drivers/infiniband/ulp/srp/ib_srp.c

   1 /*
   2  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/err.h>
  39 #include <linux/string.h>
  40 #include <linux/parser.h>
  41 #include <linux/random.h>
  42 #include <linux/jiffies.h>
  43
  44 #include <asm/atomic.h>
  45
  46 #include <scsi/scsi.h>
  47 #include <scsi/scsi_device.h>
  48 #include <scsi/scsi_dbg.h>
  49 #include <scsi/srp.h>
  50 #include <scsi/scsi_transport_srp.h>
  51
  52 #include "ib_srp.h"
  53
  54 #define DRV_NAME        "ib_srp"
  55 #define PFX             DRV_NAME ": "
  56 #define DRV_VERSION     "0.2"
  57 #define DRV_RELDATE     "November 1, 2005"
  58
  59 MODULE_AUTHOR("Roland Dreier");
  60 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
  61                    "v" DRV_VERSION " (" DRV_RELDATE ")");
  62 MODULE_LICENSE("Dual BSD/GPL");
  63
  64 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
  65 static int srp_max_iu_len;
  66
  67 module_param(srp_sg_tablesize, int, 0444);
  68 MODULE_PARM_DESC(srp_sg_tablesize,
  69                  "Max number of gather/scatter entries per I/O (default is 12, max 255)");
  70
  71 static int topspin_workarounds = 1;
  72
  73 module_param(topspin_workarounds, int, 0444);
  74 MODULE_PARM_DESC(topspin_workarounds,
  75                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  76
  77 static int mellanox_workarounds = 1;
  78
  79 module_param(mellanox_workarounds, int, 0444);
  80 MODULE_PARM_DESC(mellanox_workarounds,
  81                  "Enable workarounds for Mellanox SRP target bugs if != 0");
  82
  83 static void srp_add_one(struct ib_device *device);
  84 static void srp_remove_one(struct ib_device *device);
  85 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  86 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  87
  88 static struct scsi_transport_template *ib_srp_transport_template;
  89
  90 static struct ib_client srp_client = {
  91         .name   = "srp",
  92         .add    = srp_add_one,
  93         .remove = srp_remove_one
  94 };
  95
  96 static struct ib_sa_client srp_sa_client;
  97
  98 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
  99 {
 100         return (struct srp_target_port *) host->hostdata;
 101 }
 102
 103 static const char *srp_target_info(struct Scsi_Host *host)
 104 {
 105         return host_to_target(host)->target_name;
 106 }
 107
 108 static int srp_target_is_topspin(struct srp_target_port *target)
 109 {
 110         static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
 111         static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
 112
 113         return topspin_workarounds &&
 114                 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
 115                  !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
 116 }
 117
 118 static int srp_target_is_mellanox(struct srp_target_port *target)
 119 {
 120         static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
 121
 122         return mellanox_workarounds &&
 123                 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
 124 }
 125
 126 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 127                                    gfp_t gfp_mask,
 128                                    enum dma_data_direction direction)
 129 {
 130         struct srp_iu *iu;
 131
 132         iu = kmalloc(sizeof *iu, gfp_mask);
 133         if (!iu)
 134                 goto out;
 135
 136         iu->buf = kzalloc(size, gfp_mask);
 137         if (!iu->buf)
 138                 goto out_free_iu;
 139
 140         iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
 141                                     direction);
 142         if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
 143                 goto out_free_buf;
 144
 145         iu->size      = size;
 146         iu->direction = direction;
 147
 148         return iu;
 149
 150 out_free_buf:
 151         kfree(iu->buf);
 152 out_free_iu:
 153         kfree(iu);
 154 out:
 155         return NULL;
 156 }
 157
 158 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 159 {
 160         if (!iu)
 161                 return;
 162
 163         ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
 164                             iu->direction);
 165         kfree(iu->buf);
 166         kfree(iu);
 167 }
 168
 169 static void srp_qp_event(struct ib_event *event, void *context)
 170 {
 171         printk(KERN_ERR PFX "QP event %d\n", event->event);
 172 }
 173
 174 static int srp_init_qp(struct srp_target_port *target,
 175                        struct ib_qp *qp)
 176 {
 177         struct ib_qp_attr *attr;
 178         int ret;
 179
 180         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 181         if (!attr)
 182                 return -ENOMEM;
 183
 184         ret = ib_find_pkey(target->srp_host->srp_dev->dev,
 185                            target->srp_host->port,
 186                            be16_to_cpu(target->path.pkey),
 187                            &attr->pkey_index);
 188         if (ret)
 189                 goto out;
 190
 191         attr->qp_state        = IB_QPS_INIT;
 192         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 193                                     IB_ACCESS_REMOTE_WRITE);
 194         attr->port_num        = target->srp_host->port;
 195
 196         ret = ib_modify_qp(qp, attr,
 197                            IB_QP_STATE          |
 198                            IB_QP_PKEY_INDEX     |
 199                            IB_QP_ACCESS_FLAGS   |
 200                            IB_QP_PORT);
 201
 202 out:
 203         kfree(attr);
 204         return ret;
 205 }
 206
 207 static int srp_new_cm_id(struct srp_target_port *target)
 208 {
 209         struct ib_cm_id *new_cm_id;
 210
 211         new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
 212                                     srp_cm_handler, target);
 213         if (IS_ERR(new_cm_id))
 214                 return PTR_ERR(new_cm_id);
 215
 216         if (target->cm_id)
 217                 ib_destroy_cm_id(target->cm_id);
 218         target->cm_id = new_cm_id;
 219
 220         return 0;
 221 }
 222
 223 static int srp_create_target_ib(struct srp_target_port *target)
 224 {
 225         struct ib_qp_init_attr *init_attr;
 226         int ret;
 227
 228         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 229         if (!init_attr)
 230                 return -ENOMEM;
 231
 232         target->cq = ib_create_cq(target->srp_host->srp_dev->dev,
 233                                   srp_completion, NULL, target, SRP_CQ_SIZE, 0);
 234         if (IS_ERR(target->cq)) {
 235                 ret = PTR_ERR(target->cq);
 236                 goto out;
 237         }
 238
 239         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 240
 241         init_attr->event_handler       = srp_qp_event;
 242         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 243         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 244         init_attr->cap.max_recv_sge    = 1;
 245         init_attr->cap.max_send_sge    = 1;
 246         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 247         init_attr->qp_type             = IB_QPT_RC;
 248         init_attr->send_cq             = target->cq;
 249         init_attr->recv_cq             = target->cq;
 250
 251         target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
 252         if (IS_ERR(target->qp)) {
 253                 ret = PTR_ERR(target->qp);
 254                 ib_destroy_cq(target->cq);
 255                 goto out;
 256         }
 257
 258         ret = srp_init_qp(target, target->qp);
 259         if (ret) {
 260                 ib_destroy_qp(target->qp);
 261                 ib_destroy_cq(target->cq);
 262                 goto out;
 263         }
 264
 265 out:
 266         kfree(init_attr);
 267         return ret;
 268 }
 269
 270 static void srp_free_target_ib(struct srp_target_port *target)
 271 {
 272         int i;
 273
 274         ib_destroy_qp(target->qp);
 275         ib_destroy_cq(target->cq);
 276
 277         for (i = 0; i < SRP_RQ_SIZE; ++i)
 278                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 279         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 280                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 281 }
 282
 283 static void srp_path_rec_completion(int status,
 284                                     struct ib_sa_path_rec *pathrec,
 285                                     void *target_ptr)
 286 {
 287         struct srp_target_port *target = target_ptr;
 288
 289         target->status = status;
 290         if (status)
 291                 shost_printk(KERN_ERR, target->scsi_host,
 292                              PFX "Got failed path rec status %d\n", status);
 293         else
 294                 target->path = *pathrec;
 295         complete(&target->done);
 296 }
 297
 298 static int srp_lookup_path(struct srp_target_port *target)
 299 {
 300         target->path.numb_path = 1;
 301
 302         init_completion(&target->done);
 303
 304         target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
 305                                                    target->srp_host->srp_dev->dev,
 306                                                    target->srp_host->port,
 307                                                    &target->path,
 308                                                    IB_SA_PATH_REC_SERVICE_ID    |
 309                                                    IB_SA_PATH_REC_DGID          |
 310                                                    IB_SA_PATH_REC_SGID          |
 311                                                    IB_SA_PATH_REC_NUMB_PATH     |
 312                                                    IB_SA_PATH_REC_PKEY,
 313                                                    SRP_PATH_REC_TIMEOUT_MS,
 314                                                    GFP_KERNEL,
 315                                                    srp_path_rec_completion,
 316                                                    target, &target->path_query);
 317         if (target->path_query_id < 0)
 318                 return target->path_query_id;
 319
 320         wait_for_completion(&target->done);
 321
 322         if (target->status < 0)
 323                 shost_printk(KERN_WARNING, target->scsi_host,
 324                              PFX "Path record query failed\n");
 325
 326         return target->status;
 327 }
 328
 329 static int srp_send_req(struct srp_target_port *target)
 330 {
 331         struct {
 332                 struct ib_cm_req_param param;
 333                 struct srp_login_req   priv;
 334         } *req = NULL;
 335         int status;
 336
 337         req = kzalloc(sizeof *req, GFP_KERNEL);
 338         if (!req)
 339                 return -ENOMEM;
 340
 341         req->param.primary_path               = &target->path;
 342         req->param.alternate_path             = NULL;
 343         req->param.service_id                 = target->service_id;
 344         req->param.qp_num                     = target->qp->qp_num;
 345         req->param.qp_type                    = target->qp->qp_type;
 346         req->param.private_data               = &req->priv;
 347         req->param.private_data_len           = sizeof req->priv;
 348         req->param.flow_control               = 1;
 349
 350         get_random_bytes(&req->param.starting_psn, 4);
 351         req->param.starting_psn              &= 0xffffff;
 352
 353         /*
 354          * Pick some arbitrary defaults here; we could make these
 355          * module parameters if anyone cared about setting them.
 356          */
 357         req->param.responder_resources        = 4;
 358         req->param.remote_cm_response_timeout = 20;
 359         req->param.local_cm_response_timeout  = 20;
 360         req->param.retry_count                = 7;
 361         req->param.rnr_retry_count            = 7;
 362         req->param.max_cm_retries             = 15;
 363
 364         req->priv.opcode        = SRP_LOGIN_REQ;
 365         req->priv.tag           = 0;
 366         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 367         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 368                                               SRP_BUF_FORMAT_INDIRECT);
 369         /*
 370          * In the published SRP specification (draft rev. 16a), the
 371          * port identifier format is 8 bytes of ID extension followed
 372          * by 8 bytes of GUID.  Older drafts put the two halves in the
 373          * opposite order, so that the GUID comes first.
 374          *
 375          * Targets conforming to these obsolete drafts can be
 376          * recognized by the I/O Class they report.
 377          */
 378         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 379                 memcpy(req->priv.initiator_port_id,
 380                        &target->path.sgid.global.interface_id, 8);
 381                 memcpy(req->priv.initiator_port_id + 8,
 382                        &target->initiator_ext, 8);
 383                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 384                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 385         } else {
 386                 memcpy(req->priv.initiator_port_id,
 387                        &target->initiator_ext, 8);
 388                 memcpy(req->priv.initiator_port_id + 8,
 389                        &target->path.sgid.global.interface_id, 8);
 390                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 391                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 392         }
 393
 394         /*
 395          * Topspin/Cisco SRP targets will reject our login unless we
 396          * zero out the first 8 bytes of our initiator port ID and set
 397          * the second 8 bytes to the local node GUID.
 398          */
 399         if (srp_target_is_topspin(target)) {
 400                 shost_printk(KERN_DEBUG, target->scsi_host,
 401                              PFX "Topspin/Cisco initiator port ID workaround "
 402                              "activated for target GUID %016llx\n",
 403                              (unsigned long long) be64_to_cpu(target->ioc_guid));
 404                 memset(req->priv.initiator_port_id, 0, 8);
 405                 memcpy(req->priv.initiator_port_id + 8,
 406                        &target->srp_host->srp_dev->dev->node_guid, 8);
 407         }
 408
 409         status = ib_send_cm_req(target->cm_id, &req->param);
 410
 411         kfree(req);
 412
 413         return status;
 414 }
 415
 416 static void srp_disconnect_target(struct srp_target_port *target)
 417 {
 418         /* XXX should send SRP_I_LOGOUT request */
 419
 420         init_completion(&target->done);
 421         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 422                 shost_printk(KERN_DEBUG, target->scsi_host,
 423                              PFX "Sending CM DREQ failed\n");
 424                 return;
 425         }
 426         wait_for_completion(&target->done);
 427 }
 428
 429 static void srp_remove_work(struct work_struct *work)
 430 {
 431         struct srp_target_port *target =
 432                 container_of(work, struct srp_target_port, work);
 433
 434         spin_lock_irq(target->scsi_host->host_lock);
 435         if (target->state != SRP_TARGET_DEAD) {
 436                 spin_unlock_irq(target->scsi_host->host_lock);
 437                 return;
 438         }
 439         target->state = SRP_TARGET_REMOVED;
 440         spin_unlock_irq(target->scsi_host->host_lock);
 441
 442         spin_lock(&target->srp_host->target_lock);
 443         list_del(&target->list);
 444         spin_unlock(&target->srp_host->target_lock);
 445
 446         srp_remove_host(target->scsi_host);
 447         scsi_remove_host(target->scsi_host);
 448         ib_destroy_cm_id(target->cm_id);
 449         srp_free_target_ib(target);
 450         scsi_host_put(target->scsi_host);
 451 }
 452
 453 static int srp_connect_target(struct srp_target_port *target)
 454 {
 455         int retries = 3;
 456         int ret;
 457
 458         ret = srp_lookup_path(target);
 459         if (ret)
 460                 return ret;
 461
 462         while (1) {
 463                 init_completion(&target->done);
 464                 ret = srp_send_req(target);
 465                 if (ret)
 466                         return ret;
 467                 wait_for_completion(&target->done);
 468
 469                 /*
 470                  * The CM event handling code will set status to
 471                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 472                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 473                  * redirect REJ back.
 474                  */
 475                 switch (target->status) {
 476                 case 0:
 477                         return 0;
 478
 479                 case SRP_PORT_REDIRECT:
 480                         ret = srp_lookup_path(target);
 481                         if (ret)
 482                                 return ret;
 483                         break;
 484
 485                 case SRP_DLID_REDIRECT:
 486                         break;
 487
 488                 case SRP_STALE_CONN:
 489                         /* Our current CM id was stale, and is now in timewait.
 490                          * Try to reconnect with a new one.
 491                          */
 492                         if (!retries-- || srp_new_cm_id(target)) {
 493                                 shost_printk(KERN_ERR, target->scsi_host, PFX
 494                                              "giving up on stale connection\n");
 495                                 target->status = -ECONNRESET;
 496                                 return target->status;
 497                         }
 498
 499                         shost_printk(KERN_ERR, target->scsi_host, PFX
 500                                      "retrying stale connection\n");
 501                         break;
 502
 503                 default:
 504                         return target->status;
 505                 }
 506         }
 507 }
 508
 509 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 510                            struct srp_target_port *target,
 511                            struct srp_request *req)
 512 {
 513         if (!scsi_sglist(scmnd) ||
 514             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 515              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 516                 return;
 517
 518         if (req->fmr) {
 519                 ib_fmr_pool_unmap(req->fmr);
 520                 req->fmr = NULL;
 521         }
 522
 523         ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
 524                         scsi_sg_count(scmnd), scmnd->sc_data_direction);
 525 }
 526
 527 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 528 {
 529         srp_unmap_data(req->scmnd, target, req);
 530         list_move_tail(&req->list, &target->free_reqs);
 531 }
 532
 533 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 534 {
 535         req->scmnd->result = DID_RESET << 16;
 536         req->scmnd->scsi_done(req->scmnd);
 537         srp_remove_req(target, req);
 538 }
 539
 540 static int srp_reconnect_target(struct srp_target_port *target)
 541 {
 542         struct ib_qp_attr qp_attr;
 543         struct srp_request *req, *tmp;
 544         struct ib_wc wc;
 545         int ret;
 546
 547         spin_lock_irq(target->scsi_host->host_lock);
 548         if (target->state != SRP_TARGET_LIVE) {
 549                 spin_unlock_irq(target->scsi_host->host_lock);
 550                 return -EAGAIN;
 551         }
 552         target->state = SRP_TARGET_CONNECTING;
 553         spin_unlock_irq(target->scsi_host->host_lock);
 554
 555         srp_disconnect_target(target);
 556         /*
 557          * Now get a new local CM ID so that we avoid confusing the
 558          * target in case things are really fouled up.
 559          */
 560         ret = srp_new_cm_id(target);
 561         if (ret)
 562                 goto err;
 563
 564         qp_attr.qp_state = IB_QPS_RESET;
 565         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 566         if (ret)
 567                 goto err;
 568
 569         ret = srp_init_qp(target, target->qp);
 570         if (ret)
 571                 goto err;
 572
 573         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 574                 ; /* nothing */
 575
 576         spin_lock_irq(target->scsi_host->host_lock);
 577         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 578                 srp_reset_req(target, req);
 579         spin_unlock_irq(target->scsi_host->host_lock);
 580
 581         target->rx_head  = 0;
 582         target->tx_head  = 0;
 583         target->tx_tail  = 0;
 584
 585         target->qp_in_error = 0;
 586         ret = srp_connect_target(target);
 587         if (ret)
 588                 goto err;
 589
 590         spin_lock_irq(target->scsi_host->host_lock);
 591         if (target->state == SRP_TARGET_CONNECTING) {
 592                 ret = 0;
 593                 target->state = SRP_TARGET_LIVE;
 594         } else
 595                 ret = -EAGAIN;
 596         spin_unlock_irq(target->scsi_host->host_lock);
 597
 598         return ret;
 599
 600 err:
 601         shost_printk(KERN_ERR, target->scsi_host,
 602                      PFX "reconnect failed (%d), removing target port.\n", ret);
 603
 604         /*
 605          * We couldn't reconnect, so kill our target port off.
 606          * However, we have to defer the real removal because we might
 607          * be in the context of the SCSI error handler now, which
 608          * would deadlock if we call scsi_remove_host().
 609          */
 610         spin_lock_irq(target->scsi_host->host_lock);
 611         if (target->state == SRP_TARGET_CONNECTING) {
 612                 target->state = SRP_TARGET_DEAD;
 613                 INIT_WORK(&target->work, srp_remove_work);
 614                 schedule_work(&target->work);
 615         }
 616         spin_unlock_irq(target->scsi_host->host_lock);
 617
 618         return ret;
 619 }
 620
 621 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 622                        int sg_cnt, struct srp_request *req,
 623                        struct srp_direct_buf *buf)
 624 {
 625         u64 io_addr = 0;
 626         u64 *dma_pages;
 627         u32 len;
 628         int page_cnt;
 629         int i, j;
 630         int ret;
 631         struct srp_device *dev = target->srp_host->srp_dev;
 632         struct ib_device *ibdev = dev->dev;
 633         struct scatterlist *sg;
 634
 635         if (!dev->fmr_pool)
 636                 return -ENODEV;
 637
 638         if (srp_target_is_mellanox(target) &&
 639             (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
 640                 return -EINVAL;
 641
 642         len = page_cnt = 0;
 643         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 644                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 645
 646                 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
 647                         if (i > 0)
 648                                 return -EINVAL;
 649                         else
 650                                 ++page_cnt;
 651                 }
 652                 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
 653                     ~dev->fmr_page_mask) {
 654                         if (i < sg_cnt - 1)
 655                                 return -EINVAL;
 656                         else
 657                                 ++page_cnt;
 658                 }
 659
 660                 len += dma_len;
 661         }
 662
 663         page_cnt += len >> dev->fmr_page_shift;
 664         if (page_cnt > SRP_FMR_SIZE)
 665                 return -ENOMEM;
 666
 667         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 668         if (!dma_pages)
 669                 return -ENOMEM;
 670
 671         page_cnt = 0;
 672         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 673                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 674
 675                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 676                         dma_pages[page_cnt++] =
 677                                 (ib_sg_dma_address(ibdev, sg) &
 678                                  dev->fmr_page_mask) + j;
 679         }
 680
 681         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 682                                         dma_pages, page_cnt, io_addr);
 683         if (IS_ERR(req->fmr)) {
 684                 ret = PTR_ERR(req->fmr);
 685                 req->fmr = NULL;
 686                 goto out;
 687         }
 688
 689         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 690                                ~dev->fmr_page_mask);
 691         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 692         buf->len = cpu_to_be32(len);
 693
 694         ret = 0;
 695
 696 out:
 697         kfree(dma_pages);
 698
 699         return ret;
 700 }
 701
 702 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 703                         struct srp_request *req)
 704 {
 705         struct scatterlist *scat;
 706         struct srp_cmd *cmd = req->cmd->buf;
 707         int len, nents, count;
 708         u8 fmt = SRP_DATA_DESC_DIRECT;
 709         struct srp_device *dev;
 710         struct ib_device *ibdev;
 711
 712         if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
 713                 return sizeof (struct srp_cmd);
 714
 715         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 716             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 717                 shost_printk(KERN_WARNING, target->scsi_host,
 718                              PFX "Unhandled data direction %d\n",
 719                              scmnd->sc_data_direction);
 720                 return -EINVAL;
 721         }
 722
 723         nents = scsi_sg_count(scmnd);
 724         scat  = scsi_sglist(scmnd);
 725
 726         dev = target->srp_host->srp_dev;
 727         ibdev = dev->dev;
 728
 729         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 730
 731         fmt = SRP_DATA_DESC_DIRECT;
 732         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 733
 734         if (count == 1) {
 735                 /*
 736                  * The midlayer only generated a single gather/scatter
 737                  * entry, or DMA mapping coalesced everything to a
 738                  * single entry.  So a direct descriptor along with
 739                  * the DMA MR suffices.
 740                  */
 741                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 742
 743                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 744                 buf->key = cpu_to_be32(dev->mr->rkey);
 745                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 746         } else if (srp_map_fmr(target, scat, count, req,
 747                                (void *) cmd->add_data)) {
 748                 /*
 749                  * FMR mapping failed, and the scatterlist has more
 750                  * than one entry.  Generate an indirect memory
 751                  * descriptor.
 752                  */
 753                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 754                 struct scatterlist *sg;
 755                 u32 datalen = 0;
 756                 int i;
 757
 758                 fmt = SRP_DATA_DESC_INDIRECT;
 759                 len = sizeof (struct srp_cmd) +
 760                         sizeof (struct srp_indirect_buf) +
 761                         count * sizeof (struct srp_direct_buf);
 762
 763                 scsi_for_each_sg(scmnd, sg, count, i) {
 764                         unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 765
 766                         buf->desc_list[i].va  =
 767                                 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
 768                         buf->desc_list[i].key =
 769                                 cpu_to_be32(dev->mr->rkey);
 770                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 771                         datalen += dma_len;
 772                 }
 773
 774                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 775                         cmd->data_out_desc_cnt = count;
 776                 else
 777                         cmd->data_in_desc_cnt = count;
 778
 779                 buf->table_desc.va  =
 780                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 781                 buf->table_desc.key =
 782                         cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
 783                 buf->table_desc.len =
 784                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 785
 786                 buf->len = cpu_to_be32(datalen);
 787         }
 788
 789         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 790                 cmd->buf_fmt = fmt << 4;
 791         else
 792                 cmd->buf_fmt = fmt;
 793
 794         return len;
 795 }
 796
 797 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 798 {
 799         struct srp_request *req;
 800         struct scsi_cmnd *scmnd;
 801         unsigned long flags;
 802         s32 delta;
 803
 804         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 805
 806         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 807
 808         target->req_lim += delta;
 809
 810         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 811
 812         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 813                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 814                         req->tsk_status = -1;
 815                 else
 816                         req->tsk_status = rsp->data[3];
 817                 complete(&req->done);
 818         } else {
 819                 scmnd = req->scmnd;
 820                 if (!scmnd)
 821                         shost_printk(KERN_ERR, target->scsi_host,
 822                                      "Null scmnd for RSP w/tag %016llx\n",
 823                                      (unsigned long long) rsp->tag);
 824                 scmnd->result = rsp->status;
 825
 826                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 827                         memcpy(scmnd->sense_buffer, rsp->data +
 828                                be32_to_cpu(rsp->resp_data_len),
 829                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 830                                      SCSI_SENSE_BUFFERSIZE));
 831                 }
 832
 833                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 834                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 835                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 836                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 837
 838                 if (!req->tsk_mgmt) {
 839                         scmnd->host_scribble = (void *) -1L;
 840                         scmnd->scsi_done(scmnd);
 841
 842                         srp_remove_req(target, req);
 843                 } else
 844                         req->cmd_done = 1;
 845         }
 846
 847         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 848 }
 849
 850 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 851 {
 852         struct ib_device *dev;
 853         struct srp_iu *iu;
 854         u8 opcode;
 855
 856         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 857
 858         dev = target->srp_host->srp_dev->dev;
 859         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 860                                    DMA_FROM_DEVICE);
 861
 862         opcode = *(u8 *) iu->buf;
 863
 864         if (0) {
 865                 int i;
 866
 867                 shost_printk(KERN_ERR, target->scsi_host,
 868                              PFX "recv completion, opcode 0x%02x\n", opcode);
 869
 870                 for (i = 0; i < wc->byte_len; ++i) {
 871                         if (i % 8 == 0)
 872                                 printk(KERN_ERR "  [%02x] ", i);
 873                         printk(" %02x", ((u8 *) iu->buf)[i]);
 874                         if ((i + 1) % 8 == 0)
 875                                 printk("\n");
 876                 }
 877
 878                 if (wc->byte_len % 8)
 879                         printk("\n");
 880         }
 881
 882         switch (opcode) {
 883         case SRP_RSP:
 884                 srp_process_rsp(target, iu->buf);
 885                 break;
 886
 887         case SRP_T_LOGOUT:
 888                 /* XXX Handle target logout */
 889                 shost_printk(KERN_WARNING, target->scsi_host,
 890                              PFX "Got target logout request\n");
 891                 break;
 892
 893         default:
 894                 shost_printk(KERN_WARNING, target->scsi_host,
 895                              PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 896                 break;
 897         }
 898
 899         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 900                                       DMA_FROM_DEVICE);
 901 }
 902
 903 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 904 {
 905         struct srp_target_port *target = target_ptr;
 906         struct ib_wc wc;
 907
 908         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 909         while (ib_poll_cq(cq, 1, &wc) > 0) {
 910                 if (wc.status) {
 911                         shost_printk(KERN_ERR, target->scsi_host,
 912                                      PFX "failed %s status %d\n",
 913                                      wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 914                                      wc.status);
 915                         target->qp_in_error = 1;
 916                         break;
 917                 }
 918
 919                 if (wc.wr_id & SRP_OP_RECV)
 920                         srp_handle_recv(target, &wc);
 921                 else
 922                         ++target->tx_tail;
 923         }
 924 }
 925
 926 static int __srp_post_recv(struct srp_target_port *target)
 927 {
 928         struct srp_iu *iu;
 929         struct ib_sge list;
 930         struct ib_recv_wr wr, *bad_wr;
 931         unsigned int next;
 932         int ret;
 933
 934         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 935         wr.wr_id = next | SRP_OP_RECV;
 936         iu       = target->rx_ring[next];
 937
 938         list.addr   = iu->dma;
 939         list.length = iu->size;
 940         list.lkey   = target->srp_host->srp_dev->mr->lkey;
 941
 942         wr.next     = NULL;
 943         wr.sg_list  = &list;
 944         wr.num_sge  = 1;
 945
 946         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 947         if (!ret)
 948                 ++target->rx_head;
 949
 950         return ret;
 951 }
 952
 953 static int srp_post_recv(struct srp_target_port *target)
 954 {
 955         unsigned long flags;
 956         int ret;
 957
 958         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 959         ret = __srp_post_recv(target);
 960         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 961
 962         return ret;
 963 }
 964
 965 /*
 966  * Must be called with target->scsi_host->host_lock held to protect
 967  * req_lim and tx_head.  Lock cannot be dropped between call here and
 968  * call to __srp_post_send().
 969  */
 970 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
 971                                         enum srp_request_type req_type)
 972 {
 973         s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
 974
 975         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 976                 return NULL;
 977
 978         if (target->req_lim < min) {
 979                 ++target->zero_req_lim;
 980                 return NULL;
 981         }
 982
 983         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 984 }
 985
 986 /*
 987  * Must be called with target->scsi_host->host_lock held to protect
 988  * req_lim and tx_head.
 989  */
 990 static int __srp_post_send(struct srp_target_port *target,
 991                            struct srp_iu *iu, int len)
 992 {
 993         struct ib_sge list;
 994         struct ib_send_wr wr, *bad_wr;
 995         int ret = 0;
 996
 997         list.addr   = iu->dma;
 998         list.length = len;
 999         list.lkey   = target->srp_host->srp_dev->mr->lkey;
1000
1001         wr.next       = NULL;
1002         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
1003         wr.sg_list    = &list;
1004         wr.num_sge    = 1;
1005         wr.opcode     = IB_WR_SEND;
1006         wr.send_flags = IB_SEND_SIGNALED;
1007
1008         ret = ib_post_send(target->qp, &wr, &bad_wr);
1009
1010         if (!ret) {
1011                 ++target->tx_head;
1012                 --target->req_lim;
1013         }
1014
1015         return ret;
1016 }
1017
1018 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1019                             void (*done)(struct scsi_cmnd *))
1020 {
1021         struct srp_target_port *target = host_to_target(scmnd->device->host);
1022         struct srp_request *req;
1023         struct srp_iu *iu;
1024         struct srp_cmd *cmd;
1025         struct ib_device *dev;
1026         int len;
1027
1028         if (target->state == SRP_TARGET_CONNECTING)
1029                 goto err;
1030
1031         if (target->state == SRP_TARGET_DEAD ||
1032             target->state == SRP_TARGET_REMOVED) {
1033                 scmnd->result = DID_BAD_TARGET << 16;
1034                 done(scmnd);
1035                 return 0;
1036         }
1037
1038         iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1039         if (!iu)
1040                 goto err;
1041
1042         dev = target->srp_host->srp_dev->dev;
1043         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1044                                    DMA_TO_DEVICE);
1045
1046         req = list_entry(target->free_reqs.next, struct srp_request, list);
1047
1048         scmnd->scsi_done     = done;
1049         scmnd->result        = 0;
1050         scmnd->host_scribble = (void *) (long) req->index;
1051
1052         cmd = iu->buf;
1053         memset(cmd, 0, sizeof *cmd);
1054
1055         cmd->opcode = SRP_CMD;
1056         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1057         cmd->tag    = req->index;
1058         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1059
1060         req->scmnd    = scmnd;
1061         req->cmd      = iu;
1062         req->cmd_done = 0;
1063         req->tsk_mgmt = NULL;
1064
1065         len = srp_map_data(scmnd, target, req);
1066         if (len < 0) {
1067                 shost_printk(KERN_ERR, target->scsi_host,
1068                              PFX "Failed to map data\n");
1069                 goto err;
1070         }
1071
1072         if (__srp_post_recv(target)) {
1073                 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1074                 goto err_unmap;
1075         }
1076
1077         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1078                                       DMA_TO_DEVICE);
1079
1080         if (__srp_post_send(target, iu, len)) {
1081                 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1082                 goto err_unmap;
1083         }
1084
1085         list_move_tail(&req->list, &target->req_queue);
1086
1087         return 0;
1088
1089 err_unmap:
1090         srp_unmap_data(scmnd, target, req);
1091
1092 err:
1093         return SCSI_MLQUEUE_HOST_BUSY;
1094 }
1095
1096 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1097 {
1098         int i;
1099
1100         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1101                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1102                                                   target->max_ti_iu_len,
1103                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1104                 if (!target->rx_ring[i])
1105                         goto err;
1106         }
1107
1108         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1109                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1110                                                   srp_max_iu_len,
1111                                                   GFP_KERNEL, DMA_TO_DEVICE);
1112                 if (!target->tx_ring[i])
1113                         goto err;
1114         }
1115
1116         return 0;
1117
1118 err:
1119         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1120                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1121                 target->rx_ring[i] = NULL;
1122         }
1123
1124         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1125                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1126                 target->tx_ring[i] = NULL;
1127         }
1128
1129         return -ENOMEM;
1130 }
1131
1132 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1133                                struct ib_cm_event *event,
1134                                struct srp_target_port *target)
1135 {
1136         struct Scsi_Host *shost = target->scsi_host;
1137         struct ib_class_port_info *cpi;
1138         int opcode;
1139
1140         switch (event->param.rej_rcvd.reason) {
1141         case IB_CM_REJ_PORT_CM_REDIRECT:
1142                 cpi = event->param.rej_rcvd.ari;
1143                 target->path.dlid = cpi->redirect_lid;
1144                 target->path.pkey = cpi->redirect_pkey;
1145                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1146                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1147
1148                 target->status = target->path.dlid ?
1149                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1150                 break;
1151
1152         case IB_CM_REJ_PORT_REDIRECT:
1153                 if (srp_target_is_topspin(target)) {
1154                         /*
1155                          * Topspin/Cisco SRP gateways incorrectly send
1156                          * reject reason code 25 when they mean 24
1157                          * (port redirect).
1158                          */
1159                         memcpy(target->path.dgid.raw,
1160                                event->param.rej_rcvd.ari, 16);
1161
1162                         shost_printk(KERN_DEBUG, shost,
1163                                      PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1164                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1165                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1166
1167                         target->status = SRP_PORT_REDIRECT;
1168                 } else {
1169                         shost_printk(KERN_WARNING, shost,
1170                                      "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1171                         target->status = -ECONNRESET;
1172                 }
1173                 break;
1174
1175         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1176                 shost_printk(KERN_WARNING, shost,
1177                             "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1178                 target->status = -ECONNRESET;
1179                 break;
1180
1181         case IB_CM_REJ_CONSUMER_DEFINED:
1182                 opcode = *(u8 *) event->private_data;
1183                 if (opcode == SRP_LOGIN_REJ) {
1184                         struct srp_login_rej *rej = event->private_data;
1185                         u32 reason = be32_to_cpu(rej->reason);
1186
1187                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1188                                 shost_printk(KERN_WARNING, shost,
1189                                              PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1190                         else
1191                                 shost_printk(KERN_WARNING, shost,
1192                                             PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1193                 } else
1194                         shost_printk(KERN_WARNING, shost,
1195                                      "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1196                                      " opcode 0x%02x\n", opcode);
1197                 target->status = -ECONNRESET;
1198                 break;
1199
1200         case IB_CM_REJ_STALE_CONN:
1201                 shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
1202                 target->status = SRP_STALE_CONN;
1203                 break;
1204
1205         default:
1206                 shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
1207                              event->param.rej_rcvd.reason);
1208                 target->status = -ECONNRESET;
1209         }
1210 }
1211
1212 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1213 {
1214         struct srp_target_port *target = cm_id->context;
1215         struct ib_qp_attr *qp_attr = NULL;
1216         int attr_mask = 0;
1217         int comp = 0;
1218         int opcode = 0;
1219
1220         switch (event->event) {
1221         case IB_CM_REQ_ERROR:
1222                 shost_printk(KERN_DEBUG, target->scsi_host,
1223                              PFX "Sending CM REQ failed\n");
1224                 comp = 1;
1225                 target->status = -ECONNRESET;
1226                 break;
1227
1228         case IB_CM_REP_RECEIVED:
1229                 comp = 1;
1230                 opcode = *(u8 *) event->private_data;
1231
1232                 if (opcode == SRP_LOGIN_RSP) {
1233                         struct srp_login_rsp *rsp = event->private_data;
1234
1235                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1236                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1237
1238                         target->scsi_host->can_queue = min(target->req_lim,
1239                                                            target->scsi_host->can_queue);
1240                 } else {
1241                         shost_printk(KERN_WARNING, target->scsi_host,
1242                                     PFX "Unhandled RSP opcode %#x\n", opcode);
1243                         target->status = -ECONNRESET;
1244                         break;
1245                 }
1246
1247                 if (!target->rx_ring[0]) {
1248                         target->status = srp_alloc_iu_bufs(target);
1249                         if (target->status)
1250                                 break;
1251                 }
1252
1253                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1254                 if (!qp_attr) {
1255                         target->status = -ENOMEM;
1256                         break;
1257                 }
1258
1259                 qp_attr->qp_state = IB_QPS_RTR;
1260                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1261                 if (target->status)
1262                         break;
1263
1264                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1265                 if (target->status)
1266                         break;
1267
1268                 target->status = srp_post_recv(target);
1269                 if (target->status)
1270                         break;
1271
1272                 qp_attr->qp_state = IB_QPS_RTS;
1273                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1274                 if (target->status)
1275                         break;
1276
1277                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1278                 if (target->status)
1279                         break;
1280
1281                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1282                 if (target->status)
1283                         break;
1284
1285                 break;
1286
1287         case IB_CM_REJ_RECEIVED:
1288                 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1289                 comp = 1;
1290
1291                 srp_cm_rej_handler(cm_id, event, target);
1292                 break;
1293
1294         case IB_CM_DREQ_RECEIVED:
1295                 shost_printk(KERN_WARNING, target->scsi_host,
1296                              PFX "DREQ received - connection closed\n");
1297                 if (ib_send_cm_drep(cm_id, NULL, 0))
1298                         shost_printk(KERN_ERR, target->scsi_host,
1299                                      PFX "Sending CM DREP failed\n");
1300                 break;
1301
1302         case IB_CM_TIMEWAIT_EXIT:
1303                 shost_printk(KERN_ERR, target->scsi_host,
1304                              PFX "connection closed\n");
1305
1306                 comp = 1;
1307                 target->status = 0;
1308                 break;
1309
1310         case IB_CM_MRA_RECEIVED:
1311         case IB_CM_DREQ_ERROR:
1312         case IB_CM_DREP_RECEIVED:
1313                 break;
1314
1315         default:
1316                 shost_printk(KERN_WARNING, target->scsi_host,
1317                              PFX "Unhandled CM event %d\n", event->event);
1318                 break;
1319         }
1320
1321         if (comp)
1322                 complete(&target->done);
1323
1324         kfree(qp_attr);
1325
1326         return 0;
1327 }
1328
1329 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1330                              struct srp_request *req, u8 func)
1331 {
1332         struct srp_iu *iu;
1333         struct srp_tsk_mgmt *tsk_mgmt;
1334
1335         spin_lock_irq(target->scsi_host->host_lock);
1336
1337         if (target->state == SRP_TARGET_DEAD ||
1338             target->state == SRP_TARGET_REMOVED) {
1339                 req->scmnd->result = DID_BAD_TARGET << 16;
1340                 goto out;
1341         }
1342
1343         init_completion(&req->done);
1344
1345         iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1346         if (!iu)
1347                 goto out;
1348
1349         tsk_mgmt = iu->buf;
1350         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1351
1352         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1353         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1354         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1355         tsk_mgmt->tsk_mgmt_func = func;
1356         tsk_mgmt->task_tag      = req->index;
1357
1358         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1359                 goto out;
1360
1361         req->tsk_mgmt = iu;
1362
1363         spin_unlock_irq(target->scsi_host->host_lock);
1364
1365         if (!wait_for_completion_timeout(&req->done,
1366                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1367                 return -1;
1368
1369         return 0;
1370
1371 out:
1372         spin_unlock_irq(target->scsi_host->host_lock);
1373         return -1;
1374 }
1375
1376 static int srp_find_req(struct srp_target_port *target,
1377                         struct scsi_cmnd *scmnd,
1378                         struct srp_request **req)
1379 {
1380         if (scmnd->host_scribble == (void *) -1L)
1381                 return -1;
1382
1383         *req = &target->req_ring[(long) scmnd->host_scribble];
1384
1385         return 0;
1386 }
1387
1388 static int srp_abort(struct scsi_cmnd *scmnd)
1389 {
1390         struct srp_target_port *target = host_to_target(scmnd->device->host);
1391         struct srp_request *req;
1392         int ret = SUCCESS;
1393
1394         shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1395
1396         if (target->qp_in_error)
1397                 return FAILED;
1398         if (srp_find_req(target, scmnd, &req))
1399                 return FAILED;
1400         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1401                 return FAILED;
1402
1403         spin_lock_irq(target->scsi_host->host_lock);
1404
1405         if (req->cmd_done) {
1406                 srp_remove_req(target, req);
1407                 scmnd->scsi_done(scmnd);
1408         } else if (!req->tsk_status) {
1409                 srp_remove_req(target, req);
1410                 scmnd->result = DID_ABORT << 16;
1411         } else
1412                 ret = FAILED;
1413
1414         spin_unlock_irq(target->scsi_host->host_lock);
1415
1416         return ret;
1417 }
1418
1419 static int srp_reset_device(struct scsi_cmnd *scmnd)
1420 {
1421         struct srp_target_port *target = host_to_target(scmnd->device->host);
1422         struct srp_request *req, *tmp;
1423
1424         shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1425
1426         if (target->qp_in_error)
1427                 return FAILED;
1428         if (srp_find_req(target, scmnd, &req))
1429                 return FAILED;
1430         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1431                 return FAILED;
1432         if (req->tsk_status)
1433                 return FAILED;
1434
1435         spin_lock_irq(target->scsi_host->host_lock);
1436
1437         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1438                 if (req->scmnd->device == scmnd->device)
1439                         srp_reset_req(target, req);
1440
1441         spin_unlock_irq(target->scsi_host->host_lock);
1442
1443         return SUCCESS;
1444 }
1445
1446 static int srp_reset_host(struct scsi_cmnd *scmnd)
1447 {
1448         struct srp_target_port *target = host_to_target(scmnd->device->host);
1449         int ret = FAILED;
1450
1451         shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1452
1453         if (!srp_reconnect_target(target))
1454                 ret = SUCCESS;
1455
1456         return ret;
1457 }
1458
1459 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1460                            char *buf)
1461 {
1462         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1463
1464         if (target->state == SRP_TARGET_DEAD ||
1465             target->state == SRP_TARGET_REMOVED)
1466                 return -ENODEV;
1467
1468         return sprintf(buf, "0x%016llx\n",
1469                        (unsigned long long) be64_to_cpu(target->id_ext));
1470 }
1471
1472 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1473                              char *buf)
1474 {
1475         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1476
1477         if (target->state == SRP_TARGET_DEAD ||
1478             target->state == SRP_TARGET_REMOVED)
1479                 return -ENODEV;
1480
1481         return sprintf(buf, "0x%016llx\n",
1482                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1483 }
1484
1485 static ssize_t show_service_id(struct device *dev,
1486                                struct device_attribute *attr, char *buf)
1487 {
1488         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1489
1490         if (target->state == SRP_TARGET_DEAD ||
1491             target->state == SRP_TARGET_REMOVED)
1492                 return -ENODEV;
1493
1494         return sprintf(buf, "0x%016llx\n",
1495                        (unsigned long long) be64_to_cpu(target->service_id));
1496 }
1497
1498 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1499                          char *buf)
1500 {
1501         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1502
1503         if (target->state == SRP_TARGET_DEAD ||
1504             target->state == SRP_TARGET_REMOVED)
1505                 return -ENODEV;
1506
1507         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1508 }
1509
1510 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1511                          char *buf)
1512 {
1513         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1514
1515         if (target->state == SRP_TARGET_DEAD ||
1516             target->state == SRP_TARGET_REMOVED)
1517                 return -ENODEV;
1518
1519         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1520                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1521                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1522                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1523                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1524                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1525                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1526                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1527                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1528 }
1529
1530 static ssize_t show_orig_dgid(struct device *dev,
1531                               struct device_attribute *attr, char *buf)
1532 {
1533         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1534
1535         if (target->state == SRP_TARGET_DEAD ||
1536             target->state == SRP_TARGET_REMOVED)
1537                 return -ENODEV;
1538
1539         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1540                        be16_to_cpu(target->orig_dgid[0]),
1541                        be16_to_cpu(target->orig_dgid[1]),
1542                        be16_to_cpu(target->orig_dgid[2]),
1543                        be16_to_cpu(target->orig_dgid[3]),
1544                        be16_to_cpu(target->orig_dgid[4]),
1545                        be16_to_cpu(target->orig_dgid[5]),
1546                        be16_to_cpu(target->orig_dgid[6]),
1547                        be16_to_cpu(target->orig_dgid[7]));
1548 }
1549
1550 static ssize_t show_zero_req_lim(struct device *dev,
1551                                  struct device_attribute *attr, char *buf)
1552 {
1553         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1554
1555         if (target->state == SRP_TARGET_DEAD ||
1556             target->state == SRP_TARGET_REMOVED)
1557                 return -ENODEV;
1558
1559         return sprintf(buf, "%d\n", target->zero_req_lim);
1560 }
1561
1562 static ssize_t show_local_ib_port(struct device *dev,
1563                                   struct device_attribute *attr, char *buf)
1564 {
1565         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1566
1567         return sprintf(buf, "%d\n", target->srp_host->port);
1568 }
1569
1570 static ssize_t show_local_ib_device(struct device *dev,
1571                                     struct device_attribute *attr, char *buf)
1572 {
1573         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1574
1575         return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1576 }
1577
1578 static DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1579 static DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1580 static DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1581 static DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1582 static DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1583 static DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
1584 static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1585 static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1586 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1587
1588 static struct device_attribute *srp_host_attrs[] = {
1589         &dev_attr_id_ext,
1590         &dev_attr_ioc_guid,
1591         &dev_attr_service_id,
1592         &dev_attr_pkey,
1593         &dev_attr_dgid,
1594         &dev_attr_orig_dgid,
1595         &dev_attr_zero_req_lim,
1596         &dev_attr_local_ib_port,
1597         &dev_attr_local_ib_device,
1598         NULL
1599 };
1600
1601 static struct scsi_host_template srp_template = {
1602         .module                         = THIS_MODULE,
1603         .name                           = "InfiniBand SRP initiator",
1604         .proc_name                      = DRV_NAME,
1605         .info                           = srp_target_info,
1606         .queuecommand                   = srp_queuecommand,
1607         .eh_abort_handler               = srp_abort,
1608         .eh_device_reset_handler        = srp_reset_device,
1609         .eh_host_reset_handler          = srp_reset_host,
1610         .can_queue                      = SRP_SQ_SIZE,
1611         .this_id                        = -1,
1612         .cmd_per_lun                    = SRP_SQ_SIZE,
1613         .use_clustering                 = ENABLE_CLUSTERING,
1614         .shost_attrs                    = srp_host_attrs
1615 };
1616
1617 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1618 {
1619         struct srp_rport_identifiers ids;
1620         struct srp_rport *rport;
1621
1622         sprintf(target->target_name, "SRP.T10:%016llX",
1623                  (unsigned long long) be64_to_cpu(target->id_ext));
1624
1625         if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1626                 return -ENODEV;
1627
1628         memcpy(ids.port_id, &target->id_ext, 8);
1629         memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1630         ids.roles = SRP_RPORT_ROLE_TARGET;
1631         rport = srp_rport_add(target->scsi_host, &ids);
1632         if (IS_ERR(rport)) {
1633                 scsi_remove_host(target->scsi_host);
1634                 return PTR_ERR(rport);
1635         }
1636
1637         spin_lock(&host->target_lock);
1638         list_add_tail(&target->list, &host->target_list);
1639         spin_unlock(&host->target_lock);
1640
1641         target->state = SRP_TARGET_LIVE;
1642
1643         scsi_scan_target(&target->scsi_host->shost_gendev,
1644                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1645
1646         return 0;
1647 }
1648
1649 static void srp_release_dev(struct device *dev)
1650 {
1651         struct srp_host *host =
1652                 container_of(dev, struct srp_host, dev);
1653
1654         complete(&host->released);
1655 }
1656
1657 static struct class srp_class = {
1658         .name    = "infiniband_srp",
1659         .dev_release = srp_release_dev
1660 };
1661
1662 /*
1663  * Target ports are added by writing
1664  *
1665  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1666  *     pkey=<P_Key>,service_id=<service ID>
1667  *
1668  * to the add_target sysfs attribute.
1669  */
1670 enum {
1671         SRP_OPT_ERR             = 0,
1672         SRP_OPT_ID_EXT          = 1 << 0,
1673         SRP_OPT_IOC_GUID        = 1 << 1,
1674         SRP_OPT_DGID            = 1 << 2,
1675         SRP_OPT_PKEY            = 1 << 3,
1676         SRP_OPT_SERVICE_ID      = 1 << 4,
1677         SRP_OPT_MAX_SECT        = 1 << 5,
1678         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1679         SRP_OPT_IO_CLASS        = 1 << 7,
1680         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1681         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1682                                    SRP_OPT_IOC_GUID     |
1683                                    SRP_OPT_DGID         |
1684                                    SRP_OPT_PKEY         |
1685                                    SRP_OPT_SERVICE_ID),
1686 };
1687
1688 static match_table_t srp_opt_tokens = {
1689         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1690         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1691         { SRP_OPT_DGID,                 "dgid=%s"               },
1692         { SRP_OPT_PKEY,                 "pkey=%x"               },
1693         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1694         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1695         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1696         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1697         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1698         { SRP_OPT_ERR,                  NULL                    }
1699 };
1700
1701 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1702 {
1703         char *options, *sep_opt;
1704         char *p;
1705         char dgid[3];
1706         substring_t args[MAX_OPT_ARGS];
1707         int opt_mask = 0;
1708         int token;
1709         int ret = -EINVAL;
1710         int i;
1711
1712         options = kstrdup(buf, GFP_KERNEL);
1713         if (!options)
1714                 return -ENOMEM;
1715
1716         sep_opt = options;
1717         while ((p = strsep(&sep_opt, ",")) != NULL) {
1718                 if (!*p)
1719                         continue;
1720
1721                 token = match_token(p, srp_opt_tokens, args);
1722                 opt_mask |= token;
1723
1724                 switch (token) {
1725                 case SRP_OPT_ID_EXT:
1726                         p = match_strdup(args);
1727                         if (!p) {
1728                                 ret = -ENOMEM;
1729                                 goto out;
1730                         }
1731                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1732                         kfree(p);
1733                         break;
1734
1735                 case SRP_OPT_IOC_GUID:
1736                         p = match_strdup(args);
1737                         if (!p) {
1738                                 ret = -ENOMEM;
1739                                 goto out;
1740                         }
1741                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1742                         kfree(p);
1743                         break;
1744
1745                 case SRP_OPT_DGID:
1746                         p = match_strdup(args);
1747                         if (!p) {
1748                                 ret = -ENOMEM;
1749                                 goto out;
1750                         }
1751                         if (strlen(p) != 32) {
1752                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1753                                 kfree(p);
1754                                 goto out;
1755                         }
1756
1757                         for (i = 0; i < 16; ++i) {
1758                                 strlcpy(dgid, p + i * 2, 3);
1759                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1760                         }
1761                         kfree(p);
1762                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1763                         break;
1764
1765                 case SRP_OPT_PKEY:
1766                         if (match_hex(args, &token)) {
1767                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1768                                 goto out;
1769                         }
1770                         target->path.pkey = cpu_to_be16(token);
1771                         break;
1772
1773                 case SRP_OPT_SERVICE_ID:
1774                         p = match_strdup(args);
1775                         if (!p) {
1776                                 ret = -ENOMEM;
1777                                 goto out;
1778                         }
1779                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1780                         target->path.service_id = target->service_id;
1781                         kfree(p);
1782                         break;
1783
1784                 case SRP_OPT_MAX_SECT:
1785                         if (match_int(args, &token)) {
1786                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1787                                 goto out;
1788                         }
1789                         target->scsi_host->max_sectors = token;
1790                         break;
1791
1792                 case SRP_OPT_MAX_CMD_PER_LUN:
1793                         if (match_int(args, &token)) {
1794                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1795                                 goto out;
1796                         }
1797                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1798                         break;
1799
1800                 case SRP_OPT_IO_CLASS:
1801                         if (match_hex(args, &token)) {
1802                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1803                                 goto out;
1804                         }
1805                         if (token != SRP_REV10_IB_IO_CLASS &&
1806                             token != SRP_REV16A_IB_IO_CLASS) {
1807                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1808                                        " %x specified (use %x or %x).\n",
1809                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1810                                 goto out;
1811                         }
1812                         target->io_class = token;
1813                         break;
1814
1815                 case SRP_OPT_INITIATOR_EXT:
1816                         p = match_strdup(args);
1817                         if (!p) {
1818                                 ret = -ENOMEM;
1819                                 goto out;
1820                         }
1821                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1822                         kfree(p);
1823                         break;
1824
1825                 default:
1826                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1827                                "'%s' in target creation request\n", p);
1828                         goto out;
1829                 }
1830         }
1831
1832         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1833                 ret = 0;
1834         else
1835                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1836                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1837                             !(srp_opt_tokens[i].token & opt_mask))
1838                                 printk(KERN_WARNING PFX "target creation request is "
1839                                        "missing parameter '%s'\n",
1840                                        srp_opt_tokens[i].pattern);
1841
1842 out:
1843         kfree(options);
1844         return ret;
1845 }
1846
1847 static ssize_t srp_create_target(struct device *dev,
1848                                  struct device_attribute *attr,
1849                                  const char *buf, size_t count)
1850 {
1851         struct srp_host *host =
1852                 container_of(dev, struct srp_host, dev);
1853         struct Scsi_Host *target_host;
1854         struct srp_target_port *target;
1855         int ret;
1856         int i;
1857
1858         target_host = scsi_host_alloc(&srp_template,
1859                                       sizeof (struct srp_target_port));
1860         if (!target_host)
1861                 return -ENOMEM;
1862
1863         target_host->transportt = ib_srp_transport_template;
1864         target_host->max_lun     = SRP_MAX_LUN;
1865         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1866
1867         target = host_to_target(target_host);
1868
1869         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1870         target->scsi_host  = target_host;
1871         target->srp_host   = host;
1872
1873         INIT_LIST_HEAD(&target->free_reqs);
1874         INIT_LIST_HEAD(&target->req_queue);
1875         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1876                 target->req_ring[i].index = i;
1877                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1878         }
1879
1880         ret = srp_parse_options(buf, target);
1881         if (ret)
1882                 goto err;
1883
1884         ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1885
1886         shost_printk(KERN_DEBUG, target->scsi_host, PFX
1887                      "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1888                      "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1889                (unsigned long long) be64_to_cpu(target->id_ext),
1890                (unsigned long long) be64_to_cpu(target->ioc_guid),
1891                be16_to_cpu(target->path.pkey),
1892                (unsigned long long) be64_to_cpu(target->service_id),
1893                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1894                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1895                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1896                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1897                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1898                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1899                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1900                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1901
1902         ret = srp_create_target_ib(target);
1903         if (ret)
1904                 goto err;
1905
1906         ret = srp_new_cm_id(target);
1907         if (ret)
1908                 goto err_free;
1909
1910         target->qp_in_error = 0;
1911         ret = srp_connect_target(target);
1912         if (ret) {
1913                 shost_printk(KERN_ERR, target->scsi_host,
1914                              PFX "Connection failed\n");
1915                 goto err_cm_id;
1916         }
1917
1918         ret = srp_add_target(host, target);
1919         if (ret)
1920                 goto err_disconnect;
1921
1922         return count;
1923
1924 err_disconnect:
1925         srp_disconnect_target(target);
1926
1927 err_cm_id:
1928         ib_destroy_cm_id(target->cm_id);
1929
1930 err_free:
1931         srp_free_target_ib(target);
1932
1933 err:
1934         scsi_host_put(target_host);
1935
1936         return ret;
1937 }
1938
1939 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1940
1941 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1942                           char *buf)
1943 {
1944         struct srp_host *host = container_of(dev, struct srp_host, dev);
1945
1946         return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1947 }
1948
1949 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1950
1951 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1952                          char *buf)
1953 {
1954         struct srp_host *host = container_of(dev, struct srp_host, dev);
1955
1956         return sprintf(buf, "%d\n", host->port);
1957 }
1958
1959 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1960
1961 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1962 {
1963         struct srp_host *host;
1964
1965         host = kzalloc(sizeof *host, GFP_KERNEL);
1966         if (!host)
1967                 return NULL;
1968
1969         INIT_LIST_HEAD(&host->target_list);
1970         spin_lock_init(&host->target_lock);
1971         init_completion(&host->released);
1972         host->srp_dev = device;
1973         host->port = port;
1974
1975         host->dev.class = &srp_class;
1976         host->dev.parent = device->dev->dma_device;
1977         snprintf(host->dev.bus_id, BUS_ID_SIZE, "srp-%s-%d",
1978                  device->dev->name, port);
1979
1980         if (device_register(&host->dev))
1981                 goto free_host;
1982         if (device_create_file(&host->dev, &dev_attr_add_target))
1983                 goto err_class;
1984         if (device_create_file(&host->dev, &dev_attr_ibdev))
1985                 goto err_class;
1986         if (device_create_file(&host->dev, &dev_attr_port))
1987                 goto err_class;
1988
1989         return host;
1990
1991 err_class:
1992         device_unregister(&host->dev);
1993
1994 free_host:
1995         kfree(host);
1996
1997         return NULL;
1998 }
1999
2000 static void srp_add_one(struct ib_device *device)
2001 {
2002         struct srp_device *srp_dev;
2003         struct ib_device_attr *dev_attr;
2004         struct ib_fmr_pool_param fmr_param;
2005         struct srp_host *host;
2006         int s, e, p;
2007
2008         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2009         if (!dev_attr)
2010                 return;
2011
2012         if (ib_query_device(device, dev_attr)) {
2013                 printk(KERN_WARNING PFX "Query device failed for %s\n",
2014                        device->name);
2015                 goto free_attr;
2016         }
2017
2018         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2019         if (!srp_dev)
2020                 goto free_attr;
2021
2022         /*
2023          * Use the smallest page size supported by the HCA, down to a
2024          * minimum of 512 bytes (which is the smallest sector that a
2025          * SCSI command will ever carry).
2026          */
2027         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2028         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
2029         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2030
2031         INIT_LIST_HEAD(&srp_dev->dev_list);
2032
2033         srp_dev->dev = device;
2034         srp_dev->pd  = ib_alloc_pd(device);
2035         if (IS_ERR(srp_dev->pd))
2036                 goto free_dev;
2037
2038         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2039                                     IB_ACCESS_LOCAL_WRITE |
2040                                     IB_ACCESS_REMOTE_READ |
2041                                     IB_ACCESS_REMOTE_WRITE);
2042         if (IS_ERR(srp_dev->mr))
2043                 goto err_pd;
2044
2045         memset(&fmr_param, 0, sizeof fmr_param);
2046         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
2047         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
2048         fmr_param.cache             = 1;
2049         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2050         fmr_param.page_shift        = srp_dev->fmr_page_shift;
2051         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
2052                                        IB_ACCESS_REMOTE_WRITE |
2053                                        IB_ACCESS_REMOTE_READ);
2054
2055         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2056         if (IS_ERR(srp_dev->fmr_pool))
2057                 srp_dev->fmr_pool = NULL;
2058
2059         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2060                 s = 0;
2061                 e = 0;
2062         } else {
2063                 s = 1;
2064                 e = device->phys_port_cnt;
2065         }
2066
2067         for (p = s; p <= e; ++p) {
2068                 host = srp_add_port(srp_dev, p);
2069                 if (host)
2070                         list_add_tail(&host->list, &srp_dev->dev_list);
2071         }
2072
2073         ib_set_client_data(device, &srp_client, srp_dev);
2074
2075         goto free_attr;
2076
2077 err_pd:
2078         ib_dealloc_pd(srp_dev->pd);
2079
2080 free_dev:
2081         kfree(srp_dev);
2082
2083 free_attr:
2084         kfree(dev_attr);
2085 }
2086
2087 static void srp_remove_one(struct ib_device *device)
2088 {
2089         struct srp_device *srp_dev;
2090         struct srp_host *host, *tmp_host;
2091         LIST_HEAD(target_list);
2092         struct srp_target_port *target, *tmp_target;
2093
2094         srp_dev = ib_get_client_data(device, &srp_client);
2095
2096         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2097                 device_unregister(&host->dev);
2098                 /*
2099                  * Wait for the sysfs entry to go away, so that no new
2100                  * target ports can be created.
2101                  */
2102                 wait_for_completion(&host->released);
2103
2104                 /*
2105                  * Mark all target ports as removed, so we stop queueing
2106                  * commands and don't try to reconnect.
2107                  */
2108                 spin_lock(&host->target_lock);
2109                 list_for_each_entry(target, &host->target_list, list) {
2110                         spin_lock_irq(target->scsi_host->host_lock);
2111                         target->state = SRP_TARGET_REMOVED;
2112                         spin_unlock_irq(target->scsi_host->host_lock);
2113                 }
2114                 spin_unlock(&host->target_lock);
2115
2116                 /*
2117                  * Wait for any reconnection tasks that may have
2118                  * started before we marked our target ports as
2119                  * removed, and any target port removal tasks.
2120                  */
2121                 flush_scheduled_work();
2122
2123                 list_for_each_entry_safe(target, tmp_target,
2124                                          &host->target_list, list) {
2125                         srp_remove_host(target->scsi_host);
2126                         scsi_remove_host(target->scsi_host);
2127                         srp_disconnect_target(target);
2128                         ib_destroy_cm_id(target->cm_id);
2129                         srp_free_target_ib(target);
2130                         scsi_host_put(target->scsi_host);
2131                 }
2132
2133                 kfree(host);
2134         }
2135
2136         if (srp_dev->fmr_pool)
2137                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2138         ib_dereg_mr(srp_dev->mr);
2139         ib_dealloc_pd(srp_dev->pd);
2140
2141         kfree(srp_dev);
2142 }
2143
2144 static struct srp_function_template ib_srp_transport_functions = {
2145 };
2146
2147 static int __init srp_init_module(void)
2148 {
2149         int ret;
2150
2151         if (srp_sg_tablesize > 255) {
2152                 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2153                 srp_sg_tablesize = 255;
2154         }
2155
2156         ib_srp_transport_template =
2157                 srp_attach_transport(&ib_srp_transport_functions);
2158         if (!ib_srp_transport_template)
2159                 return -ENOMEM;
2160
2161         srp_template.sg_tablesize = srp_sg_tablesize;
2162         srp_max_iu_len = (sizeof (struct srp_cmd) +
2163                           sizeof (struct srp_indirect_buf) +
2164                           srp_sg_tablesize * 16);
2165
2166         ret = class_register(&srp_class);
2167         if (ret) {
2168                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2169                 srp_release_transport(ib_srp_transport_template);
2170                 return ret;
2171         }
2172
2173         ib_sa_register_client(&srp_sa_client);
2174
2175         ret = ib_register_client(&srp_client);
2176         if (ret) {
2177                 printk(KERN_ERR PFX "couldn't register IB client\n");
2178                 srp_release_transport(ib_srp_transport_template);
2179                 ib_sa_unregister_client(&srp_sa_client);
2180                 class_unregister(&srp_class);
2181                 return ret;
2182         }
2183
2184         return 0;
2185 }
2186
2187 static void __exit srp_cleanup_module(void)
2188 {
2189         ib_unregister_client(&srp_client);
2190         ib_sa_unregister_client(&srp_sa_client);
2191         class_unregister(&srp_class);
2192         srp_release_transport(ib_srp_transport_template);
2193 }
2194
2195 module_init(srp_init_module);
2196 module_exit(srp_cleanup_module);