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) 2013-2014 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 bool iser_pi_enable = false;
  86 int iser_pi_guard = 0;
  87
  88 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
  89 MODULE_LICENSE("Dual BSD/GPL");
  90 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
  91 MODULE_VERSION(DRV_VER);
  92
  93 module_param_named(debug_level, iser_debug_level, int, 0644);
  94 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
  95
  96 module_param_named(pi_enable, iser_pi_enable, bool, 0644);
  97 MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
  98
  99 module_param_named(pi_guard, iser_pi_guard, int, 0644);
 100 MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)");
 101
 102 static struct workqueue_struct *release_wq;
 103 struct iser_global ig;
 104
 105 void
 106 iscsi_iser_recv(struct iscsi_conn *conn,
 107                 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
 108 {
 109         int rc = 0;
 110         int datalen;
 111         int ahslen;
 112
 113         /* verify PDU length */
 114         datalen = ntoh24(hdr->dlength);
 115         if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
 116                 iser_err("wrong datalen %d (hdr), %d (IB)\n",
 117                         datalen, rx_data_len);
 118                 rc = ISCSI_ERR_DATALEN;
 119                 goto error;
 120         }
 121
 122         if (datalen != rx_data_len)
 123                 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
 124                         datalen, rx_data_len);
 125
 126         /* read AHS */
 127         ahslen = hdr->hlength * 4;
 128
 129         rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
 130         if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
 131                 goto error;
 132
 133         return;
 134 error:
 135         iscsi_conn_failure(conn, rc);
 136 }
 137
 138 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
 139 {
 140         struct iscsi_iser_task *iser_task = task->dd_data;
 141
 142         task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
 143         task->hdr_max = sizeof(iser_task->desc.iscsi_header);
 144         return 0;
 145 }
 146
 147 int iser_initialize_task_headers(struct iscsi_task *task,
 148                                                 struct iser_tx_desc *tx_desc)
 149 {
 150         struct iser_conn       *ib_conn   = task->conn->dd_data;
 151         struct iser_device     *device    = ib_conn->device;
 152         struct iscsi_iser_task *iser_task = task->dd_data;
 153         u64 dma_addr;
 154
 155         dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
 156                                 ISER_HEADERS_LEN, DMA_TO_DEVICE);
 157         if (ib_dma_mapping_error(device->ib_device, dma_addr))
 158                 return -ENOMEM;
 159
 160         tx_desc->dma_addr = dma_addr;
 161         tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;
 162         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 163         tx_desc->tx_sg[0].lkey   = device->mr->lkey;
 164
 165         iser_task->ib_conn = ib_conn;
 166         return 0;
 167 }
 168 /**
 169  * iscsi_iser_task_init - Initialize task
 170  * @task: iscsi task
 171  *
 172  * Initialize the task for the scsi command or mgmt command.
 173  */
 174 static int
 175 iscsi_iser_task_init(struct iscsi_task *task)
 176 {
 177         struct iscsi_iser_task *iser_task = task->dd_data;
 178
 179         if (iser_initialize_task_headers(task, &iser_task->desc))
 180                         return -ENOMEM;
 181
 182         /* mgmt task */
 183         if (!task->sc)
 184                 return 0;
 185
 186         iser_task->command_sent = 0;
 187         iser_task_rdma_init(iser_task);
 188         iser_task->sc = task->sc;
 189
 190         return 0;
 191 }
 192
 193 /**
 194  * iscsi_iser_mtask_xmit - xmit management(immediate) task
 195  * @conn: iscsi connection
 196  * @task: task management task
 197  *
 198  * Notes:
 199  *      The function can return -EAGAIN in which case caller must
 200  *      call it again later, or recover. '0' return code means successful
 201  *      xmit.
 202  *
 203  **/
 204 static int
 205 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
 206 {
 207         int error = 0;
 208
 209         iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
 210
 211         error = iser_send_control(conn, task);
 212
 213         /* since iser xmits control with zero copy, tasks can not be recycled
 214          * right after sending them.
