Commit | Line | Data |
---|---|---|
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> | |
4e57b681 TS |
24 | #include <linux/string.h> |
25 | #include <linux/slab.h> | |
0896b752 | 26 | #include <linux/mempool.h> |
0b950672 | 27 | #include <linux/mutex.h> |
0896b752 | 28 | #include <net/tcp.h> |
4e57b681 | 29 | |
1da177e4 LT |
30 | #include <scsi/scsi.h> |
31 | #include <scsi/scsi_host.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_transport.h> | |
34 | #include <scsi/scsi_transport_iscsi.h> | |
0896b752 | 35 | #include <scsi/iscsi_if.h> |
1da177e4 | 36 | |
0896b752 AA |
37 | #define ISCSI_SESSION_ATTRS 8 |
38 | #define ISCSI_CONN_ATTRS 6 | |
1da177e4 LT |
39 | |
40 | struct iscsi_internal { | |
41 | struct scsi_transport_template t; | |
0896b752 AA |
42 | struct iscsi_transport *iscsi_transport; |
43 | struct list_head list; | |
44 | /* | |
45 | * List of sessions for this transport | |
46 | */ | |
47 | struct list_head sessions; | |
48 | /* | |
49 | * lock to serialize access to the sessions list which must | |
0b950672 | 50 | * be taken after the rx_queue_mutex |
0896b752 AA |
51 | */ |
52 | spinlock_t session_lock; | |
53 | /* | |
54 | * based on transport capabilities, at register time we set these | |
55 | * bits to tell the transport class it wants attributes displayed | |
56 | * in sysfs or that it can support different iSCSI Data-Path | |
57 | * capabilities | |
58 | */ | |
59 | uint32_t param_mask; | |
60 | ||
61 | struct class_device cdev; | |
1da177e4 LT |
62 | /* |
63 | * We do not have any private or other attrs. | |
64 | */ | |
0896b752 AA |
65 | struct transport_container conn_cont; |
66 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
67 | struct transport_container session_cont; | |
1da177e4 | 68 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
69 | }; |
70 | ||
0896b752 AA |
71 | /* |
72 | * list of registered transports and lock that must | |
73 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 74 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
75 | */ |
76 | static LIST_HEAD(iscsi_transports); | |
77 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
78 | ||
79 | #define to_iscsi_internal(tmpl) \ | |
80 | container_of(tmpl, struct iscsi_internal, t) | |
81 | ||
82 | #define cdev_to_iscsi_internal(_cdev) \ | |
83 | container_of(_cdev, struct iscsi_internal, cdev) | |
84 | ||
85 | static void iscsi_transport_release(struct class_device *cdev) | |
86 | { | |
87 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
88 | kfree(priv); | |
89 | } | |
1da177e4 | 90 | |
0896b752 AA |
91 | /* |
92 | * iscsi_transport_class represents the iscsi_transports that are | |
93 | * registered. | |
94 | */ | |
95 | static struct class iscsi_transport_class = { | |
96 | .name = "iscsi_transport", | |
97 | .release = iscsi_transport_release, | |
98 | }; | |
99 | ||
100 | static ssize_t | |
101 | show_transport_handle(struct class_device *cdev, char *buf) | |
102 | { | |
103 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 104 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
105 | } |
106 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
107 | ||
108 | #define show_transport_attr(name, format) \ | |
109 | static ssize_t \ | |
110 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
111 | { \ | |
112 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
113 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
114 | } \ | |
115 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
116 | ||
117 | show_transport_attr(caps, "0x%x"); | |
118 | show_transport_attr(max_lun, "%d"); | |
119 | show_transport_attr(max_conn, "%d"); | |
120 | show_transport_attr(max_cmd_len, "%d"); | |
121 | ||
122 | static struct attribute *iscsi_transport_attrs[] = { | |
123 | &class_device_attr_handle.attr, | |
124 | &class_device_attr_caps.attr, | |
125 | &class_device_attr_max_lun.attr, | |
126 | &class_device_attr_max_conn.attr, | |
127 | &class_device_attr_max_cmd_len.attr, | |
128 | NULL, | |
129 | }; | |
130 | ||
131 | static struct attribute_group iscsi_transport_group = { | |
132 | .attrs = iscsi_transport_attrs, | |
133 | }; | |
134 | ||
135 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, | |
136 | "iscsi_session", | |
1da177e4 LT |
137 | NULL, |
138 | NULL, | |
139 | NULL); | |
140 | ||
0896b752 AA |
141 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
142 | "iscsi_connection", | |
1da177e4 LT |
143 | NULL, |
144 | NULL, | |
145 | NULL); | |
0896b752 AA |
146 | |
147 | static struct sock *nls; | |
148 | static int daemon_pid; | |
0b950672 | 149 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
150 | |
151 | struct mempool_zone { | |
152 | mempool_t *pool; | |
153 | atomic_t allocated; | |
154 | int size; | |
155 | int hiwat; | |
156 | struct list_head freequeue; | |
157 | spinlock_t freelock; | |
158 | }; | |
159 | ||
160 | static struct mempool_zone z_reply; | |
161 | ||
1da177e4 | 162 | /* |
0896b752 AA |
163 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
164 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
165 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
166 | * be able to predict or change operational behavior | |
1da177e4 | 167 | */ |
0896b752 AA |
168 | #define Z_MAX_REPLY 8 |
169 | #define Z_HIWAT_REPLY 6 | |
170 | #define Z_MAX_PDU 8 | |
171 | #define Z_HIWAT_PDU 6 | |
172 | #define Z_MAX_ERROR 16 | |
173 | #define Z_HIWAT_ERROR 12 | |
174 | ||
175 | struct iscsi_if_conn { | |
176 | struct list_head conn_list; /* item in connlist */ | |
177 | struct list_head session_list; /* item in session->connections */ | |
178 | iscsi_connh_t connh; | |
179 | int active; /* must be accessed with the connlock */ | |
180 | struct Scsi_Host *host; /* originated shost */ | |
181 | struct device dev; /* sysfs transport/container device */ | |
182 | struct iscsi_transport *transport; | |
183 | struct mempool_zone z_error; | |
184 | struct mempool_zone z_pdu; | |
185 | struct list_head freequeue; | |
186 | }; | |
187 | ||
188 | #define iscsi_dev_to_if_conn(_dev) \ | |
189 | container_of(_dev, struct iscsi_if_conn, dev) | |
190 | ||
191 | #define iscsi_cdev_to_if_conn(_cdev) \ | |
192 | iscsi_dev_to_if_conn(_cdev->dev) | |
193 | ||
194 | static LIST_HEAD(connlist); | |
195 | static DEFINE_SPINLOCK(connlock); | |
196 | ||
197 | struct iscsi_if_session { | |
198 | struct list_head list; /* item in session_list */ | |
199 | struct list_head connections; | |
200 | iscsi_sessionh_t sessionh; | |
201 | struct iscsi_transport *transport; | |
202 | struct device dev; /* sysfs transport/container device */ | |
203 | }; | |
204 | ||
205 | #define iscsi_dev_to_if_session(_dev) \ | |
206 | container_of(_dev, struct iscsi_if_session, dev) | |
207 | ||
208 | #define iscsi_cdev_to_if_session(_cdev) \ | |
209 | iscsi_dev_to_if_session(_cdev->dev) | |
210 | ||
211 | #define iscsi_if_session_to_shost(_session) \ | |
212 | dev_to_shost(_session->dev.parent) | |
213 | ||
214 | static struct iscsi_if_conn* | |
215 | iscsi_if_find_conn(uint64_t key) | |
216 | { | |
217 | unsigned long flags; | |
218 | struct iscsi_if_conn *conn; | |
219 | ||
220 | spin_lock_irqsave(&connlock, flags); | |
221 | list_for_each_entry(conn, &connlist, conn_list) | |
222 | if (conn->connh == key) { | |
223 | spin_unlock_irqrestore(&connlock, flags); | |
224 | return conn; | |
225 | } | |
226 | spin_unlock_irqrestore(&connlock, flags); | |
227 | return NULL; | |
1da177e4 LT |
228 | } |
229 | ||
0896b752 AA |
230 | static struct iscsi_internal * |
231 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
232 | { | |
233 | struct iscsi_internal *priv; | |
234 | unsigned long flags; | |
235 | ||
236 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
237 | list_for_each_entry(priv, &iscsi_transports, list) { | |
238 | if (tt == priv->iscsi_transport) { | |
239 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
240 | return priv; | |
241 | } | |
242 | } | |
243 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
244 | return NULL; | |
245 | } | |
1da177e4 | 246 | |
0896b752 AA |
247 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
248 | { | |
249 | return (struct list_head *)&skb->cb; | |
250 | } | |
1da177e4 | 251 | |
0896b752 | 252 | static void* |
b53cb2a4 | 253 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) |
0896b752 AA |
254 | { |
255 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 256 | |
0896b752 | 257 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
258 | } |
259 | ||
0896b752 AA |
260 | static void |
261 | mempool_zone_free_skb(void *element, void *pool_data) | |
262 | { | |
263 | kfree_skb(element); | |
264 | } | |
1da177e4 | 265 | |
0896b752 AA |
266 | static void |
267 | mempool_zone_complete(struct mempool_zone *zone) | |
268 | { | |
269 | unsigned long flags; | |
270 | struct list_head *lh, *n; | |
1da177e4 | 271 | |
0896b752 AA |
272 | spin_lock_irqsave(&zone->freelock, flags); |
273 | list_for_each_safe(lh, n, &zone->freequeue) { | |
274 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
275 | offsetof(struct sk_buff, cb)); | |
276 | if (!skb_shared(skb)) { | |
277 | list_del(skb_to_lh(skb)); | |
278 | mempool_free(skb, zone->pool); | |
279 | atomic_dec(&zone->allocated); | |
280 | } | |
281 | } | |
282 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
283 | } |
284 | ||
0896b752 AA |
285 | static int |
286 | mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size, | |
287 | unsigned hiwat) | |
288 | { | |
289 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, | |
290 | mempool_zone_free_skb, zp); | |
291 | if (!zp->pool) | |
292 | return -ENOMEM; | |
1da177e4 | 293 | |
0896b752 AA |
294 | zp->size = size; |
295 | zp->hiwat = hiwat; | |
1da177e4 | 296 | |
0896b752 AA |
297 | INIT_LIST_HEAD(&zp->freequeue); |
298 | spin_lock_init(&zp->freelock); | |
299 | atomic_set(&zp->allocated, 0); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | ||
305 | static struct sk_buff* | |
306 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 307 | { |
0896b752 AA |
308 | struct sk_buff *skb; |
309 | ||
310 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
311 | if (skb) | |
312 | atomic_inc(&zone->allocated); | |
313 | return skb; | |
314 | } | |
1da177e4 | 315 | |
0896b752 AA |
316 | static int |
317 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
318 | { | |
319 | unsigned long flags; | |
320 | int rc; | |
1da177e4 | 321 | |
0896b752 AA |
322 | skb_get(skb); |
323 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
324 | if (rc < 0) { | |
325 | mempool_free(skb, zone->pool); | |
326 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
327 | return rc; | |
328 | } | |
329 | ||
330 | spin_lock_irqsave(&zone->freelock, flags); | |
331 | list_add(skb_to_lh(skb), &zone->freequeue); | |
332 | spin_unlock_irqrestore(&zone->freelock, flags); | |
333 | ||
334 | return 0; | |
1da177e4 | 335 | } |
1da177e4 | 336 | |
0896b752 AA |
337 | int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, |
338 | char *data, uint32_t data_size) | |
1da177e4 | 339 | { |
0896b752 AA |
340 | struct nlmsghdr *nlh; |
341 | struct sk_buff *skb; | |
342 | struct iscsi_uevent *ev; | |
343 | struct iscsi_if_conn *conn; | |
344 | char *pdu; | |
345 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
346 | data_size); | |
347 | ||
348 | conn = iscsi_if_find_conn(connh); | |
349 | BUG_ON(!conn); | |
350 | ||
351 | mempool_zone_complete(&conn->z_pdu); | |
352 | ||
353 | skb = mempool_zone_get_skb(&conn->z_pdu); | |
354 | if (!skb) { | |
355 | iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED); | |
356 | printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n", | |
357 | conn->host->host_no); | |
358 | return -ENOMEM; | |
359 | } | |
1da177e4 | 360 | |
0896b752 AA |
361 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
362 | ev = NLMSG_DATA(nlh); | |
363 | memset(ev, 0, sizeof(*ev)); | |
364 | ev->transport_handle = iscsi_handle(conn->transport); | |
365 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
366 | if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat) | |
367 | ev->iferror = -ENOMEM; | |
368 | ev->r.recv_req.conn_handle = connh; | |
369 | pdu = (char*)ev + sizeof(*ev); | |
370 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
371 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 372 | |
0896b752 | 373 | return iscsi_unicast_skb(&conn->z_pdu, skb); |
1da177e4 | 374 | } |
0896b752 | 375 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 376 | |
0896b752 | 377 | void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error) |
1da177e4 | 378 | { |
0896b752 AA |
379 | struct nlmsghdr *nlh; |
380 | struct sk_buff *skb; | |
381 | struct iscsi_uevent *ev; | |
382 | struct iscsi_if_conn *conn; | |
383 | int len = NLMSG_SPACE(sizeof(*ev)); | |
384 | ||
385 | conn = iscsi_if_find_conn(connh); | |
386 | BUG_ON(!conn); | |
387 | ||
388 | mempool_zone_complete(&conn->z_error); | |
389 | ||
390 | skb = mempool_zone_get_skb(&conn->z_error); | |
391 | if (!skb) { | |
392 | printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n", | |
393 | conn->host->host_no, error); | |
394 | return; | |
395 | } | |
396 | ||
397 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
398 | ev = NLMSG_DATA(nlh); | |
399 | ev->transport_handle = iscsi_handle(conn->transport); | |
400 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
401 | if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat) | |
402 | ev->iferror = -ENOMEM; | |
403 | ev->r.connerror.error = error; | |
404 | ev->r.connerror.conn_handle = connh; | |
1da177e4 | 405 | |
0896b752 | 406 | iscsi_unicast_skb(&conn->z_error, skb); |
1da177e4 | 407 | |
0896b752 AA |
408 | printk(KERN_INFO "iscsi%d: detected conn error (%d)\n", |
409 | conn->host->host_no, error); | |
410 | } | |
411 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
412 | ||
413 | static int | |
414 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
415 | void *payload, int size) | |
416 | { | |
417 | struct sk_buff *skb; | |
418 | struct nlmsghdr *nlh; | |
419 | int len = NLMSG_SPACE(size); | |
420 | int flags = multi ? NLM_F_MULTI : 0; | |
421 | int t = done ? NLMSG_DONE : type; | |
422 | ||
423 | mempool_zone_complete(&z_reply); | |
424 | ||
425 | skb = mempool_zone_get_skb(&z_reply); | |
426 | /* | |
427 | * FIXME: | |
428 | * user is supposed to react on iferror == -ENOMEM; | |
429 | * see iscsi_if_rx(). | |
430 | */ | |
431 | BUG_ON(!skb); | |
432 | ||
433 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
434 | nlh->nlmsg_flags = flags; | |
435 | memcpy(NLMSG_DATA(nlh), payload, size); | |
436 | return iscsi_unicast_skb(&z_reply, skb); | |
1da177e4 | 437 | } |
1da177e4 LT |
438 | |
439 | /* | |
0896b752 AA |
440 | * iSCSI Session's hostdata organization: |
441 | * | |
442 | * *------------------* <== host->hostdata | |
443 | * | transport | | |
444 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
445 | * | transport's data | | |
446 | * |------------------| <== hostdata_session(host->hostdata) | |
447 | * | interface's data | | |
448 | * *------------------* | |
1da177e4 | 449 | */ |
0896b752 AA |
450 | |
451 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
452 | _t->hostdata_size % sizeof(unsigned long) + \ | |
453 | sizeof(struct iscsi_if_session)) | |
454 | ||
455 | #define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \ | |
456 | ((struct iscsi_transport *) \ | |
457 | iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size) | |
458 | ||
459 | static void iscsi_if_session_dev_release(struct device *dev) | |
460 | { | |
461 | struct iscsi_if_session *session = iscsi_dev_to_if_session(dev); | |
462 | struct iscsi_transport *transport = session->transport; | |
463 | struct Scsi_Host *shost = iscsi_if_session_to_shost(session); | |
464 | struct iscsi_if_conn *conn, *tmp; | |
465 | unsigned long flags; | |
466 | ||
467 | /* now free connections */ | |
468 | spin_lock_irqsave(&connlock, flags); | |
469 | list_for_each_entry_safe(conn, tmp, &session->connections, | |
470 | session_list) { | |
471 | list_del(&conn->session_list); | |
472 | mempool_destroy(conn->z_pdu.pool); | |
473 | mempool_destroy(conn->z_error.pool); | |
474 | kfree(conn); | |
475 | } | |
476 | spin_unlock_irqrestore(&connlock, flags); | |
477 | scsi_host_put(shost); | |
478 | module_put(transport->owner); | |
479 | } | |
480 | ||
481 | static int | |
482 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
483 | { | |
484 | struct iscsi_transport *transport = priv->iscsi_transport; | |
485 | struct iscsi_if_session *session; | |
486 | struct Scsi_Host *shost; | |
487 | unsigned long flags; | |
488 | int error; | |
489 | ||
490 | if (!try_module_get(transport->owner)) | |
491 | return -EPERM; | |
492 | ||
493 | shost = scsi_host_alloc(transport->host_template, | |
494 | hostdata_privsize(transport)); | |
495 | if (!shost) { | |
496 | ev->r.c_session_ret.session_handle = iscsi_handle(NULL); | |
497 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
498 | "session\n"); | |
499 | error = -ENOMEM; | |
500 | goto out_module_put; | |
501 | } | |
502 | shost->max_id = 1; | |
503 | shost->max_channel = 0; | |
504 | shost->max_lun = transport->max_lun; | |
505 | shost->max_cmd_len = transport->max_cmd_len; | |
506 | shost->transportt = &priv->t; | |
507 | ||
508 | /* store struct iscsi_transport in hostdata */ | |
509 | *(uint64_t*)shost->hostdata = ev->transport_handle; | |
510 | ||
511 | ev->r.c_session_ret.session_handle = transport->create_session( | |
512 | ev->u.c_session.initial_cmdsn, shost); | |
513 | if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) { | |
514 | error = 0; | |
515 | goto out_host_put; | |
516 | } | |
517 | ||
518 | /* host_no becomes assigned SID */ | |
519 | ev->r.c_session_ret.sid = shost->host_no; | |
520 | /* initialize session */ | |
521 | session = hostdata_session(shost->hostdata); | |
522 | INIT_LIST_HEAD(&session->connections); | |
523 | INIT_LIST_HEAD(&session->list); | |
524 | session->sessionh = ev->r.c_session_ret.session_handle; | |
525 | session->transport = transport; | |
526 | ||
527 | error = scsi_add_host(shost, NULL); | |
528 | if (error) | |
529 | goto out_destroy_session; | |
530 | ||
531 | /* | |
532 | * this is released in the dev's release function) | |
533 | */ | |
534 | scsi_host_get(shost); | |
535 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); | |
536 | session->dev.parent = &shost->shost_gendev; | |
537 | session->dev.release = iscsi_if_session_dev_release; | |
538 | error = device_register(&session->dev); | |
539 | if (error) { | |
540 | printk(KERN_ERR "iscsi: could not register session%d's dev\n", | |
541 | shost->host_no); | |
542 | goto out_remove_host; | |
543 | } | |
544 | transport_register_device(&session->dev); | |
545 | ||
546 | /* add this session to the list of active sessions */ | |
547 | spin_lock_irqsave(&priv->session_lock, flags); | |
548 | list_add(&session->list, &priv->sessions); | |
549 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
550 | ||
551 | return 0; | |
552 | ||
553 | out_remove_host: | |
554 | scsi_remove_host(shost); | |
555 | out_destroy_session: | |
556 | transport->destroy_session(ev->r.c_session_ret.session_handle); | |
557 | ev->r.c_session_ret.session_handle = iscsi_handle(NULL); | |
558 | out_host_put: | |
559 | scsi_host_put(shost); | |
560 | out_module_put: | |
561 | module_put(transport->owner); | |
562 | return error; | |
563 | } | |
564 | ||
565 | static int | |
566 | iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
567 | { | |
568 | struct iscsi_transport *transport = priv->iscsi_transport; | |
569 | struct Scsi_Host *shost; | |
570 | struct iscsi_if_session *session; | |
571 | unsigned long flags; | |
572 | struct iscsi_if_conn *conn; | |
573 | int error = 0; | |
574 | ||
575 | shost = scsi_host_lookup(ev->u.d_session.sid); | |
576 | if (shost == ERR_PTR(-ENXIO)) | |
577 | return -EEXIST; | |
578 | session = hostdata_session(shost->hostdata); | |
579 | ||
580 | /* check if we have active connections */ | |
581 | spin_lock_irqsave(&connlock, flags); | |
582 | list_for_each_entry(conn, &session->connections, session_list) { | |
583 | if (conn->active) { | |
584 | printk(KERN_ERR "iscsi%d: can not destroy session: " | |
585 | "has active connection (%p)\n", | |
586 | shost->host_no, iscsi_ptr(conn->connh)); | |
587 | spin_unlock_irqrestore(&connlock, flags); | |
588 | error = EIO; | |
589 | goto out_release_ref; | |
590 | } | |
591 | } | |
592 | spin_unlock_irqrestore(&connlock, flags); | |
593 | ||
594 | scsi_remove_host(shost); | |
595 | transport->destroy_session(ev->u.d_session.session_handle); | |
596 | transport_unregister_device(&session->dev); | |
597 | device_unregister(&session->dev); | |
598 | ||
599 | /* remove this session from the list of active sessions */ | |
600 | spin_lock_irqsave(&priv->session_lock, flags); | |
601 | list_del(&session->list); | |
602 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
603 | ||
604 | /* ref from host alloc */ | |
605 | scsi_host_put(shost); | |
606 | out_release_ref: | |
607 | /* ref from host lookup */ | |
608 | scsi_host_put(shost); | |
609 | return error; | |
610 | } | |
611 | ||
612 | static void iscsi_if_conn_dev_release(struct device *dev) | |
613 | { | |
614 | struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev); | |
615 | struct Scsi_Host *shost = conn->host; | |
616 | ||
617 | scsi_host_put(shost); | |
618 | } | |
619 | ||
620 | static int | |
621 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
622 | { | |
623 | struct iscsi_if_session *session; | |
624 | struct Scsi_Host *shost; | |
625 | struct iscsi_if_conn *conn; | |
626 | unsigned long flags; | |
627 | int error; | |
628 | ||
629 | shost = scsi_host_lookup(ev->u.c_conn.sid); | |
630 | if (shost == ERR_PTR(-ENXIO)) | |
631 | return -EEXIST; | |
632 | session = hostdata_session(shost->hostdata); | |
633 | ||
634 | conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL); | |
635 | if (!conn) { | |
636 | error = -ENOMEM; | |
637 | goto out_release_ref; | |
638 | } | |
639 | memset(conn, 0, sizeof(struct iscsi_if_conn)); | |
640 | INIT_LIST_HEAD(&conn->session_list); | |
641 | INIT_LIST_HEAD(&conn->conn_list); | |
642 | conn->host = shost; | |
643 | conn->transport = transport; | |
644 | ||
645 | error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU, | |
646 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
647 | sizeof(struct iscsi_hdr) + | |
648 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
649 | Z_HIWAT_PDU); | |
650 | if (error) { | |
651 | printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new " | |
652 | "conn\n", shost->host_no); | |
653 | goto out_free_conn; | |
654 | } | |
655 | error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR, | |
656 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), | |
657 | Z_HIWAT_ERROR); | |
658 | if (error) { | |
659 | printk(KERN_ERR "iscsi%d: can not allocate error zone for " | |
660 | "new conn\n", shost->host_no); | |
661 | goto out_free_pdu_pool; | |
662 | } | |
663 | ||
664 | ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle, | |
665 | ev->u.c_conn.cid); | |
