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regulator: twl4030 regulators
[linux-2.6/linux-loongson.git] / drivers / scsi / scsi_transport_iscsi.c
blob094795455293eb93e3bd4b0fa275544d12ee322d
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 21
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
36
37 #define ISCSI_TRANSPORT_VERSION "2.0-870"
38
39 struct iscsi_internal {
40 int daemon_pid;
41 struct scsi_transport_template t;
42 struct iscsi_transport *iscsi_transport;
43 struct list_head list;
44 struct device dev;
45
46 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
47 struct transport_container conn_cont;
48 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
49 struct transport_container session_cont;
50 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
51 };
52
53 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
54 static struct workqueue_struct *iscsi_eh_timer_workq;
55
56 /*
57 * list of registered transports and lock that must
58 * be held while accessing list. The iscsi_transport_lock must
59 * be acquired after the rx_queue_mutex.
60 */
61 static LIST_HEAD(iscsi_transports);
62 static DEFINE_SPINLOCK(iscsi_transport_lock);
63
64 #define to_iscsi_internal(tmpl) \
65 container_of(tmpl, struct iscsi_internal, t)
66
67 #define dev_to_iscsi_internal(_dev) \
68 container_of(_dev, struct iscsi_internal, dev)
69
70 static void iscsi_transport_release(struct device *dev)
71 {
72 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
73 kfree(priv);
74 }
75
76 /*
77 * iscsi_transport_class represents the iscsi_transports that are
78 * registered.
79 */
80 static struct class iscsi_transport_class = {
81 .name = "iscsi_transport",
82 .dev_release = iscsi_transport_release,
83 };
84
85 static ssize_t
86 show_transport_handle(struct device *dev, struct device_attribute *attr,
87 char *buf)
88 {
89 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
90 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
91 }
92 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
93
94 #define show_transport_attr(name, format) \
95 static ssize_t \
96 show_transport_##name(struct device *dev, \
97 struct device_attribute *attr,char *buf) \
98 { \
99 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
100 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
101 } \
102 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
103
104 show_transport_attr(caps, "0x%x");
105
106 static struct attribute *iscsi_transport_attrs[] = {
107 &dev_attr_handle.attr,
108 &dev_attr_caps.attr,
109 NULL,
110 };
111
112 static struct attribute_group iscsi_transport_group = {
113 .attrs = iscsi_transport_attrs,
114 };
115
116 /*
117 * iSCSI endpoint attrs
118 */
119 #define iscsi_dev_to_endpoint(_dev) \
120 container_of(_dev, struct iscsi_endpoint, dev)
121
122 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
123 struct device_attribute dev_attr_##_prefix##_##_name = \
124 __ATTR(_name,_mode,_show,_store)
125
126 static void iscsi_endpoint_release(struct device *dev)
127 {
128 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
129 kfree(ep);
130 }
131
132 static struct class iscsi_endpoint_class = {
133 .name = "iscsi_endpoint",
134 .dev_release = iscsi_endpoint_release,
135 };
136
137 static ssize_t
138 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
139 {
140 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
141 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
142 }
143 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
144
145 static struct attribute *iscsi_endpoint_attrs[] = {
146 &dev_attr_ep_handle.attr,
147 NULL,
148 };
149
150 static struct attribute_group iscsi_endpoint_group = {
151 .attrs = iscsi_endpoint_attrs,
152 };
153
154 #define ISCSI_MAX_EPID -1
155
156 static int iscsi_match_epid(struct device *dev, void *data)
157 {
158 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
159 uint64_t *epid = (uint64_t *) data;
160
161 return *epid == ep->id;
162 }
163
164 struct iscsi_endpoint *
165 iscsi_create_endpoint(int dd_size)
166 {
167 struct device *dev;
168 struct iscsi_endpoint *ep;
169 uint64_t id;
170 int err;
171
172 for (id = 1; id < ISCSI_MAX_EPID; id++) {
173 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
174 iscsi_match_epid);
175 if (!dev)
176 break;
177 }
178 if (id == ISCSI_MAX_EPID) {
179 printk(KERN_ERR "Too many connections. Max supported %u\n",
180 ISCSI_MAX_EPID - 1);
181 return NULL;
182 }
183
184 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
185 if (!ep)
186 return NULL;
187
188 ep->id = id;
189 ep->dev.class = &iscsi_endpoint_class;
190 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
191 err = device_register(&ep->dev);
192 if (err)
193 goto free_ep;
194
195 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
196 if (err)
197 goto unregister_dev;
198
199 if (dd_size)
200 ep->dd_data = &ep[1];
201 return ep;
202
203 unregister_dev:
204 device_unregister(&ep->dev);
205 return NULL;
206
207 free_ep:
208 kfree(ep);
209 return NULL;
210 }
211 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
212
213 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
214 {
215 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
216 device_unregister(&ep->dev);
217 }
218 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
219
220 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
221 {
222 struct iscsi_endpoint *ep;
223 struct device *dev;
224
225 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
226 iscsi_match_epid);
227 if (!dev)
228 return NULL;
229
230 ep = iscsi_dev_to_endpoint(dev);
231 /*
232 * we can drop this now because the interface will prevent
233 * removals and lookups from racing.
234 */
235 put_device(dev);
236 return ep;
237 }
238 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
239
240 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
241 struct device *cdev)
242 {
243 struct Scsi_Host *shost = dev_to_shost(dev);
244 struct iscsi_cls_host *ihost = shost->shost_data;
245
246 memset(ihost, 0, sizeof(*ihost));
247 atomic_set(&ihost->nr_scans, 0);
248 mutex_init(&ihost->mutex);
249 return 0;
250 }
251
252 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
253 "iscsi_host",
254 iscsi_setup_host,
255 NULL,
256 NULL);
257
258 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
259 "iscsi_session",
260 NULL,
261 NULL,
262 NULL);
263
264 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
265 "iscsi_connection",
266 NULL,
267 NULL,
268 NULL);
269
270 static struct sock *nls;
271 static DEFINE_MUTEX(rx_queue_mutex);
272
273 static LIST_HEAD(sesslist);
274 static DEFINE_SPINLOCK(sesslock);
275 static LIST_HEAD(connlist);
276 static DEFINE_SPINLOCK(connlock);
277
278 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
279 {
280 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
281 return sess->sid;
282 }
283
284 /*
285 * Returns the matching session to a given sid
286 */
287 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
288 {
289 unsigned long flags;
290 struct iscsi_cls_session *sess;
291
292 spin_lock_irqsave(&sesslock, flags);
293 list_for_each_entry(sess, &sesslist, sess_list) {
294 if (sess->sid == sid) {
295 spin_unlock_irqrestore(&sesslock, flags);
296 return sess;
297 }
298 }
299 spin_unlock_irqrestore(&sesslock, flags);
300 return NULL;
301 }
302
303 /*
304 * Returns the matching connection to a given sid / cid tuple
305 */
306 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
307 {
308 unsigned long flags;
309 struct iscsi_cls_conn *conn;
310
311 spin_lock_irqsave(&connlock, flags);
312 list_for_each_entry(conn, &connlist, conn_list) {
313 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
314 spin_unlock_irqrestore(&connlock, flags);
315 return conn;
316 }
317 }
318 spin_unlock_irqrestore(&connlock, flags);
319 return NULL;
320 }
321
322 /*
323 * The following functions can be used by LLDs that allocate
324 * their own scsi_hosts or by software iscsi LLDs
325 */
326 static struct {
327 int value;
328 char *name;
329 } iscsi_session_state_names[] = {
330 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
331 { ISCSI_SESSION_FAILED, "FAILED" },
332 { ISCSI_SESSION_FREE, "FREE" },
333 };
334
335 static const char *iscsi_session_state_name(int state)
336 {
337 int i;
338 char *name = NULL;
339
340 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
341 if (iscsi_session_state_names[i].value == state) {
342 name = iscsi_session_state_names[i].name;
343 break;
344 }
345 }
346 return name;
347 }
348
349 int iscsi_session_chkready(struct iscsi_cls_session *session)
350 {
351 unsigned long flags;
352 int err;
353
354 spin_lock_irqsave(&session->lock, flags);
355 switch (session->state) {
356 case ISCSI_SESSION_LOGGED_IN:
357 err = 0;
358 break;
359 case ISCSI_SESSION_FAILED:
360 err = DID_TRANSPORT_DISRUPTED << 16;
361 break;
362 case ISCSI_SESSION_FREE:
363 err = DID_TRANSPORT_FAILFAST << 16;
364 break;
365 default:
366 err = DID_NO_CONNECT << 16;
367 break;
368 }
369 spin_unlock_irqrestore(&session->lock, flags);
370 return err;
371 }
372 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
373
374 static void iscsi_session_release(struct device *dev)
375 {
376 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
377 struct Scsi_Host *shost;
378
379 shost = iscsi_session_to_shost(session);
380 scsi_host_put(shost);
381 kfree(session);
382 }
383
384 static int iscsi_is_session_dev(const struct device *dev)
385 {
386 return dev->release == iscsi_session_release;
387 }
388
389 static int iscsi_iter_session_fn(struct device *dev, void *data)
390 {
391 void (* fn) (struct iscsi_cls_session *) = data;
392
393 if (!iscsi_is_session_dev(dev))
394 return 0;
395 fn(iscsi_dev_to_session(dev));
396 return 0;
397 }
398
399 void iscsi_host_for_each_session(struct Scsi_Host *shost,
400 void (*fn)(struct iscsi_cls_session *))
401 {
402 device_for_each_child(&shost->shost_gendev, fn,
403 iscsi_iter_session_fn);
404 }
405 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
406
407 /**
408 * iscsi_scan_finished - helper to report when running scans are done
409 * @shost: scsi host
410 * @time: scan run time
411 *
412 * This function can be used by drives like qla4xxx to report to the scsi
413 * layer when the scans it kicked off at module load time are done.
414 */
415 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
416 {
417 struct iscsi_cls_host *ihost = shost->shost_data;
418 /*
419 * qla4xxx will have kicked off some session unblocks before calling
420 * scsi_scan_host, so just wait for them to complete.
421 */
422 return !atomic_read(&ihost->nr_scans);
423 }
424 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
425
426 struct iscsi_scan_data {
427 unsigned int channel;
428 unsigned int id;
429 unsigned int lun;
430 };
431
432 static int iscsi_user_scan_session(struct device *dev, void *data)
433 {
434 struct iscsi_scan_data *scan_data = data;
435 struct iscsi_cls_session *session;
436 struct Scsi_Host *shost;
437 struct iscsi_cls_host *ihost;
438 unsigned long flags;
439 unsigned int id;
440
441 if (!iscsi_is_session_dev(dev))
442 return 0;
443
444 session = iscsi_dev_to_session(dev);
445 shost = iscsi_session_to_shost(session);
446 ihost = shost->shost_data;
447
448 mutex_lock(&ihost->mutex);
449 spin_lock_irqsave(&session->lock, flags);
450 if (session->state != ISCSI_SESSION_LOGGED_IN) {
451 spin_unlock_irqrestore(&session->lock, flags);
452 mutex_unlock(&ihost->mutex);
453 return 0;
454 }
455 id = session->target_id;
456 spin_unlock_irqrestore(&session->lock, flags);
457
458 if (id != ISCSI_MAX_TARGET) {
459 if ((scan_data->channel == SCAN_WILD_CARD ||
460 scan_data->channel == 0) &&
461 (scan_data->id == SCAN_WILD_CARD ||
462 scan_data->id == id))
463 scsi_scan_target(&session->dev, 0, id,
464 scan_data->lun, 1);
465 }
466 mutex_unlock(&ihost->mutex);
467 return 0;
468 }
469
470 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
471 uint id, uint lun)
472 {
473 struct iscsi_scan_data scan_data;
474
475 scan_data.channel = channel;
476 scan_data.id = id;
477 scan_data.lun = lun;
478
479 return device_for_each_child(&shost->shost_gendev, &scan_data,
480 iscsi_user_scan_session);
481 }
482
483 static void iscsi_scan_session(struct work_struct *work)
484 {
485 struct iscsi_cls_session *session =
486 container_of(work, struct iscsi_cls_session, scan_work);
487 struct Scsi_Host *shost = iscsi_session_to_shost(session);
488 struct iscsi_cls_host *ihost = shost->shost_data;
489 struct iscsi_scan_data scan_data;
490
491 scan_data.channel = 0;
492 scan_data.id = SCAN_WILD_CARD;
493 scan_data.lun = SCAN_WILD_CARD;
494
495 iscsi_user_scan_session(&session->dev, &scan_data);
496 atomic_dec(&ihost->nr_scans);
497 }
498
499 static void session_recovery_timedout(struct work_struct *work)
500 {
501 struct iscsi_cls_session *session =
502 container_of(work, struct iscsi_cls_session,
503 recovery_work.work);
504 unsigned long flags;
505
506 iscsi_cls_session_printk(KERN_INFO, session,
507 "session recovery timed out after %d secs\n",
508 session->recovery_tmo);
509
510 spin_lock_irqsave(&session->lock, flags);
511 switch (session->state) {
512 case ISCSI_SESSION_FAILED:
513 session->state = ISCSI_SESSION_FREE;
514 break;
515 case ISCSI_SESSION_LOGGED_IN:
516 case ISCSI_SESSION_FREE:
517 /* we raced with the unblock's flush */
518 spin_unlock_irqrestore(&session->lock, flags);
519 return;
520 }
521 spin_unlock_irqrestore(&session->lock, flags);
522
523 if (session->transport->session_recovery_timedout)
524 session->transport->session_recovery_timedout(session);
525
526 scsi_target_unblock(&session->dev);
527 }
528
529 static void __iscsi_unblock_session(struct work_struct *work)
530 {
531 struct iscsi_cls_session *session =
532 container_of(work, struct iscsi_cls_session,
533 unblock_work);
534 struct Scsi_Host *shost = iscsi_session_to_shost(session);
535 struct iscsi_cls_host *ihost = shost->shost_data;
536 unsigned long flags;
537
538 /*
539 * The recovery and unblock work get run from the same workqueue,
540 * so try to cancel it if it was going to run after this unblock.
541 */
542 cancel_delayed_work(&session->recovery_work);
543 spin_lock_irqsave(&session->lock, flags);
544 session->state = ISCSI_SESSION_LOGGED_IN;
545 spin_unlock_irqrestore(&session->lock, flags);
546 /* start IO */
547 scsi_target_unblock(&session->dev);
548 /*
549 * Only do kernel scanning if the driver is properly hooked into
550 * the async scanning code (drivers like iscsi_tcp do login and
551 * scanning from userspace).
552 */
553 if (shost->hostt->scan_finished) {
554 if (scsi_queue_work(shost, &session->scan_work))
555 atomic_inc(&ihost->nr_scans);
556 }
557 }
558
559 /**
560 * iscsi_unblock_session - set a session as logged in and start IO.
561 * @session: iscsi session
562 *
563 * Mark a session as ready to accept IO.
564 */
565 void iscsi_unblock_session(struct iscsi_cls_session *session)
566 {
567 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
568 /*
569 * make sure all the events have completed before tell the driver
570 * it is safe
571 */
572 flush_workqueue(iscsi_eh_timer_workq);
573 }
574 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
575
576 static void __iscsi_block_session(struct work_struct *work)
577 {
578 struct iscsi_cls_session *session =
579 container_of(work, struct iscsi_cls_session,
580 block_work);
581 unsigned long flags;
582
583 spin_lock_irqsave(&session->lock, flags);
584 session->state = ISCSI_SESSION_FAILED;
585 spin_unlock_irqrestore(&session->lock, flags);
586 scsi_target_block(&session->dev);
587 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
588 session->recovery_tmo * HZ);
589 }
590
591 void iscsi_block_session(struct iscsi_cls_session *session)
592 {
593 queue_work(iscsi_eh_timer_workq, &session->block_work);
594 }
595 EXPORT_SYMBOL_GPL(iscsi_block_session);
596
597 static void __iscsi_unbind_session(struct work_struct *work)
598 {
599 struct iscsi_cls_session *session =
600 container_of(work, struct iscsi_cls_session,
601 unbind_work);
602 struct Scsi_Host *shost = iscsi_session_to_shost(session);
603 struct iscsi_cls_host *ihost = shost->shost_data;
604 unsigned long flags;
605
606 /* Prevent new scans and make sure scanning is not in progress */
607 mutex_lock(&ihost->mutex);
608 spin_lock_irqsave(&session->lock, flags);
609 if (session->target_id == ISCSI_MAX_TARGET) {
610 spin_unlock_irqrestore(&session->lock, flags);
611 mutex_unlock(&ihost->mutex);
612 return;
613 }
614 session->target_id = ISCSI_MAX_TARGET;
615 spin_unlock_irqrestore(&session->lock, flags);
616 mutex_unlock(&ihost->mutex);
617
618 scsi_remove_target(&session->dev);
619 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
620 }
621
622 struct iscsi_cls_session *
623 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
624 int dd_size)
625 {
626 struct iscsi_cls_session *session;
627
628 session = kzalloc(sizeof(*session) + dd_size,
629 GFP_KERNEL);
630 if (!session)
631 return NULL;
632
633 session->transport = transport;
634 session->recovery_tmo = 120;
635 session->state = ISCSI_SESSION_FREE;
636 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
637 INIT_LIST_HEAD(&session->sess_list);
638 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
639 INIT_WORK(&session->block_work, __iscsi_block_session);
640 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
641 INIT_WORK(&session->scan_work, iscsi_scan_session);
642 spin_lock_init(&session->lock);
643
644 /* this is released in the dev's release function */
645 scsi_host_get(shost);
646 session->dev.parent = &shost->shost_gendev;
647 session->dev.release = iscsi_session_release;
648 device_initialize(&session->dev);
649 if (dd_size)
650 session->dd_data = &session[1];
651 return session;
652 }
653 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
654
655 static int iscsi_get_next_target_id(struct device *dev, void *data)
656 {
657 struct iscsi_cls_session *session;
658 unsigned long flags;
659 int err = 0;
660
661 if (!iscsi_is_session_dev(dev))
662 return 0;
663
664 session = iscsi_dev_to_session(dev);
665 spin_lock_irqsave(&session->lock, flags);
666 if (*((unsigned int *) data) == session->target_id)
667 err = -EEXIST;
668 spin_unlock_irqrestore(&session->lock, flags);
669 return err;
670 }
671
672 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
673 {
674 struct Scsi_Host *shost = iscsi_session_to_shost(session);
675 struct iscsi_cls_host *ihost;
676 unsigned long flags;
677 unsigned int id = target_id;
678 int err;
679
680 ihost = shost->shost_data;
681 session->sid = atomic_add_return(1, &iscsi_session_nr);
682
683 if (id == ISCSI_MAX_TARGET) {
684 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
685 err = device_for_each_child(&shost->shost_gendev, &id,
686 iscsi_get_next_target_id);
687 if (!err)
688 break;
689 }
690
691 if (id == ISCSI_MAX_TARGET) {
692 iscsi_cls_session_printk(KERN_ERR, session,
693 "Too many iscsi targets. Max "
694 "number of targets is %d.\n",
695 ISCSI_MAX_TARGET - 1);
696 goto release_host;
697 }
698 }
699 session->target_id = id;
700
701 dev_set_name(&session->dev, "session%u", session->sid);
702 err = device_add(&session->dev);
703 if (err) {
704 iscsi_cls_session_printk(KERN_ERR, session,
705 "could not register session's dev\n");
706 goto release_host;
707 }
708 transport_register_device(&session->dev);
709
710 spin_lock_irqsave(&sesslock, flags);
711 list_add(&session->sess_list, &sesslist);
712 spin_unlock_irqrestore(&sesslock, flags);
713
714 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
715 return 0;
716
717 release_host:
718 scsi_host_put(shost);
719 return err;
720 }
721 EXPORT_SYMBOL_GPL(iscsi_add_session);
722
723 /**
724 * iscsi_create_session - create iscsi class session
725 * @shost: scsi host
726 * @transport: iscsi transport
727 * @dd_size: private driver data size
728 * @target_id: which target
729 *
730 * This can be called from a LLD or iscsi_transport.
731 */
732 struct iscsi_cls_session *
733 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
734 int dd_size, unsigned int target_id)
735 {
736 struct iscsi_cls_session *session;
737
738 session = iscsi_alloc_session(shost, transport, dd_size);
739 if (!session)
740 return NULL;
741
742 if (iscsi_add_session(session, target_id)) {
743 iscsi_free_session(session);
744 return NULL;
745 }
746 return session;
747 }
748 EXPORT_SYMBOL_GPL(iscsi_create_session);
749
750 static void iscsi_conn_release(struct device *dev)
751 {
752 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
753 struct device *parent = conn->dev.parent;
754
755 kfree(conn);
756 put_device(parent);
757 }
758
759 static int iscsi_is_conn_dev(const struct device *dev)
760 {
761 return dev->release == iscsi_conn_release;
762 }
763
764 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
765 {
766 if (!iscsi_is_conn_dev(dev))
767 return 0;
768 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
769 }
770
771 void iscsi_remove_session(struct iscsi_cls_session *session)
772 {
773 struct Scsi_Host *shost = iscsi_session_to_shost(session);
774 unsigned long flags;
775 int err;
776
777 spin_lock_irqsave(&sesslock, flags);
778 list_del(&session->sess_list);
779 spin_unlock_irqrestore(&sesslock, flags);
780
781 /* make sure there are no blocks/unblocks queued */
782 flush_workqueue(iscsi_eh_timer_workq);
783 /* make sure the timedout callout is not running */
784 if (!cancel_delayed_work(&session->recovery_work))
785 flush_workqueue(iscsi_eh_timer_workq);
786 /*
787 * If we are blocked let commands flow again. The lld or iscsi
788 * layer should set up the queuecommand to fail commands.
