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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 |
4c851879 | 36 | #define ISCSI_TRANSPORT_VERSION "2.0-868" |
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 | ||
234 | const char *iscsi_session_state_name(int state) | |
235 | { | |
236 | int i; | |
237 | char *name = NULL; | |
238 | ||
239 | for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { | |
240 | if (iscsi_session_state_names[i].value == state) { | |
241 | name = iscsi_session_state_names[i].name; | |
242 | break; | |
243 | } | |
244 | } | |
245 | return name; | |
246 | } | |
247 | ||
248 | int iscsi_session_chkready(struct iscsi_cls_session *session) | |
249 | { | |
250 | unsigned long flags; | |
251 | int err; | |
252 | ||
253 | spin_lock_irqsave(&session->lock, flags); | |
254 | switch (session->state) { | |
255 | case ISCSI_SESSION_LOGGED_IN: | |
256 | err = 0; | |
257 | break; | |
258 | case ISCSI_SESSION_FAILED: | |
259 | err = DID_IMM_RETRY << 16; | |
260 | break; | |
261 | case ISCSI_SESSION_FREE: | |
262 | err = DID_NO_CONNECT << 16; | |
263 | break; | |
264 | default: | |
265 | err = DID_NO_CONNECT << 16; | |
266 | break; | |
267 | } | |
268 | spin_unlock_irqrestore(&session->lock, flags); | |
269 | return err; | |
270 | } | |
271 | EXPORT_SYMBOL_GPL(iscsi_session_chkready); | |
272 | ||
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 | ||
6eabafbe | 376 | void __iscsi_unblock_session(struct iscsi_cls_session *session) |
30a6c652 MC |
377 | { |
378 | if (!cancel_delayed_work(&session->recovery_work)) | |
d8bf541e | 379 | flush_workqueue(iscsi_eh_timer_workq); |
30a6c652 MC |
380 | scsi_target_unblock(&session->dev); |
381 | } | |
6eabafbe MC |
382 | |
383 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
384 | { | |
bd976f62 MC |
385 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
386 | struct iscsi_host *ihost = shost->shost_data; | |
6eabafbe MC |
387 | unsigned long flags; |
388 | ||
389 | spin_lock_irqsave(&session->lock, flags); | |
390 | session->state = ISCSI_SESSION_LOGGED_IN; | |
391 | spin_unlock_irqrestore(&session->lock, flags); | |
392 | ||
393 | __iscsi_unblock_session(session); | |
8aae18ad MC |
394 | /* |
395 | * Only do kernel scanning if the driver is properly hooked into | |
396 | * the async scanning code (drivers like iscsi_tcp do login and | |
397 | * scanning from userspace). | |
398 | */ | |
399 | if (shost->hostt->scan_finished) { | |
400 | if (queue_work(ihost->scan_workq, &session->scan_work)) | |
401 | atomic_inc(&ihost->nr_scans); | |
402 | } | |
6eabafbe | 403 | } |
30a6c652 MC |
404 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
405 | ||
406 | void iscsi_block_session(struct iscsi_cls_session *session) | |
407 | { | |
6eabafbe MC |
408 | unsigned long flags; |
409 | ||
410 | spin_lock_irqsave(&session->lock, flags); | |
411 | session->state = ISCSI_SESSION_FAILED; | |
412 | spin_unlock_irqrestore(&session->lock, flags); | |
413 | ||
30a6c652 | 414 | scsi_target_block(&session->dev); |
d8bf541e MC |
415 | queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, |
416 | session->recovery_tmo * HZ); | |
30a6c652 MC |
417 | } |
418 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
419 | ||
26974789 MC |
420 | static void __iscsi_unbind_session(struct work_struct *work) |
421 | { | |
422 | struct iscsi_cls_session *session = | |
423 | container_of(work, struct iscsi_cls_session, | |
424 | unbind_work); | |
425 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
426 | struct iscsi_host *ihost = shost->shost_data; | |
427 | ||
428 | /* Prevent new scans and make sure scanning is not in progress */ | |
429 | mutex_lock(&ihost->mutex); | |
430 | if (list_empty(&session->host_list)) { | |
431 | mutex_unlock(&ihost->mutex); | |
432 | return; | |
433 | } | |
434 | list_del_init(&session->host_list); | |
435 | mutex_unlock(&ihost->mutex); | |
436 | ||
437 | scsi_remove_target(&session->dev); | |
438 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); | |
439 | } | |
440 | ||
441 | static int iscsi_unbind_session(struct iscsi_cls_session *session) | |
442 | { | |
443 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
444 | struct iscsi_host *ihost = shost->shost_data; | |
445 | ||
bd976f62 | 446 | return queue_work(ihost->scan_workq, &session->unbind_work); |
26974789 MC |
447 | } |
448 | ||
7b8631b5 | 449 | struct iscsi_cls_session * |
8434aa8b MC |
450 | iscsi_alloc_session(struct Scsi_Host *shost, |
451 | struct iscsi_transport *transport) | |
7b8631b5 MC |
452 | { |
453 | struct iscsi_cls_session *session; | |
7b8631b5 | 454 | |
b5c7a12d MC |
455 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
456 | GFP_KERNEL); | |
7b8631b5 | 457 | if (!session) |
f53a88da MC |
458 | return NULL; |
459 | ||
7b8631b5 | 460 | session->transport = transport; |
30a6c652 | 461 | session->recovery_tmo = 120; |
6eabafbe | 462 | session->state = ISCSI_SESSION_FREE; |
c4028958 | 463 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
30a6c652 MC |
464 | INIT_LIST_HEAD(&session->host_list); |
465 | INIT_LIST_HEAD(&session->sess_list); | |
26974789 | 466 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
bd976f62 | 467 | INIT_WORK(&session->scan_work, iscsi_scan_session); |
6eabafbe | 468 | spin_lock_init(&session->lock); |
7b8631b5 | 469 | |
6a8a0d36 MC |
470 | /* this is released in the dev's release function */ |
471 | scsi_host_get(shost); | |
8434aa8b MC |
472 | session->dev.parent = &shost->shost_gendev; |
473 | session->dev.release = iscsi_session_release; | |
474 | device_initialize(&session->dev); | |
b5c7a12d MC |
475 | if (transport->sessiondata_size) |
476 | session->dd_data = &session[1]; | |
8434aa8b MC |
477 | return session; |
478 | } | |
479 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
480 | ||
6a8a0d36 | 481 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
482 | { |
483 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
484 | struct iscsi_host *ihost; | |
26974789 | 485 | unsigned long flags; |
8434aa8b | 486 | int err; |
b5c7a12d | 487 | |
30a6c652 | 488 | ihost = shost->shost_data; |
41be1444 | 489 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
6a8a0d36 | 490 | session->target_id = target_id; |
30a6c652 | 491 | |
b5c7a12d MC |
492 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
493 | session->sid); | |
8434aa8b | 494 | err = device_add(&session->dev); |
7b8631b5 | 495 | if (err) { |
322d739d MC |
496 | iscsi_cls_session_printk(KERN_ERR, session, |
497 | "could not register session's dev\n"); | |
8434aa8b | 498 | goto release_host; |
7b8631b5 MC |
499 | } |
500 | transport_register_device(&session->dev); | |
501 | ||
26974789 MC |
502 | spin_lock_irqsave(&sesslock, flags); |
503 | list_add(&session->sess_list, &sesslist); | |
504 | spin_unlock_irqrestore(&sesslock, flags); | |
505 | ||
30a6c652 MC |
506 | mutex_lock(&ihost->mutex); |
507 | list_add(&session->host_list, &ihost->sessions); | |
508 | mutex_unlock(&ihost->mutex); | |
26974789 MC |
509 | |
510 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); | |
8434aa8b | 511 | return 0; |
30a6c652 | 512 | |
8434aa8b MC |
513 | release_host: |
514 | scsi_host_put(shost); | |
515 | return err; | |
7b8631b5 | 516 | } |
8434aa8b | 517 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
518 | |
519 | /** | |
8434aa8b MC |
520 | * iscsi_create_session - create iscsi class session |
521 | * @shost: scsi host | |
522 | * @transport: iscsi transport | |
eb44820c | 523 | * @target_id: which target |
7b8631b5 | 524 | * |
8434aa8b | 525 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 526 | */ |
8434aa8b MC |
527 | struct iscsi_cls_session * |
528 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
529 | struct iscsi_transport *transport, |
530 | unsigned int target_id) | |
8434aa8b MC |
531 | { |
532 | struct iscsi_cls_session *session; | |
533 | ||
534 | session = iscsi_alloc_session(shost, transport); | |
535 | if (!session) | |
536 | return NULL; | |
537 | ||
6a8a0d36 | 538 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
539 | iscsi_free_session(session); |
540 | return NULL; | |
541 | } | |
542 | return session; | |
543 | } | |
544 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
545 | ||
26974789 MC |
546 | static void iscsi_conn_release(struct device *dev) |
547 | { | |
548 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
549 | struct device *parent = conn->dev.parent; | |
550 | ||
551 | kfree(conn); | |
552 | put_device(parent); | |
553 | } | |
554 | ||
555 | static int iscsi_is_conn_dev(const struct device *dev) | |
556 | { | |
557 | return dev->release == iscsi_conn_release; | |
558 | } | |
559 | ||
560 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) | |
561 | { | |
562 | if (!iscsi_is_conn_dev(dev)) | |
563 | return 0; | |
564 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); | |
565 | } | |
566 | ||
8434aa8b | 567 | void iscsi_remove_session(struct iscsi_cls_session *session) |
7b8631b5 | 568 | { |
30a6c652 MC |
569 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
570 | struct iscsi_host *ihost = shost->shost_data; | |
26974789 MC |
571 | unsigned long flags; |
572 | int err; | |
573 | ||
574 | spin_lock_irqsave(&sesslock, flags); | |
575 | list_del(&session->sess_list); | |
576 | spin_unlock_irqrestore(&sesslock, flags); | |
30a6c652 | 577 | |
26974789 MC |
578 | /* |
579 | * If we are blocked let commands flow again. The lld or iscsi | |
580 | * layer should set up the queuecommand to fail commands. | |
581 | */ | |
6eabafbe MC |
582 | spin_lock_irqsave(&session->lock, flags); |
583 | session->state = ISCSI_SESSION_FREE; | |
584 | spin_unlock_irqrestore(&session->lock, flags); | |
585 | __iscsi_unblock_session(session); | |
8aae18ad | 586 | __iscsi_unbind_session(&session->unbind_work); |
bd976f62 MC |
587 | |
588 | /* flush running scans */ | |
589 | flush_workqueue(ihost->scan_workq); | |
26974789 MC |
590 | /* |
591 | * If the session dropped while removing devices then we need to make | |
592 | * sure it is not blocked | |
593 | */ | |
30a6c652 | 594 | if (!cancel_delayed_work(&session->recovery_work)) |
d8bf541e | 595 | flush_workqueue(iscsi_eh_timer_workq); |
30a6c652 | 596 | |
26974789 MC |
597 | /* hw iscsi may not have removed all connections from session */ |
598 | err = device_for_each_child(&session->dev, NULL, | |
599 | iscsi_iter_destroy_conn_fn); | |
600 | if (err) | |
322d739d MC |
601 | iscsi_cls_session_printk(KERN_ERR, session, |
602 | "Could not delete all connections " | |
603 | "for session. Error %d.\n", err); | |
8434aa8b | 604 | |
7b8631b5 | 605 | transport_unregister_device(&session->dev); |
8434aa8b MC |
606 | device_del(&session->dev); |
607 | } | |
608 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
609 | ||
610 | void iscsi_free_session(struct iscsi_cls_session *session) | |
611 | { | |
26974789 | 612 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
8434aa8b | 613 | put_device(&session->dev); |
7b8631b5 | 614 | } |
8434aa8b MC |
615 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
616 | ||
617 | /** | |
618 | * iscsi_destroy_session - destroy iscsi session | |
619 | * @session: iscsi_session | |
620 | * | |
621 | * Can be called by a LLD or iscsi_transport. There must not be | |
622 | * any running connections. | |
eb44820c | 623 | */ |
8434aa8b MC |
624 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
625 | { | |
626 | iscsi_remove_session(session); | |
627 | iscsi_free_session(session); | |
628 | return 0; | |
629 | } | |
7b8631b5 MC |
630 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
631 | ||
7b8631b5 MC |
632 | /** |
633 | * iscsi_create_conn - create iscsi class connection | |
634 | * @session: iscsi cls session | |
635 | * @cid: connection id | |
636 | * | |
637 | * This can be called from a LLD or iscsi_transport. The connection | |
638 | * is child of the session so cid must be unique for all connections | |
639 | * on the session. | |
b5c7a12d MC |
640 | * |
641 | * Since we do not support MCS, cid will normally be zero. In some cases | |
642 | * for software iscsi we could be trying to preallocate a connection struct | |
643 | * in which case there could be two connection structs and cid would be | |
644 | * non-zero. | |
eb44820c | 645 | */ |
7b8631b5 MC |
646 | struct iscsi_cls_conn * |
647 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
648 | { | |
649 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 | 650 | struct iscsi_cls_conn *conn; |
26974789 | 651 | unsigned long flags; |
7b8631b5 MC |
652 | int err; |
653 | ||
654 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
655 | if (!conn) | |
656 | return NULL; | |
657 | ||
658 | if (transport->conndata_size) | |
659 | conn->dd_data = &conn[1]; | |
660 | ||
661 | INIT_LIST_HEAD(&conn->conn_list); | |
662 | conn->transport = transport; | |
b5c7a12d | 663 | conn->cid = cid; |
7b8631b5 MC |
664 | |
665 | /* this is released in the dev's release function */ | |
666 | if (!get_device(&session->dev)) | |
43a145a3 | 667 | goto free_conn; |
b5c7a12d | 668 | |
7b8631b5 | 669 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 670 | session->sid, cid); |
7b8631b5 MC |
671 | conn->dev.parent = &session->dev; |
672 | conn->dev.release = iscsi_conn_release; | |
673 | err = device_register(&conn->dev); | |
674 | if (err) { | |
322d739d MC |
675 | iscsi_cls_session_printk(KERN_ERR, session, "could not " |
676 | "register connection's dev\n"); | |
7b8631b5 MC |
677 | goto release_parent_ref; |
678 | } | |
679 | transport_register_device(&conn->dev); | |
26974789 MC |
680 | |
681 | spin_lock_irqsave(&connlock, flags); | |
682 | list_add(&conn->conn_list, &connlist); | |
683 | conn->active = 1; | |
684 | spin_unlock_irqrestore(&connlock, flags); | |
7b8631b5 MC |
685 | return conn; |
686 | ||
687 | release_parent_ref: | |
688 | put_device(&session->dev); | |
689 | free_conn: | |
690 | kfree(conn); | |
