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