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Merge branch 'slub/hotplug' into slab/urgent
[mirror_ubuntu-kernels.git] / drivers / scsi / scsi_transport_iscsi.c
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 #include <scsi/scsi_cmnd.h>
34
35 #define ISCSI_SESSION_ATTRS 23
36 #define ISCSI_CONN_ATTRS 13
37 #define ISCSI_HOST_ATTRS 4
38
39 #define ISCSI_TRANSPORT_VERSION "2.0-870"
40
41 static int dbg_session;
42 module_param_named(debug_session, dbg_session, int,
43 S_IRUGO | S_IWUSR);
44 MODULE_PARM_DESC(debug_session,
45 "Turn on debugging for sessions in scsi_transport_iscsi "
46 "module. Set to 1 to turn on, and zero to turn off. Default "
47 "is off.");
48
49 static int dbg_conn;
50 module_param_named(debug_conn, dbg_conn, int,
51 S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug_conn,
53 "Turn on debugging for connections in scsi_transport_iscsi "
54 "module. Set to 1 to turn on, and zero to turn off. Default "
55 "is off.");
56
57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58 do { \
59 if (dbg_session) \
60 iscsi_cls_session_printk(KERN_INFO, _session, \
61 "%s: " dbg_fmt, \
62 __func__, ##arg); \
63 } while (0);
64
65 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
66 do { \
67 if (dbg_conn) \
68 iscsi_cls_conn_printk(KERN_INFO, _conn, \
69 "%s: " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
73 struct iscsi_internal {
74 struct scsi_transport_template t;
75 struct iscsi_transport *iscsi_transport;
76 struct list_head list;
77 struct device dev;
78
79 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
80 struct transport_container conn_cont;
81 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
82 struct transport_container session_cont;
83 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
84 };
85
86 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
87 static struct workqueue_struct *iscsi_eh_timer_workq;
88
89 /*
90 * list of registered transports and lock that must
91 * be held while accessing list. The iscsi_transport_lock must
92 * be acquired after the rx_queue_mutex.
93 */
94 static LIST_HEAD(iscsi_transports);
95 static DEFINE_SPINLOCK(iscsi_transport_lock);
96
97 #define to_iscsi_internal(tmpl) \
98 container_of(tmpl, struct iscsi_internal, t)
99
100 #define dev_to_iscsi_internal(_dev) \
101 container_of(_dev, struct iscsi_internal, dev)
102
103 static void iscsi_transport_release(struct device *dev)
104 {
105 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
106 kfree(priv);
107 }
108
109 /*
110 * iscsi_transport_class represents the iscsi_transports that are
111 * registered.
112 */
113 static struct class iscsi_transport_class = {
114 .name = "iscsi_transport",
115 .dev_release = iscsi_transport_release,
116 };
117
118 static ssize_t
119 show_transport_handle(struct device *dev, struct device_attribute *attr,
120 char *buf)
121 {
122 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
123 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
124 }
125 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
126
127 #define show_transport_attr(name, format) \
128 static ssize_t \
129 show_transport_##name(struct device *dev, \
130 struct device_attribute *attr,char *buf) \
131 { \
132 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
133 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
134 } \
135 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
136
137 show_transport_attr(caps, "0x%x");
138
139 static struct attribute *iscsi_transport_attrs[] = {
140 &dev_attr_handle.attr,
141 &dev_attr_caps.attr,
142 NULL,
143 };
144
145 static struct attribute_group iscsi_transport_group = {
146 .attrs = iscsi_transport_attrs,
147 };
148
149 /*
150 * iSCSI endpoint attrs
151 */
152 #define iscsi_dev_to_endpoint(_dev) \
153 container_of(_dev, struct iscsi_endpoint, dev)
154
155 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
156 struct device_attribute dev_attr_##_prefix##_##_name = \
157 __ATTR(_name,_mode,_show,_store)
158
159 static void iscsi_endpoint_release(struct device *dev)
160 {
161 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
162 kfree(ep);
163 }
164
165 static struct class iscsi_endpoint_class = {
166 .name = "iscsi_endpoint",
167 .dev_release = iscsi_endpoint_release,
168 };
169
170 static ssize_t
171 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
172 {
173 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
174 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
175 }
176 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
177
178 static struct attribute *iscsi_endpoint_attrs[] = {
179 &dev_attr_ep_handle.attr,
180 NULL,
181 };
182
183 static struct attribute_group iscsi_endpoint_group = {
184 .attrs = iscsi_endpoint_attrs,
185 };
186
187 #define ISCSI_MAX_EPID -1
188
189 static int iscsi_match_epid(struct device *dev, void *data)
190 {
191 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
192 uint64_t *epid = (uint64_t *) data;
193
194 return *epid == ep->id;
195 }
196
197 struct iscsi_endpoint *
198 iscsi_create_endpoint(int dd_size)
199 {
200 struct device *dev;
201 struct iscsi_endpoint *ep;
202 uint64_t id;
203 int err;
204
205 for (id = 1; id < ISCSI_MAX_EPID; id++) {
206 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
207 iscsi_match_epid);
208 if (!dev)
209 break;
210 }
211 if (id == ISCSI_MAX_EPID) {
212 printk(KERN_ERR "Too many connections. Max supported %u\n",
213 ISCSI_MAX_EPID - 1);
214 return NULL;
215 }
216
217 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
218 if (!ep)
219 return NULL;
220
221 ep->id = id;
222 ep->dev.class = &iscsi_endpoint_class;
223 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
224 err = device_register(&ep->dev);
225 if (err)
226 goto free_ep;
227
228 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
229 if (err)
230 goto unregister_dev;
231
232 if (dd_size)
233 ep->dd_data = &ep[1];
234 return ep;
235
236 unregister_dev:
237 device_unregister(&ep->dev);
238 return NULL;
239
240 free_ep:
241 kfree(ep);
242 return NULL;
243 }
244 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
245
246 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
247 {
248 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
249 device_unregister(&ep->dev);
250 }
251 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
252
253 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
254 {
255 struct iscsi_endpoint *ep;
256 struct device *dev;
257
258 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
259 iscsi_match_epid);
260 if (!dev)
261 return NULL;
262
263 ep = iscsi_dev_to_endpoint(dev);
264 /*
265 * we can drop this now because the interface will prevent
266 * removals and lookups from racing.