691 | return NULL; | |
692 | } | |
693 | ||
694 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
695 | ||
696 | /** | |
697 | * iscsi_destroy_conn - destroy iscsi class connection | |
eb44820c | 698 | * @conn: iscsi cls session |
7b8631b5 | 699 | * |
26974789 | 700 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 701 | */ |
7b8631b5 MC |
702 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
703 | { | |
26974789 MC |
704 | unsigned long flags; |
705 | ||
706 | spin_lock_irqsave(&connlock, flags); | |
707 | conn->active = 0; | |
708 | list_del(&conn->conn_list); | |
709 | spin_unlock_irqrestore(&connlock, flags); | |
710 | ||
7b8631b5 MC |
711 | transport_unregister_device(&conn->dev); |
712 | device_unregister(&conn->dev); | |
713 | return 0; | |
714 | } | |
7b8631b5 MC |
715 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
716 | ||
7b8631b5 MC |
717 | /* |
718 | * iscsi interface functions | |
719 | */ | |
0896b752 AA |
720 | static struct iscsi_internal * |
721 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
722 | { | |
723 | struct iscsi_internal *priv; | |
724 | unsigned long flags; | |
725 | ||
726 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
727 | list_for_each_entry(priv, &iscsi_transports, list) { | |
728 | if (tt == priv->iscsi_transport) { | |
729 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
730 | return priv; | |
731 | } | |
732 | } | |
733 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
734 | return NULL; | |
735 | } | |
1da177e4 | 736 | |
53cb8a1f | 737 | static int |
43a145a3 | 738 | iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) |
53cb8a1f | 739 | { |
53cb8a1f MC |
740 | int rc; |
741 | ||
9aaa2b46 | 742 | rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
53cb8a1f | 743 | if (rc < 0) { |
53cb8a1f MC |
744 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); |
745 | return rc; | |
746 | } | |
747 | ||
53cb8a1f MC |
748 | return 0; |
749 | } | |
750 | ||
0896b752 | 751 | static int |
43a145a3 | 752 | iscsi_unicast_skb(struct sk_buff *skb, int pid) |
0896b752 | 753 | { |
0896b752 | 754 | int rc; |
1da177e4 | 755 | |
790f39a2 | 756 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 | 757 | if (rc < 0) { |
0896b752 AA |
758 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
759 | return rc; | |
760 | } | |
761 | ||
0896b752 | 762 | return 0; |
1da177e4 | 763 | } |
1da177e4 | 764 | |
7b7232f3 | 765 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 766 | char *data, uint32_t data_size) |
1da177e4 | 767 | { |
0896b752 AA |
768 | struct nlmsghdr *nlh; |
769 | struct sk_buff *skb; | |
770 | struct iscsi_uevent *ev; | |
0896b752 | 771 | char *pdu; |
790f39a2 | 772 | struct iscsi_internal *priv; |
0896b752 AA |
773 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
774 | data_size); | |
775 | ||
790f39a2 MC |
776 | priv = iscsi_if_transport_lookup(conn->transport); |
777 | if (!priv) | |
778 | return -EINVAL; | |
779 | ||
43a145a3 | 780 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 781 | if (!skb) { |
7b7232f3 | 782 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
322d739d MC |
783 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver " |
784 | "control PDU: OOM\n"); | |
0896b752 AA |
785 | return -ENOMEM; |
786 | } | |
1da177e4 | 787 | |
790f39a2 | 788 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
789 | ev = NLMSG_DATA(nlh); |
790 | memset(ev, 0, sizeof(*ev)); | |
791 | ev->transport_handle = iscsi_handle(conn->transport); | |
792 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
b5c7a12d MC |
793 | ev->r.recv_req.cid = conn->cid; |
794 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
795 | pdu = (char*)ev + sizeof(*ev); |
796 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
797 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 798 | |
43a145a3 | 799 | return iscsi_unicast_skb(skb, priv->daemon_pid); |
1da177e4 | 800 | } |
0896b752 | 801 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 802 | |
7b7232f3 | 803 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 804 | { |
6eabafbe | 805 | struct iscsi_cls_session *session = iscsi_conn_to_session(conn); |
0896b752 AA |
806 | struct nlmsghdr *nlh; |
807 | struct sk_buff *skb; | |
808 | struct iscsi_uevent *ev; | |
790f39a2 | 809 | struct iscsi_internal *priv; |
0896b752 | 810 | int len = NLMSG_SPACE(sizeof(*ev)); |
6eabafbe | 811 | unsigned long flags; |
0896b752 | 812 | |
790f39a2 MC |
813 | priv = iscsi_if_transport_lookup(conn->transport); |
814 | if (!priv) | |
815 | return; | |
816 | ||
6eabafbe MC |
817 | spin_lock_irqsave(&session->lock, flags); |
818 | if (session->state == ISCSI_SESSION_LOGGED_IN) | |
819 | session->state = ISCSI_SESSION_FAILED; | |
820 | spin_unlock_irqrestore(&session->lock, flags); | |
821 | ||
43a145a3 | 822 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 823 | if (!skb) { |
322d739d MC |
824 | iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored " |
825 | "conn error (%d)\n", error); | |
0896b752 AA |
826 | return; |
827 | } | |
828 | ||
790f39a2 | 829 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
830 | ev = NLMSG_DATA(nlh); |
831 | ev->transport_handle = iscsi_handle(conn->transport); | |
832 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
0896b752 | 833 | ev->r.connerror.error = error; |
b5c7a12d MC |
834 | ev->r.connerror.cid = conn->cid; |
835 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 836 | |
43a145a3 | 837 | iscsi_broadcast_skb(skb, GFP_ATOMIC); |
1da177e4 | 838 | |
322d739d MC |
839 | iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n", |
840 | error); | |
0896b752 AA |
841 | } |
842 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
843 | ||
844 | static int | |
845 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
846 | void *payload, int size) | |
847 | { | |
848 | struct sk_buff *skb; | |
849 | struct nlmsghdr *nlh; | |
850 | int len = NLMSG_SPACE(size); | |
851 | int flags = multi ? NLM_F_MULTI : 0; | |
852 | int t = done ? NLMSG_DONE : type; | |
853 | ||
43a145a3 | 854 | skb = alloc_skb(len, GFP_ATOMIC); |
239a7dc2 MC |
855 | if (!skb) { |
856 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); | |
857 | return -ENOMEM; | |
858 | } | |
0896b752 AA |
859 | |
860 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
861 | nlh->nlmsg_flags = flags; | |
862 | memcpy(NLMSG_DATA(nlh), payload, size); | |
43a145a3 | 863 | return iscsi_unicast_skb(skb, pid); |
1da177e4 | 864 | } |
1da177e4 | 865 | |
7b8631b5 | 866 | static int |
5b940adf | 867 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
868 | { |
869 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
870 | struct iscsi_stats *stats; | |
871 | struct sk_buff *skbstat; | |
872 | struct iscsi_cls_conn *conn; | |
873 | struct nlmsghdr *nlhstat; | |
874 | struct iscsi_uevent *evstat; | |
790f39a2 | 875 | struct iscsi_internal *priv; |
7b8631b5 MC |
876 | int len = NLMSG_SPACE(sizeof(*ev) + |
877 | sizeof(struct iscsi_stats) + | |
878 | sizeof(struct iscsi_stats_custom) * | |
879 | ISCSI_STATS_CUSTOM_MAX); | |
880 | int err = 0; | |
0896b752 | 881 | |
790f39a2 MC |
882 | priv = iscsi_if_transport_lookup(transport); |
883 | if (!priv) | |
884 | return -EINVAL; | |
885 | ||
b5c7a12d | 886 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
887 | if (!conn) |
888 | return -EEXIST; | |
0896b752 | 889 | |
7b8631b5 MC |
890 | do { |
891 | int actual_size; | |
0896b752 | 892 | |
43a145a3 | 893 | skbstat = alloc_skb(len, GFP_ATOMIC); |
7b8631b5 | 894 | if (!skbstat) { |
322d739d MC |
895 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not " |
896 | "deliver stats: OOM\n"); | |
7b8631b5 MC |
897 | return -ENOMEM; |
898 | } | |
899 | ||
790f39a2 | 900 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
901 | (len - sizeof(*nlhstat)), 0); |
902 | evstat = NLMSG_DATA(nlhstat); | |
903 | memset(evstat, 0, sizeof(*evstat)); | |
904 | evstat->transport_handle = iscsi_handle(conn->transport); | |
905 | evstat->type = nlh->nlmsg_type; | |
b5c7a12d MC |
906 | evstat->u.get_stats.cid = |
907 | ev->u.get_stats.cid; | |
908 | evstat->u.get_stats.sid = | |
909 | ev->u.get_stats.sid; | |
7b8631b5 MC |
910 | stats = (struct iscsi_stats *) |
911 | ((char*)evstat + sizeof(*evstat)); | |
912 | memset(stats, 0, sizeof(*stats)); | |
913 | ||
7b7232f3 | 914 | transport->get_stats(conn, stats); |
7b8631b5 MC |
915 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
916 | sizeof(struct iscsi_stats) + | |
917 | sizeof(struct iscsi_stats_custom) * | |
918 | stats->custom_length); | |
919 | actual_size -= sizeof(*nlhstat); | |
920 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 921 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
922 | nlhstat->nlmsg_len = actual_size; |
923 | ||
43a145a3 | 924 | err = iscsi_unicast_skb(skbstat, priv->daemon_pid); |
7b8631b5 MC |
925 | } while (err < 0 && err != -ECONNREFUSED); |
926 | ||
927 | return err; | |
0896b752 AA |
928 | } |
929 | ||
53cb8a1f | 930 | /** |
26974789 MC |
931 | * iscsi_session_event - send session destr. completion event |
932 | * @session: iscsi class session | |
933 | * @event: type of event | |
eb44820c | 934 | */ |
26974789 MC |
935 | int iscsi_session_event(struct iscsi_cls_session *session, |
936 | enum iscsi_uevent_e event) | |
53cb8a1f MC |
937 | { |
938 | struct iscsi_internal *priv; | |
53cb8a1f MC |
939 | struct Scsi_Host *shost; |
940 | struct iscsi_uevent *ev; | |
941 | struct sk_buff *skb; | |
942 | struct nlmsghdr *nlh; | |
53cb8a1f MC |
943 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
944 | ||
26974789 | 945 | priv = iscsi_if_transport_lookup(session->transport); |
53cb8a1f MC |
946 | if (!priv) |
947 | return -EINVAL; | |
53cb8a1f MC |
948 | shost = iscsi_session_to_shost(session); |
949 | ||
43a145a3 | 950 | skb = alloc_skb(len, GFP_KERNEL); |
53cb8a1f | 951 | if (!skb) { |
322d739d MC |
952 | iscsi_cls_session_printk(KERN_ERR, session, |
953 | "Cannot notify userspace of session " | |
954 | "event %u\n", event); | |
53cb8a1f MC |
955 | return -ENOMEM; |
956 | } | |
957 | ||
958 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
959 | ev = NLMSG_DATA(nlh); | |
26974789 | 960 | ev->transport_handle = iscsi_handle(session->transport); |
53cb8a1f | 961 | |
26974789 MC |
962 | ev->type = event; |
963 | switch (event) { | |
964 | case ISCSI_KEVENT_DESTROY_SESSION: | |
965 | ev->r.d_session.host_no = shost->host_no; | |
966 | ev->r.d_session.sid = session->sid; | |
967 | break; | |
968 | case ISCSI_KEVENT_CREATE_SESSION: | |
969 | ev->r.c_session_ret.host_no = shost->host_no; | |
970 | ev->r.c_session_ret.sid = session->sid; | |
971 | break; | |
972 | case ISCSI_KEVENT_UNBIND_SESSION: | |
973 | ev->r.unbind_session.host_no = shost->host_no; | |
974 | ev->r.unbind_session.sid = session->sid; | |
975 | break; | |
976 | default: | |
322d739d MC |
977 | iscsi_cls_session_printk(KERN_ERR, session, "Invalid event " |
978 | "%u.\n", event); | |
26974789 | 979 | kfree_skb(skb); |
53cb8a1f | 980 | return -EINVAL; |
53cb8a1f MC |
981 | } |
982 | ||
53cb8a1f MC |
983 | /* |
984 | * this will occur if the daemon is not up, so we just warn | |
985 | * the user and when the daemon is restarted it will handle it | |
986 | */ | |
43a145a3 | 987 | rc = iscsi_broadcast_skb(skb, GFP_KERNEL); |
53cb8a1f | 988 | if (rc < 0) |
322d739d MC |
989 | iscsi_cls_session_printk(KERN_ERR, session, |
990 | "Cannot notify userspace of session " | |
991 | "event %u. Check iscsi daemon\n", | |
992 | event); | |
53cb8a1f MC |
993 | return rc; |
994 | } | |
26974789 | 995 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
53cb8a1f | 996 | |
0896b752 AA |
997 | static int |
998 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
999 | { | |
1000 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 1001 | struct iscsi_cls_session *session; |
b5c7a12d | 1002 | uint32_t hostno; |
0896b752 | 1003 | |
7996a778 | 1004 | session = transport->create_session(transport, &priv->t, |
1548271e MC |
1005 | ev->u.c_session.cmds_max, |
1006 | ev->u.c_session.queue_depth, | |
7b7232f3 | 1007 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 1008 | &hostno); |
7b7232f3 | 1009 | if (!session) |
7b8631b5 | 1010 | return -ENOMEM; |
0896b752 | 1011 | |
b5c7a12d MC |
1012 | ev->r.c_session_ret.host_no = hostno; |
1013 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 1014 | return 0; |
0896b752 AA |
1015 | } |
1016 | ||
1017 | static int | |
7b7232f3 | 1018 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 1019 | { |
7b8631b5 | 1020 | struct iscsi_cls_conn *conn; |
7b7232f3 | 1021 | struct iscsi_cls_session *session; |
7b8631b5 | 1022 | |
b5c7a12d MC |
1023 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1024 | if (!session) { | |
322d739d | 1025 | printk(KERN_ERR "iscsi: invalid session %d.\n", |
b5c7a12d | 1026 | ev->u.c_conn.sid); |
7b8631b5 | 1027 | return -EINVAL; |
b5c7a12d | 1028 | } |
0896b752 | 1029 | |
7b7232f3 | 1030 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d | 1031 | if (!conn) { |
322d739d MC |
1032 | iscsi_cls_session_printk(KERN_ERR, session, |
1033 | "couldn't create a new connection."); | |
7b7232f3 | 1034 | return -ENOMEM; |
b5c7a12d | 1035 | } |
0896b752 | 1036 | |
b5c7a12d MC |
1037 | ev->r.c_conn_ret.sid = session->sid; |
1038 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 | 1039 | return 0; |
1da177e4 LT |
1040 | } |
1041 | ||
0896b752 AA |
1042 | static int |
1043 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1044 | { | |
7b8631b5 | 1045 | struct iscsi_cls_conn *conn; |
0896b752 | 1046 | |
b5c7a12d | 1047 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1048 | if (!conn) |
7b8631b5 | 1049 | return -EINVAL; |
0896b752 | 1050 | |
7b8631b5 MC |
1051 | if (transport->destroy_conn) |
1052 | transport->destroy_conn(conn); | |
7b8631b5 | 1053 | return 0; |
0896b752 AA |
1054 | } |
1055 | ||
fd7255f5 MC |
1056 | static int |
