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> | |
0896b752 | 24 | #include <linux/mempool.h> |
0b950672 | 25 | #include <linux/mutex.h> |
0896b752 | 26 | #include <net/tcp.h> |
1da177e4 LT |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_host.h> | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_transport.h> | |
31 | #include <scsi/scsi_transport_iscsi.h> | |
0896b752 | 32 | #include <scsi/iscsi_if.h> |
1da177e4 | 33 | |
0896b752 AA |
34 | #define ISCSI_SESSION_ATTRS 8 |
35 | #define ISCSI_CONN_ATTRS 6 | |
1da177e4 LT |
36 | |
37 | struct iscsi_internal { | |
38 | struct scsi_transport_template t; | |
0896b752 AA |
39 | struct iscsi_transport *iscsi_transport; |
40 | struct list_head list; | |
0896b752 AA |
41 | /* |
42 | * based on transport capabilities, at register time we set these | |
43 | * bits to tell the transport class it wants attributes displayed | |
44 | * in sysfs or that it can support different iSCSI Data-Path | |
45 | * capabilities | |
46 | */ | |
47 | uint32_t param_mask; | |
48 | ||
49 | struct class_device cdev; | |
1da177e4 LT |
50 | /* |
51 | * We do not have any private or other attrs. | |
52 | */ | |
0896b752 AA |
53 | struct transport_container conn_cont; |
54 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
55 | struct transport_container session_cont; | |
1da177e4 | 56 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
57 | }; |
58 | ||
b5c7a12d MC |
59 | static int iscsi_session_nr; /* sysfs session id for next new session */ |
60 | ||
0896b752 AA |
61 | /* |
62 | * list of registered transports and lock that must | |
63 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 64 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
65 | */ |
66 | static LIST_HEAD(iscsi_transports); | |
67 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
68 | ||
69 | #define to_iscsi_internal(tmpl) \ | |
70 | container_of(tmpl, struct iscsi_internal, t) | |
71 | ||
72 | #define cdev_to_iscsi_internal(_cdev) \ | |
73 | container_of(_cdev, struct iscsi_internal, cdev) | |
74 | ||
75 | static void iscsi_transport_release(struct class_device *cdev) | |
76 | { | |
77 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
78 | kfree(priv); | |
79 | } | |
1da177e4 | 80 | |
0896b752 AA |
81 | /* |
82 | * iscsi_transport_class represents the iscsi_transports that are | |
83 | * registered. | |
84 | */ | |
85 | static struct class iscsi_transport_class = { | |
86 | .name = "iscsi_transport", | |
87 | .release = iscsi_transport_release, | |
88 | }; | |
89 | ||
90 | static ssize_t | |
91 | show_transport_handle(struct class_device *cdev, char *buf) | |
92 | { | |
93 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 94 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
95 | } |
96 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
97 | ||
98 | #define show_transport_attr(name, format) \ | |
99 | static ssize_t \ | |
100 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
101 | { \ | |
102 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
103 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
104 | } \ | |
105 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
106 | ||
107 | show_transport_attr(caps, "0x%x"); | |
108 | show_transport_attr(max_lun, "%d"); | |
109 | show_transport_attr(max_conn, "%d"); | |
110 | show_transport_attr(max_cmd_len, "%d"); | |
111 | ||
112 | static struct attribute *iscsi_transport_attrs[] = { | |
113 | &class_device_attr_handle.attr, | |
114 | &class_device_attr_caps.attr, | |
115 | &class_device_attr_max_lun.attr, | |
116 | &class_device_attr_max_conn.attr, | |
117 | &class_device_attr_max_cmd_len.attr, | |
118 | NULL, | |
119 | }; | |
120 | ||
121 | static struct attribute_group iscsi_transport_group = { | |
122 | .attrs = iscsi_transport_attrs, | |
123 | }; | |
124 | ||
125 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, | |
126 | "iscsi_session", | |
1da177e4 LT |
127 | NULL, |
128 | NULL, | |
129 | NULL); | |
130 | ||
0896b752 AA |
131 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
132 | "iscsi_connection", | |
1da177e4 LT |
133 | NULL, |
134 | NULL, | |
135 | NULL); | |
0896b752 AA |
136 | |
137 | static struct sock *nls; | |
138 | static int daemon_pid; | |
0b950672 | 139 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
140 | |
141 | struct mempool_zone { | |
142 | mempool_t *pool; | |
143 | atomic_t allocated; | |
144 | int size; | |
145 | int hiwat; | |
146 | struct list_head freequeue; | |
147 | spinlock_t freelock; | |
148 | }; | |
149 | ||
7b8631b5 | 150 | static struct mempool_zone *z_reply; |
0896b752 | 151 | |
1da177e4 | 152 | /* |
0896b752 AA |
153 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
154 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
155 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
156 | * be able to predict or change operational behavior | |
1da177e4 | 157 | */ |
0896b752 AA |
158 | #define Z_MAX_REPLY 8 |
159 | #define Z_HIWAT_REPLY 6 | |
160 | #define Z_MAX_PDU 8 | |
161 | #define Z_HIWAT_PDU 6 | |
162 | #define Z_MAX_ERROR 16 | |
163 | #define Z_HIWAT_ERROR 12 | |
164 | ||
7b7232f3 MC |
165 | static LIST_HEAD(sesslist); |
166 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
167 | static LIST_HEAD(connlist); |
168 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 169 | |
b5c7a12d MC |
170 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
171 | { | |
172 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
173 | return sess->sid; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Returns the matching session to a given sid | |
178 | */ | |
179 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
180 | { |
181 | unsigned long flags; | |
182 | struct iscsi_cls_session *sess; | |
183 | ||
184 | spin_lock_irqsave(&sesslock, flags); | |
185 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 186 | if (sess->sid == sid) { |
7b7232f3 MC |
187 | spin_unlock_irqrestore(&sesslock, flags); |
188 | return sess; | |
189 | } | |
190 | } | |
191 | spin_unlock_irqrestore(&sesslock, flags); | |
192 | return NULL; | |
193 | } | |
194 | ||
b5c7a12d MC |
195 | /* |
196 | * Returns the matching connection to a given sid / cid tuple | |
197 | */ | |
198 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
199 | { |
200 | unsigned long flags; | |
201 | struct iscsi_cls_conn *conn; | |
202 | ||
203 | spin_lock_irqsave(&connlock, flags); | |
204 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 205 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
206 | spin_unlock_irqrestore(&connlock, flags); |
207 | return conn; | |
208 | } | |
209 | } | |
210 | spin_unlock_irqrestore(&connlock, flags); | |
211 | return NULL; | |
212 | } | |
213 | ||
7b8631b5 MC |
214 | /* |
215 | * The following functions can be used by LLDs that allocate | |
216 | * their own scsi_hosts or by software iscsi LLDs | |
217 | */ | |
218 | static void iscsi_session_release(struct device *dev) | |
219 | { | |
220 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
221 | struct iscsi_transport *transport = session->transport; | |
222 | struct Scsi_Host *shost; | |
0896b752 | 223 | |
7b8631b5 MC |
224 | shost = iscsi_session_to_shost(session); |
225 | scsi_host_put(shost); | |
226 | kfree(session); | |
227 | module_put(transport->owner); | |
228 | } | |
0896b752 | 229 | |
7b8631b5 MC |
230 | static int iscsi_is_session_dev(const struct device *dev) |
231 | { | |
232 | return dev->release == iscsi_session_release; | |
233 | } | |
0896b752 | 234 | |
7b8631b5 MC |
235 | /** |
236 | * iscsi_create_session - create iscsi class session | |
237 | * @shost: scsi host | |
238 | * @transport: iscsi transport | |
239 | * | |
b5c7a12d | 240 | * This can be called from a LLD or iscsi_transport. |
7b8631b5 MC |
241 | **/ |
242 | struct iscsi_cls_session * | |
243 | iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) | |
244 | { | |
245 | struct iscsi_cls_session *session; | |
246 | int err; | |
247 | ||
248 | if (!try_module_get(transport->owner)) | |
249 | return NULL; | |
250 | ||
b5c7a12d MC |
251 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
252 | GFP_KERNEL); | |
7b8631b5 MC |
253 | if (!session) |
254 | goto module_put; | |
255 | session->transport = transport; | |
256 | ||
b5c7a12d MC |
257 | if (transport->sessiondata_size) |
258 | session->dd_data = &session[1]; | |
259 | ||
7b8631b5 MC |
260 | /* this is released in the dev's release function */ |
261 | scsi_host_get(shost); | |
b5c7a12d MC |
262 | session->sid = iscsi_session_nr++; |
263 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", | |
264 | session->sid); | |
7b8631b5 MC |
265 | session->dev.parent = &shost->shost_gendev; |
266 | session->dev.release = iscsi_session_release; | |
267 | err = device_register(&session->dev); | |
268 | if (err) { | |
269 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
270 | "register session's dev\n"); | |
271 | goto free_session; | |
272 | } | |
273 | transport_register_device(&session->dev); | |
274 | ||
275 | return session; | |
276 | ||
277 | free_session: | |
278 | kfree(session); | |
279 | module_put: | |
280 | module_put(transport->owner); | |
281 | return NULL; | |
282 | } | |
283 | ||
284 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
285 | ||
286 | /** | |
287 | * iscsi_destroy_session - destroy iscsi session | |
288 | * @session: iscsi_session | |
289 | * | |
290 | * Can be called by a LLD or iscsi_transport. There must not be | |
291 | * any running connections. | |
292 | **/ | |
293 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
294 | { | |
295 | transport_unregister_device(&session->dev); | |
296 | device_unregister(&session->dev); | |
297 | return 0; | |
298 | } | |
299 | ||
300 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
301 | ||
302 | static void iscsi_conn_release(struct device *dev) | |
303 | { | |
304 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
305 | struct device *parent = conn->dev.parent; | |
306 | ||
307 | kfree(conn); | |
308 | put_device(parent); | |
309 | } | |
310 | ||
311 | static int iscsi_is_conn_dev(const struct device *dev) | |
312 | { | |
313 | return dev->release == iscsi_conn_release; | |
314 | } | |
315 | ||
316 | /** | |
317 | * iscsi_create_conn - create iscsi class connection | |
318 | * @session: iscsi cls session | |
319 | * @cid: connection id | |
320 | * | |
321 | * This can be called from a LLD or iscsi_transport. The connection | |
322 | * is child of the session so cid must be unique for all connections | |
323 | * on the session. | |
b5c7a12d MC |
324 | * |
325 | * Since we do not support MCS, cid will normally be zero. In some cases | |
326 | * for software iscsi we could be trying to preallocate a connection struct | |
327 | * in which case there could be two connection structs and cid would be | |
328 | * non-zero. | |
7b8631b5 MC |
329 | **/ |
330 | struct iscsi_cls_conn * | |
331 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
332 | { | |
333 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 MC |
334 | struct iscsi_cls_conn *conn; |
335 | int err; | |
336 | ||
337 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
338 | if (!conn) | |
339 | return NULL; | |
340 | ||
341 | if (transport->conndata_size) | |
342 | conn->dd_data = &conn[1]; | |
343 | ||
344 | INIT_LIST_HEAD(&conn->conn_list); | |
345 | conn->transport = transport; | |
b5c7a12d | 346 | conn->cid = cid; |
7b8631b5 MC |
347 | |
348 | /* this is released in the dev's release function */ | |
349 | if (!get_device(&session->dev)) | |
350 | goto free_conn; | |
b5c7a12d | 351 | |
7b8631b5 | 352 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 353 | session->sid, cid); |
7b8631b5 MC |
354 | conn->dev.parent = &session->dev; |
355 | conn->dev.release = iscsi_conn_release; | |
356 | err = device_register(&conn->dev); | |
357 | if (err) { | |
358 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
359 | "connection's dev\n"); | |
360 | goto release_parent_ref; | |
361 | } | |
362 | transport_register_device(&conn->dev); | |
363 | return conn; | |
364 | ||
365 | release_parent_ref: | |
366 | put_device(&session->dev); | |
367 | free_conn: | |
368 | kfree(conn); | |
369 | return NULL; | |
370 | } | |
371 | ||
372 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
373 | ||
374 | /** | |
375 | * iscsi_destroy_conn - destroy iscsi class connection | |
376 | * @session: iscsi cls session | |
377 | * | |
378 | * This can be called from a LLD or iscsi_transport. | |
379 | **/ | |
380 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
381 | { | |
382 | transport_unregister_device(&conn->dev); | |
383 | device_unregister(&conn->dev); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
388 | ||
389 | /* | |
390 | * These functions are used only by software iscsi_transports | |
391 | * which do not allocate and more their scsi_hosts since this | |
392 | * is initiated from userspace. | |
393 | */ | |
394 | ||
395 | /* | |
396 | * iSCSI Session's hostdata organization: | |
397 | * | |
398 | * *------------------* <== hostdata_session(host->hostdata) | |
399 | * | ptr to class sess| | |
400 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
401 | * | transport's data | | |
402 | * *------------------* | |
403 | */ | |
404 | ||
405 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
406 | _t->hostdata_size % sizeof(unsigned long)) | |
407 | ||
408 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
409 | ||
410 | /** | |
411 | * iscsi_transport_create_session - create iscsi cls session and host | |
412 | * scsit: scsi transport template | |
413 | * transport: iscsi transport template | |
414 | * | |
415 | * This can be used by software iscsi_transports that allocate | |
416 | * a session per scsi host. | |
417 | **/ | |
418 | struct Scsi_Host * | |
419 | iscsi_transport_create_session(struct scsi_transport_template *scsit, | |
420 | struct iscsi_transport *transport) | |
421 | { | |
422 | struct iscsi_cls_session *session; | |
423 | struct Scsi_Host *shost; | |
7b7232f3 | 424 | unsigned long flags; |
7b8631b5 MC |
425 | |
426 | shost = scsi_host_alloc(transport->host_template, | |
427 | hostdata_privsize(transport)); | |
428 | if (!shost) { | |
429 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
430 | "session\n"); | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | shost->max_id = 1; | |
435 | shost->max_channel = 0; | |
436 | shost->max_lun = transport->max_lun; | |
437 | shost->max_cmd_len = transport->max_cmd_len; | |
438 | shost->transportt = scsit; | |
55e3299d | 439 | shost->transportt->create_work_queue = 1; |
7b8631b5 MC |
440 | |
441 | if (scsi_add_host(shost, NULL)) | |
442 | goto free_host; | |
443 | ||
444 | session = iscsi_create_session(shost, transport); | |
445 | if (!session) | |
446 | goto remove_host; | |
0896b752 | 447 | |
7b8631b5 | 448 | *(unsigned long*)shost->hostdata = (unsigned long)session; |
7b7232f3 MC |
449 | spin_lock_irqsave(&sesslock, flags); |
450 | list_add(&session->sess_list, &sesslist); | |
451 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
452 | return shost; |
453 | ||
454 | remove_host: | |
455 | scsi_remove_host(shost); | |
456 | free_host: | |
457 | scsi_host_put(shost); | |
458 | return NULL; | |
459 | } | |
0896b752 | 460 | |
7b8631b5 | 461 | EXPORT_SYMBOL_GPL(iscsi_transport_create_session); |
0896b752 | 462 | |
7b8631b5 MC |
463 | /** |
464 | * iscsi_transport_destroy_session - destroy session and scsi host | |
465 | * shost: scsi host | |
466 | * | |
467 | * This can be used by software iscsi_transports that allocate | |
468 | * a session per scsi host. | |
469 | **/ | |
470 | int iscsi_transport_destroy_session(struct Scsi_Host *shost) | |
471 | { | |
472 | struct iscsi_cls_session *session; | |
7b7232f3 | 473 | unsigned long flags; |
0896b752 | 474 | |
7b8631b5 MC |
475 | scsi_remove_host(shost); |
476 | session = hostdata_session(shost->hostdata); | |
7b7232f3 MC |
477 | spin_lock_irqsave(&sesslock, flags); |
478 | list_del(&session->sess_list); | |
479 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
480 | iscsi_destroy_session(session); |
481 | /* ref from host alloc */ | |
482 | scsi_host_put(shost); | |
483 | return 0; | |
484 | } | |
485 | ||
486 | EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session); | |
487 | ||
488 | /* | |
489 | * iscsi interface functions | |
490 | */ | |
0896b752 AA |
491 | static struct iscsi_internal * |
492 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
493 | { | |
494 | struct iscsi_internal *priv; | |
495 | unsigned long flags; | |
496 | ||
497 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
498 | list_for_each_entry(priv, &iscsi_transports, list) { | |
499 | if (tt == priv->iscsi_transport) { | |
500 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
501 | return priv; | |
502 | } | |
503 | } | |
504 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
505 | return NULL; | |
506 | } | |
1da177e4 | 507 | |
0896b752 AA |
508 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
509 | { | |
510 | return (struct list_head *)&skb->cb; | |
511 | } | |
1da177e4 | 512 | |
0896b752 | 513 | static void* |
28e5554d | 514 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) |
0896b752 AA |
515 | { |
516 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 517 | |
0896b752 | 518 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
519 | } |
520 | ||
0896b752 AA |
521 | static void |
522 | mempool_zone_free_skb(void *element, void *pool_data) | |
523 | { | |
524 | kfree_skb(element); | |
525 | } | |
1da177e4 | 526 | |
0896b752 AA |
527 | static void |
528 | mempool_zone_complete(struct mempool_zone *zone) | |
529 | { | |
530 | unsigned long flags; | |
531 | struct list_head *lh, *n; | |
1da177e4 | 532 | |
0896b752 AA |
533 | spin_lock_irqsave(&zone->freelock, flags); |
534 | list_for_each_safe(lh, n, &zone->freequeue) { | |
535 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
536 | offsetof(struct sk_buff, cb)); | |
537 | if (!skb_shared(skb)) { | |
538 | list_del(skb_to_lh(skb)); | |
539 | mempool_free(skb, zone->pool); | |
540 | atomic_dec(&zone->allocated); | |
541 | } | |
542 | } | |
543 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
544 | } |
545 | ||
7b8631b5 MC |
546 | static struct mempool_zone * |
547 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 548 | { |
7b8631b5 MC |
549 | struct mempool_zone *zp; |
550 | ||
551 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
552 | if (!zp) | |
553 | return NULL; | |
554 | ||
142e301f MC |
555 | zp->size = size; |
556 | zp->hiwat = hiwat; | |
557 | INIT_LIST_HEAD(&zp->freequeue); | |
558 | spin_lock_init(&zp->freelock); | |
559 | atomic_set(&zp->allocated, 0); | |
560 | ||
0896b752 AA |
561 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
562 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
563 | if (!zp->pool) { |
564 | kfree(zp); | |
565 | return NULL; | |
566 | } | |
1da177e4 | 567 | |
7b8631b5 | 568 | return zp; |
0896b752 AA |
569 | } |
570 | ||
7b8631b5 MC |
571 | static void mempool_zone_destroy(struct mempool_zone *zp) |
572 | { | |
573 | mempool_destroy(zp->pool); | |
574 | kfree(zp); | |
575 | } | |
0896b752 AA |
576 | |
577 | static struct sk_buff* | |
578 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 579 | { |
0896b752 AA |
580 | struct sk_buff *skb; |
581 | ||
582 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
583 | if (skb) | |
584 | atomic_inc(&zone->allocated); | |
585 | return skb; | |
586 | } | |
1da177e4 | 587 | |
0896b752 AA |
588 | static int |
589 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
590 | { | |
591 | unsigned long flags; | |
592 | int rc; | |
1da177e4 | 593 | |
0896b752 AA |
594 | skb_get(skb); |
595 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
596 | if (rc < 0) { | |
597 | mempool_free(skb, zone->pool); | |
598 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
599 | return rc; | |
600 | } | |
601 | ||
602 | spin_lock_irqsave(&zone->freelock, flags); | |
603 | list_add(skb_to_lh(skb), &zone->freequeue); | |
604 | spin_unlock_irqrestore(&zone->freelock, flags); | |
605 | ||
606 | return 0; | |
1da177e4 | 607 | } |
1da177e4 | 608 | |
7b7232f3 | 609 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 610 | char *data, uint32_t data_size) |
1da177e4 | 611 | { |
0896b752 AA |
612 | struct nlmsghdr *nlh; |
613 | struct sk_buff *skb; | |
614 | struct iscsi_uevent *ev; | |
0896b752 AA |
615 | char *pdu; |
616 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
617 | data_size); | |
618 | ||
7b8631b5 | 619 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 620 | |
7b8631b5 | 621 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 622 | if (!skb) { |
7b7232f3 | 623 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
624 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
625 | "control PDU: OOM\n"); | |
0896b752 AA |
626 | return -ENOMEM; |
627 | } | |
1da177e4 | 628 | |
0896b752 AA |
629 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
630 | ev = NLMSG_DATA(nlh); | |
631 | memset(ev, 0, sizeof(*ev)); | |
632 | ev->transport_handle = iscsi_handle(conn->transport); | |
633 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 634 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 635 | ev->iferror = -ENOMEM; |
b5c7a12d MC |
636 | ev->r.recv_req.cid = conn->cid; |
637 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
638 | pdu = (char*)ev + sizeof(*ev); |
639 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
640 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 641 | |
7b8631b5 | 642 | return iscsi_unicast_skb(conn->z_pdu, skb); |
1da177e4 | 643 | } |
0896b752 | 644 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 645 | |
7b7232f3 | 646 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 647 | { |
0896b752 AA |
648 | struct nlmsghdr *nlh; |
649 | struct sk_buff *skb; | |
650 | struct iscsi_uevent *ev; | |
0896b752 AA |
651 | int len = NLMSG_SPACE(sizeof(*ev)); |
652 | ||
7b8631b5 | 653 | mempool_zone_complete(conn->z_error); |
0896b752 | 654 | |
7b8631b5 | 655 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 656 | if (!skb) { |
7b8631b5 MC |
657 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
658 | "conn error (%d)\n", error); | |
0896b752 AA |
659 | return; |
660 | } | |
661 | ||
662 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
663 | ev = NLMSG_DATA(nlh); | |
664 | ev->transport_handle = iscsi_handle(conn->transport); | |
665 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 666 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
667 | ev->iferror = -ENOMEM; |
668 | ev->r.connerror.error = error; | |
b5c7a12d MC |
669 | ev->r.connerror.cid = conn->cid; |
670 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 671 | |
7b8631b5 | 672 | iscsi_unicast_skb(conn->z_error, skb); |
1da177e4 | 673 | |
7b8631b5 MC |
674 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
675 | error); | |
0896b752 AA |
676 | } |
677 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
678 | ||
679 | static int | |
680 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
681 | void *payload, int size) | |
682 | { | |
683 | struct sk_buff *skb; | |
684 | struct nlmsghdr *nlh; | |
685 | int len = NLMSG_SPACE(size); | |
686 | int flags = multi ? NLM_F_MULTI : 0; | |
687 | int t = done ? NLMSG_DONE : type; | |
688 | ||
7b8631b5 | 689 | mempool_zone_complete(z_reply); |
0896b752 | 690 | |
7b8631b5 | 691 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
692 | /* |
693 | * FIXME: | |
694 | * user is supposed to react on iferror == -ENOMEM; | |
695 | * see iscsi_if_rx(). | |
696 | */ | |
697 | BUG_ON(!skb); | |
698 | ||
699 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
700 | nlh->nlmsg_flags = flags; | |
701 | memcpy(NLMSG_DATA(nlh), payload, size); | |
7b8631b5 | 702 | return iscsi_unicast_skb(z_reply, skb); |
1da177e4 | 703 | } |
1da177e4 | 704 | |
7b8631b5 | 705 | static int |
5b940adf | 706 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
707 | { |
708 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
709 | struct iscsi_stats *stats; | |
710 | struct sk_buff *skbstat; | |
711 | struct iscsi_cls_conn *conn; | |
712 | struct nlmsghdr *nlhstat; | |
713 | struct iscsi_uevent *evstat; | |
714 | int len = NLMSG_SPACE(sizeof(*ev) + | |
715 | sizeof(struct iscsi_stats) + | |
716 | sizeof(struct iscsi_stats_custom) * | |
717 | ISCSI_STATS_CUSTOM_MAX); | |
718 | int err = 0; | |
0896b752 | 719 | |
b5c7a12d | 720 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
721 | if (!conn) |
722 | return -EEXIST; | |
0896b752 | 723 | |
7b8631b5 MC |
724 | do { |
725 | int actual_size; | |
0896b752 | 726 | |
7b8631b5 | 727 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 728 | |
7b8631b5 MC |
729 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
730 | if (!skbstat) { | |
731 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
732 | "deliver stats: OOM\n"); | |
733 | return -ENOMEM; | |
734 | } | |
735 | ||
736 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
737 | (len - sizeof(*nlhstat)), 0); | |
738 | evstat = NLMSG_DATA(nlhstat); | |
739 | memset(evstat, 0, sizeof(*evstat)); | |
740 | evstat->transport_handle = iscsi_handle(conn->transport); | |
741 | evstat->type = nlh->nlmsg_type; | |
742 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
743 | evstat->iferror = -ENOMEM; | |
b5c7a12d MC |
744 | evstat->u.get_stats.cid = |
745 | ev->u.get_stats.cid; | |
746 | evstat->u.get_stats.sid = | |
747 | ev->u.get_stats.sid; | |
7b8631b5 MC |
748 | stats = (struct iscsi_stats *) |
749 | ((char*)evstat + sizeof(*evstat)); | |
750 | memset(stats, 0, sizeof(*stats)); | |
751 | ||
7b7232f3 | 752 | transport->get_stats(conn, stats); |
7b8631b5 MC |
753 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
754 | sizeof(struct iscsi_stats) + | |
755 | sizeof(struct iscsi_stats_custom) * | |
756 | stats->custom_length); | |
757 | actual_size -= sizeof(*nlhstat); | |
758 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 759 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
760 | nlhstat->nlmsg_len = actual_size; |
761 | ||
762 | err = iscsi_unicast_skb(conn->z_pdu, skbstat); | |
763 | } while (err < 0 && err != -ECONNREFUSED); | |
764 | ||
765 | return err; | |
0896b752 AA |
766 | } |
767 | ||
768 | static int | |
769 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
770 | { | |
771 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 772 | struct iscsi_cls_session *session; |
b5c7a12d | 773 | uint32_t hostno; |
0896b752 | 774 | |
7b7232f3 MC |
775 | session = transport->create_session(&priv->t, |
776 | ev->u.c_session.initial_cmdsn, | |
b5c7a12d | 777 | &hostno); |
7b7232f3 | 778 | if (!session) |
7b8631b5 | 779 | return -ENOMEM; |
0896b752 | 780 | |
b5c7a12d MC |
781 | ev->r.c_session_ret.host_no = hostno; |
782 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 783 | return 0; |
0896b752 AA |
784 | } |
785 | ||
786 | static int | |
7b7232f3 | 787 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 788 | { |
7b8631b5 | 789 | struct iscsi_cls_conn *conn; |
7b7232f3 | 790 | struct iscsi_cls_session *session; |
0896b752 | 791 | unsigned long flags; |
7b8631b5 | 792 | |
b5c7a12d MC |
793 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
794 | if (!session) { | |
795 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
796 | ev->u.c_conn.sid); | |
7b8631b5 | 797 | return -EINVAL; |
b5c7a12d | 798 | } |
0896b752 | 799 | |
7b7232f3 | 800 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
801 | if (!conn) { |
802 | printk(KERN_ERR "iscsi: couldn't create a new " | |
803 | "connection for session %d\n", | |
804 | session->sid); | |
7b7232f3 | 805 | return -ENOMEM; |
b5c7a12d | 806 | } |
0896b752 | 807 | |
7b8631b5 | 808 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
809 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
810 | sizeof(struct iscsi_hdr) + | |
811 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
812 | Z_HIWAT_PDU); | |
7b8631b5 MC |
813 | if (!conn->z_pdu) { |
814 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
815 | "pdu zone for new conn\n"); | |
816 | goto destroy_conn; | |
0896b752 | 817 | } |
7b8631b5 MC |
818 | |
819 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
820 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
821 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
822 | if (!conn->z_error) { |
823 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
824 | "error zone for new conn\n"); | |
825 | goto free_pdu_pool; | |
0896b752 AA |
826 | } |
827 | ||
b5c7a12d MC |
828 | ev->r.c_conn_ret.sid = session->sid; |
829 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 AA |
830 | |
831 | spin_lock_irqsave(&connlock, flags); | |
832 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
833 | conn->active = 1; |
834 | spin_unlock_irqrestore(&connlock, flags); | |
835 | ||
0896b752 AA |
836 | return 0; |
837 | ||
7b8631b5 MC |
838 | free_pdu_pool: |
839 | mempool_zone_destroy(conn->z_pdu); | |
840 | destroy_conn: | |
841 | if (transport->destroy_conn) | |
842 | transport->destroy_conn(conn->dd_data); | |
7b8631b5 | 843 | return -ENOMEM; |
1da177e4 LT |
844 | } |
845 | ||
0896b752 AA |
846 | static int |
847 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
848 | { | |
849 | unsigned long flags; | |
7b8631b5 MC |
850 | struct iscsi_cls_conn *conn; |
851 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 | 852 | |
b5c7a12d | 853 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 854 | if (!conn) |
7b8631b5 | 855 | return -EINVAL; |
0896b752 AA |
856 | spin_lock_irqsave(&connlock, flags); |
857 | conn->active = 0; | |
858 | list_del(&conn->conn_list); | |
859 | spin_unlock_irqrestore(&connlock, flags); | |
860 | ||
7b8631b5 MC |
861 | z_pdu = conn->z_pdu; |
862 | z_error = conn->z_error; | |
0896b752 | 863 | |
7b8631b5 MC |
864 | if (transport->destroy_conn) |
865 | transport->destroy_conn(conn); | |
0896b752 | 866 | |
7b8631b5 MC |
867 | mempool_zone_destroy(z_pdu); |
868 | mempool_zone_destroy(z_error); | |
0896b752 | 869 | |
7b8631b5 | 870 | return 0; |
0896b752 AA |
871 | } |
872 | ||
873 | static int | |
874 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
875 | { | |
876 | int err = 0; | |
877 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
878 | struct iscsi_transport *transport = NULL; | |
879 | struct iscsi_internal *priv; | |
7b7232f3 MC |
880 | struct iscsi_cls_session *session; |
881 | struct iscsi_cls_conn *conn; | |
0896b752 | 882 | |
0896b752 AA |
883 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
884 | if (!priv) | |
885 | return -EINVAL; | |
886 | transport = priv->iscsi_transport; | |
887 | ||
7b7232f3 MC |
888 | if (!try_module_get(transport->owner)) |
889 | return -EINVAL; | |
890 | ||
0896b752 AA |
891 | switch (nlh->nlmsg_type) { |
892 | case ISCSI_UEVENT_CREATE_SESSION: | |
893 | err = iscsi_if_create_session(priv, ev); | |
894 | break; | |
895 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 896 | session = iscsi_session_lookup(ev->u.d_session.sid); |
7b7232f3 MC |
897 | if (session) |
898 | transport->destroy_session(session); | |
899 | else | |
900 | err = -EINVAL; | |
0896b752 AA |
901 | break; |
902 | case ISCSI_UEVENT_CREATE_CONN: | |
903 | err = iscsi_if_create_conn(transport, ev); | |
904 | break; | |
905 | case ISCSI_UEVENT_DESTROY_CONN: | |
906 | err = iscsi_if_destroy_conn(transport, ev); | |
907 | break; | |
908 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
909 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
910 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
911 | |
912 | if (session && conn) | |
913 | ev->r.retcode = transport->bind_conn(session, conn, | |
914 | ev->u.b_conn.transport_fd, | |
915 | ev->u.b_conn.is_leading); | |
916 | else | |
917 | err = -EINVAL; | |
0896b752 AA |
918 | break; |
919 | case ISCSI_UEVENT_SET_PARAM: | |
b5c7a12d | 920 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); |
7b7232f3 MC |
921 | if (conn) |
922 | ev->r.retcode = transport->set_param(conn, | |
923 | ev->u.set_param.param, ev->u.set_param.value); | |
924 | else | |
925 | err = -EINVAL; | |
0896b752 AA |
926 | break; |
927 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 928 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
929 | if (conn) |
930 | ev->r.retcode = transport->start_conn(conn); | |
931 | else | |
932 | err = -EINVAL; | |
933 | ||
0896b752 AA |
934 | break; |
935 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 936 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
937 | if (conn) |
938 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
939 | else | |
940 | err = -EINVAL; | |
0896b752 AA |
941 | break; |
942 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 943 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
944 | if (conn) |
945 | ev->r.retcode = transport->send_pdu(conn, | |
946 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
947 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
948 | ev->u.send_pdu.data_size); | |
949 | else | |
950 | err = -EINVAL; | |
0896b752 AA |
951 | break; |
952 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 953 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 AA |
954 | break; |
955 | default: | |
956 | err = -EINVAL; | |
957 | break; | |
958 | } | |
959 | ||
7b7232f3 | 960 | module_put(transport->owner); |
0896b752 AA |
961 | return err; |
962 | } | |
963 | ||
b5c7a12d MC |
964 | /* |
965 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
966 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or | |
967 | * invalid creds are discarded silently. | |
968 | */ | |
0896b752 AA |
969 | static void |
970 | iscsi_if_rx(struct sock *sk, int len) | |
971 | { | |
972 | struct sk_buff *skb; | |
1da177e4 | 973 | |
0b950672 | 974 | mutex_lock(&rx_queue_mutex); |
0896b752 | 975 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
976 | if (NETLINK_CREDS(skb)->uid) { |
977 | skb_pull(skb, skb->len); | |
978 | goto free_skb; | |
979 | } | |
980 | daemon_pid = NETLINK_CREDS(skb)->pid; | |
981 | ||
0896b752 AA |
982 | while (skb->len >= NLMSG_SPACE(0)) { |
983 | int err; | |
984 | uint32_t rlen; | |
985 | struct nlmsghdr *nlh; | |
986 | struct iscsi_uevent *ev; | |
987 | ||
988 | nlh = (struct nlmsghdr *)skb->data; | |
989 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
990 | skb->len < nlh->nlmsg_len) { | |
991 | break; | |
992 | } | |
ee7f8e40 | 993 | |
0896b752 AA |
994 | ev = NLMSG_DATA(nlh); |
995 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
996 | if (rlen > skb->len) | |
997 | rlen = skb->len; | |
ee7f8e40 | 998 | |
0896b752 AA |
999 | err = iscsi_if_recv_msg(skb, nlh); |
1000 | if (err) { | |
1001 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1002 | ev->iferror = err; | |
1003 | } | |
1004 | do { | |
1005 | /* | |
1006 | * special case for GET_STATS: | |
1007 | * on success - sending reply and stats from | |
1008 | * inside of if_recv_msg(), | |
1009 | * on error - fall through. | |
1010 | */ | |
1011 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1012 | break; | |
1013 | err = iscsi_if_send_reply( | |
1014 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1015 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
1016 | if (atomic_read(&z_reply->allocated) >= |
1017 | z_reply->hiwat) | |
0896b752 AA |
1018 | ev->iferror = -ENOMEM; |
1019 | } while (err < 0 && err != -ECONNREFUSED); | |
1020 | skb_pull(skb, rlen); | |
1021 | } | |
ee7f8e40 | 1022 | free_skb: |
0896b752 AA |
1023 | kfree_skb(skb); |
1024 | } | |
0b950672 | 1025 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1026 | } |
1da177e4 | 1027 | |
7b8631b5 MC |
1028 | #define iscsi_cdev_to_conn(_cdev) \ |
1029 | iscsi_dev_to_conn(_cdev->dev) | |
1030 | ||
1da177e4 | 1031 | /* |
0896b752 | 1032 | * iSCSI connection attrs |
1da177e4 | 1033 | */ |
0896b752 AA |
1034 | #define iscsi_conn_int_attr_show(param, format) \ |
1035 | static ssize_t \ | |
1036 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
1037 | { \ | |
1038 | uint32_t value = 0; \ | |
7b8631b5 MC |
1039 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1040 | struct iscsi_transport *t = conn->transport; \ | |
0896b752 | 1041 | \ |
7b7232f3 | 1042 | t->get_conn_param(conn, param, &value); \ |
0896b752 AA |
1043 | return snprintf(buf, 20, format"\n", value); \ |
1044 | } | |
1045 | ||
1046 | #define iscsi_conn_int_attr(field, param, format) \ | |
1047 | iscsi_conn_int_attr_show(param, format) \ | |
1048 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); | |
1049 | ||
1050 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
1051 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
1052 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
1053 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
1054 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
1055 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
1da177e4 | 1056 | |
7b8631b5 MC |
1057 | #define iscsi_cdev_to_session(_cdev) \ |
1058 | iscsi_dev_to_session(_cdev->dev) | |
1059 | ||
1da177e4 | 1060 | /* |
0896b752 | 1061 | * iSCSI session attrs |
1da177e4 | 1062 | */ |
0896b752 | 1063 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 1064 | static ssize_t \ |
0896b752 | 1065 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 1066 | { \ |
0896b752 | 1067 | uint32_t value = 0; \ |
7b8631b5 | 1068 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
7b8631b5 | 1069 | struct iscsi_transport *t = session->transport; \ |
1da177e4 | 1070 | \ |
7b7232f3 | 1071 | t->get_session_param(session, param, &value); \ |
0896b752 | 1072 | return snprintf(buf, 20, format"\n", value); \ |
1da177e4 LT |
1073 | } |
1074 | ||
0896b752 AA |
1075 | #define iscsi_session_int_attr(field, param, format) \ |
1076 | iscsi_session_int_attr_show(param, format) \ | |
1077 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); | |
1da177e4 | 1078 | |
0896b752 AA |
1079 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
1080 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
1081 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
1082 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
1083 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
1084 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
1085 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
1086 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
1da177e4 | 1087 | |
0896b752 AA |
1088 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
1089 | if (priv->param_mask & (1 << param)) { \ | |
1090 | priv->session_attrs[count] = &class_device_attr_##field;\ | |
1da177e4 LT |
1091 | count++; \ |
1092 | } | |
1093 | ||
0896b752 AA |
1094 | #define SETUP_CONN_RD_ATTR(field, param) \ |
1095 | if (priv->param_mask & (1 << param)) { \ | |
1096 | priv->conn_attrs[count] = &class_device_attr_##field; \ | |
1da177e4 LT |
1097 | count++; \ |
1098 | } | |
1099 | ||
0896b752 AA |
1100 | static int iscsi_session_match(struct attribute_container *cont, |
1101 | struct device *dev) | |
1da177e4 | 1102 | { |
7b8631b5 | 1103 | struct iscsi_cls_session *session; |
1da177e4 | 1104 | struct Scsi_Host *shost; |
0896b752 AA |
1105 | struct iscsi_internal *priv; |
1106 | ||
1107 | if (!iscsi_is_session_dev(dev)) | |
1108 | return 0; | |
1da177e4 | 1109 | |
7b8631b5 MC |
1110 | session = iscsi_dev_to_session(dev); |
1111 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1112 | if (!shost->transportt) |
1da177e4 LT |
1113 | return 0; |
1114 | ||
0896b752 AA |
1115 | priv = to_iscsi_internal(shost->transportt); |
1116 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1117 | return 0; |
1118 | ||
0896b752 | 1119 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1120 | } |
1121 | ||
0896b752 AA |
1122 | static int iscsi_conn_match(struct attribute_container *cont, |
1123 | struct device *dev) | |
1124 | { | |
7b8631b5 MC |
1125 | struct iscsi_cls_session *session; |
1126 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1127 | struct Scsi_Host *shost; |
0896b752 | 1128 | struct iscsi_internal *priv; |
1da177e4 | 1129 | |
0896b752 | 1130 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1131 | return 0; |
1132 | ||
7b8631b5 MC |
1133 | conn = iscsi_dev_to_conn(dev); |
1134 | session = iscsi_dev_to_session(conn->dev.parent); | |
1135 | shost = iscsi_session_to_shost(session); | |
1136 | ||
0896b752 | 1137 | if (!shost->transportt) |
1da177e4 LT |
1138 | return 0; |
1139 | ||
0896b752 AA |
1140 | priv = to_iscsi_internal(shost->transportt); |
1141 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1142 | return 0; | |
1da177e4 | 1143 | |
0896b752 AA |
1144 | return &priv->conn_cont.ac == cont; |
1145 | } | |
1146 | ||
7b8631b5 MC |
1147 | struct scsi_transport_template * |
1148 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1149 | { |
1150 | struct iscsi_internal *priv; | |
1151 | unsigned long flags; | |
1152 | int count = 0, err; | |
1153 | ||
1154 | BUG_ON(!tt); | |
1155 | ||
1156 | priv = iscsi_if_transport_lookup(tt); | |
1157 | if (priv) | |
7b8631b5 | 1158 | return NULL; |
0896b752 | 1159 | |
24669f75 | 1160 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1161 | if (!priv) |
7b8631b5 | 1162 | return NULL; |
0896b752 | 1163 | INIT_LIST_HEAD(&priv->list); |
0896b752 AA |
1164 | priv->iscsi_transport = tt; |
1165 | ||
1166 | priv->cdev.class = &iscsi_transport_class; | |
1167 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1168 | err = class_device_register(&priv->cdev); | |
1169 | if (err) | |
1170 | goto free_priv; | |
1171 | ||
1172 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1173 | if (err) | |
1174 | goto unregister_cdev; | |
1175 | ||
1176 | /* setup parameters mask */ | |
1177 | priv->param_mask = 0xFFFFFFFF; | |
1178 | if (!(tt->caps & CAP_MULTI_R2T)) | |
1179 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); | |
1180 | if (!(tt->caps & CAP_HDRDGST)) | |
1181 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); | |
1182 | if (!(tt->caps & CAP_DATADGST)) | |
1183 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); | |
1184 | if (!(tt->caps & CAP_MARKERS)) { | |
1185 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); | |
1186 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); | |
1187 | } | |
1da177e4 | 1188 | |
0896b752 AA |
1189 | /* connection parameters */ |
1190 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1191 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1192 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1193 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1194 | |
0896b752 AA |
1195 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1196 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1197 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1198 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1199 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1200 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1201 | ||
1202 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1203 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1204 | count = 0; |
1da177e4 | 1205 | |
0896b752 AA |
1206 | /* session parameters */ |
1207 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1208 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1209 | priv->session_cont.ac.match = iscsi_session_match; | |
1210 | transport_container_register(&priv->session_cont); | |
1211 | ||
1212 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1213 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1214 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1215 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1216 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1217 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1218 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) | |
1219 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); | |
1220 | ||
1221 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1222 | priv->session_attrs[count] = NULL; | |
1223 | ||
1224 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1225 | list_add(&priv->list, &iscsi_transports); | |
1226 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1227 | ||
1228 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1229 | return &priv->t; |
1da177e4 | 1230 | |
0896b752 AA |
1231 | unregister_cdev: |
1232 | class_device_unregister(&priv->cdev); | |
1233 | free_priv: | |
1234 | kfree(priv); | |
7b8631b5 | 1235 | return NULL; |
1da177e4 | 1236 | } |
0896b752 AA |
1237 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1238 | ||
1239 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1240 | { | |
1241 | struct iscsi_internal *priv; | |
1242 | unsigned long flags; | |
1243 | ||
1244 | BUG_ON(!tt); | |
1245 | ||
0b950672 | 1246 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1247 | |
1248 | priv = iscsi_if_transport_lookup(tt); | |
1249 | BUG_ON (!priv); | |
1250 | ||
0896b752 AA |
1251 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1252 | list_del(&priv->list); | |
1253 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1254 | ||
1255 | transport_container_unregister(&priv->conn_cont); | |
1256 | transport_container_unregister(&priv->session_cont); | |
1257 | ||
1258 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1259 | class_device_unregister(&priv->cdev); | |
0b950672 | 1260 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1261 | |
0896b752 AA |
1262 | return 0; |
1263 | } | |
1264 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1265 | |
0896b752 AA |
1266 | static int |
1267 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1268 | { |
0896b752 AA |
1269 | struct netlink_notify *n = ptr; |
1270 | ||
1271 | if (event == NETLINK_URELEASE && | |
1272 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1273 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1274 | unsigned long flags; |
1275 | ||
7b8631b5 | 1276 | mempool_zone_complete(z_reply); |
0896b752 AA |
1277 | spin_lock_irqsave(&connlock, flags); |
1278 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1279 | mempool_zone_complete(conn->z_error); |
1280 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1281 | } |
1282 | spin_unlock_irqrestore(&connlock, flags); | |
1283 | } | |
1da177e4 | 1284 | |
0896b752 | 1285 | return NOTIFY_DONE; |
1da177e4 LT |
1286 | } |
1287 | ||
0896b752 AA |
1288 | static struct notifier_block iscsi_nl_notifier = { |
1289 | .notifier_call = iscsi_rcv_nl_event, | |
1290 | }; | |
1da177e4 LT |
1291 | |
1292 | static __init int iscsi_transport_init(void) | |
1293 | { | |
0896b752 | 1294 | int err; |
1da177e4 | 1295 | |
0896b752 | 1296 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1297 | if (err) |
1298 | return err; | |
0896b752 AA |
1299 | |
1300 | err = transport_class_register(&iscsi_connection_class); | |
1301 | if (err) | |
1302 | goto unregister_transport_class; | |
1303 | ||
1304 | err = transport_class_register(&iscsi_session_class); | |
1305 | if (err) | |
1306 | goto unregister_conn_class; | |
1307 | ||
1308 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1309 | if (err) | |
1310 | goto unregister_session_class; | |
1311 | ||
2290d2b6 | 1312 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1313 | THIS_MODULE); |
0896b752 AA |
1314 | if (!nls) { |
1315 | err = -ENOBUFS; | |
1316 | goto unregister_notifier; | |
1317 | } | |
1318 | ||
7b8631b5 | 1319 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1320 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1321 | if (z_reply) |
0896b752 AA |
1322 | return 0; |
1323 | ||
1324 | sock_release(nls->sk_socket); | |
1325 | unregister_notifier: | |
1326 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1327 | unregister_session_class: | |
1328 | transport_class_unregister(&iscsi_session_class); | |
1329 | unregister_conn_class: | |
1330 | transport_class_unregister(&iscsi_connection_class); | |
1331 | unregister_transport_class: | |
1332 | class_unregister(&iscsi_transport_class); | |
1333 | return err; | |
1da177e4 LT |
1334 | } |
1335 | ||
1336 | static void __exit iscsi_transport_exit(void) | |
1337 | { | |
7b8631b5 | 1338 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1339 | sock_release(nls->sk_socket); |
1340 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1341 | transport_class_unregister(&iscsi_connection_class); | |
1342 | transport_class_unregister(&iscsi_session_class); | |
1343 | class_unregister(&iscsi_transport_class); | |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | module_init(iscsi_transport_init); | |
1347 | module_exit(iscsi_transport_exit); | |
1348 | ||
0896b752 AA |
1349 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1350 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1351 | "Alex Aizman <itn780@yahoo.com>"); | |
1352 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1353 | MODULE_LICENSE("GPL"); |