projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[SCSI] iscsi class, iscsi_tcp/iser: add host arg to session creation
[deliverable/linux.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 <net/tcp.h>
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_host.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/scsi_transport.h>
30 #include <scsi/scsi_transport_iscsi.h>
31 #include <scsi/iscsi_if.h>
32
33 #define ISCSI_SESSION_ATTRS 19
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
36 #define ISCSI_TRANSPORT_VERSION "2.0-869"
37
38 struct iscsi_internal {
39 int daemon_pid;
40 struct scsi_transport_template t;
41 struct iscsi_transport *iscsi_transport;
42 struct list_head list;
43 struct device dev;
44
45 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
50 };
51
52 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
53 static struct workqueue_struct *iscsi_eh_timer_workq;
54
55 /*
56 * list of registered transports and lock that must
57 * be held while accessing list. The iscsi_transport_lock must
58 * be acquired after the rx_queue_mutex.
59 */
60 static LIST_HEAD(iscsi_transports);
61 static DEFINE_SPINLOCK(iscsi_transport_lock);
62
63 #define to_iscsi_internal(tmpl) \
64 container_of(tmpl, struct iscsi_internal, t)
65
66 #define dev_to_iscsi_internal(_dev) \
67 container_of(_dev, struct iscsi_internal, dev)
68
69 static void iscsi_transport_release(struct device *dev)
70 {
71 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
72 kfree(priv);
73 }
74
75 /*
76 * iscsi_transport_class represents the iscsi_transports that are
77 * registered.
78 */
79 static struct class iscsi_transport_class = {
80 .name = "iscsi_transport",
81 .dev_release = iscsi_transport_release,
82 };
83
84 static ssize_t
85 show_transport_handle(struct device *dev, struct device_attribute *attr,
86 char *buf)
87 {
88 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
89 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
90 }
91 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
92
93 #define show_transport_attr(name, format) \
94 static ssize_t \
95 show_transport_##name(struct device *dev, \
96 struct device_attribute *attr,char *buf) \
97 { \
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
99 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
100 } \
101 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
102
103 show_transport_attr(caps, "0x%x");
104 show_transport_attr(max_lun, "%d");
105 show_transport_attr(max_conn, "%d");
106 show_transport_attr(max_cmd_len, "%d");
107
108 static struct attribute *iscsi_transport_attrs[] = {
109 &dev_attr_handle.attr,
110 &dev_attr_caps.attr,
111 &dev_attr_max_lun.attr,
112 &dev_attr_max_conn.attr,
113 &dev_attr_max_cmd_len.attr,
114 NULL,
115 };
116
117 static struct attribute_group iscsi_transport_group = {
118 .attrs = iscsi_transport_attrs,
119 };
120
121
122
123 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
124 struct device *cdev)
125 {
126 struct Scsi_Host *shost = dev_to_shost(dev);
127 struct iscsi_host *ihost = shost->shost_data;
128
129 memset(ihost, 0, sizeof(*ihost));
130 INIT_LIST_HEAD(&ihost->sessions);
131 mutex_init(&ihost->mutex);
132 atomic_set(&ihost->nr_scans, 0);
133
134 snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
135 shost->host_no);
136 ihost->scan_workq = create_singlethread_workqueue(
137 ihost->scan_workq_name);
138 if (!ihost->scan_workq)
139 return -ENOMEM;
140 return 0;
141 }
142
143 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
144 struct device *cdev)
145 {
146 struct Scsi_Host *shost = dev_to_shost(dev);
147 struct iscsi_host *ihost = shost->shost_data;
148
149 destroy_workqueue(ihost->scan_workq);
150 return 0;
151 }
152
153 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
154 "iscsi_host",
155 iscsi_setup_host,
156 iscsi_remove_host,
157 NULL);
158
159 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
160 "iscsi_session",
161 NULL,
162 NULL,
163 NULL);
164
165 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
166 "iscsi_connection",
167 NULL,
168 NULL,
169 NULL);
170
171 static struct sock *nls;
172 static DEFINE_MUTEX(rx_queue_mutex);
173
174 static LIST_HEAD(sesslist);
175 static DEFINE_SPINLOCK(sesslock);
176 static LIST_HEAD(connlist);
177 static DEFINE_SPINLOCK(connlock);
178
179 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
180 {
181 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
182 return sess->sid;
183 }
184
185 /*
186 * Returns the matching session to a given sid
187 */
188 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
189 {
190 unsigned long flags;
191 struct iscsi_cls_session *sess;
192
193 spin_lock_irqsave(&sesslock, flags);
194 list_for_each_entry(sess, &sesslist, sess_list) {
195 if (sess->sid == sid) {
196 spin_unlock_irqrestore(&sesslock, flags);
197 return sess;
198 }
199 }
200 spin_unlock_irqrestore(&sesslock, flags);
201 return NULL;
202 }
203
204 /*
205 * Returns the matching connection to a given sid / cid tuple
206 */
207 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
208 {
209 unsigned long flags;
210 struct iscsi_cls_conn *conn;
211
212 spin_lock_irqsave(&connlock, flags);
213 list_for_each_entry(conn, &connlist, conn_list) {
214 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
215 spin_unlock_irqrestore(&connlock, flags);
216 return conn;
217 }
218 }
219 spin_unlock_irqrestore(&connlock, flags);
220 return NULL;
221 }
222
223 /*
224 * The following functions can be used by LLDs that allocate
225 * their own scsi_hosts or by software iscsi LLDs
226 */
227 static struct {
228 int value;
229 char *name;
230 } iscsi_session_state_names[] = {
231 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
232 { ISCSI_SESSION_FAILED, "FAILED" },
233 { ISCSI_SESSION_FREE, "FREE" },
234 };
235
236 static const char *iscsi_session_state_name(int state)
237 {
238 int i;
239 char *name = NULL;
240
241 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
242 if (iscsi_session_state_names[i].value == state) {
243 name = iscsi_session_state_names[i].name;
244 break;
245 }
246 }
247 return name;
248 }
249
250 int iscsi_session_chkready(struct iscsi_cls_session *session)
251 {
252 unsigned long flags;
253 int err;
254
255 spin_lock_irqsave(&session->lock, flags);
256 switch (session->state) {
257 case ISCSI_SESSION_LOGGED_IN:
258 err = 0;
259 break;
260 case ISCSI_SESSION_FAILED:
261 err = DID_IMM_RETRY << 16;
262 break;
263 case ISCSI_SESSION_FREE:
264 err = DID_NO_CONNECT << 16;
265 break;
266 default:
267 err = DID_NO_CONNECT << 16;
268 break;
269 }
270 spin_unlock_irqrestore(&session->lock, flags);
271 return err;
272 }
273 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
274
275 static void iscsi_session_release(struct device *dev)
276 {
277 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
278 struct Scsi_Host *shost;
279
280 shost = iscsi_session_to_shost(session);
281 scsi_host_put(shost);
282 kfree(session);
283 }
284
285 static int iscsi_is_session_dev(const struct device *dev)
286 {
287 return dev->release == iscsi_session_release;
288 }
289
290 /**
291 * iscsi_scan_finished - helper to report when running scans are done
292 * @shost: scsi host
293 * @time: scan run time
294 *
295 * This function can be used by drives like qla4xxx to report to the scsi
296 * layer when the scans it kicked off at module load time are done.
297 */
298 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
299 {
300 struct iscsi_host *ihost = shost->shost_data;
301 /*
302 * qla4xxx will have kicked off some session unblocks before calling
303 * scsi_scan_host, so just wait for them to complete.
304 */
305 return !atomic_read(&ihost->nr_scans);
306 }
307 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
308
309 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
310 uint id, uint lun)
311 {
312 struct iscsi_host *ihost = shost->shost_data;
313 struct iscsi_cls_session *session;
314
315 mutex_lock(&ihost->mutex);
316 list_for_each_entry(session, &ihost->sessions, host_list) {
317 if ((channel == SCAN_WILD_CARD || channel == 0) &&
318 (id == SCAN_WILD_CARD || id == session->target_id))
319 scsi_scan_target(&session->dev, 0,
320 session->target_id, lun, 1);
321 }
322 mutex_unlock(&ihost->mutex);
323
324 return 0;
325 }
326
327 static void iscsi_scan_session(struct work_struct *work)
328 {
329 struct iscsi_cls_session *session =
330 container_of(work, struct iscsi_cls_session, scan_work);
331 struct Scsi_Host *shost = iscsi_session_to_shost(session);
332 struct iscsi_host *ihost = shost->shost_data;
333 unsigned long flags;
334
335 spin_lock_irqsave(&session->lock, flags);
336 if (session->state != ISCSI_SESSION_LOGGED_IN) {
337 spin_unlock_irqrestore(&session->lock, flags);
338 goto done;
339 }
340 spin_unlock_irqrestore(&session->lock, flags);
341
342 scsi_scan_target(&session->dev, 0, session->target_id,
343 SCAN_WILD_CARD, 1);
344 done:
345 atomic_dec(&ihost->nr_scans);
346 }
347
348 static void session_recovery_timedout(struct work_struct *work)
349 {
350 struct iscsi_cls_session *session =
351 container_of(work, struct iscsi_cls_session,
352 recovery_work.work);
353 unsigned long flags;
354
355 iscsi_cls_session_printk(KERN_INFO, session,
356 "session recovery timed out after %d secs\n",
357 session->recovery_tmo);
358
359 spin_lock_irqsave(&session->lock, flags);
360 switch (session->state) {
361 case ISCSI_SESSION_FAILED:
362 session->state = ISCSI_SESSION_FREE;
363 break;
364 case ISCSI_SESSION_LOGGED_IN:
365 case ISCSI_SESSION_FREE:
366 /* we raced with the unblock's flush */
367 spin_unlock_irqrestore(&session->lock, flags);
368 return;
369 }
370 spin_unlock_irqrestore(&session->lock, flags);
371
372 if (session->transport->session_recovery_timedout)
373 session->transport->session_recovery_timedout(session);
374
375 scsi_target_unblock(&session->dev);
376 }
377
378 static void __iscsi_unblock_session(struct work_struct *work)
379 {
380 struct iscsi_cls_session *session =
381 container_of(work, struct iscsi_cls_session,
382 unblock_work);
383 struct Scsi_Host *shost = iscsi_session_to_shost(session);
384 struct iscsi_host *ihost = shost->shost_data;
385 unsigned long flags;
386
387 /*
388 * The recovery and unblock work get run from the same workqueue,
389 * so try to cancel it if it was going to run after this unblock.
390 */
391 cancel_delayed_work(&session->recovery_work);
392 spin_lock_irqsave(&session->lock, flags);
393 session->state = ISCSI_SESSION_LOGGED_IN;
394 spin_unlock_irqrestore(&session->lock, flags);
395 /* start IO */
396 scsi_target_unblock(&session->dev);
397 /*
398 * Only do kernel scanning if the driver is properly hooked into
399 * the async scanning code (drivers like iscsi_tcp do login and
400 * scanning from userspace).
401 */
402 if (shost->hostt->scan_finished) {
403 if (queue_work(ihost->scan_workq, &session->scan_work))
404 atomic_inc(&ihost->nr_scans);
405 }
406 }
407
408 /**
409 * iscsi_unblock_session - set a session as logged in and start IO.
410 * @session: iscsi session
411 *
412 * Mark a session as ready to accept IO.
413 */
414 void iscsi_unblock_session(struct iscsi_cls_session *session)
415 {
416 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
417 /*
418 * make sure all the events have completed before tell the driver
419 * it is safe
420 */
421 flush_workqueue(iscsi_eh_timer_workq);
422 }
423 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
424
425 static void __iscsi_block_session(struct work_struct *work)
426 {
427 struct iscsi_cls_session *session =
428 container_of(work, struct iscsi_cls_session,
429 block_work);
430 unsigned long flags;
431
432 spin_lock_irqsave(&session->lock, flags);
433 session->state = ISCSI_SESSION_FAILED;
434 spin_unlock_irqrestore(&session->lock, flags);
435 scsi_target_block(&session->dev);
436 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
437 session->recovery_tmo * HZ);
438 }
439
440 void iscsi_block_session(struct iscsi_cls_session *session)
441 {
442 queue_work(iscsi_eh_timer_workq, &session->block_work);
443 }
444 EXPORT_SYMBOL_GPL(iscsi_block_session);
445
446 static void __iscsi_unbind_session(struct work_struct *work)
447 {
448 struct iscsi_cls_session *session =
449 container_of(work, struct iscsi_cls_session,
450 unbind_work);
451 struct Scsi_Host *shost = iscsi_session_to_shost(session);
452 struct iscsi_host *ihost = shost->shost_data;
453
454 /* Prevent new scans and make sure scanning is not in progress */
455 mutex_lock(&ihost->mutex);
456 if (list_empty(&session->host_list)) {
457 mutex_unlock(&ihost->mutex);
458 return;
459 }
460 list_del_init(&session->host_list);
461 mutex_unlock(&ihost->mutex);
462
463 scsi_remove_target(&session->dev);
464 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
465 }
466
467 static int iscsi_unbind_session(struct iscsi_cls_session *session)
468 {
469 struct Scsi_Host *shost = iscsi_session_to_shost(session);
470 struct iscsi_host *ihost = shost->shost_data;
471
472 return queue_work(ihost->scan_workq, &session->unbind_work);
473 }
474
475 struct iscsi_cls_session *
476 iscsi_alloc_session(struct Scsi_Host *shost,
477 struct iscsi_transport *transport)
478 {
479 struct iscsi_cls_session *session;
480
481 session = kzalloc(sizeof(*session) + transport->sessiondata_size,
482 GFP_KERNEL);
483 if (!session)
484 return NULL;
485
486 session->transport = transport;
487 session->recovery_tmo = 120;
488 session->state = ISCSI_SESSION_FREE;
489 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
490 INIT_LIST_HEAD(&session->host_list);
491 INIT_LIST_HEAD(&session->sess_list);
492 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
493 INIT_WORK(&session->block_work, __iscsi_block_session);
494 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
495 INIT_WORK(&session->scan_work, iscsi_scan_session);
496 spin_lock_init(&session->lock);
497
498 /* this is released in the dev's release function */
499 scsi_host_get(shost);
500 session->dev.parent = &shost->shost_gendev;
501 session->dev.release = iscsi_session_release;
502 device_initialize(&session->dev);
503 if (transport->sessiondata_size)
504 session->dd_data = &session[1];
505 return session;
506 }
507 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
508
509 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
510 {
511 struct Scsi_Host *shost = iscsi_session_to_shost(session);
512 struct iscsi_host *ihost;
513 unsigned long flags;
514 int err;
515
516 ihost = shost->shost_data;
517 session->sid = atomic_add_return(1, &iscsi_session_nr);
518 session->target_id = target_id;
519
520 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
521 session->sid);
522 err = device_add(&session->dev);
523 if (err) {
524 iscsi_cls_session_printk(KERN_ERR, session,
525 "could not register session's dev\n");
526 goto release_host;
527 }
528 transport_register_device(&session->dev);
529
530 spin_lock_irqsave(&sesslock, flags);
531 list_add(&session->sess_list, &sesslist);
532 spin_unlock_irqrestore(&sesslock, flags);
533
534 mutex_lock(&ihost->mutex);
535 list_add(&session->host_list, &ihost->sessions);
536 mutex_unlock(&ihost->mutex);
537
538 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
539 return 0;
540
541 release_host:
542 scsi_host_put(shost);
543 return err;
544 }
545 EXPORT_SYMBOL_GPL(iscsi_add_session);
546
547 /**
548 * iscsi_create_session - create iscsi class session
549 * @shost: scsi host
550 * @transport: iscsi transport
551 * @target_id: which target
552 *
553 * This can be called from a LLD or iscsi_transport.
554 */
555 struct iscsi_cls_session *
556 iscsi_create_session(struct Scsi_Host *shost,
557 struct iscsi_transport *transport,
558 unsigned int target_id)
559 {
560 struct iscsi_cls_session *session;
561
562 session = iscsi_alloc_session(shost, transport);
563 if (!session)
564 return NULL;
565
566 if (iscsi_add_session(session, target_id)) {
567 iscsi_free_session(session);
568 return NULL;
569 }
570 return session;
571 }
572 EXPORT_SYMBOL_GPL(iscsi_create_session);
573
574 static void iscsi_conn_release(struct device *dev)
575 {
576 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
577 struct device *parent = conn->dev.parent;
578
579 kfree(conn);
580 put_device(parent);
581 }
582
583 static int iscsi_is_conn_dev(const struct device *dev)
584 {
585 return dev->release == iscsi_conn_release;
586 }
587
588 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
589 {
590 if (!iscsi_is_conn_dev(dev))
591 return 0;
592 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
593 }
594
595 void iscsi_remove_session(struct iscsi_cls_session *session)
596 {
597 struct Scsi_Host *shost = iscsi_session_to_shost(session);
598 struct iscsi_host *ihost = shost->shost_data;
599 unsigned long flags;
600 int err;
601
602 spin_lock_irqsave(&sesslock, flags);
603 list_del(&session->sess_list);
604 spin_unlock_irqrestore(&sesslock, flags);
605
606 /* make sure there are no blocks/unblocks queued */
607 flush_workqueue(iscsi_eh_timer_workq);
608 /* make sure the timedout callout is not running */
609 if (!cancel_delayed_work(&session->recovery_work))
610 flush_workqueue(iscsi_eh_timer_workq);
611 /*
612 * If we are blocked let commands flow again. The lld or iscsi
613 * layer should set up the queuecommand to fail commands.
614 * We assume that LLD will not be calling block/unblock while
615 * removing the session.
616 */
617 spin_lock_irqsave(&session->lock, flags);
618 session->state = ISCSI_SESSION_FREE;
619 spin_unlock_irqrestore(&session->lock, flags);
620
621 scsi_target_unblock(&session->dev);
622 /* flush running scans then delete devices */
623 flush_workqueue(ihost->scan_workq);
624 __iscsi_unbind_session(&session->unbind_work);
625
626 /* hw iscsi may not have removed all connections from session */
627 err = device_for_each_child(&session->dev, NULL,
628 iscsi_iter_destroy_conn_fn);
629 if (err)
630 iscsi_cls_session_printk(KERN_ERR, session,
631 "Could not delete all connections "
632 "for session. Error %d.\n", err);
633
634 transport_unregister_device(&session->dev);
635 device_del(&session->dev);
636 }
637 EXPORT_SYMBOL_GPL(iscsi_remove_session);
638
639 void iscsi_free_session(struct iscsi_cls_session *session)
640 {
641 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
642 put_device(&session->dev);
643 }
644 EXPORT_SYMBOL_GPL(iscsi_free_session);
645
646 /**
647 * iscsi_destroy_session - destroy iscsi session
648 * @session: iscsi_session
649 *
650 * Can be called by a LLD or iscsi_transport. There must not be
651 * any running connections.
652 */
653 int iscsi_destroy_session(struct iscsi_cls_session *session)
654 {
655 iscsi_remove_session(session);
656 iscsi_free_session(session);
657 return 0;
658 }
659 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
660
661 /**
662 * iscsi_create_conn - create iscsi class connection
663 * @session: iscsi cls session
664 * @cid: connection id
665 *
666 * This can be called from a LLD or iscsi_transport. The connection
667 * is child of the session so cid must be unique for all connections
668 * on the session.
669 *
670 * Since we do not support MCS, cid will normally be zero. In some cases
671 * for software iscsi we could be trying to preallocate a connection struct
672 * in which case there could be two connection structs and cid would be
673 * non-zero.
674 */
675 struct iscsi_cls_conn *
676 iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
677 {
678 struct iscsi_transport *transport = session->transport;
679 struct iscsi_cls_conn *conn;
680 unsigned long flags;
681 int err;
682
683 conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
684 if (!conn)
685 return NULL;
686
687 if (transport->conndata_size)
688 conn->dd_data = &conn[1];
689
690 INIT_LIST_HEAD(&conn->conn_list);
691 conn->transport = transport;
692 conn->cid = cid;
693
694 /* this is released in the dev's release function */
695 if (!get_device(&session->dev))
696 goto free_conn;
697
698 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
699 session->sid, cid);
700 conn->dev.parent = &session->dev;
701 conn->dev.release = iscsi_conn_release;
702 err = device_register(&conn->dev);
703 if (err) {
704 iscsi_cls_session_printk(KERN_ERR, session, "could not "
705 "register connection's dev\n");
706 goto release_parent_ref;
707 }
708 transport_register_device(&conn->dev);
709
710 spin_lock_irqsave(&connlock, flags);
711 list_add(&conn->conn_list, &connlist);
712 conn->active = 1;
713 spin_unlock_irqrestore(&connlock, flags);
714 return conn;
715
716 release_parent_ref:
717 put_device(&session->dev);
718 free_conn:
719 kfree(conn);
720 return NULL;
721 }
722
723 EXPORT_SYMBOL_GPL(iscsi_create_conn);
724
725 /**
726 * iscsi_destroy_conn - destroy iscsi class connection
727 * @conn: iscsi cls session
728 *
729 * This can be called from a LLD or iscsi_transport.
730 */
731 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
732 {
733 unsigned long flags;
734
735 spin_lock_irqsave(&connlock, flags);
736 conn->active = 0;
737 list_del(&conn->conn_list);
738 spin_unlock_irqrestore(&connlock, flags);
739
740 transport_unregister_device(&conn->dev);
741 device_unregister(&conn->dev);
742 return 0;
743 }
744 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
745
746 /*
747 * iscsi interface functions
748 */
749 static struct iscsi_internal *
750 iscsi_if_transport_lookup(struct iscsi_transport *tt)
751 {
752 struct iscsi_internal *priv;
753 unsigned long flags;
754
755 spin_lock_irqsave(&iscsi_transport_lock, flags);
756 list_for_each_entry(priv, &iscsi_transports, list) {
757 if (tt == priv->iscsi_transport) {
758 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
759 return priv;
760 }
761 }
762 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
763 return NULL;
764 }
765
766 static int
767 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
768 {
769 int rc;
770
771 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
772 if (rc < 0) {
773 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
774 return rc;
775 }
776
777 return 0;
778 }
779
780 static int
781 iscsi_unicast_skb(struct sk_buff *skb, int pid)
782 {
783 int rc;
784
785 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
786 if (rc < 0) {
787 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
788 return rc;
789 }
790
791 return 0;
792 }
793
794 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
795 char *data, uint32_t data_size)
796 {
797 struct nlmsghdr *nlh;
798 struct sk_buff *skb;
799 struct iscsi_uevent *ev;
800 char *pdu;
801 struct iscsi_internal *priv;
802 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
803 data_size);
804
805 priv = iscsi_if_transport_lookup(conn->transport);
806 if (!priv)
807 return -EINVAL;
808
809 skb = alloc_skb(len, GFP_ATOMIC);
810 if (!skb) {
811 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
812 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
813 "control PDU: OOM\n");
814 return -ENOMEM;
815 }
816
817 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
818 ev = NLMSG_DATA(nlh);
819 memset(ev, 0, sizeof(*ev));
820 ev->transport_handle = iscsi_handle(conn->transport);
821 ev->type = ISCSI_KEVENT_RECV_PDU;
822 ev->r.recv_req.cid = conn->cid;
823 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
824 pdu = (char*)ev + sizeof(*ev);
825 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
826 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
827
828 return iscsi_unicast_skb(skb, priv->daemon_pid);
829 }
830 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
831
832 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
833 {
834 struct nlmsghdr *nlh;
835 struct sk_buff *skb;
836 struct iscsi_uevent *ev;
837 struct iscsi_internal *priv;
838 int len = NLMSG_SPACE(sizeof(*ev));
839
840 priv = iscsi_if_transport_lookup(conn->transport);
841 if (!priv)
842 return;
843
844 skb = alloc_skb(len, GFP_ATOMIC);
845 if (!skb) {
846 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
847 "conn error (%d)\n", error);
848 return;
849 }
850
851 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
852 ev = NLMSG_DATA(nlh);
853 ev->transport_handle = iscsi_handle(conn->transport);
854 ev->type = ISCSI_KEVENT_CONN_ERROR;
855 ev->r.connerror.error = error;
856 ev->r.connerror.cid = conn->cid;
857 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
858
859 iscsi_broadcast_skb(skb, GFP_ATOMIC);
860
861 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
862 error);
863 }
864 EXPORT_SYMBOL_GPL(iscsi_conn_error);
865
866 static int
867 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
868 void *payload, int size)
869 {
870 struct sk_buff *skb;
871 struct nlmsghdr *nlh;
872 int len = NLMSG_SPACE(size);
873 int flags = multi ? NLM_F_MULTI : 0;
874 int t = done ? NLMSG_DONE : type;
875
876 skb = alloc_skb(len, GFP_ATOMIC);
877 if (!skb) {
878 printk(KERN_ERR "Could not allocate skb to send reply.\n");
879 return -ENOMEM;
880 }
881
882 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
883 nlh->nlmsg_flags = flags;
884 memcpy(NLMSG_DATA(nlh), payload, size);
885 return iscsi_unicast_skb(skb, pid);
886 }
887
888 static int
889 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
890 {
891 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
892 struct iscsi_stats *stats;
893 struct sk_buff *skbstat;
894 struct iscsi_cls_conn *conn;
895 struct nlmsghdr *nlhstat;
896 struct iscsi_uevent *evstat;
897 struct iscsi_internal *priv;
898 int len = NLMSG_SPACE(sizeof(*ev) +
899 sizeof(struct iscsi_stats) +
900 sizeof(struct iscsi_stats_custom) *
901 ISCSI_STATS_CUSTOM_MAX);
902 int err = 0;
903
904 priv = iscsi_if_transport_lookup(transport);
905 if (!priv)
906 return -EINVAL;
907
908 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
909 if (!conn)
910 return -EEXIST;
911
912 do {
913 int actual_size;
914
915 skbstat = alloc_skb(len, GFP_ATOMIC);
916 if (!skbstat) {
917 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
918 "deliver stats: OOM\n");
919 return -ENOMEM;
920 }
921
922 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
923 (len - sizeof(*nlhstat)), 0);
924 evstat = NLMSG_DATA(nlhstat);
925 memset(evstat, 0, sizeof(*evstat));
926 evstat->transport_handle = iscsi_handle(conn->transport);
927 evstat->type = nlh->nlmsg_type;
928 evstat->u.get_stats.cid =
929 ev->u.get_stats.cid;
930 evstat->u.get_stats.sid =
931 ev->u.get_stats.sid;
932 stats = (struct iscsi_stats *)
933 ((char*)evstat + sizeof(*evstat));
934 memset(stats, 0, sizeof(*stats));
935
936 transport->get_stats(conn, stats);
937 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
938 sizeof(struct iscsi_stats) +
939 sizeof(struct iscsi_stats_custom) *
940 stats->custom_length);
941 actual_size -= sizeof(*nlhstat);
942 actual_size = NLMSG_LENGTH(actual_size);
943 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
944 nlhstat->nlmsg_len = actual_size;
945
946 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
947 } while (err < 0 && err != -ECONNREFUSED);
948
949 return err;
950 }
951
952 /**
953 * iscsi_session_event - send session destr. completion event
954 * @session: iscsi class session
955 * @event: type of event
956 */
957 int iscsi_session_event(struct iscsi_cls_session *session,
958 enum iscsi_uevent_e event)
959 {
960 struct iscsi_internal *priv;
961 struct Scsi_Host *shost;
962 struct iscsi_uevent *ev;
963 struct sk_buff *skb;
964 struct nlmsghdr *nlh;
965 int rc, len = NLMSG_SPACE(sizeof(*ev));
966
967 priv = iscsi_if_transport_lookup(session->transport);
968 if (!priv)
969 return -EINVAL;
970 shost = iscsi_session_to_shost(session);
971
972 skb = alloc_skb(len, GFP_KERNEL);
973 if (!skb) {
974 iscsi_cls_session_printk(KERN_ERR, session,
975 "Cannot notify userspace of session "
976 "event %u\n", event);
977 return -ENOMEM;
978 }
979
980 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
981 ev = NLMSG_DATA(nlh);
982 ev->transport_handle = iscsi_handle(session->transport);
983
984 ev->type = event;
985 switch (event) {
986 case ISCSI_KEVENT_DESTROY_SESSION:
987 ev->r.d_session.host_no = shost->host_no;
988 ev->r.d_session.sid = session->sid;
989 break;
990 case ISCSI_KEVENT_CREATE_SESSION:
991 ev->r.c_session_ret.host_no = shost->host_no;
992 ev->r.c_session_ret.sid = session->sid;
993 break;
994 case ISCSI_KEVENT_UNBIND_SESSION:
995 ev->r.unbind_session.host_no = shost->host_no;
996 ev->r.unbind_session.sid = session->sid;
997 break;
998 default:
999 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1000 "%u.\n", event);
1001 kfree_skb(skb);
1002 return -EINVAL;
1003 }
1004
1005 /*
1006 * this will occur if the daemon is not up, so we just warn
1007 * the user and when the daemon is restarted it will handle it
1008 */
1009 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1010 if (rc < 0)
1011 iscsi_cls_session_printk(KERN_ERR, session,
1012 "Cannot notify userspace of session "
1013 "event %u. Check iscsi daemon\n",
1014 event);
1015 return rc;
1016 }
1017 EXPORT_SYMBOL_GPL(iscsi_session_event);
1018
1019 static int
1020 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev,
1021 uint32_t host_no, uint32_t initial_cmdsn,
1022 uint16_t cmds_max, uint16_t queue_depth)
1023 {
1024 struct iscsi_transport *transport = priv->iscsi_transport;
1025 struct iscsi_cls_session *session;
1026 struct Scsi_Host *shost = NULL;
1027
1028 /*
1029 * Software iscsi allocates a host per session, but
1030 * offload drivers (and possibly iser one day) allocate a host per
1031 * hba/nic/rnic. Offload will match a host here, but software will
1032 * return a new hostno after the create_session callback has returned.
1033 */
1034 if (host_no != UINT_MAX) {
1035 shost = scsi_host_lookup(host_no);
1036 if (IS_ERR(shost)) {
1037 printk(KERN_ERR "Could not find host no %u to "
1038 "create session\n", host_no);
1039 return -ENODEV;
1040 }
1041 }
1042
1043 session = transport->create_session(transport, &priv->t, shost,
1044 cmds_max, queue_depth,
1045 initial_cmdsn, &host_no);
1046 if (shost)
1047 scsi_host_put(shost);
1048 if (!session)
1049 return -ENOMEM;
1050
1051 ev->r.c_session_ret.host_no = host_no;
1052 ev->r.c_session_ret.sid = session->sid;
1053 return 0;
1054 }
1055
1056 static int
1057 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1058 {
1059 struct iscsi_cls_conn *conn;
1060 struct iscsi_cls_session *session;
1061
1062 session = iscsi_session_lookup(ev->u.c_conn.sid);
1063 if (!session) {
1064 printk(KERN_ERR "iscsi: invalid session %d.\n",
1065 ev->u.c_conn.sid);
1066 return -EINVAL;
1067 }
1068
1069 conn = transport->create_conn(session, ev->u.c_conn.cid);
1070 if (!conn) {
1071 iscsi_cls_session_printk(KERN_ERR, session,
1072 "couldn't create a new connection.");
1073 return -ENOMEM;
1074 }
1075
1076 ev->r.c_conn_ret.sid = session->sid;
1077 ev->r.c_conn_ret.cid = conn->cid;
1078 return 0;
1079 }
1080
1081 static int
1082 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1083 {
1084 struct iscsi_cls_conn *conn;
1085
1086 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1087 if (!conn)
1088 return -EINVAL;
1089
1090 if (transport->destroy_conn)
1091 transport->destroy_conn(conn);
1092 return 0;
1093 }
1094
1095 static int
1096 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1097 {
1098 char *data = (char*)ev + sizeof(*ev);
1099 struct iscsi_cls_conn *conn;
1100 struct iscsi_cls_session *session;
1101 int err = 0, value = 0;
1102
1103 session = iscsi_session_lookup(ev->u.set_param.sid);
1104 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1105 if (!conn || !session)
1106 return -EINVAL;
1107
1108 switch (ev->u.set_param.param) {
1109 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1110 sscanf(data, "%d", &value);
1111 if (value != 0)
1112 session->recovery_tmo = value;
1113 break;
1114 default:
1115 err = transport->set_param(conn, ev->u.set_param.param,
1116 data, ev->u.set_param.len);
1117 }
1118
1119 return err;
1120 }
1121
1122 static int
1123 iscsi_if_transport_ep(struct iscsi_transport *transport,
1124 struct iscsi_uevent *ev, int msg_type)
1125 {
1126 struct sockaddr *dst_addr;
1127 int rc = 0;
1128
1129 switch (msg_type) {
1130 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1131 if (!transport->ep_connect)
1132 return -EINVAL;
1133
1134 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1135 rc = transport->ep_connect(dst_addr,
1136 ev->u.ep_connect.non_blocking,
1137 &ev->r.ep_connect_ret.handle);
1138 break;
1139 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1140 if (!transport->ep_poll)
1141 return -EINVAL;
1142
1143 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
1144 ev->u.ep_poll.timeout_ms);
1145 break;
1146 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1147 if (!transport->ep_disconnect)
1148 return -EINVAL;
1149
1150 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
1151 break;
1152 }
1153 return rc;
1154 }
1155
1156 static int
1157 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1158 struct iscsi_uevent *ev)
1159 {
1160 struct Scsi_Host *shost;
1161 struct sockaddr *dst_addr;
1162 int err;
1163
1164 if (!transport->tgt_dscvr)
1165 return -EINVAL;
1166
1167 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1168 if (IS_ERR(shost)) {
1169 printk(KERN_ERR "target discovery could not find host no %u\n",
1170 ev->u.tgt_dscvr.host_no);
1171 return -ENODEV;
1172 }
1173
1174
1175 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1176 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1177 ev->u.tgt_dscvr.enable, dst_addr);
1178 scsi_host_put(shost);
1179 return err;
1180 }
1181
1182 static int
1183 iscsi_set_host_param(struct iscsi_transport *transport,
1184 struct iscsi_uevent *ev)
1185 {
1186 char *data = (char*)ev + sizeof(*ev);
1187 struct Scsi_Host *shost;
1188 int err;
1189
1190 if (!transport->set_host_param)
1191 return -ENOSYS;
1192
1193 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1194 if (IS_ERR(shost)) {
1195 printk(KERN_ERR "set_host_param could not find host no %u\n",
1196 ev->u.set_host_param.host_no);
1197 return -ENODEV;
1198 }
1199
1200 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1201 data, ev->u.set_host_param.len);
1202 scsi_host_put(shost);
1203 return err;
1204 }
1205
1206 static int
1207 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1208 {
1209 int err = 0;
1210 uint32_t host_no = UINT_MAX;
1211 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1212 struct iscsi_transport *transport = NULL;
1213 struct iscsi_internal *priv;
1214 struct iscsi_cls_session *session;
1215 struct iscsi_cls_conn *conn;
1216
1217 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1218 if (!priv)
1219 return -EINVAL;
1220 transport = priv->iscsi_transport;
1221
1222 if (!try_module_get(transport->owner))
1223 return -EINVAL;
1224
1225 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1226
1227 switch (nlh->nlmsg_type) {
1228 case ISCSI_UEVENT_CREATE_SESSION:
1229 err = iscsi_if_create_session(priv, ev, host_no,
1230 ev->u.c_session.initial_cmdsn,
1231 ev->u.c_session.cmds_max,
1232 ev->u.c_session.queue_depth);
1233 break;
1234 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1235 err = iscsi_if_create_session(priv, ev,
1236 ev->u.c_bound_session.host_no,
1237 ev->u.c_bound_session.initial_cmdsn,
1238 ev->u.c_bound_session.cmds_max,
1239 ev->u.c_bound_session.queue_depth);
1240 break;
1241 case ISCSI_UEVENT_DESTROY_SESSION:
1242 session = iscsi_session_lookup(ev->u.d_session.sid);
1243 if (session)
1244 transport->destroy_session(session);
1245 else
1246 err = -EINVAL;
1247 break;
1248 case ISCSI_UEVENT_UNBIND_SESSION:
1249 session = iscsi_session_lookup(ev->u.d_session.sid);
1250 if (session)
1251 iscsi_unbind_session(session);
1252 else
1253 err = -EINVAL;
1254 break;
1255 case ISCSI_UEVENT_CREATE_CONN:
1256 err = iscsi_if_create_conn(transport, ev);
1257 break;
1258 case ISCSI_UEVENT_DESTROY_CONN:
1259 err = iscsi_if_destroy_conn(transport, ev);
1260 break;
1261 case ISCSI_UEVENT_BIND_CONN:
1262 session = iscsi_session_lookup(ev->u.b_conn.sid);
1263 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1264
1265 if (session && conn)
1266 ev->r.retcode = transport->bind_conn(session, conn,
1267 ev->u.b_conn.transport_eph,
1268 ev->u.b_conn.is_leading);
1269 else
1270 err = -EINVAL;
1271 break;
1272 case ISCSI_UEVENT_SET_PARAM:
1273 err = iscsi_set_param(transport, ev);
1274 break;
1275 case ISCSI_UEVENT_START_CONN:
1276 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1277 if (conn)
1278 ev->r.retcode = transport->start_conn(conn);
1279 else
1280 err = -EINVAL;
1281 break;
1282 case ISCSI_UEVENT_STOP_CONN:
1283 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1284 if (conn)
1285 transport->stop_conn(conn, ev->u.stop_conn.flag);
1286 else
1287 err = -EINVAL;
1288 break;
1289 case ISCSI_UEVENT_SEND_PDU:
1290 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1291 if (conn)
1292 ev->r.retcode = transport->send_pdu(conn,
1293 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1294 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1295 ev->u.send_pdu.data_size);
1296 else
1297 err = -EINVAL;
1298 break;
1299 case ISCSI_UEVENT_GET_STATS:
1300 err = iscsi_if_get_stats(transport, nlh);
1301 break;
1302 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1303 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1304 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1305 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1306 break;
1307 case ISCSI_UEVENT_TGT_DSCVR:
1308 err = iscsi_tgt_dscvr(transport, ev);
1309 break;
1310 case ISCSI_UEVENT_SET_HOST_PARAM:
1311 err = iscsi_set_host_param(transport, ev);
1312 break;
1313 default:
1314 err = -ENOSYS;
1315 break;
1316 }
1317
1318 module_put(transport->owner);
1319 return err;
1320 }
1321
1322 /*
1323 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1324 * Malformed skbs with wrong lengths or invalid creds are not processed.
1325 */
1326 static void
1327 iscsi_if_rx(struct sk_buff *skb)
1328 {
1329 mutex_lock(&rx_queue_mutex);
1330 while (skb->len >= NLMSG_SPACE(0)) {
1331 int err;
1332 uint32_t rlen;
1333 struct nlmsghdr *nlh;
1334 struct iscsi_uevent *ev;
1335
1336 nlh = nlmsg_hdr(skb);
1337 if (nlh->nlmsg_len < sizeof(*nlh) ||
1338 skb->len < nlh->nlmsg_len) {
1339 break;
1340 }
1341
1342 ev = NLMSG_DATA(nlh);
1343 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1344 if (rlen > skb->len)
1345 rlen = skb->len;
1346
1347 err = iscsi_if_recv_msg(skb, nlh);
1348 if (err) {
1349 ev->type = ISCSI_KEVENT_IF_ERROR;
1350 ev->iferror = err;
1351 }
1352 do {
1353 /*
1354 * special case for GET_STATS:
1355 * on success - sending reply and stats from
1356 * inside of if_recv_msg(),
1357 * on error - fall through.
1358 */
1359 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1360 break;
1361 err = iscsi_if_send_reply(
1362 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1363 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1364 } while (err < 0 && err != -ECONNREFUSED);
1365 skb_pull(skb, rlen);
1366 }
1367 mutex_unlock(&rx_queue_mutex);
1368 }
1369
1370 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1371 struct device_attribute dev_attr_##_prefix##_##_name = \
1372 __ATTR(_name,_mode,_show,_store)
1373
1374 /*
1375 * iSCSI connection attrs
1376 */
1377 #define iscsi_conn_attr_show(param) \
1378 static ssize_t \
1379 show_conn_param_##param(struct device *dev, \
1380 struct device_attribute *attr, char *buf) \
1381 { \
1382 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1383 struct iscsi_transport *t = conn->transport; \
1384 return t->get_conn_param(conn, param, buf); \
1385 }
1386
1387 #define iscsi_conn_attr(field, param) \
1388 iscsi_conn_attr_show(param) \
1389 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1390 NULL);
1391
1392 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1393 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1394 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1395 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1396 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1397 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1398 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1399 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1400 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1401 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1402 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1403 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1404 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1405
1406 /*
1407 * iSCSI session attrs
1408 */
1409 #define iscsi_session_attr_show(param, perm) \
1410 static ssize_t \
1411 show_session_param_##param(struct device *dev, \
1412 struct device_attribute *attr, char *buf) \
1413 { \
1414 struct iscsi_cls_session *session = \
1415 iscsi_dev_to_session(dev->parent); \
1416 struct iscsi_transport *t = session->transport; \
1417 \
1418 if (perm && !capable(CAP_SYS_ADMIN)) \
1419 return -EACCES; \
1420 return t->get_session_param(session, param, buf); \
1421 }
1422
1423 #define iscsi_session_attr(field, param, perm) \
1424 iscsi_session_attr_show(param, perm) \
1425 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1426 NULL);
1427
1428 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1429 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1430 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1431 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1432 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1433 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1434 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1435 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1436 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1437 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1438 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1439 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1440 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1441 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1442 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1443 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1444 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1445
1446 static ssize_t
1447 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1448 char *buf)
1449 {
1450 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1451 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1452 }
1453 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1454 NULL);
1455
1456 #define iscsi_priv_session_attr_show(field, format) \
1457 static ssize_t \
1458 show_priv_session_##field(struct device *dev, \
1459 struct device_attribute *attr, char *buf) \
1460 { \
1461 struct iscsi_cls_session *session = \
1462 iscsi_dev_to_session(dev->parent); \
1463 return sprintf(buf, format"\n", session->field); \
1464 }
1465
1466 #define iscsi_priv_session_attr(field, format) \
1467 iscsi_priv_session_attr_show(field, format) \
1468 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1469 NULL)
1470 iscsi_priv_session_attr(recovery_tmo, "%d");
1471
1472 /*
1473 * iSCSI host attrs
1474 */
1475 #define iscsi_host_attr_show(param) \
1476 static ssize_t \
1477 show_host_param_##param(struct device *dev, \
1478 struct device_attribute *attr, char *buf) \
1479 { \
1480 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1481 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1482 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1483 }
1484
1485 #define iscsi_host_attr(field, param) \
1486 iscsi_host_attr_show(param) \
1487 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1488 NULL);
1489
1490 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1491 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1492 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1493 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1494
1495 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1496 do { \
1497 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1498 count++; \
1499 } while (0)
1500
1501
1502 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1503 do { \
1504 if (tt->param_mask & param_flag) { \
1505 priv->session_attrs[count] = &dev_attr_sess_##field; \
1506 count++; \
1507 } \
1508 } while (0)
1509
1510 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1511 do { \
1512 if (tt->param_mask & param_flag) { \
1513 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1514 count++; \
1515 } \
1516 } while (0)
1517
1518 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1519 do { \
1520 if (tt->host_param_mask & param_flag) { \
1521 priv->host_attrs[count] = &dev_attr_host_##field; \
1522 count++; \
1523 } \
1524 } while (0)
1525
1526 static int iscsi_session_match(struct attribute_container *cont,
1527 struct device *dev)
1528 {
1529 struct iscsi_cls_session *session;
1530 struct Scsi_Host *shost;
1531 struct iscsi_internal *priv;
1532
1533 if (!iscsi_is_session_dev(dev))
1534 return 0;
1535
1536 session = iscsi_dev_to_session(dev);
1537 shost = iscsi_session_to_shost(session);
1538 if (!shost->transportt)
1539 return 0;
1540
1541 priv = to_iscsi_internal(shost->transportt);
1542 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1543 return 0;
1544
1545 return &priv->session_cont.ac == cont;
1546 }
1547
1548 static int iscsi_conn_match(struct attribute_container *cont,
1549 struct device *dev)
1550 {
1551 struct iscsi_cls_session *session;
1552 struct iscsi_cls_conn *conn;
1553 struct Scsi_Host *shost;
1554 struct iscsi_internal *priv;
1555
1556 if (!iscsi_is_conn_dev(dev))
1557 return 0;
1558
1559 conn = iscsi_dev_to_conn(dev);
1560 session = iscsi_dev_to_session(conn->dev.parent);
1561 shost = iscsi_session_to_shost(session);
1562
1563 if (!shost->transportt)
1564 return 0;
1565
1566 priv = to_iscsi_internal(shost->transportt);
1567 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1568 return 0;
1569
1570 return &priv->conn_cont.ac == cont;
1571 }
1572
1573 static int iscsi_host_match(struct attribute_container *cont,
1574 struct device *dev)
1575 {
1576 struct Scsi_Host *shost;
1577 struct iscsi_internal *priv;
1578
1579 if (!scsi_is_host_device(dev))
1580 return 0;
1581
1582 shost = dev_to_shost(dev);
1583 if (!shost->transportt ||
1584 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1585 return 0;
1586
1587 priv = to_iscsi_internal(shost->transportt);
1588 return &priv->t.host_attrs.ac == cont;
1589 }
1590
1591 struct scsi_transport_template *
1592 iscsi_register_transport(struct iscsi_transport *tt)
1593 {
1594 struct iscsi_internal *priv;
1595 unsigned long flags;
1596 int count = 0, err;
1597
1598 BUG_ON(!tt);
1599
1600 priv = iscsi_if_transport_lookup(tt);
1601 if (priv)
1602 return NULL;
1603
1604 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1605 if (!priv)
1606 return NULL;
1607 INIT_LIST_HEAD(&priv->list);
1608 priv->daemon_pid = -1;
1609 priv->iscsi_transport = tt;
1610 priv->t.user_scan = iscsi_user_scan;
1611
1612 priv->dev.class = &iscsi_transport_class;
1613 snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name);
1614 err = device_register(&priv->dev);
1615 if (err)
1616 goto free_priv;
1617
1618 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1619 if (err)
1620 goto unregister_dev;
1621
1622 /* host parameters */
1623 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1624 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1625 priv->t.host_attrs.ac.match = iscsi_host_match;
1626 priv->t.host_size = sizeof(struct iscsi_host);
1627 transport_container_register(&priv->t.host_attrs);
1628
1629 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1630 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1631 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1632 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1633 BUG_ON(count > ISCSI_HOST_ATTRS);
1634 priv->host_attrs[count] = NULL;
1635 count = 0;
1636
1637 /* connection parameters */
1638 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1639 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1640 priv->conn_cont.ac.match = iscsi_conn_match;
1641 transport_container_register(&priv->conn_cont);
1642
1643 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1644 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1645 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1646 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1647 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1648 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1649 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1650 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1651 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1652 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1653 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1654 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1655 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1656
1657 BUG_ON(count > ISCSI_CONN_ATTRS);
1658 priv->conn_attrs[count] = NULL;
1659 count = 0;
1660
1661 /* session parameters */
1662 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1663 priv->session_cont.ac.class = &iscsi_session_class.class;
1664 priv->session_cont.ac.match = iscsi_session_match;
1665 transport_container_register(&priv->session_cont);
1666
1667 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1668 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1669 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1670 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1671 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1672 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1673 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1674 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1675 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1676 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1677 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1678 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1679 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1680 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1681 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1682 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1683 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1684 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1685 SETUP_PRIV_SESSION_RD_ATTR(state);
1686
1687 BUG_ON(count > ISCSI_SESSION_ATTRS);
1688 priv->session_attrs[count] = NULL;
1689
1690 spin_lock_irqsave(&iscsi_transport_lock, flags);
1691 list_add(&priv->list, &iscsi_transports);
1692 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1693
1694 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1695 return &priv->t;
1696
1697 unregister_dev:
1698 device_unregister(&priv->dev);
1699 free_priv:
1700 kfree(priv);
1701 return NULL;
1702 }
1703 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1704
1705 int iscsi_unregister_transport(struct iscsi_transport *tt)
1706 {
1707 struct iscsi_internal *priv;
1708 unsigned long flags;
1709
1710 BUG_ON(!tt);
1711
1712 mutex_lock(&rx_queue_mutex);
1713
1714 priv = iscsi_if_transport_lookup(tt);
1715 BUG_ON (!priv);
1716
1717 spin_lock_irqsave(&iscsi_transport_lock, flags);
1718 list_del(&priv->list);
1719 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1720
1721 transport_container_unregister(&priv->conn_cont);
1722 transport_container_unregister(&priv->session_cont);
1723 transport_container_unregister(&priv->t.host_attrs);
1724
1725 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1726 device_unregister(&priv->dev);
1727 mutex_unlock(&rx_queue_mutex);
1728
1729 return 0;
1730 }
1731 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1732
1733 static __init int iscsi_transport_init(void)
1734 {
1735 int err;
1736
1737 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1738 ISCSI_TRANSPORT_VERSION);
1739
1740 atomic_set(&iscsi_session_nr, 0);
1741
1742 err = class_register(&iscsi_transport_class);
1743 if (err)
1744 return err;
1745
1746 err = transport_class_register(&iscsi_host_class);
1747 if (err)
1748 goto unregister_transport_class;
1749
1750 err = transport_class_register(&iscsi_connection_class);
1751 if (err)
1752 goto unregister_host_class;
1753
1754 err = transport_class_register(&iscsi_session_class);
1755 if (err)
1756 goto unregister_conn_class;
1757
1758 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
1759 THIS_MODULE);
1760 if (!nls) {
1761 err = -ENOBUFS;
1762 goto unregister_session_class;
1763 }
1764
1765 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1766 if (!iscsi_eh_timer_workq)
1767 goto release_nls;
1768
1769 return 0;
1770
1771 release_nls:
1772 netlink_kernel_release(nls);
1773 unregister_session_class:
1774 transport_class_unregister(&iscsi_session_class);
1775 unregister_conn_class:
1776 transport_class_unregister(&iscsi_connection_class);
1777 unregister_host_class:
1778 transport_class_unregister(&iscsi_host_class);
1779 unregister_transport_class:
1780 class_unregister(&iscsi_transport_class);
1781 return err;
1782 }
1783
1784 static void __exit iscsi_transport_exit(void)
1785 {
1786 destroy_workqueue(iscsi_eh_timer_workq);
1787 netlink_kernel_release(nls);
1788 transport_class_unregister(&iscsi_connection_class);
1789 transport_class_unregister(&iscsi_session_class);
1790 transport_class_unregister(&iscsi_host_class);
1791 class_unregister(&iscsi_transport_class);
1792 }
1793
1794 module_init(iscsi_transport_init);
1795 module_exit(iscsi_transport_exit);
1796
1797 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1798 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1799 "Alex Aizman <itn780@yahoo.com>");
1800 MODULE_DESCRIPTION("iSCSI Transport Interface");
1801 MODULE_LICENSE("GPL");
1802 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
Linux kernel - Deliverables
This page took 0.071877 seconds and 5 git commands to generate.