789 * We assume that LLD will not be calling block/unblock while
790 * removing the session.
791 */
792 spin_lock_irqsave(&session->lock, flags);
793 session->state = ISCSI_SESSION_FREE;
794 spin_unlock_irqrestore(&session->lock, flags);
795
796 scsi_target_unblock(&session->dev);
797 /* flush running scans then delete devices */
798 scsi_flush_work(shost);
799 __iscsi_unbind_session(&session->unbind_work);
800
801 /* hw iscsi may not have removed all connections from session */
802 err = device_for_each_child(&session->dev, NULL,
803 iscsi_iter_destroy_conn_fn);
804 if (err)
805 iscsi_cls_session_printk(KERN_ERR, session,
806 "Could not delete all connections "
807 "for session. Error %d.\n", err);
808
809 transport_unregister_device(&session->dev);
810 device_del(&session->dev);
811 }
812 EXPORT_SYMBOL_GPL(iscsi_remove_session);
813
814 void iscsi_free_session(struct iscsi_cls_session *session)
815 {
816 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
817 put_device(&session->dev);
818 }
819 EXPORT_SYMBOL_GPL(iscsi_free_session);
820
821 /**
822 * iscsi_destroy_session - destroy iscsi session
823 * @session: iscsi_session
824 *
825 * Can be called by a LLD or iscsi_transport. There must not be
826 * any running connections.
827 */
828 int iscsi_destroy_session(struct iscsi_cls_session *session)
829 {
830 iscsi_remove_session(session);
831 iscsi_free_session(session);
832 return 0;
833 }
834 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
835
836 /**
837 * iscsi_create_conn - create iscsi class connection
838 * @session: iscsi cls session
839 * @dd_size: private driver data size
840 * @cid: connection id
841 *
842 * This can be called from a LLD or iscsi_transport. The connection
843 * is child of the session so cid must be unique for all connections
844 * on the session.
845 *
846 * Since we do not support MCS, cid will normally be zero. In some cases
847 * for software iscsi we could be trying to preallocate a connection struct
848 * in which case there could be two connection structs and cid would be
849 * non-zero.
850 */
851 struct iscsi_cls_conn *
852 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
853 {
854 struct iscsi_transport *transport = session->transport;
855 struct iscsi_cls_conn *conn;
856 unsigned long flags;
857 int err;
858
859 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
860 if (!conn)
861 return NULL;
862 if (dd_size)
863 conn->dd_data = &conn[1];
864
865 INIT_LIST_HEAD(&conn->conn_list);
866 conn->transport = transport;
867 conn->cid = cid;
868
869 /* this is released in the dev's release function */
870 if (!get_device(&session->dev))
871 goto free_conn;
872
873 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
874 conn->dev.parent = &session->dev;
875 conn->dev.release = iscsi_conn_release;
876 err = device_register(&conn->dev);
877 if (err) {
878 iscsi_cls_session_printk(KERN_ERR, session, "could not "
879 "register connection's dev\n");
880 goto release_parent_ref;
881 }
882 transport_register_device(&conn->dev);
883
884 spin_lock_irqsave(&connlock, flags);
885 list_add(&conn->conn_list, &connlist);
886 conn->active = 1;
887 spin_unlock_irqrestore(&connlock, flags);
888 return conn;
889
890 release_parent_ref:
891 put_device(&session->dev);
892 free_conn:
893 kfree(conn);
894 return NULL;
895 }
896
897 EXPORT_SYMBOL_GPL(iscsi_create_conn);
898
899 /**
900 * iscsi_destroy_conn - destroy iscsi class connection
901 * @conn: iscsi cls session
902 *
903 * This can be called from a LLD or iscsi_transport.
904 */
905 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
906 {
907 unsigned long flags;
908
909 spin_lock_irqsave(&connlock, flags);
910 conn->active = 0;
911 list_del(&conn->conn_list);
912 spin_unlock_irqrestore(&connlock, flags);
913
914 transport_unregister_device(&conn->dev);
915 device_unregister(&conn->dev);
916 return 0;
917 }
918 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
919
920 /*
921 * iscsi interface functions
922 */
923 static struct iscsi_internal *
924 iscsi_if_transport_lookup(struct iscsi_transport *tt)
925 {
926 struct iscsi_internal *priv;
927 unsigned long flags;
928
929 spin_lock_irqsave(&iscsi_transport_lock, flags);
930 list_for_each_entry(priv, &iscsi_transports, list) {
931 if (tt == priv->iscsi_transport) {
932 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
933 return priv;
934 }
935 }
936 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
937 return NULL;
938 }
939
940 static int
941 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
942 {
943 return netlink_broadcast(nls, skb, 0, 1, gfp);
944 }
945
946 static int
947 iscsi_unicast_skb(struct sk_buff *skb, int pid)
948 {
949 int rc;
950
951 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
952 if (rc < 0) {
953 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
954 return rc;
955 }
956
957 return 0;
958 }
959
960 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
961 char *data, uint32_t data_size)
962 {
963 struct nlmsghdr *nlh;
964 struct sk_buff *skb;
965 struct iscsi_uevent *ev;
966 char *pdu;
967 struct iscsi_internal *priv;
968 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
969 data_size);
970
971 priv = iscsi_if_transport_lookup(conn->transport);
972 if (!priv)
973 return -EINVAL;
974
975 skb = alloc_skb(len, GFP_ATOMIC);
976 if (!skb) {
977 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
978 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
979 "control PDU: OOM\n");
980 return -ENOMEM;
981 }
982
983 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
984 ev = NLMSG_DATA(nlh);
985 memset(ev, 0, sizeof(*ev));
986 ev->transport_handle = iscsi_handle(conn->transport);
987 ev->type = ISCSI_KEVENT_RECV_PDU;
988 ev->r.recv_req.cid = conn->cid;
989 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
990 pdu = (char*)ev + sizeof(*ev);
991 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
992 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
993
994 return iscsi_unicast_skb(skb, priv->daemon_pid);
995 }
996 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
997
998 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
999 {
1000 struct nlmsghdr *nlh;
1001 struct sk_buff *skb;
1002 struct iscsi_uevent *ev;
1003 struct iscsi_internal *priv;
1004 int len = NLMSG_SPACE(sizeof(*ev));
1005
1006 priv = iscsi_if_transport_lookup(conn->transport);
1007 if (!priv)
1008 return;
1009
1010 skb = alloc_skb(len, GFP_ATOMIC);
1011 if (!skb) {
1012 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1013 "conn error (%d)\n", error);
1014 return;
1015 }
1016
1017 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1018 ev = NLMSG_DATA(nlh);
1019 ev->transport_handle = iscsi_handle(conn->transport);
1020 ev->type = ISCSI_KEVENT_CONN_ERROR;
1021 ev->r.connerror.error = error;
1022 ev->r.connerror.cid = conn->cid;
1023 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1024
1025 iscsi_broadcast_skb(skb, GFP_ATOMIC);
1026
1027 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1028 error);
1029 }
1030 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1031
1032 static int
1033 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1034 void *payload, int size)
1035 {
1036 struct sk_buff *skb;
1037 struct nlmsghdr *nlh;
1038 int len = NLMSG_SPACE(size);
1039 int flags = multi ? NLM_F_MULTI : 0;
1040 int t = done ? NLMSG_DONE : type;
1041
1042 skb = alloc_skb(len, GFP_ATOMIC);
1043 if (!skb) {
1044 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1045 return -ENOMEM;
1046 }
1047
1048 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1049 nlh->nlmsg_flags = flags;
1050 memcpy(NLMSG_DATA(nlh), payload, size);
1051 return iscsi_unicast_skb(skb, pid);
1052 }
1053
1054 static int
1055 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1056 {
1057 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1058 struct iscsi_stats *stats;
1059 struct sk_buff *skbstat;
1060 struct iscsi_cls_conn *conn;
1061 struct nlmsghdr *nlhstat;
1062 struct iscsi_uevent *evstat;
1063 struct iscsi_internal *priv;
1064 int len = NLMSG_SPACE(sizeof(*ev) +
1065 sizeof(struct iscsi_stats) +
1066 sizeof(struct iscsi_stats_custom) *
1067 ISCSI_STATS_CUSTOM_MAX);
1068 int err = 0;
1069
1070 priv = iscsi_if_transport_lookup(transport);
1071 if (!priv)
1072 return -EINVAL;
1073
1074 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1075 if (!conn)
1076 return -EEXIST;
1077
1078 do {
1079 int actual_size;
1080
1081 skbstat = alloc_skb(len, GFP_ATOMIC);
1082 if (!skbstat) {
1083 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1084 "deliver stats: OOM\n");
1085 return -ENOMEM;
1086 }
1087
1088 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
1089 (len - sizeof(*nlhstat)), 0);
1090 evstat = NLMSG_DATA(nlhstat);
1091 memset(evstat, 0, sizeof(*evstat));
1092 evstat->transport_handle = iscsi_handle(conn->transport);
1093 evstat->type = nlh->nlmsg_type;
1094 evstat->u.get_stats.cid =
1095 ev->u.get_stats.cid;
1096 evstat->u.get_stats.sid =
1097 ev->u.get_stats.sid;
1098 stats = (struct iscsi_stats *)
1099 ((char*)evstat + sizeof(*evstat));
1100 memset(stats, 0, sizeof(*stats));
1101
1102 transport->get_stats(conn, stats);
1103 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1104 sizeof(struct iscsi_stats) +
1105 sizeof(struct iscsi_stats_custom) *
1106 stats->custom_length);
1107 actual_size -= sizeof(*nlhstat);
1108 actual_size = NLMSG_LENGTH(actual_size);
1109 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1110 nlhstat->nlmsg_len = actual_size;
1111
1112 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
1113 } while (err < 0 && err != -ECONNREFUSED);
1114
1115 return err;
1116 }
1117
1118 /**
1119 * iscsi_session_event - send session destr. completion event
1120 * @session: iscsi class session
1121 * @event: type of event
1122 */
1123 int iscsi_session_event(struct iscsi_cls_session *session,
1124 enum iscsi_uevent_e event)
1125 {
1126 struct iscsi_internal *priv;
1127 struct Scsi_Host *shost;
1128 struct iscsi_uevent *ev;
1129 struct sk_buff *skb;
1130 struct nlmsghdr *nlh;
1131 int rc, len = NLMSG_SPACE(sizeof(*ev));
1132
1133 priv = iscsi_if_transport_lookup(session->transport);
1134 if (!priv)
1135 return -EINVAL;
1136 shost = iscsi_session_to_shost(session);
1137
1138 skb = alloc_skb(len, GFP_KERNEL);
1139 if (!skb) {
1140 iscsi_cls_session_printk(KERN_ERR, session,
1141 "Cannot notify userspace of session "
1142 "event %u\n", event);
1143 return -ENOMEM;
1144 }
1145
1146 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1147 ev = NLMSG_DATA(nlh);
1148 ev->transport_handle = iscsi_handle(session->transport);
1149
1150 ev->type = event;
1151 switch (event) {
1152 case ISCSI_KEVENT_DESTROY_SESSION:
1153 ev->r.d_session.host_no = shost->host_no;
1154 ev->r.d_session.sid = session->sid;
1155 break;
1156 case ISCSI_KEVENT_CREATE_SESSION:
1157 ev->r.c_session_ret.host_no = shost->host_no;
1158 ev->r.c_session_ret.sid = session->sid;
1159 break;
1160 case ISCSI_KEVENT_UNBIND_SESSION:
1161 ev->r.unbind_session.host_no = shost->host_no;
1162 ev->r.unbind_session.sid = session->sid;
1163 break;
1164 default:
1165 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1166 "%u.\n", event);
1167 kfree_skb(skb);
1168 return -EINVAL;
1169 }
1170
1171 /*
1172 * this will occur if the daemon is not up, so we just warn
1173 * the user and when the daemon is restarted it will handle it
1174 */
1175 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1176 if (rc == -ESRCH)
1177 iscsi_cls_session_printk(KERN_ERR, session,
1178 "Cannot notify userspace of session "
1179 "event %u. Check iscsi daemon\n",
1180 event);
1181 return rc;
1182 }
1183 EXPORT_SYMBOL_GPL(iscsi_session_event);
1184
1185 static int
1186 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1187 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1188 uint16_t cmds_max, uint16_t queue_depth)
1189 {
1190 struct iscsi_transport *transport = priv->iscsi_transport;
1191 struct iscsi_cls_session *session;
1192 struct Scsi_Host *shost;
1193
1194 session = transport->create_session(ep, cmds_max, queue_depth,
1195 initial_cmdsn);
1196 if (!session)
1197 return -ENOMEM;
1198
1199 shost = iscsi_session_to_shost(session);
1200 ev->r.c_session_ret.host_no = shost->host_no;
1201 ev->r.c_session_ret.sid = session->sid;
1202 return 0;
1203 }
1204
1205 static int
1206 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1207 {
1208 struct iscsi_cls_conn *conn;
1209 struct iscsi_cls_session *session;
1210
1211 session = iscsi_session_lookup(ev->u.c_conn.sid);
1212 if (!session) {
1213 printk(KERN_ERR "iscsi: invalid session %d.\n",
1214 ev->u.c_conn.sid);
1215 return -EINVAL;
1216 }
1217
1218 conn = transport->create_conn(session, ev->u.c_conn.cid);
1219 if (!conn) {
1220 iscsi_cls_session_printk(KERN_ERR, session,
1221 "couldn't create a new connection.");
1222 return -ENOMEM;
1223 }
1224
1225 ev->r.c_conn_ret.sid = session->sid;
1226 ev->r.c_conn_ret.cid = conn->cid;
1227 return 0;
1228 }
1229
1230 static int
1231 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1232 {
1233 struct iscsi_cls_conn *conn;
1234
1235 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1236 if (!conn)
1237 return -EINVAL;
1238
1239 if (transport->destroy_conn)
1240 transport->destroy_conn(conn);
1241 return 0;
1242 }
1243
1244 static int
1245 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1246 {
1247 char *data = (char*)ev + sizeof(*ev);
1248 struct iscsi_cls_conn *conn;
1249 struct iscsi_cls_session *session;
1250 int err = 0, value = 0;
1251
1252 session = iscsi_session_lookup(ev->u.set_param.sid);
