projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[SCSI] iscsi class: sysfs group is_visible callout for session attrs
[deliverable/linux.git] / drivers / scsi / scsi_transport_iscsi.c
CommitLineData
0896b752 1/*
1da177e4
LT		 2 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
0896b752
AA		 5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
1da177e4
LT		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23#include <linux/module.h>
0b950672 24#include <linux/mutex.h>
5a0e3ad6 25#include <linux/slab.h>
0896b752 26#include <net/tcp.h>
1da177e4
LT		 27#include <scsi/scsi.h>
28#include <scsi/scsi_host.h>
29#include <scsi/scsi_device.h>
30#include <scsi/scsi_transport.h>
31#include <scsi/scsi_transport_iscsi.h>
0896b752 32#include <scsi/iscsi_if.h>
c01be6dc 33#include <scsi/scsi_cmnd.h>
1da177e4 34
d8196ed2 35#define ISCSI_HOST_ATTRS 4
d82ff9be 36
4c2133c8 37#define ISCSI_TRANSPORT_VERSION "2.0-870"
1da177e4 38
632248aa
MC		 39static int dbg_session;
40module_param_named(debug_session, dbg_session, int,
41 S_IRUGO | S_IWUSR);
42MODULE_PARM_DESC(debug_session,
43 "Turn on debugging for sessions in scsi_transport_iscsi "
44 "module. Set to 1 to turn on, and zero to turn off. Default "
45 "is off.");
46
47static int dbg_conn;
48module_param_named(debug_conn, dbg_conn, int,
49 S_IRUGO | S_IWUSR);
50MODULE_PARM_DESC(debug_conn,
51 "Turn on debugging for connections in scsi_transport_iscsi "
52 "module. Set to 1 to turn on, and zero to turn off. Default "
53 "is off.");
54
55#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
56 do { \
57 if (dbg_session) \
58 iscsi_cls_session_printk(KERN_INFO, _session, \
59 "%s: " dbg_fmt, \
60 __func__, ##arg); \
61 } while (0);
62
63#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
64 do { \
65 if (dbg_conn) \
66 iscsi_cls_conn_printk(KERN_INFO, _conn, \
67 "%s: " dbg_fmt, \
68 __func__, ##arg); \
69 } while (0);
70
1da177e4
LT		 71struct iscsi_internal {
72 struct scsi_transport_template t;
0896b752
AA		 73 struct iscsi_transport *iscsi_transport;
74 struct list_head list;
ee959b00 75 struct device dev;
30a6c652 76
ee959b00 77 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
0896b752 78 struct transport_container conn_cont;
0896b752 79 struct transport_container session_cont;
1da177e4
LT		 80};
81
41be1444 82static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
d8bf541e 83static struct workqueue_struct *iscsi_eh_timer_workq;
b5c7a12d 84
0896b752
AA		 85/*
86 * list of registered transports and lock that must
87 * be held while accessing list. The iscsi_transport_lock must
0b950672 88 * be acquired after the rx_queue_mutex.
0896b752
AA		 89 */
90static LIST_HEAD(iscsi_transports);
91static DEFINE_SPINLOCK(iscsi_transport_lock);
92
93#define to_iscsi_internal(tmpl) \
94 container_of(tmpl, struct iscsi_internal, t)
95
ee959b00
TJ		 96#define dev_to_iscsi_internal(_dev) \
97 container_of(_dev, struct iscsi_internal, dev)
0896b752 98
ee959b00 99static void iscsi_transport_release(struct device *dev)
0896b752 100{
ee959b00 101 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
0896b752
AA		 102 kfree(priv);
103}
1da177e4 104
0896b752
AA		 105/*
106 * iscsi_transport_class represents the iscsi_transports that are
107 * registered.
108 */
109static struct class iscsi_transport_class = {
110 .name = "iscsi_transport",
ee959b00 111 .dev_release = iscsi_transport_release,
0896b752
AA		 112};
113
114static ssize_t
ee959b00
TJ		 115show_transport_handle(struct device *dev, struct device_attribute *attr,
116 char *buf)
0896b752 117{
ee959b00 118 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
762e2bfa 119 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752 120}
ee959b00 121static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
0896b752
AA		 122
123#define show_transport_attr(name, format) \
124static ssize_t \
ee959b00
TJ		 125show_transport_##name(struct device *dev, \
126 struct device_attribute *attr,char *buf) \
0896b752 127{ \
ee959b00 128 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
0896b752
AA		 129 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
130} \
ee959b00 131static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
0896b752
AA		 132
133show_transport_attr(caps, "0x%x");
0896b752
AA		 134
135static struct attribute *iscsi_transport_attrs[] = {
ee959b00
TJ		 136 &dev_attr_handle.attr,
137 &dev_attr_caps.attr,
0896b752
AA		 138 NULL,
139};
140
141static struct attribute_group iscsi_transport_group = {
142 .attrs = iscsi_transport_attrs,
143};
144
d82ff9be
MC		 145/*
146 * iSCSI endpoint attrs
147 */
148#define iscsi_dev_to_endpoint(_dev) \
149 container_of(_dev, struct iscsi_endpoint, dev)
150
151#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
152struct device_attribute dev_attr_##_prefix##_##_name = \
153 __ATTR(_name,_mode,_show,_store)
154
155static void iscsi_endpoint_release(struct device *dev)
156{
157 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
158 kfree(ep);
159}
160
161static struct class iscsi_endpoint_class = {
162 .name = "iscsi_endpoint",
163 .dev_release = iscsi_endpoint_release,
164};
165
166static ssize_t
167show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
168{
169 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 170 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
d82ff9be
MC		 171}
172static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
173
174static struct attribute *iscsi_endpoint_attrs[] = {
175 &dev_attr_ep_handle.attr,
176 NULL,
177};
178
179static struct attribute_group iscsi_endpoint_group = {
180 .attrs = iscsi_endpoint_attrs,
181};
182
183#define ISCSI_MAX_EPID -1
184
185static int iscsi_match_epid(struct device *dev, void *data)
186{
187 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 188 uint64_t *epid = (uint64_t *) data;
d82ff9be
MC		 189
190 return *epid == ep->id;
191}
192
193struct iscsi_endpoint *
194iscsi_create_endpoint(int dd_size)
195{
196 struct device *dev;
197 struct iscsi_endpoint *ep;
21536062 198 uint64_t id;
d82ff9be
MC		 199 int err;
200
201 for (id = 1; id < ISCSI_MAX_EPID; id++) {
695794ae 202 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
d82ff9be
MC		 203 iscsi_match_epid);
204 if (!dev)
205 break;
206 }
207 if (id == ISCSI_MAX_EPID) {
208 printk(KERN_ERR "Too many connections. Max supported %u\n",
209 ISCSI_MAX_EPID - 1);
210 return NULL;
211 }
212
213 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
214 if (!ep)
215 return NULL;
216
217 ep->id = id;
218 ep->dev.class = &iscsi_endpoint_class;
71610f55 219 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
d82ff9be
MC		 220 err = device_register(&ep->dev);
221 if (err)
222 goto free_ep;
223
224 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
225 if (err)
226 goto unregister_dev;
227
228 if (dd_size)
229 ep->dd_data = &ep[1];
230 return ep;
231
232unregister_dev:
233 device_unregister(&ep->dev);
234 return NULL;
235
236free_ep:
237 kfree(ep);
238 return NULL;
239}
240EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
241
242void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
243{
244 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
245 device_unregister(&ep->dev);
246}
247EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
248
249struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
250{
f80f868e 251 struct iscsi_endpoint *ep;
d82ff9be
MC		 252 struct device *dev;
253
695794ae 254 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
d82ff9be
MC		 255 iscsi_match_epid);
256 if (!dev)
257 return NULL;
258
f80f868e
MC		 259 ep = iscsi_dev_to_endpoint(dev);
260 /*
261 * we can drop this now because the interface will prevent
262 * removals and lookups from racing.
263 */
264 put_device(dev);
265 return ep;
d82ff9be
MC		 266}
267EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
268
8d07913d
MC		 269/*
270 * Interface to display network param to sysfs
271 */
272
273static void iscsi_iface_release(struct device *dev)
274{
275 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
276 struct device *parent = iface->dev.parent;
277
278 kfree(iface);
279 put_device(parent);
280}
281
282
283static struct class iscsi_iface_class = {
284 .name = "iscsi_iface",
285 .dev_release = iscsi_iface_release,
286};
287
288#define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
289struct device_attribute dev_attr_##_prefix##_##_name = \
290 __ATTR(_name, _mode, _show, _store)
291
292/* iface attrs show */
293#define iscsi_iface_attr_show(type, name, param_type, param) \
294static ssize_t \
295show_##type##_##name(struct device *dev, struct device_attribute *attr, \
296 char *buf) \
297{ \
298 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
299 struct iscsi_transport *t = iface->transport; \
300 return t->get_iface_param(iface, param_type, param, buf); \
301} \
302
303#define iscsi_iface_net_attr(type, name, param) \
304 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
305static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
306
307/* generic read only ipvi4 attribute */
308iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
309iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
310iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
311iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
312
313/* generic read only ipv6 attribute */
314iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
315iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
316iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
317iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
318 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
319iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
320 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
321
322/* common read only iface attribute */
323iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
324iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
325
326static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
327 struct attribute *attr, int i)
328{
329 struct device *dev = container_of(kobj, struct device, kobj);
330 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
331 struct iscsi_transport *t = iface->transport;
332
333 if (attr == &dev_attr_iface_enabled.attr)
334 return (t->iface_param_mask & ISCSI_NET_IFACE_ENABLE) ?
335 S_IRUGO : 0;
336 else if (attr == &dev_attr_iface_vlan.attr)
337 return (t->iface_param_mask & ISCSI_NET_VLAN_ID) ? S_IRUGO : 0;
338
339 if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
340 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
341 return (t->iface_param_mask & ISCSI_NET_IPV4_ADDR) ?
342 S_IRUGO : 0;
343 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
344 return (t->iface_param_mask & ISCSI_NET_IPV4_GW) ?
345 S_IRUGO : 0;
346 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
347 return (t->iface_param_mask & ISCSI_NET_IPV4_SUBNET) ?
348 S_IRUGO : 0;
349 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
350 return (t->iface_param_mask & ISCSI_NET_IPV4_BOOTPROTO) ?
351 S_IRUGO : 0;
352 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
353 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
354 return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR) ?
355 S_IRUGO : 0;
356 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
357 return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL) ?
358 S_IRUGO : 0;
359 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
360 return (t->iface_param_mask & ISCSI_NET_IPV6_ROUTER) ?
361 S_IRUGO : 0;
362 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
363 return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR_AUTOCFG) ?
364 S_IRUGO : 0;
365 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
366 return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL_AUTOCFG) ?
367 S_IRUGO : 0;
368 }
369
370 return 0;
371}
372
373static struct attribute *iscsi_iface_attrs[] = {
374 &dev_attr_iface_enabled.attr,
375 &dev_attr_iface_vlan.attr,
376 &dev_attr_ipv4_iface_ipaddress.attr,
377 &dev_attr_ipv4_iface_gateway.attr,
378 &dev_attr_ipv4_iface_subnet.attr,
379 &dev_attr_ipv4_iface_bootproto.attr,
380 &dev_attr_ipv6_iface_ipaddress.attr,
381 &dev_attr_ipv6_iface_link_local_addr.attr,
382 &dev_attr_ipv6_iface_router_addr.attr,
383 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
384 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
385 NULL,
386};
387
388static struct attribute_group iscsi_iface_group = {
389 .attrs = iscsi_iface_attrs,
390 .is_visible = iscsi_iface_attr_is_visible,
391};
392
393struct iscsi_iface *
394iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
395 uint32_t iface_type, uint32_t iface_num, int dd_size)
396{
397 struct iscsi_iface *iface;
398 int err;
399
400 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
401 if (!iface)
402 return NULL;
403
404 iface->transport = transport;
405 iface->iface_type = iface_type;
406 iface->iface_num = iface_num;
407 iface->dev.release = iscsi_iface_release;
408 iface->dev.class = &iscsi_iface_class;
409 /* parent reference released in iscsi_iface_release */
410 iface->dev.parent = get_device(&shost->shost_gendev);
411 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
412 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
413 iface_num);
414 else
415 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
416 iface_num);
417
418 err = device_register(&iface->dev);
419 if (err)
420 goto free_iface;
421
422 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
423 if (err)
424 goto unreg_iface;
425
426 if (dd_size)
427 iface->dd_data = &iface[1];
428 return iface;
429
430unreg_iface:
431 device_unregister(&iface->dev);
432 return NULL;
433
434free_iface:
435 put_device(iface->dev.parent);
436 kfree(iface);
437 return NULL;
438}
439EXPORT_SYMBOL_GPL(iscsi_create_iface);
440
441void iscsi_destroy_iface(struct iscsi_iface *iface)
442{
443 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
444 device_unregister(&iface->dev);
445}
446EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
447
30a6c652 448static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 449 struct device *cdev)
30a6c652
MC		 450{
451 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 452 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 453
454 memset(ihost, 0, sizeof(*ihost));
8aae18ad 455 atomic_set(&ihost->nr_scans, 0);
7970634b 456 mutex_init(&ihost->mutex);
30a6c652
MC		 457 return 0;
458}
459
460static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
461 "iscsi_host",
462 iscsi_setup_host,
06d25af4 463 NULL,
30a6c652
MC		 464 NULL);
465
0896b752
AA		 466static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
467 "iscsi_session",
1da177e4
LT		 468 NULL,
469 NULL,
470 NULL);
471
0896b752
AA		 472static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
473 "iscsi_connection",
1da177e4
LT		 474 NULL,
475 NULL,
476 NULL);
0896b752
AA		 477
478static struct sock *nls;
0b950672 479static DEFINE_MUTEX(rx_queue_mutex);
0896b752 480
7b7232f3
MC		 481static LIST_HEAD(sesslist);
482static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 483static LIST_HEAD(connlist);
484static DEFINE_SPINLOCK(connlock);
0896b752 485
b5c7a12d
MC		 486static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
487{
488 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
489 return sess->sid;
490}
491
492/*
493 * Returns the matching session to a given sid
494 */
495static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 496{
497 unsigned long flags;
498 struct iscsi_cls_session *sess;
499
500 spin_lock_irqsave(&sesslock, flags);
501 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 502 if (sess->sid == sid) {
7b7232f3
MC		 503 spin_unlock_irqrestore(&sesslock, flags);
504 return sess;
505 }
506 }
507 spin_unlock_irqrestore(&sesslock, flags);
508 return NULL;
509}
510
b5c7a12d
MC		 511/*
512 * Returns the matching connection to a given sid / cid tuple
513 */
514static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 515{
516 unsigned long flags;
517 struct iscsi_cls_conn *conn;
518
519 spin_lock_irqsave(&connlock, flags);
520 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 521 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 522 spin_unlock_irqrestore(&connlock, flags);
523 return conn;
524 }
525 }
526 spin_unlock_irqrestore(&connlock, flags);
527 return NULL;
528}
529
7b8631b5
MC		 530/*
531 * The following functions can be used by LLDs that allocate
532 * their own scsi_hosts or by software iscsi LLDs
533 */
6eabafbe
MC		 534static struct {
535 int value;
536 char *name;
537} iscsi_session_state_names[] = {
538 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
539 { ISCSI_SESSION_FAILED, "FAILED" },
540 { ISCSI_SESSION_FREE, "FREE" },
541};
542
3b0f208a 543static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 544{
545 int i;
546 char *name = NULL;
547
548 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
549 if (iscsi_session_state_names[i].value == state) {
550 name = iscsi_session_state_names[i].name;
551 break;
552 }
553 }
554 return name;
555}
556
557int iscsi_session_chkready(struct iscsi_cls_session *session)
558{
559 unsigned long flags;
560 int err;
561
562 spin_lock_irqsave(&session->lock, flags);
563 switch (session->state) {
564 case ISCSI_SESSION_LOGGED_IN:
565 err = 0;
566 break;
567 case ISCSI_SESSION_FAILED:
9a1a69a1 568 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 569 break;
570 case ISCSI_SESSION_FREE:
56d7fcfa 571 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 572 break;
573 default:
574 err = DID_NO_CONNECT << 16;
575 break;
576 }
577 spin_unlock_irqrestore(&session->lock, flags);
578 return err;
579}
580EXPORT_SYMBOL_GPL(iscsi_session_chkready);
581
7b8631b5
MC		 582static void iscsi_session_release(struct device *dev)
583{
584 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 585 struct Scsi_Host *shost;
0896b752 586
7b8631b5
MC		 587 shost = iscsi_session_to_shost(session);
588 scsi_host_put(shost);
632248aa 589 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
7b8631b5 590 kfree(session);
7b8631b5 591}
0896b752 592
7b8631b5
MC		 593static int iscsi_is_session_dev(const struct device *dev)
594{
595 return dev->release == iscsi_session_release;
596}
0896b752 597
a4804cd6
MC		 598static int iscsi_iter_session_fn(struct device *dev, void *data)
599{
600 void (* fn) (struct iscsi_cls_session *) = data;
601
602 if (!iscsi_is_session_dev(dev))
603 return 0;
604 fn(iscsi_dev_to_session(dev));
605 return 0;
606}
607
608void iscsi_host_for_each_session(struct Scsi_Host *shost,
609 void (*fn)(struct iscsi_cls_session *))
610{
611 device_for_each_child(&shost->shost_gendev, fn,
612 iscsi_iter_session_fn);
613}
614EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
615
8aae18ad
MC		 616/**
617 * iscsi_scan_finished - helper to report when running scans are done
618 * @shost: scsi host
619 * @time: scan run time
620 *
621 * This function can be used by drives like qla4xxx to report to the scsi
622 * layer when the scans it kicked off at module load time are done.
623 */
624int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
625{
32c6e1b9 626 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 627 /*
628 * qla4xxx will have kicked off some session unblocks before calling
629 * scsi_scan_host, so just wait for them to complete.
630 */
631 return !atomic_read(&ihost->nr_scans);
632}
633EXPORT_SYMBOL_GPL(iscsi_scan_finished);
634
7970634b
MC		 635struct iscsi_scan_data {
636 unsigned int channel;
637 unsigned int id;
638 unsigned int lun;
639};
640
641static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 642{
7970634b 643 struct iscsi_scan_data *scan_data = data;
30a6c652 644 struct iscsi_cls_session *session;
7970634b
MC		 645 struct Scsi_Host *shost;
646 struct iscsi_cls_host *ihost;
647 unsigned long flags;
648 unsigned int id;
649
650 if (!iscsi_is_session_dev(dev))
651 return 0;
652
653 session = iscsi_dev_to_session(dev);
632248aa
MC		 654
655 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
656
7970634b
MC		 657 shost = iscsi_session_to_shost(session);
658 ihost = shost->shost_data;
30a6c652
MC		 659
660 mutex_lock(&ihost->mutex);
7970634b
MC		 661 spin_lock_irqsave(&session->lock, flags);
662 if (session->state != ISCSI_SESSION_LOGGED_IN) {
663 spin_unlock_irqrestore(&session->lock, flags);
632248aa 664 goto user_scan_exit;
30a6c652 665 }
7970634b
MC		 666 id = session->target_id;
667 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 668
7970634b
MC		 669 if (id != ISCSI_MAX_TARGET) {
670 if ((scan_data->channel == SCAN_WILD_CARD ||
671 scan_data->channel == 0) &&
672 (scan_data->id == SCAN_WILD_CARD ||
673 scan_data->id == id))
674 scsi_scan_target(&session->dev, 0, id,
675 scan_data->lun, 1);
676 }
632248aa
MC		 677
678user_scan_exit:
7970634b 679 mutex_unlock(&ihost->mutex);
632248aa 680 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 681 return 0;
682}
683
7970634b
MC		 684static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
685 uint id, uint lun)
686{
687 struct iscsi_scan_data scan_data;
688
689 scan_data.channel = channel;
690 scan_data.id = id;
691 scan_data.lun = lun;
692
693 return device_for_each_child(&shost->shost_gendev, &scan_data,
694 iscsi_user_scan_session);
695}
696
bd976f62
MC		 697static void iscsi_scan_session(struct work_struct *work)
698{
699 struct iscsi_cls_session *session =
700 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 701 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 702 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 703 struct iscsi_scan_data scan_data;
bd976f62 704
7970634b
MC		 705 scan_data.channel = 0;
706 scan_data.id = SCAN_WILD_CARD;
707 scan_data.lun = SCAN_WILD_CARD;
bd976f62 708
7970634b 709 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 710 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 711}
712
c01be6dc
MC		 713/**
714 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 715 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 716 *
717 * If the session is down this function will wait for the recovery
718 * timer to fire or for the session to be logged back in. If the
719 * recovery timer fires then FAST_IO_FAIL is returned. The caller
720 * should pass this error value to the scsi eh.
721 */
722int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
723{
724 struct iscsi_cls_session *session =
725 starget_to_session(scsi_target(cmd->device));
726 unsigned long flags;
727 int ret = 0;
728
729 spin_lock_irqsave(&session->lock, flags);
730 while (session->state != ISCSI_SESSION_LOGGED_IN) {
731 if (session->state == ISCSI_SESSION_FREE) {
732 ret = FAST_IO_FAIL;
733 break;
734 }
735 spin_unlock_irqrestore(&session->lock, flags);
736 msleep(1000);
737 spin_lock_irqsave(&session->lock, flags);
738 }
739 spin_unlock_irqrestore(&session->lock, flags);
740 return ret;
741}
742EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
743
c4028958 744static void session_recovery_timedout(struct work_struct *work)
30a6c652 745{
c4028958
DH		 746 struct iscsi_cls_session *session =
747 container_of(work, struct iscsi_cls_session,
748 recovery_work.work);
6eabafbe 749 unsigned long flags;
30a6c652 750
322d739d
MC		 751 iscsi_cls_session_printk(KERN_INFO, session,
752 "session recovery timed out after %d secs\n",
753 session->recovery_tmo);
30a6c652 754
6eabafbe
MC		 755 spin_lock_irqsave(&session->lock, flags);
756 switch (session->state) {
757 case ISCSI_SESSION_FAILED:
758 session->state = ISCSI_SESSION_FREE;
759 break;
760 case ISCSI_SESSION_LOGGED_IN:
761 case ISCSI_SESSION_FREE:
762 /* we raced with the unblock's flush */
763 spin_unlock_irqrestore(&session->lock, flags);
764 return;
765 }
766 spin_unlock_irqrestore(&session->lock, flags);
767
30a6c652
MC		 768 if (session->transport->session_recovery_timedout)
769 session->transport->session_recovery_timedout(session);
770
632248aa 771 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
30a6c652 772 scsi_target_unblock(&session->dev);
632248aa 773 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 774}
775
45ab33b6 776static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 777{
45ab33b6
MC		 778 struct iscsi_cls_session *session =
779 container_of(work, struct iscsi_cls_session,
780 unblock_work);
bd976f62 781 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 782 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 783 unsigned long flags;
784
632248aa 785 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 786 /*
787 * The recovery and unblock work get run from the same workqueue,
788 * so try to cancel it if it was going to run after this unblock.
789 */
790 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 791 spin_lock_irqsave(&session->lock, flags);
792 session->state = ISCSI_SESSION_LOGGED_IN;
793 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 794 /* start IO */
795 scsi_target_unblock(&session->dev);
8aae18ad
MC		 796 /*
797 * Only do kernel scanning if the driver is properly hooked into
798 * the async scanning code (drivers like iscsi_tcp do login and
799 * scanning from userspace).
800 */
801 if (shost->hostt->scan_finished) {
06d25af4 802 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 803 atomic_inc(&ihost->nr_scans);
804 }
632248aa 805 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 806}
45ab33b6
MC		 807
808/**
809 * iscsi_unblock_session - set a session as logged in and start IO.
810 * @session: iscsi session
811 *
812 * Mark a session as ready to accept IO.
813 */
814void iscsi_unblock_session(struct iscsi_cls_session *session)
815{
816 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
817 /*
818 * make sure all the events have completed before tell the driver
819 * it is safe
820 */
821 flush_workqueue(iscsi_eh_timer_workq);
822}
30a6c652
MC		 823EXPORT_SYMBOL_GPL(iscsi_unblock_session);
824
45ab33b6 825static void __iscsi_block_session(struct work_struct *work)
30a6c652 826{
45ab33b6
MC		 827 struct iscsi_cls_session *session =
828 container_of(work, struct iscsi_cls_session,
829 block_work);
6eabafbe
MC		 830 unsigned long flags;
831
632248aa 832 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 833 spin_lock_irqsave(&session->lock, flags);
834 session->state = ISCSI_SESSION_FAILED;
835 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 836 scsi_target_block(&session->dev);
632248aa 837 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 838 if (session->recovery_tmo >= 0)
839 queue_delayed_work(iscsi_eh_timer_workq,
840 &session->recovery_work,
841 session->recovery_tmo * HZ);
30a6c652 842}
45ab33b6
MC		 843
844void iscsi_block_session(struct iscsi_cls_session *session)
845{
846 queue_work(iscsi_eh_timer_workq, &session->block_work);
847}
30a6c652
MC		 848EXPORT_SYMBOL_GPL(iscsi_block_session);
849
26974789
MC		 850static void __iscsi_unbind_session(struct work_struct *work)
851{
852 struct iscsi_cls_session *session =
853 container_of(work, struct iscsi_cls_session,
854 unbind_work);
855 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 856 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 857 unsigned long flags;
26974789 858
632248aa
MC		 859 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
860
26974789
MC		 861 /* Prevent new scans and make sure scanning is not in progress */
862 mutex_lock(&ihost->mutex);
7970634b
MC		 863 spin_lock_irqsave(&session->lock, flags);
864 if (session->target_id == ISCSI_MAX_TARGET) {
865 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 866 mutex_unlock(&ihost->mutex);
867 return;
868 }
7970634b
MC		 869 session->target_id = ISCSI_MAX_TARGET;
870 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 871 mutex_unlock(&ihost->mutex);
872
873 scsi_remove_target(&session->dev);
874 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 875 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 876}
877
7b8631b5 878struct iscsi_cls_session *
5d91e209
MC		 879iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
880 int dd_size)
7b8631b5
MC		 881{
882 struct iscsi_cls_session *session;
7b8631b5 883
5d91e209 884 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 885 GFP_KERNEL);
7b8631b5 886 if (!session)
f53a88da
MC		 887 return NULL;
888
7b8631b5 889 session->transport = transport;
30a6c652 890 session->recovery_tmo = 120;
6eabafbe 891 session->state = ISCSI_SESSION_FREE;
c4028958 892 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 893 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 894 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
895 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 896 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 897 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 898 spin_lock_init(&session->lock);
7b8631b5 899
6a8a0d36
MC		 900 /* this is released in the dev's release function */
901 scsi_host_get(shost);
8434aa8b
MC		 902 session->dev.parent = &shost->shost_gendev;
903 session->dev.release = iscsi_session_release;
904 device_initialize(&session->dev);
5d91e209 905 if (dd_size)
b5c7a12d 906 session->dd_data = &session[1];
632248aa
MC		 907
908 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 909 return session;
910}
911EXPORT_SYMBOL_GPL(iscsi_alloc_session);
912
7970634b
MC		 913static int iscsi_get_next_target_id(struct device *dev, void *data)
914{
915 struct iscsi_cls_session *session;
916 unsigned long flags;
917 int err = 0;
918
919 if (!iscsi_is_session_dev(dev))
920 return 0;
921
922 session = iscsi_dev_to_session(dev);
923 spin_lock_irqsave(&session->lock, flags);
924 if (*((unsigned int *) data) == session->target_id)
925 err = -EEXIST;
926 spin_unlock_irqrestore(&session->lock, flags);
927 return err;
928}
929
6a8a0d36 930int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 931{
932 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 933 struct iscsi_cls_host *ihost;
26974789 934 unsigned long flags;
7970634b 935 unsigned int id = target_id;
8434aa8b 936 int err;
b5c7a12d 937
30a6c652 938 ihost = shost->shost_data;
41be1444 939 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 940
941 if (id == ISCSI_MAX_TARGET) {
942 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
943 err = device_for_each_child(&shost->shost_gendev, &id,
944 iscsi_get_next_target_id);
945 if (!err)
946 break;
947 }
948
949 if (id == ISCSI_MAX_TARGET) {
950 iscsi_cls_session_printk(KERN_ERR, session,
951 "Too many iscsi targets. Max "
952 "number of targets is %d.\n",
953 ISCSI_MAX_TARGET - 1);
24add1c4 954 err = -EOVERFLOW;
7970634b
MC		 955 goto release_host;
956 }
957 }
958 session->target_id = id;
30a6c652 959
71610f55 960 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 961 err = device_add(&session->dev);
7b8631b5 962 if (err) {
322d739d
MC		 963 iscsi_cls_session_printk(KERN_ERR, session,
964 "could not register session's dev\n");
8434aa8b 965 goto release_host;
7b8631b5
MC		 966 }
967 transport_register_device(&session->dev);
968
26974789
MC		 969 spin_lock_irqsave(&sesslock, flags);
970 list_add(&session->sess_list, &sesslist);
971 spin_unlock_irqrestore(&sesslock, flags);
972
26974789 973 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 974 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 975 return 0;
30a6c652 976
8434aa8b
MC		 977release_host:
978 scsi_host_put(shost);
979 return err;
7b8631b5 980}
8434aa8b 981EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 982
983/**
8434aa8b
MC		 984 * iscsi_create_session - create iscsi class session
985 * @shost: scsi host
986 * @transport: iscsi transport
5d91e209 987 * @dd_size: private driver data size
eb44820c 988 * @target_id: which target
7b8631b5 989 *
8434aa8b 990 * This can be called from a LLD or iscsi_transport.
eb44820c 991 */
8434aa8b 992struct iscsi_cls_session *
5d91e209
MC		 993iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
994 int dd_size, unsigned int target_id)
8434aa8b
MC		 995{
996 struct iscsi_cls_session *session;
997
5d91e209 998 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 999 if (!session)
1000 return NULL;
1001
6a8a0d36 1002 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1003 iscsi_free_session(session);
1004 return NULL;
1005 }
1006 return session;
1007}
1008EXPORT_SYMBOL_GPL(iscsi_create_session);
1009
26974789
MC		 1010static void iscsi_conn_release(struct device *dev)
1011{
1012 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1013 struct device *parent = conn->dev.parent;
1014
632248aa 1015 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1016 kfree(conn);
1017 put_device(parent);
1018}
1019
1020static int iscsi_is_conn_dev(const struct device *dev)
1021{
1022 return dev->release == iscsi_conn_release;
1023}
1024
1025static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1026{
1027 if (!iscsi_is_conn_dev(dev))
1028 return 0;
1029 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1030}
1031
8434aa8b 1032void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1033{
30a6c652 1034 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1035 unsigned long flags;
1036 int err;
1037
632248aa
MC		 1038 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1039
26974789
MC		 1040 spin_lock_irqsave(&sesslock, flags);
1041 list_del(&session->sess_list);
1042 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1043
45ab33b6
MC		 1044 /* make sure there are no blocks/unblocks queued */
1045 flush_workqueue(iscsi_eh_timer_workq);
1046 /* make sure the timedout callout is not running */
1047 if (!cancel_delayed_work(&session->recovery_work))
1048 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1049 /*
1050 * If we are blocked let commands flow again. The lld or iscsi
1051 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1052 * We assume that LLD will not be calling block/unblock while
1053 * removing the session.
26974789 1054 */
6eabafbe
MC		 1055 spin_lock_irqsave(&session->lock, flags);
1056 session->state = ISCSI_SESSION_FREE;
1057 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1058
45ab33b6
MC		 1059 scsi_target_unblock(&session->dev);
1060 /* flush running scans then delete devices */
06d25af4 1061 scsi_flush_work(shost);
45ab33b6 1062 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1063
26974789
MC		 1064 /* hw iscsi may not have removed all connections from session */
1065 err = device_for_each_child(&session->dev, NULL,
1066 iscsi_iter_destroy_conn_fn);
1067 if (err)
322d739d
MC		 1068 iscsi_cls_session_printk(KERN_ERR, session,
1069 "Could not delete all connections "
1070 "for session. Error %d.\n", err);
8434aa8b 1071
7b8631b5 1072 transport_unregister_device(&session->dev);
632248aa
MC		 1073
1074 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1075 device_del(&session->dev);
1076}
1077EXPORT_SYMBOL_GPL(iscsi_remove_session);
1078
1079void iscsi_free_session(struct iscsi_cls_session *session)
1080{
632248aa 1081 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1082 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1083 put_device(&session->dev);
7b8631b5 1084}
8434aa8b
MC		 1085EXPORT_SYMBOL_GPL(iscsi_free_session);
1086
1087/**
1088 * iscsi_destroy_session - destroy iscsi session
1089 * @session: iscsi_session
1090 *
1091 * Can be called by a LLD or iscsi_transport. There must not be
1092 * any running connections.
eb44820c 1093 */
8434aa8b
MC		 1094int iscsi_destroy_session(struct iscsi_cls_session *session)
1095{
1096 iscsi_remove_session(session);
632248aa 1097 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1098 iscsi_free_session(session);
1099 return 0;
1100}
7b8631b5
MC		 1101EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1102
7b8631b5
MC		 1103/**
1104 * iscsi_create_conn - create iscsi class connection
1105 * @session: iscsi cls session
5d91e209 1106 * @dd_size: private driver data size
7b8631b5
MC		 1107 * @cid: connection id
1108 *
1109 * This can be called from a LLD or iscsi_transport. The connection
1110 * is child of the session so cid must be unique for all connections
1111 * on the session.
b5c7a12d
MC		 1112 *
1113 * Since we do not support MCS, cid will normally be zero. In some cases
1114 * for software iscsi we could be trying to preallocate a connection struct
1115 * in which case there could be two connection structs and cid would be
1116 * non-zero.
eb44820c 1117 */
7b8631b5 1118struct iscsi_cls_conn *
5d91e209 1119iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1120{
1121 struct iscsi_transport *transport = session->transport;
7b8631b5 1122 struct iscsi_cls_conn *conn;
26974789 1123 unsigned long flags;
7b8631b5
MC		 1124 int err;
1125
5d91e209 1126 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1127 if (!conn)
1128 return NULL;
5d91e209 1129 if (dd_size)
7b8631b5
MC		 1130 conn->dd_data = &conn[1];
1131
22a39fbb 1132 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1133 INIT_LIST_HEAD(&conn->conn_list);
1134 conn->transport = transport;
b5c7a12d 1135 conn->cid = cid;
7b8631b5
MC		 1136
1137 /* this is released in the dev's release function */
1138 if (!get_device(&session->dev))
43a145a3 1139 goto free_conn;
b5c7a12d 1140
71610f55 1141 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1142 conn->dev.parent = &session->dev;
1143 conn->dev.release = iscsi_conn_release;
1144 err = device_register(&conn->dev);
1145 if (err) {
322d739d
MC		 1146 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1147 "register connection's dev\n");
7b8631b5
MC		 1148 goto release_parent_ref;
1149 }
1150 transport_register_device(&conn->dev);
26974789
MC		 1151
1152 spin_lock_irqsave(&connlock, flags);
1153 list_add(&conn->conn_list, &connlist);
26974789 1154 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1155
1156 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1157 return conn;
1158
1159release_parent_ref:
1160 put_device(&session->dev);
1161free_conn:
1162 kfree(conn);
1163 return NULL;
1164}
1165
1166EXPORT_SYMBOL_GPL(iscsi_create_conn);
1167
1168/**
1169 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1170 * @conn: iscsi cls session
7b8631b5 1171 *
26974789 1172 * This can be called from a LLD or iscsi_transport.
eb44820c 1173 */
7b8631b5
MC		 1174int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1175{
26974789
MC		 1176 unsigned long flags;
1177
1178 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1179 list_del(&conn->conn_list);
1180 spin_unlock_irqrestore(&connlock, flags);
1181
7b8631b5 1182 transport_unregister_device(&conn->dev);
632248aa 1183 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1184 device_unregister(&conn->dev);
1185 return 0;
1186}
7b8631b5
MC		 1187EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1188
7b8631b5
MC		 1189/*
1190 * iscsi interface functions
1191 */
0896b752
AA		 1192static struct iscsi_internal *
1193iscsi_if_transport_lookup(struct iscsi_transport *tt)
1194{
1195 struct iscsi_internal *priv;
1196 unsigned long flags;
1197
1198 spin_lock_irqsave(&iscsi_transport_lock, flags);
1199 list_for_each_entry(priv, &iscsi_transports, list) {
1200 if (tt == priv->iscsi_transport) {
1201 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1202 return priv;
1203 }
1204 }
1205 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1206 return NULL;
1207}
1da177e4 1208
53cb8a1f 1209static int
43514774 1210iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1211{
43514774 1212 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1213}
1da177e4 1214
7b7232f3 1215int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1216 char *data, uint32_t data_size)
1da177e4 1217{
0896b752
AA		 1218 struct nlmsghdr *nlh;
1219 struct sk_buff *skb;
1220 struct iscsi_uevent *ev;
0896b752 1221 char *pdu;
790f39a2 1222 struct iscsi_internal *priv;
0896b752
AA		 1223 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1224 data_size);
1225
790f39a2
MC		 1226 priv = iscsi_if_transport_lookup(conn->transport);
1227 if (!priv)
1228 return -EINVAL;
1229
43a145a3 1230 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1231 if (!skb) {
e5bd7b54 1232 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1233 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1234 "control PDU: OOM\n");
0896b752
AA		 1235 return -ENOMEM;
1236 }
1da177e4 1237
43514774 1238 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1239 ev = NLMSG_DATA(nlh);
1240 memset(ev, 0, sizeof(*ev));
1241 ev->transport_handle = iscsi_handle(conn->transport);
1242 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1243 ev->r.recv_req.cid = conn->cid;
1244 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1245 pdu = (char*)ev + sizeof(*ev);
1246 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1247 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1248
43514774 1249 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1250}
0896b752 1251EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1252
43514774
MC		 1253int iscsi_offload_mesg(struct Scsi_Host *shost,
1254 struct iscsi_transport *transport, uint32_t type,
1255 char *data, uint16_t data_size)
1256{
1257 struct nlmsghdr *nlh;
1258 struct sk_buff *skb;
1259 struct iscsi_uevent *ev;
1260 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1261
a541f840 1262 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1263 if (!skb) {
1264 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1265 return -ENOMEM;
1266 }
1267
1268 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1269 ev = NLMSG_DATA(nlh);
1270 memset(ev, 0, sizeof(*ev));
1271 ev->type = type;
1272 ev->transport_handle = iscsi_handle(transport);
1273 switch (type) {
1274 case ISCSI_KEVENT_PATH_REQ:
1275 ev->r.req_path.host_no = shost->host_no;
1276 break;
1277 case ISCSI_KEVENT_IF_DOWN:
1278 ev->r.notify_if_down.host_no = shost->host_no;
1279 break;
1280 }
1281
1282 memcpy((char *)ev + sizeof(*ev), data, data_size);
1283
a541f840 1284 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1285}
1286EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1287
e5bd7b54 1288void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1289{
0896b752
AA		 1290 struct nlmsghdr *nlh;
1291 struct sk_buff *skb;
1292 struct iscsi_uevent *ev;
790f39a2 1293 struct iscsi_internal *priv;
0896b752
AA		 1294 int len = NLMSG_SPACE(sizeof(*ev));
1295
790f39a2
MC		 1296 priv = iscsi_if_transport_lookup(conn->transport);
1297 if (!priv)
1298 return;
1299
43a145a3 1300 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1301 if (!skb) {
322d739d
MC		 1302 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1303 "conn error (%d)\n", error);
0896b752
AA		 1304 return;
1305 }
1306
43514774 1307 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1308 ev = NLMSG_DATA(nlh);
1309 ev->transport_handle = iscsi_handle(conn->transport);
1310 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1311 ev->r.connerror.error = error;
b5c7a12d
MC		 1312 ev->r.connerror.cid = conn->cid;
1313 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1314
43514774 1315 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1316
322d739d
MC		 1317 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1318 error);
0896b752 1319}
e5bd7b54 1320EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752
AA		 1321
1322static int
43514774
MC		 1323iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1324 void *payload, int size)
0896b752
AA		 1325{
1326 struct sk_buff *skb;
1327 struct nlmsghdr *nlh;
1328 int len = NLMSG_SPACE(size);
1329 int flags = multi ? NLM_F_MULTI : 0;
1330 int t = done ? NLMSG_DONE : type;
1331
43a145a3 1332 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1333 if (!skb) {
1334 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1335 return -ENOMEM;
1336 }
0896b752 1337
43514774 1338 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1339 nlh->nlmsg_flags = flags;
1340 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1341 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1342}
1da177e4 1343
7b8631b5 1344static int
5b940adf 1345iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1346{
1347 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1348 struct iscsi_stats *stats;
1349 struct sk_buff *skbstat;
1350 struct iscsi_cls_conn *conn;
1351 struct nlmsghdr *nlhstat;
1352 struct iscsi_uevent *evstat;
790f39a2 1353 struct iscsi_internal *priv;
7b8631b5
MC		 1354 int len = NLMSG_SPACE(sizeof(*ev) +
1355 sizeof(struct iscsi_stats) +
1356 sizeof(struct iscsi_stats_custom) *
1357 ISCSI_STATS_CUSTOM_MAX);
1358 int err = 0;
0896b752 1359
790f39a2
MC		 1360 priv = iscsi_if_transport_lookup(transport);
1361 if (!priv)
1362 return -EINVAL;
1363
b5c7a12d 1364 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1365 if (!conn)
1366 return -EEXIST;
0896b752 1367
7b8631b5
MC		 1368 do {
1369 int actual_size;
0896b752 1370
43a145a3 1371 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1372 if (!skbstat) {
322d739d
MC		 1373 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1374 "deliver stats: OOM\n");
7b8631b5
MC		 1375 return -ENOMEM;
1376 }
1377
43514774 1378 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1379 (len - sizeof(*nlhstat)), 0);
1380 evstat = NLMSG_DATA(nlhstat);
1381 memset(evstat, 0, sizeof(*evstat));
1382 evstat->transport_handle = iscsi_handle(conn->transport);
1383 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1384 evstat->u.get_stats.cid =
1385 ev->u.get_stats.cid;
1386 evstat->u.get_stats.sid =
1387 ev->u.get_stats.sid;
7b8631b5
MC		 1388 stats = (struct iscsi_stats *)
1389 ((char*)evstat + sizeof(*evstat));
1390 memset(stats, 0, sizeof(*stats));
1391
7b7232f3 1392 transport->get_stats(conn, stats);
7b8631b5
MC		 1393 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1394 sizeof(struct iscsi_stats) +
1395 sizeof(struct iscsi_stats_custom) *
1396 stats->custom_length);
1397 actual_size -= sizeof(*nlhstat);
1398 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1399 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1400 nlhstat->nlmsg_len = actual_size;
1401
43514774
MC		 1402 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1403 GFP_ATOMIC);
7b8631b5
MC		 1404 } while (err < 0 && err != -ECONNREFUSED);
1405
1406 return err;
0896b752
AA		 1407}
1408
53cb8a1f 1409/**
26974789
MC		 1410 * iscsi_session_event - send session destr. completion event
1411 * @session: iscsi class session
1412 * @event: type of event
eb44820c 1413 */
26974789
MC		 1414int iscsi_session_event(struct iscsi_cls_session *session,
1415 enum iscsi_uevent_e event)
53cb8a1f
MC		 1416{
1417 struct iscsi_internal *priv;
53cb8a1f
MC		 1418 struct Scsi_Host *shost;
1419 struct iscsi_uevent *ev;
1420 struct sk_buff *skb;
1421 struct nlmsghdr *nlh;
53cb8a1f
MC		 1422 int rc, len = NLMSG_SPACE(sizeof(*ev));
1423
26974789 1424 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1425 if (!priv)
1426 return -EINVAL;
53cb8a1f
MC		 1427 shost = iscsi_session_to_shost(session);
1428
43a145a3 1429 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1430 if (!skb) {
322d739d
MC		 1431 iscsi_cls_session_printk(KERN_ERR, session,
1432 "Cannot notify userspace of session "
1433 "event %u\n", event);
53cb8a1f
MC		 1434 return -ENOMEM;
1435 }
1436
43514774 1437 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1438 ev = NLMSG_DATA(nlh);
26974789 1439 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1440
26974789
MC		 1441 ev->type = event;
1442 switch (event) {
1443 case ISCSI_KEVENT_DESTROY_SESSION:
1444 ev->r.d_session.host_no = shost->host_no;
1445 ev->r.d_session.sid = session->sid;
1446 break;
1447 case ISCSI_KEVENT_CREATE_SESSION:
1448 ev->r.c_session_ret.host_no = shost->host_no;
1449 ev->r.c_session_ret.sid = session->sid;
1450 break;
1451 case ISCSI_KEVENT_UNBIND_SESSION:
1452 ev->r.unbind_session.host_no = shost->host_no;
1453 ev->r.unbind_session.sid = session->sid;
1454 break;
1455 default:
322d739d
MC		 1456 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1457 "%u.\n", event);
26974789 1458 kfree_skb(skb);
53cb8a1f 1459 return -EINVAL;
53cb8a1f
MC		 1460 }
1461
53cb8a1f
MC		 1462 /*
1463 * this will occur if the daemon is not up, so we just warn
1464 * the user and when the daemon is restarted it will handle it
1465 */
43514774 1466 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1467 if (rc == -ESRCH)
322d739d
MC		 1468 iscsi_cls_session_printk(KERN_ERR, session,
1469 "Cannot notify userspace of session "
1470 "event %u. Check iscsi daemon\n",
1471 event);
632248aa
MC		 1472
1473 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1474 event, rc);
53cb8a1f
MC		 1475 return rc;
1476}
26974789 1477EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1478
0896b752 1479static int
d82ff9be
MC		 1480iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1481 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1482 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1483{
1484 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1485 struct iscsi_cls_session *session;
5e7facb7 1486 struct Scsi_Host *shost;
0896b752 1487
d82ff9be 1488 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1489 initial_cmdsn);
7b7232f3 1490 if (!session)
7b8631b5 1491 return -ENOMEM;
0896b752 1492
5e7facb7
MC		 1493 shost = iscsi_session_to_shost(session);
1494 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1495 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1496 ISCSI_DBG_TRANS_SESSION(session,
1497 "Completed creating transport session\n");
0896b752 1498 return 0;
0896b752
AA		 1499}
1500
1501static int
7b7232f3 1502iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1503{
7b8631b5 1504 struct iscsi_cls_conn *conn;
7b7232f3 1505 struct iscsi_cls_session *session;
7b8631b5 1506
b5c7a12d
MC		 1507 session = iscsi_session_lookup(ev->u.c_conn.sid);
1508 if (!session) {
322d739d 1509 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1510 ev->u.c_conn.sid);
7b8631b5 1511 return -EINVAL;
b5c7a12d 1512 }
0896b752 1513
7b7232f3 1514 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1515 if (!conn) {
322d739d
MC		 1516 iscsi_cls_session_printk(KERN_ERR, session,
1517 "couldn't create a new connection.");
7b7232f3 1518 return -ENOMEM;
b5c7a12d 1519 }
0896b752 1520
b5c7a12d
MC		 1521 ev->r.c_conn_ret.sid = session->sid;
1522 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1523
1524 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1525 return 0;
1da177e4
LT		 1526}
1527
0896b752
AA		 1528static int
1529iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1530{
7b8631b5 1531 struct iscsi_cls_conn *conn;
0896b752 1532
b5c7a12d 1533 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1534 if (!conn)
7b8631b5 1535 return -EINVAL;
0896b752 1536
632248aa 1537 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1538 if (transport->destroy_conn)
1539 transport->destroy_conn(conn);
632248aa 1540
7b8631b5 1541 return 0;
0896b752
AA		 1542}
1543
fd7255f5
MC		 1544static int
1545iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1546{
1547 char *data = (char*)ev + sizeof(*ev);
1548 struct iscsi_cls_conn *conn;
1549 struct iscsi_cls_session *session;
a54a52ca 1550 int err = 0, value = 0;
fd7255f5
MC		 1551
1552 session = iscsi_session_lookup(ev->u.set_param.sid);
1553 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1554 if (!conn || !session)
1555 return -EINVAL;
1556
1557 switch (ev->u.set_param.param) {
30a6c652 1558 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1559 sscanf(data, "%d", &value);
fdd46dcb 1560 session->recovery_tmo = value;
30a6c652 1561 break;
fd7255f5 1562 default:
a54a52ca
MC		 1563 err = transport->set_param(conn, ev->u.set_param.param,
1564 data, ev->u.set_param.len);
fd7255f5
MC		 1565 }
1566
1567 return err;
1568}
1569
10eb0f01
MC		 1570static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1571 struct iscsi_uevent *ev, int msg_type)
1572{
1573 struct iscsi_endpoint *ep;
1574 struct sockaddr *dst_addr;
1575 struct Scsi_Host *shost = NULL;
1576 int non_blocking, err = 0;
1577
1578 if (!transport->ep_connect)
1579 return -EINVAL;
1580
1581 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1582 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1583 if (!shost) {
1584 printk(KERN_ERR "ep connect failed. Could not find "
1585 "host no %u\n",
1586 ev->u.ep_connect_through_host.host_no);
1587 return -ENODEV;
1588 }
1589 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1590 } else
1591 non_blocking = ev->u.ep_connect.non_blocking;
1592
1593 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1594 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1595 if (IS_ERR(ep)) {
1596 err = PTR_ERR(ep);
1597 goto release_host;
1598 }
1599
1600 ev->r.ep_connect_ret.handle = ep->id;
1601release_host:
1602 if (shost)
1603 scsi_host_put(shost);
1604 return err;
1605}
1606
22a39fbb
MC		 1607static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1608 u64 ep_handle)
1609{
1610 struct iscsi_cls_conn *conn;
1611 struct iscsi_endpoint *ep;
1612
1613 if (!transport->ep_disconnect)
1614 return -EINVAL;
1615
1616 ep = iscsi_lookup_endpoint(ep_handle);
1617 if (!ep)
1618 return -EINVAL;
1619 conn = ep->conn;
1620 if (conn) {
1621 mutex_lock(&conn->ep_mutex);
1622 conn->ep = NULL;
1623 mutex_unlock(&conn->ep_mutex);
1624 }
1625
1626 transport->ep_disconnect(ep);
1627 return 0;
1628}
1629
264faaaa
OG		 1630static int
1631iscsi_if_transport_ep(struct iscsi_transport *transport,
1632 struct iscsi_uevent *ev, int msg_type)
1633{
d82ff9be 1634 struct iscsi_endpoint *ep;
264faaaa
OG		 1635 int rc = 0;
1636
1637 switch (msg_type) {
10eb0f01 1638 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1639 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1640 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1641 break;
1642 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1643 if (!transport->ep_poll)
1644 return -EINVAL;
1645
d82ff9be
MC		 1646 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1647 if (!ep)
1648 return -EINVAL;
1649
1650 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1651 ev->u.ep_poll.timeout_ms);
1652 break;
1653 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1654 rc = iscsi_if_ep_disconnect(transport,
1655 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1656 break;
1657 }
1658 return rc;
1659}
1660
01cb225d
MC		 1661static int
1662iscsi_tgt_dscvr(struct iscsi_transport *transport,
1663 struct iscsi_uevent *ev)
1664{
2174a04e 1665 struct Scsi_Host *shost;
01cb225d 1666 struct sockaddr *dst_addr;
2174a04e 1667 int err;
01cb225d
MC		 1668
1669 if (!transport->tgt_dscvr)
1670 return -EINVAL;
1671
2174a04e 1672 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1673 if (!shost) {
2174a04e
MC		 1674 printk(KERN_ERR "target discovery could not find host no %u\n",
1675 ev->u.tgt_dscvr.host_no);
1676 return -ENODEV;
1677 }
1678
1679
01cb225d 1680 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1681 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1682 ev->u.tgt_dscvr.enable, dst_addr);
1683 scsi_host_put(shost);
1684 return err;
01cb225d
MC		 1685}
1686
1d9bf13a
MC		 1687static int
1688iscsi_set_host_param(struct iscsi_transport *transport,
1689 struct iscsi_uevent *ev)
1690{
1691 char *data = (char*)ev + sizeof(*ev);
1692 struct Scsi_Host *shost;
1693 int err;
1694
1695 if (!transport->set_host_param)
1696 return -ENOSYS;
1697
1698 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1699 if (!shost) {
1d9bf13a
MC		 1700 printk(KERN_ERR "set_host_param could not find host no %u\n",
1701 ev->u.set_host_param.host_no);
1702 return -ENODEV;
1703 }
1704
1705 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1706 data, ev->u.set_host_param.len);
1707 scsi_host_put(shost);
1708 return err;
1709}
1710
0896b752 1711static int
43514774
MC		 1712iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1713{
1714 struct Scsi_Host *shost;
1715 struct iscsi_path *params;
1716 int err;
1717
1718 if (!transport->set_path)
1719 return -ENOSYS;
1720
1721 shost = scsi_host_lookup(ev->u.set_path.host_no);
1722 if (!shost) {
1723 printk(KERN_ERR "set path could not find host no %u\n",
1724 ev->u.set_path.host_no);
1725 return -ENODEV;
1726 }
1727
1728 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1729 err = transport->set_path(shost, params);
1730
1731 scsi_host_put(shost);
1732 return err;
1733}
1734
56c155b5
MC		 1735static int
1736iscsi_set_iface_params(struct iscsi_transport *transport,
1737 struct iscsi_uevent *ev)
1738{
1739 char *data = (char *)ev + sizeof(*ev);
1740 struct Scsi_Host *shost;
1741 int err;
1742
1743 if (!transport->set_iface_param)
1744 return -ENOSYS;
1745
1746 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1747 if (!shost) {
1748 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1749 ev->u.set_iface_params.host_no);
1750 return -ENODEV;
1751 }
1752
1753 err = transport->set_iface_param(shost, data,
1754 ev->u.set_iface_params.count);
1755 scsi_host_put(shost);
1756 return err;
1757}
1758
43514774
MC		 1759static int
1760iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 1761{
1762 int err = 0;
1763 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1764 struct iscsi_transport *transport = NULL;
1765 struct iscsi_internal *priv;
7b7232f3
MC		 1766 struct iscsi_cls_session *session;
1767 struct iscsi_cls_conn *conn;
d82ff9be 1768 struct iscsi_endpoint *ep = NULL;
0896b752 1769
43514774
MC		 1770 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1771 *group = ISCSI_NL_GRP_UIP;
1772 else
1773 *group = ISCSI_NL_GRP_ISCSID;
1774
0896b752
AA		 1775 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1776 if (!priv)
1777 return -EINVAL;
1778 transport = priv->iscsi_transport;
1779
7b7232f3
MC		 1780 if (!try_module_get(transport->owner))
1781 return -EINVAL;
1782
0896b752
AA		 1783 switch (nlh->nlmsg_type) {
1784 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1785 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1786 ev->u.c_session.initial_cmdsn,
1787 ev->u.c_session.cmds_max,
1788 ev->u.c_session.queue_depth);
1789 break;
1790 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1791 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1792 if (!ep) {
1793 err = -EINVAL;
1794 break;
1795 }
d82ff9be
MC		 1796
1797 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1798 ev->u.c_bound_session.initial_cmdsn,
1799 ev->u.c_bound_session.cmds_max,
1800 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1801 break;
1802 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1803 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1804 if (session)
7b7232f3 1805 transport->destroy_session(session);
26974789
MC		 1806 else
1807 err = -EINVAL;
1808 break;
1809 case ISCSI_UEVENT_UNBIND_SESSION:
1810 session = iscsi_session_lookup(ev->u.d_session.sid);
1811 if (session)
06d25af4
MC		 1812 scsi_queue_work(iscsi_session_to_shost(session),
1813 &session->unbind_work);
26974789 1814 else
7b7232f3 1815 err = -EINVAL;
0896b752
AA		 1816 break;
1817 case ISCSI_UEVENT_CREATE_CONN:
1818 err = iscsi_if_create_conn(transport, ev);
1819 break;
1820 case ISCSI_UEVENT_DESTROY_CONN:
1821 err = iscsi_if_destroy_conn(transport, ev);
1822 break;
1823 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1824 session = iscsi_session_lookup(ev->u.b_conn.sid);
1825 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 1826
22a39fbb
MC		 1827 if (conn && conn->ep)
1828 iscsi_if_ep_disconnect(transport, conn->ep->id);
1829
1830 if (!session || !conn) {
7b7232f3 1831 err = -EINVAL;
22a39fbb
MC		 1832 break;
1833 }
1834
1835 ev->r.retcode = transport->bind_conn(session, conn,
1836 ev->u.b_conn.transport_eph,
1837 ev->u.b_conn.is_leading);
1838 if (ev->r.retcode || !transport->ep_connect)
1839 break;
1840
1841 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1842 if (ep) {
1843 ep->conn = conn;
1844
1845 mutex_lock(&conn->ep_mutex);
1846 conn->ep = ep;
1847 mutex_unlock(&conn->ep_mutex);
1848 } else
1849 iscsi_cls_conn_printk(KERN_ERR, conn,
1850 "Could not set ep conn "
1851 "binding\n");
0896b752
AA		 1852 break;
1853 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 1854 err = iscsi_set_param(transport, ev);
0896b752
AA		 1855 break;
1856 case ISCSI_UEVENT_START_CONN:
b5c7a12d 1857 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 1858 if (conn)
1859 ev->r.retcode = transport->start_conn(conn);
1860 else
1861 err = -EINVAL;
0896b752
AA		 1862 break;
1863 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 1864 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 1865 if (conn)
1866 transport->stop_conn(conn, ev->u.stop_conn.flag);
1867 else
1868 err = -EINVAL;
0896b752
AA		 1869 break;
1870 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 1871 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 1872 if (conn)
1873 ev->r.retcode = transport->send_pdu(conn,
1874 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1875 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1876 ev->u.send_pdu.data_size);
1877 else
1878 err = -EINVAL;
0896b752
AA		 1879 break;
1880 case ISCSI_UEVENT_GET_STATS:
5b940adf 1881 err = iscsi_if_get_stats(transport, nlh);
0896b752 1882 break;
264faaaa
OG		 1883 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1884 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1885 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 1886 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 1887 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1888 break;
01cb225d
MC		 1889 case ISCSI_UEVENT_TGT_DSCVR:
1890 err = iscsi_tgt_dscvr(transport, ev);
1891 break;
1d9bf13a
MC		 1892 case ISCSI_UEVENT_SET_HOST_PARAM:
1893 err = iscsi_set_host_param(transport, ev);
1894 break;
43514774
MC		 1895 case ISCSI_UEVENT_PATH_UPDATE:
1896 err = iscsi_set_path(transport, ev);
1897 break;
56c155b5
MC		 1898 case ISCSI_UEVENT_SET_IFACE_PARAMS:
1899 err = iscsi_set_iface_params(transport, ev);
1900 break;
0896b752 1901 default:
1d9bf13a 1902 err = -ENOSYS;
0896b752
AA		 1903 break;
1904 }
1905
7b7232f3 1906 module_put(transport->owner);
0896b752
AA		 1907 return err;
1908}
1909
b5c7a12d 1910/*
cd40b7d3
DL		 1911 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1912 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 1913 */
0896b752 1914static void
cd40b7d3 1915iscsi_if_rx(struct sk_buff *skb)
0896b752 1916{
0b950672 1917 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 1918 while (skb->len >= NLMSG_SPACE(0)) {
1919 int err;
1920 uint32_t rlen;
1921 struct nlmsghdr *nlh;
1922 struct iscsi_uevent *ev;
43514774 1923 uint32_t group;
cd40b7d3
DL		 1924
1925 nlh = nlmsg_hdr(skb);
1926 if (nlh->nlmsg_len < sizeof(*nlh) ||
1927 skb->len < nlh->nlmsg_len) {
1928 break;
ee7f8e40 1929 }
ee7f8e40 1930
cd40b7d3
DL		 1931 ev = NLMSG_DATA(nlh);
1932 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1933 if (rlen > skb->len)
1934 rlen = skb->len;
0896b752 1935
43514774 1936 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 1937 if (err) {
1938 ev->type = ISCSI_KEVENT_IF_ERROR;
1939 ev->iferror = err;
0896b752 1940 }
cd40b7d3
DL		 1941 do {
1942 /*
1943 * special case for GET_STATS:
1944 * on success - sending reply and stats from
1945 * inside of if_recv_msg(),
1946 * on error - fall through.
1947 */
1948 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1949 break;
43514774 1950 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3
DL		 1951 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1952 } while (err < 0 && err != -ECONNREFUSED);
1953 skb_pull(skb, rlen);
0896b752 1954 }
0b950672 1955 mutex_unlock(&rx_queue_mutex);
0896b752 1956}
1da177e4 1957
fd7255f5 1958#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 1959struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 1960 __ATTR(_name,_mode,_show,_store)
1961
1da177e4 1962/*
0896b752 1963 * iSCSI connection attrs
1da177e4 1964 */
a54a52ca 1965#define iscsi_conn_attr_show(param) \
0896b752 1966static ssize_t \
ee959b00
TJ		 1967show_conn_param_##param(struct device *dev, \
1968 struct device_attribute *attr, char *buf) \
0896b752 1969{ \
ee959b00 1970 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 1971 struct iscsi_transport *t = conn->transport; \
a54a52ca 1972 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 1973}
1974
a54a52ca
MC		 1975#define iscsi_conn_attr(field, param) \
1976 iscsi_conn_attr_show(param) \
1977static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 1978 NULL);
0896b752 1979
a54a52ca
MC		 1980iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1981iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1982iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1983iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1984iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1985iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1986iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 1987iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1988iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 1989iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1990iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 1991
289324b0
MC		 1992#define iscsi_conn_ep_attr_show(param) \
1993static ssize_t show_conn_ep_param_##param(struct device *dev, \
1994 struct device_attribute *attr,\
1995 char *buf) \
1996{ \
1997 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1998 struct iscsi_transport *t = conn->transport; \
1999 struct iscsi_endpoint *ep; \
2000 ssize_t rc; \
2001 \
2002 /* \
2003 * Need to make sure ep_disconnect does not free the LLD's \
2004 * interconnect resources while we are trying to read them. \
2005 */ \
2006 mutex_lock(&conn->ep_mutex); \
2007 ep = conn->ep; \
2008 if (!ep && t->ep_connect) { \
2009 mutex_unlock(&conn->ep_mutex); \
2010 return -ENOTCONN; \
2011 } \
2012 \
2013 if (ep) \
2014 rc = t->get_ep_param(ep, param, buf); \
2015 else \
2016 rc = t->get_conn_param(conn, param, buf); \
2017 mutex_unlock(&conn->ep_mutex); \
2018 return rc; \
2019}
2020
2021#define iscsi_conn_ep_attr(field, param) \
2022 iscsi_conn_ep_attr_show(param) \
2023static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2024 show_conn_ep_param_##param, NULL);
2025
2026iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2027iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2028
3128c6c7
MC		 2029static struct attribute *iscsi_conn_attrs[] = {
2030 &dev_attr_conn_max_recv_dlength.attr,
2031 &dev_attr_conn_max_xmit_dlength.attr,
2032 &dev_attr_conn_header_digest.attr,
2033 &dev_attr_conn_data_digest.attr,
2034 &dev_attr_conn_ifmarker.attr,
2035 &dev_attr_conn_ofmarker.attr,
2036 &dev_attr_conn_address.attr,
2037 &dev_attr_conn_port.attr,
2038 &dev_attr_conn_exp_statsn.attr,
2039 &dev_attr_conn_persistent_address.attr,
2040 &dev_attr_conn_persistent_port.attr,
2041 &dev_attr_conn_ping_tmo.attr,
2042 &dev_attr_conn_recv_tmo.attr,
2043 NULL,
2044};
2045
2046static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2047 struct attribute *attr, int i)
2048{
2049 struct device *cdev = container_of(kobj, struct device, kobj);
2050 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2051 struct iscsi_transport *t = conn->transport;
2052 int param;
2053
2054 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2055 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2056 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2057 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2058 else if (attr == &dev_attr_conn_header_digest.attr)
2059 param = ISCSI_PARAM_HDRDGST_EN;
2060 else if (attr == &dev_attr_conn_data_digest.attr)
2061 param = ISCSI_PARAM_DATADGST_EN;
2062 else if (attr == &dev_attr_conn_ifmarker.attr)
2063 param = ISCSI_PARAM_IFMARKER_EN;
2064 else if (attr == &dev_attr_conn_ofmarker.attr)
2065 param = ISCSI_PARAM_OFMARKER_EN;
2066 else if (attr == &dev_attr_conn_address.attr)
2067 param = ISCSI_PARAM_CONN_ADDRESS;
2068 else if (attr == &dev_attr_conn_port.attr)
2069 param = ISCSI_PARAM_CONN_PORT;
2070 else if (attr == &dev_attr_conn_exp_statsn.attr)
2071 param = ISCSI_PARAM_EXP_STATSN;
2072 else if (attr == &dev_attr_conn_persistent_address.attr)
2073 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2074 else if (attr == &dev_attr_conn_persistent_port.attr)
2075 param = ISCSI_PARAM_PERSISTENT_PORT;
2076 else if (attr == &dev_attr_conn_ping_tmo.attr)
2077 param = ISCSI_PARAM_PING_TMO;
2078 else if (attr == &dev_attr_conn_recv_tmo.attr)
2079 param = ISCSI_PARAM_RECV_TMO;
2080 else {
2081 WARN_ONCE(1, "Invalid conn attr");
2082 return 0;
2083 }
2084
2085 return t->attr_is_visible(ISCSI_PARAM, param);
2086}
2087
2088static struct attribute_group iscsi_conn_group = {
2089 .attrs = iscsi_conn_attrs,
2090 .is_visible = iscsi_conn_attr_is_visible,
2091};
2092
1da177e4 2093/*
0896b752 2094 * iSCSI session attrs
1da177e4 2095 */
b2c64167 2096#define iscsi_session_attr_show(param, perm) \
fd7255f5 2097static ssize_t \
ee959b00
TJ		 2098show_session_param_##param(struct device *dev, \
2099 struct device_attribute *attr, char *buf) \
fd7255f5 2100{ \
ee959b00
TJ		 2101 struct iscsi_cls_session *session = \
2102 iscsi_dev_to_session(dev->parent); \
fd7255f5 2103 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2104 \
2105 if (perm && !capable(CAP_SYS_ADMIN)) \
2106 return -EACCES; \
a54a52ca 2107 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2108}
2109
b2c64167
MC		 2110#define iscsi_session_attr(field, param, perm) \
2111 iscsi_session_attr_show(param, perm) \
a54a52ca 2112static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5 2113 NULL);
b2c64167
MC		 2114iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2115iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2116iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2117iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2118iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2119iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2120iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2121iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2122iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2123iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2124iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2125iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2126iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2127iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 2128iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2129iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2130iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2131iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2132iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2133iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2134iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2135
6eabafbe 2136static ssize_t
ee959b00
TJ		 2137show_priv_session_state(struct device *dev, struct device_attribute *attr,
2138 char *buf)
6eabafbe 2139{
ee959b00 2140 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2141 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2142}
2143static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2144 NULL);
2145
fd7255f5
MC		 2146#define iscsi_priv_session_attr_show(field, format) \
2147static ssize_t \
ee959b00
TJ		 2148show_priv_session_##field(struct device *dev, \
2149 struct device_attribute *attr, char *buf) \
fd7255f5 2150{ \
ee959b00
TJ		 2151 struct iscsi_cls_session *session = \
2152 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2153 if (session->field == -1) \
2154 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2155 return sprintf(buf, format"\n", session->field); \
2156}
2157
fe4f0bde
VC		 2158#define iscsi_priv_session_attr_store(field) \
2159static ssize_t \
2160store_priv_session_##field(struct device *dev, \
2161 struct device_attribute *attr, \
2162 const char *buf, size_t count) \
2163{ \
2164 int val; \
2165 char *cp; \
2166 struct iscsi_cls_session *session = \
2167 iscsi_dev_to_session(dev->parent); \
2168 if ((session->state == ISCSI_SESSION_FREE) || \
2169 (session->state == ISCSI_SESSION_FAILED)) \
2170 return -EBUSY; \
2171 if (strncmp(buf, "off", 3) == 0) \
2172 session->field = -1; \
2173 else { \
2174 val = simple_strtoul(buf, &cp, 0); \
2175 if (*cp != '\0' && *cp != '\n') \
2176 return -EINVAL; \
2177 session->field = val; \
2178 } \
2179 return count; \
2180}
2181
2182#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2183 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2184 iscsi_priv_session_attr_store(field) \
523f3c80 2185static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2186 show_priv_session_##field, \
2187 store_priv_session_##field)
2188iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2189
1d063c17
MC		 2190static struct attribute *iscsi_session_attrs[] = {
2191 &dev_attr_sess_initial_r2t.attr,
2192 &dev_attr_sess_max_outstanding_r2t.attr,
2193 &dev_attr_sess_immediate_data.attr,
2194 &dev_attr_sess_first_burst_len.attr,
2195 &dev_attr_sess_max_burst_len.attr,
2196 &dev_attr_sess_data_pdu_in_order.attr,
2197 &dev_attr_sess_data_seq_in_order.attr,
2198 &dev_attr_sess_erl.attr,
2199 &dev_attr_sess_targetname.attr,
2200 &dev_attr_sess_tpgt.attr,
2201 &dev_attr_sess_password.attr,
2202 &dev_attr_sess_password_in.attr,
2203 &dev_attr_sess_username.attr,
2204 &dev_attr_sess_username_in.attr,
2205 &dev_attr_sess_fast_abort.attr,
2206 &dev_attr_sess_abort_tmo.attr,
2207 &dev_attr_sess_lu_reset_tmo.attr,
2208 &dev_attr_sess_tgt_reset_tmo.attr,
2209 &dev_attr_sess_ifacename.attr,
2210 &dev_attr_sess_initiatorname.attr,
2211 &dev_attr_sess_targetalias.attr,
2212 &dev_attr_priv_sess_recovery_tmo.attr,
2213 &dev_attr_priv_sess_state.attr,
2214 NULL,
2215};
2216
2217static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2218 struct attribute *attr, int i)
2219{
2220 struct device *cdev = container_of(kobj, struct device, kobj);
2221 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2222 struct iscsi_transport *t = session->transport;
2223 int param;
2224
2225 if (attr == &dev_attr_sess_initial_r2t.attr)
2226 param = ISCSI_PARAM_INITIAL_R2T_EN;
2227 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2228 param = ISCSI_PARAM_MAX_R2T;
2229 else if (attr == &dev_attr_sess_immediate_data.attr)
2230 param = ISCSI_PARAM_IMM_DATA_EN;
2231 else if (attr == &dev_attr_sess_first_burst_len.attr)
2232 param = ISCSI_PARAM_FIRST_BURST;
2233 else if (attr == &dev_attr_sess_max_burst_len.attr)
2234 param = ISCSI_PARAM_MAX_BURST;
2235 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2236 param = ISCSI_PARAM_PDU_INORDER_EN;
2237 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2238 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2239 else if (attr == &dev_attr_sess_erl.attr)
2240 param = ISCSI_PARAM_ERL;
2241 else if (attr == &dev_attr_sess_targetname.attr)
2242 param = ISCSI_PARAM_TARGET_NAME;
2243 else if (attr == &dev_attr_sess_tpgt.attr)
2244 param = ISCSI_PARAM_TPGT;
2245 else if (attr == &dev_attr_sess_password.attr)
2246 param = ISCSI_PARAM_USERNAME;
2247 else if (attr == &dev_attr_sess_password_in.attr)
2248 param = ISCSI_PARAM_USERNAME_IN;
2249 else if (attr == &dev_attr_sess_username.attr)
2250 param = ISCSI_PARAM_PASSWORD;
2251 else if (attr == &dev_attr_sess_username_in.attr)
2252 param = ISCSI_PARAM_PASSWORD_IN;
2253 else if (attr == &dev_attr_sess_fast_abort.attr)
2254 param = ISCSI_PARAM_FAST_ABORT;
2255 else if (attr == &dev_attr_sess_abort_tmo.attr)
2256 param = ISCSI_PARAM_ABORT_TMO;
2257 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2258 param = ISCSI_PARAM_LU_RESET_TMO;
2259 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2260 param = ISCSI_PARAM_TGT_RESET_TMO;
2261 else if (attr == &dev_attr_sess_ifacename.attr)
2262 param = ISCSI_PARAM_IFACE_NAME;
2263 else if (attr == &dev_attr_sess_initiatorname.attr)
2264 param = ISCSI_PARAM_INITIATOR_NAME;
2265 else if (attr == &dev_attr_sess_targetalias.attr)
2266 param = ISCSI_PARAM_TARGET_ALIAS;
2267 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2268 return S_IRUGO | S_IWUSR;
2269 else if (attr == &dev_attr_priv_sess_state.attr)
2270 return S_IRUGO;
2271 else {
2272 WARN_ONCE(1, "Invalid session attr");
2273 return 0;
2274 }
2275
2276 return t->attr_is_visible(ISCSI_PARAM, param);
2277}
2278
2279static struct attribute_group iscsi_session_group = {
2280 .attrs = iscsi_session_attrs,
2281 .is_visible = iscsi_session_attr_is_visible,
2282};
2283
1819dc81
MC		 2284/*
2285 * iSCSI host attrs
2286 */
2287#define iscsi_host_attr_show(param) \
2288static ssize_t \
ee959b00
TJ		 2289show_host_param_##param(struct device *dev, \
2290 struct device_attribute *attr, char *buf) \
1819dc81 2291{ \
ee959b00 2292 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2293 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2294 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2295}
2296
2297#define iscsi_host_attr(field, param) \
2298 iscsi_host_attr_show(param) \
2299static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2300 NULL);
2301
d8196ed2 2302iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2303iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2304iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2305iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 2306
1819dc81
MC		 2307#define SETUP_HOST_RD_ATTR(field, param_flag) \
2308do { \
2309 if (tt->host_param_mask & param_flag) { \
ee959b00 2310 priv->host_attrs[count] = &dev_attr_host_##field; \
1819dc81
MC		 2311 count++; \
2312 } \
2313} while (0)
2314
0896b752
AA		 2315static int iscsi_session_match(struct attribute_container *cont,
2316 struct device *dev)
1da177e4 2317{
7b8631b5 2318 struct iscsi_cls_session *session;
1da177e4 2319 struct Scsi_Host *shost;
0896b752
AA		 2320 struct iscsi_internal *priv;
2321
2322 if (!iscsi_is_session_dev(dev))
2323 return 0;
1da177e4 2324
7b8631b5
MC		 2325 session = iscsi_dev_to_session(dev);
2326 shost = iscsi_session_to_shost(session);
0896b752 2327 if (!shost->transportt)
1da177e4
LT		 2328 return 0;
2329
0896b752
AA		 2330 priv = to_iscsi_internal(shost->transportt);
2331 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2332 return 0;
2333
0896b752 2334 return &priv->session_cont.ac == cont;
1da177e4
LT		 2335}
2336
0896b752
AA		 2337static int iscsi_conn_match(struct attribute_container *cont,
2338 struct device *dev)
2339{
7b8631b5
MC		 2340 struct iscsi_cls_session *session;
2341 struct iscsi_cls_conn *conn;
1da177e4 2342 struct Scsi_Host *shost;
0896b752 2343 struct iscsi_internal *priv;
1da177e4 2344
0896b752 2345 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2346 return 0;
2347
7b8631b5
MC		 2348 conn = iscsi_dev_to_conn(dev);
2349 session = iscsi_dev_to_session(conn->dev.parent);
2350 shost = iscsi_session_to_shost(session);
2351
0896b752 2352 if (!shost->transportt)
1da177e4
LT		 2353 return 0;
2354
0896b752
AA		 2355 priv = to_iscsi_internal(shost->transportt);
2356 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2357 return 0;
1da177e4 2358
0896b752
AA		 2359 return &priv->conn_cont.ac == cont;
2360}
2361
30a6c652
MC		 2362static int iscsi_host_match(struct attribute_container *cont,
2363 struct device *dev)
2364{
2365 struct Scsi_Host *shost;
2366 struct iscsi_internal *priv;
2367
2368 if (!scsi_is_host_device(dev))
2369 return 0;
2370
2371 shost = dev_to_shost(dev);
2372 if (!shost->transportt ||
2373 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2374 return 0;
2375
2376 priv = to_iscsi_internal(shost->transportt);
2377 return &priv->t.host_attrs.ac == cont;
2378}
2379
7b8631b5
MC		 2380struct scsi_transport_template *
2381iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2382{
2383 struct iscsi_internal *priv;
2384 unsigned long flags;
2385 int count = 0, err;
2386
2387 BUG_ON(!tt);
2388
2389 priv = iscsi_if_transport_lookup(tt);
2390 if (priv)
7b8631b5 2391 return NULL;
0896b752 2392
24669f75 2393 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2394 if (!priv)
7b8631b5 2395 return NULL;
0896b752 2396 INIT_LIST_HEAD(&priv->list);
0896b752 2397 priv->iscsi_transport = tt;
30a6c652 2398 priv->t.user_scan = iscsi_user_scan;
06d25af4 2399 priv->t.create_work_queue = 1;
0896b752 2400
ee959b00 2401 priv->dev.class = &iscsi_transport_class;
71610f55 2402 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2403 err = device_register(&priv->dev);
0896b752
AA		 2404 if (err)
2405 goto free_priv;
2406
ee959b00 2407 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2408 if (err)
ee959b00 2409 goto unregister_dev;
0896b752 2410
30a6c652
MC		 2411 /* host parameters */
2412 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2413 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2414 priv->t.host_attrs.ac.match = iscsi_host_match;
32c6e1b9 2415 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2416 transport_container_register(&priv->t.host_attrs);
2417
d8196ed2 2418 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
22236961 2419 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1819dc81 2420 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
8ad5781a 2421 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1819dc81
MC		 2422 BUG_ON(count > ISCSI_HOST_ATTRS);
2423 priv->host_attrs[count] = NULL;
2424 count = 0;
2425
0896b752 2426 /* connection parameters */
0896b752
AA		 2427 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2428 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2429 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2430 transport_container_register(&priv->conn_cont);
1da177e4 2431
0896b752 2432 /* session parameters */
0896b752
AA		 2433 priv->session_cont.ac.class = &iscsi_session_class.class;
2434 priv->session_cont.ac.match = iscsi_session_match;
1d063c17 2435 priv->session_cont.ac.grp = &iscsi_session_group;
0896b752
AA		 2436 transport_container_register(&priv->session_cont);
2437
0896b752
AA		 2438 spin_lock_irqsave(&iscsi_transport_lock, flags);
2439 list_add(&priv->list, &iscsi_transports);
2440 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2441
2442 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2443 return &priv->t;
1da177e4 2444
ee959b00
TJ		 2445unregister_dev:
2446 device_unregister(&priv->dev);
d82ff9be 2447 return NULL;
0896b752
AA		 2448free_priv:
2449 kfree(priv);
7b8631b5 2450 return NULL;
1da177e4 2451}
0896b752
AA		 2452EXPORT_SYMBOL_GPL(iscsi_register_transport);
2453
2454int iscsi_unregister_transport(struct iscsi_transport *tt)
2455{
2456 struct iscsi_internal *priv;
2457 unsigned long flags;
2458
2459 BUG_ON(!tt);
2460
0b950672 2461 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2462
2463 priv = iscsi_if_transport_lookup(tt);
2464 BUG_ON (!priv);
2465
0896b752
AA		 2466 spin_lock_irqsave(&iscsi_transport_lock, flags);
2467 list_del(&priv->list);
2468 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2469
2470 transport_container_unregister(&priv->conn_cont);
2471 transport_container_unregister(&priv->session_cont);
30a6c652 2472 transport_container_unregister(&priv->t.host_attrs);
0896b752 2473
ee959b00
TJ		 2474 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2475 device_unregister(&priv->dev);
0b950672 2476 mutex_unlock(&rx_queue_mutex);
1da177e4 2477
0896b752
AA		 2478 return 0;
2479}
2480EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2481
1da177e4
LT		 2482static __init int iscsi_transport_init(void)
2483{
0896b752 2484 int err;
1da177e4 2485
09492605 2486 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2487 ISCSI_TRANSPORT_VERSION);
2488
41be1444
MC		 2489 atomic_set(&iscsi_session_nr, 0);
2490
0896b752 2491 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2492 if (err)
2493 return err;
0896b752 2494
d82ff9be 2495 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2496 if (err)
2497 goto unregister_transport_class;
2498
8d07913d 2499 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2500 if (err)
2501 goto unregister_endpoint_class;
2502
8d07913d
MC		 2503 err = transport_class_register(&iscsi_host_class);
2504 if (err)
2505 goto unregister_iface_class;
2506
30a6c652
MC		 2507 err = transport_class_register(&iscsi_connection_class);
2508 if (err)
2509 goto unregister_host_class;
2510
0896b752
AA		 2511 err = transport_class_register(&iscsi_session_class);
2512 if (err)
2513 goto unregister_conn_class;
2514
d82ff9be
MC		 2515 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2516 NULL, THIS_MODULE);
0896b752
AA		 2517 if (!nls) {
2518 err = -ENOBUFS;
43a145a3 2519 goto unregister_session_class;
0896b752
AA		 2520 }
2521
d8bf541e
MC		 2522 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2523 if (!iscsi_eh_timer_workq)
2524 goto release_nls;
2525
43a145a3 2526 return 0;
0896b752 2527
d8bf541e 2528release_nls:
b7c6ba6e 2529 netlink_kernel_release(nls);
0896b752
AA		 2530unregister_session_class:
2531 transport_class_unregister(&iscsi_session_class);
2532unregister_conn_class:
2533 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2534unregister_host_class:
2535 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2536unregister_iface_class:
2537 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2538unregister_endpoint_class:
2539 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2540unregister_transport_class:
2541 class_unregister(&iscsi_transport_class);
2542 return err;
1da177e4
LT		 2543}
2544
2545static void __exit iscsi_transport_exit(void)
2546{
d8bf541e 2547 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2548 netlink_kernel_release(nls);
0896b752
AA		 2549 transport_class_unregister(&iscsi_connection_class);
2550 transport_class_unregister(&iscsi_session_class);
30a6c652 2551 transport_class_unregister(&iscsi_host_class);
d82ff9be 2552 class_unregister(&iscsi_endpoint_class);
8d07913d 2553 class_unregister(&iscsi_iface_class);
0896b752 2554 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2555}
2556
2557module_init(iscsi_transport_init);
2558module_exit(iscsi_transport_exit);
2559
0896b752
AA		 2560MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2561 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2562 "Alex Aizman <itn780@yahoo.com>");
2563MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2564MODULE_LICENSE("GPL");
f4246b33 2565MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 2566MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
Linux kernel - Deliverables
This page took 0.766404 seconds and 5 git commands to generate.