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[SCSI] iscsi class: expand vlan support
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / scsi_transport_iscsi.c
blob13f90515ff6eabfb8916a9267ba514259730e5a4
1 /*
2 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
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>
24 #include <linux/mutex.h>
25 #include <linux/slab.h>
26 #include <net/tcp.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_iscsi.h>
32 #include <scsi/iscsi_if.h>
33 #include <scsi/scsi_cmnd.h>
34
35 #define ISCSI_TRANSPORT_VERSION "2.0-870"
36
37 static int dbg_session;
38 module_param_named(debug_session, dbg_session, int,
39 S_IRUGO | S_IWUSR);
40 MODULE_PARM_DESC(debug_session,
41 "Turn on debugging for sessions in scsi_transport_iscsi "
42 "module. Set to 1 to turn on, and zero to turn off. Default "
43 "is off.");
44
45 static int dbg_conn;
46 module_param_named(debug_conn, dbg_conn, int,
47 S_IRUGO | S_IWUSR);
48 MODULE_PARM_DESC(debug_conn,
49 "Turn on debugging for connections in scsi_transport_iscsi "
50 "module. Set to 1 to turn on, and zero to turn off. Default "
51 "is off.");
52
53 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
54 do { \
55 if (dbg_session) \
56 iscsi_cls_session_printk(KERN_INFO, _session, \
57 "%s: " dbg_fmt, \
58 __func__, ##arg); \
59 } while (0);
60
61 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
62 do { \
63 if (dbg_conn) \
64 iscsi_cls_conn_printk(KERN_INFO, _conn, \
65 "%s: " dbg_fmt, \
66 __func__, ##arg); \
67 } while (0);
68
69 struct iscsi_internal {
70 struct scsi_transport_template t;
71 struct iscsi_transport *iscsi_transport;
72 struct list_head list;
73 struct device dev;
74
75 struct transport_container conn_cont;
76 struct transport_container session_cont;
77 };
78
79 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
80 static struct workqueue_struct *iscsi_eh_timer_workq;
81
82 /*
83 * list of registered transports and lock that must
84 * be held while accessing list. The iscsi_transport_lock must
85 * be acquired after the rx_queue_mutex.
86 */
87 static LIST_HEAD(iscsi_transports);
88 static DEFINE_SPINLOCK(iscsi_transport_lock);
89
90 #define to_iscsi_internal(tmpl) \
91 container_of(tmpl, struct iscsi_internal, t)
92
93 #define dev_to_iscsi_internal(_dev) \
94 container_of(_dev, struct iscsi_internal, dev)
95
96 static void iscsi_transport_release(struct device *dev)
97 {
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
99 kfree(priv);
100 }
101
102 /*
103 * iscsi_transport_class represents the iscsi_transports that are
104 * registered.
105 */
106 static struct class iscsi_transport_class = {
107 .name = "iscsi_transport",
108 .dev_release = iscsi_transport_release,
109 };
110
111 static ssize_t
112 show_transport_handle(struct device *dev, struct device_attribute *attr,
113 char *buf)
114 {
115 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
116 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
117 }
118 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
119
120 #define show_transport_attr(name, format) \
121 static ssize_t \
122 show_transport_##name(struct device *dev, \
123 struct device_attribute *attr,char *buf) \
124 { \
125 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
126 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
127 } \
128 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
129
130 show_transport_attr(caps, "0x%x");
131
132 static struct attribute *iscsi_transport_attrs[] = {
133 &dev_attr_handle.attr,
134 &dev_attr_caps.attr,
135 NULL,
136 };
137
138 static struct attribute_group iscsi_transport_group = {
139 .attrs = iscsi_transport_attrs,
140 };
141
142 /*
143 * iSCSI endpoint attrs
144 */
145 #define iscsi_dev_to_endpoint(_dev) \
146 container_of(_dev, struct iscsi_endpoint, dev)
147
148 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
149 struct device_attribute dev_attr_##_prefix##_##_name = \
150 __ATTR(_name,_mode,_show,_store)
151
152 static void iscsi_endpoint_release(struct device *dev)
153 {
154 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
155 kfree(ep);
156 }
157
158 static struct class iscsi_endpoint_class = {
159 .name = "iscsi_endpoint",
160 .dev_release = iscsi_endpoint_release,
161 };
162
163 static ssize_t
164 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
165 {
166 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
167 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
168 }
169 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
170
171 static struct attribute *iscsi_endpoint_attrs[] = {
172 &dev_attr_ep_handle.attr,
173 NULL,
174 };
175
176 static struct attribute_group iscsi_endpoint_group = {
177 .attrs = iscsi_endpoint_attrs,
178 };
179
180 #define ISCSI_MAX_EPID -1
181
182 static int iscsi_match_epid(struct device *dev, void *data)
183 {
184 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
185 uint64_t *epid = (uint64_t *) data;
186
187 return *epid == ep->id;
188 }
189
190 struct iscsi_endpoint *
191 iscsi_create_endpoint(int dd_size)
192 {
193 struct device *dev;
194 struct iscsi_endpoint *ep;
195 uint64_t id;
196 int err;
197
198 for (id = 1; id < ISCSI_MAX_EPID; id++) {
199 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
200 iscsi_match_epid);
201 if (!dev)
202 break;
203 }
204 if (id == ISCSI_MAX_EPID) {
205 printk(KERN_ERR "Too many connections. Max supported %u\n",
206 ISCSI_MAX_EPID - 1);
207 return NULL;
208 }
209
210 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
211 if (!ep)
212 return NULL;
213
214 ep->id = id;
215 ep->dev.class = &iscsi_endpoint_class;
216 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
217 err = device_register(&ep->dev);
218 if (err)
219 goto free_ep;
220
221 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
222 if (err)
223 goto unregister_dev;
224
225 if (dd_size)
226 ep->dd_data = &ep[1];
227 return ep;
228
229 unregister_dev:
230 device_unregister(&ep->dev);
231 return NULL;
232
233 free_ep:
234 kfree(ep);
235 return NULL;
236 }
237 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
238
239 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
240 {
241 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
242 device_unregister(&ep->dev);
243 }
244 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
245
246 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
247 {
248 struct iscsi_endpoint *ep;
249 struct device *dev;
250
251 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
252 iscsi_match_epid);
253 if (!dev)
254 return NULL;
255
256 ep = iscsi_dev_to_endpoint(dev);
257 /*
258 * we can drop this now because the interface will prevent
259 * removals and lookups from racing.
260 */
261 put_device(dev);
262 return ep;
263 }
264 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
265
266 /*
267 * Interface to display network param to sysfs
268 */
269
270 static void iscsi_iface_release(struct device *dev)
271 {
272 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
273 struct device *parent = iface->dev.parent;
274
275 kfree(iface);
276 put_device(parent);
277 }
278
279
280 static struct class iscsi_iface_class = {
281 .name = "iscsi_iface",
282 .dev_release = iscsi_iface_release,
283 };
284
285 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
286 struct device_attribute dev_attr_##_prefix##_##_name = \
287 __ATTR(_name, _mode, _show, _store)
288
289 /* iface attrs show */
290 #define iscsi_iface_attr_show(type, name, param_type, param) \
291 static ssize_t \
292 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
293 char *buf) \
294 { \
295 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
296 struct iscsi_transport *t = iface->transport; \
297 return t->get_iface_param(iface, param_type, param, buf); \
298 } \
299
300 #define iscsi_iface_net_attr(type, name, param) \
301 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
302 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
303
304 /* generic read only ipvi4 attribute */
305 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
306 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
307 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
308 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
309
310 /* generic read only ipv6 attribute */
311 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
312 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
313 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
314 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
315 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
316 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
317 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
318
319 /* common read only iface attribute */
320 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
321 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
322 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
323 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
324
325 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
326 struct attribute *attr, int i)
327 {
328 struct device *dev = container_of(kobj, struct device, kobj);
329 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
330 struct iscsi_transport *t = iface->transport;
331 int param;
332
333 if (attr == &dev_attr_iface_enabled.attr)
334 param = ISCSI_NET_PARAM_IFACE_ENABLE;
335 else if (attr == &dev_attr_iface_vlan.attr)
336 param = ISCSI_NET_PARAM_VLAN_ID;
337 else if (attr == &dev_attr_iface_vlan_priority.attr)
338 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
339 else if (attr == &dev_attr_iface_vlan_enabled.attr)
340 param = ISCSI_NET_PARAM_VLAN_ENABLED;
341 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
342 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
343 param = ISCSI_NET_PARAM_IPV4_ADDR;
344 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
345 param = ISCSI_NET_PARAM_IPV4_GW;
346 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
347 param = ISCSI_NET_PARAM_IPV4_SUBNET;
348 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
349 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
350 else
351 return 0;
352 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
353 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
354 param = ISCSI_NET_PARAM_IPV6_ADDR;
355 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
356 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
357 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
358 param = ISCSI_NET_PARAM_IPV6_ROUTER;
359 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
360 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
361 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
362 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
363 else
364 return 0;
365 } else {
366 WARN_ONCE(1, "Invalid iface attr");
367 return 0;
368 }
369
370 return t->attr_is_visible(ISCSI_NET_PARAM, param);
371 }
372
373 static struct attribute *iscsi_iface_attrs[] = {
374 &dev_attr_iface_enabled.attr,
375 &dev_attr_iface_vlan.attr,
376 &dev_attr_iface_vlan_priority.attr,
377 &dev_attr_iface_vlan_enabled.attr,
378 &dev_attr_ipv4_iface_ipaddress.attr,
379 &dev_attr_ipv4_iface_gateway.attr,
380 &dev_attr_ipv4_iface_subnet.attr,
381 &dev_attr_ipv4_iface_bootproto.attr,
382 &dev_attr_ipv6_iface_ipaddress.attr,
383 &dev_attr_ipv6_iface_link_local_addr.attr,
384 &dev_attr_ipv6_iface_router_addr.attr,
385 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
386 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
387 NULL,
388 };
389
390 static struct attribute_group iscsi_iface_group = {
391 .attrs = iscsi_iface_attrs,
392 .is_visible = iscsi_iface_attr_is_visible,
393 };
394
395 struct iscsi_iface *
396 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
397 uint32_t iface_type, uint32_t iface_num, int dd_size)
398 {
399 struct iscsi_iface *iface;
400 int err;
401
402 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
403 if (!iface)
404 return NULL;
405
406 iface->transport = transport;
407 iface->iface_type = iface_type;
408 iface->iface_num = iface_num;
409 iface->dev.release = iscsi_iface_release;
410 iface->dev.class = &iscsi_iface_class;
411 /* parent reference released in iscsi_iface_release */
412 iface->dev.parent = get_device(&shost->shost_gendev);
413 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
414 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
415 iface_num);
416 else
417 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
418 iface_num);
419
420 err = device_register(&iface->dev);
421 if (err)
422 goto free_iface;
423
424 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
425 if (err)
426 goto unreg_iface;
427
428 if (dd_size)
429 iface->dd_data = &iface[1];
430 return iface;
431
432 unreg_iface:
433 device_unregister(&iface->dev);
434 return NULL;
435
436 free_iface:
437 put_device(iface->dev.parent);
438 kfree(iface);
439 return NULL;
440 }
441 EXPORT_SYMBOL_GPL(iscsi_create_iface);
442
443 void iscsi_destroy_iface(struct iscsi_iface *iface)
444 {
445 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
446 device_unregister(&iface->dev);
447 }
448 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
449
450 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
451 struct device *cdev)
452 {
453 struct Scsi_Host *shost = dev_to_shost(dev);
454 struct iscsi_cls_host *ihost = shost->shost_data;
455
456 memset(ihost, 0, sizeof(*ihost));
457 atomic_set(&ihost->nr_scans, 0);
458 mutex_init(&ihost->mutex);
459 return 0;
460 }
461
462 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
463 "iscsi_host",
464 iscsi_setup_host,
465 NULL,
466 NULL);
467
468 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
469 "iscsi_session",
470 NULL,
471 NULL,
472 NULL);
473
474 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
475 "iscsi_connection",
476 NULL,
477 NULL,
478 NULL);
479
480 static struct sock *nls;
481 static DEFINE_MUTEX(rx_queue_mutex);
482
483 static LIST_HEAD(sesslist);
484 static DEFINE_SPINLOCK(sesslock);
485 static LIST_HEAD(connlist);
486 static DEFINE_SPINLOCK(connlock);
487
488 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
489 {
490 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
491 return sess->sid;
492 }
493
494 /*
495 * Returns the matching session to a given sid
496 */
497 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
498 {
499 unsigned long flags;
500 struct iscsi_cls_session *sess;
501
502 spin_lock_irqsave(&sesslock, flags);
503 list_for_each_entry(sess, &sesslist, sess_list) {
504 if (sess->sid == sid) {
505 spin_unlock_irqrestore(&sesslock, flags);
506 return sess;
507 }
508 }
509 spin_unlock_irqrestore(&sesslock, flags);
510 return NULL;
511 }
512
513 /*
514 * Returns the matching connection to a given sid / cid tuple
515 */
516 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
517 {
518 unsigned long flags;
519 struct iscsi_cls_conn *conn;
520
521 spin_lock_irqsave(&connlock, flags);
522 list_for_each_entry(conn, &connlist, conn_list) {
523 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
524 spin_unlock_irqrestore(&connlock, flags);
525 return conn;
526 }
527 }
528 spin_unlock_irqrestore(&connlock, flags);
529 return NULL;
530 }
531
532 /*
533 * The following functions can be used by LLDs that allocate
534 * their own scsi_hosts or by software iscsi LLDs
535 */
536 static struct {
537 int value;
538 char *name;
539 } iscsi_session_state_names[] = {
540 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
541 { ISCSI_SESSION_FAILED, "FAILED" },
542 { ISCSI_SESSION_FREE, "FREE" },
543 };
544
545 static const char *iscsi_session_state_name(int state)
546 {
547 int i;
548 char *name = NULL;
549
550 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
551 if (iscsi_session_state_names[i].value == state) {
552 name = iscsi_session_state_names[i].name;
553 break;
554 }
555 }
556 return name;
557 }
558
559 int iscsi_session_chkready(struct iscsi_cls_session *session)
560 {
561 unsigned long flags;
562 int err;
563
564 spin_lock_irqsave(&session->lock, flags);
565 switch (session->state) {
566 case ISCSI_SESSION_LOGGED_IN:
567 err = 0;
568 break;
569 case ISCSI_SESSION_FAILED:
570 err = DID_IMM_RETRY << 16;
571 break;
572 case ISCSI_SESSION_FREE:
573 err = DID_TRANSPORT_FAILFAST << 16;
574 break;
575 default:
576 err = DID_NO_CONNECT << 16;
577 break;
578 }
579 spin_unlock_irqrestore(&session->lock, flags);
580 return err;
581 }
582 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
583
584 static void iscsi_session_release(struct device *dev)
585 {
586 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
587 struct Scsi_Host *shost;
588
589 shost = iscsi_session_to_shost(session);
590 scsi_host_put(shost);
591 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
592 kfree(session);
593 }
594
595 static int iscsi_is_session_dev(const struct device *dev)
596 {
597 return dev->release == iscsi_session_release;
598 }
599
600 static int iscsi_iter_session_fn(struct device *dev, void *data)
601 {
602 void (* fn) (struct iscsi_cls_session *) = data;
603
604 if (!iscsi_is_session_dev(dev))
605 return 0;
606 fn(iscsi_dev_to_session(dev));
607 return 0;
608 }
609
610 void iscsi_host_for_each_session(struct Scsi_Host *shost,
611 void (*fn)(struct iscsi_cls_session *))
612 {
613 device_for_each_child(&shost->shost_gendev, fn,
614 iscsi_iter_session_fn);
615 }
616 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
617
618 /**
619 * iscsi_scan_finished - helper to report when running scans are done
620 * @shost: scsi host
621 * @time: scan run time
622 *
623 * This function can be used by drives like qla4xxx to report to the scsi
624 * layer when the scans it kicked off at module load time are done.
625 */
626 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
627 {
628 struct iscsi_cls_host *ihost = shost->shost_data;
629 /*
630 * qla4xxx will have kicked off some session unblocks before calling
631 * scsi_scan_host, so just wait for them to complete.
632 */
633 return !atomic_read(&ihost->nr_scans);
634 }
635 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
636
637 struct iscsi_scan_data {
638 unsigned int channel;
639 unsigned int id;
640 unsigned int lun;
641 };
642
643 static int iscsi_user_scan_session(struct device *dev, void *data)
644 {
645 struct iscsi_scan_data *scan_data = data;
646 struct iscsi_cls_session *session;
647 struct Scsi_Host *shost;
648 struct iscsi_cls_host *ihost;
649 unsigned long flags;
650 unsigned int id;
651
652 if (!iscsi_is_session_dev(dev))
653 return 0;
654
655 session = iscsi_dev_to_session(dev);
656
657 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
658
659 shost = iscsi_session_to_shost(session);
660 ihost = shost->shost_data;
661
662 mutex_lock(&ihost->mutex);
663 spin_lock_irqsave(&session->lock, flags);
664 if (session->state != ISCSI_SESSION_LOGGED_IN) {
665 spin_unlock_irqrestore(&session->lock, flags);
666 goto user_scan_exit;
667 }
668 id = session->target_id;
669 spin_unlock_irqrestore(&session->lock, flags);
670
671 if (id != ISCSI_MAX_TARGET) {
672 if ((scan_data->channel == SCAN_WILD_CARD ||
673 scan_data->channel == 0) &&
674 (scan_data->id == SCAN_WILD_CARD ||
675 scan_data->id == id))
676 scsi_scan_target(&session->dev, 0, id,
677 scan_data->lun, 1);
678 }
679
680 user_scan_exit:
681 mutex_unlock(&ihost->mutex);
682 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
683 return 0;
684 }
685
686 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
687 uint id, uint lun)
688 {
689 struct iscsi_scan_data scan_data;
690
691 scan_data.channel = channel;
692 scan_data.id = id;
693 scan_data.lun = lun;
694
695 return device_for_each_child(&shost->shost_gendev, &scan_data,
696 iscsi_user_scan_session);
697 }
698
699 static void iscsi_scan_session(struct work_struct *work)
700 {
701 struct iscsi_cls_session *session =
702 container_of(work, struct iscsi_cls_session, scan_work);
703 struct Scsi_Host *shost = iscsi_session_to_shost(session);
704 struct iscsi_cls_host *ihost = shost->shost_data;
705 struct iscsi_scan_data scan_data;
706
707 scan_data.channel = 0;
708 scan_data.id = SCAN_WILD_CARD;
709 scan_data.lun = SCAN_WILD_CARD;
710
711 iscsi_user_scan_session(&session->dev, &scan_data);
712 atomic_dec(&ihost->nr_scans);
713 }
714
715 /**
716 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
717 * @cmd: scsi cmd passed to scsi eh handler
718 *
719 * If the session is down this function will wait for the recovery
720 * timer to fire or for the session to be logged back in. If the
721 * recovery timer fires then FAST_IO_FAIL is returned. The caller
722 * should pass this error value to the scsi eh.
