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