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 iscsi_session *session;
 351         struct iser_conn *ib_conn;
 352         struct iscsi_endpoint *ep;
 353         int error;
 354
 355         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 356         if (error)
 357                 return error;
 358
 359         /* the transport ep handle comes from user space so it must be
 360          * verified against the global ib connections list */
 361         ep = iscsi_lookup_endpoint(transport_eph);
 362         if (!ep) {
 363                 iser_err("can't bind eph %llx\n",
 364                          (unsigned long long)transport_eph);
 365                 return -EINVAL;
 366         }
 367         ib_conn = ep->dd_data;
 368
 369         session = conn->session;
 370         if (iser_alloc_rx_descriptors(ib_conn, session))
 371                 return -ENOMEM;
 372
 373         /* binds the iSER connection retrieved from the previously
 374          * connected ep_handle to the iSCSI layer connection. exchanges
 375          * connection pointers */
 376         iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n",
 377                   conn, conn->dd_data, ib_conn);
 378         iser_conn = conn->dd_data;
 379         ib_conn->iser_conn = iser_conn;
 380         iser_conn->ib_conn  = ib_conn;
 381         iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
 382         return 0;
 383 }
 384
 385 static void
 386 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 387 {
 388         struct iscsi_conn *conn = cls_conn->dd_data;
 389         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 390         struct iser_conn *ib_conn = iser_conn->ib_conn;
 391
 392         /*
 393          * Userspace may have goofed up and not bound the connection or
 394          * might have only partially setup the connection.
 395          */
 396         if (ib_conn) {
 397                 iscsi_conn_stop(cls_conn, flag);
 398                 /*
 399                  * There is no unbind event so the stop callback
 400                  * must release the ref from the bind.
 401                  */
 402                 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
 403         }
 404         iser_conn->ib_conn = NULL;
 405 }
 406
 407 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 408 {
 409         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 410
 411         iscsi_session_teardown(cls_session);
 412         iscsi_host_remove(shost);
 413         iscsi_host_free(shost);
 414 }
 415
 416 static struct iscsi_cls_session *
 417 iscsi_iser_session_create(struct iscsi_endpoint *ep,
 418                           uint16_t cmds_max, uint16_t qdepth,
 419                           uint32_t initial_cmdsn)
 420 {
 421         struct iscsi_cls_session *cls_session;
 422         struct iscsi_session *session;
 423         struct Scsi_Host *shost;
 424         struct iser_conn *ib_conn = NULL;
 425
 426         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
 427         if (!shost)
 428                 return NULL;
 429         shost->transportt = iscsi_iser_scsi_transport;
 430         shost->cmd_per_lun = qdepth;
 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         if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
 448                 iser_info("cmds_max changed from %u to %u\n",
 449                           cmds_max, ISER_DEF_XMIT_CMDS_MAX);
 450                 cmds_max = ISER_DEF_XMIT_CMDS_MAX;
 451         }
 452
 453         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 454                                           cmds_max, 0,
 455                                           sizeof(struct iscsi_iser_task),
 456                                           initial_cmdsn, 0);
 457         if (!cls_session)
 458                 goto remove_host;
 459         session = cls_session->dd_data;
 460
 461         shost->can_queue = session->scsi_cmds_max;
 462         return cls_session;
 463
 464 remove_host:
 465         iscsi_host_remove(shost);
 466 free_host:
 467         iscsi_host_free(shost);
 468         return NULL;
 469 }
 470
 471 static int
 472 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 473                      enum iscsi_param param, char *buf, int buflen)
 474 {
 475         int value;
 476
 477         switch (param) {
 478         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 479                 /* TBD */
 480                 break;
 481         case ISCSI_PARAM_HDRDGST_EN:
 482                 sscanf(buf, "%d", &value);
 483                 if (value) {
 484                         iser_err("DataDigest wasn't negotiated to None");
 485                         return -EPROTO;
 486                 }
 487                 break;
 488         case ISCSI_PARAM_DATADGST_EN:
 489                 sscanf(buf, "%d", &value);
 490                 if (value) {
 491                         iser_err("DataDigest wasn't negotiated to None");
 492                         return -EPROTO;
 493                 }
 494                 break;
 495         case ISCSI_PARAM_IFMARKER_EN:
 496                 sscanf(buf, "%d", &value);
 497                 if (value) {
 498                         iser_err("IFMarker wasn't negotiated to No");
 499                         return -EPROTO;
 500                 }
 501                 break;
 502         case ISCSI_PARAM_OFMARKER_EN:
 503                 sscanf(buf, "%d", &value);
 504                 if (value) {
 505                         iser_err("OFMarker wasn't negotiated to No");
 506                         return -EPROTO;
 507                 }
 508                 break;
 509         default:
 510                 return iscsi_set_param(cls_conn, param, buf, buflen);
 511         }
 512
 513         return 0;
 514 }
 515
 516 static void
 517 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 518 {
 519         struct iscsi_conn *conn = cls_conn->dd_data;
 520
 521         stats->txdata_octets = conn->txdata_octets;
 522         stats->rxdata_octets = conn->rxdata_octets;
 523         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 524         stats->dataout_pdus = conn->dataout_pdus_cnt;
 525         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 526         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 527         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 528         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 529         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 530         stats->custom_length = 4;
 531         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 532         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 533         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 534         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 535         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 536         stats->custom[2].value = conn->eh_abort_cnt;
 537         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 538         stats->custom[3].value = conn->fmr_unalign_cnt;
 539 }
 540
 541 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
 542                                    enum iscsi_param param, char *buf)
 543 {
 544         struct iser_conn *ib_conn = ep->dd_data;
 545         int len;
 546
 547         switch (param) {
 548         case ISCSI_PARAM_CONN_PORT:
 549         case ISCSI_PARAM_CONN_ADDRESS:
 550                 if (!ib_conn || !ib_conn->cma_id)
 551                         return -ENOTCONN;
 552
 553                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
 554                                         &ib_conn->cma_id->route.addr.dst_addr,
 555                                         param, buf);
 556                 break;
 557         default:
 558                 return -ENOSYS;
 559         }
 560
 561         return len;
 562 }
 563
 564 static struct iscsi_endpoint *
 565 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
 566                       int non_blocking)
 567 {
 568         int err;
 569         struct iser_conn *ib_conn;
 570         struct iscsi_endpoint *ep;
 571
 572         ep = iscsi_create_endpoint(sizeof(*ib_conn));
 573         if (!ep)
 574                 return ERR_PTR(-ENOMEM);
 575
 576         ib_conn = ep->dd_data;
 577         ib_conn->ep = ep;
 578         iser_conn_init(ib_conn);
 579
 580         err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
 581                            non_blocking);
 582         if (err)
 583                 return ERR_PTR(err);
 584
 585         return ep;
 586 }
 587
 588 static int
 589 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 590 {
 591         struct iser_conn *ib_conn;
 592         int rc;
 593
 594         ib_conn = ep->dd_data;
 595         rc = wait_event_interruptible_timeout(ib_conn->wait,
 596                              ib_conn->state == ISER_CONN_UP,
 597                              msecs_to_jiffies(timeout_ms));
 598
 599         /* if conn establishment failed, return error code to iscsi */
 600         if (!rc &&
 601             (ib_conn->state == ISER_CONN_TERMINATING ||
 602              ib_conn->state == ISER_CONN_DOWN))
 603                 rc = -1;
 604
 605         iser_info("ib conn %p rc = %d\n", ib_conn, rc);
 606
 607         if (rc > 0)
 608                 return 1; /* success, this is the equivalent of POLLOUT */
 609         else if (!rc)
 610                 return 0; /* timeout */
 611         else
 612                 return rc; /* signal */
 613 }
 614
 615 static void
 616 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 617 {
 618         struct iser_conn *ib_conn;
 619
 620         ib_conn = ep->dd_data;
 621         if (ib_conn->iser_conn)
 622                 /*
 623                  * Must suspend xmit path if the ep is bound to the
 624                  * iscsi_conn, so we know we are not accessing the ib_conn
 625                  * when we free it.
 626                  *
 627                  * This may not be bound if the ep poll failed.
 628                  */
 629                 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
 630
 631
 632         iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state);
 633         iser_conn_terminate(ib_conn);
 634 }
 635
 636 static umode_t iser_attr_is_visible(int param_type, int param)
 637 {
 638         switch (param_type) {
 639         case ISCSI_HOST_PARAM:
 640                 switch (param) {
 641                 case ISCSI_HOST_PARAM_NETDEV_NAME:
 642                 case ISCSI_HOST_PARAM_HWADDRESS:
 643                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
 644                         return S_IRUGO;
 645                 default:
 646                         return 0;
 647                 }
 648         case ISCSI_PARAM:
 649                 switch (param) {
 650                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
 651                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 652                 case ISCSI_PARAM_HDRDGST_EN:
 653                 case ISCSI_PARAM_DATADGST_EN:
 654                 case ISCSI_PARAM_CONN_ADDRESS:
 655                 case ISCSI_PARAM_CONN_PORT:
 656                 case ISCSI_PARAM_EXP_STATSN:
 657                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
 658                 case ISCSI_PARAM_PERSISTENT_PORT:
 659                 case ISCSI_PARAM_PING_TMO:
 660                 case ISCSI_PARAM_RECV_TMO:
 661                 case ISCSI_PARAM_INITIAL_R2T_EN:
 662                 case ISCSI_PARAM_MAX_R2T:
 663                 case ISCSI_PARAM_IMM_DATA_EN:
 664                 case ISCSI_PARAM_FIRST_BURST:
 665                 case ISCSI_PARAM_MAX_BURST:
 666                 case ISCSI_PARAM_PDU_INORDER_EN:
 667                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
 668                 case ISCSI_PARAM_TARGET_NAME:
 669                 case ISCSI_PARAM_TPGT:
 670                 case ISCSI_PARAM_USERNAME:
 671                 case ISCSI_PARAM_PASSWORD:
 672                 case ISCSI_PARAM_USERNAME_IN:
 673                 case ISCSI_PARAM_PASSWORD_IN:
 674                 case ISCSI_PARAM_FAST_ABORT:
 675                 case ISCSI_PARAM_ABORT_TMO:
 676                 case ISCSI_PARAM_LU_RESET_TMO:
 677                 case ISCSI_PARAM_TGT_RESET_TMO:
 678                 case ISCSI_PARAM_IFACE_NAME:
 679                 case ISCSI_PARAM_INITIATOR_NAME:
 680                 case ISCSI_PARAM_DISCOVERY_SESS:
 681                         return S_IRUGO;
 682                 default:
 683                         return 0;
 684                 }
 685         }
 686
 687         return 0;
 688 }
 689
 690 static struct scsi_host_template iscsi_iser_sht = {
 691         .module                 = THIS_MODULE,
 692         .name                   = "iSCSI Initiator over iSER",
 693         .queuecommand           = iscsi_queuecommand,
 694         .change_queue_depth     = iscsi_change_queue_depth,
 695         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 696         .max_sectors            = 1024,
 697         .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
 698         .eh_abort_handler       = iscsi_eh_abort,
 699         .eh_device_reset_handler= iscsi_eh_device_reset,
 700         .eh_target_reset_handler = iscsi_eh_recover_target,
 701         .target_alloc           = iscsi_target_alloc,
 702         .use_clustering         = DISABLE_CLUSTERING,
 703         .proc_name              = "iscsi_iser",
 704         .this_id                = -1,
 705 };
 706
 707 static struct iscsi_transport iscsi_iser_transport = {
 708         .owner                  = THIS_MODULE,
 709         .name                   = "iser",
 710         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
 711         /* session management */
 712         .create_session         = iscsi_iser_session_create,
 713         .destroy_session        = iscsi_iser_session_destroy,
 714         /* connection management */
 715         .create_conn            = iscsi_iser_conn_create,
 716         .bind_conn              = iscsi_iser_conn_bind,
 717         .destroy_conn           = iscsi_iser_conn_destroy,
 718         .attr_is_visible        = iser_attr_is_visible,
 719         .set_param              = iscsi_iser_set_param,
 720         .get_conn_param         = iscsi_conn_get_param,
 721         .get_ep_param           = iscsi_iser_get_ep_param,
 722         .get_session_param      = iscsi_session_get_param,
 723         .start_conn             = iscsi_conn_start,
 724         .stop_conn              = iscsi_iser_conn_stop,
 725         /* iscsi host params */
 726         .get_host_param         = iscsi_host_get_param,
 727         .set_host_param         = iscsi_host_set_param,
 728         /* IO */
 729         .send_pdu               = iscsi_conn_send_pdu,
 730         .get_stats              = iscsi_iser_conn_get_stats,
 731         .init_task              = iscsi_iser_task_init,
 732         .xmit_task              = iscsi_iser_task_xmit,
 733         .cleanup_task           = iscsi_iser_cleanup_task,
 734         .alloc_pdu              = iscsi_iser_pdu_alloc,
 735         /* recovery */
 736         .session_recovery_timedout = iscsi_session_recovery_timedout,
 737
 738         .ep_connect             = iscsi_iser_ep_connect,
 739         .ep_poll                = iscsi_iser_ep_poll,
 740         .ep_disconnect          = iscsi_iser_ep_disconnect
 741 };
 742
 743 static int __init iser_init(void)
 744 {
 745         int err;
 746
 747         iser_dbg("Starting iSER datamover...\n");
 748
 749         if (iscsi_max_lun < 1) {
 750                 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
 751                 return -EINVAL;
 752         }
 753
 754         memset(&ig, 0, sizeof(struct iser_global));
 755
 756         ig.desc_cache = kmem_cache_create("iser_descriptors",
 757                                           sizeof(struct iser_tx_desc),
 758                                           0, SLAB_HWCACHE_ALIGN,
 759                                           NULL);
 760         if (ig.desc_cache == NULL)
 761                 return -ENOMEM;
 762
 763         /* device init is called only after the first addr resolution */
 764         mutex_init(&ig.device_list_mutex);
 765         INIT_LIST_HEAD(&ig.device_list);
 766         mutex_init(&ig.connlist_mutex);
 767         INIT_LIST_HEAD(&ig.connlist);
 768
 769         iscsi_iser_scsi_transport = iscsi_register_transport(
 770                                                         &iscsi_iser_transport);
 771         if (!iscsi_iser_scsi_transport) {
 772                 iser_err("iscsi_register_transport failed\n");
 773                 err = -EINVAL;
 774                 goto register_transport_failure;
 775         }
 776
 777         return 0;
 778
 779 register_transport_failure:
 780         kmem_cache_destroy(ig.desc_cache);
 781
 782         return err;
 783 }
 784
 785 static void __exit iser_exit(void)
 786 {
 787         iser_dbg("Removing iSER datamover...\n");
 788         iscsi_unregister_transport(&iscsi_iser_transport);
 789         kmem_cache_destroy(ig.desc_cache);
 790 }
 791
 792 module_init(iser_init);
 793 module_exit(iser_exit);