Pileus Git - ~andy/linux/blob - 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 <net/tcp.h>
  27 #include <scsi/scsi.h>
  28 #include <scsi/scsi_host.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_transport.h>
  31 #include <scsi/scsi_transport_iscsi.h>
  32 #include <scsi/iscsi_if.h>
  33 #include <scsi/scsi_cmnd.h>
  34
  35 #define ISCSI_SESSION_ATTRS 23
  36 #define ISCSI_CONN_ATTRS 13
  37 #define ISCSI_HOST_ATTRS 4
  38
  39 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63         } while (0);
  64
  65 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  66         do {                                                            \
  67                 if (dbg_conn)                                           \
  68                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  69                                               "%s: " dbg_fmt,           \
  70                                               __func__, ##arg); \
  71         } while (0);
  72
  73 struct iscsi_internal {
  74         struct scsi_transport_template t;
  75         struct iscsi_transport *iscsi_transport;
  76         struct list_head list;
  77         struct device dev;
  78
  79         struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
  80         struct transport_container conn_cont;
  81         struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
  82         struct transport_container session_cont;
  83         struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
  84 };
  85
  86 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  87 static struct workqueue_struct *iscsi_eh_timer_workq;
  88
  89 /*
  90  * list of registered transports and lock that must
  91  * be held while accessing list. The iscsi_transport_lock must
  92  * be acquired after the rx_queue_mutex.
  93  */
  94 static LIST_HEAD(iscsi_transports);
  95 static DEFINE_SPINLOCK(iscsi_transport_lock);
  96
  97 #define to_iscsi_internal(tmpl) \
  98         container_of(tmpl, struct iscsi_internal, t)
  99
 100 #define dev_to_iscsi_internal(_dev) \
 101         container_of(_dev, struct iscsi_internal, dev)
 102
 103 static void iscsi_transport_release(struct device *dev)
 104 {
 105         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 106         kfree(priv);
 107 }
 108
 109 /*
 110  * iscsi_transport_class represents the iscsi_transports that are
 111  * registered.
 112  */
 113 static struct class iscsi_transport_class = {
 114         .name = "iscsi_transport",
 115         .dev_release = iscsi_transport_release,
 116 };
 117
 118 static ssize_t
 119 show_transport_handle(struct device *dev, struct device_attribute *attr,
 120                       char *buf)
 121 {
 122         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 123         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 124 }
 125 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 126
 127 #define show_transport_attr(name, format)                               \
 128 static ssize_t                                                          \
 129 show_transport_##name(struct device *dev,                               \
 130                       struct device_attribute *attr,char *buf)          \
 131 {                                                                       \
 132         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 133         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 134 }                                                                       \
 135 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 136
 137 show_transport_attr(caps, "0x%x");
 138
 139 static struct attribute *iscsi_transport_attrs[] = {
 140         &dev_attr_handle.attr,
 141         &dev_attr_caps.attr,
 142         NULL,
 143 };
 144
 145 static struct attribute_group iscsi_transport_group = {
 146         .attrs = iscsi_transport_attrs,
 147 };
 148
 149 /*
 150  * iSCSI endpoint attrs
 151  */
 152 #define iscsi_dev_to_endpoint(_dev) \
 153         container_of(_dev, struct iscsi_endpoint, dev)
 154
 155 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 156 struct device_attribute dev_attr_##_prefix##_##_name =  \
 157         __ATTR(_name,_mode,_show,_store)
 158
 159 static void iscsi_endpoint_release(struct device *dev)
 160 {
 161         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 162         kfree(ep);
 163 }
 164
 165 static struct class iscsi_endpoint_class = {
 166         .name = "iscsi_endpoint",
 167         .dev_release = iscsi_endpoint_release,
 168 };
 169
 170 static ssize_t
 171 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 172 {
 173         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 174         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 175 }
 176 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 177
 178 static struct attribute *iscsi_endpoint_attrs[] = {
 179         &dev_attr_ep_handle.attr,
 180         NULL,
 181 };
 182
 183 static struct attribute_group iscsi_endpoint_group = {
 184         .attrs = iscsi_endpoint_attrs,
 185 };
 186
 187 #define ISCSI_MAX_EPID -1
 188
 189 static int iscsi_match_epid(struct device *dev, void *data)
 190 {
 191         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 192         uint64_t *epid = (uint64_t *) data;
 193
 194         return *epid == ep->id;
 195 }
 196
 197 struct iscsi_endpoint *
 198 iscsi_create_endpoint(int dd_size)
 199 {
 200         struct device *dev;
 201         struct iscsi_endpoint *ep;
 202         uint64_t id;
 203         int err;
 204
 205         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 206                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 207                                         iscsi_match_epid);
 208                 if (!dev)
 209                         break;
 210         }
 211         if (id == ISCSI_MAX_EPID) {
 212                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 213                        ISCSI_MAX_EPID - 1);
 214                 return NULL;
 215         }
 216
 217         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 218         if (!ep)
 219                 return NULL;
 220
 221         ep->id = id;
 222         ep->dev.class = &iscsi_endpoint_class;
 223         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 224         err = device_register(&ep->dev);
 225         if (err)
 226                 goto free_ep;
 227
 228         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 229         if (err)
 230                 goto unregister_dev;
 231
 232         if (dd_size)
 233                 ep->dd_data = &ep[1];
 234         return ep;
 235
 236 unregister_dev:
 237         device_unregister(&ep->dev);
 238         return NULL;
 239
 240 free_ep:
 241         kfree(ep);
 242         return NULL;
 243 }
 244 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 245
 246 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 247 {
 248         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 249         device_unregister(&ep->dev);
 250 }
 251 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 252
 253 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 254 {
 255         struct iscsi_endpoint *ep;
 256         struct device *dev;
 257
 258         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 259                                 iscsi_match_epid);
 260         if (!dev)
 261                 return NULL;
 262
 263         ep = iscsi_dev_to_endpoint(dev);
 264         /*
 265          * we can drop this now because the interface will prevent
 266          * removals and lookups from racing.
 267          */
 268         put_device(dev);
 269         return ep;
 270 }
 271 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 272
 273 /*
 274  * Interface to display network param to sysfs
 275  */
 276
 277 static void iscsi_iface_release(struct device *dev)
 278 {
 279         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 280         struct device *parent = iface->dev.parent;
 281
 282         kfree(iface);
 283         put_device(parent);
 284 }
 285
 286
 287 static struct class iscsi_iface_class = {
 288         .name = "iscsi_iface",
 289         .dev_release = iscsi_iface_release,
 290 };
 291
 292 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 293 struct device_attribute dev_attr_##_prefix##_##_name =          \
 294         __ATTR(_name, _mode, _show, _store)
 295
 296 /* iface attrs show */
 297 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 298 static ssize_t                                                          \
 299 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 300                      char *buf)                                         \
 301 {                                                                       \
 302         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 303         struct iscsi_transport *t = iface->transport;                   \
 304         return t->get_iface_param(iface, param_type, param, buf);       \
 305 }                                                                       \
 306
 307 #define iscsi_iface_net_attr(type, name, param)                         \
 308         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 309 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 310
 311 /* generic read only ipvi4 attribute */
 312 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 313 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 314 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 315 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 316
 317 /* generic read only ipv6 attribute */
 318 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 319 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 320 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 321 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 322                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 323 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
 324                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 325
 326 /* common read only iface attribute */
 327 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 328 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
 329
 330 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 331                                           struct attribute *attr, int i)
 332 {
 333         struct device *dev = container_of(kobj, struct device, kobj);
 334         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 335         struct iscsi_transport *t = iface->transport;
 336
 337         if (attr == &dev_attr_iface_enabled.attr)
 338                 return (t->iface_param_mask & ISCSI_NET_IFACE_ENABLE) ?
 339                                                                 S_IRUGO : 0;
 340         else if (attr == &dev_attr_iface_vlan.attr)
 341                 return (t->iface_param_mask & ISCSI_NET_VLAN_ID) ? S_IRUGO : 0;
 342
 343         if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 344                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 345                         return (t->iface_param_mask & ISCSI_NET_IPV4_ADDR) ?
 346                                                                 S_IRUGO : 0;
 347                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 348                         return (t->iface_param_mask & ISCSI_NET_IPV4_GW) ?
 349                                                                 S_IRUGO : 0;
 350                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 351                         return (t->iface_param_mask & ISCSI_NET_IPV4_SUBNET) ?
 352                                                                 S_IRUGO : 0;
 353                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 354                         return (t->iface_param_mask & ISCSI_NET_IPV4_BOOTPROTO) ?
 355                                                                  S_IRUGO : 0;
 356         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 357                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 358                         return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR) ?
 359                                                                 S_IRUGO : 0;
 360                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 361                         return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL) ?
 362                                                                 S_IRUGO : 0;
 363                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 364                         return (t->iface_param_mask & ISCSI_NET_IPV6_ROUTER) ?
 365                                                                 S_IRUGO : 0;
 366                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 367                         return (t->iface_param_mask & ISCSI_NET_IPV6_ADDR_AUTOCFG) ?
 368                                                                 S_IRUGO : 0;
 369                 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
 370                         return (t->iface_param_mask & ISCSI_NET_IPV6_LINKLOCAL_AUTOCFG) ?
 371                                                                 S_IRUGO : 0;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static struct attribute *iscsi_iface_attrs[] = {
 378         &dev_attr_iface_enabled.attr,
 379         &dev_attr_iface_vlan.attr,
 380         &dev_attr_ipv4_iface_ipaddress.attr,
 381         &dev_attr_ipv4_iface_gateway.attr,
 382         &dev_attr_ipv4_iface_subnet.attr,
 383         &dev_attr_ipv4_iface_bootproto.attr,
 384         &dev_attr_ipv6_iface_ipaddress.attr,
 385         &dev_attr_ipv6_iface_link_local_addr.attr,
 386         &dev_attr_ipv6_iface_router_addr.attr,
 387         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 388         &dev_attr_ipv6_iface_linklocal_autocfg.attr,
 389         NULL,
 390 };
 391
 392 static struct attribute_group iscsi_iface_group = {
 393         .attrs = iscsi_iface_attrs,
 394         .is_visible = iscsi_iface_attr_is_visible,
 395 };
 396
 397 struct iscsi_iface *
 398 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 399                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 400 {
 401         struct iscsi_iface *iface;
 402         int err;
 403
 404         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 405         if (!iface)
 406                 return NULL;
 407
 408         iface->transport = transport;
 409         iface->iface_type = iface_type;
 410         iface->iface_num = iface_num;
 411         iface->dev.release = iscsi_iface_release;
 412         iface->dev.class = &iscsi_iface_class;
 413         /* parent reference released in iscsi_iface_release */
 414         iface->dev.parent = get_device(&shost->shost_gendev);
 415         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 416                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 417                              iface_num);
 418         else
 419                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 420                              iface_num);
 421
 422         err = device_register(&iface->dev);
 423         if (err)
 424                 goto free_iface;
 425
 426         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 427         if (err)
 428                 goto unreg_iface;
 429
 430         if (dd_size)
 431                 iface->dd_data = &iface[1];
 432         return iface;
 433
 434 unreg_iface:
 435         device_unregister(&iface->dev);
 436         return NULL;
 437
 438 free_iface:
 439         put_device(iface->dev.parent);
 440         kfree(iface);
 441         return NULL;
 442 }
 443 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 444
 445 void iscsi_destroy_iface(struct iscsi_iface *iface)
 446 {
 447         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 448         device_unregister(&iface->dev);
 449 }
 450 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 451
 452 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 453                             struct device *cdev)
 454 {
 455         struct Scsi_Host *shost = dev_to_shost(dev);
 456         struct iscsi_cls_host *ihost = shost->shost_data;
 457
 458         memset(ihost, 0, sizeof(*ihost));
 459         atomic_set(&ihost->nr_scans, 0);
 460         mutex_init(&ihost->mutex);
 461         return 0;
 462 }
 463
 464 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 465                                "iscsi_host",
 466                                iscsi_setup_host,
 467                                NULL,
 468                                NULL);
 469
 470 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 471                                "iscsi_session",
 472                                NULL,
 473                                NULL,
 474                                NULL);
 475
 476 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 477                                "iscsi_connection",
 478                                NULL,
 479                                NULL,
 480                                NULL);
 481
 482 static struct sock *nls;
 483 static DEFINE_MUTEX(rx_queue_mutex);
 484
 485 static LIST_HEAD(sesslist);
 486 static DEFINE_SPINLOCK(sesslock);
 487 static LIST_HEAD(connlist);
 488 static DEFINE_SPINLOCK(connlock);
 489
 490 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 491 {
 492         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 493         return sess->sid;
 494 }
 495
 496 /*
 497  * Returns the matching session to a given sid
 498  */
 499 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 500 {
 501         unsigned long flags;
 502         struct iscsi_cls_session *sess;
 503
 504         spin_lock_irqsave(&sesslock, flags);
 505         list_for_each_entry(sess, &sesslist, sess_list) {
 506                 if (sess->sid == sid) {
 507                         spin_unlock_irqrestore(&sesslock, flags);
 508                         return sess;
 509                 }
 510         }
 511         spin_unlock_irqrestore(&sesslock, flags);
 512         return NULL;
 513 }
 514
 515 /*
 516  * Returns the matching connection to a given sid / cid tuple
 517  */
 518 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 519 {
 520         unsigned long flags;
 521         struct iscsi_cls_conn *conn;
 522
 523         spin_lock_irqsave(&connlock, flags);
 524         list_for_each_entry(conn, &connlist, conn_list) {
 525                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 526                         spin_unlock_irqrestore(&connlock, flags);
 527                         return conn;
 528                 }
 529         }
 530         spin_unlock_irqrestore(&connlock, flags);
 531         return NULL;
 532 }
 533
 534 /*
 535  * The following functions can be used by LLDs that allocate
 536  * their own scsi_hosts or by software iscsi LLDs
 537  */
 538 static struct {
 539         int value;
 540         char *name;
 541 } iscsi_session_state_names[] = {
 542         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 543         { ISCSI_SESSION_FAILED,         "FAILED" },
 544         { ISCSI_SESSION_FREE,           "FREE" },
 545 };
 546
 547 static const char *iscsi_session_state_name(int state)
 548 {
 549         int i;
 550         char *name = NULL;
 551
 552         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 553                 if (iscsi_session_state_names[i].value == state) {
 554                         name = iscsi_session_state_names[i].name;
 555                         break;
 556                 }
 557         }
 558         return name;
 559 }
 560
 561 int iscsi_session_chkready(struct iscsi_cls_session *session)
 562 {
 563         unsigned long flags;
 564         int err;
 565
 566         spin_lock_irqsave(&session->lock, flags);
 567         switch (session->state) {
 568         case ISCSI_SESSION_LOGGED_IN:
 569                 err = 0;
 570                 break;
 571         case ISCSI_SESSION_FAILED:
 572                 err = DID_IMM_RETRY << 16;
 573                 break;
 574         case ISCSI_SESSION_FREE:
 575                 err = DID_TRANSPORT_FAILFAST << 16;
 576                 break;
 577         default:
 578                 err = DID_NO_CONNECT << 16;
 579                 break;
 580         }
 581         spin_unlock_irqrestore(&session->lock, flags);
 582         return err;
 583 }
 584 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 585
 586 static void iscsi_session_release(struct device *dev)
 587 {
 588         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 589         struct Scsi_Host *shost;
 590
 591         shost = iscsi_session_to_shost(session);
 592         scsi_host_put(shost);
 593         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 594         kfree(session);
 595 }
 596
 597 static int iscsi_is_session_dev(const struct device *dev)
 598 {
 599         return dev->release == iscsi_session_release;
 600 }
 601
 602 static int iscsi_iter_session_fn(struct device *dev, void *data)
 603 {
 604         void (* fn) (struct iscsi_cls_session *) = data;
 605
 606         if (!iscsi_is_session_dev(dev))
 607                 return 0;
 608         fn(iscsi_dev_to_session(dev));
 609         return 0;
 610 }
 611
 612 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 613                                  void (*fn)(struct iscsi_cls_session *))
 614 {
 615         device_for_each_child(&shost->shost_gendev, fn,
 616                               iscsi_iter_session_fn);
 617 }
 618 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 619
 620 /**
 621  * iscsi_scan_finished - helper to report when running scans are done
 622  * @shost: scsi host
 623  * @time: scan run time
 624  *
 625  * This function can be used by drives like qla4xxx to report to the scsi
 626  * layer when the scans it kicked off at module load time are done.
 627  */
 628 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 629 {
 630         struct iscsi_cls_host *ihost = shost->shost_data;
 631         /*
 632          * qla4xxx will have kicked off some session unblocks before calling
 633          * scsi_scan_host, so just wait for them to complete.
 634          */
 635         return !atomic_read(&ihost->nr_scans);
 636 }
 637 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 638
 639 struct iscsi_scan_data {
 640         unsigned int channel;
 641         unsigned int id;
 642         unsigned int lun;
 643 };
 644
 645 static int iscsi_user_scan_session(struct device *dev, void *data)
 646 {
 647         struct iscsi_scan_data *scan_data = data;
 648         struct iscsi_cls_session *session;
 649         struct Scsi_Host *shost;
 650         struct iscsi_cls_host *ihost;
 651         unsigned long flags;
 652         unsigned int id;
 653
 654         if (!iscsi_is_session_dev(dev))
 655                 return 0;
 656
 657         session = iscsi_dev_to_session(dev);
 658
 659         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 660
 661         shost = iscsi_session_to_shost(session);
 662         ihost = shost->shost_data;
 663
 664         mutex_lock(&ihost->mutex);
 665         spin_lock_irqsave(&session->lock, flags);
 666         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 667                 spin_unlock_irqrestore(&session->lock, flags);
 668                 goto user_scan_exit;
 669         }
 670         id = session->target_id;
 671         spin_unlock_irqrestore(&session->lock, flags);
 672
 673         if (id != ISCSI_MAX_TARGET) {
 674                 if ((scan_data->channel == SCAN_WILD_CARD ||
 675                      scan_data->channel == 0) &&
 676                     (scan_data->id == SCAN_WILD_CARD ||
 677                      scan_data->id == id))
 678                         scsi_scan_target(&session->dev, 0, id,
 679                                          scan_data->lun, 1);
 680         }
 681
 682 user_scan_exit:
 683         mutex_unlock(&ihost->mutex);
 684         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 685         return 0;
 686 }
 687
 688 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 689                            uint id, uint lun)
 690 {
 691         struct iscsi_scan_data scan_data;
 692
 693         scan_data.channel = channel;
 694         scan_data.id = id;
 695         scan_data.lun = lun;
 696
 697         return device_for_each_child(&shost->shost_gendev, &scan_data,
 698                                      iscsi_user_scan_session);
 699 }
 700
 701 static void iscsi_scan_session(struct work_struct *work)
 702 {
 703         struct iscsi_cls_session *session =
 704                         container_of(work, struct iscsi_cls_session, scan_work);
 705         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 706         struct iscsi_cls_host *ihost = shost->shost_data;
 707         struct iscsi_scan_data scan_data;
 708
 709         scan_data.channel = 0;
 710         scan_data.id = SCAN_WILD_CARD;
 711         scan_data.lun = SCAN_WILD_CARD;
 712
 713         iscsi_user_scan_session(&session->dev, &scan_data);
 714         atomic_dec(&ihost->nr_scans);
 715 }
 716
 717 /**
 718  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 719  * @cmd: scsi cmd passed to scsi eh handler
 720  *
 721  * If the session is down this function will wait for the recovery
 722  * timer to fire or for the session to be logged back in. If the
 723  * recovery timer fires then FAST_IO_FAIL is returned. The caller
 724  * should pass this error value to the scsi eh.
 725  */
 726 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 727 {
 728         struct iscsi_cls_session *session =
 729                         starget_to_session(scsi_target(cmd->device));
 730         unsigned long flags;
 731         int ret = 0;
 732
 733         spin_lock_irqsave(&session->lock, flags);
 734         while (session->state != ISCSI_SESSION_LOGGED_IN) {
 735                 if (session->state == ISCSI_SESSION_FREE) {
 736                         ret = FAST_IO_FAIL;
 737                         break;
 738                 }
 739                 spin_unlock_irqrestore(&session->lock, flags);
 740                 msleep(1000);
 741                 spin_lock_irqsave(&session->lock, flags);
 742         }
 743         spin_unlock_irqrestore(&session->lock, flags);
 744         return ret;
 745 }
 746 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 747
 748 static void session_recovery_timedout(struct work_struct *work)
 749 {
 750         struct iscsi_cls_session *session =
 751                 container_of(work, struct iscsi_cls_session,
 752                              recovery_work.work);
 753         unsigned long flags;
 754
 755         iscsi_cls_session_printk(KERN_INFO, session,
 756                                  "session recovery timed out after %d secs\n",
 757                                  session->recovery_tmo);
 758
 759         spin_lock_irqsave(&session->lock, flags);
 760         switch (session->state) {
 761         case ISCSI_SESSION_FAILED:
 762                 session->state = ISCSI_SESSION_FREE;
 763                 break;
 764         case ISCSI_SESSION_LOGGED_IN:
 765         case ISCSI_SESSION_FREE:
 766                 /* we raced with the unblock's flush */
 767                 spin_unlock_irqrestore(&session->lock, flags);
 768                 return;
 769         }
 770         spin_unlock_irqrestore(&session->lock, flags);
 771
 772         if (session->transport->session_recovery_timedout)
 773                 session->transport->session_recovery_timedout(session);
 774
 775         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 776         scsi_target_unblock(&session->dev);
 777         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 778 }
 779
 780 static void __iscsi_unblock_session(struct work_struct *work)
 781 {
 782         struct iscsi_cls_session *session =
 783                         container_of(work, struct iscsi_cls_session,
 784                                      unblock_work);
 785         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 786         struct iscsi_cls_host *ihost = shost->shost_data;
 787         unsigned long flags;
 788
 789         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 790         /*
 791          * The recovery and unblock work get run from the same workqueue,
 792          * so try to cancel it if it was going to run after this unblock.
 793          */
 794         cancel_delayed_work(&session->recovery_work);
 795         spin_lock_irqsave(&session->lock, flags);
 796         session->state = ISCSI_SESSION_LOGGED_IN;
 797         spin_unlock_irqrestore(&session->lock, flags);
 798         /* start IO */
 799         scsi_target_unblock(&session->dev);
 800         /*
 801          * Only do kernel scanning if the driver is properly hooked into
 802          * the async scanning code (drivers like iscsi_tcp do login and
 803          * scanning from userspace).
 804          */
 805         if (shost->hostt->scan_finished) {
 806                 if (scsi_queue_work(shost, &session->scan_work))
 807                         atomic_inc(&ihost->nr_scans);
 808         }
 809         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 810 }
 811
 812 /**
 813  * iscsi_unblock_session - set a session as logged in and start IO.
 814  * @session: iscsi session
 815  *
 816  * Mark a session as ready to accept IO.
 817  */
 818 void iscsi_unblock_session(struct iscsi_cls_session *session)
 819 {
 820         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 821         /*
 822          * make sure all the events have completed before tell the driver
 823          * it is safe
 824          */
 825         flush_workqueue(iscsi_eh_timer_workq);
 826 }
 827 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 828
 829 static void __iscsi_block_session(struct work_struct *work)
 830 {
 831         struct iscsi_cls_session *session =
 832                         container_of(work, struct iscsi_cls_session,
 833                                      block_work);
 834         unsigned long flags;
 835
 836         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 837         spin_lock_irqsave(&session->lock, flags);
 838         session->state = ISCSI_SESSION_FAILED;
 839         spin_unlock_irqrestore(&session->lock, flags);
 840         scsi_target_block(&session->dev);
 841         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 842         if (session->recovery_tmo >= 0)
 843                 queue_delayed_work(iscsi_eh_timer_workq,
 844                                    &session->recovery_work,
 845                                    session->recovery_tmo * HZ);
 846 }
 847
 848 void iscsi_block_session(struct iscsi_cls_session *session)
 849 {
 850         queue_work(iscsi_eh_timer_workq, &session->block_work);
 851 }
 852 EXPORT_SYMBOL_GPL(iscsi_block_session);
 853
 854 static void __iscsi_unbind_session(struct work_struct *work)
 855 {
 856         struct iscsi_cls_session *session =
 857                         container_of(work, struct iscsi_cls_session,
 858                                      unbind_work);
 859         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 860         struct iscsi_cls_host *ihost = shost->shost_data;
 861         unsigned long flags;
 862
 863         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 864
 865         /* Prevent new scans and make sure scanning is not in progress */
 866         mutex_lock(&ihost->mutex);
 867         spin_lock_irqsave(&session->lock, flags);
 868         if (session->target_id == ISCSI_MAX_TARGET) {
 869                 spin_unlock_irqrestore(&session->lock, flags);
 870                 mutex_unlock(&ihost->mutex);
 871                 return;
 872         }
 873         session->target_id = ISCSI_MAX_TARGET;
 874         spin_unlock_irqrestore(&session->lock, flags);
 875         mutex_unlock(&ihost->mutex);
 876
 877         scsi_remove_target(&session->dev);
 878         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
 879         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
 880 }
 881
 882 struct iscsi_cls_session *
 883 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 884                     int dd_size)
 885 {
 886         struct iscsi_cls_session *session;
 887
 888         session = kzalloc(sizeof(*session) + dd_size,
 889                           GFP_KERNEL);
 890         if (!session)
 891                 return NULL;
 892
 893         session->transport = transport;
 894         session->recovery_tmo = 120;
 895         session->state = ISCSI_SESSION_FREE;
 896         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
 897         INIT_LIST_HEAD(&session->sess_list);
 898         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
 899         INIT_WORK(&session->block_work, __iscsi_block_session);
 900         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
 901         INIT_WORK(&session->scan_work, iscsi_scan_session);
 902         spin_lock_init(&session->lock);
 903
 904         /* this is released in the dev's release function */
 905         scsi_host_get(shost);
 906         session->dev.parent = &shost->shost_gendev;
 907         session->dev.release = iscsi_session_release;
 908         device_initialize(&session->dev);
 909         if (dd_size)
 910                 session->dd_data = &session[1];
 911
 912         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
 913         return session;
 914 }
 915 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 916
 917 static int iscsi_get_next_target_id(struct device *dev, void *data)
 918 {
 919         struct iscsi_cls_session *session;
 920         unsigned long flags;
 921         int err = 0;
 922
 923         if (!iscsi_is_session_dev(dev))
 924                 return 0;
 925
 926         session = iscsi_dev_to_session(dev);
 927         spin_lock_irqsave(&session->lock, flags);
 928         if (*((unsigned int *) data) == session->target_id)
 929                 err = -EEXIST;
 930         spin_unlock_irqrestore(&session->lock, flags);
 931         return err;
 932 }
 933
 934 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 935 {
 936         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 937         struct iscsi_cls_host *ihost;
 938         unsigned long flags;
 939         unsigned int id = target_id;
 940         int err;
 941
 942         ihost = shost->shost_data;
 943         session->sid = atomic_add_return(1, &iscsi_session_nr);
 944
 945         if (id == ISCSI_MAX_TARGET) {
 946                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
 947                         err = device_for_each_child(&shost->shost_gendev, &id,
 948                                                     iscsi_get_next_target_id);
 949                         if (!err)
 950                                 break;
 951                 }
 952
 953                 if (id == ISCSI_MAX_TARGET) {
 954                         iscsi_cls_session_printk(KERN_ERR, session,
 955                                                  "Too many iscsi targets. Max "
 956                                                  "number of targets is %d.\n",
 957                                                  ISCSI_MAX_TARGET - 1);
 958                         err = -EOVERFLOW;
 959                         goto release_host;
 960                 }
 961         }
 962         session->target_id = id;
 963
 964         dev_set_name(&session->dev, "session%u", session->sid);
 965         err = device_add(&session->dev);
 966         if (err) {
 967                 iscsi_cls_session_printk(KERN_ERR, session,
 968                                          "could not register session's dev\n");
 969                 goto release_host;
 970         }
 971         transport_register_device(&session->dev);
 972
 973         spin_lock_irqsave(&sesslock, flags);
 974         list_add(&session->sess_list, &sesslist);
 975         spin_unlock_irqrestore(&sesslock, flags);
 976
 977         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
 978         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
 979         return 0;
 980
 981 release_host:
 982         scsi_host_put(shost);
 983         return err;
 984 }
 985 EXPORT_SYMBOL_GPL(iscsi_add_session);
 986
 987 /**
 988  * iscsi_create_session - create iscsi class session
 989  * @shost: scsi host
 990  * @transport: iscsi transport
 991  * @dd_size: private driver data size
 992  * @target_id: which target
 993  *
 994  * This can be called from a LLD or iscsi_transport.
 995  */
 996 struct iscsi_cls_session *
 997 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 998                      int dd_size, unsigned int target_id)
 999 {
1000         struct iscsi_cls_session *session;
1001
1002         session = iscsi_alloc_session(shost, transport, dd_size);
1003         if (!session)
1004                 return NULL;
1005
1006         if (iscsi_add_session(session, target_id)) {
1007                 iscsi_free_session(session);
1008                 return NULL;
1009         }
1010         return session;
1011 }
1012 EXPORT_SYMBOL_GPL(iscsi_create_session);
1013
1014 static void iscsi_conn_release(struct device *dev)
1015 {
1016         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1017         struct device *parent = conn->dev.parent;
1018
1019         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1020         kfree(conn);
1021         put_device(parent);
1022 }
1023
1024 static int iscsi_is_conn_dev(const struct device *dev)
1025 {
1026         return dev->release == iscsi_conn_release;
1027 }
1028
1029 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1030 {
1031         if (!iscsi_is_conn_dev(dev))
1032                 return 0;
1033         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1034 }
1035
1036 void iscsi_remove_session(struct iscsi_cls_session *session)
1037 {
1038         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1039         unsigned long flags;
1040         int err;
1041
1042         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1043
1044         spin_lock_irqsave(&sesslock, flags);
1045         list_del(&session->sess_list);
1046         spin_unlock_irqrestore(&sesslock, flags);
1047
1048         /* make sure there are no blocks/unblocks queued */
1049         flush_workqueue(iscsi_eh_timer_workq);
1050         /* make sure the timedout callout is not running */
1051         if (!cancel_delayed_work(&session->recovery_work))
1052                 flush_workqueue(iscsi_eh_timer_workq);
1053         /*
1054          * If we are blocked let commands flow again. The lld or iscsi
1055          * layer should set up the queuecommand to fail commands.
1056          * We assume that LLD will not be calling block/unblock while
1057          * removing the session.
1058          */
1059         spin_lock_irqsave(&session->lock, flags);
1060         session->state = ISCSI_SESSION_FREE;
1061         spin_unlock_irqrestore(&session->lock, flags);
1062
1063         scsi_target_unblock(&session->dev);
1064         /* flush running scans then delete devices */
1065         scsi_flush_work(shost);
1066         __iscsi_unbind_session(&session->unbind_work);
1067
1068         /* hw iscsi may not have removed all connections from session */
1069         err = device_for_each_child(&session->dev, NULL,
1070                                     iscsi_iter_destroy_conn_fn);
1071         if (err)
1072                 iscsi_cls_session_printk(KERN_ERR, session,
1073                                          "Could not delete all connections "
1074                                          "for session. Error %d.\n", err);
1075
1076         transport_unregister_device(&session->dev);
1077
1078         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1079         device_del(&session->dev);
1080 }
1081 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1082
1083 void iscsi_free_session(struct iscsi_cls_session *session)
1084 {
1085         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1086         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1087         put_device(&session->dev);
1088 }
1089 EXPORT_SYMBOL_GPL(iscsi_free_session);
1090
1091 /**
1092  * iscsi_destroy_session - destroy iscsi session
1093  * @session: iscsi_session
1094  *
1095  * Can be called by a LLD or iscsi_transport. There must not be
1096  * any running connections.
1097  */
1098 int iscsi_destroy_session(struct iscsi_cls_session *session)
1099 {
1100         iscsi_remove_session(session);
1101         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1102         iscsi_free_session(session);
1103         return 0;
1104 }
1105 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1106
1107 /**
1108  * iscsi_create_conn - create iscsi class connection
1109  * @session: iscsi cls session
1110  * @dd_size: private driver data size
1111  * @cid: connection id
1112  *
1113  * This can be called from a LLD or iscsi_transport. The connection
1114  * is child of the session so cid must be unique for all connections
1115  * on the session.
1116  *
1117  * Since we do not support MCS, cid will normally be zero. In some cases
1118  * for software iscsi we could be trying to preallocate a connection struct
1119  * in which case there could be two connection structs and cid would be
1120  * non-zero.
1121  */
1122 struct iscsi_cls_conn *
1123 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1124 {
1125         struct iscsi_transport *transport = session->transport;
1126         struct iscsi_cls_conn *conn;
1127         unsigned long flags;
1128         int err;
1129
1130         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1131         if (!conn)
1132                 return NULL;
1133         if (dd_size)
1134                 conn->dd_data = &conn[1];
1135
1136         mutex_init(&conn->ep_mutex);
1137         INIT_LIST_HEAD(&conn->conn_list);
1138         conn->transport = transport;
1139         conn->cid = cid;
1140
1141         /* this is released in the dev's release function */
1142         if (!get_device(&session->dev))
1143                 goto free_conn;
1144
1145         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1146         conn->dev.parent = &session->dev;
1147         conn->dev.release = iscsi_conn_release;
1148         err = device_register(&conn->dev);
1149         if (err) {
1150                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1151                                          "register connection's dev\n");
1152                 goto release_parent_ref;
1153         }
1154         transport_register_device(&conn->dev);
1155
1156         spin_lock_irqsave(&connlock, flags);
1157         list_add(&conn->conn_list, &connlist);
1158         spin_unlock_irqrestore(&connlock, flags);
1159
1160         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1161         return conn;
1162
1163 release_parent_ref:
1164         put_device(&session->dev);
1165 free_conn:
1166         kfree(conn);
1167         return NULL;
1168 }
1169
1170 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1171
1172 /**
1173  * iscsi_destroy_conn - destroy iscsi class connection
1174  * @conn: iscsi cls session
1175  *
1176  * This can be called from a LLD or iscsi_transport.
1177  */
1178 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1179 {
1180         unsigned long flags;
1181
1182         spin_lock_irqsave(&connlock, flags);
1183         list_del(&conn->conn_list);
1184         spin_unlock_irqrestore(&connlock, flags);
1185
1186         transport_unregister_device(&conn->dev);
1187         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1188         device_unregister(&conn->dev);
1189         return 0;
1190 }
1191 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1192
1193 /*
1194  * iscsi interface functions
1195  */
1196 static struct iscsi_internal *
1197 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1198 {
1199         struct iscsi_internal *priv;
1200         unsigned long flags;
1201
1202         spin_lock_irqsave(&iscsi_transport_lock, flags);
1203         list_for_each_entry(priv, &iscsi_transports, list) {
1204                 if (tt == priv->iscsi_transport) {
1205                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1206                         return priv;
1207                 }
1208         }
1209         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1210         return NULL;
1211 }
1212
1213 static int
1214 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1215 {
1216         return nlmsg_multicast(nls, skb, 0, group, gfp);
1217 }
1218
1219 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1220                    char *data, uint32_t data_size)
1221 {
1222         struct nlmsghdr *nlh;
1223         struct sk_buff *skb;
1224         struct iscsi_uevent *ev;
1225         char *pdu;
1226         struct iscsi_internal *priv;
1227         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1228                               data_size);
1229
1230         priv = iscsi_if_transport_lookup(conn->transport);
1231         if (!priv)
1232                 return -EINVAL;
1233
1234         skb = alloc_skb(len, GFP_ATOMIC);
1235         if (!skb) {
1236                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1237                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1238                                       "control PDU: OOM\n");
1239                 return -ENOMEM;
1240         }
1241
1242         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1243         ev = NLMSG_DATA(nlh);
1244         memset(ev, 0, sizeof(*ev));
1245         ev->transport_handle = iscsi_handle(conn->transport);
1246         ev->type = ISCSI_KEVENT_RECV_PDU;
1247         ev->r.recv_req.cid = conn->cid;
1248         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1249         pdu = (char*)ev + sizeof(*ev);
1250         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1251         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1252
1253         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1254 }
1255 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1256
1257 int iscsi_offload_mesg(struct Scsi_Host *shost,
1258                        struct iscsi_transport *transport, uint32_t type,
1259                        char *data, uint16_t data_size)
1260 {
1261         struct nlmsghdr *nlh;
1262         struct sk_buff *skb;
1263         struct iscsi_uevent *ev;
1264         int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1265
1266         skb = alloc_skb(len, GFP_ATOMIC);
1267         if (!skb) {
1268                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1269                 return -ENOMEM;
1270         }
1271
1272         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1273         ev = NLMSG_DATA(nlh);
1274         memset(ev, 0, sizeof(*ev));
1275         ev->type = type;
1276         ev->transport_handle = iscsi_handle(transport);
1277         switch (type) {
1278         case ISCSI_KEVENT_PATH_REQ:
1279                 ev->r.req_path.host_no = shost->host_no;
1280                 break;
1281         case ISCSI_KEVENT_IF_DOWN:
1282                 ev->r.notify_if_down.host_no = shost->host_no;
1283                 break;
1284         }
1285
1286         memcpy((char *)ev + sizeof(*ev), data, data_size);
1287
1288         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1289 }
1290 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1291
1292 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1293 {
1294         struct nlmsghdr *nlh;
1295         struct sk_buff  *skb;
1296         struct iscsi_uevent *ev;
1297         struct iscsi_internal *priv;
1298         int len = NLMSG_SPACE(sizeof(*ev));
1299
1300         priv = iscsi_if_transport_lookup(conn->transport);
1301         if (!priv)
1302                 return;
1303
1304         skb = alloc_skb(len, GFP_ATOMIC);
1305         if (!skb) {
1306                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1307                                       "conn error (%d)\n", error);
1308                 return;
1309         }
1310
1311         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1312         ev = NLMSG_DATA(nlh);
1313         ev->transport_handle = iscsi_handle(conn->transport);
1314         ev->type = ISCSI_KEVENT_CONN_ERROR;
1315         ev->r.connerror.error = error;
1316         ev->r.connerror.cid = conn->cid;
1317         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1318
1319         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1320
1321         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1322                               error);
1323 }
1324 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1325
1326 static int
1327 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1328                     void *payload, int size)
1329 {
1330         struct sk_buff  *skb;
1331         struct nlmsghdr *nlh;
1332         int len = NLMSG_SPACE(size);
1333         int flags = multi ? NLM_F_MULTI : 0;
1334         int t = done ? NLMSG_DONE : type;
1335
1336         skb = alloc_skb(len, GFP_ATOMIC);
1337         if (!skb) {
1338                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1339                 return -ENOMEM;
1340         }
1341
1342         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1343         nlh->nlmsg_flags = flags;
1344         memcpy(NLMSG_DATA(nlh), payload, size);
1345         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1346 }
1347
1348 static int
1349 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1350 {
1351         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1352         struct iscsi_stats *stats;
1353         struct sk_buff *skbstat;
1354         struct iscsi_cls_conn *conn;
1355         struct nlmsghdr *nlhstat;
1356         struct iscsi_uevent *evstat;
1357         struct iscsi_internal *priv;
1358         int len = NLMSG_SPACE(sizeof(*ev) +
1359                               sizeof(struct iscsi_stats) +
1360                               sizeof(struct iscsi_stats_custom) *
1361                               ISCSI_STATS_CUSTOM_MAX);
1362         int err = 0;
1363
1364         priv = iscsi_if_transport_lookup(transport);
1365         if (!priv)
1366                 return -EINVAL;
1367
1368         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1369         if (!conn)
1370                 return -EEXIST;
1371
1372         do {
1373                 int actual_size;
1374
1375                 skbstat = alloc_skb(len, GFP_ATOMIC);
1376                 if (!skbstat) {
1377                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1378                                               "deliver stats: OOM\n");
1379                         return -ENOMEM;
1380                 }
1381
1382                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1383                                       (len - sizeof(*nlhstat)), 0);
1384                 evstat = NLMSG_DATA(nlhstat);
1385                 memset(evstat, 0, sizeof(*evstat));
1386                 evstat->transport_handle = iscsi_handle(conn->transport);
1387                 evstat->type = nlh->nlmsg_type;
1388                 evstat->u.get_stats.cid =
1389                         ev->u.get_stats.cid;
1390                 evstat->u.get_stats.sid =
1391                         ev->u.get_stats.sid;
1392                 stats = (struct iscsi_stats *)
1393                         ((char*)evstat + sizeof(*evstat));
1394                 memset(stats, 0, sizeof(*stats));
1395
1396                 transport->get_stats(conn, stats);
1397                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1398                                           sizeof(struct iscsi_stats) +
1399                                           sizeof(struct iscsi_stats_custom) *
1400                                           stats->custom_length);
1401                 actual_size -= sizeof(*nlhstat);
1402                 actual_size = NLMSG_LENGTH(actual_size);
1403                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1404                 nlhstat->nlmsg_len = actual_size;
1405
1406                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1407                                           GFP_ATOMIC);
1408         } while (err < 0 && err != -ECONNREFUSED);
1409
1410         return err;
1411 }
1412
1413 /**
1414  * iscsi_session_event - send session destr. completion event
1415  * @session: iscsi class session
1416  * @event: type of event
1417  */
1418 int iscsi_session_event(struct iscsi_cls_session *session,
1419                         enum iscsi_uevent_e event)
1420 {
1421         struct iscsi_internal *priv;
1422         struct Scsi_Host *shost;
1423         struct iscsi_uevent *ev;
1424         struct sk_buff  *skb;
1425         struct nlmsghdr *nlh;
1426         int rc, len = NLMSG_SPACE(sizeof(*ev));
1427
1428         priv = iscsi_if_transport_lookup(session->transport);
1429         if (!priv)
1430                 return -EINVAL;
1431         shost = iscsi_session_to_shost(session);
1432
1433         skb = alloc_skb(len, GFP_KERNEL);
1434         if (!skb) {
1435                 iscsi_cls_session_printk(KERN_ERR, session,
1436                                          "Cannot notify userspace of session "
1437                                          "event %u\n", event);
1438                 return -ENOMEM;
1439         }
1440
1441         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1442         ev = NLMSG_DATA(nlh);
1443         ev->transport_handle = iscsi_handle(session->transport);
1444
1445         ev->type = event;
1446         switch (event) {
1447         case ISCSI_KEVENT_DESTROY_SESSION:
1448                 ev->r.d_session.host_no = shost->host_no;
1449                 ev->r.d_session.sid = session->sid;
1450                 break;
1451         case ISCSI_KEVENT_CREATE_SESSION:
1452                 ev->r.c_session_ret.host_no = shost->host_no;
1453                 ev->r.c_session_ret.sid = session->sid;
1454                 break;
1455         case ISCSI_KEVENT_UNBIND_SESSION:
1456                 ev->r.unbind_session.host_no = shost->host_no;
1457                 ev->r.unbind_session.sid = session->sid;
1458                 break;
1459         default:
1460                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1461                                          "%u.\n", event);
1462                 kfree_skb(skb);
1463                 return -EINVAL;
1464         }
1465
1466         /*
1467          * this will occur if the daemon is not up, so we just warn
1468          * the user and when the daemon is restarted it will handle it
1469          */
1470         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1471         if (rc == -ESRCH)
1472                 iscsi_cls_session_printk(KERN_ERR, session,
1473                                          "Cannot notify userspace of session "
1474                                          "event %u. Check iscsi daemon\n",
1475                                          event);
1476
1477         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1478                                 event, rc);
1479         return rc;
1480 }
1481 EXPORT_SYMBOL_GPL(iscsi_session_event);
1482
1483 static int
1484 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1485                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1486                         uint16_t cmds_max, uint16_t queue_depth)
1487 {
1488         struct iscsi_transport *transport = priv->iscsi_transport;
1489         struct iscsi_cls_session *session;
1490         struct Scsi_Host *shost;
1491
1492         session = transport->create_session(ep, cmds_max, queue_depth,
1493                                             initial_cmdsn);
1494         if (!session)
1495                 return -ENOMEM;
1496
1497         shost = iscsi_session_to_shost(session);
1498         ev->r.c_session_ret.host_no = shost->host_no;
1499         ev->r.c_session_ret.sid = session->sid;
1500         ISCSI_DBG_TRANS_SESSION(session,
1501                                 "Completed creating transport session\n");
1502         return 0;
1503 }
1504
1505 static int
1506 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1507 {
1508         struct iscsi_cls_conn *conn;
1509         struct iscsi_cls_session *session;
1510
1511         session = iscsi_session_lookup(ev->u.c_conn.sid);
1512         if (!session) {
1513                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1514                        ev->u.c_conn.sid);
1515                 return -EINVAL;
1516         }
1517
1518         conn = transport->create_conn(session, ev->u.c_conn.cid);
1519         if (!conn) {
1520                 iscsi_cls_session_printk(KERN_ERR, session,
1521                                          "couldn't create a new connection.");
1522                 return -ENOMEM;
1523         }
1524
1525         ev->r.c_conn_ret.sid = session->sid;
1526         ev->r.c_conn_ret.cid = conn->cid;
1527
1528         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1529         return 0;
1530 }
1531
1532 static int
1533 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1534 {
1535         struct iscsi_cls_conn *conn;
1536
1537         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1538         if (!conn)
1539                 return -EINVAL;
1540
1541         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1542         if (transport->destroy_conn)
1543                 transport->destroy_conn(conn);
1544
1545         return 0;
1546 }
1547
1548 static int
1549 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1550 {
1551         char *data = (char*)ev + sizeof(*ev);
1552         struct iscsi_cls_conn *conn;
1553         struct iscsi_cls_session *session;
1554         int err = 0, value = 0;
1555
1556         session = iscsi_session_lookup(ev->u.set_param.sid);
1557         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1558         if (!conn || !session)
1559                 return -EINVAL;
1560
1561         switch (ev->u.set_param.param) {
1562         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1563                 sscanf(data, "%d", &value);
1564                 session->recovery_tmo = value;
1565                 break;
1566         default:
1567                 err = transport->set_param(conn, ev->u.set_param.param,
1568                                            data, ev->u.set_param.len);
1569         }
1570
1571         return err;
1572 }
1573
1574 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1575                                struct iscsi_uevent *ev, int msg_type)
1576 {
1577         struct iscsi_endpoint *ep;
1578         struct sockaddr *dst_addr;
1579         struct Scsi_Host *shost = NULL;
1580         int non_blocking, err = 0;
1581
1582         if (!transport->ep_connect)
1583                 return -EINVAL;
1584
1585         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1586                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1587                 if (!shost) {
1588                         printk(KERN_ERR "ep connect failed. Could not find "
1589                                "host no %u\n",
1590                                ev->u.ep_connect_through_host.host_no);
1591                         return -ENODEV;
1592                 }
1593                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1594         } else
1595                 non_blocking = ev->u.ep_connect.non_blocking;
1596
1597         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1598         ep = transport->ep_connect(shost, dst_addr, non_blocking);
1599         if (IS_ERR(ep)) {
1600                 err = PTR_ERR(ep);
1601                 goto release_host;
1602         }
1603
1604         ev->r.ep_connect_ret.handle = ep->id;
1605 release_host:
1606         if (shost)
1607                 scsi_host_put(shost);
1608         return err;
1609 }
1610
1611 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1612                                   u64 ep_handle)
1613 {
1614         struct iscsi_cls_conn *conn;
1615         struct iscsi_endpoint *ep;
1616
1617         if (!transport->ep_disconnect)
1618                 return -EINVAL;
1619
1620         ep = iscsi_lookup_endpoint(ep_handle);
1621         if (!ep)
1622                 return -EINVAL;
1623         conn = ep->conn;
1624         if (conn) {
1625                 mutex_lock(&conn->ep_mutex);
1626                 conn->ep = NULL;
1627                 mutex_unlock(&conn->ep_mutex);
1628         }
1629
1630         transport->ep_disconnect(ep);
1631         return 0;
1632 }
1633
1634 static int
1635 iscsi_if_transport_ep(struct iscsi_transport *transport,
1636                       struct iscsi_uevent *ev, int msg_type)
1637 {
1638         struct iscsi_endpoint *ep;
1639         int rc = 0;
1640
1641         switch (msg_type) {
1642         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1643         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1644                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1645                 break;
1646         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1647                 if (!transport->ep_poll)
1648                         return -EINVAL;
1649
1650                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1651                 if (!ep)
1652                         return -EINVAL;
1653
1654                 ev->r.retcode = transport->ep_poll(ep,
1655                                                    ev->u.ep_poll.timeout_ms);
1656                 break;
1657         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1658                 rc = iscsi_if_ep_disconnect(transport,
1659                                             ev->u.ep_disconnect.ep_handle);
1660                 break;
1661         }
1662         return rc;
1663 }
1664
1665 static int
1666 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1667                 struct iscsi_uevent *ev)
1668 {
1669         struct Scsi_Host *shost;
1670         struct sockaddr *dst_addr;
1671         int err;
1672
1673         if (!transport->tgt_dscvr)
1674                 return -EINVAL;
1675
1676         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1677         if (!shost) {
1678                 printk(KERN_ERR "target discovery could not find host no %u\n",
1679                        ev->u.tgt_dscvr.host_no);
1680                 return -ENODEV;
1681         }
1682
1683
1684         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1685         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1686                                    ev->u.tgt_dscvr.enable, dst_addr);
1687         scsi_host_put(shost);
1688         return err;
1689 }
1690
1691 static int
1692 iscsi_set_host_param(struct iscsi_transport *transport,
1693                      struct iscsi_uevent *ev)
1694 {
1695         char *data = (char*)ev + sizeof(*ev);
1696         struct Scsi_Host *shost;
1697         int err;
1698
1699         if (!transport->set_host_param)
1700                 return -ENOSYS;
1701
1702         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1703         if (!shost) {
1704                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1705                        ev->u.set_host_param.host_no);
1706                 return -ENODEV;
1707         }
1708
1709         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1710                                         data, ev->u.set_host_param.len);
1711         scsi_host_put(shost);
1712         return err;
1713 }
1714
1715 static int
1716 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1717 {
1718         struct Scsi_Host *shost;
1719         struct iscsi_path *params;
1720         int err;
1721
1722         if (!transport->set_path)
1723                 return -ENOSYS;
1724
1725         shost = scsi_host_lookup(ev->u.set_path.host_no);
1726         if (!shost) {
1727                 printk(KERN_ERR "set path could not find host no %u\n",
1728                        ev->u.set_path.host_no);
1729                 return -ENODEV;
1730         }
1731
1732         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1733         err = transport->set_path(shost, params);
1734
1735         scsi_host_put(shost);
1736         return err;
1737 }
1738
1739 static int
1740 iscsi_set_iface_params(struct iscsi_transport *transport,
1741                        struct iscsi_uevent *ev)
1742 {
1743         char *data = (char *)ev + sizeof(*ev);
1744         struct Scsi_Host *shost;
1745         int err;
1746
1747         if (!transport->set_iface_param)
1748                 return -ENOSYS;
1749
1750         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1751         if (!shost) {
1752                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1753                        ev->u.set_iface_params.host_no);
1754                 return -ENODEV;
1755         }
1756
1757         err = transport->set_iface_param(shost, data,
1758                                          ev->u.set_iface_params.count);
1759         scsi_host_put(shost);
1760         return err;
1761 }
1762
1763 static int
1764 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1765 {
1766         int err = 0;
1767         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1768         struct iscsi_transport *transport = NULL;
1769         struct iscsi_internal *priv;
1770         struct iscsi_cls_session *session;
1771         struct iscsi_cls_conn *conn;
1772         struct iscsi_endpoint *ep = NULL;
1773
1774         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1775                 *group = ISCSI_NL_GRP_UIP;
1776         else
1777                 *group = ISCSI_NL_GRP_ISCSID;
1778
1779         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1780         if (!priv)
1781                 return -EINVAL;
1782         transport = priv->iscsi_transport;
1783
1784         if (!try_module_get(transport->owner))
1785                 return -EINVAL;
1786
1787         switch (nlh->nlmsg_type) {
1788         case ISCSI_UEVENT_CREATE_SESSION:
1789                 err = iscsi_if_create_session(priv, ep, ev,
1790                                               ev->u.c_session.initial_cmdsn,
1791                                               ev->u.c_session.cmds_max,
1792                                               ev->u.c_session.queue_depth);
1793                 break;
1794         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1795                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1796                 if (!ep) {
1797                         err = -EINVAL;
1798                         break;
1799                 }
1800
1801                 err = iscsi_if_create_session(priv, ep, ev,
1802                                         ev->u.c_bound_session.initial_cmdsn,
1803                                         ev->u.c_bound_session.cmds_max,
1804                                         ev->u.c_bound_session.queue_depth);
1805                 break;
1806         case ISCSI_UEVENT_DESTROY_SESSION:
1807                 session = iscsi_session_lookup(ev->u.d_session.sid);
1808                 if (session)
1809                         transport->destroy_session(session);
1810                 else
1811                         err = -EINVAL;
1812                 break;
1813         case ISCSI_UEVENT_UNBIND_SESSION:
1814                 session = iscsi_session_lookup(ev->u.d_session.sid);
1815                 if (session)
1816                         scsi_queue_work(iscsi_session_to_shost(session),
1817                                         &session->unbind_work);
1818                 else
1819                         err = -EINVAL;
1820                 break;
1821         case ISCSI_UEVENT_CREATE_CONN:
1822                 err = iscsi_if_create_conn(transport, ev);
1823                 break;
1824         case ISCSI_UEVENT_DESTROY_CONN:
1825                 err = iscsi_if_destroy_conn(transport, ev);
1826                 break;
1827         case ISCSI_UEVENT_BIND_CONN:
1828                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1829                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1830
1831                 if (conn && conn->ep)
1832                         iscsi_if_ep_disconnect(transport, conn->ep->id);
1833
1834                 if (!session || !conn) {
1835                         err = -EINVAL;
1836                         break;
1837                 }
1838
1839                 ev->r.retcode = transport->bind_conn(session, conn,
1840                                                 ev->u.b_conn.transport_eph,
1841                                                 ev->u.b_conn.is_leading);
1842                 if (ev->r.retcode || !transport->ep_connect)
1843                         break;
1844
1845                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1846                 if (ep) {
1847                         ep->conn = conn;
1848
1849                         mutex_lock(&conn->ep_mutex);
1850                         conn->ep = ep;
1851                         mutex_unlock(&conn->ep_mutex);
1852                 } else
1853                         iscsi_cls_conn_printk(KERN_ERR, conn,
1854                                               "Could not set ep conn "
1855                                               "binding\n");
1856                 break;
1857         case ISCSI_UEVENT_SET_PARAM:
1858                 err = iscsi_set_param(transport, ev);
1859                 break;
1860         case ISCSI_UEVENT_START_CONN:
1861                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1862                 if (conn)
1863                         ev->r.retcode = transport->start_conn(conn);
1864                 else
1865                         err = -EINVAL;
1866                 break;
1867         case ISCSI_UEVENT_STOP_CONN:
1868                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1869                 if (conn)
1870                         transport->stop_conn(conn, ev->u.stop_conn.flag);
1871                 else
1872                         err = -EINVAL;
1873                 break;
1874         case ISCSI_UEVENT_SEND_PDU:
1875                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1876                 if (conn)
1877                         ev->r.retcode = transport->send_pdu(conn,
1878                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1879                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1880                                 ev->u.send_pdu.data_size);
1881                 else
1882                         err = -EINVAL;
1883                 break;
1884         case ISCSI_UEVENT_GET_STATS:
1885                 err = iscsi_if_get_stats(transport, nlh);
1886                 break;
1887         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1888         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1889         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1890         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1891                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1892                 break;
1893         case ISCSI_UEVENT_TGT_DSCVR:
1894                 err = iscsi_tgt_dscvr(transport, ev);
1895                 break;
1896         case ISCSI_UEVENT_SET_HOST_PARAM:
1897                 err = iscsi_set_host_param(transport, ev);
1898                 break;
1899         case ISCSI_UEVENT_PATH_UPDATE:
1900                 err = iscsi_set_path(transport, ev);
1901                 break;
1902         case ISCSI_UEVENT_SET_IFACE_PARAMS:
1903                 err = iscsi_set_iface_params(transport, ev);
1904                 break;
1905         default:
1906                 err = -ENOSYS;
1907                 break;
1908         }
1909
1910         module_put(transport->owner);
1911         return err;
1912 }
1913
1914 /*
1915  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1916  * Malformed skbs with wrong lengths or invalid creds are not processed.
1917  */
1918 static void
1919 iscsi_if_rx(struct sk_buff *skb)
1920 {
1921         mutex_lock(&rx_queue_mutex);
1922         while (skb->len >= NLMSG_SPACE(0)) {
1923                 int err;
1924                 uint32_t rlen;
1925                 struct nlmsghdr *nlh;
1926                 struct iscsi_uevent *ev;
1927                 uint32_t group;
1928
1929                 nlh = nlmsg_hdr(skb);
1930                 if (nlh->nlmsg_len < sizeof(*nlh) ||
1931                     skb->len < nlh->nlmsg_len) {
1932                         break;
1933                 }
1934
1935                 ev = NLMSG_DATA(nlh);
1936                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1937                 if (rlen > skb->len)
1938                         rlen = skb->len;
1939
1940                 err = iscsi_if_recv_msg(skb, nlh, &group);
1941                 if (err) {
1942                         ev->type = ISCSI_KEVENT_IF_ERROR;
1943                         ev->iferror = err;
1944                 }
1945                 do {
1946                         /*
1947                          * special case for GET_STATS:
1948                          * on success - sending reply and stats from
1949                          * inside of if_recv_msg(),
1950                          * on error - fall through.
1951                          */
1952                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1953                                 break;
1954                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1955                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1956                 } while (err < 0 && err != -ECONNREFUSED);
1957                 skb_pull(skb, rlen);
1958         }
1959         mutex_unlock(&rx_queue_mutex);
1960 }
1961
1962 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
1963 struct device_attribute dev_attr_##_prefix##_##_name =  \
1964         __ATTR(_name,_mode,_show,_store)
1965
1966 /*
1967  * iSCSI connection attrs
1968  */
1969 #define iscsi_conn_attr_show(param)                                     \
1970 static ssize_t                                                          \
1971 show_conn_param_##param(struct device *dev,                             \
1972                         struct device_attribute *attr, char *buf)       \
1973 {                                                                       \
1974         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
1975         struct iscsi_transport *t = conn->transport;                    \
1976         return t->get_conn_param(conn, param, buf);                     \
1977 }
1978
1979 #define iscsi_conn_attr(field, param)                                   \
1980         iscsi_conn_attr_show(param)                                     \
1981 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
1982                         NULL);
1983
1984 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1985 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1986 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1987 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1988 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1989 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1990 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1991 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1992 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1993 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1994 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1995
1996 #define iscsi_conn_ep_attr_show(param)                                  \
1997 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
1998                                           struct device_attribute *attr,\
1999                                           char *buf)                    \
2000 {                                                                       \
2001         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2002         struct iscsi_transport *t = conn->transport;                    \
2003         struct iscsi_endpoint *ep;                                      \
2004         ssize_t rc;                                                     \
2005                                                                         \
2006         /*                                                              \
2007          * Need to make sure ep_disconnect does not free the LLD's      \
2008          * interconnect resources while we are trying to read them.     \
2009          */                                                             \
2010         mutex_lock(&conn->ep_mutex);                                    \
2011         ep = conn->ep;                                                  \
2012         if (!ep && t->ep_connect) {                                     \
2013                 mutex_unlock(&conn->ep_mutex);                          \
2014                 return -ENOTCONN;                                       \
2015         }                                                               \
2016                                                                         \
2017         if (ep)                                                         \
2018                 rc = t->get_ep_param(ep, param, buf);                   \
2019         else                                                            \
2020                 rc = t->get_conn_param(conn, param, buf);               \
2021         mutex_unlock(&conn->ep_mutex);                                  \
2022         return rc;                                                      \
2023 }
2024
2025 #define iscsi_conn_ep_attr(field, param)                                \
2026         iscsi_conn_ep_attr_show(param)                                  \
2027 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2028                         show_conn_ep_param_##param, NULL);
2029
2030 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2031 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2032
2033 /*
2034  * iSCSI session attrs
2035  */
2036 #define iscsi_session_attr_show(param, perm)                            \
2037 static ssize_t                                                          \
2038 show_session_param_##param(struct device *dev,                          \
2039                            struct device_attribute *attr, char *buf)    \
2040 {                                                                       \
2041         struct iscsi_cls_session *session =                             \
2042                 iscsi_dev_to_session(dev->parent);                      \
2043         struct iscsi_transport *t = session->transport;                 \
2044                                                                         \
2045         if (perm && !capable(CAP_SYS_ADMIN))                            \
2046                 return -EACCES;                                         \
2047         return t->get_session_param(session, param, buf);               \
2048 }
2049
2050 #define iscsi_session_attr(field, param, perm)                          \
2051         iscsi_session_attr_show(param, perm)                            \
2052 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2053                         NULL);
2054
2055 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2056 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2057 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2058 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2059 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2060 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2061 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2062 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2063 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2064 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2065 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2066 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2067 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2068 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2069 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2070 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2071 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2072 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2073 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2074 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2075 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2076
2077 static ssize_t
2078 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2079                         char *buf)
2080 {
2081         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2082         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2083 }
2084 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2085                         NULL);
2086
2087 #define iscsi_priv_session_attr_show(field, format)                     \
2088 static ssize_t                                                          \
2089 show_priv_session_##field(struct device *dev,                           \
2090                           struct device_attribute *attr, char *buf)     \
2091 {                                                                       \
2092         struct iscsi_cls_session *session =                             \
2093                         iscsi_dev_to_session(dev->parent);              \
2094         if (session->field == -1)                                       \
2095                 return sprintf(buf, "off\n");                           \
2096         return sprintf(buf, format"\n", session->field);                \
2097 }
2098
2099 #define iscsi_priv_session_attr_store(field)                            \
2100 static ssize_t                                                          \
2101 store_priv_session_##field(struct device *dev,                          \
2102                            struct device_attribute *attr,               \
2103                            const char *buf, size_t count)               \
2104 {                                                                       \
2105         int val;                                                        \
2106         char *cp;                                                       \
2107         struct iscsi_cls_session *session =                             \
2108                 iscsi_dev_to_session(dev->parent);                      \
2109         if ((session->state == ISCSI_SESSION_FREE) ||                   \
2110             (session->state == ISCSI_SESSION_FAILED))                   \
2111                 return -EBUSY;                                          \
2112         if (strncmp(buf, "off", 3) == 0)                                \
2113                 session->field = -1;                                    \
2114         else {                                                          \
2115                 val = simple_strtoul(buf, &cp, 0);                      \
2116                 if (*cp != '\0' && *cp != '\n')                         \
2117                         return -EINVAL;                                 \
2118                 session->field = val;                                   \
2119         }                                                               \
2120         return count;                                                   \
2121 }
2122
2123 #define iscsi_priv_session_rw_attr(field, format)                       \
2124         iscsi_priv_session_attr_show(field, format)                     \
2125         iscsi_priv_session_attr_store(field)                            \
2126 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2127                         show_priv_session_##field,                      \
2128                         store_priv_session_##field)
2129 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2130
2131 /*
2132  * iSCSI host attrs
2133  */
2134 #define iscsi_host_attr_show(param)                                     \
2135 static ssize_t                                                          \
2136 show_host_param_##param(struct device *dev,                             \
2137                         struct device_attribute *attr, char *buf)       \
2138 {                                                                       \
2139         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2140         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2141         return priv->iscsi_transport->get_host_param(shost, param, buf); \
2142 }
2143
2144 #define iscsi_host_attr(field, param)                                   \
2145         iscsi_host_attr_show(param)                                     \
2146 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2147                         NULL);
2148
2149 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2150 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2151 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2152 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2153
2154 #define SETUP_PRIV_SESSION_RD_ATTR(field)                               \
2155 do {                                                                    \
2156         priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
2157         count++;                                                        \
2158 } while (0)
2159
2160 #define SETUP_PRIV_SESSION_RW_ATTR(field)                               \
2161 do {                                                                    \
2162         priv->session_attrs[count] = &dev_attr_priv_sess_##field;       \
2163         count++;                                                        \
2164 } while (0)
2165
2166 #define SETUP_SESSION_RD_ATTR(field, param_flag)                        \
2167 do {                                                                    \
2168         if (tt->param_mask & param_flag) {                              \
2169                 priv->session_attrs[count] = &dev_attr_sess_##field; \
2170                 count++;                                                \
2171         }                                                               \
2172 } while (0)
2173
2174 #define SETUP_CONN_RD_ATTR(field, param_flag)                           \
2175 do {                                                                    \
2176         if (tt->param_mask & param_flag) {                              \
2177                 priv->conn_attrs[count] = &dev_attr_conn_##field; \
2178                 count++;                                                \
2179         }                                                               \
2180 } while (0)
2181
2182 #define SETUP_HOST_RD_ATTR(field, param_flag)                           \
2183 do {                                                                    \
2184         if (tt->host_param_mask & param_flag) {                         \
2185                 priv->host_attrs[count] = &dev_attr_host_##field; \
2186                 count++;                                                \
2187         }                                                               \
2188 } while (0)
2189
2190 static int iscsi_session_match(struct attribute_container *cont,
2191                            struct device *dev)
2192 {
2193         struct iscsi_cls_session *session;
2194         struct Scsi_Host *shost;
2195         struct iscsi_internal *priv;
2196
2197         if (!iscsi_is_session_dev(dev))
2198                 return 0;
2199
2200         session = iscsi_dev_to_session(dev);
2201         shost = iscsi_session_to_shost(session);
2202         if (!shost->transportt)
2203                 return 0;
2204
2205         priv = to_iscsi_internal(shost->transportt);
2206         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2207                 return 0;
2208
2209         return &priv->session_cont.ac == cont;
2210 }
2211
2212 static int iscsi_conn_match(struct attribute_container *cont,
2213                            struct device *dev)
2214 {
2215         struct iscsi_cls_session *session;
2216         struct iscsi_cls_conn *conn;
2217         struct Scsi_Host *shost;
2218         struct iscsi_internal *priv;
2219
2220         if (!iscsi_is_conn_dev(dev))
2221                 return 0;
2222
2223         conn = iscsi_dev_to_conn(dev);
2224         session = iscsi_dev_to_session(conn->dev.parent);
2225         shost = iscsi_session_to_shost(session);
2226
2227         if (!shost->transportt)
2228                 return 0;
2229
2230         priv = to_iscsi_internal(shost->transportt);
2231         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2232                 return 0;
2233
2234         return &priv->conn_cont.ac == cont;
2235 }
2236
2237 static int iscsi_host_match(struct attribute_container *cont,
2238                             struct device *dev)
2239 {
2240         struct Scsi_Host *shost;
2241         struct iscsi_internal *priv;
2242
2243         if (!scsi_is_host_device(dev))
2244                 return 0;
2245
2246         shost = dev_to_shost(dev);
2247         if (!shost->transportt  ||
2248             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2249                 return 0;
2250
2251         priv = to_iscsi_internal(shost->transportt);
2252         return &priv->t.host_attrs.ac == cont;
2253 }
2254
2255 struct scsi_transport_template *
2256 iscsi_register_transport(struct iscsi_transport *tt)
2257 {
2258         struct iscsi_internal *priv;
2259         unsigned long flags;
2260         int count = 0, err;
2261
2262         BUG_ON(!tt);
2263
2264         priv = iscsi_if_transport_lookup(tt);
2265         if (priv)
2266                 return NULL;
2267
2268         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2269         if (!priv)
2270                 return NULL;
2271         INIT_LIST_HEAD(&priv->list);
2272         priv->iscsi_transport = tt;
2273         priv->t.user_scan = iscsi_user_scan;
2274         priv->t.create_work_queue = 1;
2275
2276         priv->dev.class = &iscsi_transport_class;
2277         dev_set_name(&priv->dev, "%s", tt->name);
2278         err = device_register(&priv->dev);
2279         if (err)
2280                 goto free_priv;
2281
2282         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2283         if (err)
2284                 goto unregister_dev;
2285
2286         /* host parameters */
2287         priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2288         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2289         priv->t.host_attrs.ac.match = iscsi_host_match;
2290         priv->t.host_size = sizeof(struct iscsi_cls_host);
2291         transport_container_register(&priv->t.host_attrs);
2292
2293         SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
2294         SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
2295         SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
2296         SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
2297         BUG_ON(count > ISCSI_HOST_ATTRS);
2298         priv->host_attrs[count] = NULL;
2299         count = 0;
2300
2301         /* connection parameters */
2302         priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
2303         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2304         priv->conn_cont.ac.match = iscsi_conn_match;
2305         transport_container_register(&priv->conn_cont);
2306
2307         SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
2308         SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
2309         SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
2310         SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
2311         SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
2312         SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
2313         SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
2314         SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
2315         SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
2316         SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
2317         SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
2318         SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
2319         SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
2320
2321         BUG_ON(count > ISCSI_CONN_ATTRS);
2322         priv->conn_attrs[count] = NULL;
2323         count = 0;
2324
2325         /* session parameters */
2326         priv->session_cont.ac.attrs = &priv->session_attrs[0];
2327         priv->session_cont.ac.class = &iscsi_session_class.class;
2328         priv->session_cont.ac.match = iscsi_session_match;
2329         transport_container_register(&priv->session_cont);
2330
2331         SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
2332         SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
2333         SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
2334         SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
2335         SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
2336         SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
2337         SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
2338         SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
2339         SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
2340         SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
2341         SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2342         SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2343         SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2344         SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2345         SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2346         SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2347         SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2348         SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
2349         SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2350         SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2351         SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
2352         SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
2353         SETUP_PRIV_SESSION_RD_ATTR(state);
2354
2355         BUG_ON(count > ISCSI_SESSION_ATTRS);
2356         priv->session_attrs[count] = NULL;
2357         count = 0;
2358
2359         spin_lock_irqsave(&iscsi_transport_lock, flags);
2360         list_add(&priv->list, &iscsi_transports);
2361         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2362
2363         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2364         return &priv->t;
2365
2366 unregister_dev:
2367         device_unregister(&priv->dev);
2368         return NULL;
2369 free_priv:
2370         kfree(priv);
2371         return NULL;
2372 }
2373 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2374
2375 int iscsi_unregister_transport(struct iscsi_transport *tt)
2376 {
2377         struct iscsi_internal *priv;
2378         unsigned long flags;
2379
2380         BUG_ON(!tt);
2381
2382         mutex_lock(&rx_queue_mutex);
2383
2384         priv = iscsi_if_transport_lookup(tt);
2385         BUG_ON (!priv);
2386
2387         spin_lock_irqsave(&iscsi_transport_lock, flags);
2388         list_del(&priv->list);
2389         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2390
2391         transport_container_unregister(&priv->conn_cont);
2392         transport_container_unregister(&priv->session_cont);
2393         transport_container_unregister(&priv->t.host_attrs);
2394
2395         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2396         device_unregister(&priv->dev);
2397         mutex_unlock(&rx_queue_mutex);
2398
2399         return 0;
2400 }
2401 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2402
2403 static __init int iscsi_transport_init(void)
2404 {
2405         int err;
2406
2407         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2408                 ISCSI_TRANSPORT_VERSION);
2409
2410         atomic_set(&iscsi_session_nr, 0);
2411
2412         err = class_register(&iscsi_transport_class);
2413         if (err)
2414                 return err;
2415
2416         err = class_register(&iscsi_endpoint_class);
2417         if (err)
2418                 goto unregister_transport_class;
2419
2420         err = class_register(&iscsi_iface_class);
2421         if (err)
2422                 goto unregister_endpoint_class;
2423
2424         err = transport_class_register(&iscsi_host_class);
2425         if (err)
2426                 goto unregister_iface_class;
2427
2428         err = transport_class_register(&iscsi_connection_class);
2429         if (err)
2430                 goto unregister_host_class;
2431
2432         err = transport_class_register(&iscsi_session_class);
2433         if (err)
2434                 goto unregister_conn_class;
2435
2436         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2437                                     NULL, THIS_MODULE);
2438         if (!nls) {
2439                 err = -ENOBUFS;
2440                 goto unregister_session_class;
2441         }
2442
2443         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2444         if (!iscsi_eh_timer_workq)
2445                 goto release_nls;
2446
2447         return 0;
2448
2449 release_nls:
2450         netlink_kernel_release(nls);
2451 unregister_session_class:
2452         transport_class_unregister(&iscsi_session_class);
2453 unregister_conn_class:
2454         transport_class_unregister(&iscsi_connection_class);
2455 unregister_host_class:
2456         transport_class_unregister(&iscsi_host_class);
2457 unregister_iface_class:
2458         class_unregister(&iscsi_iface_class);
2459 unregister_endpoint_class:
2460         class_unregister(&iscsi_endpoint_class);
2461 unregister_transport_class:
2462         class_unregister(&iscsi_transport_class);
2463         return err;
2464 }
2465
2466 static void __exit iscsi_transport_exit(void)
2467 {
2468         destroy_workqueue(iscsi_eh_timer_workq);
2469         netlink_kernel_release(nls);
2470         transport_class_unregister(&iscsi_connection_class);
2471         transport_class_unregister(&iscsi_session_class);
2472         transport_class_unregister(&iscsi_host_class);
2473         class_unregister(&iscsi_endpoint_class);
2474         class_unregister(&iscsi_iface_class);
2475         class_unregister(&iscsi_transport_class);
2476 }
2477
2478 module_init(iscsi_transport_init);
2479 module_exit(iscsi_transport_exit);
2480
2481 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2482               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2483               "Alex Aizman <itn780@yahoo.com>");
2484 MODULE_DESCRIPTION("iSCSI Transport Interface");
2485 MODULE_LICENSE("GPL");
2486 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2487 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);