drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/bsg-lib.h>
  27 #include <linux/idr.h>
  28 #include <net/tcp.h>
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_iscsi.h>
  34 #include <scsi/iscsi_if.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <scsi/scsi_bsg_iscsi.h>
  37
  38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  39
  40 static int dbg_session;
  41 module_param_named(debug_session, dbg_session, int,
  42                    S_IRUGO | S_IWUSR);
  43 MODULE_PARM_DESC(debug_session,
  44                  "Turn on debugging for sessions in scsi_transport_iscsi "
  45                  "module. Set to 1 to turn on, and zero to turn off. Default "
  46                  "is off.");
  47
  48 static int dbg_conn;
  49 module_param_named(debug_conn, dbg_conn, int,
  50                    S_IRUGO | S_IWUSR);
  51 MODULE_PARM_DESC(debug_conn,
  52                  "Turn on debugging for connections in scsi_transport_iscsi "
  53                  "module. Set to 1 to turn on, and zero to turn off. Default "
  54                  "is off.");
  55
  56 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  57         do {                                                            \
  58                 if (dbg_session)                                        \
  59                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  60                                                  "%s: " dbg_fmt,        \
  61                                                  __func__, ##arg);      \
  62         } while (0);
  63
  64 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  65         do {                                                            \
  66                 if (dbg_conn)                                           \
  67                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  68                                               "%s: " dbg_fmt,           \
  69                                               __func__, ##arg); \
  70         } while (0);
  71
  72 struct iscsi_internal {
  73         struct scsi_transport_template t;
  74         struct iscsi_transport *iscsi_transport;
  75         struct list_head list;
  76         struct device dev;
  77
  78         struct transport_container conn_cont;
  79         struct transport_container session_cont;
  80 };
  81
  82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  83 static struct workqueue_struct *iscsi_eh_timer_workq;
  84
  85 static DEFINE_IDA(iscsi_sess_ida);
  86 /*
  87  * list of registered transports and lock that must
  88  * be held while accessing list. The iscsi_transport_lock must
  89  * be acquired after the rx_queue_mutex.
  90  */
  91 static LIST_HEAD(iscsi_transports);
  92 static DEFINE_SPINLOCK(iscsi_transport_lock);
  93
  94 #define to_iscsi_internal(tmpl) \
  95         container_of(tmpl, struct iscsi_internal, t)
  96
  97 #define dev_to_iscsi_internal(_dev) \
  98         container_of(_dev, struct iscsi_internal, dev)
  99
 100 static void iscsi_transport_release(struct device *dev)
 101 {
 102         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 103         kfree(priv);
 104 }
 105
 106 /*
 107  * iscsi_transport_class represents the iscsi_transports that are
 108  * registered.
 109  */
 110 static struct class iscsi_transport_class = {
 111         .name = "iscsi_transport",
 112         .dev_release = iscsi_transport_release,
 113 };
 114
 115 static ssize_t
 116 show_transport_handle(struct device *dev, struct device_attribute *attr,
 117                       char *buf)
 118 {
 119         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 120         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 121 }
 122 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 123
 124 #define show_transport_attr(name, format)                               \
 125 static ssize_t                                                          \
 126 show_transport_##name(struct device *dev,                               \
 127                       struct device_attribute *attr,char *buf)          \
 128 {                                                                       \
 129         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 130         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 131 }                                                                       \
 132 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 133
 134 show_transport_attr(caps, "0x%x");
 135
 136 static struct attribute *iscsi_transport_attrs[] = {
 137         &dev_attr_handle.attr,
 138         &dev_attr_caps.attr,
 139         NULL,
 140 };
 141
 142 static struct attribute_group iscsi_transport_group = {
 143         .attrs = iscsi_transport_attrs,
 144 };
 145
 146 /*
 147  * iSCSI endpoint attrs
 148  */
 149 #define iscsi_dev_to_endpoint(_dev) \
 150         container_of(_dev, struct iscsi_endpoint, dev)
 151
 152 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 153 struct device_attribute dev_attr_##_prefix##_##_name =  \
 154         __ATTR(_name,_mode,_show,_store)
 155
 156 static void iscsi_endpoint_release(struct device *dev)
 157 {
 158         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 159         kfree(ep);
 160 }
 161
 162 static struct class iscsi_endpoint_class = {
 163         .name = "iscsi_endpoint",
 164         .dev_release = iscsi_endpoint_release,
 165 };
 166
 167 static ssize_t
 168 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 169 {
 170         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 171         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 172 }
 173 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 174
 175 static struct attribute *iscsi_endpoint_attrs[] = {
 176         &dev_attr_ep_handle.attr,
 177         NULL,
 178 };
 179
 180 static struct attribute_group iscsi_endpoint_group = {
 181         .attrs = iscsi_endpoint_attrs,
 182 };
 183
 184 #define ISCSI_MAX_EPID -1
 185
 186 static int iscsi_match_epid(struct device *dev, void *data)
 187 {
 188         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 189         uint64_t *epid = (uint64_t *) data;
 190
 191         return *epid == ep->id;
 192 }
 193
 194 struct iscsi_endpoint *
 195 iscsi_create_endpoint(int dd_size)
 196 {
 197         struct device *dev;
 198         struct iscsi_endpoint *ep;
 199         uint64_t id;
 200         int err;
 201
 202         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 203                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 204                                         iscsi_match_epid);
 205                 if (!dev)
 206                         break;
 207         }
 208         if (id == ISCSI_MAX_EPID) {
 209                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 210                        ISCSI_MAX_EPID - 1);
 211                 return NULL;
 212         }
 213
 214         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 215         if (!ep)
 216                 return NULL;
 217
 218         ep->id = id;
 219         ep->dev.class = &iscsi_endpoint_class;
 220         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 221         err = device_register(&ep->dev);
 222         if (err)
 223                 goto free_ep;
 224
 225         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 226         if (err)
 227                 goto unregister_dev;
 228
 229         if (dd_size)
 230                 ep->dd_data = &ep[1];
 231         return ep;
 232
 233 unregister_dev:
 234         device_unregister(&ep->dev);
 235         return NULL;
 236
 237 free_ep:
 238         kfree(ep);
 239         return NULL;
 240 }
 241 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 242
 243 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 244 {
 245         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 246         device_unregister(&ep->dev);
 247 }
 248 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 249
 250 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 251 {
 252         struct iscsi_endpoint *ep;
 253         struct device *dev;
 254
 255         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 256                                 iscsi_match_epid);
 257         if (!dev)
 258                 return NULL;
 259
 260         ep = iscsi_dev_to_endpoint(dev);
 261         /*
 262          * we can drop this now because the interface will prevent
 263          * removals and lookups from racing.
 264          */
 265         put_device(dev);
 266         return ep;
 267 }
 268 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 269
 270 /*
 271  * Interface to display network param to sysfs
 272  */
 273
 274 static void iscsi_iface_release(struct device *dev)
 275 {
 276         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 277         struct device *parent = iface->dev.parent;
 278
 279         kfree(iface);
 280         put_device(parent);
 281 }
 282
 283
 284 static struct class iscsi_iface_class = {
 285         .name = "iscsi_iface",
 286         .dev_release = iscsi_iface_release,
 287 };
 288
 289 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 290 struct device_attribute dev_attr_##_prefix##_##_name =          \
 291         __ATTR(_name, _mode, _show, _store)
 292
 293 /* iface attrs show */
 294 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 295 static ssize_t                                                          \
 296 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 297                      char *buf)                                         \
 298 {                                                                       \
 299         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 300         struct iscsi_transport *t = iface->transport;                   \
 301         return t->get_iface_param(iface, param_type, param, buf);       \
 302 }                                                                       \
 303
 304 #define iscsi_iface_net_attr(type, name, param)                         \
 305         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 306 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 307
 308 /* generic read only ipvi4 attribute */
 309 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 310 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 311 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 312 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 313
 314 /* generic read only ipv6 attribute */
 315 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 316 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 317 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 318 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 319                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 320 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 321                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 322
 323 /* common read only iface attribute */
 324 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 325 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 326 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 327 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 328 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 329 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 330
 331 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 332                                           struct attribute *attr, int i)
 333 {
 334         struct device *dev = container_of(kobj, struct device, kobj);
 335         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 336         struct iscsi_transport *t = iface->transport;
 337         int param;
 338
 339         if (attr == &dev_attr_iface_enabled.attr)
 340                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 341         else if (attr == &dev_attr_iface_vlan_id.attr)
 342                 param = ISCSI_NET_PARAM_VLAN_ID;
 343         else if (attr == &dev_attr_iface_vlan_priority.attr)
 344                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 345         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 346                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 347         else if (attr == &dev_attr_iface_mtu.attr)
 348                 param = ISCSI_NET_PARAM_MTU;
 349         else if (attr == &dev_attr_iface_port.attr)
 350                 param = ISCSI_NET_PARAM_PORT;
 351         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 352                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 353                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 354                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 355                         param = ISCSI_NET_PARAM_IPV4_GW;
 356                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 357                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 358                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 359                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 360                 else
 361                         return 0;
 362         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 363                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 364                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 365                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 366                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 367                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 368                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 369                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 370                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 371                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 372                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 373                 else
 374                         return 0;
 375         } else {
 376                 WARN_ONCE(1, "Invalid iface attr");
 377                 return 0;
 378         }
 379
 380         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 381 }
 382
 383 static struct attribute *iscsi_iface_attrs[] = {
 384         &dev_attr_iface_enabled.attr,
 385         &dev_attr_iface_vlan_id.attr,
 386         &dev_attr_iface_vlan_priority.attr,
 387         &dev_attr_iface_vlan_enabled.attr,
 388         &dev_attr_ipv4_iface_ipaddress.attr,
 389         &dev_attr_ipv4_iface_gateway.attr,
 390         &dev_attr_ipv4_iface_subnet.attr,
 391         &dev_attr_ipv4_iface_bootproto.attr,
 392         &dev_attr_ipv6_iface_ipaddress.attr,
 393         &dev_attr_ipv6_iface_link_local_addr.attr,
 394         &dev_attr_ipv6_iface_router_addr.attr,
 395         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 396         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 397         &dev_attr_iface_mtu.attr,
 398         &dev_attr_iface_port.attr,
 399         NULL,
 400 };
 401
 402 static struct attribute_group iscsi_iface_group = {
 403         .attrs = iscsi_iface_attrs,
 404         .is_visible = iscsi_iface_attr_is_visible,
 405 };
 406
 407 struct iscsi_iface *
 408 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 409                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 410 {
 411         struct iscsi_iface *iface;
 412         int err;
 413
 414         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 415         if (!iface)
 416                 return NULL;
 417
 418         iface->transport = transport;
 419         iface->iface_type = iface_type;
 420         iface->iface_num = iface_num;
 421         iface->dev.release = iscsi_iface_release;
 422         iface->dev.class = &iscsi_iface_class;
 423         /* parent reference released in iscsi_iface_release */
 424         iface->dev.parent = get_device(&shost->shost_gendev);
 425         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 426                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 427                              iface_num);
 428         else
 429                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 430                              iface_num);
 431
 432         err = device_register(&iface->dev);
 433         if (err)
 434                 goto free_iface;
 435
 436         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 437         if (err)
 438                 goto unreg_iface;
 439
 440         if (dd_size)
 441                 iface->dd_data = &iface[1];
 442         return iface;
 443
 444 unreg_iface:
 445         device_unregister(&iface->dev);
 446         return NULL;
 447
 448 free_iface:
 449         put_device(iface->dev.parent);
 450         kfree(iface);
 451         return NULL;
 452 }
 453 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 454
 455 void iscsi_destroy_iface(struct iscsi_iface *iface)
 456 {
 457         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 458         device_unregister(&iface->dev);
 459 }
 460 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 461
 462 /*
 463  * BSG support
 464  */
 465 /**
 466  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
 467  * @job: bsg job to be processed
 468  */
 469 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
 470 {
 471         struct Scsi_Host *shost = iscsi_job_to_shost(job);
 472         struct iscsi_bsg_request *req = job->request;
 473         struct iscsi_bsg_reply *reply = job->reply;
 474         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 475         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
 476         int ret;
 477
 478         /* check if we have the msgcode value at least */
 479         if (job->request_len < sizeof(uint32_t)) {
 480                 ret = -ENOMSG;
 481                 goto fail_host_msg;
 482         }
 483
 484         /* Validate the host command */
 485         switch (req->msgcode) {
 486         case ISCSI_BSG_HST_VENDOR:
 487                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
 488                 if ((shost->hostt->vendor_id == 0L) ||
 489                     (req->rqst_data.h_vendor.vendor_id !=
 490                         shost->hostt->vendor_id)) {
 491                         ret = -ESRCH;
 492                         goto fail_host_msg;
 493                 }
 494                 break;
 495         default:
 496                 ret = -EBADR;
 497                 goto fail_host_msg;
 498         }
 499
 500         /* check if we really have all the request data needed */
 501         if (job->request_len < cmdlen) {
 502                 ret = -ENOMSG;
 503                 goto fail_host_msg;
 504         }
 505
 506         ret = i->iscsi_transport->bsg_request(job);
 507         if (!ret)
 508                 return 0;
 509
 510 fail_host_msg:
 511         /* return the errno failure code as the only status */
 512         BUG_ON(job->reply_len < sizeof(uint32_t));
 513         reply->reply_payload_rcv_len = 0;
 514         reply->result = ret;
 515         job->reply_len = sizeof(uint32_t);
 516         bsg_job_done(job, ret, 0);
 517         return 0;
 518 }
 519
 520 /**
 521  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
 522  * @shost: shost for iscsi_host
 523  * @ihost: iscsi_cls_host adding the structures to
 524  */
 525 static int
 526 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
 527 {
 528         struct device *dev = &shost->shost_gendev;
 529         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
 530         struct request_queue *q;
 531         char bsg_name[20];
 532         int ret;
 533
 534         if (!i->iscsi_transport->bsg_request)
 535                 return -ENOTSUPP;
 536
 537         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
 538
 539         q = __scsi_alloc_queue(shost, bsg_request_fn);
 540         if (!q)
 541                 return -ENOMEM;
 542
 543         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
 544         if (ret) {
 545                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
 546                              "initialize - no request queue\n");
 547                 blk_cleanup_queue(q);
 548                 return ret;
 549         }
 550
 551         ihost->bsg_q = q;
 552         return 0;
 553 }
 554
 555 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 556                             struct device *cdev)
 557 {
 558         struct Scsi_Host *shost = dev_to_shost(dev);
 559         struct iscsi_cls_host *ihost = shost->shost_data;
 560
 561         memset(ihost, 0, sizeof(*ihost));
 562         atomic_set(&ihost->nr_scans, 0);
 563         mutex_init(&ihost->mutex);
 564
 565         iscsi_bsg_host_add(shost, ihost);
 566         /* ignore any bsg add error - we just can't do sgio */
 567
 568         return 0;
 569 }
 570
 571 static int iscsi_remove_host(struct transport_container *tc,
 572                              struct device *dev, struct device *cdev)
 573 {
 574         struct Scsi_Host *shost = dev_to_shost(dev);
 575         struct iscsi_cls_host *ihost = shost->shost_data;
 576
 577         if (ihost->bsg_q) {
 578                 bsg_remove_queue(ihost->bsg_q);
 579                 blk_cleanup_queue(ihost->bsg_q);
 580         }
 581         return 0;
 582 }
 583
 584 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 585                                "iscsi_host",
 586                                iscsi_setup_host,
 587                                iscsi_remove_host,
 588                                NULL);
 589
 590 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 591                                "iscsi_session",
 592                                NULL,
 593                                NULL,
 594                                NULL);
 595
 596 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 597                                "iscsi_connection",
 598                                NULL,
 599                                NULL,
 600                                NULL);
 601
 602 static struct sock *nls;
 603 static DEFINE_MUTEX(rx_queue_mutex);
 604
 605 static LIST_HEAD(sesslist);
 606 static DEFINE_SPINLOCK(sesslock);
 607 static LIST_HEAD(connlist);
 608 static DEFINE_SPINLOCK(connlock);
 609
 610 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 611 {
 612         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 613         return sess->sid;
 614 }
 615
 616 /*
 617  * Returns the matching session to a given sid
 618  */
 619 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 620 {
 621         unsigned long flags;
 622         struct iscsi_cls_session *sess;
 623
 624         spin_lock_irqsave(&sesslock, flags);
 625         list_for_each_entry(sess, &sesslist, sess_list) {
 626                 if (sess->sid == sid) {
 627                         spin_unlock_irqrestore(&sesslock, flags);
 628                         return sess;
 629                 }
 630         }
 631         spin_unlock_irqrestore(&sesslock, flags);
 632         return NULL;
 633 }
 634
 635 /*
 636  * Returns the matching connection to a given sid / cid tuple
 637  */
 638 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 639 {
 640         unsigned long flags;
 641         struct iscsi_cls_conn *conn;
 642
 643         spin_lock_irqsave(&connlock, flags);
 644         list_for_each_entry(conn, &connlist, conn_list) {
 645                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 646                         spin_unlock_irqrestore(&connlock, flags);
 647                         return conn;
 648                 }
 649         }
 650         spin_unlock_irqrestore(&connlock, flags);
 651         return NULL;
 652 }
 653
 654 /*
 655  * The following functions can be used by LLDs that allocate
 656  * their own scsi_hosts or by software iscsi LLDs
 657  */
 658 static struct {
 659         int value;
 660         char *name;
 661 } iscsi_session_state_names[] = {
 662         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 663         { ISCSI_SESSION_FAILED,         "FAILED" },
 664         { ISCSI_SESSION_FREE,           "FREE" },
 665 };
 666
 667 static const char *iscsi_session_state_name(int state)
 668 {
 669         int i;
 670         char *name = NULL;
 671
 672         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 673                 if (iscsi_session_state_names[i].value == state) {
 674                         name = iscsi_session_state_names[i].name;
 675                         break;
 676                 }
 677         }
 678         return name;
 679 }
 680
 681 int iscsi_session_chkready(struct iscsi_cls_session *session)
 682 {
 683         unsigned long flags;
 684         int err;
 685
 686         spin_lock_irqsave(&session->lock, flags);
 687         switch (session->state) {
 688         case ISCSI_SESSION_LOGGED_IN:
 689                 err = 0;
 690                 break;
 691         case ISCSI_SESSION_FAILED:
 692                 err = DID_IMM_RETRY << 16;
 693                 break;
 694         case ISCSI_SESSION_FREE:
 695                 err = DID_TRANSPORT_FAILFAST << 16;
 696                 break;
 697         default:
 698                 err = DID_NO_CONNECT << 16;
 699                 break;
 700         }
 701         spin_unlock_irqrestore(&session->lock, flags);
 702         return err;
 703 }
 704 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 705
 706 int iscsi_is_session_online(struct iscsi_cls_session *session)
 707 {
 708         unsigned long flags;
 709         int ret = 0;
 710
 711         spin_lock_irqsave(&session->lock, flags);
 712         if (session->state == ISCSI_SESSION_LOGGED_IN)
 713                 ret = 1;
 714         spin_unlock_irqrestore(&session->lock, flags);
 715         return ret;
 716 }
 717 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
 718
 719 static void iscsi_session_release(struct device *dev)
 720 {
 721         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 722         struct Scsi_Host *shost;
 723
 724         shost = iscsi_session_to_shost(session);
 725         scsi_host_put(shost);
 726         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 727         kfree(session);
 728 }
 729
 730 static int iscsi_is_session_dev(const struct device *dev)
 731 {
 732         return dev->release == iscsi_session_release;
 733 }
 734
 735 static int iscsi_iter_session_fn(struct device *dev, void *data)
 736 {
 737         void (* fn) (struct iscsi_cls_session *) = data;
 738
 739         if (!iscsi_is_session_dev(dev))
 740                 return 0;
 741         fn(iscsi_dev_to_session(dev));
 742         return 0;
 743 }
 744
 745 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 746                                  void (*fn)(struct iscsi_cls_session *))
 747 {
 748         device_for_each_child(&shost->shost_gendev, fn,
 749                               iscsi_iter_session_fn);
 750 }
 751 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 752
 753 /**
 754  * iscsi_scan_finished - helper to report when running scans are done
 755  * @shost: scsi host
 756  * @time: scan run time
 757  *
 758  * This function can be used by drives like qla4xxx to report to the scsi
 759  * layer when the scans it kicked off at module load time are done.
 760  */
 761 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 762 {
 763         struct iscsi_cls_host *ihost = shost->shost_data;
 764         /*
 765          * qla4xxx will have kicked off some session unblocks before calling
 766          * scsi_scan_host, so just wait for them to complete.
