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prism54: convert to internal net_device_stats
[linux-2.6/x86.git] / drivers / scsi / scsi_transport_iscsi.c
blob2adfab8c11c1bd541e840094aa6730823a5d18b5
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
250 snprintf(ihost->scan_workq_name, sizeof(ihost->scan_workq_name),
251 "iscsi_scan_%d", shost->host_no);
252 ihost->scan_workq = create_singlethread_workqueue(
253 ihost->scan_workq_name);
254 if (!ihost->scan_workq)
255 return -ENOMEM;
256 return 0;
257 }
258
259 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
260 struct device *cdev)
261 {
262 struct Scsi_Host *shost = dev_to_shost(dev);
263 struct iscsi_cls_host *ihost = shost->shost_data;
264
265 destroy_workqueue(ihost->scan_workq);
266 return 0;
267 }
268
269 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
270 "iscsi_host",
271 iscsi_setup_host,
272 iscsi_remove_host,
273 NULL);
274
275 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
276 "iscsi_session",
277 NULL,
278 NULL,
279 NULL);
280
281 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
282 "iscsi_connection",
283 NULL,
284 NULL,
285 NULL);
286
287 static struct sock *nls;
288 static DEFINE_MUTEX(rx_queue_mutex);
289
290 static LIST_HEAD(sesslist);
291 static DEFINE_SPINLOCK(sesslock);
292 static LIST_HEAD(connlist);
293 static DEFINE_SPINLOCK(connlock);
294
295 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
296 {
297 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
298 return sess->sid;
299 }
300
301 /*
302 * Returns the matching session to a given sid
303 */
304 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
305 {
306 unsigned long flags;
307 struct iscsi_cls_session *sess;
308
309 spin_lock_irqsave(&sesslock, flags);
310 list_for_each_entry(sess, &sesslist, sess_list) {
311 if (sess->sid == sid) {
312 spin_unlock_irqrestore(&sesslock, flags);
313 return sess;
314 }
315 }
316 spin_unlock_irqrestore(&sesslock, flags);
317 return NULL;
318 }
319
320 /*
321 * Returns the matching connection to a given sid / cid tuple
322 */
323 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
324 {
325 unsigned long flags;
326 struct iscsi_cls_conn *conn;
327
328 spin_lock_irqsave(&connlock, flags);
329 list_for_each_entry(conn, &connlist, conn_list) {
330 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
331 spin_unlock_irqrestore(&connlock, flags);
332 return conn;
333 }
334 }
335 spin_unlock_irqrestore(&connlock, flags);
336 return NULL;
337 }
338
339 /*
340 * The following functions can be used by LLDs that allocate
341 * their own scsi_hosts or by software iscsi LLDs
342 */
343 static struct {
344 int value;
345 char *name;
346 } iscsi_session_state_names[] = {
347 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
348 { ISCSI_SESSION_FAILED, "FAILED" },
349 { ISCSI_SESSION_FREE, "FREE" },
350 };
351
352 static const char *iscsi_session_state_name(int state)
353 {
354 int i;
355 char *name = NULL;
356
357 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
358 if (iscsi_session_state_names[i].value == state) {
359 name = iscsi_session_state_names[i].name;
360 break;
361 }
362 }
363 return name;
364 }
365
366 int iscsi_session_chkready(struct iscsi_cls_session *session)
367 {
368 unsigned long flags;
369 int err;
370
371 spin_lock_irqsave(&session->lock, flags);
372 switch (session->state) {
373 case ISCSI_SESSION_LOGGED_IN:
374 err = 0;
375 break;
376 case ISCSI_SESSION_FAILED:
377 err = DID_TRANSPORT_DISRUPTED << 16;
378 break;
379 case ISCSI_SESSION_FREE:
380 err = DID_TRANSPORT_FAILFAST << 16;
381 break;
382 default:
383 err = DID_NO_CONNECT << 16;
384 break;
385 }
386 spin_unlock_irqrestore(&session->lock, flags);
387 return err;
388 }
389 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
390
391 static void iscsi_session_release(struct device *dev)
392 {
393 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
394 struct Scsi_Host *shost;
395
396 shost = iscsi_session_to_shost(session);
397 scsi_host_put(shost);
398 kfree(session);
399 }
400
401 static int iscsi_is_session_dev(const struct device *dev)
402 {
403 return dev->release == iscsi_session_release;
404 }
405
406 static int iscsi_iter_session_fn(struct device *dev, void *data)
407 {
408 void (* fn) (struct iscsi_cls_session *) = data;
409
410 if (!iscsi_is_session_dev(dev))
411 return 0;
412 fn(iscsi_dev_to_session(dev));
413 return 0;
414 }
415
416 void iscsi_host_for_each_session(struct Scsi_Host *shost,
417 void (*fn)(struct iscsi_cls_session *))
418 {
419 device_for_each_child(&shost->shost_gendev, fn,
420 iscsi_iter_session_fn);
421 }
422 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
423
424 /**
425 * iscsi_scan_finished - helper to report when running scans are done
426 * @shost: scsi host
427 * @time: scan run time
428 *
429 * This function can be used by drives like qla4xxx to report to the scsi
430 * layer when the scans it kicked off at module load time are done.
431 */
432 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
433 {
434 struct iscsi_cls_host *ihost = shost->shost_data;
435 /*
436 * qla4xxx will have kicked off some session unblocks before calling
437 * scsi_scan_host, so just wait for them to complete.
