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[SCSI] qla4xxx: Boot from SAN support for open-iscsi
[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>
90eeb01a 26#include <linux/bsg-lib.h>
0896b752 27#include <net/tcp.h>
1da177e4
LT		 28#include <scsi/scsi.h>
29#include <scsi/scsi_host.h>
30#include <scsi/scsi_device.h>
31#include <scsi/scsi_transport.h>
32#include <scsi/scsi_transport_iscsi.h>
0896b752 33#include <scsi/iscsi_if.h>
c01be6dc 34#include <scsi/scsi_cmnd.h>
90eeb01a 35#include <scsi/scsi_bsg_iscsi.h>
1da177e4 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
0896b752 77 struct transport_container conn_cont;
0896b752 78 struct transport_container session_cont;
1da177e4
LT		 79};
80
41be1444 81static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
d8bf541e 82static struct workqueue_struct *iscsi_eh_timer_workq;
b5c7a12d 83
0896b752
AA		 84/*
85 * list of registered transports and lock that must
86 * be held while accessing list. The iscsi_transport_lock must
0b950672 87 * be acquired after the rx_queue_mutex.
0896b752
AA		 88 */
89static LIST_HEAD(iscsi_transports);
90static DEFINE_SPINLOCK(iscsi_transport_lock);
91
92#define to_iscsi_internal(tmpl) \
93 container_of(tmpl, struct iscsi_internal, t)
94
ee959b00
TJ		 95#define dev_to_iscsi_internal(_dev) \
96 container_of(_dev, struct iscsi_internal, dev)
0896b752 97
ee959b00 98static void iscsi_transport_release(struct device *dev)
0896b752 99{
ee959b00 100 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
0896b752
AA		 101 kfree(priv);
102}
1da177e4 103
0896b752
AA		 104/*
105 * iscsi_transport_class represents the iscsi_transports that are
106 * registered.
107 */
108static struct class iscsi_transport_class = {
109 .name = "iscsi_transport",
ee959b00 110 .dev_release = iscsi_transport_release,
0896b752
AA		 111};
112
113static ssize_t
ee959b00
TJ		 114show_transport_handle(struct device *dev, struct device_attribute *attr,
115 char *buf)
0896b752 116{
ee959b00 117 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
762e2bfa 118 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752 119}
ee959b00 120static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
0896b752
AA		 121
122#define show_transport_attr(name, format) \
123static ssize_t \
ee959b00
TJ		 124show_transport_##name(struct device *dev, \
125 struct device_attribute *attr,char *buf) \
0896b752 126{ \
ee959b00 127 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
0896b752
AA		 128 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
129} \
ee959b00 130static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
0896b752
AA		 131
132show_transport_attr(caps, "0x%x");
0896b752
AA		 133
134static struct attribute *iscsi_transport_attrs[] = {
ee959b00
TJ		 135 &dev_attr_handle.attr,
136 &dev_attr_caps.attr,
0896b752
AA		 137 NULL,
138};
139
140static struct attribute_group iscsi_transport_group = {
141 .attrs = iscsi_transport_attrs,
142};
143
d82ff9be
MC		 144/*
145 * iSCSI endpoint attrs
146 */
147#define iscsi_dev_to_endpoint(_dev) \
148 container_of(_dev, struct iscsi_endpoint, dev)
149
150#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
151struct device_attribute dev_attr_##_prefix##_##_name = \
152 __ATTR(_name,_mode,_show,_store)
153
154static void iscsi_endpoint_release(struct device *dev)
155{
156 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
157 kfree(ep);
158}
159
160static struct class iscsi_endpoint_class = {
161 .name = "iscsi_endpoint",
162 .dev_release = iscsi_endpoint_release,
163};
164
165static ssize_t
166show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
167{
168 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 169 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
d82ff9be
MC		 170}
171static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
172
173static struct attribute *iscsi_endpoint_attrs[] = {
174 &dev_attr_ep_handle.attr,
175 NULL,
176};
177
178static struct attribute_group iscsi_endpoint_group = {
179 .attrs = iscsi_endpoint_attrs,
180};
181
182#define ISCSI_MAX_EPID -1
183
184static int iscsi_match_epid(struct device *dev, void *data)
185{
186 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 187 uint64_t *epid = (uint64_t *) data;
d82ff9be
MC		 188
189 return *epid == ep->id;
190}
191
192struct iscsi_endpoint *
193iscsi_create_endpoint(int dd_size)
194{
195 struct device *dev;
196 struct iscsi_endpoint *ep;
21536062 197 uint64_t id;
d82ff9be
MC		 198 int err;
199
200 for (id = 1; id < ISCSI_MAX_EPID; id++) {
695794ae 201 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
d82ff9be
MC		 202 iscsi_match_epid);
203 if (!dev)
204 break;
205 }
206 if (id == ISCSI_MAX_EPID) {
207 printk(KERN_ERR "Too many connections. Max supported %u\n",
208 ISCSI_MAX_EPID - 1);
209 return NULL;
210 }
211
212 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
213 if (!ep)
214 return NULL;
215
216 ep->id = id;
217 ep->dev.class = &iscsi_endpoint_class;
71610f55 218 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
d82ff9be
MC		 219 err = device_register(&ep->dev);
220 if (err)
221 goto free_ep;
222
223 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
224 if (err)
225 goto unregister_dev;
226
227 if (dd_size)
228 ep->dd_data = &ep[1];
229 return ep;
230
231unregister_dev:
232 device_unregister(&ep->dev);
233 return NULL;
234
235free_ep:
236 kfree(ep);
237 return NULL;
238}
239EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
240
241void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
242{
243 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
244 device_unregister(&ep->dev);
245}
246EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
247
248struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
249{
f80f868e 250 struct iscsi_endpoint *ep;
d82ff9be
MC		 251 struct device *dev;
252
695794ae 253 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
d82ff9be
MC		 254 iscsi_match_epid);
255 if (!dev)
256 return NULL;
257
f80f868e
MC		 258 ep = iscsi_dev_to_endpoint(dev);
259 /*
260 * we can drop this now because the interface will prevent
261 * removals and lookups from racing.
262 */
263 put_device(dev);
264 return ep;
d82ff9be
MC		 265}
266EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
267
8d07913d
MC		 268/*
269 * Interface to display network param to sysfs
270 */
271
272static void iscsi_iface_release(struct device *dev)
273{
274 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
275 struct device *parent = iface->dev.parent;
276
277 kfree(iface);
278 put_device(parent);
279}
280
281
282static struct class iscsi_iface_class = {
283 .name = "iscsi_iface",
284 .dev_release = iscsi_iface_release,
285};
286
287#define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
288struct device_attribute dev_attr_##_prefix##_##_name = \
289 __ATTR(_name, _mode, _show, _store)
290
291/* iface attrs show */
292#define iscsi_iface_attr_show(type, name, param_type, param) \
293static ssize_t \
294show_##type##_##name(struct device *dev, struct device_attribute *attr, \
295 char *buf) \
296{ \
297 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
298 struct iscsi_transport *t = iface->transport; \
299 return t->get_iface_param(iface, param_type, param, buf); \
300} \
301
302#define iscsi_iface_net_attr(type, name, param) \
303 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
304static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
305
306/* generic read only ipvi4 attribute */
307iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
308iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
309iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
310iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
311
312/* generic read only ipv6 attribute */
313iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
314iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
315iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
316iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
317 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
318iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
319 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
320
321/* common read only iface attribute */
322iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
323iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
4223b9e9
MC		 324iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
325iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
8d07913d
MC		 326
327static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
328 struct attribute *attr, int i)
329{
330 struct device *dev = container_of(kobj, struct device, kobj);
331 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
332 struct iscsi_transport *t = iface->transport;
b78dbba0 333 int param;
8d07913d
MC		 334
335 if (attr == &dev_attr_iface_enabled.attr)
b78dbba0 336 param = ISCSI_NET_PARAM_IFACE_ENABLE;
8d07913d 337 else if (attr == &dev_attr_iface_vlan.attr)
b78dbba0 338 param = ISCSI_NET_PARAM_VLAN_ID;
4223b9e9
MC		 339 else if (attr == &dev_attr_iface_vlan_priority.attr)
340 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
341 else if (attr == &dev_attr_iface_vlan_enabled.attr)
342 param = ISCSI_NET_PARAM_VLAN_ENABLED;
b78dbba0 343 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
8d07913d 344 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
b78dbba0 345 param = ISCSI_NET_PARAM_IPV4_ADDR;
8d07913d 346 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
b78dbba0 347 param = ISCSI_NET_PARAM_IPV4_GW;
8d07913d 348 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
b78dbba0 349 param = ISCSI_NET_PARAM_IPV4_SUBNET;
8d07913d 350 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
b78dbba0
MC		 351 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
352 else
353 return 0;
8d07913d
MC		 354 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
355 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
b78dbba0 356 param = ISCSI_NET_PARAM_IPV6_ADDR;
8d07913d 357 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
b78dbba0 358 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
8d07913d 359 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
b78dbba0 360 param = ISCSI_NET_PARAM_IPV6_ROUTER;
8d07913d 361 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
b78dbba0 362 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
8d07913d 363 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
b78dbba0
MC		 364 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
365 else
366 return 0;
367 } else {
368 WARN_ONCE(1, "Invalid iface attr");
369 return 0;
8d07913d
MC		 370 }
371
b78dbba0 372 return t->attr_is_visible(ISCSI_NET_PARAM, param);
8d07913d
MC		 373}
374
375static struct attribute *iscsi_iface_attrs[] = {
376 &dev_attr_iface_enabled.attr,
377 &dev_attr_iface_vlan.attr,
4223b9e9
MC		 378 &dev_attr_iface_vlan_priority.attr,
379 &dev_attr_iface_vlan_enabled.attr,
8d07913d
MC		 380 &dev_attr_ipv4_iface_ipaddress.attr,
381 &dev_attr_ipv4_iface_gateway.attr,
382 &dev_attr_ipv4_iface_subnet.attr,
383 &dev_attr_ipv4_iface_bootproto.attr,
384 &dev_attr_ipv6_iface_ipaddress.attr,
385 &dev_attr_ipv6_iface_link_local_addr.attr,
386 &dev_attr_ipv6_iface_router_addr.attr,
387 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
388 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
389 NULL,
390};
391
392static struct attribute_group iscsi_iface_group = {
393 .attrs = iscsi_iface_attrs,
394 .is_visible = iscsi_iface_attr_is_visible,
395};
396
397struct iscsi_iface *
398iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
399 uint32_t iface_type, uint32_t iface_num, int dd_size)
400{
401 struct iscsi_iface *iface;
402 int err;
403
404 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
405 if (!iface)
406 return NULL;
407
408 iface->transport = transport;
409 iface->iface_type = iface_type;
410 iface->iface_num = iface_num;
411 iface->dev.release = iscsi_iface_release;
412 iface->dev.class = &iscsi_iface_class;
413 /* parent reference released in iscsi_iface_release */
414 iface->dev.parent = get_device(&shost->shost_gendev);
415 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
416 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
417 iface_num);
418 else
419 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
420 iface_num);
421
422 err = device_register(&iface->dev);
423 if (err)
424 goto free_iface;
425
426 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
427 if (err)
428 goto unreg_iface;
429
430 if (dd_size)
431 iface->dd_data = &iface[1];
432 return iface;
433
434unreg_iface:
435 device_unregister(&iface->dev);
436 return NULL;
437
438free_iface:
439 put_device(iface->dev.parent);
440 kfree(iface);
441 return NULL;
442}
443EXPORT_SYMBOL_GPL(iscsi_create_iface);
444
445void iscsi_destroy_iface(struct iscsi_iface *iface)
446{
447 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
448 device_unregister(&iface->dev);
449}
450EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
451
90eeb01a
MC		 452/*
453 * BSG support
454 */
455/**
456 * iscsi_bsg_host_dispatch - Dispatch command to LLD.
457 * @job: bsg job to be processed
458 */
459static int iscsi_bsg_host_dispatch(struct bsg_job *job)
460{
461 struct Scsi_Host *shost = iscsi_job_to_shost(job);
462 struct iscsi_bsg_request *req = job->request;
463 struct iscsi_bsg_reply *reply = job->reply;
464 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
465 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
466 int ret;
467
468 /* check if we have the msgcode value at least */
469 if (job->request_len < sizeof(uint32_t)) {
470 ret = -ENOMSG;
471 goto fail_host_msg;
472 }
473
474 /* Validate the host command */
475 switch (req->msgcode) {
476 case ISCSI_BSG_HST_VENDOR:
477 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
478 if ((shost->hostt->vendor_id == 0L) ||
479 (req->rqst_data.h_vendor.vendor_id !=
480 shost->hostt->vendor_id)) {
481 ret = -ESRCH;
482 goto fail_host_msg;
483 }
484 break;
485 default:
486 ret = -EBADR;
487 goto fail_host_msg;
488 }
489
490 /* check if we really have all the request data needed */
491 if (job->request_len < cmdlen) {
492 ret = -ENOMSG;
493 goto fail_host_msg;
494 }
495
496 ret = i->iscsi_transport->bsg_request(job);
497 if (!ret)
498 return 0;
499
500fail_host_msg:
501 /* return the errno failure code as the only status */
502 BUG_ON(job->reply_len < sizeof(uint32_t));
503 reply->reply_payload_rcv_len = 0;
504 reply->result = ret;
505 job->reply_len = sizeof(uint32_t);
506 bsg_job_done(job, ret, 0);
507 return 0;
508}
509
510/**
511 * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
512 * @shost: shost for iscsi_host
513 * @cls_host: iscsi_cls_host adding the structures to
514 */
515static int
516iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
517{
518 struct device *dev = &shost->shost_gendev;
519 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
520 struct request_queue *q;
521 char bsg_name[20];
522 int ret;
523
524 if (!i->iscsi_transport->bsg_request)
525 return -ENOTSUPP;
526
527 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
528
529 q = __scsi_alloc_queue(shost, bsg_request_fn);
530 if (!q)
531 return -ENOMEM;
532
533 ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
534 if (ret) {
535 shost_printk(KERN_ERR, shost, "bsg interface failed to "
536 "initialize - no request queue\n");
537 blk_cleanup_queue(q);
538 return ret;
539 }
540
541 ihost->bsg_q = q;
542 return 0;
543}
544
30a6c652 545static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 546 struct device *cdev)
30a6c652
MC		 547{
548 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 549 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 550
551 memset(ihost, 0, sizeof(*ihost));
8aae18ad 552 atomic_set(&ihost->nr_scans, 0);
7970634b 553 mutex_init(&ihost->mutex);
90eeb01a
MC		 554
555 iscsi_bsg_host_add(shost, ihost);
556 /* ignore any bsg add error - we just can't do sgio */
557
558 return 0;
559}
560
561static int iscsi_remove_host(struct transport_container *tc,
562 struct device *dev, struct device *cdev)
563{
564 struct Scsi_Host *shost = dev_to_shost(dev);
565 struct iscsi_cls_host *ihost = shost->shost_data;
566
567 if (ihost->bsg_q) {
568 bsg_remove_queue(ihost->bsg_q);
569 blk_cleanup_queue(ihost->bsg_q);
570 }
30a6c652
MC		 571 return 0;
572}
573
574static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
575 "iscsi_host",
576 iscsi_setup_host,
90eeb01a 577 iscsi_remove_host,
30a6c652
MC		 578 NULL);
579
0896b752
AA		 580static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
581 "iscsi_session",
1da177e4
LT		 582 NULL,
583 NULL,
584 NULL);
585
0896b752
AA		 586static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
587 "iscsi_connection",
1da177e4
LT		 588 NULL,
589 NULL,
590 NULL);
0896b752
AA		 591
592static struct sock *nls;
0b950672 593static DEFINE_MUTEX(rx_queue_mutex);
0896b752 594
7b7232f3
MC		 595static LIST_HEAD(sesslist);
596static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 597static LIST_HEAD(connlist);
598static DEFINE_SPINLOCK(connlock);
0896b752 599
b5c7a12d
MC		 600static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
601{
602 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
603 return sess->sid;
604}
605
606/*
607 * Returns the matching session to a given sid
608 */
609static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 610{
611 unsigned long flags;
612 struct iscsi_cls_session *sess;
613
614 spin_lock_irqsave(&sesslock, flags);
615 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 616 if (sess->sid == sid) {
7b7232f3
MC		 617 spin_unlock_irqrestore(&sesslock, flags);
618 return sess;
619 }
620 }
621 spin_unlock_irqrestore(&sesslock, flags);
622 return NULL;
623}
624
b5c7a12d
MC		 625/*
626 * Returns the matching connection to a given sid / cid tuple
627 */
628static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 629{
630 unsigned long flags;
631 struct iscsi_cls_conn *conn;
632
633 spin_lock_irqsave(&connlock, flags);
634 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 635 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 636 spin_unlock_irqrestore(&connlock, flags);
637 return conn;
638 }
639 }
640 spin_unlock_irqrestore(&connlock, flags);
641 return NULL;
642}
643
7b8631b5
MC		 644/*
645 * The following functions can be used by LLDs that allocate
646 * their own scsi_hosts or by software iscsi LLDs
647 */
6eabafbe
MC		 648static struct {
649 int value;
650 char *name;
651} iscsi_session_state_names[] = {
652 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
653 { ISCSI_SESSION_FAILED, "FAILED" },
654 { ISCSI_SESSION_FREE, "FREE" },
655};
656
3b0f208a 657static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 658{
659 int i;
660 char *name = NULL;
661
662 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
663 if (iscsi_session_state_names[i].value == state) {
664 name = iscsi_session_state_names[i].name;
665 break;
666 }
667 }
668 return name;
669}
670
671int iscsi_session_chkready(struct iscsi_cls_session *session)
672{
673 unsigned long flags;
674 int err;
675
676 spin_lock_irqsave(&session->lock, flags);
677 switch (session->state) {
678 case ISCSI_SESSION_LOGGED_IN:
679 err = 0;
680 break;
681 case ISCSI_SESSION_FAILED:
9a1a69a1 682 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 683 break;
684 case ISCSI_SESSION_FREE:
56d7fcfa 685 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 686 break;
687 default:
688 err = DID_NO_CONNECT << 16;
689 break;
690 }
691 spin_unlock_irqrestore(&session->lock, flags);
692 return err;
693}
694EXPORT_SYMBOL_GPL(iscsi_session_chkready);
695
17fa575e
MR		 696int iscsi_is_session_online(struct iscsi_cls_session *session)
697{
698 unsigned long flags;
699 int ret = 0;
700
701 spin_lock_irqsave(&session->lock, flags);
702 if (session->state == ISCSI_SESSION_LOGGED_IN)
703 ret = 1;
704 spin_unlock_irqrestore(&session->lock, flags);
705 return ret;
706}
707EXPORT_SYMBOL_GPL(iscsi_is_session_online);
708
7b8631b5
MC		 709static void iscsi_session_release(struct device *dev)
710{
711 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 712 struct Scsi_Host *shost;
0896b752 713
7b8631b5
MC		 714 shost = iscsi_session_to_shost(session);
715 scsi_host_put(shost);
632248aa 716 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
7b8631b5 717 kfree(session);
7b8631b5 718}
0896b752 719
7b8631b5
MC		 720static int iscsi_is_session_dev(const struct device *dev)
721{
722 return dev->release == iscsi_session_release;
723}
0896b752 724
a4804cd6
MC		 725static int iscsi_iter_session_fn(struct device *dev, void *data)
726{
727 void (* fn) (struct iscsi_cls_session *) = data;
728
729 if (!iscsi_is_session_dev(dev))
730 return 0;
731 fn(iscsi_dev_to_session(dev));
732 return 0;
733}
734
735void iscsi_host_for_each_session(struct Scsi_Host *shost,
736 void (*fn)(struct iscsi_cls_session *))
737{
738 device_for_each_child(&shost->shost_gendev, fn,
739 iscsi_iter_session_fn);
740}
741EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
742
8aae18ad
MC		 743/**
744 * iscsi_scan_finished - helper to report when running scans are done
745 * @shost: scsi host
746 * @time: scan run time
747 *
748 * This function can be used by drives like qla4xxx to report to the scsi
749 * layer when the scans it kicked off at module load time are done.
750 */
751int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
752{
32c6e1b9 753 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 754 /*
755 * qla4xxx will have kicked off some session unblocks before calling
756 * scsi_scan_host, so just wait for them to complete.
757 */
758 return !atomic_read(&ihost->nr_scans);
759}
760EXPORT_SYMBOL_GPL(iscsi_scan_finished);
761
7970634b
MC		 762struct iscsi_scan_data {
763 unsigned int channel;
764 unsigned int id;
765 unsigned int lun;
766};
767
768static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 769{
7970634b 770 struct iscsi_scan_data *scan_data = data;
30a6c652 771 struct iscsi_cls_session *session;
7970634b
MC		 772 struct Scsi_Host *shost;
773 struct iscsi_cls_host *ihost;
774 unsigned long flags;
775 unsigned int id;
776
777 if (!iscsi_is_session_dev(dev))
778 return 0;
779
780 session = iscsi_dev_to_session(dev);
632248aa
MC		 781
782 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
783
7970634b
MC		 784 shost = iscsi_session_to_shost(session);
785 ihost = shost->shost_data;
30a6c652
MC		 786
787 mutex_lock(&ihost->mutex);
7970634b
MC		 788 spin_lock_irqsave(&session->lock, flags);
789 if (session->state != ISCSI_SESSION_LOGGED_IN) {
790 spin_unlock_irqrestore(&session->lock, flags);
632248aa 791 goto user_scan_exit;
30a6c652 792 }
7970634b
MC		 793 id = session->target_id;
794 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 795
7970634b
MC		 796 if (id != ISCSI_MAX_TARGET) {
797 if ((scan_data->channel == SCAN_WILD_CARD ||
798 scan_data->channel == 0) &&
799 (scan_data->id == SCAN_WILD_CARD ||
800 scan_data->id == id))
801 scsi_scan_target(&session->dev, 0, id,
802 scan_data->lun, 1);
803 }
632248aa
MC		 804
805user_scan_exit:
7970634b 806 mutex_unlock(&ihost->mutex);
632248aa 807 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 808 return 0;
809}
810
7970634b
MC		 811static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
812 uint id, uint lun)
813{
814 struct iscsi_scan_data scan_data;
815
816 scan_data.channel = channel;
817 scan_data.id = id;
818 scan_data.lun = lun;
819
820 return device_for_each_child(&shost->shost_gendev, &scan_data,
821 iscsi_user_scan_session);
822}
823
bd976f62
MC		 824static void iscsi_scan_session(struct work_struct *work)
825{
826 struct iscsi_cls_session *session =
827 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 828 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 829 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 830 struct iscsi_scan_data scan_data;
bd976f62 831
7970634b
MC		 832 scan_data.channel = 0;
833 scan_data.id = SCAN_WILD_CARD;
834 scan_data.lun = SCAN_WILD_CARD;
bd976f62 835
7970634b 836 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 837 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 838}
839
c01be6dc
MC		 840/**
841 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 842 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 843 *
844 * If the session is down this function will wait for the recovery
845 * timer to fire or for the session to be logged back in. If the
846 * recovery timer fires then FAST_IO_FAIL is returned. The caller
847 * should pass this error value to the scsi eh.
848 */
849int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
850{
851 struct iscsi_cls_session *session =
852 starget_to_session(scsi_target(cmd->device));
853 unsigned long flags;
854 int ret = 0;
855
856 spin_lock_irqsave(&session->lock, flags);
857 while (session->state != ISCSI_SESSION_LOGGED_IN) {
858 if (session->state == ISCSI_SESSION_FREE) {
859 ret = FAST_IO_FAIL;
860 break;
861 }
862 spin_unlock_irqrestore(&session->lock, flags);
863 msleep(1000);
864 spin_lock_irqsave(&session->lock, flags);
865 }
866 spin_unlock_irqrestore(&session->lock, flags);
867 return ret;
868}
869EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
870
c4028958 871static void session_recovery_timedout(struct work_struct *work)
30a6c652 872{
c4028958
DH		 873 struct iscsi_cls_session *session =
874 container_of(work, struct iscsi_cls_session,
875 recovery_work.work);
6eabafbe 876 unsigned long flags;
30a6c652 877
322d739d
MC		 878 iscsi_cls_session_printk(KERN_INFO, session,
879 "session recovery timed out after %d secs\n",
880 session->recovery_tmo);
30a6c652 881
6eabafbe
MC		 882 spin_lock_irqsave(&session->lock, flags);
883 switch (session->state) {
884 case ISCSI_SESSION_FAILED:
885 session->state = ISCSI_SESSION_FREE;
886 break;
887 case ISCSI_SESSION_LOGGED_IN:
888 case ISCSI_SESSION_FREE:
889 /* we raced with the unblock's flush */
890 spin_unlock_irqrestore(&session->lock, flags);
891 return;
892 }
893 spin_unlock_irqrestore(&session->lock, flags);
894
30a6c652
MC		 895 if (session->transport->session_recovery_timedout)
896 session->transport->session_recovery_timedout(session);
897
632248aa 898 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
30a6c652 899 scsi_target_unblock(&session->dev);
632248aa 900 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 901}
902
45ab33b6 903static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 904{
45ab33b6
MC		 905 struct iscsi_cls_session *session =
906 container_of(work, struct iscsi_cls_session,
907 unblock_work);
bd976f62 908 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 909 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 910 unsigned long flags;
911
632248aa 912 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 913 /*
914 * The recovery and unblock work get run from the same workqueue,
915 * so try to cancel it if it was going to run after this unblock.
916 */
917 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 918 spin_lock_irqsave(&session->lock, flags);
919 session->state = ISCSI_SESSION_LOGGED_IN;
920 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 921 /* start IO */
922 scsi_target_unblock(&session->dev);
8aae18ad
MC		 923 /*
924 * Only do kernel scanning if the driver is properly hooked into
925 * the async scanning code (drivers like iscsi_tcp do login and
926 * scanning from userspace).
927 */
928 if (shost->hostt->scan_finished) {
06d25af4 929 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 930 atomic_inc(&ihost->nr_scans);
931 }
632248aa 932 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 933}
45ab33b6
MC		 934
935/**
936 * iscsi_unblock_session - set a session as logged in and start IO.
937 * @session: iscsi session
938 *
939 * Mark a session as ready to accept IO.
940 */
941void iscsi_unblock_session(struct iscsi_cls_session *session)
942{
943 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
944 /*
945 * make sure all the events have completed before tell the driver
946 * it is safe
947 */
948 flush_workqueue(iscsi_eh_timer_workq);
949}
30a6c652
MC		 950EXPORT_SYMBOL_GPL(iscsi_unblock_session);
951
45ab33b6 952static void __iscsi_block_session(struct work_struct *work)
30a6c652 953{
45ab33b6
MC		 954 struct iscsi_cls_session *session =
955 container_of(work, struct iscsi_cls_session,
956 block_work);
6eabafbe
MC		 957 unsigned long flags;
958
632248aa 959 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 960 spin_lock_irqsave(&session->lock, flags);
961 session->state = ISCSI_SESSION_FAILED;
962 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 963 scsi_target_block(&session->dev);
632248aa 964 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 965 if (session->recovery_tmo >= 0)
966 queue_delayed_work(iscsi_eh_timer_workq,
967 &session->recovery_work,
968 session->recovery_tmo * HZ);
30a6c652 969}
45ab33b6
MC		 970
971void iscsi_block_session(struct iscsi_cls_session *session)
972{
973 queue_work(iscsi_eh_timer_workq, &session->block_work);
974}
30a6c652
MC		 975EXPORT_SYMBOL_GPL(iscsi_block_session);
976
26974789
MC		 977static void __iscsi_unbind_session(struct work_struct *work)
978{
979 struct iscsi_cls_session *session =
980 container_of(work, struct iscsi_cls_session,
981 unbind_work);
982 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 983 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 984 unsigned long flags;
26974789 985
632248aa
MC		 986 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
987
26974789
MC		 988 /* Prevent new scans and make sure scanning is not in progress */
989 mutex_lock(&ihost->mutex);
7970634b
MC		 990 spin_lock_irqsave(&session->lock, flags);
991 if (session->target_id == ISCSI_MAX_TARGET) {
992 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 993 mutex_unlock(&ihost->mutex);
994 return;
995 }
7970634b
MC		 996 session->target_id = ISCSI_MAX_TARGET;
997 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 998 mutex_unlock(&ihost->mutex);
999
1000 scsi_remove_target(&session->dev);
1001 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 1002 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 1003}
1004
7b8631b5 1005struct iscsi_cls_session *
5d91e209
MC		 1006iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1007 int dd_size)
7b8631b5
MC		 1008{
1009 struct iscsi_cls_session *session;
7b8631b5 1010
5d91e209 1011 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 1012 GFP_KERNEL);
7b8631b5 1013 if (!session)
f53a88da
MC		 1014 return NULL;
1015
7b8631b5 1016 session->transport = transport;
30a6c652 1017 session->recovery_tmo = 120;
6eabafbe 1018 session->state = ISCSI_SESSION_FREE;
c4028958 1019 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 1020 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 1021 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1022 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 1023 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 1024 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 1025 spin_lock_init(&session->lock);
7b8631b5 1026
6a8a0d36
MC		 1027 /* this is released in the dev's release function */
1028 scsi_host_get(shost);
8434aa8b
MC		 1029 session->dev.parent = &shost->shost_gendev;
1030 session->dev.release = iscsi_session_release;
1031 device_initialize(&session->dev);
5d91e209 1032 if (dd_size)
b5c7a12d 1033 session->dd_data = &session[1];
632248aa
MC		 1034
1035 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 1036 return session;
1037}
1038EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1039
7970634b
MC		 1040static int iscsi_get_next_target_id(struct device *dev, void *data)
1041{
1042 struct iscsi_cls_session *session;
1043 unsigned long flags;
1044 int err = 0;
1045
1046 if (!iscsi_is_session_dev(dev))
1047 return 0;
1048
1049 session = iscsi_dev_to_session(dev);
1050 spin_lock_irqsave(&session->lock, flags);
1051 if (*((unsigned int *) data) == session->target_id)
1052 err = -EEXIST;
1053 spin_unlock_irqrestore(&session->lock, flags);
1054 return err;
1055}
1056
6a8a0d36 1057int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 1058{
1059 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 1060 struct iscsi_cls_host *ihost;
26974789 1061 unsigned long flags;
7970634b 1062 unsigned int id = target_id;
8434aa8b 1063 int err;
b5c7a12d 1064
30a6c652 1065 ihost = shost->shost_data;
41be1444 1066 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 1067
1068 if (id == ISCSI_MAX_TARGET) {
1069 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
1070 err = device_for_each_child(&shost->shost_gendev, &id,
1071 iscsi_get_next_target_id);
1072 if (!err)
1073 break;
1074 }
1075
1076 if (id == ISCSI_MAX_TARGET) {
1077 iscsi_cls_session_printk(KERN_ERR, session,
1078 "Too many iscsi targets. Max "
1079 "number of targets is %d.\n",
1080 ISCSI_MAX_TARGET - 1);
24add1c4 1081 err = -EOVERFLOW;
7970634b
MC		 1082 goto release_host;
1083 }
1084 }
1085 session->target_id = id;
30a6c652 1086
71610f55 1087 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 1088 err = device_add(&session->dev);
7b8631b5 1089 if (err) {
322d739d
MC		 1090 iscsi_cls_session_printk(KERN_ERR, session,
1091 "could not register session's dev\n");
8434aa8b 1092 goto release_host;
7b8631b5
MC		 1093 }
1094 transport_register_device(&session->dev);
1095
26974789
MC		 1096 spin_lock_irqsave(&sesslock, flags);
1097 list_add(&session->sess_list, &sesslist);
1098 spin_unlock_irqrestore(&sesslock, flags);
1099
26974789 1100 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 1101 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 1102 return 0;
30a6c652 1103
8434aa8b
MC		 1104release_host:
1105 scsi_host_put(shost);
1106 return err;
7b8631b5 1107}
8434aa8b 1108EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 1109
1110/**
8434aa8b
MC		 1111 * iscsi_create_session - create iscsi class session
1112 * @shost: scsi host
1113 * @transport: iscsi transport
5d91e209 1114 * @dd_size: private driver data size
eb44820c 1115 * @target_id: which target
7b8631b5 1116 *
8434aa8b 1117 * This can be called from a LLD or iscsi_transport.
eb44820c 1118 */
8434aa8b 1119struct iscsi_cls_session *
5d91e209
MC		 1120iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1121 int dd_size, unsigned int target_id)
8434aa8b
MC		 1122{
1123 struct iscsi_cls_session *session;
1124
5d91e209 1125 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 1126 if (!session)
1127 return NULL;
1128
6a8a0d36 1129 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1130 iscsi_free_session(session);
1131 return NULL;
1132 }
1133 return session;
1134}
1135EXPORT_SYMBOL_GPL(iscsi_create_session);
1136
26974789
MC		 1137static void iscsi_conn_release(struct device *dev)
1138{
1139 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1140 struct device *parent = conn->dev.parent;
1141
632248aa 1142 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1143 kfree(conn);
1144 put_device(parent);
1145}
1146
1147static int iscsi_is_conn_dev(const struct device *dev)
1148{
1149 return dev->release == iscsi_conn_release;
1150}
1151
1152static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1153{
1154 if (!iscsi_is_conn_dev(dev))
1155 return 0;
1156 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1157}
1158
8434aa8b 1159void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1160{
30a6c652 1161 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1162 unsigned long flags;
1163 int err;
1164
632248aa
MC		 1165 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1166
26974789
MC		 1167 spin_lock_irqsave(&sesslock, flags);
1168 list_del(&session->sess_list);
1169 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1170
45ab33b6
MC		 1171 /* make sure there are no blocks/unblocks queued */
1172 flush_workqueue(iscsi_eh_timer_workq);
1173 /* make sure the timedout callout is not running */
1174 if (!cancel_delayed_work(&session->recovery_work))
1175 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1176 /*
1177 * If we are blocked let commands flow again. The lld or iscsi
1178 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1179 * We assume that LLD will not be calling block/unblock while
1180 * removing the session.
26974789 1181 */
6eabafbe
MC		 1182 spin_lock_irqsave(&session->lock, flags);
1183 session->state = ISCSI_SESSION_FREE;
1184 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1185
45ab33b6
MC		 1186 scsi_target_unblock(&session->dev);
1187 /* flush running scans then delete devices */
06d25af4 1188 scsi_flush_work(shost);
45ab33b6 1189 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1190
26974789
MC		 1191 /* hw iscsi may not have removed all connections from session */
1192 err = device_for_each_child(&session->dev, NULL,
1193 iscsi_iter_destroy_conn_fn);
1194 if (err)
322d739d
MC		 1195 iscsi_cls_session_printk(KERN_ERR, session,
1196 "Could not delete all connections "
1197 "for session. Error %d.\n", err);
8434aa8b 1198
7b8631b5 1199 transport_unregister_device(&session->dev);
632248aa
MC		 1200
1201 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1202 device_del(&session->dev);
1203}
1204EXPORT_SYMBOL_GPL(iscsi_remove_session);
1205
1206void iscsi_free_session(struct iscsi_cls_session *session)
1207{
632248aa 1208 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1209 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1210 put_device(&session->dev);
7b8631b5 1211}
8434aa8b
MC		 1212EXPORT_SYMBOL_GPL(iscsi_free_session);
1213
1214/**
1215 * iscsi_destroy_session - destroy iscsi session
1216 * @session: iscsi_session
1217 *
1218 * Can be called by a LLD or iscsi_transport. There must not be
1219 * any running connections.
eb44820c 1220 */
8434aa8b
MC		 1221int iscsi_destroy_session(struct iscsi_cls_session *session)
1222{
1223 iscsi_remove_session(session);
632248aa 1224 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1225 iscsi_free_session(session);
1226 return 0;
1227}
7b8631b5
MC		 1228EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1229
7b8631b5
MC		 1230/**
1231 * iscsi_create_conn - create iscsi class connection
1232 * @session: iscsi cls session
5d91e209 1233 * @dd_size: private driver data size
7b8631b5
MC		 1234 * @cid: connection id
1235 *
1236 * This can be called from a LLD or iscsi_transport. The connection
1237 * is child of the session so cid must be unique for all connections
1238 * on the session.
b5c7a12d
MC		 1239 *
1240 * Since we do not support MCS, cid will normally be zero. In some cases
1241 * for software iscsi we could be trying to preallocate a connection struct
1242 * in which case there could be two connection structs and cid would be
1243 * non-zero.
eb44820c 1244 */
7b8631b5 1245struct iscsi_cls_conn *
5d91e209 1246iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1247{
1248 struct iscsi_transport *transport = session->transport;
7b8631b5 1249 struct iscsi_cls_conn *conn;
26974789 1250 unsigned long flags;
7b8631b5
MC		 1251 int err;
1252
5d91e209 1253 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1254 if (!conn)
1255 return NULL;
5d91e209 1256 if (dd_size)
7b8631b5
MC		 1257 conn->dd_data = &conn[1];
1258
22a39fbb 1259 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1260 INIT_LIST_HEAD(&conn->conn_list);
1261 conn->transport = transport;
b5c7a12d 1262 conn->cid = cid;
7b8631b5
MC		 1263
1264 /* this is released in the dev's release function */
1265 if (!get_device(&session->dev))
43a145a3 1266 goto free_conn;
b5c7a12d 1267
71610f55 1268 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1269 conn->dev.parent = &session->dev;
1270 conn->dev.release = iscsi_conn_release;
1271 err = device_register(&conn->dev);
1272 if (err) {
322d739d
MC		 1273 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1274 "register connection's dev\n");
7b8631b5
MC		 1275 goto release_parent_ref;
1276 }
1277 transport_register_device(&conn->dev);
26974789
MC		 1278
1279 spin_lock_irqsave(&connlock, flags);
1280 list_add(&conn->conn_list, &connlist);
26974789 1281 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1282
1283 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1284 return conn;
1285
1286release_parent_ref:
1287 put_device(&session->dev);
1288free_conn:
1289 kfree(conn);
1290 return NULL;
1291}
1292
1293EXPORT_SYMBOL_GPL(iscsi_create_conn);
1294
1295/**
1296 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1297 * @conn: iscsi cls session
7b8631b5 1298 *
26974789 1299 * This can be called from a LLD or iscsi_transport.
eb44820c 1300 */
7b8631b5
MC		 1301int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1302{
26974789
MC		 1303 unsigned long flags;
1304
1305 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1306 list_del(&conn->conn_list);
1307 spin_unlock_irqrestore(&connlock, flags);
1308
7b8631b5 1309 transport_unregister_device(&conn->dev);
632248aa 1310 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1311 device_unregister(&conn->dev);
1312 return 0;
1313}
7b8631b5
MC		 1314EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1315
7b8631b5
MC		 1316/*
1317 * iscsi interface functions
1318 */
0896b752
AA		 1319static struct iscsi_internal *
1320iscsi_if_transport_lookup(struct iscsi_transport *tt)
1321{
1322 struct iscsi_internal *priv;
1323 unsigned long flags;
1324
1325 spin_lock_irqsave(&iscsi_transport_lock, flags);
1326 list_for_each_entry(priv, &iscsi_transports, list) {
1327 if (tt == priv->iscsi_transport) {
1328 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1329 return priv;
1330 }
1331 }
1332 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1333 return NULL;
1334}
1da177e4 1335
53cb8a1f 1336static int
43514774 1337iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1338{
43514774 1339 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1340}
1da177e4 1341
7b7232f3 1342int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1343 char *data, uint32_t data_size)
1da177e4 1344{
0896b752
AA		 1345 struct nlmsghdr *nlh;
1346 struct sk_buff *skb;
1347 struct iscsi_uevent *ev;
0896b752 1348 char *pdu;
790f39a2 1349 struct iscsi_internal *priv;
0896b752
AA		 1350 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1351 data_size);
1352
790f39a2
MC		 1353 priv = iscsi_if_transport_lookup(conn->transport);
1354 if (!priv)
1355 return -EINVAL;
1356
43a145a3 1357 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1358 if (!skb) {
e5bd7b54 1359 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1360 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1361 "control PDU: OOM\n");
0896b752
AA		 1362 return -ENOMEM;
1363 }
1da177e4 1364
43514774 1365 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1366 ev = NLMSG_DATA(nlh);
1367 memset(ev, 0, sizeof(*ev));
1368 ev->transport_handle = iscsi_handle(conn->transport);
1369 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1370 ev->r.recv_req.cid = conn->cid;
1371 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1372 pdu = (char*)ev + sizeof(*ev);
1373 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1374 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1375
43514774 1376 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1377}
0896b752 1378EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1379
43514774
MC		 1380int iscsi_offload_mesg(struct Scsi_Host *shost,
1381 struct iscsi_transport *transport, uint32_t type,
1382 char *data, uint16_t data_size)
1383{
1384 struct nlmsghdr *nlh;
1385 struct sk_buff *skb;
1386 struct iscsi_uevent *ev;
1387 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1388
a541f840 1389 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1390 if (!skb) {
1391 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1392 return -ENOMEM;
1393 }
1394
1395 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1396 ev = NLMSG_DATA(nlh);
1397 memset(ev, 0, sizeof(*ev));
1398 ev->type = type;
1399 ev->transport_handle = iscsi_handle(transport);
1400 switch (type) {
1401 case ISCSI_KEVENT_PATH_REQ:
1402 ev->r.req_path.host_no = shost->host_no;
1403 break;
1404 case ISCSI_KEVENT_IF_DOWN:
1405 ev->r.notify_if_down.host_no = shost->host_no;
1406 break;
1407 }
1408
1409 memcpy((char *)ev + sizeof(*ev), data, data_size);
1410
a541f840 1411 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1412}
1413EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1414
e5bd7b54 1415void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1416{
0896b752
AA		 1417 struct nlmsghdr *nlh;
1418 struct sk_buff *skb;
1419 struct iscsi_uevent *ev;
790f39a2 1420 struct iscsi_internal *priv;
0896b752
AA		 1421 int len = NLMSG_SPACE(sizeof(*ev));
1422
790f39a2
MC		 1423 priv = iscsi_if_transport_lookup(conn->transport);
1424 if (!priv)
1425 return;
1426
43a145a3 1427 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1428 if (!skb) {
322d739d
MC		 1429 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1430 "conn error (%d)\n", error);
0896b752
AA		 1431 return;
1432 }
1433
43514774 1434 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1435 ev = NLMSG_DATA(nlh);
1436 ev->transport_handle = iscsi_handle(conn->transport);
1437 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1438 ev->r.connerror.error = error;
b5c7a12d
MC		 1439 ev->r.connerror.cid = conn->cid;
1440 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1441
43514774 1442 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1443
322d739d
MC		 1444 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1445 error);
0896b752 1446}
e5bd7b54 1447EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752 1448
17fa575e
MR		 1449void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1450 enum iscsi_conn_state state)
1451{
1452 struct nlmsghdr *nlh;
1453 struct sk_buff *skb;
1454 struct iscsi_uevent *ev;
1455 struct iscsi_internal *priv;
1456 int len = NLMSG_SPACE(sizeof(*ev));
1457
1458 priv = iscsi_if_transport_lookup(conn->transport);
1459 if (!priv)
1460 return;
1461
1462 skb = alloc_skb(len, GFP_ATOMIC);
1463 if (!skb) {
1464 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1465 "conn login (%d)\n", state);
1466 return;
1467 }
1468
1469 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1470 ev = NLMSG_DATA(nlh);
1471 ev->transport_handle = iscsi_handle(conn->transport);
1472 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1473 ev->r.conn_login.state = state;
1474 ev->r.conn_login.cid = conn->cid;
1475 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1476 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1477
1478 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1479 state);
1480}
1481EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1482
0896b752 1483static int
43514774
MC		 1484iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1485 void *payload, int size)
0896b752
AA		 1486{
1487 struct sk_buff *skb;
1488 struct nlmsghdr *nlh;
1489 int len = NLMSG_SPACE(size);
1490 int flags = multi ? NLM_F_MULTI : 0;
1491 int t = done ? NLMSG_DONE : type;
1492
43a145a3 1493 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1494 if (!skb) {
1495 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1496 return -ENOMEM;
1497 }
0896b752 1498
43514774 1499 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1500 nlh->nlmsg_flags = flags;
1501 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1502 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1503}
1da177e4 1504
7b8631b5 1505static int
5b940adf 1506iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1507{
1508 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1509 struct iscsi_stats *stats;
1510 struct sk_buff *skbstat;
1511 struct iscsi_cls_conn *conn;
1512 struct nlmsghdr *nlhstat;
1513 struct iscsi_uevent *evstat;
790f39a2 1514 struct iscsi_internal *priv;
7b8631b5
MC		 1515 int len = NLMSG_SPACE(sizeof(*ev) +
1516 sizeof(struct iscsi_stats) +
1517 sizeof(struct iscsi_stats_custom) *
1518 ISCSI_STATS_CUSTOM_MAX);
1519 int err = 0;
0896b752 1520
790f39a2
MC		 1521 priv = iscsi_if_transport_lookup(transport);
1522 if (!priv)
1523 return -EINVAL;
1524
b5c7a12d 1525 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1526 if (!conn)
1527 return -EEXIST;
0896b752 1528
7b8631b5
MC		 1529 do {
1530 int actual_size;
0896b752 1531
43a145a3 1532 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1533 if (!skbstat) {
322d739d
MC		 1534 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1535 "deliver stats: OOM\n");
7b8631b5
MC		 1536 return -ENOMEM;
1537 }
1538
43514774 1539 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1540 (len - sizeof(*nlhstat)), 0);
1541 evstat = NLMSG_DATA(nlhstat);
1542 memset(evstat, 0, sizeof(*evstat));
1543 evstat->transport_handle = iscsi_handle(conn->transport);
1544 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1545 evstat->u.get_stats.cid =
1546 ev->u.get_stats.cid;
1547 evstat->u.get_stats.sid =
1548 ev->u.get_stats.sid;
7b8631b5
MC		 1549 stats = (struct iscsi_stats *)
1550 ((char*)evstat + sizeof(*evstat));
1551 memset(stats, 0, sizeof(*stats));
1552
7b7232f3 1553 transport->get_stats(conn, stats);
7b8631b5
MC		 1554 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1555 sizeof(struct iscsi_stats) +
1556 sizeof(struct iscsi_stats_custom) *
1557 stats->custom_length);
1558 actual_size -= sizeof(*nlhstat);
1559 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1560 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1561 nlhstat->nlmsg_len = actual_size;
1562
43514774
MC		 1563 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1564 GFP_ATOMIC);
7b8631b5
MC		 1565 } while (err < 0 && err != -ECONNREFUSED);
1566
1567 return err;
0896b752
AA		 1568}
1569
53cb8a1f 1570/**
26974789
MC		 1571 * iscsi_session_event - send session destr. completion event
1572 * @session: iscsi class session
1573 * @event: type of event
eb44820c 1574 */
26974789
MC		 1575int iscsi_session_event(struct iscsi_cls_session *session,
1576 enum iscsi_uevent_e event)
53cb8a1f
MC		 1577{
1578 struct iscsi_internal *priv;
53cb8a1f
MC		 1579 struct Scsi_Host *shost;
1580 struct iscsi_uevent *ev;
1581 struct sk_buff *skb;
1582 struct nlmsghdr *nlh;
53cb8a1f
MC		 1583 int rc, len = NLMSG_SPACE(sizeof(*ev));
1584
26974789 1585 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1586 if (!priv)
1587 return -EINVAL;
53cb8a1f
MC		 1588 shost = iscsi_session_to_shost(session);
1589
43a145a3 1590 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1591 if (!skb) {
322d739d
MC		 1592 iscsi_cls_session_printk(KERN_ERR, session,
1593 "Cannot notify userspace of session "
1594 "event %u\n", event);
53cb8a1f
MC		 1595 return -ENOMEM;
1596 }
1597
43514774 1598 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1599 ev = NLMSG_DATA(nlh);
26974789 1600 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1601
26974789
MC		 1602 ev->type = event;
1603 switch (event) {
1604 case ISCSI_KEVENT_DESTROY_SESSION:
1605 ev->r.d_session.host_no = shost->host_no;
1606 ev->r.d_session.sid = session->sid;
1607 break;
1608 case ISCSI_KEVENT_CREATE_SESSION:
1609 ev->r.c_session_ret.host_no = shost->host_no;
1610 ev->r.c_session_ret.sid = session->sid;
1611 break;
1612 case ISCSI_KEVENT_UNBIND_SESSION:
1613 ev->r.unbind_session.host_no = shost->host_no;
1614 ev->r.unbind_session.sid = session->sid;
1615 break;
1616 default:
322d739d
MC		 1617 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1618 "%u.\n", event);
26974789 1619 kfree_skb(skb);
53cb8a1f 1620 return -EINVAL;
53cb8a1f
MC		 1621 }
1622
53cb8a1f
MC		 1623 /*
1624 * this will occur if the daemon is not up, so we just warn
1625 * the user and when the daemon is restarted it will handle it
1626 */
43514774 1627 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1628 if (rc == -ESRCH)
322d739d
MC		 1629 iscsi_cls_session_printk(KERN_ERR, session,
1630 "Cannot notify userspace of session "
1631 "event %u. Check iscsi daemon\n",
1632 event);
632248aa
MC		 1633
1634 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1635 event, rc);
53cb8a1f
MC		 1636 return rc;
1637}
26974789 1638EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1639
0896b752 1640static int
d82ff9be
MC		 1641iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1642 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1643 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1644{
1645 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1646 struct iscsi_cls_session *session;
5e7facb7 1647 struct Scsi_Host *shost;
0896b752 1648
d82ff9be 1649 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1650 initial_cmdsn);
7b7232f3 1651 if (!session)
7b8631b5 1652 return -ENOMEM;
0896b752 1653
5e7facb7
MC		 1654 shost = iscsi_session_to_shost(session);
1655 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1656 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1657 ISCSI_DBG_TRANS_SESSION(session,
1658 "Completed creating transport session\n");
0896b752 1659 return 0;
0896b752
AA		 1660}
1661
1662static int
7b7232f3 1663iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1664{
7b8631b5 1665 struct iscsi_cls_conn *conn;
7b7232f3 1666 struct iscsi_cls_session *session;
7b8631b5 1667
b5c7a12d
MC		 1668 session = iscsi_session_lookup(ev->u.c_conn.sid);
1669 if (!session) {
322d739d 1670 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1671 ev->u.c_conn.sid);
7b8631b5 1672 return -EINVAL;
b5c7a12d 1673 }
0896b752 1674
7b7232f3 1675 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1676 if (!conn) {
322d739d
MC		 1677 iscsi_cls_session_printk(KERN_ERR, session,
1678 "couldn't create a new connection.");
7b7232f3 1679 return -ENOMEM;
b5c7a12d 1680 }
0896b752 1681
b5c7a12d
MC		 1682 ev->r.c_conn_ret.sid = session->sid;
1683 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1684
1685 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1686 return 0;
1da177e4
LT		 1687}
1688
0896b752
AA		 1689static int
1690iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1691{
7b8631b5 1692 struct iscsi_cls_conn *conn;
0896b752 1693
b5c7a12d 1694 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1695 if (!conn)
7b8631b5 1696 return -EINVAL;
0896b752 1697
632248aa 1698 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1699 if (transport->destroy_conn)
1700 transport->destroy_conn(conn);
632248aa 1701
7b8631b5 1702 return 0;
0896b752
AA		 1703}
1704
fd7255f5
MC		 1705static int
1706iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1707{
1708 char *data = (char*)ev + sizeof(*ev);
1709 struct iscsi_cls_conn *conn;
1710 struct iscsi_cls_session *session;
a54a52ca 1711 int err = 0, value = 0;
fd7255f5
MC		 1712
1713 session = iscsi_session_lookup(ev->u.set_param.sid);
1714 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1715 if (!conn || !session)
1716 return -EINVAL;
1717
1718 switch (ev->u.set_param.param) {
30a6c652 1719 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1720 sscanf(data, "%d", &value);
fdd46dcb 1721 session->recovery_tmo = value;
30a6c652 1722 break;
fd7255f5 1723 default:
a54a52ca
MC		 1724 err = transport->set_param(conn, ev->u.set_param.param,
1725 data, ev->u.set_param.len);
fd7255f5
MC		 1726 }
1727
1728 return err;
1729}
1730
10eb0f01
MC		 1731static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1732 struct iscsi_uevent *ev, int msg_type)
1733{
1734 struct iscsi_endpoint *ep;
1735 struct sockaddr *dst_addr;
1736 struct Scsi_Host *shost = NULL;
1737 int non_blocking, err = 0;
1738
1739 if (!transport->ep_connect)
1740 return -EINVAL;
1741
1742 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1743 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1744 if (!shost) {
1745 printk(KERN_ERR "ep connect failed. Could not find "
1746 "host no %u\n",
1747 ev->u.ep_connect_through_host.host_no);
1748 return -ENODEV;
1749 }
1750 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1751 } else
1752 non_blocking = ev->u.ep_connect.non_blocking;
1753
1754 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1755 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1756 if (IS_ERR(ep)) {
1757 err = PTR_ERR(ep);
1758 goto release_host;
1759 }
1760
1761 ev->r.ep_connect_ret.handle = ep->id;
1762release_host:
1763 if (shost)
1764 scsi_host_put(shost);
1765 return err;
1766}
1767
22a39fbb
MC		 1768static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1769 u64 ep_handle)
1770{
1771 struct iscsi_cls_conn *conn;
1772 struct iscsi_endpoint *ep;
1773
1774 if (!transport->ep_disconnect)
1775 return -EINVAL;
1776
1777 ep = iscsi_lookup_endpoint(ep_handle);
1778 if (!ep)
1779 return -EINVAL;
1780 conn = ep->conn;
1781 if (conn) {
1782 mutex_lock(&conn->ep_mutex);
1783 conn->ep = NULL;
1784 mutex_unlock(&conn->ep_mutex);
1785 }
1786
1787 transport->ep_disconnect(ep);
1788 return 0;
1789}
1790
264faaaa
OG		 1791static int
1792iscsi_if_transport_ep(struct iscsi_transport *transport,
1793 struct iscsi_uevent *ev, int msg_type)
1794{
d82ff9be 1795 struct iscsi_endpoint *ep;
264faaaa
OG		 1796 int rc = 0;
1797
1798 switch (msg_type) {
10eb0f01 1799 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1800 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1801 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1802 break;
1803 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1804 if (!transport->ep_poll)
1805 return -EINVAL;
1806
d82ff9be
MC		 1807 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1808 if (!ep)
1809 return -EINVAL;
1810
1811 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1812 ev->u.ep_poll.timeout_ms);
1813 break;
1814 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1815 rc = iscsi_if_ep_disconnect(transport,
1816 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1817 break;
1818 }
1819 return rc;
1820}
1821
01cb225d
MC		 1822static int
1823iscsi_tgt_dscvr(struct iscsi_transport *transport,
1824 struct iscsi_uevent *ev)
1825{
2174a04e 1826 struct Scsi_Host *shost;
01cb225d 1827 struct sockaddr *dst_addr;
2174a04e 1828 int err;
01cb225d
MC		 1829
1830 if (!transport->tgt_dscvr)
1831 return -EINVAL;
1832
2174a04e 1833 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1834 if (!shost) {
2174a04e
MC		 1835 printk(KERN_ERR "target discovery could not find host no %u\n",
1836 ev->u.tgt_dscvr.host_no);
1837 return -ENODEV;
1838 }
1839
1840
01cb225d 1841 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1842 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1843 ev->u.tgt_dscvr.enable, dst_addr);
1844 scsi_host_put(shost);
1845 return err;
01cb225d
MC		 1846}
1847
1d9bf13a
MC		 1848static int
1849iscsi_set_host_param(struct iscsi_transport *transport,
1850 struct iscsi_uevent *ev)
1851{
1852 char *data = (char*)ev + sizeof(*ev);
1853 struct Scsi_Host *shost;
1854 int err;
1855
1856 if (!transport->set_host_param)
1857 return -ENOSYS;
1858
1859 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1860 if (!shost) {
1d9bf13a
MC		 1861 printk(KERN_ERR "set_host_param could not find host no %u\n",
1862 ev->u.set_host_param.host_no);
1863 return -ENODEV;
1864 }
1865
1866 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1867 data, ev->u.set_host_param.len);
1868 scsi_host_put(shost);
1869 return err;
1870}
1871
0896b752 1872static int
43514774
MC		 1873iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1874{
1875 struct Scsi_Host *shost;
1876 struct iscsi_path *params;
1877 int err;
1878
1879 if (!transport->set_path)
1880 return -ENOSYS;
1881
1882 shost = scsi_host_lookup(ev->u.set_path.host_no);
1883 if (!shost) {
1884 printk(KERN_ERR "set path could not find host no %u\n",
1885 ev->u.set_path.host_no);
1886 return -ENODEV;
1887 }
1888
1889 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1890 err = transport->set_path(shost, params);
1891
1892 scsi_host_put(shost);
1893 return err;
1894}
1895
56c155b5
MC		 1896static int
1897iscsi_set_iface_params(struct iscsi_transport *transport,
1898 struct iscsi_uevent *ev)
1899{
1900 char *data = (char *)ev + sizeof(*ev);
1901 struct Scsi_Host *shost;
1902 int err;
1903
1904 if (!transport->set_iface_param)
1905 return -ENOSYS;
1906
1907 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1908 if (!shost) {
1909 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1910 ev->u.set_iface_params.host_no);
1911 return -ENODEV;
1912 }
1913
1914 err = transport->set_iface_param(shost, data,
1915 ev->u.set_iface_params.count);
1916 scsi_host_put(shost);
1917 return err;
1918}
1919
43514774
MC		 1920static int
1921iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 1922{
1923 int err = 0;
1924 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1925 struct iscsi_transport *transport = NULL;
1926 struct iscsi_internal *priv;
7b7232f3
MC		 1927 struct iscsi_cls_session *session;
1928 struct iscsi_cls_conn *conn;
d82ff9be 1929 struct iscsi_endpoint *ep = NULL;
0896b752 1930
43514774
MC		 1931 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1932 *group = ISCSI_NL_GRP_UIP;
1933 else
1934 *group = ISCSI_NL_GRP_ISCSID;
1935
0896b752
AA		 1936 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1937 if (!priv)
1938 return -EINVAL;
1939 transport = priv->iscsi_transport;
1940
7b7232f3
MC		 1941 if (!try_module_get(transport->owner))
1942 return -EINVAL;
1943
0896b752
AA		 1944 switch (nlh->nlmsg_type) {
1945 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1946 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1947 ev->u.c_session.initial_cmdsn,
1948 ev->u.c_session.cmds_max,
1949 ev->u.c_session.queue_depth);
1950 break;
1951 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1952 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1953 if (!ep) {
1954 err = -EINVAL;
1955 break;
1956 }
d82ff9be
MC		 1957
1958 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1959 ev->u.c_bound_session.initial_cmdsn,
1960 ev->u.c_bound_session.cmds_max,
1961 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1962 break;
1963 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1964 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1965 if (session)
7b7232f3 1966 transport->destroy_session(session);
26974789
MC		 1967 else
1968 err = -EINVAL;
1969 break;
1970 case ISCSI_UEVENT_UNBIND_SESSION:
1971 session = iscsi_session_lookup(ev->u.d_session.sid);
1972 if (session)
06d25af4
MC		 1973 scsi_queue_work(iscsi_session_to_shost(session),
1974 &session->unbind_work);
26974789 1975 else
7b7232f3 1976 err = -EINVAL;
0896b752
AA		 1977 break;
1978 case ISCSI_UEVENT_CREATE_CONN:
1979 err = iscsi_if_create_conn(transport, ev);
1980 break;
1981 case ISCSI_UEVENT_DESTROY_CONN:
1982 err = iscsi_if_destroy_conn(transport, ev);
1983 break;
1984 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1985 session = iscsi_session_lookup(ev->u.b_conn.sid);
1986 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 1987
22a39fbb
MC		 1988 if (conn && conn->ep)
1989 iscsi_if_ep_disconnect(transport, conn->ep->id);
1990
1991 if (!session || !conn) {
7b7232f3 1992 err = -EINVAL;
22a39fbb
MC		 1993 break;
1994 }
1995
1996 ev->r.retcode = transport->bind_conn(session, conn,
1997 ev->u.b_conn.transport_eph,
1998 ev->u.b_conn.is_leading);
1999 if (ev->r.retcode || !transport->ep_connect)
2000 break;
2001
2002 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2003 if (ep) {
2004 ep->conn = conn;
2005
2006 mutex_lock(&conn->ep_mutex);
2007 conn->ep = ep;
2008 mutex_unlock(&conn->ep_mutex);
2009 } else
2010 iscsi_cls_conn_printk(KERN_ERR, conn,
2011 "Could not set ep conn "
2012 "binding\n");
0896b752
AA		 2013 break;
2014 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 2015 err = iscsi_set_param(transport, ev);
0896b752
AA		 2016 break;
2017 case ISCSI_UEVENT_START_CONN:
b5c7a12d 2018 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 2019 if (conn)
2020 ev->r.retcode = transport->start_conn(conn);
2021 else
2022 err = -EINVAL;
0896b752
AA		 2023 break;
2024 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 2025 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 2026 if (conn)
2027 transport->stop_conn(conn, ev->u.stop_conn.flag);
2028 else
2029 err = -EINVAL;
0896b752
AA		 2030 break;
2031 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 2032 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 2033 if (conn)
2034 ev->r.retcode = transport->send_pdu(conn,
2035 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2036 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2037 ev->u.send_pdu.data_size);
2038 else
2039 err = -EINVAL;
0896b752
AA		 2040 break;
2041 case ISCSI_UEVENT_GET_STATS:
5b940adf 2042 err = iscsi_if_get_stats(transport, nlh);
0896b752 2043 break;
264faaaa
OG		 2044 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2045 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2046 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 2047 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 2048 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2049 break;
01cb225d
MC		 2050 case ISCSI_UEVENT_TGT_DSCVR:
2051 err = iscsi_tgt_dscvr(transport, ev);
2052 break;
1d9bf13a
MC		 2053 case ISCSI_UEVENT_SET_HOST_PARAM:
2054 err = iscsi_set_host_param(transport, ev);
2055 break;
43514774
MC		 2056 case ISCSI_UEVENT_PATH_UPDATE:
2057 err = iscsi_set_path(transport, ev);
2058 break;
56c155b5
MC		 2059 case ISCSI_UEVENT_SET_IFACE_PARAMS:
2060 err = iscsi_set_iface_params(transport, ev);
2061 break;
0896b752 2062 default:
1d9bf13a 2063 err = -ENOSYS;
0896b752
AA		 2064 break;
2065 }
2066
7b7232f3 2067 module_put(transport->owner);
0896b752
AA		 2068 return err;
2069}
2070
b5c7a12d 2071/*
cd40b7d3
DL		 2072 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
2073 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 2074 */
0896b752 2075static void
cd40b7d3 2076iscsi_if_rx(struct sk_buff *skb)
0896b752 2077{
0b950672 2078 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 2079 while (skb->len >= NLMSG_SPACE(0)) {
2080 int err;
2081 uint32_t rlen;
2082 struct nlmsghdr *nlh;
2083 struct iscsi_uevent *ev;
43514774 2084 uint32_t group;
cd40b7d3
DL		 2085
2086 nlh = nlmsg_hdr(skb);
2087 if (nlh->nlmsg_len < sizeof(*nlh) ||
2088 skb->len < nlh->nlmsg_len) {
2089 break;
ee7f8e40 2090 }
ee7f8e40 2091
cd40b7d3
DL		 2092 ev = NLMSG_DATA(nlh);
2093 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2094 if (rlen > skb->len)
2095 rlen = skb->len;
0896b752 2096
43514774 2097 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 2098 if (err) {
2099 ev->type = ISCSI_KEVENT_IF_ERROR;
2100 ev->iferror = err;
0896b752 2101 }
cd40b7d3
DL		 2102 do {
2103 /*
2104 * special case for GET_STATS:
2105 * on success - sending reply and stats from
2106 * inside of if_recv_msg(),
2107 * on error - fall through.
2108 */
2109 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2110 break;
43514774 2111 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3
DL		 2112 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2113 } while (err < 0 && err != -ECONNREFUSED);
2114 skb_pull(skb, rlen);
0896b752 2115 }
0b950672 2116 mutex_unlock(&rx_queue_mutex);
0896b752 2117}
1da177e4 2118
fd7255f5 2119#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 2120struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 2121 __ATTR(_name,_mode,_show,_store)
2122
1da177e4 2123/*
0896b752 2124 * iSCSI connection attrs
1da177e4 2125 */
a54a52ca 2126#define iscsi_conn_attr_show(param) \
0896b752 2127static ssize_t \
ee959b00
TJ		 2128show_conn_param_##param(struct device *dev, \
2129 struct device_attribute *attr, char *buf) \
0896b752 2130{ \
ee959b00 2131 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 2132 struct iscsi_transport *t = conn->transport; \
a54a52ca 2133 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 2134}
2135
a54a52ca
MC		 2136#define iscsi_conn_attr(field, param) \
2137 iscsi_conn_attr_show(param) \
2138static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 2139 NULL);
0896b752 2140
a54a52ca
MC		 2141iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2142iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2143iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2144iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2145iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2146iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2147iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 2148iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2149iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 2150iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2151iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 2152
289324b0
MC		 2153#define iscsi_conn_ep_attr_show(param) \
2154static ssize_t show_conn_ep_param_##param(struct device *dev, \
2155 struct device_attribute *attr,\
2156 char *buf) \
2157{ \
2158 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2159 struct iscsi_transport *t = conn->transport; \
2160 struct iscsi_endpoint *ep; \
2161 ssize_t rc; \
2162 \
2163 /* \
2164 * Need to make sure ep_disconnect does not free the LLD's \
2165 * interconnect resources while we are trying to read them. \
2166 */ \
2167 mutex_lock(&conn->ep_mutex); \
2168 ep = conn->ep; \
2169 if (!ep && t->ep_connect) { \
2170 mutex_unlock(&conn->ep_mutex); \
2171 return -ENOTCONN; \
2172 } \
2173 \
2174 if (ep) \
2175 rc = t->get_ep_param(ep, param, buf); \
2176 else \
2177 rc = t->get_conn_param(conn, param, buf); \
2178 mutex_unlock(&conn->ep_mutex); \
2179 return rc; \
2180}
2181
2182#define iscsi_conn_ep_attr(field, param) \
2183 iscsi_conn_ep_attr_show(param) \
2184static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2185 show_conn_ep_param_##param, NULL);
2186
2187iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2188iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2189
3128c6c7
MC		 2190static struct attribute *iscsi_conn_attrs[] = {
2191 &dev_attr_conn_max_recv_dlength.attr,
2192 &dev_attr_conn_max_xmit_dlength.attr,
2193 &dev_attr_conn_header_digest.attr,
2194 &dev_attr_conn_data_digest.attr,
2195 &dev_attr_conn_ifmarker.attr,
2196 &dev_attr_conn_ofmarker.attr,
2197 &dev_attr_conn_address.attr,
2198 &dev_attr_conn_port.attr,
2199 &dev_attr_conn_exp_statsn.attr,
2200 &dev_attr_conn_persistent_address.attr,
2201 &dev_attr_conn_persistent_port.attr,
2202 &dev_attr_conn_ping_tmo.attr,
2203 &dev_attr_conn_recv_tmo.attr,
2204 NULL,
2205};
2206
2207static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2208 struct attribute *attr, int i)
2209{
2210 struct device *cdev = container_of(kobj, struct device, kobj);
2211 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2212 struct iscsi_transport *t = conn->transport;
2213 int param;
2214
2215 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2216 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2217 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2218 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2219 else if (attr == &dev_attr_conn_header_digest.attr)
2220 param = ISCSI_PARAM_HDRDGST_EN;
2221 else if (attr == &dev_attr_conn_data_digest.attr)
2222 param = ISCSI_PARAM_DATADGST_EN;
2223 else if (attr == &dev_attr_conn_ifmarker.attr)
2224 param = ISCSI_PARAM_IFMARKER_EN;
2225 else if (attr == &dev_attr_conn_ofmarker.attr)
2226 param = ISCSI_PARAM_OFMARKER_EN;
2227 else if (attr == &dev_attr_conn_address.attr)
2228 param = ISCSI_PARAM_CONN_ADDRESS;
2229 else if (attr == &dev_attr_conn_port.attr)
2230 param = ISCSI_PARAM_CONN_PORT;
2231 else if (attr == &dev_attr_conn_exp_statsn.attr)
2232 param = ISCSI_PARAM_EXP_STATSN;
2233 else if (attr == &dev_attr_conn_persistent_address.attr)
2234 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2235 else if (attr == &dev_attr_conn_persistent_port.attr)
2236 param = ISCSI_PARAM_PERSISTENT_PORT;
2237 else if (attr == &dev_attr_conn_ping_tmo.attr)
2238 param = ISCSI_PARAM_PING_TMO;
2239 else if (attr == &dev_attr_conn_recv_tmo.attr)
2240 param = ISCSI_PARAM_RECV_TMO;
2241 else {
2242 WARN_ONCE(1, "Invalid conn attr");
2243 return 0;
2244 }
2245
2246 return t->attr_is_visible(ISCSI_PARAM, param);
2247}
2248
2249static struct attribute_group iscsi_conn_group = {
2250 .attrs = iscsi_conn_attrs,
2251 .is_visible = iscsi_conn_attr_is_visible,
2252};
2253
1da177e4 2254/*
0896b752 2255 * iSCSI session attrs
1da177e4 2256 */
b2c64167 2257#define iscsi_session_attr_show(param, perm) \
fd7255f5 2258static ssize_t \
ee959b00
TJ		 2259show_session_param_##param(struct device *dev, \
2260 struct device_attribute *attr, char *buf) \
fd7255f5 2261{ \
ee959b00
TJ		 2262 struct iscsi_cls_session *session = \
2263 iscsi_dev_to_session(dev->parent); \
fd7255f5 2264 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2265 \
2266 if (perm && !capable(CAP_SYS_ADMIN)) \
2267 return -EACCES; \
a54a52ca 2268 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2269}
2270
b2c64167
MC		 2271#define iscsi_session_attr(field, param, perm) \
2272 iscsi_session_attr_show(param, perm) \
a54a52ca 2273static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5 2274 NULL);
b2c64167
MC		 2275iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2276iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2277iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2278iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2279iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2280iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2281iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2282iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2283iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2284iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2285iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2286iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2287iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2288iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 2289iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2290iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2291iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2292iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2293iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2294iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2295iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2296
6eabafbe 2297static ssize_t
ee959b00
TJ		 2298show_priv_session_state(struct device *dev, struct device_attribute *attr,
2299 char *buf)
6eabafbe 2300{
ee959b00 2301 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2302 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2303}
2304static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2305 NULL);
2306
fd7255f5
MC		 2307#define iscsi_priv_session_attr_show(field, format) \
2308static ssize_t \
ee959b00
TJ		 2309show_priv_session_##field(struct device *dev, \
2310 struct device_attribute *attr, char *buf) \
fd7255f5 2311{ \
ee959b00
TJ		 2312 struct iscsi_cls_session *session = \
2313 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2314 if (session->field == -1) \
2315 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2316 return sprintf(buf, format"\n", session->field); \
2317}
2318
fe4f0bde
VC		 2319#define iscsi_priv_session_attr_store(field) \
2320static ssize_t \
2321store_priv_session_##field(struct device *dev, \
2322 struct device_attribute *attr, \
2323 const char *buf, size_t count) \
2324{ \
2325 int val; \
2326 char *cp; \
2327 struct iscsi_cls_session *session = \
2328 iscsi_dev_to_session(dev->parent); \
2329 if ((session->state == ISCSI_SESSION_FREE) || \
2330 (session->state == ISCSI_SESSION_FAILED)) \
2331 return -EBUSY; \
2332 if (strncmp(buf, "off", 3) == 0) \
2333 session->field = -1; \
2334 else { \
2335 val = simple_strtoul(buf, &cp, 0); \
2336 if (*cp != '\0' && *cp != '\n') \
2337 return -EINVAL; \
2338 session->field = val; \
2339 } \
2340 return count; \
2341}
2342
2343#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2344 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2345 iscsi_priv_session_attr_store(field) \
523f3c80 2346static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2347 show_priv_session_##field, \
2348 store_priv_session_##field)
2349iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2350
1d063c17
MC		 2351static struct attribute *iscsi_session_attrs[] = {
2352 &dev_attr_sess_initial_r2t.attr,
2353 &dev_attr_sess_max_outstanding_r2t.attr,
2354 &dev_attr_sess_immediate_data.attr,
2355 &dev_attr_sess_first_burst_len.attr,
2356 &dev_attr_sess_max_burst_len.attr,
2357 &dev_attr_sess_data_pdu_in_order.attr,
2358 &dev_attr_sess_data_seq_in_order.attr,
2359 &dev_attr_sess_erl.attr,
2360 &dev_attr_sess_targetname.attr,
2361 &dev_attr_sess_tpgt.attr,
2362 &dev_attr_sess_password.attr,
2363 &dev_attr_sess_password_in.attr,
2364 &dev_attr_sess_username.attr,
2365 &dev_attr_sess_username_in.attr,
2366 &dev_attr_sess_fast_abort.attr,
2367 &dev_attr_sess_abort_tmo.attr,
2368 &dev_attr_sess_lu_reset_tmo.attr,
2369 &dev_attr_sess_tgt_reset_tmo.attr,
2370 &dev_attr_sess_ifacename.attr,
2371 &dev_attr_sess_initiatorname.attr,
2372 &dev_attr_sess_targetalias.attr,
2373 &dev_attr_priv_sess_recovery_tmo.attr,
2374 &dev_attr_priv_sess_state.attr,
2375 NULL,
2376};
2377
2378static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2379 struct attribute *attr, int i)
2380{
2381 struct device *cdev = container_of(kobj, struct device, kobj);
2382 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2383 struct iscsi_transport *t = session->transport;
2384 int param;
2385
2386 if (attr == &dev_attr_sess_initial_r2t.attr)
2387 param = ISCSI_PARAM_INITIAL_R2T_EN;
2388 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2389 param = ISCSI_PARAM_MAX_R2T;
2390 else if (attr == &dev_attr_sess_immediate_data.attr)
2391 param = ISCSI_PARAM_IMM_DATA_EN;
2392 else if (attr == &dev_attr_sess_first_burst_len.attr)
2393 param = ISCSI_PARAM_FIRST_BURST;
2394 else if (attr == &dev_attr_sess_max_burst_len.attr)
2395 param = ISCSI_PARAM_MAX_BURST;
2396 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2397 param = ISCSI_PARAM_PDU_INORDER_EN;
2398 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2399 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2400 else if (attr == &dev_attr_sess_erl.attr)
2401 param = ISCSI_PARAM_ERL;
2402 else if (attr == &dev_attr_sess_targetname.attr)
2403 param = ISCSI_PARAM_TARGET_NAME;
2404 else if (attr == &dev_attr_sess_tpgt.attr)
2405 param = ISCSI_PARAM_TPGT;
2406 else if (attr == &dev_attr_sess_password.attr)
2407 param = ISCSI_PARAM_USERNAME;
2408 else if (attr == &dev_attr_sess_password_in.attr)
2409 param = ISCSI_PARAM_USERNAME_IN;
2410 else if (attr == &dev_attr_sess_username.attr)
2411 param = ISCSI_PARAM_PASSWORD;
2412 else if (attr == &dev_attr_sess_username_in.attr)
2413 param = ISCSI_PARAM_PASSWORD_IN;
2414 else if (attr == &dev_attr_sess_fast_abort.attr)
2415 param = ISCSI_PARAM_FAST_ABORT;
2416 else if (attr == &dev_attr_sess_abort_tmo.attr)
2417 param = ISCSI_PARAM_ABORT_TMO;
2418 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2419 param = ISCSI_PARAM_LU_RESET_TMO;
2420 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2421 param = ISCSI_PARAM_TGT_RESET_TMO;
2422 else if (attr == &dev_attr_sess_ifacename.attr)
2423 param = ISCSI_PARAM_IFACE_NAME;
2424 else if (attr == &dev_attr_sess_initiatorname.attr)
2425 param = ISCSI_PARAM_INITIATOR_NAME;
2426 else if (attr == &dev_attr_sess_targetalias.attr)
2427 param = ISCSI_PARAM_TARGET_ALIAS;
2428 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2429 return S_IRUGO | S_IWUSR;
2430 else if (attr == &dev_attr_priv_sess_state.attr)
2431 return S_IRUGO;
2432 else {
2433 WARN_ONCE(1, "Invalid session attr");
2434 return 0;
2435 }
2436
2437 return t->attr_is_visible(ISCSI_PARAM, param);
2438}
2439
2440static struct attribute_group iscsi_session_group = {
2441 .attrs = iscsi_session_attrs,
2442 .is_visible = iscsi_session_attr_is_visible,
2443};
2444
1819dc81
MC		 2445/*
2446 * iSCSI host attrs
2447 */
2448#define iscsi_host_attr_show(param) \
2449static ssize_t \
ee959b00
TJ		 2450show_host_param_##param(struct device *dev, \
2451 struct device_attribute *attr, char *buf) \
1819dc81 2452{ \
ee959b00 2453 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2454 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2455 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2456}
2457
2458#define iscsi_host_attr(field, param) \
2459 iscsi_host_attr_show(param) \
2460static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2461 NULL);
2462
d8196ed2 2463iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2464iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2465iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2466iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 2467
f27fb2ef
MC		 2468static struct attribute *iscsi_host_attrs[] = {
2469 &dev_attr_host_netdev.attr,
2470 &dev_attr_host_hwaddress.attr,
2471 &dev_attr_host_ipaddress.attr,
2472 &dev_attr_host_initiatorname.attr,
2473 NULL,
2474};
2475
2476static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2477 struct attribute *attr, int i)
2478{
2479 struct device *cdev = container_of(kobj, struct device, kobj);
2480 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2481 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2482 int param;
2483
2484 if (attr == &dev_attr_host_netdev.attr)
2485 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2486 else if (attr == &dev_attr_host_hwaddress.attr)
2487 param = ISCSI_HOST_PARAM_HWADDRESS;
2488 else if (attr == &dev_attr_host_ipaddress.attr)
2489 param = ISCSI_HOST_PARAM_IPADDRESS;
2490 else if (attr == &dev_attr_host_initiatorname.attr)
2491 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2492 else {
2493 WARN_ONCE(1, "Invalid host attr");
2494 return 0;
2495 }
2496
2497 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2498}
2499
2500static struct attribute_group iscsi_host_group = {
2501 .attrs = iscsi_host_attrs,
2502 .is_visible = iscsi_host_attr_is_visible,
2503};
1819dc81 2504
0896b752
AA		 2505static int iscsi_session_match(struct attribute_container *cont,
2506 struct device *dev)
1da177e4 2507{
7b8631b5 2508 struct iscsi_cls_session *session;
1da177e4 2509 struct Scsi_Host *shost;
0896b752
AA		 2510 struct iscsi_internal *priv;
2511
2512 if (!iscsi_is_session_dev(dev))
2513 return 0;
1da177e4 2514
7b8631b5
MC		 2515 session = iscsi_dev_to_session(dev);
2516 shost = iscsi_session_to_shost(session);
0896b752 2517 if (!shost->transportt)
1da177e4
LT		 2518 return 0;
2519
0896b752
AA		 2520 priv = to_iscsi_internal(shost->transportt);
2521 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2522 return 0;
2523
0896b752 2524 return &priv->session_cont.ac == cont;
1da177e4
LT		 2525}
2526
0896b752
AA		 2527static int iscsi_conn_match(struct attribute_container *cont,
2528 struct device *dev)
2529{
7b8631b5
MC		 2530 struct iscsi_cls_session *session;
2531 struct iscsi_cls_conn *conn;
1da177e4 2532 struct Scsi_Host *shost;
0896b752 2533 struct iscsi_internal *priv;
1da177e4 2534
0896b752 2535 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2536 return 0;
2537
7b8631b5
MC		 2538 conn = iscsi_dev_to_conn(dev);
2539 session = iscsi_dev_to_session(conn->dev.parent);
2540 shost = iscsi_session_to_shost(session);
2541
0896b752 2542 if (!shost->transportt)
1da177e4
LT		 2543 return 0;
2544
0896b752
AA		 2545 priv = to_iscsi_internal(shost->transportt);
2546 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2547 return 0;
1da177e4 2548
0896b752
AA		 2549 return &priv->conn_cont.ac == cont;
2550}
2551
30a6c652
MC		 2552static int iscsi_host_match(struct attribute_container *cont,
2553 struct device *dev)
2554{
2555 struct Scsi_Host *shost;
2556 struct iscsi_internal *priv;
2557
2558 if (!scsi_is_host_device(dev))
2559 return 0;
2560
2561 shost = dev_to_shost(dev);
2562 if (!shost->transportt ||
2563 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2564 return 0;
2565
2566 priv = to_iscsi_internal(shost->transportt);
2567 return &priv->t.host_attrs.ac == cont;
2568}
2569
7b8631b5
MC		 2570struct scsi_transport_template *
2571iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2572{
2573 struct iscsi_internal *priv;
2574 unsigned long flags;
f27fb2ef 2575 int err;
0896b752
AA		 2576
2577 BUG_ON(!tt);
2578
2579 priv = iscsi_if_transport_lookup(tt);
2580 if (priv)
7b8631b5 2581 return NULL;
0896b752 2582
24669f75 2583 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2584 if (!priv)
7b8631b5 2585 return NULL;
0896b752 2586 INIT_LIST_HEAD(&priv->list);
0896b752 2587 priv->iscsi_transport = tt;
30a6c652 2588 priv->t.user_scan = iscsi_user_scan;
06d25af4 2589 priv->t.create_work_queue = 1;
0896b752 2590
ee959b00 2591 priv->dev.class = &iscsi_transport_class;
71610f55 2592 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2593 err = device_register(&priv->dev);
0896b752
AA		 2594 if (err)
2595 goto free_priv;
2596
ee959b00 2597 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2598 if (err)
ee959b00 2599 goto unregister_dev;
0896b752 2600
30a6c652 2601 /* host parameters */
30a6c652
MC		 2602 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2603 priv->t.host_attrs.ac.match = iscsi_host_match;
f27fb2ef 2604 priv->t.host_attrs.ac.grp = &iscsi_host_group;
32c6e1b9 2605 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2606 transport_container_register(&priv->t.host_attrs);
2607
0896b752 2608 /* connection parameters */
0896b752
AA		 2609 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2610 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2611 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2612 transport_container_register(&priv->conn_cont);
1da177e4 2613
0896b752 2614 /* session parameters */
0896b752
AA		 2615 priv->session_cont.ac.class = &iscsi_session_class.class;
2616 priv->session_cont.ac.match = iscsi_session_match;
1d063c17 2617 priv->session_cont.ac.grp = &iscsi_session_group;
0896b752
AA		 2618 transport_container_register(&priv->session_cont);
2619
0896b752
AA		 2620 spin_lock_irqsave(&iscsi_transport_lock, flags);
2621 list_add(&priv->list, &iscsi_transports);
2622 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2623
2624 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2625 return &priv->t;
1da177e4 2626
ee959b00
TJ		 2627unregister_dev:
2628 device_unregister(&priv->dev);
d82ff9be 2629 return NULL;
0896b752
AA		 2630free_priv:
2631 kfree(priv);
7b8631b5 2632 return NULL;
1da177e4 2633}
0896b752
AA		 2634EXPORT_SYMBOL_GPL(iscsi_register_transport);
2635
2636int iscsi_unregister_transport(struct iscsi_transport *tt)
2637{
2638 struct iscsi_internal *priv;
2639 unsigned long flags;
2640
2641 BUG_ON(!tt);
2642
0b950672 2643 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2644
2645 priv = iscsi_if_transport_lookup(tt);
2646 BUG_ON (!priv);
2647
0896b752
AA		 2648 spin_lock_irqsave(&iscsi_transport_lock, flags);
2649 list_del(&priv->list);
2650 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2651
2652 transport_container_unregister(&priv->conn_cont);
2653 transport_container_unregister(&priv->session_cont);
30a6c652 2654 transport_container_unregister(&priv->t.host_attrs);
0896b752 2655
ee959b00
TJ		 2656 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2657 device_unregister(&priv->dev);
0b950672 2658 mutex_unlock(&rx_queue_mutex);
1da177e4 2659
0896b752
AA		 2660 return 0;
2661}
2662EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2663
1da177e4
LT		 2664static __init int iscsi_transport_init(void)
2665{
0896b752 2666 int err;
1da177e4 2667
09492605 2668 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2669 ISCSI_TRANSPORT_VERSION);
2670
41be1444
MC		 2671 atomic_set(&iscsi_session_nr, 0);
2672
0896b752 2673 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2674 if (err)
2675 return err;
0896b752 2676
d82ff9be 2677 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2678 if (err)
2679 goto unregister_transport_class;
2680
8d07913d 2681 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2682 if (err)
2683 goto unregister_endpoint_class;
2684
8d07913d
MC		 2685 err = transport_class_register(&iscsi_host_class);
2686 if (err)
2687 goto unregister_iface_class;
2688
30a6c652
MC		 2689 err = transport_class_register(&iscsi_connection_class);
2690 if (err)
2691 goto unregister_host_class;
2692
0896b752
AA		 2693 err = transport_class_register(&iscsi_session_class);
2694 if (err)
2695 goto unregister_conn_class;
2696
d82ff9be
MC		 2697 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2698 NULL, THIS_MODULE);
0896b752
AA		 2699 if (!nls) {
2700 err = -ENOBUFS;
43a145a3 2701 goto unregister_session_class;
0896b752
AA		 2702 }
2703
d8bf541e
MC		 2704 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2705 if (!iscsi_eh_timer_workq)
2706 goto release_nls;
2707
43a145a3 2708 return 0;
0896b752 2709
d8bf541e 2710release_nls:
b7c6ba6e 2711 netlink_kernel_release(nls);
0896b752
AA		 2712unregister_session_class:
2713 transport_class_unregister(&iscsi_session_class);
2714unregister_conn_class:
2715 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2716unregister_host_class:
2717 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2718unregister_iface_class:
2719 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2720unregister_endpoint_class:
2721 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2722unregister_transport_class:
2723 class_unregister(&iscsi_transport_class);
2724 return err;
1da177e4
LT		 2725}
2726
2727static void __exit iscsi_transport_exit(void)
2728{
d8bf541e 2729 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2730 netlink_kernel_release(nls);
0896b752
AA		 2731 transport_class_unregister(&iscsi_connection_class);
2732 transport_class_unregister(&iscsi_session_class);
30a6c652 2733 transport_class_unregister(&iscsi_host_class);
d82ff9be 2734 class_unregister(&iscsi_endpoint_class);
8d07913d 2735 class_unregister(&iscsi_iface_class);
0896b752 2736 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2737}
2738
2739module_init(iscsi_transport_init);
2740module_exit(iscsi_transport_exit);
2741
0896b752
AA		 2742MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2743 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2744 "Alex Aizman <itn780@yahoo.com>");
2745MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2746MODULE_LICENSE("GPL");
f4246b33 2747MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 2748MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
Linux kernel - Deliverables
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