Pileus Git - ~andy/linux/blob - drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <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  * @data: pointer to data containing value to use for comparison
1023  * @fn: function pointer that does actual comparison
1024  *
1025  * Finds the flashnode session object for the passed index
1026  *
1027  * Returns:
1028  *  pointer to found flashnode session object on success
1029  *  %NULL on failure
1030  */
1031 static struct iscsi_bus_flash_session *
1032 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, void *data,
1033                              int (*fn)(struct device *dev, void *data))
1034 {
1035         struct iscsi_bus_flash_session *fnode_sess = NULL;
1036         struct device *dev;
1037
1038         dev = device_find_child(&shost->shost_gendev, data, fn);
1039         if (dev)
1040                 fnode_sess = iscsi_dev_to_flash_session(dev);
1041
1042         return fnode_sess;
1043 }
1044
1045 /**
1046  * iscsi_find_flashnode_sess - finds flashnode session entry
1047  * @shost: pointer to host data
1048  * @data: pointer to data containing value to use for comparison
1049  * @fn: function pointer that does actual comparison
1050  *
1051  * Finds the flashnode session object comparing the data passed using logic
1052  * defined in passed function pointer
1053  *
1054  * Returns:
1055  *  pointer to found flashnode session device object on success
1056  *  %NULL on failure
1057  */
1058 struct device *
1059 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1060                           int (*fn)(struct device *dev, void *data))
1061 {
1062         struct device *dev;
1063
1064         dev = device_find_child(&shost->shost_gendev, data, fn);
1065         return dev;
1066 }
1067 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1068
1069 /**
1070  * iscsi_find_flashnode_conn - finds flashnode connection entry
1071  * @fnode_sess: pointer to parent flashnode session entry
1072  * @data: pointer to data containing value to use for comparison
1073  * @fn: function pointer that does actual comparison
1074  *
1075  * Finds the flashnode connection object comparing the data passed using logic
1076  * defined in passed function pointer
1077  *
1078  * Returns:
1079  *  pointer to found flashnode connection device object on success
1080  *  %NULL on failure
1081  */
1082 struct device *
1083 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess,
1084                           void *data,
1085                           int (*fn)(struct device *dev, void *data))
1086 {
1087         struct device *dev;
1088
1089         dev = device_find_child(&fnode_sess->dev, data, fn);
1090         return dev;
1091 }
1092 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1093
1094 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1095 {
1096         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1097                 return 0;
1098
1099         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1100 }
1101
1102 /**
1103  * iscsi_destroy_flashnode_sess - destory flashnode session entry
1104  * @fnode_sess: pointer to flashnode session entry to be destroyed
1105  *
1106  * Deletes the flashnode session entry and all children flashnode connection
1107  * entries from sysfs
1108  */
1109 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1110 {
1111         int err;
1112
1113         err = device_for_each_child(&fnode_sess->dev, NULL,
1114                                     iscsi_iter_destroy_flashnode_conn_fn);
1115         if (err)
1116                 pr_err("Could not delete all connections for %s. Error %d.\n",
1117                        fnode_sess->dev.kobj.name, err);
1118
1119         device_unregister(&fnode_sess->dev);
1120 }
1121 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1122
1123 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1124 {
1125         if (!iscsi_flashnode_bus_match(dev, NULL))
1126                 return 0;
1127
1128         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1129         return 0;
1130 }
1131
1132 /**
1133  * iscsi_destroy_all_flashnode - destory all flashnode session entries
1134  * @shost: pointer to host data
1135  *
1136  * Destroys all the flashnode session entries and all corresponding children
1137  * flashnode connection entries from sysfs
1138  */
1139 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1140 {
1141         device_for_each_child(&shost->shost_gendev, NULL,
1142                               iscsi_iter_destroy_flashnode_fn);
1143 }
1144 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1145
1146 /*
1147  * BSG support
1148  */
1149 /**
1150  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1151  * @job: bsg job to be processed
1152  */
1153 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1154 {
1155         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1156         struct iscsi_bsg_request *req = job->request;
1157         struct iscsi_bsg_reply *reply = job->reply;
1158         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1159         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1160         int ret;
1161
1162         /* check if we have the msgcode value at least */
1163         if (job->request_len < sizeof(uint32_t)) {
1164                 ret = -ENOMSG;
1165                 goto fail_host_msg;
1166         }
1167
1168         /* Validate the host command */
1169         switch (req->msgcode) {
1170         case ISCSI_BSG_HST_VENDOR:
1171                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1172                 if ((shost->hostt->vendor_id == 0L) ||
1173                     (req->rqst_data.h_vendor.vendor_id !=
1174                         shost->hostt->vendor_id)) {
1175                         ret = -ESRCH;
1176                         goto fail_host_msg;
1177                 }
1178                 break;
1179         default:
1180                 ret = -EBADR;
1181                 goto fail_host_msg;
1182         }
1183
1184         /* check if we really have all the request data needed */
1185         if (job->request_len < cmdlen) {
1186                 ret = -ENOMSG;
1187                 goto fail_host_msg;
1188         }
1189
1190         ret = i->iscsi_transport->bsg_request(job);
1191         if (!ret)
1192                 return 0;
1193
1194 fail_host_msg:
1195         /* return the errno failure code as the only status */
1196         BUG_ON(job->reply_len < sizeof(uint32_t));
1197         reply->reply_payload_rcv_len = 0;
1198         reply->result = ret;
1199         job->reply_len = sizeof(uint32_t);
1200         bsg_job_done(job, ret, 0);
1201         return 0;
1202 }
1203
1204 /**
1205  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1206  * @shost: shost for iscsi_host
1207  * @ihost: iscsi_cls_host adding the structures to
1208  */
1209 static int
1210 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1211 {
1212         struct device *dev = &shost->shost_gendev;
1213         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1214         struct request_queue *q;
1215         char bsg_name[20];
1216         int ret;
1217
1218         if (!i->iscsi_transport->bsg_request)
1219                 return -ENOTSUPP;
1220
1221         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1222
1223         q = __scsi_alloc_queue(shost, bsg_request_fn);
1224         if (!q)
1225                 return -ENOMEM;
1226
1227         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
1228         if (ret) {
1229                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1230                              "initialize - no request queue\n");
1231                 blk_cleanup_queue(q);
1232                 return ret;
1233         }
1234
1235         ihost->bsg_q = q;
1236         return 0;
1237 }
1238
1239 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1240                             struct device *cdev)
1241 {
1242         struct Scsi_Host *shost = dev_to_shost(dev);
1243         struct iscsi_cls_host *ihost = shost->shost_data;
1244
1245         memset(ihost, 0, sizeof(*ihost));
1246         atomic_set(&ihost->nr_scans, 0);
1247         mutex_init(&ihost->mutex);
1248
1249         iscsi_bsg_host_add(shost, ihost);
1250         /* ignore any bsg add error - we just can't do sgio */
1251
1252         return 0;
1253 }
1254
1255 static int iscsi_remove_host(struct transport_container *tc,
1256                              struct device *dev, struct device *cdev)
1257 {
1258         struct Scsi_Host *shost = dev_to_shost(dev);
1259         struct iscsi_cls_host *ihost = shost->shost_data;
1260
1261         if (ihost->bsg_q) {
1262                 bsg_unregister_queue(ihost->bsg_q);
1263                 blk_cleanup_queue(ihost->bsg_q);
1264         }
1265         return 0;
1266 }
1267
1268 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1269                                "iscsi_host",
1270                                iscsi_setup_host,
1271                                iscsi_remove_host,
1272                                NULL);
1273
1274 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1275                                "iscsi_session",
1276                                NULL,
1277                                NULL,
1278                                NULL);
1279
1280 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1281                                "iscsi_connection",
1282                                NULL,
1283                                NULL,
1284                                NULL);
1285
1286 static struct sock *nls;
1287 static DEFINE_MUTEX(rx_queue_mutex);
1288
1289 static LIST_HEAD(sesslist);
1290 static DEFINE_SPINLOCK(sesslock);
1291 static LIST_HEAD(connlist);
1292 static DEFINE_SPINLOCK(connlock);
1293
1294 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1295 {
1296         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1297         return sess->sid;
1298 }
1299
1300 /*
1301  * Returns the matching session to a given sid
1302  */
1303 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1304 {
1305         unsigned long flags;
1306         struct iscsi_cls_session *sess;
1307
1308         spin_lock_irqsave(&sesslock, flags);
1309         list_for_each_entry(sess, &sesslist, sess_list) {
1310                 if (sess->sid == sid) {
1311                         spin_unlock_irqrestore(&sesslock, flags);
1312                         return sess;
1313                 }
1314         }
1315         spin_unlock_irqrestore(&sesslock, flags);
1316         return NULL;
1317 }
1318
1319 /*
1320  * Returns the matching connection to a given sid / cid tuple
1321  */
1322 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1323 {
1324         unsigned long flags;
1325         struct iscsi_cls_conn *conn;
1326
1327         spin_lock_irqsave(&connlock, flags);
1328         list_for_each_entry(conn, &connlist, conn_list) {
1329                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1330                         spin_unlock_irqrestore(&connlock, flags);
1331                         return conn;
1332                 }
1333         }
1334         spin_unlock_irqrestore(&connlock, flags);
1335         return NULL;
1336 }
1337
1338 /*
1339  * The following functions can be used by LLDs that allocate
1340  * their own scsi_hosts or by software iscsi LLDs
1341  */
1342 static struct {
1343         int value;
1344         char *name;
1345 } iscsi_session_state_names[] = {
1346         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1347         { ISCSI_SESSION_FAILED,         "FAILED" },
1348         { ISCSI_SESSION_FREE,           "FREE" },
1349 };
1350
1351 static const char *iscsi_session_state_name(int state)
1352 {
1353         int i;
1354         char *name = NULL;
1355
1356         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1357                 if (iscsi_session_state_names[i].value == state) {
1358                         name = iscsi_session_state_names[i].name;
1359                         break;
1360                 }
1361         }
1362         return name;
1363 }
1364
1365 int iscsi_session_chkready(struct iscsi_cls_session *session)
1366 {
1367         unsigned long flags;
1368         int err;
1369
1370         spin_lock_irqsave(&session->lock, flags);
1371         switch (session->state) {
1372         case ISCSI_SESSION_LOGGED_IN:
1373                 err = 0;
1374                 break;
1375         case ISCSI_SESSION_FAILED:
1376                 err = DID_IMM_RETRY << 16;
1377                 break;
1378         case ISCSI_SESSION_FREE:
1379                 err = DID_TRANSPORT_FAILFAST << 16;
1380                 break;
1381         default:
1382                 err = DID_NO_CONNECT << 16;
1383                 break;
1384         }
1385         spin_unlock_irqrestore(&session->lock, flags);
1386         return err;
1387 }
1388 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1389
1390 int iscsi_is_session_online(struct iscsi_cls_session *session)
1391 {
1392         unsigned long flags;
1393         int ret = 0;
1394
1395         spin_lock_irqsave(&session->lock, flags);
1396         if (session->state == ISCSI_SESSION_LOGGED_IN)
1397                 ret = 1;
1398         spin_unlock_irqrestore(&session->lock, flags);
1399         return ret;
1400 }
1401 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1402
1403 static void iscsi_session_release(struct device *dev)
1404 {
1405         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1406         struct Scsi_Host *shost;
1407
1408         shost = iscsi_session_to_shost(session);
1409         scsi_host_put(shost);
1410         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1411         kfree(session);
1412 }
1413
1414 int iscsi_is_session_dev(const struct device *dev)
1415 {
1416         return dev->release == iscsi_session_release;
1417 }
1418 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1419
1420 static int iscsi_iter_session_fn(struct device *dev, void *data)
1421 {
1422         void (* fn) (struct iscsi_cls_session *) = data;
1423
1424         if (!iscsi_is_session_dev(dev))
1425                 return 0;
1426         fn(iscsi_dev_to_session(dev));
1427         return 0;
1428 }
1429
1430 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1431                                  void (*fn)(struct iscsi_cls_session *))
1432 {
1433         device_for_each_child(&shost->shost_gendev, fn,
1434                               iscsi_iter_session_fn);
1435 }
1436 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1437
1438 /**
1439  * iscsi_scan_finished - helper to report when running scans are done
1440  * @shost: scsi host
1441  * @time: scan run time
1442  *
1443  * This function can be used by drives like qla4xxx to report to the scsi
1444  * layer when the scans it kicked off at module load time are done.
1445  */
1446 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1447 {
1448         struct iscsi_cls_host *ihost = shost->shost_data;
1449         /*
1450          * qla4xxx will have kicked off some session unblocks before calling
1451          * scsi_scan_host, so just wait for them to complete.
1452          */
1453         return !atomic_read(&ihost->nr_scans);
1454 }
1455 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1456
1457 struct iscsi_scan_data {
1458         unsigned int channel;
1459         unsigned int id;
1460         unsigned int lun;
1461 };
1462
1463 static int iscsi_user_scan_session(struct device *dev, void *data)
1464 {
1465         struct iscsi_scan_data *scan_data = data;
1466         struct iscsi_cls_session *session;
1467         struct Scsi_Host *shost;
1468         struct iscsi_cls_host *ihost;
1469         unsigned long flags;
1470         unsigned int id;
1471
1472         if (!iscsi_is_session_dev(dev))
1473                 return 0;
1474
1475         session = iscsi_dev_to_session(dev);
1476
1477         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1478
1479         shost = iscsi_session_to_shost(session);
1480         ihost = shost->shost_data;
1481
1482         mutex_lock(&ihost->mutex);
1483         spin_lock_irqsave(&session->lock, flags);
1484         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1485                 spin_unlock_irqrestore(&session->lock, flags);
1486                 goto user_scan_exit;
1487         }
1488         id = session->target_id;
1489         spin_unlock_irqrestore(&session->lock, flags);
1490
1491         if (id != ISCSI_MAX_TARGET) {
1492                 if ((scan_data->channel == SCAN_WILD_CARD ||
1493                      scan_data->channel == 0) &&
1494                     (scan_data->id == SCAN_WILD_CARD ||
1495                      scan_data->id == id))
1496                         scsi_scan_target(&session->dev, 0, id,
1497                                          scan_data->lun, 1);
1498         }
1499
1500 user_scan_exit:
1501         mutex_unlock(&ihost->mutex);
1502         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1503         return 0;
1504 }
1505
1506 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1507                            uint id, uint lun)
1508 {
1509         struct iscsi_scan_data scan_data;
1510
1511         scan_data.channel = channel;
1512         scan_data.id = id;
1513         scan_data.lun = lun;
1514
1515         return device_for_each_child(&shost->shost_gendev, &scan_data,
1516                                      iscsi_user_scan_session);
1517 }
1518
1519 static void iscsi_scan_session(struct work_struct *work)
1520 {
1521         struct iscsi_cls_session *session =
1522                         container_of(work, struct iscsi_cls_session, scan_work);
1523         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1524         struct iscsi_cls_host *ihost = shost->shost_data;
1525         struct iscsi_scan_data scan_data;
1526
1527         scan_data.channel = 0;
1528         scan_data.id = SCAN_WILD_CARD;
1529         scan_data.lun = SCAN_WILD_CARD;
1530
1531         iscsi_user_scan_session(&session->dev, &scan_data);
1532         atomic_dec(&ihost->nr_scans);
1533 }
1534
1535 /**
1536  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1537  * @cmd: scsi cmd passed to scsi eh handler
1538  *
1539  * If the session is down this function will wait for the recovery
1540  * timer to fire or for the session to be logged back in. If the
1541  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1542  * should pass this error value to the scsi eh.
1543  */
1544 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1545 {
1546         struct iscsi_cls_session *session =
1547                         starget_to_session(scsi_target(cmd->device));
1548         unsigned long flags;
1549         int ret = 0;
1550
1551         spin_lock_irqsave(&session->lock, flags);
1552         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1553                 if (session->state == ISCSI_SESSION_FREE) {
1554                         ret = FAST_IO_FAIL;
1555                         break;
1556                 }
1557                 spin_unlock_irqrestore(&session->lock, flags);
1558                 msleep(1000);
1559                 spin_lock_irqsave(&session->lock, flags);
1560         }
1561         spin_unlock_irqrestore(&session->lock, flags);
1562         return ret;
1563 }
1564 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1565
1566 static void session_recovery_timedout(struct work_struct *work)
1567 {
1568         struct iscsi_cls_session *session =
1569                 container_of(work, struct iscsi_cls_session,
1570                              recovery_work.work);
1571         unsigned long flags;
1572
1573         iscsi_cls_session_printk(KERN_INFO, session,
1574                                  "session recovery timed out after %d secs\n",
1575                                  session->recovery_tmo);
1576
1577         spin_lock_irqsave(&session->lock, flags);
1578         switch (session->state) {
1579         case ISCSI_SESSION_FAILED:
1580                 session->state = ISCSI_SESSION_FREE;
1581                 break;
1582         case ISCSI_SESSION_LOGGED_IN:
1583         case ISCSI_SESSION_FREE:
1584                 /* we raced with the unblock's flush */
1585                 spin_unlock_irqrestore(&session->lock, flags);
1586                 return;
1587         }
1588         spin_unlock_irqrestore(&session->lock, flags);
1589
1590         if (session->transport->session_recovery_timedout)
1591                 session->transport->session_recovery_timedout(session);
1592
1593         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1594         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1595         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1596 }
1597
1598 static void __iscsi_unblock_session(struct work_struct *work)
1599 {
1600         struct iscsi_cls_session *session =
1601                         container_of(work, struct iscsi_cls_session,
1602                                      unblock_work);
1603         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1604         struct iscsi_cls_host *ihost = shost->shost_data;
1605         unsigned long flags;
1606
1607         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1608         /*
1609          * The recovery and unblock work get run from the same workqueue,
1610          * so try to cancel it if it was going to run after this unblock.
1611          */
1612         cancel_delayed_work(&session->recovery_work);
1613         spin_lock_irqsave(&session->lock, flags);
1614         session->state = ISCSI_SESSION_LOGGED_IN;
1615         spin_unlock_irqrestore(&session->lock, flags);
1616         /* start IO */
1617         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1618         /*
1619          * Only do kernel scanning if the driver is properly hooked into
1620          * the async scanning code (drivers like iscsi_tcp do login and
1621          * scanning from userspace).
1622          */
1623         if (shost->hostt->scan_finished) {
1624                 if (scsi_queue_work(shost, &session->scan_work))
1625                         atomic_inc(&ihost->nr_scans);
1626         }
1627         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1628 }
1629
1630 /**
1631  * iscsi_unblock_session - set a session as logged in and start IO.
1632  * @session: iscsi session
1633  *
1634  * Mark a session as ready to accept IO.
1635  */
1636 void iscsi_unblock_session(struct iscsi_cls_session *session)
1637 {
1638         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1639         /*
1640          * make sure all the events have completed before tell the driver
1641          * it is safe
1642          */
1643         flush_workqueue(iscsi_eh_timer_workq);
1644 }
1645 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1646
1647 static void __iscsi_block_session(struct work_struct *work)
1648 {
1649         struct iscsi_cls_session *session =
1650                         container_of(work, struct iscsi_cls_session,
1651                                      block_work);
1652         unsigned long flags;
1653
1654         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1655         spin_lock_irqsave(&session->lock, flags);
1656         session->state = ISCSI_SESSION_FAILED;
1657         spin_unlock_irqrestore(&session->lock, flags);
1658         scsi_target_block(&session->dev);
1659         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1660         if (session->recovery_tmo >= 0)
1661                 queue_delayed_work(iscsi_eh_timer_workq,
1662                                    &session->recovery_work,
1663                                    session->recovery_tmo * HZ);
1664 }
1665
1666 void iscsi_block_session(struct iscsi_cls_session *session)
1667 {
1668         queue_work(iscsi_eh_timer_workq, &session->block_work);
1669 }
1670 EXPORT_SYMBOL_GPL(iscsi_block_session);
1671
1672 static void __iscsi_unbind_session(struct work_struct *work)
1673 {
1674         struct iscsi_cls_session *session =
1675                         container_of(work, struct iscsi_cls_session,
1676                                      unbind_work);
1677         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1678         struct iscsi_cls_host *ihost = shost->shost_data;
1679         unsigned long flags;
1680         unsigned int target_id;
1681
1682         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1683
1684         /* Prevent new scans and make sure scanning is not in progress */
1685         mutex_lock(&ihost->mutex);
1686         spin_lock_irqsave(&session->lock, flags);
1687         if (session->target_id == ISCSI_MAX_TARGET) {
1688                 spin_unlock_irqrestore(&session->lock, flags);
1689                 mutex_unlock(&ihost->mutex);
1690                 return;
1691         }
1692
1693         target_id = session->target_id;
1694         session->target_id = ISCSI_MAX_TARGET;
1695         spin_unlock_irqrestore(&session->lock, flags);
1696         mutex_unlock(&ihost->mutex);
1697
1698         if (session->ida_used)
1699                 ida_simple_remove(&iscsi_sess_ida, target_id);
1700
1701         scsi_remove_target(&session->dev);
1702         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1703         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1704 }
1705
1706 struct iscsi_cls_session *
1707 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1708                     int dd_size)
1709 {
1710         struct iscsi_cls_session *session;
1711
1712         session = kzalloc(sizeof(*session) + dd_size,
1713                           GFP_KERNEL);
1714         if (!session)
1715                 return NULL;
1716
1717         session->transport = transport;
1718         session->creator = -1;
1719         session->recovery_tmo = 120;
1720         session->state = ISCSI_SESSION_FREE;
1721         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1722         INIT_LIST_HEAD(&session->sess_list);
1723         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1724         INIT_WORK(&session->block_work, __iscsi_block_session);
1725         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1726         INIT_WORK(&session->scan_work, iscsi_scan_session);
1727         spin_lock_init(&session->lock);
1728
1729         /* this is released in the dev's release function */
1730         scsi_host_get(shost);
1731         session->dev.parent = &shost->shost_gendev;
1732         session->dev.release = iscsi_session_release;
1733         device_initialize(&session->dev);
1734         if (dd_size)
1735                 session->dd_data = &session[1];
1736
1737         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1738         return session;
1739 }
1740 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1741
1742 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1743 {
1744         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1745         struct iscsi_cls_host *ihost;
1746         unsigned long flags;
1747         int id = 0;
1748         int err;
1749
1750         ihost = shost->shost_data;
1751         session->sid = atomic_add_return(1, &iscsi_session_nr);
1752
1753         if (target_id == ISCSI_MAX_TARGET) {
1754                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
1755
1756                 if (id < 0) {
1757                         iscsi_cls_session_printk(KERN_ERR, session,
1758                                         "Failure in Target ID Allocation\n");
1759                         return id;
1760                 }
1761                 session->target_id = (unsigned int)id;
1762                 session->ida_used = true;
1763         } else
1764                 session->target_id = target_id;
1765
1766         dev_set_name(&session->dev, "session%u", session->sid);
1767         err = device_add(&session->dev);
1768         if (err) {
1769                 iscsi_cls_session_printk(KERN_ERR, session,
1770                                          "could not register session's dev\n");
1771                 goto release_ida;
1772         }
1773         transport_register_device(&session->dev);
1774
1775         spin_lock_irqsave(&sesslock, flags);
1776         list_add(&session->sess_list, &sesslist);
1777         spin_unlock_irqrestore(&sesslock, flags);
1778
1779         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1780         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1781         return 0;
1782
1783 release_ida:
1784         if (session->ida_used)
1785                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
1786
1787         return err;
1788 }
1789 EXPORT_SYMBOL_GPL(iscsi_add_session);
1790
1791 /**
1792  * iscsi_create_session - create iscsi class session
1793  * @shost: scsi host
1794  * @transport: iscsi transport
1795  * @dd_size: private driver data size
1796  * @target_id: which target
1797  *
1798  * This can be called from a LLD or iscsi_transport.
1799  */
1800 struct iscsi_cls_session *
1801 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1802                      int dd_size, unsigned int target_id)
1803 {
1804         struct iscsi_cls_session *session;
1805
1806         session = iscsi_alloc_session(shost, transport, dd_size);
1807         if (!session)
1808                 return NULL;
1809
1810         if (iscsi_add_session(session, target_id)) {
1811                 iscsi_free_session(session);
1812                 return NULL;
1813         }
1814         return session;
1815 }
1816 EXPORT_SYMBOL_GPL(iscsi_create_session);
1817
1818 static void iscsi_conn_release(struct device *dev)
1819 {
1820         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1821         struct device *parent = conn->dev.parent;
1822
1823         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1824         kfree(conn);
1825         put_device(parent);
1826 }
1827
1828 static int iscsi_is_conn_dev(const struct device *dev)
1829 {
1830         return dev->release == iscsi_conn_release;
1831 }
1832
1833 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1834 {
1835         if (!iscsi_is_conn_dev(dev))
1836                 return 0;
1837         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1838 }
1839
1840 void iscsi_remove_session(struct iscsi_cls_session *session)
1841 {
1842         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1843         unsigned long flags;
1844         int err;
1845
1846         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1847
1848         spin_lock_irqsave(&sesslock, flags);
1849         list_del(&session->sess_list);
1850         spin_unlock_irqrestore(&sesslock, flags);
1851
1852         /* make sure there are no blocks/unblocks queued */
1853         flush_workqueue(iscsi_eh_timer_workq);
1854         /* make sure the timedout callout is not running */
1855         if (!cancel_delayed_work(&session->recovery_work))
1856                 flush_workqueue(iscsi_eh_timer_workq);
1857         /*
1858          * If we are blocked let commands flow again. The lld or iscsi
1859          * layer should set up the queuecommand to fail commands.
1860          * We assume that LLD will not be calling block/unblock while
1861          * removing the session.
1862          */
1863         spin_lock_irqsave(&session->lock, flags);
1864         session->state = ISCSI_SESSION_FREE;
1865         spin_unlock_irqrestore(&session->lock, flags);
1866
1867         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1868         /* flush running scans then delete devices */
1869         scsi_flush_work(shost);
1870         __iscsi_unbind_session(&session->unbind_work);
1871
1872         /* hw iscsi may not have removed all connections from session */
1873         err = device_for_each_child(&session->dev, NULL,
1874                                     iscsi_iter_destroy_conn_fn);
1875         if (err)
1876                 iscsi_cls_session_printk(KERN_ERR, session,
1877                                          "Could not delete all connections "
1878                                          "for session. Error %d.\n", err);
1879
1880         transport_unregister_device(&session->dev);
1881
1882         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1883         device_del(&session->dev);
1884 }
1885 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1886
1887 void iscsi_free_session(struct iscsi_cls_session *session)
1888 {
1889         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1890         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1891         put_device(&session->dev);
1892 }
1893 EXPORT_SYMBOL_GPL(iscsi_free_session);
1894
1895 /**
1896  * iscsi_destroy_session - destroy iscsi session
1897  * @session: iscsi_session
1898  *
1899  * Can be called by a LLD or iscsi_transport. There must not be
1900  * any running connections.
1901  */
1902 int iscsi_destroy_session(struct iscsi_cls_session *session)
1903 {
1904         iscsi_remove_session(session);
1905         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1906         iscsi_free_session(session);
1907         return 0;
1908 }
1909 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1910
1911 /**
1912  * iscsi_create_conn - create iscsi class connection
1913  * @session: iscsi cls session
1914  * @dd_size: private driver data size
1915  * @cid: connection id
1916  *
1917  * This can be called from a LLD or iscsi_transport. The connection
1918  * is child of the session so cid must be unique for all connections
1919  * on the session.
1920  *
1921  * Since we do not support MCS, cid will normally be zero. In some cases
1922  * for software iscsi we could be trying to preallocate a connection struct
1923  * in which case there could be two connection structs and cid would be
1924  * non-zero.
1925  */
1926 struct iscsi_cls_conn *
1927 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1928 {
1929         struct iscsi_transport *transport = session->transport;
1930         struct iscsi_cls_conn *conn;
1931         unsigned long flags;
1932         int err;
1933
1934         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1935         if (!conn)
1936                 return NULL;
1937         if (dd_size)
1938                 conn->dd_data = &conn[1];
1939
1940         mutex_init(&conn->ep_mutex);
1941         INIT_LIST_HEAD(&conn->conn_list);
1942         conn->transport = transport;
1943         conn->cid = cid;
1944
1945         /* this is released in the dev's release function */
1946         if (!get_device(&session->dev))
1947                 goto free_conn;
1948
1949         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1950         conn->dev.parent = &session->dev;
1951         conn->dev.release = iscsi_conn_release;
1952         err = device_register(&conn->dev);
1953         if (err) {
1954                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1955                                          "register connection's dev\n");
1956                 goto release_parent_ref;
1957         }
1958         transport_register_device(&conn->dev);
1959
1960         spin_lock_irqsave(&connlock, flags);
1961         list_add(&conn->conn_list, &connlist);
1962         spin_unlock_irqrestore(&connlock, flags);
1963
1964         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1965         return conn;
1966
1967 release_parent_ref:
1968         put_device(&session->dev);
1969 free_conn:
1970         kfree(conn);
1971         return NULL;
1972 }
1973
1974 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1975
1976 /**
1977  * iscsi_destroy_conn - destroy iscsi class connection
1978  * @conn: iscsi cls session
1979  *
1980  * This can be called from a LLD or iscsi_transport.
1981  */
1982 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1983 {
1984         unsigned long flags;
1985
1986         spin_lock_irqsave(&connlock, flags);
1987         list_del(&conn->conn_list);
1988         spin_unlock_irqrestore(&connlock, flags);
1989
1990         transport_unregister_device(&conn->dev);
1991         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1992         device_unregister(&conn->dev);
1993         return 0;
1994 }
1995 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1996
1997 /*
1998  * iscsi interface functions
1999  */
2000 static struct iscsi_internal *
2001 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2002 {
2003         struct iscsi_internal *priv;
2004         unsigned long flags;
2005
2006         spin_lock_irqsave(&iscsi_transport_lock, flags);
2007         list_for_each_entry(priv, &iscsi_transports, list) {
2008                 if (tt == priv->iscsi_transport) {
2009                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2010                         return priv;
2011                 }
2012         }
2013         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2014         return NULL;
2015 }
2016
2017 static int
2018 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2019 {
2020         return nlmsg_multicast(nls, skb, 0, group, gfp);
2021 }
2022
2023 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2024                    char *data, uint32_t data_size)
2025 {
2026         struct nlmsghdr *nlh;
2027         struct sk_buff *skb;
2028         struct iscsi_uevent *ev;
2029         char *pdu;
2030         struct iscsi_internal *priv;
2031         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2032                                    data_size);
2033
2034         priv = iscsi_if_transport_lookup(conn->transport);
2035         if (!priv)
2036                 return -EINVAL;
2037
2038         skb = alloc_skb(len, GFP_ATOMIC);
2039         if (!skb) {
2040                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2041                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2042                                       "control PDU: OOM\n");
2043                 return -ENOMEM;
2044         }
2045
2046         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2047         ev = nlmsg_data(nlh);
2048         memset(ev, 0, sizeof(*ev));
2049         ev->transport_handle = iscsi_handle(conn->transport);
2050         ev->type = ISCSI_KEVENT_RECV_PDU;
2051         ev->r.recv_req.cid = conn->cid;
2052         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2053         pdu = (char*)ev + sizeof(*ev);
2054         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2055         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2056
2057         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2058 }
2059 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2060
2061 int iscsi_offload_mesg(struct Scsi_Host *shost,
2062                        struct iscsi_transport *transport, uint32_t type,
2063                        char *data, uint16_t data_size)
2064 {
2065         struct nlmsghdr *nlh;
2066         struct sk_buff *skb;
2067         struct iscsi_uevent *ev;
2068         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2069
2070         skb = alloc_skb(len, GFP_ATOMIC);
2071         if (!skb) {
2072                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2073                 return -ENOMEM;
2074         }
2075
2076         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2077         ev = nlmsg_data(nlh);
2078         memset(ev, 0, sizeof(*ev));
2079         ev->type = type;
2080         ev->transport_handle = iscsi_handle(transport);
2081         switch (type) {
2082         case ISCSI_KEVENT_PATH_REQ:
2083                 ev->r.req_path.host_no = shost->host_no;
2084                 break;
2085         case ISCSI_KEVENT_IF_DOWN:
2086                 ev->r.notify_if_down.host_no = shost->host_no;
2087                 break;
2088         }
2089
2090         memcpy((char *)ev + sizeof(*ev), data, data_size);
2091
2092         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2093 }
2094 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2095
2096 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2097 {
2098         struct nlmsghdr *nlh;
2099         struct sk_buff  *skb;
2100         struct iscsi_uevent *ev;
2101         struct iscsi_internal *priv;
2102         int len = nlmsg_total_size(sizeof(*ev));
2103
2104         priv = iscsi_if_transport_lookup(conn->transport);
2105         if (!priv)
2106                 return;
2107
2108         skb = alloc_skb(len, GFP_ATOMIC);
2109         if (!skb) {
2110                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2111                                       "conn error (%d)\n", error);
2112                 return;
2113         }
2114
2115         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2116         ev = nlmsg_data(nlh);
2117         ev->transport_handle = iscsi_handle(conn->transport);
2118         ev->type = ISCSI_KEVENT_CONN_ERROR;
2119         ev->r.connerror.error = error;
2120         ev->r.connerror.cid = conn->cid;
2121         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2122
2123         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2124
2125         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2126                               error);
2127 }
2128 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2129
2130 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2131                             enum iscsi_conn_state state)
2132 {
2133         struct nlmsghdr *nlh;
2134         struct sk_buff  *skb;
2135         struct iscsi_uevent *ev;
2136         struct iscsi_internal *priv;
2137         int len = nlmsg_total_size(sizeof(*ev));
2138
2139         priv = iscsi_if_transport_lookup(conn->transport);
2140         if (!priv)
2141                 return;
2142
2143         skb = alloc_skb(len, GFP_ATOMIC);
2144         if (!skb) {
2145                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2146                                       "conn login (%d)\n", state);
2147                 return;
2148         }
2149
2150         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2151         ev = nlmsg_data(nlh);
2152         ev->transport_handle = iscsi_handle(conn->transport);
2153         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2154         ev->r.conn_login.state = state;
2155         ev->r.conn_login.cid = conn->cid;
2156         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2157         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2158
2159         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2160                               state);
2161 }
2162 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2163
2164 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2165                            enum iscsi_host_event_code code, uint32_t data_size,
2166                            uint8_t *data)
2167 {
2168         struct nlmsghdr *nlh;
2169         struct sk_buff *skb;
2170         struct iscsi_uevent *ev;
2171         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2172
2173         skb = alloc_skb(len, GFP_NOIO);
2174         if (!skb) {
2175                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2176                        host_no, code);
2177                 return;
2178         }
2179
2180         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2181         ev = nlmsg_data(nlh);
2182         ev->transport_handle = iscsi_handle(transport);
2183         ev->type = ISCSI_KEVENT_HOST_EVENT;
2184         ev->r.host_event.host_no = host_no;
2185         ev->r.host_event.code = code;
2186         ev->r.host_event.data_size = data_size;
2187
2188         if (data_size)
2189                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2190
2191         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2192 }
2193 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2194
2195 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2196                            uint32_t status, uint32_t pid, uint32_t data_size,
2197                            uint8_t *data)
2198 {
2199         struct nlmsghdr *nlh;
2200         struct sk_buff *skb;
2201         struct iscsi_uevent *ev;
2202         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2203
2204         skb = alloc_skb(len, GFP_NOIO);
2205         if (!skb) {
2206                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2207                 return;
2208         }
2209
2210         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2211         ev = nlmsg_data(nlh);
2212         ev->transport_handle = iscsi_handle(transport);
2213         ev->type = ISCSI_KEVENT_PING_COMP;
2214         ev->r.ping_comp.host_no = host_no;
2215         ev->r.ping_comp.status = status;
2216         ev->r.ping_comp.pid = pid;
2217         ev->r.ping_comp.data_size = data_size;
2218         memcpy((char *)ev + sizeof(*ev), data, data_size);
2219
2220         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2221 }
2222 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2223
2224 static int
2225 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
2226                     void *payload, int size)
2227 {
2228         struct sk_buff  *skb;
2229         struct nlmsghdr *nlh;
2230         int len = nlmsg_total_size(size);
2231         int flags = multi ? NLM_F_MULTI : 0;
2232         int t = done ? NLMSG_DONE : type;
2233
2234         skb = alloc_skb(len, GFP_ATOMIC);
2235         if (!skb) {
2236                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2237                 return -ENOMEM;
2238         }
2239
2240         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
2241         nlh->nlmsg_flags = flags;
2242         memcpy(nlmsg_data(nlh), payload, size);
2243         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
2244 }
2245
2246 static int
2247 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2248 {
2249         struct iscsi_uevent *ev = nlmsg_data(nlh);
2250         struct iscsi_stats *stats;
2251         struct sk_buff *skbstat;
2252         struct iscsi_cls_conn *conn;
2253         struct nlmsghdr *nlhstat;
2254         struct iscsi_uevent *evstat;
2255         struct iscsi_internal *priv;
2256         int len = nlmsg_total_size(sizeof(*ev) +
2257                                    sizeof(struct iscsi_stats) +
2258                                    sizeof(struct iscsi_stats_custom) *
2259                                    ISCSI_STATS_CUSTOM_MAX);
2260         int err = 0;
2261
2262         priv = iscsi_if_transport_lookup(transport);
2263         if (!priv)
2264                 return -EINVAL;
2265
2266         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2267         if (!conn)
2268                 return -EEXIST;
2269
2270         do {
2271                 int actual_size;
2272
2273                 skbstat = alloc_skb(len, GFP_ATOMIC);
2274                 if (!skbstat) {
2275                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2276                                               "deliver stats: OOM\n");
2277                         return -ENOMEM;
2278                 }
2279
2280                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2281                                       (len - sizeof(*nlhstat)), 0);
2282                 evstat = nlmsg_data(nlhstat);
2283                 memset(evstat, 0, sizeof(*evstat));
2284                 evstat->transport_handle = iscsi_handle(conn->transport);
2285                 evstat->type = nlh->nlmsg_type;
2286                 evstat->u.get_stats.cid =
2287                         ev->u.get_stats.cid;
2288                 evstat->u.get_stats.sid =
2289                         ev->u.get_stats.sid;
2290                 stats = (struct iscsi_stats *)
2291                         ((char*)evstat + sizeof(*evstat));
2292                 memset(stats, 0, sizeof(*stats));
2293
2294                 transport->get_stats(conn, stats);
2295                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2296                                                sizeof(struct iscsi_stats) +
2297                                                sizeof(struct iscsi_stats_custom) *
2298                                                stats->custom_length);
2299                 actual_size -= sizeof(*nlhstat);
2300                 actual_size = nlmsg_msg_size(actual_size);
2301                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2302                 nlhstat->nlmsg_len = actual_size;
2303
2304                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2305                                           GFP_ATOMIC);
2306         } while (err < 0 && err != -ECONNREFUSED);
2307
2308         return err;
2309 }
2310
2311 /**
2312  * iscsi_session_event - send session destr. completion event
2313  * @session: iscsi class session
2314  * @event: type of event
2315  */
2316 int iscsi_session_event(struct iscsi_cls_session *session,
2317                         enum iscsi_uevent_e event)
2318 {
2319         struct iscsi_internal *priv;
2320         struct Scsi_Host *shost;
2321         struct iscsi_uevent *ev;
2322         struct sk_buff  *skb;
2323         struct nlmsghdr *nlh;
2324         int rc, len = nlmsg_total_size(sizeof(*ev));
2325
2326         priv = iscsi_if_transport_lookup(session->transport);
2327         if (!priv)
2328                 return -EINVAL;
2329         shost = iscsi_session_to_shost(session);
2330
2331         skb = alloc_skb(len, GFP_KERNEL);
2332         if (!skb) {
2333                 iscsi_cls_session_printk(KERN_ERR, session,
2334                                          "Cannot notify userspace of session "
2335                                          "event %u\n", event);
2336                 return -ENOMEM;
2337         }
2338
2339         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2340         ev = nlmsg_data(nlh);
2341         ev->transport_handle = iscsi_handle(session->transport);
2342
2343         ev->type = event;
2344         switch (event) {
2345         case ISCSI_KEVENT_DESTROY_SESSION:
2346                 ev->r.d_session.host_no = shost->host_no;
2347                 ev->r.d_session.sid = session->sid;
2348                 break;
2349         case ISCSI_KEVENT_CREATE_SESSION:
2350                 ev->r.c_session_ret.host_no = shost->host_no;
2351                 ev->r.c_session_ret.sid = session->sid;
2352                 break;
2353         case ISCSI_KEVENT_UNBIND_SESSION:
2354                 ev->r.unbind_session.host_no = shost->host_no;
2355                 ev->r.unbind_session.sid = session->sid;
2356                 break;
2357         default:
2358                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2359                                          "%u.\n", event);
2360                 kfree_skb(skb);
2361                 return -EINVAL;
2362         }
2363
2364         /*
2365          * this will occur if the daemon is not up, so we just warn
2366          * the user and when the daemon is restarted it will handle it
2367          */
2368         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2369         if (rc == -ESRCH)
2370                 iscsi_cls_session_printk(KERN_ERR, session,
2371                                          "Cannot notify userspace of session "
2372                                          "event %u. Check iscsi daemon\n",
2373                                          event);
2374
2375         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2376                                 event, rc);
2377         return rc;
2378 }
2379 EXPORT_SYMBOL_GPL(iscsi_session_event);
2380
2381 static int
2382 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2383                         struct iscsi_uevent *ev, pid_t pid,
2384                         uint32_t initial_cmdsn, uint16_t cmds_max,
2385                         uint16_t queue_depth)
2386 {
2387         struct iscsi_transport *transport = priv->iscsi_transport;
2388         struct iscsi_cls_session *session;
2389         struct Scsi_Host *shost;
2390
2391         session = transport->create_session(ep, cmds_max, queue_depth,
2392                                             initial_cmdsn);
2393         if (!session)
2394                 return -ENOMEM;
2395
2396         session->creator = pid;
2397         shost = iscsi_session_to_shost(session);
2398         ev->r.c_session_ret.host_no = shost->host_no;
2399         ev->r.c_session_ret.sid = session->sid;
2400         ISCSI_DBG_TRANS_SESSION(session,
2401                                 "Completed creating transport session\n");
2402         return 0;
2403 }
2404
2405 static int
2406 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2407 {
2408         struct iscsi_cls_conn *conn;
2409         struct iscsi_cls_session *session;
2410
2411         session = iscsi_session_lookup(ev->u.c_conn.sid);
2412         if (!session) {
2413                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2414                        ev->u.c_conn.sid);
2415                 return -EINVAL;
2416         }
2417
2418         conn = transport->create_conn(session, ev->u.c_conn.cid);
2419         if (!conn) {
2420                 iscsi_cls_session_printk(KERN_ERR, session,
2421                                          "couldn't create a new connection.");
2422                 return -ENOMEM;
2423         }
2424
2425         ev->r.c_conn_ret.sid = session->sid;
2426         ev->r.c_conn_ret.cid = conn->cid;
2427
2428         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2429         return 0;
2430 }
2431
2432 static int
2433 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2434 {
2435         struct iscsi_cls_conn *conn;
2436
2437         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2438         if (!conn)
2439                 return -EINVAL;
2440
2441         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2442         if (transport->destroy_conn)
2443                 transport->destroy_conn(conn);
2444
2445         return 0;
2446 }
2447
2448 static int
2449 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2450 {
2451         char *data = (char*)ev + sizeof(*ev);
2452         struct iscsi_cls_conn *conn;
2453         struct iscsi_cls_session *session;
2454         int err = 0, value = 0;
2455
2456         session = iscsi_session_lookup(ev->u.set_param.sid);
2457         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2458         if (!conn || !session)
2459                 return -EINVAL;
2460
2461         switch (ev->u.set_param.param) {
2462         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2463                 sscanf(data, "%d", &value);
2464                 session->recovery_tmo = value;
2465                 break;
2466         default:
2467                 err = transport->set_param(conn, ev->u.set_param.param,
2468                                            data, ev->u.set_param.len);
2469         }
2470
2471         return err;
2472 }
2473
2474 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2475                                struct iscsi_uevent *ev, int msg_type)
2476 {
2477         struct iscsi_endpoint *ep;
2478         struct sockaddr *dst_addr;
2479         struct Scsi_Host *shost = NULL;
2480         int non_blocking, err = 0;
2481
2482         if (!transport->ep_connect)
2483                 return -EINVAL;
2484
2485         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2486                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2487                 if (!shost) {
2488                         printk(KERN_ERR "ep connect failed. Could not find "
2489                                "host no %u\n",
2490                                ev->u.ep_connect_through_host.host_no);
2491                         return -ENODEV;
2492                 }
2493                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2494         } else
2495                 non_blocking = ev->u.ep_connect.non_blocking;
2496
2497         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2498         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2499         if (IS_ERR(ep)) {
2500                 err = PTR_ERR(ep);
2501                 goto release_host;
2502         }
2503
2504         ev->r.ep_connect_ret.handle = ep->id;
2505 release_host:
2506         if (shost)
2507                 scsi_host_put(shost);
2508         return err;
2509 }
2510
2511 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2512                                   u64 ep_handle)
2513 {
2514         struct iscsi_cls_conn *conn;
2515         struct iscsi_endpoint *ep;
2516
2517         if (!transport->ep_disconnect)
2518                 return -EINVAL;
2519
2520         ep = iscsi_lookup_endpoint(ep_handle);
2521         if (!ep)
2522                 return -EINVAL;
2523         conn = ep->conn;
2524         if (conn) {
2525                 mutex_lock(&conn->ep_mutex);
2526                 conn->ep = NULL;
2527                 mutex_unlock(&conn->ep_mutex);
2528         }
2529
2530         transport->ep_disconnect(ep);
2531         return 0;
2532 }
2533
2534 static int
2535 iscsi_if_transport_ep(struct iscsi_transport *transport,
2536                       struct iscsi_uevent *ev, int msg_type)
2537 {
2538         struct iscsi_endpoint *ep;
2539         int rc = 0;
2540
2541         switch (msg_type) {
2542         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2543         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2544                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2545                 break;
2546         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2547                 if (!transport->ep_poll)
2548                         return -EINVAL;
2549
2550                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2551                 if (!ep)
2552                         return -EINVAL;
2553
2554                 ev->r.retcode = transport->ep_poll(ep,
2555                                                    ev->u.ep_poll.timeout_ms);
2556                 break;
2557         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2558                 rc = iscsi_if_ep_disconnect(transport,
2559                                             ev->u.ep_disconnect.ep_handle);
2560                 break;
2561         }
2562         return rc;
2563 }
2564
2565 static int
2566 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2567                 struct iscsi_uevent *ev)
2568 {
2569         struct Scsi_Host *shost;
2570         struct sockaddr *dst_addr;
2571         int err;
2572
2573         if (!transport->tgt_dscvr)
2574                 return -EINVAL;
2575
2576         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2577         if (!shost) {
2578                 printk(KERN_ERR "target discovery could not find host no %u\n",
2579                        ev->u.tgt_dscvr.host_no);
2580                 return -ENODEV;
2581         }
2582
2583
2584         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2585         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2586                                    ev->u.tgt_dscvr.enable, dst_addr);
2587         scsi_host_put(shost);
2588         return err;
2589 }
2590
2591 static int
2592 iscsi_set_host_param(struct iscsi_transport *transport,
2593                      struct iscsi_uevent *ev)
2594 {
2595         char *data = (char*)ev + sizeof(*ev);
2596         struct Scsi_Host *shost;
2597         int err;
2598
2599         if (!transport->set_host_param)
2600                 return -ENOSYS;
2601
2602         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2603         if (!shost) {
2604                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2605                        ev->u.set_host_param.host_no);
2606                 return -ENODEV;
2607         }
2608
2609         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2610                                         data, ev->u.set_host_param.len);
2611         scsi_host_put(shost);
2612         return err;
2613 }
2614
2615 static int
2616 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2617 {
2618         struct Scsi_Host *shost;
2619         struct iscsi_path *params;
2620         int err;
2621
2622         if (!transport->set_path)
2623                 return -ENOSYS;
2624
2625         shost = scsi_host_lookup(ev->u.set_path.host_no);
2626         if (!shost) {
2627                 printk(KERN_ERR "set path could not find host no %u\n",
2628                        ev->u.set_path.host_no);
2629                 return -ENODEV;
2630         }
2631
2632         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2633         err = transport->set_path(shost, params);
2634
2635         scsi_host_put(shost);
2636         return err;
2637 }
2638
2639 static int
2640 iscsi_set_iface_params(struct iscsi_transport *transport,
2641                        struct iscsi_uevent *ev, uint32_t len)
2642 {
2643         char *data = (char *)ev + sizeof(*ev);
2644         struct Scsi_Host *shost;
2645         int err;
2646
2647         if (!transport->set_iface_param)
2648                 return -ENOSYS;
2649
2650         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2651         if (!shost) {
2652                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2653                        ev->u.set_iface_params.host_no);
2654                 return -ENODEV;
2655         }
2656
2657         err = transport->set_iface_param(shost, data, len);
2658         scsi_host_put(shost);
2659         return err;
2660 }
2661
2662 static int
2663 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2664 {
2665         struct Scsi_Host *shost;
2666         struct sockaddr *dst_addr;
2667         int err;
2668
2669         if (!transport->send_ping)
2670                 return -ENOSYS;
2671
2672         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2673         if (!shost) {
2674                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
2675                        ev->u.iscsi_ping.host_no);
2676                 return -ENODEV;
2677         }
2678
2679         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
2680         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
2681                                    ev->u.iscsi_ping.iface_type,
2682                                    ev->u.iscsi_ping.payload_size,
2683                                    ev->u.iscsi_ping.pid,
2684                                    dst_addr);
2685         scsi_host_put(shost);
2686         return err;
2687 }
2688
2689 static int
2690 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2691 {
2692         struct iscsi_uevent *ev = nlmsg_data(nlh);
2693         struct Scsi_Host *shost = NULL;
2694         struct iscsi_chap_rec *chap_rec;
2695         struct iscsi_internal *priv;
2696         struct sk_buff *skbchap;
2697         struct nlmsghdr *nlhchap;
2698         struct iscsi_uevent *evchap;
2699         uint32_t chap_buf_size;
2700         int len, err = 0;
2701         char *buf;
2702
2703         if (!transport->get_chap)
2704                 return -EINVAL;
2705
2706         priv = iscsi_if_transport_lookup(transport);
2707         if (!priv)
2708                 return -EINVAL;
2709
2710         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
2711         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
2712
2713         shost = scsi_host_lookup(ev->u.get_chap.host_no);
2714         if (!shost) {
2715                 printk(KERN_ERR "%s: failed. Cound not find host no %u\n",
2716                        __func__, ev->u.get_chap.host_no);
2717                 return -ENODEV;
2718         }
2719
2720         do {
2721                 int actual_size;
2722
2723                 skbchap = alloc_skb(len, GFP_KERNEL);
2724                 if (!skbchap) {
2725                         printk(KERN_ERR "can not deliver chap: OOM\n");
2726                         err = -ENOMEM;
2727                         goto exit_get_chap;
2728                 }
2729
2730                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
2731                                       (len - sizeof(*nlhchap)), 0);
2732                 evchap = nlmsg_data(nlhchap);
2733                 memset(evchap, 0, sizeof(*evchap));
2734                 evchap->transport_handle = iscsi_handle(transport);
2735                 evchap->type = nlh->nlmsg_type;
2736                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
2737                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
2738                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
2739                 buf = (char *) ((char *)evchap + sizeof(*evchap));
2740                 memset(buf, 0, chap_buf_size);
2741
2742                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
2743                                     &evchap->u.get_chap.num_entries, buf);
2744
2745                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
2746                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
2747                 nlhchap->nlmsg_len = actual_size;
2748
2749                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
2750                                           GFP_KERNEL);
2751         } while (err < 0 && err != -ECONNREFUSED);
2752
2753 exit_get_chap:
2754         scsi_host_put(shost);
2755         return err;
2756 }
2757
2758 static int iscsi_delete_chap(struct iscsi_transport *transport,
2759                              struct iscsi_uevent *ev)
2760 {
2761         struct Scsi_Host *shost;
2762         int err = 0;
2763
2764         if (!transport->delete_chap)
2765                 return -ENOSYS;
2766
2767         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
2768         if (!shost) {
2769                 printk(KERN_ERR "%s could not find host no %u\n",
2770                        __func__, ev->u.delete_chap.host_no);
2771                 return -ENODEV;
2772         }
2773
2774         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
2775         scsi_host_put(shost);
2776         return err;
2777 }
2778
2779 static const struct {
2780         enum iscsi_discovery_parent_type value;
2781         char                            *name;
2782 } iscsi_discovery_parent_names[] = {
2783         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
2784         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
2785         {ISCSI_DISC_PARENT_ISNS,        "isns" },
2786 };
2787
2788 char *iscsi_get_discovery_parent_name(int parent_type)
2789 {
2790         int i;
2791         char *state = "Unknown!";
2792
2793         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
2794                 if (iscsi_discovery_parent_names[i].value & parent_type) {
2795                         state = iscsi_discovery_parent_names[i].name;
2796                         break;
2797                 }
2798         }
2799         return state;
2800 }
2801 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
2802
2803 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
2804                                      struct iscsi_uevent *ev, uint32_t len)
2805 {
2806         char *data = (char *)ev + sizeof(*ev);
2807         struct Scsi_Host *shost;
2808         struct iscsi_bus_flash_session *fnode_sess;
2809         struct iscsi_bus_flash_conn *fnode_conn;
2810         struct device *dev;
2811         uint32_t *idx;
2812         int err = 0;
2813
2814         if (!transport->set_flashnode_param) {
2815                 err = -ENOSYS;
2816                 goto exit_set_fnode;
2817         }
2818
2819         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
2820         if (!shost) {
2821                 pr_err("%s could not find host no %u\n",
2822                        __func__, ev->u.set_flashnode.host_no);
2823                 err = -ENODEV;
2824                 goto put_host;
2825         }
2826
2827         idx = &ev->u.set_flashnode.flashnode_idx;
2828         fnode_sess = iscsi_get_flashnode_by_index(shost, idx,
2829                                                   flashnode_match_index);
2830         if (!fnode_sess) {
2831                 pr_err("%s could not find flashnode %u for host no %u\n",
2832                        __func__, *idx, ev->u.set_flashnode.host_no);
2833                 err = -ENODEV;
2834                 goto put_host;
2835         }
2836
2837         dev = iscsi_find_flashnode_conn(fnode_sess, NULL,
2838                                         iscsi_is_flashnode_conn_dev);
2839         if (!dev) {
2840                 err = -ENODEV;
2841                 goto put_host;
2842         }
2843
2844         fnode_conn = iscsi_dev_to_flash_conn(dev);
2845         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
2846
2847 put_host:
2848         scsi_host_put(shost);
2849
2850 exit_set_fnode:
2851         return err;
2852 }
2853
2854 static int iscsi_new_flashnode(struct iscsi_transport *transport,
2855                                struct iscsi_uevent *ev, uint32_t len)
2856 {
2857         char *data = (char *)ev + sizeof(*ev);
2858         struct Scsi_Host *shost;
2859         int index;
2860         int err = 0;
2861
2862         if (!transport->new_flashnode) {
2863                 err = -ENOSYS;
2864                 goto exit_new_fnode;
2865         }
2866
2867         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
2868         if (!shost) {
2869                 pr_err("%s could not find host no %u\n",
2870                        __func__, ev->u.new_flashnode.host_no);
2871                 err = -ENODEV;
2872                 goto put_host;
2873         }
2874
2875         index = transport->new_flashnode(shost, data, len);
2876
2877         if (index >= 0)
2878                 ev->r.new_flashnode_ret.flashnode_idx = index;
2879         else
2880                 err = -EIO;
2881
2882 put_host:
2883         scsi_host_put(shost);
2884
2885 exit_new_fnode:
2886         return err;
2887 }
2888
2889 static int iscsi_del_flashnode(struct iscsi_transport *transport,
2890                                struct iscsi_uevent *ev)
2891 {
2892         struct Scsi_Host *shost;
2893         struct iscsi_bus_flash_session *fnode_sess;
2894         uint32_t *idx;
2895         int err = 0;
2896
2897         if (!transport->del_flashnode) {
2898                 err = -ENOSYS;
2899                 goto exit_del_fnode;
2900         }
2901
2902         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
2903         if (!shost) {
2904                 pr_err("%s could not find host no %u\n",
2905                        __func__, ev->u.del_flashnode.host_no);
2906                 err = -ENODEV;
2907                 goto put_host;
2908         }
2909
2910         idx = &ev->u.del_flashnode.flashnode_idx;
2911         fnode_sess = iscsi_get_flashnode_by_index(shost, idx,
2912                                                   flashnode_match_index);
2913         if (!fnode_sess) {
2914                 pr_err("%s could not find flashnode %u for host no %u\n",
2915                        __func__, *idx, ev->u.del_flashnode.host_no);
2916                 err = -ENODEV;
2917                 goto put_host;
2918         }
2919
2920         err = transport->del_flashnode(fnode_sess);
2921
2922 put_host:
2923         scsi_host_put(shost);
2924
2925 exit_del_fnode:
2926         return err;
2927 }
2928
2929 static int iscsi_login_flashnode(struct iscsi_transport *transport,
2930                                  struct iscsi_uevent *ev)
2931 {
2932         struct Scsi_Host *shost;
2933         struct iscsi_bus_flash_session *fnode_sess;
2934         struct iscsi_bus_flash_conn *fnode_conn;
2935         struct device *dev;
2936         uint32_t *idx;
2937         int err = 0;
2938
2939         if (!transport->login_flashnode) {
2940                 err = -ENOSYS;
2941                 goto exit_login_fnode;
2942         }
2943
2944         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
2945         if (!shost) {
2946                 pr_err("%s could not find host no %u\n",
2947                        __func__, ev->u.login_flashnode.host_no);
2948                 err = -ENODEV;
2949                 goto put_host;
2950         }
2951
2952         idx = &ev->u.login_flashnode.flashnode_idx;
2953         fnode_sess = iscsi_get_flashnode_by_index(shost, idx,
2954                                                   flashnode_match_index);
2955         if (!fnode_sess) {
2956                 pr_err("%s could not find flashnode %u for host no %u\n",
2957                        __func__, *idx, ev->u.login_flashnode.host_no);
2958                 err = -ENODEV;
2959                 goto put_host;
2960         }
2961
2962         dev = iscsi_find_flashnode_conn(fnode_sess, NULL,
2963                                         iscsi_is_flashnode_conn_dev);
2964         if (!dev) {
2965                 err = -ENODEV;
2966                 goto put_host;
2967         }
2968
2969         fnode_conn = iscsi_dev_to_flash_conn(dev);
2970         err = transport->login_flashnode(fnode_sess, fnode_conn);
2971
2972 put_host:
2973         scsi_host_put(shost);
2974
2975 exit_login_fnode:
2976         return err;
2977 }
2978
2979 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
2980                                   struct iscsi_uevent *ev)
2981 {
2982         struct Scsi_Host *shost;
2983         struct iscsi_bus_flash_session *fnode_sess;
2984         struct iscsi_bus_flash_conn *fnode_conn;
2985         struct device *dev;
2986         uint32_t *idx;
2987         int err = 0;
2988
2989         if (!transport->logout_flashnode) {
2990                 err = -ENOSYS;
2991                 goto exit_logout_fnode;
2992         }
2993
2994         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
2995         if (!shost) {
2996                 pr_err("%s could not find host no %u\n",
2997                        __func__, ev->u.logout_flashnode.host_no);
2998                 err = -ENODEV;
2999                 goto put_host;
3000         }
3001
3002         idx = &ev->u.logout_flashnode.flashnode_idx;
3003         fnode_sess = iscsi_get_flashnode_by_index(shost, idx,
3004                                                   flashnode_match_index);
3005         if (!fnode_sess) {
3006                 pr_err("%s could not find flashnode %u for host no %u\n",
3007                        __func__, *idx, ev->u.logout_flashnode.host_no);
3008                 err = -ENODEV;
3009                 goto put_host;
3010         }
3011
3012         dev = iscsi_find_flashnode_conn(fnode_sess, NULL,
3013                                         iscsi_is_flashnode_conn_dev);
3014         if (!dev) {
3015                 err = -ENODEV;
3016                 goto put_host;
3017         }
3018
3019         fnode_conn = iscsi_dev_to_flash_conn(dev);
3020
3021         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3022
3023 put_host:
3024         scsi_host_put(shost);
3025
3026 exit_logout_fnode:
3027         return err;
3028 }
3029
3030 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3031                                       struct iscsi_uevent *ev)
3032 {
3033         struct Scsi_Host *shost;
3034         struct iscsi_cls_session *session;
3035         int err = 0;
3036
3037         if (!transport->logout_flashnode_sid) {
3038                 err = -ENOSYS;
3039                 goto exit_logout_sid;
3040         }
3041
3042         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3043         if (!shost) {
3044                 pr_err("%s could not find host no %u\n",
3045                        __func__, ev->u.logout_flashnode.host_no);
3046                 err = -ENODEV;
3047                 goto put_host;
3048         }
3049
3050         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3051         if (!session) {
3052                 pr_err("%s could not find session id %u\n",
3053                        __func__, ev->u.logout_flashnode_sid.sid);
3054                 err = -EINVAL;
3055                 goto put_host;
3056         }
3057
3058         err = transport->logout_flashnode_sid(session);
3059
3060 put_host:
3061         scsi_host_put(shost);
3062
3063 exit_logout_sid:
3064         return err;
3065 }
3066
3067 static int
3068 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3069 {
3070         int err = 0;
3071         struct iscsi_uevent *ev = nlmsg_data(nlh);
3072         struct iscsi_transport *transport = NULL;
3073         struct iscsi_internal *priv;
3074         struct iscsi_cls_session *session;
3075         struct iscsi_cls_conn *conn;
3076         struct iscsi_endpoint *ep = NULL;
3077
3078         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3079                 *group = ISCSI_NL_GRP_UIP;
3080         else
3081                 *group = ISCSI_NL_GRP_ISCSID;
3082
3083         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3084         if (!priv)
3085                 return -EINVAL;
3086         transport = priv->iscsi_transport;
3087
3088         if (!try_module_get(transport->owner))
3089                 return -EINVAL;
3090
3091         switch (nlh->nlmsg_type) {
3092         case ISCSI_UEVENT_CREATE_SESSION:
3093                 err = iscsi_if_create_session(priv, ep, ev,
3094                                               NETLINK_CB(skb).portid,
3095                                               ev->u.c_session.initial_cmdsn,
3096                                               ev->u.c_session.cmds_max,
3097                                               ev->u.c_session.queue_depth);
3098                 break;
3099         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3100                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3101                 if (!ep) {
3102                         err = -EINVAL;
3103                         break;
3104                 }
3105
3106                 err = iscsi_if_create_session(priv, ep, ev,
3107                                         NETLINK_CB(skb).portid,
3108                                         ev->u.c_bound_session.initial_cmdsn,
3109                                         ev->u.c_bound_session.cmds_max,
3110                                         ev->u.c_bound_session.queue_depth);
3111                 break;
3112         case ISCSI_UEVENT_DESTROY_SESSION:
3113                 session = iscsi_session_lookup(ev->u.d_session.sid);
3114                 if (session)
3115                         transport->destroy_session(session);
3116                 else
3117                         err = -EINVAL;
3118                 break;
3119         case ISCSI_UEVENT_UNBIND_SESSION:
3120                 session = iscsi_session_lookup(ev->u.d_session.sid);
3121                 if (session)
3122                         scsi_queue_work(iscsi_session_to_shost(session),
3123                                         &session->unbind_work);
3124                 else
3125                         err = -EINVAL;
3126                 break;
3127         case ISCSI_UEVENT_CREATE_CONN:
3128                 err = iscsi_if_create_conn(transport, ev);
3129                 break;
3130         case ISCSI_UEVENT_DESTROY_CONN:
3131                 err = iscsi_if_destroy_conn(transport, ev);
3132                 break;
3133         case ISCSI_UEVENT_BIND_CONN:
3134                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3135                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3136
3137                 if (conn && conn->ep)
3138                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3139
3140                 if (!session || !conn) {
3141                         err = -EINVAL;
3142                         break;
3143                 }
3144
3145                 ev->r.retcode = transport->bind_conn(session, conn,
3146                                                 ev->u.b_conn.transport_eph,
3147                                                 ev->u.b_conn.is_leading);
3148                 if (ev->r.retcode || !transport->ep_connect)
3149                         break;
3150
3151                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3152                 if (ep) {
3153                         ep->conn = conn;
3154
3155                         mutex_lock(&conn->ep_mutex);
3156                         conn->ep = ep;
3157                         mutex_unlock(&conn->ep_mutex);
3158                 } else
3159                         iscsi_cls_conn_printk(KERN_ERR, conn,
3160                                               "Could not set ep conn "
3161                                               "binding\n");
3162                 break;
3163         case ISCSI_UEVENT_SET_PARAM:
3164                 err = iscsi_set_param(transport, ev);
3165                 break;
3166         case ISCSI_UEVENT_START_CONN:
3167                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3168                 if (conn)
3169                         ev->r.retcode = transport->start_conn(conn);
3170                 else
3171                         err = -EINVAL;
3172                 break;
3173         case ISCSI_UEVENT_STOP_CONN:
3174                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3175                 if (conn)
3176                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3177                 else
3178                         err = -EINVAL;
3179                 break;
3180         case ISCSI_UEVENT_SEND_PDU:
3181                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3182                 if (conn)
3183                         ev->r.retcode = transport->send_pdu(conn,
3184                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3185                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3186                                 ev->u.send_pdu.data_size);
3187                 else
3188                         err = -EINVAL;
3189                 break;
3190         case ISCSI_UEVENT_GET_STATS:
3191                 err = iscsi_if_get_stats(transport, nlh);
3192                 break;
3193         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3194         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3195         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3196         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3197                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3198                 break;
3199         case ISCSI_UEVENT_TGT_DSCVR:
3200                 err = iscsi_tgt_dscvr(transport, ev);
3201                 break;
3202         case ISCSI_UEVENT_SET_HOST_PARAM:
3203                 err = iscsi_set_host_param(transport, ev);
3204                 break;
3205         case ISCSI_UEVENT_PATH_UPDATE:
3206                 err = iscsi_set_path(transport, ev);
3207                 break;
3208         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3209                 err = iscsi_set_iface_params(transport, ev,
3210                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3211                 break;
3212         case ISCSI_UEVENT_PING:
3213                 err = iscsi_send_ping(transport, ev);
3214                 break;
3215         case ISCSI_UEVENT_GET_CHAP:
3216                 err = iscsi_get_chap(transport, nlh);
3217                 break;
3218         case ISCSI_UEVENT_DELETE_CHAP:
3219                 err = iscsi_delete_chap(transport, ev);
3220                 break;
3221         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3222                 err = iscsi_set_flashnode_param(transport, ev,
3223                                                 nlmsg_attrlen(nlh,
3224                                                               sizeof(*ev)));
3225                 break;
3226         case ISCSI_UEVENT_NEW_FLASHNODE:
3227                 err = iscsi_new_flashnode(transport, ev,
3228                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3229                 break;
3230         case ISCSI_UEVENT_DEL_FLASHNODE:
3231                 err = iscsi_del_flashnode(transport, ev);
3232                 break;
3233         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3234                 err = iscsi_login_flashnode(transport, ev);
3235                 break;
3236         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3237                 err = iscsi_logout_flashnode(transport, ev);
3238                 break;
3239         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3240                 err = iscsi_logout_flashnode_sid(transport, ev);
3241                 break;
3242         default:
3243                 err = -ENOSYS;
3244                 break;
3245         }
3246
3247         module_put(transport->owner);
3248         return err;
3249 }
3250
3251 /*
3252  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3253  * Malformed skbs with wrong lengths or invalid creds are not processed.
3254  */
3255 static void
3256 iscsi_if_rx(struct sk_buff *skb)
3257 {
3258         mutex_lock(&rx_queue_mutex);
3259         while (skb->len >= NLMSG_HDRLEN) {
3260                 int err;
3261                 uint32_t rlen;
3262                 struct nlmsghdr *nlh;
3263                 struct iscsi_uevent *ev;
3264                 uint32_t group;
3265
3266                 nlh = nlmsg_hdr(skb);
3267                 if (nlh->nlmsg_len < sizeof(*nlh) ||
3268                     skb->len < nlh->nlmsg_len) {
3269                         break;
3270                 }
3271
3272                 ev = nlmsg_data(nlh);
3273                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3274                 if (rlen > skb->len)
3275                         rlen = skb->len;
3276
3277                 err = iscsi_if_recv_msg(skb, nlh, &group);
3278                 if (err) {
3279                         ev->type = ISCSI_KEVENT_IF_ERROR;
3280                         ev->iferror = err;
3281                 }
3282                 do {
3283                         /*
3284                          * special case for GET_STATS:
3285                          * on success - sending reply and stats from
3286                          * inside of if_recv_msg(),
3287                          * on error - fall through.
3288                          */
3289                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3290                                 break;
3291                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3292                                 break;
3293                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
3294                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
3295                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3296                 skb_pull(skb, rlen);
3297         }
3298         mutex_unlock(&rx_queue_mutex);
3299 }
3300
3301 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3302 struct device_attribute dev_attr_##_prefix##_##_name =  \
3303         __ATTR(_name,_mode,_show,_store)
3304
3305 /*
3306  * iSCSI connection attrs
3307  */
3308 #define iscsi_conn_attr_show(param)                                     \
3309 static ssize_t                                                          \
3310 show_conn_param_##param(struct device *dev,                             \
3311                         struct device_attribute *attr, char *buf)       \
3312 {                                                                       \
3313         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3314         struct iscsi_transport *t = conn->transport;                    \
3315         return t->get_conn_param(conn, param, buf);                     \
3316 }
3317
3318 #define iscsi_conn_attr(field, param)                                   \
3319         iscsi_conn_attr_show(param)                                     \
3320 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3321                         NULL);
3322
3323 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3324 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3325 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3326 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3327 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3328 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3329 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3330 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3331 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3332 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3333 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3334
3335 #define iscsi_conn_ep_attr_show(param)                                  \
3336 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3337                                           struct device_attribute *attr,\
3338                                           char *buf)                    \
3339 {                                                                       \
3340         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3341         struct iscsi_transport *t = conn->transport;                    \
3342         struct iscsi_endpoint *ep;                                      \
3343         ssize_t rc;                                                     \
3344                                                                         \
3345         /*                                                              \
3346          * Need to make sure ep_disconnect does not free the LLD's      \
3347          * interconnect resources while we are trying to read them.     \
3348          */                                                             \
3349         mutex_lock(&conn->ep_mutex);                                    \
3350         ep = conn->ep;                                                  \
3351         if (!ep && t->ep_connect) {                                     \
3352                 mutex_unlock(&conn->ep_mutex);                          \
3353                 return -ENOTCONN;                                       \
3354         }                                                               \
3355                                                                         \
3356         if (ep)                                                         \
3357                 rc = t->get_ep_param(ep, param, buf);                   \
3358         else                                                            \
3359                 rc = t->get_conn_param(conn, param, buf);               \
3360         mutex_unlock(&conn->ep_mutex);                                  \
3361         return rc;                                                      \
3362 }
3363
3364 #define iscsi_conn_ep_attr(field, param)                                \
3365         iscsi_conn_ep_attr_show(param)                                  \
3366 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3367                         show_conn_ep_param_##param, NULL);
3368
3369 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3370 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3371
3372 static struct attribute *iscsi_conn_attrs[] = {
3373         &dev_attr_conn_max_recv_dlength.attr,
3374         &dev_attr_conn_max_xmit_dlength.attr,
3375         &dev_attr_conn_header_digest.attr,
3376         &dev_attr_conn_data_digest.attr,
3377         &dev_attr_conn_ifmarker.attr,
3378         &dev_attr_conn_ofmarker.attr,
3379         &dev_attr_conn_address.attr,
3380         &dev_attr_conn_port.attr,
3381         &dev_attr_conn_exp_statsn.attr,
3382         &dev_attr_conn_persistent_address.attr,
3383         &dev_attr_conn_persistent_port.attr,
3384         &dev_attr_conn_ping_tmo.attr,
3385         &dev_attr_conn_recv_tmo.attr,
3386         NULL,
3387 };
3388
3389 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3390                                          struct attribute *attr, int i)
3391 {
3392         struct device *cdev = container_of(kobj, struct device, kobj);
3393         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3394         struct iscsi_transport *t = conn->transport;
3395         int param;
3396
3397         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3398                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3399         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3400                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3401         else if (attr == &dev_attr_conn_header_digest.attr)
3402                 param = ISCSI_PARAM_HDRDGST_EN;
3403         else if (attr == &dev_attr_conn_data_digest.attr)
3404                 param = ISCSI_PARAM_DATADGST_EN;
3405         else if (attr == &dev_attr_conn_ifmarker.attr)
3406                 param = ISCSI_PARAM_IFMARKER_EN;
3407         else if (attr == &dev_attr_conn_ofmarker.attr)
3408                 param = ISCSI_PARAM_OFMARKER_EN;
3409         else if (attr == &dev_attr_conn_address.attr)
3410                 param = ISCSI_PARAM_CONN_ADDRESS;
3411         else if (attr == &dev_attr_conn_port.attr)
3412                 param = ISCSI_PARAM_CONN_PORT;
3413         else if (attr == &dev_attr_conn_exp_statsn.attr)
3414                 param = ISCSI_PARAM_EXP_STATSN;
3415         else if (attr == &dev_attr_conn_persistent_address.attr)
3416                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3417         else if (attr == &dev_attr_conn_persistent_port.attr)
3418                 param = ISCSI_PARAM_PERSISTENT_PORT;
3419         else if (attr == &dev_attr_conn_ping_tmo.attr)
3420                 param = ISCSI_PARAM_PING_TMO;
3421         else if (attr == &dev_attr_conn_recv_tmo.attr)
3422                 param = ISCSI_PARAM_RECV_TMO;
3423         else {
3424                 WARN_ONCE(1, "Invalid conn attr");
3425                 return 0;
3426         }
3427
3428         return t->attr_is_visible(ISCSI_PARAM, param);
3429 }
3430
3431 static struct attribute_group iscsi_conn_group = {
3432         .attrs = iscsi_conn_attrs,
3433         .is_visible = iscsi_conn_attr_is_visible,
3434 };
3435
3436 /*
3437  * iSCSI session attrs
3438  */
3439 #define iscsi_session_attr_show(param, perm)                            \
3440 static ssize_t                                                          \
3441 show_session_param_##param(struct device *dev,                          \
3442                            struct device_attribute *attr, char *buf)    \
3443 {                                                                       \
3444         struct iscsi_cls_session *session =                             \
3445                 iscsi_dev_to_session(dev->parent);                      \
3446         struct iscsi_transport *t = session->transport;                 \
3447                                                                         \
3448         if (perm && !capable(CAP_SYS_ADMIN))                            \
3449                 return -EACCES;                                         \
3450         return t->get_session_param(session, param, buf);               \
3451 }
3452
3453 #define iscsi_session_attr(field, param, perm)                          \
3454         iscsi_session_attr_show(param, perm)                            \
3455 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3456                         NULL);
3457 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3458 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3459 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3460 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3461 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3462 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3463 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3464 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3465 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3466 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3467 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3468 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3469 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3470 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3471 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3472 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3473 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3474 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3475 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3476 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3477 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3478 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3479 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3480
3481 static ssize_t
3482 show_priv_session_state(struct device *dev, struct device_attribute *attr,
3483                         char *buf)
3484 {
3485         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3486         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
3487 }
3488 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
3489                         NULL);
3490 static ssize_t
3491 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
3492                         char *buf)
3493 {
3494         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3495         return sprintf(buf, "%d\n", session->creator);
3496 }
3497 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
3498                         NULL);
3499 static ssize_t
3500 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
3501                             char *buf)
3502 {
3503         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3504         return sprintf(buf, "%d\n", session->target_id);
3505 }
3506 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
3507                         show_priv_session_target_id, NULL);
3508
3509 #define iscsi_priv_session_attr_show(field, format)                     \
3510 static ssize_t                                                          \
3511 show_priv_session_##field(struct device *dev,                           \
3512                           struct device_attribute *attr, char *buf)     \
3513 {                                                                       \
3514         struct iscsi_cls_session *session =                             \
3515                         iscsi_dev_to_session(dev->parent);              \
3516         if (session->field == -1)                                       \
3517                 return sprintf(buf, "off\n");                           \
3518         return sprintf(buf, format"\n", session->field);                \
3519 }
3520
3521 #define iscsi_priv_session_attr_store(field)                            \
3522 static ssize_t                                                          \
3523 store_priv_session_##field(struct device *dev,                          \
3524                            struct device_attribute *attr,               \
3525                            const char *buf, size_t count)               \
3526 {                                                                       \
3527         int val;                                                        \
3528         char *cp;                                                       \
3529         struct iscsi_cls_session *session =                             \
3530                 iscsi_dev_to_session(dev->parent);                      \
3531         if ((session->state == ISCSI_SESSION_FREE) ||                   \
3532             (session->state == ISCSI_SESSION_FAILED))                   \
3533                 return -EBUSY;                                          \
3534         if (strncmp(buf, "off", 3) == 0)                                \
3535                 session->field = -1;                                    \
3536         else {                                                          \
3537                 val = simple_strtoul(buf, &cp, 0);                      \
3538                 if (*cp != '\0' && *cp != '\n')                         \
3539                         return -EINVAL;                                 \
3540                 session->field = val;                                   \
3541         }                                                               \
3542         return count;                                                   \
3543 }
3544
3545 #define iscsi_priv_session_rw_attr(field, format)                       \
3546         iscsi_priv_session_attr_show(field, format)                     \
3547         iscsi_priv_session_attr_store(field)                            \
3548 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
3549                         show_priv_session_##field,                      \
3550                         store_priv_session_##field)
3551 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
3552
3553 static struct attribute *iscsi_session_attrs[] = {
3554         &dev_attr_sess_initial_r2t.attr,
3555         &dev_attr_sess_max_outstanding_r2t.attr,
3556         &dev_attr_sess_immediate_data.attr,
3557         &dev_attr_sess_first_burst_len.attr,
3558         &dev_attr_sess_max_burst_len.attr,
3559         &dev_attr_sess_data_pdu_in_order.attr,
3560         &dev_attr_sess_data_seq_in_order.attr,
3561         &dev_attr_sess_erl.attr,
3562         &dev_attr_sess_targetname.attr,
3563         &dev_attr_sess_tpgt.attr,
3564         &dev_attr_sess_password.attr,
3565         &dev_attr_sess_password_in.attr,
3566         &dev_attr_sess_username.attr,
3567         &dev_attr_sess_username_in.attr,
3568         &dev_attr_sess_fast_abort.attr,
3569         &dev_attr_sess_abort_tmo.attr,
3570         &dev_attr_sess_lu_reset_tmo.attr,
3571         &dev_attr_sess_tgt_reset_tmo.attr,
3572         &dev_attr_sess_ifacename.attr,
3573         &dev_attr_sess_initiatorname.attr,
3574         &dev_attr_sess_targetalias.attr,
3575         &dev_attr_priv_sess_recovery_tmo.attr,
3576         &dev_attr_priv_sess_state.attr,
3577         &dev_attr_priv_sess_creator.attr,
3578         &dev_attr_sess_chap_out_idx.attr,
3579         &dev_attr_sess_chap_in_idx.attr,
3580         &dev_attr_priv_sess_target_id.attr,
3581         NULL,
3582 };
3583
3584 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
3585                                             struct attribute *attr, int i)
3586 {
3587         struct device *cdev = container_of(kobj, struct device, kobj);
3588         struct iscsi_cls_session *session = transport_class_to_session(cdev);
3589         struct iscsi_transport *t = session->transport;
3590         int param;
3591
3592         if (attr == &dev_attr_sess_initial_r2t.attr)
3593                 param = ISCSI_PARAM_INITIAL_R2T_EN;
3594         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
3595                 param = ISCSI_PARAM_MAX_R2T;
3596         else if (attr == &dev_attr_sess_immediate_data.attr)
3597                 param = ISCSI_PARAM_IMM_DATA_EN;
3598         else if (attr == &dev_attr_sess_first_burst_len.attr)
3599                 param = ISCSI_PARAM_FIRST_BURST;
3600         else if (attr == &dev_attr_sess_max_burst_len.attr)
3601                 param = ISCSI_PARAM_MAX_BURST;
3602         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
3603                 param = ISCSI_PARAM_PDU_INORDER_EN;
3604         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
3605                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
3606         else if (attr == &dev_attr_sess_erl.attr)
3607                 param = ISCSI_PARAM_ERL;
3608         else if (attr == &dev_attr_sess_targetname.attr)
3609                 param = ISCSI_PARAM_TARGET_NAME;
3610         else if (attr == &dev_attr_sess_tpgt.attr)
3611                 param = ISCSI_PARAM_TPGT;
3612         else if (attr == &dev_attr_sess_chap_in_idx.attr)
3613                 param = ISCSI_PARAM_CHAP_IN_IDX;
3614         else if (attr == &dev_attr_sess_chap_out_idx.attr)
3615                 param = ISCSI_PARAM_CHAP_OUT_IDX;
3616         else if (attr == &dev_attr_sess_password.attr)
3617                 param = ISCSI_PARAM_USERNAME;
3618         else if (attr == &dev_attr_sess_password_in.attr)
3619                 param = ISCSI_PARAM_USERNAME_IN;
3620         else if (attr == &dev_attr_sess_username.attr)
3621                 param = ISCSI_PARAM_PASSWORD;
3622         else if (attr == &dev_attr_sess_username_in.attr)
3623                 param = ISCSI_PARAM_PASSWORD_IN;
3624         else if (attr == &dev_attr_sess_fast_abort.attr)
3625                 param = ISCSI_PARAM_FAST_ABORT;
3626         else if (attr == &dev_attr_sess_abort_tmo.attr)
3627                 param = ISCSI_PARAM_ABORT_TMO;
3628         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
3629                 param = ISCSI_PARAM_LU_RESET_TMO;
3630         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
3631                 param = ISCSI_PARAM_TGT_RESET_TMO;
3632         else if (attr == &dev_attr_sess_ifacename.attr)
3633                 param = ISCSI_PARAM_IFACE_NAME;
3634         else if (attr == &dev_attr_sess_initiatorname.attr)
3635                 param = ISCSI_PARAM_INITIATOR_NAME;
3636         else if (attr == &dev_attr_sess_targetalias.attr)
3637                 param = ISCSI_PARAM_TARGET_ALIAS;
3638         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
3639                 return S_IRUGO | S_IWUSR;
3640         else if (attr == &dev_attr_priv_sess_state.attr)
3641                 return S_IRUGO;
3642         else if (attr == &dev_attr_priv_sess_creator.attr)
3643                 return S_IRUGO;
3644         else if (attr == &dev_attr_priv_sess_target_id.attr)
3645                 return S_IRUGO;
3646         else {
3647                 WARN_ONCE(1, "Invalid session attr");
3648                 return 0;
3649         }
3650
3651         return t->attr_is_visible(ISCSI_PARAM, param);
3652 }
3653
3654 static struct attribute_group iscsi_session_group = {
3655         .attrs = iscsi_session_attrs,
3656         .is_visible = iscsi_session_attr_is_visible,
3657 };
3658
3659 /*
3660  * iSCSI host attrs
3661  */
3662 #define iscsi_host_attr_show(param)                                     \
3663 static ssize_t                                                          \
3664 show_host_param_##param(struct device *dev,                             \
3665                         struct device_attribute *attr, char *buf)       \
3666 {                                                                       \
3667         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
3668         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
3669         return priv->iscsi_transport->get_host_param(shost, param, buf); \
3670 }
3671
3672 #define iscsi_host_attr(field, param)                                   \
3673         iscsi_host_attr_show(param)                                     \
3674 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
3675                         NULL);
3676
3677 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
3678 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
3679 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
3680 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
3681 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
3682 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
3683
3684 static struct attribute *iscsi_host_attrs[] = {
3685         &dev_attr_host_netdev.attr,
3686         &dev_attr_host_hwaddress.attr,
3687         &dev_attr_host_ipaddress.attr,
3688         &dev_attr_host_initiatorname.attr,
3689         &dev_attr_host_port_state.attr,
3690         &dev_attr_host_port_speed.attr,
3691         NULL,
3692 };
3693
3694 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
3695                                          struct attribute *attr, int i)
3696 {
3697         struct device *cdev = container_of(kobj, struct device, kobj);
3698         struct Scsi_Host *shost = transport_class_to_shost(cdev);
3699         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
3700         int param;
3701
3702         if (attr == &dev_attr_host_netdev.attr)
3703                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
3704         else if (attr == &dev_attr_host_hwaddress.attr)
3705                 param = ISCSI_HOST_PARAM_HWADDRESS;
3706         else if (attr == &dev_attr_host_ipaddress.attr)
3707                 param = ISCSI_HOST_PARAM_IPADDRESS;
3708         else if (attr == &dev_attr_host_initiatorname.attr)
3709                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
3710         else if (attr == &dev_attr_host_port_state.attr)
3711                 param = ISCSI_HOST_PARAM_PORT_STATE;
3712         else if (attr == &dev_attr_host_port_speed.attr)
3713                 param = ISCSI_HOST_PARAM_PORT_SPEED;
3714         else {
3715                 WARN_ONCE(1, "Invalid host attr");
3716                 return 0;
3717         }
3718
3719         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
3720 }
3721
3722 static struct attribute_group iscsi_host_group = {
3723         .attrs = iscsi_host_attrs,
3724         .is_visible = iscsi_host_attr_is_visible,
3725 };
3726
3727 /* convert iscsi_port_speed values to ascii string name */
3728 static const struct {
3729         enum iscsi_port_speed   value;
3730         char                    *name;
3731 } iscsi_port_speed_names[] = {
3732         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
3733         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
3734         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
3735         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
3736         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
3737 };
3738
3739 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
3740 {
3741         int i;
3742         char *speed = "Unknown!";
3743         struct iscsi_cls_host *ihost = shost->shost_data;
3744         uint32_t port_speed = ihost->port_speed;
3745
3746         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
3747                 if (iscsi_port_speed_names[i].value & port_speed) {
3748                         speed = iscsi_port_speed_names[i].name;
3749                         break;
3750                 }
3751         }
3752         return speed;
3753 }
3754 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
3755
3756 /* convert iscsi_port_state values to ascii string name */
3757 static const struct {
3758         enum iscsi_port_state   value;
3759         char                    *name;
3760 } iscsi_port_state_names[] = {
3761         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
3762         {ISCSI_PORT_STATE_UP,           "LINK UP" },
3763 };
3764
3765 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
3766 {
3767         int i;
3768         char *state = "Unknown!";
3769         struct iscsi_cls_host *ihost = shost->shost_data;
3770         uint32_t port_state = ihost->port_state;
3771
3772         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
3773                 if (iscsi_port_state_names[i].value & port_state) {
3774                         state = iscsi_port_state_names[i].name;
3775                         break;
3776                 }
3777         }
3778         return state;
3779 }
3780 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
3781
3782 static int iscsi_session_match(struct attribute_container *cont,
3783                            struct device *dev)
3784 {
3785         struct iscsi_cls_session *session;
3786         struct Scsi_Host *shost;
3787         struct iscsi_internal *priv;
3788
3789         if (!iscsi_is_session_dev(dev))
3790                 return 0;
3791
3792         session = iscsi_dev_to_session(dev);
3793         shost = iscsi_session_to_shost(session);
3794         if (!shost->transportt)
3795                 return 0;
3796
3797         priv = to_iscsi_internal(shost->transportt);
3798         if (priv->session_cont.ac.class != &iscsi_session_class.class)
3799                 return 0;
3800
3801         return &priv->session_cont.ac == cont;
3802 }
3803
3804 static int iscsi_conn_match(struct attribute_container *cont,
3805                            struct device *dev)
3806 {
3807         struct iscsi_cls_session *session;
3808         struct iscsi_cls_conn *conn;
3809         struct Scsi_Host *shost;
3810         struct iscsi_internal *priv;
3811
3812         if (!iscsi_is_conn_dev(dev))
3813                 return 0;
3814
3815         conn = iscsi_dev_to_conn(dev);
3816         session = iscsi_dev_to_session(conn->dev.parent);
3817         shost = iscsi_session_to_shost(session);
3818
3819         if (!shost->transportt)
3820                 return 0;
3821
3822         priv = to_iscsi_internal(shost->transportt);
3823         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
3824                 return 0;
3825
3826         return &priv->conn_cont.ac == cont;
3827 }
3828
3829 static int iscsi_host_match(struct attribute_container *cont,
3830                             struct device *dev)
3831 {
3832         struct Scsi_Host *shost;
3833         struct iscsi_internal *priv;
3834
3835         if (!scsi_is_host_device(dev))
3836                 return 0;
3837
3838         shost = dev_to_shost(dev);
3839         if (!shost->transportt  ||
3840             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
3841                 return 0;
3842
3843         priv = to_iscsi_internal(shost->transportt);
3844         return &priv->t.host_attrs.ac == cont;
3845 }
3846
3847 struct scsi_transport_template *
3848 iscsi_register_transport(struct iscsi_transport *tt)
3849 {
3850         struct iscsi_internal *priv;
3851         unsigned long flags;
3852         int err;
3853
3854         BUG_ON(!tt);
3855
3856         priv = iscsi_if_transport_lookup(tt);
3857         if (priv)
3858                 return NULL;
3859
3860         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
3861         if (!priv)
3862                 return NULL;
3863         INIT_LIST_HEAD(&priv->list);
3864         priv->iscsi_transport = tt;
3865         priv->t.user_scan = iscsi_user_scan;
3866         priv->t.create_work_queue = 1;
3867
3868         priv->dev.class = &iscsi_transport_class;
3869         dev_set_name(&priv->dev, "%s", tt->name);
3870         err = device_register(&priv->dev);
3871         if (err)
3872                 goto free_priv;
3873
3874         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
3875         if (err)
3876                 goto unregister_dev;
3877
3878         /* host parameters */
3879         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
3880         priv->t.host_attrs.ac.match = iscsi_host_match;
3881         priv->t.host_attrs.ac.grp = &iscsi_host_group;
3882         priv->t.host_size = sizeof(struct iscsi_cls_host);
3883         transport_container_register(&priv->t.host_attrs);
3884
3885         /* connection parameters */
3886         priv->conn_cont.ac.class = &iscsi_connection_class.class;
3887         priv->conn_cont.ac.match = iscsi_conn_match;
3888         priv->conn_cont.ac.grp = &iscsi_conn_group;
3889         transport_container_register(&priv->conn_cont);
3890
3891         /* session parameters */
3892         priv->session_cont.ac.class = &iscsi_session_class.class;
3893         priv->session_cont.ac.match = iscsi_session_match;
3894         priv->session_cont.ac.grp = &iscsi_session_group;
3895         transport_container_register(&priv->session_cont);
3896
3897         spin_lock_irqsave(&iscsi_transport_lock, flags);
3898         list_add(&priv->list, &iscsi_transports);
3899         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
3900
3901         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
3902         return &priv->t;
3903
3904 unregister_dev:
3905         device_unregister(&priv->dev);
3906         return NULL;
3907 free_priv:
3908         kfree(priv);
3909         return NULL;
3910 }
3911 EXPORT_SYMBOL_GPL(iscsi_register_transport);
3912
3913 int iscsi_unregister_transport(struct iscsi_transport *tt)
3914 {
3915         struct iscsi_internal *priv;
3916         unsigned long flags;
3917
3918         BUG_ON(!tt);
3919
3920         mutex_lock(&rx_queue_mutex);
3921
3922         priv = iscsi_if_transport_lookup(tt);
3923         BUG_ON (!priv);
3924
3925         spin_lock_irqsave(&iscsi_transport_lock, flags);
3926         list_del(&priv->list);
3927         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
3928
3929         transport_container_unregister(&priv->conn_cont);
3930         transport_container_unregister(&priv->session_cont);
3931         transport_container_unregister(&priv->t.host_attrs);
3932
3933         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
3934         device_unregister(&priv->dev);
3935         mutex_unlock(&rx_queue_mutex);
3936
3937         return 0;
3938 }
3939 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
3940
3941 static __init int iscsi_transport_init(void)
3942 {
3943         int err;
3944         struct netlink_kernel_cfg cfg = {
3945                 .groups = 1,
3946                 .input  = iscsi_if_rx,
3947         };
3948         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
3949                 ISCSI_TRANSPORT_VERSION);
3950
3951         atomic_set(&iscsi_session_nr, 0);
3952
3953         err = class_register(&iscsi_transport_class);
3954         if (err)
3955                 return err;
3956
3957         err = class_register(&iscsi_endpoint_class);
3958         if (err)
3959                 goto unregister_transport_class;
3960
3961         err = class_register(&iscsi_iface_class);
3962         if (err)
3963                 goto unregister_endpoint_class;
3964
3965         err = transport_class_register(&iscsi_host_class);
3966         if (err)
3967                 goto unregister_iface_class;
3968
3969         err = transport_class_register(&iscsi_connection_class);
3970         if (err)
3971                 goto unregister_host_class;
3972
3973         err = transport_class_register(&iscsi_session_class);
3974         if (err)
3975                 goto unregister_conn_class;
3976
3977         err = bus_register(&iscsi_flashnode_bus);
3978         if (err)
3979                 goto unregister_session_class;
3980
3981         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
3982         if (!nls) {
3983                 err = -ENOBUFS;
3984                 goto unregister_flashnode_bus;
3985         }
3986
3987         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
3988         if (!iscsi_eh_timer_workq)
3989                 goto release_nls;
3990
3991         return 0;
3992
3993 release_nls:
3994         netlink_kernel_release(nls);
3995 unregister_flashnode_bus:
3996         bus_unregister(&iscsi_flashnode_bus);
3997 unregister_session_class:
3998         transport_class_unregister(&iscsi_session_class);
3999 unregister_conn_class:
4000         transport_class_unregister(&iscsi_connection_class);
4001 unregister_host_class:
4002         transport_class_unregister(&iscsi_host_class);
4003 unregister_iface_class:
4004         class_unregister(&iscsi_iface_class);
4005 unregister_endpoint_class:
4006         class_unregister(&iscsi_endpoint_class);
4007 unregister_transport_class:
4008         class_unregister(&iscsi_transport_class);
4009         return err;
4010 }
4011
4012 static void __exit iscsi_transport_exit(void)
4013 {
4014         destroy_workqueue(iscsi_eh_timer_workq);
4015         netlink_kernel_release(nls);
4016         bus_unregister(&iscsi_flashnode_bus);
4017         transport_class_unregister(&iscsi_connection_class);
4018         transport_class_unregister(&iscsi_session_class);
4019         transport_class_unregister(&iscsi_host_class);
4020         class_unregister(&iscsi_endpoint_class);
4021         class_unregister(&iscsi_iface_class);
4022         class_unregister(&iscsi_transport_class);
4023 }
4024
4025 module_init(iscsi_transport_init);
4026 module_exit(iscsi_transport_exit);
4027
4028 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4029               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4030               "Alex Aizman <itn780@yahoo.com>");
4031 MODULE_DESCRIPTION("iSCSI Transport Interface");
4032 MODULE_LICENSE("GPL");
4033 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4034 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);