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