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x86: fix nmi_watchdog=2 on Pentium-D CPUs
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / scsi / scsi_transport_iscsi.c
blobca7bb6f63bdeb6bcee801e8588b5d339c47a6f57
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 class_device cdev;
44
45 struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct class_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 cdev_to_iscsi_internal(_cdev) \
67 container_of(_cdev, struct iscsi_internal, cdev)
68
69 static void iscsi_transport_release(struct class_device *cdev)
70 {
71 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
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 .release = iscsi_transport_release,
82 };
83
84 static ssize_t
85 show_transport_handle(struct class_device *cdev, char *buf)
86 {
87 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
88 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
89 }
90 static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
91
92 #define show_transport_attr(name, format) \
93 static ssize_t \
94 show_transport_##name(struct class_device *cdev, char *buf) \
95 { \
96 struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
97 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
98 } \
99 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
100
101 show_transport_attr(caps, "0x%x");
102 show_transport_attr(max_lun, "%d");
103 show_transport_attr(max_conn, "%d");
104 show_transport_attr(max_cmd_len, "%d");
105
106 static struct attribute *iscsi_transport_attrs[] = {
107 &class_device_attr_handle.attr,
108 &class_device_attr_caps.attr,
109 &class_device_attr_max_lun.attr,
110 &class_device_attr_max_conn.attr,
111 &class_device_attr_max_cmd_len.attr,
112 NULL,
113 };
114
115 static struct attribute_group iscsi_transport_group = {
116 .attrs = iscsi_transport_attrs,
117 };
118
119
120
121 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
122 struct class_device *cdev)
123 {
124 struct Scsi_Host *shost = dev_to_shost(dev);
125 struct iscsi_host *ihost = shost->shost_data;
126
127 memset(ihost, 0, sizeof(*ihost));
128 INIT_LIST_HEAD(&ihost->sessions);
129 mutex_init(&ihost->mutex);
130 atomic_set(&ihost->nr_scans, 0);
131
132 snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
133 shost->host_no);
134 ihost->scan_workq = create_singlethread_workqueue(
135 ihost->scan_workq_name);
136 if (!ihost->scan_workq)
137 return -ENOMEM;
138 return 0;
139 }
140
141 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
142 struct class_device *cdev)
143 {
144 struct Scsi_Host *shost = dev_to_shost(dev);
145 struct iscsi_host *ihost = shost->shost_data;
146
147 destroy_workqueue(ihost->scan_workq);
148 return 0;
149 }
150
151 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
152 "iscsi_host",
153 iscsi_setup_host,
154 iscsi_remove_host,
155 NULL);
156
157 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
158 "iscsi_session",
159 NULL,
160 NULL,
161 NULL);
162
163 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
164 "iscsi_connection",
165 NULL,
166 NULL,
167 NULL);
168
169 static struct sock *nls;
170 static DEFINE_MUTEX(rx_queue_mutex);
171
172 static LIST_HEAD(sesslist);
173 static DEFINE_SPINLOCK(sesslock);
174 static LIST_HEAD(connlist);
175 static DEFINE_SPINLOCK(connlock);
176
177 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
178 {
179 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
180 return sess->sid;
181 }
182
183 /*
184 * Returns the matching session to a given sid
185 */
186 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
187 {
188 unsigned long flags;
189 struct iscsi_cls_session *sess;
190
191 spin_lock_irqsave(&sesslock, flags);
192 list_for_each_entry(sess, &sesslist, sess_list) {
193 if (sess->sid == sid) {
194 spin_unlock_irqrestore(&sesslock, flags);
195 return sess;
196 }
197 }
198 spin_unlock_irqrestore(&sesslock, flags);
199 return NULL;
200 }
201
202 /*
203 * Returns the matching connection to a given sid / cid tuple
204 */
205 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
206 {
207 unsigned long flags;
208 struct iscsi_cls_conn *conn;
209
210 spin_lock_irqsave(&connlock, flags);
211 list_for_each_entry(conn, &connlist, conn_list) {
212 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
213 spin_unlock_irqrestore(&connlock, flags);
214 return conn;
215 }
216 }
217 spin_unlock_irqrestore(&connlock, flags);
218 return NULL;
219 }
220
221 /*
222 * The following functions can be used by LLDs that allocate
223 * their own scsi_hosts or by software iscsi LLDs
224 */
225 static struct {
226 int value;
227 char *name;
228 } iscsi_session_state_names[] = {
229 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
230 { ISCSI_SESSION_FAILED, "FAILED" },
231 { ISCSI_SESSION_FREE, "FREE" },
232 };
233
234 static const char *iscsi_session_state_name(int state)
235 {
236 int i;
237 char *name = NULL;
238
239 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
240 if (iscsi_session_state_names[i].value == state) {
241 name = iscsi_session_state_names[i].name;
242 break;
243 }
244 }
245 return name;
246 }
247
248 int iscsi_session_chkready(struct iscsi_cls_session *session)
249 {
250 unsigned long flags;
251 int err;
252
253 spin_lock_irqsave(&session->lock, flags);
254 switch (session->state) {
255 case ISCSI_SESSION_LOGGED_IN:
256 err = 0;
257 break;
258 case ISCSI_SESSION_FAILED:
259 err = DID_IMM_RETRY << 16;
260 break;
261 case ISCSI_SESSION_FREE:
262 err = DID_NO_CONNECT << 16;
263 break;
264 default:
265 err = DID_NO_CONNECT << 16;
266 break;
267 }
268 spin_unlock_irqrestore(&session->lock, flags);
269 return err;
270 }
271 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
272
273 static void iscsi_session_release(struct device *dev)
274 {
275 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
276 struct Scsi_Host *shost;
277
278 shost = iscsi_session_to_shost(session);
279 scsi_host_put(shost);
280 kfree(session);
281 }
282
283 static int iscsi_is_session_dev(const struct device *dev)
284 {
285 return dev->release == iscsi_session_release;
286 }
287
288 /**
289 * iscsi_scan_finished - helper to report when running scans are done
290 * @shost: scsi host
291 * @time: scan run time
292 *
293 * This function can be used by drives like qla4xxx to report to the scsi
294 * layer when the scans it kicked off at module load time are done.
295 */
296 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
297 {
298 struct iscsi_host *ihost = shost->shost_data;
299 /*
300 * qla4xxx will have kicked off some session unblocks before calling
301 * scsi_scan_host, so just wait for them to complete.
302 */
303 return !atomic_read(&ihost->nr_scans);
304 }
305 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
306
307 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
308 uint id, uint lun)
309 {
310 struct iscsi_host *ihost = shost->shost_data;
311 struct iscsi_cls_session *session;
312
313 mutex_lock(&ihost->mutex);
314 list_for_each_entry(session, &ihost->sessions, host_list) {
315 if ((channel == SCAN_WILD_CARD || channel == 0) &&
316 (id == SCAN_WILD_CARD || id == session->target_id))
317 scsi_scan_target(&session->dev, 0,
318 session->target_id, lun, 1);
319 }
320 mutex_unlock(&ihost->mutex);
321
322 return 0;
323 }
324
325 static void iscsi_scan_session(struct work_struct *work)
326 {
327 struct iscsi_cls_session *session =
328 container_of(work, struct iscsi_cls_session, scan_work);
329 struct Scsi_Host *shost = iscsi_session_to_shost(session);
330 struct iscsi_host *ihost = shost->shost_data;
331 unsigned long flags;
332
333 spin_lock_irqsave(&session->lock, flags);
334 if (session->state != ISCSI_SESSION_LOGGED_IN) {
335 spin_unlock_irqrestore(&session->lock, flags);
336 goto done;
337 }
338 spin_unlock_irqrestore(&session->lock, flags);
339
340 scsi_scan_target(&session->dev, 0, session->target_id,
341 SCAN_WILD_CARD, 1);
342 done:
343 atomic_dec(&ihost->nr_scans);
344 }
345
346 static void session_recovery_timedout(struct work_struct *work)
347 {
348 struct iscsi_cls_session *session =
349 container_of(work, struct iscsi_cls_session,
350 recovery_work.work);
351 unsigned long flags;
352
353 iscsi_cls_session_printk(KERN_INFO, session,
354 "session recovery timed out after %d secs\n",
355 session->recovery_tmo);
356
357 spin_lock_irqsave(&session->lock, flags);
358 switch (session->state) {
359 case ISCSI_SESSION_FAILED:
360 session->state = ISCSI_SESSION_FREE;
361 break;
362 case ISCSI_SESSION_LOGGED_IN:
363 case ISCSI_SESSION_FREE:
364 /* we raced with the unblock's flush */
365 spin_unlock_irqrestore(&session->lock, flags);
366 return;
367 }
368 spin_unlock_irqrestore(&session->lock, flags);
369
370 if (session->transport->session_recovery_timedout)
371 session->transport->session_recovery_timedout(session);
372
373 scsi_target_unblock(&session->dev);
374 }
375
376 static void __iscsi_unblock_session(struct work_struct *work)
377 {
378 struct iscsi_cls_session *session =
379 container_of(work, struct iscsi_cls_session,
380 unblock_work);
381 struct Scsi_Host *shost = iscsi_session_to_shost(session);
382 struct iscsi_host *ihost = shost->shost_data;
383 unsigned long flags;
384
385 /*
386 * The recovery and unblock work get run from the same workqueue,
387 * so try to cancel it if it was going to run after this unblock.
388 */
389 cancel_delayed_work(&session->recovery_work);
390 spin_lock_irqsave(&session->lock, flags);
391 session->state = ISCSI_SESSION_LOGGED_IN;
392 spin_unlock_irqrestore(&session->lock, flags);
393 /* start IO */
394 scsi_target_unblock(&session->dev);
395 /*
396 * Only do kernel scanning if the driver is properly hooked into
397 * the async scanning code (drivers like iscsi_tcp do login and
398 * scanning from userspace).
399 */
400 if (shost->hostt->scan_finished) {
401 if (queue_work(ihost->scan_workq, &session->scan_work))
402 atomic_inc(&ihost->nr_scans);
403 }
404 }
405
406 /**
407 * iscsi_unblock_session - set a session as logged in and start IO.
408 * @session: iscsi session
409 *
410 * Mark a session as ready to accept IO.
411 */
412 void iscsi_unblock_session(struct iscsi_cls_session *session)
413 {
414 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
415 /*
416 * make sure all the events have completed before tell the driver
417 * it is safe
418 */
419 flush_workqueue(iscsi_eh_timer_workq);
420 }
421 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
422
423 static void __iscsi_block_session(struct work_struct *work)
424 {
425 struct iscsi_cls_session *session =
426 container_of(work, struct iscsi_cls_session,
427 block_work);
428 unsigned long flags;
429
430 spin_lock_irqsave(&session->lock, flags);
431 session->state = ISCSI_SESSION_FAILED;
432 spin_unlock_irqrestore(&session->lock, flags);
433 scsi_target_block(&session->dev);
434 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
435 session->recovery_tmo * HZ);
436 }
437
438 void iscsi_block_session(struct iscsi_cls_session *session)
439 {
440 queue_work(iscsi_eh_timer_workq, &session->block_work);
441 }
442 EXPORT_SYMBOL_GPL(iscsi_block_session);
443
444 static void __iscsi_unbind_session(struct work_struct *work)
445 {
446 struct iscsi_cls_session *session =
447 container_of(work, struct iscsi_cls_session,
448 unbind_work);
449 struct Scsi_Host *shost = iscsi_session_to_shost(session);
450 struct iscsi_host *ihost = shost->shost_data;
451
452 /* Prevent new scans and make sure scanning is not in progress */
453 mutex_lock(&ihost->mutex);
454 if (list_empty(&session->host_list)) {
455 mutex_unlock(&ihost->mutex);
456 return;
457 }
458 list_del_init(&session->host_list);
459 mutex_unlock(&ihost->mutex);
460
461 scsi_remove_target(&session->dev);
462 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
463 }
464
465 static int iscsi_unbind_session(struct iscsi_cls_session *session)
466 {
467 struct Scsi_Host *shost = iscsi_session_to_shost(session);
468 struct iscsi_host *ihost = shost->shost_data;
469
470 return queue_work(ihost->scan_workq, &session->unbind_work);
471 }
472
473 struct iscsi_cls_session *
474 iscsi_alloc_session(struct Scsi_Host *shost,
475 struct iscsi_transport *transport)
476 {
477 struct iscsi_cls_session *session;
478
479 session = kzalloc(sizeof(*session) + transport->sessiondata_size,
480 GFP_KERNEL);
481 if (!session)
482 return NULL;
483
484 session->transport = transport;
485 session->recovery_tmo = 120;
486 session->state = ISCSI_SESSION_FREE;
487 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
488 INIT_LIST_HEAD(&session->host_list);
489 INIT_LIST_HEAD(&session->sess_list);
490 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
491 INIT_WORK(&session->block_work, __iscsi_block_session);
492 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
493 INIT_WORK(&session->scan_work, iscsi_scan_session);
494 spin_lock_init(&session->lock);
495
496 /* this is released in the dev's release function */
497 scsi_host_get(shost);
498 session->dev.parent = &shost->shost_gendev;
499 session->dev.release = iscsi_session_release;
500 device_initialize(&session->dev);
501 if (transport->sessiondata_size)
502 session->dd_data = &session[1];
503 return session;
504 }
505 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
506
507 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
508 {
509 struct Scsi_Host *shost = iscsi_session_to_shost(session);
510 struct iscsi_host *ihost;
511 unsigned long flags;
512 int err;
513
514 ihost = shost->shost_data;
515 session->sid = atomic_add_return(1, &iscsi_session_nr);
516 session->target_id = target_id;
517
518 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
519 session->sid);
520 err = device_add(&session->dev);
521 if (err) {
522 iscsi_cls_session_printk(KERN_ERR, session,
523 "could not register session's dev\n");
524 goto release_host;
525 }
526 transport_register_device(&session->dev);
527
528 spin_lock_irqsave(&sesslock, flags);
529 list_add(&session->sess_list, &sesslist);
530 spin_unlock_irqrestore(&sesslock, flags);
531
532 mutex_lock(&ihost->mutex);
533 list_add(&session->host_list, &ihost->sessions);
534 mutex_unlock(&ihost->mutex);
535
536 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
537 return 0;
538
539 release_host:
540 scsi_host_put(shost);
541 return err;
542 }
543 EXPORT_SYMBOL_GPL(iscsi_add_session);
544
545 /**
546 * iscsi_create_session - create iscsi class session
547 * @shost: scsi host
548 * @transport: iscsi transport
549 * @target_id: which target
550 *
551 * This can be called from a LLD or iscsi_transport.
552 */
553 struct iscsi_cls_session *
554 iscsi_create_session(struct Scsi_Host *shost,
555 struct iscsi_transport *transport,
556 unsigned int target_id)
557 {
558 struct iscsi_cls_session *session;
559
560 session = iscsi_alloc_session(shost, transport);
561 if (!session)
562 return NULL;
563
564 if (iscsi_add_session(session, target_id)) {
565 iscsi_free_session(session);
566 return NULL;
567 }
568 return session;
569 }
570 EXPORT_SYMBOL_GPL(iscsi_create_session);
571
572 static void iscsi_conn_release(struct device *dev)
573 {
574 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
575 struct device *parent = conn->dev.parent;
576
577 kfree(conn);
578 put_device(parent);
579 }
580
581 static int iscsi_is_conn_dev(const struct device *dev)
582 {
583 return dev->release == iscsi_conn_release;
584 }
585
586 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
587 {
588 if (!iscsi_is_conn_dev(dev))
589 return 0;
590 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
591 }
592
593 void iscsi_remove_session(struct iscsi_cls_session *session)
594 {
595 struct Scsi_Host *shost = iscsi_session_to_shost(session);
596 struct iscsi_host *ihost = shost->shost_data;
597 unsigned long flags;
598 int err;
599
600 spin_lock_irqsave(&sesslock, flags);
601 list_del(&session->sess_list);
602 spin_unlock_irqrestore(&sesslock, flags);
603
604 /* make sure there are no blocks/unblocks queued */
605 flush_workqueue(iscsi_eh_timer_workq);
606 /* make sure the timedout callout is not running */
607 if (!cancel_delayed_work(&session->recovery_work))
608 flush_workqueue(iscsi_eh_timer_workq);
609 /*
610 * If we are blocked let commands flow again. The lld or iscsi
611 * layer should set up the queuecommand to fail commands.
612 * We assume that LLD will not be calling block/unblock while
613 * removing the session.
614 */
615 spin_lock_irqsave(&session->lock, flags);
616 session->state = ISCSI_SESSION_FREE;
617 spin_unlock_irqrestore(&session->lock, flags);
618
619 scsi_target_unblock(&session->dev);
620 /* flush running scans then delete devices */
621 flush_workqueue(ihost->scan_workq);
622 __iscsi_unbind_session(&session->unbind_work);
623
624 /* hw iscsi may not have removed all connections from session */
625 err = device_for_each_child(&session->dev, NULL,
626 iscsi_iter_destroy_conn_fn);
627 if (err)
628 iscsi_cls_session_printk(KERN_ERR, session,
629 "Could not delete all connections "
630 "for session. Error %d.\n", err);
631
632 transport_unregister_device(&session->dev);
633 device_del(&session->dev);
634 }
635 EXPORT_SYMBOL_GPL(iscsi_remove_session);
636
637 void iscsi_free_session(struct iscsi_cls_session *session)
638 {
639 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
640 put_device(&session->dev);
641 }
642 EXPORT_SYMBOL_GPL(iscsi_free_session);
643
644 /**
645 * iscsi_destroy_session - destroy iscsi session
646 * @session: iscsi_session
647 *
648 * Can be called by a LLD or iscsi_transport. There must not be
649 * any running connections.
650 */
651 int iscsi_destroy_session(struct iscsi_cls_session *session)
652 {
653 iscsi_remove_session(session);
654 iscsi_free_session(session);
655 return 0;
656 }
657 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
658
659 /**
660 * iscsi_create_conn - create iscsi class connection
661 * @session: iscsi cls session
662 * @cid: connection id
663 *
664 * This can be called from a LLD or iscsi_transport. The connection
665 * is child of the session so cid must be unique for all connections
666 * on the session.
667 *
668 * Since we do not support MCS, cid will normally be zero. In some cases
669 * for software iscsi we could be trying to preallocate a connection struct
670 * in which case there could be two connection structs and cid would be
671 * non-zero.
672 */
673 struct iscsi_cls_conn *
674 iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
675 {
676 struct iscsi_transport *transport = session->transport;
677 struct iscsi_cls_conn *conn;
678 unsigned long flags;
679 int err;
680
681 conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
682 if (!conn)
683 return NULL;
684
685 if (transport->conndata_size)
686 conn->dd_data = &conn[1];
687
688 INIT_LIST_HEAD(&conn->conn_list);
689 conn->transport = transport;
690 conn->cid = cid;
691
692 /* this is released in the dev's release function */
693 if (!get_device(&session->dev))
694 goto free_conn;
695
696 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
697 session->sid, cid);
698 conn->dev.parent = &session->dev;
699 conn->dev.release = iscsi_conn_release;
700 err = device_register(&conn->dev);
701 if (err) {
702 iscsi_cls_session_printk(KERN_ERR, session, "could not "
703 "register connection's dev\n");
704 goto release_parent_ref;
705 }
706 transport_register_device(&conn->dev);
707
708 spin_lock_irqsave(&connlock, flags);
709 list_add(&conn->conn_list, &connlist);
710 conn->active = 1;
711 spin_unlock_irqrestore(&connlock, flags);
712 return conn;
713
714 release_parent_ref:
715 put_device(&session->dev);
716 free_conn:
717 kfree(conn);
718 return NULL;
719 }
720
721 EXPORT_SYMBOL_GPL(iscsi_create_conn);
722
723 /**
724 * iscsi_destroy_conn - destroy iscsi class connection
725 * @conn: iscsi cls session
726 *
727 * This can be called from a LLD or iscsi_transport.
728 */
729 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
730 {
731 unsigned long flags;
732
733 spin_lock_irqsave(&connlock, flags);
734 conn->active = 0;
735 list_del(&conn->conn_list);
736 spin_unlock_irqrestore(&connlock, flags);
737
738 transport_unregister_device(&conn->dev);
739 device_unregister(&conn->dev);
740 return 0;
741 }
742 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
743
744 /*
745 * iscsi interface functions
746 */
747 static struct iscsi_internal *
748 iscsi_if_transport_lookup(struct iscsi_transport *tt)
749 {
750 struct iscsi_internal *priv;
751 unsigned long flags;
752
753 spin_lock_irqsave(&iscsi_transport_lock, flags);
754 list_for_each_entry(priv, &iscsi_transports, list) {
755 if (tt == priv->iscsi_transport) {
756 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
757 return priv;
758 }
759 }
760 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
761 return NULL;
762 }
763
764 static int
765 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
766 {
767 int rc;
768
769 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
770 if (rc < 0) {
771 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
772 return rc;
773 }
774
775 return 0;
776 }
777
778 static int
779 iscsi_unicast_skb(struct sk_buff *skb, int pid)
780 {
781 int rc;
782
783 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
784 if (rc < 0) {
785 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
786 return rc;
787 }
788
789 return 0;
790 }
791
792 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
793 char *data, uint32_t data_size)
794 {
795 struct nlmsghdr *nlh;
796 struct sk_buff *skb;
797 struct iscsi_uevent *ev;
798 char *pdu;
799 struct iscsi_internal *priv;
800 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
801 data_size);
802
803 priv = iscsi_if_transport_lookup(conn->transport);
804 if (!priv)
805 return -EINVAL;
806
807 skb = alloc_skb(len, GFP_ATOMIC);
808 if (!skb) {
809 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
810 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
811 "control PDU: OOM\n");
812 return -ENOMEM;
813 }
814
815 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
816 ev = NLMSG_DATA(nlh);
817 memset(ev, 0, sizeof(*ev));
818 ev->transport_handle = iscsi_handle(conn->transport);
819 ev->type = ISCSI_KEVENT_RECV_PDU;
820 ev->r.recv_req.cid = conn->cid;
821 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
822 pdu = (char*)ev + sizeof(*ev);
823 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
824 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
825
826 return iscsi_unicast_skb(skb, priv->daemon_pid);
827 }
828 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
829
830 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
831 {
832 struct nlmsghdr *nlh;
833 struct sk_buff *skb;
834 struct iscsi_uevent *ev;
835 struct iscsi_internal *priv;
836 int len = NLMSG_SPACE(sizeof(*ev));
837
838 priv = iscsi_if_transport_lookup(conn->transport);
839 if (!priv)
840 return;
841
842 skb = alloc_skb(len, GFP_ATOMIC);
843 if (!skb) {
844 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
845 "conn error (%d)\n", error);
846 return;
847 }
848
849 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
850 ev = NLMSG_DATA(nlh);
851 ev->transport_handle = iscsi_handle(conn->transport);
852 ev->type = ISCSI_KEVENT_CONN_ERROR;
853 ev->r.connerror.error = error;
854 ev->r.connerror.cid = conn->cid;
855 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
856
857 iscsi_broadcast_skb(skb, GFP_ATOMIC);
858
859 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
860 error);
861 }
862 EXPORT_SYMBOL_GPL(iscsi_conn_error);
863
864 static int
865 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
866 void *payload, int size)
867 {
868 struct sk_buff *skb;
869 struct nlmsghdr *nlh;
870 int len = NLMSG_SPACE(size);
871 int flags = multi ? NLM_F_MULTI : 0;
872 int t = done ? NLMSG_DONE : type;
873
874 skb = alloc_skb(len, GFP_ATOMIC);
875 if (!skb) {
876 printk(KERN_ERR "Could not allocate skb to send reply.\n");
877 return -ENOMEM;
878 }
879
880 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
881 nlh->nlmsg_flags = flags;
882 memcpy(NLMSG_DATA(nlh), payload, size);
883 return iscsi_unicast_skb(skb, pid);
884 }
885
886 static int
887 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
888 {
889 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
890 struct iscsi_stats *stats;
891 struct sk_buff *skbstat;
892 struct iscsi_cls_conn *conn;
893 struct nlmsghdr *nlhstat;
894 struct iscsi_uevent *evstat;
895 struct iscsi_internal *priv;
896 int len = NLMSG_SPACE(sizeof(*ev) +
897 sizeof(struct iscsi_stats) +
898 sizeof(struct iscsi_stats_custom) *
899 ISCSI_STATS_CUSTOM_MAX);
900 int err = 0;
901
902 priv = iscsi_if_transport_lookup(transport);
903 if (!priv)
904 return -EINVAL;
905
906 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
907 if (!conn)
908 return -EEXIST;
909
910 do {
911 int actual_size;
912
913 skbstat = alloc_skb(len, GFP_ATOMIC);
914 if (!skbstat) {
915 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
916 "deliver stats: OOM\n");
917 return -ENOMEM;
918 }
919
920 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
921 (len - sizeof(*nlhstat)), 0);
922 evstat = NLMSG_DATA(nlhstat);
923 memset(evstat, 0, sizeof(*evstat));
924 evstat->transport_handle = iscsi_handle(conn->transport);
925 evstat->type = nlh->nlmsg_type;
926 evstat->u.get_stats.cid =
927 ev->u.get_stats.cid;
928 evstat->u.get_stats.sid =
929 ev->u.get_stats.sid;
930 stats = (struct iscsi_stats *)
931 ((char*)evstat + sizeof(*evstat));
932 memset(stats, 0, sizeof(*stats));
933
934 transport->get_stats(conn, stats);
935 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
936 sizeof(struct iscsi_stats) +
937 sizeof(struct iscsi_stats_custom) *
938 stats->custom_length);
939 actual_size -= sizeof(*nlhstat);
940 actual_size = NLMSG_LENGTH(actual_size);
941 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
942 nlhstat->nlmsg_len = actual_size;
943
944 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
945 } while (err < 0 && err != -ECONNREFUSED);
946
947 return err;
948 }
949
950 /**
951 * iscsi_session_event - send session destr. completion event
952 * @session: iscsi class session
953 * @event: type of event
954 */
955 int iscsi_session_event(struct iscsi_cls_session *session,
956 enum iscsi_uevent_e event)
957 {
958 struct iscsi_internal *priv;
959 struct Scsi_Host *shost;
960 struct iscsi_uevent *ev;
961 struct sk_buff *skb;
962 struct nlmsghdr *nlh;
963 int rc, len = NLMSG_SPACE(sizeof(*ev));
964
965 priv = iscsi_if_transport_lookup(session->transport);
966 if (!priv)
967 return -EINVAL;
968 shost = iscsi_session_to_shost(session);
969
970 skb = alloc_skb(len, GFP_KERNEL);
971 if (!skb) {
972 iscsi_cls_session_printk(KERN_ERR, session,
973 "Cannot notify userspace of session "
974 "event %u\n", event);
975 return -ENOMEM;
976 }
977
978 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
979 ev = NLMSG_DATA(nlh);
980 ev->transport_handle = iscsi_handle(session->transport);
981
982 ev->type = event;
983 switch (event) {
984 case ISCSI_KEVENT_DESTROY_SESSION:
985 ev->r.d_session.host_no = shost->host_no;
986 ev->r.d_session.sid = session->sid;
987 break;
988 case ISCSI_KEVENT_CREATE_SESSION:
989 ev->r.c_session_ret.host_no = shost->host_no;
990 ev->r.c_session_ret.sid = session->sid;
991 break;
992 case ISCSI_KEVENT_UNBIND_SESSION:
993 ev->r.unbind_session.host_no = shost->host_no;
994 ev->r.unbind_session.sid = session->sid;
995 break;
996 default:
997 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
998 "%u.\n", event);
999 kfree_skb(skb);
1000 return -EINVAL;
1001 }
1002
1003 /*
1004 * this will occur if the daemon is not up, so we just warn
1005 * the user and when the daemon is restarted it will handle it
1006 */
1007 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1008 if (rc < 0)
1009 iscsi_cls_session_printk(KERN_ERR, session,
1010 "Cannot notify userspace of session "
1011 "event %u. Check iscsi daemon\n",
1012 event);
1013 return rc;
1014 }
1015 EXPORT_SYMBOL_GPL(iscsi_session_event);
1016
1017 static int
1018 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
1019 {
1020 struct iscsi_transport *transport = priv->iscsi_transport;
1021 struct iscsi_cls_session *session;
1022 uint32_t hostno;
1023
1024 session = transport->create_session(transport, &priv->t,
1025 ev->u.c_session.cmds_max,
1026 ev->u.c_session.queue_depth,
1027 ev->u.c_session.initial_cmdsn,
1028 &hostno);
1029 if (!session)
1030 return -ENOMEM;
1031
1032 ev->r.c_session_ret.host_no = hostno;
1033 ev->r.c_session_ret.sid = session->sid;
1034 return 0;
1035 }
1036
1037 static int
1038 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1039 {
1040 struct iscsi_cls_conn *conn;
1041 struct iscsi_cls_session *session;
1042
1043 session = iscsi_session_lookup(ev->u.c_conn.sid);
1044 if (!session) {
1045 printk(KERN_ERR "iscsi: invalid session %d.\n",
1046 ev->u.c_conn.sid);
1047 return -EINVAL;
1048 }
1049
1050 conn = transport->create_conn(session, ev->u.c_conn.cid);
1051 if (!conn) {
1052 iscsi_cls_session_printk(KERN_ERR, session,
1053 "couldn't create a new connection.");
1054 return -ENOMEM;
1055 }
1056
1057 ev->r.c_conn_ret.sid = session->sid;
1058 ev->r.c_conn_ret.cid = conn->cid;
1059 return 0;
1060 }
1061
1062 static int
1063 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1064 {
1065 struct iscsi_cls_conn *conn;
1066
1067 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1068 if (!conn)
1069 return -EINVAL;
1070
1071 if (transport->destroy_conn)
1072 transport->destroy_conn(conn);
1073 return 0;
1074 }
1075
1076 static int
1077 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1078 {
1079 char *data = (char*)ev + sizeof(*ev);
1080 struct iscsi_cls_conn *conn;
1081 struct iscsi_cls_session *session;
1082 int err = 0, value = 0;
1083
1084 session = iscsi_session_lookup(ev->u.set_param.sid);
1085 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1086 if (!conn || !session)
1087 return -EINVAL;
1088
1089 switch (ev->u.set_param.param) {
1090 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1091 sscanf(data, "%d", &value);
1092 if (value != 0)
1093 session->recovery_tmo = value;
1094 break;
1095 default:
1096 err = transport->set_param(conn, ev->u.set_param.param,
1097 data, ev->u.set_param.len);
1098 }
1099
1100 return err;
1101 }
1102
1103 static int
1104 iscsi_if_transport_ep(struct iscsi_transport *transport,
1105 struct iscsi_uevent *ev, int msg_type)
1106 {
1107 struct sockaddr *dst_addr;
1108 int rc = 0;
1109
1110 switch (msg_type) {
1111 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1112 if (!transport->ep_connect)
1113 return -EINVAL;
1114
1115 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1116 rc = transport->ep_connect(dst_addr,
1117 ev->u.ep_connect.non_blocking,
1118 &ev->r.ep_connect_ret.handle);
1119 break;
1120 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1121 if (!transport->ep_poll)
1122 return -EINVAL;
1123
1124 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
1125 ev->u.ep_poll.timeout_ms);
1126 break;
1127 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1128 if (!transport->ep_disconnect)
1129 return -EINVAL;
1130
1131 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
1132 break;
1133 }
1134 return rc;
1135 }
1136
1137 static int
1138 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1139 struct iscsi_uevent *ev)
1140 {
1141 struct Scsi_Host *shost;
1142 struct sockaddr *dst_addr;
1143 int err;
1144
1145 if (!transport->tgt_dscvr)
1146 return -EINVAL;
1147
1148 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1149 if (IS_ERR(shost)) {
1150 printk(KERN_ERR "target discovery could not find host no %u\n",
1151 ev->u.tgt_dscvr.host_no);
1152 return -ENODEV;
1153 }
1154
1155
1156 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1157 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1158 ev->u.tgt_dscvr.enable, dst_addr);
1159 scsi_host_put(shost);
1160 return err;
1161 }
1162
1163 static int
1164 iscsi_set_host_param(struct iscsi_transport *transport,
1165 struct iscsi_uevent *ev)
1166 {
1167 char *data = (char*)ev + sizeof(*ev);
1168 struct Scsi_Host *shost;
1169 int err;
1170
1171 if (!transport->set_host_param)
1172 return -ENOSYS;
1173
1174 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1175 if (IS_ERR(shost)) {
1176 printk(KERN_ERR "set_host_param could not find host no %u\n",
1177 ev->u.set_host_param.host_no);
1178 return -ENODEV;
1179 }
1180
1181 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1182 data, ev->u.set_host_param.len);
1183 scsi_host_put(shost);
1184 return err;
1185 }
1186
1187 static int
1188 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1189 {
1190 int err = 0;
1191 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1192 struct iscsi_transport *transport = NULL;
1193 struct iscsi_internal *priv;
1194 struct iscsi_cls_session *session;
1195 struct iscsi_cls_conn *conn;
1196
1197 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1198 if (!priv)
1199 return -EINVAL;
1200 transport = priv->iscsi_transport;
1201
1202 if (!try_module_get(transport->owner))
1203 return -EINVAL;
1204
1205 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1206
1207 switch (nlh->nlmsg_type) {
1208 case ISCSI_UEVENT_CREATE_SESSION:
1209 err = iscsi_if_create_session(priv, ev);
1210 break;
1211 case ISCSI_UEVENT_DESTROY_SESSION:
1212 session = iscsi_session_lookup(ev->u.d_session.sid);
1213 if (session)
1214 transport->destroy_session(session);
1215 else
1216 err = -EINVAL;
1217 break;
1218 case ISCSI_UEVENT_UNBIND_SESSION:
1219 session = iscsi_session_lookup(ev->u.d_session.sid);
1220 if (session)
1221 iscsi_unbind_session(session);
1222 else
1223 err = -EINVAL;
1224 break;
1225 case ISCSI_UEVENT_CREATE_CONN:
1226 err = iscsi_if_create_conn(transport, ev);
1227 break;
1228 case ISCSI_UEVENT_DESTROY_CONN:
1229 err = iscsi_if_destroy_conn(transport, ev);
1230 break;
1231 case ISCSI_UEVENT_BIND_CONN:
1232 session = iscsi_session_lookup(ev->u.b_conn.sid);
1233 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1234
1235 if (session && conn)
1236 ev->r.retcode = transport->bind_conn(session, conn,
1237 ev->u.b_conn.transport_eph,
1238 ev->u.b_conn.is_leading);
1239 else
1240 err = -EINVAL;
1241 break;
1242 case ISCSI_UEVENT_SET_PARAM:
1243 err = iscsi_set_param(transport, ev);
1244 break;
1245 case ISCSI_UEVENT_START_CONN:
1246 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1247 if (conn)
1248 ev->r.retcode = transport->start_conn(conn);
1249 else
1250 err = -EINVAL;
1251 break;
1252 case ISCSI_UEVENT_STOP_CONN:
1253 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1254 if (conn)
1255 transport->stop_conn(conn, ev->u.stop_conn.flag);
1256 else
1257 err = -EINVAL;
1258 break;
1259 case ISCSI_UEVENT_SEND_PDU:
1260 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1261 if (conn)
1262 ev->r.retcode = transport->send_pdu(conn,
1263 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1264 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1265 ev->u.send_pdu.data_size);
1266 else
1267 err = -EINVAL;
1268 break;
1269 case ISCSI_UEVENT_GET_STATS:
1270 err = iscsi_if_get_stats(transport, nlh);
1271 break;
1272 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1273 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1274 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1275 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1276 break;
1277 case ISCSI_UEVENT_TGT_DSCVR:
1278 err = iscsi_tgt_dscvr(transport, ev);
1279 break;
1280 case ISCSI_UEVENT_SET_HOST_PARAM:
1281 err = iscsi_set_host_param(transport, ev);
1282 break;
1283 default:
1284 err = -ENOSYS;
1285 break;
1286 }
1287
1288 module_put(transport->owner);
1289 return err;
1290 }
1291
1292 /*
1293 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1294 * Malformed skbs with wrong lengths or invalid creds are not processed.
1295 */
1296 static void
1297 iscsi_if_rx(struct sk_buff *skb)
1298 {
1299 mutex_lock(&rx_queue_mutex);
1300 while (skb->len >= NLMSG_SPACE(0)) {
1301 int err;
1302 uint32_t rlen;
1303 struct nlmsghdr *nlh;
1304 struct iscsi_uevent *ev;
1305
1306 nlh = nlmsg_hdr(skb);
1307 if (nlh->nlmsg_len < sizeof(*nlh) ||
1308 skb->len < nlh->nlmsg_len) {
1309 break;
1310 }
1311
1312 ev = NLMSG_DATA(nlh);
1313 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1314 if (rlen > skb->len)
1315 rlen = skb->len;
1316
1317 err = iscsi_if_recv_msg(skb, nlh);
1318 if (err) {
1319 ev->type = ISCSI_KEVENT_IF_ERROR;
1320 ev->iferror = err;
1321 }
1322 do {
1323 /*
1324 * special case for GET_STATS:
1325 * on success - sending reply and stats from
1326 * inside of if_recv_msg(),
1327 * on error - fall through.
1328 */
1329 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1330 break;
1331 err = iscsi_if_send_reply(
1332 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1333 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1334 } while (err < 0 && err != -ECONNREFUSED);
1335 skb_pull(skb, rlen);
1336 }
1337 mutex_unlock(&rx_queue_mutex);
1338 }
1339
1340 #define iscsi_cdev_to_conn(_cdev) \
1341 iscsi_dev_to_conn(_cdev->dev)
1342
1343 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1344 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
1345 __ATTR(_name,_mode,_show,_store)
1346
1347 /*
1348 * iSCSI connection attrs
1349 */
1350 #define iscsi_conn_attr_show(param) \
1351 static ssize_t \
1352 show_conn_param_##param(struct class_device *cdev, char *buf) \
1353 { \
1354 struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
1355 struct iscsi_transport *t = conn->transport; \
1356 return t->get_conn_param(conn, param, buf); \
1357 }
1358
1359 #define iscsi_conn_attr(field, param) \
1360 iscsi_conn_attr_show(param) \
1361 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1362 NULL);
1363
1364 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1365 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1366 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1367 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1368 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1369 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1370 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1371 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1372 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1373 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1374 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1375 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1376 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1377
1378 #define iscsi_cdev_to_session(_cdev) \
1379 iscsi_dev_to_session(_cdev->dev)
1380
1381 /*
1382 * iSCSI session attrs
1383 */
1384 #define iscsi_session_attr_show(param, perm) \
1385 static ssize_t \
1386 show_session_param_##param(struct class_device *cdev, char *buf) \
1387 { \
1388 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1389 struct iscsi_transport *t = session->transport; \
1390 \
1391 if (perm && !capable(CAP_SYS_ADMIN)) \
1392 return -EACCES; \
1393 return t->get_session_param(session, param, buf); \
1394 }
1395
1396 #define iscsi_session_attr(field, param, perm) \
1397 iscsi_session_attr_show(param, perm) \
1398 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1399 NULL);
1400
1401 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1402 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1403 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1404 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1405 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1406 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1407 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1408 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1409 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1410 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1411 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1412 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1413 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1414 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1415 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1416 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1417 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1418
1419 static ssize_t
1420 show_priv_session_state(struct class_device *cdev, char *buf)
1421 {
1422 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);
1423 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1424 }
1425 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1426 NULL);
1427
1428 #define iscsi_priv_session_attr_show(field, format) \
1429 static ssize_t \
1430 show_priv_session_##field(struct class_device *cdev, char *buf) \
1431 { \
1432 struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\
1433 return sprintf(buf, format"\n", session->field); \
1434 }
1435
1436 #define iscsi_priv_session_attr(field, format) \
1437 iscsi_priv_session_attr_show(field, format) \
1438 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1439 NULL)
1440 iscsi_priv_session_attr(recovery_tmo, "%d");
1441
1442 /*
1443 * iSCSI host attrs
1444 */
1445 #define iscsi_host_attr_show(param) \
1446 static ssize_t \
1447 show_host_param_##param(struct class_device *cdev, char *buf) \
1448 { \
1449 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
1450 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1451 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1452 }
1453
1454 #define iscsi_host_attr(field, param) \
1455 iscsi_host_attr_show(param) \
1456 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1457 NULL);
1458
1459 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1460 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1461 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1462 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1463
1464 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1465 do { \
1466 priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1467 count++; \
1468 } while (0)
1469
1470
1471 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1472 do { \
1473 if (tt->param_mask & param_flag) { \
1474 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1475 count++; \
1476 } \
1477 } while (0)
1478
1479 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1480 do { \
1481 if (tt->param_mask & param_flag) { \
1482 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1483 count++; \
1484 } \
1485 } while (0)
1486
1487 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1488 do { \
1489 if (tt->host_param_mask & param_flag) { \
1490 priv->host_attrs[count] = &class_device_attr_host_##field; \
1491 count++; \
1492 } \
1493 } while (0)
1494
1495 static int iscsi_session_match(struct attribute_container *cont,
1496 struct device *dev)
1497 {
1498 struct iscsi_cls_session *session;
1499 struct Scsi_Host *shost;
1500 struct iscsi_internal *priv;
1501
1502 if (!iscsi_is_session_dev(dev))
1503 return 0;
1504
1505 session = iscsi_dev_to_session(dev);
1506 shost = iscsi_session_to_shost(session);
1507 if (!shost->transportt)
1508 return 0;
1509
1510 priv = to_iscsi_internal(shost->transportt);
1511 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1512 return 0;
1513
1514 return &priv->session_cont.ac == cont;
1515 }
1516
1517 static int iscsi_conn_match(struct attribute_container *cont,
1518 struct device *dev)
1519 {
1520 struct iscsi_cls_session *session;
1521 struct iscsi_cls_conn *conn;
1522 struct Scsi_Host *shost;
1523 struct iscsi_internal *priv;
1524
1525 if (!iscsi_is_conn_dev(dev))
1526 return 0;
1527
1528 conn = iscsi_dev_to_conn(dev);
1529 session = iscsi_dev_to_session(conn->dev.parent);
1530 shost = iscsi_session_to_shost(session);
1531
1532 if (!shost->transportt)
1533 return 0;
1534
1535 priv = to_iscsi_internal(shost->transportt);
1536 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1537 return 0;
1538
1539 return &priv->conn_cont.ac == cont;
1540 }
1541
1542 static int iscsi_host_match(struct attribute_container *cont,
1543 struct device *dev)
1544 {
1545 struct Scsi_Host *shost;
1546 struct iscsi_internal *priv;
1547
1548 if (!scsi_is_host_device(dev))
1549 return 0;
1550
1551 shost = dev_to_shost(dev);
1552 if (!shost->transportt ||
1553 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1554 return 0;
1555
1556 priv = to_iscsi_internal(shost->transportt);
1557 return &priv->t.host_attrs.ac == cont;
1558 }
1559
1560 struct scsi_transport_template *
1561 iscsi_register_transport(struct iscsi_transport *tt)
1562 {
1563 struct iscsi_internal *priv;
1564 unsigned long flags;
1565 int count = 0, err;
1566
1567 BUG_ON(!tt);
1568
1569 priv = iscsi_if_transport_lookup(tt);
1570 if (priv)
1571 return NULL;
1572
1573 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1574 if (!priv)
1575 return NULL;
1576 INIT_LIST_HEAD(&priv->list);
1577 priv->daemon_pid = -1;
1578 priv->iscsi_transport = tt;
1579 priv->t.user_scan = iscsi_user_scan;
1580
1581 priv->cdev.class = &iscsi_transport_class;
1582 snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
1583 err = class_device_register(&priv->cdev);
1584 if (err)
1585 goto free_priv;
1586
1587 err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
1588 if (err)
1589 goto unregister_cdev;
1590
1591 /* host parameters */
1592 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1593 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1594 priv->t.host_attrs.ac.match = iscsi_host_match;
1595 priv->t.host_size = sizeof(struct iscsi_host);
1596 transport_container_register(&priv->t.host_attrs);
1597
1598 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1599 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1600 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1601 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1602 BUG_ON(count > ISCSI_HOST_ATTRS);
1603 priv->host_attrs[count] = NULL;
1604 count = 0;
1605
1606 /* connection parameters */
1607 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1608 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1609 priv->conn_cont.ac.match = iscsi_conn_match;
1610 transport_container_register(&priv->conn_cont);
1611
1612 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1613 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1614 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1615 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1616 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1617 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1618 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1619 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1620 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1621 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1622 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1623 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1624 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1625
1626 BUG_ON(count > ISCSI_CONN_ATTRS);
1627 priv->conn_attrs[count] = NULL;
1628 count = 0;
1629
1630 /* session parameters */
1631 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1632 priv->session_cont.ac.class = &iscsi_session_class.class;
1633 priv->session_cont.ac.match = iscsi_session_match;
1634 transport_container_register(&priv->session_cont);
1635
1636 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1637 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1638 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1639 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1640 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1641 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1642 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1643 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1644 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1645 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1646 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1647 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1648 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1649 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1650 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1651 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1652 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1653 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1654 SETUP_PRIV_SESSION_RD_ATTR(state);
1655
1656 BUG_ON(count > ISCSI_SESSION_ATTRS);
1657 priv->session_attrs[count] = NULL;
1658
1659 spin_lock_irqsave(&iscsi_transport_lock, flags);
1660 list_add(&priv->list, &iscsi_transports);
1661 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1662
1663 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1664 return &priv->t;
1665
1666 unregister_cdev:
1667 class_device_unregister(&priv->cdev);
1668 free_priv:
1669 kfree(priv);
1670 return NULL;
1671 }
1672 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1673
1674 int iscsi_unregister_transport(struct iscsi_transport *tt)
1675 {
1676 struct iscsi_internal *priv;
1677 unsigned long flags;
1678
1679 BUG_ON(!tt);
1680
1681 mutex_lock(&rx_queue_mutex);
1682
1683 priv = iscsi_if_transport_lookup(tt);
1684 BUG_ON (!priv);
1685
1686 spin_lock_irqsave(&iscsi_transport_lock, flags);
1687 list_del(&priv->list);
1688 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1689
1690 transport_container_unregister(&priv->conn_cont);
1691 transport_container_unregister(&priv->session_cont);
1692 transport_container_unregister(&priv->t.host_attrs);
1693
1694 sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
1695 class_device_unregister(&priv->cdev);
1696 mutex_unlock(&rx_queue_mutex);
1697
1698 return 0;
1699 }
1700 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1701
1702 static __init int iscsi_transport_init(void)
1703 {
1704 int err;
1705
1706 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1707 ISCSI_TRANSPORT_VERSION);
1708
1709 atomic_set(&iscsi_session_nr, 0);
1710
1711 err = class_register(&iscsi_transport_class);
1712 if (err)
1713 return err;
1714
1715 err = transport_class_register(&iscsi_host_class);
1716 if (err)
1717 goto unregister_transport_class;
1718
1719 err = transport_class_register(&iscsi_connection_class);
1720 if (err)
1721 goto unregister_host_class;
1722
1723 err = transport_class_register(&iscsi_session_class);
1724 if (err)
1725 goto unregister_conn_class;
1726
1727 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
1728 THIS_MODULE);
1729 if (!nls) {
1730 err = -ENOBUFS;
1731 goto unregister_session_class;
1732 }
1733
1734 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1735 if (!iscsi_eh_timer_workq)
1736 goto release_nls;
1737
1738 return 0;
1739
1740 release_nls:
1741 netlink_kernel_release(nls);
1742 unregister_session_class:
1743 transport_class_unregister(&iscsi_session_class);
1744 unregister_conn_class:
1745 transport_class_unregister(&iscsi_connection_class);
1746 unregister_host_class:
1747 transport_class_unregister(&iscsi_host_class);
1748 unregister_transport_class:
1749 class_unregister(&iscsi_transport_class);
1750 return err;
1751 }
1752
1753 static void __exit iscsi_transport_exit(void)
1754 {
1755 destroy_workqueue(iscsi_eh_timer_workq);
1756 netlink_kernel_release(nls);
1757 transport_class_unregister(&iscsi_connection_class);
1758 transport_class_unregister(&iscsi_session_class);
1759 transport_class_unregister(&iscsi_host_class);
1760 class_unregister(&iscsi_transport_class);
1761 }
1762
1763 module_init(iscsi_transport_init);
1764 module_exit(iscsi_transport_exit);
1765
1766 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1767 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1768 "Alex Aizman <itn780@yahoo.com>");
1769 MODULE_DESCRIPTION("iSCSI Transport Interface");
1770 MODULE_LICENSE("GPL");
1771 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
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