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1 | /* |
2 | * iSCSI transport class definitions |
3 | * |
4 | * Copyright (C) IBM Corporation, 2004 |
5 | * Copyright (C) Mike Christie, 2004 - 2005 |
6 | * Copyright (C) Dmitry Yusupov, 2004 - 2005 |
7 | * Copyright (C) Alex Aizman, 2004 - 2005 |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2 of the License, or |
12 | * (at your option) any later version. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
22 | */ |
23 | #include <linux/module.h> |
24 | #include <linux/mutex.h> |
25 | #include <linux/slab.h> |
26 | #include <net/tcp.h> |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_host.h> |
29 | #include <scsi/scsi_device.h> |
30 | #include <scsi/scsi_transport.h> |
31 | #include <scsi/scsi_transport_iscsi.h> |
32 | #include <scsi/iscsi_if.h> |
33 | |
34 | #define ISCSI_SESSION_ATTRS 22 |
35 | #define ISCSI_CONN_ATTRS 13 |
36 | #define ISCSI_HOST_ATTRS 4 |
37 | |
38 | #define ISCSI_TRANSPORT_VERSION "2.0-870" |
39 | |
40 | static int dbg_session; |
41 | module_param_named(debug_session, dbg_session, int, |
42 | S_IRUGO | S_IWUSR); |
43 | MODULE_PARM_DESC(debug_session, |
44 | "Turn on debugging for sessions in scsi_transport_iscsi " |
45 | "module. Set to 1 to turn on, and zero to turn off. Default " |
46 | "is off."); |
47 | |
48 | static int dbg_conn; |
49 | module_param_named(debug_conn, dbg_conn, int, |
50 | S_IRUGO | S_IWUSR); |
51 | MODULE_PARM_DESC(debug_conn, |
52 | "Turn on debugging for connections in scsi_transport_iscsi " |
53 | "module. Set to 1 to turn on, and zero to turn off. Default " |
54 | "is off."); |
55 | |
56 | #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \ |
57 | do { \ |
58 | if (dbg_session) \ |
59 | iscsi_cls_session_printk(KERN_INFO, _session, \ |
60 | "%s: " dbg_fmt, \ |
61 | __func__, ##arg); \ |
62 | } while (0); |
63 | |
64 | #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \ |
65 | do { \ |
66 | if (dbg_conn) \ |
67 | iscsi_cls_conn_printk(KERN_INFO, _conn, \ |
68 | "%s: " dbg_fmt, \ |
69 | __func__, ##arg); \ |
70 | } while (0); |
71 | |
72 | struct iscsi_internal { |
73 | struct scsi_transport_template t; |
74 | struct iscsi_transport *iscsi_transport; |
75 | struct list_head list; |
76 | struct device dev; |
77 | |
78 | struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; |
79 | struct transport_container conn_cont; |
80 | struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; |
81 | struct transport_container session_cont; |
82 | struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
83 | }; |
84 | |
85 | static atomic_t iscsi_session_nr; /* sysfs session id for next new session */ |
86 | static struct workqueue_struct *iscsi_eh_timer_workq; |
87 | |
88 | /* |
89 | * list of registered transports and lock that must |
90 | * be held while accessing list. The iscsi_transport_lock must |
91 | * be acquired after the rx_queue_mutex. |
92 | */ |
93 | static LIST_HEAD(iscsi_transports); |
94 | static DEFINE_SPINLOCK(iscsi_transport_lock); |
95 | |
96 | #define to_iscsi_internal(tmpl) \ |
97 | container_of(tmpl, struct iscsi_internal, t) |
98 | |
99 | #define dev_to_iscsi_internal(_dev) \ |
100 | container_of(_dev, struct iscsi_internal, dev) |
101 | |
102 | static void iscsi_transport_release(struct device *dev) |
103 | { |
104 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); |
105 | kfree(priv); |
106 | } |
107 | |
108 | /* |
109 | * iscsi_transport_class represents the iscsi_transports that are |
110 | * registered. |
111 | */ |
112 | static struct class iscsi_transport_class = { |
113 | .name = "iscsi_transport", |
114 | .dev_release = iscsi_transport_release, |
115 | }; |
116 | |
117 | static ssize_t |
118 | show_transport_handle(struct device *dev, struct device_attribute *attr, |
119 | char *buf) |
120 | { |
121 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); |
122 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
123 | } |
124 | static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); |
125 | |
126 | #define show_transport_attr(name, format) \ |
127 | static ssize_t \ |
128 | show_transport_##name(struct device *dev, \ |
129 | struct device_attribute *attr,char *buf) \ |
130 | { \ |
131 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \ |
132 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ |
133 | } \ |
134 | static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); |
135 | |
136 | show_transport_attr(caps, "0x%x"); |
137 | |
138 | static struct attribute *iscsi_transport_attrs[] = { |
139 | &dev_attr_handle.attr, |
140 | &dev_attr_caps.attr, |
141 | NULL, |
142 | }; |
143 | |
144 | static struct attribute_group iscsi_transport_group = { |
145 | .attrs = iscsi_transport_attrs, |
146 | }; |
147 | |
148 | /* |
149 | * iSCSI endpoint attrs |
150 | */ |
151 | #define iscsi_dev_to_endpoint(_dev) \ |
152 | container_of(_dev, struct iscsi_endpoint, dev) |
153 | |
154 | #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \ |
155 | struct device_attribute dev_attr_##_prefix##_##_name = \ |
156 | __ATTR(_name,_mode,_show,_store) |
157 | |
158 | static void iscsi_endpoint_release(struct device *dev) |
159 | { |
160 | struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); |
161 | kfree(ep); |
162 | } |
163 | |
164 | static struct class iscsi_endpoint_class = { |
165 | .name = "iscsi_endpoint", |
166 | .dev_release = iscsi_endpoint_release, |
167 | }; |
168 | |
169 | static ssize_t |
170 | show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf) |
171 | { |
172 | struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); |
173 | return sprintf(buf, "%llu\n", (unsigned long long) ep->id); |
174 | } |
175 | static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL); |
176 | |
177 | static struct attribute *iscsi_endpoint_attrs[] = { |
178 | &dev_attr_ep_handle.attr, |
179 | NULL, |
180 | }; |
181 | |
182 | static struct attribute_group iscsi_endpoint_group = { |
183 | .attrs = iscsi_endpoint_attrs, |
184 | }; |
185 | |
186 | #define ISCSI_MAX_EPID -1 |
187 | |
188 | static int iscsi_match_epid(struct device *dev, void *data) |
189 | { |
190 | struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); |
191 | uint64_t *epid = (uint64_t *) data; |
192 | |
193 | return *epid == ep->id; |
194 | } |
195 | |
196 | struct iscsi_endpoint * |
197 | iscsi_create_endpoint(int dd_size) |
198 | { |
199 | struct device *dev; |
200 | struct iscsi_endpoint *ep; |
201 | uint64_t id; |
202 | int err; |
203 | |
204 | for (id = 1; id < ISCSI_MAX_EPID; id++) { |
205 | dev = class_find_device(&iscsi_endpoint_class, NULL, &id, |
206 | iscsi_match_epid); |
207 | if (!dev) |
208 | break; |
209 | } |
210 | if (id == ISCSI_MAX_EPID) { |
211 | printk(KERN_ERR "Too many connections. Max supported %u\n", |
212 | ISCSI_MAX_EPID - 1); |
213 | return NULL; |
214 | } |
215 | |
216 | ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL); |
217 | if (!ep) |
218 | return NULL; |
219 | |
220 | ep->id = id; |
221 | ep->dev.class = &iscsi_endpoint_class; |
222 | dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id); |
223 | err = device_register(&ep->dev); |
224 | if (err) |
225 | goto free_ep; |
226 | |
227 | err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group); |
228 | if (err) |
229 | goto unregister_dev; |
230 | |
231 | if (dd_size) |
232 | ep->dd_data = &ep[1]; |
233 | return ep; |
234 | |
235 | unregister_dev: |
236 | device_unregister(&ep->dev); |
237 | return NULL; |
238 | |
239 | free_ep: |
240 | kfree(ep); |
241 | return NULL; |
242 | } |
243 | EXPORT_SYMBOL_GPL(iscsi_create_endpoint); |
244 | |
245 | void iscsi_destroy_endpoint(struct iscsi_endpoint *ep) |
246 | { |
247 | sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group); |
248 | device_unregister(&ep->dev); |
249 | } |
250 | EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint); |
251 | |
252 | struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle) |
253 | { |
254 | struct iscsi_endpoint *ep; |
255 | struct device *dev; |
256 | |
257 | dev = class_find_device(&iscsi_endpoint_class, NULL, &handle, |
258 | iscsi_match_epid); |
259 | if (!dev) |
260 | return NULL; |
261 | |
262 | ep = iscsi_dev_to_endpoint(dev); |
263 | /* |
264 | * we can drop this now because the interface will prevent |
265 | * removals and lookups from racing. |
266 | */ |
267 | put_device(dev); |
268 | return ep; |
269 | } |
270 | EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint); |
271 | |
272 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
273 | struct device *cdev) |
274 | { |
275 | struct Scsi_Host *shost = dev_to_shost(dev); |
276 | struct iscsi_cls_host *ihost = shost->shost_data; |
277 | |
278 | memset(ihost, 0, sizeof(*ihost)); |
279 | atomic_set(&ihost->nr_scans, 0); |
280 | mutex_init(&ihost->mutex); |
281 | return 0; |
282 | } |
283 | |
284 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, |
285 | "iscsi_host", |
286 | iscsi_setup_host, |
287 | NULL, |
288 | NULL); |
289 | |
290 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
291 | "iscsi_session", |
292 | NULL, |
293 | NULL, |