666 | if (!ev->r.handle) { | |
667 | error = -ENODEV; | |
668 | goto out_free_error_pool; | |
669 | } | |
670 | ||
671 | conn->connh = ev->r.handle; | |
672 | ||
673 | /* | |
674 | * this is released in the dev's release function | |
675 | */ | |
676 | if (!scsi_host_get(shost)) | |
677 | goto out_destroy_conn; | |
678 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", | |
679 | shost->host_no, ev->u.c_conn.cid); | |
680 | conn->dev.parent = &session->dev; | |
681 | conn->dev.release = iscsi_if_conn_dev_release; | |
682 | error = device_register(&conn->dev); | |
683 | if (error) { | |
684 | printk(KERN_ERR "iscsi%d: could not register connections%u " | |
685 | "dev\n", shost->host_no, ev->u.c_conn.cid); | |
686 | goto out_release_parent_ref; | |
687 | } | |
688 | transport_register_device(&conn->dev); | |
689 | ||
690 | spin_lock_irqsave(&connlock, flags); | |
691 | list_add(&conn->conn_list, &connlist); | |
692 | list_add(&conn->session_list, &session->connections); | |
693 | conn->active = 1; | |
694 | spin_unlock_irqrestore(&connlock, flags); | |
695 | ||
696 | scsi_host_put(shost); | |
697 | return 0; | |
698 | ||
699 | out_release_parent_ref: | |
700 | scsi_host_put(shost); | |
701 | out_destroy_conn: | |
702 | transport->destroy_conn(ev->r.handle); | |
703 | out_free_error_pool: | |
704 | mempool_destroy(conn->z_error.pool); | |
705 | out_free_pdu_pool: | |
706 | mempool_destroy(conn->z_pdu.pool); | |
707 | out_free_conn: | |
708 | kfree(conn); | |
709 | out_release_ref: | |
710 | scsi_host_put(shost); | |
711 | return error; | |
1da177e4 LT |
712 | } |
713 | ||
0896b752 AA |
714 | static int |
715 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
716 | { | |
717 | unsigned long flags; | |
718 | struct iscsi_if_conn *conn; | |
719 | ||
720 | conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle); | |
721 | if (!conn) | |
722 | return -EEXIST; | |
723 | ||
724 | transport->destroy_conn(ev->u.d_conn.conn_handle); | |
725 | ||
726 | spin_lock_irqsave(&connlock, flags); | |
727 | conn->active = 0; | |
728 | list_del(&conn->conn_list); | |
729 | spin_unlock_irqrestore(&connlock, flags); | |
730 | ||
731 | transport_unregister_device(&conn->dev); | |
732 | device_unregister(&conn->dev); | |
733 | return 0; | |
734 | } | |
735 | ||
736 | static int | |
737 | iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb, | |
738 | struct nlmsghdr *nlh) | |
739 | { | |
740 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
741 | struct iscsi_stats *stats; | |
742 | struct sk_buff *skbstat; | |
743 | struct iscsi_if_conn *conn; | |
744 | struct nlmsghdr *nlhstat; | |
745 | struct iscsi_uevent *evstat; | |
746 | int len = NLMSG_SPACE(sizeof(*ev) + | |
747 | sizeof(struct iscsi_stats) + | |
748 | sizeof(struct iscsi_stats_custom) * | |
749 | ISCSI_STATS_CUSTOM_MAX); | |
750 | int err = 0; | |
751 | ||
752 | conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle); | |
753 | if (!conn) | |
754 | return -EEXIST; | |
755 | ||
756 | do { | |
757 | int actual_size; | |
758 | ||
759 | mempool_zone_complete(&conn->z_pdu); | |
760 | ||
761 | skbstat = mempool_zone_get_skb(&conn->z_pdu); | |
762 | if (!skbstat) { | |
763 | printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n", | |
764 | conn->host->host_no); | |
765 | return -ENOMEM; | |
766 | } | |
767 | ||
768 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
769 | (len - sizeof(*nlhstat)), 0); | |
770 | evstat = NLMSG_DATA(nlhstat); | |
771 | memset(evstat, 0, sizeof(*evstat)); | |
772 | evstat->transport_handle = iscsi_handle(conn->transport); | |
773 | evstat->type = nlh->nlmsg_type; | |
774 | if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat) | |
775 | evstat->iferror = -ENOMEM; | |
776 | evstat->u.get_stats.conn_handle = | |
777 | ev->u.get_stats.conn_handle; | |
778 | stats = (struct iscsi_stats *) | |
779 | ((char*)evstat + sizeof(*evstat)); | |
780 | memset(stats, 0, sizeof(*stats)); | |
781 | ||
782 | transport->get_stats(ev->u.get_stats.conn_handle, stats); | |
783 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
784 | sizeof(struct iscsi_stats) + | |
785 | sizeof(struct iscsi_stats_custom) * | |
786 | stats->custom_length); | |
787 | actual_size -= sizeof(*nlhstat); | |
788 | actual_size = NLMSG_LENGTH(actual_size); | |
789 | skb_trim(skb, NLMSG_ALIGN(actual_size)); | |
790 | nlhstat->nlmsg_len = actual_size; | |
791 | ||
792 | err = iscsi_unicast_skb(&conn->z_pdu, skbstat); | |
793 | } while (err < 0 && err != -ECONNREFUSED); | |
794 | ||
795 | return err; | |
796 | } | |
797 | ||
798 | static int | |
799 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
800 | { | |
801 | int err = 0; | |
802 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
803 | struct iscsi_transport *transport = NULL; | |
804 | struct iscsi_internal *priv; | |
805 | ||
806 | if (NETLINK_CREDS(skb)->uid) | |
807 | return -EPERM; | |
808 | ||
809 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); | |
810 | if (!priv) | |
811 | return -EINVAL; | |
812 | transport = priv->iscsi_transport; | |
813 | ||
814 | daemon_pid = NETLINK_CREDS(skb)->pid; | |
815 | ||
816 | switch (nlh->nlmsg_type) { | |
817 | case ISCSI_UEVENT_CREATE_SESSION: | |
818 | err = iscsi_if_create_session(priv, ev); | |
819 | break; | |
820 | case ISCSI_UEVENT_DESTROY_SESSION: | |
821 | err = iscsi_if_destroy_session(priv, ev); | |
822 | break; | |
823 | case ISCSI_UEVENT_CREATE_CONN: | |
824 | err = iscsi_if_create_conn(transport, ev); | |
825 | break; | |
826 | case ISCSI_UEVENT_DESTROY_CONN: | |
827 | err = iscsi_if_destroy_conn(transport, ev); | |
828 | break; | |
829 | case ISCSI_UEVENT_BIND_CONN: | |
830 | if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle)) | |
831 | return -EEXIST; | |
832 | ev->r.retcode = transport->bind_conn( | |
833 | ev->u.b_conn.session_handle, | |
834 | ev->u.b_conn.conn_handle, | |
835 | ev->u.b_conn.transport_fd, | |
836 | ev->u.b_conn.is_leading); | |
837 | break; | |
838 | case ISCSI_UEVENT_SET_PARAM: | |
839 | if (!iscsi_if_find_conn(ev->u.set_param.conn_handle)) | |
840 | return -EEXIST; | |
841 | ev->r.retcode = transport->set_param( | |
842 | ev->u.set_param.conn_handle, | |
843 | ev->u.set_param.param, ev->u.set_param.value); | |
844 | break; | |
845 | case ISCSI_UEVENT_START_CONN: | |
846 | if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle)) | |
847 | return -EEXIST; | |
848 | ev->r.retcode = transport->start_conn( | |
849 | ev->u.start_conn.conn_handle); | |
850 | break; | |
851 | case ISCSI_UEVENT_STOP_CONN: | |
852 | if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle)) | |
853 | return -EEXIST; | |
854 | transport->stop_conn(ev->u.stop_conn.conn_handle, | |
855 | ev->u.stop_conn.flag); | |
856 | break; | |
857 | case ISCSI_UEVENT_SEND_PDU: | |
858 | if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle)) | |
859 | return -EEXIST; | |
860 | ev->r.retcode = transport->send_pdu( | |
861 | ev->u.send_pdu.conn_handle, | |
862 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
863 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
864 | ev->u.send_pdu.data_size); | |
865 | break; | |
866 | case ISCSI_UEVENT_GET_STATS: | |
867 | err = iscsi_if_get_stats(transport, skb, nlh); | |
868 | break; | |
869 | default: | |
870 | err = -EINVAL; | |
871 | break; | |
872 | } | |
873 | ||
874 | return err; | |
875 | } | |
876 | ||
877 | /* Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
878 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are | |
879 | * discarded silently. */ | |
880 | static void | |
881 | iscsi_if_rx(struct sock *sk, int len) | |
882 | { | |
883 | struct sk_buff *skb; | |
1da177e4 | 884 | |
0b950672 | 885 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
886 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
887 | while (skb->len >= NLMSG_SPACE(0)) { | |
888 | int err; | |
889 | uint32_t rlen; | |
890 | struct nlmsghdr *nlh; | |
891 | struct iscsi_uevent *ev; | |
892 | ||
893 | nlh = (struct nlmsghdr *)skb->data; | |
894 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
895 | skb->len < nlh->nlmsg_len) { | |
896 | break; | |
897 | } | |
898 | ev = NLMSG_DATA(nlh); | |
899 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
900 | if (rlen > skb->len) | |
901 | rlen = skb->len; | |
902 | err = iscsi_if_recv_msg(skb, nlh); | |
903 | if (err) { | |
904 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
905 | ev->iferror = err; | |
906 | } | |
907 | do { | |
908 | /* | |
909 | * special case for GET_STATS: | |
910 | * on success - sending reply and stats from | |
911 | * inside of if_recv_msg(), | |
912 | * on error - fall through. | |
913 | */ | |
914 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
915 | break; | |
916 | err = iscsi_if_send_reply( | |
917 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
918 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
919 | if (atomic_read(&z_reply.allocated) >= | |
920 | z_reply.hiwat) | |
921 | ev->iferror = -ENOMEM; | |
922 | } while (err < 0 && err != -ECONNREFUSED); | |
923 | skb_pull(skb, rlen); | |
924 | } | |
925 | kfree_skb(skb); | |
926 | } | |
0b950672 | 927 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 928 | } |
1da177e4 LT |
929 | |
930 | /* | |
0896b752 | 931 | * iSCSI connection attrs |
1da177e4 | 932 | */ |
0896b752 AA |
933 | #define iscsi_conn_int_attr_show(param, format) \ |
934 | static ssize_t \ | |
935 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
936 | { \ | |
937 | uint32_t value = 0; \ | |
938 | struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \ | |
939 | struct iscsi_internal *priv; \ | |
940 | \ | |
941 | priv = to_iscsi_internal(conn->host->transportt); \ | |
942 | if (priv->param_mask & (1 << param)) \ | |
943 | priv->iscsi_transport->get_param(conn->connh, param, &value); \ | |
944 | return snprintf(buf, 20, format"\n", value); \ | |
945 | } | |
946 | ||
947 | #define iscsi_conn_int_attr(field, param, format) \ | |
948 | iscsi_conn_int_attr_show(param, format) \ | |
949 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); | |
950 | ||
951 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
952 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
953 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
954 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
955 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
956 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
1da177e4 LT |
957 | |
958 | /* | |
0896b752 | 959 | * iSCSI session attrs |
1da177e4 | 960 | */ |
0896b752 | 961 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 962 | static ssize_t \ |
0896b752 | 963 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 964 | { \ |
0896b752 AA |
965 | uint32_t value = 0; \ |
966 | struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \ | |
967 | struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \ | |
968 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ | |
969 | struct iscsi_if_conn *conn = NULL; \ | |
970 | unsigned long flags; \ | |
971 | \ | |
972 | spin_lock_irqsave(&connlock, flags); \ | |
973 | if (!list_empty(&session->connections)) \ | |
974 | conn = list_entry(session->connections.next, \ | |
975 | struct iscsi_if_conn, session_list); \ | |
976 | spin_unlock_irqrestore(&connlock, flags); \ | |
1da177e4 | 977 | \ |
0896b752 AA |
978 | if (conn && (priv->param_mask & (1 << param))) \ |
979 | priv->iscsi_transport->get_param(conn->connh, param, &value);\ | |
980 | return snprintf(buf, 20, format"\n", value); \ | |
1da177e4 LT |
981 | } |
982 | ||
0896b752 AA |
983 | #define iscsi_session_int_attr(field, param, format) \ |
984 | iscsi_session_int_attr_show(param, format) \ | |
985 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); | |
1da177e4 | 986 | |
0896b752 AA |
987 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
988 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
989 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
990 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
991 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
992 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
993 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
994 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
1da177e4 | 995 | |
0896b752 AA |
996 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
997 | if (priv->param_mask & (1 << param)) { \ | |
998 | priv->session_attrs[count] = &class_device_attr_##field;\ | |
1da177e4 LT |
999 | count++; \ |
1000 | } | |
1001 | ||
0896b752 AA |
1002 | #define SETUP_CONN_RD_ATTR(field, param) \ |
1003 | if (priv->param_mask & (1 << param)) { \ | |
1004 | priv->conn_attrs[count] = &class_device_attr_##field; \ | |
1da177e4 LT |
1005 | count++; \ |
1006 | } | |
1007 | ||
0896b752 AA |
1008 | static int iscsi_is_session_dev(const struct device *dev) |
1009 | { | |
1010 | return dev->release == iscsi_if_session_dev_release; | |
1011 | } | |
1012 | ||
1013 | static int iscsi_session_match(struct attribute_container *cont, | |
1014 | struct device *dev) | |
1da177e4 | 1015 | { |
0896b752 | 1016 | struct iscsi_if_session *session; |
1da177e4 | 1017 | struct Scsi_Host *shost; |
0896b752 AA |
1018 | struct iscsi_internal *priv; |
1019 | ||
1020 | if (!iscsi_is_session_dev(dev)) | |
1021 | return 0; | |
1da177e4 | 1022 | |
0896b752 AA |
1023 | session = iscsi_dev_to_if_session(dev); |
1024 | shost = iscsi_if_session_to_shost(session); | |
1025 | if (!shost->transportt) | |
1da177e4 LT |
1026 | return 0; |
1027 | ||
0896b752 AA |
1028 | priv = to_iscsi_internal(shost->transportt); |
1029 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1030 | return 0; |
1031 | ||
0896b752 | 1032 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1033 | } |
1034 | ||
0896b752 | 1035 | static int iscsi_is_conn_dev(const struct device *dev) |
1da177e4 | 1036 | { |
0896b752 AA |
1037 | return dev->release == iscsi_if_conn_dev_release; |
1038 | } | |
1039 | ||
1040 | static int iscsi_conn_match(struct attribute_container *cont, | |
1041 | struct device *dev) | |
1042 | { | |
1043 | struct iscsi_if_conn *conn; | |
1da177e4 | 1044 | struct Scsi_Host *shost; |
0896b752 | 1045 | struct iscsi_internal *priv; |
1da177e4 | 1046 | |
0896b752 | 1047 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1048 | return 0; |
1049 | ||
0896b752 AA |
1050 | conn = iscsi_dev_to_if_conn(dev); |
1051 | shost = conn->host; | |
1052 | if (!shost->transportt) | |
1da177e4 LT |
1053 | return 0; |
1054 | ||
0896b752 AA |
1055 | priv = to_iscsi_internal(shost->transportt); |
1056 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1057 | return 0; | |
1da177e4 | 1058 | |
0896b752 AA |
1059 | return &priv->conn_cont.ac == cont; |
1060 | } | |
1061 | ||
1062 | int iscsi_register_transport(struct iscsi_transport *tt) | |
1063 | { | |
1064 | struct iscsi_internal *priv; | |
1065 | unsigned long flags; | |
1066 | int count = 0, err; | |
1067 | ||
1068 | BUG_ON(!tt); | |
1069 | ||
1070 | priv = iscsi_if_transport_lookup(tt); | |
1071 | if (priv) | |
1072 | return -EEXIST; | |
1073 | ||
1074 | priv = kmalloc(sizeof(*priv), GFP_KERNEL); | |
1075 | if (!priv) | |
1076 | return -ENOMEM; | |
1077 | memset(priv, 0, sizeof(*priv)); | |
1078 | INIT_LIST_HEAD(&priv->list); | |
1079 | INIT_LIST_HEAD(&priv->sessions); | |
1080 | spin_lock_init(&priv->session_lock); | |
1081 | priv->iscsi_transport = tt; | |
1082 | ||
1083 | priv->cdev.class = &iscsi_transport_class; | |
1084 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1085 | err = class_device_register(&priv->cdev); | |
1086 | if (err) | |
1087 | goto free_priv; | |
1088 | ||
1089 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1090 | if (err) | |
1091 | goto unregister_cdev; | |
1092 | ||
1093 | /* setup parameters mask */ | |
1094 | priv->param_mask = 0xFFFFFFFF; | |
1095 | if (!(tt->caps & CAP_MULTI_R2T)) | |
1096 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); | |
1097 | if (!(tt->caps & CAP_HDRDGST)) | |
1098 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); | |
1099 | if (!(tt->caps & CAP_DATADGST)) | |
1100 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); | |
1101 | if (!(tt->caps & CAP_MARKERS)) { | |
1102 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); | |
1103 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); | |
1104 | } | |
1da177e4 | 1105 | |
0896b752 AA |
1106 | /* connection parameters */ |
1107 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1108 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1109 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1110 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1111 | |
0896b752 AA |
1112 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1113 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1114 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1115 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1116 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1117 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1118 | ||
1119 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1120 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1121 | count = 0; |
1da177e4 | 1122 | |
0896b752 AA |
1123 | /* session parameters */ |
1124 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1125 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1126 | priv->session_cont.ac.match = iscsi_session_match; | |
1127 | transport_container_register(&priv->session_cont); | |
1128 | ||
1129 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1130 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1131 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1132 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1133 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1134 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1135 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) | |
1136 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); | |
1137 | ||
1138 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1139 | priv->session_attrs[count] = NULL; | |
1140 | ||
1141 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1142 | list_add(&priv->list, &iscsi_transports); | |
1143 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1144 | ||
1145 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
1146 | return 0; | |
1da177e4 | 1147 | |
0896b752 AA |
1148 | unregister_cdev: |
1149 | class_device_unregister(&priv->cdev); | |
1150 | free_priv: | |
1151 | kfree(priv); | |
1152 | return err; | |
1da177e4 | 1153 | } |
0896b752 AA |
1154 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1155 | ||
1156 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1157 | { | |
1158 | struct iscsi_internal *priv; | |
1159 | unsigned long flags; | |
1160 | ||
1161 | BUG_ON(!tt); | |
1162 | ||
0b950672 | 1163 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1164 | |
1165 | priv = iscsi_if_transport_lookup(tt); | |
1166 | BUG_ON (!priv); | |
1167 | ||
1168 | spin_lock_irqsave(&priv->session_lock, flags); | |
1169 | if (!list_empty(&priv->sessions)) { | |
1170 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
0b950672 | 1171 | mutex_unlock(&rx_queue_mutex); |
0896b752 AA |
1172 | return -EPERM; |
1173 | } | |
1174 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
1175 | ||
1176 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1177 | list_del(&priv->list); | |
1178 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1179 | ||
1180 | transport_container_unregister(&priv->conn_cont); | |
1181 | transport_container_unregister(&priv->session_cont); | |
1182 | ||
1183 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1184 | class_device_unregister(&priv->cdev); | |
0b950672 | 1185 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1186 | |
0896b752 AA |
1187 | return 0; |
1188 | } | |
1189 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1190 | |
0896b752 AA |
1191 | static int |
1192 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1193 | { |
0896b752 AA |
1194 | struct netlink_notify *n = ptr; |
1195 | ||
1196 | if (event == NETLINK_URELEASE && | |
1197 | n->protocol == NETLINK_ISCSI && n->pid) { | |
1198 | struct iscsi_if_conn *conn; | |
1199 | unsigned long flags; | |
1200 | ||
1201 | mempool_zone_complete(&z_reply); | |
1202 | spin_lock_irqsave(&connlock, flags); | |
1203 | list_for_each_entry(conn, &connlist, conn_list) { | |
1204 | mempool_zone_complete(&conn->z_error); | |
1205 | mempool_zone_complete(&conn->z_pdu); | |
1206 | } | |
1207 | spin_unlock_irqrestore(&connlock, flags); | |
1208 | } | |
1da177e4 | 1209 | |
0896b752 | 1210 | return NOTIFY_DONE; |
1da177e4 LT |
1211 | } |
1212 | ||
0896b752 AA |
1213 | static struct notifier_block iscsi_nl_notifier = { |
1214 | .notifier_call = iscsi_rcv_nl_event, | |
1215 | }; | |
1da177e4 LT |
1216 | |
1217 | static __init int iscsi_transport_init(void) | |
1218 | { | |
0896b752 | 1219 | int err; |
1da177e4 | 1220 | |
0896b752 | 1221 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1222 | if (err) |
1223 | return err; | |
0896b752 AA |
1224 | |
1225 | err = transport_class_register(&iscsi_connection_class); | |
1226 | if (err) | |
1227 | goto unregister_transport_class; | |
1228 | ||
1229 | err = transport_class_register(&iscsi_session_class); | |
1230 | if (err) | |
1231 | goto unregister_conn_class; | |
1232 | ||
1233 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1234 | if (err) | |
1235 | goto unregister_session_class; | |
1236 | ||
2290d2b6 JB |
1237 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
1238 | THIS_MODULE); | |
0896b752 AA |
1239 | if (!nls) { |
1240 | err = -ENOBUFS; | |
1241 | goto unregister_notifier; | |
1242 | } | |
1243 | ||
1244 | err = mempool_zone_init(&z_reply, Z_MAX_REPLY, | |
1245 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); | |
1246 | if (!err) | |
1247 | return 0; | |
1248 | ||
1249 | sock_release(nls->sk_socket); | |
1250 | unregister_notifier: | |
1251 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1252 | unregister_session_class: | |
1253 | transport_class_unregister(&iscsi_session_class); | |
1254 | unregister_conn_class: | |
1255 | transport_class_unregister(&iscsi_connection_class); | |
1256 | unregister_transport_class: | |
1257 | class_unregister(&iscsi_transport_class); | |
1258 | return err; | |
1da177e4 LT |
1259 | } |
1260 | ||
1261 | static void __exit iscsi_transport_exit(void) | |
1262 | { | |
0896b752 AA |
1263 | mempool_destroy(z_reply.pool); |
1264 | sock_release(nls->sk_socket); | |
1265 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1266 | transport_class_unregister(&iscsi_connection_class); | |
1267 | transport_class_unregister(&iscsi_session_class); | |
1268 | class_unregister(&iscsi_transport_class); | |
1da177e4 LT |
1269 | } |
1270 | ||
1271 | module_init(iscsi_transport_init); | |
1272 | module_exit(iscsi_transport_exit); | |
1273 | ||
0896b752 AA |
1274 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1275 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1276 | "Alex Aizman <itn780@yahoo.com>"); | |
1277 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1278 | MODULE_LICENSE("GPL"); |