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