release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <linux/types.h>
  48 #include <linux/list.h>
  49 #include <linux/hardirq.h>
  50 #include <linux/kfifo.h>
  51 #include <linux/blkdev.h>
  52 #include <linux/init.h>
  53 #include <linux/ioctl.h>
  54 #include <linux/cdev.h>
  55 #include <linux/in.h>
  56 #include <linux/net.h>
  57 #include <linux/scatterlist.h>
  58 #include <linux/delay.h>
  59 #include <linux/slab.h>
  60
  61 #include <net/sock.h>
  62
  63 #include <asm/uaccess.h>
  64
  65 #include <scsi/scsi_cmnd.h>
  66 #include <scsi/scsi_device.h>
  67 #include <scsi/scsi_eh.h>
  68 #include <scsi/scsi_tcq.h>
  69 #include <scsi/scsi_host.h>
  70 #include <scsi/scsi.h>
  71 #include <scsi/scsi_transport_iscsi.h>
  72
  73 #include "iscsi_iser.h"
  74
  75 static struct scsi_host_template iscsi_iser_sht;
  76 static struct iscsi_transport iscsi_iser_transport;
  77 static struct scsi_transport_template *iscsi_iser_scsi_transport;
  78
  79 static unsigned int iscsi_max_lun = 512;
  80 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
  81
  82 int iser_debug_level = 0;
  83
  84 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
  85                    "v" DRV_VER " (" DRV_DATE ")");
  86 MODULE_LICENSE("Dual BSD/GPL");
  87 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
  88
  89 module_param_named(debug_level, iser_debug_level, int, 0644);
  90 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
  91
  92 struct iser_global ig;
  93
  94 void
  95 iscsi_iser_recv(struct iscsi_conn *conn,
  96                 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
  97 {
  98         int rc = 0;
  99         int datalen;
 100         int ahslen;
 101
 102         /* verify PDU length */
 103         datalen = ntoh24(hdr->dlength);
 104         if (datalen != rx_data_len) {
 105                 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
 106                        datalen, rx_data_len);
 107                 rc = ISCSI_ERR_DATALEN;
 108                 goto error;
 109         }
 110
 111         /* read AHS */
 112         ahslen = hdr->hlength * 4;
 113
 114         rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
 115         if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
 116                 goto error;
 117
 118         return;
 119 error:
 120         iscsi_conn_failure(conn, rc);
 121 }
 122
 123 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
 124 {
 125         struct iscsi_iser_task *iser_task = task->dd_data;
 126
 127         task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
 128         task->hdr_max = sizeof(iser_task->desc.iscsi_header);
 129         return 0;
 130 }
 131
 132 int iser_initialize_task_headers(struct iscsi_task *task,
 133                                                 struct iser_tx_desc *tx_desc)
 134 {
 135         struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
 136         struct iser_device     *device    = iser_conn->ib_conn->device;
 137         struct iscsi_iser_task *iser_task = task->dd_data;
 138         u64 dma_addr;
 139
 140         dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
 141                                 ISER_HEADERS_LEN, DMA_TO_DEVICE);
 142         if (ib_dma_mapping_error(device->ib_device, dma_addr))
 143                 return -ENOMEM;
 144
 145         tx_desc->dma_addr = dma_addr;
 146         tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;
 147         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 148         tx_desc->tx_sg[0].lkey   = device->mr->lkey;
 149
 150         iser_task->headers_initialized  = 1;
 151         iser_task->iser_conn            = iser_conn;
 152         return 0;
 153 }
 154 /**
 155  * iscsi_iser_task_init - Initialize task
 156  * @task: iscsi task
 157  *
 158  * Initialize the task for the scsi command or mgmt command.
 159  */
 160 static int
 161 iscsi_iser_task_init(struct iscsi_task *task)
 162 {
 163         struct iscsi_iser_task *iser_task = task->dd_data;
 164
 165         if (!iser_task->headers_initialized)
 166                 if (iser_initialize_task_headers(task, &iser_task->desc))
 167                         return -ENOMEM;
 168
 169         /* mgmt task */
 170         if (!task->sc)
 171                 return 0;
 172
 173         iser_task->command_sent = 0;
 174         iser_task_rdma_init(iser_task);
 175         return 0;
 176 }
 177
 178 /**
 179  * iscsi_iser_mtask_xmit - xmit management(immediate) task
 180  * @conn: iscsi connection
 181  * @task: task management task
 182  *
 183  * Notes:
 184  *      The function can return -EAGAIN in which case caller must
 185  *      call it again later, or recover. '0' return code means successful
 186  *      xmit.
 187  *
 188  **/
 189 static int
 190 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
 191 {
 192         int error = 0;
 193
 194         iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
 195
 196         error = iser_send_control(conn, task);
 197
 198         /* since iser xmits control with zero copy, tasks can not be recycled
 199          * right after sending them.
 200          * The recycling scheme is based on whether a response is expected
 201          * - if yes, the task is recycled at iscsi_complete_pdu
 202          * - if no,  the task is recycled at iser_snd_completion
 203          */
 204         return error;
 205 }
 206
 207 static int
 208 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
 209                                  struct iscsi_task *task)
 210 {
 211         struct iscsi_r2t_info *r2t = &task->unsol_r2t;
 212         struct iscsi_data hdr;
 213         int error = 0;
 214
 215         /* Send data-out PDUs while there's still unsolicited data to send */
 216         while (iscsi_task_has_unsol_data(task)) {
 217                 iscsi_prep_data_out_pdu(task, r2t, &hdr);
 218                 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
 219                            hdr.itt, r2t->data_count);
 220
 221                 /* the buffer description has been passed with the command */
 222                 /* Send the command */
 223                 error = iser_send_data_out(conn, task, &hdr);
 224                 if (error) {
 225                         r2t->datasn--;
 226                         goto iscsi_iser_task_xmit_unsol_data_exit;
 227                 }
 228                 r2t->sent += r2t->data_count;
 229                 iser_dbg("Need to send %d more as data-out PDUs\n",
 230                            r2t->data_length - r2t->sent);
 231         }
 232
 233 iscsi_iser_task_xmit_unsol_data_exit:
 234         return error;
 235 }
 236
 237 static int
 238 iscsi_iser_task_xmit(struct iscsi_task *task)
 239 {
 240         struct iscsi_conn *conn = task->conn;
 241         struct iscsi_iser_task *iser_task = task->dd_data;
 242         int error = 0;
 243
 244         if (!task->sc)
 245                 return iscsi_iser_mtask_xmit(conn, task);
 246
 247         if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
 248                 BUG_ON(scsi_bufflen(task->sc) == 0);
 249
 250                 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
 251                            task->itt, scsi_bufflen(task->sc),
 252                            task->imm_count, task->unsol_r2t.data_length);
 253         }
 254
 255         iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
 256                    conn->id, task->itt);
 257
 258         /* Send the cmd PDU */
 259         if (!iser_task->command_sent) {
 260                 error = iser_send_command(conn, task);
 261                 if (error)
 262                         goto iscsi_iser_task_xmit_exit;
 263                 iser_task->command_sent = 1;
 264         }
 265
 266         /* Send unsolicited data-out PDU(s) if necessary */
 267         if (iscsi_task_has_unsol_data(task))
 268                 error = iscsi_iser_task_xmit_unsol_data(conn, task);
 269
 270  iscsi_iser_task_xmit_exit:
 271         return error;
 272 }
 273
 274 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
 275 {
 276         struct iscsi_iser_task *iser_task = task->dd_data;
 277
 278         /* mgmt tasks do not need special cleanup */
 279         if (!task->sc)
 280                 return;
 281
 282         if (iser_task->status == ISER_TASK_STATUS_STARTED) {
 283                 iser_task->status = ISER_TASK_STATUS_COMPLETED;
 284                 iser_task_rdma_finalize(iser_task);
 285         }
 286 }
 287
 288 static struct iscsi_cls_conn *
 289 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 290 {
 291         struct iscsi_conn *conn;
 292         struct iscsi_cls_conn *cls_conn;
 293         struct iscsi_iser_conn *iser_conn;
 294
 295         cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
 296         if (!cls_conn)
 297                 return NULL;
 298         conn = cls_conn->dd_data;
 299
 300         conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
 301
 302         iser_conn = conn->dd_data;
 303         conn->dd_data = iser_conn;
 304         iser_conn->iscsi_conn = conn;
 305
 306         return cls_conn;
 307 }
 308
 309 static void
 310 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 311 {
 312         struct iscsi_conn *conn = cls_conn->dd_data;
 313         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 314         struct iser_conn *ib_conn = iser_conn->ib_conn;
 315
 316         iscsi_conn_teardown(cls_conn);
 317         /*
 318          * Userspace will normally call the stop callback and
 319          * already have freed the ib_conn, but if it goofed up then
 320          * we free it here.
 321          */
 322         if (ib_conn) {
 323                 ib_conn->iser_conn = NULL;
 324                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 325         }
 326 }
 327
 328 static int
 329 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 330                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 331                      int is_leading)
 332 {
 333         struct iscsi_conn *conn = cls_conn->dd_data;
 334         struct iscsi_iser_conn *iser_conn;
 335         struct iser_conn *ib_conn;
 336         struct iscsi_endpoint *ep;
 337         int error;
 338
 339         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 340         if (error)
 341                 return error;
 342
 343         /* the transport ep handle comes from user space so it must be
 344          * verified against the global ib connections list */
 345         ep = iscsi_lookup_endpoint(transport_eph);
 346         if (!ep) {
 347                 iser_err("can't bind eph %llx\n",
 348                          (unsigned long long)transport_eph);
 349                 return -EINVAL;
 350         }
 351         ib_conn = ep->dd_data;
 352
 353         /* binds the iSER connection retrieved from the previously
 354          * connected ep_handle to the iSCSI layer connection. exchanges
 355          * connection pointers */
 356         iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n",
 357                                         conn, conn->dd_data, ib_conn);
 358         iser_conn = conn->dd_data;
 359         ib_conn->iser_conn = iser_conn;
 360         iser_conn->ib_conn  = ib_conn;
 361         iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
 362         return 0;
 363 }
 364
 365 static void
 366 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 367 {
 368         struct iscsi_conn *conn = cls_conn->dd_data;
 369         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 370         struct iser_conn *ib_conn = iser_conn->ib_conn;
 371
 372         /*
 373          * Userspace may have goofed up and not bound the connection or
 374          * might have only partially setup the connection.
 375          */
 376         if (ib_conn) {
 377                 iscsi_conn_stop(cls_conn, flag);
 378                 /*
 379                  * There is no unbind event so the stop callback
 380                  * must release the ref from the bind.
 381                  */
 382                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 383         }
 384         iser_conn->ib_conn = NULL;
 385 }
 386
 387 static int
 388 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 389 {
 390         struct iscsi_conn *conn = cls_conn->dd_data;
 391         int err;
 392
 393         err = iser_conn_set_full_featured_mode(conn);
 394         if (err)
 395                 return err;
 396
 397         return iscsi_conn_start(cls_conn);
 398 }
 399
 400 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 401 {
 402         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 403
 404         iscsi_session_teardown(cls_session);
 405         iscsi_host_remove(shost);
 406         iscsi_host_free(shost);
 407 }
 408
 409 static struct iscsi_cls_session *
 410 iscsi_iser_session_create(struct iscsi_endpoint *ep,
 411                           uint16_t cmds_max, uint16_t qdepth,
 412                           uint32_t initial_cmdsn)
 413 {
 414         struct iscsi_cls_session *cls_session;
 415         struct iscsi_session *session;
 416         struct Scsi_Host *shost;
 417         struct iser_conn *ib_conn;
 418
 419         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
 420         if (!shost)
 421                 return NULL;
 422         shost->transportt = iscsi_iser_scsi_transport;
 423         shost->max_lun = iscsi_max_lun;
 424         shost->max_id = 0;
 425         shost->max_channel = 0;
 426         shost->max_cmd_len = 16;
 427
 428         /*
 429          * older userspace tools (before 2.0-870) did not pass us
 430          * the leading conn's ep so this will be NULL;
 431          */
 432         if (ep)
 433                 ib_conn = ep->dd_data;
 434
 435         if (iscsi_host_add(shost,
 436                            ep ? ib_conn->device->ib_device->dma_device : NULL))
 437                 goto free_host;
 438
 439         /*
 440          * we do not support setting can_queue cmd_per_lun from userspace yet
 441          * because we preallocate so many resources
 442          */
 443         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 444                                           ISCSI_DEF_XMIT_CMDS_MAX, 0,
 445                                           sizeof(struct iscsi_iser_task),
 446                                           initial_cmdsn, 0);
 447         if (!cls_session)
 448                 goto remove_host;
 449         session = cls_session->dd_data;
 450
 451         shost->can_queue = session->scsi_cmds_max;
 452         return cls_session;
 453
 454 remove_host:
 455         iscsi_host_remove(shost);
 456 free_host:
 457         iscsi_host_free(shost);
 458         return NULL;
 459 }
 460
 461 static int
 462 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 463                      enum iscsi_param param, char *buf, int buflen)
 464 {
 465         int value;
 466
 467         switch (param) {
 468         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 469                 /* TBD */
 470                 break;
 471         case ISCSI_PARAM_HDRDGST_EN:
 472                 sscanf(buf, "%d", &value);
 473                 if (value) {
 474                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 475                         return -EPROTO;
 476                 }
 477                 break;
 478         case ISCSI_PARAM_DATADGST_EN:
 479                 sscanf(buf, "%d", &value);
 480                 if (value) {
 481                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 482                         return -EPROTO;
 483                 }
 484                 break;
 485         case ISCSI_PARAM_IFMARKER_EN:
 486                 sscanf(buf, "%d", &value);
 487                 if (value) {
 488                         printk(KERN_ERR "IFMarker wasn't negotiated to No");
 489                         return -EPROTO;
 490                 }
 491                 break;
 492         case ISCSI_PARAM_OFMARKER_EN:
 493                 sscanf(buf, "%d", &value);
 494                 if (value) {
 495                         printk(KERN_ERR "OFMarker wasn't negotiated to No");
 496                         return -EPROTO;
 497                 }
 498                 break;
 499         default:
 500                 return iscsi_set_param(cls_conn, param, buf, buflen);
 501         }
 502
 503         return 0;
 504 }
 505
 506 static void
 507 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 508 {
 509         struct iscsi_conn *conn = cls_conn->dd_data;
 510
 511         stats->txdata_octets = conn->txdata_octets;
 512         stats->rxdata_octets = conn->rxdata_octets;
 513         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 514         stats->dataout_pdus = conn->dataout_pdus_cnt;
 515         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 516         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 517         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 518         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 519         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 520         stats->custom_length = 4;
 521         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 522         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 523         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 524         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 525         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 526         stats->custom[2].value = conn->eh_abort_cnt;
 527         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 528         stats->custom[3].value = conn->fmr_unalign_cnt;
 529 }
 530
 531 static struct iscsi_endpoint *
 532 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
 533                       int non_blocking)
 534 {
 535         int err;
 536         struct iser_conn *ib_conn;
 537         struct iscsi_endpoint *ep;
 538
 539         ep = iscsi_create_endpoint(sizeof(*ib_conn));
 540         if (!ep)
 541                 return ERR_PTR(-ENOMEM);
 542
 543         ib_conn = ep->dd_data;
 544         ib_conn->ep = ep;
 545         iser_conn_init(ib_conn);
 546
 547         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
 548                            non_blocking);
 549         if (err) {
 550                 iscsi_destroy_endpoint(ep);
 551                 return ERR_PTR(err);
 552         }
 553         return ep;
 554 }
 555
 556 static int
 557 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 558 {
 559         struct iser_conn *ib_conn;
 560         int rc;
 561
 562         ib_conn = ep->dd_data;
 563         rc = wait_event_interruptible_timeout(ib_conn->wait,
 564                              ib_conn->state == ISER_CONN_UP,
 565                              msecs_to_jiffies(timeout_ms));
 566
 567         /* if conn establishment failed, return error code to iscsi */
 568         if (!rc &&
 569             (ib_conn->state == ISER_CONN_TERMINATING ||
 570              ib_conn->state == ISER_CONN_DOWN))
 571                 rc = -1;
 572
 573         iser_err("ib conn %p rc = %d\n", ib_conn, rc);
 574
 575         if (rc > 0)
 576                 return 1; /* success, this is the equivalent of POLLOUT */
 577         else if (!rc)
 578                 return 0; /* timeout */
 579         else
 580                 return rc; /* signal */
 581 }
 582
 583 static void
 584 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 585 {
 586         struct iser_conn *ib_conn;
 587
 588         ib_conn = ep->dd_data;
 589         if (ib_conn->iser_conn)
 590                 /*
 591                  * Must suspend xmit path if the ep is bound to the
 592                  * iscsi_conn, so we know we are not accessing the ib_conn
 593                  * when we free it.
 594                  *
 595                  * This may not be bound if the ep poll failed.
 596                  */
 597                 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
 598
 599
 600         iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
 601         iser_conn_terminate(ib_conn);
 602 }
 603
 604 static struct scsi_host_template iscsi_iser_sht = {
 605         .module                 = THIS_MODULE,
 606         .name                   = "iSCSI Initiator over iSER, v." DRV_VER,
 607         .queuecommand           = iscsi_queuecommand,
 608         .change_queue_depth     = iscsi_change_queue_depth,
 609         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 610         .max_sectors            = 1024,
 611         .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
 612         .eh_abort_handler       = iscsi_eh_abort,
 613         .eh_device_reset_handler= iscsi_eh_device_reset,
 614         .eh_target_reset_handler = iscsi_eh_recover_target,
 615         .target_alloc           = iscsi_target_alloc,
 616         .use_clustering         = DISABLE_CLUSTERING,
 617         .proc_name              = "iscsi_iser",
 618         .this_id                = -1,
 619 };
 620
 621 static struct iscsi_transport iscsi_iser_transport = {
 622         .owner                  = THIS_MODULE,
 623         .name                   = "iser",
 624         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 625         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 626                                   ISCSI_MAX_XMIT_DLENGTH |
 627                                   ISCSI_HDRDGST_EN |
 628                                   ISCSI_DATADGST_EN |
 629                                   ISCSI_INITIAL_R2T_EN |
 630                                   ISCSI_MAX_R2T |
 631                                   ISCSI_IMM_DATA_EN |
 632                                   ISCSI_FIRST_BURST |
 633                                   ISCSI_MAX_BURST |
 634                                   ISCSI_PDU_INORDER_EN |
 635                                   ISCSI_DATASEQ_INORDER_EN |
 636                                   ISCSI_EXP_STATSN |
 637                                   ISCSI_PERSISTENT_PORT |
 638                                   ISCSI_PERSISTENT_ADDRESS |
 639                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
 640                                   ISCSI_USERNAME | ISCSI_PASSWORD |
 641                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 642                                   ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 643                                   ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
 644                                   ISCSI_PING_TMO | ISCSI_RECV_TMO |
 645                                   ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 646         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 647                                   ISCSI_HOST_NETDEV_NAME |
 648                                   ISCSI_HOST_INITIATOR_NAME,
 649         /* session management */
 650         .create_session         = iscsi_iser_session_create,
 651         .destroy_session        = iscsi_iser_session_destroy,
 652         /* connection management */
 653         .create_conn            = iscsi_iser_conn_create,
 654         .bind_conn              = iscsi_iser_conn_bind,
 655         .destroy_conn           = iscsi_iser_conn_destroy,
 656         .set_param              = iscsi_iser_set_param,
 657         .get_conn_param         = iscsi_conn_get_param,
 658         .get_session_param      = iscsi_session_get_param,
 659         .start_conn             = iscsi_iser_conn_start,
 660         .stop_conn              = iscsi_iser_conn_stop,
 661         /* iscsi host params */
 662         .get_host_param         = iscsi_host_get_param,
 663         .set_host_param         = iscsi_host_set_param,
 664         /* IO */
 665         .send_pdu               = iscsi_conn_send_pdu,
 666         .get_stats              = iscsi_iser_conn_get_stats,
 667         .init_task              = iscsi_iser_task_init,
 668         .xmit_task              = iscsi_iser_task_xmit,
 669         .cleanup_task           = iscsi_iser_cleanup_task,
 670         .alloc_pdu              = iscsi_iser_pdu_alloc,
 671         /* recovery */
 672         .session_recovery_timedout = iscsi_session_recovery_timedout,
 673
 674         .ep_connect             = iscsi_iser_ep_connect,
 675         .ep_poll                = iscsi_iser_ep_poll,
 676         .ep_disconnect          = iscsi_iser_ep_disconnect
 677 };
 678
 679 static int __init iser_init(void)
 680 {
 681         int err;
 682
 683         iser_dbg("Starting iSER datamover...\n");
 684
 685         if (iscsi_max_lun < 1) {
 686                 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
 687                 return -EINVAL;
 688         }
 689
 690         memset(&ig, 0, sizeof(struct iser_global));
 691
 692         ig.desc_cache = kmem_cache_create("iser_descriptors",
 693                                           sizeof(struct iser_tx_desc),
 694                                           0, SLAB_HWCACHE_ALIGN,
 695                                           NULL);
 696         if (ig.desc_cache == NULL)
 697                 return -ENOMEM;
 698
 699         /* device init is called only after the first addr resolution */
 700         mutex_init(&ig.device_list_mutex);
 701         INIT_LIST_HEAD(&ig.device_list);
 702         mutex_init(&ig.connlist_mutex);
 703         INIT_LIST_HEAD(&ig.connlist);
 704
 705         iscsi_iser_scsi_transport = iscsi_register_transport(
 706                                                         &iscsi_iser_transport);
 707         if (!iscsi_iser_scsi_transport) {
 708                 iser_err("iscsi_register_transport failed\n");
 709                 err = -EINVAL;
 710                 goto register_transport_failure;
 711         }
 712
 713         return 0;
 714
 715 register_transport_failure:
 716         kmem_cache_destroy(ig.desc_cache);
 717
 718         return err;
 719 }
 720
 721 static void __exit iser_exit(void)
 722 {
 723         iser_dbg("Removing iSER datamover...\n");
 724         iscsi_unregister_transport(&iscsi_iser_transport);
 725         kmem_cache_destroy(ig.desc_cache);
 726 }
 727
 728 module_init(iser_init);
 729 module_exit(iser_exit);