267 */
268 put_device(dev);
269 return ep;
270 }
271 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
272
273 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
274 struct device *cdev)
275 {
276 struct Scsi_Host *shost = dev_to_shost(dev);
277 struct iscsi_cls_host *ihost = shost->shost_data;
278
279 memset(ihost, 0, sizeof(*ihost));
280 atomic_set(&ihost->nr_scans, 0);
281 mutex_init(&ihost->mutex);
282 return 0;
283 }
284
285 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
286 "iscsi_host",
287 iscsi_setup_host,
288 NULL,
289 NULL);
290
291 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
292 "iscsi_session",
293 NULL,
294 NULL,
295 NULL);
296
297 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
298 "iscsi_connection",
299 NULL,
300 NULL,
301 NULL);
302
303 static struct sock *nls;
304 static DEFINE_MUTEX(rx_queue_mutex);
305
306 static LIST_HEAD(sesslist);
307 static DEFINE_SPINLOCK(sesslock);
308 static LIST_HEAD(connlist);
309 static DEFINE_SPINLOCK(connlock);
310
311 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
312 {
313 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
314 return sess->sid;
315 }
316
317 /*
318 * Returns the matching session to a given sid
319 */
320 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
321 {
322 unsigned long flags;
323 struct iscsi_cls_session *sess;
324
325 spin_lock_irqsave(&sesslock, flags);
326 list_for_each_entry(sess, &sesslist, sess_list) {
327 if (sess->sid == sid) {
328 spin_unlock_irqrestore(&sesslock, flags);
329 return sess;
330 }
331 }
332 spin_unlock_irqrestore(&sesslock, flags);
333 return NULL;
334 }
335
336 /*
337 * Returns the matching connection to a given sid / cid tuple
338 */
339 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
340 {
341 unsigned long flags;
342 struct iscsi_cls_conn *conn;
343
344 spin_lock_irqsave(&connlock, flags);
345 list_for_each_entry(conn, &connlist, conn_list) {
346 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
347 spin_unlock_irqrestore(&connlock, flags);
348 return conn;
349 }
350 }
351 spin_unlock_irqrestore(&connlock, flags);
352 return NULL;
353 }
354
355 /*
356 * The following functions can be used by LLDs that allocate
357 * their own scsi_hosts or by software iscsi LLDs
358 */
359 static struct {
360 int value;
361 char *name;
362 } iscsi_session_state_names[] = {
363 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
364 { ISCSI_SESSION_FAILED, "FAILED" },
365 { ISCSI_SESSION_FREE, "FREE" },
366 };
367
368 static const char *iscsi_session_state_name(int state)
369 {
370 int i;
371 char *name = NULL;
372
373 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
374 if (iscsi_session_state_names[i].value == state) {
375 name = iscsi_session_state_names[i].name;
376 break;
377 }
378 }
379 return name;
380 }
381
382 int iscsi_session_chkready(struct iscsi_cls_session *session)
383 {
384 unsigned long flags;
385 int err;
386
387 spin_lock_irqsave(&session->lock, flags);
388 switch (session->state) {
389 case ISCSI_SESSION_LOGGED_IN:
390 err = 0;
391 break;
392 case ISCSI_SESSION_FAILED:
393 err = DID_IMM_RETRY << 16;
394 break;
395 case ISCSI_SESSION_FREE:
396 err = DID_TRANSPORT_FAILFAST << 16;
397 break;
398 default:
399 err = DID_NO_CONNECT << 16;
400 break;
401 }
402 spin_unlock_irqrestore(&session->lock, flags);
403 return err;
404 }
405 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
406
407 static void iscsi_session_release(struct device *dev)
408 {
409 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
410 struct Scsi_Host *shost;
411
412 shost = iscsi_session_to_shost(session);
413 scsi_host_put(shost);
414 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
415 kfree(session);
416 }
417
418 static int iscsi_is_session_dev(const struct device *dev)
419 {
420 return dev->release == iscsi_session_release;
421 }
422
423 static int iscsi_iter_session_fn(struct device *dev, void *data)
424 {
425 void (* fn) (struct iscsi_cls_session *) = data;
426
427 if (!iscsi_is_session_dev(dev))
428 return 0;
429 fn(iscsi_dev_to_session(dev));
430 return 0;
431 }
432
433 void iscsi_host_for_each_session(struct Scsi_Host *shost,
434 void (*fn)(struct iscsi_cls_session *))
435 {
436 device_for_each_child(&shost->shost_gendev, fn,
437 iscsi_iter_session_fn);
438 }
439 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
440
441 /**
442 * iscsi_scan_finished - helper to report when running scans are done
443 * @shost: scsi host
444 * @time: scan run time
445 *
446 * This function can be used by drives like qla4xxx to report to the scsi
447 * layer when the scans it kicked off at module load time are done.
448 */
449 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
450 {
451 struct iscsi_cls_host *ihost = shost->shost_data;
452 /*
453 * qla4xxx will have kicked off some session unblocks before calling
454 * scsi_scan_host, so just wait for them to complete.
455 */
456 return !atomic_read(&ihost->nr_scans);
457 }
458 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
459
460 struct iscsi_scan_data {
461 unsigned int channel;
462 unsigned int id;
463 unsigned int lun;
464 };
465
466 static int iscsi_user_scan_session(struct device *dev, void *data)
467 {
468 struct iscsi_scan_data *scan_data = data;
469 struct iscsi_cls_session *session;
470 struct Scsi_Host *shost;
471 struct iscsi_cls_host *ihost;
472 unsigned long flags;
473 unsigned int id;
474
475 if (!iscsi_is_session_dev(dev))
476 return 0;
477
478 session = iscsi_dev_to_session(dev);
479
480 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
481
482 shost = iscsi_session_to_shost(session);
483 ihost = shost->shost_data;
484
485 mutex_lock(&ihost->mutex);
486 spin_lock_irqsave(&session->lock, flags);
487 if (session->state != ISCSI_SESSION_LOGGED_IN) {
488 spin_unlock_irqrestore(&session->lock, flags);
489 goto user_scan_exit;
490 }
491 id = session->target_id;
492 spin_unlock_irqrestore(&session->lock, flags);
493
494 if (id != ISCSI_MAX_TARGET) {
495 if ((scan_data->channel == SCAN_WILD_CARD ||
496 scan_data->channel == 0) &&
497 (scan_data->id == SCAN_WILD_CARD ||
498 scan_data->id == id))
499 scsi_scan_target(&session->dev, 0, id,
500 scan_data->lun, 1);
501 }
502
503 user_scan_exit:
504 mutex_unlock(&ihost->mutex);
505 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
506 return 0;
507 }
508
509 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
510 uint id, uint lun)
511 {
512 struct iscsi_scan_data scan_data;
513
514 scan_data.channel = channel;
515 scan_data.id = id;
516 scan_data.lun = lun;
517
518 return device_for_each_child(&shost->shost_gendev, &scan_data,
519 iscsi_user_scan_session);
520 }
521
522 static void iscsi_scan_session(struct work_struct *work)
523 {
524 struct iscsi_cls_session *session =
525 container_of(work, struct iscsi_cls_session, scan_work);
526 struct Scsi_Host *shost = iscsi_session_to_shost(session);
527 struct iscsi_cls_host *ihost = shost->shost_data;
528 struct iscsi_scan_data scan_data;
529
530 scan_data.channel = 0;
531 scan_data.id = SCAN_WILD_CARD;
532 scan_data.lun = SCAN_WILD_CARD;
533
534 iscsi_user_scan_session(&session->dev, &scan_data);
535 atomic_dec(&ihost->nr_scans);
536 }
537
538 /**
539 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
540 * @cmd: scsi cmd passed to scsi eh handler
541 *
542 * If the session is down this function will wait for the recovery
543 * timer to fire or for the session to be logged back in. If the
544 * recovery timer fires then FAST_IO_FAIL is returned. The caller
545 * should pass this error value to the scsi eh.
546 */
547 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
548 {
549 struct iscsi_cls_session *session =
550 starget_to_session(scsi_target(cmd->device));
551 unsigned long flags;
552 int ret = 0;
553
554 spin_lock_irqsave(&session->lock, flags);
555 while (session->state != ISCSI_SESSION_LOGGED_IN) {
556 if (session->state == ISCSI_SESSION_FREE) {
557 ret = FAST_IO_FAIL;
558 break;
559 }
560 spin_unlock_irqrestore(&session->lock, flags);
561 msleep(1000);
562 spin_lock_irqsave(&session->lock, flags);
563 }
564 spin_unlock_irqrestore(&session->lock, flags);
565 return ret;
566 }
567 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
568
569 static void session_recovery_timedout(struct work_struct *work)
570 {
571 struct iscsi_cls_session *session =
572 container_of(work, struct iscsi_cls_session,
573 recovery_work.work);
574 unsigned long flags;
575
576 iscsi_cls_session_printk(KERN_INFO, session,
577 "session recovery timed out after %d secs\n",
578 session->recovery_tmo);
579
580 spin_lock_irqsave(&session->lock, flags);
581 switch (session->state) {
582 case ISCSI_SESSION_FAILED:
583 session->state = ISCSI_SESSION_FREE;
584 break;
585 case ISCSI_SESSION_LOGGED_IN:
586 case ISCSI_SESSION_FREE:
587 /* we raced with the unblock's flush */
588 spin_unlock_irqrestore(&session->lock, flags);
589 return;
590 }
591 spin_unlock_irqrestore(&session->lock, flags);
592
593 if (session->transport->session_recovery_timedout)
594 session->transport->session_recovery_timedout(session);
595
596 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
597 scsi_target_unblock(&session->dev);
598 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
599 }
600
601 static void __iscsi_unblock_session(struct work_struct *work)
602 {
603 struct iscsi_cls_session *session =
604 container_of(work, struct iscsi_cls_session,
605 unblock_work);
606 struct Scsi_Host *shost = iscsi_session_to_shost(session);
607 struct iscsi_cls_host *ihost = shost->shost_data;
608 unsigned long flags;
609
610 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
611 /*
612 * The recovery and unblock work get run from the same workqueue,
613 * so try to cancel it if it was going to run after this unblock.
