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netlink: Rename pid to portid to avoid confusion
[GitHub/mt8127/android_kernel_alcatel_ttab.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) {
86072d81 578 bsg_unregister_queue(ihost->bsg_q);
90eeb01a
MC		 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
6260a5d2 730int iscsi_is_session_dev(const struct device *dev)
7b8631b5
MC		 731{
732 return dev->release == iscsi_session_release;
733}
6260a5d2 734EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
0896b752 735
a4804cd6
MC		 736static int iscsi_iter_session_fn(struct device *dev, void *data)
737{
738 void (* fn) (struct iscsi_cls_session *) = data;
739
740 if (!iscsi_is_session_dev(dev))
741 return 0;
742 fn(iscsi_dev_to_session(dev));
743 return 0;
744}
745
746void iscsi_host_for_each_session(struct Scsi_Host *shost,
747 void (*fn)(struct iscsi_cls_session *))
748{
749 device_for_each_child(&shost->shost_gendev, fn,
750 iscsi_iter_session_fn);
751}
752EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
753
8aae18ad
MC		 754/**
755 * iscsi_scan_finished - helper to report when running scans are done
756 * @shost: scsi host
757 * @time: scan run time
758 *
759 * This function can be used by drives like qla4xxx to report to the scsi
760 * layer when the scans it kicked off at module load time are done.
761 */
762int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
763{
32c6e1b9 764 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 765 /*
766 * qla4xxx will have kicked off some session unblocks before calling
767 * scsi_scan_host, so just wait for them to complete.
768 */
769 return !atomic_read(&ihost->nr_scans);
770}
771EXPORT_SYMBOL_GPL(iscsi_scan_finished);
772
7970634b
MC		 773struct iscsi_scan_data {
774 unsigned int channel;
775 unsigned int id;
776 unsigned int lun;
777};
778
779static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 780{
7970634b 781 struct iscsi_scan_data *scan_data = data;
30a6c652 782 struct iscsi_cls_session *session;
7970634b
MC		 783 struct Scsi_Host *shost;
784 struct iscsi_cls_host *ihost;
785 unsigned long flags;
786 unsigned int id;
787
788 if (!iscsi_is_session_dev(dev))
789 return 0;
790
791 session = iscsi_dev_to_session(dev);
632248aa
MC		 792
793 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
794
7970634b
MC		 795 shost = iscsi_session_to_shost(session);
796 ihost = shost->shost_data;
30a6c652
MC		 797
798 mutex_lock(&ihost->mutex);
7970634b
MC		 799 spin_lock_irqsave(&session->lock, flags);
800 if (session->state != ISCSI_SESSION_LOGGED_IN) {
801 spin_unlock_irqrestore(&session->lock, flags);
632248aa 802 goto user_scan_exit;
30a6c652 803 }
7970634b
MC		 804 id = session->target_id;
805 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 806
7970634b
MC		 807 if (id != ISCSI_MAX_TARGET) {
808 if ((scan_data->channel == SCAN_WILD_CARD ||
809 scan_data->channel == 0) &&
810 (scan_data->id == SCAN_WILD_CARD ||
811 scan_data->id == id))
812 scsi_scan_target(&session->dev, 0, id,
813 scan_data->lun, 1);
814 }
632248aa
MC		 815
816user_scan_exit:
7970634b 817 mutex_unlock(&ihost->mutex);
632248aa 818 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
30a6c652
MC		 819 return 0;
820}
821
7970634b
MC		 822static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
823 uint id, uint lun)
824{
825 struct iscsi_scan_data scan_data;
826
827 scan_data.channel = channel;
828 scan_data.id = id;
829 scan_data.lun = lun;
830
831 return device_for_each_child(&shost->shost_gendev, &scan_data,
832 iscsi_user_scan_session);
833}
834
bd976f62
MC		 835static void iscsi_scan_session(struct work_struct *work)
836{
837 struct iscsi_cls_session *session =
838 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 839 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 840 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 841 struct iscsi_scan_data scan_data;
bd976f62 842
7970634b
MC		 843 scan_data.channel = 0;
844 scan_data.id = SCAN_WILD_CARD;
845 scan_data.lun = SCAN_WILD_CARD;
bd976f62 846
7970634b 847 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 848 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 849}
850
c01be6dc
MC		 851/**
852 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
e6d4ef45 853 * @cmd: scsi cmd passed to scsi eh handler
c01be6dc
MC		 854 *
855 * If the session is down this function will wait for the recovery
856 * timer to fire or for the session to be logged back in. If the
857 * recovery timer fires then FAST_IO_FAIL is returned. The caller
858 * should pass this error value to the scsi eh.
859 */
860int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
861{
862 struct iscsi_cls_session *session =
863 starget_to_session(scsi_target(cmd->device));
864 unsigned long flags;
865 int ret = 0;
866
867 spin_lock_irqsave(&session->lock, flags);
868 while (session->state != ISCSI_SESSION_LOGGED_IN) {
869 if (session->state == ISCSI_SESSION_FREE) {
870 ret = FAST_IO_FAIL;
871 break;
872 }
873 spin_unlock_irqrestore(&session->lock, flags);
874 msleep(1000);
875 spin_lock_irqsave(&session->lock, flags);
876 }
877 spin_unlock_irqrestore(&session->lock, flags);
878 return ret;
879}
880EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
881
c4028958 882static void session_recovery_timedout(struct work_struct *work)
30a6c652 883{
c4028958
DH		 884 struct iscsi_cls_session *session =
885 container_of(work, struct iscsi_cls_session,
886 recovery_work.work);
6eabafbe 887 unsigned long flags;
30a6c652 888
322d739d
MC		 889 iscsi_cls_session_printk(KERN_INFO, session,
890 "session recovery timed out after %d secs\n",
891 session->recovery_tmo);
30a6c652 892
6eabafbe
MC		 893 spin_lock_irqsave(&session->lock, flags);
894 switch (session->state) {
895 case ISCSI_SESSION_FAILED:
896 session->state = ISCSI_SESSION_FREE;
897 break;
898 case ISCSI_SESSION_LOGGED_IN:
899 case ISCSI_SESSION_FREE:
900 /* we raced with the unblock's flush */
901 spin_unlock_irqrestore(&session->lock, flags);
902 return;
903 }
904 spin_unlock_irqrestore(&session->lock, flags);
905
30a6c652
MC		 906 if (session->transport->session_recovery_timedout)
907 session->transport->session_recovery_timedout(session);
908
632248aa 909 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
5d9fb5cc 910 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
632248aa 911 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
30a6c652
MC		 912}
913
45ab33b6 914static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 915{
45ab33b6
MC		 916 struct iscsi_cls_session *session =
917 container_of(work, struct iscsi_cls_session,
918 unblock_work);
bd976f62 919 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 920 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 921 unsigned long flags;
922
632248aa 923 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
45ab33b6
MC		 924 /*
925 * The recovery and unblock work get run from the same workqueue,
926 * so try to cancel it if it was going to run after this unblock.
927 */
928 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 929 spin_lock_irqsave(&session->lock, flags);
930 session->state = ISCSI_SESSION_LOGGED_IN;
931 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6 932 /* start IO */
5d9fb5cc 933 scsi_target_unblock(&session->dev, SDEV_RUNNING);
8aae18ad
MC		 934 /*
935 * Only do kernel scanning if the driver is properly hooked into
936 * the async scanning code (drivers like iscsi_tcp do login and
937 * scanning from userspace).
938 */
939 if (shost->hostt->scan_finished) {
06d25af4 940 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 941 atomic_inc(&ihost->nr_scans);
942 }
632248aa 943 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
6eabafbe 944}
45ab33b6
MC		 945
946/**
947 * iscsi_unblock_session - set a session as logged in and start IO.
948 * @session: iscsi session
949 *
950 * Mark a session as ready to accept IO.
951 */
952void iscsi_unblock_session(struct iscsi_cls_session *session)
953{
954 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
955 /*
956 * make sure all the events have completed before tell the driver
957 * it is safe
958 */
959 flush_workqueue(iscsi_eh_timer_workq);
960}
30a6c652
MC		 961EXPORT_SYMBOL_GPL(iscsi_unblock_session);
962
45ab33b6 963static void __iscsi_block_session(struct work_struct *work)
30a6c652 964{
45ab33b6
MC		 965 struct iscsi_cls_session *session =
966 container_of(work, struct iscsi_cls_session,
967 block_work);
6eabafbe
MC		 968 unsigned long flags;
969
632248aa 970 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
6eabafbe
MC		 971 spin_lock_irqsave(&session->lock, flags);
972 session->state = ISCSI_SESSION_FAILED;
973 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 974 scsi_target_block(&session->dev);
632248aa 975 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
fdd46dcb
MC		 976 if (session->recovery_tmo >= 0)
977 queue_delayed_work(iscsi_eh_timer_workq,
978 &session->recovery_work,
979 session->recovery_tmo * HZ);
30a6c652 980}
45ab33b6
MC		 981
982void iscsi_block_session(struct iscsi_cls_session *session)
983{
984 queue_work(iscsi_eh_timer_workq, &session->block_work);
985}
30a6c652
MC		 986EXPORT_SYMBOL_GPL(iscsi_block_session);
987
26974789
MC		 988static void __iscsi_unbind_session(struct work_struct *work)
989{
990 struct iscsi_cls_session *session =
991 container_of(work, struct iscsi_cls_session,
992 unbind_work);
993 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 994 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 995 unsigned long flags;
8d4a690c 996 unsigned int target_id;
26974789 997
632248aa
MC		 998 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
999
26974789
MC		 1000 /* Prevent new scans and make sure scanning is not in progress */
1001 mutex_lock(&ihost->mutex);
7970634b
MC		 1002 spin_lock_irqsave(&session->lock, flags);
1003 if (session->target_id == ISCSI_MAX_TARGET) {
1004 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 1005 mutex_unlock(&ihost->mutex);
1006 return;
1007 }
8d4a690c
MC		 1008
1009 target_id = session->target_id;
7970634b
MC		 1010 session->target_id = ISCSI_MAX_TARGET;
1011 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 1012 mutex_unlock(&ihost->mutex);
1013
8d4a690c
MC		 1014 if (session->ida_used)
1015 ida_simple_remove(&iscsi_sess_ida, target_id);
1016
26974789
MC		 1017 scsi_remove_target(&session->dev);
1018 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
632248aa 1019 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
26974789
MC		 1020}
1021
7b8631b5 1022struct iscsi_cls_session *
5d91e209
MC		 1023iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1024 int dd_size)
7b8631b5
MC		 1025{
1026 struct iscsi_cls_session *session;
7b8631b5 1027
5d91e209 1028 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 1029 GFP_KERNEL);
7b8631b5 1030 if (!session)
f53a88da
MC		 1031 return NULL;
1032
7b8631b5 1033 session->transport = transport;
0c70d84b 1034 session->creator = -1;
30a6c652 1035 session->recovery_tmo = 120;
6eabafbe 1036 session->state = ISCSI_SESSION_FREE;
c4028958 1037 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 1038 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 1039 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1040 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 1041 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 1042 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 1043 spin_lock_init(&session->lock);
7b8631b5 1044
6a8a0d36
MC		 1045 /* this is released in the dev's release function */
1046 scsi_host_get(shost);
8434aa8b
MC		 1047 session->dev.parent = &shost->shost_gendev;
1048 session->dev.release = iscsi_session_release;
1049 device_initialize(&session->dev);
5d91e209 1050 if (dd_size)
b5c7a12d 1051 session->dd_data = &session[1];
632248aa
MC		 1052
1053 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
8434aa8b
MC		 1054 return session;
1055}
1056EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1057
6a8a0d36 1058int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 1059{
1060 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 1061 struct iscsi_cls_host *ihost;
26974789 1062 unsigned long flags;
8d4a690c 1063 int id = 0;
8434aa8b 1064 int err;
b5c7a12d 1065
30a6c652 1066 ihost = shost->shost_data;
41be1444 1067 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b 1068
8d4a690c
MC		 1069 if (target_id == ISCSI_MAX_TARGET) {
1070 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
7970634b 1071
8d4a690c 1072 if (id < 0) {
7970634b 1073 iscsi_cls_session_printk(KERN_ERR, session,
8d4a690c
MC		 1074 "Failure in Target ID Allocation\n");
1075 return id;
7970634b 1076 }
8d4a690c
MC		 1077 session->target_id = (unsigned int)id;
1078 session->ida_used = true;
1079 } else
1080 session->target_id = target_id;
30a6c652 1081
71610f55 1082 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 1083 err = device_add(&session->dev);
7b8631b5 1084 if (err) {
322d739d
MC		 1085 iscsi_cls_session_printk(KERN_ERR, session,
1086 "could not register session's dev\n");
8d4a690c 1087 goto release_ida;
7b8631b5
MC		 1088 }
1089 transport_register_device(&session->dev);
1090
26974789
MC		 1091 spin_lock_irqsave(&sesslock, flags);
1092 list_add(&session->sess_list, &sesslist);
1093 spin_unlock_irqrestore(&sesslock, flags);
1094
26974789 1095 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
632248aa 1096 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
8434aa8b 1097 return 0;
30a6c652 1098
8d4a690c
MC		 1099release_ida:
1100 if (session->ida_used)
1101 ida_simple_remove(&iscsi_sess_ida, session->target_id);
1102
8434aa8b 1103 return err;
7b8631b5 1104}
8434aa8b 1105EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 1106
1107/**
8434aa8b
MC		 1108 * iscsi_create_session - create iscsi class session
1109 * @shost: scsi host
1110 * @transport: iscsi transport
5d91e209 1111 * @dd_size: private driver data size
eb44820c 1112 * @target_id: which target
7b8631b5 1113 *
8434aa8b 1114 * This can be called from a LLD or iscsi_transport.
eb44820c 1115 */
8434aa8b 1116struct iscsi_cls_session *
5d91e209
MC		 1117iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1118 int dd_size, unsigned int target_id)
8434aa8b
MC		 1119{
1120 struct iscsi_cls_session *session;
1121
5d91e209 1122 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 1123 if (!session)
1124 return NULL;
1125
6a8a0d36 1126 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 1127 iscsi_free_session(session);
1128 return NULL;
1129 }
1130 return session;
1131}
1132EXPORT_SYMBOL_GPL(iscsi_create_session);
1133
26974789
MC		 1134static void iscsi_conn_release(struct device *dev)
1135{
1136 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1137 struct device *parent = conn->dev.parent;
1138
632248aa 1139 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
26974789
MC		 1140 kfree(conn);
1141 put_device(parent);
1142}
1143
1144static int iscsi_is_conn_dev(const struct device *dev)
1145{
1146 return dev->release == iscsi_conn_release;
1147}
1148
1149static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1150{
1151 if (!iscsi_is_conn_dev(dev))
1152 return 0;
1153 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1154}
1155
8434aa8b 1156void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 1157{
30a6c652 1158 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 1159 unsigned long flags;
1160 int err;
1161
632248aa
MC		 1162 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1163
26974789
MC		 1164 spin_lock_irqsave(&sesslock, flags);
1165 list_del(&session->sess_list);
1166 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 1167
45ab33b6
MC		 1168 /* make sure there are no blocks/unblocks queued */
1169 flush_workqueue(iscsi_eh_timer_workq);
1170 /* make sure the timedout callout is not running */
1171 if (!cancel_delayed_work(&session->recovery_work))
1172 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 1173 /*
1174 * If we are blocked let commands flow again. The lld or iscsi
1175 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 1176 * We assume that LLD will not be calling block/unblock while
1177 * removing the session.
26974789 1178 */
6eabafbe
MC		 1179 spin_lock_irqsave(&session->lock, flags);
1180 session->state = ISCSI_SESSION_FREE;
1181 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 1182
5d9fb5cc 1183 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
45ab33b6 1184 /* flush running scans then delete devices */
06d25af4 1185 scsi_flush_work(shost);
45ab33b6 1186 __iscsi_unbind_session(&session->unbind_work);
30a6c652 1187
26974789
MC		 1188 /* hw iscsi may not have removed all connections from session */
1189 err = device_for_each_child(&session->dev, NULL,
1190 iscsi_iter_destroy_conn_fn);
1191 if (err)
322d739d
MC		 1192 iscsi_cls_session_printk(KERN_ERR, session,
1193 "Could not delete all connections "
1194 "for session. Error %d.\n", err);
8434aa8b 1195
7b8631b5 1196 transport_unregister_device(&session->dev);
632248aa
MC		 1197
1198 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
8434aa8b
MC		 1199 device_del(&session->dev);
1200}
1201EXPORT_SYMBOL_GPL(iscsi_remove_session);
1202
1203void iscsi_free_session(struct iscsi_cls_session *session)
1204{
632248aa 1205 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
26974789 1206 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 1207 put_device(&session->dev);
7b8631b5 1208}
8434aa8b
MC		 1209EXPORT_SYMBOL_GPL(iscsi_free_session);
1210
1211/**
1212 * iscsi_destroy_session - destroy iscsi session
1213 * @session: iscsi_session
1214 *
1215 * Can be called by a LLD or iscsi_transport. There must not be
1216 * any running connections.
eb44820c 1217 */
8434aa8b
MC		 1218int iscsi_destroy_session(struct iscsi_cls_session *session)
1219{
1220 iscsi_remove_session(session);
632248aa 1221 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
8434aa8b
MC		 1222 iscsi_free_session(session);
1223 return 0;
1224}
7b8631b5
MC		 1225EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1226
7b8631b5
MC		 1227/**
1228 * iscsi_create_conn - create iscsi class connection
1229 * @session: iscsi cls session
5d91e209 1230 * @dd_size: private driver data size
7b8631b5
MC		 1231 * @cid: connection id
1232 *
1233 * This can be called from a LLD or iscsi_transport. The connection
1234 * is child of the session so cid must be unique for all connections
1235 * on the session.
b5c7a12d
MC		 1236 *
1237 * Since we do not support MCS, cid will normally be zero. In some cases
1238 * for software iscsi we could be trying to preallocate a connection struct
1239 * in which case there could be two connection structs and cid would be
1240 * non-zero.
eb44820c 1241 */
7b8631b5 1242struct iscsi_cls_conn *
5d91e209 1243iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 1244{
1245 struct iscsi_transport *transport = session->transport;
7b8631b5 1246 struct iscsi_cls_conn *conn;
26974789 1247 unsigned long flags;
7b8631b5
MC		 1248 int err;
1249
5d91e209 1250 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 1251 if (!conn)
1252 return NULL;
5d91e209 1253 if (dd_size)
7b8631b5
MC		 1254 conn->dd_data = &conn[1];
1255
22a39fbb 1256 mutex_init(&conn->ep_mutex);
7b8631b5
MC		 1257 INIT_LIST_HEAD(&conn->conn_list);
1258 conn->transport = transport;
b5c7a12d 1259 conn->cid = cid;
7b8631b5
MC		 1260
1261 /* this is released in the dev's release function */
1262 if (!get_device(&session->dev))
43a145a3 1263 goto free_conn;
b5c7a12d 1264
71610f55 1265 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 1266 conn->dev.parent = &session->dev;
1267 conn->dev.release = iscsi_conn_release;
1268 err = device_register(&conn->dev);
1269 if (err) {
322d739d
MC		 1270 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1271 "register connection's dev\n");
7b8631b5
MC		 1272 goto release_parent_ref;
1273 }
1274 transport_register_device(&conn->dev);
26974789
MC		 1275
1276 spin_lock_irqsave(&connlock, flags);
1277 list_add(&conn->conn_list, &connlist);
26974789 1278 spin_unlock_irqrestore(&connlock, flags);
632248aa
MC		 1279
1280 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
7b8631b5
MC		 1281 return conn;
1282
1283release_parent_ref:
1284 put_device(&session->dev);
1285free_conn:
1286 kfree(conn);
1287 return NULL;
1288}
1289
1290EXPORT_SYMBOL_GPL(iscsi_create_conn);
1291
1292/**
1293 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 1294 * @conn: iscsi cls session
7b8631b5 1295 *
26974789 1296 * This can be called from a LLD or iscsi_transport.
eb44820c 1297 */
7b8631b5
MC		 1298int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1299{
26974789
MC		 1300 unsigned long flags;
1301
1302 spin_lock_irqsave(&connlock, flags);
26974789
MC		 1303 list_del(&conn->conn_list);
1304 spin_unlock_irqrestore(&connlock, flags);
1305
7b8631b5 1306 transport_unregister_device(&conn->dev);
632248aa 1307 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
7b8631b5
MC		 1308 device_unregister(&conn->dev);
1309 return 0;
1310}
7b8631b5
MC		 1311EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1312
7b8631b5
MC		 1313/*
1314 * iscsi interface functions
1315 */
0896b752
AA		 1316static struct iscsi_internal *
1317iscsi_if_transport_lookup(struct iscsi_transport *tt)
1318{
1319 struct iscsi_internal *priv;
1320 unsigned long flags;
1321
1322 spin_lock_irqsave(&iscsi_transport_lock, flags);
1323 list_for_each_entry(priv, &iscsi_transports, list) {
1324 if (tt == priv->iscsi_transport) {
1325 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1326 return priv;
1327 }
1328 }
1329 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1330 return NULL;
1331}
1da177e4 1332
53cb8a1f 1333static int
43514774 1334iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
53cb8a1f 1335{
43514774 1336 return nlmsg_multicast(nls, skb, 0, group, gfp);
1da177e4 1337}
1da177e4 1338
7b7232f3 1339int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 1340 char *data, uint32_t data_size)
1da177e4 1341{
0896b752
AA		 1342 struct nlmsghdr *nlh;
1343 struct sk_buff *skb;
1344 struct iscsi_uevent *ev;
0896b752 1345 char *pdu;
790f39a2 1346 struct iscsi_internal *priv;
0896b752
AA		 1347 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1348 data_size);
1349
790f39a2
MC		 1350 priv = iscsi_if_transport_lookup(conn->transport);
1351 if (!priv)
1352 return -EINVAL;
1353
43a145a3 1354 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1355 if (!skb) {
e5bd7b54 1356 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 1357 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1358 "control PDU: OOM\n");
0896b752
AA		 1359 return -ENOMEM;
1360 }
1da177e4 1361
43514774 1362 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1363 ev = NLMSG_DATA(nlh);
1364 memset(ev, 0, sizeof(*ev));
1365 ev->transport_handle = iscsi_handle(conn->transport);
1366 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 1367 ev->r.recv_req.cid = conn->cid;
1368 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 1369 pdu = (char*)ev + sizeof(*ev);
1370 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1371 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 1372
43514774 1373 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1374}
0896b752 1375EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 1376
43514774
MC		 1377int iscsi_offload_mesg(struct Scsi_Host *shost,
1378 struct iscsi_transport *transport, uint32_t type,
1379 char *data, uint16_t data_size)
1380{
1381 struct nlmsghdr *nlh;
1382 struct sk_buff *skb;
1383 struct iscsi_uevent *ev;
1384 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1385
a541f840 1386 skb = alloc_skb(len, GFP_ATOMIC);
43514774
MC		 1387 if (!skb) {
1388 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1389 return -ENOMEM;
1390 }
1391
1392 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1393 ev = NLMSG_DATA(nlh);
1394 memset(ev, 0, sizeof(*ev));
1395 ev->type = type;
1396 ev->transport_handle = iscsi_handle(transport);
1397 switch (type) {
1398 case ISCSI_KEVENT_PATH_REQ:
1399 ev->r.req_path.host_no = shost->host_no;
1400 break;
1401 case ISCSI_KEVENT_IF_DOWN:
1402 ev->r.notify_if_down.host_no = shost->host_no;
1403 break;
1404 }
1405
1406 memcpy((char *)ev + sizeof(*ev), data, data_size);
1407
a541f840 1408 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
43514774
MC		 1409}
1410EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1411
e5bd7b54 1412void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 1413{
0896b752
AA		 1414 struct nlmsghdr *nlh;
1415 struct sk_buff *skb;
1416 struct iscsi_uevent *ev;
790f39a2 1417 struct iscsi_internal *priv;
0896b752
AA		 1418 int len = NLMSG_SPACE(sizeof(*ev));
1419
790f39a2
MC		 1420 priv = iscsi_if_transport_lookup(conn->transport);
1421 if (!priv)
1422 return;
1423
43a145a3 1424 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1425 if (!skb) {
322d739d
MC		 1426 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1427 "conn error (%d)\n", error);
0896b752
AA		 1428 return;
1429 }
1430
43514774 1431 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1432 ev = NLMSG_DATA(nlh);
1433 ev->transport_handle = iscsi_handle(conn->transport);
1434 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1435 ev->r.connerror.error = error;
b5c7a12d
MC		 1436 ev->r.connerror.cid = conn->cid;
1437 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1438
43514774 1439 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1da177e4 1440
322d739d
MC		 1441 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1442 error);
0896b752 1443}
e5bd7b54 1444EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752 1445
17fa575e
MR		 1446void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1447 enum iscsi_conn_state state)
1448{
1449 struct nlmsghdr *nlh;
1450 struct sk_buff *skb;
1451 struct iscsi_uevent *ev;
1452 struct iscsi_internal *priv;
1453 int len = NLMSG_SPACE(sizeof(*ev));
1454
1455 priv = iscsi_if_transport_lookup(conn->transport);
1456 if (!priv)
1457 return;
1458
1459 skb = alloc_skb(len, GFP_ATOMIC);
1460 if (!skb) {
1461 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1462 "conn login (%d)\n", state);
1463 return;
1464 }
1465
1466 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1467 ev = NLMSG_DATA(nlh);
1468 ev->transport_handle = iscsi_handle(conn->transport);
1469 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1470 ev->r.conn_login.state = state;
1471 ev->r.conn_login.cid = conn->cid;
1472 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1473 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1474
1475 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1476 state);
1477}
1478EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1479
a11e2545
VC		 1480void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
1481 enum iscsi_host_event_code code, uint32_t data_size,
1482 uint8_t *data)
1483{
1484 struct nlmsghdr *nlh;
1485 struct sk_buff *skb;
1486 struct iscsi_uevent *ev;
1487 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1488
49d0e64b 1489 skb = alloc_skb(len, GFP_NOIO);
a11e2545
VC		 1490 if (!skb) {
1491 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
1492 host_no, code);
1493 return;
1494 }
1495
1496 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1497 ev = NLMSG_DATA(nlh);
1498 ev->transport_handle = iscsi_handle(transport);
1499 ev->type = ISCSI_KEVENT_HOST_EVENT;
1500 ev->r.host_event.host_no = host_no;
1501 ev->r.host_event.code = code;
1502 ev->r.host_event.data_size = data_size;
1503
1504 if (data_size)
1505 memcpy((char *)ev + sizeof(*ev), data, data_size);
1506
49d0e64b 1507 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
a11e2545
VC		 1508}
1509EXPORT_SYMBOL_GPL(iscsi_post_host_event);
1510
ac20c7bf
VC		 1511void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
1512 uint32_t status, uint32_t pid, uint32_t data_size,
1513 uint8_t *data)
1514{
1515 struct nlmsghdr *nlh;
1516 struct sk_buff *skb;
1517 struct iscsi_uevent *ev;
1518 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1519
49d0e64b 1520 skb = alloc_skb(len, GFP_NOIO);
ac20c7bf
VC		 1521 if (!skb) {
1522 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
1523 return;
1524 }
1525
1526 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1527 ev = NLMSG_DATA(nlh);
1528 ev->transport_handle = iscsi_handle(transport);
1529 ev->type = ISCSI_KEVENT_PING_COMP;
1530 ev->r.ping_comp.host_no = host_no;
1531 ev->r.ping_comp.status = status;
1532 ev->r.ping_comp.pid = pid;
1533 ev->r.ping_comp.data_size = data_size;
1534 memcpy((char *)ev + sizeof(*ev), data, data_size);
1535
49d0e64b 1536 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
ac20c7bf
VC		 1537}
1538EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
1539
0896b752 1540static int
43514774
MC		 1541iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1542 void *payload, int size)
0896b752
AA		 1543{
1544 struct sk_buff *skb;
1545 struct nlmsghdr *nlh;
1546 int len = NLMSG_SPACE(size);
1547 int flags = multi ? NLM_F_MULTI : 0;
1548 int t = done ? NLMSG_DONE : type;
1549
43a145a3 1550 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1551 if (!skb) {
1552 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1553 return -ENOMEM;
1554 }
0896b752 1555
43514774 1556 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
0896b752
AA		 1557 nlh->nlmsg_flags = flags;
1558 memcpy(NLMSG_DATA(nlh), payload, size);
43514774 1559 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1da177e4 1560}
1da177e4 1561
7b8631b5 1562static int
5b940adf 1563iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1564{
1565 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1566 struct iscsi_stats *stats;
1567 struct sk_buff *skbstat;
1568 struct iscsi_cls_conn *conn;
1569 struct nlmsghdr *nlhstat;
1570 struct iscsi_uevent *evstat;
790f39a2 1571 struct iscsi_internal *priv;
7b8631b5
MC		 1572 int len = NLMSG_SPACE(sizeof(*ev) +
1573 sizeof(struct iscsi_stats) +
1574 sizeof(struct iscsi_stats_custom) *
1575 ISCSI_STATS_CUSTOM_MAX);
1576 int err = 0;
0896b752 1577
790f39a2
MC		 1578 priv = iscsi_if_transport_lookup(transport);
1579 if (!priv)
1580 return -EINVAL;
1581
b5c7a12d 1582 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1583 if (!conn)
1584 return -EEXIST;
0896b752 1585
7b8631b5
MC		 1586 do {
1587 int actual_size;
0896b752 1588
43a145a3 1589 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1590 if (!skbstat) {
322d739d
MC		 1591 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1592 "deliver stats: OOM\n");
7b8631b5
MC		 1593 return -ENOMEM;
1594 }
1595
43514774 1596 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
7b8631b5
MC		 1597 (len - sizeof(*nlhstat)), 0);
1598 evstat = NLMSG_DATA(nlhstat);
1599 memset(evstat, 0, sizeof(*evstat));
1600 evstat->transport_handle = iscsi_handle(conn->transport);
1601 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1602 evstat->u.get_stats.cid =
1603 ev->u.get_stats.cid;
1604 evstat->u.get_stats.sid =
1605 ev->u.get_stats.sid;
7b8631b5
MC		 1606 stats = (struct iscsi_stats *)
1607 ((char*)evstat + sizeof(*evstat));
1608 memset(stats, 0, sizeof(*stats));
1609
7b7232f3 1610 transport->get_stats(conn, stats);
7b8631b5
MC		 1611 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1612 sizeof(struct iscsi_stats) +
1613 sizeof(struct iscsi_stats_custom) *
1614 stats->custom_length);
1615 actual_size -= sizeof(*nlhstat);
1616 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1617 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1618 nlhstat->nlmsg_len = actual_size;
1619
43514774
MC		 1620 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1621 GFP_ATOMIC);
7b8631b5
MC		 1622 } while (err < 0 && err != -ECONNREFUSED);
1623
1624 return err;
0896b752
AA		 1625}
1626
53cb8a1f 1627/**
26974789
MC		 1628 * iscsi_session_event - send session destr. completion event
1629 * @session: iscsi class session
1630 * @event: type of event
eb44820c 1631 */
26974789
MC		 1632int iscsi_session_event(struct iscsi_cls_session *session,
1633 enum iscsi_uevent_e event)
53cb8a1f
MC		 1634{
1635 struct iscsi_internal *priv;
53cb8a1f
MC		 1636 struct Scsi_Host *shost;
1637 struct iscsi_uevent *ev;
1638 struct sk_buff *skb;
1639 struct nlmsghdr *nlh;
53cb8a1f
MC		 1640 int rc, len = NLMSG_SPACE(sizeof(*ev));
1641
26974789 1642 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1643 if (!priv)
1644 return -EINVAL;
53cb8a1f
MC		 1645 shost = iscsi_session_to_shost(session);
1646
43a145a3 1647 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1648 if (!skb) {
322d739d
MC		 1649 iscsi_cls_session_printk(KERN_ERR, session,
1650 "Cannot notify userspace of session "
1651 "event %u\n", event);
53cb8a1f
MC		 1652 return -ENOMEM;
1653 }
1654
43514774 1655 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
53cb8a1f 1656 ev = NLMSG_DATA(nlh);
26974789 1657 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1658
26974789
MC		 1659 ev->type = event;
1660 switch (event) {
1661 case ISCSI_KEVENT_DESTROY_SESSION:
1662 ev->r.d_session.host_no = shost->host_no;
1663 ev->r.d_session.sid = session->sid;
1664 break;
1665 case ISCSI_KEVENT_CREATE_SESSION:
1666 ev->r.c_session_ret.host_no = shost->host_no;
1667 ev->r.c_session_ret.sid = session->sid;
1668 break;
1669 case ISCSI_KEVENT_UNBIND_SESSION:
1670 ev->r.unbind_session.host_no = shost->host_no;
1671 ev->r.unbind_session.sid = session->sid;
1672 break;
1673 default:
322d739d
MC		 1674 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1675 "%u.\n", event);
26974789 1676 kfree_skb(skb);
53cb8a1f 1677 return -EINVAL;
53cb8a1f
MC		 1678 }
1679
53cb8a1f
MC		 1680 /*
1681 * this will occur if the daemon is not up, so we just warn
1682 * the user and when the daemon is restarted it will handle it
1683 */
43514774 1684 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
ff491a73 1685 if (rc == -ESRCH)
322d739d
MC		 1686 iscsi_cls_session_printk(KERN_ERR, session,
1687 "Cannot notify userspace of session "
1688 "event %u. Check iscsi daemon\n",
1689 event);
632248aa
MC		 1690
1691 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1692 event, rc);
53cb8a1f
MC		 1693 return rc;
1694}
26974789 1695EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1696
0896b752 1697static int
d82ff9be 1698iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
0c70d84b
MC		 1699 struct iscsi_uevent *ev, pid_t pid,
1700 uint32_t initial_cmdsn, uint16_t cmds_max,
1701 uint16_t queue_depth)
0896b752
AA		 1702{
1703 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1704 struct iscsi_cls_session *session;
5e7facb7 1705 struct Scsi_Host *shost;
0896b752 1706
d82ff9be 1707 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1708 initial_cmdsn);
7b7232f3 1709 if (!session)
7b8631b5 1710 return -ENOMEM;
0896b752 1711
0c70d84b 1712 session->creator = pid;
5e7facb7
MC		 1713 shost = iscsi_session_to_shost(session);
1714 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1715 ev->r.c_session_ret.sid = session->sid;
632248aa
MC		 1716 ISCSI_DBG_TRANS_SESSION(session,
1717 "Completed creating transport session\n");
0896b752 1718 return 0;
0896b752
AA		 1719}
1720
1721static int
7b7232f3 1722iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1723{
7b8631b5 1724 struct iscsi_cls_conn *conn;
7b7232f3 1725 struct iscsi_cls_session *session;
7b8631b5 1726
b5c7a12d
MC		 1727 session = iscsi_session_lookup(ev->u.c_conn.sid);
1728 if (!session) {
322d739d 1729 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1730 ev->u.c_conn.sid);
7b8631b5 1731 return -EINVAL;
b5c7a12d 1732 }
0896b752 1733
7b7232f3 1734 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1735 if (!conn) {
322d739d
MC		 1736 iscsi_cls_session_printk(KERN_ERR, session,
1737 "couldn't create a new connection.");
7b7232f3 1738 return -ENOMEM;
b5c7a12d 1739 }
0896b752 1740
b5c7a12d
MC		 1741 ev->r.c_conn_ret.sid = session->sid;
1742 ev->r.c_conn_ret.cid = conn->cid;
632248aa
MC		 1743
1744 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
0896b752 1745 return 0;
1da177e4
LT		 1746}
1747
0896b752
AA		 1748static int
1749iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1750{
7b8631b5 1751 struct iscsi_cls_conn *conn;
0896b752 1752
b5c7a12d 1753 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1754 if (!conn)
7b8631b5 1755 return -EINVAL;
0896b752 1756
632248aa 1757 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
7b8631b5
MC		 1758 if (transport->destroy_conn)
1759 transport->destroy_conn(conn);
632248aa 1760
7b8631b5 1761 return 0;
0896b752
AA		 1762}
1763
fd7255f5
MC		 1764static int
1765iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1766{
1767 char *data = (char*)ev + sizeof(*ev);
1768 struct iscsi_cls_conn *conn;
1769 struct iscsi_cls_session *session;
a54a52ca 1770 int err = 0, value = 0;
fd7255f5
MC		 1771
1772 session = iscsi_session_lookup(ev->u.set_param.sid);
1773 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1774 if (!conn || !session)
1775 return -EINVAL;
1776
1777 switch (ev->u.set_param.param) {
30a6c652 1778 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1779 sscanf(data, "%d", &value);
fdd46dcb 1780 session->recovery_tmo = value;
30a6c652 1781 break;
fd7255f5 1782 default:
a54a52ca
MC		 1783 err = transport->set_param(conn, ev->u.set_param.param,
1784 data, ev->u.set_param.len);
fd7255f5
MC		 1785 }
1786
1787 return err;
1788}
1789
10eb0f01
MC		 1790static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1791 struct iscsi_uevent *ev, int msg_type)
1792{
1793 struct iscsi_endpoint *ep;
1794 struct sockaddr *dst_addr;
1795 struct Scsi_Host *shost = NULL;
1796 int non_blocking, err = 0;
1797
1798 if (!transport->ep_connect)
1799 return -EINVAL;
1800
1801 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1802 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1803 if (!shost) {
1804 printk(KERN_ERR "ep connect failed. Could not find "
1805 "host no %u\n",
1806 ev->u.ep_connect_through_host.host_no);
1807 return -ENODEV;
1808 }
1809 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1810 } else
1811 non_blocking = ev->u.ep_connect.non_blocking;
1812
1813 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1814 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1815 if (IS_ERR(ep)) {
1816 err = PTR_ERR(ep);
1817 goto release_host;
1818 }
1819
1820 ev->r.ep_connect_ret.handle = ep->id;
1821release_host:
1822 if (shost)
1823 scsi_host_put(shost);
1824 return err;
1825}
1826
22a39fbb
MC		 1827static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1828 u64 ep_handle)
1829{
1830 struct iscsi_cls_conn *conn;
1831 struct iscsi_endpoint *ep;
1832
1833 if (!transport->ep_disconnect)
1834 return -EINVAL;
1835
1836 ep = iscsi_lookup_endpoint(ep_handle);
1837 if (!ep)
1838 return -EINVAL;
1839 conn = ep->conn;
1840 if (conn) {
1841 mutex_lock(&conn->ep_mutex);
1842 conn->ep = NULL;
1843 mutex_unlock(&conn->ep_mutex);
1844 }
1845
1846 transport->ep_disconnect(ep);
1847 return 0;
1848}
1849
264faaaa
OG		 1850static int
1851iscsi_if_transport_ep(struct iscsi_transport *transport,
1852 struct iscsi_uevent *ev, int msg_type)
1853{
d82ff9be 1854 struct iscsi_endpoint *ep;
264faaaa
OG		 1855 int rc = 0;
1856
1857 switch (msg_type) {
10eb0f01 1858 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1859 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1860 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1861 break;
1862 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1863 if (!transport->ep_poll)
1864 return -EINVAL;
1865
d82ff9be
MC		 1866 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1867 if (!ep)
1868 return -EINVAL;
1869
1870 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1871 ev->u.ep_poll.timeout_ms);
1872 break;
1873 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
22a39fbb
MC		 1874 rc = iscsi_if_ep_disconnect(transport,
1875 ev->u.ep_disconnect.ep_handle);
264faaaa
OG		 1876 break;
1877 }
1878 return rc;
1879}
1880
01cb225d
MC		 1881static int
1882iscsi_tgt_dscvr(struct iscsi_transport *transport,
1883 struct iscsi_uevent *ev)
1884{
2174a04e 1885 struct Scsi_Host *shost;
01cb225d 1886 struct sockaddr *dst_addr;
2174a04e 1887 int err;
01cb225d
MC		 1888
1889 if (!transport->tgt_dscvr)
1890 return -EINVAL;
1891
2174a04e 1892 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1893 if (!shost) {
2174a04e
MC		 1894 printk(KERN_ERR "target discovery could not find host no %u\n",
1895 ev->u.tgt_dscvr.host_no);
1896 return -ENODEV;
1897 }
1898
1899
01cb225d 1900 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1901 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1902 ev->u.tgt_dscvr.enable, dst_addr);
1903 scsi_host_put(shost);
1904 return err;
01cb225d
MC		 1905}
1906
1d9bf13a
MC		 1907static int
1908iscsi_set_host_param(struct iscsi_transport *transport,
1909 struct iscsi_uevent *ev)
1910{
1911 char *data = (char*)ev + sizeof(*ev);
1912 struct Scsi_Host *shost;
1913 int err;
1914
1915 if (!transport->set_host_param)
1916 return -ENOSYS;
1917
1918 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1919 if (!shost) {
1d9bf13a
MC		 1920 printk(KERN_ERR "set_host_param could not find host no %u\n",
1921 ev->u.set_host_param.host_no);
1922 return -ENODEV;
1923 }
1924
1925 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1926 data, ev->u.set_host_param.len);
1927 scsi_host_put(shost);
1928 return err;
1929}
1930
0896b752 1931static int
43514774
MC		 1932iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1933{
1934 struct Scsi_Host *shost;
1935 struct iscsi_path *params;
1936 int err;
1937
1938 if (!transport->set_path)
1939 return -ENOSYS;
1940
1941 shost = scsi_host_lookup(ev->u.set_path.host_no);
1942 if (!shost) {
1943 printk(KERN_ERR "set path could not find host no %u\n",
1944 ev->u.set_path.host_no);
1945 return -ENODEV;
1946 }
1947
1948 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1949 err = transport->set_path(shost, params);
1950
1951 scsi_host_put(shost);
1952 return err;
1953}
1954
56c155b5
MC		 1955static int
1956iscsi_set_iface_params(struct iscsi_transport *transport,
00c31889 1957 struct iscsi_uevent *ev, uint32_t len)
56c155b5
MC		 1958{
1959 char *data = (char *)ev + sizeof(*ev);
1960 struct Scsi_Host *shost;
1961 int err;
1962
1963 if (!transport->set_iface_param)
1964 return -ENOSYS;
1965
1966 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1967 if (!shost) {
1968 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1969 ev->u.set_iface_params.host_no);
1970 return -ENODEV;
1971 }
1972
00c31889 1973 err = transport->set_iface_param(shost, data, len);
56c155b5
MC		 1974 scsi_host_put(shost);
1975 return err;
1976}
1977
ac20c7bf
VC		 1978static int
1979iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1980{
1981 struct Scsi_Host *shost;
1982 struct sockaddr *dst_addr;
1983 int err;
1984
1985 if (!transport->send_ping)
1986 return -ENOSYS;
1987
1988 shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
1989 if (!shost) {
1990 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
1991 ev->u.iscsi_ping.host_no);
1992 return -ENODEV;
1993 }
1994
1995 dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
1996 err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
1997 ev->u.iscsi_ping.iface_type,
1998 ev->u.iscsi_ping.payload_size,
1999 ev->u.iscsi_ping.pid,
2000 dst_addr);
2001 scsi_host_put(shost);
2002 return err;
2003}
2004
6260a5d2
NJ		 2005static int
2006iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2007{
2008 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
2009 struct Scsi_Host *shost = NULL;
2010 struct iscsi_chap_rec *chap_rec;
2011 struct iscsi_internal *priv;
2012 struct sk_buff *skbchap;
2013 struct nlmsghdr *nlhchap;
2014 struct iscsi_uevent *evchap;
2015 uint32_t chap_buf_size;
2016 int len, err = 0;
2017 char *buf;
2018
2019 if (!transport->get_chap)
2020 return -EINVAL;
2021
2022 priv = iscsi_if_transport_lookup(transport);
2023 if (!priv)
2024 return -EINVAL;
2025
2026 chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
2027 len = NLMSG_SPACE(sizeof(*ev) + chap_buf_size);
2028
2029 shost = scsi_host_lookup(ev->u.get_chap.host_no);
2030 if (!shost) {
2031 printk(KERN_ERR "%s: failed. Cound not find host no %u\n",
2032 __func__, ev->u.get_chap.host_no);
2033 return -ENODEV;
2034 }
2035
2036 do {
2037 int actual_size;
2038
2039 skbchap = alloc_skb(len, GFP_KERNEL);
2040 if (!skbchap) {
2041 printk(KERN_ERR "can not deliver chap: OOM\n");
2042 err = -ENOMEM;
2043 goto exit_get_chap;
2044 }
2045
2046 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
2047 (len - sizeof(*nlhchap)), 0);
2048 evchap = NLMSG_DATA(nlhchap);
2049 memset(evchap, 0, sizeof(*evchap));
2050 evchap->transport_handle = iscsi_handle(transport);
2051 evchap->type = nlh->nlmsg_type;
2052 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
2053 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
2054 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
2055 buf = (char *) ((char *)evchap + sizeof(*evchap));
2056 memset(buf, 0, chap_buf_size);
2057
2058 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
2059 &evchap->u.get_chap.num_entries, buf);
2060
2061 actual_size = NLMSG_SPACE(sizeof(*ev) + chap_buf_size);
2062 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
2063 nlhchap->nlmsg_len = actual_size;
2064
2065 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
2066 GFP_KERNEL);
2067 } while (err < 0 && err != -ECONNREFUSED);
2068
2069exit_get_chap:
2070 scsi_host_put(shost);
2071 return err;
2072}
2073
2074static int iscsi_delete_chap(struct iscsi_transport *transport,
2075 struct iscsi_uevent *ev)
2076{
2077 struct Scsi_Host *shost;
2078 int err = 0;
2079
2080 if (!transport->delete_chap)
2081 return -ENOSYS;
2082
2083 shost = scsi_host_lookup(ev->u.delete_chap.host_no);
2084 if (!shost) {
2085 printk(KERN_ERR "%s could not find host no %u\n",
2086 __func__, ev->u.delete_chap.host_no);
2087 return -ENODEV;
2088 }
2089
2090 err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
2091 scsi_host_put(shost);
2092 return err;
2093}
2094
43514774
MC		 2095static int
2096iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
0896b752
AA		 2097{
2098 int err = 0;
2099 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
2100 struct iscsi_transport *transport = NULL;
2101 struct iscsi_internal *priv;
7b7232f3
MC		 2102 struct iscsi_cls_session *session;
2103 struct iscsi_cls_conn *conn;
d82ff9be 2104 struct iscsi_endpoint *ep = NULL;
0896b752 2105
43514774
MC		 2106 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
2107 *group = ISCSI_NL_GRP_UIP;
2108 else
2109 *group = ISCSI_NL_GRP_ISCSID;
2110
0896b752
AA		 2111 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
2112 if (!priv)
2113 return -EINVAL;
2114 transport = priv->iscsi_transport;
2115
7b7232f3
MC		 2116 if (!try_module_get(transport->owner))
2117 return -EINVAL;
2118
0896b752
AA		 2119 switch (nlh->nlmsg_type) {
2120 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 2121 err = iscsi_if_create_session(priv, ep, ev,
15e47304 2122 NETLINK_CB(skb).portid,
40753caa
MC		 2123 ev->u.c_session.initial_cmdsn,
2124 ev->u.c_session.cmds_max,
2125 ev->u.c_session.queue_depth);
2126 break;
2127 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 2128 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 2129 if (!ep) {
2130 err = -EINVAL;
2131 break;
2132 }
d82ff9be
MC		 2133
2134 err = iscsi_if_create_session(priv, ep, ev,
15e47304 2135 NETLINK_CB(skb).portid,
40753caa
MC		 2136 ev->u.c_bound_session.initial_cmdsn,
2137 ev->u.c_bound_session.cmds_max,
2138 ev->u.c_bound_session.queue_depth);
0896b752
AA		 2139 break;
2140 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 2141 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 2142 if (session)
7b7232f3 2143 transport->destroy_session(session);
26974789
MC		 2144 else
2145 err = -EINVAL;
2146 break;
2147 case ISCSI_UEVENT_UNBIND_SESSION:
2148 session = iscsi_session_lookup(ev->u.d_session.sid);
2149 if (session)
06d25af4
MC		 2150 scsi_queue_work(iscsi_session_to_shost(session),
2151 &session->unbind_work);
26974789 2152 else
7b7232f3 2153 err = -EINVAL;
0896b752
AA		 2154 break;
2155 case ISCSI_UEVENT_CREATE_CONN:
2156 err = iscsi_if_create_conn(transport, ev);
2157 break;
2158 case ISCSI_UEVENT_DESTROY_CONN:
2159 err = iscsi_if_destroy_conn(transport, ev);
2160 break;
2161 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 2162 session = iscsi_session_lookup(ev->u.b_conn.sid);
2163 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3 2164
22a39fbb
MC		 2165 if (conn && conn->ep)
2166 iscsi_if_ep_disconnect(transport, conn->ep->id);
2167
2168 if (!session || !conn) {
7b7232f3 2169 err = -EINVAL;
22a39fbb
MC		 2170 break;
2171 }
2172
2173 ev->r.retcode = transport->bind_conn(session, conn,
2174 ev->u.b_conn.transport_eph,
2175 ev->u.b_conn.is_leading);
2176 if (ev->r.retcode || !transport->ep_connect)
2177 break;
2178
2179 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2180 if (ep) {
2181 ep->conn = conn;
2182
2183 mutex_lock(&conn->ep_mutex);
2184 conn->ep = ep;
2185 mutex_unlock(&conn->ep_mutex);
2186 } else
2187 iscsi_cls_conn_printk(KERN_ERR, conn,
2188 "Could not set ep conn "
2189 "binding\n");
0896b752
AA		 2190 break;
2191 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 2192 err = iscsi_set_param(transport, ev);
0896b752
AA		 2193 break;
2194 case ISCSI_UEVENT_START_CONN:
b5c7a12d 2195 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 2196 if (conn)
2197 ev->r.retcode = transport->start_conn(conn);
2198 else
2199 err = -EINVAL;
0896b752
AA		 2200 break;
2201 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 2202 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 2203 if (conn)
2204 transport->stop_conn(conn, ev->u.stop_conn.flag);
2205 else
2206 err = -EINVAL;
0896b752
AA		 2207 break;
2208 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 2209 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 2210 if (conn)
2211 ev->r.retcode = transport->send_pdu(conn,
2212 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2213 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2214 ev->u.send_pdu.data_size);
2215 else
2216 err = -EINVAL;
0896b752
AA		 2217 break;
2218 case ISCSI_UEVENT_GET_STATS:
5b940adf 2219 err = iscsi_if_get_stats(transport, nlh);
0896b752 2220 break;
264faaaa
OG		 2221 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2222 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2223 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 2224 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 2225 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2226 break;
01cb225d
MC		 2227 case ISCSI_UEVENT_TGT_DSCVR:
2228 err = iscsi_tgt_dscvr(transport, ev);
2229 break;
1d9bf13a
MC		 2230 case ISCSI_UEVENT_SET_HOST_PARAM:
2231 err = iscsi_set_host_param(transport, ev);
2232 break;
43514774
MC		 2233 case ISCSI_UEVENT_PATH_UPDATE:
2234 err = iscsi_set_path(transport, ev);
2235 break;
56c155b5 2236 case ISCSI_UEVENT_SET_IFACE_PARAMS:
00c31889
MC		 2237 err = iscsi_set_iface_params(transport, ev,
2238 nlmsg_attrlen(nlh, sizeof(*ev)));
56c155b5 2239 break;
ac20c7bf
VC		 2240 case ISCSI_UEVENT_PING:
2241 err = iscsi_send_ping(transport, ev);
2242 break;
6260a5d2
NJ		 2243 case ISCSI_UEVENT_GET_CHAP:
2244 err = iscsi_get_chap(transport, nlh);
2245 break;
2246 case ISCSI_UEVENT_DELETE_CHAP:
2247 err = iscsi_delete_chap(transport, ev);
2248 break;
0896b752 2249 default:
1d9bf13a 2250 err = -ENOSYS;
0896b752
AA		 2251 break;
2252 }
2253
7b7232f3 2254 module_put(transport->owner);
0896b752
AA		 2255 return err;
2256}
2257
b5c7a12d 2258/*
cd40b7d3
DL		 2259 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
2260 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 2261 */
0896b752 2262static void
cd40b7d3 2263iscsi_if_rx(struct sk_buff *skb)
0896b752 2264{
0b950672 2265 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 2266 while (skb->len >= NLMSG_SPACE(0)) {
2267 int err;
2268 uint32_t rlen;
2269 struct nlmsghdr *nlh;
2270 struct iscsi_uevent *ev;
43514774 2271 uint32_t group;
cd40b7d3
DL		 2272
2273 nlh = nlmsg_hdr(skb);
2274 if (nlh->nlmsg_len < sizeof(*nlh) ||
2275 skb->len < nlh->nlmsg_len) {
2276 break;
ee7f8e40 2277 }
ee7f8e40 2278
cd40b7d3
DL		 2279 ev = NLMSG_DATA(nlh);
2280 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2281 if (rlen > skb->len)
2282 rlen = skb->len;
0896b752 2283
43514774 2284 err = iscsi_if_recv_msg(skb, nlh, &group);
cd40b7d3
DL		 2285 if (err) {
2286 ev->type = ISCSI_KEVENT_IF_ERROR;
2287 ev->iferror = err;
0896b752 2288 }
cd40b7d3
DL		 2289 do {
2290 /*
2291 * special case for GET_STATS:
2292 * on success - sending reply and stats from
2293 * inside of if_recv_msg(),
2294 * on error - fall through.
2295 */
2296 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2297 break;
6260a5d2
NJ		 2298 if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
2299 break;
43514774 2300 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
cd40b7d3 2301 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
46a7c17d 2302 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
cd40b7d3 2303 skb_pull(skb, rlen);
0896b752 2304 }
0b950672 2305 mutex_unlock(&rx_queue_mutex);
0896b752 2306}
1da177e4 2307
fd7255f5 2308#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 2309struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 2310 __ATTR(_name,_mode,_show,_store)
2311
1da177e4 2312/*
0896b752 2313 * iSCSI connection attrs
1da177e4 2314 */
a54a52ca 2315#define iscsi_conn_attr_show(param) \
0896b752 2316static ssize_t \
ee959b00
TJ		 2317show_conn_param_##param(struct device *dev, \
2318 struct device_attribute *attr, char *buf) \
0896b752 2319{ \
ee959b00 2320 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 2321 struct iscsi_transport *t = conn->transport; \
a54a52ca 2322 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 2323}
2324
a54a52ca
MC		 2325#define iscsi_conn_attr(field, param) \
2326 iscsi_conn_attr_show(param) \
2327static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 2328 NULL);
0896b752 2329
a54a52ca
MC		 2330iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2331iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2332iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2333iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2334iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2335iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2336iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
a54a52ca
MC		 2337iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2338iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
f6d5180c
MC		 2339iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2340iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4 2341
289324b0
MC		 2342#define iscsi_conn_ep_attr_show(param) \
2343static ssize_t show_conn_ep_param_##param(struct device *dev, \
2344 struct device_attribute *attr,\
2345 char *buf) \
2346{ \
2347 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
2348 struct iscsi_transport *t = conn->transport; \
2349 struct iscsi_endpoint *ep; \
2350 ssize_t rc; \
2351 \
2352 /* \
2353 * Need to make sure ep_disconnect does not free the LLD's \
2354 * interconnect resources while we are trying to read them. \
2355 */ \
2356 mutex_lock(&conn->ep_mutex); \
2357 ep = conn->ep; \
2358 if (!ep && t->ep_connect) { \
2359 mutex_unlock(&conn->ep_mutex); \
2360 return -ENOTCONN; \
2361 } \
2362 \
2363 if (ep) \
2364 rc = t->get_ep_param(ep, param, buf); \
2365 else \
2366 rc = t->get_conn_param(conn, param, buf); \
2367 mutex_unlock(&conn->ep_mutex); \
2368 return rc; \
2369}
2370
2371#define iscsi_conn_ep_attr(field, param) \
2372 iscsi_conn_ep_attr_show(param) \
2373static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
2374 show_conn_ep_param_##param, NULL);
2375
2376iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2377iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2378
3128c6c7
MC		 2379static struct attribute *iscsi_conn_attrs[] = {
2380 &dev_attr_conn_max_recv_dlength.attr,
2381 &dev_attr_conn_max_xmit_dlength.attr,
2382 &dev_attr_conn_header_digest.attr,
2383 &dev_attr_conn_data_digest.attr,
2384 &dev_attr_conn_ifmarker.attr,
2385 &dev_attr_conn_ofmarker.attr,
2386 &dev_attr_conn_address.attr,
2387 &dev_attr_conn_port.attr,
2388 &dev_attr_conn_exp_statsn.attr,
2389 &dev_attr_conn_persistent_address.attr,
2390 &dev_attr_conn_persistent_port.attr,
2391 &dev_attr_conn_ping_tmo.attr,
2392 &dev_attr_conn_recv_tmo.attr,
2393 NULL,
2394};
2395
587a1f16 2396static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3128c6c7
MC		 2397 struct attribute *attr, int i)
2398{
2399 struct device *cdev = container_of(kobj, struct device, kobj);
2400 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2401 struct iscsi_transport *t = conn->transport;
2402 int param;
2403
2404 if (attr == &dev_attr_conn_max_recv_dlength.attr)
2405 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2406 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2407 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2408 else if (attr == &dev_attr_conn_header_digest.attr)
2409 param = ISCSI_PARAM_HDRDGST_EN;
2410 else if (attr == &dev_attr_conn_data_digest.attr)
2411 param = ISCSI_PARAM_DATADGST_EN;
2412 else if (attr == &dev_attr_conn_ifmarker.attr)
2413 param = ISCSI_PARAM_IFMARKER_EN;
2414 else if (attr == &dev_attr_conn_ofmarker.attr)
2415 param = ISCSI_PARAM_OFMARKER_EN;
2416 else if (attr == &dev_attr_conn_address.attr)
2417 param = ISCSI_PARAM_CONN_ADDRESS;
2418 else if (attr == &dev_attr_conn_port.attr)
2419 param = ISCSI_PARAM_CONN_PORT;
2420 else if (attr == &dev_attr_conn_exp_statsn.attr)
2421 param = ISCSI_PARAM_EXP_STATSN;
2422 else if (attr == &dev_attr_conn_persistent_address.attr)
2423 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2424 else if (attr == &dev_attr_conn_persistent_port.attr)
2425 param = ISCSI_PARAM_PERSISTENT_PORT;
2426 else if (attr == &dev_attr_conn_ping_tmo.attr)
2427 param = ISCSI_PARAM_PING_TMO;
2428 else if (attr == &dev_attr_conn_recv_tmo.attr)
2429 param = ISCSI_PARAM_RECV_TMO;
2430 else {
2431 WARN_ONCE(1, "Invalid conn attr");
2432 return 0;
2433 }
2434
2435 return t->attr_is_visible(ISCSI_PARAM, param);
2436}
2437
2438static struct attribute_group iscsi_conn_group = {
2439 .attrs = iscsi_conn_attrs,
2440 .is_visible = iscsi_conn_attr_is_visible,
2441};
2442
1da177e4 2443/*
0896b752 2444 * iSCSI session attrs
1da177e4 2445 */
b2c64167 2446#define iscsi_session_attr_show(param, perm) \
fd7255f5 2447static ssize_t \
ee959b00
TJ		 2448show_session_param_##param(struct device *dev, \
2449 struct device_attribute *attr, char *buf) \
fd7255f5 2450{ \
ee959b00
TJ		 2451 struct iscsi_cls_session *session = \
2452 iscsi_dev_to_session(dev->parent); \
fd7255f5 2453 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 2454 \
2455 if (perm && !capable(CAP_SYS_ADMIN)) \
2456 return -EACCES; \
a54a52ca 2457 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 2458}
2459
b2c64167
MC		 2460#define iscsi_session_attr(field, param, perm) \
2461 iscsi_session_attr_show(param, perm) \
a54a52ca 2462static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5 2463 NULL);
b2c64167
MC		 2464iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2465iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2466iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2467iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2468iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2469iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2470iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2471iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2472iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2473iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2474iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2475iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2476iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2477iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
30534952
MC		 2478iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
2479iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4cd49ea1
MC		 2480iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2481iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2482iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3fe5ae8b 2483iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
88dfd340 2484iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3b2bef1f
VC		 2485iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2486iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1da177e4 2487
6eabafbe 2488static ssize_t
ee959b00
TJ		 2489show_priv_session_state(struct device *dev, struct device_attribute *attr,
2490 char *buf)
6eabafbe 2491{
ee959b00 2492 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 2493 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2494}
2495static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2496 NULL);
0c70d84b
MC		 2497static ssize_t
2498show_priv_session_creator(struct device *dev, struct device_attribute *attr,
2499 char *buf)
2500{
2501 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2502 return sprintf(buf, "%d\n", session->creator);
2503}
2504static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
2505 NULL);
6eabafbe 2506
fd7255f5
MC		 2507#define iscsi_priv_session_attr_show(field, format) \
2508static ssize_t \
ee959b00
TJ		 2509show_priv_session_##field(struct device *dev, \
2510 struct device_attribute *attr, char *buf) \
fd7255f5 2511{ \
ee959b00
TJ		 2512 struct iscsi_cls_session *session = \
2513 iscsi_dev_to_session(dev->parent); \
fe4f0bde
VC		 2514 if (session->field == -1) \
2515 return sprintf(buf, "off\n"); \
fd7255f5
MC		 2516 return sprintf(buf, format"\n", session->field); \
2517}
2518
fe4f0bde
VC		 2519#define iscsi_priv_session_attr_store(field) \
2520static ssize_t \
2521store_priv_session_##field(struct device *dev, \
2522 struct device_attribute *attr, \
2523 const char *buf, size_t count) \
2524{ \
2525 int val; \
2526 char *cp; \
2527 struct iscsi_cls_session *session = \
2528 iscsi_dev_to_session(dev->parent); \
2529 if ((session->state == ISCSI_SESSION_FREE) || \
2530 (session->state == ISCSI_SESSION_FAILED)) \
2531 return -EBUSY; \
2532 if (strncmp(buf, "off", 3) == 0) \
2533 session->field = -1; \
2534 else { \
2535 val = simple_strtoul(buf, &cp, 0); \
2536 if (*cp != '\0' && *cp != '\n') \
2537 return -EINVAL; \
2538 session->field = val; \
2539 } \
2540 return count; \
2541}
2542
2543#define iscsi_priv_session_rw_attr(field, format) \
fd7255f5 2544 iscsi_priv_session_attr_show(field, format) \
fe4f0bde 2545 iscsi_priv_session_attr_store(field) \
523f3c80 2546static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
fe4f0bde
VC		 2547 show_priv_session_##field, \
2548 store_priv_session_##field)
2549iscsi_priv_session_rw_attr(recovery_tmo, "%d");
fd7255f5 2550
1d063c17
MC		 2551static struct attribute *iscsi_session_attrs[] = {
2552 &dev_attr_sess_initial_r2t.attr,
2553 &dev_attr_sess_max_outstanding_r2t.attr,
2554 &dev_attr_sess_immediate_data.attr,
2555 &dev_attr_sess_first_burst_len.attr,
2556 &dev_attr_sess_max_burst_len.attr,
2557 &dev_attr_sess_data_pdu_in_order.attr,
2558 &dev_attr_sess_data_seq_in_order.attr,
2559 &dev_attr_sess_erl.attr,
2560 &dev_attr_sess_targetname.attr,
2561 &dev_attr_sess_tpgt.attr,
2562 &dev_attr_sess_password.attr,
2563 &dev_attr_sess_password_in.attr,
2564 &dev_attr_sess_username.attr,
2565 &dev_attr_sess_username_in.attr,
2566 &dev_attr_sess_fast_abort.attr,
2567 &dev_attr_sess_abort_tmo.attr,
2568 &dev_attr_sess_lu_reset_tmo.attr,
2569 &dev_attr_sess_tgt_reset_tmo.attr,
2570 &dev_attr_sess_ifacename.attr,
2571 &dev_attr_sess_initiatorname.attr,
2572 &dev_attr_sess_targetalias.attr,
2573 &dev_attr_priv_sess_recovery_tmo.attr,
2574 &dev_attr_priv_sess_state.attr,
0c70d84b 2575 &dev_attr_priv_sess_creator.attr,
30534952
MC		 2576 &dev_attr_sess_chap_out_idx.attr,
2577 &dev_attr_sess_chap_in_idx.attr,
1d063c17
MC		 2578 NULL,
2579};
2580
587a1f16 2581static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
1d063c17
MC		 2582 struct attribute *attr, int i)
2583{
2584 struct device *cdev = container_of(kobj, struct device, kobj);
2585 struct iscsi_cls_session *session = transport_class_to_session(cdev);
2586 struct iscsi_transport *t = session->transport;
2587 int param;
2588
2589 if (attr == &dev_attr_sess_initial_r2t.attr)
2590 param = ISCSI_PARAM_INITIAL_R2T_EN;
2591 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2592 param = ISCSI_PARAM_MAX_R2T;
2593 else if (attr == &dev_attr_sess_immediate_data.attr)
2594 param = ISCSI_PARAM_IMM_DATA_EN;
2595 else if (attr == &dev_attr_sess_first_burst_len.attr)
2596 param = ISCSI_PARAM_FIRST_BURST;
2597 else if (attr == &dev_attr_sess_max_burst_len.attr)
2598 param = ISCSI_PARAM_MAX_BURST;
2599 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2600 param = ISCSI_PARAM_PDU_INORDER_EN;
2601 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2602 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2603 else if (attr == &dev_attr_sess_erl.attr)
2604 param = ISCSI_PARAM_ERL;
2605 else if (attr == &dev_attr_sess_targetname.attr)
2606 param = ISCSI_PARAM_TARGET_NAME;
2607 else if (attr == &dev_attr_sess_tpgt.attr)
2608 param = ISCSI_PARAM_TPGT;
30534952
MC		 2609 else if (attr == &dev_attr_sess_chap_in_idx.attr)
2610 param = ISCSI_PARAM_CHAP_IN_IDX;
2611 else if (attr == &dev_attr_sess_chap_out_idx.attr)
2612 param = ISCSI_PARAM_CHAP_OUT_IDX;
1d063c17
MC		 2613 else if (attr == &dev_attr_sess_password.attr)
2614 param = ISCSI_PARAM_USERNAME;
2615 else if (attr == &dev_attr_sess_password_in.attr)
2616 param = ISCSI_PARAM_USERNAME_IN;
2617 else if (attr == &dev_attr_sess_username.attr)
2618 param = ISCSI_PARAM_PASSWORD;
2619 else if (attr == &dev_attr_sess_username_in.attr)
2620 param = ISCSI_PARAM_PASSWORD_IN;
2621 else if (attr == &dev_attr_sess_fast_abort.attr)
2622 param = ISCSI_PARAM_FAST_ABORT;
2623 else if (attr == &dev_attr_sess_abort_tmo.attr)
2624 param = ISCSI_PARAM_ABORT_TMO;
2625 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2626 param = ISCSI_PARAM_LU_RESET_TMO;
2627 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2628 param = ISCSI_PARAM_TGT_RESET_TMO;
2629 else if (attr == &dev_attr_sess_ifacename.attr)
2630 param = ISCSI_PARAM_IFACE_NAME;
2631 else if (attr == &dev_attr_sess_initiatorname.attr)
2632 param = ISCSI_PARAM_INITIATOR_NAME;
2633 else if (attr == &dev_attr_sess_targetalias.attr)
2634 param = ISCSI_PARAM_TARGET_ALIAS;
2635 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2636 return S_IRUGO | S_IWUSR;
2637 else if (attr == &dev_attr_priv_sess_state.attr)
2638 return S_IRUGO;
0c70d84b
MC		 2639 else if (attr == &dev_attr_priv_sess_creator.attr)
2640 return S_IRUGO;
1d063c17
MC		 2641 else {
2642 WARN_ONCE(1, "Invalid session attr");
2643 return 0;
2644 }
2645
2646 return t->attr_is_visible(ISCSI_PARAM, param);
2647}
2648
2649static struct attribute_group iscsi_session_group = {
2650 .attrs = iscsi_session_attrs,
2651 .is_visible = iscsi_session_attr_is_visible,
2652};
2653
1819dc81
MC		 2654/*
2655 * iSCSI host attrs
2656 */
2657#define iscsi_host_attr_show(param) \
2658static ssize_t \
ee959b00
TJ		 2659show_host_param_##param(struct device *dev, \
2660 struct device_attribute *attr, char *buf) \
1819dc81 2661{ \
ee959b00 2662 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 2663 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2664 return priv->iscsi_transport->get_host_param(shost, param, buf); \
2665}
2666
2667#define iscsi_host_attr(field, param) \
2668 iscsi_host_attr_show(param) \
2669static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
2670 NULL);
2671
d8196ed2 2672iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 2673iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 2674iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 2675iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
aeddde29
VC		 2676iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
2677iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
1819dc81 2678
f27fb2ef
MC		 2679static struct attribute *iscsi_host_attrs[] = {
2680 &dev_attr_host_netdev.attr,
2681 &dev_attr_host_hwaddress.attr,
2682 &dev_attr_host_ipaddress.attr,
2683 &dev_attr_host_initiatorname.attr,
aeddde29
VC		 2684 &dev_attr_host_port_state.attr,
2685 &dev_attr_host_port_speed.attr,
f27fb2ef
MC		 2686 NULL,
2687};
2688
587a1f16 2689static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
f27fb2ef
MC		 2690 struct attribute *attr, int i)
2691{
2692 struct device *cdev = container_of(kobj, struct device, kobj);
2693 struct Scsi_Host *shost = transport_class_to_shost(cdev);
2694 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2695 int param;
2696
2697 if (attr == &dev_attr_host_netdev.attr)
2698 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2699 else if (attr == &dev_attr_host_hwaddress.attr)
2700 param = ISCSI_HOST_PARAM_HWADDRESS;
2701 else if (attr == &dev_attr_host_ipaddress.attr)
2702 param = ISCSI_HOST_PARAM_IPADDRESS;
2703 else if (attr == &dev_attr_host_initiatorname.attr)
2704 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
aeddde29
VC		 2705 else if (attr == &dev_attr_host_port_state.attr)
2706 param = ISCSI_HOST_PARAM_PORT_STATE;
2707 else if (attr == &dev_attr_host_port_speed.attr)
2708 param = ISCSI_HOST_PARAM_PORT_SPEED;
f27fb2ef
MC		 2709 else {
2710 WARN_ONCE(1, "Invalid host attr");
2711 return 0;
2712 }
2713
2714 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2715}
2716
2717static struct attribute_group iscsi_host_group = {
2718 .attrs = iscsi_host_attrs,
2719 .is_visible = iscsi_host_attr_is_visible,
2720};
1819dc81 2721
aeddde29
VC		 2722/* convert iscsi_port_speed values to ascii string name */
2723static const struct {
2724 enum iscsi_port_speed value;
2725 char *name;
2726} iscsi_port_speed_names[] = {
2727 {ISCSI_PORT_SPEED_UNKNOWN, "Unknown" },
2728 {ISCSI_PORT_SPEED_10MBPS, "10 Mbps" },
2729 {ISCSI_PORT_SPEED_100MBPS, "100 Mbps" },
2730 {ISCSI_PORT_SPEED_1GBPS, "1 Gbps" },
2731 {ISCSI_PORT_SPEED_10GBPS, "10 Gbps" },
2732};
2733
2734char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
2735{
2736 int i;
2737 char *speed = "Unknown!";
2738 struct iscsi_cls_host *ihost = shost->shost_data;
2739 uint32_t port_speed = ihost->port_speed;
2740
2741 for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
2742 if (iscsi_port_speed_names[i].value & port_speed) {
2743 speed = iscsi_port_speed_names[i].name;
2744 break;
2745 }
2746 }
2747 return speed;
2748}
2749EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
2750
2751/* convert iscsi_port_state values to ascii string name */
2752static const struct {
2753 enum iscsi_port_state value;
2754 char *name;
2755} iscsi_port_state_names[] = {
2756 {ISCSI_PORT_STATE_DOWN, "LINK DOWN" },
2757 {ISCSI_PORT_STATE_UP, "LINK UP" },
2758};
2759
2760char *iscsi_get_port_state_name(struct Scsi_Host *shost)
2761{
2762 int i;
2763 char *state = "Unknown!";
2764 struct iscsi_cls_host *ihost = shost->shost_data;
2765 uint32_t port_state = ihost->port_state;
2766
2767 for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
2768 if (iscsi_port_state_names[i].value & port_state) {
2769 state = iscsi_port_state_names[i].name;
2770 break;
2771 }
2772 }
2773 return state;
2774}
2775EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
2776
0896b752
AA		 2777static int iscsi_session_match(struct attribute_container *cont,
2778 struct device *dev)
1da177e4 2779{
7b8631b5 2780 struct iscsi_cls_session *session;
1da177e4 2781 struct Scsi_Host *shost;
0896b752
AA		 2782 struct iscsi_internal *priv;
2783
2784 if (!iscsi_is_session_dev(dev))
2785 return 0;
1da177e4 2786
7b8631b5
MC		 2787 session = iscsi_dev_to_session(dev);
2788 shost = iscsi_session_to_shost(session);
0896b752 2789 if (!shost->transportt)
1da177e4
LT		 2790 return 0;
2791
0896b752
AA		 2792 priv = to_iscsi_internal(shost->transportt);
2793 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 2794 return 0;
2795
0896b752 2796 return &priv->session_cont.ac == cont;
1da177e4
LT		 2797}
2798
0896b752
AA		 2799static int iscsi_conn_match(struct attribute_container *cont,
2800 struct device *dev)
2801{
7b8631b5
MC		 2802 struct iscsi_cls_session *session;
2803 struct iscsi_cls_conn *conn;
1da177e4 2804 struct Scsi_Host *shost;
0896b752 2805 struct iscsi_internal *priv;
1da177e4 2806
0896b752 2807 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 2808 return 0;
2809
7b8631b5
MC		 2810 conn = iscsi_dev_to_conn(dev);
2811 session = iscsi_dev_to_session(conn->dev.parent);
2812 shost = iscsi_session_to_shost(session);
2813
0896b752 2814 if (!shost->transportt)
1da177e4
LT		 2815 return 0;
2816
0896b752
AA		 2817 priv = to_iscsi_internal(shost->transportt);
2818 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2819 return 0;
1da177e4 2820
0896b752
AA		 2821 return &priv->conn_cont.ac == cont;
2822}
2823
30a6c652
MC		 2824static int iscsi_host_match(struct attribute_container *cont,
2825 struct device *dev)
2826{
2827 struct Scsi_Host *shost;
2828 struct iscsi_internal *priv;
2829
2830 if (!scsi_is_host_device(dev))
2831 return 0;
2832
2833 shost = dev_to_shost(dev);
2834 if (!shost->transportt ||
2835 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2836 return 0;
2837
2838 priv = to_iscsi_internal(shost->transportt);
2839 return &priv->t.host_attrs.ac == cont;
2840}
2841
7b8631b5
MC		 2842struct scsi_transport_template *
2843iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 2844{
2845 struct iscsi_internal *priv;
2846 unsigned long flags;
f27fb2ef 2847 int err;
0896b752
AA		 2848
2849 BUG_ON(!tt);
2850
2851 priv = iscsi_if_transport_lookup(tt);
2852 if (priv)
7b8631b5 2853 return NULL;
0896b752 2854
24669f75 2855 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 2856 if (!priv)
7b8631b5 2857 return NULL;
0896b752 2858 INIT_LIST_HEAD(&priv->list);
0896b752 2859 priv->iscsi_transport = tt;
30a6c652 2860 priv->t.user_scan = iscsi_user_scan;
06d25af4 2861 priv->t.create_work_queue = 1;
0896b752 2862
ee959b00 2863 priv->dev.class = &iscsi_transport_class;
71610f55 2864 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 2865 err = device_register(&priv->dev);
0896b752
AA		 2866 if (err)
2867 goto free_priv;
2868
ee959b00 2869 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 2870 if (err)
ee959b00 2871 goto unregister_dev;
0896b752 2872
30a6c652 2873 /* host parameters */
30a6c652
MC		 2874 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2875 priv->t.host_attrs.ac.match = iscsi_host_match;
f27fb2ef 2876 priv->t.host_attrs.ac.grp = &iscsi_host_group;
32c6e1b9 2877 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 2878 transport_container_register(&priv->t.host_attrs);
2879
0896b752 2880 /* connection parameters */
0896b752
AA		 2881 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2882 priv->conn_cont.ac.match = iscsi_conn_match;
3128c6c7 2883 priv->conn_cont.ac.grp = &iscsi_conn_group;
0896b752 2884 transport_container_register(&priv->conn_cont);
1da177e4 2885
0896b752 2886 /* session parameters */
0896b752
AA		 2887 priv->session_cont.ac.class = &iscsi_session_class.class;
2888 priv->session_cont.ac.match = iscsi_session_match;
1d063c17 2889 priv->session_cont.ac.grp = &iscsi_session_group;
0896b752
AA		 2890 transport_container_register(&priv->session_cont);
2891
0896b752
AA		 2892 spin_lock_irqsave(&iscsi_transport_lock, flags);
2893 list_add(&priv->list, &iscsi_transports);
2894 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2895
2896 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 2897 return &priv->t;
1da177e4 2898
ee959b00
TJ		 2899unregister_dev:
2900 device_unregister(&priv->dev);
d82ff9be 2901 return NULL;
0896b752
AA		 2902free_priv:
2903 kfree(priv);
7b8631b5 2904 return NULL;
1da177e4 2905}
0896b752
AA		 2906EXPORT_SYMBOL_GPL(iscsi_register_transport);
2907
2908int iscsi_unregister_transport(struct iscsi_transport *tt)
2909{
2910 struct iscsi_internal *priv;
2911 unsigned long flags;
2912
2913 BUG_ON(!tt);
2914
0b950672 2915 mutex_lock(&rx_queue_mutex);
0896b752
AA		 2916
2917 priv = iscsi_if_transport_lookup(tt);
2918 BUG_ON (!priv);
2919
0896b752
AA		 2920 spin_lock_irqsave(&iscsi_transport_lock, flags);
2921 list_del(&priv->list);
2922 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2923
2924 transport_container_unregister(&priv->conn_cont);
2925 transport_container_unregister(&priv->session_cont);
30a6c652 2926 transport_container_unregister(&priv->t.host_attrs);
0896b752 2927
ee959b00
TJ		 2928 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2929 device_unregister(&priv->dev);
0b950672 2930 mutex_unlock(&rx_queue_mutex);
1da177e4 2931
0896b752
AA		 2932 return 0;
2933}
2934EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 2935
1da177e4
LT		 2936static __init int iscsi_transport_init(void)
2937{
0896b752 2938 int err;
a31f2d17
PNA		 2939 struct netlink_kernel_cfg cfg = {
2940 .groups = 1,
2941 .input = iscsi_if_rx,
2942 };
09492605 2943 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 2944 ISCSI_TRANSPORT_VERSION);
2945
41be1444
MC		 2946 atomic_set(&iscsi_session_nr, 0);
2947
0896b752 2948 err = class_register(&iscsi_transport_class);
1da177e4
LT		 2949 if (err)
2950 return err;
0896b752 2951
d82ff9be 2952 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 2953 if (err)
2954 goto unregister_transport_class;
2955
8d07913d 2956 err = class_register(&iscsi_iface_class);
d82ff9be
MC		 2957 if (err)
2958 goto unregister_endpoint_class;
2959
8d07913d
MC		 2960 err = transport_class_register(&iscsi_host_class);
2961 if (err)
2962 goto unregister_iface_class;
2963
30a6c652
MC		 2964 err = transport_class_register(&iscsi_connection_class);
2965 if (err)
2966 goto unregister_host_class;
2967
0896b752
AA		 2968 err = transport_class_register(&iscsi_session_class);
2969 if (err)
2970 goto unregister_conn_class;
2971
9f00d977 2972 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
0896b752
AA		 2973 if (!nls) {
2974 err = -ENOBUFS;
43a145a3 2975 goto unregister_session_class;
0896b752
AA		 2976 }
2977
d8bf541e
MC		 2978 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2979 if (!iscsi_eh_timer_workq)
2980 goto release_nls;
2981
43a145a3 2982 return 0;
0896b752 2983
d8bf541e 2984release_nls:
b7c6ba6e 2985 netlink_kernel_release(nls);
0896b752
AA		 2986unregister_session_class:
2987 transport_class_unregister(&iscsi_session_class);
2988unregister_conn_class:
2989 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 2990unregister_host_class:
2991 transport_class_unregister(&iscsi_host_class);
8d07913d
MC		 2992unregister_iface_class:
2993 class_unregister(&iscsi_iface_class);
d82ff9be
MC		 2994unregister_endpoint_class:
2995 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 2996unregister_transport_class:
2997 class_unregister(&iscsi_transport_class);
2998 return err;
1da177e4
LT		 2999}
3000
3001static void __exit iscsi_transport_exit(void)
3002{
d8bf541e 3003 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 3004 netlink_kernel_release(nls);
0896b752
AA		 3005 transport_class_unregister(&iscsi_connection_class);
3006 transport_class_unregister(&iscsi_session_class);
30a6c652 3007 transport_class_unregister(&iscsi_host_class);
d82ff9be 3008 class_unregister(&iscsi_endpoint_class);
8d07913d 3009 class_unregister(&iscsi_iface_class);
0896b752 3010 class_unregister(&iscsi_transport_class);
1da177e4
LT		 3011}
3012
3013module_init(iscsi_transport_init);
3014module_exit(iscsi_transport_exit);
3015
0896b752
AA		 3016MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
3017 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
3018 "Alex Aizman <itn780@yahoo.com>");
3019MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 3020MODULE_LICENSE("GPL");
f4246b33 3021MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
058548ae 3022MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
kernel source for telekom puls (alcatel/mediatek)