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 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 328
 329 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 330                                           struct attribute *attr, int i)
 331 {
 332         struct device *dev = container_of(kobj, struct device, kobj);
 333         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 334         struct iscsi_transport *t = iface->transport;
 335         int param;
 336
 337         if (attr == &dev_attr_iface_enabled.attr)
 338                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 339         else if (attr == &dev_attr_iface_vlan.attr)
 340                 param = ISCSI_NET_PARAM_VLAN_ID;
 341         else if (attr == &dev_attr_iface_vlan_priority.attr)
 342                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 343         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 344                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 345         else if (attr == &dev_attr_iface_mtu.attr)
 346                 param = ISCSI_NET_PARAM_MTU;
 347         else if (attr == &dev_attr_iface_port.attr)
 348                 param = ISCSI_NET_PARAM_PORT;
 349         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 350                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 351                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 352                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 353                         param = ISCSI_NET_PARAM_IPV4_GW;
 354                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 355                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 356                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 357                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 358                 else
 359                         return 0;
 360         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 361                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 362                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 363                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 364                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 365                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 366                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 367                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 368                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 369                 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
 370                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 371                 else
 372                         return 0;
 373         } else {
 374                 WARN_ONCE(1, "Invalid iface attr");
 375                 return 0;
 376         }
 377
 378         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 379 }
 380
 381 static struct attribute *iscsi_iface_attrs[] = {
 382         &dev_attr_iface_enabled.attr,
 383         &dev_attr_iface_vlan.attr,
 384         &dev_attr_iface_vlan_priority.attr,
 385         &dev_attr_iface_vlan_enabled.attr,
 386         &dev_attr_ipv4_iface_ipaddress.attr,
 387         &dev_attr_ipv4_iface_gateway.attr,
 388         &dev_attr_ipv4_iface_subnet.attr,
 389         &dev_attr_ipv4_iface_bootproto.attr,
 390         &dev_attr_ipv6_iface_ipaddress.attr,
 391         &dev_attr_ipv6_iface_link_local_addr.attr,
 392         &dev_attr_ipv6_iface_router_addr.attr,
 393         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 394         &dev_attr_ipv6_iface_linklocal_autocfg.attr,
 395         &dev_attr_iface_mtu.attr,
 396         &dev_attr_iface_port.attr,
 397         NULL,
 398 };
 399
 400 static struct attribute_group iscsi_iface_group = {
 401         .attrs = iscsi_iface_attrs,
 402         .is_visible = iscsi_iface_attr_is_visible,
 403 };
 404
 405 struct iscsi_iface *
 406 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 407                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 408 {
 409         struct iscsi_iface *iface;
 410         int err;
 411
 412         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 413         if (!iface)
 414                 return NULL;
 415
 416         iface->transport = transport;
 417         iface->iface_type = iface_type;
 418         iface->iface_num = iface_num;
 419         iface->dev.release = iscsi_iface_release;
 420         iface->dev.class = &iscsi_iface_class;
 421         /* parent reference released in iscsi_iface_release */
 422         iface->dev.parent = get_device(&shost->shost_gendev);
 423         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 424                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 425                              iface_num);
 426         else
 427                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 428                              iface_num);
 429
 430         err = device_register(&iface->dev);
 431         if (err)
 432                 goto free_iface;
 433
 434         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 435         if (err)
 436                 goto unreg_iface;
 437
 438         if (dd_size)
 439                 iface->dd_data = &iface[1];
 440         return iface;
 441
 442 unreg_iface:
 443         device_unregister(&iface->dev);
 444         return NULL;
 445
 446 free_iface:
 447         put_device(iface->dev.parent);
 448         kfree(iface);
 449         return NULL;
 450 }
 451 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 452
 453 void iscsi_destroy_iface(struct iscsi_iface *iface)
 454 {
 455         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 456         device_unregister(&iface->dev);
 457 }
 458 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 459
 460 /*
 461  * BSG support
 462  */
 463 /**
 464  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
 465  * @job: bsg job to be processed
 466  */
 467 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
 468 {
 469         struct Scsi_Host *shost = iscsi_job_to_shost(job);
 470         struct iscsi_bsg_request *req = job->request;
 471         struct iscsi_bsg_reply *reply = job->reply;
 472         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 473         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
 474         int ret;
 475
 476         /* check if we have the msgcode value at least */
 477         if (job->request_len < sizeof(uint32_t)) {
 478                 ret = -ENOMSG;
 479                 goto fail_host_msg;
 480         }
 481
 482         /* Validate the host command */
 483         switch (req->msgcode) {
 484         case ISCSI_BSG_HST_VENDOR:
 485                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
 486                 if ((shost->hostt->vendor_id == 0L) ||
 487                     (req->rqst_data.h_vendor.vendor_id !=
 488                         shost->hostt->vendor_id)) {
 489                         ret = -ESRCH;
 490                         goto fail_host_msg;
 491                 }
 492                 break;
 493         default:
 494                 ret = -EBADR;
 495                 goto fail_host_msg;
 496         }
 497
 498         /* check if we really have all the request data needed */
 499         if (job->request_len < cmdlen) {
 500                 ret = -ENOMSG;
 501                 goto fail_host_msg;
 502         }
 503
 504         ret = i->iscsi_transport->bsg_request(job);
 505         if (!ret)
 506                 return 0;
 507
 508 fail_host_msg:
 509         /* return the errno failure code as the only status */
 510         BUG_ON(job->reply_len < sizeof(uint32_t));
 511         reply->reply_payload_rcv_len = 0;
 512         reply->result = ret;
 513         job->reply_len = sizeof(uint32_t);
 514         bsg_job_done(job, ret, 0);
 515         return 0;
 516 }
 517
 518 /**
 519  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
 520  * @shost: shost for iscsi_host
 521  * @cls_host: iscsi_cls_host adding the structures to
 522  */
 523 static int
 524 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
 525 {
 526         struct device *dev = &shost->shost_gendev;
 527         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 528         struct request_queue *q;
 529         char bsg_name[20];
 530         int ret;
 531
 532         if (!i->iscsi_transport->bsg_request)
 533                 return -ENOTSUPP;
 534
 535         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
 536
 537         q = __scsi_alloc_queue(shost, bsg_request_fn);
 538         if (!q)
 539                 return -ENOMEM;
 540
 541         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
 542         if (ret) {
 543                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
 544                              "initialize - no request queue\n");
 545                 blk_cleanup_queue(q);
 546                 return ret;
 547         }
 548
 549         ihost->bsg_q = q;
 550         return 0;
 551 }
 552
 553 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 554                             struct device *cdev)
 555 {
 556         struct Scsi_Host *shost = dev_to_shost(dev);
 557         struct iscsi_cls_host *ihost = shost->shost_data;
 558
 559         memset(ihost, 0, sizeof(*ihost));
 560         atomic_set(&ihost->nr_scans, 0);
 561         mutex_init(&ihost->mutex);
 562
 563         iscsi_bsg_host_add(shost, ihost);
 564         /* ignore any bsg add error - we just can't do sgio */
 565
 566         return 0;
 567 }
 568
 569 static int iscsi_remove_host(struct transport_container *tc,
 570                              struct device *dev, struct device *cdev)
 571 {
 572         struct Scsi_Host *shost = dev_to_shost(dev);
 573         struct iscsi_cls_host *ihost = shost->shost_data;
 574
 575         if (ihost->bsg_q) {
 576                 bsg_remove_queue(ihost->bsg_q);
 577                 blk_cleanup_queue(ihost->bsg_q);
 578         }
 579         return 0;
 580 }
 581
 582 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 583                                "iscsi_host",
 584                                iscsi_setup_host,
 585                                iscsi_remove_host,
 586                                NULL);
 587
 588 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 589                                "iscsi_session",
 590                                NULL,
 591                                NULL,
 592                                NULL);
 593
 594 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 595                                "iscsi_connection",
 596                                NULL,
 597                                NULL,
 598                                NULL);
 599
 600 static struct sock *nls;
 601 static DEFINE_MUTEX(rx_queue_mutex);
 602
 603 static LIST_HEAD(sesslist);
 604 static DEFINE_SPINLOCK(sesslock);
 605 static LIST_HEAD(connlist);
 606 static DEFINE_SPINLOCK(connlock);
 607
 608 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 609 {
 610         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 611         return sess->sid;
 612 }
 613
 614 /*
 615  * Returns the matching session to a given sid
 616  */
 617 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 618 {
 619         unsigned long flags;
 620         struct iscsi_cls_session *sess;
 621
 622         spin_lock_irqsave(&sesslock, flags);
 623         list_for_each_entry(sess, &sesslist, sess_list) {
 624                 if (sess->sid == sid) {
 625                         spin_unlock_irqrestore(&sesslock, flags);
 626                         return sess;
 627                 }
 628         }
 629         spin_unlock_irqrestore(&sesslock, flags);
 630         return NULL;
 631 }
 632
 633 /*
 634  * Returns the matching connection to a given sid / cid tuple
 635  */
 636 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 637 {
 638         unsigned long flags;
 639         struct iscsi_cls_conn *conn;
 640
 641         spin_lock_irqsave(&connlock, flags);
 642         list_for_each_entry(conn, &connlist, conn_list) {
 643                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 644                         spin_unlock_irqrestore(&connlock, flags);
 645                         return conn;
 646                 }
 647         }
 648         spin_unlock_irqrestore(&connlock, flags);
 649         return NULL;
 650 }
 651
 652 /*
 653  * The following functions can be used by LLDs that allocate
 654  * their own scsi_hosts or by software iscsi LLDs
 655  */
 656 static struct {
 657         int value;
 658         char *name;
 659 } iscsi_session_state_names[] = {
 660         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 661         { ISCSI_SESSION_FAILED,         "FAILED" },
 662         { ISCSI_SESSION_FREE,           "FREE" },
 663 };
 664
 665 static const char *iscsi_session_state_name(int state)
 666 {
 667         int i;
 668         char *name = NULL;
 669
 670         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 671                 if (iscsi_session_state_names[i].value == state) {
 672                         name = iscsi_session_state_names[i].name;
 673                         break;
 674                 }
 675         }
 676         return name;
 677 }
 678
 679 int iscsi_session_chkready(struct iscsi_cls_session *session)
 680 {
 681         unsigned long flags;
 682         int err;
 683
 684         spin_lock_irqsave(&session->lock, flags);
 685         switch (session->state) {
 686         case ISCSI_SESSION_LOGGED_IN:
 687                 err = 0;
 688                 break;
 689         case ISCSI_SESSION_FAILED:
 690                 err = DID_IMM_RETRY << 16;
 691                 break;
 692         case ISCSI_SESSION_FREE:
 693                 err = DID_TRANSPORT_FAILFAST << 16;
 694                 break;
 695         default:
 696                 err = DID_NO_CONNECT << 16;
 697                 break;
 698         }
 699         spin_unlock_irqrestore(&session->lock, flags);
 700         return err;
 701 }
 702 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 703
 704 int iscsi_is_session_online(struct iscsi_cls_session *session)
 705 {
 706         unsigned long flags;
 707         int ret = 0;
 708
 709         spin_lock_irqsave(&session->lock, flags);
 710         if (session->state == ISCSI_SESSION_LOGGED_IN)
 711                 ret = 1;
 712         spin_unlock_irqrestore(&session->lock, flags);
 713         return ret;
 714 }
 715 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
 716
 717 static void iscsi_session_release(struct device *dev)
 718 {
 719         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 720         struct Scsi_Host *shost;
 721
 722         shost = iscsi_session_to_shost(session);
 723         scsi_host_put(shost);
 724         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 725         kfree(session);
 726 }
 727
 728 static int iscsi_is_session_dev(const struct device *dev)
 729 {
 730         return dev->release == iscsi_session_release;
 731 }
 732
 733 static int iscsi_iter_session_fn(struct device *dev, void *data)
 734 {
 735         void (* fn) (struct iscsi_cls_session *) = data;
 736
 737         if (!iscsi_is_session_dev(dev))
 738                 return 0;
 739         fn(iscsi_dev_to_session(dev));
 740         return 0;
 741 }
 742
 743 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 744                                  void (*fn)(struct iscsi_cls_session *))
 745 {
 746         device_for_each_child(&shost->shost_gendev, fn,
 747                               iscsi_iter_session_fn);
 748 }
 749 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 750
 751 /**
 752  * iscsi_scan_finished - helper to report when running scans are done
 753  * @shost: scsi host
 754  * @time: scan run time
 755  *
 756  * This function can be used by drives like qla4xxx to report to the scsi
 757  * layer when the scans it kicked off at module load time are done.
 758  */
 759 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 760 {
 761         struct iscsi_cls_host *ihost = shost->shost_data;
 762         /*
 763          * qla4xxx will have kicked off some session unblocks before calling
 764          * scsi_scan_host, so just wait for them to complete.
 765          */
 766         return !atomic_read(&ihost->nr_scans);
 767 }
 768 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 769
 770 struct iscsi_scan_data {
 771         unsigned int channel;
 772         unsigned int id;
 773         unsigned int lun;
 774 };
 775
 776 static int iscsi_user_scan_session(struct device *dev, void *data)
 777 {
 778         struct iscsi_scan_data *scan_data = data;
 779         struct iscsi_cls_session *session;
 780         struct Scsi_Host *shost;
 781         struct iscsi_cls_host *ihost;
 782         unsigned long flags;
 783         unsigned int id;
 784
 785         if (!iscsi_is_session_dev(dev))
 786                 return 0;
 787
 788         session = iscsi_dev_to_session(dev);
 789
 790         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 791
 792         shost = iscsi_session_to_shost(session);
 793         ihost = shost->shost_data;
 794
 795         mutex_lock(&ihost->mutex);
 796         spin_lock_irqsave(&session->lock, flags);
 797         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 798                 spin_unlock_irqrestore(&session->lock, flags);
 799                 goto user_scan_exit;
 800         }
 801         id = session->target_id;
 802         spin_unlock_irqrestore(&session->lock, flags);
 803
 804         if (id != ISCSI_MAX_TARGET) {
 805                 if ((scan_data->channel == SCAN_WILD_CARD ||
 806                      scan_data->channel == 0) &&
 807                     (scan_data->id == SCAN_WILD_CARD ||
 808                      scan_data->id == id))
 809                         scsi_scan_target(&session->dev, 0, id,
 810                                          scan_data->lun, 1);
 811         }
 812
 813 user_scan_exit:
 814         mutex_unlock(&ihost->mutex);
 815         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 816         return 0;
 817 }
 818
 819 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 820                            uint id, uint lun)
 821 {
 822         struct iscsi_scan_data scan_data;
 823
 824         scan_data.channel = channel;
 825         scan_data.id = id;
 826         scan_data.lun = lun;
 827
 828         return device_for_each_child(&shost->shost_gendev, &scan_data,
 829                                      iscsi_user_scan_session);
 830 }
 831
 832 static void iscsi_scan_session(struct work_struct *work)
 833 {
 834         struct iscsi_cls_session *session =
 835                         container_of(work, struct iscsi_cls_session, scan_work);
 836         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 837         struct iscsi_cls_host *ihost = shost->shost_data;
 838         struct iscsi_scan_data scan_data;
 839
 840         scan_data.channel = 0;
 841         scan_data.id = SCAN_WILD_CARD;
 842         scan_data.lun = SCAN_WILD_CARD;
 843
 844         iscsi_user_scan_session(&session->dev, &scan_data);
 845         atomic_dec(&ihost->nr_scans);
 846 }
 847
 848 /**
 849  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 850  * @cmd: scsi cmd passed to scsi eh handler
 851  *
 852  * If the session is down this function will wait for the recovery
 853  * timer to fire or for the session to be logged back in. If the
 854  * recovery timer fires then FAST_IO_FAIL is returned. The caller
 855  * should pass this error value to the scsi eh.
 856  */
 857 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 858 {
 859         struct iscsi_cls_session *session =
 860                         starget_to_session(scsi_target(cmd->device));
 861         unsigned long flags;
 862         int ret = 0;
 863
 864         spin_lock_irqsave(&session->lock, flags);
 865         while (session->state != ISCSI_SESSION_LOGGED_IN) {
 866                 if (session->state == ISCSI_SESSION_FREE) {
 867                         ret = FAST_IO_FAIL;
 868                         break;
 869                 }
 870                 spin_unlock_irqrestore(&session->lock, flags);
 871                 msleep(1000);
 872                 spin_lock_irqsave(&session->lock, flags);
 873         }
 874         spin_unlock_irqrestore(&session->lock, flags);
 875         return ret;
 876 }
 877 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 878
 879 static void session_recovery_timedout(struct work_struct *work)
 880 {
 881         struct iscsi_cls_session *session =
 882                 container_of(work, struct iscsi_cls_session,
 883                              recovery_work.work);
 884         unsigned long flags;
 885
 886         iscsi_cls_session_printk(KERN_INFO, session,
 887                                  "session recovery timed out after %d secs\n",
 888                                  session->recovery_tmo);
 889
 890         spin_lock_irqsave(&session->lock, flags);
 891         switch (session->state) {
 892         case ISCSI_SESSION_FAILED:
 893                 session->state = ISCSI_SESSION_FREE;
 894                 break;
 895         case ISCSI_SESSION_LOGGED_IN:
 896         case ISCSI_SESSION_FREE:
 897                 /* we raced with the unblock's flush */
 898                 spin_unlock_irqrestore(&session->lock, flags);
 899                 return;
 900         }
 901         spin_unlock_irqrestore(&session->lock, flags);
 902
 903         if (session->transport->session_recovery_timedout)
 904                 session->transport->session_recovery_timedout(session);
 905
 906         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 907         scsi_target_unblock(&session->dev);
 908         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 909 }
 910
 911 static void __iscsi_unblock_session(struct work_struct *work)
 912 {
 913         struct iscsi_cls_session *session =
 914                         container_of(work, struct iscsi_cls_session,
 915                                      unblock_work);
 916         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 917         struct iscsi_cls_host *ihost = shost->shost_data;
 918         unsigned long flags;
 919
 920         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 921         /*
 922          * The recovery and unblock work get run from the same workqueue,
 923          * so try to cancel it if it was going to run after this unblock.
 924          */
 925         cancel_delayed_work(&session->recovery_work);
 926         spin_lock_irqsave(&session->lock, flags);
 927         session->state = ISCSI_SESSION_LOGGED_IN;
 928         spin_unlock_irqrestore(&session->lock, flags);
 929         /* start IO */
 930         scsi_target_unblock(&session->dev);
 931         /*
 932          * Only do kernel scanning if the driver is properly hooked into
 933          * the async scanning code (drivers like iscsi_tcp do login and
 934          * scanning from userspace).
 935          */
 936         if (shost->hostt->scan_finished) {
 937                 if (scsi_queue_work(shost, &session->scan_work))
 938                         atomic_inc(&ihost->nr_scans);
 939         }
 940         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 941 }
 942
 943 /**
 944  * iscsi_unblock_session - set a session as logged in and start IO.
 945  * @session: iscsi session
 946  *
 947  * Mark a session as ready to accept IO.
 948  */
 949 void iscsi_unblock_session(struct iscsi_cls_session *session)
 950 {
 951         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 952         /*
 953          * make sure all the events have completed before tell the driver
 954          * it is safe
 955          */
 956         flush_workqueue(iscsi_eh_timer_workq);
 957 }
 958 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 959
 960 static void __iscsi_block_session(struct work_struct *work)
 961 {
 962         struct iscsi_cls_session *session =
 963                         container_of(work, struct iscsi_cls_session,
 964                                      block_work);
 965         unsigned long flags;
 966
 967         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 968         spin_lock_irqsave(&session->lock, flags);
 969         session->state = ISCSI_SESSION_FAILED;
 970         spin_unlock_irqrestore(&session->lock, flags);
 971         scsi_target_block(&session->dev);
 972         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 973         if (session->recovery_tmo >= 0)
 974                 queue_delayed_work(iscsi_eh_timer_workq,
 975                                    &session->recovery_work,
 976                                    session->recovery_tmo * HZ);
 977 }
 978
 979 void iscsi_block_session(struct iscsi_cls_session *session)
 980 {
 981         queue_work(iscsi_eh_timer_workq, &session->block_work);
 982 }
 983 EXPORT_SYMBOL_GPL(iscsi_block_session);
 984
 985 static void __iscsi_unbind_session(struct work_struct *work)
 986 {
 987         struct iscsi_cls_session *session =
 988                         container_of(work, struct iscsi_cls_session,
 989                                      unbind_work);
 990         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 991         struct iscsi_cls_host *ihost = shost->shost_data;
 992         unsigned long flags;
 993
 994         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 995
 996         /* Prevent new scans and make sure scanning is not in progress */
 997         mutex_lock(&ihost->mutex);
 998         spin_lock_irqsave(&session->lock, flags);
 999         if (session->target_id == ISCSI_MAX_TARGET) {
1000                 spin_unlock_irqrestore(&session->lock, flags);
1001                 mutex_unlock(&ihost->mutex);
1002                 return;
1003         }
1004         session->target_id = ISCSI_MAX_TARGET;
1005         spin_unlock_irqrestore(&session->lock, flags);
1006         mutex_unlock(&ihost->mutex);
1007
1008         scsi_remove_target(&session->dev);
1009         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1010         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1011 }
1012
1013 struct iscsi_cls_session *
1014 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1015                     int dd_size)
1016 {
1017         struct iscsi_cls_session *session;
1018
1019         session = kzalloc(sizeof(*session) + dd_size,
1020                           GFP_KERNEL);
1021         if (!session)
1022                 return NULL;
1023
1024         session->transport = transport;
1025         session->recovery_tmo = 120;
1026         session->state = ISCSI_SESSION_FREE;
1027         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1028         INIT_LIST_HEAD(&session->sess_list);
1029         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1030         INIT_WORK(&session->block_work, __iscsi_block_session);
1031         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1032         INIT_WORK(&session->scan_work, iscsi_scan_session);
1033         spin_lock_init(&session->lock);
1034
1035         /* this is released in the dev's release function */
1036         scsi_host_get(shost);
1037         session->dev.parent = &shost->shost_gendev;
1038         session->dev.release = iscsi_session_release;
1039         device_initialize(&session->dev);
1040         if (dd_size)
1041                 session->dd_data = &session[1];
1042
1043         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1044         return session;
1045 }
1046 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1047
1048 static int iscsi_get_next_target_id(struct device *dev, void *data)
1049 {
1050         struct iscsi_cls_session *session;
1051         unsigned long flags;
1052         int err = 0;
1053
1054         if (!iscsi_is_session_dev(dev))
1055                 return 0;
1056
1057         session = iscsi_dev_to_session(dev);
1058         spin_lock_irqsave(&session->lock, flags);
1059         if (*((unsigned int *) data) == session->target_id)
1060                 err = -EEXIST;
1061         spin_unlock_irqrestore(&session->lock, flags);
1062         return err;
1063 }
1064
1065 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1066 {
1067         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1068         struct iscsi_cls_host *ihost;
1069         unsigned long flags;
1070         unsigned int id = target_id;
1071         int err;
1072
1073         ihost = shost->shost_data;
1074         session->sid = atomic_add_return(1, &iscsi_session_nr);
1075
1076         if (id == ISCSI_MAX_TARGET) {
1077                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
1078                         err = device_for_each_child(&shost->shost_gendev, &id,
1079                                                     iscsi_get_next_target_id);
1080                         if (!err)
1081                                 break;
1082                 }
1083
1084                 if (id == ISCSI_MAX_TARGET) {
1085                         iscsi_cls_session_printk(KERN_ERR, session,
1086                                                  "Too many iscsi targets. Max "
1087                                                  "number of targets is %d.\n",
1088                                                  ISCSI_MAX_TARGET - 1);
1089                         err = -EOVERFLOW;
1090                         goto release_host;
1091                 }
1092         }
1093         session->target_id = id;
1094
1095         dev_set_name(&session->dev, "session%u", session->sid);
1096         err = device_add(&session->dev);
1097         if (err) {
1098                 iscsi_cls_session_printk(KERN_ERR, session,
1099                                          "could not register session's dev\n");
1100                 goto release_host;
1101         }
1102         transport_register_device(&session->dev);
1103
1104         spin_lock_irqsave(&sesslock, flags);
1105         list_add(&session->sess_list, &sesslist);
1106         spin_unlock_irqrestore(&sesslock, flags);
1107
1108         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1109         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1110         return 0;
1111
1112 release_host:
1113         scsi_host_put(shost);
1114         return err;
1115 }
1116 EXPORT_SYMBOL_GPL(iscsi_add_session);
1117
1118 /**
1119  * iscsi_create_session - create iscsi class session
1120  * @shost: scsi host
1121  * @transport: iscsi transport
1122  * @dd_size: private driver data size
1123  * @target_id: which target
1124  *
1125  * This can be called from a LLD or iscsi_transport.
1126  */
1127 struct iscsi_cls_session *
1128 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1129                      int dd_size, unsigned int target_id)
1130 {
1131         struct iscsi_cls_session *session;
1132
1133         session = iscsi_alloc_session(shost, transport, dd_size);
1134         if (!session)
1135                 return NULL;
1136
1137         if (iscsi_add_session(session, target_id)) {
1138                 iscsi_free_session(session);
1139                 return NULL;
1140         }
1141         return session;
1142 }
1143 EXPORT_SYMBOL_GPL(iscsi_create_session);
1144
1145 static void iscsi_conn_release(struct device *dev)
1146 {
1147         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1148         struct device *parent = conn->dev.parent;
1149
1150         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1151         kfree(conn);
1152         put_device(parent);
1153 }
1154
1155 static int iscsi_is_conn_dev(const struct device *dev)
1156 {
1157         return dev->release == iscsi_conn_release;
1158 }
1159
1160 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1161 {
1162         if (!iscsi_is_conn_dev(dev))
1163                 return 0;
1164         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1165 }
1166
1167 void iscsi_remove_session(struct iscsi_cls_session *session)
1168 {
1169         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1170         unsigned long flags;
1171         int err;
1172
1173         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1174
1175         spin_lock_irqsave(&sesslock, flags);
1176         list_del(&session->sess_list);
1177         spin_unlock_irqrestore(&sesslock, flags);
1178
1179         /* make sure there are no blocks/unblocks queued */
1180         flush_workqueue(iscsi_eh_timer_workq);
1181         /* make sure the timedout callout is not running */
1182         if (!cancel_delayed_work(&session->recovery_work))
1183                 flush_workqueue(iscsi_eh_timer_workq);
1184         /*
1185          * If we are blocked let commands flow again. The lld or iscsi
1186          * layer should set up the queuecommand to fail commands.
1187          * We assume that LLD will not be calling block/unblock while
1188          * removing the session.
1189          */
1190         spin_lock_irqsave(&session->lock, flags);
1191         session->state = ISCSI_SESSION_FREE;
1192         spin_unlock_irqrestore(&session->lock, flags);
1193
1194         scsi_target_unblock(&session->dev);
1195         /* flush running scans then delete devices */
1196         scsi_flush_work(shost);
1197         __iscsi_unbind_session(&session->unbind_work);
1198
1199         /* hw iscsi may not have removed all connections from session */
1200         err = device_for_each_child(&session->dev, NULL,
1201                                     iscsi_iter_destroy_conn_fn);
1202         if (err)
1203                 iscsi_cls_session_printk(KERN_ERR, session,
1204                                          "Could not delete all connections "
1205                                          "for session. Error %d.\n", err);
1206
1207         transport_unregister_device(&session->dev);
1208
1209         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1210         device_del(&session->dev);
1211 }
1212 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1213
1214 void iscsi_free_session(struct iscsi_cls_session *session)
1215 {
1216         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1217         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1218         put_device(&session->dev);
1219 }
1220 EXPORT_SYMBOL_GPL(iscsi_free_session);
1221
1222 /**
1223  * iscsi_destroy_session - destroy iscsi session
1224  * @session: iscsi_session
1225  *
1226  * Can be called by a LLD or iscsi_transport. There must not be
1227  * any running connections.
1228  */
1229 int iscsi_destroy_session(struct iscsi_cls_session *session)
1230 {
1231         iscsi_remove_session(session);
1232         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1233         iscsi_free_session(session);
1234         return 0;
1235 }
1236 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1237
1238 /**
1239  * iscsi_create_conn - create iscsi class connection
1240  * @session: iscsi cls session
1241  * @dd_size: private driver data size
1242  * @cid: connection id
1243  *
1244  * This can be called from a LLD or iscsi_transport. The connection
1245  * is child of the session so cid must be unique for all connections
1246  * on the session.
1247  *
1248  * Since we do not support MCS, cid will normally be zero. In some cases
1249  * for software iscsi we could be trying to preallocate a connection struct
1250  * in which case there could be two connection structs and cid would be
1251  * non-zero.
1252  */
1253 struct iscsi_cls_conn *
1254 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1255 {
1256         struct iscsi_transport *transport = session->transport;
1257         struct iscsi_cls_conn *conn;
1258         unsigned long flags;
1259         int err;
1260
1261         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1262         if (!conn)
1263                 return NULL;
1264         if (dd_size)
1265                 conn->dd_data = &conn[1];
1266
1267         mutex_init(&conn->ep_mutex);
1268         INIT_LIST_HEAD(&conn->conn_list);
1269         conn->transport = transport;
1270         conn->cid = cid;
1271
1272         /* this is released in the dev's release function */
1273         if (!get_device(&session->dev))
1274                 goto free_conn;
1275
1276         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1277         conn->dev.parent = &session->dev;
1278         conn->dev.release = iscsi_conn_release;
1279         err = device_register(&conn->dev);
1280         if (err) {
1281                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1282                                          "register connection's dev\n");
1283                 goto release_parent_ref;
1284         }
1285         transport_register_device(&conn->dev);
1286
1287         spin_lock_irqsave(&connlock, flags);
1288         list_add(&conn->conn_list, &connlist);
1289         spin_unlock_irqrestore(&connlock, flags);
1290
1291         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1292         return conn;
1293
1294 release_parent_ref:
1295         put_device(&session->dev);
1296 free_conn:
1297         kfree(conn);
1298         return NULL;
1299 }
1300
1301 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1302
1303 /**
1304  * iscsi_destroy_conn - destroy iscsi class connection
1305  * @conn: iscsi cls session
1306  *
1307  * This can be called from a LLD or iscsi_transport.
1308  */
1309 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1310 {
1311         unsigned long flags;
1312
1313         spin_lock_irqsave(&connlock, flags);
1314         list_del(&conn->conn_list);
1315         spin_unlock_irqrestore(&connlock, flags);
1316
1317         transport_unregister_device(&conn->dev);
1318         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1319         device_unregister(&conn->dev);
1320         return 0;
1321 }
1322 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1323
1324 /*
1325  * iscsi interface functions
1326  */
1327 static struct iscsi_internal *
1328 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1329 {
1330         struct iscsi_internal *priv;
1331         unsigned long flags;
1332
1333         spin_lock_irqsave(&iscsi_transport_lock, flags);
1334         list_for_each_entry(priv, &iscsi_transports, list) {
1335                 if (tt == priv->iscsi_transport) {
1336                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1337                         return priv;
1338                 }
1339         }
1340         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1341         return NULL;
1342 }
1343
1344 static int
1345 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1346 {
1347         return nlmsg_multicast(nls, skb, 0, group, gfp);
1348 }
1349
1350 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1351                    char *data, uint32_t data_size)
1352 {
1353         struct nlmsghdr *nlh;
1354         struct sk_buff *skb;
1355         struct iscsi_uevent *ev;
1356         char *pdu;
1357         struct iscsi_internal *priv;
1358         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1359                               data_size);
1360
1361         priv = iscsi_if_transport_lookup(conn->transport);
1362         if (!priv)
1363                 return -EINVAL;
1364
1365         skb = alloc_skb(len, GFP_ATOMIC);
1366         if (!skb) {
1367                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1368                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1369                                       "control PDU: OOM\n");
1370                 return -ENOMEM;
1371         }
1372
1373         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1374         ev = NLMSG_DATA(nlh);
1375         memset(ev, 0, sizeof(*ev));
1376         ev->transport_handle = iscsi_handle(conn->transport);
1377         ev->type = ISCSI_KEVENT_RECV_PDU;
1378         ev->r.recv_req.cid = conn->cid;
1379         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1380         pdu = (char*)ev + sizeof(*ev);
1381         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1382         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1383
1384         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1385 }
1386 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1387
1388 int iscsi_offload_mesg(struct Scsi_Host *shost,
1389                        struct iscsi_transport *transport, uint32_t type,
1390                        char *data, uint16_t data_size)
1391 {
1392         struct nlmsghdr *nlh;
1393         struct sk_buff *skb;
1394         struct iscsi_uevent *ev;
1395         int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1396
1397         skb = alloc_skb(len, GFP_ATOMIC);
1398         if (!skb) {
1399                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1400                 return -ENOMEM;
1401         }
1402
1403         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1404         ev = NLMSG_DATA(nlh);
1405         memset(ev, 0, sizeof(*ev));
1406         ev->type = type;
1407         ev->transport_handle = iscsi_handle(transport);
1408         switch (type) {
1409         case ISCSI_KEVENT_PATH_REQ:
1410                 ev->r.req_path.host_no = shost->host_no;
1411                 break;
1412         case ISCSI_KEVENT_IF_DOWN:
1413                 ev->r.notify_if_down.host_no = shost->host_no;
1414                 break;
1415         }
1416
1417         memcpy((char *)ev + sizeof(*ev), data, data_size);
1418
1419         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1420 }
1421 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1422
1423 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1424 {
1425         struct nlmsghdr *nlh;
1426         struct sk_buff  *skb;
1427         struct iscsi_uevent *ev;
1428         struct iscsi_internal *priv;
1429         int len = NLMSG_SPACE(sizeof(*ev));
1430
1431         priv = iscsi_if_transport_lookup(conn->transport);
1432         if (!priv)
1433                 return;
1434
1435         skb = alloc_skb(len, GFP_ATOMIC);
1436         if (!skb) {
1437                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1438                                       "conn error (%d)\n", error);
1439                 return;
1440         }
1441
1442         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1443         ev = NLMSG_DATA(nlh);
1444         ev->transport_handle = iscsi_handle(conn->transport);
1445         ev->type = ISCSI_KEVENT_CONN_ERROR;
1446         ev->r.connerror.error = error;
1447         ev->r.connerror.cid = conn->cid;
1448         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1449
1450         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1451
1452         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1453                               error);
1454 }
1455 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1456
1457 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1458                             enum iscsi_conn_state state)
1459 {
1460         struct nlmsghdr *nlh;
1461         struct sk_buff  *skb;
1462         struct iscsi_uevent *ev;
1463         struct iscsi_internal *priv;
1464         int len = NLMSG_SPACE(sizeof(*ev));
1465
1466         priv = iscsi_if_transport_lookup(conn->transport);
1467         if (!priv)
1468                 return;
1469
1470         skb = alloc_skb(len, GFP_ATOMIC);
1471         if (!skb) {
1472                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1473                                       "conn login (%d)\n", state);
1474                 return;
1475         }
1476
1477         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1478         ev = NLMSG_DATA(nlh);
1479         ev->transport_handle = iscsi_handle(conn->transport);
1480         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1481         ev->r.conn_login.state = state;
1482         ev->r.conn_login.cid = conn->cid;
1483         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1484         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1485
1486         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1487                               state);
1488 }
1489 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1490
1491 static int
1492 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1493                     void *payload, int size)
1494 {
1495         struct sk_buff  *skb;
1496         struct nlmsghdr *nlh;
1497         int len = NLMSG_SPACE(size);
1498         int flags = multi ? NLM_F_MULTI : 0;
1499         int t = done ? NLMSG_DONE : type;
1500
1501         skb = alloc_skb(len, GFP_ATOMIC);
1502         if (!skb) {
1503                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1504                 return -ENOMEM;
1505         }
1506
1507         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1508         nlh->nlmsg_flags = flags;
1509         memcpy(NLMSG_DATA(nlh), payload, size);
1510         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1511 }
1512
1513 static int
1514 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1515 {
1516         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1517         struct iscsi_stats *stats;
1518         struct sk_buff *skbstat;
1519         struct iscsi_cls_conn *conn;
1520         struct nlmsghdr *nlhstat;
1521         struct iscsi_uevent *evstat;
1522         struct iscsi_internal *priv;
1523         int len = NLMSG_SPACE(sizeof(*ev) +
1524                               sizeof(struct iscsi_stats) +
1525                               sizeof(struct iscsi_stats_custom) *
1526                               ISCSI_STATS_CUSTOM_MAX);
1527         int err = 0;
1528
1529         priv = iscsi_if_transport_lookup(transport);
1530         if (!priv)
1531                 return -EINVAL;
1532
1533         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1534         if (!conn)
1535                 return -EEXIST;
1536
1537         do {
1538                 int actual_size;
1539
1540                 skbstat = alloc_skb(len, GFP_ATOMIC);
1541                 if (!skbstat) {
1542                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1543                                               "deliver stats: OOM\n");
1544                         return -ENOMEM;
1545                 }
1546
1547                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1548                                       (len - sizeof(*nlhstat)), 0);
1549                 evstat = NLMSG_DATA(nlhstat);
1550                 memset(evstat, 0, sizeof(*evstat));
1551                 evstat->transport_handle = iscsi_handle(conn->transport);
1552                 evstat->type = nlh->nlmsg_type;
1553                 evstat->u.get_stats.cid =
1554                         ev->u.get_stats.cid;
1555                 evstat->u.get_stats.sid =
1556                         ev->u.get_stats.sid;
1557                 stats = (struct iscsi_stats *)
1558                         ((char*)evstat + sizeof(*evstat));
1559                 memset(stats, 0, sizeof(*stats));
1560
1561                 transport->get_stats(conn, stats);
1562                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1563                                           sizeof(struct iscsi_stats) +
1564                                           sizeof(struct iscsi_stats_custom) *
1565                                           stats->custom_length);
1566                 actual_size -= sizeof(*nlhstat);
1567                 actual_size = NLMSG_LENGTH(actual_size);
1568                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1569                 nlhstat->nlmsg_len = actual_size;
1570
1571                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1572                                           GFP_ATOMIC);
1573         } while (err < 0 && err != -ECONNREFUSED);
1574
1575         return err;
1576 }
1577
1578 /**
1579  * iscsi_session_event - send session destr. completion event
1580  * @session: iscsi class session
1581  * @event: type of event
1582  */
1583 int iscsi_session_event(struct iscsi_cls_session *session,
1584                         enum iscsi_uevent_e event)
1585 {
1586         struct iscsi_internal *priv;
1587         struct Scsi_Host *shost;
1588         struct iscsi_uevent *ev;
1589         struct sk_buff  *skb;
1590         struct nlmsghdr *nlh;
1591         int rc, len = NLMSG_SPACE(sizeof(*ev));
1592
1593         priv = iscsi_if_transport_lookup(session->transport);
1594         if (!priv)
1595                 return -EINVAL;
1596         shost = iscsi_session_to_shost(session);
1597
1598         skb = alloc_skb(len, GFP_KERNEL);
1599         if (!skb) {
1600                 iscsi_cls_session_printk(KERN_ERR, session,
1601                                          "Cannot notify userspace of session "
1602                                          "event %u\n", event);
1603                 return -ENOMEM;
1604         }
1605
1606         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1607         ev = NLMSG_DATA(nlh);
1608         ev->transport_handle = iscsi_handle(session->transport);
1609
1610         ev->type = event;
1611         switch (event) {
1612         case ISCSI_KEVENT_DESTROY_SESSION:
1613                 ev->r.d_session.host_no = shost->host_no;
1614                 ev->r.d_session.sid = session->sid;
1615                 break;
1616         case ISCSI_KEVENT_CREATE_SESSION:
1617                 ev->r.c_session_ret.host_no = shost->host_no;
1618                 ev->r.c_session_ret.sid = session->sid;
1619                 break;
1620         case ISCSI_KEVENT_UNBIND_SESSION:
1621                 ev->r.unbind_session.host_no = shost->host_no;
1622                 ev->r.unbind_session.sid = session->sid;
1623                 break;
1624         default:
1625                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1626                                          "%u.\n", event);
1627                 kfree_skb(skb);
1628                 return -EINVAL;
1629         }
1630
1631         /*
1632          * this will occur if the daemon is not up, so we just warn
1633          * the user and when the daemon is restarted it will handle it
1634          */
1635         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1636         if (rc == -ESRCH)
1637                 iscsi_cls_session_printk(KERN_ERR, session,
1638                                          "Cannot notify userspace of session "
1639                                          "event %u. Check iscsi daemon\n",
1640                                          event);
1641
1642         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1643                                 event, rc);
1644         return rc;
1645 }
1646 EXPORT_SYMBOL_GPL(iscsi_session_event);
1647
1648 static int
1649 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1650                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1651                         uint16_t cmds_max, uint16_t queue_depth)
1652 {
1653         struct iscsi_transport *transport = priv->iscsi_transport;
1654         struct iscsi_cls_session *session;
1655         struct Scsi_Host *shost;
1656
1657         session = transport->create_session(ep, cmds_max, queue_depth,
1658                                             initial_cmdsn);
1659         if (!session)
1660                 return -ENOMEM;
1661
1662         shost = iscsi_session_to_shost(session);
1663         ev->r.c_session_ret.host_no = shost->host_no;
1664         ev->r.c_session_ret.sid = session->sid;
1665         ISCSI_DBG_TRANS_SESSION(session,
1666                                 "Completed creating transport session\n");
1667         return 0;
1668 }
1669
1670 static int
1671 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1672 {
1673         struct iscsi_cls_conn *conn;
1674         struct iscsi_cls_session *session;
1675
1676         session = iscsi_session_lookup(ev->u.c_conn.sid);
1677         if (!session) {
1678                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1679                        ev->u.c_conn.sid);
1680                 return -EINVAL;
1681         }
1682
1683         conn = transport->create_conn(session, ev->u.c_conn.cid);
1684         if (!conn) {
1685                 iscsi_cls_session_printk(KERN_ERR, session,
1686                                          "couldn't create a new connection.");
1687                 return -ENOMEM;
1688         }
1689
1690         ev->r.c_conn_ret.sid = session->sid;
1691         ev->r.c_conn_ret.cid = conn->cid;
1692
1693         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1694         return 0;
1695 }
1696
1697 static int
1698 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1699 {
1700         struct iscsi_cls_conn *conn;
1701
1702         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1703         if (!conn)
1704                 return -EINVAL;
1705
1706         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1707         if (transport->destroy_conn)
1708                 transport->destroy_conn(conn);
1709
1710         return 0;
1711 }
1712
1713 static int
1714 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1715 {
1716         char *data = (char*)ev + sizeof(*ev);
1717         struct iscsi_cls_conn *conn;
1718         struct iscsi_cls_session *session;
1719         int err = 0, value = 0;
1720
1721         session = iscsi_session_lookup(ev->u.set_param.sid);
1722         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1723         if (!conn || !session)
1724                 return -EINVAL;
1725
1726         switch (ev->u.set_param.param) {
1727         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1728                 sscanf(data, "%d", &value);
1729                 session->recovery_tmo = value;
1730                 break;
1731         default:
1732                 err = transport->set_param(conn, ev->u.set_param.param,
1733                                            data, ev->u.set_param.len);
1734         }
1735
1736         return err;
1737 }
1738
1739 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1740                                struct iscsi_uevent *ev, int msg_type)
1741 {
1742         struct iscsi_endpoint *ep;
1743         struct sockaddr *dst_addr;
1744         struct Scsi_Host *shost = NULL;
1745         int non_blocking, err = 0;
1746
1747         if (!transport->ep_connect)
1748                 return -EINVAL;
1749
1750         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1751                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1752                 if (!shost) {
1753                         printk(KERN_ERR "ep connect failed. Could not find "
1754                                "host no %u\n",
1755                                ev->u.ep_connect_through_host.host_no);
1756                         return -ENODEV;
1757                 }
1758                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1759         } else
1760                 non_blocking = ev->u.ep_connect.non_blocking;
1761
1762         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1763         ep = transport->ep_connect(shost, dst_addr, non_blocking);
1764         if (IS_ERR(ep)) {
1765                 err = PTR_ERR(ep);
1766                 goto release_host;
1767         }
1768
1769         ev->r.ep_connect_ret.handle = ep->id;
1770 release_host:
1771         if (shost)
1772                 scsi_host_put(shost);
1773         return err;
1774 }
1775
1776 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1777                                   u64 ep_handle)
1778 {
1779         struct iscsi_cls_conn *conn;
1780         struct iscsi_endpoint *ep;
1781
1782         if (!transport->ep_disconnect)
1783                 return -EINVAL;
1784
1785         ep = iscsi_lookup_endpoint(ep_handle);
1786         if (!ep)
1787                 return -EINVAL;
1788         conn = ep->conn;
1789         if (conn) {
1790                 mutex_lock(&conn->ep_mutex);
1791                 conn->ep = NULL;
1792                 mutex_unlock(&conn->ep_mutex);
1793         }
1794
1795         transport->ep_disconnect(ep);
1796         return 0;
1797 }
1798
1799 static int
1800 iscsi_if_transport_ep(struct iscsi_transport *transport,
1801                       struct iscsi_uevent *ev, int msg_type)
1802 {
1803         struct iscsi_endpoint *ep;
1804         int rc = 0;
1805
1806         switch (msg_type) {
1807         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1808         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1809                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1810                 break;
1811         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1812                 if (!transport->ep_poll)
1813                         return -EINVAL;
1814
1815                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1816                 if (!ep)
1817                         return -EINVAL;
1818
1819                 ev->r.retcode = transport->ep_poll(ep,
1820                                                    ev->u.ep_poll.timeout_ms);
1821                 break;
1822         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1823                 rc = iscsi_if_ep_disconnect(transport,
1824                                             ev->u.ep_disconnect.ep_handle);
1825                 break;
1826         }
1827         return rc;
1828 }
1829
1830 static int
1831 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1832                 struct iscsi_uevent *ev)
1833 {
1834         struct Scsi_Host *shost;
1835         struct sockaddr *dst_addr;
1836         int err;
1837
1838         if (!transport->tgt_dscvr)
1839                 return -EINVAL;
1840
1841         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1842         if (!shost) {
1843                 printk(KERN_ERR "target discovery could not find host no %u\n",
1844                        ev->u.tgt_dscvr.host_no);
1845                 return -ENODEV;
1846         }
1847
1848
1849         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1850         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1851                                    ev->u.tgt_dscvr.enable, dst_addr);
1852         scsi_host_put(shost);
1853         return err;
1854 }
1855
1856 static int
1857 iscsi_set_host_param(struct iscsi_transport *transport,
1858                      struct iscsi_uevent *ev)
1859 {
1860         char *data = (char*)ev + sizeof(*ev);
1861         struct Scsi_Host *shost;
1862         int err;
1863
1864         if (!transport->set_host_param)
1865                 return -ENOSYS;
1866
1867         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1868         if (!shost) {
1869                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1870                        ev->u.set_host_param.host_no);
1871                 return -ENODEV;
1872         }
1873
1874         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1875                                         data, ev->u.set_host_param.len);
1876         scsi_host_put(shost);
1877         return err;
1878 }
1879
1880 static int
1881 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1882 {
1883         struct Scsi_Host *shost;
1884         struct iscsi_path *params;
1885         int err;
1886
1887         if (!transport->set_path)
1888                 return -ENOSYS;
1889
1890         shost = scsi_host_lookup(ev->u.set_path.host_no);
1891         if (!shost) {
1892                 printk(KERN_ERR "set path could not find host no %u\n",
1893                        ev->u.set_path.host_no);
1894                 return -ENODEV;
1895         }
1896
1897         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1898         err = transport->set_path(shost, params);
1899
1900         scsi_host_put(shost);
1901         return err;
1902 }
1903
1904 static int
1905 iscsi_set_iface_params(struct iscsi_transport *transport,
1906                        struct iscsi_uevent *ev)
1907 {
1908         char *data = (char *)ev + sizeof(*ev);
1909         struct Scsi_Host *shost;
1910         int err;
1911
1912         if (!transport->set_iface_param)
1913                 return -ENOSYS;
1914
1915         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1916         if (!shost) {
1917                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1918                        ev->u.set_iface_params.host_no);
1919                 return -ENODEV;
1920         }
1921
1922         err = transport->set_iface_param(shost, data,
1923                                          ev->u.set_iface_params.count);
1924         scsi_host_put(shost);
1925         return err;
1926 }
1927
1928 static int
1929 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1930 {
1931         int err = 0;
1932         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1933         struct iscsi_transport *transport = NULL;
1934         struct iscsi_internal *priv;
1935         struct iscsi_cls_session *session;
1936         struct iscsi_cls_conn *conn;
1937         struct iscsi_endpoint *ep = NULL;
1938
1939         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1940                 *group = ISCSI_NL_GRP_UIP;
1941         else
1942                 *group = ISCSI_NL_GRP_ISCSID;
1943
1944         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1945         if (!priv)
1946                 return -EINVAL;
1947         transport = priv->iscsi_transport;
1948
1949         if (!try_module_get(transport->owner))
1950                 return -EINVAL;
1951
1952         switch (nlh->nlmsg_type) {
1953         case ISCSI_UEVENT_CREATE_SESSION:
1954                 err = iscsi_if_create_session(priv, ep, ev,
1955                                               ev->u.c_session.initial_cmdsn,
1956                                               ev->u.c_session.cmds_max,
1957                                               ev->u.c_session.queue_depth);
1958                 break;
1959         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1960                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1961                 if (!ep) {
1962                         err = -EINVAL;
1963                         break;
1964                 }
1965
1966                 err = iscsi_if_create_session(priv, ep, ev,
1967                                         ev->u.c_bound_session.initial_cmdsn,
1968                                         ev->u.c_bound_session.cmds_max,
1969                                         ev->u.c_bound_session.queue_depth);
1970                 break;
1971         case ISCSI_UEVENT_DESTROY_SESSION:
1972                 session = iscsi_session_lookup(ev->u.d_session.sid);
1973                 if (session)
1974                         transport->destroy_session(session);
1975                 else
1976                         err = -EINVAL;
1977                 break;
1978         case ISCSI_UEVENT_UNBIND_SESSION:
1979                 session = iscsi_session_lookup(ev->u.d_session.sid);
1980                 if (session)
1981                         scsi_queue_work(iscsi_session_to_shost(session),
1982                                         &session->unbind_work);
1983                 else
1984                         err = -EINVAL;
1985                 break;
1986         case ISCSI_UEVENT_CREATE_CONN:
1987                 err = iscsi_if_create_conn(transport, ev);
1988                 break;
1989         case ISCSI_UEVENT_DESTROY_CONN:
1990                 err = iscsi_if_destroy_conn(transport, ev);
1991                 break;
1992         case ISCSI_UEVENT_BIND_CONN:
1993                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1994                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1995
1996                 if (conn && conn->ep)
1997                         iscsi_if_ep_disconnect(transport, conn->ep->id);
1998
1999                 if (!session || !conn) {
2000                         err = -EINVAL;
2001                         break;
2002                 }
2003
2004                 ev->r.retcode = transport->bind_conn(session, conn,
2005                                                 ev->u.b_conn.transport_eph,
2006                                                 ev->u.b_conn.is_leading);
2007                 if (ev->r.retcode || !transport->ep_connect)
2008                         break;
2009
2010                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2011                 if (ep) {
2012                         ep->conn = conn;
2013
2014                         mutex_lock(&conn->ep_mutex);
2015                         conn->ep = ep;
2016                         mutex_unlock(&conn->ep_mutex);
2017                 } else
2018                         iscsi_cls_conn_printk(KERN_ERR, conn,
2019                                               "Could not set ep conn "
2020                                               "binding\n");
2021                 break;
2022         case ISCSI_UEVENT_SET_PARAM:
2023                 err = iscsi_set_param(transport, ev);
2024                 break;
2025         case ISCSI_UEVENT_START_CONN:
2026                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
2027                 if (conn)
2028                         ev->r.retcode = transport->start_conn(conn);
2029                 else
2030                         err = -EINVAL;
2031                 break;
2032         case ISCSI_UEVENT_STOP_CONN:
2033                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2034                 if (conn)
2035                         transport->stop_conn(conn, ev->u.stop_conn.flag);
2036                 else
2037                         err = -EINVAL;
2038                 break;
2039         case ISCSI_UEVENT_SEND_PDU:
2040                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
2041                 if (conn)
2042                         ev->r.retcode = transport->send_pdu(conn,
2043                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2044                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2045                                 ev->u.send_pdu.data_size);
2046                 else
2047                         err = -EINVAL;
2048                 break;
2049         case ISCSI_UEVENT_GET_STATS:
2050                 err = iscsi_if_get_stats(transport, nlh);
2051                 break;
2052         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2053         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2054         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2055         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2056                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2057                 break;
2058         case ISCSI_UEVENT_TGT_DSCVR:
2059                 err = iscsi_tgt_dscvr(transport, ev);
2060                 break;
2061         case ISCSI_UEVENT_SET_HOST_PARAM:
2062                 err = iscsi_set_host_param(transport, ev);
2063                 break;
2064         case ISCSI_UEVENT_PATH_UPDATE:
2065                 err = iscsi_set_path(transport, ev);
2066                 break;
2067         case ISCSI_UEVENT_SET_IFACE_PARAMS:
2068                 err = iscsi_set_iface_params(transport, ev);
2069                 break;
2070         default:
2071                 err = -ENOSYS;
2072                 break;
2073         }
2074
2075         module_put(transport->owner);
2076         return err;
2077 }
2078
2079 /*
2080  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
2081  * Malformed skbs with wrong lengths or invalid creds are not processed.
2082  */
2083 static void
2084 iscsi_if_rx(struct sk_buff *skb)
2085 {
2086         mutex_lock(&rx_queue_mutex);
2087         while (skb->len >= NLMSG_SPACE(0)) {
2088                 int err;
2089                 uint32_t rlen;
2090                 struct nlmsghdr *nlh;
2091                 struct iscsi_uevent *ev;
2092                 uint32_t group;
2093
2094                 nlh = nlmsg_hdr(skb);
2095                 if (nlh->nlmsg_len < sizeof(*nlh) ||
2096                     skb->len < nlh->nlmsg_len) {
2097                         break;
2098                 }
2099
2100                 ev = NLMSG_DATA(nlh);
2101                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2102                 if (rlen > skb->len)
2103                         rlen = skb->len;
2104
2105                 err = iscsi_if_recv_msg(skb, nlh, &group);
2106                 if (err) {
2107                         ev->type = ISCSI_KEVENT_IF_ERROR;
2108                         ev->iferror = err;
2109                 }
2110                 do {
2111                         /*
2112                          * special case for GET_STATS:
2113                          * on success - sending reply and stats from
2114                          * inside of if_recv_msg(),
2115                          * on error - fall through.
2116                          */
2117                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2118                                 break;
2119                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
2120                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2121                 } while (err < 0 && err != -ECONNREFUSED);
2122                 skb_pull(skb, rlen);
2123         }
2124         mutex_unlock(&rx_queue_mutex);
2125 }
2126
2127 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
2128 struct device_attribute dev_attr_##_prefix##_##_name =  \
2129         __ATTR(_name,_mode,_show,_store)
2130
2131 /*
2132  * iSCSI connection attrs
2133  */
2134 #define iscsi_conn_attr_show(param)                                     \
2135 static ssize_t                                                          \
2136 show_conn_param_##param(struct device *dev,                             \
2137                         struct device_attribute *attr, char *buf)       \
2138 {                                                                       \
2139         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2140         struct iscsi_transport *t = conn->transport;                    \
2141         return t->get_conn_param(conn, param, buf);                     \
2142 }
2143
2144 #define iscsi_conn_attr(field, param)                                   \
2145         iscsi_conn_attr_show(param)                                     \
2146 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
2147                         NULL);
2148
2149 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2150 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2151 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2152 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2153 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2154 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2155 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
2156 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2157 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
2158 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2159 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
2160
2161 #define iscsi_conn_ep_attr_show(param)                                  \
2162 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
2163                                           struct device_attribute *attr,\
2164                                           char *buf)                    \
2165 {                                                                       \
2166         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2167         struct iscsi_transport *t = conn->transport;                    \
2168         struct iscsi_endpoint *ep;                                      \
2169         ssize_t rc;                                                     \
2170                                                                         \
2171         /*                                                              \
2172          * Need to make sure ep_disconnect does not free the LLD's      \
2173          * interconnect resources while we are trying to read them.     \
2174          */                                                             \
2175         mutex_lock(&conn->ep_mutex);                                    \
2176         ep = conn->ep;                                                  \
2177         if (!ep && t->ep_connect) {                                     \
2178                 mutex_unlock(&conn->ep_mutex);                          \
2179                 return -ENOTCONN;                                       \
2180         }                                                               \
2181                                                                         \
2182         if (ep)                                                         \
2183                 rc = t->get_ep_param(ep, param, buf);                   \
2184         else                                                            \
2185                 rc = t->get_conn_param(conn, param, buf);               \
2186         mutex_unlock(&conn->ep_mutex);                                  \
2187         return rc;                                                      \
2188 }
2189
2190 #define iscsi_conn_ep_attr(field, param)                                \
2191         iscsi_conn_ep_attr_show(param)                                  \
2192 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2193                         show_conn_ep_param_##param, NULL);
2194
2195 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2196 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2197
2198 static struct attribute *iscsi_conn_attrs[] = {
2199         &dev_attr_conn_max_recv_dlength.attr,
2200         &dev_attr_conn_max_xmit_dlength.attr,
2201         &dev_attr_conn_header_digest.attr,
2202         &dev_attr_conn_data_digest.attr,
2203         &dev_attr_conn_ifmarker.attr,
2204         &dev_attr_conn_ofmarker.attr,
2205         &dev_attr_conn_address.attr,
2206         &dev_attr_conn_port.attr,
2207         &dev_attr_conn_exp_statsn.attr,
2208         &dev_attr_conn_persistent_address.attr,
2209         &dev_attr_conn_persistent_port.attr,
2210         &dev_attr_conn_ping_tmo.attr,
2211         &dev_attr_conn_recv_tmo.attr,
2212         NULL,
2213 };
2214
2215 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2216                                          struct attribute *attr, int i)
2217 {
2218         struct device *cdev = container_of(kobj, struct device, kobj);
2219         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2220         struct iscsi_transport *t = conn->transport;
2221         int param;
2222
2223         if (attr == &dev_attr_conn_max_recv_dlength.attr)
2224                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2225         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2226                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2227         else if (attr == &dev_attr_conn_header_digest.attr)
2228                 param = ISCSI_PARAM_HDRDGST_EN;
2229         else if (attr == &dev_attr_conn_data_digest.attr)
2230                 param = ISCSI_PARAM_DATADGST_EN;
2231         else if (attr == &dev_attr_conn_ifmarker.attr)
2232                 param = ISCSI_PARAM_IFMARKER_EN;
2233         else if (attr == &dev_attr_conn_ofmarker.attr)
2234                 param = ISCSI_PARAM_OFMARKER_EN;
2235         else if (attr == &dev_attr_conn_address.attr)
2236                 param = ISCSI_PARAM_CONN_ADDRESS;
2237         else if (attr == &dev_attr_conn_port.attr)
2238                 param = ISCSI_PARAM_CONN_PORT;
2239         else if (attr == &dev_attr_conn_exp_statsn.attr)
2240                 param = ISCSI_PARAM_EXP_STATSN;
2241         else if (attr == &dev_attr_conn_persistent_address.attr)
2242                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2243         else if (attr == &dev_attr_conn_persistent_port.attr)
2244                 param = ISCSI_PARAM_PERSISTENT_PORT;
2245         else if (attr == &dev_attr_conn_ping_tmo.attr)
2246                 param = ISCSI_PARAM_PING_TMO;
2247         else if (attr == &dev_attr_conn_recv_tmo.attr)
2248                 param = ISCSI_PARAM_RECV_TMO;
2249         else {
2250                 WARN_ONCE(1, "Invalid conn attr");
2251                 return 0;
2252         }
2253
2254         return t->attr_is_visible(ISCSI_PARAM, param);
2255 }
2256
2257 static struct attribute_group iscsi_conn_group = {
2258         .attrs = iscsi_conn_attrs,
2259         .is_visible = iscsi_conn_attr_is_visible,
2260 };
2261
2262 /*
2263  * iSCSI session attrs
2264  */
2265 #define iscsi_session_attr_show(param, perm)                            \
2266 static ssize_t                                                          \
2267 show_session_param_##param(struct device *dev,                          \
2268                            struct device_attribute *attr, char *buf)    \
2269 {                                                                       \
2270         struct iscsi_cls_session *session =                             \
2271                 iscsi_dev_to_session(dev->parent);                      \
2272         struct iscsi_transport *t = session->transport;                 \
2273                                                                         \
2274         if (perm && !capable(CAP_SYS_ADMIN))                            \
2275                 return -EACCES;                                         \
2276         return t->get_session_param(session, param, buf);               \
2277 }
2278
2279 #define iscsi_session_attr(field, param, perm)                          \
2280         iscsi_session_attr_show(param, perm)                            \
2281 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2282                         NULL);
2283 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2284 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2285 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2286 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2287 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2288 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2289 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2290 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2291 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2292 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2293 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2294 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2295 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2296 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2297 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2298 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2299 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2300 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2301 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2302 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2303 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2304
2305 static ssize_t
2306 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2307                         char *buf)
2308 {
2309         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2310         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2311 }
2312 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2313                         NULL);
2314
2315 #define iscsi_priv_session_attr_show(field, format)                     \
2316 static ssize_t                                                          \
2317 show_priv_session_##field(struct device *dev,                           \
2318                           struct device_attribute *attr, char *buf)     \
2319 {                                                                       \
2320         struct iscsi_cls_session *session =                             \
2321                         iscsi_dev_to_session(dev->parent);              \
2322         if (session->field == -1)                                       \
2323                 return sprintf(buf, "off\n");                           \
2324         return sprintf(buf, format"\n", session->field);                \
2325 }
2326
2327 #define iscsi_priv_session_attr_store(field)                            \
2328 static ssize_t                                                          \
2329 store_priv_session_##field(struct device *dev,                          \
2330                            struct device_attribute *attr,               \
2331                            const char *buf, size_t count)               \
2332 {                                                                       \
2333         int val;                                                        \
2334         char *cp;                                                       \
2335         struct iscsi_cls_session *session =                             \
2336                 iscsi_dev_to_session(dev->parent);                      \
2337         if ((session->state == ISCSI_SESSION_FREE) ||                   \
2338             (session->state == ISCSI_SESSION_FAILED))                   \
2339                 return -EBUSY;                                          \
2340         if (strncmp(buf, "off", 3) == 0)                                \
2341                 session->field = -1;                                    \
2342         else {                                                          \
2343                 val = simple_strtoul(buf, &cp, 0);                      \
2344                 if (*cp != '\0' && *cp != '\n')                         \
2345                         return -EINVAL;                                 \
2346                 session->field = val;                                   \
2347         }                                                               \
2348         return count;                                                   \
2349 }
2350
2351 #define iscsi_priv_session_rw_attr(field, format)                       \
2352         iscsi_priv_session_attr_show(field, format)                     \
2353         iscsi_priv_session_attr_store(field)                            \
2354 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2355                         show_priv_session_##field,                      \
2356                         store_priv_session_##field)
2357 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2358
2359 static struct attribute *iscsi_session_attrs[] = {
2360         &dev_attr_sess_initial_r2t.attr,
2361         &dev_attr_sess_max_outstanding_r2t.attr,
2362         &dev_attr_sess_immediate_data.attr,
2363         &dev_attr_sess_first_burst_len.attr,
2364         &dev_attr_sess_max_burst_len.attr,
2365         &dev_attr_sess_data_pdu_in_order.attr,
2366         &dev_attr_sess_data_seq_in_order.attr,
2367         &dev_attr_sess_erl.attr,
2368         &dev_attr_sess_targetname.attr,
2369         &dev_attr_sess_tpgt.attr,
2370         &dev_attr_sess_password.attr,
2371         &dev_attr_sess_password_in.attr,
2372         &dev_attr_sess_username.attr,
2373         &dev_attr_sess_username_in.attr,
2374         &dev_attr_sess_fast_abort.attr,
2375         &dev_attr_sess_abort_tmo.attr,
2376         &dev_attr_sess_lu_reset_tmo.attr,
2377         &dev_attr_sess_tgt_reset_tmo.attr,
2378         &dev_attr_sess_ifacename.attr,
2379         &dev_attr_sess_initiatorname.attr,
2380         &dev_attr_sess_targetalias.attr,
2381         &dev_attr_priv_sess_recovery_tmo.attr,
2382         &dev_attr_priv_sess_state.attr,
2383         NULL,
2384 };
2385
2386 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2387                                             struct attribute *attr, int i)
2388 {
2389         struct device *cdev = container_of(kobj, struct device, kobj);
2390         struct iscsi_cls_session *session = transport_class_to_session(cdev);
2391         struct iscsi_transport *t = session->transport;
2392         int param;
2393
2394         if (attr == &dev_attr_sess_initial_r2t.attr)
2395                 param = ISCSI_PARAM_INITIAL_R2T_EN;
2396         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2397                 param = ISCSI_PARAM_MAX_R2T;
2398         else if (attr == &dev_attr_sess_immediate_data.attr)
2399                 param = ISCSI_PARAM_IMM_DATA_EN;
2400         else if (attr == &dev_attr_sess_first_burst_len.attr)
2401                 param = ISCSI_PARAM_FIRST_BURST;
2402         else if (attr == &dev_attr_sess_max_burst_len.attr)
2403                 param = ISCSI_PARAM_MAX_BURST;
2404         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2405                 param = ISCSI_PARAM_PDU_INORDER_EN;
2406         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2407                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2408         else if (attr == &dev_attr_sess_erl.attr)
2409                 param = ISCSI_PARAM_ERL;
2410         else if (attr == &dev_attr_sess_targetname.attr)
2411                 param = ISCSI_PARAM_TARGET_NAME;
2412         else if (attr == &dev_attr_sess_tpgt.attr)
2413                 param = ISCSI_PARAM_TPGT;
2414         else if (attr == &dev_attr_sess_password.attr)
2415                 param = ISCSI_PARAM_USERNAME;
2416         else if (attr == &dev_attr_sess_password_in.attr)
2417                 param = ISCSI_PARAM_USERNAME_IN;
2418         else if (attr == &dev_attr_sess_username.attr)
2419                 param = ISCSI_PARAM_PASSWORD;
2420         else if (attr == &dev_attr_sess_username_in.attr)
2421                 param = ISCSI_PARAM_PASSWORD_IN;
2422         else if (attr == &dev_attr_sess_fast_abort.attr)
2423                 param = ISCSI_PARAM_FAST_ABORT;
2424         else if (attr == &dev_attr_sess_abort_tmo.attr)
2425                 param = ISCSI_PARAM_ABORT_TMO;
2426         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2427                 param = ISCSI_PARAM_LU_RESET_TMO;
2428         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2429                 param = ISCSI_PARAM_TGT_RESET_TMO;
2430         else if (attr == &dev_attr_sess_ifacename.attr)
2431                 param = ISCSI_PARAM_IFACE_NAME;
2432         else if (attr == &dev_attr_sess_initiatorname.attr)
2433                 param = ISCSI_PARAM_INITIATOR_NAME;
2434         else if (attr == &dev_attr_sess_targetalias.attr)
2435                 param = ISCSI_PARAM_TARGET_ALIAS;
2436         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2437                 return S_IRUGO | S_IWUSR;
2438         else if (attr == &dev_attr_priv_sess_state.attr)
2439                 return S_IRUGO;
2440         else {
2441                 WARN_ONCE(1, "Invalid session attr");
2442                 return 0;
2443         }
2444
2445         return t->attr_is_visible(ISCSI_PARAM, param);
2446 }
2447
2448 static struct attribute_group iscsi_session_group = {
2449         .attrs = iscsi_session_attrs,
2450         .is_visible = iscsi_session_attr_is_visible,
2451 };
2452
2453 /*
2454  * iSCSI host attrs
2455  */
2456 #define iscsi_host_attr_show(param)                                     \
2457 static ssize_t                                                          \
2458 show_host_param_##param(struct device *dev,                             \
2459                         struct device_attribute *attr, char *buf)       \
2460 {                                                                       \
2461         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2462         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2463         return priv->iscsi_transport->get_host_param(shost, param, buf); \
2464 }
2465
2466 #define iscsi_host_attr(field, param)                                   \
2467         iscsi_host_attr_show(param)                                     \
2468 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2469                         NULL);
2470
2471 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2472 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2473 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2474 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2475
2476 static struct attribute *iscsi_host_attrs[] = {
2477         &dev_attr_host_netdev.attr,
2478         &dev_attr_host_hwaddress.attr,
2479         &dev_attr_host_ipaddress.attr,
2480         &dev_attr_host_initiatorname.attr,
2481         NULL,
2482 };
2483
2484 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2485                                          struct attribute *attr, int i)
2486 {
2487         struct device *cdev = container_of(kobj, struct device, kobj);
2488         struct Scsi_Host *shost = transport_class_to_shost(cdev);
2489         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2490         int param;
2491
2492         if (attr == &dev_attr_host_netdev.attr)
2493                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2494         else if (attr == &dev_attr_host_hwaddress.attr)
2495                 param = ISCSI_HOST_PARAM_HWADDRESS;
2496         else if (attr == &dev_attr_host_ipaddress.attr)
2497                 param = ISCSI_HOST_PARAM_IPADDRESS;
2498         else if (attr == &dev_attr_host_initiatorname.attr)
2499                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2500         else {
2501                 WARN_ONCE(1, "Invalid host attr");
2502                 return 0;
2503         }
2504
2505         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2506 }
2507
2508 static struct attribute_group iscsi_host_group = {
2509         .attrs = iscsi_host_attrs,
2510         .is_visible = iscsi_host_attr_is_visible,
2511 };
2512
2513 static int iscsi_session_match(struct attribute_container *cont,
2514                            struct device *dev)
2515 {
2516         struct iscsi_cls_session *session;
2517         struct Scsi_Host *shost;
2518         struct iscsi_internal *priv;
2519
2520         if (!iscsi_is_session_dev(dev))
2521                 return 0;
2522
2523         session = iscsi_dev_to_session(dev);
2524         shost = iscsi_session_to_shost(session);
2525         if (!shost->transportt)
2526                 return 0;
2527
2528         priv = to_iscsi_internal(shost->transportt);
2529         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2530                 return 0;
2531
2532         return &priv->session_cont.ac == cont;
2533 }
2534
2535 static int iscsi_conn_match(struct attribute_container *cont,
2536                            struct device *dev)
2537 {
2538         struct iscsi_cls_session *session;
2539         struct iscsi_cls_conn *conn;
2540         struct Scsi_Host *shost;
2541         struct iscsi_internal *priv;
2542
2543         if (!iscsi_is_conn_dev(dev))
2544                 return 0;
2545
2546         conn = iscsi_dev_to_conn(dev);
2547         session = iscsi_dev_to_session(conn->dev.parent);
2548         shost = iscsi_session_to_shost(session);
2549
2550         if (!shost->transportt)
2551                 return 0;
2552
2553         priv = to_iscsi_internal(shost->transportt);
2554         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2555                 return 0;
2556
2557         return &priv->conn_cont.ac == cont;
2558 }
2559
2560 static int iscsi_host_match(struct attribute_container *cont,
2561                             struct device *dev)
2562 {
2563         struct Scsi_Host *shost;
2564         struct iscsi_internal *priv;
2565
2566         if (!scsi_is_host_device(dev))
2567                 return 0;
2568
2569         shost = dev_to_shost(dev);
2570         if (!shost->transportt  ||
2571             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2572                 return 0;
2573
2574         priv = to_iscsi_internal(shost->transportt);
2575         return &priv->t.host_attrs.ac == cont;
2576 }
2577
2578 struct scsi_transport_template *
2579 iscsi_register_transport(struct iscsi_transport *tt)
2580 {
2581         struct iscsi_internal *priv;
2582         unsigned long flags;
2583         int err;
2584
2585         BUG_ON(!tt);
2586
2587         priv = iscsi_if_transport_lookup(tt);
2588         if (priv)
2589                 return NULL;
2590
2591         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2592         if (!priv)
2593                 return NULL;
2594         INIT_LIST_HEAD(&priv->list);
2595         priv->iscsi_transport = tt;
2596         priv->t.user_scan = iscsi_user_scan;
2597         priv->t.create_work_queue = 1;
2598
2599         priv->dev.class = &iscsi_transport_class;
2600         dev_set_name(&priv->dev, "%s", tt->name);
2601         err = device_register(&priv->dev);
2602         if (err)
2603                 goto free_priv;
2604
2605         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2606         if (err)
2607                 goto unregister_dev;
2608
2609         /* host parameters */
2610         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2611         priv->t.host_attrs.ac.match = iscsi_host_match;
2612         priv->t.host_attrs.ac.grp = &iscsi_host_group;
2613         priv->t.host_size = sizeof(struct iscsi_cls_host);
2614         transport_container_register(&priv->t.host_attrs);
2615
2616         /* connection parameters */
2617         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2618         priv->conn_cont.ac.match = iscsi_conn_match;
2619         priv->conn_cont.ac.grp = &iscsi_conn_group;
2620         transport_container_register(&priv->conn_cont);
2621
2622         /* session parameters */
2623         priv->session_cont.ac.class = &iscsi_session_class.class;
2624         priv->session_cont.ac.match = iscsi_session_match;
2625         priv->session_cont.ac.grp = &iscsi_session_group;
2626         transport_container_register(&priv->session_cont);
2627
2628         spin_lock_irqsave(&iscsi_transport_lock, flags);
2629         list_add(&priv->list, &iscsi_transports);
2630         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2631
2632         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2633         return &priv->t;
2634
2635 unregister_dev:
2636         device_unregister(&priv->dev);
2637         return NULL;
2638 free_priv:
2639         kfree(priv);
2640         return NULL;
2641 }
2642 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2643
2644 int iscsi_unregister_transport(struct iscsi_transport *tt)
2645 {
2646         struct iscsi_internal *priv;
2647         unsigned long flags;
2648
2649         BUG_ON(!tt);
2650
2651         mutex_lock(&rx_queue_mutex);
2652
2653         priv = iscsi_if_transport_lookup(tt);
2654         BUG_ON (!priv);
2655
2656         spin_lock_irqsave(&iscsi_transport_lock, flags);
2657         list_del(&priv->list);
2658         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2659
2660         transport_container_unregister(&priv->conn_cont);
2661         transport_container_unregister(&priv->session_cont);
2662         transport_container_unregister(&priv->t.host_attrs);
2663
2664         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2665         device_unregister(&priv->dev);
2666         mutex_unlock(&rx_queue_mutex);
2667
2668         return 0;
2669 }
2670 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2671
2672 static __init int iscsi_transport_init(void)
2673 {
2674         int err;
2675
2676         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2677                 ISCSI_TRANSPORT_VERSION);
2678
2679         atomic_set(&iscsi_session_nr, 0);
2680
2681         err = class_register(&iscsi_transport_class);
2682         if (err)
2683                 return err;
2684
2685         err = class_register(&iscsi_endpoint_class);
2686         if (err)
2687                 goto unregister_transport_class;
2688
2689         err = class_register(&iscsi_iface_class);
2690         if (err)
2691                 goto unregister_endpoint_class;
2692
2693         err = transport_class_register(&iscsi_host_class);
2694         if (err)
2695                 goto unregister_iface_class;
2696
2697         err = transport_class_register(&iscsi_connection_class);
2698         if (err)
2699                 goto unregister_host_class;
2700
2701         err = transport_class_register(&iscsi_session_class);
2702         if (err)
2703                 goto unregister_conn_class;
2704
2705         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2706                                     NULL, THIS_MODULE);
2707         if (!nls) {
2708                 err = -ENOBUFS;
2709                 goto unregister_session_class;
2710         }
2711
2712         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2713         if (!iscsi_eh_timer_workq)
2714                 goto release_nls;
2715
2716         return 0;
2717
2718 release_nls:
2719         netlink_kernel_release(nls);
2720 unregister_session_class:
2721         transport_class_unregister(&iscsi_session_class);
2722 unregister_conn_class:
2723         transport_class_unregister(&iscsi_connection_class);
2724 unregister_host_class:
2725         transport_class_unregister(&iscsi_host_class);
2726 unregister_iface_class:
2727         class_unregister(&iscsi_iface_class);
2728 unregister_endpoint_class:
2729         class_unregister(&iscsi_endpoint_class);
2730 unregister_transport_class:
2731         class_unregister(&iscsi_transport_class);
2732         return err;
2733 }
2734
2735 static void __exit iscsi_transport_exit(void)
2736 {
2737         destroy_workqueue(iscsi_eh_timer_workq);
2738         netlink_kernel_release(nls);
2739         transport_class_unregister(&iscsi_connection_class);
2740         transport_class_unregister(&iscsi_session_class);
2741         transport_class_unregister(&iscsi_host_class);
2742         class_unregister(&iscsi_endpoint_class);
2743         class_unregister(&iscsi_iface_class);
2744         class_unregister(&iscsi_transport_class);
2745 }
2746
2747 module_init(iscsi_transport_init);
2748 module_exit(iscsi_transport_exit);
2749
2750 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2751               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2752               "Alex Aizman <itn780@yahoo.com>");
2753 MODULE_DESCRIPTION("iSCSI Transport Interface");
2754 MODULE_LICENSE("GPL");
2755 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2756 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);