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  * Copyright (c) 2013 Mellanox Technologies. All rights reserved.
   9  * maintained by openib-general@openib.org
  10  *
  11  * This software is available to you under a choice of one of two
  12  * licenses.  You may choose to be licensed under the terms of the GNU
  13  * General Public License (GPL) Version 2, available from the file
  14  * COPYING in the main directory of this source tree, or the
  15  * OpenIB.org BSD license below:
  16  *
  17  *     Redistribution and use in source and binary forms, with or
  18  *     without modification, are permitted provided that the following
  19  *     conditions are met:
  20  *
  21  *      - Redistributions of source code must retain the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer.
  24  *
  25  *      - Redistributions in binary form must reproduce the above
  26  *        copyright notice, this list of conditions and the following
  27  *        disclaimer in the documentation and/or other materials
  28  *        provided with the distribution.
  29  *
  30  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  31  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  32  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  33  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  34  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  35  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  36  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  37  * SOFTWARE.
  38  *
  39  * Credits:
  40  *      Christoph Hellwig
  41  *      FUJITA Tomonori
  42  *      Arne Redlich
  43  *      Zhenyu Wang
  44  * Modified by:
  45  *      Erez Zilber
  46  */
  47
  48 #include <linux/types.h>
  49 #include <linux/list.h>
  50 #include <linux/hardirq.h>
  51 #include <linux/kfifo.h>
  52 #include <linux/blkdev.h>
  53 #include <linux/init.h>
  54 #include <linux/ioctl.h>
  55 #include <linux/cdev.h>
  56 #include <linux/in.h>
  57 #include <linux/net.h>
  58 #include <linux/scatterlist.h>
  59 #include <linux/delay.h>
  60 #include <linux/slab.h>
  61 #include <linux/module.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 MODULE_LICENSE("Dual BSD/GPL");
  88 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
  89 MODULE_VERSION(DRV_VER);
  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 || (datalen + 4) < rx_data_len) {
 107                 iser_err("wrong datalen %d (hdr), %d (IB)\n",
 108                         datalen, rx_data_len);
 109                 rc = ISCSI_ERR_DATALEN;
 110                 goto error;
 111         }
 112
 113         if (datalen != rx_data_len)
 114                 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
 115                         datalen, rx_data_len);
 116
 117         /* read AHS */
 118         ahslen = hdr->hlength * 4;
 119
 120         rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
 121         if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
 122                 goto error;
 123
 124         return;
 125 error:
 126         iscsi_conn_failure(conn, rc);
 127 }
 128
 129 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
 130 {
 131         struct iscsi_iser_task *iser_task = task->dd_data;
 132
 133         task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
 134         task->hdr_max = sizeof(iser_task->desc.iscsi_header);
 135         return 0;
 136 }
 137
 138 int iser_initialize_task_headers(struct iscsi_task *task,
 139                                                 struct iser_tx_desc *tx_desc)
 140 {
 141         struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
 142         struct iser_device     *device    = iser_conn->ib_conn->device;
 143         struct iscsi_iser_task *iser_task = task->dd_data;
 144         u64 dma_addr;
 145
 146         dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
 147                                 ISER_HEADERS_LEN, DMA_TO_DEVICE);
 148         if (ib_dma_mapping_error(device->ib_device, dma_addr))
 149                 return -ENOMEM;
 150
 151         tx_desc->dma_addr = dma_addr;
 152         tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;
 153         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 154         tx_desc->tx_sg[0].lkey   = device->mr->lkey;
 155
 156         iser_task->iser_conn            = iser_conn;
 157         return 0;
 158 }
 159 /**
 160  * iscsi_iser_task_init - Initialize task
 161  * @task: iscsi task
 162  *
 163  * Initialize the task for the scsi command or mgmt command.
 164  */
 165 static int
 166 iscsi_iser_task_init(struct iscsi_task *task)
 167 {
 168         struct iscsi_iser_task *iser_task = task->dd_data;
 169
 170         if (iser_initialize_task_headers(task, &iser_task->desc))
 171                         return -ENOMEM;
 172
 173         /* mgmt task */
 174         if (!task->sc)
 175                 return 0;
 176
 177         iser_task->command_sent = 0;
 178         iser_task_rdma_init(iser_task);
 179         return 0;
 180 }
 181
 182 /**
 183  * iscsi_iser_mtask_xmit - xmit management(immediate) task
 184  * @conn: iscsi connection
 185  * @task: task management task
 186  *
 187  * Notes:
 188  *      The function can return -EAGAIN in which case caller must
 189  *      call it again later, or recover. '0' return code means successful
 190  *      xmit.
 191  *
 192  **/
 193 static int
 194 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
 195 {
 196         int error = 0;
 197
 198         iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
 199
 200         error = iser_send_control(conn, task);
 201
 202         /* since iser xmits control with zero copy, tasks can not be recycled
 203          * right after sending them.
 204          * The recycling scheme is based on whether a response is expected
 205          * - if yes, the task is recycled at iscsi_complete_pdu
 206          * - if no,  the task is recycled at iser_snd_completion
 207          */
 208         return error;
 209 }
 210
 211 static int
 212 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
 213                                  struct iscsi_task *task)
 214 {
 215         struct iscsi_r2t_info *r2t = &task->unsol_r2t;
 216         struct iscsi_data hdr;
 217         int error = 0;
 218
 219         /* Send data-out PDUs while there's still unsolicited data to send */
 220         while (iscsi_task_has_unsol_data(task)) {
 221                 iscsi_prep_data_out_pdu(task, r2t, &hdr);
 222                 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
 223                            hdr.itt, r2t->data_count);
 224
 225                 /* the buffer description has been passed with the command */
 226                 /* Send the command */
 227                 error = iser_send_data_out(conn, task, &hdr);
 228                 if (error) {
 229                         r2t->datasn--;
 230                         goto iscsi_iser_task_xmit_unsol_data_exit;
 231                 }
 232                 r2t->sent += r2t->data_count;
 233                 iser_dbg("Need to send %d more as data-out PDUs\n",
 234                            r2t->data_length - r2t->sent);
 235         }
 236
 237 iscsi_iser_task_xmit_unsol_data_exit:
 238         return error;
 239 }
 240
 241 static int
 242 iscsi_iser_task_xmit(struct iscsi_task *task)
 243 {
 244         struct iscsi_conn *conn = task->conn;
 245         struct iscsi_iser_task *iser_task = task->dd_data;
 246         int error = 0;
 247
 248         if (!task->sc)
 249                 return iscsi_iser_mtask_xmit(conn, task);
 250
 251         if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
 252                 BUG_ON(scsi_bufflen(task->sc) == 0);
 253
 254                 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
 255                            task->itt, scsi_bufflen(task->sc),
 256                            task->imm_count, task->unsol_r2t.data_length);
 257         }
 258
 259         iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
 260                    conn->id, task->itt);
 261
 262         /* Send the cmd PDU */
 263         if (!iser_task->command_sent) {
 264                 error = iser_send_command(conn, task);
 265                 if (error)
 266                         goto iscsi_iser_task_xmit_exit;
 267                 iser_task->command_sent = 1;
 268         }
 269
 270         /* Send unsolicited data-out PDU(s) if necessary */
 271         if (iscsi_task_has_unsol_data(task))
 272                 error = iscsi_iser_task_xmit_unsol_data(conn, task);
 273
 274  iscsi_iser_task_xmit_exit:
 275         return error;
 276 }
 277
 278 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
 279 {
 280         struct iscsi_iser_task *iser_task = task->dd_data;
 281         struct iser_tx_desc     *tx_desc = &iser_task->desc;
 282
 283         struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
 284         struct iser_device     *device    = iser_conn->ib_conn->device;
 285
 286         ib_dma_unmap_single(device->ib_device,
 287                 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
 288
 289         /* mgmt tasks do not need special cleanup */
 290         if (!task->sc)
 291                 return;
 292
 293         if (iser_task->status == ISER_TASK_STATUS_STARTED) {
 294                 iser_task->status = ISER_TASK_STATUS_COMPLETED;
 295                 iser_task_rdma_finalize(iser_task);
 296         }
 297 }
 298
 299 static struct iscsi_cls_conn *
 300 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 301 {
 302         struct iscsi_conn *conn;
 303         struct iscsi_cls_conn *cls_conn;
 304         struct iscsi_iser_conn *iser_conn;
 305
 306         cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
 307         if (!cls_conn)
 308                 return NULL;
 309         conn = cls_conn->dd_data;
 310
 311         /*
 312          * due to issues with the login code re iser sematics
 313          * this not set in iscsi_conn_setup - FIXME
 314          */
 315         conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
 316
 317         iser_conn = conn->dd_data;
 318         conn->dd_data = iser_conn;
 319         iser_conn->iscsi_conn = conn;
 320
 321         return cls_conn;
 322 }
 323
 324 static void
 325 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 326 {
 327         struct iscsi_conn *conn = cls_conn->dd_data;
 328         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 329         struct iser_conn *ib_conn = iser_conn->ib_conn;
 330
 331         iscsi_conn_teardown(cls_conn);
 332         /*
 333          * Userspace will normally call the stop callback and
 334          * already have freed the ib_conn, but if it goofed up then
 335          * we free it here.
 336          */
 337         if (ib_conn) {
 338                 ib_conn->iser_conn = NULL;
 339                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 340         }
 341 }
 342
 343 static int
 344 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 345                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 346                      int is_leading)
 347 {
 348         struct iscsi_conn *conn = cls_conn->dd_data;
 349         struct iscsi_iser_conn *iser_conn;
 350         struct iser_conn *ib_conn;
 351         struct iscsi_endpoint *ep;
 352         int error;
 353
 354         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 355         if (error)
 356                 return error;
 357
 358         /* the transport ep handle comes from user space so it must be
 359          * verified against the global ib connections list */
 360         ep = iscsi_lookup_endpoint(transport_eph);
 361         if (!ep) {
 362                 iser_err("can't bind eph %llx\n",
 363                          (unsigned long long)transport_eph);
 364                 return -EINVAL;
 365         }
 366         ib_conn = ep->dd_data;
 367
 368         if (iser_alloc_rx_descriptors(ib_conn))
 369                 return -ENOMEM;
 370
 371         /* binds the iSER connection retrieved from the previously
 372          * connected ep_handle to the iSCSI layer connection. exchanges
 373          * connection pointers */
 374         iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n",
 375                   conn, conn->dd_data, ib_conn);
 376         iser_conn = conn->dd_data;
 377         ib_conn->iser_conn = iser_conn;
 378         iser_conn->ib_conn  = ib_conn;
 379         iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
 380         return 0;
 381 }
 382
 383 static void
 384 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 385 {
 386         struct iscsi_conn *conn = cls_conn->dd_data;
 387         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 388         struct iser_conn *ib_conn = iser_conn->ib_conn;
 389
 390         /*
 391          * Userspace may have goofed up and not bound the connection or
 392          * might have only partially setup the connection.
 393          */
 394         if (ib_conn) {
 395                 iscsi_conn_stop(cls_conn, flag);
 396                 /*
 397                  * There is no unbind event so the stop callback
 398                  * must release the ref from the bind.
 399                  */
 400                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 401         }
 402         iser_conn->ib_conn = NULL;
 403 }
 404
 405 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 406 {
 407         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 408
 409         iscsi_session_teardown(cls_session);
 410         iscsi_host_remove(shost);
 411         iscsi_host_free(shost);
 412 }
 413
 414 static struct iscsi_cls_session *
 415 iscsi_iser_session_create(struct iscsi_endpoint *ep,
 416                           uint16_t cmds_max, uint16_t qdepth,
 417                           uint32_t initial_cmdsn)
 418 {
 419         struct iscsi_cls_session *cls_session;
 420         struct iscsi_session *session;
 421         struct Scsi_Host *shost;
 422         struct iser_conn *ib_conn;
 423
 424         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
 425         if (!shost)
 426                 return NULL;
 427         shost->transportt = iscsi_iser_scsi_transport;
 428         shost->max_lun = iscsi_max_lun;
 429         shost->max_id = 0;
 430         shost->max_channel = 0;
 431         shost->max_cmd_len = 16;
 432
 433         /*
 434          * older userspace tools (before 2.0-870) did not pass us
 435          * the leading conn's ep so this will be NULL;
 436          */
 437         if (ep)
 438                 ib_conn = ep->dd_data;
 439
 440         if (iscsi_host_add(shost,
 441                            ep ? ib_conn->device->ib_device->dma_device : NULL))
 442                 goto free_host;
 443
 444         /*
 445          * we do not support setting can_queue cmd_per_lun from userspace yet
 446          * because we preallocate so many resources
 447          */
 448         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 449                                           ISCSI_DEF_XMIT_CMDS_MAX, 0,
 450                                           sizeof(struct iscsi_iser_task),
 451                                           initial_cmdsn, 0);
 452         if (!cls_session)
 453                 goto remove_host;
 454         session = cls_session->dd_data;
 455
 456         shost->can_queue = session->scsi_cmds_max;
 457         return cls_session;
 458
 459 remove_host:
 460         iscsi_host_remove(shost);
 461 free_host:
 462         iscsi_host_free(shost);
 463         return NULL;
 464 }
 465
 466 static int
 467 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 468                      enum iscsi_param param, char *buf, int buflen)
 469 {
 470         int value;
 471
 472         switch (param) {
 473         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 474                 /* TBD */
 475                 break;
 476         case ISCSI_PARAM_HDRDGST_EN:
 477                 sscanf(buf, "%d", &value);
 478                 if (value) {
 479                         iser_err("DataDigest wasn't negotiated to None");
 480                         return -EPROTO;
 481                 }
 482                 break;
 483         case ISCSI_PARAM_DATADGST_EN:
 484                 sscanf(buf, "%d", &value);
 485                 if (value) {
 486                         iser_err("DataDigest wasn't negotiated to None");
 487                         return -EPROTO;
 488                 }
 489                 break;
 490         case ISCSI_PARAM_IFMARKER_EN:
 491                 sscanf(buf, "%d", &value);
 492                 if (value) {
 493                         iser_err("IFMarker wasn't negotiated to No");
 494                         return -EPROTO;
 495                 }
 496                 break;
 497         case ISCSI_PARAM_OFMARKER_EN:
 498                 sscanf(buf, "%d", &value);
 499                 if (value) {
 500                         iser_err("OFMarker wasn't negotiated to No");
 501                         return -EPROTO;
 502                 }
 503                 break;
 504         default:
 505                 return iscsi_set_param(cls_conn, param, buf, buflen);
 506         }
 507
 508         return 0;
 509 }
 510
 511 static void
 512 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 513 {
 514         struct iscsi_conn *conn = cls_conn->dd_data;
 515
 516         stats->txdata_octets = conn->txdata_octets;
 517         stats->rxdata_octets = conn->rxdata_octets;
 518         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 519         stats->dataout_pdus = conn->dataout_pdus_cnt;
 520         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 521         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 522         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 523         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 524         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 525         stats->custom_length = 4;
 526         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 527         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 528         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 529         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 530         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 531         stats->custom[2].value = conn->eh_abort_cnt;
 532         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 533         stats->custom[3].value = conn->fmr_unalign_cnt;
 534 }
 535
 536 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
 537                                    enum iscsi_param param, char *buf)
 538 {
 539         struct iser_conn *ib_conn = ep->dd_data;
 540         int len;
 541
 542         switch (param) {
 543         case ISCSI_PARAM_CONN_PORT:
 544         case ISCSI_PARAM_CONN_ADDRESS:
 545                 if (!ib_conn || !ib_conn->cma_id)
 546                         return -ENOTCONN;
 547
 548                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
 549                                         &ib_conn->cma_id->route.addr.dst_addr,
 550                                         param, buf);
 551                 break;
 552         default:
 553                 return -ENOSYS;
 554         }
 555
 556         return len;
 557 }
 558
 559 static struct iscsi_endpoint *
 560 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
 561                       int non_blocking)
 562 {
 563         int err;
 564         struct iser_conn *ib_conn;
 565         struct iscsi_endpoint *ep;
 566
 567         ep = iscsi_create_endpoint(sizeof(*ib_conn));
 568         if (!ep)
 569                 return ERR_PTR(-ENOMEM);
 570
 571         ib_conn = ep->dd_data;
 572         ib_conn->ep = ep;
 573         iser_conn_init(ib_conn);
 574
 575         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
 576                            non_blocking);
 577         if (err)
 578                 return ERR_PTR(err);
 579
 580         return ep;
 581 }
 582
 583 static int
 584 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 585 {
 586         struct iser_conn *ib_conn;
 587         int rc;
 588
 589         ib_conn = ep->dd_data;
 590         rc = wait_event_interruptible_timeout(ib_conn->wait,
 591                              ib_conn->state == ISER_CONN_UP,
 592                              msecs_to_jiffies(timeout_ms));
 593
 594         /* if conn establishment failed, return error code to iscsi */
 595         if (!rc &&
 596             (ib_conn->state == ISER_CONN_TERMINATING ||
 597              ib_conn->state == ISER_CONN_DOWN))
 598                 rc = -1;
 599
 600         iser_info("ib conn %p rc = %d\n", ib_conn, rc);
 601
 602         if (rc > 0)
 603                 return 1; /* success, this is the equivalent of POLLOUT */
 604         else if (!rc)
 605                 return 0; /* timeout */
 606         else
 607                 return rc; /* signal */
 608 }
 609
 610 static void
 611 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 612 {
 613         struct iser_conn *ib_conn;
 614
 615         ib_conn = ep->dd_data;
 616         if (ib_conn->iser_conn)
 617                 /*
 618                  * Must suspend xmit path if the ep is bound to the
 619                  * iscsi_conn, so we know we are not accessing the ib_conn
 620                  * when we free it.
 621                  *
 622                  * This may not be bound if the ep poll failed.
 623                  */
 624                 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
 625
 626
 627         iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state);
 628         iser_conn_terminate(ib_conn);
 629 }
 630
 631 static umode_t iser_attr_is_visible(int param_type, int param)
 632 {
 633         switch (param_type) {
 634         case ISCSI_HOST_PARAM:
 635                 switch (param) {
 636                 case ISCSI_HOST_PARAM_NETDEV_NAME:
 637                 case ISCSI_HOST_PARAM_HWADDRESS:
 638                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
 639                         return S_IRUGO;
 640                 default:
 641                         return 0;
 642                 }
 643         case ISCSI_PARAM:
 644                 switch (param) {
 645                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
 646                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 647                 case ISCSI_PARAM_HDRDGST_EN:
 648                 case ISCSI_PARAM_DATADGST_EN:
 649                 case ISCSI_PARAM_CONN_ADDRESS:
 650                 case ISCSI_PARAM_CONN_PORT:
 651                 case ISCSI_PARAM_EXP_STATSN:
 652                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
 653                 case ISCSI_PARAM_PERSISTENT_PORT:
 654                 case ISCSI_PARAM_PING_TMO:
 655                 case ISCSI_PARAM_RECV_TMO:
 656                 case ISCSI_PARAM_INITIAL_R2T_EN:
 657                 case ISCSI_PARAM_MAX_R2T:
 658                 case ISCSI_PARAM_IMM_DATA_EN:
 659                 case ISCSI_PARAM_FIRST_BURST:
 660                 case ISCSI_PARAM_MAX_BURST:
 661                 case ISCSI_PARAM_PDU_INORDER_EN:
 662                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
 663                 case ISCSI_PARAM_TARGET_NAME:
 664                 case ISCSI_PARAM_TPGT:
 665                 case ISCSI_PARAM_USERNAME:
 666                 case ISCSI_PARAM_PASSWORD:
 667                 case ISCSI_PARAM_USERNAME_IN:
 668                 case ISCSI_PARAM_PASSWORD_IN:
 669                 case ISCSI_PARAM_FAST_ABORT:
 670                 case ISCSI_PARAM_ABORT_TMO:
 671                 case ISCSI_PARAM_LU_RESET_TMO:
 672                 case ISCSI_PARAM_TGT_RESET_TMO:
 673                 case ISCSI_PARAM_IFACE_NAME:
 674                 case ISCSI_PARAM_INITIATOR_NAME:
 675                         return S_IRUGO;
 676                 default:
 677                         return 0;
 678                 }
 679         }
 680
 681         return 0;
 682 }
 683
 684 static struct scsi_host_template iscsi_iser_sht = {
 685         .module                 = THIS_MODULE,
 686         .name                   = "iSCSI Initiator over iSER",
 687         .queuecommand           = iscsi_queuecommand,
 688         .change_queue_depth     = iscsi_change_queue_depth,
 689         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 690         .max_sectors            = 1024,
 691         .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
 692         .eh_abort_handler       = iscsi_eh_abort,
 693         .eh_device_reset_handler= iscsi_eh_device_reset,
 694         .eh_target_reset_handler = iscsi_eh_recover_target,
 695         .target_alloc           = iscsi_target_alloc,
 696         .use_clustering         = DISABLE_CLUSTERING,
 697         .proc_name              = "iscsi_iser",
 698         .this_id                = -1,
 699 };
 700
 701 static struct iscsi_transport iscsi_iser_transport = {
 702         .owner                  = THIS_MODULE,
 703         .name                   = "iser",
 704         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 705         /* session management */
 706         .create_session         = iscsi_iser_session_create,
 707         .destroy_session        = iscsi_iser_session_destroy,
 708         /* connection management */
 709         .create_conn            = iscsi_iser_conn_create,
 710         .bind_conn              = iscsi_iser_conn_bind,
 711         .destroy_conn           = iscsi_iser_conn_destroy,
 712         .attr_is_visible        = iser_attr_is_visible,
 713         .set_param              = iscsi_iser_set_param,
 714         .get_conn_param         = iscsi_conn_get_param,
 715         .get_ep_param           = iscsi_iser_get_ep_param,
 716         .get_session_param      = iscsi_session_get_param,
 717         .start_conn             = iscsi_conn_start,
 718         .stop_conn              = iscsi_iser_conn_stop,
 719         /* iscsi host params */
 720         .get_host_param         = iscsi_host_get_param,
 721         .set_host_param         = iscsi_host_set_param,
 722         /* IO */
 723         .send_pdu               = iscsi_conn_send_pdu,
 724         .get_stats              = iscsi_iser_conn_get_stats,
 725         .init_task              = iscsi_iser_task_init,
 726         .xmit_task              = iscsi_iser_task_xmit,
 727         .cleanup_task           = iscsi_iser_cleanup_task,
 728         .alloc_pdu              = iscsi_iser_pdu_alloc,
 729         /* recovery */
 730         .session_recovery_timedout = iscsi_session_recovery_timedout,
 731
 732         .ep_connect             = iscsi_iser_ep_connect,
 733         .ep_poll                = iscsi_iser_ep_poll,
 734         .ep_disconnect          = iscsi_iser_ep_disconnect
 735 };
 736
 737 static int __init iser_init(void)
 738 {
 739         int err;
 740
 741         iser_dbg("Starting iSER datamover...\n");
 742
 743         if (iscsi_max_lun < 1) {
 744                 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
 745                 return -EINVAL;
 746         }
 747
 748         memset(&ig, 0, sizeof(struct iser_global));
 749
 750         ig.desc_cache = kmem_cache_create("iser_descriptors",
 751                                           sizeof(struct iser_tx_desc),
 752                                           0, SLAB_HWCACHE_ALIGN,
 753                                           NULL);
 754         if (ig.desc_cache == NULL)
 755                 return -ENOMEM;
 756
 757         /* device init is called only after the first addr resolution */
 758         mutex_init(&ig.device_list_mutex);
 759         INIT_LIST_HEAD(&ig.device_list);
 760         mutex_init(&ig.connlist_mutex);
 761         INIT_LIST_HEAD(&ig.connlist);
 762
 763         iscsi_iser_scsi_transport = iscsi_register_transport(
 764                                                         &iscsi_iser_transport);
 765         if (!iscsi_iser_scsi_transport) {
 766                 iser_err("iscsi_register_transport failed\n");
 767                 err = -EINVAL;
 768                 goto register_transport_failure;
 769         }
 770
 771         return 0;
 772
 773 register_transport_failure:
 774         kmem_cache_destroy(ig.desc_cache);
 775
 776         return err;
 777 }
 778
 779 static void __exit iser_exit(void)
 780 {
 781         iser_dbg("Removing iSER datamover...\n");
 782         iscsi_unregister_transport(&iscsi_iser_transport);
 783         kmem_cache_destroy(ig.desc_cache);
 784 }
 785
 786 module_init(iser_init);
 787 module_exit(iser_exit);