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 mempool_zone_destroy(struct mempool_zone
*zp
)
418 mempool_destroy(zp
->pool
);
423 mempool_zone_alloc_skb(gfp_t gfp_mask
, void *pool_data
)
425 struct mempool_zone
*zone
= pool_data
;
427 return alloc_skb(zone
->size
, gfp_mask
);
431 mempool_zone_free_skb(void *element
, void *pool_data
)
436 static struct mempool_zone
*
437 mempool_zone_init(unsigned max
, unsigned size
, unsigned hiwat
)
439 struct mempool_zone
*zp
;
441 zp
= kzalloc(sizeof(*zp
), GFP_KERNEL
);
447 INIT_LIST_HEAD(&zp
->freequeue
);
448 spin_lock_init(&zp
->freelock
);
449 atomic_set(&zp
->allocated
, 0);
451 zp
->pool
= mempool_create(max
, mempool_zone_alloc_skb
,
452 mempool_zone_free_skb
, zp
);
461 static void iscsi_conn_release(struct device
*dev
)
463 struct iscsi_cls_conn
*conn
= iscsi_dev_to_conn(dev
);
464 struct device
*parent
= conn
->dev
.parent
;
466 mempool_zone_destroy(conn
->z_pdu
);
467 mempool_zone_destroy(conn
->z_error
);
473 static int iscsi_is_conn_dev(const struct device
*dev
)
475 return dev
->release
== iscsi_conn_release
;
478 static int iscsi_create_event_pools(struct iscsi_cls_conn
*conn
)
480 conn
->z_pdu
= mempool_zone_init(Z_MAX_PDU
,
481 NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
482 sizeof(struct iscsi_hdr
) +
483 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
),
486 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not allocate "
487 "pdu zone for new conn\n");
491 conn
->z_error
= mempool_zone_init(Z_MAX_ERROR
,
492 NLMSG_SPACE(sizeof(struct iscsi_uevent
)),
494 if (!conn
->z_error
) {
495 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not allocate "
496 "error zone for new conn\n");
497 mempool_zone_destroy(conn
->z_pdu
);
504 * iscsi_create_conn - create iscsi class connection
505 * @session: iscsi cls session
506 * @cid: connection id
508 * This can be called from a LLD or iscsi_transport. The connection
509 * is child of the session so cid must be unique for all connections
512 * Since we do not support MCS, cid will normally be zero. In some cases
513 * for software iscsi we could be trying to preallocate a connection struct
514 * in which case there could be two connection structs and cid would be
517 struct iscsi_cls_conn
*
518 iscsi_create_conn(struct iscsi_cls_session
*session
, uint32_t cid
)
520 struct iscsi_transport
*transport
= session
->transport
;
521 struct iscsi_cls_conn
*conn
;
524 conn
= kzalloc(sizeof(*conn
) + transport
->conndata_size
, GFP_KERNEL
);
528 if (transport
->conndata_size
)
529 conn
->dd_data
= &conn
[1];
531 INIT_LIST_HEAD(&conn
->conn_list
);
532 conn
->transport
= transport
;
535 if (iscsi_create_event_pools(conn
))
538 /* this is released in the dev's release function */
539 if (!get_device(&session
->dev
))
540 goto free_conn_pools
;
542 snprintf(conn
->dev
.bus_id
, BUS_ID_SIZE
, "connection%d:%u",
544 conn
->dev
.parent
= &session
->dev
;
545 conn
->dev
.release
= iscsi_conn_release
;
546 err
= device_register(&conn
->dev
);
548 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: could not register "
549 "connection's dev\n");
550 goto release_parent_ref
;
552 transport_register_device(&conn
->dev
);
556 put_device(&session
->dev
);
564 EXPORT_SYMBOL_GPL(iscsi_create_conn
);
567 * iscsi_destroy_conn - destroy iscsi class connection
568 * @session: iscsi cls session
570 * This can be called from a LLD or iscsi_transport.