294 | NULL); |
295 | |
296 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
297 | "iscsi_connection", |
298 | NULL, |
299 | NULL, |
300 | NULL); |
301 | |
302 | static struct sock *nls; |
303 | static DEFINE_MUTEX(rx_queue_mutex); |
304 | |
305 | static LIST_HEAD(sesslist); |
306 | static DEFINE_SPINLOCK(sesslock); |
307 | static LIST_HEAD(connlist); |
308 | static DEFINE_SPINLOCK(connlock); |
309 | |
310 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
311 | { |
312 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); |
313 | return sess->sid; |
314 | } |
315 | |
316 | /* |
317 | * Returns the matching session to a given sid |
318 | */ |
319 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) |
320 | { |
321 | unsigned long flags; |
322 | struct iscsi_cls_session *sess; |
323 | |
324 | spin_lock_irqsave(&sesslock, flags); |
325 | list_for_each_entry(sess, &sesslist, sess_list) { |
326 | if (sess->sid == sid) { |
327 | spin_unlock_irqrestore(&sesslock, flags); |
328 | return sess; |
329 | } |
330 | } |
331 | spin_unlock_irqrestore(&sesslock, flags); |
332 | return NULL; |
333 | } |
334 | |
335 | /* |
336 | * Returns the matching connection to a given sid / cid tuple |
337 | */ |
338 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) |
339 | { |
340 | unsigned long flags; |
341 | struct iscsi_cls_conn *conn; |
342 | |
343 | spin_lock_irqsave(&connlock, flags); |
344 | list_for_each_entry(conn, &connlist, conn_list) { |
345 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
346 | spin_unlock_irqrestore(&connlock, flags); |
347 | return conn; |
348 | } |
349 | } |
350 | spin_unlock_irqrestore(&connlock, flags); |
351 | return NULL; |
352 | } |
353 | |
354 | /* |
355 | * The following functions can be used by LLDs that allocate |
356 | * their own scsi_hosts or by software iscsi LLDs |
357 | */ |
358 | static struct { |
359 | int value; |
360 | char *name; |
361 | } iscsi_session_state_names[] = { |
362 | { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" }, |
363 | { ISCSI_SESSION_FAILED, "FAILED" }, |
364 | { ISCSI_SESSION_FREE, "FREE" }, |
365 | }; |
366 | |
367 | static const char *iscsi_session_state_name(int state) |
368 | { |
369 | int i; |
370 | char *name = NULL; |
371 | |
372 | for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { |
373 | if (iscsi_session_state_names[i].value == state) { |
374 | name = iscsi_session_state_names[i].name; |
375 | break; |
376 | } |
377 | } |
378 | return name; |
379 | } |
380 | |
381 | int iscsi_session_chkready(struct iscsi_cls_session *session) |
382 | { |
383 | unsigned long flags; |
384 | int err; |
385 | |
386 | spin_lock_irqsave(&session->lock, flags); |
387 | switch (session->state) { |
388 | case ISCSI_SESSION_LOGGED_IN: |
389 | err = 0; |
390 | break; |
391 | case ISCSI_SESSION_FAILED: |
392 | err = DID_IMM_RETRY << 16; |
393 | break; |
394 | case ISCSI_SESSION_FREE: |
395 | err = DID_TRANSPORT_FAILFAST << 16; |
396 | break; |
397 | default: |
398 | err = DID_NO_CONNECT << 16; |
399 | break; |
400 | } |
401 | spin_unlock_irqrestore(&session->lock, flags); |
402 | return err; |
403 | } |
404 | EXPORT_SYMBOL_GPL(iscsi_session_chkready); |
405 | |
406 | static void iscsi_session_release(struct device *dev) |
407 | { |
408 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); |
409 | struct Scsi_Host *shost; |
410 | |
411 | shost = iscsi_session_to_shost(session); |
412 | scsi_host_put(shost); |
413 | ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n"); |
414 | kfree(session); |
415 | } |
416 | |
417 | static int iscsi_is_session_dev(const struct device *dev) |
418 | { |
419 | return dev->release == iscsi_session_release; |
420 | } |
421 | |
422 | static int iscsi_iter_session_fn(struct device *dev, void *data) |
423 | { |
424 | void (* fn) (struct iscsi_cls_session *) = data; |
425 | |
426 | if (!iscsi_is_session_dev(dev)) |
427 | return 0; |
428 | fn(iscsi_dev_to_session(dev)); |
429 | return 0; |
430 | } |
431 | |
432 | void iscsi_host_for_each_session(struct Scsi_Host *shost, |
433 | void (*fn)(struct iscsi_cls_session *)) |
434 | { |
435 | device_for_each_child(&shost->shost_gendev, fn, |
436 | iscsi_iter_session_fn); |
437 | } |
438 | EXPORT_SYMBOL_GPL(iscsi_host_for_each_session); |
439 | |
440 | /** |
441 | * iscsi_scan_finished - helper to report when running scans are done |
442 | * @shost: scsi host |
443 | * @time: scan run time |
444 | * |
445 | * This function can be used by drives like qla4xxx to report to the scsi |
446 | * layer when the scans it kicked off at module load time are done. |
447 | */ |
448 | int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time) |
449 | { |
450 | struct iscsi_cls_host *ihost = shost->shost_data; |
451 | /* |
452 | * qla4xxx will have kicked off some session unblocks before calling |
453 | * scsi_scan_host, so just wait for them to complete. |
454 | */ |
455 | return !atomic_read(&ihost->nr_scans); |
456 | } |
457 | EXPORT_SYMBOL_GPL(iscsi_scan_finished); |
458 | |
459 | struct iscsi_scan_data { |
460 | unsigned int channel; |
461 | unsigned int id; |
462 | unsigned int lun; |
463 | }; |
464 | |
465 | static int iscsi_user_scan_session(struct device *dev, void *data) |
466 | { |
467 | struct iscsi_scan_data *scan_data = data; |
468 | struct iscsi_cls_session *session; |
469 | struct Scsi_Host *shost; |
470 | struct iscsi_cls_host *ihost; |
471 | unsigned long flags; |
472 | unsigned int id; |
473 | |
474 | if (!iscsi_is_session_dev(dev)) |
475 | return 0; |
476 | |
477 | session = iscsi_dev_to_session(dev); |
478 | |
479 | ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n"); |
480 | |
481 | shost = iscsi_session_to_shost(session); |
482 | ihost = shost->shost_data; |
483 | |
484 | mutex_lock(&ihost->mutex); |
485 | spin_lock_irqsave(&session->lock, flags); |
486 | if (session->state != ISCSI_SESSION_LOGGED_IN) { |
487 | spin_unlock_irqrestore(&session->lock, flags); |
488 | goto user_scan_exit; |
489 | } |
490 | id = session->target_id; |
491 | spin_unlock_irqrestore(&session->lock, flags); |
492 | |
493 | if (id != ISCSI_MAX_TARGET) { |
494 | if ((scan_data->channel == SCAN_WILD_CARD || |
495 | scan_data->channel == 0) && |
496 | (scan_data->id == SCAN_WILD_CARD || |
497 | scan_data->id == id)) |
498 | scsi_scan_target(&session->dev, 0, id, |
499 | scan_data->lun, 1); |
500 | } |
501 | |
502 | user_scan_exit: |
503 | mutex_unlock(&ihost->mutex); |
504 | ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n"); |
505 | return 0; |
506 | } |
507 | |
508 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
509 | uint id, uint lun) |
510 | { |
511 | struct iscsi_scan_data scan_data; |
512 | |
513 | scan_data.channel = channel; |
514 | scan_data.id = id; |
515 | scan_data.lun = lun; |
516 | |
517 | return device_for_each_child(&shost->shost_gendev, &scan_data, |
518 | iscsi_user_scan_session); |
519 | } |
520 | |
521 | static void iscsi_scan_session(struct work_struct *work) |
522 | { |
523 | struct iscsi_cls_session *session = |
524 | container_of(work, struct iscsi_cls_session, scan_work); |
525 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
526 | struct iscsi_cls_host *ihost = shost->shost_data; |
527 | struct iscsi_scan_data scan_data; |
528 | |
529 | scan_data.channel = 0; |
530 | scan_data.id = SCAN_WILD_CARD; |
531 | scan_data.lun = SCAN_WILD_CARD; |
532 | |
533 | iscsi_user_scan_session(&session->dev, &scan_data); |
534 | atomic_dec(&ihost->nr_scans); |
535 | } |
536 | |
537 | static void session_recovery_timedout(struct work_struct *work) |
538 | { |
539 | struct iscsi_cls_session *session = |
540 | container_of(work, struct iscsi_cls_session, |
541 | recovery_work.work); |
542 | unsigned long flags; |
543 | |
544 | iscsi_cls_session_printk(KERN_INFO, session, |
545 | "session recovery timed out after %d secs\n", |
546 | session->recovery_tmo); |
547 | |
548 | spin_lock_irqsave(&session->lock, flags); |
549 | switch (session->state) { |
550 | case ISCSI_SESSION_FAILED: |
551 | session->state = ISCSI_SESSION_FREE; |
552 | break; |
553 | case ISCSI_SESSION_LOGGED_IN: |
554 | case ISCSI_SESSION_FREE: |
555 | /* we raced with the unblock's flush */ |
556 | spin_unlock_irqrestore(&session->lock, flags); |
557 | return; |
558 | } |
559 | spin_unlock_irqrestore(&session->lock, flags); |
560 | |
561 | if (session->transport->session_recovery_timedout) |
562 | session->transport->session_recovery_timedout(session); |
563 | |
564 | ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n"); |
565 | scsi_target_unblock(&session->dev); |
566 | ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n"); |
567 | } |
568 | |
569 | static void __iscsi_unblock_session(struct work_struct *work) |
570 | { |
571 | struct iscsi_cls_session *session = |
572 | container_of(work, struct iscsi_cls_session, |
573 | unblock_work); |
574 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
575 | struct iscsi_cls_host *ihost = shost->shost_data; |
576 | unsigned long flags; |
577 | |
578 | ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n"); |
579 | /* |
580 | * The recovery and unblock work get run from the same workqueue, |
