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[SCSI] iscsi class: user device_for_each_child instead of duplicating session list
[linux-2.6/x86.git] / drivers / scsi / scsi_transport_iscsi.c
blobac9d298f54e7f8390bb1a0ad42f04a82aad119d3
1 /*
2 * iSCSI transport class definitions
3 *
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
8 *
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.
13 *
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.
18 *
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.
22 */
23 #include <linux/module.h>
24 #include <linux/mutex.h>
25 #include <net/tcp.h>
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_host.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/scsi_transport.h>
30 #include <scsi/scsi_transport_iscsi.h>
31 #include <scsi/iscsi_if.h>
32
33 #define ISCSI_SESSION_ATTRS 19
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
36 #define ISCSI_TRANSPORT_VERSION "2.0-869"
37
38 struct iscsi_internal {
39 int daemon_pid;
40 struct scsi_transport_template t;
41 struct iscsi_transport *iscsi_transport;
42 struct list_head list;
43 struct device dev;
44
45 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
50 };
51
52 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
53 static struct workqueue_struct *iscsi_eh_timer_workq;
54
55 /*
56 * list of registered transports and lock that must
57 * be held while accessing list. The iscsi_transport_lock must
58 * be acquired after the rx_queue_mutex.
59 */
60 static LIST_HEAD(iscsi_transports);
61 static DEFINE_SPINLOCK(iscsi_transport_lock);
62
63 #define to_iscsi_internal(tmpl) \
64 container_of(tmpl, struct iscsi_internal, t)
65
66 #define dev_to_iscsi_internal(_dev) \
67 container_of(_dev, struct iscsi_internal, dev)
68
69 static void iscsi_transport_release(struct device *dev)
70 {
71 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
72 kfree(priv);
73 }
74
75 /*
76 * iscsi_transport_class represents the iscsi_transports that are
77 * registered.
78 */
79 static struct class iscsi_transport_class = {
80 .name = "iscsi_transport",
81 .dev_release = iscsi_transport_release,
82 };
83
84 static ssize_t
85 show_transport_handle(struct device *dev, struct device_attribute *attr,
86 char *buf)
87 {
88 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
89 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
90 }
91 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
92
93 #define show_transport_attr(name, format) \
94 static ssize_t \
95 show_transport_##name(struct device *dev, \
96 struct device_attribute *attr,char *buf) \
97 { \
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
99 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
100 } \
101 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
102
103 show_transport_attr(caps, "0x%x");
104
105 static struct attribute *iscsi_transport_attrs[] = {
106 &dev_attr_handle.attr,
107 &dev_attr_caps.attr,
108 NULL,
109 };
110
111 static struct attribute_group iscsi_transport_group = {
112 .attrs = iscsi_transport_attrs,
113 };
114
115 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
116 struct device *cdev)
117 {
118 struct Scsi_Host *shost = dev_to_shost(dev);
119 struct iscsi_cls_host *ihost = shost->shost_data;
120
121 memset(ihost, 0, sizeof(*ihost));
122 atomic_set(&ihost->nr_scans, 0);
123 mutex_init(&ihost->mutex);
124
125 snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
126 shost->host_no);
127 ihost->scan_workq = create_singlethread_workqueue(
128 ihost->scan_workq_name);
129 if (!ihost->scan_workq)
130 return -ENOMEM;
131 return 0;
132 }
133
134 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
135 struct device *cdev)
136 {
137 struct Scsi_Host *shost = dev_to_shost(dev);
138 struct iscsi_cls_host *ihost = shost->shost_data;
139
140 destroy_workqueue(ihost->scan_workq);
141 return 0;
142 }
143
144 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
145 "iscsi_host",
146 iscsi_setup_host,
147 iscsi_remove_host,
148 NULL);
149
150 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
151 "iscsi_session",
152 NULL,
153 NULL,
154 NULL);
155
156 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
157 "iscsi_connection",
158 NULL,
159 NULL,
160 NULL);
161
162 static struct sock *nls;
163 static DEFINE_MUTEX(rx_queue_mutex);
164
165 static LIST_HEAD(sesslist);
166 static DEFINE_SPINLOCK(sesslock);
167 static LIST_HEAD(connlist);
168 static DEFINE_SPINLOCK(connlock);
169
170 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
171 {
172 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
173 return sess->sid;
174 }
175
176 /*
177 * Returns the matching session to a given sid
178 */
179 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
180 {
181 unsigned long flags;
182 struct iscsi_cls_session *sess;
183
184 spin_lock_irqsave(&sesslock, flags);
185 list_for_each_entry(sess, &sesslist, sess_list) {
186 if (sess->sid == sid) {
187 spin_unlock_irqrestore(&sesslock, flags);
188 return sess;
189 }
190 }
191 spin_unlock_irqrestore(&sesslock, flags);
192 return NULL;
193 }
194
195 /*
196 * Returns the matching connection to a given sid / cid tuple
197 */
198 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
199 {
200 unsigned long flags;
201 struct iscsi_cls_conn *conn;
202
203 spin_lock_irqsave(&connlock, flags);
204 list_for_each_entry(conn, &connlist, conn_list) {
205 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
206 spin_unlock_irqrestore(&connlock, flags);
207 return conn;
208 }
209 }
210 spin_unlock_irqrestore(&connlock, flags);
211 return NULL;
212 }
213
214 /*
215 * The following functions can be used by LLDs that allocate
216 * their own scsi_hosts or by software iscsi LLDs
217 */
218 static struct {
219 int value;
220 char *name;
221 } iscsi_session_state_names[] = {
222 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
223 { ISCSI_SESSION_FAILED, "FAILED" },
224 { ISCSI_SESSION_FREE, "FREE" },
225 };
226
227 static const char *iscsi_session_state_name(int state)
228 {
229 int i;
230 char *name = NULL;
231
232 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
233 if (iscsi_session_state_names[i].value == state) {
234 name = iscsi_session_state_names[i].name;
235 break;
236 }
237 }
238 return name;
239 }
240
241 int iscsi_session_chkready(struct iscsi_cls_session *session)
242 {
243 unsigned long flags;
244 int err;
245
246 spin_lock_irqsave(&session->lock, flags);
247 switch (session->state) {
248 case ISCSI_SESSION_LOGGED_IN:
249 err = 0;
250 break;
251 case ISCSI_SESSION_FAILED:
252 err = DID_IMM_RETRY << 16;
253 break;
254 case ISCSI_SESSION_FREE:
255 err = DID_NO_CONNECT << 16;
256 break;
257 default:
258 err = DID_NO_CONNECT << 16;
259 break;
260 }
261 spin_unlock_irqrestore(&session->lock, flags);
262 return err;
263 }
264 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
265
266 static void iscsi_session_release(struct device *dev)
267 {
268 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
269 struct Scsi_Host *shost;
270
271 shost = iscsi_session_to_shost(session);
272 scsi_host_put(shost);
273 kfree(session);
274 }
275
276 static int iscsi_is_session_dev(const struct device *dev)
277 {
278 return dev->release == iscsi_session_release;
279 }
280
281 static int iscsi_iter_session_fn(struct device *dev, void *data)
282 {
283 void (* fn) (struct iscsi_cls_session *) = data;
284
285 if (!iscsi_is_session_dev(dev))
286 return 0;
287 fn(iscsi_dev_to_session(dev));
288 return 0;
289 }
290
291 void iscsi_host_for_each_session(struct Scsi_Host *shost,
292 void (*fn)(struct iscsi_cls_session *))
293 {
294 device_for_each_child(&shost->shost_gendev, fn,
295 iscsi_iter_session_fn);
296 }
297 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
298
299 /**
300 * iscsi_scan_finished - helper to report when running scans are done
301 * @shost: scsi host
302 * @time: scan run time
303 *
304 * This function can be used by drives like qla4xxx to report to the scsi
305 * layer when the scans it kicked off at module load time are done.
