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 void
 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 }
 142
 143 /**
 144  * iscsi_mtask_xmit - xmit management(immediate) task
 145  * @conn: iscsi connection
 146  * @mtask: task management task
 147  *
 148  * Notes:
 149  *      The function can return -EAGAIN in which case caller must
 150  *      call it again later, or recover. '0' return code means successful
 151  *      xmit.
 152  *
 153  **/
 154 static int
 155 iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
 156                       struct iscsi_mgmt_task *mtask)
 157 {
 158         int error = 0;
 159
 160         debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
 161
 162         error = iser_send_control(conn, mtask);
 163
 164         /* since iser xmits control with zero copy, mtasks can not be recycled
 165          * right after sending them.
 166          * The recycling scheme is based on whether a response is expected
 167          * - if yes, the mtask is recycled at iscsi_complete_pdu
 168          * - if no,  the mtask is recycled at iser_snd_completion
 169          */
 170         if (error && error != -ENOBUFS)
 171                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 172
 173         return error;
 174 }
 175
 176 static int
 177 iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
 178                                  struct iscsi_cmd_task *ctask)
 179 {
 180         struct iscsi_data  hdr;
 181         int error = 0;
 182
 183         /* Send data-out PDUs while there's still unsolicited data to send */
 184         while (ctask->unsol_count > 0) {
 185                 iscsi_prep_unsolicit_data_pdu(ctask, &hdr);
 186                 debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
 187                            hdr.itt, ctask->data_count);
 188
 189                 /* the buffer description has been passed with the command */
 190                 /* Send the command */
 191                 error = iser_send_data_out(conn, ctask, &hdr);
 192                 if (error) {
 193                         ctask->unsol_datasn--;
 194                         goto iscsi_iser_ctask_xmit_unsol_data_exit;
 195                 }
 196                 ctask->unsol_count -= ctask->data_count;
 197                 debug_scsi("Need to send %d more as data-out PDUs\n",
 198                            ctask->unsol_count);
 199         }
 200
 201 iscsi_iser_ctask_xmit_unsol_data_exit:
 202         return error;
 203 }
 204
 205 static int
 206 iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
 207                       struct iscsi_cmd_task *ctask)
 208 {
 209         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 210         int error = 0;
 211
 212         if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) {
 213                 BUG_ON(scsi_bufflen(ctask->sc) == 0);
 214
 215                 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
 216                            ctask->itt, scsi_bufflen(ctask->sc),
 217                            ctask->imm_count, ctask->unsol_count);
 218         }
 219
 220         debug_scsi("ctask deq [cid %d itt 0x%x]\n",
 221                    conn->id, ctask->itt);
 222
 223         /* Send the cmd PDU */
 224         if (!iser_ctask->command_sent) {
 225                 error = iser_send_command(conn, ctask);
 226                 if (error)
 227                         goto iscsi_iser_ctask_xmit_exit;
 228                 iser_ctask->command_sent = 1;
 229         }
 230
 231         /* Send unsolicited data-out PDU(s) if necessary */
 232         if (ctask->unsol_count)
 233                 error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
 234
 235  iscsi_iser_ctask_xmit_exit:
 236         if (error && error != -ENOBUFS)
 237                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 238         return error;
 239 }
 240
 241 static void
 242 iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
 243 {
 244         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 245
 246         if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
 247                 iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
 248                 iser_ctask_rdma_finalize(iser_ctask);
 249         }
 250 }
 251
 252 static struct iser_conn *
 253 iscsi_iser_ib_conn_lookup(__u64 ep_handle)
 254 {
 255         struct iser_conn *ib_conn;
 256         struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
 257
 258         mutex_lock(&ig.connlist_mutex);
 259         list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
 260                 if (ib_conn == uib_conn) {
 261                         mutex_unlock(&ig.connlist_mutex);
 262                         return ib_conn;
 263                 }
 264         }
 265         mutex_unlock(&ig.connlist_mutex);
 266         iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
 267         return NULL;
 268 }
 269
 270 static struct iscsi_cls_conn *
 271 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 272 {
 273         struct iscsi_conn *conn;
 274         struct iscsi_cls_conn *cls_conn;
 275         struct iscsi_iser_conn *iser_conn;
 276
 277         cls_conn = iscsi_conn_setup(cls_session, conn_idx);
 278         if (!cls_conn)
 279                 return NULL;
 280         conn = cls_conn->dd_data;
 281
 282         /*
 283          * due to issues with the login code re iser sematics
 284          * this not set in iscsi_conn_setup - FIXME
 285          */
 286         conn->max_recv_dlength = 128;
 287
 288         iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
 289         if (!iser_conn)
 290                 goto conn_alloc_fail;
 291
 292         /* currently this is the only field which need to be initiated */
 293         rwlock_init(&iser_conn->lock);
 294
 295         conn->dd_data = iser_conn;
 296         iser_conn->iscsi_conn = conn;
 297
 298         return cls_conn;
 299
 300 conn_alloc_fail:
 301         iscsi_conn_teardown(cls_conn);
 302         return NULL;
 303 }
 304
 305 static void
 306 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 307 {
 308         struct iscsi_conn *conn = cls_conn->dd_data;
 309         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 310
 311         iscsi_conn_teardown(cls_conn);
 312         if (iser_conn->ib_conn)
 313                 iser_conn->ib_conn->iser_conn = NULL;
 314         kfree(iser_conn);
 315 }
 316
 317 static int
 318 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 319                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 320                      int is_leading)
 321 {
 322         struct iscsi_conn *conn = cls_conn->dd_data;
 323         struct iscsi_iser_conn *iser_conn;
 324         struct iser_conn *ib_conn;
 325         int error;
 326
 327         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 328         if (error)
 329                 return error;
 330
 331         /* the transport ep handle comes from user space so it must be
 332          * verified against the global ib connections list */
 333         ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
 334         if (!ib_conn) {
 335                 iser_err("can't bind eph %llx\n",
 336                          (unsigned long long)transport_eph);
 337                 return -EINVAL;
 338         }
 339         /* binds the iSER connection retrieved from the previously
 340          * connected ep_handle to the iSCSI layer connection. exchanges
 341          * connection pointers */
 342         iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
 343         iser_conn = conn->dd_data;
 344         ib_conn->iser_conn = iser_conn;
 345         iser_conn->ib_conn  = ib_conn;
 346
 347         conn->recv_lock = &iser_conn->lock;
 348
 349         return 0;
 350 }
 351
 352 static int
 353 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 354 {
 355         struct iscsi_conn *conn = cls_conn->dd_data;
 356         int err;
 357
 358         err = iser_conn_set_full_featured_mode(conn);
 359         if (err)
 360                 return err;
 361
 362         return iscsi_conn_start(cls_conn);
 363 }
 364
 365 static struct iscsi_transport iscsi_iser_transport;
 366
 367 static struct iscsi_cls_session *
 368 iscsi_iser_session_create(struct iscsi_transport *iscsit,
 369                          struct scsi_transport_template *scsit,
 370                          uint16_t cmds_max, uint16_t qdepth,
 371                          uint32_t initial_cmdsn, uint32_t *hostno)
 372 {
 373         struct iscsi_cls_session *cls_session;
 374         struct iscsi_session *session;
 375         int i;
 376         uint32_t hn;
 377         struct iscsi_cmd_task  *ctask;
 378         struct iscsi_mgmt_task *mtask;
 379         struct iscsi_iser_cmd_task *iser_ctask;
 380         struct iser_desc *desc;
 381
 382         /*
 383          * we do not support setting can_queue cmd_per_lun from userspace yet
 384          * because we preallocate so many resources
 385          */
 386         cls_session = iscsi_session_setup(iscsit, scsit,
 387                                           ISCSI_DEF_XMIT_CMDS_MAX,
 388                                           ISCSI_MAX_CMD_PER_LUN,
 389                                           sizeof(struct iscsi_iser_cmd_task),
 390                                           sizeof(struct iser_desc),
 391                                           initial_cmdsn, &hn);
 392         if (!cls_session)
 393         return NULL;
 394
 395         *hostno = hn;
 396         session = class_to_transport_session(cls_session);
 397
 398         /* libiscsi setup itts, data and pool so just set desc fields */
 399         for (i = 0; i < session->cmds_max; i++) {
 400                 ctask      = session->cmds[i];
 401                 iser_ctask = ctask->dd_data;
 402                 ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
 403         }
 404
 405         for (i = 0; i < session->mgmtpool_max; i++) {
 406                 mtask      = session->mgmt_cmds[i];
 407                 desc       = mtask->dd_data;
 408                 mtask->hdr = &desc->iscsi_header;
 409                 desc->data = mtask->data;
 410         }
 411
 412         return cls_session;
 413 }
 414
 415 static int
 416 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 417                      enum iscsi_param param, char *buf, int buflen)
 418 {
 419         int value;
 420
 421         switch (param) {
 422         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 423                 /* TBD */
 424                 break;
 425         case ISCSI_PARAM_HDRDGST_EN:
 426                 sscanf(buf, "%d", &value);
 427                 if (value) {
 428                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 429                         return -EPROTO;
 430                 }
 431                 break;
 432         case ISCSI_PARAM_DATADGST_EN:
 433                 sscanf(buf, "%d", &value);
 434                 if (value) {
 435                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 436                         return -EPROTO;
 437                 }
 438                 break;
 439         case ISCSI_PARAM_IFMARKER_EN:
 440                 sscanf(buf, "%d", &value);
 441                 if (value) {
 442                         printk(KERN_ERR "IFMarker wasn't negotiated to No");
 443                         return -EPROTO;
 444                 }
 445                 break;
 446         case ISCSI_PARAM_OFMARKER_EN:
 447                 sscanf(buf, "%d", &value);
 448                 if (value) {
 449                         printk(KERN_ERR "OFMarker wasn't negotiated to No");
 450                         return -EPROTO;
 451                 }
 452                 break;
 453         default:
 454                 return iscsi_set_param(cls_conn, param, buf, buflen);
 455         }
 456
 457         return 0;
 458 }
 459
 460 static void
 461 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 462 {
 463         struct iscsi_conn *conn = cls_conn->dd_data;
 464
 465         stats->txdata_octets = conn->txdata_octets;
 466         stats->rxdata_octets = conn->rxdata_octets;
 467         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 468         stats->dataout_pdus = conn->dataout_pdus_cnt;
 469         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 470         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 471         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 472         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 473         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 474         stats->custom_length = 3;
 475         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 476         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 477         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 478         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 479         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 480         stats->custom[2].value = conn->eh_abort_cnt;
 481 }
 482
 483 static int
 484 iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
 485                       __u64 *ep_handle)
 486 {
 487         int err;
 488         struct iser_conn *ib_conn;
 489
 490         err = iser_conn_init(&ib_conn);
 491         if (err)
 492                 goto out;
 493
 494         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
 495         if (!err)
 496                 *ep_handle = (__u64)(unsigned long)ib_conn;
 497
 498 out:
 499         return err;
 500 }
 501
 502 static int
 503 iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
 504 {
 505         struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
 506         int rc;
 507
 508         if (!ib_conn)
 509                 return -EINVAL;
 510
 511         rc = wait_event_interruptible_timeout(ib_conn->wait,
 512                              ib_conn->state == ISER_CONN_UP,
 513                              msecs_to_jiffies(timeout_ms));
 514
 515         /* if conn establishment failed, return error code to iscsi */
 516         if (!rc &&
 517             (ib_conn->state == ISER_CONN_TERMINATING ||
 518              ib_conn->state == ISER_CONN_DOWN))
 519                 rc = -1;
 520
 521         iser_err("ib conn %p rc = %d\n", ib_conn, rc);
 522
 523         if (rc > 0)
 524                 return 1; /* success, this is the equivalent of POLLOUT */
 525         else if (!rc)
 526                 return 0; /* timeout */
 527         else
 528                 return rc; /* signal */
 529 }
 530
 531 static void
 532 iscsi_iser_ep_disconnect(__u64 ep_handle)
 533 {
 534         struct iser_conn *ib_conn;
 535
 536         ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
 537         if (!ib_conn)
 538                 return;
 539
 540         iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
 541         iser_conn_terminate(ib_conn);
 542 }
 543
 544 static struct scsi_host_template iscsi_iser_sht = {
 545         .module                 = THIS_MODULE,
 546         .name                   = "iSCSI Initiator over iSER, v." DRV_VER,
 547         .queuecommand           = iscsi_queuecommand,
 548         .can_queue              = ISCSI_DEF_XMIT_CMDS_MAX - 1,
 549         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 550         .max_sectors            = 1024,
 551         .cmd_per_lun            = ISCSI_MAX_CMD_PER_LUN,
 552         .eh_abort_handler       = iscsi_eh_abort,
 553         .eh_host_reset_handler  = iscsi_eh_host_reset,
 554         .use_clustering         = DISABLE_CLUSTERING,
 555         .proc_name              = "iscsi_iser",
 556         .this_id                = -1,
 557 };
 558
 559 static struct iscsi_transport iscsi_iser_transport = {
 560         .owner                  = THIS_MODULE,
 561         .name                   = "iser",
 562         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 563         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 564                                   ISCSI_MAX_XMIT_DLENGTH |
 565                                   ISCSI_HDRDGST_EN |
 566                                   ISCSI_DATADGST_EN |
 567                                   ISCSI_INITIAL_R2T_EN |
 568                                   ISCSI_MAX_R2T |
 569                                   ISCSI_IMM_DATA_EN |
 570                                   ISCSI_FIRST_BURST |
 571                                   ISCSI_MAX_BURST |
 572                                   ISCSI_PDU_INORDER_EN |
 573                                   ISCSI_DATASEQ_INORDER_EN |
 574                                   ISCSI_EXP_STATSN |
 575                                   ISCSI_PERSISTENT_PORT |
 576                                   ISCSI_PERSISTENT_ADDRESS |
 577                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
 578                                   ISCSI_USERNAME | ISCSI_PASSWORD |
 579                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
 580         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 581                                   ISCSI_HOST_NETDEV_NAME |
 582                                   ISCSI_HOST_INITIATOR_NAME,
 583         .host_template          = &iscsi_iser_sht,
 584         .conndata_size          = sizeof(struct iscsi_conn),
 585         .max_lun                = ISCSI_ISER_MAX_LUN,
 586         .max_cmd_len            = ISCSI_ISER_MAX_CMD_LEN,
 587         /* session management */
 588         .create_session         = iscsi_iser_session_create,
 589         .destroy_session        = iscsi_session_teardown,
 590         /* connection management */
 591         .create_conn            = iscsi_iser_conn_create,
 592         .bind_conn              = iscsi_iser_conn_bind,
 593         .destroy_conn           = iscsi_iser_conn_destroy,
 594         .set_param              = iscsi_iser_set_param,
 595         .get_conn_param         = iscsi_conn_get_param,
 596         .get_session_param      = iscsi_session_get_param,
 597         .start_conn             = iscsi_iser_conn_start,
 598         .stop_conn              = iscsi_conn_stop,
 599         /* iscsi host params */
 600         .get_host_param         = iscsi_host_get_param,
 601         .set_host_param         = iscsi_host_set_param,
 602         /* IO */
 603         .send_pdu               = iscsi_conn_send_pdu,
 604         .get_stats              = iscsi_iser_conn_get_stats,
 605         .init_cmd_task          = iscsi_iser_cmd_init,
 606         .xmit_cmd_task          = iscsi_iser_ctask_xmit,
 607         .xmit_mgmt_task         = iscsi_iser_mtask_xmit,
 608         .cleanup_cmd_task       = iscsi_iser_cleanup_ctask,
 609         /* recovery */
 610         .session_recovery_timedout = iscsi_session_recovery_timedout,
 611
 612         .ep_connect             = iscsi_iser_ep_connect,
 613         .ep_poll                = iscsi_iser_ep_poll,
 614         .ep_disconnect          = iscsi_iser_ep_disconnect
 615 };
 616
 617 static int __init iser_init(void)
 618 {
 619         int err;
 620
 621         iser_dbg("Starting iSER datamover...\n");
 622
 623         if (iscsi_max_lun < 1) {
 624                 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
 625                 return -EINVAL;
 626         }
 627
 628         iscsi_iser_transport.max_lun = iscsi_max_lun;
 629
 630         memset(&ig, 0, sizeof(struct iser_global));
 631
 632         ig.desc_cache = kmem_cache_create("iser_descriptors",
 633                                           sizeof (struct iser_desc),
 634                                           0, SLAB_HWCACHE_ALIGN,
 635                                           NULL);
 636         if (ig.desc_cache == NULL)
 637                 return -ENOMEM;
 638
 639         /* device init is called only after the first addr resolution */
 640         mutex_init(&ig.device_list_mutex);
 641         INIT_LIST_HEAD(&ig.device_list);
 642         mutex_init(&ig.connlist_mutex);
 643         INIT_LIST_HEAD(&ig.connlist);
 644
 645         if (!iscsi_register_transport(&iscsi_iser_transport)) {
 646                 iser_err("iscsi_register_transport failed\n");
 647                 err = -EINVAL;
 648                 goto register_transport_failure;
 649         }
 650
 651         return 0;
 652
 653 register_transport_failure:
 654         kmem_cache_destroy(ig.desc_cache);
 655
 656         return err;
 657 }
 658
 659 static void __exit iser_exit(void)
 660 {
 661         iser_dbg("Removing iSER datamover...\n");
 662         iscsi_unregister_transport(&iscsi_iser_transport);
 663         kmem_cache_destroy(ig.desc_cache);
 664 }
 665
 666 module_init(iser_init);
 667 module_exit(iser_exit);