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         /*
 325          * In the published SRP specification (draft rev. 16a), the
 326          * port identifier format is 8 bytes of ID extension followed
 327          * by 8 bytes of GUID.  Older drafts put the two halves in the
 328          * opposite order, so that the GUID comes first.
 329          *
 330          * Targets conforming to these obsolete drafts can be
 331          * recognized by the I/O Class they report.
 332          */
 333         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 334                 memcpy(req->priv.initiator_port_id,
 335                        target->srp_host->initiator_port_id + 8, 8);
 336                 memcpy(req->priv.initiator_port_id + 8,
 337                        target->srp_host->initiator_port_id, 8);
 338                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 339                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 340         } else {
 341                 memcpy(req->priv.initiator_port_id,
 342                        target->srp_host->initiator_port_id, 16);
 343                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 344                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 345         }
 346
 347         /*
 348          * Topspin/Cisco SRP targets will reject our login unless we
 349          * zero out the first 8 bytes of our initiator port ID.  The
 350          * second 8 bytes must be our local node GUID, but we always
 351          * use that anyway.
 352          */
 353         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 354                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 355                        "activated for target GUID %016llx\n",
 356                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 357                 memset(req->priv.initiator_port_id, 0, 8);
 358         }
 359
 360         status = ib_send_cm_req(target->cm_id, &req->param);
 361
 362         kfree(req);
 363
 364         return status;
 365 }
 366
 367 static void srp_disconnect_target(struct srp_target_port *target)
 368 {
 369         /* XXX should send SRP_I_LOGOUT request */
 370
 371         init_completion(&target->done);
 372         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 373                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 374                 return;
 375         }
 376         wait_for_completion(&target->done);
 377 }
 378
 379 static void srp_remove_work(void *target_ptr)
 380 {
 381         struct srp_target_port *target = target_ptr;
 382
 383         spin_lock_irq(target->scsi_host->host_lock);
 384         if (target->state != SRP_TARGET_DEAD) {
 385                 spin_unlock_irq(target->scsi_host->host_lock);
 386                 return;
 387         }
 388         target->state = SRP_TARGET_REMOVED;
 389         spin_unlock_irq(target->scsi_host->host_lock);
 390
 391         spin_lock(&target->srp_host->target_lock);
 392         list_del(&target->list);
 393         spin_unlock(&target->srp_host->target_lock);
 394
 395         scsi_remove_host(target->scsi_host);
 396         ib_destroy_cm_id(target->cm_id);
 397         srp_free_target_ib(target);
 398         scsi_host_put(target->scsi_host);
 399 }
 400
 401 static int srp_connect_target(struct srp_target_port *target)
 402 {
 403         int ret;
 404
 405         ret = srp_lookup_path(target);
 406         if (ret)
 407                 return ret;
 408
 409         while (1) {
 410                 init_completion(&target->done);
 411                 ret = srp_send_req(target);
 412                 if (ret)
 413                         return ret;
 414                 wait_for_completion(&target->done);
 415
 416                 /*
 417                  * The CM event handling code will set status to
 418                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 419                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 420                  * redirect REJ back.
 421                  */
 422                 switch (target->status) {
 423                 case 0:
 424                         return 0;
 425
 426                 case SRP_PORT_REDIRECT:
 427                         ret = srp_lookup_path(target);
 428                         if (ret)
 429                                 return ret;
 430                         break;
 431
 432                 case SRP_DLID_REDIRECT:
 433                         break;
 434
 435                 default:
 436                         return target->status;
 437                 }
 438         }
 439 }
 440
 441 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 442                            struct srp_target_port *target,
 443                            struct srp_request *req)
 444 {
 445         struct scatterlist *scat;
 446         int nents;
 447
 448         if (!scmnd->request_buffer ||
 449             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 450              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 451                 return;
 452
 453         if (req->fmr) {
 454                 ib_fmr_pool_unmap(req->fmr);
 455                 req->fmr = NULL;
 456         }
 457
 458         /*
 459          * This handling of non-SG commands can be killed when the
 460          * SCSI midlayer no longer generates non-SG commands.
 461          */
 462         if (likely(scmnd->use_sg)) {
 463                 nents = scmnd->use_sg;
 464                 scat  = scmnd->request_buffer;
 465         } else {
 466                 nents = 1;
 467                 scat  = &req->fake_sg;
 468         }
 469
 470         dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
 471                      scmnd->sc_data_direction);
 472 }
 473
 474 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 475 {
 476         srp_unmap_data(req->scmnd, target, req);
 477         list_move_tail(&req->list, &target->free_reqs);
 478 }
 479
 480 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 481 {
 482         req->scmnd->result = DID_RESET << 16;
 483         req->scmnd->scsi_done(req->scmnd);
 484         srp_remove_req(target, req);
 485 }
 486
 487 static int srp_reconnect_target(struct srp_target_port *target)
 488 {
 489         struct ib_cm_id *new_cm_id;
 490         struct ib_qp_attr qp_attr;
 491         struct srp_request *req, *tmp;
 492         struct ib_wc wc;
 493         int ret;
 494
 495         spin_lock_irq(target->scsi_host->host_lock);
 496         if (target->state != SRP_TARGET_LIVE) {
 497                 spin_unlock_irq(target->scsi_host->host_lock);
 498                 return -EAGAIN;
 499         }
 500         target->state = SRP_TARGET_CONNECTING;
 501         spin_unlock_irq(target->scsi_host->host_lock);
 502
 503         srp_disconnect_target(target);
 504         /*
 505          * Now get a new local CM ID so that we avoid confusing the
 506          * target in case things are really fouled up.
 507          */
 508         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 509                                     srp_cm_handler, target);
 510         if (IS_ERR(new_cm_id)) {
 511                 ret = PTR_ERR(new_cm_id);
 512                 goto err;
 513         }
 514         ib_destroy_cm_id(target->cm_id);
 515         target->cm_id = new_cm_id;
 516
 517         qp_attr.qp_state = IB_QPS_RESET;
 518         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 519         if (ret)
 520                 goto err;
 521
 522         ret = srp_init_qp(target, target->qp);
 523         if (ret)
 524                 goto err;
 525
 526         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 527                 ; /* nothing */
 528
 529         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 530                 srp_reset_req(target, req);
 531
 532         target->rx_head  = 0;
 533         target->tx_head  = 0;
 534         target->tx_tail  = 0;
 535
 536         ret = srp_connect_target(target);
 537         if (ret)
 538                 goto err;
 539
 540         spin_lock_irq(target->scsi_host->host_lock);
 541         if (target->state == SRP_TARGET_CONNECTING) {
 542                 ret = 0;
 543                 target->state = SRP_TARGET_LIVE;
 544         } else
 545                 ret = -EAGAIN;
 546         spin_unlock_irq(target->scsi_host->host_lock);
 547
 548         return ret;
 549
 550 err:
 551         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 552
 553         /*
 554          * We couldn't reconnect, so kill our target port off.
 555          * However, we have to defer the real removal because we might
 556          * be in the context of the SCSI error handler now, which
 557          * would deadlock if we call scsi_remove_host().
 558          */
 559         spin_lock_irq(target->scsi_host->host_lock);
 560         if (target->state == SRP_TARGET_CONNECTING) {
 561                 target->state = SRP_TARGET_DEAD;
 562                 INIT_WORK(&target->work, srp_remove_work, target);
 563                 schedule_work(&target->work);
 564         }
 565         spin_unlock_irq(target->scsi_host->host_lock);
 566
 567         return ret;
 568 }
 569
 570 static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
 571                        int sg_cnt, struct srp_request *req,
 572                        struct srp_direct_buf *buf)
 573 {
 574         u64 io_addr = 0;
 575         u64 *dma_pages;
 576         u32 len;
 577         int page_cnt;
 578         int i, j;
 579         int ret;
 580
 581         if (!dev->fmr_pool)
 582                 return -ENODEV;
 583
 584         len = page_cnt = 0;
 585         for (i = 0; i < sg_cnt; ++i) {
 586                 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
 587                         if (i > 0)
 588                                 return -EINVAL;
 589                         else
 590                                 ++page_cnt;
 591                 }
 592                 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
 593                     ~dev->fmr_page_mask) {
 594                         if (i < sg_cnt - 1)
 595                                 return -EINVAL;
 596                         else
 597                                 ++page_cnt;
 598                 }
 599
 600                 len += sg_dma_len(&scat[i]);
 601         }
 602
 603         page_cnt += len >> dev->fmr_page_shift;
 604         if (page_cnt > SRP_FMR_SIZE)
 605                 return -ENOMEM;
 606
 607         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 608         if (!dma_pages)
 609                 return -ENOMEM;
 610
 611         page_cnt = 0;
 612         for (i = 0; i < sg_cnt; ++i)
 613                 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
 614                         dma_pages[page_cnt++] =
 615                                 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
 616
 617         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 618                                         dma_pages, page_cnt, io_addr);
 619         if (IS_ERR(req->fmr)) {
 620                 ret = PTR_ERR(req->fmr);
 621                 req->fmr = NULL;
 622                 goto out;
 623         }
 624
 625         buf->va  = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
 626         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 627         buf->len = cpu_to_be32(len);
 628
 629         ret = 0;
 630
 631 out:
 632         kfree(dma_pages);
 633
 634         return ret;
 635 }
 636
 637 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 638                         struct srp_request *req)
 639 {
 640         struct scatterlist *scat;
 641         struct srp_cmd *cmd = req->cmd->buf;
 642         int len, nents, count;
 643         u8 fmt = SRP_DATA_DESC_DIRECT;
 644
 645         if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
 646                 return sizeof (struct srp_cmd);
 647
 648         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 649             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 650                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 651                        scmnd->sc_data_direction);
 652                 return -EINVAL;
 653         }
 654
 655         /*
 656          * This handling of non-SG commands can be killed when the
 657          * SCSI midlayer no longer generates non-SG commands.
 658          */
 659         if (likely(scmnd->use_sg)) {
 660                 nents = scmnd->use_sg;
 661                 scat  = scmnd->request_buffer;
 662         } else {
 663                 nents = 1;
 664                 scat  = &req->fake_sg;
 665                 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
 666         }
 667
 668         count = dma_map_sg(target->srp_host->dev->dev->dma_device,
 669                            scat, nents, scmnd->sc_data_direction);
 670
 671         fmt = SRP_DATA_DESC_DIRECT;
 672         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 673
 674         if (count == 1) {
 675                 /*
 676                  * The midlayer only generated a single gather/scatter
 677                  * entry, or DMA mapping coalesced everything to a
 678                  * single entry.  So a direct descriptor along with
 679                  * the DMA MR suffices.
 680                  */
 681                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 682
 683                 buf->va  = cpu_to_be64(sg_dma_address(scat));
 684                 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
 685                 buf->len = cpu_to_be32(sg_dma_len(scat));
 686         } else if (srp_map_fmr(target->srp_host->dev, scat, count, req,
 687                                (void *) cmd->add_data)) {
 688                 /*
 689                  * FMR mapping failed, and the scatterlist has more
 690                  * than one entry.  Generate an indirect memory
 691                  * descriptor.
 692                  */
 693                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 694                 u32 datalen = 0;
 695                 int i;
 696
 697                 fmt = SRP_DATA_DESC_INDIRECT;
 698                 len = sizeof (struct srp_cmd) +
 699                         sizeof (struct srp_indirect_buf) +
 700                         count * sizeof (struct srp_direct_buf);
 701
 702                 for (i = 0; i < count; ++i) {
 703                         buf->desc_list[i].va  =
 704                                 cpu_to_be64(sg_dma_address(&scat[i]));
 705                         buf->desc_list[i].key =
 706                                 cpu_to_be32(target->srp_host->dev->mr->rkey);
 707                         buf->desc_list[i].len =
 708                                 cpu_to_be32(sg_dma_len(&scat[i]));
 709                         datalen += sg_dma_len(&scat[i]);
 710                 }
 711
 712                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 713                         cmd->data_out_desc_cnt = count;
 714                 else
 715                         cmd->data_in_desc_cnt = count;
 716
 717                 buf->table_desc.va  =
 718                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 719                 buf->table_desc.key =
 720                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 721                 buf->table_desc.len =
 722                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 723
 724                 buf->len = cpu_to_be32(datalen);
 725         }
 726
 727         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 728                 cmd->buf_fmt = fmt << 4;
 729         else
 730                 cmd->buf_fmt = fmt;
 731
 732         return len;
 733 }
 734
 735 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 736 {
 737         struct srp_request *req;
 738         struct scsi_cmnd *scmnd;
 739         unsigned long flags;
 740         s32 delta;
 741
 742         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 743
 744         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 745
 746         target->req_lim += delta;
 747
 748         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 749
 750         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 751                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 752                         req->tsk_status = -1;
 753                 else
 754                         req->tsk_status = rsp->data[3];
 755                 complete(&req->done);
 756         } else {
 757                 scmnd = req->scmnd;
 758                 if (!scmnd)
 759                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 760                                (unsigned long long) rsp->tag);
 761                 scmnd->result = rsp->status;
 762
 763                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 764                         memcpy(scmnd->sense_buffer, rsp->data +
 765                                be32_to_cpu(rsp->resp_data_len),
 766                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 767                                      SCSI_SENSE_BUFFERSIZE));
 768                 }
 769
 770                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 771                         scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
 772                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 773                         scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
 774
 775                 if (!req->tsk_mgmt) {
 776                         scmnd->host_scribble = (void *) -1L;
 777                         scmnd->scsi_done(scmnd);
 778
 779                         srp_remove_req(target, req);
 780                 } else
 781                         req->cmd_done = 1;
 782         }
 783
 784         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 785 }
 786
 787 static void srp_reconnect_work(void *target_ptr)
 788 {
 789         struct srp_target_port *target = target_ptr;
 790
 791         srp_reconnect_target(target);
 792 }
 793
 794 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 795 {
 796         struct srp_iu *iu;
 797         u8 opcode;
 798
 799         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 800
 801         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
 802                                 target->max_ti_iu_len, DMA_FROM_DEVICE);
 803
 804         opcode = *(u8 *) iu->buf;
 805
 806         if (0) {
 807                 int i;
 808
 809                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 810
 811                 for (i = 0; i < wc->byte_len; ++i) {
 812                         if (i % 8 == 0)
 813                                 printk(KERN_ERR "  [%02x] ", i);
 814                         printk(" %02x", ((u8 *) iu->buf)[i]);
 815                         if ((i + 1) % 8 == 0)
 816                                 printk("\n");
 817                 }
 818
 819                 if (wc->byte_len % 8)
 820                         printk("\n");
 821         }
 822
 823         switch (opcode) {
 824         case SRP_RSP:
 825                 srp_process_rsp(target, iu->buf);
 826                 break;
 827
 828         case SRP_T_LOGOUT:
 829                 /* XXX Handle target logout */
 830                 printk(KERN_WARNING PFX "Got target logout request\n");
 831                 break;
 832
 833         default:
 834                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 835                 break;
 836         }
 837
 838         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
 839                                    target->max_ti_iu_len, DMA_FROM_DEVICE);
 840 }
 841
 842 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 843 {
 844         struct srp_target_port *target = target_ptr;
 845         struct ib_wc wc;
 846         unsigned long flags;
 847
 848         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 849         while (ib_poll_cq(cq, 1, &wc) > 0) {
 850                 if (wc.status) {
 851                         printk(KERN_ERR PFX "failed %s status %d\n",
 852                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 853                                wc.status);
 854                         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 855                         if (target->state == SRP_TARGET_LIVE)
 856                                 schedule_work(&target->work);
 857                         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 858                         break;
 859                 }
 860
 861                 if (wc.wr_id & SRP_OP_RECV)
 862                         srp_handle_recv(target, &wc);
 863                 else
 864                         ++target->tx_tail;
 865         }
 866 }
 867
 868 static int __srp_post_recv(struct srp_target_port *target)
 869 {
 870         struct srp_iu *iu;
 871         struct ib_sge list;
 872         struct ib_recv_wr wr, *bad_wr;
 873         unsigned int next;
 874         int ret;
 875
 876         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 877         wr.wr_id = next | SRP_OP_RECV;
 878         iu       = target->rx_ring[next];
 879
 880         list.addr   = iu->dma;
 881         list.length = iu->size;
 882         list.lkey   = target->srp_host->dev->mr->lkey;
 883
 884         wr.next     = NULL;
 885         wr.sg_list  = &list;
 886         wr.num_sge  = 1;
 887
 888         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 889         if (!ret)
 890                 ++target->rx_head;
 891
 892         return ret;
 893 }
 894
 895 static int srp_post_recv(struct srp_target_port *target)
 896 {
 897         unsigned long flags;
 898         int ret;
 899
 900         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 901         ret = __srp_post_recv(target);
 902         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 903
 904         return ret;
 905 }
 906
 907 /*
 908  * Must be called with target->scsi_host->host_lock held to protect
 909  * req_lim and tx_head.  Lock cannot be dropped between call here and
 910  * call to __srp_post_send().
 911  */
 912 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 913 {
 914         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 915                 return NULL;
 916
 917         if (unlikely(target->req_lim < 1))
 918                 ++target->zero_req_lim;
 919
 920         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 921 }
 922
 923 /*
 924  * Must be called with target->scsi_host->host_lock held to protect
 925  * req_lim and tx_head.
 926  */
 927 static int __srp_post_send(struct srp_target_port *target,
 928                            struct srp_iu *iu, int len)
 929 {
 930         struct ib_sge list;
 931         struct ib_send_wr wr, *bad_wr;
 932         int ret = 0;
 933
 934         list.addr   = iu->dma;
 935         list.length = len;
 936         list.lkey   = target->srp_host->dev->mr->lkey;
 937
 938         wr.next       = NULL;
 939         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 940         wr.sg_list    = &list;
 941         wr.num_sge    = 1;
 942         wr.opcode     = IB_WR_SEND;
 943         wr.send_flags = IB_SEND_SIGNALED;
 944
 945         ret = ib_post_send(target->qp, &wr, &bad_wr);
 946
 947         if (!ret) {
 948                 ++target->tx_head;
 949                 --target->req_lim;
 950         }
 951
 952         return ret;
 953 }
 954
 955 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 956                             void (*done)(struct scsi_cmnd *))
 957 {
 958         struct srp_target_port *target = host_to_target(scmnd->device->host);
 959         struct srp_request *req;
 960         struct srp_iu *iu;
 961         struct srp_cmd *cmd;
 962         int len;
 963
 964         if (target->state == SRP_TARGET_CONNECTING)
 965                 goto err;
 966
 967         if (target->state == SRP_TARGET_DEAD ||
 968             target->state == SRP_TARGET_REMOVED) {
 969                 scmnd->result = DID_BAD_TARGET << 16;
 970                 done(scmnd);
 971                 return 0;
 972         }
 973
 974         iu = __srp_get_tx_iu(target);
 975         if (!iu)
 976                 goto err;
 977
 978         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
 979                                 srp_max_iu_len, DMA_TO_DEVICE);
 980
 981         req = list_entry(target->free_reqs.next, struct srp_request, list);
 982
 983         scmnd->scsi_done     = done;
 984         scmnd->result        = 0;
 985         scmnd->host_scribble = (void *) (long) req->index;
 986
 987         cmd = iu->buf;
 988         memset(cmd, 0, sizeof *cmd);
 989
 990         cmd->opcode = SRP_CMD;
 991         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
 992         cmd->tag    = req->index;
 993         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
 994
 995         req->scmnd    = scmnd;
 996         req->cmd      = iu;
 997         req->cmd_done = 0;
 998         req->tsk_mgmt = NULL;
 999
1000         len = srp_map_data(scmnd, target, req);
1001         if (len < 0) {
1002                 printk(KERN_ERR PFX "Failed to map data\n");
1003                 goto err;
1004         }
1005
1006         if (__srp_post_recv(target)) {
1007                 printk(KERN_ERR PFX "Recv failed\n");
1008                 goto err_unmap;
1009         }
1010
1011         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
1012                                    srp_max_iu_len, DMA_TO_DEVICE);
1013
1014         if (__srp_post_send(target, iu, len)) {
1015                 printk(KERN_ERR PFX "Send failed\n");
1016                 goto err_unmap;
1017         }
1018
1019         list_move_tail(&req->list, &target->req_queue);
1020
1021         return 0;
1022
1023 err_unmap:
1024         srp_unmap_data(scmnd, target, req);
1025
1026 err:
1027         return SCSI_MLQUEUE_HOST_BUSY;
1028 }
1029
1030 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1031 {
1032         int i;
1033
1034         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1035                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1036                                                   target->max_ti_iu_len,
1037                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1038                 if (!target->rx_ring[i])
1039                         goto err;
1040         }
1041
1042         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1043                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1044                                                   srp_max_iu_len,
1045                                                   GFP_KERNEL, DMA_TO_DEVICE);
1046                 if (!target->tx_ring[i])
1047                         goto err;
1048         }
1049
1050         return 0;
1051
1052 err:
1053         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1054                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1055                 target->rx_ring[i] = NULL;
1056         }
1057
1058         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1059                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1060                 target->tx_ring[i] = NULL;
1061         }
1062
1063         return -ENOMEM;
1064 }
1065
1066 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1067                                struct ib_cm_event *event,
1068                                struct srp_target_port *target)
1069 {
1070         struct ib_class_port_info *cpi;
1071         int opcode;
1072
1073         switch (event->param.rej_rcvd.reason) {
1074         case IB_CM_REJ_PORT_CM_REDIRECT:
1075                 cpi = event->param.rej_rcvd.ari;
1076                 target->path.dlid = cpi->redirect_lid;
1077                 target->path.pkey = cpi->redirect_pkey;
1078                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1079                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1080
1081                 target->status = target->path.dlid ?
1082                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1083                 break;
1084
1085         case IB_CM_REJ_PORT_REDIRECT:
1086                 if (topspin_workarounds &&
1087                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1088                         /*
1089                          * Topspin/Cisco SRP gateways incorrectly send
1090                          * reject reason code 25 when they mean 24
1091                          * (port redirect).
1092                          */
1093                         memcpy(target->path.dgid.raw,
1094                                event->param.rej_rcvd.ari, 16);
1095
1096                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1097                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1098                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1099
1100                         target->status = SRP_PORT_REDIRECT;
1101                 } else {
1102                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1103                         target->status = -ECONNRESET;
1104                 }
1105                 break;
1106
1107         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1108                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1109                 target->status = -ECONNRESET;
1110                 break;
1111
1112         case IB_CM_REJ_CONSUMER_DEFINED:
1113                 opcode = *(u8 *) event->private_data;
1114                 if (opcode == SRP_LOGIN_REJ) {
1115                         struct srp_login_rej *rej = event->private_data;
1116                         u32 reason = be32_to_cpu(rej->reason);
1117
1118                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1119                                 printk(KERN_WARNING PFX
1120                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1121                         else
1122                                 printk(KERN_WARNING PFX
1123                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1124                 } else
1125                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1126                                " opcode 0x%02x\n", opcode);
1127                 target->status = -ECONNRESET;
1128                 break;
1129
1130         default:
1131                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1132                        event->param.rej_rcvd.reason);
1133                 target->status = -ECONNRESET;
1134         }
1135 }
1136
1137 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1138 {
1139         struct srp_target_port *target = cm_id->context;
1140         struct ib_qp_attr *qp_attr = NULL;
1141         int attr_mask = 0;
1142         int comp = 0;
1143         int opcode = 0;
1144
1145         switch (event->event) {
1146         case IB_CM_REQ_ERROR:
1147                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1148                 comp = 1;
1149                 target->status = -ECONNRESET;
1150                 break;
1151
1152         case IB_CM_REP_RECEIVED:
1153                 comp = 1;
1154                 opcode = *(u8 *) event->private_data;
1155
1156                 if (opcode == SRP_LOGIN_RSP) {
1157                         struct srp_login_rsp *rsp = event->private_data;
1158
1159                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1160                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1161
1162                         target->scsi_host->can_queue = min(target->req_lim,
1163                                                            target->scsi_host->can_queue);
1164                 } else {
1165                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1166                         target->status = -ECONNRESET;
1167                         break;
1168                 }
1169
1170                 target->status = srp_alloc_iu_bufs(target);
1171                 if (target->status)
1172                         break;
1173
1174                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1175                 if (!qp_attr) {
1176                         target->status = -ENOMEM;
1177                         break;
1178                 }
1179
1180                 qp_attr->qp_state = IB_QPS_RTR;
1181                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1182                 if (target->status)
1183                         break;
1184
1185                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1186                 if (target->status)
1187                         break;
1188
1189                 target->status = srp_post_recv(target);
1190                 if (target->status)
1191                         break;
1192
1193                 qp_attr->qp_state = IB_QPS_RTS;
1194                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1195                 if (target->status)
1196                         break;
1197
1198                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1199                 if (target->status)
1200                         break;
1201
1202                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1203                 if (target->status)
1204                         break;
1205
1206                 break;
1207
1208         case IB_CM_REJ_RECEIVED:
1209                 printk(KERN_DEBUG PFX "REJ received\n");
1210                 comp = 1;
1211
1212                 srp_cm_rej_handler(cm_id, event, target);
1213                 break;
1214
1215         case IB_CM_DREQ_RECEIVED:
1216                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1217                 if (ib_send_cm_drep(cm_id, NULL, 0))
1218                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1219                 break;
1220
1221         case IB_CM_TIMEWAIT_EXIT:
1222                 printk(KERN_ERR PFX "connection closed\n");
1223
1224                 comp = 1;
1225                 target->status = 0;
1226                 break;
1227
1228         case IB_CM_MRA_RECEIVED:
1229         case IB_CM_DREQ_ERROR:
1230         case IB_CM_DREP_RECEIVED:
1231                 break;
1232
1233         default:
1234                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1235                 break;
1236         }
1237
1238         if (comp)
1239                 complete(&target->done);
1240
1241         kfree(qp_attr);
1242
1243         return 0;
1244 }
1245
1246 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1247                              struct srp_request *req, u8 func)
1248 {
1249         struct srp_iu *iu;
1250         struct srp_tsk_mgmt *tsk_mgmt;
1251
1252         spin_lock_irq(target->scsi_host->host_lock);
1253
1254         if (target->state == SRP_TARGET_DEAD ||
1255             target->state == SRP_TARGET_REMOVED) {
1256                 req->scmnd->result = DID_BAD_TARGET << 16;
1257                 goto out;
1258         }
1259
1260         init_completion(&req->done);
1261
1262         iu = __srp_get_tx_iu(target);
1263         if (!iu)
1264                 goto out;
1265
1266         tsk_mgmt = iu->buf;
1267         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1268
1269         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1270         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1271         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1272         tsk_mgmt->tsk_mgmt_func = func;
1273         tsk_mgmt->task_tag      = req->index;
1274
1275         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1276                 goto out;
1277
1278         req->tsk_mgmt = iu;
1279
1280         spin_unlock_irq(target->scsi_host->host_lock);
1281
1282         if (!wait_for_completion_timeout(&req->done,
1283                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1284                 return -1;
1285
1286         return 0;
1287
1288 out:
1289         spin_unlock_irq(target->scsi_host->host_lock);
1290         return -1;
1291 }
1292
1293 static int srp_find_req(struct srp_target_port *target,
1294                         struct scsi_cmnd *scmnd,
1295                         struct srp_request **req)
1296 {
1297         if (scmnd->host_scribble == (void *) -1L)
1298                 return -1;
1299
1300         *req = &target->req_ring[(long) scmnd->host_scribble];
1301
1302         return 0;
1303 }
1304
1305 static int srp_abort(struct scsi_cmnd *scmnd)
1306 {
1307         struct srp_target_port *target = host_to_target(scmnd->device->host);
1308         struct srp_request *req;
1309         int ret = SUCCESS;
1310
1311         printk(KERN_ERR "SRP abort called\n");
1312
1313         if (srp_find_req(target, scmnd, &req))
1314                 return FAILED;
1315         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1316                 return FAILED;
1317
1318         spin_lock_irq(target->scsi_host->host_lock);
1319
1320         if (req->cmd_done) {
1321                 srp_remove_req(target, req);
1322                 scmnd->scsi_done(scmnd);
1323         } else if (!req->tsk_status) {
1324                 srp_remove_req(target, req);
1325                 scmnd->result = DID_ABORT << 16;
1326         } else
1327                 ret = FAILED;
1328
1329         spin_unlock_irq(target->scsi_host->host_lock);
1330
1331         return ret;
1332 }
1333
1334 static int srp_reset_device(struct scsi_cmnd *scmnd)
1335 {
1336         struct srp_target_port *target = host_to_target(scmnd->device->host);
1337         struct srp_request *req, *tmp;
1338
1339         printk(KERN_ERR "SRP reset_device called\n");
1340
1341         if (srp_find_req(target, scmnd, &req))
1342                 return FAILED;
1343         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1344                 return FAILED;
1345         if (req->tsk_status)
1346                 return FAILED;
1347
1348         spin_lock_irq(target->scsi_host->host_lock);
1349
1350         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1351                 if (req->scmnd->device == scmnd->device)
1352                         srp_reset_req(target, req);
1353
1354         spin_unlock_irq(target->scsi_host->host_lock);
1355
1356         return SUCCESS;
1357 }
1358
1359 static int srp_reset_host(struct scsi_cmnd *scmnd)
1360 {
1361         struct srp_target_port *target = host_to_target(scmnd->device->host);
1362         int ret = FAILED;
1363
1364         printk(KERN_ERR PFX "SRP reset_host called\n");
1365
1366         if (!srp_reconnect_target(target))
1367                 ret = SUCCESS;
1368
1369         return ret;
1370 }
1371
1372 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1373 {
1374         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1375
1376         if (target->state == SRP_TARGET_DEAD ||
1377             target->state == SRP_TARGET_REMOVED)
1378                 return -ENODEV;
1379
1380         return sprintf(buf, "0x%016llx\n",
1381                        (unsigned long long) be64_to_cpu(target->id_ext));
1382 }
1383
1384 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1385 {
1386         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1387
1388         if (target->state == SRP_TARGET_DEAD ||
1389             target->state == SRP_TARGET_REMOVED)
1390                 return -ENODEV;
1391
1392         return sprintf(buf, "0x%016llx\n",
1393                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1394 }
1395
1396 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1397 {
1398         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1399
1400         if (target->state == SRP_TARGET_DEAD ||
1401             target->state == SRP_TARGET_REMOVED)
1402                 return -ENODEV;
1403
1404         return sprintf(buf, "0x%016llx\n",
1405                        (unsigned long long) be64_to_cpu(target->service_id));
1406 }
1407
1408 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1409 {
1410         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1411
1412         if (target->state == SRP_TARGET_DEAD ||
1413             target->state == SRP_TARGET_REMOVED)
1414                 return -ENODEV;
1415
1416         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1417 }
1418
1419 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1420 {
1421         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1422
1423         if (target->state == SRP_TARGET_DEAD ||
1424             target->state == SRP_TARGET_REMOVED)
1425                 return -ENODEV;
1426
1427         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1428                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1429                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1430                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1431                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1432                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1433                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1434                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1435                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1436 }
1437
1438 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1439 {
1440         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1441
1442         if (target->state == SRP_TARGET_DEAD ||
1443             target->state == SRP_TARGET_REMOVED)
1444                 return -ENODEV;
1445
1446         return sprintf(buf, "%d\n", target->zero_req_lim);
1447 }
1448
1449 static CLASS_DEVICE_ATTR(id_ext,        S_IRUGO, show_id_ext,           NULL);
1450 static CLASS_DEVICE_ATTR(ioc_guid,      S_IRUGO, show_ioc_guid,         NULL);
1451 static CLASS_DEVICE_ATTR(service_id,    S_IRUGO, show_service_id,       NULL);
1452 static CLASS_DEVICE_ATTR(pkey,          S_IRUGO, show_pkey,             NULL);
1453 static CLASS_DEVICE_ATTR(dgid,          S_IRUGO, show_dgid,             NULL);
1454 static CLASS_DEVICE_ATTR(zero_req_lim,  S_IRUGO, show_zero_req_lim,     NULL);
1455
1456 static struct class_device_attribute *srp_host_attrs[] = {
1457         &class_device_attr_id_ext,
1458         &class_device_attr_ioc_guid,
1459         &class_device_attr_service_id,
1460         &class_device_attr_pkey,
1461         &class_device_attr_dgid,
1462         &class_device_attr_zero_req_lim,
1463         NULL
1464 };
1465
1466 static struct scsi_host_template srp_template = {
1467         .module                         = THIS_MODULE,
1468         .name                           = DRV_NAME,
1469         .info                           = srp_target_info,
1470         .queuecommand                   = srp_queuecommand,
1471         .eh_abort_handler               = srp_abort,
1472         .eh_device_reset_handler        = srp_reset_device,
1473         .eh_host_reset_handler          = srp_reset_host,
1474         .can_queue                      = SRP_SQ_SIZE,
1475         .this_id                        = -1,
1476         .cmd_per_lun                    = SRP_SQ_SIZE,
1477         .use_clustering                 = ENABLE_CLUSTERING,
1478         .shost_attrs                    = srp_host_attrs
1479 };
1480
1481 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1482 {
1483         sprintf(target->target_name, "SRP.T10:%016llX",
1484                  (unsigned long long) be64_to_cpu(target->id_ext));
1485
1486         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1487                 return -ENODEV;
1488
1489         spin_lock(&host->target_lock);
1490         list_add_tail(&target->list, &host->target_list);
1491         spin_unlock(&host->target_lock);
1492
1493         target->state = SRP_TARGET_LIVE;
1494
1495         scsi_scan_target(&target->scsi_host->shost_gendev,
1496                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1497
1498         return 0;
1499 }
1500
1501 static void srp_release_class_dev(struct class_device *class_dev)
1502 {
1503         struct srp_host *host =
1504                 container_of(class_dev, struct srp_host, class_dev);
1505
1506         complete(&host->released);
1507 }
1508
1509 static struct class srp_class = {
1510         .name    = "infiniband_srp",
1511         .release = srp_release_class_dev
1512 };
1513
1514 /*
1515  * Target ports are added by writing
1516  *
1517  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1518  *     pkey=<P_Key>,service_id=<service ID>
1519  *
1520  * to the add_target sysfs attribute.
1521  */
1522 enum {
1523         SRP_OPT_ERR             = 0,
1524         SRP_OPT_ID_EXT          = 1 << 0,
1525         SRP_OPT_IOC_GUID        = 1 << 1,
1526         SRP_OPT_DGID            = 1 << 2,
1527         SRP_OPT_PKEY            = 1 << 3,
1528         SRP_OPT_SERVICE_ID      = 1 << 4,
1529         SRP_OPT_MAX_SECT        = 1 << 5,
1530         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1531         SRP_OPT_IO_CLASS        = 1 << 7,
1532         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1533                                    SRP_OPT_IOC_GUID     |
1534                                    SRP_OPT_DGID         |
1535                                    SRP_OPT_PKEY         |
1536                                    SRP_OPT_SERVICE_ID),
1537 };
1538
1539 static match_table_t srp_opt_tokens = {
1540         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1541         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1542         { SRP_OPT_DGID,                 "dgid=%s"               },
1543         { SRP_OPT_PKEY,                 "pkey=%x"               },
1544         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1545         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1546         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1547         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1548         { SRP_OPT_ERR,                  NULL                    }
1549 };
1550
1551 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1552 {
1553         char *options, *sep_opt;
1554         char *p;
1555         char dgid[3];
1556         substring_t args[MAX_OPT_ARGS];
1557         int opt_mask = 0;
1558         int token;
1559         int ret = -EINVAL;
1560         int i;
1561
1562         options = kstrdup(buf, GFP_KERNEL);
1563         if (!options)
1564                 return -ENOMEM;
1565
1566         sep_opt = options;
1567         while ((p = strsep(&sep_opt, ",")) != NULL) {
1568                 if (!*p)
1569                         continue;
1570
1571                 token = match_token(p, srp_opt_tokens, args);
1572                 opt_mask |= token;
1573
1574                 switch (token) {
1575                 case SRP_OPT_ID_EXT:
1576                         p = match_strdup(args);
1577                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1578                         kfree(p);
1579                         break;
1580
1581                 case SRP_OPT_IOC_GUID:
1582                         p = match_strdup(args);
1583                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1584                         kfree(p);
1585                         break;
1586
1587                 case SRP_OPT_DGID:
1588                         p = match_strdup(args);
1589                         if (strlen(p) != 32) {
1590                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1591                                 kfree(p);
1592                                 goto out;
1593                         }
1594
1595                         for (i = 0; i < 16; ++i) {
1596                                 strlcpy(dgid, p + i * 2, 3);
1597                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1598                         }
1599                         kfree(p);
1600                         break;
1601
1602                 case SRP_OPT_PKEY:
1603                         if (match_hex(args, &token)) {
1604                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1605                                 goto out;
1606                         }
1607                         target->path.pkey = cpu_to_be16(token);
1608                         break;
1609
1610                 case SRP_OPT_SERVICE_ID:
1611                         p = match_strdup(args);
1612                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1613                         kfree(p);
1614                         break;
1615
1616                 case SRP_OPT_MAX_SECT:
1617                         if (match_int(args, &token)) {
1618                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1619                                 goto out;
1620                         }
1621                         target->scsi_host->max_sectors = token;
1622                         break;
1623
1624                 case SRP_OPT_MAX_CMD_PER_LUN:
1625                         if (match_int(args, &token)) {
1626                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1627                                 goto out;
1628                         }
1629                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1630                         break;
1631
1632                 case SRP_OPT_IO_CLASS:
1633                         if (match_hex(args, &token)) {
1634                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1635                                 goto out;
1636                         }
1637                         if (token != SRP_REV10_IB_IO_CLASS &&
1638                             token != SRP_REV16A_IB_IO_CLASS) {
1639                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1640                                        " %x specified (use %x or %x).\n",
1641                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1642                                 goto out;
1643                         }
1644                         target->io_class = token;
1645                         break;
1646
1647                 default:
1648                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1649                                "'%s' in target creation request\n", p);
1650                         goto out;
1651                 }
1652         }
1653
1654         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1655                 ret = 0;
1656         else
1657                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1658                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1659                             !(srp_opt_tokens[i].token & opt_mask))
1660                                 printk(KERN_WARNING PFX "target creation request is "
1661                                        "missing parameter '%s'\n",
1662                                        srp_opt_tokens[i].pattern);
1663
1664 out:
1665         kfree(options);
1666         return ret;
1667 }
1668
1669 static ssize_t srp_create_target(struct class_device *class_dev,
1670                                  const char *buf, size_t count)
1671 {
1672         struct srp_host *host =
1673                 container_of(class_dev, struct srp_host, class_dev);
1674         struct Scsi_Host *target_host;
1675         struct srp_target_port *target;
1676         int ret;
1677         int i;
1678
1679         target_host = scsi_host_alloc(&srp_template,
1680                                       sizeof (struct srp_target_port));
1681         if (!target_host)
1682                 return -ENOMEM;
1683
1684         target_host->max_lun = SRP_MAX_LUN;
1685
1686         target = host_to_target(target_host);
1687         memset(target, 0, sizeof *target);
1688
1689         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1690         target->scsi_host  = target_host;
1691         target->srp_host   = host;
1692
1693         INIT_WORK(&target->work, srp_reconnect_work, target);
1694
1695         INIT_LIST_HEAD(&target->free_reqs);
1696         INIT_LIST_HEAD(&target->req_queue);
1697         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1698                 target->req_ring[i].index = i;
1699                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1700         }
1701
1702         ret = srp_parse_options(buf, target);
1703         if (ret)
1704                 goto err;
1705
1706         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1707
1708         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1709                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1710                (unsigned long long) be64_to_cpu(target->id_ext),
1711                (unsigned long long) be64_to_cpu(target->ioc_guid),
1712                be16_to_cpu(target->path.pkey),
1713                (unsigned long long) be64_to_cpu(target->service_id),
1714                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1715                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1716                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1717                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1718                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1719                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1720                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1721                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1722
1723         ret = srp_create_target_ib(target);
1724         if (ret)
1725                 goto err;
1726
1727         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1728         if (IS_ERR(target->cm_id)) {
1729                 ret = PTR_ERR(target->cm_id);
1730                 goto err_free;
1731         }
1732
1733         ret = srp_connect_target(target);
1734         if (ret) {
1735                 printk(KERN_ERR PFX "Connection failed\n");
1736                 goto err_cm_id;
1737         }
1738
1739         ret = srp_add_target(host, target);
1740         if (ret)
1741                 goto err_disconnect;
1742
1743         return count;
1744
1745 err_disconnect:
1746         srp_disconnect_target(target);
1747
1748 err_cm_id:
1749         ib_destroy_cm_id(target->cm_id);
1750
1751 err_free:
1752         srp_free_target_ib(target);
1753
1754 err:
1755         scsi_host_put(target_host);
1756
1757         return ret;
1758 }
1759
1760 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1761
1762 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1763 {
1764         struct srp_host *host =
1765                 container_of(class_dev, struct srp_host, class_dev);
1766
1767         return sprintf(buf, "%s\n", host->dev->dev->name);
1768 }
1769
1770 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1771
1772 static ssize_t show_port(struct class_device *class_dev, char *buf)
1773 {
1774         struct srp_host *host =
1775                 container_of(class_dev, struct srp_host, class_dev);
1776
1777         return sprintf(buf, "%d\n", host->port);
1778 }
1779
1780 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1781
1782 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1783 {
1784         struct srp_host *host;
1785
1786         host = kzalloc(sizeof *host, GFP_KERNEL);
1787         if (!host)
1788                 return NULL;
1789
1790         INIT_LIST_HEAD(&host->target_list);
1791         spin_lock_init(&host->target_lock);
1792         init_completion(&host->released);
1793         host->dev  = device;
1794         host->port = port;
1795
1796         host->initiator_port_id[7] = port;
1797         memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1798
1799         host->class_dev.class = &srp_class;
1800         host->class_dev.dev   = device->dev->dma_device;
1801         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1802                  device->dev->name, port);
1803
1804         if (class_device_register(&host->class_dev))
1805                 goto free_host;
1806         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1807                 goto err_class;
1808         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1809                 goto err_class;
1810         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1811                 goto err_class;
1812
1813         return host;
1814
1815 err_class:
1816         class_device_unregister(&host->class_dev);
1817
1818 free_host:
1819         kfree(host);
1820
1821         return NULL;
1822 }
1823
1824 static void srp_add_one(struct ib_device *device)
1825 {
1826         struct srp_device *srp_dev;
1827         struct ib_device_attr *dev_attr;
1828         struct ib_fmr_pool_param fmr_param;
1829         struct srp_host *host;
1830         int s, e, p;
1831
1832         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1833         if (!dev_attr)
1834                 return;
1835
1836         if (ib_query_device(device, dev_attr)) {
1837                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1838                        device->name);
1839                 goto free_attr;
1840         }
1841
1842         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1843         if (!srp_dev)
1844                 goto free_attr;
1845
1846         /*
1847          * Use the smallest page size supported by the HCA, down to a
1848          * minimum of 512 bytes (which is the smallest sector that a
1849          * SCSI command will ever carry).
1850          */
1851         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1852         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1853         srp_dev->fmr_page_mask  = ~((unsigned long) srp_dev->fmr_page_size - 1);
1854
1855         INIT_LIST_HEAD(&srp_dev->dev_list);
1856
1857         srp_dev->dev = device;
1858         srp_dev->pd  = ib_alloc_pd(device);
1859         if (IS_ERR(srp_dev->pd))
1860                 goto free_dev;
1861
1862         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1863                                     IB_ACCESS_LOCAL_WRITE |
1864                                     IB_ACCESS_REMOTE_READ |
1865                                     IB_ACCESS_REMOTE_WRITE);
1866         if (IS_ERR(srp_dev->mr))
1867                 goto err_pd;
1868
1869         memset(&fmr_param, 0, sizeof fmr_param);
1870         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1871         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1872         fmr_param.cache             = 1;
1873         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1874         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1875         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1876                                        IB_ACCESS_REMOTE_WRITE |
1877                                        IB_ACCESS_REMOTE_READ);
1878
1879         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1880         if (IS_ERR(srp_dev->fmr_pool))
1881                 srp_dev->fmr_pool = NULL;
1882
1883         if (device->node_type == IB_NODE_SWITCH) {
1884                 s = 0;
1885                 e = 0;
1886         } else {
1887                 s = 1;
1888                 e = device->phys_port_cnt;
1889         }
1890
1891         for (p = s; p <= e; ++p) {
1892                 host = srp_add_port(srp_dev, p);
1893                 if (host)
1894                         list_add_tail(&host->list, &srp_dev->dev_list);
1895         }
1896
1897         ib_set_client_data(device, &srp_client, srp_dev);
1898
1899         goto free_attr;
1900
1901 err_pd:
1902         ib_dealloc_pd(srp_dev->pd);
1903
1904 free_dev:
1905         kfree(srp_dev);
1906
1907 free_attr:
1908         kfree(dev_attr);
1909 }
1910
1911 static void srp_remove_one(struct ib_device *device)
1912 {
1913         struct srp_device *srp_dev;
1914         struct srp_host *host, *tmp_host;
1915         LIST_HEAD(target_list);
1916         struct srp_target_port *target, *tmp_target;
1917
1918         srp_dev = ib_get_client_data(device, &srp_client);
1919
1920         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1921                 class_device_unregister(&host->class_dev);
1922                 /*
1923                  * Wait for the sysfs entry to go away, so that no new
1924                  * target ports can be created.
1925                  */
1926                 wait_for_completion(&host->released);
1927
1928                 /*
1929                  * Mark all target ports as removed, so we stop queueing
1930                  * commands and don't try to reconnect.
1931                  */
1932                 spin_lock(&host->target_lock);
1933                 list_for_each_entry(target, &host->target_list, list) {
1934                         spin_lock_irq(target->scsi_host->host_lock);
1935                         target->state = SRP_TARGET_REMOVED;
1936                         spin_unlock_irq(target->scsi_host->host_lock);
1937                 }
1938                 spin_unlock(&host->target_lock);
1939
1940                 /*
1941                  * Wait for any reconnection tasks that may have
1942                  * started before we marked our target ports as
1943                  * removed, and any target port removal tasks.
1944                  */
1945                 flush_scheduled_work();
1946
1947                 list_for_each_entry_safe(target, tmp_target,
1948                                          &host->target_list, list) {
1949                         scsi_remove_host(target->scsi_host);
1950                         srp_disconnect_target(target);
1951                         ib_destroy_cm_id(target->cm_id);
1952                         srp_free_target_ib(target);
1953                         scsi_host_put(target->scsi_host);
1954                 }
1955
1956                 kfree(host);
1957         }
1958
1959         if (srp_dev->fmr_pool)
1960                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1961         ib_dereg_mr(srp_dev->mr);
1962         ib_dealloc_pd(srp_dev->pd);
1963
1964         kfree(srp_dev);
1965 }
1966
1967 static int __init srp_init_module(void)
1968 {
1969         int ret;
1970
1971         srp_template.sg_tablesize = srp_sg_tablesize;
1972         srp_max_iu_len = (sizeof (struct srp_cmd) +
1973                           sizeof (struct srp_indirect_buf) +
1974                           srp_sg_tablesize * 16);
1975
1976         ret = class_register(&srp_class);
1977         if (ret) {
1978                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1979                 return ret;
1980         }
1981
1982         ret = ib_register_client(&srp_client);
1983         if (ret) {
1984                 printk(KERN_ERR PFX "couldn't register IB client\n");
1985                 class_unregister(&srp_class);
1986                 return ret;
1987         }
1988
1989         return 0;
1990 }
1991
1992 static void __exit srp_cleanup_module(void)
1993 {
1994         ib_unregister_client(&srp_client);
1995         class_unregister(&srp_class);
1996 }
1997
1998 module_init(srp_init_module);
1999 module_exit(srp_cleanup_module);