306 */
307 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
308 {
309 struct iscsi_cls_host *ihost = shost->shost_data;
310 /*
311 * qla4xxx will have kicked off some session unblocks before calling
312 * scsi_scan_host, so just wait for them to complete.
313 */
314 return !atomic_read(&ihost->nr_scans);
315 }
316 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
317
318 struct iscsi_scan_data {
319 unsigned int channel;
320 unsigned int id;
321 unsigned int lun;
322 };
323
324 static int iscsi_user_scan_session(struct device *dev, void *data)
325 {
326 struct iscsi_scan_data *scan_data = data;
327 struct iscsi_cls_session *session;
328 struct Scsi_Host *shost;
329 struct iscsi_cls_host *ihost;
330 unsigned long flags;
331 unsigned int id;
332
333 if (!iscsi_is_session_dev(dev))
334 return 0;
335
336 session = iscsi_dev_to_session(dev);
337 shost = iscsi_session_to_shost(session);
338 ihost = shost->shost_data;
339
340 mutex_lock(&ihost->mutex);
341 spin_lock_irqsave(&session->lock, flags);
342 if (session->state != ISCSI_SESSION_LOGGED_IN) {
343 spin_unlock_irqrestore(&session->lock, flags);
344 mutex_unlock(&ihost->mutex);
345 return 0;
346 }
347 id = session->target_id;
348 spin_unlock_irqrestore(&session->lock, flags);
349
350 if (id != ISCSI_MAX_TARGET) {
351 if ((scan_data->channel == SCAN_WILD_CARD ||
352 scan_data->channel == 0) &&
353 (scan_data->id == SCAN_WILD_CARD ||
354 scan_data->id == id))
355 scsi_scan_target(&session->dev, 0, id,
356 scan_data->lun, 1);
357 }
358 mutex_unlock(&ihost->mutex);
359 return 0;
360 }
361
362 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
363 uint id, uint lun)
364 {
365 struct iscsi_scan_data scan_data;
366
367 scan_data.channel = channel;
368 scan_data.id = id;
369 scan_data.lun = lun;
370
371 return device_for_each_child(&shost->shost_gendev, &scan_data,
372 iscsi_user_scan_session);
373 }
374
375 static void iscsi_scan_session(struct work_struct *work)
376 {
377 struct iscsi_cls_session *session =
378 container_of(work, struct iscsi_cls_session, scan_work);
379 struct Scsi_Host *shost = iscsi_session_to_shost(session);
380 struct iscsi_cls_host *ihost = shost->shost_data;
381 struct iscsi_scan_data scan_data;
382
383 scan_data.channel = 0;
384 scan_data.id = SCAN_WILD_CARD;
385 scan_data.lun = SCAN_WILD_CARD;
386
387 iscsi_user_scan_session(&session->dev, &scan_data);
388 atomic_dec(&ihost->nr_scans);
389 }
390
391 static void session_recovery_timedout(struct work_struct *work)
392 {
393 struct iscsi_cls_session *session =
394 container_of(work, struct iscsi_cls_session,
395 recovery_work.work);
396 unsigned long flags;
397
398 iscsi_cls_session_printk(KERN_INFO, session,
399 "session recovery timed out after %d secs\n",
400 session->recovery_tmo);
401
402 spin_lock_irqsave(&session->lock, flags);
403 switch (session->state) {
404 case ISCSI_SESSION_FAILED:
405 session->state = ISCSI_SESSION_FREE;
406 break;
407 case ISCSI_SESSION_LOGGED_IN:
408 case ISCSI_SESSION_FREE:
409 /* we raced with the unblock's flush */
410 spin_unlock_irqrestore(&session->lock, flags);
411 return;
412 }
413 spin_unlock_irqrestore(&session->lock, flags);
414
415 if (session->transport->session_recovery_timedout)
416 session->transport->session_recovery_timedout(session);
417
418 scsi_target_unblock(&session->dev);
419 }
420
421 static void __iscsi_unblock_session(struct work_struct *work)
422 {
423 struct iscsi_cls_session *session =
424 container_of(work, struct iscsi_cls_session,
425 unblock_work);
426 struct Scsi_Host *shost = iscsi_session_to_shost(session);
427 struct iscsi_cls_host *ihost = shost->shost_data;
428 unsigned long flags;
429
430 /*
431 * The recovery and unblock work get run from the same workqueue,
432 * so try to cancel it if it was going to run after this unblock.
433 */
434 cancel_delayed_work(&session->recovery_work);
435 spin_lock_irqsave(&session->lock, flags);
436 session->state = ISCSI_SESSION_LOGGED_IN;
437 spin_unlock_irqrestore(&session->lock, flags);
438 /* start IO */
439 scsi_target_unblock(&session->dev);
440 /*
441 * Only do kernel scanning if the driver is properly hooked into
442 * the async scanning code (drivers like iscsi_tcp do login and
443 * scanning from userspace).
444 */
445 if (shost->hostt->scan_finished) {
446 if (queue_work(ihost->scan_workq, &session->scan_work))
447 atomic_inc(&ihost->nr_scans);
448 }
449 }
450
451 /**
452 * iscsi_unblock_session - set a session as logged in and start IO.
453 * @session: iscsi session
454 *
455 * Mark a session as ready to accept IO.
456 */
457 void iscsi_unblock_session(struct iscsi_cls_session *session)
458 {
459 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
460 /*
461 * make sure all the events have completed before tell the driver
462 * it is safe
463 */
464 flush_workqueue(iscsi_eh_timer_workq);
465 }
466 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
467
468 static void __iscsi_block_session(struct work_struct *work)
469 {
470 struct iscsi_cls_session *session =
471 container_of(work, struct iscsi_cls_session,
472 block_work);
473 unsigned long flags;
474
475 spin_lock_irqsave(&session->lock, flags);
476 session->state = ISCSI_SESSION_FAILED;
477 spin_unlock_irqrestore(&session->lock, flags);
478 scsi_target_block(&session->dev);
479 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
480 session->recovery_tmo * HZ);
481 }
482
483 void iscsi_block_session(struct iscsi_cls_session *session)
484 {
485 queue_work(iscsi_eh_timer_workq, &session->block_work);
486 }
487 EXPORT_SYMBOL_GPL(iscsi_block_session);
488
489 static void __iscsi_unbind_session(struct work_struct *work)
490 {
491 struct iscsi_cls_session *session =
492 container_of(work, struct iscsi_cls_session,
493 unbind_work);
494 struct Scsi_Host *shost = iscsi_session_to_shost(session);
495 struct iscsi_cls_host *ihost = shost->shost_data;
496 unsigned long flags;
497
498 /* Prevent new scans and make sure scanning is not in progress */
499 mutex_lock(&ihost->mutex);
500 spin_lock_irqsave(&session->lock, flags);
501 if (session->target_id == ISCSI_MAX_TARGET) {
502 spin_unlock_irqrestore(&session->lock, flags);
503 mutex_unlock(&ihost->mutex);
504 return;
505 }
506 session->target_id = ISCSI_MAX_TARGET;
507 spin_unlock_irqrestore(&session->lock, flags);
508 mutex_unlock(&ihost->mutex);
509
510 scsi_remove_target(&session->dev);
511 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
512 }
513
514 static int iscsi_unbind_session(struct iscsi_cls_session *session)
515 {
516 struct Scsi_Host *shost = iscsi_session_to_shost(session);
517 struct iscsi_cls_host *ihost = shost->shost_data;
518
519 return queue_work(ihost->scan_workq, &session->unbind_work);
520 }
521
522 struct iscsi_cls_session *
523 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
524 int dd_size)
525 {
526 struct iscsi_cls_session *session;
527
528 session = kzalloc(sizeof(*session) + dd_size,
529 GFP_KERNEL);
530 if (!session)
531 return NULL;
532
533 session->transport = transport;
534 session->recovery_tmo = 120;
535 session->state = ISCSI_SESSION_FREE;
536 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
537 INIT_LIST_HEAD(&session->sess_list);
538 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
539 INIT_WORK(&session->block_work, __iscsi_block_session);
540 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
541 INIT_WORK(&session->scan_work, iscsi_scan_session);
542 spin_lock_init(&session->lock);
543
544 /* this is released in the dev's release function */
545 scsi_host_get(shost);
546 session->dev.parent = &shost->shost_gendev;
547 session->dev.release = iscsi_session_release;
548 device_initialize(&session->dev);
549 if (dd_size)
550 session->dd_data = &session[1];
551 return session;
552 }
553 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
554
555 static int iscsi_get_next_target_id(struct device *dev, void *data)
556 {
557 struct iscsi_cls_session *session;
558 unsigned long flags;
559 int err = 0;
560
561 if (!iscsi_is_session_dev(dev))
562 return 0;
563
564 session = iscsi_dev_to_session(dev);
565 spin_lock_irqsave(&session->lock, flags);
566 if (*((unsigned int *) data) == session->target_id)
567 err = -EEXIST;
568 spin_unlock_irqrestore(&session->lock, flags);
569 return err;
570 }
571
572 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
573 {
574 struct Scsi_Host *shost = iscsi_session_to_shost(session);
575 struct iscsi_cls_host *ihost;
576 unsigned long flags;
577 unsigned int id = target_id;
578 int err;
579
580 ihost = shost->shost_data;
581 session->sid = atomic_add_return(1, &iscsi_session_nr);
582
583 if (id == ISCSI_MAX_TARGET) {
584 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
585 err = device_for_each_child(&shost->shost_gendev, &id,
586 iscsi_get_next_target_id);
587 if (!err)
588 break;
589 }
590
591 if (id == ISCSI_MAX_TARGET) {
592 iscsi_cls_session_printk(KERN_ERR, session,
593 "Too many iscsi targets. Max "
594 "number of targets is %d.\n",
595 ISCSI_MAX_TARGET - 1);
596 goto release_host;
597 }
598 }
599 session->target_id = id;
600
601 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
602 session->sid);
603 err = device_add(&session->dev);
604 if (err) {
605 iscsi_cls_session_printk(KERN_ERR, session,
606 "could not register session's dev\n");
607 goto release_host;
608 }
609 transport_register_device(&session->dev);
610
611 spin_lock_irqsave(&sesslock, flags);
612 list_add(&session->sess_list, &sesslist);
613 spin_unlock_irqrestore(&sesslock, flags);
614
615 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
616 return 0;
617
618 release_host:
619 scsi_host_put(shost);
620 return err;
621 }
622 EXPORT_SYMBOL_GPL(iscsi_add_session);
623
624 /**
625 * iscsi_create_session - create iscsi class session
626 * @shost: scsi host
627 * @transport: iscsi transport
628 * @dd_size: private driver data size
629 * @target_id: which target
630 *
631 * This can be called from a LLD or iscsi_transport.
632 */
633 struct iscsi_cls_session *
634 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
635 int dd_size, unsigned int target_id)
636 {
637 struct iscsi_cls_session *session;
638
639 session = iscsi_alloc_session(shost, transport, dd_size);
640 if (!session)
641 return NULL;
642
643 if (iscsi_add_session(session, target_id)) {
644 iscsi_free_session(session);
645 return NULL;
646 }
647 return session;
648 }
649 EXPORT_SYMBOL_GPL(iscsi_create_session);
650
651 static void iscsi_conn_release(struct device *dev)
652 {
653 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
654 struct device *parent = conn->dev.parent;
655
656 kfree(conn);
657 put_device(parent);
658 }
659
660 static int iscsi_is_conn_dev(const struct device *dev)
661 {
662 return dev->release == iscsi_conn_release;
663 }
664
665 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
666 {
667 if (!iscsi_is_conn_dev(dev))
668 return 0;
669 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
670 }
671
672 void iscsi_remove_session(struct iscsi_cls_session *session)
673 {
674 struct Scsi_Host *shost = iscsi_session_to_shost(session);
675 struct iscsi_cls_host *ihost = shost->shost_data;
676 unsigned long flags;
677 int err;
678
679 spin_lock_irqsave(&sesslock, flags);
680 list_del(&session->sess_list);
681 spin_unlock_irqrestore(&sesslock, flags);
682
683 /* make sure there are no blocks/unblocks queued */
684 flush_workqueue(iscsi_eh_timer_workq);
685 /* make sure the timedout callout is not running */
686 if (!cancel_delayed_work(&session->recovery_work))
687 flush_workqueue(iscsi_eh_timer_workq);
688 /*
689 * If we are blocked let commands flow again. The lld or iscsi
690 * layer should set up the queuecommand to fail commands.
691 * We assume that LLD will not be calling block/unblock while
692 * removing the session.
693 */
694 spin_lock_irqsave(&session->lock, flags);
695 session->state = ISCSI_SESSION_FREE;
696 spin_unlock_irqrestore(&session->lock, flags);
697
698 scsi_target_unblock(&session->dev);
699 /* flush running scans then delete devices */
700 flush_workqueue(ihost->scan_workq);
701 __iscsi_unbind_session(&session->unbind_work);
702
703 /* hw iscsi may not have removed all connections from session */
704 err = device_for_each_child(&session->dev, NULL,
705 iscsi_iter_destroy_conn_fn);
706 if (err)
707 iscsi_cls_session_printk(KERN_ERR, session,
708 "Could not delete all connections "
709 "for session. Error %d.\n", err);
710
711 transport_unregister_device(&session->dev);
712 device_del(&session->dev);
713 }
714 EXPORT_SYMBOL_GPL(iscsi_remove_session);
715
716 void iscsi_free_session(struct iscsi_cls_session *session)
717 {
718 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
719 put_device(&session->dev);
720 }
721 EXPORT_SYMBOL_GPL(iscsi_free_session);
722
723 /**
724 * iscsi_destroy_session - destroy iscsi session
725 * @session: iscsi_session
726 *
727 * Can be called by a LLD or iscsi_transport. There must not be
728 * any running connections.
729 */
730 int iscsi_destroy_session(struct iscsi_cls_session *session)
731 {
732 iscsi_remove_session(session);
733 iscsi_free_session(session);
734 return 0;
735 }
736 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
737
738 /**
739 * iscsi_create_conn - create iscsi class connection
740 * @session: iscsi cls session
741 * @dd_size: private driver data size
742 * @cid: connection id
743 *
744 * This can be called from a LLD or iscsi_transport. The connection
745 * is child of the session so cid must be unique for all connections
746 * on the session.
747 *
748 * Since we do not support MCS, cid will normally be zero. In some cases
749 * for software iscsi we could be trying to preallocate a connection struct
750 * in which case there could be two connection structs and cid would be
751 * non-zero.
752 */
753 struct iscsi_cls_conn *
754 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
755 {
756 struct iscsi_transport *transport = session->transport;
757 struct iscsi_cls_conn *conn;
758 unsigned long flags;
759 int err;
760
761 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
762 if (!conn)
763 return NULL;
764 if (dd_size)
765 conn->dd_data = &conn[1];
766
767 INIT_LIST_HEAD(&conn->conn_list);
768 conn->transport = transport;
769 conn->cid = cid;
770
771 /* this is released in the dev's release function */
772 if (!get_device(&session->dev))
773 goto free_conn;
774
775 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
776 session->sid, cid);
777 conn->dev.parent = &session->dev;
778 conn->dev.release = iscsi_conn_release;
779 err = device_register(&conn->dev);
780 if (err) {
781 iscsi_cls_session_printk(KERN_ERR, session, "could not "
782 "register connection's dev\n");
783 goto release_parent_ref;
784 }
785 transport_register_device(&conn->dev);
786
787 spin_lock_irqsave(&connlock, flags);
788 list_add(&conn->conn_list, &connlist);
789 conn->active = 1;
790 spin_unlock_irqrestore(&connlock, flags);
791 return conn;
792
793 release_parent_ref:
794 put_device(&session->dev);
795 free_conn:
796 kfree(conn);
797 return NULL;
798 }
799
800 EXPORT_SYMBOL_GPL(iscsi_create_conn);
801
802 /**
803 * iscsi_destroy_conn - destroy iscsi class connection
804 * @conn: iscsi cls session
805 *
806 * This can be called from a LLD or iscsi_transport.
807 */
808 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
809 {
810 unsigned long flags;
811
812 spin_lock_irqsave(&connlock, flags);
813 conn->active = 0;
814 list_del(&conn->conn_list);
815 spin_unlock_irqrestore(&connlock, flags);
816
817 transport_unregister_device(&conn->dev);
818 device_unregister(&conn->dev);
819 return 0;
820 }
821 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
822
823 /*
824 * iscsi interface functions
825 */
826 static struct iscsi_internal *
827 iscsi_if_transport_lookup(struct iscsi_transport *tt)
828 {
829 struct iscsi_internal *priv;
830 unsigned long flags;
831
832 spin_lock_irqsave(&iscsi_transport_lock, flags);
833 list_for_each_entry(priv, &iscsi_transports, list) {
834 if (tt == priv->iscsi_transport) {
835 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
836 return priv;
837 }
838 }
839 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
840 return NULL;
841 }
842
843 static int
844 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
845 {
846 int rc;
847
848 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
849 if (rc < 0) {
850 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
851 return rc;
852 }
853
854 return 0;
855 }
856
857 static int
858 iscsi_unicast_skb(struct sk_buff *skb, int pid)
859 {
860 int rc;
861
862 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
863 if (rc < 0) {
864 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
865 return rc;
866 }
867
868 return 0;
869 }
870
871 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
872 char *data, uint32_t data_size)
873 {
874 struct nlmsghdr *nlh;
875 struct sk_buff *skb;
876 struct iscsi_uevent *ev;
877 char *pdu;
878 struct iscsi_internal *priv;
879 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
880 data_size);
881
882 priv = iscsi_if_transport_lookup(conn->transport);
883 if (!priv)
884 return -EINVAL;
885
886 skb = alloc_skb(len, GFP_ATOMIC);
887 if (!skb) {
888 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
889 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
890 "control PDU: OOM\n");
891 return -ENOMEM;
892 }
893
894 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
895 ev = NLMSG_DATA(nlh);
896 memset(ev, 0, sizeof(*ev));
897 ev->transport_handle = iscsi_handle(conn->transport);
898 ev->type = ISCSI_KEVENT_RECV_PDU;
899 ev->r.recv_req.cid = conn->cid;
900 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
901 pdu = (char*)ev + sizeof(*ev);
902 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
903 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
904
905 return iscsi_unicast_skb(skb, priv->daemon_pid);
906 }
907 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
908
909 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
910 {
911 struct nlmsghdr *nlh;
912 struct sk_buff *skb;
913 struct iscsi_uevent *ev;
914 struct iscsi_internal *priv;
915 int len = NLMSG_SPACE(sizeof(*ev));
916
917 priv = iscsi_if_transport_lookup(conn->transport);
918 if (!priv)
919 return;
920
921 skb = alloc_skb(len, GFP_ATOMIC);
922 if (!skb) {
923 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
924 "conn error (%d)\n", error);
925 return;
926 }
927
928 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
929 ev = NLMSG_DATA(nlh);
930 ev->transport_handle = iscsi_handle(conn->transport);
931 ev->type = ISCSI_KEVENT_CONN_ERROR;
932 ev->r.connerror.error = error;
933 ev->r.connerror.cid = conn->cid;
934 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
935
936 iscsi_broadcast_skb(skb, GFP_ATOMIC);
937
938 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
939 error);
940 }
941 EXPORT_SYMBOL_GPL(iscsi_conn_error);
942
943 static int
944 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
945 void *payload, int size)
946 {
947 struct sk_buff *skb;
948 struct nlmsghdr *nlh;
949 int len = NLMSG_SPACE(size);
950 int flags = multi ? NLM_F_MULTI : 0;
951 int t = done ? NLMSG_DONE : type;
952
953 skb = alloc_skb(len, GFP_ATOMIC);
954 if (!skb) {
955 printk(KERN_ERR "Could not allocate skb to send reply.\n");
956 return -ENOMEM;
957 }
958
959 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
960 nlh->nlmsg_flags = flags;
961 memcpy(NLMSG_DATA(nlh), payload, size);
962 return iscsi_unicast_skb(skb, pid);
963 }
964
965 static int
966 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
967 {
968 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
969 struct iscsi_stats *stats;
970 struct sk_buff *skbstat;
971 struct iscsi_cls_conn *conn;
972 struct nlmsghdr *nlhstat;
973 struct iscsi_uevent *evstat;
974 struct iscsi_internal *priv;
975 int len = NLMSG_SPACE(sizeof(*ev) +
976 sizeof(struct iscsi_stats) +
977 sizeof(struct iscsi_stats_custom) *
978 ISCSI_STATS_CUSTOM_MAX);
979 int err = 0;
980
981 priv = iscsi_if_transport_lookup(transport);
982 if (!priv)
983 return -EINVAL;
984
985 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
986 if (!conn)
987 return -EEXIST;
988
989 do {
990 int actual_size;
991
992 skbstat = alloc_skb(len, GFP_ATOMIC);
993 if (!skbstat) {
994 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
995 "deliver stats: OOM\n");
996 return -ENOMEM;
997 }
998
999 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
1000 (len - sizeof(*nlhstat)), 0);
1001 evstat = NLMSG_DATA(nlhstat);
1002 memset(evstat, 0, sizeof(*evstat));
1003 evstat->transport_handle = iscsi_handle(conn->transport);
1004 evstat->type = nlh->nlmsg_type;
1005 evstat->u.get_stats.cid =
1006 ev->u.get_stats.cid;
1007 evstat->u.get_stats.sid =
1008 ev->u.get_stats.sid;
1009 stats = (struct iscsi_stats *)
1010 ((char*)evstat + sizeof(*evstat));
1011 memset(stats, 0, sizeof(*stats));
1012
1013 transport->get_stats(conn, stats);
1014 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1015 sizeof(struct iscsi_stats) +
1016 sizeof(struct iscsi_stats_custom) *
1017 stats->custom_length);
1018 actual_size -= sizeof(*nlhstat);
1019 actual_size = NLMSG_LENGTH(actual_size);
1020 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1021 nlhstat->nlmsg_len = actual_size;
1022
1023 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
1024 } while (err < 0 && err != -ECONNREFUSED);
1025
1026 return err;
1027 }
1028
1029 /**
1030 * iscsi_session_event - send session destr. completion event
1031 * @session: iscsi class session
1032 * @event: type of event
1033 */
1034 int iscsi_session_event(struct iscsi_cls_session *session,
1035 enum iscsi_uevent_e event)
1036 {
1037 struct iscsi_internal *priv;
1038 struct Scsi_Host *shost;
1039 struct iscsi_uevent *ev;
1040 struct sk_buff *skb;
1041 struct nlmsghdr *nlh;
1042 int rc, len = NLMSG_SPACE(sizeof(*ev));
1043
1044 priv = iscsi_if_transport_lookup(session->transport);
1045 if (!priv)
1046 return -EINVAL;
1047 shost = iscsi_session_to_shost(session);
1048
1049 skb = alloc_skb(len, GFP_KERNEL);
1050 if (!skb) {
1051 iscsi_cls_session_printk(KERN_ERR, session,
1052 "Cannot notify userspace of session "
1053 "event %u\n", event);
1054 return -ENOMEM;
1055 }
1056
1057 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1058 ev = NLMSG_DATA(nlh);
1059 ev->transport_handle = iscsi_handle(session->transport);
1060
1061 ev->type = event;
1062 switch (event) {
1063 case ISCSI_KEVENT_DESTROY_SESSION:
1064 ev->r.d_session.host_no = shost->host_no;
1065 ev->r.d_session.sid = session->sid;
1066 break;
1067 case ISCSI_KEVENT_CREATE_SESSION:
1068 ev->r.c_session_ret.host_no = shost->host_no;
1069 ev->r.c_session_ret.sid = session->sid;
1070 break;
1071 case ISCSI_KEVENT_UNBIND_SESSION:
1072 ev->r.unbind_session.host_no = shost->host_no;
1073 ev->r.unbind_session.sid = session->sid;
1074 break;
1075 default:
1076 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1077 "%u.\n", event);
1078 kfree_skb(skb);
1079 return -EINVAL;
1080 }
1081
1082 /*
1083 * this will occur if the daemon is not up, so we just warn
1084 * the user and when the daemon is restarted it will handle it
1085 */
1086 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1087 if (rc < 0)
1088 iscsi_cls_session_printk(KERN_ERR, session,
1089 "Cannot notify userspace of session "
1090 "event %u. Check iscsi daemon\n",
1091 event);
1092 return rc;
1093 }
1094 EXPORT_SYMBOL_GPL(iscsi_session_event);
1095
1096 static int
1097 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev,
1098 uint32_t host_no, uint32_t initial_cmdsn,
1099 uint16_t cmds_max, uint16_t queue_depth)
1100 {
1101 struct iscsi_transport *transport = priv->iscsi_transport;
1102 struct iscsi_cls_session *session;
1103 struct Scsi_Host *shost = NULL;
1104
1105 /*
1106 * Software iscsi allocates a host per session, but
1107 * offload drivers (and possibly iser one day) allocate a host per
1108 * hba/nic/rnic. Offload will match a host here, but software will
1109 * return a new hostno after the create_session callback has returned.
1110 */
1111 if (host_no != UINT_MAX) {
1112 shost = scsi_host_lookup(host_no);
1113 if (IS_ERR(shost)) {
1114 printk(KERN_ERR "Could not find host no %u to "
1115 "create session\n", host_no);
1116 return -ENODEV;
1117 }
1118 }
1119
1120 session = transport->create_session(shost, cmds_max, queue_depth,
1121 initial_cmdsn, &host_no);
1122 if (shost)
1123 scsi_host_put(shost);
1124 if (!session)
1125 return -ENOMEM;
1126
1127 ev->r.c_session_ret.host_no = host_no;
1128 ev->r.c_session_ret.sid = session->sid;
1129 return 0;
1130 }
1131
1132 static int
1133 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1134 {
1135 struct iscsi_cls_conn *conn;
1136 struct iscsi_cls_session *session;
1137
1138 session = iscsi_session_lookup(ev->u.c_conn.sid);
1139 if (!session) {
1140 printk(KERN_ERR "iscsi: invalid session %d.\n",
1141 ev->u.c_conn.sid);
1142 return -EINVAL;
1143 }
1144
1145 conn = transport->create_conn(session, ev->u.c_conn.cid);
1146 if (!conn) {
1147 iscsi_cls_session_printk(KERN_ERR, session,
1148 "couldn't create a new connection.");
1149 return -ENOMEM;
1150 }
1151
1152 ev->r.c_conn_ret.sid = session->sid;
1153 ev->r.c_conn_ret.cid = conn->cid;
1154 return 0;
1155 }
1156
1157 static int
1158 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1159 {
1160 struct iscsi_cls_conn *conn;
1161
1162 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1163 if (!conn)
1164 return -EINVAL;
1165
1166 if (transport->destroy_conn)
1167 transport->destroy_conn(conn);
1168 return 0;
1169 }
1170
1171 static int
1172 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1173 {
1174 char *data = (char*)ev + sizeof(*ev);
1175 struct iscsi_cls_conn *conn;
1176 struct iscsi_cls_session *session;
1177 int err = 0, value = 0;
1178
1179 session = iscsi_session_lookup(ev->u.set_param.sid);
1180 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1181 if (!conn || !session)
1182 return -EINVAL;
1183
1184 switch (ev->u.set_param.param) {
1185 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1186 sscanf(data, "%d", &value);
1187 if (value != 0)
1188 session->recovery_tmo = value;
1189 break;
1190 default:
1191 err = transport->set_param(conn, ev->u.set_param.param,
1192 data, ev->u.set_param.len);
1193 }
1194
1195 return err;
1196 }
1197
1198 static int
1199 iscsi_if_transport_ep(struct iscsi_transport *transport,
1200 struct iscsi_uevent *ev, int msg_type)
1201 {
1202 struct sockaddr *dst_addr;
1203 int rc = 0;
1204
1205 switch (msg_type) {
1206 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1207 if (!transport->ep_connect)
1208 return -EINVAL;
1209
1210 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1211 rc = transport->ep_connect(dst_addr,
1212 ev->u.ep_connect.non_blocking,
1213 &ev->r.ep_connect_ret.handle);
1214 break;
1215 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1216 if (!transport->ep_poll)
1217 return -EINVAL;
1218
1219 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
1220 ev->u.ep_poll.timeout_ms);
1221 break;
1222 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1223 if (!transport->ep_disconnect)
1224 return -EINVAL;
1225
1226 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
1227 break;
1228 }
1229 return rc;
1230 }
1231
1232 static int
1233 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1234 struct iscsi_uevent *ev)
1235 {
1236 struct Scsi_Host *shost;
1237 struct sockaddr *dst_addr;
1238 int err;
1239
1240 if (!transport->tgt_dscvr)
1241 return -EINVAL;
1242
1243 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1244 if (IS_ERR(shost)) {
1245 printk(KERN_ERR "target discovery could not find host no %u\n",
1246 ev->u.tgt_dscvr.host_no);
1247 return -ENODEV;
1248 }
1249
1250
1251 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1252 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1253 ev->u.tgt_dscvr.enable, dst_addr);
1254 scsi_host_put(shost);
1255 return err;
1256 }
1257
1258 static int
1259 iscsi_set_host_param(struct iscsi_transport *transport,
1260 struct iscsi_uevent *ev)
1261 {
1262 char *data = (char*)ev + sizeof(*ev);
1263 struct Scsi_Host *shost;
1264 int err;
1265
1266 if (!transport->set_host_param)
1267 return -ENOSYS;
1268
1269 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1270 if (IS_ERR(shost)) {
1271 printk(KERN_ERR "set_host_param could not find host no %u\n",
1272 ev->u.set_host_param.host_no);
1273 return -ENODEV;
1274 }
1275
1276 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1277 data, ev->u.set_host_param.len);
1278 scsi_host_put(shost);
1279 return err;
1280 }
1281
1282 static int
1283 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1284 {
1285 int err = 0;
1286 uint32_t host_no = UINT_MAX;
1287 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1288 struct iscsi_transport *transport = NULL;
1289 struct iscsi_internal *priv;
1290 struct iscsi_cls_session *session;
1291 struct iscsi_cls_conn *conn;
1292
1293 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1294 if (!priv)
1295 return -EINVAL;
1296 transport = priv->iscsi_transport;
1297
1298 if (!try_module_get(transport->owner))
1299 return -EINVAL;
1300
1301 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1302
1303 switch (nlh->nlmsg_type) {
1304 case ISCSI_UEVENT_CREATE_SESSION:
1305 err = iscsi_if_create_session(priv, ev, host_no,
1306 ev->u.c_session.initial_cmdsn,
1307 ev->u.c_session.cmds_max,
1308 ev->u.c_session.queue_depth);
1309 break;
1310 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1311 err = iscsi_if_create_session(priv, ev,
1312 ev->u.c_bound_session.host_no,
1313 ev->u.c_bound_session.initial_cmdsn,
1314 ev->u.c_bound_session.cmds_max,
1315 ev->u.c_bound_session.queue_depth);
1316 break;
1317 case ISCSI_UEVENT_DESTROY_SESSION:
1318 session = iscsi_session_lookup(ev->u.d_session.sid);
1319 if (session)
1320 transport->destroy_session(session);
1321 else
1322 err = -EINVAL;
1323 break;
1324 case ISCSI_UEVENT_UNBIND_SESSION:
1325 session = iscsi_session_lookup(ev->u.d_session.sid);
1326 if (session)
1327 iscsi_unbind_session(session);
1328 else
1329 err = -EINVAL;
1330 break;
1331 case ISCSI_UEVENT_CREATE_CONN:
1332 err = iscsi_if_create_conn(transport, ev);
1333 break;
1334 case ISCSI_UEVENT_DESTROY_CONN:
1335 err = iscsi_if_destroy_conn(transport, ev);
1336 break;
1337 case ISCSI_UEVENT_BIND_CONN:
1338 session = iscsi_session_lookup(ev->u.b_conn.sid);
1339 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1340
1341 if (session && conn)
1342 ev->r.retcode = transport->bind_conn(session, conn,
1343 ev->u.b_conn.transport_eph,
1344 ev->u.b_conn.is_leading);
1345 else
1346 err = -EINVAL;
1347 break;
1348 case ISCSI_UEVENT_SET_PARAM:
1349 err = iscsi_set_param(transport, ev);
1350 break;
1351 case ISCSI_UEVENT_START_CONN:
1352 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1353 if (conn)
1354 ev->r.retcode = transport->start_conn(conn);
1355 else
1356 err = -EINVAL;
1357 break;
1358 case ISCSI_UEVENT_STOP_CONN:
1359 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1360 if (conn)
1361 transport->stop_conn(conn, ev->u.stop_conn.flag);
1362 else
1363 err = -EINVAL;
1364 break;
1365 case ISCSI_UEVENT_SEND_PDU:
1366 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1367 if (conn)
1368 ev->r.retcode = transport->send_pdu(conn,
1369 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1370 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1371 ev->u.send_pdu.data_size);
1372 else
1373 err = -EINVAL;
1374 break;
1375 case ISCSI_UEVENT_GET_STATS:
1376 err = iscsi_if_get_stats(transport, nlh);
1377 break;
1378 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1379 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1380 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1381 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1382 break;
1383 case ISCSI_UEVENT_TGT_DSCVR:
1384 err = iscsi_tgt_dscvr(transport, ev);
1385 break;
1386 case ISCSI_UEVENT_SET_HOST_PARAM:
1387 err = iscsi_set_host_param(transport, ev);
1388 break;
1389 default:
1390 err = -ENOSYS;
1391 break;
1392 }
1393
1394 module_put(transport->owner);
1395 return err;
1396 }
1397
1398 /*
1399 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1400 * Malformed skbs with wrong lengths or invalid creds are not processed.
1401 */
1402 static void
1403 iscsi_if_rx(struct sk_buff *skb)
1404 {
1405 mutex_lock(&rx_queue_mutex);
1406 while (skb->len >= NLMSG_SPACE(0)) {
1407 int err;
1408 uint32_t rlen;
1409 struct nlmsghdr *nlh;
1410 struct iscsi_uevent *ev;
1411
1412 nlh = nlmsg_hdr(skb);
1413 if (nlh->nlmsg_len < sizeof(*nlh) ||
1414 skb->len < nlh->nlmsg_len) {
1415 break;
1416 }
1417
1418 ev = NLMSG_DATA(nlh);
1419 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1420 if (rlen > skb->len)
1421 rlen = skb->len;
1422
1423 err = iscsi_if_recv_msg(skb, nlh);
1424 if (err) {
1425 ev->type = ISCSI_KEVENT_IF_ERROR;
1426 ev->iferror = err;
1427 }
1428 do {
1429 /*
1430 * special case for GET_STATS:
1431 * on success - sending reply and stats from
1432 * inside of if_recv_msg(),
1433 * on error - fall through.
1434 */
1435 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1436 break;
1437 err = iscsi_if_send_reply(
1438 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1439 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1440 } while (err < 0 && err != -ECONNREFUSED);
1441 skb_pull(skb, rlen);
1442 }
1443 mutex_unlock(&rx_queue_mutex);
1444 }
1445
1446 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1447 struct device_attribute dev_attr_##_prefix##_##_name = \
1448 __ATTR(_name,_mode,_show,_store)
1449
1450 /*
1451 * iSCSI connection attrs
1452 */
1453 #define iscsi_conn_attr_show(param) \
1454 static ssize_t \
1455 show_conn_param_##param(struct device *dev, \
1456 struct device_attribute *attr, char *buf) \
1457 { \
1458 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1459 struct iscsi_transport *t = conn->transport; \
1460 return t->get_conn_param(conn, param, buf); \
1461 }
1462
1463 #define iscsi_conn_attr(field, param) \
1464 iscsi_conn_attr_show(param) \
1465 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1466 NULL);
1467
1468 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1469 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1470 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1471 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1472 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1473 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1474 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1475 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1476 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1477 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1478 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1479 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1480 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1481
1482 /*
1483 * iSCSI session attrs
1484 */
1485 #define iscsi_session_attr_show(param, perm) \
1486 static ssize_t \
1487 show_session_param_##param(struct device *dev, \
1488 struct device_attribute *attr, char *buf) \
1489 { \
1490 struct iscsi_cls_session *session = \
1491 iscsi_dev_to_session(dev->parent); \
1492 struct iscsi_transport *t = session->transport; \
1493 \
1494 if (perm && !capable(CAP_SYS_ADMIN)) \
1495 return -EACCES; \
1496 return t->get_session_param(session, param, buf); \
1497 }
1498
1499 #define iscsi_session_attr(field, param, perm) \
1500 iscsi_session_attr_show(param, perm) \
1501 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1502 NULL);
1503
1504 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1505 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1506 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1507 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1508 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1509 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1510 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1511 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1512 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1513 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1514 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1515 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1516 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1517 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1518 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1519 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1520 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1521
1522 static ssize_t
1523 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1524 char *buf)
1525 {
1526 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1527 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1528 }
1529 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1530 NULL);
1531
1532 #define iscsi_priv_session_attr_show(field, format) \
1533 static ssize_t \
1534 show_priv_session_##field(struct device *dev, \
1535 struct device_attribute *attr, char *buf) \
1536 { \
1537 struct iscsi_cls_session *session = \
1538 iscsi_dev_to_session(dev->parent); \
1539 return sprintf(buf, format"\n", session->field); \
1540 }
1541
1542 #define iscsi_priv_session_attr(field, format) \
1543 iscsi_priv_session_attr_show(field, format) \
1544 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1545 NULL)
1546 iscsi_priv_session_attr(recovery_tmo, "%d");
1547
1548 /*
1549 * iSCSI host attrs
1550 */
1551 #define iscsi_host_attr_show(param) \
1552 static ssize_t \
1553 show_host_param_##param(struct device *dev, \
1554 struct device_attribute *attr, char *buf) \
1555 { \
1556 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1557 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1558 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1559 }
1560
1561 #define iscsi_host_attr(field, param) \
1562 iscsi_host_attr_show(param) \
1563 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1564 NULL);
1565
1566 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1567 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1568 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1569 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1570
1571 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1572 do { \
1573 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1574 count++; \
1575 } while (0)
1576
1577
1578 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1579 do { \
1580 if (tt->param_mask & param_flag) { \
1581 priv->session_attrs[count] = &dev_attr_sess_##field; \
1582 count++; \
1583 } \
1584 } while (0)
1585
1586 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1587 do { \
1588 if (tt->param_mask & param_flag) { \
1589 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1590 count++; \
1591 } \
1592 } while (0)
1593
1594 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1595 do { \
1596 if (tt->host_param_mask & param_flag) { \
1597 priv->host_attrs[count] = &dev_attr_host_##field; \
1598 count++; \
1599 } \
1600 } while (0)
1601
1602 static int iscsi_session_match(struct attribute_container *cont,
1603 struct device *dev)
1604 {
1605 struct iscsi_cls_session *session;
1606 struct Scsi_Host *shost;
1607 struct iscsi_internal *priv;
1608
1609 if (!iscsi_is_session_dev(dev))
1610 return 0;
1611
1612 session = iscsi_dev_to_session(dev);
1613 shost = iscsi_session_to_shost(session);
1614 if (!shost->transportt)
1615 return 0;
1616
1617 priv = to_iscsi_internal(shost->transportt);
1618 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1619 return 0;
1620
1621 return &priv->session_cont.ac == cont;
1622 }
1623
1624 static int iscsi_conn_match(struct attribute_container *cont,
1625 struct device *dev)
1626 {
1627 struct iscsi_cls_session *session;
1628 struct iscsi_cls_conn *conn;
1629 struct Scsi_Host *shost;
1630 struct iscsi_internal *priv;
1631
1632 if (!iscsi_is_conn_dev(dev))
1633 return 0;
1634
1635 conn = iscsi_dev_to_conn(dev);
1636 session = iscsi_dev_to_session(conn->dev.parent);
1637 shost = iscsi_session_to_shost(session);
1638
1639 if (!shost->transportt)
1640 return 0;
1641
1642 priv = to_iscsi_internal(shost->transportt);
1643 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1644 return 0;
1645
1646 return &priv->conn_cont.ac == cont;
1647 }
1648
1649 static int iscsi_host_match(struct attribute_container *cont,
1650 struct device *dev)
1651 {
1652 struct Scsi_Host *shost;
1653 struct iscsi_internal *priv;
1654
1655 if (!scsi_is_host_device(dev))
1656 return 0;
1657
1658 shost = dev_to_shost(dev);
1659 if (!shost->transportt ||
1660 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1661 return 0;
1662
1663 priv = to_iscsi_internal(shost->transportt);
1664 return &priv->t.host_attrs.ac == cont;
1665 }
1666
1667 struct scsi_transport_template *
1668 iscsi_register_transport(struct iscsi_transport *tt)
1669 {
1670 struct iscsi_internal *priv;
1671 unsigned long flags;
1672 int count = 0, err;
1673
1674 BUG_ON(!tt);
1675
1676 priv = iscsi_if_transport_lookup(tt);
1677 if (priv)
1678 return NULL;
1679
1680 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1681 if (!priv)
1682 return NULL;
1683 INIT_LIST_HEAD(&priv->list);
1684 priv->daemon_pid = -1;
1685 priv->iscsi_transport = tt;
1686 priv->t.user_scan = iscsi_user_scan;
1687 if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
1688 priv->t.create_work_queue = 1;
1689
1690 priv->dev.class = &iscsi_transport_class;
1691 snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name);
1692 err = device_register(&priv->dev);
1693 if (err)
1694 goto free_priv;
1695
1696 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1697 if (err)
1698 goto unregister_dev;
1699
1700 /* host parameters */
1701 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1702 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1703 priv->t.host_attrs.ac.match = iscsi_host_match;
1704 priv->t.host_size = sizeof(struct iscsi_cls_host);
1705 transport_container_register(&priv->t.host_attrs);
1706
1707 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1708 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1709 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1710 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1711 BUG_ON(count > ISCSI_HOST_ATTRS);
1712 priv->host_attrs[count] = NULL;
1713 count = 0;
1714
1715 /* connection parameters */
1716 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1717 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1718 priv->conn_cont.ac.match = iscsi_conn_match;
1719 transport_container_register(&priv->conn_cont);
1720
1721 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1722 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1723 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1724 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1725 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1726 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1727 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1728 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1729 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1730 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1731 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1732 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1733 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1734
1735 BUG_ON(count > ISCSI_CONN_ATTRS);
1736 priv->conn_attrs[count] = NULL;
1737 count = 0;
1738
1739 /* session parameters */
1740 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1741 priv->session_cont.ac.class = &iscsi_session_class.class;
1742 priv->session_cont.ac.match = iscsi_session_match;
1743 transport_container_register(&priv->session_cont);
1744
1745 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1746 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1747 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1748 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1749 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1750 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1751 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1752 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1753 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1754 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1755 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1756 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1757 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1758 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1759 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1760 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1761 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1762 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1763 SETUP_PRIV_SESSION_RD_ATTR(state);
1764
1765 BUG_ON(count > ISCSI_SESSION_ATTRS);
1766 priv->session_attrs[count] = NULL;
1767
1768 spin_lock_irqsave(&iscsi_transport_lock, flags);
1769 list_add(&priv->list, &iscsi_transports);
1770 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1771
1772 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1773 return &priv->t;
1774
1775 unregister_dev:
1776 device_unregister(&priv->dev);
1777 free_priv:
1778 kfree(priv);
1779 return NULL;
1780 }
1781 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1782
1783 int iscsi_unregister_transport(struct iscsi_transport *tt)
1784 {
1785 struct iscsi_internal *priv;
1786 unsigned long flags;
1787
1788 BUG_ON(!tt);
1789
1790 mutex_lock(&rx_queue_mutex);
1791
1792 priv = iscsi_if_transport_lookup(tt);
1793 BUG_ON (!priv);
1794
1795 spin_lock_irqsave(&iscsi_transport_lock, flags);
1796 list_del(&priv->list);
1797 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1798
1799 transport_container_unregister(&priv->conn_cont);
1800 transport_container_unregister(&priv->session_cont);
1801 transport_container_unregister(&priv->t.host_attrs);
1802
1803 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1804 device_unregister(&priv->dev);
1805 mutex_unlock(&rx_queue_mutex);
1806
1807 return 0;
1808 }
1809 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1810
1811 static __init int iscsi_transport_init(void)
1812 {
1813 int err;
1814
1815 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1816 ISCSI_TRANSPORT_VERSION);
1817
1818 atomic_set(&iscsi_session_nr, 0);
1819
1820 err = class_register(&iscsi_transport_class);
1821 if (err)
1822 return err;
1823
1824 err = transport_class_register(&iscsi_host_class);
1825 if (err)
1826 goto unregister_transport_class;
1827
1828 err = transport_class_register(&iscsi_connection_class);
1829 if (err)
1830 goto unregister_host_class;
1831
1832 err = transport_class_register(&iscsi_session_class);
1833 if (err)
1834 goto unregister_conn_class;
1835
1836 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
1837 THIS_MODULE);
1838 if (!nls) {
1839 err = -ENOBUFS;
1840 goto unregister_session_class;
1841 }
1842
1843 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1844 if (!iscsi_eh_timer_workq)
1845 goto release_nls;
1846
1847 return 0;
1848
1849 release_nls:
1850 netlink_kernel_release(nls);
1851 unregister_session_class:
1852 transport_class_unregister(&iscsi_session_class);
1853 unregister_conn_class:
1854 transport_class_unregister(&iscsi_connection_class);
1855 unregister_host_class:
1856 transport_class_unregister(&iscsi_host_class);
1857 unregister_transport_class:
1858 class_unregister(&iscsi_transport_class);
1859 return err;
1860 }
1861
1862 static void __exit iscsi_transport_exit(void)
1863 {
1864 destroy_workqueue(iscsi_eh_timer_workq);
1865 netlink_kernel_release(nls);
1866 transport_class_unregister(&iscsi_connection_class);
1867 transport_class_unregister(&iscsi_session_class);
1868 transport_class_unregister(&iscsi_host_class);
1869 class_unregister(&iscsi_transport_class);
1870 }
1871
1872 module_init(iscsi_transport_init);
1873 module_exit(iscsi_transport_exit);
1874
1875 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1876 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1877 "Alex Aizman <itn780@yahoo.com>");
1878 MODULE_DESCRIPTION("iSCSI Transport Interface");
1879 MODULE_LICENSE("GPL");
1880 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
x86 "subsystem" repository