438 */
439 return !atomic_read(&ihost->nr_scans);
440 }
441 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
442
443 struct iscsi_scan_data {
444 unsigned int channel;
445 unsigned int id;
446 unsigned int lun;
447 };
448
449 static int iscsi_user_scan_session(struct device *dev, void *data)
450 {
451 struct iscsi_scan_data *scan_data = data;
452 struct iscsi_cls_session *session;
453 struct Scsi_Host *shost;
454 struct iscsi_cls_host *ihost;
455 unsigned long flags;
456 unsigned int id;
457
458 if (!iscsi_is_session_dev(dev))
459 return 0;
460
461 session = iscsi_dev_to_session(dev);
462 shost = iscsi_session_to_shost(session);
463 ihost = shost->shost_data;
464
465 mutex_lock(&ihost->mutex);
466 spin_lock_irqsave(&session->lock, flags);
467 if (session->state != ISCSI_SESSION_LOGGED_IN) {
468 spin_unlock_irqrestore(&session->lock, flags);
469 mutex_unlock(&ihost->mutex);
470 return 0;
471 }
472 id = session->target_id;
473 spin_unlock_irqrestore(&session->lock, flags);
474
475 if (id != ISCSI_MAX_TARGET) {
476 if ((scan_data->channel == SCAN_WILD_CARD ||
477 scan_data->channel == 0) &&
478 (scan_data->id == SCAN_WILD_CARD ||
479 scan_data->id == id))
480 scsi_scan_target(&session->dev, 0, id,
481 scan_data->lun, 1);
482 }
483 mutex_unlock(&ihost->mutex);
484 return 0;
485 }
486
487 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
488 uint id, uint lun)
489 {
490 struct iscsi_scan_data scan_data;
491
492 scan_data.channel = channel;
493 scan_data.id = id;
494 scan_data.lun = lun;
495
496 return device_for_each_child(&shost->shost_gendev, &scan_data,
497 iscsi_user_scan_session);
498 }
499
500 static void iscsi_scan_session(struct work_struct *work)
501 {
502 struct iscsi_cls_session *session =
503 container_of(work, struct iscsi_cls_session, scan_work);
504 struct Scsi_Host *shost = iscsi_session_to_shost(session);
505 struct iscsi_cls_host *ihost = shost->shost_data;
506 struct iscsi_scan_data scan_data;
507
508 scan_data.channel = 0;
509 scan_data.id = SCAN_WILD_CARD;
510 scan_data.lun = SCAN_WILD_CARD;
511
512 iscsi_user_scan_session(&session->dev, &scan_data);
513 atomic_dec(&ihost->nr_scans);
514 }
515
516 static void session_recovery_timedout(struct work_struct *work)
517 {
518 struct iscsi_cls_session *session =
519 container_of(work, struct iscsi_cls_session,
520 recovery_work.work);
521 unsigned long flags;
522
523 iscsi_cls_session_printk(KERN_INFO, session,
524 "session recovery timed out after %d secs\n",
525 session->recovery_tmo);
526
527 spin_lock_irqsave(&session->lock, flags);
528 switch (session->state) {
529 case ISCSI_SESSION_FAILED:
530 session->state = ISCSI_SESSION_FREE;
531 break;
532 case ISCSI_SESSION_LOGGED_IN:
533 case ISCSI_SESSION_FREE:
534 /* we raced with the unblock's flush */
535 spin_unlock_irqrestore(&session->lock, flags);
536 return;
537 }
538 spin_unlock_irqrestore(&session->lock, flags);
539
540 if (session->transport->session_recovery_timedout)
541 session->transport->session_recovery_timedout(session);
542
543 scsi_target_unblock(&session->dev);
544 }
545
546 static void __iscsi_unblock_session(struct work_struct *work)
547 {
548 struct iscsi_cls_session *session =
549 container_of(work, struct iscsi_cls_session,
550 unblock_work);
551 struct Scsi_Host *shost = iscsi_session_to_shost(session);
552 struct iscsi_cls_host *ihost = shost->shost_data;
553 unsigned long flags;
554
555 /*
556 * The recovery and unblock work get run from the same workqueue,
557 * so try to cancel it if it was going to run after this unblock.
558 */
559 cancel_delayed_work(&session->recovery_work);
560 spin_lock_irqsave(&session->lock, flags);
561 session->state = ISCSI_SESSION_LOGGED_IN;
562 spin_unlock_irqrestore(&session->lock, flags);
563 /* start IO */
564 scsi_target_unblock(&session->dev);
565 /*
566 * Only do kernel scanning if the driver is properly hooked into
567 * the async scanning code (drivers like iscsi_tcp do login and
568 * scanning from userspace).
569 */
570 if (shost->hostt->scan_finished) {
571 if (queue_work(ihost->scan_workq, &session->scan_work))
572 atomic_inc(&ihost->nr_scans);
573 }
574 }
575
576 /**
577 * iscsi_unblock_session - set a session as logged in and start IO.
578 * @session: iscsi session
579 *
580 * Mark a session as ready to accept IO.
581 */
582 void iscsi_unblock_session(struct iscsi_cls_session *session)
583 {
584 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
585 /*
586 * make sure all the events have completed before tell the driver
587 * it is safe
588 */
589 flush_workqueue(iscsi_eh_timer_workq);
590 }
591 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
592
593 static void __iscsi_block_session(struct work_struct *work)
594 {
595 struct iscsi_cls_session *session =
596 container_of(work, struct iscsi_cls_session,
597 block_work);
598 unsigned long flags;
599
600 spin_lock_irqsave(&session->lock, flags);
601 session->state = ISCSI_SESSION_FAILED;
602 spin_unlock_irqrestore(&session->lock, flags);
603 scsi_target_block(&session->dev);
604 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
605 session->recovery_tmo * HZ);
606 }
607
608 void iscsi_block_session(struct iscsi_cls_session *session)
609 {
610 queue_work(iscsi_eh_timer_workq, &session->block_work);
611 }
612 EXPORT_SYMBOL_GPL(iscsi_block_session);
613
614 static void __iscsi_unbind_session(struct work_struct *work)
615 {
616 struct iscsi_cls_session *session =
617 container_of(work, struct iscsi_cls_session,
618 unbind_work);
619 struct Scsi_Host *shost = iscsi_session_to_shost(session);
620 struct iscsi_cls_host *ihost = shost->shost_data;
621 unsigned long flags;
622
623 /* Prevent new scans and make sure scanning is not in progress */
624 mutex_lock(&ihost->mutex);
625 spin_lock_irqsave(&session->lock, flags);
626 if (session->target_id == ISCSI_MAX_TARGET) {
627 spin_unlock_irqrestore(&session->lock, flags);
628 mutex_unlock(&ihost->mutex);
629 return;
630 }
631 session->target_id = ISCSI_MAX_TARGET;
632 spin_unlock_irqrestore(&session->lock, flags);
633 mutex_unlock(&ihost->mutex);
634
635 scsi_remove_target(&session->dev);
636 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
637 }
638
639 static int iscsi_unbind_session(struct iscsi_cls_session *session)
640 {
641 struct Scsi_Host *shost = iscsi_session_to_shost(session);
642 struct iscsi_cls_host *ihost = shost->shost_data;
643
644 return queue_work(ihost->scan_workq, &session->unbind_work);
645 }
646
647 struct iscsi_cls_session *
648 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
649 int dd_size)
650 {
651 struct iscsi_cls_session *session;
652
653 session = kzalloc(sizeof(*session) + dd_size,
654 GFP_KERNEL);
655 if (!session)
656 return NULL;
657
658 session->transport = transport;
659 session->recovery_tmo = 120;
660 session->state = ISCSI_SESSION_FREE;
661 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
662 INIT_LIST_HEAD(&session->sess_list);
663 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
664 INIT_WORK(&session->block_work, __iscsi_block_session);
665 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
666 INIT_WORK(&session->scan_work, iscsi_scan_session);
667 spin_lock_init(&session->lock);
668
669 /* this is released in the dev's release function */
670 scsi_host_get(shost);
671 session->dev.parent = &shost->shost_gendev;
672 session->dev.release = iscsi_session_release;
673 device_initialize(&session->dev);
674 if (dd_size)
675 session->dd_data = &session[1];
676 return session;
677 }
678 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
679
680 static int iscsi_get_next_target_id(struct device *dev, void *data)
681 {
682 struct iscsi_cls_session *session;
683 unsigned long flags;
684 int err = 0;
685
686 if (!iscsi_is_session_dev(dev))
687 return 0;
688
689 session = iscsi_dev_to_session(dev);
690 spin_lock_irqsave(&session->lock, flags);
691 if (*((unsigned int *) data) == session->target_id)
692 err = -EEXIST;
693 spin_unlock_irqrestore(&session->lock, flags);
694 return err;
695 }
696
697 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
698 {
699 struct Scsi_Host *shost = iscsi_session_to_shost(session);
700 struct iscsi_cls_host *ihost;
701 unsigned long flags;
702 unsigned int id = target_id;
703 int err;
704
705 ihost = shost->shost_data;
706 session->sid = atomic_add_return(1, &iscsi_session_nr);
707
708 if (id == ISCSI_MAX_TARGET) {
709 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
710 err = device_for_each_child(&shost->shost_gendev, &id,
711 iscsi_get_next_target_id);
712 if (!err)
713 break;
714 }
715
716 if (id == ISCSI_MAX_TARGET) {
717 iscsi_cls_session_printk(KERN_ERR, session,
718 "Too many iscsi targets. Max "
719 "number of targets is %d.\n",
720 ISCSI_MAX_TARGET - 1);
721 goto release_host;
722 }
723 }
724 session->target_id = id;
725
726 dev_set_name(&session->dev, "session%u", session->sid);
727 err = device_add(&session->dev);
728 if (err) {
729 iscsi_cls_session_printk(KERN_ERR, session,
730 "could not register session's dev\n");
731 goto release_host;
732 }
733 transport_register_device(&session->dev);
734
735 spin_lock_irqsave(&sesslock, flags);
736 list_add(&session->sess_list, &sesslist);
737 spin_unlock_irqrestore(&sesslock, flags);
738
739 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
740 return 0;
741
742 release_host:
743 scsi_host_put(shost);
744 return err;
745 }
746 EXPORT_SYMBOL_GPL(iscsi_add_session);
747
748 /**
749 * iscsi_create_session - create iscsi class session
750 * @shost: scsi host
751 * @transport: iscsi transport
752 * @dd_size: private driver data size
753 * @target_id: which target
754 *
755 * This can be called from a LLD or iscsi_transport.
756 */
757 struct iscsi_cls_session *
758 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
759 int dd_size, unsigned int target_id)
760 {
761 struct iscsi_cls_session *session;
762
763 session = iscsi_alloc_session(shost, transport, dd_size);
764 if (!session)
765 return NULL;
766
767 if (iscsi_add_session(session, target_id)) {
768 iscsi_free_session(session);
769 return NULL;
770 }
771 return session;
772 }
773 EXPORT_SYMBOL_GPL(iscsi_create_session);
774
775 static void iscsi_conn_release(struct device *dev)
776 {
777 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
778 struct device *parent = conn->dev.parent;
779
780 kfree(conn);
781 put_device(parent);
782 }
783
784 static int iscsi_is_conn_dev(const struct device *dev)
785 {
786 return dev->release == iscsi_conn_release;
787 }
788
789 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
790 {
791 if (!iscsi_is_conn_dev(dev))
792 return 0;
793 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
794 }
795
796 void iscsi_remove_session(struct iscsi_cls_session *session)
797 {
798 struct Scsi_Host *shost = iscsi_session_to_shost(session);
799 struct iscsi_cls_host *ihost = shost->shost_data;
800 unsigned long flags;
801 int err;
802
803 spin_lock_irqsave(&sesslock, flags);
804 list_del(&session->sess_list);
805 spin_unlock_irqrestore(&sesslock, flags);
806
807 /* make sure there are no blocks/unblocks queued */
808 flush_workqueue(iscsi_eh_timer_workq);
809 /* make sure the timedout callout is not running */
810 if (!cancel_delayed_work(&session->recovery_work))
811 flush_workqueue(iscsi_eh_timer_workq);
812 /*
813 * If we are blocked let commands flow again. The lld or iscsi
814 * layer should set up the queuecommand to fail commands.
815 * We assume that LLD will not be calling block/unblock while
816 * removing the session.
817 */
818 spin_lock_irqsave(&session->lock, flags);
819 session->state = ISCSI_SESSION_FREE;
820 spin_unlock_irqrestore(&session->lock, flags);
821
822 scsi_target_unblock(&session->dev);
823 /* flush running scans then delete devices */
824 flush_workqueue(ihost->scan_workq);
825 __iscsi_unbind_session(&session->unbind_work);
826
827 /* hw iscsi may not have removed all connections from session */
828 err = device_for_each_child(&session->dev, NULL,
829 iscsi_iter_destroy_conn_fn);
830 if (err)
831 iscsi_cls_session_printk(KERN_ERR, session,
832 "Could not delete all connections "
833 "for session. Error %d.\n", err);
834
835 transport_unregister_device(&session->dev);
836 device_del(&session->dev);
837 }
838 EXPORT_SYMBOL_GPL(iscsi_remove_session);
839
840 void iscsi_free_session(struct iscsi_cls_session *session)
841 {
842 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
843 put_device(&session->dev);
844 }
845 EXPORT_SYMBOL_GPL(iscsi_free_session);
846
847 /**
848 * iscsi_destroy_session - destroy iscsi session
849 * @session: iscsi_session
850 *
851 * Can be called by a LLD or iscsi_transport. There must not be
852 * any running connections.
853 */
854 int iscsi_destroy_session(struct iscsi_cls_session *session)
855 {
856 iscsi_remove_session(session);
857 iscsi_free_session(session);
858 return 0;
859 }
860 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
861
862 /**
863 * iscsi_create_conn - create iscsi class connection
864 * @session: iscsi cls session
865 * @dd_size: private driver data size
866 * @cid: connection id
867 *
868 * This can be called from a LLD or iscsi_transport. The connection
869 * is child of the session so cid must be unique for all connections
870 * on the session.
