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_TRANSPORT_VERSION "2.0-870"
  36
  37 static int dbg_session;
  38 module_param_named(debug_session, dbg_session, int,
  39                    S_IRUGO | S_IWUSR);
  40 MODULE_PARM_DESC(debug_session,
  41                  "Turn on debugging for sessions in scsi_transport_iscsi "
  42                  "module. Set to 1 to turn on, and zero to turn off. Default "
  43                  "is off.");
  44
  45 static int dbg_conn;
  46 module_param_named(debug_conn, dbg_conn, int,
  47                    S_IRUGO | S_IWUSR);
  48 MODULE_PARM_DESC(debug_conn,
  49                  "Turn on debugging for connections in scsi_transport_iscsi "
  50                  "module. Set to 1 to turn on, and zero to turn off. Default "
  51                  "is off.");
  52
  53 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  54         do {                                                            \
  55                 if (dbg_session)                                        \
  56                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  57                                                  "%s: " dbg_fmt,        \
  58                                                  __func__, ##arg);      \
  59         } while (0);
  60
  61 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  62         do {                                                            \
  63                 if (dbg_conn)                                           \
  64                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  65                                               "%s: " dbg_fmt,           \
  66                                               __func__, ##arg); \
  67         } while (0);
  68
  69 struct iscsi_internal {
  70         struct scsi_transport_template t;
  71         struct iscsi_transport *iscsi_transport;
  72         struct list_head list;
  73         struct device dev;
  74
  75         struct transport_container conn_cont;
  76         struct transport_container session_cont;
  77 };
  78
  79 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  80 static struct workqueue_struct *iscsi_eh_timer_workq;
  81
  82 /*
  83  * list of registered transports and lock that must
  84  * be held while accessing list. The iscsi_transport_lock must
  85  * be acquired after the rx_queue_mutex.
  86  */
  87 static LIST_HEAD(iscsi_transports);
  88 static DEFINE_SPINLOCK(iscsi_transport_lock);
  89
  90 #define to_iscsi_internal(tmpl) \
  91         container_of(tmpl, struct iscsi_internal, t)
  92
  93 #define dev_to_iscsi_internal(_dev) \
  94         container_of(_dev, struct iscsi_internal, dev)
  95
  96 static void iscsi_transport_release(struct device *dev)
  97 {
  98         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
  99         kfree(priv);
 100 }
 101
 102 /*
 103  * iscsi_transport_class represents the iscsi_transports that are
 104  * registered.
 105  */
 106 static struct class iscsi_transport_class = {
 107         .name = "iscsi_transport",
 108         .dev_release = iscsi_transport_release,
 109 };
 110
 111 static ssize_t
 112 show_transport_handle(struct device *dev, struct device_attribute *attr,
 113                       char *buf)
 114 {
 115         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 116         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 117 }
 118 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 119
 120 #define show_transport_attr(name, format)                               \
 121 static ssize_t                                                          \
 122 show_transport_##name(struct device *dev,                               \
 123                       struct device_attribute *attr,char *buf)          \
 124 {                                                                       \
 125         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 126         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 127 }                                                                       \
 128 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 129
 130 show_transport_attr(caps, "0x%x");
 131
 132 static struct attribute *iscsi_transport_attrs[] = {
 133         &dev_attr_handle.attr,
 134         &dev_attr_caps.attr,
 135         NULL,
 136 };
 137
 138 static struct attribute_group iscsi_transport_group = {
 139         .attrs = iscsi_transport_attrs,
 140 };
 141
 142 /*
 143  * iSCSI endpoint attrs
 144  */
 145 #define iscsi_dev_to_endpoint(_dev) \
 146         container_of(_dev, struct iscsi_endpoint, dev)
 147
 148 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 149 struct device_attribute dev_attr_##_prefix##_##_name =  \
 150         __ATTR(_name,_mode,_show,_store)
 151
 152 static void iscsi_endpoint_release(struct device *dev)
 153 {
 154         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 155         kfree(ep);
 156 }
 157
 158 static struct class iscsi_endpoint_class = {
 159         .name = "iscsi_endpoint",
 160         .dev_release = iscsi_endpoint_release,
 161 };
 162
 163 static ssize_t
 164 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 165 {
 166         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 167         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 168 }
 169 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 170
 171 static struct attribute *iscsi_endpoint_attrs[] = {
 172         &dev_attr_ep_handle.attr,
 173         NULL,
 174 };
 175
 176 static struct attribute_group iscsi_endpoint_group = {
 177         .attrs = iscsi_endpoint_attrs,
 178 };
 179
 180 #define ISCSI_MAX_EPID -1
 181
 182 static int iscsi_match_epid(struct device *dev, void *data)
 183 {
 184         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 185         uint64_t *epid = (uint64_t *) data;
 186
 187         return *epid == ep->id;
 188 }
 189
 190 struct iscsi_endpoint *
 191 iscsi_create_endpoint(int dd_size)
 192 {
 193         struct device *dev;
 194         struct iscsi_endpoint *ep;
 195         uint64_t id;
 196         int err;
 197
 198         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 199                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 200                                         iscsi_match_epid);
 201                 if (!dev)
 202                         break;
 203         }
 204         if (id == ISCSI_MAX_EPID) {
 205                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 206                        ISCSI_MAX_EPID - 1);
 207                 return NULL;
 208         }
 209
 210         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 211         if (!ep)
 212                 return NULL;
 213
 214         ep->id = id;
 215         ep->dev.class = &iscsi_endpoint_class;
 216         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 217         err = device_register(&ep->dev);
 218         if (err)
 219                 goto free_ep;
 220
 221         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 222         if (err)
 223                 goto unregister_dev;
 224
 225         if (dd_size)
 226                 ep->dd_data = &ep[1];
 227         return ep;
 228
 229 unregister_dev:
 230         device_unregister(&ep->dev);
 231         return NULL;
 232
 233 free_ep:
 234         kfree(ep);
 235         return NULL;
 236 }
 237 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 238
 239 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 240 {
 241         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 242         device_unregister(&ep->dev);
 243 }
 244 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 245
 246 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 247 {
 248         struct iscsi_endpoint *ep;
 249         struct device *dev;
 250
 251         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 252                                 iscsi_match_epid);
 253         if (!dev)
 254                 return NULL;
 255
 256         ep = iscsi_dev_to_endpoint(dev);
 257         /*
 258          * we can drop this now because the interface will prevent
 259          * removals and lookups from racing.
 260          */
 261         put_device(dev);
 262         return ep;
 263 }
 264 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 265
 266 /*
 267  * Interface to display network param to sysfs
 268  */
 269
 270 static void iscsi_iface_release(struct device *dev)
 271 {
 272         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 273         struct device *parent = iface->dev.parent;
 274
 275         kfree(iface);
 276         put_device(parent);
 277 }
 278
 279
 280 static struct class iscsi_iface_class = {
 281         .name = "iscsi_iface",
 282         .dev_release = iscsi_iface_release,
 283 };
 284
 285 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 286 struct device_attribute dev_attr_##_prefix##_##_name =          \
 287         __ATTR(_name, _mode, _show, _store)
 288
 289 /* iface attrs show */
 290 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 291 static ssize_t                                                          \
 292 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 293                      char *buf)                                         \
 294 {                                                                       \
 295         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 296         struct iscsi_transport *t = iface->transport;                   \
 297         return t->get_iface_param(iface, param_type, param, buf);       \
 298 }                                                                       \
 299
 300 #define iscsi_iface_net_attr(type, name, param)                         \
 301         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 302 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 303
 304 /* generic read only ipvi4 attribute */
 305 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 306 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 307 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 308 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 309
 310 /* generic read only ipv6 attribute */
 311 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 312 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 313 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 314 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 315                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 316 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
 317                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 318
 319 /* common read only iface attribute */
 320 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 321 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
 322 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 323 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 324
 325 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 326                                           struct attribute *attr, int i)
 327 {
 328         struct device *dev = container_of(kobj, struct device, kobj);
 329         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 330         struct iscsi_transport *t = iface->transport;
 331         int param;
 332
 333         if (attr == &dev_attr_iface_enabled.attr)
 334                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 335         else if (attr == &dev_attr_iface_vlan.attr)
 336                 param = ISCSI_NET_PARAM_VLAN_ID;
 337         else if (attr == &dev_attr_iface_vlan_priority.attr)
 338                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 339         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 340                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 341         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 342                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 343                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 344                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 345                         param = ISCSI_NET_PARAM_IPV4_GW;
 346                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 347                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 348                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 349                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 350                 else
 351                         return 0;
 352         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 353                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 354                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 355                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 356                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 357                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 358                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 359                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 360                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 361                 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
 362                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 363                 else
 364                         return 0;
 365         } else {
 366                 WARN_ONCE(1, "Invalid iface attr");
 367                 return 0;
 368         }
 369
 370         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 371 }
 372
 373 static struct attribute *iscsi_iface_attrs[] = {
 374         &dev_attr_iface_enabled.attr,
 375         &dev_attr_iface_vlan.attr,
 376         &dev_attr_iface_vlan_priority.attr,
 377         &dev_attr_iface_vlan_enabled.attr,
 378         &dev_attr_ipv4_iface_ipaddress.attr,
 379         &dev_attr_ipv4_iface_gateway.attr,
 380         &dev_attr_ipv4_iface_subnet.attr,
 381         &dev_attr_ipv4_iface_bootproto.attr,
 382         &dev_attr_ipv6_iface_ipaddress.attr,
 383         &dev_attr_ipv6_iface_link_local_addr.attr,
 384         &dev_attr_ipv6_iface_router_addr.attr,
 385         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 386         &dev_attr_ipv6_iface_linklocal_autocfg.attr,
 387         NULL,
 388 };
 389
 390 static struct attribute_group iscsi_iface_group = {
 391         .attrs = iscsi_iface_attrs,
 392         .is_visible = iscsi_iface_attr_is_visible,
 393 };
 394
 395 struct iscsi_iface *
 396 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 397                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 398 {
 399         struct iscsi_iface *iface;
 400         int err;
 401
 402         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 403         if (!iface)
 404                 return NULL;
 405
 406         iface->transport = transport;
 407         iface->iface_type = iface_type;
 408         iface->iface_num = iface_num;
 409         iface->dev.release = iscsi_iface_release;
 410         iface->dev.class = &iscsi_iface_class;
 411         /* parent reference released in iscsi_iface_release */
 412         iface->dev.parent = get_device(&shost->shost_gendev);
 413         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 414                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 415                              iface_num);
 416         else
 417                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 418                              iface_num);
 419
 420         err = device_register(&iface->dev);
 421         if (err)
 422                 goto free_iface;
 423
 424         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 425         if (err)
 426                 goto unreg_iface;
 427
 428         if (dd_size)
 429                 iface->dd_data = &iface[1];
 430         return iface;
 431
 432 unreg_iface:
 433         device_unregister(&iface->dev);
 434         return NULL;
 435
 436 free_iface:
 437         put_device(iface->dev.parent);
 438         kfree(iface);
 439         return NULL;
 440 }
 441 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 442
 443 void iscsi_destroy_iface(struct iscsi_iface *iface)
 444 {
 445         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 446         device_unregister(&iface->dev);
 447 }
 448 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 449
 450 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 451                             struct device *cdev)
 452 {
 453         struct Scsi_Host *shost = dev_to_shost(dev);
 454         struct iscsi_cls_host *ihost = shost->shost_data;
 455
 456         memset(ihost, 0, sizeof(*ihost));
 457         atomic_set(&ihost->nr_scans, 0);
 458         mutex_init(&ihost->mutex);
 459         return 0;
 460 }
 461
 462 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 463                                "iscsi_host",
 464                                iscsi_setup_host,
 465                                NULL,
 466                                NULL);
 467
 468 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 469                                "iscsi_session",
 470                                NULL,
 471                                NULL,
 472                                NULL);
 473
 474 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 475                                "iscsi_connection",
 476                                NULL,
 477                                NULL,
 478                                NULL);
 479
 480 static struct sock *nls;
 481 static DEFINE_MUTEX(rx_queue_mutex);
 482
 483 static LIST_HEAD(sesslist);
 484 static DEFINE_SPINLOCK(sesslock);
 485 static LIST_HEAD(connlist);
 486 static DEFINE_SPINLOCK(connlock);
 487
 488 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 489 {
 490         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 491         return sess->sid;
 492 }
 493
 494 /*
 495  * Returns the matching session to a given sid
 496  */
 497 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 498 {
 499         unsigned long flags;
 500         struct iscsi_cls_session *sess;
 501
 502         spin_lock_irqsave(&sesslock, flags);
 503         list_for_each_entry(sess, &sesslist, sess_list) {
 504                 if (sess->sid == sid) {
 505                         spin_unlock_irqrestore(&sesslock, flags);
 506                         return sess;
 507                 }
 508         }
 509         spin_unlock_irqrestore(&sesslock, flags);
 510         return NULL;
 511 }
 512
 513 /*
 514  * Returns the matching connection to a given sid / cid tuple
 515  */
 516 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 517 {
 518         unsigned long flags;
 519         struct iscsi_cls_conn *conn;
 520
 521         spin_lock_irqsave(&connlock, flags);
 522         list_for_each_entry(conn, &connlist, conn_list) {
 523                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 524                         spin_unlock_irqrestore(&connlock, flags);
 525                         return conn;
 526                 }
 527         }
 528         spin_unlock_irqrestore(&connlock, flags);
 529         return NULL;
 530 }
 531
 532 /*
 533  * The following functions can be used by LLDs that allocate
 534  * their own scsi_hosts or by software iscsi LLDs
 535  */
 536 static struct {
 537         int value;
 538         char *name;
 539 } iscsi_session_state_names[] = {
 540         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 541         { ISCSI_SESSION_FAILED,         "FAILED" },
 542         { ISCSI_SESSION_FREE,           "FREE" },
 543 };
 544
 545 static const char *iscsi_session_state_name(int state)
 546 {
 547         int i;
 548         char *name = NULL;
 549
 550         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 551                 if (iscsi_session_state_names[i].value == state) {
 552                         name = iscsi_session_state_names[i].name;
 553                         break;
 554                 }
 555         }
 556         return name;
 557 }
 558
 559 int iscsi_session_chkready(struct iscsi_cls_session *session)
 560 {
 561         unsigned long flags;
 562         int err;
 563
 564         spin_lock_irqsave(&session->lock, flags);
 565         switch (session->state) {
 566         case ISCSI_SESSION_LOGGED_IN:
 567                 err = 0;
 568                 break;
 569         case ISCSI_SESSION_FAILED:
 570                 err = DID_IMM_RETRY << 16;
 571                 break;
 572         case ISCSI_SESSION_FREE:
 573                 err = DID_TRANSPORT_FAILFAST << 16;
 574                 break;
 575         default:
 576                 err = DID_NO_CONNECT << 16;
 577                 break;
 578         }
 579         spin_unlock_irqrestore(&session->lock, flags);
 580         return err;
 581 }
 582 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 583
 584 static void iscsi_session_release(struct device *dev)
 585 {
 586         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 587         struct Scsi_Host *shost;
 588
 589         shost = iscsi_session_to_shost(session);
 590         scsi_host_put(shost);
 591         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 592         kfree(session);
 593 }
 594
 595 static int iscsi_is_session_dev(const struct device *dev)
 596 {
 597         return dev->release == iscsi_session_release;
 598 }
 599
 600 static int iscsi_iter_session_fn(struct device *dev, void *data)
 601 {
 602         void (* fn) (struct iscsi_cls_session *) = data;
 603
 604         if (!iscsi_is_session_dev(dev))
 605                 return 0;
 606         fn(iscsi_dev_to_session(dev));
 607         return 0;
 608 }
 609
 610 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 611                                  void (*fn)(struct iscsi_cls_session *))
 612 {
 613         device_for_each_child(&shost->shost_gendev, fn,
 614                               iscsi_iter_session_fn);
 615 }
 616 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 617
 618 /**
 619  * iscsi_scan_finished - helper to report when running scans are done
 620  * @shost: scsi host
 621  * @time: scan run time
 622  *
 623  * This function can be used by drives like qla4xxx to report to the scsi
 624  * layer when the scans it kicked off at module load time are done.
 625  */
 626 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 627 {
 628         struct iscsi_cls_host *ihost = shost->shost_data;
 629         /*
 630          * qla4xxx will have kicked off some session unblocks before calling
 631          * scsi_scan_host, so just wait for them to complete.
 632          */
 633         return !atomic_read(&ihost->nr_scans);
 634 }
 635 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 636
 637 struct iscsi_scan_data {
 638         unsigned int channel;
 639         unsigned int id;
 640         unsigned int lun;
 641 };
 642
 643 static int iscsi_user_scan_session(struct device *dev, void *data)
 644 {
 645         struct iscsi_scan_data *scan_data = data;
 646         struct iscsi_cls_session *session;
 647         struct Scsi_Host *shost;
 648         struct iscsi_cls_host *ihost;
 649         unsigned long flags;
 650         unsigned int id;
 651
 652         if (!iscsi_is_session_dev(dev))
 653                 return 0;
 654
 655         session = iscsi_dev_to_session(dev);
 656
 657         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 658
 659         shost = iscsi_session_to_shost(session);
 660         ihost = shost->shost_data;
 661
 662         mutex_lock(&ihost->mutex);
 663         spin_lock_irqsave(&session->lock, flags);
 664         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 665                 spin_unlock_irqrestore(&session->lock, flags);
 666                 goto user_scan_exit;
 667         }
 668         id = session->target_id;
 669         spin_unlock_irqrestore(&session->lock, flags);
 670
 671         if (id != ISCSI_MAX_TARGET) {
 672                 if ((scan_data->channel == SCAN_WILD_CARD ||
 673                      scan_data->channel == 0) &&
 674                     (scan_data->id == SCAN_WILD_CARD ||
 675                      scan_data->id == id))
 676                         scsi_scan_target(&session->dev, 0, id,
 677                                          scan_data->lun, 1);
 678         }
 679
 680 user_scan_exit:
 681         mutex_unlock(&ihost->mutex);
 682         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 683         return 0;
 684 }
 685
 686 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 687                            uint id, uint lun)
 688 {
 689         struct iscsi_scan_data scan_data;
 690
 691         scan_data.channel = channel;
 692         scan_data.id = id;
 693         scan_data.lun = lun;
 694
 695         return device_for_each_child(&shost->shost_gendev, &scan_data,
 696                                      iscsi_user_scan_session);
 697 }
 698
 699 static void iscsi_scan_session(struct work_struct *work)
 700 {
 701         struct iscsi_cls_session *session =
 702                         container_of(work, struct iscsi_cls_session, scan_work);
 703         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 704         struct iscsi_cls_host *ihost = shost->shost_data;
 705         struct iscsi_scan_data scan_data;
 706
 707         scan_data.channel = 0;
 708         scan_data.id = SCAN_WILD_CARD;
 709         scan_data.lun = SCAN_WILD_CARD;
 710
 711         iscsi_user_scan_session(&session->dev, &scan_data);
 712         atomic_dec(&ihost->nr_scans);
 713 }
 714
 715 /**
 716  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 717  * @cmd: scsi cmd passed to scsi eh handler
 718  *
 719  * If the session is down this function will wait for the recovery
 720  * timer to fire or for the session to be logged back in. If the
 721  * recovery timer fires then FAST_IO_FAIL is returned. The caller
 722  * should pass this error value to the scsi eh.
 723  */
 724 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 725 {
 726         struct iscsi_cls_session *session =
 727                         starget_to_session(scsi_target(cmd->device));
 728         unsigned long flags;
 729         int ret = 0;
 730
 731         spin_lock_irqsave(&session->lock, flags);
 732         while (session->state != ISCSI_SESSION_LOGGED_IN) {
 733                 if (session->state == ISCSI_SESSION_FREE) {
 734                         ret = FAST_IO_FAIL;
 735                         break;
 736                 }
 737                 spin_unlock_irqrestore(&session->lock, flags);
 738                 msleep(1000);
 739                 spin_lock_irqsave(&session->lock, flags);
 740         }
 741         spin_unlock_irqrestore(&session->lock, flags);
 742         return ret;
 743 }
 744 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 745
 746 static void session_recovery_timedout(struct work_struct *work)
 747 {
 748         struct iscsi_cls_session *session =
 749                 container_of(work, struct iscsi_cls_session,
 750                              recovery_work.work);
 751         unsigned long flags;
 752
 753         iscsi_cls_session_printk(KERN_INFO, session,
 754                                  "session recovery timed out after %d secs\n",
 755                                  session->recovery_tmo);
 756
 757         spin_lock_irqsave(&session->lock, flags);
 758         switch (session->state) {
 759         case ISCSI_SESSION_FAILED:
 760                 session->state = ISCSI_SESSION_FREE;
 761                 break;
 762         case ISCSI_SESSION_LOGGED_IN:
 763         case ISCSI_SESSION_FREE:
 764                 /* we raced with the unblock's flush */
 765                 spin_unlock_irqrestore(&session->lock, flags);
 766                 return;
 767         }
 768         spin_unlock_irqrestore(&session->lock, flags);
 769
 770         if (session->transport->session_recovery_timedout)
 771                 session->transport->session_recovery_timedout(session);
 772
 773         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 774         scsi_target_unblock(&session->dev);
 775         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 776 }
 777
 778 static void __iscsi_unblock_session(struct work_struct *work)
 779 {
 780         struct iscsi_cls_session *session =
 781                         container_of(work, struct iscsi_cls_session,
 782                                      unblock_work);
 783         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 784         struct iscsi_cls_host *ihost = shost->shost_data;
 785         unsigned long flags;
 786
 787         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 788         /*
 789          * The recovery and unblock work get run from the same workqueue,
 790          * so try to cancel it if it was going to run after this unblock.
 791          */
 792         cancel_delayed_work(&session->recovery_work);
 793         spin_lock_irqsave(&session->lock, flags);
 794         session->state = ISCSI_SESSION_LOGGED_IN;
 795         spin_unlock_irqrestore(&session->lock, flags);
 796         /* start IO */
 797         scsi_target_unblock(&session->dev);
 798         /*
 799          * Only do kernel scanning if the driver is properly hooked into
 800          * the async scanning code (drivers like iscsi_tcp do login and
 801          * scanning from userspace).
 802          */
 803         if (shost->hostt->scan_finished) {
 804                 if (scsi_queue_work(shost, &session->scan_work))
 805                         atomic_inc(&ihost->nr_scans);
 806         }
 807         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 808 }
 809
 810 /**
 811  * iscsi_unblock_session - set a session as logged in and start IO.
 812  * @session: iscsi session
 813  *
 814  * Mark a session as ready to accept IO.
 815  */
 816 void iscsi_unblock_session(struct iscsi_cls_session *session)
 817 {
 818         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 819         /*
 820          * make sure all the events have completed before tell the driver
 821          * it is safe
 822          */
 823         flush_workqueue(iscsi_eh_timer_workq);
 824 }
 825 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 826
 827 static void __iscsi_block_session(struct work_struct *work)
 828 {
 829         struct iscsi_cls_session *session =
 830                         container_of(work, struct iscsi_cls_session,
 831                                      block_work);
 832         unsigned long flags;
 833
 834         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 835         spin_lock_irqsave(&session->lock, flags);
 836         session->state = ISCSI_SESSION_FAILED;
 837         spin_unlock_irqrestore(&session->lock, flags);
 838         scsi_target_block(&session->dev);
 839         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 840         if (session->recovery_tmo >= 0)
 841                 queue_delayed_work(iscsi_eh_timer_workq,
 842                                    &session->recovery_work,
 843                                    session->recovery_tmo * HZ);
 844 }
 845
 846 void iscsi_block_session(struct iscsi_cls_session *session)
 847 {
 848         queue_work(iscsi_eh_timer_workq, &session->block_work);
 849 }
 850 EXPORT_SYMBOL_GPL(iscsi_block_session);
 851
 852 static void __iscsi_unbind_session(struct work_struct *work)
 853 {
 854         struct iscsi_cls_session *session =
 855                         container_of(work, struct iscsi_cls_session,
 856                                      unbind_work);
 857         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 858         struct iscsi_cls_host *ihost = shost->shost_data;
 859         unsigned long flags;
 860
 861         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 862
 863         /* Prevent new scans and make sure scanning is not in progress */
 864         mutex_lock(&ihost->mutex);
 865         spin_lock_irqsave(&session->lock, flags);
 866         if (session->target_id == ISCSI_MAX_TARGET) {
 867                 spin_unlock_irqrestore(&session->lock, flags);
 868                 mutex_unlock(&ihost->mutex);
 869                 return;
 870         }
 871         session->target_id = ISCSI_MAX_TARGET;
 872         spin_unlock_irqrestore(&session->lock, flags);
 873         mutex_unlock(&ihost->mutex);
 874
 875         scsi_remove_target(&session->dev);
 876         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
 877         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
 878 }
 879
 880 struct iscsi_cls_session *
 881 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 882                     int dd_size)
 883 {
 884         struct iscsi_cls_session *session;
 885
 886         session = kzalloc(sizeof(*session) + dd_size,
 887                           GFP_KERNEL);
 888         if (!session)
 889                 return NULL;
 890
 891         session->transport = transport;
 892         session->recovery_tmo = 120;
 893         session->state = ISCSI_SESSION_FREE;
 894         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
 895         INIT_LIST_HEAD(&session->sess_list);
 896         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
 897         INIT_WORK(&session->block_work, __iscsi_block_session);
 898         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
 899         INIT_WORK(&session->scan_work, iscsi_scan_session);
 900         spin_lock_init(&session->lock);
 901
 902         /* this is released in the dev's release function */
 903         scsi_host_get(shost);
 904         session->dev.parent = &shost->shost_gendev;
 905         session->dev.release = iscsi_session_release;
 906         device_initialize(&session->dev);
 907         if (dd_size)
 908                 session->dd_data = &session[1];
 909
 910         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
 911         return session;
 912 }
 913 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 914
 915 static int iscsi_get_next_target_id(struct device *dev, void *data)
 916 {
 917         struct iscsi_cls_session *session;
 918         unsigned long flags;
 919         int err = 0;
 920
 921         if (!iscsi_is_session_dev(dev))
 922                 return 0;
 923
 924         session = iscsi_dev_to_session(dev);
 925         spin_lock_irqsave(&session->lock, flags);
 926         if (*((unsigned int *) data) == session->target_id)
 927                 err = -EEXIST;
 928         spin_unlock_irqrestore(&session->lock, flags);
 929         return err;
 930 }
 931
 932 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 933 {
 934         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 935         struct iscsi_cls_host *ihost;
 936         unsigned long flags;
 937         unsigned int id = target_id;
 938         int err;
 939
 940         ihost = shost->shost_data;
 941         session->sid = atomic_add_return(1, &iscsi_session_nr);
 942
 943         if (id == ISCSI_MAX_TARGET) {
 944                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
 945                         err = device_for_each_child(&shost->shost_gendev, &id,
 946                                                     iscsi_get_next_target_id);
 947                         if (!err)
 948                                 break;
 949                 }
 950
 951                 if (id == ISCSI_MAX_TARGET) {
 952                         iscsi_cls_session_printk(KERN_ERR, session,
 953                                                  "Too many iscsi targets. Max "
 954                                                  "number of targets is %d.\n",
 955                                                  ISCSI_MAX_TARGET - 1);
 956                         err = -EOVERFLOW;
 957                         goto release_host;
 958                 }
 959         }
 960         session->target_id = id;
 961
 962         dev_set_name(&session->dev, "session%u", session->sid);
 963         err = device_add(&session->dev);
 964         if (err) {
 965                 iscsi_cls_session_printk(KERN_ERR, session,
 966                                          "could not register session's dev\n");
 967                 goto release_host;
 968         }
 969         transport_register_device(&session->dev);
 970
 971         spin_lock_irqsave(&sesslock, flags);
 972         list_add(&session->sess_list, &sesslist);
 973         spin_unlock_irqrestore(&sesslock, flags);
 974
 975         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
 976         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
 977         return 0;
 978
 979 release_host:
 980         scsi_host_put(shost);
 981         return err;
 982 }
 983 EXPORT_SYMBOL_GPL(iscsi_add_session);
 984
 985 /**
 986  * iscsi_create_session - create iscsi class session
 987  * @shost: scsi host
 988  * @transport: iscsi transport
 989  * @dd_size: private driver data size
 990  * @target_id: which target
 991  *
 992  * This can be called from a LLD or iscsi_transport.
 993  */
 994 struct iscsi_cls_session *
 995 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 996                      int dd_size, unsigned int target_id)
 997 {
 998         struct iscsi_cls_session *session;
 999
1000         session = iscsi_alloc_session(shost, transport, dd_size);
1001         if (!session)
1002                 return NULL;
1003
1004         if (iscsi_add_session(session, target_id)) {
1005                 iscsi_free_session(session);
1006                 return NULL;
1007         }
1008         return session;
1009 }
1010 EXPORT_SYMBOL_GPL(iscsi_create_session);
1011
1012 static void iscsi_conn_release(struct device *dev)
1013 {
1014         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1015         struct device *parent = conn->dev.parent;
1016
1017         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1018         kfree(conn);
1019         put_device(parent);
1020 }
1021
1022 static int iscsi_is_conn_dev(const struct device *dev)
1023 {
1024         return dev->release == iscsi_conn_release;
1025 }
1026
1027 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1028 {
1029         if (!iscsi_is_conn_dev(dev))
1030                 return 0;
1031         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1032 }
1033
1034 void iscsi_remove_session(struct iscsi_cls_session *session)
1035 {
1036         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1037         unsigned long flags;
1038         int err;
1039
1040         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1041
1042         spin_lock_irqsave(&sesslock, flags);
1043         list_del(&session->sess_list);
1044         spin_unlock_irqrestore(&sesslock, flags);
1045
1046         /* make sure there are no blocks/unblocks queued */
1047         flush_workqueue(iscsi_eh_timer_workq);
1048         /* make sure the timedout callout is not running */
1049         if (!cancel_delayed_work(&session->recovery_work))
1050                 flush_workqueue(iscsi_eh_timer_workq);
1051         /*
1052          * If we are blocked let commands flow again. The lld or iscsi
1053          * layer should set up the queuecommand to fail commands.
1054          * We assume that LLD will not be calling block/unblock while
1055          * removing the session.
1056          */
1057         spin_lock_irqsave(&session->lock, flags);
1058         session->state = ISCSI_SESSION_FREE;
1059         spin_unlock_irqrestore(&session->lock, flags);
1060
1061         scsi_target_unblock(&session->dev);
1062         /* flush running scans then delete devices */
1063         scsi_flush_work(shost);
1064         __iscsi_unbind_session(&session->unbind_work);
1065
1066         /* hw iscsi may not have removed all connections from session */
1067         err = device_for_each_child(&session->dev, NULL,
1068                                     iscsi_iter_destroy_conn_fn);
1069         if (err)
1070                 iscsi_cls_session_printk(KERN_ERR, session,
1071                                          "Could not delete all connections "
1072                                          "for session. Error %d.\n", err);
1073
1074         transport_unregister_device(&session->dev);
1075
1076         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1077         device_del(&session->dev);
1078 }
1079 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1080
1081 void iscsi_free_session(struct iscsi_cls_session *session)
1082 {
1083         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1084         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1085         put_device(&session->dev);
1086 }
1087 EXPORT_SYMBOL_GPL(iscsi_free_session);
1088
1089 /**
1090  * iscsi_destroy_session - destroy iscsi session
1091  * @session: iscsi_session
1092  *
1093  * Can be called by a LLD or iscsi_transport. There must not be
1094  * any running connections.
1095  */
1096 int iscsi_destroy_session(struct iscsi_cls_session *session)
1097 {
1098         iscsi_remove_session(session);
1099         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1100         iscsi_free_session(session);
1101         return 0;
1102 }
1103 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1104
1105 /**
1106  * iscsi_create_conn - create iscsi class connection
1107  * @session: iscsi cls session
1108  * @dd_size: private driver data size
1109  * @cid: connection id
1110  *
1111  * This can be called from a LLD or iscsi_transport. The connection
1112  * is child of the session so cid must be unique for all connections
1113  * on the session.
1114  *
1115  * Since we do not support MCS, cid will normally be zero. In some cases
1116  * for software iscsi we could be trying to preallocate a connection struct
1117  * in which case there could be two connection structs and cid would be
1118  * non-zero.
1119  */
1120 struct iscsi_cls_conn *
1121 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1122 {
1123         struct iscsi_transport *transport = session->transport;
1124         struct iscsi_cls_conn *conn;
1125         unsigned long flags;
1126         int err;
1127
1128         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1129         if (!conn)
1130                 return NULL;
1131         if (dd_size)
1132                 conn->dd_data = &conn[1];
1133
1134         mutex_init(&conn->ep_mutex);
1135         INIT_LIST_HEAD(&conn->conn_list);
1136         conn->transport = transport;
1137         conn->cid = cid;
1138
1139         /* this is released in the dev's release function */
1140         if (!get_device(&session->dev))
1141                 goto free_conn;
1142
1143         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1144         conn->dev.parent = &session->dev;
1145         conn->dev.release = iscsi_conn_release;
1146         err = device_register(&conn->dev);
1147         if (err) {
1148                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1149                                          "register connection's dev\n");
1150                 goto release_parent_ref;
1151         }
1152         transport_register_device(&conn->dev);
1153
1154         spin_lock_irqsave(&connlock, flags);
1155         list_add(&conn->conn_list, &connlist);
1156         spin_unlock_irqrestore(&connlock, flags);
1157
1158         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1159         return conn;
1160
1161 release_parent_ref:
1162         put_device(&session->dev);
1163 free_conn:
1164         kfree(conn);
1165         return NULL;
1166 }
1167
1168 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1169
1170 /**
1171  * iscsi_destroy_conn - destroy iscsi class connection
1172  * @conn: iscsi cls session
1173  *
1174  * This can be called from a LLD or iscsi_transport.
1175  */
1176 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1177 {
1178         unsigned long flags;
1179
1180         spin_lock_irqsave(&connlock, flags);
1181         list_del(&conn->conn_list);
1182         spin_unlock_irqrestore(&connlock, flags);
1183
1184         transport_unregister_device(&conn->dev);
1185         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1186         device_unregister(&conn->dev);
1187         return 0;
1188 }
1189 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1190
1191 /*
1192  * iscsi interface functions
1193  */
1194 static struct iscsi_internal *
1195 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1196 {
1197         struct iscsi_internal *priv;
1198         unsigned long flags;
1199
1200         spin_lock_irqsave(&iscsi_transport_lock, flags);
1201         list_for_each_entry(priv, &iscsi_transports, list) {
1202                 if (tt == priv->iscsi_transport) {
1203                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1204                         return priv;
1205                 }
1206         }
1207         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1208         return NULL;
1209 }
1210
1211 static int
1212 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1213 {
1214         return nlmsg_multicast(nls, skb, 0, group, gfp);
1215 }
1216
1217 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1218                    char *data, uint32_t data_size)
1219 {
1220         struct nlmsghdr *nlh;
1221         struct sk_buff *skb;
1222         struct iscsi_uevent *ev;
1223         char *pdu;
1224         struct iscsi_internal *priv;
1225         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1226                               data_size);
1227
1228         priv = iscsi_if_transport_lookup(conn->transport);
1229         if (!priv)
1230                 return -EINVAL;
1231
1232         skb = alloc_skb(len, GFP_ATOMIC);
1233         if (!skb) {
1234                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1235                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1236                                       "control PDU: OOM\n");
1237                 return -ENOMEM;
1238         }
1239
1240         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1241         ev = NLMSG_DATA(nlh);
1242         memset(ev, 0, sizeof(*ev));
1243         ev->transport_handle = iscsi_handle(conn->transport);
1244         ev->type = ISCSI_KEVENT_RECV_PDU;
1245         ev->r.recv_req.cid = conn->cid;
1246         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1247         pdu = (char*)ev + sizeof(*ev);
1248         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1249         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1250
1251         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1252 }
1253 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1254
1255 int iscsi_offload_mesg(struct Scsi_Host *shost,
1256                        struct iscsi_transport *transport, uint32_t type,
1257                        char *data, uint16_t data_size)
1258 {
1259         struct nlmsghdr *nlh;
1260         struct sk_buff *skb;
1261         struct iscsi_uevent *ev;
1262         int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1263
1264         skb = alloc_skb(len, GFP_ATOMIC);
1265         if (!skb) {
1266                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1267                 return -ENOMEM;
1268         }
1269
1270         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1271         ev = NLMSG_DATA(nlh);
1272         memset(ev, 0, sizeof(*ev));
1273         ev->type = type;
1274         ev->transport_handle = iscsi_handle(transport);
1275         switch (type) {
1276         case ISCSI_KEVENT_PATH_REQ:
1277                 ev->r.req_path.host_no = shost->host_no;
1278                 break;
1279         case ISCSI_KEVENT_IF_DOWN:
1280                 ev->r.notify_if_down.host_no = shost->host_no;
1281                 break;
1282         }
1283
1284         memcpy((char *)ev + sizeof(*ev), data, data_size);
1285
1286         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1287 }
1288 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1289
1290 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1291 {
1292         struct nlmsghdr *nlh;
1293         struct sk_buff  *skb;
1294         struct iscsi_uevent *ev;
1295         struct iscsi_internal *priv;
1296         int len = NLMSG_SPACE(sizeof(*ev));
1297
1298         priv = iscsi_if_transport_lookup(conn->transport);
1299         if (!priv)
1300                 return;
1301
1302         skb = alloc_skb(len, GFP_ATOMIC);
1303         if (!skb) {
1304                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1305                                       "conn error (%d)\n", error);
1306                 return;
1307         }
1308
1309         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1310         ev = NLMSG_DATA(nlh);
1311         ev->transport_handle = iscsi_handle(conn->transport);
1312         ev->type = ISCSI_KEVENT_CONN_ERROR;
1313         ev->r.connerror.error = error;
1314         ev->r.connerror.cid = conn->cid;
1315         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1316
1317         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1318
1319         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1320                               error);
1321 }
1322 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1323
1324 static int
1325 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1326                     void *payload, int size)
1327 {
1328         struct sk_buff  *skb;
1329         struct nlmsghdr *nlh;
1330         int len = NLMSG_SPACE(size);
1331         int flags = multi ? NLM_F_MULTI : 0;
1332         int t = done ? NLMSG_DONE : type;
1333
1334         skb = alloc_skb(len, GFP_ATOMIC);
1335         if (!skb) {
1336                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1337                 return -ENOMEM;
1338         }
1339
1340         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1341         nlh->nlmsg_flags = flags;
1342         memcpy(NLMSG_DATA(nlh), payload, size);
1343         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1344 }
1345
1346 static int
1347 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1348 {
1349         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1350         struct iscsi_stats *stats;
1351         struct sk_buff *skbstat;
1352         struct iscsi_cls_conn *conn;
1353         struct nlmsghdr *nlhstat;
1354         struct iscsi_uevent *evstat;
1355         struct iscsi_internal *priv;
1356         int len = NLMSG_SPACE(sizeof(*ev) +
1357                               sizeof(struct iscsi_stats) +
1358                               sizeof(struct iscsi_stats_custom) *
1359                               ISCSI_STATS_CUSTOM_MAX);
1360         int err = 0;
1361
1362         priv = iscsi_if_transport_lookup(transport);
1363         if (!priv)
1364                 return -EINVAL;
1365
1366         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1367         if (!conn)
1368                 return -EEXIST;
1369
1370         do {
1371                 int actual_size;
1372
1373                 skbstat = alloc_skb(len, GFP_ATOMIC);
1374                 if (!skbstat) {
1375                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1376                                               "deliver stats: OOM\n");
1377                         return -ENOMEM;
1378                 }
1379
1380                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1381                                       (len - sizeof(*nlhstat)), 0);
1382                 evstat = NLMSG_DATA(nlhstat);
1383                 memset(evstat, 0, sizeof(*evstat));
1384                 evstat->transport_handle = iscsi_handle(conn->transport);
1385                 evstat->type = nlh->nlmsg_type;
1386                 evstat->u.get_stats.cid =
1387                         ev->u.get_stats.cid;
1388                 evstat->u.get_stats.sid =
1389                         ev->u.get_stats.sid;
1390                 stats = (struct iscsi_stats *)
1391                         ((char*)evstat + sizeof(*evstat));
1392                 memset(stats, 0, sizeof(*stats));
1393
1394                 transport->get_stats(conn, stats);
1395                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1396                                           sizeof(struct iscsi_stats) +
1397                                           sizeof(struct iscsi_stats_custom) *
1398                                           stats->custom_length);
1399                 actual_size -= sizeof(*nlhstat);
1400                 actual_size = NLMSG_LENGTH(actual_size);
1401                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1402                 nlhstat->nlmsg_len = actual_size;
1403
1404                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1405                                           GFP_ATOMIC);
1406         } while (err < 0 && err != -ECONNREFUSED);
1407
1408         return err;
1409 }
1410
1411 /**
1412  * iscsi_session_event - send session destr. completion event
1413  * @session: iscsi class session
1414  * @event: type of event
1415  */
1416 int iscsi_session_event(struct iscsi_cls_session *session,
1417                         enum iscsi_uevent_e event)
1418 {
1419         struct iscsi_internal *priv;
1420         struct Scsi_Host *shost;
1421         struct iscsi_uevent *ev;
1422         struct sk_buff  *skb;
1423         struct nlmsghdr *nlh;
1424         int rc, len = NLMSG_SPACE(sizeof(*ev));
1425
1426         priv = iscsi_if_transport_lookup(session->transport);
1427         if (!priv)
1428                 return -EINVAL;
1429         shost = iscsi_session_to_shost(session);
1430
1431         skb = alloc_skb(len, GFP_KERNEL);
1432         if (!skb) {
1433                 iscsi_cls_session_printk(KERN_ERR, session,
1434                                          "Cannot notify userspace of session "
1435                                          "event %u\n", event);
1436                 return -ENOMEM;
1437         }
1438
1439         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1440         ev = NLMSG_DATA(nlh);
1441         ev->transport_handle = iscsi_handle(session->transport);
1442
1443         ev->type = event;
1444         switch (event) {
1445         case ISCSI_KEVENT_DESTROY_SESSION:
1446                 ev->r.d_session.host_no = shost->host_no;
1447                 ev->r.d_session.sid = session->sid;
1448                 break;
1449         case ISCSI_KEVENT_CREATE_SESSION:
1450                 ev->r.c_session_ret.host_no = shost->host_no;
1451                 ev->r.c_session_ret.sid = session->sid;
1452                 break;
1453         case ISCSI_KEVENT_UNBIND_SESSION:
1454                 ev->r.unbind_session.host_no = shost->host_no;
1455                 ev->r.unbind_session.sid = session->sid;
1456                 break;
1457         default:
1458                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1459                                          "%u.\n", event);
1460                 kfree_skb(skb);
1461                 return -EINVAL;
1462         }
1463
1464         /*
1465          * this will occur if the daemon is not up, so we just warn
1466          * the user and when the daemon is restarted it will handle it
1467          */
1468         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1469         if (rc == -ESRCH)
1470                 iscsi_cls_session_printk(KERN_ERR, session,
1471                                          "Cannot notify userspace of session "
1472                                          "event %u. Check iscsi daemon\n",
1473                                          event);
1474
1475         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1476                                 event, rc);
1477         return rc;
1478 }
1479 EXPORT_SYMBOL_GPL(iscsi_session_event);
1480
1481 static int
1482 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1483                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1484                         uint16_t cmds_max, uint16_t queue_depth)
1485 {
1486         struct iscsi_transport *transport = priv->iscsi_transport;
1487         struct iscsi_cls_session *session;
1488         struct Scsi_Host *shost;
1489
1490         session = transport->create_session(ep, cmds_max, queue_depth,
1491                                             initial_cmdsn);
1492         if (!session)
1493                 return -ENOMEM;
1494
1495         shost = iscsi_session_to_shost(session);
1496         ev->r.c_session_ret.host_no = shost->host_no;
1497         ev->r.c_session_ret.sid = session->sid;
1498         ISCSI_DBG_TRANS_SESSION(session,
1499                                 "Completed creating transport session\n");
1500         return 0;
1501 }
1502
1503 static int
1504 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1505 {
1506         struct iscsi_cls_conn *conn;
1507         struct iscsi_cls_session *session;
1508
1509         session = iscsi_session_lookup(ev->u.c_conn.sid);
1510         if (!session) {
1511                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1512                        ev->u.c_conn.sid);
1513                 return -EINVAL;
1514         }
1515
1516         conn = transport->create_conn(session, ev->u.c_conn.cid);
1517         if (!conn) {
1518                 iscsi_cls_session_printk(KERN_ERR, session,
1519                                          "couldn't create a new connection.");
1520                 return -ENOMEM;
1521         }
1522
1523         ev->r.c_conn_ret.sid = session->sid;
1524         ev->r.c_conn_ret.cid = conn->cid;
1525
1526         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1527         return 0;
1528 }
1529
1530 static int
1531 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1532 {
1533         struct iscsi_cls_conn *conn;
1534
1535         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1536         if (!conn)
1537                 return -EINVAL;
1538
1539         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1540         if (transport->destroy_conn)
1541                 transport->destroy_conn(conn);
1542
1543         return 0;
1544 }
1545
1546 static int
1547 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1548 {
1549         char *data = (char*)ev + sizeof(*ev);
1550         struct iscsi_cls_conn *conn;
1551         struct iscsi_cls_session *session;
1552         int err = 0, value = 0;
1553
1554         session = iscsi_session_lookup(ev->u.set_param.sid);
1555         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1556         if (!conn || !session)
1557                 return -EINVAL;
1558
1559         switch (ev->u.set_param.param) {
1560         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1561                 sscanf(data, "%d", &value);
1562                 session->recovery_tmo = value;
1563                 break;
1564         default:
1565                 err = transport->set_param(conn, ev->u.set_param.param,
1566                                            data, ev->u.set_param.len);
1567         }
1568
1569         return err;
1570 }
1571
1572 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1573                                struct iscsi_uevent *ev, int msg_type)
1574 {
1575         struct iscsi_endpoint *ep;
1576         struct sockaddr *dst_addr;
1577         struct Scsi_Host *shost = NULL;
1578         int non_blocking, err = 0;
1579
1580         if (!transport->ep_connect)
1581                 return -EINVAL;
1582
1583         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1584                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1585                 if (!shost) {
1586                         printk(KERN_ERR "ep connect failed. Could not find "
1587                                "host no %u\n",
1588                                ev->u.ep_connect_through_host.host_no);
1589                         return -ENODEV;
1590                 }
1591                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1592         } else
1593                 non_blocking = ev->u.ep_connect.non_blocking;
1594
1595         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1596         ep = transport->ep_connect(shost, dst_addr, non_blocking);
1597         if (IS_ERR(ep)) {
1598                 err = PTR_ERR(ep);
1599                 goto release_host;
1600         }
1601
1602         ev->r.ep_connect_ret.handle = ep->id;
1603 release_host:
1604         if (shost)
1605                 scsi_host_put(shost);
1606         return err;
1607 }
1608
1609 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1610                                   u64 ep_handle)
1611 {
1612         struct iscsi_cls_conn *conn;
1613         struct iscsi_endpoint *ep;
1614
1615         if (!transport->ep_disconnect)
1616                 return -EINVAL;
1617
1618         ep = iscsi_lookup_endpoint(ep_handle);
1619         if (!ep)
1620                 return -EINVAL;
1621         conn = ep->conn;
1622         if (conn) {
1623                 mutex_lock(&conn->ep_mutex);
1624                 conn->ep = NULL;
1625                 mutex_unlock(&conn->ep_mutex);
1626         }
1627
1628         transport->ep_disconnect(ep);
1629         return 0;
1630 }
1631
1632 static int
1633 iscsi_if_transport_ep(struct iscsi_transport *transport,
1634                       struct iscsi_uevent *ev, int msg_type)
1635 {
1636         struct iscsi_endpoint *ep;
1637         int rc = 0;
1638
1639         switch (msg_type) {
1640         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1641         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1642                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1643                 break;
1644         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1645                 if (!transport->ep_poll)
1646                         return -EINVAL;
1647
1648                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1649                 if (!ep)
1650                         return -EINVAL;
1651
1652                 ev->r.retcode = transport->ep_poll(ep,
1653                                                    ev->u.ep_poll.timeout_ms);
1654                 break;
1655         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1656                 rc = iscsi_if_ep_disconnect(transport,
1657                                             ev->u.ep_disconnect.ep_handle);
1658                 break;
1659         }
1660         return rc;
1661 }
1662
1663 static int
1664 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1665                 struct iscsi_uevent *ev)
1666 {
1667         struct Scsi_Host *shost;
1668         struct sockaddr *dst_addr;
1669         int err;
1670
1671         if (!transport->tgt_dscvr)
1672                 return -EINVAL;
1673
1674         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1675         if (!shost) {
1676                 printk(KERN_ERR "target discovery could not find host no %u\n",
1677                        ev->u.tgt_dscvr.host_no);
1678                 return -ENODEV;
1679         }
1680
1681
1682         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1683         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1684                                    ev->u.tgt_dscvr.enable, dst_addr);
1685         scsi_host_put(shost);
1686         return err;
1687 }
1688
1689 static int
1690 iscsi_set_host_param(struct iscsi_transport *transport,
1691                      struct iscsi_uevent *ev)
1692 {
1693         char *data = (char*)ev + sizeof(*ev);
1694         struct Scsi_Host *shost;
1695         int err;
1696
1697         if (!transport->set_host_param)
1698                 return -ENOSYS;
1699
1700         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1701         if (!shost) {
1702                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1703                        ev->u.set_host_param.host_no);
1704                 return -ENODEV;
1705         }
1706
1707         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1708                                         data, ev->u.set_host_param.len);
1709         scsi_host_put(shost);
1710         return err;
1711 }
1712
1713 static int
1714 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1715 {
1716         struct Scsi_Host *shost;
1717         struct iscsi_path *params;
1718         int err;
1719
1720         if (!transport->set_path)
1721                 return -ENOSYS;
1722
1723         shost = scsi_host_lookup(ev->u.set_path.host_no);
1724         if (!shost) {
1725                 printk(KERN_ERR "set path could not find host no %u\n",
1726                        ev->u.set_path.host_no);
1727                 return -ENODEV;
1728         }
1729
1730         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1731         err = transport->set_path(shost, params);
1732
1733         scsi_host_put(shost);
1734         return err;
1735 }
1736
1737 static int
1738 iscsi_set_iface_params(struct iscsi_transport *transport,
1739                        struct iscsi_uevent *ev)
1740 {
1741         char *data = (char *)ev + sizeof(*ev);
1742         struct Scsi_Host *shost;
1743         int err;
1744
1745         if (!transport->set_iface_param)
1746                 return -ENOSYS;
1747
1748         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1749         if (!shost) {
1750                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1751                        ev->u.set_iface_params.host_no);
1752                 return -ENODEV;
1753         }
1754
1755         err = transport->set_iface_param(shost, data,
1756                                          ev->u.set_iface_params.count);
1757         scsi_host_put(shost);
1758         return err;
1759 }
1760
1761 static int
1762 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1763 {
1764         int err = 0;
1765         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1766         struct iscsi_transport *transport = NULL;
1767         struct iscsi_internal *priv;
1768         struct iscsi_cls_session *session;
1769         struct iscsi_cls_conn *conn;
1770         struct iscsi_endpoint *ep = NULL;
1771
1772         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1773                 *group = ISCSI_NL_GRP_UIP;
1774         else
1775                 *group = ISCSI_NL_GRP_ISCSID;
1776
1777         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1778         if (!priv)
1779                 return -EINVAL;
1780         transport = priv->iscsi_transport;
1781
1782         if (!try_module_get(transport->owner))
1783                 return -EINVAL;
1784
1785         switch (nlh->nlmsg_type) {
1786         case ISCSI_UEVENT_CREATE_SESSION:
1787                 err = iscsi_if_create_session(priv, ep, ev,
1788                                               ev->u.c_session.initial_cmdsn,
1789                                               ev->u.c_session.cmds_max,
1790                                               ev->u.c_session.queue_depth);
1791                 break;
1792         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1793                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1794                 if (!ep) {
1795                         err = -EINVAL;
1796                         break;
1797                 }
1798
1799                 err = iscsi_if_create_session(priv, ep, ev,
1800                                         ev->u.c_bound_session.initial_cmdsn,
1801                                         ev->u.c_bound_session.cmds_max,
1802                                         ev->u.c_bound_session.queue_depth);
1803                 break;
1804         case ISCSI_UEVENT_DESTROY_SESSION:
1805                 session = iscsi_session_lookup(ev->u.d_session.sid);
1806                 if (session)
1807                         transport->destroy_session(session);
1808                 else
1809                         err = -EINVAL;
1810                 break;
1811         case ISCSI_UEVENT_UNBIND_SESSION:
1812                 session = iscsi_session_lookup(ev->u.d_session.sid);
1813                 if (session)
1814                         scsi_queue_work(iscsi_session_to_shost(session),
1815                                         &session->unbind_work);
1816                 else
1817                         err = -EINVAL;
1818                 break;
1819         case ISCSI_UEVENT_CREATE_CONN:
1820                 err = iscsi_if_create_conn(transport, ev);
1821                 break;
1822         case ISCSI_UEVENT_DESTROY_CONN:
1823                 err = iscsi_if_destroy_conn(transport, ev);
1824                 break;
1825         case ISCSI_UEVENT_BIND_CONN:
1826                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1827                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1828
1829                 if (conn && conn->ep)
1830                         iscsi_if_ep_disconnect(transport, conn->ep->id);
1831
1832                 if (!session || !conn) {
1833                         err = -EINVAL;
1834                         break;
1835                 }
1836
1837                 ev->r.retcode = transport->bind_conn(session, conn,
1838                                                 ev->u.b_conn.transport_eph,
1839                                                 ev->u.b_conn.is_leading);
1840                 if (ev->r.retcode || !transport->ep_connect)
1841                         break;
1842
1843                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1844                 if (ep) {
1845                         ep->conn = conn;
1846
1847                         mutex_lock(&conn->ep_mutex);
1848                         conn->ep = ep;
1849                         mutex_unlock(&conn->ep_mutex);
1850                 } else
1851                         iscsi_cls_conn_printk(KERN_ERR, conn,
1852                                               "Could not set ep conn "
1853                                               "binding\n");
1854                 break;
1855         case ISCSI_UEVENT_SET_PARAM:
1856                 err = iscsi_set_param(transport, ev);
1857                 break;
1858         case ISCSI_UEVENT_START_CONN:
1859                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1860                 if (conn)
1861                         ev->r.retcode = transport->start_conn(conn);
1862                 else
1863                         err = -EINVAL;
1864                 break;
1865         case ISCSI_UEVENT_STOP_CONN:
1866                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1867                 if (conn)
1868                         transport->stop_conn(conn, ev->u.stop_conn.flag);
1869                 else
1870                         err = -EINVAL;
1871                 break;
1872         case ISCSI_UEVENT_SEND_PDU:
1873                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1874                 if (conn)
1875                         ev->r.retcode = transport->send_pdu(conn,
1876                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1877                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1878                                 ev->u.send_pdu.data_size);
1879                 else
1880                         err = -EINVAL;
1881                 break;
1882         case ISCSI_UEVENT_GET_STATS:
1883                 err = iscsi_if_get_stats(transport, nlh);
1884                 break;
1885         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1886         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1887         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1888         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1889                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1890                 break;
1891         case ISCSI_UEVENT_TGT_DSCVR:
1892                 err = iscsi_tgt_dscvr(transport, ev);
1893                 break;
1894         case ISCSI_UEVENT_SET_HOST_PARAM:
1895                 err = iscsi_set_host_param(transport, ev);
1896                 break;
1897         case ISCSI_UEVENT_PATH_UPDATE:
1898                 err = iscsi_set_path(transport, ev);
1899                 break;
1900         case ISCSI_UEVENT_SET_IFACE_PARAMS:
1901                 err = iscsi_set_iface_params(transport, ev);
1902                 break;
1903         default:
1904                 err = -ENOSYS;
1905                 break;
1906         }
1907
1908         module_put(transport->owner);
1909         return err;
1910 }
1911
1912 /*
1913  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1914  * Malformed skbs with wrong lengths or invalid creds are not processed.
1915  */
1916 static void
1917 iscsi_if_rx(struct sk_buff *skb)
1918 {
1919         mutex_lock(&rx_queue_mutex);
1920         while (skb->len >= NLMSG_SPACE(0)) {
1921                 int err;
1922                 uint32_t rlen;
1923                 struct nlmsghdr *nlh;
1924                 struct iscsi_uevent *ev;
1925                 uint32_t group;
1926
1927                 nlh = nlmsg_hdr(skb);
1928                 if (nlh->nlmsg_len < sizeof(*nlh) ||
1929                     skb->len < nlh->nlmsg_len) {
1930                         break;
1931                 }
1932
1933                 ev = NLMSG_DATA(nlh);
1934                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1935                 if (rlen > skb->len)
1936                         rlen = skb->len;
1937
1938                 err = iscsi_if_recv_msg(skb, nlh, &group);
1939                 if (err) {
1940                         ev->type = ISCSI_KEVENT_IF_ERROR;
1941                         ev->iferror = err;
1942                 }
1943                 do {
1944                         /*
1945                          * special case for GET_STATS:
1946                          * on success - sending reply and stats from
1947                          * inside of if_recv_msg(),
1948                          * on error - fall through.
1949                          */
1950                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1951                                 break;
1952                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1953                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1954                 } while (err < 0 && err != -ECONNREFUSED);
1955                 skb_pull(skb, rlen);
1956         }
1957         mutex_unlock(&rx_queue_mutex);
1958 }
1959
1960 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
1961 struct device_attribute dev_attr_##_prefix##_##_name =  \
1962         __ATTR(_name,_mode,_show,_store)
1963
1964 /*
1965  * iSCSI connection attrs
1966  */
1967 #define iscsi_conn_attr_show(param)                                     \
1968 static ssize_t                                                          \
1969 show_conn_param_##param(struct device *dev,                             \
1970                         struct device_attribute *attr, char *buf)       \
1971 {                                                                       \
1972         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
1973         struct iscsi_transport *t = conn->transport;                    \
1974         return t->get_conn_param(conn, param, buf);                     \
1975 }
1976
1977 #define iscsi_conn_attr(field, param)                                   \
1978         iscsi_conn_attr_show(param)                                     \
1979 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
1980                         NULL);
1981
1982 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1983 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1984 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1985 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1986 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1987 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1988 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1989 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1990 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1991 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1992 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1993
1994 #define iscsi_conn_ep_attr_show(param)                                  \
1995 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
1996                                           struct device_attribute *attr,\
1997                                           char *buf)                    \
1998 {                                                                       \
1999         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2000         struct iscsi_transport *t = conn->transport;                    \
2001         struct iscsi_endpoint *ep;                                      \
2002         ssize_t rc;                                                     \
2003                                                                         \
2004         /*                                                              \
2005          * Need to make sure ep_disconnect does not free the LLD's      \
2006          * interconnect resources while we are trying to read them.     \
2007          */                                                             \
2008         mutex_lock(&conn->ep_mutex);                                    \
2009         ep = conn->ep;                                                  \
2010         if (!ep && t->ep_connect) {                                     \
2011                 mutex_unlock(&conn->ep_mutex);                          \
2012                 return -ENOTCONN;                                       \
2013         }                                                               \
2014                                                                         \
2015         if (ep)                                                         \
2016                 rc = t->get_ep_param(ep, param, buf);                   \
2017         else                                                            \
2018                 rc = t->get_conn_param(conn, param, buf);               \
2019         mutex_unlock(&conn->ep_mutex);                                  \
2020         return rc;                                                      \
2021 }
2022
2023 #define iscsi_conn_ep_attr(field, param)                                \
2024         iscsi_conn_ep_attr_show(param)                                  \
2025 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2026                         show_conn_ep_param_##param, NULL);
2027
2028 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2029 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2030
2031 static struct attribute *iscsi_conn_attrs[] = {
2032         &dev_attr_conn_max_recv_dlength.attr,
2033         &dev_attr_conn_max_xmit_dlength.attr,
2034         &dev_attr_conn_header_digest.attr,
2035         &dev_attr_conn_data_digest.attr,
2036         &dev_attr_conn_ifmarker.attr,
2037         &dev_attr_conn_ofmarker.attr,
2038         &dev_attr_conn_address.attr,
2039         &dev_attr_conn_port.attr,
2040         &dev_attr_conn_exp_statsn.attr,
2041         &dev_attr_conn_persistent_address.attr,
2042         &dev_attr_conn_persistent_port.attr,
2043         &dev_attr_conn_ping_tmo.attr,
2044         &dev_attr_conn_recv_tmo.attr,
2045         NULL,
2046 };
2047
2048 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2049                                          struct attribute *attr, int i)
2050 {
2051         struct device *cdev = container_of(kobj, struct device, kobj);
2052         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2053         struct iscsi_transport *t = conn->transport;
2054         int param;
2055
2056         if (attr == &dev_attr_conn_max_recv_dlength.attr)
2057                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2058         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2059                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2060         else if (attr == &dev_attr_conn_header_digest.attr)
2061                 param = ISCSI_PARAM_HDRDGST_EN;
2062         else if (attr == &dev_attr_conn_data_digest.attr)
2063                 param = ISCSI_PARAM_DATADGST_EN;
2064         else if (attr == &dev_attr_conn_ifmarker.attr)
2065                 param = ISCSI_PARAM_IFMARKER_EN;
2066         else if (attr == &dev_attr_conn_ofmarker.attr)
2067                 param = ISCSI_PARAM_OFMARKER_EN;
2068         else if (attr == &dev_attr_conn_address.attr)
2069                 param = ISCSI_PARAM_CONN_ADDRESS;
2070         else if (attr == &dev_attr_conn_port.attr)
2071                 param = ISCSI_PARAM_CONN_PORT;
2072         else if (attr == &dev_attr_conn_exp_statsn.attr)
2073                 param = ISCSI_PARAM_EXP_STATSN;
2074         else if (attr == &dev_attr_conn_persistent_address.attr)
2075                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2076         else if (attr == &dev_attr_conn_persistent_port.attr)
2077                 param = ISCSI_PARAM_PERSISTENT_PORT;
2078         else if (attr == &dev_attr_conn_ping_tmo.attr)
2079                 param = ISCSI_PARAM_PING_TMO;
2080         else if (attr == &dev_attr_conn_recv_tmo.attr)
2081                 param = ISCSI_PARAM_RECV_TMO;
2082         else {
2083                 WARN_ONCE(1, "Invalid conn attr");
2084                 return 0;
2085         }
2086
2087         return t->attr_is_visible(ISCSI_PARAM, param);
2088 }
2089
2090 static struct attribute_group iscsi_conn_group = {
2091         .attrs = iscsi_conn_attrs,
2092         .is_visible = iscsi_conn_attr_is_visible,
2093 };
2094
2095 /*
2096  * iSCSI session attrs
2097  */
2098 #define iscsi_session_attr_show(param, perm)                            \
2099 static ssize_t                                                          \
2100 show_session_param_##param(struct device *dev,                          \
2101                            struct device_attribute *attr, char *buf)    \
2102 {                                                                       \
2103         struct iscsi_cls_session *session =                             \
2104                 iscsi_dev_to_session(dev->parent);                      \
2105         struct iscsi_transport *t = session->transport;                 \
2106                                                                         \
2107         if (perm && !capable(CAP_SYS_ADMIN))                            \
2108                 return -EACCES;                                         \
2109         return t->get_session_param(session, param, buf);               \
2110 }
2111
2112 #define iscsi_session_attr(field, param, perm)                          \
2113         iscsi_session_attr_show(param, perm)                            \
2114 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2115                         NULL);
2116 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2117 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2118 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2119 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2120 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2121 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2122 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2123 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2124 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2125 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2126 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2127 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2128 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2129 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2130 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2131 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2132 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2133 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2134 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2135 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2136 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2137
2138 static ssize_t
2139 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2140                         char *buf)
2141 {
2142         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2143         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2144 }
2145 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2146                         NULL);
2147
2148 #define iscsi_priv_session_attr_show(field, format)                     \
2149 static ssize_t                                                          \
2150 show_priv_session_##field(struct device *dev,                           \
2151                           struct device_attribute *attr, char *buf)     \
2152 {                                                                       \
2153         struct iscsi_cls_session *session =                             \
2154                         iscsi_dev_to_session(dev->parent);              \
2155         if (session->field == -1)                                       \
2156                 return sprintf(buf, "off\n");                           \
2157         return sprintf(buf, format"\n", session->field);                \
2158 }
2159
2160 #define iscsi_priv_session_attr_store(field)                            \
2161 static ssize_t                                                          \
2162 store_priv_session_##field(struct device *dev,                          \
2163                            struct device_attribute *attr,               \
2164                            const char *buf, size_t count)               \
2165 {                                                                       \
2166         int val;                                                        \
2167         char *cp;                                                       \
2168         struct iscsi_cls_session *session =                             \
2169                 iscsi_dev_to_session(dev->parent);                      \
2170         if ((session->state == ISCSI_SESSION_FREE) ||                   \
2171             (session->state == ISCSI_SESSION_FAILED))                   \
2172                 return -EBUSY;                                          \
2173         if (strncmp(buf, "off", 3) == 0)                                \
2174                 session->field = -1;                                    \
2175         else {                                                          \
2176                 val = simple_strtoul(buf, &cp, 0);                      \
2177                 if (*cp != '\0' && *cp != '\n')                         \
2178                         return -EINVAL;                                 \
2179                 session->field = val;                                   \
2180         }                                                               \
2181         return count;                                                   \
2182 }
2183
2184 #define iscsi_priv_session_rw_attr(field, format)                       \
2185         iscsi_priv_session_attr_show(field, format)                     \
2186         iscsi_priv_session_attr_store(field)                            \
2187 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2188                         show_priv_session_##field,                      \
2189                         store_priv_session_##field)
2190 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2191
2192 static struct attribute *iscsi_session_attrs[] = {
2193         &dev_attr_sess_initial_r2t.attr,
2194         &dev_attr_sess_max_outstanding_r2t.attr,
2195         &dev_attr_sess_immediate_data.attr,
2196         &dev_attr_sess_first_burst_len.attr,
2197         &dev_attr_sess_max_burst_len.attr,
2198         &dev_attr_sess_data_pdu_in_order.attr,
2199         &dev_attr_sess_data_seq_in_order.attr,
2200         &dev_attr_sess_erl.attr,
2201         &dev_attr_sess_targetname.attr,
2202         &dev_attr_sess_tpgt.attr,
2203         &dev_attr_sess_password.attr,
2204         &dev_attr_sess_password_in.attr,
2205         &dev_attr_sess_username.attr,
2206         &dev_attr_sess_username_in.attr,
2207         &dev_attr_sess_fast_abort.attr,
2208         &dev_attr_sess_abort_tmo.attr,
2209         &dev_attr_sess_lu_reset_tmo.attr,
2210         &dev_attr_sess_tgt_reset_tmo.attr,
2211         &dev_attr_sess_ifacename.attr,
2212         &dev_attr_sess_initiatorname.attr,
2213         &dev_attr_sess_targetalias.attr,
2214         &dev_attr_priv_sess_recovery_tmo.attr,
2215         &dev_attr_priv_sess_state.attr,
2216         NULL,
2217 };
2218
2219 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2220                                             struct attribute *attr, int i)
2221 {
2222         struct device *cdev = container_of(kobj, struct device, kobj);
2223         struct iscsi_cls_session *session = transport_class_to_session(cdev);
2224         struct iscsi_transport *t = session->transport;
2225         int param;
2226
2227         if (attr == &dev_attr_sess_initial_r2t.attr)
2228                 param = ISCSI_PARAM_INITIAL_R2T_EN;
2229         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2230                 param = ISCSI_PARAM_MAX_R2T;
2231         else if (attr == &dev_attr_sess_immediate_data.attr)
2232                 param = ISCSI_PARAM_IMM_DATA_EN;
2233         else if (attr == &dev_attr_sess_first_burst_len.attr)
2234                 param = ISCSI_PARAM_FIRST_BURST;
2235         else if (attr == &dev_attr_sess_max_burst_len.attr)
2236                 param = ISCSI_PARAM_MAX_BURST;
2237         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2238                 param = ISCSI_PARAM_PDU_INORDER_EN;
2239         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2240                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2241         else if (attr == &dev_attr_sess_erl.attr)
2242                 param = ISCSI_PARAM_ERL;
2243         else if (attr == &dev_attr_sess_targetname.attr)
2244                 param = ISCSI_PARAM_TARGET_NAME;
2245         else if (attr == &dev_attr_sess_tpgt.attr)
2246                 param = ISCSI_PARAM_TPGT;
2247         else if (attr == &dev_attr_sess_password.attr)
2248                 param = ISCSI_PARAM_USERNAME;
2249         else if (attr == &dev_attr_sess_password_in.attr)
2250                 param = ISCSI_PARAM_USERNAME_IN;
2251         else if (attr == &dev_attr_sess_username.attr)
2252                 param = ISCSI_PARAM_PASSWORD;
2253         else if (attr == &dev_attr_sess_username_in.attr)
2254                 param = ISCSI_PARAM_PASSWORD_IN;
2255         else if (attr == &dev_attr_sess_fast_abort.attr)
2256                 param = ISCSI_PARAM_FAST_ABORT;
2257         else if (attr == &dev_attr_sess_abort_tmo.attr)
2258                 param = ISCSI_PARAM_ABORT_TMO;
2259         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2260                 param = ISCSI_PARAM_LU_RESET_TMO;
2261         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2262                 param = ISCSI_PARAM_TGT_RESET_TMO;
2263         else if (attr == &dev_attr_sess_ifacename.attr)
2264                 param = ISCSI_PARAM_IFACE_NAME;
2265         else if (attr == &dev_attr_sess_initiatorname.attr)
2266                 param = ISCSI_PARAM_INITIATOR_NAME;
2267         else if (attr == &dev_attr_sess_targetalias.attr)
2268                 param = ISCSI_PARAM_TARGET_ALIAS;
2269         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2270                 return S_IRUGO | S_IWUSR;
2271         else if (attr == &dev_attr_priv_sess_state.attr)
2272                 return S_IRUGO;
2273         else {
2274                 WARN_ONCE(1, "Invalid session attr");
2275                 return 0;
2276         }
2277
2278         return t->attr_is_visible(ISCSI_PARAM, param);
2279 }
2280
2281 static struct attribute_group iscsi_session_group = {
2282         .attrs = iscsi_session_attrs,
2283         .is_visible = iscsi_session_attr_is_visible,
2284 };
2285
2286 /*
2287  * iSCSI host attrs
2288  */
2289 #define iscsi_host_attr_show(param)                                     \
2290 static ssize_t                                                          \
2291 show_host_param_##param(struct device *dev,                             \
2292                         struct device_attribute *attr, char *buf)       \
2293 {                                                                       \
2294         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2295         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2296         return priv->iscsi_transport->get_host_param(shost, param, buf); \
2297 }
2298
2299 #define iscsi_host_attr(field, param)                                   \
2300         iscsi_host_attr_show(param)                                     \
2301 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2302                         NULL);
2303
2304 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2305 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2306 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2307 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2308
2309 static struct attribute *iscsi_host_attrs[] = {
2310         &dev_attr_host_netdev.attr,
2311         &dev_attr_host_hwaddress.attr,
2312         &dev_attr_host_ipaddress.attr,
2313         &dev_attr_host_initiatorname.attr,
2314         NULL,
2315 };
2316
2317 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2318                                          struct attribute *attr, int i)
2319 {
2320         struct device *cdev = container_of(kobj, struct device, kobj);
2321         struct Scsi_Host *shost = transport_class_to_shost(cdev);
2322         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2323         int param;
2324
2325         if (attr == &dev_attr_host_netdev.attr)
2326                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2327         else if (attr == &dev_attr_host_hwaddress.attr)
2328                 param = ISCSI_HOST_PARAM_HWADDRESS;
2329         else if (attr == &dev_attr_host_ipaddress.attr)
2330                 param = ISCSI_HOST_PARAM_IPADDRESS;
2331         else if (attr == &dev_attr_host_initiatorname.attr)
2332                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2333         else {
2334                 WARN_ONCE(1, "Invalid host attr");
2335                 return 0;
2336         }
2337
2338         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2339 }
2340
2341 static struct attribute_group iscsi_host_group = {
2342         .attrs = iscsi_host_attrs,
2343         .is_visible = iscsi_host_attr_is_visible,
2344 };
2345
2346 static int iscsi_session_match(struct attribute_container *cont,
2347                            struct device *dev)
2348 {
2349         struct iscsi_cls_session *session;
2350         struct Scsi_Host *shost;
2351         struct iscsi_internal *priv;
2352
2353         if (!iscsi_is_session_dev(dev))
2354                 return 0;
2355
2356         session = iscsi_dev_to_session(dev);
2357         shost = iscsi_session_to_shost(session);
2358         if (!shost->transportt)
2359                 return 0;
2360
2361         priv = to_iscsi_internal(shost->transportt);
2362         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2363                 return 0;
2364
2365         return &priv->session_cont.ac == cont;
2366 }
2367
2368 static int iscsi_conn_match(struct attribute_container *cont,
2369                            struct device *dev)
2370 {
2371         struct iscsi_cls_session *session;
2372         struct iscsi_cls_conn *conn;
2373         struct Scsi_Host *shost;
2374         struct iscsi_internal *priv;
2375
2376         if (!iscsi_is_conn_dev(dev))
2377                 return 0;
2378
2379         conn = iscsi_dev_to_conn(dev);
2380         session = iscsi_dev_to_session(conn->dev.parent);
2381         shost = iscsi_session_to_shost(session);
2382
2383         if (!shost->transportt)
2384                 return 0;
2385
2386         priv = to_iscsi_internal(shost->transportt);
2387         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2388                 return 0;
2389
2390         return &priv->conn_cont.ac == cont;
2391 }
2392
2393 static int iscsi_host_match(struct attribute_container *cont,
2394                             struct device *dev)
2395 {
2396         struct Scsi_Host *shost;
2397         struct iscsi_internal *priv;
2398
2399         if (!scsi_is_host_device(dev))
2400                 return 0;
2401
2402         shost = dev_to_shost(dev);
2403         if (!shost->transportt  ||
2404             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2405                 return 0;
2406
2407         priv = to_iscsi_internal(shost->transportt);
2408         return &priv->t.host_attrs.ac == cont;
2409 }
2410
2411 struct scsi_transport_template *
2412 iscsi_register_transport(struct iscsi_transport *tt)
2413 {
2414         struct iscsi_internal *priv;
2415         unsigned long flags;
2416         int err;
2417
2418         BUG_ON(!tt);
2419
2420         priv = iscsi_if_transport_lookup(tt);
2421         if (priv)
2422                 return NULL;
2423
2424         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2425         if (!priv)
2426                 return NULL;
2427         INIT_LIST_HEAD(&priv->list);
2428         priv->iscsi_transport = tt;
2429         priv->t.user_scan = iscsi_user_scan;
2430         priv->t.create_work_queue = 1;
2431
2432         priv->dev.class = &iscsi_transport_class;
2433         dev_set_name(&priv->dev, "%s", tt->name);
2434         err = device_register(&priv->dev);
2435         if (err)
2436                 goto free_priv;
2437
2438         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2439         if (err)
2440                 goto unregister_dev;
2441
2442         /* host parameters */
2443         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2444         priv->t.host_attrs.ac.match = iscsi_host_match;
2445         priv->t.host_attrs.ac.grp = &iscsi_host_group;
2446         priv->t.host_size = sizeof(struct iscsi_cls_host);
2447         transport_container_register(&priv->t.host_attrs);
2448
2449         /* connection parameters */
2450         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2451         priv->conn_cont.ac.match = iscsi_conn_match;
2452         priv->conn_cont.ac.grp = &iscsi_conn_group;
2453         transport_container_register(&priv->conn_cont);
2454
2455         /* session parameters */
2456         priv->session_cont.ac.class = &iscsi_session_class.class;
2457         priv->session_cont.ac.match = iscsi_session_match;
2458         priv->session_cont.ac.grp = &iscsi_session_group;
2459         transport_container_register(&priv->session_cont);
2460
2461         spin_lock_irqsave(&iscsi_transport_lock, flags);
2462         list_add(&priv->list, &iscsi_transports);
2463         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2464
2465         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2466         return &priv->t;
2467
2468 unregister_dev:
2469         device_unregister(&priv->dev);
2470         return NULL;
2471 free_priv:
2472         kfree(priv);
2473         return NULL;
2474 }
2475 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2476
2477 int iscsi_unregister_transport(struct iscsi_transport *tt)
2478 {
2479         struct iscsi_internal *priv;
2480         unsigned long flags;
2481
2482         BUG_ON(!tt);
2483
2484         mutex_lock(&rx_queue_mutex);
2485
2486         priv = iscsi_if_transport_lookup(tt);
2487         BUG_ON (!priv);
2488
2489         spin_lock_irqsave(&iscsi_transport_lock, flags);
2490         list_del(&priv->list);
2491         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2492
2493         transport_container_unregister(&priv->conn_cont);
2494         transport_container_unregister(&priv->session_cont);
2495         transport_container_unregister(&priv->t.host_attrs);
2496
2497         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2498         device_unregister(&priv->dev);
2499         mutex_unlock(&rx_queue_mutex);
2500
2501         return 0;
2502 }
2503 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2504
2505 static __init int iscsi_transport_init(void)
2506 {
2507         int err;
2508
2509         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2510                 ISCSI_TRANSPORT_VERSION);
2511
2512         atomic_set(&iscsi_session_nr, 0);
2513
2514         err = class_register(&iscsi_transport_class);
2515         if (err)
2516                 return err;
2517
2518         err = class_register(&iscsi_endpoint_class);
2519         if (err)
2520                 goto unregister_transport_class;
2521
2522         err = class_register(&iscsi_iface_class);
2523         if (err)
2524                 goto unregister_endpoint_class;
2525
2526         err = transport_class_register(&iscsi_host_class);
2527         if (err)
2528                 goto unregister_iface_class;
2529
2530         err = transport_class_register(&iscsi_connection_class);
2531         if (err)
2532                 goto unregister_host_class;
2533
2534         err = transport_class_register(&iscsi_session_class);
2535         if (err)
2536                 goto unregister_conn_class;
2537
2538         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2539                                     NULL, THIS_MODULE);
2540         if (!nls) {
2541                 err = -ENOBUFS;
2542                 goto unregister_session_class;
2543         }
2544
2545         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2546         if (!iscsi_eh_timer_workq)
2547                 goto release_nls;
2548
2549         return 0;
2550
2551 release_nls:
2552         netlink_kernel_release(nls);
2553 unregister_session_class:
2554         transport_class_unregister(&iscsi_session_class);
2555 unregister_conn_class:
2556         transport_class_unregister(&iscsi_connection_class);
2557 unregister_host_class:
2558         transport_class_unregister(&iscsi_host_class);
2559 unregister_iface_class:
2560         class_unregister(&iscsi_iface_class);
2561 unregister_endpoint_class:
2562         class_unregister(&iscsi_endpoint_class);
2563 unregister_transport_class:
2564         class_unregister(&iscsi_transport_class);
2565         return err;
2566 }
2567
2568 static void __exit iscsi_transport_exit(void)
2569 {
2570         destroy_workqueue(iscsi_eh_timer_workq);
2571         netlink_kernel_release(nls);
2572         transport_class_unregister(&iscsi_connection_class);
2573         transport_class_unregister(&iscsi_session_class);
2574         transport_class_unregister(&iscsi_host_class);
2575         class_unregister(&iscsi_endpoint_class);
2576         class_unregister(&iscsi_iface_class);
2577         class_unregister(&iscsi_transport_class);
2578 }
2579
2580 module_init(iscsi_transport_init);
2581 module_exit(iscsi_transport_exit);
2582
2583 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2584               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2585               "Alex Aizman <itn780@yahoo.com>");
2586 MODULE_DESCRIPTION("iSCSI Transport Interface");
2587 MODULE_LICENSE("GPL");
2588 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2589 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);