581 | * so try to cancel it if it was going to run after this unblock. |
582 | */ |
583 | cancel_delayed_work(&session->recovery_work); |
584 | spin_lock_irqsave(&session->lock, flags); |
585 | session->state = ISCSI_SESSION_LOGGED_IN; |
586 | spin_unlock_irqrestore(&session->lock, flags); |
587 | /* start IO */ |
588 | scsi_target_unblock(&session->dev); |
589 | /* |
590 | * Only do kernel scanning if the driver is properly hooked into |
591 | * the async scanning code (drivers like iscsi_tcp do login and |
592 | * scanning from userspace). |
593 | */ |
594 | if (shost->hostt->scan_finished) { |
595 | if (scsi_queue_work(shost, &session->scan_work)) |
596 | atomic_inc(&ihost->nr_scans); |
597 | } |
598 | ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n"); |
599 | } |
600 | |
601 | /** |
602 | * iscsi_unblock_session - set a session as logged in and start IO. |
603 | * @session: iscsi session |
604 | * |
605 | * Mark a session as ready to accept IO. |
606 | */ |
607 | void iscsi_unblock_session(struct iscsi_cls_session *session) |
608 | { |
609 | queue_work(iscsi_eh_timer_workq, &session->unblock_work); |
610 | /* |
611 | * make sure all the events have completed before tell the driver |
612 | * it is safe |
613 | */ |
614 | flush_workqueue(iscsi_eh_timer_workq); |
615 | } |
616 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
617 | |
618 | static void __iscsi_block_session(struct work_struct *work) |
619 | { |
620 | struct iscsi_cls_session *session = |
621 | container_of(work, struct iscsi_cls_session, |
622 | block_work); |
623 | unsigned long flags; |
624 | |
625 | ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n"); |
626 | spin_lock_irqsave(&session->lock, flags); |
627 | session->state = ISCSI_SESSION_FAILED; |
628 | spin_unlock_irqrestore(&session->lock, flags); |
629 | scsi_target_block(&session->dev); |
630 | ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n"); |
631 | if (session->recovery_tmo >= 0) |
632 | queue_delayed_work(iscsi_eh_timer_workq, |
633 | &session->recovery_work, |
634 | session->recovery_tmo * HZ); |
635 | } |
636 | |
637 | void iscsi_block_session(struct iscsi_cls_session *session) |
638 | { |
639 | queue_work(iscsi_eh_timer_workq, &session->block_work); |
640 | } |
641 | EXPORT_SYMBOL_GPL(iscsi_block_session); |
642 | |
643 | static void __iscsi_unbind_session(struct work_struct *work) |
644 | { |
645 | struct iscsi_cls_session *session = |
646 | container_of(work, struct iscsi_cls_session, |
647 | unbind_work); |
648 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
649 | struct iscsi_cls_host *ihost = shost->shost_data; |
650 | unsigned long flags; |
651 | |
652 | ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n"); |
653 | |
654 | /* Prevent new scans and make sure scanning is not in progress */ |
655 | mutex_lock(&ihost->mutex); |
656 | spin_lock_irqsave(&session->lock, flags); |
657 | if (session->target_id == ISCSI_MAX_TARGET) { |
658 | spin_unlock_irqrestore(&session->lock, flags); |
659 | mutex_unlock(&ihost->mutex); |
660 | return; |
661 | } |
662 | session->target_id = ISCSI_MAX_TARGET; |
663 | spin_unlock_irqrestore(&session->lock, flags); |
664 | mutex_unlock(&ihost->mutex); |
665 | |
666 | scsi_remove_target(&session->dev); |
667 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); |
668 | ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n"); |
669 | } |
670 | |
671 | struct iscsi_cls_session * |
672 | iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport, |
673 | int dd_size) |
674 | { |
675 | struct iscsi_cls_session *session; |
676 | |
677 | session = kzalloc(sizeof(*session) + dd_size, |
678 | GFP_KERNEL); |
679 | if (!session) |
680 | return NULL; |
681 | |
682 | session->transport = transport; |
683 | session->recovery_tmo = 120; |
684 | session->state = ISCSI_SESSION_FREE; |
685 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
686 | INIT_LIST_HEAD(&session->sess_list); |
687 | INIT_WORK(&session->unblock_work, __iscsi_unblock_session); |
688 | INIT_WORK(&session->block_work, __iscsi_block_session); |
689 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
690 | INIT_WORK(&session->scan_work, iscsi_scan_session); |
691 | spin_lock_init(&session->lock); |
692 | |
693 | /* this is released in the dev's release function */ |
694 | scsi_host_get(shost); |
695 | session->dev.parent = &shost->shost_gendev; |
696 | session->dev.release = iscsi_session_release; |
697 | device_initialize(&session->dev); |
698 | if (dd_size) |
699 | session->dd_data = &session[1]; |
700 | |
701 | ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n"); |
702 | return session; |
703 | } |
704 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); |
705 | |
706 | static int iscsi_get_next_target_id(struct device *dev, void *data) |
707 | { |
708 | struct iscsi_cls_session *session; |
709 | unsigned long flags; |
710 | int err = 0; |
711 | |
712 | if (!iscsi_is_session_dev(dev)) |
713 | return 0; |
714 | |
715 | session = iscsi_dev_to_session(dev); |
716 | spin_lock_irqsave(&session->lock, flags); |
717 | if (*((unsigned int *) data) == session->target_id) |
718 | err = -EEXIST; |
719 | spin_unlock_irqrestore(&session->lock, flags); |
720 | return err; |
721 | } |
722 | |
723 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
724 | { |
725 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
726 | struct iscsi_cls_host *ihost; |
727 | unsigned long flags; |
728 | unsigned int id = target_id; |
729 | int err; |
730 | |
731 | ihost = shost->shost_data; |
732 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
733 | |
734 | if (id == ISCSI_MAX_TARGET) { |
735 | for (id = 0; id < ISCSI_MAX_TARGET; id++) { |
736 | err = device_for_each_child(&shost->shost_gendev, &id, |
737 | iscsi_get_next_target_id); |
738 | if (!err) |
739 | break; |
740 | } |
741 | |
742 | if (id == ISCSI_MAX_TARGET) { |
743 | iscsi_cls_session_printk(KERN_ERR, session, |
744 | "Too many iscsi targets. Max " |
745 | "number of targets is %d.\n", |
746 | ISCSI_MAX_TARGET - 1); |
747 | err = -EOVERFLOW; |
748 | goto release_host; |
749 | } |
750 | } |
751 | session->target_id = id; |
752 | |
753 | dev_set_name(&session->dev, "session%u", session->sid); |
754 | err = device_add(&session->dev); |
755 | if (err) { |
756 | iscsi_cls_session_printk(KERN_ERR, session, |
757 | "could not register session's dev\n"); |
758 | goto release_host; |
759 | } |
760 | transport_register_device(&session->dev); |
761 | |
762 | spin_lock_irqsave(&sesslock, flags); |
763 | list_add(&session->sess_list, &sesslist); |
764 | spin_unlock_irqrestore(&sesslock, flags); |
765 | |
766 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); |
767 | ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n"); |
768 | return 0; |
769 | |
770 | release_host: |
771 | scsi_host_put(shost); |
772 | return err; |
773 | } |
774 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
775 | |
776 | /** |
777 | * iscsi_create_session - create iscsi class session |
778 | * @shost: scsi host |
779 | * @transport: iscsi transport |
780 | * @dd_size: private driver data size |
781 | * @target_id: which target |
782 | * |
783 | * This can be called from a LLD or iscsi_transport. |
784 | */ |
785 | struct iscsi_cls_session * |
786 | iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport, |
787 | int dd_size, unsigned int target_id) |
788 | { |
789 | struct iscsi_cls_session *session; |
790 | |
791 | session = iscsi_alloc_session(shost, transport, dd_size); |
792 | if (!session) |
793 | return NULL; |
794 | |
795 | if (iscsi_add_session(session, target_id)) { |
796 | iscsi_free_session(session); |
797 | return NULL; |
798 | } |
799 | return session; |
800 | } |
801 | EXPORT_SYMBOL_GPL(iscsi_create_session); |
802 | |
803 | static void iscsi_conn_release(struct device *dev) |
804 | { |
805 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); |
806 | struct device *parent = conn->dev.parent; |
807 | |
808 | ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n"); |
809 | kfree(conn); |
810 | put_device(parent); |
811 | } |
812 | |
813 | static int iscsi_is_conn_dev(const struct device *dev) |
814 | { |
815 | return dev->release == iscsi_conn_release; |
816 | } |
817 | |
818 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) |
819 | { |
820 | if (!iscsi_is_conn_dev(dev)) |
821 | return 0; |
822 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); |
823 | } |
824 | |
825 | void iscsi_remove_session(struct iscsi_cls_session *session) |
826 | { |
827 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
828 | unsigned long flags; |
829 | int err; |
830 | |
831 | ISCSI_DBG_TRANS_SESSION(session, "Removing session\n"); |
832 | |
833 | spin_lock_irqsave(&sesslock, flags); |
834 | list_del(&session->sess_list); |
835 | spin_unlock_irqrestore(&sesslock, flags); |
836 | |
837 | /* make sure there are no blocks/unblocks queued */ |
838 | flush_workqueue(iscsi_eh_timer_workq); |
839 | /* make sure the timedout callout is not running */ |
840 | if (!cancel_delayed_work(&session->recovery_work)) |