1057 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1058 | { | |
1059 | char *data = (char*)ev + sizeof(*ev); | |
1060 | struct iscsi_cls_conn *conn; | |
1061 | struct iscsi_cls_session *session; | |
a54a52ca | 1062 | int err = 0, value = 0; |
fd7255f5 MC |
1063 | |
1064 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1065 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1066 | if (!conn || !session) | |
1067 | return -EINVAL; | |
1068 | ||
1069 | switch (ev->u.set_param.param) { | |
30a6c652 | 1070 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1071 | sscanf(data, "%d", &value); |
30a6c652 MC |
1072 | if (value != 0) |
1073 | session->recovery_tmo = value; | |
1074 | break; | |
fd7255f5 | 1075 | default: |
a54a52ca MC |
1076 | err = transport->set_param(conn, ev->u.set_param.param, |
1077 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1078 | } |
1079 | ||
1080 | return err; | |
1081 | } | |
1082 | ||
264faaaa OG |
1083 | static int |
1084 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1085 | struct iscsi_uevent *ev, int msg_type) | |
1086 | { | |
1087 | struct sockaddr *dst_addr; | |
1088 | int rc = 0; | |
1089 | ||
1090 | switch (msg_type) { | |
1091 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1092 | if (!transport->ep_connect) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1096 | rc = transport->ep_connect(dst_addr, | |
1097 | ev->u.ep_connect.non_blocking, | |
1098 | &ev->r.ep_connect_ret.handle); | |
1099 | break; | |
1100 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1101 | if (!transport->ep_poll) | |
1102 | return -EINVAL; | |
1103 | ||
1104 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1105 | ev->u.ep_poll.timeout_ms); | |
1106 | break; | |
1107 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1108 | if (!transport->ep_disconnect) | |
1109 | return -EINVAL; | |
1110 | ||
1111 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1112 | break; | |
1113 | } | |
1114 | return rc; | |
1115 | } | |
1116 | ||
01cb225d MC |
1117 | static int |
1118 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1119 | struct iscsi_uevent *ev) | |
1120 | { | |
2174a04e | 1121 | struct Scsi_Host *shost; |
01cb225d | 1122 | struct sockaddr *dst_addr; |
2174a04e | 1123 | int err; |
01cb225d MC |
1124 | |
1125 | if (!transport->tgt_dscvr) | |
1126 | return -EINVAL; | |
1127 | ||
2174a04e MC |
1128 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
1129 | if (IS_ERR(shost)) { | |
1130 | printk(KERN_ERR "target discovery could not find host no %u\n", | |
1131 | ev->u.tgt_dscvr.host_no); | |
1132 | return -ENODEV; | |
1133 | } | |
1134 | ||
1135 | ||
01cb225d | 1136 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
2174a04e MC |
1137 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1138 | ev->u.tgt_dscvr.enable, dst_addr); | |
1139 | scsi_host_put(shost); | |
1140 | return err; | |
01cb225d MC |
1141 | } |
1142 | ||
1d9bf13a MC |
1143 | static int |
1144 | iscsi_set_host_param(struct iscsi_transport *transport, | |
1145 | struct iscsi_uevent *ev) | |
1146 | { | |
1147 | char *data = (char*)ev + sizeof(*ev); | |
1148 | struct Scsi_Host *shost; | |
1149 | int err; | |
1150 | ||
1151 | if (!transport->set_host_param) | |
1152 | return -ENOSYS; | |
1153 | ||
1154 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); | |
1155 | if (IS_ERR(shost)) { | |
1156 | printk(KERN_ERR "set_host_param could not find host no %u\n", | |
1157 | ev->u.set_host_param.host_no); | |
1158 | return -ENODEV; | |
1159 | } | |
1160 | ||
1161 | err = transport->set_host_param(shost, ev->u.set_host_param.param, | |
1162 | data, ev->u.set_host_param.len); | |
1163 | scsi_host_put(shost); | |
1164 | return err; | |
1165 | } | |
1166 | ||
0896b752 AA |
1167 | static int |
1168 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1169 | { | |
1170 | int err = 0; | |
1171 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1172 | struct iscsi_transport *transport = NULL; | |
1173 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1174 | struct iscsi_cls_session *session; |
1175 | struct iscsi_cls_conn *conn; | |
0896b752 | 1176 | |
0896b752 AA |
1177 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1178 | if (!priv) | |
1179 | return -EINVAL; | |
1180 | transport = priv->iscsi_transport; | |
1181 | ||
7b7232f3 MC |
1182 | if (!try_module_get(transport->owner)) |
1183 | return -EINVAL; | |
1184 | ||
790f39a2 MC |
1185 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1186 | ||
0896b752 AA |
1187 | switch (nlh->nlmsg_type) { |
1188 | case ISCSI_UEVENT_CREATE_SESSION: | |
1189 | err = iscsi_if_create_session(priv, ev); | |
1190 | break; | |
1191 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1192 | session = iscsi_session_lookup(ev->u.d_session.sid); |
26974789 | 1193 | if (session) |
7b7232f3 | 1194 | transport->destroy_session(session); |
26974789 MC |
1195 | else |
1196 | err = -EINVAL; | |
1197 | break; | |
1198 | case ISCSI_UEVENT_UNBIND_SESSION: | |
1199 | session = iscsi_session_lookup(ev->u.d_session.sid); | |
1200 | if (session) | |
1201 | iscsi_unbind_session(session); | |
1202 | else | |
7b7232f3 | 1203 | err = -EINVAL; |
0896b752 AA |
1204 | break; |
1205 | case ISCSI_UEVENT_CREATE_CONN: | |
1206 | err = iscsi_if_create_conn(transport, ev); | |
1207 | break; | |
1208 | case ISCSI_UEVENT_DESTROY_CONN: | |
1209 | err = iscsi_if_destroy_conn(transport, ev); | |
1210 | break; | |
1211 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1212 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1213 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1214 | |
1215 | if (session && conn) | |
1216 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1217 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1218 | ev->u.b_conn.is_leading); |
1219 | else | |
1220 | err = -EINVAL; | |
0896b752 AA |
1221 | break; |
1222 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1223 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1224 | break; |
1225 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1226 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1227 | if (conn) |
1228 | ev->r.retcode = transport->start_conn(conn); | |
1229 | else | |
1230 | err = -EINVAL; | |
0896b752 AA |
1231 | break; |
1232 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1233 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1234 | if (conn) |
1235 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1236 | else | |
1237 | err = -EINVAL; | |
0896b752 AA |
1238 | break; |
1239 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1240 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1241 | if (conn) |
1242 | ev->r.retcode = transport->send_pdu(conn, | |
1243 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1244 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1245 | ev->u.send_pdu.data_size); | |
1246 | else | |
1247 | err = -EINVAL; | |
0896b752 AA |
1248 | break; |
1249 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1250 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1251 | break; |
264faaaa OG |
1252 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1253 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1254 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1255 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1256 | break; | |
01cb225d MC |
1257 | case ISCSI_UEVENT_TGT_DSCVR: |
1258 | err = iscsi_tgt_dscvr(transport, ev); | |
1259 | break; | |
1d9bf13a MC |
1260 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1261 | err = iscsi_set_host_param(transport, ev); | |
1262 | break; | |
0896b752 | 1263 | default: |
1d9bf13a | 1264 | err = -ENOSYS; |
0896b752 AA |
1265 | break; |
1266 | } | |
1267 | ||
7b7232f3 | 1268 | module_put(transport->owner); |
0896b752 AA |
1269 | return err; |
1270 | } | |
1271 | ||
b5c7a12d | 1272 | /* |
cd40b7d3 DL |
1273 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1274 | * Malformed skbs with wrong lengths or invalid creds are not processed. | |
b5c7a12d | 1275 | */ |
0896b752 | 1276 | static void |
cd40b7d3 | 1277 | iscsi_if_rx(struct sk_buff *skb) |
0896b752 | 1278 | { |
0b950672 | 1279 | mutex_lock(&rx_queue_mutex); |
cd40b7d3 DL |
1280 | while (skb->len >= NLMSG_SPACE(0)) { |
1281 | int err; | |
1282 | uint32_t rlen; | |
1283 | struct nlmsghdr *nlh; | |
1284 | struct iscsi_uevent *ev; | |
1285 | ||
1286 | nlh = nlmsg_hdr(skb); | |
1287 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1288 | skb->len < nlh->nlmsg_len) { | |
1289 | break; | |
ee7f8e40 | 1290 | } |
ee7f8e40 | 1291 | |
cd40b7d3 DL |
1292 | ev = NLMSG_DATA(nlh); |
1293 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1294 | if (rlen > skb->len) | |
1295 | rlen = skb->len; | |
0896b752 | 1296 | |
cd40b7d3 DL |
1297 | err = iscsi_if_recv_msg(skb, nlh); |
1298 | if (err) { | |
1299 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1300 | ev->iferror = err; | |
0896b752 | 1301 | } |
cd40b7d3 DL |
1302 | do { |
1303 | /* | |
1304 | * special case for GET_STATS: | |
1305 | * on success - sending reply and stats from | |
1306 | * inside of if_recv_msg(), | |
1307 | * on error - fall through. | |
1308 | */ | |
1309 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1310 | break; | |
1311 | err = iscsi_if_send_reply( | |
1312 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1313 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
1314 | } while (err < 0 && err != -ECONNREFUSED); | |
1315 | skb_pull(skb, rlen); | |
0896b752 | 1316 | } |
0b950672 | 1317 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1318 | } |
1da177e4 | 1319 | |
7b8631b5 MC |
1320 | #define iscsi_cdev_to_conn(_cdev) \ |
1321 | iscsi_dev_to_conn(_cdev->dev) | |
1322 | ||
fd7255f5 MC |
1323 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1324 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1325 | __ATTR(_name,_mode,_show,_store) | |
1326 | ||
1da177e4 | 1327 | /* |
0896b752 | 1328 | * iSCSI connection attrs |
1da177e4 | 1329 | */ |
a54a52ca | 1330 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1331 | static ssize_t \ |
a54a52ca | 1332 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1333 | { \ |
7b8631b5 MC |
1334 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1335 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1336 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1337 | } |
1338 | ||
a54a52ca MC |
1339 | #define iscsi_conn_attr(field, param) \ |
1340 | iscsi_conn_attr_show(param) \ | |
1341 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1342 | NULL); |
0896b752 | 1343 | |
a54a52ca MC |
1344 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1345 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1346 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1347 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1348 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1349 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1350 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1351 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1352 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1353 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1354 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
f6d5180c MC |
1355 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1356 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); | |
1da177e4 | 1357 | |
7b8631b5 MC |
1358 | #define iscsi_cdev_to_session(_cdev) \ |
1359 | iscsi_dev_to_session(_cdev->dev) | |
1360 | ||
1da177e4 | 1361 | /* |
0896b752 | 1362 | * iSCSI session attrs |
1da177e4 | 1363 | */ |
b2c64167 | 1364 | #define iscsi_session_attr_show(param, perm) \ |
fd7255f5 | 1365 | static ssize_t \ |
a54a52ca | 1366 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1367 | { \ |
1368 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1369 | struct iscsi_transport *t = session->transport; \ | |
b2c64167 MC |
1370 | \ |
1371 | if (perm && !capable(CAP_SYS_ADMIN)) \ | |
1372 | return -EACCES; \ | |
a54a52ca | 1373 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1374 | } |
1375 | ||
b2c64167 MC |
1376 | #define iscsi_session_attr(field, param, perm) \ |
1377 | iscsi_session_attr_show(param, perm) \ | |
a54a52ca | 1378 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
fd7255f5 MC |
1379 | NULL); |
1380 | ||
b2c64167 MC |
1381 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1382 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); | |
1383 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); | |
1384 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); | |
1385 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); | |
1386 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); | |
1387 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); | |
1388 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); | |
1389 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); | |
1390 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); | |
1391 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); | |
1392 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); | |
1393 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); | |
1394 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); | |
4cd49ea1 MC |
1395 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1396 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); | |
1397 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); | |
1da177e4 | 1398 | |
6eabafbe MC |
1399 | static ssize_t |
1400 | show_priv_session_state(struct class_device *cdev, char *buf) | |
1401 | { | |
1402 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); | |
1403 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); | |
1404 | } | |
1405 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, | |
1406 | NULL); | |
1407 | ||
fd7255f5 MC |
1408 | #define iscsi_priv_session_attr_show(field, format) \ |
1409 | static ssize_t \ | |
a54a52ca | 1410 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1411 | { \ |
a54a52ca | 1412 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1413 | return sprintf(buf, format"\n", session->field); \ |
1414 | } | |
1415 | ||
1416 | #define iscsi_priv_session_attr(field, format) \ | |
1417 | iscsi_priv_session_attr_show(field, format) \ | |
1418 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1419 | NULL) | |
30a6c652 | 1420 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1421 | |
1819dc81 MC |
1422 | /* |
1423 | * iSCSI host attrs | |
1424 | */ | |
1425 | #define iscsi_host_attr_show(param) \ | |
1426 | static ssize_t \ | |
1427 | show_host_param_##param(struct class_device *cdev, char *buf) \ | |
1428 | { \ | |
1429 | struct Scsi_Host *shost = transport_class_to_shost(cdev); \ | |
1430 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ | |
1431 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ | |
1432 | } | |
1433 | ||
1434 | #define iscsi_host_attr(field, param) \ | |
1435 | iscsi_host_attr_show(param) \ | |
1436 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ | |
1437 | NULL); | |
1438 | ||
d8196ed2 | 1439 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1819dc81 | 1440 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
d8196ed2 | 1441 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
8ad5781a | 1442 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1819dc81 | 1443 | |
fd7255f5 MC |
1444 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1445 | do { \ | |
1446 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1447 | count++; \ | |
1448 | } while (0) | |
1449 | ||
a54a52ca | 1450 | |
fd7255f5 MC |
1451 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1452 | do { \ | |
1453 | if (tt->param_mask & param_flag) { \ | |
1454 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1455 | count++; \ |
fd7255f5 MC |
1456 | } \ |
1457 | } while (0) | |
1458 | ||
fd7255f5 MC |
1459 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1460 | do { \ | |
1461 | if (tt->param_mask & param_flag) { \ | |
1462 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1463 | count++; \ | |
1464 | } \ | |
1465 | } while (0) | |
1da177e4 | 1466 | |
1819dc81 MC |
1467 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1468 | do { \ | |
1469 | if (tt->host_param_mask & param_flag) { \ | |
1470 | priv->host_attrs[count] = &class_device_attr_host_##field; \ | |
1471 | count++; \ | |
1472 | } \ | |
1473 | } while (0) | |
1474 | ||
0896b752 AA |
1475 | static int iscsi_session_match(struct attribute_container *cont, |
1476 | struct device *dev) | |
1da177e4 | 1477 | { |
7b8631b5 | 1478 | struct iscsi_cls_session *session; |
1da177e4 | 1479 | struct Scsi_Host *shost; |
0896b752 AA |
1480 | struct iscsi_internal *priv; |
1481 | ||
1482 | if (!iscsi_is_session_dev(dev)) | |
1483 | return 0; | |
1da177e4 | 1484 | |
7b8631b5 MC |
1485 | session = iscsi_dev_to_session(dev); |
1486 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1487 | if (!shost->transportt) |
1da177e4 LT |
1488 | return 0; |
1489 | ||
0896b752 AA |
1490 | priv = to_iscsi_internal(shost->transportt); |
1491 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1492 | return 0; |
1493 | ||
0896b752 | 1494 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1495 | } |
1496 | ||
0896b752 AA |
1497 | static int iscsi_conn_match(struct attribute_container *cont, |
1498 | struct device *dev) | |
1499 | { | |
7b8631b5 MC |
1500 | struct iscsi_cls_session *session; |
1501 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1502 | struct Scsi_Host *shost; |
0896b752 | 1503 | struct iscsi_internal *priv; |
1da177e4 | 1504 | |
0896b752 | 1505 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1506 | return 0; |
1507 | ||
7b8631b5 MC |
1508 | conn = iscsi_dev_to_conn(dev); |
1509 | session = iscsi_dev_to_session(conn->dev.parent); | |
1510 | shost = iscsi_session_to_shost(session); | |
1511 | ||
0896b752 | 1512 | if (!shost->transportt) |
1da177e4 LT |
1513 | return 0; |
1514 | ||
0896b752 AA |
1515 | priv = to_iscsi_internal(shost->transportt); |
1516 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1517 | return 0; | |
1da177e4 | 1518 | |
0896b752 AA |
1519 | return &priv->conn_cont.ac == cont; |
1520 | } | |
1521 | ||
30a6c652 MC |
1522 | static int iscsi_host_match(struct attribute_container *cont, |
1523 | struct device *dev) | |
1524 | { | |
1525 | struct Scsi_Host *shost; | |
1526 | struct iscsi_internal *priv; | |
1527 | ||
1528 | if (!scsi_is_host_device(dev)) | |
1529 | return 0; | |
1530 | ||
1531 | shost = dev_to_shost(dev); | |
1532 | if (!shost->transportt || | |
1533 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1534 | return 0; | |
1535 | ||
1536 | priv = to_iscsi_internal(shost->transportt); | |
1537 | return &priv->t.host_attrs.ac == cont; | |
1538 | } | |
1539 | ||
7b8631b5 MC |
1540 | struct scsi_transport_template * |
1541 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1542 | { |
1543 | struct iscsi_internal *priv; | |
1544 | unsigned long flags; | |
1545 | int count = 0, err; | |
1546 | ||
1547 | BUG_ON(!tt); | |
1548 | ||
1549 | priv = iscsi_if_transport_lookup(tt); | |
1550 | if (priv) | |
7b8631b5 | 1551 | return NULL; |
0896b752 | 1552 | |
24669f75 | 1553 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1554 | if (!priv) |
7b8631b5 | 1555 | return NULL; |
0896b752 | 1556 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1557 | priv->daemon_pid = -1; |
0896b752 | 1558 | priv->iscsi_transport = tt; |
30a6c652 | 1559 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1560 | |
1561 | priv->cdev.class = &iscsi_transport_class; | |
1562 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1563 | err = class_device_register(&priv->cdev); | |
1564 | if (err) | |
1565 | goto free_priv; | |
1566 | ||
1567 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1568 | if (err) | |
1569 | goto unregister_cdev; | |
1570 | ||
30a6c652 MC |
1571 | /* host parameters */ |
1572 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1573 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1574 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1575 | priv->t.host_size = sizeof(struct iscsi_host); | |
30a6c652 MC |
1576 | transport_container_register(&priv->t.host_attrs); |
1577 | ||
d8196ed2 | 1578 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
22236961 | 1579 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1819dc81 | 1580 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
8ad5781a | 1581 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1819dc81 MC |
1582 | BUG_ON(count > ISCSI_HOST_ATTRS); |
1583 | priv->host_attrs[count] = NULL; | |
1584 | count = 0; | |
1585 | ||
0896b752 AA |
1586 | /* connection parameters */ |
1587 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1588 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1589 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1590 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1591 | |
fd7255f5 MC |
1592 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1593 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1594 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1595 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1596 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1597 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1598 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1599 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1600 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1601 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1602 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
f6d5180c MC |
1603 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
1604 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); | |
0896b752 AA |
1605 | |
1606 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1607 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1608 | count = 0; |
1da177e4 | 1609 | |
0896b752 AA |
1610 | /* session parameters */ |
1611 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1612 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1613 | priv->session_cont.ac.match = iscsi_session_match; | |
1614 | transport_container_register(&priv->session_cont); | |
1615 | ||
fd7255f5 MC |
1616 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1617 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1618 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1619 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1620 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1621 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1622 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1623 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1624 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1625 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
b2c64167 MC |
1626 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
1627 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); | |
1628 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); | |
1629 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); | |
843c0a8a | 1630 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
4cd49ea1 MC |
1631 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
1632 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); | |
30a6c652 | 1633 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
6eabafbe | 1634 | SETUP_PRIV_SESSION_RD_ATTR(state); |
fd7255f5 | 1635 | |
0896b752 AA |
1636 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1637 | priv->session_attrs[count] = NULL; | |
1638 | ||
1639 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1640 | list_add(&priv->list, &iscsi_transports); | |
1641 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1642 | ||
1643 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1644 | return &priv->t; |
1da177e4 | 1645 | |
0896b752 AA |
1646 | unregister_cdev: |
1647 | class_device_unregister(&priv->cdev); | |
1648 | free_priv: | |
1649 | kfree(priv); | |
7b8631b5 | 1650 | return NULL; |
1da177e4 | 1651 | } |
0896b752 AA |
1652 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1653 | ||
1654 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1655 | { | |
1656 | struct iscsi_internal *priv; | |
1657 | unsigned long flags; | |
1658 | ||
1659 | BUG_ON(!tt); | |
1660 | ||
0b950672 | 1661 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1662 | |
1663 | priv = iscsi_if_transport_lookup(tt); | |
1664 | BUG_ON (!priv); | |
1665 | ||
0896b752 AA |
1666 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1667 | list_del(&priv->list); | |
1668 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1669 | ||
1670 | transport_container_unregister(&priv->conn_cont); | |
1671 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1672 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1673 | |
1674 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1675 | class_device_unregister(&priv->cdev); | |
0b950672 | 1676 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1677 | |
0896b752 AA |
1678 | return 0; |
1679 | } | |
1680 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1681 | |
1da177e4 LT |
1682 | static __init int iscsi_transport_init(void) |
1683 | { | |
0896b752 | 1684 | int err; |
1da177e4 | 1685 | |
09492605 | 1686 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
f4246b33 MC |
1687 | ISCSI_TRANSPORT_VERSION); |
1688 | ||
41be1444 MC |
1689 | atomic_set(&iscsi_session_nr, 0); |
1690 | ||
0896b752 | 1691 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1692 | if (err) |
1693 | return err; | |
0896b752 | 1694 | |
30a6c652 | 1695 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1696 | if (err) |
1697 | goto unregister_transport_class; | |
1698 | ||
30a6c652 MC |
1699 | err = transport_class_register(&iscsi_connection_class); |
1700 | if (err) | |
1701 | goto unregister_host_class; | |
1702 | ||
0896b752 AA |
1703 | err = transport_class_register(&iscsi_session_class); |
1704 | if (err) | |
1705 | goto unregister_conn_class; | |
1706 | ||
b4b51029 | 1707 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, |
7b8631b5 | 1708 | THIS_MODULE); |
0896b752 AA |
1709 | if (!nls) { |
1710 | err = -ENOBUFS; | |
43a145a3 | 1711 | goto unregister_session_class; |
0896b752 AA |
1712 | } |
1713 | ||
d8bf541e MC |
1714 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
1715 | if (!iscsi_eh_timer_workq) | |
1716 | goto release_nls; | |
1717 | ||
43a145a3 | 1718 | return 0; |
0896b752 | 1719 | |
d8bf541e | 1720 | release_nls: |
b7c6ba6e | 1721 | netlink_kernel_release(nls); |
0896b752 AA |
1722 | unregister_session_class: |
1723 | transport_class_unregister(&iscsi_session_class); | |
1724 | unregister_conn_class: | |
1725 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1726 | unregister_host_class: |
1727 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1728 | unregister_transport_class: |
1729 | class_unregister(&iscsi_transport_class); | |
1730 | return err; | |
1da177e4 LT |
1731 | } |
1732 | ||
1733 | static void __exit iscsi_transport_exit(void) | |
1734 | { | |
d8bf541e | 1735 | destroy_workqueue(iscsi_eh_timer_workq); |
b7c6ba6e | 1736 | netlink_kernel_release(nls); |
0896b752 AA |
1737 | transport_class_unregister(&iscsi_connection_class); |
1738 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1739 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1740 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1741 | } |
1742 | ||
1743 | module_init(iscsi_transport_init); | |
1744 | module_exit(iscsi_transport_exit); | |
1745 | ||
0896b752 AA |
1746 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1747 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1748 | "Alex Aizman <itn780@yahoo.com>"); | |
1749 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1750 | MODULE_LICENSE("GPL"); |
f4246b33 | 1751 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |