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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 |
c238c3bb | 34 | #define ISCSI_CONN_ATTRS 13 |
d8196ed2 | 35 | #define ISCSI_HOST_ATTRS 4 |
31ed0bf4 | 36 | #define ISCSI_TRANSPORT_VERSION "2.0-869" |
1da177e4 LT |
37 | |
38 | struct iscsi_internal { | |
790f39a2 | 39 | int daemon_pid; |
1da177e4 | 40 | struct scsi_transport_template t; |
0896b752 AA |
41 | struct iscsi_transport *iscsi_transport; |
42 | struct list_head list; | |
ee959b00 | 43 | struct device dev; |
30a6c652 | 44 | |
ee959b00 | 45 | struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; |
0896b752 | 46 | struct transport_container conn_cont; |
ee959b00 | 47 | struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; |
0896b752 | 48 | struct transport_container session_cont; |
ee959b00 | 49 | struct 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 | ||
ee959b00 TJ |
66 | #define dev_to_iscsi_internal(_dev) \ |
67 | container_of(_dev, struct iscsi_internal, dev) | |
0896b752 | 68 | |
ee959b00 | 69 | static void iscsi_transport_release(struct device *dev) |
0896b752 | 70 | { |
ee959b00 | 71 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); |
0896b752 AA |
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", | |
ee959b00 | 81 | .dev_release = iscsi_transport_release, |
0896b752 AA |
82 | }; |
83 | ||
84 | static ssize_t | |
ee959b00 TJ |
85 | show_transport_handle(struct device *dev, struct device_attribute *attr, |
86 | char *buf) | |
0896b752 | 87 | { |
ee959b00 | 88 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); |
762e2bfa | 89 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 | 90 | } |
ee959b00 | 91 | static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); |
0896b752 AA |
92 | |
93 | #define show_transport_attr(name, format) \ | |
94 | static ssize_t \ | |
ee959b00 TJ |
95 | show_transport_##name(struct device *dev, \ |
96 | struct device_attribute *attr,char *buf) \ | |
0896b752 | 97 | { \ |
ee959b00 | 98 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \ |
0896b752 AA |
99 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ |
100 | } \ | |
ee959b00 | 101 | static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); |
0896b752 AA |
102 | |
103 | show_transport_attr(caps, "0x%x"); | |
104 | show_transport_attr(max_lun, "%d"); | |
105 | show_transport_attr(max_conn, "%d"); | |
106 | show_transport_attr(max_cmd_len, "%d"); | |
107 | ||
108 | static struct attribute *iscsi_transport_attrs[] = { | |
ee959b00 TJ |
109 | &dev_attr_handle.attr, |
110 | &dev_attr_caps.attr, | |
111 | &dev_attr_max_lun.attr, | |
112 | &dev_attr_max_conn.attr, | |
113 | &dev_attr_max_cmd_len.attr, | |
0896b752 AA |
114 | NULL, |
115 | }; | |
116 | ||
117 | static struct attribute_group iscsi_transport_group = { | |
118 | .attrs = iscsi_transport_attrs, | |
119 | }; | |
120 | ||
26974789 MC |
121 | |
122 | ||
30a6c652 | 123 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
ee959b00 | 124 | struct device *cdev) |
30a6c652 MC |
125 | { |
126 | struct Scsi_Host *shost = dev_to_shost(dev); | |
127 | struct iscsi_host *ihost = shost->shost_data; | |
128 | ||
129 | memset(ihost, 0, sizeof(*ihost)); | |
130 | INIT_LIST_HEAD(&ihost->sessions); | |
131 | mutex_init(&ihost->mutex); | |
8aae18ad | 132 | atomic_set(&ihost->nr_scans, 0); |
26974789 | 133 | |
bd976f62 | 134 | snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d", |
26974789 | 135 | shost->host_no); |
bd976f62 MC |
136 | ihost->scan_workq = create_singlethread_workqueue( |
137 | ihost->scan_workq_name); | |
138 | if (!ihost->scan_workq) | |
26974789 MC |
139 | return -ENOMEM; |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int iscsi_remove_host(struct transport_container *tc, struct device *dev, | |
ee959b00 | 144 | struct device *cdev) |
26974789 MC |
145 | { |
146 | struct Scsi_Host *shost = dev_to_shost(dev); | |
147 | struct iscsi_host *ihost = shost->shost_data; | |
148 | ||
bd976f62 | 149 | destroy_workqueue(ihost->scan_workq); |
30a6c652 MC |
150 | return 0; |
151 | } | |
152 | ||
153 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
154 | "iscsi_host", | |
155 | iscsi_setup_host, | |
26974789 | 156 | iscsi_remove_host, |
30a6c652 MC |
157 | NULL); |
158 | ||
0896b752 AA |
159 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
160 | "iscsi_session", | |
1da177e4 LT |
161 | NULL, |
162 | NULL, | |
163 | NULL); | |
164 | ||
0896b752 AA |
165 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
166 | "iscsi_connection", | |
1da177e4 LT |
167 | NULL, |
168 | NULL, | |
169 | NULL); | |
0896b752 AA |
170 | |
171 | static struct sock *nls; | |
0b950672 | 172 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 | 173 | |
7b7232f3 MC |
174 | static LIST_HEAD(sesslist); |
175 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
176 | static LIST_HEAD(connlist); |
177 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 178 | |
b5c7a12d MC |
179 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
180 | { | |
181 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
182 | return sess->sid; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Returns the matching session to a given sid | |
187 | */ | |
188 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
189 | { |
190 | unsigned long flags; | |
191 | struct iscsi_cls_session *sess; | |
192 | ||
193 | spin_lock_irqsave(&sesslock, flags); | |
194 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 195 | if (sess->sid == sid) { |
7b7232f3 MC |
196 | spin_unlock_irqrestore(&sesslock, flags); |
197 | return sess; | |
198 | } | |
199 | } | |
200 | spin_unlock_irqrestore(&sesslock, flags); | |
201 | return NULL; | |
202 | } | |
203 | ||
b5c7a12d MC |
204 | /* |
205 | * Returns the matching connection to a given sid / cid tuple | |
206 | */ | |
207 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
208 | { |
209 | unsigned long flags; | |
210 | struct iscsi_cls_conn *conn; | |
211 | ||
212 | spin_lock_irqsave(&connlock, flags); | |
213 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 214 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
215 | spin_unlock_irqrestore(&connlock, flags); |
216 | return conn; | |
217 | } | |
218 | } | |
219 | spin_unlock_irqrestore(&connlock, flags); | |
220 | return NULL; | |
221 | } | |
222 | ||
7b8631b5 MC |
223 | /* |
224 | * The following functions can be used by LLDs that allocate | |
225 | * their own scsi_hosts or by software iscsi LLDs | |
226 | */ | |
6eabafbe MC |
227 | static struct { |
228 | int value; | |
229 | char *name; | |
230 | } iscsi_session_state_names[] = { | |
231 | { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" }, | |
232 | { ISCSI_SESSION_FAILED, "FAILED" }, | |
233 | { ISCSI_SESSION_FREE, "FREE" }, | |
234 | }; | |
235 | ||
3b0f208a | 236 | static const char *iscsi_session_state_name(int state) |
6eabafbe MC |
237 | { |
238 | int i; | |
239 | char *name = NULL; | |
240 | ||
241 | for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { | |
242 | if (iscsi_session_state_names[i].value == state) { | |
243 | name = iscsi_session_state_names[i].name; | |
244 | break; | |
245 | } | |
246 | } | |
247 | return name; | |
248 | } | |
249 | ||
250 | int iscsi_session_chkready(struct iscsi_cls_session *session) | |
251 | { | |
252 | unsigned long flags; | |
253 | int err; | |
254 | ||
255 | spin_lock_irqsave(&session->lock, flags); | |
256 | switch (session->state) { | |
257 | case ISCSI_SESSION_LOGGED_IN: | |
258 | err = 0; | |
259 | break; | |
260 | case ISCSI_SESSION_FAILED: | |
261 | err = DID_IMM_RETRY << 16; | |
262 | break; | |
263 | case ISCSI_SESSION_FREE: | |
264 | err = DID_NO_CONNECT << 16; | |
265 | break; | |
266 | default: | |
267 | err = DID_NO_CONNECT << 16; | |
268 | break; | |
269 | } | |
270 | spin_unlock_irqrestore(&session->lock, flags); | |
271 | return err; | |
272 | } | |
273 | EXPORT_SYMBOL_GPL(iscsi_session_chkready); | |
274 | ||
7b8631b5 MC |
275 | static void iscsi_session_release(struct device *dev) |
276 | { | |
277 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 278 | struct Scsi_Host *shost; |
0896b752 | 279 | |
7b8631b5 MC |
280 | shost = iscsi_session_to_shost(session); |
281 | scsi_host_put(shost); | |
282 | kfree(session); | |
7b8631b5 | 283 | } |
0896b752 | 284 | |
7b8631b5 MC |
285 | static int iscsi_is_session_dev(const struct device *dev) |
286 | { | |
287 | return dev->release == iscsi_session_release; | |
288 | } | |
0896b752 | 289 | |
8aae18ad MC |
290 | /** |
291 | * iscsi_scan_finished - helper to report when running scans are done | |
292 | * @shost: scsi host | |
293 | * @time: scan run time | |
294 | * | |
295 | * This function can be used by drives like qla4xxx to report to the scsi | |
296 | * layer when the scans it kicked off at module load time are done. | |
297 | */ | |
298 | int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time) | |
299 | { | |
300 | struct iscsi_host *ihost = shost->shost_data; | |
301 | /* | |
302 | * qla4xxx will have kicked off some session unblocks before calling | |
303 | * scsi_scan_host, so just wait for them to complete. | |
304 | */ | |
305 | return !atomic_read(&ihost->nr_scans); | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(iscsi_scan_finished); | |
308 | ||
30a6c652 MC |
309 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
310 | uint id, uint lun) | |
311 | { | |
312 | struct iscsi_host *ihost = shost->shost_data; | |
313 | struct iscsi_cls_session *session; | |
314 | ||
315 | mutex_lock(&ihost->mutex); | |
316 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
e6f3b63f | 317 | if ((channel == SCAN_WILD_CARD || channel == 0) && |
30a6c652 | 318 | (id == SCAN_WILD_CARD || id == session->target_id)) |
e6f3b63f | 319 | scsi_scan_target(&session->dev, 0, |
30a6c652 MC |
320 | session->target_id, lun, 1); |
321 | } | |
322 | mutex_unlock(&ihost->mutex); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
bd976f62 MC |
327 | static void iscsi_scan_session(struct work_struct *work) |
328 | { | |
329 | struct iscsi_cls_session *session = | |
330 | container_of(work, struct iscsi_cls_session, scan_work); | |
8aae18ad MC |
331 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
332 | struct iscsi_host *ihost = shost->shost_data; | |
bd976f62 MC |
333 | unsigned long flags; |
334 | ||
335 | spin_lock_irqsave(&session->lock, flags); | |
336 | if (session->state != ISCSI_SESSION_LOGGED_IN) { | |
337 | spin_unlock_irqrestore(&session->lock, flags); | |
8aae18ad | 338 | goto done; |
bd976f62 MC |
339 | } |
340 | spin_unlock_irqrestore(&session->lock, flags); | |
341 | ||
342 | scsi_scan_target(&session->dev, 0, session->target_id, | |
343 | SCAN_WILD_CARD, 1); | |
8aae18ad MC |
344 | done: |
345 | atomic_dec(&ihost->nr_scans); | |
bd976f62 MC |
346 | } |
347 | ||
c4028958 | 348 | static void session_recovery_timedout(struct work_struct *work) |
30a6c652 | 349 | { |
c4028958 DH |
350 | struct iscsi_cls_session *session = |
351 | container_of(work, struct iscsi_cls_session, | |
352 | recovery_work.work); | |
6eabafbe | 353 | unsigned long flags; |
30a6c652 | 354 | |
322d739d MC |
355 | iscsi_cls_session_printk(KERN_INFO, session, |
356 | "session recovery timed out after %d secs\n", | |
357 | session->recovery_tmo); | |
30a6c652 | 358 | |
6eabafbe MC |
359 | spin_lock_irqsave(&session->lock, flags); |
360 | switch (session->state) { | |
361 | case ISCSI_SESSION_FAILED: | |
362 | session->state = ISCSI_SESSION_FREE; | |
363 | break; | |
364 | case ISCSI_SESSION_LOGGED_IN: | |
365 | case ISCSI_SESSION_FREE: | |
366 | /* we raced with the unblock's flush */ | |
367 | spin_unlock_irqrestore(&session->lock, flags); | |
368 | return; | |
369 | } | |
370 | spin_unlock_irqrestore(&session->lock, flags); | |
371 | ||
30a6c652 MC |
372 | if (session->transport->session_recovery_timedout) |
373 | session->transport->session_recovery_timedout(session); | |
374 | ||
375 | scsi_target_unblock(&session->dev); | |
376 | } | |
377 | ||
45ab33b6 | 378 | static void __iscsi_unblock_session(struct work_struct *work) |
6eabafbe | 379 | { |
45ab33b6 MC |
380 | struct iscsi_cls_session *session = |
381 | container_of(work, struct iscsi_cls_session, | |
382 | unblock_work); | |
bd976f62 MC |
383 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
384 | struct iscsi_host *ihost = shost->shost_data; | |
6eabafbe MC |
385 | unsigned long flags; |
386 | ||
45ab33b6 MC |
387 | /* |
388 | * The recovery and unblock work get run from the same workqueue, | |
389 | * so try to cancel it if it was going to run after this unblock. | |
390 | */ | |
391 | cancel_delayed_work(&session->recovery_work); | |
6eabafbe MC |
392 | spin_lock_irqsave(&session->lock, flags); |
393 | session->state = ISCSI_SESSION_LOGGED_IN; | |
394 | spin_unlock_irqrestore(&session->lock, flags); | |
45ab33b6 MC |
395 | /* start IO */ |
396 | scsi_target_unblock(&session->dev); | |
8aae18ad MC |
397 | /* |
398 | * Only do kernel scanning if the driver is properly hooked into | |
399 | * the async scanning code (drivers like iscsi_tcp do login and | |
400 | * scanning from userspace). | |
401 | */ | |
402 | if (shost->hostt->scan_finished) { | |
403 | if (queue_work(ihost->scan_workq, &session->scan_work)) | |
404 | atomic_inc(&ihost->nr_scans); | |
405 | } | |
6eabafbe | 406 | } |
45ab33b6 MC |
407 | |
408 | /** | |
409 | * iscsi_unblock_session - set a session as logged in and start IO. | |
410 | * @session: iscsi session | |
411 | * | |
412 | * Mark a session as ready to accept IO. | |
413 | */ | |
414 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
415 | { | |
416 | queue_work(iscsi_eh_timer_workq, &session->unblock_work); | |
417 | /* | |
418 | * make sure all the events have completed before tell the driver | |
419 | * it is safe | |
420 | */ | |
421 | flush_workqueue(iscsi_eh_timer_workq); | |
422 | } | |
30a6c652 MC |
423 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
424 | ||
45ab33b6 | 425 | static void __iscsi_block_session(struct work_struct *work) |
30a6c652 | 426 | { |
45ab33b6 MC |
427 | struct iscsi_cls_session *session = |
428 | container_of(work, struct iscsi_cls_session, | |
429 | block_work); | |
6eabafbe MC |
430 | unsigned long flags; |
431 | ||
432 | spin_lock_irqsave(&session->lock, flags); | |
433 | session->state = ISCSI_SESSION_FAILED; | |
434 | spin_unlock_irqrestore(&session->lock, flags); | |
30a6c652 | 435 | scsi_target_block(&session->dev); |
d8bf541e MC |
436 | queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, |
437 | session->recovery_tmo * HZ); | |
30a6c652 | 438 | } |
45ab33b6 MC |
439 | |
440 | void iscsi_block_session(struct iscsi_cls_session *session) | |
441 | { | |
442 | queue_work(iscsi_eh_timer_workq, &session->block_work); | |
443 | } | |
30a6c652 MC |
444 | EXPORT_SYMBOL_GPL(iscsi_block_session); |
445 | ||
26974789 MC |
446 | static void __iscsi_unbind_session(struct work_struct *work) |
447 | { | |
448 | struct iscsi_cls_session *session = | |
449 | container_of(work, struct iscsi_cls_session, | |
450 | unbind_work); | |
451 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
452 | struct iscsi_host *ihost = shost->shost_data; | |
453 | ||
454 | /* Prevent new scans and make sure scanning is not in progress */ | |
455 | mutex_lock(&ihost->mutex); | |
456 | if (list_empty(&session->host_list)) { | |
457 | mutex_unlock(&ihost->mutex); | |
458 | return; | |
459 | } | |
460 | list_del_init(&session->host_list); | |
461 | mutex_unlock(&ihost->mutex); | |
462 | ||
463 | scsi_remove_target(&session->dev); | |
464 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); | |
465 | } | |
466 | ||
467 | static int iscsi_unbind_session(struct iscsi_cls_session *session) | |
468 | { | |
469 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
470 | struct iscsi_host *ihost = shost->shost_data; | |
471 | ||
bd976f62 | 472 | return queue_work(ihost->scan_workq, &session->unbind_work); |
26974789 MC |
473 | } |
474 | ||
7b8631b5 | 475 | struct iscsi_cls_session * |
8434aa8b MC |
476 | iscsi_alloc_session(struct Scsi_Host *shost, |
477 | struct iscsi_transport *transport) | |
7b8631b5 MC |
478 | { |
479 | struct iscsi_cls_session *session; | |
7b8631b5 | 480 | |
b5c7a12d MC |
481 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
482 | GFP_KERNEL); | |
7b8631b5 | 483 | if (!session) |
f53a88da MC |
484 | return NULL; |
485 | ||
7b8631b5 | 486 | session->transport = transport; |
30a6c652 | 487 | session->recovery_tmo = 120; |
6eabafbe | 488 | session->state = ISCSI_SESSION_FREE; |
c4028958 | 489 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
30a6c652 MC |
490 | INIT_LIST_HEAD(&session->host_list); |
491 | INIT_LIST_HEAD(&session->sess_list); | |
45ab33b6 MC |
492 | INIT_WORK(&session->unblock_work, __iscsi_unblock_session); |
493 | INIT_WORK(&session->block_work, __iscsi_block_session); | |
26974789 | 494 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
bd976f62 | 495 | INIT_WORK(&session->scan_work, iscsi_scan_session); |
6eabafbe | 496 | spin_lock_init(&session->lock); |
7b8631b5 | 497 | |
6a8a0d36 MC |
498 | /* this is released in the dev's release function */ |
499 | scsi_host_get(shost); | |
8434aa8b MC |
500 | session->dev.parent = &shost->shost_gendev; |
501 | session->dev.release = iscsi_session_release; | |
502 | device_initialize(&session->dev); | |
b5c7a12d MC |
503 | if (transport->sessiondata_size) |
504 | session->dd_data = &session[1]; | |
8434aa8b MC |
505 | return session; |
506 | } | |
507 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
508 | ||
6a8a0d36 | 509 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
510 | { |
511 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
512 | struct iscsi_host *ihost; | |
26974789 | 513 | unsigned long flags; |
8434aa8b | 514 | int err; |
b5c7a12d | 515 | |
30a6c652 | 516 | ihost = shost->shost_data; |
41be1444 | 517 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
6a8a0d36 | 518 | session->target_id = target_id; |
30a6c652 | 519 | |
b5c7a12d MC |
520 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
521 | session->sid); | |
8434aa8b | 522 | err = device_add(&session->dev); |
7b8631b5 | 523 | if (err) { |
322d739d MC |
524 | iscsi_cls_session_printk(KERN_ERR, session, |
525 | "could not register session's dev\n"); | |
8434aa8b | 526 | goto release_host; |
7b8631b5 MC |
527 | } |
528 | transport_register_device(&session->dev); | |
529 | ||
26974789 MC |
530 | spin_lock_irqsave(&sesslock, flags); |
531 | list_add(&session->sess_list, &sesslist); | |
532 | spin_unlock_irqrestore(&sesslock, flags); | |
533 | ||
30a6c652 MC |
534 | mutex_lock(&ihost->mutex); |
535 | list_add(&session->host_list, &ihost->sessions); | |
536 | mutex_unlock(&ihost->mutex); | |
26974789 MC |
537 | |
538 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); | |
8434aa8b | 539 | return 0; |
30a6c652 | 540 | |
8434aa8b MC |
541 | release_host: |
542 | scsi_host_put(shost); | |
543 | return err; | |
7b8631b5 | 544 | } |
8434aa8b | 545 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
546 | |
547 | /** | |
8434aa8b MC |
548 | * iscsi_create_session - create iscsi class session |
549 | * @shost: scsi host | |
550 | * @transport: iscsi transport | |
eb44820c | 551 | * @target_id: which target |
7b8631b5 | 552 | * |
8434aa8b | 553 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 554 | */ |
8434aa8b MC |
555 | struct iscsi_cls_session * |
556 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
557 | struct iscsi_transport *transport, |
558 | unsigned int target_id) | |
8434aa8b MC |
559 | { |
560 | struct iscsi_cls_session *session; | |
561 | ||
562 | session = iscsi_alloc_session(shost, transport); | |
563 | if (!session) | |
564 | return NULL; | |
565 | ||
6a8a0d36 | 566 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
567 | iscsi_free_session(session); |
568 | return NULL; | |
569 | } | |
570 | return session; | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
573 | ||
26974789 MC |
574 | static void iscsi_conn_release(struct device *dev) |
575 | { | |
576 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
577 | struct device *parent = conn->dev.parent; | |
578 | ||
579 | kfree(conn); | |
580 | put_device(parent); | |
581 | } | |
582 | ||
583 | static int iscsi_is_conn_dev(const struct device *dev) | |
584 | { | |
585 | return dev->release == iscsi_conn_release; | |
586 | } | |
587 | ||
588 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) | |
589 | { | |
590 | if (!iscsi_is_conn_dev(dev)) | |
591 | return 0; | |
592 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); | |
593 | } | |
594 | ||
8434aa8b | 595 | void iscsi_remove_session(struct iscsi_cls_session *session) |
7b8631b5 | 596 | { |
30a6c652 MC |
597 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
598 | struct iscsi_host *ihost = shost->shost_data; | |
26974789 MC |
599 | unsigned long flags; |
600 | int err; | |
601 | ||
602 | spin_lock_irqsave(&sesslock, flags); | |
603 | list_del(&session->sess_list); | |
604 | spin_unlock_irqrestore(&sesslock, flags); | |
30a6c652 | 605 | |
45ab33b6 MC |
606 | /* make sure there are no blocks/unblocks queued */ |
607 | flush_workqueue(iscsi_eh_timer_workq); | |
608 | /* make sure the timedout callout is not running */ | |
609 | if (!cancel_delayed_work(&session->recovery_work)) | |
610 | flush_workqueue(iscsi_eh_timer_workq); | |
26974789 MC |
611 | /* |
612 | * If we are blocked let commands flow again. The lld or iscsi | |
613 | * layer should set up the queuecommand to fail commands. | |
45ab33b6 MC |
614 | * We assume that LLD will not be calling block/unblock while |
615 | * removing the session. | |
26974789 | 616 | */ |
6eabafbe MC |
617 | spin_lock_irqsave(&session->lock, flags); |
618 | session->state = ISCSI_SESSION_FREE; | |
619 | spin_unlock_irqrestore(&session->lock, flags); | |
bd976f62 | 620 | |
45ab33b6 MC |
621 | scsi_target_unblock(&session->dev); |
622 | /* flush running scans then delete devices */ | |
bd976f62 | 623 | flush_workqueue(ihost->scan_workq); |
45ab33b6 | 624 | __iscsi_unbind_session(&session->unbind_work); |
30a6c652 | 625 | |
26974789 MC |
626 | /* hw iscsi may not have removed all connections from session */ |
627 | err = device_for_each_child(&session->dev, NULL, | |
628 | iscsi_iter_destroy_conn_fn); | |
629 | if (err) | |
322d739d MC |
630 | iscsi_cls_session_printk(KERN_ERR, session, |
631 | "Could not delete all connections " | |
632 | "for session. Error %d.\n", err); | |
8434aa8b | 633 | |
7b8631b5 | 634 | transport_unregister_device(&session->dev); |
8434aa8b MC |
635 | device_del(&session->dev); |
636 | } | |
637 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
638 | ||
639 | void iscsi_free_session(struct iscsi_cls_session *session) | |
640 | { | |
26974789 | 641 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
8434aa8b | 642 | put_device(&session->dev); |
7b8631b5 | 643 | } |
8434aa8b MC |
644 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
645 | ||
646 | /** | |
647 | * iscsi_destroy_session - destroy iscsi session | |
648 | * @session: iscsi_session | |
649 | * | |
650 | * Can be called by a LLD or iscsi_transport. There must not be | |
651 | * any running connections. | |
eb44820c | 652 | */ |
8434aa8b MC |
653 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
654 | { | |
655 | iscsi_remove_session(session); | |
656 | iscsi_free_session(session); | |
657 | return 0; | |
658 | } | |
7b8631b5 MC |
659 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
660 | ||
7b8631b5 MC |
661 | /** |
662 | * iscsi_create_conn - create iscsi class connection | |
663 | * @session: iscsi cls session | |
664 | * @cid: connection id | |
665 | * | |
666 | * This can be called from a LLD or iscsi_transport. The connection | |
667 | * is child of the session so cid must be unique for all connections | |
668 | * on the session. | |
b5c7a12d MC |
669 | * |
670 | * Since we do not support MCS, cid will normally be zero. In some cases | |
671 | * for software iscsi we could be trying to preallocate a connection struct | |
672 | * in which case there could be two connection structs and cid would be | |
673 | * non-zero. | |
eb44820c | 674 | */ |
7b8631b5 MC |
675 | struct iscsi_cls_conn * |
676 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
677 | { | |
678 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 | 679 | struct iscsi_cls_conn *conn; |
26974789 | 680 | unsigned long flags; |
7b8631b5 MC |
681 | int err; |
682 | ||
683 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
684 | if (!conn) | |
685 | return NULL; | |
686 | ||
687 | if (transport->conndata_size) | |
688 | conn->dd_data = &conn[1]; | |
689 | ||
690 | INIT_LIST_HEAD(&conn->conn_list); | |
691 | conn->transport = transport; | |
b5c7a12d | 692 | conn->cid = cid; |
7b8631b5 MC |
693 | |
694 | /* this is released in the dev's release function */ | |
695 | if (!get_device(&session->dev)) | |
43a145a3 | 696 | goto free_conn; |
b5c7a12d | 697 | |
7b8631b5 | 698 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 699 | session->sid, cid); |
7b8631b5 MC |
700 | conn->dev.parent = &session->dev; |
701 | conn->dev.release = iscsi_conn_release; | |
702 | err = device_register(&conn->dev); | |
703 | if (err) { | |
322d739d MC |
704 | iscsi_cls_session_printk(KERN_ERR, session, "could not " |
705 | "register connection's dev\n"); | |
7b8631b5 MC |
706 | goto release_parent_ref; |
707 | } | |
708 | transport_register_device(&conn->dev); | |
26974789 MC |
709 | |
710 | spin_lock_irqsave(&connlock, flags); | |
711 | list_add(&conn->conn_list, &connlist); | |
712 | conn->active = 1; | |
713 | spin_unlock_irqrestore(&connlock, flags); | |
7b8631b5 MC |
714 | return conn; |
715 | ||
716 | release_parent_ref: | |
717 | put_device(&session->dev); | |
718 | free_conn: | |
719 | kfree(conn); | |
720 | return NULL; | |
721 | } | |
722 | ||
723 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
724 | ||
725 | /** | |
726 | * iscsi_destroy_conn - destroy iscsi class connection | |
eb44820c | 727 | * @conn: iscsi cls session |
7b8631b5 | 728 | * |
26974789 | 729 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 730 | */ |
7b8631b5 MC |
731 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
732 | { | |
26974789 MC |
733 | unsigned long flags; |
734 | ||
735 | spin_lock_irqsave(&connlock, flags); | |
736 | conn->active = 0; | |
737 | list_del(&conn->conn_list); | |
738 | spin_unlock_irqrestore(&connlock, flags); | |
739 | ||
7b8631b5 MC |
740 | transport_unregister_device(&conn->dev); |
741 | device_unregister(&conn->dev); | |
742 | return 0; | |
743 | } | |
7b8631b5 MC |
744 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
745 | ||
7b8631b5 MC |
746 | /* |
747 | * iscsi interface functions | |
748 | */ | |
0896b752 AA |
749 | static struct iscsi_internal * |
750 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
751 | { | |
752 | struct iscsi_internal *priv; | |
753 | unsigned long flags; | |
754 | ||
755 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
756 | list_for_each_entry(priv, &iscsi_transports, list) { | |
757 | if (tt == priv->iscsi_transport) { | |
758 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
759 | return priv; | |
760 | } | |
761 | } | |
762 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
763 | return NULL; | |
764 | } | |
1da177e4 | 765 | |
53cb8a1f | 766 | static int |
43a145a3 | 767 | iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp) |
53cb8a1f | 768 | { |
53cb8a1f MC |
769 | int rc; |
770 | ||
9aaa2b46 | 771 | rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
53cb8a1f | 772 | if (rc < 0) { |
53cb8a1f MC |
773 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); |
774 | return rc; | |
775 | } | |
776 | ||
53cb8a1f MC |
777 | return 0; |
778 | } | |
779 | ||
0896b752 | 780 | static int |
43a145a3 | 781 | iscsi_unicast_skb(struct sk_buff *skb, int pid) |
0896b752 | 782 | { |
0896b752 | 783 | int rc; |
1da177e4 | 784 | |
790f39a2 | 785 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 | 786 | if (rc < 0) { |
0896b752 AA |
787 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); |
788 | return rc; | |
789 | } | |
790 | ||
0896b752 | 791 | return 0; |
1da177e4 | 792 | } |
1da177e4 | 793 | |
7b7232f3 | 794 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 795 | char *data, uint32_t data_size) |
1da177e4 | 796 | { |
0896b752 AA |
797 | struct nlmsghdr *nlh; |
798 | struct sk_buff *skb; | |
799 | struct iscsi_uevent *ev; | |
0896b752 | 800 | char *pdu; |
790f39a2 | 801 | struct iscsi_internal *priv; |
0896b752 AA |
802 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
803 | data_size); | |
804 | ||
790f39a2 MC |
805 | priv = iscsi_if_transport_lookup(conn->transport); |
806 | if (!priv) | |
807 | return -EINVAL; | |
808 | ||
43a145a3 | 809 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 810 | if (!skb) { |
7b7232f3 | 811 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
322d739d MC |
812 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver " |
813 | "control PDU: OOM\n"); | |
0896b752 AA |
814 | return -ENOMEM; |
815 | } | |
1da177e4 | 816 | |
790f39a2 | 817 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
818 | ev = NLMSG_DATA(nlh); |
819 | memset(ev, 0, sizeof(*ev)); | |
820 | ev->transport_handle = iscsi_handle(conn->transport); | |
821 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
b5c7a12d MC |
822 | ev->r.recv_req.cid = conn->cid; |
823 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
824 | pdu = (char*)ev + sizeof(*ev); |
825 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
826 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 827 | |
43a145a3 | 828 | return iscsi_unicast_skb(skb, priv->daemon_pid); |
1da177e4 | 829 | } |
0896b752 | 830 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 831 | |
7b7232f3 | 832 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 833 | { |
0896b752 AA |
834 | struct nlmsghdr *nlh; |
835 | struct sk_buff *skb; | |
836 | struct iscsi_uevent *ev; | |
790f39a2 | 837 | struct iscsi_internal *priv; |
0896b752 AA |
838 | int len = NLMSG_SPACE(sizeof(*ev)); |
839 | ||
790f39a2 MC |
840 | priv = iscsi_if_transport_lookup(conn->transport); |
841 | if (!priv) | |
842 | return; | |
843 | ||
43a145a3 | 844 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 845 | if (!skb) { |
322d739d MC |
846 | iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored " |
847 | "conn error (%d)\n", error); | |
0896b752 AA |
848 | return; |
849 | } | |
850 | ||
790f39a2 | 851 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
852 | ev = NLMSG_DATA(nlh); |
853 | ev->transport_handle = iscsi_handle(conn->transport); | |
854 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
0896b752 | 855 | ev->r.connerror.error = error; |
b5c7a12d MC |
856 | ev->r.connerror.cid = conn->cid; |
857 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 858 | |
43a145a3 | 859 | iscsi_broadcast_skb(skb, GFP_ATOMIC); |
1da177e4 | 860 | |
322d739d MC |
861 | iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n", |
862 | error); | |
0896b752 AA |
863 | } |
864 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
865 | ||
866 | static int | |
867 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
868 | void *payload, int size) | |
869 | { | |
870 | struct sk_buff *skb; | |
871 | struct nlmsghdr *nlh; | |
872 | int len = NLMSG_SPACE(size); | |
873 | int flags = multi ? NLM_F_MULTI : 0; | |
874 | int t = done ? NLMSG_DONE : type; | |
875 | ||
43a145a3 | 876 | skb = alloc_skb(len, GFP_ATOMIC); |
239a7dc2 MC |
877 | if (!skb) { |
878 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); | |
879 | return -ENOMEM; | |
880 | } | |
0896b752 AA |
881 | |
882 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
883 | nlh->nlmsg_flags = flags; | |
884 | memcpy(NLMSG_DATA(nlh), payload, size); | |
43a145a3 | 885 | return iscsi_unicast_skb(skb, pid); |
1da177e4 | 886 | } |
1da177e4 | 887 | |
7b8631b5 | 888 | static int |
5b940adf | 889 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
890 | { |
891 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
892 | struct iscsi_stats *stats; | |
893 | struct sk_buff *skbstat; | |
894 | struct iscsi_cls_conn *conn; | |
895 | struct nlmsghdr *nlhstat; | |
896 | struct iscsi_uevent *evstat; | |
790f39a2 | 897 | struct iscsi_internal *priv; |
7b8631b5 MC |
898 | int len = NLMSG_SPACE(sizeof(*ev) + |
899 | sizeof(struct iscsi_stats) + | |
900 | sizeof(struct iscsi_stats_custom) * | |
901 | ISCSI_STATS_CUSTOM_MAX); | |
902 | int err = 0; | |
0896b752 | 903 | |
790f39a2 MC |
904 | priv = iscsi_if_transport_lookup(transport); |
905 | if (!priv) | |
906 | return -EINVAL; | |
907 | ||
b5c7a12d | 908 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
909 | if (!conn) |
910 | return -EEXIST; | |
0896b752 | 911 | |
7b8631b5 MC |
912 | do { |
913 | int actual_size; | |
0896b752 | 914 | |
43a145a3 | 915 | skbstat = alloc_skb(len, GFP_ATOMIC); |
7b8631b5 | 916 | if (!skbstat) { |
322d739d MC |
917 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not " |
918 | "deliver stats: OOM\n"); | |
7b8631b5 MC |
919 | return -ENOMEM; |
920 | } | |
921 | ||
790f39a2 | 922 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
923 | (len - sizeof(*nlhstat)), 0); |
924 | evstat = NLMSG_DATA(nlhstat); | |
925 | memset(evstat, 0, sizeof(*evstat)); | |
926 | evstat->transport_handle = iscsi_handle(conn->transport); | |
927 | evstat->type = nlh->nlmsg_type; | |
b5c7a12d MC |
928 | evstat->u.get_stats.cid = |
929 | ev->u.get_stats.cid; | |
930 | evstat->u.get_stats.sid = | |
931 | ev->u.get_stats.sid; | |
7b8631b5 MC |
932 | stats = (struct iscsi_stats *) |
933 | ((char*)evstat + sizeof(*evstat)); | |
934 | memset(stats, 0, sizeof(*stats)); | |
935 | ||
7b7232f3 | 936 | transport->get_stats(conn, stats); |
7b8631b5 MC |
937 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
938 | sizeof(struct iscsi_stats) + | |
939 | sizeof(struct iscsi_stats_custom) * | |
940 | stats->custom_length); | |
941 | actual_size -= sizeof(*nlhstat); | |
942 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 943 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
944 | nlhstat->nlmsg_len = actual_size; |
945 | ||
43a145a3 | 946 | err = iscsi_unicast_skb(skbstat, priv->daemon_pid); |
7b8631b5 MC |
947 | } while (err < 0 && err != -ECONNREFUSED); |
948 | ||
949 | return err; | |
0896b752 AA |
950 | } |
951 | ||
53cb8a1f | 952 | /** |
26974789 MC |
953 | * iscsi_session_event - send session destr. completion event |
954 | * @session: iscsi class session | |
955 | * @event: type of event | |
eb44820c | 956 | */ |
26974789 MC |
957 | int iscsi_session_event(struct iscsi_cls_session *session, |
958 | enum iscsi_uevent_e event) | |
53cb8a1f MC |
959 | { |
960 | struct iscsi_internal *priv; | |
53cb8a1f MC |
961 | struct Scsi_Host *shost; |
962 | struct iscsi_uevent *ev; | |
963 | struct sk_buff *skb; | |
964 | struct nlmsghdr *nlh; | |
53cb8a1f MC |
965 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
966 | ||
26974789 | 967 | priv = iscsi_if_transport_lookup(session->transport); |
53cb8a1f MC |
968 | if (!priv) |
969 | return -EINVAL; | |
53cb8a1f MC |
970 | shost = iscsi_session_to_shost(session); |
971 | ||
43a145a3 | 972 | skb = alloc_skb(len, GFP_KERNEL); |
53cb8a1f | 973 | if (!skb) { |
322d739d MC |
974 | iscsi_cls_session_printk(KERN_ERR, session, |
975 | "Cannot notify userspace of session " | |
976 | "event %u\n", event); | |
53cb8a1f MC |
977 | return -ENOMEM; |
978 | } | |
979 | ||
980 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
981 | ev = NLMSG_DATA(nlh); | |
26974789 | 982 | ev->transport_handle = iscsi_handle(session->transport); |
53cb8a1f | 983 | |
26974789 MC |
984 | ev->type = event; |
985 | switch (event) { | |
986 | case ISCSI_KEVENT_DESTROY_SESSION: | |
987 | ev->r.d_session.host_no = shost->host_no; | |
988 | ev->r.d_session.sid = session->sid; | |
989 | break; | |
990 | case ISCSI_KEVENT_CREATE_SESSION: | |
991 | ev->r.c_session_ret.host_no = shost->host_no; | |
992 | ev->r.c_session_ret.sid = session->sid; | |
993 | break; | |
994 | case ISCSI_KEVENT_UNBIND_SESSION: | |
995 | ev->r.unbind_session.host_no = shost->host_no; | |
996 | ev->r.unbind_session.sid = session->sid; | |
997 | break; | |
998 | default: | |
322d739d MC |
999 | iscsi_cls_session_printk(KERN_ERR, session, "Invalid event " |
1000 | "%u.\n", event); | |
26974789 | 1001 | kfree_skb(skb); |
53cb8a1f | 1002 | return -EINVAL; |
53cb8a1f MC |
1003 | } |
1004 | ||
53cb8a1f MC |
1005 | /* |
1006 | * this will occur if the daemon is not up, so we just warn | |
1007 | * the user and when the daemon is restarted it will handle it | |
1008 | */ | |
43a145a3 | 1009 | rc = iscsi_broadcast_skb(skb, GFP_KERNEL); |
53cb8a1f | 1010 | if (rc < 0) |
322d739d MC |
1011 | iscsi_cls_session_printk(KERN_ERR, session, |
1012 | "Cannot notify userspace of session " | |
1013 | "event %u. Check iscsi daemon\n", | |
1014 | event); | |
53cb8a1f MC |
1015 | return rc; |
1016 | } | |
26974789 | 1017 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
53cb8a1f | 1018 | |
0896b752 AA |
1019 | static int |
1020 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
1021 | { | |
1022 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 1023 | struct iscsi_cls_session *session; |
b5c7a12d | 1024 | uint32_t hostno; |
0896b752 | 1025 | |
7996a778 | 1026 | session = transport->create_session(transport, &priv->t, |
1548271e MC |
1027 | ev->u.c_session.cmds_max, |
1028 | ev->u.c_session.queue_depth, | |
7b7232f3 | 1029 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 1030 | &hostno); |
7b7232f3 | 1031 | if (!session) |
7b8631b5 | 1032 | return -ENOMEM; |
0896b752 | 1033 | |
b5c7a12d MC |
1034 | ev->r.c_session_ret.host_no = hostno; |
1035 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 1036 | return 0; |
0896b752 AA |
1037 | } |
1038 | ||
1039 | static int | |
7b7232f3 | 1040 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 1041 | { |
7b8631b5 | 1042 | struct iscsi_cls_conn *conn; |
7b7232f3 | 1043 | struct iscsi_cls_session *session; |
7b8631b5 | 1044 | |
b5c7a12d MC |
1045 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1046 | if (!session) { | |
322d739d | 1047 | printk(KERN_ERR "iscsi: invalid session %d.\n", |
b5c7a12d | 1048 | ev->u.c_conn.sid); |
7b8631b5 | 1049 | return -EINVAL; |
b5c7a12d | 1050 | } |
0896b752 | 1051 | |
7b7232f3 | 1052 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d | 1053 | if (!conn) { |
322d739d MC |
1054 | iscsi_cls_session_printk(KERN_ERR, session, |
1055 | "couldn't create a new connection."); | |
7b7232f3 | 1056 | return -ENOMEM; |
b5c7a12d | 1057 | } |
0896b752 | 1058 | |
b5c7a12d MC |
1059 | ev->r.c_conn_ret.sid = session->sid; |
1060 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 | 1061 | return 0; |
1da177e4 LT |
1062 | } |
1063 | ||
0896b752 AA |
1064 | static int |
1065 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1066 | { | |
7b8631b5 | 1067 | struct iscsi_cls_conn *conn; |
0896b752 | 1068 | |
b5c7a12d | 1069 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1070 | if (!conn) |
7b8631b5 | 1071 | return -EINVAL; |
0896b752 | 1072 | |
7b8631b5 MC |
1073 | if (transport->destroy_conn) |
1074 | transport->destroy_conn(conn); | |
7b8631b5 | 1075 | return 0; |
0896b752 AA |
1076 | } |
1077 | ||
fd7255f5 MC |
1078 | static int |
1079 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1080 | { | |
1081 | char *data = (char*)ev + sizeof(*ev); | |
1082 | struct iscsi_cls_conn *conn; | |
1083 | struct iscsi_cls_session *session; | |
a54a52ca | 1084 | int err = 0, value = 0; |
fd7255f5 MC |
1085 | |
1086 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1087 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1088 | if (!conn || !session) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | switch (ev->u.set_param.param) { | |
30a6c652 | 1092 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1093 | sscanf(data, "%d", &value); |
30a6c652 MC |
1094 | if (value != 0) |
1095 | session->recovery_tmo = value; | |
1096 | break; | |
fd7255f5 | 1097 | default: |
a54a52ca MC |
1098 | err = transport->set_param(conn, ev->u.set_param.param, |
1099 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1100 | } |
1101 | ||
1102 | return err; | |
1103 | } | |
1104 | ||
264faaaa OG |
1105 | static int |
1106 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1107 | struct iscsi_uevent *ev, int msg_type) | |
1108 | { | |
1109 | struct sockaddr *dst_addr; | |
1110 | int rc = 0; | |
1111 | ||
1112 | switch (msg_type) { | |
1113 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1114 | if (!transport->ep_connect) | |
1115 | return -EINVAL; | |
1116 | ||
1117 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1118 | rc = transport->ep_connect(dst_addr, | |
1119 | ev->u.ep_connect.non_blocking, | |
1120 | &ev->r.ep_connect_ret.handle); | |
1121 | break; | |
1122 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1123 | if (!transport->ep_poll) | |
1124 | return -EINVAL; | |
1125 | ||
1126 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1127 | ev->u.ep_poll.timeout_ms); | |
1128 | break; | |
1129 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1130 | if (!transport->ep_disconnect) | |
1131 | return -EINVAL; | |
1132 | ||
1133 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1134 | break; | |
1135 | } | |
1136 | return rc; | |
1137 | } | |
1138 | ||
01cb225d MC |
1139 | static int |
1140 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1141 | struct iscsi_uevent *ev) | |
1142 | { | |
2174a04e | 1143 | struct Scsi_Host *shost; |
01cb225d | 1144 | struct sockaddr *dst_addr; |
2174a04e | 1145 | int err; |
01cb225d MC |
1146 | |
1147 | if (!transport->tgt_dscvr) | |
1148 | return -EINVAL; | |
1149 | ||
2174a04e MC |
1150 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
1151 | if (IS_ERR(shost)) { | |
1152 | printk(KERN_ERR "target discovery could not find host no %u\n", | |
1153 | ev->u.tgt_dscvr.host_no); | |
1154 | return -ENODEV; | |
1155 | } | |
1156 | ||
1157 | ||
01cb225d | 1158 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
2174a04e MC |
1159 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1160 | ev->u.tgt_dscvr.enable, dst_addr); | |
1161 | scsi_host_put(shost); | |
1162 | return err; | |
01cb225d MC |
1163 | } |
1164 | ||
1d9bf13a MC |
1165 | static int |
1166 | iscsi_set_host_param(struct iscsi_transport *transport, | |
1167 | struct iscsi_uevent *ev) | |
1168 | { | |
1169 | char *data = (char*)ev + sizeof(*ev); | |
1170 | struct Scsi_Host *shost; | |
1171 | int err; | |
1172 | ||
1173 | if (!transport->set_host_param) | |
1174 | return -ENOSYS; | |
1175 | ||
1176 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); | |
1177 | if (IS_ERR(shost)) { | |
1178 | printk(KERN_ERR "set_host_param could not find host no %u\n", | |
1179 | ev->u.set_host_param.host_no); | |
1180 | return -ENODEV; | |
1181 | } | |
1182 | ||
1183 | err = transport->set_host_param(shost, ev->u.set_host_param.param, | |
1184 | data, ev->u.set_host_param.len); | |
1185 | scsi_host_put(shost); | |
1186 | return err; | |
1187 | } | |
1188 | ||
0896b752 AA |
1189 | static int |
1190 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1191 | { | |
1192 | int err = 0; | |
1193 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1194 | struct iscsi_transport *transport = NULL; | |
1195 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1196 | struct iscsi_cls_session *session; |
1197 | struct iscsi_cls_conn *conn; | |
0896b752 | 1198 | |
0896b752 AA |
1199 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1200 | if (!priv) | |
1201 | return -EINVAL; | |
1202 | transport = priv->iscsi_transport; | |
1203 | ||
7b7232f3 MC |
1204 | if (!try_module_get(transport->owner)) |
1205 | return -EINVAL; | |
1206 | ||
790f39a2 MC |
1207 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1208 | ||
0896b752 AA |
1209 | switch (nlh->nlmsg_type) { |
1210 | case ISCSI_UEVENT_CREATE_SESSION: | |
1211 | err = iscsi_if_create_session(priv, ev); | |
1212 | break; | |
1213 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1214 | session = iscsi_session_lookup(ev->u.d_session.sid); |
26974789 | 1215 | if (session) |
7b7232f3 | 1216 | transport->destroy_session(session); |
26974789 MC |
1217 | else |
1218 | err = -EINVAL; | |
1219 | break; | |
1220 | case ISCSI_UEVENT_UNBIND_SESSION: | |
1221 | session = iscsi_session_lookup(ev->u.d_session.sid); | |
1222 | if (session) | |
1223 | iscsi_unbind_session(session); | |
1224 | else | |
7b7232f3 | 1225 | err = -EINVAL; |
0896b752 AA |
1226 | break; |
1227 | case ISCSI_UEVENT_CREATE_CONN: | |
1228 | err = iscsi_if_create_conn(transport, ev); | |
1229 | break; | |
1230 | case ISCSI_UEVENT_DESTROY_CONN: | |
1231 | err = iscsi_if_destroy_conn(transport, ev); | |
1232 | break; | |
1233 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1234 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1235 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1236 | |
1237 | if (session && conn) | |
1238 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1239 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1240 | ev->u.b_conn.is_leading); |
1241 | else | |
1242 | err = -EINVAL; | |
0896b752 AA |
1243 | break; |
1244 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1245 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1246 | break; |
1247 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1248 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1249 | if (conn) |
1250 | ev->r.retcode = transport->start_conn(conn); | |
1251 | else | |
1252 | err = -EINVAL; | |
0896b752 AA |
1253 | break; |
1254 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1255 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1256 | if (conn) |
1257 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1258 | else | |
1259 | err = -EINVAL; | |
0896b752 AA |
1260 | break; |
1261 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1262 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1263 | if (conn) |
1264 | ev->r.retcode = transport->send_pdu(conn, | |
1265 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1266 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1267 | ev->u.send_pdu.data_size); | |
1268 | else | |
1269 | err = -EINVAL; | |
0896b752 AA |
1270 | break; |
1271 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1272 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1273 | break; |
264faaaa OG |
1274 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1275 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1276 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1277 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1278 | break; | |
01cb225d MC |
1279 | case ISCSI_UEVENT_TGT_DSCVR: |
1280 | err = iscsi_tgt_dscvr(transport, ev); | |
1281 | break; | |
1d9bf13a MC |
1282 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1283 | err = iscsi_set_host_param(transport, ev); | |
1284 | break; | |
0896b752 | 1285 | default: |
1d9bf13a | 1286 | err = -ENOSYS; |
0896b752 AA |
1287 | break; |
1288 | } | |
1289 | ||
7b7232f3 | 1290 | module_put(transport->owner); |
0896b752 AA |
1291 | return err; |
1292 | } | |
1293 | ||
b5c7a12d | 1294 | /* |
cd40b7d3 DL |
1295 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1296 | * Malformed skbs with wrong lengths or invalid creds are not processed. | |
b5c7a12d | 1297 | */ |
0896b752 | 1298 | static void |
cd40b7d3 | 1299 | iscsi_if_rx(struct sk_buff *skb) |
0896b752 | 1300 | { |
0b950672 | 1301 | mutex_lock(&rx_queue_mutex); |
cd40b7d3 DL |
1302 | while (skb->len >= NLMSG_SPACE(0)) { |
1303 | int err; | |
1304 | uint32_t rlen; | |
1305 | struct nlmsghdr *nlh; | |
1306 | struct iscsi_uevent *ev; | |
1307 | ||
1308 | nlh = nlmsg_hdr(skb); | |
1309 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1310 | skb->len < nlh->nlmsg_len) { | |
1311 | break; | |
ee7f8e40 | 1312 | } |
ee7f8e40 | 1313 | |
cd40b7d3 DL |
1314 | ev = NLMSG_DATA(nlh); |
1315 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1316 | if (rlen > skb->len) | |
1317 | rlen = skb->len; | |
0896b752 | 1318 | |
cd40b7d3 DL |
1319 | err = iscsi_if_recv_msg(skb, nlh); |
1320 | if (err) { | |
1321 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1322 | ev->iferror = err; | |
0896b752 | 1323 | } |
cd40b7d3 DL |
1324 | do { |
1325 | /* | |
1326 | * special case for GET_STATS: | |
1327 | * on success - sending reply and stats from | |
1328 | * inside of if_recv_msg(), | |
1329 | * on error - fall through. | |
1330 | */ | |
1331 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1332 | break; | |
1333 | err = iscsi_if_send_reply( | |
1334 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1335 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
1336 | } while (err < 0 && err != -ECONNREFUSED); | |
1337 | skb_pull(skb, rlen); | |
0896b752 | 1338 | } |
0b950672 | 1339 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1340 | } |
1da177e4 | 1341 | |
fd7255f5 | 1342 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
ee959b00 | 1343 | struct device_attribute dev_attr_##_prefix##_##_name = \ |
fd7255f5 MC |
1344 | __ATTR(_name,_mode,_show,_store) |
1345 | ||
1da177e4 | 1346 | /* |
0896b752 | 1347 | * iSCSI connection attrs |
1da177e4 | 1348 | */ |
a54a52ca | 1349 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1350 | static ssize_t \ |
ee959b00 TJ |
1351 | show_conn_param_##param(struct device *dev, \ |
1352 | struct device_attribute *attr, char *buf) \ | |
0896b752 | 1353 | { \ |
ee959b00 | 1354 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \ |
7b8631b5 | 1355 | struct iscsi_transport *t = conn->transport; \ |
a54a52ca | 1356 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1357 | } |
1358 | ||
a54a52ca MC |
1359 | #define iscsi_conn_attr(field, param) \ |
1360 | iscsi_conn_attr_show(param) \ | |
1361 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1362 | NULL); |
0896b752 | 1363 | |
a54a52ca MC |
1364 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1365 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1366 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1367 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1368 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1369 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1370 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1371 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1372 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1373 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1374 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
f6d5180c MC |
1375 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1376 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); | |
1da177e4 LT |
1377 | |
1378 | /* | |
0896b752 | 1379 | * iSCSI session attrs |
1da177e4 | 1380 | */ |
b2c64167 | 1381 | #define iscsi_session_attr_show(param, perm) \ |
fd7255f5 | 1382 | static ssize_t \ |
ee959b00 TJ |
1383 | show_session_param_##param(struct device *dev, \ |
1384 | struct device_attribute *attr, char *buf) \ | |
fd7255f5 | 1385 | { \ |
ee959b00 TJ |
1386 | struct iscsi_cls_session *session = \ |
1387 | iscsi_dev_to_session(dev->parent); \ | |
fd7255f5 | 1388 | struct iscsi_transport *t = session->transport; \ |
b2c64167 MC |
1389 | \ |
1390 | if (perm && !capable(CAP_SYS_ADMIN)) \ | |
1391 | return -EACCES; \ | |
a54a52ca | 1392 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1393 | } |
1394 | ||
b2c64167 MC |
1395 | #define iscsi_session_attr(field, param, perm) \ |
1396 | iscsi_session_attr_show(param, perm) \ | |
a54a52ca | 1397 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
fd7255f5 MC |
1398 | NULL); |
1399 | ||
b2c64167 MC |
1400 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1401 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); | |
1402 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); | |
1403 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); | |
1404 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); | |
1405 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); | |
1406 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); | |
1407 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); | |
1408 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); | |
1409 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); | |
1410 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); | |
1411 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); | |
1412 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); | |
1413 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); | |
4cd49ea1 MC |
1414 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1415 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); | |
1416 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); | |
1da177e4 | 1417 | |
6eabafbe | 1418 | static ssize_t |
ee959b00 TJ |
1419 | show_priv_session_state(struct device *dev, struct device_attribute *attr, |
1420 | char *buf) | |
6eabafbe | 1421 | { |
ee959b00 | 1422 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent); |
6eabafbe MC |
1423 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); |
1424 | } | |
1425 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, | |
1426 | NULL); | |
1427 | ||
fd7255f5 MC |
1428 | #define iscsi_priv_session_attr_show(field, format) \ |
1429 | static ssize_t \ | |
ee959b00 TJ |
1430 | show_priv_session_##field(struct device *dev, \ |
1431 | struct device_attribute *attr, char *buf) \ | |
fd7255f5 | 1432 | { \ |
ee959b00 TJ |
1433 | struct iscsi_cls_session *session = \ |
1434 | iscsi_dev_to_session(dev->parent); \ | |
fd7255f5 MC |
1435 | return sprintf(buf, format"\n", session->field); \ |
1436 | } | |
1437 | ||
1438 | #define iscsi_priv_session_attr(field, format) \ | |
1439 | iscsi_priv_session_attr_show(field, format) \ | |
1440 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1441 | NULL) | |
30a6c652 | 1442 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1443 | |
1819dc81 MC |
1444 | /* |
1445 | * iSCSI host attrs | |
1446 | */ | |
1447 | #define iscsi_host_attr_show(param) \ | |
1448 | static ssize_t \ | |
ee959b00 TJ |
1449 | show_host_param_##param(struct device *dev, \ |
1450 | struct device_attribute *attr, char *buf) \ | |
1819dc81 | 1451 | { \ |
ee959b00 | 1452 | struct Scsi_Host *shost = transport_class_to_shost(dev); \ |
1819dc81 MC |
1453 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ |
1454 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ | |
1455 | } | |
1456 | ||
1457 | #define iscsi_host_attr(field, param) \ | |
1458 | iscsi_host_attr_show(param) \ | |
1459 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ | |
1460 | NULL); | |
1461 | ||
d8196ed2 | 1462 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1819dc81 | 1463 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
d8196ed2 | 1464 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
8ad5781a | 1465 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1819dc81 | 1466 | |
fd7255f5 MC |
1467 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1468 | do { \ | |
ee959b00 | 1469 | priv->session_attrs[count] = &dev_attr_priv_sess_##field; \ |
fd7255f5 MC |
1470 | count++; \ |
1471 | } while (0) | |
1472 | ||
a54a52ca | 1473 | |
fd7255f5 MC |
1474 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1475 | do { \ | |
1476 | if (tt->param_mask & param_flag) { \ | |
ee959b00 | 1477 | priv->session_attrs[count] = &dev_attr_sess_##field; \ |
1da177e4 | 1478 | count++; \ |
fd7255f5 MC |
1479 | } \ |
1480 | } while (0) | |
1481 | ||
fd7255f5 MC |
1482 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1483 | do { \ | |
1484 | if (tt->param_mask & param_flag) { \ | |
ee959b00 | 1485 | priv->conn_attrs[count] = &dev_attr_conn_##field; \ |
fd7255f5 MC |
1486 | count++; \ |
1487 | } \ | |
1488 | } while (0) | |
1da177e4 | 1489 | |
1819dc81 MC |
1490 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1491 | do { \ | |
1492 | if (tt->host_param_mask & param_flag) { \ | |
ee959b00 | 1493 | priv->host_attrs[count] = &dev_attr_host_##field; \ |
1819dc81 MC |
1494 | count++; \ |
1495 | } \ | |
1496 | } while (0) | |
1497 | ||
0896b752 AA |
1498 | static int iscsi_session_match(struct attribute_container *cont, |
1499 | struct device *dev) | |
1da177e4 | 1500 | { |
7b8631b5 | 1501 | struct iscsi_cls_session *session; |
1da177e4 | 1502 | struct Scsi_Host *shost; |
0896b752 AA |
1503 | struct iscsi_internal *priv; |
1504 | ||
1505 | if (!iscsi_is_session_dev(dev)) | |
1506 | return 0; | |
1da177e4 | 1507 | |
7b8631b5 MC |
1508 | session = iscsi_dev_to_session(dev); |
1509 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1510 | if (!shost->transportt) |
1da177e4 LT |
1511 | return 0; |
1512 | ||
0896b752 AA |
1513 | priv = to_iscsi_internal(shost->transportt); |
1514 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1515 | return 0; |
1516 | ||
0896b752 | 1517 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1518 | } |
1519 | ||
0896b752 AA |
1520 | static int iscsi_conn_match(struct attribute_container *cont, |
1521 | struct device *dev) | |
1522 | { | |
7b8631b5 MC |
1523 | struct iscsi_cls_session *session; |
1524 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1525 | struct Scsi_Host *shost; |
0896b752 | 1526 | struct iscsi_internal *priv; |
1da177e4 | 1527 | |
0896b752 | 1528 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1529 | return 0; |
1530 | ||
7b8631b5 MC |
1531 | conn = iscsi_dev_to_conn(dev); |
1532 | session = iscsi_dev_to_session(conn->dev.parent); | |
1533 | shost = iscsi_session_to_shost(session); | |
1534 | ||
0896b752 | 1535 | if (!shost->transportt) |
1da177e4 LT |
1536 | return 0; |
1537 | ||
0896b752 AA |
1538 | priv = to_iscsi_internal(shost->transportt); |
1539 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1540 | return 0; | |
1da177e4 | 1541 | |
0896b752 AA |
1542 | return &priv->conn_cont.ac == cont; |
1543 | } | |
1544 | ||
30a6c652 MC |
1545 | static int iscsi_host_match(struct attribute_container *cont, |
1546 | struct device *dev) | |
1547 | { | |
1548 | struct Scsi_Host *shost; | |
1549 | struct iscsi_internal *priv; | |
1550 | ||
1551 | if (!scsi_is_host_device(dev)) | |
1552 | return 0; | |
1553 | ||
1554 | shost = dev_to_shost(dev); | |
1555 | if (!shost->transportt || | |
1556 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1557 | return 0; | |
1558 | ||
1559 | priv = to_iscsi_internal(shost->transportt); | |
1560 | return &priv->t.host_attrs.ac == cont; | |
1561 | } | |
1562 | ||
7b8631b5 MC |
1563 | struct scsi_transport_template * |
1564 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1565 | { |
1566 | struct iscsi_internal *priv; | |
1567 | unsigned long flags; | |
1568 | int count = 0, err; | |
1569 | ||
1570 | BUG_ON(!tt); | |
1571 | ||
1572 | priv = iscsi_if_transport_lookup(tt); | |
1573 | if (priv) | |
7b8631b5 | 1574 | return NULL; |
0896b752 | 1575 | |
24669f75 | 1576 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1577 | if (!priv) |
7b8631b5 | 1578 | return NULL; |
0896b752 | 1579 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1580 | priv->daemon_pid = -1; |
0896b752 | 1581 | priv->iscsi_transport = tt; |
30a6c652 | 1582 | priv->t.user_scan = iscsi_user_scan; |
0896b752 | 1583 | |
ee959b00 TJ |
1584 | priv->dev.class = &iscsi_transport_class; |
1585 | snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name); | |
1586 | err = device_register(&priv->dev); | |
0896b752 AA |
1587 | if (err) |
1588 | goto free_priv; | |
1589 | ||
ee959b00 | 1590 | err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group); |
0896b752 | 1591 | if (err) |
ee959b00 | 1592 | goto unregister_dev; |
0896b752 | 1593 | |
30a6c652 MC |
1594 | /* host parameters */ |
1595 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1596 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1597 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1598 | priv->t.host_size = sizeof(struct iscsi_host); | |
30a6c652 MC |
1599 | transport_container_register(&priv->t.host_attrs); |
1600 | ||
d8196ed2 | 1601 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
22236961 | 1602 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1819dc81 | 1603 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
8ad5781a | 1604 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1819dc81 MC |
1605 | BUG_ON(count > ISCSI_HOST_ATTRS); |
1606 | priv->host_attrs[count] = NULL; | |
1607 | count = 0; | |
1608 | ||
0896b752 AA |
1609 | /* connection parameters */ |
1610 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1611 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1612 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1613 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1614 | |
fd7255f5 MC |
1615 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1616 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1617 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1618 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1619 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1620 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1621 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1622 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1623 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1624 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1625 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
f6d5180c MC |
1626 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
1627 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); | |
0896b752 AA |
1628 | |
1629 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1630 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1631 | count = 0; |
1da177e4 | 1632 | |
0896b752 AA |
1633 | /* session parameters */ |
1634 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1635 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1636 | priv->session_cont.ac.match = iscsi_session_match; | |
1637 | transport_container_register(&priv->session_cont); | |
1638 | ||
fd7255f5 MC |
1639 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1640 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1641 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1642 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1643 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1644 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1645 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1646 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1647 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1648 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
b2c64167 MC |
1649 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
1650 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); | |
1651 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); | |
1652 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); | |
843c0a8a | 1653 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
4cd49ea1 MC |
1654 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
1655 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); | |
30a6c652 | 1656 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
6eabafbe | 1657 | SETUP_PRIV_SESSION_RD_ATTR(state); |
fd7255f5 | 1658 | |
0896b752 AA |
1659 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1660 | priv->session_attrs[count] = NULL; | |
1661 | ||
1662 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1663 | list_add(&priv->list, &iscsi_transports); | |
1664 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1665 | ||
1666 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1667 | return &priv->t; |
1da177e4 | 1668 | |
ee959b00 TJ |
1669 | unregister_dev: |
1670 | device_unregister(&priv->dev); | |
0896b752 AA |
1671 | free_priv: |
1672 | kfree(priv); | |
7b8631b5 | 1673 | return NULL; |
1da177e4 | 1674 | } |
0896b752 AA |
1675 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1676 | ||
1677 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1678 | { | |
1679 | struct iscsi_internal *priv; | |
1680 | unsigned long flags; | |
1681 | ||
1682 | BUG_ON(!tt); | |
1683 | ||
0b950672 | 1684 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1685 | |
1686 | priv = iscsi_if_transport_lookup(tt); | |
1687 | BUG_ON (!priv); | |
1688 | ||
0896b752 AA |
1689 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1690 | list_del(&priv->list); | |
1691 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1692 | ||
1693 | transport_container_unregister(&priv->conn_cont); | |
1694 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1695 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 | 1696 | |
ee959b00 TJ |
1697 | sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group); |
1698 | device_unregister(&priv->dev); | |
0b950672 | 1699 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1700 | |
0896b752 AA |
1701 | return 0; |
1702 | } | |
1703 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1704 | |
1da177e4 LT |
1705 | static __init int iscsi_transport_init(void) |
1706 | { | |
0896b752 | 1707 | int err; |
1da177e4 | 1708 | |
09492605 | 1709 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
f4246b33 MC |
1710 | ISCSI_TRANSPORT_VERSION); |
1711 | ||
41be1444 MC |
1712 | atomic_set(&iscsi_session_nr, 0); |
1713 | ||
0896b752 | 1714 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1715 | if (err) |
1716 | return err; | |
0896b752 | 1717 | |
30a6c652 | 1718 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1719 | if (err) |
1720 | goto unregister_transport_class; | |
1721 | ||
30a6c652 MC |
1722 | err = transport_class_register(&iscsi_connection_class); |
1723 | if (err) | |
1724 | goto unregister_host_class; | |
1725 | ||
0896b752 AA |
1726 | err = transport_class_register(&iscsi_session_class); |
1727 | if (err) | |
1728 | goto unregister_conn_class; | |
1729 | ||
b4b51029 | 1730 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, |
7b8631b5 | 1731 | THIS_MODULE); |
0896b752 AA |
1732 | if (!nls) { |
1733 | err = -ENOBUFS; | |
43a145a3 | 1734 | goto unregister_session_class; |
0896b752 AA |
1735 | } |
1736 | ||
d8bf541e MC |
1737 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
1738 | if (!iscsi_eh_timer_workq) | |
1739 | goto release_nls; | |
1740 | ||
43a145a3 | 1741 | return 0; |
0896b752 | 1742 | |
d8bf541e | 1743 | release_nls: |
b7c6ba6e | 1744 | netlink_kernel_release(nls); |
0896b752 AA |
1745 | unregister_session_class: |
1746 | transport_class_unregister(&iscsi_session_class); | |
1747 | unregister_conn_class: | |
1748 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1749 | unregister_host_class: |
1750 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1751 | unregister_transport_class: |
1752 | class_unregister(&iscsi_transport_class); | |
1753 | return err; | |
1da177e4 LT |
1754 | } |
1755 | ||
1756 | static void __exit iscsi_transport_exit(void) | |
1757 | { | |
d8bf541e | 1758 | destroy_workqueue(iscsi_eh_timer_workq); |
b7c6ba6e | 1759 | netlink_kernel_release(nls); |
0896b752 AA |
1760 | transport_class_unregister(&iscsi_connection_class); |
1761 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1762 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1763 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1764 | } |
1765 | ||
1766 | module_init(iscsi_transport_init); | |
1767 | module_exit(iscsi_transport_exit); | |
1768 | ||
0896b752 AA |
1769 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1770 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1771 | "Alex Aizman <itn780@yahoo.com>"); | |
1772 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1773 | MODULE_LICENSE("GPL"); |
f4246b33 | 1774 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |