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