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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> | |
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; | |
41 | /* | |
42 | * List of sessions for this transport | |
43 | */ | |
44 | struct list_head sessions; | |
0896b752 AA |
45 | /* |
46 | * based on transport capabilities, at register time we set these | |
47 | * bits to tell the transport class it wants attributes displayed | |
48 | * in sysfs or that it can support different iSCSI Data-Path | |
49 | * capabilities | |
50 | */ | |
51 | uint32_t param_mask; | |
52 | ||
53 | struct class_device cdev; | |
1da177e4 LT |
54 | /* |
55 | * We do not have any private or other attrs. | |
56 | */ | |
0896b752 AA |
57 | struct transport_container conn_cont; |
58 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
59 | struct transport_container session_cont; | |
1da177e4 | 60 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
61 | }; |
62 | ||
0896b752 AA |
63 | /* |
64 | * list of registered transports and lock that must | |
65 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 66 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
67 | */ |
68 | static LIST_HEAD(iscsi_transports); | |
69 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
70 | ||
71 | #define to_iscsi_internal(tmpl) \ | |
72 | container_of(tmpl, struct iscsi_internal, t) | |
73 | ||
74 | #define cdev_to_iscsi_internal(_cdev) \ | |
75 | container_of(_cdev, struct iscsi_internal, cdev) | |
76 | ||
77 | static void iscsi_transport_release(struct class_device *cdev) | |
78 | { | |
79 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
80 | kfree(priv); | |
81 | } | |
1da177e4 | 82 | |
0896b752 AA |
83 | /* |
84 | * iscsi_transport_class represents the iscsi_transports that are | |
85 | * registered. | |
86 | */ | |
87 | static struct class iscsi_transport_class = { | |
88 | .name = "iscsi_transport", | |
89 | .release = iscsi_transport_release, | |
90 | }; | |
91 | ||
92 | static ssize_t | |
93 | show_transport_handle(struct class_device *cdev, char *buf) | |
94 | { | |
95 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 96 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
97 | } |
98 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
99 | ||
100 | #define show_transport_attr(name, format) \ | |
101 | static ssize_t \ | |
102 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
103 | { \ | |
104 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
105 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
106 | } \ | |
107 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
108 | ||
109 | show_transport_attr(caps, "0x%x"); | |
110 | show_transport_attr(max_lun, "%d"); | |
111 | show_transport_attr(max_conn, "%d"); | |
112 | show_transport_attr(max_cmd_len, "%d"); | |
113 | ||
114 | static struct attribute *iscsi_transport_attrs[] = { | |
115 | &class_device_attr_handle.attr, | |
116 | &class_device_attr_caps.attr, | |
117 | &class_device_attr_max_lun.attr, | |
118 | &class_device_attr_max_conn.attr, | |
119 | &class_device_attr_max_cmd_len.attr, | |
120 | NULL, | |
121 | }; | |
122 | ||
123 | static struct attribute_group iscsi_transport_group = { | |
124 | .attrs = iscsi_transport_attrs, | |
125 | }; | |
126 | ||
127 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, | |
128 | "iscsi_session", | |
1da177e4 LT |
129 | NULL, |
130 | NULL, | |
131 | NULL); | |
132 | ||
0896b752 AA |
133 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
134 | "iscsi_connection", | |
1da177e4 LT |
135 | NULL, |
136 | NULL, | |
137 | NULL); | |
0896b752 AA |
138 | |
139 | static struct sock *nls; | |
140 | static int daemon_pid; | |
0b950672 | 141 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
142 | |
143 | struct mempool_zone { | |
144 | mempool_t *pool; | |
145 | atomic_t allocated; | |
146 | int size; | |
147 | int hiwat; | |
148 | struct list_head freequeue; | |
149 | spinlock_t freelock; | |
150 | }; | |
151 | ||
7b8631b5 | 152 | static struct mempool_zone *z_reply; |
0896b752 | 153 | |
1da177e4 | 154 | /* |
0896b752 AA |
155 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
156 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
157 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
158 | * be able to predict or change operational behavior | |
1da177e4 | 159 | */ |
0896b752 AA |
160 | #define Z_MAX_REPLY 8 |
161 | #define Z_HIWAT_REPLY 6 | |
162 | #define Z_MAX_PDU 8 | |
163 | #define Z_HIWAT_PDU 6 | |
164 | #define Z_MAX_ERROR 16 | |
165 | #define Z_HIWAT_ERROR 12 | |
166 | ||
7b7232f3 MC |
167 | static LIST_HEAD(sesslist); |
168 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
169 | static LIST_HEAD(connlist); |
170 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 171 | |
7b7232f3 MC |
172 | static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle) |
173 | { | |
174 | unsigned long flags; | |
175 | struct iscsi_cls_session *sess; | |
176 | ||
177 | spin_lock_irqsave(&sesslock, flags); | |
178 | list_for_each_entry(sess, &sesslist, sess_list) { | |
179 | if (sess == iscsi_ptr(handle)) { | |
180 | spin_unlock_irqrestore(&sesslock, flags); | |
181 | return sess; | |
182 | } | |
183 | } | |
184 | spin_unlock_irqrestore(&sesslock, flags); | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint64_t handle) | |
189 | { | |
190 | unsigned long flags; | |
191 | struct iscsi_cls_conn *conn; | |
192 | ||
193 | spin_lock_irqsave(&connlock, flags); | |
194 | list_for_each_entry(conn, &connlist, conn_list) { | |
195 | if (conn == iscsi_ptr(handle)) { | |
196 | spin_unlock_irqrestore(&connlock, flags); | |
197 | return conn; | |
198 | } | |
199 | } | |
200 | spin_unlock_irqrestore(&connlock, flags); | |
201 | return NULL; | |
202 | } | |
203 | ||
7b8631b5 MC |
204 | /* |
205 | * The following functions can be used by LLDs that allocate | |
206 | * their own scsi_hosts or by software iscsi LLDs | |
207 | */ | |
208 | static void iscsi_session_release(struct device *dev) | |
209 | { | |
210 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
211 | struct iscsi_transport *transport = session->transport; | |
212 | struct Scsi_Host *shost; | |
0896b752 | 213 | |
7b8631b5 MC |
214 | shost = iscsi_session_to_shost(session); |
215 | scsi_host_put(shost); | |
216 | kfree(session); | |
217 | module_put(transport->owner); | |
218 | } | |
0896b752 | 219 | |
7b8631b5 MC |
220 | static int iscsi_is_session_dev(const struct device *dev) |
221 | { | |
222 | return dev->release == iscsi_session_release; | |
223 | } | |
0896b752 | 224 | |
7b8631b5 MC |
225 | /** |
226 | * iscsi_create_session - create iscsi class session | |
227 | * @shost: scsi host | |
228 | * @transport: iscsi transport | |
229 | * | |
230 | * This can be called from a LLD or iscsi_transport | |
231 | **/ | |
232 | struct iscsi_cls_session * | |
233 | iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) | |
234 | { | |
235 | struct iscsi_cls_session *session; | |
236 | int err; | |
237 | ||
238 | if (!try_module_get(transport->owner)) | |
239 | return NULL; | |
240 | ||
241 | session = kzalloc(sizeof(*session), GFP_KERNEL); | |
242 | if (!session) | |
243 | goto module_put; | |
244 | session->transport = transport; | |
245 | ||
246 | /* this is released in the dev's release function */ | |
247 | scsi_host_get(shost); | |
248 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); | |
249 | session->dev.parent = &shost->shost_gendev; | |
250 | session->dev.release = iscsi_session_release; | |
251 | err = device_register(&session->dev); | |
252 | if (err) { | |
253 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
254 | "register session's dev\n"); | |
255 | goto free_session; | |
256 | } | |
257 | transport_register_device(&session->dev); | |
258 | ||
259 | return session; | |
260 | ||
261 | free_session: | |
262 | kfree(session); | |
263 | module_put: | |
264 | module_put(transport->owner); | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
269 | ||
270 | /** | |
271 | * iscsi_destroy_session - destroy iscsi session | |
272 | * @session: iscsi_session | |
273 | * | |
274 | * Can be called by a LLD or iscsi_transport. There must not be | |
275 | * any running connections. | |
276 | **/ | |
277 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
278 | { | |
279 | transport_unregister_device(&session->dev); | |
280 | device_unregister(&session->dev); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
285 | ||
286 | static void iscsi_conn_release(struct device *dev) | |
287 | { | |
288 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
289 | struct device *parent = conn->dev.parent; | |
290 | ||
291 | kfree(conn); | |
292 | put_device(parent); | |
293 | } | |
294 | ||
295 | static int iscsi_is_conn_dev(const struct device *dev) | |
296 | { | |
297 | return dev->release == iscsi_conn_release; | |
298 | } | |
299 | ||
300 | /** | |
301 | * iscsi_create_conn - create iscsi class connection | |
302 | * @session: iscsi cls session | |
303 | * @cid: connection id | |
304 | * | |
305 | * This can be called from a LLD or iscsi_transport. The connection | |
306 | * is child of the session so cid must be unique for all connections | |
307 | * on the session. | |
308 | **/ | |
309 | struct iscsi_cls_conn * | |
310 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
311 | { | |
312 | struct iscsi_transport *transport = session->transport; | |
313 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
314 | struct iscsi_cls_conn *conn; | |
315 | int err; | |
316 | ||
317 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
318 | if (!conn) | |
319 | return NULL; | |
320 | ||
321 | if (transport->conndata_size) | |
322 | conn->dd_data = &conn[1]; | |
323 | ||
324 | INIT_LIST_HEAD(&conn->conn_list); | |
325 | conn->transport = transport; | |
326 | ||
327 | /* this is released in the dev's release function */ | |
328 | if (!get_device(&session->dev)) | |
329 | goto free_conn; | |
330 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", | |
331 | shost->host_no, cid); | |
332 | conn->dev.parent = &session->dev; | |
333 | conn->dev.release = iscsi_conn_release; | |
334 | err = device_register(&conn->dev); | |
335 | if (err) { | |
336 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
337 | "connection's dev\n"); | |
338 | goto release_parent_ref; | |
339 | } | |
340 | transport_register_device(&conn->dev); | |
341 | return conn; | |
342 | ||
343 | release_parent_ref: | |
344 | put_device(&session->dev); | |
345 | free_conn: | |
346 | kfree(conn); | |
347 | return NULL; | |
348 | } | |
349 | ||
350 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
351 | ||
352 | /** | |
353 | * iscsi_destroy_conn - destroy iscsi class connection | |
354 | * @session: iscsi cls session | |
355 | * | |
356 | * This can be called from a LLD or iscsi_transport. | |
357 | **/ | |
358 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
359 | { | |
360 | transport_unregister_device(&conn->dev); | |
361 | device_unregister(&conn->dev); | |
362 | return 0; | |
363 | } | |
364 | ||
365 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
366 | ||
367 | /* | |
368 | * These functions are used only by software iscsi_transports | |
369 | * which do not allocate and more their scsi_hosts since this | |
370 | * is initiated from userspace. | |
371 | */ | |
372 | ||
373 | /* | |
374 | * iSCSI Session's hostdata organization: | |
375 | * | |
376 | * *------------------* <== hostdata_session(host->hostdata) | |
377 | * | ptr to class sess| | |
378 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
379 | * | transport's data | | |
380 | * *------------------* | |
381 | */ | |
382 | ||
383 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
384 | _t->hostdata_size % sizeof(unsigned long)) | |
385 | ||
386 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
387 | ||
388 | /** | |
389 | * iscsi_transport_create_session - create iscsi cls session and host | |
390 | * scsit: scsi transport template | |
391 | * transport: iscsi transport template | |
392 | * | |
393 | * This can be used by software iscsi_transports that allocate | |
394 | * a session per scsi host. | |
395 | **/ | |
396 | struct Scsi_Host * | |
397 | iscsi_transport_create_session(struct scsi_transport_template *scsit, | |
398 | struct iscsi_transport *transport) | |
399 | { | |
400 | struct iscsi_cls_session *session; | |
401 | struct Scsi_Host *shost; | |
7b7232f3 | 402 | unsigned long flags; |
7b8631b5 MC |
403 | |
404 | shost = scsi_host_alloc(transport->host_template, | |
405 | hostdata_privsize(transport)); | |
406 | if (!shost) { | |
407 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
408 | "session\n"); | |
409 | return NULL; | |
410 | } | |
411 | ||
412 | shost->max_id = 1; | |
413 | shost->max_channel = 0; | |
414 | shost->max_lun = transport->max_lun; | |
415 | shost->max_cmd_len = transport->max_cmd_len; | |
416 | shost->transportt = scsit; | |
55e3299d | 417 | shost->transportt->create_work_queue = 1; |
7b8631b5 MC |
418 | |
419 | if (scsi_add_host(shost, NULL)) | |
420 | goto free_host; | |
421 | ||
422 | session = iscsi_create_session(shost, transport); | |
423 | if (!session) | |
424 | goto remove_host; | |
0896b752 | 425 | |
7b8631b5 | 426 | *(unsigned long*)shost->hostdata = (unsigned long)session; |
7b7232f3 MC |
427 | spin_lock_irqsave(&sesslock, flags); |
428 | list_add(&session->sess_list, &sesslist); | |
429 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
430 | return shost; |
431 | ||
432 | remove_host: | |
433 | scsi_remove_host(shost); | |
434 | free_host: | |
435 | scsi_host_put(shost); | |
436 | return NULL; | |
437 | } | |
0896b752 | 438 | |
7b8631b5 | 439 | EXPORT_SYMBOL_GPL(iscsi_transport_create_session); |
0896b752 | 440 | |
7b8631b5 MC |
441 | /** |
442 | * iscsi_transport_destroy_session - destroy session and scsi host | |
443 | * shost: scsi host | |
444 | * | |
445 | * This can be used by software iscsi_transports that allocate | |
446 | * a session per scsi host. | |
447 | **/ | |
448 | int iscsi_transport_destroy_session(struct Scsi_Host *shost) | |
449 | { | |
450 | struct iscsi_cls_session *session; | |
7b7232f3 | 451 | unsigned long flags; |
0896b752 | 452 | |
7b8631b5 MC |
453 | scsi_remove_host(shost); |
454 | session = hostdata_session(shost->hostdata); | |
7b7232f3 MC |
455 | spin_lock_irqsave(&sesslock, flags); |
456 | list_del(&session->sess_list); | |
457 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
458 | iscsi_destroy_session(session); |
459 | /* ref from host alloc */ | |
460 | scsi_host_put(shost); | |
461 | return 0; | |
462 | } | |
463 | ||
464 | EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session); | |
465 | ||
466 | /* | |
467 | * iscsi interface functions | |
468 | */ | |
0896b752 AA |
469 | static struct iscsi_internal * |
470 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
471 | { | |
472 | struct iscsi_internal *priv; | |
473 | unsigned long flags; | |
474 | ||
475 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
476 | list_for_each_entry(priv, &iscsi_transports, list) { | |
477 | if (tt == priv->iscsi_transport) { | |
478 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
479 | return priv; | |
480 | } | |
481 | } | |
482 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
483 | return NULL; | |
484 | } | |
1da177e4 | 485 | |
0896b752 AA |
486 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
487 | { | |
488 | return (struct list_head *)&skb->cb; | |
489 | } | |
1da177e4 | 490 | |
0896b752 | 491 | static void* |
7b8631b5 | 492 | mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data) |
0896b752 AA |
493 | { |
494 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 495 | |
0896b752 | 496 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
497 | } |
498 | ||
0896b752 AA |
499 | static void |
500 | mempool_zone_free_skb(void *element, void *pool_data) | |
501 | { | |
502 | kfree_skb(element); | |
503 | } | |
1da177e4 | 504 | |
0896b752 AA |
505 | static void |
506 | mempool_zone_complete(struct mempool_zone *zone) | |
507 | { | |
508 | unsigned long flags; | |
509 | struct list_head *lh, *n; | |
1da177e4 | 510 | |
0896b752 AA |
511 | spin_lock_irqsave(&zone->freelock, flags); |
512 | list_for_each_safe(lh, n, &zone->freequeue) { | |
513 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
514 | offsetof(struct sk_buff, cb)); | |
515 | if (!skb_shared(skb)) { | |
516 | list_del(skb_to_lh(skb)); | |
517 | mempool_free(skb, zone->pool); | |
518 | atomic_dec(&zone->allocated); | |
519 | } | |
520 | } | |
521 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
522 | } |
523 | ||
7b8631b5 MC |
524 | static struct mempool_zone * |
525 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 526 | { |
7b8631b5 MC |
527 | struct mempool_zone *zp; |
528 | ||
529 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
530 | if (!zp) | |
531 | return NULL; | |
532 | ||
0896b752 AA |
533 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
534 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
535 | if (!zp->pool) { |
536 | kfree(zp); | |
537 | return NULL; | |
538 | } | |
1da177e4 | 539 | |
0896b752 AA |
540 | zp->size = size; |
541 | zp->hiwat = hiwat; | |
1da177e4 | 542 | |
0896b752 AA |
543 | INIT_LIST_HEAD(&zp->freequeue); |
544 | spin_lock_init(&zp->freelock); | |
545 | atomic_set(&zp->allocated, 0); | |
546 | ||
7b8631b5 | 547 | return zp; |
0896b752 AA |
548 | } |
549 | ||
7b8631b5 MC |
550 | static void mempool_zone_destroy(struct mempool_zone *zp) |
551 | { | |
552 | mempool_destroy(zp->pool); | |
553 | kfree(zp); | |
554 | } | |
0896b752 AA |
555 | |
556 | static struct sk_buff* | |
557 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 558 | { |
0896b752 AA |
559 | struct sk_buff *skb; |
560 | ||
561 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
562 | if (skb) | |
563 | atomic_inc(&zone->allocated); | |
564 | return skb; | |
565 | } | |
1da177e4 | 566 | |
0896b752 AA |
567 | static int |
568 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
569 | { | |
570 | unsigned long flags; | |
571 | int rc; | |
1da177e4 | 572 | |
0896b752 AA |
573 | skb_get(skb); |
574 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
575 | if (rc < 0) { | |
576 | mempool_free(skb, zone->pool); | |
577 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
578 | return rc; | |
579 | } | |
580 | ||
581 | spin_lock_irqsave(&zone->freelock, flags); | |
582 | list_add(skb_to_lh(skb), &zone->freequeue); | |
583 | spin_unlock_irqrestore(&zone->freelock, flags); | |
584 | ||
585 | return 0; | |
1da177e4 | 586 | } |
1da177e4 | 587 | |
7b7232f3 | 588 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 589 | char *data, uint32_t data_size) |
1da177e4 | 590 | { |
0896b752 AA |
591 | struct nlmsghdr *nlh; |
592 | struct sk_buff *skb; | |
593 | struct iscsi_uevent *ev; | |
0896b752 AA |
594 | char *pdu; |
595 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
596 | data_size); | |
597 | ||
7b8631b5 | 598 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 599 | |
7b8631b5 | 600 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 601 | if (!skb) { |
7b7232f3 | 602 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
603 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
604 | "control PDU: OOM\n"); | |
0896b752 AA |
605 | return -ENOMEM; |
606 | } | |
1da177e4 | 607 | |
0896b752 AA |
608 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
609 | ev = NLMSG_DATA(nlh); | |
610 | memset(ev, 0, sizeof(*ev)); | |
611 | ev->transport_handle = iscsi_handle(conn->transport); | |
612 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 613 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 614 | ev->iferror = -ENOMEM; |
7b7232f3 | 615 | ev->r.recv_req.conn_handle = iscsi_handle(conn); |
0896b752 AA |
616 | pdu = (char*)ev + sizeof(*ev); |
617 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
618 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 619 | |
7b8631b5 | 620 | return iscsi_unicast_skb(conn->z_pdu, skb); |
1da177e4 | 621 | } |
0896b752 | 622 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 623 | |
7b7232f3 | 624 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 625 | { |
0896b752 AA |
626 | struct nlmsghdr *nlh; |
627 | struct sk_buff *skb; | |
628 | struct iscsi_uevent *ev; | |
0896b752 AA |
629 | int len = NLMSG_SPACE(sizeof(*ev)); |
630 | ||
7b8631b5 | 631 | mempool_zone_complete(conn->z_error); |
0896b752 | 632 | |
7b8631b5 | 633 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 634 | if (!skb) { |
7b8631b5 MC |
635 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
636 | "conn error (%d)\n", error); | |
0896b752 AA |
637 | return; |
638 | } | |
639 | ||
640 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
641 | ev = NLMSG_DATA(nlh); | |
642 | ev->transport_handle = iscsi_handle(conn->transport); | |
643 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 644 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
645 | ev->iferror = -ENOMEM; |
646 | ev->r.connerror.error = error; | |
7b7232f3 | 647 | ev->r.connerror.conn_handle = iscsi_handle(conn); |
1da177e4 | 648 | |
7b8631b5 | 649 | iscsi_unicast_skb(conn->z_error, skb); |
1da177e4 | 650 | |
7b8631b5 MC |
651 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
652 | error); | |
0896b752 AA |
653 | } |
654 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
655 | ||
656 | static int | |
657 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
658 | void *payload, int size) | |
659 | { | |
660 | struct sk_buff *skb; | |
661 | struct nlmsghdr *nlh; | |
662 | int len = NLMSG_SPACE(size); | |
663 | int flags = multi ? NLM_F_MULTI : 0; | |
664 | int t = done ? NLMSG_DONE : type; | |
665 | ||
7b8631b5 | 666 | mempool_zone_complete(z_reply); |
0896b752 | 667 | |
7b8631b5 | 668 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
669 | /* |
670 | * FIXME: | |
671 | * user is supposed to react on iferror == -ENOMEM; | |
672 | * see iscsi_if_rx(). | |
673 | */ | |
674 | BUG_ON(!skb); | |
675 | ||
676 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
677 | nlh->nlmsg_flags = flags; | |
678 | memcpy(NLMSG_DATA(nlh), payload, size); | |
7b8631b5 | 679 | return iscsi_unicast_skb(z_reply, skb); |
1da177e4 | 680 | } |
1da177e4 | 681 | |
7b8631b5 MC |
682 | static int |
683 | iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb, | |
684 | struct nlmsghdr *nlh) | |
685 | { | |
686 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
687 | struct iscsi_stats *stats; | |
688 | struct sk_buff *skbstat; | |
689 | struct iscsi_cls_conn *conn; | |
690 | struct nlmsghdr *nlhstat; | |
691 | struct iscsi_uevent *evstat; | |
692 | int len = NLMSG_SPACE(sizeof(*ev) + | |
693 | sizeof(struct iscsi_stats) + | |
694 | sizeof(struct iscsi_stats_custom) * | |
695 | ISCSI_STATS_CUSTOM_MAX); | |
696 | int err = 0; | |
0896b752 | 697 | |
7b7232f3 | 698 | conn = iscsi_conn_lookup(ev->u.get_stats.conn_handle); |
7b8631b5 MC |
699 | if (!conn) |
700 | return -EEXIST; | |
0896b752 | 701 | |
7b8631b5 MC |
702 | do { |
703 | int actual_size; | |
0896b752 | 704 | |
7b8631b5 | 705 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 706 | |
7b8631b5 MC |
707 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
708 | if (!skbstat) { | |
709 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
710 | "deliver stats: OOM\n"); | |
711 | return -ENOMEM; | |
712 | } | |
713 | ||
714 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
715 | (len - sizeof(*nlhstat)), 0); | |
716 | evstat = NLMSG_DATA(nlhstat); | |
717 | memset(evstat, 0, sizeof(*evstat)); | |
718 | evstat->transport_handle = iscsi_handle(conn->transport); | |
719 | evstat->type = nlh->nlmsg_type; | |
720 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
721 | evstat->iferror = -ENOMEM; | |
722 | evstat->u.get_stats.conn_handle = | |
723 | ev->u.get_stats.conn_handle; | |
724 | stats = (struct iscsi_stats *) | |
725 | ((char*)evstat + sizeof(*evstat)); | |
726 | memset(stats, 0, sizeof(*stats)); | |
727 | ||
7b7232f3 | 728 | transport->get_stats(conn, stats); |
7b8631b5 MC |
729 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
730 | sizeof(struct iscsi_stats) + | |
731 | sizeof(struct iscsi_stats_custom) * | |
732 | stats->custom_length); | |
733 | actual_size -= sizeof(*nlhstat); | |
734 | actual_size = NLMSG_LENGTH(actual_size); | |
735 | skb_trim(skb, NLMSG_ALIGN(actual_size)); | |
736 | nlhstat->nlmsg_len = actual_size; | |
737 | ||
738 | err = iscsi_unicast_skb(conn->z_pdu, skbstat); | |
739 | } while (err < 0 && err != -ECONNREFUSED); | |
740 | ||
741 | return err; | |
0896b752 AA |
742 | } |
743 | ||
744 | static int | |
745 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
746 | { | |
747 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 MC |
748 | struct iscsi_cls_session *session; |
749 | uint32_t sid; | |
0896b752 | 750 | |
7b7232f3 MC |
751 | session = transport->create_session(&priv->t, |
752 | ev->u.c_session.initial_cmdsn, | |
753 | &sid); | |
754 | if (!session) | |
7b8631b5 | 755 | return -ENOMEM; |
0896b752 | 756 | |
7b7232f3 MC |
757 | ev->r.c_session_ret.session_handle = iscsi_handle(session); |
758 | ev->r.c_session_ret.sid = sid; | |
0896b752 | 759 | return 0; |
0896b752 AA |
760 | } |
761 | ||
762 | static int | |
7b7232f3 | 763 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 764 | { |
7b8631b5 | 765 | struct iscsi_cls_conn *conn; |
7b7232f3 | 766 | struct iscsi_cls_session *session; |
0896b752 | 767 | unsigned long flags; |
7b8631b5 | 768 | |
7b7232f3 MC |
769 | session = iscsi_session_lookup(ev->u.c_conn.session_handle); |
770 | if (!session) | |
7b8631b5 | 771 | return -EINVAL; |
0896b752 | 772 | |
7b7232f3 | 773 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
7b8631b5 | 774 | if (!conn) |
7b7232f3 | 775 | return -ENOMEM; |
0896b752 | 776 | |
7b8631b5 | 777 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
778 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
779 | sizeof(struct iscsi_hdr) + | |
780 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
781 | Z_HIWAT_PDU); | |
7b8631b5 MC |
782 | if (!conn->z_pdu) { |
783 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
784 | "pdu zone for new conn\n"); | |
785 | goto destroy_conn; | |
0896b752 | 786 | } |
7b8631b5 MC |
787 | |
788 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
789 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
790 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
791 | if (!conn->z_error) { |
792 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
793 | "error zone for new conn\n"); | |
794 | goto free_pdu_pool; | |
0896b752 AA |
795 | } |
796 | ||
7b7232f3 | 797 | ev->r.handle = iscsi_handle(conn); |
0896b752 AA |
798 | |
799 | spin_lock_irqsave(&connlock, flags); | |
800 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
801 | conn->active = 1; |
802 | spin_unlock_irqrestore(&connlock, flags); | |
803 | ||
0896b752 AA |
804 | return 0; |
805 | ||
7b8631b5 MC |
806 | free_pdu_pool: |
807 | mempool_zone_destroy(conn->z_pdu); | |
808 | destroy_conn: | |
809 | if (transport->destroy_conn) | |
810 | transport->destroy_conn(conn->dd_data); | |
7b8631b5 | 811 | return -ENOMEM; |
1da177e4 LT |
812 | } |
813 | ||
0896b752 AA |
814 | static int |
815 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
816 | { | |
817 | unsigned long flags; | |
7b8631b5 MC |
818 | struct iscsi_cls_conn *conn; |
819 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 | 820 | |
7b7232f3 | 821 | conn = iscsi_conn_lookup(ev->u.d_conn.conn_handle); |
0896b752 | 822 | if (!conn) |
7b8631b5 | 823 | return -EINVAL; |
0896b752 AA |
824 | spin_lock_irqsave(&connlock, flags); |
825 | conn->active = 0; | |
826 | list_del(&conn->conn_list); | |
827 | spin_unlock_irqrestore(&connlock, flags); | |
828 | ||
7b8631b5 MC |
829 | z_pdu = conn->z_pdu; |
830 | z_error = conn->z_error; | |
0896b752 | 831 | |
7b8631b5 MC |
832 | if (transport->destroy_conn) |
833 | transport->destroy_conn(conn); | |
0896b752 | 834 | |
7b8631b5 MC |
835 | mempool_zone_destroy(z_pdu); |
836 | mempool_zone_destroy(z_error); | |
0896b752 | 837 | |
7b8631b5 | 838 | return 0; |
0896b752 AA |
839 | } |
840 | ||
841 | static int | |
842 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
843 | { | |
844 | int err = 0; | |
845 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
846 | struct iscsi_transport *transport = NULL; | |
847 | struct iscsi_internal *priv; | |
7b7232f3 MC |
848 | struct iscsi_cls_session *session; |
849 | struct iscsi_cls_conn *conn; | |
0896b752 AA |
850 | |
851 | if (NETLINK_CREDS(skb)->uid) | |
852 | return -EPERM; | |
853 | ||
854 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); | |
855 | if (!priv) | |
856 | return -EINVAL; | |
857 | transport = priv->iscsi_transport; | |
858 | ||
7b7232f3 MC |
859 | if (!try_module_get(transport->owner)) |
860 | return -EINVAL; | |
861 | ||
0896b752 AA |
862 | daemon_pid = NETLINK_CREDS(skb)->pid; |
863 | ||
864 | switch (nlh->nlmsg_type) { | |
865 | case ISCSI_UEVENT_CREATE_SESSION: | |
866 | err = iscsi_if_create_session(priv, ev); | |
867 | break; | |
868 | case ISCSI_UEVENT_DESTROY_SESSION: | |
7b7232f3 MC |
869 | session = iscsi_session_lookup(ev->u.d_session.session_handle); |
870 | if (session) | |
871 | transport->destroy_session(session); | |
872 | else | |
873 | err = -EINVAL; | |
0896b752 AA |
874 | break; |
875 | case ISCSI_UEVENT_CREATE_CONN: | |
876 | err = iscsi_if_create_conn(transport, ev); | |
877 | break; | |
878 | case ISCSI_UEVENT_DESTROY_CONN: | |
879 | err = iscsi_if_destroy_conn(transport, ev); | |
880 | break; | |
881 | case ISCSI_UEVENT_BIND_CONN: | |
7b7232f3 MC |
882 | session = iscsi_session_lookup(ev->u.b_conn.session_handle); |
883 | conn = iscsi_conn_lookup(ev->u.b_conn.conn_handle); | |
884 | ||
885 | if (session && conn) | |
886 | ev->r.retcode = transport->bind_conn(session, conn, | |
887 | ev->u.b_conn.transport_fd, | |
888 | ev->u.b_conn.is_leading); | |
889 | else | |
890 | err = -EINVAL; | |
0896b752 AA |
891 | break; |
892 | case ISCSI_UEVENT_SET_PARAM: | |
7b7232f3 MC |
893 | conn = iscsi_conn_lookup(ev->u.set_param.conn_handle); |
894 | if (conn) | |
895 | ev->r.retcode = transport->set_param(conn, | |
896 | ev->u.set_param.param, ev->u.set_param.value); | |
897 | else | |
898 | err = -EINVAL; | |
0896b752 AA |
899 | break; |
900 | case ISCSI_UEVENT_START_CONN: | |
7b7232f3 MC |
901 | conn = iscsi_conn_lookup(ev->u.start_conn.conn_handle); |
902 | if (conn) | |
903 | ev->r.retcode = transport->start_conn(conn); | |
904 | else | |
905 | err = -EINVAL; | |
906 | ||
0896b752 AA |
907 | break; |
908 | case ISCSI_UEVENT_STOP_CONN: | |
7b7232f3 MC |
909 | conn = iscsi_conn_lookup(ev->u.stop_conn.conn_handle); |
910 | if (conn) | |
911 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
912 | else | |
913 | err = -EINVAL; | |
0896b752 AA |
914 | break; |
915 | case ISCSI_UEVENT_SEND_PDU: | |
7b7232f3 MC |
916 | conn = iscsi_conn_lookup(ev->u.send_pdu.conn_handle); |
917 | if (conn) | |
918 | ev->r.retcode = transport->send_pdu(conn, | |
919 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
920 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
921 | ev->u.send_pdu.data_size); | |
922 | else | |
923 | err = -EINVAL; | |
0896b752 AA |
924 | break; |
925 | case ISCSI_UEVENT_GET_STATS: | |
926 | err = iscsi_if_get_stats(transport, skb, nlh); | |
927 | break; | |
928 | default: | |
929 | err = -EINVAL; | |
930 | break; | |
931 | } | |
932 | ||
7b7232f3 | 933 | module_put(transport->owner); |
0896b752 AA |
934 | return err; |
935 | } | |
936 | ||
937 | /* Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
938 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are | |
939 | * discarded silently. */ | |
940 | static void | |
941 | iscsi_if_rx(struct sock *sk, int len) | |
942 | { | |
943 | struct sk_buff *skb; | |
1da177e4 | 944 | |
0b950672 | 945 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
946 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
947 | while (skb->len >= NLMSG_SPACE(0)) { | |
948 | int err; | |
949 | uint32_t rlen; | |
950 | struct nlmsghdr *nlh; | |
951 | struct iscsi_uevent *ev; | |
952 | ||
953 | nlh = (struct nlmsghdr *)skb->data; | |
954 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
955 | skb->len < nlh->nlmsg_len) { | |
956 | break; | |
957 | } | |
958 | ev = NLMSG_DATA(nlh); | |
959 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
960 | if (rlen > skb->len) | |
961 | rlen = skb->len; | |
962 | err = iscsi_if_recv_msg(skb, nlh); | |
963 | if (err) { | |
964 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
965 | ev->iferror = err; | |
966 | } | |
967 | do { | |
968 | /* | |
969 | * special case for GET_STATS: | |
970 | * on success - sending reply and stats from | |
971 | * inside of if_recv_msg(), | |
972 | * on error - fall through. | |
973 | */ | |
974 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
975 | break; | |
976 | err = iscsi_if_send_reply( | |
977 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
978 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
979 | if (atomic_read(&z_reply->allocated) >= |
980 | z_reply->hiwat) | |
0896b752 AA |
981 | ev->iferror = -ENOMEM; |
982 | } while (err < 0 && err != -ECONNREFUSED); | |
983 | skb_pull(skb, rlen); | |
984 | } | |
985 | kfree_skb(skb); | |
986 | } | |
0b950672 | 987 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 988 | } |
1da177e4 | 989 | |
7b8631b5 MC |
990 | #define iscsi_cdev_to_conn(_cdev) \ |
991 | iscsi_dev_to_conn(_cdev->dev) | |
992 | ||
1da177e4 | 993 | /* |
0896b752 | 994 | * iSCSI connection attrs |
1da177e4 | 995 | */ |
0896b752 AA |
996 | #define iscsi_conn_int_attr_show(param, format) \ |
997 | static ssize_t \ | |
998 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
999 | { \ | |
1000 | uint32_t value = 0; \ | |
7b8631b5 MC |
1001 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1002 | struct iscsi_transport *t = conn->transport; \ | |
0896b752 | 1003 | \ |
7b7232f3 | 1004 | t->get_conn_param(conn, param, &value); \ |
0896b752 AA |
1005 | return snprintf(buf, 20, format"\n", value); \ |
1006 | } | |
1007 | ||
1008 | #define iscsi_conn_int_attr(field, param, format) \ | |
1009 | iscsi_conn_int_attr_show(param, format) \ | |
1010 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); | |
1011 | ||
1012 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
1013 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
1014 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
1015 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
1016 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
1017 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
1da177e4 | 1018 | |
7b8631b5 MC |
1019 | #define iscsi_cdev_to_session(_cdev) \ |
1020 | iscsi_dev_to_session(_cdev->dev) | |
1021 | ||
1da177e4 | 1022 | /* |
0896b752 | 1023 | * iSCSI session attrs |
1da177e4 | 1024 | */ |
0896b752 | 1025 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 1026 | static ssize_t \ |
0896b752 | 1027 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 1028 | { \ |
0896b752 | 1029 | uint32_t value = 0; \ |
7b8631b5 | 1030 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
7b8631b5 | 1031 | struct iscsi_transport *t = session->transport; \ |
1da177e4 | 1032 | \ |
7b7232f3 | 1033 | t->get_session_param(session, param, &value); \ |
0896b752 | 1034 | return snprintf(buf, 20, format"\n", value); \ |
1da177e4 LT |
1035 | } |
1036 | ||
0896b752 AA |
1037 | #define iscsi_session_int_attr(field, param, format) \ |
1038 | iscsi_session_int_attr_show(param, format) \ | |
1039 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); | |
1da177e4 | 1040 | |
0896b752 AA |
1041 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
1042 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
1043 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
1044 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
1045 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
1046 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
1047 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
1048 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
1da177e4 | 1049 | |
0896b752 AA |
1050 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
1051 | if (priv->param_mask & (1 << param)) { \ | |
1052 | priv->session_attrs[count] = &class_device_attr_##field;\ | |
1da177e4 LT |
1053 | count++; \ |
1054 | } | |
1055 | ||
0896b752 AA |
1056 | #define SETUP_CONN_RD_ATTR(field, param) \ |
1057 | if (priv->param_mask & (1 << param)) { \ | |
1058 | priv->conn_attrs[count] = &class_device_attr_##field; \ | |
1da177e4 LT |
1059 | count++; \ |
1060 | } | |
1061 | ||
0896b752 AA |
1062 | static int iscsi_session_match(struct attribute_container *cont, |
1063 | struct device *dev) | |
1da177e4 | 1064 | { |
7b8631b5 | 1065 | struct iscsi_cls_session *session; |
1da177e4 | 1066 | struct Scsi_Host *shost; |
0896b752 AA |
1067 | struct iscsi_internal *priv; |
1068 | ||
1069 | if (!iscsi_is_session_dev(dev)) | |
1070 | return 0; | |
1da177e4 | 1071 | |
7b8631b5 MC |
1072 | session = iscsi_dev_to_session(dev); |
1073 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1074 | if (!shost->transportt) |
1da177e4 LT |
1075 | return 0; |
1076 | ||
0896b752 AA |
1077 | priv = to_iscsi_internal(shost->transportt); |
1078 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1079 | return 0; |
1080 | ||
0896b752 | 1081 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1082 | } |
1083 | ||
0896b752 AA |
1084 | static int iscsi_conn_match(struct attribute_container *cont, |
1085 | struct device *dev) | |
1086 | { | |
7b8631b5 MC |
1087 | struct iscsi_cls_session *session; |
1088 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1089 | struct Scsi_Host *shost; |
0896b752 | 1090 | struct iscsi_internal *priv; |
1da177e4 | 1091 | |
0896b752 | 1092 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1093 | return 0; |
1094 | ||
7b8631b5 MC |
1095 | conn = iscsi_dev_to_conn(dev); |
1096 | session = iscsi_dev_to_session(conn->dev.parent); | |
1097 | shost = iscsi_session_to_shost(session); | |
1098 | ||
0896b752 | 1099 | if (!shost->transportt) |
1da177e4 LT |
1100 | return 0; |
1101 | ||
0896b752 AA |
1102 | priv = to_iscsi_internal(shost->transportt); |
1103 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1104 | return 0; | |
1da177e4 | 1105 | |
0896b752 AA |
1106 | return &priv->conn_cont.ac == cont; |
1107 | } | |
1108 | ||
7b8631b5 MC |
1109 | struct scsi_transport_template * |
1110 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1111 | { |
1112 | struct iscsi_internal *priv; | |
1113 | unsigned long flags; | |
1114 | int count = 0, err; | |
1115 | ||
1116 | BUG_ON(!tt); | |
1117 | ||
1118 | priv = iscsi_if_transport_lookup(tt); | |
1119 | if (priv) | |
7b8631b5 | 1120 | return NULL; |
0896b752 AA |
1121 | |
1122 | priv = kmalloc(sizeof(*priv), GFP_KERNEL); | |
1123 | if (!priv) | |
7b8631b5 | 1124 | return NULL; |
0896b752 AA |
1125 | memset(priv, 0, sizeof(*priv)); |
1126 | INIT_LIST_HEAD(&priv->list); | |
1127 | INIT_LIST_HEAD(&priv->sessions); | |
0896b752 AA |
1128 | priv->iscsi_transport = tt; |
1129 | ||
1130 | priv->cdev.class = &iscsi_transport_class; | |
1131 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1132 | err = class_device_register(&priv->cdev); | |
1133 | if (err) | |
1134 | goto free_priv; | |
1135 | ||
1136 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1137 | if (err) | |
1138 | goto unregister_cdev; | |
1139 | ||
1140 | /* setup parameters mask */ | |
1141 | priv->param_mask = 0xFFFFFFFF; | |
1142 | if (!(tt->caps & CAP_MULTI_R2T)) | |
1143 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); | |
1144 | if (!(tt->caps & CAP_HDRDGST)) | |
1145 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); | |
1146 | if (!(tt->caps & CAP_DATADGST)) | |
1147 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); | |
1148 | if (!(tt->caps & CAP_MARKERS)) { | |
1149 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); | |
1150 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); | |
1151 | } | |
1da177e4 | 1152 | |
0896b752 AA |
1153 | /* connection parameters */ |
1154 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1155 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1156 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1157 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1158 | |
0896b752 AA |
1159 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1160 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1161 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1162 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1163 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1164 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1165 | ||
1166 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1167 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1168 | count = 0; |
1da177e4 | 1169 | |
0896b752 AA |
1170 | /* session parameters */ |
1171 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1172 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1173 | priv->session_cont.ac.match = iscsi_session_match; | |
1174 | transport_container_register(&priv->session_cont); | |
1175 | ||
1176 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1177 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1178 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1179 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1180 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1181 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1182 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) | |
1183 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); | |
1184 | ||
1185 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1186 | priv->session_attrs[count] = NULL; | |
1187 | ||
1188 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1189 | list_add(&priv->list, &iscsi_transports); | |
1190 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1191 | ||
1192 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1193 | return &priv->t; |
1da177e4 | 1194 | |
0896b752 AA |
1195 | unregister_cdev: |
1196 | class_device_unregister(&priv->cdev); | |
1197 | free_priv: | |
1198 | kfree(priv); | |
7b8631b5 | 1199 | return NULL; |
1da177e4 | 1200 | } |
0896b752 AA |
1201 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1202 | ||
1203 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1204 | { | |
1205 | struct iscsi_internal *priv; | |
1206 | unsigned long flags; | |
1207 | ||
1208 | BUG_ON(!tt); | |
1209 | ||
0b950672 | 1210 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1211 | |
1212 | priv = iscsi_if_transport_lookup(tt); | |
1213 | BUG_ON (!priv); | |
1214 | ||
0896b752 AA |
1215 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1216 | list_del(&priv->list); | |
1217 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1218 | ||
1219 | transport_container_unregister(&priv->conn_cont); | |
1220 | transport_container_unregister(&priv->session_cont); | |
1221 | ||
1222 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1223 | class_device_unregister(&priv->cdev); | |
0b950672 | 1224 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1225 | |
0896b752 AA |
1226 | return 0; |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1229 | |
0896b752 AA |
1230 | static int |
1231 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1232 | { |
0896b752 AA |
1233 | struct netlink_notify *n = ptr; |
1234 | ||
1235 | if (event == NETLINK_URELEASE && | |
1236 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1237 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1238 | unsigned long flags; |
1239 | ||
7b8631b5 | 1240 | mempool_zone_complete(z_reply); |
0896b752 AA |
1241 | spin_lock_irqsave(&connlock, flags); |
1242 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1243 | mempool_zone_complete(conn->z_error); |
1244 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1245 | } |
1246 | spin_unlock_irqrestore(&connlock, flags); | |
1247 | } | |
1da177e4 | 1248 | |
0896b752 | 1249 | return NOTIFY_DONE; |
1da177e4 LT |
1250 | } |
1251 | ||
0896b752 AA |
1252 | static struct notifier_block iscsi_nl_notifier = { |
1253 | .notifier_call = iscsi_rcv_nl_event, | |
1254 | }; | |
1da177e4 LT |
1255 | |
1256 | static __init int iscsi_transport_init(void) | |
1257 | { | |
0896b752 | 1258 | int err; |
1da177e4 | 1259 | |
0896b752 | 1260 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1261 | if (err) |
1262 | return err; | |
0896b752 AA |
1263 | |
1264 | err = transport_class_register(&iscsi_connection_class); | |
1265 | if (err) | |
1266 | goto unregister_transport_class; | |
1267 | ||
1268 | err = transport_class_register(&iscsi_session_class); | |
1269 | if (err) | |
1270 | goto unregister_conn_class; | |
1271 | ||
1272 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1273 | if (err) | |
1274 | goto unregister_session_class; | |
1275 | ||
2290d2b6 | 1276 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1277 | THIS_MODULE); |
0896b752 AA |
1278 | if (!nls) { |
1279 | err = -ENOBUFS; | |
1280 | goto unregister_notifier; | |
1281 | } | |
1282 | ||
7b8631b5 | 1283 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1284 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1285 | if (z_reply) |
0896b752 AA |
1286 | return 0; |
1287 | ||
1288 | sock_release(nls->sk_socket); | |
1289 | unregister_notifier: | |
1290 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1291 | unregister_session_class: | |
1292 | transport_class_unregister(&iscsi_session_class); | |
1293 | unregister_conn_class: | |
1294 | transport_class_unregister(&iscsi_connection_class); | |
1295 | unregister_transport_class: | |
1296 | class_unregister(&iscsi_transport_class); | |
1297 | return err; | |
1da177e4 LT |
1298 | } |
1299 | ||
1300 | static void __exit iscsi_transport_exit(void) | |
1301 | { | |
7b8631b5 | 1302 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1303 | sock_release(nls->sk_socket); |
1304 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1305 | transport_class_unregister(&iscsi_connection_class); | |
1306 | transport_class_unregister(&iscsi_session_class); | |
1307 | class_unregister(&iscsi_transport_class); | |
1da177e4 LT |
1308 | } |
1309 | ||
1310 | module_init(iscsi_transport_init); | |
1311 | module_exit(iscsi_transport_exit); | |
1312 | ||
0896b752 AA |
1313 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1314 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1315 | "Alex Aizman <itn780@yahoo.com>"); | |
1316 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1317 | MODULE_LICENSE("GPL"); |