projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[SCSI] iscsi class: remove iface param mask
[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;
b78dbba0 332 int param;
8d07913d
MC		 333
334 if (attr == &dev_attr_iface_enabled.attr)
b78dbba0 335 param = ISCSI_NET_PARAM_IFACE_ENABLE;
8d07913d 336 else if (attr == &dev_attr_iface_vlan.attr)
b78dbba0
MC		 337 param = ISCSI_NET_PARAM_VLAN_ID;
338 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
8d07913d 339 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
b78dbba0 340 param = ISCSI_NET_PARAM_IPV4_ADDR;
8d07913d 341 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
b78dbba0 342 param = ISCSI_NET_PARAM_IPV4_GW;
8d07913d 343 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
b78dbba0 344 param = ISCSI_NET_PARAM_IPV4_SUBNET;
8d07913d 345 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
b78dbba0
MC		 346 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
347 else
348 return 0;
8d07913d
MC		 349 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
350 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
b78dbba0 351 param = ISCSI_NET_PARAM_IPV6_ADDR;
8d07913d 352 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
b78dbba0 353 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
8d07913d 354 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
b78dbba0 355 param = ISCSI_NET_PARAM_IPV6_ROUTER;
8d07913d 356 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
b78dbba0 357 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
8d07913d 358 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
b78dbba0
MC		 359 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
360 else
361 return 0;
362 } else {
363 WARN_ONCE(1, "Invalid iface attr");
364 return 0;
8d07913d
MC		 365 }
366
b78dbba0 367 return t->attr_is_visible(ISCSI_NET_PARAM, param);
8d07913d
MC		 368}
369
370static struct attribute *iscsi_iface_attrs[] = {
371 &dev_attr_iface_enabled.attr,
372 &dev_attr_iface_vlan.attr,
373 &dev_attr_ipv4_iface_ipaddress.attr,
374 &dev_attr_ipv4_iface_gateway.attr,
375 &dev_attr_ipv4_iface_subnet.attr,
376 &dev_attr_ipv4_iface_bootproto.attr,
377 &dev_attr_ipv6_iface_ipaddress.attr,
378 &dev_attr_ipv6_iface_link_local_addr.attr,
379 &dev_attr_ipv6_iface_router_addr.attr,
380 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
381 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
382 NULL,
383};
384
385static struct attribute_group iscsi_iface_group = {
386 .attrs = iscsi_iface_attrs,
387 .is_visible = iscsi_iface_attr_is_visible,
388};
389
390struct iscsi_iface *
391iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
392 uint32_t iface_type, uint32_t iface_num, int dd_size)
393{
394 struct iscsi_iface *iface;
395 int err;
396
397 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
398 if (!iface)
399 return NULL;
400
401 iface->transport = transport;
402 iface->iface_type = iface_type;
403 iface->iface_num = iface_num;
404 iface->dev.release = iscsi_iface_release;
405 iface->dev.class = &iscsi_iface_class;
406 /* parent reference released in iscsi_iface_release */
407 iface->dev.parent = get_device(&shost->shost_gendev);
408 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
409 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
410 iface_num);
411 else
412 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
413 iface_num);
414
415 err = device_register(&iface->dev);
416 if (err)
417 goto free_iface;
418
419 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
420 if (err)
421 goto unreg_iface;
422
423 if (dd_size)
424 iface->dd_data = &iface[1];
425 return iface;
426
427unreg_iface:
428 device_unregister(&iface->dev);
429 return NULL;
430
431free_iface:
432 put_device(iface->dev.parent);
433 kfree(iface);
434 return NULL;
435}
436EXPORT_SYMBOL_GPL(iscsi_create_iface);
437
438void iscsi_destroy_iface(struct iscsi_iface *iface)
439{
440 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
441 device_unregister(&iface->dev);
442}
443EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
444
30a6c652 445static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 446 struct device *cdev)
30a6c652
MC		 447{
448 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 449 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 450
451 memset(ihost, 0, sizeof(*ihost));
8aae18ad 452 atomic_set(&ihost->nr_scans, 0);
7970634b 453 mutex_init(&ihost->mutex);
30a6c652
MC		 454 return 0;
455}
456
457static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
458 "iscsi_host",
459 iscsi_setup_host,
06d25af4 460 NULL,
30a6c652
MC		 461 NULL);
462
0896b752
AA		 463static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
464 "iscsi_session",
1da177e4
LT		 465 NULL,
466 NULL,
467 NULL);
468
0896b752
AA		 469static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
470 "iscsi_connection",
1da177e4
LT		 471 NULL,
472 NULL,
473 NULL);
0896b752
AA		 474
475static struct sock *nls;
0b950672 476static DEFINE_MUTEX(rx_queue_mutex);
0896b752 477
7b7232f3
MC		 478static LIST_HEAD(sesslist);
479static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 480static LIST_HEAD(connlist);
481static DEFINE_SPINLOCK(connlock);
0896b752 482
b5c7a12d
MC		 483static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
484{
485 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
486 return sess->sid;
487}
488
489/*
490 * Returns the matching session to a given sid
491 */
492static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 493{
494 unsigned long flags;
495 struct iscsi_cls_session *sess;
496
497 spin_lock_irqsave(&sesslock, flags);
498 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 499 if (sess->sid == sid) {
7b7232f3
MC		 500 spin_unlock_irqrestore(&sesslock, flags);
501 return sess;
502 }
503 }
504 spin_unlock_irqrestore(&sesslock, flags);
505 return NULL;
506}
507
b5c7a12d
MC		 508/*
509 * Returns the matching connection to a given sid / cid tuple
510 */
511static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 512{
513 unsigned long flags;
514 struct iscsi_cls_conn *conn;
515
516 spin_lock_irqsave(&connlock, flags);
517 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 518 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 519 spin_unlock_irqrestore(&connlock, flags);
520 return conn;
521 }
522 }
523 spin_unlock_irqrestore(&connlock, flags);
524 return NULL;
525}
526
7b8631b5
MC		 527/*
528 * The following functions can be used by LLDs that allocate
529 * their own scsi_hosts or by software iscsi LLDs
530 */
6eabafbe
MC		 531static struct {
532 int value;
533 char *name;
534} iscsi_session_state_names[] = {
535 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
536 { ISCSI_SESSION_FAILED, "FAILED" },
537 { ISCSI_SESSION_FREE, "FREE" },
538};
539
3b0f208a 540static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 541{
542 int i;
543 char *name = NULL;
544
545 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
546 if (iscsi_session_state_names[i].value == state) {
547 name = iscsi_session_state_names[i].name;
548 break;
549 }
550 }
551 return name;
552}
553
554int iscsi_session_chkready(struct iscsi_cls_session *session)
555{
556 unsigned long flags;
557 int err;
558
559 spin_lock_irqsave(&session->lock, flags);
560 switch (session->state) {
561 case ISCSI_SESSION_LOGGED_IN:
562 err = 0;
563 break;
564 case ISCSI_SESSION_FAILED:
9a1a69a1 565 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 566 break;
567 case ISCSI_SESSION_FREE:
56d7fcfa 568 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 569 break;
570 default:
571 err = DID_NO_CONNECT << 16;
572 break;
573 }
574 spin_unlock_irqrestore(&session->lock, flags);
575 return err;
576}
577EXPORT_SYMBOL_GPL(iscsi_session_chkready);
578
7b8631b5
MC		 579static void iscsi_session_release(struct device *dev)
580{
581 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 582 struct Scsi_Host *shost;
0896b752 583
7b8631b5
MC		 584 shost = iscsi_session_to_shost(session);
585 scsi_host_put(shost);
632248aa 586 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
7b8631b5 587 kfree(session);
7b8631b5 588}
0896b752 589
7b8631b5
MC		 590static int iscsi_is_session_dev(const struct device *dev)
591{
592 return dev->release == iscsi_session_release;
593}
0896b752 594
a4804cd6
MC		 595static int iscsi_iter_session_fn(struct device *dev, void *data)
596{
597 void (* fn) (struct iscsi_cls_session *) = data;
598
599 if (!iscsi_is_session_dev(dev))
600 return 0;
601 fn(iscsi_dev_to_session(dev));
602 return 0;
603}
604
605void iscsi_host_for_each_session(struct Scsi_Host *shost,
606 void (*fn)(struct iscsi_cls_session *))
607{
608 device_for_each_child(&shost->shost_gendev, fn,
609 iscsi_iter_session_fn);
610}
611EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
612
8aae18ad
MC		 613/**
614 * iscsi_scan_finished - helper to report when running scans are done
615 * @shost: scsi host
616 * @time: scan run time
617 *
618 * This function can be used by drives like qla4xxx to report to the scsi
619 * layer when the scans it kicked off at module load time are done.
620 */
621int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
622{
32c6e1b9 623 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 624 /*
625 * qla4xxx will have kicked off some session unblocks before calling
626 * scsi_scan_host, so just wait for them to complete.
