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 AA |
24 | #include <linux/mempool.h> |
25 | #include <net/tcp.h> | |
1da177e4 LT |
26 | #include <scsi/scsi.h> |
27 | #include <scsi/scsi_host.h> | |
28 | #include <scsi/scsi_device.h> | |
29 | #include <scsi/scsi_transport.h> | |
30 | #include <scsi/scsi_transport_iscsi.h> | |
0896b752 | 31 | #include <scsi/iscsi_if.h> |
1da177e4 | 32 | |
0896b752 AA |
33 | #define ISCSI_SESSION_ATTRS 8 |
34 | #define ISCSI_CONN_ATTRS 6 | |
1da177e4 LT |
35 | |
36 | struct iscsi_internal { | |
37 | struct scsi_transport_template t; | |
0896b752 AA |
38 | struct iscsi_transport *iscsi_transport; |
39 | struct list_head list; | |
40 | /* | |
41 | * List of sessions for this transport | |
42 | */ | |
43 | struct list_head sessions; | |
44 | /* | |
45 | * lock to serialize access to the sessions list which must | |
46 | * be taken after the rx_queue_sema | |
47 | */ | |
48 | spinlock_t session_lock; | |
49 | /* | |
50 | * based on transport capabilities, at register time we set these | |
51 | * bits to tell the transport class it wants attributes displayed | |
52 | * in sysfs or that it can support different iSCSI Data-Path | |
53 | * capabilities | |
54 | */ | |
55 | uint32_t param_mask; | |
56 | ||
57 | struct class_device cdev; | |
1da177e4 LT |
58 | /* |
59 | * We do not have any private or other attrs. | |
60 | */ | |
0896b752 AA |
61 | struct transport_container conn_cont; |
62 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
63 | struct transport_container session_cont; | |
1da177e4 | 64 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
65 | }; |
66 | ||
0896b752 AA |
67 | /* |
68 | * list of registered transports and lock that must | |
69 | * be held while accessing list. The iscsi_transport_lock must | |
70 | * be acquired after the rx_queue_sema. | |
71 | */ | |
72 | static LIST_HEAD(iscsi_transports); | |
73 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
74 | ||
75 | #define to_iscsi_internal(tmpl) \ | |
76 | container_of(tmpl, struct iscsi_internal, t) | |
77 | ||
78 | #define cdev_to_iscsi_internal(_cdev) \ | |
79 | container_of(_cdev, struct iscsi_internal, cdev) | |
80 | ||
81 | static void iscsi_transport_release(struct class_device *cdev) | |
82 | { | |
83 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
84 | kfree(priv); | |
85 | } | |
1da177e4 | 86 | |
0896b752 AA |
87 | /* |
88 | * iscsi_transport_class represents the iscsi_transports that are | |
89 | * registered. | |
90 | */ | |
91 | static struct class iscsi_transport_class = { | |
92 | .name = "iscsi_transport", | |
93 | .release = iscsi_transport_release, | |
94 | }; | |
95 | ||
96 | static ssize_t | |
97 | show_transport_handle(struct class_device *cdev, char *buf) | |
98 | { | |
99 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
20e007b8 | 100 | return sprintf(buf, "%llu", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
101 | } |
102 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
103 | ||
104 | #define show_transport_attr(name, format) \ | |
105 | static ssize_t \ | |
106 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
107 | { \ | |
108 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
109 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
110 | } \ | |
111 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
112 | ||
113 | show_transport_attr(caps, "0x%x"); | |
114 | show_transport_attr(max_lun, "%d"); | |
115 | show_transport_attr(max_conn, "%d"); | |
116 | show_transport_attr(max_cmd_len, "%d"); | |
117 | ||
118 | static struct attribute *iscsi_transport_attrs[] = { | |
119 | &class_device_attr_handle.attr, | |
120 | &class_device_attr_caps.attr, | |
121 | &class_device_attr_max_lun.attr, | |
122 | &class_device_attr_max_conn.attr, | |
123 | &class_device_attr_max_cmd_len.attr, | |
124 | NULL, | |
125 | }; | |
126 | ||
127 | static struct attribute_group iscsi_transport_group = { | |
128 | .attrs = iscsi_transport_attrs, | |
129 | }; | |
130 | ||
131 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, | |
132 | "iscsi_session", | |
1da177e4 LT |
133 | NULL, |
134 | NULL, | |
135 | NULL); | |
136 | ||
0896b752 AA |
137 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
138 | "iscsi_connection", | |
1da177e4 LT |
139 | NULL, |
140 | NULL, | |
141 | NULL); | |
0896b752 AA |
142 | |
143 | static struct sock *nls; | |
144 | static int daemon_pid; | |
145 | static DECLARE_MUTEX(rx_queue_sema); | |
146 | ||
147 | struct mempool_zone { | |
148 | mempool_t *pool; | |
149 | atomic_t allocated; | |
150 | int size; | |
151 | int hiwat; | |
152 | struct list_head freequeue; | |
153 | spinlock_t freelock; | |
154 | }; | |
155 | ||
156 | static struct mempool_zone z_reply; | |
157 | ||
1da177e4 | 158 | /* |
0896b752 AA |
159 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
160 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
161 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
162 | * be able to predict or change operational behavior | |
1da177e4 | 163 | */ |
0896b752 AA |
164 | #define Z_MAX_REPLY 8 |
165 | #define Z_HIWAT_REPLY 6 | |
166 | #define Z_MAX_PDU 8 | |
167 | #define Z_HIWAT_PDU 6 | |
168 | #define Z_MAX_ERROR 16 | |
169 | #define Z_HIWAT_ERROR 12 | |
170 | ||
171 | struct iscsi_if_conn { | |
172 | struct list_head conn_list; /* item in connlist */ | |
173 | struct list_head session_list; /* item in session->connections */ | |
174 | iscsi_connh_t connh; | |
175 | int active; /* must be accessed with the connlock */ | |
176 | struct Scsi_Host *host; /* originated shost */ | |
177 | struct device dev; /* sysfs transport/container device */ | |
178 | struct iscsi_transport *transport; | |
179 | struct mempool_zone z_error; | |
180 | struct mempool_zone z_pdu; | |
