blob: 332387a6bc25de2210a6137c9ccdd4c1e34a6bd0 [file] [log] [blame]
Alex Aizman0896b752005-08-04 19:33:07 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
Alex Aizman0896b752005-08-04 19:33:07 -07005 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
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>
Arjan van de Ven0b950672006-01-11 13:16:10 +010024#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Alex Aizman0896b752005-08-04 19:33:07 -070026#include <net/tcp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#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>
Alex Aizman0896b752005-08-04 19:33:07 -070032#include <scsi/iscsi_if.h>
Mike Christiec01be6d2010-07-22 16:59:49 +053033#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Vikas Chaudhary3b2bef12010-07-10 14:51:30 +053035#define ISCSI_SESSION_ATTRS 23
Mike Christiec238c3b2008-01-31 13:36:51 -060036#define ISCSI_CONN_ATTRS 13
Mike Christied8196ed2007-05-30 12:57:25 -050037#define ISCSI_HOST_ATTRS 4
Mike Christied82ff9be2008-05-21 15:54:13 -050038
Mike Christie4c2133c2008-06-16 10:11:34 -050039#define ISCSI_TRANSPORT_VERSION "2.0-870"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Mike Christie632248a2009-08-20 15:11:01 -050041static int dbg_session;
42module_param_named(debug_session, dbg_session, int,
43 S_IRUGO | S_IWUSR);
44MODULE_PARM_DESC(debug_session,
45 "Turn on debugging for sessions in scsi_transport_iscsi "
46 "module. Set to 1 to turn on, and zero to turn off. Default "
47 "is off.");
48
49static int dbg_conn;
50module_param_named(debug_conn, dbg_conn, int,
51 S_IRUGO | S_IWUSR);
52MODULE_PARM_DESC(debug_conn,
53 "Turn on debugging for connections in scsi_transport_iscsi "
54 "module. Set to 1 to turn on, and zero to turn off. Default "
55 "is off.");
56
57#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58 do { \
59 if (dbg_session) \
60 iscsi_cls_session_printk(KERN_INFO, _session, \
61 "%s: " dbg_fmt, \
62 __func__, ##arg); \
63 } while (0);
64
65#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
66 do { \
67 if (dbg_conn) \
68 iscsi_cls_conn_printk(KERN_INFO, _conn, \
69 "%s: " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073struct iscsi_internal {
74 struct scsi_transport_template t;
Alex Aizman0896b752005-08-04 19:33:07 -070075 struct iscsi_transport *iscsi_transport;
76 struct list_head list;
Tony Jonesee959b02008-02-22 00:13:36 +010077 struct device dev;
Mike Christie30a6c652006-04-06 21:13:39 -050078
Tony Jonesee959b02008-02-22 00:13:36 +010079 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
Alex Aizman0896b752005-08-04 19:33:07 -070080 struct transport_container conn_cont;
Tony Jonesee959b02008-02-22 00:13:36 +010081 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
Alex Aizman0896b752005-08-04 19:33:07 -070082 struct transport_container session_cont;
Tony Jonesee959b02008-02-22 00:13:36 +010083 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070084};
85
Mike Christie41be1442007-02-28 17:32:18 -060086static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
Mike Christied8bf5412007-12-13 12:43:27 -060087static struct workqueue_struct *iscsi_eh_timer_workq;
Mike Christieb5c7a122006-04-06 21:13:33 -050088
Alex Aizman0896b752005-08-04 19:33:07 -070089/*
90 * list of registered transports and lock that must
91 * be held while accessing list. The iscsi_transport_lock must
Arjan van de Ven0b950672006-01-11 13:16:10 +010092 * be acquired after the rx_queue_mutex.
Alex Aizman0896b752005-08-04 19:33:07 -070093 */
94static LIST_HEAD(iscsi_transports);
95static DEFINE_SPINLOCK(iscsi_transport_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Alex Aizman0896b752005-08-04 19:33:07 -070097#define to_iscsi_internal(tmpl) \
98 container_of(tmpl, struct iscsi_internal, t)
99
Tony Jonesee959b02008-02-22 00:13:36 +0100100#define dev_to_iscsi_internal(_dev) \
101 container_of(_dev, struct iscsi_internal, dev)
Alex Aizman0896b752005-08-04 19:33:07 -0700102
Tony Jonesee959b02008-02-22 00:13:36 +0100103static void iscsi_transport_release(struct device *dev)
Alex Aizman0896b752005-08-04 19:33:07 -0700104{
Tony Jonesee959b02008-02-22 00:13:36 +0100105 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
Alex Aizman0896b752005-08-04 19:33:07 -0700106 kfree(priv);
107}
108
109/*
110 * iscsi_transport_class represents the iscsi_transports that are
111 * registered.
112 */
113static struct class iscsi_transport_class = {
114 .name = "iscsi_transport",
Tony Jonesee959b02008-02-22 00:13:36 +0100115 .dev_release = iscsi_transport_release,
Alex Aizman0896b752005-08-04 19:33:07 -0700116};
117
118static ssize_t
Tony Jonesee959b02008-02-22 00:13:36 +0100119show_transport_handle(struct device *dev, struct device_attribute *attr,
120 char *buf)
Alex Aizman0896b752005-08-04 19:33:07 -0700121{
Tony Jonesee959b02008-02-22 00:13:36 +0100122 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
Mike Christie762e2bf2005-09-12 21:01:46 -0500123 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
Alex Aizman0896b752005-08-04 19:33:07 -0700124}
Tony Jonesee959b02008-02-22 00:13:36 +0100125static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
Alex Aizman0896b752005-08-04 19:33:07 -0700126
127#define show_transport_attr(name, format) \
128static ssize_t \
Tony Jonesee959b02008-02-22 00:13:36 +0100129show_transport_##name(struct device *dev, \
130 struct device_attribute *attr,char *buf) \
Alex Aizman0896b752005-08-04 19:33:07 -0700131{ \
Tony Jonesee959b02008-02-22 00:13:36 +0100132 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
Alex Aizman0896b752005-08-04 19:33:07 -0700133 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
134} \
Tony Jonesee959b02008-02-22 00:13:36 +0100135static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
Alex Aizman0896b752005-08-04 19:33:07 -0700136
137show_transport_attr(caps, "0x%x");
Alex Aizman0896b752005-08-04 19:33:07 -0700138
139static struct attribute *iscsi_transport_attrs[] = {
Tony Jonesee959b02008-02-22 00:13:36 +0100140 &dev_attr_handle.attr,
141 &dev_attr_caps.attr,
Alex Aizman0896b752005-08-04 19:33:07 -0700142 NULL,
143};
144
145static struct attribute_group iscsi_transport_group = {
146 .attrs = iscsi_transport_attrs,
147};
148
Mike Christied82ff9be2008-05-21 15:54:13 -0500149/*
150 * iSCSI endpoint attrs
151 */
152#define iscsi_dev_to_endpoint(_dev) \
153 container_of(_dev, struct iscsi_endpoint, dev)
154
155#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
156struct device_attribute dev_attr_##_prefix##_##_name = \
157 __ATTR(_name,_mode,_show,_store)
158
159static void iscsi_endpoint_release(struct device *dev)
160{
161 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
162 kfree(ep);
163}
164
165static struct class iscsi_endpoint_class = {
166 .name = "iscsi_endpoint",
167 .dev_release = iscsi_endpoint_release,
168};
169
170static ssize_t
171show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
172{
173 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
Mike Christie21536062008-09-24 11:46:11 -0500174 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
Mike Christied82ff9be2008-05-21 15:54:13 -0500175}
176static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
177
178static struct attribute *iscsi_endpoint_attrs[] = {
179 &dev_attr_ep_handle.attr,
180 NULL,
181};
182
183static struct attribute_group iscsi_endpoint_group = {
184 .attrs = iscsi_endpoint_attrs,
185};
186
187#define ISCSI_MAX_EPID -1
188
189static int iscsi_match_epid(struct device *dev, void *data)
190{
191 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
Mike Christie21536062008-09-24 11:46:11 -0500192 uint64_t *epid = (uint64_t *) data;
Mike Christied82ff9be2008-05-21 15:54:13 -0500193
194 return *epid == ep->id;
195}
196
197struct iscsi_endpoint *
198iscsi_create_endpoint(int dd_size)
199{
200 struct device *dev;
201 struct iscsi_endpoint *ep;
Mike Christie21536062008-09-24 11:46:11 -0500202 uint64_t id;
Mike Christied82ff9be2008-05-21 15:54:13 -0500203 int err;
204
205 for (id = 1; id < ISCSI_MAX_EPID; id++) {
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -0400206 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
Mike Christied82ff9be2008-05-21 15:54:13 -0500207 iscsi_match_epid);
208 if (!dev)
209 break;
210 }
211 if (id == ISCSI_MAX_EPID) {
212 printk(KERN_ERR "Too many connections. Max supported %u\n",
213 ISCSI_MAX_EPID - 1);
214 return NULL;
215 }
216
217 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
218 if (!ep)
219 return NULL;
220
221 ep->id = id;
222 ep->dev.class = &iscsi_endpoint_class;
Kay Sievers71610f52008-12-03 22:41:36 +0100223 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
Mike Christied82ff9be2008-05-21 15:54:13 -0500224 err = device_register(&ep->dev);
225 if (err)
226 goto free_ep;
227
228 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
229 if (err)
230 goto unregister_dev;
231
232 if (dd_size)
233 ep->dd_data = &ep[1];
234 return ep;
235
236unregister_dev:
237 device_unregister(&ep->dev);
238 return NULL;
239
240free_ep:
241 kfree(ep);
242 return NULL;
243}
244EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
245
246void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
247{
248 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
249 device_unregister(&ep->dev);
250}
251EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
252
253struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
254{
Mike Christief80f8682008-06-16 10:11:35 -0500255 struct iscsi_endpoint *ep;
Mike Christied82ff9be2008-05-21 15:54:13 -0500256 struct device *dev;
257
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -0400258 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
Mike Christied82ff9be2008-05-21 15:54:13 -0500259 iscsi_match_epid);
260 if (!dev)
261 return NULL;
262
Mike Christief80f8682008-06-16 10:11:35 -0500263 ep = iscsi_dev_to_endpoint(dev);
264 /*
265 * we can drop this now because the interface will prevent
266 * removals and lookups from racing.
267 */
268 put_device(dev);
269 return ep;
Mike Christied82ff9be2008-05-21 15:54:13 -0500270}
271EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
272
Mike Christie30a6c652006-04-06 21:13:39 -0500273static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
Tony Jonesee959b02008-02-22 00:13:36 +0100274 struct device *cdev)
Mike Christie30a6c652006-04-06 21:13:39 -0500275{
276 struct Scsi_Host *shost = dev_to_shost(dev);
Mike Christie32c6e1b2008-05-21 15:53:58 -0500277 struct iscsi_cls_host *ihost = shost->shost_data;
Mike Christie30a6c652006-04-06 21:13:39 -0500278
279 memset(ihost, 0, sizeof(*ihost));
Mike Christie8aae18a2008-01-31 13:36:48 -0600280 atomic_set(&ihost->nr_scans, 0);
Mike Christie79706342008-05-21 15:54:12 -0500281 mutex_init(&ihost->mutex);
Mike Christie30a6c652006-04-06 21:13:39 -0500282 return 0;
283}
284
285static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
286 "iscsi_host",
287 iscsi_setup_host,
Mike Christie06d25af2009-03-05 14:46:02 -0600288 NULL,
Mike Christie30a6c652006-04-06 21:13:39 -0500289 NULL);
290
Alex Aizman0896b752005-08-04 19:33:07 -0700291static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
292 "iscsi_session",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 NULL,
294 NULL,
295 NULL);
296
Alex Aizman0896b752005-08-04 19:33:07 -0700297static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
298 "iscsi_connection",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 NULL,
300 NULL,
301 NULL);
Alex Aizman0896b752005-08-04 19:33:07 -0700302
303static struct sock *nls;
Arjan van de Ven0b950672006-01-11 13:16:10 +0100304static DEFINE_MUTEX(rx_queue_mutex);
Alex Aizman0896b752005-08-04 19:33:07 -0700305
Mike Christie7b7232f2006-02-01 21:06:49 -0600306static LIST_HEAD(sesslist);
307static DEFINE_SPINLOCK(sesslock);
Alex Aizman0896b752005-08-04 19:33:07 -0700308static LIST_HEAD(connlist);
309static DEFINE_SPINLOCK(connlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Mike Christieb5c7a122006-04-06 21:13:33 -0500311static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
312{
313 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
314 return sess->sid;
315}
316
317/*
318 * Returns the matching session to a given sid
319 */
320static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
Mike Christie7b7232f2006-02-01 21:06:49 -0600321{
322 unsigned long flags;
323 struct iscsi_cls_session *sess;
324
325 spin_lock_irqsave(&sesslock, flags);
326 list_for_each_entry(sess, &sesslist, sess_list) {
Mike Christieb5c7a122006-04-06 21:13:33 -0500327 if (sess->sid == sid) {
Mike Christie7b7232f2006-02-01 21:06:49 -0600328 spin_unlock_irqrestore(&sesslock, flags);
329 return sess;
330 }
331 }
332 spin_unlock_irqrestore(&sesslock, flags);
333 return NULL;
334}
335
Mike Christieb5c7a122006-04-06 21:13:33 -0500336/*
337 * Returns the matching connection to a given sid / cid tuple
338 */
339static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
Mike Christie7b7232f2006-02-01 21:06:49 -0600340{
341 unsigned long flags;
342 struct iscsi_cls_conn *conn;
343
344 spin_lock_irqsave(&connlock, flags);
345 list_for_each_entry(conn, &connlist, conn_list) {
Mike Christieb5c7a122006-04-06 21:13:33 -0500346 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
Mike Christie7b7232f2006-02-01 21:06:49 -0600347 spin_unlock_irqrestore(&connlock, flags);
348 return conn;
349 }
350 }
351 spin_unlock_irqrestore(&connlock, flags);
352 return NULL;
353}
354
Mike Christie7b8631b2006-01-13 18:05:50 -0600355/*
356 * The following functions can be used by LLDs that allocate
357 * their own scsi_hosts or by software iscsi LLDs
358 */
Mike Christie6eabafb2008-01-31 13:36:43 -0600359static struct {
360 int value;
361 char *name;
362} iscsi_session_state_names[] = {
363 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
364 { ISCSI_SESSION_FAILED, "FAILED" },
365 { ISCSI_SESSION_FREE, "FREE" },
366};
367
Adrian Bunk3b0f2082008-02-13 23:30:17 +0200368static const char *iscsi_session_state_name(int state)
Mike Christie6eabafb2008-01-31 13:36:43 -0600369{
370 int i;
371 char *name = NULL;
372
373 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
374 if (iscsi_session_state_names[i].value == state) {
375 name = iscsi_session_state_names[i].name;
376 break;
377 }
378 }
379 return name;
380}
381
382int iscsi_session_chkready(struct iscsi_cls_session *session)
383{
384 unsigned long flags;
385 int err;
386
387 spin_lock_irqsave(&session->lock, flags);
388 switch (session->state) {
389 case ISCSI_SESSION_LOGGED_IN:
390 err = 0;
391 break;
392 case ISCSI_SESSION_FAILED:
Andrew Vasquez9a1a69a12009-04-29 13:12:39 -0500393 err = DID_IMM_RETRY << 16;
Mike Christie6eabafb2008-01-31 13:36:43 -0600394 break;
395 case ISCSI_SESSION_FREE:
Mike Christie56d7fcf2008-08-19 18:45:26 -0500396 err = DID_TRANSPORT_FAILFAST << 16;
Mike Christie6eabafb2008-01-31 13:36:43 -0600397 break;
398 default:
399 err = DID_NO_CONNECT << 16;
400 break;
401 }
402 spin_unlock_irqrestore(&session->lock, flags);
403 return err;
404}
405EXPORT_SYMBOL_GPL(iscsi_session_chkready);
406
Mike Christie7b8631b2006-01-13 18:05:50 -0600407static void iscsi_session_release(struct device *dev)
408{
409 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
Mike Christie7b8631b2006-01-13 18:05:50 -0600410 struct Scsi_Host *shost;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Mike Christie7b8631b2006-01-13 18:05:50 -0600412 shost = iscsi_session_to_shost(session);
413 scsi_host_put(shost);
Mike Christie632248a2009-08-20 15:11:01 -0500414 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
Mike Christie7b8631b2006-01-13 18:05:50 -0600415 kfree(session);
Mike Christie7b8631b2006-01-13 18:05:50 -0600416}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Mike Christie7b8631b2006-01-13 18:05:50 -0600418static int iscsi_is_session_dev(const struct device *dev)
419{
420 return dev->release == iscsi_session_release;
421}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Mike Christiea4804cd2008-05-21 15:54:00 -0500423static int iscsi_iter_session_fn(struct device *dev, void *data)
424{
425 void (* fn) (struct iscsi_cls_session *) = data;
426
427 if (!iscsi_is_session_dev(dev))
428 return 0;
429 fn(iscsi_dev_to_session(dev));
430 return 0;
431}
432
433void iscsi_host_for_each_session(struct Scsi_Host *shost,
434 void (*fn)(struct iscsi_cls_session *))
435{
436 device_for_each_child(&shost->shost_gendev, fn,
437 iscsi_iter_session_fn);
438}
439EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
440
Mike Christie8aae18a2008-01-31 13:36:48 -0600441/**
442 * iscsi_scan_finished - helper to report when running scans are done
443 * @shost: scsi host
444 * @time: scan run time
445 *
446 * This function can be used by drives like qla4xxx to report to the scsi
447 * layer when the scans it kicked off at module load time are done.
448 */
449int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
450{
Mike Christie32c6e1b2008-05-21 15:53:58 -0500451 struct iscsi_cls_host *ihost = shost->shost_data;
Mike Christie8aae18a2008-01-31 13:36:48 -0600452 /*
453 * qla4xxx will have kicked off some session unblocks before calling
454 * scsi_scan_host, so just wait for them to complete.
455 */
456 return !atomic_read(&ihost->nr_scans);
457}
458EXPORT_SYMBOL_GPL(iscsi_scan_finished);
459
Mike Christie79706342008-05-21 15:54:12 -0500460struct iscsi_scan_data {
461 unsigned int channel;
462 unsigned int id;
463 unsigned int lun;
464};
465
466static int iscsi_user_scan_session(struct device *dev, void *data)
467{
468 struct iscsi_scan_data *scan_data = data;
469 struct iscsi_cls_session *session;
470 struct Scsi_Host *shost;
471 struct iscsi_cls_host *ihost;
472 unsigned long flags;
473 unsigned int id;
474
475 if (!iscsi_is_session_dev(dev))
476 return 0;
477
478 session = iscsi_dev_to_session(dev);
Mike Christie632248a2009-08-20 15:11:01 -0500479
480 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
481
Mike Christie79706342008-05-21 15:54:12 -0500482 shost = iscsi_session_to_shost(session);
483 ihost = shost->shost_data;
484
485 mutex_lock(&ihost->mutex);
486 spin_lock_irqsave(&session->lock, flags);
487 if (session->state != ISCSI_SESSION_LOGGED_IN) {
488 spin_unlock_irqrestore(&session->lock, flags);
Mike Christie632248a2009-08-20 15:11:01 -0500489 goto user_scan_exit;
Mike Christie79706342008-05-21 15:54:12 -0500490 }
491 id = session->target_id;
492 spin_unlock_irqrestore(&session->lock, flags);
493
494 if (id != ISCSI_MAX_TARGET) {
495 if ((scan_data->channel == SCAN_WILD_CARD ||
496 scan_data->channel == 0) &&
497 (scan_data->id == SCAN_WILD_CARD ||
498 scan_data->id == id))
499 scsi_scan_target(&session->dev, 0, id,
500 scan_data->lun, 1);
501 }
Mike Christie632248a2009-08-20 15:11:01 -0500502
503user_scan_exit:
Mike Christie79706342008-05-21 15:54:12 -0500504 mutex_unlock(&ihost->mutex);
Mike Christie632248a2009-08-20 15:11:01 -0500505 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
Mike Christie79706342008-05-21 15:54:12 -0500506 return 0;
507}
508
Mike Christie30a6c652006-04-06 21:13:39 -0500509static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
510 uint id, uint lun)
511{
Mike Christie79706342008-05-21 15:54:12 -0500512 struct iscsi_scan_data scan_data;
Mike Christie30a6c652006-04-06 21:13:39 -0500513
Mike Christie79706342008-05-21 15:54:12 -0500514 scan_data.channel = channel;
515 scan_data.id = id;
516 scan_data.lun = lun;
Mike Christie30a6c652006-04-06 21:13:39 -0500517
Mike Christie79706342008-05-21 15:54:12 -0500518 return device_for_each_child(&shost->shost_gendev, &scan_data,
519 iscsi_user_scan_session);
Mike Christie30a6c652006-04-06 21:13:39 -0500520}
521
Mike Christiebd976f62008-01-31 13:36:46 -0600522static void iscsi_scan_session(struct work_struct *work)
523{
524 struct iscsi_cls_session *session =
525 container_of(work, struct iscsi_cls_session, scan_work);
Mike Christie8aae18a2008-01-31 13:36:48 -0600526 struct Scsi_Host *shost = iscsi_session_to_shost(session);
Mike Christie32c6e1b2008-05-21 15:53:58 -0500527 struct iscsi_cls_host *ihost = shost->shost_data;
Mike Christie79706342008-05-21 15:54:12 -0500528 struct iscsi_scan_data scan_data;
Mike Christiebd976f62008-01-31 13:36:46 -0600529
Mike Christie79706342008-05-21 15:54:12 -0500530 scan_data.channel = 0;
531 scan_data.id = SCAN_WILD_CARD;
532 scan_data.lun = SCAN_WILD_CARD;
Mike Christiebd976f62008-01-31 13:36:46 -0600533
Mike Christie79706342008-05-21 15:54:12 -0500534 iscsi_user_scan_session(&session->dev, &scan_data);
Mike Christie8aae18a2008-01-31 13:36:48 -0600535 atomic_dec(&ihost->nr_scans);
Mike Christiebd976f62008-01-31 13:36:46 -0600536}
537
Mike Christiec01be6d2010-07-22 16:59:49 +0530538/**
539 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
Randy Dunlape6d4ef42010-08-14 13:05:41 -0700540 * @cmd: scsi cmd passed to scsi eh handler
Mike Christiec01be6d2010-07-22 16:59:49 +0530541 *
542 * If the session is down this function will wait for the recovery
543 * timer to fire or for the session to be logged back in. If the
544 * recovery timer fires then FAST_IO_FAIL is returned. The caller
545 * should pass this error value to the scsi eh.
546 */
547int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
548{
549 struct iscsi_cls_session *session =
550 starget_to_session(scsi_target(cmd->device));
551 unsigned long flags;
552 int ret = 0;
553
554 spin_lock_irqsave(&session->lock, flags);
555 while (session->state != ISCSI_SESSION_LOGGED_IN) {
556 if (session->state == ISCSI_SESSION_FREE) {
557 ret = FAST_IO_FAIL;
558 break;
559 }
560 spin_unlock_irqrestore(&session->lock, flags);
561 msleep(1000);
562 spin_lock_irqsave(&session->lock, flags);
563 }
564 spin_unlock_irqrestore(&session->lock, flags);
565 return ret;
566}
567EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
568
David Howellsc4028952006-11-22 14:57:56 +0000569static void session_recovery_timedout(struct work_struct *work)
Mike Christie30a6c652006-04-06 21:13:39 -0500570{
David Howellsc4028952006-11-22 14:57:56 +0000571 struct iscsi_cls_session *session =
572 container_of(work, struct iscsi_cls_session,
573 recovery_work.work);
Mike Christie6eabafb2008-01-31 13:36:43 -0600574 unsigned long flags;
Mike Christie30a6c652006-04-06 21:13:39 -0500575
Mike Christie322d7392008-01-31 13:36:52 -0600576 iscsi_cls_session_printk(KERN_INFO, session,
577 "session recovery timed out after %d secs\n",
578 session->recovery_tmo);
Mike Christie30a6c652006-04-06 21:13:39 -0500579
Mike Christie6eabafb2008-01-31 13:36:43 -0600580 spin_lock_irqsave(&session->lock, flags);
581 switch (session->state) {
582 case ISCSI_SESSION_FAILED:
583 session->state = ISCSI_SESSION_FREE;
584 break;
585 case ISCSI_SESSION_LOGGED_IN:
586 case ISCSI_SESSION_FREE:
587 /* we raced with the unblock's flush */
588 spin_unlock_irqrestore(&session->lock, flags);
589 return;
590 }
591 spin_unlock_irqrestore(&session->lock, flags);
592
Mike Christie30a6c652006-04-06 21:13:39 -0500593 if (session->transport->session_recovery_timedout)
594 session->transport->session_recovery_timedout(session);
595
Mike Christie632248a2009-08-20 15:11:01 -0500596 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
Mike Christie30a6c652006-04-06 21:13:39 -0500597 scsi_target_unblock(&session->dev);
Mike Christie632248a2009-08-20 15:11:01 -0500598 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
Mike Christie30a6c652006-04-06 21:13:39 -0500599}
600
Mike Christie45ab33b2008-03-04 13:26:55 -0600601static void __iscsi_unblock_session(struct work_struct *work)
Mike Christie30a6c652006-04-06 21:13:39 -0500602{
Mike Christie45ab33b2008-03-04 13:26:55 -0600603 struct iscsi_cls_session *session =
604 container_of(work, struct iscsi_cls_session,
605 unblock_work);
Mike Christiebd976f62008-01-31 13:36:46 -0600606 struct Scsi_Host *shost = iscsi_session_to_shost(session);
Mike Christie32c6e1b2008-05-21 15:53:58 -0500607 struct iscsi_cls_host *ihost = shost->shost_data;
Mike Christie6eabafb2008-01-31 13:36:43 -0600608 unsigned long flags;
609
Mike Christie632248a2009-08-20 15:11:01 -0500610 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
Mike Christie45ab33b2008-03-04 13:26:55 -0600611 /*
612 * The recovery and unblock work get run from the same workqueue,
613 * so try to cancel it if it was going to run after this unblock.
614 */
615 cancel_delayed_work(&session->recovery_work);
Mike Christie6eabafb2008-01-31 13:36:43 -0600616 spin_lock_irqsave(&session->lock, flags);
617 session->state = ISCSI_SESSION_LOGGED_IN;
618 spin_unlock_irqrestore(&session->lock, flags);
Mike Christie45ab33b2008-03-04 13:26:55 -0600619 /* start IO */
620 scsi_target_unblock(&session->dev);
Mike Christie8aae18a2008-01-31 13:36:48 -0600621 /*
622 * Only do kernel scanning if the driver is properly hooked into
623 * the async scanning code (drivers like iscsi_tcp do login and
624 * scanning from userspace).
625 */
626 if (shost->hostt->scan_finished) {
Mike Christie06d25af2009-03-05 14:46:02 -0600627 if (scsi_queue_work(shost, &session->scan_work))
Mike Christie8aae18a2008-01-31 13:36:48 -0600628 atomic_inc(&ihost->nr_scans);
629 }
Mike Christie632248a2009-08-20 15:11:01 -0500630 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
Mike Christie6eabafb2008-01-31 13:36:43 -0600631}
Mike Christie45ab33b2008-03-04 13:26:55 -0600632
633/**
634 * iscsi_unblock_session - set a session as logged in and start IO.
635 * @session: iscsi session
636 *
637 * Mark a session as ready to accept IO.
638 */
639void iscsi_unblock_session(struct iscsi_cls_session *session)
640{
641 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
642 /*
643 * make sure all the events have completed before tell the driver
644 * it is safe
645 */
646 flush_workqueue(iscsi_eh_timer_workq);
647}
Mike Christie30a6c652006-04-06 21:13:39 -0500648EXPORT_SYMBOL_GPL(iscsi_unblock_session);
649
Mike Christie45ab33b2008-03-04 13:26:55 -0600650static void __iscsi_block_session(struct work_struct *work)
Mike Christie30a6c652006-04-06 21:13:39 -0500651{
Mike Christie45ab33b2008-03-04 13:26:55 -0600652 struct iscsi_cls_session *session =
653 container_of(work, struct iscsi_cls_session,
654 block_work);
Mike Christie6eabafb2008-01-31 13:36:43 -0600655 unsigned long flags;
656
Mike Christie632248a2009-08-20 15:11:01 -0500657 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
Mike Christie6eabafb2008-01-31 13:36:43 -0600658 spin_lock_irqsave(&session->lock, flags);
659 session->state = ISCSI_SESSION_FAILED;
660 spin_unlock_irqrestore(&session->lock, flags);
Mike Christie30a6c652006-04-06 21:13:39 -0500661 scsi_target_block(&session->dev);
Mike Christie632248a2009-08-20 15:11:01 -0500662 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
Mike Christiefdd46dc2009-11-11 16:34:34 -0600663 if (session->recovery_tmo >= 0)
664 queue_delayed_work(iscsi_eh_timer_workq,
665 &session->recovery_work,
666 session->recovery_tmo * HZ);
Mike Christie30a6c652006-04-06 21:13:39 -0500667}
Mike Christie45ab33b2008-03-04 13:26:55 -0600668
669void iscsi_block_session(struct iscsi_cls_session *session)
670{
671 queue_work(iscsi_eh_timer_workq, &session->block_work);
672}
Mike Christie30a6c652006-04-06 21:13:39 -0500673EXPORT_SYMBOL_GPL(iscsi_block_session);
674
Mike Christie26974782007-12-13 12:43:29 -0600675static void __iscsi_unbind_session(struct work_struct *work)
676{
677 struct iscsi_cls_session *session =
678 container_of(work, struct iscsi_cls_session,
679 unbind_work);
680 struct Scsi_Host *shost = iscsi_session_to_shost(session);
Mike Christie32c6e1b2008-05-21 15:53:58 -0500681 struct iscsi_cls_host *ihost = shost->shost_data;
Mike Christie79706342008-05-21 15:54:12 -0500682 unsigned long flags;
Mike Christie26974782007-12-13 12:43:29 -0600683
Mike Christie632248a2009-08-20 15:11:01 -0500684 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
685
Mike Christie26974782007-12-13 12:43:29 -0600686 /* Prevent new scans and make sure scanning is not in progress */
687 mutex_lock(&ihost->mutex);
Mike Christie79706342008-05-21 15:54:12 -0500688 spin_lock_irqsave(&session->lock, flags);
689 if (session->target_id == ISCSI_MAX_TARGET) {
690 spin_unlock_irqrestore(&session->lock, flags);
Mike Christie26974782007-12-13 12:43:29 -0600691 mutex_unlock(&ihost->mutex);
692 return;
693 }
Mike Christie79706342008-05-21 15:54:12 -0500694 session->target_id = ISCSI_MAX_TARGET;
695 spin_unlock_irqrestore(&session->lock, flags);
Mike Christie26974782007-12-13 12:43:29 -0600696 mutex_unlock(&ihost->mutex);
697
698 scsi_remove_target(&session->dev);
699 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
Mike Christie632248a2009-08-20 15:11:01 -0500700 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
Mike Christie26974782007-12-13 12:43:29 -0600701}
702
Mike Christie7b8631b2006-01-13 18:05:50 -0600703struct iscsi_cls_session *
Mike Christie5d91e202008-05-21 15:54:01 -0500704iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
705 int dd_size)
Mike Christie7b8631b2006-01-13 18:05:50 -0600706{
707 struct iscsi_cls_session *session;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Mike Christie5d91e202008-05-21 15:54:01 -0500709 session = kzalloc(sizeof(*session) + dd_size,
Mike Christieb5c7a122006-04-06 21:13:33 -0500710 GFP_KERNEL);
Mike Christie7b8631b2006-01-13 18:05:50 -0600711 if (!session)
Mike Christief53a88d2006-06-28 12:00:27 -0500712 return NULL;
713
Mike Christie7b8631b2006-01-13 18:05:50 -0600714 session->transport = transport;
Mike Christie30a6c652006-04-06 21:13:39 -0500715 session->recovery_tmo = 120;
Mike Christie6eabafb2008-01-31 13:36:43 -0600716 session->state = ISCSI_SESSION_FREE;
David Howellsc4028952006-11-22 14:57:56 +0000717 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
Mike Christie30a6c652006-04-06 21:13:39 -0500718 INIT_LIST_HEAD(&session->sess_list);
Mike Christie45ab33b2008-03-04 13:26:55 -0600719 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
720 INIT_WORK(&session->block_work, __iscsi_block_session);
Mike Christie26974782007-12-13 12:43:29 -0600721 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
Mike Christiebd976f62008-01-31 13:36:46 -0600722 INIT_WORK(&session->scan_work, iscsi_scan_session);
Mike Christie6eabafb2008-01-31 13:36:43 -0600723 spin_lock_init(&session->lock);
Mike Christie7b8631b2006-01-13 18:05:50 -0600724
Mike Christie6a8a0d32006-06-28 12:00:31 -0500725 /* this is released in the dev's release function */
726 scsi_host_get(shost);
Mike Christie8434aa82006-06-28 12:00:30 -0500727 session->dev.parent = &shost->shost_gendev;
728 session->dev.release = iscsi_session_release;
729 device_initialize(&session->dev);
Mike Christie5d91e202008-05-21 15:54:01 -0500730 if (dd_size)
Mike Christieb5c7a122006-04-06 21:13:33 -0500731 session->dd_data = &session[1];
Mike Christie632248a2009-08-20 15:11:01 -0500732
733 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
Mike Christie8434aa82006-06-28 12:00:30 -0500734 return session;
735}
736EXPORT_SYMBOL_GPL(iscsi_alloc_session);
737
Mike Christie79706342008-05-21 15:54:12 -0500738static int iscsi_get_next_target_id(struct device *dev, void *data)
739{
740 struct iscsi_cls_session *session;
741 unsigned long flags;
742 int err = 0;
743
744 if (!iscsi_is_session_dev(dev))
745 return 0;
746
747 session = iscsi_dev_to_session(dev);
748 spin_lock_irqsave(&session->lock, flags);
749 if (*((unsigned int *) data) == session->target_id)
750 err = -EEXIST;
751 spin_unlock_irqrestore(&session->lock, flags);
752 return err;
753}
754
Mike Christie6a8a0d32006-06-28 12:00:31 -0500755int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
Mike Christie8434aa82006-06-28 12:00:30 -0500756{
757 struct Scsi_Host *shost = iscsi_session_to_shost(session);
Mike Christie32c6e1b2008-05-21 15:53:58 -0500758 struct iscsi_cls_host *ihost;
Mike Christie26974782007-12-13 12:43:29 -0600759 unsigned long flags;
Mike Christie79706342008-05-21 15:54:12 -0500760 unsigned int id = target_id;
Mike Christie8434aa82006-06-28 12:00:30 -0500761 int err;
Mike Christieb5c7a122006-04-06 21:13:33 -0500762
Mike Christie30a6c652006-04-06 21:13:39 -0500763 ihost = shost->shost_data;
Mike Christie41be1442007-02-28 17:32:18 -0600764 session->sid = atomic_add_return(1, &iscsi_session_nr);
Mike Christie79706342008-05-21 15:54:12 -0500765
766 if (id == ISCSI_MAX_TARGET) {
767 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
768 err = device_for_each_child(&shost->shost_gendev, &id,
769 iscsi_get_next_target_id);
770 if (!err)
771 break;
772 }
773
774 if (id == ISCSI_MAX_TARGET) {
775 iscsi_cls_session_printk(KERN_ERR, session,
776 "Too many iscsi targets. Max "
777 "number of targets is %d.\n",
778 ISCSI_MAX_TARGET - 1);
Jaswinder Singh Rajput24add1c2009-06-20 13:29:21 +0530779 err = -EOVERFLOW;
Mike Christie79706342008-05-21 15:54:12 -0500780 goto release_host;
781 }
782 }
783 session->target_id = id;
Mike Christie30a6c652006-04-06 21:13:39 -0500784
Kay Sievers71610f52008-12-03 22:41:36 +0100785 dev_set_name(&session->dev, "session%u", session->sid);
Mike Christie8434aa82006-06-28 12:00:30 -0500786 err = device_add(&session->dev);
Mike Christie7b8631b2006-01-13 18:05:50 -0600787 if (err) {
Mike Christie322d7392008-01-31 13:36:52 -0600788 iscsi_cls_session_printk(KERN_ERR, session,
789 "could not register session's dev\n");
Mike Christie8434aa82006-06-28 12:00:30 -0500790 goto release_host;
Mike Christie7b8631b2006-01-13 18:05:50 -0600791 }
792 transport_register_device(&session->dev);
793
Mike Christie26974782007-12-13 12:43:29 -0600794 spin_lock_irqsave(&sesslock, flags);
795 list_add(&session->sess_list, &sesslist);
796 spin_unlock_irqrestore(&sesslock, flags);
797
Mike Christie26974782007-12-13 12:43:29 -0600798 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
Mike Christie632248a2009-08-20 15:11:01 -0500799 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
Mike Christie8434aa82006-06-28 12:00:30 -0500800 return 0;
Mike Christie30a6c652006-04-06 21:13:39 -0500801
Mike Christie8434aa82006-06-28 12:00:30 -0500802release_host:
803 scsi_host_put(shost);
804 return err;
Mike Christie7b8631b2006-01-13 18:05:50 -0600805}
Mike Christie8434aa82006-06-28 12:00:30 -0500806EXPORT_SYMBOL_GPL(iscsi_add_session);
Mike Christie7b8631b2006-01-13 18:05:50 -0600807
808/**
Mike Christie8434aa82006-06-28 12:00:30 -0500809 * iscsi_create_session - create iscsi class session
810 * @shost: scsi host
811 * @transport: iscsi transport
Mike Christie5d91e202008-05-21 15:54:01 -0500812 * @dd_size: private driver data size
Rob Landleyeb448202007-11-03 13:30:39 -0500813 * @target_id: which target
Mike Christie7b8631b2006-01-13 18:05:50 -0600814 *
Mike Christie8434aa82006-06-28 12:00:30 -0500815 * This can be called from a LLD or iscsi_transport.
Rob Landleyeb448202007-11-03 13:30:39 -0500816 */
Mike Christie8434aa82006-06-28 12:00:30 -0500817struct iscsi_cls_session *
Mike Christie5d91e202008-05-21 15:54:01 -0500818iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
819 int dd_size, unsigned int target_id)
Mike Christie8434aa82006-06-28 12:00:30 -0500820{
821 struct iscsi_cls_session *session;
822
Mike Christie5d91e202008-05-21 15:54:01 -0500823 session = iscsi_alloc_session(shost, transport, dd_size);
Mike Christie8434aa82006-06-28 12:00:30 -0500824 if (!session)
825 return NULL;
826
Mike Christie6a8a0d32006-06-28 12:00:31 -0500827 if (iscsi_add_session(session, target_id)) {
Mike Christie8434aa82006-06-28 12:00:30 -0500828 iscsi_free_session(session);
829 return NULL;
830 }
831 return session;
832}
833EXPORT_SYMBOL_GPL(iscsi_create_session);
834
Mike Christie26974782007-12-13 12:43:29 -0600835static void iscsi_conn_release(struct device *dev)
836{
837 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
838 struct device *parent = conn->dev.parent;
839
Mike Christie632248a2009-08-20 15:11:01 -0500840 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
Mike Christie26974782007-12-13 12:43:29 -0600841 kfree(conn);
842 put_device(parent);
843}
844
845static int iscsi_is_conn_dev(const struct device *dev)
846{
847 return dev->release == iscsi_conn_release;
848}
849
850static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
851{
852 if (!iscsi_is_conn_dev(dev))
853 return 0;
854 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
855}
856
Mike Christie8434aa82006-06-28 12:00:30 -0500857void iscsi_remove_session(struct iscsi_cls_session *session)
Mike Christie7b8631b2006-01-13 18:05:50 -0600858{
Mike Christie30a6c652006-04-06 21:13:39 -0500859 struct Scsi_Host *shost = iscsi_session_to_shost(session);
Mike Christie26974782007-12-13 12:43:29 -0600860 unsigned long flags;
861 int err;
Mike Christie30a6c652006-04-06 21:13:39 -0500862
Mike Christie632248a2009-08-20 15:11:01 -0500863 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
864
Mike Christie26974782007-12-13 12:43:29 -0600865 spin_lock_irqsave(&sesslock, flags);
866 list_del(&session->sess_list);
867 spin_unlock_irqrestore(&sesslock, flags);
868
Mike Christie45ab33b2008-03-04 13:26:55 -0600869 /* make sure there are no blocks/unblocks queued */
870 flush_workqueue(iscsi_eh_timer_workq);
871 /* make sure the timedout callout is not running */
872 if (!cancel_delayed_work(&session->recovery_work))
873 flush_workqueue(iscsi_eh_timer_workq);
Mike Christie26974782007-12-13 12:43:29 -0600874 /*
875 * If we are blocked let commands flow again. The lld or iscsi
876 * layer should set up the queuecommand to fail commands.
Mike Christie45ab33b2008-03-04 13:26:55 -0600877 * We assume that LLD will not be calling block/unblock while
878 * removing the session.
Mike Christie26974782007-12-13 12:43:29 -0600879 */
Mike Christie6eabafb2008-01-31 13:36:43 -0600880 spin_lock_irqsave(&session->lock, flags);
881 session->state = ISCSI_SESSION_FREE;
882 spin_unlock_irqrestore(&session->lock, flags);
Mike Christiebd976f62008-01-31 13:36:46 -0600883
Mike Christie45ab33b2008-03-04 13:26:55 -0600884 scsi_target_unblock(&session->dev);
885 /* flush running scans then delete devices */
Mike Christie06d25af2009-03-05 14:46:02 -0600886 scsi_flush_work(shost);
Mike Christie45ab33b2008-03-04 13:26:55 -0600887 __iscsi_unbind_session(&session->unbind_work);
Mike Christie30a6c652006-04-06 21:13:39 -0500888
Mike Christie26974782007-12-13 12:43:29 -0600889 /* hw iscsi may not have removed all connections from session */
890 err = device_for_each_child(&session->dev, NULL,
891 iscsi_iter_destroy_conn_fn);
892 if (err)
Mike Christie322d7392008-01-31 13:36:52 -0600893 iscsi_cls_session_printk(KERN_ERR, session,
894 "Could not delete all connections "
895 "for session. Error %d.\n", err);
Mike Christie8434aa82006-06-28 12:00:30 -0500896
Mike Christie7b8631b2006-01-13 18:05:50 -0600897 transport_unregister_device(&session->dev);
Mike Christie632248a2009-08-20 15:11:01 -0500898
899 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
Mike Christie8434aa82006-06-28 12:00:30 -0500900 device_del(&session->dev);
901}
902EXPORT_SYMBOL_GPL(iscsi_remove_session);
903
904void iscsi_free_session(struct iscsi_cls_session *session)
905{
Mike Christie632248a2009-08-20 15:11:01 -0500906 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
Mike Christie26974782007-12-13 12:43:29 -0600907 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
Mike Christie8434aa82006-06-28 12:00:30 -0500908 put_device(&session->dev);
Mike Christie7b8631b2006-01-13 18:05:50 -0600909}
Mike Christie8434aa82006-06-28 12:00:30 -0500910EXPORT_SYMBOL_GPL(iscsi_free_session);
911
912/**
913 * iscsi_destroy_session - destroy iscsi session
914 * @session: iscsi_session
915 *
916 * Can be called by a LLD or iscsi_transport. There must not be
917 * any running connections.
Rob Landleyeb448202007-11-03 13:30:39 -0500918 */
Mike Christie8434aa82006-06-28 12:00:30 -0500919int iscsi_destroy_session(struct iscsi_cls_session *session)
920{
921 iscsi_remove_session(session);
Mike Christie632248a2009-08-20 15:11:01 -0500922 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
Mike Christie8434aa82006-06-28 12:00:30 -0500923 iscsi_free_session(session);
924 return 0;
925}
Mike Christie7b8631b2006-01-13 18:05:50 -0600926EXPORT_SYMBOL_GPL(iscsi_destroy_session);
927
Mike Christie7b8631b2006-01-13 18:05:50 -0600928/**
929 * iscsi_create_conn - create iscsi class connection
930 * @session: iscsi cls session
Mike Christie5d91e202008-05-21 15:54:01 -0500931 * @dd_size: private driver data size
Mike Christie7b8631b2006-01-13 18:05:50 -0600932 * @cid: connection id
933 *
934 * This can be called from a LLD or iscsi_transport. The connection
935 * is child of the session so cid must be unique for all connections
936 * on the session.
Mike Christieb5c7a122006-04-06 21:13:33 -0500937 *
938 * Since we do not support MCS, cid will normally be zero. In some cases
939 * for software iscsi we could be trying to preallocate a connection struct
940 * in which case there could be two connection structs and cid would be
941 * non-zero.
Rob Landleyeb448202007-11-03 13:30:39 -0500942 */
Mike Christie7b8631b2006-01-13 18:05:50 -0600943struct iscsi_cls_conn *
Mike Christie5d91e202008-05-21 15:54:01 -0500944iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
Mike Christie7b8631b2006-01-13 18:05:50 -0600945{
946 struct iscsi_transport *transport = session->transport;
Mike Christie7b8631b2006-01-13 18:05:50 -0600947 struct iscsi_cls_conn *conn;
Mike Christie26974782007-12-13 12:43:29 -0600948 unsigned long flags;
Mike Christie7b8631b2006-01-13 18:05:50 -0600949 int err;
950
Mike Christie5d91e202008-05-21 15:54:01 -0500951 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
Mike Christie7b8631b2006-01-13 18:05:50 -0600952 if (!conn)
953 return NULL;
Mike Christie5d91e202008-05-21 15:54:01 -0500954 if (dd_size)
Mike Christie7b8631b2006-01-13 18:05:50 -0600955 conn->dd_data = &conn[1];
956
957 INIT_LIST_HEAD(&conn->conn_list);
958 conn->transport = transport;
Mike Christieb5c7a122006-04-06 21:13:33 -0500959 conn->cid = cid;
Mike Christie7b8631b2006-01-13 18:05:50 -0600960
961 /* this is released in the dev's release function */
962 if (!get_device(&session->dev))
Mike Christie43a145a2006-10-16 18:09:38 -0400963 goto free_conn;
Mike Christieb5c7a122006-04-06 21:13:33 -0500964
Kay Sievers71610f52008-12-03 22:41:36 +0100965 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
Mike Christie7b8631b2006-01-13 18:05:50 -0600966 conn->dev.parent = &session->dev;
967 conn->dev.release = iscsi_conn_release;
968 err = device_register(&conn->dev);
969 if (err) {
Mike Christie322d7392008-01-31 13:36:52 -0600970 iscsi_cls_session_printk(KERN_ERR, session, "could not "
971 "register connection's dev\n");
Mike Christie7b8631b2006-01-13 18:05:50 -0600972 goto release_parent_ref;
973 }
974 transport_register_device(&conn->dev);
Mike Christie26974782007-12-13 12:43:29 -0600975
976 spin_lock_irqsave(&connlock, flags);
977 list_add(&conn->conn_list, &connlist);
978 conn->active = 1;
979 spin_unlock_irqrestore(&connlock, flags);
Mike Christie632248a2009-08-20 15:11:01 -0500980
981 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
Mike Christie7b8631b2006-01-13 18:05:50 -0600982 return conn;
983
984release_parent_ref:
985 put_device(&session->dev);
986free_conn:
987 kfree(conn);
988 return NULL;
989}
990
991EXPORT_SYMBOL_GPL(iscsi_create_conn);
992
993/**
994 * iscsi_destroy_conn - destroy iscsi class connection
Rob Landleyeb448202007-11-03 13:30:39 -0500995 * @conn: iscsi cls session
Mike Christie7b8631b2006-01-13 18:05:50 -0600996 *
Mike Christie26974782007-12-13 12:43:29 -0600997 * This can be called from a LLD or iscsi_transport.
Rob Landleyeb448202007-11-03 13:30:39 -0500998 */
Mike Christie7b8631b2006-01-13 18:05:50 -0600999int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1000{
Mike Christie26974782007-12-13 12:43:29 -06001001 unsigned long flags;
1002
1003 spin_lock_irqsave(&connlock, flags);
1004 conn->active = 0;
1005 list_del(&conn->conn_list);
1006 spin_unlock_irqrestore(&connlock, flags);
1007
Mike Christie7b8631b2006-01-13 18:05:50 -06001008 transport_unregister_device(&conn->dev);
Mike Christie632248a2009-08-20 15:11:01 -05001009 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
Mike Christie7b8631b2006-01-13 18:05:50 -06001010 device_unregister(&conn->dev);
1011 return 0;
1012}
Mike Christie7b8631b2006-01-13 18:05:50 -06001013EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1014
1015/*
Mike Christie7b8631b2006-01-13 18:05:50 -06001016 * iscsi interface functions
1017 */
Alex Aizman0896b752005-08-04 19:33:07 -07001018static struct iscsi_internal *
1019iscsi_if_transport_lookup(struct iscsi_transport *tt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020{
Alex Aizman0896b752005-08-04 19:33:07 -07001021 struct iscsi_internal *priv;
1022 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Alex Aizman0896b752005-08-04 19:33:07 -07001024 spin_lock_irqsave(&iscsi_transport_lock, flags);
1025 list_for_each_entry(priv, &iscsi_transports, list) {
1026 if (tt == priv->iscsi_transport) {
1027 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1028 return priv;
1029 }
1030 }
1031 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1032 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Alex Aizman0896b752005-08-04 19:33:07 -07001035static int
Michael Chan43514772009-06-08 18:14:41 -07001036iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
Mike Christie53cb8a12006-06-28 12:00:32 -05001037{
Michael Chan43514772009-06-08 18:14:41 -07001038 return nlmsg_multicast(nls, skb, 0, group, gfp);
Alex Aizman0896b752005-08-04 19:33:07 -07001039}
1040
Mike Christie7b7232f2006-02-01 21:06:49 -06001041int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
Alex Aizman0896b752005-08-04 19:33:07 -07001042 char *data, uint32_t data_size)
1043{
1044 struct nlmsghdr *nlh;
1045 struct sk_buff *skb;
1046 struct iscsi_uevent *ev;
Alex Aizman0896b752005-08-04 19:33:07 -07001047 char *pdu;
Mike Christie790f39a2006-05-18 20:31:39 -05001048 struct iscsi_internal *priv;
Alex Aizman0896b752005-08-04 19:33:07 -07001049 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1050 data_size);
1051
Mike Christie790f39a2006-05-18 20:31:39 -05001052 priv = iscsi_if_transport_lookup(conn->transport);
1053 if (!priv)
1054 return -EINVAL;
1055
Mike Christie43a145a2006-10-16 18:09:38 -04001056 skb = alloc_skb(len, GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001057 if (!skb) {
Mike Christiee5bd7b52008-09-24 11:46:10 -05001058 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
Mike Christie322d7392008-01-31 13:36:52 -06001059 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1060 "control PDU: OOM\n");
Alex Aizman0896b752005-08-04 19:33:07 -07001061 return -ENOMEM;
1062 }
1063
Michael Chan43514772009-06-08 18:14:41 -07001064 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
Alex Aizman0896b752005-08-04 19:33:07 -07001065 ev = NLMSG_DATA(nlh);
1066 memset(ev, 0, sizeof(*ev));
1067 ev->transport_handle = iscsi_handle(conn->transport);
1068 ev->type = ISCSI_KEVENT_RECV_PDU;
Mike Christieb5c7a122006-04-06 21:13:33 -05001069 ev->r.recv_req.cid = conn->cid;
1070 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
Alex Aizman0896b752005-08-04 19:33:07 -07001071 pdu = (char*)ev + sizeof(*ev);
1072 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1073 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1074
Michael Chan43514772009-06-08 18:14:41 -07001075 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001076}
1077EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1078
Michael Chan43514772009-06-08 18:14:41 -07001079int iscsi_offload_mesg(struct Scsi_Host *shost,
1080 struct iscsi_transport *transport, uint32_t type,
1081 char *data, uint16_t data_size)
1082{
1083 struct nlmsghdr *nlh;
1084 struct sk_buff *skb;
1085 struct iscsi_uevent *ev;
1086 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1087
Michael Chana541f842009-07-29 08:49:52 +00001088 skb = alloc_skb(len, GFP_ATOMIC);
Michael Chan43514772009-06-08 18:14:41 -07001089 if (!skb) {
1090 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1091 return -ENOMEM;
1092 }
1093
1094 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1095 ev = NLMSG_DATA(nlh);
1096 memset(ev, 0, sizeof(*ev));
1097 ev->type = type;
1098 ev->transport_handle = iscsi_handle(transport);
1099 switch (type) {
1100 case ISCSI_KEVENT_PATH_REQ:
1101 ev->r.req_path.host_no = shost->host_no;
1102 break;
1103 case ISCSI_KEVENT_IF_DOWN:
1104 ev->r.notify_if_down.host_no = shost->host_no;
1105 break;
1106 }
1107
1108 memcpy((char *)ev + sizeof(*ev), data, data_size);
1109
Michael Chana541f842009-07-29 08:49:52 +00001110 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
Michael Chan43514772009-06-08 18:14:41 -07001111}
1112EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1113
Mike Christiee5bd7b52008-09-24 11:46:10 -05001114void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
Alex Aizman0896b752005-08-04 19:33:07 -07001115{
1116 struct nlmsghdr *nlh;
1117 struct sk_buff *skb;
1118 struct iscsi_uevent *ev;
Mike Christie790f39a2006-05-18 20:31:39 -05001119 struct iscsi_internal *priv;
Alex Aizman0896b752005-08-04 19:33:07 -07001120 int len = NLMSG_SPACE(sizeof(*ev));
1121
Mike Christie790f39a2006-05-18 20:31:39 -05001122 priv = iscsi_if_transport_lookup(conn->transport);
1123 if (!priv)
1124 return;
1125
Mike Christie43a145a2006-10-16 18:09:38 -04001126 skb = alloc_skb(len, GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001127 if (!skb) {
Mike Christie322d7392008-01-31 13:36:52 -06001128 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1129 "conn error (%d)\n", error);
Alex Aizman0896b752005-08-04 19:33:07 -07001130 return;
1131 }
1132
Michael Chan43514772009-06-08 18:14:41 -07001133 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
Alex Aizman0896b752005-08-04 19:33:07 -07001134 ev = NLMSG_DATA(nlh);
1135 ev->transport_handle = iscsi_handle(conn->transport);
1136 ev->type = ISCSI_KEVENT_CONN_ERROR;
Alex Aizman0896b752005-08-04 19:33:07 -07001137 ev->r.connerror.error = error;
Mike Christieb5c7a122006-04-06 21:13:33 -05001138 ev->r.connerror.cid = conn->cid;
1139 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
Alex Aizman0896b752005-08-04 19:33:07 -07001140
Michael Chan43514772009-06-08 18:14:41 -07001141 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001142
Mike Christie322d7392008-01-31 13:36:52 -06001143 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1144 error);
Alex Aizman0896b752005-08-04 19:33:07 -07001145}
Mike Christiee5bd7b52008-09-24 11:46:10 -05001146EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
Alex Aizman0896b752005-08-04 19:33:07 -07001147
1148static int
Michael Chan43514772009-06-08 18:14:41 -07001149iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1150 void *payload, int size)
Alex Aizman0896b752005-08-04 19:33:07 -07001151{
1152 struct sk_buff *skb;
1153 struct nlmsghdr *nlh;
1154 int len = NLMSG_SPACE(size);
1155 int flags = multi ? NLM_F_MULTI : 0;
1156 int t = done ? NLMSG_DONE : type;
1157
Mike Christie43a145a2006-10-16 18:09:38 -04001158 skb = alloc_skb(len, GFP_ATOMIC);
Mike Christie239a7dc2007-05-30 12:57:07 -05001159 if (!skb) {
1160 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1161 return -ENOMEM;
1162 }
Alex Aizman0896b752005-08-04 19:33:07 -07001163
Michael Chan43514772009-06-08 18:14:41 -07001164 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
Alex Aizman0896b752005-08-04 19:33:07 -07001165 nlh->nlmsg_flags = flags;
1166 memcpy(NLMSG_DATA(nlh), payload, size);
Michael Chan43514772009-06-08 18:14:41 -07001167 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001168}
1169
1170static int
Mike Christie5b940ad2006-02-01 21:06:56 -06001171iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
Alex Aizman0896b752005-08-04 19:33:07 -07001172{
1173 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1174 struct iscsi_stats *stats;
1175 struct sk_buff *skbstat;
Mike Christie7b8631b2006-01-13 18:05:50 -06001176 struct iscsi_cls_conn *conn;
Alex Aizman0896b752005-08-04 19:33:07 -07001177 struct nlmsghdr *nlhstat;
1178 struct iscsi_uevent *evstat;
Mike Christie790f39a2006-05-18 20:31:39 -05001179 struct iscsi_internal *priv;
Alex Aizman0896b752005-08-04 19:33:07 -07001180 int len = NLMSG_SPACE(sizeof(*ev) +
1181 sizeof(struct iscsi_stats) +
1182 sizeof(struct iscsi_stats_custom) *
1183 ISCSI_STATS_CUSTOM_MAX);
1184 int err = 0;
1185
Mike Christie790f39a2006-05-18 20:31:39 -05001186 priv = iscsi_if_transport_lookup(transport);
1187 if (!priv)
1188 return -EINVAL;
1189
Mike Christieb5c7a122006-04-06 21:13:33 -05001190 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
Alex Aizman0896b752005-08-04 19:33:07 -07001191 if (!conn)
1192 return -EEXIST;
1193
1194 do {
1195 int actual_size;
1196
Mike Christie43a145a2006-10-16 18:09:38 -04001197 skbstat = alloc_skb(len, GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001198 if (!skbstat) {
Mike Christie322d7392008-01-31 13:36:52 -06001199 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1200 "deliver stats: OOM\n");
Alex Aizman0896b752005-08-04 19:33:07 -07001201 return -ENOMEM;
1202 }
1203
Michael Chan43514772009-06-08 18:14:41 -07001204 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
Alex Aizman0896b752005-08-04 19:33:07 -07001205 (len - sizeof(*nlhstat)), 0);
1206 evstat = NLMSG_DATA(nlhstat);
1207 memset(evstat, 0, sizeof(*evstat));
1208 evstat->transport_handle = iscsi_handle(conn->transport);
1209 evstat->type = nlh->nlmsg_type;
Mike Christieb5c7a122006-04-06 21:13:33 -05001210 evstat->u.get_stats.cid =
1211 ev->u.get_stats.cid;
1212 evstat->u.get_stats.sid =
1213 ev->u.get_stats.sid;
Alex Aizman0896b752005-08-04 19:33:07 -07001214 stats = (struct iscsi_stats *)
1215 ((char*)evstat + sizeof(*evstat));
1216 memset(stats, 0, sizeof(*stats));
1217
Mike Christie7b7232f2006-02-01 21:06:49 -06001218 transport->get_stats(conn, stats);
Alex Aizman0896b752005-08-04 19:33:07 -07001219 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1220 sizeof(struct iscsi_stats) +
1221 sizeof(struct iscsi_stats_custom) *
1222 stats->custom_length);
1223 actual_size -= sizeof(*nlhstat);
1224 actual_size = NLMSG_LENGTH(actual_size);
Mike Christie5b940ad2006-02-01 21:06:56 -06001225 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
Alex Aizman0896b752005-08-04 19:33:07 -07001226 nlhstat->nlmsg_len = actual_size;
1227
Michael Chan43514772009-06-08 18:14:41 -07001228 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1229 GFP_ATOMIC);
Alex Aizman0896b752005-08-04 19:33:07 -07001230 } while (err < 0 && err != -ECONNREFUSED);
1231
1232 return err;
1233}
1234
Mike Christie53cb8a12006-06-28 12:00:32 -05001235/**
Mike Christie26974782007-12-13 12:43:29 -06001236 * iscsi_session_event - send session destr. completion event
1237 * @session: iscsi class session
1238 * @event: type of event
Rob Landleyeb448202007-11-03 13:30:39 -05001239 */
Mike Christie26974782007-12-13 12:43:29 -06001240int iscsi_session_event(struct iscsi_cls_session *session,
1241 enum iscsi_uevent_e event)
Mike Christie53cb8a12006-06-28 12:00:32 -05001242{
1243 struct iscsi_internal *priv;
Mike Christie53cb8a12006-06-28 12:00:32 -05001244 struct Scsi_Host *shost;
1245 struct iscsi_uevent *ev;
1246 struct sk_buff *skb;
1247 struct nlmsghdr *nlh;
Mike Christie53cb8a12006-06-28 12:00:32 -05001248 int rc, len = NLMSG_SPACE(sizeof(*ev));
1249
Mike Christie26974782007-12-13 12:43:29 -06001250 priv = iscsi_if_transport_lookup(session->transport);
Mike Christie53cb8a12006-06-28 12:00:32 -05001251 if (!priv)
1252 return -EINVAL;
Mike Christie53cb8a12006-06-28 12:00:32 -05001253 shost = iscsi_session_to_shost(session);
1254
Mike Christie43a145a2006-10-16 18:09:38 -04001255 skb = alloc_skb(len, GFP_KERNEL);
Mike Christie53cb8a12006-06-28 12:00:32 -05001256 if (!skb) {
Mike Christie322d7392008-01-31 13:36:52 -06001257 iscsi_cls_session_printk(KERN_ERR, session,
1258 "Cannot notify userspace of session "
1259 "event %u\n", event);
Mike Christie53cb8a12006-06-28 12:00:32 -05001260 return -ENOMEM;
1261 }
1262
Michael Chan43514772009-06-08 18:14:41 -07001263 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
Mike Christie53cb8a12006-06-28 12:00:32 -05001264 ev = NLMSG_DATA(nlh);
Mike Christie26974782007-12-13 12:43:29 -06001265 ev->transport_handle = iscsi_handle(session->transport);
1266
1267 ev->type = event;
1268 switch (event) {
1269 case ISCSI_KEVENT_DESTROY_SESSION:
1270 ev->r.d_session.host_no = shost->host_no;
1271 ev->r.d_session.sid = session->sid;
1272 break;
1273 case ISCSI_KEVENT_CREATE_SESSION:
1274 ev->r.c_session_ret.host_no = shost->host_no;
1275 ev->r.c_session_ret.sid = session->sid;
1276 break;
1277 case ISCSI_KEVENT_UNBIND_SESSION:
1278 ev->r.unbind_session.host_no = shost->host_no;
1279 ev->r.unbind_session.sid = session->sid;
1280 break;
1281 default:
Mike Christie322d7392008-01-31 13:36:52 -06001282 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1283 "%u.\n", event);
Mike Christie26974782007-12-13 12:43:29 -06001284 kfree_skb(skb);
1285 return -EINVAL;
1286 }
Mike Christie53cb8a12006-06-28 12:00:32 -05001287
1288 /*
1289 * this will occur if the daemon is not up, so we just warn
1290 * the user and when the daemon is restarted it will handle it
1291 */
Michael Chan43514772009-06-08 18:14:41 -07001292 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
Pablo Neira Ayusoff491a72009-02-05 23:56:36 -08001293 if (rc == -ESRCH)
Mike Christie322d7392008-01-31 13:36:52 -06001294 iscsi_cls_session_printk(KERN_ERR, session,
1295 "Cannot notify userspace of session "
1296 "event %u. Check iscsi daemon\n",
1297 event);
Mike Christie632248a2009-08-20 15:11:01 -05001298
1299 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1300 event, rc);
Mike Christie53cb8a12006-06-28 12:00:32 -05001301 return rc;
1302}
Mike Christie26974782007-12-13 12:43:29 -06001303EXPORT_SYMBOL_GPL(iscsi_session_event);
Mike Christie53cb8a12006-06-28 12:00:32 -05001304
Alex Aizman0896b752005-08-04 19:33:07 -07001305static int
Mike Christied82ff9be2008-05-21 15:54:13 -05001306iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1307 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
Mike Christie40753ca2008-05-21 15:53:56 -05001308 uint16_t cmds_max, uint16_t queue_depth)
Mike Christie7b8631b2006-01-13 18:05:50 -06001309{
1310 struct iscsi_transport *transport = priv->iscsi_transport;
Mike Christie7b7232f2006-02-01 21:06:49 -06001311 struct iscsi_cls_session *session;
Mike Christie5e7facb2009-03-05 14:46:06 -06001312 struct Scsi_Host *shost;
Mike Christie7b8631b2006-01-13 18:05:50 -06001313
Mike Christied82ff9be2008-05-21 15:54:13 -05001314 session = transport->create_session(ep, cmds_max, queue_depth,
Mike Christie5e7facb2009-03-05 14:46:06 -06001315 initial_cmdsn);
Mike Christie7b7232f2006-02-01 21:06:49 -06001316 if (!session)
Mike Christie7b8631b2006-01-13 18:05:50 -06001317 return -ENOMEM;
1318
Mike Christie5e7facb2009-03-05 14:46:06 -06001319 shost = iscsi_session_to_shost(session);
1320 ev->r.c_session_ret.host_no = shost->host_no;
Mike Christieb5c7a122006-04-06 21:13:33 -05001321 ev->r.c_session_ret.sid = session->sid;
Mike Christie632248a2009-08-20 15:11:01 -05001322 ISCSI_DBG_TRANS_SESSION(session,
1323 "Completed creating transport session\n");
Mike Christie7b8631b2006-01-13 18:05:50 -06001324 return 0;
1325}
1326
1327static int
Mike Christie7b7232f2006-02-01 21:06:49 -06001328iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
Mike Christie7b8631b2006-01-13 18:05:50 -06001329{
Mike Christie7b8631b2006-01-13 18:05:50 -06001330 struct iscsi_cls_conn *conn;
Mike Christie7b7232f2006-02-01 21:06:49 -06001331 struct iscsi_cls_session *session;
Mike Christie7b8631b2006-01-13 18:05:50 -06001332
Mike Christieb5c7a122006-04-06 21:13:33 -05001333 session = iscsi_session_lookup(ev->u.c_conn.sid);
1334 if (!session) {
Mike Christie322d7392008-01-31 13:36:52 -06001335 printk(KERN_ERR "iscsi: invalid session %d.\n",
Mike Christieb5c7a122006-04-06 21:13:33 -05001336 ev->u.c_conn.sid);
Mike Christie7b8631b2006-01-13 18:05:50 -06001337 return -EINVAL;
Mike Christieb5c7a122006-04-06 21:13:33 -05001338 }
Mike Christie7b8631b2006-01-13 18:05:50 -06001339
Mike Christie7b7232f2006-02-01 21:06:49 -06001340 conn = transport->create_conn(session, ev->u.c_conn.cid);
Mike Christieb5c7a122006-04-06 21:13:33 -05001341 if (!conn) {
Mike Christie322d7392008-01-31 13:36:52 -06001342 iscsi_cls_session_printk(KERN_ERR, session,
1343 "couldn't create a new connection.");
Mike Christie7b7232f2006-02-01 21:06:49 -06001344 return -ENOMEM;
Mike Christieb5c7a122006-04-06 21:13:33 -05001345 }
Mike Christie7b8631b2006-01-13 18:05:50 -06001346
Mike Christieb5c7a122006-04-06 21:13:33 -05001347 ev->r.c_conn_ret.sid = session->sid;
1348 ev->r.c_conn_ret.cid = conn->cid;
Mike Christie632248a2009-08-20 15:11:01 -05001349
1350 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
Mike Christie7b8631b2006-01-13 18:05:50 -06001351 return 0;
Mike Christie7b8631b2006-01-13 18:05:50 -06001352}
1353
1354static int
1355iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1356{
Mike Christie7b8631b2006-01-13 18:05:50 -06001357 struct iscsi_cls_conn *conn;
Mike Christie7b8631b2006-01-13 18:05:50 -06001358
Mike Christieb5c7a122006-04-06 21:13:33 -05001359 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
Mike Christie7b8631b2006-01-13 18:05:50 -06001360 if (!conn)
Mike Christie7b8631b2006-01-13 18:05:50 -06001361 return -EINVAL;
Mike Christie7b8631b2006-01-13 18:05:50 -06001362
Mike Christie632248a2009-08-20 15:11:01 -05001363 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
Mike Christie7b8631b2006-01-13 18:05:50 -06001364 if (transport->destroy_conn)
1365 transport->destroy_conn(conn);
Mike Christie632248a2009-08-20 15:11:01 -05001366
Mike Christie7b8631b2006-01-13 18:05:50 -06001367 return 0;
1368}
1369
Mike Christiefd7255f2006-04-06 21:13:36 -05001370static int
1371iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1372{
1373 char *data = (char*)ev + sizeof(*ev);
1374 struct iscsi_cls_conn *conn;
1375 struct iscsi_cls_session *session;
Mike Christiea54a52c2006-06-28 12:00:23 -05001376 int err = 0, value = 0;
Mike Christiefd7255f2006-04-06 21:13:36 -05001377
1378 session = iscsi_session_lookup(ev->u.set_param.sid);
1379 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1380 if (!conn || !session)
1381 return -EINVAL;
1382
1383 switch (ev->u.set_param.param) {
Mike Christie30a6c652006-04-06 21:13:39 -05001384 case ISCSI_PARAM_SESS_RECOVERY_TMO:
Mike Christiea54a52c2006-06-28 12:00:23 -05001385 sscanf(data, "%d", &value);
Mike Christiefdd46dc2009-11-11 16:34:34 -06001386 session->recovery_tmo = value;
Mike Christie30a6c652006-04-06 21:13:39 -05001387 break;
Mike Christiefd7255f2006-04-06 21:13:36 -05001388 default:
Mike Christiea54a52c2006-06-28 12:00:23 -05001389 err = transport->set_param(conn, ev->u.set_param.param,
1390 data, ev->u.set_param.len);
Mike Christiefd7255f2006-04-06 21:13:36 -05001391 }
1392
1393 return err;
1394}
1395
Mike Christie10eb0f02009-05-13 17:57:38 -05001396static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1397 struct iscsi_uevent *ev, int msg_type)
1398{
1399 struct iscsi_endpoint *ep;
1400 struct sockaddr *dst_addr;
1401 struct Scsi_Host *shost = NULL;
1402 int non_blocking, err = 0;
1403
1404 if (!transport->ep_connect)
1405 return -EINVAL;
1406
1407 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1408 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1409 if (!shost) {
1410 printk(KERN_ERR "ep connect failed. Could not find "
1411 "host no %u\n",
1412 ev->u.ep_connect_through_host.host_no);
1413 return -ENODEV;
1414 }
1415 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1416 } else
1417 non_blocking = ev->u.ep_connect.non_blocking;
1418
1419 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1420 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1421 if (IS_ERR(ep)) {
1422 err = PTR_ERR(ep);
1423 goto release_host;
1424 }
1425
1426 ev->r.ep_connect_ret.handle = ep->id;
1427release_host:
1428 if (shost)
1429 scsi_host_put(shost);
1430 return err;
1431}
1432
Mike Christie7b8631b2006-01-13 18:05:50 -06001433static int
Or Gerlitz264faaa2006-05-02 19:46:36 -05001434iscsi_if_transport_ep(struct iscsi_transport *transport,
1435 struct iscsi_uevent *ev, int msg_type)
1436{
Mike Christied82ff9be2008-05-21 15:54:13 -05001437 struct iscsi_endpoint *ep;
Or Gerlitz264faaa2006-05-02 19:46:36 -05001438 int rc = 0;
1439
1440 switch (msg_type) {
Mike Christie10eb0f02009-05-13 17:57:38 -05001441 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
Or Gerlitz264faaa2006-05-02 19:46:36 -05001442 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
Mike Christie10eb0f02009-05-13 17:57:38 -05001443 rc = iscsi_if_ep_connect(transport, ev, msg_type);
Or Gerlitz264faaa2006-05-02 19:46:36 -05001444 break;
1445 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1446 if (!transport->ep_poll)
1447 return -EINVAL;
1448
Mike Christied82ff9be2008-05-21 15:54:13 -05001449 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1450 if (!ep)
1451 return -EINVAL;
1452
1453 ev->r.retcode = transport->ep_poll(ep,
Or Gerlitz264faaa2006-05-02 19:46:36 -05001454 ev->u.ep_poll.timeout_ms);
1455 break;
1456 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1457 if (!transport->ep_disconnect)
1458 return -EINVAL;
1459
Mike Christied82ff9be2008-05-21 15:54:13 -05001460 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1461 if (!ep)
1462 return -EINVAL;
1463
1464 transport->ep_disconnect(ep);
Or Gerlitz264faaa2006-05-02 19:46:36 -05001465 break;
1466 }
1467 return rc;
1468}
1469
1470static int
Mike Christie01cb2252006-06-28 12:00:22 -05001471iscsi_tgt_dscvr(struct iscsi_transport *transport,
1472 struct iscsi_uevent *ev)
1473{
Mike Christie2174a042007-05-30 12:57:10 -05001474 struct Scsi_Host *shost;
Mike Christie01cb2252006-06-28 12:00:22 -05001475 struct sockaddr *dst_addr;
Mike Christie2174a042007-05-30 12:57:10 -05001476 int err;
Mike Christie01cb2252006-06-28 12:00:22 -05001477
1478 if (!transport->tgt_dscvr)
1479 return -EINVAL;
1480
Mike Christie2174a042007-05-30 12:57:10 -05001481 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
James Smart315cb0a2008-08-07 20:49:30 -04001482 if (!shost) {
Mike Christie2174a042007-05-30 12:57:10 -05001483 printk(KERN_ERR "target discovery could not find host no %u\n",
1484 ev->u.tgt_dscvr.host_no);
1485 return -ENODEV;
1486 }
1487
1488
Mike Christie01cb2252006-06-28 12:00:22 -05001489 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
Mike Christie2174a042007-05-30 12:57:10 -05001490 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1491 ev->u.tgt_dscvr.enable, dst_addr);
1492 scsi_host_put(shost);
1493 return err;
Mike Christie01cb2252006-06-28 12:00:22 -05001494}
1495
1496static int
Mike Christie1d9bf132007-05-30 12:57:11 -05001497iscsi_set_host_param(struct iscsi_transport *transport,
1498 struct iscsi_uevent *ev)
1499{
1500 char *data = (char*)ev + sizeof(*ev);
1501 struct Scsi_Host *shost;
1502 int err;
1503
1504 if (!transport->set_host_param)
1505 return -ENOSYS;
1506
1507 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
James Smart315cb0a2008-08-07 20:49:30 -04001508 if (!shost) {
Mike Christie1d9bf132007-05-30 12:57:11 -05001509 printk(KERN_ERR "set_host_param could not find host no %u\n",
1510 ev->u.set_host_param.host_no);
1511 return -ENODEV;
1512 }
1513
1514 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1515 data, ev->u.set_host_param.len);
1516 scsi_host_put(shost);
1517 return err;
1518}
1519
1520static int
Michael Chan43514772009-06-08 18:14:41 -07001521iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1522{
1523 struct Scsi_Host *shost;
1524 struct iscsi_path *params;
1525 int err;
1526
1527 if (!transport->set_path)
1528 return -ENOSYS;
1529
1530 shost = scsi_host_lookup(ev->u.set_path.host_no);
1531 if (!shost) {
1532 printk(KERN_ERR "set path could not find host no %u\n",
1533 ev->u.set_path.host_no);
1534 return -ENODEV;
1535 }
1536
1537 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1538 err = transport->set_path(shost, params);
1539
1540 scsi_host_put(shost);
1541 return err;
1542}
1543
1544static int
1545iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
Alex Aizman0896b752005-08-04 19:33:07 -07001546{
1547 int err = 0;
1548 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1549 struct iscsi_transport *transport = NULL;
1550 struct iscsi_internal *priv;
Mike Christie7b7232f2006-02-01 21:06:49 -06001551 struct iscsi_cls_session *session;
1552 struct iscsi_cls_conn *conn;
Mike Christied82ff9be2008-05-21 15:54:13 -05001553 struct iscsi_endpoint *ep = NULL;
Alex Aizman0896b752005-08-04 19:33:07 -07001554
Michael Chan43514772009-06-08 18:14:41 -07001555 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1556 *group = ISCSI_NL_GRP_UIP;
1557 else
1558 *group = ISCSI_NL_GRP_ISCSID;
1559
Alex Aizman0896b752005-08-04 19:33:07 -07001560 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1561 if (!priv)
1562 return -EINVAL;
1563 transport = priv->iscsi_transport;
1564
Mike Christie7b7232f2006-02-01 21:06:49 -06001565 if (!try_module_get(transport->owner))
1566 return -EINVAL;
1567
Alex Aizman0896b752005-08-04 19:33:07 -07001568 switch (nlh->nlmsg_type) {
1569 case ISCSI_UEVENT_CREATE_SESSION:
Mike Christied82ff9be2008-05-21 15:54:13 -05001570 err = iscsi_if_create_session(priv, ep, ev,
Mike Christie40753ca2008-05-21 15:53:56 -05001571 ev->u.c_session.initial_cmdsn,
1572 ev->u.c_session.cmds_max,
1573 ev->u.c_session.queue_depth);
1574 break;
1575 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
Mike Christied82ff9be2008-05-21 15:54:13 -05001576 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
Mike Christiec95fddc2008-06-16 10:11:32 -05001577 if (!ep) {
1578 err = -EINVAL;
1579 break;
1580 }
Mike Christied82ff9be2008-05-21 15:54:13 -05001581
1582 err = iscsi_if_create_session(priv, ep, ev,
Mike Christie40753ca2008-05-21 15:53:56 -05001583 ev->u.c_bound_session.initial_cmdsn,
1584 ev->u.c_bound_session.cmds_max,
1585 ev->u.c_bound_session.queue_depth);
Alex Aizman0896b752005-08-04 19:33:07 -07001586 break;
1587 case ISCSI_UEVENT_DESTROY_SESSION:
Mike Christieb5c7a122006-04-06 21:13:33 -05001588 session = iscsi_session_lookup(ev->u.d_session.sid);
Mike Christie26974782007-12-13 12:43:29 -06001589 if (session)
Mike Christie7b7232f2006-02-01 21:06:49 -06001590 transport->destroy_session(session);
Mike Christie26974782007-12-13 12:43:29 -06001591 else
1592 err = -EINVAL;
1593 break;
1594 case ISCSI_UEVENT_UNBIND_SESSION:
1595 session = iscsi_session_lookup(ev->u.d_session.sid);
1596 if (session)
Mike Christie06d25af2009-03-05 14:46:02 -06001597 scsi_queue_work(iscsi_session_to_shost(session),
1598 &session->unbind_work);
Mike Christie26974782007-12-13 12:43:29 -06001599 else
Mike Christie7b7232f2006-02-01 21:06:49 -06001600 err = -EINVAL;
Alex Aizman0896b752005-08-04 19:33:07 -07001601 break;
1602 case ISCSI_UEVENT_CREATE_CONN:
1603 err = iscsi_if_create_conn(transport, ev);
1604 break;
1605 case ISCSI_UEVENT_DESTROY_CONN:
1606 err = iscsi_if_destroy_conn(transport, ev);
1607 break;
1608 case ISCSI_UEVENT_BIND_CONN:
Mike Christieb5c7a122006-04-06 21:13:33 -05001609 session = iscsi_session_lookup(ev->u.b_conn.sid);
1610 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
Mike Christie7b7232f2006-02-01 21:06:49 -06001611
1612 if (session && conn)
1613 ev->r.retcode = transport->bind_conn(session, conn,
Or Gerlitz264faaa2006-05-02 19:46:36 -05001614 ev->u.b_conn.transport_eph,
Mike Christie7b7232f2006-02-01 21:06:49 -06001615 ev->u.b_conn.is_leading);
1616 else
1617 err = -EINVAL;
Alex Aizman0896b752005-08-04 19:33:07 -07001618 break;
1619 case ISCSI_UEVENT_SET_PARAM:
Mike Christiefd7255f2006-04-06 21:13:36 -05001620 err = iscsi_set_param(transport, ev);
Alex Aizman0896b752005-08-04 19:33:07 -07001621 break;
1622 case ISCSI_UEVENT_START_CONN:
Mike Christieb5c7a122006-04-06 21:13:33 -05001623 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
Mike Christie7b7232f2006-02-01 21:06:49 -06001624 if (conn)
1625 ev->r.retcode = transport->start_conn(conn);
1626 else
1627 err = -EINVAL;
Alex Aizman0896b752005-08-04 19:33:07 -07001628 break;
1629 case ISCSI_UEVENT_STOP_CONN:
Mike Christieb5c7a122006-04-06 21:13:33 -05001630 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
Mike Christie7b7232f2006-02-01 21:06:49 -06001631 if (conn)
1632 transport->stop_conn(conn, ev->u.stop_conn.flag);
1633 else
1634 err = -EINVAL;
Alex Aizman0896b752005-08-04 19:33:07 -07001635 break;
1636 case ISCSI_UEVENT_SEND_PDU:
Mike Christieb5c7a122006-04-06 21:13:33 -05001637 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
Mike Christie7b7232f2006-02-01 21:06:49 -06001638 if (conn)
1639 ev->r.retcode = transport->send_pdu(conn,
1640 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1641 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1642 ev->u.send_pdu.data_size);
1643 else
1644 err = -EINVAL;
Alex Aizman0896b752005-08-04 19:33:07 -07001645 break;
1646 case ISCSI_UEVENT_GET_STATS:
Mike Christie5b940ad2006-02-01 21:06:56 -06001647 err = iscsi_if_get_stats(transport, nlh);
Alex Aizman0896b752005-08-04 19:33:07 -07001648 break;
Or Gerlitz264faaa2006-05-02 19:46:36 -05001649 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1650 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1651 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
Mike Christie10eb0f02009-05-13 17:57:38 -05001652 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
Or Gerlitz264faaa2006-05-02 19:46:36 -05001653 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1654 break;
Mike Christie01cb2252006-06-28 12:00:22 -05001655 case ISCSI_UEVENT_TGT_DSCVR:
1656 err = iscsi_tgt_dscvr(transport, ev);
1657 break;
Mike Christie1d9bf132007-05-30 12:57:11 -05001658 case ISCSI_UEVENT_SET_HOST_PARAM:
1659 err = iscsi_set_host_param(transport, ev);
1660 break;
Michael Chan43514772009-06-08 18:14:41 -07001661 case ISCSI_UEVENT_PATH_UPDATE:
1662 err = iscsi_set_path(transport, ev);
1663 break;
Alex Aizman0896b752005-08-04 19:33:07 -07001664 default:
Mike Christie1d9bf132007-05-30 12:57:11 -05001665 err = -ENOSYS;
Alex Aizman0896b752005-08-04 19:33:07 -07001666 break;
1667 }
1668
Mike Christie7b7232f2006-02-01 21:06:49 -06001669 module_put(transport->owner);
Alex Aizman0896b752005-08-04 19:33:07 -07001670 return err;
1671}
1672
Mike Christieb5c7a122006-04-06 21:13:33 -05001673/*
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001674 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1675 * Malformed skbs with wrong lengths or invalid creds are not processed.
Mike Christieb5c7a122006-04-06 21:13:33 -05001676 */
Alex Aizman0896b752005-08-04 19:33:07 -07001677static void
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001678iscsi_if_rx(struct sk_buff *skb)
Alex Aizman0896b752005-08-04 19:33:07 -07001679{
Arjan van de Ven0b950672006-01-11 13:16:10 +01001680 mutex_lock(&rx_queue_mutex);
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001681 while (skb->len >= NLMSG_SPACE(0)) {
1682 int err;
1683 uint32_t rlen;
1684 struct nlmsghdr *nlh;
1685 struct iscsi_uevent *ev;
Michael Chan43514772009-06-08 18:14:41 -07001686 uint32_t group;
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001687
1688 nlh = nlmsg_hdr(skb);
1689 if (nlh->nlmsg_len < sizeof(*nlh) ||
1690 skb->len < nlh->nlmsg_len) {
1691 break;
Mike Christieee7f8e42006-02-01 21:07:01 -06001692 }
Mike Christieee7f8e42006-02-01 21:07:01 -06001693
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001694 ev = NLMSG_DATA(nlh);
1695 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1696 if (rlen > skb->len)
1697 rlen = skb->len;
Alex Aizman0896b752005-08-04 19:33:07 -07001698
Michael Chan43514772009-06-08 18:14:41 -07001699 err = iscsi_if_recv_msg(skb, nlh, &group);
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001700 if (err) {
1701 ev->type = ISCSI_KEVENT_IF_ERROR;
1702 ev->iferror = err;
1703 }
1704 do {
1705 /*
1706 * special case for GET_STATS:
1707 * on success - sending reply and stats from
1708 * inside of if_recv_msg(),
1709 * on error - fall through.
1710 */
1711 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
Alex Aizman0896b752005-08-04 19:33:07 -07001712 break;
Michael Chan43514772009-06-08 18:14:41 -07001713 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001714 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1715 } while (err < 0 && err != -ECONNREFUSED);
1716 skb_pull(skb, rlen);
Alex Aizman0896b752005-08-04 19:33:07 -07001717 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001718 mutex_unlock(&rx_queue_mutex);
Alex Aizman0896b752005-08-04 19:33:07 -07001719}
1720
Mike Christiefd7255f2006-04-06 21:13:36 -05001721#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
Tony Jonesee959b02008-02-22 00:13:36 +01001722struct device_attribute dev_attr_##_prefix##_##_name = \
Mike Christiefd7255f2006-04-06 21:13:36 -05001723 __ATTR(_name,_mode,_show,_store)
1724
Alex Aizman0896b752005-08-04 19:33:07 -07001725/*
1726 * iSCSI connection attrs
1727 */
Mike Christiea54a52c2006-06-28 12:00:23 -05001728#define iscsi_conn_attr_show(param) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729static ssize_t \
Tony Jonesee959b02008-02-22 00:13:36 +01001730show_conn_param_##param(struct device *dev, \
1731 struct device_attribute *attr, char *buf) \
Mike Christiefd7255f2006-04-06 21:13:36 -05001732{ \
Tony Jonesee959b02008-02-22 00:13:36 +01001733 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
Mike Christiefd7255f2006-04-06 21:13:36 -05001734 struct iscsi_transport *t = conn->transport; \
Mike Christiea54a52c2006-06-28 12:00:23 -05001735 return t->get_conn_param(conn, param, buf); \
Mike Christiefd7255f2006-04-06 21:13:36 -05001736}
1737
Mike Christiea54a52c2006-06-28 12:00:23 -05001738#define iscsi_conn_attr(field, param) \
1739 iscsi_conn_attr_show(param) \
1740static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
Mike Christiefd7255f2006-04-06 21:13:36 -05001741 NULL);
1742
Mike Christiea54a52c2006-06-28 12:00:23 -05001743iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1744iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1745iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1746iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1747iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1748iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1749iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1750iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1751iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1752iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1753iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
Mike Christief6d51802007-12-13 12:43:30 -06001754iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1755iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756
1757/*
Alex Aizman0896b752005-08-04 19:33:07 -07001758 * iSCSI session attrs
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 */
Mike Christieb2c64162007-05-30 12:57:16 -05001760#define iscsi_session_attr_show(param, perm) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761static ssize_t \
Tony Jonesee959b02008-02-22 00:13:36 +01001762show_session_param_##param(struct device *dev, \
1763 struct device_attribute *attr, char *buf) \
Mike Christiefd7255f2006-04-06 21:13:36 -05001764{ \
Tony Jonesee959b02008-02-22 00:13:36 +01001765 struct iscsi_cls_session *session = \
1766 iscsi_dev_to_session(dev->parent); \
Mike Christiefd7255f2006-04-06 21:13:36 -05001767 struct iscsi_transport *t = session->transport; \
Mike Christieb2c64162007-05-30 12:57:16 -05001768 \
1769 if (perm && !capable(CAP_SYS_ADMIN)) \
1770 return -EACCES; \
Mike Christiea54a52c2006-06-28 12:00:23 -05001771 return t->get_session_param(session, param, buf); \
Mike Christiefd7255f2006-04-06 21:13:36 -05001772}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Mike Christieb2c64162007-05-30 12:57:16 -05001774#define iscsi_session_attr(field, param, perm) \
1775 iscsi_session_attr_show(param, perm) \
Mike Christiea54a52c2006-06-28 12:00:23 -05001776static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
Mike Christiefd7255f2006-04-06 21:13:36 -05001777 NULL);
1778
Mike Christieb2c64162007-05-30 12:57:16 -05001779iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1780iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1781iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1782iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1783iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1784iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1785iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1786iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1787iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1788iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1789iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1790iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1791iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1792iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
Mike Christie4cd49ea2007-12-13 12:43:38 -06001793iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1794iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1795iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
Mike Christie3fe5ae82009-11-11 16:34:33 -06001796iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
Mike Christie88dfd342008-05-21 15:54:16 -05001797iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
Vikas Chaudhary3b2bef12010-07-10 14:51:30 +05301798iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
1799iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
Mike Christiefd7255f2006-04-06 21:13:36 -05001800
Mike Christie6eabafb2008-01-31 13:36:43 -06001801static ssize_t
Tony Jonesee959b02008-02-22 00:13:36 +01001802show_priv_session_state(struct device *dev, struct device_attribute *attr,
1803 char *buf)
Mike Christie6eabafb2008-01-31 13:36:43 -06001804{
Tony Jonesee959b02008-02-22 00:13:36 +01001805 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
Mike Christie6eabafb2008-01-31 13:36:43 -06001806 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1807}
1808static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1809 NULL);
1810
Mike Christiefd7255f2006-04-06 21:13:36 -05001811#define iscsi_priv_session_attr_show(field, format) \
1812static ssize_t \
Tony Jonesee959b02008-02-22 00:13:36 +01001813show_priv_session_##field(struct device *dev, \
1814 struct device_attribute *attr, char *buf) \
Mike Christiefd7255f2006-04-06 21:13:36 -05001815{ \
Tony Jonesee959b02008-02-22 00:13:36 +01001816 struct iscsi_cls_session *session = \
1817 iscsi_dev_to_session(dev->parent); \
Vikas Chaudharyfe4f0bd2010-07-22 16:57:43 +05301818 if (session->field == -1) \
1819 return sprintf(buf, "off\n"); \
Mike Christiefd7255f2006-04-06 21:13:36 -05001820 return sprintf(buf, format"\n", session->field); \
1821}
1822
Vikas Chaudharyfe4f0bd2010-07-22 16:57:43 +05301823#define iscsi_priv_session_attr_store(field) \
1824static ssize_t \
1825store_priv_session_##field(struct device *dev, \
1826 struct device_attribute *attr, \
1827 const char *buf, size_t count) \
1828{ \
1829 int val; \
1830 char *cp; \
1831 struct iscsi_cls_session *session = \
1832 iscsi_dev_to_session(dev->parent); \
1833 if ((session->state == ISCSI_SESSION_FREE) || \
1834 (session->state == ISCSI_SESSION_FAILED)) \
1835 return -EBUSY; \
1836 if (strncmp(buf, "off", 3) == 0) \
1837 session->field = -1; \
1838 else { \
1839 val = simple_strtoul(buf, &cp, 0); \
1840 if (*cp != '\0' && *cp != '\n') \
1841 return -EINVAL; \
1842 session->field = val; \
1843 } \
1844 return count; \
1845}
1846
1847#define iscsi_priv_session_rw_attr(field, format) \
Mike Christiefd7255f2006-04-06 21:13:36 -05001848 iscsi_priv_session_attr_show(field, format) \
Vikas Chaudharyfe4f0bd2010-07-22 16:57:43 +05301849 iscsi_priv_session_attr_store(field) \
1850static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUGO, \
1851 show_priv_session_##field, \
1852 store_priv_session_##field)
1853iscsi_priv_session_rw_attr(recovery_tmo, "%d");
Mike Christiefd7255f2006-04-06 21:13:36 -05001854
Mike Christie1819dc82007-05-30 12:57:08 -05001855/*
1856 * iSCSI host attrs
1857 */
1858#define iscsi_host_attr_show(param) \
1859static ssize_t \
Tony Jonesee959b02008-02-22 00:13:36 +01001860show_host_param_##param(struct device *dev, \
1861 struct device_attribute *attr, char *buf) \
Mike Christie1819dc82007-05-30 12:57:08 -05001862{ \
Tony Jonesee959b02008-02-22 00:13:36 +01001863 struct Scsi_Host *shost = transport_class_to_shost(dev); \
Mike Christie1819dc82007-05-30 12:57:08 -05001864 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1865 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1866}
1867
1868#define iscsi_host_attr(field, param) \
1869 iscsi_host_attr_show(param) \
1870static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1871 NULL);
1872
Mike Christied8196ed2007-05-30 12:57:25 -05001873iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
Mike Christie1819dc82007-05-30 12:57:08 -05001874iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
Mike Christied8196ed2007-05-30 12:57:25 -05001875iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
Mike Christie8ad57812007-05-30 12:57:13 -05001876iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
Mike Christie1819dc82007-05-30 12:57:08 -05001877
Mike Christiefd7255f2006-04-06 21:13:36 -05001878#define SETUP_PRIV_SESSION_RD_ATTR(field) \
1879do { \
Tony Jonesee959b02008-02-22 00:13:36 +01001880 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
Mike Christiefd7255f2006-04-06 21:13:36 -05001881 count++; \
1882} while (0)
1883
Vikas Chaudharyfe4f0bd2010-07-22 16:57:43 +05301884#define SETUP_PRIV_SESSION_RW_ATTR(field) \
1885do { \
1886 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1887 count++; \
1888} while (0)
Mike Christiea54a52c2006-06-28 12:00:23 -05001889
Mike Christiefd7255f2006-04-06 21:13:36 -05001890#define SETUP_SESSION_RD_ATTR(field, param_flag) \
1891do { \
1892 if (tt->param_mask & param_flag) { \
Tony Jonesee959b02008-02-22 00:13:36 +01001893 priv->session_attrs[count] = &dev_attr_sess_##field; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 count++; \
Mike Christiefd7255f2006-04-06 21:13:36 -05001895 } \
1896} while (0)
1897
Mike Christiefd7255f2006-04-06 21:13:36 -05001898#define SETUP_CONN_RD_ATTR(field, param_flag) \
1899do { \
1900 if (tt->param_mask & param_flag) { \
Tony Jonesee959b02008-02-22 00:13:36 +01001901 priv->conn_attrs[count] = &dev_attr_conn_##field; \
Mike Christiefd7255f2006-04-06 21:13:36 -05001902 count++; \
1903 } \
1904} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905
Mike Christie1819dc82007-05-30 12:57:08 -05001906#define SETUP_HOST_RD_ATTR(field, param_flag) \
1907do { \
1908 if (tt->host_param_mask & param_flag) { \
Tony Jonesee959b02008-02-22 00:13:36 +01001909 priv->host_attrs[count] = &dev_attr_host_##field; \
Mike Christie1819dc82007-05-30 12:57:08 -05001910 count++; \
1911 } \
1912} while (0)
1913
Alex Aizman0896b752005-08-04 19:33:07 -07001914static int iscsi_session_match(struct attribute_container *cont,
1915 struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916{
Mike Christie7b8631b2006-01-13 18:05:50 -06001917 struct iscsi_cls_session *session;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 struct Scsi_Host *shost;
Alex Aizman0896b752005-08-04 19:33:07 -07001919 struct iscsi_internal *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920
Alex Aizman0896b752005-08-04 19:33:07 -07001921 if (!iscsi_is_session_dev(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 return 0;
1923
Mike Christie7b8631b2006-01-13 18:05:50 -06001924 session = iscsi_dev_to_session(dev);
1925 shost = iscsi_session_to_shost(session);
Alex Aizman0896b752005-08-04 19:33:07 -07001926 if (!shost->transportt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 return 0;
1928
Alex Aizman0896b752005-08-04 19:33:07 -07001929 priv = to_iscsi_internal(shost->transportt);
1930 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1931 return 0;
1932
1933 return &priv->session_cont.ac == cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934}
1935
Alex Aizman0896b752005-08-04 19:33:07 -07001936static int iscsi_conn_match(struct attribute_container *cont,
1937 struct device *dev)
1938{
Mike Christie7b8631b2006-01-13 18:05:50 -06001939 struct iscsi_cls_session *session;
1940 struct iscsi_cls_conn *conn;
Alex Aizman0896b752005-08-04 19:33:07 -07001941 struct Scsi_Host *shost;
1942 struct iscsi_internal *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943
Alex Aizman0896b752005-08-04 19:33:07 -07001944 if (!iscsi_is_conn_dev(dev))
1945 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946
Mike Christie7b8631b2006-01-13 18:05:50 -06001947 conn = iscsi_dev_to_conn(dev);
1948 session = iscsi_dev_to_session(conn->dev.parent);
1949 shost = iscsi_session_to_shost(session);
1950
Alex Aizman0896b752005-08-04 19:33:07 -07001951 if (!shost->transportt)
1952 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
Alex Aizman0896b752005-08-04 19:33:07 -07001954 priv = to_iscsi_internal(shost->transportt);
1955 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1956 return 0;
1957
1958 return &priv->conn_cont.ac == cont;
1959}
1960
Mike Christie30a6c652006-04-06 21:13:39 -05001961static int iscsi_host_match(struct attribute_container *cont,
1962 struct device *dev)
1963{
1964 struct Scsi_Host *shost;
1965 struct iscsi_internal *priv;
1966
1967 if (!scsi_is_host_device(dev))
1968 return 0;
1969
1970 shost = dev_to_shost(dev);
1971 if (!shost->transportt ||
1972 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1973 return 0;
1974
1975 priv = to_iscsi_internal(shost->transportt);
1976 return &priv->t.host_attrs.ac == cont;
1977}
1978
Mike Christie7b8631b2006-01-13 18:05:50 -06001979struct scsi_transport_template *
1980iscsi_register_transport(struct iscsi_transport *tt)
Alex Aizman0896b752005-08-04 19:33:07 -07001981{
1982 struct iscsi_internal *priv;
1983 unsigned long flags;
1984 int count = 0, err;
1985
1986 BUG_ON(!tt);
1987
1988 priv = iscsi_if_transport_lookup(tt);
1989 if (priv)
Mike Christie7b8631b2006-01-13 18:05:50 -06001990 return NULL;
Alex Aizman0896b752005-08-04 19:33:07 -07001991
Jes Sorensen24669f752006-01-16 10:31:18 -05001992 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
Alex Aizman0896b752005-08-04 19:33:07 -07001993 if (!priv)
Mike Christie7b8631b2006-01-13 18:05:50 -06001994 return NULL;
Alex Aizman0896b752005-08-04 19:33:07 -07001995 INIT_LIST_HEAD(&priv->list);
Alex Aizman0896b752005-08-04 19:33:07 -07001996 priv->iscsi_transport = tt;
Mike Christie30a6c652006-04-06 21:13:39 -05001997 priv->t.user_scan = iscsi_user_scan;
Mike Christie06d25af2009-03-05 14:46:02 -06001998 priv->t.create_work_queue = 1;
Alex Aizman0896b752005-08-04 19:33:07 -07001999
Tony Jonesee959b02008-02-22 00:13:36 +01002000 priv->dev.class = &iscsi_transport_class;
Kay Sievers71610f52008-12-03 22:41:36 +01002001 dev_set_name(&priv->dev, "%s", tt->name);
Tony Jonesee959b02008-02-22 00:13:36 +01002002 err = device_register(&priv->dev);
Alex Aizman0896b752005-08-04 19:33:07 -07002003 if (err)
2004 goto free_priv;
2005
Tony Jonesee959b02008-02-22 00:13:36 +01002006 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
Alex Aizman0896b752005-08-04 19:33:07 -07002007 if (err)
Tony Jonesee959b02008-02-22 00:13:36 +01002008 goto unregister_dev;
Alex Aizman0896b752005-08-04 19:33:07 -07002009
Mike Christie30a6c652006-04-06 21:13:39 -05002010 /* host parameters */
2011 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2012 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2013 priv->t.host_attrs.ac.match = iscsi_host_match;
Mike Christie32c6e1b2008-05-21 15:53:58 -05002014 priv->t.host_size = sizeof(struct iscsi_cls_host);
Mike Christie30a6c652006-04-06 21:13:39 -05002015 transport_container_register(&priv->t.host_attrs);
2016
Mike Christied8196ed2007-05-30 12:57:25 -05002017 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
Mike Christie22236962007-05-30 12:57:24 -05002018 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
Mike Christie1819dc82007-05-30 12:57:08 -05002019 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
Mike Christie8ad57812007-05-30 12:57:13 -05002020 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
Mike Christie1819dc82007-05-30 12:57:08 -05002021 BUG_ON(count > ISCSI_HOST_ATTRS);
2022 priv->host_attrs[count] = NULL;
2023 count = 0;
2024
Alex Aizman0896b752005-08-04 19:33:07 -07002025 /* connection parameters */
2026 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
2027 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2028 priv->conn_cont.ac.match = iscsi_conn_match;
2029 transport_container_register(&priv->conn_cont);
2030
Mike Christiefd7255f2006-04-06 21:13:36 -05002031 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
2032 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
2033 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
2034 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
2035 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
2036 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
2037 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
2038 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
Mike Christie8d2860b2006-05-02 19:46:47 -05002039 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
Mike Christiea54a52c2006-06-28 12:00:23 -05002040 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
2041 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
Mike Christief6d51802007-12-13 12:43:30 -06002042 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
2043 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
Alex Aizman0896b752005-08-04 19:33:07 -07002044
2045 BUG_ON(count > ISCSI_CONN_ATTRS);
2046 priv->conn_attrs[count] = NULL;
2047 count = 0;
2048
2049 /* session parameters */
2050 priv->session_cont.ac.attrs = &priv->session_attrs[0];
2051 priv->session_cont.ac.class = &iscsi_session_class.class;
2052 priv->session_cont.ac.match = iscsi_session_match;
2053 transport_container_register(&priv->session_cont);
2054
Mike Christiefd7255f2006-04-06 21:13:36 -05002055 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
2056 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
2057 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
2058 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
2059 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
2060 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
2061 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
2062 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
Mike Christiea54a52c2006-06-28 12:00:23 -05002063 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
2064 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
Mike Christieb2c64162007-05-30 12:57:16 -05002065 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2066 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2067 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2068 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
Mike Christie843c0a82007-12-13 12:43:20 -06002069 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
Mike Christie4cd49ea2007-12-13 12:43:38 -06002070 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2071 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002072 SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
Mike Christie88dfd342008-05-21 15:54:16 -05002073 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2074 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
Vikas Chaudhary3b2bef12010-07-10 14:51:30 +05302075 SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
Vikas Chaudharyfe4f0bd2010-07-22 16:57:43 +05302076 SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
Mike Christie6eabafb2008-01-31 13:36:43 -06002077 SETUP_PRIV_SESSION_RD_ATTR(state);
Mike Christiefd7255f2006-04-06 21:13:36 -05002078
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079 BUG_ON(count > ISCSI_SESSION_ATTRS);
Alex Aizman0896b752005-08-04 19:33:07 -07002080 priv->session_attrs[count] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081
Alex Aizman0896b752005-08-04 19:33:07 -07002082 spin_lock_irqsave(&iscsi_transport_lock, flags);
2083 list_add(&priv->list, &iscsi_transports);
2084 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085
Alex Aizman0896b752005-08-04 19:33:07 -07002086 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
Mike Christie7b8631b2006-01-13 18:05:50 -06002087 return &priv->t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Tony Jonesee959b02008-02-22 00:13:36 +01002089unregister_dev:
2090 device_unregister(&priv->dev);
Mike Christied82ff9be2008-05-21 15:54:13 -05002091 return NULL;
Alex Aizman0896b752005-08-04 19:33:07 -07002092free_priv:
2093 kfree(priv);
Mike Christie7b8631b2006-01-13 18:05:50 -06002094 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095}
Alex Aizman0896b752005-08-04 19:33:07 -07002096EXPORT_SYMBOL_GPL(iscsi_register_transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097
Alex Aizman0896b752005-08-04 19:33:07 -07002098int iscsi_unregister_transport(struct iscsi_transport *tt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099{
Alex Aizman0896b752005-08-04 19:33:07 -07002100 struct iscsi_internal *priv;
2101 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102
Alex Aizman0896b752005-08-04 19:33:07 -07002103 BUG_ON(!tt);
2104
Arjan van de Ven0b950672006-01-11 13:16:10 +01002105 mutex_lock(&rx_queue_mutex);
Alex Aizman0896b752005-08-04 19:33:07 -07002106
2107 priv = iscsi_if_transport_lookup(tt);
2108 BUG_ON (!priv);
2109
Alex Aizman0896b752005-08-04 19:33:07 -07002110 spin_lock_irqsave(&iscsi_transport_lock, flags);
2111 list_del(&priv->list);
2112 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2113
2114 transport_container_unregister(&priv->conn_cont);
2115 transport_container_unregister(&priv->session_cont);
Mike Christie30a6c652006-04-06 21:13:39 -05002116 transport_container_unregister(&priv->t.host_attrs);
Alex Aizman0896b752005-08-04 19:33:07 -07002117
Tony Jonesee959b02008-02-22 00:13:36 +01002118 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2119 device_unregister(&priv->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01002120 mutex_unlock(&rx_queue_mutex);
Alex Aizman0896b752005-08-04 19:33:07 -07002121
2122 return 0;
2123}
2124EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2125
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126static __init int iscsi_transport_init(void)
2127{
Alex Aizman0896b752005-08-04 19:33:07 -07002128 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129
Meelis Roos09492602006-12-17 12:10:26 -06002130 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
Mike Christief4246b32006-07-24 15:47:54 -05002131 ISCSI_TRANSPORT_VERSION);
2132
Mike Christie41be1442007-02-28 17:32:18 -06002133 atomic_set(&iscsi_session_nr, 0);
2134
Alex Aizman0896b752005-08-04 19:33:07 -07002135 err = class_register(&iscsi_transport_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136 if (err)
2137 return err;
Alex Aizman0896b752005-08-04 19:33:07 -07002138
Mike Christied82ff9be2008-05-21 15:54:13 -05002139 err = class_register(&iscsi_endpoint_class);
Alex Aizman0896b752005-08-04 19:33:07 -07002140 if (err)
2141 goto unregister_transport_class;
2142
Mike Christied82ff9be2008-05-21 15:54:13 -05002143 err = transport_class_register(&iscsi_host_class);
2144 if (err)
2145 goto unregister_endpoint_class;
2146
Mike Christie30a6c652006-04-06 21:13:39 -05002147 err = transport_class_register(&iscsi_connection_class);
2148 if (err)
2149 goto unregister_host_class;
2150
Alex Aizman0896b752005-08-04 19:33:07 -07002151 err = transport_class_register(&iscsi_session_class);
2152 if (err)
2153 goto unregister_conn_class;
2154
Mike Christied82ff9be2008-05-21 15:54:13 -05002155 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2156 NULL, THIS_MODULE);
Alex Aizman0896b752005-08-04 19:33:07 -07002157 if (!nls) {
2158 err = -ENOBUFS;
Mike Christie43a145a2006-10-16 18:09:38 -04002159 goto unregister_session_class;
Alex Aizman0896b752005-08-04 19:33:07 -07002160 }
2161
Mike Christied8bf5412007-12-13 12:43:27 -06002162 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2163 if (!iscsi_eh_timer_workq)
2164 goto release_nls;
2165
Mike Christie43a145a2006-10-16 18:09:38 -04002166 return 0;
Alex Aizman0896b752005-08-04 19:33:07 -07002167
Mike Christied8bf5412007-12-13 12:43:27 -06002168release_nls:
Denis V. Lunevb7c6ba62008-01-28 14:41:19 -08002169 netlink_kernel_release(nls);
Alex Aizman0896b752005-08-04 19:33:07 -07002170unregister_session_class:
2171 transport_class_unregister(&iscsi_session_class);
2172unregister_conn_class:
2173 transport_class_unregister(&iscsi_connection_class);
Mike Christie30a6c652006-04-06 21:13:39 -05002174unregister_host_class:
2175 transport_class_unregister(&iscsi_host_class);
Mike Christied82ff9be2008-05-21 15:54:13 -05002176unregister_endpoint_class:
2177 class_unregister(&iscsi_endpoint_class);
Alex Aizman0896b752005-08-04 19:33:07 -07002178unregister_transport_class:
2179 class_unregister(&iscsi_transport_class);
2180 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181}
2182
2183static void __exit iscsi_transport_exit(void)
2184{
Mike Christied8bf5412007-12-13 12:43:27 -06002185 destroy_workqueue(iscsi_eh_timer_workq);
Denis V. Lunevb7c6ba62008-01-28 14:41:19 -08002186 netlink_kernel_release(nls);
Alex Aizman0896b752005-08-04 19:33:07 -07002187 transport_class_unregister(&iscsi_connection_class);
2188 transport_class_unregister(&iscsi_session_class);
Mike Christie30a6c652006-04-06 21:13:39 -05002189 transport_class_unregister(&iscsi_host_class);
Mike Christied82ff9be2008-05-21 15:54:13 -05002190 class_unregister(&iscsi_endpoint_class);
Alex Aizman0896b752005-08-04 19:33:07 -07002191 class_unregister(&iscsi_transport_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192}
2193
2194module_init(iscsi_transport_init);
2195module_exit(iscsi_transport_exit);
2196
Alex Aizman0896b752005-08-04 19:33:07 -07002197MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2198 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2199 "Alex Aizman <itn780@yahoo.com>");
2200MODULE_DESCRIPTION("iSCSI Transport Interface");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002201MODULE_LICENSE("GPL");
Mike Christief4246b32006-07-24 15:47:54 -05002202MODULE_VERSION(ISCSI_TRANSPORT_VERSION);