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Commit | Line | Data |
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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 |
8d2860b3 | 34 | #define ISCSI_CONN_ATTRS 11 |
d8196ed2 | 35 | #define ISCSI_HOST_ATTRS 4 |
10396238 | 36 | #define ISCSI_TRANSPORT_VERSION "2.0-867" |
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); | |
26974789 MC |
130 | |
131 | snprintf(ihost->unbind_workq_name, KOBJ_NAME_LEN, "iscsi_unbind_%d", | |
132 | shost->host_no); | |
133 | ihost->unbind_workq = create_singlethread_workqueue( | |
134 | ihost->unbind_workq_name); | |
135 | if (!ihost->unbind_workq) | |
136 | return -ENOMEM; | |
137 | return 0; | |
138 | } | |
139 | ||
140 | static int iscsi_remove_host(struct transport_container *tc, struct device *dev, | |
141 | struct class_device *cdev) | |
142 | { | |
143 | struct Scsi_Host *shost = dev_to_shost(dev); | |
144 | struct iscsi_host *ihost = shost->shost_data; | |
145 | ||
146 | destroy_workqueue(ihost->unbind_workq); | |
30a6c652 MC |
147 | return 0; |
148 | } | |
149 | ||
150 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
151 | "iscsi_host", | |
152 | iscsi_setup_host, | |
26974789 | 153 | iscsi_remove_host, |
30a6c652 MC |
154 | NULL); |
155 | ||
0896b752 AA |
156 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
157 | "iscsi_session", | |
1da177e4 LT |
158 | NULL, |
159 | NULL, | |
160 | NULL); | |
161 | ||
0896b752 AA |
162 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
163 | "iscsi_connection", | |
1da177e4 LT |
164 | NULL, |
165 | NULL, | |
166 | NULL); | |
0896b752 AA |
167 | |
168 | static struct sock *nls; | |
0b950672 | 169 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 | 170 | |
7b7232f3 MC |
171 | static LIST_HEAD(sesslist); |
172 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
173 | static LIST_HEAD(connlist); |
174 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 175 | |
b5c7a12d MC |
176 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
177 | { | |
178 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
179 | return sess->sid; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Returns the matching session to a given sid | |
184 | */ | |
185 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
186 | { |
187 | unsigned long flags; | |
188 | struct iscsi_cls_session *sess; | |
189 | ||
190 | spin_lock_irqsave(&sesslock, flags); | |
191 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 192 | if (sess->sid == sid) { |
7b7232f3 MC |
193 | spin_unlock_irqrestore(&sesslock, flags); |
194 | return sess; | |
195 | } | |
196 | } | |
197 | spin_unlock_irqrestore(&sesslock, flags); | |
198 | return NULL; | |
199 | } | |
200 | ||
b5c7a12d MC |
201 | /* |
202 | * Returns the matching connection to a given sid / cid tuple | |
203 | */ | |
204 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
205 | { |
206 | unsigned long flags; | |
207 | struct iscsi_cls_conn *conn; | |
208 | ||
209 | spin_lock_irqsave(&connlock, flags); | |
210 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 211 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
212 | spin_unlock_irqrestore(&connlock, flags); |
213 | return conn; | |
214 | } | |
215 | } | |
216 | spin_unlock_irqrestore(&connlock, flags); | |
217 | return NULL; | |
218 | } | |
219 | ||
7b8631b5 MC |
220 | /* |
221 | * The following functions can be used by LLDs that allocate | |
222 | * their own scsi_hosts or by software iscsi LLDs | |
223 | */ | |
6eabafbe MC |
224 | static struct { |
225 | int value; | |
226 | char *name; | |
227 | } iscsi_session_state_names[] = { | |
228 | { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" }, | |
229 | { ISCSI_SESSION_FAILED, "FAILED" }, | |
230 | { ISCSI_SESSION_FREE, "FREE" }, | |
231 | }; | |
232 | ||
233 | const char *iscsi_session_state_name(int state) | |
234 | { | |
235 | int i; | |
236 | char *name = NULL; | |
237 | ||
238 | for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { | |
239 | if (iscsi_session_state_names[i].value == state) { | |
240 | name = iscsi_session_state_names[i].name; | |
241 | break; | |
242 | } | |
243 | } | |
244 | return name; | |
245 | } | |
246 | ||
247 | int iscsi_session_chkready(struct iscsi_cls_session *session) | |
248 | { | |
249 | unsigned long flags; | |
250 | int err; | |
251 | ||
252 | spin_lock_irqsave(&session->lock, flags); | |
253 | switch (session->state) { | |
254 | case ISCSI_SESSION_LOGGED_IN: | |
255 | err = 0; | |
256 | break; | |
257 | case ISCSI_SESSION_FAILED: | |
258 | err = DID_IMM_RETRY << 16; | |
259 | break; | |
260 | case ISCSI_SESSION_FREE: | |
261 | err = DID_NO_CONNECT << 16; | |
262 | break; | |
263 | default: | |
264 | err = DID_NO_CONNECT << 16; | |
265 | break; | |
266 | } | |
267 | spin_unlock_irqrestore(&session->lock, flags); | |
268 | return err; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(iscsi_session_chkready); | |
271 | ||
7b8631b5 MC |
272 | static void iscsi_session_release(struct device *dev) |
273 | { | |
274 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 275 | struct Scsi_Host *shost; |
0896b752 | 276 | |
7b8631b5 MC |
277 | shost = iscsi_session_to_shost(session); |
278 | scsi_host_put(shost); | |
279 | kfree(session); | |
7b8631b5 | 280 | } |
0896b752 | 281 | |
7b8631b5 MC |
282 | static int iscsi_is_session_dev(const struct device *dev) |
283 | { | |
284 | return dev->release == iscsi_session_release; | |
285 | } | |
0896b752 | 286 | |
30a6c652 MC |
287 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
288 | uint id, uint lun) | |
289 | { | |
290 | struct iscsi_host *ihost = shost->shost_data; | |
291 | struct iscsi_cls_session *session; | |
292 | ||
293 | mutex_lock(&ihost->mutex); | |
294 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
e6f3b63f | 295 | if ((channel == SCAN_WILD_CARD || channel == 0) && |
30a6c652 | 296 | (id == SCAN_WILD_CARD || id == session->target_id)) |
e6f3b63f | 297 | scsi_scan_target(&session->dev, 0, |
30a6c652 MC |
298 | session->target_id, lun, 1); |
299 | } | |
300 | mutex_unlock(&ihost->mutex); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
c4028958 | 305 | static void session_recovery_timedout(struct work_struct *work) |
30a6c652 | 306 | { |
c4028958 DH |
307 | struct iscsi_cls_session *session = |
308 | container_of(work, struct iscsi_cls_session, | |
309 | recovery_work.work); | |
6eabafbe | 310 | unsigned long flags; |
30a6c652 | 311 | |
be2df72e OG |
312 | dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
313 | "out after %d secs\n", session->recovery_tmo); | |
30a6c652 | 314 | |
6eabafbe MC |
315 | spin_lock_irqsave(&session->lock, flags); |
316 | switch (session->state) { | |
317 | case ISCSI_SESSION_FAILED: | |
318 | session->state = ISCSI_SESSION_FREE; | |
319 | break; | |
320 | case ISCSI_SESSION_LOGGED_IN: | |
321 | case ISCSI_SESSION_FREE: | |
322 | /* we raced with the unblock's flush */ | |
323 | spin_unlock_irqrestore(&session->lock, flags); | |
324 | return; | |
325 | } | |
326 | spin_unlock_irqrestore(&session->lock, flags); | |
327 | ||
30a6c652 MC |
328 | if (session->transport->session_recovery_timedout) |
329 | session->transport->session_recovery_timedout(session); | |
330 | ||
331 | scsi_target_unblock(&session->dev); | |
332 | } | |
333 | ||
6eabafbe | 334 | void __iscsi_unblock_session(struct iscsi_cls_session *session) |
30a6c652 MC |
335 | { |
336 | if (!cancel_delayed_work(&session->recovery_work)) | |
d8bf541e | 337 | flush_workqueue(iscsi_eh_timer_workq); |
30a6c652 MC |
338 | scsi_target_unblock(&session->dev); |
339 | } | |
6eabafbe MC |
340 | |
341 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
342 | { | |
343 | unsigned long flags; | |
344 | ||
345 | spin_lock_irqsave(&session->lock, flags); | |
346 | session->state = ISCSI_SESSION_LOGGED_IN; | |
347 | spin_unlock_irqrestore(&session->lock, flags); | |
348 | ||
349 | __iscsi_unblock_session(session); | |
350 | } | |
30a6c652 MC |
351 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
352 | ||
353 | void iscsi_block_session(struct iscsi_cls_session *session) | |
354 | { | |
6eabafbe MC |
355 | unsigned long flags; |
356 | ||
357 | spin_lock_irqsave(&session->lock, flags); | |
358 | session->state = ISCSI_SESSION_FAILED; | |
359 | spin_unlock_irqrestore(&session->lock, flags); | |
360 | ||
30a6c652 | 361 | scsi_target_block(&session->dev); |
d8bf541e MC |
362 | queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, |
363 | session->recovery_tmo * HZ); | |
30a6c652 MC |
364 | } |
365 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
366 | ||
26974789 MC |
367 | static void __iscsi_unbind_session(struct work_struct *work) |
368 | { | |
369 | struct iscsi_cls_session *session = | |
370 | container_of(work, struct iscsi_cls_session, | |
371 | unbind_work); | |
372 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
373 | struct iscsi_host *ihost = shost->shost_data; | |
374 | ||
375 | /* Prevent new scans and make sure scanning is not in progress */ | |
376 | mutex_lock(&ihost->mutex); | |
377 | if (list_empty(&session->host_list)) { | |
378 | mutex_unlock(&ihost->mutex); | |
379 | return; | |
380 | } | |
381 | list_del_init(&session->host_list); | |
382 | mutex_unlock(&ihost->mutex); | |
383 | ||
384 | scsi_remove_target(&session->dev); | |
385 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); | |
386 | } | |
387 | ||
388 | static int iscsi_unbind_session(struct iscsi_cls_session *session) | |
389 | { | |
390 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
391 | struct iscsi_host *ihost = shost->shost_data; | |
392 | ||
393 | return queue_work(ihost->unbind_workq, &session->unbind_work); | |
394 | } | |
395 | ||
7b8631b5 | 396 | struct iscsi_cls_session * |
8434aa8b MC |
397 | iscsi_alloc_session(struct Scsi_Host *shost, |
398 | struct iscsi_transport *transport) | |
7b8631b5 MC |
399 | { |
400 | struct iscsi_cls_session *session; | |
7b8631b5 | 401 | |
b5c7a12d MC |
402 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
403 | GFP_KERNEL); | |
7b8631b5 | 404 | if (!session) |
f53a88da MC |
405 | return NULL; |
406 | ||
7b8631b5 | 407 | session->transport = transport; |
30a6c652 | 408 | session->recovery_tmo = 120; |
6eabafbe | 409 | session->state = ISCSI_SESSION_FREE; |
c4028958 | 410 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
30a6c652 MC |
411 | INIT_LIST_HEAD(&session->host_list); |
412 | INIT_LIST_HEAD(&session->sess_list); | |
26974789 | 413 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
6eabafbe | 414 | spin_lock_init(&session->lock); |
7b8631b5 | 415 | |
6a8a0d36 MC |
416 | /* this is released in the dev's release function */ |
417 | scsi_host_get(shost); | |
8434aa8b MC |
418 | session->dev.parent = &shost->shost_gendev; |
419 | session->dev.release = iscsi_session_release; | |
420 | device_initialize(&session->dev); | |
b5c7a12d MC |
421 | if (transport->sessiondata_size) |
422 | session->dd_data = &session[1]; | |
8434aa8b MC |
423 | return session; |
424 | } | |
425 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
426 | ||
6a8a0d36 | 427 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
428 | { |
429 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
430 | struct iscsi_host *ihost; | |
26974789 | 431 | unsigned long flags; |
8434aa8b | 432 | int err; |
b5c7a12d | 433 | |
30a6c652 | 434 | ihost = shost->shost_data; |
41be1444 | 435 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
6a8a0d36 | 436 | session->target_id = target_id; |
30a6c652 | 437 | |
b5c7a12d MC |
438 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
439 | session->sid); | |
8434aa8b | 440 | err = device_add(&session->dev); |
7b8631b5 MC |
441 | if (err) { |
442 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
443 | "register session's dev\n"); | |
8434aa8b | 444 | goto release_host; |
7b8631b5 MC |
445 | } |
446 | transport_register_device(&session->dev); | |
447 | ||
26974789 MC |
448 | spin_lock_irqsave(&sesslock, flags); |
449 | list_add(&session->sess_list, &sesslist); | |
450 | spin_unlock_irqrestore(&sesslock, flags); | |
451 | ||
30a6c652 MC |
452 | mutex_lock(&ihost->mutex); |
453 | list_add(&session->host_list, &ihost->sessions); | |
454 | mutex_unlock(&ihost->mutex); | |
26974789 MC |
455 | |
456 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); | |
8434aa8b | 457 | return 0; |
30a6c652 | 458 | |
8434aa8b MC |
459 | release_host: |
460 | scsi_host_put(shost); | |
461 | return err; | |
7b8631b5 | 462 | } |
8434aa8b | 463 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
464 | |
465 | /** | |
8434aa8b MC |
466 | * iscsi_create_session - create iscsi class session |
467 | * @shost: scsi host | |
468 | * @transport: iscsi transport | |
eb44820c | 469 | * @target_id: which target |
7b8631b5 | 470 | * |
8434aa8b | 471 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 472 | */ |
8434aa8b MC |
473 | struct iscsi_cls_session * |
474 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
475 | struct iscsi_transport *transport, |
476 | unsigned int target_id) | |
8434aa8b MC |
477 | { |
478 | struct iscsi_cls_session *session; | |
479 | ||
480 | session = iscsi_alloc_session(shost, transport); | |
481 | if (!session) | |
482 | return NULL; | |
483 | ||
6a8a0d36 | 484 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
485 | iscsi_free_session(session); |
486 | return NULL; | |
487 | } | |
488 | return session; | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
491 | ||
26974789 MC |
492 | static void iscsi_conn_release(struct device *dev) |
493 | { | |
494 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
495 | struct device *parent = conn->dev.parent; | |
496 | ||
497 | kfree(conn); | |
498 | put_device(parent); | |
499 | } | |
500 | ||
501 | static int iscsi_is_conn_dev(const struct device *dev) | |
502 | { | |
503 | return dev->release == iscsi_conn_release; | |
504 | } | |
505 | ||
506 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) | |
507 | { | |
508 | if (!iscsi_is_conn_dev(dev)) | |
509 | return 0; | |
510 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); | |
511 | } | |
512 | ||
8434aa8b | 513 | void iscsi_remove_session(struct iscsi_cls_session *session) |
7b8631b5 | 514 | { |
30a6c652 MC |
515 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
516 | struct iscsi_host *ihost = shost->shost_data; | |
26974789 MC |
517 | unsigned long flags; |
518 | int err; | |
519 | ||
520 | spin_lock_irqsave(&sesslock, flags); | |
521 | list_del(&session->sess_list); | |
522 | spin_unlock_irqrestore(&sesslock, flags); | |
30a6c652 | 523 | |
26974789 MC |
524 | /* |
525 | * If we are blocked let commands flow again. The lld or iscsi | |
526 | * layer should set up the queuecommand to fail commands. | |
527 | */ | |
6eabafbe MC |
528 | spin_lock_irqsave(&session->lock, flags); |
529 | session->state = ISCSI_SESSION_FREE; | |
530 | spin_unlock_irqrestore(&session->lock, flags); | |
531 | __iscsi_unblock_session(session); | |
26974789 MC |
532 | iscsi_unbind_session(session); |
533 | /* | |
534 | * If the session dropped while removing devices then we need to make | |
535 | * sure it is not blocked | |
