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[SCSI] pm8001: fix endian issue with code optimization.
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / scsi_transport_iscsi.c
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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>
8d4a690c 27#include <linux/idr.h>
0896b752 28#include <net/tcp.h>
1da177e4
LT		 29#include <scsi/scsi.h>
30#include <scsi/scsi_host.h>
31#include <scsi/scsi_device.h>
32#include <scsi/scsi_transport.h>
33#include <scsi/scsi_transport_iscsi.h>
0896b752 34#include <scsi/iscsi_if.h>
c01be6dc 35#include <scsi/scsi_cmnd.h>
90eeb01a 36#include <scsi/scsi_bsg_iscsi.h>
1da177e4 37
4c2133c8 38#define ISCSI_TRANSPORT_VERSION "2.0-870"
1da177e4 39
632248aa
MC		 40static int dbg_session;
41module_param_named(debug_session, dbg_session, int,
42 S_IRUGO | S_IWUSR);
43MODULE_PARM_DESC(debug_session,
44 "Turn on debugging for sessions in scsi_transport_iscsi "
45 "module. Set to 1 to turn on, and zero to turn off. Default "
46 "is off.");
47
48static int dbg_conn;
49module_param_named(debug_conn, dbg_conn, int,
50 S_IRUGO | S_IWUSR);
51MODULE_PARM_DESC(debug_conn,
52 "Turn on debugging for connections in scsi_transport_iscsi "
53 "module. Set to 1 to turn on, and zero to turn off. Default "
54 "is off.");
55
56#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
57 do { \
58 if (dbg_session) \
59 iscsi_cls_session_printk(KERN_INFO, _session, \
60 "%s: " dbg_fmt, \
61 __func__, ##arg); \
62 } while (0);
63
64#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
65 do { \
66 if (dbg_conn) \
67 iscsi_cls_conn_printk(KERN_INFO, _conn, \
68 "%s: " dbg_fmt, \
69 __func__, ##arg); \
70 } while (0);
71
1da177e4
LT		 72struct iscsi_internal {
73 struct scsi_transport_template t;
0896b752
AA		 74 struct iscsi_transport *iscsi_transport;
75 struct list_head list;
ee959b00 76 struct device dev;
30a6c652 77
0896b752 78 struct transport_container conn_cont;
0896b752 79 struct transport_container session_cont;
1da177e4
LT		 80};
81
41be1444 82static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
d8bf541e 83static struct workqueue_struct *iscsi_eh_timer_workq;
b5c7a12d 84
8d4a690c 85static DEFINE_IDA(iscsi_sess_ida);
0896b752
AA		 86/*
87 * list of registered transports and lock that must
88 * be held while accessing list. The iscsi_transport_lock must
0b950672 89 * be acquired after the rx_queue_mutex.
0896b752
AA		 90 */
91static LIST_HEAD(iscsi_transports);
92static DEFINE_SPINLOCK(iscsi_transport_lock);
93
94#define to_iscsi_internal(tmpl) \
95 container_of(tmpl, struct iscsi_internal, t)
96
ee959b00
TJ		 97#define dev_to_iscsi_internal(_dev) \
98 container_of(_dev, struct iscsi_internal, dev)
0896b752 99
ee959b00 100static void iscsi_transport_release(struct device *dev)
0896b752 101{
ee959b00 102 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
0896b752
AA		 103 kfree(priv);
104}
1da177e4 105
0896b752
AA		 106/*
107 * iscsi_transport_class represents the iscsi_transports that are
108 * registered.
109 */
110static struct class iscsi_transport_class = {
111 .name = "iscsi_transport",
ee959b00 112 .dev_release = iscsi_transport_release,
0896b752
AA		 113};
114
115static ssize_t
ee959b00
TJ		 116show_transport_handle(struct device *dev, struct device_attribute *attr,
117 char *buf)
0896b752 118{
ee959b00 119 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
762e2bfa 120 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752 121}
ee959b00 122static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
0896b752
AA		 123
124#define show_transport_attr(name, format) \
125static ssize_t \
ee959b00
TJ		 126show_transport_##name(struct device *dev, \
127 struct device_attribute *attr,char *buf) \
0896b752 128{ \
ee959b00 129 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
0896b752
AA		 130 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
131} \
ee959b00 132static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
0896b752
AA		 133
134show_transport_attr(caps, "0x%x");
0896b752
AA		 135
136static struct attribute *iscsi_transport_attrs[] = {
ee959b00
TJ		 137 &dev_attr_handle.attr,
138 &dev_attr_caps.attr,
0896b752
AA		 139 NULL,
140};
141
142static struct attribute_group iscsi_transport_group = {
143 .attrs = iscsi_transport_attrs,
144};
145
d82ff9be
MC		 146/*
147 * iSCSI endpoint attrs
148 */
149#define iscsi_dev_to_endpoint(_dev) \
150 container_of(_dev, struct iscsi_endpoint, dev)
151
152#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
153struct device_attribute dev_attr_##_prefix##_##_name = \
154 __ATTR(_name,_mode,_show,_store)
155
156static void iscsi_endpoint_release(struct device *dev)
157{
158 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
159 kfree(ep);
160}
161
162static struct class iscsi_endpoint_class = {
163 .name = "iscsi_endpoint",
164 .dev_release = iscsi_endpoint_release,
165};
166
167static ssize_t
168show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
169{
170 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 171 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
d82ff9be
MC		 172}
173static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
174
175static struct attribute *iscsi_endpoint_attrs[] = {
176 &dev_attr_ep_handle.attr,
177 NULL,
178};
179
180static struct attribute_group iscsi_endpoint_group = {
181 .attrs = iscsi_endpoint_attrs,
182};
183
184#define ISCSI_MAX_EPID -1
185
186static int iscsi_match_epid(struct device *dev, void *data)
187{
188 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 189 uint64_t *epid = (uint64_t *) data;
d82ff9be
MC		 190
191 return *epid == ep->id;
192}
193
194struct iscsi_endpoint *
195iscsi_create_endpoint(int dd_size)
196{
197 struct device *dev;
198 struct iscsi_endpoint *ep;
21536062 199 uint64_t id;
d82ff9be
MC		 200 int err;
201
202 for (id = 1; id < ISCSI_MAX_EPID; id++) {
695794ae 203 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
d82ff9be
MC		 204 iscsi_match_epid);
205 if (!dev)
206 break;
207 }
208 if (id == ISCSI_MAX_EPID) {
209 printk(KERN_ERR "Too many connections. Max supported %u\n",
210 ISCSI_MAX_EPID - 1);
211 return NULL;
212 }
213
214 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
215 if (!ep)
216 return NULL;
217
218 ep->id = id;
219 ep->dev.class = &iscsi_endpoint_class;
71610f55 220 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
d82ff9be
MC		 221 err = device_register(&ep->dev);
222 if (err)
223 goto free_ep;
224
225 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
226 if (err)
227 goto unregister_dev;
228
229 if (dd_size)
230 ep->dd_data = &ep[1];
231 return ep;
232
233unregister_dev:
234 device_unregister(&ep->dev);
235 return NULL;
236
237free_ep:
238 kfree(ep);
239 return NULL;
240}
241EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
242
243void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
244{
245 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
246 device_unregister(&ep->dev);
247}
248EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
249
250struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
251{
f80f868e 252 struct iscsi_endpoint *ep;
d82ff9be
MC		 253 struct device *dev;
254
695794ae 255 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
d82ff9be
MC		 256 iscsi_match_epid);
257 if (!dev)
258 return NULL;
259
f80f868e
MC		 260 ep = iscsi_dev_to_endpoint(dev);
261 /*
262 * we can drop this now because the interface will prevent
263 * removals and lookups from racing.
264 */
265 put_device(dev);
266 return ep;
d82ff9be
MC		 267}
268EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
269
8d07913d
MC		 270/*
271 * Interface to display network param to sysfs
272 */
273
274static void iscsi_iface_release(struct device *dev)
275{
276 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
277 struct device *parent = iface->dev.parent;
278
279 kfree(iface);
280 put_device(parent);
281}
282
283
284static struct class iscsi_iface_class = {
285 .name = "iscsi_iface",
286 .dev_release = iscsi_iface_release,
287};
288
289#define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
290struct device_attribute dev_attr_##_prefix##_##_name = \
291 __ATTR(_name, _mode, _show, _store)
292
293/* iface attrs show */
294#define iscsi_iface_attr_show(type, name, param_type, param) \
295static ssize_t \
296show_##type##_##name(struct device *dev, struct device_attribute *attr, \
297 char *buf) \
298{ \
299 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
300 struct iscsi_transport *t = iface->transport; \
301 return t->get_iface_param(iface, param_type, param, buf); \
302} \
303
304#define iscsi_iface_net_attr(type, name, param) \
305 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
306static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
307
308/* generic read only ipvi4 attribute */
309iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
310iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
311iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
312iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
313
314/* generic read only ipv6 attribute */
315iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
316iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
317iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
318iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
319 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
88f4f517 320iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
8d07913d
MC		 321 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
322
323/* common read only iface attribute */
324iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
2d63673b 325iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
4223b9e9
MC		 326iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
327iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
8c7d40fb 328iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
fcb5124e 329iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
8d07913d 330
587a1f16 331static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
8d07913d
MC		 332 struct attribute *attr, int i)
333{
334 struct device *dev = container_of(kobj, struct device, kobj);
335 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
336 struct iscsi_transport *t = iface->transport;
b78dbba0 337 int param;
8d07913d
MC		 338
339 if (attr == &dev_attr_iface_enabled.attr)
b78dbba0 340 param = ISCSI_NET_PARAM_IFACE_ENABLE;
2d63673b 341 else if (attr == &dev_attr_iface_vlan_id.attr)
b78dbba0 342 param = ISCSI_NET_PARAM_VLAN_ID;
4223b9e9
MC		 343 else if (attr == &dev_attr_iface_vlan_priority.attr)
344 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
345 else if (attr == &dev_attr_iface_vlan_enabled.attr)
346 param = ISCSI_NET_PARAM_VLAN_ENABLED;
8c7d40fb
VC		 347 else if (attr == &dev_attr_iface_mtu.attr)
348 param = ISCSI_NET_PARAM_MTU;
fcb5124e
VC		 349 else if (attr == &dev_attr_iface_port.attr)
350 param = ISCSI_NET_PARAM_PORT;
b78dbba0 351 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
8d07913d 352 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
b78dbba0 353 param = ISCSI_NET_PARAM_IPV4_ADDR;
8d07913d 354 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
b78dbba0 355 param = ISCSI_NET_PARAM_IPV4_GW;
8d07913d 356 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
b78dbba0 357 param = ISCSI_NET_PARAM_IPV4_SUBNET;
8d07913d 358 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
b78dbba0
MC		 359 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
360 else
361 return 0;
8d07913d
MC		 362 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
363 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
b78dbba0 364 param = ISCSI_NET_PARAM_IPV6_ADDR;
8d07913d 365 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
b78dbba0 366 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
8d07913d 367 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
b78dbba0 368 param = ISCSI_NET_PARAM_IPV6_ROUTER;
8d07913d 369 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
b78dbba0 370 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
88f4f517 371 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
b78dbba0
MC		 372 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
373 else
374 return 0;
375 } else {
376 WARN_ONCE(1, "Invalid iface attr");
377 return 0;
8d07913d
MC		 378 }
379
b78dbba0 380 return t->attr_is_visible(ISCSI_NET_PARAM, param);
8d07913d
MC		 381}
382
383static struct attribute *iscsi_iface_attrs[] = {
384 &dev_attr_iface_enabled.attr,
2d63673b 385 &dev_attr_iface_vlan_id.attr,
4223b9e9
MC		 386 &dev_attr_iface_vlan_priority.attr,
387 &dev_attr_iface_vlan_enabled.attr,
8d07913d
MC		 388 &dev_attr_ipv4_iface_ipaddress.attr,
389 &dev_attr_ipv4_iface_gateway.attr,
390 &dev_attr_ipv4_iface_subnet.attr,
391 &dev_attr_ipv4_iface_bootproto.attr,
392 &dev_attr_ipv6_iface_ipaddress.attr,
393 &dev_attr_ipv6_iface_link_local_addr.attr,
394 &dev_attr_ipv6_iface_router_addr.attr,
395 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
88f4f517 396 &dev_attr_ipv6_iface_link_local_autocfg.attr,
8c7d40fb 397 &dev_attr_iface_mtu.attr,
fcb5124e 398 &dev_attr_iface_port.attr,
8d07913d
MC		 399 NULL,
400};
401
402static struct attribute_group iscsi_iface_group = {
403 .attrs = iscsi_iface_attrs,
404 .is_visible = iscsi_iface_attr_is_visible,
405};
406
407struct iscsi_iface *
408iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
409 uint32_t iface_type, uint32_t iface_num, int dd_size)
410{
411 struct iscsi_iface *iface;
412 int err;
413
414 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
415 if (!iface)
416 return NULL;
417
418 iface->transport = transport;
419 iface->iface_type = iface_type;
420 iface->iface_num = iface_num;
421 iface->dev.release = iscsi_iface_release;
422 iface->dev.class = &iscsi_iface_class;
423 /* parent reference released in iscsi_iface_release */
424 iface->dev.parent = get_device(&shost->shost_gendev);
425 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
426 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
427 iface_num);
428 else
429 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
430 iface_num);
431
432 err = device_register(&iface->dev);
433 if (err)
434 goto free_iface;
435
436 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
437 if (err)
438 goto unreg_iface;
439
440 if (dd_size)
441 iface->dd_data = &iface[1];
442 return iface;
443
444unreg_iface:
445 device_unregister(&iface->dev);
446 return NULL;
447
448free_iface:
449 put_device(iface->dev.parent);
450 kfree(iface);
451 return NULL;
452}
453EXPORT_SYMBOL_GPL(iscsi_create_iface);
454
455void iscsi_destroy_iface(struct iscsi_iface *iface)
456{
457 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
458 device_unregister(&iface->dev);
459}
460EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
461
90eeb01a
MC		 462/*
463 * BSG support
464 */
465/**
466 * iscsi_bsg_host_dispatch - Dispatch command to LLD.
467 * @job: bsg job to be processed
468 */
469static int iscsi_bsg_host_dispatch(struct bsg_job *job)
470{
471 struct Scsi_Host *shost = iscsi_job_to_shost(job);
472 struct iscsi_bsg_request *req = job->request;
473 struct iscsi_bsg_reply *reply = job->reply;
474 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
475 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
476 int ret;
477
478 /* check if we have the msgcode value at least */
479 if (job->request_len < sizeof(uint32_t)) {
480 ret = -ENOMSG;
481 goto fail_host_msg;
482 }
483
484 /* Validate the host command */
485 switch (req->msgcode) {
486 case ISCSI_BSG_HST_VENDOR:
487 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
488 if ((shost->hostt->vendor_id == 0L) ||
489 (req->rqst_data.h_vendor.vendor_id !=
490 shost->hostt->vendor_id)) {
491 ret = -ESRCH;
492 goto fail_host_msg;
493 }
494 break;
495 default:
496 ret = -EBADR;
497 goto fail_host_msg;
498 }
499
500 /* check if we really have all the request data needed */
501 if (job->request_len < cmdlen) {
502 ret = -ENOMSG;
503 goto fail_host_msg;
504 }
505
506 ret = i->iscsi_transport->bsg_request(job);
507 if (!ret)
508 return 0;
509
510fail_host_msg:
511 /* return the errno failure code as the only status */
512 BUG_ON(job->reply_len < sizeof(uint32_t));
513 reply->reply_payload_rcv_len = 0;
514 reply->result = ret;
515 job->reply_len = sizeof(uint32_t);
516 bsg_job_done(job, ret, 0);
517 return 0;
518}
519
520/**
521 * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
522 * @shost: shost for iscsi_host
eae627e4 523 * @ihost: iscsi_cls_host adding the structures to
90eeb01a
MC		 524 */
525static int
526iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
527{
528 struct device *dev = &shost->shost_gendev;
529 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
530 struct request_queue *q;
531 char bsg_name[20];
532 int ret;
533
534 if (!i->iscsi_transport->bsg_request)
535 return -ENOTSUPP;
536
537 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
538
539 q = __scsi_alloc_queue(shost, bsg_request_fn);
540 if (!q)
541 return -ENOMEM;
542
543 ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
544 if (ret) {
545 shost_printk(KERN_ERR, shost, "bsg interface failed to "
546 "initialize - no request queue\n");
547 blk_cleanup_queue(q);
548 return ret;
549 }
550
551 ihost->bsg_q = q;
552 return 0;
553}
554
30a6c652 555static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 556 struct device *cdev)
30a6c652
MC		 557{
558 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 559 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 560
561 memset(ihost, 0, sizeof(*ihost));
8aae18ad 562 atomic_set(&ihost->nr_scans, 0);
7970634b 563 mutex_init(&ihost->mutex);
90eeb01a
MC		 564
565 iscsi_bsg_host_add(shost, ihost);
566 /* ignore any bsg add error - we just can't do sgio */
567
568 return 0;
569}
570
571static int iscsi_remove_host(struct transport_container *tc,
572 struct device *dev, struct device *cdev)
573{
574 struct Scsi_Host *shost = dev_to_shost(dev);
575 struct iscsi_cls_host *ihost = shost->shost_data;
576
577 if (ihost->bsg_q) {
578 bsg_remove_queue(ihost->bsg_q);
579 blk_cleanup_queue(ihost->bsg_q);
580 }
30a6c652
MC		 581 return 0;
582}
583
584static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
585 "iscsi_host",
586 iscsi_setup_host,
90eeb01a 587 iscsi_remove_host,
30a6c652
MC		 588 NULL);
589
0896b752
AA		 590static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
591 "iscsi_session",
1da177e4
LT		 592 NULL,
593 NULL,
594 NULL);
595
0896b752
AA		 596static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
597 "iscsi_connection",
1da177e4
LT		 598 NULL,
599 NULL,
600 NULL);
0896b752
AA		 601
602static struct sock *nls;
0b950672 603static DEFINE_MUTEX(rx_queue_mutex);
0896b752 604
7b7232f3
MC		 605static LIST_HEAD(sesslist);
606static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 607static LIST_HEAD(connlist);
608static DEFINE_SPINLOCK(connlock);
0896b752 609
b5c7a12d
MC		 610static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
611{
612 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
613 return sess->sid;
614}
615
616/*
617 * Returns the matching session to a given sid
618 */
619static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 620{
621 unsigned long flags;
622 struct iscsi_cls_session *sess;
623
624 spin_lock_irqsave(&sesslock, flags);
625 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 626 if (sess->sid == sid) {
7b7232f3
MC		 627 spin_unlock_irqrestore(&sesslock, flags);
628 return sess;
629 }
630 }
631 spin_unlock_irqrestore(&sesslock, flags);
632 return NULL;
633}
634
b5c7a12d
MC		 635/*
636 * Returns the matching connection to a given sid / cid tuple
637 */
638static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 639{
640 unsigned long flags;
641 struct iscsi_cls_conn *conn;
642
643 spin_lock_irqsave(&connlock, flags);
644 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 645 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 646 spin_unlock_irqrestore(&connlock, flags);
647 return conn;
648 }
649 }
650 spin_unlock_irqrestore(&connlock, flags);
651 return NULL;
652}
653
7b8631b5
MC		 654/*
655 * The following functions can be used by LLDs that allocate
656 * their own scsi_hosts or by software iscsi LLDs
657 */
6eabafbe
MC		 658static struct {
659 int value;
660 char *name;
661} iscsi_session_state_names[] = {
662 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
663 { ISCSI_SESSION_FAILED, "FAILED" },
664 { ISCSI_SESSION_FREE, "FREE" },
665};
666
3b0f208a 667static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 668{
669 int i;
670 char *name = NULL;
671
672 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
673 if (iscsi_session_state_names[i].value == state) {
674 name = iscsi_session_state_names[i].name;
675 break;
676 }
677 }
678 return name;
679}
680
681int iscsi_session_chkready(struct iscsi_cls_session *session)
682{
683 unsigned long flags;
684 int err;
685
686 spin_lock_irqsave(&session->lock, flags);
687 switch (session->state) {
688 case ISCSI_SESSION_LOGGED_IN:
689 err = 0;
690 break;
691 case ISCSI_SESSION_FAILED:
9a1a69a1 692 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 693 break;
694 case ISCSI_SESSION_FREE:
56d7fcfa 695 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 696 break;
697 default:
698 err = DID_NO_CONNECT << 16;
699 break;
700 }
701 spin_unlock_irqrestore(&session->lock, flags);
702 return err;
703}
704EXPORT_SYMBOL_GPL(iscsi_session_chkready);
705
17fa575e
MR		 706int iscsi_is_session_online(struct iscsi_cls_session *session)
707{
708 unsigned long flags;
709 int ret = 0;
710
711 spin_lock_irqsave(&session->lock, flags);
712 if (session->state == ISCSI_SESSION_LOGGED_IN)
713 ret = 1;
714 spin_unlock_irqrestore(&session->lock, flags);
715 return ret;
716}
717EXPORT_SYMBOL_GPL(iscsi_is_session_online);
718
7b8631b5
MC		 719static void iscsi_session_release(struct device *dev)
720{
721 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 722 struct Scsi_Host *shost;
0896b752 723
7b8631b5
MC		 724 shost = iscsi_session_to_shost(session);
725 scsi_host_put(shost);
632248aa 726 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
7b8631b5 727 kfree(session);
7b8631b5 728}
0896b752 729
7b8631b5
MC		 730static int iscsi_is_session_dev(const struct device *dev)
731{
732 return dev->release == iscsi_session_release;
733}
0896b752 734
a4804cd6
MC		 735static int iscsi_iter_session_fn(struct device *dev, void *data)
736{
737 void (* fn) (struct iscsi_cls_session *) = data;
738
739 if (!iscsi_is_session_dev(dev))
740 return 0;
741 fn(iscsi_dev_to_session(dev));
742 return 0;
743}
744
745void iscsi_host_for_each_session(struct Scsi_Host *shost,
746 void (*fn)(struct iscsi_cls_session *))
747{
748 device_for_each_child(&shost->shost_gendev, fn,
749 iscsi_iter_session_fn);
750}
751EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
752
8aae18ad
MC		 753/**
754 * iscsi_scan_finished - helper to report when running scans are done
755 * @shost: scsi host
756 * @time: scan run time
757 *
758 * This function can be used by drives like qla4xxx to report to the scsi
759 * layer when the scans it kicked off at module load time are done.
760 */
761int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
762{
32c6e1b9 763 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 764 /*
765 * qla4xxx will have kicked off some session unblocks before calling
766 * scsi_scan_host, so just wait for them to complete.
767 */
768 return !atomic_read(&ihost->nr_scans);
769}
770EXPORT_SYMBOL_GPL(iscsi_scan_finished);
771
7970634b
MC		 772struct iscsi_scan_data {
773 unsigned int channel;
774 unsigned int id;
775 unsigned int lun;
776};
777
778static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 779{
7970634b 780 struct iscsi_scan_data *scan_data = data;
30a6c652 781 struct iscsi_cls_session *session;
7970634b
MC		 782 struct Scsi_Host *shost;
783 struct iscsi_cls_host *ihost;
784 unsigned long flags;
785 unsigned int id;
786
787 if (!iscsi_is_session_dev(dev))
788 return 0;
789
790 session = iscsi_dev_to_session(dev);
632248aa
MC		 791
792 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
793
7970634b
MC		 794 shost = iscsi_session_to_shost(session);
795 ihost = shost->shost_data;
30a6c652
MC		 796
797 mutex_lock(&ihost->mutex);
7970634b
MC		 798 spin_lock_irqsave(&session->lock, flags);
799 if (session->state != ISCSI_SESSION_LOGGED_IN) {
800 spin_unlock_irqrestore(&session->lock, flags);
632248aa 801 goto user_scan_exit;
30a6c652 802 }
7970634b
MC		 803 id = session->target_id;
804 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 805
7970634b
MC		 806 if (id != ISCSI_MAX_TARGET) {
807 if ((scan_data->channel == SCAN_WILD_CARD ||
808 scan_data->channel == 0) &&
809 (scan_data->id == SCAN_WILD_CARD ||
810 scan_data->id == id))
811 scsi_scan_target(&session->dev, 0, id,
812 scan_data->lun, 1);
813 }
632248aa
MC		 814
815user_scan_exit:
7970634b 816 mutex_unlock(&ihost->mutex);
632248aa 817 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 818 return 0;
819}
820
7970634b
MC		 821static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
822 uint id, uint lun)
823{
824 struct iscsi_scan_data scan_data;
825
826 scan_data.channel = channel;
827 scan_data.id = id;
828 scan_data.lun = lun;
829
830 return device_for_each_child(&shost->shost_gendev, &scan_data,
831 iscsi_user_scan_session);
832}
833
bd976f62
MC		 834static void iscsi_scan_session(struct work_struct *work)
835{
836 struct iscsi_cls_session *session =
837 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 838 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 839 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 840 struct iscsi_scan_data scan_data;
bd976f62 841
7970634b
MC		 842 scan_data.channel = 0;
843 scan_data.id = SCAN_WILD_CARD;
844 scan_data.lun = SCAN_WILD_CARD;
bd976f62 845
7970634b 846 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 847 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 848}
849
c01be6dc
MC		 850/**
851 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 852 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 853 *
854 * If the session is down this function will wait for the recovery
855 * timer to fire or for the session to be logged back in. If the
856 * recovery timer fires then FAST_IO_FAIL is returned. The caller
857 * should pass this error value to the scsi eh.
858 */
859int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
860{
861 struct iscsi_cls_session *session =
862 starget_to_session(scsi_target(cmd->device));
863 unsigned long flags;
864 int ret = 0;
865
866 spin_lock_irqsave(&session->lock, flags);
867 while (session->state != ISCSI_SESSION_LOGGED_IN) {
868 if (session->state == ISCSI_SESSION_FREE) {
869 ret = FAST_IO_FAIL;
870 break;
871 }
872 spin_unlock_irqrestore(&session->lock, flags);
873 msleep(1000);
874 spin_lock_irqsave(&session->lock, flags);
875 }
876 spin_unlock_irqrestore(&session->lock, flags);
877 return ret;
878}
879EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
880
c4028958 881static void session_recovery_timedout(struct work_struct *work)
30a6c652 882{
c4028958
DH		 883 struct iscsi_cls_session *session =
884 container_of(work, struct iscsi_cls_session,
885 recovery_work.work);
6eabafbe 886 unsigned long flags;
30a6c652 887
322d739d
MC		 888 iscsi_cls_session_printk(KERN_INFO, session,
889 "session recovery timed out after %d secs\n",
890 session->recovery_tmo);
30a6c652 891
6eabafbe
MC		 892 spin_lock_irqsave(&session->lock, flags);
893 switch (session->state) {
894 case ISCSI_SESSION_FAILED:
895 session->state = ISCSI_SESSION_FREE;
896 break;
897 case ISCSI_SESSION_LOGGED_IN:
898 case ISCSI_SESSION_FREE:
899 /* we raced with the unblock's flush */
900 spin_unlock_irqrestore(&session->lock, flags);
901 return;
902 }
903 spin_unlock_irqrestore(&session->lock, flags);
904
30a6c652
MC		 905 if (session->transport->session_recovery_timedout)
906 session->transport->session_recovery_timedout(session);
907
632248aa 908 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
30a6c652 909 scsi_target_unblock(&session->dev);
632248aa 910 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 911}
912
45ab33b6 913static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 914{
45ab33b6
MC		 915 struct iscsi_cls_session *session =
916 container_of(work, struct iscsi_cls_session,
917 unblock_work);
bd976f62 918 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 919 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 920 unsigned long flags;
921
632248aa 922 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 923 /*
924 * The recovery and unblock work get run from the same workqueue,
925 * so try to cancel it if it was going to run after this unblock.
926 */
927 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 928 spin_lock_irqsave(&session->lock, flags);
929 session->state = ISCSI_SESSION_LOGGED_IN;
930 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 931 /* start IO */
932 scsi_target_unblock(&session->dev);
8aae18ad
MC		 933 /*
934 * Only do kernel scanning if the driver is properly hooked into
935 * the async scanning code (drivers like iscsi_tcp do login and
936 * scanning from userspace).
937 */
938 if (shost->hostt->scan_finished) {
06d25af4 939 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 940 atomic_inc(&ihost->nr_scans);
941 }
632248aa 942 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 943}
45ab33b6
MC		 944
945/**
946 * iscsi_unblock_session - set a session as logged in and start IO.
947 * @session: iscsi session
948 *
949 * Mark a session as ready to accept IO.
950 */
951void iscsi_unblock_session(struct iscsi_cls_session *session)
952{
953 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
954 /*
955 * make sure all the events have completed before tell the driver
956 * it is safe
957 */
958 flush_workqueue(iscsi_eh_timer_workq);
959}
30a6c652
MC		 960EXPORT_SYMBOL_GPL(iscsi_unblock_session);
961
45ab33b6 962static void __iscsi_block_session(struct work_struct *work)
30a6c652 963{
45ab33b6
MC		 964 struct iscsi_cls_session *session =
965 container_of(work, struct iscsi_cls_session,
966 block_work);
6eabafbe
MC		 967 unsigned long flags;
968
632248aa 969 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 970 spin_lock_irqsave(&session->lock, flags);
971 session->state = ISCSI_SESSION_FAILED;
972 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 973 scsi_target_block(&session->dev);
632248aa 974 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 975 if (session->recovery_tmo >= 0)
976 queue_delayed_work(iscsi_eh_timer_workq,
977 &session->recovery_work,
978 session->recovery_tmo * HZ);
30a6c652 979}
45ab33b6
MC		 980
981void iscsi_block_session(struct iscsi_cls_session *session)
982{
983 queue_work(iscsi_eh_timer_workq, &session->block_work);
984}
30a6c652
MC		 985EXPORT_SYMBOL_GPL(iscsi_block_session);
986
26974789
MC		 987static void __iscsi_unbind_session(struct work_struct *work)
988{
989 struct iscsi_cls_session *session =
990 container_of(work, struct iscsi_cls_session,
991 unbind_work);
992 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 993 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 994 unsigned long flags;
8d4a690c 995 unsigned int target_id;
26974789 996
632248aa
MC		 997 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
998
26974789
MC		 999 /* Prevent new scans and make sure scanning is not in progress */
1000 mutex_lock(&ihost->mutex);
7970634b
MC		 1001 spin_lock_irqsave(&session->lock, flags);
1002 if (session->target_id == ISCSI_MAX_TARGET) {
1003 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 1004 mutex_unlock(&ihost->mutex);
1005 return;
1006 }
8d4a690c
MC		 1007
1008 target_id = session->target_id;
7970634b
MC		 1009 session->target_id = ISCSI_MAX_TARGET;
1010 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 1011 mutex_unlock(&ihost->mutex);
1012
8d4a690c
MC		 1013 if (session->ida_used)
1014 ida_simple_remove(&iscsi_sess_ida, target_id);
1015
26974789
MC		 1016 scsi_remove_target(&session->dev);
1017 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 1018 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 1019}
1020
7b8631b5 1021struct iscsi_cls_session *
5d91e209
MC		 1022iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1023 int dd_size)
7b8631b5
MC		 1024{
1025 struct iscsi_cls_session *session;
7b8631b5 1026
5d91e209 1027 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 1028 GFP_KERNEL);
7b8631b5 1029 if (!session)
f53a88da
MC		 1030 return NULL;
1031
7b8631b5 1032 session->transport = transport;
0c70d84b 1033 session->creator = -1;
30a6c652 1034 session->recovery_tmo = 120;
6eabafbe 1035 session->state = ISCSI_SESSION_FREE;
c4028958 1036 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 1037 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 1038 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1039 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 1040 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 1041 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 1042 spin_lock_init(&session->lock);
7b8631b5 1043
6a8a0d36
MC		 1044 /* this is released in the dev's release function */
1045 scsi_host_get(shost);
8434aa8b
MC		 1046 session->dev.parent = &shost->shost_gendev;
1047 session->dev.release = iscsi_session_release;
1048 device_initialize(&session->dev);
5d91e209 1049 if (dd_size)
b5c7a12d 1050 session->dd_data = &session[1];
632248aa
MC		 1051
1052 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 1053 return session;
1054}
1055EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1056
6a8a0d36 1057int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 1058{
1059 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 1060 struct iscsi_cls_host *ihost;
26974789 1061 unsigned long flags;
8d4a690c 1062 int id = 0;
8434aa8b 1063 int err;
b5c7a12d 1064
30a6c652 1065 ihost = shost->shost_data;
41be1444 1066 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b 1067
8d4a690c
MC		 1068 if (target_id == ISCSI_MAX_TARGET) {
1069 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
7970634b 1070
8d4a690c 1071 if (id < 0) {
7970634b 1072 iscsi_cls_session_printk(KERN_ERR, session,
8d4a690c
MC		 1073 "Failure in Target ID Allocation\n");
1074 return id;
7970634b 1075 }
8d4a690c
MC		 1076 session->target_id = (unsigned int)id;
1077 session->ida_used = true;
1078 } else
1079 session->target_id = target_id;
30a6c652 1080
71610f55 1081 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 1082 err = device_add(&session->dev);
7b8631b5 1083 if (err) {
322d739d
MC		 1084 iscsi_cls_session_printk(KERN_ERR, session,
1085 "could not register session's dev\n");
8d4a690c 1086 goto release_ida;
7b8631b5
MC		 1087 }
1088 transport_register_device(&session->dev);
1089
26974789
MC		 1090 spin_lock_irqsave(&sesslock, flags);
1091 list_add(&session->sess_list, &sesslist);
1092 spin_unlock_irqrestore(&sesslock, flags);
1093
26974789 1094 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 1095 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 1096 return 0;
30a6c652 1097
8d4a690c
MC		 1098release_ida:
1099 if (session->ida_used)
1100 ida_simple_remove(&iscsi_sess_ida, session->target_id);
1101
8434aa8b 1102 return err;
7b8631b5 1103}
8434aa8b 1104EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 1105
1106/**
8434aa8b
MC		 1107 * iscsi_create_session - create iscsi class session
1108 * @shost: scsi host
1109 * @transport: iscsi transport
5d91e209 1110 * @dd_size: private driver data size
eb44820c 1111 * @target_id: which target
7b8631b5 1112 *
8434aa8b 1113 * This can be called from a LLD or iscsi_transport.
eb44820c 1114 */
8434aa8b 1115struct iscsi_cls_session *
5d91e209
MC		 1116iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1117 int dd_size, unsigned int target_id)
8434aa8b
MC		 1118{
1119 struct iscsi_cls_session *session;
1120
5d91e209 1121 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 1122 if (!session)
1123 return NULL;
1124
6a8a0d36 1125 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1126 iscsi_free_session(session);
1127 return NULL;
1128 }
1129 return session;
1130}
1131EXPORT_SYMBOL_GPL(iscsi_create_session);
1132
26974789
MC		 1133static void iscsi_conn_release(struct device *dev)
1134{
1135 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1136 struct device *parent = conn->dev.parent;
1137
632248aa 1138 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1139 kfree(conn);
1140 put_device(parent);
1141}
1142
1143static int iscsi_is_conn_dev(const struct device *dev)
1144{
1145 return dev->release == iscsi_conn_release;
1146}
1147
1148static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1149{
1150 if (!iscsi_is_conn_dev(dev))
1151 return 0;
1152 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1153}
1154
8434aa8b 1155void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1156{
30a6c652 1157 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1158 unsigned long flags;
1159 int err;
1160
632248aa
MC		 1161 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1162
26974789
MC		 1163 spin_lock_irqsave(&sesslock, flags);
1164 list_del(&session->sess_list);
1165 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1166
45ab33b6
MC		 1167 /* make sure there are no blocks/unblocks queued */
1168 flush_workqueue(iscsi_eh_timer_workq);
1169 /* make sure the timedout callout is not running */
1170 if (!cancel_delayed_work(&session->recovery_work))
1171 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1172 /*
1173 * If we are blocked let commands flow again. The lld or iscsi
1174 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1175 * We assume that LLD will not be calling block/unblock while
1176 * removing the session.
26974789 1177 */
6eabafbe
MC		 1178 spin_lock_irqsave(&session->lock, flags);
1179 session->state = ISCSI_SESSION_FREE;
1180 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1181
45ab33b6
MC		 1182 scsi_target_unblock(&session->dev);
1183 /* flush running scans then delete devices */
06d25af4 1184 scsi_flush_work(shost);
45ab33b6 1185 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1186
26974789
MC		 1187 /* hw iscsi may not have removed all connections from session */
1188 err = device_for_each_child(&session->dev, NULL,
1189 iscsi_iter_destroy_conn_fn);
1190 if (err)
322d739d
MC		 1191 iscsi_cls_session_printk(KERN_ERR, session,
1192 "Could not delete all connections "
1193 "for session. Error %d.\n", err);
8434aa8b 1194
7b8631b5 1195 transport_unregister_device(&session->dev);
632248aa
MC		 1196
1197 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1198 device_del(&session->dev);
1199}
1200EXPORT_SYMBOL_GPL(iscsi_remove_session);
1201
1202void iscsi_free_session(struct iscsi_cls_session *session)
1203{
632248aa 1204 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1205 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1206 put_device(&session->dev);
7b8631b5 1207}
8434aa8b
MC		 1208EXPORT_SYMBOL_GPL(iscsi_free_session);
1209
1210/**
1211 * iscsi_destroy_session - destroy iscsi session
1212 * @session: iscsi_session
1213 *
1214 * Can be called by a LLD or iscsi_transport. There must not be
1215 * any running connections.
eb44820c 1216 */
8434aa8b
MC		 1217int iscsi_destroy_session(struct iscsi_cls_session *session)
1218{
1219 iscsi_remove_session(session);
632248aa 1220 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1221 iscsi_free_session(session);
1222 return 0;
1223}
7b8631b5
MC		 1224EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1225
7b8631b5
MC		 1226/**
1227 * iscsi_create_conn - create iscsi class connection
1228 * @session: iscsi cls session
5d91e209 1229 * @dd_size: private driver data size
7b8631b5
MC		 1230 * @cid: connection id
1231 *
1232 * This can be called from a LLD or iscsi_transport. The connection
1233 * is child of the session so cid must be unique for all connections
1234 * on the session.
b5c7a12d
MC		 1235 *
1236 * Since we do not support MCS, cid will normally be zero. In some cases
1237 * for software iscsi we could be trying to preallocate a connection struct
1238 * in which case there could be two connection structs and cid would be
1239 * non-zero.
eb44820c 1240 */
7b8631b5 1241struct iscsi_cls_conn *
5d91e209 1242iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1243{
1244 struct iscsi_transport *transport = session->transport;
7b8631b5 1245 struct iscsi_cls_conn *conn;
26974789 1246 unsigned long flags;
7b8631b5
MC		 1247 int err;
1248
5d91e209 1249 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1250 if (!conn)
1251 return NULL;
5d91e209 1252 if (dd_size)
7b8631b5
MC		 1253 conn->dd_data = &conn[1];
1254
22a39fbb 1255 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1256 INIT_LIST_HEAD(&conn->conn_list);
1257 conn->transport = transport;
b5c7a12d 1258 conn->cid = cid;
7b8631b5
MC		 1259
1260 /* this is released in the dev's release function */
1261 if (!get_device(&session->dev))
43a145a3 1262 goto free_conn;
b5c7a12d 1263
71610f55 1264 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1265 conn->dev.parent = &session->dev;
1266 conn->dev.release = iscsi_conn_release;
1267 err = device_register(&conn->dev);
1268 if (err) {
322d739d
MC		 1269 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1270 "register connection's dev\n");
7b8631b5
MC		 1271 goto release_parent_ref;
1272 }
1273 transport_register_device(&conn->dev);
26974789
MC		 1274
1275 spin_lock_irqsave(&connlock, flags);
1276 list_add(&conn->conn_list, &connlist);
26974789 1277 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1278
1279 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1280 return conn;
1281
1282release_parent_ref:
1283 put_device(&session->dev);
1284free_conn:
1285 kfree(conn);
1286 return NULL;
1287}
1288
1289EXPORT_SYMBOL_GPL(iscsi_create_conn);
1290
1291/**
1292 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1293 * @conn: iscsi cls session
7b8631b5 1294 *
26974789 1295 * This can be called from a LLD or iscsi_transport.
eb44820c 1296 */
7b8631b5
MC		 1297int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1298{
26974789
MC		 1299 unsigned long flags;
1300
1301 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1302 list_del(&conn->conn_list);
1303 spin_unlock_irqrestore(&connlock, flags);
1304
7b8631b5 1305 transport_unregister_device(&conn->dev);
632248aa 1306 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1307 device_unregister(&conn->dev);
1308 return 0;
1309}
7b8631b5
MC		 1310EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1311
7b8631b5
MC		 1312/*
1313 * iscsi interface functions
1314 */
0896b752
AA		 1315static struct iscsi_internal *
1316iscsi_if_transport_lookup(struct iscsi_transport *tt)
1317{
1318 struct iscsi_internal *priv;
1319 unsigned long flags;
1320
1321 spin_lock_irqsave(&iscsi_transport_lock, flags);
1322 list_for_each_entry(priv, &iscsi_transports, list) {
1323 if (tt == priv->iscsi_transport) {
1324 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1325 return priv;
1326 }
1327 }
1328 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1329 return NULL;
1330}
1da177e4 1331
53cb8a1f 1332static int
43514774 1333iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1334{
43514774 1335 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1336}
1da177e4 1337
7b7232f3 1338int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1339 char *data, uint32_t data_size)
1da177e4 1340{
0896b752
AA		 1341 struct nlmsghdr *nlh;
1342 struct sk_buff *skb;
1343 struct iscsi_uevent *ev;
0896b752 1344 char *pdu;
790f39a2 1345 struct iscsi_internal *priv;
0896b752
AA		 1346 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1347 data_size);
1348
790f39a2
MC		 1349 priv = iscsi_if_transport_lookup(conn->transport);
1350 if (!priv)
1351 return -EINVAL;
1352
43a145a3 1353 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1354 if (!skb) {
e5bd7b54 1355 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1356 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1357 "control PDU: OOM\n");
0896b752
AA		 1358 return -ENOMEM;
1359 }
1da177e4 1360
43514774 1361 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1362 ev = NLMSG_DATA(nlh);
1363 memset(ev, 0, sizeof(*ev));
1364 ev->transport_handle = iscsi_handle(conn->transport);
1365 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1366 ev->r.recv_req.cid = conn->cid;
1367 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1368 pdu = (char*)ev + sizeof(*ev);
1369 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1370 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1371
43514774 1372 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1373}
0896b752 1374EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1375
43514774
MC		 1376int iscsi_offload_mesg(struct Scsi_Host *shost,
1377 struct iscsi_transport *transport, uint32_t type,
1378 char *data, uint16_t data_size)
1379{
1380 struct nlmsghdr *nlh;
1381 struct sk_buff *skb;
1382 struct iscsi_uevent *ev;
1383 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1384
a541f840 1385 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1386 if (!skb) {
1387 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1388 return -ENOMEM;
1389 }
1390
1391 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1392 ev = NLMSG_DATA(nlh);
1393 memset(ev, 0, sizeof(*ev));
1394 ev->type = type;
1395 ev->transport_handle = iscsi_handle(transport);
1396 switch (type) {
1397 case ISCSI_KEVENT_PATH_REQ:
1398 ev->r.req_path.host_no = shost->host_no;
1399 break;
1400 case ISCSI_KEVENT_IF_DOWN:
1401 ev->r.notify_if_down.host_no = shost->host_no;
1402 break;
1403 }
1404
1405 memcpy((char *)ev + sizeof(*ev), data, data_size);
1406
a541f840 1407 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1408}
1409EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1410
e5bd7b54 1411void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1412{
0896b752
AA		 1413 struct nlmsghdr *nlh;
1414 struct sk_buff *skb;
1415 struct iscsi_uevent *ev;
790f39a2 1416 struct iscsi_internal *priv;
0896b752
AA		 1417 int len = NLMSG_SPACE(sizeof(*ev));
1418
790f39a2
MC		 1419 priv = iscsi_if_transport_lookup(conn->transport);
1420 if (!priv)
1421 return;
1422
43a145a3 1423 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1424 if (!skb) {
322d739d
MC		 1425 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1426 "conn error (%d)\n", error);
0896b752
AA		 1427 return;
1428 }
1429
43514774 1430 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1431 ev = NLMSG_DATA(nlh);
1432 ev->transport_handle = iscsi_handle(conn->transport);
1433 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1434 ev->r.connerror.error = error;
b5c7a12d
MC		 1435 ev->r.connerror.cid = conn->cid;
1436 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1437
43514774 1438 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1439
322d739d
MC		 1440 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1441 error);
0896b752 1442}
e5bd7b54 1443EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752 1444
17fa575e
MR		 1445void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1446 enum iscsi_conn_state state)
1447{
1448 struct nlmsghdr *nlh;
1449 struct sk_buff *skb;
1450 struct iscsi_uevent *ev;
1451 struct iscsi_internal *priv;
1452 int len = NLMSG_SPACE(sizeof(*ev));
1453
1454 priv = iscsi_if_transport_lookup(conn->transport);
1455 if (!priv)
1456 return;
1457
1458 skb = alloc_skb(len, GFP_ATOMIC);
1459 if (!skb) {
1460 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1461 "conn login (%d)\n", state);
1462 return;
1463 }
1464
1465 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1466 ev = NLMSG_DATA(nlh);
1467 ev->transport_handle = iscsi_handle(conn->transport);
1468 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1469 ev->r.conn_login.state = state;
1470 ev->r.conn_login.cid = conn->cid;
1471 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1472 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1473
1474 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1475 state);
1476}
1477EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1478
a11e2545
VC		 1479void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
1480 enum iscsi_host_event_code code, uint32_t data_size,
1481 uint8_t *data)
1482{
1483 struct nlmsghdr *nlh;
1484 struct sk_buff *skb;
1485 struct iscsi_uevent *ev;
1486 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1487
1488 skb = alloc_skb(len, GFP_KERNEL);
1489 if (!skb) {
1490 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
1491 host_no, code);
1492 return;
1493 }
1494
1495 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1496 ev = NLMSG_DATA(nlh);
1497 ev->transport_handle = iscsi_handle(transport);
1498 ev->type = ISCSI_KEVENT_HOST_EVENT;
1499 ev->r.host_event.host_no = host_no;
1500 ev->r.host_event.code = code;
1501 ev->r.host_event.data_size = data_size;
1502
1503 if (data_size)
1504 memcpy((char *)ev + sizeof(*ev), data, data_size);
1505
1506 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1507}
1508EXPORT_SYMBOL_GPL(iscsi_post_host_event);
1509
ac20c7bf
VC		 1510void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
1511 uint32_t status, uint32_t pid, uint32_t data_size,
1512 uint8_t *data)
1513{
1514 struct nlmsghdr *nlh;
1515 struct sk_buff *skb;
1516 struct iscsi_uevent *ev;
1517 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1518
1519 skb = alloc_skb(len, GFP_KERNEL);
1520 if (!skb) {
1521 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
1522 return;
1523 }
1524
1525 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1526 ev = NLMSG_DATA(nlh);
1527 ev->transport_handle = iscsi_handle(transport);
1528 ev->type = ISCSI_KEVENT_PING_COMP;
1529 ev->r.ping_comp.host_no = host_no;
1530 ev->r.ping_comp.status = status;
1531 ev->r.ping_comp.pid = pid;
1532 ev->r.ping_comp.data_size = data_size;
1533 memcpy((char *)ev + sizeof(*ev), data, data_size);
1534
1535 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1536}
1537EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
1538
0896b752 1539static int
43514774
MC		 1540iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1541 void *payload, int size)
0896b752
AA		 1542{
1543 struct sk_buff *skb;
1544 struct nlmsghdr *nlh;
1545 int len = NLMSG_SPACE(size);
1546 int flags = multi ? NLM_F_MULTI : 0;
1547 int t = done ? NLMSG_DONE : type;
1548
43a145a3 1549 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1550 if (!skb) {
1551 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1552 return -ENOMEM;
1553 }
0896b752 1554
43514774 1555 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1556 nlh->nlmsg_flags = flags;
1557 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1558 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1559}
1da177e4 1560
7b8631b5 1561static int
5b940adf 1562iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1563{
1564 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1565 struct iscsi_stats *stats;
1566 struct sk_buff *skbstat;
1567 struct iscsi_cls_conn *conn;
1568 struct nlmsghdr *nlhstat;
1569 struct iscsi_uevent *evstat;
790f39a2 1570 struct iscsi_internal *priv;
7b8631b5
MC		 1571 int len = NLMSG_SPACE(sizeof(*ev) +
1572 sizeof(struct iscsi_stats) +
1573 sizeof(struct iscsi_stats_custom) *
1574 ISCSI_STATS_CUSTOM_MAX);
1575 int err = 0;
0896b752 1576
790f39a2
MC		 1577 priv = iscsi_if_transport_lookup(transport);
1578 if (!priv)
1579 return -EINVAL;
1580
b5c7a12d 1581 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1582 if (!conn)
1583 return -EEXIST;
0896b752 1584
7b8631b5
MC		 1585 do {
1586 int actual_size;
0896b752 1587
43a145a3 1588 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1589 if (!skbstat) {
322d739d
MC		 1590 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1591 "deliver stats: OOM\n");
7b8631b5
MC		 1592 return -ENOMEM;
1593 }
1594
43514774 1595 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1596 (len - sizeof(*nlhstat)), 0);
1597 evstat = NLMSG_DATA(nlhstat);
1598 memset(evstat, 0, sizeof(*evstat));
1599 evstat->transport_handle = iscsi_handle(conn->transport);
1600 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1601 evstat->u.get_stats.cid =
1602 ev->u.get_stats.cid;
1603 evstat->u.get_stats.sid =
1604 ev->u.get_stats.sid;
7b8631b5
MC		 1605 stats = (struct iscsi_stats *)
1606 ((char*)evstat + sizeof(*evstat));
1607 memset(stats, 0, sizeof(*stats));
1608
7b7232f3 1609 transport->get_stats(conn, stats);
7b8631b5
MC		 1610 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1611 sizeof(struct iscsi_stats) +
1612 sizeof(struct iscsi_stats_custom) *
1613 stats->custom_length);
1614 actual_size -= sizeof(*nlhstat);
1615 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1616 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1617 nlhstat->nlmsg_len = actual_size;
1618
43514774
MC		 1619 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1620 GFP_ATOMIC);
7b8631b5
MC		 1621 } while (err < 0 && err != -ECONNREFUSED);
1622
1623 return err;
0896b752
AA		 1624}
1625
53cb8a1f 1626/**
26974789
MC		 1627 * iscsi_session_event - send session destr. completion event
1628 * @session: iscsi class session
1629 * @event: type of event
eb44820c 1630 */
26974789
MC		 1631int iscsi_session_event(struct iscsi_cls_session *session,
1632 enum iscsi_uevent_e event)
53cb8a1f
MC		 1633{
1634 struct iscsi_internal *priv;
53cb8a1f
MC		 1635 struct Scsi_Host *shost;
1636 struct iscsi_uevent *ev;
1637 struct sk_buff *skb;
1638 struct nlmsghdr *nlh;
53cb8a1f
MC		 1639 int rc, len = NLMSG_SPACE(sizeof(*ev));
1640
26974789 1641 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1642 if (!priv)
1643 return -EINVAL;
53cb8a1f
MC		 1644 shost = iscsi_session_to_shost(session);
1645
43a145a3 1646 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1647 if (!skb) {
322d739d
MC		 1648 iscsi_cls_session_printk(KERN_ERR, session,
1649 "Cannot notify userspace of session "
1650 "event %u\n", event);
53cb8a1f
MC		 1651 return -ENOMEM;
1652 }
1653
43514774 1654 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1655 ev = NLMSG_DATA(nlh);
26974789 1656 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1657
26974789
MC		 1658 ev->type = event;
1659 switch (event) {
1660 case ISCSI_KEVENT_DESTROY_SESSION:
1661 ev->r.d_session.host_no = shost->host_no;
1662 ev->r.d_session.sid = session->sid;
1663 break;
1664 case ISCSI_KEVENT_CREATE_SESSION:
1665 ev->r.c_session_ret.host_no = shost->host_no;
1666 ev->r.c_session_ret.sid = session->sid;
1667 break;
1668 case ISCSI_KEVENT_UNBIND_SESSION:
1669 ev->r.unbind_session.host_no = shost->host_no;
1670 ev->r.unbind_session.sid = session->sid;
1671 break;
1672 default:
322d739d
MC		 1673 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1674 "%u.\n", event);
26974789 1675 kfree_skb(skb);
53cb8a1f 1676 return -EINVAL;
53cb8a1f
MC		 1677 }
1678
53cb8a1f
MC		 1679 /*
1680 * this will occur if the daemon is not up, so we just warn
1681 * the user and when the daemon is restarted it will handle it
1682 */
43514774 1683 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1684 if (rc == -ESRCH)
322d739d
MC		 1685 iscsi_cls_session_printk(KERN_ERR, session,
1686 "Cannot notify userspace of session "
1687 "event %u. Check iscsi daemon\n",
1688 event);
632248aa
MC		 1689
1690 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1691 event, rc);
53cb8a1f
MC		 1692 return rc;
1693}
26974789 1694EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1695
0896b752 1696static int
d82ff9be 1697iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
0c70d84b
MC		 1698 struct iscsi_uevent *ev, pid_t pid,
1699 uint32_t initial_cmdsn, uint16_t cmds_max,
1700 uint16_t queue_depth)
0896b752
AA		 1701{
1702 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1703 struct iscsi_cls_session *session;
5e7facb7 1704 struct Scsi_Host *shost;
0896b752 1705
d82ff9be 1706 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1707 initial_cmdsn);
7b7232f3 1708 if (!session)
7b8631b5 1709 return -ENOMEM;
0896b752 1710
0c70d84b 1711 session->creator = pid;
5e7facb7
MC		 1712 shost = iscsi_session_to_shost(session);
1713 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1714 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1715 ISCSI_DBG_TRANS_SESSION(session,
1716 "Completed creating transport session\n");
0896b752 1717 return 0;
0896b752
AA		 1718}
1719
1720static int
7b7232f3 1721iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1722{
7b8631b5 1723 struct iscsi_cls_conn *conn;
7b7232f3 1724 struct iscsi_cls_session *session;
7b8631b5 1725
b5c7a12d
MC		 1726 session = iscsi_session_lookup(ev->u.c_conn.sid);
1727 if (!session) {
322d739d 1728 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1729 ev->u.c_conn.sid);
7b8631b5 1730 return -EINVAL;
b5c7a12d 1731 }
0896b752 1732
7b7232f3 1733 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1734 if (!conn) {
322d739d
MC		 1735 iscsi_cls_session_printk(KERN_ERR, session,
1736 "couldn't create a new connection.");
7b7232f3 1737 return -ENOMEM;
b5c7a12d 1738 }
0896b752 1739
b5c7a12d
MC		 1740 ev->r.c_conn_ret.sid = session->sid;
1741 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1742
1743 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1744 return 0;
1da177e4
LT		 1745}
1746
0896b752
AA		 1747static int
1748iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1749{
7b8631b5 1750 struct iscsi_cls_conn *conn;
0896b752 1751
b5c7a12d 1752 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1753 if (!conn)
7b8631b5 1754 return -EINVAL;
0896b752 1755
632248aa 1756 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1757 if (transport->destroy_conn)
1758 transport->destroy_conn(conn);
632248aa 1759
7b8631b5 1760 return 0;
0896b752
AA		 1761}
1762
fd7255f5
MC		 1763static int
1764iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1765{
1766 char *data = (char*)ev + sizeof(*ev);
1767 struct iscsi_cls_conn *conn;
1768 struct iscsi_cls_session *session;
a54a52ca 1769 int err = 0, value = 0;
fd7255f5
MC		 1770
1771 session = iscsi_session_lookup(ev->u.set_param.sid);
1772 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1773 if (!conn || !session)
1774 return -EINVAL;
1775
1776 switch (ev->u.set_param.param) {
30a6c652 1777 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1778 sscanf(data, "%d", &value);
fdd46dcb 1779 session->recovery_tmo = value;
30a6c652 1780 break;
fd7255f5 1781 default:
a54a52ca
MC		 1782 err = transport->set_param(conn, ev->u.set_param.param,
1783 data, ev->u.set_param.len);
fd7255f5
MC		 1784 }
1785
1786 return err;
1787}
1788
10eb0f01
MC		 1789static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1790 struct iscsi_uevent *ev, int msg_type)
1791{
1792 struct iscsi_endpoint *ep;
1793 struct sockaddr *dst_addr;
1794 struct Scsi_Host *shost = NULL;
1795 int non_blocking, err = 0;
1796
1797 if (!transport->ep_connect)
1798 return -EINVAL;
1799
1800 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1801 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1802 if (!shost) {
1803 printk(KERN_ERR "ep connect failed. Could not find "
1804 "host no %u\n",
1805 ev->u.ep_connect_through_host.host_no);
1806 return -ENODEV;
1807 }
1808 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1809 } else
1810 non_blocking = ev->u.ep_connect.non_blocking;
1811
1812 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1813 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1814 if (IS_ERR(ep)) {
1815 err = PTR_ERR(ep);
1816 goto release_host;
1817 }
1818
1819 ev->r.ep_connect_ret.handle = ep->id;
1820release_host:
1821 if (shost)
1822 scsi_host_put(shost);
1823 return err;
1824}
1825
22a39fbb
MC		 1826static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1827 u64 ep_handle)
1828{
1829 struct iscsi_cls_conn *conn;
1830 struct iscsi_endpoint *ep;
1831
1832 if (!transport->ep_disconnect)
1833 return -EINVAL;
1834
1835 ep = iscsi_lookup_endpoint(ep_handle);
1836 if (!ep)
1837 return -EINVAL;
1838 conn = ep->conn;
1839 if (conn) {
1840 mutex_lock(&conn->ep_mutex);
1841 conn->ep = NULL;
1842 mutex_unlock(&conn->ep_mutex);
1843 }
1844
1845 transport->ep_disconnect(ep);
1846 return 0;
1847}
1848
264faaaa
OG		 1849static int
1850iscsi_if_transport_ep(struct iscsi_transport *transport,
1851 struct iscsi_uevent *ev, int msg_type)
1852{
d82ff9be 1853 struct iscsi_endpoint *ep;
264faaaa
OG		 1854 int rc = 0;
1855
1856 switch (msg_type) {
10eb0f01 1857 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1858 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1859 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1860 break;
1861 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1862 if (!transport->ep_poll)
1863 return -EINVAL;
1864
d82ff9be
MC		 1865 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1866 if (!ep)
1867 return -EINVAL;
1868
1869 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1870 ev->u.ep_poll.timeout_ms);
1871 break;
1872 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1873 rc = iscsi_if_ep_disconnect(transport,
1874 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1875 break;
1876 }
1877 return rc;
1878}
1879
01cb225d
MC		 1880static int
1881iscsi_tgt_dscvr(struct iscsi_transport *transport,
1882 struct iscsi_uevent *ev)
1883{
2174a04e 1884 struct Scsi_Host *shost;
01cb225d 1885 struct sockaddr *dst_addr;
2174a04e 1886 int err;
01cb225d
MC		 1887
1888 if (!transport->tgt_dscvr)
1889 return -EINVAL;
1890
2174a04e 1891 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1892 if (!shost) {
2174a04e
MC		 1893 printk(KERN_ERR "target discovery could not find host no %u\n",
1894 ev->u.tgt_dscvr.host_no);
1895 return -ENODEV;
1896 }
1897
1898
01cb225d 1899 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1900 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1901 ev->u.tgt_dscvr.enable, dst_addr);
1902 scsi_host_put(shost);
1903 return err;
01cb225d
MC		 1904}
1905
1d9bf13a
MC		 1906static int
1907iscsi_set_host_param(struct iscsi_transport *transport,
1908 struct iscsi_uevent *ev)
1909{
1910 char *data = (char*)ev + sizeof(*ev);
1911 struct Scsi_Host *shost;
1912 int err;
1913
1914 if (!transport->set_host_param)
1915 return -ENOSYS;
1916
1917 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1918 if (!shost) {
1d9bf13a
MC		 1919 printk(KERN_ERR "set_host_param could not find host no %u\n",
1920 ev->u.set_host_param.host_no);
1921 return -ENODEV;
1922 }
1923
1924 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1925 data, ev->u.set_host_param.len);
1926 scsi_host_put(shost);
1927 return err;
1928}
1929
0896b752 1930static int
43514774
MC		 1931iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1932{
1933 struct Scsi_Host *shost;
1934 struct iscsi_path *params;
1935 int err;
1936
1937 if (!transport->set_path)
1938 return -ENOSYS;
1939
1940 shost = scsi_host_lookup(ev->u.set_path.host_no);
1941 if (!shost) {
1942 printk(KERN_ERR "set path could not find host no %u\n",
1943 ev->u.set_path.host_no);
1944 return -ENODEV;
1945 }
1946
1947 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1948 err = transport->set_path(shost, params);
1949
1950 scsi_host_put(shost);
1951 return err;
1952}
1953
56c155b5
MC		 1954static int
1955iscsi_set_iface_params(struct iscsi_transport *transport,
00c31889 1956 struct iscsi_uevent *ev, uint32_t len)
56c155b5
MC		 1957{
1958 char *data = (char *)ev + sizeof(*ev);
1959 struct Scsi_Host *shost;
1960 int err;
1961
1962 if (!transport->set_iface_param)
1963 return -ENOSYS;
1964
1965 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1966 if (!shost) {
1967 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1968 ev->u.set_iface_params.host_no);
1969 return -ENODEV;
1970 }
1971
00c31889 1972 err = transport->set_iface_param(shost, data, len);
56c155b5
MC		 1973 scsi_host_put(shost);
1974 return err;
1975}
1976
ac20c7bf
VC		 1977static int
1978iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1979{
1980 struct Scsi_Host *shost;
1981 struct sockaddr *dst_addr;
1982 int err;
1983
1984 if (!transport->send_ping)
1985 return -ENOSYS;
1986
1987 shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
1988 if (!shost) {
1989 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
1990 ev->u.iscsi_ping.host_no);
1991 return -ENODEV;
1992 }
1993
1994 dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
1995 err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
1996 ev->u.iscsi_ping.iface_type,
1997 ev->u.iscsi_ping.payload_size,
1998 ev->u.iscsi_ping.pid,
1999 dst_addr);
2000 scsi_host_put(shost);
2001 return err;
2002}
2003
43514774
MC		 2004static int
2005iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 2006{
2007 int err = 0;
2008 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
2009 struct iscsi_transport *transport = NULL;
2010 struct iscsi_internal *priv;
7b7232f3
MC		 2011 struct iscsi_cls_session *session;
2012 struct iscsi_cls_conn *conn;
d82ff9be 2013 struct iscsi_endpoint *ep = NULL;
0896b752 2014
43514774
MC		 2015 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
2016 *group = ISCSI_NL_GRP_UIP;
2017 else
2018 *group = ISCSI_NL_GRP_ISCSID;
2019
0896b752
AA		 2020 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
2021 if (!priv)
2022 return -EINVAL;
2023 transport = priv->iscsi_transport;
2024
7b7232f3
MC		 2025 if (!try_module_get(transport->owner))
2026 return -EINVAL;
2027
0896b752
AA		 2028 switch (nlh->nlmsg_type) {
2029 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 2030 err = iscsi_if_create_session(priv, ep, ev,
df1c7bab 2031 NETLINK_CB(skb).pid,
40753caa
MC		 2032 ev->u.c_session.initial_cmdsn,
2033 ev->u.c_session.cmds_max,
2034 ev->u.c_session.queue_depth);
2035 break;
2036 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 2037 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 2038 if (!ep) {
2039 err = -EINVAL;
2040 break;
2041 }
d82ff9be
MC		 2042
2043 err = iscsi_if_create_session(priv, ep, ev,
df1c7bab 2044 NETLINK_CB(skb).pid,
40753caa
MC		 2045 ev->u.c_bound_session.initial_cmdsn,
2046 ev->u.c_bound_session.cmds_max,
2047 ev->u.c_bound_session.queue_depth);
0896b752
AA		 2048 break;
2049 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 2050 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 2051 if (session)
7b7232f3 2052 transport->destroy_session(session);
26974789
MC		 2053 else
2054 err = -EINVAL;
2055 break;
2056 case ISCSI_UEVENT_UNBIND_SESSION:
2057 session = iscsi_session_lookup(ev->u.d_session.sid);
2058 if (session)
06d25af4
MC		 2059 scsi_queue_work(iscsi_session_to_shost(session),
2060 &session->unbind_work);
26974789 2061 else
7b7232f3 2062 err = -EINVAL;
0896b752
AA		 2063 break;
2064 case ISCSI_UEVENT_CREATE_CONN:
2065 err = iscsi_if_create_conn(transport, ev);
2066 break;
2067 case ISCSI_UEVENT_DESTROY_CONN:
2068 err = iscsi_if_destroy_conn(transport, ev);
2069 break;
2070 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 2071 session = iscsi_session_lookup(ev->u.b_conn.sid);
2072 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 2073
22a39fbb
MC		 2074 if (conn && conn->ep)
2075 iscsi_if_ep_disconnect(transport, conn->ep->id);
2076
2077 if (!session || !conn) {
7b7232f3 2078 err = -EINVAL;
22a39fbb
MC		 2079 break;
2080 }
2081
2082 ev->r.retcode = transport->bind_conn(session, conn,
2083 ev->u.b_conn.transport_eph,
2084 ev->u.b_conn.is_leading);
2085 if (ev->r.retcode || !transport->ep_connect)
2086 break;
2087
2088 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2089 if (ep) {
2090 ep->conn = conn;
2091
2092 mutex_lock(&conn->ep_mutex);
2093 conn->ep = ep;
2094 mutex_unlock(&conn->ep_mutex);
2095 } else
2096 iscsi_cls_conn_printk(KERN_ERR, conn,
2097 "Could not set ep conn "
2098 "binding\n");
0896b752
AA		 2099 break;
2100 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 2101 err = iscsi_set_param(transport, ev);
0896b752
AA		 2102 break;
2103 case ISCSI_UEVENT_START_CONN:
b5c7a12d 2104 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 2105 if (conn)
2106 ev->r.retcode = transport->start_conn(conn);
2107 else
2108 err = -EINVAL;
0896b752
AA		 2109 break;
2110 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 2111 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 2112 if (conn)
2113 transport->stop_conn(conn, ev->u.stop_conn.flag);
2114 else
2115 err = -EINVAL;
0896b752
AA		 2116 break;
2117 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 2118 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 2119 if (conn)
2120 ev->r.retcode = transport->send_pdu(conn,
2121 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2122 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2123 ev->u.send_pdu.data_size);
2124 else
2125 err = -EINVAL;
0896b752
AA		 2126 break;
2127 case ISCSI_UEVENT_GET_STATS:
5b940adf 2128 err = iscsi_if_get_stats(transport, nlh);
0896b752 2129 break;
264faaaa
OG		 2130 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2131 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2132 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 2133 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 2134 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2135 break;
01cb225d
MC		 2136 case ISCSI_UEVENT_TGT_DSCVR:
2137 err = iscsi_tgt_dscvr(transport, ev);
2138 break;
1d9bf13a
MC		 2139 case ISCSI_UEVENT_SET_HOST_PARAM:
2140 err = iscsi_set_host_param(transport, ev);
2141 break;
43514774
MC		 2142 case ISCSI_UEVENT_PATH_UPDATE:
2143 err = iscsi_set_path(transport, ev);
2144 break;
56c155b5 2145 case ISCSI_UEVENT_SET_IFACE_PARAMS:
00c31889
MC		 2146 err = iscsi_set_iface_params(transport, ev,
2147 nlmsg_attrlen(nlh, sizeof(*ev)));
56c155b5 2148 break;
ac20c7bf
VC		 2149 case ISCSI_UEVENT_PING:
2150 err = iscsi_send_ping(transport, ev);
2151 break;
0896b752 2152 default:
1d9bf13a 2153 err = -ENOSYS;
0896b752
AA		 2154 break;
2155 }
2156
7b7232f3 2157 module_put(transport->owner);
0896b752
AA		 2158 return err;
2159}
2160
b5c7a12d 2161/*
cd40b7d3
DL		 2162 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
2163 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 2164 */
0896b752 2165static void
cd40b7d3 2166iscsi_if_rx(struct sk_buff *skb)
0896b752 2167{
0b950672 2168 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 2169 while (skb->len >= NLMSG_SPACE(0)) {
2170 int err;
2171 uint32_t rlen;
2172 struct nlmsghdr *nlh;
2173 struct iscsi_uevent *ev;
43514774 2174 uint32_t group;
cd40b7d3
DL		 2175
2176 nlh = nlmsg_hdr(skb);
2177 if (nlh->nlmsg_len < sizeof(*nlh) ||
2178 skb->len < nlh->nlmsg_len) {
2179 break;
ee7f8e40 2180 }
ee7f8e40 2181
cd40b7d3
DL		 2182 ev = NLMSG_DATA(nlh);
2183 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2184 if (rlen > skb->len)
2185 rlen = skb->len;
0896b752 2186
43514774 2187 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 2188 if (err) {
2189 ev->type = ISCSI_KEVENT_IF_ERROR;
2190 ev->iferror = err;
0896b752 2191 }
cd40b7d3
DL		 2192 do {
2193 /*
2194 * special case for GET_STATS:
2195 * on success - sending reply and stats from
2196 * inside of if_recv_msg(),
2197 * on error - fall through.
2198 */
2199 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2200 break;
43514774 2201 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3 2202 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
46a7c17d 2203 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
cd40b7d3 2204 skb_pull(skb, rlen);
0896b752 2205 }
0b950672 2206 mutex_unlock(&rx_queue_mutex);
0896b752 2207}
1da177e4 2208
fd7255f5 2209#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 2210struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 2211 __ATTR(_name,_mode,_show,_store)
2212
1da177e4 2213/*
0896b752 2214 * iSCSI connection attrs
1da177e4 2215 */
a54a52ca 2216#define iscsi_conn_attr_show(param) \
0896b752 2217static ssize_t \
ee959b00
TJ		 2218show_conn_param_##param(struct device *dev, \
2219 struct device_attribute *attr, char *buf) \
0896b752 2220{ \
ee959b00 2221 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 2222 struct iscsi_transport *t = conn->transport; \
a54a52ca 2223 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 2224}
2225
a54a52ca
MC		 2226#define iscsi_conn_attr(field, param) \
2227 iscsi_conn_attr_show(param) \
2228static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 2229 NULL);
0896b752 2230
a54a52ca
MC		 2231iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2232iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2233iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2234iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2235iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2236iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2237iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 2238iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2239iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 2240iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2241iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 2242
289324b0
MC		 2243#define iscsi_conn_ep_attr_show(param) \
2244static ssize_t show_conn_ep_param_##param(struct device *dev, \
2245 struct device_attribute *attr,\
2246 char *buf) \
2247{ \
2248 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2249 struct iscsi_transport *t = conn->transport; \
2250 struct iscsi_endpoint *ep; \
2251 ssize_t rc; \
2252 \
2253 /* \
2254 * Need to make sure ep_disconnect does not free the LLD's \
2255 * interconnect resources while we are trying to read them. \
2256 */ \
2257 mutex_lock(&conn->ep_mutex); \
2258 ep = conn->ep; \
2259 if (!ep && t->ep_connect) { \
2260 mutex_unlock(&conn->ep_mutex); \
2261 return -ENOTCONN; \
2262 } \
2263 \
2264 if (ep) \
2265 rc = t->get_ep_param(ep, param, buf); \
2266 else \
2267 rc = t->get_conn_param(conn, param, buf); \
2268 mutex_unlock(&conn->ep_mutex); \
2269 return rc; \
2270}
2271
2272#define iscsi_conn_ep_attr(field, param) \
2273 iscsi_conn_ep_attr_show(param) \
2274static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2275 show_conn_ep_param_##param, NULL);
2276
2277iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2278iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2279
3128c6c7
MC		 2280static struct attribute *iscsi_conn_attrs[] = {
2281 &dev_attr_conn_max_recv_dlength.attr,
2282 &dev_attr_conn_max_xmit_dlength.attr,
2283 &dev_attr_conn_header_digest.attr,
2284 &dev_attr_conn_data_digest.attr,
2285 &dev_attr_conn_ifmarker.attr,
2286 &dev_attr_conn_ofmarker.attr,
2287 &dev_attr_conn_address.attr,
2288 &dev_attr_conn_port.attr,
2289 &dev_attr_conn_exp_statsn.attr,
2290 &dev_attr_conn_persistent_address.attr,
2291 &dev_attr_conn_persistent_port.attr,
2292 &dev_attr_conn_ping_tmo.attr,
2293 &dev_attr_conn_recv_tmo.attr,
2294 NULL,
2295};
2296
587a1f16 2297static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3128c6c7
MC		 2298 struct attribute *attr, int i)
2299{
2300 struct device *cdev = container_of(kobj, struct device, kobj);
2301 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2302 struct iscsi_transport *t = conn->transport;
2303 int param;
2304
2305 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2306 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2307 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2308 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2309 else if (attr == &dev_attr_conn_header_digest.attr)
2310 param = ISCSI_PARAM_HDRDGST_EN;
2311 else if (attr == &dev_attr_conn_data_digest.attr)
2312 param = ISCSI_PARAM_DATADGST_EN;
2313 else if (attr == &dev_attr_conn_ifmarker.attr)
2314 param = ISCSI_PARAM_IFMARKER_EN;
2315 else if (attr == &dev_attr_conn_ofmarker.attr)
2316 param = ISCSI_PARAM_OFMARKER_EN;
2317 else if (attr == &dev_attr_conn_address.attr)
2318 param = ISCSI_PARAM_CONN_ADDRESS;
2319 else if (attr == &dev_attr_conn_port.attr)
2320 param = ISCSI_PARAM_CONN_PORT;
2321 else if (attr == &dev_attr_conn_exp_statsn.attr)
2322 param = ISCSI_PARAM_EXP_STATSN;
2323 else if (attr == &dev_attr_conn_persistent_address.attr)
2324 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2325 else if (attr == &dev_attr_conn_persistent_port.attr)
2326 param = ISCSI_PARAM_PERSISTENT_PORT;
2327 else if (attr == &dev_attr_conn_ping_tmo.attr)
2328 param = ISCSI_PARAM_PING_TMO;
2329 else if (attr == &dev_attr_conn_recv_tmo.attr)
2330 param = ISCSI_PARAM_RECV_TMO;
2331 else {
2332 WARN_ONCE(1, "Invalid conn attr");
2333 return 0;
2334 }
2335
2336 return t->attr_is_visible(ISCSI_PARAM, param);
2337}
2338
2339static struct attribute_group iscsi_conn_group = {
2340 .attrs = iscsi_conn_attrs,
2341 .is_visible = iscsi_conn_attr_is_visible,
2342};
2343
1da177e4 2344/*
0896b752 2345 * iSCSI session attrs
1da177e4 2346 */
b2c64167 2347#define iscsi_session_attr_show(param, perm) \
fd7255f5 2348static ssize_t \
ee959b00
TJ		 2349show_session_param_##param(struct device *dev, \
2350 struct device_attribute *attr, char *buf) \
fd7255f5 2351{ \
ee959b00
TJ		 2352 struct iscsi_cls_session *session = \
2353 iscsi_dev_to_session(dev->parent); \
fd7255f5 2354 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2355 \
2356 if (perm && !capable(CAP_SYS_ADMIN)) \
2357 return -EACCES; \
a54a52ca 2358 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2359}
2360
b2c64167
MC		 2361#define iscsi_session_attr(field, param, perm) \
2362 iscsi_session_attr_show(param, perm) \
a54a52ca 2363static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5 2364 NULL);
b2c64167
MC		 2365iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2366iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2367iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2368iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2369iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2370iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2371iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2372iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2373iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2374iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2375iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2376iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2377iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2378iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 2379iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2380iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2381iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2382iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2383iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2384iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2385iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2386
6eabafbe 2387static ssize_t
ee959b00
TJ		 2388show_priv_session_state(struct device *dev, struct device_attribute *attr,
2389 char *buf)
6eabafbe 2390{
ee959b00 2391 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2392 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2393}
2394static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2395 NULL);
0c70d84b
MC		 2396static ssize_t
2397show_priv_session_creator(struct device *dev, struct device_attribute *attr,
2398 char *buf)
2399{
2400 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2401 return sprintf(buf, "%d\n", session->creator);
2402}
2403static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
2404 NULL);
6eabafbe 2405
fd7255f5
MC		 2406#define iscsi_priv_session_attr_show(field, format) \
2407static ssize_t \
ee959b00
TJ		 2408show_priv_session_##field(struct device *dev, \
2409 struct device_attribute *attr, char *buf) \
fd7255f5 2410{ \
ee959b00
TJ		 2411 struct iscsi_cls_session *session = \
2412 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2413 if (session->field == -1) \
2414 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2415 return sprintf(buf, format"\n", session->field); \
2416}
2417
fe4f0bde
VC		 2418#define iscsi_priv_session_attr_store(field) \
2419static ssize_t \
2420store_priv_session_##field(struct device *dev, \
2421 struct device_attribute *attr, \
2422 const char *buf, size_t count) \
2423{ \
2424 int val; \
2425 char *cp; \
2426 struct iscsi_cls_session *session = \
2427 iscsi_dev_to_session(dev->parent); \
2428 if ((session->state == ISCSI_SESSION_FREE) || \
2429 (session->state == ISCSI_SESSION_FAILED)) \
2430 return -EBUSY; \
2431 if (strncmp(buf, "off", 3) == 0) \
2432 session->field = -1; \
2433 else { \
2434 val = simple_strtoul(buf, &cp, 0); \
2435 if (*cp != '\0' && *cp != '\n') \
2436 return -EINVAL; \
2437 session->field = val; \
2438 } \
2439 return count; \
2440}
2441
2442#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2443 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2444 iscsi_priv_session_attr_store(field) \
523f3c80 2445static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2446 show_priv_session_##field, \
2447 store_priv_session_##field)
2448iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2449
1d063c17
MC		 2450static struct attribute *iscsi_session_attrs[] = {
2451 &dev_attr_sess_initial_r2t.attr,
2452 &dev_attr_sess_max_outstanding_r2t.attr,
2453 &dev_attr_sess_immediate_data.attr,
2454 &dev_attr_sess_first_burst_len.attr,
2455 &dev_attr_sess_max_burst_len.attr,
2456 &dev_attr_sess_data_pdu_in_order.attr,
2457 &dev_attr_sess_data_seq_in_order.attr,
2458 &dev_attr_sess_erl.attr,
2459 &dev_attr_sess_targetname.attr,
2460 &dev_attr_sess_tpgt.attr,
2461 &dev_attr_sess_password.attr,
2462 &dev_attr_sess_password_in.attr,
2463 &dev_attr_sess_username.attr,
2464 &dev_attr_sess_username_in.attr,
2465 &dev_attr_sess_fast_abort.attr,
2466 &dev_attr_sess_abort_tmo.attr,
2467 &dev_attr_sess_lu_reset_tmo.attr,
2468 &dev_attr_sess_tgt_reset_tmo.attr,
2469 &dev_attr_sess_ifacename.attr,
2470 &dev_attr_sess_initiatorname.attr,
2471 &dev_attr_sess_targetalias.attr,
2472 &dev_attr_priv_sess_recovery_tmo.attr,
2473 &dev_attr_priv_sess_state.attr,
0c70d84b 2474 &dev_attr_priv_sess_creator.attr,
1d063c17
MC		 2475 NULL,
2476};
2477
587a1f16 2478static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
1d063c17
MC		 2479 struct attribute *attr, int i)
2480{
2481 struct device *cdev = container_of(kobj, struct device, kobj);
2482 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2483 struct iscsi_transport *t = session->transport;
2484 int param;
2485
2486 if (attr == &dev_attr_sess_initial_r2t.attr)
2487 param = ISCSI_PARAM_INITIAL_R2T_EN;
2488 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2489 param = ISCSI_PARAM_MAX_R2T;
2490 else if (attr == &dev_attr_sess_immediate_data.attr)
2491 param = ISCSI_PARAM_IMM_DATA_EN;
2492 else if (attr == &dev_attr_sess_first_burst_len.attr)
2493 param = ISCSI_PARAM_FIRST_BURST;
2494 else if (attr == &dev_attr_sess_max_burst_len.attr)
2495 param = ISCSI_PARAM_MAX_BURST;
2496 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2497 param = ISCSI_PARAM_PDU_INORDER_EN;
2498 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2499 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2500 else if (attr == &dev_attr_sess_erl.attr)
2501 param = ISCSI_PARAM_ERL;
2502 else if (attr == &dev_attr_sess_targetname.attr)
2503 param = ISCSI_PARAM_TARGET_NAME;
2504 else if (attr == &dev_attr_sess_tpgt.attr)
2505 param = ISCSI_PARAM_TPGT;
2506 else if (attr == &dev_attr_sess_password.attr)
2507 param = ISCSI_PARAM_USERNAME;
2508 else if (attr == &dev_attr_sess_password_in.attr)
2509 param = ISCSI_PARAM_USERNAME_IN;
2510 else if (attr == &dev_attr_sess_username.attr)
2511 param = ISCSI_PARAM_PASSWORD;
2512 else if (attr == &dev_attr_sess_username_in.attr)
2513 param = ISCSI_PARAM_PASSWORD_IN;
2514 else if (attr == &dev_attr_sess_fast_abort.attr)
2515 param = ISCSI_PARAM_FAST_ABORT;
2516 else if (attr == &dev_attr_sess_abort_tmo.attr)
2517 param = ISCSI_PARAM_ABORT_TMO;
2518 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2519 param = ISCSI_PARAM_LU_RESET_TMO;
2520 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2521 param = ISCSI_PARAM_TGT_RESET_TMO;
2522 else if (attr == &dev_attr_sess_ifacename.attr)
2523 param = ISCSI_PARAM_IFACE_NAME;
2524 else if (attr == &dev_attr_sess_initiatorname.attr)
2525 param = ISCSI_PARAM_INITIATOR_NAME;
2526 else if (attr == &dev_attr_sess_targetalias.attr)
2527 param = ISCSI_PARAM_TARGET_ALIAS;
2528 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2529 return S_IRUGO | S_IWUSR;
2530 else if (attr == &dev_attr_priv_sess_state.attr)
2531 return S_IRUGO;
0c70d84b
MC		 2532 else if (attr == &dev_attr_priv_sess_creator.attr)
2533 return S_IRUGO;
1d063c17
MC		 2534 else {
2535 WARN_ONCE(1, "Invalid session attr");
2536 return 0;
2537 }
2538
2539 return t->attr_is_visible(ISCSI_PARAM, param);
2540}
2541
2542static struct attribute_group iscsi_session_group = {
2543 .attrs = iscsi_session_attrs,
2544 .is_visible = iscsi_session_attr_is_visible,
2545};
2546
1819dc81
MC		 2547/*
2548 * iSCSI host attrs
2549 */
2550#define iscsi_host_attr_show(param) \
2551static ssize_t \
ee959b00
TJ		 2552show_host_param_##param(struct device *dev, \
2553 struct device_attribute *attr, char *buf) \
1819dc81 2554{ \
ee959b00 2555 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2556 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2557 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2558}
2559
2560#define iscsi_host_attr(field, param) \
2561 iscsi_host_attr_show(param) \
2562static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2563 NULL);
2564
d8196ed2 2565iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2566iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2567iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2568iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
aeddde29
VC		 2569iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
2570iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
1819dc81 2571
f27fb2ef
MC		 2572static struct attribute *iscsi_host_attrs[] = {
2573 &dev_attr_host_netdev.attr,
2574 &dev_attr_host_hwaddress.attr,
2575 &dev_attr_host_ipaddress.attr,
2576 &dev_attr_host_initiatorname.attr,
aeddde29
VC		 2577 &dev_attr_host_port_state.attr,
2578 &dev_attr_host_port_speed.attr,
f27fb2ef
MC		 2579 NULL,
2580};
2581
587a1f16 2582static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
f27fb2ef
MC		 2583 struct attribute *attr, int i)
2584{
2585 struct device *cdev = container_of(kobj, struct device, kobj);
2586 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2587 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2588 int param;
2589
2590 if (attr == &dev_attr_host_netdev.attr)
2591 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2592 else if (attr == &dev_attr_host_hwaddress.attr)
2593 param = ISCSI_HOST_PARAM_HWADDRESS;
2594 else if (attr == &dev_attr_host_ipaddress.attr)
2595 param = ISCSI_HOST_PARAM_IPADDRESS;
2596 else if (attr == &dev_attr_host_initiatorname.attr)
2597 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
aeddde29
VC		 2598 else if (attr == &dev_attr_host_port_state.attr)
2599 param = ISCSI_HOST_PARAM_PORT_STATE;
2600 else if (attr == &dev_attr_host_port_speed.attr)
2601 param = ISCSI_HOST_PARAM_PORT_SPEED;
f27fb2ef
MC		 2602 else {
2603 WARN_ONCE(1, "Invalid host attr");
2604 return 0;
2605 }
2606
2607 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2608}
2609
2610static struct attribute_group iscsi_host_group = {
2611 .attrs = iscsi_host_attrs,
2612 .is_visible = iscsi_host_attr_is_visible,
2613};
1819dc81 2614
aeddde29
VC		 2615/* convert iscsi_port_speed values to ascii string name */
2616static const struct {
2617 enum iscsi_port_speed value;
2618 char *name;
2619} iscsi_port_speed_names[] = {
2620 {ISCSI_PORT_SPEED_UNKNOWN, "Unknown" },
2621 {ISCSI_PORT_SPEED_10MBPS, "10 Mbps" },
2622 {ISCSI_PORT_SPEED_100MBPS, "100 Mbps" },
2623 {ISCSI_PORT_SPEED_1GBPS, "1 Gbps" },
2624 {ISCSI_PORT_SPEED_10GBPS, "10 Gbps" },
2625};
2626
2627char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
2628{
2629 int i;
2630 char *speed = "Unknown!";
2631 struct iscsi_cls_host *ihost = shost->shost_data;
2632 uint32_t port_speed = ihost->port_speed;
2633
2634 for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
2635 if (iscsi_port_speed_names[i].value & port_speed) {
2636 speed = iscsi_port_speed_names[i].name;
2637 break;
2638 }
2639 }
2640 return speed;
2641}
2642EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
2643
2644/* convert iscsi_port_state values to ascii string name */
2645static const struct {
2646 enum iscsi_port_state value;
2647 char *name;
2648} iscsi_port_state_names[] = {
2649 {ISCSI_PORT_STATE_DOWN, "LINK DOWN" },
2650 {ISCSI_PORT_STATE_UP, "LINK UP" },
2651};
2652
2653char *iscsi_get_port_state_name(struct Scsi_Host *shost)
2654{
2655 int i;
2656 char *state = "Unknown!";
2657 struct iscsi_cls_host *ihost = shost->shost_data;
2658 uint32_t port_state = ihost->port_state;
2659
2660 for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
2661 if (iscsi_port_state_names[i].value & port_state) {
2662 state = iscsi_port_state_names[i].name;
2663 break;
2664 }
2665 }
2666 return state;
2667}
2668EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
2669
0896b752
AA		 2670static int iscsi_session_match(struct attribute_container *cont,
2671 struct device *dev)
1da177e4 2672{
7b8631b5 2673 struct iscsi_cls_session *session;
1da177e4 2674 struct Scsi_Host *shost;
0896b752
AA		 2675 struct iscsi_internal *priv;
2676
2677 if (!iscsi_is_session_dev(dev))
2678 return 0;
1da177e4 2679
7b8631b5
MC		 2680 session = iscsi_dev_to_session(dev);
2681 shost = iscsi_session_to_shost(session);
0896b752 2682 if (!shost->transportt)
1da177e4
LT		 2683 return 0;
2684
0896b752
AA		 2685 priv = to_iscsi_internal(shost->transportt);
2686 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2687 return 0;
2688
0896b752 2689 return &priv->session_cont.ac == cont;
1da177e4
LT		 2690}
2691
0896b752
AA		 2692static int iscsi_conn_match(struct attribute_container *cont,
2693 struct device *dev)
2694{
7b8631b5
MC		 2695 struct iscsi_cls_session *session;
2696 struct iscsi_cls_conn *conn;
1da177e4 2697 struct Scsi_Host *shost;
0896b752 2698 struct iscsi_internal *priv;
1da177e4 2699
0896b752 2700 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2701 return 0;
2702
7b8631b5
MC		 2703 conn = iscsi_dev_to_conn(dev);
2704 session = iscsi_dev_to_session(conn->dev.parent);
2705 shost = iscsi_session_to_shost(session);
2706
0896b752 2707 if (!shost->transportt)
1da177e4
LT		 2708 return 0;
2709
0896b752
AA		 2710 priv = to_iscsi_internal(shost->transportt);
2711 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2712 return 0;
1da177e4 2713
0896b752
AA		 2714 return &priv->conn_cont.ac == cont;
2715}
2716
30a6c652
MC		 2717static int iscsi_host_match(struct attribute_container *cont,
2718 struct device *dev)
2719{
2720 struct Scsi_Host *shost;
2721 struct iscsi_internal *priv;
2722
2723 if (!scsi_is_host_device(dev))
2724 return 0;
2725
2726 shost = dev_to_shost(dev);
2727 if (!shost->transportt ||
2728 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2729 return 0;
2730
2731 priv = to_iscsi_internal(shost->transportt);
2732 return &priv->t.host_attrs.ac == cont;
2733}
2734
7b8631b5
MC		 2735struct scsi_transport_template *
2736iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2737{
2738 struct iscsi_internal *priv;
2739 unsigned long flags;
f27fb2ef 2740 int err;
0896b752
AA		 2741
2742 BUG_ON(!tt);
2743
2744 priv = iscsi_if_transport_lookup(tt);
2745 if (priv)
7b8631b5 2746 return NULL;
0896b752 2747
24669f75 2748 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2749 if (!priv)
7b8631b5 2750 return NULL;
0896b752 2751 INIT_LIST_HEAD(&priv->list);
0896b752 2752 priv->iscsi_transport = tt;
30a6c652 2753 priv->t.user_scan = iscsi_user_scan;
06d25af4 2754 priv->t.create_work_queue = 1;
0896b752 2755
ee959b00 2756 priv->dev.class = &iscsi_transport_class;
71610f55 2757 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2758 err = device_register(&priv->dev);
0896b752
AA		 2759 if (err)
2760 goto free_priv;
2761
ee959b00 2762 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2763 if (err)
ee959b00 2764 goto unregister_dev;
0896b752 2765
30a6c652 2766 /* host parameters */
30a6c652
MC		 2767 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2768 priv->t.host_attrs.ac.match = iscsi_host_match;
f27fb2ef 2769 priv->t.host_attrs.ac.grp = &iscsi_host_group;
32c6e1b9 2770 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2771 transport_container_register(&priv->t.host_attrs);
2772
0896b752 2773 /* connection parameters */
0896b752
AA		 2774 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2775 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2776 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2777 transport_container_register(&priv->conn_cont);
1da177e4 2778
0896b752 2779 /* session parameters */
0896b752
AA		 2780 priv->session_cont.ac.class = &iscsi_session_class.class;
2781 priv->session_cont.ac.match = iscsi_session_match;
1d063c17 2782 priv->session_cont.ac.grp = &iscsi_session_group;
0896b752
AA		 2783 transport_container_register(&priv->session_cont);
2784
0896b752
AA		 2785 spin_lock_irqsave(&iscsi_transport_lock, flags);
2786 list_add(&priv->list, &iscsi_transports);
2787 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2788
2789 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2790 return &priv->t;
1da177e4 2791
ee959b00
TJ		 2792unregister_dev:
2793 device_unregister(&priv->dev);
d82ff9be 2794 return NULL;
0896b752
AA		 2795free_priv:
2796 kfree(priv);
7b8631b5 2797 return NULL;
1da177e4 2798}
0896b752
AA		 2799EXPORT_SYMBOL_GPL(iscsi_register_transport);
2800
2801int iscsi_unregister_transport(struct iscsi_transport *tt)
2802{
2803 struct iscsi_internal *priv;
2804 unsigned long flags;
2805
2806 BUG_ON(!tt);
2807
0b950672 2808 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2809
2810 priv = iscsi_if_transport_lookup(tt);
2811 BUG_ON (!priv);
2812
0896b752
AA		 2813 spin_lock_irqsave(&iscsi_transport_lock, flags);
2814 list_del(&priv->list);
2815 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2816
2817 transport_container_unregister(&priv->conn_cont);
2818 transport_container_unregister(&priv->session_cont);
30a6c652 2819 transport_container_unregister(&priv->t.host_attrs);
0896b752 2820
ee959b00
TJ		 2821 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2822 device_unregister(&priv->dev);
0b950672 2823 mutex_unlock(&rx_queue_mutex);
1da177e4 2824
0896b752
AA		 2825 return 0;
2826}
2827EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2828
1da177e4
LT		 2829static __init int iscsi_transport_init(void)
2830{
0896b752 2831 int err;
1da177e4 2832
09492605 2833 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2834 ISCSI_TRANSPORT_VERSION);
2835
41be1444
MC		 2836 atomic_set(&iscsi_session_nr, 0);
2837
0896b752 2838 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2839 if (err)
2840 return err;
0896b752 2841
d82ff9be 2842 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2843 if (err)
2844 goto unregister_transport_class;
2845
8d07913d 2846 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2847 if (err)
2848 goto unregister_endpoint_class;
2849
8d07913d
MC		 2850 err = transport_class_register(&iscsi_host_class);
2851 if (err)
2852 goto unregister_iface_class;
2853
30a6c652
MC		 2854 err = transport_class_register(&iscsi_connection_class);
2855 if (err)
2856 goto unregister_host_class;
2857
0896b752
AA		 2858 err = transport_class_register(&iscsi_session_class);
2859 if (err)
2860 goto unregister_conn_class;
2861
d82ff9be
MC		 2862 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2863 NULL, THIS_MODULE);
0896b752
AA		 2864 if (!nls) {
2865 err = -ENOBUFS;
43a145a3 2866 goto unregister_session_class;
0896b752
AA		 2867 }
2868
d8bf541e
MC		 2869 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2870 if (!iscsi_eh_timer_workq)
2871 goto release_nls;
2872
43a145a3 2873 return 0;
0896b752 2874
d8bf541e 2875release_nls:
b7c6ba6e 2876 netlink_kernel_release(nls);
0896b752
AA		 2877unregister_session_class:
2878 transport_class_unregister(&iscsi_session_class);
2879unregister_conn_class:
2880 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2881unregister_host_class:
2882 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2883unregister_iface_class:
2884 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2885unregister_endpoint_class:
2886 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2887unregister_transport_class:
2888 class_unregister(&iscsi_transport_class);
2889 return err;
1da177e4
LT		 2890}
2891
2892static void __exit iscsi_transport_exit(void)
2893{
d8bf541e 2894 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 2895 netlink_kernel_release(nls);
0896b752
AA		 2896 transport_class_unregister(&iscsi_connection_class);
2897 transport_class_unregister(&iscsi_session_class);
30a6c652 2898 transport_class_unregister(&iscsi_host_class);
d82ff9be 2899 class_unregister(&iscsi_endpoint_class);
8d07913d 2900 class_unregister(&iscsi_iface_class);
0896b752 2901 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2902}
2903
2904module_init(iscsi_transport_init);
2905module_exit(iscsi_transport_exit);
2906
0896b752
AA		 2907MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2908 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2909 "Alex Aizman <itn780@yahoo.com>");
2910MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2911MODULE_LICENSE("GPL");
f4246b33 2912MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 2913MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
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