Commit | Line | Data |
---|---|---|
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 | |
6eabafbe | 33 | #define ISCSI_SESSION_ATTRS 19 |
c238c3bb | 34 | #define ISCSI_CONN_ATTRS 13 |
d8196ed2 | 35 | #define ISCSI_HOST_ATTRS 4 |
31ed0bf4 | 36 | #define ISCSI_TRANSPORT_VERSION "2.0-869" |
1da177e4 LT |
37 | |
38 | struct iscsi_internal { | |
790f39a2 | 39 | int daemon_pid; |
1da177e4 | 40 | struct scsi_transport_template t; |
0896b752 AA |
41 | struct iscsi_transport *iscsi_transport; |
42 | struct list_head list; | |
0896b752 | 43 | struct class_device cdev; |
30a6c652 MC |
44 | |
45 | struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; | |
0896b752 AA |
46 | struct transport_container conn_cont; |
47 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
48 | struct transport_container session_cont; | |
1da177e4 | 49 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
50 | }; |
51 | ||
41be1444 | 52 | static atomic_t iscsi_session_nr; /* sysfs session id for next new session */ |
d8bf541e | 53 | static struct workqueue_struct *iscsi_eh_timer_workq; |
b5c7a12d | 54 | |
0896b752 AA |
55 | /* |
56 | * list of registered transports and lock that must | |
57 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 58 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
59 | */ |
60 | static LIST_HEAD(iscsi_transports); | |
61 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
62 | ||
63 | #define to_iscsi_internal(tmpl) \ | |
64 | container_of(tmpl, struct iscsi_internal, t) | |
65 | ||
66 | #define cdev_to_iscsi_internal(_cdev) \ | |
67 | container_of(_cdev, struct iscsi_internal, cdev) | |
68 | ||
69 | static void iscsi_transport_release(struct class_device *cdev) | |
70 | { | |
71 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
72 | kfree(priv); | |
73 | } | |
1da177e4 | 74 | |
0896b752 AA |
75 | /* |
76 | * iscsi_transport_class represents the iscsi_transports that are | |
77 | * registered. | |
78 | */ | |
79 | static struct class iscsi_transport_class = { | |
80 | .name = "iscsi_transport", | |
81 | .release = iscsi_transport_release, | |
82 | }; | |
83 | ||
84 | static ssize_t | |
85 | show_transport_handle(struct class_device *cdev, char *buf) | |
86 | { | |
87 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 88 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
89 | } |
90 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
91 | ||
92 | #define show_transport_attr(name, format) \ | |
93 | static ssize_t \ | |
94 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
95 | { \ | |
96 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
97 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
98 | } \ | |
99 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
100 | ||
101 | show_transport_attr(caps, "0x%x"); | |
102 | show_transport_attr(max_lun, "%d"); | |
103 | show_transport_attr(max_conn, "%d"); | |
104 | show_transport_attr(max_cmd_len, "%d"); | |
105 | ||
106 | static struct attribute *iscsi_transport_attrs[] = { | |
107 | &class_device_attr_handle.attr, | |
108 | &class_device_attr_caps.attr, | |
109 | &class_device_attr_max_lun.attr, | |
110 | &class_device_attr_max_conn.attr, | |
111 | &class_device_attr_max_cmd_len.attr, | |
112 | NULL, | |
113 | }; | |
114 | ||
115 | static struct attribute_group iscsi_transport_group = { | |
116 | .attrs = iscsi_transport_attrs, | |
117 | }; | |
118 | ||
26974789 MC |
119 | |
120 | ||
30a6c652 MC |
121 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
122 | struct class_device *cdev) | |
123 | { | |
124 | struct Scsi_Host *shost = dev_to_shost(dev); | |
125 | struct iscsi_host *ihost = shost->shost_data; | |
126 | ||
127 | memset(ihost, 0, sizeof(*ihost)); | |
128 | INIT_LIST_HEAD(&ihost->sessions); | |
129 | mutex_init(&ihost->mutex); | |
8aae18ad | 130 | atomic_set(&ihost->nr_scans, 0); |
26974789 | 131 | |
bd976f62 | 132 | snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d", |
26974789 | 133 | shost->host_no); |
bd976f62 MC |
134 | ihost->scan_workq = create_singlethread_workqueue( |
135 | ihost->scan_workq_name); | |
136 | if (!ihost->scan_workq) | |
26974789 MC |
137 | return -ENOMEM; |
138 | return 0; | |
139 | } | |
140 | ||
141 | static int iscsi_remove_host(struct transport_container *tc, struct device *dev, | |
142 | struct class_device *cdev) | |
143 | { | |
144 | struct Scsi_Host *shost = dev_to_shost(dev); | |
145 | struct iscsi_host *ihost = shost->shost_data; | |
146 | ||
bd976f62 | 147 | destroy_workqueue(ihost->scan_workq); |
30a6c652 MC |
148 | return 0; |
149 | } | |
150 | ||
151 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
152 | "iscsi_host", | |
153 | iscsi_setup_host, | |
26974789 | 154 | iscsi_remove_host, |
30a6c652 MC |
155 | NULL); |
156 | ||
0896b752 AA |
157 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
158 | "iscsi_session", | |
1da177e4 LT |
159 | NULL, |
160 | NULL, | |
161 | NULL); | |
162 | ||
0896b752 AA |
163 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
164 | "iscsi_connection", | |
1da177e4 LT |
165 | NULL, |
166 | NULL, | |
167 | NULL); | |
0896b752 AA |
168 | |
169 | static struct sock *nls; | |
0b950672 | 170 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 | 171 | |
7b7232f3 MC |
172 | static LIST_HEAD(sesslist); |
173 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
174 | static LIST_HEAD(connlist); |
175 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 176 | |
b5c7a12d MC |
177 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
178 | { | |
179 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
180 | return sess->sid; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Returns the matching session to a given sid | |
185 | */ | |
186 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
187 | { |
188 | unsigned long flags; | |
189 | struct iscsi_cls_session *sess; | |
190 | ||
191 | spin_lock_irqsave(&sesslock, flags); | |
192 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 193 | if (sess->sid == sid) { |
7b7232f3 MC |
194 | spin_unlock_irqrestore(&sesslock, flags); |
195 | return sess; | |
196 | } | |
197 | } | |
198 | spin_unlock_irqrestore(&sesslock, flags); | |
199 | return NULL; | |
200 | } | |
201 | ||
b5c7a12d MC |
202 | /* |
203 | * Returns the matching connection to a given sid / cid tuple | |
204 | */ | |
205 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
206 | { |
207 | unsigned long flags; | |
208 | struct iscsi_cls_conn *conn; | |
209 | ||
210 | spin_lock_irqsave(&connlock, flags); | |
211 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 212 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
213 | spin_unlock_irqrestore(&connlock, flags); |
214 | return conn; | |
215 | } | |
216 | } | |
217 | spin_unlock_irqrestore(&connlock, flags); | |
218 | return NULL; | |
219 | } | |
220 | ||
7b8631b5 MC |
221 | /* |
222 | * The following functions can be used by LLDs that allocate | |
223 | * their own scsi_hosts or by software iscsi LLDs | |
224 | */ | |
6eabafbe MC |
225 | static struct { |
226 | int value; | |
227 | char *name; | |
228 | } iscsi_session_state_names[] = { | |
229 | { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" }, | |
230 | { ISCSI_SESSION_FAILED, "FAILED" }, | |
231 | { ISCSI_SESSION_FREE, "FREE" }, | |
232 | }; | |
233 | ||
3b0f208a | 234 | static const char *iscsi_session_state_name(int state) |
6eabafbe MC |
235 | { |
236 | int i; | |
237 | char *name = NULL; | |
238 | ||
239 | for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { | |
240 | if (iscsi_session_state_names[i].value == state) { | |
241 | name = iscsi_session_state_names[i].name; | |
242 | break; | |
243 | } | |
244 | } | |
245 | return name; | |
246 | } | |
247 | ||
248 | int iscsi_session_chkready(struct iscsi_cls_session *session) | |
249 | { | |
250 | unsigned long flags; | |
251 | int err; | |
252 | ||
253 | spin_lock_irqsave(&session->lock, flags); | |
254 | switch (session->state) { | |
255 | case ISCSI_SESSION_LOGGED_IN: | |
256 | err = 0; | |
257 | break; | |
258 | case ISCSI_SESSION_FAILED: | |
259 | err = DID_IMM_RETRY << 16; | |
260 | break; | |
261 | case ISCSI_SESSION_FREE: | |
262 | err = DID_NO_CONNECT << 16; | |
263 | break; | |
264 | default: | |
265 | err = DID_NO_CONNECT << 16; | |
266 | break; | |
267 | } | |
268 | spin_unlock_irqrestore(&session->lock, flags); | |
269 | return err; | |
270 | } | |
271 | EXPORT_SYMBOL_GPL(iscsi_session_chkready); | |
272 | ||
7b8631b5 MC |
273 | static void iscsi_session_release(struct device *dev) |
274 | { | |
275 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 276 | struct Scsi_Host *shost; |
0896b752 | 277 | |
7b8631b5 MC |
278 | shost = iscsi_session_to_shost(session); |
279 | scsi_host_put(shost); | |
280 | kfree(session); | |
7b8631b5 | 281 | } |
0896b752 | 282 | |
7b8631b5 MC |
283 | static int iscsi_is_session_dev(const struct device *dev) |
284 | { | |
285 | return dev->release == iscsi_session_release; | |
286 | } | |
0896b752 | 287 | |
8aae18ad MC |
288 | /** |
289 | * iscsi_scan_finished - helper to report when running scans are done | |
290 | * @shost: scsi host | |
291 | * @time: scan run time | |
292 | * | |
293 | * This function can be used by drives like qla4xxx to report to the scsi | |
294 | * layer when the scans it kicked off at module load time are done. | |
295 | */ | |
296 | int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time) | |
297 | { | |
298 | struct iscsi_host *ihost = shost->shost_data; | |
299 | /* | |
300 | * qla4xxx will have kicked off some session unblocks before calling | |
301 | * scsi_scan_host, so just wait for them to complete. | |
302 | */ | |
303 | return !atomic_read(&ihost->nr_scans); | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(iscsi_scan_finished); | |
306 | ||
30a6c652 MC |
307 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
308 | uint id, uint lun) | |
309 | { | |
310 | struct iscsi_host *ihost = shost->shost_data; | |
311 | struct iscsi_cls_session *session; | |
312 | ||
313 | mutex_lock(&ihost->mutex); | |
314 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
e6f3b63f | 315 | if ((channel == SCAN_WILD_CARD || channel == 0) && |
30a6c652 | 316 | (id == SCAN_WILD_CARD || id == session->target_id)) |
e6f3b63f | 317 | scsi_scan_target(&session->dev, 0, |
30a6c652 MC |
318 | session->target_id, lun, 1); |
319 | } | |
320 | mutex_unlock(&ihost->mutex); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
bd976f62 MC |
325 | static void iscsi_scan_session(struct work_struct *work) |
326 | { | |
327 | struct iscsi_cls_session *session = | |
328 | container_of(work, struct iscsi_cls_session, scan_work); | |
8aae18ad MC |
329 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
330 | struct iscsi_host *ihost = shost->shost_data; | |
bd976f62 MC |
331 | unsigned long flags; |
332 | ||
333 | spin_lock_irqsave(&session->lock, flags); | |
334 | if (session->state != ISCSI_SESSION_LOGGED_IN) { | |
335 | spin_unlock_irqrestore(&session->lock, flags); | |
8aae18ad | 336 | goto done; |
bd976f62 MC |
337 | } |
338 | spin_unlock_irqrestore(&session->lock, flags); | |
339 | ||
340 | scsi_scan_target(&session->dev, 0, session->target_id, | |
341 | SCAN_WILD_CARD, 1); | |
8aae18ad MC |
342 | done: |
343 | atomic_dec(&ihost->nr_scans); | |
bd976f62 MC |
344 | } |
345 | ||
c4028958 | 346 | static void session_recovery_timedout(struct work_struct *work) |
30a6c652 | 347 | { |
c4028958 DH |
348 | struct iscsi_cls_session *session = |
349 | container_of(work, struct iscsi_cls_session, | |
350 | recovery_work.work); | |
6eabafbe | 351 | unsigned long flags; |
30a6c652 | 352 | |
322d739d MC |
353 | iscsi_cls_session_printk(KERN_INFO, session, |
354 | "session recovery timed out after %d secs\n", | |
355 | session->recovery_tmo); | |
30a6c652 | 356 | |
6eabafbe MC |
357 | spin_lock_irqsave(&session->lock, flags); |
358 | switch (session->state) { | |
359 | case ISCSI_SESSION_FAILED: | |
360 | session->state = ISCSI_SESSION_FREE; | |
361 | break; | |
362 | case ISCSI_SESSION_LOGGED_IN: | |
363 | case ISCSI_SESSION_FREE: | |
364 | /* we raced with the unblock's flush */ | |
365 | spin_unlock_irqrestore(&session->lock, flags); | |
366 | return; | |
367 | } | |
368 | spin_unlock_irqrestore(&session->lock, flags); | |
369 | ||
30a6c652 MC |
370 | if (session->transport->session_recovery_timedout) |
371 | session->transport->session_recovery_timedout(session); | |
372 | ||
373 | scsi_target_unblock(&session->dev); | |
374 | } | |
375 | ||
45ab33b6 | 376 | static void __iscsi_unblock_session(struct work_struct *work) |
6eabafbe | 377 | { |
45ab33b6 MC |
378 | struct iscsi_cls_session *session = |
379 | container_of(work, struct iscsi_cls_session, | |
380 | unblock_work); | |
bd976f62 MC |
381 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
382 | struct iscsi_host *ihost = shost->shost_data; | |
6eabafbe MC |
383 | unsigned long flags; |
384 | ||
45ab33b6 MC |
385 | /* |
386 | * The recovery and unblock work get run from the same workqueue, | |
387 | * so try to cancel it if it was going to run after this unblock. | |
388 | */ | |
389 | cancel_delayed_work(&session->recovery_work); | |
6eabafbe MC |
390 | spin_lock_irqsave(&session->lock, flags); |
391 | session->state = ISCSI_SESSION_LOGGED_IN; | |
392 | spin_unlock_irqrestore(&session->lock, flags); | |
45ab33b6 MC |
393 | /* start IO */ |
394 | scsi_target_unblock(&session->dev); | |
8aae18ad MC |
395 | /* |
396 | * Only do kernel scanning if the driver is properly hooked into | |
397 | * the async scanning code (drivers like iscsi_tcp do login and | |
398 | * scanning from userspace). | |
399 | */ | |
400 | if (shost->hostt->scan_finished) { | |
401 | if (queue_work(ihost->scan_workq, &session->scan_work)) | |
402 | atomic_inc(&ihost->nr_scans); | |
403 | } | |
6eabafbe | 404 | } |
45ab33b6 MC |
405 | |
406 | /** | |
407 | * iscsi_unblock_session - set a session as logged in and start IO. | |
408 | * @session: iscsi session | |
409 | * | |
410 | * Mark a session as ready to accept IO. | |
411 | */ | |
412 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
413 | { | |
414 | queue_work(iscsi_eh_timer_workq, &session->unblock_work); | |
415 | /* | |
416 | * make sure all the events have completed before tell the driver | |
417 | * it is safe | |
418 | */ | |
419 | flush_workqueue(iscsi_eh_timer_workq); | |
420 | } | |
30a6c652 MC |
421 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
422 | ||
45ab33b6 | 423 | static void __iscsi_block_session(struct work_struct *work) |
30a6c652 | 424 | { |
45ab33b6 MC |
425 | struct iscsi_cls_session *session = |
426 | container_of(work, struct iscsi_cls_session, | |
427 | block_work); | |
6eabafbe MC |
428 | unsigned long flags; |
429 | ||
430 | spin_lock_irqsave(&session->lock, flags); | |
431 | session->state = ISCSI_SESSION_FAILED; | |
432 | spin_unlock_irqrestore(&session->lock, flags); | |
30a6c652 | 433 | scsi_target_block(&session->dev); |
d8bf541e MC |
434 | queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, |
435 | session->recovery_tmo * HZ); | |
30a6c652 | 436 | } |
45ab33b6 MC |
437 | |
438 | void iscsi_block_session(struct iscsi_cls_session *session) | |
439 | { | |
440 | queue_work(iscsi_eh_timer_workq, &session->block_work); | |
441 | } | |
30a6c652 MC |
442 | EXPORT_SYMBOL_GPL(iscsi_block_session); |
443 | ||
26974789 MC |
444 | static void __iscsi_unbind_session(struct work_struct *work) |
445 | { | |
446 | struct iscsi_cls_session *session = | |
447 | container_of(work, struct iscsi_cls_session, | |
448 | unbind_work); | |
449 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
450 | struct iscsi_host *ihost = shost->shost_data; | |
451 | ||
452 | /* Prevent new scans and make sure scanning is not in progress */ | |
453 | mutex_lock(&ihost->mutex); | |
454 | if (list_empty(&session->host_list)) { | |
455 | mutex_unlock(&ihost->mutex); | |
456 | return; | |
457 | } | |
458 | list_del_init(&session->host_list); | |
459 | mutex_unlock(&ihost->mutex); | |
460 | ||
461 | scsi_remove_target(&session->dev); | |
462 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); | |
463 | } | |
464 | ||
465 | static int iscsi_unbind_session(struct iscsi_cls_session *session) | |
466 | { | |
467 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
468 | struct iscsi_host *ihost = shost->shost_data; | |
469 | ||
bd976f62 | 470 | return queue_work(ihost->scan_workq, &session->unbind_work); |
26974789 MC |
471 | } |
472 | ||
7b8631b5 | 473 | struct iscsi_cls_session * |
8434aa8b MC |
474 | iscsi_alloc_session(struct Scsi_Host *shost, |
475 | struct iscsi_transport *transport) | |
7b8631b5 MC |
476 | { |
477 | struct iscsi_cls_session *session; | |
7b8631b5 | 478 | |
b5c7a12d MC |
479 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
480 | GFP_KERNEL); | |
7b8631b5 | 481 | if (!session) |
f53a88da MC |
482 | return NULL; |
483 | ||
7b8631b5 | 484 | session->transport = transport; |