536 | */ | |
30a6c652 | 537 | if (!cancel_delayed_work(&session->recovery_work)) |
d8bf541e | 538 | flush_workqueue(iscsi_eh_timer_workq); |
26974789 | 539 | flush_workqueue(ihost->unbind_workq); |
30a6c652 | 540 | |
26974789 MC |
541 | /* hw iscsi may not have removed all connections from session */ |
542 | err = device_for_each_child(&session->dev, NULL, | |
543 | iscsi_iter_destroy_conn_fn); | |
544 | if (err) | |
545 | dev_printk(KERN_ERR, &session->dev, "iscsi: Could not delete " | |
546 | "all connections for session. Error %d.\n", err); | |
8434aa8b | 547 | |
7b8631b5 | 548 | transport_unregister_device(&session->dev); |
8434aa8b MC |
549 | device_del(&session->dev); |
550 | } | |
551 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
552 | ||
553 | void iscsi_free_session(struct iscsi_cls_session *session) | |
554 | { | |
26974789 | 555 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
8434aa8b | 556 | put_device(&session->dev); |
7b8631b5 | 557 | } |
8434aa8b MC |
558 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
559 | ||
560 | /** | |
561 | * iscsi_destroy_session - destroy iscsi session | |
562 | * @session: iscsi_session | |
563 | * | |
564 | * Can be called by a LLD or iscsi_transport. There must not be | |
565 | * any running connections. | |
eb44820c | 566 | */ |
8434aa8b MC |
567 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
568 | { | |
569 | iscsi_remove_session(session); | |
570 | iscsi_free_session(session); | |
571 | return 0; | |
572 | } | |
7b8631b5 MC |
573 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
574 | ||
7b8631b5 MC |
575 | /** |
576 | * iscsi_create_conn - create iscsi class connection | |
577 | * @session: iscsi cls session | |
578 | * @cid: connection id | |
579 | * | |
580 | * This can be called from a LLD or iscsi_transport. The connection | |
581 | * is child of the session so cid must be unique for all connections | |
582 | * on the session. | |
b5c7a12d MC |
583 | * |
584 | * Since we do not support MCS, cid will normally be zero. In some cases | |
585 | * for software iscsi we could be trying to preallocate a connection struct | |
586 | * in which case there could be two connection structs and cid would be | |
587 | * non-zero. | |
eb44820c | 588 | */ |
7b8631b5 MC |
589 | struct iscsi_cls_conn * |
590 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
591 | { | |
592 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 | 593 | struct iscsi_cls_conn *conn; |
26974789 | 594 | unsigned long flags; |
7b8631b5 MC |
595 | int err; |
596 | ||
597 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
598 | if (!conn) | |
599 | return NULL; | |
600 | ||
601 | if (transport->conndata_size) | |
602 | conn->dd_data = &conn[1]; | |
603 | ||
604 | INIT_LIST_HEAD(&conn->conn_list); | |
605 | conn->transport = transport; | |
b5c7a12d | 606 | conn->cid = cid; |
7b8631b5 MC |
607 | |
608 | /* this is released in the dev's release function */ | |
609 | if (!get_device(&session->dev)) | |
43a145a3 | 610 | goto free_conn; |
b5c7a12d | 611 | |
7b8631b5 | 612 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 613 | session->sid, cid); |
7b8631b5 MC |
614 | conn->dev.parent = &session->dev; |
615 | conn->dev.release = iscsi_conn_release; | |
616 | err = device_register(&conn->dev); | |
617 | if (err) { | |
618 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
619 | "connection's dev\n"); | |
620 | goto release_parent_ref; | |
621 | } | |
622 | transport_register_device(&conn->dev); | |
26974789 MC |
623 | |
624 | spin_lock_irqsave(&connlock, flags); | |
625 | list_add(&conn->conn_list, &connlist); | |
626 | conn->active = 1; | |
627 | spin_unlock_irqrestore(&connlock, flags); | |
7b8631b5 MC |
628 | return conn; |
629 | ||
630 | release_parent_ref: | |
631 | put_device(&session->dev); | |
632 | free_conn: | |
633 | kfree(conn); | |
634 | return NULL; | |
635 | } | |
636 | ||
637 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
638 | ||
639 | /** | |
640 | * iscsi_destroy_conn - destroy iscsi class connection | |
eb44820c | 641 | * @conn: iscsi cls session |
7b8631b5 | 642 | * |
26974789 | 643 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 644 | */ |
7b8631b5 MC |
645 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
646 | { | |
26974789 MC |
647 | unsigned long flags; |
648 | ||
649 | spin_lock_irqsave(&connlock, flags); | |
650 | conn->active = 0; | |
651 | list_del(&conn->conn_list); | |
652 | spin_unlock_irqrestore(&connlock, flags); | |
653 | ||
7b8631b5 MC |
654 | transport_unregister_device(&conn->dev); |
655 | device_unregister(&conn->dev); | |
656 | return 0; | |
657 | } | |
7b8631b5 MC |
658 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
659 | ||
7b8631b5 MC |
660 | /* |
661 | * iscsi interface functions | |
662 | */ | |
0896b752 AA |
663 | static struct iscsi_internal * |
664 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
665 | { | |
666 | struct iscsi_internal *priv; | |
667 | unsigned long flags; | |
668 | ||
669 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
670 | list_for_each_entry(priv, &iscsi_transports, list) { | |
671 | if (tt == priv->iscsi_transport) { | |
672 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
673 | return priv; | |
674 | } | |
675 | } | |
676 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
677 | return NULL; | |
678 | } | |
1da177e4 | 679 | |
53cb8a1f | 680 | static int |
43a145a3 | 681 | iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) |
53cb8a1f | 682 | { |
53cb8a1f MC |
683 | int rc; |
684 | ||
9aaa2b46 | 685 | rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
53cb8a1f | 686 | if (rc < 0) { |
53cb8a1f MC |
687 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); |
688 | return rc; | |
689 | } | |
690 | ||
53cb8a1f MC |
691 | return 0; |
692 | } | |
693 | ||
0896b752 | 694 | static int |
43a145a3 | 695 | iscsi_unicast_skb(struct sk_buff *skb, int pid) |
0896b752 | 696 | { |
0896b752 | 697 | int rc; |
1da177e4 | 698 | |
790f39a2 | 699 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 | 700 | if (rc < 0) { |
0896b752 AA |
701 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
702 | return rc; | |
703 | } | |
704 | ||
0896b752 | 705 | return 0; |
1da177e4 | 706 | } |
1da177e4 | 707 | |
7b7232f3 | 708 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 709 | char *data, uint32_t data_size) |
1da177e4 | 710 | { |
0896b752 AA |
711 | struct nlmsghdr *nlh; |
712 | struct sk_buff *skb; | |
713 | struct iscsi_uevent *ev; | |
0896b752 | 714 | char *pdu; |
790f39a2 | 715 | struct iscsi_internal *priv; |
0896b752 AA |
716 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
717 | data_size); | |
718 | ||
790f39a2 MC |
719 | priv = iscsi_if_transport_lookup(conn->transport); |
720 | if (!priv) | |
721 | return -EINVAL; | |
722 | ||
43a145a3 | 723 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 724 | if (!skb) { |
7b7232f3 | 725 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
726 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
727 | "control PDU: OOM\n"); | |
0896b752 AA |
728 | return -ENOMEM; |
729 | } | |
1da177e4 | 730 | |
790f39a2 | 731 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
732 | ev = NLMSG_DATA(nlh); |
733 | memset(ev, 0, sizeof(*ev)); | |
734 | ev->transport_handle = iscsi_handle(conn->transport); | |
735 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
b5c7a12d MC |
736 | ev->r.recv_req.cid = conn->cid; |
737 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
738 | pdu = (char*)ev + sizeof(*ev); |