871 *
872 * Since we do not support MCS, cid will normally be zero. In some cases
873 * for software iscsi we could be trying to preallocate a connection struct
874 * in which case there could be two connection structs and cid would be
875 * non-zero.
876 */
877 struct iscsi_cls_conn *
878 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
879 {
880 struct iscsi_transport *transport = session->transport;
881 struct iscsi_cls_conn *conn;
882 unsigned long flags;
883 int err;
884
885 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
886 if (!conn)
887 return NULL;
888 if (dd_size)
889 conn->dd_data = &conn[1];
890
891 INIT_LIST_HEAD(&conn->conn_list);
892 conn->transport = transport;
893 conn->cid = cid;
894
895 /* this is released in the dev's release function */
896 if (!get_device(&session->dev))
897 goto free_conn;
898
899 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
900 conn->dev.parent = &session->dev;
901 conn->dev.release = iscsi_conn_release;
902 err = device_register(&conn->dev);
903 if (err) {
904 iscsi_cls_session_printk(KERN_ERR, session, "could not "
905 "register connection's dev\n");
906 goto release_parent_ref;
907 }
908 transport_register_device(&conn->dev);
909
910 spin_lock_irqsave(&connlock, flags);
911 list_add(&conn->conn_list, &connlist);
912 conn->active = 1;
913 spin_unlock_irqrestore(&connlock, flags);
914 return conn;
915
916 release_parent_ref:
917 put_device(&session->dev);
918 free_conn:
919 kfree(conn);
920 return NULL;
921 }
922
923 EXPORT_SYMBOL_GPL(iscsi_create_conn);
924
925 /**
926 * iscsi_destroy_conn - destroy iscsi class connection
927 * @conn: iscsi cls session
928 *
929 * This can be called from a LLD or iscsi_transport.
930 */
931 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
932 {
933 unsigned long flags;
934
935 spin_lock_irqsave(&connlock, flags);
936 conn->active = 0;
937 list_del(&conn->conn_list);
938 spin_unlock_irqrestore(&connlock, flags);
939
940 transport_unregister_device(&conn->dev);
941 device_unregister(&conn->dev);
942 return 0;
943 }
944 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
945
946 /*
947 * iscsi interface functions
948 */
949 static struct iscsi_internal *
950 iscsi_if_transport_lookup(struct iscsi_transport *tt)
951 {
952 struct iscsi_internal *priv;
953 unsigned long flags;
954
955 spin_lock_irqsave(&iscsi_transport_lock, flags);
956 list_for_each_entry(priv, &iscsi_transports, list) {
957 if (tt == priv->iscsi_transport) {
958 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
959 return priv;
960 }
961 }
962 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
963 return NULL;
964 }
965
966 static int
967 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
968 {
969 return netlink_broadcast(nls, skb, 0, 1, gfp);
970 }
971
972 static int
973 iscsi_unicast_skb(struct sk_buff *skb, int pid)
974 {
975 int rc;
976
977 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
978 if (rc < 0) {
979 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
980 return rc;
981 }
982
983 return 0;
984 }
985
986 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
987 char *data, uint32_t data_size)
988 {
989 struct nlmsghdr *nlh;
990 struct sk_buff *skb;
991 struct iscsi_uevent *ev;
992 char *pdu;
993 struct iscsi_internal *priv;
994 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
995 data_size);
996
997 priv = iscsi_if_transport_lookup(conn->transport);
998 if (!priv)
999 return -EINVAL;
1000
1001 skb = alloc_skb(len, GFP_ATOMIC);
1002 if (!skb) {
1003 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1004 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1005 "control PDU: OOM\n");
1006 return -ENOMEM;
1007 }
1008
1009 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1010 ev = NLMSG_DATA(nlh);
1011 memset(ev, 0, sizeof(*ev));
1012 ev->transport_handle = iscsi_handle(conn->transport);
1013 ev->type = ISCSI_KEVENT_RECV_PDU;
1014 ev->r.recv_req.cid = conn->cid;
1015 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1016 pdu = (char*)ev + sizeof(*ev);
1017 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1018 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1019
1020 return iscsi_unicast_skb(skb, priv->daemon_pid);
1021 }
1022 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1023
1024 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1025 {
1026 struct nlmsghdr *nlh;
1027 struct sk_buff *skb;
1028 struct iscsi_uevent *ev;
1029 struct iscsi_internal *priv;
1030 int len = NLMSG_SPACE(sizeof(*ev));
1031
1032 priv = iscsi_if_transport_lookup(conn->transport);
1033 if (!priv)
1034 return;
1035
1036 skb = alloc_skb(len, GFP_ATOMIC);
1037 if (!skb) {
1038 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1039 "conn error (%d)\n", error);
1040 return;
1041 }
1042
1043 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1044 ev = NLMSG_DATA(nlh);
1045 ev->transport_handle = iscsi_handle(conn->transport);
1046 ev->type = ISCSI_KEVENT_CONN_ERROR;
1047 ev->r.connerror.error = error;
1048 ev->r.connerror.cid = conn->cid;
1049 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1050
1051 iscsi_broadcast_skb(skb, GFP_ATOMIC);
1052
1053 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1054 error);
1055 }
1056 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1057
1058 static int
1059 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1060 void *payload, int size)
1061 {
1062 struct sk_buff *skb;
1063 struct nlmsghdr *nlh;
1064 int len = NLMSG_SPACE(size);
1065 int flags = multi ? NLM_F_MULTI : 0;
1066 int t = done ? NLMSG_DONE : type;
1067
1068 skb = alloc_skb(len, GFP_ATOMIC);
1069 if (!skb) {
1070 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1071 return -ENOMEM;
1072 }
1073
1074 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1075 nlh->nlmsg_flags = flags;
1076 memcpy(NLMSG_DATA(nlh), payload, size);
1077 return iscsi_unicast_skb(skb, pid);
1078 }
1079
1080 static int
1081 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1082 {
1083 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1084 struct iscsi_stats *stats;
1085 struct sk_buff *skbstat;
1086 struct iscsi_cls_conn *conn;
1087 struct nlmsghdr *nlhstat;
1088 struct iscsi_uevent *evstat;
1089 struct iscsi_internal *priv;
1090 int len = NLMSG_SPACE(sizeof(*ev) +
1091 sizeof(struct iscsi_stats) +
1092 sizeof(struct iscsi_stats_custom) *
1093 ISCSI_STATS_CUSTOM_MAX);
1094 int err = 0;
1095
1096 priv = iscsi_if_transport_lookup(transport);
1097 if (!priv)
1098 return -EINVAL;
1099
1100 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1101 if (!conn)
1102 return -EEXIST;
1103
1104 do {
1105 int actual_size;
1106
1107 skbstat = alloc_skb(len, GFP_ATOMIC);
1108 if (!skbstat) {
1109 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1110 "deliver stats: OOM\n");
1111 return -ENOMEM;
1112 }
1113
1114 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
1115 (len - sizeof(*nlhstat)), 0);
1116 evstat = NLMSG_DATA(nlhstat);
1117 memset(evstat, 0, sizeof(*evstat));
1118 evstat->transport_handle = iscsi_handle(conn->transport);
1119 evstat->type = nlh->nlmsg_type;
1120 evstat->u.get_stats.cid =
1121 ev->u.get_stats.cid;
1122 evstat->u.get_stats.sid =
1123 ev->u.get_stats.sid;
1124 stats = (struct iscsi_stats *)
1125 ((char*)evstat + sizeof(*evstat));
1126 memset(stats, 0, sizeof(*stats));
1127
1128 transport->get_stats(conn, stats);
1129 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1130 sizeof(struct iscsi_stats) +
1131 sizeof(struct iscsi_stats_custom) *
1132 stats->custom_length);
1133 actual_size -= sizeof(*nlhstat);
1134 actual_size = NLMSG_LENGTH(actual_size);
1135 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1136 nlhstat->nlmsg_len = actual_size;
1137
1138 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
1139 } while (err < 0 && err != -ECONNREFUSED);
1140
1141 return err;
1142 }
1143
1144 /**
1145 * iscsi_session_event - send session destr. completion event
1146 * @session: iscsi class session
1147 * @event: type of event
1148 */
1149 int iscsi_session_event(struct iscsi_cls_session *session,
1150 enum iscsi_uevent_e event)
1151 {
1152 struct iscsi_internal *priv;
1153 struct Scsi_Host *shost;
1154 struct iscsi_uevent *ev;
1155 struct sk_buff *skb;
1156 struct nlmsghdr *nlh;
1157 int rc, len = NLMSG_SPACE(sizeof(*ev));
1158
1159 priv = iscsi_if_transport_lookup(session->transport);
1160 if (!priv)
1161 return -EINVAL;
1162 shost = iscsi_session_to_shost(session);
1163
1164 skb = alloc_skb(len, GFP_KERNEL);
1165 if (!skb) {
1166 iscsi_cls_session_printk(KERN_ERR, session,
1167 "Cannot notify userspace of session "
1168 "event %u\n", event);
1169 return -ENOMEM;
1170 }
1171
1172 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1173 ev = NLMSG_DATA(nlh);
1174 ev->transport_handle = iscsi_handle(session->transport);
1175
1176 ev->type = event;
1177 switch (event) {
1178 case ISCSI_KEVENT_DESTROY_SESSION:
1179 ev->r.d_session.host_no = shost->host_no;
1180 ev->r.d_session.sid = session->sid;
1181 break;
1182 case ISCSI_KEVENT_CREATE_SESSION:
1183 ev->r.c_session_ret.host_no = shost->host_no;
1184 ev->r.c_session_ret.sid = session->sid;
1185 break;
1186 case ISCSI_KEVENT_UNBIND_SESSION:
1187 ev->r.unbind_session.host_no = shost->host_no;
1188 ev->r.unbind_session.sid = session->sid;
1189 break;
1190 default:
1191 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1192 "%u.\n", event);
1193 kfree_skb(skb);
1194 return -EINVAL;
1195 }
1196
1197 /*
1198 * this will occur if the daemon is not up, so we just warn
1199 * the user and when the daemon is restarted it will handle it
1200 */
1201 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1202 if (rc == -ESRCH)
1203 iscsi_cls_session_printk(KERN_ERR, session,
1204 "Cannot notify userspace of session "
1205 "event %u. Check iscsi daemon\n",
1206 event);
1207 return rc;
1208 }
1209 EXPORT_SYMBOL_GPL(iscsi_session_event);
1210
1211 static int
1212 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1213 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1214 uint16_t cmds_max, uint16_t queue_depth)
1215 {
1216 struct iscsi_transport *transport = priv->iscsi_transport;
1217 struct iscsi_cls_session *session;
1218 uint32_t host_no;
1219
1220 session = transport->create_session(ep, cmds_max, queue_depth,
1221 initial_cmdsn, &host_no);
1222 if (!session)
1223 return -ENOMEM;
1224
1225 ev->r.c_session_ret.host_no = host_no;
1226 ev->r.c_session_ret.sid = session->sid;
1227 return 0;
1228 }
1229
1230 static int
1231 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1232 {
1233 struct iscsi_cls_conn *conn;
1234 struct iscsi_cls_session *session;
1235
1236 session = iscsi_session_lookup(ev->u.c_conn.sid);
1237 if (!session) {
1238 printk(KERN_ERR "iscsi: invalid session %d.\n",
1239 ev->u.c_conn.sid);
1240 return -EINVAL;
1241 }
1242
1243 conn = transport->create_conn(session, ev->u.c_conn.cid);
1244 if (!conn) {
1245 iscsi_cls_session_printk(KERN_ERR, session,
1246 "couldn't create a new connection.");
1247 return -ENOMEM;
1248 }
1249
1250 ev->r.c_conn_ret.sid = session->sid;
1251 ev->r.c_conn_ret.cid = conn->cid;
1252 return 0;
1253 }
1254
1255 static int
1256 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1257 {
1258 struct iscsi_cls_conn *conn;
1259
1260 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1261 if (!conn)
1262 return -EINVAL;
1263
1264 if (transport->destroy_conn)
1265 transport->destroy_conn(conn);
1266 return 0;
1267 }
1268
1269 static int
1270 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1271 {
1272 char *data = (char*)ev + sizeof(*ev);
1273 struct iscsi_cls_conn *conn;
1274 struct iscsi_cls_session *session;
1275 int err = 0, value = 0;
1276
1277 session = iscsi_session_lookup(ev->u.set_param.sid);
1278 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1279 if (!conn || !session)
1280 return -EINVAL;
1281
1282 switch (ev->u.set_param.param) {
1283 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1284 sscanf(data, "%d", &value);
1285 if (value != 0)
1286 session->recovery_tmo = value;
1287 break;
1288 default:
1289 err = transport->set_param(conn, ev->u.set_param.param,
1290 data, ev->u.set_param.len);
1291 }
1292
1293 return err;
1294 }
1295
1296 static int
1297 iscsi_if_transport_ep(struct iscsi_transport *transport,
1298 struct iscsi_uevent *ev, int msg_type)
1299 {
1300 struct iscsi_endpoint *ep;
1301 struct sockaddr *dst_addr;
1302 int rc = 0;
1303
1304 switch (msg_type) {
1305 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1306 if (!transport->ep_connect)
1307 return -EINVAL;
1308
1309 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1310 ep = transport->ep_connect(dst_addr,
1311 ev->u.ep_connect.non_blocking);
1312 if (IS_ERR(ep))
1313 return PTR_ERR(ep);
1314
1315 ev->r.ep_connect_ret.handle = ep->id;
1316 break;
1317 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1318 if (!transport->ep_poll)
1319 return -EINVAL;
1320
1321 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1322 if (!ep)
1323 return -EINVAL;
1324
1325 ev->r.retcode = transport->ep_poll(ep,
1326 ev->u.ep_poll.timeout_ms);
1327 break;
1328 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1329 if (!transport->ep_disconnect)
1330 return -EINVAL;
1331
1332 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1333 if (!ep)
1334 return -EINVAL;
1335
1336 transport->ep_disconnect(ep);
1337 break;
1338 }
1339 return rc;
1340 }
1341
1342 static int
1343 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1344 struct iscsi_uevent *ev)
1345 {
1346 struct Scsi_Host *shost;
1347 struct sockaddr *dst_addr;
1348 int err;
1349
1350 if (!transport->tgt_dscvr)
1351 return -EINVAL;
1352
1353 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1354 if (!shost) {
1355 printk(KERN_ERR "target discovery could not find host no %u\n",
1356 ev->u.tgt_dscvr.host_no);
1357 return -ENODEV;
1358 }
1359
1360
1361 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1362 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1363 ev->u.tgt_dscvr.enable, dst_addr);
1364 scsi_host_put(shost);
1365 return err;
1366 }
1367
1368 static int
1369 iscsi_set_host_param(struct iscsi_transport *transport,
1370 struct iscsi_uevent *ev)
1371 {
1372 char *data = (char*)ev + sizeof(*ev);
1373 struct Scsi_Host *shost;
1374 int err;
1375
1376 if (!transport->set_host_param)
1377 return -ENOSYS;
1378
1379 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1380 if (!shost) {
1381 printk(KERN_ERR "set_host_param could not find host no %u\n",
1382 ev->u.set_host_param.host_no);
1383 return -ENODEV;
1384 }
1385
1386 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1387 data, ev->u.set_host_param.len);
1388 scsi_host_put(shost);
1389 return err;
1390 }
1391
1392 static int
1393 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1394 {
1395 int err = 0;
1396 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1397 struct iscsi_transport *transport = NULL;
1398 struct iscsi_internal *priv;
1399 struct iscsi_cls_session *session;
1400 struct iscsi_cls_conn *conn;
1401 struct iscsi_endpoint *ep = NULL;
1402
1403 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1404 if (!priv)
1405 return -EINVAL;
1406 transport = priv->iscsi_transport;
1407
1408 if (!try_module_get(transport->owner))
1409 return -EINVAL;
1410
1411 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1412
1413 switch (nlh->nlmsg_type) {
1414 case ISCSI_UEVENT_CREATE_SESSION:
1415 err = iscsi_if_create_session(priv, ep, ev,
1416 ev->u.c_session.initial_cmdsn,
1417 ev->u.c_session.cmds_max,
1418 ev->u.c_session.queue_depth);
1419 break;
1420 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1421 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1422 if (!ep) {
1423 err = -EINVAL;
1424 break;
1425 }
1426
1427 err = iscsi_if_create_session(priv, ep, ev,
1428 ev->u.c_bound_session.initial_cmdsn,
1429 ev->u.c_bound_session.cmds_max,
1430 ev->u.c_bound_session.queue_depth);
1431 break;
1432 case ISCSI_UEVENT_DESTROY_SESSION:
1433 session = iscsi_session_lookup(ev->u.d_session.sid);
1434 if (session)
1435 transport->destroy_session(session);
1436 else
1437 err = -EINVAL;
1438 break;
1439 case ISCSI_UEVENT_UNBIND_SESSION:
1440 session = iscsi_session_lookup(ev->u.d_session.sid);
1441 if (session)
1442 iscsi_unbind_session(session);
1443 else
1444 err = -EINVAL;
1445 break;
1446 case ISCSI_UEVENT_CREATE_CONN:
1447 err = iscsi_if_create_conn(transport, ev);
1448 break;
1449 case ISCSI_UEVENT_DESTROY_CONN:
1450 err = iscsi_if_destroy_conn(transport, ev);
1451 break;
1452 case ISCSI_UEVENT_BIND_CONN:
1453 session = iscsi_session_lookup(ev->u.b_conn.sid);
1454 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1455
1456 if (session && conn)
1457 ev->r.retcode = transport->bind_conn(session, conn,
1458 ev->u.b_conn.transport_eph,
1459 ev->u.b_conn.is_leading);
1460 else
1461 err = -EINVAL;
1462 break;
1463 case ISCSI_UEVENT_SET_PARAM:
1464 err = iscsi_set_param(transport, ev);
1465 break;
1466 case ISCSI_UEVENT_START_CONN:
1467 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1468 if (conn)
1469 ev->r.retcode = transport->start_conn(conn);
1470 else
1471 err = -EINVAL;
1472 break;
1473 case ISCSI_UEVENT_STOP_CONN:
1474 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1475 if (conn)
1476 transport->stop_conn(conn, ev->u.stop_conn.flag);
1477 else
1478 err = -EINVAL;
1479 break;
1480 case ISCSI_UEVENT_SEND_PDU:
1481 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1482 if (conn)
1483 ev->r.retcode = transport->send_pdu(conn,
1484 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1485 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1486 ev->u.send_pdu.data_size);
1487 else
1488 err = -EINVAL;
1489 break;
1490 case ISCSI_UEVENT_GET_STATS:
1491 err = iscsi_if_get_stats(transport, nlh);
1492 break;
1493 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1494 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1495 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1496 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1497 break;
1498 case ISCSI_UEVENT_TGT_DSCVR:
1499 err = iscsi_tgt_dscvr(transport, ev);
1500 break;
1501 case ISCSI_UEVENT_SET_HOST_PARAM:
1502 err = iscsi_set_host_param(transport, ev);
1503 break;
1504 default:
1505 err = -ENOSYS;
1506 break;
1507 }
1508
1509 module_put(transport->owner);
1510 return err;
1511 }
1512
1513 /*
1514 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1515 * Malformed skbs with wrong lengths or invalid creds are not processed.
1516 */
1517 static void
1518 iscsi_if_rx(struct sk_buff *skb)
1519 {
1520 mutex_lock(&rx_queue_mutex);
1521 while (skb->len >= NLMSG_SPACE(0)) {
1522 int err;
1523 uint32_t rlen;
1524 struct nlmsghdr *nlh;
1525 struct iscsi_uevent *ev;
1526
1527 nlh = nlmsg_hdr(skb);
1528 if (nlh->nlmsg_len < sizeof(*nlh) ||
1529 skb->len < nlh->nlmsg_len) {
1530 break;
1531 }
1532
1533 ev = NLMSG_DATA(nlh);
1534 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1535 if (rlen > skb->len)
1536 rlen = skb->len;
1537
1538 err = iscsi_if_recv_msg(skb, nlh);
1539 if (err) {
1540 ev->type = ISCSI_KEVENT_IF_ERROR;
1541 ev->iferror = err;
1542 }
1543 do {
1544 /*
1545 * special case for GET_STATS:
1546 * on success - sending reply and stats from
1547 * inside of if_recv_msg(),
1548 * on error - fall through.
1549 */
1550 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1551 break;
1552 err = iscsi_if_send_reply(
1553 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1554 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1555 } while (err < 0 && err != -ECONNREFUSED);
1556 skb_pull(skb, rlen);
1557 }
1558 mutex_unlock(&rx_queue_mutex);
1559 }
1560
1561 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1562 struct device_attribute dev_attr_##_prefix##_##_name = \
1563 __ATTR(_name,_mode,_show,_store)
1564
1565 /*
1566 * iSCSI connection attrs
1567 */
1568 #define iscsi_conn_attr_show(param) \
1569 static ssize_t \
1570 show_conn_param_##param(struct device *dev, \
1571 struct device_attribute *attr, char *buf) \
1572 { \
1573 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1574 struct iscsi_transport *t = conn->transport; \
1575 return t->get_conn_param(conn, param, buf); \
1576 }
1577
1578 #define iscsi_conn_attr(field, param) \
1579 iscsi_conn_attr_show(param) \
1580 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1581 NULL);
1582
1583 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1584 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1585 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1586 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1587 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1588 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1589 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1590 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1591 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1592 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1593 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1594 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1595 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1596
1597 /*
1598 * iSCSI session attrs
1599 */
1600 #define iscsi_session_attr_show(param, perm) \
1601 static ssize_t \
1602 show_session_param_##param(struct device *dev, \
1603 struct device_attribute *attr, char *buf) \
1604 { \
1605 struct iscsi_cls_session *session = \
1606 iscsi_dev_to_session(dev->parent); \
1607 struct iscsi_transport *t = session->transport; \
1608 \
1609 if (perm && !capable(CAP_SYS_ADMIN)) \
1610 return -EACCES; \
1611 return t->get_session_param(session, param, buf); \
1612 }
1613
1614 #define iscsi_session_attr(field, param, perm) \
1615 iscsi_session_attr_show(param, perm) \
1616 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1617 NULL);
1618
1619 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1620 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1621 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1622 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1623 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1624 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1625 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1626 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1627 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1628 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1629 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1630 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1631 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1632 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1633 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1634 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1635 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1636 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1637 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1638
1639 static ssize_t
1640 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1641 char *buf)
1642 {
1643 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1644 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1645 }
1646 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1647 NULL);
1648
1649 #define iscsi_priv_session_attr_show(field, format) \
1650 static ssize_t \
1651 show_priv_session_##field(struct device *dev, \
1652 struct device_attribute *attr, char *buf) \
1653 { \
1654 struct iscsi_cls_session *session = \
1655 iscsi_dev_to_session(dev->parent); \
1656 return sprintf(buf, format"\n", session->field); \
1657 }
1658
1659 #define iscsi_priv_session_attr(field, format) \
1660 iscsi_priv_session_attr_show(field, format) \
1661 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1662 NULL)
1663 iscsi_priv_session_attr(recovery_tmo, "%d");
1664
1665 /*
1666 * iSCSI host attrs
1667 */
1668 #define iscsi_host_attr_show(param) \
1669 static ssize_t \
1670 show_host_param_##param(struct device *dev, \
1671 struct device_attribute *attr, char *buf) \
1672 { \
1673 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1674 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1675 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1676 }
1677
1678 #define iscsi_host_attr(field, param) \
1679 iscsi_host_attr_show(param) \
1680 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1681 NULL);
1682
1683 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1684 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1685 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1686 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1687
1688 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1689 do { \
1690 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1691 count++; \
1692 } while (0)
1693
1694
1695 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1696 do { \
1697 if (tt->param_mask & param_flag) { \
1698 priv->session_attrs[count] = &dev_attr_sess_##field; \
1699 count++; \
1700 } \
1701 } while (0)
1702
1703 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1704 do { \
1705 if (tt->param_mask & param_flag) { \
1706 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1707 count++; \
1708 } \
1709 } while (0)
1710
1711 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1712 do { \
1713 if (tt->host_param_mask & param_flag) { \
1714 priv->host_attrs[count] = &dev_attr_host_##field; \
1715 count++; \
1716 } \
1717 } while (0)
1718
1719 static int iscsi_session_match(struct attribute_container *cont,
1720 struct device *dev)
1721 {
1722 struct iscsi_cls_session *session;
1723 struct Scsi_Host *shost;
1724 struct iscsi_internal *priv;
1725
1726 if (!iscsi_is_session_dev(dev))
1727 return 0;
1728
1729 session = iscsi_dev_to_session(dev);
1730 shost = iscsi_session_to_shost(session);
1731 if (!shost->transportt)
1732 return 0;
1733
1734 priv = to_iscsi_internal(shost->transportt);
1735 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1736 return 0;
1737
1738 return &priv->session_cont.ac == cont;
1739 }
1740
1741 static int iscsi_conn_match(struct attribute_container *cont,
1742 struct device *dev)
1743 {
1744 struct iscsi_cls_session *session;
1745 struct iscsi_cls_conn *conn;
1746 struct Scsi_Host *shost;
1747 struct iscsi_internal *priv;
1748
1749 if (!iscsi_is_conn_dev(dev))
1750 return 0;
1751
1752 conn = iscsi_dev_to_conn(dev);
1753 session = iscsi_dev_to_session(conn->dev.parent);
1754 shost = iscsi_session_to_shost(session);
1755
1756 if (!shost->transportt)
1757 return 0;
1758
1759 priv = to_iscsi_internal(shost->transportt);
1760 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1761 return 0;
1762
1763 return &priv->conn_cont.ac == cont;
1764 }
1765
1766 static int iscsi_host_match(struct attribute_container *cont,
