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