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 #include <linux/slab.h>
  60
  61 #include <net/sock.h>
  62
  63 #include <asm/uaccess.h>
  64
  65 #include <scsi/scsi_cmnd.h>
  66 #include <scsi/scsi_device.h>
  67 #include <scsi/scsi_eh.h>
  68 #include <scsi/scsi_tcq.h>
  69 #include <scsi/scsi_host.h>
  70 #include <scsi/scsi.h>
  71 #include <scsi/scsi_transport_iscsi.h>
  72
  73 #include "iscsi_iser.h"
  74
  75 static struct scsi_host_template iscsi_iser_sht;
  76 static struct iscsi_transport iscsi_iser_transport;
  77 static struct scsi_transport_template *iscsi_iser_scsi_transport;
  78
  79 static unsigned int iscsi_max_lun = 512;
  80 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
  81
  82 int iser_debug_level = 0;
  83
  84 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
  85                    "v" DRV_VER " (" DRV_DATE ")");
  86 MODULE_LICENSE("Dual BSD/GPL");
  87 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
  88
  89 module_param_named(debug_level, iser_debug_level, int, 0644);
  90 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
  91
  92 struct iser_global ig;
  93
  94 void
  95 iscsi_iser_recv(struct iscsi_conn *conn,
  96                 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
  97 {
  98         int rc = 0;
  99         int datalen;
 100         int ahslen;
 101
 102         /* verify PDU length */
 103         datalen = ntoh24(hdr->dlength);
 104         if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
 105                 iser_err("wrong datalen %d (hdr), %d (IB)\n",
 106                         datalen, rx_data_len);
 107                 rc = ISCSI_ERR_DATALEN;
 108                 goto error;
 109         }
 110
 111         if (datalen != rx_data_len)
 112                 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
 113                         datalen, rx_data_len);
 114
 115         /* read AHS */
 116         ahslen = hdr->hlength * 4;
 117
 118         rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
 119         if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
 120                 goto error;
 121
 122         return;
 123 error:
 124         iscsi_conn_failure(conn, rc);
 125 }
 126
 127 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
 128 {
 129         struct iscsi_iser_task *iser_task = task->dd_data;
 130
 131         task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
 132         task->hdr_max = sizeof(iser_task->desc.iscsi_header);
 133         return 0;
 134 }
 135
 136 int iser_initialize_task_headers(struct iscsi_task *task,
 137                                                 struct iser_tx_desc *tx_desc)
 138 {
 139         struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
 140         struct iser_device     *device    = iser_conn->ib_conn->device;
 141         struct iscsi_iser_task *iser_task = task->dd_data;
 142         u64 dma_addr;
 143
 144         dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
 145                                 ISER_HEADERS_LEN, DMA_TO_DEVICE);
 146         if (ib_dma_mapping_error(device->ib_device, dma_addr))
 147                 return -ENOMEM;
 148
 149         tx_desc->dma_addr = dma_addr;
 150         tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;
 151         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 152         tx_desc->tx_sg[0].lkey   = device->mr->lkey;
 153
 154         iser_task->headers_initialized  = 1;
 155         iser_task->iser_conn            = iser_conn;
 156         return 0;
 157 }
 158 /**
 159  * iscsi_iser_task_init - Initialize task
 160  * @task: iscsi task
 161  *
 162  * Initialize the task for the scsi command or mgmt command.
 163  */
 164 static int
 165 iscsi_iser_task_init(struct iscsi_task *task)
 166 {
 167         struct iscsi_iser_task *iser_task = task->dd_data;
 168
 169         if (!iser_task->headers_initialized)
 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
 282         /* mgmt tasks do not need special cleanup */
 283         if (!task->sc)
 284                 return;
 285
 286         if (iser_task->status == ISER_TASK_STATUS_STARTED) {
 287                 iser_task->status = ISER_TASK_STATUS_COMPLETED;
 288                 iser_task_rdma_finalize(iser_task);
 289         }
 290 }
 291
 292 static struct iscsi_cls_conn *
 293 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 294 {
 295         struct iscsi_conn *conn;
 296         struct iscsi_cls_conn *cls_conn;
 297         struct iscsi_iser_conn *iser_conn;
 298
 299         cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
 300         if (!cls_conn)
 301                 return NULL;
 302         conn = cls_conn->dd_data;
 303
 304         /*
 305          * due to issues with the login code re iser sematics
 306          * this not set in iscsi_conn_setup - FIXME
 307          */
 308         conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
 309
 310         iser_conn = conn->dd_data;
 311         conn->dd_data = iser_conn;
 312         iser_conn->iscsi_conn = conn;
 313
 314         return cls_conn;
 315 }
 316
 317 static void
 318 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
 319 {
 320         struct iscsi_conn *conn = cls_conn->dd_data;
 321         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 322         struct iser_conn *ib_conn = iser_conn->ib_conn;
 323
 324         iscsi_conn_teardown(cls_conn);
 325         /*
 326          * Userspace will normally call the stop callback and
 327          * already have freed the ib_conn, but if it goofed up then
 328          * we free it here.
 329          */
 330         if (ib_conn) {
 331                 ib_conn->iser_conn = NULL;
 332                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 333         }
 334 }
 335
 336 static int
 337 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 338                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 339                      int is_leading)
 340 {
 341         struct iscsi_conn *conn = cls_conn->dd_data;
 342         struct iscsi_iser_conn *iser_conn;
 343         struct iser_conn *ib_conn;
 344         struct iscsi_endpoint *ep;
 345         int error;
 346
 347         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 348         if (error)
 349                 return error;
 350
 351         /* the transport ep handle comes from user space so it must be
 352          * verified against the global ib connections list */
 353         ep = iscsi_lookup_endpoint(transport_eph);
 354         if (!ep) {
 355                 iser_err("can't bind eph %llx\n",
 356                          (unsigned long long)transport_eph);
 357                 return -EINVAL;
 358         }
 359         ib_conn = ep->dd_data;
 360
 361         /* binds the iSER connection retrieved from the previously
 362          * connected ep_handle to the iSCSI layer connection. exchanges
 363          * connection pointers */
 364         iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n",
 365                                         conn, conn->dd_data, ib_conn);
 366         iser_conn = conn->dd_data;
 367         ib_conn->iser_conn = iser_conn;
 368         iser_conn->ib_conn  = ib_conn;
 369         iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
 370         return 0;
 371 }
 372
 373 static void
 374 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 375 {
 376         struct iscsi_conn *conn = cls_conn->dd_data;
 377         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 378         struct iser_conn *ib_conn = iser_conn->ib_conn;
 379
 380         /*
 381          * Userspace may have goofed up and not bound the connection or
 382          * might have only partially setup the connection.
 383          */
 384         if (ib_conn) {
 385                 iscsi_conn_stop(cls_conn, flag);
 386                 /*
 387                  * There is no unbind event so the stop callback
 388                  * must release the ref from the bind.
 389                  */
 390                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 391         }
 392         iser_conn->ib_conn = NULL;
 393 }
 394
 395 static int
 396 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 397 {
 398         struct iscsi_conn *conn = cls_conn->dd_data;
 399         int err;
 400
 401         err = iser_conn_set_full_featured_mode(conn);
 402         if (err)
 403                 return err;
 404
 405         return iscsi_conn_start(cls_conn);
 406 }
 407
 408 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 409 {
 410         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 411
 412         iscsi_session_teardown(cls_session);
 413         iscsi_host_remove(shost);
 414         iscsi_host_free(shost);
 415 }
 416
 417 static struct iscsi_cls_session *
 418 iscsi_iser_session_create(struct iscsi_endpoint *ep,
 419                           uint16_t cmds_max, uint16_t qdepth,
 420                           uint32_t initial_cmdsn)
 421 {
 422         struct iscsi_cls_session *cls_session;
 423         struct iscsi_session *session;
 424         struct Scsi_Host *shost;
 425         struct iser_conn *ib_conn;
 426
 427         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
 428         if (!shost)
 429                 return NULL;
 430         shost->transportt = iscsi_iser_scsi_transport;
 431         shost->max_lun = iscsi_max_lun;
 432         shost->max_id = 0;
 433         shost->max_channel = 0;
 434         shost->max_cmd_len = 16;
 435
 436         /*
 437          * older userspace tools (before 2.0-870) did not pass us
 438          * the leading conn's ep so this will be NULL;
 439          */
 440         if (ep)
 441                 ib_conn = ep->dd_data;
 442
 443         if (iscsi_host_add(shost,
 444                            ep ? ib_conn->device->ib_device->dma_device : NULL))
 445                 goto free_host;
 446
 447         /*
 448          * we do not support setting can_queue cmd_per_lun from userspace yet
 449          * because we preallocate so many resources
 450          */
 451         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 452                                           ISCSI_DEF_XMIT_CMDS_MAX, 0,
 453                                           sizeof(struct iscsi_iser_task),
 454                                           initial_cmdsn, 0);
 455         if (!cls_session)
 456                 goto remove_host;
 457         session = cls_session->dd_data;
 458
 459         shost->can_queue = session->scsi_cmds_max;
 460         return cls_session;
 461
 462 remove_host:
 463         iscsi_host_remove(shost);
 464 free_host:
 465         iscsi_host_free(shost);
 466         return NULL;
 467 }
 468
 469 static int
 470 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 471                      enum iscsi_param param, char *buf, int buflen)
 472 {
 473         int value;
 474
 475         switch (param) {
 476         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 477                 /* TBD */
 478                 break;
 479         case ISCSI_PARAM_HDRDGST_EN:
 480                 sscanf(buf, "%d", &value);
 481                 if (value) {
 482                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 483                         return -EPROTO;
 484                 }
 485                 break;
 486         case ISCSI_PARAM_DATADGST_EN:
 487                 sscanf(buf, "%d", &value);
 488                 if (value) {
 489                         printk(KERN_ERR "DataDigest wasn't negotiated to None");
 490                         return -EPROTO;
 491                 }
 492                 break;
 493         case ISCSI_PARAM_IFMARKER_EN:
 494                 sscanf(buf, "%d", &value);
 495                 if (value) {
 496                         printk(KERN_ERR "IFMarker wasn't negotiated to No");
 497                         return -EPROTO;
 498                 }
 499                 break;
 500         case ISCSI_PARAM_OFMARKER_EN:
 501                 sscanf(buf, "%d", &value);
 502                 if (value) {
 503                         printk(KERN_ERR "OFMarker wasn't negotiated to No");
 504                         return -EPROTO;
 505                 }
 506                 break;
 507         default:
 508                 return iscsi_set_param(cls_conn, param, buf, buflen);
 509         }
 510
 511         return 0;
 512 }
 513
 514 static void
 515 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 516 {
 517         struct iscsi_conn *conn = cls_conn->dd_data;
 518
 519         stats->txdata_octets = conn->txdata_octets;
 520         stats->rxdata_octets = conn->rxdata_octets;
 521         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 522         stats->dataout_pdus = conn->dataout_pdus_cnt;
 523         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 524         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 525         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 526         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 527         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 528         stats->custom_length = 4;
 529         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 530         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 531         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 532         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 533         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 534         stats->custom[2].value = conn->eh_abort_cnt;
 535         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 536         stats->custom[3].value = conn->fmr_unalign_cnt;
 537 }
 538
 539 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
 540                                    enum iscsi_param param, char *buf)
 541 {
 542         struct iser_conn *ib_conn = ep->dd_data;
 543         int len;
 544
 545         switch (param) {
 546         case ISCSI_PARAM_CONN_PORT:
 547         case ISCSI_PARAM_CONN_ADDRESS:
 548                 if (!ib_conn || !ib_conn->cma_id)
 549                         return -ENOTCONN;
 550
 551                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
 552                                         &ib_conn->cma_id->route.addr.dst_addr,
 553                                         param, buf);
 554                 break;
 555         default:
 556                 return -ENOSYS;
 557         }
 558
 559         return len;
 560 }
 561
 562 static struct iscsi_endpoint *
 563 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
 564                       int non_blocking)
 565 {
 566         int err;
 567         struct iser_conn *ib_conn;
 568         struct iscsi_endpoint *ep;
 569
 570         ep = iscsi_create_endpoint(sizeof(*ib_conn));
 571         if (!ep)
 572                 return ERR_PTR(-ENOMEM);
 573
 574         ib_conn = ep->dd_data;
 575         ib_conn->ep = ep;
 576         iser_conn_init(ib_conn);
 577
 578         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
 579                            non_blocking);
 580         if (err) {
 581                 iscsi_destroy_endpoint(ep);
 582                 return ERR_PTR(err);
 583         }
 584         return ep;
 585 }
 586
 587 static int
 588 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 589 {
 590         struct iser_conn *ib_conn;
 591         int rc;
 592
 593         ib_conn = ep->dd_data;
 594         rc = wait_event_interruptible_timeout(ib_conn->wait,
 595                              ib_conn->state == ISER_CONN_UP,
 596                              msecs_to_jiffies(timeout_ms));
 597
 598         /* if conn establishment failed, return error code to iscsi */
 599         if (!rc &&
 600             (ib_conn->state == ISER_CONN_TERMINATING ||
 601              ib_conn->state == ISER_CONN_DOWN))
 602                 rc = -1;
 603
 604         iser_err("ib conn %p rc = %d\n", ib_conn, rc);
 605
 606         if (rc > 0)
 607                 return 1; /* success, this is the equivalent of POLLOUT */
 608         else if (!rc)
 609                 return 0; /* timeout */
 610         else
 611                 return rc; /* signal */
 612 }
 613
 614 static void
 615 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 616 {
 617         struct iser_conn *ib_conn;
 618
 619         ib_conn = ep->dd_data;
 620         if (ib_conn->iser_conn)
 621                 /*
 622                  * Must suspend xmit path if the ep is bound to the
 623                  * iscsi_conn, so we know we are not accessing the ib_conn
 624                  * when we free it.
 625                  *
 626                  * This may not be bound if the ep poll failed.
 627                  */
 628                 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
 629
 630
 631         iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
 632         iser_conn_terminate(ib_conn);
 633 }
 634
 635 static mode_t iser_attr_is_visible(int param_type, int param)
 636 {
 637         switch (param_type) {
 638         case ISCSI_HOST_PARAM:
 639                 switch (param) {
 640                 case ISCSI_HOST_PARAM_NETDEV_NAME:
 641                 case ISCSI_HOST_PARAM_HWADDRESS:
 642                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
 643                         return S_IRUGO;
 644                 default:
 645                         return 0;
 646                 }
 647         case ISCSI_PARAM:
 648                 switch (param) {
 649                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
 650                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 651                 case ISCSI_PARAM_HDRDGST_EN:
 652                 case ISCSI_PARAM_DATADGST_EN:
 653                 case ISCSI_PARAM_CONN_ADDRESS:
 654                 case ISCSI_PARAM_CONN_PORT:
 655                 case ISCSI_PARAM_EXP_STATSN:
 656                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
 657                 case ISCSI_PARAM_PERSISTENT_PORT:
 658                 case ISCSI_PARAM_PING_TMO:
 659                 case ISCSI_PARAM_RECV_TMO:
 660                 case ISCSI_PARAM_INITIAL_R2T_EN:
 661                 case ISCSI_PARAM_MAX_R2T:
 662                 case ISCSI_PARAM_IMM_DATA_EN:
 663                 case ISCSI_PARAM_FIRST_BURST:
 664                 case ISCSI_PARAM_MAX_BURST:
 665                 case ISCSI_PARAM_PDU_INORDER_EN:
 666                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
 667                 case ISCSI_PARAM_TARGET_NAME:
 668                 case ISCSI_PARAM_TPGT:
 669                 case ISCSI_PARAM_USERNAME:
 670                 case ISCSI_PARAM_PASSWORD:
 671                 case ISCSI_PARAM_USERNAME_IN:
 672                 case ISCSI_PARAM_PASSWORD_IN:
 673                 case ISCSI_PARAM_FAST_ABORT:
 674                 case ISCSI_PARAM_ABORT_TMO:
 675                 case ISCSI_PARAM_LU_RESET_TMO:
 676                 case ISCSI_PARAM_TGT_RESET_TMO:
 677                 case ISCSI_PARAM_IFACE_NAME:
 678                 case ISCSI_PARAM_INITIATOR_NAME:
 679                         return S_IRUGO;
 680                 default:
 681                         return 0;
 682                 }
 683         }
 684
 685         return 0;
 686 }
 687
 688 static struct scsi_host_template iscsi_iser_sht = {
 689         .module                 = THIS_MODULE,
 690         .name                   = "iSCSI Initiator over iSER, v." DRV_VER,
 691         .queuecommand           = iscsi_queuecommand,
 692         .change_queue_depth     = iscsi_change_queue_depth,
 693         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 694         .max_sectors            = 1024,
 695         .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
 696         .eh_abort_handler       = iscsi_eh_abort,
 697         .eh_device_reset_handler= iscsi_eh_device_reset,
 698         .eh_target_reset_handler = iscsi_eh_recover_target,
 699         .target_alloc           = iscsi_target_alloc,
 700         .use_clustering         = DISABLE_CLUSTERING,
 701         .proc_name              = "iscsi_iser",
 702         .this_id                = -1,
 703 };
 704
 705 static struct iscsi_transport iscsi_iser_transport = {
 706         .owner                  = THIS_MODULE,
 707         .name                   = "iser",
 708         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
 709         /* session management */
 710         .create_session         = iscsi_iser_session_create,
 711         .destroy_session        = iscsi_iser_session_destroy,
 712         /* connection management */
 713         .create_conn            = iscsi_iser_conn_create,
 714         .bind_conn              = iscsi_iser_conn_bind,
 715         .destroy_conn           = iscsi_iser_conn_destroy,
 716         .attr_is_visible        = iser_attr_is_visible,
 717         .set_param              = iscsi_iser_set_param,
 718         .get_conn_param         = iscsi_conn_get_param,
 719         .get_ep_param           = iscsi_iser_get_ep_param,
 720         .get_session_param      = iscsi_session_get_param,
 721         .start_conn             = iscsi_iser_conn_start,
 722         .stop_conn              = iscsi_iser_conn_stop,
 723         /* iscsi host params */
 724         .get_host_param         = iscsi_host_get_param,
 725         .set_host_param         = iscsi_host_set_param,
 726         /* IO */
 727         .send_pdu               = iscsi_conn_send_pdu,
 728         .get_stats              = iscsi_iser_conn_get_stats,
 729         .init_task              = iscsi_iser_task_init,
 730         .xmit_task              = iscsi_iser_task_xmit,
 731         .cleanup_task           = iscsi_iser_cleanup_task,
 732         .alloc_pdu              = iscsi_iser_pdu_alloc,
 733         /* recovery */
 734         .session_recovery_timedout = iscsi_session_recovery_timedout,
 735
 736         .ep_connect             = iscsi_iser_ep_connect,
 737         .ep_poll                = iscsi_iser_ep_poll,
 738         .ep_disconnect          = iscsi_iser_ep_disconnect
 739 };
 740
 741 static int __init iser_init(void)
 742 {
 743         int err;
 744
 745         iser_dbg("Starting iSER datamover...\n");
 746
 747         if (iscsi_max_lun < 1) {
 748                 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
 749                 return -EINVAL;
 750         }
 751
 752         memset(&ig, 0, sizeof(struct iser_global));
 753
 754         ig.desc_cache = kmem_cache_create("iser_descriptors",
 755                                           sizeof(struct iser_tx_desc),
 756                                           0, SLAB_HWCACHE_ALIGN,
 757                                           NULL);
 758         if (ig.desc_cache == NULL)
 759                 return -ENOMEM;
 760
 761         /* device init is called only after the first addr resolution */
 762         mutex_init(&ig.device_list_mutex);
 763         INIT_LIST_HEAD(&ig.device_list);
 764         mutex_init(&ig.connlist_mutex);
 765         INIT_LIST_HEAD(&ig.connlist);
 766
 767         iscsi_iser_scsi_transport = iscsi_register_transport(
 768                                                         &iscsi_iser_transport);
 769         if (!iscsi_iser_scsi_transport) {
 770                 iser_err("iscsi_register_transport failed\n");
 771                 err = -EINVAL;
 772                 goto register_transport_failure;
 773         }
 774
 775         return 0;
 776
 777 register_transport_failure:
 778         kmem_cache_destroy(ig.desc_cache);
 779
 780         return err;
 781 }
 782
 783 static void __exit iser_exit(void)
 784 {
 785         iser_dbg("Removing iSER datamover...\n");
 786         iscsi_unregister_transport(&iscsi_iser_transport);
 787         kmem_cache_destroy(ig.desc_cache);
 788 }
 789
 790 module_init(iser_init);
 791 module_exit(iser_exit);