614 */
615 cancel_delayed_work(&session->recovery_work);
616 spin_lock_irqsave(&session->lock, flags);
617 session->state = ISCSI_SESSION_LOGGED_IN;
618 spin_unlock_irqrestore(&session->lock, flags);
619 /* start IO */
620 scsi_target_unblock(&session->dev);
621 /*
622 * Only do kernel scanning if the driver is properly hooked into
623 * the async scanning code (drivers like iscsi_tcp do login and
624 * scanning from userspace).
625 */
626 if (shost->hostt->scan_finished) {
627 if (scsi_queue_work(shost, &session->scan_work))
628 atomic_inc(&ihost->nr_scans);
629 }
630 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
631 }
632
633 /**
634 * iscsi_unblock_session - set a session as logged in and start IO.
635 * @session: iscsi session
636 *
637 * Mark a session as ready to accept IO.
638 */
639 void iscsi_unblock_session(struct iscsi_cls_session *session)
640 {
641 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
642 /*
643 * make sure all the events have completed before tell the driver
644 * it is safe
645 */
646 flush_workqueue(iscsi_eh_timer_workq);
647 }
648 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
649
650 static void __iscsi_block_session(struct work_struct *work)
651 {
652 struct iscsi_cls_session *session =
653 container_of(work, struct iscsi_cls_session,
654 block_work);
655 unsigned long flags;
656
657 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
658 spin_lock_irqsave(&session->lock, flags);
659 session->state = ISCSI_SESSION_FAILED;
660 spin_unlock_irqrestore(&session->lock, flags);
661 scsi_target_block(&session->dev);
662 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
663 if (session->recovery_tmo >= 0)
664 queue_delayed_work(iscsi_eh_timer_workq,
665 &session->recovery_work,
666 session->recovery_tmo * HZ);
667 }
668
669 void iscsi_block_session(struct iscsi_cls_session *session)
670 {
671 queue_work(iscsi_eh_timer_workq, &session->block_work);
672 }
673 EXPORT_SYMBOL_GPL(iscsi_block_session);
674
675 static void __iscsi_unbind_session(struct work_struct *work)
676 {
677 struct iscsi_cls_session *session =
678 container_of(work, struct iscsi_cls_session,
679 unbind_work);
680 struct Scsi_Host *shost = iscsi_session_to_shost(session);
681 struct iscsi_cls_host *ihost = shost->shost_data;
682 unsigned long flags;
683
684 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
685
686 /* Prevent new scans and make sure scanning is not in progress */
687 mutex_lock(&ihost->mutex);
688 spin_lock_irqsave(&session->lock, flags);
689 if (session->target_id == ISCSI_MAX_TARGET) {
690 spin_unlock_irqrestore(&session->lock, flags);
691 mutex_unlock(&ihost->mutex);
692 return;
693 }
694 session->target_id = ISCSI_MAX_TARGET;
695 spin_unlock_irqrestore(&session->lock, flags);
696 mutex_unlock(&ihost->mutex);
697
698 scsi_remove_target(&session->dev);
699 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
700 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
701 }
702
703 struct iscsi_cls_session *
704 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
705 int dd_size)
706 {
707 struct iscsi_cls_session *session;
708
709 session = kzalloc(sizeof(*session) + dd_size,
710 GFP_KERNEL);
711 if (!session)
712 return NULL;
713
714 session->transport = transport;
715 session->recovery_tmo = 120;
716 session->state = ISCSI_SESSION_FREE;
717 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
718 INIT_LIST_HEAD(&session->sess_list);
719 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
720 INIT_WORK(&session->block_work, __iscsi_block_session);
721 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
722 INIT_WORK(&session->scan_work, iscsi_scan_session);
723 spin_lock_init(&session->lock);
724
725 /* this is released in the dev's release function */
726 scsi_host_get(shost);
727 session->dev.parent = &shost->shost_gendev;
728 session->dev.release = iscsi_session_release;
729 device_initialize(&session->dev);
730 if (dd_size)
731 session->dd_data = &session[1];
732
733 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
734 return session;
735 }
736 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
737
738 static int iscsi_get_next_target_id(struct device *dev, void *data)
739 {
740 struct iscsi_cls_session *session;
741 unsigned long flags;
742 int err = 0;
743
744 if (!iscsi_is_session_dev(dev))
745 return 0;
746
747 session = iscsi_dev_to_session(dev);
748 spin_lock_irqsave(&session->lock, flags);
749 if (*((unsigned int *) data) == session->target_id)
750 err = -EEXIST;
751 spin_unlock_irqrestore(&session->lock, flags);
752 return err;
753 }
754
755 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
756 {
757 struct Scsi_Host *shost = iscsi_session_to_shost(session);
758 struct iscsi_cls_host *ihost;
759 unsigned long flags;
760 unsigned int id = target_id;
761 int err;
762
763 ihost = shost->shost_data;
764 session->sid = atomic_add_return(1, &iscsi_session_nr);
765
766 if (id == ISCSI_MAX_TARGET) {
767 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
768 err = device_for_each_child(&shost->shost_gendev, &id,
769 iscsi_get_next_target_id);
770 if (!err)
771 break;
772 }
773
774 if (id == ISCSI_MAX_TARGET) {
775 iscsi_cls_session_printk(KERN_ERR, session,
776 "Too many iscsi targets. Max "
777 "number of targets is %d.\n",
778 ISCSI_MAX_TARGET - 1);
779 err = -EOVERFLOW;
780 goto release_host;
781 }
782 }
783 session->target_id = id;
784
785 dev_set_name(&session->dev, "session%u", session->sid);
786 err = device_add(&session->dev);
787 if (err) {
788 iscsi_cls_session_printk(KERN_ERR, session,
789 "could not register session's dev\n");
790 goto release_host;
791 }
792 transport_register_device(&session->dev);
793
794 spin_lock_irqsave(&sesslock, flags);
795 list_add(&session->sess_list, &sesslist);
796 spin_unlock_irqrestore(&sesslock, flags);
797
798 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
799 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
800 return 0;
801
802 release_host:
803 scsi_host_put(shost);
804 return err;
805 }
806 EXPORT_SYMBOL_GPL(iscsi_add_session);
807
808 /**
809 * iscsi_create_session - create iscsi class session
810 * @shost: scsi host
811 * @transport: iscsi transport
812 * @dd_size: private driver data size
813 * @target_id: which target
814 *
815 * This can be called from a LLD or iscsi_transport.
816 */
817 struct iscsi_cls_session *
818 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
819 int dd_size, unsigned int target_id)
820 {
821 struct iscsi_cls_session *session;
822
823 session = iscsi_alloc_session(shost, transport, dd_size);
824 if (!session)
825 return NULL;
826
827 if (iscsi_add_session(session, target_id)) {
828 iscsi_free_session(session);
829 return NULL;
830 }
831 return session;
832 }
833 EXPORT_SYMBOL_GPL(iscsi_create_session);
834
835 static void iscsi_conn_release(struct device *dev)
836 {
837 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
838 struct device *parent = conn->dev.parent;
839
840 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
841 kfree(conn);
842 put_device(parent);
843 }
844
845 static int iscsi_is_conn_dev(const struct device *dev)
846 {
847 return dev->release == iscsi_conn_release;
848 }
849
850 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
851 {
852 if (!iscsi_is_conn_dev(dev))
853 return 0;
854 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
855 }
856
857 void iscsi_remove_session(struct iscsi_cls_session *session)
858 {
859 struct Scsi_Host *shost = iscsi_session_to_shost(session);
860 unsigned long flags;
861 int err;
862
863 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
864
865 spin_lock_irqsave(&sesslock, flags);
866 list_del(&session->sess_list);
867 spin_unlock_irqrestore(&sesslock, flags);
868
869 /* make sure there are no blocks/unblocks queued */
870 flush_workqueue(iscsi_eh_timer_workq);
871 /* make sure the timedout callout is not running */
872 if (!cancel_delayed_work(&session->recovery_work))
873 flush_workqueue(iscsi_eh_timer_workq);
874 /*
875 * If we are blocked let commands flow again. The lld or iscsi
876 * layer should set up the queuecommand to fail commands.
877 * We assume that LLD will not be calling block/unblock while
878 * removing the session.
879 */
880 spin_lock_irqsave(&session->lock, flags);
881 session->state = ISCSI_SESSION_FREE;
882 spin_unlock_irqrestore(&session->lock, flags);
883
884 scsi_target_unblock(&session->dev);
885 /* flush running scans then delete devices */
886 scsi_flush_work(shost);
887 __iscsi_unbind_session(&session->unbind_work);
888
889 /* hw iscsi may not have removed all connections from session */
890 err = device_for_each_child(&session->dev, NULL,
891 iscsi_iter_destroy_conn_fn);
892 if (err)
893 iscsi_cls_session_printk(KERN_ERR, session,
894 "Could not delete all connections "
895 "for session. Error %d.\n", err);
896
897 transport_unregister_device(&session->dev);
898
899 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
900 device_del(&session->dev);
901 }
902 EXPORT_SYMBOL_GPL(iscsi_remove_session);
903
904 void iscsi_free_session(struct iscsi_cls_session *session)
905 {
906 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
907 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
908 put_device(&session->dev);
909 }
910 EXPORT_SYMBOL_GPL(iscsi_free_session);
911
912 /**
913 * iscsi_destroy_session - destroy iscsi session
914 * @session: iscsi_session
915 *
916 * Can be called by a LLD or iscsi_transport. There must not be
917 * any running connections.
918 */
919 int iscsi_destroy_session(struct iscsi_cls_session *session)
920 {
921 iscsi_remove_session(session);
922 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
923 iscsi_free_session(session);
924 return 0;
925 }
926 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
927
928 /**
929 * iscsi_create_conn - create iscsi class connection
930 * @session: iscsi cls session
931 * @dd_size: private driver data size
932 * @cid: connection id
933 *
934 * This can be called from a LLD or iscsi_transport. The connection
935 * is child of the session so cid must be unique for all connections
936 * on the session.
937 *
938 * Since we do not support MCS, cid will normally be zero. In some cases
939 * for software iscsi we could be trying to preallocate a connection struct
940 * in which case there could be two connection structs and cid would be
941 * non-zero.
942 */
943 struct iscsi_cls_conn *
944 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
945 {
946 struct iscsi_transport *transport = session->transport;
947 struct iscsi_cls_conn *conn;
948 unsigned long flags;
949 int err;
950
951 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
952 if (!conn)
953 return NULL;
954 if (dd_size)
955 conn->dd_data = &conn[1];
956
957 INIT_LIST_HEAD(&conn->conn_list);
958 conn->transport = transport;
959 conn->cid = cid;
960
961 /* this is released in the dev's release function */
962 if (!get_device(&session->dev))
963 goto free_conn;
964
965 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
966 conn->dev.parent = &session->dev;
967 conn->dev.release = iscsi_conn_release;
968 err = device_register(&conn->dev);
969 if (err) {
970 iscsi_cls_session_printk(KERN_ERR, session, "could not "
971 "register connection's dev\n");
972 goto release_parent_ref;
973 }
974 transport_register_device(&conn->dev);
975
976 spin_lock_irqsave(&connlock, flags);
977 list_add(&conn->conn_list, &connlist);
978 conn->active = 1;
979 spin_unlock_irqrestore(&connlock, flags);
980
981 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
982 return conn;
983
984 release_parent_ref:
985 put_device(&session->dev);
986 free_conn:
987 kfree(conn);
988 return NULL;
989 }
990
991 EXPORT_SYMBOL_GPL(iscsi_create_conn);
992
993 /**
994 * iscsi_destroy_conn - destroy iscsi class connection
995 * @conn: iscsi cls session
996 *
997 * This can be called from a LLD or iscsi_transport.
998 */
999 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1000 {
1001 unsigned long flags;
1002
1003 spin_lock_irqsave(&connlock, flags);
1004 conn->active = 0;
1005 list_del(&conn->conn_list);
1006 spin_unlock_irqrestore(&connlock, flags);
1007
1008 transport_unregister_device(&conn->dev);
1009 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1010 device_unregister(&conn->dev);
1011 return 0;
1012 }
1013 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1014
1015 /*
1016 * iscsi interface functions
1017 */
1018 static struct iscsi_internal *
1019 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1020 {
1021 struct iscsi_internal *priv;
1022 unsigned long flags;
1023
1024 spin_lock_irqsave(&iscsi_transport_lock, flags);
1025 list_for_each_entry(priv, &iscsi_transports, list) {
1026 if (tt == priv->iscsi_transport) {
1027 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1028 return priv;
1029 }
1030 }
1031 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1032 return NULL;
1033 }
1034
1035 static int
1036 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1037 {
1038 return nlmsg_multicast(nls, skb, 0, group, gfp);
1039 }
1040
1041 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1042 char *data, uint32_t data_size)
1043 {
1044 struct nlmsghdr *nlh;
1045 struct sk_buff *skb;
1046 struct iscsi_uevent *ev;
1047 char *pdu;
1048 struct iscsi_internal *priv;
1049 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1050 data_size);
1051
1052 priv = iscsi_if_transport_lookup(conn->transport);
1053 if (!priv)
1054 return -EINVAL;
1055
1056 skb = alloc_skb(len, GFP_ATOMIC);
1057 if (!skb) {
1058 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1059 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1060 "control PDU: OOM\n");
1061 return -ENOMEM;
1062 }
1063
1064 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1065 ev = NLMSG_DATA(nlh);
1066 memset(ev, 0, sizeof(*ev));
1067 ev->transport_handle = iscsi_handle(conn->transport);
1068 ev->type = ISCSI_KEVENT_RECV_PDU;
1069 ev->r.recv_req.cid = conn->cid;
1070 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1071 pdu = (char*)ev + sizeof(*ev);
1072 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1073 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1074
1075 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1076 }
1077 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1078
1079 int iscsi_offload_mesg(struct Scsi_Host *shost,
1080 struct iscsi_transport *transport, uint32_t type,
1081 char *data, uint16_t data_size)
1082 {
1083 struct nlmsghdr *nlh;
1084 struct sk_buff *skb;
1085 struct iscsi_uevent *ev;
1086 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1087
1088 skb = alloc_skb(len, GFP_ATOMIC);
1089 if (!skb) {
1090 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1091 return -ENOMEM;
1092 }
1093
1094 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1095 ev = NLMSG_DATA(nlh);
1096 memset(ev, 0, sizeof(*ev));
1097 ev->type = type;
1098 ev->transport_handle = iscsi_handle(transport);
1099 switch (type) {
1100 case ISCSI_KEVENT_PATH_REQ:
1101 ev->r.req_path.host_no = shost->host_no;
1102 break;
1103 case ISCSI_KEVENT_IF_DOWN:
1104 ev->r.notify_if_down.host_no = shost->host_no;
1105 break;
1106 }
1107
1108 memcpy((char *)ev + sizeof(*ev), data, data_size);
1109
1110 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1111 }
1112 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1113
1114 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1115 {
1116 struct nlmsghdr *nlh;
1117 struct sk_buff *skb;
1118 struct iscsi_uevent *ev;
1119 struct iscsi_internal *priv;
1120 int len = NLMSG_SPACE(sizeof(*ev));
1121
1122 priv = iscsi_if_transport_lookup(conn->transport);
1123 if (!priv)
1124 return;
1125
1126 skb = alloc_skb(len, GFP_ATOMIC);
1127 if (!skb) {
1128 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1129 "conn error (%d)\n", error);
1130 return;
1131 }
1132
1133 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1134 ev = NLMSG_DATA(nlh);
1135 ev->transport_handle = iscsi_handle(conn->transport);
1136 ev->type = ISCSI_KEVENT_CONN_ERROR;
1137 ev->r.connerror.error = error;
1138 ev->r.connerror.cid = conn->cid;
1139 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1140
1141 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1142
1143 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1144 error);
1145 }
1146 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1147
1148 static int
1149 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1150 void *payload, int size)
1151 {
1152 struct sk_buff *skb;
1153 struct nlmsghdr *nlh;
1154 int len = NLMSG_SPACE(size);
1155 int flags = multi ? NLM_F_MULTI : 0;
1156 int t = done ? NLMSG_DONE : type;
1157
1158 skb = alloc_skb(len, GFP_ATOMIC);
1159 if (!skb) {
1160 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1161 return -ENOMEM;
1162 }
1163
1164 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1165 nlh->nlmsg_flags = flags;
1166 memcpy(NLMSG_DATA(nlh), payload, size);
1167 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1168 }
1169
1170 static int
1171 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1172 {
1173 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1174 struct iscsi_stats *stats;
1175 struct sk_buff *skbstat;
1176 struct iscsi_cls_conn *conn;
1177 struct nlmsghdr *nlhstat;
1178 struct iscsi_uevent *evstat;
1179 struct iscsi_internal *priv;
1180 int len = NLMSG_SPACE(sizeof(*ev) +
1181 sizeof(struct iscsi_stats) +
1182 sizeof(struct iscsi_stats_custom) *
1183 ISCSI_STATS_CUSTOM_MAX);
1184 int err = 0;
1185
1186 priv = iscsi_if_transport_lookup(transport);
1187 if (!priv)
1188 return -EINVAL;
1189
1190 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1191 if (!conn)
1192 return -EEXIST;
1193
1194 do {
1195 int actual_size;
1196
1197 skbstat = alloc_skb(len, GFP_ATOMIC);
1198 if (!skbstat) {
1199 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1200 "deliver stats: OOM\n");
1201 return -ENOMEM;
1202 }
1203
1204 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1205 (len - sizeof(*nlhstat)), 0);
1206 evstat = NLMSG_DATA(nlhstat);
1207 memset(evstat, 0, sizeof(*evstat));
1208 evstat->transport_handle = iscsi_handle(conn->transport);
1209 evstat->type = nlh->nlmsg_type;
1210 evstat->u.get_stats.cid =
1211 ev->u.get_stats.cid;
1212 evstat->u.get_stats.sid =
1213 ev->u.get_stats.sid;
1214 stats = (struct iscsi_stats *)
1215 ((char*)evstat + sizeof(*evstat));
1216 memset(stats, 0, sizeof(*stats));
1217
1218 transport->get_stats(conn, stats);
1219 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1220 sizeof(struct iscsi_stats) +
1221 sizeof(struct iscsi_stats_custom) *
1222 stats->custom_length);
1223 actual_size -= sizeof(*nlhstat);
1224 actual_size = NLMSG_LENGTH(actual_size);
1225 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1226 nlhstat->nlmsg_len = actual_size;
1227
1228 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1229 GFP_ATOMIC);
1230 } while (err < 0 && err != -ECONNREFUSED);
1231
1232 return err;
1233 }
1234
1235 /**
1236 * iscsi_session_event - send session destr. completion event
1237 * @session: iscsi class session
1238 * @event: type of event
1239 */
1240 int iscsi_session_event(struct iscsi_cls_session *session,
1241 enum iscsi_uevent_e event)
1242 {
1243 struct iscsi_internal *priv;
1244 struct Scsi_Host *shost;
1245 struct iscsi_uevent *ev;
1246 struct sk_buff *skb;
1247 struct nlmsghdr *nlh;
1248 int rc, len = NLMSG_SPACE(sizeof(*ev));
1249
1250 priv = iscsi_if_transport_lookup(session->transport);
1251 if (!priv)
1252 return -EINVAL;
1253 shost = iscsi_session_to_shost(session);
1254
1255 skb = alloc_skb(len, GFP_KERNEL);
1256 if (!skb) {
1257 iscsi_cls_session_printk(KERN_ERR, session,
1258 "Cannot notify userspace of session "
1259 "event %u\n", event);
1260 return -ENOMEM;
1261 }
1262
1263 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1264 ev = NLMSG_DATA(nlh);
1265 ev->transport_handle = iscsi_handle(session->transport);
1266
1267 ev->type = event;
1268 switch (event) {
1269 case ISCSI_KEVENT_DESTROY_SESSION:
1270 ev->r.d_session.host_no = shost->host_no;
1271 ev->r.d_session.sid = session->sid;
1272 break;
1273 case ISCSI_KEVENT_CREATE_SESSION:
1274 ev->r.c_session_ret.host_no = shost->host_no;
1275 ev->r.c_session_ret.sid = session->sid;
1276 break;
1277 case ISCSI_KEVENT_UNBIND_SESSION:
1278 ev->r.unbind_session.host_no = shost->host_no;
1279 ev->r.unbind_session.sid = session->sid;
1280 break;
1281 default:
1282 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1283 "%u.\n", event);
1284 kfree_skb(skb);
1285 return -EINVAL;
1286 }
1287
1288 /*
1289 * this will occur if the daemon is not up, so we just warn
1290 * the user and when the daemon is restarted it will handle it
1291 */
1292 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1293 if (rc == -ESRCH)
1294 iscsi_cls_session_printk(KERN_ERR, session,
1295 "Cannot notify userspace of session "
1296 "event %u. Check iscsi daemon\n",
1297 event);
1298
1299 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1300 event, rc);
1301 return rc;
1302 }
1303 EXPORT_SYMBOL_GPL(iscsi_session_event);
1304
1305 static int
1306 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1307 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1308 uint16_t cmds_max, uint16_t queue_depth)
1309 {
1310 struct iscsi_transport *transport = priv->iscsi_transport;
1311 struct iscsi_cls_session *session;
1312 struct Scsi_Host *shost;
1313
1314 session = transport->create_session(ep, cmds_max, queue_depth,
1315 initial_cmdsn);
1316 if (!session)
1317 return -ENOMEM;
1318
1319 shost = iscsi_session_to_shost(session);
1320 ev->r.c_session_ret.host_no = shost->host_no;
1321 ev->r.c_session_ret.sid = session->sid;
1322 ISCSI_DBG_TRANS_SESSION(session,
1323 "Completed creating transport session\n");
1324 return 0;
1325 }
1326
1327 static int
1328 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1329 {
1330 struct iscsi_cls_conn *conn;
1331 struct iscsi_cls_session *session;
1332
1333 session = iscsi_session_lookup(ev->u.c_conn.sid);
1334 if (!session) {
1335 printk(KERN_ERR "iscsi: invalid session %d.\n",
1336 ev->u.c_conn.sid);
1337 return -EINVAL;
1338 }
1339
1340 conn = transport->create_conn(session, ev->u.c_conn.cid);
1341 if (!conn) {
1342 iscsi_cls_session_printk(KERN_ERR, session,
1343 "couldn't create a new connection.");
1344 return -ENOMEM;
1345 }
1346
1347 ev->r.c_conn_ret.sid = session->sid;
1348 ev->r.c_conn_ret.cid = conn->cid;
1349
1350 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1351 return 0;
1352 }
1353
1354 static int
1355 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1356 {
1357 struct iscsi_cls_conn *conn;
1358
1359 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1360 if (!conn)
1361 return -EINVAL;
1362
1363 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1364 if (transport->destroy_conn)
1365 transport->destroy_conn(conn);
1366
1367 return 0;
1368 }
1369
1370 static int
1371 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1372 {
1373 char *data = (char*)ev + sizeof(*ev);
1374 struct iscsi_cls_conn *conn;
1375 struct iscsi_cls_session *session;
1376 int err = 0, value = 0;
1377
1378 session = iscsi_session_lookup(ev->u.set_param.sid);
1379 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1380 if (!conn || !session)
1381 return -EINVAL;
1382
1383 switch (ev->u.set_param.param) {
1384 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1385 sscanf(data, "%d", &value);
1386 session->recovery_tmo = value;
1387 break;
1388 default:
1389 err = transport->set_param(conn, ev->u.set_param.param,
1390 data, ev->u.set_param.len);
1391 }
1392
1393 return err;
1394 }
1395
1396 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1397 struct iscsi_uevent *ev, int msg_type)
1398 {
1399 struct iscsi_endpoint *ep;
1400 struct sockaddr *dst_addr;
1401 struct Scsi_Host *shost = NULL;
1402 int non_blocking, err = 0;
1403
1404 if (!transport->ep_connect)
1405 return -EINVAL;
1406
1407 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1408 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1409 if (!shost) {
1410 printk(KERN_ERR "ep connect failed. Could not find "
1411 "host no %u\n",
1412 ev->u.ep_connect_through_host.host_no);
1413 return -ENODEV;
1414 }
1415 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1416 } else
1417 non_blocking = ev->u.ep_connect.non_blocking;
1418
1419 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1420 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1421 if (IS_ERR(ep)) {
1422 err = PTR_ERR(ep);
1423 goto release_host;
1424 }
1425
1426 ev->r.ep_connect_ret.handle = ep->id;
1427 release_host:
1428 if (shost)
1429 scsi_host_put(shost);
1430 return err;
1431 }
1432
1433 static int
1434 iscsi_if_transport_ep(struct iscsi_transport *transport,
1435 struct iscsi_uevent *ev, int msg_type)
1436 {
1437 struct iscsi_endpoint *ep;
1438 int rc = 0;
1439
1440 switch (msg_type) {
1441 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1442 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1443 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1444 break;
1445 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1446 if (!transport->ep_poll)
1447 return -EINVAL;
1448
1449 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1450 if (!ep)
1451 return -EINVAL;
1452
1453 ev->r.retcode = transport->ep_poll(ep,
1454 ev->u.ep_poll.timeout_ms);
1455 break;
1456 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1457 if (!transport->ep_disconnect)
1458 return -EINVAL;
1459
1460 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1461 if (!ep)
1462 return -EINVAL;
1463
1464 transport->ep_disconnect(ep);
1465 break;
1466 }
1467 return rc;
1468 }
1469
1470 static int
1471 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1472 struct iscsi_uevent *ev)
1473 {
1474 struct Scsi_Host *shost;
1475 struct sockaddr *dst_addr;
1476 int err;
1477
1478 if (!transport->tgt_dscvr)
1479 return -EINVAL;
1480
1481 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1482 if (!shost) {
1483 printk(KERN_ERR "target discovery could not find host no %u\n",
1484 ev->u.tgt_dscvr.host_no);
1485 return -ENODEV;
1486 }
1487
1488
1489 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1490 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1491 ev->u.tgt_dscvr.enable, dst_addr);
1492 scsi_host_put(shost);
1493 return err;
1494 }
1495
1496 static int
1497 iscsi_set_host_param(struct iscsi_transport *transport,
1498 struct iscsi_uevent *ev)
1499 {
1500 char *data = (char*)ev + sizeof(*ev);
1501 struct Scsi_Host *shost;
1502 int err;
1503
1504 if (!transport->set_host_param)
1505 return -ENOSYS;
1506
1507 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1508 if (!shost) {
1509 printk(KERN_ERR "set_host_param could not find host no %u\n",
1510 ev->u.set_host_param.host_no);
1511 return -ENODEV;
1512 }
1513
1514 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1515 data, ev->u.set_host_param.len);
1516 scsi_host_put(shost);
1517 return err;
1518 }
1519
1520 static int
1521 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1522 {
1523 struct Scsi_Host *shost;
1524 struct iscsi_path *params;
1525 int err;
1526
1527 if (!transport->set_path)
1528 return -ENOSYS;
1529
1530 shost = scsi_host_lookup(ev->u.set_path.host_no);
1531 if (!shost) {
1532 printk(KERN_ERR "set path could not find host no %u\n",
1533 ev->u.set_path.host_no);
1534 return -ENODEV;
1535 }
1536
1537 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1538 err = transport->set_path(shost, params);
1539
1540 scsi_host_put(shost);
1541 return err;
1542 }
1543
1544 static int
1545 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1546 {
1547 int err = 0;
1548 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1549 struct iscsi_transport *transport = NULL;
1550 struct iscsi_internal *priv;
1551 struct iscsi_cls_session *session;
1552 struct iscsi_cls_conn *conn;
1553 struct iscsi_endpoint *ep = NULL;
1554
1555 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1556 *group = ISCSI_NL_GRP_UIP;
1557 else
1558 *group = ISCSI_NL_GRP_ISCSID;
1559
1560 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1561 if (!priv)
1562 return -EINVAL;
1563 transport = priv->iscsi_transport;
1564
1565 if (!try_module_get(transport->owner))
1566 return -EINVAL;
1567
1568 switch (nlh->nlmsg_type) {
1569 case ISCSI_UEVENT_CREATE_SESSION:
1570 err = iscsi_if_create_session(priv, ep, ev,
1571 ev->u.c_session.initial_cmdsn,
1572 ev->u.c_session.cmds_max,
1573 ev->u.c_session.queue_depth);
1574 break;
1575 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1576 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1577 if (!ep) {
1578 err = -EINVAL;
1579 break;
1580 }
1581
1582 err = iscsi_if_create_session(priv, ep, ev,
1583 ev->u.c_bound_session.initial_cmdsn,
1584 ev->u.c_bound_session.cmds_max,
1585 ev->u.c_bound_session.queue_depth);
1586 break;
1587 case ISCSI_UEVENT_DESTROY_SESSION:
1588 session = iscsi_session_lookup(ev->u.d_session.sid);
1589 if (session)
1590 transport->destroy_session(session);
1591 else
1592 err = -EINVAL;
1593 break;
1594 case ISCSI_UEVENT_UNBIND_SESSION:
1595 session = iscsi_session_lookup(ev->u.d_session.sid);
1596 if (session)
1597 scsi_queue_work(iscsi_session_to_shost(session),
1598 &session->unbind_work);
1599 else
1600 err = -EINVAL;
1601 break;
1602 case ISCSI_UEVENT_CREATE_CONN:
1603 err = iscsi_if_create_conn(transport, ev);
1604 break;
1605 case ISCSI_UEVENT_DESTROY_CONN:
1606 err = iscsi_if_destroy_conn(transport, ev);
1607 break;
1608 case ISCSI_UEVENT_BIND_CONN:
1609 session = iscsi_session_lookup(ev->u.b_conn.sid);
1610 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1611
1612 if (session && conn)
1613 ev->r.retcode = transport->bind_conn(session, conn,
1614 ev->u.b_conn.transport_eph,
1615 ev->u.b_conn.is_leading);
1616 else
1617 err = -EINVAL;
1618 break;
1619 case ISCSI_UEVENT_SET_PARAM:
1620 err = iscsi_set_param(transport, ev);
1621 break;
1622 case ISCSI_UEVENT_START_CONN:
1623 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1624 if (conn)
1625 ev->r.retcode = transport->start_conn(conn);
1626 else
1627 err = -EINVAL;
1628 break;
1629 case ISCSI_UEVENT_STOP_CONN:
1630 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1631 if (conn)
1632 transport->stop_conn(conn, ev->u.stop_conn.flag);
1633 else
1634 err = -EINVAL;
1635 break;
1636 case ISCSI_UEVENT_SEND_PDU:
1637 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1638 if (conn)
1639 ev->r.retcode = transport->send_pdu(conn,
1640 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1641 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1642 ev->u.send_pdu.data_size);
1643 else
1644 err = -EINVAL;
1645 break;
1646 case ISCSI_UEVENT_GET_STATS:
1647 err = iscsi_if_get_stats(transport, nlh);
1648 break;
1649 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1650 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1651 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1652 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1653 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1654 break;
1655 case ISCSI_UEVENT_TGT_DSCVR:
1656 err = iscsi_tgt_dscvr(transport, ev);
1657 break;
1658 case ISCSI_UEVENT_SET_HOST_PARAM:
1659 err = iscsi_set_host_param(transport, ev);
1660 break;
1661 case ISCSI_UEVENT_PATH_UPDATE:
1662 err = iscsi_set_path(transport, ev);
1663 break;
1664 default:
1665 err = -ENOSYS;
1666 break;
1667 }
1668
1669 module_put(transport->owner);
1670 return err;
1671 }
1672
1673 /*
1674 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1675 * Malformed skbs with wrong lengths or invalid creds are not processed.