181 | struct list_head freequeue; | |
182 | }; | |
183 | ||
184 | #define iscsi_dev_to_if_conn(_dev) \ | |
185 | container_of(_dev, struct iscsi_if_conn, dev) | |
186 | ||
187 | #define iscsi_cdev_to_if_conn(_cdev) \ | |
188 | iscsi_dev_to_if_conn(_cdev->dev) | |
189 | ||
190 | static LIST_HEAD(connlist); | |
191 | static DEFINE_SPINLOCK(connlock); | |
192 | ||
193 | struct iscsi_if_session { | |
194 | struct list_head list; /* item in session_list */ | |
195 | struct list_head connections; | |
196 | iscsi_sessionh_t sessionh; | |
197 | struct iscsi_transport *transport; | |
198 | struct device dev; /* sysfs transport/container device */ | |
199 | }; | |
200 | ||
201 | #define iscsi_dev_to_if_session(_dev) \ | |
202 | container_of(_dev, struct iscsi_if_session, dev) | |
203 | ||
204 | #define iscsi_cdev_to_if_session(_cdev) \ | |
205 | iscsi_dev_to_if_session(_cdev->dev) | |
206 | ||
207 | #define iscsi_if_session_to_shost(_session) \ | |
208 | dev_to_shost(_session->dev.parent) | |
209 | ||
210 | static struct iscsi_if_conn* | |
211 | iscsi_if_find_conn(uint64_t key) | |
212 | { | |
213 | unsigned long flags; | |
214 | struct iscsi_if_conn *conn; | |
215 | ||
216 | spin_lock_irqsave(&connlock, flags); | |
217 | list_for_each_entry(conn, &connlist, conn_list) | |
218 | if (conn->connh == key) { | |
219 | spin_unlock_irqrestore(&connlock, flags); | |
220 | return conn; | |
221 | } | |
222 | spin_unlock_irqrestore(&connlock, flags); | |
223 | return NULL; | |
1da177e4 LT |
224 | } |
225 | ||
0896b752 AA |
226 | static struct iscsi_internal * |
227 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
228 | { | |
229 | struct iscsi_internal *priv; | |
230 | unsigned long flags; | |
231 | ||
232 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
233 | list_for_each_entry(priv, &iscsi_transports, list) { | |
234 | if (tt == priv->iscsi_transport) { | |
235 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
236 | return priv; | |
237 | } | |
238 | } | |
239 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
240 | return NULL; | |
241 | } | |
1da177e4 | 242 | |
0896b752 AA |
243 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
244 | { | |
245 | return (struct list_head *)&skb->cb; | |
246 | } | |
1da177e4 | 247 | |
0896b752 AA |
248 | static void* |
249 | mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data) | |
250 | { | |
251 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 252 | |
0896b752 | 253 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
254 | } |
255 | ||
0896b752 AA |
256 | static void |
257 | mempool_zone_free_skb(void *element, void *pool_data) | |
258 | { | |
259 | kfree_skb(element); | |
260 | } | |
1da177e4 | 261 | |
0896b752 AA |
262 | static void |
263 | mempool_zone_complete(struct mempool_zone *zone) | |
264 | { | |
265 | unsigned long flags; | |
266 | struct list_head *lh, *n; | |
1da177e4 | 267 | |
0896b752 AA |
268 | spin_lock_irqsave(&zone->freelock, flags); |
269 | list_for_each_safe(lh, n, &zone->freequeue) { | |
270 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
271 | offsetof(struct sk_buff, cb)); | |
272 | if (!skb_shared(skb)) { | |
273 | list_del(skb_to_lh(skb)); | |
274 | mempool_free(skb, zone->pool); | |
275 | atomic_dec(&zone->allocated); | |
276 | } | |
277 | } | |
278 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
279 | } |
280 | ||
0896b752 AA |
281 | static int |
282 | mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size, | |
283 | unsigned hiwat) | |
284 | { | |
285 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, | |
286 | mempool_zone_free_skb, zp); | |
287 | if (!zp->pool) | |
288 | return -ENOMEM; | |
1da177e4 | 289 | |
0896b752 AA |
290 | zp->size = size; |
291 | zp->hiwat = hiwat; | |
1da177e4 | 292 | |
0896b752 AA |
293 | INIT_LIST_HEAD(&zp->freequeue); |
294 | spin_lock_init(&zp->freelock); | |
295 | atomic_set(&zp->allocated, 0); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | ||
301 | static struct sk_buff* | |
302 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 303 | { |
0896b752 AA |
304 | struct sk_buff *skb; |
305 | ||
306 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
307 | if (skb) | |
308 | atomic_inc(&zone->allocated); | |
309 | return skb; | |
310 | } | |
1da177e4 | 311 | |
0896b752 AA |
312 | static int |
313 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
314 | { | |
315 | unsigned long flags; | |
316 | int rc; | |
1da177e4 | 317 | |
0896b752 AA |
318 | skb_get(skb); |
319 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
320 | if (rc < 0) { | |
321 | mempool_free(skb, zone->pool); | |
322 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
323 | return rc; | |
324 | } | |
325 | ||
326 | spin_lock_irqsave(&zone->freelock, flags); | |
327 | list_add(skb_to_lh(skb), &zone->freequeue); | |
328 | spin_unlock_irqrestore(&zone->freelock, flags); | |
329 | ||
330 | return 0; | |
1da177e4 | 331 | } |
1da177e4 | 332 | |
0896b752 AA |
333 | int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, |
334 | char *data, uint32_t data_size) | |
1da177e4 | 335 | { |
0896b752 AA |
336 | struct nlmsghdr *nlh; |
337 | struct sk_buff *skb; | |
338 | struct iscsi_uevent *ev; | |
339 | struct iscsi_if_conn *conn; | |
340 | char *pdu; | |
341 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
342 | data_size); | |
343 | ||
344 | conn = iscsi_if_find_conn(connh); | |
345 | BUG_ON(!conn); | |
346 | ||
347 | mempool_zone_complete(&conn->z_pdu); | |
348 | ||
349 | skb = mempool_zone_get_skb(&conn->z_pdu); | |
350 | if (!skb) { | |
351 | iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED); | |
352 | printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n", | |
353 | conn->host->host_no); | |
354 | return -ENOMEM; | |
355 | } | |
1da177e4 | 356 | |
0896b752 AA |
357 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
358 | ev = NLMSG_DATA(nlh); | |
359 | memset(ev, 0, sizeof(*ev)); | |
360 | ev->transport_handle = iscsi_handle(conn->transport); | |
361 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
362 | if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat) | |
363 | ev->iferror = -ENOMEM; | |
364 | ev->r.recv_req.conn_handle = connh; | |
365 | pdu = (char*)ev + sizeof(*ev); | |
366 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
367 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 368 | |
0896b752 | 369 | return iscsi_unicast_skb(&conn->z_pdu, skb); |
1da177e4 | 370 | } |
0896b752 | 371 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 372 | |
0896b752 | 373 | void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error) |
1da177e4 | 374 | { |
0896b752 AA |
375 | struct nlmsghdr *nlh; |
376 | struct sk_buff *skb; | |
377 | struct iscsi_uevent *ev; | |
378 | struct iscsi_if_conn *conn; | |
379 | int len = NLMSG_SPACE(sizeof(*ev)); | |
380 | ||
381 | conn = iscsi_if_find_conn(connh); | |
382 | BUG_ON(!conn); | |
383 | ||
384 | mempool_zone_complete(&conn->z_error); | |
385 | ||
386 | skb = mempool_zone_get_skb(&conn->z_error); | |
387 | if (!skb) { | |
388 | printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n", | |
389 | conn->host->host_no, error); | |
390 | return; | |
391 | } | |
392 | ||
393 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
394 | ev = NLMSG_DATA(nlh); | |
395 | ev->transport_handle = iscsi_handle(conn->transport); | |
396 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
397 | if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat) | |
398 | ev->iferror = -ENOMEM; | |
399 | ev->r.connerror.error = error; | |
400 | ev->r.connerror.conn_handle = connh; | |
1da177e4 | 401 | |
0896b752 | 402 | iscsi_unicast_skb(&conn->z_error, skb); |
1da177e4 | 403 | |
0896b752 AA |
404 | printk(KERN_INFO "iscsi%d: detected conn error (%d)\n", |
405 | conn->host->host_no, error); | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
408 | ||
409 | static int | |
410 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
411 | void *payload, int size) | |
412 | { | |
413 | struct sk_buff *skb; | |
414 | struct nlmsghdr *nlh; | |
415 | int len = NLMSG_SPACE(size); | |
416 | int flags = multi ? NLM_F_MULTI : 0; | |
417 | int t = done ? NLMSG_DONE : type; | |
418 | ||
419 | mempool_zone_complete(&z_reply); | |
420 | ||
421 | skb = mempool_zone_get_skb(&z_reply); | |
422 | /* | |
423 | * FIXME: | |
424 | * user is supposed to react on iferror == -ENOMEM; | |
425 | * see iscsi_if_rx(). | |
426 | */ | |
427 | BUG_ON(!skb); | |
428 | ||
429 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
430 | nlh->nlmsg_flags = flags; | |
431 | memcpy(NLMSG_DATA(nlh), payload, size); | |
432 | return iscsi_unicast_skb(&z_reply, skb); | |
1da177e4 | 433 | } |
1da177e4 LT |
434 | |
435 | /* | |
0896b752 AA |
436 | * iSCSI Session's hostdata organization: |
437 | * | |
438 | * *------------------* <== host->hostdata | |
439 | * | transport | | |
440 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
441 | * | transport's data | | |
442 | * |------------------| <== hostdata_session(host->hostdata) | |
443 | * | interface's data | | |
444 | * *------------------* | |
1da177e4 | 445 | */ |
0896b752 AA |
446 | |
447 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
448 | _t->hostdata_size % sizeof(unsigned long) + \ | |
449 | sizeof(struct iscsi_if_session)) | |
450 | ||
451 | #define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \ | |
452 | ((struct iscsi_transport *) \ | |
453 | iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size) | |
454 | ||
455 | static void iscsi_if_session_dev_release(struct device *dev) | |
456 | { | |
457 | struct iscsi_if_session *session = iscsi_dev_to_if_session(dev); | |
458 | struct iscsi_transport *transport = session->transport; | |
459 | struct Scsi_Host *shost = iscsi_if_session_to_shost(session); | |
460 | struct iscsi_if_conn *conn, *tmp; | |
461 | unsigned long flags; | |
462 | ||
463 | /* now free connections */ | |
464 | spin_lock_irqsave(&connlock, flags); | |
465 | list_for_each_entry_safe(conn, tmp, &session->connections, | |
466 | session_list) { | |
467 | list_del(&conn->session_list); | |
468 | mempool_destroy(conn->z_pdu.pool); | |
469 | mempool_destroy(conn->z_error.pool); | |
470 | kfree(conn); | |
471 | } | |
472 | spin_unlock_irqrestore(&connlock, flags); | |
473 | scsi_host_put(shost); | |
474 | module_put(transport->owner); | |
475 | } | |
476 | ||
477 | static int | |
478 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
479 | { | |
480 | struct iscsi_transport *transport = priv->iscsi_transport; | |
481 | struct iscsi_if_session *session; | |
482 | struct Scsi_Host *shost; | |
483 | unsigned long flags; | |
484 | int error; | |
485 | ||
486 | if (!try_module_get(transport->owner)) | |
487 | return -EPERM; | |
488 | ||
489 | shost = scsi_host_alloc(transport->host_template, | |
490 | hostdata_privsize(transport)); | |
491 | if (!shost) { | |
492 | ev->r.c_session_ret.session_handle = iscsi_handle(NULL); | |
493 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
494 | "session\n"); | |
495 | error = -ENOMEM; | |
496 | goto out_module_put; | |
497 | } | |
498 | shost->max_id = 1; | |
499 | shost->max_channel = 0; | |
500 | shost->max_lun = transport->max_lun; | |
501 | shost->max_cmd_len = transport->max_cmd_len; | |
502 | shost->transportt = &priv->t; | |
503 | ||
504 | /* store struct iscsi_transport in hostdata */ | |
505 | *(uint64_t*)shost->hostdata = ev->transport_handle; | |
506 | ||
507 | ev->r.c_session_ret.session_handle = transport->create_session( | |
508 | ev->u.c_session.initial_cmdsn, shost); | |
509 | if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) { | |
510 | error = 0; | |
511 | goto out_host_put; | |
512 | } | |
513 | ||
514 | /* host_no becomes assigned SID */ | |
515 | ev->r.c_session_ret.sid = shost->host_no; | |
516 | /* initialize session */ | |
517 | session = hostdata_session(shost->hostdata); | |
518 | INIT_LIST_HEAD(&session->connections); | |
519 | INIT_LIST_HEAD(&session->list); | |
520 | session->sessionh = ev->r.c_session_ret.session_handle; | |
521 | session->transport = transport; | |
522 | ||
523 | error = scsi_add_host(shost, NULL); | |
524 | if (error) | |
525 | goto out_destroy_session; | |
526 | ||
527 | /* | |
528 | * this is released in the dev's release function) | |
529 | */ | |
530 | scsi_host_get(shost); | |
531 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); | |
532 | session->dev.parent = &shost->shost_gendev; | |
533 | session->dev.release = iscsi_if_session_dev_release; | |
534 | error = device_register(&session->dev); | |
535 | if (error) { | |
536 | printk(KERN_ERR "iscsi: could not register session%d's dev\n", | |
537 | shost->host_no); | |
538 | goto out_remove_host; | |
539 | } | |
540 | transport_register_device(&session->dev); | |
541 | ||
542 | /* add this session to the list of active sessions */ | |
543 | spin_lock_irqsave(&priv->session_lock, flags); | |
544 | list_add(&session->list, &priv->sessions); | |
545 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
546 | ||
547 | return 0; | |
548 | ||
549 | out_remove_host: | |
550 | scsi_remove_host(shost); | |
551 | out_destroy_session: | |
552 | transport->destroy_session(ev->r.c_session_ret.session_handle); | |
553 | ev->r.c_session_ret.session_handle = iscsi_handle(NULL); | |
554 | out_host_put: | |
555 | scsi_host_put(shost); | |
556 | out_module_put: | |
557 | module_put(transport->owner); | |
558 | return error; | |
559 | } | |
560 | ||
561 | static int | |
562 | iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
563 | { | |
564 | struct iscsi_transport *transport = priv->iscsi_transport; | |
565 | struct Scsi_Host *shost; | |
566 | struct iscsi_if_session *session; | |
567 | unsigned long flags; | |
568 | struct iscsi_if_conn *conn; | |
569 | int error = 0; | |
570 | ||
571 | shost = scsi_host_lookup(ev->u.d_session.sid); | |
572 | if (shost == ERR_PTR(-ENXIO)) | |
573 | return -EEXIST; | |
574 | session = hostdata_session(shost->hostdata); | |
575 | ||
576 | /* check if we have active connections */ | |
577 | spin_lock_irqsave(&connlock, flags); | |
578 | list_for_each_entry(conn, &session->connections, session_list) { | |
579 | if (conn->active) { | |
580 | printk(KERN_ERR "iscsi%d: can not destroy session: " | |
581 | "has active connection (%p)\n", | |
582 | shost->host_no, iscsi_ptr(conn->connh)); | |
583 | spin_unlock_irqrestore(&connlock, flags); | |
584 | error = EIO; | |
585 | goto out_release_ref; | |
586 | } | |
587 | } | |
588 | spin_unlock_irqrestore(&connlock, flags); | |
589 | ||
590 | scsi_remove_host(shost); | |
591 | transport->destroy_session(ev->u.d_session.session_handle); | |
592 | transport_unregister_device(&session->dev); | |
593 | device_unregister(&session->dev); | |
594 | ||
595 | /* remove this session from the list of active sessions */ | |
596 | spin_lock_irqsave(&priv->session_lock, flags); | |
597 | list_del(&session->list); | |
598 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
599 | ||
600 | /* ref from host alloc */ | |
601 | scsi_host_put(shost); | |
602 | out_release_ref: | |
603 | /* ref from host lookup */ | |
604 | scsi_host_put(shost); | |
605 | return error; | |
606 | } | |
607 | ||
608 | static void iscsi_if_conn_dev_release(struct device *dev) | |
609 | { | |
610 | struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev); | |
611 | struct Scsi_Host *shost = conn->host; | |
612 | ||
613 | scsi_host_put(shost); | |
614 | } | |
615 | ||
616 | static int | |
617 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
618 | { | |
619 | struct iscsi_if_session *session; | |
620 | struct Scsi_Host *shost; | |
621 | struct iscsi_if_conn *conn; | |
622 | unsigned long flags; | |
623 | int error; | |
624 | ||
625 | shost = scsi_host_lookup(ev->u.c_conn.sid); | |
626 | if (shost == ERR_PTR(-ENXIO)) | |
627 | return -EEXIST; | |
628 | session = hostdata_session(shost->hostdata); | |
629 | ||
630 | conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL); | |
631 | if (!conn) { | |
632 | error = -ENOMEM; | |
633 | goto out_release_ref; | |
634 | } | |
635 | memset(conn, 0, sizeof(struct iscsi_if_conn)); | |
636 | INIT_LIST_HEAD(&conn->session_list); | |
637 | INIT_LIST_HEAD(&conn->conn_list); | |
638 | conn->host = shost; | |
639 | conn->transport = transport; | |
640 | ||
641 | error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU, | |
642 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
643 | sizeof(struct iscsi_hdr) + | |
644 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
645 | Z_HIWAT_PDU); | |
646 | if (error) { | |
647 | printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new " | |
648 | "conn\n", shost->host_no); | |
649 | goto out_free_conn; | |
650 | } | |
651 | error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR, | |
652 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), | |
653 | Z_HIWAT_ERROR); | |
654 | if (error) { | |
655 | printk(KERN_ERR "iscsi%d: can not allocate error zone for " | |
656 | "new conn\n", shost->host_no); | |
657 | goto out_free_pdu_pool; | |
658 | } | |
659 | ||
660 | ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle, | |
661 | ev->u.c_conn.cid); | |
662 | if (!ev->r.handle) { | |
663 | error = -ENODEV; | |
664 | goto out_free_error_pool; | |
665 | } | |
666 | ||
667 | conn->connh = ev->r.handle; | |
668 | ||
669 | /* | |
670 | * this is released in the dev's release function | |
671 | */ | |
672 | if (!scsi_host_get(shost)) | |
673 | goto out_destroy_conn; | |
674 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", | |
675 | shost->host_no, ev->u.c_conn.cid); | |
676 | conn->dev.parent = &session->dev; | |
677 | conn->dev.release = iscsi_if_conn_dev_release; | |
678 | error = device_register(&conn->dev); | |
679 | if (error) { | |
680 | printk(KERN_ERR "iscsi%d: could not register connections%u " | |
681 | "dev\n", shost->host_no, ev->u.c_conn.cid); | |
682 | goto out_release_parent_ref; | |
683 | } | |
684 | transport_register_device(&conn->dev); | |
685 | ||
686 | spin_lock_irqsave(&connlock, flags); | |
687 | list_add(&conn->conn_list, &connlist); | |
688 | list_add(&conn->session_list, &session->connections); | |
689 | conn->active = 1; | |
690 | spin_unlock_irqrestore(&connlock, flags); | |
691 | ||
692 | scsi_host_put(shost); | |
693 | return 0; | |
694 | ||
695 | out_release_parent_ref: | |
696 | scsi_host_put(shost); | |
697 | out_destroy_conn: | |
698 | transport->destroy_conn(ev->r.handle); | |
699 | out_free_error_pool: | |
700 | mempool_destroy(conn->z_error.pool); | |
701 | out_free_pdu_pool: | |
702 | mempool_destroy(conn->z_pdu.pool); | |
703 | out_free_conn: | |
704 | kfree(conn); | |
705 | out_release_ref: | |
706 | scsi_host_put(shost); | |
707 | return error; | |
1da177e4 LT |
708 | } |
709 | ||
0896b752 AA |
710 | static int |
711 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
712 | { | |
713 | unsigned long flags; | |
714 | struct iscsi_if_conn *conn; | |
715 | ||
716 | conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle); | |
717 | if (!conn) | |
718 | return -EEXIST; | |
719 | ||
720 | transport->destroy_conn(ev->u.d_conn.conn_handle); | |
721 | ||
722 | spin_lock_irqsave(&connlock, flags); | |
723 | conn->active = 0; | |
724 | list_del(&conn->conn_list); | |
725 | spin_unlock_irqrestore(&connlock, flags); | |
726 | ||
727 | transport_unregister_device(&conn->dev); | |
728 | device_unregister(&conn->dev); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int | |
733 | iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb, | |
734 | struct nlmsghdr *nlh) | |
735 | { | |
736 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
737 | struct iscsi_stats *stats; | |
738 | struct sk_buff *skbstat; | |
739 | struct iscsi_if_conn *conn; | |
740 | struct nlmsghdr *nlhstat; | |
741 | struct iscsi_uevent *evstat; | |
742 | int len = NLMSG_SPACE(sizeof(*ev) + | |
743 | sizeof(struct iscsi_stats) + | |
744 | sizeof(struct iscsi_stats_custom) * | |
745 | ISCSI_STATS_CUSTOM_MAX); | |
746 | int err = 0; | |
747 | ||
748 | conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle); | |
749 | if (!conn) | |
750 | return -EEXIST; | |
751 | ||
752 | do { | |
753 | int actual_size; | |
754 | ||
755 | mempool_zone_complete(&conn->z_pdu); | |
756 | ||
757 | skbstat = mempool_zone_get_skb(&conn->z_pdu); | |
758 | if (!skbstat) { | |
759 | printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n", | |
760 | conn->host->host_no); | |
761 | return -ENOMEM; | |
762 | } | |
763 | ||
764 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
765 | (len - sizeof(*nlhstat)), 0); | |
766 | evstat = NLMSG_DATA(nlhstat); | |
767 | memset(evstat, 0, sizeof(*evstat)); | |
768 | evstat->transport_handle = iscsi_handle(conn->transport); | |
769 | evstat->type = nlh->nlmsg_type; | |
770 | if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat) | |
771 | evstat->iferror = -ENOMEM; | |
772 | evstat->u.get_stats.conn_handle = | |
773 | ev->u.get_stats.conn_handle; | |
774 | stats = (struct iscsi_stats *) | |
775 | ((char*)evstat + sizeof(*evstat)); | |
776 | memset(stats, 0, sizeof(*stats)); | |
777 | ||
778 | transport->get_stats(ev->u.get_stats.conn_handle, stats); | |
779 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
780 | sizeof(struct iscsi_stats) + | |
781 | sizeof(struct iscsi_stats_custom) * | |
782 | stats->custom_length); | |
783 | actual_size -= sizeof(*nlhstat); | |
784 | actual_size = NLMSG_LENGTH(actual_size); | |
785 | skb_trim(skb, NLMSG_ALIGN(actual_size)); | |
786 | nlhstat->nlmsg_len = actual_size; | |
787 | ||
788 | err = iscsi_unicast_skb(&conn->z_pdu, skbstat); | |
789 | } while (err < 0 && err != -ECONNREFUSED); | |
790 | ||
791 | return err; | |
792 | } | |
793 | ||
794 | static int | |
795 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
796 | { | |
797 | int err = 0; | |
798 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
799 | struct iscsi_transport *transport = NULL; | |
800 | struct iscsi_internal *priv; | |
801 | ||
802 | if (NETLINK_CREDS(skb)->uid) | |
803 | return -EPERM; | |
804 | ||
805 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); | |
806 | if (!priv) | |
807 | return -EINVAL; | |
808 | transport = priv->iscsi_transport; | |
809 | ||
810 | daemon_pid = NETLINK_CREDS(skb)->pid; | |
811 | ||
812 | switch (nlh->nlmsg_type) { | |
813 | case ISCSI_UEVENT_CREATE_SESSION: | |
814 | err = iscsi_if_create_session(priv, ev); | |
815 | break; | |
816 | case ISCSI_UEVENT_DESTROY_SESSION: | |
817 | err = iscsi_if_destroy_session(priv, ev); | |
818 | break; | |
819 | case ISCSI_UEVENT_CREATE_CONN: | |
820 | err = iscsi_if_create_conn(transport, ev); | |
821 | break; | |
822 | case ISCSI_UEVENT_DESTROY_CONN: | |
823 | err = iscsi_if_destroy_conn(transport, ev); | |
824 | break; | |
825 | case ISCSI_UEVENT_BIND_CONN: | |
826 | if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle)) | |
827 | return -EEXIST; | |
828 | ev->r.retcode = transport->bind_conn( | |
829 | ev->u.b_conn.session_handle, | |
830 | ev->u.b_conn.conn_handle, | |
831 | ev->u.b_conn.transport_fd, | |
832 | ev->u.b_conn.is_leading); | |
833 | break; | |
834 | case ISCSI_UEVENT_SET_PARAM: | |
835 | if (!iscsi_if_find_conn(ev->u.set_param.conn_handle)) | |
836 | return -EEXIST; | |
837 | ev->r.retcode = transport->set_param( | |
838 | ev->u.set_param.conn_handle, | |
839 | ev->u.set_param.param, ev->u.set_param.value); | |
840 | break; | |
841 | case ISCSI_UEVENT_START_CONN: | |
842 | if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle)) | |
843 | return -EEXIST; | |
844 | ev->r.retcode = transport->start_conn( | |
845 | ev->u.start_conn.conn_handle); | |
846 | break; | |
847 | case ISCSI_UEVENT_STOP_CONN: | |
848 | if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle)) | |
849 | return -EEXIST; | |
850 | transport->stop_conn(ev->u.stop_conn.conn_handle, | |
851 | ev->u.stop_conn.flag); | |
852 | break; | |
853 | case ISCSI_UEVENT_SEND_PDU: | |
854 | if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle)) | |
855 | return -EEXIST; | |
856 | ev->r.retcode = transport->send_pdu( | |
857 | ev->u.send_pdu.conn_handle, | |
858 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
859 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
860 | ev->u.send_pdu.data_size); | |
861 | break; | |
862 | case ISCSI_UEVENT_GET_STATS: | |
863 | err = iscsi_if_get_stats(transport, skb, nlh); | |
864 | break; | |
865 | default: | |
866 | err = -EINVAL; | |
867 | break; | |
868 | } | |
869 | ||
870 | return err; | |
871 | } | |
872 | ||
873 | /* Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
874 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are | |
875 | * discarded silently. */ | |
876 | static void | |
877 | iscsi_if_rx(struct sock *sk, int len) | |
878 | { | |
879 | struct sk_buff *skb; | |
1da177e4 | 880 | |
0896b752 AA |
881 | down(&rx_queue_sema); |
882 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
883 | while (skb->len >= NLMSG_SPACE(0)) { | |
884 | int err; | |
885 | uint32_t rlen; | |
886 | struct nlmsghdr *nlh; | |
887 | struct iscsi_uevent *ev; | |
888 | ||
889 | nlh = (struct nlmsghdr *)skb->data; | |
890 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
891 | skb->len < nlh->nlmsg_len) { | |
892 | break; | |
893 | } | |
894 | ev = NLMSG_DATA(nlh); | |
895 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
896 | if (rlen > skb->len) | |
897 | rlen = skb->len; | |
898 | err = iscsi_if_recv_msg(skb, nlh); | |
899 | if (err) { | |
900 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
901 | ev->iferror = err; | |
902 | } | |
903 | do { | |
904 | /* | |
905 | * special case for GET_STATS: | |
906 | * on success - sending reply and stats from | |
907 | * inside of if_recv_msg(), | |
908 | * on error - fall through. | |
909 | */ | |
910 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
911 | break; | |
912 | err = iscsi_if_send_reply( | |
913 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
914 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
915 | if (atomic_read(&z_reply.allocated) >= | |
916 | z_reply.hiwat) | |
917 | ev->iferror = -ENOMEM; | |
918 | } while (err < 0 && err != -ECONNREFUSED); | |
919 | skb_pull(skb, rlen); | |
920 | } | |
921 | kfree_skb(skb); | |
922 | } | |
923 | up(&rx_queue_sema); | |
924 | } | |
1da177e4 LT |
925 | |
926 | /* | |
0896b752 | 927 | * iSCSI connection attrs |
1da177e4 | 928 | */ |
0896b752 AA |
929 | #define iscsi_conn_int_attr_show(param, format) \ |
930 | static ssize_t \ | |
931 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
932 | { \ | |
933 | uint32_t value = 0; \ | |
934 | struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \ | |
935 | struct iscsi_internal *priv; \ | |
936 | \ | |
937 | priv = to_iscsi_internal(conn->host->transportt); \ | |
938 | if (priv->param_mask & (1 << param)) \ | |
939 | priv->iscsi_transport->get_param(conn->connh, param, &value); \ | |
940 | return snprintf(buf, 20, format"\n", value); \ | |
941 | } | |
942 | ||
943 | #define iscsi_conn_int_attr(field, param, format) \ | |
944 | iscsi_conn_int_attr_show(param, format) \ | |
945 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); | |
946 | ||
947 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
948 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
949 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
950 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
951 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
952 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
1da177e4 LT |
953 | |
954 | /* | |
0896b752 | 955 | * iSCSI session attrs |
1da177e4 | 956 | */ |
0896b752 | 957 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 958 | static ssize_t \ |
0896b752 | 959 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 960 | { \ |
0896b752 AA |
961 | uint32_t value = 0; \ |
962 | struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \ | |
963 | struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \ | |
964 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ | |
965 | struct iscsi_if_conn *conn = NULL; \ | |
966 | unsigned long flags; \ | |
967 | \ | |
968 | spin_lock_irqsave(&connlock, flags); \ | |
969 | if (!list_empty(&session->connections)) \ | |
970 | conn = list_entry(session->connections.next, \ | |
971 | struct iscsi_if_conn, session_list); \ | |
972 | spin_unlock_irqrestore(&connlock, flags); \ | |
1da177e4 | 973 | \ |
0896b752 AA |
974 | if (conn && (priv->param_mask & (1 << param))) \ |
975 | priv->iscsi_transport->get_param(conn->connh, param, &value);\ | |
976 | return snprintf(buf, 20, format"\n", value); \ | |
1da177e4 LT |
977 | } |
978 | ||
0896b752 AA |
979 | #define iscsi_session_int_attr(field, param, format) \ |
980 | iscsi_session_int_attr_show(param, format) \ | |
981 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); | |
1da177e4 | 982 | |
0896b752 AA |
983 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
984 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
985 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
986 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
987 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
988 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
989 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
990 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
1da177e4 | 991 | |
0896b752 AA |
992 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
993 | if (priv->param_mask & (1 << param)) { \ | |
994 | priv->session_attrs[count] = &class_device_attr_##field;\ | |
1da177e4 LT |
995 | count++; \ |
996 | } | |
997 | ||
0896b752 AA |
998 | #define SETUP_CONN_RD_ATTR(field, param) \ |
999 | if (priv->param_mask & (1 << param)) { \ | |
1000 | priv->conn_attrs[count] = &class_device_attr_##field; \ | |
1da177e4 LT |
1001 | count++; \ |
1002 | } | |
1003 | ||
0896b752 AA |
1004 | static int iscsi_is_session_dev(const struct device *dev) |
1005 | { | |
1006 | return dev->release == iscsi_if_session_dev_release; | |
1007 | } | |
1008 | ||
1009 | static int iscsi_session_match(struct attribute_container *cont, | |
1010 | struct device *dev) | |
1da177e4 | 1011 | { |
0896b752 | 1012 | struct iscsi_if_session *session; |
1da177e4 | 1013 | struct Scsi_Host *shost; |
0896b752 AA |
1014 | struct iscsi_internal *priv; |
1015 | ||
1016 | if (!iscsi_is_session_dev(dev)) | |
1017 | return 0; | |
1da177e4 | 1018 | |
0896b752 AA |
1019 | session = iscsi_dev_to_if_session(dev); |
1020 | shost = iscsi_if_session_to_shost(session); | |
1021 | if (!shost->transportt) | |
1da177e4 LT |
1022 | return 0; |
1023 | ||
0896b752 AA |
1024 | priv = to_iscsi_internal(shost->transportt); |
1025 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1026 | return 0; |
1027 | ||
0896b752 | 1028 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1029 | } |
1030 | ||
0896b752 | 1031 | static int iscsi_is_conn_dev(const struct device *dev) |
1da177e4 | 1032 | { |
0896b752 AA |
1033 | return dev->release == iscsi_if_conn_dev_release; |
1034 | } | |
1035 | ||
1036 | static int iscsi_conn_match(struct attribute_container *cont, | |
1037 | struct device *dev) | |
1038 | { | |
1039 | struct iscsi_if_conn *conn; | |
1da177e4 | 1040 | struct Scsi_Host *shost; |
0896b752 | 1041 | struct iscsi_internal *priv; |
1da177e4 | 1042 | |
0896b752 | 1043 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1044 | return 0; |
1045 | ||
0896b752 AA |
1046 | conn = iscsi_dev_to_if_conn(dev); |
1047 | shost = conn->host; | |
1048 | if (!shost->transportt) | |
1da177e4 LT |
1049 | return 0; |
1050 | ||
0896b752 AA |
1051 | priv = to_iscsi_internal(shost->transportt); |
1052 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1053 | return 0; | |
1da177e4 | 1054 | |
0896b752 AA |
1055 | return &priv->conn_cont.ac == cont; |
1056 | } | |
1057 | ||
1058 | int iscsi_register_transport(struct iscsi_transport *tt) | |
1059 | { | |
1060 | struct iscsi_internal *priv; | |
1061 | unsigned long flags; | |
1062 | int count = 0, err; | |
1063 | ||
1064 | BUG_ON(!tt); | |
1065 | ||
1066 | priv = iscsi_if_transport_lookup(tt); | |
1067 | if (priv) | |
1068 | return -EEXIST; | |
1069 | ||
1070 | priv = kmalloc(sizeof(*priv), GFP_KERNEL); | |
1071 | if (!priv) | |
1072 | return -ENOMEM; | |
1073 | memset(priv, 0, sizeof(*priv)); | |
1074 | INIT_LIST_HEAD(&priv->list); | |
1075 | INIT_LIST_HEAD(&priv->sessions); | |
1076 | spin_lock_init(&priv->session_lock); | |
1077 | priv->iscsi_transport = tt; | |
1078 | ||
1079 | priv->cdev.class = &iscsi_transport_class; | |
1080 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1081 | err = class_device_register(&priv->cdev); | |
1082 | if (err) | |
1083 | goto free_priv; | |
1084 | ||
1085 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1086 | if (err) | |
1087 | goto unregister_cdev; | |
1088 | ||
1089 | /* setup parameters mask */ | |
1090 | priv->param_mask = 0xFFFFFFFF; | |
1091 | if (!(tt->caps & CAP_MULTI_R2T)) | |
1092 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); | |
1093 | if (!(tt->caps & CAP_HDRDGST)) | |
1094 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); | |
1095 | if (!(tt->caps & CAP_DATADGST)) | |
1096 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); | |
1097 | if (!(tt->caps & CAP_MARKERS)) { | |
1098 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); | |
1099 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); | |
1100 | } | |
1da177e4 | 1101 | |
0896b752 AA |
1102 | /* connection parameters */ |
1103 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1104 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1105 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1106 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1107 | |
0896b752 AA |
1108 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1109 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1110 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1111 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1112 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1113 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1114 | ||
1115 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1116 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1117 | count = 0; |
1da177e4 | 1118 | |
0896b752 AA |
1119 | /* session parameters */ |
1120 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1121 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1122 | priv->session_cont.ac.match = iscsi_session_match; | |
1123 | transport_container_register(&priv->session_cont); | |
1124 | ||
1125 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1126 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1127 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1128 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1129 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1130 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1131 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) | |
1132 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); | |
1133 | ||
1134 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1135 | priv->session_attrs[count] = NULL; | |
1136 | ||
1137 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1138 | list_add(&priv->list, &iscsi_transports); | |
1139 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1140 | ||
1141 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
1142 | return 0; | |
1da177e4 | 1143 | |
0896b752 AA |
1144 | unregister_cdev: |
1145 | class_device_unregister(&priv->cdev); | |
1146 | free_priv: | |
1147 | kfree(priv); | |
1148 | return err; | |
1da177e4 | 1149 | } |
0896b752 AA |
1150 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1151 | ||
1152 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1153 | { | |
1154 | struct iscsi_internal *priv; | |
1155 | unsigned long flags; | |
1156 | ||
1157 | BUG_ON(!tt); | |
1158 | ||
1159 | down(&rx_queue_sema); | |
1160 | ||
1161 | priv = iscsi_if_transport_lookup(tt); | |
1162 | BUG_ON (!priv); | |
1163 | ||
1164 | spin_lock_irqsave(&priv->session_lock, flags); | |
1165 | if (!list_empty(&priv->sessions)) { | |
1166 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
1167 | up(&rx_queue_sema); | |
1168 | return -EPERM; | |
1169 | } | |
1170 | spin_unlock_irqrestore(&priv->session_lock, flags); | |
1171 | ||
1172 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1173 | list_del(&priv->list); | |
1174 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1175 | ||
1176 | transport_container_unregister(&priv->conn_cont); | |
1177 | transport_container_unregister(&priv->session_cont); | |
1178 | ||
1179 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1180 | class_device_unregister(&priv->cdev); | |
1181 | up(&rx_queue_sema); | |
1da177e4 | 1182 | |
0896b752 AA |
1183 | return 0; |
1184 | } | |
1185 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1186 | |
0896b752 AA |
1187 | static int |
1188 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1189 | { |
0896b752 AA |
1190 | struct netlink_notify *n = ptr; |
1191 | ||
1192 | if (event == NETLINK_URELEASE && | |
1193 | n->protocol == NETLINK_ISCSI && n->pid) { | |
1194 | struct iscsi_if_conn *conn; | |
1195 | unsigned long flags; | |
1196 | ||
1197 | mempool_zone_complete(&z_reply); | |
1198 | spin_lock_irqsave(&connlock, flags); | |
1199 | list_for_each_entry(conn, &connlist, conn_list) { | |
1200 | mempool_zone_complete(&conn->z_error); | |
1201 | mempool_zone_complete(&conn->z_pdu); | |
1202 | } | |
1203 | spin_unlock_irqrestore(&connlock, flags); | |
1204 | } | |
1da177e4 | 1205 | |
0896b752 | 1206 | return NOTIFY_DONE; |
1da177e4 LT |
1207 | } |
1208 | ||
0896b752 AA |
1209 | static struct notifier_block iscsi_nl_notifier = { |
1210 | .notifier_call = iscsi_rcv_nl_event, | |
1211 | }; | |
1da177e4 LT |
1212 | |
1213 | static __init int iscsi_transport_init(void) | |
1214 | { | |
0896b752 | 1215 | int err; |
1da177e4 | 1216 | |
0896b752 | 1217 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1218 | if (err) |
1219 | return err; | |
0896b752 AA |
1220 | |
1221 | err = transport_class_register(&iscsi_connection_class); | |
1222 | if (err) | |
1223 | goto unregister_transport_class; | |
1224 | ||
1225 | err = transport_class_register(&iscsi_session_class); | |
1226 | if (err) | |
1227 | goto unregister_conn_class; | |
1228 | ||
1229 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1230 | if (err) | |
1231 | goto unregister_session_class; | |
1232 | ||
2290d2b6 JB |
1233 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
1234 | THIS_MODULE); | |
0896b752 AA |
1235 | if (!nls) { |
1236 | err = -ENOBUFS; | |
1237 | goto unregister_notifier; | |
1238 | } | |
1239 | ||
1240 | err = mempool_zone_init(&z_reply, Z_MAX_REPLY, | |
1241 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); | |
1242 | if (!err) | |
1243 | return 0; | |
1244 | ||
1245 | sock_release(nls->sk_socket); | |
1246 | unregister_notifier: | |
1247 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1248 | unregister_session_class: | |
1249 | transport_class_unregister(&iscsi_session_class); | |
1250 | unregister_conn_class: | |
1251 | transport_class_unregister(&iscsi_connection_class); | |
1252 | unregister_transport_class: | |
1253 | class_unregister(&iscsi_transport_class); | |
1254 | return err; | |
1da177e4 LT |
1255 | } |
1256 | ||
1257 | static void __exit iscsi_transport_exit(void) | |
1258 | { | |
0896b752 AA |
1259 | mempool_destroy(z_reply.pool); |
1260 | sock_release(nls->sk_socket); | |
1261 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1262 | transport_class_unregister(&iscsi_connection_class); | |
1263 | transport_class_unregister(&iscsi_session_class); | |
1264 | class_unregister(&iscsi_transport_class); | |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | module_init(iscsi_transport_init); | |
1268 | module_exit(iscsi_transport_exit); | |
1269 | ||
0896b752 AA |
1270 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1271 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1272 | "Alex Aizman <itn780@yahoo.com>"); | |
1273 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1274 | MODULE_LICENSE("GPL"); |