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         uint32_t ret_itt;
 102         int datalen;
 103         int ahslen;
 104
 105         /* verify PDU length */
 106         datalen = ntoh24(hdr->dlength);
 107         if (datalen != rx_data_len) {
 108                 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
 109                        datalen, rx_data_len);
 110                 rc = ISCSI_ERR_DATALEN;
 111                 goto error;
 112         }
 113
 114         /* read AHS */
 115         ahslen = hdr->hlength * 4;
 116
 117         /* verify itt (itt encoding: age+cid+itt) */
 118         rc = iscsi_verify_itt(conn, hdr, &ret_itt);
 119
 120         if (!rc)
 121                 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
 122
 123         if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
 124                 goto error;
 125
 126         return;
 127 error:
 128         iscsi_conn_failure(conn, rc);
 129 }
 130
 131
 132 /**
 133  * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
 134  *
 135  **/
 136 static int
 137 iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
 138 {
 139         struct iscsi_iser_conn     *iser_conn  = ctask->conn->dd_data;
 140         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 141
 142         iser_ctask->command_sent = 0;
 143         iser_ctask->iser_conn    = iser_conn;
 144         iser_ctask_rdma_init(iser_ctask);
 145         return 0;
 146 }
 147
 148 /**
 149  * iscsi_mtask_xmit - xmit management(immediate) task
 150  * @conn: iscsi connection
 151  * @mtask: task management task
 152  *
 153  * Notes:
 154  *      The function can return -EAGAIN in which case caller must
 155  *      call it again later, or recover. '0' return code means successful
 156  *      xmit.
 157  *
 158  **/
 159 static int
 160 iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
 161                       struct iscsi_mgmt_task *mtask)
 162 {
 163         int error = 0;
 164
 165         debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
 166
 167         error = iser_send_control(conn, mtask);
 168
 169         /* since iser xmits control with zero copy, mtasks can not be recycled
 170          * right after sending them.
 171          * The recycling scheme is based on whether a response is expected
 172          * - if yes, the mtask is recycled at iscsi_complete_pdu
 173          * - if no,  the mtask is recycled at iser_snd_completion
 174          */
 175         if (error && error != -ENOBUFS)
 176                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 177
 178         return error;
 179 }
 180
 181 static int
 182 iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
 183                                  struct iscsi_cmd_task *ctask)
 184 {
 185         struct iscsi_data  hdr;
 186         int error = 0;
 187
 188         /* Send data-out PDUs while there's still unsolicited data to send */
 189         while (ctask->unsol_count > 0) {
 190                 iscsi_prep_unsolicit_data_pdu(ctask, &hdr);
 191                 debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
 192                            hdr.itt, ctask->data_count);
 193
 194                 /* the buffer description has been passed with the command */
 195                 /* Send the command */
 196                 error = iser_send_data_out(conn, ctask, &hdr);
 197                 if (error) {
 198                         ctask->unsol_datasn--;
 199                         goto iscsi_iser_ctask_xmit_unsol_data_exit;
 200                 }
 201                 ctask->unsol_count -= ctask->data_count;
 202                 debug_scsi("Need to send %d more as data-out PDUs\n",
 203                            ctask->unsol_count);
 204         }
 205
 206 iscsi_iser_ctask_xmit_unsol_data_exit:
 207         return error;
 208 }
 209
 210 static int
 211 iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
 212                       struct iscsi_cmd_task *ctask)
 213 {
 214         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 215         int error = 0;
 216
 217         if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) {
 218                 BUG_ON(scsi_bufflen(ctask->sc) == 0);
 219
 220                 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
 221                            ctask->itt, scsi_bufflen(ctask->sc),
 222                            ctask->imm_count, ctask->unsol_count);
 223         }
 224
 225         debug_scsi("ctask deq [cid %d itt 0x%x]\n",
 226                    conn->id, ctask->itt);
 227
 228         /* Send the cmd PDU */
 229         if (!iser_ctask->command_sent) {
 230                 error = iser_send_command(conn, ctask);
 231                 if (error)
 232                         goto iscsi_iser_ctask_xmit_exit;
 233                 iser_ctask->command_sent = 1;
 234         }
 235
 236         /* Send unsolicited data-out PDU(s) if necessary */
 237         if (ctask->unsol_count)
 238                 error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
 239
 240  iscsi_iser_ctask_xmit_exit:
 241         if (error && error != -ENOBUFS)
 242                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 243         return error;
 244 }
 245
 246 static void
 247 iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
 248 {
 249         struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
 250
 251         if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
 252                 iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
 253                 iser_ctask_rdma_finalize(iser_ctask);
 254         }
 255 }
 256
 257 static struct iser_conn *
 258 iscsi_iser_ib_conn_lookup(__u64 ep_handle)
 259 {
 260         struct iser_conn *ib_conn;
 261         struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
 262
 263         mutex_lock(&ig.connlist_mutex);
 264         list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
 265                 if (ib_conn == uib_conn) {
 266                         mutex_unlock(&ig.connlist_mutex);
 267                         return ib_conn;
 268                 }
 269         }
 270         mutex_unlock(&ig.connlist_mutex);
 271         iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
 272         return NULL;
 273 }
 274
 275 static struct iscsi_cls_conn *
 276 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 277 {
 278         struct iscsi_conn *conn;
 279         struct iscsi_cls_conn *cls_conn;
 280         struct iscsi_iser_conn *iser_conn;
 281
 282         cls_conn = iscsi_conn_setup(cls_session, conn_idx);
 283         if (!cls_conn)
 284                 return NULL;
 285         conn = cls_conn->dd_data;
 286
 287         /*
 288          * due to issues with the login code re iser sematics
 289          * this not set in iscsi_conn_setup - FIXME
 290          */
 291         conn->max_recv_dlength = 128;
 292
 293         iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
 294         if (!iser_conn)
 295                 goto conn_alloc_fail;
 296
 297         /* currently this is the only field which need to be initiated */
 298         rwlock_init(&iser_conn->lock);
 299
 300         conn->dd_data = iser_conn;
 301         iser_conn->iscsi_conn = conn;
 302
 303         return cls_conn;
 304
 305 conn_alloc_fail:
 306         iscsi_conn_teardown(cls_conn);
 307         return NULL;
 308 }
 309
 310 static void
 311 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 312 {
 313         struct iscsi_conn *conn = cls_conn->dd_data;
 314         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 315
 316         iscsi_conn_teardown(cls_conn);
 317         if (iser_conn->ib_conn)
 318                 iser_conn->ib_conn->iser_conn = NULL;
 319         kfree(iser_conn);
 320 }
 321
 322 static int
 323 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 324                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 325                      int is_leading)
 326 {
 327         struct iscsi_conn *conn = cls_conn->dd_data;
 328         struct iscsi_iser_conn *iser_conn;
 329         struct iser_conn *ib_conn;
 330         int error;
 331
 332         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 333         if (error)
 334                 return error;
 335
 336         /* the transport ep handle comes from user space so it must be
 337          * verified against the global ib connections list */
 338         ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
 339         if (!ib_conn) {
 340                 iser_err("can't bind eph %llx\n",
 341                          (unsigned long long)transport_eph);
 342                 return -EINVAL;
 343         }
 344         /* binds the iSER connection retrieved from the previously
 345          * connected ep_handle to the iSCSI layer connection. exchanges
 346          * connection pointers */
 347         iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
 348         iser_conn = conn->dd_data;
 349         ib_conn->iser_conn = iser_conn;
 350         iser_conn->ib_conn  = ib_conn;
 351
 352         conn->recv_lock = &iser_conn->lock;
 353
 354         return 0;
 355 }
 356
 357 static int
 358 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 359 {
 360         struct iscsi_conn *conn = cls_conn->dd_data;
 361         int err;
 362
 363         err = iser_conn_set_full_featured_mode(conn);
 364         if (err)
 365                 return err;
 366
 367         return iscsi_conn_start(cls_conn);
 368 }
 369
 370 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 371 {
 372         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 373
 374         iscsi_host_remove(shost);
 375         iscsi_host_free(shost);
 376 }
 377
 378 static struct iscsi_cls_session *
 379 iscsi_iser_session_create(struct Scsi_Host *shost,
 380                           uint16_t cmds_max, uint16_t qdepth,
 381                           uint32_t initial_cmdsn, uint32_t *hostno)
 382 {
 383         struct iscsi_cls_session *cls_session;
 384         struct iscsi_session *session;
 385         int i;
 386         struct iscsi_cmd_task  *ctask;
 387         struct iscsi_mgmt_task *mtask;
 388         struct iscsi_iser_cmd_task *iser_ctask;
 389         struct iser_desc *desc;
 390
 391         if (shost) {
 392                 printk(KERN_ERR "iscsi_tcp: invalid shost %d.\n",
 393                        shost->host_no);
 394                 return NULL;
 395         }
 396
 397         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN);
 398         if (!shost)
 399                 return NULL;
 400         shost->transportt = iscsi_iser_scsi_transport;
 401         shost->max_lun = iscsi_max_lun;
 402         shost->max_id = 0;
 403         shost->max_channel = 0;
 404         shost->max_cmd_len = 16;
 405
 406         if (iscsi_host_add(shost, NULL))
 407                 goto free_host;
 408         *hostno = shost->host_no;
 409
 410         /*
 411          * we do not support setting can_queue cmd_per_lun from userspace yet
 412          * because we preallocate so many resources
 413          */
 414         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 415                                           ISCSI_DEF_XMIT_CMDS_MAX,
 416                                           sizeof(struct iscsi_iser_cmd_task),
 417                                           sizeof(struct iser_desc),
 418                                           initial_cmdsn);
 419         if (!cls_session)
 420                 goto remove_host;
 421         session = cls_session->dd_data;
 422
 423         shost->can_queue = session->cmds_max;
 424         /* libiscsi setup itts, data and pool so just set desc fields */
 425         for (i = 0; i < session->cmds_max; i++) {
 426                 ctask      = session->cmds[i];
 427                 iser_ctask = ctask->dd_data;
 428                 ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
 429                 ctask->hdr_max = sizeof(iser_ctask->desc.iscsi_header);
 430         }
 431
 432         for (i = 0; i < session->mgmtpool_max; i++) {
 433                 mtask      = session->mgmt_cmds[i];
 434                 desc       = mtask->dd_data;
 435                 mtask->hdr = &desc->iscsi_header;
 436                 desc->data = mtask->data;
 437         }
 438
 439         return cls_session;
 440
 441 remove_host:
 442         iscsi_host_remove(shost);
 443 free_host:
 444         iscsi_host_free(shost);
 445         return NULL;
 446 }
 447
 448 static int
 449 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 450                      enum iscsi_param param, char *buf, int buflen)
 451 {
 452         int value;
 453
 454         switch (param) {
 455         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 456                 /* TBD */
 457                 break;
 458         case ISCSI_PARAM_HDRDGST_EN:
 459                 sscanf(buf, "%d", &value);
 460                 if (value) {
 461                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 462                         return -EPROTO;
 463                 }
 464                 break;
 465         case ISCSI_PARAM_DATADGST_EN:
 466                 sscanf(buf, "%d", &value);
 467                 if (value) {
 468                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 469                         return -EPROTO;
 470                 }
 471                 break;
 472         case ISCSI_PARAM_IFMARKER_EN:
 473                 sscanf(buf, "%d", &value);
 474                 if (value) {
 475                         printk(KERN_ERR "IFMarker wasn't negotiated to No");
 476                         return -EPROTO;
 477                 }
 478                 break;
 479         case ISCSI_PARAM_OFMARKER_EN:
 480                 sscanf(buf, "%d", &value);
 481                 if (value) {
 482                         printk(KERN_ERR "OFMarker wasn't negotiated to No");
 483                         return -EPROTO;
 484                 }
 485                 break;
 486         default:
 487                 return iscsi_set_param(cls_conn, param, buf, buflen);
 488         }
 489
 490         return 0;
 491 }
 492
 493 static void
 494 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 495 {
 496         struct iscsi_conn *conn = cls_conn->dd_data;
 497
 498         stats->txdata_octets = conn->txdata_octets;
 499         stats->rxdata_octets = conn->rxdata_octets;
 500         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 501         stats->dataout_pdus = conn->dataout_pdus_cnt;
 502         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 503         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 504         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 505         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 506         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 507         stats->custom_length = 4;
 508         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 509         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 510         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 511         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 512         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 513         stats->custom[2].value = conn->eh_abort_cnt;
 514         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 515         stats->custom[3].value = conn->fmr_unalign_cnt;
 516 }
 517
 518 static int
 519 iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
 520                       __u64 *ep_handle)
 521 {
 522         int err;
 523         struct iser_conn *ib_conn;
 524
 525         err = iser_conn_init(&ib_conn);
 526         if (err)
 527                 goto out;
 528
 529         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
 530         if (!err)
 531                 *ep_handle = (__u64)(unsigned long)ib_conn;
 532
 533 out:
 534         return err;
 535 }
 536
 537 static int
 538 iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
 539 {
 540         struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
 541         int rc;
 542
 543         if (!ib_conn)
 544                 return -EINVAL;
 545
 546         rc = wait_event_interruptible_timeout(ib_conn->wait,
 547                              ib_conn->state == ISER_CONN_UP,
 548                              msecs_to_jiffies(timeout_ms));
 549
 550         /* if conn establishment failed, return error code to iscsi */
 551         if (!rc &&
 552             (ib_conn->state == ISER_CONN_TERMINATING ||
 553              ib_conn->state == ISER_CONN_DOWN))
 554                 rc = -1;
 555
 556         iser_err("ib conn %p rc = %d\n", ib_conn, rc);
 557
 558         if (rc > 0)
 559                 return 1; /* success, this is the equivalent of POLLOUT */
 560         else if (!rc)
 561                 return 0; /* timeout */
 562         else
 563                 return rc; /* signal */
 564 }
 565
 566 static void
 567 iscsi_iser_ep_disconnect(__u64 ep_handle)
 568 {
 569         struct iser_conn *ib_conn;
 570
 571         ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
 572         if (!ib_conn)
 573                 return;
 574
 575         iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
 576         iser_conn_terminate(ib_conn);
 577 }
 578
 579 static struct scsi_host_template iscsi_iser_sht = {
 580         .module                 = THIS_MODULE,
 581         .name                   = "iSCSI Initiator over iSER, v." DRV_VER,
 582         .queuecommand           = iscsi_queuecommand,
 583         .change_queue_depth     = iscsi_change_queue_depth,
 584         .can_queue              = ISCSI_DEF_XMIT_CMDS_MAX - 1,
 585         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 586         .max_sectors            = 1024,
 587         .cmd_per_lun            = ISCSI_MAX_CMD_PER_LUN,
 588         .eh_abort_handler       = iscsi_eh_abort,
 589         .eh_device_reset_handler= iscsi_eh_device_reset,
 590         .eh_host_reset_handler  = iscsi_eh_host_reset,
 591         .use_clustering         = DISABLE_CLUSTERING,
 592         .proc_name              = "iscsi_iser",
 593         .this_id                = -1,
 594 };
 595
 596 static struct iscsi_transport iscsi_iser_transport = {
 597         .owner                  = THIS_MODULE,
 598         .name                   = "iser",
 599         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 600         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 601                                   ISCSI_MAX_XMIT_DLENGTH |
 602                                   ISCSI_HDRDGST_EN |
 603                                   ISCSI_DATADGST_EN |
 604                                   ISCSI_INITIAL_R2T_EN |
 605                                   ISCSI_MAX_R2T |
 606                                   ISCSI_IMM_DATA_EN |
 607                                   ISCSI_FIRST_BURST |
 608                                   ISCSI_MAX_BURST |
 609                                   ISCSI_PDU_INORDER_EN |
 610                                   ISCSI_DATASEQ_INORDER_EN |
 611                                   ISCSI_EXP_STATSN |
 612                                   ISCSI_PERSISTENT_PORT |
 613                                   ISCSI_PERSISTENT_ADDRESS |
 614                                   ISCSI_TARGET_NAME | ISCSI_TPGT |
 615                                   ISCSI_USERNAME | ISCSI_PASSWORD |
 616                                   ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 617                                   ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 618                                   ISCSI_PING_TMO | ISCSI_RECV_TMO,
 619         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 620                                   ISCSI_HOST_NETDEV_NAME |
 621                                   ISCSI_HOST_INITIATOR_NAME,
 622         .conndata_size          = sizeof(struct iscsi_conn),
 623         .sessiondata_size       = sizeof(struct iscsi_session),
 624         /* session management */
 625         .create_session         = iscsi_iser_session_create,
 626         .destroy_session        = iscsi_iser_session_destroy,
 627         /* connection management */
 628         .create_conn            = iscsi_iser_conn_create,
 629         .bind_conn              = iscsi_iser_conn_bind,
 630         .destroy_conn           = iscsi_iser_conn_destroy,
 631         .set_param              = iscsi_iser_set_param,
 632         .get_conn_param         = iscsi_conn_get_param,
 633         .get_session_param      = iscsi_session_get_param,
 634         .start_conn             = iscsi_iser_conn_start,
 635         .stop_conn              = iscsi_conn_stop,
 636         /* iscsi host params */
 637         .get_host_param         = iscsi_host_get_param,
 638         .set_host_param         = iscsi_host_set_param,
 639         /* IO */
 640         .send_pdu               = iscsi_conn_send_pdu,
 641         .get_stats              = iscsi_iser_conn_get_stats,
 642         .init_cmd_task          = iscsi_iser_cmd_init,
 643         .xmit_cmd_task          = iscsi_iser_ctask_xmit,
 644         .xmit_mgmt_task         = iscsi_iser_mtask_xmit,
 645         .cleanup_cmd_task       = iscsi_iser_cleanup_ctask,
 646         /* recovery */
 647         .session_recovery_timedout = iscsi_session_recovery_timedout,
 648
 649         .ep_connect             = iscsi_iser_ep_connect,
 650         .ep_poll                = iscsi_iser_ep_poll,
 651         .ep_disconnect          = iscsi_iser_ep_disconnect
 652 };
 653
 654 static int __init iser_init(void)
 655 {
 656         int err;
 657
 658         iser_dbg("Starting iSER datamover...\n");
 659
 660         if (iscsi_max_lun < 1) {
 661                 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
 662                 return -EINVAL;
 663         }
 664
 665         memset(&ig, 0, sizeof(struct iser_global));
 666
 667         ig.desc_cache = kmem_cache_create("iser_descriptors",
 668                                           sizeof (struct iser_desc),
 669                                           0, SLAB_HWCACHE_ALIGN,
 670                                           NULL);
 671         if (ig.desc_cache == NULL)
 672                 return -ENOMEM;
 673
 674         /* device init is called only after the first addr resolution */
 675         mutex_init(&ig.device_list_mutex);
 676         INIT_LIST_HEAD(&ig.device_list);
 677         mutex_init(&ig.connlist_mutex);
 678         INIT_LIST_HEAD(&ig.connlist);
 679
 680         iscsi_iser_scsi_transport = iscsi_register_transport(
 681                                                         &iscsi_iser_transport);
 682         if (!iscsi_iser_scsi_transport) {
 683                 iser_err("iscsi_register_transport failed\n");
 684                 err = -EINVAL;
 685                 goto register_transport_failure;
 686         }
 687
 688         return 0;
 689
 690 register_transport_failure:
 691         kmem_cache_destroy(ig.desc_cache);
 692
 693         return err;
 694 }
 695
 696 static void __exit iser_exit(void)
 697 {
 698         iser_dbg("Removing iSER datamover...\n");
 699         iscsi_unregister_transport(&iscsi_iser_transport);
 700         kmem_cache_destroy(ig.desc_cache);
 701 }
 702
 703 module_init(iser_init);
 704 module_exit(iser_exit);