1253 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1254 if (!conn || !session)
1255 return -EINVAL;
1256
1257 switch (ev->u.set_param.param) {
1258 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1259 sscanf(data, "%d", &value);
1260 if (value != 0)
1261 session->recovery_tmo = value;
1262 break;
1263 default:
1264 err = transport->set_param(conn, ev->u.set_param.param,
1265 data, ev->u.set_param.len);
1266 }
1267
1268 return err;
1269 }
1270
1271 static int
1272 iscsi_if_transport_ep(struct iscsi_transport *transport,
1273 struct iscsi_uevent *ev, int msg_type)
1274 {
1275 struct iscsi_endpoint *ep;
1276 struct sockaddr *dst_addr;
1277 int rc = 0;
1278
1279 switch (msg_type) {
1280 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1281 if (!transport->ep_connect)
1282 return -EINVAL;
1283
1284 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1285 ep = transport->ep_connect(dst_addr,
1286 ev->u.ep_connect.non_blocking);
1287 if (IS_ERR(ep))
1288 return PTR_ERR(ep);
1289
1290 ev->r.ep_connect_ret.handle = ep->id;
1291 break;
1292 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1293 if (!transport->ep_poll)
1294 return -EINVAL;
1295
1296 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1297 if (!ep)
1298 return -EINVAL;
1299
1300 ev->r.retcode = transport->ep_poll(ep,
1301 ev->u.ep_poll.timeout_ms);
1302 break;
1303 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1304 if (!transport->ep_disconnect)
1305 return -EINVAL;
1306
1307 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1308 if (!ep)
1309 return -EINVAL;
1310
1311 transport->ep_disconnect(ep);
1312 break;
1313 }
1314 return rc;
1315 }
1316
1317 static int
1318 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1319 struct iscsi_uevent *ev)
1320 {
1321 struct Scsi_Host *shost;
1322 struct sockaddr *dst_addr;
1323 int err;
1324
1325 if (!transport->tgt_dscvr)
1326 return -EINVAL;
1327
1328 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1329 if (!shost) {
1330 printk(KERN_ERR "target discovery could not find host no %u\n",
1331 ev->u.tgt_dscvr.host_no);
1332 return -ENODEV;
1333 }
1334
1335
1336 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1337 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1338 ev->u.tgt_dscvr.enable, dst_addr);
1339 scsi_host_put(shost);
1340 return err;
1341 }
1342
1343 static int
1344 iscsi_set_host_param(struct iscsi_transport *transport,
1345 struct iscsi_uevent *ev)
1346 {
1347 char *data = (char*)ev + sizeof(*ev);
1348 struct Scsi_Host *shost;
1349 int err;
1350
1351 if (!transport->set_host_param)
1352 return -ENOSYS;
1353
1354 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1355 if (!shost) {
1356 printk(KERN_ERR "set_host_param could not find host no %u\n",
1357 ev->u.set_host_param.host_no);
1358 return -ENODEV;
1359 }
1360
1361 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1362 data, ev->u.set_host_param.len);
1363 scsi_host_put(shost);
1364 return err;
1365 }
1366
1367 static int
1368 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1369 {
1370 int err = 0;
1371 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1372 struct iscsi_transport *transport = NULL;
1373 struct iscsi_internal *priv;
1374 struct iscsi_cls_session *session;
1375 struct iscsi_cls_conn *conn;
1376 struct iscsi_endpoint *ep = NULL;
1377
1378 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1379 if (!priv)
1380 return -EINVAL;
1381 transport = priv->iscsi_transport;
1382
1383 if (!try_module_get(transport->owner))
1384 return -EINVAL;
1385
1386 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1387
1388 switch (nlh->nlmsg_type) {
1389 case ISCSI_UEVENT_CREATE_SESSION:
1390 err = iscsi_if_create_session(priv, ep, ev,
1391 ev->u.c_session.initial_cmdsn,
1392 ev->u.c_session.cmds_max,
1393 ev->u.c_session.queue_depth);
1394 break;
1395 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1396 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1397 if (!ep) {
1398 err = -EINVAL;
1399 break;
1400 }
1401
1402 err = iscsi_if_create_session(priv, ep, ev,
1403 ev->u.c_bound_session.initial_cmdsn,
1404 ev->u.c_bound_session.cmds_max,
1405 ev->u.c_bound_session.queue_depth);
1406 break;
1407 case ISCSI_UEVENT_DESTROY_SESSION:
1408 session = iscsi_session_lookup(ev->u.d_session.sid);
1409 if (session)
1410 transport->destroy_session(session);
1411 else
1412 err = -EINVAL;
1413 break;
1414 case ISCSI_UEVENT_UNBIND_SESSION:
1415 session = iscsi_session_lookup(ev->u.d_session.sid);
1416 if (session)
1417 scsi_queue_work(iscsi_session_to_shost(session),
1418 &session->unbind_work);
1419 else
1420 err = -EINVAL;
1421 break;
1422 case ISCSI_UEVENT_CREATE_CONN:
1423 err = iscsi_if_create_conn(transport, ev);
1424 break;
1425 case ISCSI_UEVENT_DESTROY_CONN:
1426 err = iscsi_if_destroy_conn(transport, ev);
1427 break;
1428 case ISCSI_UEVENT_BIND_CONN:
1429 session = iscsi_session_lookup(ev->u.b_conn.sid);
1430 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1431
1432 if (session && conn)
1433 ev->r.retcode = transport->bind_conn(session, conn,
1434 ev->u.b_conn.transport_eph,
1435 ev->u.b_conn.is_leading);
1436 else
1437 err = -EINVAL;
1438 break;
1439 case ISCSI_UEVENT_SET_PARAM:
1440 err = iscsi_set_param(transport, ev);
1441 break;
1442 case ISCSI_UEVENT_START_CONN:
1443 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1444 if (conn)
1445 ev->r.retcode = transport->start_conn(conn);
1446 else
1447 err = -EINVAL;
1448 break;
1449 case ISCSI_UEVENT_STOP_CONN:
1450 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1451 if (conn)
1452 transport->stop_conn(conn, ev->u.stop_conn.flag);
1453 else
1454 err = -EINVAL;
1455 break;
1456 case ISCSI_UEVENT_SEND_PDU:
1457 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1458 if (conn)
1459 ev->r.retcode = transport->send_pdu(conn,
1460 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1461 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1462 ev->u.send_pdu.data_size);
1463 else
1464 err = -EINVAL;
1465 break;
1466 case ISCSI_UEVENT_GET_STATS:
1467 err = iscsi_if_get_stats(transport, nlh);
1468 break;
1469 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1470 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1471 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1472 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1473 break;
1474 case ISCSI_UEVENT_TGT_DSCVR:
1475 err = iscsi_tgt_dscvr(transport, ev);
1476 break;
1477 case ISCSI_UEVENT_SET_HOST_PARAM:
1478 err = iscsi_set_host_param(transport, ev);
1479 break;
1480 default:
1481 err = -ENOSYS;
1482 break;
1483 }
1484
1485 module_put(transport->owner);
1486 return err;
1487 }
1488
1489 /*
1490 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1491 * Malformed skbs with wrong lengths or invalid creds are not processed.