 767          */
 768         return !atomic_read(&ihost->nr_scans);
 769 }
 770 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 771
 772 struct iscsi_scan_data {
 773         unsigned int channel;
 774         unsigned int id;
 775         unsigned int lun;
 776 };
 777
 778 static int iscsi_user_scan_session(struct device *dev, void *data)
 779 {
 780         struct iscsi_scan_data *scan_data = data;
 781         struct iscsi_cls_session *session;
 782         struct Scsi_Host *shost;
 783         struct iscsi_cls_host *ihost;
 784         unsigned long flags;
 785         unsigned int id;
 786
 787         if (!iscsi_is_session_dev(dev))
 788                 return 0;
 789
 790         session = iscsi_dev_to_session(dev);
 791
 792         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 793
 794         shost = iscsi_session_to_shost(session);
 795         ihost = shost->shost_data;
 796
 797         mutex_lock(&ihost->mutex);
 798         spin_lock_irqsave(&session->lock, flags);
 799         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 800                 spin_unlock_irqrestore(&session->lock, flags);
 801                 goto user_scan_exit;
 802         }
 803         id = session->target_id;
 804         spin_unlock_irqrestore(&session->lock, flags);
 805
 806         if (id != ISCSI_MAX_TARGET) {
 807                 if ((scan_data->channel == SCAN_WILD_CARD ||
 808                      scan_data->channel == 0) &&
 809                     (scan_data->id == SCAN_WILD_CARD ||
 810                      scan_data->id == id))
 811                         scsi_scan_target(&session->dev, 0, id,
 812                                          scan_data->lun, 1);
 813         }
 814
 815 user_scan_exit:
 816         mutex_unlock(&ihost->mutex);
 817         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 818         return 0;
 819 }
 820
 821 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 822                            uint id, uint lun)
 823 {
 824         struct iscsi_scan_data scan_data;
 825
 826         scan_data.channel = channel;
 827         scan_data.id = id;
 828         scan_data.lun = lun;
 829
 830         return device_for_each_child(&shost->shost_gendev, &scan_data,
 831                                      iscsi_user_scan_session);
 832 }
 833
 834 static void iscsi_scan_session(struct work_struct *work)
 835 {
 836         struct iscsi_cls_session *session =
 837                         container_of(work, struct iscsi_cls_session, scan_work);
 838         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 839         struct iscsi_cls_host *ihost = shost->shost_data;
 840         struct iscsi_scan_data scan_data;
 841
 842         scan_data.channel = 0;
 843         scan_data.id = SCAN_WILD_CARD;
 844         scan_data.lun = SCAN_WILD_CARD;
 845
 846         iscsi_user_scan_session(&session->dev, &scan_data);
 847         atomic_dec(&ihost->nr_scans);
 848 }
 849
 850 /**
 851  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 852  * @cmd: scsi cmd passed to scsi eh handler
 853  *
 854  * If the session is down this function will wait for the recovery
 855  * timer to fire or for the session to be logged back in. If the
 856  * recovery timer fires then FAST_IO_FAIL is returned. The caller
 857  * should pass this error value to the scsi eh.
 858  */
 859 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 860 {
 861         struct iscsi_cls_session *session =
 862                         starget_to_session(scsi_target(cmd->device));
 863         unsigned long flags;
 864         int ret = 0;
 865
 866         spin_lock_irqsave(&session->lock, flags);
 867         while (session->state != ISCSI_SESSION_LOGGED_IN) {
 868                 if (session->state == ISCSI_SESSION_FREE) {
 869                         ret = FAST_IO_FAIL;
 870                         break;
 871                 }
 872                 spin_unlock_irqrestore(&session->lock, flags);
 873                 msleep(1000);
 874                 spin_lock_irqsave(&session->lock, flags);
 875         }
 876         spin_unlock_irqrestore(&session->lock, flags);
 877         return ret;
 878 }
 879 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 880
 881 static void session_recovery_timedout(struct work_struct *work)
 882 {
 883         struct iscsi_cls_session *session =
 884                 container_of(work, struct iscsi_cls_session,
 885                              recovery_work.work);
 886         unsigned long flags;
 887
 888         iscsi_cls_session_printk(KERN_INFO, session,
 889                                  "session recovery timed out after %d secs\n",
 890                                  session->recovery_tmo);
 891
 892         spin_lock_irqsave(&session->lock, flags);
 893         switch (session->state) {
 894         case ISCSI_SESSION_FAILED:
 895                 session->state = ISCSI_SESSION_FREE;
 896                 break;
 897         case ISCSI_SESSION_LOGGED_IN:
 898         case ISCSI_SESSION_FREE:
 899                 /* we raced with the unblock's flush */
 900                 spin_unlock_irqrestore(&session->lock, flags);
 901                 return;
 902         }
 903         spin_unlock_irqrestore(&session->lock, flags);
 904
 905         if (session->transport->session_recovery_timedout)
 906                 session->transport->session_recovery_timedout(session);
 907
 908         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 909         scsi_target_unblock(&session->dev);
 910         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 911 }
 912
 913 static void __iscsi_unblock_session(struct work_struct *work)
 914 {
 915         struct iscsi_cls_session *session =
 916                         container_of(work, struct iscsi_cls_session,
 917                                      unblock_work);
 918         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 919         struct iscsi_cls_host *ihost = shost->shost_data;
 920         unsigned long flags;
 921
 922         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 923         /*
 924          * The recovery and unblock work get run from the same workqueue,
 925          * so try to cancel it if it was going to run after this unblock.
 926          */
 927         cancel_delayed_work(&session->recovery_work);
 928         spin_lock_irqsave(&session->lock, flags);
 929         session->state = ISCSI_SESSION_LOGGED_IN;
 930         spin_unlock_irqrestore(&session->lock, flags);
 931         /* start IO */
 932         scsi_target_unblock(&session->dev);
 933         /*
 934          * Only do kernel scanning if the driver is properly hooked into
 935          * the async scanning code (drivers like iscsi_tcp do login and
 936          * scanning from userspace).
 937          */
 938         if (shost->hostt->scan_finished) {
 939                 if (scsi_queue_work(shost, &session->scan_work))
 940                         atomic_inc(&ihost->nr_scans);
 941         }
 942         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 943 }
 944
 945 /**
 946  * iscsi_unblock_session - set a session as logged in and start IO.
 947  * @session: iscsi session
 948  *
 949  * Mark a session as ready to accept IO.
 950  */
 951 void iscsi_unblock_session(struct iscsi_cls_session *session)
 952 {
 953         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 954         /*
 955          * make sure all the events have completed before tell the driver
 956          * it is safe
 957          */
 958         flush_workqueue(iscsi_eh_timer_workq);
 959 }
 960 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 961
 962 static void __iscsi_block_session(struct work_struct *work)
 963 {
 964         struct iscsi_cls_session *session =
 965                         container_of(work, struct iscsi_cls_session,
 966                                      block_work);
 967         unsigned long flags;
 968
 969         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 970         spin_lock_irqsave(&session->lock, flags);
 971         session->state = ISCSI_SESSION_FAILED;
 972         spin_unlock_irqrestore(&session->lock, flags);
 973         scsi_target_block(&session->dev);
 974         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 975         if (session->recovery_tmo >= 0)
 976                 queue_delayed_work(iscsi_eh_timer_workq,
 977                                    &session->recovery_work,
 978                                    session->recovery_tmo * HZ);
 979 }
 980
 981 void iscsi_block_session(struct iscsi_cls_session *session)
 982 {
 983         queue_work(iscsi_eh_timer_workq, &session->block_work);
 984 }
 985 EXPORT_SYMBOL_GPL(iscsi_block_session);
 986
 987 static void __iscsi_unbind_session(struct work_struct *work)
 988 {
 989         struct iscsi_cls_session *session =
 990                         container_of(work, struct iscsi_cls_session,
 991                                      unbind_work);
 992         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 993         struct iscsi_cls_host *ihost = shost->shost_data;
 994         unsigned long flags;
 995         unsigned int target_id;
 996
 997         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 998
 999         /* Prevent new scans and make sure scanning is not in progress */
1000         mutex_lock(&ihost->mutex);
1001         spin_lock_irqsave(&session->lock, flags);
1002         if (session->target_id == ISCSI_MAX_TARGET) {
1003                 spin_unlock_irqrestore(&session->lock, flags);
1004                 mutex_unlock(&ihost->mutex);
1005                 return;
1006         }
1007
1008         target_id = session->target_id;
1009         session->target_id = ISCSI_MAX_TARGET;
1010         spin_unlock_irqrestore(&session->lock, flags);
1011         mutex_unlock(&ihost->mutex);
1012
1013         if (session->ida_used)
1014                 ida_simple_remove(&iscsi_sess_ida, target_id);
1015
1016         scsi_remove_target(&session->dev);
1017         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1018         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1019 }
1020
1021 struct iscsi_cls_session *
1022 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1023                     int dd_size)
1024 {
1025         struct iscsi_cls_session *session;
1026
1027         session = kzalloc(sizeof(*session) + dd_size,
1028                           GFP_KERNEL);
1029         if (!session)
1030                 return NULL;
1031
1032         session->transport = transport;
1033         session->creator = -1;
1034         session->recovery_tmo = 120;
1035         session->state = ISCSI_SESSION_FREE;
1036         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1037         INIT_LIST_HEAD(&session->sess_list);
1038         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1039         INIT_WORK(&session->block_work, __iscsi_block_session);
1040         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1041         INIT_WORK(&session->scan_work, iscsi_scan_session);
1042         spin_lock_init(&session->lock);
1043
1044         /* this is released in the dev's release function */
1045         scsi_host_get(shost);
1046         session->dev.parent = &shost->shost_gendev;
1047         session->dev.release = iscsi_session_release;
1048         device_initialize(&session->dev);
1049         if (dd_size)
1050                 session->dd_data = &session[1];
1051
1052         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1053         return session;
1054 }
1055 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1056
1057 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1058 {
1059         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1060         struct iscsi_cls_host *ihost;
1061         unsigned long flags;
1062         int id = 0;
1063         int err;
1064
1065         ihost = shost->shost_data;
1066         session->sid = atomic_add_return(1, &iscsi_session_nr);
1067
1068         if (target_id == ISCSI_MAX_TARGET) {
1069                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
1070
1071                 if (id < 0) {
1072                         iscsi_cls_session_printk(KERN_ERR, session,
1073                                         "Failure in Target ID Allocation\n");
1074                         return id;
1075                 }
1076                 session->target_id = (unsigned int)id;
1077                 session->ida_used = true;
1078         } else
1079                 session->target_id = target_id;
1080
1081         dev_set_name(&session->dev, "session%u", session->sid);
1082         err = device_add(&session->dev);
1083         if (err) {
1084                 iscsi_cls_session_printk(KERN_ERR, session,
1085                                          "could not register session's dev\n");
1086                 goto release_ida;
1087         }
1088         transport_register_device(&session->dev);
1089
1090         spin_lock_irqsave(&sesslock, flags);
1091         list_add(&session->sess_list, &sesslist);
1092         spin_unlock_irqrestore(&sesslock, flags);
1093
1094         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1095         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1096         return 0;
1097
1098 release_ida:
1099         if (session->ida_used)
1100                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
1101
1102         return err;
1103 }
1104 EXPORT_SYMBOL_GPL(iscsi_add_session);
1105
1106 /**
1107  * iscsi_create_session - create iscsi class session
1108  * @shost: scsi host
1109  * @transport: iscsi transport
1110  * @dd_size: private driver data size
1111  * @target_id: which target
1112  *
1113  * This can be called from a LLD or iscsi_transport.
1114  */
1115 struct iscsi_cls_session *
1116 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1117                      int dd_size, unsigned int target_id)
1118 {
1119         struct iscsi_cls_session *session;
1120
1121         session = iscsi_alloc_session(shost, transport, dd_size);
1122         if (!session)
1123                 return NULL;
1124
1125         if (iscsi_add_session(session, target_id)) {
1126                 iscsi_free_session(session);
1127                 return NULL;
1128         }
1129         return session;
1130 }
1131 EXPORT_SYMBOL_GPL(iscsi_create_session);
1132
1133 static void iscsi_conn_release(struct device *dev)
1134 {
1135         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1136         struct device *parent = conn->dev.parent;
1137
1138         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1139         kfree(conn);
1140         put_device(parent);
1141 }
1142
1143 static int iscsi_is_conn_dev(const struct device *dev)
1144 {
1145         return dev->release == iscsi_conn_release;
1146 }
1147
1148 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1149 {
1150         if (!iscsi_is_conn_dev(dev))
1151                 return 0;
1152         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1153 }
1154
1155 void iscsi_remove_session(struct iscsi_cls_session *session)
1156 {
1157         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1158         unsigned long flags;
1159         int err;
1160
1161         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1162
1163         spin_lock_irqsave(&sesslock, flags);
1164         list_del(&session->sess_list);
1165         spin_unlock_irqrestore(&sesslock, flags);
1166
1167         /* make sure there are no blocks/unblocks queued */
1168         flush_workqueue(iscsi_eh_timer_workq);
1169         /* make sure the timedout callout is not running */
1170         if (!cancel_delayed_work(&session->recovery_work))
1171                 flush_workqueue(iscsi_eh_timer_workq);
1172         /*
1173          * If we are blocked let commands flow again. The lld or iscsi
1174          * layer should set up the queuecommand to fail commands.
1175          * We assume that LLD will not be calling block/unblock while
1176          * removing the session.
1177          */
1178         spin_lock_irqsave(&session->lock, flags);
1179         session->state = ISCSI_SESSION_FREE;
1180         spin_unlock_irqrestore(&session->lock, flags);
1181
1182         scsi_target_unblock(&session->dev);
1183         /* flush running scans then delete devices */
1184         scsi_flush_work(shost);
1185         __iscsi_unbind_session(&session->unbind_work);
1186
1187         /* hw iscsi may not have removed all connections from session */
1188         err = device_for_each_child(&session->dev, NULL,
1189                                     iscsi_iter_destroy_conn_fn);
1190         if (err)
1191                 iscsi_cls_session_printk(KERN_ERR, session,
1192                                          "Could not delete all connections "
1193                                          "for session. Error %d.\n", err);
1194
1195         transport_unregister_device(&session->dev);
1196
1197         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1198         device_del(&session->dev);
1199 }
1200 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1201
1202 void iscsi_free_session(struct iscsi_cls_session *session)
1203 {
1204         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1205         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1206         put_device(&session->dev);
1207 }
1208 EXPORT_SYMBOL_GPL(iscsi_free_session);
1209
1210 /**
1211  * iscsi_destroy_session - destroy iscsi session
1212  * @session: iscsi_session
1213  *
1214  * Can be called by a LLD or iscsi_transport. There must not be
1215  * any running connections.
1216  */
1217 int iscsi_destroy_session(struct iscsi_cls_session *session)
1218 {
1219         iscsi_remove_session(session);
1220         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1221         iscsi_free_session(session);
1222         return 0;
1223 }
1224 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1225
1226 /**
1227  * iscsi_create_conn - create iscsi class connection
1228  * @session: iscsi cls session
1229  * @dd_size: private driver data size
1230  * @cid: connection id
1231  *
1232  * This can be called from a LLD or iscsi_transport. The connection
1233  * is child of the session so cid must be unique for all connections
1234  * on the session.
1235  *
1236  * Since we do not support MCS, cid will normally be zero. In some cases
1237  * for software iscsi we could be trying to preallocate a connection struct
1238  * in which case there could be two connection structs and cid would be
1239  * non-zero.
1240  */
1241 struct iscsi_cls_conn *
1242 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1243 {
1244         struct iscsi_transport *transport = session->transport;
1245         struct iscsi_cls_conn *conn;
1246         unsigned long flags;
1247         int err;
1248
1249         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1250         if (!conn)
1251                 return NULL;
1252         if (dd_size)
1253                 conn->dd_data = &conn[1];
1254
1255         mutex_init(&conn->ep_mutex);
1256         INIT_LIST_HEAD(&conn->conn_list);
1257         conn->transport = transport;
1258         conn->cid = cid;
1259
1260         /* this is released in the dev's release function */
1261         if (!get_device(&session->dev))
1262                 goto free_conn;
1263
1264         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1265         conn->dev.parent = &session->dev;
1266         conn->dev.release = iscsi_conn_release;
1267         err = device_register(&conn->dev);
1268         if (err) {
1269                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1270                                          "register connection's dev\n");
1271                 goto release_parent_ref;
1272         }
1273         transport_register_device(&conn->dev);
1274
1275         spin_lock_irqsave(&connlock, flags);
1276         list_add(&conn->conn_list, &connlist);
1277         spin_unlock_irqrestore(&connlock, flags);
1278
1279         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1280         return conn;
1281
1282 release_parent_ref:
1283         put_device(&session->dev);
1284 free_conn:
1285         kfree(conn);
1286         return NULL;
1287 }
1288
1289 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1290
1291 /**
1292  * iscsi_destroy_conn - destroy iscsi class connection
1293  * @conn: iscsi cls session
1294  *
1295  * This can be called from a LLD or iscsi_transport.
1296  */
1297 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1298 {
1299         unsigned long flags;
1300
1301         spin_lock_irqsave(&connlock, flags);
1302         list_del(&conn->conn_list);
1303         spin_unlock_irqrestore(&connlock, flags);
1304
1305         transport_unregister_device(&conn->dev);
1306         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1307         device_unregister(&conn->dev);
1308         return 0;
1309 }
1310 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1311
1312 /*
1313  * iscsi interface functions
1314  */
1315 static struct iscsi_internal *
1316 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1317 {
1318         struct iscsi_internal *priv;
1319         unsigned long flags;
1320
1321         spin_lock_irqsave(&iscsi_transport_lock, flags);
1322         list_for_each_entry(priv, &iscsi_transports, list) {
1323                 if (tt == priv->iscsi_transport) {
1324                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1325                         return priv;
1326                 }
1327         }
1328         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1329         return NULL;
1330 }
1331
1332 static int
1333 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1334 {
1335         return nlmsg_multicast(nls, skb, 0, group, gfp);
1336 }
1337
1338 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1339                    char *data, uint32_t data_size)
1340 {
1341         struct nlmsghdr *nlh;
1342         struct sk_buff *skb;
1343         struct iscsi_uevent *ev;
1344         char *pdu;
1345         struct iscsi_internal *priv;
1346         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1347                               data_size);
1348
1349         priv = iscsi_if_transport_lookup(conn->transport);
1350         if (!priv)
1351                 return -EINVAL;
1352
1353         skb = alloc_skb(len, GFP_ATOMIC);
1354         if (!skb) {
1355                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1356                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1357                                       "control PDU: OOM\n");
1358                 return -ENOMEM;
1359         }
1360
1361         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1362         ev = NLMSG_DATA(nlh);
1363         memset(ev, 0, sizeof(*ev));
1364         ev->transport_handle = iscsi_handle(conn->transport);
1365         ev->type = ISCSI_KEVENT_RECV_PDU;
1366         ev->r.recv_req.cid = conn->cid;
1367         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1368         pdu = (char*)ev + sizeof(*ev);
1369         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1370         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1371
1372         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1373 }
1374 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1375
1376 int iscsi_offload_mesg(struct Scsi_Host *shost,
1377                        struct iscsi_transport *transport, uint32_t type,
1378                        char *data, uint16_t data_size)
1379 {
1380         struct nlmsghdr *nlh;
1381         struct sk_buff *skb;
1382         struct iscsi_uevent *ev;
1383         int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1384
1385         skb = alloc_skb(len, GFP_ATOMIC);
1386         if (!skb) {
1387                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1388                 return -ENOMEM;
1389         }
1390
1391         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1392         ev = NLMSG_DATA(nlh);
1393         memset(ev, 0, sizeof(*ev));
1394         ev->type = type;
1395         ev->transport_handle = iscsi_handle(transport);
1396         switch (type) {
1397         case ISCSI_KEVENT_PATH_REQ:
1398                 ev->r.req_path.host_no = shost->host_no;
1399                 break;
1400         case ISCSI_KEVENT_IF_DOWN:
1401                 ev->r.notify_if_down.host_no = shost->host_no;
1402                 break;
1403         }
1404
1405         memcpy((char *)ev + sizeof(*ev), data, data_size);
1406
1407         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1408 }
1409 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1410
1411 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1412 {
1413         struct nlmsghdr *nlh;
1414         struct sk_buff  *skb;
1415         struct iscsi_uevent *ev;
1416         struct iscsi_internal *priv;
1417         int len = NLMSG_SPACE(sizeof(*ev));
1418
1419         priv = iscsi_if_transport_lookup(conn->transport);
1420         if (!priv)
1421                 return;
1422
1423         skb = alloc_skb(len, GFP_ATOMIC);
1424         if (!skb) {
1425                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1426                                       "conn error (%d)\n", error);
1427                 return;
1428         }
1429
1430         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1431         ev = NLMSG_DATA(nlh);
1432         ev->transport_handle = iscsi_handle(conn->transport);
1433         ev->type = ISCSI_KEVENT_CONN_ERROR;
1434         ev->r.connerror.error = error;
1435         ev->r.connerror.cid = conn->cid;
1436         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1437
1438         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1439
1440         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1441                               error);
1442 }
1443 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1444
1445 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1446                             enum iscsi_conn_state state)
1447 {
1448         struct nlmsghdr *nlh;
1449         struct sk_buff  *skb;
1450         struct iscsi_uevent *ev;
1451         struct iscsi_internal *priv;
1452         int len = NLMSG_SPACE(sizeof(*ev));
1453
1454         priv = iscsi_if_transport_lookup(conn->transport);
1455         if (!priv)
1456                 return;
1457
1458         skb = alloc_skb(len, GFP_ATOMIC);
1459         if (!skb) {
1460                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1461                                       "conn login (%d)\n", state);
1462                 return;
1463         }
1464
1465         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1466         ev = NLMSG_DATA(nlh);
1467         ev->transport_handle = iscsi_handle(conn->transport);
1468         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1469         ev->r.conn_login.state = state;
1470         ev->r.conn_login.cid = conn->cid;
1471         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1472         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1473
1474         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1475                               state);
1476 }
1477 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1478
1479 static int
1480 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1481                     void *payload, int size)
1482 {
1483         struct sk_buff  *skb;
1484         struct nlmsghdr *nlh;
1485         int len = NLMSG_SPACE(size);
1486         int flags = multi ? NLM_F_MULTI : 0;
1487         int t = done ? NLMSG_DONE : type;
1488
1489         skb = alloc_skb(len, GFP_ATOMIC);
1490         if (!skb) {
1491                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1492                 return -ENOMEM;
1493         }
1494
1495         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1496         nlh->nlmsg_flags = flags;
1497         memcpy(NLMSG_DATA(nlh), payload, size);
1498         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1499 }
1500
1501 static int
1502 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1503 {
1504         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1505         struct iscsi_stats *stats;
1506         struct sk_buff *skbstat;
1507         struct iscsi_cls_conn *conn;
1508         struct nlmsghdr *nlhstat;
1509         struct iscsi_uevent *evstat;
1510         struct iscsi_internal *priv;
1511         int len = NLMSG_SPACE(sizeof(*ev) +
1512                               sizeof(struct iscsi_stats) +
1513                               sizeof(struct iscsi_stats_custom) *
1514                               ISCSI_STATS_CUSTOM_MAX);
1515         int err = 0;
1516
1517         priv = iscsi_if_transport_lookup(transport);
1518         if (!priv)
1519                 return -EINVAL;
1520
1521         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1522         if (!conn)
1523                 return -EEXIST;
1524
1525         do {
1526                 int actual_size;
1527
1528                 skbstat = alloc_skb(len, GFP_ATOMIC);
1529                 if (!skbstat) {
1530                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1531                                               "deliver stats: OOM\n");
1532                         return -ENOMEM;
1533                 }
1534
1535                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1536                                       (len - sizeof(*nlhstat)), 0);
1537                 evstat = NLMSG_DATA(nlhstat);
1538                 memset(evstat, 0, sizeof(*evstat));
1539                 evstat->transport_handle = iscsi_handle(conn->transport);
1540                 evstat->type = nlh->nlmsg_type;
1541                 evstat->u.get_stats.cid =
1542                         ev->u.get_stats.cid;
1543                 evstat->u.get_stats.sid =
1544                         ev->u.get_stats.sid;
1545                 stats = (struct iscsi_stats *)
1546                         ((char*)evstat + sizeof(*evstat));
1547                 memset(stats, 0, sizeof(*stats));
1548
1549                 transport->get_stats(conn, stats);
1550                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1551                                           sizeof(struct iscsi_stats) +
1552                                           sizeof(struct iscsi_stats_custom) *
1553                                           stats->custom_length);
1554                 actual_size -= sizeof(*nlhstat);
1555                 actual_size = NLMSG_LENGTH(actual_size);
1556                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1557                 nlhstat->nlmsg_len = actual_size;
1558
1559                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1560                                           GFP_ATOMIC);
1561         } while (err < 0 && err != -ECONNREFUSED);
1562
1563         return err;
1564 }
1565
1566 /**
1567  * iscsi_session_event - send session destr. completion event
1568  * @session: iscsi class session
1569  * @event: type of event
1570  */
1571 int iscsi_session_event(struct iscsi_cls_session *session,
1572                         enum iscsi_uevent_e event)
1573 {
1574         struct iscsi_internal *priv;
1575         struct Scsi_Host *shost;
1576         struct iscsi_uevent *ev;
1577         struct sk_buff  *skb;
1578         struct nlmsghdr *nlh;
1579         int rc, len = NLMSG_SPACE(sizeof(*ev));
1580
1581         priv = iscsi_if_transport_lookup(session->transport);
1582         if (!priv)
1583                 return -EINVAL;
1584         shost = iscsi_session_to_shost(session);
1585
1586         skb = alloc_skb(len, GFP_KERNEL);
1587         if (!skb) {
1588                 iscsi_cls_session_printk(KERN_ERR, session,
1589                                          "Cannot notify userspace of session "
1590                                          "event %u\n", event);
1591                 return -ENOMEM;
1592         }
1593
1594         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1595         ev = NLMSG_DATA(nlh);
1596         ev->transport_handle = iscsi_handle(session->transport);
1597
1598         ev->type = event;
1599         switch (event) {
1600         case ISCSI_KEVENT_DESTROY_SESSION:
1601                 ev->r.d_session.host_no = shost->host_no;
1602                 ev->r.d_session.sid = session->sid;
1603                 break;
1604         case ISCSI_KEVENT_CREATE_SESSION:
1605                 ev->r.c_session_ret.host_no = shost->host_no;
1606                 ev->r.c_session_ret.sid = session->sid;
1607                 break;
1608         case ISCSI_KEVENT_UNBIND_SESSION:
1609                 ev->r.unbind_session.host_no = shost->host_no;
1610                 ev->r.unbind_session.sid = session->sid;
1611                 break;
1612         default:
1613                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1614                                          "%u.\n", event);
1615                 kfree_skb(skb);
1616                 return -EINVAL;
1617         }
1618
1619         /*
1620          * this will occur if the daemon is not up, so we just warn
1621          * the user and when the daemon is restarted it will handle it
1622          */
1623         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1624         if (rc == -ESRCH)
1625                 iscsi_cls_session_printk(KERN_ERR, session,
1626                                          "Cannot notify userspace of session "
1627                                          "event %u. Check iscsi daemon\n",
1628                                          event);
1629
1630         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1631                                 event, rc);
1632         return rc;
1633 }
1634 EXPORT_SYMBOL_GPL(iscsi_session_event);
1635
1636 static int
1637 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1638                         struct iscsi_uevent *ev, pid_t pid,
1639                         uint32_t initial_cmdsn, uint16_t cmds_max,
1640                         uint16_t queue_depth)
1641 {
1642         struct iscsi_transport *transport = priv->iscsi_transport;
1643         struct iscsi_cls_session *session;
1644         struct Scsi_Host *shost;
1645
1646         session = transport->create_session(ep, cmds_max, queue_depth,
1647                                             initial_cmdsn);
1648         if (!session)
1649                 return -ENOMEM;
1650
1651         session->creator = pid;
1652         shost = iscsi_session_to_shost(session);
1653         ev->r.c_session_ret.host_no = shost->host_no;
1654         ev->r.c_session_ret.sid = session->sid;
1655         ISCSI_DBG_TRANS_SESSION(session,
1656                                 "Completed creating transport session\n");
1657         return 0;
1658 }
1659
1660 static int
1661 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1662 {
1663         struct iscsi_cls_conn *conn;
1664         struct iscsi_cls_session *session;
1665
1666         session = iscsi_session_lookup(ev->u.c_conn.sid);
1667         if (!session) {
1668                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1669                        ev->u.c_conn.sid);
1670                 return -EINVAL;
1671         }
1672
1673         conn = transport->create_conn(session, ev->u.c_conn.cid);
1674         if (!conn) {
1675                 iscsi_cls_session_printk(KERN_ERR, session,
1676                                          "couldn't create a new connection.");
1677                 return -ENOMEM;
1678         }
1679
1680         ev->r.c_conn_ret.sid = session->sid;
1681         ev->r.c_conn_ret.cid = conn->cid;
1682
1683         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1684         return 0;
1685 }
1686
1687 static int
1688 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1689 {
1690         struct iscsi_cls_conn *conn;
1691
1692         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1693         if (!conn)
1694                 return -EINVAL;
1695
1696         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1697         if (transport->destroy_conn)
1698                 transport->destroy_conn(conn);
1699
1700         return 0;
1701 }
1702
1703 static int
1704 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1705 {
1706         char *data = (char*)ev + sizeof(*ev);
1707         struct iscsi_cls_conn *conn;
1708         struct iscsi_cls_session *session;
1709         int err = 0, value = 0;
1710
1711         session = iscsi_session_lookup(ev->u.set_param.sid);
1712         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1713         if (!conn || !session)
1714                 return -EINVAL;
1715
1716         switch (ev->u.set_param.param) {
1717         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1718                 sscanf(data, "%d", &value);
1719                 session->recovery_tmo = value;
1720                 break;
1721         default:
1722                 err = transport->set_param(conn, ev->u.set_param.param,
1723                                            data, ev->u.set_param.len);
1724         }
1725
1726         return err;
1727 }
1728
1729 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1730                                struct iscsi_uevent *ev, int msg_type)
1731 {
1732         struct iscsi_endpoint *ep;
1733         struct sockaddr *dst_addr;
1734         struct Scsi_Host *shost = NULL;
1735         int non_blocking, err = 0;
1736
1737         if (!transport->ep_connect)
1738                 return -EINVAL;
1739
1740         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1741                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1742                 if (!shost) {
1743                         printk(KERN_ERR "ep connect failed. Could not find "
1744                                "host no %u\n",
1745                                ev->u.ep_connect_through_host.host_no);
1746                         return -ENODEV;
1747                 }
1748                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1749         } else
1750                 non_blocking = ev->u.ep_connect.non_blocking;
1751
1752         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1753         ep = transport->ep_connect(shost, dst_addr, non_blocking);
1754         if (IS_ERR(ep)) {
1755                 err = PTR_ERR(ep);
1756                 goto release_host;
1757         }
1758
1759         ev->r.ep_connect_ret.handle = ep->id;
1760 release_host:
1761         if (shost)
1762                 scsi_host_put(shost);
1763         return err;
1764 }
1765
1766 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1767                                   u64 ep_handle)
1768 {
1769         struct iscsi_cls_conn *conn;
1770         struct iscsi_endpoint *ep;
1771
1772         if (!transport->ep_disconnect)
1773                 return -EINVAL;
1774
1775         ep = iscsi_lookup_endpoint(ep_handle);
1776         if (!ep)
1777                 return -EINVAL;
1778         conn = ep->conn;
1779         if (conn) {
1780                 mutex_lock(&conn->ep_mutex);
1781                 conn->ep = NULL;
1782                 mutex_unlock(&conn->ep_mutex);
1783         }
1784
1785         transport->ep_disconnect(ep);
1786         return 0;
1787 }
1788
1789 static int
1790 iscsi_if_transport_ep(struct iscsi_transport *transport,
1791                       struct iscsi_uevent *ev, int msg_type)
1792 {
1793         struct iscsi_endpoint *ep;
1794         int rc = 0;
1795
1796         switch (msg_type) {
1797         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1798         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1799                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1800                 break;
1801         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1802                 if (!transport->ep_poll)
1803                         return -EINVAL;
1804
1805                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1806                 if (!ep)
1807                         return -EINVAL;
1808
1809                 ev->r.retcode = transport->ep_poll(ep,
1810                                                    ev->u.ep_poll.timeout_ms);
1811                 break;
1812         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1813                 rc = iscsi_if_ep_disconnect(transport,
1814                                             ev->u.ep_disconnect.ep_handle);
1815                 break;
1816         }
1817         return rc;
1818 }
1819
1820 static int
1821 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1822                 struct iscsi_uevent *ev)
1823 {
1824         struct Scsi_Host *shost;
1825         struct sockaddr *dst_addr;
1826         int err;
1827
1828         if (!transport->tgt_dscvr)
1829                 return -EINVAL;
1830
1831         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1832         if (!shost) {
1833                 printk(KERN_ERR "target discovery could not find host no %u\n",
1834                        ev->u.tgt_dscvr.host_no);
1835                 return -ENODEV;
1836         }
1837
1838
1839         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1840         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1841                                    ev->u.tgt_dscvr.enable, dst_addr);
1842         scsi_host_put(shost);
1843         return err;
1844 }
1845
1846 static int
1847 iscsi_set_host_param(struct iscsi_transport *transport,
1848                      struct iscsi_uevent *ev)
1849 {
1850         char *data = (char*)ev + sizeof(*ev);
1851         struct Scsi_Host *shost;
1852         int err;
1853
1854         if (!transport->set_host_param)
1855                 return -ENOSYS;
1856
1857         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1858         if (!shost) {
1859                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1860                        ev->u.set_host_param.host_no);
1861                 return -ENODEV;
1862         }
1863
1864         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1865                                         data, ev->u.set_host_param.len);
1866         scsi_host_put(shost);
1867         return err;
1868 }
1869
1870 static int
1871 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1872 {
1873         struct Scsi_Host *shost;
1874         struct iscsi_path *params;
1875         int err;
1876
1877         if (!transport->set_path)
1878                 return -ENOSYS;
1879
1880         shost = scsi_host_lookup(ev->u.set_path.host_no);
1881         if (!shost) {
1882                 printk(KERN_ERR "set path could not find host no %u\n",
1883                        ev->u.set_path.host_no);
1884                 return -ENODEV;
1885         }
1886
1887         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1888         err = transport->set_path(shost, params);
1889
1890         scsi_host_put(shost);
1891         return err;
1892 }
1893
1894 static int
1895 iscsi_set_iface_params(struct iscsi_transport *transport,
1896                        struct iscsi_uevent *ev, uint32_t len)
1897 {
1898         char *data = (char *)ev + sizeof(*ev);
1899         struct Scsi_Host *shost;
1900         int err;
1901
1902         if (!transport->set_iface_param)
1903                 return -ENOSYS;
1904
1905         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1906         if (!shost) {
1907                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1908                        ev->u.set_iface_params.host_no);
1909                 return -ENODEV;
1910         }
1911
1912         err = transport->set_iface_param(shost, data, len);
1913         scsi_host_put(shost);
1914         return err;
1915 }
1916
1917 static int
1918 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1919 {
1920         int err = 0;
1921         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1922         struct iscsi_transport *transport = NULL;
1923         struct iscsi_internal *priv;
1924         struct iscsi_cls_session *session;
1925         struct iscsi_cls_conn *conn;
1926         struct iscsi_endpoint *ep = NULL;
1927
1928         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1929                 *group = ISCSI_NL_GRP_UIP;
1930         else
1931                 *group = ISCSI_NL_GRP_ISCSID;
1932
1933         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1934         if (!priv)
1935                 return -EINVAL;
1936         transport = priv->iscsi_transport;
1937
1938         if (!try_module_get(transport->owner))
1939                 return -EINVAL;
1940
1941         switch (nlh->nlmsg_type) {
1942         case ISCSI_UEVENT_CREATE_SESSION:
1943                 err = iscsi_if_create_session(priv, ep, ev,
1944                                               NETLINK_CREDS(skb)->pid,
1945                                               ev->u.c_session.initial_cmdsn,
1946                                               ev->u.c_session.cmds_max,
1947                                               ev->u.c_session.queue_depth);
1948                 break;
1949         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1950                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1951                 if (!ep) {
1952                         err = -EINVAL;
1953                         break;
1954                 }
1955
1956                 err = iscsi_if_create_session(priv, ep, ev,
1957                                         NETLINK_CREDS(skb)->pid,
1958                                         ev->u.c_bound_session.initial_cmdsn,
1959                                         ev->u.c_bound_session.cmds_max,
1960                                         ev->u.c_bound_session.queue_depth);
1961                 break;
1962         case ISCSI_UEVENT_DESTROY_SESSION:
1963                 session = iscsi_session_lookup(ev->u.d_session.sid);
1964                 if (session)
1965                         transport->destroy_session(session);
1966                 else
1967                         err = -EINVAL;
1968                 break;
1969         case ISCSI_UEVENT_UNBIND_SESSION:
1970                 session = iscsi_session_lookup(ev->u.d_session.sid);
1971                 if (session)
1972                         scsi_queue_work(iscsi_session_to_shost(session),
1973                                         &session->unbind_work);
1974                 else
1975                         err = -EINVAL;
1976                 break;
1977         case ISCSI_UEVENT_CREATE_CONN:
1978                 err = iscsi_if_create_conn(transport, ev);
1979                 break;
1980         case ISCSI_UEVENT_DESTROY_CONN:
1981                 err = iscsi_if_destroy_conn(transport, ev);
1982                 break;
1983         case ISCSI_UEVENT_BIND_CONN:
1984                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1985                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1986
1987                 if (conn && conn->ep)
1988                         iscsi_if_ep_disconnect(transport, conn->ep->id);
1989
1990                 if (!session || !conn) {
1991                         err = -EINVAL;
1992                         break;
1993                 }
1994
1995                 ev->r.retcode = transport->bind_conn(session, conn,
1996                                                 ev->u.b_conn.transport_eph,
1997                                                 ev->u.b_conn.is_leading);
1998                 if (ev->r.retcode || !transport->ep_connect)
1999                         break;
2000
2001                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2002                 if (ep) {
2003                         ep->conn = conn;
2004
2005                         mutex_lock(&conn->ep_mutex);
2006                         conn->ep = ep;
2007                         mutex_unlock(&conn->ep_mutex);
2008                 } else
2009                         iscsi_cls_conn_printk(KERN_ERR, conn,
2010                                               "Could not set ep conn "
2011                                               "binding\n");
2012                 break;
2013         case ISCSI_UEVENT_SET_PARAM:
2014                 err = iscsi_set_param(transport, ev);
2015                 break;
2016         case ISCSI_UEVENT_START_CONN:
2017                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
2018                 if (conn)
2019                         ev->r.retcode = transport->start_conn(conn);
2020                 else
2021                         err = -EINVAL;
2022                 break;
2023         case ISCSI_UEVENT_STOP_CONN:
2024                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2025                 if (conn)
2026                         transport->stop_conn(conn, ev->u.stop_conn.flag);
2027                 else
2028                         err = -EINVAL;
2029                 break;
2030         case ISCSI_UEVENT_SEND_PDU:
2031                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
2032                 if (conn)
2033                         ev->r.retcode = transport->send_pdu(conn,
2034                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2035                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2036                                 ev->u.send_pdu.data_size);
2037                 else
2038                         err = -EINVAL;
2039                 break;
2040         case ISCSI_UEVENT_GET_STATS:
2041                 err = iscsi_if_get_stats(transport, nlh);
2042                 break;
2043         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2044         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2045         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2046         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2047                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2048                 break;
2049         case ISCSI_UEVENT_TGT_DSCVR:
2050                 err = iscsi_tgt_dscvr(transport, ev);
2051                 break;
2052         case ISCSI_UEVENT_SET_HOST_PARAM:
2053                 err = iscsi_set_host_param(transport, ev);
2054                 break;
2055         case ISCSI_UEVENT_PATH_UPDATE:
2056                 err = iscsi_set_path(transport, ev);
2057                 break;
2058         case ISCSI_UEVENT_SET_IFACE_PARAMS:
2059                 err = iscsi_set_iface_params(transport, ev,
2060                                              nlmsg_attrlen(nlh, sizeof(*ev)));
2061                 break;
2062         default:
2063                 err = -ENOSYS;
2064                 break;
2065         }
2066
2067         module_put(transport->owner);
2068         return err;
2069 }
2070
2071 /*
2072  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
2073  * Malformed skbs with wrong lengths or invalid creds are not processed.
2074  */
2075 static void
2076 iscsi_if_rx(struct sk_buff *skb)
2077 {
2078         mutex_lock(&rx_queue_mutex);
2079         while (skb->len >= NLMSG_SPACE(0)) {
2080                 int err;
2081                 uint32_t rlen;
2082                 struct nlmsghdr *nlh;
2083                 struct iscsi_uevent *ev;
2084                 uint32_t group;
2085
2086                 nlh = nlmsg_hdr(skb);
2087                 if (nlh->nlmsg_len < sizeof(*nlh) ||
2088                     skb->len < nlh->nlmsg_len) {
2089                         break;
2090                 }
2091
2092                 ev = NLMSG_DATA(nlh);
2093                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2094                 if (rlen > skb->len)
2095                         rlen = skb->len;
2096
2097                 err = iscsi_if_recv_msg(skb, nlh, &group);
2098                 if (err) {
2099                         ev->type = ISCSI_KEVENT_IF_ERROR;
2100                         ev->iferror = err;
2101                 }
2102                 do {
2103                         /*
2104                          * special case for GET_STATS:
2105                          * on success - sending reply and stats from
2106                          * inside of if_recv_msg(),
2107                          * on error - fall through.
2108                          */
2109                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2110                                 break;
2111                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
2112                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2113                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
2114                 skb_pull(skb, rlen);
2115         }
2116         mutex_unlock(&rx_queue_mutex);
2117 }
2118
2119 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
2120 struct device_attribute dev_attr_##_prefix##_##_name =  \
2121         __ATTR(_name,_mode,_show,_store)
2122
2123 /*
2124  * iSCSI connection attrs
2125  */
2126 #define iscsi_conn_attr_show(param)                                     \
2127 static ssize_t                                                          \
2128 show_conn_param_##param(struct device *dev,                             \
2129                         struct device_attribute *attr, char *buf)       \
2130 {                                                                       \
2131         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2132         struct iscsi_transport *t = conn->transport;                    \
2133         return t->get_conn_param(conn, param, buf);                     \
2134 }
2135
2136 #define iscsi_conn_attr(field, param)                                   \
2137         iscsi_conn_attr_show(param)                                     \
2138 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
2139                         NULL);
2140
2141 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2142 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2143 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2144 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2145 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2146 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2147 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
2148 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2149 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
2150 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2151 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
2152
2153 #define iscsi_conn_ep_attr_show(param)                                  \
2154 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
2155                                           struct device_attribute *attr,\
2156                                           char *buf)                    \
2157 {                                                                       \
2158         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2159         struct iscsi_transport *t = conn->transport;                    \
2160         struct iscsi_endpoint *ep;                                      \
2161         ssize_t rc;                                                     \
2162                                                                         \
2163         /*                                                              \
2164          * Need to make sure ep_disconnect does not free the LLD's      \
2165          * interconnect resources while we are trying to read them.     \
2166          */                                                             \
2167         mutex_lock(&conn->ep_mutex);                                    \
2168         ep = conn->ep;                                                  \
2169         if (!ep && t->ep_connect) {                                     \
2170                 mutex_unlock(&conn->ep_mutex);                          \
2171                 return -ENOTCONN;                                       \
2172         }                                                               \
2173                                                                         \
2174         if (ep)                                                         \
2175                 rc = t->get_ep_param(ep, param, buf);                   \
2176         else                                                            \
2177                 rc = t->get_conn_param(conn, param, buf);               \
2178         mutex_unlock(&conn->ep_mutex);                                  \
2179         return rc;                                                      \
2180 }
2181
2182 #define iscsi_conn_ep_attr(field, param)                                \
2183         iscsi_conn_ep_attr_show(param)                                  \
2184 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2185                         show_conn_ep_param_##param, NULL);
2186
2187 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2188 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2189
2190 static struct attribute *iscsi_conn_attrs[] = {
2191         &dev_attr_conn_max_recv_dlength.attr,
2192         &dev_attr_conn_max_xmit_dlength.attr,
2193         &dev_attr_conn_header_digest.attr,
2194         &dev_attr_conn_data_digest.attr,
2195         &dev_attr_conn_ifmarker.attr,
2196         &dev_attr_conn_ofmarker.attr,
2197         &dev_attr_conn_address.attr,
2198         &dev_attr_conn_port.attr,
2199         &dev_attr_conn_exp_statsn.attr,
2200         &dev_attr_conn_persistent_address.attr,
2201         &dev_attr_conn_persistent_port.attr,
2202         &dev_attr_conn_ping_tmo.attr,
2203         &dev_attr_conn_recv_tmo.attr,
2204         NULL,
2205 };
2206
2207 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2208                                          struct attribute *attr, int i)
2209 {
2210         struct device *cdev = container_of(kobj, struct device, kobj);
2211         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2212         struct iscsi_transport *t = conn->transport;
2213         int param;
2214
2215         if (attr == &dev_attr_conn_max_recv_dlength.attr)
2216                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2217         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2218                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2219         else if (attr == &dev_attr_conn_header_digest.attr)
2220                 param = ISCSI_PARAM_HDRDGST_EN;
2221         else if (attr == &dev_attr_conn_data_digest.attr)
2222                 param = ISCSI_PARAM_DATADGST_EN;
2223         else if (attr == &dev_attr_conn_ifmarker.attr)
2224                 param = ISCSI_PARAM_IFMARKER_EN;
2225         else if (attr == &dev_attr_conn_ofmarker.attr)
2226                 param = ISCSI_PARAM_OFMARKER_EN;
2227         else if (attr == &dev_attr_conn_address.attr)
2228                 param = ISCSI_PARAM_CONN_ADDRESS;
2229         else if (attr == &dev_attr_conn_port.attr)
2230                 param = ISCSI_PARAM_CONN_PORT;
2231         else if (attr == &dev_attr_conn_exp_statsn.attr)
2232                 param = ISCSI_PARAM_EXP_STATSN;
2233         else if (attr == &dev_attr_conn_persistent_address.attr)
2234                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2235         else if (attr == &dev_attr_conn_persistent_port.attr)
2236                 param = ISCSI_PARAM_PERSISTENT_PORT;
2237         else if (attr == &dev_attr_conn_ping_tmo.attr)
2238                 param = ISCSI_PARAM_PING_TMO;
2239         else if (attr == &dev_attr_conn_recv_tmo.attr)
2240                 param = ISCSI_PARAM_RECV_TMO;
2241         else {
2242                 WARN_ONCE(1, "Invalid conn attr");
2243                 return 0;
2244         }
2245
2246         return t->attr_is_visible(ISCSI_PARAM, param);
2247 }
2248
2249 static struct attribute_group iscsi_conn_group = {
2250         .attrs = iscsi_conn_attrs,
2251         .is_visible = iscsi_conn_attr_is_visible,
2252 };
2253
2254 /*
2255  * iSCSI session attrs
2256  */
2257 #define iscsi_session_attr_show(param, perm)                            \
2258 static ssize_t                                                          \
2259 show_session_param_##param(struct device *dev,                          \
2260                            struct device_attribute *attr, char *buf)    \
2261 {                                                                       \
2262         struct iscsi_cls_session *session =                             \
2263                 iscsi_dev_to_session(dev->parent);                      \
2264         struct iscsi_transport *t = session->transport;                 \
2265                                                                         \
2266         if (perm && !capable(CAP_SYS_ADMIN))                            \
2267                 return -EACCES;                                         \
2268         return t->get_session_param(session, param, buf);               \
2269 }
2270
2271 #define iscsi_session_attr(field, param, perm)                          \
2272         iscsi_session_attr_show(param, perm)                            \
2273 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2274                         NULL);
2275 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2276 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2277 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2278 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2279 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2280 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2281 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2282 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2283 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2284 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2285 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2286 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2287 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2288 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2289 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2290 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2291 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2292 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2293 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2294 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2295 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2296
2297 static ssize_t
2298 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2299                         char *buf)
2300 {
2301         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2302         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2303 }
2304 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2305                         NULL);
2306 static ssize_t
2307 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
2308                         char *buf)
2309 {
2310         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2311         return sprintf(buf, "%d\n", session->creator);
2312 }
2313 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
2314                         NULL);
2315
2316 #define iscsi_priv_session_attr_show(field, format)                     \
2317 static ssize_t                                                          \
2318 show_priv_session_##field(struct device *dev,                           \
2319                           struct device_attribute *attr, char *buf)     \
2320 {                                                                       \
2321         struct iscsi_cls_session *session =                             \
2322                         iscsi_dev_to_session(dev->parent);              \
2323         if (session->field == -1)                                       \
2324                 return sprintf(buf, "off\n");                           \
2325         return sprintf(buf, format"\n", session->field);                \
2326 }
2327
2328 #define iscsi_priv_session_attr_store(field)                            \
2329 static ssize_t                                                          \
2330 store_priv_session_##field(struct device *dev,                          \
2331                            struct device_attribute *attr,               \
2332                            const char *buf, size_t count)               \
2333 {                                                                       \
2334         int val;                                                        \
2335         char *cp;                                                       \
2336         struct iscsi_cls_session *session =                             \
2337                 iscsi_dev_to_session(dev->parent);                      \
2338         if ((session->state == ISCSI_SESSION_FREE) ||                   \
2339             (session->state == ISCSI_SESSION_FAILED))                   \
2340                 return -EBUSY;                                          \
2341         if (strncmp(buf, "off", 3) == 0)                                \
2342                 session->field = -1;                                    \
2343         else {                                                          \
2344                 val = simple_strtoul(buf, &cp, 0);                      \
2345                 if (*cp != '\0' && *cp != '\n')                         \
2346                         return -EINVAL;                                 \
2347                 session->field = val;                                   \
2348         }                                                               \
2349         return count;                                                   \
2350 }
2351
2352 #define iscsi_priv_session_rw_attr(field, format)                       \
2353         iscsi_priv_session_attr_show(field, format)                     \
2354         iscsi_priv_session_attr_store(field)                            \
2355 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2356                         show_priv_session_##field,                      \
2357                         store_priv_session_##field)
2358 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2359
2360 static struct attribute *iscsi_session_attrs[] = {
2361         &dev_attr_sess_initial_r2t.attr,
2362         &dev_attr_sess_max_outstanding_r2t.attr,
2363         &dev_attr_sess_immediate_data.attr,
2364         &dev_attr_sess_first_burst_len.attr,
2365         &dev_attr_sess_max_burst_len.attr,
2366         &dev_attr_sess_data_pdu_in_order.attr,
2367         &dev_attr_sess_data_seq_in_order.attr,
2368         &dev_attr_sess_erl.attr,
2369         &dev_attr_sess_targetname.attr,
2370         &dev_attr_sess_tpgt.attr,
2371         &dev_attr_sess_password.attr,
2372         &dev_attr_sess_password_in.attr,
2373         &dev_attr_sess_username.attr,
2374         &dev_attr_sess_username_in.attr,
2375         &dev_attr_sess_fast_abort.attr,
2376         &dev_attr_sess_abort_tmo.attr,
2377         &dev_attr_sess_lu_reset_tmo.attr,
2378         &dev_attr_sess_tgt_reset_tmo.attr,
2379         &dev_attr_sess_ifacename.attr,
2380         &dev_attr_sess_initiatorname.attr,
2381         &dev_attr_sess_targetalias.attr,
2382         &dev_attr_priv_sess_recovery_tmo.attr,
2383         &dev_attr_priv_sess_state.attr,
2384         &dev_attr_priv_sess_creator.attr,
2385         NULL,
2386 };
2387
2388 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2389                                             struct attribute *attr, int i)
2390 {
2391         struct device *cdev = container_of(kobj, struct device, kobj);
2392         struct iscsi_cls_session *session = transport_class_to_session(cdev);
2393         struct iscsi_transport *t = session->transport;
2394         int param;
2395
2396         if (attr == &dev_attr_sess_initial_r2t.attr)
2397                 param = ISCSI_PARAM_INITIAL_R2T_EN;
2398         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2399                 param = ISCSI_PARAM_MAX_R2T;
2400         else if (attr == &dev_attr_sess_immediate_data.attr)
2401                 param = ISCSI_PARAM_IMM_DATA_EN;
2402         else if (attr == &dev_attr_sess_first_burst_len.attr)
2403                 param = ISCSI_PARAM_FIRST_BURST;
2404         else if (attr == &dev_attr_sess_max_burst_len.attr)
2405                 param = ISCSI_PARAM_MAX_BURST;
2406         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2407                 param = ISCSI_PARAM_PDU_INORDER_EN;
2408         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2409                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2410         else if (attr == &dev_attr_sess_erl.attr)
2411                 param = ISCSI_PARAM_ERL;
2412         else if (attr == &dev_attr_sess_targetname.attr)
2413                 param = ISCSI_PARAM_TARGET_NAME;
2414         else if (attr == &dev_attr_sess_tpgt.attr)
2415                 param = ISCSI_PARAM_TPGT;
2416         else if (attr == &dev_attr_sess_password.attr)
2417                 param = ISCSI_PARAM_USERNAME;
2418         else if (attr == &dev_attr_sess_password_in.attr)
2419                 param = ISCSI_PARAM_USERNAME_IN;
2420         else if (attr == &dev_attr_sess_username.attr)
2421                 param = ISCSI_PARAM_PASSWORD;
2422         else if (attr == &dev_attr_sess_username_in.attr)
2423                 param = ISCSI_PARAM_PASSWORD_IN;
2424         else if (attr == &dev_attr_sess_fast_abort.attr)
2425                 param = ISCSI_PARAM_FAST_ABORT;
2426         else if (attr == &dev_attr_sess_abort_tmo.attr)
2427                 param = ISCSI_PARAM_ABORT_TMO;
2428         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2429                 param = ISCSI_PARAM_LU_RESET_TMO;
2430         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2431                 param = ISCSI_PARAM_TGT_RESET_TMO;
2432         else if (attr == &dev_attr_sess_ifacename.attr)
2433                 param = ISCSI_PARAM_IFACE_NAME;
2434         else if (attr == &dev_attr_sess_initiatorname.attr)
2435                 param = ISCSI_PARAM_INITIATOR_NAME;
2436         else if (attr == &dev_attr_sess_targetalias.attr)
2437                 param = ISCSI_PARAM_TARGET_ALIAS;
2438         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2439                 return S_IRUGO | S_IWUSR;
2440         else if (attr == &dev_attr_priv_sess_state.attr)
2441                 return S_IRUGO;
2442         else if (attr == &dev_attr_priv_sess_creator.attr)
2443                 return S_IRUGO;
2444         else {
2445                 WARN_ONCE(1, "Invalid session attr");
2446                 return 0;
2447         }
2448
2449         return t->attr_is_visible(ISCSI_PARAM, param);
2450 }
2451
2452 static struct attribute_group iscsi_session_group = {
2453         .attrs = iscsi_session_attrs,
2454         .is_visible = iscsi_session_attr_is_visible,
2455 };
2456
2457 /*
2458  * iSCSI host attrs
2459  */
2460 #define iscsi_host_attr_show(param)                                     \
2461 static ssize_t                                                          \
2462 show_host_param_##param(struct device *dev,                             \
2463                         struct device_attribute *attr, char *buf)       \
2464 {                                                                       \
2465         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2466         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2467         return priv->iscsi_transport->get_host_param(shost, param, buf); \
2468 }
2469
2470 #define iscsi_host_attr(field, param)                                   \
2471         iscsi_host_attr_show(param)                                     \
2472 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2473                         NULL);
2474
2475 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2476 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2477 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2478 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2479 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
2480 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
2481
2482 static struct attribute *iscsi_host_attrs[] = {
2483         &dev_attr_host_netdev.attr,
2484         &dev_attr_host_hwaddress.attr,
2485         &dev_attr_host_ipaddress.attr,
2486         &dev_attr_host_initiatorname.attr,
2487         &dev_attr_host_port_state.attr,
2488         &dev_attr_host_port_speed.attr,
2489         NULL,
2490 };
2491
2492 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2493                                          struct attribute *attr, int i)
2494 {
2495         struct device *cdev = container_of(kobj, struct device, kobj);
2496         struct Scsi_Host *shost = transport_class_to_shost(cdev);
2497         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2498         int param;
2499
2500         if (attr == &dev_attr_host_netdev.attr)
2501                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2502         else if (attr == &dev_attr_host_hwaddress.attr)
2503                 param = ISCSI_HOST_PARAM_HWADDRESS;
2504         else if (attr == &dev_attr_host_ipaddress.attr)
2505                 param = ISCSI_HOST_PARAM_IPADDRESS;
2506         else if (attr == &dev_attr_host_initiatorname.attr)
2507                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2508         else if (attr == &dev_attr_host_port_state.attr)
2509                 param = ISCSI_HOST_PARAM_PORT_STATE;
2510         else if (attr == &dev_attr_host_port_speed.attr)
2511                 param = ISCSI_HOST_PARAM_PORT_SPEED;
2512         else {
2513                 WARN_ONCE(1, "Invalid host attr");
2514                 return 0;
2515         }
2516
2517         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2518 }
2519
2520 static struct attribute_group iscsi_host_group = {
2521         .attrs = iscsi_host_attrs,
2522         .is_visible = iscsi_host_attr_is_visible,
2523 };
2524
2525 /* convert iscsi_port_speed values to ascii string name */
2526 static const struct {
2527         enum iscsi_port_speed   value;
2528         char                    *name;
2529 } iscsi_port_speed_names[] = {
2530         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
2531         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
2532         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
2533         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
2534         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
2535 };
2536
2537 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
2538 {
2539         int i;
2540         char *speed = "Unknown!";
2541         struct iscsi_cls_host *ihost = shost->shost_data;
2542         uint32_t port_speed = ihost->port_speed;
2543
2544         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
2545                 if (iscsi_port_speed_names[i].value & port_speed) {
2546                         speed = iscsi_port_speed_names[i].name;
2547                         break;
2548                 }
2549         }
2550         return speed;
2551 }
2552 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
2553
2554 /* convert iscsi_port_state values to ascii string name */
2555 static const struct {
2556         enum iscsi_port_state   value;
2557         char                    *name;
2558 } iscsi_port_state_names[] = {
2559         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
2560         {ISCSI_PORT_STATE_UP,           "LINK UP" },
2561 };
2562
2563 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
2564 {
2565         int i;
2566         char *state = "Unknown!";
2567         struct iscsi_cls_host *ihost = shost->shost_data;
2568         uint32_t port_state = ihost->port_state;
2569
2570         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
2571                 if (iscsi_port_state_names[i].value & port_state) {
2572                         state = iscsi_port_state_names[i].name;
2573                         break;
2574                 }
2575         }
2576         return state;
2577 }
2578 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
2579
2580 static int iscsi_session_match(struct attribute_container *cont,
2581                            struct device *dev)
2582 {
2583         struct iscsi_cls_session *session;
2584         struct Scsi_Host *shost;
2585         struct iscsi_internal *priv;
2586
2587         if (!iscsi_is_session_dev(dev))
2588                 return 0;
2589
2590         session = iscsi_dev_to_session(dev);
2591         shost = iscsi_session_to_shost(session);
2592         if (!shost->transportt)
2593                 return 0;
2594
2595         priv = to_iscsi_internal(shost->transportt);
2596         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2597                 return 0;
2598
2599         return &priv->session_cont.ac == cont;
2600 }
2601
2602 static int iscsi_conn_match(struct attribute_container *cont,
2603                            struct device *dev)
2604 {
2605         struct iscsi_cls_session *session;
2606         struct iscsi_cls_conn *conn;
2607         struct Scsi_Host *shost;
2608         struct iscsi_internal *priv;
2609
2610         if (!iscsi_is_conn_dev(dev))
2611                 return 0;
2612
2613         conn = iscsi_dev_to_conn(dev);
2614         session = iscsi_dev_to_session(conn->dev.parent);
2615         shost = iscsi_session_to_shost(session);
2616
2617         if (!shost->transportt)
2618                 return 0;
2619
2620         priv = to_iscsi_internal(shost->transportt);
2621         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2622                 return 0;
2623
2624         return &priv->conn_cont.ac == cont;
2625 }
2626
2627 static int iscsi_host_match(struct attribute_container *cont,
2628                             struct device *dev)
2629 {
2630         struct Scsi_Host *shost;
2631         struct iscsi_internal *priv;
2632
2633         if (!scsi_is_host_device(dev))
2634                 return 0;
2635
2636         shost = dev_to_shost(dev);
2637         if (!shost->transportt  ||
2638             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2639                 return 0;
2640
2641         priv = to_iscsi_internal(shost->transportt);
2642         return &priv->t.host_attrs.ac == cont;
2643 }
2644
2645 struct scsi_transport_template *
2646 iscsi_register_transport(struct iscsi_transport *tt)
2647 {
2648         struct iscsi_internal *priv;
2649         unsigned long flags;
2650         int err;
2651
2652         BUG_ON(!tt);
2653
2654         priv = iscsi_if_transport_lookup(tt);
2655         if (priv)
2656                 return NULL;
2657
2658         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2659         if (!priv)
2660                 return NULL;
2661         INIT_LIST_HEAD(&priv->list);
2662         priv->iscsi_transport = tt;
2663         priv->t.user_scan = iscsi_user_scan;
2664         priv->t.create_work_queue = 1;
2665
2666         priv->dev.class = &iscsi_transport_class;
2667         dev_set_name(&priv->dev, "%s", tt->name);
2668         err = device_register(&priv->dev);
2669         if (err)
2670                 goto free_priv;
2671
2672         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2673         if (err)
2674                 goto unregister_dev;
2675
2676         /* host parameters */
2677         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2678         priv->t.host_attrs.ac.match = iscsi_host_match;
2679         priv->t.host_attrs.ac.grp = &iscsi_host_group;
2680         priv->t.host_size = sizeof(struct iscsi_cls_host);
2681         transport_container_register(&priv->t.host_attrs);
2682
2683         /* connection parameters */
2684         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2685         priv->conn_cont.ac.match = iscsi_conn_match;
2686         priv->conn_cont.ac.grp = &iscsi_conn_group;
2687         transport_container_register(&priv->conn_cont);
2688
2689         /* session parameters */
2690         priv->session_cont.ac.class = &iscsi_session_class.class;
2691         priv->session_cont.ac.match = iscsi_session_match;
2692         priv->session_cont.ac.grp = &iscsi_session_group;
2693         transport_container_register(&priv->session_cont);
2694
2695         spin_lock_irqsave(&iscsi_transport_lock, flags);
2696         list_add(&priv->list, &iscsi_transports);
2697         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2698
2699         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2700         return &priv->t;
2701
2702 unregister_dev:
2703         device_unregister(&priv->dev);
2704         return NULL;
2705 free_priv:
2706         kfree(priv);
2707         return NULL;
2708 }
2709 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2710
2711 int iscsi_unregister_transport(struct iscsi_transport *tt)
2712 {
2713         struct iscsi_internal *priv;
2714         unsigned long flags;
2715
2716         BUG_ON(!tt);
2717
2718         mutex_lock(&rx_queue_mutex);
2719
2720         priv = iscsi_if_transport_lookup(tt);
2721         BUG_ON (!priv);
2722
2723         spin_lock_irqsave(&iscsi_transport_lock, flags);
2724         list_del(&priv->list);
2725         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2726
2727         transport_container_unregister(&priv->conn_cont);
2728         transport_container_unregister(&priv->session_cont);
2729         transport_container_unregister(&priv->t.host_attrs);
2730
2731         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2732         device_unregister(&priv->dev);
2733         mutex_unlock(&rx_queue_mutex);
2734
2735         return 0;
2736 }
2737 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2738
2739 static __init int iscsi_transport_init(void)
2740 {
2741         int err;
2742
2743         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2744                 ISCSI_TRANSPORT_VERSION);
2745
2746         atomic_set(&iscsi_session_nr, 0);
2747
2748         err = class_register(&iscsi_transport_class);
2749         if (err)
2750                 return err;
2751
2752         err = class_register(&iscsi_endpoint_class);
2753         if (err)
2754                 goto unregister_transport_class;
2755
2756         err = class_register(&iscsi_iface_class);
2757         if (err)
2758                 goto unregister_endpoint_class;
2759
2760         err = transport_class_register(&iscsi_host_class);
2761         if (err)
2762                 goto unregister_iface_class;
2763
2764         err = transport_class_register(&iscsi_connection_class);
2765         if (err)
2766                 goto unregister_host_class;
2767
2768         err = transport_class_register(&iscsi_session_class);
2769         if (err)
2770                 goto unregister_conn_class;
2771
2772         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2773                                     NULL, THIS_MODULE);
2774         if (!nls) {
2775                 err = -ENOBUFS;
2776                 goto unregister_session_class;
2777         }
2778
2779         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2780         if (!iscsi_eh_timer_workq)
2781                 goto release_nls;
2782
2783         return 0;
2784
2785 release_nls:
2786         netlink_kernel_release(nls);
2787 unregister_session_class:
2788         transport_class_unregister(&iscsi_session_class);
2789 unregister_conn_class:
2790         transport_class_unregister(&iscsi_connection_class);
2791 unregister_host_class:
2792         transport_class_unregister(&iscsi_host_class);
2793 unregister_iface_class:
2794         class_unregister(&iscsi_iface_class);
2795 unregister_endpoint_class:
2796         class_unregister(&iscsi_endpoint_class);
2797 unregister_transport_class:
2798         class_unregister(&iscsi_transport_class);
2799         return err;
2800 }
2801
2802 static void __exit iscsi_transport_exit(void)
2803 {
2804         destroy_workqueue(iscsi_eh_timer_workq);
2805         netlink_kernel_release(nls);
2806         transport_class_unregister(&iscsi_connection_class);
2807         transport_class_unregister(&iscsi_session_class);
2808         transport_class_unregister(&iscsi_host_class);
2809         class_unregister(&iscsi_endpoint_class);
2810         class_unregister(&iscsi_iface_class);
2811         class_unregister(&iscsi_transport_class);
2812 }
2813
2814 module_init(iscsi_transport_init);
2815 module_exit(iscsi_transport_exit);
2816
2817 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2818               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2819               "Alex Aizman <itn780@yahoo.com>");
2820 MODULE_DESCRIPTION("iSCSI Transport Interface");
2821 MODULE_LICENSE("GPL");
2822 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2823 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);