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writeback: Add tracing to balance_dirty_pages
[linux-2.6/next.git] / drivers / scsi / scsi_transport_iscsi.c
blob1e6d4793542c30943602fbc13a2abcbae82080b2
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 <linux/slab.h>
26 #include <net/tcp.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_iscsi.h>
32 #include <scsi/iscsi_if.h>
33
34 #define ISCSI_SESSION_ATTRS 22
35 #define ISCSI_CONN_ATTRS 13
36 #define ISCSI_HOST_ATTRS 4
37
38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
39
40 static int dbg_session;
41 module_param_named(debug_session, dbg_session, int,
42 S_IRUGO | S_IWUSR);
43 MODULE_PARM_DESC(debug_session,
44 "Turn on debugging for sessions in scsi_transport_iscsi "
45 "module. Set to 1 to turn on, and zero to turn off. Default "
46 "is off.");
47
48 static int dbg_conn;
49 module_param_named(debug_conn, dbg_conn, int,
50 S_IRUGO | S_IWUSR);
51 MODULE_PARM_DESC(debug_conn,
52 "Turn on debugging for connections in scsi_transport_iscsi "
53 "module. Set to 1 to turn on, and zero to turn off. Default "
54 "is off.");
55
56 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
57 do { \
58 if (dbg_session) \
59 iscsi_cls_session_printk(KERN_INFO, _session, \
60 "%s: " dbg_fmt, \
61 __func__, ##arg); \
62 } while (0);
63
64 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
65 do { \
66 if (dbg_conn) \
67 iscsi_cls_conn_printk(KERN_INFO, _conn, \
68 "%s: " dbg_fmt, \
69 __func__, ##arg); \
70 } while (0);
71
72 struct iscsi_internal {
73 struct scsi_transport_template t;
74 struct iscsi_transport *iscsi_transport;
75 struct list_head list;
76 struct device dev;
77
78 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
79 struct transport_container conn_cont;
80 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
81 struct transport_container session_cont;
82 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
83 };
84
85 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
86 static struct workqueue_struct *iscsi_eh_timer_workq;
87
88 /*
89 * list of registered transports and lock that must
90 * be held while accessing list. The iscsi_transport_lock must
91 * be acquired after the rx_queue_mutex.
92 */
93 static LIST_HEAD(iscsi_transports);
94 static DEFINE_SPINLOCK(iscsi_transport_lock);
95
96 #define to_iscsi_internal(tmpl) \
97 container_of(tmpl, struct iscsi_internal, t)
98
99 #define dev_to_iscsi_internal(_dev) \
100 container_of(_dev, struct iscsi_internal, dev)
101
102 static void iscsi_transport_release(struct device *dev)
103 {
104 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
105 kfree(priv);
106 }
107
108 /*
109 * iscsi_transport_class represents the iscsi_transports that are
110 * registered.
111 */
112 static struct class iscsi_transport_class = {
113 .name = "iscsi_transport",
114 .dev_release = iscsi_transport_release,
115 };
116
117 static ssize_t
118 show_transport_handle(struct device *dev, struct device_attribute *attr,
119 char *buf)
120 {
121 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
122 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
123 }
124 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
125
126 #define show_transport_attr(name, format) \
127 static ssize_t \
128 show_transport_##name(struct device *dev, \
129 struct device_attribute *attr,char *buf) \
130 { \
131 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
132 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
133 } \
134 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
135
136 show_transport_attr(caps, "0x%x");
137
138 static struct attribute *iscsi_transport_attrs[] = {
139 &dev_attr_handle.attr,
140 &dev_attr_caps.attr,
141 NULL,
142 };
143
144 static struct attribute_group iscsi_transport_group = {
145 .attrs = iscsi_transport_attrs,
146 };
147
148 /*
149 * iSCSI endpoint attrs
150 */
151 #define iscsi_dev_to_endpoint(_dev) \
152 container_of(_dev, struct iscsi_endpoint, dev)
153
154 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
155 struct device_attribute dev_attr_##_prefix##_##_name = \
156 __ATTR(_name,_mode,_show,_store)
157
158 static void iscsi_endpoint_release(struct device *dev)
159 {
160 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
161 kfree(ep);
162 }
163
164 static struct class iscsi_endpoint_class = {
165 .name = "iscsi_endpoint",
166 .dev_release = iscsi_endpoint_release,
167 };
168
169 static ssize_t
170 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
171 {
172 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
173 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
174 }
175 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
176
177 static struct attribute *iscsi_endpoint_attrs[] = {
178 &dev_attr_ep_handle.attr,
179 NULL,
180 };
181
182 static struct attribute_group iscsi_endpoint_group = {
183 .attrs = iscsi_endpoint_attrs,
184 };
185
186 #define ISCSI_MAX_EPID -1
187
188 static int iscsi_match_epid(struct device *dev, void *data)
189 {
190 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
191 uint64_t *epid = (uint64_t *) data;
192
193 return *epid == ep->id;
194 }
195
196 struct iscsi_endpoint *
197 iscsi_create_endpoint(int dd_size)
198 {
199 struct device *dev;
200 struct iscsi_endpoint *ep;
201 uint64_t id;
202 int err;
203
204 for (id = 1; id < ISCSI_MAX_EPID; id++) {
205 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
206 iscsi_match_epid);
207 if (!dev)
208 break;
209 }
210 if (id == ISCSI_MAX_EPID) {
211 printk(KERN_ERR "Too many connections. Max supported %u\n",
212 ISCSI_MAX_EPID - 1);
213 return NULL;
214 }
215
216 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
217 if (!ep)
218 return NULL;
219
220 ep->id = id;
221 ep->dev.class = &iscsi_endpoint_class;
222 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
223 err = device_register(&ep->dev);
224 if (err)
225 goto free_ep;
226
227 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
228 if (err)
229 goto unregister_dev;
230
231 if (dd_size)
232 ep->dd_data = &ep[1];
233 return ep;
234
235 unregister_dev:
236 device_unregister(&ep->dev);
237 return NULL;
238
239 free_ep:
240 kfree(ep);
241 return NULL;
242 }
243 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
244
245 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
246 {
247 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
248 device_unregister(&ep->dev);
249 }
250 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
251
252 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
253 {
254 struct iscsi_endpoint *ep;
255 struct device *dev;
256
257 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
258 iscsi_match_epid);
259 if (!dev)
260 return NULL;
261
262 ep = iscsi_dev_to_endpoint(dev);
263 /*
264 * we can drop this now because the interface will prevent
265 * removals and lookups from racing.
266 */
267 put_device(dev);
268 return ep;
269 }
270 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
271
272 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
273 struct device *cdev)
274 {
275 struct Scsi_Host *shost = dev_to_shost(dev);
276 struct iscsi_cls_host *ihost = shost->shost_data;
277
278 memset(ihost, 0, sizeof(*ihost));
279 atomic_set(&ihost->nr_scans, 0);
280 mutex_init(&ihost->mutex);
281 return 0;
282 }
283
284 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
285 "iscsi_host",
286 iscsi_setup_host,
287 NULL,
288 NULL);
289
290 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
291 "iscsi_session",
292 NULL,
293 NULL,
294 NULL);
295
296 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
297 "iscsi_connection",
298 NULL,
299 NULL,
300 NULL);
301
302 static struct sock *nls;
303 static DEFINE_MUTEX(rx_queue_mutex);
304
305 static LIST_HEAD(sesslist);
306 static DEFINE_SPINLOCK(sesslock);
307 static LIST_HEAD(connlist);
308 static DEFINE_SPINLOCK(connlock);
309
310 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
311 {
312 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
313 return sess->sid;
314 }
315
316 /*
317 * Returns the matching session to a given sid
318 */
319 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
320 {
321 unsigned long flags;
322 struct iscsi_cls_session *sess;
323
324 spin_lock_irqsave(&sesslock, flags);
325 list_for_each_entry(sess, &sesslist, sess_list) {
326 if (sess->sid == sid) {
327 spin_unlock_irqrestore(&sesslock, flags);
328 return sess;
329 }
330 }
331 spin_unlock_irqrestore(&sesslock, flags);
332 return NULL;
333 }
334
335 /*
336 * Returns the matching connection to a given sid / cid tuple
337 */
338 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
339 {
340 unsigned long flags;
341 struct iscsi_cls_conn *conn;
342
343 spin_lock_irqsave(&connlock, flags);
344 list_for_each_entry(conn, &connlist, conn_list) {
345 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
346 spin_unlock_irqrestore(&connlock, flags);
347 return conn;
348 }
349 }
350 spin_unlock_irqrestore(&connlock, flags);
351 return NULL;
352 }
353
354 /*
355 * The following functions can be used by LLDs that allocate
356 * their own scsi_hosts or by software iscsi LLDs
357 */
358 static struct {
359 int value;
360 char *name;
361 } iscsi_session_state_names[] = {
362 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
363 { ISCSI_SESSION_FAILED, "FAILED" },
364 { ISCSI_SESSION_FREE, "FREE" },
365 };
366
367 static const char *iscsi_session_state_name(int state)
368 {
369 int i;
370 char *name = NULL;
371
372 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
373 if (iscsi_session_state_names[i].value == state) {
374 name = iscsi_session_state_names[i].name;
375 break;
376 }
377 }
378 return name;
379 }
380
381 int iscsi_session_chkready(struct iscsi_cls_session *session)
382 {
383 unsigned long flags;
384 int err;
385
386 spin_lock_irqsave(&session->lock, flags);
387 switch (session->state) {
388 case ISCSI_SESSION_LOGGED_IN:
389 err = 0;
390 break;
391 case ISCSI_SESSION_FAILED:
392 err = DID_IMM_RETRY << 16;
393 break;
394 case ISCSI_SESSION_FREE:
395 err = DID_TRANSPORT_FAILFAST << 16;
396 break;
397 default:
398 err = DID_NO_CONNECT << 16;
399 break;
400 }
401 spin_unlock_irqrestore(&session->lock, flags);
402 return err;
403 }
404 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
405
406 static void iscsi_session_release(struct device *dev)
407 {
408 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
409 struct Scsi_Host *shost;
410
411 shost = iscsi_session_to_shost(session);
412 scsi_host_put(shost);
413 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
414 kfree(session);
415 }
416
417 static int iscsi_is_session_dev(const struct device *dev)
418 {
419 return dev->release == iscsi_session_release;
420 }
421
422 static int iscsi_iter_session_fn(struct device *dev, void *data)
423 {
424 void (* fn) (struct iscsi_cls_session *) = data;
425
426 if (!iscsi_is_session_dev(dev))
427 return 0;
428 fn(iscsi_dev_to_session(dev));
429 return 0;
430 }
431
432 void iscsi_host_for_each_session(struct Scsi_Host *shost,
433 void (*fn)(struct iscsi_cls_session *))
434 {
435 device_for_each_child(&shost->shost_gendev, fn,
436 iscsi_iter_session_fn);
437 }
438 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
439
440 /**
441 * iscsi_scan_finished - helper to report when running scans are done
442 * @shost: scsi host
443 * @time: scan run time
444 *
445 * This function can be used by drives like qla4xxx to report to the scsi
446 * layer when the scans it kicked off at module load time are done.
447 */
448 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
449 {
450 struct iscsi_cls_host *ihost = shost->shost_data;
451 /*
452 * qla4xxx will have kicked off some session unblocks before calling
453 * scsi_scan_host, so just wait for them to complete.
454 */
455 return !atomic_read(&ihost->nr_scans);
456 }
457 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
458
459 struct iscsi_scan_data {
460 unsigned int channel;
461 unsigned int id;
462 unsigned int lun;
463 };
464
465 static int iscsi_user_scan_session(struct device *dev, void *data)
466 {
467 struct iscsi_scan_data *scan_data = data;
468 struct iscsi_cls_session *session;
469 struct Scsi_Host *shost;
470 struct iscsi_cls_host *ihost;
471 unsigned long flags;
472 unsigned int id;
473
474 if (!iscsi_is_session_dev(dev))
475 return 0;
476
477 session = iscsi_dev_to_session(dev);
478
479 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
480
481 shost = iscsi_session_to_shost(session);
482 ihost = shost->shost_data;
483
484 mutex_lock(&ihost->mutex);
485 spin_lock_irqsave(&session->lock, flags);
486 if (session->state != ISCSI_SESSION_LOGGED_IN) {
487 spin_unlock_irqrestore(&session->lock, flags);
488 goto user_scan_exit;
489 }
490 id = session->target_id;
491 spin_unlock_irqrestore(&session->lock, flags);
492
493 if (id != ISCSI_MAX_TARGET) {
494 if ((scan_data->channel == SCAN_WILD_CARD ||
495 scan_data->channel == 0) &&
496 (scan_data->id == SCAN_WILD_CARD ||
497 scan_data->id == id))
498 scsi_scan_target(&session->dev, 0, id,
499 scan_data->lun, 1);
500 }
501
502 user_scan_exit:
503 mutex_unlock(&ihost->mutex);
504 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
505 return 0;
506 }
507
508 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
509 uint id, uint lun)
510 {
511 struct iscsi_scan_data scan_data;
512
513 scan_data.channel = channel;
514 scan_data.id = id;
515 scan_data.lun = lun;
516
517 return device_for_each_child(&shost->shost_gendev, &scan_data,
518 iscsi_user_scan_session);
519 }
520
521 static void iscsi_scan_session(struct work_struct *work)
522 {
523 struct iscsi_cls_session *session =
524 container_of(work, struct iscsi_cls_session, scan_work);
525 struct Scsi_Host *shost = iscsi_session_to_shost(session);
526 struct iscsi_cls_host *ihost = shost->shost_data;
527 struct iscsi_scan_data scan_data;
528
529 scan_data.channel = 0;
530 scan_data.id = SCAN_WILD_CARD;
531 scan_data.lun = SCAN_WILD_CARD;
532
533 iscsi_user_scan_session(&session->dev, &scan_data);
534 atomic_dec(&ihost->nr_scans);
535 }
536
537 static void session_recovery_timedout(struct work_struct *work)
538 {
539 struct iscsi_cls_session *session =
540 container_of(work, struct iscsi_cls_session,
541 recovery_work.work);
542 unsigned long flags;
543
544 iscsi_cls_session_printk(KERN_INFO, session,
545 "session recovery timed out after %d secs\n",
546 session->recovery_tmo);
547
548 spin_lock_irqsave(&session->lock, flags);
549 switch (session->state) {
550 case ISCSI_SESSION_FAILED:
551 session->state = ISCSI_SESSION_FREE;
552 break;
553 case ISCSI_SESSION_LOGGED_IN:
554 case ISCSI_SESSION_FREE:
555 /* we raced with the unblock's flush */
556 spin_unlock_irqrestore(&session->lock, flags);
557 return;
558 }
559 spin_unlock_irqrestore(&session->lock, flags);
560
561 if (session->transport->session_recovery_timedout)
562 session->transport->session_recovery_timedout(session);
563
564 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
565 scsi_target_unblock(&session->dev);
566 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
567 }
568
569 static void __iscsi_unblock_session(struct work_struct *work)
570 {
571 struct iscsi_cls_session *session =
572 container_of(work, struct iscsi_cls_session,
573 unblock_work);
574 struct Scsi_Host *shost = iscsi_session_to_shost(session);
575 struct iscsi_cls_host *ihost = shost->shost_data;
576 unsigned long flags;
577
578 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
579 /*
580 * The recovery and unblock work get run from the same workqueue,
581 * so try to cancel it if it was going to run after this unblock.
582 */
583 cancel_delayed_work(&session->recovery_work);
584 spin_lock_irqsave(&session->lock, flags);
585 session->state = ISCSI_SESSION_LOGGED_IN;
586 spin_unlock_irqrestore(&session->lock, flags);
587 /* start IO */
588 scsi_target_unblock(&session->dev);
589 /*
590 * Only do kernel scanning if the driver is properly hooked into
591 * the async scanning code (drivers like iscsi_tcp do login and
592 * scanning from userspace).
593 */
594 if (shost->hostt->scan_finished) {
595 if (scsi_queue_work(shost, &session->scan_work))
596 atomic_inc(&ihost->nr_scans);
597 }
598 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
599 }
600
601 /**
602 * iscsi_unblock_session - set a session as logged in and start IO.
603 * @session: iscsi session
604 *
605 * Mark a session as ready to accept IO.
606 */
607 void iscsi_unblock_session(struct iscsi_cls_session *session)
608 {
609 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
610 /*
611 * make sure all the events have completed before tell the driver
612 * it is safe
613 */
614 flush_workqueue(iscsi_eh_timer_workq);
615 }
616 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
617
618 static void __iscsi_block_session(struct work_struct *work)
619 {
620 struct iscsi_cls_session *session =
621 container_of(work, struct iscsi_cls_session,
622 block_work);
623 unsigned long flags;
624
625 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
626 spin_lock_irqsave(&session->lock, flags);
627 session->state = ISCSI_SESSION_FAILED;
628 spin_unlock_irqrestore(&session->lock, flags);
629 scsi_target_block(&session->dev);
630 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
631 if (session->recovery_tmo >= 0)
632 queue_delayed_work(iscsi_eh_timer_workq,
633 &session->recovery_work,
634 session->recovery_tmo * HZ);
635 }
636
637 void iscsi_block_session(struct iscsi_cls_session *session)
638 {
639 queue_work(iscsi_eh_timer_workq, &session->block_work);
640 }
641 EXPORT_SYMBOL_GPL(iscsi_block_session);
642
643 static void __iscsi_unbind_session(struct work_struct *work)
644 {
645 struct iscsi_cls_session *session =
646 container_of(work, struct iscsi_cls_session,
647 unbind_work);
648 struct Scsi_Host *shost = iscsi_session_to_shost(session);
649 struct iscsi_cls_host *ihost = shost->shost_data;
650 unsigned long flags;
651
652 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
653
654 /* Prevent new scans and make sure scanning is not in progress */
655 mutex_lock(&ihost->mutex);
656 spin_lock_irqsave(&session->lock, flags);
657 if (session->target_id == ISCSI_MAX_TARGET) {
658 spin_unlock_irqrestore(&session->lock, flags);
659 mutex_unlock(&ihost->mutex);
660 return;
661 }
662 session->target_id = ISCSI_MAX_TARGET;
663 spin_unlock_irqrestore(&session->lock, flags);
664 mutex_unlock(&ihost->mutex);
665
666 scsi_remove_target(&session->dev);
667 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
668 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
669 }
670
671 struct iscsi_cls_session *
672 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
673 int dd_size)
674 {
675 struct iscsi_cls_session *session;
676
677 session = kzalloc(sizeof(*session) + dd_size,
678 GFP_KERNEL);
679 if (!session)
680 return NULL;
681
682 session->transport = transport;
683 session->recovery_tmo = 120;
684 session->state = ISCSI_SESSION_FREE;
685 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
686 INIT_LIST_HEAD(&session->sess_list);
687 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
688 INIT_WORK(&session->block_work, __iscsi_block_session);
689 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
690 INIT_WORK(&session->scan_work, iscsi_scan_session);
691 spin_lock_init(&session->lock);
692
693 /* this is released in the dev's release function */
694 scsi_host_get(shost);
695 session->dev.parent = &shost->shost_gendev;
696 session->dev.release = iscsi_session_release;
697 device_initialize(&session->dev);
698 if (dd_size)
699 session->dd_data = &session[1];
700
701 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
702 return session;
703 }
704 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
705
706 static int iscsi_get_next_target_id(struct device *dev, void *data)
707 {
708 struct iscsi_cls_session *session;
709 unsigned long flags;
710 int err = 0;
711
712 if (!iscsi_is_session_dev(dev))
713 return 0;
714
715 session = iscsi_dev_to_session(dev);
716 spin_lock_irqsave(&session->lock, flags);
717 if (*((unsigned int *) data) == session->target_id)
718 err = -EEXIST;
719 spin_unlock_irqrestore(&session->lock, flags);
720 return err;
721 }
722
723 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
724 {
725 struct Scsi_Host *shost = iscsi_session_to_shost(session);
726 struct iscsi_cls_host *ihost;
727 unsigned long flags;
728 unsigned int id = target_id;
729 int err;
730
731 ihost = shost->shost_data;
732 session->sid = atomic_add_return(1, &iscsi_session_nr);
733
734 if (id == ISCSI_MAX_TARGET) {
735 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
736 err = device_for_each_child(&shost->shost_gendev, &id,
737 iscsi_get_next_target_id);
738 if (!err)
739 break;
740 }
741
742 if (id == ISCSI_MAX_TARGET) {
743 iscsi_cls_session_printk(KERN_ERR, session,
744 "Too many iscsi targets. Max "
745 "number of targets is %d.\n",
746 ISCSI_MAX_TARGET - 1);
747 err = -EOVERFLOW;
748 goto release_host;
749 }
750 }
751 session->target_id = id;
752
753 dev_set_name(&session->dev, "session%u", session->sid);
754 err = device_add(&session->dev);
755 if (err) {
756 iscsi_cls_session_printk(KERN_ERR, session,
757 "could not register session's dev\n");
758 goto release_host;
759 }
760 transport_register_device(&session->dev);
761
762 spin_lock_irqsave(&sesslock, flags);
763 list_add(&session->sess_list, &sesslist);
764 spin_unlock_irqrestore(&sesslock, flags);
765
766 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
767 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
768 return 0;
769
770 release_host:
771 scsi_host_put(shost);
772 return err;
773 }
774 EXPORT_SYMBOL_GPL(iscsi_add_session);
775
776 /**
777 * iscsi_create_session - create iscsi class session
778 * @shost: scsi host
779 * @transport: iscsi transport
780 * @dd_size: private driver data size
781 * @target_id: which target
782 *
783 * This can be called from a LLD or iscsi_transport.
784 */
785 struct iscsi_cls_session *
786 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
787 int dd_size, unsigned int target_id)
788 {
789 struct iscsi_cls_session *session;
790
791 session = iscsi_alloc_session(shost, transport, dd_size);
792 if (!session)
793 return NULL;
794
795 if (iscsi_add_session(session, target_id)) {
796 iscsi_free_session(session);
797 return NULL;
798 }
799 return session;
800 }
801 EXPORT_SYMBOL_GPL(iscsi_create_session);
802
803 static void iscsi_conn_release(struct device *dev)
804 {
805 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
806 struct device *parent = conn->dev.parent;
807
808 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
809 kfree(conn);
810 put_device(parent);
811 }
812
813 static int iscsi_is_conn_dev(const struct device *dev)
814 {
815 return dev->release == iscsi_conn_release;
816 }
817
818 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
819 {
820 if (!iscsi_is_conn_dev(dev))
821 return 0;
822 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
823 }
824
825 void iscsi_remove_session(struct iscsi_cls_session *session)
826 {
827 struct Scsi_Host *shost = iscsi_session_to_shost(session);
828 unsigned long flags;
829 int err;
830
831 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
832
833 spin_lock_irqsave(&sesslock, flags);
834 list_del(&session->sess_list);
835 spin_unlock_irqrestore(&sesslock, flags);
836
837 /* make sure there are no blocks/unblocks queued */
838 flush_workqueue(iscsi_eh_timer_workq);
839 /* make sure the timedout callout is not running */
840 if (!cancel_delayed_work(&session->recovery_work))
841 flush_workqueue(iscsi_eh_timer_workq);
842 /*
843 * If we are blocked let commands flow again. The lld or iscsi
844 * layer should set up the queuecommand to fail commands.
845 * We assume that LLD will not be calling block/unblock while
846 * removing the session.
847 */
848 spin_lock_irqsave(&session->lock, flags);
849 session->state = ISCSI_SESSION_FREE;
850 spin_unlock_irqrestore(&session->lock, flags);
851
852 scsi_target_unblock(&session->dev);
853 /* flush running scans then delete devices */
854 scsi_flush_work(shost);
855 __iscsi_unbind_session(&session->unbind_work);
856
857 /* hw iscsi may not have removed all connections from session */
858 err = device_for_each_child(&session->dev, NULL,
859 iscsi_iter_destroy_conn_fn);
860 if (err)
861 iscsi_cls_session_printk(KERN_ERR, session,
862 "Could not delete all connections "
863 "for session. Error %d.\n", err);
864
865 transport_unregister_device(&session->dev);
866
867 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
868 device_del(&session->dev);
869 }
870 EXPORT_SYMBOL_GPL(iscsi_remove_session);
871
872 void iscsi_free_session(struct iscsi_cls_session *session)
873 {
874 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
875 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
876 put_device(&session->dev);
877 }
878 EXPORT_SYMBOL_GPL(iscsi_free_session);
879
880 /**
881 * iscsi_destroy_session - destroy iscsi session
882 * @session: iscsi_session
883 *
884 * Can be called by a LLD or iscsi_transport. There must not be
885 * any running connections.
886 */
887 int iscsi_destroy_session(struct iscsi_cls_session *session)
888 {
889 iscsi_remove_session(session);
890 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
891 iscsi_free_session(session);
892 return 0;
893 }
894 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
895
896 /**
897 * iscsi_create_conn - create iscsi class connection
898 * @session: iscsi cls session
899 * @dd_size: private driver data size
900 * @cid: connection id
901 *
902 * This can be called from a LLD or iscsi_transport. The connection
903 * is child of the session so cid must be unique for all connections
904 * on the session.
905 *
906 * Since we do not support MCS, cid will normally be zero. In some cases
907 * for software iscsi we could be trying to preallocate a connection struct
908 * in which case there could be two connection structs and cid would be
909 * non-zero.
910 */
911 struct iscsi_cls_conn *
912 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
913 {
914 struct iscsi_transport *transport = session->transport;
915 struct iscsi_cls_conn *conn;
916 unsigned long flags;
917 int err;
918
919 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
920 if (!conn)
921 return NULL;
922 if (dd_size)
923 conn->dd_data = &conn[1];
924
925 INIT_LIST_HEAD(&conn->conn_list);
926 conn->transport = transport;
927 conn->cid = cid;
928
929 /* this is released in the dev's release function */
930 if (!get_device(&session->dev))
931 goto free_conn;
932
933 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
934 conn->dev.parent = &session->dev;
935 conn->dev.release = iscsi_conn_release;
936 err = device_register(&conn->dev);
937 if (err) {
938 iscsi_cls_session_printk(KERN_ERR, session, "could not "
939 "register connection's dev\n");
940 goto release_parent_ref;
941 }
942 transport_register_device(&conn->dev);
943
944 spin_lock_irqsave(&connlock, flags);
945 list_add(&conn->conn_list, &connlist);
946 conn->active = 1;
947 spin_unlock_irqrestore(&connlock, flags);
948
949 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
950 return conn;
951
952 release_parent_ref:
953 put_device(&session->dev);
954 free_conn:
955 kfree(conn);
956 return NULL;
957 }
958
959 EXPORT_SYMBOL_GPL(iscsi_create_conn);
960
961 /**
962 * iscsi_destroy_conn - destroy iscsi class connection
963 * @conn: iscsi cls session
964 *
965 * This can be called from a LLD or iscsi_transport.
966 */
967 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
968 {
969 unsigned long flags;
970
971 spin_lock_irqsave(&connlock, flags);
972 conn->active = 0;
973 list_del(&conn->conn_list);
974 spin_unlock_irqrestore(&connlock, flags);
975
976 transport_unregister_device(&conn->dev);
977 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
978 device_unregister(&conn->dev);
979 return 0;
980 }
981 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
982
983 /*
984 * iscsi interface functions
985 */
986 static struct iscsi_internal *
987 iscsi_if_transport_lookup(struct iscsi_transport *tt)
988 {
989 struct iscsi_internal *priv;
990 unsigned long flags;
991
992 spin_lock_irqsave(&iscsi_transport_lock, flags);
993 list_for_each_entry(priv, &iscsi_transports, list) {
994 if (tt == priv->iscsi_transport) {
995 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
996 return priv;
997 }
998 }
999 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1000 return NULL;
1001 }
1002
1003 static int
1004 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1005 {
1006 return nlmsg_multicast(nls, skb, 0, group, gfp);
1007 }
1008
1009 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1010 char *data, uint32_t data_size)
1011 {
1012 struct nlmsghdr *nlh;
1013 struct sk_buff *skb;
1014 struct iscsi_uevent *ev;
1015 char *pdu;
1016 struct iscsi_internal *priv;
1017 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1018 data_size);
1019
1020 priv = iscsi_if_transport_lookup(conn->transport);
1021 if (!priv)
1022 return -EINVAL;
1023
1024 skb = alloc_skb(len, GFP_ATOMIC);
1025 if (!skb) {
1026 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1027 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1028 "control PDU: OOM\n");
1029 return -ENOMEM;
1030 }
1031
1032 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1033 ev = NLMSG_DATA(nlh);
1034 memset(ev, 0, sizeof(*ev));
1035 ev->transport_handle = iscsi_handle(conn->transport);
1036 ev->type = ISCSI_KEVENT_RECV_PDU;
1037 ev->r.recv_req.cid = conn->cid;
1038 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1039 pdu = (char*)ev + sizeof(*ev);
1040 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1041 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1042
1043 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1044 }
1045 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1046
1047 int iscsi_offload_mesg(struct Scsi_Host *shost,
1048 struct iscsi_transport *transport, uint32_t type,
1049 char *data, uint16_t data_size)
1050 {
1051 struct nlmsghdr *nlh;
1052 struct sk_buff *skb;
1053 struct iscsi_uevent *ev;
1054 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1055
1056 skb = alloc_skb(len, GFP_ATOMIC);
1057 if (!skb) {
1058 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1059 return -ENOMEM;
1060 }
1061
1062 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1063 ev = NLMSG_DATA(nlh);
1064 memset(ev, 0, sizeof(*ev));
1065 ev->type = type;
1066 ev->transport_handle = iscsi_handle(transport);
1067 switch (type) {
1068 case ISCSI_KEVENT_PATH_REQ:
1069 ev->r.req_path.host_no = shost->host_no;
1070 break;
1071 case ISCSI_KEVENT_IF_DOWN:
1072 ev->r.notify_if_down.host_no = shost->host_no;
1073 break;
1074 }
1075
1076 memcpy((char *)ev + sizeof(*ev), data, data_size);
1077
1078 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1079 }
1080 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1081
1082 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1083 {
1084 struct nlmsghdr *nlh;
1085 struct sk_buff *skb;
1086 struct iscsi_uevent *ev;
1087 struct iscsi_internal *priv;
1088 int len = NLMSG_SPACE(sizeof(*ev));
1089
1090 priv = iscsi_if_transport_lookup(conn->transport);
1091 if (!priv)
1092 return;
1093
1094 skb = alloc_skb(len, GFP_ATOMIC);
1095 if (!skb) {
1096 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1097 "conn error (%d)\n", error);
1098 return;
1099 }
1100
1101 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1102 ev = NLMSG_DATA(nlh);
1103 ev->transport_handle = iscsi_handle(conn->transport);
1104 ev->type = ISCSI_KEVENT_CONN_ERROR;
1105 ev->r.connerror.error = error;
1106 ev->r.connerror.cid = conn->cid;
1107 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1108
1109 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1110
1111 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1112 error);
1113 }
1114 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1115
1116 static int
1117 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1118 void *payload, int size)
1119 {
1120 struct sk_buff *skb;
1121 struct nlmsghdr *nlh;
1122 int len = NLMSG_SPACE(size);
1123 int flags = multi ? NLM_F_MULTI : 0;
1124 int t = done ? NLMSG_DONE : type;
1125
1126 skb = alloc_skb(len, GFP_ATOMIC);
1127 if (!skb) {
1128 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1129 return -ENOMEM;
1130 }
1131
1132 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1133 nlh->nlmsg_flags = flags;
1134 memcpy(NLMSG_DATA(nlh), payload, size);
1135 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1136 }
1137
1138 static int
1139 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1140 {
1141 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1142 struct iscsi_stats *stats;
1143 struct sk_buff *skbstat;
1144 struct iscsi_cls_conn *conn;
1145 struct nlmsghdr *nlhstat;
1146 struct iscsi_uevent *evstat;
1147 struct iscsi_internal *priv;
1148 int len = NLMSG_SPACE(sizeof(*ev) +
1149 sizeof(struct iscsi_stats) +
1150 sizeof(struct iscsi_stats_custom) *
1151 ISCSI_STATS_CUSTOM_MAX);
1152 int err = 0;
1153
1154 priv = iscsi_if_transport_lookup(transport);
1155 if (!priv)
1156 return -EINVAL;
1157
1158 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1159 if (!conn)
1160 return -EEXIST;
1161
1162 do {
1163 int actual_size;
1164
1165 skbstat = alloc_skb(len, GFP_ATOMIC);
1166 if (!skbstat) {
1167 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1168 "deliver stats: OOM\n");
1169 return -ENOMEM;
1170 }
1171
1172 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1173 (len - sizeof(*nlhstat)), 0);
1174 evstat = NLMSG_DATA(nlhstat);
1175 memset(evstat, 0, sizeof(*evstat));
1176 evstat->transport_handle = iscsi_handle(conn->transport);
1177 evstat->type = nlh->nlmsg_type;
1178 evstat->u.get_stats.cid =
1179 ev->u.get_stats.cid;
1180 evstat->u.get_stats.sid =
1181 ev->u.get_stats.sid;
1182 stats = (struct iscsi_stats *)
1183 ((char*)evstat + sizeof(*evstat));
1184 memset(stats, 0, sizeof(*stats));
1185
1186 transport->get_stats(conn, stats);
1187 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1188 sizeof(struct iscsi_stats) +
1189 sizeof(struct iscsi_stats_custom) *
1190 stats->custom_length);
1191 actual_size -= sizeof(*nlhstat);
1192 actual_size = NLMSG_LENGTH(actual_size);
1193 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1194 nlhstat->nlmsg_len = actual_size;
1195
1196 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1197 GFP_ATOMIC);
1198 } while (err < 0 && err != -ECONNREFUSED);
1199
1200 return err;
1201 }
1202
1203 /**
1204 * iscsi_session_event - send session destr. completion event
1205 * @session: iscsi class session
1206 * @event: type of event
1207 */
1208 int iscsi_session_event(struct iscsi_cls_session *session,
1209 enum iscsi_uevent_e event)
1210 {
1211 struct iscsi_internal *priv;
1212 struct Scsi_Host *shost;
1213 struct iscsi_uevent *ev;
1214 struct sk_buff *skb;
1215 struct nlmsghdr *nlh;
1216 int rc, len = NLMSG_SPACE(sizeof(*ev));
1217
1218 priv = iscsi_if_transport_lookup(session->transport);
1219 if (!priv)
1220 return -EINVAL;
1221 shost = iscsi_session_to_shost(session);
1222
1223 skb = alloc_skb(len, GFP_KERNEL);
1224 if (!skb) {
1225 iscsi_cls_session_printk(KERN_ERR, session,
1226 "Cannot notify userspace of session "
1227 "event %u\n", event);
1228 return -ENOMEM;
1229 }
1230
1231 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1232 ev = NLMSG_DATA(nlh);
1233 ev->transport_handle = iscsi_handle(session->transport);
1234
1235 ev->type = event;
1236 switch (event) {
1237 case ISCSI_KEVENT_DESTROY_SESSION:
1238 ev->r.d_session.host_no = shost->host_no;
1239 ev->r.d_session.sid = session->sid;
1240 break;
1241 case ISCSI_KEVENT_CREATE_SESSION:
1242 ev->r.c_session_ret.host_no = shost->host_no;
1243 ev->r.c_session_ret.sid = session->sid;
1244 break;
1245 case ISCSI_KEVENT_UNBIND_SESSION:
1246 ev->r.unbind_session.host_no = shost->host_no;
1247 ev->r.unbind_session.sid = session->sid;
1248 break;
1249 default:
1250 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1251 "%u.\n", event);
1252 kfree_skb(skb);
1253 return -EINVAL;
1254 }
1255
1256 /*
1257 * this will occur if the daemon is not up, so we just warn
1258 * the user and when the daemon is restarted it will handle it
1259 */
1260 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1261 if (rc == -ESRCH)
1262 iscsi_cls_session_printk(KERN_ERR, session,
1263 "Cannot notify userspace of session "
1264 "event %u. Check iscsi daemon\n",
1265 event);
1266
1267 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1268 event, rc);
1269 return rc;
1270 }
1271 EXPORT_SYMBOL_GPL(iscsi_session_event);
1272
1273 static int
1274 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1275 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1276 uint16_t cmds_max, uint16_t queue_depth)
1277 {
1278 struct iscsi_transport *transport = priv->iscsi_transport;
1279 struct iscsi_cls_session *session;
1280 struct Scsi_Host *shost;
1281
1282 session = transport->create_session(ep, cmds_max, queue_depth,
1283 initial_cmdsn);
1284 if (!session)
1285 return -ENOMEM;
1286
1287 shost = iscsi_session_to_shost(session);
1288 ev->r.c_session_ret.host_no = shost->host_no;
1289 ev->r.c_session_ret.sid = session->sid;
1290 ISCSI_DBG_TRANS_SESSION(session,
1291 "Completed creating transport session\n");
1292 return 0;
1293 }
1294
1295 static int
1296 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1297 {
1298 struct iscsi_cls_conn *conn;
1299 struct iscsi_cls_session *session;
1300
1301 session = iscsi_session_lookup(ev->u.c_conn.sid);
1302 if (!session) {
1303 printk(KERN_ERR "iscsi: invalid session %d.\n",
1304 ev->u.c_conn.sid);
1305 return -EINVAL;
1306 }
1307
1308 conn = transport->create_conn(session, ev->u.c_conn.cid);
1309 if (!conn) {
1310 iscsi_cls_session_printk(KERN_ERR, session,
1311 "couldn't create a new connection.");
1312 return -ENOMEM;
1313 }
1314
1315 ev->r.c_conn_ret.sid = session->sid;
1316 ev->r.c_conn_ret.cid = conn->cid;
1317
1318 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1319 return 0;
1320 }
1321
1322 static int
1323 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1324 {
1325 struct iscsi_cls_conn *conn;
1326
1327 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1328 if (!conn)
1329 return -EINVAL;
1330
1331 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1332 if (transport->destroy_conn)
1333 transport->destroy_conn(conn);
1334
1335 return 0;
1336 }
1337
1338 static int
1339 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1340 {
1341 char *data = (char*)ev + sizeof(*ev);
1342 struct iscsi_cls_conn *conn;
1343 struct iscsi_cls_session *session;
1344 int err = 0, value = 0;
1345
1346 session = iscsi_session_lookup(ev->u.set_param.sid);
1347 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1348 if (!conn || !session)
1349 return -EINVAL;
1350
1351 switch (ev->u.set_param.param) {
1352 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1353 sscanf(data, "%d", &value);
1354 session->recovery_tmo = value;
1355 break;
1356 default:
1357 err = transport->set_param(conn, ev->u.set_param.param,
1358 data, ev->u.set_param.len);
1359 }
1360
1361 return err;
1362 }
1363
1364 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1365 struct iscsi_uevent *ev, int msg_type)
1366 {
1367 struct iscsi_endpoint *ep;
1368 struct sockaddr *dst_addr;
1369 struct Scsi_Host *shost = NULL;
1370 int non_blocking, err = 0;
1371
1372 if (!transport->ep_connect)
1373 return -EINVAL;
1374
1375 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1376 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1377 if (!shost) {
1378 printk(KERN_ERR "ep connect failed. Could not find "
1379 "host no %u\n",
1380 ev->u.ep_connect_through_host.host_no);
1381 return -ENODEV;
1382 }
1383 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1384 } else
1385 non_blocking = ev->u.ep_connect.non_blocking;
1386
1387 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1388 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1389 if (IS_ERR(ep)) {
1390 err = PTR_ERR(ep);
1391 goto release_host;
1392 }
1393
1394 ev->r.ep_connect_ret.handle = ep->id;
1395 release_host:
1396 if (shost)
1397 scsi_host_put(shost);
1398 return err;
1399 }
1400
1401 static int
1402 iscsi_if_transport_ep(struct iscsi_transport *transport,
1403 struct iscsi_uevent *ev, int msg_type)
1404 {
1405 struct iscsi_endpoint *ep;
1406 int rc = 0;
1407
1408 switch (msg_type) {
1409 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1410 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1411 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1412 break;
1413 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1414 if (!transport->ep_poll)
1415 return -EINVAL;
1416
1417 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1418 if (!ep)
1419 return -EINVAL;
1420
1421 ev->r.retcode = transport->ep_poll(ep,
1422 ev->u.ep_poll.timeout_ms);
1423 break;
1424 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1425 if (!transport->ep_disconnect)
1426 return -EINVAL;
1427
1428 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1429 if (!ep)
1430 return -EINVAL;
1431
1432 transport->ep_disconnect(ep);
1433 break;
1434 }
1435 return rc;
1436 }
1437
1438 static int
1439 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1440 struct iscsi_uevent *ev)
1441 {
1442 struct Scsi_Host *shost;
1443 struct sockaddr *dst_addr;
1444 int err;
1445
1446 if (!transport->tgt_dscvr)
1447 return -EINVAL;
1448
1449 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1450 if (!shost) {
1451 printk(KERN_ERR "target discovery could not find host no %u\n",
1452 ev->u.tgt_dscvr.host_no);
1453 return -ENODEV;
1454 }
1455
1456
1457 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1458 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1459 ev->u.tgt_dscvr.enable, dst_addr);
1460 scsi_host_put(shost);
1461 return err;
1462 }
1463
1464 static int
1465 iscsi_set_host_param(struct iscsi_transport *transport,
1466 struct iscsi_uevent *ev)
1467 {
1468 char *data = (char*)ev + sizeof(*ev);
1469 struct Scsi_Host *shost;
1470 int err;
1471
1472 if (!transport->set_host_param)
1473 return -ENOSYS;
1474
1475 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1476 if (!shost) {
1477 printk(KERN_ERR "set_host_param could not find host no %u\n",
1478 ev->u.set_host_param.host_no);
1479 return -ENODEV;
1480 }
1481
1482 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1483 data, ev->u.set_host_param.len);
1484 scsi_host_put(shost);
1485 return err;
1486 }
1487
1488 static int
1489 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1490 {
1491 struct Scsi_Host *shost;
1492 struct iscsi_path *params;
1493 int err;
1494
1495 if (!transport->set_path)
1496 return -ENOSYS;
1497
1498 shost = scsi_host_lookup(ev->u.set_path.host_no);
1499 if (!shost) {
1500 printk(KERN_ERR "set path could not find host no %u\n",
1501 ev->u.set_path.host_no);
1502 return -ENODEV;
1503 }
1504
1505 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1506 err = transport->set_path(shost, params);
1507
1508 scsi_host_put(shost);
1509 return err;
1510 }
1511
1512 static int
1513 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1514 {
1515 int err = 0;
1516 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1517 struct iscsi_transport *transport = NULL;
1518 struct iscsi_internal *priv;
1519 struct iscsi_cls_session *session;
1520 struct iscsi_cls_conn *conn;
1521 struct iscsi_endpoint *ep = NULL;
1522
1523 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1524 *group = ISCSI_NL_GRP_UIP;
1525 else
1526 *group = ISCSI_NL_GRP_ISCSID;
1527
1528 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1529 if (!priv)
1530 return -EINVAL;
1531 transport = priv->iscsi_transport;
1532
1533 if (!try_module_get(transport->owner))
1534 return -EINVAL;
1535
1536 switch (nlh->nlmsg_type) {
1537 case ISCSI_UEVENT_CREATE_SESSION:
1538 err = iscsi_if_create_session(priv, ep, ev,
1539 ev->u.c_session.initial_cmdsn,
1540 ev->u.c_session.cmds_max,
1541 ev->u.c_session.queue_depth);
1542 break;
1543 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1544 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1545 if (!ep) {
1546 err = -EINVAL;
1547 break;
1548 }
1549
1550 err = iscsi_if_create_session(priv, ep, ev,
1551 ev->u.c_bound_session.initial_cmdsn,
1552 ev->u.c_bound_session.cmds_max,
1553 ev->u.c_bound_session.queue_depth);
1554 break;
1555 case ISCSI_UEVENT_DESTROY_SESSION:
1556 session = iscsi_session_lookup(ev->u.d_session.sid);
1557 if (session)
1558 transport->destroy_session(session);
1559 else
1560 err = -EINVAL;
1561 break;
1562 case ISCSI_UEVENT_UNBIND_SESSION:
1563 session = iscsi_session_lookup(ev->u.d_session.sid);
1564 if (session)
1565 scsi_queue_work(iscsi_session_to_shost(session),
1566 &session->unbind_work);
1567 else
1568 err = -EINVAL;
1569 break;
1570 case ISCSI_UEVENT_CREATE_CONN:
1571 err = iscsi_if_create_conn(transport, ev);
1572 break;
1573 case ISCSI_UEVENT_DESTROY_CONN:
1574 err = iscsi_if_destroy_conn(transport, ev);
1575 break;
1576 case ISCSI_UEVENT_BIND_CONN:
1577 session = iscsi_session_lookup(ev->u.b_conn.sid);
1578 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1579
1580 if (session && conn)
1581 ev->r.retcode = transport->bind_conn(session, conn,
1582 ev->u.b_conn.transport_eph,
1583 ev->u.b_conn.is_leading);
1584 else
1585 err = -EINVAL;
1586 break;
1587 case ISCSI_UEVENT_SET_PARAM:
1588 err = iscsi_set_param(transport, ev);
1589 break;
1590 case ISCSI_UEVENT_START_CONN:
1591 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1592 if (conn)
1593 ev->r.retcode = transport->start_conn(conn);
1594 else
1595 err = -EINVAL;
1596 break;
1597 case ISCSI_UEVENT_STOP_CONN:
1598 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1599 if (conn)
1600 transport->stop_conn(conn, ev->u.stop_conn.flag);
1601 else
1602 err = -EINVAL;
1603 break;
1604 case ISCSI_UEVENT_SEND_PDU:
1605 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1606 if (conn)
1607 ev->r.retcode = transport->send_pdu(conn,
1608 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1609 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1610 ev->u.send_pdu.data_size);
1611 else
1612 err = -EINVAL;
1613 break;
1614 case ISCSI_UEVENT_GET_STATS:
1615 err = iscsi_if_get_stats(transport, nlh);
1616 break;
1617 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1618 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1619 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1620 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1621 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1622 break;
1623 case ISCSI_UEVENT_TGT_DSCVR:
1624 err = iscsi_tgt_dscvr(transport, ev);
1625 break;
1626 case ISCSI_UEVENT_SET_HOST_PARAM:
1627 err = iscsi_set_host_param(transport, ev);
1628 break;
1629 case ISCSI_UEVENT_PATH_UPDATE:
1630 err = iscsi_set_path(transport, ev);
1631 break;
1632 default:
1633 err = -ENOSYS;
1634 break;
1635 }
1636
1637 module_put(transport->owner);
1638 return err;
1639 }
1640
1641 /*
1642 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1643 * Malformed skbs with wrong lengths or invalid creds are not processed.
1644 */
1645 static void
1646 iscsi_if_rx(struct sk_buff *skb)
1647 {
1648 mutex_lock(&rx_queue_mutex);
1649 while (skb->len >= NLMSG_SPACE(0)) {
1650 int err;
1651 uint32_t rlen;
1652 struct nlmsghdr *nlh;
1653 struct iscsi_uevent *ev;
1654 uint32_t group;
1655
1656 nlh = nlmsg_hdr(skb);
1657 if (nlh->nlmsg_len < sizeof(*nlh) ||
1658 skb->len < nlh->nlmsg_len) {
1659 break;
1660 }
1661
1662 ev = NLMSG_DATA(nlh);
1663 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1664 if (rlen > skb->len)
1665 rlen = skb->len;
1666
1667 err = iscsi_if_recv_msg(skb, nlh, &group);
1668 if (err) {
1669 ev->type = ISCSI_KEVENT_IF_ERROR;
1670 ev->iferror = err;
1671 }
1672 do {
1673 /*
1674 * special case for GET_STATS:
1675 * on success - sending reply and stats from
1676 * inside of if_recv_msg(),
1677 * on error - fall through.
1678 */
1679 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1680 break;
1681 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1682 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1683 } while (err < 0 && err != -ECONNREFUSED);
1684 skb_pull(skb, rlen);
1685 }
1686 mutex_unlock(&rx_queue_mutex);
1687 }
1688
1689 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1690 struct device_attribute dev_attr_##_prefix##_##_name = \
1691 __ATTR(_name,_mode,_show,_store)
1692
1693 /*
1694 * iSCSI connection attrs
1695 */
1696 #define iscsi_conn_attr_show(param) \
1697 static ssize_t \
1698 show_conn_param_##param(struct device *dev, \
1699 struct device_attribute *attr, char *buf) \
1700 { \
1701 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1702 struct iscsi_transport *t = conn->transport; \
1703 return t->get_conn_param(conn, param, buf); \
1704 }
1705
1706 #define iscsi_conn_attr(field, param) \
1707 iscsi_conn_attr_show(param) \
1708 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1709 NULL);
1710
1711 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1712 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1713 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1714 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1715 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1716 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1717 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1718 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1719 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1720 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1721 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1722 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1723 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1724
1725 /*
1726 * iSCSI session attrs
1727 */
1728 #define iscsi_session_attr_show(param, perm) \
1729 static ssize_t \
1730 show_session_param_##param(struct device *dev, \
1731 struct device_attribute *attr, char *buf) \
1732 { \
1733 struct iscsi_cls_session *session = \
1734 iscsi_dev_to_session(dev->parent); \
1735 struct iscsi_transport *t = session->transport; \
1736 \
1737 if (perm && !capable(CAP_SYS_ADMIN)) \
1738 return -EACCES; \
1739 return t->get_session_param(session, param, buf); \
1740 }
1741
1742 #define iscsi_session_attr(field, param, perm) \
1743 iscsi_session_attr_show(param, perm) \
1744 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1745 NULL);
1746
1747 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1748 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1749 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1750 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1751 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1752 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1753 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1754 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1755 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1756 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1757 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1758 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1759 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1760 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1761 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1762 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1763 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1764 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
1765 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1766 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1767
1768 static ssize_t
1769 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1770 char *buf)
1771 {
1772 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1773 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1774 }
1775 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1776 NULL);
1777
1778 #define iscsi_priv_session_attr_show(field, format) \
1779 static ssize_t \
1780 show_priv_session_##field(struct device *dev, \
1781 struct device_attribute *attr, char *buf) \
1782 { \
1783 struct iscsi_cls_session *session = \
1784 iscsi_dev_to_session(dev->parent); \
1785 return sprintf(buf, format"\n", session->field); \
1786 }
1787
1788 #define iscsi_priv_session_attr(field, format) \
1789 iscsi_priv_session_attr_show(field, format) \
1790 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1791 NULL)
1792 iscsi_priv_session_attr(recovery_tmo, "%d");
1793
1794 /*
1795 * iSCSI host attrs
1796 */
1797 #define iscsi_host_attr_show(param) \
1798 static ssize_t \
1799 show_host_param_##param(struct device *dev, \
1800 struct device_attribute *attr, char *buf) \
1801 { \
1802 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1803 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1804 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1805 }
1806
1807 #define iscsi_host_attr(field, param) \
1808 iscsi_host_attr_show(param) \
1809 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1810 NULL);
1811
1812 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1813 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1814 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1815 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1816
1817 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1818 do { \
1819 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1820 count++; \
1821 } while (0)
1822
1823
1824 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1825 do { \
1826 if (tt->param_mask & param_flag) { \
1827 priv->session_attrs[count] = &dev_attr_sess_##field; \
1828 count++; \
1829 } \
1830 } while (0)
1831
1832 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1833 do { \
1834 if (tt->param_mask & param_flag) { \
1835 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1836 count++; \
1837 } \
1838 } while (0)
1839
1840 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1841 do { \
1842 if (tt->host_param_mask & param_flag) { \
1843 priv->host_attrs[count] = &dev_attr_host_##field; \
1844 count++; \
1845 } \
1846 } while (0)
1847
1848 static int iscsi_session_match(struct attribute_container *cont,
1849 struct device *dev)
1850 {
1851 struct iscsi_cls_session *session;
1852 struct Scsi_Host *shost;
1853 struct iscsi_internal *priv;
1854
1855 if (!iscsi_is_session_dev(dev))
1856 return 0;
1857
1858 session = iscsi_dev_to_session(dev);
1859 shost = iscsi_session_to_shost(session);
1860 if (!shost->transportt)
1861 return 0;
1862
1863 priv = to_iscsi_internal(shost->transportt);
1864 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1865 return 0;
1866
1867 return &priv->session_cont.ac == cont;
1868 }
1869
1870 static int iscsi_conn_match(struct attribute_container *cont,
1871 struct device *dev)
1872 {
1873 struct iscsi_cls_session *session;
1874 struct iscsi_cls_conn *conn;
1875 struct Scsi_Host *shost;
1876 struct iscsi_internal *priv;
1877
1878 if (!iscsi_is_conn_dev(dev))
1879 return 0;
1880
1881 conn = iscsi_dev_to_conn(dev);
1882 session = iscsi_dev_to_session(conn->dev.parent);
1883 shost = iscsi_session_to_shost(session);
1884
1885 if (!shost->transportt)
1886 return 0;
1887
1888 priv = to_iscsi_internal(shost->transportt);
1889 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1890 return 0;
1891
1892 return &priv->conn_cont.ac == cont;
1893 }
1894
1895 static int iscsi_host_match(struct attribute_container *cont,
1896 struct device *dev)
1897 {
1898 struct Scsi_Host *shost;
1899 struct iscsi_internal *priv;
1900
1901 if (!scsi_is_host_device(dev))
1902 return 0;
1903
1904 shost = dev_to_shost(dev);
1905 if (!shost->transportt ||
1906 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1907 return 0;
1908
1909 priv = to_iscsi_internal(shost->transportt);
1910 return &priv->t.host_attrs.ac == cont;
1911 }
1912
1913 struct scsi_transport_template *
1914 iscsi_register_transport(struct iscsi_transport *tt)
1915 {
1916 struct iscsi_internal *priv;
1917 unsigned long flags;
1918 int count = 0, err;
1919
1920 BUG_ON(!tt);
1921
1922 priv = iscsi_if_transport_lookup(tt);
1923 if (priv)
1924 return NULL;
1925
1926 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1927 if (!priv)
1928 return NULL;
1929 INIT_LIST_HEAD(&priv->list);
1930 priv->iscsi_transport = tt;
1931 priv->t.user_scan = iscsi_user_scan;
1932 priv->t.create_work_queue = 1;
1933
1934 priv->dev.class = &iscsi_transport_class;
1935 dev_set_name(&priv->dev, "%s", tt->name);
1936 err = device_register(&priv->dev);
1937 if (err)
1938 goto free_priv;
1939
1940 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1941 if (err)
1942 goto unregister_dev;
1943
1944 /* host parameters */
1945 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1946 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1947 priv->t.host_attrs.ac.match = iscsi_host_match;
1948 priv->t.host_size = sizeof(struct iscsi_cls_host);
1949 transport_container_register(&priv->t.host_attrs);
1950
1951 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1952 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1953 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1954 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1955 BUG_ON(count > ISCSI_HOST_ATTRS);
1956 priv->host_attrs[count] = NULL;
1957 count = 0;
1958
1959 /* connection parameters */
1960 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1961 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1962 priv->conn_cont.ac.match = iscsi_conn_match;
1963 transport_container_register(&priv->conn_cont);
1964
1965 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1966 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1967 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1968 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1969 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1970 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1971 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1972 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1973 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1974 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1975 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1976 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1977 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1978
1979 BUG_ON(count > ISCSI_CONN_ATTRS);
1980 priv->conn_attrs[count] = NULL;
1981 count = 0;
1982
1983 /* session parameters */
1984 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1985 priv->session_cont.ac.class = &iscsi_session_class.class;
1986 priv->session_cont.ac.match = iscsi_session_match;
1987 transport_container_register(&priv->session_cont);
1988
1989 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1990 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1991 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1992 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1993 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1994 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1995 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1996 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1997 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1998 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1999 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2000 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2001 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2002 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2003 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2004 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2005 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2006 SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
2007 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2008 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2009 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
2010 SETUP_PRIV_SESSION_RD_ATTR(state);
2011
2012 BUG_ON(count > ISCSI_SESSION_ATTRS);
2013 priv->session_attrs[count] = NULL;
2014
2015 spin_lock_irqsave(&iscsi_transport_lock, flags);
2016 list_add(&priv->list, &iscsi_transports);
2017 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2018
2019 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2020 return &priv->t;
2021
2022 unregister_dev:
2023 device_unregister(&priv->dev);
2024 return NULL;
2025 free_priv:
2026 kfree(priv);
2027 return NULL;
2028 }
2029 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2030
2031 int iscsi_unregister_transport(struct iscsi_transport *tt)
2032 {
2033 struct iscsi_internal *priv;
2034 unsigned long flags;
2035
2036 BUG_ON(!tt);
2037
2038 mutex_lock(&rx_queue_mutex);
2039
2040 priv = iscsi_if_transport_lookup(tt);
2041 BUG_ON (!priv);
2042
2043 spin_lock_irqsave(&iscsi_transport_lock, flags);
2044 list_del(&priv->list);
2045 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2046
2047 transport_container_unregister(&priv->conn_cont);
2048 transport_container_unregister(&priv->session_cont);
2049 transport_container_unregister(&priv->t.host_attrs);
2050
2051 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2052 device_unregister(&priv->dev);
2053 mutex_unlock(&rx_queue_mutex);
2054
2055 return 0;
2056 }
2057 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2058
2059 static __init int iscsi_transport_init(void)
2060 {
2061 int err;
2062
2063 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2064 ISCSI_TRANSPORT_VERSION);
2065
2066 atomic_set(&iscsi_session_nr, 0);
2067
2068 err = class_register(&iscsi_transport_class);
2069 if (err)
2070 return err;
2071
2072 err = class_register(&iscsi_endpoint_class);
2073 if (err)
2074 goto unregister_transport_class;
2075
2076 err = transport_class_register(&iscsi_host_class);
2077 if (err)
2078 goto unregister_endpoint_class;
2079
2080 err = transport_class_register(&iscsi_connection_class);
2081 if (err)
2082 goto unregister_host_class;
2083
2084 err = transport_class_register(&iscsi_session_class);
2085 if (err)
2086 goto unregister_conn_class;
2087
2088 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2089 NULL, THIS_MODULE);
2090 if (!nls) {
2091 err = -ENOBUFS;
2092 goto unregister_session_class;
2093 }
2094
2095 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2096 if (!iscsi_eh_timer_workq)
2097 goto release_nls;
2098
2099 return 0;
2100
2101 release_nls:
2102 netlink_kernel_release(nls);
2103 unregister_session_class:
2104 transport_class_unregister(&iscsi_session_class);
2105 unregister_conn_class:
2106 transport_class_unregister(&iscsi_connection_class);
2107 unregister_host_class:
2108 transport_class_unregister(&iscsi_host_class);
2109 unregister_endpoint_class:
2110 class_unregister(&iscsi_endpoint_class);
2111 unregister_transport_class:
2112 class_unregister(&iscsi_transport_class);
2113 return err;
2114 }
2115
2116 static void __exit iscsi_transport_exit(void)
2117 {
2118 destroy_workqueue(iscsi_eh_timer_workq);
2119 netlink_kernel_release(nls);
2120 transport_class_unregister(&iscsi_connection_class);
2121 transport_class_unregister(&iscsi_session_class);
2122 transport_class_unregister(&iscsi_host_class);
2123 class_unregister(&iscsi_endpoint_class);
2124 class_unregister(&iscsi_transport_class);
2125 }
2126
2127 module_init(iscsi_transport_init);
2128 module_exit(iscsi_transport_exit);
2129
2130 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2131 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2132 "Alex Aizman <itn780@yahoo.com>");
2133 MODULE_DESCRIPTION("iSCSI Transport Interface");
2134 MODULE_LICENSE("GPL");
2135 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
linux-next