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 iscsi_transport
*transport
= session
->transport
;
232 struct Scsi_Host
*shost
;
234 shost
= iscsi_session_to_shost(session
);
235 scsi_host_put(shost
);
236 kfree(session
->targetname
);
238 module_put(transport
->owner
);
241 static int iscsi_is_session_dev(const struct device
*dev
)
243 return dev
->release
== iscsi_session_release
;
246 static int iscsi_user_scan(struct Scsi_Host
*shost
, uint channel
,
249 struct iscsi_host
*ihost
= shost
->shost_data
;
250 struct iscsi_cls_session
*session
;
252 mutex_lock(&ihost
->mutex
);
253 list_for_each_entry(session
, &ihost
->sessions
, host_list
) {
254 if ((channel
== SCAN_WILD_CARD
||
255 channel
== session
->channel
) &&
256 (id
== SCAN_WILD_CARD
|| id
== session
->target_id
))
257 scsi_scan_target(&session
->dev
, session
->channel
,
258 session
->target_id
, lun
, 1);
260 mutex_unlock(&ihost
->mutex
);
265 static void session_recovery_timedout(void *data
)
267 struct iscsi_cls_session
*session
= data
;
269 dev_printk(KERN_INFO
, &session
->dev
, "iscsi: session recovery timed "
270 "out after %d secs\n", session
->recovery_tmo
);
272 if (session
->transport
->session_recovery_timedout
)
273 session
->transport
->session_recovery_timedout(session
);
275 scsi_target_unblock(&session
->dev
);
278 void iscsi_unblock_session(struct iscsi_cls_session
*session
)
280 if (!cancel_delayed_work(&session
->recovery_work
))
281 flush_scheduled_work();
282 scsi_target_unblock(&session
->dev
);
284 EXPORT_SYMBOL_GPL(iscsi_unblock_session
);
286 void iscsi_block_session(struct iscsi_cls_session
*session
)
288 scsi_target_block(&session
->dev
);
289 schedule_delayed_work(&session
->recovery_work
,
290 session
->recovery_tmo
* HZ
);
292 EXPORT_SYMBOL_GPL(iscsi_block_session
);
295 * iscsi_create_session - create iscsi class session
297 * @transport: iscsi transport
299 * This can be called from a LLD or iscsi_transport.
301 struct iscsi_cls_session
*
302 iscsi_create_session(struct Scsi_Host
*shost
,
303 struct iscsi_transport
*transport
, int channel
)
305 struct iscsi_host
*ihost
;
306 struct iscsi_cls_session
*session
;
309 if (!try_module_get(transport
->owner
))
312 session
= kzalloc(sizeof(*session
) + transport
->sessiondata_size
,
316 session
->transport
= transport
;
317 session
->recovery_tmo
= 120;
318 INIT_WORK(&session
->recovery_work
, session_recovery_timedout
, session
);
319 INIT_LIST_HEAD(&session
->host_list
);
320 INIT_LIST_HEAD(&session
->sess_list
);
322 if (transport
->sessiondata_size
)
323 session
->dd_data
= &session
[1];
325 /* this is released in the dev's release function */
326 scsi_host_get(shost
);
327 ihost
= shost
->shost_data
;
329 session
->sid
= iscsi_session_nr
++;
330 session
->channel
= channel
;
331 session
->target_id
= ihost
->next_target_id
++;
333 snprintf(session
->dev
.bus_id
, BUS_ID_SIZE
, "session%u",
335 session
->dev
.parent
= &shost
->shost_gendev
;
336 session
->dev
.release
= iscsi_session_release
;
337 err
= device_register(&session
->dev
);
339 dev_printk(KERN_ERR
, &session
->dev
, "iscsi: could not "
340 "register session's dev\n");
343 transport_register_device(&session
->dev
);
345 mutex_lock(&ihost
->mutex
);
346 list_add(&session
->host_list
, &ihost
->sessions
);
347 mutex_unlock(&ihost
->mutex
);
354 module_put(transport
->owner
);
358 EXPORT_SYMBOL_GPL(iscsi_create_session
);
361 * iscsi_destroy_session - destroy iscsi session
362 * @session: iscsi_session
364 * Can be called by a LLD or iscsi_transport. There must not be
365 * any running connections.
367 int iscsi_destroy_session(struct iscsi_cls_session
*session
)
369 struct Scsi_Host
*shost
= iscsi_session_to_shost(session
);
370 struct iscsi_host
*ihost
= shost
->shost_data
;
372 if (!cancel_delayed_work(&session
->recovery_work
))
373 flush_scheduled_work();
375 mutex_lock(&ihost
->mutex
);
376 list_del(&session
->host_list
);
377 mutex_unlock(&ihost
->mutex
);
379 transport_unregister_device(&session
->dev
);
380 device_unregister(&session
->dev
);
384 EXPORT_SYMBOL_GPL(iscsi_destroy_session
);
386 static void iscsi_conn_release(struct device
*dev
)
388 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
389 struct device
*parent
= conn
->dev
.parent
;
391 kfree(conn
->persistent_address
);
396 static int iscsi_is_conn_dev(const struct device
*dev
)
398 return dev
->release
== iscsi_conn_release
;
402 * iscsi_create_conn - create iscsi class connection
403 * @session: iscsi cls session
404 * @cid: connection id
406 * This can be called from a LLD or iscsi_transport. The connection
407 * is child of the session so cid must be unique for all connections
410 * Since we do not support MCS, cid will normally be zero. In some cases
411 * for software iscsi we could be trying to preallocate a connection struct
412 * in which case there could be two connection structs and cid would be
415 struct iscsi_cls_conn
*
416 iscsi_create_conn(struct iscsi_cls_session
*session
, uint32_t cid
)
418 struct iscsi_transport
*transport
= session
->transport
;
419 struct iscsi_cls_conn
*conn
;
422 conn
= kzalloc(sizeof(*conn
) + transport
->conndata_size
, GFP_KERNEL
);
426 if (transport
->conndata_size
)
427 conn
->dd_data
= &conn
[1];
429 INIT_LIST_HEAD(&conn
->conn_list
);
430 conn
->transport
= transport
;
433 /* this is released in the dev's release function */
434 if (!get_device(&session
->dev
))
437 snprintf(conn
->dev
.bus_id
, BUS_ID_SIZE
, "connection%d:%u",
439 conn
->dev
.parent
= &session
->dev
;
440 conn
->dev
.release
= iscsi_conn_release
;
441 err
= device_register(&conn
->dev
);
443 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: could not register "
444 "connection's dev\n");
445 goto release_parent_ref
;
447 transport_register_device(&conn
->dev
);
451 put_device(&session
->dev
);
457 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
460 * iscsi_destroy_conn - destroy iscsi class connection
461 * @session: iscsi cls session
463 * This can be called from a LLD or iscsi_transport.
465 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
467 transport_unregister_device(&conn
->dev
);
468 device_unregister(&conn
->dev
);
472 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
475 * iscsi interface functions
477 static struct iscsi_internal
*
478 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
480 struct iscsi_internal
*priv
;
483 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
484 list_for_each_entry(priv
, &iscsi_transports
, list
) {
485 if (tt
== priv
->iscsi_transport
) {
486 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
490 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
494 static inline struct list_head
*skb_to_lh(struct sk_buff
*skb
)
496 return (struct list_head
*)&skb
->cb
;
500 mempool_zone_alloc_skb(gfp_t gfp_mask
, void *pool_data
)
502 struct mempool_zone
*zone
= pool_data
;
504 return alloc_skb(zone
->size
, gfp_mask
);
508 mempool_zone_free_skb(void *element
, void *pool_data
)
514 mempool_zone_complete(struct mempool_zone
*zone
)
517 struct list_head
*lh
, *n
;
519 spin_lock_irqsave(&zone
->freelock
, flags
);
520 list_for_each_safe(lh
, n
, &zone
->freequeue
) {
521 struct sk_buff
*skb
= (struct sk_buff
*)((char *)lh
-
522 offsetof(struct sk_buff
, cb
));
523 if (!skb_shared(skb
)) {
524 list_del(skb_to_lh(skb
));
525 mempool_free(skb
, zone
->pool
);
526 atomic_dec(&zone
->allocated
);
529 spin_unlock_irqrestore(&zone
->freelock
, flags
);
532 static struct mempool_zone
*
533 mempool_zone_init(unsigned max
, unsigned size
, unsigned hiwat
)
535 struct mempool_zone
*zp
;
537 zp
= kzalloc(sizeof(*zp
), GFP_KERNEL
);
543 INIT_LIST_HEAD(&zp
->freequeue
);
544 spin_lock_init(&zp
->freelock
);
545 atomic_set(&zp
->allocated
, 0);
547 zp
->pool
= mempool_create(max
, mempool_zone_alloc_skb
,
548 mempool_zone_free_skb
, zp
);
557 static void mempool_zone_destroy(struct mempool_zone
*zp
)
559 mempool_destroy(zp
->pool
);
563 static struct sk_buff
*
564 mempool_zone_get_skb(struct mempool_zone
*zone
)
568 skb
= mempool_alloc(zone
->pool
, GFP_ATOMIC
);
570 atomic_inc(&zone
->allocated
);
575 iscsi_unicast_skb(struct mempool_zone
*zone
, struct sk_buff
*skb
, int pid
)
581 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
583 mempool_free(skb
, zone
->pool
);
584 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
588 spin_lock_irqsave(&zone
->freelock
, flags
);
589 INIT_LIST_HEAD(skb_to_lh(skb
));
590 list_add(skb_to_lh(skb
), &zone
->freequeue
);
591 spin_unlock_irqrestore(&zone
->freelock
, flags
);
596 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
597 char *data
, uint32_t data_size
)
599 struct nlmsghdr
*nlh
;
601 struct iscsi_uevent
*ev
;
603 struct iscsi_internal
*priv
;
604 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
607 priv
= iscsi_if_transport_lookup(conn
->transport
);
611 mempool_zone_complete(conn
->z_pdu
);
613 skb
= mempool_zone_get_skb(conn
->z_pdu
);
615 iscsi_conn_error(conn
, ISCSI_ERR_CONN_FAILED
);
616 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not deliver "
617 "control PDU: OOM\n");
621 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
622 ev
= NLMSG_DATA(nlh
);
623 memset(ev
, 0, sizeof(*ev
));
624 ev
->transport_handle
= iscsi_handle(conn
->transport
);
625 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
626 if (atomic_read(&conn
->z_pdu
->allocated
) >= conn
->z_pdu
->hiwat
)
627 ev
->iferror
= -ENOMEM
;
628 ev
->r
.recv_req
.cid
= conn
->cid
;
629 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
630 pdu
= (char*)ev
+ sizeof(*ev
);
631 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
632 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
634 return iscsi_unicast_skb(conn
->z_pdu
, skb
, priv
->daemon_pid
);
636 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
638 void iscsi_conn_error(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
640 struct nlmsghdr
*nlh
;
642 struct iscsi_uevent
*ev
;
643 struct iscsi_internal
*priv
;
644 int len
= NLMSG_SPACE(sizeof(*ev
));
646 priv
= iscsi_if_transport_lookup(conn
->transport
);
650 mempool_zone_complete(conn
->z_error
);
652 skb
= mempool_zone_get_skb(conn
->z_error
);
654 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: gracefully ignored "
655 "conn error (%d)\n", error
);
659 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
660 ev
= NLMSG_DATA(nlh
);
661 ev
->transport_handle
= iscsi_handle(conn
->transport
);
662 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
663 if (atomic_read(&conn
->z_error
->allocated
) >= conn
->z_error
->hiwat
)
664 ev
->iferror
= -ENOMEM
;
665 ev
->r
.connerror
.error
= error
;
666 ev
->r
.connerror
.cid
= conn
->cid
;
667 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
669 iscsi_unicast_skb(conn
->z_error
, skb
, priv
->daemon_pid
);
671 dev_printk(KERN_INFO
, &conn
->dev
, "iscsi: detected conn error (%d)\n",
674 EXPORT_SYMBOL_GPL(iscsi_conn_error
);
677 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
678 void *payload
, int size
)
681 struct nlmsghdr
*nlh
;
682 int len
= NLMSG_SPACE(size
);
683 int flags
= multi
? NLM_F_MULTI
: 0;
684 int t
= done
? NLMSG_DONE
: type
;
686 mempool_zone_complete(z_reply
);
688 skb
= mempool_zone_get_skb(z_reply
);
691 * user is supposed to react on iferror == -ENOMEM;
696 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
697 nlh
->nlmsg_flags
= flags
;
698 memcpy(NLMSG_DATA(nlh
), payload
, size
);
699 return iscsi_unicast_skb(z_reply
, skb
, pid
);
703 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
705 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
706 struct iscsi_stats
*stats
;
707 struct sk_buff
*skbstat
;
708 struct iscsi_cls_conn
*conn
;
709 struct nlmsghdr
*nlhstat
;
710 struct iscsi_uevent
*evstat
;
711 struct iscsi_internal
*priv
;
712 int len
= NLMSG_SPACE(sizeof(*ev
) +
713 sizeof(struct iscsi_stats
) +
714 sizeof(struct iscsi_stats_custom
) *
715 ISCSI_STATS_CUSTOM_MAX
);
718 priv
= iscsi_if_transport_lookup(transport
);
722 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
729 mempool_zone_complete(conn
->z_pdu
);
731 skbstat
= mempool_zone_get_skb(conn
->z_pdu
);
733 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not "
734 "deliver stats: OOM\n");
738 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
739 (len
- sizeof(*nlhstat
)), 0);
740 evstat
= NLMSG_DATA(nlhstat
);
741 memset(evstat
, 0, sizeof(*evstat
));
742 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
743 evstat
->type
= nlh
->nlmsg_type
;
744 if (atomic_read(&conn
->z_pdu
->allocated
) >= conn
->z_pdu
->hiwat
)
745 evstat
->iferror
= -ENOMEM
;
746 evstat
->u
.get_stats
.cid
=
748 evstat
->u
.get_stats
.sid
=
750 stats
= (struct iscsi_stats
*)
751 ((char*)evstat
+ sizeof(*evstat
));
752 memset(stats
, 0, sizeof(*stats
));
754 transport
->get_stats(conn
, stats
);
755 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
756 sizeof(struct iscsi_stats
) +
757 sizeof(struct iscsi_stats_custom
) *
758 stats
->custom_length
);
759 actual_size
-= sizeof(*nlhstat
);
760 actual_size
= NLMSG_LENGTH(actual_size
);
761 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
762 nlhstat
->nlmsg_len
= actual_size
;
764 err
= iscsi_unicast_skb(conn
->z_pdu
, skbstat
, priv
->daemon_pid
);
765 } while (err
< 0 && err
!= -ECONNREFUSED
);
771 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_uevent
*ev
)
773 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
774 struct iscsi_cls_session
*session
;
778 session
= transport
->create_session(transport
, &priv
->t
,
779 ev
->u
.c_session
.initial_cmdsn
,
784 spin_lock_irqsave(&sesslock
, flags
);
785 list_add(&session
->sess_list
, &sesslist
);
786 spin_unlock_irqrestore(&sesslock
, flags
);
788 ev
->r
.c_session_ret
.host_no
= hostno
;
789 ev
->r
.c_session_ret
.sid
= session
->sid
;
794 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
796 struct iscsi_cls_conn
*conn
;
797 struct iscsi_cls_session
*session
;
800 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
802 printk(KERN_ERR
"iscsi: invalid session %d\n",
807 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
809 printk(KERN_ERR
"iscsi: couldn't create a new "
810 "connection for session %d\n",
815 conn
->z_pdu
= mempool_zone_init(Z_MAX_PDU
,
816 NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
817 sizeof(struct iscsi_hdr
) +
818 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
),
821 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not allocate "
822 "pdu zone for new conn\n");
826 conn
->z_error
= mempool_zone_init(Z_MAX_ERROR
,
827 NLMSG_SPACE(sizeof(struct iscsi_uevent
)),
829 if (!conn
->z_error
) {
830 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not allocate "
831 "error zone for new conn\n");
835 ev
->r
.c_conn_ret
.sid
= session
->sid
;
836 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
838 spin_lock_irqsave(&connlock
, flags
);
839 list_add(&conn
->conn_list
, &connlist
);
841 spin_unlock_irqrestore(&connlock
, flags
);
846 mempool_zone_destroy(conn
->z_pdu
);
848 if (transport
->destroy_conn
)
849 transport
->destroy_conn(conn
->dd_data
);
854 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
857 struct iscsi_cls_conn
*conn
;
858 struct mempool_zone
*z_error
, *z_pdu
;
860 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
863 spin_lock_irqsave(&connlock
, flags
);
865 list_del(&conn
->conn_list
);
866 spin_unlock_irqrestore(&connlock
, flags
);
869 z_error
= conn
->z_error
;
871 if (transport
->destroy_conn
)
872 transport
->destroy_conn(conn
);
874 mempool_zone_destroy(z_pdu
);
875 mempool_zone_destroy(z_error
);
881 iscsi_copy_param(struct iscsi_uevent
*ev
, uint32_t *value
, char *data
)
883 if (ev
->u
.set_param
.len
!= sizeof(uint32_t))
885 memcpy(value
, data
, min_t(uint32_t, sizeof(uint32_t),
886 ev
->u
.set_param
.len
));
890 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
892 char *data
= (char*)ev
+ sizeof(*ev
);
893 struct iscsi_cls_conn
*conn
;
894 struct iscsi_cls_session
*session
;
898 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
899 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
900 if (!conn
|| !session
)
903 switch (ev
->u
.set_param
.param
) {
904 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
905 iscsi_copy_param(ev
, &value
, data
);
907 session
->recovery_tmo
= value
;
909 case ISCSI_PARAM_TARGET_NAME
:
910 /* this should not change between logins */
911 if (session
->targetname
)
914 session
->targetname
= kstrdup(data
, GFP_KERNEL
);
915 if (!session
->targetname
)
918 case ISCSI_PARAM_TPGT
:
919 iscsi_copy_param(ev
, &value
, data
);
920 session
->tpgt
= value
;
922 case ISCSI_PARAM_PERSISTENT_PORT
:
923 iscsi_copy_param(ev
, &value
, data
);
924 conn
->persistent_port
= value
;
926 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
928 * this is the address returned in discovery so it should
929 * not change between logins.
931 if (conn
->persistent_address
)
934 conn
->persistent_address
= kstrdup(data
, GFP_KERNEL
);
935 if (!conn
->persistent_address
)
939 iscsi_copy_param(ev
, &value
, data
);
940 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
, value
);
947 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
948 struct iscsi_uevent
*ev
, int msg_type
)
950 struct sockaddr
*dst_addr
;
954 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
955 if (!transport
->ep_connect
)
958 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
959 rc
= transport
->ep_connect(dst_addr
,
960 ev
->u
.ep_connect
.non_blocking
,
961 &ev
->r
.ep_connect_ret
.handle
);
963 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
964 if (!transport
->ep_poll
)
967 ev
->r
.retcode
= transport
->ep_poll(ev
->u
.ep_poll
.ep_handle
,
968 ev
->u
.ep_poll
.timeout_ms
);
970 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
971 if (!transport
->ep_disconnect
)
974 transport
->ep_disconnect(ev
->u
.ep_disconnect
.ep_handle
);
981 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
982 struct iscsi_uevent
*ev
)
984 struct sockaddr
*dst_addr
;
986 if (!transport
->tgt_dscvr
)
989 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
990 return transport
->tgt_dscvr(ev
->u
.tgt_dscvr
.type
,
991 ev
->u
.tgt_dscvr
.host_no
,
992 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
996 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
999 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1000 struct iscsi_transport
*transport
= NULL
;
1001 struct iscsi_internal
*priv
;
1002 struct iscsi_cls_session
*session
;
1003 struct iscsi_cls_conn
*conn
;
1004 unsigned long flags
;
1006 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
1009 transport
= priv
->iscsi_transport
;
1011 if (!try_module_get(transport
->owner
))
1014 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1016 switch (nlh
->nlmsg_type
) {
1017 case ISCSI_UEVENT_CREATE_SESSION
:
1018 err
= iscsi_if_create_session(priv
, ev
);
1020 case ISCSI_UEVENT_DESTROY_SESSION
:
1021 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1023 spin_lock_irqsave(&sesslock
, flags
);
1024 list_del(&session
->sess_list
);
1025 spin_unlock_irqrestore(&sesslock
, flags
);
1027 transport
->destroy_session(session
);
1031 case ISCSI_UEVENT_CREATE_CONN
:
1032 err
= iscsi_if_create_conn(transport
, ev
);
1034 case ISCSI_UEVENT_DESTROY_CONN
:
1035 err
= iscsi_if_destroy_conn(transport
, ev
);
1037 case ISCSI_UEVENT_BIND_CONN
:
1038 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1039 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1041 if (session
&& conn
)
1042 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1043 ev
->u
.b_conn
.transport_eph
,
1044 ev
->u
.b_conn
.is_leading
);
1048 case ISCSI_UEVENT_SET_PARAM
:
1049 err
= iscsi_set_param(transport
, ev
);
1051 case ISCSI_UEVENT_START_CONN
:
1052 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1054 ev
->r
.retcode
= transport
->start_conn(conn
);
1058 case ISCSI_UEVENT_STOP_CONN
:
1059 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1061 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1065 case ISCSI_UEVENT_SEND_PDU
:
1066 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1068 ev
->r
.retcode
= transport
->send_pdu(conn
,
1069 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1070 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1071 ev
->u
.send_pdu
.data_size
);
1075 case ISCSI_UEVENT_GET_STATS
:
1076 err
= iscsi_if_get_stats(transport
, nlh
);
1078 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1079 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1080 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1081 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1083 case ISCSI_UEVENT_TGT_DSCVR
:
1084 err
= iscsi_tgt_dscvr(transport
, ev
);
1091 module_put(transport
->owner
);
1096 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
1097 * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or
1098 * invalid creds are discarded silently.
1101 iscsi_if_rx(struct sock
*sk
, int len
)
1103 struct sk_buff
*skb
;
1105 mutex_lock(&rx_queue_mutex
);
1106 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
1107 if (NETLINK_CREDS(skb
)->uid
) {
1108 skb_pull(skb
, skb
->len
);
1112 while (skb
->len
>= NLMSG_SPACE(0)) {
1115 struct nlmsghdr
*nlh
;
1116 struct iscsi_uevent
*ev
;
1118 nlh
= (struct nlmsghdr
*)skb
->data
;
1119 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1120 skb
->len
< nlh
->nlmsg_len
) {
1124 ev
= NLMSG_DATA(nlh
);
1125 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1126 if (rlen
> skb
->len
)
1129 err
= iscsi_if_recv_msg(skb
, nlh
);
1131 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1136 * special case for GET_STATS:
1137 * on success - sending reply and stats from
1138 * inside of if_recv_msg(),
1139 * on error - fall through.
1141 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1143 err
= iscsi_if_send_reply(
1144 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1145 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1146 if (atomic_read(&z_reply
->allocated
) >=
1148 ev
->iferror
= -ENOMEM
;
1149 } while (err
< 0 && err
!= -ECONNREFUSED
);
1150 skb_pull(skb
, rlen
);
1155 mutex_unlock(&rx_queue_mutex
);
1158 #define iscsi_cdev_to_conn(_cdev) \
1159 iscsi_dev_to_conn(_cdev->dev)
1161 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1162 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1163 __ATTR(_name,_mode,_show,_store)
1166 * iSCSI connection attrs
1168 #define iscsi_conn_int_attr_show(param, format) \
1170 show_conn_int_param_##param(struct class_device *cdev, char *buf) \
1172 uint32_t value = 0; \
1173 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1174 struct iscsi_transport *t = conn->transport; \
1176 t->get_conn_param(conn, param, &value); \
1177 return snprintf(buf, 20, format"\n", value); \
1180 #define iscsi_conn_int_attr(field, param, format) \
1181 iscsi_conn_int_attr_show(param, format) \
1182 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_int_param_##param, \
1185 iscsi_conn_int_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
, "%u");
1186 iscsi_conn_int_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
, "%u");
1187 iscsi_conn_int_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
, "%d");
1188 iscsi_conn_int_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
, "%d");
1189 iscsi_conn_int_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
, "%d");
1190 iscsi_conn_int_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
, "%d");
1191 iscsi_conn_int_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
, "%d");
1192 iscsi_conn_int_attr(port
, ISCSI_PARAM_CONN_PORT
, "%d");
1193 iscsi_conn_int_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
, "%u");
1195 #define iscsi_conn_str_attr_show(param) \
1197 show_conn_str_param_##param(struct class_device *cdev, char *buf) \
1199 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1200 struct iscsi_transport *t = conn->transport; \
1201 return t->get_conn_str_param(conn, param, buf); \
1204 #define iscsi_conn_str_attr(field, param) \
1205 iscsi_conn_str_attr_show(param) \
1206 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_str_param_##param, \
1209 iscsi_conn_str_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1210 iscsi_conn_str_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1212 #define iscsi_cdev_to_session(_cdev) \
1213 iscsi_dev_to_session(_cdev->dev)
1216 * iSCSI session attrs
1218 #define iscsi_session_int_attr_show(param, format) \
1220 show_session_int_param_##param(struct class_device *cdev, char *buf) \
1222 uint32_t value = 0; \
1223 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1224 struct iscsi_transport *t = session->transport; \
1226 t->get_session_param(session, param, &value); \
1227 return snprintf(buf, 20, format"\n", value); \
1230 #define iscsi_session_int_attr(field, param, format) \
1231 iscsi_session_int_attr_show(param, format) \
1232 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_int_param_##param, \
1235 iscsi_session_int_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
, "%d");
1236 iscsi_session_int_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
, "%hu");
1237 iscsi_session_int_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
, "%d");
1238 iscsi_session_int_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
, "%u");
1239 iscsi_session_int_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
, "%u");
1240 iscsi_session_int_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
, "%d");
1241 iscsi_session_int_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
, "%d");
1242 iscsi_session_int_attr(erl
, ISCSI_PARAM_ERL
, "%d");
1243 iscsi_session_int_attr(tpgt
, ISCSI_PARAM_TPGT
, "%d");
1245 #define iscsi_session_str_attr_show(param) \
1247 show_session_str_param_##param(struct class_device *cdev, char *buf) \
1249 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1250 struct iscsi_transport *t = session->transport; \
1251 return t->get_session_str_param(session, param, buf); \
1254 #define iscsi_session_str_attr(field, param) \
1255 iscsi_session_str_attr_show(param) \
1256 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_str_param_##param, \
1259 iscsi_session_str_attr(targetname
, ISCSI_PARAM_TARGET_NAME
);
1262 * Private session and conn attrs. userspace uses several iscsi values
1263 * to identify each session between reboots. Some of these values may not
1264 * be present in the iscsi_transport/LLD driver becuase userspace handles
1265 * login (and failback for login redirect) so for these type of drivers
1266 * the class manages the attrs and values for the iscsi_transport/LLD
1268 #define iscsi_priv_session_attr_show(field, format) \
1270 show_priv_session_##field(struct class_device *cdev, char *buf) \
1272 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1273 return sprintf(buf, format"\n", session->field); \
1276 #define iscsi_priv_session_attr(field, format) \
1277 iscsi_priv_session_attr_show(field, format) \
1278 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1280 iscsi_priv_session_attr(targetname
, "%s");
1281 iscsi_priv_session_attr(tpgt
, "%d");
1282 iscsi_priv_session_attr(recovery_tmo
, "%d");
1284 #define iscsi_priv_conn_attr_show(field, format) \
1286 show_priv_conn_##field(struct class_device *cdev, char *buf) \
1288 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1289 return sprintf(buf, format"\n", conn->field); \
1292 #define iscsi_priv_conn_attr(field, format) \
1293 iscsi_priv_conn_attr_show(field, format) \
1294 static ISCSI_CLASS_ATTR(priv_conn, field, S_IRUGO, show_priv_conn_##field, \
1296 iscsi_priv_conn_attr(persistent_address
, "%s");
1297 iscsi_priv_conn_attr(persistent_port
, "%d");
1299 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1301 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1305 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1307 if (tt->param_mask & param_flag) { \
1308 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1313 #define SETUP_PRIV_CONN_RD_ATTR(field) \
1315 priv->conn_attrs[count] = &class_device_attr_priv_conn_##field; \
1319 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1321 if (tt->param_mask & param_flag) { \
1322 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1327 static int iscsi_session_match(struct attribute_container
*cont
,
1330 struct iscsi_cls_session
*session
;
1331 struct Scsi_Host
*shost
;
1332 struct iscsi_internal
*priv
;
1334 if (!iscsi_is_session_dev(dev
))
1337 session
= iscsi_dev_to_session(dev
);
1338 shost
= iscsi_session_to_shost(session
);
1339 if (!shost
->transportt
)
1342 priv
= to_iscsi_internal(shost
->transportt
);
1343 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1346 return &priv
->session_cont
.ac
== cont
;
1349 static int iscsi_conn_match(struct attribute_container
*cont
,
1352 struct iscsi_cls_session
*session
;
1353 struct iscsi_cls_conn
*conn
;
1354 struct Scsi_Host
*shost
;
1355 struct iscsi_internal
*priv
;
1357 if (!iscsi_is_conn_dev(dev
))
1360 conn
= iscsi_dev_to_conn(dev
);
1361 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1362 shost
= iscsi_session_to_shost(session
);
1364 if (!shost
->transportt
)
1367 priv
= to_iscsi_internal(shost
->transportt
);
1368 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1371 return &priv
->conn_cont
.ac
== cont
;
1374 static int iscsi_host_match(struct attribute_container
*cont
,
1377 struct Scsi_Host
*shost
;
1378 struct iscsi_internal
*priv
;
1380 if (!scsi_is_host_device(dev
))
1383 shost
= dev_to_shost(dev
);
1384 if (!shost
->transportt
||
1385 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1388 priv
= to_iscsi_internal(shost
->transportt
);
1389 return &priv
->t
.host_attrs
.ac
== cont
;
1392 struct scsi_transport_template
*
1393 iscsi_register_transport(struct iscsi_transport
*tt
)
1395 struct iscsi_internal
*priv
;
1396 unsigned long flags
;
1401 priv
= iscsi_if_transport_lookup(tt
);
1405 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1408 INIT_LIST_HEAD(&priv
->list
);
1409 priv
->iscsi_transport
= tt
;
1410 priv
->t
.user_scan
= iscsi_user_scan
;
1412 priv
->cdev
.class = &iscsi_transport_class
;
1413 snprintf(priv
->cdev
.class_id
, BUS_ID_SIZE
, "%s", tt
->name
);
1414 err
= class_device_register(&priv
->cdev
);
1418 err
= sysfs_create_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1420 goto unregister_cdev
;
1422 /* host parameters */
1423 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1424 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1425 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1426 priv
->t
.host_size
= sizeof(struct iscsi_host
);
1427 priv
->host_attrs
[0] = NULL
;
1428 transport_container_register(&priv
->t
.host_attrs
);
1430 /* connection parameters */
1431 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1432 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1433 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1434 transport_container_register(&priv
->conn_cont
);
1436 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1437 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1438 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1439 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1440 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1441 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1442 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1443 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1444 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1446 if (tt
->param_mask
& ISCSI_PERSISTENT_ADDRESS
)
1447 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1449 SETUP_PRIV_CONN_RD_ATTR(persistent_address
);
1451 if (tt
->param_mask
& ISCSI_PERSISTENT_PORT
)
1452 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1454 SETUP_PRIV_CONN_RD_ATTR(persistent_port
);
1456 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1457 priv
->conn_attrs
[count
] = NULL
;
1460 /* session parameters */
1461 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1462 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1463 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1464 transport_container_register(&priv
->session_cont
);
1466 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1467 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1468 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1469 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1470 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1471 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1472 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1473 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1474 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1476 if (tt
->param_mask
& ISCSI_TARGET_NAME
)
1477 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1479 SETUP_PRIV_SESSION_RD_ATTR(targetname
);
1481 if (tt
->param_mask
& ISCSI_TPGT
)
1482 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1484 SETUP_PRIV_SESSION_RD_ATTR(tpgt
);
1486 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1487 priv
->session_attrs
[count
] = NULL
;
1489 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1490 list_add(&priv
->list
, &iscsi_transports
);
1491 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1493 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1497 class_device_unregister(&priv
->cdev
);
1502 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1504 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1506 struct iscsi_internal
*priv
;
1507 unsigned long flags
;
1511 mutex_lock(&rx_queue_mutex
);
1513 priv
= iscsi_if_transport_lookup(tt
);
1516 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1517 list_del(&priv
->list
);
1518 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1520 transport_container_unregister(&priv
->conn_cont
);
1521 transport_container_unregister(&priv
->session_cont
);
1522 transport_container_unregister(&priv
->t
.host_attrs
);
1524 sysfs_remove_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1525 class_device_unregister(&priv
->cdev
);
1526 mutex_unlock(&rx_queue_mutex
);
1530 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1533 iscsi_rcv_nl_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1535 struct netlink_notify
*n
= ptr
;
1537 if (event
== NETLINK_URELEASE
&&
1538 n
->protocol
== NETLINK_ISCSI
&& n
->pid
) {
1539 struct iscsi_cls_conn
*conn
;
1540 unsigned long flags
;
1542 mempool_zone_complete(z_reply
);
1543 spin_lock_irqsave(&connlock
, flags
);
1544 list_for_each_entry(conn
, &connlist
, conn_list
) {
1545 mempool_zone_complete(conn
->z_error
);
1546 mempool_zone_complete(conn
->z_pdu
);
1548 spin_unlock_irqrestore(&connlock
, flags
);
1554 static struct notifier_block iscsi_nl_notifier
= {
1555 .notifier_call
= iscsi_rcv_nl_event
,
1558 static __init
int iscsi_transport_init(void)
1562 err
= class_register(&iscsi_transport_class
);
1566 err
= transport_class_register(&iscsi_host_class
);
1568 goto unregister_transport_class
;
1570 err
= transport_class_register(&iscsi_connection_class
);
1572 goto unregister_host_class
;
1574 err
= transport_class_register(&iscsi_session_class
);
1576 goto unregister_conn_class
;
1578 err
= netlink_register_notifier(&iscsi_nl_notifier
);
1580 goto unregister_session_class
;
1582 nls
= netlink_kernel_create(NETLINK_ISCSI
, 1, iscsi_if_rx
,
1586 goto unregister_notifier
;
1589 z_reply
= mempool_zone_init(Z_MAX_REPLY
,
1590 NLMSG_SPACE(sizeof(struct iscsi_uevent
)), Z_HIWAT_REPLY
);
1594 sock_release(nls
->sk_socket
);
1595 unregister_notifier
:
1596 netlink_unregister_notifier(&iscsi_nl_notifier
);
1597 unregister_session_class
:
1598 transport_class_unregister(&iscsi_session_class
);
1599 unregister_conn_class
:
1600 transport_class_unregister(&iscsi_connection_class
);
1601 unregister_host_class
:
1602 transport_class_unregister(&iscsi_host_class
);
1603 unregister_transport_class
:
1604 class_unregister(&iscsi_transport_class
);
1608 static void __exit
iscsi_transport_exit(void)
1610 mempool_zone_destroy(z_reply
);
1611 sock_release(nls
->sk_socket
);
1612 netlink_unregister_notifier(&iscsi_nl_notifier
);
1613 transport_class_unregister(&iscsi_connection_class
);
1614 transport_class_unregister(&iscsi_session_class
);
1615 transport_class_unregister(&iscsi_host_class
);
1616 class_unregister(&iscsi_transport_class
);
1619 module_init(iscsi_transport_init
);
1620 module_exit(iscsi_transport_exit
);
1622 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1623 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1624 "Alex Aizman <itn780@yahoo.com>");
1625 MODULE_DESCRIPTION("iSCSI Transport Interface");
1626 MODULE_LICENSE("GPL");