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[SCSI] iscsi cls: sysfs group is_visible callout for conn attrs
[mirror_ubuntu-artful-kernel.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
3b2bef1f 35#define ISCSI_SESSION_ATTRS 23
c238c3bb 36#define ISCSI_CONN_ATTRS 13
d8196ed2 37#define ISCSI_HOST_ATTRS 4
d82ff9be 38
4c2133c8 39#define ISCSI_TRANSPORT_VERSION "2.0-870"
1da177e4 40
632248aa
MC		 41static int dbg_session;
42module_param_named(debug_session, dbg_session, int,
43 S_IRUGO | S_IWUSR);
44MODULE_PARM_DESC(debug_session,
45 "Turn on debugging for sessions in scsi_transport_iscsi "
46 "module. Set to 1 to turn on, and zero to turn off. Default "
47 "is off.");
48
49static int dbg_conn;
50module_param_named(debug_conn, dbg_conn, int,
51 S_IRUGO | S_IWUSR);
52MODULE_PARM_DESC(debug_conn,
53 "Turn on debugging for connections in scsi_transport_iscsi "
54 "module. Set to 1 to turn on, and zero to turn off. Default "
55 "is off.");
56
57#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58 do { \
59 if (dbg_session) \
60 iscsi_cls_session_printk(KERN_INFO, _session, \
61 "%s: " dbg_fmt, \
62 __func__, ##arg); \
63 } while (0);
64
65#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
66 do { \
67 if (dbg_conn) \
68 iscsi_cls_conn_printk(KERN_INFO, _conn, \
69 "%s: " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
1da177e4
LT		 73struct iscsi_internal {
74 struct scsi_transport_template t;
0896b752
AA		 75 struct iscsi_transport *iscsi_transport;
76 struct list_head list;
ee959b00 77 struct device dev;
30a6c652 78
ee959b00 79 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
0896b752 80 struct transport_container conn_cont;
0896b752 81 struct transport_container session_cont;
ee959b00 82 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
1da177e4
LT		 83};
84
41be1444 85static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
d8bf541e 86static struct workqueue_struct *iscsi_eh_timer_workq;
b5c7a12d 87
0896b752
AA		 88/*
89 * list of registered transports and lock that must
90 * be held while accessing list. The iscsi_transport_lock must
0b950672 91 * be acquired after the rx_queue_mutex.
0896b752
AA		 92 */
93static LIST_HEAD(iscsi_transports);
94static DEFINE_SPINLOCK(iscsi_transport_lock);
95
96#define to_iscsi_internal(tmpl) \
97 container_of(tmpl, struct iscsi_internal, t)
98
ee959b00
TJ		 99#define dev_to_iscsi_internal(_dev) \
100 container_of(_dev, struct iscsi_internal, dev)
0896b752 101
ee959b00 102static void iscsi_transport_release(struct device *dev)
0896b752 103{
ee959b00 104 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
0896b752
AA		 105 kfree(priv);
106}
1da177e4 107
0896b752
AA		 108/*
109 * iscsi_transport_class represents the iscsi_transports that are
110 * registered.
111 */
112static struct class iscsi_transport_class = {
113 .name = "iscsi_transport",
ee959b00 114 .dev_release = iscsi_transport_release,
0896b752
AA		 115};
116
117static ssize_t
ee959b00
TJ		 118show_transport_handle(struct device *dev, struct device_attribute *attr,
119 char *buf)
0896b752 120{
ee959b00 121 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
762e2bfa 122 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752 123}
ee959b00 124static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
0896b752
AA		 125
126#define show_transport_attr(name, format) \
127static ssize_t \
ee959b00
TJ		 128show_transport_##name(struct device *dev, \
129 struct device_attribute *attr,char *buf) \
0896b752 130{ \
ee959b00 131 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
0896b752
AA		 132 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
133} \
ee959b00 134static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
0896b752
AA		 135
136show_transport_attr(caps, "0x%x");
0896b752
AA		 137
138static struct attribute *iscsi_transport_attrs[] = {
ee959b00
TJ		 139 &dev_attr_handle.attr,
140 &dev_attr_caps.attr,
0896b752
AA		 141 NULL,
142};
143
144static struct attribute_group iscsi_transport_group = {
145 .attrs = iscsi_transport_attrs,
146};
147
d82ff9be
MC		 148/*
149 * iSCSI endpoint attrs
150 */
151#define iscsi_dev_to_endpoint(_dev) \
152 container_of(_dev, struct iscsi_endpoint, dev)
153
154#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
155struct device_attribute dev_attr_##_prefix##_##_name = \
156 __ATTR(_name,_mode,_show,_store)
157
158static void iscsi_endpoint_release(struct device *dev)
159{
160 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
161 kfree(ep);
162}
163
164static struct class iscsi_endpoint_class = {
165 .name = "iscsi_endpoint",
166 .dev_release = iscsi_endpoint_release,
167};
168
169static ssize_t
170show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
171{
172 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 173 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
d82ff9be
MC		 174}
175static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
176
177static struct attribute *iscsi_endpoint_attrs[] = {
178 &dev_attr_ep_handle.attr,
179 NULL,
180};
181
182static struct attribute_group iscsi_endpoint_group = {
183 .attrs = iscsi_endpoint_attrs,
184};
185
186#define ISCSI_MAX_EPID -1
187
188static int iscsi_match_epid(struct device *dev, void *data)
189{
190 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 191 uint64_t *epid = (uint64_t *) data;
d82ff9be
MC		 192
193 return *epid == ep->id;
194}
195
196struct iscsi_endpoint *
197iscsi_create_endpoint(int dd_size)
198{
199 struct device *dev;
200 struct iscsi_endpoint *ep;
21536062 201 uint64_t id;
d82ff9be
MC		 202 int err;
203
204 for (id = 1; id < ISCSI_MAX_EPID; id++) {
695794ae 205 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
d82ff9be
MC		 206 iscsi_match_epid);
207 if (!dev)
208 break;
209 }
210 if (id == ISCSI_MAX_EPID) {
211 printk(KERN_ERR "Too many connections. Max supported %u\n",
212 ISCSI_MAX_EPID - 1);
213 return NULL;
214 }
215
216 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
217 if (!ep)
218 return NULL;
219
220 ep->id = id;
221 ep->dev.class = &iscsi_endpoint_class;
71610f55 222 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
d82ff9be
MC		 223 err = device_register(&ep->dev);
224 if (err)
225 goto free_ep;
226
227 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
228 if (err)
229 goto unregister_dev;
230
231 if (dd_size)
232 ep->dd_data = &ep[1];
233 return ep;
234
235unregister_dev:
236 device_unregister(&ep->dev);
237 return NULL;
238
239free_ep:
240 kfree(ep);
241 return NULL;
242}
243EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
244
245void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
246{
247 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
248 device_unregister(&ep->dev);
249}
250EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
251
252struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
253{
f80f868e 254 struct iscsi_endpoint *ep;
d82ff9be
MC		 255 struct device *dev;
256
695794ae 257 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
d82ff9be
MC		 258 iscsi_match_epid);
259 if (!dev)
260 return NULL;
261
f80f868e
MC		 262 ep = iscsi_dev_to_endpoint(dev);
263 /*
264 * we can drop this now because the interface will prevent
265 * removals and lookups from racing.
266 */
267 put_device(dev);
268 return ep;
d82ff9be
MC		 269}
270EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
271
8d07913d
MC		 272/*
273 * Interface to display network param to sysfs
274 */
275
276static void iscsi_iface_release(struct device *dev)
277{
278 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
279 struct device *parent = iface->dev.parent;
280
281 kfree(iface);
282 put_device(parent);
283}
284
285
286static struct class iscsi_iface_class = {
287 .name = "iscsi_iface",
288 .dev_release = iscsi_iface_release,
289};
290
291#define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
292struct device_attribute dev_attr_##_prefix##_##_name = \
293 __ATTR(_name, _mode, _show, _store)
294
295/* iface attrs show */
296#define iscsi_iface_attr_show(type, name, param_type, param) \
297static ssize_t \
298show_##type##_##name(struct device *dev, struct device_attribute *attr, \
299 char *buf) \
300{ \
301 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
302 struct iscsi_transport *t = iface->transport; \
303 return t->get_iface_param(iface, param_type, param, buf); \
304} \
305
306#define iscsi_iface_net_attr(type, name, param) \
307 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
308static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
309
310/* generic read only ipvi4 attribute */
311iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
312iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
313iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
314iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
315
316/* generic read only ipv6 attribute */
317iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
318iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
319iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
320iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
321 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
322iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
323 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
324
325/* common read only iface attribute */
326iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
327iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
328
329static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
330 struct attribute *attr, int i)
331{
332 struct device *dev = container_of(kobj, struct device, kobj);
333 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
334 struct iscsi_transport *t = iface->transport;
335
336 if (attr == &dev_attr_iface_enabled.attr)
337 return (t->iface_param_mask & ISCSI_NET_IFACE_ENABLE) ?
338 S_IRUGO : 0;
339 else if (attr == &dev_attr_iface_vlan.attr)
340 return (t->iface_param_mask & ISCSI_NET_VLAN_ID) ? S_IRUGO : 0;
341
342 if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
343 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
344 return (t->iface_param_mask & ISCSI_NET_IPV4_ADDR) ?
345 S_IRUGO : 0;
346 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
347 return (t->iface_param_mask & ISCSI_NET_IPV4_GW) ?
348 S_IRUGO : 0;
349 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
350 return (t->iface_param_mask & ISCSI_NET_IPV4_SUBNET) ?
351 S_IRUGO : 0;
352 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
353 return (t->iface_param_mask & ISCSI_NET_IPV4_BOOTPROTO) ?
354 S_IRUGO : 0;
355 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
356 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
357 return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR) ?
358 S_IRUGO : 0;
359 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
360 return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL) ?
361 S_IRUGO : 0;
362 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
363 return (t->iface_param_mask & ISCSI_NET_IPV6_ROUTER) ?
364 S_IRUGO : 0;
365 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
366 return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR_AUTOCFG) ?
367 S_IRUGO : 0;
368 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
369 return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL_AUTOCFG) ?
370 S_IRUGO : 0;
371 }
372
373 return 0;
374}
375
376static struct attribute *iscsi_iface_attrs[] = {
377 &dev_attr_iface_enabled.attr,
378 &dev_attr_iface_vlan.attr,
379 &dev_attr_ipv4_iface_ipaddress.attr,
380 &dev_attr_ipv4_iface_gateway.attr,
381 &dev_attr_ipv4_iface_subnet.attr,
382 &dev_attr_ipv4_iface_bootproto.attr,
383 &dev_attr_ipv6_iface_ipaddress.attr,
384 &dev_attr_ipv6_iface_link_local_addr.attr,
385 &dev_attr_ipv6_iface_router_addr.attr,
386 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
387 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
388 NULL,
389};
390
391static struct attribute_group iscsi_iface_group = {
392 .attrs = iscsi_iface_attrs,
393 .is_visible = iscsi_iface_attr_is_visible,
394};
395
396struct iscsi_iface *
397iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
398 uint32_t iface_type, uint32_t iface_num, int dd_size)
399{
400 struct iscsi_iface *iface;
401 int err;
402
403 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
404 if (!iface)
405 return NULL;
406
407 iface->transport = transport;
408 iface->iface_type = iface_type;
409 iface->iface_num = iface_num;
410 iface->dev.release = iscsi_iface_release;
411 iface->dev.class = &iscsi_iface_class;
412 /* parent reference released in iscsi_iface_release */
413 iface->dev.parent = get_device(&shost->shost_gendev);
414 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
415 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
416 iface_num);
417 else
418 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
419 iface_num);
420
421 err = device_register(&iface->dev);
422 if (err)
423 goto free_iface;
424
425 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
426 if (err)
427 goto unreg_iface;
428
429 if (dd_size)
430 iface->dd_data = &iface[1];
431 return iface;
432
433unreg_iface:
434 device_unregister(&iface->dev);
435 return NULL;
436
437free_iface:
438 put_device(iface->dev.parent);
439 kfree(iface);
440 return NULL;
441}
442EXPORT_SYMBOL_GPL(iscsi_create_iface);
443
444void iscsi_destroy_iface(struct iscsi_iface *iface)
445{
446 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
447 device_unregister(&iface->dev);
448}
449EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
450
30a6c652 451static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 452 struct device *cdev)
30a6c652
MC		 453{
454 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 455 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 456
457 memset(ihost, 0, sizeof(*ihost));
8aae18ad 458 atomic_set(&ihost->nr_scans, 0);
7970634b 459 mutex_init(&ihost->mutex);
30a6c652
MC		 460 return 0;
461}
462
463static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
464 "iscsi_host",
465 iscsi_setup_host,
06d25af4 466 NULL,
30a6c652
MC		 467 NULL);
468
0896b752
AA		 469static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
470 "iscsi_session",
1da177e4
LT		 471 NULL,
472 NULL,
473 NULL);
474
0896b752
AA		 475static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
476 "iscsi_connection",
1da177e4
LT		 477 NULL,
478 NULL,
479 NULL);
0896b752
AA		 480
481static struct sock *nls;
0b950672 482static DEFINE_MUTEX(rx_queue_mutex);
0896b752 483
7b7232f3
MC		 484static LIST_HEAD(sesslist);
485static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 486static LIST_HEAD(connlist);
487static DEFINE_SPINLOCK(connlock);
0896b752 488
b5c7a12d
MC		 489static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
490{
491 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
492 return sess->sid;
493}
494
495/*
496 * Returns the matching session to a given sid
497 */
498static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 499{
500 unsigned long flags;
501 struct iscsi_cls_session *sess;
502
503 spin_lock_irqsave(&sesslock, flags);
504 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 505 if (sess->sid == sid) {
7b7232f3
MC		 506 spin_unlock_irqrestore(&sesslock, flags);
507 return sess;
508 }
509 }
510 spin_unlock_irqrestore(&sesslock, flags);
511 return NULL;
512}
513
b5c7a12d
MC		 514/*
515 * Returns the matching connection to a given sid / cid tuple
516 */
517static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 518{
519 unsigned long flags;
520 struct iscsi_cls_conn *conn;
521
522 spin_lock_irqsave(&connlock, flags);
523 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 524 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 525 spin_unlock_irqrestore(&connlock, flags);
526 return conn;
527 }
528 }
529 spin_unlock_irqrestore(&connlock, flags);
530 return NULL;
531}
532
7b8631b5
MC		 533/*
534 * The following functions can be used by LLDs that allocate
535 * their own scsi_hosts or by software iscsi LLDs
536 */
6eabafbe
MC		 537static struct {
538 int value;
539 char *name;
540} iscsi_session_state_names[] = {
541 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
542 { ISCSI_SESSION_FAILED, "FAILED" },
543 { ISCSI_SESSION_FREE, "FREE" },
544};
545
3b0f208a 546static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 547{
548 int i;
549 char *name = NULL;
550
551 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
552 if (iscsi_session_state_names[i].value == state) {
553 name = iscsi_session_state_names[i].name;
554 break;
555 }
556 }
557 return name;
558}
559
560int iscsi_session_chkready(struct iscsi_cls_session *session)
561{
562 unsigned long flags;
563 int err;
564
565 spin_lock_irqsave(&session->lock, flags);
566 switch (session->state) {
567 case ISCSI_SESSION_LOGGED_IN:
568 err = 0;
569 break;
570 case ISCSI_SESSION_FAILED:
9a1a69a1 571 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 572 break;
573 case ISCSI_SESSION_FREE:
56d7fcfa 574 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 575 break;
576 default:
577 err = DID_NO_CONNECT << 16;
578 break;
579 }
580 spin_unlock_irqrestore(&session->lock, flags);
581 return err;
582}
583EXPORT_SYMBOL_GPL(iscsi_session_chkready);
584
7b8631b5
MC		 585static void iscsi_session_release(struct device *dev)
586{
587 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 588 struct Scsi_Host *shost;
0896b752 589
7b8631b5
MC		 590 shost = iscsi_session_to_shost(session);
591 scsi_host_put(shost);
632248aa 592 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
7b8631b5 593 kfree(session);
7b8631b5 594}
0896b752 595
7b8631b5
MC		 596static int iscsi_is_session_dev(const struct device *dev)
597{
598 return dev->release == iscsi_session_release;
599}
0896b752 600
a4804cd6
MC		 601static int iscsi_iter_session_fn(struct device *dev, void *data)
602{
603 void (* fn) (struct iscsi_cls_session *) = data;
604
605 if (!iscsi_is_session_dev(dev))
606 return 0;
607 fn(iscsi_dev_to_session(dev));
608 return 0;
609}
610
611void iscsi_host_for_each_session(struct Scsi_Host *shost,
612 void (*fn)(struct iscsi_cls_session *))
613{
614 device_for_each_child(&shost->shost_gendev, fn,
615 iscsi_iter_session_fn);
616}
617EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
618
8aae18ad
MC		 619/**
620 * iscsi_scan_finished - helper to report when running scans are done
621 * @shost: scsi host
622 * @time: scan run time
623 *
624 * This function can be used by drives like qla4xxx to report to the scsi
625 * layer when the scans it kicked off at module load time are done.
626 */
627int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
628{
32c6e1b9 629 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 630 /*
631 * qla4xxx will have kicked off some session unblocks before calling
632 * scsi_scan_host, so just wait for them to complete.
633 */
634 return !atomic_read(&ihost->nr_scans);
635}
636EXPORT_SYMBOL_GPL(iscsi_scan_finished);
637
7970634b
MC		 638struct iscsi_scan_data {
639 unsigned int channel;
640 unsigned int id;
641 unsigned int lun;
642};
643
644static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 645{
7970634b 646 struct iscsi_scan_data *scan_data = data;
30a6c652 647 struct iscsi_cls_session *session;
7970634b
MC		 648 struct Scsi_Host *shost;
649 struct iscsi_cls_host *ihost;
650 unsigned long flags;
651 unsigned int id;
652
653 if (!iscsi_is_session_dev(dev))
654 return 0;
655
656 session = iscsi_dev_to_session(dev);
632248aa
MC		 657
658 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
659
7970634b
MC		 660 shost = iscsi_session_to_shost(session);
661 ihost = shost->shost_data;
30a6c652
MC		 662
663 mutex_lock(&ihost->mutex);
7970634b
MC		 664 spin_lock_irqsave(&session->lock, flags);
665 if (session->state != ISCSI_SESSION_LOGGED_IN) {
666 spin_unlock_irqrestore(&session->lock, flags);
632248aa 667 goto user_scan_exit;
30a6c652 668 }
7970634b
MC		 669 id = session->target_id;
670 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 671
7970634b
MC		 672 if (id != ISCSI_MAX_TARGET) {
673 if ((scan_data->channel == SCAN_WILD_CARD ||
674 scan_data->channel == 0) &&
675 (scan_data->id == SCAN_WILD_CARD ||
676 scan_data->id == id))
677 scsi_scan_target(&session->dev, 0, id,
678 scan_data->lun, 1);
679 }
632248aa
MC		 680
681user_scan_exit:
7970634b 682 mutex_unlock(&ihost->mutex);
632248aa 683 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 684 return 0;
685}
686
7970634b
MC		 687static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
688 uint id, uint lun)
689{
690 struct iscsi_scan_data scan_data;
691
692 scan_data.channel = channel;
693 scan_data.id = id;
694 scan_data.lun = lun;
695
696 return device_for_each_child(&shost->shost_gendev, &scan_data,
697 iscsi_user_scan_session);
698}
699
bd976f62
MC		 700static void iscsi_scan_session(struct work_struct *work)
701{
702 struct iscsi_cls_session *session =
703 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 704 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 705 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 706 struct iscsi_scan_data scan_data;
bd976f62 707
7970634b
MC		 708 scan_data.channel = 0;
709 scan_data.id = SCAN_WILD_CARD;
710 scan_data.lun = SCAN_WILD_CARD;
bd976f62 711
7970634b 712 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 713 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 714}
715
c01be6dc
MC		 716/**
717 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 718 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 719 *
720 * If the session is down this function will wait for the recovery
721 * timer to fire or for the session to be logged back in. If the
722 * recovery timer fires then FAST_IO_FAIL is returned. The caller
723 * should pass this error value to the scsi eh.
724 */
725int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
726{
727 struct iscsi_cls_session *session =
728 starget_to_session(scsi_target(cmd->device));
729 unsigned long flags;
730 int ret = 0;
731
732 spin_lock_irqsave(&session->lock, flags);
733 while (session->state != ISCSI_SESSION_LOGGED_IN) {
734 if (session->state == ISCSI_SESSION_FREE) {
735 ret = FAST_IO_FAIL;
736 break;
737 }
738 spin_unlock_irqrestore(&session->lock, flags);
739 msleep(1000);
740 spin_lock_irqsave(&session->lock, flags);
741 }
742 spin_unlock_irqrestore(&session->lock, flags);
743 return ret;
744}
745EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
746
c4028958 747static void session_recovery_timedout(struct work_struct *work)
30a6c652 748{
c4028958
DH		 749 struct iscsi_cls_session *session =
750 container_of(work, struct iscsi_cls_session,
751 recovery_work.work);
6eabafbe 752 unsigned long flags;
30a6c652 753
322d739d
MC		 754 iscsi_cls_session_printk(KERN_INFO, session,
755 "session recovery timed out after %d secs\n",
756 session->recovery_tmo);
30a6c652 757
6eabafbe
MC		 758 spin_lock_irqsave(&session->lock, flags);
759 switch (session->state) {
760 case ISCSI_SESSION_FAILED:
761 session->state = ISCSI_SESSION_FREE;
762 break;
763 case ISCSI_SESSION_LOGGED_IN:
764 case ISCSI_SESSION_FREE:
765 /* we raced with the unblock's flush */
766 spin_unlock_irqrestore(&session->lock, flags);
767 return;
768 }
769 spin_unlock_irqrestore(&session->lock, flags);
770
30a6c652
MC		 771 if (session->transport->session_recovery_timedout)
772 session->transport->session_recovery_timedout(session);
773
632248aa 774 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
30a6c652 775 scsi_target_unblock(&session->dev);
632248aa 776 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 777}
778
45ab33b6 779static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 780{
45ab33b6
MC		 781 struct iscsi_cls_session *session =
782 container_of(work, struct iscsi_cls_session,
783 unblock_work);
bd976f62 784 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 785 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 786 unsigned long flags;
787
632248aa 788 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 789 /*
790 * The recovery and unblock work get run from the same workqueue,
791 * so try to cancel it if it was going to run after this unblock.
792 */
793 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 794 spin_lock_irqsave(&session->lock, flags);
795 session->state = ISCSI_SESSION_LOGGED_IN;
796 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 797 /* start IO */
798 scsi_target_unblock(&session->dev);
8aae18ad
MC		 799 /*
800 * Only do kernel scanning if the driver is properly hooked into
801 * the async scanning code (drivers like iscsi_tcp do login and
802 * scanning from userspace).
803 */
804 if (shost->hostt->scan_finished) {
06d25af4 805 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 806 atomic_inc(&ihost->nr_scans);
807 }
632248aa 808 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 809}
45ab33b6
MC		 810
811/**
812 * iscsi_unblock_session - set a session as logged in and start IO.
813 * @session: iscsi session
814 *
815 * Mark a session as ready to accept IO.
816 */
817void iscsi_unblock_session(struct iscsi_cls_session *session)
818{
819 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
820 /*
821 * make sure all the events have completed before tell the driver
822 * it is safe
823 */
824 flush_workqueue(iscsi_eh_timer_workq);
825}
30a6c652
MC		 826EXPORT_SYMBOL_GPL(iscsi_unblock_session);
827
45ab33b6 828static void __iscsi_block_session(struct work_struct *work)
30a6c652 829{
45ab33b6
MC		 830 struct iscsi_cls_session *session =
831 container_of(work, struct iscsi_cls_session,
832 block_work);
6eabafbe
MC		 833 unsigned long flags;
834
632248aa 835 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 836 spin_lock_irqsave(&session->lock, flags);
837 session->state = ISCSI_SESSION_FAILED;
838 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 839 scsi_target_block(&session->dev);
632248aa 840 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 841 if (session->recovery_tmo >= 0)
842 queue_delayed_work(iscsi_eh_timer_workq,
843 &session->recovery_work,
844 session->recovery_tmo * HZ);
30a6c652 845}
45ab33b6
MC		 846
847void iscsi_block_session(struct iscsi_cls_session *session)
848{
849 queue_work(iscsi_eh_timer_workq, &session->block_work);
850}
30a6c652
MC		 851EXPORT_SYMBOL_GPL(iscsi_block_session);
852
26974789
MC		 853static void __iscsi_unbind_session(struct work_struct *work)
854{
855 struct iscsi_cls_session *session =
856 container_of(work, struct iscsi_cls_session,
857 unbind_work);
858 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 859 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 860 unsigned long flags;
26974789 861
632248aa
MC		 862 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
863
26974789
MC		 864 /* Prevent new scans and make sure scanning is not in progress */
865 mutex_lock(&ihost->mutex);
7970634b
MC		 866 spin_lock_irqsave(&session->lock, flags);
867 if (session->target_id == ISCSI_MAX_TARGET) {
868 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 869 mutex_unlock(&ihost->mutex);
870 return;
871 }
7970634b
MC		 872 session->target_id = ISCSI_MAX_TARGET;
873 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 874 mutex_unlock(&ihost->mutex);
875
876 scsi_remove_target(&session->dev);
877 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 878 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 879}
880
7b8631b5 881struct iscsi_cls_session *
5d91e209
MC		 882iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
883 int dd_size)
7b8631b5
MC		 884{
885 struct iscsi_cls_session *session;
7b8631b5 886
5d91e209 887 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 888 GFP_KERNEL);
7b8631b5 889 if (!session)
f53a88da
MC		 890 return NULL;
891
7b8631b5 892 session->transport = transport;
30a6c652 893 session->recovery_tmo = 120;
6eabafbe 894 session->state = ISCSI_SESSION_FREE;
c4028958 895 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 896 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 897 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
898 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 899 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 900 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 901 spin_lock_init(&session->lock);
7b8631b5 902
6a8a0d36
MC		 903 /* this is released in the dev's release function */
904 scsi_host_get(shost);
8434aa8b
MC		 905 session->dev.parent = &shost->shost_gendev;
906 session->dev.release = iscsi_session_release;
907 device_initialize(&session->dev);
5d91e209 908 if (dd_size)
b5c7a12d 909 session->dd_data = &session[1];
632248aa
MC		 910
911 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 912 return session;
913}
914EXPORT_SYMBOL_GPL(iscsi_alloc_session);
915
7970634b
MC		 916static int iscsi_get_next_target_id(struct device *dev, void *data)
917{
918 struct iscsi_cls_session *session;
919 unsigned long flags;
920 int err = 0;
921
922 if (!iscsi_is_session_dev(dev))
923 return 0;
924
925 session = iscsi_dev_to_session(dev);
926 spin_lock_irqsave(&session->lock, flags);
927 if (*((unsigned int *) data) == session->target_id)
928 err = -EEXIST;
929 spin_unlock_irqrestore(&session->lock, flags);
930 return err;
931}
932
6a8a0d36 933int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 934{
935 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 936 struct iscsi_cls_host *ihost;
26974789 937 unsigned long flags;
7970634b 938 unsigned int id = target_id;
8434aa8b 939 int err;
b5c7a12d 940
30a6c652 941 ihost = shost->shost_data;
41be1444 942 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 943
944 if (id == ISCSI_MAX_TARGET) {
945 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
946 err = device_for_each_child(&shost->shost_gendev, &id,
947 iscsi_get_next_target_id);
948 if (!err)
949 break;
950 }
951
952 if (id == ISCSI_MAX_TARGET) {
953 iscsi_cls_session_printk(KERN_ERR, session,
954 "Too many iscsi targets. Max "
955 "number of targets is %d.\n",
956 ISCSI_MAX_TARGET - 1);
24add1c4 957 err = -EOVERFLOW;
7970634b
MC		 958 goto release_host;
959 }
960 }
961 session->target_id = id;
30a6c652 962
71610f55 963 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 964 err = device_add(&session->dev);
7b8631b5 965 if (err) {
322d739d
MC		 966 iscsi_cls_session_printk(KERN_ERR, session,
967 "could not register session's dev\n");
8434aa8b 968 goto release_host;
7b8631b5
MC		 969 }
970 transport_register_device(&session->dev);
971
26974789
MC		 972 spin_lock_irqsave(&sesslock, flags);
973 list_add(&session->sess_list, &sesslist);
974 spin_unlock_irqrestore(&sesslock, flags);
975
26974789 976 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 977 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 978 return 0;
30a6c652 979
8434aa8b
MC		 980release_host:
981 scsi_host_put(shost);
982 return err;
7b8631b5 983}
8434aa8b 984EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 985
986/**
8434aa8b
MC		 987 * iscsi_create_session - create iscsi class session
988 * @shost: scsi host
989 * @transport: iscsi transport
5d91e209 990 * @dd_size: private driver data size
eb44820c 991 * @target_id: which target
7b8631b5 992 *
8434aa8b 993 * This can be called from a LLD or iscsi_transport.
eb44820c 994 */
8434aa8b 995struct iscsi_cls_session *
5d91e209
MC		 996iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
997 int dd_size, unsigned int target_id)
8434aa8b
MC		 998{
999 struct iscsi_cls_session *session;
1000
5d91e209 1001 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 1002 if (!session)
1003 return NULL;
1004
6a8a0d36 1005 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1006 iscsi_free_session(session);
1007 return NULL;
1008 }
1009 return session;
1010}
1011EXPORT_SYMBOL_GPL(iscsi_create_session);
1012
26974789
MC		 1013static void iscsi_conn_release(struct device *dev)
1014{
1015 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1016 struct device *parent = conn->dev.parent;
1017
632248aa 1018 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1019 kfree(conn);
1020 put_device(parent);
1021}
1022
1023static int iscsi_is_conn_dev(const struct device *dev)
1024{
1025 return dev->release == iscsi_conn_release;
1026}
1027
1028static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1029{
1030 if (!iscsi_is_conn_dev(dev))
1031 return 0;
1032 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1033}
1034
8434aa8b 1035void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1036{
30a6c652 1037 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1038 unsigned long flags;
1039 int err;
1040
632248aa
MC		 1041 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1042
26974789
MC		 1043 spin_lock_irqsave(&sesslock, flags);
1044 list_del(&session->sess_list);
1045 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1046
45ab33b6
MC		 1047 /* make sure there are no blocks/unblocks queued */
1048 flush_workqueue(iscsi_eh_timer_workq);
1049 /* make sure the timedout callout is not running */
1050 if (!cancel_delayed_work(&session->recovery_work))
1051 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1052 /*
1053 * If we are blocked let commands flow again. The lld or iscsi
1054 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1055 * We assume that LLD will not be calling block/unblock while
1056 * removing the session.
26974789 1057 */
6eabafbe
MC		 1058 spin_lock_irqsave(&session->lock, flags);
1059 session->state = ISCSI_SESSION_FREE;
1060 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1061
45ab33b6
MC		 1062 scsi_target_unblock(&session->dev);
1063 /* flush running scans then delete devices */
06d25af4 1064 scsi_flush_work(shost);
45ab33b6 1065 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1066
26974789
MC		 1067 /* hw iscsi may not have removed all connections from session */
1068 err = device_for_each_child(&session->dev, NULL,
1069 iscsi_iter_destroy_conn_fn);
1070 if (err)
322d739d
MC		 1071 iscsi_cls_session_printk(KERN_ERR, session,
1072 "Could not delete all connections "
1073 "for session. Error %d.\n", err);
8434aa8b 1074
7b8631b5 1075 transport_unregister_device(&session->dev);
632248aa
MC		 1076
1077 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1078 device_del(&session->dev);
1079}
1080EXPORT_SYMBOL_GPL(iscsi_remove_session);
1081
1082void iscsi_free_session(struct iscsi_cls_session *session)
1083{
632248aa 1084 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1085 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1086 put_device(&session->dev);
7b8631b5 1087}
8434aa8b
MC		 1088EXPORT_SYMBOL_GPL(iscsi_free_session);
1089
1090/**
1091 * iscsi_destroy_session - destroy iscsi session
1092 * @session: iscsi_session
1093 *
1094 * Can be called by a LLD or iscsi_transport. There must not be
1095 * any running connections.
eb44820c 1096 */
8434aa8b
MC		 1097int iscsi_destroy_session(struct iscsi_cls_session *session)
1098{
1099 iscsi_remove_session(session);
632248aa 1100 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1101 iscsi_free_session(session);
1102 return 0;
1103}
7b8631b5
MC		 1104EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1105
7b8631b5
MC		 1106/**
1107 * iscsi_create_conn - create iscsi class connection
1108 * @session: iscsi cls session
5d91e209 1109 * @dd_size: private driver data size
7b8631b5
MC		 1110 * @cid: connection id
1111 *
1112 * This can be called from a LLD or iscsi_transport. The connection
1113 * is child of the session so cid must be unique for all connections
1114 * on the session.
b5c7a12d
MC		 1115 *
1116 * Since we do not support MCS, cid will normally be zero. In some cases
1117 * for software iscsi we could be trying to preallocate a connection struct
1118 * in which case there could be two connection structs and cid would be
1119 * non-zero.
eb44820c 1120 */
7b8631b5 1121struct iscsi_cls_conn *
5d91e209 1122iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1123{
1124 struct iscsi_transport *transport = session->transport;
7b8631b5 1125 struct iscsi_cls_conn *conn;
26974789 1126 unsigned long flags;
7b8631b5
MC		 1127 int err;
1128
5d91e209 1129 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1130 if (!conn)
1131 return NULL;
5d91e209 1132 if (dd_size)
7b8631b5
MC		 1133 conn->dd_data = &conn[1];
1134
22a39fbb 1135 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1136 INIT_LIST_HEAD(&conn->conn_list);
1137 conn->transport = transport;
b5c7a12d 1138 conn->cid = cid;
7b8631b5
MC		 1139
1140 /* this is released in the dev's release function */
1141 if (!get_device(&session->dev))
43a145a3 1142 goto free_conn;
b5c7a12d 1143
71610f55 1144 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1145 conn->dev.parent = &session->dev;
1146 conn->dev.release = iscsi_conn_release;
1147 err = device_register(&conn->dev);
1148 if (err) {
322d739d
MC		 1149 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1150 "register connection's dev\n");
7b8631b5
MC		 1151 goto release_parent_ref;
1152 }
1153 transport_register_device(&conn->dev);
26974789
MC		 1154
1155 spin_lock_irqsave(&connlock, flags);
1156 list_add(&conn->conn_list, &connlist);
26974789 1157 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1158
1159 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1160 return conn;
1161
1162release_parent_ref:
1163 put_device(&session->dev);
1164free_conn:
1165 kfree(conn);
1166 return NULL;
1167}
1168
1169EXPORT_SYMBOL_GPL(iscsi_create_conn);
1170
1171/**
1172 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1173 * @conn: iscsi cls session
7b8631b5 1174 *
26974789 1175 * This can be called from a LLD or iscsi_transport.
eb44820c 1176 */
7b8631b5
MC		 1177int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1178{
26974789
MC		 1179 unsigned long flags;
1180
1181 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1182 list_del(&conn->conn_list);
1183 spin_unlock_irqrestore(&connlock, flags);
1184
7b8631b5 1185 transport_unregister_device(&conn->dev);
632248aa 1186 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1187 device_unregister(&conn->dev);
1188 return 0;
1189}
7b8631b5
MC		 1190EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1191
7b8631b5
MC		 1192/*
1193 * iscsi interface functions
1194 */
0896b752
AA		 1195static struct iscsi_internal *
1196iscsi_if_transport_lookup(struct iscsi_transport *tt)
1197{
1198 struct iscsi_internal *priv;
1199 unsigned long flags;
1200
1201 spin_lock_irqsave(&iscsi_transport_lock, flags);
1202 list_for_each_entry(priv, &iscsi_transports, list) {
1203 if (tt == priv->iscsi_transport) {
1204 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1205 return priv;
1206 }
1207 }
1208 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1209 return NULL;
1210}
1da177e4 1211
53cb8a1f 1212static int
43514774 1213iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1214{
43514774 1215 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1216}
1da177e4 1217
7b7232f3 1218int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1219 char *data, uint32_t data_size)
1da177e4 1220{
0896b752
AA		 1221 struct nlmsghdr *nlh;
1222 struct sk_buff *skb;
1223 struct iscsi_uevent *ev;
0896b752 1224 char *pdu;
790f39a2 1225 struct iscsi_internal *priv;
0896b752
AA		 1226 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1227 data_size);
1228
790f39a2
MC		 1229 priv = iscsi_if_transport_lookup(conn->transport);
1230 if (!priv)
1231 return -EINVAL;
1232
43a145a3 1233 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1234 if (!skb) {
e5bd7b54 1235 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1236 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1237 "control PDU: OOM\n");
0896b752
AA		 1238 return -ENOMEM;
1239 }
1da177e4 1240
43514774 1241 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1242 ev = NLMSG_DATA(nlh);
1243 memset(ev, 0, sizeof(*ev));
1244 ev->transport_handle = iscsi_handle(conn->transport);
1245 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1246 ev->r.recv_req.cid = conn->cid;
1247 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1248 pdu = (char*)ev + sizeof(*ev);
1249 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1250 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1251
43514774 1252 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1253}
0896b752 1254EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1255
43514774
MC		 1256int iscsi_offload_mesg(struct Scsi_Host *shost,
1257 struct iscsi_transport *transport, uint32_t type,
1258 char *data, uint16_t data_size)
1259{
1260 struct nlmsghdr *nlh;
1261 struct sk_buff *skb;
1262 struct iscsi_uevent *ev;
1263 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1264
a541f840 1265 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1266 if (!skb) {
1267 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1268 return -ENOMEM;
1269 }
1270
1271 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1272 ev = NLMSG_DATA(nlh);
1273 memset(ev, 0, sizeof(*ev));
1274 ev->type = type;
1275 ev->transport_handle = iscsi_handle(transport);
1276 switch (type) {
1277 case ISCSI_KEVENT_PATH_REQ:
1278 ev->r.req_path.host_no = shost->host_no;
1279 break;
1280 case ISCSI_KEVENT_IF_DOWN:
1281 ev->r.notify_if_down.host_no = shost->host_no;
1282 break;
1283 }
1284
1285 memcpy((char *)ev + sizeof(*ev), data, data_size);
1286
a541f840 1287 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1288}
1289EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1290
e5bd7b54 1291void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1292{
0896b752
AA		 1293 struct nlmsghdr *nlh;
1294 struct sk_buff *skb;
1295 struct iscsi_uevent *ev;
790f39a2 1296 struct iscsi_internal *priv;
0896b752
AA		 1297 int len = NLMSG_SPACE(sizeof(*ev));
1298
790f39a2
MC		 1299 priv = iscsi_if_transport_lookup(conn->transport);
1300 if (!priv)
1301 return;
1302
43a145a3 1303 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1304 if (!skb) {
322d739d
MC		 1305 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1306 "conn error (%d)\n", error);
0896b752
AA		 1307 return;
1308 }
1309
43514774 1310 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1311 ev = NLMSG_DATA(nlh);
1312 ev->transport_handle = iscsi_handle(conn->transport);
1313 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1314 ev->r.connerror.error = error;
b5c7a12d
MC		 1315 ev->r.connerror.cid = conn->cid;
1316 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1317
43514774 1318 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1319
322d739d
MC		 1320 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1321 error);
0896b752 1322}
e5bd7b54 1323EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752
AA		 1324
1325static int
43514774
MC		 1326iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1327 void *payload, int size)
0896b752
AA		 1328{
1329 struct sk_buff *skb;
1330 struct nlmsghdr *nlh;
1331 int len = NLMSG_SPACE(size);
1332 int flags = multi ? NLM_F_MULTI : 0;
1333 int t = done ? NLMSG_DONE : type;
1334
43a145a3 1335 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1336 if (!skb) {
1337 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1338 return -ENOMEM;
1339 }
0896b752 1340
43514774 1341 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1342 nlh->nlmsg_flags = flags;
1343 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1344 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1345}
1da177e4 1346
7b8631b5 1347static int
5b940adf 1348iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1349{
1350 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1351 struct iscsi_stats *stats;
1352 struct sk_buff *skbstat;
1353 struct iscsi_cls_conn *conn;
1354 struct nlmsghdr *nlhstat;
1355 struct iscsi_uevent *evstat;
790f39a2 1356 struct iscsi_internal *priv;
7b8631b5
MC		 1357 int len = NLMSG_SPACE(sizeof(*ev) +
1358 sizeof(struct iscsi_stats) +
1359 sizeof(struct iscsi_stats_custom) *
1360 ISCSI_STATS_CUSTOM_MAX);
1361 int err = 0;
0896b752 1362
790f39a2
MC		 1363 priv = iscsi_if_transport_lookup(transport);
1364 if (!priv)
1365 return -EINVAL;
1366
b5c7a12d 1367 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1368 if (!conn)
1369 return -EEXIST;
0896b752 1370
7b8631b5
MC		 1371 do {
1372 int actual_size;
0896b752 1373
43a145a3 1374 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1375 if (!skbstat) {
322d739d
MC		 1376 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1377 "deliver stats: OOM\n");
7b8631b5
MC		 1378 return -ENOMEM;
1379 }
1380
43514774 1381 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1382 (len - sizeof(*nlhstat)), 0);
1383 evstat = NLMSG_DATA(nlhstat);
1384 memset(evstat, 0, sizeof(*evstat));
1385 evstat->transport_handle = iscsi_handle(conn->transport);
1386 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1387 evstat->u.get_stats.cid =
1388 ev->u.get_stats.cid;
1389 evstat->u.get_stats.sid =
1390 ev->u.get_stats.sid;
7b8631b5
MC		 1391 stats = (struct iscsi_stats *)
1392 ((char*)evstat + sizeof(*evstat));
1393 memset(stats, 0, sizeof(*stats));
1394
7b7232f3 1395 transport->get_stats(conn, stats);
7b8631b5
MC		 1396 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1397 sizeof(struct iscsi_stats) +
1398 sizeof(struct iscsi_stats_custom) *
1399 stats->custom_length);
1400 actual_size -= sizeof(*nlhstat);
1401 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1402 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1403 nlhstat->nlmsg_len = actual_size;
1404
43514774
MC		 1405 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1406 GFP_ATOMIC);
7b8631b5
MC		 1407 } while (err < 0 && err != -ECONNREFUSED);
1408
1409 return err;
0896b752
AA		 1410}
1411
53cb8a1f 1412/**
26974789
MC		 1413 * iscsi_session_event - send session destr. completion event
1414 * @session: iscsi class session
1415 * @event: type of event
eb44820c 1416 */
26974789
MC		 1417int iscsi_session_event(struct iscsi_cls_session *session,
1418 enum iscsi_uevent_e event)
53cb8a1f
MC		 1419{
1420 struct iscsi_internal *priv;
53cb8a1f
MC		 1421 struct Scsi_Host *shost;
1422 struct iscsi_uevent *ev;
1423 struct sk_buff *skb;
1424 struct nlmsghdr *nlh;
53cb8a1f
MC		 1425 int rc, len = NLMSG_SPACE(sizeof(*ev));
1426
26974789 1427 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1428 if (!priv)
1429 return -EINVAL;
53cb8a1f
MC		 1430 shost = iscsi_session_to_shost(session);
1431
43a145a3 1432 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1433 if (!skb) {
322d739d
MC		 1434 iscsi_cls_session_printk(KERN_ERR, session,
1435 "Cannot notify userspace of session "
1436 "event %u\n", event);
53cb8a1f
MC		 1437 return -ENOMEM;
1438 }
1439
43514774 1440 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1441 ev = NLMSG_DATA(nlh);
26974789 1442 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1443
26974789
MC		 1444 ev->type = event;
1445 switch (event) {
1446 case ISCSI_KEVENT_DESTROY_SESSION:
1447 ev->r.d_session.host_no = shost->host_no;
1448 ev->r.d_session.sid = session->sid;
1449 break;
1450 case ISCSI_KEVENT_CREATE_SESSION:
1451 ev->r.c_session_ret.host_no = shost->host_no;
1452 ev->r.c_session_ret.sid = session->sid;
1453 break;
1454 case ISCSI_KEVENT_UNBIND_SESSION:
1455 ev->r.unbind_session.host_no = shost->host_no;
1456 ev->r.unbind_session.sid = session->sid;
1457 break;
1458 default:
322d739d
MC		 1459 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1460 "%u.\n", event);
26974789 1461 kfree_skb(skb);
53cb8a1f 1462 return -EINVAL;
53cb8a1f
MC		 1463 }
1464
53cb8a1f
MC		 1465 /*
1466 * this will occur if the daemon is not up, so we just warn
1467 * the user and when the daemon is restarted it will handle it
1468 */
43514774 1469 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1470 if (rc == -ESRCH)
322d739d
MC		 1471 iscsi_cls_session_printk(KERN_ERR, session,
1472 "Cannot notify userspace of session "
1473 "event %u. Check iscsi daemon\n",
1474 event);
632248aa
MC		 1475
1476 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1477 event, rc);
53cb8a1f
MC		 1478 return rc;
1479}
26974789 1480EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1481
0896b752 1482static int
d82ff9be
MC		 1483iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1484 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1485 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1486{
1487 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1488 struct iscsi_cls_session *session;
5e7facb7 1489 struct Scsi_Host *shost;
0896b752 1490
d82ff9be 1491 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1492 initial_cmdsn);
7b7232f3 1493 if (!session)
7b8631b5 1494 return -ENOMEM;
0896b752 1495
5e7facb7
MC		 1496 shost = iscsi_session_to_shost(session);
1497 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1498 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1499 ISCSI_DBG_TRANS_SESSION(session,
1500 "Completed creating transport session\n");
0896b752 1501 return 0;
0896b752
AA		 1502}
1503
1504static int
7b7232f3 1505iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1506{
7b8631b5 1507 struct iscsi_cls_conn *conn;
7b7232f3 1508 struct iscsi_cls_session *session;
7b8631b5 1509
b5c7a12d
MC		 1510 session = iscsi_session_lookup(ev->u.c_conn.sid);
1511 if (!session) {
322d739d 1512 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1513 ev->u.c_conn.sid);
7b8631b5 1514 return -EINVAL;
b5c7a12d 1515 }
0896b752 1516
7b7232f3 1517 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1518 if (!conn) {
322d739d
MC		 1519 iscsi_cls_session_printk(KERN_ERR, session,
1520 "couldn't create a new connection.");
7b7232f3 1521 return -ENOMEM;
b5c7a12d 1522 }
0896b752 1523
b5c7a12d
MC		 1524 ev->r.c_conn_ret.sid = session->sid;
1525 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1526
1527 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1528 return 0;
1da177e4
LT		 1529}
1530
0896b752
AA		 1531static int
1532iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1533{
7b8631b5 1534 struct iscsi_cls_conn *conn;
0896b752 1535
b5c7a12d 1536 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1537 if (!conn)
7b8631b5 1538 return -EINVAL;
0896b752 1539
632248aa 1540 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1541 if (transport->destroy_conn)
1542 transport->destroy_conn(conn);
632248aa 1543
7b8631b5 1544 return 0;
0896b752
AA		 1545}
1546
fd7255f5
MC		 1547static int
1548iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1549{
1550 char *data = (char*)ev + sizeof(*ev);
1551 struct iscsi_cls_conn *conn;
1552 struct iscsi_cls_session *session;
a54a52ca 1553 int err = 0, value = 0;
fd7255f5
MC		 1554
1555 session = iscsi_session_lookup(ev->u.set_param.sid);
1556 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1557 if (!conn || !session)
1558 return -EINVAL;
1559
1560 switch (ev->u.set_param.param) {
30a6c652 1561 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1562 sscanf(data, "%d", &value);
fdd46dcb 1563 session->recovery_tmo = value;
30a6c652 1564 break;
fd7255f5 1565 default:
a54a52ca
MC		 1566 err = transport->set_param(conn, ev->u.set_param.param,
1567 data, ev->u.set_param.len);
fd7255f5
MC		 1568 }
1569
1570 return err;
1571}
1572
10eb0f01
MC		 1573static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1574 struct iscsi_uevent *ev, int msg_type)
1575{
1576 struct iscsi_endpoint *ep;
1577 struct sockaddr *dst_addr;
1578 struct Scsi_Host *shost = NULL;
1579 int non_blocking, err = 0;
1580
1581 if (!transport->ep_connect)
1582 return -EINVAL;
1583
1584 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1585 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1586 if (!shost) {
1587 printk(KERN_ERR "ep connect failed. Could not find "
1588 "host no %u\n",
1589 ev->u.ep_connect_through_host.host_no);
1590 return -ENODEV;
1591 }
1592 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1593 } else
1594 non_blocking = ev->u.ep_connect.non_blocking;
1595
1596 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1597 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1598 if (IS_ERR(ep)) {
1599 err = PTR_ERR(ep);
1600 goto release_host;
1601 }
1602
1603 ev->r.ep_connect_ret.handle = ep->id;
1604release_host:
1605 if (shost)
1606 scsi_host_put(shost);
1607 return err;
1608}
1609
22a39fbb
MC		 1610static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1611 u64 ep_handle)
1612{
1613 struct iscsi_cls_conn *conn;
1614 struct iscsi_endpoint *ep;
1615
1616 if (!transport->ep_disconnect)
1617 return -EINVAL;
1618
1619 ep = iscsi_lookup_endpoint(ep_handle);
1620 if (!ep)
1621 return -EINVAL;
1622 conn = ep->conn;
1623 if (conn) {
1624 mutex_lock(&conn->ep_mutex);
1625 conn->ep = NULL;
1626 mutex_unlock(&conn->ep_mutex);
1627 }
1628
1629 transport->ep_disconnect(ep);
1630 return 0;
1631}
1632
264faaaa
OG		 1633static int
1634iscsi_if_transport_ep(struct iscsi_transport *transport,
1635 struct iscsi_uevent *ev, int msg_type)
1636{
d82ff9be 1637 struct iscsi_endpoint *ep;
264faaaa
OG		 1638 int rc = 0;
1639
1640 switch (msg_type) {
10eb0f01 1641 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1642 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1643 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1644 break;
1645 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1646 if (!transport->ep_poll)
1647 return -EINVAL;
1648
d82ff9be
MC		 1649 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1650 if (!ep)
1651 return -EINVAL;
1652
1653 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1654 ev->u.ep_poll.timeout_ms);
1655 break;
1656 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1657 rc = iscsi_if_ep_disconnect(transport,
1658 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1659 break;
1660 }
1661 return rc;
1662}
1663
01cb225d
MC		 1664static int
1665iscsi_tgt_dscvr(struct iscsi_transport *transport,
1666 struct iscsi_uevent *ev)
1667{
2174a04e 1668 struct Scsi_Host *shost;
01cb225d 1669 struct sockaddr *dst_addr;
2174a04e 1670 int err;
01cb225d
MC		 1671
1672 if (!transport->tgt_dscvr)
1673 return -EINVAL;
1674
2174a04e 1675 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1676 if (!shost) {
2174a04e
MC		 1677 printk(KERN_ERR "target discovery could not find host no %u\n",
1678 ev->u.tgt_dscvr.host_no);
1679 return -ENODEV;
1680 }
1681
1682
01cb225d 1683 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1684 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1685 ev->u.tgt_dscvr.enable, dst_addr);
1686 scsi_host_put(shost);
1687 return err;
01cb225d
MC		 1688}
1689
1d9bf13a
MC		 1690static int
1691iscsi_set_host_param(struct iscsi_transport *transport,
1692 struct iscsi_uevent *ev)
1693{
1694 char *data = (char*)ev + sizeof(*ev);
1695 struct Scsi_Host *shost;
1696 int err;
1697
1698 if (!transport->set_host_param)
1699 return -ENOSYS;
1700
1701 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1702 if (!shost) {
1d9bf13a
MC		 1703 printk(KERN_ERR "set_host_param could not find host no %u\n",
1704 ev->u.set_host_param.host_no);
1705 return -ENODEV;
1706 }
1707
1708 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1709 data, ev->u.set_host_param.len);
1710 scsi_host_put(shost);
1711 return err;
1712}
1713
0896b752 1714static int
43514774
MC		 1715iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1716{
1717 struct Scsi_Host *shost;
1718 struct iscsi_path *params;
1719 int err;
1720
1721 if (!transport->set_path)
1722 return -ENOSYS;
1723
1724 shost = scsi_host_lookup(ev->u.set_path.host_no);
1725 if (!shost) {
1726 printk(KERN_ERR "set path could not find host no %u\n",
1727 ev->u.set_path.host_no);
1728 return -ENODEV;
1729 }
1730
1731 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1732 err = transport->set_path(shost, params);
1733
1734 scsi_host_put(shost);
1735 return err;
1736}
1737
56c155b5
MC		 1738static int
1739iscsi_set_iface_params(struct iscsi_transport *transport,
1740 struct iscsi_uevent *ev)
1741{
1742 char *data = (char *)ev + sizeof(*ev);
1743 struct Scsi_Host *shost;
1744 int err;
1745
1746 if (!transport->set_iface_param)
1747 return -ENOSYS;
1748
1749 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1750 if (!shost) {
1751 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1752 ev->u.set_iface_params.host_no);
1753 return -ENODEV;
1754 }
1755
1756 err = transport->set_iface_param(shost, data,
1757 ev->u.set_iface_params.count);
1758 scsi_host_put(shost);
1759 return err;
1760}
1761
43514774
MC		 1762static int
1763iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 1764{
1765 int err = 0;
1766 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1767 struct iscsi_transport *transport = NULL;
1768 struct iscsi_internal *priv;
7b7232f3
MC		 1769 struct iscsi_cls_session *session;
1770 struct iscsi_cls_conn *conn;
d82ff9be 1771 struct iscsi_endpoint *ep = NULL;
0896b752 1772
43514774
MC		 1773 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1774 *group = ISCSI_NL_GRP_UIP;
1775 else
1776 *group = ISCSI_NL_GRP_ISCSID;
1777
0896b752
AA		 1778 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1779 if (!priv)
1780 return -EINVAL;
1781 transport = priv->iscsi_transport;
1782
7b7232f3
MC		 1783 if (!try_module_get(transport->owner))
1784 return -EINVAL;
1785
0896b752
AA		 1786 switch (nlh->nlmsg_type) {
1787 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1788 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1789 ev->u.c_session.initial_cmdsn,
1790 ev->u.c_session.cmds_max,
1791 ev->u.c_session.queue_depth);
1792 break;
1793 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1794 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1795 if (!ep) {
1796 err = -EINVAL;
1797 break;
1798 }
d82ff9be
MC		 1799
1800 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1801 ev->u.c_bound_session.initial_cmdsn,
1802 ev->u.c_bound_session.cmds_max,
1803 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1804 break;
1805 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1806 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1807 if (session)
7b7232f3 1808 transport->destroy_session(session);
26974789
MC		 1809 else
1810 err = -EINVAL;
1811 break;
1812 case ISCSI_UEVENT_UNBIND_SESSION:
1813 session = iscsi_session_lookup(ev->u.d_session.sid);
1814 if (session)
06d25af4
MC		 1815 scsi_queue_work(iscsi_session_to_shost(session),
1816 &session->unbind_work);
26974789 1817 else
7b7232f3 1818 err = -EINVAL;
0896b752
AA		 1819 break;
1820 case ISCSI_UEVENT_CREATE_CONN:
1821 err = iscsi_if_create_conn(transport, ev);
1822 break;
1823 case ISCSI_UEVENT_DESTROY_CONN:
1824 err = iscsi_if_destroy_conn(transport, ev);
1825 break;
1826 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1827 session = iscsi_session_lookup(ev->u.b_conn.sid);
1828 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 1829
22a39fbb
MC		 1830 if (conn && conn->ep)
1831 iscsi_if_ep_disconnect(transport, conn->ep->id);
1832
1833 if (!session || !conn) {
7b7232f3 1834 err = -EINVAL;
22a39fbb
MC		 1835 break;
1836 }
1837
1838 ev->r.retcode = transport->bind_conn(session, conn,
1839 ev->u.b_conn.transport_eph,
1840 ev->u.b_conn.is_leading);
1841 if (ev->r.retcode || !transport->ep_connect)
1842 break;
1843
1844 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1845 if (ep) {
1846 ep->conn = conn;
1847
1848 mutex_lock(&conn->ep_mutex);
1849 conn->ep = ep;
1850 mutex_unlock(&conn->ep_mutex);
1851 } else
1852 iscsi_cls_conn_printk(KERN_ERR, conn,
1853 "Could not set ep conn "
1854 "binding\n");
0896b752
AA		 1855 break;
1856 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 1857 err = iscsi_set_param(transport, ev);
0896b752
AA		 1858 break;
1859 case ISCSI_UEVENT_START_CONN:
b5c7a12d 1860 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 1861 if (conn)
1862 ev->r.retcode = transport->start_conn(conn);
1863 else
1864 err = -EINVAL;
0896b752
AA		 1865 break;
1866 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 1867 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 1868 if (conn)
1869 transport->stop_conn(conn, ev->u.stop_conn.flag);
1870 else
1871 err = -EINVAL;
0896b752
AA		 1872 break;
1873 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 1874 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 1875 if (conn)
1876 ev->r.retcode = transport->send_pdu(conn,
1877 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1878 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1879 ev->u.send_pdu.data_size);
1880 else
1881 err = -EINVAL;
0896b752
AA		 1882 break;
1883 case ISCSI_UEVENT_GET_STATS:
5b940adf 1884 err = iscsi_if_get_stats(transport, nlh);
0896b752 1885 break;
264faaaa
OG		 1886 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1887 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1888 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 1889 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 1890 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1891 break;
01cb225d
MC		 1892 case ISCSI_UEVENT_TGT_DSCVR:
1893 err = iscsi_tgt_dscvr(transport, ev);
1894 break;
1d9bf13a
MC		 1895 case ISCSI_UEVENT_SET_HOST_PARAM:
1896 err = iscsi_set_host_param(transport, ev);
1897 break;
43514774
MC		 1898 case ISCSI_UEVENT_PATH_UPDATE:
1899 err = iscsi_set_path(transport, ev);
1900 break;
56c155b5
MC		 1901 case ISCSI_UEVENT_SET_IFACE_PARAMS:
1902 err = iscsi_set_iface_params(transport, ev);
1903 break;
0896b752 1904 default:
1d9bf13a 1905 err = -ENOSYS;
0896b752
AA		 1906 break;
1907 }
1908
7b7232f3 1909 module_put(transport->owner);
0896b752
AA		 1910 return err;
1911}
1912
b5c7a12d 1913/*
cd40b7d3
DL		 1914 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1915 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 1916 */
0896b752 1917static void
cd40b7d3 1918iscsi_if_rx(struct sk_buff *skb)
0896b752 1919{
0b950672 1920 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 1921 while (skb->len >= NLMSG_SPACE(0)) {
1922 int err;
1923 uint32_t rlen;
1924 struct nlmsghdr *nlh;
1925 struct iscsi_uevent *ev;
43514774 1926 uint32_t group;
cd40b7d3
DL		 1927
1928 nlh = nlmsg_hdr(skb);
1929 if (nlh->nlmsg_len < sizeof(*nlh) ||
1930 skb->len < nlh->nlmsg_len) {
1931 break;
ee7f8e40 1932 }
ee7f8e40 1933
cd40b7d3
DL		 1934 ev = NLMSG_DATA(nlh);
1935 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1936 if (rlen > skb->len)
1937 rlen = skb->len;
0896b752 1938
43514774 1939 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 1940 if (err) {
1941 ev->type = ISCSI_KEVENT_IF_ERROR;
1942 ev->iferror = err;
0896b752 1943 }
cd40b7d3
DL		 1944 do {
1945 /*
1946 * special case for GET_STATS:
1947 * on success - sending reply and stats from
1948 * inside of if_recv_msg(),
1949 * on error - fall through.
1950 */
1951 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1952 break;
43514774 1953 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3
DL		 1954 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1955 } while (err < 0 && err != -ECONNREFUSED);
1956 skb_pull(skb, rlen);
0896b752 1957 }
0b950672 1958 mutex_unlock(&rx_queue_mutex);
0896b752 1959}
1da177e4 1960
fd7255f5 1961#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 1962struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 1963 __ATTR(_name,_mode,_show,_store)
1964
1da177e4 1965/*
0896b752 1966 * iSCSI connection attrs
1da177e4 1967 */
a54a52ca 1968#define iscsi_conn_attr_show(param) \
0896b752 1969static ssize_t \
ee959b00
TJ		 1970show_conn_param_##param(struct device *dev, \
1971 struct device_attribute *attr, char *buf) \
0896b752 1972{ \
ee959b00 1973 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 1974 struct iscsi_transport *t = conn->transport; \
a54a52ca 1975 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 1976}
1977
a54a52ca
MC		 1978#define iscsi_conn_attr(field, param) \
1979 iscsi_conn_attr_show(param) \
1980static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 1981 NULL);
0896b752 1982
a54a52ca
MC		 1983iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1984iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1985iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1986iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1987iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1988iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1989iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 1990iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1991iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 1992iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1993iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 1994
289324b0
MC		 1995#define iscsi_conn_ep_attr_show(param) \
1996static ssize_t show_conn_ep_param_##param(struct device *dev, \
1997 struct device_attribute *attr,\
1998 char *buf) \
1999{ \
2000 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2001 struct iscsi_transport *t = conn->transport; \
2002 struct iscsi_endpoint *ep; \
2003 ssize_t rc; \
2004 \
2005 /* \
2006 * Need to make sure ep_disconnect does not free the LLD's \
2007 * interconnect resources while we are trying to read them. \
2008 */ \
2009 mutex_lock(&conn->ep_mutex); \
2010 ep = conn->ep; \
2011 if (!ep && t->ep_connect) { \
2012 mutex_unlock(&conn->ep_mutex); \
2013 return -ENOTCONN; \
2014 } \
2015 \
2016 if (ep) \
2017 rc = t->get_ep_param(ep, param, buf); \
2018 else \
2019 rc = t->get_conn_param(conn, param, buf); \
2020 mutex_unlock(&conn->ep_mutex); \
2021 return rc; \
2022}
2023
2024#define iscsi_conn_ep_attr(field, param) \
2025 iscsi_conn_ep_attr_show(param) \
2026static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2027 show_conn_ep_param_##param, NULL);
2028
2029iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2030iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2031
3128c6c7
MC		 2032static struct attribute *iscsi_conn_attrs[] = {
2033 &dev_attr_conn_max_recv_dlength.attr,
2034 &dev_attr_conn_max_xmit_dlength.attr,
2035 &dev_attr_conn_header_digest.attr,
2036 &dev_attr_conn_data_digest.attr,
2037 &dev_attr_conn_ifmarker.attr,
2038 &dev_attr_conn_ofmarker.attr,
2039 &dev_attr_conn_address.attr,
2040 &dev_attr_conn_port.attr,
2041 &dev_attr_conn_exp_statsn.attr,
2042 &dev_attr_conn_persistent_address.attr,
2043 &dev_attr_conn_persistent_port.attr,
2044 &dev_attr_conn_ping_tmo.attr,
2045 &dev_attr_conn_recv_tmo.attr,
2046 NULL,
2047};
2048
2049static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2050 struct attribute *attr, int i)
2051{
2052 struct device *cdev = container_of(kobj, struct device, kobj);
2053 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2054 struct iscsi_transport *t = conn->transport;
2055 int param;
2056
2057 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2058 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2059 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2060 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2061 else if (attr == &dev_attr_conn_header_digest.attr)
2062 param = ISCSI_PARAM_HDRDGST_EN;
2063 else if (attr == &dev_attr_conn_data_digest.attr)
2064 param = ISCSI_PARAM_DATADGST_EN;
2065 else if (attr == &dev_attr_conn_ifmarker.attr)
2066 param = ISCSI_PARAM_IFMARKER_EN;
2067 else if (attr == &dev_attr_conn_ofmarker.attr)
2068 param = ISCSI_PARAM_OFMARKER_EN;
2069 else if (attr == &dev_attr_conn_address.attr)
2070 param = ISCSI_PARAM_CONN_ADDRESS;
2071 else if (attr == &dev_attr_conn_port.attr)
2072 param = ISCSI_PARAM_CONN_PORT;
2073 else if (attr == &dev_attr_conn_exp_statsn.attr)
2074 param = ISCSI_PARAM_EXP_STATSN;
2075 else if (attr == &dev_attr_conn_persistent_address.attr)
2076 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2077 else if (attr == &dev_attr_conn_persistent_port.attr)
2078 param = ISCSI_PARAM_PERSISTENT_PORT;
2079 else if (attr == &dev_attr_conn_ping_tmo.attr)
2080 param = ISCSI_PARAM_PING_TMO;
2081 else if (attr == &dev_attr_conn_recv_tmo.attr)
2082 param = ISCSI_PARAM_RECV_TMO;
2083 else {
2084 WARN_ONCE(1, "Invalid conn attr");
2085 return 0;
2086 }
2087
2088 return t->attr_is_visible(ISCSI_PARAM, param);
2089}
2090
2091static struct attribute_group iscsi_conn_group = {
2092 .attrs = iscsi_conn_attrs,
2093 .is_visible = iscsi_conn_attr_is_visible,
2094};
2095
1da177e4 2096/*
0896b752 2097 * iSCSI session attrs
1da177e4 2098 */
b2c64167 2099#define iscsi_session_attr_show(param, perm) \
fd7255f5 2100static ssize_t \
ee959b00
TJ		 2101show_session_param_##param(struct device *dev, \
2102 struct device_attribute *attr, char *buf) \
fd7255f5 2103{ \
ee959b00
TJ		 2104 struct iscsi_cls_session *session = \
2105 iscsi_dev_to_session(dev->parent); \
fd7255f5 2106 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2107 \
2108 if (perm && !capable(CAP_SYS_ADMIN)) \
2109 return -EACCES; \
a54a52ca 2110 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2111}
2112
b2c64167
MC		 2113#define iscsi_session_attr(field, param, perm) \
2114 iscsi_session_attr_show(param, perm) \
a54a52ca 2115static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5
MC		 2116 NULL);
2117
b2c64167
MC		 2118iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2119iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2120iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2121iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2122iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2123iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2124iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2125iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2126iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2127iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2128iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2129iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2130iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2131iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 2132iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2133iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2134iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2135iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2136iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2137iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2138iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2139
6eabafbe 2140static ssize_t
ee959b00
TJ		 2141show_priv_session_state(struct device *dev, struct device_attribute *attr,
2142 char *buf)
6eabafbe 2143{
ee959b00 2144 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2145 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2146}
2147static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2148 NULL);
2149
fd7255f5
MC		 2150#define iscsi_priv_session_attr_show(field, format) \
2151static ssize_t \
ee959b00
TJ		 2152show_priv_session_##field(struct device *dev, \
2153 struct device_attribute *attr, char *buf) \
fd7255f5 2154{ \
ee959b00
TJ		 2155 struct iscsi_cls_session *session = \
2156 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2157 if (session->field == -1) \
2158 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2159 return sprintf(buf, format"\n", session->field); \
2160}
2161
fe4f0bde
VC		 2162#define iscsi_priv_session_attr_store(field) \
2163static ssize_t \
2164store_priv_session_##field(struct device *dev, \
2165 struct device_attribute *attr, \
2166 const char *buf, size_t count) \
2167{ \
2168 int val; \
2169 char *cp; \
2170 struct iscsi_cls_session *session = \
2171 iscsi_dev_to_session(dev->parent); \
2172 if ((session->state == ISCSI_SESSION_FREE) || \
2173 (session->state == ISCSI_SESSION_FAILED)) \
2174 return -EBUSY; \
2175 if (strncmp(buf, "off", 3) == 0) \
2176 session->field = -1; \
2177 else { \
2178 val = simple_strtoul(buf, &cp, 0); \
2179 if (*cp != '\0' && *cp != '\n') \
2180 return -EINVAL; \
2181 session->field = val; \
2182 } \
2183 return count; \
2184}
2185
2186#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2187 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2188 iscsi_priv_session_attr_store(field) \
523f3c80 2189static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2190 show_priv_session_##field, \
2191 store_priv_session_##field)
2192iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2193
1819dc81
MC		 2194/*
2195 * iSCSI host attrs
2196 */
2197#define iscsi_host_attr_show(param) \
2198static ssize_t \
ee959b00
TJ		 2199show_host_param_##param(struct device *dev, \
2200 struct device_attribute *attr, char *buf) \
1819dc81 2201{ \
ee959b00 2202 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2203 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2204 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2205}
2206
2207#define iscsi_host_attr(field, param) \
2208 iscsi_host_attr_show(param) \
2209static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2210 NULL);
2211
d8196ed2 2212iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2213iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2214iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2215iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 2216
fd7255f5
MC		 2217#define SETUP_PRIV_SESSION_RD_ATTR(field) \
2218do { \
ee959b00 2219 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
fd7255f5
MC		 2220 count++; \
2221} while (0)
2222
fe4f0bde
VC		 2223#define SETUP_PRIV_SESSION_RW_ATTR(field) \
2224do { \
2225 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
2226 count++; \
2227} while (0)
a54a52ca 2228
fd7255f5
MC		 2229#define SETUP_SESSION_RD_ATTR(field, param_flag) \
2230do { \
2231 if (tt->param_mask & param_flag) { \
ee959b00 2232 priv->session_attrs[count] = &dev_attr_sess_##field; \
1da177e4 2233 count++; \
fd7255f5
MC		 2234 } \
2235} while (0)
2236
1819dc81
MC		 2237#define SETUP_HOST_RD_ATTR(field, param_flag) \
2238do { \
2239 if (tt->host_param_mask & param_flag) { \
ee959b00 2240 priv->host_attrs[count] = &dev_attr_host_##field; \
1819dc81
MC		 2241 count++; \
2242 } \
2243} while (0)
2244
0896b752
AA		 2245static int iscsi_session_match(struct attribute_container *cont,
2246 struct device *dev)
1da177e4 2247{
7b8631b5 2248 struct iscsi_cls_session *session;
1da177e4 2249 struct Scsi_Host *shost;
0896b752
AA		 2250 struct iscsi_internal *priv;
2251
2252 if (!iscsi_is_session_dev(dev))
2253 return 0;
1da177e4 2254
7b8631b5
MC		 2255 session = iscsi_dev_to_session(dev);
2256 shost = iscsi_session_to_shost(session);
0896b752 2257 if (!shost->transportt)
1da177e4
LT		 2258 return 0;
2259
0896b752
AA		 2260 priv = to_iscsi_internal(shost->transportt);
2261 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2262 return 0;
2263
0896b752 2264 return &priv->session_cont.ac == cont;
1da177e4
LT		 2265}
2266
0896b752
AA		 2267static int iscsi_conn_match(struct attribute_container *cont,
2268 struct device *dev)
2269{
7b8631b5
MC		 2270 struct iscsi_cls_session *session;
2271 struct iscsi_cls_conn *conn;
1da177e4 2272 struct Scsi_Host *shost;
0896b752 2273 struct iscsi_internal *priv;
1da177e4 2274
0896b752 2275 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2276 return 0;
2277
7b8631b5
MC		 2278 conn = iscsi_dev_to_conn(dev);
2279 session = iscsi_dev_to_session(conn->dev.parent);
2280 shost = iscsi_session_to_shost(session);
2281
0896b752 2282 if (!shost->transportt)
1da177e4
LT		 2283 return 0;
2284
0896b752
AA		 2285 priv = to_iscsi_internal(shost->transportt);
2286 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2287 return 0;
1da177e4 2288
0896b752
AA		 2289 return &priv->conn_cont.ac == cont;
2290}
2291
30a6c652
MC		 2292static int iscsi_host_match(struct attribute_container *cont,
2293 struct device *dev)
2294{
2295 struct Scsi_Host *shost;
2296 struct iscsi_internal *priv;
2297
2298 if (!scsi_is_host_device(dev))
2299 return 0;
2300
2301 shost = dev_to_shost(dev);
2302 if (!shost->transportt ||
2303 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2304 return 0;
2305
2306 priv = to_iscsi_internal(shost->transportt);
2307 return &priv->t.host_attrs.ac == cont;
2308}
2309
7b8631b5
MC		 2310struct scsi_transport_template *
2311iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2312{
2313 struct iscsi_internal *priv;
2314 unsigned long flags;
2315 int count = 0, err;
2316
2317 BUG_ON(!tt);
2318
2319 priv = iscsi_if_transport_lookup(tt);
2320 if (priv)
7b8631b5 2321 return NULL;
0896b752 2322
24669f75 2323 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2324 if (!priv)
7b8631b5 2325 return NULL;
0896b752 2326 INIT_LIST_HEAD(&priv->list);
0896b752 2327 priv->iscsi_transport = tt;
30a6c652 2328 priv->t.user_scan = iscsi_user_scan;
06d25af4 2329 priv->t.create_work_queue = 1;
0896b752 2330
ee959b00 2331 priv->dev.class = &iscsi_transport_class;
71610f55 2332 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2333 err = device_register(&priv->dev);
0896b752
AA		 2334 if (err)
2335 goto free_priv;
2336
ee959b00 2337 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2338 if (err)
ee959b00 2339 goto unregister_dev;
0896b752 2340
30a6c652
MC		 2341 /* host parameters */
2342 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2343 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2344 priv->t.host_attrs.ac.match = iscsi_host_match;
32c6e1b9 2345 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2346 transport_container_register(&priv->t.host_attrs);
2347
d8196ed2 2348 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
22236961 2349 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1819dc81 2350 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
8ad5781a 2351 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1819dc81
MC		 2352 BUG_ON(count > ISCSI_HOST_ATTRS);
2353 priv->host_attrs[count] = NULL;
2354 count = 0;
2355
0896b752 2356 /* connection parameters */
0896b752
AA		 2357 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2358 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2359 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2360 transport_container_register(&priv->conn_cont);
1da177e4 2361
0896b752
AA		 2362 /* session parameters */
2363 priv->session_cont.ac.attrs = &priv->session_attrs[0];
2364 priv->session_cont.ac.class = &iscsi_session_class.class;
2365 priv->session_cont.ac.match = iscsi_session_match;
2366 transport_container_register(&priv->session_cont);
2367
fd7255f5
MC		 2368 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
2369 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
2370 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
2371 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
2372 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
2373 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
2374 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
2375 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
a54a52ca
MC		 2376 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
2377 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
b2c64167
MC		 2378 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2379 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2380 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2381 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
843c0a8a 2382 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
4cd49ea1
MC		 2383 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2384 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
3fe5ae8b 2385 SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
88dfd340
MC		 2386 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2387 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
3b2bef1f 2388 SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
fe4f0bde 2389 SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
6eabafbe 2390 SETUP_PRIV_SESSION_RD_ATTR(state);
fd7255f5 2391
0896b752
AA		 2392 BUG_ON(count > ISCSI_SESSION_ATTRS);
2393 priv->session_attrs[count] = NULL;
8d07913d 2394 count = 0;
0896b752
AA		 2395
2396 spin_lock_irqsave(&iscsi_transport_lock, flags);
2397 list_add(&priv->list, &iscsi_transports);
2398 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2399
2400 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2401 return &priv->t;
1da177e4 2402
ee959b00
TJ		 2403unregister_dev:
2404 device_unregister(&priv->dev);
d82ff9be 2405 return NULL;
0896b752
AA		 2406free_priv:
2407 kfree(priv);
7b8631b5 2408 return NULL;
1da177e4 2409}
0896b752
AA		 2410EXPORT_SYMBOL_GPL(iscsi_register_transport);
2411
2412int iscsi_unregister_transport(struct iscsi_transport *tt)
2413{
2414 struct iscsi_internal *priv;
2415 unsigned long flags;
2416
2417 BUG_ON(!tt);
2418
0b950672 2419 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2420
2421 priv = iscsi_if_transport_lookup(tt);
2422 BUG_ON (!priv);
2423
0896b752
AA		 2424 spin_lock_irqsave(&iscsi_transport_lock, flags);
2425 list_del(&priv->list);
2426 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2427
2428 transport_container_unregister(&priv->conn_cont);
2429 transport_container_unregister(&priv->session_cont);
30a6c652 2430 transport_container_unregister(&priv->t.host_attrs);
0896b752 2431
ee959b00
TJ		 2432 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2433 device_unregister(&priv->dev);
0b950672 2434 mutex_unlock(&rx_queue_mutex);
1da177e4 2435
0896b752
AA		 2436 return 0;
2437}
2438EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2439
1da177e4
LT		 2440static __init int iscsi_transport_init(void)
2441{
0896b752 2442 int err;
1da177e4 2443
09492605 2444 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2445 ISCSI_TRANSPORT_VERSION);
2446
41be1444
MC		 2447 atomic_set(&iscsi_session_nr, 0);
2448
0896b752 2449 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2450 if (err)
2451 return err;
0896b752 2452
d82ff9be 2453 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2454 if (err)
2455 goto unregister_transport_class;
2456
8d07913d 2457 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2458 if (err)
2459 goto unregister_endpoint_class;
2460
8d07913d
MC		 2461 err = transport_class_register(&iscsi_host_class);
2462 if (err)
2463 goto unregister_iface_class;
2464
30a6c652
MC		 2465 err = transport_class_register(&iscsi_connection_class);
2466 if (err)
2467 goto unregister_host_class;
2468
0896b752
AA		 2469 err = transport_class_register(&iscsi_session_class);
2470 if (err)
2471 goto unregister_conn_class;
2472
d82ff9be
MC		 2473 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2474 NULL, THIS_MODULE);
0896b752
AA		 2475 if (!nls) {
2476 err = -ENOBUFS;
43a145a3 2477 goto unregister_session_class;
0896b752
AA		 2478 }
2479
d8bf541e
MC		 2480 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2481 if (!iscsi_eh_timer_workq)
2482 goto release_nls;
2483
43a145a3 2484 return 0;
0896b752 2485
d8bf541e 2486release_nls:
b7c6ba6e 2487 netlink_kernel_release(nls);
0896b752
AA		 2488unregister_session_class:
2489 transport_class_unregister(&iscsi_session_class);
2490unregister_conn_class:
2491 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2492unregister_host_class:
2493 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2494unregister_iface_class:
2495 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2496unregister_endpoint_class:
2497 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2498unregister_transport_class:
2499 class_unregister(&iscsi_transport_class);
2500 return err;
1da177e4
LT		 2501}
2502
2503static void __exit iscsi_transport_exit(void)
2504{
d8bf541e 2505 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2506 netlink_kernel_release(nls);
0896b752
AA		 2507 transport_class_unregister(&iscsi_connection_class);
2508 transport_class_unregister(&iscsi_session_class);
30a6c652 2509 transport_class_unregister(&iscsi_host_class);
d82ff9be 2510 class_unregister(&iscsi_endpoint_class);
8d07913d 2511 class_unregister(&iscsi_iface_class);
0896b752 2512 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2513}
2514
2515module_init(iscsi_transport_init);
2516module_exit(iscsi_transport_exit);
2517
0896b752
AA		 2518MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2519 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2520 "Alex Aizman <itn780@yahoo.com>");
2521MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2522MODULE_LICENSE("GPL");
f4246b33 2523MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 2524MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
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