 215          * The recycling scheme is based on whether a response is expected
 216          * - if yes, the task is recycled at iscsi_complete_pdu
 217          * - if no,  the task is recycled at iser_snd_completion
 218          */
 219         return error;
 220 }
 221
 222 static int
 223 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
 224                                  struct iscsi_task *task)
 225 {
 226         struct iscsi_r2t_info *r2t = &task->unsol_r2t;
 227         struct iscsi_data hdr;
 228         int error = 0;
 229
 230         /* Send data-out PDUs while there's still unsolicited data to send */
 231         while (iscsi_task_has_unsol_data(task)) {
 232                 iscsi_prep_data_out_pdu(task, r2t, &hdr);
 233                 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
 234                            hdr.itt, r2t->data_count);
 235
 236                 /* the buffer description has been passed with the command */
 237                 /* Send the command */
 238                 error = iser_send_data_out(conn, task, &hdr);
 239                 if (error) {
 240                         r2t->datasn--;
 241                         goto iscsi_iser_task_xmit_unsol_data_exit;
 242                 }
 243                 r2t->sent += r2t->data_count;
 244                 iser_dbg("Need to send %d more as data-out PDUs\n",
 245                            r2t->data_length - r2t->sent);
 246         }
 247
 248 iscsi_iser_task_xmit_unsol_data_exit:
 249         return error;
 250 }
 251
 252 static int
 253 iscsi_iser_task_xmit(struct iscsi_task *task)
 254 {
 255         struct iscsi_conn *conn = task->conn;
 256         struct iscsi_iser_task *iser_task = task->dd_data;
 257         int error = 0;
 258
 259         if (!task->sc)
 260                 return iscsi_iser_mtask_xmit(conn, task);
 261
 262         if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
 263                 BUG_ON(scsi_bufflen(task->sc) == 0);
 264
 265                 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
 266                            task->itt, scsi_bufflen(task->sc),
 267                            task->imm_count, task->unsol_r2t.data_length);
 268         }
 269
 270         iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
 271                    conn->id, task->itt);
 272
 273         /* Send the cmd PDU */
 274         if (!iser_task->command_sent) {
 275                 error = iser_send_command(conn, task);
 276                 if (error)
 277                         goto iscsi_iser_task_xmit_exit;
 278                 iser_task->command_sent = 1;
 279         }
 280
 281         /* Send unsolicited data-out PDU(s) if necessary */
 282         if (iscsi_task_has_unsol_data(task))
 283                 error = iscsi_iser_task_xmit_unsol_data(conn, task);
 284
 285  iscsi_iser_task_xmit_exit:
 286         return error;
 287 }
 288
 289 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
 290 {
 291         struct iscsi_iser_task *iser_task = task->dd_data;
 292         struct iser_tx_desc    *tx_desc   = &iser_task->desc;
 293         struct iser_conn       *ib_conn   = task->conn->dd_data;
 294         struct iser_device     *device    = ib_conn->device;
 295
 296         ib_dma_unmap_single(device->ib_device,
 297                 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
 298
 299         /* mgmt tasks do not need special cleanup */
 300         if (!task->sc)
 301                 return;
 302
 303         if (iser_task->status == ISER_TASK_STATUS_STARTED) {
 304                 iser_task->status = ISER_TASK_STATUS_COMPLETED;
 305                 iser_task_rdma_finalize(iser_task);
 306         }
 307 }
 308
 309 static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
 310 {
 311         struct iscsi_iser_task *iser_task = task->dd_data;
 312
 313         if (iser_task->dir[ISER_DIR_IN])
 314                 return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
 315                                                  sector);
 316         else
 317                 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
 318                                                  sector);
 319 }
 320
 321 static struct iscsi_cls_conn *
 322 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 323 {
 324         struct iscsi_conn *conn;
 325         struct iscsi_cls_conn *cls_conn;
 326
 327         cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
 328         if (!cls_conn)
 329                 return NULL;
 330         conn = cls_conn->dd_data;
 331
 332         /*
 333          * due to issues with the login code re iser sematics
 334          * this not set in iscsi_conn_setup - FIXME
 335          */
 336         conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
 337
 338         return cls_conn;
 339 }
 340
 341 static int
 342 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
 343                      struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
 344                      int is_leading)
 345 {
 346         struct iscsi_conn *conn = cls_conn->dd_data;
 347         struct iscsi_session *session;
 348         struct iser_conn *ib_conn;
 349         struct iscsi_endpoint *ep;
 350         int error;
 351
 352         error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 353         if (error)
 354                 return error;
 355
 356         /* the transport ep handle comes from user space so it must be
 357          * verified against the global ib connections list */
 358         ep = iscsi_lookup_endpoint(transport_eph);