739 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
740 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 741 | |
43a145a3 | 742 | return iscsi_unicast_skb(skb, priv->daemon_pid); |
1da177e4 | 743 | } |
0896b752 | 744 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 745 | |
7b7232f3 | 746 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 747 | { |
6eabafbe | 748 | struct iscsi_cls_session *session = iscsi_conn_to_session(conn); |
0896b752 AA |
749 | struct nlmsghdr *nlh; |
750 | struct sk_buff *skb; | |
751 | struct iscsi_uevent *ev; | |
790f39a2 | 752 | struct iscsi_internal *priv; |
0896b752 | 753 | int len = NLMSG_SPACE(sizeof(*ev)); |
6eabafbe | 754 | unsigned long flags; |
0896b752 | 755 | |
790f39a2 MC |
756 | priv = iscsi_if_transport_lookup(conn->transport); |
757 | if (!priv) | |
758 | return; | |
759 | ||
6eabafbe MC |
760 | spin_lock_irqsave(&session->lock, flags); |
761 | if (session->state == ISCSI_SESSION_LOGGED_IN) | |
762 | session->state = ISCSI_SESSION_FAILED; | |
763 | spin_unlock_irqrestore(&session->lock, flags); | |
764 | ||
43a145a3 | 765 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 766 | if (!skb) { |
7b8631b5 MC |
767 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
768 | "conn error (%d)\n", error); | |
0896b752 AA |
769 | return; |
770 | } | |
771 | ||
790f39a2 | 772 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
773 | ev = NLMSG_DATA(nlh); |
774 | ev->transport_handle = iscsi_handle(conn->transport); | |
775 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
0896b752 | 776 | ev->r.connerror.error = error; |
b5c7a12d MC |
777 | ev->r.connerror.cid = conn->cid; |
778 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 779 | |
43a145a3 | 780 | iscsi_broadcast_skb(skb, GFP_ATOMIC); |
1da177e4 | 781 | |
7b8631b5 MC |
782 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
783 | error); | |
0896b752 AA |
784 | } |
785 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
786 | ||
787 | static int | |
788 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
789 | void *payload, int size) | |
790 | { | |
791 | struct sk_buff *skb; | |
792 | struct nlmsghdr *nlh; | |
793 | int len = NLMSG_SPACE(size); | |
794 | int flags = multi ? NLM_F_MULTI : 0; | |
795 | int t = done ? NLMSG_DONE : type; | |
796 | ||
43a145a3 | 797 | skb = alloc_skb(len, GFP_ATOMIC); |
239a7dc2 MC |
798 | if (!skb) { |
799 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); | |
800 | return -ENOMEM; | |
801 | } | |
0896b752 AA |
802 | |
803 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
804 | nlh->nlmsg_flags = flags; | |
805 | memcpy(NLMSG_DATA(nlh), payload, size); | |
43a145a3 | 806 | return iscsi_unicast_skb(skb, pid); |
1da177e4 | 807 | } |
1da177e4 | 808 | |
7b8631b5 | 809 | static int |
5b940adf | 810 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
811 | { |
812 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
813 | struct iscsi_stats *stats; | |
814 | struct sk_buff *skbstat; | |
815 | struct iscsi_cls_conn *conn; | |
816 | struct nlmsghdr *nlhstat; | |
817 | struct iscsi_uevent *evstat; | |
790f39a2 | 818 | struct iscsi_internal *priv; |
7b8631b5 MC |
819 | int len = NLMSG_SPACE(sizeof(*ev) + |
820 | sizeof(struct iscsi_stats) + | |
821 | sizeof(struct iscsi_stats_custom) * | |
822 | ISCSI_STATS_CUSTOM_MAX); | |
823 | int err = 0; | |
0896b752 | 824 | |
790f39a2 MC |
825 | priv = iscsi_if_transport_lookup(transport); |
826 | if (!priv) | |
827 | return -EINVAL; | |
828 | ||
b5c7a12d | 829 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
830 | if (!conn) |
831 | return -EEXIST; | |
0896b752 | 832 | |
7b8631b5 MC |
833 | do { |
834 | int actual_size; | |
0896b752 | 835 | |
43a145a3 | 836 | skbstat = alloc_skb(len, GFP_ATOMIC); |
7b8631b5 MC |
837 | if (!skbstat) { |
838 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
839 | "deliver stats: OOM\n"); | |
840 | return -ENOMEM; | |
841 | } | |
842 | ||
790f39a2 | 843 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
844 | (len - sizeof(*nlhstat)), 0); |
845 | evstat = NLMSG_DATA(nlhstat); | |
846 | memset(evstat, 0, sizeof(*evstat)); | |
847 | evstat->transport_handle = iscsi_handle(conn->transport); | |
848 | evstat->type = nlh->nlmsg_type; | |
b5c7a12d MC |
849 | evstat->u.get_stats.cid = |
850 | ev->u.get_stats.cid; | |
851 | evstat->u.get_stats.sid = | |
852 | ev->u.get_stats.sid; | |
7b8631b5 MC |
853 | stats = (struct iscsi_stats *) |
854 | ((char*)evstat + sizeof(*evstat)); | |
855 | memset(stats, 0, sizeof(*stats)); | |
856 | ||
7b7232f3 | 857 | transport->get_stats(conn, stats); |
7b8631b5 MC |
858 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
859 | sizeof(struct iscsi_stats) + | |
860 | sizeof(struct iscsi_stats_custom) * | |
861 | stats->custom_length); | |
862 | actual_size -= sizeof(*nlhstat); | |
863 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 864 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
865 | nlhstat->nlmsg_len = actual_size; |
866 | ||
43a145a3 | 867 | err = iscsi_unicast_skb(skbstat, priv->daemon_pid); |
7b8631b5 MC |
868 | } while (err < 0 && err != -ECONNREFUSED); |
869 | ||
870 | return err; | |
0896b752 AA |
871 | } |
872 | ||
53cb8a1f | 873 | /** |
26974789 MC |
874 | * iscsi_session_event - send session destr. completion event |
875 | * @session: iscsi class session | |
876 | * @event: type of event | |
eb44820c | 877 | */ |
26974789 MC |
878 | int iscsi_session_event(struct iscsi_cls_session *session, |
879 | enum iscsi_uevent_e event) | |
53cb8a1f MC |
880 | { |
881 | struct iscsi_internal *priv; | |
53cb8a1f MC |
882 | struct Scsi_Host *shost; |
883 | struct iscsi_uevent *ev; | |
884 | struct sk_buff *skb; | |
885 | struct nlmsghdr *nlh; | |
53cb8a1f MC |
886 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
887 | ||
26974789 | 888 | priv = iscsi_if_transport_lookup(session->transport); |
53cb8a1f MC |
889 | if (!priv) |
890 | return -EINVAL; | |
53cb8a1f MC |
891 | shost = iscsi_session_to_shost(session); |
892 | ||
43a145a3 | 893 | skb = alloc_skb(len, GFP_KERNEL); |
53cb8a1f | 894 | if (!skb) { |
26974789 MC |
895 | dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " |
896 | "of session event %u\n", event); | |
53cb8a1f MC |
897 | return -ENOMEM; |
898 | } | |
899 | ||
900 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
901 | ev = NLMSG_DATA(nlh); | |
26974789 | 902 | ev->transport_handle = iscsi_handle(session->transport); |
53cb8a1f | 903 | |
26974789 MC |
904 | ev->type = event; |
905 | switch (event) { | |
906 | case ISCSI_KEVENT_DESTROY_SESSION: | |
907 | ev->r.d_session.host_no = shost->host_no; | |
908 | ev->r.d_session.sid = session->sid; | |
909 | break; | |
910 | case ISCSI_KEVENT_CREATE_SESSION: | |
911 | ev->r.c_session_ret.host_no = shost->host_no; | |
912 | ev->r.c_session_ret.sid = session->sid; | |
913 | break; | |
914 | case ISCSI_KEVENT_UNBIND_SESSION: | |
915 | ev->r.unbind_session.host_no = shost->host_no; | |
916 | ev->r.unbind_session.sid = session->sid; | |
917 | break; | |
918 | default: | |
919 | dev_printk(KERN_ERR, &session->dev, "Invalid event %u.\n", | |
920 | event); | |
921 | kfree_skb(skb); | |
53cb8a1f | 922 | return -EINVAL; |
53cb8a1f MC |
923 | } |
924 | ||
53cb8a1f MC |
925 | /* |
926 | * this will occur if the daemon is not up, so we just warn | |
927 | * the user and when the daemon is restarted it will handle it | |
928 | */ | |
43a145a3 | 929 | rc = iscsi_broadcast_skb(skb, GFP_KERNEL); |
53cb8a1f | 930 | if (rc < 0) |
26974789 MC |
931 | dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " |
932 | "of session event %u. Check iscsi daemon\n", event); | |
53cb8a1f MC |
933 | return rc; |
934 | } | |
26974789 | 935 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
53cb8a1f | 936 | |
0896b752 AA |
937 | static int |
938 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
939 | { | |
940 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 941 | struct iscsi_cls_session *session; |
b5c7a12d | 942 | uint32_t hostno; |
0896b752 | 943 | |
7996a778 | 944 | session = transport->create_session(transport, &priv->t, |
1548271e MC |
945 | ev->u.c_session.cmds_max, |
946 | ev->u.c_session.queue_depth, | |
7b7232f3 | 947 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 948 | &hostno); |
7b7232f3 | 949 | if (!session) |
7b8631b5 | 950 | return -ENOMEM; |
0896b752 | 951 | |
b5c7a12d MC |
952 | ev->r.c_session_ret.host_no = hostno; |
953 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 954 | return 0; |
0896b752 AA |
955 | } |
956 | ||
957 | static int | |
7b7232f3 | 958 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 959 | { |
7b8631b5 | 960 | struct iscsi_cls_conn *conn; |
7b7232f3 | 961 | struct iscsi_cls_session *session; |
7b8631b5 | 962 | |
b5c7a12d MC |
963 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
964 | if (!session) { | |
965 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
966 | ev->u.c_conn.sid); | |
7b8631b5 | 967 | return -EINVAL; |
b5c7a12d | 968 | } |
0896b752 | 969 | |
7b7232f3 | 970 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
971 | if (!conn) { |
972 | printk(KERN_ERR "iscsi: couldn't create a new " | |
973 | "connection for session %d\n", | |
974 | session->sid); | |
7b7232f3 | 975 | return -ENOMEM; |
b5c7a12d | 976 | } |
0896b752 | 977 | |
b5c7a12d MC |
978 | ev->r.c_conn_ret.sid = session->sid; |
979 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 | 980 | return 0; |
1da177e4 LT |
981 | } |
982 | ||
0896b752 AA |
983 | static int |
984 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
985 | { | |
7b8631b5 | 986 | struct iscsi_cls_conn *conn; |
0896b752 | 987 | |
b5c7a12d | 988 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 989 | if (!conn) |
7b8631b5 | 990 | return -EINVAL; |
0896b752 | 991 | |
7b8631b5 MC |
992 | if (transport->destroy_conn) |
993 | transport->destroy_conn(conn); | |
7b8631b5 | 994 | return 0; |
0896b752 AA |
995 | } |
996 | ||
fd7255f5 MC |
997 | static int |
998 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
999 | { | |
1000 | char *data = (char*)ev + sizeof(*ev); | |
1001 | struct iscsi_cls_conn *conn; | |
1002 | struct iscsi_cls_session *session; | |
a54a52ca | 1003 | int err = 0, value = 0; |
fd7255f5 MC |
1004 | |
1005 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1006 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1007 | if (!conn || !session) | |
1008 | return -EINVAL; | |
1009 | ||
1010 | switch (ev->u.set_param.param) { | |
30a6c652 | 1011 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1012 | sscanf(data, "%d", &value); |
30a6c652 MC |
1013 | if (value != 0) |
1014 | session->recovery_tmo = value; | |
1015 | break; | |
fd7255f5 | 1016 | default: |
a54a52ca MC |
1017 | err = transport->set_param(conn, ev->u.set_param.param, |
1018 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1019 | } |
1020 | ||
1021 | return err; | |
1022 | } | |
1023 | ||
264faaaa OG |
1024 | static int |
1025 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1026 | struct iscsi_uevent *ev, int msg_type) | |
1027 | { | |
1028 | struct sockaddr *dst_addr; | |
1029 | int rc = 0; | |
1030 | ||
1031 | switch (msg_type) { | |
1032 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1033 | if (!transport->ep_connect) | |
1034 | return -EINVAL; | |
1035 | ||
1036 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1037 | rc = transport->ep_connect(dst_addr, | |
1038 | ev->u.ep_connect.non_blocking, | |
1039 | &ev->r.ep_connect_ret.handle); | |
1040 | break; | |
1041 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1042 | if (!transport->ep_poll) | |
1043 | return -EINVAL; | |
1044 | ||
1045 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1046 | ev->u.ep_poll.timeout_ms); | |
1047 | break; | |
1048 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1049 | if (!transport->ep_disconnect) | |
1050 | return -EINVAL; | |
1051 | ||
1052 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1053 | break; | |
1054 | } | |
1055 | return rc; | |
1056 | } | |
1057 | ||
01cb225d MC |
1058 | static int |
1059 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1060 | struct iscsi_uevent *ev) | |
1061 | { | |
2174a04e | 1062 | struct Scsi_Host *shost; |
01cb225d | 1063 | struct sockaddr *dst_addr; |
2174a04e | 1064 | int err; |
01cb225d MC |
1065 | |
1066 | if (!transport->tgt_dscvr) | |
1067 | return -EINVAL; | |
1068 | ||
2174a04e MC |
1069 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
1070 | if (IS_ERR(shost)) { | |
1071 | printk(KERN_ERR "target discovery could not find host no %u\n", | |
1072 | ev->u.tgt_dscvr.host_no); | |
1073 | return -ENODEV; | |
1074 | } | |
1075 | ||
1076 | ||
01cb225d | 1077 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
2174a04e MC |
1078 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1079 | ev->u.tgt_dscvr.enable, dst_addr); | |
1080 | scsi_host_put(shost); | |
1081 | return err; | |
01cb225d MC |
1082 | } |
1083 | ||
1d9bf13a MC |
1084 | static int |
1085 | iscsi_set_host_param(struct iscsi_transport *transport, | |
1086 | struct iscsi_uevent *ev) | |
1087 | { | |
1088 | char *data = (char*)ev + sizeof(*ev); | |
1089 | struct Scsi_Host *shost; | |
1090 | int err; | |
1091 | ||
1092 | if (!transport->set_host_param) | |
1093 | return -ENOSYS; | |
1094 | ||
1095 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); | |
1096 | if (IS_ERR(shost)) { | |
1097 | printk(KERN_ERR "set_host_param could not find host no %u\n", | |
1098 | ev->u.set_host_param.host_no); | |
1099 | return -ENODEV; | |
1100 | } | |
1101 | ||
1102 | err = transport->set_host_param(shost, ev->u.set_host_param.param, | |
1103 | data, ev->u.set_host_param.len); | |
1104 | scsi_host_put(shost); | |
1105 | return err; | |
1106 | } | |
1107 | ||
0896b752 AA |
1108 | static int |
1109 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1110 | { | |
1111 | int err = 0; | |
1112 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1113 | struct iscsi_transport *transport = NULL; | |
1114 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1115 | struct iscsi_cls_session *session; |
1116 | struct iscsi_cls_conn *conn; | |
0896b752 | 1117 | |
0896b752 AA |
1118 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1119 | if (!priv) | |
1120 | return -EINVAL; | |
1121 | transport = priv->iscsi_transport; | |
1122 | ||
7b7232f3 MC |
1123 | if (!try_module_get(transport->owner)) |
1124 | return -EINVAL; | |
1125 | ||
790f39a2 MC |
1126 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1127 | ||
0896b752 AA |
1128 | switch (nlh->nlmsg_type) { |
1129 | case ISCSI_UEVENT_CREATE_SESSION: | |
1130 | err = iscsi_if_create_session(priv, ev); | |
1131 | break; | |
1132 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1133 | session = iscsi_session_lookup(ev->u.d_session.sid); |
26974789 | 1134 | if (session) |
7b7232f3 | 1135 | transport->destroy_session(session); |
26974789 MC |
1136 | else |
1137 | err = -EINVAL; | |
1138 | break; | |
1139 | case ISCSI_UEVENT_UNBIND_SESSION: | |
1140 | session = iscsi_session_lookup(ev->u.d_session.sid); | |
1141 | if (session) | |
1142 | iscsi_unbind_session(session); | |
1143 | else | |
7b7232f3 | 1144 | err = -EINVAL; |
0896b752 AA |
1145 | break; |
1146 | case ISCSI_UEVENT_CREATE_CONN: | |
1147 | err = iscsi_if_create_conn(transport, ev); | |
1148 | break; | |
1149 | case ISCSI_UEVENT_DESTROY_CONN: | |
1150 | err = iscsi_if_destroy_conn(transport, ev); | |
1151 | break; | |
1152 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1153 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1154 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1155 | |
1156 | if (session && conn) | |
1157 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1158 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1159 | ev->u.b_conn.is_leading); |
1160 | else | |
1161 | err = -EINVAL; | |
0896b752 AA |
1162 | break; |
1163 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1164 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1165 | break; |
1166 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1167 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1168 | if (conn) |
1169 | ev->r.retcode = transport->start_conn(conn); | |
1170 | else | |
1171 | err = -EINVAL; | |
0896b752 AA |
1172 | break; |
1173 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1174 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1175 | if (conn) |
1176 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1177 | else | |
1178 | err = -EINVAL; | |
0896b752 AA |
1179 | break; |
1180 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1181 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1182 | if (conn) |
1183 | ev->r.retcode = transport->send_pdu(conn, | |
1184 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1185 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1186 | ev->u.send_pdu.data_size); | |
1187 | else | |
1188 | err = -EINVAL; | |
0896b752 AA |
1189 | break; |
1190 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1191 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1192 | break; |
264faaaa OG |
1193 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1194 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1195 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1196 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1197 | break; | |
01cb225d MC |
1198 | case ISCSI_UEVENT_TGT_DSCVR: |
1199 | err = iscsi_tgt_dscvr(transport, ev); | |
1200 | break; | |
1d9bf13a MC |
1201 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1202 | err = iscsi_set_host_param(transport, ev); | |
1203 | break; | |
0896b752 | 1204 | default: |
1d9bf13a | 1205 | err = -ENOSYS; |
0896b752 AA |
1206 | break; |
1207 | } | |
1208 | ||
7b7232f3 | 1209 | module_put(transport->owner); |
0896b752 AA |
1210 | return err; |
1211 | } | |
1212 | ||
b5c7a12d | 1213 | /* |
cd40b7d3 DL |
1214 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1215 | * Malformed skbs with wrong lengths or invalid creds are not processed. | |
b5c7a12d | 1216 | */ |
0896b752 | 1217 | static void |
cd40b7d3 | 1218 | iscsi_if_rx(struct sk_buff *skb) |
0896b752 | 1219 | { |
0b950672 | 1220 | mutex_lock(&rx_queue_mutex); |
cd40b7d3 DL |
1221 | while (skb->len >= NLMSG_SPACE(0)) { |
1222 | int err; | |
1223 | uint32_t rlen; | |
1224 | struct nlmsghdr *nlh; | |
1225 | struct iscsi_uevent *ev; | |
1226 | ||
1227 | nlh = nlmsg_hdr(skb); | |
1228 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1229 | skb->len < nlh->nlmsg_len) { | |
1230 | break; | |
ee7f8e40 | 1231 | } |
ee7f8e40 | 1232 | |
cd40b7d3 DL |
1233 | ev = NLMSG_DATA(nlh); |
1234 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1235 | if (rlen > skb->len) | |
1236 | rlen = skb->len; | |
0896b752 | 1237 | |
cd40b7d3 DL |
1238 | err = iscsi_if_recv_msg(skb, nlh); |
1239 | if (err) { | |
1240 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1241 | ev->iferror = err; | |
0896b752 | 1242 | } |
cd40b7d3 DL |
1243 | do { |
1244 | /* | |
1245 | * special case for GET_STATS: | |
1246 | * on success - sending reply and stats from | |
1247 | * inside of if_recv_msg(), | |
1248 | * on error - fall through. | |
1249 | */ | |
1250 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1251 | break; | |
1252 | err = iscsi_if_send_reply( | |
1253 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1254 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
1255 | } while (err < 0 && err != -ECONNREFUSED); | |
1256 | skb_pull(skb, rlen); | |
0896b752 | 1257 | } |
0b950672 | 1258 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1259 | } |
1da177e4 | 1260 | |
7b8631b5 MC |
1261 | #define iscsi_cdev_to_conn(_cdev) \ |
1262 | iscsi_dev_to_conn(_cdev->dev) | |
1263 | ||
fd7255f5 MC |
1264 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1265 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1266 | __ATTR(_name,_mode,_show,_store) | |
1267 | ||
1da177e4 | 1268 | /* |
0896b752 | 1269 | * iSCSI connection attrs |
1da177e4 | 1270 | */ |
a54a52ca | 1271 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1272 | static ssize_t \ |
a54a52ca | 1273 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1274 | { \ |
7b8631b5 MC |
1275 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1276 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1277 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1278 | } |
1279 | ||
a54a52ca MC |
1280 | #define iscsi_conn_attr(field, param) \ |
1281 | iscsi_conn_attr_show(param) \ | |
1282 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1283 | NULL); |
0896b752 | 1284 | |
a54a52ca MC |
1285 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1286 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1287 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1288 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1289 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1290 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1291 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1292 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1293 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1294 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1295 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
f6d5180c MC |
1296 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1297 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); | |
1da177e4 | 1298 | |
7b8631b5 MC |
1299 | #define iscsi_cdev_to_session(_cdev) \ |
1300 | iscsi_dev_to_session(_cdev->dev) | |
1301 | ||
1da177e4 | 1302 | /* |
0896b752 | 1303 | * iSCSI session attrs |
1da177e4 | 1304 | */ |
b2c64167 | 1305 | #define iscsi_session_attr_show(param, perm) \ |
fd7255f5 | 1306 | static ssize_t \ |
a54a52ca | 1307 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1308 | { \ |
1309 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1310 | struct iscsi_transport *t = session->transport; \ | |
b2c64167 MC |
1311 | \ |
1312 | if (perm && !capable(CAP_SYS_ADMIN)) \ | |
1313 | return -EACCES; \ | |
a54a52ca | 1314 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1315 | } |
1316 | ||
b2c64167 MC |
1317 | #define iscsi_session_attr(field, param, perm) \ |
1318 | iscsi_session_attr_show(param, perm) \ | |
a54a52ca | 1319 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
fd7255f5 MC |
1320 | NULL); |
1321 | ||
b2c64167 MC |
1322 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1323 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); | |
1324 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); | |
1325 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); | |
1326 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); | |
1327 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); | |