841 | flush_workqueue(iscsi_eh_timer_workq); |
842 | /* |
843 | * If we are blocked let commands flow again. The lld or iscsi |
844 | * layer should set up the queuecommand to fail commands. |
845 | * We assume that LLD will not be calling block/unblock while |
846 | * removing the session. |
847 | */ |
848 | spin_lock_irqsave(&session->lock, flags); |
849 | session->state = ISCSI_SESSION_FREE; |
850 | spin_unlock_irqrestore(&session->lock, flags); |
851 | |
852 | scsi_target_unblock(&session->dev); |
853 | /* flush running scans then delete devices */ |
854 | scsi_flush_work(shost); |
855 | __iscsi_unbind_session(&session->unbind_work); |
856 | |
857 | /* hw iscsi may not have removed all connections from session */ |
858 | err = device_for_each_child(&session->dev, NULL, |
859 | iscsi_iter_destroy_conn_fn); |
860 | if (err) |
861 | iscsi_cls_session_printk(KERN_ERR, session, |
862 | "Could not delete all connections " |
863 | "for session. Error %d.\n", err); |
864 | |
865 | transport_unregister_device(&session->dev); |
866 | |
867 | ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n"); |
868 | device_del(&session->dev); |
869 | } |
870 | EXPORT_SYMBOL_GPL(iscsi_remove_session); |
871 | |
872 | void iscsi_free_session(struct iscsi_cls_session *session) |
873 | { |
874 | ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n"); |
875 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
876 | put_device(&session->dev); |
877 | } |
878 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
879 | |
880 | /** |
881 | * iscsi_destroy_session - destroy iscsi session |
882 | * @session: iscsi_session |
883 | * |
884 | * Can be called by a LLD or iscsi_transport. There must not be |
885 | * any running connections. |
886 | */ |
887 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
888 | { |
889 | iscsi_remove_session(session); |
890 | ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n"); |
891 | iscsi_free_session(session); |
892 | return 0; |
893 | } |
894 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
895 | |
896 | /** |
897 | * iscsi_create_conn - create iscsi class connection |
898 | * @session: iscsi cls session |
899 | * @dd_size: private driver data size |
900 | * @cid: connection id |
901 | * |
902 | * This can be called from a LLD or iscsi_transport. The connection |
903 | * is child of the session so cid must be unique for all connections |
904 | * on the session. |
905 | * |
906 | * Since we do not support MCS, cid will normally be zero. In some cases |
907 | * for software iscsi we could be trying to preallocate a connection struct |
908 | * in which case there could be two connection structs and cid would be |
909 | * non-zero. |
910 | */ |
911 | struct iscsi_cls_conn * |
912 | iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid) |
913 | { |
914 | struct iscsi_transport *transport = session->transport; |
915 | struct iscsi_cls_conn *conn; |
916 | unsigned long flags; |
917 | int err; |
918 | |
919 | conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL); |
920 | if (!conn) |
921 | return NULL; |
922 | if (dd_size) |
923 | conn->dd_data = &conn[1]; |
924 | |
925 | INIT_LIST_HEAD(&conn->conn_list); |
926 | conn->transport = transport; |
927 | conn->cid = cid; |
928 | |
929 | /* this is released in the dev's release function */ |
930 | if (!get_device(&session->dev)) |
931 | goto free_conn; |
932 | |
933 | dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid); |
934 | conn->dev.parent = &session->dev; |
935 | conn->dev.release = iscsi_conn_release; |
936 | err = device_register(&conn->dev); |
937 | if (err) { |
938 | iscsi_cls_session_printk(KERN_ERR, session, "could not " |
939 | "register connection's dev\n"); |
940 | goto release_parent_ref; |
941 | } |
942 | transport_register_device(&conn->dev); |
943 | |
944 | spin_lock_irqsave(&connlock, flags); |
945 | list_add(&conn->conn_list, &connlist); |
946 | conn->active = 1; |
947 | spin_unlock_irqrestore(&connlock, flags); |
948 | |
949 | ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n"); |
950 | return conn; |
951 | |
952 | release_parent_ref: |
953 | put_device(&session->dev); |
954 | free_conn: |
955 | kfree(conn); |
956 | return NULL; |
957 | } |
958 | |
959 | EXPORT_SYMBOL_GPL(iscsi_create_conn); |
960 | |
961 | /** |
962 | * iscsi_destroy_conn - destroy iscsi class connection |
963 | * @conn: iscsi cls session |
964 | * |
965 | * This can be called from a LLD or iscsi_transport. |
966 | */ |
967 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
968 | { |
969 | unsigned long flags; |
970 | |
971 | spin_lock_irqsave(&connlock, flags); |
972 | conn->active = 0; |
973 | list_del(&conn->conn_list); |
974 | spin_unlock_irqrestore(&connlock, flags); |
975 | |
976 | transport_unregister_device(&conn->dev); |
977 | ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n"); |
978 | device_unregister(&conn->dev); |
979 | return 0; |
980 | } |
981 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
982 | |
983 | /* |
984 | * iscsi interface functions |
985 | */ |
986 | static struct iscsi_internal * |
987 | iscsi_if_transport_lookup(struct iscsi_transport *tt) |
988 | { |
989 | struct iscsi_internal *priv; |
990 | unsigned long flags; |
991 | |
992 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
993 | list_for_each_entry(priv, &iscsi_transports, list) { |
994 | if (tt == priv->iscsi_transport) { |
995 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
996 | return priv; |
997 | } |
998 | } |
999 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
1000 | return NULL; |
1001 | } |
1002 | |
1003 | static int |
1004 | iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp) |
1005 | { |
1006 | return nlmsg_multicast(nls, skb, 0, group, gfp); |
1007 | } |
1008 | |
1009 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
1010 | char *data, uint32_t data_size) |
1011 | { |
1012 | struct nlmsghdr *nlh; |
1013 | struct sk_buff *skb; |
1014 | struct iscsi_uevent *ev; |
1015 | char *pdu; |
1016 | struct iscsi_internal *priv; |
1017 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
1018 | data_size); |
1019 | |
1020 | priv = iscsi_if_transport_lookup(conn->transport); |
1021 | if (!priv) |
1022 | return -EINVAL; |
1023 | |
1024 | skb = alloc_skb(len, GFP_ATOMIC); |
1025 | if (!skb) { |
1026 | iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED); |
1027 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver " |
1028 | "control PDU: OOM\n"); |
1029 | return -ENOMEM; |
1030 | } |
1031 | |
1032 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
1033 | ev = NLMSG_DATA(nlh); |
1034 | memset(ev, 0, sizeof(*ev)); |
1035 | ev->transport_handle = iscsi_handle(conn->transport); |
1036 | ev->type = ISCSI_KEVENT_RECV_PDU; |
1037 | ev->r.recv_req.cid = conn->cid; |
1038 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); |
1039 | pdu = (char*)ev + sizeof(*ev); |
1040 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); |
1041 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); |
1042 | |
1043 | return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC); |
1044 | } |
1045 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1046 | |
1047 | int iscsi_offload_mesg(struct Scsi_Host *shost, |
1048 | struct iscsi_transport *transport, uint32_t type, |
1049 | char *data, uint16_t data_size) |
1050 | { |
1051 | struct nlmsghdr *nlh; |
1052 | struct sk_buff *skb; |
1053 | struct iscsi_uevent *ev; |
1054 | int len = NLMSG_SPACE(sizeof(*ev) + data_size); |
1055 | |
1056 | skb = alloc_skb(len, GFP_ATOMIC); |
1057 | if (!skb) { |
1058 | printk(KERN_ERR "can not deliver iscsi offload message:OOM\n"); |
1059 | return -ENOMEM; |
1060 | } |
1061 | |
1062 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
1063 | ev = NLMSG_DATA(nlh); |
1064 | memset(ev, 0, sizeof(*ev)); |
1065 | ev->type = type; |
1066 | ev->transport_handle = iscsi_handle(transport); |
1067 | switch (type) { |
1068 | case ISCSI_KEVENT_PATH_REQ: |
1069 | ev->r.req_path.host_no = shost->host_no; |
1070 | break; |
1071 | case ISCSI_KEVENT_IF_DOWN: |
1072 | ev->r.notify_if_down.host_no = shost->host_no; |
1073 | break; |
1074 | } |
1075 | |
1076 | memcpy((char *)ev + sizeof(*ev), data, data_size); |
1077 | |
1078 | return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC); |
1079 | } |
1080 | EXPORT_SYMBOL_GPL(iscsi_offload_mesg); |
1081 | |
1082 | void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1083 | { |
1084 | struct nlmsghdr *nlh; |
1085 | struct sk_buff *skb; |
1086 | struct iscsi_uevent *ev; |
1087 | struct iscsi_internal *priv; |
1088 | int len = NLMSG_SPACE(sizeof(*ev)); |
1089 | |
1090 | priv = iscsi_if_transport_lookup(conn->transport); |
1091 | if (!priv) |
1092 | return; |
1093 | |
1094 | skb = alloc_skb(len, GFP_ATOMIC); |
1095 | if (!skb) { |
1096 | iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored " |
1097 | "conn error (%d)\n", error); |
1098 | return; |
1099 | } |
1100 | |
1101 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
1102 | ev = NLMSG_DATA(nlh); |
1103 | ev->transport_handle = iscsi_handle(conn->transport); |
1104 | ev->type = ISCSI_KEVENT_CONN_ERROR; |
1105 | ev->r.connerror.error = error; |
1106 | ev->r.connerror.cid = conn->cid; |
1107 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); |
1108 | |
1109 | iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC); |
1110 | |
1111 | iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n", |
1112 | error); |
1113 | } |
1114 | EXPORT_SYMBOL_GPL(iscsi_conn_error_event); |
1115 | |
1116 | static int |
1117 | iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi, |
1118 | void *payload, int size) |
1119 | { |
1120 | struct sk_buff *skb; |
1121 | struct nlmsghdr *nlh; |
1122 | int len = NLMSG_SPACE(size); |
1123 | int flags = multi ? NLM_F_MULTI : 0; |
1124 | int t = done ? NLMSG_DONE : type; |
1125 | |
1126 | skb = alloc_skb(len, GFP_ATOMIC); |
1127 | if (!skb) { |
1128 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); |
1129 | return -ENOMEM; |
1130 | } |
1131 | |
1132 | nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0); |
1133 | nlh->nlmsg_flags = flags; |
1134 | memcpy(NLMSG_DATA(nlh), payload, size); |
1135 | return iscsi_multicast_skb(skb, group, GFP_ATOMIC); |
1136 | } |
1137 | |
1138 | static int |
1139 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
1140 | { |
1141 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); |
1142 | struct iscsi_stats *stats; |
1143 | struct sk_buff *skbstat; |
1144 | struct iscsi_cls_conn *conn; |
1145 | struct nlmsghdr *nlhstat; |
1146 | struct iscsi_uevent *evstat; |
1147 | struct iscsi_internal *priv; |
1148 | int len = NLMSG_SPACE(sizeof(*ev) + |
1149 | sizeof(struct iscsi_stats) + |
1150 | sizeof(struct iscsi_stats_custom) * |
1151 | ISCSI_STATS_CUSTOM_MAX); |
1152 | int err = 0; |
1153 | |
1154 | priv = iscsi_if_transport_lookup(transport); |
1155 | if (!priv) |
1156 | return -EINVAL; |
1157 | |
1158 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
1159 | if (!conn) |
1160 | return -EEXIST; |
1161 | |
1162 | do { |
1163 | int actual_size; |
1164 | |
1165 | skbstat = alloc_skb(len, GFP_ATOMIC); |
1166 | if (!skbstat) { |
1167 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not " |
1168 | "deliver stats: OOM\n"); |
1169 | return -ENOMEM; |
1170 | } |
1171 | |
1172 | nlhstat = __nlmsg_put(skbstat, 0, 0, 0, |
1173 | (len - sizeof(*nlhstat)), 0); |
1174 | evstat = NLMSG_DATA(nlhstat); |
1175 | memset(evstat, 0, sizeof(*evstat)); |
1176 | evstat->transport_handle = iscsi_handle(conn->transport); |
1177 | evstat->type = nlh->nlmsg_type; |
1178 | evstat->u.get_stats.cid = |
1179 | ev->u.get_stats.cid; |
1180 | evstat->u.get_stats.sid = |
1181 | ev->u.get_stats.sid; |
1182 | stats = (struct iscsi_stats *) |
1183 | ((char*)evstat + sizeof(*evstat)); |
1184 | memset(stats, 0, sizeof(*stats)); |
1185 | |
1186 | transport->get_stats(conn, stats); |
1187 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
1188 | sizeof(struct iscsi_stats) + |
1189 | sizeof(struct iscsi_stats_custom) * |
1190 | stats->custom_length); |
1191 | actual_size -= sizeof(*nlhstat); |
1192 | actual_size = NLMSG_LENGTH(actual_size); |
1193 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
1194 | nlhstat->nlmsg_len = actual_size; |
1195 | |
1196 | err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID, |
1197 | GFP_ATOMIC); |
1198 | } while (err < 0 && err != -ECONNREFUSED); |
1199 | |
1200 | return err; |
1201 | } |
1202 | |
1203 | /** |
1204 | * iscsi_session_event - send session destr. completion event |
1205 | * @session: iscsi class session |
1206 | * @event: type of event |
1207 | */ |
1208 | int iscsi_session_event(struct iscsi_cls_session *session, |
1209 | enum iscsi_uevent_e event) |
1210 | { |
1211 | struct iscsi_internal *priv; |
1212 | struct Scsi_Host *shost; |
1213 | struct iscsi_uevent *ev; |
1214 | struct sk_buff *skb; |
1215 | struct nlmsghdr *nlh; |
1216 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
1217 | |
1218 | priv = iscsi_if_transport_lookup(session->transport); |
1219 | if (!priv) |
1220 | return -EINVAL; |
1221 | shost = iscsi_session_to_shost(session); |
1222 | |
1223 | skb = alloc_skb(len, GFP_KERNEL); |
1224 | if (!skb) { |
1225 | iscsi_cls_session_printk(KERN_ERR, session, |
1226 | "Cannot notify userspace of session " |
1227 | "event %u\n", event); |
1228 | return -ENOMEM; |
1229 | } |
1230 | |
1231 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
1232 | ev = NLMSG_DATA(nlh); |
1233 | ev->transport_handle = iscsi_handle(session->transport); |
1234 | |
1235 | ev->type = event; |
1236 | switch (event) { |
1237 | case ISCSI_KEVENT_DESTROY_SESSION: |
1238 | ev->r.d_session.host_no = shost->host_no; |
1239 | ev->r.d_session.sid = session->sid; |
1240 | break; |
1241 | case ISCSI_KEVENT_CREATE_SESSION: |
1242 | ev->r.c_session_ret.host_no = shost->host_no; |
1243 | ev->r.c_session_ret.sid = session->sid; |
1244 | break; |
1245 | case ISCSI_KEVENT_UNBIND_SESSION: |
1246 | ev->r.unbind_session.host_no = shost->host_no; |
1247 | ev->r.unbind_session.sid = session->sid; |
1248 | break; |
1249 | default: |
1250 | iscsi_cls_session_printk(KERN_ERR, session, "Invalid event " |
1251 | "%u.\n", event); |
1252 | kfree_skb(skb); |
1253 | return -EINVAL; |
1254 | } |
1255 | |
1256 | /* |
1257 | * this will occur if the daemon is not up, so we just warn |
1258 | * the user and when the daemon is restarted it will handle it |
1259 | */ |
1260 | rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL); |
1261 | if (rc == -ESRCH) |
1262 | iscsi_cls_session_printk(KERN_ERR, session, |
1263 | "Cannot notify userspace of session " |
1264 | "event %u. Check iscsi daemon\n", |
1265 | event); |
1266 | |
1267 | ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n", |
1268 | event, rc); |
1269 | return rc; |
1270 | } |
1271 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
1272 | |
1273 | static int |
1274 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep, |
1275 | struct iscsi_uevent *ev, uint32_t initial_cmdsn, |
1276 | uint16_t cmds_max, uint16_t queue_depth) |
1277 | { |
1278 | struct iscsi_transport *transport = priv->iscsi_transport; |
1279 | struct iscsi_cls_session *session; |
1280 | struct Scsi_Host *shost; |
1281 | |
1282 | session = transport->create_session(ep, cmds_max, queue_depth, |
1283 | initial_cmdsn); |
1284 | if (!session) |
1285 | return -ENOMEM; |
1286 | |
1287 | shost = iscsi_session_to_shost(session); |
1288 | ev->r.c_session_ret.host_no = shost->host_no; |
1289 | ev->r.c_session_ret.sid = session->sid; |
1290 | ISCSI_DBG_TRANS_SESSION(session, |
1291 | "Completed creating transport session\n"); |
1292 | return 0; |
1293 | } |
1294 | |
1295 | static int |
1296 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
1297 | { |
1298 | struct iscsi_cls_conn *conn; |
1299 | struct iscsi_cls_session *session; |
1300 | |
1301 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1302 | if (!session) { |
1303 | printk(KERN_ERR "iscsi: invalid session %d.\n", |
1304 | ev->u.c_conn.sid); |
1305 | return -EINVAL; |
1306 | } |
1307 | |
1308 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
1309 | if (!conn) { |
1310 | iscsi_cls_session_printk(KERN_ERR, session, |
1311 | "couldn't create a new connection."); |
1312 | return -ENOMEM; |
1313 | } |
1314 | |
1315 | ev->r.c_conn_ret.sid = session->sid; |
1316 | ev->r.c_conn_ret.cid = conn->cid; |
1317 | |
1318 | ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n"); |
1319 | return 0; |
1320 | } |
1321 | |
1322 | static int |
1323 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
1324 | { |
1325 | struct iscsi_cls_conn *conn; |
1326 | |
1327 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
1328 | if (!conn) |
1329 | return -EINVAL; |
1330 | |
1331 | ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n"); |
1332 | if (transport->destroy_conn) |
1333 | transport->destroy_conn(conn); |
1334 | |
1335 | return 0; |
1336 | } |
1337 | |
1338 | static int |
1339 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
1340 | { |
1341 | char *data = (char*)ev + sizeof(*ev); |
1342 | struct iscsi_cls_conn *conn; |
1343 | struct iscsi_cls_session *session; |
1344 | int err = 0, value = 0; |
1345 | |
1346 | session = iscsi_session_lookup(ev->u.set_param.sid); |
1347 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); |
1348 | if (!conn || !session) |
1349 | return -EINVAL; |
1350 | |
1351 | switch (ev->u.set_param.param) { |
1352 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
1353 | sscanf(data, "%d", &value); |
1354 | session->recovery_tmo = value; |
1355 | break; |
1356 | default: |
1357 | err = transport->set_param(conn, ev->u.set_param.param, |
1358 | data, ev->u.set_param.len); |
1359 | } |
1360 | |
1361 | return err; |
1362 | } |
1363 | |
1364 | static int iscsi_if_ep_connect(struct iscsi_transport *transport, |
1365 | struct iscsi_uevent *ev, int msg_type) |
1366 | { |
1367 | struct iscsi_endpoint *ep; |
1368 | struct sockaddr *dst_addr; |
1369 | struct Scsi_Host *shost = NULL; |
1370 | int non_blocking, err = 0; |
1371 | |
1372 | if (!transport->ep_connect) |
1373 | return -EINVAL; |
1374 | |
1375 | if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) { |
1376 | shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no); |
1377 | if (!shost) { |
1378 | printk(KERN_ERR "ep connect failed. Could not find " |
1379 | "host no %u\n", |
1380 | ev->u.ep_connect_through_host.host_no); |
1381 | return -ENODEV; |
1382 | } |
1383 | non_blocking = ev->u.ep_connect_through_host.non_blocking; |
1384 | } else |
1385 | non_blocking = ev->u.ep_connect.non_blocking; |
1386 | |
1387 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
1388 | ep = transport->ep_connect(shost, dst_addr, non_blocking); |
1389 | if (IS_ERR(ep)) { |
1390 | err = PTR_ERR(ep); |
1391 | goto release_host; |
1392 | } |
1393 | |
1394 | ev->r.ep_connect_ret.handle = ep->id; |
1395 | release_host: |
1396 | if (shost) |
1397 | scsi_host_put(shost); |
1398 | return err; |
1399 | } |
1400 | |
1401 | static int |
1402 | iscsi_if_transport_ep(struct iscsi_transport *transport, |
1403 | struct iscsi_uevent *ev, int msg_type) |
1404 | { |
1405 | struct iscsi_endpoint *ep; |
1406 | int rc = 0; |
1407 | |
1408 | switch (msg_type) { |
1409 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST: |
1410 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1411 | rc = iscsi_if_ep_connect(transport, ev, msg_type); |
1412 | break; |
1413 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: |
1414 | if (!transport->ep_poll) |
1415 | return -EINVAL; |
1416 | |
1417 | ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle); |
1418 | if (!ep) |
1419 | return -EINVAL; |
1420 | |
1421 | ev->r.retcode = transport->ep_poll(ep, |
1422 | ev->u.ep_poll.timeout_ms); |
1423 | break; |
1424 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: |
1425 | if (!transport->ep_disconnect) |
1426 | return -EINVAL; |
1427 | |
1428 | ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle); |
1429 | if (!ep) |
1430 | return -EINVAL; |
1431 | |
1432 | transport->ep_disconnect(ep); |
1433 | break; |
1434 | } |
1435 | return rc; |
1436 | } |
1437 | |
1438 | static int |
1439 | iscsi_tgt_dscvr(struct iscsi_transport *transport, |
1440 | struct iscsi_uevent *ev) |
1441 | { |
1442 | struct Scsi_Host *shost; |
1443 | struct sockaddr *dst_addr; |
1444 | int err; |
1445 | |
1446 | if (!transport->tgt_dscvr) |
1447 | return -EINVAL; |
1448 | |
1449 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
1450 | if (!shost) { |
1451 | printk(KERN_ERR "target discovery could not find host no %u\n", |
1452 | ev->u.tgt_dscvr.host_no); |
1453 | return -ENODEV; |
1454 | } |
1455 | |
1456 | |
1457 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
1458 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1459 | ev->u.tgt_dscvr.enable, dst_addr); |
1460 | scsi_host_put(shost); |
1461 | return err; |
1462 | } |
1463 | |
1464 | static int |
1465 | iscsi_set_host_param(struct iscsi_transport *transport, |
1466 | struct iscsi_uevent *ev) |
1467 | { |
1468 | char *data = (char*)ev + sizeof(*ev); |
1469 | struct Scsi_Host *shost; |
1470 | int err; |
1471 | |
1472 | if (!transport->set_host_param) |
1473 | return -ENOSYS; |
1474 | |
1475 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); |
1476 | if (!shost) { |
1477 | printk(KERN_ERR "set_host_param could not find host no %u\n", |
1478 | ev->u.set_host_param.host_no); |
1479 | return -ENODEV; |
1480 | } |
1481 | |
1482 | err = transport->set_host_param(shost, ev->u.set_host_param.param, |
1483 | data, ev->u.set_host_param.len); |
1484 | scsi_host_put(shost); |
1485 | return err; |
1486 | } |
1487 | |
1488 | static int |
1489 | iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
1490 | { |
1491 | struct Scsi_Host *shost; |
1492 | struct iscsi_path *params; |
1493 | int err; |
1494 | |
1495 | if (!transport->set_path) |
1496 | return -ENOSYS; |
1497 | |
1498 | shost = scsi_host_lookup(ev->u.set_path.host_no); |
1499 | if (!shost) { |
1500 | printk(KERN_ERR "set path could not find host no %u\n", |
1501 | ev->u.set_path.host_no); |
1502 | return -ENODEV; |
1503 | } |
1504 | |
1505 | params = (struct iscsi_path *)((char *)ev + sizeof(*ev)); |
1506 | err = transport->set_path(shost, params); |
1507 | |
1508 | scsi_host_put(shost); |
1509 | return err; |
1510 | } |
1511 | |
1512 | static int |
1513 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group) |
1514 | { |
1515 | int err = 0; |
1516 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); |
1517 | struct iscsi_transport *transport = NULL; |
1518 | struct iscsi_internal *priv; |
1519 | struct iscsi_cls_session *session; |
1520 | struct iscsi_cls_conn *conn; |
1521 | struct iscsi_endpoint *ep = NULL; |
1522 | |
1523 | if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE) |
1524 | *group = ISCSI_NL_GRP_UIP; |
1525 | else |
1526 | *group = ISCSI_NL_GRP_ISCSID; |
1527 | |
1528 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1529 | if (!priv) |
1530 | return -EINVAL; |
1531 | transport = priv->iscsi_transport; |
1532 | |
1533 | if (!try_module_get(transport->owner)) |
1534 | return -EINVAL; |
1535 | |
1536 | switch (nlh->nlmsg_type) { |
1537 | case ISCSI_UEVENT_CREATE_SESSION: |
1538 | err = iscsi_if_create_session(priv, ep, ev, |
1539 | ev->u.c_session.initial_cmdsn, |
1540 | ev->u.c_session.cmds_max, |
1541 | ev->u.c_session.queue_depth); |
1542 | break; |
1543 | case ISCSI_UEVENT_CREATE_BOUND_SESSION: |
1544 | ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle); |
1545 | if (!ep) { |
1546 | err = -EINVAL; |
1547 | break; |
1548 | } |
1549 | |
1550 | err = iscsi_if_create_session(priv, ep, ev, |
1551 | ev->u.c_bound_session.initial_cmdsn, |
1552 | ev->u.c_bound_session.cmds_max, |
1553 | ev->u.c_bound_session.queue_depth); |
1554 | break; |
1555 | case ISCSI_UEVENT_DESTROY_SESSION: |
1556 | session = iscsi_session_lookup(ev->u.d_session.sid); |
1557 | if (session) |
1558 | transport->destroy_session(session); |
1559 | else |
1560 | err = -EINVAL; |
1561 | break; |
1562 | case ISCSI_UEVENT_UNBIND_SESSION: |
1563 | session = iscsi_session_lookup(ev->u.d_session.sid); |
1564 | if (session) |
1565 | scsi_queue_work(iscsi_session_to_shost(session), |
1566 | &session->unbind_work); |
1567 | else |
1568 | err = -EINVAL; |
1569 | break; |
1570 | case ISCSI_UEVENT_CREATE_CONN: |
1571 | err = iscsi_if_create_conn(transport, ev); |
1572 | break; |
1573 | case ISCSI_UEVENT_DESTROY_CONN: |
1574 | err = iscsi_if_destroy_conn(transport, ev); |
1575 | break; |
1576 | case ISCSI_UEVENT_BIND_CONN: |
1577 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1578 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); |
1579 | |
1580 | if (session && conn) |
1581 | ev->r.retcode = transport->bind_conn(session, conn, |
1582 | ev->u.b_conn.transport_eph, |
1583 | ev->u.b_conn.is_leading); |
1584 | else |
1585 | err = -EINVAL; |
1586 | break; |
1587 | case ISCSI_UEVENT_SET_PARAM: |
1588 | err = iscsi_set_param(transport, ev); |
1589 | break; |
1590 | case ISCSI_UEVENT_START_CONN: |
1591 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
1592 | if (conn) |
1593 | ev->r.retcode = transport->start_conn(conn); |
1594 | else |
1595 | err = -EINVAL; |
1596 | break; |
1597 | case ISCSI_UEVENT_STOP_CONN: |
1598 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
1599 | if (conn) |
1600 | transport->stop_conn(conn, ev->u.stop_conn.flag); |
1601 | else |
1602 | err = -EINVAL; |
1603 | break; |
1604 | case ISCSI_UEVENT_SEND_PDU: |
1605 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
1606 | if (conn) |
1607 | ev->r.retcode = transport->send_pdu(conn, |
1608 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), |
1609 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, |
1610 | ev->u.send_pdu.data_size); |
1611 | else |
1612 | err = -EINVAL; |
1613 | break; |
1614 | case ISCSI_UEVENT_GET_STATS: |
1615 | err = iscsi_if_get_stats(transport, nlh); |
1616 | break; |
1617 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1618 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: |
1619 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: |
1620 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST: |
1621 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); |
1622 | break; |
1623 | case ISCSI_UEVENT_TGT_DSCVR: |
1624 | err = iscsi_tgt_dscvr(transport, ev); |
1625 | break; |
1626 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1627 | err = iscsi_set_host_param(transport, ev); |
1628 | break; |
1629 | case ISCSI_UEVENT_PATH_UPDATE: |
1630 | err = iscsi_set_path(transport, ev); |
1631 | break; |
1632 | default: |
1633 | err = -ENOSYS; |
1634 | break; |
1635 | } |
1636 | |
1637 | module_put(transport->owner); |
1638 | return err; |
1639 | } |
1640 | |
1641 | /* |
1642 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1643 | * Malformed skbs with wrong lengths or invalid creds are not processed. |
1644 | */ |
1645 | static void |
1646 | iscsi_if_rx(struct sk_buff *skb) |
1647 | { |
1648 | mutex_lock(&rx_queue_mutex); |
1649 | while (skb->len >= NLMSG_SPACE(0)) { |
1650 | int err; |
1651 | uint32_t rlen; |
1652 | struct nlmsghdr *nlh; |
1653 | struct iscsi_uevent *ev; |
1654 | uint32_t group; |
1655 | |
1656 | nlh = nlmsg_hdr(skb); |
1657 | if (nlh->nlmsg_len < sizeof(*nlh) || |
1658 | skb->len < nlh->nlmsg_len) { |
1659 | break; |
1660 | } |
1661 | |
1662 | ev = NLMSG_DATA(nlh); |
1663 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
1664 | if (rlen > skb->len) |
1665 | rlen = skb->len; |
1666 | |
1667 | err = iscsi_if_recv_msg(skb, nlh, &group); |
1668 | if (err) { |
1669 | ev->type = ISCSI_KEVENT_IF_ERROR; |
1670 | ev->iferror = err; |
1671 | } |
1672 | do { |
1673 | /* |
1674 | * special case for GET_STATS: |
1675 | * on success - sending reply and stats from |
1676 | * inside of if_recv_msg(), |
1677 | * on error - fall through. |
1678 | */ |
1679 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) |
1680 | break; |
1681 | err = iscsi_if_send_reply(group, nlh->nlmsg_seq, |
1682 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); |
1683 | } while (err < 0 && err != -ECONNREFUSED); |
1684 | skb_pull(skb, rlen); |
1685 | } |
1686 | mutex_unlock(&rx_queue_mutex); |
1687 | } |
1688 | |
1689 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1690 | struct device_attribute dev_attr_##_prefix##_##_name = \ |
1691 | __ATTR(_name,_mode,_show,_store) |
1692 | |
1693 | /* |
1694 | * iSCSI connection attrs |
1695 | */ |
1696 | #define iscsi_conn_attr_show(param) \ |
1697 | static ssize_t \ |
1698 | show_conn_param_##param(struct device *dev, \ |
1699 | struct device_attribute *attr, char *buf) \ |
1700 | { \ |
1701 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \ |
1702 | struct iscsi_transport *t = conn->transport; \ |
1703 | return t->get_conn_param(conn, param, buf); \ |
1704 | } |
1705 | |
1706 | #define iscsi_conn_attr(field, param) \ |
1707 | iscsi_conn_attr_show(param) \ |
1708 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ |
1709 | NULL); |
1710 | |
1711 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1712 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); |
1713 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); |
1714 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); |
1715 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); |
1716 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); |
1717 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); |
1718 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); |
1719 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); |
1720 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); |
1721 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); |
1722 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1723 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); |
1724 | |
1725 | /* |
1726 | * iSCSI session attrs |
1727 | */ |
1728 | #define iscsi_session_attr_show(param, perm) \ |
1729 | static ssize_t \ |
1730 | show_session_param_##param(struct device *dev, \ |
1731 | struct device_attribute *attr, char *buf) \ |
1732 | { \ |
1733 | struct iscsi_cls_session *session = \ |
1734 | iscsi_dev_to_session(dev->parent); \ |
1735 | struct iscsi_transport *t = session->transport; \ |
1736 | \ |
1737 | if (perm && !capable(CAP_SYS_ADMIN)) \ |
1738 | return -EACCES; \ |
1739 | return t->get_session_param(session, param, buf); \ |
1740 | } |
1741 | |
1742 | #define iscsi_session_attr(field, param, perm) \ |
1743 | iscsi_session_attr_show(param, perm) \ |
1744 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
1745 | NULL); |
1746 | |
1747 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1748 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); |
1749 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); |
1750 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); |
1751 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); |
1752 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); |
1753 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); |
1754 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); |
1755 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); |
1756 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); |
1757 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); |
1758 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); |
1759 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); |
1760 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); |
1761 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1762 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); |
1763 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); |
1764 | iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0); |
1765 | iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0); |
1766 | iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0) |
1767 | |
1768 | static ssize_t |
1769 | show_priv_session_state(struct device *dev, struct device_attribute *attr, |
1770 | char *buf) |
1771 | { |
1772 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent); |
1773 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); |
1774 | } |
1775 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, |
1776 | NULL); |
1777 | |
1778 | #define iscsi_priv_session_attr_show(field, format) \ |
1779 | static ssize_t \ |
1780 | show_priv_session_##field(struct device *dev, \ |
1781 | struct device_attribute *attr, char *buf) \ |
1782 | { \ |
1783 | struct iscsi_cls_session *session = \ |
1784 | iscsi_dev_to_session(dev->parent); \ |
1785 | return sprintf(buf, format"\n", session->field); \ |
1786 | } |
1787 | |
1788 | #define iscsi_priv_session_attr(field, format) \ |
1789 | iscsi_priv_session_attr_show(field, format) \ |
1790 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ |
1791 | NULL) |
1792 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
1793 | |
1794 | /* |
1795 | * iSCSI host attrs |
1796 | */ |
1797 | #define iscsi_host_attr_show(param) \ |
1798 | static ssize_t \ |
1799 | show_host_param_##param(struct device *dev, \ |
1800 | struct device_attribute *attr, char *buf) \ |
1801 | { \ |
1802 | struct Scsi_Host *shost = transport_class_to_shost(dev); \ |
1803 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ |
1804 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ |
1805 | } |
1806 | |
1807 | #define iscsi_host_attr(field, param) \ |
1808 | iscsi_host_attr_show(param) \ |
1809 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ |
1810 | NULL); |
1811 | |
1812 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1813 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
1814 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
1815 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1816 | |
1817 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1818 | do { \ |
1819 | priv->session_attrs[count] = &dev_attr_priv_sess_##field; \ |
1820 | count++; \ |
1821 | } while (0) |
1822 | |
1823 | |
1824 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1825 | do { \ |
1826 | if (tt->param_mask & param_flag) { \ |
1827 | priv->session_attrs[count] = &dev_attr_sess_##field; \ |
1828 | count++; \ |
1829 | } \ |
1830 | } while (0) |
1831 | |
1832 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1833 | do { \ |
1834 | if (tt->param_mask & param_flag) { \ |
1835 | priv->conn_attrs[count] = &dev_attr_conn_##field; \ |
1836 | count++; \ |
1837 | } \ |
1838 | } while (0) |
1839 | |
1840 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1841 | do { \ |
1842 | if (tt->host_param_mask & param_flag) { \ |
1843 | priv->host_attrs[count] = &dev_attr_host_##field; \ |
1844 | count++; \ |
1845 | } \ |
1846 | } while (0) |
1847 | |
1848 | static int iscsi_session_match(struct attribute_container *cont, |
1849 | struct device *dev) |
1850 | { |
1851 | struct iscsi_cls_session *session; |
1852 | struct Scsi_Host *shost; |
1853 | struct iscsi_internal *priv; |
1854 | |
1855 | if (!iscsi_is_session_dev(dev)) |
1856 | return 0; |
1857 | |
1858 | session = iscsi_dev_to_session(dev); |
1859 | shost = iscsi_session_to_shost(session); |
1860 | if (!shost->transportt) |
1861 | return 0; |
1862 | |
1863 | priv = to_iscsi_internal(shost->transportt); |
1864 | if (priv->session_cont.ac.class != &iscsi_session_class.class) |
1865 | return 0; |
1866 | |
1867 | return &priv->session_cont.ac == cont; |
1868 | } |
1869 | |
1870 | static int iscsi_conn_match(struct attribute_container *cont, |
1871 | struct device *dev) |
1872 | { |
1873 | struct iscsi_cls_session *session; |
1874 | struct iscsi_cls_conn *conn; |
1875 | struct Scsi_Host *shost; |
1876 | struct iscsi_internal *priv; |
1877 | |
1878 | if (!iscsi_is_conn_dev(dev)) |
1879 | return 0; |
1880 | |
1881 | conn = iscsi_dev_to_conn(dev); |
1882 | session = iscsi_dev_to_session(conn->dev.parent); |
1883 | shost = iscsi_session_to_shost(session); |
1884 | |
1885 | if (!shost->transportt) |
1886 | return 0; |
1887 | |
1888 | priv = to_iscsi_internal(shost->transportt); |
1889 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) |
1890 | return 0; |
1891 | |
1892 | return &priv->conn_cont.ac == cont; |
1893 | } |
1894 | |
1895 | static int iscsi_host_match(struct attribute_container *cont, |
1896 | struct device *dev) |
1897 | { |
1898 | struct Scsi_Host *shost; |
1899 | struct iscsi_internal *priv; |
1900 | |
1901 | if (!scsi_is_host_device(dev)) |
1902 | return 0; |
1903 | |
1904 | shost = dev_to_shost(dev); |
1905 | if (!shost->transportt || |
1906 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) |
1907 | return 0; |
1908 | |
1909 | priv = to_iscsi_internal(shost->transportt); |
1910 | return &priv->t.host_attrs.ac == cont; |
1911 | } |
1912 | |
1913 | struct scsi_transport_template * |
1914 | iscsi_register_transport(struct iscsi_transport *tt) |
1915 | { |
1916 | struct iscsi_internal *priv; |
1917 | unsigned long flags; |
1918 | int count = 0, err; |
1919 | |
1920 | BUG_ON(!tt); |
1921 | |
1922 | priv = iscsi_if_transport_lookup(tt); |
1923 | if (priv) |
1924 | return NULL; |
1925 | |
1926 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
1927 | if (!priv) |
1928 | return NULL; |
1929 | INIT_LIST_HEAD(&priv->list); |
1930 | priv->iscsi_transport = tt; |
1931 | priv->t.user_scan = iscsi_user_scan; |
1932 | priv->t.create_work_queue = 1; |
1933 | |
1934 | priv->dev.class = &iscsi_transport_class; |
1935 | dev_set_name(&priv->dev, "%s", tt->name); |
1936 | err = device_register(&priv->dev); |
1937 | if (err) |
1938 | goto free_priv; |
1939 | |
1940 | err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group); |
1941 | if (err) |
1942 | goto unregister_dev; |
1943 | |
1944 | /* host parameters */ |
1945 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; |
1946 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; |
1947 | priv->t.host_attrs.ac.match = iscsi_host_match; |
1948 | priv->t.host_size = sizeof(struct iscsi_cls_host); |
1949 | transport_container_register(&priv->t.host_attrs); |
1950 | |
1951 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
1952 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1953 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
1954 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1955 | BUG_ON(count > ISCSI_HOST_ATTRS); |
1956 | priv->host_attrs[count] = NULL; |
1957 | count = 0; |
1958 | |
1959 | /* connection parameters */ |
1960 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; |
1961 | priv->conn_cont.ac.class = &iscsi_connection_class.class; |
1962 | priv->conn_cont.ac.match = iscsi_conn_match; |
1963 | transport_container_register(&priv->conn_cont); |
1964 | |
1965 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1966 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); |
1967 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); |
1968 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); |
1969 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); |
1970 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); |
1971 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); |
1972 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); |
1973 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
1974 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1975 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); |
1976 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
1977 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); |
1978 | |
1979 | BUG_ON(count > ISCSI_CONN_ATTRS); |
1980 | priv->conn_attrs[count] = NULL; |
1981 | count = 0; |
1982 | |
1983 | /* session parameters */ |
1984 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; |
1985 | priv->session_cont.ac.class = &iscsi_session_class.class; |
1986 | priv->session_cont.ac.match = iscsi_session_match; |
1987 | transport_container_register(&priv->session_cont); |
1988 | |
1989 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1990 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); |
1991 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); |
1992 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); |
1993 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); |
1994 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); |
1995 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); |
1996 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); |
1997 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1998 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); |
1999 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
2000 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); |
2001 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); |
2002 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); |
2003 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
2004 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
2005 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); |
2006 | SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO); |
2007 | SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME); |
2008 | SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME); |
2009 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
2010 | SETUP_PRIV_SESSION_RD_ATTR(state); |
2011 | |
2012 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
2013 | priv->session_attrs[count] = NULL; |
2014 | |
2015 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
2016 | list_add(&priv->list, &iscsi_transports); |
2017 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
2018 | |
2019 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); |
2020 | return &priv->t; |
2021 | |
2022 | unregister_dev: |
2023 | device_unregister(&priv->dev); |
2024 | return NULL; |
2025 | free_priv: |
2026 | kfree(priv); |
2027 | return NULL; |
2028 | } |
2029 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
2030 | |
2031 | int iscsi_unregister_transport(struct iscsi_transport *tt) |
2032 | { |
2033 | struct iscsi_internal *priv; |
2034 | unsigned long flags; |
2035 | |
2036 | BUG_ON(!tt); |
2037 | |
2038 | mutex_lock(&rx_queue_mutex); |
2039 | |
2040 | priv = iscsi_if_transport_lookup(tt); |
2041 | BUG_ON (!priv); |
2042 | |
2043 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
2044 | list_del(&priv->list); |
2045 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); |
2046 | |
2047 | transport_container_unregister(&priv->conn_cont); |
2048 | transport_container_unregister(&priv->session_cont); |
2049 | transport_container_unregister(&priv->t.host_attrs); |
2050 | |
2051 | sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group); |
2052 | device_unregister(&priv->dev); |
2053 | mutex_unlock(&rx_queue_mutex); |
2054 | |
2055 | return 0; |
2056 | } |
2057 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); |
2058 | |
2059 | static __init int iscsi_transport_init(void) |
2060 | { |
2061 | int err; |
2062 | |
2063 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
2064 | ISCSI_TRANSPORT_VERSION); |
2065 | |
2066 | atomic_set(&iscsi_session_nr, 0); |
2067 | |
2068 | err = class_register(&iscsi_transport_class); |
2069 | if (err) |
2070 | return err; |
2071 | |
2072 | err = class_register(&iscsi_endpoint_class); |
2073 | if (err) |
2074 | goto unregister_transport_class; |
2075 | |
2076 | err = transport_class_register(&iscsi_host_class); |
2077 | if (err) |
2078 | goto unregister_endpoint_class; |
2079 | |
2080 | err = transport_class_register(&iscsi_connection_class); |
2081 | if (err) |
2082 | goto unregister_host_class; |
2083 | |
2084 | err = transport_class_register(&iscsi_session_class); |
2085 | if (err) |
2086 | goto unregister_conn_class; |
2087 | |
2088 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, |
2089 | NULL, THIS_MODULE); |
2090 | if (!nls) { |
2091 | err = -ENOBUFS; |
2092 | goto unregister_session_class; |
2093 | } |
2094 | |
2095 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
2096 | if (!iscsi_eh_timer_workq) |
2097 | goto release_nls; |
2098 | |
2099 | return 0; |
2100 | |
2101 | release_nls: |
2102 | netlink_kernel_release(nls); |
2103 | unregister_session_class: |
2104 | transport_class_unregister(&iscsi_session_class); |
2105 | unregister_conn_class: |
2106 | transport_class_unregister(&iscsi_connection_class); |
2107 | unregister_host_class: |
2108 | transport_class_unregister(&iscsi_host_class); |
2109 | unregister_endpoint_class: |
2110 | class_unregister(&iscsi_endpoint_class); |
2111 | unregister_transport_class: |
2112 | class_unregister(&iscsi_transport_class); |
2113 | return err; |
2114 | } |
2115 | |
2116 | static void __exit iscsi_transport_exit(void) |
2117 | { |
2118 | destroy_workqueue(iscsi_eh_timer_workq); |
2119 | netlink_kernel_release(nls); |
2120 | transport_class_unregister(&iscsi_connection_class); |
2121 | transport_class_unregister(&iscsi_session_class); |
2122 | transport_class_unregister(&iscsi_host_class); |
2123 | class_unregister(&iscsi_endpoint_class); |
2124 | class_unregister(&iscsi_transport_class); |
2125 | } |
2126 | |
2127 | module_init(iscsi_transport_init); |
2128 | module_exit(iscsi_transport_exit); |
2129 | |
2130 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
2131 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
2132 | "Alex Aizman <itn780@yahoo.com>"); |
2133 | MODULE_DESCRIPTION("iSCSI Transport Interface"); |
2134 | MODULE_LICENSE("GPL"); |
2135 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |
2136 |
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