627 */
628 return !atomic_read(&ihost->nr_scans);
629}
630EXPORT_SYMBOL_GPL(iscsi_scan_finished);
631
7970634b
MC		 632struct iscsi_scan_data {
633 unsigned int channel;
634 unsigned int id;
635 unsigned int lun;
636};
637
638static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 639{
7970634b 640 struct iscsi_scan_data *scan_data = data;
30a6c652 641 struct iscsi_cls_session *session;
7970634b
MC		 642 struct Scsi_Host *shost;
643 struct iscsi_cls_host *ihost;
644 unsigned long flags;
645 unsigned int id;
646
647 if (!iscsi_is_session_dev(dev))
648 return 0;
649
650 session = iscsi_dev_to_session(dev);
632248aa
MC		 651
652 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
653
7970634b
MC		 654 shost = iscsi_session_to_shost(session);
655 ihost = shost->shost_data;
30a6c652
MC		 656
657 mutex_lock(&ihost->mutex);
7970634b
MC		 658 spin_lock_irqsave(&session->lock, flags);
659 if (session->state != ISCSI_SESSION_LOGGED_IN) {
660 spin_unlock_irqrestore(&session->lock, flags);
632248aa 661 goto user_scan_exit;
30a6c652 662 }
7970634b
MC		 663 id = session->target_id;
664 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 665
7970634b
MC		 666 if (id != ISCSI_MAX_TARGET) {
667 if ((scan_data->channel == SCAN_WILD_CARD ||
668 scan_data->channel == 0) &&
669 (scan_data->id == SCAN_WILD_CARD ||
670 scan_data->id == id))
671 scsi_scan_target(&session->dev, 0, id,
672 scan_data->lun, 1);
673 }
632248aa
MC		 674
675user_scan_exit:
7970634b 676 mutex_unlock(&ihost->mutex);
632248aa 677 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 678 return 0;
679}
680
7970634b
MC		 681static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
682 uint id, uint lun)
683{
684 struct iscsi_scan_data scan_data;
685
686 scan_data.channel = channel;
687 scan_data.id = id;
688 scan_data.lun = lun;
689
690 return device_for_each_child(&shost->shost_gendev, &scan_data,
691 iscsi_user_scan_session);
692}
693
bd976f62
MC		 694static void iscsi_scan_session(struct work_struct *work)
695{
696 struct iscsi_cls_session *session =
697 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 698 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 699 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 700 struct iscsi_scan_data scan_data;
bd976f62 701
7970634b
MC		 702 scan_data.channel = 0;
703 scan_data.id = SCAN_WILD_CARD;
704 scan_data.lun = SCAN_WILD_CARD;
bd976f62 705
7970634b 706 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 707 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 708}
709
c01be6dc
MC		 710/**
711 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 712 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 713 *
714 * If the session is down this function will wait for the recovery
715 * timer to fire or for the session to be logged back in. If the
716 * recovery timer fires then FAST_IO_FAIL is returned. The caller
717 * should pass this error value to the scsi eh.
718 */
719int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
720{
721 struct iscsi_cls_session *session =
722 starget_to_session(scsi_target(cmd->device));
723 unsigned long flags;
724 int ret = 0;
725
726 spin_lock_irqsave(&session->lock, flags);
727 while (session->state != ISCSI_SESSION_LOGGED_IN) {
728 if (session->state == ISCSI_SESSION_FREE) {
729 ret = FAST_IO_FAIL;
730 break;
731 }
732 spin_unlock_irqrestore(&session->lock, flags);
733 msleep(1000);
734 spin_lock_irqsave(&session->lock, flags);
735 }
736 spin_unlock_irqrestore(&session->lock, flags);
737 return ret;
738}
739EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
740
c4028958 741static void session_recovery_timedout(struct work_struct *work)
30a6c652 742{
c4028958
DH		 743 struct iscsi_cls_session *session =
744 container_of(work, struct iscsi_cls_session,
745 recovery_work.work);
6eabafbe 746 unsigned long flags;
30a6c652 747
322d739d
MC		 748 iscsi_cls_session_printk(KERN_INFO, session,
749 "session recovery timed out after %d secs\n",
750 session->recovery_tmo);
30a6c652 751
6eabafbe
MC		 752 spin_lock_irqsave(&session->lock, flags);
753 switch (session->state) {
754 case ISCSI_SESSION_FAILED:
755 session->state = ISCSI_SESSION_FREE;
756 break;
757 case ISCSI_SESSION_LOGGED_IN:
758 case ISCSI_SESSION_FREE:
759 /* we raced with the unblock's flush */
760 spin_unlock_irqrestore(&session->lock, flags);
761 return;
762 }
763 spin_unlock_irqrestore(&session->lock, flags);
764
30a6c652
MC		 765 if (session->transport->session_recovery_timedout)
766 session->transport->session_recovery_timedout(session);
767
632248aa 768 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
30a6c652 769 scsi_target_unblock(&session->dev);
632248aa 770 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 771}
772
45ab33b6 773static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 774{
45ab33b6
MC		 775 struct iscsi_cls_session *session =
776 container_of(work, struct iscsi_cls_session,
777 unblock_work);
bd976f62 778 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 779 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 780 unsigned long flags;
781
632248aa 782 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 783 /*
784 * The recovery and unblock work get run from the same workqueue,
785 * so try to cancel it if it was going to run after this unblock.
786 */
787 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 788 spin_lock_irqsave(&session->lock, flags);
789 session->state = ISCSI_SESSION_LOGGED_IN;
790 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 791 /* start IO */
792 scsi_target_unblock(&session->dev);
8aae18ad
MC		 793 /*
794 * Only do kernel scanning if the driver is properly hooked into
795 * the async scanning code (drivers like iscsi_tcp do login and
796 * scanning from userspace).
797 */
798 if (shost->hostt->scan_finished) {
06d25af4 799 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 800 atomic_inc(&ihost->nr_scans);
801 }
632248aa 802 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 803}
45ab33b6
MC		 804
805/**
806 * iscsi_unblock_session - set a session as logged in and start IO.
807 * @session: iscsi session
808 *
809 * Mark a session as ready to accept IO.
810 */
811void iscsi_unblock_session(struct iscsi_cls_session *session)
812{
813 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
814 /*
815 * make sure all the events have completed before tell the driver
816 * it is safe
817 */
818 flush_workqueue(iscsi_eh_timer_workq);
819}
30a6c652
MC		 820EXPORT_SYMBOL_GPL(iscsi_unblock_session);
821
45ab33b6 822static void __iscsi_block_session(struct work_struct *work)
30a6c652 823{
45ab33b6
MC		 824 struct iscsi_cls_session *session =
825 container_of(work, struct iscsi_cls_session,
826 block_work);
6eabafbe
MC		 827 unsigned long flags;
828
632248aa 829 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 830 spin_lock_irqsave(&session->lock, flags);
831 session->state = ISCSI_SESSION_FAILED;
832 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 833 scsi_target_block(&session->dev);
632248aa 834 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 835 if (session->recovery_tmo >= 0)
836 queue_delayed_work(iscsi_eh_timer_workq,
837 &session->recovery_work,
838 session->recovery_tmo * HZ);
30a6c652 839}
45ab33b6
MC		 840
841void iscsi_block_session(struct iscsi_cls_session *session)
842{
843 queue_work(iscsi_eh_timer_workq, &session->block_work);
844}
30a6c652
MC		 845EXPORT_SYMBOL_GPL(iscsi_block_session);
846
26974789
MC		 847static void __iscsi_unbind_session(struct work_struct *work)
848{
849 struct iscsi_cls_session *session =
850 container_of(work, struct iscsi_cls_session,
851 unbind_work);
852 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 853 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 854 unsigned long flags;
26974789 855
632248aa
MC		 856 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
857
26974789
MC		 858 /* Prevent new scans and make sure scanning is not in progress */
859 mutex_lock(&ihost->mutex);
7970634b
MC		 860 spin_lock_irqsave(&session->lock, flags);
861 if (session->target_id == ISCSI_MAX_TARGET) {
862 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 863 mutex_unlock(&ihost->mutex);
864 return;
865 }
7970634b
MC		 866 session->target_id = ISCSI_MAX_TARGET;
867 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 868 mutex_unlock(&ihost->mutex);
869
870 scsi_remove_target(&session->dev);
871 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 872 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 873}
874
7b8631b5 875struct iscsi_cls_session *
5d91e209
MC		 876iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
877 int dd_size)
7b8631b5
MC		 878{
879 struct iscsi_cls_session *session;
7b8631b5 880
5d91e209 881 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 882 GFP_KERNEL);
7b8631b5 883 if (!session)
f53a88da
MC		 884 return NULL;
885
7b8631b5 886 session->transport = transport;
30a6c652 887 session->recovery_tmo = 120;
6eabafbe 888 session->state = ISCSI_SESSION_FREE;
c4028958 889 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 890 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 891 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
892 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 893 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 894 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 895 spin_lock_init(&session->lock);
7b8631b5 896
6a8a0d36
MC		 897 /* this is released in the dev's release function */
898 scsi_host_get(shost);
8434aa8b
MC		 899 session->dev.parent = &shost->shost_gendev;
900 session->dev.release = iscsi_session_release;
901 device_initialize(&session->dev);
5d91e209 902 if (dd_size)
b5c7a12d 903 session->dd_data = &session[1];
632248aa
MC		 904
905 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 906 return session;
907}
908EXPORT_SYMBOL_GPL(iscsi_alloc_session);
909
7970634b
MC		 910static int iscsi_get_next_target_id(struct device *dev, void *data)
911{
912 struct iscsi_cls_session *session;
913 unsigned long flags;
914 int err = 0;
915
916 if (!iscsi_is_session_dev(dev))
917 return 0;
918
919 session = iscsi_dev_to_session(dev);
920 spin_lock_irqsave(&session->lock, flags);
921 if (*((unsigned int *) data) == session->target_id)
922 err = -EEXIST;
923 spin_unlock_irqrestore(&session->lock, flags);
924 return err;
925}
926
6a8a0d36 927int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 928{
929 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 930 struct iscsi_cls_host *ihost;
26974789 931 unsigned long flags;
7970634b 932 unsigned int id = target_id;
8434aa8b 933 int err;
b5c7a12d 934
30a6c652 935 ihost = shost->shost_data;
41be1444 936 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 937
938 if (id == ISCSI_MAX_TARGET) {
939 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
940 err = device_for_each_child(&shost->shost_gendev, &id,
941 iscsi_get_next_target_id);
942 if (!err)
943 break;
944 }
945
946 if (id == ISCSI_MAX_TARGET) {
947 iscsi_cls_session_printk(KERN_ERR, session,
948 "Too many iscsi targets. Max "
949 "number of targets is %d.\n",
950 ISCSI_MAX_TARGET - 1);
24add1c4 951 err = -EOVERFLOW;
7970634b
MC		 952 goto release_host;
953 }
954 }
955 session->target_id = id;
30a6c652 956
71610f55 957 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 958 err = device_add(&session->dev);
7b8631b5 959 if (err) {
322d739d
MC		 960 iscsi_cls_session_printk(KERN_ERR, session,
961 "could not register session's dev\n");
8434aa8b 962 goto release_host;
7b8631b5
MC		 963 }
964 transport_register_device(&session->dev);
965
26974789
MC		 966 spin_lock_irqsave(&sesslock, flags);
967 list_add(&session->sess_list, &sesslist);
968 spin_unlock_irqrestore(&sesslock, flags);
969
26974789 970 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 971 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 972 return 0;
30a6c652 973
8434aa8b
MC		 974release_host:
975 scsi_host_put(shost);
976 return err;
7b8631b5 977}
8434aa8b 978EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 979
980/**
8434aa8b
MC		 981 * iscsi_create_session - create iscsi class session
982 * @shost: scsi host
983 * @transport: iscsi transport
5d91e209 984 * @dd_size: private driver data size
eb44820c 985 * @target_id: which target
7b8631b5 986 *
8434aa8b 987 * This can be called from a LLD or iscsi_transport.
eb44820c 988 */
8434aa8b 989struct iscsi_cls_session *
5d91e209
MC		 990iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
991 int dd_size, unsigned int target_id)
8434aa8b
MC		 992{
993 struct iscsi_cls_session *session;
994
5d91e209 995 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 996 if (!session)
997 return NULL;
998
6a8a0d36 999 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1000 iscsi_free_session(session);
1001 return NULL;
1002 }
1003 return session;
1004}
1005EXPORT_SYMBOL_GPL(iscsi_create_session);
1006
26974789
MC		 1007static void iscsi_conn_release(struct device *dev)
1008{
1009 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1010 struct device *parent = conn->dev.parent;
1011
632248aa 1012 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1013 kfree(conn);
1014 put_device(parent);
1015}
1016
1017static int iscsi_is_conn_dev(const struct device *dev)
1018{
1019 return dev->release == iscsi_conn_release;
1020}
1021
1022static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1023{
1024 if (!iscsi_is_conn_dev(dev))
1025 return 0;
1026 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1027}
1028
8434aa8b 1029void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1030{
30a6c652 1031 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1032 unsigned long flags;
1033 int err;
1034
632248aa
MC		 1035 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1036
26974789
MC		 1037 spin_lock_irqsave(&sesslock, flags);
1038 list_del(&session->sess_list);
1039 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1040
45ab33b6
MC		 1041 /* make sure there are no blocks/unblocks queued */
1042 flush_workqueue(iscsi_eh_timer_workq);
1043 /* make sure the timedout callout is not running */
1044 if (!cancel_delayed_work(&session->recovery_work))
1045 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1046 /*
1047 * If we are blocked let commands flow again. The lld or iscsi
1048 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1049 * We assume that LLD will not be calling block/unblock while
1050 * removing the session.
26974789 1051 */
6eabafbe
MC		 1052 spin_lock_irqsave(&session->lock, flags);
1053 session->state = ISCSI_SESSION_FREE;
1054 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1055
45ab33b6
MC		 1056 scsi_target_unblock(&session->dev);
1057 /* flush running scans then delete devices */
06d25af4 1058 scsi_flush_work(shost);
45ab33b6 1059 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1060
26974789
MC		 1061 /* hw iscsi may not have removed all connections from session */
1062 err = device_for_each_child(&session->dev, NULL,
1063 iscsi_iter_destroy_conn_fn);
1064 if (err)
322d739d
MC		 1065 iscsi_cls_session_printk(KERN_ERR, session,
1066 "Could not delete all connections "
1067 "for session. Error %d.\n", err);
8434aa8b 1068
7b8631b5 1069 transport_unregister_device(&session->dev);
632248aa
MC		 1070
1071 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1072 device_del(&session->dev);
1073}
1074EXPORT_SYMBOL_GPL(iscsi_remove_session);
1075
1076void iscsi_free_session(struct iscsi_cls_session *session)
1077{
632248aa 1078 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1079 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1080 put_device(&session->dev);
7b8631b5 1081}
8434aa8b
MC		 1082EXPORT_SYMBOL_GPL(iscsi_free_session);
1083
1084/**
1085 * iscsi_destroy_session - destroy iscsi session
1086 * @session: iscsi_session
1087 *
1088 * Can be called by a LLD or iscsi_transport. There must not be
1089 * any running connections.
eb44820c 1090 */
8434aa8b
MC		 1091int iscsi_destroy_session(struct iscsi_cls_session *session)
1092{
1093 iscsi_remove_session(session);
632248aa 1094 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1095 iscsi_free_session(session);
1096 return 0;
1097}
7b8631b5
MC		 1098EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1099
7b8631b5
MC		 1100/**
1101 * iscsi_create_conn - create iscsi class connection
1102 * @session: iscsi cls session
5d91e209 1103 * @dd_size: private driver data size
7b8631b5
MC		 1104 * @cid: connection id
1105 *
1106 * This can be called from a LLD or iscsi_transport. The connection
1107 * is child of the session so cid must be unique for all connections
1108 * on the session.
b5c7a12d
MC		 1109 *
1110 * Since we do not support MCS, cid will normally be zero. In some cases
1111 * for software iscsi we could be trying to preallocate a connection struct
1112 * in which case there could be two connection structs and cid would be
1113 * non-zero.
eb44820c 1114 */
7b8631b5 1115struct iscsi_cls_conn *
5d91e209 1116iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1117{
1118 struct iscsi_transport *transport = session->transport;
7b8631b5 1119 struct iscsi_cls_conn *conn;
26974789 1120 unsigned long flags;
7b8631b5
MC		 1121 int err;
1122
5d91e209 1123 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1124 if (!conn)
1125 return NULL;
5d91e209 1126 if (dd_size)
7b8631b5
MC		 1127 conn->dd_data = &conn[1];
1128
22a39fbb 1129 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1130 INIT_LIST_HEAD(&conn->conn_list);
1131 conn->transport = transport;
b5c7a12d 1132 conn->cid = cid;
7b8631b5
MC		 1133
1134 /* this is released in the dev's release function */
1135 if (!get_device(&session->dev))
43a145a3 1136 goto free_conn;
b5c7a12d 1137
71610f55 1138 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1139 conn->dev.parent = &session->dev;
1140 conn->dev.release = iscsi_conn_release;
1141 err = device_register(&conn->dev);
1142 if (err) {
322d739d
MC		 1143 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1144 "register connection's dev\n");
7b8631b5
MC		 1145 goto release_parent_ref;
1146 }
1147 transport_register_device(&conn->dev);
26974789
MC		 1148
1149 spin_lock_irqsave(&connlock, flags);
1150 list_add(&conn->conn_list, &connlist);
26974789 1151 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1152
1153 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1154 return conn;
1155
1156release_parent_ref:
1157 put_device(&session->dev);
1158free_conn:
1159 kfree(conn);
1160 return NULL;
1161}
1162
1163EXPORT_SYMBOL_GPL(iscsi_create_conn);
1164
1165/**
1166 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1167 * @conn: iscsi cls session
7b8631b5 1168 *
26974789 1169 * This can be called from a LLD or iscsi_transport.
eb44820c 1170 */
7b8631b5
MC		 1171int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1172{
26974789
MC		 1173 unsigned long flags;
1174
1175 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1176 list_del(&conn->conn_list);
1177 spin_unlock_irqrestore(&connlock, flags);
1178
7b8631b5 1179 transport_unregister_device(&conn->dev);
632248aa 1180 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1181 device_unregister(&conn->dev);
1182 return 0;
1183}
7b8631b5
MC		 1184EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1185
7b8631b5
MC		 1186/*
1187 * iscsi interface functions
1188 */
0896b752
AA		 1189static struct iscsi_internal *
1190iscsi_if_transport_lookup(struct iscsi_transport *tt)
1191{
1192 struct iscsi_internal *priv;
1193 unsigned long flags;
1194
1195 spin_lock_irqsave(&iscsi_transport_lock, flags);
1196 list_for_each_entry(priv, &iscsi_transports, list) {
1197 if (tt == priv->iscsi_transport) {
1198 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1199 return priv;
1200 }
1201 }
1202 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1203 return NULL;
1204}
1da177e4 1205
53cb8a1f 1206static int
43514774 1207iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1208{
43514774 1209 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1210}
1da177e4 1211
7b7232f3 1212int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1213 char *data, uint32_t data_size)
1da177e4 1214{
0896b752
AA		 1215 struct nlmsghdr *nlh;
1216 struct sk_buff *skb;
1217 struct iscsi_uevent *ev;
0896b752 1218 char *pdu;
790f39a2 1219 struct iscsi_internal *priv;
0896b752
AA		 1220 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1221 data_size);
1222
790f39a2
MC		 1223 priv = iscsi_if_transport_lookup(conn->transport);
1224 if (!priv)
1225 return -EINVAL;
1226
43a145a3 1227 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1228 if (!skb) {
e5bd7b54 1229 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1230 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1231 "control PDU: OOM\n");
0896b752
AA		 1232 return -ENOMEM;
1233 }
1da177e4 1234
43514774 1235 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1236 ev = NLMSG_DATA(nlh);
1237 memset(ev, 0, sizeof(*ev));
1238 ev->transport_handle = iscsi_handle(conn->transport);
1239 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1240 ev->r.recv_req.cid = conn->cid;
1241 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1242 pdu = (char*)ev + sizeof(*ev);
1243 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1244 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1245
43514774 1246 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1247}
0896b752 1248EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1249
43514774
MC		 1250int iscsi_offload_mesg(struct Scsi_Host *shost,
1251 struct iscsi_transport *transport, uint32_t type,
1252 char *data, uint16_t data_size)
1253{
1254 struct nlmsghdr *nlh;
1255 struct sk_buff *skb;
1256 struct iscsi_uevent *ev;
1257 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1258
a541f840 1259 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1260 if (!skb) {
1261 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1262 return -ENOMEM;
1263 }
1264
1265 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1266 ev = NLMSG_DATA(nlh);
1267 memset(ev, 0, sizeof(*ev));
1268 ev->type = type;
1269 ev->transport_handle = iscsi_handle(transport);
1270 switch (type) {
1271 case ISCSI_KEVENT_PATH_REQ:
1272 ev->r.req_path.host_no = shost->host_no;
1273 break;
1274 case ISCSI_KEVENT_IF_DOWN:
1275 ev->r.notify_if_down.host_no = shost->host_no;
1276 break;
1277 }
1278
1279 memcpy((char *)ev + sizeof(*ev), data, data_size);
1280
a541f840 1281 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1282}
1283EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1284
e5bd7b54 1285void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1286{
0896b752
AA		 1287 struct nlmsghdr *nlh;
1288 struct sk_buff *skb;
1289 struct iscsi_uevent *ev;
790f39a2 1290 struct iscsi_internal *priv;
0896b752
AA		 1291 int len = NLMSG_SPACE(sizeof(*ev));
1292
790f39a2
MC		 1293 priv = iscsi_if_transport_lookup(conn->transport);
1294 if (!priv)
1295 return;
1296
43a145a3 1297 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1298 if (!skb) {
322d739d
MC		 1299 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1300 "conn error (%d)\n", error);
0896b752
AA		 1301 return;
1302 }
1303
43514774 1304 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1305 ev = NLMSG_DATA(nlh);
1306 ev->transport_handle = iscsi_handle(conn->transport);
1307 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1308 ev->r.connerror.error = error;
b5c7a12d
MC		 1309 ev->r.connerror.cid = conn->cid;
1310 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1311
43514774 1312 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1313
322d739d
MC		 1314 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1315 error);
0896b752 1316}
e5bd7b54 1317EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752
AA		 1318
1319static int
43514774
MC		 1320iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1321 void *payload, int size)
0896b752
AA		 1322{
1323 struct sk_buff *skb;
1324 struct nlmsghdr *nlh;
1325 int len = NLMSG_SPACE(size);
1326 int flags = multi ? NLM_F_MULTI : 0;
1327 int t = done ? NLMSG_DONE : type;
1328
43a145a3 1329 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1330 if (!skb) {
1331 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1332 return -ENOMEM;
1333 }
0896b752 1334
43514774 1335 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1336 nlh->nlmsg_flags = flags;
1337 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1338 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1339}
1da177e4 1340
7b8631b5 1341static int
5b940adf 1342iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1343{
1344 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1345 struct iscsi_stats *stats;
1346 struct sk_buff *skbstat;
1347 struct iscsi_cls_conn *conn;
1348 struct nlmsghdr *nlhstat;
1349 struct iscsi_uevent *evstat;
790f39a2 1350 struct iscsi_internal *priv;
7b8631b5
MC		 1351 int len = NLMSG_SPACE(sizeof(*ev) +
1352 sizeof(struct iscsi_stats) +
1353 sizeof(struct iscsi_stats_custom) *
1354 ISCSI_STATS_CUSTOM_MAX);
1355 int err = 0;
0896b752 1356
790f39a2
MC		 1357 priv = iscsi_if_transport_lookup(transport);
1358 if (!priv)
1359 return -EINVAL;
1360
b5c7a12d 1361 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1362 if (!conn)
1363 return -EEXIST;
0896b752 1364
7b8631b5
MC		 1365 do {
1366 int actual_size;
0896b752 1367
43a145a3 1368 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1369 if (!skbstat) {
322d739d
MC		 1370 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1371 "deliver stats: OOM\n");
7b8631b5
MC		 1372 return -ENOMEM;
1373 }
1374
43514774 1375 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1376 (len - sizeof(*nlhstat)), 0);
1377 evstat = NLMSG_DATA(nlhstat);
1378 memset(evstat, 0, sizeof(*evstat));
1379 evstat->transport_handle = iscsi_handle(conn->transport);
1380 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1381 evstat->u.get_stats.cid =
1382 ev->u.get_stats.cid;
1383 evstat->u.get_stats.sid =
1384 ev->u.get_stats.sid;
7b8631b5
MC		 1385 stats = (struct iscsi_stats *)
1386 ((char*)evstat + sizeof(*evstat));
1387 memset(stats, 0, sizeof(*stats));
1388
7b7232f3 1389 transport->get_stats(conn, stats);
7b8631b5
MC		 1390 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1391 sizeof(struct iscsi_stats) +
1392 sizeof(struct iscsi_stats_custom) *
1393 stats->custom_length);
1394 actual_size -= sizeof(*nlhstat);
1395 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1396 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1397 nlhstat->nlmsg_len = actual_size;
1398
43514774
MC		 1399 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1400 GFP_ATOMIC);
7b8631b5
MC		 1401 } while (err < 0 && err != -ECONNREFUSED);
1402
1403 return err;
0896b752
AA		 1404}
1405
53cb8a1f 1406/**
26974789
MC		 1407 * iscsi_session_event - send session destr. completion event
1408 * @session: iscsi class session
1409 * @event: type of event
eb44820c 1410 */
26974789
MC		 1411int iscsi_session_event(struct iscsi_cls_session *session,
1412 enum iscsi_uevent_e event)
53cb8a1f
MC		 1413{
1414 struct iscsi_internal *priv;
53cb8a1f
MC		 1415 struct Scsi_Host *shost;
1416 struct iscsi_uevent *ev;
1417 struct sk_buff *skb;
1418 struct nlmsghdr *nlh;
53cb8a1f
MC		 1419 int rc, len = NLMSG_SPACE(sizeof(*ev));
1420
26974789 1421 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1422 if (!priv)
1423 return -EINVAL;
53cb8a1f
MC		 1424 shost = iscsi_session_to_shost(session);
1425
43a145a3 1426 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1427 if (!skb) {
322d739d
MC		 1428 iscsi_cls_session_printk(KERN_ERR, session,
1429 "Cannot notify userspace of session "
1430 "event %u\n", event);
53cb8a1f
MC		 1431 return -ENOMEM;
1432 }
1433
43514774 1434 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1435 ev = NLMSG_DATA(nlh);
26974789 1436 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1437
26974789
MC		 1438 ev->type = event;
1439 switch (event) {
1440 case ISCSI_KEVENT_DESTROY_SESSION:
1441 ev->r.d_session.host_no = shost->host_no;
1442 ev->r.d_session.sid = session->sid;
1443 break;
1444 case ISCSI_KEVENT_CREATE_SESSION:
1445 ev->r.c_session_ret.host_no = shost->host_no;
1446 ev->r.c_session_ret.sid = session->sid;
1447 break;
1448 case ISCSI_KEVENT_UNBIND_SESSION:
1449 ev->r.unbind_session.host_no = shost->host_no;
1450 ev->r.unbind_session.sid = session->sid;
1451 break;
1452 default:
322d739d
MC		 1453 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1454 "%u.\n", event);
26974789 1455 kfree_skb(skb);
53cb8a1f 1456 return -EINVAL;
53cb8a1f
MC		 1457 }
1458
53cb8a1f
MC		 1459 /*
1460 * this will occur if the daemon is not up, so we just warn
1461 * the user and when the daemon is restarted it will handle it
1462 */
43514774 1463 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1464 if (rc == -ESRCH)
322d739d
MC		 1465 iscsi_cls_session_printk(KERN_ERR, session,
1466 "Cannot notify userspace of session "
1467 "event %u. Check iscsi daemon\n",
1468 event);
632248aa
MC		 1469
1470 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1471 event, rc);
53cb8a1f
MC		 1472 return rc;
1473}
26974789 1474EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1475
0896b752 1476static int
d82ff9be
MC		 1477iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1478 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1479 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1480{
1481 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1482 struct iscsi_cls_session *session;
5e7facb7 1483 struct Scsi_Host *shost;
0896b752 1484
d82ff9be 1485 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1486 initial_cmdsn);
7b7232f3 1487 if (!session)
7b8631b5 1488 return -ENOMEM;
0896b752 1489
5e7facb7
MC		 1490 shost = iscsi_session_to_shost(session);
1491 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1492 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1493 ISCSI_DBG_TRANS_SESSION(session,
1494 "Completed creating transport session\n");
0896b752 1495 return 0;
0896b752
AA		 1496}
1497
1498static int
7b7232f3 1499iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1500{
7b8631b5 1501 struct iscsi_cls_conn *conn;
7b7232f3 1502 struct iscsi_cls_session *session;
7b8631b5 1503
b5c7a12d
MC		 1504 session = iscsi_session_lookup(ev->u.c_conn.sid);
1505 if (!session) {
322d739d 1506 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1507 ev->u.c_conn.sid);
7b8631b5 1508 return -EINVAL;
b5c7a12d 1509 }
0896b752 1510
7b7232f3 1511 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1512 if (!conn) {
322d739d
MC		 1513 iscsi_cls_session_printk(KERN_ERR, session,
1514 "couldn't create a new connection.");
7b7232f3 1515 return -ENOMEM;
b5c7a12d 1516 }
0896b752 1517
b5c7a12d
MC		 1518 ev->r.c_conn_ret.sid = session->sid;
1519 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1520
1521 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1522 return 0;
1da177e4
LT		 1523}
1524
0896b752
AA		 1525static int
1526iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1527{
7b8631b5 1528 struct iscsi_cls_conn *conn;
0896b752 1529
b5c7a12d 1530 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1531 if (!conn)
7b8631b5 1532 return -EINVAL;
0896b752 1533
632248aa 1534 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1535 if (transport->destroy_conn)
1536 transport->destroy_conn(conn);
632248aa 1537
7b8631b5 1538 return 0;
0896b752
AA		 1539}
1540
fd7255f5
MC		 1541static int
1542iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1543{
1544 char *data = (char*)ev + sizeof(*ev);
1545 struct iscsi_cls_conn *conn;
1546 struct iscsi_cls_session *session;
a54a52ca 1547 int err = 0, value = 0;
fd7255f5
MC		 1548
1549 session = iscsi_session_lookup(ev->u.set_param.sid);
1550 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1551 if (!conn || !session)
1552 return -EINVAL;
1553
1554 switch (ev->u.set_param.param) {
30a6c652 1555 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1556 sscanf(data, "%d", &value);
fdd46dcb 1557 session->recovery_tmo = value;
30a6c652 1558 break;
fd7255f5 1559 default:
a54a52ca
MC		 1560 err = transport->set_param(conn, ev->u.set_param.param,
1561 data, ev->u.set_param.len);
fd7255f5
MC		 1562 }
1563
1564 return err;
1565}
1566
10eb0f01
MC		 1567static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1568 struct iscsi_uevent *ev, int msg_type)
1569{
1570 struct iscsi_endpoint *ep;
1571 struct sockaddr *dst_addr;
1572 struct Scsi_Host *shost = NULL;
1573 int non_blocking, err = 0;
1574
1575 if (!transport->ep_connect)
1576 return -EINVAL;
1577
1578 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1579 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1580 if (!shost) {
1581 printk(KERN_ERR "ep connect failed. Could not find "
1582 "host no %u\n",
1583 ev->u.ep_connect_through_host.host_no);
1584 return -ENODEV;
1585 }
1586 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1587 } else
1588 non_blocking = ev->u.ep_connect.non_blocking;
1589
1590 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1591 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1592 if (IS_ERR(ep)) {
1593 err = PTR_ERR(ep);
1594 goto release_host;
1595 }
1596
1597 ev->r.ep_connect_ret.handle = ep->id;
1598release_host:
1599 if (shost)
1600 scsi_host_put(shost);
1601 return err;
1602}
1603
22a39fbb
MC		 1604static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1605 u64 ep_handle)
1606{
1607 struct iscsi_cls_conn *conn;
1608 struct iscsi_endpoint *ep;
1609
1610 if (!transport->ep_disconnect)
1611 return -EINVAL;
1612
1613 ep = iscsi_lookup_endpoint(ep_handle);
1614 if (!ep)
1615 return -EINVAL;
1616 conn = ep->conn;
1617 if (conn) {
1618 mutex_lock(&conn->ep_mutex);
1619 conn->ep = NULL;
1620 mutex_unlock(&conn->ep_mutex);
1621 }
1622
1623 transport->ep_disconnect(ep);
1624 return 0;
1625}
1626
264faaaa
OG		 1627static int
1628iscsi_if_transport_ep(struct iscsi_transport *transport,
1629 struct iscsi_uevent *ev, int msg_type)
1630{
d82ff9be 1631 struct iscsi_endpoint *ep;
264faaaa
OG		 1632 int rc = 0;
1633
1634 switch (msg_type) {
10eb0f01 1635 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1636 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1637 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1638 break;
1639 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1640 if (!transport->ep_poll)
1641 return -EINVAL;
1642
d82ff9be
MC		 1643 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1644 if (!ep)
1645 return -EINVAL;
1646
1647 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1648 ev->u.ep_poll.timeout_ms);
1649 break;
1650 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1651 rc = iscsi_if_ep_disconnect(transport,
1652 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1653 break;
1654 }
1655 return rc;
1656}
1657
01cb225d
MC		 1658static int
1659iscsi_tgt_dscvr(struct iscsi_transport *transport,
1660 struct iscsi_uevent *ev)
1661{
2174a04e 1662 struct Scsi_Host *shost;
01cb225d 1663 struct sockaddr *dst_addr;
2174a04e 1664 int err;
01cb225d
MC		 1665
1666 if (!transport->tgt_dscvr)
1667 return -EINVAL;
1668
2174a04e 1669 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1670 if (!shost) {
2174a04e
MC		 1671 printk(KERN_ERR "target discovery could not find host no %u\n",
1672 ev->u.tgt_dscvr.host_no);
1673 return -ENODEV;
1674 }
1675
1676
01cb225d 1677 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1678 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1679 ev->u.tgt_dscvr.enable, dst_addr);
1680 scsi_host_put(shost);
1681 return err;
01cb225d
MC		 1682}
1683
1d9bf13a
MC		 1684static int
1685iscsi_set_host_param(struct iscsi_transport *transport,
1686 struct iscsi_uevent *ev)
1687{
1688 char *data = (char*)ev + sizeof(*ev);
1689 struct Scsi_Host *shost;
1690 int err;
1691
1692 if (!transport->set_host_param)
1693 return -ENOSYS;
1694
1695 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1696 if (!shost) {
1d9bf13a
MC		 1697 printk(KERN_ERR "set_host_param could not find host no %u\n",
1698 ev->u.set_host_param.host_no);
1699 return -ENODEV;
1700 }
1701
1702 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1703 data, ev->u.set_host_param.len);
1704 scsi_host_put(shost);
1705 return err;
1706}
1707
0896b752 1708static int
43514774
MC		 1709iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1710{
1711 struct Scsi_Host *shost;
1712 struct iscsi_path *params;
1713 int err;
1714
1715 if (!transport->set_path)
1716 return -ENOSYS;
1717
1718 shost = scsi_host_lookup(ev->u.set_path.host_no);
1719 if (!shost) {
1720 printk(KERN_ERR "set path could not find host no %u\n",
1721 ev->u.set_path.host_no);
1722 return -ENODEV;
1723 }
1724
1725 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1726 err = transport->set_path(shost, params);
1727
1728 scsi_host_put(shost);
1729 return err;
1730}
1731
56c155b5
MC		 1732static int
1733iscsi_set_iface_params(struct iscsi_transport *transport,
1734 struct iscsi_uevent *ev)
1735{
1736 char *data = (char *)ev + sizeof(*ev);
1737 struct Scsi_Host *shost;
1738 int err;
1739
1740 if (!transport->set_iface_param)
1741 return -ENOSYS;
1742
1743 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1744 if (!shost) {
1745 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1746 ev->u.set_iface_params.host_no);
1747 return -ENODEV;
1748 }
1749
1750 err = transport->set_iface_param(shost, data,
1751 ev->u.set_iface_params.count);
1752 scsi_host_put(shost);
1753 return err;
1754}
1755
43514774
MC		 1756static int
1757iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 1758{
1759 int err = 0;
1760 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1761 struct iscsi_transport *transport = NULL;
1762 struct iscsi_internal *priv;
7b7232f3
MC		 1763 struct iscsi_cls_session *session;
1764 struct iscsi_cls_conn *conn;
d82ff9be 1765 struct iscsi_endpoint *ep = NULL;
0896b752 1766
43514774
MC		 1767 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1768 *group = ISCSI_NL_GRP_UIP;
1769 else
1770 *group = ISCSI_NL_GRP_ISCSID;
1771
0896b752
AA		 1772 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1773 if (!priv)
1774 return -EINVAL;
1775 transport = priv->iscsi_transport;
1776
7b7232f3
MC		 1777 if (!try_module_get(transport->owner))
1778 return -EINVAL;
1779
0896b752
AA		 1780 switch (nlh->nlmsg_type) {
1781 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1782 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1783 ev->u.c_session.initial_cmdsn,
1784 ev->u.c_session.cmds_max,
1785 ev->u.c_session.queue_depth);
1786 break;
1787 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1788 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1789 if (!ep) {
1790 err = -EINVAL;
1791 break;
1792 }
d82ff9be
MC		 1793
1794 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1795 ev->u.c_bound_session.initial_cmdsn,
1796 ev->u.c_bound_session.cmds_max,
1797 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1798 break;
1799 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1800 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1801 if (session)
7b7232f3 1802 transport->destroy_session(session);
26974789
MC		 1803 else
1804 err = -EINVAL;
1805 break;
1806 case ISCSI_UEVENT_UNBIND_SESSION:
1807 session = iscsi_session_lookup(ev->u.d_session.sid);
1808 if (session)
06d25af4
MC		 1809 scsi_queue_work(iscsi_session_to_shost(session),
1810 &session->unbind_work);
26974789 1811 else
7b7232f3 1812 err = -EINVAL;
0896b752
AA		 1813 break;
1814 case ISCSI_UEVENT_CREATE_CONN:
1815 err = iscsi_if_create_conn(transport, ev);
1816 break;
1817 case ISCSI_UEVENT_DESTROY_CONN:
1818 err = iscsi_if_destroy_conn(transport, ev);
1819 break;
1820 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1821 session = iscsi_session_lookup(ev->u.b_conn.sid);
1822 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 1823
22a39fbb
MC		 1824 if (conn && conn->ep)
1825 iscsi_if_ep_disconnect(transport, conn->ep->id);
1826
1827 if (!session || !conn) {
7b7232f3 1828 err = -EINVAL;
22a39fbb
MC		 1829 break;
1830 }
1831
1832 ev->r.retcode = transport->bind_conn(session, conn,
1833 ev->u.b_conn.transport_eph,
1834 ev->u.b_conn.is_leading);
1835 if (ev->r.retcode || !transport->ep_connect)
1836 break;
1837
1838 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1839 if (ep) {
1840 ep->conn = conn;
1841
1842 mutex_lock(&conn->ep_mutex);
1843 conn->ep = ep;
1844 mutex_unlock(&conn->ep_mutex);
1845 } else
1846 iscsi_cls_conn_printk(KERN_ERR, conn,
1847 "Could not set ep conn "
1848 "binding\n");
0896b752
AA		 1849 break;
1850 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 1851 err = iscsi_set_param(transport, ev);
0896b752
AA		 1852 break;
1853 case ISCSI_UEVENT_START_CONN:
b5c7a12d 1854 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 1855 if (conn)
1856 ev->r.retcode = transport->start_conn(conn);
1857 else
1858 err = -EINVAL;
0896b752
AA		 1859 break;
1860 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 1861 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 1862 if (conn)
1863 transport->stop_conn(conn, ev->u.stop_conn.flag);
1864 else
1865 err = -EINVAL;
0896b752
AA		 1866 break;
1867 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 1868 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 1869 if (conn)
1870 ev->r.retcode = transport->send_pdu(conn,
1871 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1872 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1873 ev->u.send_pdu.data_size);
1874 else
1875 err = -EINVAL;
0896b752
AA		 1876 break;
1877 case ISCSI_UEVENT_GET_STATS:
5b940adf 1878 err = iscsi_if_get_stats(transport, nlh);
0896b752 1879 break;
264faaaa
OG		 1880 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1881 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1882 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 1883 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 1884 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1885 break;
01cb225d
MC		 1886 case ISCSI_UEVENT_TGT_DSCVR:
1887 err = iscsi_tgt_dscvr(transport, ev);
1888 break;
1d9bf13a
MC		 1889 case ISCSI_UEVENT_SET_HOST_PARAM:
1890 err = iscsi_set_host_param(transport, ev);
1891 break;
43514774
MC		 1892 case ISCSI_UEVENT_PATH_UPDATE:
1893 err = iscsi_set_path(transport, ev);
1894 break;
56c155b5
MC		 1895 case ISCSI_UEVENT_SET_IFACE_PARAMS:
1896 err = iscsi_set_iface_params(transport, ev);
1897 break;
0896b752 1898 default:
1d9bf13a 1899 err = -ENOSYS;
0896b752
AA		 1900 break;
1901 }
1902
7b7232f3 1903 module_put(transport->owner);
0896b752
AA		 1904 return err;
1905}
1906
b5c7a12d 1907/*
cd40b7d3
DL		 1908 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1909 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 1910 */
0896b752 1911static void
cd40b7d3 1912iscsi_if_rx(struct sk_buff *skb)
0896b752 1913{
0b950672 1914 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 1915 while (skb->len >= NLMSG_SPACE(0)) {
1916 int err;
1917 uint32_t rlen;
1918 struct nlmsghdr *nlh;
1919 struct iscsi_uevent *ev;
43514774 1920 uint32_t group;
cd40b7d3
DL		 1921
1922 nlh = nlmsg_hdr(skb);
1923 if (nlh->nlmsg_len < sizeof(*nlh) ||
1924 skb->len < nlh->nlmsg_len) {
1925 break;
ee7f8e40 1926 }
ee7f8e40 1927
cd40b7d3
DL		 1928 ev = NLMSG_DATA(nlh);
1929 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1930 if (rlen > skb->len)
1931 rlen = skb->len;
0896b752 1932
43514774 1933 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 1934 if (err) {
1935 ev->type = ISCSI_KEVENT_IF_ERROR;
1936 ev->iferror = err;
0896b752 1937 }
cd40b7d3
DL		 1938 do {
1939 /*
1940 * special case for GET_STATS:
1941 * on success - sending reply and stats from
1942 * inside of if_recv_msg(),
1943 * on error - fall through.
1944 */
1945 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1946 break;
43514774 1947 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3
DL		 1948 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1949 } while (err < 0 && err != -ECONNREFUSED);
1950 skb_pull(skb, rlen);
0896b752 1951 }
0b950672 1952 mutex_unlock(&rx_queue_mutex);
0896b752 1953}
1da177e4 1954
fd7255f5 1955#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 1956struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 1957 __ATTR(_name,_mode,_show,_store)
1958
1da177e4 1959/*
0896b752 1960 * iSCSI connection attrs
1da177e4 1961 */
a54a52ca 1962#define iscsi_conn_attr_show(param) \
0896b752 1963static ssize_t \
ee959b00
TJ		 1964show_conn_param_##param(struct device *dev, \
1965 struct device_attribute *attr, char *buf) \
0896b752 1966{ \
ee959b00 1967 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 1968 struct iscsi_transport *t = conn->transport; \
a54a52ca 1969 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 1970}
1971
a54a52ca
MC		 1972#define iscsi_conn_attr(field, param) \
1973 iscsi_conn_attr_show(param) \
1974static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 1975 NULL);
0896b752 1976
a54a52ca
MC		 1977iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1978iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1979iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1980iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1981iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1982iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1983iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 1984iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1985iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 1986iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1987iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 1988
289324b0
MC		 1989#define iscsi_conn_ep_attr_show(param) \
1990static ssize_t show_conn_ep_param_##param(struct device *dev, \
1991 struct device_attribute *attr,\
1992 char *buf) \
1993{ \
1994 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1995 struct iscsi_transport *t = conn->transport; \
1996 struct iscsi_endpoint *ep; \
1997 ssize_t rc; \
1998 \
1999 /* \
2000 * Need to make sure ep_disconnect does not free the LLD's \
2001 * interconnect resources while we are trying to read them. \
2002 */ \
2003 mutex_lock(&conn->ep_mutex); \
2004 ep = conn->ep; \
2005 if (!ep && t->ep_connect) { \
2006 mutex_unlock(&conn->ep_mutex); \
2007 return -ENOTCONN; \
2008 } \
2009 \
2010 if (ep) \
2011 rc = t->get_ep_param(ep, param, buf); \
2012 else \
2013 rc = t->get_conn_param(conn, param, buf); \
2014 mutex_unlock(&conn->ep_mutex); \
2015 return rc; \
2016}
2017
2018#define iscsi_conn_ep_attr(field, param) \
2019 iscsi_conn_ep_attr_show(param) \
2020static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2021 show_conn_ep_param_##param, NULL);
2022
2023iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2024iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2025
3128c6c7
MC		 2026static struct attribute *iscsi_conn_attrs[] = {
2027 &dev_attr_conn_max_recv_dlength.attr,
2028 &dev_attr_conn_max_xmit_dlength.attr,
2029 &dev_attr_conn_header_digest.attr,
2030 &dev_attr_conn_data_digest.attr,
2031 &dev_attr_conn_ifmarker.attr,
2032 &dev_attr_conn_ofmarker.attr,
2033 &dev_attr_conn_address.attr,
2034 &dev_attr_conn_port.attr,
2035 &dev_attr_conn_exp_statsn.attr,
2036 &dev_attr_conn_persistent_address.attr,
2037 &dev_attr_conn_persistent_port.attr,
2038 &dev_attr_conn_ping_tmo.attr,
2039 &dev_attr_conn_recv_tmo.attr,
2040 NULL,
2041};
2042
2043static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2044 struct attribute *attr, int i)
2045{
2046 struct device *cdev = container_of(kobj, struct device, kobj);
2047 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2048 struct iscsi_transport *t = conn->transport;
2049 int param;
2050
2051 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2052 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2053 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2054 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2055 else if (attr == &dev_attr_conn_header_digest.attr)
2056 param = ISCSI_PARAM_HDRDGST_EN;
2057 else if (attr == &dev_attr_conn_data_digest.attr)
2058 param = ISCSI_PARAM_DATADGST_EN;
2059 else if (attr == &dev_attr_conn_ifmarker.attr)
2060 param = ISCSI_PARAM_IFMARKER_EN;
2061 else if (attr == &dev_attr_conn_ofmarker.attr)
2062 param = ISCSI_PARAM_OFMARKER_EN;
2063 else if (attr == &dev_attr_conn_address.attr)
2064 param = ISCSI_PARAM_CONN_ADDRESS;
2065 else if (attr == &dev_attr_conn_port.attr)
2066 param = ISCSI_PARAM_CONN_PORT;
2067 else if (attr == &dev_attr_conn_exp_statsn.attr)
2068 param = ISCSI_PARAM_EXP_STATSN;
2069 else if (attr == &dev_attr_conn_persistent_address.attr)
2070 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2071 else if (attr == &dev_attr_conn_persistent_port.attr)
2072 param = ISCSI_PARAM_PERSISTENT_PORT;
2073 else if (attr == &dev_attr_conn_ping_tmo.attr)
2074 param = ISCSI_PARAM_PING_TMO;
2075 else if (attr == &dev_attr_conn_recv_tmo.attr)
2076 param = ISCSI_PARAM_RECV_TMO;
2077 else {
2078 WARN_ONCE(1, "Invalid conn attr");
2079 return 0;
2080 }
2081
2082 return t->attr_is_visible(ISCSI_PARAM, param);
2083}
2084
2085static struct attribute_group iscsi_conn_group = {
2086 .attrs = iscsi_conn_attrs,
2087 .is_visible = iscsi_conn_attr_is_visible,
2088};
2089
1da177e4 2090/*
0896b752 2091 * iSCSI session attrs
1da177e4 2092 */
b2c64167 2093#define iscsi_session_attr_show(param, perm) \
fd7255f5 2094static ssize_t \
ee959b00
TJ		 2095show_session_param_##param(struct device *dev, \
2096 struct device_attribute *attr, char *buf) \
fd7255f5 2097{ \
ee959b00
TJ		 2098 struct iscsi_cls_session *session = \
2099 iscsi_dev_to_session(dev->parent); \
fd7255f5 2100 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2101 \
2102 if (perm && !capable(CAP_SYS_ADMIN)) \
2103 return -EACCES; \
a54a52ca 2104 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2105}
2106
b2c64167
MC		 2107#define iscsi_session_attr(field, param, perm) \
2108 iscsi_session_attr_show(param, perm) \
a54a52ca 2109static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5 2110 NULL);
b2c64167
MC		 2111iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2112iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2113iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2114iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2115iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2116iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2117iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2118iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2119iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2120iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2121iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2122iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2123iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2124iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 2125iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2126iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2127iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2128iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2129iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2130iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2131iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2132
6eabafbe 2133static ssize_t
ee959b00
TJ		 2134show_priv_session_state(struct device *dev, struct device_attribute *attr,
2135 char *buf)
6eabafbe 2136{
ee959b00 2137 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2138 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2139}
2140static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2141 NULL);
2142
fd7255f5
MC		 2143#define iscsi_priv_session_attr_show(field, format) \
2144static ssize_t \
ee959b00
TJ		 2145show_priv_session_##field(struct device *dev, \
2146 struct device_attribute *attr, char *buf) \
fd7255f5 2147{ \
ee959b00
TJ		 2148 struct iscsi_cls_session *session = \
2149 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2150 if (session->field == -1) \
2151 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2152 return sprintf(buf, format"\n", session->field); \
2153}
2154
fe4f0bde
VC		 2155#define iscsi_priv_session_attr_store(field) \
2156static ssize_t \
2157store_priv_session_##field(struct device *dev, \
2158 struct device_attribute *attr, \
2159 const char *buf, size_t count) \
2160{ \
2161 int val; \
2162 char *cp; \
2163 struct iscsi_cls_session *session = \
2164 iscsi_dev_to_session(dev->parent); \
2165 if ((session->state == ISCSI_SESSION_FREE) || \
2166 (session->state == ISCSI_SESSION_FAILED)) \
2167 return -EBUSY; \
2168 if (strncmp(buf, "off", 3) == 0) \
2169 session->field = -1; \
2170 else { \
2171 val = simple_strtoul(buf, &cp, 0); \
2172 if (*cp != '\0' && *cp != '\n') \
2173 return -EINVAL; \
2174 session->field = val; \
2175 } \
2176 return count; \
2177}
2178
2179#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2180 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2181 iscsi_priv_session_attr_store(field) \
523f3c80 2182static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2183 show_priv_session_##field, \
2184 store_priv_session_##field)
2185iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2186
1d063c17
MC		 2187static struct attribute *iscsi_session_attrs[] = {
2188 &dev_attr_sess_initial_r2t.attr,
2189 &dev_attr_sess_max_outstanding_r2t.attr,
2190 &dev_attr_sess_immediate_data.attr,
2191 &dev_attr_sess_first_burst_len.attr,
2192 &dev_attr_sess_max_burst_len.attr,
2193 &dev_attr_sess_data_pdu_in_order.attr,
2194 &dev_attr_sess_data_seq_in_order.attr,
2195 &dev_attr_sess_erl.attr,
2196 &dev_attr_sess_targetname.attr,
2197 &dev_attr_sess_tpgt.attr,
2198 &dev_attr_sess_password.attr,
2199 &dev_attr_sess_password_in.attr,
2200 &dev_attr_sess_username.attr,
2201 &dev_attr_sess_username_in.attr,
2202 &dev_attr_sess_fast_abort.attr,
2203 &dev_attr_sess_abort_tmo.attr,
2204 &dev_attr_sess_lu_reset_tmo.attr,
2205 &dev_attr_sess_tgt_reset_tmo.attr,
2206 &dev_attr_sess_ifacename.attr,
2207 &dev_attr_sess_initiatorname.attr,
2208 &dev_attr_sess_targetalias.attr,
2209 &dev_attr_priv_sess_recovery_tmo.attr,
2210 &dev_attr_priv_sess_state.attr,
2211 NULL,
2212};
2213
2214static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2215 struct attribute *attr, int i)
2216{
2217 struct device *cdev = container_of(kobj, struct device, kobj);
2218 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2219 struct iscsi_transport *t = session->transport;
2220 int param;
2221
2222 if (attr == &dev_attr_sess_initial_r2t.attr)
2223 param = ISCSI_PARAM_INITIAL_R2T_EN;
2224 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2225 param = ISCSI_PARAM_MAX_R2T;
2226 else if (attr == &dev_attr_sess_immediate_data.attr)
2227 param = ISCSI_PARAM_IMM_DATA_EN;
2228 else if (attr == &dev_attr_sess_first_burst_len.attr)
2229 param = ISCSI_PARAM_FIRST_BURST;
2230 else if (attr == &dev_attr_sess_max_burst_len.attr)
2231 param = ISCSI_PARAM_MAX_BURST;
2232 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2233 param = ISCSI_PARAM_PDU_INORDER_EN;
2234 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2235 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2236 else if (attr == &dev_attr_sess_erl.attr)
2237 param = ISCSI_PARAM_ERL;
2238 else if (attr == &dev_attr_sess_targetname.attr)
2239 param = ISCSI_PARAM_TARGET_NAME;
2240 else if (attr == &dev_attr_sess_tpgt.attr)
2241 param = ISCSI_PARAM_TPGT;
2242 else if (attr == &dev_attr_sess_password.attr)
2243 param = ISCSI_PARAM_USERNAME;
2244 else if (attr == &dev_attr_sess_password_in.attr)
2245 param = ISCSI_PARAM_USERNAME_IN;
2246 else if (attr == &dev_attr_sess_username.attr)
2247 param = ISCSI_PARAM_PASSWORD;
2248 else if (attr == &dev_attr_sess_username_in.attr)
2249 param = ISCSI_PARAM_PASSWORD_IN;
2250 else if (attr == &dev_attr_sess_fast_abort.attr)
2251 param = ISCSI_PARAM_FAST_ABORT;
2252 else if (attr == &dev_attr_sess_abort_tmo.attr)
2253 param = ISCSI_PARAM_ABORT_TMO;
2254 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2255 param = ISCSI_PARAM_LU_RESET_TMO;
2256 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2257 param = ISCSI_PARAM_TGT_RESET_TMO;
2258 else if (attr == &dev_attr_sess_ifacename.attr)
2259 param = ISCSI_PARAM_IFACE_NAME;
2260 else if (attr == &dev_attr_sess_initiatorname.attr)
2261 param = ISCSI_PARAM_INITIATOR_NAME;
2262 else if (attr == &dev_attr_sess_targetalias.attr)
2263 param = ISCSI_PARAM_TARGET_ALIAS;
2264 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2265 return S_IRUGO | S_IWUSR;
2266 else if (attr == &dev_attr_priv_sess_state.attr)
2267 return S_IRUGO;
2268 else {
2269 WARN_ONCE(1, "Invalid session attr");
2270 return 0;
2271 }
2272
2273 return t->attr_is_visible(ISCSI_PARAM, param);
2274}
2275
2276static struct attribute_group iscsi_session_group = {
2277 .attrs = iscsi_session_attrs,
2278 .is_visible = iscsi_session_attr_is_visible,
2279};
2280
1819dc81
MC		 2281/*
2282 * iSCSI host attrs
2283 */
2284#define iscsi_host_attr_show(param) \
2285static ssize_t \
ee959b00
TJ		 2286show_host_param_##param(struct device *dev, \
2287 struct device_attribute *attr, char *buf) \
1819dc81 2288{ \
ee959b00 2289 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2290 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2291 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2292}
2293
2294#define iscsi_host_attr(field, param) \
2295 iscsi_host_attr_show(param) \
2296static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2297 NULL);
2298
d8196ed2 2299iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2300iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2301iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2302iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 2303
1819dc81
MC		 2304#define SETUP_HOST_RD_ATTR(field, param_flag) \
2305do { \
2306 if (tt->host_param_mask & param_flag) { \
ee959b00 2307 priv->host_attrs[count] = &dev_attr_host_##field; \
1819dc81
MC		 2308 count++; \
2309 } \
2310} while (0)
2311
0896b752
AA		 2312static int iscsi_session_match(struct attribute_container *cont,
2313 struct device *dev)
1da177e4 2314{
7b8631b5 2315 struct iscsi_cls_session *session;
1da177e4 2316 struct Scsi_Host *shost;
0896b752
AA		 2317 struct iscsi_internal *priv;
2318
2319 if (!iscsi_is_session_dev(dev))
2320 return 0;
1da177e4 2321
7b8631b5
MC		 2322 session = iscsi_dev_to_session(dev);
2323 shost = iscsi_session_to_shost(session);
0896b752 2324 if (!shost->transportt)
1da177e4
LT		 2325 return 0;
2326
0896b752
AA		 2327 priv = to_iscsi_internal(shost->transportt);
2328 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2329 return 0;
2330
0896b752 2331 return &priv->session_cont.ac == cont;
1da177e4
LT		 2332}
2333
0896b752
AA		 2334static int iscsi_conn_match(struct attribute_container *cont,
2335 struct device *dev)
2336{
7b8631b5
MC		 2337 struct iscsi_cls_session *session;
2338 struct iscsi_cls_conn *conn;
1da177e4 2339 struct Scsi_Host *shost;
0896b752 2340 struct iscsi_internal *priv;
1da177e4 2341
0896b752 2342 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2343 return 0;
2344
7b8631b5
MC		 2345 conn = iscsi_dev_to_conn(dev);
2346 session = iscsi_dev_to_session(conn->dev.parent);
2347 shost = iscsi_session_to_shost(session);
2348
0896b752 2349 if (!shost->transportt)
1da177e4
LT		 2350 return 0;
2351
0896b752
AA		 2352 priv = to_iscsi_internal(shost->transportt);
2353 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2354 return 0;
1da177e4 2355
0896b752
AA		 2356 return &priv->conn_cont.ac == cont;
2357}
2358
30a6c652
MC		 2359static int iscsi_host_match(struct attribute_container *cont,
2360 struct device *dev)
2361{
2362 struct Scsi_Host *shost;
2363 struct iscsi_internal *priv;
2364
2365 if (!scsi_is_host_device(dev))
2366 return 0;
2367
2368 shost = dev_to_shost(dev);
2369 if (!shost->transportt ||
2370 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2371 return 0;
2372
2373 priv = to_iscsi_internal(shost->transportt);
2374 return &priv->t.host_attrs.ac == cont;
2375}
2376
7b8631b5
MC		 2377struct scsi_transport_template *
2378iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2379{
2380 struct iscsi_internal *priv;
2381 unsigned long flags;
2382 int count = 0, err;
2383
2384 BUG_ON(!tt);
2385
2386 priv = iscsi_if_transport_lookup(tt);
2387 if (priv)
7b8631b5 2388 return NULL;
0896b752 2389
24669f75 2390 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2391 if (!priv)
7b8631b5 2392 return NULL;
0896b752 2393 INIT_LIST_HEAD(&priv->list);
0896b752 2394 priv->iscsi_transport = tt;
30a6c652 2395 priv->t.user_scan = iscsi_user_scan;
06d25af4 2396 priv->t.create_work_queue = 1;
0896b752 2397
ee959b00 2398 priv->dev.class = &iscsi_transport_class;
71610f55 2399 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2400 err = device_register(&priv->dev);
0896b752
AA		 2401 if (err)
2402 goto free_priv;
2403
ee959b00 2404 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2405 if (err)
ee959b00 2406 goto unregister_dev;
0896b752 2407
30a6c652
MC		 2408 /* host parameters */
2409 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2410 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2411 priv->t.host_attrs.ac.match = iscsi_host_match;
32c6e1b9 2412 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2413 transport_container_register(&priv->t.host_attrs);
2414
d8196ed2 2415 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
22236961 2416 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1819dc81 2417 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
8ad5781a 2418 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1819dc81
MC		 2419 BUG_ON(count > ISCSI_HOST_ATTRS);
2420 priv->host_attrs[count] = NULL;
2421 count = 0;
2422
0896b752 2423 /* connection parameters */
0896b752
AA		 2424 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2425 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2426 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2427 transport_container_register(&priv->conn_cont);
1da177e4 2428
0896b752 2429 /* session parameters */
0896b752
AA		 2430 priv->session_cont.ac.class = &iscsi_session_class.class;
2431 priv->session_cont.ac.match = iscsi_session_match;
1d063c17 2432 priv->session_cont.ac.grp = &iscsi_session_group;
0896b752
AA		 2433 transport_container_register(&priv->session_cont);
2434
0896b752
AA		 2435 spin_lock_irqsave(&iscsi_transport_lock, flags);
2436 list_add(&priv->list, &iscsi_transports);
2437 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2438
2439 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2440 return &priv->t;
1da177e4 2441
ee959b00
TJ		 2442unregister_dev:
2443 device_unregister(&priv->dev);
d82ff9be 2444 return NULL;
0896b752
AA		 2445free_priv:
2446 kfree(priv);
7b8631b5 2447 return NULL;
1da177e4 2448}
0896b752
AA		 2449EXPORT_SYMBOL_GPL(iscsi_register_transport);
2450
2451int iscsi_unregister_transport(struct iscsi_transport *tt)
2452{
2453 struct iscsi_internal *priv;
2454 unsigned long flags;
2455
2456 BUG_ON(!tt);
2457
0b950672 2458 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2459
2460 priv = iscsi_if_transport_lookup(tt);
2461 BUG_ON (!priv);
2462
0896b752
AA		 2463 spin_lock_irqsave(&iscsi_transport_lock, flags);
2464 list_del(&priv->list);
2465 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2466
2467 transport_container_unregister(&priv->conn_cont);
2468 transport_container_unregister(&priv->session_cont);
30a6c652 2469 transport_container_unregister(&priv->t.host_attrs);
0896b752 2470
ee959b00
TJ		 2471 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2472 device_unregister(&priv->dev);
0b950672 2473 mutex_unlock(&rx_queue_mutex);
1da177e4 2474
0896b752
AA		 2475 return 0;
2476}
2477EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2478
1da177e4
LT		 2479static __init int iscsi_transport_init(void)
2480{
0896b752 2481 int err;
1da177e4 2482
09492605 2483 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2484 ISCSI_TRANSPORT_VERSION);
2485
41be1444
MC		 2486 atomic_set(&iscsi_session_nr, 0);
2487
0896b752 2488 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2489 if (err)
2490 return err;
0896b752 2491
d82ff9be 2492 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2493 if (err)
2494 goto unregister_transport_class;
2495
8d07913d 2496 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2497 if (err)
2498 goto unregister_endpoint_class;
2499
8d07913d
MC		 2500 err = transport_class_register(&iscsi_host_class);
2501 if (err)
2502 goto unregister_iface_class;
2503
30a6c652
MC		 2504 err = transport_class_register(&iscsi_connection_class);
2505 if (err)
2506 goto unregister_host_class;
2507
0896b752
AA		 2508 err = transport_class_register(&iscsi_session_class);
2509 if (err)
2510 goto unregister_conn_class;
2511
d82ff9be
MC		 2512 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2513 NULL, THIS_MODULE);
0896b752
AA		 2514 if (!nls) {
2515 err = -ENOBUFS;
43a145a3 2516 goto unregister_session_class;
0896b752
AA		 2517 }
2518
d8bf541e
MC		 2519 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2520 if (!iscsi_eh_timer_workq)
2521 goto release_nls;
2522
43a145a3 2523 return 0;
0896b752 2524
d8bf541e 2525release_nls:
b7c6ba6e 2526 netlink_kernel_release(nls);
0896b752
AA		 2527unregister_session_class:
2528 transport_class_unregister(&iscsi_session_class);
2529unregister_conn_class:
2530 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2531unregister_host_class:
2532 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2533unregister_iface_class:
2534 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2535unregister_endpoint_class:
2536 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2537unregister_transport_class:
2538 class_unregister(&iscsi_transport_class);
2539 return err;
1da177e4
LT		 2540}
2541
2542static void __exit iscsi_transport_exit(void)
2543{
d8bf541e 2544 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2545 netlink_kernel_release(nls);
0896b752
AA		 2546 transport_class_unregister(&iscsi_connection_class);
2547 transport_class_unregister(&iscsi_session_class);
30a6c652 2548 transport_class_unregister(&iscsi_host_class);
d82ff9be 2549 class_unregister(&iscsi_endpoint_class);
8d07913d 2550 class_unregister(&iscsi_iface_class);
0896b752 2551 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2552}
2553
2554module_init(iscsi_transport_init);
2555module_exit(iscsi_transport_exit);
2556
0896b752
AA		 2557MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2558 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2559 "Alex Aizman <itn780@yahoo.com>");
2560MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2561MODULE_LICENSE("GPL");
f4246b33 2562MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 2563MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
Linux kernel - Deliverables
This page took 0.847118 seconds and 5 git commands to generate.