1676 */
1677 static void
1678 iscsi_if_rx(struct sk_buff *skb)
1679 {
1680 mutex_lock(&rx_queue_mutex);
1681 while (skb->len >= NLMSG_SPACE(0)) {
1682 int err;
1683 uint32_t rlen;
1684 struct nlmsghdr *nlh;
1685 struct iscsi_uevent *ev;
1686 uint32_t group;
1687
1688 nlh = nlmsg_hdr(skb);
1689 if (nlh->nlmsg_len < sizeof(*nlh) ||
1690 skb->len < nlh->nlmsg_len) {
1691 break;
1692 }
1693
1694 ev = NLMSG_DATA(nlh);
1695 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1696 if (rlen > skb->len)
1697 rlen = skb->len;
1698
1699 err = iscsi_if_recv_msg(skb, nlh, &group);
1700 if (err) {
1701 ev->type = ISCSI_KEVENT_IF_ERROR;
1702 ev->iferror = err;
1703 }
1704 do {
1705 /*
1706 * special case for GET_STATS:
1707 * on success - sending reply and stats from
1708 * inside of if_recv_msg(),
1709 * on error - fall through.
1710 */
1711 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1712 break;
1713 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1714 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1715 } while (err < 0 && err != -ECONNREFUSED);
1716 skb_pull(skb, rlen);
1717 }
1718 mutex_unlock(&rx_queue_mutex);
1719 }
1720
1721 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1722 struct device_attribute dev_attr_##_prefix##_##_name = \
1723 __ATTR(_name,_mode,_show,_store)
1724
1725 /*
1726 * iSCSI connection attrs
1727 */
1728 #define iscsi_conn_attr_show(param) \
1729 static ssize_t \
1730 show_conn_param_##param(struct device *dev, \
1731 struct device_attribute *attr, char *buf) \
1732 { \
1733 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1734 struct iscsi_transport *t = conn->transport; \
1735 return t->get_conn_param(conn, param, buf); \
1736 }
1737
1738 #define iscsi_conn_attr(field, param) \
1739 iscsi_conn_attr_show(param) \
1740 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1741 NULL);
1742
1743 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1744 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1745 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1746 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1747 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1748 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1749 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1750 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1751 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1752 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1753 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1754 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1755 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1756
1757 /*
1758 * iSCSI session attrs
1759 */
1760 #define iscsi_session_attr_show(param, perm) \
1761 static ssize_t \
1762 show_session_param_##param(struct device *dev, \
1763 struct device_attribute *attr, char *buf) \
1764 { \
1765 struct iscsi_cls_session *session = \
1766 iscsi_dev_to_session(dev->parent); \
1767 struct iscsi_transport *t = session->transport; \
1768 \
1769 if (perm && !capable(CAP_SYS_ADMIN)) \
1770 return -EACCES; \
1771 return t->get_session_param(session, param, buf); \
1772 }
1773
1774 #define iscsi_session_attr(field, param, perm) \
1775 iscsi_session_attr_show(param, perm) \
1776 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1777 NULL);
1778
1779 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1780 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1781 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1782 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1783 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1784 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1785 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1786 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1787 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1788 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1789 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1790 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1791 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1792 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1793 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1794 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1795 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1796 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
1797 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1798 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
1799 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1800
1801 static ssize_t
1802 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1803 char *buf)
1804 {
1805 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1806 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1807 }
1808 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1809 NULL);
1810
1811 #define iscsi_priv_session_attr_show(field, format) \
1812 static ssize_t \
1813 show_priv_session_##field(struct device *dev, \
1814 struct device_attribute *attr, char *buf) \
1815 { \
1816 struct iscsi_cls_session *session = \
1817 iscsi_dev_to_session(dev->parent); \
1818 if (session->field == -1) \
1819 return sprintf(buf, "off\n"); \
1820 return sprintf(buf, format"\n", session->field); \
1821 }
1822
1823 #define iscsi_priv_session_attr_store(field) \
1824 static ssize_t \
1825 store_priv_session_##field(struct device *dev, \
1826 struct device_attribute *attr, \
1827 const char *buf, size_t count) \
1828 { \
1829 int val; \
1830 char *cp; \
1831 struct iscsi_cls_session *session = \
1832 iscsi_dev_to_session(dev->parent); \
1833 if ((session->state == ISCSI_SESSION_FREE) || \
1834 (session->state == ISCSI_SESSION_FAILED)) \
1835 return -EBUSY; \
1836 if (strncmp(buf, "off", 3) == 0) \
1837 session->field = -1; \
1838 else { \
1839 val = simple_strtoul(buf, &cp, 0); \
1840 if (*cp != '\0' && *cp != '\n') \
1841 return -EINVAL; \
1842 session->field = val; \
1843 } \
1844 return count; \
1845 }
1846
1847 #define iscsi_priv_session_rw_attr(field, format) \
1848 iscsi_priv_session_attr_show(field, format) \
1849 iscsi_priv_session_attr_store(field) \
1850 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUGO, \
1851 show_priv_session_##field, \
1852 store_priv_session_##field)
1853 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
1854
1855 /*
1856 * iSCSI host attrs
1857 */
1858 #define iscsi_host_attr_show(param) \
1859 static ssize_t \
1860 show_host_param_##param(struct device *dev, \
1861 struct device_attribute *attr, char *buf) \
1862 { \
1863 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1864 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1865 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1866 }
1867
1868 #define iscsi_host_attr(field, param) \
1869 iscsi_host_attr_show(param) \
1870 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1871 NULL);
1872
1873 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1874 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1875 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1876 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1877
1878 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1879 do { \
1880 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1881 count++; \
1882 } while (0)
1883
1884 #define SETUP_PRIV_SESSION_RW_ATTR(field) \
1885 do { \
1886 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1887 count++; \
1888 } while (0)
1889
1890 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1891 do { \
1892 if (tt->param_mask & param_flag) { \
1893 priv->session_attrs[count] = &dev_attr_sess_##field; \
1894 count++; \
1895 } \
1896 } while (0)
1897
1898 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1899 do { \
1900 if (tt->param_mask & param_flag) { \
1901 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1902 count++; \
1903 } \
1904 } while (0)
1905
1906 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1907 do { \
1908 if (tt->host_param_mask & param_flag) { \
1909 priv->host_attrs[count] = &dev_attr_host_##field; \
1910 count++; \
1911 } \
1912 } while (0)
1913
1914 static int iscsi_session_match(struct attribute_container *cont,
1915 struct device *dev)
1916 {
1917 struct iscsi_cls_session *session;
1918 struct Scsi_Host *shost;
1919 struct iscsi_internal *priv;
1920
1921 if (!iscsi_is_session_dev(dev))
1922 return 0;
1923
1924 session = iscsi_dev_to_session(dev);
1925 shost = iscsi_session_to_shost(session);
1926 if (!shost->transportt)
1927 return 0;
1928
1929 priv = to_iscsi_internal(shost->transportt);
1930 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1931 return 0;
1932
1933 return &priv->session_cont.ac == cont;
1934 }
1935
1936 static int iscsi_conn_match(struct attribute_container *cont,
1937 struct device *dev)
1938 {
1939 struct iscsi_cls_session *session;
1940 struct iscsi_cls_conn *conn;
1941 struct Scsi_Host *shost;
1942 struct iscsi_internal *priv;
