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Merge branch 'for-3.6/core' of git://git.kernel.dk/linux-block
[~shefty/rdma-dev.git] / drivers / scsi / scsi_transport_iscsi.c
1 /*
2  * iSCSI transport class definitions
3  *
4  * Copyright (C) IBM Corporation, 2004
5  * Copyright (C) Mike Christie, 2004 - 2005
6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
7  * Copyright (C) Alex Aizman, 2004 - 2005
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>
24 #include <linux/mutex.h>
25 #include <linux/slab.h>
26 #include <linux/bsg-lib.h>
27 #include <linux/idr.h>
28 #include <net/tcp.h>
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>
34 #include <scsi/iscsi_if.h>
35 #include <scsi/scsi_cmnd.h>
36 #include <scsi/scsi_bsg_iscsi.h>
37
38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
39
40 static int dbg_session;
41 module_param_named(debug_session, dbg_session, int,
42                    S_IRUGO | S_IWUSR);
43 MODULE_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
48 static int dbg_conn;
49 module_param_named(debug_conn, dbg_conn, int,
50                    S_IRUGO | S_IWUSR);
51 MODULE_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
72 struct iscsi_internal {
73         struct scsi_transport_template t;
74         struct iscsi_transport *iscsi_transport;
75         struct list_head list;
76         struct device dev;
77
78         struct transport_container conn_cont;
79         struct transport_container session_cont;
80 };
81
82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
83 static struct workqueue_struct *iscsi_eh_timer_workq;
84
85 static DEFINE_IDA(iscsi_sess_ida);
86 /*
87  * list of registered transports and lock that must
88  * be held while accessing list. The iscsi_transport_lock must
89  * be acquired after the rx_queue_mutex.
90  */
91 static LIST_HEAD(iscsi_transports);
92 static DEFINE_SPINLOCK(iscsi_transport_lock);
93
94 #define to_iscsi_internal(tmpl) \
95         container_of(tmpl, struct iscsi_internal, t)
96
97 #define dev_to_iscsi_internal(_dev) \
98         container_of(_dev, struct iscsi_internal, dev)
99
100 static void iscsi_transport_release(struct device *dev)
101 {
102         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
103         kfree(priv);
104 }
105
106 /*
107  * iscsi_transport_class represents the iscsi_transports that are
108  * registered.
109  */
110 static struct class iscsi_transport_class = {
111         .name = "iscsi_transport",
112         .dev_release = iscsi_transport_release,
113 };
114
115 static ssize_t
116 show_transport_handle(struct device *dev, struct device_attribute *attr,
117                       char *buf)
118 {
119         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
120         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
121 }
122 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
123
124 #define show_transport_attr(name, format)                               \
125 static ssize_t                                                          \
126 show_transport_##name(struct device *dev,                               \
127                       struct device_attribute *attr,char *buf)          \
128 {                                                                       \
129         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
130         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
131 }                                                                       \
132 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
133
134 show_transport_attr(caps, "0x%x");
135
136 static struct attribute *iscsi_transport_attrs[] = {
137         &dev_attr_handle.attr,
138         &dev_attr_caps.attr,
139         NULL,
140 };
141
142 static struct attribute_group iscsi_transport_group = {
143         .attrs = iscsi_transport_attrs,
144 };
145
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)    \
153 struct device_attribute dev_attr_##_prefix##_##_name =  \
154         __ATTR(_name,_mode,_show,_store)
155
156 static void iscsi_endpoint_release(struct device *dev)
157 {
158         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
159         kfree(ep);
160 }
161
162 static struct class iscsi_endpoint_class = {
163         .name = "iscsi_endpoint",
164         .dev_release = iscsi_endpoint_release,
165 };
166
167 static ssize_t
168 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
169 {
170         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
171         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
172 }
173 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
174
175 static struct attribute *iscsi_endpoint_attrs[] = {
176         &dev_attr_ep_handle.attr,
177         NULL,
178 };
179
180 static struct attribute_group iscsi_endpoint_group = {
181         .attrs = iscsi_endpoint_attrs,
182 };
183
184 #define ISCSI_MAX_EPID -1
185
186 static int iscsi_match_epid(struct device *dev, void *data)
187 {
188         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
189         uint64_t *epid = (uint64_t *) data;
190
191         return *epid == ep->id;
192 }
193
194 struct iscsi_endpoint *
195 iscsi_create_endpoint(int dd_size)
196 {
197         struct device *dev;
198         struct iscsi_endpoint *ep;
199         uint64_t id;
200         int err;
201
202         for (id = 1; id < ISCSI_MAX_EPID; id++) {
203                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
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;
220         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
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
233 unregister_dev:
234         device_unregister(&ep->dev);
235         return NULL;
236
237 free_ep:
238         kfree(ep);
239         return NULL;
240 }
241 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
242
243 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
244 {
245         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
246         device_unregister(&ep->dev);
247 }
248 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
249
250 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
251 {
252         struct iscsi_endpoint *ep;
253         struct device *dev;
254
255         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
256                                 iscsi_match_epid);
257         if (!dev)
258                 return NULL;
259
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;
267 }
268 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
269
270 /*
271  * Interface to display network param to sysfs
272  */
273
274 static 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
284 static 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)  \
290 struct 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)            \
295 static ssize_t                                                          \
296 show_##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)       \
306 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
307
308 /* generic read only ipvi4 attribute */
309 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
310 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
311 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
312 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
313
314 /* generic read only ipv6 attribute */
315 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
316 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
317 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
318 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
319                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
320 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
321                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
322
323 /* common read only iface attribute */
324 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
325 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
326 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
327 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
328 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
329 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
330
331 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
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;
337         int param;
338
339         if (attr == &dev_attr_iface_enabled.attr)
340                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
341         else if (attr == &dev_attr_iface_vlan_id.attr)
342                 param = ISCSI_NET_PARAM_VLAN_ID;
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;
347         else if (attr == &dev_attr_iface_mtu.attr)
348                 param = ISCSI_NET_PARAM_MTU;
349         else if (attr == &dev_attr_iface_port.attr)
350                 param = ISCSI_NET_PARAM_PORT;
351         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
352                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
353                         param = ISCSI_NET_PARAM_IPV4_ADDR;
354                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
355                         param = ISCSI_NET_PARAM_IPV4_GW;
356                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
357                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
358                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
359                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
360                 else
361                         return 0;
362         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
363                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
364                         param = ISCSI_NET_PARAM_IPV6_ADDR;
365                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
366                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
367                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
368                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
369                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
370                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
371                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
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;
378         }
379
380         return t->attr_is_visible(ISCSI_NET_PARAM, param);
381 }
382
383 static struct attribute *iscsi_iface_attrs[] = {
384         &dev_attr_iface_enabled.attr,
385         &dev_attr_iface_vlan_id.attr,
386         &dev_attr_iface_vlan_priority.attr,
387         &dev_attr_iface_vlan_enabled.attr,
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,
396         &dev_attr_ipv6_iface_link_local_autocfg.attr,
397         &dev_attr_iface_mtu.attr,
398         &dev_attr_iface_port.attr,
399         NULL,
400 };
401
402 static struct attribute_group iscsi_iface_group = {
403         .attrs = iscsi_iface_attrs,
404         .is_visible = iscsi_iface_attr_is_visible,
405 };
406
407 struct iscsi_iface *
408 iscsi_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
444 unreg_iface:
445         device_unregister(&iface->dev);
446         return NULL;
447
448 free_iface:
449         put_device(iface->dev.parent);
450         kfree(iface);
451         return NULL;
452 }
453 EXPORT_SYMBOL_GPL(iscsi_create_iface);
454
455 void iscsi_destroy_iface(struct iscsi_iface *iface)
456 {
457         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
458         device_unregister(&iface->dev);
459 }
460 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
461
462 /*
463  * BSG support
464  */
465 /**
466  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
467  * @job: bsg job to be processed
468  */
469 static 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
510 fail_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
523  * @ihost: iscsi_cls_host adding the structures to
524  */
525 static int
526 iscsi_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
555 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
556                             struct device *cdev)
557 {
558         struct Scsi_Host *shost = dev_to_shost(dev);
559         struct iscsi_cls_host *ihost = shost->shost_data;
560
561         memset(ihost, 0, sizeof(*ihost));
562         atomic_set(&ihost->nr_scans, 0);
563         mutex_init(&ihost->mutex);
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
571 static int iscsi_remove_host(struct transport_container *tc,
572                              struct device *dev, struct device *cdev)
573 {
574         struct Scsi_Host *shost = dev_to_shost(dev);
575         struct iscsi_cls_host *ihost = shost->shost_data;
576
577         if (ihost->bsg_q) {
578                 bsg_unregister_queue(ihost->bsg_q);
579                 blk_cleanup_queue(ihost->bsg_q);
580         }
581         return 0;
582 }
583
584 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
585                                "iscsi_host",
586                                iscsi_setup_host,
587                                iscsi_remove_host,
588                                NULL);
589
590 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
591                                "iscsi_session",
592                                NULL,
593                                NULL,
594                                NULL);
595
596 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
597                                "iscsi_connection",
598                                NULL,
599                                NULL,
600                                NULL);
601
602 static struct sock *nls;
603 static DEFINE_MUTEX(rx_queue_mutex);
604
605 static LIST_HEAD(sesslist);
606 static DEFINE_SPINLOCK(sesslock);
607 static LIST_HEAD(connlist);
608 static DEFINE_SPINLOCK(connlock);
609
610 static 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  */
619 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
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) {
626                 if (sess->sid == sid) {
627                         spin_unlock_irqrestore(&sesslock, flags);
628                         return sess;
629                 }
630         }
631         spin_unlock_irqrestore(&sesslock, flags);
632         return NULL;
633 }
634
635 /*
636  * Returns the matching connection to a given sid / cid tuple
637  */
638 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
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) {
645                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
646                         spin_unlock_irqrestore(&connlock, flags);
647                         return conn;
648                 }
649         }
650         spin_unlock_irqrestore(&connlock, flags);
651         return NULL;
652 }
653
654 /*
655  * The following functions can be used by LLDs that allocate
656  * their own scsi_hosts or by software iscsi LLDs
657  */
658 static 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
667 static const char *iscsi_session_state_name(int state)
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
681 int 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:
692                 err = DID_IMM_RETRY << 16;
693                 break;
694         case ISCSI_SESSION_FREE:
695                 err = DID_TRANSPORT_FAILFAST << 16;
696                 break;
697         default:
698                 err = DID_NO_CONNECT << 16;
699                 break;
700         }
701         spin_unlock_irqrestore(&session->lock, flags);
702         return err;
703 }
704 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
705
706 int 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 }
717 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
718
719 static void iscsi_session_release(struct device *dev)
720 {
721         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
722         struct Scsi_Host *shost;
723
724         shost = iscsi_session_to_shost(session);
725         scsi_host_put(shost);
726         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
727         kfree(session);
728 }
729
730 int iscsi_is_session_dev(const struct device *dev)
731 {
732         return dev->release == iscsi_session_release;
733 }
734 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
735
736 static 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
746 void 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 }
752 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
753
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  */
762 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
763 {
764         struct iscsi_cls_host *ihost = shost->shost_data;
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 }
771 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
772
773 struct iscsi_scan_data {
774         unsigned int channel;
775         unsigned int id;
776         unsigned int lun;
777 };
778
779 static int iscsi_user_scan_session(struct device *dev, void *data)
780 {
781         struct iscsi_scan_data *scan_data = data;
782         struct iscsi_cls_session *session;
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);
792
793         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
794
795         shost = iscsi_session_to_shost(session);
796         ihost = shost->shost_data;
797
798         mutex_lock(&ihost->mutex);
799         spin_lock_irqsave(&session->lock, flags);
800         if (session->state != ISCSI_SESSION_LOGGED_IN) {
801                 spin_unlock_irqrestore(&session->lock, flags);
802                 goto user_scan_exit;
803         }
804         id = session->target_id;
805         spin_unlock_irqrestore(&session->lock, flags);
806
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         }
815
816 user_scan_exit:
817         mutex_unlock(&ihost->mutex);
818         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
819         return 0;
820 }
821
822 static 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
835 static 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);
839         struct Scsi_Host *shost = iscsi_session_to_shost(session);
840         struct iscsi_cls_host *ihost = shost->shost_data;
841         struct iscsi_scan_data scan_data;
842
843         scan_data.channel = 0;
844         scan_data.id = SCAN_WILD_CARD;
845         scan_data.lun = SCAN_WILD_CARD;
846
847         iscsi_user_scan_session(&session->dev, &scan_data);
848         atomic_dec(&ihost->nr_scans);
849 }
850
851 /**
852  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
853  * @cmd: scsi cmd passed to scsi eh handler
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  */
860 int 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 }
880 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
881
882 static void session_recovery_timedout(struct work_struct *work)
883 {
884         struct iscsi_cls_session *session =
885                 container_of(work, struct iscsi_cls_session,
886                              recovery_work.work);
887         unsigned long flags;
888
889         iscsi_cls_session_printk(KERN_INFO, session,
890                                  "session recovery timed out after %d secs\n",
891                                  session->recovery_tmo);
892
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
906         if (session->transport->session_recovery_timedout)
907                 session->transport->session_recovery_timedout(session);
908
909         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
910         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
911         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
912 }
913
914 static void __iscsi_unblock_session(struct work_struct *work)
915 {
916         struct iscsi_cls_session *session =
917                         container_of(work, struct iscsi_cls_session,
918                                      unblock_work);
919         struct Scsi_Host *shost = iscsi_session_to_shost(session);
920         struct iscsi_cls_host *ihost = shost->shost_data;
921         unsigned long flags;
922
923         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
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);
929         spin_lock_irqsave(&session->lock, flags);
930         session->state = ISCSI_SESSION_LOGGED_IN;
931         spin_unlock_irqrestore(&session->lock, flags);
932         /* start IO */
933         scsi_target_unblock(&session->dev, SDEV_RUNNING);
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) {
940                 if (scsi_queue_work(shost, &session->scan_work))
941                         atomic_inc(&ihost->nr_scans);
942         }
943         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
944 }
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  */
952 void 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 }
961 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
962
963 static void __iscsi_block_session(struct work_struct *work)
964 {
965         struct iscsi_cls_session *session =
966                         container_of(work, struct iscsi_cls_session,
967                                      block_work);
968         unsigned long flags;
969
970         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
971         spin_lock_irqsave(&session->lock, flags);
972         session->state = ISCSI_SESSION_FAILED;
973         spin_unlock_irqrestore(&session->lock, flags);
974         scsi_target_block(&session->dev);
975         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
976         if (session->recovery_tmo >= 0)
977                 queue_delayed_work(iscsi_eh_timer_workq,
978                                    &session->recovery_work,
979                                    session->recovery_tmo * HZ);
980 }
981
982 void iscsi_block_session(struct iscsi_cls_session *session)
983 {
984         queue_work(iscsi_eh_timer_workq, &session->block_work);
985 }
986 EXPORT_SYMBOL_GPL(iscsi_block_session);
987
988 static 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);
994         struct iscsi_cls_host *ihost = shost->shost_data;
995         unsigned long flags;
996         unsigned int target_id;
997
998         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
999
1000         /* Prevent new scans and make sure scanning is not in progress */
1001         mutex_lock(&ihost->mutex);
1002         spin_lock_irqsave(&session->lock, flags);
1003         if (session->target_id == ISCSI_MAX_TARGET) {
1004                 spin_unlock_irqrestore(&session->lock, flags);
1005                 mutex_unlock(&ihost->mutex);
1006                 return;
1007         }
1008
1009         target_id = session->target_id;
1010         session->target_id = ISCSI_MAX_TARGET;
1011         spin_unlock_irqrestore(&session->lock, flags);
1012         mutex_unlock(&ihost->mutex);
1013
1014         if (session->ida_used)
1015                 ida_simple_remove(&iscsi_sess_ida, target_id);
1016
1017         scsi_remove_target(&session->dev);
1018         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1019         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1020 }
1021
1022 struct iscsi_cls_session *
1023 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1024                     int dd_size)
1025 {
1026         struct iscsi_cls_session *session;
1027
1028         session = kzalloc(sizeof(*session) + dd_size,
1029                           GFP_KERNEL);
1030         if (!session)
1031                 return NULL;
1032
1033         session->transport = transport;
1034         session->creator = -1;
1035         session->recovery_tmo = 120;
1036         session->state = ISCSI_SESSION_FREE;
1037         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1038         INIT_LIST_HEAD(&session->sess_list);
1039         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1040         INIT_WORK(&session->block_work, __iscsi_block_session);
1041         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1042         INIT_WORK(&session->scan_work, iscsi_scan_session);
1043         spin_lock_init(&session->lock);
1044
1045         /* this is released in the dev's release function */
1046         scsi_host_get(shost);
1047         session->dev.parent = &shost->shost_gendev;
1048         session->dev.release = iscsi_session_release;
1049         device_initialize(&session->dev);
1050         if (dd_size)
1051                 session->dd_data = &session[1];
1052
1053         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1054         return session;
1055 }
1056 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1057
1058 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1059 {
1060         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1061         struct iscsi_cls_host *ihost;
1062         unsigned long flags;
1063         int id = 0;
1064         int err;
1065
1066         ihost = shost->shost_data;
1067         session->sid = atomic_add_return(1, &iscsi_session_nr);
1068
1069         if (target_id == ISCSI_MAX_TARGET) {
1070                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
1071
1072                 if (id < 0) {
1073                         iscsi_cls_session_printk(KERN_ERR, session,
1074                                         "Failure in Target ID Allocation\n");
1075                         return id;
1076                 }
1077                 session->target_id = (unsigned int)id;
1078                 session->ida_used = true;
1079         } else
1080                 session->target_id = target_id;
1081
1082         dev_set_name(&session->dev, "session%u", session->sid);
1083         err = device_add(&session->dev);
1084         if (err) {
1085                 iscsi_cls_session_printk(KERN_ERR, session,
1086                                          "could not register session's dev\n");
1087                 goto release_ida;
1088         }
1089         transport_register_device(&session->dev);
1090
1091         spin_lock_irqsave(&sesslock, flags);
1092         list_add(&session->sess_list, &sesslist);
1093         spin_unlock_irqrestore(&sesslock, flags);
1094
1095         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1096         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1097         return 0;
1098
1099 release_ida:
1100         if (session->ida_used)
1101                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
1102
1103         return err;
1104 }
1105 EXPORT_SYMBOL_GPL(iscsi_add_session);
1106
1107 /**
1108  * iscsi_create_session - create iscsi class session
1109  * @shost: scsi host
1110  * @transport: iscsi transport
1111  * @dd_size: private driver data size
1112  * @target_id: which target
1113  *
1114  * This can be called from a LLD or iscsi_transport.
1115  */
1116 struct iscsi_cls_session *
1117 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1118                      int dd_size, unsigned int target_id)
1119 {
1120         struct iscsi_cls_session *session;
1121
1122         session = iscsi_alloc_session(shost, transport, dd_size);
1123         if (!session)
1124                 return NULL;
1125
1126         if (iscsi_add_session(session, target_id)) {
1127                 iscsi_free_session(session);
1128                 return NULL;
1129         }
1130         return session;
1131 }
1132 EXPORT_SYMBOL_GPL(iscsi_create_session);
1133
1134 static 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
1139         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1140         kfree(conn);
1141         put_device(parent);
1142 }
1143
1144 static int iscsi_is_conn_dev(const struct device *dev)
1145 {
1146         return dev->release == iscsi_conn_release;
1147 }
1148
1149 static 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
1156 void iscsi_remove_session(struct iscsi_cls_session *session)
1157 {
1158         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1159         unsigned long flags;
1160         int err;
1161
1162         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1163
1164         spin_lock_irqsave(&sesslock, flags);
1165         list_del(&session->sess_list);
1166         spin_unlock_irqrestore(&sesslock, flags);
1167
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);
1173         /*
1174          * If we are blocked let commands flow again. The lld or iscsi
1175          * layer should set up the queuecommand to fail commands.
1176          * We assume that LLD will not be calling block/unblock while
1177          * removing the session.
1178          */
1179         spin_lock_irqsave(&session->lock, flags);
1180         session->state = ISCSI_SESSION_FREE;
1181         spin_unlock_irqrestore(&session->lock, flags);
1182
1183         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1184         /* flush running scans then delete devices */
1185         scsi_flush_work(shost);
1186         __iscsi_unbind_session(&session->unbind_work);
1187
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)
1192                 iscsi_cls_session_printk(KERN_ERR, session,
1193                                          "Could not delete all connections "
1194                                          "for session. Error %d.\n", err);
1195
1196         transport_unregister_device(&session->dev);
1197
1198         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1199         device_del(&session->dev);
1200 }
1201 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1202
1203 void iscsi_free_session(struct iscsi_cls_session *session)
1204 {
1205         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1206         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1207         put_device(&session->dev);
1208 }
1209 EXPORT_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.
1217  */
1218 int iscsi_destroy_session(struct iscsi_cls_session *session)
1219 {
1220         iscsi_remove_session(session);
1221         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1222         iscsi_free_session(session);
1223         return 0;
1224 }
1225 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1226
1227 /**
1228  * iscsi_create_conn - create iscsi class connection
1229  * @session: iscsi cls session
1230  * @dd_size: private driver data size
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.
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.
1241  */
1242 struct iscsi_cls_conn *
1243 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1244 {
1245         struct iscsi_transport *transport = session->transport;
1246         struct iscsi_cls_conn *conn;
1247         unsigned long flags;
1248         int err;
1249
1250         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1251         if (!conn)
1252                 return NULL;
1253         if (dd_size)
1254                 conn->dd_data = &conn[1];
1255
1256         mutex_init(&conn->ep_mutex);
1257         INIT_LIST_HEAD(&conn->conn_list);
1258         conn->transport = transport;
1259         conn->cid = cid;
1260
1261         /* this is released in the dev's release function */
1262         if (!get_device(&session->dev))
1263                 goto free_conn;
1264
1265         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1266         conn->dev.parent = &session->dev;
1267         conn->dev.release = iscsi_conn_release;
1268         err = device_register(&conn->dev);
1269         if (err) {
1270                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1271                                          "register connection's dev\n");
1272                 goto release_parent_ref;
1273         }
1274         transport_register_device(&conn->dev);
1275
1276         spin_lock_irqsave(&connlock, flags);
1277         list_add(&conn->conn_list, &connlist);
1278         spin_unlock_irqrestore(&connlock, flags);
1279
1280         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1281         return conn;
1282
1283 release_parent_ref:
1284         put_device(&session->dev);
1285 free_conn:
1286         kfree(conn);
1287         return NULL;
1288 }
1289
1290 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1291
1292 /**
1293  * iscsi_destroy_conn - destroy iscsi class connection
1294  * @conn: iscsi cls session
1295  *
1296  * This can be called from a LLD or iscsi_transport.
1297  */
1298 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1299 {
1300         unsigned long flags;
1301
1302         spin_lock_irqsave(&connlock, flags);
1303         list_del(&conn->conn_list);
1304         spin_unlock_irqrestore(&connlock, flags);
1305
1306         transport_unregister_device(&conn->dev);
1307         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1308         device_unregister(&conn->dev);
1309         return 0;
1310 }
1311 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1312
1313 /*
1314  * iscsi interface functions
1315  */
1316 static struct iscsi_internal *
1317 iscsi_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 }
1332
1333 static int
1334 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1335 {
1336         return nlmsg_multicast(nls, skb, 0, group, gfp);
1337 }
1338
1339 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1340                    char *data, uint32_t data_size)
1341 {
1342         struct nlmsghdr *nlh;
1343         struct sk_buff *skb;
1344         struct iscsi_uevent *ev;
1345         char *pdu;
1346         struct iscsi_internal *priv;
1347         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1348                               data_size);
1349
1350         priv = iscsi_if_transport_lookup(conn->transport);
1351         if (!priv)
1352                 return -EINVAL;
1353
1354         skb = alloc_skb(len, GFP_ATOMIC);
1355         if (!skb) {
1356                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1357                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1358                                       "control PDU: OOM\n");
1359                 return -ENOMEM;
1360         }
1361
1362         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
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;
1367         ev->r.recv_req.cid = conn->cid;
1368         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1369         pdu = (char*)ev + sizeof(*ev);
1370         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1371         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1372
1373         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1374 }
1375 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1376
1377 int 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
1386         skb = alloc_skb(len, GFP_ATOMIC);
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
1408         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1409 }
1410 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1411
1412 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1413 {
1414         struct nlmsghdr *nlh;
1415         struct sk_buff  *skb;
1416         struct iscsi_uevent *ev;
1417         struct iscsi_internal *priv;
1418         int len = NLMSG_SPACE(sizeof(*ev));
1419
1420         priv = iscsi_if_transport_lookup(conn->transport);
1421         if (!priv)
1422                 return;
1423
1424         skb = alloc_skb(len, GFP_ATOMIC);
1425         if (!skb) {
1426                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1427                                       "conn error (%d)\n", error);
1428                 return;
1429         }
1430
1431         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1432         ev = NLMSG_DATA(nlh);
1433         ev->transport_handle = iscsi_handle(conn->transport);
1434         ev->type = ISCSI_KEVENT_CONN_ERROR;
1435         ev->r.connerror.error = error;
1436         ev->r.connerror.cid = conn->cid;
1437         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1438
1439         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1440
1441         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1442                               error);
1443 }
1444 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1445
1446 void 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 }
1478 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1479
1480 void 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
1489         skb = alloc_skb(len, GFP_NOIO);
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
1507         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
1508 }
1509 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
1510
1511 void 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
1520         skb = alloc_skb(len, GFP_NOIO);
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
1536         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
1537 }
1538 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
1539
1540 static int
1541 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1542                     void *payload, int size)
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
1550         skb = alloc_skb(len, GFP_ATOMIC);
1551         if (!skb) {
1552                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1553                 return -ENOMEM;
1554         }
1555
1556         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1557         nlh->nlmsg_flags = flags;
1558         memcpy(NLMSG_DATA(nlh), payload, size);
1559         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1560 }
1561
1562 static int
1563 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
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;
1571         struct iscsi_internal *priv;
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;
1577
1578         priv = iscsi_if_transport_lookup(transport);
1579         if (!priv)
1580                 return -EINVAL;
1581
1582         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1583         if (!conn)
1584                 return -EEXIST;
1585
1586         do {
1587                 int actual_size;
1588
1589                 skbstat = alloc_skb(len, GFP_ATOMIC);
1590                 if (!skbstat) {
1591                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1592                                               "deliver stats: OOM\n");
1593                         return -ENOMEM;
1594                 }
1595
1596                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
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;
1602                 evstat->u.get_stats.cid =
1603                         ev->u.get_stats.cid;
1604                 evstat->u.get_stats.sid =
1605                         ev->u.get_stats.sid;
1606                 stats = (struct iscsi_stats *)
1607                         ((char*)evstat + sizeof(*evstat));
1608                 memset(stats, 0, sizeof(*stats));
1609
1610                 transport->get_stats(conn, stats);
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);
1617                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1618                 nlhstat->nlmsg_len = actual_size;
1619
1620                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1621                                           GFP_ATOMIC);
1622         } while (err < 0 && err != -ECONNREFUSED);
1623
1624         return err;
1625 }
1626
1627 /**
1628  * iscsi_session_event - send session destr. completion event
1629  * @session: iscsi class session
1630  * @event: type of event
1631  */
1632 int iscsi_session_event(struct iscsi_cls_session *session,
1633                         enum iscsi_uevent_e event)
1634 {
1635         struct iscsi_internal *priv;
1636         struct Scsi_Host *shost;
1637         struct iscsi_uevent *ev;
1638         struct sk_buff  *skb;
1639         struct nlmsghdr *nlh;
1640         int rc, len = NLMSG_SPACE(sizeof(*ev));
1641
1642         priv = iscsi_if_transport_lookup(session->transport);
1643         if (!priv)
1644                 return -EINVAL;
1645         shost = iscsi_session_to_shost(session);
1646
1647         skb = alloc_skb(len, GFP_KERNEL);
1648         if (!skb) {
1649                 iscsi_cls_session_printk(KERN_ERR, session,
1650                                          "Cannot notify userspace of session "
1651                                          "event %u\n", event);
1652                 return -ENOMEM;
1653         }
1654
1655         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1656         ev = NLMSG_DATA(nlh);
1657         ev->transport_handle = iscsi_handle(session->transport);
1658
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:
1674                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1675                                          "%u.\n", event);
1676                 kfree_skb(skb);
1677                 return -EINVAL;
1678         }
1679
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          */
1684         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1685         if (rc == -ESRCH)
1686                 iscsi_cls_session_printk(KERN_ERR, session,
1687                                          "Cannot notify userspace of session "
1688                                          "event %u. Check iscsi daemon\n",
1689                                          event);
1690
1691         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1692                                 event, rc);
1693         return rc;
1694 }
1695 EXPORT_SYMBOL_GPL(iscsi_session_event);
1696
1697 static int
1698 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1699                         struct iscsi_uevent *ev, pid_t pid,
1700                         uint32_t initial_cmdsn, uint16_t cmds_max,
1701                         uint16_t queue_depth)
1702 {
1703         struct iscsi_transport *transport = priv->iscsi_transport;
1704         struct iscsi_cls_session *session;
1705         struct Scsi_Host *shost;
1706
1707         session = transport->create_session(ep, cmds_max, queue_depth,
1708                                             initial_cmdsn);
1709         if (!session)
1710                 return -ENOMEM;
1711
1712         session->creator = pid;
1713         shost = iscsi_session_to_shost(session);
1714         ev->r.c_session_ret.host_no = shost->host_no;
1715         ev->r.c_session_ret.sid = session->sid;
1716         ISCSI_DBG_TRANS_SESSION(session,
1717                                 "Completed creating transport session\n");
1718         return 0;
1719 }
1720
1721 static int
1722 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1723 {
1724         struct iscsi_cls_conn *conn;
1725         struct iscsi_cls_session *session;
1726
1727         session = iscsi_session_lookup(ev->u.c_conn.sid);
1728         if (!session) {
1729                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1730                        ev->u.c_conn.sid);
1731                 return -EINVAL;
1732         }
1733
1734         conn = transport->create_conn(session, ev->u.c_conn.cid);
1735         if (!conn) {
1736                 iscsi_cls_session_printk(KERN_ERR, session,
1737                                          "couldn't create a new connection.");
1738                 return -ENOMEM;
1739         }
1740
1741         ev->r.c_conn_ret.sid = session->sid;
1742         ev->r.c_conn_ret.cid = conn->cid;
1743
1744         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1745         return 0;
1746 }
1747
1748 static int
1749 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1750 {
1751         struct iscsi_cls_conn *conn;
1752
1753         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1754         if (!conn)
1755                 return -EINVAL;
1756
1757         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1758         if (transport->destroy_conn)
1759                 transport->destroy_conn(conn);
1760
1761         return 0;
1762 }
1763
1764 static int
1765 iscsi_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;
1770         int err = 0, value = 0;
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) {
1778         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1779                 sscanf(data, "%d", &value);
1780                 session->recovery_tmo = value;
1781                 break;
1782         default:
1783                 err = transport->set_param(conn, ev->u.set_param.param,
1784                                            data, ev->u.set_param.len);
1785         }
1786
1787         return err;
1788 }
1789
1790 static 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;
1821 release_host:
1822         if (shost)
1823                 scsi_host_put(shost);
1824         return err;
1825 }
1826
1827 static 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
1850 static int
1851 iscsi_if_transport_ep(struct iscsi_transport *transport,
1852                       struct iscsi_uevent *ev, int msg_type)
1853 {
1854         struct iscsi_endpoint *ep;
1855         int rc = 0;
1856
1857         switch (msg_type) {
1858         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1859         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1860                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1861                 break;
1862         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1863                 if (!transport->ep_poll)
1864                         return -EINVAL;
1865
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,
1871                                                    ev->u.ep_poll.timeout_ms);
1872                 break;
1873         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1874                 rc = iscsi_if_ep_disconnect(transport,
1875                                             ev->u.ep_disconnect.ep_handle);
1876                 break;
1877         }
1878         return rc;
1879 }
1880
1881 static int
1882 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1883                 struct iscsi_uevent *ev)
1884 {
1885         struct Scsi_Host *shost;
1886         struct sockaddr *dst_addr;
1887         int err;
1888
1889         if (!transport->tgt_dscvr)
1890                 return -EINVAL;
1891
1892         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1893         if (!shost) {
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
1900         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
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;
1905 }
1906
1907 static int
1908 iscsi_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);
1919         if (!shost) {
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
1931 static int
1932 iscsi_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
1955 static int
1956 iscsi_set_iface_params(struct iscsi_transport *transport,
1957                        struct iscsi_uevent *ev, uint32_t len)
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
1973         err = transport->set_iface_param(shost, data, len);
1974         scsi_host_put(shost);
1975         return err;
1976 }
1977
1978 static int
1979 iscsi_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
2005 static int
2006 iscsi_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
2069 exit_get_chap:
2070         scsi_host_put(shost);
2071         return err;
2072 }
2073
2074 static 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
2095 static int
2096 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
2097 {
2098         int err = 0;
2099         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
2100         struct iscsi_transport *transport = NULL;
2101         struct iscsi_internal *priv;
2102         struct iscsi_cls_session *session;
2103         struct iscsi_cls_conn *conn;
2104         struct iscsi_endpoint *ep = NULL;
2105
2106         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
2107                 *group = ISCSI_NL_GRP_UIP;
2108         else
2109                 *group = ISCSI_NL_GRP_ISCSID;
2110
2111         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
2112         if (!priv)
2113                 return -EINVAL;
2114         transport = priv->iscsi_transport;
2115
2116         if (!try_module_get(transport->owner))
2117                 return -EINVAL;
2118
2119         switch (nlh->nlmsg_type) {
2120         case ISCSI_UEVENT_CREATE_SESSION:
2121                 err = iscsi_if_create_session(priv, ep, ev,
2122                                               NETLINK_CB(skb).pid,
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:
2128                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
2129                 if (!ep) {
2130                         err = -EINVAL;
2131                         break;
2132                 }
2133
2134                 err = iscsi_if_create_session(priv, ep, ev,
2135                                         NETLINK_CB(skb).pid,
2136                                         ev->u.c_bound_session.initial_cmdsn,
2137                                         ev->u.c_bound_session.cmds_max,
2138                                         ev->u.c_bound_session.queue_depth);
2139                 break;
2140         case ISCSI_UEVENT_DESTROY_SESSION:
2141                 session = iscsi_session_lookup(ev->u.d_session.sid);
2142                 if (session)
2143                         transport->destroy_session(session);
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)
2150                         scsi_queue_work(iscsi_session_to_shost(session),
2151                                         &session->unbind_work);
2152                 else
2153                         err = -EINVAL;
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:
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);
2164
2165                 if (conn && conn->ep)
2166                         iscsi_if_ep_disconnect(transport, conn->ep->id);
2167
2168                 if (!session || !conn) {
2169                         err = -EINVAL;
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");
2190                 break;
2191         case ISCSI_UEVENT_SET_PARAM:
2192                 err = iscsi_set_param(transport, ev);
2193                 break;
2194         case ISCSI_UEVENT_START_CONN:
2195                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
2196                 if (conn)
2197                         ev->r.retcode = transport->start_conn(conn);
2198                 else
2199                         err = -EINVAL;
2200                 break;
2201         case ISCSI_UEVENT_STOP_CONN:
2202                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2203                 if (conn)
2204                         transport->stop_conn(conn, ev->u.stop_conn.flag);
2205                 else
2206                         err = -EINVAL;
2207                 break;
2208         case ISCSI_UEVENT_SEND_PDU:
2209                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
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;
2217                 break;
2218         case ISCSI_UEVENT_GET_STATS:
2219                 err = iscsi_if_get_stats(transport, nlh);
2220                 break;
2221         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2222         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2223         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2224         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2225                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2226                 break;
2227         case ISCSI_UEVENT_TGT_DSCVR:
2228                 err = iscsi_tgt_dscvr(transport, ev);
2229                 break;
2230         case ISCSI_UEVENT_SET_HOST_PARAM:
2231                 err = iscsi_set_host_param(transport, ev);
2232                 break;
2233         case ISCSI_UEVENT_PATH_UPDATE:
2234                 err = iscsi_set_path(transport, ev);
2235                 break;
2236         case ISCSI_UEVENT_SET_IFACE_PARAMS:
2237                 err = iscsi_set_iface_params(transport, ev,
2238                                              nlmsg_attrlen(nlh, sizeof(*ev)));
2239                 break;
2240         case ISCSI_UEVENT_PING:
2241                 err = iscsi_send_ping(transport, ev);
2242                 break;
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;
2249         default:
2250                 err = -ENOSYS;
2251                 break;
2252         }
2253
2254         module_put(transport->owner);
2255         return err;
2256 }
2257
2258 /*
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.
2261  */
2262 static void
2263 iscsi_if_rx(struct sk_buff *skb)
2264 {
2265         mutex_lock(&rx_queue_mutex);
2266         while (skb->len >= NLMSG_SPACE(0)) {
2267                 int err;
2268                 uint32_t rlen;
2269                 struct nlmsghdr *nlh;
2270                 struct iscsi_uevent *ev;
2271                 uint32_t group;
2272
2273                 nlh = nlmsg_hdr(skb);
2274                 if (nlh->nlmsg_len < sizeof(*nlh) ||
2275                     skb->len < nlh->nlmsg_len) {
2276                         break;
2277                 }
2278
2279                 ev = NLMSG_DATA(nlh);
2280                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2281                 if (rlen > skb->len)
2282                         rlen = skb->len;
2283
2284                 err = iscsi_if_recv_msg(skb, nlh, &group);
2285                 if (err) {
2286                         ev->type = ISCSI_KEVENT_IF_ERROR;
2287                         ev->iferror = err;
2288                 }
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;
2298                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
2299                                 break;
2300                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
2301                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2302                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
2303                 skb_pull(skb, rlen);
2304         }
2305         mutex_unlock(&rx_queue_mutex);
2306 }
2307
2308 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
2309 struct device_attribute dev_attr_##_prefix##_##_name =  \
2310         __ATTR(_name,_mode,_show,_store)
2311
2312 /*
2313  * iSCSI connection attrs
2314  */
2315 #define iscsi_conn_attr_show(param)                                     \
2316 static ssize_t                                                          \
2317 show_conn_param_##param(struct device *dev,                             \
2318                         struct device_attribute *attr, char *buf)       \
2319 {                                                                       \
2320         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2321         struct iscsi_transport *t = conn->transport;                    \
2322         return t->get_conn_param(conn, param, buf);                     \
2323 }
2324
2325 #define iscsi_conn_attr(field, param)                                   \
2326         iscsi_conn_attr_show(param)                                     \
2327 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
2328                         NULL);
2329
2330 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2331 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2332 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2333 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2334 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2335 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2336 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
2337 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2338 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
2339 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2340 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
2341
2342 #define iscsi_conn_ep_attr_show(param)                                  \
2343 static 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)                                  \
2373 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2374                         show_conn_ep_param_##param, NULL);
2375
2376 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2377 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2378
2379 static 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
2396 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
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
2438 static struct attribute_group iscsi_conn_group = {
2439         .attrs = iscsi_conn_attrs,
2440         .is_visible = iscsi_conn_attr_is_visible,
2441 };
2442
2443 /*
2444  * iSCSI session attrs
2445  */
2446 #define iscsi_session_attr_show(param, perm)                            \
2447 static ssize_t                                                          \
2448 show_session_param_##param(struct device *dev,                          \
2449                            struct device_attribute *attr, char *buf)    \
2450 {                                                                       \
2451         struct iscsi_cls_session *session =                             \
2452                 iscsi_dev_to_session(dev->parent);                      \
2453         struct iscsi_transport *t = session->transport;                 \
2454                                                                         \
2455         if (perm && !capable(CAP_SYS_ADMIN))                            \
2456                 return -EACCES;                                         \
2457         return t->get_session_param(session, param, buf);               \
2458 }
2459
2460 #define iscsi_session_attr(field, param, perm)                          \
2461         iscsi_session_attr_show(param, perm)                            \
2462 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2463                         NULL);
2464 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2465 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2466 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2467 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2468 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2469 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2470 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2471 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2472 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2473 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2474 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2475 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2476 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2477 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2478 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
2479 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
2480 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2481 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2482 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2483 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2484 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2485 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2486 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2487
2488 static ssize_t
2489 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2490                         char *buf)
2491 {
2492         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2493         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2494 }
2495 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2496                         NULL);
2497 static ssize_t
2498 show_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 }
2504 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
2505                         NULL);
2506
2507 #define iscsi_priv_session_attr_show(field, format)                     \
2508 static ssize_t                                                          \
2509 show_priv_session_##field(struct device *dev,                           \
2510                           struct device_attribute *attr, char *buf)     \
2511 {                                                                       \
2512         struct iscsi_cls_session *session =                             \
2513                         iscsi_dev_to_session(dev->parent);              \
2514         if (session->field == -1)                                       \
2515                 return sprintf(buf, "off\n");                           \
2516         return sprintf(buf, format"\n", session->field);                \
2517 }
2518
2519 #define iscsi_priv_session_attr_store(field)                            \
2520 static ssize_t                                                          \
2521 store_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)                       \
2544         iscsi_priv_session_attr_show(field, format)                     \
2545         iscsi_priv_session_attr_store(field)                            \
2546 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2547                         show_priv_session_##field,                      \
2548                         store_priv_session_##field)
2549 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2550
2551 static 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,
2575         &dev_attr_priv_sess_creator.attr,
2576         &dev_attr_sess_chap_out_idx.attr,
2577         &dev_attr_sess_chap_in_idx.attr,
2578         NULL,
2579 };
2580
2581 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
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;
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;
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;
2639         else if (attr == &dev_attr_priv_sess_creator.attr)
2640                 return S_IRUGO;
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
2649 static struct attribute_group iscsi_session_group = {
2650         .attrs = iscsi_session_attrs,
2651         .is_visible = iscsi_session_attr_is_visible,
2652 };
2653
2654 /*
2655  * iSCSI host attrs
2656  */
2657 #define iscsi_host_attr_show(param)                                     \
2658 static ssize_t                                                          \
2659 show_host_param_##param(struct device *dev,                             \
2660                         struct device_attribute *attr, char *buf)       \
2661 {                                                                       \
2662         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
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)                                     \
2669 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2670                         NULL);
2671
2672 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2673 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2674 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2675 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2676 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
2677 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
2678
2679 static 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,
2684         &dev_attr_host_port_state.attr,
2685         &dev_attr_host_port_speed.attr,
2686         NULL,
2687 };
2688
2689 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
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;
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;
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
2717 static struct attribute_group iscsi_host_group = {
2718         .attrs = iscsi_host_attrs,
2719         .is_visible = iscsi_host_attr_is_visible,
2720 };
2721
2722 /* convert iscsi_port_speed values to ascii string name */
2723 static 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
2734 char *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 }
2749 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
2750
2751 /* convert iscsi_port_state values to ascii string name */
2752 static 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
2760 char *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 }
2775 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
2776
2777 static int iscsi_session_match(struct attribute_container *cont,
2778                            struct device *dev)
2779 {
2780         struct iscsi_cls_session *session;
2781         struct Scsi_Host *shost;
2782         struct iscsi_internal *priv;
2783
2784         if (!iscsi_is_session_dev(dev))
2785                 return 0;
2786
2787         session = iscsi_dev_to_session(dev);
2788         shost = iscsi_session_to_shost(session);
2789         if (!shost->transportt)
2790                 return 0;
2791
2792         priv = to_iscsi_internal(shost->transportt);
2793         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2794                 return 0;
2795
2796         return &priv->session_cont.ac == cont;
2797 }
2798
2799 static int iscsi_conn_match(struct attribute_container *cont,
2800                            struct device *dev)
2801 {
2802         struct iscsi_cls_session *session;
2803         struct iscsi_cls_conn *conn;
2804         struct Scsi_Host *shost;
2805         struct iscsi_internal *priv;
2806
2807         if (!iscsi_is_conn_dev(dev))
2808                 return 0;
2809
2810         conn = iscsi_dev_to_conn(dev);
2811         session = iscsi_dev_to_session(conn->dev.parent);
2812         shost = iscsi_session_to_shost(session);
2813
2814         if (!shost->transportt)
2815                 return 0;
2816
2817         priv = to_iscsi_internal(shost->transportt);
2818         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2819                 return 0;
2820
2821         return &priv->conn_cont.ac == cont;
2822 }
2823
2824 static 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
2842 struct scsi_transport_template *
2843 iscsi_register_transport(struct iscsi_transport *tt)
2844 {
2845         struct iscsi_internal *priv;
2846         unsigned long flags;
2847         int err;
2848
2849         BUG_ON(!tt);
2850
2851         priv = iscsi_if_transport_lookup(tt);
2852         if (priv)
2853                 return NULL;
2854
2855         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2856         if (!priv)
2857                 return NULL;
2858         INIT_LIST_HEAD(&priv->list);
2859         priv->iscsi_transport = tt;
2860         priv->t.user_scan = iscsi_user_scan;
2861         priv->t.create_work_queue = 1;
2862
2863         priv->dev.class = &iscsi_transport_class;
2864         dev_set_name(&priv->dev, "%s", tt->name);
2865         err = device_register(&priv->dev);
2866         if (err)
2867                 goto free_priv;
2868
2869         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2870         if (err)
2871                 goto unregister_dev;
2872
2873         /* host parameters */
2874         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2875         priv->t.host_attrs.ac.match = iscsi_host_match;
2876         priv->t.host_attrs.ac.grp = &iscsi_host_group;
2877         priv->t.host_size = sizeof(struct iscsi_cls_host);
2878         transport_container_register(&priv->t.host_attrs);
2879
2880         /* connection parameters */
2881         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2882         priv->conn_cont.ac.match = iscsi_conn_match;
2883         priv->conn_cont.ac.grp = &iscsi_conn_group;
2884         transport_container_register(&priv->conn_cont);
2885
2886         /* session parameters */
2887         priv->session_cont.ac.class = &iscsi_session_class.class;
2888         priv->session_cont.ac.match = iscsi_session_match;
2889         priv->session_cont.ac.grp = &iscsi_session_group;
2890         transport_container_register(&priv->session_cont);
2891
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);
2897         return &priv->t;
2898
2899 unregister_dev:
2900         device_unregister(&priv->dev);
2901         return NULL;
2902 free_priv:
2903         kfree(priv);
2904         return NULL;
2905 }
2906 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2907
2908 int iscsi_unregister_transport(struct iscsi_transport *tt)
2909 {
2910         struct iscsi_internal *priv;
2911         unsigned long flags;
2912
2913         BUG_ON(!tt);
2914
2915         mutex_lock(&rx_queue_mutex);
2916
2917         priv = iscsi_if_transport_lookup(tt);
2918         BUG_ON (!priv);
2919
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);
2926         transport_container_unregister(&priv->t.host_attrs);
2927
2928         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2929         device_unregister(&priv->dev);
2930         mutex_unlock(&rx_queue_mutex);
2931
2932         return 0;
2933 }
2934 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2935
2936 static __init int iscsi_transport_init(void)
2937 {
2938         int err;
2939         struct netlink_kernel_cfg cfg = {
2940                 .groups = 1,
2941                 .input  = iscsi_if_rx,
2942         };
2943         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2944                 ISCSI_TRANSPORT_VERSION);
2945
2946         atomic_set(&iscsi_session_nr, 0);
2947
2948         err = class_register(&iscsi_transport_class);
2949         if (err)
2950                 return err;
2951
2952         err = class_register(&iscsi_endpoint_class);
2953         if (err)
2954                 goto unregister_transport_class;
2955
2956         err = class_register(&iscsi_iface_class);
2957         if (err)
2958                 goto unregister_endpoint_class;
2959
2960         err = transport_class_register(&iscsi_host_class);
2961         if (err)
2962                 goto unregister_iface_class;
2963
2964         err = transport_class_register(&iscsi_connection_class);
2965         if (err)
2966                 goto unregister_host_class;
2967
2968         err = transport_class_register(&iscsi_session_class);
2969         if (err)
2970                 goto unregister_conn_class;
2971
2972         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI,
2973                                     THIS_MODULE, &cfg);
2974         if (!nls) {
2975                 err = -ENOBUFS;
2976                 goto unregister_session_class;
2977         }
2978
2979         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2980         if (!iscsi_eh_timer_workq)
2981                 goto release_nls;
2982
2983         return 0;
2984
2985 release_nls:
2986         netlink_kernel_release(nls);
2987 unregister_session_class:
2988         transport_class_unregister(&iscsi_session_class);
2989 unregister_conn_class:
2990         transport_class_unregister(&iscsi_connection_class);
2991 unregister_host_class:
2992         transport_class_unregister(&iscsi_host_class);
2993 unregister_iface_class:
2994         class_unregister(&iscsi_iface_class);
2995 unregister_endpoint_class:
2996         class_unregister(&iscsi_endpoint_class);
2997 unregister_transport_class:
2998         class_unregister(&iscsi_transport_class);
2999         return err;
3000 }
3001
3002 static void __exit iscsi_transport_exit(void)
3003 {
3004         destroy_workqueue(iscsi_eh_timer_workq);
3005         netlink_kernel_release(nls);
3006         transport_class_unregister(&iscsi_connection_class);
3007         transport_class_unregister(&iscsi_session_class);
3008         transport_class_unregister(&iscsi_host_class);
3009         class_unregister(&iscsi_endpoint_class);
3010         class_unregister(&iscsi_iface_class);
3011         class_unregister(&iscsi_transport_class);
3012 }
3013
3014 module_init(iscsi_transport_init);
3015 module_exit(iscsi_transport_exit);
3016
3017 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
3018               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
3019               "Alex Aizman <itn780@yahoo.com>");
3020 MODULE_DESCRIPTION("iSCSI Transport Interface");
3021 MODULE_LICENSE("GPL");
3022 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
3023 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);