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