30a6c652 | 485 | session->recovery_tmo = 120; |
6eabafbe | 486 | session->state = ISCSI_SESSION_FREE; |
c4028958 | 487 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
30a6c652 MC |
488 | INIT_LIST_HEAD(&session->host_list); |
489 | INIT_LIST_HEAD(&session->sess_list); | |
45ab33b6 MC |
490 | INIT_WORK(&session->unblock_work, __iscsi_unblock_session); |
491 | INIT_WORK(&session->block_work, __iscsi_block_session); | |
26974789 | 492 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
bd976f62 | 493 | INIT_WORK(&session->scan_work, iscsi_scan_session); |
6eabafbe | 494 | spin_lock_init(&session->lock); |
7b8631b5 | 495 | |
6a8a0d36 MC |
496 | /* this is released in the dev's release function */ |
497 | scsi_host_get(shost); | |
8434aa8b MC |
498 | session->dev.parent = &shost->shost_gendev; |
499 | session->dev.release = iscsi_session_release; | |
500 | device_initialize(&session->dev); | |
b5c7a12d MC |
501 | if (transport->sessiondata_size) |
502 | session->dd_data = &session[1]; | |
8434aa8b MC |
503 | return session; |
504 | } | |
505 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
506 | ||
6a8a0d36 | 507 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
508 | { |
509 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
510 | struct iscsi_host *ihost; | |
26974789 | 511 | unsigned long flags; |
8434aa8b | 512 | int err; |
b5c7a12d | 513 | |
30a6c652 | 514 | ihost = shost->shost_data; |
41be1444 | 515 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
6a8a0d36 | 516 | session->target_id = target_id; |
30a6c652 | 517 | |
b5c7a12d MC |
518 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
519 | session->sid); | |
8434aa8b | 520 | err = device_add(&session->dev); |
7b8631b5 | 521 | if (err) { |
322d739d MC |
522 | iscsi_cls_session_printk(KERN_ERR, session, |
523 | "could not register session's dev\n"); | |
8434aa8b | 524 | goto release_host; |
7b8631b5 MC |
525 | } |
526 | transport_register_device(&session->dev); | |
527 | ||
26974789 MC |
528 | spin_lock_irqsave(&sesslock, flags); |
529 | list_add(&session->sess_list, &sesslist); | |
530 | spin_unlock_irqrestore(&sesslock, flags); | |
531 | ||
30a6c652 MC |
532 | mutex_lock(&ihost->mutex); |
533 | list_add(&session->host_list, &ihost->sessions); | |
534 | mutex_unlock(&ihost->mutex); | |
26974789 MC |
535 | |
536 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); | |
8434aa8b | 537 | return 0; |
30a6c652 | 538 | |
8434aa8b MC |
539 | release_host: |
540 | scsi_host_put(shost); | |
541 | return err; | |
7b8631b5 | 542 | } |
8434aa8b | 543 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
544 | |
545 | /** | |
8434aa8b MC |
546 | * iscsi_create_session - create iscsi class session |
547 | * @shost: scsi host | |
548 | * @transport: iscsi transport | |
eb44820c | 549 | * @target_id: which target |
7b8631b5 | 550 | * |
8434aa8b | 551 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 552 | */ |
8434aa8b MC |
553 | struct iscsi_cls_session * |
554 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
555 | struct iscsi_transport *transport, |
556 | unsigned int target_id) | |
8434aa8b MC |
557 | { |
558 | struct iscsi_cls_session *session; | |
559 | ||
560 | session = iscsi_alloc_session(shost, transport); | |
561 | if (!session) | |
562 | return NULL; | |
563 | ||
6a8a0d36 | 564 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
565 | iscsi_free_session(session); |
566 | return NULL; | |
567 | } | |
568 | return session; | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
571 | ||
26974789 MC |
572 | static void iscsi_conn_release(struct device *dev) |
573 | { | |
574 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
575 | struct device *parent = conn->dev.parent; | |
576 | ||
577 | kfree(conn); | |
578 | put_device(parent); | |
579 | } | |
580 | ||
581 | static int iscsi_is_conn_dev(const struct device *dev) | |
582 | { | |
583 | return dev->release == iscsi_conn_release; | |
584 | } | |
585 | ||
586 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) | |
587 | { | |
588 | if (!iscsi_is_conn_dev(dev)) | |
589 | return 0; | |
590 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); | |
591 | } | |
592 | ||
8434aa8b | 593 | void iscsi_remove_session(struct iscsi_cls_session *session) |
7b8631b5 | 594 | { |
30a6c652 MC |
595 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
596 | struct iscsi_host *ihost = shost->shost_data; | |
26974789 MC |
597 | unsigned long flags; |
598 | int err; | |
599 | ||
600 | spin_lock_irqsave(&sesslock, flags); | |
601 | list_del(&session->sess_list); | |
602 | spin_unlock_irqrestore(&sesslock, flags); | |
30a6c652 | 603 | |
45ab33b6 MC |
604 | /* make sure there are no blocks/unblocks queued */ |
605 | flush_workqueue(iscsi_eh_timer_workq); | |
606 | /* make sure the timedout callout is not running */ | |
607 | if (!cancel_delayed_work(&session->recovery_work)) | |
608 | flush_workqueue(iscsi_eh_timer_workq); | |
26974789 MC |
609 | /* |
610 | * If we are blocked let commands flow again. The lld or iscsi | |
611 | * layer should set up the queuecommand to fail commands. | |
45ab33b6 MC |
612 | * We assume that LLD will not be calling block/unblock while |
613 | * removing the session. | |
26974789 | 614 | */ |
6eabafbe MC |
615 | spin_lock_irqsave(&session->lock, flags); |
616 | session->state = ISCSI_SESSION_FREE; | |
617 | spin_unlock_irqrestore(&session->lock, flags); | |
bd976f62 | 618 | |
45ab33b6 MC |
619 | scsi_target_unblock(&session->dev); |
620 | /* flush running scans then delete devices */ | |
bd976f62 | 621 | flush_workqueue(ihost->scan_workq); |
45ab33b6 | 622 | __iscsi_unbind_session(&session->unbind_work); |
30a6c652 | 623 | |
26974789 MC |
624 | /* hw iscsi may not have removed all connections from session */ |
625 | err = device_for_each_child(&session->dev, NULL, | |
626 | iscsi_iter_destroy_conn_fn); | |
627 | if (err) | |
322d739d MC |
628 | iscsi_cls_session_printk(KERN_ERR, session, |
629 | "Could not delete all connections " | |
630 | "for session. Error %d.\n", err); | |
8434aa8b | 631 | |
7b8631b5 | 632 | transport_unregister_device(&session->dev); |
8434aa8b MC |
633 | device_del(&session->dev); |
634 | } | |
635 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
636 | ||
637 | void iscsi_free_session(struct iscsi_cls_session *session) | |
638 | { | |
26974789 | 639 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
8434aa8b | 640 | put_device(&session->dev); |
7b8631b5 | 641 | } |
8434aa8b MC |
642 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
643 | ||
644 | /** | |
645 | * iscsi_destroy_session - destroy iscsi session | |
646 | * @session: iscsi_session | |
647 | * | |
648 | * Can be called by a LLD or iscsi_transport. There must not be | |
649 | * any running connections. | |
eb44820c | 650 | */ |
8434aa8b MC |
651 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
652 | { | |
653 | iscsi_remove_session(session); | |
654 | iscsi_free_session(session); | |
655 | return 0; | |
656 | } | |
7b8631b5 MC |
657 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
658 | ||
7b8631b5 MC |
659 | /** |
660 | * iscsi_create_conn - create iscsi class connection | |
661 | * @session: iscsi cls session | |
662 | * @cid: connection id | |
663 | * | |
664 | * This can be called from a LLD or iscsi_transport. The connection | |
665 | * is child of the session so cid must be unique for all connections | |
666 | * on the session. | |
b5c7a12d MC |
667 | * |
668 | * Since we do not support MCS, cid will normally be zero. In some cases | |
669 | * for software iscsi we could be trying to preallocate a connection struct | |
670 | * in which case there could be two connection structs and cid would be | |
671 | * non-zero. | |
eb44820c | 672 | */ |
7b8631b5 MC |
673 | struct iscsi_cls_conn * |
674 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
675 | { | |
676 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 | 677 | struct iscsi_cls_conn *conn; |
26974789 | 678 | unsigned long flags; |
7b8631b5 MC |
679 | int err; |
680 | ||
681 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
682 | if (!conn) | |
683 | return NULL; | |
684 | ||
685 | if (transport->conndata_size) | |
686 | conn->dd_data = &conn[1]; | |
687 | ||
688 | INIT_LIST_HEAD(&conn->conn_list); | |
689 | conn->transport = transport; | |
b5c7a12d | 690 | conn->cid = cid; |
7b8631b5 MC |
691 | |
692 | /* this is released in the dev's release function */ | |
693 | if (!get_device(&session->dev)) | |
43a145a3 | 694 | goto free_conn; |
b5c7a12d | 695 | |
7b8631b5 | 696 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 697 | session->sid, cid); |
7b8631b5 MC |
698 | conn->dev.parent = &session->dev; |
699 | conn->dev.release = iscsi_conn_release; | |
700 | err = device_register(&conn->dev); | |
701 | if (err) { | |
322d739d MC |
702 | iscsi_cls_session_printk(KERN_ERR, session, "could not " |
703 | "register connection's dev\n"); | |
7b8631b5 MC |
704 | goto release_parent_ref; |
705 | } | |
706 | transport_register_device(&conn->dev); | |
26974789 MC |
707 | |
708 | spin_lock_irqsave(&connlock, flags); | |
709 | list_add(&conn->conn_list, &connlist); | |
710 | conn->active = 1; | |
711 | spin_unlock_irqrestore(&connlock, flags); | |
7b8631b5 MC |
712 | return conn; |
713 | ||
714 | release_parent_ref: | |
715 | put_device(&session->dev); | |
716 | free_conn: | |
717 | kfree(conn); | |
718 | return NULL; | |
719 | } | |
720 | ||
721 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
722 | ||
723 | /** | |
724 | * iscsi_destroy_conn - destroy iscsi class connection | |
eb44820c | 725 | * @conn: iscsi cls session |
7b8631b5 | 726 | * |
26974789 | 727 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 728 | */ |
7b8631b5 MC |
729 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
730 | { | |
26974789 MC |
731 | unsigned long flags; |
732 | ||
733 | spin_lock_irqsave(&connlock, flags); | |
734 | conn->active = 0; | |
735 | list_del(&conn->conn_list); | |
736 | spin_unlock_irqrestore(&connlock, flags); | |
737 | ||
7b8631b5 MC |
738 | transport_unregister_device(&conn->dev); |
739 | device_unregister(&conn->dev); | |
740 | return 0; | |
741 | } | |
7b8631b5 MC |
742 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
743 | ||
7b8631b5 MC |
744 | /* |
745 | * iscsi interface functions | |
746 | */ | |
0896b752 AA |
747 | static struct iscsi_internal * |
748 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
749 | { | |
750 | struct iscsi_internal *priv; | |
751 | unsigned long flags; | |
752 | ||
753 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
754 | list_for_each_entry(priv, &iscsi_transports, list) { | |
755 | if (tt == priv->iscsi_transport) { | |
756 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
757 | return priv; | |
758 | } | |
759 | } | |
760 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
761 | return NULL; | |
762 | } | |
1da177e4 | 763 | |
53cb8a1f | 764 | static int |
43a145a3 | 765 | iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) |
53cb8a1f | 766 | { |
53cb8a1f MC |
767 | int rc; |
768 | ||
9aaa2b46 | 769 | rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
53cb8a1f | 770 | if (rc < 0) { |
53cb8a1f MC |
771 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); |
772 | return rc; | |
773 | } | |
774 | ||
53cb8a1f MC |
775 | return 0; |
776 | } | |
777 | ||
0896b752 | 778 | static int |
43a145a3 | 779 | iscsi_unicast_skb(struct sk_buff *skb, int pid) |
0896b752 | 780 | { |
0896b752 | 781 | int rc; |
1da177e4 | 782 | |
790f39a2 | 783 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 | 784 | if (rc < 0) { |
0896b752 AA |
785 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
786 | return rc; | |
787 | } | |
788 | ||
0896b752 | 789 | return 0; |
1da177e4 | 790 | } |
1da177e4 | 791 | |
7b7232f3 | 792 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 793 | char *data, uint32_t data_size) |
1da177e4 | 794 | { |
0896b752 AA |
795 | struct nlmsghdr *nlh; |
796 | struct sk_buff *skb; | |
797 | struct iscsi_uevent *ev; | |
0896b752 | 798 | char *pdu; |
790f39a2 | 799 | struct iscsi_internal *priv; |
0896b752 AA |
800 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
801 | data_size); | |
802 | ||
790f39a2 MC |
803 | priv = iscsi_if_transport_lookup(conn->transport); |
804 | if (!priv) | |
805 | return -EINVAL; | |
806 | ||
43a145a3 | 807 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 808 | if (!skb) { |
7b7232f3 | 809 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
322d739d MC |
810 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver " |
811 | "control PDU: OOM\n"); | |
0896b752 AA |
812 | return -ENOMEM; |
813 | } | |
1da177e4 | 814 | |
790f39a2 | 815 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
816 | ev = NLMSG_DATA(nlh); |
817 | memset(ev, 0, sizeof(*ev)); | |
818 | ev->transport_handle = iscsi_handle(conn->transport); | |
819 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
b5c7a12d MC |
820 | ev->r.recv_req.cid = conn->cid; |
821 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
822 | pdu = (char*)ev + sizeof(*ev); |
823 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
824 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 825 | |
43a145a3 | 826 | return iscsi_unicast_skb(skb, priv->daemon_pid); |
1da177e4 | 827 | } |
0896b752 | 828 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 829 | |
7b7232f3 | 830 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 831 | { |
0896b752 AA |
832 | struct nlmsghdr *nlh; |
833 | struct sk_buff *skb; | |
834 | struct iscsi_uevent *ev; | |
790f39a2 | 835 | struct iscsi_internal *priv; |
0896b752 AA |
836 | int len = NLMSG_SPACE(sizeof(*ev)); |
837 | ||
790f39a2 MC |
838 | priv = iscsi_if_transport_lookup(conn->transport); |
839 | if (!priv) | |
840 | return; | |
841 | ||
43a145a3 | 842 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 843 | if (!skb) { |
322d739d MC |
844 | iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored " |
845 | "conn error (%d)\n", error); | |
0896b752 AA |
846 | return; |
847 | } | |
848 | ||
790f39a2 | 849 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
850 | ev = NLMSG_DATA(nlh); |
851 | ev->transport_handle = iscsi_handle(conn->transport); | |
852 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
0896b752 | 853 | ev->r.connerror.error = error; |
b5c7a12d MC |
854 | ev->r.connerror.cid = conn->cid; |
855 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 856 | |
43a145a3 | 857 | iscsi_broadcast_skb(skb, GFP_ATOMIC); |
1da177e4 | 858 | |
322d739d MC |
859 | iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n", |
860 | error); | |
0896b752 AA |
861 | } |
862 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
863 | ||
864 | static int | |
865 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
866 | void *payload, int size) | |
867 | { | |
868 | struct sk_buff *skb; | |
869 | struct nlmsghdr *nlh; | |
870 | int len = NLMSG_SPACE(size); | |
871 | int flags = multi ? NLM_F_MULTI : 0; | |
872 | int t = done ? NLMSG_DONE : type; | |
873 | ||
43a145a3 | 874 | skb = alloc_skb(len, GFP_ATOMIC); |
239a7dc2 MC |
875 | if (!skb) { |
876 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); | |
877 | return -ENOMEM; | |
878 | } | |
0896b752 AA |
879 | |
880 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
881 | nlh->nlmsg_flags = flags; | |
882 | memcpy(NLMSG_DATA(nlh), payload, size); | |
43a145a3 | 883 | return iscsi_unicast_skb(skb, pid); |
1da177e4 | 884 | } |
1da177e4 | 885 | |
7b8631b5 | 886 | static int |
5b940adf | 887 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
888 | { |
889 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
890 | struct iscsi_stats *stats; | |
891 | struct sk_buff *skbstat; | |
892 | struct iscsi_cls_conn *conn; | |
893 | struct nlmsghdr *nlhstat; | |
894 | struct iscsi_uevent *evstat; | |
790f39a2 | 895 | struct iscsi_internal *priv; |
7b8631b5 MC |
896 | int len = NLMSG_SPACE(sizeof(*ev) + |
897 | sizeof(struct iscsi_stats) + | |
898 | sizeof(struct iscsi_stats_custom) * | |
899 | ISCSI_STATS_CUSTOM_MAX); | |
900 | int err = 0; | |
0896b752 | 901 | |
790f39a2 MC |
902 | priv = iscsi_if_transport_lookup(transport); |
903 | if (!priv) | |
904 | return -EINVAL; | |
905 | ||
b5c7a12d | 906 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
907 | if (!conn) |
908 | return -EEXIST; | |
0896b752 | 909 | |
7b8631b5 MC |
910 | do { |
911 | int actual_size; | |
0896b752 | 912 | |
43a145a3 | 913 | skbstat = alloc_skb(len, GFP_ATOMIC); |
7b8631b5 | 914 | if (!skbstat) { |
322d739d MC |
915 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not " |
916 | "deliver stats: OOM\n"); | |
7b8631b5 MC |
917 | return -ENOMEM; |
918 | } | |
919 | ||
790f39a2 | 920 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
921 | (len - sizeof(*nlhstat)), 0); |
922 | evstat = NLMSG_DATA(nlhstat); | |
923 | memset(evstat, 0, sizeof(*evstat)); | |
924 | evstat->transport_handle = iscsi_handle(conn->transport); | |
925 | evstat->type = nlh->nlmsg_type; | |
b5c7a12d MC |
926 | evstat->u.get_stats.cid = |
927 | ev->u.get_stats.cid; | |
928 | evstat->u.get_stats.sid = | |
929 | ev->u.get_stats.sid; | |
7b8631b5 MC |
930 | stats = (struct iscsi_stats *) |
931 | ((char*)evstat + sizeof(*evstat)); | |
932 | memset(stats, 0, sizeof(*stats)); | |
933 | ||
7b7232f3 | 934 | transport->get_stats(conn, stats); |
7b8631b5 MC |
935 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
936 | sizeof(struct iscsi_stats) + | |
937 | sizeof(struct iscsi_stats_custom) * | |
938 | stats->custom_length); | |
939 | actual_size -= sizeof(*nlhstat); | |
940 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 941 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
942 | nlhstat->nlmsg_len = actual_size; |
943 | ||
43a145a3 | 944 | err = iscsi_unicast_skb(skbstat, priv->daemon_pid); |
7b8631b5 MC |
945 | } while (err < 0 && err != -ECONNREFUSED); |
946 | ||
947 | return err; | |
0896b752 AA |
948 | } |
949 | ||
53cb8a1f | 950 | /** |
26974789 MC |
951 | * iscsi_session_event - send session destr. completion event |
952 | * @session: iscsi class session | |
953 | * @event: type of event | |
eb44820c | 954 | */ |
26974789 MC |
955 | int iscsi_session_event(struct iscsi_cls_session *session, |
956 | enum iscsi_uevent_e event) | |
53cb8a1f MC |
957 | { |
958 | struct iscsi_internal *priv; | |
53cb8a1f MC |
959 | struct Scsi_Host *shost; |
960 | struct iscsi_uevent *ev; | |
961 | struct sk_buff *skb; | |
962 | struct nlmsghdr *nlh; | |
53cb8a1f MC |
963 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
964 | ||
26974789 | 965 | priv = iscsi_if_transport_lookup(session->transport); |
53cb8a1f MC |
966 | if (!priv) |
967 | return -EINVAL; | |
53cb8a1f MC |
968 | shost = iscsi_session_to_shost(session); |
969 | ||
43a145a3 | 970 | skb = alloc_skb(len, GFP_KERNEL); |
53cb8a1f | 971 | if (!skb) { |
322d739d MC |
972 | iscsi_cls_session_printk(KERN_ERR, session, |
973 | "Cannot notify userspace of session " | |
974 | "event %u\n", event); | |
53cb8a1f MC |
975 | return -ENOMEM; |
976 | } | |
977 | ||
978 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
979 | ev = NLMSG_DATA(nlh); | |
26974789 | 980 | ev->transport_handle = iscsi_handle(session->transport); |
53cb8a1f | 981 | |
26974789 MC |
982 | ev->type = event; |
983 | switch (event) { | |
984 | case ISCSI_KEVENT_DESTROY_SESSION: | |
985 | ev->r.d_session.host_no = shost->host_no; | |
986 | ev->r.d_session.sid = session->sid; | |
987 | break; | |
988 | case ISCSI_KEVENT_CREATE_SESSION: | |
989 | ev->r.c_session_ret.host_no = shost->host_no; | |
990 | ev->r.c_session_ret.sid = session->sid; | |
991 | break; | |
992 | case ISCSI_KEVENT_UNBIND_SESSION: | |
993 | ev->r.unbind_session.host_no = shost->host_no; | |
994 | ev->r.unbind_session.sid = session->sid; | |
995 | break; | |
996 | default: | |
322d739d MC |
997 | iscsi_cls_session_printk(KERN_ERR, session, "Invalid event " |
998 | "%u.\n", event); | |
26974789 | 999 | kfree_skb(skb); |
53cb8a1f | 1000 | return -EINVAL; |
53cb8a1f MC |
1001 | } |
1002 | ||
53cb8a1f MC |
1003 | /* |
1004 | * this will occur if the daemon is not up, so we just warn | |
1005 | * the user and when the daemon is restarted it will handle it | |
1006 | */ | |
43a145a3 | 1007 | rc = iscsi_broadcast_skb(skb, GFP_KERNEL); |
53cb8a1f | 1008 | if (rc < 0) |
322d739d MC |
1009 | iscsi_cls_session_printk(KERN_ERR, session, |
1010 | "Cannot notify userspace of session " | |
1011 | "event %u. Check iscsi daemon\n", | |
1012 | event); | |
53cb8a1f MC |
1013 | return rc; |
1014 | } | |
26974789 | 1015 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
53cb8a1f | 1016 | |
0896b752 AA |
1017 | static int |
1018 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
1019 | { | |
1020 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 1021 | struct iscsi_cls_session *session; |
b5c7a12d | 1022 | uint32_t hostno; |
0896b752 | 1023 | |
7996a778 | 1024 | session = transport->create_session(transport, &priv->t, |
1548271e MC |
1025 | ev->u.c_session.cmds_max, |
1026 | ev->u.c_session.queue_depth, | |
7b7232f3 | 1027 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 1028 | &hostno); |
7b7232f3 | 1029 | if (!session) |
7b8631b5 | 1030 | return -ENOMEM; |
0896b752 | 1031 | |
b5c7a12d MC |
1032 | ev->r.c_session_ret.host_no = hostno; |
1033 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 1034 | return 0; |
0896b752 AA |
1035 | } |
1036 | ||
1037 | static int | |
7b7232f3 | 1038 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 1039 | { |
7b8631b5 | 1040 | struct iscsi_cls_conn *conn; |
7b7232f3 | 1041 | struct iscsi_cls_session *session; |
7b8631b5 | 1042 | |
b5c7a12d MC |
1043 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1044 | if (!session) { | |
322d739d | 1045 | printk(KERN_ERR "iscsi: invalid session %d.\n", |
b5c7a12d | 1046 | ev->u.c_conn.sid); |
7b8631b5 | 1047 | return -EINVAL; |
b5c7a12d | 1048 | } |
0896b752 | 1049 | |
7b7232f3 | 1050 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d | 1051 | if (!conn) { |
322d739d MC |
1052 | iscsi_cls_session_printk(KERN_ERR, session, |
1053 | "couldn't create a new connection."); | |
7b7232f3 | 1054 | return -ENOMEM; |
b5c7a12d | 1055 | } |
0896b752 | 1056 | |
b5c7a12d MC |
1057 | ev->r.c_conn_ret.sid = session->sid; |
1058 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 | 1059 | return 0; |
1da177e4 LT |
1060 | } |
1061 | ||
0896b752 AA |
1062 | static int |
1063 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1064 | { | |
7b8631b5 | 1065 | struct iscsi_cls_conn *conn; |
0896b752 | 1066 | |
b5c7a12d | 1067 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1068 | if (!conn) |
7b8631b5 | 1069 | return -EINVAL; |
0896b752 | 1070 | |
7b8631b5 MC |
1071 | if (transport->destroy_conn) |
1072 | transport->destroy_conn(conn); | |
7b8631b5 | 1073 | return 0; |
0896b752 AA |
1074 | } |
1075 | ||
fd7255f5 MC |
1076 | static int |
1077 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1078 | { | |
1079 | char *data = (char*)ev + sizeof(*ev); | |
1080 | struct iscsi_cls_conn *conn; | |
1081 | struct iscsi_cls_session *session; | |
a54a52ca | 1082 | int err = 0, value = 0; |
fd7255f5 MC |
1083 | |
1084 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1085 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1086 | if (!conn || !session) | |
1087 | return -EINVAL; | |
1088 | ||
1089 | switch (ev->u.set_param.param) { | |
30a6c652 | 1090 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1091 | sscanf(data, "%d", &value); |
30a6c652 MC |
1092 | if (value != 0) |
1093 | session->recovery_tmo = value; | |
1094 | break; | |
fd7255f5 | 1095 | default: |
a54a52ca MC |
1096 | err = transport->set_param(conn, ev->u.set_param.param, |
1097 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1098 | } |
1099 | ||
1100 | return err; | |
1101 | } | |
1102 | ||
264faaaa OG |
1103 | static int |
1104 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1105 | struct iscsi_uevent *ev, int msg_type) | |
1106 | { | |
1107 | struct sockaddr *dst_addr; | |
1108 | int rc = 0; | |
1109 | ||
1110 | switch (msg_type) { | |
1111 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1112 | if (!transport->ep_connect) | |
1113 | return -EINVAL; | |
1114 | ||
1115 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1116 | rc = transport->ep_connect(dst_addr, | |
1117 | ev->u.ep_connect.non_blocking, | |
1118 | &ev->r.ep_connect_ret.handle); | |
1119 | break; | |
1120 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1121 | if (!transport->ep_poll) | |
1122 | return -EINVAL; | |
1123 | ||
1124 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1125 | ev->u.ep_poll.timeout_ms); | |
1126 | break; | |
1127 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1128 | if (!transport->ep_disconnect) | |
1129 | return -EINVAL; | |
1130 | ||
1131 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1132 | break; | |
1133 | } | |
1134 | return rc; | |
1135 | } | |
1136 | ||
01cb225d MC |
1137 | static int |
1138 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1139 | struct iscsi_uevent *ev) | |
1140 | { | |
2174a04e | 1141 | struct Scsi_Host *shost; |
01cb225d | 1142 | struct sockaddr *dst_addr; |
2174a04e | 1143 | int err; |
01cb225d MC |
1144 | |
1145 | if (!transport->tgt_dscvr) | |
1146 | return -EINVAL; | |
1147 | ||
2174a04e MC |
1148 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
1149 | if (IS_ERR(shost)) { | |
1150 | printk(KERN_ERR "target discovery could not find host no %u\n", | |
1151 | ev->u.tgt_dscvr.host_no); | |
1152 | return -ENODEV; | |
1153 | } | |
1154 | ||
1155 | ||
01cb225d | 1156 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
2174a04e MC |
1157 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1158 | ev->u.tgt_dscvr.enable, dst_addr); | |
1159 | scsi_host_put(shost); | |
1160 | return err; | |
01cb225d MC |
1161 | } |
1162 | ||
1d9bf13a MC |
1163 | static int |
1164 | iscsi_set_host_param(struct iscsi_transport *transport, | |
1165 | struct iscsi_uevent *ev) | |
1166 | { | |
1167 | char *data = (char*)ev + sizeof(*ev); | |
1168 | struct Scsi_Host *shost; | |
1169 | int err; | |
1170 | ||
1171 | if (!transport->set_host_param) | |
1172 | return -ENOSYS; | |
1173 | ||
1174 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); | |
1175 | if (IS_ERR(shost)) { | |
1176 | printk(KERN_ERR "set_host_param could not find host no %u\n", | |
1177 | ev->u.set_host_param.host_no); | |
1178 | return -ENODEV; | |
1179 | } | |
1180 | ||
1181 | err = transport->set_host_param(shost, ev->u.set_host_param.param, | |
1182 | data, ev->u.set_host_param.len); | |
1183 | scsi_host_put(shost); | |
1184 | return err; | |
1185 | } | |
1186 | ||
0896b752 AA |
1187 | static int |
1188 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1189 | { | |
1190 | int err = 0; | |
1191 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1192 | struct iscsi_transport *transport = NULL; | |
1193 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1194 | struct iscsi_cls_session *session; |
1195 | struct iscsi_cls_conn *conn; | |
0896b752 | 1196 | |
0896b752 AA |
1197 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1198 | if (!priv) | |
1199 | return -EINVAL; | |
1200 | transport = priv->iscsi_transport; | |
1201 | ||
7b7232f3 MC |
1202 | if (!try_module_get(transport->owner)) |
1203 | return -EINVAL; | |
1204 | ||
790f39a2 MC |
1205 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1206 | ||
0896b752 AA |
1207 | switch (nlh->nlmsg_type) { |
1208 | case ISCSI_UEVENT_CREATE_SESSION: | |
1209 | err = iscsi_if_create_session(priv, ev); | |
1210 | break; | |
1211 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1212 | session = iscsi_session_lookup(ev->u.d_session.sid); |
26974789 | 1213 | if (session) |
7b7232f3 | 1214 | transport->destroy_session(session); |
26974789 MC |
1215 | else |
1216 | err = -EINVAL; | |
1217 | break; | |
1218 | case ISCSI_UEVENT_UNBIND_SESSION: | |
1219 | session = iscsi_session_lookup(ev->u.d_session.sid); | |
1220 | if (session) | |
1221 | iscsi_unbind_session(session); | |
1222 | else | |
7b7232f3 | 1223 | err = -EINVAL; |
0896b752 AA |
1224 | break; |
1225 | case ISCSI_UEVENT_CREATE_CONN: | |
1226 | err = iscsi_if_create_conn(transport, ev); | |
1227 | break; | |
1228 | case ISCSI_UEVENT_DESTROY_CONN: | |
1229 | err = iscsi_if_destroy_conn(transport, ev); | |
1230 | break; | |
1231 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1232 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1233 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1234 | |
1235 | if (session && conn) | |
1236 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1237 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1238 | ev->u.b_conn.is_leading); |
1239 | else | |
1240 | err = -EINVAL; | |
0896b752 AA |
1241 | break; |
1242 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1243 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1244 | break; |
1245 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1246 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1247 | if (conn) |
1248 | ev->r.retcode = transport->start_conn(conn); | |
1249 | else | |
1250 | err = -EINVAL; | |
0896b752 AA |
1251 | break; |
1252 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1253 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1254 | if (conn) |
1255 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1256 | else | |
1257 | err = -EINVAL; | |
0896b752 AA |
1258 | break; |
1259 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1260 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1261 | if (conn) |
1262 | ev->r.retcode = transport->send_pdu(conn, | |
1263 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1264 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1265 | ev->u.send_pdu.data_size); | |
1266 | else | |
1267 | err = -EINVAL; | |
0896b752 AA |
1268 | break; |
1269 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1270 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1271 | break; |
264faaaa OG |
1272 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1273 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1274 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1275 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1276 | break; | |
01cb225d MC |
1277 | case ISCSI_UEVENT_TGT_DSCVR: |
1278 | err = iscsi_tgt_dscvr(transport, ev); | |
1279 | break; | |
1d9bf13a MC |
1280 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1281 | err = iscsi_set_host_param(transport, ev); | |
1282 | break; | |
0896b752 | 1283 | default: |
1d9bf13a | 1284 | err = -ENOSYS; |
0896b752 AA |
1285 | break; |
1286 | } | |
1287 | ||
7b7232f3 | 1288 | module_put(transport->owner); |
0896b752 AA |
1289 | return err; |
1290 | } | |
1291 | ||
b5c7a12d | 1292 | /* |
cd40b7d3 DL |
1293 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1294 | * Malformed skbs with wrong lengths or invalid creds are not processed. | |
b5c7a12d | 1295 | */ |
0896b752 | 1296 | static void |
cd40b7d3 | 1297 | iscsi_if_rx(struct sk_buff *skb) |
0896b752 | 1298 | { |
0b950672 | 1299 | mutex_lock(&rx_queue_mutex); |
cd40b7d3 DL |
1300 | while (skb->len >= NLMSG_SPACE(0)) { |
1301 | int err; | |
1302 | uint32_t rlen; | |
1303 | struct nlmsghdr *nlh; | |
1304 | struct iscsi_uevent *ev; | |
1305 | ||
1306 | nlh = nlmsg_hdr(skb); | |
1307 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1308 | skb->len < nlh->nlmsg_len) { | |
1309 | break; | |
ee7f8e40 | 1310 | } |
ee7f8e40 | 1311 | |
cd40b7d3 DL |
1312 | ev = NLMSG_DATA(nlh); |
1313 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1314 | if (rlen > skb->len) | |
1315 | rlen = skb->len; | |
0896b752 | 1316 | |
cd40b7d3 DL |
1317 | err = iscsi_if_recv_msg(skb, nlh); |
1318 | if (err) { | |
1319 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1320 | ev->iferror = err; | |
0896b752 | 1321 | } |
cd40b7d3 DL |
1322 | do { |
1323 | /* | |
1324 | * special case for GET_STATS: | |
1325 | * on success - sending reply and stats from | |
1326 | * inside of if_recv_msg(), | |
1327 | * on error - fall through. | |
1328 | */ | |
1329 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1330 | break; | |
1331 | err = iscsi_if_send_reply( | |
1332 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1333 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
1334 | } while (err < 0 && err != -ECONNREFUSED); | |
1335 | skb_pull(skb, rlen); | |
0896b752 | 1336 | } |
0b950672 | 1337 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1338 | } |
1da177e4 | 1339 | |
7b8631b5 MC |
1340 | #define iscsi_cdev_to_conn(_cdev) \ |
1341 | iscsi_dev_to_conn(_cdev->dev) | |
1342 | ||
fd7255f5 MC |
1343 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1344 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1345 | __ATTR(_name,_mode,_show,_store) | |
1346 | ||
1da177e4 | 1347 | /* |
0896b752 | 1348 | * iSCSI connection attrs |
1da177e4 | 1349 | */ |
a54a52ca | 1350 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1351 | static ssize_t \ |
a54a52ca | 1352 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1353 | { \ |
7b8631b5 MC |
1354 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1355 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1356 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1357 | } |
1358 | ||
a54a52ca MC |
1359 | #define iscsi_conn_attr(field, param) \ |
1360 | iscsi_conn_attr_show(param) \ | |
1361 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1362 | NULL); |
0896b752 | 1363 | |
a54a52ca MC |
1364 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1365 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1366 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1367 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1368 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1369 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1370 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1371 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1372 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1373 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1374 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
f6d5180c MC |
1375 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1376 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); | |
1da177e4 | 1377 | |
7b8631b5 MC |
1378 | #define iscsi_cdev_to_session(_cdev) \ |
1379 | iscsi_dev_to_session(_cdev->dev) | |
1380 | ||
1da177e4 | 1381 | /* |
0896b752 | 1382 | * iSCSI session attrs |
1da177e4 | 1383 | */ |
b2c64167 | 1384 | #define iscsi_session_attr_show(param, perm) \ |
fd7255f5 | 1385 | static ssize_t \ |
a54a52ca | 1386 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1387 | { \ |
1388 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1389 | struct iscsi_transport *t = session->transport; \ | |
b2c64167 MC |
1390 | \ |
1391 | if (perm && !capable(CAP_SYS_ADMIN)) \ | |
1392 | return -EACCES; \ | |
a54a52ca | 1393 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1394 | } |
1395 | ||
b2c64167 MC |
1396 | #define iscsi_session_attr(field, param, perm) \ |
1397 | iscsi_session_attr_show(param, perm) \ | |
a54a52ca | 1398 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
fd7255f5 MC |
1399 | NULL); |
1400 | ||
b2c64167 MC |
1401 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1402 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); | |
1403 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); | |
1404 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); | |
1405 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); | |
1406 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); | |
1407 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); | |
1408 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); | |
1409 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); | |
1410 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); | |
1411 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); | |
1412 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); | |
1413 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); | |
1414 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); | |
4cd49ea1 MC |
1415 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1416 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); | |
1417 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); | |
1da177e4 | 1418 | |
6eabafbe MC |
1419 | static ssize_t |
1420 | show_priv_session_state(struct class_device *cdev, char *buf) | |
1421 | { | |
1422 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); | |
1423 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); | |
1424 | } | |
1425 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, | |
1426 | NULL); | |
1427 | ||
fd7255f5 MC |
1428 | #define iscsi_priv_session_attr_show(field, format) \ |
1429 | static ssize_t \ | |
a54a52ca | 1430 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1431 | { \ |
a54a52ca | 1432 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1433 | return sprintf(buf, format"\n", session->field); \ |
1434 | } | |
1435 | ||
1436 | #define iscsi_priv_session_attr(field, format) \ | |
1437 | iscsi_priv_session_attr_show(field, format) \ | |
1438 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1439 | NULL) | |
30a6c652 | 1440 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1441 | |
1819dc81 MC |
1442 | /* |
1443 | * iSCSI host attrs | |
1444 | */ | |
1445 | #define iscsi_host_attr_show(param) \ | |
1446 | static ssize_t \ | |
1447 | show_host_param_##param(struct class_device *cdev, char *buf) \ | |
1448 | { \ | |
1449 | struct Scsi_Host *shost = transport_class_to_shost(cdev); \ | |
1450 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ | |
1451 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ | |
1452 | } | |
1453 | ||
1454 | #define iscsi_host_attr(field, param) \ | |
1455 | iscsi_host_attr_show(param) \ | |
1456 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ | |
1457 | NULL); | |
1458 | ||
d8196ed2 | 1459 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1819dc81 | 1460 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
d8196ed2 | 1461 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
8ad5781a | 1462 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1819dc81 | 1463 | |
fd7255f5 MC |
1464 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1465 | do { \ | |
1466 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1467 | count++; \ | |
1468 | } while (0) | |
1469 | ||
a54a52ca | 1470 | |
fd7255f5 MC |
1471 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1472 | do { \ | |
1473 | if (tt->param_mask & param_flag) { \ | |
1474 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1475 | count++; \ |
fd7255f5 MC |
1476 | } \ |
1477 | } while (0) | |
1478 | ||
fd7255f5 MC |
1479 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1480 | do { \ | |
1481 | if (tt->param_mask & param_flag) { \ | |
1482 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1483 | count++; \ | |
1484 | } \ | |
1485 | } while (0) | |
1da177e4 | 1486 | |
1819dc81 MC |
1487 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1488 | do { \ | |
1489 | if (tt->host_param_mask & param_flag) { \ | |
1490 | priv->host_attrs[count] = &class_device_attr_host_##field; \ | |
1491 | count++; \ | |
1492 | } \ | |
1493 | } while (0) | |
1494 | ||
0896b752 AA |
1495 | static int iscsi_session_match(struct attribute_container *cont, |
1496 | struct device *dev) | |
1da177e4 | 1497 | { |
7b8631b5 | 1498 | struct iscsi_cls_session *session; |
1da177e4 | 1499 | struct Scsi_Host *shost; |
0896b752 AA |
1500 | struct iscsi_internal *priv; |
1501 | ||
1502 | if (!iscsi_is_session_dev(dev)) | |
1503 | return 0; | |
1da177e4 | 1504 | |
7b8631b5 MC |
1505 | session = iscsi_dev_to_session(dev); |
1506 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1507 | if (!shost->transportt) |
1da177e4 LT |
1508 | return 0; |
1509 | ||
0896b752 AA |
1510 | priv = to_iscsi_internal(shost->transportt); |
1511 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1512 | return 0; |
1513 | ||
0896b752 | 1514 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1515 | } |
1516 | ||
0896b752 AA |
1517 | static int iscsi_conn_match(struct attribute_container *cont, |
1518 | struct device *dev) | |
1519 | { | |
7b8631b5 MC |
1520 | struct iscsi_cls_session *session; |
1521 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1522 | struct Scsi_Host *shost; |
0896b752 | 1523 | struct iscsi_internal *priv; |
1da177e4 | 1524 | |
0896b752 | 1525 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1526 | return 0; |
1527 | ||
7b8631b5 MC |
1528 | conn = iscsi_dev_to_conn(dev); |
1529 | session = iscsi_dev_to_session(conn->dev.parent); | |
1530 | shost = iscsi_session_to_shost(session); | |
1531 | ||
0896b752 | 1532 | if (!shost->transportt) |
1da177e4 LT |
1533 | return 0; |
1534 | ||
0896b752 AA |
1535 | priv = to_iscsi_internal(shost->transportt); |
1536 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1537 | return 0; | |
1da177e4 | 1538 | |
0896b752 AA |
1539 | return &priv->conn_cont.ac == cont; |
1540 | } | |
1541 | ||
30a6c652 MC |
1542 | static int iscsi_host_match(struct attribute_container *cont, |
1543 | struct device *dev) | |
1544 | { | |
1545 | struct Scsi_Host *shost; | |
1546 | struct iscsi_internal *priv; | |
1547 | ||
1548 | if (!scsi_is_host_device(dev)) | |
1549 | return 0; | |
1550 | ||
1551 | shost = dev_to_shost(dev); | |
1552 | if (!shost->transportt || | |
1553 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1554 | return 0; | |
1555 | ||
1556 | priv = to_iscsi_internal(shost->transportt); | |
1557 | return &priv->t.host_attrs.ac == cont; | |
1558 | } | |
1559 | ||
7b8631b5 MC |
1560 | struct scsi_transport_template * |
1561 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1562 | { |
1563 | struct iscsi_internal *priv; | |
1564 | unsigned long flags; | |
1565 | int count = 0, err; | |
1566 | ||
1567 | BUG_ON(!tt); | |
1568 | ||
1569 | priv = iscsi_if_transport_lookup(tt); | |
1570 | if (priv) | |
7b8631b5 | 1571 | return NULL; |
0896b752 | 1572 | |
24669f75 | 1573 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1574 | if (!priv) |
7b8631b5 | 1575 | return NULL; |
0896b752 | 1576 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1577 | priv->daemon_pid = -1; |
0896b752 | 1578 | priv->iscsi_transport = tt; |
30a6c652 | 1579 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1580 | |
1581 | priv->cdev.class = &iscsi_transport_class; | |
1582 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1583 | err = class_device_register(&priv->cdev); | |
1584 | if (err) | |
1585 | goto free_priv; | |
1586 | ||
1587 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1588 | if (err) | |
1589 | goto unregister_cdev; | |
1590 | ||
30a6c652 MC |
1591 | /* host parameters */ |
1592 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1593 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1594 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1595 | priv->t.host_size = sizeof(struct iscsi_host); | |
30a6c652 MC |
1596 | transport_container_register(&priv->t.host_attrs); |
1597 | ||
d8196ed2 | 1598 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
22236961 | 1599 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1819dc81 | 1600 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
8ad5781a | 1601 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1819dc81 MC |
1602 | BUG_ON(count > ISCSI_HOST_ATTRS); |
1603 | priv->host_attrs[count] = NULL; | |
1604 | count = 0; | |
1605 | ||
0896b752 AA |
1606 | /* connection parameters */ |
1607 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1608 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1609 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1610 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1611 | |
fd7255f5 MC |
1612 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1613 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1614 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1615 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1616 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1617 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1618 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1619 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1620 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1621 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1622 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
f6d5180c MC |
1623 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
1624 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); | |
0896b752 AA |
1625 | |
1626 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1627 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1628 | count = 0; |
1da177e4 | 1629 | |
0896b752 AA |
1630 | /* session parameters */ |
1631 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1632 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1633 | priv->session_cont.ac.match = iscsi_session_match; | |
1634 | transport_container_register(&priv->session_cont); | |
1635 | ||
fd7255f5 MC |
1636 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1637 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1638 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1639 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1640 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1641 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1642 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1643 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1644 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1645 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
b2c64167 MC |
1646 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
1647 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); | |
1648 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); | |
1649 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); | |
843c0a8a | 1650 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
4cd49ea1 MC |
1651 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
1652 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); | |
30a6c652 | 1653 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
6eabafbe | 1654 | SETUP_PRIV_SESSION_RD_ATTR(state); |
fd7255f5 | 1655 | |
0896b752 AA |
1656 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1657 | priv->session_attrs[count] = NULL; | |
1658 | ||
1659 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1660 | list_add(&priv->list, &iscsi_transports); | |
1661 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1662 | ||
1663 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1664 | return &priv->t; |
1da177e4 | 1665 | |
0896b752 AA |
1666 | unregister_cdev: |
1667 | class_device_unregister(&priv->cdev); | |
1668 | free_priv: | |
1669 | kfree(priv); | |
7b8631b5 | 1670 | return NULL; |
1da177e4 | 1671 | } |
0896b752 AA |
1672 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1673 | ||
1674 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1675 | { | |
1676 | struct iscsi_internal *priv; | |
1677 | unsigned long flags; | |
1678 | ||
1679 | BUG_ON(!tt); | |
1680 | ||
0b950672 | 1681 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1682 | |
1683 | priv = iscsi_if_transport_lookup(tt); | |
1684 | BUG_ON (!priv); | |
1685 | ||
0896b752 AA |
1686 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1687 | list_del(&priv->list); | |
1688 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1689 | ||
1690 | transport_container_unregister(&priv->conn_cont); | |
1691 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1692 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1693 | |
1694 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1695 | class_device_unregister(&priv->cdev); | |
0b950672 | 1696 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1697 | |
0896b752 AA |
1698 | return 0; |
1699 | } | |
1700 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1701 | |
1da177e4 LT |
1702 | static __init int iscsi_transport_init(void) |
1703 | { | |
0896b752 | 1704 | int err; |
1da177e4 | 1705 | |
09492605 | 1706 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
f4246b33 MC |
1707 | ISCSI_TRANSPORT_VERSION); |
1708 | ||
41be1444 MC |
1709 | atomic_set(&iscsi_session_nr, 0); |
1710 | ||
0896b752 | 1711 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1712 | if (err) |
1713 | return err; | |
0896b752 | 1714 | |
30a6c652 | 1715 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1716 | if (err) |
1717 | goto unregister_transport_class; | |
1718 | ||
30a6c652 MC |
1719 | err = transport_class_register(&iscsi_connection_class); |
1720 | if (err) | |
1721 | goto unregister_host_class; | |
1722 | ||
0896b752 AA |
1723 | err = transport_class_register(&iscsi_session_class); |
1724 | if (err) | |
1725 | goto unregister_conn_class; | |
1726 | ||
b4b51029 | 1727 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, |
7b8631b5 | 1728 | THIS_MODULE); |
0896b752 AA |
1729 | if (!nls) { |
1730 | err = -ENOBUFS; | |
43a145a3 | 1731 | goto unregister_session_class; |
0896b752 AA |
1732 | } |
1733 | ||
d8bf541e MC |
1734 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
1735 | if (!iscsi_eh_timer_workq) | |
1736 | goto release_nls; | |
1737 | ||
43a145a3 | 1738 | return 0; |
0896b752 | 1739 | |
d8bf541e | 1740 | release_nls: |
b7c6ba6e | 1741 | netlink_kernel_release(nls); |
0896b752 AA |
1742 | unregister_session_class: |
1743 | transport_class_unregister(&iscsi_session_class); | |
1744 | unregister_conn_class: | |
1745 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1746 | unregister_host_class: |
1747 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1748 | unregister_transport_class: |
1749 | class_unregister(&iscsi_transport_class); | |
1750 | return err; | |
1da177e4 LT |
1751 | } |
1752 | ||
1753 | static void __exit iscsi_transport_exit(void) | |
1754 | { | |
d8bf541e | 1755 | destroy_workqueue(iscsi_eh_timer_workq); |
b7c6ba6e | 1756 | netlink_kernel_release(nls); |
0896b752 AA |
1757 | transport_class_unregister(&iscsi_connection_class); |
1758 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1759 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1760 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1761 | } |
1762 | ||
1763 | module_init(iscsi_transport_init); | |
1764 | module_exit(iscsi_transport_exit); | |
1765 | ||
0896b752 AA |
1766 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1767 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1768 | "Alex Aizman <itn780@yahoo.com>"); | |
1769 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1770 | MODULE_LICENSE("GPL"); |
f4246b33 | 1771 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |