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[SCSI] scsi: add transport host byte errors (v3)
[net-next-2.6.git] / drivers / scsi / scsi_transport_iscsi.c
CommitLineData
0896b752 1/*
1da177e4
LT		 2 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
0896b752
AA		 5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
1da177e4
LT		 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>
0b950672 24#include <linux/mutex.h>
0896b752 25#include <net/tcp.h>
1da177e4
LT		 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>
0896b752 31#include <scsi/iscsi_if.h>
1da177e4 32
88dfd340 33#define ISCSI_SESSION_ATTRS 21
c238c3bb 34#define ISCSI_CONN_ATTRS 13
d8196ed2 35#define ISCSI_HOST_ATTRS 4
d82ff9be 36
4c2133c8 37#define ISCSI_TRANSPORT_VERSION "2.0-870"
1da177e4
LT		 38
39struct iscsi_internal {
790f39a2 40 int daemon_pid;
1da177e4 41 struct scsi_transport_template t;
0896b752
AA		 42 struct iscsi_transport *iscsi_transport;
43 struct list_head list;
ee959b00 44 struct device dev;
30a6c652 45
ee959b00 46 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
0896b752 47 struct transport_container conn_cont;
ee959b00 48 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
0896b752 49 struct transport_container session_cont;
ee959b00 50 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
1da177e4
LT		 51};
52
41be1444 53static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
d8bf541e 54static struct workqueue_struct *iscsi_eh_timer_workq;
b5c7a12d 55
0896b752
AA		 56/*
57 * list of registered transports and lock that must
58 * be held while accessing list. The iscsi_transport_lock must
0b950672 59 * be acquired after the rx_queue_mutex.
0896b752
AA		 60 */
61static LIST_HEAD(iscsi_transports);
62static DEFINE_SPINLOCK(iscsi_transport_lock);
63
64#define to_iscsi_internal(tmpl) \
65 container_of(tmpl, struct iscsi_internal, t)
66
ee959b00
TJ		 67#define dev_to_iscsi_internal(_dev) \
68 container_of(_dev, struct iscsi_internal, dev)
0896b752 69
ee959b00 70static void iscsi_transport_release(struct device *dev)
0896b752 71{
ee959b00 72 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
0896b752
AA		 73 kfree(priv);
74}
1da177e4 75
0896b752
AA		 76/*
77 * iscsi_transport_class represents the iscsi_transports that are
78 * registered.
79 */
80static struct class iscsi_transport_class = {
81 .name = "iscsi_transport",
ee959b00 82 .dev_release = iscsi_transport_release,
0896b752
AA		 83};
84
85static ssize_t
ee959b00
TJ		 86show_transport_handle(struct device *dev, struct device_attribute *attr,
87 char *buf)
0896b752 88{
ee959b00 89 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
762e2bfa 90 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752 91}
ee959b00 92static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
0896b752
AA		 93
94#define show_transport_attr(name, format) \
95static ssize_t \
ee959b00
TJ		 96show_transport_##name(struct device *dev, \
97 struct device_attribute *attr,char *buf) \
0896b752 98{ \
ee959b00 99 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
0896b752
AA		 100 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
101} \
ee959b00 102static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
0896b752
AA		 103
104show_transport_attr(caps, "0x%x");
0896b752
AA		 105
106static struct attribute *iscsi_transport_attrs[] = {
ee959b00
TJ		 107 &dev_attr_handle.attr,
108 &dev_attr_caps.attr,
0896b752
AA		 109 NULL,
110};
111
112static struct attribute_group iscsi_transport_group = {
113 .attrs = iscsi_transport_attrs,
114};
115
d82ff9be
MC		 116/*
117 * iSCSI endpoint attrs
118 */
119#define iscsi_dev_to_endpoint(_dev) \
120 container_of(_dev, struct iscsi_endpoint, dev)
121
122#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
123struct device_attribute dev_attr_##_prefix##_##_name = \
124 __ATTR(_name,_mode,_show,_store)
125
126static void iscsi_endpoint_release(struct device *dev)
127{
128 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
129 kfree(ep);
130}
131
132static struct class iscsi_endpoint_class = {
133 .name = "iscsi_endpoint",
134 .dev_release = iscsi_endpoint_release,
135};
136
137static ssize_t
138show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
139{
140 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
141 return sprintf(buf, "%u\n", ep->id);
142}
143static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
144
145static struct attribute *iscsi_endpoint_attrs[] = {
146 &dev_attr_ep_handle.attr,
147 NULL,
148};
149
150static struct attribute_group iscsi_endpoint_group = {
151 .attrs = iscsi_endpoint_attrs,
152};
153
154#define ISCSI_MAX_EPID -1
155
156static int iscsi_match_epid(struct device *dev, void *data)
157{
158 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
159 unsigned int *epid = (unsigned int *) data;
160
161 return *epid == ep->id;
162}
163
164struct iscsi_endpoint *
165iscsi_create_endpoint(int dd_size)
166{
167 struct device *dev;
168 struct iscsi_endpoint *ep;
169 unsigned int id;
170 int err;
171
172 for (id = 1; id < ISCSI_MAX_EPID; id++) {
695794ae 173 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
d82ff9be
MC		 174 iscsi_match_epid);
175 if (!dev)
176 break;
177 }
178 if (id == ISCSI_MAX_EPID) {
179 printk(KERN_ERR "Too many connections. Max supported %u\n",
180 ISCSI_MAX_EPID - 1);
181 return NULL;
182 }
183
184 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
185 if (!ep)
186 return NULL;
187
188 ep->id = id;
189 ep->dev.class = &iscsi_endpoint_class;
190 snprintf(ep->dev.bus_id, BUS_ID_SIZE, "ep-%u", id);
191 err = device_register(&ep->dev);
192 if (err)
193 goto free_ep;
194
195 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
196 if (err)
197 goto unregister_dev;
198
199 if (dd_size)
200 ep->dd_data = &ep[1];
201 return ep;
202
203unregister_dev:
204 device_unregister(&ep->dev);
205 return NULL;
206
207free_ep:
208 kfree(ep);
209 return NULL;
210}
211EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
212
213void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
214{
215 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
216 device_unregister(&ep->dev);
217}
218EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
219
220struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
221{
f80f868e 222 struct iscsi_endpoint *ep;
d82ff9be
MC		 223 struct device *dev;
224
695794ae 225 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
d82ff9be
MC		 226 iscsi_match_epid);
227 if (!dev)
228 return NULL;
229
f80f868e
MC		 230 ep = iscsi_dev_to_endpoint(dev);
231 /*
232 * we can drop this now because the interface will prevent
233 * removals and lookups from racing.
234 */
235 put_device(dev);
236 return ep;
d82ff9be
MC		 237}
238EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
239
30a6c652 240static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 241 struct device *cdev)
30a6c652
MC		 242{
243 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 244 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 245
246 memset(ihost, 0, sizeof(*ihost));
8aae18ad 247 atomic_set(&ihost->nr_scans, 0);
7970634b 248 mutex_init(&ihost->mutex);
26974789 249
aab0de24
KS		 250 snprintf(ihost->scan_workq_name, sizeof(ihost->scan_workq_name),
251 "iscsi_scan_%d", shost->host_no);
bd976f62
MC		 252 ihost->scan_workq = create_singlethread_workqueue(
253 ihost->scan_workq_name);
254 if (!ihost->scan_workq)
26974789
MC		 255 return -ENOMEM;
256 return 0;
257}
258
259static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
ee959b00 260 struct device *cdev)
26974789
MC		 261{
262 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 263 struct iscsi_cls_host *ihost = shost->shost_data;
26974789 264
bd976f62 265 destroy_workqueue(ihost->scan_workq);
30a6c652
MC		 266 return 0;
267}
268
269static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
270 "iscsi_host",
271 iscsi_setup_host,
26974789 272 iscsi_remove_host,
30a6c652
MC		 273 NULL);
274
0896b752
AA		 275static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
276 "iscsi_session",
1da177e4
LT		 277 NULL,
278 NULL,
279 NULL);
280
0896b752
AA		 281static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
282 "iscsi_connection",
1da177e4
LT		 283 NULL,
284 NULL,
285 NULL);
0896b752
AA		 286
287static struct sock *nls;
0b950672 288static DEFINE_MUTEX(rx_queue_mutex);
0896b752 289
7b7232f3
MC		 290static LIST_HEAD(sesslist);
291static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 292static LIST_HEAD(connlist);
293static DEFINE_SPINLOCK(connlock);
0896b752 294
b5c7a12d
MC		 295static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
296{
297 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
298 return sess->sid;
299}
300
301/*
302 * Returns the matching session to a given sid
303 */
304static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 305{
306 unsigned long flags;
307 struct iscsi_cls_session *sess;
308
309 spin_lock_irqsave(&sesslock, flags);
310 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 311 if (sess->sid == sid) {
7b7232f3
MC		 312 spin_unlock_irqrestore(&sesslock, flags);
313 return sess;
314 }
315 }
316 spin_unlock_irqrestore(&sesslock, flags);
317 return NULL;
318}
319
b5c7a12d
MC		 320/*
321 * Returns the matching connection to a given sid / cid tuple
322 */
323static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 324{
325 unsigned long flags;
326 struct iscsi_cls_conn *conn;
327
328 spin_lock_irqsave(&connlock, flags);
329 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 330 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 331 spin_unlock_irqrestore(&connlock, flags);
332 return conn;
333 }
334 }
335 spin_unlock_irqrestore(&connlock, flags);
336 return NULL;
337}
338
7b8631b5
MC		 339/*
340 * The following functions can be used by LLDs that allocate
341 * their own scsi_hosts or by software iscsi LLDs
342 */
6eabafbe
MC		 343static struct {
344 int value;
345 char *name;
346} iscsi_session_state_names[] = {
347 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
348 { ISCSI_SESSION_FAILED, "FAILED" },
349 { ISCSI_SESSION_FREE, "FREE" },
350};
351
3b0f208a 352static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 353{
354 int i;
355 char *name = NULL;
356
357 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
358 if (iscsi_session_state_names[i].value == state) {
359 name = iscsi_session_state_names[i].name;
360 break;
361 }
362 }
363 return name;
364}
365
366int iscsi_session_chkready(struct iscsi_cls_session *session)
367{
368 unsigned long flags;
369 int err;
370
371 spin_lock_irqsave(&session->lock, flags);
372 switch (session->state) {
373 case ISCSI_SESSION_LOGGED_IN:
374 err = 0;
375 break;
376 case ISCSI_SESSION_FAILED:
377 err = DID_IMM_RETRY << 16;
378 break;
379 case ISCSI_SESSION_FREE:
380 err = DID_NO_CONNECT << 16;
381 break;
382 default:
383 err = DID_NO_CONNECT << 16;
384 break;
385 }
386 spin_unlock_irqrestore(&session->lock, flags);
387 return err;
388}
389EXPORT_SYMBOL_GPL(iscsi_session_chkready);
390
7b8631b5
MC		 391static void iscsi_session_release(struct device *dev)
392{
393 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 394 struct Scsi_Host *shost;
0896b752 395
7b8631b5
MC		 396 shost = iscsi_session_to_shost(session);
397 scsi_host_put(shost);
398 kfree(session);
7b8631b5 399}
0896b752 400
7b8631b5
MC		 401static int iscsi_is_session_dev(const struct device *dev)
402{
403 return dev->release == iscsi_session_release;
404}
0896b752 405
a4804cd6
MC		 406static int iscsi_iter_session_fn(struct device *dev, void *data)
407{
408 void (* fn) (struct iscsi_cls_session *) = data;
409
410 if (!iscsi_is_session_dev(dev))
411 return 0;
412 fn(iscsi_dev_to_session(dev));
413 return 0;
414}
415
416void iscsi_host_for_each_session(struct Scsi_Host *shost,
417 void (*fn)(struct iscsi_cls_session *))
418{
419 device_for_each_child(&shost->shost_gendev, fn,
420 iscsi_iter_session_fn);
421}
422EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
423
8aae18ad
MC		 424/**
425 * iscsi_scan_finished - helper to report when running scans are done
426 * @shost: scsi host
427 * @time: scan run time
428 *
429 * This function can be used by drives like qla4xxx to report to the scsi
430 * layer when the scans it kicked off at module load time are done.
431 */
432int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
433{
32c6e1b9 434 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 435 /*
436 * qla4xxx will have kicked off some session unblocks before calling
437 * scsi_scan_host, so just wait for them to complete.
438 */
439 return !atomic_read(&ihost->nr_scans);
440}
441EXPORT_SYMBOL_GPL(iscsi_scan_finished);
442
7970634b
MC		 443struct iscsi_scan_data {
444 unsigned int channel;
445 unsigned int id;
446 unsigned int lun;
447};
448
449static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 450{
7970634b 451 struct iscsi_scan_data *scan_data = data;
30a6c652 452 struct iscsi_cls_session *session;
7970634b
MC		 453 struct Scsi_Host *shost;
454 struct iscsi_cls_host *ihost;
455 unsigned long flags;
456 unsigned int id;
457
458 if (!iscsi_is_session_dev(dev))
459 return 0;
460
461 session = iscsi_dev_to_session(dev);
462 shost = iscsi_session_to_shost(session);
463 ihost = shost->shost_data;
30a6c652
MC		 464
465 mutex_lock(&ihost->mutex);
7970634b
MC		 466 spin_lock_irqsave(&session->lock, flags);
467 if (session->state != ISCSI_SESSION_LOGGED_IN) {
468 spin_unlock_irqrestore(&session->lock, flags);
469 mutex_unlock(&ihost->mutex);
470 return 0;
30a6c652 471 }
7970634b
MC		 472 id = session->target_id;
473 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 474
7970634b
MC		 475 if (id != ISCSI_MAX_TARGET) {
476 if ((scan_data->channel == SCAN_WILD_CARD ||
477 scan_data->channel == 0) &&
478 (scan_data->id == SCAN_WILD_CARD ||
479 scan_data->id == id))
480 scsi_scan_target(&session->dev, 0, id,
481 scan_data->lun, 1);
482 }
483 mutex_unlock(&ihost->mutex);
30a6c652
MC		 484 return 0;
485}
486
7970634b
MC		 487static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
488 uint id, uint lun)
489{
490 struct iscsi_scan_data scan_data;
491
492 scan_data.channel = channel;
493 scan_data.id = id;
494 scan_data.lun = lun;
495
496 return device_for_each_child(&shost->shost_gendev, &scan_data,
497 iscsi_user_scan_session);
498}
499
bd976f62
MC		 500static void iscsi_scan_session(struct work_struct *work)
501{
502 struct iscsi_cls_session *session =
503 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 504 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 505 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 506 struct iscsi_scan_data scan_data;
bd976f62 507
7970634b
MC		 508 scan_data.channel = 0;
509 scan_data.id = SCAN_WILD_CARD;
510 scan_data.lun = SCAN_WILD_CARD;
bd976f62 511
7970634b 512 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 513 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 514}
515
c4028958 516static void session_recovery_timedout(struct work_struct *work)
30a6c652 517{
c4028958
DH		 518 struct iscsi_cls_session *session =
519 container_of(work, struct iscsi_cls_session,
520 recovery_work.work);
6eabafbe 521 unsigned long flags;
30a6c652 522
322d739d
MC		 523 iscsi_cls_session_printk(KERN_INFO, session,
524 "session recovery timed out after %d secs\n",
525 session->recovery_tmo);
30a6c652 526
6eabafbe
MC		 527 spin_lock_irqsave(&session->lock, flags);
528 switch (session->state) {
529 case ISCSI_SESSION_FAILED:
530 session->state = ISCSI_SESSION_FREE;
531 break;
532 case ISCSI_SESSION_LOGGED_IN:
533 case ISCSI_SESSION_FREE:
534 /* we raced with the unblock's flush */
535 spin_unlock_irqrestore(&session->lock, flags);
536 return;
537 }
538 spin_unlock_irqrestore(&session->lock, flags);
539
30a6c652
MC		 540 if (session->transport->session_recovery_timedout)
541 session->transport->session_recovery_timedout(session);
542
543 scsi_target_unblock(&session->dev);
544}
545
45ab33b6 546static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 547{
45ab33b6
MC		 548 struct iscsi_cls_session *session =
549 container_of(work, struct iscsi_cls_session,
550 unblock_work);
bd976f62 551 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 552 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 553 unsigned long flags;
554
45ab33b6
MC		 555 /*
556 * The recovery and unblock work get run from the same workqueue,
557 * so try to cancel it if it was going to run after this unblock.
558 */
559 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 560 spin_lock_irqsave(&session->lock, flags);
561 session->state = ISCSI_SESSION_LOGGED_IN;
562 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 563 /* start IO */
564 scsi_target_unblock(&session->dev);
8aae18ad
MC		 565 /*
566 * Only do kernel scanning if the driver is properly hooked into
567 * the async scanning code (drivers like iscsi_tcp do login and
568 * scanning from userspace).
569 */
570 if (shost->hostt->scan_finished) {
571 if (queue_work(ihost->scan_workq, &session->scan_work))
572 atomic_inc(&ihost->nr_scans);
573 }
6eabafbe 574}
45ab33b6
MC		 575
576/**
577 * iscsi_unblock_session - set a session as logged in and start IO.
578 * @session: iscsi session
579 *
580 * Mark a session as ready to accept IO.
581 */
582void iscsi_unblock_session(struct iscsi_cls_session *session)
583{
584 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
585 /*
586 * make sure all the events have completed before tell the driver
587 * it is safe
588 */
589 flush_workqueue(iscsi_eh_timer_workq);
590}
30a6c652
MC		 591EXPORT_SYMBOL_GPL(iscsi_unblock_session);
592
45ab33b6 593static void __iscsi_block_session(struct work_struct *work)
30a6c652 594{
45ab33b6
MC		 595 struct iscsi_cls_session *session =
596 container_of(work, struct iscsi_cls_session,
597 block_work);
6eabafbe
MC		 598 unsigned long flags;
599
600 spin_lock_irqsave(&session->lock, flags);
601 session->state = ISCSI_SESSION_FAILED;
602 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 603 scsi_target_block(&session->dev);
d8bf541e
MC		 604 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
605 session->recovery_tmo * HZ);
30a6c652 606}
45ab33b6
MC		 607
608void iscsi_block_session(struct iscsi_cls_session *session)
609{
610 queue_work(iscsi_eh_timer_workq, &session->block_work);
611}
30a6c652
MC		 612EXPORT_SYMBOL_GPL(iscsi_block_session);
613
26974789
MC		 614static void __iscsi_unbind_session(struct work_struct *work)
615{
616 struct iscsi_cls_session *session =
617 container_of(work, struct iscsi_cls_session,
618 unbind_work);
619 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 620 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 621 unsigned long flags;
26974789
MC		 622
623 /* Prevent new scans and make sure scanning is not in progress */
624 mutex_lock(&ihost->mutex);
7970634b
MC		 625 spin_lock_irqsave(&session->lock, flags);
626 if (session->target_id == ISCSI_MAX_TARGET) {
627 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 628 mutex_unlock(&ihost->mutex);
629 return;
630 }
7970634b
MC		 631 session->target_id = ISCSI_MAX_TARGET;
632 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 633 mutex_unlock(&ihost->mutex);
634
635 scsi_remove_target(&session->dev);
636 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
637}
638
639static int iscsi_unbind_session(struct iscsi_cls_session *session)
640{
641 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 642 struct iscsi_cls_host *ihost = shost->shost_data;
26974789 643
bd976f62 644 return queue_work(ihost->scan_workq, &session->unbind_work);
26974789
MC		 645}
646
7b8631b5 647struct iscsi_cls_session *
5d91e209
MC		 648iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
649 int dd_size)
7b8631b5
MC		 650{
651 struct iscsi_cls_session *session;
7b8631b5 652
5d91e209 653 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 654 GFP_KERNEL);
7b8631b5 655 if (!session)
f53a88da
MC		 656 return NULL;
657
7b8631b5 658 session->transport = transport;
30a6c652 659 session->recovery_tmo = 120;
6eabafbe 660 session->state = ISCSI_SESSION_FREE;
c4028958 661 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 662 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 663 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
664 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 665 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 666 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 667 spin_lock_init(&session->lock);
7b8631b5 668
6a8a0d36
MC		 669 /* this is released in the dev's release function */
670 scsi_host_get(shost);
8434aa8b
MC		 671 session->dev.parent = &shost->shost_gendev;
672 session->dev.release = iscsi_session_release;
673 device_initialize(&session->dev);
5d91e209 674 if (dd_size)
b5c7a12d 675 session->dd_data = &session[1];
8434aa8b
MC		 676 return session;
677}
678EXPORT_SYMBOL_GPL(iscsi_alloc_session);
679
7970634b
MC		 680static int iscsi_get_next_target_id(struct device *dev, void *data)
681{
682 struct iscsi_cls_session *session;
683 unsigned long flags;
684 int err = 0;
685
686 if (!iscsi_is_session_dev(dev))
687 return 0;
688
689 session = iscsi_dev_to_session(dev);
690 spin_lock_irqsave(&session->lock, flags);
691 if (*((unsigned int *) data) == session->target_id)
692 err = -EEXIST;
693 spin_unlock_irqrestore(&session->lock, flags);
694 return err;
695}
696
6a8a0d36 697int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 698{
699 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 700 struct iscsi_cls_host *ihost;
26974789 701 unsigned long flags;
7970634b 702 unsigned int id = target_id;
8434aa8b 703 int err;
b5c7a12d 704
30a6c652 705 ihost = shost->shost_data;
41be1444 706 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 707
708 if (id == ISCSI_MAX_TARGET) {
709 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
710 err = device_for_each_child(&shost->shost_gendev, &id,
711 iscsi_get_next_target_id);
712 if (!err)
713 break;
714 }
715
716 if (id == ISCSI_MAX_TARGET) {
717 iscsi_cls_session_printk(KERN_ERR, session,
718 "Too many iscsi targets. Max "
719 "number of targets is %d.\n",
720 ISCSI_MAX_TARGET - 1);
721 goto release_host;
722 }
723 }
724 session->target_id = id;
30a6c652 725
b5c7a12d
MC		 726 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
727 session->sid);
8434aa8b 728 err = device_add(&session->dev);
7b8631b5 729 if (err) {
322d739d
MC		 730 iscsi_cls_session_printk(KERN_ERR, session,
731 "could not register session's dev\n");
8434aa8b 732 goto release_host;
7b8631b5
MC		 733 }
734 transport_register_device(&session->dev);
735
26974789
MC		 736 spin_lock_irqsave(&sesslock, flags);
737 list_add(&session->sess_list, &sesslist);
738 spin_unlock_irqrestore(&sesslock, flags);
739
26974789 740 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
8434aa8b 741 return 0;
30a6c652 742
8434aa8b
MC		 743release_host:
744 scsi_host_put(shost);
745 return err;
7b8631b5 746}
8434aa8b 747EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 748
749/**
8434aa8b
MC		 750 * iscsi_create_session - create iscsi class session
751 * @shost: scsi host
752 * @transport: iscsi transport
5d91e209 753 * @dd_size: private driver data size
eb44820c 754 * @target_id: which target
7b8631b5 755 *
8434aa8b 756 * This can be called from a LLD or iscsi_transport.
eb44820c 757 */
8434aa8b 758struct iscsi_cls_session *
5d91e209
MC		 759iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
760 int dd_size, unsigned int target_id)
8434aa8b
MC		 761{
762 struct iscsi_cls_session *session;
763
5d91e209 764 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 765 if (!session)
766 return NULL;
767
6a8a0d36 768 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 769 iscsi_free_session(session);
770 return NULL;
771 }
772 return session;
773}
774EXPORT_SYMBOL_GPL(iscsi_create_session);
775
26974789
MC		 776static void iscsi_conn_release(struct device *dev)
777{
778 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
779 struct device *parent = conn->dev.parent;
780
781 kfree(conn);
782 put_device(parent);
783}
784
785static int iscsi_is_conn_dev(const struct device *dev)
786{
787 return dev->release == iscsi_conn_release;
788}
789
790static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
791{
792 if (!iscsi_is_conn_dev(dev))
793 return 0;
794 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
795}
796
8434aa8b 797void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 798{
30a6c652 799 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 800 struct iscsi_cls_host *ihost = shost->shost_data;
26974789
MC		 801 unsigned long flags;
802 int err;
803
804 spin_lock_irqsave(&sesslock, flags);
805 list_del(&session->sess_list);
806 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 807
45ab33b6
MC		 808 /* make sure there are no blocks/unblocks queued */
809 flush_workqueue(iscsi_eh_timer_workq);
810 /* make sure the timedout callout is not running */
811 if (!cancel_delayed_work(&session->recovery_work))
812 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 813 /*
814 * If we are blocked let commands flow again. The lld or iscsi
815 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 816 * We assume that LLD will not be calling block/unblock while
817 * removing the session.
26974789 818 */
6eabafbe
MC		 819 spin_lock_irqsave(&session->lock, flags);
820 session->state = ISCSI_SESSION_FREE;
821 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 822
45ab33b6
MC		 823 scsi_target_unblock(&session->dev);
824 /* flush running scans then delete devices */
bd976f62 825 flush_workqueue(ihost->scan_workq);
45ab33b6 826 __iscsi_unbind_session(&session->unbind_work);
30a6c652 827
26974789
MC		 828 /* hw iscsi may not have removed all connections from session */
829 err = device_for_each_child(&session->dev, NULL,
830 iscsi_iter_destroy_conn_fn);
831 if (err)
322d739d
MC		 832 iscsi_cls_session_printk(KERN_ERR, session,
833 "Could not delete all connections "
834 "for session. Error %d.\n", err);
8434aa8b 835
7b8631b5 836 transport_unregister_device(&session->dev);
8434aa8b
MC		 837 device_del(&session->dev);
838}
839EXPORT_SYMBOL_GPL(iscsi_remove_session);
840
841void iscsi_free_session(struct iscsi_cls_session *session)
842{
26974789 843 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 844 put_device(&session->dev);
7b8631b5 845}
8434aa8b
MC		 846EXPORT_SYMBOL_GPL(iscsi_free_session);
847
848/**
849 * iscsi_destroy_session - destroy iscsi session
850 * @session: iscsi_session
851 *
852 * Can be called by a LLD or iscsi_transport. There must not be
853 * any running connections.
eb44820c 854 */
8434aa8b
MC		 855int iscsi_destroy_session(struct iscsi_cls_session *session)
856{
857 iscsi_remove_session(session);
858 iscsi_free_session(session);
859 return 0;
860}
7b8631b5
MC		 861EXPORT_SYMBOL_GPL(iscsi_destroy_session);
862
7b8631b5
MC		 863/**
864 * iscsi_create_conn - create iscsi class connection
865 * @session: iscsi cls session
5d91e209 866 * @dd_size: private driver data size
7b8631b5
MC		 867 * @cid: connection id
868 *
869 * This can be called from a LLD or iscsi_transport. The connection
870 * is child of the session so cid must be unique for all connections
871 * on the session.
b5c7a12d
MC		 872 *
873 * Since we do not support MCS, cid will normally be zero. In some cases
874 * for software iscsi we could be trying to preallocate a connection struct
875 * in which case there could be two connection structs and cid would be
876 * non-zero.
eb44820c 877 */
7b8631b5 878struct iscsi_cls_conn *
5d91e209 879iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 880{
881 struct iscsi_transport *transport = session->transport;
7b8631b5 882 struct iscsi_cls_conn *conn;
26974789 883 unsigned long flags;
7b8631b5
MC		 884 int err;
885
5d91e209 886 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 887 if (!conn)
888 return NULL;
5d91e209 889 if (dd_size)
7b8631b5
MC		 890 conn->dd_data = &conn[1];
891
892 INIT_LIST_HEAD(&conn->conn_list);
893 conn->transport = transport;
b5c7a12d 894 conn->cid = cid;
7b8631b5
MC		 895
896 /* this is released in the dev's release function */
897 if (!get_device(&session->dev))
43a145a3 898 goto free_conn;
b5c7a12d 899
7b8631b5 900 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
b5c7a12d 901 session->sid, cid);
7b8631b5
MC		 902 conn->dev.parent = &session->dev;
903 conn->dev.release = iscsi_conn_release;
904 err = device_register(&conn->dev);
905 if (err) {
322d739d
MC		 906 iscsi_cls_session_printk(KERN_ERR, session, "could not "
907 "register connection's dev\n");
7b8631b5
MC		 908 goto release_parent_ref;
909 }
910 transport_register_device(&conn->dev);
26974789
MC		 911
912 spin_lock_irqsave(&connlock, flags);
913 list_add(&conn->conn_list, &connlist);
914 conn->active = 1;
915 spin_unlock_irqrestore(&connlock, flags);
7b8631b5
MC		 916 return conn;
917
918release_parent_ref:
919 put_device(&session->dev);
920free_conn:
921 kfree(conn);
922 return NULL;
923}
924
925EXPORT_SYMBOL_GPL(iscsi_create_conn);
926
927/**
928 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 929 * @conn: iscsi cls session
7b8631b5 930 *
26974789 931 * This can be called from a LLD or iscsi_transport.
eb44820c 932 */
7b8631b5
MC		 933int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
934{
26974789
MC		 935 unsigned long flags;
936
937 spin_lock_irqsave(&connlock, flags);
938 conn->active = 0;
939 list_del(&conn->conn_list);
940 spin_unlock_irqrestore(&connlock, flags);
941
7b8631b5
MC		 942 transport_unregister_device(&conn->dev);
943 device_unregister(&conn->dev);
944 return 0;
945}
7b8631b5
MC		 946EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
947
7b8631b5
MC		 948/*
949 * iscsi interface functions
950 */
0896b752
AA		 951static struct iscsi_internal *
952iscsi_if_transport_lookup(struct iscsi_transport *tt)
953{
954 struct iscsi_internal *priv;
955 unsigned long flags;
956
957 spin_lock_irqsave(&iscsi_transport_lock, flags);
958 list_for_each_entry(priv, &iscsi_transports, list) {
959 if (tt == priv->iscsi_transport) {
960 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
961 return priv;
962 }
963 }
964 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
965 return NULL;
966}
1da177e4 967
53cb8a1f 968static int
43a145a3 969iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
53cb8a1f 970{
53cb8a1f
MC		 971 int rc;
972
9aaa2b46 973 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
53cb8a1f 974 if (rc < 0) {
53cb8a1f
MC		 975 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
976 return rc;
977 }
978
53cb8a1f
MC		 979 return 0;
980}
981
0896b752 982static int
43a145a3 983iscsi_unicast_skb(struct sk_buff *skb, int pid)
0896b752 984{
0896b752 985 int rc;
1da177e4 986
790f39a2 987 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
0896b752 988 if (rc < 0) {
0896b752
AA		 989 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
990 return rc;
991 }
992
0896b752 993 return 0;
1da177e4 994}
1da177e4 995
7b7232f3 996int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 997 char *data, uint32_t data_size)
1da177e4 998{
0896b752
AA		 999 struct nlmsghdr *nlh;
1000 struct sk_buff *skb;
1001 struct iscsi_uevent *ev;
0896b752 1002 char *pdu;
790f39a2 1003 struct iscsi_internal *priv;
0896b752
AA		 1004 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1005 data_size);
1006
790f39a2
MC		 1007 priv = iscsi_if_transport_lookup(conn->transport);
1008 if (!priv)
1009 return -EINVAL;
1010
43a145a3 1011 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1012 if (!skb) {
7b7232f3 1013 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1014 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1015 "control PDU: OOM\n");
0896b752
AA		 1016 return -ENOMEM;
1017 }
1da177e4 1018
790f39a2 1019 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1020 ev = NLMSG_DATA(nlh);
1021 memset(ev, 0, sizeof(*ev));
1022 ev->transport_handle = iscsi_handle(conn->transport);
1023 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1024 ev->r.recv_req.cid = conn->cid;
1025 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1026 pdu = (char*)ev + sizeof(*ev);
1027 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1028 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1029
43a145a3 1030 return iscsi_unicast_skb(skb, priv->daemon_pid);
1da177e4 1031}
0896b752 1032EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1033
7b7232f3 1034void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1035{
0896b752
AA		 1036 struct nlmsghdr *nlh;
1037 struct sk_buff *skb;
1038 struct iscsi_uevent *ev;
790f39a2 1039 struct iscsi_internal *priv;
0896b752
AA		 1040 int len = NLMSG_SPACE(sizeof(*ev));
1041
790f39a2
MC		 1042 priv = iscsi_if_transport_lookup(conn->transport);
1043 if (!priv)
1044 return;
1045
43a145a3 1046 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1047 if (!skb) {
322d739d
MC		 1048 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1049 "conn error (%d)\n", error);
0896b752
AA		 1050 return;
1051 }
1052
790f39a2 1053 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1054 ev = NLMSG_DATA(nlh);
1055 ev->transport_handle = iscsi_handle(conn->transport);
1056 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1057 ev->r.connerror.error = error;
b5c7a12d
MC		 1058 ev->r.connerror.cid = conn->cid;
1059 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1060
43a145a3 1061 iscsi_broadcast_skb(skb, GFP_ATOMIC);
1da177e4 1062
322d739d
MC		 1063 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1064 error);
0896b752
AA		 1065}
1066EXPORT_SYMBOL_GPL(iscsi_conn_error);
1067
1068static int
1069iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1070 void *payload, int size)
1071{
1072 struct sk_buff *skb;
1073 struct nlmsghdr *nlh;
1074 int len = NLMSG_SPACE(size);
1075 int flags = multi ? NLM_F_MULTI : 0;
1076 int t = done ? NLMSG_DONE : type;
1077
43a145a3 1078 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1079 if (!skb) {
1080 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1081 return -ENOMEM;
1082 }
0896b752
AA		 1083
1084 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1085 nlh->nlmsg_flags = flags;
1086 memcpy(NLMSG_DATA(nlh), payload, size);
43a145a3 1087 return iscsi_unicast_skb(skb, pid);
1da177e4 1088}
1da177e4 1089
7b8631b5 1090static int
5b940adf 1091iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1092{
1093 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1094 struct iscsi_stats *stats;
1095 struct sk_buff *skbstat;
1096 struct iscsi_cls_conn *conn;
1097 struct nlmsghdr *nlhstat;
1098 struct iscsi_uevent *evstat;
790f39a2 1099 struct iscsi_internal *priv;
7b8631b5
MC		 1100 int len = NLMSG_SPACE(sizeof(*ev) +
1101 sizeof(struct iscsi_stats) +
1102 sizeof(struct iscsi_stats_custom) *
1103 ISCSI_STATS_CUSTOM_MAX);
1104 int err = 0;
0896b752 1105
790f39a2
MC		 1106 priv = iscsi_if_transport_lookup(transport);
1107 if (!priv)
1108 return -EINVAL;
1109
b5c7a12d 1110 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1111 if (!conn)
1112 return -EEXIST;
0896b752 1113
7b8631b5
MC		 1114 do {
1115 int actual_size;
0896b752 1116
43a145a3 1117 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1118 if (!skbstat) {
322d739d
MC		 1119 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1120 "deliver stats: OOM\n");
7b8631b5
MC		 1121 return -ENOMEM;
1122 }
1123
790f39a2 1124 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
7b8631b5
MC		 1125 (len - sizeof(*nlhstat)), 0);
1126 evstat = NLMSG_DATA(nlhstat);
1127 memset(evstat, 0, sizeof(*evstat));
1128 evstat->transport_handle = iscsi_handle(conn->transport);
1129 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1130 evstat->u.get_stats.cid =
1131 ev->u.get_stats.cid;
1132 evstat->u.get_stats.sid =
1133 ev->u.get_stats.sid;
7b8631b5
MC		 1134 stats = (struct iscsi_stats *)
1135 ((char*)evstat + sizeof(*evstat));
1136 memset(stats, 0, sizeof(*stats));
1137
7b7232f3 1138 transport->get_stats(conn, stats);
7b8631b5
MC		 1139 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1140 sizeof(struct iscsi_stats) +
1141 sizeof(struct iscsi_stats_custom) *
1142 stats->custom_length);
1143 actual_size -= sizeof(*nlhstat);
1144 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1145 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1146 nlhstat->nlmsg_len = actual_size;
1147
43a145a3 1148 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
7b8631b5
MC		 1149 } while (err < 0 && err != -ECONNREFUSED);
1150
1151 return err;
0896b752
AA		 1152}
1153
53cb8a1f 1154/**
26974789
MC		 1155 * iscsi_session_event - send session destr. completion event
1156 * @session: iscsi class session
1157 * @event: type of event
eb44820c 1158 */
26974789
MC		 1159int iscsi_session_event(struct iscsi_cls_session *session,
1160 enum iscsi_uevent_e event)
53cb8a1f
MC		 1161{
1162 struct iscsi_internal *priv;
53cb8a1f
MC		 1163 struct Scsi_Host *shost;
1164 struct iscsi_uevent *ev;
1165 struct sk_buff *skb;
1166 struct nlmsghdr *nlh;
53cb8a1f
MC		 1167 int rc, len = NLMSG_SPACE(sizeof(*ev));
1168
26974789 1169 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1170 if (!priv)
1171 return -EINVAL;
53cb8a1f
MC		 1172 shost = iscsi_session_to_shost(session);
1173
43a145a3 1174 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1175 if (!skb) {
322d739d
MC		 1176 iscsi_cls_session_printk(KERN_ERR, session,
1177 "Cannot notify userspace of session "
1178 "event %u\n", event);
53cb8a1f
MC		 1179 return -ENOMEM;
1180 }
1181
1182 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1183 ev = NLMSG_DATA(nlh);
26974789 1184 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1185
26974789
MC		 1186 ev->type = event;
1187 switch (event) {
1188 case ISCSI_KEVENT_DESTROY_SESSION:
1189 ev->r.d_session.host_no = shost->host_no;
1190 ev->r.d_session.sid = session->sid;
1191 break;
1192 case ISCSI_KEVENT_CREATE_SESSION:
1193 ev->r.c_session_ret.host_no = shost->host_no;
1194 ev->r.c_session_ret.sid = session->sid;
1195 break;
1196 case ISCSI_KEVENT_UNBIND_SESSION:
1197 ev->r.unbind_session.host_no = shost->host_no;
1198 ev->r.unbind_session.sid = session->sid;
1199 break;
1200 default:
322d739d
MC		 1201 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1202 "%u.\n", event);
26974789 1203 kfree_skb(skb);
53cb8a1f 1204 return -EINVAL;
53cb8a1f
MC		 1205 }
1206
53cb8a1f
MC		 1207 /*
1208 * this will occur if the daemon is not up, so we just warn
1209 * the user and when the daemon is restarted it will handle it
1210 */
43a145a3 1211 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
53cb8a1f 1212 if (rc < 0)
322d739d
MC		 1213 iscsi_cls_session_printk(KERN_ERR, session,
1214 "Cannot notify userspace of session "
1215 "event %u. Check iscsi daemon\n",
1216 event);
53cb8a1f
MC		 1217 return rc;
1218}
26974789 1219EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1220
0896b752 1221static int
d82ff9be
MC		 1222iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1223 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1224 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1225{
1226 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1227 struct iscsi_cls_session *session;
d82ff9be 1228 uint32_t host_no;
0896b752 1229
d82ff9be 1230 session = transport->create_session(ep, cmds_max, queue_depth,
40753caa 1231 initial_cmdsn, &host_no);
7b7232f3 1232 if (!session)
7b8631b5 1233 return -ENOMEM;
0896b752 1234
40753caa 1235 ev->r.c_session_ret.host_no = host_no;
b5c7a12d 1236 ev->r.c_session_ret.sid = session->sid;
0896b752 1237 return 0;
0896b752
AA		 1238}
1239
1240static int
7b7232f3 1241iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1242{
7b8631b5 1243 struct iscsi_cls_conn *conn;
7b7232f3 1244 struct iscsi_cls_session *session;
7b8631b5 1245
b5c7a12d
MC		 1246 session = iscsi_session_lookup(ev->u.c_conn.sid);
1247 if (!session) {
322d739d 1248 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1249 ev->u.c_conn.sid);
7b8631b5 1250 return -EINVAL;
b5c7a12d 1251 }
0896b752 1252
7b7232f3 1253 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1254 if (!conn) {
322d739d
MC		 1255 iscsi_cls_session_printk(KERN_ERR, session,
1256 "couldn't create a new connection.");
7b7232f3 1257 return -ENOMEM;
b5c7a12d 1258 }
0896b752 1259
b5c7a12d
MC		 1260 ev->r.c_conn_ret.sid = session->sid;
1261 ev->r.c_conn_ret.cid = conn->cid;
0896b752 1262 return 0;
1da177e4
LT		 1263}
1264
0896b752
AA		 1265static int
1266iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1267{
7b8631b5 1268 struct iscsi_cls_conn *conn;
0896b752 1269
b5c7a12d 1270 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1271 if (!conn)
7b8631b5 1272 return -EINVAL;
0896b752 1273
7b8631b5
MC		 1274 if (transport->destroy_conn)
1275 transport->destroy_conn(conn);
7b8631b5 1276 return 0;
0896b752
AA		 1277}
1278
fd7255f5
MC		 1279static int
1280iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1281{
1282 char *data = (char*)ev + sizeof(*ev);
1283 struct iscsi_cls_conn *conn;
1284 struct iscsi_cls_session *session;
a54a52ca 1285 int err = 0, value = 0;
fd7255f5
MC		 1286
1287 session = iscsi_session_lookup(ev->u.set_param.sid);
1288 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1289 if (!conn || !session)
1290 return -EINVAL;
1291
1292 switch (ev->u.set_param.param) {
30a6c652 1293 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1294 sscanf(data, "%d", &value);
30a6c652
MC		 1295 if (value != 0)
1296 session->recovery_tmo = value;
1297 break;
fd7255f5 1298 default:
a54a52ca
MC		 1299 err = transport->set_param(conn, ev->u.set_param.param,
1300 data, ev->u.set_param.len);
fd7255f5
MC		 1301 }
1302
1303 return err;
1304}
1305
264faaaa
OG		 1306static int
1307iscsi_if_transport_ep(struct iscsi_transport *transport,
1308 struct iscsi_uevent *ev, int msg_type)
1309{
d82ff9be 1310 struct iscsi_endpoint *ep;
264faaaa
OG		 1311 struct sockaddr *dst_addr;
1312 int rc = 0;
1313
1314 switch (msg_type) {
1315 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1316 if (!transport->ep_connect)
1317 return -EINVAL;
1318
1319 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
d82ff9be
MC		 1320 ep = transport->ep_connect(dst_addr,
1321 ev->u.ep_connect.non_blocking);
1322 if (IS_ERR(ep))
1323 return PTR_ERR(ep);
1324
1325 ev->r.ep_connect_ret.handle = ep->id;
264faaaa
OG		 1326 break;
1327 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1328 if (!transport->ep_poll)
1329 return -EINVAL;
1330
d82ff9be
MC		 1331 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1332 if (!ep)
1333 return -EINVAL;
1334
1335 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1336 ev->u.ep_poll.timeout_ms);
1337 break;
1338 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1339 if (!transport->ep_disconnect)
1340 return -EINVAL;
1341
d82ff9be
MC		 1342 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1343 if (!ep)
1344 return -EINVAL;
1345
1346 transport->ep_disconnect(ep);
264faaaa
OG		 1347 break;
1348 }
1349 return rc;
1350}
1351
01cb225d
MC		 1352static int
1353iscsi_tgt_dscvr(struct iscsi_transport *transport,
1354 struct iscsi_uevent *ev)
1355{
2174a04e 1356 struct Scsi_Host *shost;
01cb225d 1357 struct sockaddr *dst_addr;
2174a04e 1358 int err;
01cb225d
MC		 1359
1360 if (!transport->tgt_dscvr)
1361 return -EINVAL;
1362
2174a04e 1363 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1364 if (!shost) {
2174a04e
MC		 1365 printk(KERN_ERR "target discovery could not find host no %u\n",
1366 ev->u.tgt_dscvr.host_no);
1367 return -ENODEV;
1368 }
1369
1370
01cb225d 1371 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1372 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1373 ev->u.tgt_dscvr.enable, dst_addr);
1374 scsi_host_put(shost);
1375 return err;
01cb225d
MC		 1376}
1377
1d9bf13a
MC		 1378static int
1379iscsi_set_host_param(struct iscsi_transport *transport,
1380 struct iscsi_uevent *ev)
1381{
1382 char *data = (char*)ev + sizeof(*ev);
1383 struct Scsi_Host *shost;
1384 int err;
1385
1386 if (!transport->set_host_param)
1387 return -ENOSYS;
1388
1389 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1390 if (!shost) {
1d9bf13a
MC		 1391 printk(KERN_ERR "set_host_param could not find host no %u\n",
1392 ev->u.set_host_param.host_no);
1393 return -ENODEV;
1394 }
1395
1396 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1397 data, ev->u.set_host_param.len);
1398 scsi_host_put(shost);
1399 return err;
1400}
1401
0896b752
AA		 1402static int
1403iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1404{
1405 int err = 0;
1406 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1407 struct iscsi_transport *transport = NULL;
1408 struct iscsi_internal *priv;
7b7232f3
MC		 1409 struct iscsi_cls_session *session;
1410 struct iscsi_cls_conn *conn;
d82ff9be 1411 struct iscsi_endpoint *ep = NULL;
0896b752 1412
0896b752
AA		 1413 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1414 if (!priv)
1415 return -EINVAL;
1416 transport = priv->iscsi_transport;
1417
7b7232f3
MC		 1418 if (!try_module_get(transport->owner))
1419 return -EINVAL;
1420
790f39a2
MC		 1421 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1422
0896b752
AA		 1423 switch (nlh->nlmsg_type) {
1424 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1425 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1426 ev->u.c_session.initial_cmdsn,
1427 ev->u.c_session.cmds_max,
1428 ev->u.c_session.queue_depth);
1429 break;
1430 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1431 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1432 if (!ep) {
1433 err = -EINVAL;
1434 break;
1435 }
d82ff9be
MC		 1436
1437 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1438 ev->u.c_bound_session.initial_cmdsn,
1439 ev->u.c_bound_session.cmds_max,
1440 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1441 break;
1442 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1443 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1444 if (session)
7b7232f3 1445 transport->destroy_session(session);
26974789
MC		 1446 else
1447 err = -EINVAL;
1448 break;
1449 case ISCSI_UEVENT_UNBIND_SESSION:
1450 session = iscsi_session_lookup(ev->u.d_session.sid);
1451 if (session)
1452 iscsi_unbind_session(session);
1453 else
7b7232f3 1454 err = -EINVAL;
0896b752
AA		 1455 break;
1456 case ISCSI_UEVENT_CREATE_CONN:
1457 err = iscsi_if_create_conn(transport, ev);
1458 break;
1459 case ISCSI_UEVENT_DESTROY_CONN:
1460 err = iscsi_if_destroy_conn(transport, ev);
1461 break;
1462 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1463 session = iscsi_session_lookup(ev->u.b_conn.sid);
1464 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3
MC		 1465
1466 if (session && conn)
1467 ev->r.retcode = transport->bind_conn(session, conn,
264faaaa 1468 ev->u.b_conn.transport_eph,
7b7232f3
MC		 1469 ev->u.b_conn.is_leading);
1470 else
1471 err = -EINVAL;
0896b752
AA		 1472 break;
1473 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 1474 err = iscsi_set_param(transport, ev);
0896b752
AA		 1475 break;
1476 case ISCSI_UEVENT_START_CONN:
b5c7a12d 1477 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 1478 if (conn)
1479 ev->r.retcode = transport->start_conn(conn);
1480 else
1481 err = -EINVAL;
0896b752
AA		 1482 break;
1483 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 1484 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 1485 if (conn)
1486 transport->stop_conn(conn, ev->u.stop_conn.flag);
1487 else
1488 err = -EINVAL;
0896b752
AA		 1489 break;
1490 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 1491 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 1492 if (conn)
1493 ev->r.retcode = transport->send_pdu(conn,
1494 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1495 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1496 ev->u.send_pdu.data_size);
1497 else
1498 err = -EINVAL;
0896b752
AA		 1499 break;
1500 case ISCSI_UEVENT_GET_STATS:
5b940adf 1501 err = iscsi_if_get_stats(transport, nlh);
0896b752 1502 break;
264faaaa
OG		 1503 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1504 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1505 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1506 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1507 break;
01cb225d
MC		 1508 case ISCSI_UEVENT_TGT_DSCVR:
1509 err = iscsi_tgt_dscvr(transport, ev);
1510 break;
1d9bf13a
MC		 1511 case ISCSI_UEVENT_SET_HOST_PARAM:
1512 err = iscsi_set_host_param(transport, ev);
1513 break;
0896b752 1514 default:
1d9bf13a 1515 err = -ENOSYS;
0896b752
AA		 1516 break;
1517 }
1518
7b7232f3 1519 module_put(transport->owner);
0896b752
AA		 1520 return err;
1521}
1522
b5c7a12d 1523/*
cd40b7d3
DL		 1524 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1525 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 1526 */
0896b752 1527static void
cd40b7d3 1528iscsi_if_rx(struct sk_buff *skb)
0896b752 1529{
0b950672 1530 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 1531 while (skb->len >= NLMSG_SPACE(0)) {
1532 int err;
1533 uint32_t rlen;
1534 struct nlmsghdr *nlh;
1535 struct iscsi_uevent *ev;
1536
1537 nlh = nlmsg_hdr(skb);
1538 if (nlh->nlmsg_len < sizeof(*nlh) ||
1539 skb->len < nlh->nlmsg_len) {
1540 break;
ee7f8e40 1541 }
ee7f8e40 1542
cd40b7d3
DL		 1543 ev = NLMSG_DATA(nlh);
1544 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1545 if (rlen > skb->len)
1546 rlen = skb->len;
0896b752 1547
cd40b7d3
DL		 1548 err = iscsi_if_recv_msg(skb, nlh);
1549 if (err) {
1550 ev->type = ISCSI_KEVENT_IF_ERROR;
1551 ev->iferror = err;
0896b752 1552 }
cd40b7d3
DL		 1553 do {
1554 /*
1555 * special case for GET_STATS:
1556 * on success - sending reply and stats from
1557 * inside of if_recv_msg(),
1558 * on error - fall through.
1559 */
1560 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1561 break;
1562 err = iscsi_if_send_reply(
1563 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1564 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1565 } while (err < 0 && err != -ECONNREFUSED);
1566 skb_pull(skb, rlen);
0896b752 1567 }
0b950672 1568 mutex_unlock(&rx_queue_mutex);
0896b752 1569}
1da177e4 1570
fd7255f5 1571#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 1572struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 1573 __ATTR(_name,_mode,_show,_store)
1574
1da177e4 1575/*
0896b752 1576 * iSCSI connection attrs
1da177e4 1577 */
a54a52ca 1578#define iscsi_conn_attr_show(param) \
0896b752 1579static ssize_t \
ee959b00
TJ		 1580show_conn_param_##param(struct device *dev, \
1581 struct device_attribute *attr, char *buf) \
0896b752 1582{ \
ee959b00 1583 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 1584 struct iscsi_transport *t = conn->transport; \
a54a52ca 1585 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 1586}
1587
a54a52ca
MC		 1588#define iscsi_conn_attr(field, param) \
1589 iscsi_conn_attr_show(param) \
1590static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 1591 NULL);
0896b752 1592
a54a52ca
MC		 1593iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1594iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1595iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1596iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1597iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1598iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1599iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1600iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1601iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1602iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1603iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
f6d5180c
MC		 1604iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1605iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4
LT		 1606
1607/*
0896b752 1608 * iSCSI session attrs
1da177e4 1609 */
b2c64167 1610#define iscsi_session_attr_show(param, perm) \
fd7255f5 1611static ssize_t \
ee959b00
TJ		 1612show_session_param_##param(struct device *dev, \
1613 struct device_attribute *attr, char *buf) \
fd7255f5 1614{ \
ee959b00
TJ		 1615 struct iscsi_cls_session *session = \
1616 iscsi_dev_to_session(dev->parent); \
fd7255f5 1617 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 1618 \
1619 if (perm && !capable(CAP_SYS_ADMIN)) \
1620 return -EACCES; \
a54a52ca 1621 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 1622}
1623
b2c64167
MC		 1624#define iscsi_session_attr(field, param, perm) \
1625 iscsi_session_attr_show(param, perm) \
a54a52ca 1626static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5
MC		 1627 NULL);
1628
b2c64167
MC		 1629iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1630iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1631iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1632iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1633iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1634iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1635iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1636iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1637iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1638iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1639iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1640iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1641iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1642iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 1643iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1644iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1645iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
88dfd340
MC		 1646iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1647iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1da177e4 1648
6eabafbe 1649static ssize_t
ee959b00
TJ		 1650show_priv_session_state(struct device *dev, struct device_attribute *attr,
1651 char *buf)
6eabafbe 1652{
ee959b00 1653 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 1654 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1655}
1656static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1657 NULL);
1658
fd7255f5
MC		 1659#define iscsi_priv_session_attr_show(field, format) \
1660static ssize_t \
ee959b00
TJ		 1661show_priv_session_##field(struct device *dev, \
1662 struct device_attribute *attr, char *buf) \
fd7255f5 1663{ \
ee959b00
TJ		 1664 struct iscsi_cls_session *session = \
1665 iscsi_dev_to_session(dev->parent); \
fd7255f5
MC		 1666 return sprintf(buf, format"\n", session->field); \
1667}
1668
1669#define iscsi_priv_session_attr(field, format) \
1670 iscsi_priv_session_attr_show(field, format) \
1671static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1672 NULL)
30a6c652 1673iscsi_priv_session_attr(recovery_tmo, "%d");
fd7255f5 1674
1819dc81
MC		 1675/*
1676 * iSCSI host attrs
1677 */
1678#define iscsi_host_attr_show(param) \
1679static ssize_t \
ee959b00
TJ		 1680show_host_param_##param(struct device *dev, \
1681 struct device_attribute *attr, char *buf) \
1819dc81 1682{ \
ee959b00 1683 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 1684 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1685 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1686}
1687
1688#define iscsi_host_attr(field, param) \
1689 iscsi_host_attr_show(param) \
1690static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1691 NULL);
1692
d8196ed2 1693iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 1694iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 1695iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 1696iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 1697
fd7255f5
MC		 1698#define SETUP_PRIV_SESSION_RD_ATTR(field) \
1699do { \
ee959b00 1700 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
fd7255f5
MC		 1701 count++; \
1702} while (0)
1703
a54a52ca 1704
fd7255f5
MC		 1705#define SETUP_SESSION_RD_ATTR(field, param_flag) \
1706do { \
1707 if (tt->param_mask & param_flag) { \
ee959b00 1708 priv->session_attrs[count] = &dev_attr_sess_##field; \
1da177e4 1709 count++; \
fd7255f5
MC		 1710 } \
1711} while (0)
1712
fd7255f5
MC		 1713#define SETUP_CONN_RD_ATTR(field, param_flag) \
1714do { \
1715 if (tt->param_mask & param_flag) { \
ee959b00 1716 priv->conn_attrs[count] = &dev_attr_conn_##field; \
fd7255f5
MC		 1717 count++; \
1718 } \
1719} while (0)
1da177e4 1720
1819dc81
MC		 1721#define SETUP_HOST_RD_ATTR(field, param_flag) \
1722do { \
1723 if (tt->host_param_mask & param_flag) { \
ee959b00 1724 priv->host_attrs[count] = &dev_attr_host_##field; \
1819dc81
MC		 1725 count++; \
1726 } \
1727} while (0)
1728
0896b752
AA		 1729static int iscsi_session_match(struct attribute_container *cont,
1730 struct device *dev)
1da177e4 1731{
7b8631b5 1732 struct iscsi_cls_session *session;
1da177e4 1733 struct Scsi_Host *shost;
0896b752
AA		 1734 struct iscsi_internal *priv;
1735
1736 if (!iscsi_is_session_dev(dev))
1737 return 0;
1da177e4 1738
7b8631b5
MC		 1739 session = iscsi_dev_to_session(dev);
1740 shost = iscsi_session_to_shost(session);
0896b752 1741 if (!shost->transportt)
1da177e4
LT		 1742 return 0;
1743
0896b752
AA		 1744 priv = to_iscsi_internal(shost->transportt);
1745 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 1746 return 0;
1747
0896b752 1748 return &priv->session_cont.ac == cont;
1da177e4
LT		 1749}
1750
0896b752
AA		 1751static int iscsi_conn_match(struct attribute_container *cont,
1752 struct device *dev)
1753{
7b8631b5
MC		 1754 struct iscsi_cls_session *session;
1755 struct iscsi_cls_conn *conn;
1da177e4 1756 struct Scsi_Host *shost;
0896b752 1757 struct iscsi_internal *priv;
1da177e4 1758
0896b752 1759 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 1760 return 0;
1761
7b8631b5
MC		 1762 conn = iscsi_dev_to_conn(dev);
1763 session = iscsi_dev_to_session(conn->dev.parent);
1764 shost = iscsi_session_to_shost(session);
1765
0896b752 1766 if (!shost->transportt)
1da177e4
LT		 1767 return 0;
1768
0896b752
AA		 1769 priv = to_iscsi_internal(shost->transportt);
1770 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1771 return 0;
1da177e4 1772
0896b752
AA		 1773 return &priv->conn_cont.ac == cont;
1774}
1775
30a6c652
MC		 1776static int iscsi_host_match(struct attribute_container *cont,
1777 struct device *dev)
1778{
1779 struct Scsi_Host *shost;
1780 struct iscsi_internal *priv;
1781
1782 if (!scsi_is_host_device(dev))
1783 return 0;
1784
1785 shost = dev_to_shost(dev);
1786 if (!shost->transportt ||
1787 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1788 return 0;
1789
1790 priv = to_iscsi_internal(shost->transportt);
1791 return &priv->t.host_attrs.ac == cont;
1792}
1793
7b8631b5
MC		 1794struct scsi_transport_template *
1795iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 1796{
1797 struct iscsi_internal *priv;
1798 unsigned long flags;
1799 int count = 0, err;
1800
1801 BUG_ON(!tt);
1802
1803 priv = iscsi_if_transport_lookup(tt);
1804 if (priv)
7b8631b5 1805 return NULL;
0896b752 1806
24669f75 1807 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 1808 if (!priv)
7b8631b5 1809 return NULL;
0896b752 1810 INIT_LIST_HEAD(&priv->list);
53cb8a1f 1811 priv->daemon_pid = -1;
0896b752 1812 priv->iscsi_transport = tt;
30a6c652 1813 priv->t.user_scan = iscsi_user_scan;
a4804cd6
MC		 1814 if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
1815 priv->t.create_work_queue = 1;
0896b752 1816
ee959b00
TJ		 1817 priv->dev.class = &iscsi_transport_class;
1818 snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name);
1819 err = device_register(&priv->dev);
0896b752
AA		 1820 if (err)
1821 goto free_priv;
1822
ee959b00 1823 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 1824 if (err)
ee959b00 1825 goto unregister_dev;
0896b752 1826
30a6c652
MC		 1827 /* host parameters */
1828 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1829 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1830 priv->t.host_attrs.ac.match = iscsi_host_match;
32c6e1b9 1831 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 1832 transport_container_register(&priv->t.host_attrs);
1833
d8196ed2 1834 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
22236961 1835 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1819dc81 1836 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
8ad5781a 1837 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1819dc81
MC		 1838 BUG_ON(count > ISCSI_HOST_ATTRS);
1839 priv->host_attrs[count] = NULL;
1840 count = 0;
1841
0896b752
AA		 1842 /* connection parameters */
1843 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1844 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1845 priv->conn_cont.ac.match = iscsi_conn_match;
1846 transport_container_register(&priv->conn_cont);
1da177e4 1847
fd7255f5
MC		 1848 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1849 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1850 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1851 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1852 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1853 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1854 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1855 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
8d2860b3 1856 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
a54a52ca
MC		 1857 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1858 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
f6d5180c
MC		 1859 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1860 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
0896b752
AA		 1861
1862 BUG_ON(count > ISCSI_CONN_ATTRS);
1863 priv->conn_attrs[count] = NULL;
1da177e4 1864 count = 0;
1da177e4 1865
0896b752
AA		 1866 /* session parameters */
1867 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1868 priv->session_cont.ac.class = &iscsi_session_class.class;
1869 priv->session_cont.ac.match = iscsi_session_match;
1870 transport_container_register(&priv->session_cont);
1871
fd7255f5
MC		 1872 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1873 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1874 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1875 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1876 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1877 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1878 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1879 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
a54a52ca
MC		 1880 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1881 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
b2c64167
MC		 1882 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1883 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1884 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1885 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
843c0a8a 1886 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
4cd49ea1
MC		 1887 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1888 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
88dfd340
MC		 1889 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1890 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
30a6c652 1891 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
6eabafbe 1892 SETUP_PRIV_SESSION_RD_ATTR(state);
fd7255f5 1893
0896b752
AA		 1894 BUG_ON(count > ISCSI_SESSION_ATTRS);
1895 priv->session_attrs[count] = NULL;
1896
1897 spin_lock_irqsave(&iscsi_transport_lock, flags);
1898 list_add(&priv->list, &iscsi_transports);
1899 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1900
1901 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 1902 return &priv->t;
1da177e4 1903
ee959b00
TJ		 1904unregister_dev:
1905 device_unregister(&priv->dev);
d82ff9be 1906 return NULL;
0896b752
AA		 1907free_priv:
1908 kfree(priv);
7b8631b5 1909 return NULL;
1da177e4 1910}
0896b752
AA		 1911EXPORT_SYMBOL_GPL(iscsi_register_transport);
1912
1913int iscsi_unregister_transport(struct iscsi_transport *tt)
1914{
1915 struct iscsi_internal *priv;
1916 unsigned long flags;
1917
1918 BUG_ON(!tt);
1919
0b950672 1920 mutex_lock(&rx_queue_mutex);
0896b752
AA		 1921
1922 priv = iscsi_if_transport_lookup(tt);
1923 BUG_ON (!priv);
1924
0896b752
AA		 1925 spin_lock_irqsave(&iscsi_transport_lock, flags);
1926 list_del(&priv->list);
1927 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1928
1929 transport_container_unregister(&priv->conn_cont);
1930 transport_container_unregister(&priv->session_cont);
30a6c652 1931 transport_container_unregister(&priv->t.host_attrs);
0896b752 1932
ee959b00
TJ		 1933 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1934 device_unregister(&priv->dev);
0b950672 1935 mutex_unlock(&rx_queue_mutex);
1da177e4 1936
0896b752
AA		 1937 return 0;
1938}
1939EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 1940
1da177e4
LT		 1941static __init int iscsi_transport_init(void)
1942{
0896b752 1943 int err;
1da177e4 1944
09492605 1945 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 1946 ISCSI_TRANSPORT_VERSION);
1947
41be1444
MC		 1948 atomic_set(&iscsi_session_nr, 0);
1949
0896b752 1950 err = class_register(&iscsi_transport_class);
1da177e4
LT		 1951 if (err)
1952 return err;
0896b752 1953
d82ff9be 1954 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 1955 if (err)
1956 goto unregister_transport_class;
1957
d82ff9be
MC		 1958 err = transport_class_register(&iscsi_host_class);
1959 if (err)
1960 goto unregister_endpoint_class;
1961
30a6c652
MC		 1962 err = transport_class_register(&iscsi_connection_class);
1963 if (err)
1964 goto unregister_host_class;
1965
0896b752
AA		 1966 err = transport_class_register(&iscsi_session_class);
1967 if (err)
1968 goto unregister_conn_class;
1969
d82ff9be
MC		 1970 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1971 NULL, THIS_MODULE);
0896b752
AA		 1972 if (!nls) {
1973 err = -ENOBUFS;
43a145a3 1974 goto unregister_session_class;
0896b752
AA		 1975 }
1976
d8bf541e
MC		 1977 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1978 if (!iscsi_eh_timer_workq)
1979 goto release_nls;
1980
43a145a3 1981 return 0;
0896b752 1982
d8bf541e 1983release_nls:
b7c6ba6e 1984 netlink_kernel_release(nls);
0896b752
AA		 1985unregister_session_class:
1986 transport_class_unregister(&iscsi_session_class);
1987unregister_conn_class:
1988 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 1989unregister_host_class:
1990 transport_class_unregister(&iscsi_host_class);
d82ff9be
MC		 1991unregister_endpoint_class:
1992 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 1993unregister_transport_class:
1994 class_unregister(&iscsi_transport_class);
1995 return err;
1da177e4
LT		 1996}
1997
1998static void __exit iscsi_transport_exit(void)
1999{
d8bf541e 2000 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2001 netlink_kernel_release(nls);
0896b752
AA		 2002 transport_class_unregister(&iscsi_connection_class);
2003 transport_class_unregister(&iscsi_session_class);
30a6c652 2004 transport_class_unregister(&iscsi_host_class);
d82ff9be 2005 class_unregister(&iscsi_endpoint_class);
0896b752 2006 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2007}
2008
2009module_init(iscsi_transport_init);
2010module_exit(iscsi_transport_exit);
2011
0896b752
AA		 2012MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2013 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2014 "Alex Aizman <itn780@yahoo.com>");
2015MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2016MODULE_LICENSE("GPL");
f4246b33 2017MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
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