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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 | 130 | |
bd976f62 | 131 | snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d", |
26974789 | 132 | shost->host_no); |
bd976f62 MC |
133 | ihost->scan_workq = create_singlethread_workqueue( |
134 | ihost->scan_workq_name); | |
135 | if (!ihost->scan_workq) | |
26974789 MC |
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 | ||
bd976f62 | 146 | destroy_workqueue(ihost->scan_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 | ||
bd976f62 MC |
305 | static void iscsi_scan_session(struct work_struct *work) |
306 | { | |
307 | struct iscsi_cls_session *session = | |
308 | container_of(work, struct iscsi_cls_session, scan_work); | |
309 | unsigned long flags; | |
310 | ||
311 | spin_lock_irqsave(&session->lock, flags); | |
312 | if (session->state != ISCSI_SESSION_LOGGED_IN) { | |
313 | spin_unlock_irqrestore(&session->lock, flags); | |
314 | return; | |
315 | } | |
316 | spin_unlock_irqrestore(&session->lock, flags); | |
317 | ||
318 | scsi_scan_target(&session->dev, 0, session->target_id, | |
319 | SCAN_WILD_CARD, 1); | |
320 | } | |
321 | ||
c4028958 | 322 | static void session_recovery_timedout(struct work_struct *work) |
30a6c652 | 323 | { |
c4028958 DH |
324 | struct iscsi_cls_session *session = |
325 | container_of(work, struct iscsi_cls_session, | |
326 | recovery_work.work); | |
6eabafbe | 327 | unsigned long flags; |
30a6c652 | 328 | |
be2df72e OG |
329 | dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
330 | "out after %d secs\n", session->recovery_tmo); | |
30a6c652 | 331 | |
6eabafbe MC |
332 | spin_lock_irqsave(&session->lock, flags); |
333 | switch (session->state) { | |
334 | case ISCSI_SESSION_FAILED: | |
335 | session->state = ISCSI_SESSION_FREE; | |
336 | break; | |
337 | case ISCSI_SESSION_LOGGED_IN: | |
338 | case ISCSI_SESSION_FREE: | |
339 | /* we raced with the unblock's flush */ | |
340 | spin_unlock_irqrestore(&session->lock, flags); | |
341 | return; | |
342 | } | |
343 | spin_unlock_irqrestore(&session->lock, flags); | |
344 | ||
30a6c652 MC |
345 | if (session->transport->session_recovery_timedout) |
346 | session->transport->session_recovery_timedout(session); | |
347 | ||
348 | scsi_target_unblock(&session->dev); | |
349 | } | |
350 | ||
6eabafbe | 351 | void __iscsi_unblock_session(struct iscsi_cls_session *session) |
30a6c652 MC |
352 | { |
353 | if (!cancel_delayed_work(&session->recovery_work)) | |
d8bf541e | 354 | flush_workqueue(iscsi_eh_timer_workq); |
30a6c652 MC |
355 | scsi_target_unblock(&session->dev); |
356 | } | |
6eabafbe MC |
357 | |
358 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
359 | { | |
bd976f62 MC |
360 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
361 | struct iscsi_host *ihost = shost->shost_data; | |
6eabafbe MC |
362 | unsigned long flags; |
363 | ||
364 | spin_lock_irqsave(&session->lock, flags); | |
365 | session->state = ISCSI_SESSION_LOGGED_IN; | |
366 | spin_unlock_irqrestore(&session->lock, flags); | |
367 | ||
368 | __iscsi_unblock_session(session); | |
bd976f62 | 369 | queue_work(ihost->scan_workq, &session->scan_work); |
6eabafbe | 370 | } |
30a6c652 MC |
371 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
372 | ||
373 | void iscsi_block_session(struct iscsi_cls_session *session) | |
374 | { | |
6eabafbe MC |
375 | unsigned long flags; |
376 | ||
377 | spin_lock_irqsave(&session->lock, flags); | |
378 | session->state = ISCSI_SESSION_FAILED; | |
379 | spin_unlock_irqrestore(&session->lock, flags); | |
380 | ||
30a6c652 | 381 | scsi_target_block(&session->dev); |
d8bf541e MC |
382 | queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, |
383 | session->recovery_tmo * HZ); | |
30a6c652 MC |
384 | } |
385 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
386 | ||
26974789 MC |
387 | static void __iscsi_unbind_session(struct work_struct *work) |
388 | { | |
389 | struct iscsi_cls_session *session = | |
390 | container_of(work, struct iscsi_cls_session, | |
391 | unbind_work); | |
392 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
393 | struct iscsi_host *ihost = shost->shost_data; | |
394 | ||
395 | /* Prevent new scans and make sure scanning is not in progress */ | |
396 | mutex_lock(&ihost->mutex); | |
397 | if (list_empty(&session->host_list)) { | |
398 | mutex_unlock(&ihost->mutex); | |
399 | return; | |
400 | } | |
401 | list_del_init(&session->host_list); | |
402 | mutex_unlock(&ihost->mutex); | |
403 | ||
404 | scsi_remove_target(&session->dev); | |
405 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); | |
406 | } | |
407 | ||
408 | static int iscsi_unbind_session(struct iscsi_cls_session *session) | |
409 | { | |
410 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
411 | struct iscsi_host *ihost = shost->shost_data; | |
412 | ||
bd976f62 | 413 | return queue_work(ihost->scan_workq, &session->unbind_work); |
26974789 MC |
414 | } |
415 | ||
7b8631b5 | 416 | struct iscsi_cls_session * |
8434aa8b MC |
417 | iscsi_alloc_session(struct Scsi_Host *shost, |
418 | struct iscsi_transport *transport) | |
7b8631b5 MC |
419 | { |
420 | struct iscsi_cls_session *session; | |
7b8631b5 | 421 | |
b5c7a12d MC |
422 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
423 | GFP_KERNEL); | |
7b8631b5 | 424 | if (!session) |
f53a88da MC |
425 | return NULL; |
426 | ||
7b8631b5 | 427 | session->transport = transport; |
30a6c652 | 428 | session->recovery_tmo = 120; |
6eabafbe | 429 | session->state = ISCSI_SESSION_FREE; |
c4028958 | 430 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
30a6c652 MC |
431 | INIT_LIST_HEAD(&session->host_list); |
432 | INIT_LIST_HEAD(&session->sess_list); | |
26974789 | 433 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
bd976f62 | 434 | INIT_WORK(&session->scan_work, iscsi_scan_session); |
6eabafbe | 435 | spin_lock_init(&session->lock); |
7b8631b5 | 436 | |
6a8a0d36 MC |
437 | /* this is released in the dev's release function */ |
438 | scsi_host_get(shost); | |
8434aa8b MC |
439 | session->dev.parent = &shost->shost_gendev; |
440 | session->dev.release = iscsi_session_release; | |
441 | device_initialize(&session->dev); | |
b5c7a12d MC |
442 | if (transport->sessiondata_size) |
443 | session->dd_data = &session[1]; | |
8434aa8b MC |
444 | return session; |
445 | } | |
446 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
447 | ||
6a8a0d36 | 448 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
449 | { |
450 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
451 | struct iscsi_host *ihost; | |
26974789 | 452 | unsigned long flags; |
8434aa8b | 453 | int err; |
b5c7a12d | 454 | |
30a6c652 | 455 | ihost = shost->shost_data; |
41be1444 | 456 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
6a8a0d36 | 457 | session->target_id = target_id; |
30a6c652 | 458 | |
b5c7a12d MC |
459 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
460 | session->sid); | |
8434aa8b | 461 | err = device_add(&session->dev); |
7b8631b5 MC |
462 | if (err) { |
463 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
464 | "register session's dev\n"); | |
8434aa8b | 465 | goto release_host; |
7b8631b5 MC |
466 | } |
467 | transport_register_device(&session->dev); | |
468 | ||
26974789 MC |
469 | spin_lock_irqsave(&sesslock, flags); |
470 | list_add(&session->sess_list, &sesslist); | |
471 | spin_unlock_irqrestore(&sesslock, flags); | |
472 | ||
30a6c652 MC |
473 | mutex_lock(&ihost->mutex); |
474 | list_add(&session->host_list, &ihost->sessions); | |
475 | mutex_unlock(&ihost->mutex); | |
26974789 MC |
476 | |
477 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); | |
8434aa8b | 478 | return 0; |
30a6c652 | 479 | |
8434aa8b MC |
480 | release_host: |
481 | scsi_host_put(shost); | |
482 | return err; | |
7b8631b5 | 483 | } |
8434aa8b | 484 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
485 | |
486 | /** | |
8434aa8b MC |
487 | * iscsi_create_session - create iscsi class session |
488 | * @shost: scsi host | |
489 | * @transport: iscsi transport | |
eb44820c | 490 | * @target_id: which target |
7b8631b5 | 491 | * |
8434aa8b | 492 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 493 | */ |
8434aa8b MC |
494 | struct iscsi_cls_session * |
495 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
496 | struct iscsi_transport *transport, |
497 | unsigned int target_id) | |
8434aa8b MC |
498 | { |
499 | struct iscsi_cls_session *session; | |
500 | ||
501 | session = iscsi_alloc_session(shost, transport); | |
502 | if (!session) | |
503 | return NULL; | |
504 | ||
6a8a0d36 | 505 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
506 | iscsi_free_session(session); |
507 | return NULL; | |
508 | } | |
509 | return session; | |
510 | } | |
511 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
512 | ||
26974789 MC |
513 | static void iscsi_conn_release(struct device *dev) |
514 | { | |
515 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
516 | struct device *parent = conn->dev.parent; | |
517 | ||
518 | kfree(conn); | |
519 | put_device(parent); | |
520 | } | |
521 | ||
522 | static int iscsi_is_conn_dev(const struct device *dev) | |
523 | { | |
524 | return dev->release == iscsi_conn_release; | |
525 | } | |
526 | ||
527 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) | |
528 | { | |
529 | if (!iscsi_is_conn_dev(dev)) | |
530 | return 0; | |
531 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); | |
532 | } | |
533 | ||
8434aa8b | 534 | void iscsi_remove_session(struct iscsi_cls_session *session) |
7b8631b5 | 535 | { |
30a6c652 MC |
536 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
537 | struct iscsi_host *ihost = shost->shost_data; | |
26974789 MC |
538 | unsigned long flags; |
539 | int err; | |
540 | ||
541 | spin_lock_irqsave(&sesslock, flags); | |
542 | list_del(&session->sess_list); | |
543 | spin_unlock_irqrestore(&sesslock, flags); | |
30a6c652 | 544 | |
26974789 MC |
545 | /* |
546 | * If we are blocked let commands flow again. The lld or iscsi | |
547 | * layer should set up the queuecommand to fail commands. | |
548 | */ | |
6eabafbe MC |
549 | spin_lock_irqsave(&session->lock, flags); |
550 | session->state = ISCSI_SESSION_FREE; | |
551 | spin_unlock_irqrestore(&session->lock, flags); | |
552 | __iscsi_unblock_session(session); | |
26974789 | 553 | iscsi_unbind_session(session); |
bd976f62 MC |
554 | |
555 | /* flush running scans */ | |
556 | flush_workqueue(ihost->scan_workq); | |
26974789 MC |
557 | /* |
558 | * If the session dropped while removing devices then we need to make | |
559 | * sure it is not blocked | |
560 | */ | |
30a6c652 | 561 | if (!cancel_delayed_work(&session->recovery_work)) |
d8bf541e | 562 | flush_workqueue(iscsi_eh_timer_workq); |
30a6c652 | 563 | |
26974789 MC |
564 | /* hw iscsi may not have removed all connections from session */ |
565 | err = device_for_each_child(&session->dev, NULL, | |
566 | iscsi_iter_destroy_conn_fn); | |
567 | if (err) | |
568 | dev_printk(KERN_ERR, &session->dev, "iscsi: Could not delete " | |
569 | "all connections for session. Error %d.\n", err); | |
8434aa8b | 570 | |
7b8631b5 | 571 | transport_unregister_device(&session->dev); |
8434aa8b MC |
572 | device_del(&session->dev); |
573 | } | |
574 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
575 | ||
576 | void iscsi_free_session(struct iscsi_cls_session *session) | |
577 | { | |
26974789 | 578 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
8434aa8b | 579 | put_device(&session->dev); |
7b8631b5 | 580 | } |
8434aa8b MC |
581 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
582 | ||
583 | /** | |
584 | * iscsi_destroy_session - destroy iscsi session | |
585 | * @session: iscsi_session | |
586 | * | |
587 | * Can be called by a LLD or iscsi_transport. There must not be | |
588 | * any running connections. | |
eb44820c | 589 | */ |
8434aa8b MC |
590 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
591 | { | |
592 | iscsi_remove_session(session); | |
593 | iscsi_free_session(session); | |
594 | return 0; | |
595 | } | |
7b8631b5 MC |
596 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
597 | ||
7b8631b5 MC |
598 | /** |
599 | * iscsi_create_conn - create iscsi class connection | |
600 | * @session: iscsi cls session | |
601 | * @cid: connection id | |
602 | * | |
603 | * This can be called from a LLD or iscsi_transport. The connection | |
604 | * is child of the session so cid must be unique for all connections | |
605 | * on the session. | |
b5c7a12d MC |
606 | * |
607 | * Since we do not support MCS, cid will normally be zero. In some cases | |
608 | * for software iscsi we could be trying to preallocate a connection struct | |
609 | * in which case there could be two connection structs and cid would be | |
610 | * non-zero. | |
eb44820c | 611 | */ |
7b8631b5 MC |
612 | struct iscsi_cls_conn * |
613 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
614 | { | |
615 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 | 616 | struct iscsi_cls_conn *conn; |
26974789 | 617 | unsigned long flags; |
7b8631b5 MC |
618 | int err; |
619 | ||
620 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
621 | if (!conn) | |
622 | return NULL; | |
623 | ||
624 | if (transport->conndata_size) | |
625 | conn->dd_data = &conn[1]; | |
626 | ||
627 | INIT_LIST_HEAD(&conn->conn_list); | |
628 | conn->transport = transport; | |
b5c7a12d | 629 | conn->cid = cid; |
7b8631b5 MC |
630 | |
631 | /* this is released in the dev's release function */ | |
632 | if (!get_device(&session->dev)) | |
43a145a3 | 633 | goto free_conn; |
b5c7a12d | 634 | |
7b8631b5 | 635 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 636 | session->sid, cid); |
7b8631b5 MC |
637 | conn->dev.parent = &session->dev; |
638 | conn->dev.release = iscsi_conn_release; | |
639 | err = device_register(&conn->dev); | |
640 | if (err) { | |
641 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
642 | "connection's dev\n"); | |
643 | goto release_parent_ref; | |
644 | } | |
645 | transport_register_device(&conn->dev); | |
26974789 MC |
646 | |
647 | spin_lock_irqsave(&connlock, flags); | |
648 | list_add(&conn->conn_list, &connlist); | |
649 | conn->active = 1; | |
650 | spin_unlock_irqrestore(&connlock, flags); | |
7b8631b5 MC |
651 | return conn; |
652 | ||
653 | release_parent_ref: | |
654 | put_device(&session->dev); | |
655 | free_conn: | |
656 | kfree(conn); | |
657 | return NULL; | |
658 | } | |
659 | ||
660 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
661 | ||
662 | /** | |
663 | * iscsi_destroy_conn - destroy iscsi class connection | |
eb44820c | 664 | * @conn: iscsi cls session |
7b8631b5 | 665 | * |
26974789 | 666 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 667 | */ |
7b8631b5 MC |
668 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
669 | { | |
26974789 MC |
670 | unsigned long flags; |
671 | ||
672 | spin_lock_irqsave(&connlock, flags); | |
673 | conn->active = 0; | |
674 | list_del(&conn->conn_list); | |
675 | spin_unlock_irqrestore(&connlock, flags); | |
676 | ||
7b8631b5 MC |
677 | transport_unregister_device(&conn->dev); |
678 | device_unregister(&conn->dev); | |
679 | return 0; | |
680 | } | |
7b8631b5 MC |
681 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
682 | ||
7b8631b5 MC |
683 | /* |
684 | * iscsi interface functions | |
685 | */ | |
0896b752 AA |
686 | static struct iscsi_internal * |
687 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
688 | { | |
689 | struct iscsi_internal *priv; | |
690 | unsigned long flags; | |
691 | ||
692 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
693 | list_for_each_entry(priv, &iscsi_transports, list) { | |
694 | if (tt == priv->iscsi_transport) { | |
695 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
696 | return priv; | |
697 | } | |
698 | } | |
699 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
700 | return NULL; | |
701 | } | |
1da177e4 | 702 | |
53cb8a1f | 703 | static int |
43a145a3 | 704 | iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) |
53cb8a1f | 705 | { |
53cb8a1f MC |
706 | int rc; |
707 | ||
9aaa2b46 | 708 | rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
53cb8a1f | 709 | if (rc < 0) { |
53cb8a1f MC |
710 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); |
711 | return rc; | |
712 | } | |
713 | ||
53cb8a1f MC |
714 | return 0; |
715 | } | |
716 | ||
0896b752 | 717 | static int |
43a145a3 | 718 | iscsi_unicast_skb(struct sk_buff *skb, int pid) |
0896b752 | 719 | { |
0896b752 | 720 | int rc; |
1da177e4 | 721 | |
790f39a2 | 722 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 | 723 | if (rc < 0) { |
0896b752 AA |
724 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
725 | return rc; | |
726 | } | |
727 | ||
0896b752 | 728 | return 0; |
1da177e4 | 729 | } |
1da177e4 | 730 | |
7b7232f3 | 731 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 732 | char *data, uint32_t data_size) |
1da177e4 | 733 | { |
0896b752 AA |
734 | struct nlmsghdr *nlh; |
735 | struct sk_buff *skb; | |
736 | struct iscsi_uevent *ev; | |
0896b752 | 737 | char *pdu; |
790f39a2 | 738 | struct iscsi_internal *priv; |
0896b752 AA |
739 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
740 | data_size); | |
741 | ||
790f39a2 MC |
742 | priv = iscsi_if_transport_lookup(conn->transport); |
743 | if (!priv) | |
744 | return -EINVAL; | |
745 | ||
43a145a3 | 746 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 747 | if (!skb) { |
7b7232f3 | 748 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
749 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
750 | "control PDU: OOM\n"); | |
0896b752 AA |
751 | return -ENOMEM; |
752 | } | |
1da177e4 | 753 | |
790f39a2 | 754 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
755 | ev = NLMSG_DATA(nlh); |
756 | memset(ev, 0, sizeof(*ev)); | |
757 | ev->transport_handle = iscsi_handle(conn->transport); | |
758 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
b5c7a12d MC |
759 | ev->r.recv_req.cid = conn->cid; |
760 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
761 | pdu = (char*)ev + sizeof(*ev); |
762 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
763 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 764 | |
43a145a3 | 765 | return iscsi_unicast_skb(skb, priv->daemon_pid); |
1da177e4 | 766 | } |
0896b752 | 767 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 768 | |
7b7232f3 | 769 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 770 | { |
6eabafbe | 771 | struct iscsi_cls_session *session = iscsi_conn_to_session(conn); |
0896b752 AA |
772 | struct nlmsghdr *nlh; |
773 | struct sk_buff *skb; | |
774 | struct iscsi_uevent *ev; | |
790f39a2 | 775 | struct iscsi_internal *priv; |
0896b752 | 776 | int len = NLMSG_SPACE(sizeof(*ev)); |
6eabafbe | 777 | unsigned long flags; |
0896b752 | 778 | |
790f39a2 MC |
779 | priv = iscsi_if_transport_lookup(conn->transport); |
780 | if (!priv) | |
781 | return; | |
782 | ||
6eabafbe MC |
783 | spin_lock_irqsave(&session->lock, flags); |
784 | if (session->state == ISCSI_SESSION_LOGGED_IN) | |
785 | session->state = ISCSI_SESSION_FAILED; | |
786 | spin_unlock_irqrestore(&session->lock, flags); | |
787 | ||
43a145a3 | 788 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 789 | if (!skb) { |
7b8631b5 MC |
790 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
791 | "conn error (%d)\n", error); | |
0896b752 AA |
792 | return; |
793 | } | |
794 | ||
790f39a2 | 795 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
796 | ev = NLMSG_DATA(nlh); |
797 | ev->transport_handle = iscsi_handle(conn->transport); | |
798 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
0896b752 | 799 | ev->r.connerror.error = error; |
b5c7a12d MC |
800 | ev->r.connerror.cid = conn->cid; |
801 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 802 | |
43a145a3 | 803 | iscsi_broadcast_skb(skb, GFP_ATOMIC); |
1da177e4 | 804 | |
7b8631b5 MC |
805 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
806 | error); | |
0896b752 AA |
807 | } |
808 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
809 | ||
810 | static int | |
811 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
812 | void *payload, int size) | |
813 | { | |
814 | struct sk_buff *skb; | |
815 | struct nlmsghdr *nlh; | |
816 | int len = NLMSG_SPACE(size); | |
817 | int flags = multi ? NLM_F_MULTI : 0; | |
818 | int t = done ? NLMSG_DONE : type; | |
819 | ||
43a145a3 | 820 | skb = alloc_skb(len, GFP_ATOMIC); |
239a7dc2 MC |
821 | if (!skb) { |
822 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); | |
823 | return -ENOMEM; | |
824 | } | |
0896b752 AA |
825 | |
826 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
827 | nlh->nlmsg_flags = flags; | |
828 | memcpy(NLMSG_DATA(nlh), payload, size); | |
43a145a3 | 829 | return iscsi_unicast_skb(skb, pid); |
1da177e4 | 830 | } |
1da177e4 | 831 | |
7b8631b5 | 832 | static int |
5b940adf | 833 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
834 | { |
835 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
836 | struct iscsi_stats *stats; | |
837 | struct sk_buff *skbstat; | |
838 | struct iscsi_cls_conn *conn; | |
839 | struct nlmsghdr *nlhstat; | |
840 | struct iscsi_uevent *evstat; | |
790f39a2 | 841 | struct iscsi_internal *priv; |
7b8631b5 MC |
842 | int len = NLMSG_SPACE(sizeof(*ev) + |
843 | sizeof(struct iscsi_stats) + | |
844 | sizeof(struct iscsi_stats_custom) * | |
845 | ISCSI_STATS_CUSTOM_MAX); | |
846 | int err = 0; | |
0896b752 | 847 | |
790f39a2 MC |
848 | priv = iscsi_if_transport_lookup(transport); |
849 | if (!priv) | |
850 | return -EINVAL; | |
851 | ||
b5c7a12d | 852 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
853 | if (!conn) |
854 | return -EEXIST; | |
0896b752 | 855 | |
7b8631b5 MC |
856 | do { |
857 | int actual_size; | |
0896b752 | 858 | |
43a145a3 | 859 | skbstat = alloc_skb(len, GFP_ATOMIC); |
7b8631b5 MC |
860 | if (!skbstat) { |
861 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
862 | "deliver stats: OOM\n"); | |
863 | return -ENOMEM; | |
864 | } | |
865 | ||
790f39a2 | 866 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
867 | (len - sizeof(*nlhstat)), 0); |
868 | evstat = NLMSG_DATA(nlhstat); | |
869 | memset(evstat, 0, sizeof(*evstat)); | |
870 | evstat->transport_handle = iscsi_handle(conn->transport); | |
871 | evstat->type = nlh->nlmsg_type; | |
b5c7a12d MC |
872 | evstat->u.get_stats.cid = |
873 | ev->u.get_stats.cid; | |
874 | evstat->u.get_stats.sid = | |
875 | ev->u.get_stats.sid; | |
7b8631b5 MC |
876 | stats = (struct iscsi_stats *) |
877 | ((char*)evstat + sizeof(*evstat)); | |
878 | memset(stats, 0, sizeof(*stats)); | |
879 | ||
7b7232f3 | 880 | transport->get_stats(conn, stats); |
7b8631b5 MC |
881 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
882 | sizeof(struct iscsi_stats) + | |
883 | sizeof(struct iscsi_stats_custom) * | |
884 | stats->custom_length); | |
885 | actual_size -= sizeof(*nlhstat); | |
886 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 887 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
888 | nlhstat->nlmsg_len = actual_size; |
889 | ||
43a145a3 | 890 | err = iscsi_unicast_skb(skbstat, priv->daemon_pid); |
7b8631b5 MC |
891 | } while (err < 0 && err != -ECONNREFUSED); |
892 | ||
893 | return err; | |
0896b752 AA |
894 | } |
895 | ||
53cb8a1f | 896 | /** |
26974789 MC |
897 | * iscsi_session_event - send session destr. completion event |
898 | * @session: iscsi class session | |
899 | * @event: type of event | |
eb44820c | 900 | */ |
26974789 MC |
901 | int iscsi_session_event(struct iscsi_cls_session *session, |
902 | enum iscsi_uevent_e event) | |
53cb8a1f MC |
903 | { |
904 | struct iscsi_internal *priv; | |
53cb8a1f MC |
905 | struct Scsi_Host *shost; |
906 | struct iscsi_uevent *ev; | |
907 | struct sk_buff *skb; | |
908 | struct nlmsghdr *nlh; | |
53cb8a1f MC |
909 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
910 | ||
26974789 | 911 | priv = iscsi_if_transport_lookup(session->transport); |
53cb8a1f MC |
912 | if (!priv) |
913 | return -EINVAL; | |
53cb8a1f MC |
914 | shost = iscsi_session_to_shost(session); |
915 | ||
43a145a3 | 916 | skb = alloc_skb(len, GFP_KERNEL); |
53cb8a1f | 917 | if (!skb) { |
26974789 MC |
918 | dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " |
919 | "of session event %u\n", event); | |
53cb8a1f MC |
920 | return -ENOMEM; |
921 | } | |
922 | ||
923 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
924 | ev = NLMSG_DATA(nlh); | |
26974789 | 925 | ev->transport_handle = iscsi_handle(session->transport); |
53cb8a1f | 926 | |
26974789 MC |
927 | ev->type = event; |
928 | switch (event) { | |
929 | case ISCSI_KEVENT_DESTROY_SESSION: | |
930 | ev->r.d_session.host_no = shost->host_no; | |
931 | ev->r.d_session.sid = session->sid; | |
932 | break; | |
933 | case ISCSI_KEVENT_CREATE_SESSION: | |
934 | ev->r.c_session_ret.host_no = shost->host_no; | |
935 | ev->r.c_session_ret.sid = session->sid; | |
936 | break; | |
937 | case ISCSI_KEVENT_UNBIND_SESSION: | |
938 | ev->r.unbind_session.host_no = shost->host_no; | |
939 | ev->r.unbind_session.sid = session->sid; | |
940 | break; | |
941 | default: | |
942 | dev_printk(KERN_ERR, &session->dev, "Invalid event %u.\n", | |
943 | event); | |
944 | kfree_skb(skb); | |
53cb8a1f | 945 | return -EINVAL; |
53cb8a1f MC |
946 | } |
947 | ||
53cb8a1f MC |
948 | /* |
949 | * this will occur if the daemon is not up, so we just warn | |
950 | * the user and when the daemon is restarted it will handle it | |
951 | */ | |
43a145a3 | 952 | rc = iscsi_broadcast_skb(skb, GFP_KERNEL); |
53cb8a1f | 953 | if (rc < 0) |
26974789 MC |
954 | dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " |
955 | "of session event %u. Check iscsi daemon\n", event); | |
53cb8a1f MC |
956 | return rc; |
957 | } | |
26974789 | 958 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
53cb8a1f | 959 | |
0896b752 AA |
960 | static int |
961 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
962 | { | |
963 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 964 | struct iscsi_cls_session *session; |
b5c7a12d | 965 | uint32_t hostno; |
0896b752 | 966 | |
7996a778 | 967 | session = transport->create_session(transport, &priv->t, |
1548271e MC |
968 | ev->u.c_session.cmds_max, |
969 | ev->u.c_session.queue_depth, | |
7b7232f3 | 970 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 971 | &hostno); |
7b7232f3 | 972 | if (!session) |
7b8631b5 | 973 | return -ENOMEM; |
0896b752 | 974 | |
b5c7a12d MC |
975 | ev->r.c_session_ret.host_no = hostno; |
976 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 977 | return 0; |
0896b752 AA |
978 | } |
979 | ||
980 | static int | |
7b7232f3 | 981 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 982 | { |
7b8631b5 | 983 | struct iscsi_cls_conn *conn; |
7b7232f3 | 984 | struct iscsi_cls_session *session; |
7b8631b5 | 985 | |
b5c7a12d MC |
986 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
987 | if (!session) { | |
988 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
989 | ev->u.c_conn.sid); | |
7b8631b5 | 990 | return -EINVAL; |
b5c7a12d | 991 | } |
0896b752 | 992 | |
7b7232f3 | 993 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
994 | if (!conn) { |
995 | printk(KERN_ERR "iscsi: couldn't create a new " | |
996 | "connection for session %d\n", | |
997 | session->sid); | |
7b7232f3 | 998 | return -ENOMEM; |
b5c7a12d | 999 | } |
0896b752 | 1000 | |
b5c7a12d MC |
1001 | ev->r.c_conn_ret.sid = session->sid; |
1002 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 | 1003 | return 0; |
1da177e4 LT |
1004 | } |
1005 | ||
0896b752 AA |
1006 | static int |
1007 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1008 | { | |
7b8631b5 | 1009 | struct iscsi_cls_conn *conn; |
0896b752 | 1010 | |
b5c7a12d | 1011 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1012 | if (!conn) |
7b8631b5 | 1013 | return -EINVAL; |
0896b752 | 1014 | |
7b8631b5 MC |
1015 | if (transport->destroy_conn) |
1016 | transport->destroy_conn(conn); | |
7b8631b5 | 1017 | return 0; |
0896b752 AA |
1018 | } |
1019 | ||
fd7255f5 MC |
1020 | static int |
1021 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1022 | { | |
1023 | char *data = (char*)ev + sizeof(*ev); | |
1024 | struct iscsi_cls_conn *conn; | |
1025 | struct iscsi_cls_session *session; | |
a54a52ca | 1026 | int err = 0, value = 0; |
fd7255f5 MC |
1027 | |
1028 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1029 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1030 | if (!conn || !session) | |
1031 | return -EINVAL; | |
1032 | ||
1033 | switch (ev->u.set_param.param) { | |
30a6c652 | 1034 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1035 | sscanf(data, "%d", &value); |
30a6c652 MC |
1036 | if (value != 0) |
1037 | session->recovery_tmo = value; | |
1038 | break; | |
fd7255f5 | 1039 | default: |
a54a52ca MC |
1040 | err = transport->set_param(conn, ev->u.set_param.param, |
1041 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1042 | } |
1043 | ||
1044 | return err; | |
1045 | } | |
1046 | ||
264faaaa OG |
1047 | static int |
1048 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1049 | struct iscsi_uevent *ev, int msg_type) | |
1050 | { | |
1051 | struct sockaddr *dst_addr; | |
1052 | int rc = 0; | |
1053 | ||
1054 | switch (msg_type) { | |
1055 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1056 | if (!transport->ep_connect) | |
1057 | return -EINVAL; | |
1058 | ||
1059 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1060 | rc = transport->ep_connect(dst_addr, | |
1061 | ev->u.ep_connect.non_blocking, | |
1062 | &ev->r.ep_connect_ret.handle); | |
1063 | break; | |
1064 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1065 | if (!transport->ep_poll) | |
1066 | return -EINVAL; | |
1067 | ||
1068 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1069 | ev->u.ep_poll.timeout_ms); | |
1070 | break; | |
1071 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1072 | if (!transport->ep_disconnect) | |
1073 | return -EINVAL; | |
1074 | ||
1075 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1076 | break; | |
1077 | } | |
1078 | return rc; | |
1079 | } | |
1080 | ||
01cb225d MC |
1081 | static int |
1082 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1083 | struct iscsi_uevent *ev) | |
1084 | { | |
2174a04e | 1085 | struct Scsi_Host *shost; |
01cb225d | 1086 | struct sockaddr *dst_addr; |
2174a04e | 1087 | int err; |
01cb225d MC |
1088 | |
1089 | if (!transport->tgt_dscvr) | |
1090 | return -EINVAL; | |
1091 | ||
2174a04e MC |
1092 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
1093 | if (IS_ERR(shost)) { | |
1094 | printk(KERN_ERR "target discovery could not find host no %u\n", | |
1095 | ev->u.tgt_dscvr.host_no); | |
1096 | return -ENODEV; | |
1097 | } | |
1098 | ||
1099 | ||
01cb225d | 1100 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
2174a04e MC |
1101 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1102 | ev->u.tgt_dscvr.enable, dst_addr); | |
1103 | scsi_host_put(shost); | |
1104 | return err; | |
01cb225d MC |
1105 | } |
1106 | ||
1d9bf13a MC |
1107 | static int |
1108 | iscsi_set_host_param(struct iscsi_transport *transport, | |
1109 | struct iscsi_uevent *ev) | |
1110 | { | |
1111 | char *data = (char*)ev + sizeof(*ev); | |
1112 | struct Scsi_Host *shost; | |
1113 | int err; | |
1114 | ||
1115 | if (!transport->set_host_param) | |
1116 | return -ENOSYS; | |
1117 | ||
1118 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); | |
1119 | if (IS_ERR(shost)) { | |
1120 | printk(KERN_ERR "set_host_param could not find host no %u\n", | |
1121 | ev->u.set_host_param.host_no); | |
1122 | return -ENODEV; | |
1123 | } | |
1124 | ||
1125 | err = transport->set_host_param(shost, ev->u.set_host_param.param, | |
1126 | data, ev->u.set_host_param.len); | |
1127 | scsi_host_put(shost); | |
1128 | return err; | |
1129 | } | |
1130 | ||
0896b752 AA |
1131 | static int |
1132 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1133 | { | |
1134 | int err = 0; | |
1135 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1136 | struct iscsi_transport *transport = NULL; | |
1137 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1138 | struct iscsi_cls_session *session; |
1139 | struct iscsi_cls_conn *conn; | |
0896b752 | 1140 | |
0896b752 AA |
1141 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1142 | if (!priv) | |
1143 | return -EINVAL; | |
1144 | transport = priv->iscsi_transport; | |
1145 | ||
7b7232f3 MC |
1146 | if (!try_module_get(transport->owner)) |
1147 | return -EINVAL; | |
1148 | ||
790f39a2 MC |
1149 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1150 | ||
0896b752 AA |
1151 | switch (nlh->nlmsg_type) { |
1152 | case ISCSI_UEVENT_CREATE_SESSION: | |
1153 | err = iscsi_if_create_session(priv, ev); | |
1154 | break; | |
1155 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1156 | session = iscsi_session_lookup(ev->u.d_session.sid); |
26974789 | 1157 | if (session) |
7b7232f3 | 1158 | transport->destroy_session(session); |
26974789 MC |
1159 | else |
1160 | err = -EINVAL; | |
1161 | break; | |
1162 | case ISCSI_UEVENT_UNBIND_SESSION: | |
1163 | session = iscsi_session_lookup(ev->u.d_session.sid); | |
1164 | if (session) | |
1165 | iscsi_unbind_session(session); | |
1166 | else | |
7b7232f3 | 1167 | err = -EINVAL; |
0896b752 AA |
1168 | break; |
1169 | case ISCSI_UEVENT_CREATE_CONN: | |
1170 | err = iscsi_if_create_conn(transport, ev); | |
1171 | break; | |
1172 | case ISCSI_UEVENT_DESTROY_CONN: | |
1173 | err = iscsi_if_destroy_conn(transport, ev); | |
1174 | break; | |
1175 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1176 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1177 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1178 | |
1179 | if (session && conn) | |
1180 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1181 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1182 | ev->u.b_conn.is_leading); |
1183 | else | |
1184 | err = -EINVAL; | |
0896b752 AA |
1185 | break; |
1186 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1187 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1188 | break; |
1189 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1190 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1191 | if (conn) |
1192 | ev->r.retcode = transport->start_conn(conn); | |
1193 | else | |
1194 | err = -EINVAL; | |
0896b752 AA |
1195 | break; |
1196 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1197 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1198 | if (conn) |
1199 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1200 | else | |
1201 | err = -EINVAL; | |
0896b752 AA |
1202 | break; |
1203 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1204 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1205 | if (conn) |
1206 | ev->r.retcode = transport->send_pdu(conn, | |
1207 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1208 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1209 | ev->u.send_pdu.data_size); | |
1210 | else | |
1211 | err = -EINVAL; | |
0896b752 AA |
1212 | break; |
1213 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1214 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1215 | break; |
264faaaa OG |
1216 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1217 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1218 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1219 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1220 | break; | |
01cb225d MC |
1221 | case ISCSI_UEVENT_TGT_DSCVR: |
1222 | err = iscsi_tgt_dscvr(transport, ev); | |
1223 | break; | |
1d9bf13a MC |
1224 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1225 | err = iscsi_set_host_param(transport, ev); | |
1226 | break; | |
0896b752 | 1227 | default: |
1d9bf13a | 1228 | err = -ENOSYS; |
0896b752 AA |
1229 | break; |
1230 | } | |
1231 | ||
7b7232f3 | 1232 | module_put(transport->owner); |
0896b752 AA |
1233 | return err; |
1234 | } | |
1235 | ||
b5c7a12d | 1236 | /* |
cd40b7d3 DL |
1237 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1238 | * Malformed skbs with wrong lengths or invalid creds are not processed. | |
b5c7a12d | 1239 | */ |
0896b752 | 1240 | static void |
cd40b7d3 | 1241 | iscsi_if_rx(struct sk_buff *skb) |
0896b752 | 1242 | { |
0b950672 | 1243 | mutex_lock(&rx_queue_mutex); |
cd40b7d3 DL |
1244 | while (skb->len >= NLMSG_SPACE(0)) { |
1245 | int err; | |
1246 | uint32_t rlen; | |
1247 | struct nlmsghdr *nlh; | |
1248 | struct iscsi_uevent *ev; | |
1249 | ||
1250 | nlh = nlmsg_hdr(skb); | |
1251 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1252 | skb->len < nlh->nlmsg_len) { | |
1253 | break; | |
ee7f8e40 | 1254 | } |
ee7f8e40 | 1255 | |
cd40b7d3 DL |
1256 | ev = NLMSG_DATA(nlh); |
1257 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1258 | if (rlen > skb->len) | |
1259 | rlen = skb->len; | |
0896b752 | 1260 | |
cd40b7d3 DL |
1261 | err = iscsi_if_recv_msg(skb, nlh); |
1262 | if (err) { | |
1263 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1264 | ev->iferror = err; | |
0896b752 | 1265 | } |
cd40b7d3 DL |
1266 | do { |
1267 | /* | |
1268 | * special case for GET_STATS: | |
1269 | * on success - sending reply and stats from | |
1270 | * inside of if_recv_msg(), | |
1271 | * on error - fall through. | |
1272 | */ | |
1273 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1274 | break; | |
1275 | err = iscsi_if_send_reply( | |
1276 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1277 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
1278 | } while (err < 0 && err != -ECONNREFUSED); | |
1279 | skb_pull(skb, rlen); | |
0896b752 | 1280 | } |
0b950672 | 1281 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1282 | } |
1da177e4 | 1283 | |
7b8631b5 MC |
1284 | #define iscsi_cdev_to_conn(_cdev) \ |
1285 | iscsi_dev_to_conn(_cdev->dev) | |
1286 | ||
fd7255f5 MC |
1287 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1288 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1289 | __ATTR(_name,_mode,_show,_store) | |
1290 | ||
1da177e4 | 1291 | /* |
0896b752 | 1292 | * iSCSI connection attrs |
1da177e4 | 1293 | */ |
a54a52ca | 1294 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1295 | static ssize_t \ |
a54a52ca | 1296 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1297 | { \ |
7b8631b5 MC |
1298 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1299 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1300 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1301 | } |
1302 | ||
a54a52ca MC |
1303 | #define iscsi_conn_attr(field, param) \ |
1304 | iscsi_conn_attr_show(param) \ | |
1305 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1306 | NULL); |
0896b752 | 1307 | |
a54a52ca MC |
1308 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1309 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1310 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1311 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1312 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1313 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1314 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1315 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1316 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1317 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1318 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
f6d5180c MC |
1319 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1320 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); | |
1da177e4 | 1321 | |
7b8631b5 MC |
1322 | #define iscsi_cdev_to_session(_cdev) \ |
1323 | iscsi_dev_to_session(_cdev->dev) | |
1324 | ||
1da177e4 | 1325 | /* |
0896b752 | 1326 | * iSCSI session attrs |
1da177e4 | 1327 | */ |
b2c64167 | 1328 | #define iscsi_session_attr_show(param, perm) \ |
fd7255f5 | 1329 | static ssize_t \ |
a54a52ca | 1330 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1331 | { \ |
1332 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1333 | struct iscsi_transport *t = session->transport; \ | |
b2c64167 MC |
1334 | \ |
1335 | if (perm && !capable(CAP_SYS_ADMIN)) \ | |
1336 | return -EACCES; \ | |
a54a52ca | 1337 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1338 | } |
1339 | ||
b2c64167 MC |
1340 | #define iscsi_session_attr(field, param, perm) \ |
1341 | iscsi_session_attr_show(param, perm) \ | |
a54a52ca | 1342 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
fd7255f5 MC |
1343 | NULL); |
1344 | ||
b2c64167 MC |
1345 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1346 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); | |
1347 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); | |
1348 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); | |
1349 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); | |
1350 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); | |
1351 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); | |
1352 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); | |
1353 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); | |
1354 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); | |
1355 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); | |
1356 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); | |
1357 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); | |
1358 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); | |
4cd49ea1 MC |
1359 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1360 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); | |
1361 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); | |
1da177e4 | 1362 | |
6eabafbe MC |
1363 | static ssize_t |
1364 | show_priv_session_state(struct class_device *cdev, char *buf) | |
1365 | { | |
1366 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); | |
1367 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); | |
1368 | } | |
1369 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, | |
1370 | NULL); | |
1371 | ||
fd7255f5 MC |
1372 | #define iscsi_priv_session_attr_show(field, format) \ |
1373 | static ssize_t \ | |
a54a52ca | 1374 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1375 | { \ |
a54a52ca | 1376 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1377 | return sprintf(buf, format"\n", session->field); \ |
1378 | } | |
1379 | ||
1380 | #define iscsi_priv_session_attr(field, format) \ | |
1381 | iscsi_priv_session_attr_show(field, format) \ | |
1382 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1383 | NULL) | |
30a6c652 | 1384 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1385 | |
1819dc81 MC |
1386 | /* |
1387 | * iSCSI host attrs | |
1388 | */ | |
1389 | #define iscsi_host_attr_show(param) \ | |
1390 | static ssize_t \ | |
1391 | show_host_param_##param(struct class_device *cdev, char *buf) \ | |
1392 | { \ | |
1393 | struct Scsi_Host *shost = transport_class_to_shost(cdev); \ | |
1394 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ | |
1395 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ | |
1396 | } | |
1397 | ||
1398 | #define iscsi_host_attr(field, param) \ | |
1399 | iscsi_host_attr_show(param) \ | |
1400 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ | |
1401 | NULL); | |
1402 | ||
d8196ed2 | 1403 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1819dc81 | 1404 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
d8196ed2 | 1405 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
8ad5781a | 1406 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1819dc81 | 1407 | |
fd7255f5 MC |
1408 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1409 | do { \ | |
1410 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1411 | count++; \ | |
1412 | } while (0) | |
1413 | ||
a54a52ca | 1414 | |
fd7255f5 MC |
1415 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1416 | do { \ | |
1417 | if (tt->param_mask & param_flag) { \ | |
1418 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1419 | count++; \ |
fd7255f5 MC |
1420 | } \ |
1421 | } while (0) | |
1422 | ||
fd7255f5 MC |
1423 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1424 | do { \ | |
1425 | if (tt->param_mask & param_flag) { \ | |
1426 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1427 | count++; \ | |
1428 | } \ | |
1429 | } while (0) | |
1da177e4 | 1430 | |
1819dc81 MC |
1431 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1432 | do { \ | |
1433 | if (tt->host_param_mask & param_flag) { \ | |
1434 | priv->host_attrs[count] = &class_device_attr_host_##field; \ | |
1435 | count++; \ | |
1436 | } \ | |
1437 | } while (0) | |
1438 | ||
0896b752 AA |
1439 | static int iscsi_session_match(struct attribute_container *cont, |
1440 | struct device *dev) | |
1da177e4 | 1441 | { |
7b8631b5 | 1442 | struct iscsi_cls_session *session; |
1da177e4 | 1443 | struct Scsi_Host *shost; |
0896b752 AA |
1444 | struct iscsi_internal *priv; |
1445 | ||
1446 | if (!iscsi_is_session_dev(dev)) | |
1447 | return 0; | |
1da177e4 | 1448 | |
7b8631b5 MC |
1449 | session = iscsi_dev_to_session(dev); |
1450 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1451 | if (!shost->transportt) |
1da177e4 LT |
1452 | return 0; |
1453 | ||
0896b752 AA |
1454 | priv = to_iscsi_internal(shost->transportt); |
1455 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1456 | return 0; |
1457 | ||
0896b752 | 1458 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1459 | } |
1460 | ||
0896b752 AA |
1461 | static int iscsi_conn_match(struct attribute_container *cont, |
1462 | struct device *dev) | |
1463 | { | |
7b8631b5 MC |
1464 | struct iscsi_cls_session *session; |
1465 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1466 | struct Scsi_Host *shost; |
0896b752 | 1467 | struct iscsi_internal *priv; |
1da177e4 | 1468 | |
0896b752 | 1469 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1470 | return 0; |
1471 | ||
7b8631b5 MC |
1472 | conn = iscsi_dev_to_conn(dev); |
1473 | session = iscsi_dev_to_session(conn->dev.parent); | |
1474 | shost = iscsi_session_to_shost(session); | |
1475 | ||
0896b752 | 1476 | if (!shost->transportt) |
1da177e4 LT |
1477 | return 0; |
1478 | ||
0896b752 AA |
1479 | priv = to_iscsi_internal(shost->transportt); |
1480 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1481 | return 0; | |
1da177e4 | 1482 | |
0896b752 AA |
1483 | return &priv->conn_cont.ac == cont; |
1484 | } | |
1485 | ||
30a6c652 MC |
1486 | static int iscsi_host_match(struct attribute_container *cont, |
1487 | struct device *dev) | |
1488 | { | |
1489 | struct Scsi_Host *shost; | |
1490 | struct iscsi_internal *priv; | |
1491 | ||
1492 | if (!scsi_is_host_device(dev)) | |
1493 | return 0; | |
1494 | ||
1495 | shost = dev_to_shost(dev); | |
1496 | if (!shost->transportt || | |
1497 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1498 | return 0; | |
1499 | ||
1500 | priv = to_iscsi_internal(shost->transportt); | |
1501 | return &priv->t.host_attrs.ac == cont; | |
1502 | } | |
1503 | ||
7b8631b5 MC |
1504 | struct scsi_transport_template * |
1505 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1506 | { |
1507 | struct iscsi_internal *priv; | |
1508 | unsigned long flags; | |
1509 | int count = 0, err; | |
1510 | ||
1511 | BUG_ON(!tt); | |
1512 | ||
1513 | priv = iscsi_if_transport_lookup(tt); | |
1514 | if (priv) | |
7b8631b5 | 1515 | return NULL; |
0896b752 | 1516 | |
24669f75 | 1517 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1518 | if (!priv) |
7b8631b5 | 1519 | return NULL; |
0896b752 | 1520 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1521 | priv->daemon_pid = -1; |
0896b752 | 1522 | priv->iscsi_transport = tt; |
30a6c652 | 1523 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1524 | |
1525 | priv->cdev.class = &iscsi_transport_class; | |
1526 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1527 | err = class_device_register(&priv->cdev); | |
1528 | if (err) | |
1529 | goto free_priv; | |
1530 | ||
1531 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1532 | if (err) | |
1533 | goto unregister_cdev; | |
1534 | ||
30a6c652 MC |
1535 | /* host parameters */ |
1536 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1537 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1538 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1539 | priv->t.host_size = sizeof(struct iscsi_host); | |
30a6c652 MC |
1540 | transport_container_register(&priv->t.host_attrs); |
1541 | ||
d8196ed2 | 1542 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
22236961 | 1543 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1819dc81 | 1544 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
8ad5781a | 1545 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1819dc81 MC |
1546 | BUG_ON(count > ISCSI_HOST_ATTRS); |
1547 | priv->host_attrs[count] = NULL; | |
1548 | count = 0; | |
1549 | ||
0896b752 AA |
1550 | /* connection parameters */ |
1551 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1552 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1553 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1554 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1555 | |
fd7255f5 MC |
1556 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1557 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1558 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1559 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1560 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1561 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1562 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1563 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1564 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1565 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1566 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
f6d5180c MC |
1567 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
1568 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); | |
0896b752 AA |
1569 | |
1570 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1571 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1572 | count = 0; |
1da177e4 | 1573 | |
0896b752 AA |
1574 | /* session parameters */ |
1575 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1576 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1577 | priv->session_cont.ac.match = iscsi_session_match; | |
1578 | transport_container_register(&priv->session_cont); | |
1579 | ||
fd7255f5 MC |
1580 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1581 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1582 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1583 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1584 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1585 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1586 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1587 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1588 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1589 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
b2c64167 MC |
1590 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
1591 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); | |
1592 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); | |
1593 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); | |
843c0a8a | 1594 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
4cd49ea1 MC |
1595 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
1596 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); | |
30a6c652 | 1597 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
6eabafbe | 1598 | SETUP_PRIV_SESSION_RD_ATTR(state); |
fd7255f5 | 1599 | |
0896b752 AA |
1600 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1601 | priv->session_attrs[count] = NULL; | |
1602 | ||
1603 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1604 | list_add(&priv->list, &iscsi_transports); | |
1605 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1606 | ||
1607 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1608 | return &priv->t; |
1da177e4 | 1609 | |
0896b752 AA |
1610 | unregister_cdev: |
1611 | class_device_unregister(&priv->cdev); | |
1612 | free_priv: | |
1613 | kfree(priv); | |
7b8631b5 | 1614 | return NULL; |
1da177e4 | 1615 | } |
0896b752 AA |
1616 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1617 | ||
1618 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1619 | { | |
1620 | struct iscsi_internal *priv; | |
1621 | unsigned long flags; | |
1622 | ||
1623 | BUG_ON(!tt); | |
1624 | ||
0b950672 | 1625 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1626 | |
1627 | priv = iscsi_if_transport_lookup(tt); | |
1628 | BUG_ON (!priv); | |
1629 | ||
0896b752 AA |
1630 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1631 | list_del(&priv->list); | |
1632 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1633 | ||
1634 | transport_container_unregister(&priv->conn_cont); | |
1635 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1636 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1637 | |
1638 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1639 | class_device_unregister(&priv->cdev); | |
0b950672 | 1640 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1641 | |
0896b752 AA |
1642 | return 0; |
1643 | } | |
1644 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1645 | |
1da177e4 LT |
1646 | static __init int iscsi_transport_init(void) |
1647 | { | |
0896b752 | 1648 | int err; |
1da177e4 | 1649 | |
09492605 | 1650 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
f4246b33 MC |
1651 | ISCSI_TRANSPORT_VERSION); |
1652 | ||
41be1444 MC |
1653 | atomic_set(&iscsi_session_nr, 0); |
1654 | ||
0896b752 | 1655 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1656 | if (err) |
1657 | return err; | |
0896b752 | 1658 | |
30a6c652 | 1659 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1660 | if (err) |
1661 | goto unregister_transport_class; | |
1662 | ||
30a6c652 MC |
1663 | err = transport_class_register(&iscsi_connection_class); |
1664 | if (err) | |
1665 | goto unregister_host_class; | |
1666 | ||
0896b752 AA |
1667 | err = transport_class_register(&iscsi_session_class); |
1668 | if (err) | |
1669 | goto unregister_conn_class; | |
1670 | ||
b4b51029 | 1671 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, |
7b8631b5 | 1672 | THIS_MODULE); |
0896b752 AA |
1673 | if (!nls) { |
1674 | err = -ENOBUFS; | |
43a145a3 | 1675 | goto unregister_session_class; |
0896b752 AA |
1676 | } |
1677 | ||
d8bf541e MC |
1678 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
1679 | if (!iscsi_eh_timer_workq) | |
1680 | goto release_nls; | |
1681 | ||
43a145a3 | 1682 | return 0; |
0896b752 | 1683 | |
d8bf541e | 1684 | release_nls: |
b7c6ba6e | 1685 | netlink_kernel_release(nls); |
0896b752 AA |
1686 | unregister_session_class: |
1687 | transport_class_unregister(&iscsi_session_class); | |
1688 | unregister_conn_class: | |
1689 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1690 | unregister_host_class: |
1691 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1692 | unregister_transport_class: |
1693 | class_unregister(&iscsi_transport_class); | |
1694 | return err; | |
1da177e4 LT |
1695 | } |
1696 | ||
1697 | static void __exit iscsi_transport_exit(void) | |
1698 | { | |
d8bf541e | 1699 | destroy_workqueue(iscsi_eh_timer_workq); |
b7c6ba6e | 1700 | netlink_kernel_release(nls); |
0896b752 AA |
1701 | transport_class_unregister(&iscsi_connection_class); |
1702 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1703 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1704 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | module_init(iscsi_transport_init); | |
1708 | module_exit(iscsi_transport_exit); | |
1709 | ||
0896b752 AA |
1710 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1711 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1712 | "Alex Aizman <itn780@yahoo.com>"); | |
1713 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1714 | MODULE_LICENSE("GPL"); |
f4246b33 | 1715 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |