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         /*
 261          * mgmt tasks do not need special cleanup and we do not
 262          * allocate anything in the init task callout
 263          */
 264         if (!task->sc || task->state == ISCSI_TASK_PENDING)
 265                 return;
 266
 267         if (iser_task->status == ISER_TASK_STATUS_STARTED) {
 268                 iser_task->status = ISER_TASK_STATUS_COMPLETED;
 269                 iser_task_rdma_finalize(iser_task);
 270         }
 271 }
 272
 273 static struct iscsi_cls_conn *
 274 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 275 {
 276         struct iscsi_conn *conn;
 277         struct iscsi_cls_conn *cls_conn;
 278         struct iscsi_iser_conn *iser_conn;
 279
 280         cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
 281         if (!cls_conn)
 282                 return NULL;
 283         conn = cls_conn->dd_data;
 284
 285         /*
 286          * due to issues with the login code re iser sematics
 287          * this not set in iscsi_conn_setup - FIXME
 288          */
 289         conn->max_recv_dlength = 128;
 290
 291         iser_conn = conn->dd_data;
 292         conn->dd_data = iser_conn;
 293         iser_conn->iscsi_conn = conn;
 294
 295         return cls_conn;
 296 }
 297
 298 static void
 299 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 300 {
 301         struct iscsi_conn *conn = cls_conn->dd_data;
 302         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 303         struct iser_conn *ib_conn = iser_conn->ib_conn;
 304
 305         iscsi_conn_teardown(cls_conn);
 306         /*
 307          * Userspace will normally call the stop callback and
 308          * already have freed the ib_conn, but if it goofed up then
 309          * we free it here.
 310          */
 311         if (ib_conn) {
 312                 ib_conn->iser_conn = NULL;
 313                 iser_conn_put(ib_conn);
 314         }
 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         struct iscsi_endpoint *ep;
 326         int error;
 327
 328         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 329         if (error)
 330                 return error;
 331
 332         /* the transport ep handle comes from user space so it must be
 333          * verified against the global ib connections list */
 334         ep = iscsi_lookup_endpoint(transport_eph);
 335         if (!ep) {
 336                 iser_err("can't bind eph %llx\n",
 337                          (unsigned long long)transport_eph);
 338                 return -EINVAL;
 339         }
 340         ib_conn = ep->dd_data;
 341
 342         /* binds the iSER connection retrieved from the previously
 343          * connected ep_handle to the iSCSI layer connection. exchanges
 344          * connection pointers */
 345         iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
 346         iser_conn = conn->dd_data;
 347         ib_conn->iser_conn = iser_conn;
 348         iser_conn->ib_conn  = ib_conn;
 349         iser_conn_get(ib_conn);
 350         return 0;
 351 }
 352
 353 static void
 354 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 355 {
 356         struct iscsi_conn *conn = cls_conn->dd_data;
 357         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 358         struct iser_conn *ib_conn = iser_conn->ib_conn;
 359
 360         /*
 361          * Userspace may have goofed up and not bound the connection or
 362          * might have only partially setup the connection.
 363          */
 364         if (ib_conn) {
 365                 iscsi_conn_stop(cls_conn, flag);
 366                 /*
 367                  * There is no unbind event so the stop callback
 368                  * must release the ref from the bind.
 369                  */
 370                 iser_conn_put(ib_conn);
 371         }
 372         iser_conn->ib_conn = NULL;
 373 }
 374
 375 static int
 376 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 377 {
 378         struct iscsi_conn *conn = cls_conn->dd_data;
 379         int err;
 380
 381         err = iser_conn_set_full_featured_mode(conn);
 382         if (err)
 383                 return err;
 384
 385         return iscsi_conn_start(cls_conn);
 386 }
 387
 388 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 389 {
 390         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 391
 392         iscsi_session_teardown(cls_session);
 393         iscsi_host_remove(shost);
 394         iscsi_host_free(shost);
 395 }
 396
 397 static struct iscsi_cls_session *
 398 iscsi_iser_session_create(struct iscsi_endpoint *ep,
 399                           uint16_t cmds_max, uint16_t qdepth,
 400                           uint32_t initial_cmdsn)
 401 {
 402         struct iscsi_cls_session *cls_session;
 403         struct iscsi_session *session;
 404         struct Scsi_Host *shost;
 405         struct iser_conn *ib_conn;
 406
 407         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1);
 408         if (!shost)
 409                 return NULL;
 410         shost->transportt = iscsi_iser_scsi_transport;
 411         shost->max_lun = iscsi_max_lun;
 412         shost->max_id = 0;
 413         shost->max_channel = 0;
 414         shost->max_cmd_len = 16;
 415
 416         /*
 417          * older userspace tools (before 2.0-870) did not pass us
 418          * the leading conn's ep so this will be NULL;
 419          */
 420         if (ep)
 421                 ib_conn = ep->dd_data;
 422
 423         if (iscsi_host_add(shost,
 424                            ep ? ib_conn->device->ib_device->dma_device : NULL))
 425                 goto free_host;
 426
 427         /*
 428          * we do not support setting can_queue cmd_per_lun from userspace yet
 429          * because we preallocate so many resources
 430          */
 431         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 432                                           ISCSI_DEF_XMIT_CMDS_MAX,
 433                                           sizeof(struct iscsi_iser_task),
 434                                           initial_cmdsn, 0);
 435         if (!cls_session)
 436                 goto remove_host;
 437         session = cls_session->dd_data;
 438
 439         shost->can_queue = session->scsi_cmds_max;
 440         return cls_session;
 441
 442 remove_host:
 443         iscsi_host_remove(shost);
 444 free_host:
 445         iscsi_host_free(shost);
 446         return NULL;
 447 }
 448
 449 static int
 450 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 451                      enum iscsi_param param, char *buf, int buflen)
 452 {
 453         int value;
 454
 455         switch (param) {
 456         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 457                 /* TBD */
 458                 break;
 459         case ISCSI_PARAM_HDRDGST_EN:
 460                 sscanf(buf, "%d", &value);
 461                 if (value) {
 462                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 463                         return -EPROTO;
 464                 }
 465                 break;
 466         case ISCSI_PARAM_DATADGST_EN:
 467                 sscanf(buf, "%d", &value);
 468                 if (value) {
 469                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 470                         return -EPROTO;
 471                 }
 472                 break;
 473         case ISCSI_PARAM_IFMARKER_EN:
 474                 sscanf(buf, "%d", &value);
 475                 if (value) {
 476                         printk(KERN_ERR "IFMarker wasn't negotiated to No");
 477                         return -EPROTO;
 478                 }
 479                 break;
 480         case ISCSI_PARAM_OFMARKER_EN:
 481                 sscanf(buf, "%d", &value);
 482                 if (value) {
 483                         printk(KERN_ERR "OFMarker wasn't negotiated to No");
 484                         return -EPROTO;
 485                 }
 486                 break;
 487         default:
 488                 return iscsi_set_param(cls_conn, param, buf, buflen);
 489         }
 490
 491         return 0;
 492 }
 493
 494 static void
 495 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 496 {
 497         struct iscsi_conn *conn = cls_conn->dd_data;
 498
 499         stats->txdata_octets = conn->txdata_octets;
 500         stats->rxdata_octets = conn->rxdata_octets;
 501         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 502         stats->dataout_pdus = conn->dataout_pdus_cnt;
 503         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 504         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 505         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 506         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 507         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 508         stats->custom_length = 4;
 509         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 510         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 511         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 512         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 513         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 514         stats->custom[2].value = conn->eh_abort_cnt;
 515         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 516         stats->custom[3].value = conn->fmr_unalign_cnt;
 517 }
 518
 519 static struct iscsi_endpoint *
 520 iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking)
 521 {
 522         int err;
 523         struct iser_conn *ib_conn;
 524         struct iscsi_endpoint *ep;
 525
 526         ep = iscsi_create_endpoint(sizeof(*ib_conn));
 527         if (!ep)
 528                 return ERR_PTR(-ENOMEM);
 529
 530         ib_conn = ep->dd_data;
 531         ib_conn->ep = ep;
 532         iser_conn_init(ib_conn);
 533
 534         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
 535                            non_blocking);
 536         if (err) {
 537                 iscsi_destroy_endpoint(ep);
 538                 return ERR_PTR(err);
 539         }
 540         return ep;
 541 }
 542
 543 static int
 544 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 545 {
 546         struct iser_conn *ib_conn;
 547         int rc;
 548
 549         ib_conn = ep->dd_data;
 550         rc = wait_event_interruptible_timeout(ib_conn->wait,
 551                              ib_conn->state == ISER_CONN_UP,
 552                              msecs_to_jiffies(timeout_ms));
 553
 554         /* if conn establishment failed, return error code to iscsi */
 555         if (!rc &&
 556             (ib_conn->state == ISER_CONN_TERMINATING ||
 557              ib_conn->state == ISER_CONN_DOWN))
 558                 rc = -1;
 559
 560         iser_err("ib conn %p rc = %d\n", ib_conn, rc);
 561
 562         if (rc > 0)
 563                 return 1; /* success, this is the equivalent of POLLOUT */
 564         else if (!rc)
 565                 return 0; /* timeout */
 566         else
 567                 return rc; /* signal */
 568 }
 569
 570 static void
 571 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 572 {
 573         struct iser_conn *ib_conn;
 574
 575         ib_conn = ep->dd_data;
 576         if (ib_conn->iser_conn)
 577                 /*
 578                  * Must suspend xmit path if the ep is bound to the
 579                  * iscsi_conn, so we know we are not accessing the ib_conn
 580                  * when we free it.
 581                  *
 582                  * This may not be bound if the ep poll failed.
 583                  */
 584                 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
 585
 586
 587         iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
 588         iser_conn_terminate(ib_conn);
 589 }
 590
 591 static struct scsi_host_template iscsi_iser_sht = {
 592         .module                 = THIS_MODULE,
 593         .name                   = "iSCSI Initiator over iSER, v." DRV_VER,
 594         .queuecommand           = iscsi_queuecommand,
 595         .change_queue_depth     = iscsi_change_queue_depth,
 596         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 597         .max_sectors            = 1024,
 598         .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
 599         .eh_abort_handler       = iscsi_eh_abort,
 600         .eh_device_reset_handler= iscsi_eh_device_reset,
 601         .eh_target_reset_handler= iscsi_eh_target_reset,
 602         .target_alloc           = iscsi_target_alloc,
 603         .use_clustering         = DISABLE_CLUSTERING,
 604         .proc_name              = "iscsi_iser",
 605         .this_id                = -1,
 606 };
 607
 608 static struct iscsi_transport iscsi_iser_transport = {
 609         .owner                  = THIS_MODULE,
 610         .name                   = "iser",
 611         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 612         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 613                                   ISCSI_MAX_XMIT_DLENGTH |
 614                                   ISCSI_HDRDGST_EN |
 615                                   ISCSI_DATADGST_EN |
 616                                   ISCSI_INITIAL_R2T_EN |
 617                                   ISCSI_MAX_R2T |
 618                                   ISCSI_IMM_DATA_EN |
 619                                   ISCSI_FIRST_BURST |
 620                                   ISCSI_MAX_BURST |
 621                                   ISCSI_PDU_INORDER_EN |
 622                                   ISCSI_DATASEQ_INORDER_EN |
 623                                   ISCSI_EXP_STATSN |
 624                                   ISCSI_PERSISTENT_PORT |
 625                                   ISCSI_PERSISTENT_ADDRESS |
 626                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
 627                                   ISCSI_USERNAME | ISCSI_PASSWORD |
 628                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 629                                   ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 630                                   ISCSI_PING_TMO | ISCSI_RECV_TMO |
 631                                   ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 632         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 633                                   ISCSI_HOST_NETDEV_NAME |
 634                                   ISCSI_HOST_INITIATOR_NAME,
 635         /* session management */
 636         .create_session         = iscsi_iser_session_create,
 637         .destroy_session        = iscsi_iser_session_destroy,
 638         /* connection management */
 639         .create_conn            = iscsi_iser_conn_create,
 640         .bind_conn              = iscsi_iser_conn_bind,
 641         .destroy_conn           = iscsi_iser_conn_destroy,
 642         .set_param              = iscsi_iser_set_param,
 643         .get_conn_param         = iscsi_conn_get_param,
 644         .get_session_param      = iscsi_session_get_param,
 645         .start_conn             = iscsi_iser_conn_start,
 646         .stop_conn              = iscsi_iser_conn_stop,
 647         /* iscsi host params */
 648         .get_host_param         = iscsi_host_get_param,
 649         .set_host_param         = iscsi_host_set_param,
 650         /* IO */
 651         .send_pdu               = iscsi_conn_send_pdu,
 652         .get_stats              = iscsi_iser_conn_get_stats,
 653         .init_task              = iscsi_iser_task_init,
 654         .xmit_task              = iscsi_iser_task_xmit,
 655         .cleanup_task           = iscsi_iser_cleanup_task,
 656         .alloc_pdu              = iscsi_iser_pdu_alloc,
 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);