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[SCSI] aacraid: use lower snprintf() limit
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / scsi_transport_iscsi.c
CommitLineData
0896b752 1/*
1da177e4
LT		 2 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
0896b752
AA		 5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
1da177e4
LT		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23#include <linux/module.h>
0b950672 24#include <linux/mutex.h>
5a0e3ad6 25#include <linux/slab.h>
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);
8c7d40fb 326iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
fcb5124e 327iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
8d07913d
MC		 328
329static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
330 struct attribute *attr, int i)
331{
332 struct device *dev = container_of(kobj, struct device, kobj);
333 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
334 struct iscsi_transport *t = iface->transport;
b78dbba0 335 int param;
8d07913d
MC		 336
337 if (attr == &dev_attr_iface_enabled.attr)
b78dbba0 338 param = ISCSI_NET_PARAM_IFACE_ENABLE;
8d07913d 339 else if (attr == &dev_attr_iface_vlan.attr)
b78dbba0 340 param = ISCSI_NET_PARAM_VLAN_ID;
4223b9e9
MC		 341 else if (attr == &dev_attr_iface_vlan_priority.attr)
342 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
343 else if (attr == &dev_attr_iface_vlan_enabled.attr)
344 param = ISCSI_NET_PARAM_VLAN_ENABLED;
8c7d40fb
VC		 345 else if (attr == &dev_attr_iface_mtu.attr)
346 param = ISCSI_NET_PARAM_MTU;
fcb5124e
VC		 347 else if (attr == &dev_attr_iface_port.attr)
348 param = ISCSI_NET_PARAM_PORT;
b78dbba0 349 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
8d07913d 350 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
b78dbba0 351 param = ISCSI_NET_PARAM_IPV4_ADDR;
8d07913d 352 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
b78dbba0 353 param = ISCSI_NET_PARAM_IPV4_GW;
8d07913d 354 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
b78dbba0 355 param = ISCSI_NET_PARAM_IPV4_SUBNET;
8d07913d 356 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
b78dbba0
MC		 357 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
358 else
359 return 0;
8d07913d
MC		 360 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
361 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
b78dbba0 362 param = ISCSI_NET_PARAM_IPV6_ADDR;
8d07913d 363 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
b78dbba0 364 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
8d07913d 365 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
b78dbba0 366 param = ISCSI_NET_PARAM_IPV6_ROUTER;
8d07913d 367 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
b78dbba0 368 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
8d07913d 369 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
b78dbba0
MC		 370 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
371 else
372 return 0;
373 } else {
374 WARN_ONCE(1, "Invalid iface attr");
375 return 0;
8d07913d
MC		 376 }
377
b78dbba0 378 return t->attr_is_visible(ISCSI_NET_PARAM, param);
8d07913d
MC		 379}
380
381static struct attribute *iscsi_iface_attrs[] = {
382 &dev_attr_iface_enabled.attr,
383 &dev_attr_iface_vlan.attr,
4223b9e9
MC		 384 &dev_attr_iface_vlan_priority.attr,
385 &dev_attr_iface_vlan_enabled.attr,
8d07913d
MC		 386 &dev_attr_ipv4_iface_ipaddress.attr,
387 &dev_attr_ipv4_iface_gateway.attr,
388 &dev_attr_ipv4_iface_subnet.attr,
389 &dev_attr_ipv4_iface_bootproto.attr,
390 &dev_attr_ipv6_iface_ipaddress.attr,
391 &dev_attr_ipv6_iface_link_local_addr.attr,
392 &dev_attr_ipv6_iface_router_addr.attr,
393 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
394 &dev_attr_ipv6_iface_linklocal_autocfg.attr,
8c7d40fb 395 &dev_attr_iface_mtu.attr,
fcb5124e 396 &dev_attr_iface_port.attr,
8d07913d
MC		 397 NULL,
398};
399
400static struct attribute_group iscsi_iface_group = {
401 .attrs = iscsi_iface_attrs,
402 .is_visible = iscsi_iface_attr_is_visible,
403};
404
405struct iscsi_iface *
406iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
407 uint32_t iface_type, uint32_t iface_num, int dd_size)
408{
409 struct iscsi_iface *iface;
410 int err;
411
412 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
413 if (!iface)
414 return NULL;
415
416 iface->transport = transport;
417 iface->iface_type = iface_type;
418 iface->iface_num = iface_num;
419 iface->dev.release = iscsi_iface_release;
420 iface->dev.class = &iscsi_iface_class;
421 /* parent reference released in iscsi_iface_release */
422 iface->dev.parent = get_device(&shost->shost_gendev);
423 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
424 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
425 iface_num);
426 else
427 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
428 iface_num);
429
430 err = device_register(&iface->dev);
431 if (err)
432 goto free_iface;
433
434 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
435 if (err)
436 goto unreg_iface;
437
438 if (dd_size)
439 iface->dd_data = &iface[1];
440 return iface;
441
442unreg_iface:
443 device_unregister(&iface->dev);
444 return NULL;
445
446free_iface:
447 put_device(iface->dev.parent);
448 kfree(iface);
449 return NULL;
450}
451EXPORT_SYMBOL_GPL(iscsi_create_iface);
452
453void iscsi_destroy_iface(struct iscsi_iface *iface)
454{
455 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
456 device_unregister(&iface->dev);
457}
458EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
459
90eeb01a
MC		 460/*
461 * BSG support
462 */
463/**
464 * iscsi_bsg_host_dispatch - Dispatch command to LLD.
465 * @job: bsg job to be processed
466 */
467static int iscsi_bsg_host_dispatch(struct bsg_job *job)
468{
469 struct Scsi_Host *shost = iscsi_job_to_shost(job);
470 struct iscsi_bsg_request *req = job->request;
471 struct iscsi_bsg_reply *reply = job->reply;
472 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
473 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
474 int ret;
475
476 /* check if we have the msgcode value at least */
477 if (job->request_len < sizeof(uint32_t)) {
478 ret = -ENOMSG;
479 goto fail_host_msg;
480 }
481
482 /* Validate the host command */
483 switch (req->msgcode) {
484 case ISCSI_BSG_HST_VENDOR:
485 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
486 if ((shost->hostt->vendor_id == 0L) ||
487 (req->rqst_data.h_vendor.vendor_id !=
488 shost->hostt->vendor_id)) {
489 ret = -ESRCH;
490 goto fail_host_msg;
491 }
492 break;
493 default:
494 ret = -EBADR;
495 goto fail_host_msg;
496 }
497
498 /* check if we really have all the request data needed */
499 if (job->request_len < cmdlen) {
500 ret = -ENOMSG;
501 goto fail_host_msg;
502 }
503
504 ret = i->iscsi_transport->bsg_request(job);
505 if (!ret)
506 return 0;
507
508fail_host_msg:
509 /* return the errno failure code as the only status */
510 BUG_ON(job->reply_len < sizeof(uint32_t));
511 reply->reply_payload_rcv_len = 0;
512 reply->result = ret;
513 job->reply_len = sizeof(uint32_t);
514 bsg_job_done(job, ret, 0);
515 return 0;
516}
517
518/**
519 * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
520 * @shost: shost for iscsi_host
521 * @cls_host: iscsi_cls_host adding the structures to
522 */
523static int
524iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
525{
526 struct device *dev = &shost->shost_gendev;
527 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
528 struct request_queue *q;
529 char bsg_name[20];
530 int ret;
531
532 if (!i->iscsi_transport->bsg_request)
533 return -ENOTSUPP;
534
535 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
536
537 q = __scsi_alloc_queue(shost, bsg_request_fn);
538 if (!q)
539 return -ENOMEM;
540
541 ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
542 if (ret) {
543 shost_printk(KERN_ERR, shost, "bsg interface failed to "
544 "initialize - no request queue\n");
545 blk_cleanup_queue(q);
546 return ret;
547 }
548
549 ihost->bsg_q = q;
550 return 0;
551}
552
30a6c652 553static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 554 struct device *cdev)
30a6c652
MC		 555{
556 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 557 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 558
559 memset(ihost, 0, sizeof(*ihost));
8aae18ad 560 atomic_set(&ihost->nr_scans, 0);
7970634b 561 mutex_init(&ihost->mutex);
90eeb01a
MC		 562
563 iscsi_bsg_host_add(shost, ihost);
564 /* ignore any bsg add error - we just can't do sgio */
565
566 return 0;
567}
568
569static int iscsi_remove_host(struct transport_container *tc,
570 struct device *dev, struct device *cdev)
571{
572 struct Scsi_Host *shost = dev_to_shost(dev);
573 struct iscsi_cls_host *ihost = shost->shost_data;
574
575 if (ihost->bsg_q) {
576 bsg_remove_queue(ihost->bsg_q);
577 blk_cleanup_queue(ihost->bsg_q);
578 }
30a6c652
MC		 579 return 0;
580}
581
582static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
583 "iscsi_host",
584 iscsi_setup_host,
90eeb01a 585 iscsi_remove_host,
30a6c652
MC		 586 NULL);
587
0896b752
AA		 588static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
589 "iscsi_session",
1da177e4
LT		 590 NULL,
591 NULL,
592 NULL);
593
0896b752
AA		 594static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
595 "iscsi_connection",
1da177e4
LT		 596 NULL,
597 NULL,
598 NULL);
0896b752
AA		 599
600static struct sock *nls;
0b950672 601static DEFINE_MUTEX(rx_queue_mutex);
0896b752 602
7b7232f3
MC		 603static LIST_HEAD(sesslist);
604static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 605static LIST_HEAD(connlist);
606static DEFINE_SPINLOCK(connlock);
0896b752 607
b5c7a12d
MC		 608static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
609{
610 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
611 return sess->sid;
612}
613
614/*
615 * Returns the matching session to a given sid
616 */
617static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 618{
619 unsigned long flags;
620 struct iscsi_cls_session *sess;
621
622 spin_lock_irqsave(&sesslock, flags);
623 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 624 if (sess->sid == sid) {
7b7232f3
MC		 625 spin_unlock_irqrestore(&sesslock, flags);
626 return sess;
627 }
628 }
629 spin_unlock_irqrestore(&sesslock, flags);
630 return NULL;
631}
632
b5c7a12d
MC		 633/*
634 * Returns the matching connection to a given sid / cid tuple
635 */
636static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 637{
638 unsigned long flags;
639 struct iscsi_cls_conn *conn;
640
641 spin_lock_irqsave(&connlock, flags);
642 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 643 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 644 spin_unlock_irqrestore(&connlock, flags);
645 return conn;
646 }
647 }
648 spin_unlock_irqrestore(&connlock, flags);
649 return NULL;
650}
651
7b8631b5
MC		 652/*
653 * The following functions can be used by LLDs that allocate
654 * their own scsi_hosts or by software iscsi LLDs
655 */
6eabafbe
MC		 656static struct {
657 int value;
658 char *name;
659} iscsi_session_state_names[] = {
660 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
661 { ISCSI_SESSION_FAILED, "FAILED" },
662 { ISCSI_SESSION_FREE, "FREE" },
663};
664
3b0f208a 665static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 666{
667 int i;
668 char *name = NULL;
669
670 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
671 if (iscsi_session_state_names[i].value == state) {
672 name = iscsi_session_state_names[i].name;
673 break;
674 }
675 }
676 return name;
677}
678
679int iscsi_session_chkready(struct iscsi_cls_session *session)
680{
681 unsigned long flags;
682 int err;
683
684 spin_lock_irqsave(&session->lock, flags);
685 switch (session->state) {
686 case ISCSI_SESSION_LOGGED_IN:
687 err = 0;
688 break;
689 case ISCSI_SESSION_FAILED:
9a1a69a1 690 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 691 break;
692 case ISCSI_SESSION_FREE:
56d7fcfa 693 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 694 break;
695 default:
696 err = DID_NO_CONNECT << 16;
697 break;
698 }
699 spin_unlock_irqrestore(&session->lock, flags);
700 return err;
701}
702EXPORT_SYMBOL_GPL(iscsi_session_chkready);
703
17fa575e
MR		 704int iscsi_is_session_online(struct iscsi_cls_session *session)
705{
706 unsigned long flags;
707 int ret = 0;
708
709 spin_lock_irqsave(&session->lock, flags);
710 if (session->state == ISCSI_SESSION_LOGGED_IN)
711 ret = 1;
712 spin_unlock_irqrestore(&session->lock, flags);
713 return ret;
714}
715EXPORT_SYMBOL_GPL(iscsi_is_session_online);
716
7b8631b5
MC		 717static void iscsi_session_release(struct device *dev)
718{
719 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 720 struct Scsi_Host *shost;
0896b752 721
7b8631b5
MC		 722 shost = iscsi_session_to_shost(session);
723 scsi_host_put(shost);
632248aa 724 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
7b8631b5 725 kfree(session);
7b8631b5 726}
0896b752 727
7b8631b5
MC		 728static int iscsi_is_session_dev(const struct device *dev)
729{
730 return dev->release == iscsi_session_release;
731}
0896b752 732
a4804cd6
MC		 733static int iscsi_iter_session_fn(struct device *dev, void *data)
734{
735 void (* fn) (struct iscsi_cls_session *) = data;
736
737 if (!iscsi_is_session_dev(dev))
738 return 0;
739 fn(iscsi_dev_to_session(dev));
740 return 0;
741}
742
743void iscsi_host_for_each_session(struct Scsi_Host *shost,
744 void (*fn)(struct iscsi_cls_session *))
745{
746 device_for_each_child(&shost->shost_gendev, fn,
747 iscsi_iter_session_fn);
748}
749EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
750
8aae18ad
MC		 751/**
752 * iscsi_scan_finished - helper to report when running scans are done
753 * @shost: scsi host
754 * @time: scan run time
755 *
756 * This function can be used by drives like qla4xxx to report to the scsi
757 * layer when the scans it kicked off at module load time are done.
758 */
759int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
760{
32c6e1b9 761 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 762 /*
763 * qla4xxx will have kicked off some session unblocks before calling
764 * scsi_scan_host, so just wait for them to complete.
765 */
766 return !atomic_read(&ihost->nr_scans);
767}
768EXPORT_SYMBOL_GPL(iscsi_scan_finished);
769
7970634b
MC		 770struct iscsi_scan_data {
771 unsigned int channel;
772 unsigned int id;
773 unsigned int lun;
774};
775
776static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 777{
7970634b 778 struct iscsi_scan_data *scan_data = data;
30a6c652 779 struct iscsi_cls_session *session;
7970634b
MC		 780 struct Scsi_Host *shost;
781 struct iscsi_cls_host *ihost;
782 unsigned long flags;
783 unsigned int id;
784
785 if (!iscsi_is_session_dev(dev))
786 return 0;
787
788 session = iscsi_dev_to_session(dev);
632248aa
MC		 789
790 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
791
7970634b
MC		 792 shost = iscsi_session_to_shost(session);
793 ihost = shost->shost_data;
30a6c652
MC		 794
795 mutex_lock(&ihost->mutex);
7970634b
MC		 796 spin_lock_irqsave(&session->lock, flags);
797 if (session->state != ISCSI_SESSION_LOGGED_IN) {
798 spin_unlock_irqrestore(&session->lock, flags);
632248aa 799 goto user_scan_exit;
30a6c652 800 }
7970634b
MC		 801 id = session->target_id;
802 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 803
7970634b
MC		 804 if (id != ISCSI_MAX_TARGET) {
805 if ((scan_data->channel == SCAN_WILD_CARD ||
806 scan_data->channel == 0) &&
807 (scan_data->id == SCAN_WILD_CARD ||
808 scan_data->id == id))
809 scsi_scan_target(&session->dev, 0, id,
810 scan_data->lun, 1);
811 }
632248aa
MC		 812
813user_scan_exit:
7970634b 814 mutex_unlock(&ihost->mutex);
632248aa 815 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 816 return 0;
817}
818
7970634b
MC		 819static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
820 uint id, uint lun)
821{
822 struct iscsi_scan_data scan_data;
823
824 scan_data.channel = channel;
825 scan_data.id = id;
826 scan_data.lun = lun;
827
828 return device_for_each_child(&shost->shost_gendev, &scan_data,
829 iscsi_user_scan_session);
830}
831
bd976f62
MC		 832static void iscsi_scan_session(struct work_struct *work)
833{
834 struct iscsi_cls_session *session =
835 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 836 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 837 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 838 struct iscsi_scan_data scan_data;
bd976f62 839
7970634b
MC		 840 scan_data.channel = 0;
841 scan_data.id = SCAN_WILD_CARD;
842 scan_data.lun = SCAN_WILD_CARD;
bd976f62 843
7970634b 844 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 845 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 846}
847
c01be6dc
MC		 848/**
849 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 850 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 851 *
852 * If the session is down this function will wait for the recovery
853 * timer to fire or for the session to be logged back in. If the
854 * recovery timer fires then FAST_IO_FAIL is returned. The caller
855 * should pass this error value to the scsi eh.
856 */
857int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
858{
859 struct iscsi_cls_session *session =
860 starget_to_session(scsi_target(cmd->device));
861 unsigned long flags;
862 int ret = 0;
863
864 spin_lock_irqsave(&session->lock, flags);
865 while (session->state != ISCSI_SESSION_LOGGED_IN) {
866 if (session->state == ISCSI_SESSION_FREE) {
867 ret = FAST_IO_FAIL;
868 break;
869 }
870 spin_unlock_irqrestore(&session->lock, flags);
871 msleep(1000);
872 spin_lock_irqsave(&session->lock, flags);
873 }
874 spin_unlock_irqrestore(&session->lock, flags);
875 return ret;
876}
877EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
878
c4028958 879static void session_recovery_timedout(struct work_struct *work)
30a6c652 880{
c4028958
DH		 881 struct iscsi_cls_session *session =
882 container_of(work, struct iscsi_cls_session,
883 recovery_work.work);
6eabafbe 884 unsigned long flags;
30a6c652 885
322d739d
MC		 886 iscsi_cls_session_printk(KERN_INFO, session,
887 "session recovery timed out after %d secs\n",
888 session->recovery_tmo);
30a6c652 889
6eabafbe
MC		 890 spin_lock_irqsave(&session->lock, flags);
891 switch (session->state) {
892 case ISCSI_SESSION_FAILED:
893 session->state = ISCSI_SESSION_FREE;
894 break;
895 case ISCSI_SESSION_LOGGED_IN:
896 case ISCSI_SESSION_FREE:
897 /* we raced with the unblock's flush */
898 spin_unlock_irqrestore(&session->lock, flags);
899 return;
900 }
901 spin_unlock_irqrestore(&session->lock, flags);
902
30a6c652
MC		 903 if (session->transport->session_recovery_timedout)
904 session->transport->session_recovery_timedout(session);
905
632248aa 906 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
30a6c652 907 scsi_target_unblock(&session->dev);
632248aa 908 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 909}
910
45ab33b6 911static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 912{
45ab33b6
MC		 913 struct iscsi_cls_session *session =
914 container_of(work, struct iscsi_cls_session,
915 unblock_work);
bd976f62 916 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 917 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 918 unsigned long flags;
919
632248aa 920 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 921 /*
922 * The recovery and unblock work get run from the same workqueue,
923 * so try to cancel it if it was going to run after this unblock.
924 */
925 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 926 spin_lock_irqsave(&session->lock, flags);
927 session->state = ISCSI_SESSION_LOGGED_IN;
928 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 929 /* start IO */
930 scsi_target_unblock(&session->dev);
8aae18ad
MC		 931 /*
932 * Only do kernel scanning if the driver is properly hooked into
933 * the async scanning code (drivers like iscsi_tcp do login and
934 * scanning from userspace).
935 */
936 if (shost->hostt->scan_finished) {
06d25af4 937 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 938 atomic_inc(&ihost->nr_scans);
939 }
632248aa 940 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 941}
45ab33b6
MC		 942
943/**
944 * iscsi_unblock_session - set a session as logged in and start IO.
945 * @session: iscsi session
946 *
947 * Mark a session as ready to accept IO.
948 */
949void iscsi_unblock_session(struct iscsi_cls_session *session)
950{
951 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
952 /*
953 * make sure all the events have completed before tell the driver
954 * it is safe
955 */
956 flush_workqueue(iscsi_eh_timer_workq);
957}
30a6c652
MC		 958EXPORT_SYMBOL_GPL(iscsi_unblock_session);
959
45ab33b6 960static void __iscsi_block_session(struct work_struct *work)
30a6c652 961{
45ab33b6
MC		 962 struct iscsi_cls_session *session =
963 container_of(work, struct iscsi_cls_session,
964 block_work);
6eabafbe
MC		 965 unsigned long flags;
966
632248aa 967 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 968 spin_lock_irqsave(&session->lock, flags);
969 session->state = ISCSI_SESSION_FAILED;
970 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 971 scsi_target_block(&session->dev);
632248aa 972 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 973 if (session->recovery_tmo >= 0)
974 queue_delayed_work(iscsi_eh_timer_workq,
975 &session->recovery_work,
976 session->recovery_tmo * HZ);
30a6c652 977}
45ab33b6
MC		 978
979void iscsi_block_session(struct iscsi_cls_session *session)
980{
981 queue_work(iscsi_eh_timer_workq, &session->block_work);
982}
30a6c652
MC		 983EXPORT_SYMBOL_GPL(iscsi_block_session);
984
26974789
MC		 985static void __iscsi_unbind_session(struct work_struct *work)
986{
987 struct iscsi_cls_session *session =
988 container_of(work, struct iscsi_cls_session,
989 unbind_work);
990 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 991 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 992 unsigned long flags;
26974789 993
632248aa
MC		 994 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
995
26974789
MC		 996 /* Prevent new scans and make sure scanning is not in progress */
997 mutex_lock(&ihost->mutex);
7970634b
MC		 998 spin_lock_irqsave(&session->lock, flags);
999 if (session->target_id == ISCSI_MAX_TARGET) {
1000 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 1001 mutex_unlock(&ihost->mutex);
1002 return;
1003 }
7970634b
MC		 1004 session->target_id = ISCSI_MAX_TARGET;
1005 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 1006 mutex_unlock(&ihost->mutex);
1007
1008 scsi_remove_target(&session->dev);
1009 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 1010 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 1011}
1012
7b8631b5 1013struct iscsi_cls_session *
5d91e209
MC		 1014iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1015 int dd_size)
7b8631b5
MC		 1016{
1017 struct iscsi_cls_session *session;
7b8631b5 1018
5d91e209 1019 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 1020 GFP_KERNEL);
7b8631b5 1021 if (!session)
f53a88da
MC		 1022 return NULL;
1023
7b8631b5 1024 session->transport = transport;
30a6c652 1025 session->recovery_tmo = 120;
6eabafbe 1026 session->state = ISCSI_SESSION_FREE;
c4028958 1027 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 1028 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 1029 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1030 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 1031 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 1032 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 1033 spin_lock_init(&session->lock);
7b8631b5 1034
6a8a0d36
MC		 1035 /* this is released in the dev's release function */
1036 scsi_host_get(shost);
8434aa8b
MC		 1037 session->dev.parent = &shost->shost_gendev;
1038 session->dev.release = iscsi_session_release;
1039 device_initialize(&session->dev);
5d91e209 1040 if (dd_size)
b5c7a12d 1041 session->dd_data = &session[1];
632248aa
MC		 1042
1043 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 1044 return session;
1045}
1046EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1047
7970634b
MC		 1048static int iscsi_get_next_target_id(struct device *dev, void *data)
1049{
1050 struct iscsi_cls_session *session;
1051 unsigned long flags;
1052 int err = 0;
1053
1054 if (!iscsi_is_session_dev(dev))
1055 return 0;
1056
1057 session = iscsi_dev_to_session(dev);
1058 spin_lock_irqsave(&session->lock, flags);
1059 if (*((unsigned int *) data) == session->target_id)
1060 err = -EEXIST;
1061 spin_unlock_irqrestore(&session->lock, flags);
1062 return err;
1063}
1064
6a8a0d36 1065int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 1066{
1067 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 1068 struct iscsi_cls_host *ihost;
26974789 1069 unsigned long flags;
7970634b 1070 unsigned int id = target_id;
8434aa8b 1071 int err;
b5c7a12d 1072
30a6c652 1073 ihost = shost->shost_data;
41be1444 1074 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 1075
1076 if (id == ISCSI_MAX_TARGET) {
1077 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
1078 err = device_for_each_child(&shost->shost_gendev, &id,
1079 iscsi_get_next_target_id);
1080 if (!err)
1081 break;
1082 }
1083
1084 if (id == ISCSI_MAX_TARGET) {
1085 iscsi_cls_session_printk(KERN_ERR, session,
1086 "Too many iscsi targets. Max "
1087 "number of targets is %d.\n",
1088 ISCSI_MAX_TARGET - 1);
24add1c4 1089 err = -EOVERFLOW;
7970634b
MC		 1090 goto release_host;
1091 }
1092 }
1093 session->target_id = id;
30a6c652 1094
71610f55 1095 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 1096 err = device_add(&session->dev);
7b8631b5 1097 if (err) {
322d739d
MC		 1098 iscsi_cls_session_printk(KERN_ERR, session,
1099 "could not register session's dev\n");
8434aa8b 1100 goto release_host;
7b8631b5
MC		 1101 }
1102 transport_register_device(&session->dev);
1103
26974789
MC		 1104 spin_lock_irqsave(&sesslock, flags);
1105 list_add(&session->sess_list, &sesslist);
1106 spin_unlock_irqrestore(&sesslock, flags);
1107
26974789 1108 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 1109 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 1110 return 0;
30a6c652 1111
8434aa8b
MC		 1112release_host:
1113 scsi_host_put(shost);
1114 return err;
7b8631b5 1115}
8434aa8b 1116EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 1117
1118/**
8434aa8b
MC		 1119 * iscsi_create_session - create iscsi class session
1120 * @shost: scsi host
1121 * @transport: iscsi transport
5d91e209 1122 * @dd_size: private driver data size
eb44820c 1123 * @target_id: which target
7b8631b5 1124 *
8434aa8b 1125 * This can be called from a LLD or iscsi_transport.
eb44820c 1126 */
8434aa8b 1127struct iscsi_cls_session *
5d91e209
MC		 1128iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1129 int dd_size, unsigned int target_id)
8434aa8b
MC		 1130{
1131 struct iscsi_cls_session *session;
1132
5d91e209 1133 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 1134 if (!session)
1135 return NULL;
1136
6a8a0d36 1137 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1138 iscsi_free_session(session);
1139 return NULL;
1140 }
1141 return session;
1142}
1143EXPORT_SYMBOL_GPL(iscsi_create_session);
1144
26974789
MC		 1145static void iscsi_conn_release(struct device *dev)
1146{
1147 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1148 struct device *parent = conn->dev.parent;
1149
632248aa 1150 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1151 kfree(conn);
1152 put_device(parent);
1153}
1154
1155static int iscsi_is_conn_dev(const struct device *dev)
1156{
1157 return dev->release == iscsi_conn_release;
1158}
1159
1160static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1161{
1162 if (!iscsi_is_conn_dev(dev))
1163 return 0;
1164 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1165}
1166
8434aa8b 1167void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1168{
30a6c652 1169 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1170 unsigned long flags;
1171 int err;
1172
632248aa
MC		 1173 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1174
26974789
MC		 1175 spin_lock_irqsave(&sesslock, flags);
1176 list_del(&session->sess_list);
1177 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1178
45ab33b6
MC		 1179 /* make sure there are no blocks/unblocks queued */
1180 flush_workqueue(iscsi_eh_timer_workq);
1181 /* make sure the timedout callout is not running */
1182 if (!cancel_delayed_work(&session->recovery_work))
1183 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1184 /*
1185 * If we are blocked let commands flow again. The lld or iscsi
1186 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1187 * We assume that LLD will not be calling block/unblock while
1188 * removing the session.
26974789 1189 */
6eabafbe
MC		 1190 spin_lock_irqsave(&session->lock, flags);
1191 session->state = ISCSI_SESSION_FREE;
1192 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1193
45ab33b6
MC		 1194 scsi_target_unblock(&session->dev);
1195 /* flush running scans then delete devices */
06d25af4 1196 scsi_flush_work(shost);
45ab33b6 1197 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1198
26974789
MC		 1199 /* hw iscsi may not have removed all connections from session */
1200 err = device_for_each_child(&session->dev, NULL,
1201 iscsi_iter_destroy_conn_fn);
1202 if (err)
322d739d
MC		 1203 iscsi_cls_session_printk(KERN_ERR, session,
1204 "Could not delete all connections "
1205 "for session. Error %d.\n", err);
8434aa8b 1206
7b8631b5 1207 transport_unregister_device(&session->dev);
632248aa
MC		 1208
1209 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1210 device_del(&session->dev);
1211}
1212EXPORT_SYMBOL_GPL(iscsi_remove_session);
1213
1214void iscsi_free_session(struct iscsi_cls_session *session)
1215{
632248aa 1216 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1217 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1218 put_device(&session->dev);
7b8631b5 1219}
8434aa8b
MC		 1220EXPORT_SYMBOL_GPL(iscsi_free_session);
1221
1222/**
1223 * iscsi_destroy_session - destroy iscsi session
1224 * @session: iscsi_session
1225 *
1226 * Can be called by a LLD or iscsi_transport. There must not be
1227 * any running connections.
eb44820c 1228 */
8434aa8b
MC		 1229int iscsi_destroy_session(struct iscsi_cls_session *session)
1230{
1231 iscsi_remove_session(session);
632248aa 1232 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1233 iscsi_free_session(session);
1234 return 0;
1235}
7b8631b5
MC		 1236EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1237
7b8631b5
MC		 1238/**
1239 * iscsi_create_conn - create iscsi class connection
1240 * @session: iscsi cls session
5d91e209 1241 * @dd_size: private driver data size
7b8631b5
MC		 1242 * @cid: connection id
1243 *
1244 * This can be called from a LLD or iscsi_transport. The connection
1245 * is child of the session so cid must be unique for all connections
1246 * on the session.
b5c7a12d
MC		 1247 *
1248 * Since we do not support MCS, cid will normally be zero. In some cases
1249 * for software iscsi we could be trying to preallocate a connection struct
1250 * in which case there could be two connection structs and cid would be
1251 * non-zero.
eb44820c 1252 */
7b8631b5 1253struct iscsi_cls_conn *
5d91e209 1254iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1255{
1256 struct iscsi_transport *transport = session->transport;
7b8631b5 1257 struct iscsi_cls_conn *conn;
26974789 1258 unsigned long flags;
7b8631b5
MC		 1259 int err;
1260
5d91e209 1261 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1262 if (!conn)
1263 return NULL;
5d91e209 1264 if (dd_size)
7b8631b5
MC		 1265 conn->dd_data = &conn[1];
1266
22a39fbb 1267 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1268 INIT_LIST_HEAD(&conn->conn_list);
1269 conn->transport = transport;
b5c7a12d 1270 conn->cid = cid;
7b8631b5
MC		 1271
1272 /* this is released in the dev's release function */
1273 if (!get_device(&session->dev))
43a145a3 1274 goto free_conn;
b5c7a12d 1275
71610f55 1276 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1277 conn->dev.parent = &session->dev;
1278 conn->dev.release = iscsi_conn_release;
1279 err = device_register(&conn->dev);
1280 if (err) {
322d739d
MC		 1281 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1282 "register connection's dev\n");
7b8631b5
MC		 1283 goto release_parent_ref;
1284 }
1285 transport_register_device(&conn->dev);
26974789
MC		 1286
1287 spin_lock_irqsave(&connlock, flags);
1288 list_add(&conn->conn_list, &connlist);
26974789 1289 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1290
1291 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1292 return conn;
1293
1294release_parent_ref:
1295 put_device(&session->dev);
1296free_conn:
1297 kfree(conn);
1298 return NULL;
1299}
1300
1301EXPORT_SYMBOL_GPL(iscsi_create_conn);
1302
1303/**
1304 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1305 * @conn: iscsi cls session
7b8631b5 1306 *
26974789 1307 * This can be called from a LLD or iscsi_transport.
eb44820c 1308 */
7b8631b5
MC		 1309int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1310{
26974789
MC		 1311 unsigned long flags;
1312
1313 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1314 list_del(&conn->conn_list);
1315 spin_unlock_irqrestore(&connlock, flags);
1316
7b8631b5 1317 transport_unregister_device(&conn->dev);
632248aa 1318 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1319 device_unregister(&conn->dev);
1320 return 0;
1321}
7b8631b5
MC		 1322EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1323
7b8631b5
MC		 1324/*
1325 * iscsi interface functions
1326 */
0896b752
AA		 1327static struct iscsi_internal *
1328iscsi_if_transport_lookup(struct iscsi_transport *tt)
1329{
1330 struct iscsi_internal *priv;
1331 unsigned long flags;
1332
1333 spin_lock_irqsave(&iscsi_transport_lock, flags);
1334 list_for_each_entry(priv, &iscsi_transports, list) {
1335 if (tt == priv->iscsi_transport) {
1336 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1337 return priv;
1338 }
1339 }
1340 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1341 return NULL;
1342}
1da177e4 1343
53cb8a1f 1344static int
43514774 1345iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1346{
43514774 1347 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1348}
1da177e4 1349
7b7232f3 1350int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1351 char *data, uint32_t data_size)
1da177e4 1352{
0896b752
AA		 1353 struct nlmsghdr *nlh;
1354 struct sk_buff *skb;
1355 struct iscsi_uevent *ev;
0896b752 1356 char *pdu;
790f39a2 1357 struct iscsi_internal *priv;
0896b752
AA		 1358 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1359 data_size);
1360
790f39a2
MC		 1361 priv = iscsi_if_transport_lookup(conn->transport);
1362 if (!priv)
1363 return -EINVAL;
1364
43a145a3 1365 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1366 if (!skb) {
e5bd7b54 1367 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1368 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1369 "control PDU: OOM\n");
0896b752
AA		 1370 return -ENOMEM;
1371 }
1da177e4 1372
43514774 1373 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1374 ev = NLMSG_DATA(nlh);
1375 memset(ev, 0, sizeof(*ev));
1376 ev->transport_handle = iscsi_handle(conn->transport);
1377 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1378 ev->r.recv_req.cid = conn->cid;
1379 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1380 pdu = (char*)ev + sizeof(*ev);
1381 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1382 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1383
43514774 1384 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1385}
0896b752 1386EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1387
43514774
MC		 1388int iscsi_offload_mesg(struct Scsi_Host *shost,
1389 struct iscsi_transport *transport, uint32_t type,
1390 char *data, uint16_t data_size)
1391{
1392 struct nlmsghdr *nlh;
1393 struct sk_buff *skb;
1394 struct iscsi_uevent *ev;
1395 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1396
a541f840 1397 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1398 if (!skb) {
1399 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1400 return -ENOMEM;
1401 }
1402
1403 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1404 ev = NLMSG_DATA(nlh);
1405 memset(ev, 0, sizeof(*ev));
1406 ev->type = type;
1407 ev->transport_handle = iscsi_handle(transport);
1408 switch (type) {
1409 case ISCSI_KEVENT_PATH_REQ:
1410 ev->r.req_path.host_no = shost->host_no;
1411 break;
1412 case ISCSI_KEVENT_IF_DOWN:
1413 ev->r.notify_if_down.host_no = shost->host_no;
1414 break;
1415 }
1416
1417 memcpy((char *)ev + sizeof(*ev), data, data_size);
1418
a541f840 1419 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1420}
1421EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1422
e5bd7b54 1423void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1424{
0896b752
AA		 1425 struct nlmsghdr *nlh;
1426 struct sk_buff *skb;
1427 struct iscsi_uevent *ev;
790f39a2 1428 struct iscsi_internal *priv;
0896b752
AA		 1429 int len = NLMSG_SPACE(sizeof(*ev));
1430
790f39a2
MC		 1431 priv = iscsi_if_transport_lookup(conn->transport);
1432 if (!priv)
1433 return;
1434
43a145a3 1435 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1436 if (!skb) {
322d739d
MC		 1437 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1438 "conn error (%d)\n", error);
0896b752
AA		 1439 return;
1440 }
1441
43514774 1442 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1443 ev = NLMSG_DATA(nlh);
1444 ev->transport_handle = iscsi_handle(conn->transport);
1445 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1446 ev->r.connerror.error = error;
b5c7a12d
MC		 1447 ev->r.connerror.cid = conn->cid;
1448 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1449
43514774 1450 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1451
322d739d
MC		 1452 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1453 error);
0896b752 1454}
e5bd7b54 1455EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752 1456
17fa575e
MR		 1457void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1458 enum iscsi_conn_state state)
1459{
1460 struct nlmsghdr *nlh;
1461 struct sk_buff *skb;
1462 struct iscsi_uevent *ev;
1463 struct iscsi_internal *priv;
1464 int len = NLMSG_SPACE(sizeof(*ev));
1465
1466 priv = iscsi_if_transport_lookup(conn->transport);
1467 if (!priv)
1468 return;
1469
1470 skb = alloc_skb(len, GFP_ATOMIC);
1471 if (!skb) {
1472 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1473 "conn login (%d)\n", state);
1474 return;
1475 }
1476
1477 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1478 ev = NLMSG_DATA(nlh);
1479 ev->transport_handle = iscsi_handle(conn->transport);
1480 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1481 ev->r.conn_login.state = state;
1482 ev->r.conn_login.cid = conn->cid;
1483 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1484 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1485
1486 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1487 state);
1488}
1489EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1490
0896b752 1491static int
43514774
MC		 1492iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1493 void *payload, int size)
0896b752
AA		 1494{
1495 struct sk_buff *skb;
1496 struct nlmsghdr *nlh;
1497 int len = NLMSG_SPACE(size);
1498 int flags = multi ? NLM_F_MULTI : 0;
1499 int t = done ? NLMSG_DONE : type;
1500
43a145a3 1501 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1502 if (!skb) {
1503 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1504 return -ENOMEM;
1505 }
0896b752 1506
43514774 1507 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1508 nlh->nlmsg_flags = flags;
1509 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1510 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1511}
1da177e4 1512
7b8631b5 1513static int
5b940adf 1514iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1515{
1516 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1517 struct iscsi_stats *stats;
1518 struct sk_buff *skbstat;
1519 struct iscsi_cls_conn *conn;
1520 struct nlmsghdr *nlhstat;
1521 struct iscsi_uevent *evstat;
790f39a2 1522 struct iscsi_internal *priv;
7b8631b5
MC		 1523 int len = NLMSG_SPACE(sizeof(*ev) +
1524 sizeof(struct iscsi_stats) +
1525 sizeof(struct iscsi_stats_custom) *
1526 ISCSI_STATS_CUSTOM_MAX);
1527 int err = 0;
0896b752 1528
790f39a2
MC		 1529 priv = iscsi_if_transport_lookup(transport);
1530 if (!priv)
1531 return -EINVAL;
1532
b5c7a12d 1533 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1534 if (!conn)
1535 return -EEXIST;
0896b752 1536
7b8631b5
MC		 1537 do {
1538 int actual_size;
0896b752 1539
43a145a3 1540 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1541 if (!skbstat) {
322d739d
MC		 1542 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1543 "deliver stats: OOM\n");
7b8631b5
MC		 1544 return -ENOMEM;
1545 }
1546
43514774 1547 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1548 (len - sizeof(*nlhstat)), 0);
1549 evstat = NLMSG_DATA(nlhstat);
1550 memset(evstat, 0, sizeof(*evstat));
1551 evstat->transport_handle = iscsi_handle(conn->transport);
1552 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1553 evstat->u.get_stats.cid =
1554 ev->u.get_stats.cid;
1555 evstat->u.get_stats.sid =
1556 ev->u.get_stats.sid;
7b8631b5
MC		 1557 stats = (struct iscsi_stats *)
1558 ((char*)evstat + sizeof(*evstat));
1559 memset(stats, 0, sizeof(*stats));
1560
7b7232f3 1561 transport->get_stats(conn, stats);
7b8631b5
MC		 1562 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1563 sizeof(struct iscsi_stats) +
1564 sizeof(struct iscsi_stats_custom) *
1565 stats->custom_length);
1566 actual_size -= sizeof(*nlhstat);
1567 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1568 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1569 nlhstat->nlmsg_len = actual_size;
1570
43514774
MC		 1571 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1572 GFP_ATOMIC);
7b8631b5
MC		 1573 } while (err < 0 && err != -ECONNREFUSED);
1574
1575 return err;
0896b752
AA		 1576}
1577
53cb8a1f 1578/**
26974789
MC		 1579 * iscsi_session_event - send session destr. completion event
1580 * @session: iscsi class session
1581 * @event: type of event
eb44820c 1582 */
26974789
MC		 1583int iscsi_session_event(struct iscsi_cls_session *session,
1584 enum iscsi_uevent_e event)
53cb8a1f
MC		 1585{
1586 struct iscsi_internal *priv;
53cb8a1f
MC		 1587 struct Scsi_Host *shost;
1588 struct iscsi_uevent *ev;
1589 struct sk_buff *skb;
1590 struct nlmsghdr *nlh;
53cb8a1f
MC		 1591 int rc, len = NLMSG_SPACE(sizeof(*ev));
1592
26974789 1593 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1594 if (!priv)
1595 return -EINVAL;
53cb8a1f
MC		 1596 shost = iscsi_session_to_shost(session);
1597
43a145a3 1598 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1599 if (!skb) {
322d739d
MC		 1600 iscsi_cls_session_printk(KERN_ERR, session,
1601 "Cannot notify userspace of session "
1602 "event %u\n", event);
53cb8a1f
MC		 1603 return -ENOMEM;
1604 }
1605
43514774 1606 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1607 ev = NLMSG_DATA(nlh);
26974789 1608 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1609
26974789
MC		 1610 ev->type = event;
1611 switch (event) {
1612 case ISCSI_KEVENT_DESTROY_SESSION:
1613 ev->r.d_session.host_no = shost->host_no;
1614 ev->r.d_session.sid = session->sid;
1615 break;
1616 case ISCSI_KEVENT_CREATE_SESSION:
1617 ev->r.c_session_ret.host_no = shost->host_no;
1618 ev->r.c_session_ret.sid = session->sid;
1619 break;
1620 case ISCSI_KEVENT_UNBIND_SESSION:
1621 ev->r.unbind_session.host_no = shost->host_no;
1622 ev->r.unbind_session.sid = session->sid;
1623 break;
1624 default:
322d739d
MC		 1625 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1626 "%u.\n", event);
26974789 1627 kfree_skb(skb);
53cb8a1f 1628 return -EINVAL;
53cb8a1f
MC		 1629 }
1630
53cb8a1f
MC		 1631 /*
1632 * this will occur if the daemon is not up, so we just warn
1633 * the user and when the daemon is restarted it will handle it
1634 */
43514774 1635 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1636 if (rc == -ESRCH)
322d739d
MC		 1637 iscsi_cls_session_printk(KERN_ERR, session,
1638 "Cannot notify userspace of session "
1639 "event %u. Check iscsi daemon\n",
1640 event);
632248aa
MC		 1641
1642 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1643 event, rc);
53cb8a1f
MC		 1644 return rc;
1645}
26974789 1646EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1647
0896b752 1648static int
d82ff9be
MC		 1649iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1650 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1651 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1652{
1653 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1654 struct iscsi_cls_session *session;
5e7facb7 1655 struct Scsi_Host *shost;
0896b752 1656
d82ff9be 1657 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1658 initial_cmdsn);
7b7232f3 1659 if (!session)
7b8631b5 1660 return -ENOMEM;
0896b752 1661
5e7facb7
MC		 1662 shost = iscsi_session_to_shost(session);
1663 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1664 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1665 ISCSI_DBG_TRANS_SESSION(session,
1666 "Completed creating transport session\n");
0896b752 1667 return 0;
0896b752
AA		 1668}
1669
1670static int
7b7232f3 1671iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1672{
7b8631b5 1673 struct iscsi_cls_conn *conn;
7b7232f3 1674 struct iscsi_cls_session *session;
7b8631b5 1675
b5c7a12d
MC		 1676 session = iscsi_session_lookup(ev->u.c_conn.sid);
1677 if (!session) {
322d739d 1678 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1679 ev->u.c_conn.sid);
7b8631b5 1680 return -EINVAL;
b5c7a12d 1681 }
0896b752 1682
7b7232f3 1683 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1684 if (!conn) {
322d739d
MC		 1685 iscsi_cls_session_printk(KERN_ERR, session,
1686 "couldn't create a new connection.");
7b7232f3 1687 return -ENOMEM;
b5c7a12d 1688 }
0896b752 1689
b5c7a12d
MC		 1690 ev->r.c_conn_ret.sid = session->sid;
1691 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1692
1693 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1694 return 0;
1da177e4
LT		 1695}
1696
0896b752
AA		 1697static int
1698iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1699{
7b8631b5 1700 struct iscsi_cls_conn *conn;
0896b752 1701
b5c7a12d 1702 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1703 if (!conn)
7b8631b5 1704 return -EINVAL;
0896b752 1705
632248aa 1706 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1707 if (transport->destroy_conn)
1708 transport->destroy_conn(conn);
632248aa 1709
7b8631b5 1710 return 0;
0896b752
AA		 1711}
1712
fd7255f5
MC		 1713static int
1714iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1715{
1716 char *data = (char*)ev + sizeof(*ev);
1717 struct iscsi_cls_conn *conn;
1718 struct iscsi_cls_session *session;
a54a52ca 1719 int err = 0, value = 0;
fd7255f5
MC		 1720
1721 session = iscsi_session_lookup(ev->u.set_param.sid);
1722 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1723 if (!conn || !session)
1724 return -EINVAL;
1725
1726 switch (ev->u.set_param.param) {
30a6c652 1727 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1728 sscanf(data, "%d", &value);
fdd46dcb 1729 session->recovery_tmo = value;
30a6c652 1730 break;
fd7255f5 1731 default:
a54a52ca
MC		 1732 err = transport->set_param(conn, ev->u.set_param.param,
1733 data, ev->u.set_param.len);
fd7255f5
MC		 1734 }
1735
1736 return err;
1737}
1738
10eb0f01
MC		 1739static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1740 struct iscsi_uevent *ev, int msg_type)
1741{
1742 struct iscsi_endpoint *ep;
1743 struct sockaddr *dst_addr;
1744 struct Scsi_Host *shost = NULL;
1745 int non_blocking, err = 0;
1746
1747 if (!transport->ep_connect)
1748 return -EINVAL;
1749
1750 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1751 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1752 if (!shost) {
1753 printk(KERN_ERR "ep connect failed. Could not find "
1754 "host no %u\n",
1755 ev->u.ep_connect_through_host.host_no);
1756 return -ENODEV;
1757 }
1758 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1759 } else
1760 non_blocking = ev->u.ep_connect.non_blocking;
1761
1762 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1763 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1764 if (IS_ERR(ep)) {
1765 err = PTR_ERR(ep);
1766 goto release_host;
1767 }
1768
1769 ev->r.ep_connect_ret.handle = ep->id;
1770release_host:
1771 if (shost)
1772 scsi_host_put(shost);
1773 return err;
1774}
1775
22a39fbb
MC		 1776static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1777 u64 ep_handle)
1778{
1779 struct iscsi_cls_conn *conn;
1780 struct iscsi_endpoint *ep;
1781
1782 if (!transport->ep_disconnect)
1783 return -EINVAL;
1784
1785 ep = iscsi_lookup_endpoint(ep_handle);
1786 if (!ep)
1787 return -EINVAL;
1788 conn = ep->conn;
1789 if (conn) {
1790 mutex_lock(&conn->ep_mutex);
1791 conn->ep = NULL;
1792 mutex_unlock(&conn->ep_mutex);
1793 }
1794
1795 transport->ep_disconnect(ep);
1796 return 0;
1797}
1798
264faaaa
OG		 1799static int
1800iscsi_if_transport_ep(struct iscsi_transport *transport,
1801 struct iscsi_uevent *ev, int msg_type)
1802{
d82ff9be 1803 struct iscsi_endpoint *ep;
264faaaa
OG		 1804 int rc = 0;
1805
1806 switch (msg_type) {
10eb0f01 1807 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1808 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1809 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1810 break;
1811 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1812 if (!transport->ep_poll)
1813 return -EINVAL;
1814
d82ff9be
MC		 1815 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1816 if (!ep)
1817 return -EINVAL;
1818
1819 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1820 ev->u.ep_poll.timeout_ms);
1821 break;
1822 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1823 rc = iscsi_if_ep_disconnect(transport,
1824 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1825 break;
1826 }
1827 return rc;
1828}
1829
01cb225d
MC		 1830static int
1831iscsi_tgt_dscvr(struct iscsi_transport *transport,
1832 struct iscsi_uevent *ev)
1833{
2174a04e 1834 struct Scsi_Host *shost;
01cb225d 1835 struct sockaddr *dst_addr;
2174a04e 1836 int err;
01cb225d
MC		 1837
1838 if (!transport->tgt_dscvr)
1839 return -EINVAL;
1840
2174a04e 1841 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1842 if (!shost) {
2174a04e
MC		 1843 printk(KERN_ERR "target discovery could not find host no %u\n",
1844 ev->u.tgt_dscvr.host_no);
1845 return -ENODEV;
1846 }
1847
1848
01cb225d 1849 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1850 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1851 ev->u.tgt_dscvr.enable, dst_addr);
1852 scsi_host_put(shost);
1853 return err;
01cb225d
MC		 1854}
1855
1d9bf13a
MC		 1856static int
1857iscsi_set_host_param(struct iscsi_transport *transport,
1858 struct iscsi_uevent *ev)
1859{
1860 char *data = (char*)ev + sizeof(*ev);
1861 struct Scsi_Host *shost;
1862 int err;
1863
1864 if (!transport->set_host_param)
1865 return -ENOSYS;
1866
1867 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1868 if (!shost) {
1d9bf13a
MC		 1869 printk(KERN_ERR "set_host_param could not find host no %u\n",
1870 ev->u.set_host_param.host_no);
1871 return -ENODEV;
1872 }
1873
1874 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1875 data, ev->u.set_host_param.len);
1876 scsi_host_put(shost);
1877 return err;
1878}
1879
0896b752 1880static int
43514774
MC		 1881iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1882{
1883 struct Scsi_Host *shost;
1884 struct iscsi_path *params;
1885 int err;
1886
1887 if (!transport->set_path)
1888 return -ENOSYS;
1889
1890 shost = scsi_host_lookup(ev->u.set_path.host_no);
1891 if (!shost) {
1892 printk(KERN_ERR "set path could not find host no %u\n",
1893 ev->u.set_path.host_no);
1894 return -ENODEV;
1895 }
1896
1897 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1898 err = transport->set_path(shost, params);
1899
1900 scsi_host_put(shost);
1901 return err;
1902}
1903
56c155b5
MC		 1904static int
1905iscsi_set_iface_params(struct iscsi_transport *transport,
1906 struct iscsi_uevent *ev)
1907{
1908 char *data = (char *)ev + sizeof(*ev);
1909 struct Scsi_Host *shost;
1910 int err;
1911
1912 if (!transport->set_iface_param)
1913 return -ENOSYS;
1914
1915 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1916 if (!shost) {
1917 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1918 ev->u.set_iface_params.host_no);
1919 return -ENODEV;
1920 }
1921
1922 err = transport->set_iface_param(shost, data,
1923 ev->u.set_iface_params.count);
1924 scsi_host_put(shost);
1925 return err;
1926}
1927
43514774
MC		 1928static int
1929iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 1930{
1931 int err = 0;
1932 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1933 struct iscsi_transport *transport = NULL;
1934 struct iscsi_internal *priv;
7b7232f3
MC		 1935 struct iscsi_cls_session *session;
1936 struct iscsi_cls_conn *conn;
d82ff9be 1937 struct iscsi_endpoint *ep = NULL;
0896b752 1938
43514774
MC		 1939 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1940 *group = ISCSI_NL_GRP_UIP;
1941 else
1942 *group = ISCSI_NL_GRP_ISCSID;
1943
0896b752
AA		 1944 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1945 if (!priv)
1946 return -EINVAL;
1947 transport = priv->iscsi_transport;
1948
7b7232f3
MC		 1949 if (!try_module_get(transport->owner))
1950 return -EINVAL;
1951
0896b752
AA		 1952 switch (nlh->nlmsg_type) {
1953 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1954 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1955 ev->u.c_session.initial_cmdsn,
1956 ev->u.c_session.cmds_max,
1957 ev->u.c_session.queue_depth);
1958 break;
1959 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1960 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1961 if (!ep) {
1962 err = -EINVAL;
1963 break;
1964 }
d82ff9be
MC		 1965
1966 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1967 ev->u.c_bound_session.initial_cmdsn,
1968 ev->u.c_bound_session.cmds_max,
1969 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1970 break;
1971 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1972 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1973 if (session)
7b7232f3 1974 transport->destroy_session(session);
26974789
MC		 1975 else
1976 err = -EINVAL;
1977 break;
1978 case ISCSI_UEVENT_UNBIND_SESSION:
1979 session = iscsi_session_lookup(ev->u.d_session.sid);
1980 if (session)
06d25af4
MC		 1981 scsi_queue_work(iscsi_session_to_shost(session),
1982 &session->unbind_work);
26974789 1983 else
7b7232f3 1984 err = -EINVAL;
0896b752
AA		 1985 break;
1986 case ISCSI_UEVENT_CREATE_CONN:
1987 err = iscsi_if_create_conn(transport, ev);
1988 break;
1989 case ISCSI_UEVENT_DESTROY_CONN:
1990 err = iscsi_if_destroy_conn(transport, ev);
1991 break;
1992 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1993 session = iscsi_session_lookup(ev->u.b_conn.sid);
1994 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 1995
22a39fbb
MC		 1996 if (conn && conn->ep)
1997 iscsi_if_ep_disconnect(transport, conn->ep->id);
1998
1999 if (!session || !conn) {
7b7232f3 2000 err = -EINVAL;
22a39fbb
MC		 2001 break;
2002 }
2003
2004 ev->r.retcode = transport->bind_conn(session, conn,
2005 ev->u.b_conn.transport_eph,
2006 ev->u.b_conn.is_leading);
2007 if (ev->r.retcode || !transport->ep_connect)
2008 break;
2009
2010 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2011 if (ep) {
2012 ep->conn = conn;
2013
2014 mutex_lock(&conn->ep_mutex);
2015 conn->ep = ep;
2016 mutex_unlock(&conn->ep_mutex);
2017 } else
2018 iscsi_cls_conn_printk(KERN_ERR, conn,
2019 "Could not set ep conn "
2020 "binding\n");
0896b752
AA		 2021 break;
2022 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 2023 err = iscsi_set_param(transport, ev);
0896b752
AA		 2024 break;
2025 case ISCSI_UEVENT_START_CONN:
b5c7a12d 2026 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 2027 if (conn)
2028 ev->r.retcode = transport->start_conn(conn);
2029 else
2030 err = -EINVAL;
0896b752
AA		 2031 break;
2032 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 2033 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 2034 if (conn)
2035 transport->stop_conn(conn, ev->u.stop_conn.flag);
2036 else
2037 err = -EINVAL;
0896b752
AA		 2038 break;
2039 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 2040 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 2041 if (conn)
2042 ev->r.retcode = transport->send_pdu(conn,
2043 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2044 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2045 ev->u.send_pdu.data_size);
2046 else
2047 err = -EINVAL;
0896b752
AA		 2048 break;
2049 case ISCSI_UEVENT_GET_STATS:
5b940adf 2050 err = iscsi_if_get_stats(transport, nlh);
0896b752 2051 break;
264faaaa
OG		 2052 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2053 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2054 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 2055 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 2056 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2057 break;
01cb225d
MC		 2058 case ISCSI_UEVENT_TGT_DSCVR:
2059 err = iscsi_tgt_dscvr(transport, ev);
2060 break;
1d9bf13a
MC		 2061 case ISCSI_UEVENT_SET_HOST_PARAM:
2062 err = iscsi_set_host_param(transport, ev);
2063 break;
43514774
MC		 2064 case ISCSI_UEVENT_PATH_UPDATE:
2065 err = iscsi_set_path(transport, ev);
2066 break;
56c155b5
MC		 2067 case ISCSI_UEVENT_SET_IFACE_PARAMS:
2068 err = iscsi_set_iface_params(transport, ev);
2069 break;
0896b752 2070 default:
1d9bf13a 2071 err = -ENOSYS;
0896b752
AA		 2072 break;
2073 }
2074
7b7232f3 2075 module_put(transport->owner);
0896b752
AA		 2076 return err;
2077}
2078
b5c7a12d 2079/*
cd40b7d3
DL		 2080 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
2081 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 2082 */
0896b752 2083static void
cd40b7d3 2084iscsi_if_rx(struct sk_buff *skb)
0896b752 2085{
0b950672 2086 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 2087 while (skb->len >= NLMSG_SPACE(0)) {
2088 int err;
2089 uint32_t rlen;
2090 struct nlmsghdr *nlh;
2091 struct iscsi_uevent *ev;
43514774 2092 uint32_t group;
cd40b7d3
DL		 2093
2094 nlh = nlmsg_hdr(skb);
2095 if (nlh->nlmsg_len < sizeof(*nlh) ||
2096 skb->len < nlh->nlmsg_len) {
2097 break;
ee7f8e40 2098 }
ee7f8e40 2099
cd40b7d3
DL		 2100 ev = NLMSG_DATA(nlh);
2101 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2102 if (rlen > skb->len)
2103 rlen = skb->len;
0896b752 2104
43514774 2105 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 2106 if (err) {
2107 ev->type = ISCSI_KEVENT_IF_ERROR;
2108 ev->iferror = err;
0896b752 2109 }
cd40b7d3
DL		 2110 do {
2111 /*
2112 * special case for GET_STATS:
2113 * on success - sending reply and stats from
2114 * inside of if_recv_msg(),
2115 * on error - fall through.
2116 */
2117 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2118 break;
43514774 2119 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3
DL		 2120 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2121 } while (err < 0 && err != -ECONNREFUSED);
2122 skb_pull(skb, rlen);
0896b752 2123 }
0b950672 2124 mutex_unlock(&rx_queue_mutex);
0896b752 2125}
1da177e4 2126
fd7255f5 2127#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 2128struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 2129 __ATTR(_name,_mode,_show,_store)
2130
1da177e4 2131/*
0896b752 2132 * iSCSI connection attrs
1da177e4 2133 */
a54a52ca 2134#define iscsi_conn_attr_show(param) \
0896b752 2135static ssize_t \
ee959b00
TJ		 2136show_conn_param_##param(struct device *dev, \
2137 struct device_attribute *attr, char *buf) \
0896b752 2138{ \
ee959b00 2139 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 2140 struct iscsi_transport *t = conn->transport; \
a54a52ca 2141 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 2142}
2143
a54a52ca
MC		 2144#define iscsi_conn_attr(field, param) \
2145 iscsi_conn_attr_show(param) \
2146static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 2147 NULL);
0896b752 2148
a54a52ca
MC		 2149iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2150iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2151iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2152iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2153iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2154iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2155iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 2156iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2157iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 2158iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2159iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 2160
289324b0
MC		 2161#define iscsi_conn_ep_attr_show(param) \
2162static ssize_t show_conn_ep_param_##param(struct device *dev, \
2163 struct device_attribute *attr,\
2164 char *buf) \
2165{ \
2166 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2167 struct iscsi_transport *t = conn->transport; \
2168 struct iscsi_endpoint *ep; \
2169 ssize_t rc; \
2170 \
2171 /* \
2172 * Need to make sure ep_disconnect does not free the LLD's \
2173 * interconnect resources while we are trying to read them. \
2174 */ \
2175 mutex_lock(&conn->ep_mutex); \
2176 ep = conn->ep; \
2177 if (!ep && t->ep_connect) { \
2178 mutex_unlock(&conn->ep_mutex); \
2179 return -ENOTCONN; \
2180 } \
2181 \
2182 if (ep) \
2183 rc = t->get_ep_param(ep, param, buf); \
2184 else \
2185 rc = t->get_conn_param(conn, param, buf); \
2186 mutex_unlock(&conn->ep_mutex); \
2187 return rc; \
2188}
2189
2190#define iscsi_conn_ep_attr(field, param) \
2191 iscsi_conn_ep_attr_show(param) \
2192static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2193 show_conn_ep_param_##param, NULL);
2194
2195iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2196iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2197
3128c6c7
MC		 2198static struct attribute *iscsi_conn_attrs[] = {
2199 &dev_attr_conn_max_recv_dlength.attr,
2200 &dev_attr_conn_max_xmit_dlength.attr,
2201 &dev_attr_conn_header_digest.attr,
2202 &dev_attr_conn_data_digest.attr,
2203 &dev_attr_conn_ifmarker.attr,
2204 &dev_attr_conn_ofmarker.attr,
2205 &dev_attr_conn_address.attr,
2206 &dev_attr_conn_port.attr,
2207 &dev_attr_conn_exp_statsn.attr,
2208 &dev_attr_conn_persistent_address.attr,
2209 &dev_attr_conn_persistent_port.attr,
2210 &dev_attr_conn_ping_tmo.attr,
2211 &dev_attr_conn_recv_tmo.attr,
2212 NULL,
2213};
2214
2215static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2216 struct attribute *attr, int i)
2217{
2218 struct device *cdev = container_of(kobj, struct device, kobj);
2219 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2220 struct iscsi_transport *t = conn->transport;
2221 int param;
2222
2223 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2224 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2225 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2226 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2227 else if (attr == &dev_attr_conn_header_digest.attr)
2228 param = ISCSI_PARAM_HDRDGST_EN;
2229 else if (attr == &dev_attr_conn_data_digest.attr)
2230 param = ISCSI_PARAM_DATADGST_EN;
2231 else if (attr == &dev_attr_conn_ifmarker.attr)
2232 param = ISCSI_PARAM_IFMARKER_EN;
2233 else if (attr == &dev_attr_conn_ofmarker.attr)
2234 param = ISCSI_PARAM_OFMARKER_EN;
2235 else if (attr == &dev_attr_conn_address.attr)
2236 param = ISCSI_PARAM_CONN_ADDRESS;
2237 else if (attr == &dev_attr_conn_port.attr)
2238 param = ISCSI_PARAM_CONN_PORT;
2239 else if (attr == &dev_attr_conn_exp_statsn.attr)
2240 param = ISCSI_PARAM_EXP_STATSN;
2241 else if (attr == &dev_attr_conn_persistent_address.attr)
2242 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2243 else if (attr == &dev_attr_conn_persistent_port.attr)
2244 param = ISCSI_PARAM_PERSISTENT_PORT;
2245 else if (attr == &dev_attr_conn_ping_tmo.attr)
2246 param = ISCSI_PARAM_PING_TMO;
2247 else if (attr == &dev_attr_conn_recv_tmo.attr)
2248 param = ISCSI_PARAM_RECV_TMO;
2249 else {
2250 WARN_ONCE(1, "Invalid conn attr");
2251 return 0;
2252 }
2253
2254 return t->attr_is_visible(ISCSI_PARAM, param);
2255}
2256
2257static struct attribute_group iscsi_conn_group = {
2258 .attrs = iscsi_conn_attrs,
2259 .is_visible = iscsi_conn_attr_is_visible,
2260};
2261
1da177e4 2262/*
0896b752 2263 * iSCSI session attrs
1da177e4 2264 */
b2c64167 2265#define iscsi_session_attr_show(param, perm) \
fd7255f5 2266static ssize_t \
ee959b00
TJ		 2267show_session_param_##param(struct device *dev, \
2268 struct device_attribute *attr, char *buf) \
fd7255f5 2269{ \
ee959b00
TJ		 2270 struct iscsi_cls_session *session = \
2271 iscsi_dev_to_session(dev->parent); \
fd7255f5 2272 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2273 \
2274 if (perm && !capable(CAP_SYS_ADMIN)) \
2275 return -EACCES; \
a54a52ca 2276 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2277}
2278
b2c64167
MC		 2279#define iscsi_session_attr(field, param, perm) \
2280 iscsi_session_attr_show(param, perm) \
a54a52ca 2281static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5 2282 NULL);
b2c64167
MC		 2283iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2284iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2285iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2286iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2287iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2288iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2289iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2290iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2291iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2292iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2293iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2294iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2295iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2296iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 2297iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2298iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2299iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2300iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2301iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2302iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2303iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2304
6eabafbe 2305static ssize_t
ee959b00
TJ		 2306show_priv_session_state(struct device *dev, struct device_attribute *attr,
2307 char *buf)
6eabafbe 2308{
ee959b00 2309 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2310 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2311}
2312static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2313 NULL);
2314
fd7255f5
MC		 2315#define iscsi_priv_session_attr_show(field, format) \
2316static ssize_t \
ee959b00
TJ		 2317show_priv_session_##field(struct device *dev, \
2318 struct device_attribute *attr, char *buf) \
fd7255f5 2319{ \
ee959b00
TJ		 2320 struct iscsi_cls_session *session = \
2321 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2322 if (session->field == -1) \
2323 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2324 return sprintf(buf, format"\n", session->field); \
2325}
2326
fe4f0bde
VC		 2327#define iscsi_priv_session_attr_store(field) \
2328static ssize_t \
2329store_priv_session_##field(struct device *dev, \
2330 struct device_attribute *attr, \
2331 const char *buf, size_t count) \
2332{ \
2333 int val; \
2334 char *cp; \
2335 struct iscsi_cls_session *session = \
2336 iscsi_dev_to_session(dev->parent); \
2337 if ((session->state == ISCSI_SESSION_FREE) || \
2338 (session->state == ISCSI_SESSION_FAILED)) \
2339 return -EBUSY; \
2340 if (strncmp(buf, "off", 3) == 0) \
2341 session->field = -1; \
2342 else { \
2343 val = simple_strtoul(buf, &cp, 0); \
2344 if (*cp != '\0' && *cp != '\n') \
2345 return -EINVAL; \
2346 session->field = val; \
2347 } \
2348 return count; \
2349}
2350
2351#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2352 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2353 iscsi_priv_session_attr_store(field) \
523f3c80 2354static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2355 show_priv_session_##field, \
2356 store_priv_session_##field)
2357iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2358
1d063c17
MC		 2359static struct attribute *iscsi_session_attrs[] = {
2360 &dev_attr_sess_initial_r2t.attr,
2361 &dev_attr_sess_max_outstanding_r2t.attr,
2362 &dev_attr_sess_immediate_data.attr,
2363 &dev_attr_sess_first_burst_len.attr,
2364 &dev_attr_sess_max_burst_len.attr,
2365 &dev_attr_sess_data_pdu_in_order.attr,
2366 &dev_attr_sess_data_seq_in_order.attr,
2367 &dev_attr_sess_erl.attr,
2368 &dev_attr_sess_targetname.attr,
2369 &dev_attr_sess_tpgt.attr,
2370 &dev_attr_sess_password.attr,
2371 &dev_attr_sess_password_in.attr,
2372 &dev_attr_sess_username.attr,
2373 &dev_attr_sess_username_in.attr,
2374 &dev_attr_sess_fast_abort.attr,
2375 &dev_attr_sess_abort_tmo.attr,
2376 &dev_attr_sess_lu_reset_tmo.attr,
2377 &dev_attr_sess_tgt_reset_tmo.attr,
2378 &dev_attr_sess_ifacename.attr,
2379 &dev_attr_sess_initiatorname.attr,
2380 &dev_attr_sess_targetalias.attr,
2381 &dev_attr_priv_sess_recovery_tmo.attr,
2382 &dev_attr_priv_sess_state.attr,
2383 NULL,
2384};
2385
2386static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2387 struct attribute *attr, int i)
2388{
2389 struct device *cdev = container_of(kobj, struct device, kobj);
2390 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2391 struct iscsi_transport *t = session->transport;
2392 int param;
2393
2394 if (attr == &dev_attr_sess_initial_r2t.attr)
2395 param = ISCSI_PARAM_INITIAL_R2T_EN;
2396 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2397 param = ISCSI_PARAM_MAX_R2T;
2398 else if (attr == &dev_attr_sess_immediate_data.attr)
2399 param = ISCSI_PARAM_IMM_DATA_EN;
2400 else if (attr == &dev_attr_sess_first_burst_len.attr)
2401 param = ISCSI_PARAM_FIRST_BURST;
2402 else if (attr == &dev_attr_sess_max_burst_len.attr)
2403 param = ISCSI_PARAM_MAX_BURST;
2404 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2405 param = ISCSI_PARAM_PDU_INORDER_EN;
2406 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2407 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2408 else if (attr == &dev_attr_sess_erl.attr)
2409 param = ISCSI_PARAM_ERL;
2410 else if (attr == &dev_attr_sess_targetname.attr)
2411 param = ISCSI_PARAM_TARGET_NAME;
2412 else if (attr == &dev_attr_sess_tpgt.attr)
2413 param = ISCSI_PARAM_TPGT;
2414 else if (attr == &dev_attr_sess_password.attr)
2415 param = ISCSI_PARAM_USERNAME;
2416 else if (attr == &dev_attr_sess_password_in.attr)
2417 param = ISCSI_PARAM_USERNAME_IN;
2418 else if (attr == &dev_attr_sess_username.attr)
2419 param = ISCSI_PARAM_PASSWORD;
2420 else if (attr == &dev_attr_sess_username_in.attr)
2421 param = ISCSI_PARAM_PASSWORD_IN;
2422 else if (attr == &dev_attr_sess_fast_abort.attr)
2423 param = ISCSI_PARAM_FAST_ABORT;
2424 else if (attr == &dev_attr_sess_abort_tmo.attr)
2425 param = ISCSI_PARAM_ABORT_TMO;
2426 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2427 param = ISCSI_PARAM_LU_RESET_TMO;
2428 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2429 param = ISCSI_PARAM_TGT_RESET_TMO;
2430 else if (attr == &dev_attr_sess_ifacename.attr)
2431 param = ISCSI_PARAM_IFACE_NAME;
2432 else if (attr == &dev_attr_sess_initiatorname.attr)
2433 param = ISCSI_PARAM_INITIATOR_NAME;
2434 else if (attr == &dev_attr_sess_targetalias.attr)
2435 param = ISCSI_PARAM_TARGET_ALIAS;
2436 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2437 return S_IRUGO | S_IWUSR;
2438 else if (attr == &dev_attr_priv_sess_state.attr)
2439 return S_IRUGO;
2440 else {
2441 WARN_ONCE(1, "Invalid session attr");
2442 return 0;
2443 }
2444
2445 return t->attr_is_visible(ISCSI_PARAM, param);
2446}
2447
2448static struct attribute_group iscsi_session_group = {
2449 .attrs = iscsi_session_attrs,
2450 .is_visible = iscsi_session_attr_is_visible,
2451};
2452
1819dc81
MC		 2453/*
2454 * iSCSI host attrs
2455 */
2456#define iscsi_host_attr_show(param) \
2457static ssize_t \
ee959b00
TJ		 2458show_host_param_##param(struct device *dev, \
2459 struct device_attribute *attr, char *buf) \
1819dc81 2460{ \
ee959b00 2461 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2462 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2463 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2464}
2465
2466#define iscsi_host_attr(field, param) \
2467 iscsi_host_attr_show(param) \
2468static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2469 NULL);
2470
d8196ed2 2471iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2472iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2473iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2474iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 2475
f27fb2ef
MC		 2476static struct attribute *iscsi_host_attrs[] = {
2477 &dev_attr_host_netdev.attr,
2478 &dev_attr_host_hwaddress.attr,
2479 &dev_attr_host_ipaddress.attr,
2480 &dev_attr_host_initiatorname.attr,
2481 NULL,
2482};
2483
2484static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2485 struct attribute *attr, int i)
2486{
2487 struct device *cdev = container_of(kobj, struct device, kobj);
2488 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2489 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2490 int param;
2491
2492 if (attr == &dev_attr_host_netdev.attr)
2493 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2494 else if (attr == &dev_attr_host_hwaddress.attr)
2495 param = ISCSI_HOST_PARAM_HWADDRESS;
2496 else if (attr == &dev_attr_host_ipaddress.attr)
2497 param = ISCSI_HOST_PARAM_IPADDRESS;
2498 else if (attr == &dev_attr_host_initiatorname.attr)
2499 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2500 else {
2501 WARN_ONCE(1, "Invalid host attr");
2502 return 0;
2503 }
2504
2505 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2506}
2507
2508static struct attribute_group iscsi_host_group = {
2509 .attrs = iscsi_host_attrs,
2510 .is_visible = iscsi_host_attr_is_visible,
2511};
1819dc81 2512
0896b752
AA		 2513static int iscsi_session_match(struct attribute_container *cont,
2514 struct device *dev)
1da177e4 2515{
7b8631b5 2516 struct iscsi_cls_session *session;
1da177e4 2517 struct Scsi_Host *shost;
0896b752
AA		 2518 struct iscsi_internal *priv;
2519
2520 if (!iscsi_is_session_dev(dev))
2521 return 0;
1da177e4 2522
7b8631b5
MC		 2523 session = iscsi_dev_to_session(dev);
2524 shost = iscsi_session_to_shost(session);
0896b752 2525 if (!shost->transportt)
1da177e4
LT		 2526 return 0;
2527
0896b752
AA		 2528 priv = to_iscsi_internal(shost->transportt);
2529 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2530 return 0;
2531
0896b752 2532 return &priv->session_cont.ac == cont;
1da177e4
LT		 2533}
2534
0896b752
AA		 2535static int iscsi_conn_match(struct attribute_container *cont,
2536 struct device *dev)
2537{
7b8631b5
MC		 2538 struct iscsi_cls_session *session;
2539 struct iscsi_cls_conn *conn;
1da177e4 2540 struct Scsi_Host *shost;
0896b752 2541 struct iscsi_internal *priv;
1da177e4 2542
0896b752 2543 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2544 return 0;
2545
7b8631b5
MC		 2546 conn = iscsi_dev_to_conn(dev);
2547 session = iscsi_dev_to_session(conn->dev.parent);
2548 shost = iscsi_session_to_shost(session);
2549
0896b752 2550 if (!shost->transportt)
1da177e4
LT		 2551 return 0;
2552
0896b752
AA		 2553 priv = to_iscsi_internal(shost->transportt);
2554 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2555 return 0;
1da177e4 2556
0896b752
AA		 2557 return &priv->conn_cont.ac == cont;
2558}
2559
30a6c652
MC		 2560static int iscsi_host_match(struct attribute_container *cont,
2561 struct device *dev)
2562{
2563 struct Scsi_Host *shost;
2564 struct iscsi_internal *priv;
2565
2566 if (!scsi_is_host_device(dev))
2567 return 0;
2568
2569 shost = dev_to_shost(dev);
2570 if (!shost->transportt ||
2571 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2572 return 0;
2573
2574 priv = to_iscsi_internal(shost->transportt);
2575 return &priv->t.host_attrs.ac == cont;
2576}
2577
7b8631b5
MC		 2578struct scsi_transport_template *
2579iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2580{
2581 struct iscsi_internal *priv;
2582 unsigned long flags;
f27fb2ef 2583 int err;
0896b752
AA		 2584
2585 BUG_ON(!tt);
2586
2587 priv = iscsi_if_transport_lookup(tt);
2588 if (priv)
7b8631b5 2589 return NULL;
0896b752 2590
24669f75 2591 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2592 if (!priv)
7b8631b5 2593 return NULL;
0896b752 2594 INIT_LIST_HEAD(&priv->list);
0896b752 2595 priv->iscsi_transport = tt;
30a6c652 2596 priv->t.user_scan = iscsi_user_scan;
06d25af4 2597 priv->t.create_work_queue = 1;
0896b752 2598
ee959b00 2599 priv->dev.class = &iscsi_transport_class;
71610f55 2600 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2601 err = device_register(&priv->dev);
0896b752
AA		 2602 if (err)
2603 goto free_priv;
2604
ee959b00 2605 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2606 if (err)
ee959b00 2607 goto unregister_dev;
0896b752 2608
30a6c652 2609 /* host parameters */
30a6c652
MC		 2610 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2611 priv->t.host_attrs.ac.match = iscsi_host_match;
f27fb2ef 2612 priv->t.host_attrs.ac.grp = &iscsi_host_group;
32c6e1b9 2613 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2614 transport_container_register(&priv->t.host_attrs);
2615
0896b752 2616 /* connection parameters */
0896b752
AA		 2617 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2618 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2619 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2620 transport_container_register(&priv->conn_cont);
1da177e4 2621
0896b752 2622 /* session parameters */
0896b752
AA		 2623 priv->session_cont.ac.class = &iscsi_session_class.class;
2624 priv->session_cont.ac.match = iscsi_session_match;
1d063c17 2625 priv->session_cont.ac.grp = &iscsi_session_group;
0896b752
AA		 2626 transport_container_register(&priv->session_cont);
2627
0896b752
AA		 2628 spin_lock_irqsave(&iscsi_transport_lock, flags);
2629 list_add(&priv->list, &iscsi_transports);
2630 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2631
2632 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2633 return &priv->t;
1da177e4 2634
ee959b00
TJ		 2635unregister_dev:
2636 device_unregister(&priv->dev);
d82ff9be 2637 return NULL;
0896b752
AA		 2638free_priv:
2639 kfree(priv);
7b8631b5 2640 return NULL;
1da177e4 2641}
0896b752
AA		 2642EXPORT_SYMBOL_GPL(iscsi_register_transport);
2643
2644int iscsi_unregister_transport(struct iscsi_transport *tt)
2645{
2646 struct iscsi_internal *priv;
2647 unsigned long flags;
2648
2649 BUG_ON(!tt);
2650
0b950672 2651 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2652
2653 priv = iscsi_if_transport_lookup(tt);
2654 BUG_ON (!priv);
2655
0896b752
AA		 2656 spin_lock_irqsave(&iscsi_transport_lock, flags);
2657 list_del(&priv->list);
2658 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2659
2660 transport_container_unregister(&priv->conn_cont);
2661 transport_container_unregister(&priv->session_cont);
30a6c652 2662 transport_container_unregister(&priv->t.host_attrs);
0896b752 2663
ee959b00
TJ		 2664 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2665 device_unregister(&priv->dev);
0b950672 2666 mutex_unlock(&rx_queue_mutex);
1da177e4 2667
0896b752
AA		 2668 return 0;
2669}
2670EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2671
1da177e4
LT		 2672static __init int iscsi_transport_init(void)
2673{
0896b752 2674 int err;
1da177e4 2675
09492605 2676 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2677 ISCSI_TRANSPORT_VERSION);
2678
41be1444
MC		 2679 atomic_set(&iscsi_session_nr, 0);
2680
0896b752 2681 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2682 if (err)
2683 return err;
0896b752 2684
d82ff9be 2685 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2686 if (err)
2687 goto unregister_transport_class;
2688
8d07913d 2689 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2690 if (err)
2691 goto unregister_endpoint_class;
2692
8d07913d
MC		 2693 err = transport_class_register(&iscsi_host_class);
2694 if (err)
2695 goto unregister_iface_class;
2696
30a6c652
MC		 2697 err = transport_class_register(&iscsi_connection_class);
2698 if (err)
2699 goto unregister_host_class;
2700
0896b752
AA		 2701 err = transport_class_register(&iscsi_session_class);
2702 if (err)
2703 goto unregister_conn_class;
2704
d82ff9be
MC		 2705 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2706 NULL, THIS_MODULE);
0896b752
AA		 2707 if (!nls) {
2708 err = -ENOBUFS;
43a145a3 2709 goto unregister_session_class;
0896b752
AA		 2710 }
2711
d8bf541e
MC		 2712 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2713 if (!iscsi_eh_timer_workq)
2714 goto release_nls;
2715
43a145a3 2716 return 0;
0896b752 2717
d8bf541e 2718release_nls:
b7c6ba6e 2719 netlink_kernel_release(nls);
0896b752
AA		 2720unregister_session_class:
2721 transport_class_unregister(&iscsi_session_class);
2722unregister_conn_class:
2723 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2724unregister_host_class:
2725 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2726unregister_iface_class:
2727 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2728unregister_endpoint_class:
2729 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2730unregister_transport_class:
2731 class_unregister(&iscsi_transport_class);
2732 return err;
1da177e4
LT		 2733}
2734
2735static void __exit iscsi_transport_exit(void)
2736{
d8bf541e 2737 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2738 netlink_kernel_release(nls);
0896b752
AA		 2739 transport_class_unregister(&iscsi_connection_class);
2740 transport_class_unregister(&iscsi_session_class);
30a6c652 2741 transport_class_unregister(&iscsi_host_class);
d82ff9be 2742 class_unregister(&iscsi_endpoint_class);
8d07913d 2743 class_unregister(&iscsi_iface_class);
0896b752 2744 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2745}
2746
2747module_init(iscsi_transport_init);
2748module_exit(iscsi_transport_exit);
2749
0896b752
AA		 2750MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2751 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2752 "Alex Aizman <itn780@yahoo.com>");
2753MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2754MODULE_LICENSE("GPL");
f4246b33 2755MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 2756MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
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