1328 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); | |
1329 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); | |
1330 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); | |
1331 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); | |
1332 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); | |
1333 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); | |
1334 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); | |
1335 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); | |
4cd49ea1 MC |
1336 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1337 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); | |
1338 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); | |
1da177e4 | 1339 | |
6eabafbe MC |
1340 | static ssize_t |
1341 | show_priv_session_state(struct class_device *cdev, char *buf) | |
1342 | { | |
1343 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); | |
1344 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); | |
1345 | } | |
1346 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, | |
1347 | NULL); | |
1348 | ||
fd7255f5 MC |
1349 | #define iscsi_priv_session_attr_show(field, format) \ |
1350 | static ssize_t \ | |
a54a52ca | 1351 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1352 | { \ |
a54a52ca | 1353 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1354 | return sprintf(buf, format"\n", session->field); \ |
1355 | } | |
1356 | ||
1357 | #define iscsi_priv_session_attr(field, format) \ | |
1358 | iscsi_priv_session_attr_show(field, format) \ | |
1359 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1360 | NULL) | |
30a6c652 | 1361 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1362 | |
1819dc81 MC |
1363 | /* |
1364 | * iSCSI host attrs | |
1365 | */ | |
1366 | #define iscsi_host_attr_show(param) \ | |
1367 | static ssize_t \ | |
1368 | show_host_param_##param(struct class_device *cdev, char *buf) \ | |
1369 | { \ | |
1370 | struct Scsi_Host *shost = transport_class_to_shost(cdev); \ | |
1371 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ | |
1372 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ | |
1373 | } | |
1374 | ||
1375 | #define iscsi_host_attr(field, param) \ | |
1376 | iscsi_host_attr_show(param) \ | |
1377 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ | |
1378 | NULL); | |
1379 | ||
d8196ed2 | 1380 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1819dc81 | 1381 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
d8196ed2 | 1382 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
8ad5781a | 1383 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1819dc81 | 1384 | |
fd7255f5 MC |
1385 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1386 | do { \ | |
1387 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1388 | count++; \ | |
1389 | } while (0) | |
1390 | ||
a54a52ca | 1391 | |
fd7255f5 MC |
1392 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1393 | do { \ | |
1394 | if (tt->param_mask & param_flag) { \ | |
1395 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1396 | count++; \ |
fd7255f5 MC |
1397 | } \ |
1398 | } while (0) | |
1399 | ||
fd7255f5 MC |
1400 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1401 | do { \ | |
1402 | if (tt->param_mask & param_flag) { \ | |
1403 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1404 | count++; \ | |
1405 | } \ | |
1406 | } while (0) | |
1da177e4 | 1407 | |
1819dc81 MC |
1408 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1409 | do { \ | |
1410 | if (tt->host_param_mask & param_flag) { \ | |
1411 | priv->host_attrs[count] = &class_device_attr_host_##field; \ | |
1412 | count++; \ | |
1413 | } \ | |
1414 | } while (0) | |
1415 | ||
0896b752 AA |
1416 | static int iscsi_session_match(struct attribute_container *cont, |
1417 | struct device *dev) | |
1da177e4 | 1418 | { |
7b8631b5 | 1419 | struct iscsi_cls_session *session; |
1da177e4 | 1420 | struct Scsi_Host *shost; |
0896b752 AA |
1421 | struct iscsi_internal *priv; |
1422 | ||
1423 | if (!iscsi_is_session_dev(dev)) | |
1424 | return 0; | |
1da177e4 | 1425 | |
7b8631b5 MC |
1426 | session = iscsi_dev_to_session(dev); |
1427 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1428 | if (!shost->transportt) |
1da177e4 LT |
1429 | return 0; |
1430 | ||
0896b752 AA |
1431 | priv = to_iscsi_internal(shost->transportt); |
1432 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1433 | return 0; |
1434 | ||
0896b752 | 1435 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1436 | } |
1437 | ||
0896b752 AA |
1438 | static int iscsi_conn_match(struct attribute_container *cont, |
1439 | struct device *dev) | |
1440 | { | |
7b8631b5 MC |
1441 | struct iscsi_cls_session *session; |
1442 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1443 | struct Scsi_Host *shost; |
0896b752 | 1444 | struct iscsi_internal *priv; |
1da177e4 | 1445 | |
0896b752 | 1446 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1447 | return 0; |
1448 | ||
7b8631b5 MC |
1449 | conn = iscsi_dev_to_conn(dev); |
1450 | session = iscsi_dev_to_session(conn->dev.parent); | |
1451 | shost = iscsi_session_to_shost(session); | |
1452 | ||
0896b752 | 1453 | if (!shost->transportt) |
1da177e4 LT |
1454 | return 0; |
1455 | ||
0896b752 AA |
1456 | priv = to_iscsi_internal(shost->transportt); |
1457 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1458 | return 0; | |
1da177e4 | 1459 | |
0896b752 AA |
1460 | return &priv->conn_cont.ac == cont; |
1461 | } | |
1462 | ||
30a6c652 MC |
1463 | static int iscsi_host_match(struct attribute_container *cont, |
1464 | struct device *dev) | |
1465 | { | |
1466 | struct Scsi_Host *shost; | |
1467 | struct iscsi_internal *priv; | |
1468 | ||
1469 | if (!scsi_is_host_device(dev)) | |
1470 | return 0; | |
1471 | ||
1472 | shost = dev_to_shost(dev); | |
1473 | if (!shost->transportt || | |
1474 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1475 | return 0; | |
1476 | ||
1477 | priv = to_iscsi_internal(shost->transportt); | |
1478 | return &priv->t.host_attrs.ac == cont; | |
1479 | } | |
1480 | ||
7b8631b5 MC |
1481 | struct scsi_transport_template * |
1482 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1483 | { |
1484 | struct iscsi_internal *priv; | |
1485 | unsigned long flags; | |
1486 | int count = 0, err; | |
1487 | ||
1488 | BUG_ON(!tt); | |
1489 | ||
1490 | priv = iscsi_if_transport_lookup(tt); | |
1491 | if (priv) | |
7b8631b5 | 1492 | return NULL; |
0896b752 | 1493 | |
24669f75 | 1494 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1495 | if (!priv) |
7b8631b5 | 1496 | return NULL; |
0896b752 | 1497 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1498 | priv->daemon_pid = -1; |
0896b752 | 1499 | priv->iscsi_transport = tt; |
30a6c652 | 1500 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1501 | |
1502 | priv->cdev.class = &iscsi_transport_class; | |
1503 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1504 | err = class_device_register(&priv->cdev); | |
1505 | if (err) | |
1506 | goto free_priv; | |
1507 | ||
1508 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1509 | if (err) | |
1510 | goto unregister_cdev; | |
1511 | ||
30a6c652 MC |
1512 | /* host parameters */ |
1513 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1514 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1515 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1516 | priv->t.host_size = sizeof(struct iscsi_host); | |
30a6c652 MC |
1517 | transport_container_register(&priv->t.host_attrs); |
1518 | ||
d8196ed2 | 1519 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
22236961 | 1520 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1819dc81 | 1521 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
8ad5781a | 1522 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1819dc81 MC |
1523 | BUG_ON(count > ISCSI_HOST_ATTRS); |
1524 | priv->host_attrs[count] = NULL; | |
1525 | count = 0; | |
1526 | ||
0896b752 AA |
1527 | /* connection parameters */ |
1528 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1529 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1530 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1531 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1532 | |
fd7255f5 MC |
1533 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1534 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1535 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1536 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1537 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1538 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1539 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1540 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1541 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1542 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1543 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
f6d5180c MC |
1544 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
1545 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); | |
0896b752 AA |
1546 | |
1547 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1548 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1549 | count = 0; |
1da177e4 | 1550 | |
0896b752 AA |
1551 | /* session parameters */ |
1552 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1553 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1554 | priv->session_cont.ac.match = iscsi_session_match; | |
1555 | transport_container_register(&priv->session_cont); | |
1556 | ||
fd7255f5 MC |
1557 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1558 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1559 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1560 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1561 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1562 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1563 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1564 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1565 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1566 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
b2c64167 MC |
1567 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
1568 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); | |
1569 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); | |
1570 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); | |
843c0a8a | 1571 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
4cd49ea1 MC |
1572 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
1573 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); | |
30a6c652 | 1574 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
6eabafbe | 1575 | SETUP_PRIV_SESSION_RD_ATTR(state); |
fd7255f5 | 1576 | |
0896b752 AA |
1577 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1578 | priv->session_attrs[count] = NULL; | |
1579 | ||
1580 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1581 | list_add(&priv->list, &iscsi_transports); | |
1582 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1583 | ||
1584 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1585 | return &priv->t; |
1da177e4 | 1586 | |
0896b752 AA |
1587 | unregister_cdev: |
1588 | class_device_unregister(&priv->cdev); | |
1589 | free_priv: | |
1590 | kfree(priv); | |
7b8631b5 | 1591 | return NULL; |
1da177e4 | 1592 | } |
0896b752 AA |
1593 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1594 | ||
1595 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1596 | { | |
1597 | struct iscsi_internal *priv; | |
1598 | unsigned long flags; | |
1599 | ||
1600 | BUG_ON(!tt); | |
1601 | ||
0b950672 | 1602 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1603 | |
1604 | priv = iscsi_if_transport_lookup(tt); | |
1605 | BUG_ON (!priv); | |
1606 | ||
0896b752 AA |
1607 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1608 | list_del(&priv->list); | |
1609 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1610 | ||
1611 | transport_container_unregister(&priv->conn_cont); | |
1612 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1613 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1614 | |
1615 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1616 | class_device_unregister(&priv->cdev); | |
0b950672 | 1617 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1618 | |
0896b752 AA |
1619 | return 0; |
1620 | } | |
1621 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1622 | |
1da177e4 LT |
1623 | static __init int iscsi_transport_init(void) |
1624 | { | |
0896b752 | 1625 | int err; |
1da177e4 | 1626 | |
09492605 | 1627 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
f4246b33 MC |
1628 | ISCSI_TRANSPORT_VERSION); |
1629 | ||
41be1444 MC |
1630 | atomic_set(&iscsi_session_nr, 0); |
1631 | ||
0896b752 | 1632 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1633 | if (err) |
1634 | return err; | |
0896b752 | 1635 | |
30a6c652 | 1636 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1637 | if (err) |
1638 | goto unregister_transport_class; | |
1639 | ||
30a6c652 MC |
1640 | err = transport_class_register(&iscsi_connection_class); |
1641 | if (err) | |
1642 | goto unregister_host_class; | |
1643 | ||
0896b752 AA |
1644 | err = transport_class_register(&iscsi_session_class); |
1645 | if (err) | |
1646 | goto unregister_conn_class; | |
1647 | ||
b4b51029 | 1648 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, |
7b8631b5 | 1649 | THIS_MODULE); |
0896b752 AA |
1650 | if (!nls) { |
1651 | err = -ENOBUFS; | |
43a145a3 | 1652 | goto unregister_session_class; |
0896b752 AA |
1653 | } |
1654 | ||
d8bf541e MC |
1655 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
1656 | if (!iscsi_eh_timer_workq) | |
1657 | goto release_nls; | |
1658 | ||
43a145a3 | 1659 | return 0; |
0896b752 | 1660 | |
d8bf541e | 1661 | release_nls: |
b7c6ba6e | 1662 | netlink_kernel_release(nls); |
0896b752 AA |
1663 | unregister_session_class: |
1664 | transport_class_unregister(&iscsi_session_class); | |
1665 | unregister_conn_class: | |
1666 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1667 | unregister_host_class: |
1668 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1669 | unregister_transport_class: |
1670 | class_unregister(&iscsi_transport_class); | |
1671 | return err; | |
1da177e4 LT |
1672 | } |
1673 | ||
1674 | static void __exit iscsi_transport_exit(void) | |
1675 | { | |
d8bf541e | 1676 | destroy_workqueue(iscsi_eh_timer_workq); |
b7c6ba6e | 1677 | netlink_kernel_release(nls); |
0896b752 AA |
1678 | transport_class_unregister(&iscsi_connection_class); |
1679 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1680 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1681 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1682 | } |
1683 | ||
1684 | module_init(iscsi_transport_init); | |
1685 | module_exit(iscsi_transport_exit); | |
1686 | ||
0896b752 AA |
1687 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1688 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1689 | "Alex Aizman <itn780@yahoo.com>"); | |
1690 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1691 | MODULE_LICENSE("GPL"); |
f4246b33 | 1692 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |