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ASoC: Blackfin: drop unnecessary dma casts
[linux-2.6/mini2440.git] / drivers / scsi / scsi_transport_iscsi.c
blob75c9297694cbf7e8b262095bbe41a25263935bf3
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 int rc;
970
971 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
972 if (rc < 0) {
973 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
974 return rc;
975 }
976
977 return 0;
978 }
979
980 static int
981 iscsi_unicast_skb(struct sk_buff *skb, int pid)
982 {
983 int rc;
984
985 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
986 if (rc < 0) {
987 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
988 return rc;
989 }
990
991 return 0;
992 }
993
994 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
995 char *data, uint32_t data_size)
996 {
997 struct nlmsghdr *nlh;
998 struct sk_buff *skb;
999 struct iscsi_uevent *ev;
1000 char *pdu;
1001 struct iscsi_internal *priv;
1002 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1003 data_size);
1004
1005 priv = iscsi_if_transport_lookup(conn->transport);
1006 if (!priv)
1007 return -EINVAL;
1008
1009 skb = alloc_skb(len, GFP_ATOMIC);
1010 if (!skb) {
1011 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1012 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1013 "control PDU: OOM\n");
1014 return -ENOMEM;
1015 }
1016
1017 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1018 ev = NLMSG_DATA(nlh);
1019 memset(ev, 0, sizeof(*ev));
1020 ev->transport_handle = iscsi_handle(conn->transport);
1021 ev->type = ISCSI_KEVENT_RECV_PDU;
1022 ev->r.recv_req.cid = conn->cid;
1023 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1024 pdu = (char*)ev + sizeof(*ev);
1025 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1026 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1027
1028 return iscsi_unicast_skb(skb, priv->daemon_pid);
1029 }
1030 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1031
1032 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1033 {
1034 struct nlmsghdr *nlh;
1035 struct sk_buff *skb;
1036 struct iscsi_uevent *ev;
1037 struct iscsi_internal *priv;
1038 int len = NLMSG_SPACE(sizeof(*ev));
1039
1040 priv = iscsi_if_transport_lookup(conn->transport);
1041 if (!priv)
1042 return;
1043
1044 skb = alloc_skb(len, GFP_ATOMIC);
1045 if (!skb) {
1046 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1047 "conn error (%d)\n", error);
1048 return;
1049 }
1050
1051 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1052 ev = NLMSG_DATA(nlh);
1053 ev->transport_handle = iscsi_handle(conn->transport);
1054 ev->type = ISCSI_KEVENT_CONN_ERROR;
1055 ev->r.connerror.error = error;
1056 ev->r.connerror.cid = conn->cid;
1057 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1058
1059 iscsi_broadcast_skb(skb, GFP_ATOMIC);
1060
1061 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1062 error);
1063 }
1064 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1065
1066 static int
1067 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1068 void *payload, int size)
1069 {
1070 struct sk_buff *skb;
1071 struct nlmsghdr *nlh;
1072 int len = NLMSG_SPACE(size);
1073 int flags = multi ? NLM_F_MULTI : 0;
1074 int t = done ? NLMSG_DONE : type;
1075
1076 skb = alloc_skb(len, GFP_ATOMIC);
1077 if (!skb) {
1078 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1079 return -ENOMEM;
1080 }
1081
1082 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1083 nlh->nlmsg_flags = flags;
1084 memcpy(NLMSG_DATA(nlh), payload, size);
1085 return iscsi_unicast_skb(skb, pid);
1086 }
1087
1088 static int
1089 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1090 {
1091 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1092 struct iscsi_stats *stats;
1093 struct sk_buff *skbstat;
1094 struct iscsi_cls_conn *conn;
1095 struct nlmsghdr *nlhstat;
1096 struct iscsi_uevent *evstat;
1097 struct iscsi_internal *priv;
1098 int len = NLMSG_SPACE(sizeof(*ev) +
1099 sizeof(struct iscsi_stats) +
1100 sizeof(struct iscsi_stats_custom) *
1101 ISCSI_STATS_CUSTOM_MAX);
1102 int err = 0;
1103
1104 priv = iscsi_if_transport_lookup(transport);
1105 if (!priv)
1106 return -EINVAL;
1107
1108 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1109 if (!conn)
1110 return -EEXIST;
1111
1112 do {
1113 int actual_size;
1114
1115 skbstat = alloc_skb(len, GFP_ATOMIC);
1116 if (!skbstat) {
1117 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1118 "deliver stats: OOM\n");
1119 return -ENOMEM;
1120 }
1121
1122 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
1123 (len - sizeof(*nlhstat)), 0);
1124 evstat = NLMSG_DATA(nlhstat);
1125 memset(evstat, 0, sizeof(*evstat));
1126 evstat->transport_handle = iscsi_handle(conn->transport);
1127 evstat->type = nlh->nlmsg_type;
1128 evstat->u.get_stats.cid =
1129 ev->u.get_stats.cid;
1130 evstat->u.get_stats.sid =
1131 ev->u.get_stats.sid;
1132 stats = (struct iscsi_stats *)
1133 ((char*)evstat + sizeof(*evstat));
1134 memset(stats, 0, sizeof(*stats));
1135
1136 transport->get_stats(conn, stats);
1137 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1138 sizeof(struct iscsi_stats) +
1139 sizeof(struct iscsi_stats_custom) *
1140 stats->custom_length);
1141 actual_size -= sizeof(*nlhstat);
1142 actual_size = NLMSG_LENGTH(actual_size);
1143 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1144 nlhstat->nlmsg_len = actual_size;
1145
1146 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
1147 } while (err < 0 && err != -ECONNREFUSED);
1148
1149 return err;
1150 }
1151
1152 /**
1153 * iscsi_session_event - send session destr. completion event
1154 * @session: iscsi class session
1155 * @event: type of event
1156 */
1157 int iscsi_session_event(struct iscsi_cls_session *session,
1158 enum iscsi_uevent_e event)
1159 {
1160 struct iscsi_internal *priv;
1161 struct Scsi_Host *shost;
1162 struct iscsi_uevent *ev;
1163 struct sk_buff *skb;
1164 struct nlmsghdr *nlh;
1165 int rc, len = NLMSG_SPACE(sizeof(*ev));
1166
1167 priv = iscsi_if_transport_lookup(session->transport);
1168 if (!priv)
1169 return -EINVAL;
1170 shost = iscsi_session_to_shost(session);
1171
1172 skb = alloc_skb(len, GFP_KERNEL);
1173 if (!skb) {
1174 iscsi_cls_session_printk(KERN_ERR, session,
1175 "Cannot notify userspace of session "
1176 "event %u\n", event);
1177 return -ENOMEM;
1178 }
1179
1180 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1181 ev = NLMSG_DATA(nlh);
1182 ev->transport_handle = iscsi_handle(session->transport);
1183
1184 ev->type = event;
1185 switch (event) {
1186 case ISCSI_KEVENT_DESTROY_SESSION:
1187 ev->r.d_session.host_no = shost->host_no;
1188 ev->r.d_session.sid = session->sid;
1189 break;
1190 case ISCSI_KEVENT_CREATE_SESSION:
1191 ev->r.c_session_ret.host_no = shost->host_no;
1192 ev->r.c_session_ret.sid = session->sid;
1193 break;
1194 case ISCSI_KEVENT_UNBIND_SESSION:
1195 ev->r.unbind_session.host_no = shost->host_no;
1196 ev->r.unbind_session.sid = session->sid;
1197 break;
1198 default:
1199 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1200 "%u.\n", event);
1201 kfree_skb(skb);
1202 return -EINVAL;
1203 }
1204
1205 /*
1206 * this will occur if the daemon is not up, so we just warn
1207 * the user and when the daemon is restarted it will handle it
1208 */
1209 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1210 if (rc < 0)
1211 iscsi_cls_session_printk(KERN_ERR, session,
1212 "Cannot notify userspace of session "
1213 "event %u. Check iscsi daemon\n",
1214 event);
1215 return rc;
1216 }
1217 EXPORT_SYMBOL_GPL(iscsi_session_event);
1218
1219 static int
1220 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1221 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1222 uint16_t cmds_max, uint16_t queue_depth)
1223 {
1224 struct iscsi_transport *transport = priv->iscsi_transport;
1225 struct iscsi_cls_session *session;
1226 uint32_t host_no;
1227
1228 session = transport->create_session(ep, cmds_max, queue_depth,
1229 initial_cmdsn, &host_no);
1230 if (!session)
1231 return -ENOMEM;
1232
1233 ev->r.c_session_ret.host_no = host_no;
1234 ev->r.c_session_ret.sid = session->sid;
1235 return 0;
1236 }
1237
1238 static int
1239 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1240 {
1241 struct iscsi_cls_conn *conn;
1242 struct iscsi_cls_session *session;
1243
1244 session = iscsi_session_lookup(ev->u.c_conn.sid);
1245 if (!session) {
1246 printk(KERN_ERR "iscsi: invalid session %d.\n",
1247 ev->u.c_conn.sid);
1248 return -EINVAL;
1249 }
1250
1251 conn = transport->create_conn(session, ev->u.c_conn.cid);
1252 if (!conn) {
1253 iscsi_cls_session_printk(KERN_ERR, session,
1254 "couldn't create a new connection.");
1255 return -ENOMEM;
1256 }
1257
1258 ev->r.c_conn_ret.sid = session->sid;
1259 ev->r.c_conn_ret.cid = conn->cid;
1260 return 0;
1261 }
1262
1263 static int
1264 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1265 {
1266 struct iscsi_cls_conn *conn;
1267
1268 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1269 if (!conn)
1270 return -EINVAL;
1271
1272 if (transport->destroy_conn)
1273 transport->destroy_conn(conn);
1274 return 0;
1275 }
1276
1277 static int
1278 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1279 {
1280 char *data = (char*)ev + sizeof(*ev);
1281 struct iscsi_cls_conn *conn;
1282 struct iscsi_cls_session *session;
1283 int err = 0, value = 0;
1284
1285 session = iscsi_session_lookup(ev->u.set_param.sid);
1286 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1287 if (!conn || !session)
1288 return -EINVAL;
1289
1290 switch (ev->u.set_param.param) {
1291 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1292 sscanf(data, "%d", &value);
1293 if (value != 0)
1294 session->recovery_tmo = value;
1295 break;
1296 default:
1297 err = transport->set_param(conn, ev->u.set_param.param,
1298 data, ev->u.set_param.len);
1299 }
1300
1301 return err;
1302 }
1303
1304 static int
1305 iscsi_if_transport_ep(struct iscsi_transport *transport,
1306 struct iscsi_uevent *ev, int msg_type)
1307 {
1308 struct iscsi_endpoint *ep;
1309 struct sockaddr *dst_addr;
1310 int rc = 0;
1311
1312 switch (msg_type) {
1313 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1314 if (!transport->ep_connect)
1315 return -EINVAL;
1316
1317 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1318 ep = transport->ep_connect(dst_addr,
1319 ev->u.ep_connect.non_blocking);
1320 if (IS_ERR(ep))
1321 return PTR_ERR(ep);
1322
1323 ev->r.ep_connect_ret.handle = ep->id;
1324 break;
1325 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1326 if (!transport->ep_poll)
1327 return -EINVAL;
1328
1329 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1330 if (!ep)
1331 return -EINVAL;
1332
1333 ev->r.retcode = transport->ep_poll(ep,
1334 ev->u.ep_poll.timeout_ms);
1335 break;
1336 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1337 if (!transport->ep_disconnect)
1338 return -EINVAL;
1339
1340 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1341 if (!ep)
1342 return -EINVAL;
1343
1344 transport->ep_disconnect(ep);
1345 break;
1346 }
1347 return rc;
1348 }
1349
1350 static int
1351 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1352 struct iscsi_uevent *ev)
1353 {
1354 struct Scsi_Host *shost;
1355 struct sockaddr *dst_addr;
1356 int err;
1357
1358 if (!transport->tgt_dscvr)
1359 return -EINVAL;
1360
1361 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1362 if (!shost) {
1363 printk(KERN_ERR "target discovery could not find host no %u\n",
1364 ev->u.tgt_dscvr.host_no);
1365 return -ENODEV;
1366 }
1367
1368
1369 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1370 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1371 ev->u.tgt_dscvr.enable, dst_addr);
1372 scsi_host_put(shost);
1373 return err;
1374 }
1375
1376 static int
1377 iscsi_set_host_param(struct iscsi_transport *transport,
1378 struct iscsi_uevent *ev)
1379 {
1380 char *data = (char*)ev + sizeof(*ev);
1381 struct Scsi_Host *shost;
1382 int err;
1383
1384 if (!transport->set_host_param)
1385 return -ENOSYS;
1386
1387 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1388 if (!shost) {
1389 printk(KERN_ERR "set_host_param could not find host no %u\n",
1390 ev->u.set_host_param.host_no);
1391 return -ENODEV;
1392 }
1393
1394 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1395 data, ev->u.set_host_param.len);
1396 scsi_host_put(shost);
1397 return err;
1398 }
1399
1400 static int
1401 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1402 {
1403 int err = 0;
1404 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1405 struct iscsi_transport *transport = NULL;
1406 struct iscsi_internal *priv;
1407 struct iscsi_cls_session *session;
1408 struct iscsi_cls_conn *conn;
1409 struct iscsi_endpoint *ep = NULL;
1410
1411 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1412 if (!priv)
1413 return -EINVAL;
1414 transport = priv->iscsi_transport;
1415
1416 if (!try_module_get(transport->owner))
1417 return -EINVAL;
1418
1419 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1420
1421 switch (nlh->nlmsg_type) {
1422 case ISCSI_UEVENT_CREATE_SESSION:
1423 err = iscsi_if_create_session(priv, ep, ev,
1424 ev->u.c_session.initial_cmdsn,
1425 ev->u.c_session.cmds_max,
1426 ev->u.c_session.queue_depth);
1427 break;
1428 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1429 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1430 if (!ep) {
1431 err = -EINVAL;
1432 break;
1433 }
1434
1435 err = iscsi_if_create_session(priv, ep, ev,
1436 ev->u.c_bound_session.initial_cmdsn,
1437 ev->u.c_bound_session.cmds_max,
1438 ev->u.c_bound_session.queue_depth);
1439 break;
1440 case ISCSI_UEVENT_DESTROY_SESSION:
1441 session = iscsi_session_lookup(ev->u.d_session.sid);
1442 if (session)
1443 transport->destroy_session(session);
1444 else
1445 err = -EINVAL;
1446 break;
1447 case ISCSI_UEVENT_UNBIND_SESSION:
1448 session = iscsi_session_lookup(ev->u.d_session.sid);
1449 if (session)
1450 iscsi_unbind_session(session);
1451 else
1452 err = -EINVAL;
1453 break;
1454 case ISCSI_UEVENT_CREATE_CONN:
1455 err = iscsi_if_create_conn(transport, ev);
1456 break;
1457 case ISCSI_UEVENT_DESTROY_CONN:
1458 err = iscsi_if_destroy_conn(transport, ev);
1459 break;
1460 case ISCSI_UEVENT_BIND_CONN:
1461 session = iscsi_session_lookup(ev->u.b_conn.sid);
1462 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1463
1464 if (session && conn)
1465 ev->r.retcode = transport->bind_conn(session, conn,
1466 ev->u.b_conn.transport_eph,
1467 ev->u.b_conn.is_leading);
1468 else
1469 err = -EINVAL;
1470 break;
1471 case ISCSI_UEVENT_SET_PARAM:
1472 err = iscsi_set_param(transport, ev);
1473 break;
1474 case ISCSI_UEVENT_START_CONN:
1475 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1476 if (conn)
1477 ev->r.retcode = transport->start_conn(conn);
1478 else
1479 err = -EINVAL;
1480 break;
1481 case ISCSI_UEVENT_STOP_CONN:
1482 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1483 if (conn)
1484 transport->stop_conn(conn, ev->u.stop_conn.flag);
1485 else
1486 err = -EINVAL;
1487 break;
1488 case ISCSI_UEVENT_SEND_PDU:
1489 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1490 if (conn)
1491 ev->r.retcode = transport->send_pdu(conn,
1492 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1493 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1494 ev->u.send_pdu.data_size);
1495 else
1496 err = -EINVAL;
1497 break;
1498 case ISCSI_UEVENT_GET_STATS:
1499 err = iscsi_if_get_stats(transport, nlh);
1500 break;
1501 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1502 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1503 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1504 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1505 break;
1506 case ISCSI_UEVENT_TGT_DSCVR:
1507 err = iscsi_tgt_dscvr(transport, ev);
1508 break;
1509 case ISCSI_UEVENT_SET_HOST_PARAM:
1510 err = iscsi_set_host_param(transport, ev);
1511 break;
1512 default:
1513 err = -ENOSYS;
1514 break;
1515 }
1516
1517 module_put(transport->owner);
1518 return err;
1519 }
1520
1521 /*
1522 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1523 * Malformed skbs with wrong lengths or invalid creds are not processed.
1524 */
1525 static void
1526 iscsi_if_rx(struct sk_buff *skb)
1527 {
1528 mutex_lock(&rx_queue_mutex);
1529 while (skb->len >= NLMSG_SPACE(0)) {
1530 int err;
1531 uint32_t rlen;
1532 struct nlmsghdr *nlh;
1533 struct iscsi_uevent *ev;
1534
1535 nlh = nlmsg_hdr(skb);
1536 if (nlh->nlmsg_len < sizeof(*nlh) ||
1537 skb->len < nlh->nlmsg_len) {
1538 break;
1539 }
1540
1541 ev = NLMSG_DATA(nlh);
1542 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1543 if (rlen > skb->len)
1544 rlen = skb->len;
1545
1546 err = iscsi_if_recv_msg(skb, nlh);
1547 if (err) {
1548 ev->type = ISCSI_KEVENT_IF_ERROR;
1549 ev->iferror = err;
1550 }
1551 do {
1552 /*
1553 * special case for GET_STATS:
1554 * on success - sending reply and stats from
1555 * inside of if_recv_msg(),
1556 * on error - fall through.
1557 */
1558 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1559 break;
1560 err = iscsi_if_send_reply(
1561 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1562 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1563 } while (err < 0 && err != -ECONNREFUSED);
1564 skb_pull(skb, rlen);
1565 }
1566 mutex_unlock(&rx_queue_mutex);
1567 }
1568
1569 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1570 struct device_attribute dev_attr_##_prefix##_##_name = \
1571 __ATTR(_name,_mode,_show,_store)
1572
1573 /*
1574 * iSCSI connection attrs
1575 */
1576 #define iscsi_conn_attr_show(param) \
1577 static ssize_t \
1578 show_conn_param_##param(struct device *dev, \
1579 struct device_attribute *attr, char *buf) \
1580 { \
1581 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1582 struct iscsi_transport *t = conn->transport; \
1583 return t->get_conn_param(conn, param, buf); \
1584 }
1585
1586 #define iscsi_conn_attr(field, param) \
1587 iscsi_conn_attr_show(param) \
1588 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1589 NULL);
1590
1591 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1592 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1593 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1594 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1595 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1596 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1597 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1598 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1599 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1600 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1601 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1602 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1603 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1604
1605 /*
1606 * iSCSI session attrs
1607 */
1608 #define iscsi_session_attr_show(param, perm) \
1609 static ssize_t \
1610 show_session_param_##param(struct device *dev, \
1611 struct device_attribute *attr, char *buf) \
1612 { \
1613 struct iscsi_cls_session *session = \
1614 iscsi_dev_to_session(dev->parent); \
1615 struct iscsi_transport *t = session->transport; \
1616 \
1617 if (perm && !capable(CAP_SYS_ADMIN)) \
1618 return -EACCES; \
1619 return t->get_session_param(session, param, buf); \
1620 }
1621
1622 #define iscsi_session_attr(field, param, perm) \
1623 iscsi_session_attr_show(param, perm) \
1624 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1625 NULL);
1626
1627 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1628 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1629 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1630 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1631 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1632 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1633 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1634 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1635 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1636 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1637 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1638 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1639 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1640 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1641 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1642 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1643 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1644 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1645 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1646
1647 static ssize_t
1648 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1649 char *buf)
1650 {
1651 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1652 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1653 }
1654 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1655 NULL);
1656
1657 #define iscsi_priv_session_attr_show(field, format) \
1658 static ssize_t \
1659 show_priv_session_##field(struct device *dev, \
1660 struct device_attribute *attr, char *buf) \
1661 { \
1662 struct iscsi_cls_session *session = \
1663 iscsi_dev_to_session(dev->parent); \
1664 return sprintf(buf, format"\n", session->field); \
1665 }
1666
1667 #define iscsi_priv_session_attr(field, format) \
1668 iscsi_priv_session_attr_show(field, format) \
1669 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1670 NULL)
1671 iscsi_priv_session_attr(recovery_tmo, "%d");
1672
1673 /*
1674 * iSCSI host attrs
1675 */
1676 #define iscsi_host_attr_show(param) \
1677 static ssize_t \
1678 show_host_param_##param(struct device *dev, \
1679 struct device_attribute *attr, char *buf) \
1680 { \
1681 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1682 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1683 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1684 }
1685
1686 #define iscsi_host_attr(field, param) \
1687 iscsi_host_attr_show(param) \
1688 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1689 NULL);
1690
1691 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1692 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1693 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1694 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1695
1696 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1697 do { \
1698 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1699 count++; \
1700 } while (0)
1701
1702
1703 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1704 do { \
1705 if (tt->param_mask & param_flag) { \
1706 priv->session_attrs[count] = &dev_attr_sess_##field; \
1707 count++; \
1708 } \
1709 } while (0)
1710
1711 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1712 do { \
1713 if (tt->param_mask & param_flag) { \
1714 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1715 count++; \
1716 } \
1717 } while (0)
1718
1719 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1720 do { \
1721 if (tt->host_param_mask & param_flag) { \
1722 priv->host_attrs[count] = &dev_attr_host_##field; \
1723 count++; \
1724 } \
1725 } while (0)
1726
1727 static int iscsi_session_match(struct attribute_container *cont,
1728 struct device *dev)
1729 {
1730 struct iscsi_cls_session *session;
1731 struct Scsi_Host *shost;
1732 struct iscsi_internal *priv;
1733
1734 if (!iscsi_is_session_dev(dev))
1735 return 0;
1736
1737 session = iscsi_dev_to_session(dev);
1738 shost = iscsi_session_to_shost(session);
1739 if (!shost->transportt)
1740 return 0;
1741
1742 priv = to_iscsi_internal(shost->transportt);
1743 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1744 return 0;
1745
1746 return &priv->session_cont.ac == cont;
1747 }
1748
1749 static int iscsi_conn_match(struct attribute_container *cont,
1750 struct device *dev)
1751 {
1752 struct iscsi_cls_session *session;
1753 struct iscsi_cls_conn *conn;
1754 struct Scsi_Host *shost;
1755 struct iscsi_internal *priv;
1756
1757 if (!iscsi_is_conn_dev(dev))
1758 return 0;
1759
1760 conn = iscsi_dev_to_conn(dev);
1761 session = iscsi_dev_to_session(conn->dev.parent);
1762 shost = iscsi_session_to_shost(session);
1763
1764 if (!shost->transportt)
1765 return 0;
1766
1767 priv = to_iscsi_internal(shost->transportt);
1768 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1769 return 0;
1770
1771 return &priv->conn_cont.ac == cont;
1772 }
1773
1774 static int iscsi_host_match(struct attribute_container *cont,
1775 struct device *dev)
1776 {
1777 struct Scsi_Host *shost;
1778 struct iscsi_internal *priv;
1779
1780 if (!scsi_is_host_device(dev))
1781 return 0;
1782
1783 shost = dev_to_shost(dev);
1784 if (!shost->transportt ||
1785 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1786 return 0;
1787
1788 priv = to_iscsi_internal(shost->transportt);
1789 return &priv->t.host_attrs.ac == cont;
1790 }
1791
1792 struct scsi_transport_template *
1793 iscsi_register_transport(struct iscsi_transport *tt)
1794 {
1795 struct iscsi_internal *priv;
1796 unsigned long flags;
1797 int count = 0, err;
1798
1799 BUG_ON(!tt);
1800
1801 priv = iscsi_if_transport_lookup(tt);
1802 if (priv)
1803 return NULL;
1804
1805 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1806 if (!priv)
1807 return NULL;
1808 INIT_LIST_HEAD(&priv->list);
1809 priv->daemon_pid = -1;
1810 priv->iscsi_transport = tt;
1811 priv->t.user_scan = iscsi_user_scan;
1812 if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
1813 priv->t.create_work_queue = 1;
1814
1815 priv->dev.class = &iscsi_transport_class;
1816 dev_set_name(&priv->dev, "%s", tt->name);
1817 err = device_register(&priv->dev);
1818 if (err)
1819 goto free_priv;
1820
1821 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1822 if (err)
1823 goto unregister_dev;
1824
1825 /* host parameters */
1826 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1827 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1828 priv->t.host_attrs.ac.match = iscsi_host_match;
1829 priv->t.host_size = sizeof(struct iscsi_cls_host);
1830 transport_container_register(&priv->t.host_attrs);
1831
1832 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1833 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1834 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1835 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1836 BUG_ON(count > ISCSI_HOST_ATTRS);
1837 priv->host_attrs[count] = NULL;
1838 count = 0;
1839
1840 /* connection parameters */
1841 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1842 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1843 priv->conn_cont.ac.match = iscsi_conn_match;
1844 transport_container_register(&priv->conn_cont);
1845
1846 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1847 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1848 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1849 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1850 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1851 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1852 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1853 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1854 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1855 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1856 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1857 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1858 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1859
1860 BUG_ON(count > ISCSI_CONN_ATTRS);
1861 priv->conn_attrs[count] = NULL;
1862 count = 0;
1863
1864 /* session parameters */
1865 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1866 priv->session_cont.ac.class = &iscsi_session_class.class;
1867 priv->session_cont.ac.match = iscsi_session_match;
1868 transport_container_register(&priv->session_cont);
1869
1870 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1871 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1872 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1873 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1874 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1875 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1876 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1877 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1878 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1879 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1880 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1881 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1882 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1883 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1884 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1885 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1886 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1887 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1888 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
1889 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1890 SETUP_PRIV_SESSION_RD_ATTR(state);
1891
1892 BUG_ON(count > ISCSI_SESSION_ATTRS);
1893 priv->session_attrs[count] = NULL;
1894
1895 spin_lock_irqsave(&iscsi_transport_lock, flags);
1896 list_add(&priv->list, &iscsi_transports);
1897 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1898
1899 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1900 return &priv->t;
1901
1902 unregister_dev:
1903 device_unregister(&priv->dev);
1904 return NULL;
1905 free_priv:
1906 kfree(priv);
1907 return NULL;
1908 }
1909 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1910
1911 int iscsi_unregister_transport(struct iscsi_transport *tt)
1912 {
1913 struct iscsi_internal *priv;
1914 unsigned long flags;
1915
1916 BUG_ON(!tt);
1917
1918 mutex_lock(&rx_queue_mutex);
1919
1920 priv = iscsi_if_transport_lookup(tt);
1921 BUG_ON (!priv);
1922
1923 spin_lock_irqsave(&iscsi_transport_lock, flags);
1924 list_del(&priv->list);
1925 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1926
1927 transport_container_unregister(&priv->conn_cont);
1928 transport_container_unregister(&priv->session_cont);
1929 transport_container_unregister(&priv->t.host_attrs);
1930
1931 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1932 device_unregister(&priv->dev);
1933 mutex_unlock(&rx_queue_mutex);
1934
1935 return 0;
1936 }
1937 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1938
1939 static __init int iscsi_transport_init(void)
1940 {
1941 int err;
1942
1943 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1944 ISCSI_TRANSPORT_VERSION);
1945
1946 atomic_set(&iscsi_session_nr, 0);
1947
1948 err = class_register(&iscsi_transport_class);
1949 if (err)
1950 return err;
1951
1952 err = class_register(&iscsi_endpoint_class);
1953 if (err)
1954 goto unregister_transport_class;
1955
1956 err = transport_class_register(&iscsi_host_class);
1957 if (err)
1958 goto unregister_endpoint_class;
1959
1960 err = transport_class_register(&iscsi_connection_class);
1961 if (err)
1962 goto unregister_host_class;
1963
1964 err = transport_class_register(&iscsi_session_class);
1965 if (err)
1966 goto unregister_conn_class;
1967
1968 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1969 NULL, THIS_MODULE);
1970 if (!nls) {
1971 err = -ENOBUFS;
1972 goto unregister_session_class;
1973 }
1974
1975 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1976 if (!iscsi_eh_timer_workq)
1977 goto release_nls;
1978
1979 return 0;
1980
1981 release_nls:
1982 netlink_kernel_release(nls);
1983 unregister_session_class:
1984 transport_class_unregister(&iscsi_session_class);
1985 unregister_conn_class:
1986 transport_class_unregister(&iscsi_connection_class);
1987 unregister_host_class:
1988 transport_class_unregister(&iscsi_host_class);
1989 unregister_endpoint_class:
1990 class_unregister(&iscsi_endpoint_class);
1991 unregister_transport_class:
1992 class_unregister(&iscsi_transport_class);
1993 return err;
1994 }
1995
1996 static void __exit iscsi_transport_exit(void)
1997 {
1998 destroy_workqueue(iscsi_eh_timer_workq);
1999 netlink_kernel_release(nls);
2000 transport_class_unregister(&iscsi_connection_class);
2001 transport_class_unregister(&iscsi_session_class);
2002 transport_class_unregister(&iscsi_host_class);
2003 class_unregister(&iscsi_endpoint_class);
2004 class_unregister(&iscsi_transport_class);
2005 }
2006
2007 module_init(iscsi_transport_init);
2008 module_exit(iscsi_transport_exit);
2009
2010 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2011 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2012 "Alex Aizman <itn780@yahoo.com>");
2013 MODULE_DESCRIPTION("iSCSI Transport Interface");
2014 MODULE_LICENSE("GPL");
2015 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
Support for the Chinese Samsung S3C2440 based development boards