 359         if (!ep) {
 360                 iser_err("can't bind eph %llx\n",
 361                          (unsigned long long)transport_eph);
 362                 return -EINVAL;
 363         }
 364         ib_conn = ep->dd_data;
 365
 366         session = conn->session;
 367         if (iser_alloc_rx_descriptors(ib_conn, session))
 368                 return -ENOMEM;
 369
 370         /* binds the iSER connection retrieved from the previously
 371          * connected ep_handle to the iSCSI layer connection. exchanges
 372          * connection pointers */
 373         iser_info("binding iscsi conn %p to ib_conn %p\n", conn, ib_conn);
 374
 375         conn->dd_data = ib_conn;
 376         ib_conn->iscsi_conn = conn;
 377
 378         return 0;
 379 }
 380
 381 static int
 382 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
 383 {
 384         struct iscsi_conn *iscsi_conn;
 385         struct iser_conn *ib_conn;
 386
 387         iscsi_conn = cls_conn->dd_data;
 388         ib_conn = iscsi_conn->dd_data;
 389         reinit_completion(&ib_conn->stop_completion);
 390
 391         return iscsi_conn_start(cls_conn);
 392 }
 393
 394 static void
 395 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
 396 {
 397         struct iscsi_conn *conn = cls_conn->dd_data;
 398         struct iser_conn *ib_conn = conn->dd_data;
 399
 400         iser_dbg("stopping iscsi_conn: %p, ib_conn: %p\n", conn, ib_conn);
 401         iscsi_conn_stop(cls_conn, flag);
 402
 403         /*
 404          * Userspace may have goofed up and not bound the connection or
 405          * might have only partially setup the connection.
 406          */
 407         if (ib_conn) {
 408                 conn->dd_data = NULL;
 409                 complete(&ib_conn->stop_completion);
 410         }
 411 }
 412
 413 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 414 {
 415         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 416
 417         iscsi_session_teardown(cls_session);
 418         iscsi_host_remove(shost);
 419         iscsi_host_free(shost);
 420 }
 421
 422 static inline unsigned int
 423 iser_dif_prot_caps(int prot_caps)
 424 {
 425         return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
 426                                                       SHOST_DIX_TYPE1_PROTECTION : 0) |
 427                ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
 428                                                       SHOST_DIX_TYPE2_PROTECTION : 0) |
 429                ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
 430                                                       SHOST_DIX_TYPE3_PROTECTION : 0);
 431 }
 432
 433 static struct iscsi_cls_session *
 434 iscsi_iser_session_create(struct iscsi_endpoint *ep,
 435                           uint16_t cmds_max, uint16_t qdepth,
 436                           uint32_t initial_cmdsn)
 437 {
 438         struct iscsi_cls_session *cls_session;
 439         struct iscsi_session *session;
 440         struct Scsi_Host *shost;
 441         struct iser_conn *ib_conn = NULL;
 442
 443         shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
 444         if (!shost)
 445                 return NULL;
 446         shost->transportt = iscsi_iser_scsi_transport;
 447         shost->cmd_per_lun = qdepth;
 448         shost->max_lun = iscsi_max_lun;
 449         shost->max_id = 0;
 450         shost->max_channel = 0;
 451         shost->max_cmd_len = 16;
 452
 453         /*
 454          * older userspace tools (before 2.0-870) did not pass us
 455          * the leading conn's ep so this will be NULL;
 456          */
 457         if (ep) {
 458                 ib_conn = ep->dd_data;
 459                 if (ib_conn->pi_support) {
 460                         u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
 461
 462                         scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
 463                         if (iser_pi_guard)
 464                                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 465                         else
 466                                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
 467                 }
 468         }
 469
 470         if (iscsi_host_add(shost,
 471                            ep ? ib_conn->device->ib_device->dma_device : NULL))
 472                 goto free_host;
 473
 474         if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
 475                 iser_info("cmds_max changed from %u to %u\n",
 476                           cmds_max, ISER_DEF_XMIT_CMDS_MAX);
 477                 cmds_max = ISER_DEF_XMIT_CMDS_MAX;
 478         }
 479
 480         cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
 481                                           cmds_max, 0,
 482                                           sizeof(struct iscsi_iser_task),
 483                                           initial_cmdsn, 0);
 484         if (!cls_session)
 485                 goto remove_host;
 486         session = cls_session->dd_data;
 487
 488         shost->can_queue = session->scsi_cmds_max;
 489         return cls_session;
 490
 491 remove_host:
 492         iscsi_host_remove(shost);
 493 free_host:
 494         iscsi_host_free(shost);
 495         return NULL;
 496 }
 497
 498 static int
 499 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
 500                      enum iscsi_param param, char *buf, int buflen)
 501 {
 502         int value;
 503
 504         switch (param) {
 505         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 506                 /* TBD */
 507                 break;
 508         case ISCSI_PARAM_HDRDGST_EN:
 509                 sscanf(buf, "%d", &value);
 510                 if (value) {
 511                         iser_err("DataDigest wasn't negotiated to None\n");
 512                         return -EPROTO;
 513                 }
 514                 break;
 515         case ISCSI_PARAM_DATADGST_EN:
 516                 sscanf(buf, "%d", &value);
 517                 if (value) {
 518                         iser_err("DataDigest wasn't negotiated to None\n");
 519                         return -EPROTO;
 520                 }
 521                 break;
 522         case ISCSI_PARAM_IFMARKER_EN:
 523                 sscanf(buf, "%d", &value);
 524                 if (value) {
 525                         iser_err("IFMarker wasn't negotiated to No\n");
 526                         return -EPROTO;
 527                 }
 528                 break;
 529         case ISCSI_PARAM_OFMARKER_EN:
 530                 sscanf(buf, "%d", &value);
 531                 if (value) {
 532                         iser_err("OFMarker wasn't negotiated to No\n");
 533                         return -EPROTO;
 534                 }
 535                 break;
 536         default:
 537                 return iscsi_set_param(cls_conn, param, buf, buflen);
 538         }
 539
 540         return 0;
 541 }
 542
 543 static void
 544 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 545 {
 546         struct iscsi_conn *conn = cls_conn->dd_data;
 547
 548         stats->txdata_octets = conn->txdata_octets;
 549         stats->rxdata_octets = conn->rxdata_octets;
 550         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 551         stats->dataout_pdus = conn->dataout_pdus_cnt;
 552         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 553         stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
 554         stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
 555         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 556         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 557         stats->custom_length = 4;
 558         strcpy(stats->custom[0].desc, "qp_tx_queue_full");
 559         stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
 560         strcpy(stats->custom[1].desc, "fmr_map_not_avail");
 561         stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
 562         strcpy(stats->custom[2].desc, "eh_abort_cnt");
 563         stats->custom[2].value = conn->eh_abort_cnt;
 564         strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
 565         stats->custom[3].value = conn->fmr_unalign_cnt;
 566 }
 567
 568 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
 569                                    enum iscsi_param param, char *buf)
 570 {
 571         struct iser_conn *ib_conn = ep->dd_data;
 572         int len;
 573
 574         switch (param) {
 575         case ISCSI_PARAM_CONN_PORT:
 576         case ISCSI_PARAM_CONN_ADDRESS:
 577                 if (!ib_conn || !ib_conn->cma_id)
 578                         return -ENOTCONN;
 579
 580                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
 581                                         &ib_conn->cma_id->route.addr.dst_addr,
 582                                         param, buf);
 583                 break;
 584         default:
 585                 return -ENOSYS;
 586         }
 587
 588         return len;
 589 }
 590
 591 static struct iscsi_endpoint *
 592 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
 593                       int non_blocking)
 594 {
 595         int err;
 596         struct iser_conn *ib_conn;
 597         struct iscsi_endpoint *ep;
 598
 599         ep = iscsi_create_endpoint(sizeof(*ib_conn));
 600         if (!ep)
 601                 return ERR_PTR(-ENOMEM);
 602
 603         ib_conn = ep->dd_data;
 604         ib_conn->ep = ep;
 605         iser_conn_init(ib_conn);
 606
 607         err = iser_connect(ib_conn, NULL, dst_addr, non_blocking);
 608         if (err)
 609                 return ERR_PTR(err);
 610
 611         return ep;
 612 }
 613
 614 static int
 615 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 616 {
 617         struct iser_conn *ib_conn;
 618         int rc;
 619
 620         ib_conn = ep->dd_data;
 621         rc = wait_event_interruptible_timeout(ib_conn->wait,
 622                              ib_conn->state == ISER_CONN_UP,
 623                              msecs_to_jiffies(timeout_ms));
 624
 625         /* if conn establishment failed, return error code to iscsi */
 626         if (!rc &&
 627             (ib_conn->state == ISER_CONN_TERMINATING ||
 628              ib_conn->state == ISER_CONN_DOWN))
 629                 rc = -1;
 630
 631         iser_info("ib conn %p rc = %d\n", ib_conn, rc);
 632
 633         if (rc > 0)
 634                 return 1; /* success, this is the equivalent of POLLOUT */
 635         else if (!rc)
 636                 return 0; /* timeout */
 637         else
 638                 return rc; /* signal */
 639 }
 640
 641 static void
 642 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 643 {
 644         struct iser_conn *ib_conn;
 645
 646         ib_conn = ep->dd_data;
 647         iser_info("ep %p ib conn %p state %d\n", ep, ib_conn, ib_conn->state);
 648         iser_conn_terminate(ib_conn);
 649
 650         /*
 651          * if iser_conn and iscsi_conn are bound, we must wait iscsi_conn_stop
 652          * call and ISER_CONN_DOWN state before freeing the iser resources.
 653          * otherwise we are safe to free resources immediately.
 654          */
 655         if (ib_conn->iscsi_conn) {
 656                 INIT_WORK(&ib_conn->release_work, iser_release_work);
 657                 queue_work(release_wq, &ib_conn->release_work);
 658         } else {
 659                 iser_conn_release(ib_conn);
 660         }
 661 }
 662
 663 static umode_t iser_attr_is_visible(int param_type, int param)
 664 {
 665         switch (param_type) {
 666         case ISCSI_HOST_PARAM:
 667                 switch (param) {
 668                 case ISCSI_HOST_PARAM_NETDEV_NAME:
 669                 case ISCSI_HOST_PARAM_HWADDRESS:
 670                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
 671                         return S_IRUGO;
 672                 default:
 673                         return 0;
 674                 }
 675         case ISCSI_PARAM:
 676                 switch (param) {
 677                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
 678                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 679                 case ISCSI_PARAM_HDRDGST_EN:
 680                 case ISCSI_PARAM_DATADGST_EN:
 681                 case ISCSI_PARAM_CONN_ADDRESS:
 682                 case ISCSI_PARAM_CONN_PORT:
 683                 case ISCSI_PARAM_EXP_STATSN:
 684                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
 685                 case ISCSI_PARAM_PERSISTENT_PORT:
 686                 case ISCSI_PARAM_PING_TMO:
 687                 case ISCSI_PARAM_RECV_TMO:
 688                 case ISCSI_PARAM_INITIAL_R2T_EN:
 689                 case ISCSI_PARAM_MAX_R2T:
 690                 case ISCSI_PARAM_IMM_DATA_EN:
 691                 case ISCSI_PARAM_FIRST_BURST:
 692                 case ISCSI_PARAM_MAX_BURST:
 693                 case ISCSI_PARAM_PDU_INORDER_EN:
 694                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
 695                 case ISCSI_PARAM_TARGET_NAME:
 696                 case ISCSI_PARAM_TPGT:
 697                 case ISCSI_PARAM_USERNAME:
 698                 case ISCSI_PARAM_PASSWORD:
 699                 case ISCSI_PARAM_USERNAME_IN:
 700                 case ISCSI_PARAM_PASSWORD_IN:
 701                 case ISCSI_PARAM_FAST_ABORT:
 702                 case ISCSI_PARAM_ABORT_TMO:
 703                 case ISCSI_PARAM_LU_RESET_TMO:
 704                 case ISCSI_PARAM_TGT_RESET_TMO:
 705                 case ISCSI_PARAM_IFACE_NAME:
 706                 case ISCSI_PARAM_INITIATOR_NAME:
 707                 case ISCSI_PARAM_DISCOVERY_SESS:
 708                         return S_IRUGO;
 709                 default:
 710                         return 0;
 711                 }
 712         }
 713
 714         return 0;
 715 }
 716
 717 static struct scsi_host_template iscsi_iser_sht = {
 718         .module                 = THIS_MODULE,
 719         .name                   = "iSCSI Initiator over iSER",
 720         .queuecommand           = iscsi_queuecommand,
 721         .change_queue_depth     = iscsi_change_queue_depth,
 722         .sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
 723         .max_sectors            = 1024,
 724         .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
 725         .eh_abort_handler       = iscsi_eh_abort,
 726         .eh_device_reset_handler= iscsi_eh_device_reset,
 727         .eh_target_reset_handler = iscsi_eh_recover_target,
 728         .target_alloc           = iscsi_target_alloc,
 729         .use_clustering         = DISABLE_CLUSTERING,
 730         .proc_name              = "iscsi_iser",
 731         .this_id                = -1,
 732 };
 733
 734 static struct iscsi_transport iscsi_iser_transport = {
 735         .owner                  = THIS_MODULE,
 736         .name                   = "iser",
 737         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
 738         /* session management */
 739         .create_session         = iscsi_iser_session_create,
 740         .destroy_session        = iscsi_iser_session_destroy,
 741         /* connection management */
 742         .create_conn            = iscsi_iser_conn_create,
 743         .bind_conn              = iscsi_iser_conn_bind,
 744         .destroy_conn           = iscsi_conn_teardown,
 745         .attr_is_visible        = iser_attr_is_visible,
 746         .set_param              = iscsi_iser_set_param,
 747         .get_conn_param         = iscsi_conn_get_param,
 748         .get_ep_param           = iscsi_iser_get_ep_param,
 749         .get_session_param      = iscsi_session_get_param,
 750         .start_conn             = iscsi_iser_conn_start,
 751         .stop_conn              = iscsi_iser_conn_stop,
 752         /* iscsi host params */
 753         .get_host_param         = iscsi_host_get_param,
 754         .set_host_param         = iscsi_host_set_param,
 755         /* IO */
 756         .send_pdu               = iscsi_conn_send_pdu,
 757         .get_stats              = iscsi_iser_conn_get_stats,
 758         .init_task              = iscsi_iser_task_init,
 759         .xmit_task              = iscsi_iser_task_xmit,
 760         .cleanup_task           = iscsi_iser_cleanup_task,
 761         .alloc_pdu              = iscsi_iser_pdu_alloc,
 762         .check_protection       = iscsi_iser_check_protection,
 763         /* recovery */
 764         .session_recovery_timedout = iscsi_session_recovery_timedout,
 765
 766         .ep_connect             = iscsi_iser_ep_connect,
 767         .ep_poll                = iscsi_iser_ep_poll,
 768         .ep_disconnect          = iscsi_iser_ep_disconnect
 769 };
 770
 771 static int __init iser_init(void)
 772 {
 773         int err;
 774
 775         iser_dbg("Starting iSER datamover...\n");
 776
 777         if (iscsi_max_lun < 1) {
 778                 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
 779                 return -EINVAL;
 780         }
 781
 782         memset(&ig, 0, sizeof(struct iser_global));
 783
 784         ig.desc_cache = kmem_cache_create("iser_descriptors",
 785                                           sizeof(struct iser_tx_desc),
 786                                           0, SLAB_HWCACHE_ALIGN,
 787                                           NULL);
 788         if (ig.desc_cache == NULL)
 789                 return -ENOMEM;
 790
 791         /* device init is called only after the first addr resolution */
 792         mutex_init(&ig.device_list_mutex);
 793         INIT_LIST_HEAD(&ig.device_list);
 794         mutex_init(&ig.connlist_mutex);
 795         INIT_LIST_HEAD(&ig.connlist);
 796
 797         release_wq = alloc_workqueue("release workqueue", 0, 0);
 798         if (!release_wq) {
 799                 iser_err("failed to allocate release workqueue\n");
 800                 return -ENOMEM;
 801         }
 802
 803         iscsi_iser_scsi_transport = iscsi_register_transport(
 804                                                         &iscsi_iser_transport);
 805         if (!iscsi_iser_scsi_transport) {
 806                 iser_err("iscsi_register_transport failed\n");
 807                 err = -EINVAL;
 808                 goto register_transport_failure;
 809         }
 810
 811         return 0;
 812
 813 register_transport_failure:
 814         kmem_cache_destroy(ig.desc_cache);
 815
 816         return err;
 817 }
 818
 819 static void __exit iser_exit(void)
 820 {
 821         struct iser_conn *ib_conn, *n;
 822         int connlist_empty;
 823
 824         iser_dbg("Removing iSER datamover...\n");
 825         destroy_workqueue(release_wq);
 826
 827         mutex_lock(&ig.connlist_mutex);
 828         connlist_empty = list_empty(&ig.connlist);
 829         mutex_unlock(&ig.connlist_mutex);
 830
 831         if (!connlist_empty) {
 832                 iser_err("Error cleanup stage completed but we still have iser "
 833                          "connections, destroying them anyway.\n");
 834                 list_for_each_entry_safe(ib_conn, n, &ig.connlist, conn_list) {
 835                         iser_conn_release(ib_conn);
 836                 }
 837         }
 838
 839         iscsi_unregister_transport(&iscsi_iser_transport);
 840         kmem_cache_destroy(ig.desc_cache);
 841 }
 842
 843 module_init(iser_init);
 844 module_exit(iser_exit);