1767 struct device *dev)
1768 {
1769 struct Scsi_Host *shost;
1770 struct iscsi_internal *priv;
1771
1772 if (!scsi_is_host_device(dev))
1773 return 0;
1774
1775 shost = dev_to_shost(dev);
1776 if (!shost->transportt ||
1777 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1778 return 0;
1779
1780 priv = to_iscsi_internal(shost->transportt);
1781 return &priv->t.host_attrs.ac == cont;
1782 }
1783
1784 struct scsi_transport_template *
1785 iscsi_register_transport(struct iscsi_transport *tt)
1786 {
1787 struct iscsi_internal *priv;
1788 unsigned long flags;
1789 int count = 0, err;
1790
1791 BUG_ON(!tt);
1792
1793 priv = iscsi_if_transport_lookup(tt);
1794 if (priv)
1795 return NULL;
1796
1797 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1798 if (!priv)
1799 return NULL;
1800 INIT_LIST_HEAD(&priv->list);
1801 priv->daemon_pid = -1;
1802 priv->iscsi_transport = tt;
1803 priv->t.user_scan = iscsi_user_scan;
1804 if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
1805 priv->t.create_work_queue = 1;
1806
1807 priv->dev.class = &iscsi_transport_class;
1808 dev_set_name(&priv->dev, "%s", tt->name);
1809 err = device_register(&priv->dev);
1810 if (err)
1811 goto free_priv;
1812
1813 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1814 if (err)
1815 goto unregister_dev;
1816
1817 /* host parameters */
1818 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1819 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1820 priv->t.host_attrs.ac.match = iscsi_host_match;
1821 priv->t.host_size = sizeof(struct iscsi_cls_host);
1822 transport_container_register(&priv->t.host_attrs);
1823
1824 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1825 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1826 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1827 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1828 BUG_ON(count > ISCSI_HOST_ATTRS);
1829 priv->host_attrs[count] = NULL;
1830 count = 0;
1831
1832 /* connection parameters */
1833 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1834 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1835 priv->conn_cont.ac.match = iscsi_conn_match;
1836 transport_container_register(&priv->conn_cont);
1837
1838 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1839 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1840 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1841 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1842 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1843 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1844 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1845 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1846 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1847 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1848 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1849 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1850 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1851
1852 BUG_ON(count > ISCSI_CONN_ATTRS);
1853 priv->conn_attrs[count] = NULL;
1854 count = 0;
1855
1856 /* session parameters */
1857 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1858 priv->session_cont.ac.class = &iscsi_session_class.class;
1859 priv->session_cont.ac.match = iscsi_session_match;
1860 transport_container_register(&priv->session_cont);
1861
1862 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1863 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1864 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1865 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1866 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1867 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1868 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1869 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1870 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1871 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1872 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1873 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1874 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1875 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1876 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1877 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1878 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1879 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1880 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
1881 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1882 SETUP_PRIV_SESSION_RD_ATTR(state);
1883
1884 BUG_ON(count > ISCSI_SESSION_ATTRS);
1885 priv->session_attrs[count] = NULL;
1886
1887 spin_lock_irqsave(&iscsi_transport_lock, flags);
1888 list_add(&priv->list, &iscsi_transports);
1889 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1890
1891 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1892 return &priv->t;
1893
1894 unregister_dev:
1895 device_unregister(&priv->dev);
1896 return NULL;
1897 free_priv:
1898 kfree(priv);
1899 return NULL;
1900 }
1901 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1902
1903 int iscsi_unregister_transport(struct iscsi_transport *tt)
1904 {
1905 struct iscsi_internal *priv;
1906 unsigned long flags;
1907
1908 BUG_ON(!tt);
1909
1910 mutex_lock(&rx_queue_mutex);
1911
1912 priv = iscsi_if_transport_lookup(tt);
1913 BUG_ON (!priv);
1914
1915 spin_lock_irqsave(&iscsi_transport_lock, flags);
1916 list_del(&priv->list);
1917 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1918
1919 transport_container_unregister(&priv->conn_cont);
1920 transport_container_unregister(&priv->session_cont);
1921 transport_container_unregister(&priv->t.host_attrs);
1922
1923 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1924 device_unregister(&priv->dev);
1925 mutex_unlock(&rx_queue_mutex);
1926
1927 return 0;
1928 }
1929 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1930
1931 static __init int iscsi_transport_init(void)
1932 {
1933 int err;
1934
1935 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1936 ISCSI_TRANSPORT_VERSION);
1937
1938 atomic_set(&iscsi_session_nr, 0);
1939
1940 err = class_register(&iscsi_transport_class);
1941 if (err)
1942 return err;
1943
1944 err = class_register(&iscsi_endpoint_class);
1945 if (err)
1946 goto unregister_transport_class;
1947
1948 err = transport_class_register(&iscsi_host_class);
1949 if (err)
1950 goto unregister_endpoint_class;
1951
1952 err = transport_class_register(&iscsi_connection_class);
1953 if (err)
1954 goto unregister_host_class;
1955
1956 err = transport_class_register(&iscsi_session_class);
1957 if (err)
1958 goto unregister_conn_class;
1959
1960 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1961 NULL, THIS_MODULE);
1962 if (!nls) {
1963 err = -ENOBUFS;
1964 goto unregister_session_class;
1965 }
1966
1967 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1968 if (!iscsi_eh_timer_workq)
1969 goto release_nls;
1970
1971 return 0;
1972
1973 release_nls:
1974 netlink_kernel_release(nls);
1975 unregister_session_class:
1976 transport_class_unregister(&iscsi_session_class);
1977 unregister_conn_class:
1978 transport_class_unregister(&iscsi_connection_class);
1979 unregister_host_class:
1980 transport_class_unregister(&iscsi_host_class);
1981 unregister_endpoint_class:
1982 class_unregister(&iscsi_endpoint_class);
1983 unregister_transport_class:
1984 class_unregister(&iscsi_transport_class);
1985 return err;
1986 }
1987
1988 static void __exit iscsi_transport_exit(void)
1989 {
1990 destroy_workqueue(iscsi_eh_timer_workq);
1991 netlink_kernel_release(nls);
1992 transport_class_unregister(&iscsi_connection_class);
1993 transport_class_unregister(&iscsi_session_class);
1994 transport_class_unregister(&iscsi_host_class);
1995 class_unregister(&iscsi_endpoint_class);
1996 class_unregister(&iscsi_transport_class);
1997 }
1998
1999 module_init(iscsi_transport_init);
2000 module_exit(iscsi_transport_exit);
2001
2002 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2003 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2004 "Alex Aizman <itn780@yahoo.com>");
2005 MODULE_DESCRIPTION("iSCSI Transport Interface");
2006 MODULE_LICENSE("GPL");
2007 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
x86 "subsystem" repository