linux/drivers/scsi/scsi_transport_iscsi.c
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   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
  40static int dbg_session;
  41module_param_named(debug_session, dbg_session, int,
  42                   S_IRUGO | S_IWUSR);
  43MODULE_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
  48static int dbg_conn;
  49module_param_named(debug_conn, dbg_conn, int,
  50                   S_IRUGO | S_IWUSR);
  51MODULE_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
  72struct 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
  82static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  83static struct workqueue_struct *iscsi_eh_timer_workq;
  84
  85static 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 */
  91static LIST_HEAD(iscsi_transports);
  92static 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
 100static 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 */
 110static struct class iscsi_transport_class = {
 111        .name = "iscsi_transport",
 112        .dev_release = iscsi_transport_release,
 113};
 114
 115static ssize_t
 116show_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}
 122static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 123
 124#define show_transport_attr(name, format)                               \
 125static ssize_t                                                          \
 126show_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}                                                                       \
 132static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 133
 134show_transport_attr(caps, "0x%x");
 135
 136static struct attribute *iscsi_transport_attrs[] = {
 137        &dev_attr_handle.attr,
 138        &dev_attr_caps.attr,
 139        NULL,
 140};
 141
 142static 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)    \
 153struct device_attribute dev_attr_##_prefix##_##_name =  \
 154        __ATTR(_name,_mode,_show,_store)
 155
 156static void iscsi_endpoint_release(struct device *dev)
 157{
 158        struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 159        kfree(ep);
 160}
 161
 162static struct class iscsi_endpoint_class = {
 163        .name = "iscsi_endpoint",
 164        .dev_release = iscsi_endpoint_release,
 165};
 166
 167static ssize_t
 168show_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}
 173static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 174
 175static struct attribute *iscsi_endpoint_attrs[] = {
 176        &dev_attr_ep_handle.attr,
 177        NULL,
 178};
 179
 180static struct attribute_group iscsi_endpoint_group = {
 181        .attrs = iscsi_endpoint_attrs,
 182};
 183
 184#define ISCSI_MAX_EPID -1
 185
 186static 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
 194struct iscsi_endpoint *
 195iscsi_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
 233unregister_dev:
 234        device_unregister(&ep->dev);
 235        return NULL;
 236
 237free_ep:
 238        kfree(ep);
 239        return NULL;
 240}
 241EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 242
 243void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 244{
 245        sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 246        device_unregister(&ep->dev);
 247}
 248EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 249
 250struct 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}
 268EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 269
 270/*
 271 * Interface to display network param to sysfs
 272 */
 273
 274static 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
 284static 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)  \
 290struct 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)            \
 295static ssize_t                                                          \
 296show_##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)       \
 306static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 307
 308/* generic read only ipvi4 attribute */
 309iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 310iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 311iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 312iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 313
 314/* generic read only ipv6 attribute */
 315iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 316iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 317iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 318iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 319                     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 320iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 321                     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 322
 323/* common read only iface attribute */
 324iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 325iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 326iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 327iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 328iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 329iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 330
 331static 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
 383static 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
 402static struct attribute_group iscsi_iface_group = {
 403        .attrs = iscsi_iface_attrs,
 404        .is_visible = iscsi_iface_attr_is_visible,
 405};
 406
 407struct iscsi_iface *
 408iscsi_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
 444unreg_iface:
 445        device_unregister(&iface->dev);
 446        return NULL;
 447
 448free_iface:
 449        put_device(iface->dev.parent);
 450        kfree(iface);
 451        return NULL;
 452}
 453EXPORT_SYMBOL_GPL(iscsi_create_iface);
 454
 455void iscsi_destroy_iface(struct iscsi_iface *iface)
 456{
 457        sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 458        device_unregister(&iface->dev);
 459}
 460EXPORT_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 */
 469static 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
 510fail_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 */
 525static int
 526iscsi_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
 555static 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
 571static 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_unregister_queue(ihost->bsg_q);
 579                blk_cleanup_queue(ihost->bsg_q);
 580        }
 581        return 0;
 582}
 583
 584static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 585                               "iscsi_host",
 586                               iscsi_setup_host,
 587                               iscsi_remove_host,
 588                               NULL);
 589
 590static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 591                               "iscsi_session",
 592                               NULL,
 593                               NULL,
 594                               NULL);
 595
 596static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 597                               "iscsi_connection",
 598                               NULL,
 599                               NULL,
 600                               NULL);
 601
 602static struct sock *nls;
 603static DEFINE_MUTEX(rx_queue_mutex);
 604
 605static LIST_HEAD(sesslist);
 606static DEFINE_SPINLOCK(sesslock);
 607static LIST_HEAD(connlist);
 608static DEFINE_SPINLOCK(connlock);
 609
 610static 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 */
 619static 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 */
 638static 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 */
 658static 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
 667static 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
 681int 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}
 704EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 705
 706int 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}
 717EXPORT_SYMBOL_GPL(iscsi_is_session_online);
 718
 719static 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
 730int iscsi_is_session_dev(const struct device *dev)
 731{
 732        return dev->release == iscsi_session_release;
 733}
 734EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
 735
 736static int iscsi_iter_session_fn(struct device *dev, void *data)
 737{
 738        void (* fn) (struct iscsi_cls_session *) = data;
 739
 740        if (!iscsi_is_session_dev(dev))
 741                return 0;
 742        fn(iscsi_dev_to_session(dev));
 743        return 0;
 744}
 745
 746void iscsi_host_for_each_session(struct Scsi_Host *shost,
 747                                 void (*fn)(struct iscsi_cls_session *))
 748{
 749        device_for_each_child(&shost->shost_gendev, fn,
 750                              iscsi_iter_session_fn);
 751}
 752EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 753
 754/**
 755 * iscsi_scan_finished - helper to report when running scans are done
 756 * @shost: scsi host
 757 * @time: scan run time
 758 *
 759 * This function can be used by drives like qla4xxx to report to the scsi
 760 * layer when the scans it kicked off at module load time are done.
 761 */
 762int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 763{
 764        struct iscsi_cls_host *ihost = shost->shost_data;
 765        /*
 766         * qla4xxx will have kicked off some session unblocks before calling
 767         * scsi_scan_host, so just wait for them to complete.
 768         */
 769        return !atomic_read(&ihost->nr_scans);
 770}
 771EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 772
 773struct iscsi_scan_data {
 774        unsigned int channel;
 775        unsigned int id;
 776        unsigned int lun;
 777};
 778
 779static int iscsi_user_scan_session(struct device *dev, void *data)
 780{
 781        struct iscsi_scan_data *scan_data = data;
 782        struct iscsi_cls_session *session;
 783        struct Scsi_Host *shost;
 784        struct iscsi_cls_host *ihost;
 785        unsigned long flags;
 786        unsigned int id;
 787
 788        if (!iscsi_is_session_dev(dev))
 789                return 0;
 790
 791        session = iscsi_dev_to_session(dev);
 792
 793        ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 794
 795        shost = iscsi_session_to_shost(session);
 796        ihost = shost->shost_data;
 797
 798        mutex_lock(&ihost->mutex);
 799        spin_lock_irqsave(&session->lock, flags);
 800        if (session->state != ISCSI_SESSION_LOGGED_IN) {
 801                spin_unlock_irqrestore(&session->lock, flags);
 802                goto user_scan_exit;
 803        }
 804        id = session->target_id;
 805        spin_unlock_irqrestore(&session->lock, flags);
 806
 807        if (id != ISCSI_MAX_TARGET) {
 808                if ((scan_data->channel == SCAN_WILD_CARD ||
 809                     scan_data->channel == 0) &&
 810                    (scan_data->id == SCAN_WILD_CARD ||
 811                     scan_data->id == id))
 812                        scsi_scan_target(&session->dev, 0, id,
 813                                         scan_data->lun, 1);
 814        }
 815
 816user_scan_exit:
 817        mutex_unlock(&ihost->mutex);
 818        ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 819        return 0;
 820}
 821
 822static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 823                           uint id, uint lun)
 824{
 825        struct iscsi_scan_data scan_data;
 826
 827        scan_data.channel = channel;
 828        scan_data.id = id;
 829        scan_data.lun = lun;
 830
 831        return device_for_each_child(&shost->shost_gendev, &scan_data,
 832                                     iscsi_user_scan_session);
 833}
 834
 835static void iscsi_scan_session(struct work_struct *work)
 836{
 837        struct iscsi_cls_session *session =
 838                        container_of(work, struct iscsi_cls_session, scan_work);
 839        struct Scsi_Host *shost = iscsi_session_to_shost(session);
 840        struct iscsi_cls_host *ihost = shost->shost_data;
 841        struct iscsi_scan_data scan_data;
 842
 843        scan_data.channel = 0;
 844        scan_data.id = SCAN_WILD_CARD;
 845        scan_data.lun = SCAN_WILD_CARD;
 846
 847        iscsi_user_scan_session(&session->dev, &scan_data);
 848        atomic_dec(&ihost->nr_scans);
 849}
 850
 851/**
 852 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 853 * @cmd: scsi cmd passed to scsi eh handler
 854 *
 855 * If the session is down this function will wait for the recovery
 856 * timer to fire or for the session to be logged back in. If the
 857 * recovery timer fires then FAST_IO_FAIL is returned. The caller
 858 * should pass this error value to the scsi eh.
 859 */
 860int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 861{
 862        struct iscsi_cls_session *session =
 863                        starget_to_session(scsi_target(cmd->device));
 864        unsigned long flags;
 865        int ret = 0;
 866
 867        spin_lock_irqsave(&session->lock, flags);
 868        while (session->state != ISCSI_SESSION_LOGGED_IN) {
 869                if (session->state == ISCSI_SESSION_FREE) {
 870                        ret = FAST_IO_FAIL;
 871                        break;
 872                }
 873                spin_unlock_irqrestore(&session->lock, flags);
 874                msleep(1000);
 875                spin_lock_irqsave(&session->lock, flags);
 876        }
 877        spin_unlock_irqrestore(&session->lock, flags);
 878        return ret;
 879}
 880EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 881
 882static void session_recovery_timedout(struct work_struct *work)
 883{
 884        struct iscsi_cls_session *session =
 885                container_of(work, struct iscsi_cls_session,
 886                             recovery_work.work);
 887        unsigned long flags;
 888
 889        iscsi_cls_session_printk(KERN_INFO, session,
 890                                 "session recovery timed out after %d secs\n",
 891                                 session->recovery_tmo);
 892
 893        spin_lock_irqsave(&session->lock, flags);
 894        switch (session->state) {
 895        case ISCSI_SESSION_FAILED:
 896                session->state = ISCSI_SESSION_FREE;
 897                break;
 898        case ISCSI_SESSION_LOGGED_IN:
 899        case ISCSI_SESSION_FREE:
 900                /* we raced with the unblock's flush */
 901                spin_unlock_irqrestore(&session->lock, flags);
 902                return;
 903        }
 904        spin_unlock_irqrestore(&session->lock, flags);
 905
 906        if (session->transport->session_recovery_timedout)
 907                session->transport->session_recovery_timedout(session);
 908
 909        ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 910        scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
 911        ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 912}
 913
 914static void __iscsi_unblock_session(struct work_struct *work)
 915{
 916        struct iscsi_cls_session *session =
 917                        container_of(work, struct iscsi_cls_session,
 918                                     unblock_work);
 919        struct Scsi_Host *shost = iscsi_session_to_shost(session);
 920        struct iscsi_cls_host *ihost = shost->shost_data;
 921        unsigned long flags;
 922
 923        ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 924        /*
 925         * The recovery and unblock work get run from the same workqueue,
 926         * so try to cancel it if it was going to run after this unblock.
 927         */
 928        cancel_delayed_work(&session->recovery_work);
 929        spin_lock_irqsave(&session->lock, flags);
 930        session->state = ISCSI_SESSION_LOGGED_IN;
 931        spin_unlock_irqrestore(&session->lock, flags);
 932        /* start IO */
 933        scsi_target_unblock(&session->dev, SDEV_RUNNING);
 934        /*
 935         * Only do kernel scanning if the driver is properly hooked into
 936         * the async scanning code (drivers like iscsi_tcp do login and
 937         * scanning from userspace).
 938         */
 939        if (shost->hostt->scan_finished) {
 940                if (scsi_queue_work(shost, &session->scan_work))
 941                        atomic_inc(&ihost->nr_scans);
 942        }
 943        ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 944}
 945
 946/**
 947 * iscsi_unblock_session - set a session as logged in and start IO.
 948 * @session: iscsi session
 949 *
 950 * Mark a session as ready to accept IO.
 951 */
 952void iscsi_unblock_session(struct iscsi_cls_session *session)
 953{
 954        queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 955        /*
 956         * make sure all the events have completed before tell the driver
 957         * it is safe
 958         */
 959        flush_workqueue(iscsi_eh_timer_workq);
 960}
 961EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 962
 963static void __iscsi_block_session(struct work_struct *work)
 964{
 965        struct iscsi_cls_session *session =
 966                        container_of(work, struct iscsi_cls_session,
 967                                     block_work);
 968        unsigned long flags;
 969
 970        ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 971        spin_lock_irqsave(&session->lock, flags);
 972        session->state = ISCSI_SESSION_FAILED;
 973        spin_unlock_irqrestore(&session->lock, flags);
 974        scsi_target_block(&session->dev);
 975        ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 976        if (session->recovery_tmo >= 0)
 977                queue_delayed_work(iscsi_eh_timer_workq,
 978                                   &session->recovery_work,
 979                                   session->recovery_tmo * HZ);
 980}
 981
 982void iscsi_block_session(struct iscsi_cls_session *session)
 983{
 984        queue_work(iscsi_eh_timer_workq, &session->block_work);
 985}
 986EXPORT_SYMBOL_GPL(iscsi_block_session);
 987
 988static void __iscsi_unbind_session(struct work_struct *work)
 989{
 990        struct iscsi_cls_session *session =
 991                        container_of(work, struct iscsi_cls_session,
 992                                     unbind_work);
 993        struct Scsi_Host *shost = iscsi_session_to_shost(session);
 994        struct iscsi_cls_host *ihost = shost->shost_data;
 995        unsigned long flags;
 996        unsigned int target_id;
 997
 998        ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 999
1000        /* Prevent new scans and make sure scanning is not in progress */
1001        mutex_lock(&ihost->mutex);
1002        spin_lock_irqsave(&session->lock, flags);
1003        if (session->target_id == ISCSI_MAX_TARGET) {
1004                spin_unlock_irqrestore(&session->lock, flags);
1005                mutex_unlock(&ihost->mutex);
1006                return;
1007        }
1008
1009        target_id = session->target_id;
1010        session->target_id = ISCSI_MAX_TARGET;
1011        spin_unlock_irqrestore(&session->lock, flags);
1012        mutex_unlock(&ihost->mutex);
1013
1014        if (session->ida_used)
1015                ida_simple_remove(&iscsi_sess_ida, target_id);
1016
1017        scsi_remove_target(&session->dev);
1018        iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1019        ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1020}
1021
1022struct iscsi_cls_session *
1023iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1024                    int dd_size)
1025{
1026        struct iscsi_cls_session *session;
1027
1028        session = kzalloc(sizeof(*session) + dd_size,
1029                          GFP_KERNEL);
1030        if (!session)
1031                return NULL;
1032
1033        session->transport = transport;
1034        session->creator = -1;
1035        session->recovery_tmo = 120;
1036        session->state = ISCSI_SESSION_FREE;
1037        INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
1038        INIT_LIST_HEAD(&session->sess_list);
1039        INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
1040        INIT_WORK(&session->block_work, __iscsi_block_session);
1041        INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
1042        INIT_WORK(&session->scan_work, iscsi_scan_session);
1043        spin_lock_init(&session->lock);
1044
1045        /* this is released in the dev's release function */
1046        scsi_host_get(shost);
1047        session->dev.parent = &shost->shost_gendev;
1048        session->dev.release = iscsi_session_release;
1049        device_initialize(&session->dev);
1050        if (dd_size)
1051                session->dd_data = &session[1];
1052
1053        ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
1054        return session;
1055}
1056EXPORT_SYMBOL_GPL(iscsi_alloc_session);
1057
1058int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
1059{
1060        struct Scsi_Host *shost = iscsi_session_to_shost(session);
1061        struct iscsi_cls_host *ihost;
1062        unsigned long flags;
1063        int id = 0;
1064        int err;
1065
1066        ihost = shost->shost_data;
1067        session->sid = atomic_add_return(1, &iscsi_session_nr);
1068
1069        if (target_id == ISCSI_MAX_TARGET) {
1070                id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
1071
1072                if (id < 0) {
1073                        iscsi_cls_session_printk(KERN_ERR, session,
1074                                        "Failure in Target ID Allocation\n");
1075                        return id;
1076                }
1077                session->target_id = (unsigned int)id;
1078                session->ida_used = true;
1079        } else
1080                session->target_id = target_id;
1081
1082        dev_set_name(&session->dev, "session%u", session->sid);
1083        err = device_add(&session->dev);
1084        if (err) {
1085                iscsi_cls_session_printk(KERN_ERR, session,
1086                                         "could not register session's dev\n");
1087                goto release_ida;
1088        }
1089        transport_register_device(&session->dev);
1090
1091        spin_lock_irqsave(&sesslock, flags);
1092        list_add(&session->sess_list, &sesslist);
1093        spin_unlock_irqrestore(&sesslock, flags);
1094
1095        iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
1096        ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
1097        return 0;
1098
1099release_ida:
1100        if (session->ida_used)
1101                ida_simple_remove(&iscsi_sess_ida, session->target_id);
1102
1103        return err;
1104}
1105EXPORT_SYMBOL_GPL(iscsi_add_session);
1106
1107/**
1108 * iscsi_create_session - create iscsi class session
1109 * @shost: scsi host
1110 * @transport: iscsi transport
1111 * @dd_size: private driver data size
1112 * @target_id: which target
1113 *
1114 * This can be called from a LLD or iscsi_transport.
1115 */
1116struct iscsi_cls_session *
1117iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
1118                     int dd_size, unsigned int target_id)
1119{
1120        struct iscsi_cls_session *session;
1121
1122        session = iscsi_alloc_session(shost, transport, dd_size);
1123        if (!session)
1124                return NULL;
1125
1126        if (iscsi_add_session(session, target_id)) {
1127                iscsi_free_session(session);
1128                return NULL;
1129        }
1130        return session;
1131}
1132EXPORT_SYMBOL_GPL(iscsi_create_session);
1133
1134static void iscsi_conn_release(struct device *dev)
1135{
1136        struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1137        struct device *parent = conn->dev.parent;
1138
1139        ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1140        kfree(conn);
1141        put_device(parent);
1142}
1143
1144static int iscsi_is_conn_dev(const struct device *dev)
1145{
1146        return dev->release == iscsi_conn_release;
1147}
1148
1149static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1150{
1151        if (!iscsi_is_conn_dev(dev))
1152                return 0;
1153        return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1154}
1155
1156void iscsi_remove_session(struct iscsi_cls_session *session)
1157{
1158        struct Scsi_Host *shost = iscsi_session_to_shost(session);
1159        unsigned long flags;
1160        int err;
1161
1162        ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1163
1164        spin_lock_irqsave(&sesslock, flags);
1165        list_del(&session->sess_list);
1166        spin_unlock_irqrestore(&sesslock, flags);
1167
1168        /* make sure there are no blocks/unblocks queued */
1169        flush_workqueue(iscsi_eh_timer_workq);
1170        /* make sure the timedout callout is not running */
1171        if (!cancel_delayed_work(&session->recovery_work))
1172                flush_workqueue(iscsi_eh_timer_workq);
1173        /*
1174         * If we are blocked let commands flow again. The lld or iscsi
1175         * layer should set up the queuecommand to fail commands.
1176         * We assume that LLD will not be calling block/unblock while
1177         * removing the session.
1178         */
1179        spin_lock_irqsave(&session->lock, flags);
1180        session->state = ISCSI_SESSION_FREE;
1181        spin_unlock_irqrestore(&session->lock, flags);
1182
1183        scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1184        /* flush running scans then delete devices */
1185        scsi_flush_work(shost);
1186        __iscsi_unbind_session(&session->unbind_work);
1187
1188        /* hw iscsi may not have removed all connections from session */
1189        err = device_for_each_child(&session->dev, NULL,
1190                                    iscsi_iter_destroy_conn_fn);
1191        if (err)
1192                iscsi_cls_session_printk(KERN_ERR, session,
1193                                         "Could not delete all connections "
1194                                         "for session. Error %d.\n", err);
1195
1196        transport_unregister_device(&session->dev);
1197
1198        ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1199        device_del(&session->dev);
1200}
1201EXPORT_SYMBOL_GPL(iscsi_remove_session);
1202
1203void iscsi_free_session(struct iscsi_cls_session *session)
1204{
1205        ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1206        iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1207        put_device(&session->dev);
1208}
1209EXPORT_SYMBOL_GPL(iscsi_free_session);
1210
1211/**
1212 * iscsi_destroy_session - destroy iscsi session
1213 * @session: iscsi_session
1214 *
1215 * Can be called by a LLD or iscsi_transport. There must not be
1216 * any running connections.
1217 */
1218int iscsi_destroy_session(struct iscsi_cls_session *session)
1219{
1220        iscsi_remove_session(session);
1221        ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1222        iscsi_free_session(session);
1223        return 0;
1224}
1225EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1226
1227/**
1228 * iscsi_create_conn - create iscsi class connection
1229 * @session: iscsi cls session
1230 * @dd_size: private driver data size
1231 * @cid: connection id
1232 *
1233 * This can be called from a LLD or iscsi_transport. The connection
1234 * is child of the session so cid must be unique for all connections
1235 * on the session.
1236 *
1237 * Since we do not support MCS, cid will normally be zero. In some cases
1238 * for software iscsi we could be trying to preallocate a connection struct
1239 * in which case there could be two connection structs and cid would be
1240 * non-zero.
1241 */
1242struct iscsi_cls_conn *
1243iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1244{
1245        struct iscsi_transport *transport = session->transport;
1246        struct iscsi_cls_conn *conn;
1247        unsigned long flags;
1248        int err;
1249
1250        conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1251        if (!conn)
1252                return NULL;
1253        if (dd_size)
1254                conn->dd_data = &conn[1];
1255
1256        mutex_init(&conn->ep_mutex);
1257        INIT_LIST_HEAD(&conn->conn_list);
1258        conn->transport = transport;
1259        conn->cid = cid;
1260
1261        /* this is released in the dev's release function */
1262        if (!get_device(&session->dev))
1263                goto free_conn;
1264
1265        dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1266        conn->dev.parent = &session->dev;
1267        conn->dev.release = iscsi_conn_release;
1268        err = device_register(&conn->dev);
1269        if (err) {
1270                iscsi_cls_session_printk(KERN_ERR, session, "could not "
1271                                         "register connection's dev\n");
1272                goto release_parent_ref;
1273        }
1274        transport_register_device(&conn->dev);
1275
1276        spin_lock_irqsave(&connlock, flags);
1277        list_add(&conn->conn_list, &connlist);
1278        spin_unlock_irqrestore(&connlock, flags);
1279
1280        ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1281        return conn;
1282
1283release_parent_ref:
1284        put_device(&session->dev);
1285free_conn:
1286        kfree(conn);
1287        return NULL;
1288}
1289
1290EXPORT_SYMBOL_GPL(iscsi_create_conn);
1291
1292/**
1293 * iscsi_destroy_conn - destroy iscsi class connection
1294 * @conn: iscsi cls session
1295 *
1296 * This can be called from a LLD or iscsi_transport.
1297 */
1298int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1299{
1300        unsigned long flags;
1301
1302        spin_lock_irqsave(&connlock, flags);
1303        list_del(&conn->conn_list);
1304        spin_unlock_irqrestore(&connlock, flags);
1305
1306        transport_unregister_device(&conn->dev);
1307        ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1308        device_unregister(&conn->dev);
1309        return 0;
1310}
1311EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1312
1313/*
1314 * iscsi interface functions
1315 */
1316static struct iscsi_internal *
1317iscsi_if_transport_lookup(struct iscsi_transport *tt)
1318{
1319        struct iscsi_internal *priv;
1320        unsigned long flags;
1321
1322        spin_lock_irqsave(&iscsi_transport_lock, flags);
1323        list_for_each_entry(priv, &iscsi_transports, list) {
1324                if (tt == priv->iscsi_transport) {
1325                        spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1326                        return priv;
1327                }
1328        }
1329        spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1330        return NULL;
1331}
1332
1333static int
1334iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1335{
1336        return nlmsg_multicast(nls, skb, 0, group, gfp);
1337}
1338
1339int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1340                   char *data, uint32_t data_size)
1341{
1342        struct nlmsghdr *nlh;
1343        struct sk_buff *skb;
1344        struct iscsi_uevent *ev;
1345        char *pdu;
1346        struct iscsi_internal *priv;
1347        int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1348                              data_size);
1349
1350        priv = iscsi_if_transport_lookup(conn->transport);
1351        if (!priv)
1352                return -EINVAL;
1353
1354        skb = alloc_skb(len, GFP_ATOMIC);
1355        if (!skb) {
1356                iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1357                iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1358                                      "control PDU: OOM\n");
1359                return -ENOMEM;
1360        }
1361
1362        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1363        ev = NLMSG_DATA(nlh);
1364        memset(ev, 0, sizeof(*ev));
1365        ev->transport_handle = iscsi_handle(conn->transport);
1366        ev->type = ISCSI_KEVENT_RECV_PDU;
1367        ev->r.recv_req.cid = conn->cid;
1368        ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1369        pdu = (char*)ev + sizeof(*ev);
1370        memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1371        memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1372
1373        return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1374}
1375EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1376
1377int iscsi_offload_mesg(struct Scsi_Host *shost,
1378                       struct iscsi_transport *transport, uint32_t type,
1379                       char *data, uint16_t data_size)
1380{
1381        struct nlmsghdr *nlh;
1382        struct sk_buff *skb;
1383        struct iscsi_uevent *ev;
1384        int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1385
1386        skb = alloc_skb(len, GFP_ATOMIC);
1387        if (!skb) {
1388                printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1389                return -ENOMEM;
1390        }
1391
1392        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1393        ev = NLMSG_DATA(nlh);
1394        memset(ev, 0, sizeof(*ev));
1395        ev->type = type;
1396        ev->transport_handle = iscsi_handle(transport);
1397        switch (type) {
1398        case ISCSI_KEVENT_PATH_REQ:
1399                ev->r.req_path.host_no = shost->host_no;
1400                break;
1401        case ISCSI_KEVENT_IF_DOWN:
1402                ev->r.notify_if_down.host_no = shost->host_no;
1403                break;
1404        }
1405
1406        memcpy((char *)ev + sizeof(*ev), data, data_size);
1407
1408        return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1409}
1410EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1411
1412void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1413{
1414        struct nlmsghdr *nlh;
1415        struct sk_buff  *skb;
1416        struct iscsi_uevent *ev;
1417        struct iscsi_internal *priv;
1418        int len = NLMSG_SPACE(sizeof(*ev));
1419
1420        priv = iscsi_if_transport_lookup(conn->transport);
1421        if (!priv)
1422                return;
1423
1424        skb = alloc_skb(len, GFP_ATOMIC);
1425        if (!skb) {
1426                iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1427                                      "conn error (%d)\n", error);
1428                return;
1429        }
1430
1431        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1432        ev = NLMSG_DATA(nlh);
1433        ev->transport_handle = iscsi_handle(conn->transport);
1434        ev->type = ISCSI_KEVENT_CONN_ERROR;
1435        ev->r.connerror.error = error;
1436        ev->r.connerror.cid = conn->cid;
1437        ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1438
1439        iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1440
1441        iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1442                              error);
1443}
1444EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1445
1446void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
1447                            enum iscsi_conn_state state)
1448{
1449        struct nlmsghdr *nlh;
1450        struct sk_buff  *skb;
1451        struct iscsi_uevent *ev;
1452        struct iscsi_internal *priv;
1453        int len = NLMSG_SPACE(sizeof(*ev));
1454
1455        priv = iscsi_if_transport_lookup(conn->transport);
1456        if (!priv)
1457                return;
1458
1459        skb = alloc_skb(len, GFP_ATOMIC);
1460        if (!skb) {
1461                iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1462                                      "conn login (%d)\n", state);
1463                return;
1464        }
1465
1466        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1467        ev = NLMSG_DATA(nlh);
1468        ev->transport_handle = iscsi_handle(conn->transport);
1469        ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
1470        ev->r.conn_login.state = state;
1471        ev->r.conn_login.cid = conn->cid;
1472        ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
1473        iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1474
1475        iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
1476                              state);
1477}
1478EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
1479
1480void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
1481                           enum iscsi_host_event_code code, uint32_t data_size,
1482                           uint8_t *data)
1483{
1484        struct nlmsghdr *nlh;
1485        struct sk_buff *skb;
1486        struct iscsi_uevent *ev;
1487        int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1488
1489        skb = alloc_skb(len, GFP_NOIO);
1490        if (!skb) {
1491                printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
1492                       host_no, code);
1493                return;
1494        }
1495
1496        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1497        ev = NLMSG_DATA(nlh);
1498        ev->transport_handle = iscsi_handle(transport);
1499        ev->type = ISCSI_KEVENT_HOST_EVENT;
1500        ev->r.host_event.host_no = host_no;
1501        ev->r.host_event.code = code;
1502        ev->r.host_event.data_size = data_size;
1503
1504        if (data_size)
1505                memcpy((char *)ev + sizeof(*ev), data, data_size);
1506
1507        iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
1508}
1509EXPORT_SYMBOL_GPL(iscsi_post_host_event);
1510
1511void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
1512                           uint32_t status, uint32_t pid, uint32_t data_size,
1513                           uint8_t *data)
1514{
1515        struct nlmsghdr *nlh;
1516        struct sk_buff *skb;
1517        struct iscsi_uevent *ev;
1518        int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1519
1520        skb = alloc_skb(len, GFP_NOIO);
1521        if (!skb) {
1522                printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
1523                return;
1524        }
1525
1526        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1527        ev = NLMSG_DATA(nlh);
1528        ev->transport_handle = iscsi_handle(transport);
1529        ev->type = ISCSI_KEVENT_PING_COMP;
1530        ev->r.ping_comp.host_no = host_no;
1531        ev->r.ping_comp.status = status;
1532        ev->r.ping_comp.pid = pid;
1533        ev->r.ping_comp.data_size = data_size;
1534        memcpy((char *)ev + sizeof(*ev), data, data_size);
1535
1536        iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
1537}
1538EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
1539
1540static int
1541iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1542                    void *payload, int size)
1543{
1544        struct sk_buff  *skb;
1545        struct nlmsghdr *nlh;
1546        int len = NLMSG_SPACE(size);
1547        int flags = multi ? NLM_F_MULTI : 0;
1548        int t = done ? NLMSG_DONE : type;
1549
1550        skb = alloc_skb(len, GFP_ATOMIC);
1551        if (!skb) {
1552                printk(KERN_ERR "Could not allocate skb to send reply.\n");
1553                return -ENOMEM;
1554        }
1555
1556        nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1557        nlh->nlmsg_flags = flags;
1558        memcpy(NLMSG_DATA(nlh), payload, size);
1559        return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1560}
1561
1562static int
1563iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1564{
1565        struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1566        struct iscsi_stats *stats;
1567        struct sk_buff *skbstat;
1568        struct iscsi_cls_conn *conn;
1569        struct nlmsghdr *nlhstat;
1570        struct iscsi_uevent *evstat;
1571        struct iscsi_internal *priv;
1572        int len = NLMSG_SPACE(sizeof(*ev) +
1573                              sizeof(struct iscsi_stats) +
1574                              sizeof(struct iscsi_stats_custom) *
1575                              ISCSI_STATS_CUSTOM_MAX);
1576        int err = 0;
1577
1578        priv = iscsi_if_transport_lookup(transport);
1579        if (!priv)
1580                return -EINVAL;
1581
1582        conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1583        if (!conn)
1584                return -EEXIST;
1585
1586        do {
1587                int actual_size;
1588
1589                skbstat = alloc_skb(len, GFP_ATOMIC);
1590                if (!skbstat) {
1591                        iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1592                                              "deliver stats: OOM\n");
1593                        return -ENOMEM;
1594                }
1595
1596                nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1597                                      (len - sizeof(*nlhstat)), 0);
1598                evstat = NLMSG_DATA(nlhstat);
1599                memset(evstat, 0, sizeof(*evstat));
1600                evstat->transport_handle = iscsi_handle(conn->transport);
1601                evstat->type = nlh->nlmsg_type;
1602                evstat->u.get_stats.cid =
1603                        ev->u.get_stats.cid;
1604                evstat->u.get_stats.sid =
1605                        ev->u.get_stats.sid;
1606                stats = (struct iscsi_stats *)
1607                        ((char*)evstat + sizeof(*evstat));
1608                memset(stats, 0, sizeof(*stats));
1609
1610                transport->get_stats(conn, stats);
1611                actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1612                                          sizeof(struct iscsi_stats) +
1613                                          sizeof(struct iscsi_stats_custom) *
1614                                          stats->custom_length);
1615                actual_size -= sizeof(*nlhstat);
1616                actual_size = NLMSG_LENGTH(actual_size);
1617                skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1618                nlhstat->nlmsg_len = actual_size;
1619
1620                err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1621                                          GFP_ATOMIC);
1622        } while (err < 0 && err != -ECONNREFUSED);
1623
1624        return err;
1625}
1626
1627/**
1628 * iscsi_session_event - send session destr. completion event
1629 * @session: iscsi class session
1630 * @event: type of event
1631 */
1632int iscsi_session_event(struct iscsi_cls_session *session,
1633                        enum iscsi_uevent_e event)
1634{
1635        struct iscsi_internal *priv;
1636        struct Scsi_Host *shost;
1637        struct iscsi_uevent *ev;
1638        struct sk_buff  *skb;
1639        struct nlmsghdr *nlh;
1640        int rc, len = NLMSG_SPACE(sizeof(*ev));
1641
1642        priv = iscsi_if_transport_lookup(session->transport);
1643        if (!priv)
1644                return -EINVAL;
1645        shost = iscsi_session_to_shost(session);
1646
1647        skb = alloc_skb(len, GFP_KERNEL);
1648        if (!skb) {
1649                iscsi_cls_session_printk(KERN_ERR, session,
1650                                         "Cannot notify userspace of session "
1651                                         "event %u\n", event);
1652                return -ENOMEM;
1653        }
1654
1655        nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1656        ev = NLMSG_DATA(nlh);
1657        ev->transport_handle = iscsi_handle(session->transport);
1658
1659        ev->type = event;
1660        switch (event) {
1661        case ISCSI_KEVENT_DESTROY_SESSION:
1662                ev->r.d_session.host_no = shost->host_no;
1663                ev->r.d_session.sid = session->sid;
1664                break;
1665        case ISCSI_KEVENT_CREATE_SESSION:
1666                ev->r.c_session_ret.host_no = shost->host_no;
1667                ev->r.c_session_ret.sid = session->sid;
1668                break;
1669        case ISCSI_KEVENT_UNBIND_SESSION:
1670                ev->r.unbind_session.host_no = shost->host_no;
1671                ev->r.unbind_session.sid = session->sid;
1672                break;
1673        default:
1674                iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1675                                         "%u.\n", event);
1676                kfree_skb(skb);
1677                return -EINVAL;
1678        }
1679
1680        /*
1681         * this will occur if the daemon is not up, so we just warn
1682         * the user and when the daemon is restarted it will handle it
1683         */
1684        rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1685        if (rc == -ESRCH)
1686                iscsi_cls_session_printk(KERN_ERR, session,
1687                                         "Cannot notify userspace of session "
1688                                         "event %u. Check iscsi daemon\n",
1689                                         event);
1690
1691        ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1692                                event, rc);
1693        return rc;
1694}
1695EXPORT_SYMBOL_GPL(iscsi_session_event);
1696
1697static int
1698iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1699                        struct iscsi_uevent *ev, pid_t pid,
1700                        uint32_t initial_cmdsn, uint16_t cmds_max,
1701                        uint16_t queue_depth)
1702{
1703        struct iscsi_transport *transport = priv->iscsi_transport;
1704        struct iscsi_cls_session *session;
1705        struct Scsi_Host *shost;
1706
1707        session = transport->create_session(ep, cmds_max, queue_depth,
1708                                            initial_cmdsn);
1709        if (!session)
1710                return -ENOMEM;
1711
1712        session->creator = pid;
1713        shost = iscsi_session_to_shost(session);
1714        ev->r.c_session_ret.host_no = shost->host_no;
1715        ev->r.c_session_ret.sid = session->sid;
1716        ISCSI_DBG_TRANS_SESSION(session,
1717                                "Completed creating transport session\n");
1718        return 0;
1719}
1720
1721static int
1722iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1723{
1724        struct iscsi_cls_conn *conn;
1725        struct iscsi_cls_session *session;
1726
1727        session = iscsi_session_lookup(ev->u.c_conn.sid);
1728        if (!session) {
1729                printk(KERN_ERR "iscsi: invalid session %d.\n",
1730                       ev->u.c_conn.sid);
1731                return -EINVAL;
1732        }
1733
1734        conn = transport->create_conn(session, ev->u.c_conn.cid);
1735        if (!conn) {
1736                iscsi_cls_session_printk(KERN_ERR, session,
1737                                         "couldn't create a new connection.");
1738                return -ENOMEM;
1739        }
1740
1741        ev->r.c_conn_ret.sid = session->sid;
1742        ev->r.c_conn_ret.cid = conn->cid;
1743
1744        ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1745        return 0;
1746}
1747
1748static int
1749iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1750{
1751        struct iscsi_cls_conn *conn;
1752
1753        conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1754        if (!conn)
1755                return -EINVAL;
1756
1757        ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1758        if (transport->destroy_conn)
1759                transport->destroy_conn(conn);
1760
1761        return 0;
1762}
1763
1764static int
1765iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1766{
1767        char *data = (char*)ev + sizeof(*ev);
1768        struct iscsi_cls_conn *conn;
1769        struct iscsi_cls_session *session;
1770        int err = 0, value = 0;
1771
1772        session = iscsi_session_lookup(ev->u.set_param.sid);
1773        conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1774        if (!conn || !session)
1775                return -EINVAL;
1776
1777        switch (ev->u.set_param.param) {
1778        case ISCSI_PARAM_SESS_RECOVERY_TMO:
1779                sscanf(data, "%d", &value);
1780                session->recovery_tmo = value;
1781                break;
1782        default:
1783                err = transport->set_param(conn, ev->u.set_param.param,
1784                                           data, ev->u.set_param.len);
1785        }
1786
1787        return err;
1788}
1789
1790static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1791                               struct iscsi_uevent *ev, int msg_type)
1792{
1793        struct iscsi_endpoint *ep;
1794        struct sockaddr *dst_addr;
1795        struct Scsi_Host *shost = NULL;
1796        int non_blocking, err = 0;
1797
1798        if (!transport->ep_connect)
1799                return -EINVAL;
1800
1801        if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1802                shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1803                if (!shost) {
1804                        printk(KERN_ERR "ep connect failed. Could not find "
1805                               "host no %u\n",
1806                               ev->u.ep_connect_through_host.host_no);
1807                        return -ENODEV;
1808                }
1809                non_blocking = ev->u.ep_connect_through_host.non_blocking;
1810        } else
1811                non_blocking = ev->u.ep_connect.non_blocking;
1812
1813        dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1814        ep = transport->ep_connect(shost, dst_addr, non_blocking);
1815        if (IS_ERR(ep)) {
1816                err = PTR_ERR(ep);
1817                goto release_host;
1818        }
1819
1820        ev->r.ep_connect_ret.handle = ep->id;
1821release_host:
1822        if (shost)
1823                scsi_host_put(shost);
1824        return err;
1825}
1826
1827static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1828                                  u64 ep_handle)
1829{
1830        struct iscsi_cls_conn *conn;
1831        struct iscsi_endpoint *ep;
1832
1833        if (!transport->ep_disconnect)
1834                return -EINVAL;
1835
1836        ep = iscsi_lookup_endpoint(ep_handle);
1837        if (!ep)
1838                return -EINVAL;
1839        conn = ep->conn;
1840        if (conn) {
1841                mutex_lock(&conn->ep_mutex);
1842                conn->ep = NULL;
1843                mutex_unlock(&conn->ep_mutex);
1844        }
1845
1846        transport->ep_disconnect(ep);
1847        return 0;
1848}
1849
1850static int
1851iscsi_if_transport_ep(struct iscsi_transport *transport,
1852                      struct iscsi_uevent *ev, int msg_type)
1853{
1854        struct iscsi_endpoint *ep;
1855        int rc = 0;
1856
1857        switch (msg_type) {
1858        case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1859        case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1860                rc = iscsi_if_ep_connect(transport, ev, msg_type);
1861                break;
1862        case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1863                if (!transport->ep_poll)
1864                        return -EINVAL;
1865
1866                ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1867                if (!ep)
1868                        return -EINVAL;
1869
1870                ev->r.retcode = transport->ep_poll(ep,
1871                                                   ev->u.ep_poll.timeout_ms);
1872                break;
1873        case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1874                rc = iscsi_if_ep_disconnect(transport,
1875                                            ev->u.ep_disconnect.ep_handle);
1876                break;
1877        }
1878        return rc;
1879}
1880
1881static int
1882iscsi_tgt_dscvr(struct iscsi_transport *transport,
1883                struct iscsi_uevent *ev)
1884{
1885        struct Scsi_Host *shost;
1886        struct sockaddr *dst_addr;
1887        int err;
1888
1889        if (!transport->tgt_dscvr)
1890                return -EINVAL;
1891
1892        shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1893        if (!shost) {
1894                printk(KERN_ERR "target discovery could not find host no %u\n",
1895                       ev->u.tgt_dscvr.host_no);
1896                return -ENODEV;
1897        }
1898
1899
1900        dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1901        err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1902                                   ev->u.tgt_dscvr.enable, dst_addr);
1903        scsi_host_put(shost);
1904        return err;
1905}
1906
1907static int
1908iscsi_set_host_param(struct iscsi_transport *transport,
1909                     struct iscsi_uevent *ev)
1910{
1911        char *data = (char*)ev + sizeof(*ev);
1912        struct Scsi_Host *shost;
1913        int err;
1914
1915        if (!transport->set_host_param)
1916                return -ENOSYS;
1917
1918        shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1919        if (!shost) {
1920                printk(KERN_ERR "set_host_param could not find host no %u\n",
1921                       ev->u.set_host_param.host_no);
1922                return -ENODEV;
1923        }
1924
1925        err = transport->set_host_param(shost, ev->u.set_host_param.param,
1926                                        data, ev->u.set_host_param.len);
1927        scsi_host_put(shost);
1928        return err;
1929}
1930
1931static int
1932iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1933{
1934        struct Scsi_Host *shost;
1935        struct iscsi_path *params;
1936        int err;
1937
1938        if (!transport->set_path)
1939                return -ENOSYS;
1940
1941        shost = scsi_host_lookup(ev->u.set_path.host_no);
1942        if (!shost) {
1943                printk(KERN_ERR "set path could not find host no %u\n",
1944                       ev->u.set_path.host_no);
1945                return -ENODEV;
1946        }
1947
1948        params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1949        err = transport->set_path(shost, params);
1950
1951        scsi_host_put(shost);
1952        return err;
1953}
1954
1955static int
1956iscsi_set_iface_params(struct iscsi_transport *transport,
1957                       struct iscsi_uevent *ev, uint32_t len)
1958{
1959        char *data = (char *)ev + sizeof(*ev);
1960        struct Scsi_Host *shost;
1961        int err;
1962
1963        if (!transport->set_iface_param)
1964                return -ENOSYS;
1965
1966        shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1967        if (!shost) {
1968                printk(KERN_ERR "set_iface_params could not find host no %u\n",
1969                       ev->u.set_iface_params.host_no);
1970                return -ENODEV;
1971        }
1972
1973        err = transport->set_iface_param(shost, data, len);
1974        scsi_host_put(shost);
1975        return err;
1976}
1977
1978static int
1979iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1980{
1981        struct Scsi_Host *shost;
1982        struct sockaddr *dst_addr;
1983        int err;
1984
1985        if (!transport->send_ping)
1986                return -ENOSYS;
1987
1988        shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
1989        if (!shost) {
1990                printk(KERN_ERR "iscsi_ping could not find host no %u\n",
1991                       ev->u.iscsi_ping.host_no);
1992                return -ENODEV;
1993        }
1994
1995        dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
1996        err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
1997                                   ev->u.iscsi_ping.iface_type,
1998                                   ev->u.iscsi_ping.payload_size,
1999                                   ev->u.iscsi_ping.pid,
2000                                   dst_addr);
2001        scsi_host_put(shost);
2002        return err;
2003}
2004
2005static int
2006iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2007{
2008        struct iscsi_uevent *ev = NLMSG_DATA(nlh);
2009        struct Scsi_Host *shost = NULL;
2010        struct iscsi_chap_rec *chap_rec;
2011        struct iscsi_internal *priv;
2012        struct sk_buff *skbchap;
2013        struct nlmsghdr *nlhchap;
2014        struct iscsi_uevent *evchap;
2015        uint32_t chap_buf_size;
2016        int len, err = 0;
2017        char *buf;
2018
2019        if (!transport->get_chap)
2020                return -EINVAL;
2021
2022        priv = iscsi_if_transport_lookup(transport);
2023        if (!priv)
2024                return -EINVAL;
2025
2026        chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
2027        len = NLMSG_SPACE(sizeof(*ev) + chap_buf_size);
2028
2029        shost = scsi_host_lookup(ev->u.get_chap.host_no);
2030        if (!shost) {
2031                printk(KERN_ERR "%s: failed. Cound not find host no %u\n",
2032                       __func__, ev->u.get_chap.host_no);
2033                return -ENODEV;
2034        }
2035
2036        do {
2037                int actual_size;
2038
2039                skbchap = alloc_skb(len, GFP_KERNEL);
2040                if (!skbchap) {
2041                        printk(KERN_ERR "can not deliver chap: OOM\n");
2042                        err = -ENOMEM;
2043                        goto exit_get_chap;
2044                }
2045
2046                nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
2047                                      (len - sizeof(*nlhchap)), 0);
2048                evchap = NLMSG_DATA(nlhchap);
2049                memset(evchap, 0, sizeof(*evchap));
2050                evchap->transport_handle = iscsi_handle(transport);
2051                evchap->type = nlh->nlmsg_type;
2052                evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
2053                evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
2054                evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
2055                buf = (char *) ((char *)evchap + sizeof(*evchap));
2056                memset(buf, 0, chap_buf_size);
2057
2058                err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
2059                                    &evchap->u.get_chap.num_entries, buf);
2060
2061                actual_size = NLMSG_SPACE(sizeof(*ev) + chap_buf_size);
2062                skb_trim(skbchap, NLMSG_ALIGN(actual_size));
2063                nlhchap->nlmsg_len = actual_size;
2064
2065                err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
2066                                          GFP_KERNEL);
2067        } while (err < 0 && err != -ECONNREFUSED);
2068
2069exit_get_chap:
2070        scsi_host_put(shost);
2071        return err;
2072}
2073
2074static int iscsi_delete_chap(struct iscsi_transport *transport,
2075                             struct iscsi_uevent *ev)
2076{
2077        struct Scsi_Host *shost;
2078        int err = 0;
2079
2080        if (!transport->delete_chap)
2081                return -ENOSYS;
2082
2083        shost = scsi_host_lookup(ev->u.delete_chap.host_no);
2084        if (!shost) {
2085                printk(KERN_ERR "%s could not find host no %u\n",
2086                       __func__, ev->u.delete_chap.host_no);
2087                return -ENODEV;
2088        }
2089
2090        err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
2091        scsi_host_put(shost);
2092        return err;
2093}
2094
2095static int
2096iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
2097{
2098        int err = 0;
2099        struct iscsi_uevent *ev = NLMSG_DATA(nlh);
2100        struct iscsi_transport *transport = NULL;
2101        struct iscsi_internal *priv;
2102        struct iscsi_cls_session *session;
2103        struct iscsi_cls_conn *conn;
2104        struct iscsi_endpoint *ep = NULL;
2105
2106        if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
2107                *group = ISCSI_NL_GRP_UIP;
2108        else
2109                *group = ISCSI_NL_GRP_ISCSID;
2110
2111        priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
2112        if (!priv)
2113                return -EINVAL;
2114        transport = priv->iscsi_transport;
2115
2116        if (!try_module_get(transport->owner))
2117                return -EINVAL;
2118
2119        switch (nlh->nlmsg_type) {
2120        case ISCSI_UEVENT_CREATE_SESSION:
2121                err = iscsi_if_create_session(priv, ep, ev,
2122                                              NETLINK_CB(skb).pid,
2123                                              ev->u.c_session.initial_cmdsn,
2124                                              ev->u.c_session.cmds_max,
2125                                              ev->u.c_session.queue_depth);
2126                break;
2127        case ISCSI_UEVENT_CREATE_BOUND_SESSION:
2128                ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
2129                if (!ep) {
2130                        err = -EINVAL;
2131                        break;
2132                }
2133
2134                err = iscsi_if_create_session(priv, ep, ev,
2135                                        NETLINK_CB(skb).pid,
2136                                        ev->u.c_bound_session.initial_cmdsn,
2137                                        ev->u.c_bound_session.cmds_max,
2138                                        ev->u.c_bound_session.queue_depth);
2139                break;
2140        case ISCSI_UEVENT_DESTROY_SESSION:
2141                session = iscsi_session_lookup(ev->u.d_session.sid);
2142                if (session)
2143                        transport->destroy_session(session);
2144                else
2145                        err = -EINVAL;
2146                break;
2147        case ISCSI_UEVENT_UNBIND_SESSION:
2148                session = iscsi_session_lookup(ev->u.d_session.sid);
2149                if (session)
2150                        scsi_queue_work(iscsi_session_to_shost(session),
2151                                        &session->unbind_work);
2152                else
2153                        err = -EINVAL;
2154                break;
2155        case ISCSI_UEVENT_CREATE_CONN:
2156                err = iscsi_if_create_conn(transport, ev);
2157                break;
2158        case ISCSI_UEVENT_DESTROY_CONN:
2159                err = iscsi_if_destroy_conn(transport, ev);
2160                break;
2161        case ISCSI_UEVENT_BIND_CONN:
2162                session = iscsi_session_lookup(ev->u.b_conn.sid);
2163                conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
2164
2165                if (conn && conn->ep)
2166                        iscsi_if_ep_disconnect(transport, conn->ep->id);
2167
2168                if (!session || !conn) {
2169                        err = -EINVAL;
2170                        break;
2171                }
2172
2173                ev->r.retcode = transport->bind_conn(session, conn,
2174                                                ev->u.b_conn.transport_eph,
2175                                                ev->u.b_conn.is_leading);
2176                if (ev->r.retcode || !transport->ep_connect)
2177                        break;
2178
2179                ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
2180                if (ep) {
2181                        ep->conn = conn;
2182
2183                        mutex_lock(&conn->ep_mutex);
2184                        conn->ep = ep;
2185                        mutex_unlock(&conn->ep_mutex);
2186                } else
2187                        iscsi_cls_conn_printk(KERN_ERR, conn,
2188                                              "Could not set ep conn "
2189                                              "binding\n");
2190                break;
2191        case ISCSI_UEVENT_SET_PARAM:
2192                err = iscsi_set_param(transport, ev);
2193                break;
2194        case ISCSI_UEVENT_START_CONN:
2195                conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
2196                if (conn)
2197                        ev->r.retcode = transport->start_conn(conn);
2198                else
2199                        err = -EINVAL;
2200                break;
2201        case ISCSI_UEVENT_STOP_CONN:
2202                conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2203                if (conn)
2204                        transport->stop_conn(conn, ev->u.stop_conn.flag);
2205                else
2206                        err = -EINVAL;
2207                break;
2208        case ISCSI_UEVENT_SEND_PDU:
2209                conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
2210                if (conn)
2211                        ev->r.retcode = transport->send_pdu(conn,
2212                                (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
2213                                (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
2214                                ev->u.send_pdu.data_size);
2215                else
2216                        err = -EINVAL;
2217                break;
2218        case ISCSI_UEVENT_GET_STATS:
2219                err = iscsi_if_get_stats(transport, nlh);
2220                break;
2221        case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2222        case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2223        case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2224        case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2225                err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
2226                break;
2227        case ISCSI_UEVENT_TGT_DSCVR:
2228                err = iscsi_tgt_dscvr(transport, ev);
2229                break;
2230        case ISCSI_UEVENT_SET_HOST_PARAM:
2231                err = iscsi_set_host_param(transport, ev);
2232                break;
2233        case ISCSI_UEVENT_PATH_UPDATE:
2234                err = iscsi_set_path(transport, ev);
2235                break;
2236        case ISCSI_UEVENT_SET_IFACE_PARAMS:
2237                err = iscsi_set_iface_params(transport, ev,
2238                                             nlmsg_attrlen(nlh, sizeof(*ev)));
2239                break;
2240        case ISCSI_UEVENT_PING:
2241                err = iscsi_send_ping(transport, ev);
2242                break;
2243        case ISCSI_UEVENT_GET_CHAP:
2244                err = iscsi_get_chap(transport, nlh);
2245                break;
2246        case ISCSI_UEVENT_DELETE_CHAP:
2247                err = iscsi_delete_chap(transport, ev);
2248                break;
2249        default:
2250                err = -ENOSYS;
2251                break;
2252        }
2253
2254        module_put(transport->owner);
2255        return err;
2256}
2257
2258/*
2259 * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
2260 * Malformed skbs with wrong lengths or invalid creds are not processed.
2261 */
2262static void
2263iscsi_if_rx(struct sk_buff *skb)
2264{
2265        mutex_lock(&rx_queue_mutex);
2266        while (skb->len >= NLMSG_SPACE(0)) {
2267                int err;
2268                uint32_t rlen;
2269                struct nlmsghdr *nlh;
2270                struct iscsi_uevent *ev;
2271                uint32_t group;
2272
2273                nlh = nlmsg_hdr(skb);
2274                if (nlh->nlmsg_len < sizeof(*nlh) ||
2275                    skb->len < nlh->nlmsg_len) {
2276                        break;
2277                }
2278
2279                ev = NLMSG_DATA(nlh);
2280                rlen = NLMSG_ALIGN(nlh->nlmsg_len);
2281                if (rlen > skb->len)
2282                        rlen = skb->len;
2283
2284                err = iscsi_if_recv_msg(skb, nlh, &group);
2285                if (err) {
2286                        ev->type = ISCSI_KEVENT_IF_ERROR;
2287                        ev->iferror = err;
2288                }
2289                do {
2290                        /*
2291                         * special case for GET_STATS:
2292                         * on success - sending reply and stats from
2293                         * inside of if_recv_msg(),
2294                         * on error - fall through.
2295                         */
2296                        if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
2297                                break;
2298                        if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
2299                                break;
2300                        err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
2301                                nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
2302                } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
2303                skb_pull(skb, rlen);
2304        }
2305        mutex_unlock(&rx_queue_mutex);
2306}
2307
2308#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
2309struct device_attribute dev_attr_##_prefix##_##_name =  \
2310        __ATTR(_name,_mode,_show,_store)
2311
2312/*
2313 * iSCSI connection attrs
2314 */
2315#define iscsi_conn_attr_show(param)                                     \
2316static ssize_t                                                          \
2317show_conn_param_##param(struct device *dev,                             \
2318                        struct device_attribute *attr, char *buf)       \
2319{                                                                       \
2320        struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2321        struct iscsi_transport *t = conn->transport;                    \
2322        return t->get_conn_param(conn, param, buf);                     \
2323}
2324
2325#define iscsi_conn_attr(field, param)                                   \
2326        iscsi_conn_attr_show(param)                                     \
2327static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
2328                        NULL);
2329
2330iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
2331iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
2332iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
2333iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
2334iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
2335iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
2336iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
2337iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
2338iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
2339iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
2340iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
2341
2342#define iscsi_conn_ep_attr_show(param)                                  \
2343static ssize_t show_conn_ep_param_##param(struct device *dev,           \
2344                                          struct device_attribute *attr,\
2345                                          char *buf)                    \
2346{                                                                       \
2347        struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
2348        struct iscsi_transport *t = conn->transport;                    \
2349        struct iscsi_endpoint *ep;                                      \
2350        ssize_t rc;                                                     \
2351                                                                        \
2352        /*                                                              \
2353         * Need to make sure ep_disconnect does not free the LLD's      \
2354         * interconnect resources while we are trying to read them.     \
2355         */                                                             \
2356        mutex_lock(&conn->ep_mutex);                                    \
2357        ep = conn->ep;                                                  \
2358        if (!ep && t->ep_connect) {                                     \
2359                mutex_unlock(&conn->ep_mutex);                          \
2360                return -ENOTCONN;                                       \
2361        }                                                               \
2362                                                                        \
2363        if (ep)                                                         \
2364                rc = t->get_ep_param(ep, param, buf);                   \
2365        else                                                            \
2366                rc = t->get_conn_param(conn, param, buf);               \
2367        mutex_unlock(&conn->ep_mutex);                                  \
2368        return rc;                                                      \
2369}
2370
2371#define iscsi_conn_ep_attr(field, param)                                \
2372        iscsi_conn_ep_attr_show(param)                                  \
2373static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2374                        show_conn_ep_param_##param, NULL);
2375
2376iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2377iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2378
2379static struct attribute *iscsi_conn_attrs[] = {
2380        &dev_attr_conn_max_recv_dlength.attr,
2381        &dev_attr_conn_max_xmit_dlength.attr,
2382        &dev_attr_conn_header_digest.attr,
2383        &dev_attr_conn_data_digest.attr,
2384        &dev_attr_conn_ifmarker.attr,
2385        &dev_attr_conn_ofmarker.attr,
2386        &dev_attr_conn_address.attr,
2387        &dev_attr_conn_port.attr,
2388        &dev_attr_conn_exp_statsn.attr,
2389        &dev_attr_conn_persistent_address.attr,
2390        &dev_attr_conn_persistent_port.attr,
2391        &dev_attr_conn_ping_tmo.attr,
2392        &dev_attr_conn_recv_tmo.attr,
2393        NULL,
2394};
2395
2396static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2397                                         struct attribute *attr, int i)
2398{
2399        struct device *cdev = container_of(kobj, struct device, kobj);
2400        struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2401        struct iscsi_transport *t = conn->transport;
2402        int param;
2403
2404        if (attr == &dev_attr_conn_max_recv_dlength.attr)
2405                param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2406        else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2407                param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2408        else if (attr == &dev_attr_conn_header_digest.attr)
2409                param = ISCSI_PARAM_HDRDGST_EN;
2410        else if (attr == &dev_attr_conn_data_digest.attr)
2411                param = ISCSI_PARAM_DATADGST_EN;
2412        else if (attr == &dev_attr_conn_ifmarker.attr)
2413                param = ISCSI_PARAM_IFMARKER_EN;
2414        else if (attr == &dev_attr_conn_ofmarker.attr)
2415                param = ISCSI_PARAM_OFMARKER_EN;
2416        else if (attr == &dev_attr_conn_address.attr)
2417                param = ISCSI_PARAM_CONN_ADDRESS;
2418        else if (attr == &dev_attr_conn_port.attr)
2419                param = ISCSI_PARAM_CONN_PORT;
2420        else if (attr == &dev_attr_conn_exp_statsn.attr)
2421                param = ISCSI_PARAM_EXP_STATSN;
2422        else if (attr == &dev_attr_conn_persistent_address.attr)
2423                param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2424        else if (attr == &dev_attr_conn_persistent_port.attr)
2425                param = ISCSI_PARAM_PERSISTENT_PORT;
2426        else if (attr == &dev_attr_conn_ping_tmo.attr)
2427                param = ISCSI_PARAM_PING_TMO;
2428        else if (attr == &dev_attr_conn_recv_tmo.attr)
2429                param = ISCSI_PARAM_RECV_TMO;
2430        else {
2431                WARN_ONCE(1, "Invalid conn attr");
2432                return 0;
2433        }
2434
2435        return t->attr_is_visible(ISCSI_PARAM, param);
2436}
2437
2438static struct attribute_group iscsi_conn_group = {
2439        .attrs = iscsi_conn_attrs,
2440        .is_visible = iscsi_conn_attr_is_visible,
2441};
2442
2443/*
2444 * iSCSI session attrs
2445 */
2446#define iscsi_session_attr_show(param, perm)                            \
2447static ssize_t                                                          \
2448show_session_param_##param(struct device *dev,                          \
2449                           struct device_attribute *attr, char *buf)    \
2450{                                                                       \
2451        struct iscsi_cls_session *session =                             \
2452                iscsi_dev_to_session(dev->parent);                      \
2453        struct iscsi_transport *t = session->transport;                 \
2454                                                                        \
2455        if (perm && !capable(CAP_SYS_ADMIN))                            \
2456                return -EACCES;                                         \
2457        return t->get_session_param(session, param, buf);               \
2458}
2459
2460#define iscsi_session_attr(field, param, perm)                          \
2461        iscsi_session_attr_show(param, perm)                            \
2462static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2463                        NULL);
2464iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2465iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2466iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2467iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2468iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2469iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2470iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2471iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2472iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2473iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2474iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2475iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2476iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2477iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2478iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
2479iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
2480iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2481iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2482iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2483iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2484iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2485iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2486iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2487
2488static ssize_t
2489show_priv_session_state(struct device *dev, struct device_attribute *attr,
2490                        char *buf)
2491{
2492        struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2493        return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2494}
2495static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2496                        NULL);
2497static ssize_t
2498show_priv_session_creator(struct device *dev, struct device_attribute *attr,
2499                        char *buf)
2500{
2501        struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2502        return sprintf(buf, "%d\n", session->creator);
2503}
2504static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
2505                        NULL);
2506
2507#define iscsi_priv_session_attr_show(field, format)                     \
2508static ssize_t                                                          \
2509show_priv_session_##field(struct device *dev,                           \
2510                          struct device_attribute *attr, char *buf)     \
2511{                                                                       \
2512        struct iscsi_cls_session *session =                             \
2513                        iscsi_dev_to_session(dev->parent);              \
2514        if (session->field == -1)                                       \
2515                return sprintf(buf, "off\n");                           \
2516        return sprintf(buf, format"\n", session->field);                \
2517}
2518
2519#define iscsi_priv_session_attr_store(field)                            \
2520static ssize_t                                                          \
2521store_priv_session_##field(struct device *dev,                          \
2522                           struct device_attribute *attr,               \
2523                           const char *buf, size_t count)               \
2524{                                                                       \
2525        int val;                                                        \
2526        char *cp;                                                       \
2527        struct iscsi_cls_session *session =                             \
2528                iscsi_dev_to_session(dev->parent);                      \
2529        if ((session->state == ISCSI_SESSION_FREE) ||                   \
2530            (session->state == ISCSI_SESSION_FAILED))                   \
2531                return -EBUSY;                                          \
2532        if (strncmp(buf, "off", 3) == 0)                                \
2533                session->field = -1;                                    \
2534        else {                                                          \
2535                val = simple_strtoul(buf, &cp, 0);                      \
2536                if (*cp != '\0' && *cp != '\n')                         \
2537                        return -EINVAL;                                 \
2538                session->field = val;                                   \
2539        }                                                               \
2540        return count;                                                   \
2541}
2542
2543#define iscsi_priv_session_rw_attr(field, format)                       \
2544        iscsi_priv_session_attr_show(field, format)                     \
2545        iscsi_priv_session_attr_store(field)                            \
2546static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2547                        show_priv_session_##field,                      \
2548                        store_priv_session_##field)
2549iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2550
2551static struct attribute *iscsi_session_attrs[] = {
2552        &dev_attr_sess_initial_r2t.attr,
2553        &dev_attr_sess_max_outstanding_r2t.attr,
2554        &dev_attr_sess_immediate_data.attr,
2555        &dev_attr_sess_first_burst_len.attr,
2556        &dev_attr_sess_max_burst_len.attr,
2557        &dev_attr_sess_data_pdu_in_order.attr,
2558        &dev_attr_sess_data_seq_in_order.attr,
2559        &dev_attr_sess_erl.attr,
2560        &dev_attr_sess_targetname.attr,
2561        &dev_attr_sess_tpgt.attr,
2562        &dev_attr_sess_password.attr,
2563        &dev_attr_sess_password_in.attr,
2564        &dev_attr_sess_username.attr,
2565        &dev_attr_sess_username_in.attr,
2566        &dev_attr_sess_fast_abort.attr,
2567        &dev_attr_sess_abort_tmo.attr,
2568        &dev_attr_sess_lu_reset_tmo.attr,
2569        &dev_attr_sess_tgt_reset_tmo.attr,
2570        &dev_attr_sess_ifacename.attr,
2571        &dev_attr_sess_initiatorname.attr,
2572        &dev_attr_sess_targetalias.attr,
2573        &dev_attr_priv_sess_recovery_tmo.attr,
2574        &dev_attr_priv_sess_state.attr,
2575        &dev_attr_priv_sess_creator.attr,
2576        &dev_attr_sess_chap_out_idx.attr,
2577        &dev_attr_sess_chap_in_idx.attr,
2578        NULL,
2579};
2580
2581static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2582                                            struct attribute *attr, int i)
2583{
2584        struct device *cdev = container_of(kobj, struct device, kobj);
2585        struct iscsi_cls_session *session = transport_class_to_session(cdev);
2586        struct iscsi_transport *t = session->transport;
2587        int param;
2588
2589        if (attr == &dev_attr_sess_initial_r2t.attr)
2590                param = ISCSI_PARAM_INITIAL_R2T_EN;
2591        else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2592                param = ISCSI_PARAM_MAX_R2T;
2593        else if (attr == &dev_attr_sess_immediate_data.attr)
2594                param = ISCSI_PARAM_IMM_DATA_EN;
2595        else if (attr == &dev_attr_sess_first_burst_len.attr)
2596                param = ISCSI_PARAM_FIRST_BURST;
2597        else if (attr == &dev_attr_sess_max_burst_len.attr)
2598                param = ISCSI_PARAM_MAX_BURST;
2599        else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2600                param = ISCSI_PARAM_PDU_INORDER_EN;
2601        else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2602                param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2603        else if (attr == &dev_attr_sess_erl.attr)
2604                param = ISCSI_PARAM_ERL;
2605        else if (attr == &dev_attr_sess_targetname.attr)
2606                param = ISCSI_PARAM_TARGET_NAME;
2607        else if (attr == &dev_attr_sess_tpgt.attr)
2608                param = ISCSI_PARAM_TPGT;
2609        else if (attr == &dev_attr_sess_chap_in_idx.attr)
2610                param = ISCSI_PARAM_CHAP_IN_IDX;
2611        else if (attr == &dev_attr_sess_chap_out_idx.attr)
2612                param = ISCSI_PARAM_CHAP_OUT_IDX;
2613        else if (attr == &dev_attr_sess_password.attr)
2614                param = ISCSI_PARAM_USERNAME;
2615        else if (attr == &dev_attr_sess_password_in.attr)
2616                param = ISCSI_PARAM_USERNAME_IN;
2617        else if (attr == &dev_attr_sess_username.attr)
2618                param = ISCSI_PARAM_PASSWORD;
2619        else if (attr == &dev_attr_sess_username_in.attr)
2620                param = ISCSI_PARAM_PASSWORD_IN;
2621        else if (attr == &dev_attr_sess_fast_abort.attr)
2622                param = ISCSI_PARAM_FAST_ABORT;
2623        else if (attr == &dev_attr_sess_abort_tmo.attr)
2624                param = ISCSI_PARAM_ABORT_TMO;
2625        else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2626                param = ISCSI_PARAM_LU_RESET_TMO;
2627        else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2628                param = ISCSI_PARAM_TGT_RESET_TMO;
2629        else if (attr == &dev_attr_sess_ifacename.attr)
2630                param = ISCSI_PARAM_IFACE_NAME;
2631        else if (attr == &dev_attr_sess_initiatorname.attr)
2632                param = ISCSI_PARAM_INITIATOR_NAME;
2633        else if (attr == &dev_attr_sess_targetalias.attr)
2634                param = ISCSI_PARAM_TARGET_ALIAS;
2635        else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2636                return S_IRUGO | S_IWUSR;
2637        else if (attr == &dev_attr_priv_sess_state.attr)
2638                return S_IRUGO;
2639        else if (attr == &dev_attr_priv_sess_creator.attr)
2640                return S_IRUGO;
2641        else {
2642                WARN_ONCE(1, "Invalid session attr");
2643                return 0;
2644        }
2645
2646        return t->attr_is_visible(ISCSI_PARAM, param);
2647}
2648
2649static struct attribute_group iscsi_session_group = {
2650        .attrs = iscsi_session_attrs,
2651        .is_visible = iscsi_session_attr_is_visible,
2652};
2653
2654/*
2655 * iSCSI host attrs
2656 */
2657#define iscsi_host_attr_show(param)                                     \
2658static ssize_t                                                          \
2659show_host_param_##param(struct device *dev,                             \
2660                        struct device_attribute *attr, char *buf)       \
2661{                                                                       \
2662        struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2663        struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2664        return priv->iscsi_transport->get_host_param(shost, param, buf); \
2665}
2666
2667#define iscsi_host_attr(field, param)                                   \
2668        iscsi_host_attr_show(param)                                     \
2669static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2670                        NULL);
2671
2672iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2673iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2674iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2675iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2676iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
2677iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
2678
2679static struct attribute *iscsi_host_attrs[] = {
2680        &dev_attr_host_netdev.attr,
2681        &dev_attr_host_hwaddress.attr,
2682        &dev_attr_host_ipaddress.attr,
2683        &dev_attr_host_initiatorname.attr,
2684        &dev_attr_host_port_state.attr,
2685        &dev_attr_host_port_speed.attr,
2686        NULL,
2687};
2688
2689static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2690                                         struct attribute *attr, int i)
2691{
2692        struct device *cdev = container_of(kobj, struct device, kobj);
2693        struct Scsi_Host *shost = transport_class_to_shost(cdev);
2694        struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2695        int param;
2696
2697        if (attr == &dev_attr_host_netdev.attr)
2698                param = ISCSI_HOST_PARAM_NETDEV_NAME;
2699        else if (attr == &dev_attr_host_hwaddress.attr)
2700                param = ISCSI_HOST_PARAM_HWADDRESS;
2701        else if (attr == &dev_attr_host_ipaddress.attr)
2702                param = ISCSI_HOST_PARAM_IPADDRESS;
2703        else if (attr == &dev_attr_host_initiatorname.attr)
2704                param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2705        else if (attr == &dev_attr_host_port_state.attr)
2706                param = ISCSI_HOST_PARAM_PORT_STATE;
2707        else if (attr == &dev_attr_host_port_speed.attr)
2708                param = ISCSI_HOST_PARAM_PORT_SPEED;
2709        else {
2710                WARN_ONCE(1, "Invalid host attr");
2711                return 0;
2712        }
2713
2714        return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2715}
2716
2717static struct attribute_group iscsi_host_group = {
2718        .attrs = iscsi_host_attrs,
2719        .is_visible = iscsi_host_attr_is_visible,
2720};
2721
2722/* convert iscsi_port_speed values to ascii string name */
2723static const struct {
2724        enum iscsi_port_speed   value;
2725        char                    *name;
2726} iscsi_port_speed_names[] = {
2727        {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
2728        {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
2729        {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
2730        {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
2731        {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
2732};
2733
2734char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
2735{
2736        int i;
2737        char *speed = "Unknown!";
2738        struct iscsi_cls_host *ihost = shost->shost_data;
2739        uint32_t port_speed = ihost->port_speed;
2740
2741        for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
2742                if (iscsi_port_speed_names[i].value & port_speed) {
2743                        speed = iscsi_port_speed_names[i].name;
2744                        break;
2745                }
2746        }
2747        return speed;
2748}
2749EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
2750
2751/* convert iscsi_port_state values to ascii string name */
2752static const struct {
2753        enum iscsi_port_state   value;
2754        char                    *name;
2755} iscsi_port_state_names[] = {
2756        {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
2757        {ISCSI_PORT_STATE_UP,           "LINK UP" },
2758};
2759
2760char *iscsi_get_port_state_name(struct Scsi_Host *shost)
2761{
2762        int i;
2763        char *state = "Unknown!";
2764        struct iscsi_cls_host *ihost = shost->shost_data;
2765        uint32_t port_state = ihost->port_state;
2766
2767        for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
2768                if (iscsi_port_state_names[i].value & port_state) {
2769                        state = iscsi_port_state_names[i].name;
2770                        break;
2771                }
2772        }
2773        return state;
2774}
2775EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
2776
2777static int iscsi_session_match(struct attribute_container *cont,
2778                           struct device *dev)
2779{
2780        struct iscsi_cls_session *session;
2781        struct Scsi_Host *shost;
2782        struct iscsi_internal *priv;
2783
2784        if (!iscsi_is_session_dev(dev))
2785                return 0;
2786
2787        session = iscsi_dev_to_session(dev);
2788        shost = iscsi_session_to_shost(session);
2789        if (!shost->transportt)
2790                return 0;
2791
2792        priv = to_iscsi_internal(shost->transportt);
2793        if (priv->session_cont.ac.class != &iscsi_session_class.class)
2794                return 0;
2795
2796        return &priv->session_cont.ac == cont;
2797}
2798
2799static int iscsi_conn_match(struct attribute_container *cont,
2800                           struct device *dev)
2801{
2802        struct iscsi_cls_session *session;
2803        struct iscsi_cls_conn *conn;
2804        struct Scsi_Host *shost;
2805        struct iscsi_internal *priv;
2806
2807        if (!iscsi_is_conn_dev(dev))
2808                return 0;
2809
2810        conn = iscsi_dev_to_conn(dev);
2811        session = iscsi_dev_to_session(conn->dev.parent);
2812        shost = iscsi_session_to_shost(session);
2813
2814        if (!shost->transportt)
2815                return 0;
2816
2817        priv = to_iscsi_internal(shost->transportt);
2818        if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2819                return 0;
2820
2821        return &priv->conn_cont.ac == cont;
2822}
2823
2824static int iscsi_host_match(struct attribute_container *cont,
2825                            struct device *dev)
2826{
2827        struct Scsi_Host *shost;
2828        struct iscsi_internal *priv;
2829
2830        if (!scsi_is_host_device(dev))
2831                return 0;
2832
2833        shost = dev_to_shost(dev);
2834        if (!shost->transportt  ||
2835            shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2836                return 0;
2837
2838        priv = to_iscsi_internal(shost->transportt);
2839        return &priv->t.host_attrs.ac == cont;
2840}
2841
2842struct scsi_transport_template *
2843iscsi_register_transport(struct iscsi_transport *tt)
2844{
2845        struct iscsi_internal *priv;
2846        unsigned long flags;
2847        int err;
2848
2849        BUG_ON(!tt);
2850
2851        priv = iscsi_if_transport_lookup(tt);
2852        if (priv)
2853                return NULL;
2854
2855        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2856        if (!priv)
2857                return NULL;
2858        INIT_LIST_HEAD(&priv->list);
2859        priv->iscsi_transport = tt;
2860        priv->t.user_scan = iscsi_user_scan;
2861        priv->t.create_work_queue = 1;
2862
2863        priv->dev.class = &iscsi_transport_class;
2864        dev_set_name(&priv->dev, "%s", tt->name);
2865        err = device_register(&priv->dev);
2866        if (err)
2867                goto free_priv;
2868
2869        err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2870        if (err)
2871                goto unregister_dev;
2872
2873        /* host parameters */
2874        priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2875        priv->t.host_attrs.ac.match = iscsi_host_match;
2876        priv->t.host_attrs.ac.grp = &iscsi_host_group;
2877        priv->t.host_size = sizeof(struct iscsi_cls_host);
2878        transport_container_register(&priv->t.host_attrs);
2879
2880        /* connection parameters */
2881        priv->conn_cont.ac.class = &iscsi_connection_class.class;
2882        priv->conn_cont.ac.match = iscsi_conn_match;
2883        priv->conn_cont.ac.grp = &iscsi_conn_group;
2884        transport_container_register(&priv->conn_cont);
2885
2886        /* session parameters */
2887        priv->session_cont.ac.class = &iscsi_session_class.class;
2888        priv->session_cont.ac.match = iscsi_session_match;
2889        priv->session_cont.ac.grp = &iscsi_session_group;
2890        transport_container_register(&priv->session_cont);
2891
2892        spin_lock_irqsave(&iscsi_transport_lock, flags);
2893        list_add(&priv->list, &iscsi_transports);
2894        spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2895
2896        printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2897        return &priv->t;
2898
2899unregister_dev:
2900        device_unregister(&priv->dev);
2901        return NULL;
2902free_priv:
2903        kfree(priv);
2904        return NULL;
2905}
2906EXPORT_SYMBOL_GPL(iscsi_register_transport);
2907
2908int iscsi_unregister_transport(struct iscsi_transport *tt)
2909{
2910        struct iscsi_internal *priv;
2911        unsigned long flags;
2912
2913        BUG_ON(!tt);
2914
2915        mutex_lock(&rx_queue_mutex);
2916
2917        priv = iscsi_if_transport_lookup(tt);
2918        BUG_ON (!priv);
2919
2920        spin_lock_irqsave(&iscsi_transport_lock, flags);
2921        list_del(&priv->list);
2922        spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2923
2924        transport_container_unregister(&priv->conn_cont);
2925        transport_container_unregister(&priv->session_cont);
2926        transport_container_unregister(&priv->t.host_attrs);
2927
2928        sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2929        device_unregister(&priv->dev);
2930        mutex_unlock(&rx_queue_mutex);
2931
2932        return 0;
2933}
2934EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2935
2936static __init int iscsi_transport_init(void)
2937{
2938        int err;
2939        struct netlink_kernel_cfg cfg = {
2940                .groups = 1,
2941                .input  = iscsi_if_rx,
2942        };
2943        printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2944                ISCSI_TRANSPORT_VERSION);
2945
2946        atomic_set(&iscsi_session_nr, 0);
2947
2948        err = class_register(&iscsi_transport_class);
2949        if (err)
2950                return err;
2951
2952        err = class_register(&iscsi_endpoint_class);
2953        if (err)
2954                goto unregister_transport_class;
2955
2956        err = class_register(&iscsi_iface_class);
2957        if (err)
2958                goto unregister_endpoint_class;
2959
2960        err = transport_class_register(&iscsi_host_class);
2961        if (err)
2962                goto unregister_iface_class;
2963
2964        err = transport_class_register(&iscsi_connection_class);
2965        if (err)
2966                goto unregister_host_class;
2967
2968        err = transport_class_register(&iscsi_session_class);
2969        if (err)
2970                goto unregister_conn_class;
2971
2972        nls = netlink_kernel_create(&init_net, NETLINK_ISCSI,
2973                                    THIS_MODULE, &cfg);
2974        if (!nls) {
2975                err = -ENOBUFS;
2976                goto unregister_session_class;
2977        }
2978
2979        iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2980        if (!iscsi_eh_timer_workq)
2981                goto release_nls;
2982
2983        return 0;
2984
2985release_nls:
2986        netlink_kernel_release(nls);
2987unregister_session_class:
2988        transport_class_unregister(&iscsi_session_class);
2989unregister_conn_class:
2990        transport_class_unregister(&iscsi_connection_class);
2991unregister_host_class:
2992        transport_class_unregister(&iscsi_host_class);
2993unregister_iface_class:
2994        class_unregister(&iscsi_iface_class);
2995unregister_endpoint_class:
2996        class_unregister(&iscsi_endpoint_class);
2997unregister_transport_class:
2998        class_unregister(&iscsi_transport_class);
2999        return err;
3000}
3001
3002static void __exit iscsi_transport_exit(void)
3003{
3004        destroy_workqueue(iscsi_eh_timer_workq);
3005        netlink_kernel_release(nls);
3006        transport_class_unregister(&iscsi_connection_class);
3007        transport_class_unregister(&iscsi_session_class);
3008        transport_class_unregister(&iscsi_host_class);
3009        class_unregister(&iscsi_endpoint_class);
3010        class_unregister(&iscsi_iface_class);
3011        class_unregister(&iscsi_transport_class);
3012}
3013
3014module_init(iscsi_transport_init);
3015module_exit(iscsi_transport_exit);
3016
3017MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
3018              "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
3019              "Alex Aizman <itn780@yahoo.com>");
3020MODULE_DESCRIPTION("iSCSI Transport Interface");
3021MODULE_LICENSE("GPL");
3022MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
3023MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
3024
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