drivers/infiniband/ulp/iser/iscsi_iser.c

   1 /*
   2  * iSCSI Initiator over iSER Data-Path
   3  *
   4  * Copyright (C) 2004 Dmitry Yusupov
   5  * Copyright (C) 2004 Alex Aizman
   6  * Copyright (C) 2005 Mike Christie
   7  * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
   8  * maintained by openib-general@openib.org
   9  *
  10  * This software is available to you under a choice of one of two
  11  * licenses.  You may choose to be licensed under the terms of the GNU
  12  * General Public License (GPL) Version 2, available from the file
  13  * COPYING in the main directory of this source tree, or the
  14  * OpenIB.org BSD license below:
  15  *
  16  *     Redistribution and use in source and binary forms, with or
  17  *     without modification, are permitted provided that the following
  18  *     conditions are met:
  19  *
  20  *      - Redistributions of source code must retain the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer.
  23  *
  24  *      - Redistributions in binary form must reproduce the above
  25  *        copyright notice, this list of conditions and the following
  26  *        disclaimer in the documentation and/or other materials
  27  *        provided with the distribution.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  33  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  34  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  35  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  36  * SOFTWARE.
  37  *
  38  * Credits:
  39  *      Christoph Hellwig
  40  *      FUJITA Tomonori
  41  *      Arne Redlich
  42  *      Zhenyu Wang
  43  * Modified by:
  44  *      Erez Zilber
  45  *
  46  *
  47  * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $
  48  */
  49
  50 #include <linux/types.h>
  51 #include <linux/list.h>
  52 #include <linux/hardirq.h>
  53 #include <linux/kfifo.h>
  54 #include <linux/blkdev.h>
  55 #include <linux/init.h>
  56 #include <linux/ioctl.h>
  57 #include <linux/cdev.h>
  58 #include <linux/in.h>
  59 #include <linux/net.h>
  60 #include <linux/scatterlist.h>
  61 #include <linux/delay.h>
  62
  63 #include <net/sock.h>
  64
  65 #include <asm/uaccess.h>
  66
  67 #include <scsi/scsi_cmnd.h>
  68 #include <scsi/scsi_device.h>
  69 #include <scsi/scsi_eh.h>
  70 #include <scsi/scsi_tcq.h>
  71 #include <scsi/scsi_host.h>
  72 #include <scsi/scsi.h>
  73 #include <scsi/scsi_transport_iscsi.h>
  74
  75 #include "iscsi_iser.h"
  76
  77 static unsigned int iscsi_max_lun = 512;
  78 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
  79
  80 int iser_debug_level = 0;
  81
  82 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
  83                    "v" DRV_VER " (" DRV_DATE ")");
  84 MODULE_LICENSE("Dual BSD/GPL");
  85 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
  86
  87 module_param_named(debug_level, iser_debug_level, int, 0644);
  88 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
  89
  90 struct iser_global ig;
  91
  92 void
  93 iscsi_iser_recv(struct iscsi_conn *conn,
  94                 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
  95 {
  96         int rc = 0;
  97         uint32_t ret_itt;
  98         int datalen;
  99         int ahslen;
 100
 101         /* verify PDU length */
 102         datalen = ntoh24(hdr->dlength);
 103         if (datalen != rx_data_len) {
 104                 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
 105                        datalen, rx_data_len);
 106                 rc = ISCSI_ERR_DATALEN;
 107                 goto error;
 108         }
 109
 110         /* read AHS */
 111         ahslen = hdr->hlength * 4;
 112
 113         /* verify itt (itt encoding: age+cid+itt) */
 114         rc = iscsi_verify_itt(conn, hdr, &ret_itt);
 115
 116         if (!rc)
 117                 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
 118
 119         if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
 120                 goto error;
 121
 122         return;
 123 error:
 124         iscsi_conn_failure(conn, rc);
 125 }
 126
 127
 128 /**
 129  * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
 130  *
 131  **/
 132 static int
 133 iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
 134 {
 135         struct iscsi_iser_conn     *iser_conn  = ctask->conn->dd_data;
 136         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 137
 138         iser_ctask->command_sent = 0;
 139         iser_ctask->iser_conn    = iser_conn;
 140         iser_ctask_rdma_init(iser_ctask);
 141         return 0;
 142 }
 143
 144 /**
 145  * iscsi_mtask_xmit - xmit management(immediate) task
 146  * @conn: iscsi connection
 147  * @mtask: task management task
 148  *
 149  * Notes:
 150  *      The function can return -EAGAIN in which case caller must
 151  *      call it again later, or recover. '0' return code means successful
 152  *      xmit.
 153  *
 154  **/
 155 static int
 156 iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
 157                       struct iscsi_mgmt_task *mtask)
 158 {
 159         int error = 0;
 160
 161         debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
 162
 163         error = iser_send_control(conn, mtask);
 164
 165         /* since iser xmits control with zero copy, mtasks can not be recycled
 166          * right after sending them.
 167          * The recycling scheme is based on whether a response is expected
 168          * - if yes, the mtask is recycled at iscsi_complete_pdu
 169          * - if no,  the mtask is recycled at iser_snd_completion
 170          */
 171         if (error && error != -ENOBUFS)
 172                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 173
 174         return error;
 175 }
 176
 177 static int
 178 iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
 179                                  struct iscsi_cmd_task *ctask)
 180 {
 181         struct iscsi_data  hdr;
 182         int error = 0;
 183
 184         /* Send data-out PDUs while there's still unsolicited data to send */
 185         while (ctask->unsol_count > 0) {
 186                 iscsi_prep_unsolicit_data_pdu(ctask, &hdr);
 187                 debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
 188                            hdr.itt, ctask->data_count);
 189
 190                 /* the buffer description has been passed with the command */
 191                 /* Send the command */
 192                 error = iser_send_data_out(conn, ctask, &hdr);
 193                 if (error) {
 194                         ctask->unsol_datasn--;
 195                         goto iscsi_iser_ctask_xmit_unsol_data_exit;
 196                 }
 197                 ctask->unsol_count -= ctask->data_count;
 198                 debug_scsi("Need to send %d more as data-out PDUs\n",
 199                            ctask->unsol_count);
 200         }
 201
 202 iscsi_iser_ctask_xmit_unsol_data_exit:
 203         return error;
 204 }
 205
 206 static int
 207 iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
 208                       struct iscsi_cmd_task *ctask)
 209 {
 210         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 211         int error = 0;
 212
 213         if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) {
 214                 BUG_ON(scsi_bufflen(ctask->sc) == 0);
 215
 216                 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
 217                            ctask->itt, scsi_bufflen(ctask->sc),
 218                            ctask->imm_count, ctask->unsol_count);
 219         }
 220
 221         debug_scsi("ctask deq [cid %d itt 0x%x]\n",
 222                    conn->id, ctask->itt);
 223
 224         /* Send the cmd PDU */
 225         if (!iser_ctask->command_sent) {
 226                 error = iser_send_command(conn, ctask);
 227                 if (error)
 228                         goto iscsi_iser_ctask_xmit_exit;
 229                 iser_ctask->command_sent = 1;
 230         }
 231
 232         /* Send unsolicited data-out PDU(s) if necessary */
 233         if (ctask->unsol_count)
 234                 error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
 235
 236  iscsi_iser_ctask_xmit_exit:
 237         if (error && error != -ENOBUFS)
 238                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 239         return error;
 240 }
 241
 242 static void
 243 iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
 244 {
 245         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 246
 247         if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
 248                 iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
 249                 iser_ctask_rdma_finalize(iser_ctask);
 250         }
 251 }
 252
 253 static struct iser_conn *
 254 iscsi_iser_ib_conn_lookup(__u64 ep_handle)
 255 {
 256         struct iser_conn *ib_conn;
 257         struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
 258
 259         mutex_lock(&ig.connlist_mutex);
 260         list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
 261                 if (ib_conn == uib_conn) {
 262                         mutex_unlock(&ig.connlist_mutex);
 263                         return ib_conn;
 264                 }
 265         }
 266         mutex_unlock(&ig.connlist_mutex);
 267         iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
 268         return NULL;
 269 }
 270
 271 static struct iscsi_cls_conn *
 272 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 273 {
 274         struct iscsi_conn *conn;
 275         struct iscsi_cls_conn *cls_conn;
 276         struct iscsi_iser_conn *iser_conn;
 277
 278         cls_conn = iscsi_conn_setup(cls_session, conn_idx);
 279         if (!cls_conn)
 280                 return NULL;
 281         conn = cls_conn->dd_data;
 282
 283         /*
 284          * due to issues with the login code re iser sematics
 285          * this not set in iscsi_conn_setup - FIXME
 286          */
 287         conn->max_recv_dlength = 128;
 288
 289         iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
 290         if (!iser_conn)
 291                 goto conn_alloc_fail;
 292
 293         /* currently this is the only field which need to be initiated */
 294         rwlock_init(&iser_conn->lock);
 295
 296         conn->dd_data = iser_conn;
 297         iser_conn->iscsi_conn = conn;
 298
 299         return cls_conn;
 300
 301 conn_alloc_fail:
 302         iscsi_conn_teardown(cls_conn);
 303         return NULL;
 304 }
 305
 306 static void
 307 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 308 {
 309         struct iscsi_conn *conn = cls_conn->dd_data;
 310         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 311
 312         iscsi_conn_teardown(cls_conn);
 313         if (iser_conn->ib_conn)
 314                 iser_conn->ib_conn->iser_conn = NULL;
 315         kfree(iser_conn);
 316 }
 317
 318 static int
 319 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 320                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 321                      int is_leading)
 322 {
 323         struct iscsi_conn *conn = cls_conn->dd_data;
 324         struct iscsi_iser_conn *iser_conn;
 325         struct iser_conn *ib_conn;
 326         int error;
 327
 328         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 329         if (error)
 330                 return error;
 331
 332         /* the transport ep handle comes from user space so it must be
 333          * verified against the global ib connections list */
 334         ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
 335         if (!ib_conn) {
 336                 iser_err("can't bind eph %llx\n",
 337                          (unsigned long long)transport_eph);
 338                 return -EINVAL;
 339         }
 340         /* binds the iSER connection retrieved from the previously
 341          * connected ep_handle to the iSCSI layer connection. exchanges
 342          * connection pointers */
 343         iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
 344         iser_conn = conn->dd_data;
 345         ib_conn->iser_conn = iser_conn;
 346         iser_conn->ib_conn  = ib_conn;
 347
 348         conn->recv_lock = &iser_conn->lock;
 349
 350         return 0;
 351 }
 352
 353 static int
 354 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 355 {
 356         struct iscsi_conn *conn = cls_conn->dd_data;
 357         int err;
 358
 359         err = iser_conn_set_full_featured_mode(conn);
 360         if (err)
 361                 return err;
 362
 363         return iscsi_conn_start(cls_conn);
 364 }
 365
 366 static struct iscsi_transport iscsi_iser_transport;
 367
 368 static struct iscsi_cls_session *
 369 iscsi_iser_session_create(struct iscsi_transport *iscsit,
 370                          struct scsi_transport_template *scsit,
 371                          uint16_t cmds_max, uint16_t qdepth,
 372                          uint32_t initial_cmdsn, uint32_t *hostno)
 373 {
 374         struct iscsi_cls_session *cls_session;
 375         struct iscsi_session *session;
 376         int i;
 377         uint32_t hn;
 378         struct iscsi_cmd_task  *ctask;
 379         struct iscsi_mgmt_task *mtask;
 380         struct iscsi_iser_cmd_task *iser_ctask;
 381         struct iser_desc *desc;
 382
 383         /*
 384          * we do not support setting can_queue cmd_per_lun from userspace yet
 385          * because we preallocate so many resources
 386          */
 387         cls_session = iscsi_session_setup(iscsit, scsit,
 388                                           ISCSI_DEF_XMIT_CMDS_MAX,
 389                                           ISCSI_MAX_CMD_PER_LUN,
 390                                           sizeof(struct iscsi_iser_cmd_task),
 391                                           sizeof(struct iser_desc),
 392                                           initial_cmdsn, &hn);
 393         if (!cls_session)
 394         return NULL;
 395
 396         *hostno = hn;
 397         session = class_to_transport_session(cls_session);
 398
 399         /* libiscsi setup itts, data and pool so just set desc fields */
 400         for (i = 0; i < session->cmds_max; i++) {
 401                 ctask      = session->cmds[i];
 402                 iser_ctask = ctask->dd_data;
 403                 ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
 404                 ctask->hdr_max = sizeof(iser_ctask->desc.iscsi_header);
 405         }
 406
 407         for (i = 0; i < session->mgmtpool_max; i++) {
 408                 mtask      = session->mgmt_cmds[i];
 409                 desc       = mtask->dd_data;
 410                 mtask->hdr = &desc->iscsi_header;
 411                 desc->data = mtask->data;
 412         }
 413
 414         return cls_session;
 415 }
 416
 417 static int
 418 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 419                      enum iscsi_param param, char *buf, int buflen)
 420 {
 421         int value;
 422
 423         switch (param) {
 424         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 425                 /* TBD */
 426                 break;
 427         case ISCSI_PARAM_HDRDGST_EN:
 428                 sscanf(buf, "%d", &value);
 429                 if (value) {
 430                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 431                         return -EPROTO;
 432                 }
 433                 break;
 434         case ISCSI_PARAM_DATADGST_EN:
 435                 sscanf(buf, "%d", &value);
 436                 if (value) {
 437                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 438                         return -EPROTO;
 439                 }
 440                 break;
 441         case ISCSI_PARAM_IFMARKER_EN:
 442                 sscanf(buf, "%d", &value);
 443                 if (value) {
 444                         printk(KERN_ERR "IFMarker wasn't negotiated to No");
 445                         return -EPROTO;
 446                 }
 447                 break;
 448         case ISCSI_PARAM_OFMARKER_EN:
 449                 sscanf(buf, "%d", &value);
 450                 if (value) {
 451                         printk(KERN_ERR "OFMarker wasn't negotiated to No");
 452                         return -EPROTO;
 453                 }
 454                 break;
 455         default:
 456                 return iscsi_set_param(cls_conn, param, buf, buflen);
 457         }
 458
 459         return 0;
 460 }
 461
 462 static void
 463 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 464 {
 465         struct iscsi_conn *conn = cls_conn->dd_data;
 466
 467         stats->txdata_octets = conn->txdata_octets;
 468         stats->rxdata_octets = conn->rxdata_octets;
 469         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 470         stats->dataout_pdus = conn->dataout_pdus_cnt;
 471         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 472         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 473         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 474         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 475         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 476         stats->custom_length = 3;
 477         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 478         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 479         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 480         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 481         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 482         stats->custom[2].value = conn->eh_abort_cnt;
 483 }
 484
 485 static int
 486 iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
 487                       __u64 *ep_handle)
 488 {
 489         int err;
 490         struct iser_conn *ib_conn;
 491
 492         err = iser_conn_init(&ib_conn);
 493         if (err)
 494                 goto out;
 495
 496         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
 497         if (!err)
 498                 *ep_handle = (__u64)(unsigned long)ib_conn;
 499
 500 out:
 501         return err;
 502 }
 503
 504 static int
 505 iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
 506 {
 507         struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
 508         int rc;
 509
 510         if (!ib_conn)
 511                 return -EINVAL;
 512
 513         rc = wait_event_interruptible_timeout(ib_conn->wait,
 514                              ib_conn->state == ISER_CONN_UP,
 515                              msecs_to_jiffies(timeout_ms));
 516
 517         /* if conn establishment failed, return error code to iscsi */
 518         if (!rc &&
 519             (ib_conn->state == ISER_CONN_TERMINATING ||
 520              ib_conn->state == ISER_CONN_DOWN))
 521                 rc = -1;
 522
 523         iser_err("ib conn %p rc = %d\n", ib_conn, rc);
 524
 525         if (rc > 0)
 526                 return 1; /* success, this is the equivalent of POLLOUT */
 527         else if (!rc)
 528                 return 0; /* timeout */
 529         else
 530                 return rc; /* signal */
 531 }
 532
 533 static void
 534 iscsi_iser_ep_disconnect(__u64 ep_handle)
 535 {
 536         struct iser_conn *ib_conn;
 537
 538         ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
 539         if (!ib_conn)
 540                 return;
 541
 542         iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
 543         iser_conn_terminate(ib_conn);
 544 }
 545
 546 static struct scsi_host_template iscsi_iser_sht = {
 547         .module                 = THIS_MODULE,
 548         .name                   = "iSCSI Initiator over iSER, v." DRV_VER,
 549         .queuecommand           = iscsi_queuecommand,
 550         .change_queue_depth     = iscsi_change_queue_depth,
 551         .can_queue              = ISCSI_DEF_XMIT_CMDS_MAX - 1,
 552         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 553         .max_sectors            = 1024,
 554         .cmd_per_lun            = ISCSI_MAX_CMD_PER_LUN,
 555         .eh_abort_handler       = iscsi_eh_abort,
 556         .eh_device_reset_handler= iscsi_eh_device_reset,
 557         .eh_host_reset_handler  = iscsi_eh_host_reset,
 558         .use_clustering         = DISABLE_CLUSTERING,
 559         .proc_name              = "iscsi_iser",
 560         .this_id                = -1,
 561 };
 562
 563 static struct iscsi_transport iscsi_iser_transport = {
 564         .owner                  = THIS_MODULE,
 565         .name                   = "iser",
 566         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 567         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 568                                   ISCSI_MAX_XMIT_DLENGTH |
 569                                   ISCSI_HDRDGST_EN |
 570                                   ISCSI_DATADGST_EN |
 571                                   ISCSI_INITIAL_R2T_EN |
 572                                   ISCSI_MAX_R2T |
 573                                   ISCSI_IMM_DATA_EN |
 574                                   ISCSI_FIRST_BURST |
 575                                   ISCSI_MAX_BURST |
 576                                   ISCSI_PDU_INORDER_EN |
 577                                   ISCSI_DATASEQ_INORDER_EN |
 578                                   ISCSI_EXP_STATSN |
 579                                   ISCSI_PERSISTENT_PORT |
 580                                   ISCSI_PERSISTENT_ADDRESS |
 581                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
 582                                   ISCSI_USERNAME | ISCSI_PASSWORD |
 583                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 584                                   ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 585                                   ISCSI_PING_TMO | ISCSI_RECV_TMO,
 586         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 587                                   ISCSI_HOST_NETDEV_NAME |
 588                                   ISCSI_HOST_INITIATOR_NAME,
 589         .host_template          = &iscsi_iser_sht,
 590         .conndata_size          = sizeof(struct iscsi_conn),
 591         .max_lun                = ISCSI_ISER_MAX_LUN,
 592         .max_cmd_len            = ISCSI_ISER_MAX_CMD_LEN,
 593         /* session management */
 594         .create_session         = iscsi_iser_session_create,
 595         .destroy_session        = iscsi_session_teardown,
 596         /* connection management */
 597         .create_conn            = iscsi_iser_conn_create,
 598         .bind_conn              = iscsi_iser_conn_bind,
 599         .destroy_conn           = iscsi_iser_conn_destroy,
 600         .set_param              = iscsi_iser_set_param,
 601         .get_conn_param         = iscsi_conn_get_param,
 602         .get_session_param      = iscsi_session_get_param,
 603         .start_conn             = iscsi_iser_conn_start,
 604         .stop_conn              = iscsi_conn_stop,
 605         /* iscsi host params */
 606         .get_host_param         = iscsi_host_get_param,
 607         .set_host_param         = iscsi_host_set_param,
 608         /* IO */
 609         .send_pdu               = iscsi_conn_send_pdu,
 610         .get_stats              = iscsi_iser_conn_get_stats,
 611         .init_cmd_task          = iscsi_iser_cmd_init,
 612         .xmit_cmd_task          = iscsi_iser_ctask_xmit,
 613         .xmit_mgmt_task         = iscsi_iser_mtask_xmit,
 614         .cleanup_cmd_task       = iscsi_iser_cleanup_ctask,
 615         /* recovery */
 616         .session_recovery_timedout = iscsi_session_recovery_timedout,
 617
 618         .ep_connect             = iscsi_iser_ep_connect,
 619         .ep_poll                = iscsi_iser_ep_poll,
 620         .ep_disconnect          = iscsi_iser_ep_disconnect
 621 };
 622
 623 static int __init iser_init(void)
 624 {
 625         int err;
 626
 627         iser_dbg("Starting iSER datamover...\n");
 628
 629         if (iscsi_max_lun < 1) {
 630                 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
 631                 return -EINVAL;
 632         }
 633
 634         iscsi_iser_transport.max_lun = iscsi_max_lun;
 635
 636         memset(&ig, 0, sizeof(struct iser_global));
 637
 638         ig.desc_cache = kmem_cache_create("iser_descriptors",
 639                                           sizeof (struct iser_desc),
 640                                           0, SLAB_HWCACHE_ALIGN,
 641                                           NULL);
 642         if (ig.desc_cache == NULL)
 643                 return -ENOMEM;
 644
 645         /* device init is called only after the first addr resolution */
 646         mutex_init(&ig.device_list_mutex);
 647         INIT_LIST_HEAD(&ig.device_list);
 648         mutex_init(&ig.connlist_mutex);
 649         INIT_LIST_HEAD(&ig.connlist);
 650
 651         if (!iscsi_register_transport(&iscsi_iser_transport)) {
 652                 iser_err("iscsi_register_transport failed\n");
 653                 err = -EINVAL;
 654                 goto register_transport_failure;
 655         }
 656
 657         return 0;
 658
 659 register_transport_failure:
 660         kmem_cache_destroy(ig.desc_cache);
 661
 662         return err;
 663 }
 664
 665 static void __exit iser_exit(void)
 666 {
 667         iser_dbg("Removing iSER datamover...\n");
 668         iscsi_unregister_transport(&iscsi_iser_transport);
 669         kmem_cache_destroy(ig.desc_cache);
 670 }
 671
 672 module_init(iser_init);
 673 module_exit(iser_exit);