1492 */
1493 static void
1494 iscsi_if_rx(struct sk_buff *skb)
1495 {
1496 mutex_lock(&rx_queue_mutex);
1497 while (skb->len >= NLMSG_SPACE(0)) {
1498 int err;
1499 uint32_t rlen;
1500 struct nlmsghdr *nlh;
1501 struct iscsi_uevent *ev;
1502
1503 nlh = nlmsg_hdr(skb);
1504 if (nlh->nlmsg_len < sizeof(*nlh) ||
1505 skb->len < nlh->nlmsg_len) {
1506 break;
1507 }
1508
1509 ev = NLMSG_DATA(nlh);
1510 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1511 if (rlen > skb->len)
1512 rlen = skb->len;
1513
1514 err = iscsi_if_recv_msg(skb, nlh);
1515 if (err) {
1516 ev->type = ISCSI_KEVENT_IF_ERROR;
1517 ev->iferror = err;
1518 }
1519 do {
1520 /*
1521 * special case for GET_STATS:
1522 * on success - sending reply and stats from
1523 * inside of if_recv_msg(),
1524 * on error - fall through.
1525 */
1526 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1527 break;
1528 err = iscsi_if_send_reply(
1529 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1530 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1531 } while (err < 0 && err != -ECONNREFUSED);
1532 skb_pull(skb, rlen);
1533 }
1534 mutex_unlock(&rx_queue_mutex);
1535 }
1536
1537 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1538 struct device_attribute dev_attr_##_prefix##_##_name = \
1539 __ATTR(_name,_mode,_show,_store)
1540
1541 /*
1542 * iSCSI connection attrs
1543 */
1544 #define iscsi_conn_attr_show(param) \
1545 static ssize_t \
1546 show_conn_param_##param(struct device *dev, \
1547 struct device_attribute *attr, char *buf) \
1548 { \
1549 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1550 struct iscsi_transport *t = conn->transport; \
1551 return t->get_conn_param(conn, param, buf); \
1552 }
1553
1554 #define iscsi_conn_attr(field, param) \
1555 iscsi_conn_attr_show(param) \
1556 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1557 NULL);
1558
1559 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1560 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1561 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1562 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1563 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1564 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1565 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1566 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1567 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1568 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1569 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1570 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1571 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1572
1573 /*
1574 * iSCSI session attrs
1575 */
1576 #define iscsi_session_attr_show(param, perm) \
1577 static ssize_t \
1578 show_session_param_##param(struct device *dev, \
1579 struct device_attribute *attr, char *buf) \
1580 { \
1581 struct iscsi_cls_session *session = \
1582 iscsi_dev_to_session(dev->parent); \
1583 struct iscsi_transport *t = session->transport; \
1584 \
1585 if (perm && !capable(CAP_SYS_ADMIN)) \
1586 return -EACCES; \
1587 return t->get_session_param(session, param, buf); \
1588 }
1589
1590 #define iscsi_session_attr(field, param, perm) \
1591 iscsi_session_attr_show(param, perm) \
1592 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1593 NULL);
1594
1595 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1596 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1597 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1598 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1599 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1600 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1601 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1602 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1603 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1604 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1605 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1606 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1607 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1608 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1609 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1610 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1611 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1612 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1613 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1614
1615 static ssize_t
1616 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1617 char *buf)
1618 {
1619 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1620 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1621 }
1622 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1623 NULL);
1624
1625 #define iscsi_priv_session_attr_show(field, format) \
1626 static ssize_t \
1627 show_priv_session_##field(struct device *dev, \
1628 struct device_attribute *attr, char *buf) \
1629 { \
1630 struct iscsi_cls_session *session = \
1631 iscsi_dev_to_session(dev->parent); \
1632 return sprintf(buf, format"\n", session->field); \
1633 }
1634
1635 #define iscsi_priv_session_attr(field, format) \
1636 iscsi_priv_session_attr_show(field, format) \
1637 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1638 NULL)
1639 iscsi_priv_session_attr(recovery_tmo, "%d");
1640
1641 /*
1642 * iSCSI host attrs
1643 */
1644 #define iscsi_host_attr_show(param) \
1645 static ssize_t \
1646 show_host_param_##param(struct device *dev, \
1647 struct device_attribute *attr, char *buf) \
1648 { \
1649 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1650 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1651 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1652 }
1653
1654 #define iscsi_host_attr(field, param) \
1655 iscsi_host_attr_show(param) \
1656 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1657 NULL);
1658
1659 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1660 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1661 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1662 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1663
1664 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1665 do { \
1666 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1667 count++; \
1668 } while (0)
1669
1670
1671 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1672 do { \
1673 if (tt->param_mask & param_flag) { \
1674 priv->session_attrs[count] = &dev_attr_sess_##field; \
1675 count++; \
1676 } \
1677 } while (0)
1678
1679 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1680 do { \
1681 if (tt->param_mask & param_flag) { \
1682 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1683 count++; \
1684 } \
1685 } while (0)
1686
1687 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1688 do { \
1689 if (tt->host_param_mask & param_flag) { \
1690 priv->host_attrs[count] = &dev_attr_host_##field; \
1691 count++; \
1692 } \
1693 } while (0)
1694
1695 static int iscsi_session_match(struct attribute_container *cont,
1696 struct device *dev)
1697 {
1698 struct iscsi_cls_session *session;
1699 struct Scsi_Host *shost;
1700 struct iscsi_internal *priv;
1701
1702 if (!iscsi_is_session_dev(dev))
1703 return 0;
1704
1705 session = iscsi_dev_to_session(dev);
1706 shost = iscsi_session_to_shost(session);
1707 if (!shost->transportt)
1708 return 0;
1709
1710 priv = to_iscsi_internal(shost->transportt);
1711 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1712 return 0;
1713
1714 return &priv->session_cont.ac == cont;
1715 }
1716
1717 static int iscsi_conn_match(struct attribute_container *cont,
1718 struct device *dev)
1719 {
1720 struct iscsi_cls_session *session;
1721 struct iscsi_cls_conn *conn;
1722 struct Scsi_Host *shost;
1723 struct iscsi_internal *priv;
1724
1725 if (!iscsi_is_conn_dev(dev))
1726 return 0;
1727
1728 conn = iscsi_dev_to_conn(dev);
1729 session = iscsi_dev_to_session(conn->dev.parent);
1730 shost = iscsi_session_to_shost(session);
1731
1732 if (!shost->transportt)
1733 return 0;
1734
1735 priv = to_iscsi_internal(shost->transportt);
1736 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1737 return 0;
1738
1739 return &priv->conn_cont.ac == cont;
1740 }
1741
1742 static int iscsi_host_match(struct attribute_container *cont,
1743 struct device *dev)
1744 {
1745 struct Scsi_Host *shost;
1746 struct iscsi_internal *priv;
1747
1748 if (!scsi_is_host_device(dev))
1749 return 0;
1750
1751 shost = dev_to_shost(dev);
1752 if (!shost->transportt ||
1753 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1754 return 0;
1755
1756 priv = to_iscsi_internal(shost->transportt);
1757 return &priv->t.host_attrs.ac == cont;
1758 }
1759
1760 struct scsi_transport_template *
1761 iscsi_register_transport(struct iscsi_transport *tt)
1762 {
1763 struct iscsi_internal *priv;
1764 unsigned long flags;
1765 int count = 0, err;
1766
1767 BUG_ON(!tt);
1768
1769 priv = iscsi_if_transport_lookup(tt);
1770 if (priv)
1771 return NULL;
1772
1773 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1774 if (!priv)
1775 return NULL;
1776 INIT_LIST_HEAD(&priv->list);
1777 priv->daemon_pid = -1;
1778 priv->iscsi_transport = tt;
1779 priv->t.user_scan = iscsi_user_scan;
1780 priv->t.create_work_queue = 1;
1781
1782 priv->dev.class = &iscsi_transport_class;
1783 dev_set_name(&priv->dev, "%s", tt->name);
1784 err = device_register(&priv->dev);
1785 if (err)
1786 goto free_priv;
1787
1788 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1789 if (err)
1790 goto unregister_dev;
1791
1792 /* host parameters */
1793 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1794 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1795 priv->t.host_attrs.ac.match = iscsi_host_match;
1796 priv->t.host_size = sizeof(struct iscsi_cls_host);
1797 transport_container_register(&priv->t.host_attrs);
1798
1799 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1800 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1801 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1802 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1803 BUG_ON(count > ISCSI_HOST_ATTRS);
1804 priv->host_attrs[count] = NULL;
1805 count = 0;
1806
1807 /* connection parameters */
1808 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1809 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1810 priv->conn_cont.ac.match = iscsi_conn_match;
1811 transport_container_register(&priv->conn_cont);
1812
1813 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1814 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1815 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1816 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1817 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1818 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1819 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1820 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1821 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1822 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1823 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1824 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1825 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1826
1827 BUG_ON(count > ISCSI_CONN_ATTRS);
1828 priv->conn_attrs[count] = NULL;
1829 count = 0;
1830
1831 /* session parameters */
1832 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1833 priv->session_cont.ac.class = &iscsi_session_class.class;
1834 priv->session_cont.ac.match = iscsi_session_match;
1835 transport_container_register(&priv->session_cont);
1836
1837 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1838 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1839 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1840 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1841 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1842 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1843 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1844 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1845 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1846 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1847 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1848 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1849 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1850 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1851 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1852 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1853 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1854 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1855 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
1856 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1857 SETUP_PRIV_SESSION_RD_ATTR(state);
1858
1859 BUG_ON(count > ISCSI_SESSION_ATTRS);
1860 priv->session_attrs[count] = NULL;
1861
1862 spin_lock_irqsave(&iscsi_transport_lock, flags);
1863 list_add(&priv->list, &iscsi_transports);
1864 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1865
1866 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1867 return &priv->t;
1868
1869 unregister_dev:
1870 device_unregister(&priv->dev);
1871 return NULL;
1872 free_priv:
1873 kfree(priv);
1874 return NULL;
1875 }
1876 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1877
1878 int iscsi_unregister_transport(struct iscsi_transport *tt)
1879 {
1880 struct iscsi_internal *priv;
1881 unsigned long flags;
1882
1883 BUG_ON(!tt);
1884
1885 mutex_lock(&rx_queue_mutex);
1886
1887 priv = iscsi_if_transport_lookup(tt);
1888 BUG_ON (!priv);
1889
1890 spin_lock_irqsave(&iscsi_transport_lock, flags);
1891 list_del(&priv->list);
1892 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1893
1894 transport_container_unregister(&priv->conn_cont);
1895 transport_container_unregister(&priv->session_cont);
1896 transport_container_unregister(&priv->t.host_attrs);
1897
1898 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1899 device_unregister(&priv->dev);
1900 mutex_unlock(&rx_queue_mutex);
1901
1902 return 0;
1903 }
1904 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1905
1906 static __init int iscsi_transport_init(void)
1907 {
1908 int err;
1909
1910 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1911 ISCSI_TRANSPORT_VERSION);
1912
1913 atomic_set(&iscsi_session_nr, 0);
1914
1915 err = class_register(&iscsi_transport_class);
1916 if (err)
1917 return err;
1918
1919 err = class_register(&iscsi_endpoint_class);
1920 if (err)
1921 goto unregister_transport_class;
1922
1923 err = transport_class_register(&iscsi_host_class);
1924 if (err)
1925 goto unregister_endpoint_class;
1926
1927 err = transport_class_register(&iscsi_connection_class);
1928 if (err)
1929 goto unregister_host_class;
1930
1931 err = transport_class_register(&iscsi_session_class);
1932 if (err)
1933 goto unregister_conn_class;
1934
1935 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1936 NULL, THIS_MODULE);
1937 if (!nls) {
1938 err = -ENOBUFS;
1939 goto unregister_session_class;
1940 }
1941
1942 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1943 if (!iscsi_eh_timer_workq)
1944 goto release_nls;
1945
1946 return 0;
1947
1948 release_nls:
1949 netlink_kernel_release(nls);
1950 unregister_session_class:
1951 transport_class_unregister(&iscsi_session_class);
1952 unregister_conn_class:
1953 transport_class_unregister(&iscsi_connection_class);
1954 unregister_host_class:
1955 transport_class_unregister(&iscsi_host_class);
1956 unregister_endpoint_class:
1957 class_unregister(&iscsi_endpoint_class);
1958 unregister_transport_class:
1959 class_unregister(&iscsi_transport_class);
1960 return err;
1961 }
1962
1963 static void __exit iscsi_transport_exit(void)
1964 {
1965 destroy_workqueue(iscsi_eh_timer_workq);
1966 netlink_kernel_release(nls);
1967 transport_class_unregister(&iscsi_connection_class);
1968 transport_class_unregister(&iscsi_session_class);
1969 transport_class_unregister(&iscsi_host_class);
1970 class_unregister(&iscsi_endpoint_class);
1971 class_unregister(&iscsi_transport_class);
1972 }
1973
1974 module_init(iscsi_transport_init);
1975 module_exit(iscsi_transport_exit);
1976
1977 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1978 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1979 "Alex Aizman <itn780@yahoo.com>");
1980 MODULE_DESCRIPTION("iSCSI Transport Interface");
1981 MODULE_LICENSE("GPL");
1982 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
linux kernel for loongson