class_device_unregister(&priv
->cdev
);
1411 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1413 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1415 struct iscsi_internal
*priv
;
1416 unsigned long flags
;
1420 mutex_lock(&rx_queue_mutex
);
1422 priv
= iscsi_if_transport_lookup(tt
);
1425 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1426 list_del(&priv
->list
);
1427 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1429 transport_container_unregister(&priv
->conn_cont
);
1430 transport_container_unregister(&priv
->session_cont
);
1431 transport_container_unregister(&priv
->t
.host_attrs
);
1433 sysfs_remove_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1434 class_device_unregister(&priv
->cdev
);
1435 mutex_unlock(&rx_queue_mutex
);
1439 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1442 iscsi_rcv_nl_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1444 struct netlink_notify
*n
= ptr
;
1446 if (event
== NETLINK_URELEASE
&&
1447 n
->protocol
== NETLINK_ISCSI
&& n
->pid
) {
1448 struct iscsi_cls_conn
*conn
;
1449 unsigned long flags
;
1451 mempool_zone_complete(z_reply
);
1452 spin_lock_irqsave(&connlock
, flags
);
1453 list_for_each_entry(conn
, &connlist
, conn_list
) {
1454 mempool_zone_complete(conn
->z_error
);
1455 mempool_zone_complete(conn
->z_pdu
);
1457 spin_unlock_irqrestore(&connlock
, flags
);
1463 static struct notifier_block iscsi_nl_notifier
= {
1464 .notifier_call
= iscsi_rcv_nl_event
,
1467 static __init
int iscsi_transport_init(void)
1471 err
= class_register(&iscsi_transport_class
);
1475 err
= transport_class_register(&iscsi_host_class
);
1477 goto unregister_transport_class
;
1479 err
= transport_class_register(&iscsi_connection_class
);
1481 goto unregister_host_class
;
1483 err
= transport_class_register(&iscsi_session_class
);
1485 goto unregister_conn_class
;
1487 err
= netlink_register_notifier(&iscsi_nl_notifier
);
1489 goto unregister_session_class
;
1491 nls
= netlink_kernel_create(NETLINK_ISCSI
, 1, iscsi_if_rx
,
1495 goto unregister_notifier
;
1498 z_reply
= mempool_zone_init(Z_MAX_REPLY
,
1499 NLMSG_SPACE(sizeof(struct iscsi_uevent
)), Z_HIWAT_REPLY
);
1503 sock_release(nls
->sk_socket
);
1504 unregister_notifier
:
1505 netlink_unregister_notifier(&iscsi_nl_notifier
);
1506 unregister_session_class
:
1507 transport_class_unregister(&iscsi_session_class
);
1508 unregister_conn_class
:
1509 transport_class_unregister(&iscsi_connection_class
);
1510 unregister_host_class
:
1511 transport_class_unregister(&iscsi_host_class
);
1512 unregister_transport_class
:
1513 class_unregister(&iscsi_transport_class
);
1517 static void __exit
iscsi_transport_exit(void)
1519 mempool_zone_destroy(z_reply
);
1520 sock_release(nls
->sk_socket
);
1521 netlink_unregister_notifier(&iscsi_nl_notifier
);
1522 transport_class_unregister(&iscsi_connection_class
);
1523 transport_class_unregister(&iscsi_session_class
);
1524 transport_class_unregister(&iscsi_host_class
);
1525 class_unregister(&iscsi_transport_class
);
1528 module_init(iscsi_transport_init
);
1529 module_exit(iscsi_transport_exit
);
1531 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1532 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1533 "Alex Aizman <itn780@yahoo.com>");
1534 MODULE_DESCRIPTION("iSCSI Transport Interface");
1535 MODULE_LICENSE("GPL");