drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/bsg-lib.h>
  27 #include <linux/idr.h>
  28 #include <linux/list.h>
  29 #include <net/tcp.h>
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_iscsi.h>
  35 #include <scsi/iscsi_if.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <scsi/scsi_bsg_iscsi.h>
  38
  39 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63         } while (0);
  64
  65 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  66         do {                                                            \
  67                 if (dbg_conn)                                           \
  68                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  69                                               "%s: " dbg_fmt,           \
  70                                               __func__, ##arg); \
  71         } while (0);
  72
  73 struct iscsi_internal {
  74         struct scsi_transport_template t;
  75         struct iscsi_transport *iscsi_transport;
  76         struct list_head list;
  77         struct device dev;
  78
  79         struct transport_container conn_cont;
  80         struct transport_container session_cont;
  81 };
  82
  83 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  84 static struct workqueue_struct *iscsi_eh_timer_workq;
  85
  86 static DEFINE_IDA(iscsi_sess_ida);
  87 /*
  88  * list of registered transports and lock that must
  89  * be held while accessing list. The iscsi_transport_lock must
  90  * be acquired after the rx_queue_mutex.
  91  */
  92 static LIST_HEAD(iscsi_transports);
  93 static DEFINE_SPINLOCK(iscsi_transport_lock);
  94
  95 #define to_iscsi_internal(tmpl) \
  96         container_of(tmpl, struct iscsi_internal, t)
  97
  98 #define dev_to_iscsi_internal(_dev) \
  99         container_of(_dev, struct iscsi_internal, dev)
 100
 101 static void iscsi_transport_release(struct device *dev)
 102 {
 103         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 104         kfree(priv);
 105 }
 106
 107 /*
 108  * iscsi_transport_class represents the iscsi_transports that are
 109  * registered.
 110  */
 111 static struct class iscsi_transport_class = {
 112         .name = "iscsi_transport",
 113         .dev_release = iscsi_transport_release,
 114 };
 115
 116 static ssize_t
 117 show_transport_handle(struct device *dev, struct device_attribute *attr,
 118                       char *buf)
 119 {
 120         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 121         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 122 }
 123 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 124
 125 #define show_transport_attr(name, format)                               \
 126 static ssize_t                                                          \
 127 show_transport_##name(struct device *dev,                               \
 128                       struct device_attribute *attr,char *buf)          \
 129 {                                                                       \
 130         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 131         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 132 }                                                                       \
 133 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 134
 135 show_transport_attr(caps, "0x%x");
 136
 137 static struct attribute *iscsi_transport_attrs[] = {
 138         &dev_attr_handle.attr,
 139         &dev_attr_caps.attr,
 140         NULL,
 141 };
 142
 143 static struct attribute_group iscsi_transport_group = {
 144         .attrs = iscsi_transport_attrs,
 145 };
 146
 147 /*
 148  * iSCSI endpoint attrs
 149  */
 150 #define iscsi_dev_to_endpoint(_dev) \
 151         container_of(_dev, struct iscsi_endpoint, dev)
 152
 153 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 154 struct device_attribute dev_attr_##_prefix##_##_name =  \
 155         __ATTR(_name,_mode,_show,_store)
 156
 157 static void iscsi_endpoint_release(struct device *dev)
 158 {
 159         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 160         kfree(ep);
 161 }
 162
 163 static struct class iscsi_endpoint_class = {
 164         .name = "iscsi_endpoint",
 165         .dev_release = iscsi_endpoint_release,
 166 };
 167
 168 static ssize_t
 169 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 170 {
 171         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 172         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 173 }
 174 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 175
 176 static struct attribute *iscsi_endpoint_attrs[] = {
 177         &dev_attr_ep_handle.attr,
 178         NULL,
 179 };
 180
 181 static struct attribute_group iscsi_endpoint_group = {
 182         .attrs = iscsi_endpoint_attrs,
 183 };
 184
 185 #define ISCSI_MAX_EPID -1
 186
 187 static int iscsi_match_epid(struct device *dev, const void *data)
 188 {
 189         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 190         const uint64_t *epid = data;
 191
 192         return *epid == ep->id;
 193 }
 194
 195 struct iscsi_endpoint *
 196 iscsi_create_endpoint(int dd_size)
 197 {
 198         struct device *dev;
 199         struct iscsi_endpoint *ep;
 200         uint64_t id;
 201         int err;
 202
 203         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 204                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 205                                         iscsi_match_epid);
 206                 if (!dev)
 207                         break;
 208         }
 209         if (id == ISCSI_MAX_EPID) {
 210                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 211                        ISCSI_MAX_EPID - 1);
 212                 return NULL;
 213         }
 214
 215         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 216         if (!ep)
 217                 return NULL;
 218
 219         ep->id = id;
 220         ep->dev.class = &iscsi_endpoint_class;
 221         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 222         err = device_register(&ep->dev);
 223         if (err)
 224                 goto free_ep;
 225
 226         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 227         if (err)
 228                 goto unregister_dev;
 229
 230         if (dd_size)
 231                 ep->dd_data = &ep[1];
 232         return ep;
 233
 234 unregister_dev:
 235         device_unregister(&ep->dev);
 236         return NULL;
 237
 238 free_ep:
 239         kfree(ep);
 240         return NULL;
 241 }
 242 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 243
 244 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 245 {
 246         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 247         device_unregister(&ep->dev);
 248 }
 249 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 250
 251 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 252 {
 253         struct iscsi_endpoint *ep;
 254         struct device *dev;
 255
 256         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 257                                 iscsi_match_epid);
 258         if (!dev)
 259                 return NULL;
 260
 261         ep = iscsi_dev_to_endpoint(dev);
 262         /*
 263          * we can drop this now because the interface will prevent
 264          * removals and lookups from racing.
 265          */
 266         put_device(dev);
 267         return ep;
 268 }
 269 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 270
 271 /*
 272  * Interface to display network param to sysfs
 273  */
 274
 275 static void iscsi_iface_release(struct device *dev)
 276 {
 277         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 278         struct device *parent = iface->dev.parent;
 279
 280         kfree(iface);
 281         put_device(parent);
 282 }
 283
 284
 285 static struct class iscsi_iface_class = {
 286         .name = "iscsi_iface",
 287         .dev_release = iscsi_iface_release,
 288 };
 289
 290 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 291 struct device_attribute dev_attr_##_prefix##_##_name =          \
 292         __ATTR(_name, _mode, _show, _store)
 293
 294 /* iface attrs show */
 295 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 296 static ssize_t                                                          \
 297 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 298                      char *buf)                                         \
 299 {                                                                       \
 300         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 301         struct iscsi_transport *t = iface->transport;                   \
 302         return t->get_iface_param(iface, param_type, param, buf);       \
 303 }                                                                       \
 304
 305 #define iscsi_iface_net_attr(type, name, param)                         \
 306         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 307 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 308
 309 /* generic read only ipvi4 attribute */
 310 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 311 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 312 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 313 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 314
 315 /* generic read only ipv6 attribute */
 316 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 317 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 318 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 319 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 320                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 321 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 322                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 323
 324 /* common read only iface attribute */
 325 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 326 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 327 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 328 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 329 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 330 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 331
 332 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 333                                           struct attribute *attr, int i)
 334 {
 335         struct device *dev = container_of(kobj, struct device, kobj);
 336         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 337         struct iscsi_transport *t = iface->transport;
 338         int param;
 339
 340         if (attr == &dev_attr_iface_enabled.attr)
 341                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 342         else if (attr == &dev_attr_iface_vlan_id.attr)
 343                 param = ISCSI_NET_PARAM_VLAN_ID;
 344         else if (attr == &dev_attr_iface_vlan_priority.attr)
 345                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 346         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 347                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 348         else if (attr == &dev_attr_iface_mtu.attr)
 349                 param = ISCSI_NET_PARAM_MTU;
 350         else if (attr == &dev_attr_iface_port.attr)
 351                 param = ISCSI_NET_PARAM_PORT;
 352         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 353                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 354                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 355                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 356                         param = ISCSI_NET_PARAM_IPV4_GW;
 357                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 358                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 359                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 360                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 361                 else
 362                         return 0;
 363         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 364                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 365                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 366                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 367                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 368                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 369                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 370                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 371                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 372                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 373                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 374                 else
 375                         return 0;
 376         } else {
 377                 WARN_ONCE(1, "Invalid iface attr");
 378                 return 0;
 379         }
 380
 381         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 382 }
 383
 384 static struct attribute *iscsi_iface_attrs[] = {
 385         &dev_attr_iface_enabled.attr,
 386         &dev_attr_iface_vlan_id.attr,
 387         &dev_attr_iface_vlan_priority.attr,
 388         &dev_attr_iface_vlan_enabled.attr,
 389         &dev_attr_ipv4_iface_ipaddress.attr,
 390         &dev_attr_ipv4_iface_gateway.attr,
 391         &dev_attr_ipv4_iface_subnet.attr,
 392         &dev_attr_ipv4_iface_bootproto.attr,
 393         &dev_attr_ipv6_iface_ipaddress.attr,
 394         &dev_attr_ipv6_iface_link_local_addr.attr,
 395         &dev_attr_ipv6_iface_router_addr.attr,
 396         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 397         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 398         &dev_attr_iface_mtu.attr,
 399         &dev_attr_iface_port.attr,
 400         NULL,
 401 };
 402
 403 static struct attribute_group iscsi_iface_group = {
 404         .attrs = iscsi_iface_attrs,
 405         .is_visible = iscsi_iface_attr_is_visible,
 406 };
 407
 408 struct iscsi_iface *
 409 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 410                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 411 {
 412         struct iscsi_iface *iface;
 413         int err;
 414
 415         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 416         if (!iface)
 417                 return NULL;
 418
 419         iface->transport = transport;
 420         iface->iface_type = iface_type;
 421         iface->iface_num = iface_num;
 422         iface->dev.release = iscsi_iface_release;
 423         iface->dev.class = &iscsi_iface_class;
 424         /* parent reference released in iscsi_iface_release */
 425         iface->dev.parent = get_device(&shost->shost_gendev);
 426         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 427                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 428                              iface_num);
 429         else
 430                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 431                              iface_num);
 432
 433         err = device_register(&iface->dev);
 434         if (err)
 435                 goto free_iface;
 436
 437         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 438         if (err)
 439                 goto unreg_iface;
 440
 441         if (dd_size)
 442                 iface->dd_data = &iface[1];
 443         return iface;
 444
 445 unreg_iface:
 446         device_unregister(&iface->dev);
 447         return NULL;
 448
 449 free_iface:
 450         put_device(iface->dev.parent);
 451         kfree(iface);
 452         return NULL;
 453 }
 454 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 455
 456 void iscsi_destroy_iface(struct iscsi_iface *iface)
 457 {
 458         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 459         device_unregister(&iface->dev);
 460 }
 461 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 462
 463 /*
 464  * Interface to display flash node params to sysfs
 465  */
 466
 467 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 468 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 469         __ATTR(_name, _mode, _show, _store)
 470
 471 /* flash node session attrs show */
 472 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 473 static ssize_t                                                          \
 474 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 475                      char *buf)                                         \
 476 {                                                                       \
 477         struct iscsi_bus_flash_session *fnode_sess =                    \
 478                                         iscsi_dev_to_flash_session(dev);\
 479         struct iscsi_transport *t = fnode_sess->transport;              \
 480         return t->get_flashnode_param(fnode_sess, param, buf);          \
 481 }                                                                       \
 482
 483
 484 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 485         iscsi_flashnode_sess_attr_show(type, name, param)               \
 486 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 487                             show_##type##_##name, NULL);
 488
 489 /* Flash node session attributes */
 490
 491 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 492                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 493 iscsi_flashnode_sess_attr(fnode, discovery_session,
 494                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 495 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 496 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 497 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 498 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 499 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 500                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 501 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 502                           ISCSI_FLASHNODE_PDU_INORDER);
 503 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 504 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 505                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 506 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 507 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 508                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 509 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 510 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 511 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 512 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 513                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 514 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 515 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 516 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 517 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 518 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 519                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 520 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 521 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 522 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 523 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 524                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 525 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 526                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 527 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 528 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 529 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 530 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 531 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 532 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 533 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 534
 535 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 536         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 537         &dev_attr_fnode_discovery_session.attr,
 538         &dev_attr_fnode_portal_type.attr,
 539         &dev_attr_fnode_entry_enable.attr,
 540         &dev_attr_fnode_immediate_data.attr,
 541         &dev_attr_fnode_initial_r2t.attr,
 542         &dev_attr_fnode_data_seq_in_order.attr,
 543         &dev_attr_fnode_data_pdu_in_order.attr,
 544         &dev_attr_fnode_chap_auth.attr,
 545         &dev_attr_fnode_discovery_logout.attr,
 546         &dev_attr_fnode_bidi_chap.attr,
 547         &dev_attr_fnode_discovery_auth_optional.attr,
 548         &dev_attr_fnode_erl.attr,
 549         &dev_attr_fnode_first_burst_len.attr,
 550         &dev_attr_fnode_def_time2wait.attr,
 551         &dev_attr_fnode_def_time2retain.attr,
 552         &dev_attr_fnode_max_outstanding_r2t.attr,
 553         &dev_attr_fnode_isid.attr,
 554         &dev_attr_fnode_tsid.attr,
 555         &dev_attr_fnode_max_burst_len.attr,
 556         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 557         &dev_attr_fnode_targetalias.attr,
 558         &dev_attr_fnode_targetname.attr,
 559         &dev_attr_fnode_tpgt.attr,
 560         &dev_attr_fnode_discovery_parent_idx.attr,
 561         &dev_attr_fnode_discovery_parent_type.attr,
 562         &dev_attr_fnode_chap_in_idx.attr,
 563         &dev_attr_fnode_chap_out_idx.attr,
 564         &dev_attr_fnode_username.attr,
 565         &dev_attr_fnode_username_in.attr,
 566         &dev_attr_fnode_password.attr,
 567         &dev_attr_fnode_password_in.attr,
 568         &dev_attr_fnode_is_boot_target.attr,
 569         NULL,
 570 };
 571
 572 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 573                                                     struct attribute *attr,
 574                                                     int i)
 575 {
 576         struct device *dev = container_of(kobj, struct device, kobj);
 577         struct iscsi_bus_flash_session *fnode_sess =
 578                                                 iscsi_dev_to_flash_session(dev);
 579         struct iscsi_transport *t = fnode_sess->transport;
 580         int param;
 581
 582         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 583                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 584         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 585                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 586         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 587                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 588         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 589                 param = ISCSI_FLASHNODE_ENTRY_EN;
 590         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 591                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 592         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 593                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 594         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 595                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 596         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 597                 param = ISCSI_FLASHNODE_PDU_INORDER;
 598         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 599                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 600         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 601                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 602         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 603                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 604         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 605                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 606         } else if (attr == &dev_attr_fnode_erl.attr) {
 607                 param = ISCSI_FLASHNODE_ERL;
 608         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 609                 param = ISCSI_FLASHNODE_FIRST_BURST;
 610         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 611                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 612         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 613                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 614         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 615                 param = ISCSI_FLASHNODE_MAX_R2T;
 616         } else if (attr == &dev_attr_fnode_isid.attr) {
 617                 param = ISCSI_FLASHNODE_ISID;
 618         } else if (attr == &dev_attr_fnode_tsid.attr) {
 619                 param = ISCSI_FLASHNODE_TSID;
 620         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 621                 param = ISCSI_FLASHNODE_MAX_BURST;
 622         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 623                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 624         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 625                 param = ISCSI_FLASHNODE_ALIAS;
 626         } else if (attr == &dev_attr_fnode_targetname.attr) {
 627                 param = ISCSI_FLASHNODE_NAME;
 628         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 629                 param = ISCSI_FLASHNODE_TPGT;
 630         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 631                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 632         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 633                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 634         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 635                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 636         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 637                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 638         } else if (attr == &dev_attr_fnode_username.attr) {
 639                 param = ISCSI_FLASHNODE_USERNAME;
 640         } else if (attr == &dev_attr_fnode_username_in.attr) {
 641                 param = ISCSI_FLASHNODE_USERNAME_IN;
 642         } else if (attr == &dev_attr_fnode_password.attr) {
 643                 param = ISCSI_FLASHNODE_PASSWORD;
 644         } else if (attr == &dev_attr_fnode_password_in.attr) {
 645                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 646         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 647                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 648         } else {
 649                 WARN_ONCE(1, "Invalid flashnode session attr");
 650                 return 0;
 651         }
 652
 653         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 654 }
 655
 656 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 657         .attrs = iscsi_flashnode_sess_attrs,
 658         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 659 };
 660
 661 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 662         &iscsi_flashnode_sess_attr_group,
 663         NULL,
 664 };
 665
 666 static void iscsi_flashnode_sess_release(struct device *dev)
 667 {
 668         struct iscsi_bus_flash_session *fnode_sess =
 669                                                 iscsi_dev_to_flash_session(dev);
 670
 671         kfree(fnode_sess->targetname);
 672         kfree(fnode_sess->targetalias);
 673         kfree(fnode_sess->portal_type);
 674         kfree(fnode_sess);
 675 }
 676
 677 struct device_type iscsi_flashnode_sess_dev_type = {
 678         .name = "iscsi_flashnode_sess_dev_type",
 679         .groups = iscsi_flashnode_sess_attr_groups,
 680         .release = iscsi_flashnode_sess_release,
 681 };
 682
 683 /* flash node connection attrs show */
 684 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
 685 static ssize_t                                                          \
 686 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 687                      char *buf)                                         \
 688 {                                                                       \
 689         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
 690         struct iscsi_bus_flash_session *fnode_sess =                    \
 691                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
 692         struct iscsi_transport *t = fnode_conn->transport;              \
 693         return t->get_flashnode_param(fnode_sess, param, buf);          \
 694 }                                                                       \
 695
 696
 697 #define iscsi_flashnode_conn_attr(type, name, param)                    \
 698         iscsi_flashnode_conn_attr_show(type, name, param)               \
 699 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 700                             show_##type##_##name, NULL);
 701
 702 /* Flash node connection attributes */
 703
 704 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
 705                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
 706 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
 707 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
 708 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
 709 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
 710                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
 711 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
 712                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
 713 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
 714                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
 715 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
 716                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
 717 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
 718                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
 719 iscsi_flashnode_conn_attr(fnode, fragment_disable,
 720                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
 721 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
 722 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
 723 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
 724 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
 725                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
 726 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
 727                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
 728 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
 729 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
 730 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
 731 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
 732                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
 733 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
 734                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
 735 iscsi_flashnode_conn_attr(fnode, max_segment_size,
 736                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
 737 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
 738                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
 739 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
 740 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
 741 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
 742 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
 743
 744 static struct attribute *iscsi_flashnode_conn_attrs[] = {
 745         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
 746         &dev_attr_fnode_header_digest.attr,
 747         &dev_attr_fnode_data_digest.attr,
 748         &dev_attr_fnode_snack_req.attr,
 749         &dev_attr_fnode_tcp_timestamp_stat.attr,
 750         &dev_attr_fnode_tcp_nagle_disable.attr,
 751         &dev_attr_fnode_tcp_wsf_disable.attr,
 752         &dev_attr_fnode_tcp_timer_scale.attr,
 753         &dev_attr_fnode_tcp_timestamp_enable.attr,
 754         &dev_attr_fnode_fragment_disable.attr,
 755         &dev_attr_fnode_max_recv_dlength.attr,
 756         &dev_attr_fnode_max_xmit_dlength.attr,
 757         &dev_attr_fnode_keepalive_tmo.attr,
 758         &dev_attr_fnode_port.attr,
 759         &dev_attr_fnode_ipaddress.attr,
 760         &dev_attr_fnode_redirect_ipaddr.attr,
 761         &dev_attr_fnode_max_segment_size.attr,
 762         &dev_attr_fnode_local_port.attr,
 763         &dev_attr_fnode_ipv4_tos.attr,
 764         &dev_attr_fnode_ipv6_traffic_class.attr,
 765         &dev_attr_fnode_ipv6_flow_label.attr,
 766         &dev_attr_fnode_link_local_ipv6.attr,
 767         &dev_attr_fnode_tcp_xmit_wsf.attr,
 768         &dev_attr_fnode_tcp_recv_wsf.attr,
 769         &dev_attr_fnode_statsn.attr,
 770         &dev_attr_fnode_exp_statsn.attr,
 771         NULL,
 772 };
 773
 774 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
 775                                                     struct attribute *attr,
 776                                                     int i)
 777 {
 778         struct device *dev = container_of(kobj, struct device, kobj);
 779         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
 780         struct iscsi_transport *t = fnode_conn->transport;
 781         int param;
 782
 783         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
 784                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
 785         } else if (attr == &dev_attr_fnode_header_digest.attr) {
 786                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
 787         } else if (attr == &dev_attr_fnode_data_digest.attr) {
 788                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
 789         } else if (attr == &dev_attr_fnode_snack_req.attr) {
 790                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
 791         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
 792                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
 793         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
 794                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
 795         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
 796                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
 797         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
 798                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
 799         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
 800                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
 801         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
 802                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
 803         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
 804                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
 805         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
 806                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
 807         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
 808                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
 809         } else if (attr == &dev_attr_fnode_port.attr) {
 810                 param = ISCSI_FLASHNODE_PORT;
 811         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
 812                 param = ISCSI_FLASHNODE_IPADDR;
 813         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
 814                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
 815         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
 816                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
 817         } else if (attr == &dev_attr_fnode_local_port.attr) {
 818                 param = ISCSI_FLASHNODE_LOCAL_PORT;
 819         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
 820                 param = ISCSI_FLASHNODE_IPV4_TOS;
 821         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
 822                 param = ISCSI_FLASHNODE_IPV6_TC;
 823         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
 824                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
 825         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
 826                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
 827         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
 828                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
 829         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
 830                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
 831         } else if (attr == &dev_attr_fnode_statsn.attr) {
 832                 param = ISCSI_FLASHNODE_STATSN;
 833         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
 834                 param = ISCSI_FLASHNODE_EXP_STATSN;
 835         } else {
 836                 WARN_ONCE(1, "Invalid flashnode connection attr");
 837                 return 0;
 838         }
 839
 840         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 841 }
 842
 843 static struct attribute_group iscsi_flashnode_conn_attr_group = {
 844         .attrs = iscsi_flashnode_conn_attrs,
 845         .is_visible = iscsi_flashnode_conn_attr_is_visible,
 846 };
 847
 848 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
 849         &iscsi_flashnode_conn_attr_group,
 850         NULL,
 851 };
 852
 853 static void iscsi_flashnode_conn_release(struct device *dev)
 854 {
 855         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
 856
 857         kfree(fnode_conn->ipaddress);
 858         kfree(fnode_conn->redirect_ipaddr);
 859         kfree(fnode_conn->link_local_ipv6_addr);
 860         kfree(fnode_conn);
 861 }
 862
 863 struct device_type iscsi_flashnode_conn_dev_type = {
 864         .name = "iscsi_flashnode_conn_dev_type",
 865         .groups = iscsi_flashnode_conn_attr_groups,
 866         .release = iscsi_flashnode_conn_release,
 867 };
 868
 869 struct bus_type iscsi_flashnode_bus;
 870
 871 int iscsi_flashnode_bus_match(struct device *dev,
 872                                      struct device_driver *drv)
 873 {
 874         if (dev->bus == &iscsi_flashnode_bus)
 875                 return 1;
 876         return 0;
 877 }
 878 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
 879
 880 struct bus_type iscsi_flashnode_bus = {
 881         .name = "iscsi_flashnode",
 882         .match = &iscsi_flashnode_bus_match,
 883 };
 884
 885 /**
 886  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
 887  * @shost: pointer to host data
 888  * @index: index of flashnode to add in sysfs
 889  * @transport: pointer to transport data
 890  * @dd_size: total size to allocate
 891  *
 892  * Adds a sysfs entry for the flashnode session attributes
 893  *
 894  * Returns:
 895  *  pointer to allocated flashnode sess on sucess
 896  *  %NULL on failure
 897  */
 898 struct iscsi_bus_flash_session *
 899 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
 900                             struct iscsi_transport *transport,
 901                             int dd_size)
 902 {
 903         struct iscsi_bus_flash_session *fnode_sess;
 904         int err;
 905
 906         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
 907         if (!fnode_sess)
 908                 return NULL;
 909
 910         fnode_sess->transport = transport;
 911         fnode_sess->target_id = index;
 912         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
 913         fnode_sess->dev.bus = &iscsi_flashnode_bus;
 914         fnode_sess->dev.parent = &shost->shost_gendev;
 915         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
 916                      shost->host_no, index);
 917
 918         err = device_register(&fnode_sess->dev);
 919         if (err)
 920                 goto free_fnode_sess;
 921
 922         if (dd_size)
 923                 fnode_sess->dd_data = &fnode_sess[1];
 924
 925         return fnode_sess;
 926
 927 free_fnode_sess:
 928         kfree(fnode_sess);
 929         return NULL;
 930 }
 931 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
 932
 933 /**
 934  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
 935  * @shost: pointer to host data
 936  * @fnode_sess: pointer to the parent flashnode session entry
 937  * @transport: pointer to transport data
 938  * @dd_size: total size to allocate
 939  *
 940  * Adds a sysfs entry for the flashnode connection attributes
 941  *
 942  * Returns:
 943  *  pointer to allocated flashnode conn on success
 944  *  %NULL on failure
 945  */
 946 struct iscsi_bus_flash_conn *
 947 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
 948                             struct iscsi_bus_flash_session *fnode_sess,
 949                             struct iscsi_transport *transport,
 950                             int dd_size)
 951 {
 952         struct iscsi_bus_flash_conn *fnode_conn;
 953         int err;
 954
 955         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
 956         if (!fnode_conn)
 957                 return NULL;
 958
 959         fnode_conn->transport = transport;
 960         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
 961         fnode_conn->dev.bus = &iscsi_flashnode_bus;
 962         fnode_conn->dev.parent = &fnode_sess->dev;
 963         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
 964                      shost->host_no, fnode_sess->target_id);
 965
 966         err = device_register(&fnode_conn->dev);
 967         if (err)
 968                 goto free_fnode_conn;
 969
 970         if (dd_size)
 971                 fnode_conn->dd_data = &fnode_conn[1];
 972
 973         return fnode_conn;
 974
 975 free_fnode_conn:
 976         kfree(fnode_conn);
 977         return NULL;
 978 }
 979 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
 980
 981 /**
 982  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
 983  * @dev: device to verify
 984  * @data: pointer to data containing value to use for verification
 985  *
 986  * Verifies if the passed device is flashnode conn device
 987  *
 988  * Returns:
 989  *  1 on success
 990  *  0 on failure
 991  */
 992 int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
 993 {
 994         return dev->bus == &iscsi_flashnode_bus;
 995 }
 996 EXPORT_SYMBOL_GPL(iscsi_is_flashnode_conn_dev);
 997
 998 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
 999 {
1000         device_unregister(&fnode_conn->dev);
1001         return 0;
1002 }
1003
1004 static int flashnode_match_index(struct device *dev, void *data)
1005 {
1006         struct iscsi_bus_flash_session *fnode_sess = NULL;
1007         int ret = 0;
1008
1009         if (!iscsi_flashnode_bus_match(dev, NULL))
1010                 goto exit_match_index;
1011
1012         fnode_sess = iscsi_dev_to_flash_session(dev);
1013         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1014
1015 exit_match_index:
1016         return ret;
1017 }
1018
1019 /**
1020  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1021  * @shost: pointer to host data
1022  * @idx: index to match
1023  *
1024  * Finds the flashnode session object for the passed index
1025  *
1026  * Returns:
1027  *  pointer to found flashnode session object on success
1028  *  %NULL on failure
1029  */
1030 static struct iscsi_bus_flash_session *
1031 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1032 {
1033         struct iscsi_bus_flash_session *fnode_sess = NULL;
1034         struct device *dev;
1035
1036         dev = device_find_child(&shost->shost_gendev, &idx,
1037                                 flashnode_match_index);
1038         if (dev)
1039                 fnode_sess = iscsi_dev_to_flash_session(dev);
1040
1041         return fnode_sess;
1042 }
1043
1044 /**
1045  * iscsi_find_flashnode_sess - finds flashnode session entry
1046  * @shost: pointer to host data
1047  * @data: pointer to data containing value to use for comparison
1048  * @fn: function pointer that does actual comparison
1049  *
1050  * Finds the flashnode session object comparing the data passed using logic
1051  * defined in passed function pointer
1052  *
1053  * Returns:
1054  *  pointer to found flashnode session device object on success
1055  *  %NULL on failure
1056  */
1057 struct device *
1058 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1059                           int (*fn)(struct device *dev, void *data))
1060 {
1061         return device_find_child(&shost->shost_gendev, data, fn);
1062 }
1063 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1064
1065 /**
1066  * iscsi_find_flashnode_conn - finds flashnode connection entry
1067  * @fnode_sess: pointer to parent flashnode session entry
1068  *
1069  * Finds the flashnode connection object comparing the data passed using logic
1070  * defined in passed function pointer
1071  *
1072  * Returns:
1073  *  pointer to found flashnode connection device object on success
1074  *  %NULL on failure
1075  */
1076 struct device *
1077 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1078 {
1079         return device_find_child(&fnode_sess->dev, NULL,
1080                                  iscsi_is_flashnode_conn_dev);
1081 }
1082 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1083
1084 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1085 {
1086         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1087                 return 0;
1088
1089         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1090 }
1091
1092 /**
1093  * iscsi_destroy_flashnode_sess - destory flashnode session entry
1094  * @fnode_sess: pointer to flashnode session entry to be destroyed
1095  *
1096  * Deletes the flashnode session entry and all children flashnode connection
1097  * entries from sysfs
1098  */
1099 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1100 {
1101         int err;
1102
1103         err = device_for_each_child(&fnode_sess->dev, NULL,
1104                                     iscsi_iter_destroy_flashnode_conn_fn);
1105         if (err)
1106                 pr_err("Could not delete all connections for %s. Error %d.\n",
1107                        fnode_sess->dev.kobj.name, err);
1108
1109         device_unregister(&fnode_sess->dev);
1110 }
1111 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1112
1113 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1114 {
1115         if (!iscsi_flashnode_bus_match(dev, NULL))
1116                 return 0;
1117
1118         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1119         return 0;
1120 }
1121
1122 /**
1123  * iscsi_destroy_all_flashnode - destory all flashnode session entries
1124  * @shost: pointer to host data
1125  *
1126  * Destroys all the flashnode session entries and all corresponding children
1127  * flashnode connection entries from sysfs
1128  */
1129 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1130 {
1131         device_for_each_child(&shost->shost_gendev, NULL,
1132                               iscsi_iter_destroy_flashnode_fn);
1133 }
1134 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1135
1136 /*
1137  * BSG support
1138  */
1139 /**
1140  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1141  * @job: bsg job to be processed
1142  */
1143 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1144 {
1145         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1146         struct iscsi_bsg_request *req = job->request;
1147         struct iscsi_bsg_reply *reply = job->reply;
1148         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1149         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1150         int ret;
1151
1152         /* check if we have the msgcode value at least */
1153         if (job->request_len < sizeof(uint32_t)) {
1154                 ret = -ENOMSG;
1155                 goto fail_host_msg;
1156         }
1157
1158         /* Validate the host command */
1159         switch (req->msgcode) {
1160         case ISCSI_BSG_HST_VENDOR:
1161                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1162                 if ((shost->hostt->vendor_id == 0L) ||
1163                     (req->rqst_data.h_vendor.vendor_id !=
1164                         shost->hostt->vendor_id)) {
1165                         ret = -ESRCH;
1166                         goto fail_host_msg;
1167                 }
1168                 break;
1169         default:
1170                 ret = -EBADR;
1171                 goto fail_host_msg;
1172         }
1173
1174         /* check if we really have all the request data needed */
1175         if (job->request_len < cmdlen) {
1176                 ret = -ENOMSG;
1177                 goto fail_host_msg;
1178         }
1179
1180         ret = i->iscsi_transport->bsg_request(job);
1181         if (!ret)
1182                 return 0;
1183
1184 fail_host_msg:
1185         /* return the errno failure code as the only status */
1186         BUG_ON(job->reply_len < sizeof(uint32_t));
1187         reply->reply_payload_rcv_len = 0;
1188         reply->result = ret;
1189         job->reply_len = sizeof(uint32_t);
1190         bsg_job_done(job, ret, 0);
1191         return 0;
1192 }
1193
1194 /**
1195  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1196  * @shost: shost for iscsi_host
1197  * @ihost: iscsi_cls_host adding the structures to
1198  */
1199 static int
1200 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1201 {
1202         struct device *dev = &shost->shost_gendev;
1203         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1204         struct request_queue *q;
1205         char bsg_name[20];
1206         int ret;
1207
1208         if (!i->iscsi_transport->bsg_request)
1209                 return -ENOTSUPP;
1210
1211         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1212
1213         q = __scsi_alloc_queue(shost, bsg_request_fn);
1214         if (!q)
1215                 return -ENOMEM;
1216
1217         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
1218         if (ret) {
1219                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1220                              "initialize - no request queue\n");
1221                 blk_cleanup_queue(q);
1222                 return ret;
1223         }
1224
1225         ihost->bsg_q = q;
1226         return 0;
1227 }
1228
1229 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1230                             struct device *cdev)
1231 {
1232         struct Scsi_Host *shost = dev_to_shost(dev);
1233         struct iscsi_cls_host *ihost = shost->shost_data;
1234
1235         memset(ihost, 0, sizeof(*ihost));
1236         atomic_set(&ihost->nr_scans, 0);
1237         mutex_init(&ihost->mutex);
1238
1239         iscsi_bsg_host_add(shost, ihost);
1240         /* ignore any bsg add error - we just can't do sgio */
1241
1242         return 0;
1243 }
1244
1245 static int iscsi_remove_host(struct transport_container *tc,
1246                              struct device *dev, struct device *cdev)
1247 {
1248         struct Scsi_Host *shost = dev_to_shost(dev);
1249         struct iscsi_cls_host *ihost = shost->shost_data;
1250
1251         if (ihost->bsg_q) {
1252                 bsg_unregister_queue(ihost->bsg_q);
1253                 blk_cleanup_queue(ihost->bsg_q);
1254         }
1255         return 0;
1256 }
1257
1258 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1259                                "iscsi_host",
1260                                iscsi_setup_host,
1261                                iscsi_remove_host,
1262                                NULL);
1263
1264 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1265                                "iscsi_session",
1266                                NULL,
1267                                NULL,
1268                                NULL);
1269
1270 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1271                                "iscsi_connection",
1272                                NULL,
1273                                NULL,
1274                                NULL);
1275
1276 static struct sock *nls;
1277 static DEFINE_MUTEX(rx_queue_mutex);
1278
1279 static LIST_HEAD(sesslist);
1280 static DEFINE_SPINLOCK(sesslock);
1281 static LIST_HEAD(connlist);
1282 static DEFINE_SPINLOCK(connlock);
1283
1284 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1285 {
1286         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1287         return sess->sid;
1288 }
1289
1290 /*
1291  * Returns the matching session to a given sid
1292  */
1293 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1294 {
1295         unsigned long flags;
1296         struct iscsi_cls_session *sess;
1297
1298         spin_lock_irqsave(&sesslock, flags);
1299         list_for_each_entry(sess, &sesslist, sess_list) {
1300                 if (sess->sid == sid) {
1301                         spin_unlock_irqrestore(&sesslock, flags);
1302                         return sess;
1303                 }
1304         }
1305         spin_unlock_irqrestore(&sesslock, flags);
1306         return NULL;
1307 }
1308
1309 /*
1310  * Returns the matching connection to a given sid / cid tuple
1311  */
1312 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1313 {
1314         unsigned long flags;
1315         struct iscsi_cls_conn *conn;
1316
1317         spin_lock_irqsave(&connlock, flags);
1318         list_for_each_entry(conn, &connlist, conn_list) {
1319                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1320                         spin_unlock_irqrestore(&connlock, flags);
1321                         return conn;
1322                 }
1323         }
1324         spin_unlock_irqrestore(&connlock, flags);
1325         return NULL;
1326 }
1327
1328 /*
1329  * The following functions can be used by LLDs that allocate
1330  * their own scsi_hosts or by software iscsi LLDs
1331  */
1332 static struct {
1333         int value;
1334         char *name;
1335 } iscsi_session_state_names[] = {
1336         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1337         { ISCSI_SESSION_FAILED,         "FAILED" },
1338         { ISCSI_SESSION_FREE,           "FREE" },
1339 };
1340
1341 static const char *iscsi_session_state_name(int state)
1342 {
1343         int i;
1344         char *name = NULL;
1345
1346         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1347                 if (iscsi_session_state_names[i].value == state) {
1348                         name = iscsi_session_state_names[i].name;
1349                         break;
1350                 }
1351         }
1352         return name;
1353 }
1354
1355 int iscsi_session_chkready(struct iscsi_cls_session *session)
1356 {
1357         unsigned long flags;
1358         int err;
1359
1360         spin_lock_irqsave(&session->lock, flags);
1361         switch (session->state) {
1362         case ISCSI_SESSION_LOGGED_IN:
1363                 err = 0;
1364                 break;
1365         case ISCSI_SESSION_FAILED:
1366                 err = DID_IMM_RETRY << 16;
1367                 break;
1368         case ISCSI_SESSION_FREE:
1369                 err = DID_TRANSPORT_FAILFAST << 16;
1370                 break;
1371         default:
1372                 err = DID_NO_CONNECT << 16;
1373                 break;
1374         }
1375         spin_unlock_irqrestore(&session->lock, flags);
1376         return err;
1377 }
1378 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1379
1380 int iscsi_is_session_online(struct iscsi_cls_session *session)
1381 {
1382         unsigned long flags;
1383         int ret = 0;
1384
1385         spin_lock_irqsave(&session->lock, flags);
1386         if (session->state == ISCSI_SESSION_LOGGED_IN)
1387                 ret = 1;
1388         spin_unlock_irqrestore(&session->lock, flags);
1389         return ret;
1390 }
1391 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1392
1393 static void iscsi_session_release(struct device *dev)
1394 {
1395         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1396         struct Scsi_Host *shost;
1397
1398         shost = iscsi_session_to_shost(session);
1399         scsi_host_put(shost);
1400         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1401         kfree(session);
1402 }
1403
1404 int iscsi_is_session_dev(const struct device *dev)
1405 {
1406         return dev->release == iscsi_session_release;
1407 }
1408 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1409
1410 static int iscsi_iter_session_fn(struct device *dev, void *data)
1411 {
1412         void (* fn) (struct iscsi_cls_session *) = data;
1413
1414         if (!iscsi_is_session_dev(dev))
1415                 return 0;
1416         fn(iscsi_dev_to_session(dev));
1417         return 0;
1418 }
1419
1420 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1421                                  void (*fn)(struct iscsi_cls_session *))
1422 {
1423         device_for_each_child(&shost->shost_gendev, fn,
1424                               iscsi_iter_session_fn);
1425 }
1426 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1427
1428 /**
1429  * iscsi_scan_finished - helper to report when running scans are done
1430  * @shost: scsi host
1431  * @time: scan run time
1432  *
1433  * This function can be used by drives like qla4xxx to report to the scsi
1434  * layer when the scans it kicked off at module load time are done.
1435  */
1436 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1437 {
1438         struct iscsi_cls_host *ihost = shost->shost_data;
1439         /*
1440          * qla4xxx will have kicked off some session unblocks before calling
1441          * scsi_scan_host, so just wait for them to complete.
1442          */
1443         return !atomic_read(&ihost->nr_scans);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1446
1447 struct iscsi_scan_data {
1448         unsigned int channel;
1449         unsigned int id;
1450         unsigned int lun;
1451 };
1452
1453 static int iscsi_user_scan_session(struct device *dev, void *data)
1454 {
1455         struct iscsi_scan_data *scan_data = data;
1456         struct iscsi_cls_session *session;
1457         struct Scsi_Host *shost;
1458         struct iscsi_cls_host *ihost;
1459         unsigned long flags;
1460         unsigned int id;
1461
1462         if (!iscsi_is_session_dev(dev))
1463                 return 0;
1464
1465         session = iscsi_dev_to_session(dev);
1466
1467         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1468
1469         shost = iscsi_session_to_shost(session);
1470         ihost = shost->shost_data;
1471
1472         mutex_lock(&ihost->mutex);
1473         spin_lock_irqsave(&session->lock, flags);
1474         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1475                 spin_unlock_irqrestore(&session->lock, flags);
1476                 goto user_scan_exit;
1477         }
1478         id = session->target_id;
1479         spin_unlock_irqrestore(&session->lock, flags);
1480
1481         if (id != ISCSI_MAX_TARGET) {
1482                 if ((scan_data->channel == SCAN_WILD_CARD ||
1483                      scan_data->channel == 0) &&
1484                     (scan_data->id == SCAN_WILD_CARD ||
1485                      scan_data->id == id))
1486                         scsi_scan_target(&session->dev, 0, id,
1487                                          scan_data->lun, 1);
1488         }
1489
1490 user_scan_exit:
1491         mutex_unlock(&ihost->mutex);
1492         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1493         return 0;
1494 }
1495
1496 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1497                            uint id, uint lun)
1498 {
1499         struct iscsi_scan_data scan_data;
1500
1501         scan_data.channel = channel;
1502         scan_data.id = id;
1503         scan_data.lun = lun;
1504
1505         return device_for_each_child(&shost->shost_gendev, &scan_data,
1506                                      iscsi_user_scan_session);
1507 }
1508
1509 static void iscsi_scan_session(struct work_struct *work)
1510 {
1511         struct iscsi_cls_session *session =
1512                         container_of(work, struct iscsi_cls_session, scan_work);
1513         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1514         struct iscsi_cls_host *ihost = shost->shost_data;
1515         struct iscsi_scan_data scan_data;
1516
1517         scan_data.channel = 0;
1518         scan_data.id = SCAN_WILD_CARD;
1519         scan_data.lun = SCAN_WILD_CARD;
1520
1521         iscsi_user_scan_session(&session->dev, &scan_data);
1522         atomic_dec(&ihost->nr_scans);
1523 }
1524
1525 /**
1526  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1527  * @cmd: scsi cmd passed to scsi eh handler
1528  *
1529  * If the session is down this function will wait for the recovery
1530  * timer to fire or for the session to be logged back in. If the
1531  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1532  * should pass this error value to the scsi eh.
1533  */
1534 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1535 {
1536         struct iscsi_cls_session *session =
1537                         starget_to_session(scsi_target(cmd->device));
1538         unsigned long flags;
1539         int ret = 0;
1540
1541         spin_lock_irqsave(&session->lock, flags);
1542         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1543                 if (session->state == ISCSI_SESSION_FREE) {
1544                         ret = FAST_IO_FAIL;
1545                         break;
1546                 }
1547                 spin_unlock_irqrestore(&session->lock, flags);
1548                 msleep(1000);
1549                 spin_lock_irqsave(&session->lock, flags);
1550         }
1551         spin_unlock_irqrestore(&session->lock, flags);
1552         return ret;
1553 }
1554 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1555
1556 static void session_recovery_timedout(struct work_struct *work)
1557 {
1558         struct iscsi_cls_session *session =
1559                 container_of(work, struct iscsi_cls_session,
1560                              recovery_work.work);
1561         unsigned long flags;
1562
1563         iscsi_cls_session_printk(KERN_INFO, session,
1564                                  "session recovery timed out after %d secs\n",
1565                                  session->recovery_tmo);
1566
1567         spin_lock_irqsave(&session->lock, flags);
1568         switch (session->state) {
1569         case ISCSI_SESSION_FAILED:
1570                 session->state = ISCSI_SESSION_FREE;
1571                 break;
1572         case ISCSI_SESSION_LOGGED_IN:
1573         case ISCSI_SESSION_FREE:
1574                 /* we raced with the unblock's flush */
1575                 spin_unlock_irqrestore(&session->lock, flags);
1576                 return;
1577         }
1578         spin_unlock_irqrestore(&session->lock, flags);
1579
1580         if (session->transport->session_recovery_timedout)
1581                 session->transport->session_recovery_timedout(session);
1582
1583         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1584         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1585         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1586 }
1587
1588 static void __iscsi_unblock_session(struct work_struct *work)
1589 {
1590         struct iscsi_cls_session *session =
1591                         container_of(work, struct iscsi_cls_session,
1592                                      unblock_work);
1593         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1594         struct iscsi_cls_host *ihost = shost->shost_data;
1595         unsigned long flags;
1596
1597         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1598         /*
1599          * The recovery and unblock work get run from the same workqueue,
1600          * so try to cancel it if it was going to run after this unblock.
1601          */
1602         cancel_delayed_work(&session->recovery_work);
1603         spin_lock_irqsave(&session->lock, flags);
1604         session->state = ISCSI_SESSION_LOGGED_IN;
1605         spin_unlock_irqrestore(&session->lock, flags);
1606         /* start IO */
1607         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1608         /*
1609          * Only do kernel scanning if the driver is properly hooked into
1610          * the async scanning code (drivers like iscsi_tcp do login and
1611          * scanning from userspace).
1612          */
1613         if (shost->hostt->scan_finished) {
1614                 if (scsi_queue_work(shost, &session->scan_work))
1615                         atomic_inc(&ihost->nr_scans);
1616         }
1617         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1618 }
1619
1620 /**
1621  * iscsi_unblock_session - set a session as logged in and start IO.
1622  * @session: iscsi session
1623  *
1624  * Mark a session as ready to accept IO.
1625  */
1626 void iscsi_unblock_session(struct iscsi_cls_session *session)
1627 {
1628         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1629         /*
1630          * make sure all the events have completed before tell the driver
1631          * it is safe
1632          */
1633         flush_workqueue(iscsi_eh_timer_workq);
1634 }
1635 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1636
1637 static void __iscsi_block_session(struct work_struct *work)
1638 {
1639         struct iscsi_cls_session *session =
1640                         container_of(work, struct iscsi_cls_session,
1641                                      block_work);
1642         unsigned long flags;
1643
1644         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1645         spin_lock_irqsave(&session->lock, flags);
1646         session->state = ISCSI_SESSION_FAILED;
1647         spin_unlock_irqrestore(&session->lock, flags);
1648         scsi_target_block(&session->dev);
1649         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1650         if (session->recovery_tmo >= 0)
1651                 queue_delayed_work(iscsi_eh_timer_workq,
1652                                    &session->recovery_work,
1653                                    session->recovery_tmo * HZ);
1654 }
1655
1656 void iscsi_block_session(struct iscsi_cls_session *session)
1657 {
1658         queue_work(iscsi_eh_timer_workq, &session->block_work);
1659 }
1660 EXPORT_SYMBOL_GPL(iscsi_block_session);
1661
1662 static void __iscsi_unbind_session(struct work_struct *work)
1663 {
1664         struct iscsi_cls_session *session =
1665                         container_of(work, struct iscsi_cls_session,
1666                                      unbind_work);
1667         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1668         struct iscsi_cls_host *ihost = shost->shost_data;
1669         unsigned long flags;
1670         unsigned int target_id;
1671
1672         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1673
1674         /* Prevent new scans and make sure scanning is not in progress */
1675         mutex_lock(&ihost->mutex);
1676         spin_lock_irqsave(&session->lock, flags);
1677         if (session->target_id == ISCSI_MAX_TARGET) {
1678                 spin_unlock_irqrestore(&session->lock, flags);
1679                 mutex_unlock(&ihost->mutex);
1680                 return;
1681         }
1682
1683         target_id = session->target_id;
1684         session->target_id = ISCSI_MAX_TARGET;
1685         spin_unlock_irqrestore(&session->lock, flags);
1686         mutex_unlock(&ihost->mutex);
1687
1688         if (session->ida_used)
1689                 ida_simple_remove(&iscsi_sess_ida, target_id);
1690
1691         scsi_remove_target(&session->dev);
1692         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1693         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1694 }
1695
1696 struct iscsi_cls_session *
1697 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1698                     int dd_size)
1699 {
1700         struct iscsi_cls_session *session;
1701
1702         session = kzalloc(sizeof(*session) + dd_size,
1703                           GFP_KERNEL);
1704         if (!session)
1705                 return NULL;
1706
1707         session->transport = transport;
1708         session->creator = -1;
1709         session->recovery_tmo = 120;
1710         session->state = ISCSI_SESSION_FREE;
1711         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1712         INIT_LIST_HEAD(&session->sess_list);
1713         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1714         INIT_WORK(&session->block_work, __iscsi_block_session);
1715         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1716         INIT_WORK(&session->scan_work, iscsi_scan_session);
1717         spin_lock_init(&session->lock);
1718
1719         /* this is released in the dev's release function */
1720         scsi_host_get(shost);
1721         session->dev.parent = &shost->shost_gendev;
1722         session->dev.release = iscsi_session_release;
1723         device_initialize(&session->dev);
1724         if (dd_size)
1725                 session->dd_data = &session[1];
1726
1727         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1728         return session;
1729 }
1730 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1731
1732 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1733 {
1734         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1735         struct iscsi_cls_host *ihost;
1736         unsigned long flags;
1737         int id = 0;
1738         int err;
1739
1740         ihost = shost->shost_data;
1741         session->sid = atomic_add_return(1, &iscsi_session_nr);
1742
1743         if (target_id == ISCSI_MAX_TARGET) {
1744                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
1745
1746                 if (id < 0) {
1747                         iscsi_cls_session_printk(KERN_ERR, session,
1748                                         "Failure in Target ID Allocation\n");
1749                         return id;
1750                 }
1751                 session->target_id = (unsigned int)id;
1752                 session->ida_used = true;
1753         } else
1754                 session->target_id = target_id;
1755
1756         dev_set_name(&session->dev, "session%u", session->sid);
1757         err = device_add(&session->dev);
1758         if (err) {
1759                 iscsi_cls_session_printk(KERN_ERR, session,
1760                                          "could not register session's dev\n");
1761                 goto release_ida;
1762         }
1763         transport_register_device(&session->dev);
1764
1765         spin_lock_irqsave(&sesslock, flags);
1766         list_add(&session->sess_list, &sesslist);
1767         spin_unlock_irqrestore(&sesslock, flags);
1768
1769         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1770         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1771         return 0;
1772
1773 release_ida:
1774         if (session->ida_used)
1775                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
1776
1777         return err;
1778 }
1779 EXPORT_SYMBOL_GPL(iscsi_add_session);
1780
1781 /**
1782  * iscsi_create_session - create iscsi class session
1783  * @shost: scsi host
1784  * @transport: iscsi transport
1785  * @dd_size: private driver data size
1786  * @target_id: which target
1787  *
1788  * This can be called from a LLD or iscsi_transport.
1789  */
1790 struct iscsi_cls_session *
1791 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1792                      int dd_size, unsigned int target_id)
1793 {
1794         struct iscsi_cls_session *session;
1795
1796         session = iscsi_alloc_session(shost, transport, dd_size);
1797         if (!session)
1798                 return NULL;
1799
1800         if (iscsi_add_session(session, target_id)) {
1801                 iscsi_free_session(session);
1802                 return NULL;
1803         }
1804         return session;
1805 }
1806 EXPORT_SYMBOL_GPL(iscsi_create_session);
1807
1808 static void iscsi_conn_release(struct device *dev)
1809 {
1810         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1811         struct device *parent = conn->dev.parent;
1812
1813         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1814         kfree(conn);
1815         put_device(parent);
1816 }
1817
1818 static int iscsi_is_conn_dev(const struct device *dev)
1819 {
1820         return dev->release == iscsi_conn_release;
1821 }
1822
1823 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1824 {
1825         if (!iscsi_is_conn_dev(dev))
1826                 return 0;
1827         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1828 }
1829
1830 void iscsi_remove_session(struct iscsi_cls_session *session)
1831 {
1832         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1833         unsigned long flags;
1834         int err;
1835
1836         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1837
1838         spin_lock_irqsave(&sesslock, flags);
1839         list_del(&session->sess_list);
1840         spin_unlock_irqrestore(&sesslock, flags);
1841
1842         /* make sure there are no blocks/unblocks queued */
1843         flush_workqueue(iscsi_eh_timer_workq);
1844         /* make sure the timedout callout is not running */
1845         if (!cancel_delayed_work(&session->recovery_work))
1846                 flush_workqueue(iscsi_eh_timer_workq);
1847         /*
1848          * If we are blocked let commands flow again. The lld or iscsi
1849          * layer should set up the queuecommand to fail commands.
1850          * We assume that LLD will not be calling block/unblock while
1851          * removing the session.
1852          */
1853         spin_lock_irqsave(&session->lock, flags);
1854         session->state = ISCSI_SESSION_FREE;
1855         spin_unlock_irqrestore(&session->lock, flags);
1856
1857         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1858         /* flush running scans then delete devices */
1859         scsi_flush_work(shost);
1860         __iscsi_unbind_session(&session->unbind_work);
1861
1862         /* hw iscsi may not have removed all connections from session */
1863         err = device_for_each_child(&session->dev, NULL,
1864                                     iscsi_iter_destroy_conn_fn);
1865         if (err)
1866                 iscsi_cls_session_printk(KERN_ERR, session,
1867                                          "Could not delete all connections "
1868                                          "for session. Error %d.\n", err);
1869
1870         transport_unregister_device(&session->dev);
1871
1872         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1873         device_del(&session->dev);
1874 }
1875 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1876
1877 void iscsi_free_session(struct iscsi_cls_session *session)
1878 {
1879         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1880         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1881         put_device(&session->dev);
1882 }
1883 EXPORT_SYMBOL_GPL(iscsi_free_session);
1884
1885 /**
1886  * iscsi_destroy_session - destroy iscsi session
1887  * @session: iscsi_session
1888  *
1889  * Can be called by a LLD or iscsi_transport. There must not be
1890  * any running connections.
1891  */
1892 int iscsi_destroy_session(struct iscsi_cls_session *session)
1893 {
1894         iscsi_remove_session(session);
1895         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1896         iscsi_free_session(session);
1897         return 0;
1898 }
1899 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1900
1901 /**
1902  * iscsi_create_conn - create iscsi class connection
1903  * @session: iscsi cls session
1904  * @dd_size: private driver data size
1905  * @cid: connection id
1906  *
1907  * This can be called from a LLD or iscsi_transport. The connection
1908  * is child of the session so cid must be unique for all connections
1909  * on the session.
1910  *
1911  * Since we do not support MCS, cid will normally be zero. In some cases
1912  * for software iscsi we could be trying to preallocate a connection struct
1913  * in which case there could be two connection structs and cid would be
1914  * non-zero.
1915  */
1916 struct iscsi_cls_conn *
1917 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1918 {
1919         struct iscsi_transport *transport = session->transport;
1920         struct iscsi_cls_conn *conn;
1921         unsigned long flags;
1922         int err;
1923
1924         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1925         if (!conn)
1926                 return NULL;
1927         if (dd_size)
1928                 conn->dd_data = &conn[1];
1929
1930         mutex_init(&conn->ep_mutex);
1931         INIT_LIST_HEAD(&conn->conn_list);
1932         conn->transport = transport;
1933         conn->cid = cid;
1934
1935         /* this is released in the dev's release function */
1936         if (!get_device(&session->dev))
1937                 goto free_conn;
1938
1939         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1940         conn->dev.parent = &session->dev;
1941         conn->dev.release = iscsi_conn_release;
1942         err = device_register(&conn->dev);
1943         if (err) {
1944                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1945                                          "register connection's dev\n");
1946                 goto release_parent_ref;
1947         }
1948         transport_register_device(&conn->dev);
1949
1950         spin_lock_irqsave(&connlock, flags);
1951         list_add(&conn->conn_list, &connlist);
1952         spin_unlock_irqrestore(&connlock, flags);
1953
1954         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1955         return conn;
1956
1957 release_parent_ref:
1958         put_device(&session->dev);
1959 free_conn:
1960         kfree(conn);
1961         return NULL;
1962 }
1963
1964 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1965
1966 /**
1967  * iscsi_destroy_conn - destroy iscsi class connection
1968  * @conn: iscsi cls session
1969  *
1970  * This can be called from a LLD or iscsi_transport.
1971  */
1972 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1973 {
1974         unsigned long flags;
1975
1976         spin_lock_irqsave(&connlock, flags);
1977         list_del(&conn->conn_list);
1978         spin_unlock_irqrestore(&connlock, flags);
1979
1980         transport_unregister_device(&conn->dev);
1981         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1982         device_unregister(&conn->dev);
1983         return 0;
1984 }
1985 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1986
1987 /*
1988  * iscsi interface functions
1989  */
1990 static struct iscsi_internal *
1991 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1992 {
1993         struct iscsi_internal *priv;
1994         unsigned long flags;
1995
1996         spin_lock_irqsave(&iscsi_transport_lock, flags);
1997         list_for_each_entry(priv, &iscsi_transports, list) {
1998                 if (tt == priv->iscsi_transport) {
1999                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2000                         return priv;
2001                 }
2002         }
2003         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2004         return NULL;
2005 }
2006
2007 static int
2008 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2009 {
2010         return nlmsg_multicast(nls, skb, 0, group, gfp);
2011 }
2012
2013 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2014                    char *data, uint32_t data_size)
2015 {
2016         struct nlmsghdr *nlh;
2017         struct sk_buff *skb;
2018         struct iscsi_uevent *ev;
2019         char *pdu;
2020         struct iscsi_internal *priv;
2021         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2022                                    data_size);
2023
2024         priv = iscsi_if_transport_lookup(conn->transport);
2025         if (!priv)
2026                 return -EINVAL;
2027
2028         skb = alloc_skb(len, GFP_ATOMIC);
2029         if (!skb) {
2030                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2031                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2032                                       "control PDU: OOM\n");
2033                 return -ENOMEM;
2034         }
2035
2036         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2037         ev = nlmsg_data(nlh);
2038         memset(ev, 0, sizeof(*ev));
2039         ev->transport_handle = iscsi_handle(conn->transport);
2040         ev->type = ISCSI_KEVENT_RECV_PDU;
2041         ev->r.recv_req.cid = conn->cid;
2042         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2043         pdu = (char*)ev + sizeof(*ev);
2044         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2045         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2046
2047         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2048 }
2049 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2050
2051 int iscsi_offload_mesg(struct Scsi_Host *shost,
2052                        struct iscsi_transport *transport, uint32_t type,
2053                        char *data, uint16_t data_size)
2054 {
2055         struct nlmsghdr *nlh;
2056         struct sk_buff *skb;
2057         struct iscsi_uevent *ev;
2058         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2059
2060         skb = alloc_skb(len, GFP_ATOMIC);
2061         if (!skb) {
2062                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2063                 return -ENOMEM;
2064         }
2065
2066         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2067         ev = nlmsg_data(nlh);
2068         memset(ev, 0, sizeof(*ev));
2069         ev->type = type;
2070         ev->transport_handle = iscsi_handle(transport);
2071         switch (type) {
2072         case ISCSI_KEVENT_PATH_REQ:
2073                 ev->r.req_path.host_no = shost->host_no;
2074                 break;
2075         case ISCSI_KEVENT_IF_DOWN:
2076                 ev->r.notify_if_down.host_no = shost->host_no;
2077                 break;
2078         }
2079
2080         memcpy((char *)ev + sizeof(*ev), data, data_size);
2081
2082         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2083 }
2084 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2085
2086 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2087 {
2088         struct nlmsghdr *nlh;
2089         struct sk_buff  *skb;
2090         struct iscsi_uevent *ev;
2091         struct iscsi_internal *priv;
2092         int len = nlmsg_total_size(sizeof(*ev));
2093
2094         priv = iscsi_if_transport_lookup(conn->transport);
2095         if (!priv)
2096                 return;
2097
2098         skb = alloc_skb(len, GFP_ATOMIC);
2099         if (!skb) {
2100                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2101                                       "conn error (%d)\n", error);
2102                 return;
2103         }
2104
2105         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2106         ev = nlmsg_data(nlh);
2107         ev->transport_handle = iscsi_handle(conn->transport);
2108         ev->type = ISCSI_KEVENT_CONN_ERROR;
2109         ev->r.connerror.error = error;
2110         ev->r.connerror.cid = conn->cid;
2111         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2112
2113         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2114
2115         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2116                               error);
2117 }
2118 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2119
2120 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2121                             enum iscsi_conn_state state)
2122 {
2123         struct nlmsghdr *nlh;
2124         struct sk_buff  *skb;
2125         struct iscsi_uevent *ev;
2126         struct iscsi_internal *priv;
2127         int len = nlmsg_total_size(sizeof(*ev));
2128
2129         priv = iscsi_if_transport_lookup(conn->transport);
2130         if (!priv)
2131                 return;
2132
2133         skb = alloc_skb(len, GFP_ATOMIC);
2134         if (!skb) {
2135                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2136                                       "conn login (%d)\n", state);
2137                 return;
2138         }
2139
2140         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2141         ev = nlmsg_data(nlh);
2142         ev->transport_handle = iscsi_handle(conn->transport);
2143         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2144         ev->r.conn_login.state = state;
2145         ev->r.conn_login.cid = conn->cid;
2146         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2147         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2148
2149         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2150                               state);
2151 }
2152 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2153
2154 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2155                            enum iscsi_host_event_code code, uint32_t data_size,
2156                            uint8_t *data)
2157 {
2158         struct nlmsghdr *nlh;
2159         struct sk_buff *skb;
2160         struct iscsi_uevent *ev;
2161         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2162
2163         skb = alloc_skb(len, GFP_NOIO);
2164         if (!skb) {
2165                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2166                        host_no, code);
2167                 return;
2168         }
2169
2170         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2171         ev = nlmsg_data(nlh);
2172         ev->transport_handle = iscsi_handle(transport);
2173         ev->type = ISCSI_KEVENT_HOST_EVENT;
2174         ev->r.host_event.host_no = host_no;
2175         ev->r.host_event.code = code;
2176         ev->r.host_event.data_size = data_size;
2177
2178         if (data_size)
2179                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2180
2181         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2182 }
2183 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2184
2185 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2186                            uint32_t status, uint32_t pid, uint32_t data_size,
2187                            uint8_t *data)
2188 {
2189         struct nlmsghdr *nlh;
2190         struct sk_buff *skb;
2191         struct iscsi_uevent *ev;
2192         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2193
2194         skb = alloc_skb(len, GFP_NOIO);
2195         if (!skb) {
2196                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2197                 return;
2198         }
2199
2200         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2201         ev = nlmsg_data(nlh);
2202         ev->transport_handle = iscsi_handle(transport);
2203         ev->type = ISCSI_KEVENT_PING_COMP;
2204         ev->r.ping_comp.host_no = host_no;
2205         ev->r.ping_comp.status = status;
2206         ev->r.ping_comp.pid = pid;
2207         ev->r.ping_comp.data_size = data_size;
2208         memcpy((char *)ev + sizeof(*ev), data, data_size);
2209
2210         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2211 }
2212 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2213
2214 static int
2215 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
2216                     void *payload, int size)
2217 {
2218         struct sk_buff  *skb;
2219         struct nlmsghdr *nlh;
2220         int len = nlmsg_total_size(size);
2221         int flags = multi ? NLM_F_MULTI : 0;
2222         int t = done ? NLMSG_DONE : type;
2223
2224         skb = alloc_skb(len, GFP_ATOMIC);
2225         if (!skb) {
2226                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2227                 return -ENOMEM;
2228         }
2229
2230         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
2231         nlh->nlmsg_flags = flags;
2232         memcpy(nlmsg_data(nlh), payload, size);
2233         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
2234 }
2235
2236 static int
2237 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2238 {
2239         struct iscsi_uevent *ev = nlmsg_data(nlh);
2240         struct iscsi_stats *stats;
2241         struct sk_buff *skbstat;
2242         struct iscsi_cls_conn *conn;
2243         struct nlmsghdr *nlhstat;
2244         struct iscsi_uevent *evstat;
2245         struct iscsi_internal *priv;
2246         int len = nlmsg_total_size(sizeof(*ev) +
2247                                    sizeof(struct iscsi_stats) +
2248                                    sizeof(struct iscsi_stats_custom) *
2249                                    ISCSI_STATS_CUSTOM_MAX);
2250         int err = 0;
2251
2252         priv = iscsi_if_transport_lookup(transport);
2253         if (!priv)
2254                 return -EINVAL;
2255
2256         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2257         if (!conn)
2258                 return -EEXIST;
2259
2260         do {
2261                 int actual_size;
2262
2263                 skbstat = alloc_skb(len, GFP_ATOMIC);
2264                 if (!skbstat) {
2265                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2266                                               "deliver stats: OOM\n");
2267                         return -ENOMEM;
2268                 }
2269
2270                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2271                                       (len - sizeof(*nlhstat)), 0);
2272                 evstat = nlmsg_data(nlhstat);
2273                 memset(evstat, 0, sizeof(*evstat));
2274                 evstat->transport_handle = iscsi_handle(conn->transport);
2275                 evstat->type = nlh->nlmsg_type;
2276                 evstat->u.get_stats.cid =
2277                         ev->u.get_stats.cid;
2278                 evstat->u.get_stats.sid =
2279                         ev->u.get_stats.sid;
2280                 stats = (struct iscsi_stats *)
2281                         ((char*)evstat + sizeof(*evstat));
2282                 memset(stats, 0, sizeof(*stats));
2283
2284                 transport->get_stats(conn, stats);
2285                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2286                                                sizeof(struct iscsi_stats) +
2287                                                sizeof(struct iscsi_stats_custom) *
2288                                                stats->custom_length);
2289                 actual_size -= sizeof(*nlhstat);
2290                 actual_size = nlmsg_msg_size(actual_size);
2291                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2292                 nlhstat->nlmsg_len = actual_size;
2293
2294                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2295                                           GFP_ATOMIC);
2296         } while (err < 0 && err != -ECONNREFUSED);
2297
2298         return err;
2299 }
2300
2301 /**
2302  * iscsi_session_event - send session destr. completion event
2303  * @session: iscsi class session
2304  * @event: type of event
2305  */
2306 int iscsi_session_event(struct iscsi_cls_session *session,
2307                         enum iscsi_uevent_e event)
2308 {
2309         struct iscsi_internal *priv;
2310         struct Scsi_Host *shost;
2311         struct iscsi_uevent *ev;
2312         struct sk_buff  *skb;
2313         struct nlmsghdr *nlh;
2314         int rc, len = nlmsg_total_size(sizeof(*ev));
2315
2316         priv = iscsi_if_transport_lookup(session->transport);
2317         if (!priv)
2318                 return -EINVAL;
2319         shost = iscsi_session_to_shost(session);
2320
2321         skb = alloc_skb(len, GFP_KERNEL);
2322         if (!skb) {
2323                 iscsi_cls_session_printk(KERN_ERR, session,
2324                                          "Cannot notify userspace of session "
2325                                          "event %u\n", event);
2326                 return -ENOMEM;
2327         }
2328
2329         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2330         ev = nlmsg_data(nlh);
2331         ev->transport_handle = iscsi_handle(session->transport);
2332
2333         ev->type = event;
2334         switch (event) {
2335         case ISCSI_KEVENT_DESTROY_SESSION:
2336                 ev->r.d_session.host_no = shost->host_no;
2337                 ev->r.d_session.sid = session->sid;
2338                 break;
2339         case ISCSI_KEVENT_CREATE_SESSION:
2340                 ev->r.c_session_ret.host_no = shost->host_no;
2341                 ev->r.c_session_ret.sid = session->sid;
2342                 break;
2343         case ISCSI_KEVENT_UNBIND_SESSION:
2344                 ev->r.unbind_session.host_no = shost->host_no;
2345                 ev->r.unbind_session.sid = session->sid;
2346                 break;
2347         default:
2348                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2349                                          "%u.\n", event);
2350                 kfree_skb(skb);
2351                 return -EINVAL;
2352         }
2353
2354         /*
2355          * this will occur if the daemon is not up, so we just warn
2356          * the user and when the daemon is restarted it will handle it
2357          */
2358         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2359         if (rc == -ESRCH)
2360                 iscsi_cls_session_printk(KERN_ERR, session,
2361                                          "Cannot notify userspace of session "
2362                                          "event %u. Check iscsi daemon\n",
2363                                          event);
2364
2365         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2366                                 event, rc);
2367         return rc;
2368 }
2369 EXPORT_SYMBOL_GPL(iscsi_session_event);
2370
2371 static int
2372 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2373                         struct iscsi_uevent *ev, pid_t pid,
2374                         uint32_t initial_cmdsn, uint16_t cmds_max,
2375                         uint16_t queue_depth)
2376 {
2377         struct iscsi_transport *transport = priv->iscsi_transport;
2378         struct iscsi_cls_session *session;
2379         struct Scsi_Host *shost;
2380
2381         session = transport->create_session(ep, cmds_max, queue_depth,
2382                                             initial_cmdsn);
2383         if (!session)
2384                 return -ENOMEM;
2385
2386         session->creator = pid;
2387         shost = iscsi_session_to_shost(session);
2388         ev->r.c_session_ret.host_no = shost->host_no;
2389         ev->r.c_session_ret.sid = session->sid;
2390         ISCSI_DBG_TRANS_SESSION(session,
2391                                 "Completed creating transport session\n");
2392         return 0;
2393 }
2394
2395 static int
2396 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2397 {
2398         struct iscsi_cls_conn *conn;
2399         struct iscsi_cls_session *session;
2400
2401         session = iscsi_session_lookup(ev->u.c_conn.sid);
2402         if (!session) {
2403                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2404                        ev->u.c_conn.sid);
2405                 return -EINVAL;
2406         }
2407
2408         conn = transport->create_conn(session, ev->u.c_conn.cid);
2409         if (!conn) {
2410                 iscsi_cls_session_printk(KERN_ERR, session,
2411                                          "couldn't create a new connection.");
2412                 return -ENOMEM;
2413         }
2414
2415         ev->r.c_conn_ret.sid = session->sid;
2416         ev->r.c_conn_ret.cid = conn->cid;
2417
2418         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2419         return 0;
2420 }
2421
2422 static int
2423 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2424 {
2425         struct iscsi_cls_conn *conn;
2426
2427         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2428         if (!conn)
2429                 return -EINVAL;
2430
2431         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2432         if (transport->destroy_conn)
2433                 transport->destroy_conn(conn);
2434
2435         return 0;
2436 }
2437
2438 static int
2439 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2440 {
2441         char *data = (char*)ev + sizeof(*ev);
2442         struct iscsi_cls_conn *conn;
2443         struct iscsi_cls_session *session;
2444         int err = 0, value = 0;
2445
2446         session = iscsi_session_lookup(ev->u.set_param.sid);
2447         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2448         if (!conn || !session)
2449                 return -EINVAL;
2450
2451         switch (ev->u.set_param.param) {
2452         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2453                 sscanf(data, "%d", &value);
2454                 session->recovery_tmo = value;
2455                 break;
2456         default:
2457                 err = transport->set_param(conn, ev->u.set_param.param,
2458                                            data, ev->u.set_param.len);
2459         }
2460
2461         return err;
2462 }
2463
2464 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2465                                struct iscsi_uevent *ev, int msg_type)
2466 {
2467         struct iscsi_endpoint *ep;
2468         struct sockaddr *dst_addr;
2469         struct Scsi_Host *shost = NULL;
2470         int non_blocking, err = 0;
2471
2472         if (!transport->ep_connect)
2473                 return -EINVAL;
2474
2475         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2476                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2477                 if (!shost) {
2478                         printk(KERN_ERR "ep connect failed. Could not find "
2479                                "host no %u\n",
2480                                ev->u.ep_connect_through_host.host_no);
2481                         return -ENODEV;
2482                 }
2483                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2484         } else
2485                 non_blocking = ev->u.ep_connect.non_blocking;
2486
2487         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2488         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2489         if (IS_ERR(ep)) {
2490                 err = PTR_ERR(ep);
2491                 goto release_host;
2492         }
2493
2494         ev->r.ep_connect_ret.handle = ep->id;
2495 release_host:
2496         if (shost)
2497                 scsi_host_put(shost);
2498         return err;
2499 }
2500
2501 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2502                                   u64 ep_handle)
2503 {
2504         struct iscsi_cls_conn *conn;
2505         struct iscsi_endpoint *ep;
2506
2507         if (!transport->ep_disconnect)
2508                 return -EINVAL;
2509
2510         ep = iscsi_lookup_endpoint(ep_handle);
2511         if (!ep)
2512                 return -EINVAL;
2513         conn = ep->conn;
2514         if (conn) {
2515                 mutex_lock(&conn->ep_mutex);
2516                 conn->ep = NULL;
2517                 mutex_unlock(&conn->ep_mutex);
2518         }
2519
2520         transport->ep_disconnect(ep);
2521         return 0;
2522 }
2523
2524 static int
2525 iscsi_if_transport_ep(struct iscsi_transport *transport,
2526                       struct iscsi_uevent *ev, int msg_type)
2527 {
2528         struct iscsi_endpoint *ep;
2529         int rc = 0;
2530
2531         switch (msg_type) {
2532         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2533         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2534                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2535                 break;
2536         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2537                 if (!transport->ep_poll)
2538                         return -EINVAL;
2539
2540                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2541                 if (!ep)
2542                         return -EINVAL;
2543
2544                 ev->r.retcode = transport->ep_poll(ep,
2545                                                    ev->u.ep_poll.timeout_ms);
2546                 break;
2547         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2548                 rc = iscsi_if_ep_disconnect(transport,
2549                                             ev->u.ep_disconnect.ep_handle);
2550                 break;
2551         }
2552         return rc;
2553 }
2554
2555 static int
2556 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2557                 struct iscsi_uevent *ev)
2558 {
2559         struct Scsi_Host *shost;
2560         struct sockaddr *dst_addr;
2561         int err;
2562
2563         if (!transport->tgt_dscvr)
2564                 return -EINVAL;
2565
2566         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2567         if (!shost) {
2568                 printk(KERN_ERR "target discovery could not find host no %u\n",
2569                        ev->u.tgt_dscvr.host_no);
2570                 return -ENODEV;
2571         }
2572
2573
2574         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2575         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2576                                    ev->u.tgt_dscvr.enable, dst_addr);
2577         scsi_host_put(shost);
2578         return err;
2579 }
2580
2581 static int
2582 iscsi_set_host_param(struct iscsi_transport *transport,
2583                      struct iscsi_uevent *ev)
2584 {
2585         char *data = (char*)ev + sizeof(*ev);
2586         struct Scsi_Host *shost;
2587         int err;
2588
2589         if (!transport->set_host_param)
2590                 return -ENOSYS;
2591
2592         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2593         if (!shost) {
2594                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2595                        ev->u.set_host_param.host_no);
2596                 return -ENODEV;
2597         }
2598
2599         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2600                                         data, ev->u.set_host_param.len);
2601         scsi_host_put(shost);
2602         return err;
2603 }
2604
2605 static int
2606 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2607 {
2608         struct Scsi_Host *shost;
2609         struct iscsi_path *params;
2610         int err;
2611
2612         if (!transport->set_path)
2613                 return -ENOSYS;
2614
2615         shost = scsi_host_lookup(ev->u.set_path.host_no);
2616         if (!shost) {
2617                 printk(KERN_ERR "set path could not find host no %u\n",
2618                        ev->u.set_path.host_no);
2619                 return -ENODEV;
2620         }
2621
2622         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2623         err = transport->set_path(shost, params);
2624
2625         scsi_host_put(shost);
2626         return err;
2627 }
2628
2629 static int
2630 iscsi_set_iface_params(struct iscsi_transport *transport,
2631                        struct iscsi_uevent *ev, uint32_t len)
2632 {
2633         char *data = (char *)ev + sizeof(*ev);
2634         struct Scsi_Host *shost;
2635         int err;
2636
2637         if (!transport->set_iface_param)
2638                 return -ENOSYS;
2639
2640         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2641         if (!shost) {
2642                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2643                        ev->u.set_iface_params.host_no);
2644                 return -ENODEV;
2645         }
2646
2647         err = transport->set_iface_param(shost, data, len);
2648         scsi_host_put(shost);
2649         return err;
2650 }
2651
2652 static int
2653 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2654 {
2655         struct Scsi_Host *shost;
2656         struct sockaddr *dst_addr;
2657         int err;
2658
2659         if (!transport->send_ping)
2660                 return -ENOSYS;
2661
2662         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2663         if (!shost) {
2664                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
2665                        ev->u.iscsi_ping.host_no);
2666                 return -ENODEV;
2667         }
2668
2669         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
2670         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
2671                                    ev->u.iscsi_ping.iface_type,
2672                                    ev->u.iscsi_ping.payload_size,
2673                                    ev->u.iscsi_ping.pid,
2674                                    dst_addr);
2675         scsi_host_put(shost);
2676         return err;
2677 }
2678
2679 static int
2680 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2681 {
2682         struct iscsi_uevent *ev = nlmsg_data(nlh);
2683         struct Scsi_Host *shost = NULL;
2684         struct iscsi_chap_rec *chap_rec;
2685         struct iscsi_internal *priv;
2686         struct sk_buff *skbchap;
2687         struct nlmsghdr *nlhchap;
2688         struct iscsi_uevent *evchap;
2689         uint32_t chap_buf_size;
2690         int len, err = 0;
2691         char *buf;
2692
2693         if (!transport->get_chap)
2694                 return -EINVAL;
2695
2696         priv = iscsi_if_transport_lookup(transport);
2697         if (!priv)
2698                 return -EINVAL;
2699
2700         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
2701         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
2702
2703         shost = scsi_host_lookup(ev->u.get_chap.host_no);
2704         if (!shost) {
2705                 printk(KERN_ERR "%s: failed. Cound not find host no %u\n",
2706                        __func__, ev->u.get_chap.host_no);
2707                 return -ENODEV;
2708         }
2709
2710         do {
2711                 int actual_size;
2712
2713                 skbchap = alloc_skb(len, GFP_KERNEL);
2714                 if (!skbchap) {
2715                         printk(KERN_ERR "can not deliver chap: OOM\n");
2716                         err = -ENOMEM;
2717                         goto exit_get_chap;
2718                 }
2719
2720                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
2721                                       (len - sizeof(*nlhchap)), 0);
2722                 evchap = nlmsg_data(nlhchap);
2723                 memset(evchap, 0, sizeof(*evchap));
2724                 evchap->transport_handle = iscsi_handle(transport);
2725                 evchap->type = nlh->nlmsg_type;
2726                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
2727                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
2728                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
2729                 buf = (char *) ((char *)evchap + sizeof(*evchap));
2730                 memset(buf, 0, chap_buf_size);
2731
2732                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
2733                                     &evchap->u.get_chap.num_entries, buf);
2734
2735                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
2736                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
2737                 nlhchap->nlmsg_len = actual_size;
2738
2739                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
2740                                           GFP_KERNEL);
2741         } while (err < 0 && err != -ECONNREFUSED);
2742
2743 exit_get_chap:
2744         scsi_host_put(shost);
2745         return err;
2746 }
2747
2748 static int iscsi_delete_chap(struct iscsi_transport *transport,
2749                              struct iscsi_uevent *ev)
2750 {
2751         struct Scsi_Host *shost;
2752         int err = 0;
2753
2754         if (!transport->delete_chap)
2755                 return -ENOSYS;
2756
2757         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
2758         if (!shost) {
2759                 printk(KERN_ERR "%s could not find host no %u\n",
2760                        __func__, ev->u.delete_chap.host_no);
2761                 return -ENODEV;
2762         }
2763
2764         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
2765         scsi_host_put(shost);
2766         return err;
2767 }
2768
2769 static const struct {
2770         enum iscsi_discovery_parent_type value;
2771         char                            *name;
2772 } iscsi_discovery_parent_names[] = {
2773         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
2774         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
2775         {ISCSI_DISC_PARENT_ISNS,        "isns" },
2776 };
2777
2778 char *iscsi_get_discovery_parent_name(int parent_type)
2779 {
2780         int i;
2781         char *state = "Unknown!";
2782
2783         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
2784                 if (iscsi_discovery_parent_names[i].value & parent_type) {
2785                         state = iscsi_discovery_parent_names[i].name;
2786                         break;
2787                 }
2788         }
2789         return state;
2790 }
2791 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
2792
2793 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
2794                                      struct iscsi_uevent *ev, uint32_t len)
2795 {
2796         char *data = (char *)ev + sizeof(*ev);
2797         struct Scsi_Host *shost;
2798         struct iscsi_bus_flash_session *fnode_sess;
2799         struct iscsi_bus_flash_conn *fnode_conn;
2800         struct device *dev;
2801         uint32_t idx;
2802         int err = 0;
2803
2804         if (!transport->set_flashnode_param) {
2805                 err = -ENOSYS;
2806                 goto exit_set_fnode;
2807         }
2808
2809         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
2810         if (!shost) {
2811                 pr_err("%s could not find host no %u\n",
2812                        __func__, ev->u.set_flashnode.host_no);
2813                 err = -ENODEV;
2814                 goto put_host;
2815         }
2816
2817         idx = ev->u.set_flashnode.flashnode_idx;
2818         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
2819         if (!fnode_sess) {
2820                 pr_err("%s could not find flashnode %u for host no %u\n",
2821                        __func__, idx, ev->u.set_flashnode.host_no);
2822                 err = -ENODEV;
2823                 goto put_host;
2824         }
2825
2826         dev = iscsi_find_flashnode_conn(fnode_sess);
2827         if (!dev) {
2828                 err = -ENODEV;
2829                 goto put_sess;
2830         }
2831
2832         fnode_conn = iscsi_dev_to_flash_conn(dev);
2833         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
2834         put_device(dev);
2835
2836 put_sess:
2837         put_device(&fnode_sess->dev);
2838
2839 put_host:
2840         scsi_host_put(shost);
2841
2842 exit_set_fnode:
2843         return err;
2844 }
2845
2846 static int iscsi_new_flashnode(struct iscsi_transport *transport,
2847                                struct iscsi_uevent *ev, uint32_t len)
2848 {
2849         char *data = (char *)ev + sizeof(*ev);
2850         struct Scsi_Host *shost;
2851         int index;
2852         int err = 0;
2853
2854         if (!transport->new_flashnode) {
2855                 err = -ENOSYS;
2856                 goto exit_new_fnode;
2857         }
2858
2859         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
2860         if (!shost) {
2861                 pr_err("%s could not find host no %u\n",
2862                        __func__, ev->u.new_flashnode.host_no);
2863                 err = -ENODEV;
2864                 goto put_host;
2865         }
2866
2867         index = transport->new_flashnode(shost, data, len);
2868
2869         if (index >= 0)
2870                 ev->r.new_flashnode_ret.flashnode_idx = index;
2871         else
2872                 err = -EIO;
2873
2874 put_host:
2875         scsi_host_put(shost);
2876
2877 exit_new_fnode:
2878         return err;
2879 }
2880
2881 static int iscsi_del_flashnode(struct iscsi_transport *transport,
2882                                struct iscsi_uevent *ev)
2883 {
2884         struct Scsi_Host *shost;
2885         struct iscsi_bus_flash_session *fnode_sess;
2886         uint32_t idx;
2887         int err = 0;
2888
2889         if (!transport->del_flashnode) {
2890                 err = -ENOSYS;
2891                 goto exit_del_fnode;
2892         }
2893
2894         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
2895         if (!shost) {
2896                 pr_err("%s could not find host no %u\n",
2897                        __func__, ev->u.del_flashnode.host_no);
2898                 err = -ENODEV;
2899                 goto put_host;
2900         }
2901
2902         idx = ev->u.del_flashnode.flashnode_idx;
2903         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
2904         if (!fnode_sess) {
2905                 pr_err("%s could not find flashnode %u for host no %u\n",
2906                        __func__, idx, ev->u.del_flashnode.host_no);
2907                 err = -ENODEV;
2908                 goto put_host;
2909         }
2910
2911         err = transport->del_flashnode(fnode_sess);
2912         put_device(&fnode_sess->dev);
2913
2914 put_host:
2915         scsi_host_put(shost);
2916
2917 exit_del_fnode:
2918         return err;
2919 }
2920
2921 static int iscsi_login_flashnode(struct iscsi_transport *transport,
2922                                  struct iscsi_uevent *ev)
2923 {
2924         struct Scsi_Host *shost;
2925         struct iscsi_bus_flash_session *fnode_sess;
2926         struct iscsi_bus_flash_conn *fnode_conn;
2927         struct device *dev;
2928         uint32_t idx;
2929         int err = 0;
2930
2931         if (!transport->login_flashnode) {
2932                 err = -ENOSYS;
2933                 goto exit_login_fnode;
2934         }
2935
2936         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
2937         if (!shost) {
2938                 pr_err("%s could not find host no %u\n",
2939                        __func__, ev->u.login_flashnode.host_no);
2940                 err = -ENODEV;
2941                 goto put_host;
2942         }
2943
2944         idx = ev->u.login_flashnode.flashnode_idx;
2945         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
2946         if (!fnode_sess) {
2947                 pr_err("%s could not find flashnode %u for host no %u\n",
2948                        __func__, idx, ev->u.login_flashnode.host_no);
2949                 err = -ENODEV;
2950                 goto put_host;
2951         }
2952
2953         dev = iscsi_find_flashnode_conn(fnode_sess);
2954         if (!dev) {
2955                 err = -ENODEV;
2956                 goto put_sess;
2957         }
2958
2959         fnode_conn = iscsi_dev_to_flash_conn(dev);
2960         err = transport->login_flashnode(fnode_sess, fnode_conn);
2961         put_device(dev);
2962
2963 put_sess:
2964         put_device(&fnode_sess->dev);
2965
2966 put_host:
2967         scsi_host_put(shost);
2968
2969 exit_login_fnode:
2970         return err;
2971 }
2972
2973 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
2974                                   struct iscsi_uevent *ev)
2975 {
2976         struct Scsi_Host *shost;
2977         struct iscsi_bus_flash_session *fnode_sess;
2978         struct iscsi_bus_flash_conn *fnode_conn;
2979         struct device *dev;
2980         uint32_t idx;
2981         int err = 0;
2982
2983         if (!transport->logout_flashnode) {
2984                 err = -ENOSYS;
2985                 goto exit_logout_fnode;
2986         }
2987
2988         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
2989         if (!shost) {
2990                 pr_err("%s could not find host no %u\n",
2991                        __func__, ev->u.logout_flashnode.host_no);
2992                 err = -ENODEV;
2993                 goto put_host;
2994         }
2995
2996         idx = ev->u.logout_flashnode.flashnode_idx;
2997         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
2998         if (!fnode_sess) {
2999                 pr_err("%s could not find flashnode %u for host no %u\n",
3000                        __func__, idx, ev->u.logout_flashnode.host_no);
3001                 err = -ENODEV;
3002                 goto put_host;
3003         }
3004
3005         dev = iscsi_find_flashnode_conn(fnode_sess);
3006         if (!dev) {
3007                 err = -ENODEV;
3008                 goto put_sess;
3009         }
3010
3011         fnode_conn = iscsi_dev_to_flash_conn(dev);
3012
3013         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3014         put_device(dev);
3015
3016 put_sess:
3017         put_device(&fnode_sess->dev);
3018
3019 put_host:
3020         scsi_host_put(shost);
3021
3022 exit_logout_fnode:
3023         return err;
3024 }
3025
3026 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3027                                       struct iscsi_uevent *ev)
3028 {
3029         struct Scsi_Host *shost;
3030         struct iscsi_cls_session *session;
3031         int err = 0;
3032
3033         if (!transport->logout_flashnode_sid) {
3034                 err = -ENOSYS;
3035                 goto exit_logout_sid;
3036         }
3037
3038         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3039         if (!shost) {
3040                 pr_err("%s could not find host no %u\n",
3041                        __func__, ev->u.logout_flashnode.host_no);
3042                 err = -ENODEV;
3043                 goto put_host;
3044         }
3045
3046         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3047         if (!session) {
3048                 pr_err("%s could not find session id %u\n",
3049                        __func__, ev->u.logout_flashnode_sid.sid);
3050                 err = -EINVAL;
3051                 goto put_host;
3052         }
3053
3054         err = transport->logout_flashnode_sid(session);
3055
3056 put_host:
3057         scsi_host_put(shost);
3058
3059 exit_logout_sid:
3060         return err;
3061 }
3062
3063 static int
3064 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3065 {
3066         int err = 0;
3067         struct iscsi_uevent *ev = nlmsg_data(nlh);
3068         struct iscsi_transport *transport = NULL;
3069         struct iscsi_internal *priv;
3070         struct iscsi_cls_session *session;
3071         struct iscsi_cls_conn *conn;
3072         struct iscsi_endpoint *ep = NULL;
3073
3074         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3075                 *group = ISCSI_NL_GRP_UIP;
3076         else
3077                 *group = ISCSI_NL_GRP_ISCSID;
3078
3079         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3080         if (!priv)
3081                 return -EINVAL;
3082         transport = priv->iscsi_transport;
3083
3084         if (!try_module_get(transport->owner))
3085                 return -EINVAL;
3086
3087         switch (nlh->nlmsg_type) {
3088         case ISCSI_UEVENT_CREATE_SESSION:
3089                 err = iscsi_if_create_session(priv, ep, ev,
3090                                               NETLINK_CB(skb).portid,
3091                                               ev->u.c_session.initial_cmdsn,
3092                                               ev->u.c_session.cmds_max,
3093                                               ev->u.c_session.queue_depth);
3094                 break;
3095         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3096                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3097                 if (!ep) {
3098                         err = -EINVAL;
3099                         break;
3100                 }
3101
3102                 err = iscsi_if_create_session(priv, ep, ev,
3103                                         NETLINK_CB(skb).portid,
3104                                         ev->u.c_bound_session.initial_cmdsn,
3105                                         ev->u.c_bound_session.cmds_max,
3106                                         ev->u.c_bound_session.queue_depth);
3107                 break;
3108         case ISCSI_UEVENT_DESTROY_SESSION:
3109                 session = iscsi_session_lookup(ev->u.d_session.sid);
3110                 if (session)
3111                         transport->destroy_session(session);
3112                 else
3113                         err = -EINVAL;
3114                 break;
3115         case ISCSI_UEVENT_UNBIND_SESSION:
3116                 session = iscsi_session_lookup(ev->u.d_session.sid);
3117                 if (session)
3118                         scsi_queue_work(iscsi_session_to_shost(session),
3119                                         &session->unbind_work);
3120                 else
3121                         err = -EINVAL;
3122                 break;
3123         case ISCSI_UEVENT_CREATE_CONN:
3124                 err = iscsi_if_create_conn(transport, ev);
3125                 break;
3126         case ISCSI_UEVENT_DESTROY_CONN:
3127                 err = iscsi_if_destroy_conn(transport, ev);
3128                 break;
3129         case ISCSI_UEVENT_BIND_CONN:
3130                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3131                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3132
3133                 if (conn && conn->ep)
3134                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3135
3136                 if (!session || !conn) {
3137                         err = -EINVAL;
3138                         break;
3139                 }
3140
3141                 ev->r.retcode = transport->bind_conn(session, conn,
3142                                                 ev->u.b_conn.transport_eph,
3143                                                 ev->u.b_conn.is_leading);
3144                 if (ev->r.retcode || !transport->ep_connect)
3145                         break;
3146
3147                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3148                 if (ep) {
3149                         ep->conn = conn;
3150
3151                         mutex_lock(&conn->ep_mutex);
3152                         conn->ep = ep;
3153                         mutex_unlock(&conn->ep_mutex);
3154                 } else
3155                         iscsi_cls_conn_printk(KERN_ERR, conn,
3156                                               "Could not set ep conn "
3157                                               "binding\n");
3158                 break;
3159         case ISCSI_UEVENT_SET_PARAM:
3160                 err = iscsi_set_param(transport, ev);
3161                 break;
3162         case ISCSI_UEVENT_START_CONN:
3163                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3164                 if (conn)
3165                         ev->r.retcode = transport->start_conn(conn);
3166                 else
3167                         err = -EINVAL;
3168                 break;
3169         case ISCSI_UEVENT_STOP_CONN:
3170                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3171                 if (conn)
3172                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3173                 else
3174                         err = -EINVAL;
3175                 break;
3176         case ISCSI_UEVENT_SEND_PDU:
3177                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3178                 if (conn)
3179                         ev->r.retcode = transport->send_pdu(conn,
3180                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3181                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3182                                 ev->u.send_pdu.data_size);
3183                 else
3184                         err = -EINVAL;
3185                 break;
3186         case ISCSI_UEVENT_GET_STATS:
3187                 err = iscsi_if_get_stats(transport, nlh);
3188                 break;
3189         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3190         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3191         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3192         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3193                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3194                 break;
3195         case ISCSI_UEVENT_TGT_DSCVR:
3196                 err = iscsi_tgt_dscvr(transport, ev);
3197                 break;
3198         case ISCSI_UEVENT_SET_HOST_PARAM:
3199                 err = iscsi_set_host_param(transport, ev);
3200                 break;
3201         case ISCSI_UEVENT_PATH_UPDATE:
3202                 err = iscsi_set_path(transport, ev);
3203                 break;
3204         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3205                 err = iscsi_set_iface_params(transport, ev,
3206                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3207                 break;
3208         case ISCSI_UEVENT_PING:
3209                 err = iscsi_send_ping(transport, ev);
3210                 break;
3211         case ISCSI_UEVENT_GET_CHAP:
3212                 err = iscsi_get_chap(transport, nlh);
3213                 break;
3214         case ISCSI_UEVENT_DELETE_CHAP:
3215                 err = iscsi_delete_chap(transport, ev);
3216                 break;
3217         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3218                 err = iscsi_set_flashnode_param(transport, ev,
3219                                                 nlmsg_attrlen(nlh,
3220                                                               sizeof(*ev)));
3221                 break;
3222         case ISCSI_UEVENT_NEW_FLASHNODE:
3223                 err = iscsi_new_flashnode(transport, ev,
3224                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3225                 break;
3226         case ISCSI_UEVENT_DEL_FLASHNODE:
3227                 err = iscsi_del_flashnode(transport, ev);
3228                 break;
3229         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3230                 err = iscsi_login_flashnode(transport, ev);
3231                 break;
3232         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3233                 err = iscsi_logout_flashnode(transport, ev);
3234                 break;
3235         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3236                 err = iscsi_logout_flashnode_sid(transport, ev);
3237                 break;
3238         default:
3239                 err = -ENOSYS;
3240                 break;
3241         }
3242
3243         module_put(transport->owner);
3244         return err;
3245 }
3246
3247 /*
3248  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3249  * Malformed skbs with wrong lengths or invalid creds are not processed.
3250  */
3251 static void
3252 iscsi_if_rx(struct sk_buff *skb)
3253 {
3254         mutex_lock(&rx_queue_mutex);
3255         while (skb->len >= NLMSG_HDRLEN) {
3256                 int err;
3257                 uint32_t rlen;
3258                 struct nlmsghdr *nlh;
3259                 struct iscsi_uevent *ev;
3260                 uint32_t group;
3261
3262                 nlh = nlmsg_hdr(skb);
3263                 if (nlh->nlmsg_len < sizeof(*nlh) ||
3264                     skb->len < nlh->nlmsg_len) {
3265                         break;
3266                 }
3267
3268                 ev = nlmsg_data(nlh);
3269                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3270                 if (rlen > skb->len)
3271                         rlen = skb->len;
3272
3273                 err = iscsi_if_recv_msg(skb, nlh, &group);
3274                 if (err) {
3275                         ev->type = ISCSI_KEVENT_IF_ERROR;
3276                         ev->iferror = err;
3277                 }
3278                 do {
3279                         /*
3280                          * special case for GET_STATS:
3281                          * on success - sending reply and stats from
3282                          * inside of if_recv_msg(),
3283                          * on error - fall through.
3284                          */
3285                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3286                                 break;
3287                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3288                                 break;
3289                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
3290                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
3291                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3292                 skb_pull(skb, rlen);
3293         }
3294         mutex_unlock(&rx_queue_mutex);
3295 }
3296
3297 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3298 struct device_attribute dev_attr_##_prefix##_##_name =  \
3299         __ATTR(_name,_mode,_show,_store)
3300
3301 /*
3302  * iSCSI connection attrs
3303  */
3304 #define iscsi_conn_attr_show(param)                                     \
3305 static ssize_t                                                          \
3306 show_conn_param_##param(struct device *dev,                             \
3307                         struct device_attribute *attr, char *buf)       \
3308 {                                                                       \
3309         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3310         struct iscsi_transport *t = conn->transport;                    \
3311         return t->get_conn_param(conn, param, buf);                     \
3312 }
3313
3314 #define iscsi_conn_attr(field, param)                                   \
3315         iscsi_conn_attr_show(param)                                     \
3316 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3317                         NULL);
3318
3319 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3320 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3321 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3322 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3323 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3324 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3325 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3326 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3327 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3328 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3329 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3330
3331 #define iscsi_conn_ep_attr_show(param)                                  \
3332 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3333                                           struct device_attribute *attr,\
3334                                           char *buf)                    \
3335 {                                                                       \
3336         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3337         struct iscsi_transport *t = conn->transport;                    \
3338         struct iscsi_endpoint *ep;                                      \
3339         ssize_t rc;                                                     \
3340                                                                         \
3341         /*                                                              \
3342          * Need to make sure ep_disconnect does not free the LLD's      \
3343          * interconnect resources while we are trying to read them.     \
3344          */                                                             \
3345         mutex_lock(&conn->ep_mutex);                                    \
3346         ep = conn->ep;                                                  \
3347         if (!ep && t->ep_connect) {                                     \
3348                 mutex_unlock(&conn->ep_mutex);                          \
3349                 return -ENOTCONN;                                       \
3350         }                                                               \
3351                                                                         \
3352         if (ep)                                                         \
3353                 rc = t->get_ep_param(ep, param, buf);                   \
3354         else                                                            \
3355                 rc = t->get_conn_param(conn, param, buf);               \
3356         mutex_unlock(&conn->ep_mutex);                                  \
3357         return rc;                                                      \
3358 }
3359
3360 #define iscsi_conn_ep_attr(field, param)                                \
3361         iscsi_conn_ep_attr_show(param)                                  \
3362 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3363                         show_conn_ep_param_##param, NULL);
3364
3365 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3366 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3367
3368 static struct attribute *iscsi_conn_attrs[] = {
3369         &dev_attr_conn_max_recv_dlength.attr,
3370         &dev_attr_conn_max_xmit_dlength.attr,
3371         &dev_attr_conn_header_digest.attr,
3372         &dev_attr_conn_data_digest.attr,
3373         &dev_attr_conn_ifmarker.attr,
3374         &dev_attr_conn_ofmarker.attr,
3375         &dev_attr_conn_address.attr,
3376         &dev_attr_conn_port.attr,
3377         &dev_attr_conn_exp_statsn.attr,
3378         &dev_attr_conn_persistent_address.attr,
3379         &dev_attr_conn_persistent_port.attr,
3380         &dev_attr_conn_ping_tmo.attr,
3381         &dev_attr_conn_recv_tmo.attr,
3382         NULL,
3383 };
3384
3385 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3386                                          struct attribute *attr, int i)
3387 {
3388         struct device *cdev = container_of(kobj, struct device, kobj);
3389         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3390         struct iscsi_transport *t = conn->transport;
3391         int param;
3392
3393         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3394                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3395         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3396                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3397         else if (attr == &dev_attr_conn_header_digest.attr)
3398                 param = ISCSI_PARAM_HDRDGST_EN;
3399         else if (attr == &dev_attr_conn_data_digest.attr)
3400                 param = ISCSI_PARAM_DATADGST_EN;
3401         else if (attr == &dev_attr_conn_ifmarker.attr)
3402                 param = ISCSI_PARAM_IFMARKER_EN;
3403         else if (attr == &dev_attr_conn_ofmarker.attr)
3404                 param = ISCSI_PARAM_OFMARKER_EN;
3405         else if (attr == &dev_attr_conn_address.attr)
3406                 param = ISCSI_PARAM_CONN_ADDRESS;
3407         else if (attr == &dev_attr_conn_port.attr)
3408                 param = ISCSI_PARAM_CONN_PORT;
3409         else if (attr == &dev_attr_conn_exp_statsn.attr)
3410                 param = ISCSI_PARAM_EXP_STATSN;
3411         else if (attr == &dev_attr_conn_persistent_address.attr)
3412                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3413         else if (attr == &dev_attr_conn_persistent_port.attr)
3414                 param = ISCSI_PARAM_PERSISTENT_PORT;
3415         else if (attr == &dev_attr_conn_ping_tmo.attr)
3416                 param = ISCSI_PARAM_PING_TMO;
3417         else if (attr == &dev_attr_conn_recv_tmo.attr)
3418                 param = ISCSI_PARAM_RECV_TMO;
3419         else {
3420                 WARN_ONCE(1, "Invalid conn attr");
3421                 return 0;
3422         }
3423
3424         return t->attr_is_visible(ISCSI_PARAM, param);
3425 }
3426
3427 static struct attribute_group iscsi_conn_group = {
3428         .attrs = iscsi_conn_attrs,
3429         .is_visible = iscsi_conn_attr_is_visible,
3430 };
3431
3432 /*
3433  * iSCSI session attrs
3434  */
3435 #define iscsi_session_attr_show(param, perm)                            \
3436 static ssize_t                                                          \
3437 show_session_param_##param(struct device *dev,                          \
3438                            struct device_attribute *attr, char *buf)    \
3439 {                                                                       \
3440         struct iscsi_cls_session *session =                             \
3441                 iscsi_dev_to_session(dev->parent);                      \
3442         struct iscsi_transport *t = session->transport;                 \
3443                                                                         \
3444         if (perm && !capable(CAP_SYS_ADMIN))                            \
3445                 return -EACCES;                                         \
3446         return t->get_session_param(session, param, buf);               \
3447 }
3448
3449 #define iscsi_session_attr(field, param, perm)                          \
3450         iscsi_session_attr_show(param, perm)                            \
3451 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3452                         NULL);
3453 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3454 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3455 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3456 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3457 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3458 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3459 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3460 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3461 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3462 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3463 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3464 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3465 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3466 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3467 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3468 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3469 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3470 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3471 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3472 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3473 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3474 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3475 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3476
3477 static ssize_t
3478 show_priv_session_state(struct device *dev, struct device_attribute *attr,
3479                         char *buf)
3480 {
3481         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3482         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
3483 }
3484 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
3485                         NULL);
3486 static ssize_t
3487 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
3488                         char *buf)
3489 {
3490         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3491         return sprintf(buf, "%d\n", session->creator);
3492 }
3493 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
3494                         NULL);
3495 static ssize_t
3496 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
3497                             char *buf)
3498 {
3499         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3500         return sprintf(buf, "%d\n", session->target_id);
3501 }
3502 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
3503                         show_priv_session_target_id, NULL);
3504
3505 #define iscsi_priv_session_attr_show(field, format)                     \
3506 static ssize_t                                                          \
3507 show_priv_session_##field(struct device *dev,                           \
3508                           struct device_attribute *attr, char *buf)     \
3509 {                                                                       \
3510         struct iscsi_cls_session *session =                             \
3511                         iscsi_dev_to_session(dev->parent);              \
3512         if (session->field == -1)                                       \
3513                 return sprintf(buf, "off\n");                           \
3514         return sprintf(buf, format"\n", session->field);                \
3515 }
3516
3517 #define iscsi_priv_session_attr_store(field)                            \
3518 static ssize_t                                                          \
3519 store_priv_session_##field(struct device *dev,                          \
3520                            struct device_attribute *attr,               \
3521                            const char *buf, size_t count)               \
3522 {                                                                       \
3523         int val;                                                        \
3524         char *cp;                                                       \
3525         struct iscsi_cls_session *session =                             \
3526                 iscsi_dev_to_session(dev->parent);                      \
3527         if ((session->state == ISCSI_SESSION_FREE) ||                   \
3528             (session->state == ISCSI_SESSION_FAILED))                   \
3529                 return -EBUSY;                                          \
3530         if (strncmp(buf, "off", 3) == 0)                                \
3531                 session->field = -1;                                    \
3532         else {                                                          \
3533                 val = simple_strtoul(buf, &cp, 0);                      \
3534                 if (*cp != '\0' && *cp != '\n')                         \
3535                         return -EINVAL;                                 \
3536                 session->field = val;                                   \
3537         }                                                               \
3538         return count;                                                   \
3539 }
3540
3541 #define iscsi_priv_session_rw_attr(field, format)                       \
3542         iscsi_priv_session_attr_show(field, format)                     \
3543         iscsi_priv_session_attr_store(field)                            \
3544 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
3545                         show_priv_session_##field,                      \
3546                         store_priv_session_##field)
3547 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
3548
3549 static struct attribute *iscsi_session_attrs[] = {
3550         &dev_attr_sess_initial_r2t.attr,
3551         &dev_attr_sess_max_outstanding_r2t.attr,
3552         &dev_attr_sess_immediate_data.attr,
3553         &dev_attr_sess_first_burst_len.attr,
3554         &dev_attr_sess_max_burst_len.attr,
3555         &dev_attr_sess_data_pdu_in_order.attr,
3556         &dev_attr_sess_data_seq_in_order.attr,
3557         &dev_attr_sess_erl.attr,
3558         &dev_attr_sess_targetname.attr,
3559         &dev_attr_sess_tpgt.attr,
3560         &dev_attr_sess_password.attr,
3561         &dev_attr_sess_password_in.attr,
3562         &dev_attr_sess_username.attr,
3563         &dev_attr_sess_username_in.attr,
3564         &dev_attr_sess_fast_abort.attr,
3565         &dev_attr_sess_abort_tmo.attr,
3566         &dev_attr_sess_lu_reset_tmo.attr,
3567         &dev_attr_sess_tgt_reset_tmo.attr,
3568         &dev_attr_sess_ifacename.attr,
3569         &dev_attr_sess_initiatorname.attr,
3570         &dev_attr_sess_targetalias.attr,
3571         &dev_attr_priv_sess_recovery_tmo.attr,
3572         &dev_attr_priv_sess_state.attr,
3573         &dev_attr_priv_sess_creator.attr,
3574         &dev_attr_sess_chap_out_idx.attr,
3575         &dev_attr_sess_chap_in_idx.attr,
3576         &dev_attr_priv_sess_target_id.attr,
3577         NULL,
3578 };
3579
3580 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
3581                                             struct attribute *attr, int i)
3582 {
3583         struct device *cdev = container_of(kobj, struct device, kobj);
3584         struct iscsi_cls_session *session = transport_class_to_session(cdev);
3585         struct iscsi_transport *t = session->transport;
3586         int param;
3587
3588         if (attr == &dev_attr_sess_initial_r2t.attr)
3589                 param = ISCSI_PARAM_INITIAL_R2T_EN;
3590         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
3591                 param = ISCSI_PARAM_MAX_R2T;
3592         else if (attr == &dev_attr_sess_immediate_data.attr)
3593                 param = ISCSI_PARAM_IMM_DATA_EN;
3594         else if (attr == &dev_attr_sess_first_burst_len.attr)
3595                 param = ISCSI_PARAM_FIRST_BURST;
3596         else if (attr == &dev_attr_sess_max_burst_len.attr)
3597                 param = ISCSI_PARAM_MAX_BURST;
3598         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
3599                 param = ISCSI_PARAM_PDU_INORDER_EN;
3600         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
3601                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
3602         else if (attr == &dev_attr_sess_erl.attr)
3603                 param = ISCSI_PARAM_ERL;
3604         else if (attr == &dev_attr_sess_targetname.attr)
3605                 param = ISCSI_PARAM_TARGET_NAME;
3606         else if (attr == &dev_attr_sess_tpgt.attr)
3607                 param = ISCSI_PARAM_TPGT;
3608         else if (attr == &dev_attr_sess_chap_in_idx.attr)
3609                 param = ISCSI_PARAM_CHAP_IN_IDX;
3610         else if (attr == &dev_attr_sess_chap_out_idx.attr)
3611                 param = ISCSI_PARAM_CHAP_OUT_IDX;
3612         else if (attr == &dev_attr_sess_password.attr)
3613                 param = ISCSI_PARAM_USERNAME;
3614         else if (attr == &dev_attr_sess_password_in.attr)
3615                 param = ISCSI_PARAM_USERNAME_IN;
3616         else if (attr == &dev_attr_sess_username.attr)
3617                 param = ISCSI_PARAM_PASSWORD;
3618         else if (attr == &dev_attr_sess_username_in.attr)
3619                 param = ISCSI_PARAM_PASSWORD_IN;
3620         else if (attr == &dev_attr_sess_fast_abort.attr)
3621                 param = ISCSI_PARAM_FAST_ABORT;
3622         else if (attr == &dev_attr_sess_abort_tmo.attr)
3623                 param = ISCSI_PARAM_ABORT_TMO;
3624         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
3625                 param = ISCSI_PARAM_LU_RESET_TMO;
3626         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
3627                 param = ISCSI_PARAM_TGT_RESET_TMO;
3628         else if (attr == &dev_attr_sess_ifacename.attr)
3629                 param = ISCSI_PARAM_IFACE_NAME;
3630         else if (attr == &dev_attr_sess_initiatorname.attr)
3631                 param = ISCSI_PARAM_INITIATOR_NAME;
3632         else if (attr == &dev_attr_sess_targetalias.attr)
3633                 param = ISCSI_PARAM_TARGET_ALIAS;
3634         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
3635                 return S_IRUGO | S_IWUSR;
3636         else if (attr == &dev_attr_priv_sess_state.attr)
3637                 return S_IRUGO;
3638         else if (attr == &dev_attr_priv_sess_creator.attr)
3639                 return S_IRUGO;
3640         else if (attr == &dev_attr_priv_sess_target_id.attr)
3641                 return S_IRUGO;
3642         else {
3643                 WARN_ONCE(1, "Invalid session attr");
3644                 return 0;
3645         }
3646
3647         return t->attr_is_visible(ISCSI_PARAM, param);
3648 }
3649
3650 static struct attribute_group iscsi_session_group = {
3651         .attrs = iscsi_session_attrs,
3652         .is_visible = iscsi_session_attr_is_visible,
3653 };
3654
3655 /*
3656  * iSCSI host attrs
3657  */
3658 #define iscsi_host_attr_show(param)                                     \
3659 static ssize_t                                                          \
3660 show_host_param_##param(struct device *dev,                             \
3661                         struct device_attribute *attr, char *buf)       \
3662 {                                                                       \
3663         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
3664         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
3665         return priv->iscsi_transport->get_host_param(shost, param, buf); \
3666 }
3667
3668 #define iscsi_host_attr(field, param)                                   \
3669         iscsi_host_attr_show(param)                                     \
3670 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
3671                         NULL);
3672
3673 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
3674 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
3675 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
3676 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
3677 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
3678 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
3679
3680 static struct attribute *iscsi_host_attrs[] = {
3681         &dev_attr_host_netdev.attr,
3682         &dev_attr_host_hwaddress.attr,
3683         &dev_attr_host_ipaddress.attr,
3684         &dev_attr_host_initiatorname.attr,
3685         &dev_attr_host_port_state.attr,
3686         &dev_attr_host_port_speed.attr,
3687         NULL,
3688 };
3689
3690 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
3691                                          struct attribute *attr, int i)
3692 {
3693         struct device *cdev = container_of(kobj, struct device, kobj);
3694         struct Scsi_Host *shost = transport_class_to_shost(cdev);
3695         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
3696         int param;
3697
3698         if (attr == &dev_attr_host_netdev.attr)
3699                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
3700         else if (attr == &dev_attr_host_hwaddress.attr)
3701                 param = ISCSI_HOST_PARAM_HWADDRESS;
3702         else if (attr == &dev_attr_host_ipaddress.attr)
3703                 param = ISCSI_HOST_PARAM_IPADDRESS;
3704         else if (attr == &dev_attr_host_initiatorname.attr)
3705                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
3706         else if (attr == &dev_attr_host_port_state.attr)
3707                 param = ISCSI_HOST_PARAM_PORT_STATE;
3708         else if (attr == &dev_attr_host_port_speed.attr)
3709                 param = ISCSI_HOST_PARAM_PORT_SPEED;
3710         else {
3711                 WARN_ONCE(1, "Invalid host attr");
3712                 return 0;
3713         }
3714
3715         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
3716 }
3717
3718 static struct attribute_group iscsi_host_group = {
3719         .attrs = iscsi_host_attrs,
3720         .is_visible = iscsi_host_attr_is_visible,
3721 };
3722
3723 /* convert iscsi_port_speed values to ascii string name */
3724 static const struct {
3725         enum iscsi_port_speed   value;
3726         char                    *name;
3727 } iscsi_port_speed_names[] = {
3728         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
3729         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
3730         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
3731         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
3732         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
3733 };
3734
3735 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
3736 {
3737         int i;
3738         char *speed = "Unknown!";
3739         struct iscsi_cls_host *ihost = shost->shost_data;
3740         uint32_t port_speed = ihost->port_speed;
3741
3742         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
3743                 if (iscsi_port_speed_names[i].value & port_speed) {
3744                         speed = iscsi_port_speed_names[i].name;
3745                         break;
3746                 }
3747         }
3748         return speed;
3749 }
3750 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
3751
3752 /* convert iscsi_port_state values to ascii string name */
3753 static const struct {
3754         enum iscsi_port_state   value;
3755         char                    *name;
3756 } iscsi_port_state_names[] = {
3757         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
3758         {ISCSI_PORT_STATE_UP,           "LINK UP" },
3759 };
3760
3761 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
3762 {
3763         int i;
3764         char *state = "Unknown!";
3765         struct iscsi_cls_host *ihost = shost->shost_data;
3766         uint32_t port_state = ihost->port_state;
3767
3768         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
3769                 if (iscsi_port_state_names[i].value & port_state) {
3770                         state = iscsi_port_state_names[i].name;
3771                         break;
3772                 }
3773         }
3774         return state;
3775 }
3776 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
3777
3778 static int iscsi_session_match(struct attribute_container *cont,
3779                            struct device *dev)
3780 {
3781         struct iscsi_cls_session *session;
3782         struct Scsi_Host *shost;
3783         struct iscsi_internal *priv;
3784
3785         if (!iscsi_is_session_dev(dev))
3786                 return 0;
3787
3788         session = iscsi_dev_to_session(dev);
3789         shost = iscsi_session_to_shost(session);
3790         if (!shost->transportt)
3791                 return 0;
3792
3793         priv = to_iscsi_internal(shost->transportt);
3794         if (priv->session_cont.ac.class != &iscsi_session_class.class)
3795                 return 0;
3796
3797         return &priv->session_cont.ac == cont;
3798 }
3799
3800 static int iscsi_conn_match(struct attribute_container *cont,
3801                            struct device *dev)
3802 {
3803         struct iscsi_cls_session *session;
3804         struct iscsi_cls_conn *conn;
3805         struct Scsi_Host *shost;
3806         struct iscsi_internal *priv;
3807
3808         if (!iscsi_is_conn_dev(dev))
3809                 return 0;
3810
3811         conn = iscsi_dev_to_conn(dev);
3812         session = iscsi_dev_to_session(conn->dev.parent);
3813         shost = iscsi_session_to_shost(session);
3814
3815         if (!shost->transportt)
3816                 return 0;
3817
3818         priv = to_iscsi_internal(shost->transportt);
3819         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
3820                 return 0;
3821
3822         return &priv->conn_cont.ac == cont;
3823 }
3824
3825 static int iscsi_host_match(struct attribute_container *cont,
3826                             struct device *dev)
3827 {
3828         struct Scsi_Host *shost;
3829         struct iscsi_internal *priv;
3830
3831         if (!scsi_is_host_device(dev))
3832                 return 0;
3833
3834         shost = dev_to_shost(dev);
3835         if (!shost->transportt  ||
3836             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
3837                 return 0;
3838
3839         priv = to_iscsi_internal(shost->transportt);
3840         return &priv->t.host_attrs.ac == cont;
3841 }
3842
3843 struct scsi_transport_template *
3844 iscsi_register_transport(struct iscsi_transport *tt)
3845 {
3846         struct iscsi_internal *priv;
3847         unsigned long flags;
3848         int err;
3849
3850         BUG_ON(!tt);
3851
3852         priv = iscsi_if_transport_lookup(tt);
3853         if (priv)
3854                 return NULL;
3855
3856         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
3857         if (!priv)
3858                 return NULL;
3859         INIT_LIST_HEAD(&priv->list);
3860         priv->iscsi_transport = tt;
3861         priv->t.user_scan = iscsi_user_scan;
3862         priv->t.create_work_queue = 1;
3863
3864         priv->dev.class = &iscsi_transport_class;
3865         dev_set_name(&priv->dev, "%s", tt->name);
3866         err = device_register(&priv->dev);
3867         if (err)
3868                 goto free_priv;
3869
3870         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
3871         if (err)
3872                 goto unregister_dev;
3873
3874         /* host parameters */
3875         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
3876         priv->t.host_attrs.ac.match = iscsi_host_match;
3877         priv->t.host_attrs.ac.grp = &iscsi_host_group;
3878         priv->t.host_size = sizeof(struct iscsi_cls_host);
3879         transport_container_register(&priv->t.host_attrs);
3880
3881         /* connection parameters */
3882         priv->conn_cont.ac.class = &iscsi_connection_class.class;
3883         priv->conn_cont.ac.match = iscsi_conn_match;
3884         priv->conn_cont.ac.grp = &iscsi_conn_group;
3885         transport_container_register(&priv->conn_cont);
3886
3887         /* session parameters */
3888         priv->session_cont.ac.class = &iscsi_session_class.class;
3889         priv->session_cont.ac.match = iscsi_session_match;
3890         priv->session_cont.ac.grp = &iscsi_session_group;
3891         transport_container_register(&priv->session_cont);
3892
3893         spin_lock_irqsave(&iscsi_transport_lock, flags);
3894         list_add(&priv->list, &iscsi_transports);
3895         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
3896
3897         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
3898         return &priv->t;
3899
3900 unregister_dev:
3901         device_unregister(&priv->dev);
3902         return NULL;
3903 free_priv:
3904         kfree(priv);
3905         return NULL;
3906 }
3907 EXPORT_SYMBOL_GPL(iscsi_register_transport);
3908
3909 int iscsi_unregister_transport(struct iscsi_transport *tt)
3910 {
3911         struct iscsi_internal *priv;
3912         unsigned long flags;
3913
3914         BUG_ON(!tt);
3915
3916         mutex_lock(&rx_queue_mutex);
3917
3918         priv = iscsi_if_transport_lookup(tt);
3919         BUG_ON (!priv);
3920
3921         spin_lock_irqsave(&iscsi_transport_lock, flags);
3922         list_del(&priv->list);
3923         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
3924
3925         transport_container_unregister(&priv->conn_cont);
3926         transport_container_unregister(&priv->session_cont);
3927         transport_container_unregister(&priv->t.host_attrs);
3928
3929         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
3930         device_unregister(&priv->dev);
3931         mutex_unlock(&rx_queue_mutex);
3932
3933         return 0;
3934 }
3935 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
3936
3937 static __init int iscsi_transport_init(void)
3938 {
3939         int err;
3940         struct netlink_kernel_cfg cfg = {
3941                 .groups = 1,
3942                 .input  = iscsi_if_rx,
3943         };
3944         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
3945                 ISCSI_TRANSPORT_VERSION);
3946
3947         atomic_set(&iscsi_session_nr, 0);
3948
3949         err = class_register(&iscsi_transport_class);
3950         if (err)
3951                 return err;
3952
3953         err = class_register(&iscsi_endpoint_class);
3954         if (err)
3955                 goto unregister_transport_class;
3956
3957         err = class_register(&iscsi_iface_class);
3958         if (err)
3959                 goto unregister_endpoint_class;
3960
3961         err = transport_class_register(&iscsi_host_class);
3962         if (err)
3963                 goto unregister_iface_class;
3964
3965         err = transport_class_register(&iscsi_connection_class);
3966         if (err)
3967                 goto unregister_host_class;
3968
3969         err = transport_class_register(&iscsi_session_class);
3970         if (err)
3971                 goto unregister_conn_class;
3972
3973         err = bus_register(&iscsi_flashnode_bus);
3974         if (err)
3975                 goto unregister_session_class;
3976
3977         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
3978         if (!nls) {
3979                 err = -ENOBUFS;
3980                 goto unregister_flashnode_bus;
3981         }
3982
3983         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
3984         if (!iscsi_eh_timer_workq) {
3985                 err = -ENOMEM;
3986                 goto release_nls;
3987         }
3988
3989         return 0;
3990
3991 release_nls:
3992         netlink_kernel_release(nls);
3993 unregister_flashnode_bus:
3994         bus_unregister(&iscsi_flashnode_bus);
3995 unregister_session_class:
3996         transport_class_unregister(&iscsi_session_class);
3997 unregister_conn_class:
3998         transport_class_unregister(&iscsi_connection_class);
3999 unregister_host_class:
4000         transport_class_unregister(&iscsi_host_class);
4001 unregister_iface_class:
4002         class_unregister(&iscsi_iface_class);
4003 unregister_endpoint_class:
4004         class_unregister(&iscsi_endpoint_class);
4005 unregister_transport_class:
4006         class_unregister(&iscsi_transport_class);
4007         return err;
4008 }
4009
4010 static void __exit iscsi_transport_exit(void)
4011 {
4012         destroy_workqueue(iscsi_eh_timer_workq);
4013         netlink_kernel_release(nls);
4014         bus_unregister(&iscsi_flashnode_bus);
4015         transport_class_unregister(&iscsi_connection_class);
4016         transport_class_unregister(&iscsi_session_class);
4017         transport_class_unregister(&iscsi_host_class);
4018         class_unregister(&iscsi_endpoint_class);
4019         class_unregister(&iscsi_iface_class);
4020         class_unregister(&iscsi_transport_class);
4021 }
4022
4023 module_init(iscsi_transport_init);
4024 module_exit(iscsi_transport_exit);
4025
4026 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4027               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4028               "Alex Aizman <itn780@yahoo.com>");
4029 MODULE_DESCRIPTION("iSCSI Transport Interface");
4030 MODULE_LICENSE("GPL");
4031 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4032 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);