1943
1944 if (!iscsi_is_conn_dev(dev))
1945 return 0;
1946
1947 conn = iscsi_dev_to_conn(dev);
1948 session = iscsi_dev_to_session(conn->dev.parent);
1949 shost = iscsi_session_to_shost(session);
1950
1951 if (!shost->transportt)
1952 return 0;
1953
1954 priv = to_iscsi_internal(shost->transportt);
1955 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1956 return 0;
1957
1958 return &priv->conn_cont.ac == cont;
1959 }
1960
1961 static int iscsi_host_match(struct attribute_container *cont,
1962 struct device *dev)
1963 {
1964 struct Scsi_Host *shost;
1965 struct iscsi_internal *priv;
1966
1967 if (!scsi_is_host_device(dev))
1968 return 0;
1969
1970 shost = dev_to_shost(dev);
1971 if (!shost->transportt ||
1972 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1973 return 0;
1974
1975 priv = to_iscsi_internal(shost->transportt);
1976 return &priv->t.host_attrs.ac == cont;
1977 }
1978
1979 struct scsi_transport_template *
1980 iscsi_register_transport(struct iscsi_transport *tt)
1981 {
1982 struct iscsi_internal *priv;
1983 unsigned long flags;
1984 int count = 0, err;
1985
1986 BUG_ON(!tt);
1987
1988 priv = iscsi_if_transport_lookup(tt);
1989 if (priv)
1990 return NULL;
1991
1992 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1993 if (!priv)
1994 return NULL;
1995 INIT_LIST_HEAD(&priv->list);
1996 priv->iscsi_transport = tt;
1997 priv->t.user_scan = iscsi_user_scan;
1998 priv->t.create_work_queue = 1;
1999
2000 priv->dev.class = &iscsi_transport_class;
2001 dev_set_name(&priv->dev, "%s", tt->name);
2002 err = device_register(&priv->dev);
2003 if (err)
2004 goto free_priv;
2005
2006 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2007 if (err)
2008 goto unregister_dev;
2009
2010 /* host parameters */
2011 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2012 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2013 priv->t.host_attrs.ac.match = iscsi_host_match;
2014 priv->t.host_size = sizeof(struct iscsi_cls_host);
2015 transport_container_register(&priv->t.host_attrs);
2016
2017 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
2018 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
2019 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
2020 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
2021 BUG_ON(count > ISCSI_HOST_ATTRS);
2022 priv->host_attrs[count] = NULL;
2023 count = 0;
2024
2025 /* connection parameters */
2026 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
2027 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2028 priv->conn_cont.ac.match = iscsi_conn_match;
2029 transport_container_register(&priv->conn_cont);
2030
2031 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
2032 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
2033 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
2034 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
2035 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
2036 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
2037 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
2038 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
2039 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
2040 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
2041 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
2042 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
2043 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
2044
2045 BUG_ON(count > ISCSI_CONN_ATTRS);
2046 priv->conn_attrs[count] = NULL;
2047 count = 0;
2048
2049 /* session parameters */
2050 priv->session_cont.ac.attrs = &priv->session_attrs[0];
2051 priv->session_cont.ac.class = &iscsi_session_class.class;
2052 priv->session_cont.ac.match = iscsi_session_match;
2053 transport_container_register(&priv->session_cont);
2054
2055 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
2056 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
2057 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
2058 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
2059 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
2060 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
2061 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
2062 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
2063 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
2064 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
2065 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2066 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2067 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2068 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2069 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2070 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2071 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2072 SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
2073 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2074 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2075 SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
2076 SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
2077 SETUP_PRIV_SESSION_RD_ATTR(state);
2078
2079 BUG_ON(count > ISCSI_SESSION_ATTRS);
2080 priv->session_attrs[count] = NULL;
2081
2082 spin_lock_irqsave(&iscsi_transport_lock, flags);
2083 list_add(&priv->list, &iscsi_transports);
2084 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2085
2086 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2087 return &priv->t;
2088
2089 unregister_dev:
2090 device_unregister(&priv->dev);
2091 return NULL;
2092 free_priv:
2093 kfree(priv);
2094 return NULL;
2095 }
2096 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2097
2098 int iscsi_unregister_transport(struct iscsi_transport *tt)
2099 {
2100 struct iscsi_internal *priv;
2101 unsigned long flags;
2102
2103 BUG_ON(!tt);
2104
2105 mutex_lock(&rx_queue_mutex);
2106
2107 priv = iscsi_if_transport_lookup(tt);
2108 BUG_ON (!priv);
2109
2110 spin_lock_irqsave(&iscsi_transport_lock, flags);
2111 list_del(&priv->list);
2112 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2113
2114 transport_container_unregister(&priv->conn_cont);
2115 transport_container_unregister(&priv->session_cont);
2116 transport_container_unregister(&priv->t.host_attrs);
2117
2118 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2119 device_unregister(&priv->dev);
2120 mutex_unlock(&rx_queue_mutex);
2121
2122 return 0;
2123 }
2124 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2125
2126 static __init int iscsi_transport_init(void)
2127 {
2128 int err;
2129
2130 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2131 ISCSI_TRANSPORT_VERSION);
2132
2133 atomic_set(&iscsi_session_nr, 0);
2134
2135 err = class_register(&iscsi_transport_class);
2136 if (err)
2137 return err;
2138
2139 err = class_register(&iscsi_endpoint_class);
2140 if (err)
2141 goto unregister_transport_class;
2142
2143 err = transport_class_register(&iscsi_host_class);
2144 if (err)
2145 goto unregister_endpoint_class;
2146
2147 err = transport_class_register(&iscsi_connection_class);
2148 if (err)
2149 goto unregister_host_class;
2150
2151 err = transport_class_register(&iscsi_session_class);
2152 if (err)
2153 goto unregister_conn_class;
2154
2155 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2156 NULL, THIS_MODULE);
2157 if (!nls) {
2158 err = -ENOBUFS;
2159 goto unregister_session_class;
2160 }
2161
2162 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2163 if (!iscsi_eh_timer_workq)
2164 goto release_nls;
2165
2166 return 0;
2167
2168 release_nls:
2169 netlink_kernel_release(nls);
2170 unregister_session_class:
2171 transport_class_unregister(&iscsi_session_class);
2172 unregister_conn_class:
2173 transport_class_unregister(&iscsi_connection_class);
2174 unregister_host_class:
2175 transport_class_unregister(&iscsi_host_class);
2176 unregister_endpoint_class:
2177 class_unregister(&iscsi_endpoint_class);
2178 unregister_transport_class:
2179 class_unregister(&iscsi_transport_class);
2180 return err;
2181 }
2182
2183 static void __exit iscsi_transport_exit(void)
2184 {
2185 destroy_workqueue(iscsi_eh_timer_workq);
2186 netlink_kernel_release(nls);
2187 transport_class_unregister(&iscsi_connection_class);
2188 transport_class_unregister(&iscsi_session_class);
2189 transport_class_unregister(&iscsi_host_class);
2190 class_unregister(&iscsi_endpoint_class);
2191 class_unregister(&iscsi_transport_class);
2192 }
2193
2194 module_init(iscsi_transport_init);
2195 module_exit(iscsi_transport_exit);
2196
2197 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2198 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2199 "Alex Aizman <itn780@yahoo.com>");
2200 MODULE_DESCRIPTION("iSCSI Transport Interface");
2201 MODULE_LICENSE("GPL");
2202 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2203 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
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