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 <net/tcp.h>
  28 #include <scsi/scsi.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_transport.h>
  32 #include <scsi/scsi_transport_iscsi.h>
  33 #include <scsi/iscsi_if.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include <scsi/scsi_bsg_iscsi.h>
  36
  37 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  38
  39 static int dbg_session;
  40 module_param_named(debug_session, dbg_session, int,
  41                    S_IRUGO | S_IWUSR);
  42 MODULE_PARM_DESC(debug_session,
  43                  "Turn on debugging for sessions in scsi_transport_iscsi "
  44                  "module. Set to 1 to turn on, and zero to turn off. Default "
  45                  "is off.");
  46
  47 static int dbg_conn;
  48 module_param_named(debug_conn, dbg_conn, int,
  49                    S_IRUGO | S_IWUSR);
  50 MODULE_PARM_DESC(debug_conn,
  51                  "Turn on debugging for connections in scsi_transport_iscsi "
  52                  "module. Set to 1 to turn on, and zero to turn off. Default "
  53                  "is off.");
  54
  55 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  56         do {                                                            \
  57                 if (dbg_session)                                        \
  58                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  59                                                  "%s: " dbg_fmt,        \
  60                                                  __func__, ##arg);      \
  61         } while (0);
  62
  63 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  64         do {                                                            \
  65                 if (dbg_conn)                                           \
  66                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  67                                               "%s: " dbg_fmt,           \
  68                                               __func__, ##arg); \
  69         } while (0);
  70
  71 struct iscsi_internal {
  72         struct scsi_transport_template t;
  73         struct iscsi_transport *iscsi_transport;
  74         struct list_head list;
  75         struct device dev;
  76
  77         struct transport_container conn_cont;
  78         struct transport_container session_cont;
  79 };
  80
  81 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  82 static struct workqueue_struct *iscsi_eh_timer_workq;
  83
  84 /*
  85  * list of registered transports and lock that must
  86  * be held while accessing list. The iscsi_transport_lock must
  87  * be acquired after the rx_queue_mutex.
  88  */
  89 static LIST_HEAD(iscsi_transports);
  90 static DEFINE_SPINLOCK(iscsi_transport_lock);
  91
  92 #define to_iscsi_internal(tmpl) \
  93         container_of(tmpl, struct iscsi_internal, t)
  94
  95 #define dev_to_iscsi_internal(_dev) \
  96         container_of(_dev, struct iscsi_internal, dev)
  97
  98 static void iscsi_transport_release(struct device *dev)
  99 {
 100         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 101         kfree(priv);
 102 }
 103
 104 /*
 105  * iscsi_transport_class represents the iscsi_transports that are
 106  * registered.
 107  */
 108 static struct class iscsi_transport_class = {
 109         .name = "iscsi_transport",
 110         .dev_release = iscsi_transport_release,
 111 };
 112
 113 static ssize_t
 114 show_transport_handle(struct device *dev, struct device_attribute *attr,
 115                       char *buf)
 116 {
 117         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 118         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 119 }
 120 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 121
 122 #define show_transport_attr(name, format)                               \
 123 static ssize_t                                                          \
 124 show_transport_##name(struct device *dev,                               \
 125                       struct device_attribute *attr,char *buf)          \
 126 {                                                                       \
 127         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 128         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 129 }                                                                       \
 130 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 131
 132 show_transport_attr(caps, "0x%x");
 133
 134 static struct attribute *iscsi_transport_attrs[] = {
 135         &dev_attr_handle.attr,
 136         &dev_attr_caps.attr,
 137         NULL,
 138 };
 139
 140 static struct attribute_group iscsi_transport_group = {
 141         .attrs = iscsi_transport_attrs,
 142 };
 143
 144 /*
 145  * iSCSI endpoint attrs
 146  */
 147 #define iscsi_dev_to_endpoint(_dev) \
 148         container_of(_dev, struct iscsi_endpoint, dev)
 149
 150 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 151 struct device_attribute dev_attr_##_prefix##_##_name =  \
 152         __ATTR(_name,_mode,_show,_store)
 153
 154 static void iscsi_endpoint_release(struct device *dev)
 155 {
 156         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 157         kfree(ep);
 158 }
 159
 160 static struct class iscsi_endpoint_class = {
 161         .name = "iscsi_endpoint",
 162         .dev_release = iscsi_endpoint_release,
 163 };
 164
 165 static ssize_t
 166 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 167 {
 168         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 169         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 170 }
 171 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 172
 173 static struct attribute *iscsi_endpoint_attrs[] = {
 174         &dev_attr_ep_handle.attr,
 175         NULL,
 176 };
 177
 178 static struct attribute_group iscsi_endpoint_group = {
 179         .attrs = iscsi_endpoint_attrs,
 180 };
 181
 182 #define ISCSI_MAX_EPID -1
 183
 184 static int iscsi_match_epid(struct device *dev, void *data)
 185 {
 186         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 187         uint64_t *epid = (uint64_t *) data;
 188
 189         return *epid == ep->id;
 190 }
 191
 192 struct iscsi_endpoint *
 193 iscsi_create_endpoint(int dd_size)
 194 {
 195         struct device *dev;
 196         struct iscsi_endpoint *ep;
 197         uint64_t id;
 198         int err;
 199
 200         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 201                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 202                                         iscsi_match_epid);
 203                 if (!dev)
 204                         break;
 205         }
 206         if (id == ISCSI_MAX_EPID) {
 207                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 208                        ISCSI_MAX_EPID - 1);
 209                 return NULL;
 210         }
 211
 212         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 213         if (!ep)
 214                 return NULL;
 215
 216         ep->id = id;
 217         ep->dev.class = &iscsi_endpoint_class;
 218         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 219         err = device_register(&ep->dev);
 220         if (err)
 221                 goto free_ep;
 222
 223         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 224         if (err)
 225                 goto unregister_dev;
 226
 227         if (dd_size)
 228                 ep->dd_data = &ep[1];
 229         return ep;
 230
 231 unregister_dev:
 232         device_unregister(&ep->dev);
 233         return NULL;
 234
 235 free_ep:
 236         kfree(ep);
 237         return NULL;
 238 }
 239 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 240
 241 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 242 {
 243         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 244         device_unregister(&ep->dev);
 245 }
 246 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 247
 248 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 249 {
 250         struct iscsi_endpoint *ep;
 251         struct device *dev;
 252
 253         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 254                                 iscsi_match_epid);
 255         if (!dev)
 256                 return NULL;
 257
 258         ep = iscsi_dev_to_endpoint(dev);
 259         /*
 260          * we can drop this now because the interface will prevent
 261          * removals and lookups from racing.
 262          */
 263         put_device(dev);
 264         return ep;
 265 }
 266 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 267
 268 /*
 269  * Interface to display network param to sysfs
 270  */
 271
 272 static void iscsi_iface_release(struct device *dev)
 273 {
 274         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 275         struct device *parent = iface->dev.parent;
 276
 277         kfree(iface);
 278         put_device(parent);
 279 }
 280
 281
 282 static struct class iscsi_iface_class = {
 283         .name = "iscsi_iface",
 284         .dev_release = iscsi_iface_release,
 285 };
 286
 287 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 288 struct device_attribute dev_attr_##_prefix##_##_name =          \
 289         __ATTR(_name, _mode, _show, _store)
 290
 291 /* iface attrs show */
 292 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 293 static ssize_t                                                          \
 294 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 295                      char *buf)                                         \
 296 {                                                                       \
 297         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 298         struct iscsi_transport *t = iface->transport;                   \
 299         return t->get_iface_param(iface, param_type, param, buf);       \
 300 }                                                                       \
 301
 302 #define iscsi_iface_net_attr(type, name, param)                         \
 303         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 304 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 305
 306 /* generic read only ipvi4 attribute */
 307 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 308 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 309 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 310 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 311
 312 /* generic read only ipv6 attribute */
 313 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 314 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 315 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 316 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 317                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 318 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
 319                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 320
 321 /* common read only iface attribute */
 322 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 323 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
 324 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 325 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 326 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 327
 328 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 329                                           struct attribute *attr, int i)
 330 {
 331         struct device *dev = container_of(kobj, struct device, kobj);
 332         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 333         struct iscsi_transport *t = iface->transport;
 334         int param;
 335
 336         if (attr == &dev_attr_iface_enabled.attr)
 337                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 338         else if (attr == &dev_attr_iface_vlan.attr)
 339                 param = ISCSI_NET_PARAM_VLAN_ID;
 340         else if (attr == &dev_attr_iface_vlan_priority.attr)
 341                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 342         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 343                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 344         else if (attr == &dev_attr_iface_mtu.attr)
 345                 param = ISCSI_NET_PARAM_MTU;
 346         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 347                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 348                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 349                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 350                         param = ISCSI_NET_PARAM_IPV4_GW;
 351                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 352                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 353                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 354                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 355                 else
 356                         return 0;
 357         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 358                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 359                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 360                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 361                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 362                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 363                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 364                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 365                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 366                 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
 367                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 368                 else
 369                         return 0;
 370         } else {
 371                 WARN_ONCE(1, "Invalid iface attr");
 372                 return 0;
 373         }
 374
 375         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 376 }
 377
 378 static struct attribute *iscsi_iface_attrs[] = {
 379         &dev_attr_iface_enabled.attr,
 380         &dev_attr_iface_vlan.attr,
 381         &dev_attr_iface_vlan_priority.attr,
 382         &dev_attr_iface_vlan_enabled.attr,
 383         &dev_attr_ipv4_iface_ipaddress.attr,
 384         &dev_attr_ipv4_iface_gateway.attr,
 385         &dev_attr_ipv4_iface_subnet.attr,
 386         &dev_attr_ipv4_iface_bootproto.attr,
 387         &dev_attr_ipv6_iface_ipaddress.attr,
 388         &dev_attr_ipv6_iface_link_local_addr.attr,
 389         &dev_attr_ipv6_iface_router_addr.attr,
 390         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 391         &dev_attr_ipv6_iface_linklocal_autocfg.attr,
 392         &dev_attr_iface_mtu.attr,
 393         NULL,
 394 };
 395
 396 static struct attribute_group iscsi_iface_group = {
 397         .attrs = iscsi_iface_attrs,
 398         .is_visible = iscsi_iface_attr_is_visible,
 399 };
 400
 401 struct iscsi_iface *
 402 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 403                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 404 {
 405         struct iscsi_iface *iface;
 406         int err;
 407
 408         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 409         if (!iface)
 410                 return NULL;
 411
 412         iface->transport = transport;
 413         iface->iface_type = iface_type;
 414         iface->iface_num = iface_num;
 415         iface->dev.release = iscsi_iface_release;
 416         iface->dev.class = &iscsi_iface_class;
 417         /* parent reference released in iscsi_iface_release */
 418         iface->dev.parent = get_device(&shost->shost_gendev);
 419         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 420                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 421                              iface_num);
 422         else
 423                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 424                              iface_num);
 425
 426         err = device_register(&iface->dev);
 427         if (err)
 428                 goto free_iface;
 429
 430         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 431         if (err)
 432                 goto unreg_iface;
 433
 434         if (dd_size)
 435                 iface->dd_data = &iface[1];
 436         return iface;
 437
 438 unreg_iface:
 439         device_unregister(&iface->dev);
 440         return NULL;
 441
 442 free_iface:
 443         put_device(iface->dev.parent);
 444         kfree(iface);
 445         return NULL;
 446 }
 447 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 448
 449 void iscsi_destroy_iface(struct iscsi_iface *iface)
 450 {
 451         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 452         device_unregister(&iface->dev);
 453 }
 454 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 455
 456 /*
 457  * BSG support
 458  */
 459 /**
 460  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
 461  * @job: bsg job to be processed
 462  */
 463 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
 464 {
 465         struct Scsi_Host *shost = iscsi_job_to_shost(job);
 466         struct iscsi_bsg_request *req = job->request;
 467         struct iscsi_bsg_reply *reply = job->reply;
 468         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 469         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
 470         int ret;
 471
 472         /* check if we have the msgcode value at least */
 473         if (job->request_len < sizeof(uint32_t)) {
 474                 ret = -ENOMSG;
 475                 goto fail_host_msg;
 476         }
 477
 478         /* Validate the host command */
 479         switch (req->msgcode) {
 480         case ISCSI_BSG_HST_VENDOR:
 481                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
 482                 if ((shost->hostt->vendor_id == 0L) ||
 483                     (req->rqst_data.h_vendor.vendor_id !=
 484                         shost->hostt->vendor_id)) {
 485                         ret = -ESRCH;
 486                         goto fail_host_msg;
 487                 }
 488                 break;
 489         default:
 490                 ret = -EBADR;
 491                 goto fail_host_msg;
 492         }
 493
 494         /* check if we really have all the request data needed */
 495         if (job->request_len < cmdlen) {
 496                 ret = -ENOMSG;
 497                 goto fail_host_msg;
 498         }
 499
 500         ret = i->iscsi_transport->bsg_request(job);
 501         if (!ret)
 502                 return 0;
 503
 504 fail_host_msg:
 505         /* return the errno failure code as the only status */
 506         BUG_ON(job->reply_len < sizeof(uint32_t));
 507         reply->reply_payload_rcv_len = 0;
 508         reply->result = ret;
 509         job->reply_len = sizeof(uint32_t);
 510         bsg_job_done(job, ret, 0);
 511         return 0;
 512 }
 513
 514 /**
 515  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
 516  * @shost: shost for iscsi_host
 517  * @cls_host: iscsi_cls_host adding the structures to
 518  */
 519 static int
 520 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
 521 {
 522         struct device *dev = &shost->shost_gendev;
 523         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 524         struct request_queue *q;
 525         char bsg_name[20];
 526         int ret;
 527
 528         if (!i->iscsi_transport->bsg_request)
 529                 return -ENOTSUPP;
 530
 531         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
 532
 533         q = __scsi_alloc_queue(shost, bsg_request_fn);
 534         if (!q)
 535                 return -ENOMEM;
 536
 537         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
 538         if (ret) {
 539                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
 540                              "initialize - no request queue\n");
 541                 blk_cleanup_queue(q);
 542                 return ret;
 543         }
 544
 545         ihost->bsg_q = q;
 546         return 0;
 547 }
 548
 549 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 550                             struct device *cdev)
 551 {
 552         struct Scsi_Host *shost = dev_to_shost(dev);
 553         struct iscsi_cls_host *ihost = shost->shost_data;
 554
 555         memset(ihost, 0, sizeof(*ihost));
 556         atomic_set(&ihost->nr_scans, 0);
 557         mutex_init(&ihost->mutex);
 558
 559         iscsi_bsg_host_add(shost, ihost);
 560         /* ignore any bsg add error - we just can't do sgio */
 561
 562         return 0;
 563 }
 564
 565 static int iscsi_remove_host(struct transport_container *tc,
 566                              struct device *dev, struct device *cdev)
 567 {
 568         struct Scsi_Host *shost = dev_to_shost(dev);
 569         struct iscsi_cls_host *ihost = shost->shost_data;
 570
 571         if (ihost->bsg_q) {
 572                 bsg_remove_queue(ihost->bsg_q);
 573                 blk_cleanup_queue(ihost->bsg_q);
 574         }
 575         return 0;
 576 }
 577
 578 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 579                                "iscsi_host",
 580                                iscsi_setup_host,
 581                                iscsi_remove_host,
 582                                NULL);
 583
 584 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 585                                "iscsi_session",
 586                                NULL,
 587                                NULL,
 588                                NULL);
 589
 590 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 591                                "iscsi_connection",
 592                                NULL,
 593                                NULL,
 594                                NULL);
 595
 596 static struct sock *nls;
 597 static DEFINE_MUTEX(rx_queue_mutex);
 598
 599 static LIST_HEAD(sesslist);
 600 static DEFINE_SPINLOCK(sesslock);
 601 static LIST_HEAD(connlist);
 602 static DEFINE_SPINLOCK(connlock);
 603
 604 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 605 {
 606         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 607         return sess->sid;
 608 }
 609
 610 /*
 611  * Returns the matching session to a given sid
 612  */
 613 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 614 {
 615         unsigned long flags;
 616         struct iscsi_cls_session *sess;
 617
 618         spin_lock_irqsave(&sesslock, flags);
 619         list_for_each_entry(sess, &sesslist, sess_list) {
 620                 if (sess->sid == sid) {
 621                         spin_unlock_irqrestore(&sesslock, flags);
 622                         return sess;
 623                 }
 624         }
 625         spin_unlock_irqrestore(&sesslock, flags);
 626         return NULL;
 627 }
 628
 629 /*
 630  * Returns the matching connection to a given sid / cid tuple
 631  */
 632 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 633 {
 634         unsigned long flags;
 635         struct iscsi_cls_conn *conn;
 636
 637         spin_lock_irqsave(&connlock, flags);
 638         list_for_each_entry(conn, &connlist, conn_list) {
 639                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 640                         spin_unlock_irqrestore(&connlock, flags);
 641                         return conn;
 642                 }
 643         }
 644         spin_unlock_irqrestore(&connlock, flags);
 645         return NULL;
 646 }
 647
 648 /*
 649  * The following functions can be used by LLDs that allocate
 650  * their own scsi_hosts or by software iscsi LLDs
 651  */
 652 static struct {
 653         int value;
 654         char *name;
 655 } iscsi_session_state_names[] = {
 656         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 657         { ISCSI_SESSION_FAILED,         "FAILED" },
 658         { ISCSI_SESSION_FREE,           "FREE" },
 659 };
 660
 661 static const char *iscsi_session_state_name(int state)
 662 {
 663         int i;
 664         char *name = NULL;
 665
 666         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 667                 if (iscsi_session_state_names[i].value == state) {
 668                         name = iscsi_session_state_names[i].name;
 669                         break;
 670                 }
 671         }
 672         return name;
 673 }
 674
 675 int iscsi_session_chkready(struct iscsi_cls_session *session)
 676 {
 677         unsigned long flags;
 678         int err;
 679
 680         spin_lock_irqsave(&session->lock, flags);
 681         switch (session->state) {
 682         case ISCSI_SESSION_LOGGED_IN:
 683                 err = 0;
 684                 break;
 685         case ISCSI_SESSION_FAILED:
 686                 err = DID_IMM_RETRY << 16;
 687                 break;
 688         case ISCSI_SESSION_FREE:
 689                 err = DID_TRANSPORT_FAILFAST << 16;
 690                 break;
 691         default:
 692                 err = DID_NO_CONNECT << 16;
 693                 break;
 694         }
 695         spin_unlock_irqrestore(&session->lock, flags);
 696         return err;
 697 }
 698 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 699
 700 int iscsi_is_session_online(struct iscsi_cls_session *session)
 701 {
 702         unsigned long flags;
 703         int ret = 0;
 704
 705         spin_lock_irqsave(&session->lock, flags);
 706         if (session->state == ISCSI_SESSION_LOGGED_IN)
 707                 ret = 1;
 708         spin_unlock_irqrestore(&session->lock, flags);
 709         return ret;
 710 }
 711 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
 712
 713 static void iscsi_session_release(struct device *dev)
 714 {
 715         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 716         struct Scsi_Host *shost;
 717
 718         shost = iscsi_session_to_shost(session);
 719         scsi_host_put(shost);
 720         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 721         kfree(session);
 722 }
 723
 724 static int iscsi_is_session_dev(const struct device *dev)
 725 {
 726         return dev->release == iscsi_session_release;
 727 }
 728
 729 static int iscsi_iter_session_fn(struct device *dev, void *data)
 730 {
 731         void (* fn) (struct iscsi_cls_session *) = data;
 732
 733         if (!iscsi_is_session_dev(dev))
 734                 return 0;
 735         fn(iscsi_dev_to_session(dev));
 736         return 0;
 737 }
 738
 739 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 740                                  void (*fn)(struct iscsi_cls_session *))
 741 {
 742         device_for_each_child(&shost->shost_gendev, fn,
 743                               iscsi_iter_session_fn);
 744 }
 745 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 746
 747 /**
 748  * iscsi_scan_finished - helper to report when running scans are done
 749  * @shost: scsi host
 750  * @time: scan run time
 751  *
 752  * This function can be used by drives like qla4xxx to report to the scsi
 753  * layer when the scans it kicked off at module load time are done.
 754  */
 755 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 756 {
 757         struct iscsi_cls_host *ihost = shost->shost_data;
 758         /*
 759          * qla4xxx will have kicked off some session unblocks before calling
 760          * scsi_scan_host, so just wait for them to complete.
 761          */
 762         return !atomic_read(&ihost->nr_scans);
 763 }
 764 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 765
 766 struct iscsi_scan_data {
 767         unsigned int channel;
 768         unsigned int id;
 769         unsigned int lun;
 770 };
 771
 772 static int iscsi_user_scan_session(struct device *dev, void *data)
 773 {
 774         struct iscsi_scan_data *scan_data = data;
 775         struct iscsi_cls_session *session;
 776         struct Scsi_Host *shost;
 777         struct iscsi_cls_host *ihost;
 778         unsigned long flags;
 779         unsigned int id;
 780
 781         if (!iscsi_is_session_dev(dev))
 782                 return 0;
 783
 784         session = iscsi_dev_to_session(dev);
 785
 786         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 787
 788         shost = iscsi_session_to_shost(session);
 789         ihost = shost->shost_data;
 790
 791         mutex_lock(&ihost->mutex);
 792         spin_lock_irqsave(&session->lock, flags);
 793         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 794                 spin_unlock_irqrestore(&session->lock, flags);
 795                 goto user_scan_exit;
 796         }
 797         id = session->target_id;
 798         spin_unlock_irqrestore(&session->lock, flags);
 799
 800         if (id != ISCSI_MAX_TARGET) {
 801                 if ((scan_data->channel == SCAN_WILD_CARD ||
 802                      scan_data->channel == 0) &&
 803                     (scan_data->id == SCAN_WILD_CARD ||
 804                      scan_data->id == id))
 805                         scsi_scan_target(&session->dev, 0, id,
 806                                          scan_data->lun, 1);
 807         }
 808
 809 user_scan_exit:
 810         mutex_unlock(&ihost->mutex);
 811         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 812         return 0;
 813 }
 814
 815 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 816                            uint id, uint lun)
 817 {
 818         struct iscsi_scan_data scan_data;
 819
 820         scan_data.channel = channel;
 821         scan_data.id = id;
 822         scan_data.lun = lun;
 823
 824         return device_for_each_child(&shost->shost_gendev, &scan_data,
 825                                      iscsi_user_scan_session);
 826 }
 827
 828 static void iscsi_scan_session(struct work_struct *work)
 829 {
 830         struct iscsi_cls_session *session =
 831                         container_of(work, struct iscsi_cls_session, scan_work);
 832         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 833         struct iscsi_cls_host *ihost = shost->shost_data;
 834         struct iscsi_scan_data scan_data;
 835
 836         scan_data.channel = 0;
 837         scan_data.id = SCAN_WILD_CARD;
 838         scan_data.lun = SCAN_WILD_CARD;
 839
 840         iscsi_user_scan_session(&session->dev, &scan_data);
 841         atomic_dec(&ihost->nr_scans);
 842 }
 843
 844 /**
 845  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 846  * @cmd: scsi cmd passed to scsi eh handler
 847  *
 848  * If the session is down this function will wait for the recovery
 849  * timer to fire or for the session to be logged back in. If the
 850  * recovery timer fires then FAST_IO_FAIL is returned. The caller
 851  * should pass this error value to the scsi eh.
 852  */
 853 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 854 {
 855         struct iscsi_cls_session *session =
 856                         starget_to_session(scsi_target(cmd->device));
 857         unsigned long flags;
 858         int ret = 0;
 859
 860         spin_lock_irqsave(&session->lock, flags);
 861         while (session->state != ISCSI_SESSION_LOGGED_IN) {
 862                 if (session->state == ISCSI_SESSION_FREE) {
 863                         ret = FAST_IO_FAIL;
 864                         break;
 865                 }
 866                 spin_unlock_irqrestore(&session->lock, flags);
 867                 msleep(1000);
 868                 spin_lock_irqsave(&session->lock, flags);
 869         }
 870         spin_unlock_irqrestore(&session->lock, flags);
 871         return ret;
 872 }
 873 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 874
 875 static void session_recovery_timedout(struct work_struct *work)
 876 {
 877         struct iscsi_cls_session *session =
 878                 container_of(work, struct iscsi_cls_session,
 879                              recovery_work.work);
 880         unsigned long flags;
 881
 882         iscsi_cls_session_printk(KERN_INFO, session,
 883                                  "session recovery timed out after %d secs\n",
 884                                  session->recovery_tmo);
 885
 886         spin_lock_irqsave(&session->lock, flags);
 887         switch (session->state) {
 888         case ISCSI_SESSION_FAILED:
 889                 session->state = ISCSI_SESSION_FREE;
 890                 break;
 891         case ISCSI_SESSION_LOGGED_IN:
 892         case ISCSI_SESSION_FREE:
 893                 /* we raced with the unblock's flush */
 894                 spin_unlock_irqrestore(&session->lock, flags);
 895                 return;
 896         }
 897         spin_unlock_irqrestore(&session->lock, flags);
 898
 899         if (session->transport->session_recovery_timedout)
 900                 session->transport->session_recovery_timedout(session);
 901
 902         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 903         scsi_target_unblock(&session->dev);
 904         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 905 }
 906
 907 static void __iscsi_unblock_session(struct work_struct *work)
 908 {
 909         struct iscsi_cls_session *session =
 910                         container_of(work, struct iscsi_cls_session,
 911                                      unblock_work);
 912         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 913         struct iscsi_cls_host *ihost = shost->shost_data;
 914         unsigned long flags;
 915
 916         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 917         /*
 918          * The recovery and unblock work get run from the same workqueue,
 919          * so try to cancel it if it was going to run after this unblock.
 920          */
 921         cancel_delayed_work(&session->recovery_work);
 922         spin_lock_irqsave(&session->lock, flags);
 923         session->state = ISCSI_SESSION_LOGGED_IN;
 924         spin_unlock_irqrestore(&session->lock, flags);
 925         /* start IO */
 926         scsi_target_unblock(&session->dev);
 927         /*
 928          * Only do kernel scanning if the driver is properly hooked into
 929          * the async scanning code (drivers like iscsi_tcp do login and
 930          * scanning from userspace).
 931          */
 932         if (shost->hostt->scan_finished) {
 933                 if (scsi_queue_work(shost, &session->scan_work))
 934                         atomic_inc(&ihost->nr_scans);
 935         }
 936         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 937 }
 938
 939 /**
 940  * iscsi_unblock_session - set a session as logged in and start IO.
 941  * @session: iscsi session
 942  *
 943  * Mark a session as ready to accept IO.
 944  */
 945 void iscsi_unblock_session(struct iscsi_cls_session *session)
 946 {
 947         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 948         /*
 949          * make sure all the events have completed before tell the driver
 950          * it is safe
 951          */
 952         flush_workqueue(iscsi_eh_timer_workq);
 953 }
 954 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 955
 956 static void __iscsi_block_session(struct work_struct *work)
 957 {
 958         struct iscsi_cls_session *session =
 959                         container_of(work, struct iscsi_cls_session,
 960                                      block_work);
 961         unsigned long flags;
 962
 963         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 964         spin_lock_irqsave(&session->lock, flags);
 965         session->state = ISCSI_SESSION_FAILED;
 966         spin_unlock_irqrestore(&session->lock, flags);
 967         scsi_target_block(&session->dev);
 968         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 969         if (session->recovery_tmo >= 0)
 970                 queue_delayed_work(iscsi_eh_timer_workq,
 971                                    &session->recovery_work,
 972                                    session->recovery_tmo * HZ);
 973 }
 974
 975 void iscsi_block_session(struct iscsi_cls_session *session)
 976 {
 977         queue_work(iscsi_eh_timer_workq, &session->block_work);
 978 }
 979 EXPORT_SYMBOL_GPL(iscsi_block_session);
 980
 981 static void __iscsi_unbind_session(struct work_struct *work)
 982 {
 983         struct iscsi_cls_session *session =
 984                         container_of(work, struct iscsi_cls_session,
 985                                      unbind_work);
 986         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 987         struct iscsi_cls_host *ihost = shost->shost_data;
 988         unsigned long flags;
 989
 990         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 991
 992         /* Prevent new scans and make sure scanning is not in progress */
 993         mutex_lock(&ihost->mutex);
 994         spin_lock_irqsave(&session->lock, flags);
 995         if (session->target_id == ISCSI_MAX_TARGET) {
 996                 spin_unlock_irqrestore(&session->lock, flags);
 997                 mutex_unlock(&ihost->mutex);
 998                 return;
 999         }
1000         session->target_id = ISCSI_MAX_TARGET;
1001         spin_unlock_irqrestore(&session->lock, flags);
1002         mutex_unlock(&ihost->mutex);
1003
1004         scsi_remove_target(&session->dev);
1005         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1006         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1007 }
1008
1009 struct iscsi_cls_session *
1010 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1011                     int dd_size)
1012 {
1013         struct iscsi_cls_session *session;
1014
1015         session = kzalloc(sizeof(*session) + dd_size,
1016                           GFP_KERNEL);
1017         if (!session)
1018                 return NULL;
1019
1020         session->transport = transport;
1021         session->recovery_tmo = 120;
1022         session->state = ISCSI_SESSION_FREE;
1023         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1024         INIT_LIST_HEAD(&session->sess_list);
1025         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1026         INIT_WORK(&session->block_work, __iscsi_block_session);
1027         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1028         INIT_WORK(&session->scan_work, iscsi_scan_session);
1029         spin_lock_init(&session->lock);
1030
1031         /* this is released in the dev's release function */
1032         scsi_host_get(shost);
1033         session->dev.parent = &shost->shost_gendev;
1034         session->dev.release = iscsi_session_release;
1035         device_initialize(&session->dev);
1036         if (dd_size)
1037                 session->dd_data = &session[1];
1038
1039         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1040         return session;
1041 }
1042 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1043
1044 static int iscsi_get_next_target_id(struct device *dev, void *data)
1045 {
1046         struct iscsi_cls_session *session;
1047         unsigned long flags;
1048         int err = 0;
1049
1050         if (!iscsi_is_session_dev(dev))
1051                 return 0;
1052
1053         session = iscsi_dev_to_session(dev);
1054         spin_lock_irqsave(&session->lock, flags);
1055         if (*((unsigned int *) data) == session->target_id)
1056                 err = -EEXIST;
1057         spin_unlock_irqrestore(&session->lock, flags);
1058         return err;
1059 }
1060
1061 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1062 {
1063         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1064         struct iscsi_cls_host *ihost;
1065         unsigned long flags;
1066         unsigned int id = target_id;
1067         int err;
1068
1069         ihost = shost->shost_data;
1070         session->sid = atomic_add_return(1, &iscsi_session_nr);
1071
1072         if (id == ISCSI_MAX_TARGET) {
1073                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
1074                         err = device_for_each_child(&shost->shost_gendev, &id,
1075                                                     iscsi_get_next_target_id);
1076                         if (!err)
1077                                 break;
1078                 }
1079
1080                 if (id == ISCSI_MAX_TARGET) {
1081                         iscsi_cls_session_printk(KERN_ERR, session,
1082                                                  "Too many iscsi targets. Max "
1083                                                  "number of targets is %d.\n",
1084                                                  ISCSI_MAX_TARGET - 1);
1085                         err = -EOVERFLOW;
1086                         goto release_host;
1087                 }
1088         }
1089         session->target_id = id;
1090
1091         dev_set_name(&session->dev, "session%u", session->sid);
1092         err = device_add(&session->dev);
1093         if (err) {
1094                 iscsi_cls_session_printk(KERN_ERR, session,
1095                                          "could not register session's dev\n");
1096                 goto release_host;
1097         }
1098         transport_register_device(&session->dev);
1099
1100         spin_lock_irqsave(&sesslock, flags);
1101         list_add(&session->sess_list, &sesslist);
1102         spin_unlock_irqrestore(&sesslock, flags);
1103
1104         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1105         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1106         return 0;
1107
1108 release_host:
1109         scsi_host_put(shost);
1110         return err;
1111 }
1112 EXPORT_SYMBOL_GPL(iscsi_add_session);
1113
1114 /**
1115  * iscsi_create_session - create iscsi class session
1116  * @shost: scsi host
1117  * @transport: iscsi transport
1118  * @dd_size: private driver data size
1119  * @target_id: which target
1120  *
1121  * This can be called from a LLD or iscsi_transport.
1122  */
1123 struct iscsi_cls_session *
1124 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1125                      int dd_size, unsigned int target_id)
1126 {
1127         struct iscsi_cls_session *session;
1128
1129         session = iscsi_alloc_session(shost, transport, dd_size);
1130         if (!session)
1131                 return NULL;
1132
1133         if (iscsi_add_session(session, target_id)) {
1134                 iscsi_free_session(session);
1135                 return NULL;
1136         }
1137         return session;
1138 }
1139 EXPORT_SYMBOL_GPL(iscsi_create_session);
1140
1141 static void iscsi_conn_release(struct device *dev)
1142 {
1143         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1144         struct device *parent = conn->dev.parent;
1145
1146         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1147         kfree(conn);
1148         put_device(parent);
1149 }
1150
1151 static int iscsi_is_conn_dev(const struct device *dev)
1152 {
1153         return dev->release == iscsi_conn_release;
1154 }
1155
1156 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1157 {
1158         if (!iscsi_is_conn_dev(dev))
1159                 return 0;
1160         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1161 }
1162
1163 void iscsi_remove_session(struct iscsi_cls_session *session)
1164 {
1165         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1166         unsigned long flags;
1167         int err;
1168
1169         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1170
1171         spin_lock_irqsave(&sesslock, flags);
1172         list_del(&session->sess_list);
1173         spin_unlock_irqrestore(&sesslock, flags);
1174
1175         /* make sure there are no blocks/unblocks queued */
1176         flush_workqueue(iscsi_eh_timer_workq);
1177         /* make sure the timedout callout is not running */
1178         if (!cancel_delayed_work(&session->recovery_work))
1179                 flush_workqueue(iscsi_eh_timer_workq);
1180         /*
1181          * If we are blocked let commands flow again. The lld or iscsi
1182          * layer should set up the queuecommand to fail commands.
1183          * We assume that LLD will not be calling block/unblock while
1184          * removing the session.
1185          */
1186         spin_lock_irqsave(&session->lock, flags);
1187         session->state = ISCSI_SESSION_FREE;
1188         spin_unlock_irqrestore(&session->lock, flags);
1189
1190         scsi_target_unblock(&session->dev);
1191         /* flush running scans then delete devices */
1192         scsi_flush_work(shost);
1193         __iscsi_unbind_session(&session->unbind_work);
1194
1195         /* hw iscsi may not have removed all connections from session */
1196         err = device_for_each_child(&session->dev, NULL,
1197                                     iscsi_iter_destroy_conn_fn);
1198         if (err)
1199                 iscsi_cls_session_printk(KERN_ERR, session,
1200                                          "Could not delete all connections "
1201                                          "for session. Error %d.\n", err);
1202
1203         transport_unregister_device(&session->dev);
1204
1205         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1206         device_del(&session->dev);
1207 }
1208 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1209
1210 void iscsi_free_session(struct iscsi_cls_session *session)
1211 {
1212         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1213         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1214         put_device(&session->dev);
1215 }
1216 EXPORT_SYMBOL_GPL(iscsi_free_session);
1217
1218 /**
1219  * iscsi_destroy_session - destroy iscsi session
1220  * @session: iscsi_session
1221  *
1222  * Can be called by a LLD or iscsi_transport. There must not be
1223  * any running connections.
1224  */
1225 int iscsi_destroy_session(struct iscsi_cls_session *session)
1226 {
1227         iscsi_remove_session(session);
1228         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1229         iscsi_free_session(session);
1230         return 0;
1231 }
1232 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1233
1234 /**
1235  * iscsi_create_conn - create iscsi class connection
1236  * @session: iscsi cls session
1237  * @dd_size: private driver data size
1238  * @cid: connection id
1239  *
1240  * This can be called from a LLD or iscsi_transport. The connection
1241  * is child of the session so cid must be unique for all connections
1242  * on the session.
1243  *
1244  * Since we do not support MCS, cid will normally be zero. In some cases
1245  * for software iscsi we could be trying to preallocate a connection struct
1246  * in which case there could be two connection structs and cid would be
1247  * non-zero.
1248  */
1249 struct iscsi_cls_conn *
1250 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1251 {
1252         struct iscsi_transport *transport = session->transport;
1253         struct iscsi_cls_conn *conn;
1254         unsigned long flags;
1255         int err;
1256
1257         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1258         if (!conn)
1259                 return NULL;
1260         if (dd_size)
1261                 conn->dd_data = &conn[1];
1262
1263         mutex_init(&conn->ep_mutex);
1264         INIT_LIST_HEAD(&conn->conn_list);
1265         conn->transport = transport;
1266         conn->cid = cid;
1267
1268         /* this is released in the dev's release function */
1269         if (!get_device(&session->dev))
1270                 goto free_conn;
1271
1272         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1273         conn->dev.parent = &session->dev;
1274         conn->dev.release = iscsi_conn_release;
1275         err = device_register(&conn->dev);
1276         if (err) {
1277                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1278                                          "register connection's dev\n");
1279                 goto release_parent_ref;
1280         }
1281         transport_register_device(&conn->dev);
1282
1283         spin_lock_irqsave(&connlock, flags);
1284         list_add(&conn->conn_list, &connlist);
1285         spin_unlock_irqrestore(&connlock, flags);
1286
1287         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1288         return conn;
1289
1290 release_parent_ref:
1291         put_device(&session->dev);
1292 free_conn:
1293         kfree(conn);
1294         return NULL;
1295 }
1296
1297 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1298
1299 /**
1300  * iscsi_destroy_conn - destroy iscsi class connection
1301  * @conn: iscsi cls session
1302  *
1303  * This can be called from a LLD or iscsi_transport.
1304  */
1305 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1306 {
1307         unsigned long flags;
1308
1309         spin_lock_irqsave(&connlock, flags);
1310         list_del(&conn->conn_list);
1311         spin_unlock_irqrestore(&connlock, flags);
1312
1313         transport_unregister_device(&conn->dev);
1314         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1315         device_unregister(&conn->dev);
1316         return 0;
1317 }
1318 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1319
1320 /*
1321  * iscsi interface functions
1322  */
1323 static struct iscsi_internal *
1324 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1325 {
1326         struct iscsi_internal *priv;
1327         unsigned long flags;
1328
1329         spin_lock_irqsave(&iscsi_transport_lock, flags);
1330         list_for_each_entry(priv, &iscsi_transports, list) {
1331                 if (tt == priv->iscsi_transport) {
1332                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1333                         return priv;
1334                 }
1335         }
1336         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1337         return NULL;
1338 }
1339
1340 static int
1341 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1342 {
1343         return nlmsg_multicast(nls, skb, 0, group, gfp);
1344 }
1345
1346 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1347                    char *data, uint32_t data_size)
1348 {
1349         struct nlmsghdr *nlh;
1350         struct sk_buff *skb;
1351         struct iscsi_uevent *ev;
1352         char *pdu;
1353         struct iscsi_internal *priv;
1354         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1355                               data_size);
1356
1357         priv = iscsi_if_transport_lookup(conn->transport);
1358         if (!priv)
1359                 return -EINVAL;
1360
1361         skb = alloc_skb(len, GFP_ATOMIC);
1362         if (!skb) {
1363                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1364                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1365                                       "control PDU: OOM\n");
1366                 return -ENOMEM;
1367         }
1368
1369         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1370         ev = NLMSG_DATA(nlh);
1371         memset(ev, 0, sizeof(*ev));
1372         ev->transport_handle = iscsi_handle(conn->transport);
1373         ev->type = ISCSI_KEVENT_RECV_PDU;
1374         ev->r.recv_req.cid = conn->cid;
1375         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1376         pdu = (char*)ev + sizeof(*ev);
1377         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1378         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1379
1380         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1381 }
1382 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1383
1384 int iscsi_offload_mesg(struct Scsi_Host *shost,
1385                        struct iscsi_transport *transport, uint32_t type,
1386                        char *data, uint16_t data_size)
1387 {
1388         struct nlmsghdr *nlh;
1389         struct sk_buff *skb;
1390         struct iscsi_uevent *ev;
1391         int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1392
1393         skb = alloc_skb(len, GFP_ATOMIC);
1394         if (!skb) {
1395                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1396                 return -ENOMEM;
1397         }
1398
1399         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1400         ev = NLMSG_DATA(nlh);
1401         memset(ev, 0, sizeof(*ev));
1402         ev->type = type;
1403         ev->transport_handle = iscsi_handle(transport);
1404         switch (type) {
1405         case ISCSI_KEVENT_PATH_REQ:
1406                 ev->r.req_path.host_no = shost->host_no;
1407                 break;
1408         case ISCSI_KEVENT_IF_DOWN:
1409                 ev->r.notify_if_down.host_no = shost->host_no;
1410                 break;
1411         }
1412
1413         memcpy((char *)ev + sizeof(*ev), data, data_size);
1414
1415         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1416 }
1417 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1418
1419 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1420 {
1421         struct nlmsghdr *nlh;
1422         struct sk_buff  *skb;
1423         struct iscsi_uevent *ev;
1424         struct iscsi_internal *priv;
1425         int len = NLMSG_SPACE(sizeof(*ev));
1426
1427         priv = iscsi_if_transport_lookup(conn->transport);
1428         if (!priv)
1429                 return;
1430
1431         skb = alloc_skb(len, GFP_ATOMIC);
1432         if (!skb) {
1433                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1434                                       "conn error (%d)\n", error);
1435                 return;
1436         }
1437
1438         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1439         ev = NLMSG_DATA(nlh);
1440         ev->transport_handle = iscsi_handle(conn->transport);
1441         ev->type = ISCSI_KEVENT_CONN_ERROR;
1442         ev->r.connerror.error = error;
1443         ev->r.connerror.cid = conn->cid;
1444         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1445
1446         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1447
1448         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1449                               error);
1450 }
1451 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1452
1453 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1454                             enum iscsi_conn_state state)
1455 {
1456         struct nlmsghdr *nlh;
1457         struct sk_buff  *skb;
1458         struct iscsi_uevent *ev;
1459         struct iscsi_internal *priv;
1460         int len = NLMSG_SPACE(sizeof(*ev));
1461
1462         priv = iscsi_if_transport_lookup(conn->transport);
1463         if (!priv)
1464                 return;
1465
1466         skb = alloc_skb(len, GFP_ATOMIC);
1467         if (!skb) {
1468                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1469                                       "conn login (%d)\n", state);
1470                 return;
1471         }
1472
1473         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1474         ev = NLMSG_DATA(nlh);
1475         ev->transport_handle = iscsi_handle(conn->transport);
1476         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1477         ev->r.conn_login.state = state;
1478         ev->r.conn_login.cid = conn->cid;
1479         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1480         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1481
1482         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1483                               state);
1484 }
1485 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1486
1487 static int
1488 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1489                     void *payload, int size)
1490 {
1491         struct sk_buff  *skb;
1492         struct nlmsghdr *nlh;
1493         int len = NLMSG_SPACE(size);
1494         int flags = multi ? NLM_F_MULTI : 0;
1495         int t = done ? NLMSG_DONE : type;
1496
1497         skb = alloc_skb(len, GFP_ATOMIC);
1498         if (!skb) {
1499                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1500                 return -ENOMEM;
1501         }
1502
1503         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1504         nlh->nlmsg_flags = flags;
1505         memcpy(NLMSG_DATA(nlh), payload, size);
1506         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1507 }
1508
1509 static int
1510 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1511 {
1512         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1513         struct iscsi_stats *stats;
1514         struct sk_buff *skbstat;
1515         struct iscsi_cls_conn *conn;
1516         struct nlmsghdr *nlhstat;
1517         struct iscsi_uevent *evstat;
1518         struct iscsi_internal *priv;
1519         int len = NLMSG_SPACE(sizeof(*ev) +
1520                               sizeof(struct iscsi_stats) +
1521                               sizeof(struct iscsi_stats_custom) *
1522                               ISCSI_STATS_CUSTOM_MAX);
1523         int err = 0;
1524
1525         priv = iscsi_if_transport_lookup(transport);
1526         if (!priv)
1527                 return -EINVAL;
1528
1529         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1530         if (!conn)
1531                 return -EEXIST;
1532
1533         do {
1534                 int actual_size;
1535
1536                 skbstat = alloc_skb(len, GFP_ATOMIC);
1537                 if (!skbstat) {
1538                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1539                                               "deliver stats: OOM\n");
1540                         return -ENOMEM;
1541                 }
1542
1543                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1544                                       (len - sizeof(*nlhstat)), 0);
1545                 evstat = NLMSG_DATA(nlhstat);
1546                 memset(evstat, 0, sizeof(*evstat));
1547                 evstat->transport_handle = iscsi_handle(conn->transport);
1548                 evstat->type = nlh->nlmsg_type;
1549                 evstat->u.get_stats.cid =
1550                         ev->u.get_stats.cid;
1551                 evstat->u.get_stats.sid =
1552                         ev->u.get_stats.sid;
1553                 stats = (struct iscsi_stats *)
1554                         ((char*)evstat + sizeof(*evstat));
1555                 memset(stats, 0, sizeof(*stats));
1556
1557                 transport->get_stats(conn, stats);
1558                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1559                                           sizeof(struct iscsi_stats) +
1560                                           sizeof(struct iscsi_stats_custom) *
1561                                           stats->custom_length);
1562                 actual_size -= sizeof(*nlhstat);
1563                 actual_size = NLMSG_LENGTH(actual_size);
1564                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1565                 nlhstat->nlmsg_len = actual_size;
1566
1567                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1568                                           GFP_ATOMIC);
1569         } while (err < 0 && err != -ECONNREFUSED);
1570
1571         return err;
1572 }
1573
1574 /**
1575  * iscsi_session_event - send session destr. completion event
1576  * @session: iscsi class session
1577  * @event: type of event
1578  */
1579 int iscsi_session_event(struct iscsi_cls_session *session,
1580                         enum iscsi_uevent_e event)
1581 {
1582         struct iscsi_internal *priv;
1583         struct Scsi_Host *shost;
1584         struct iscsi_uevent *ev;
1585         struct sk_buff  *skb;
1586         struct nlmsghdr *nlh;
1587         int rc, len = NLMSG_SPACE(sizeof(*ev));
1588
1589         priv = iscsi_if_transport_lookup(session->transport);
1590         if (!priv)
1591                 return -EINVAL;
1592         shost = iscsi_session_to_shost(session);
1593
1594         skb = alloc_skb(len, GFP_KERNEL);
1595         if (!skb) {
1596                 iscsi_cls_session_printk(KERN_ERR, session,
1597                                          "Cannot notify userspace of session "
1598                                          "event %u\n", event);
1599                 return -ENOMEM;
1600         }
1601
1602         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1603         ev = NLMSG_DATA(nlh);
1604         ev->transport_handle = iscsi_handle(session->transport);
1605
1606         ev->type = event;
1607         switch (event) {
1608         case ISCSI_KEVENT_DESTROY_SESSION:
1609                 ev->r.d_session.host_no = shost->host_no;
1610                 ev->r.d_session.sid = session->sid;
1611                 break;
1612         case ISCSI_KEVENT_CREATE_SESSION:
1613                 ev->r.c_session_ret.host_no = shost->host_no;
1614                 ev->r.c_session_ret.sid = session->sid;
1615                 break;
1616         case ISCSI_KEVENT_UNBIND_SESSION:
1617                 ev->r.unbind_session.host_no = shost->host_no;
1618                 ev->r.unbind_session.sid = session->sid;
1619                 break;
1620         default:
1621                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1622                                          "%u.\n", event);
1623                 kfree_skb(skb);
1624                 return -EINVAL;
1625         }
1626
1627         /*
1628          * this will occur if the daemon is not up, so we just warn
1629          * the user and when the daemon is restarted it will handle it
1630          */
1631         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1632         if (rc == -ESRCH)
1633                 iscsi_cls_session_printk(KERN_ERR, session,
1634                                          "Cannot notify userspace of session "
1635                                          "event %u. Check iscsi daemon\n",
1636                                          event);
1637
1638         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1639                                 event, rc);
1640         return rc;
1641 }
1642 EXPORT_SYMBOL_GPL(iscsi_session_event);
1643
1644 static int
1645 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1646                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1647                         uint16_t cmds_max, uint16_t queue_depth)
1648 {
1649         struct iscsi_transport *transport = priv->iscsi_transport;
1650         struct iscsi_cls_session *session;
1651         struct Scsi_Host *shost;
1652
1653         session = transport->create_session(ep, cmds_max, queue_depth,
1654                                             initial_cmdsn);
1655         if (!session)
1656                 return -ENOMEM;
1657
1658         shost = iscsi_session_to_shost(session);
1659         ev->r.c_session_ret.host_no = shost->host_no;
1660         ev->r.c_session_ret.sid = session->sid;
1661         ISCSI_DBG_TRANS_SESSION(session,
1662                                 "Completed creating transport session\n");
1663         return 0;
1664 }
1665
1666 static int
1667 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1668 {
1669         struct iscsi_cls_conn *conn;
1670         struct iscsi_cls_session *session;
1671
1672         session = iscsi_session_lookup(ev->u.c_conn.sid);
1673         if (!session) {
1674                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1675                        ev->u.c_conn.sid);
1676                 return -EINVAL;
1677         }
1678
1679         conn = transport->create_conn(session, ev->u.c_conn.cid);
1680         if (!conn) {
1681                 iscsi_cls_session_printk(KERN_ERR, session,
1682                                          "couldn't create a new connection.");
1683                 return -ENOMEM;
1684         }
1685
1686         ev->r.c_conn_ret.sid = session->sid;
1687         ev->r.c_conn_ret.cid = conn->cid;
1688
1689         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1690         return 0;
1691 }
1692
1693 static int
1694 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1695 {
1696         struct iscsi_cls_conn *conn;
1697
1698         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1699         if (!conn)
1700                 return -EINVAL;
1701
1702         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1703         if (transport->destroy_conn)
1704                 transport->destroy_conn(conn);
1705
1706         return 0;
1707 }
1708
1709 static int
1710 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1711 {
1712         char *data = (char*)ev + sizeof(*ev);
1713         struct iscsi_cls_conn *conn;
1714         struct iscsi_cls_session *session;
1715         int err = 0, value = 0;
1716
1717         session = iscsi_session_lookup(ev->u.set_param.sid);
1718         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1719         if (!conn || !session)
1720                 return -EINVAL;
1721
1722         switch (ev->u.set_param.param) {
1723         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1724                 sscanf(data, "%d", &value);
1725                 session->recovery_tmo = value;
1726                 break;
1727         default:
1728                 err = transport->set_param(conn, ev->u.set_param.param,
1729                                            data, ev->u.set_param.len);
1730         }
1731
1732         return err;
1733 }
1734
1735 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1736                                struct iscsi_uevent *ev, int msg_type)
1737 {
1738         struct iscsi_endpoint *ep;
1739         struct sockaddr *dst_addr;
1740         struct Scsi_Host *shost = NULL;
1741         int non_blocking, err = 0;
1742
1743         if (!transport->ep_connect)
1744                 return -EINVAL;
1745
1746         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1747                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1748                 if (!shost) {
1749                         printk(KERN_ERR "ep connect failed. Could not find "
1750                                "host no %u\n",
1751                                ev->u.ep_connect_through_host.host_no);
1752                         return -ENODEV;
1753                 }
1754                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1755         } else
1756                 non_blocking = ev->u.ep_connect.non_blocking;
1757
1758         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1759         ep = transport->ep_connect(shost, dst_addr, non_blocking);
1760         if (IS_ERR(ep)) {
1761                 err = PTR_ERR(ep);
1762                 goto release_host;
1763         }
1764
1765         ev->r.ep_connect_ret.handle = ep->id;
1766 release_host:
1767         if (shost)
1768                 scsi_host_put(shost);
1769         return err;
1770 }
1771
1772 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1773                                   u64 ep_handle)
1774 {
1775         struct iscsi_cls_conn *conn;
1776         struct iscsi_endpoint *ep;
1777
1778         if (!transport->ep_disconnect)
1779                 return -EINVAL;
1780
1781         ep = iscsi_lookup_endpoint(ep_handle);
1782         if (!ep)
1783                 return -EINVAL;
1784         conn = ep->conn;
1785         if (conn) {
1786                 mutex_lock(&conn->ep_mutex);
1787                 conn->ep = NULL;
1788                 mutex_unlock(&conn->ep_mutex);
1789         }
1790
1791         transport->ep_disconnect(ep);
1792         return 0;
1793 }
1794
1795 static int
1796 iscsi_if_transport_ep(struct iscsi_transport *transport,
1797                       struct iscsi_uevent *ev, int msg_type)
1798 {
1799         struct iscsi_endpoint *ep;
1800         int rc = 0;
1801
1802         switch (msg_type) {
1803         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1804         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1805                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1806                 break;
1807         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1808                 if (!transport->ep_poll)
1809                         return -EINVAL;
1810
1811                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1812                 if (!ep)
1813                         return -EINVAL;
1814
1815                 ev->r.retcode = transport->ep_poll(ep,
1816                                                    ev->u.ep_poll.timeout_ms);
1817                 break;
1818         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1819                 rc = iscsi_if_ep_disconnect(transport,
1820                                             ev->u.ep_disconnect.ep_handle);
1821                 break;
1822         }
1823         return rc;
1824 }
1825
1826 static int
1827 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1828                 struct iscsi_uevent *ev)
1829 {
1830         struct Scsi_Host *shost;
1831         struct sockaddr *dst_addr;
1832         int err;
1833
1834         if (!transport->tgt_dscvr)
1835                 return -EINVAL;
1836
1837         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1838         if (!shost) {
1839                 printk(KERN_ERR "target discovery could not find host no %u\n",
1840                        ev->u.tgt_dscvr.host_no);
1841                 return -ENODEV;
1842         }
1843
1844
1845         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1846         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1847                                    ev->u.tgt_dscvr.enable, dst_addr);
1848         scsi_host_put(shost);
1849         return err;
1850 }
1851
1852 static int
1853 iscsi_set_host_param(struct iscsi_transport *transport,
1854                      struct iscsi_uevent *ev)
1855 {
1856         char *data = (char*)ev + sizeof(*ev);
1857         struct Scsi_Host *shost;
1858         int err;
1859
1860         if (!transport->set_host_param)
1861                 return -ENOSYS;
1862
1863         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1864         if (!shost) {
1865                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1866                        ev->u.set_host_param.host_no);
1867                 return -ENODEV;
1868         }
1869
1870         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1871                                         data, ev->u.set_host_param.len);
1872         scsi_host_put(shost);
1873         return err;
1874 }
1875
1876 static int
1877 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1878 {
1879         struct Scsi_Host *shost;
1880         struct iscsi_path *params;
1881         int err;
1882
1883         if (!transport->set_path)
1884                 return -ENOSYS;
1885
1886         shost = scsi_host_lookup(ev->u.set_path.host_no);
1887         if (!shost) {
1888                 printk(KERN_ERR "set path could not find host no %u\n",
1889                        ev->u.set_path.host_no);
1890                 return -ENODEV;
1891         }
1892
1893         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1894         err = transport->set_path(shost, params);
1895
1896         scsi_host_put(shost);
1897         return err;
1898 }
1899
1900 static int
1901 iscsi_set_iface_params(struct iscsi_transport *transport,
1902                        struct iscsi_uevent *ev)
1903 {
1904         char *data = (char *)ev + sizeof(*ev);
1905         struct Scsi_Host *shost;
1906         int err;
1907
1908         if (!transport->set_iface_param)
1909                 return -ENOSYS;
1910
1911         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1912         if (!shost) {
1913                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1914                        ev->u.set_iface_params.host_no);
1915                 return -ENODEV;
1916         }
1917
1918         err = transport->set_iface_param(shost, data,
1919                                          ev->u.set_iface_params.count);
1920         scsi_host_put(shost);
1921         return err;
1922 }
1923
1924 static int
1925 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1926 {
1927         int err = 0;
1928         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1929         struct iscsi_transport *transport = NULL;
1930         struct iscsi_internal *priv;
1931         struct iscsi_cls_session *session;
1932         struct iscsi_cls_conn *conn;
1933         struct iscsi_endpoint *ep = NULL;
1934
1935         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1936                 *group = ISCSI_NL_GRP_UIP;
1937         else
1938                 *group = ISCSI_NL_GRP_ISCSID;
1939
1940         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1941         if (!priv)
1942                 return -EINVAL;
1943         transport = priv->iscsi_transport;
1944
1945         if (!try_module_get(transport->owner))
1946                 return -EINVAL;
1947
1948         switch (nlh->nlmsg_type) {
1949         case ISCSI_UEVENT_CREATE_SESSION:
1950                 err = iscsi_if_create_session(priv, ep, ev,
1951                                               ev->u.c_session.initial_cmdsn,
1952                                               ev->u.c_session.cmds_max,
1953                                               ev->u.c_session.queue_depth);
1954                 break;
1955         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1956                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1957                 if (!ep) {
1958                         err = -EINVAL;
1959                         break;
1960                 }
1961
1962                 err = iscsi_if_create_session(priv, ep, ev,
1963                                         ev->u.c_bound_session.initial_cmdsn,
1964                                         ev->u.c_bound_session.cmds_max,
1965                                         ev->u.c_bound_session.queue_depth);
1966                 break;
1967         case ISCSI_UEVENT_DESTROY_SESSION:
1968                 session = iscsi_session_lookup(ev->u.d_session.sid);
1969                 if (session)
1970                         transport->destroy_session(session);
1971                 else
1972                         err = -EINVAL;
1973                 break;
1974         case ISCSI_UEVENT_UNBIND_SESSION:
1975                 session = iscsi_session_lookup(ev->u.d_session.sid);
1976                 if (session)
1977                         scsi_queue_work(iscsi_session_to_shost(session),
1978                                         &session->unbind_work);
1979                 else
1980                         err = -EINVAL;
1981                 break;
1982         case ISCSI_UEVENT_CREATE_CONN:
1983                 err = iscsi_if_create_conn(transport, ev);
1984                 break;
1985         case ISCSI_UEVENT_DESTROY_CONN:
1986                 err = iscsi_if_destroy_conn(transport, ev);
1987                 break;
1988         case ISCSI_UEVENT_BIND_CONN:
1989                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1990                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1991
1992                 if (conn && conn->ep)
1993                         iscsi_if_ep_disconnect(transport, conn->ep->id);
1994
1995                 if (!session || !conn) {
1996                         err = -EINVAL;
1997                         break;
1998                 }
1999
2000                 ev->r.retcode = transport->bind_conn(session, conn,
2001                                                 ev->u.b_conn.transport_eph,
2002                                                 ev->u.b_conn.is_leading);
2003                 if (ev->r.retcode || !transport->ep_connect)
2004                         break;
2005
2006                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2007                 if (ep) {
2008                         ep->conn = conn;
2009
2010                         mutex_lock(&conn->ep_mutex);
2011                         conn->ep = ep;
2012                         mutex_unlock(&conn->ep_mutex);
2013                 } else
2014                         iscsi_cls_conn_printk(KERN_ERR, conn,
2015                                               "Could not set ep conn "
2016                                               "binding\n");
2017                 break;
2018         case ISCSI_UEVENT_SET_PARAM:
2019                 err = iscsi_set_param(transport, ev);
2020                 break;
2021         case ISCSI_UEVENT_START_CONN:
2022                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
2023                 if (conn)
2024                         ev->r.retcode = transport->start_conn(conn);
2025                 else
2026                         err = -EINVAL;
2027                 break;
2028         case ISCSI_UEVENT_STOP_CONN:
2029                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2030                 if (conn)
2031                         transport->stop_conn(conn, ev->u.stop_conn.flag);
2032                 else
2033                         err = -EINVAL;
2034                 break;
2035         case ISCSI_UEVENT_SEND_PDU:
2036                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
2037                 if (conn)
2038                         ev->r.retcode = transport->send_pdu(conn,
2039                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2040                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2041                                 ev->u.send_pdu.data_size);
2042                 else
2043                         err = -EINVAL;
2044                 break;
2045         case ISCSI_UEVENT_GET_STATS:
2046                 err = iscsi_if_get_stats(transport, nlh);
2047                 break;
2048         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2049         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2050         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2051         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2052                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2053                 break;
2054         case ISCSI_UEVENT_TGT_DSCVR:
2055                 err = iscsi_tgt_dscvr(transport, ev);
2056                 break;
2057         case ISCSI_UEVENT_SET_HOST_PARAM:
2058                 err = iscsi_set_host_param(transport, ev);
2059                 break;
2060         case ISCSI_UEVENT_PATH_UPDATE:
2061                 err = iscsi_set_path(transport, ev);
2062                 break;
2063         case ISCSI_UEVENT_SET_IFACE_PARAMS:
2064                 err = iscsi_set_iface_params(transport, ev);
2065                 break;
2066         default:
2067                 err = -ENOSYS;
2068                 break;
2069         }
2070
2071         module_put(transport->owner);
2072         return err;
2073 }
2074
2075 /*
2076  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
2077  * Malformed skbs with wrong lengths or invalid creds are not processed.
2078  */
2079 static void
2080 iscsi_if_rx(struct sk_buff *skb)
2081 {
2082         mutex_lock(&rx_queue_mutex);
2083         while (skb->len >= NLMSG_SPACE(0)) {
2084                 int err;
2085                 uint32_t rlen;
2086                 struct nlmsghdr *nlh;
2087                 struct iscsi_uevent *ev;
2088                 uint32_t group;
2089
2090                 nlh = nlmsg_hdr(skb);
2091                 if (nlh->nlmsg_len < sizeof(*nlh) ||
2092                     skb->len < nlh->nlmsg_len) {
2093                         break;
2094                 }
2095
2096                 ev = NLMSG_DATA(nlh);
2097                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2098                 if (rlen > skb->len)
2099                         rlen = skb->len;
2100
2101                 err = iscsi_if_recv_msg(skb, nlh, &group);
2102                 if (err) {
2103                         ev->type = ISCSI_KEVENT_IF_ERROR;
2104                         ev->iferror = err;
2105                 }
2106                 do {
2107                         /*
2108                          * special case for GET_STATS:
2109                          * on success - sending reply and stats from
2110                          * inside of if_recv_msg(),
2111                          * on error - fall through.
2112                          */
2113                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2114                                 break;
2115                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
2116                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2117                 } while (err < 0 && err != -ECONNREFUSED);
2118                 skb_pull(skb, rlen);
2119         }
2120         mutex_unlock(&rx_queue_mutex);
2121 }
2122
2123 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
2124 struct device_attribute dev_attr_##_prefix##_##_name =  \
2125         __ATTR(_name,_mode,_show,_store)
2126
2127 /*
2128  * iSCSI connection attrs
2129  */
2130 #define iscsi_conn_attr_show(param)                                     \
2131 static ssize_t                                                          \
2132 show_conn_param_##param(struct device *dev,                             \
2133                         struct device_attribute *attr, char *buf)       \
2134 {                                                                       \
2135         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2136         struct iscsi_transport *t = conn->transport;                    \
2137         return t->get_conn_param(conn, param, buf);                     \
2138 }
2139
2140 #define iscsi_conn_attr(field, param)                                   \
2141         iscsi_conn_attr_show(param)                                     \
2142 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
2143                         NULL);
2144
2145 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2146 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2147 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2148 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2149 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2150 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2151 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
2152 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2153 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
2154 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2155 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
2156
2157 #define iscsi_conn_ep_attr_show(param)                                  \
2158 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
2159                                           struct device_attribute *attr,\
2160                                           char *buf)                    \
2161 {                                                                       \
2162         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2163         struct iscsi_transport *t = conn->transport;                    \
2164         struct iscsi_endpoint *ep;                                      \
2165         ssize_t rc;                                                     \
2166                                                                         \
2167         /*                                                              \
2168          * Need to make sure ep_disconnect does not free the LLD's      \
2169          * interconnect resources while we are trying to read them.     \
2170          */                                                             \
2171         mutex_lock(&conn->ep_mutex);                                    \
2172         ep = conn->ep;                                                  \
2173         if (!ep && t->ep_connect) {                                     \
2174                 mutex_unlock(&conn->ep_mutex);                          \
2175                 return -ENOTCONN;                                       \
2176         }                                                               \
2177                                                                         \
2178         if (ep)                                                         \
2179                 rc = t->get_ep_param(ep, param, buf);                   \
2180         else                                                            \
2181                 rc = t->get_conn_param(conn, param, buf);               \
2182         mutex_unlock(&conn->ep_mutex);                                  \
2183         return rc;                                                      \
2184 }
2185
2186 #define iscsi_conn_ep_attr(field, param)                                \
2187         iscsi_conn_ep_attr_show(param)                                  \
2188 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2189                         show_conn_ep_param_##param, NULL);
2190
2191 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2192 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2193
2194 static struct attribute *iscsi_conn_attrs[] = {
2195         &dev_attr_conn_max_recv_dlength.attr,
2196         &dev_attr_conn_max_xmit_dlength.attr,
2197         &dev_attr_conn_header_digest.attr,
2198         &dev_attr_conn_data_digest.attr,
2199         &dev_attr_conn_ifmarker.attr,
2200         &dev_attr_conn_ofmarker.attr,
2201         &dev_attr_conn_address.attr,
2202         &dev_attr_conn_port.attr,
2203         &dev_attr_conn_exp_statsn.attr,
2204         &dev_attr_conn_persistent_address.attr,
2205         &dev_attr_conn_persistent_port.attr,
2206         &dev_attr_conn_ping_tmo.attr,
2207         &dev_attr_conn_recv_tmo.attr,
2208         NULL,
2209 };
2210
2211 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2212                                          struct attribute *attr, int i)
2213 {
2214         struct device *cdev = container_of(kobj, struct device, kobj);
2215         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2216         struct iscsi_transport *t = conn->transport;
2217         int param;
2218
2219         if (attr == &dev_attr_conn_max_recv_dlength.attr)
2220                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2221         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2222                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2223         else if (attr == &dev_attr_conn_header_digest.attr)
2224                 param = ISCSI_PARAM_HDRDGST_EN;
2225         else if (attr == &dev_attr_conn_data_digest.attr)
2226                 param = ISCSI_PARAM_DATADGST_EN;
2227         else if (attr == &dev_attr_conn_ifmarker.attr)
2228                 param = ISCSI_PARAM_IFMARKER_EN;
2229         else if (attr == &dev_attr_conn_ofmarker.attr)
2230                 param = ISCSI_PARAM_OFMARKER_EN;
2231         else if (attr == &dev_attr_conn_address.attr)
2232                 param = ISCSI_PARAM_CONN_ADDRESS;
2233         else if (attr == &dev_attr_conn_port.attr)
2234                 param = ISCSI_PARAM_CONN_PORT;
2235         else if (attr == &dev_attr_conn_exp_statsn.attr)
2236                 param = ISCSI_PARAM_EXP_STATSN;
2237         else if (attr == &dev_attr_conn_persistent_address.attr)
2238                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2239         else if (attr == &dev_attr_conn_persistent_port.attr)
2240                 param = ISCSI_PARAM_PERSISTENT_PORT;
2241         else if (attr == &dev_attr_conn_ping_tmo.attr)
2242                 param = ISCSI_PARAM_PING_TMO;
2243         else if (attr == &dev_attr_conn_recv_tmo.attr)
2244                 param = ISCSI_PARAM_RECV_TMO;
2245         else {
2246                 WARN_ONCE(1, "Invalid conn attr");
2247                 return 0;
2248         }
2249
2250         return t->attr_is_visible(ISCSI_PARAM, param);
2251 }
2252
2253 static struct attribute_group iscsi_conn_group = {
2254         .attrs = iscsi_conn_attrs,
2255         .is_visible = iscsi_conn_attr_is_visible,
2256 };
2257
2258 /*
2259  * iSCSI session attrs
2260  */
2261 #define iscsi_session_attr_show(param, perm)                            \
2262 static ssize_t                                                          \
2263 show_session_param_##param(struct device *dev,                          \
2264                            struct device_attribute *attr, char *buf)    \
2265 {                                                                       \
2266         struct iscsi_cls_session *session =                             \
2267                 iscsi_dev_to_session(dev->parent);                      \
2268         struct iscsi_transport *t = session->transport;                 \
2269                                                                         \
2270         if (perm && !capable(CAP_SYS_ADMIN))                            \
2271                 return -EACCES;                                         \
2272         return t->get_session_param(session, param, buf);               \
2273 }
2274
2275 #define iscsi_session_attr(field, param, perm)                          \
2276         iscsi_session_attr_show(param, perm)                            \
2277 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2278                         NULL);
2279 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2280 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2281 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2282 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2283 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2284 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2285 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2286 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2287 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2288 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2289 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2290 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2291 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2292 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2293 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2294 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2295 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2296 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2297 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2298 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2299 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2300
2301 static ssize_t
2302 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2303                         char *buf)
2304 {
2305         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2306         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2307 }
2308 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2309                         NULL);
2310
2311 #define iscsi_priv_session_attr_show(field, format)                     \
2312 static ssize_t                                                          \
2313 show_priv_session_##field(struct device *dev,                           \
2314                           struct device_attribute *attr, char *buf)     \
2315 {                                                                       \
2316         struct iscsi_cls_session *session =                             \
2317                         iscsi_dev_to_session(dev->parent);              \
2318         if (session->field == -1)                                       \
2319                 return sprintf(buf, "off\n");                           \
2320         return sprintf(buf, format"\n", session->field);                \
2321 }
2322
2323 #define iscsi_priv_session_attr_store(field)                            \
2324 static ssize_t                                                          \
2325 store_priv_session_##field(struct device *dev,                          \
2326                            struct device_attribute *attr,               \
2327                            const char *buf, size_t count)               \
2328 {                                                                       \
2329         int val;                                                        \
2330         char *cp;                                                       \
2331         struct iscsi_cls_session *session =                             \
2332                 iscsi_dev_to_session(dev->parent);                      \
2333         if ((session->state == ISCSI_SESSION_FREE) ||                   \
2334             (session->state == ISCSI_SESSION_FAILED))                   \
2335                 return -EBUSY;                                          \
2336         if (strncmp(buf, "off", 3) == 0)                                \
2337                 session->field = -1;                                    \
2338         else {                                                          \
2339                 val = simple_strtoul(buf, &cp, 0);                      \
2340                 if (*cp != '\0' && *cp != '\n')                         \
2341                         return -EINVAL;                                 \
2342                 session->field = val;                                   \
2343         }                                                               \
2344         return count;                                                   \
2345 }
2346
2347 #define iscsi_priv_session_rw_attr(field, format)                       \
2348         iscsi_priv_session_attr_show(field, format)                     \
2349         iscsi_priv_session_attr_store(field)                            \
2350 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2351                         show_priv_session_##field,                      \
2352                         store_priv_session_##field)
2353 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2354
2355 static struct attribute *iscsi_session_attrs[] = {
2356         &dev_attr_sess_initial_r2t.attr,
2357         &dev_attr_sess_max_outstanding_r2t.attr,
2358         &dev_attr_sess_immediate_data.attr,
2359         &dev_attr_sess_first_burst_len.attr,
2360         &dev_attr_sess_max_burst_len.attr,
2361         &dev_attr_sess_data_pdu_in_order.attr,
2362         &dev_attr_sess_data_seq_in_order.attr,
2363         &dev_attr_sess_erl.attr,
2364         &dev_attr_sess_targetname.attr,
2365         &dev_attr_sess_tpgt.attr,
2366         &dev_attr_sess_password.attr,
2367         &dev_attr_sess_password_in.attr,
2368         &dev_attr_sess_username.attr,
2369         &dev_attr_sess_username_in.attr,
2370         &dev_attr_sess_fast_abort.attr,
2371         &dev_attr_sess_abort_tmo.attr,
2372         &dev_attr_sess_lu_reset_tmo.attr,
2373         &dev_attr_sess_tgt_reset_tmo.attr,
2374         &dev_attr_sess_ifacename.attr,
2375         &dev_attr_sess_initiatorname.attr,
2376         &dev_attr_sess_targetalias.attr,
2377         &dev_attr_priv_sess_recovery_tmo.attr,
2378         &dev_attr_priv_sess_state.attr,
2379         NULL,
2380 };
2381
2382 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2383                                             struct attribute *attr, int i)
2384 {
2385         struct device *cdev = container_of(kobj, struct device, kobj);
2386         struct iscsi_cls_session *session = transport_class_to_session(cdev);
2387         struct iscsi_transport *t = session->transport;
2388         int param;
2389
2390         if (attr == &dev_attr_sess_initial_r2t.attr)
2391                 param = ISCSI_PARAM_INITIAL_R2T_EN;
2392         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2393                 param = ISCSI_PARAM_MAX_R2T;
2394         else if (attr == &dev_attr_sess_immediate_data.attr)
2395                 param = ISCSI_PARAM_IMM_DATA_EN;
2396         else if (attr == &dev_attr_sess_first_burst_len.attr)
2397                 param = ISCSI_PARAM_FIRST_BURST;
2398         else if (attr == &dev_attr_sess_max_burst_len.attr)
2399                 param = ISCSI_PARAM_MAX_BURST;
2400         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2401                 param = ISCSI_PARAM_PDU_INORDER_EN;
2402         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2403                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2404         else if (attr == &dev_attr_sess_erl.attr)
2405                 param = ISCSI_PARAM_ERL;
2406         else if (attr == &dev_attr_sess_targetname.attr)
2407                 param = ISCSI_PARAM_TARGET_NAME;
2408         else if (attr == &dev_attr_sess_tpgt.attr)
2409                 param = ISCSI_PARAM_TPGT;
2410         else if (attr == &dev_attr_sess_password.attr)
2411                 param = ISCSI_PARAM_USERNAME;
2412         else if (attr == &dev_attr_sess_password_in.attr)
2413                 param = ISCSI_PARAM_USERNAME_IN;
2414         else if (attr == &dev_attr_sess_username.attr)
2415                 param = ISCSI_PARAM_PASSWORD;
2416         else if (attr == &dev_attr_sess_username_in.attr)
2417                 param = ISCSI_PARAM_PASSWORD_IN;
2418         else if (attr == &dev_attr_sess_fast_abort.attr)
2419                 param = ISCSI_PARAM_FAST_ABORT;
2420         else if (attr == &dev_attr_sess_abort_tmo.attr)
2421                 param = ISCSI_PARAM_ABORT_TMO;
2422         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2423                 param = ISCSI_PARAM_LU_RESET_TMO;
2424         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2425                 param = ISCSI_PARAM_TGT_RESET_TMO;
2426         else if (attr == &dev_attr_sess_ifacename.attr)
2427                 param = ISCSI_PARAM_IFACE_NAME;
2428         else if (attr == &dev_attr_sess_initiatorname.attr)
2429                 param = ISCSI_PARAM_INITIATOR_NAME;
2430         else if (attr == &dev_attr_sess_targetalias.attr)
2431                 param = ISCSI_PARAM_TARGET_ALIAS;
2432         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2433                 return S_IRUGO | S_IWUSR;
2434         else if (attr == &dev_attr_priv_sess_state.attr)
2435                 return S_IRUGO;
2436         else {
2437                 WARN_ONCE(1, "Invalid session attr");
2438                 return 0;
2439         }
2440
2441         return t->attr_is_visible(ISCSI_PARAM, param);
2442 }
2443
2444 static struct attribute_group iscsi_session_group = {
2445         .attrs = iscsi_session_attrs,
2446         .is_visible = iscsi_session_attr_is_visible,
2447 };
2448
2449 /*
2450  * iSCSI host attrs
2451  */
2452 #define iscsi_host_attr_show(param)                                     \
2453 static ssize_t                                                          \
2454 show_host_param_##param(struct device *dev,                             \
2455                         struct device_attribute *attr, char *buf)       \
2456 {                                                                       \
2457         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2458         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2459         return priv->iscsi_transport->get_host_param(shost, param, buf); \
2460 }
2461
2462 #define iscsi_host_attr(field, param)                                   \
2463         iscsi_host_attr_show(param)                                     \
2464 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2465                         NULL);
2466
2467 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2468 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2469 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2470 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2471
2472 static struct attribute *iscsi_host_attrs[] = {
2473         &dev_attr_host_netdev.attr,
2474         &dev_attr_host_hwaddress.attr,
2475         &dev_attr_host_ipaddress.attr,
2476         &dev_attr_host_initiatorname.attr,
2477         NULL,
2478 };
2479
2480 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2481                                          struct attribute *attr, int i)
2482 {
2483         struct device *cdev = container_of(kobj, struct device, kobj);
2484         struct Scsi_Host *shost = transport_class_to_shost(cdev);
2485         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2486         int param;
2487
2488         if (attr == &dev_attr_host_netdev.attr)
2489                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2490         else if (attr == &dev_attr_host_hwaddress.attr)
2491                 param = ISCSI_HOST_PARAM_HWADDRESS;
2492         else if (attr == &dev_attr_host_ipaddress.attr)
2493                 param = ISCSI_HOST_PARAM_IPADDRESS;
2494         else if (attr == &dev_attr_host_initiatorname.attr)
2495                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2496         else {
2497                 WARN_ONCE(1, "Invalid host attr");
2498                 return 0;
2499         }
2500
2501         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2502 }
2503
2504 static struct attribute_group iscsi_host_group = {
2505         .attrs = iscsi_host_attrs,
2506         .is_visible = iscsi_host_attr_is_visible,
2507 };
2508
2509 static int iscsi_session_match(struct attribute_container *cont,
2510                            struct device *dev)
2511 {
2512         struct iscsi_cls_session *session;
2513         struct Scsi_Host *shost;
2514         struct iscsi_internal *priv;
2515
2516         if (!iscsi_is_session_dev(dev))
2517                 return 0;
2518
2519         session = iscsi_dev_to_session(dev);
2520         shost = iscsi_session_to_shost(session);
2521         if (!shost->transportt)
2522                 return 0;
2523
2524         priv = to_iscsi_internal(shost->transportt);
2525         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2526                 return 0;
2527
2528         return &priv->session_cont.ac == cont;
2529 }
2530
2531 static int iscsi_conn_match(struct attribute_container *cont,
2532                            struct device *dev)
2533 {
2534         struct iscsi_cls_session *session;
2535         struct iscsi_cls_conn *conn;
2536         struct Scsi_Host *shost;
2537         struct iscsi_internal *priv;
2538
2539         if (!iscsi_is_conn_dev(dev))
2540                 return 0;
2541
2542         conn = iscsi_dev_to_conn(dev);
2543         session = iscsi_dev_to_session(conn->dev.parent);
2544         shost = iscsi_session_to_shost(session);
2545
2546         if (!shost->transportt)
2547                 return 0;
2548
2549         priv = to_iscsi_internal(shost->transportt);
2550         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2551                 return 0;
2552
2553         return &priv->conn_cont.ac == cont;
2554 }
2555
2556 static int iscsi_host_match(struct attribute_container *cont,
2557                             struct device *dev)
2558 {
2559         struct Scsi_Host *shost;
2560         struct iscsi_internal *priv;
2561
2562         if (!scsi_is_host_device(dev))
2563                 return 0;
2564
2565         shost = dev_to_shost(dev);
2566         if (!shost->transportt  ||
2567             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2568                 return 0;
2569
2570         priv = to_iscsi_internal(shost->transportt);
2571         return &priv->t.host_attrs.ac == cont;
2572 }
2573
2574 struct scsi_transport_template *
2575 iscsi_register_transport(struct iscsi_transport *tt)
2576 {
2577         struct iscsi_internal *priv;
2578         unsigned long flags;
2579         int err;
2580
2581         BUG_ON(!tt);
2582
2583         priv = iscsi_if_transport_lookup(tt);
2584         if (priv)
2585                 return NULL;
2586
2587         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2588         if (!priv)
2589                 return NULL;
2590         INIT_LIST_HEAD(&priv->list);
2591         priv->iscsi_transport = tt;
2592         priv->t.user_scan = iscsi_user_scan;
2593         priv->t.create_work_queue = 1;
2594
2595         priv->dev.class = &iscsi_transport_class;
2596         dev_set_name(&priv->dev, "%s", tt->name);
2597         err = device_register(&priv->dev);
2598         if (err)
2599                 goto free_priv;
2600
2601         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2602         if (err)
2603                 goto unregister_dev;
2604
2605         /* host parameters */
2606         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2607         priv->t.host_attrs.ac.match = iscsi_host_match;
2608         priv->t.host_attrs.ac.grp = &iscsi_host_group;
2609         priv->t.host_size = sizeof(struct iscsi_cls_host);
2610         transport_container_register(&priv->t.host_attrs);
2611
2612         /* connection parameters */
2613         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2614         priv->conn_cont.ac.match = iscsi_conn_match;
2615         priv->conn_cont.ac.grp = &iscsi_conn_group;
2616         transport_container_register(&priv->conn_cont);
2617
2618         /* session parameters */
2619         priv->session_cont.ac.class = &iscsi_session_class.class;
2620         priv->session_cont.ac.match = iscsi_session_match;
2621         priv->session_cont.ac.grp = &iscsi_session_group;
2622         transport_container_register(&priv->session_cont);
2623
2624         spin_lock_irqsave(&iscsi_transport_lock, flags);
2625         list_add(&priv->list, &iscsi_transports);
2626         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2627
2628         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2629         return &priv->t;
2630
2631 unregister_dev:
2632         device_unregister(&priv->dev);
2633         return NULL;
2634 free_priv:
2635         kfree(priv);
2636         return NULL;
2637 }
2638 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2639
2640 int iscsi_unregister_transport(struct iscsi_transport *tt)
2641 {
2642         struct iscsi_internal *priv;
2643         unsigned long flags;
2644
2645         BUG_ON(!tt);
2646
2647         mutex_lock(&rx_queue_mutex);
2648
2649         priv = iscsi_if_transport_lookup(tt);
2650         BUG_ON (!priv);
2651
2652         spin_lock_irqsave(&iscsi_transport_lock, flags);
2653         list_del(&priv->list);
2654         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2655
2656         transport_container_unregister(&priv->conn_cont);
2657         transport_container_unregister(&priv->session_cont);
2658         transport_container_unregister(&priv->t.host_attrs);
2659
2660         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2661         device_unregister(&priv->dev);
2662         mutex_unlock(&rx_queue_mutex);
2663
2664         return 0;
2665 }
2666 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2667
2668 static __init int iscsi_transport_init(void)
2669 {
2670         int err;
2671
2672         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2673                 ISCSI_TRANSPORT_VERSION);
2674
2675         atomic_set(&iscsi_session_nr, 0);
2676
2677         err = class_register(&iscsi_transport_class);
2678         if (err)
2679                 return err;
2680
2681         err = class_register(&iscsi_endpoint_class);
2682         if (err)
2683                 goto unregister_transport_class;
2684
2685         err = class_register(&iscsi_iface_class);
2686         if (err)
2687                 goto unregister_endpoint_class;
2688
2689         err = transport_class_register(&iscsi_host_class);
2690         if (err)
2691                 goto unregister_iface_class;
2692
2693         err = transport_class_register(&iscsi_connection_class);
2694         if (err)
2695                 goto unregister_host_class;
2696
2697         err = transport_class_register(&iscsi_session_class);
2698         if (err)
2699                 goto unregister_conn_class;
2700
2701         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2702                                     NULL, THIS_MODULE);
2703         if (!nls) {
2704                 err = -ENOBUFS;
2705                 goto unregister_session_class;
2706         }
2707
2708         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2709         if (!iscsi_eh_timer_workq)
2710                 goto release_nls;
2711
2712         return 0;
2713
2714 release_nls:
2715         netlink_kernel_release(nls);
2716 unregister_session_class:
2717         transport_class_unregister(&iscsi_session_class);
2718 unregister_conn_class:
2719         transport_class_unregister(&iscsi_connection_class);
2720 unregister_host_class:
2721         transport_class_unregister(&iscsi_host_class);
2722 unregister_iface_class:
2723         class_unregister(&iscsi_iface_class);
2724 unregister_endpoint_class:
2725         class_unregister(&iscsi_endpoint_class);
2726 unregister_transport_class:
2727         class_unregister(&iscsi_transport_class);
2728         return err;
2729 }
2730
2731 static void __exit iscsi_transport_exit(void)
2732 {
2733         destroy_workqueue(iscsi_eh_timer_workq);
2734         netlink_kernel_release(nls);
2735         transport_class_unregister(&iscsi_connection_class);
2736         transport_class_unregister(&iscsi_session_class);
2737         transport_class_unregister(&iscsi_host_class);
2738         class_unregister(&iscsi_endpoint_class);
2739         class_unregister(&iscsi_iface_class);
2740         class_unregister(&iscsi_transport_class);
2741 }
2742
2743 module_init(iscsi_transport_init);
2744 module_exit(iscsi_transport_exit);
2745
2746 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2747               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2748               "Alex Aizman <itn780@yahoo.com>");
2749 MODULE_DESCRIPTION("iSCSI Transport Interface");
2750 MODULE_LICENSE("GPL");
2751 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2752 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);