572 int iscsi_destroy_conn(struct iscsi_cls_conn
*conn
)
574 transport_unregister_device(&conn
->dev
);
575 device_unregister(&conn
->dev
);
579 EXPORT_SYMBOL_GPL(iscsi_destroy_conn
);
582 * iscsi interface functions
584 static struct iscsi_internal
*
585 iscsi_if_transport_lookup(struct iscsi_transport
*tt
)
587 struct iscsi_internal
*priv
;
590 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
591 list_for_each_entry(priv
, &iscsi_transports
, list
) {
592 if (tt
== priv
->iscsi_transport
) {
593 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
597 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
601 static inline struct list_head
*skb_to_lh(struct sk_buff
*skb
)
603 return (struct list_head
*)&skb
->cb
;
607 mempool_zone_complete(struct mempool_zone
*zone
)
610 struct list_head
*lh
, *n
;
612 spin_lock_irqsave(&zone
->freelock
, flags
);
613 list_for_each_safe(lh
, n
, &zone
->freequeue
) {
614 struct sk_buff
*skb
= (struct sk_buff
*)((char *)lh
-
615 offsetof(struct sk_buff
, cb
));
616 if (!skb_shared(skb
)) {
617 list_del(skb_to_lh(skb
));
618 mempool_free(skb
, zone
->pool
);
619 atomic_dec(&zone
->allocated
);
622 spin_unlock_irqrestore(&zone
->freelock
, flags
);
625 static struct sk_buff
*
626 mempool_zone_get_skb(struct mempool_zone
*zone
)
630 skb
= mempool_alloc(zone
->pool
, GFP_ATOMIC
);
632 atomic_inc(&zone
->allocated
);
637 iscsi_broadcast_skb(struct mempool_zone
*zone
, struct sk_buff
*skb
)
643 rc
= netlink_broadcast(nls
, skb
, 0, 1, GFP_KERNEL
);
645 mempool_free(skb
, zone
->pool
);
646 printk(KERN_ERR
"iscsi: can not broadcast skb (%d)\n", rc
);
650 spin_lock_irqsave(&zone
->freelock
, flags
);
651 INIT_LIST_HEAD(skb_to_lh(skb
));
652 list_add(skb_to_lh(skb
), &zone
->freequeue
);
653 spin_unlock_irqrestore(&zone
->freelock
, flags
);
658 iscsi_unicast_skb(struct mempool_zone
*zone
, struct sk_buff
*skb
, int pid
)
664 rc
= netlink_unicast(nls
, skb
, pid
, MSG_DONTWAIT
);
666 mempool_free(skb
, zone
->pool
);
667 printk(KERN_ERR
"iscsi: can not unicast skb (%d)\n", rc
);
671 spin_lock_irqsave(&zone
->freelock
, flags
);
672 INIT_LIST_HEAD(skb_to_lh(skb
));
673 list_add(skb_to_lh(skb
), &zone
->freequeue
);
674 spin_unlock_irqrestore(&zone
->freelock
, flags
);
679 int iscsi_recv_pdu(struct iscsi_cls_conn
*conn
, struct iscsi_hdr
*hdr
,
680 char *data
, uint32_t data_size
)
682 struct nlmsghdr
*nlh
;
684 struct iscsi_uevent
*ev
;
686 struct iscsi_internal
*priv
;
687 int len
= NLMSG_SPACE(sizeof(*ev
) + sizeof(struct iscsi_hdr
) +
690 priv
= iscsi_if_transport_lookup(conn
->transport
);
694 mempool_zone_complete(conn
->z_pdu
);
696 skb
= mempool_zone_get_skb(conn
->z_pdu
);
698 iscsi_conn_error(conn
, ISCSI_ERR_CONN_FAILED
);
699 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not deliver "
700 "control PDU: OOM\n");
704 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
705 ev
= NLMSG_DATA(nlh
);
706 memset(ev
, 0, sizeof(*ev
));
707 ev
->transport_handle
= iscsi_handle(conn
->transport
);
708 ev
->type
= ISCSI_KEVENT_RECV_PDU
;
709 if (atomic_read(&conn
->z_pdu
->allocated
) >= conn
->z_pdu
->hiwat
)
710 ev
->iferror
= -ENOMEM
;
711 ev
->r
.recv_req
.cid
= conn
->cid
;
712 ev
->r
.recv_req
.sid
= iscsi_conn_get_sid(conn
);
713 pdu
= (char*)ev
+ sizeof(*ev
);
714 memcpy(pdu
, hdr
, sizeof(struct iscsi_hdr
));
715 memcpy(pdu
+ sizeof(struct iscsi_hdr
), data
, data_size
);
717 return iscsi_unicast_skb(conn
->z_pdu
, skb
, priv
->daemon_pid
);
719 EXPORT_SYMBOL_GPL(iscsi_recv_pdu
);
721 void iscsi_conn_error(struct iscsi_cls_conn
*conn
, enum iscsi_err error
)
723 struct nlmsghdr
*nlh
;
725 struct iscsi_uevent
*ev
;
726 struct iscsi_internal
*priv
;
727 int len
= NLMSG_SPACE(sizeof(*ev
));
729 priv
= iscsi_if_transport_lookup(conn
->transport
);
733 mempool_zone_complete(conn
->z_error
);
735 skb
= mempool_zone_get_skb(conn
->z_error
);
737 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: gracefully ignored "
738 "conn error (%d)\n", error
);
742 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
743 ev
= NLMSG_DATA(nlh
);
744 ev
->transport_handle
= iscsi_handle(conn
->transport
);
745 ev
->type
= ISCSI_KEVENT_CONN_ERROR
;
746 if (atomic_read(&conn
->z_error
->allocated
) >= conn
->z_error
->hiwat
)
747 ev
->iferror
= -ENOMEM
;
748 ev
->r
.connerror
.error
= error
;
749 ev
->r
.connerror
.cid
= conn
->cid
;
750 ev
->r
.connerror
.sid
= iscsi_conn_get_sid(conn
);
752 iscsi_broadcast_skb(conn
->z_error
, skb
);
754 dev_printk(KERN_INFO
, &conn
->dev
, "iscsi: detected conn error (%d)\n",
757 EXPORT_SYMBOL_GPL(iscsi_conn_error
);
760 iscsi_if_send_reply(int pid
, int seq
, int type
, int done
, int multi
,
761 void *payload
, int size
)
764 struct nlmsghdr
*nlh
;
765 int len
= NLMSG_SPACE(size
);
766 int flags
= multi
? NLM_F_MULTI
: 0;
767 int t
= done
? NLMSG_DONE
: type
;
769 mempool_zone_complete(z_reply
);
771 skb
= mempool_zone_get_skb(z_reply
);
774 * user is supposed to react on iferror == -ENOMEM;
779 nlh
= __nlmsg_put(skb
, pid
, seq
, t
, (len
- sizeof(*nlh
)), 0);
780 nlh
->nlmsg_flags
= flags
;
781 memcpy(NLMSG_DATA(nlh
), payload
, size
);
782 return iscsi_unicast_skb(z_reply
, skb
, pid
);
786 iscsi_if_get_stats(struct iscsi_transport
*transport
, struct nlmsghdr
*nlh
)
788 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
789 struct iscsi_stats
*stats
;
790 struct sk_buff
*skbstat
;
791 struct iscsi_cls_conn
*conn
;
792 struct nlmsghdr
*nlhstat
;
793 struct iscsi_uevent
*evstat
;
794 struct iscsi_internal
*priv
;
795 int len
= NLMSG_SPACE(sizeof(*ev
) +
796 sizeof(struct iscsi_stats
) +
797 sizeof(struct iscsi_stats_custom
) *
798 ISCSI_STATS_CUSTOM_MAX
);
801 priv
= iscsi_if_transport_lookup(transport
);
805 conn
= iscsi_conn_lookup(ev
->u
.get_stats
.sid
, ev
->u
.get_stats
.cid
);
812 mempool_zone_complete(conn
->z_pdu
);
814 skbstat
= mempool_zone_get_skb(conn
->z_pdu
);
816 dev_printk(KERN_ERR
, &conn
->dev
, "iscsi: can not "
817 "deliver stats: OOM\n");
821 nlhstat
= __nlmsg_put(skbstat
, priv
->daemon_pid
, 0, 0,
822 (len
- sizeof(*nlhstat
)), 0);
823 evstat
= NLMSG_DATA(nlhstat
);
824 memset(evstat
, 0, sizeof(*evstat
));
825 evstat
->transport_handle
= iscsi_handle(conn
->transport
);
826 evstat
->type
= nlh
->nlmsg_type
;
827 if (atomic_read(&conn
->z_pdu
->allocated
) >= conn
->z_pdu
->hiwat
)
828 evstat
->iferror
= -ENOMEM
;
829 evstat
->u
.get_stats
.cid
=
831 evstat
->u
.get_stats
.sid
=
833 stats
= (struct iscsi_stats
*)
834 ((char*)evstat
+ sizeof(*evstat
));
835 memset(stats
, 0, sizeof(*stats
));
837 transport
->get_stats(conn
, stats
);
838 actual_size
= NLMSG_SPACE(sizeof(struct iscsi_uevent
) +
839 sizeof(struct iscsi_stats
) +
840 sizeof(struct iscsi_stats_custom
) *
841 stats
->custom_length
);
842 actual_size
-= sizeof(*nlhstat
);
843 actual_size
= NLMSG_LENGTH(actual_size
);
844 skb_trim(skbstat
, NLMSG_ALIGN(actual_size
));
845 nlhstat
->nlmsg_len
= actual_size
;
847 err
= iscsi_unicast_skb(conn
->z_pdu
, skbstat
, priv
->daemon_pid
);
848 } while (err
< 0 && err
!= -ECONNREFUSED
);
854 * iscsi_if_destroy_session_done - send session destr. completion event
855 * @conn: last connection for session
857 * This is called by HW iscsi LLDs to notify userpsace that its HW has
860 int iscsi_if_destroy_session_done(struct iscsi_cls_conn
*conn
)
862 struct iscsi_internal
*priv
;
863 struct iscsi_cls_session
*session
;
864 struct Scsi_Host
*shost
;
865 struct iscsi_uevent
*ev
;
867 struct nlmsghdr
*nlh
;
869 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
871 priv
= iscsi_if_transport_lookup(conn
->transport
);
875 session
= iscsi_dev_to_session(conn
->dev
.parent
);
876 shost
= iscsi_session_to_shost(session
);
878 mempool_zone_complete(conn
->z_pdu
);
880 skb
= mempool_zone_get_skb(conn
->z_pdu
);
882 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
883 "session creation event\n");
887 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
888 ev
= NLMSG_DATA(nlh
);
889 ev
->transport_handle
= iscsi_handle(conn
->transport
);
890 ev
->type
= ISCSI_KEVENT_DESTROY_SESSION
;
891 ev
->r
.d_session
.host_no
= shost
->host_no
;
892 ev
->r
.d_session
.sid
= session
->sid
;
895 * this will occur if the daemon is not up, so we just warn
896 * the user and when the daemon is restarted it will handle it
898 rc
= iscsi_broadcast_skb(conn
->z_pdu
, skb
);
900 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
901 "session destruction event. Check iscsi daemon\n");
903 spin_lock_irqsave(&sesslock
, flags
);
904 list_del(&session
->sess_list
);
905 spin_unlock_irqrestore(&sesslock
, flags
);
907 spin_lock_irqsave(&connlock
, flags
);
909 list_del(&conn
->conn_list
);
910 spin_unlock_irqrestore(&connlock
, flags
);
914 EXPORT_SYMBOL_GPL(iscsi_if_destroy_session_done
);
917 * iscsi_if_create_session_done - send session creation completion event
918 * @conn: leading connection for session
920 * This is called by HW iscsi LLDs to notify userpsace that its HW has
921 * created a session or a existing session is back in the logged in state.
923 int iscsi_if_create_session_done(struct iscsi_cls_conn
*conn
)
925 struct iscsi_internal
*priv
;
926 struct iscsi_cls_session
*session
;
927 struct Scsi_Host
*shost
;
928 struct iscsi_uevent
*ev
;
930 struct nlmsghdr
*nlh
;
932 int rc
, len
= NLMSG_SPACE(sizeof(*ev
));
934 priv
= iscsi_if_transport_lookup(conn
->transport
);
938 session
= iscsi_dev_to_session(conn
->dev
.parent
);
939 shost
= iscsi_session_to_shost(session
);
941 mempool_zone_complete(conn
->z_pdu
);
943 skb
= mempool_zone_get_skb(conn
->z_pdu
);
945 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
946 "session creation event\n");
950 nlh
= __nlmsg_put(skb
, priv
->daemon_pid
, 0, 0, (len
- sizeof(*nlh
)), 0);
951 ev
= NLMSG_DATA(nlh
);
952 ev
->transport_handle
= iscsi_handle(conn
->transport
);
953 ev
->type
= ISCSI_UEVENT_CREATE_SESSION
;
954 ev
->r
.c_session_ret
.host_no
= shost
->host_no
;
955 ev
->r
.c_session_ret
.sid
= session
->sid
;
958 * this will occur if the daemon is not up, so we just warn
959 * the user and when the daemon is restarted it will handle it
961 rc
= iscsi_broadcast_skb(conn
->z_pdu
, skb
);
963 dev_printk(KERN_ERR
, &conn
->dev
, "Cannot notify userspace of "
964 "session creation event. Check iscsi daemon\n");
966 spin_lock_irqsave(&sesslock
, flags
);
967 list_add(&session
->sess_list
, &sesslist
);
968 spin_unlock_irqrestore(&sesslock
, flags
);
970 spin_lock_irqsave(&connlock
, flags
);
971 list_add(&conn
->conn_list
, &connlist
);
973 spin_unlock_irqrestore(&connlock
, flags
);
976 EXPORT_SYMBOL_GPL(iscsi_if_create_session_done
);
979 iscsi_if_create_session(struct iscsi_internal
*priv
, struct iscsi_uevent
*ev
)
981 struct iscsi_transport
*transport
= priv
->iscsi_transport
;
982 struct iscsi_cls_session
*session
;
986 session
= transport
->create_session(transport
, &priv
->t
,
987 ev
->u
.c_session
.initial_cmdsn
,
992 spin_lock_irqsave(&sesslock
, flags
);
993 list_add(&session
->sess_list
, &sesslist
);
994 spin_unlock_irqrestore(&sesslock
, flags
);
996 ev
->r
.c_session_ret
.host_no
= hostno
;
997 ev
->r
.c_session_ret
.sid
= session
->sid
;
1002 iscsi_if_create_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1004 struct iscsi_cls_conn
*conn
;
1005 struct iscsi_cls_session
*session
;
1006 unsigned long flags
;
1008 session
= iscsi_session_lookup(ev
->u
.c_conn
.sid
);
1010 printk(KERN_ERR
"iscsi: invalid session %d\n",
1015 conn
= transport
->create_conn(session
, ev
->u
.c_conn
.cid
);
1017 printk(KERN_ERR
"iscsi: couldn't create a new "
1018 "connection for session %d\n",
1023 ev
->r
.c_conn_ret
.sid
= session
->sid
;
1024 ev
->r
.c_conn_ret
.cid
= conn
->cid
;
1026 spin_lock_irqsave(&connlock
, flags
);
1027 list_add(&conn
->conn_list
, &connlist
);
1029 spin_unlock_irqrestore(&connlock
, flags
);
1035 iscsi_if_destroy_conn(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1037 unsigned long flags
;
1038 struct iscsi_cls_conn
*conn
;
1040 conn
= iscsi_conn_lookup(ev
->u
.d_conn
.sid
, ev
->u
.d_conn
.cid
);
1043 spin_lock_irqsave(&connlock
, flags
);
1045 list_del(&conn
->conn_list
);
1046 spin_unlock_irqrestore(&connlock
, flags
);
1048 if (transport
->destroy_conn
)
1049 transport
->destroy_conn(conn
);
1054 iscsi_set_param(struct iscsi_transport
*transport
, struct iscsi_uevent
*ev
)
1056 char *data
= (char*)ev
+ sizeof(*ev
);
1057 struct iscsi_cls_conn
*conn
;
1058 struct iscsi_cls_session
*session
;
1059 int err
= 0, value
= 0;
1061 session
= iscsi_session_lookup(ev
->u
.set_param
.sid
);
1062 conn
= iscsi_conn_lookup(ev
->u
.set_param
.sid
, ev
->u
.set_param
.cid
);
1063 if (!conn
|| !session
)
1066 switch (ev
->u
.set_param
.param
) {
1067 case ISCSI_PARAM_SESS_RECOVERY_TMO
:
1068 sscanf(data
, "%d", &value
);
1070 session
->recovery_tmo
= value
;
1073 err
= transport
->set_param(conn
, ev
->u
.set_param
.param
,
1074 data
, ev
->u
.set_param
.len
);
1081 iscsi_if_transport_ep(struct iscsi_transport
*transport
,
1082 struct iscsi_uevent
*ev
, int msg_type
)
1084 struct sockaddr
*dst_addr
;
1088 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1089 if (!transport
->ep_connect
)
1092 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1093 rc
= transport
->ep_connect(dst_addr
,
1094 ev
->u
.ep_connect
.non_blocking
,
1095 &ev
->r
.ep_connect_ret
.handle
);
1097 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1098 if (!transport
->ep_poll
)
1101 ev
->r
.retcode
= transport
->ep_poll(ev
->u
.ep_poll
.ep_handle
,
1102 ev
->u
.ep_poll
.timeout_ms
);
1104 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1105 if (!transport
->ep_disconnect
)
1108 transport
->ep_disconnect(ev
->u
.ep_disconnect
.ep_handle
);
1115 iscsi_tgt_dscvr(struct iscsi_transport
*transport
,
1116 struct iscsi_uevent
*ev
)
1118 struct sockaddr
*dst_addr
;
1120 if (!transport
->tgt_dscvr
)
1123 dst_addr
= (struct sockaddr
*)((char*)ev
+ sizeof(*ev
));
1124 return transport
->tgt_dscvr(ev
->u
.tgt_dscvr
.type
,
1125 ev
->u
.tgt_dscvr
.host_no
,
1126 ev
->u
.tgt_dscvr
.enable
, dst_addr
);
1130 iscsi_if_recv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
1133 struct iscsi_uevent
*ev
= NLMSG_DATA(nlh
);
1134 struct iscsi_transport
*transport
= NULL
;
1135 struct iscsi_internal
*priv
;
1136 struct iscsi_cls_session
*session
;
1137 struct iscsi_cls_conn
*conn
;
1138 unsigned long flags
;
1140 priv
= iscsi_if_transport_lookup(iscsi_ptr(ev
->transport_handle
));
1143 transport
= priv
->iscsi_transport
;
1145 if (!try_module_get(transport
->owner
))
1148 priv
->daemon_pid
= NETLINK_CREDS(skb
)->pid
;
1150 switch (nlh
->nlmsg_type
) {
1151 case ISCSI_UEVENT_CREATE_SESSION
:
1152 err
= iscsi_if_create_session(priv
, ev
);
1154 case ISCSI_UEVENT_DESTROY_SESSION
:
1155 session
= iscsi_session_lookup(ev
->u
.d_session
.sid
);
1157 spin_lock_irqsave(&sesslock
, flags
);
1158 list_del(&session
->sess_list
);
1159 spin_unlock_irqrestore(&sesslock
, flags
);
1161 transport
->destroy_session(session
);
1165 case ISCSI_UEVENT_CREATE_CONN
:
1166 err
= iscsi_if_create_conn(transport
, ev
);
1168 case ISCSI_UEVENT_DESTROY_CONN
:
1169 err
= iscsi_if_destroy_conn(transport
, ev
);
1171 case ISCSI_UEVENT_BIND_CONN
:
1172 session
= iscsi_session_lookup(ev
->u
.b_conn
.sid
);
1173 conn
= iscsi_conn_lookup(ev
->u
.b_conn
.sid
, ev
->u
.b_conn
.cid
);
1175 if (session
&& conn
)
1176 ev
->r
.retcode
= transport
->bind_conn(session
, conn
,
1177 ev
->u
.b_conn
.transport_eph
,
1178 ev
->u
.b_conn
.is_leading
);
1182 case ISCSI_UEVENT_SET_PARAM
:
1183 err
= iscsi_set_param(transport
, ev
);
1185 case ISCSI_UEVENT_START_CONN
:
1186 conn
= iscsi_conn_lookup(ev
->u
.start_conn
.sid
, ev
->u
.start_conn
.cid
);
1188 ev
->r
.retcode
= transport
->start_conn(conn
);
1192 case ISCSI_UEVENT_STOP_CONN
:
1193 conn
= iscsi_conn_lookup(ev
->u
.stop_conn
.sid
, ev
->u
.stop_conn
.cid
);
1195 transport
->stop_conn(conn
, ev
->u
.stop_conn
.flag
);
1199 case ISCSI_UEVENT_SEND_PDU
:
1200 conn
= iscsi_conn_lookup(ev
->u
.send_pdu
.sid
, ev
->u
.send_pdu
.cid
);
1202 ev
->r
.retcode
= transport
->send_pdu(conn
,
1203 (struct iscsi_hdr
*)((char*)ev
+ sizeof(*ev
)),
1204 (char*)ev
+ sizeof(*ev
) + ev
->u
.send_pdu
.hdr_size
,
1205 ev
->u
.send_pdu
.data_size
);
1209 case ISCSI_UEVENT_GET_STATS
:
1210 err
= iscsi_if_get_stats(transport
, nlh
);
1212 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT
:
1213 case ISCSI_UEVENT_TRANSPORT_EP_POLL
:
1214 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT
:
1215 err
= iscsi_if_transport_ep(transport
, ev
, nlh
->nlmsg_type
);
1217 case ISCSI_UEVENT_TGT_DSCVR
:
1218 err
= iscsi_tgt_dscvr(transport
, ev
);
1225 module_put(transport
->owner
);
1230 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
1231 * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or
1232 * invalid creds are discarded silently.
1235 iscsi_if_rx(struct sock
*sk
, int len
)
1237 struct sk_buff
*skb
;
1239 mutex_lock(&rx_queue_mutex
);
1240 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
1241 if (NETLINK_CREDS(skb
)->uid
) {
1242 skb_pull(skb
, skb
->len
);
1246 while (skb
->len
>= NLMSG_SPACE(0)) {
1249 struct nlmsghdr
*nlh
;
1250 struct iscsi_uevent
*ev
;
1252 nlh
= (struct nlmsghdr
*)skb
->data
;
1253 if (nlh
->nlmsg_len
< sizeof(*nlh
) ||
1254 skb
->len
< nlh
->nlmsg_len
) {
1258 ev
= NLMSG_DATA(nlh
);
1259 rlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
1260 if (rlen
> skb
->len
)
1263 err
= iscsi_if_recv_msg(skb
, nlh
);
1265 ev
->type
= ISCSI_KEVENT_IF_ERROR
;
1270 * special case for GET_STATS:
1271 * on success - sending reply and stats from
1272 * inside of if_recv_msg(),
1273 * on error - fall through.
1275 if (ev
->type
== ISCSI_UEVENT_GET_STATS
&& !err
)
1277 err
= iscsi_if_send_reply(
1278 NETLINK_CREDS(skb
)->pid
, nlh
->nlmsg_seq
,
1279 nlh
->nlmsg_type
, 0, 0, ev
, sizeof(*ev
));
1280 if (atomic_read(&z_reply
->allocated
) >=
1282 ev
->iferror
= -ENOMEM
;
1283 } while (err
< 0 && err
!= -ECONNREFUSED
);
1284 skb_pull(skb
, rlen
);
1289 mutex_unlock(&rx_queue_mutex
);
1292 #define iscsi_cdev_to_conn(_cdev) \
1293 iscsi_dev_to_conn(_cdev->dev)
1295 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1296 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1297 __ATTR(_name,_mode,_show,_store)
1300 * iSCSI connection attrs
1302 #define iscsi_conn_attr_show(param) \
1304 show_conn_param_##param(struct class_device *cdev, char *buf) \
1306 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1307 struct iscsi_transport *t = conn->transport; \
1308 return t->get_conn_param(conn, param, buf); \
1311 #define iscsi_conn_attr(field, param) \
1312 iscsi_conn_attr_show(param) \
1313 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1316 iscsi_conn_attr(max_recv_dlength
, ISCSI_PARAM_MAX_RECV_DLENGTH
);
1317 iscsi_conn_attr(max_xmit_dlength
, ISCSI_PARAM_MAX_XMIT_DLENGTH
);
1318 iscsi_conn_attr(header_digest
, ISCSI_PARAM_HDRDGST_EN
);
1319 iscsi_conn_attr(data_digest
, ISCSI_PARAM_DATADGST_EN
);
1320 iscsi_conn_attr(ifmarker
, ISCSI_PARAM_IFMARKER_EN
);
1321 iscsi_conn_attr(ofmarker
, ISCSI_PARAM_OFMARKER_EN
);
1322 iscsi_conn_attr(persistent_port
, ISCSI_PARAM_PERSISTENT_PORT
);
1323 iscsi_conn_attr(port
, ISCSI_PARAM_CONN_PORT
);
1324 iscsi_conn_attr(exp_statsn
, ISCSI_PARAM_EXP_STATSN
);
1325 iscsi_conn_attr(persistent_address
, ISCSI_PARAM_PERSISTENT_ADDRESS
);
1326 iscsi_conn_attr(address
, ISCSI_PARAM_CONN_ADDRESS
);
1328 #define iscsi_cdev_to_session(_cdev) \
1329 iscsi_dev_to_session(_cdev->dev)
1332 * iSCSI session attrs
1334 #define iscsi_session_attr_show(param) \
1336 show_session_param_##param(struct class_device *cdev, char *buf) \
1338 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1339 struct iscsi_transport *t = session->transport; \
1340 return t->get_session_param(session, param, buf); \
1343 #define iscsi_session_attr(field, param) \
1344 iscsi_session_attr_show(param) \
1345 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1348 iscsi_session_attr(targetname
, ISCSI_PARAM_TARGET_NAME
);
1349 iscsi_session_attr(initial_r2t
, ISCSI_PARAM_INITIAL_R2T_EN
);
1350 iscsi_session_attr(max_outstanding_r2t
, ISCSI_PARAM_MAX_R2T
);
1351 iscsi_session_attr(immediate_data
, ISCSI_PARAM_IMM_DATA_EN
);
1352 iscsi_session_attr(first_burst_len
, ISCSI_PARAM_FIRST_BURST
);
1353 iscsi_session_attr(max_burst_len
, ISCSI_PARAM_MAX_BURST
);
1354 iscsi_session_attr(data_pdu_in_order
, ISCSI_PARAM_PDU_INORDER_EN
);
1355 iscsi_session_attr(data_seq_in_order
, ISCSI_PARAM_DATASEQ_INORDER_EN
);
1356 iscsi_session_attr(erl
, ISCSI_PARAM_ERL
);
1357 iscsi_session_attr(tpgt
, ISCSI_PARAM_TPGT
);
1359 #define iscsi_priv_session_attr_show(field, format) \
1361 show_priv_session_##field(struct class_device *cdev, char *buf) \
1363 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\
1364 return sprintf(buf, format"\n", session->field); \
1367 #define iscsi_priv_session_attr(field, format) \
1368 iscsi_priv_session_attr_show(field, format) \
1369 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1371 iscsi_priv_session_attr(recovery_tmo
, "%d");
1373 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1375 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1380 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1382 if (tt->param_mask & param_flag) { \
1383 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1388 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1390 if (tt->param_mask & param_flag) { \
1391 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1396 static int iscsi_session_match(struct attribute_container
*cont
,
1399 struct iscsi_cls_session
*session
;
1400 struct Scsi_Host
*shost
;
1401 struct iscsi_internal
*priv
;
1403 if (!iscsi_is_session_dev(dev
))
1406 session
= iscsi_dev_to_session(dev
);
1407 shost
= iscsi_session_to_shost(session
);
1408 if (!shost
->transportt
)
1411 priv
= to_iscsi_internal(shost
->transportt
);
1412 if (priv
->session_cont
.ac
.class != &iscsi_session_class
.class)
1415 return &priv
->session_cont
.ac
== cont
;
1418 static int iscsi_conn_match(struct attribute_container
*cont
,
1421 struct iscsi_cls_session
*session
;
1422 struct iscsi_cls_conn
*conn
;
1423 struct Scsi_Host
*shost
;
1424 struct iscsi_internal
*priv
;
1426 if (!iscsi_is_conn_dev(dev
))
1429 conn
= iscsi_dev_to_conn(dev
);
1430 session
= iscsi_dev_to_session(conn
->dev
.parent
);
1431 shost
= iscsi_session_to_shost(session
);
1433 if (!shost
->transportt
)
1436 priv
= to_iscsi_internal(shost
->transportt
);
1437 if (priv
->conn_cont
.ac
.class != &iscsi_connection_class
.class)
1440 return &priv
->conn_cont
.ac
== cont
;
1443 static int iscsi_host_match(struct attribute_container
*cont
,
1446 struct Scsi_Host
*shost
;
1447 struct iscsi_internal
*priv
;
1449 if (!scsi_is_host_device(dev
))
1452 shost
= dev_to_shost(dev
);
1453 if (!shost
->transportt
||
1454 shost
->transportt
->host_attrs
.ac
.class != &iscsi_host_class
.class)
1457 priv
= to_iscsi_internal(shost
->transportt
);
1458 return &priv
->t
.host_attrs
.ac
== cont
;
1461 struct scsi_transport_template
*
1462 iscsi_register_transport(struct iscsi_transport
*tt
)
1464 struct iscsi_internal
*priv
;
1465 unsigned long flags
;
1470 priv
= iscsi_if_transport_lookup(tt
);
1474 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1477 INIT_LIST_HEAD(&priv
->list
);
1478 priv
->daemon_pid
= -1;
1479 priv
->iscsi_transport
= tt
;
1480 priv
->t
.user_scan
= iscsi_user_scan
;
1482 priv
->cdev
.class = &iscsi_transport_class
;
1483 snprintf(priv
->cdev
.class_id
, BUS_ID_SIZE
, "%s", tt
->name
);
1484 err
= class_device_register(&priv
->cdev
);
1488 err
= sysfs_create_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1490 goto unregister_cdev
;
1492 /* host parameters */
1493 priv
->t
.host_attrs
.ac
.attrs
= &priv
->host_attrs
[0];
1494 priv
->t
.host_attrs
.ac
.class = &iscsi_host_class
.class;
1495 priv
->t
.host_attrs
.ac
.match
= iscsi_host_match
;
1496 priv
->t
.host_size
= sizeof(struct iscsi_host
);
1497 priv
->host_attrs
[0] = NULL
;
1498 transport_container_register(&priv
->t
.host_attrs
);
1500 /* connection parameters */
1501 priv
->conn_cont
.ac
.attrs
= &priv
->conn_attrs
[0];
1502 priv
->conn_cont
.ac
.class = &iscsi_connection_class
.class;
1503 priv
->conn_cont
.ac
.match
= iscsi_conn_match
;
1504 transport_container_register(&priv
->conn_cont
);
1506 SETUP_CONN_RD_ATTR(max_recv_dlength
, ISCSI_MAX_RECV_DLENGTH
);
1507 SETUP_CONN_RD_ATTR(max_xmit_dlength
, ISCSI_MAX_XMIT_DLENGTH
);
1508 SETUP_CONN_RD_ATTR(header_digest
, ISCSI_HDRDGST_EN
);
1509 SETUP_CONN_RD_ATTR(data_digest
, ISCSI_DATADGST_EN
);
1510 SETUP_CONN_RD_ATTR(ifmarker
, ISCSI_IFMARKER_EN
);
1511 SETUP_CONN_RD_ATTR(ofmarker
, ISCSI_OFMARKER_EN
);
1512 SETUP_CONN_RD_ATTR(address
, ISCSI_CONN_ADDRESS
);
1513 SETUP_CONN_RD_ATTR(port
, ISCSI_CONN_PORT
);
1514 SETUP_CONN_RD_ATTR(exp_statsn
, ISCSI_EXP_STATSN
);
1515 SETUP_CONN_RD_ATTR(persistent_address
, ISCSI_PERSISTENT_ADDRESS
);
1516 SETUP_CONN_RD_ATTR(persistent_port
, ISCSI_PERSISTENT_PORT
);
1518 BUG_ON(count
> ISCSI_CONN_ATTRS
);
1519 priv
->conn_attrs
[count
] = NULL
;
1522 /* session parameters */
1523 priv
->session_cont
.ac
.attrs
= &priv
->session_attrs
[0];
1524 priv
->session_cont
.ac
.class = &iscsi_session_class
.class;
1525 priv
->session_cont
.ac
.match
= iscsi_session_match
;
1526 transport_container_register(&priv
->session_cont
);
1528 SETUP_SESSION_RD_ATTR(initial_r2t
, ISCSI_INITIAL_R2T_EN
);
1529 SETUP_SESSION_RD_ATTR(max_outstanding_r2t
, ISCSI_MAX_R2T
);
1530 SETUP_SESSION_RD_ATTR(immediate_data
, ISCSI_IMM_DATA_EN
);
1531 SETUP_SESSION_RD_ATTR(first_burst_len
, ISCSI_FIRST_BURST
);
1532 SETUP_SESSION_RD_ATTR(max_burst_len
, ISCSI_MAX_BURST
);
1533 SETUP_SESSION_RD_ATTR(data_pdu_in_order
, ISCSI_PDU_INORDER_EN
);
1534 SETUP_SESSION_RD_ATTR(data_seq_in_order
, ISCSI_DATASEQ_INORDER_EN
);
1535 SETUP_SESSION_RD_ATTR(erl
, ISCSI_ERL
);
1536 SETUP_SESSION_RD_ATTR(targetname
, ISCSI_TARGET_NAME
);
1537 SETUP_SESSION_RD_ATTR(tpgt
, ISCSI_TPGT
);
1538 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo
);
1540 BUG_ON(count
> ISCSI_SESSION_ATTRS
);
1541 priv
->session_attrs
[count
] = NULL
;
1543 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1544 list_add(&priv
->list
, &iscsi_transports
);
1545 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1547 printk(KERN_NOTICE
"iscsi: registered transport (%s)\n", tt
->name
);
1551 class_device_unregister(&priv
->cdev
);
1556 EXPORT_SYMBOL_GPL(iscsi_register_transport
);
1558 int iscsi_unregister_transport(struct iscsi_transport
*tt
)
1560 struct iscsi_internal
*priv
;
1561 unsigned long flags
;
1565 mutex_lock(&rx_queue_mutex
);
1567 priv
= iscsi_if_transport_lookup(tt
);
1570 spin_lock_irqsave(&iscsi_transport_lock
, flags
);
1571 list_del(&priv
->list
);
1572 spin_unlock_irqrestore(&iscsi_transport_lock
, flags
);
1574 transport_container_unregister(&priv
->conn_cont
);
1575 transport_container_unregister(&priv
->session_cont
);
1576 transport_container_unregister(&priv
->t
.host_attrs
);
1578 sysfs_remove_group(&priv
->cdev
.kobj
, &iscsi_transport_group
);
1579 class_device_unregister(&priv
->cdev
);
1580 mutex_unlock(&rx_queue_mutex
);
1584 EXPORT_SYMBOL_GPL(iscsi_unregister_transport
);
1587 iscsi_rcv_nl_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1589 struct netlink_notify
*n
= ptr
;
1591 if (event
== NETLINK_URELEASE
&&
1592 n
->protocol
== NETLINK_ISCSI
&& n
->pid
) {
1593 struct iscsi_cls_conn
*conn
;
1594 unsigned long flags
;
1596 mempool_zone_complete(z_reply
);
1597 spin_lock_irqsave(&connlock
, flags
);
1598 list_for_each_entry(conn
, &connlist
, conn_list
) {
1599 mempool_zone_complete(conn
->z_error
);
1600 mempool_zone_complete(conn
->z_pdu
);
1602 spin_unlock_irqrestore(&connlock
, flags
);
1608 static struct notifier_block iscsi_nl_notifier
= {
1609 .notifier_call
= iscsi_rcv_nl_event
,
1612 static __init
int iscsi_transport_init(void)
1616 err
= class_register(&iscsi_transport_class
);
1620 err
= transport_class_register(&iscsi_host_class
);
1622 goto unregister_transport_class
;
1624 err
= transport_class_register(&iscsi_connection_class
);
1626 goto unregister_host_class
;
1628 err
= transport_class_register(&iscsi_session_class
);
1630 goto unregister_conn_class
;
1632 err
= netlink_register_notifier(&iscsi_nl_notifier
);
1634 goto unregister_session_class
;
1636 nls
= netlink_kernel_create(NETLINK_ISCSI
, 1, iscsi_if_rx
,
1640 goto unregister_notifier
;
1643 z_reply
= mempool_zone_init(Z_MAX_REPLY
,
1644 NLMSG_SPACE(sizeof(struct iscsi_uevent
)), Z_HIWAT_REPLY
);
1648 sock_release(nls
->sk_socket
);
1649 unregister_notifier
:
1650 netlink_unregister_notifier(&iscsi_nl_notifier
);
1651 unregister_session_class
:
1652 transport_class_unregister(&iscsi_session_class
);
1653 unregister_conn_class
:
1654 transport_class_unregister(&iscsi_connection_class
);
1655 unregister_host_class
:
1656 transport_class_unregister(&iscsi_host_class
);
1657 unregister_transport_class
:
1658 class_unregister(&iscsi_transport_class
);
1662 static void __exit
iscsi_transport_exit(void)
1664 mempool_zone_destroy(z_reply
);
1665 sock_release(nls
->sk_socket
);
1666 netlink_unregister_notifier(&iscsi_nl_notifier
);
1667 transport_class_unregister(&iscsi_connection_class
);
1668 transport_class_unregister(&iscsi_session_class
);
1669 transport_class_unregister(&iscsi_host_class
);
1670 class_unregister(&iscsi_transport_class
);
1673 module_init(iscsi_transport_init
);
1674 module_exit(iscsi_transport_exit
);
1676 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1677 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1678 "Alex Aizman <itn780@yahoo.com>");
1679 MODULE_DESCRIPTION("iSCSI Transport Interface");
1680 MODULE_LICENSE("GPL");