723 */
724 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
725 {
726 struct iscsi_cls_session *session =
727 starget_to_session(scsi_target(cmd->device));
728 unsigned long flags;
729 int ret = 0;
730
731 spin_lock_irqsave(&session->lock, flags);
732 while (session->state != ISCSI_SESSION_LOGGED_IN) {
733 if (session->state == ISCSI_SESSION_FREE) {
734 ret = FAST_IO_FAIL;
735 break;
736 }
737 spin_unlock_irqrestore(&session->lock, flags);
738 msleep(1000);
739 spin_lock_irqsave(&session->lock, flags);
740 }
741 spin_unlock_irqrestore(&session->lock, flags);
742 return ret;
743 }
744 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
745
746 static void session_recovery_timedout(struct work_struct *work)
747 {
748 struct iscsi_cls_session *session =
749 container_of(work, struct iscsi_cls_session,
750 recovery_work.work);
751 unsigned long flags;
752
753 iscsi_cls_session_printk(KERN_INFO, session,
754 "session recovery timed out after %d secs\n",
755 session->recovery_tmo);
756
757 spin_lock_irqsave(&session->lock, flags);
758 switch (session->state) {
759 case ISCSI_SESSION_FAILED:
760 session->state = ISCSI_SESSION_FREE;
761 break;
762 case ISCSI_SESSION_LOGGED_IN:
763 case ISCSI_SESSION_FREE:
764 /* we raced with the unblock's flush */
765 spin_unlock_irqrestore(&session->lock, flags);
766 return;
767 }
768 spin_unlock_irqrestore(&session->lock, flags);
769
770 if (session->transport->session_recovery_timedout)
771 session->transport->session_recovery_timedout(session);
772
773 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
774 scsi_target_unblock(&session->dev);
775 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
776 }
777
778 static void __iscsi_unblock_session(struct work_struct *work)
779 {
780 struct iscsi_cls_session *session =
781 container_of(work, struct iscsi_cls_session,
782 unblock_work);
783 struct Scsi_Host *shost = iscsi_session_to_shost(session);
784 struct iscsi_cls_host *ihost = shost->shost_data;
785 unsigned long flags;
786
787 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
788 /*
789 * The recovery and unblock work get run from the same workqueue,
790 * so try to cancel it if it was going to run after this unblock.
791 */
792 cancel_delayed_work(&session->recovery_work);
793 spin_lock_irqsave(&session->lock, flags);
794 session->state = ISCSI_SESSION_LOGGED_IN;
795 spin_unlock_irqrestore(&session->lock, flags);
796 /* start IO */
797 scsi_target_unblock(&session->dev);
798 /*
799 * Only do kernel scanning if the driver is properly hooked into
800 * the async scanning code (drivers like iscsi_tcp do login and
801 * scanning from userspace).
802 */
803 if (shost->hostt->scan_finished) {
804 if (scsi_queue_work(shost, &session->scan_work))
805 atomic_inc(&ihost->nr_scans);
806 }
807 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
808 }
809
810 /**
811 * iscsi_unblock_session - set a session as logged in and start IO.
812 * @session: iscsi session
813 *
814 * Mark a session as ready to accept IO.
815 */
816 void iscsi_unblock_session(struct iscsi_cls_session *session)
817 {
818 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
819 /*
820 * make sure all the events have completed before tell the driver
821 * it is safe
822 */
823 flush_workqueue(iscsi_eh_timer_workq);
824 }
825 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
826
827 static void __iscsi_block_session(struct work_struct *work)
828 {
829 struct iscsi_cls_session *session =
830 container_of(work, struct iscsi_cls_session,
831 block_work);
832 unsigned long flags;
833
834 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
835 spin_lock_irqsave(&session->lock, flags);
836 session->state = ISCSI_SESSION_FAILED;
837 spin_unlock_irqrestore(&session->lock, flags);
838 scsi_target_block(&session->dev);
839 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
840 if (session->recovery_tmo >= 0)
841 queue_delayed_work(iscsi_eh_timer_workq,
842 &session->recovery_work,
843 session->recovery_tmo * HZ);
844 }
845
846 void iscsi_block_session(struct iscsi_cls_session *session)
847 {
848 queue_work(iscsi_eh_timer_workq, &session->block_work);
849 }
850 EXPORT_SYMBOL_GPL(iscsi_block_session);
851
852 static void __iscsi_unbind_session(struct work_struct *work)
853 {
854 struct iscsi_cls_session *session =
855 container_of(work, struct iscsi_cls_session,
856 unbind_work);
857 struct Scsi_Host *shost = iscsi_session_to_shost(session);
858 struct iscsi_cls_host *ihost = shost->shost_data;
859 unsigned long flags;
860
861 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
862
863 /* Prevent new scans and make sure scanning is not in progress */
864 mutex_lock(&ihost->mutex);
865 spin_lock_irqsave(&session->lock, flags);
866 if (session->target_id == ISCSI_MAX_TARGET) {
867 spin_unlock_irqrestore(&session->lock, flags);
868 mutex_unlock(&ihost->mutex);
869 return;
870 }
871 session->target_id = ISCSI_MAX_TARGET;
872 spin_unlock_irqrestore(&session->lock, flags);
873 mutex_unlock(&ihost->mutex);
874
875 scsi_remove_target(&session->dev);
876 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
877 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
878 }
879
880 struct iscsi_cls_session *
881 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
882 int dd_size)
883 {
884 struct iscsi_cls_session *session;
885
886 session = kzalloc(sizeof(*session) + dd_size,
887 GFP_KERNEL);
888 if (!session)
889 return NULL;
890
891 session->transport = transport;
892 session->recovery_tmo = 120;
893 session->state = ISCSI_SESSION_FREE;
894 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
895 INIT_LIST_HEAD(&session->sess_list);
896 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
897 INIT_WORK(&session->block_work, __iscsi_block_session);
898 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
899 INIT_WORK(&session->scan_work, iscsi_scan_session);
900 spin_lock_init(&session->lock);
901
902 /* this is released in the dev's release function */
903 scsi_host_get(shost);
904 session->dev.parent = &shost->shost_gendev;
905 session->dev.release = iscsi_session_release;
906 device_initialize(&session->dev);
907 if (dd_size)
908 session->dd_data = &session[1];
909
910 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
911 return session;
912 }
913 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
914
915 static int iscsi_get_next_target_id(struct device *dev, void *data)
916 {
917 struct iscsi_cls_session *session;
918 unsigned long flags;
919 int err = 0;
920
921 if (!iscsi_is_session_dev(dev))
922 return 0;
923
924 session = iscsi_dev_to_session(dev);
925 spin_lock_irqsave(&session->lock, flags);
926 if (*((unsigned int *) data) == session->target_id)
927 err = -EEXIST;
928 spin_unlock_irqrestore(&session->lock, flags);
929 return err;
930 }
931
932 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
933 {
934 struct Scsi_Host *shost = iscsi_session_to_shost(session);
935 struct iscsi_cls_host *ihost;
936 unsigned long flags;
937 unsigned int id = target_id;
938 int err;
939
940 ihost = shost->shost_data;
941 session->sid = atomic_add_return(1, &iscsi_session_nr);
942
943 if (id == ISCSI_MAX_TARGET) {
944 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
945 err = device_for_each_child(&shost->shost_gendev, &id,
946 iscsi_get_next_target_id);
947 if (!err)
948 break;
949 }
950
951 if (id == ISCSI_MAX_TARGET) {
952 iscsi_cls_session_printk(KERN_ERR, session,
953 "Too many iscsi targets. Max "
954 "number of targets is %d.\n",
955 ISCSI_MAX_TARGET - 1);
956 err = -EOVERFLOW;
957 goto release_host;
958 }
959 }
960 session->target_id = id;
961
962 dev_set_name(&session->dev, "session%u", session->sid);
963 err = device_add(&session->dev);
964 if (err) {
965 iscsi_cls_session_printk(KERN_ERR, session,
966 "could not register session's dev\n");
967 goto release_host;
968 }
969 transport_register_device(&session->dev);
970
971 spin_lock_irqsave(&sesslock, flags);
972 list_add(&session->sess_list, &sesslist);
973 spin_unlock_irqrestore(&sesslock, flags);
974
975 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
976 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
977 return 0;
978
979 release_host:
980 scsi_host_put(shost);
981 return err;
982 }
983 EXPORT_SYMBOL_GPL(iscsi_add_session);
984
985 /**
986 * iscsi_create_session - create iscsi class session
987 * @shost: scsi host
988 * @transport: iscsi transport
989 * @dd_size: private driver data size
990 * @target_id: which target
991 *
992 * This can be called from a LLD or iscsi_transport.
993 */
994 struct iscsi_cls_session *
995 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
996 int dd_size, unsigned int target_id)
997 {
998 struct iscsi_cls_session *session;
999
1000 session = iscsi_alloc_session(shost, transport, dd_size);
1001 if (!session)
1002 return NULL;
1003
1004 if (iscsi_add_session(session, target_id)) {
1005 iscsi_free_session(session);
1006 return NULL;
1007 }
1008 return session;
1009 }
1010 EXPORT_SYMBOL_GPL(iscsi_create_session);
1011
1012 static void iscsi_conn_release(struct device *dev)
1013 {
1014 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1015 struct device *parent = conn->dev.parent;
1016
1017 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1018 kfree(conn);
1019 put_device(parent);
1020 }
1021
1022 static int iscsi_is_conn_dev(const struct device *dev)
1023 {
1024 return dev->release == iscsi_conn_release;
1025 }
1026
1027 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1028 {
1029 if (!iscsi_is_conn_dev(dev))
1030 return 0;
1031 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1032 }
1033
1034 void iscsi_remove_session(struct iscsi_cls_session *session)
1035 {
1036 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1037 unsigned long flags;
1038 int err;
1039
1040 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1041
1042 spin_lock_irqsave(&sesslock, flags);
1043 list_del(&session->sess_list);
1044 spin_unlock_irqrestore(&sesslock, flags);
1045
1046 /* make sure there are no blocks/unblocks queued */
1047 flush_workqueue(iscsi_eh_timer_workq);
1048 /* make sure the timedout callout is not running */
1049 if (!cancel_delayed_work(&session->recovery_work))
1050 flush_workqueue(iscsi_eh_timer_workq);
1051 /*
1052 * If we are blocked let commands flow again. The lld or iscsi
1053 * layer should set up the queuecommand to fail commands.
1054 * We assume that LLD will not be calling block/unblock while
1055 * removing the session.
1056 */
1057 spin_lock_irqsave(&session->lock, flags);
1058 session->state = ISCSI_SESSION_FREE;
1059 spin_unlock_irqrestore(&session->lock, flags);
1060
1061 scsi_target_unblock(&session->dev);
1062 /* flush running scans then delete devices */
1063 scsi_flush_work(shost);
1064 __iscsi_unbind_session(&session->unbind_work);
1065
1066 /* hw iscsi may not have removed all connections from session */
1067 err = device_for_each_child(&session->dev, NULL,
1068 iscsi_iter_destroy_conn_fn);
1069 if (err)
1070 iscsi_cls_session_printk(KERN_ERR, session,
1071 "Could not delete all connections "
1072 "for session. Error %d.\n", err);
1073
1074 transport_unregister_device(&session->dev);
1075
1076 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1077 device_del(&session->dev);
1078 }
1079 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1080
1081 void iscsi_free_session(struct iscsi_cls_session *session)
1082 {
1083 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1084 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1085 put_device(&session->dev);
1086 }
1087 EXPORT_SYMBOL_GPL(iscsi_free_session);
1088
1089 /**
1090 * iscsi_destroy_session - destroy iscsi session
1091 * @session: iscsi_session
1092 *
1093 * Can be called by a LLD or iscsi_transport. There must not be
1094 * any running connections.
1095 */
1096 int iscsi_destroy_session(struct iscsi_cls_session *session)
1097 {
1098 iscsi_remove_session(session);
1099 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1100 iscsi_free_session(session);
1101 return 0;
1102 }
1103 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1104
1105 /**
1106 * iscsi_create_conn - create iscsi class connection
1107 * @session: iscsi cls session
1108 * @dd_size: private driver data size
1109 * @cid: connection id
1110 *
1111 * This can be called from a LLD or iscsi_transport. The connection
1112 * is child of the session so cid must be unique for all connections
1113 * on the session.
1114 *
1115 * Since we do not support MCS, cid will normally be zero. In some cases
1116 * for software iscsi we could be trying to preallocate a connection struct
1117 * in which case there could be two connection structs and cid would be
1118 * non-zero.
1119 */
1120 struct iscsi_cls_conn *
1121 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1122 {
1123 struct iscsi_transport *transport = session->transport;
1124 struct iscsi_cls_conn *conn;
1125 unsigned long flags;
1126 int err;
1127
1128 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1129 if (!conn)
1130 return NULL;
1131 if (dd_size)
1132 conn->dd_data = &conn[1];
1133
1134 mutex_init(&conn->ep_mutex);
1135 INIT_LIST_HEAD(&conn->conn_list);
1136 conn->transport = transport;
1137 conn->cid = cid;
1138
1139 /* this is released in the dev's release function */
1140 if (!get_device(&session->dev))
1141 goto free_conn;
1142
1143 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1144 conn->dev.parent = &session->dev;
1145 conn->dev.release = iscsi_conn_release;
1146 err = device_register(&conn->dev);
1147 if (err) {
1148 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1149 "register connection's dev\n");
1150 goto release_parent_ref;
1151 }
1152 transport_register_device(&conn->dev);
1153
1154 spin_lock_irqsave(&connlock, flags);
1155 list_add(&conn->conn_list, &connlist);
1156 spin_unlock_irqrestore(&connlock, flags);
1157
1158 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1159 return conn;
1160
1161 release_parent_ref:
1162 put_device(&session->dev);
1163 free_conn:
1164 kfree(conn);
1165 return NULL;
1166 }
1167
1168 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1169
1170 /**
1171 * iscsi_destroy_conn - destroy iscsi class connection
1172 * @conn: iscsi cls session
1173 *
1174 * This can be called from a LLD or iscsi_transport.
1175 */
1176 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1177 {
1178 unsigned long flags;
1179
1180 spin_lock_irqsave(&connlock, flags);
1181 list_del(&conn->conn_list);
1182 spin_unlock_irqrestore(&connlock, flags);
1183
1184 transport_unregister_device(&conn->dev);
1185 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1186 device_unregister(&conn->dev);
1187 return 0;
1188 }
1189 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1190
1191 /*
1192 * iscsi interface functions
1193 */
1194 static struct iscsi_internal *
1195 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1196 {
1197 struct iscsi_internal *priv;
1198 unsigned long flags;
1199
1200 spin_lock_irqsave(&iscsi_transport_lock, flags);
1201 list_for_each_entry(priv, &iscsi_transports, list) {
1202 if (tt == priv->iscsi_transport) {
1203 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1204 return priv;
1205 }
1206 }
1207 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1208 return NULL;
1209 }
1210
1211 static int
1212 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1213 {
1214 return nlmsg_multicast(nls, skb, 0, group, gfp);
1215 }
1216
1217 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1218 char *data, uint32_t data_size)
1219 {
1220 struct nlmsghdr *nlh;
1221 struct sk_buff *skb;
1222 struct iscsi_uevent *ev;
1223 char *pdu;
1224 struct iscsi_internal *priv;
1225 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1226 data_size);
1227
1228 priv = iscsi_if_transport_lookup(conn->transport);
1229 if (!priv)
1230 return -EINVAL;
1231
1232 skb = alloc_skb(len, GFP_ATOMIC);
1233 if (!skb) {
1234 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1235 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1236 "control PDU: OOM\n");
1237 return -ENOMEM;
1238 }
1239
1240 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1241 ev = NLMSG_DATA(nlh);
1242 memset(ev, 0, sizeof(*ev));
1243 ev->transport_handle = iscsi_handle(conn->transport);
1244 ev->type = ISCSI_KEVENT_RECV_PDU;
1245 ev->r.recv_req.cid = conn->cid;
1246 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1247 pdu = (char*)ev + sizeof(*ev);
1248 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1249 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1250
1251 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1252 }
1253 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1254
1255 int iscsi_offload_mesg(struct Scsi_Host *shost,
1256 struct iscsi_transport *transport, uint32_t type,
1257 char *data, uint16_t data_size)
1258 {
1259 struct nlmsghdr *nlh;
1260 struct sk_buff *skb;
1261 struct iscsi_uevent *ev;
1262 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1263
1264 skb = alloc_skb(len, GFP_ATOMIC);
1265 if (!skb) {
1266 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1267 return -ENOMEM;
1268 }
1269
1270 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1271 ev = NLMSG_DATA(nlh);
1272 memset(ev, 0, sizeof(*ev));
1273 ev->type = type;
1274 ev->transport_handle = iscsi_handle(transport);
1275 switch (type) {
1276 case ISCSI_KEVENT_PATH_REQ:
1277 ev->r.req_path.host_no = shost->host_no;
1278 break;
1279 case ISCSI_KEVENT_IF_DOWN:
1280 ev->r.notify_if_down.host_no = shost->host_no;
1281 break;
1282 }
1283
1284 memcpy((char *)ev + sizeof(*ev), data, data_size);
1285
1286 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1287 }
1288 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1289
1290 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1291 {
1292 struct nlmsghdr *nlh;
1293 struct sk_buff *skb;
1294 struct iscsi_uevent *ev;
1295 struct iscsi_internal *priv;
1296 int len = NLMSG_SPACE(sizeof(*ev));
1297
1298 priv = iscsi_if_transport_lookup(conn->transport);
1299 if (!priv)
1300 return;
1301
1302 skb = alloc_skb(len, GFP_ATOMIC);
1303 if (!skb) {
1304 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1305 "conn error (%d)\n", error);
1306 return;
1307 }
1308
1309 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1310 ev = NLMSG_DATA(nlh);
1311 ev->transport_handle = iscsi_handle(conn->transport);
1312 ev->type = ISCSI_KEVENT_CONN_ERROR;
1313 ev->r.connerror.error = error;
1314 ev->r.connerror.cid = conn->cid;
1315 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1316
1317 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1318
1319 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1320 error);
1321 }
1322 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1323
1324 static int
1325 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1326 void *payload, int size)
1327 {
1328 struct sk_buff *skb;
1329 struct nlmsghdr *nlh;
1330 int len = NLMSG_SPACE(size);
1331 int flags = multi ? NLM_F_MULTI : 0;
1332 int t = done ? NLMSG_DONE : type;
1333
1334 skb = alloc_skb(len, GFP_ATOMIC);
1335 if (!skb) {
1336 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1337 return -ENOMEM;
1338 }
1339
1340 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1341 nlh->nlmsg_flags = flags;
1342 memcpy(NLMSG_DATA(nlh), payload, size);
1343 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1344 }
1345
1346 static int
1347 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1348 {
1349 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1350 struct iscsi_stats *stats;
1351 struct sk_buff *skbstat;
1352 struct iscsi_cls_conn *conn;
1353 struct nlmsghdr *nlhstat;
1354 struct iscsi_uevent *evstat;
1355 struct iscsi_internal *priv;
1356 int len = NLMSG_SPACE(sizeof(*ev) +
1357 sizeof(struct iscsi_stats) +
1358 sizeof(struct iscsi_stats_custom) *
1359 ISCSI_STATS_CUSTOM_MAX);
1360 int err = 0;
1361
1362 priv = iscsi_if_transport_lookup(transport);
1363 if (!priv)
1364 return -EINVAL;
1365
1366 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1367 if (!conn)
1368 return -EEXIST;
1369
1370 do {
1371 int actual_size;
1372
1373 skbstat = alloc_skb(len, GFP_ATOMIC);
1374 if (!skbstat) {
1375 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1376 "deliver stats: OOM\n");
1377 return -ENOMEM;
1378 }
1379
1380 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1381 (len - sizeof(*nlhstat)), 0);
1382 evstat = NLMSG_DATA(nlhstat);
1383 memset(evstat, 0, sizeof(*evstat));
1384 evstat->transport_handle = iscsi_handle(conn->transport);
1385 evstat->type = nlh->nlmsg_type;
1386 evstat->u.get_stats.cid =
1387 ev->u.get_stats.cid;
1388 evstat->u.get_stats.sid =
1389 ev->u.get_stats.sid;
1390 stats = (struct iscsi_stats *)
1391 ((char*)evstat + sizeof(*evstat));
1392 memset(stats, 0, sizeof(*stats));
1393
1394 transport->get_stats(conn, stats);
1395 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1396 sizeof(struct iscsi_stats) +
1397 sizeof(struct iscsi_stats_custom) *
1398 stats->custom_length);
1399 actual_size -= sizeof(*nlhstat);
1400 actual_size = NLMSG_LENGTH(actual_size);
1401 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1402 nlhstat->nlmsg_len = actual_size;
1403
1404 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1405 GFP_ATOMIC);
1406 } while (err < 0 && err != -ECONNREFUSED);
1407
1408 return err;
1409 }
1410
1411 /**
1412 * iscsi_session_event - send session destr. completion event
1413 * @session: iscsi class session
1414 * @event: type of event
1415 */
1416 int iscsi_session_event(struct iscsi_cls_session *session,
1417 enum iscsi_uevent_e event)
1418 {
1419 struct iscsi_internal *priv;
1420 struct Scsi_Host *shost;
1421 struct iscsi_uevent *ev;
1422 struct sk_buff *skb;
1423 struct nlmsghdr *nlh;
1424 int rc, len = NLMSG_SPACE(sizeof(*ev));
1425
1426 priv = iscsi_if_transport_lookup(session->transport);
1427 if (!priv)
1428 return -EINVAL;
1429 shost = iscsi_session_to_shost(session);
1430
1431 skb = alloc_skb(len, GFP_KERNEL);
1432 if (!skb) {
1433 iscsi_cls_session_printk(KERN_ERR, session,
1434 "Cannot notify userspace of session "
1435 "event %u\n", event);
1436 return -ENOMEM;
1437 }
1438
1439 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1440 ev = NLMSG_DATA(nlh);
1441 ev->transport_handle = iscsi_handle(session->transport);
1442
1443 ev->type = event;
1444 switch (event) {
1445 case ISCSI_KEVENT_DESTROY_SESSION:
1446 ev->r.d_session.host_no = shost->host_no;
1447 ev->r.d_session.sid = session->sid;
1448 break;
1449 case ISCSI_KEVENT_CREATE_SESSION:
1450 ev->r.c_session_ret.host_no = shost->host_no;
1451 ev->r.c_session_ret.sid = session->sid;
1452 break;
1453 case ISCSI_KEVENT_UNBIND_SESSION:
1454 ev->r.unbind_session.host_no = shost->host_no;
1455 ev->r.unbind_session.sid = session->sid;
1456 break;
1457 default:
1458 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1459 "%u.\n", event);
1460 kfree_skb(skb);
1461 return -EINVAL;
1462 }
1463
1464 /*
1465 * this will occur if the daemon is not up, so we just warn
1466 * the user and when the daemon is restarted it will handle it
1467 */
1468 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1469 if (rc == -ESRCH)
1470 iscsi_cls_session_printk(KERN_ERR, session,
1471 "Cannot notify userspace of session "
1472 "event %u. Check iscsi daemon\n",
1473 event);
1474
1475 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1476 event, rc);
1477 return rc;
1478 }
1479 EXPORT_SYMBOL_GPL(iscsi_session_event);
1480
1481 static int
1482 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1483 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1484 uint16_t cmds_max, uint16_t queue_depth)
1485 {
1486 struct iscsi_transport *transport = priv->iscsi_transport;
1487 struct iscsi_cls_session *session;
1488 struct Scsi_Host *shost;
1489
1490 session = transport->create_session(ep, cmds_max, queue_depth,
1491 initial_cmdsn);
1492 if (!session)
1493 return -ENOMEM;
1494
1495 shost = iscsi_session_to_shost(session);
1496 ev->r.c_session_ret.host_no = shost->host_no;
1497 ev->r.c_session_ret.sid = session->sid;
1498 ISCSI_DBG_TRANS_SESSION(session,
1499 "Completed creating transport session\n");
1500 return 0;
1501 }
1502
1503 static int
1504 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1505 {
1506 struct iscsi_cls_conn *conn;
1507 struct iscsi_cls_session *session;
1508
1509 session = iscsi_session_lookup(ev->u.c_conn.sid);
1510 if (!session) {
1511 printk(KERN_ERR "iscsi: invalid session %d.\n",
1512 ev->u.c_conn.sid);
1513 return -EINVAL;
1514 }
1515
1516 conn = transport->create_conn(session, ev->u.c_conn.cid);
1517 if (!conn) {
1518 iscsi_cls_session_printk(KERN_ERR, session,
1519 "couldn't create a new connection.");
1520 return -ENOMEM;
1521 }
1522
1523 ev->r.c_conn_ret.sid = session->sid;
1524 ev->r.c_conn_ret.cid = conn->cid;
1525
1526 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1527 return 0;
1528 }
1529
1530 static int
1531 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1532 {
1533 struct iscsi_cls_conn *conn;
1534
1535 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1536 if (!conn)
1537 return -EINVAL;
1538
1539 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1540 if (transport->destroy_conn)
1541 transport->destroy_conn(conn);
1542
1543 return 0;
1544 }
1545
1546 static int
1547 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1548 {
1549 char *data = (char*)ev + sizeof(*ev);
1550 struct iscsi_cls_conn *conn;
1551 struct iscsi_cls_session *session;
1552 int err = 0, value = 0;
1553
1554 session = iscsi_session_lookup(ev->u.set_param.sid);
1555 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1556 if (!conn || !session)
1557 return -EINVAL;
1558
1559 switch (ev->u.set_param.param) {
1560 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1561 sscanf(data, "%d", &value);
1562 session->recovery_tmo = value;
1563 break;
1564 default:
1565 err = transport->set_param(conn, ev->u.set_param.param,
1566 data, ev->u.set_param.len);
1567 }
1568
1569 return err;
1570 }
1571
1572 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1573 struct iscsi_uevent *ev, int msg_type)
1574 {
1575 struct iscsi_endpoint *ep;
1576 struct sockaddr *dst_addr;
1577 struct Scsi_Host *shost = NULL;
1578 int non_blocking, err = 0;
1579
1580 if (!transport->ep_connect)
1581 return -EINVAL;
1582
1583 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1584 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1585 if (!shost) {
1586 printk(KERN_ERR "ep connect failed. Could not find "
1587 "host no %u\n",
1588 ev->u.ep_connect_through_host.host_no);
1589 return -ENODEV;
1590 }
1591 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1592 } else
1593 non_blocking = ev->u.ep_connect.non_blocking;
1594
1595 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1596 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1597 if (IS_ERR(ep)) {
1598 err = PTR_ERR(ep);
1599 goto release_host;
1600 }
1601
1602 ev->r.ep_connect_ret.handle = ep->id;
1603 release_host:
1604 if (shost)
1605 scsi_host_put(shost);
1606 return err;
1607 }
1608
1609 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1610 u64 ep_handle)
1611 {
1612 struct iscsi_cls_conn *conn;
1613 struct iscsi_endpoint *ep;
1614
1615 if (!transport->ep_disconnect)
1616 return -EINVAL;
1617
1618 ep = iscsi_lookup_endpoint(ep_handle);
1619 if (!ep)
1620 return -EINVAL;
1621 conn = ep->conn;
1622 if (conn) {
1623 mutex_lock(&conn->ep_mutex);
1624 conn->ep = NULL;
1625 mutex_unlock(&conn->ep_mutex);
1626 }
1627
1628 transport->ep_disconnect(ep);
1629 return 0;
1630 }
1631
1632 static int
1633 iscsi_if_transport_ep(struct iscsi_transport *transport,
1634 struct iscsi_uevent *ev, int msg_type)
1635 {
1636 struct iscsi_endpoint *ep;
1637 int rc = 0;
1638
1639 switch (msg_type) {
1640 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1641 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1642 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1643 break;
1644 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1645 if (!transport->ep_poll)
1646 return -EINVAL;
1647
1648 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1649 if (!ep)
1650 return -EINVAL;
1651
1652 ev->r.retcode = transport->ep_poll(ep,
1653 ev->u.ep_poll.timeout_ms);
1654 break;
1655 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1656 rc = iscsi_if_ep_disconnect(transport,
1657 ev->u.ep_disconnect.ep_handle);
1658 break;
1659 }
1660 return rc;
1661 }
1662
1663 static int
1664 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1665 struct iscsi_uevent *ev)
1666 {
1667 struct Scsi_Host *shost;
1668 struct sockaddr *dst_addr;
1669 int err;
1670
1671 if (!transport->tgt_dscvr)
1672 return -EINVAL;
1673
1674 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1675 if (!shost) {
1676 printk(KERN_ERR "target discovery could not find host no %u\n",
1677 ev->u.tgt_dscvr.host_no);
1678 return -ENODEV;
1679 }
1680
1681
1682 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1683 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1684 ev->u.tgt_dscvr.enable, dst_addr);
1685 scsi_host_put(shost);
1686 return err;
1687 }
1688
1689 static int
1690 iscsi_set_host_param(struct iscsi_transport *transport,
1691 struct iscsi_uevent *ev)
1692 {
1693 char *data = (char*)ev + sizeof(*ev);
1694 struct Scsi_Host *shost;
1695 int err;
1696
1697 if (!transport->set_host_param)
1698 return -ENOSYS;
1699
1700 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1701 if (!shost) {
1702 printk(KERN_ERR "set_host_param could not find host no %u\n",
1703 ev->u.set_host_param.host_no);
1704 return -ENODEV;
1705 }
1706
1707 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1708 data, ev->u.set_host_param.len);
1709 scsi_host_put(shost);
1710 return err;
1711 }
1712
1713 static int
1714 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1715 {
1716 struct Scsi_Host *shost;
1717 struct iscsi_path *params;
1718 int err;
1719
1720 if (!transport->set_path)
1721 return -ENOSYS;
1722
1723 shost = scsi_host_lookup(ev->u.set_path.host_no);
1724 if (!shost) {
1725 printk(KERN_ERR "set path could not find host no %u\n",
1726 ev->u.set_path.host_no);
1727 return -ENODEV;
1728 }
1729
1730 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1731 err = transport->set_path(shost, params);
1732
1733 scsi_host_put(shost);
1734 return err;
1735 }
1736
1737 static int
1738 iscsi_set_iface_params(struct iscsi_transport *transport,
1739 struct iscsi_uevent *ev)
1740 {
1741 char *data = (char *)ev + sizeof(*ev);
1742 struct Scsi_Host *shost;
1743 int err;
1744
1745 if (!transport->set_iface_param)
1746 return -ENOSYS;
1747
1748 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1749 if (!shost) {
1750 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1751 ev->u.set_iface_params.host_no);
1752 return -ENODEV;
1753 }
1754
1755 err = transport->set_iface_param(shost, data,
1756 ev->u.set_iface_params.count);
1757 scsi_host_put(shost);
1758 return err;
1759 }
1760
1761 static int
1762 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1763 {
1764 int err = 0;
1765 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1766 struct iscsi_transport *transport = NULL;
1767 struct iscsi_internal *priv;
1768 struct iscsi_cls_session *session;
1769 struct iscsi_cls_conn *conn;
1770 struct iscsi_endpoint *ep = NULL;
1771
1772 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1773 *group = ISCSI_NL_GRP_UIP;
1774 else
1775 *group = ISCSI_NL_GRP_ISCSID;
1776
1777 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1778 if (!priv)
1779 return -EINVAL;
1780 transport = priv->iscsi_transport;
1781
1782 if (!try_module_get(transport->owner))
1783 return -EINVAL;
1784
1785 switch (nlh->nlmsg_type) {
1786 case ISCSI_UEVENT_CREATE_SESSION:
1787 err = iscsi_if_create_session(priv, ep, ev,
1788 ev->u.c_session.initial_cmdsn,
1789 ev->u.c_session.cmds_max,
1790 ev->u.c_session.queue_depth);
1791 break;
1792 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1793 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1794 if (!ep) {
1795 err = -EINVAL;
1796 break;
1797 }
1798
1799 err = iscsi_if_create_session(priv, ep, ev,
1800 ev->u.c_bound_session.initial_cmdsn,
1801 ev->u.c_bound_session.cmds_max,
1802 ev->u.c_bound_session.queue_depth);
1803 break;
1804 case ISCSI_UEVENT_DESTROY_SESSION:
1805 session = iscsi_session_lookup(ev->u.d_session.sid);
1806 if (session)
1807 transport->destroy_session(session);
1808 else
1809 err = -EINVAL;
1810 break;
1811 case ISCSI_UEVENT_UNBIND_SESSION:
1812 session = iscsi_session_lookup(ev->u.d_session.sid);
1813 if (session)
1814 scsi_queue_work(iscsi_session_to_shost(session),
1815 &session->unbind_work);
1816 else
1817 err = -EINVAL;
1818 break;
1819 case ISCSI_UEVENT_CREATE_CONN:
1820 err = iscsi_if_create_conn(transport, ev);
1821 break;
1822 case ISCSI_UEVENT_DESTROY_CONN:
1823 err = iscsi_if_destroy_conn(transport, ev);
1824 break;
1825 case ISCSI_UEVENT_BIND_CONN:
1826 session = iscsi_session_lookup(ev->u.b_conn.sid);
1827 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1828
1829 if (conn && conn->ep)
1830 iscsi_if_ep_disconnect(transport, conn->ep->id);
1831
1832 if (!session || !conn) {
1833 err = -EINVAL;
1834 break;
1835 }
1836
1837 ev->r.retcode = transport->bind_conn(session, conn,
1838 ev->u.b_conn.transport_eph,
1839 ev->u.b_conn.is_leading);
1840 if (ev->r.retcode || !transport->ep_connect)
1841 break;
1842
1843 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1844 if (ep) {
1845 ep->conn = conn;
1846
1847 mutex_lock(&conn->ep_mutex);
1848 conn->ep = ep;
1849 mutex_unlock(&conn->ep_mutex);
1850 } else
1851 iscsi_cls_conn_printk(KERN_ERR, conn,
1852 "Could not set ep conn "
1853 "binding\n");
1854 break;
1855 case ISCSI_UEVENT_SET_PARAM:
1856 err = iscsi_set_param(transport, ev);
1857 break;
1858 case ISCSI_UEVENT_START_CONN:
1859 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1860 if (conn)
1861 ev->r.retcode = transport->start_conn(conn);
1862 else
1863 err = -EINVAL;
1864 break;
1865 case ISCSI_UEVENT_STOP_CONN:
1866 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1867 if (conn)
1868 transport->stop_conn(conn, ev->u.stop_conn.flag);
1869 else
1870 err = -EINVAL;
1871 break;
1872 case ISCSI_UEVENT_SEND_PDU:
1873 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1874 if (conn)
1875 ev->r.retcode = transport->send_pdu(conn,
1876 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1877 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1878 ev->u.send_pdu.data_size);
1879 else
1880 err = -EINVAL;
1881 break;
1882 case ISCSI_UEVENT_GET_STATS:
1883 err = iscsi_if_get_stats(transport, nlh);
1884 break;
1885 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1886 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1887 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1888 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1889 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1890 break;
1891 case ISCSI_UEVENT_TGT_DSCVR:
1892 err = iscsi_tgt_dscvr(transport, ev);
1893 break;
1894 case ISCSI_UEVENT_SET_HOST_PARAM:
1895 err = iscsi_set_host_param(transport, ev);
1896 break;
1897 case ISCSI_UEVENT_PATH_UPDATE:
1898 err = iscsi_set_path(transport, ev);
1899 break;
1900 case ISCSI_UEVENT_SET_IFACE_PARAMS:
1901 err = iscsi_set_iface_params(transport, ev);
1902 break;
1903 default:
1904 err = -ENOSYS;
1905 break;
1906 }
1907
1908 module_put(transport->owner);
1909 return err;
1910 }
1911
1912 /*
1913 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1914 * Malformed skbs with wrong lengths or invalid creds are not processed.
1915 */
1916 static void
1917 iscsi_if_rx(struct sk_buff *skb)
1918 {
1919 mutex_lock(&rx_queue_mutex);
1920 while (skb->len >= NLMSG_SPACE(0)) {
1921 int err;
1922 uint32_t rlen;
1923 struct nlmsghdr *nlh;
1924 struct iscsi_uevent *ev;
1925 uint32_t group;
1926
1927 nlh = nlmsg_hdr(skb);
1928 if (nlh->nlmsg_len < sizeof(*nlh) ||
1929 skb->len < nlh->nlmsg_len) {
1930 break;
1931 }
1932
1933 ev = NLMSG_DATA(nlh);
1934 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1935 if (rlen > skb->len)
1936 rlen = skb->len;
1937
1938 err = iscsi_if_recv_msg(skb, nlh, &group);
1939 if (err) {
1940 ev->type = ISCSI_KEVENT_IF_ERROR;
1941 ev->iferror = err;
1942 }
1943 do {
1944 /*
1945 * special case for GET_STATS:
1946 * on success - sending reply and stats from
1947 * inside of if_recv_msg(),
1948 * on error - fall through.
1949 */
1950 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1951 break;
1952 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1953 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1954 } while (err < 0 && err != -ECONNREFUSED);
1955 skb_pull(skb, rlen);
1956 }
1957 mutex_unlock(&rx_queue_mutex);
1958 }
1959
1960 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1961 struct device_attribute dev_attr_##_prefix##_##_name = \
1962 __ATTR(_name,_mode,_show,_store)
1963
1964 /*
1965 * iSCSI connection attrs
1966 */
1967 #define iscsi_conn_attr_show(param) \
1968 static ssize_t \
1969 show_conn_param_##param(struct device *dev, \
1970 struct device_attribute *attr, char *buf) \
1971 { \
1972 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1973 struct iscsi_transport *t = conn->transport; \
1974 return t->get_conn_param(conn, param, buf); \
1975 }
1976
1977 #define iscsi_conn_attr(field, param) \
1978 iscsi_conn_attr_show(param) \
1979 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1980 NULL);
1981
1982 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1983 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1984 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1985 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1986 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1987 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1988 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1989 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1990 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1991 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1992 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1993
1994 #define iscsi_conn_ep_attr_show(param) \
1995 static ssize_t show_conn_ep_param_##param(struct device *dev, \
1996 struct device_attribute *attr,\
1997 char *buf) \
1998 { \
1999 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2000 struct iscsi_transport *t = conn->transport; \
2001 struct iscsi_endpoint *ep; \
2002 ssize_t rc; \
2003 \
2004 /* \
2005 * Need to make sure ep_disconnect does not free the LLD's \
2006 * interconnect resources while we are trying to read them. \
2007 */ \
2008 mutex_lock(&conn->ep_mutex); \
2009 ep = conn->ep; \
2010 if (!ep && t->ep_connect) { \
2011 mutex_unlock(&conn->ep_mutex); \
2012 return -ENOTCONN; \
2013 } \
2014 \
2015 if (ep) \
2016 rc = t->get_ep_param(ep, param, buf); \
2017 else \
2018 rc = t->get_conn_param(conn, param, buf); \
2019 mutex_unlock(&conn->ep_mutex); \
2020 return rc; \
2021 }
2022
2023 #define iscsi_conn_ep_attr(field, param) \
2024 iscsi_conn_ep_attr_show(param) \
2025 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2026 show_conn_ep_param_##param, NULL);
2027
2028 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2029 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2030
2031 static struct attribute *iscsi_conn_attrs[] = {
2032 &dev_attr_conn_max_recv_dlength.attr,
2033 &dev_attr_conn_max_xmit_dlength.attr,
2034 &dev_attr_conn_header_digest.attr,
2035 &dev_attr_conn_data_digest.attr,
2036 &dev_attr_conn_ifmarker.attr,
2037 &dev_attr_conn_ofmarker.attr,
2038 &dev_attr_conn_address.attr,
2039 &dev_attr_conn_port.attr,
2040 &dev_attr_conn_exp_statsn.attr,
2041 &dev_attr_conn_persistent_address.attr,
2042 &dev_attr_conn_persistent_port.attr,
2043 &dev_attr_conn_ping_tmo.attr,
2044 &dev_attr_conn_recv_tmo.attr,
2045 NULL,
2046 };
2047
2048 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2049 struct attribute *attr, int i)
2050 {
2051 struct device *cdev = container_of(kobj, struct device, kobj);
2052 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2053 struct iscsi_transport *t = conn->transport;
2054 int param;
2055
2056 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2057 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2058 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2059 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2060 else if (attr == &dev_attr_conn_header_digest.attr)
2061 param = ISCSI_PARAM_HDRDGST_EN;
2062 else if (attr == &dev_attr_conn_data_digest.attr)
2063 param = ISCSI_PARAM_DATADGST_EN;
2064 else if (attr == &dev_attr_conn_ifmarker.attr)
2065 param = ISCSI_PARAM_IFMARKER_EN;
2066 else if (attr == &dev_attr_conn_ofmarker.attr)
2067 param = ISCSI_PARAM_OFMARKER_EN;
2068 else if (attr == &dev_attr_conn_address.attr)
2069 param = ISCSI_PARAM_CONN_ADDRESS;
2070 else if (attr == &dev_attr_conn_port.attr)
2071 param = ISCSI_PARAM_CONN_PORT;
2072 else if (attr == &dev_attr_conn_exp_statsn.attr)
2073 param = ISCSI_PARAM_EXP_STATSN;
2074 else if (attr == &dev_attr_conn_persistent_address.attr)
2075 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2076 else if (attr == &dev_attr_conn_persistent_port.attr)
2077 param = ISCSI_PARAM_PERSISTENT_PORT;
2078 else if (attr == &dev_attr_conn_ping_tmo.attr)
2079 param = ISCSI_PARAM_PING_TMO;
2080 else if (attr == &dev_attr_conn_recv_tmo.attr)
2081 param = ISCSI_PARAM_RECV_TMO;
2082 else {
2083 WARN_ONCE(1, "Invalid conn attr");
2084 return 0;
2085 }
2086
2087 return t->attr_is_visible(ISCSI_PARAM, param);
2088 }
2089
2090 static struct attribute_group iscsi_conn_group = {
2091 .attrs = iscsi_conn_attrs,
2092 .is_visible = iscsi_conn_attr_is_visible,
2093 };
2094
2095 /*
2096 * iSCSI session attrs
2097 */
2098 #define iscsi_session_attr_show(param, perm) \
2099 static ssize_t \
2100 show_session_param_##param(struct device *dev, \
2101 struct device_attribute *attr, char *buf) \
2102 { \
2103 struct iscsi_cls_session *session = \
2104 iscsi_dev_to_session(dev->parent); \
2105 struct iscsi_transport *t = session->transport; \
2106 \
2107 if (perm && !capable(CAP_SYS_ADMIN)) \
2108 return -EACCES; \
2109 return t->get_session_param(session, param, buf); \
2110 }
2111
2112 #define iscsi_session_attr(field, param, perm) \
2113 iscsi_session_attr_show(param, perm) \
2114 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2115 NULL);
2116 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2117 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2118 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2119 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2120 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2121 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2122 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2123 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2124 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2125 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2126 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2127 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2128 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2129 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2130 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2131 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2132 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2133 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2134 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2135 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2136 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2137
2138 static ssize_t
2139 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2140 char *buf)
2141 {
2142 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2143 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2144 }
2145 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2146 NULL);
2147
2148 #define iscsi_priv_session_attr_show(field, format) \
2149 static ssize_t \
2150 show_priv_session_##field(struct device *dev, \
2151 struct device_attribute *attr, char *buf) \
2152 { \
2153 struct iscsi_cls_session *session = \
2154 iscsi_dev_to_session(dev->parent); \
2155 if (session->field == -1) \
2156 return sprintf(buf, "off\n"); \
2157 return sprintf(buf, format"\n", session->field); \
2158 }
2159
2160 #define iscsi_priv_session_attr_store(field) \
2161 static ssize_t \
2162 store_priv_session_##field(struct device *dev, \
2163 struct device_attribute *attr, \
2164 const char *buf, size_t count) \
2165 { \
2166 int val; \
2167 char *cp; \
2168 struct iscsi_cls_session *session = \
2169 iscsi_dev_to_session(dev->parent); \
2170 if ((session->state == ISCSI_SESSION_FREE) || \
2171 (session->state == ISCSI_SESSION_FAILED)) \
2172 return -EBUSY; \
2173 if (strncmp(buf, "off", 3) == 0) \
2174 session->field = -1; \
2175 else { \
2176 val = simple_strtoul(buf, &cp, 0); \
2177 if (*cp != '\0' && *cp != '\n') \
2178 return -EINVAL; \
2179 session->field = val; \
2180 } \
2181 return count; \
2182 }
2183
2184 #define iscsi_priv_session_rw_attr(field, format) \
2185 iscsi_priv_session_attr_show(field, format) \
2186 iscsi_priv_session_attr_store(field) \
2187 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
2188 show_priv_session_##field, \
2189 store_priv_session_##field)
2190 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2191
2192 static struct attribute *iscsi_session_attrs[] = {
2193 &dev_attr_sess_initial_r2t.attr,
2194 &dev_attr_sess_max_outstanding_r2t.attr,
2195 &dev_attr_sess_immediate_data.attr,
2196 &dev_attr_sess_first_burst_len.attr,
2197 &dev_attr_sess_max_burst_len.attr,
2198 &dev_attr_sess_data_pdu_in_order.attr,
2199 &dev_attr_sess_data_seq_in_order.attr,
2200 &dev_attr_sess_erl.attr,
2201 &dev_attr_sess_targetname.attr,
2202 &dev_attr_sess_tpgt.attr,
2203 &dev_attr_sess_password.attr,
2204 &dev_attr_sess_password_in.attr,
2205 &dev_attr_sess_username.attr,
2206 &dev_attr_sess_username_in.attr,
2207 &dev_attr_sess_fast_abort.attr,
2208 &dev_attr_sess_abort_tmo.attr,
2209 &dev_attr_sess_lu_reset_tmo.attr,
2210 &dev_attr_sess_tgt_reset_tmo.attr,
2211 &dev_attr_sess_ifacename.attr,
2212 &dev_attr_sess_initiatorname.attr,
2213 &dev_attr_sess_targetalias.attr,
2214 &dev_attr_priv_sess_recovery_tmo.attr,
2215 &dev_attr_priv_sess_state.attr,
2216 NULL,
2217 };
2218
2219 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2220 struct attribute *attr, int i)
2221 {
2222 struct device *cdev = container_of(kobj, struct device, kobj);
2223 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2224 struct iscsi_transport *t = session->transport;
2225 int param;
2226
2227 if (attr == &dev_attr_sess_initial_r2t.attr)
2228 param = ISCSI_PARAM_INITIAL_R2T_EN;
2229 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2230 param = ISCSI_PARAM_MAX_R2T;
2231 else if (attr == &dev_attr_sess_immediate_data.attr)
2232 param = ISCSI_PARAM_IMM_DATA_EN;
2233 else if (attr == &dev_attr_sess_first_burst_len.attr)
2234 param = ISCSI_PARAM_FIRST_BURST;
2235 else if (attr == &dev_attr_sess_max_burst_len.attr)
2236 param = ISCSI_PARAM_MAX_BURST;
2237 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2238 param = ISCSI_PARAM_PDU_INORDER_EN;
2239 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2240 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2241 else if (attr == &dev_attr_sess_erl.attr)
2242 param = ISCSI_PARAM_ERL;
2243 else if (attr == &dev_attr_sess_targetname.attr)
2244 param = ISCSI_PARAM_TARGET_NAME;
2245 else if (attr == &dev_attr_sess_tpgt.attr)
2246 param = ISCSI_PARAM_TPGT;
2247 else if (attr == &dev_attr_sess_password.attr)
2248 param = ISCSI_PARAM_USERNAME;
2249 else if (attr == &dev_attr_sess_password_in.attr)
2250 param = ISCSI_PARAM_USERNAME_IN;
2251 else if (attr == &dev_attr_sess_username.attr)
2252 param = ISCSI_PARAM_PASSWORD;
2253 else if (attr == &dev_attr_sess_username_in.attr)
2254 param = ISCSI_PARAM_PASSWORD_IN;
2255 else if (attr == &dev_attr_sess_fast_abort.attr)
2256 param = ISCSI_PARAM_FAST_ABORT;
2257 else if (attr == &dev_attr_sess_abort_tmo.attr)
2258 param = ISCSI_PARAM_ABORT_TMO;
2259 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2260 param = ISCSI_PARAM_LU_RESET_TMO;
2261 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2262 param = ISCSI_PARAM_TGT_RESET_TMO;
2263 else if (attr == &dev_attr_sess_ifacename.attr)
2264 param = ISCSI_PARAM_IFACE_NAME;
2265 else if (attr == &dev_attr_sess_initiatorname.attr)
2266 param = ISCSI_PARAM_INITIATOR_NAME;
2267 else if (attr == &dev_attr_sess_targetalias.attr)
2268 param = ISCSI_PARAM_TARGET_ALIAS;
2269 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2270 return S_IRUGO | S_IWUSR;
2271 else if (attr == &dev_attr_priv_sess_state.attr)
2272 return S_IRUGO;
2273 else {
2274 WARN_ONCE(1, "Invalid session attr");
2275 return 0;
2276 }
2277
2278 return t->attr_is_visible(ISCSI_PARAM, param);
2279 }
2280
2281 static struct attribute_group iscsi_session_group = {
2282 .attrs = iscsi_session_attrs,
2283 .is_visible = iscsi_session_attr_is_visible,
2284 };
2285
2286 /*
2287 * iSCSI host attrs
2288 */
2289 #define iscsi_host_attr_show(param) \
2290 static ssize_t \
2291 show_host_param_##param(struct device *dev, \
2292 struct device_attribute *attr, char *buf) \
2293 { \
2294 struct Scsi_Host *shost = transport_class_to_shost(dev); \
2295 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2296 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2297 }
2298
2299 #define iscsi_host_attr(field, param) \
2300 iscsi_host_attr_show(param) \
2301 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2302 NULL);
2303
2304 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2305 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2306 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2307 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2308
2309 static struct attribute *iscsi_host_attrs[] = {
2310 &dev_attr_host_netdev.attr,
2311 &dev_attr_host_hwaddress.attr,
2312 &dev_attr_host_ipaddress.attr,
2313 &dev_attr_host_initiatorname.attr,
2314 NULL,
2315 };
2316
2317 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2318 struct attribute *attr, int i)
2319 {
2320 struct device *cdev = container_of(kobj, struct device, kobj);
2321 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2322 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2323 int param;
2324
2325 if (attr == &dev_attr_host_netdev.attr)
2326 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2327 else if (attr == &dev_attr_host_hwaddress.attr)
2328 param = ISCSI_HOST_PARAM_HWADDRESS;
2329 else if (attr == &dev_attr_host_ipaddress.attr)
2330 param = ISCSI_HOST_PARAM_IPADDRESS;
2331 else if (attr == &dev_attr_host_initiatorname.attr)
2332 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2333 else {
2334 WARN_ONCE(1, "Invalid host attr");
2335 return 0;
2336 }
2337
2338 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2339 }
2340
2341 static struct attribute_group iscsi_host_group = {
2342 .attrs = iscsi_host_attrs,
2343 .is_visible = iscsi_host_attr_is_visible,
2344 };
2345
2346 static int iscsi_session_match(struct attribute_container *cont,
2347 struct device *dev)
2348 {
2349 struct iscsi_cls_session *session;
2350 struct Scsi_Host *shost;
2351 struct iscsi_internal *priv;
2352
2353 if (!iscsi_is_session_dev(dev))
2354 return 0;
2355
2356 session = iscsi_dev_to_session(dev);
2357 shost = iscsi_session_to_shost(session);
2358 if (!shost->transportt)
2359 return 0;
2360
2361 priv = to_iscsi_internal(shost->transportt);
2362 if (priv->session_cont.ac.class != &iscsi_session_class.class)
2363 return 0;
2364
2365 return &priv->session_cont.ac == cont;
2366 }
2367
2368 static int iscsi_conn_match(struct attribute_container *cont,
2369 struct device *dev)
2370 {
2371 struct iscsi_cls_session *session;
2372 struct iscsi_cls_conn *conn;
2373 struct Scsi_Host *shost;
2374 struct iscsi_internal *priv;
2375
2376 if (!iscsi_is_conn_dev(dev))
2377 return 0;
2378
2379 conn = iscsi_dev_to_conn(dev);
2380 session = iscsi_dev_to_session(conn->dev.parent);
2381 shost = iscsi_session_to_shost(session);
2382
2383 if (!shost->transportt)
2384 return 0;
2385
2386 priv = to_iscsi_internal(shost->transportt);
2387 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2388 return 0;
2389
2390 return &priv->conn_cont.ac == cont;
2391 }
2392
2393 static int iscsi_host_match(struct attribute_container *cont,
2394 struct device *dev)
2395 {
2396 struct Scsi_Host *shost;
2397 struct iscsi_internal *priv;
2398
2399 if (!scsi_is_host_device(dev))
2400 return 0;
2401
2402 shost = dev_to_shost(dev);
2403 if (!shost->transportt ||
2404 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2405 return 0;
2406
2407 priv = to_iscsi_internal(shost->transportt);
2408 return &priv->t.host_attrs.ac == cont;
2409 }
2410
2411 struct scsi_transport_template *
2412 iscsi_register_transport(struct iscsi_transport *tt)
2413 {
2414 struct iscsi_internal *priv;
2415 unsigned long flags;
2416 int err;
2417
2418 BUG_ON(!tt);
2419
2420 priv = iscsi_if_transport_lookup(tt);
2421 if (priv)
2422 return NULL;
2423
2424 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2425 if (!priv)
2426 return NULL;
2427 INIT_LIST_HEAD(&priv->list);
2428 priv->iscsi_transport = tt;
2429 priv->t.user_scan = iscsi_user_scan;
2430 priv->t.create_work_queue = 1;
2431
2432 priv->dev.class = &iscsi_transport_class;
2433 dev_set_name(&priv->dev, "%s", tt->name);
2434 err = device_register(&priv->dev);
2435 if (err)
2436 goto free_priv;
2437
2438 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2439 if (err)
2440 goto unregister_dev;
2441
2442 /* host parameters */
2443 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2444 priv->t.host_attrs.ac.match = iscsi_host_match;
2445 priv->t.host_attrs.ac.grp = &iscsi_host_group;
2446 priv->t.host_size = sizeof(struct iscsi_cls_host);
2447 transport_container_register(&priv->t.host_attrs);
2448
2449 /* connection parameters */
2450 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2451 priv->conn_cont.ac.match = iscsi_conn_match;
2452 priv->conn_cont.ac.grp = &iscsi_conn_group;
2453 transport_container_register(&priv->conn_cont);
2454
2455 /* session parameters */
2456 priv->session_cont.ac.class = &iscsi_session_class.class;
2457 priv->session_cont.ac.match = iscsi_session_match;
2458 priv->session_cont.ac.grp = &iscsi_session_group;
2459 transport_container_register(&priv->session_cont);
2460
2461 spin_lock_irqsave(&iscsi_transport_lock, flags);
2462 list_add(&priv->list, &iscsi_transports);
2463 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2464
2465 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2466 return &priv->t;
2467
2468 unregister_dev:
2469 device_unregister(&priv->dev);
2470 return NULL;
2471 free_priv:
2472 kfree(priv);
2473 return NULL;
2474 }
2475 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2476
2477 int iscsi_unregister_transport(struct iscsi_transport *tt)
2478 {
2479 struct iscsi_internal *priv;
2480 unsigned long flags;
2481
2482 BUG_ON(!tt);
2483
2484 mutex_lock(&rx_queue_mutex);
2485
2486 priv = iscsi_if_transport_lookup(tt);
2487 BUG_ON (!priv);
2488
2489 spin_lock_irqsave(&iscsi_transport_lock, flags);
2490 list_del(&priv->list);
2491 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2492
2493 transport_container_unregister(&priv->conn_cont);
2494 transport_container_unregister(&priv->session_cont);
2495 transport_container_unregister(&priv->t.host_attrs);
2496
2497 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2498 device_unregister(&priv->dev);
2499 mutex_unlock(&rx_queue_mutex);
2500
2501 return 0;
2502 }
2503 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2504
2505 static __init int iscsi_transport_init(void)
2506 {
2507 int err;
2508
2509 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2510 ISCSI_TRANSPORT_VERSION);
2511
2512 atomic_set(&iscsi_session_nr, 0);
2513
2514 err = class_register(&iscsi_transport_class);
2515 if (err)
2516 return err;
2517
2518 err = class_register(&iscsi_endpoint_class);
2519 if (err)
2520 goto unregister_transport_class;
2521
2522 err = class_register(&iscsi_iface_class);
2523 if (err)
2524 goto unregister_endpoint_class;
2525
2526 err = transport_class_register(&iscsi_host_class);
2527 if (err)
2528 goto unregister_iface_class;
2529
2530 err = transport_class_register(&iscsi_connection_class);
2531 if (err)
2532 goto unregister_host_class;
2533
2534 err = transport_class_register(&iscsi_session_class);
2535 if (err)
2536 goto unregister_conn_class;
2537
2538 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2539 NULL, THIS_MODULE);
2540 if (!nls) {
2541 err = -ENOBUFS;
2542 goto unregister_session_class;
2543 }
2544
2545 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2546 if (!iscsi_eh_timer_workq)
2547 goto release_nls;
2548
2549 return 0;
2550
2551 release_nls:
2552 netlink_kernel_release(nls);
2553 unregister_session_class:
2554 transport_class_unregister(&iscsi_session_class);
2555 unregister_conn_class:
2556 transport_class_unregister(&iscsi_connection_class);
2557 unregister_host_class:
2558 transport_class_unregister(&iscsi_host_class);
2559 unregister_iface_class:
2560 class_unregister(&iscsi_iface_class);
2561 unregister_endpoint_class:
2562 class_unregister(&iscsi_endpoint_class);
2563 unregister_transport_class:
2564 class_unregister(&iscsi_transport_class);
2565 return err;
2566 }
2567
2568 static void __exit iscsi_transport_exit(void)
2569 {
2570 destroy_workqueue(iscsi_eh_timer_workq);
2571 netlink_kernel_release(nls);
2572 transport_class_unregister(&iscsi_connection_class);
2573 transport_class_unregister(&iscsi_session_class);
2574 transport_class_unregister(&iscsi_host_class);
2575 class_unregister(&iscsi_endpoint_class);
2576 class_unregister(&iscsi_iface_class);
2577 class_unregister(&iscsi_transport_class);
2578 }
2579
2580 module_init(iscsi_transport_init);
2581 module_exit(iscsi_transport_exit);
2582
2583 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2584 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2585 "Alex Aizman <itn780@yahoo.com>");
2586 MODULE_DESCRIPTION("iSCSI Transport Interface");
2587 MODULE_LICENSE("GPL");
2588 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2589 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree