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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 #include <scsi/scsi_transport_srp.h>
  51
  52 #include <rdma/ib_cache.h>
  53
  54 #include "ib_srp.h"
  55
  56 #define DRV_NAME        "ib_srp"
  57 #define PFX             DRV_NAME ": "
  58 #define DRV_VERSION     "0.2"
  59 #define DRV_RELDATE     "November 1, 2005"
  60
  61 MODULE_AUTHOR("Roland Dreier");
  62 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
  63                    "v" DRV_VERSION " (" DRV_RELDATE ")");
  64 MODULE_LICENSE("Dual BSD/GPL");
  65
  66 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
  67 static int srp_max_iu_len;
  68
  69 module_param(srp_sg_tablesize, int, 0444);
  70 MODULE_PARM_DESC(srp_sg_tablesize,
  71                  "Max number of gather/scatter entries per I/O (default is 12)");
  72
  73 static int topspin_workarounds = 1;
  74
  75 module_param(topspin_workarounds, int, 0444);
  76 MODULE_PARM_DESC(topspin_workarounds,
  77                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  78
  79 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
  80
  81 static int mellanox_workarounds = 1;
  82
  83 module_param(mellanox_workarounds, int, 0444);
  84 MODULE_PARM_DESC(mellanox_workarounds,
  85                  "Enable workarounds for Mellanox SRP target bugs if != 0");
  86
  87 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
  88
  89 static void srp_add_one(struct ib_device *device);
  90 static void srp_remove_one(struct ib_device *device);
  91 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  92 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  93
  94 static struct scsi_transport_template *ib_srp_transport_template;
  95
  96 static struct ib_client srp_client = {
  97         .name   = "srp",
  98         .add    = srp_add_one,
  99         .remove = srp_remove_one
 100 };
 101
 102 static struct ib_sa_client srp_sa_client;
 103
 104 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
 105 {
 106         return (struct srp_target_port *) host->hostdata;
 107 }
 108
 109 static const char *srp_target_info(struct Scsi_Host *host)
 110 {
 111         return host_to_target(host)->target_name;
 112 }
 113
 114 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 115                                    gfp_t gfp_mask,
 116                                    enum dma_data_direction direction)
 117 {
 118         struct srp_iu *iu;
 119
 120         iu = kmalloc(sizeof *iu, gfp_mask);
 121         if (!iu)
 122                 goto out;
 123
 124         iu->buf = kzalloc(size, gfp_mask);
 125         if (!iu->buf)
 126                 goto out_free_iu;
 127
 128         iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
 129         if (ib_dma_mapping_error(host->dev->dev, iu->dma))
 130                 goto out_free_buf;
 131
 132         iu->size      = size;
 133         iu->direction = direction;
 134
 135         return iu;
 136
 137 out_free_buf:
 138         kfree(iu->buf);
 139 out_free_iu:
 140         kfree(iu);
 141 out:
 142         return NULL;
 143 }
 144
 145 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 146 {
 147         if (!iu)
 148                 return;
 149
 150         ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
 151         kfree(iu->buf);
 152         kfree(iu);
 153 }
 154
 155 static void srp_qp_event(struct ib_event *event, void *context)
 156 {
 157         printk(KERN_ERR PFX "QP event %d\n", event->event);
 158 }
 159
 160 static int srp_init_qp(struct srp_target_port *target,
 161                        struct ib_qp *qp)
 162 {
 163         struct ib_qp_attr *attr;
 164         int ret;
 165
 166         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 167         if (!attr)
 168                 return -ENOMEM;
 169
 170         ret = ib_find_cached_pkey(target->srp_host->dev->dev,
 171                                   target->srp_host->port,
 172                                   be16_to_cpu(target->path.pkey),
 173                                   &attr->pkey_index);
 174         if (ret)
 175                 goto out;
 176
 177         attr->qp_state        = IB_QPS_INIT;
 178         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 179                                     IB_ACCESS_REMOTE_WRITE);
 180         attr->port_num        = target->srp_host->port;
 181
 182         ret = ib_modify_qp(qp, attr,
 183                            IB_QP_STATE          |
 184                            IB_QP_PKEY_INDEX     |
 185                            IB_QP_ACCESS_FLAGS   |
 186                            IB_QP_PORT);
 187
 188 out:
 189         kfree(attr);
 190         return ret;
 191 }
 192
 193 static int srp_create_target_ib(struct srp_target_port *target)
 194 {
 195         struct ib_qp_init_attr *init_attr;
 196         int ret;
 197
 198         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 199         if (!init_attr)
 200                 return -ENOMEM;
 201
 202         target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
 203                                   NULL, target, SRP_CQ_SIZE, 0);
 204         if (IS_ERR(target->cq)) {
 205                 ret = PTR_ERR(target->cq);
 206                 goto out;
 207         }
 208
 209         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 210
 211         init_attr->event_handler       = srp_qp_event;
 212         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 213         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 214         init_attr->cap.max_recv_sge    = 1;
 215         init_attr->cap.max_send_sge    = 1;
 216         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 217         init_attr->qp_type             = IB_QPT_RC;
 218         init_attr->send_cq             = target->cq;
 219         init_attr->recv_cq             = target->cq;
 220
 221         target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
 222         if (IS_ERR(target->qp)) {
 223                 ret = PTR_ERR(target->qp);
 224                 ib_destroy_cq(target->cq);
 225                 goto out;
 226         }
 227
 228         ret = srp_init_qp(target, target->qp);
 229         if (ret) {
 230                 ib_destroy_qp(target->qp);
 231                 ib_destroy_cq(target->cq);
 232                 goto out;
 233         }
 234
 235 out:
 236         kfree(init_attr);
 237         return ret;
 238 }
 239
 240 static void srp_free_target_ib(struct srp_target_port *target)
 241 {
 242         int i;
 243
 244         ib_destroy_qp(target->qp);
 245         ib_destroy_cq(target->cq);
 246
 247         for (i = 0; i < SRP_RQ_SIZE; ++i)
 248                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 249         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 250                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 251 }
 252
 253 static void srp_path_rec_completion(int status,
 254                                     struct ib_sa_path_rec *pathrec,
 255                                     void *target_ptr)
 256 {
 257         struct srp_target_port *target = target_ptr;
 258
 259         target->status = status;
 260         if (status)
 261                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
 262         else
 263                 target->path = *pathrec;
 264         complete(&target->done);
 265 }
 266
 267 static int srp_lookup_path(struct srp_target_port *target)
 268 {
 269         target->path.numb_path = 1;
 270
 271         init_completion(&target->done);
 272
 273         target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
 274                                                    target->srp_host->dev->dev,
 275                                                    target->srp_host->port,
 276                                                    &target->path,
 277                                                    IB_SA_PATH_REC_DGID          |
 278                                                    IB_SA_PATH_REC_SGID          |
 279                                                    IB_SA_PATH_REC_NUMB_PATH     |
 280                                                    IB_SA_PATH_REC_PKEY,
 281                                                    SRP_PATH_REC_TIMEOUT_MS,
 282                                                    GFP_KERNEL,
 283                                                    srp_path_rec_completion,
 284                                                    target, &target->path_query);
 285         if (target->path_query_id < 0)
 286                 return target->path_query_id;
 287
 288         wait_for_completion(&target->done);
 289
 290         if (target->status < 0)
 291                 printk(KERN_WARNING PFX "Path record query failed\n");
 292
 293         return target->status;
 294 }
 295
 296 static int srp_send_req(struct srp_target_port *target)
 297 {
 298         struct {
 299                 struct ib_cm_req_param param;
 300                 struct srp_login_req   priv;
 301         } *req = NULL;
 302         int status;
 303
 304         req = kzalloc(sizeof *req, GFP_KERNEL);
 305         if (!req)
 306                 return -ENOMEM;
 307
 308         req->param.primary_path               = &target->path;
 309         req->param.alternate_path             = NULL;
 310         req->param.service_id                 = target->service_id;
 311         req->param.qp_num                     = target->qp->qp_num;
 312         req->param.qp_type                    = target->qp->qp_type;
 313         req->param.private_data               = &req->priv;
 314         req->param.private_data_len           = sizeof req->priv;
 315         req->param.flow_control               = 1;
 316
 317         get_random_bytes(&req->param.starting_psn, 4);
 318         req->param.starting_psn              &= 0xffffff;
 319
 320         /*
 321          * Pick some arbitrary defaults here; we could make these
 322          * module parameters if anyone cared about setting them.
 323          */
 324         req->param.responder_resources        = 4;
 325         req->param.remote_cm_response_timeout = 20;
 326         req->param.local_cm_response_timeout  = 20;
 327         req->param.retry_count                = 7;
 328         req->param.rnr_retry_count            = 7;
 329         req->param.max_cm_retries             = 15;
 330
 331         req->priv.opcode        = SRP_LOGIN_REQ;
 332         req->priv.tag           = 0;
 333         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 334         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 335                                               SRP_BUF_FORMAT_INDIRECT);
 336         /*
 337          * In the published SRP specification (draft rev. 16a), the
 338          * port identifier format is 8 bytes of ID extension followed
 339          * by 8 bytes of GUID.  Older drafts put the two halves in the
 340          * opposite order, so that the GUID comes first.
 341          *
 342          * Targets conforming to these obsolete drafts can be
 343          * recognized by the I/O Class they report.
 344          */
 345         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 346                 memcpy(req->priv.initiator_port_id,
 347                        &target->path.sgid.global.interface_id, 8);
 348                 memcpy(req->priv.initiator_port_id + 8,
 349                        &target->initiator_ext, 8);
 350                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 351                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 352         } else {
 353                 memcpy(req->priv.initiator_port_id,
 354                        &target->initiator_ext, 8);
 355                 memcpy(req->priv.initiator_port_id + 8,
 356                        &target->path.sgid.global.interface_id, 8);
 357                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 358                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 359         }
 360
 361         /*
 362          * Topspin/Cisco SRP targets will reject our login unless we
 363          * zero out the first 8 bytes of our initiator port ID and set
 364          * the second 8 bytes to the local node GUID.
 365          */
 366         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 367                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 368                        "activated for target GUID %016llx\n",
 369                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 370                 memset(req->priv.initiator_port_id, 0, 8);
 371                 memcpy(req->priv.initiator_port_id + 8,
 372                        &target->srp_host->dev->dev->node_guid, 8);
 373         }
 374
 375         status = ib_send_cm_req(target->cm_id, &req->param);
 376
 377         kfree(req);
 378
 379         return status;
 380 }
 381
 382 static void srp_disconnect_target(struct srp_target_port *target)
 383 {
 384         /* XXX should send SRP_I_LOGOUT request */
 385
 386         init_completion(&target->done);
 387         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 388                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 389                 return;
 390         }
 391         wait_for_completion(&target->done);
 392 }
 393
 394 static void srp_remove_work(struct work_struct *work)
 395 {
 396         struct srp_target_port *target =
 397                 container_of(work, struct srp_target_port, work);
 398
 399         spin_lock_irq(target->scsi_host->host_lock);
 400         if (target->state != SRP_TARGET_DEAD) {
 401                 spin_unlock_irq(target->scsi_host->host_lock);
 402                 return;
 403         }
 404         target->state = SRP_TARGET_REMOVED;
 405         spin_unlock_irq(target->scsi_host->host_lock);
 406
 407         spin_lock(&target->srp_host->target_lock);
 408         list_del(&target->list);
 409         spin_unlock(&target->srp_host->target_lock);
 410
 411         srp_remove_host(target->scsi_host);
 412         scsi_remove_host(target->scsi_host);
 413         ib_destroy_cm_id(target->cm_id);
 414         srp_free_target_ib(target);
 415         scsi_host_put(target->scsi_host);
 416 }
 417
 418 static int srp_connect_target(struct srp_target_port *target)
 419 {
 420         int ret;
 421
 422         ret = srp_lookup_path(target);
 423         if (ret)
 424                 return ret;
 425
 426         while (1) {
 427                 init_completion(&target->done);
 428                 ret = srp_send_req(target);
 429                 if (ret)
 430                         return ret;
 431                 wait_for_completion(&target->done);
 432
 433                 /*
 434                  * The CM event handling code will set status to
 435                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 436                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 437                  * redirect REJ back.
 438                  */
 439                 switch (target->status) {
 440                 case 0:
 441                         return 0;
 442
 443                 case SRP_PORT_REDIRECT:
 444                         ret = srp_lookup_path(target);
 445                         if (ret)
 446                                 return ret;
 447                         break;
 448
 449                 case SRP_DLID_REDIRECT:
 450                         break;
 451
 452                 default:
 453                         return target->status;
 454                 }
 455         }
 456 }
 457
 458 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 459                            struct srp_target_port *target,
 460                            struct srp_request *req)
 461 {
 462         if (!scsi_sglist(scmnd) ||
 463             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 464              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 465                 return;
 466
 467         if (req->fmr) {
 468                 ib_fmr_pool_unmap(req->fmr);
 469                 req->fmr = NULL;
 470         }
 471
 472         ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
 473                         scsi_sg_count(scmnd), scmnd->sc_data_direction);
 474 }
 475
 476 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 477 {
 478         srp_unmap_data(req->scmnd, target, req);
 479         list_move_tail(&req->list, &target->free_reqs);
 480 }
 481
 482 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 483 {
 484         req->scmnd->result = DID_RESET << 16;
 485         req->scmnd->scsi_done(req->scmnd);
 486         srp_remove_req(target, req);
 487 }
 488
 489 static int srp_reconnect_target(struct srp_target_port *target)
 490 {
 491         struct ib_cm_id *new_cm_id;
 492         struct ib_qp_attr qp_attr;
 493         struct srp_request *req, *tmp;
 494         struct ib_wc wc;
 495         int ret;
 496
 497         spin_lock_irq(target->scsi_host->host_lock);
 498         if (target->state != SRP_TARGET_LIVE) {
 499                 spin_unlock_irq(target->scsi_host->host_lock);
 500                 return -EAGAIN;
 501         }
 502         target->state = SRP_TARGET_CONNECTING;
 503         spin_unlock_irq(target->scsi_host->host_lock);
 504
 505         srp_disconnect_target(target);
 506         /*
 507          * Now get a new local CM ID so that we avoid confusing the
 508          * target in case things are really fouled up.
 509          */
 510         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 511                                     srp_cm_handler, target);
 512         if (IS_ERR(new_cm_id)) {
 513                 ret = PTR_ERR(new_cm_id);
 514                 goto err;
 515         }
 516         ib_destroy_cm_id(target->cm_id);
 517         target->cm_id = new_cm_id;
 518
 519         qp_attr.qp_state = IB_QPS_RESET;
 520         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 521         if (ret)
 522                 goto err;
 523
 524         ret = srp_init_qp(target, target->qp);
 525         if (ret)
 526                 goto err;
 527
 528         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 529                 ; /* nothing */
 530
 531         spin_lock_irq(target->scsi_host->host_lock);
 532         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 533                 srp_reset_req(target, req);
 534         spin_unlock_irq(target->scsi_host->host_lock);
 535
 536         target->rx_head  = 0;
 537         target->tx_head  = 0;
 538         target->tx_tail  = 0;
 539
 540         target->qp_in_error = 0;
 541         ret = srp_connect_target(target);
 542         if (ret)
 543                 goto err;
 544
 545         spin_lock_irq(target->scsi_host->host_lock);
 546         if (target->state == SRP_TARGET_CONNECTING) {
 547                 ret = 0;
 548                 target->state = SRP_TARGET_LIVE;
 549         } else
 550                 ret = -EAGAIN;
 551         spin_unlock_irq(target->scsi_host->host_lock);
 552
 553         return ret;
 554
 555 err:
 556         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 557
 558         /*
 559          * We couldn't reconnect, so kill our target port off.
 560          * However, we have to defer the real removal because we might
 561          * be in the context of the SCSI error handler now, which
 562          * would deadlock if we call scsi_remove_host().
 563          */
 564         spin_lock_irq(target->scsi_host->host_lock);
 565         if (target->state == SRP_TARGET_CONNECTING) {
 566                 target->state = SRP_TARGET_DEAD;
 567                 INIT_WORK(&target->work, srp_remove_work);
 568                 schedule_work(&target->work);
 569         }
 570         spin_unlock_irq(target->scsi_host->host_lock);
 571
 572         return ret;
 573 }
 574
 575 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 576                        int sg_cnt, struct srp_request *req,
 577                        struct srp_direct_buf *buf)
 578 {
 579         u64 io_addr = 0;
 580         u64 *dma_pages;
 581         u32 len;
 582         int page_cnt;
 583         int i, j;
 584         int ret;
 585         struct srp_device *dev = target->srp_host->dev;
 586         struct ib_device *ibdev = dev->dev;
 587         struct scatterlist *sg;
 588
 589         if (!dev->fmr_pool)
 590                 return -ENODEV;
 591
 592         if ((ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask) &&
 593             mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3))
 594                 return -EINVAL;
 595
 596         len = page_cnt = 0;
 597         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 598                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 599
 600                 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
 601                         if (i > 0)
 602                                 return -EINVAL;
 603                         else
 604                                 ++page_cnt;
 605                 }
 606                 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
 607                     ~dev->fmr_page_mask) {
 608                         if (i < sg_cnt - 1)
 609                                 return -EINVAL;
 610                         else
 611                                 ++page_cnt;
 612                 }
 613
 614                 len += dma_len;
 615         }
 616
 617         page_cnt += len >> dev->fmr_page_shift;
 618         if (page_cnt > SRP_FMR_SIZE)
 619                 return -ENOMEM;
 620
 621         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 622         if (!dma_pages)
 623                 return -ENOMEM;
 624
 625         page_cnt = 0;
 626         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 627                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 628
 629                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 630                         dma_pages[page_cnt++] =
 631                                 (ib_sg_dma_address(ibdev, sg) &
 632                                  dev->fmr_page_mask) + j;
 633         }
 634
 635         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 636                                         dma_pages, page_cnt, io_addr);
 637         if (IS_ERR(req->fmr)) {
 638                 ret = PTR_ERR(req->fmr);
 639                 req->fmr = NULL;
 640                 goto out;
 641         }
 642
 643         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 644                                ~dev->fmr_page_mask);
 645         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 646         buf->len = cpu_to_be32(len);
 647
 648         ret = 0;
 649
 650 out:
 651         kfree(dma_pages);
 652
 653         return ret;
 654 }
 655
 656 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 657                         struct srp_request *req)
 658 {
 659         struct scatterlist *scat;
 660         struct srp_cmd *cmd = req->cmd->buf;
 661         int len, nents, count;
 662         u8 fmt = SRP_DATA_DESC_DIRECT;
 663         struct srp_device *dev;
 664         struct ib_device *ibdev;
 665
 666         if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
 667                 return sizeof (struct srp_cmd);
 668
 669         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 670             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 671                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 672                        scmnd->sc_data_direction);
 673                 return -EINVAL;
 674         }
 675
 676         nents = scsi_sg_count(scmnd);
 677         scat  = scsi_sglist(scmnd);
 678
 679         dev = target->srp_host->dev;
 680         ibdev = dev->dev;
 681
 682         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 683
 684         fmt = SRP_DATA_DESC_DIRECT;
 685         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 686
 687         if (count == 1) {
 688                 /*
 689                  * The midlayer only generated a single gather/scatter
 690                  * entry, or DMA mapping coalesced everything to a
 691                  * single entry.  So a direct descriptor along with
 692                  * the DMA MR suffices.
 693                  */
 694                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 695
 696                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 697                 buf->key = cpu_to_be32(dev->mr->rkey);
 698                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 699         } else if (srp_map_fmr(target, scat, count, req,
 700                                (void *) cmd->add_data)) {
 701                 /*
 702                  * FMR mapping failed, and the scatterlist has more
 703                  * than one entry.  Generate an indirect memory
 704                  * descriptor.
 705                  */
 706                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 707                 struct scatterlist *sg;
 708                 u32 datalen = 0;
 709                 int i;
 710
 711                 fmt = SRP_DATA_DESC_INDIRECT;
 712                 len = sizeof (struct srp_cmd) +
 713                         sizeof (struct srp_indirect_buf) +
 714                         count * sizeof (struct srp_direct_buf);
 715
 716                 scsi_for_each_sg(scmnd, sg, count, i) {
 717                         unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 718
 719                         buf->desc_list[i].va  =
 720                                 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
 721                         buf->desc_list[i].key =
 722                                 cpu_to_be32(dev->mr->rkey);
 723                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 724                         datalen += dma_len;
 725                 }
 726
 727                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 728                         cmd->data_out_desc_cnt = count;
 729                 else
 730                         cmd->data_in_desc_cnt = count;
 731
 732                 buf->table_desc.va  =
 733                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 734                 buf->table_desc.key =
 735                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 736                 buf->table_desc.len =
 737                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 738
 739                 buf->len = cpu_to_be32(datalen);
 740         }
 741
 742         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 743                 cmd->buf_fmt = fmt << 4;
 744         else
 745                 cmd->buf_fmt = fmt;
 746
 747         return len;
 748 }
 749
 750 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 751 {
 752         struct srp_request *req;
 753         struct scsi_cmnd *scmnd;
 754         unsigned long flags;
 755         s32 delta;
 756
 757         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 758
 759         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 760
 761         target->req_lim += delta;
 762
 763         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 764
 765         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 766                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 767                         req->tsk_status = -1;
 768                 else
 769                         req->tsk_status = rsp->data[3];
 770                 complete(&req->done);
 771         } else {
 772                 scmnd = req->scmnd;
 773                 if (!scmnd)
 774                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 775                                (unsigned long long) rsp->tag);
 776                 scmnd->result = rsp->status;
 777
 778                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 779                         memcpy(scmnd->sense_buffer, rsp->data +
 780                                be32_to_cpu(rsp->resp_data_len),
 781                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 782                                      SCSI_SENSE_BUFFERSIZE));
 783                 }
 784
 785                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 786                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 787                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 788                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 789
 790                 if (!req->tsk_mgmt) {
 791                         scmnd->host_scribble = (void *) -1L;
 792                         scmnd->scsi_done(scmnd);
 793
 794                         srp_remove_req(target, req);
 795                 } else
 796                         req->cmd_done = 1;
 797         }
 798
 799         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 800 }
 801
 802 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 803 {
 804         struct ib_device *dev;
 805         struct srp_iu *iu;
 806         u8 opcode;
 807
 808         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 809
 810         dev = target->srp_host->dev->dev;
 811         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 812                                    DMA_FROM_DEVICE);
 813
 814         opcode = *(u8 *) iu->buf;
 815
 816         if (0) {
 817                 int i;
 818
 819                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 820
 821                 for (i = 0; i < wc->byte_len; ++i) {
 822                         if (i % 8 == 0)
 823                                 printk(KERN_ERR "  [%02x] ", i);
 824                         printk(" %02x", ((u8 *) iu->buf)[i]);
 825                         if ((i + 1) % 8 == 0)
 826                                 printk("\n");
 827                 }
 828
 829                 if (wc->byte_len % 8)
 830                         printk("\n");
 831         }
 832
 833         switch (opcode) {
 834         case SRP_RSP:
 835                 srp_process_rsp(target, iu->buf);
 836                 break;
 837
 838         case SRP_T_LOGOUT:
 839                 /* XXX Handle target logout */
 840                 printk(KERN_WARNING PFX "Got target logout request\n");
 841                 break;
 842
 843         default:
 844                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 845                 break;
 846         }
 847
 848         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 849                                       DMA_FROM_DEVICE);
 850 }
 851
 852 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 853 {
 854         struct srp_target_port *target = target_ptr;
 855         struct ib_wc wc;
 856
 857         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 858         while (ib_poll_cq(cq, 1, &wc) > 0) {
 859                 if (wc.status) {
 860                         printk(KERN_ERR PFX "failed %s status %d\n",
 861                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 862                                wc.status);
 863                         target->qp_in_error = 1;
 864                         break;
 865                 }
 866
 867                 if (wc.wr_id & SRP_OP_RECV)
 868                         srp_handle_recv(target, &wc);
 869                 else
 870                         ++target->tx_tail;
 871         }
 872 }
 873
 874 static int __srp_post_recv(struct srp_target_port *target)
 875 {
 876         struct srp_iu *iu;
 877         struct ib_sge list;
 878         struct ib_recv_wr wr, *bad_wr;
 879         unsigned int next;
 880         int ret;
 881
 882         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 883         wr.wr_id = next | SRP_OP_RECV;
 884         iu       = target->rx_ring[next];
 885
 886         list.addr   = iu->dma;
 887         list.length = iu->size;
 888         list.lkey   = target->srp_host->dev->mr->lkey;
 889
 890         wr.next     = NULL;
 891         wr.sg_list  = &list;
 892         wr.num_sge  = 1;
 893
 894         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 895         if (!ret)
 896                 ++target->rx_head;
 897
 898         return ret;
 899 }
 900
 901 static int srp_post_recv(struct srp_target_port *target)
 902 {
 903         unsigned long flags;
 904         int ret;
 905
 906         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 907         ret = __srp_post_recv(target);
 908         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 909
 910         return ret;
 911 }
 912
 913 /*
 914  * Must be called with target->scsi_host->host_lock held to protect
 915  * req_lim and tx_head.  Lock cannot be dropped between call here and
 916  * call to __srp_post_send().
 917  */
 918 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 919 {
 920         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 921                 return NULL;
 922
 923         if (unlikely(target->req_lim < 1))
 924                 ++target->zero_req_lim;
 925
 926         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 927 }
 928
 929 /*
 930  * Must be called with target->scsi_host->host_lock held to protect
 931  * req_lim and tx_head.
 932  */
 933 static int __srp_post_send(struct srp_target_port *target,
 934                            struct srp_iu *iu, int len)
 935 {
 936         struct ib_sge list;
 937         struct ib_send_wr wr, *bad_wr;
 938         int ret = 0;
 939
 940         list.addr   = iu->dma;
 941         list.length = len;
 942         list.lkey   = target->srp_host->dev->mr->lkey;
 943
 944         wr.next       = NULL;
 945         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 946         wr.sg_list    = &list;
 947         wr.num_sge    = 1;
 948         wr.opcode     = IB_WR_SEND;
 949         wr.send_flags = IB_SEND_SIGNALED;
 950
 951         ret = ib_post_send(target->qp, &wr, &bad_wr);
 952
 953         if (!ret) {
 954                 ++target->tx_head;
 955                 --target->req_lim;
 956         }
 957
 958         return ret;
 959 }
 960
 961 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 962                             void (*done)(struct scsi_cmnd *))
 963 {
 964         struct srp_target_port *target = host_to_target(scmnd->device->host);
 965         struct srp_request *req;
 966         struct srp_iu *iu;
 967         struct srp_cmd *cmd;
 968         struct ib_device *dev;
 969         int len;
 970
 971         if (target->state == SRP_TARGET_CONNECTING)
 972                 goto err;
 973
 974         if (target->state == SRP_TARGET_DEAD ||
 975             target->state == SRP_TARGET_REMOVED) {
 976                 scmnd->result = DID_BAD_TARGET << 16;
 977                 done(scmnd);
 978                 return 0;
 979         }
 980
 981         iu = __srp_get_tx_iu(target);
 982         if (!iu)
 983                 goto err;
 984
 985         dev = target->srp_host->dev->dev;
 986         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
 987                                    DMA_TO_DEVICE);
 988
 989         req = list_entry(target->free_reqs.next, struct srp_request, list);
 990
 991         scmnd->scsi_done     = done;
 992         scmnd->result        = 0;
 993         scmnd->host_scribble = (void *) (long) req->index;
 994
 995         cmd = iu->buf;
 996         memset(cmd, 0, sizeof *cmd);
 997
 998         cmd->opcode = SRP_CMD;
 999         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1000         cmd->tag    = req->index;
1001         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1002
1003         req->scmnd    = scmnd;
1004         req->cmd      = iu;
1005         req->cmd_done = 0;
1006         req->tsk_mgmt = NULL;
1007
1008         len = srp_map_data(scmnd, target, req);
1009         if (len < 0) {
1010                 printk(KERN_ERR PFX "Failed to map data\n");
1011                 goto err;
1012         }
1013
1014         if (__srp_post_recv(target)) {
1015                 printk(KERN_ERR PFX "Recv failed\n");
1016                 goto err_unmap;
1017         }
1018
1019         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1020                                       DMA_TO_DEVICE);
1021
1022         if (__srp_post_send(target, iu, len)) {
1023                 printk(KERN_ERR PFX "Send failed\n");
1024                 goto err_unmap;
1025         }
1026
1027         list_move_tail(&req->list, &target->req_queue);
1028
1029         return 0;
1030
1031 err_unmap:
1032         srp_unmap_data(scmnd, target, req);
1033
1034 err:
1035         return SCSI_MLQUEUE_HOST_BUSY;
1036 }
1037
1038 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1039 {
1040         int i;
1041
1042         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1043                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1044                                                   target->max_ti_iu_len,
1045                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1046                 if (!target->rx_ring[i])
1047                         goto err;
1048         }
1049
1050         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1051                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1052                                                   srp_max_iu_len,
1053                                                   GFP_KERNEL, DMA_TO_DEVICE);
1054                 if (!target->tx_ring[i])
1055                         goto err;
1056         }
1057
1058         return 0;
1059
1060 err:
1061         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1062                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1063                 target->rx_ring[i] = NULL;
1064         }
1065
1066         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1067                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1068                 target->tx_ring[i] = NULL;
1069         }
1070
1071         return -ENOMEM;
1072 }
1073
1074 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1075                                struct ib_cm_event *event,
1076                                struct srp_target_port *target)
1077 {
1078         struct ib_class_port_info *cpi;
1079         int opcode;
1080
1081         switch (event->param.rej_rcvd.reason) {
1082         case IB_CM_REJ_PORT_CM_REDIRECT:
1083                 cpi = event->param.rej_rcvd.ari;
1084                 target->path.dlid = cpi->redirect_lid;
1085                 target->path.pkey = cpi->redirect_pkey;
1086                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1087                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1088
1089                 target->status = target->path.dlid ?
1090                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1091                 break;
1092
1093         case IB_CM_REJ_PORT_REDIRECT:
1094                 if (topspin_workarounds &&
1095                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1096                         /*
1097                          * Topspin/Cisco SRP gateways incorrectly send
1098                          * reject reason code 25 when they mean 24
1099                          * (port redirect).
1100                          */
1101                         memcpy(target->path.dgid.raw,
1102                                event->param.rej_rcvd.ari, 16);
1103
1104                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1105                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1106                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1107
1108                         target->status = SRP_PORT_REDIRECT;
1109                 } else {
1110                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1111                         target->status = -ECONNRESET;
1112                 }
1113                 break;
1114
1115         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1116                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1117                 target->status = -ECONNRESET;
1118                 break;
1119
1120         case IB_CM_REJ_CONSUMER_DEFINED:
1121                 opcode = *(u8 *) event->private_data;
1122                 if (opcode == SRP_LOGIN_REJ) {
1123                         struct srp_login_rej *rej = event->private_data;
1124                         u32 reason = be32_to_cpu(rej->reason);
1125
1126                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1127                                 printk(KERN_WARNING PFX
1128                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1129                         else
1130                                 printk(KERN_WARNING PFX
1131                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1132                 } else
1133                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1134                                " opcode 0x%02x\n", opcode);
1135                 target->status = -ECONNRESET;
1136                 break;
1137
1138         default:
1139                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1140                        event->param.rej_rcvd.reason);
1141                 target->status = -ECONNRESET;
1142         }
1143 }
1144
1145 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1146 {
1147         struct srp_target_port *target = cm_id->context;
1148         struct ib_qp_attr *qp_attr = NULL;
1149         int attr_mask = 0;
1150         int comp = 0;
1151         int opcode = 0;
1152
1153         switch (event->event) {
1154         case IB_CM_REQ_ERROR:
1155                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1156                 comp = 1;
1157                 target->status = -ECONNRESET;
1158                 break;
1159
1160         case IB_CM_REP_RECEIVED:
1161                 comp = 1;
1162                 opcode = *(u8 *) event->private_data;
1163
1164                 if (opcode == SRP_LOGIN_RSP) {
1165                         struct srp_login_rsp *rsp = event->private_data;
1166
1167                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1168                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1169
1170                         target->scsi_host->can_queue = min(target->req_lim,
1171                                                            target->scsi_host->can_queue);
1172                 } else {
1173                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1174                         target->status = -ECONNRESET;
1175                         break;
1176                 }
1177
1178                 if (!target->rx_ring[0]) {
1179                         target->status = srp_alloc_iu_bufs(target);
1180                         if (target->status)
1181                                 break;
1182                 }
1183
1184                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1185                 if (!qp_attr) {
1186                         target->status = -ENOMEM;
1187                         break;
1188                 }
1189
1190                 qp_attr->qp_state = IB_QPS_RTR;
1191                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1192                 if (target->status)
1193                         break;
1194
1195                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1196                 if (target->status)
1197                         break;
1198
1199                 target->status = srp_post_recv(target);
1200                 if (target->status)
1201                         break;
1202
1203                 qp_attr->qp_state = IB_QPS_RTS;
1204                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1205                 if (target->status)
1206                         break;
1207
1208                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1209                 if (target->status)
1210                         break;
1211
1212                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1213                 if (target->status)
1214                         break;
1215
1216                 break;
1217
1218         case IB_CM_REJ_RECEIVED:
1219                 printk(KERN_DEBUG PFX "REJ received\n");
1220                 comp = 1;
1221
1222                 srp_cm_rej_handler(cm_id, event, target);
1223                 break;
1224
1225         case IB_CM_DREQ_RECEIVED:
1226                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1227                 if (ib_send_cm_drep(cm_id, NULL, 0))
1228                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1229                 break;
1230
1231         case IB_CM_TIMEWAIT_EXIT:
1232                 printk(KERN_ERR PFX "connection closed\n");
1233
1234                 comp = 1;
1235                 target->status = 0;
1236                 break;
1237
1238         case IB_CM_MRA_RECEIVED:
1239         case IB_CM_DREQ_ERROR:
1240         case IB_CM_DREP_RECEIVED:
1241                 break;
1242
1243         default:
1244                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1245                 break;
1246         }
1247
1248         if (comp)
1249                 complete(&target->done);
1250
1251         kfree(qp_attr);
1252
1253         return 0;
1254 }
1255
1256 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1257                              struct srp_request *req, u8 func)
1258 {
1259         struct srp_iu *iu;
1260         struct srp_tsk_mgmt *tsk_mgmt;
1261
1262         spin_lock_irq(target->scsi_host->host_lock);
1263
1264         if (target->state == SRP_TARGET_DEAD ||
1265             target->state == SRP_TARGET_REMOVED) {
1266                 req->scmnd->result = DID_BAD_TARGET << 16;
1267                 goto out;
1268         }
1269
1270         init_completion(&req->done);
1271
1272         iu = __srp_get_tx_iu(target);
1273         if (!iu)
1274                 goto out;
1275
1276         tsk_mgmt = iu->buf;
1277         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1278
1279         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1280         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1281         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1282         tsk_mgmt->tsk_mgmt_func = func;
1283         tsk_mgmt->task_tag      = req->index;
1284
1285         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1286                 goto out;
1287
1288         req->tsk_mgmt = iu;
1289
1290         spin_unlock_irq(target->scsi_host->host_lock);
1291
1292         if (!wait_for_completion_timeout(&req->done,
1293                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1294                 return -1;
1295
1296         return 0;
1297
1298 out:
1299         spin_unlock_irq(target->scsi_host->host_lock);
1300         return -1;
1301 }
1302
1303 static int srp_find_req(struct srp_target_port *target,
1304                         struct scsi_cmnd *scmnd,
1305                         struct srp_request **req)
1306 {
1307         if (scmnd->host_scribble == (void *) -1L)
1308                 return -1;
1309
1310         *req = &target->req_ring[(long) scmnd->host_scribble];
1311
1312         return 0;
1313 }
1314
1315 static int srp_abort(struct scsi_cmnd *scmnd)
1316 {
1317         struct srp_target_port *target = host_to_target(scmnd->device->host);
1318         struct srp_request *req;
1319         int ret = SUCCESS;
1320
1321         printk(KERN_ERR "SRP abort called\n");
1322
1323         if (target->qp_in_error)
1324                 return FAILED;
1325         if (srp_find_req(target, scmnd, &req))
1326                 return FAILED;
1327         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1328                 return FAILED;
1329
1330         spin_lock_irq(target->scsi_host->host_lock);
1331
1332         if (req->cmd_done) {
1333                 srp_remove_req(target, req);
1334                 scmnd->scsi_done(scmnd);
1335         } else if (!req->tsk_status) {
1336                 srp_remove_req(target, req);
1337                 scmnd->result = DID_ABORT << 16;
1338         } else
1339                 ret = FAILED;
1340
1341         spin_unlock_irq(target->scsi_host->host_lock);
1342
1343         return ret;
1344 }
1345
1346 static int srp_reset_device(struct scsi_cmnd *scmnd)
1347 {
1348         struct srp_target_port *target = host_to_target(scmnd->device->host);
1349         struct srp_request *req, *tmp;
1350
1351         printk(KERN_ERR "SRP reset_device called\n");
1352
1353         if (target->qp_in_error)
1354                 return FAILED;
1355         if (srp_find_req(target, scmnd, &req))
1356                 return FAILED;
1357         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1358                 return FAILED;
1359         if (req->tsk_status)
1360                 return FAILED;
1361
1362         spin_lock_irq(target->scsi_host->host_lock);
1363
1364         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1365                 if (req->scmnd->device == scmnd->device)
1366                         srp_reset_req(target, req);
1367
1368         spin_unlock_irq(target->scsi_host->host_lock);
1369
1370         return SUCCESS;
1371 }
1372
1373 static int srp_reset_host(struct scsi_cmnd *scmnd)
1374 {
1375         struct srp_target_port *target = host_to_target(scmnd->device->host);
1376         int ret = FAILED;
1377
1378         printk(KERN_ERR PFX "SRP reset_host called\n");
1379
1380         if (!srp_reconnect_target(target))
1381                 ret = SUCCESS;
1382
1383         return ret;
1384 }
1385
1386 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1387 {
1388         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1389
1390         if (target->state == SRP_TARGET_DEAD ||
1391             target->state == SRP_TARGET_REMOVED)
1392                 return -ENODEV;
1393
1394         return sprintf(buf, "0x%016llx\n",
1395                        (unsigned long long) be64_to_cpu(target->id_ext));
1396 }
1397
1398 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1399 {
1400         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1401
1402         if (target->state == SRP_TARGET_DEAD ||
1403             target->state == SRP_TARGET_REMOVED)
1404                 return -ENODEV;
1405
1406         return sprintf(buf, "0x%016llx\n",
1407                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1408 }
1409
1410 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1411 {
1412         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1413
1414         if (target->state == SRP_TARGET_DEAD ||
1415             target->state == SRP_TARGET_REMOVED)
1416                 return -ENODEV;
1417
1418         return sprintf(buf, "0x%016llx\n",
1419                        (unsigned long long) be64_to_cpu(target->service_id));
1420 }
1421
1422 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1423 {
1424         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1425
1426         if (target->state == SRP_TARGET_DEAD ||
1427             target->state == SRP_TARGET_REMOVED)
1428                 return -ENODEV;
1429
1430         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1431 }
1432
1433 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1434 {
1435         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1436
1437         if (target->state == SRP_TARGET_DEAD ||
1438             target->state == SRP_TARGET_REMOVED)
1439                 return -ENODEV;
1440
1441         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1442                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1443                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1444                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1445                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1446                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1447                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1448                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1449                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1450 }
1451
1452 static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1453 {
1454         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1455
1456         if (target->state == SRP_TARGET_DEAD ||
1457             target->state == SRP_TARGET_REMOVED)
1458                 return -ENODEV;
1459
1460         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1461                        be16_to_cpu(target->orig_dgid[0]),
1462                        be16_to_cpu(target->orig_dgid[1]),
1463                        be16_to_cpu(target->orig_dgid[2]),
1464                        be16_to_cpu(target->orig_dgid[3]),
1465                        be16_to_cpu(target->orig_dgid[4]),
1466                        be16_to_cpu(target->orig_dgid[5]),
1467                        be16_to_cpu(target->orig_dgid[6]),
1468                        be16_to_cpu(target->orig_dgid[7]));
1469 }
1470
1471 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1472 {
1473         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1474
1475         if (target->state == SRP_TARGET_DEAD ||
1476             target->state == SRP_TARGET_REMOVED)
1477                 return -ENODEV;
1478
1479         return sprintf(buf, "%d\n", target->zero_req_lim);
1480 }
1481
1482 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1483 {
1484         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1485
1486         return sprintf(buf, "%d\n", target->srp_host->port);
1487 }
1488
1489 static ssize_t show_local_ib_device(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, "%s\n", target->srp_host->dev->dev->name);
1494 }
1495
1496 static CLASS_DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1497 static CLASS_DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1498 static CLASS_DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1499 static CLASS_DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1500 static CLASS_DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1501 static CLASS_DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
1502 static CLASS_DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1503 static CLASS_DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1504 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1505
1506 static struct class_device_attribute *srp_host_attrs[] = {
1507         &class_device_attr_id_ext,
1508         &class_device_attr_ioc_guid,
1509         &class_device_attr_service_id,
1510         &class_device_attr_pkey,
1511         &class_device_attr_dgid,
1512         &class_device_attr_orig_dgid,
1513         &class_device_attr_zero_req_lim,
1514         &class_device_attr_local_ib_port,
1515         &class_device_attr_local_ib_device,
1516         NULL
1517 };
1518
1519 static struct scsi_host_template srp_template = {
1520         .module                         = THIS_MODULE,
1521         .name                           = "InfiniBand SRP initiator",
1522         .proc_name                      = DRV_NAME,
1523         .info                           = srp_target_info,
1524         .queuecommand                   = srp_queuecommand,
1525         .eh_abort_handler               = srp_abort,
1526         .eh_device_reset_handler        = srp_reset_device,
1527         .eh_host_reset_handler          = srp_reset_host,
1528         .can_queue                      = SRP_SQ_SIZE,
1529         .this_id                        = -1,
1530         .cmd_per_lun                    = SRP_SQ_SIZE,
1531         .use_clustering                 = ENABLE_CLUSTERING,
1532         .shost_attrs                    = srp_host_attrs
1533 };
1534
1535 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1536 {
1537         struct srp_rport_identifiers ids;
1538         struct srp_rport *rport;
1539
1540         sprintf(target->target_name, "SRP.T10:%016llX",
1541                  (unsigned long long) be64_to_cpu(target->id_ext));
1542
1543         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1544                 return -ENODEV;
1545
1546         memcpy(ids.port_id, &target->id_ext, 8);
1547         memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1548         ids.roles = SRP_RPORT_ROLE_TARGET;
1549         rport = srp_rport_add(target->scsi_host, &ids);
1550         if (IS_ERR(rport)) {
1551                 scsi_remove_host(target->scsi_host);
1552                 return PTR_ERR(rport);
1553         }
1554
1555         spin_lock(&host->target_lock);
1556         list_add_tail(&target->list, &host->target_list);
1557         spin_unlock(&host->target_lock);
1558
1559         target->state = SRP_TARGET_LIVE;
1560
1561         scsi_scan_target(&target->scsi_host->shost_gendev,
1562                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1563
1564         return 0;
1565 }
1566
1567 static void srp_release_class_dev(struct class_device *class_dev)
1568 {
1569         struct srp_host *host =
1570                 container_of(class_dev, struct srp_host, class_dev);
1571
1572         complete(&host->released);
1573 }
1574
1575 static struct class srp_class = {
1576         .name    = "infiniband_srp",
1577         .release = srp_release_class_dev
1578 };
1579
1580 /*
1581  * Target ports are added by writing
1582  *
1583  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1584  *     pkey=<P_Key>,service_id=<service ID>
1585  *
1586  * to the add_target sysfs attribute.
1587  */
1588 enum {
1589         SRP_OPT_ERR             = 0,
1590         SRP_OPT_ID_EXT          = 1 << 0,
1591         SRP_OPT_IOC_GUID        = 1 << 1,
1592         SRP_OPT_DGID            = 1 << 2,
1593         SRP_OPT_PKEY            = 1 << 3,
1594         SRP_OPT_SERVICE_ID      = 1 << 4,
1595         SRP_OPT_MAX_SECT        = 1 << 5,
1596         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1597         SRP_OPT_IO_CLASS        = 1 << 7,
1598         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1599         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1600                                    SRP_OPT_IOC_GUID     |
1601                                    SRP_OPT_DGID         |
1602                                    SRP_OPT_PKEY         |
1603                                    SRP_OPT_SERVICE_ID),
1604 };
1605
1606 static match_table_t srp_opt_tokens = {
1607         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1608         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1609         { SRP_OPT_DGID,                 "dgid=%s"               },
1610         { SRP_OPT_PKEY,                 "pkey=%x"               },
1611         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1612         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1613         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1614         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1615         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1616         { SRP_OPT_ERR,                  NULL                    }
1617 };
1618
1619 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1620 {
1621         char *options, *sep_opt;
1622         char *p;
1623         char dgid[3];
1624         substring_t args[MAX_OPT_ARGS];
1625         int opt_mask = 0;
1626         int token;
1627         int ret = -EINVAL;
1628         int i;
1629
1630         options = kstrdup(buf, GFP_KERNEL);
1631         if (!options)
1632                 return -ENOMEM;
1633
1634         sep_opt = options;
1635         while ((p = strsep(&sep_opt, ",")) != NULL) {
1636                 if (!*p)
1637                         continue;
1638
1639                 token = match_token(p, srp_opt_tokens, args);
1640                 opt_mask |= token;
1641
1642                 switch (token) {
1643                 case SRP_OPT_ID_EXT:
1644                         p = match_strdup(args);
1645                         if (!p) {
1646                                 ret = -ENOMEM;
1647                                 goto out;
1648                         }
1649                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1650                         kfree(p);
1651                         break;
1652
1653                 case SRP_OPT_IOC_GUID:
1654                         p = match_strdup(args);
1655                         if (!p) {
1656                                 ret = -ENOMEM;
1657                                 goto out;
1658                         }
1659                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1660                         kfree(p);
1661                         break;
1662
1663                 case SRP_OPT_DGID:
1664                         p = match_strdup(args);
1665                         if (!p) {
1666                                 ret = -ENOMEM;
1667                                 goto out;
1668                         }
1669                         if (strlen(p) != 32) {
1670                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1671                                 kfree(p);
1672                                 goto out;
1673                         }
1674
1675                         for (i = 0; i < 16; ++i) {
1676                                 strlcpy(dgid, p + i * 2, 3);
1677                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1678                         }
1679                         kfree(p);
1680                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1681                         break;
1682
1683                 case SRP_OPT_PKEY:
1684                         if (match_hex(args, &token)) {
1685                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1686                                 goto out;
1687                         }
1688                         target->path.pkey = cpu_to_be16(token);
1689                         break;
1690
1691                 case SRP_OPT_SERVICE_ID:
1692                         p = match_strdup(args);
1693                         if (!p) {
1694                                 ret = -ENOMEM;
1695                                 goto out;
1696                         }
1697                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1698                         kfree(p);
1699                         break;
1700
1701                 case SRP_OPT_MAX_SECT:
1702                         if (match_int(args, &token)) {
1703                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1704                                 goto out;
1705                         }
1706                         target->scsi_host->max_sectors = token;
1707                         break;
1708
1709                 case SRP_OPT_MAX_CMD_PER_LUN:
1710                         if (match_int(args, &token)) {
1711                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1712                                 goto out;
1713                         }
1714                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1715                         break;
1716
1717                 case SRP_OPT_IO_CLASS:
1718                         if (match_hex(args, &token)) {
1719                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1720                                 goto out;
1721                         }
1722                         if (token != SRP_REV10_IB_IO_CLASS &&
1723                             token != SRP_REV16A_IB_IO_CLASS) {
1724                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1725                                        " %x specified (use %x or %x).\n",
1726                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1727                                 goto out;
1728                         }
1729                         target->io_class = token;
1730                         break;
1731
1732                 case SRP_OPT_INITIATOR_EXT:
1733                         p = match_strdup(args);
1734                         if (!p) {
1735                                 ret = -ENOMEM;
1736                                 goto out;
1737                         }
1738                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1739                         kfree(p);
1740                         break;
1741
1742                 default:
1743                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1744                                "'%s' in target creation request\n", p);
1745                         goto out;
1746                 }
1747         }
1748
1749         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1750                 ret = 0;
1751         else
1752                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1753                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1754                             !(srp_opt_tokens[i].token & opt_mask))
1755                                 printk(KERN_WARNING PFX "target creation request is "
1756                                        "missing parameter '%s'\n",
1757                                        srp_opt_tokens[i].pattern);
1758
1759 out:
1760         kfree(options);
1761         return ret;
1762 }
1763
1764 static ssize_t srp_create_target(struct class_device *class_dev,
1765                                  const char *buf, size_t count)
1766 {
1767         struct srp_host *host =
1768                 container_of(class_dev, struct srp_host, class_dev);
1769         struct Scsi_Host *target_host;
1770         struct srp_target_port *target;
1771         int ret;
1772         int i;
1773
1774         target_host = scsi_host_alloc(&srp_template,
1775                                       sizeof (struct srp_target_port));
1776         if (!target_host)
1777                 return -ENOMEM;
1778
1779         target_host->transportt = ib_srp_transport_template;
1780         target_host->max_lun     = SRP_MAX_LUN;
1781         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1782
1783         target = host_to_target(target_host);
1784
1785         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1786         target->scsi_host  = target_host;
1787         target->srp_host   = host;
1788
1789         INIT_LIST_HEAD(&target->free_reqs);
1790         INIT_LIST_HEAD(&target->req_queue);
1791         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1792                 target->req_ring[i].index = i;
1793                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1794         }
1795
1796         ret = srp_parse_options(buf, target);
1797         if (ret)
1798                 goto err;
1799
1800         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1801
1802         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1803                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1804                (unsigned long long) be64_to_cpu(target->id_ext),
1805                (unsigned long long) be64_to_cpu(target->ioc_guid),
1806                be16_to_cpu(target->path.pkey),
1807                (unsigned long long) be64_to_cpu(target->service_id),
1808                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1809                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1810                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1811                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1812                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1813                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1814                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1815                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1816
1817         ret = srp_create_target_ib(target);
1818         if (ret)
1819                 goto err;
1820
1821         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1822         if (IS_ERR(target->cm_id)) {
1823                 ret = PTR_ERR(target->cm_id);
1824                 goto err_free;
1825         }
1826
1827         target->qp_in_error = 0;
1828         ret = srp_connect_target(target);
1829         if (ret) {
1830                 printk(KERN_ERR PFX "Connection failed\n");
1831                 goto err_cm_id;
1832         }
1833
1834         ret = srp_add_target(host, target);
1835         if (ret)
1836                 goto err_disconnect;
1837
1838         return count;
1839
1840 err_disconnect:
1841         srp_disconnect_target(target);
1842
1843 err_cm_id:
1844         ib_destroy_cm_id(target->cm_id);
1845
1846 err_free:
1847         srp_free_target_ib(target);
1848
1849 err:
1850         scsi_host_put(target_host);
1851
1852         return ret;
1853 }
1854
1855 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1856
1857 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1858 {
1859         struct srp_host *host =
1860                 container_of(class_dev, struct srp_host, class_dev);
1861
1862         return sprintf(buf, "%s\n", host->dev->dev->name);
1863 }
1864
1865 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1866
1867 static ssize_t show_port(struct class_device *class_dev, char *buf)
1868 {
1869         struct srp_host *host =
1870                 container_of(class_dev, struct srp_host, class_dev);
1871
1872         return sprintf(buf, "%d\n", host->port);
1873 }
1874
1875 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1876
1877 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1878 {
1879         struct srp_host *host;
1880
1881         host = kzalloc(sizeof *host, GFP_KERNEL);
1882         if (!host)
1883                 return NULL;
1884
1885         INIT_LIST_HEAD(&host->target_list);
1886         spin_lock_init(&host->target_lock);
1887         init_completion(&host->released);
1888         host->dev  = device;
1889         host->port = port;
1890
1891         host->class_dev.class = &srp_class;
1892         host->class_dev.dev   = device->dev->dma_device;
1893         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1894                  device->dev->name, port);
1895
1896         if (class_device_register(&host->class_dev))
1897                 goto free_host;
1898         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1899                 goto err_class;
1900         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1901                 goto err_class;
1902         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1903                 goto err_class;
1904
1905         return host;
1906
1907 err_class:
1908         class_device_unregister(&host->class_dev);
1909
1910 free_host:
1911         kfree(host);
1912
1913         return NULL;
1914 }
1915
1916 static void srp_add_one(struct ib_device *device)
1917 {
1918         struct srp_device *srp_dev;
1919         struct ib_device_attr *dev_attr;
1920         struct ib_fmr_pool_param fmr_param;
1921         struct srp_host *host;
1922         int s, e, p;
1923
1924         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1925         if (!dev_attr)
1926                 return;
1927
1928         if (ib_query_device(device, dev_attr)) {
1929                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1930                        device->name);
1931                 goto free_attr;
1932         }
1933
1934         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1935         if (!srp_dev)
1936                 goto free_attr;
1937
1938         /*
1939          * Use the smallest page size supported by the HCA, down to a
1940          * minimum of 512 bytes (which is the smallest sector that a
1941          * SCSI command will ever carry).
1942          */
1943         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1944         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1945         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
1946
1947         INIT_LIST_HEAD(&srp_dev->dev_list);
1948
1949         srp_dev->dev = device;
1950         srp_dev->pd  = ib_alloc_pd(device);
1951         if (IS_ERR(srp_dev->pd))
1952                 goto free_dev;
1953
1954         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1955                                     IB_ACCESS_LOCAL_WRITE |
1956                                     IB_ACCESS_REMOTE_READ |
1957                                     IB_ACCESS_REMOTE_WRITE);
1958         if (IS_ERR(srp_dev->mr))
1959                 goto err_pd;
1960
1961         memset(&fmr_param, 0, sizeof fmr_param);
1962         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1963         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1964         fmr_param.cache             = 1;
1965         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1966         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1967         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1968                                        IB_ACCESS_REMOTE_WRITE |
1969                                        IB_ACCESS_REMOTE_READ);
1970
1971         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1972         if (IS_ERR(srp_dev->fmr_pool))
1973                 srp_dev->fmr_pool = NULL;
1974
1975         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1976                 s = 0;
1977                 e = 0;
1978         } else {
1979                 s = 1;
1980                 e = device->phys_port_cnt;
1981         }
1982
1983         for (p = s; p <= e; ++p) {
1984                 host = srp_add_port(srp_dev, p);
1985                 if (host)
1986                         list_add_tail(&host->list, &srp_dev->dev_list);
1987         }
1988
1989         ib_set_client_data(device, &srp_client, srp_dev);
1990
1991         goto free_attr;
1992
1993 err_pd:
1994         ib_dealloc_pd(srp_dev->pd);
1995
1996 free_dev:
1997         kfree(srp_dev);
1998
1999 free_attr:
2000         kfree(dev_attr);
2001 }
2002
2003 static void srp_remove_one(struct ib_device *device)
2004 {
2005         struct srp_device *srp_dev;
2006         struct srp_host *host, *tmp_host;
2007         LIST_HEAD(target_list);
2008         struct srp_target_port *target, *tmp_target;
2009
2010         srp_dev = ib_get_client_data(device, &srp_client);
2011
2012         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2013                 class_device_unregister(&host->class_dev);
2014                 /*
2015                  * Wait for the sysfs entry to go away, so that no new
2016                  * target ports can be created.
2017                  */
2018                 wait_for_completion(&host->released);
2019
2020                 /*
2021                  * Mark all target ports as removed, so we stop queueing
2022                  * commands and don't try to reconnect.
2023                  */
2024                 spin_lock(&host->target_lock);
2025                 list_for_each_entry(target, &host->target_list, list) {
2026                         spin_lock_irq(target->scsi_host->host_lock);
2027                         target->state = SRP_TARGET_REMOVED;
2028                         spin_unlock_irq(target->scsi_host->host_lock);
2029                 }
2030                 spin_unlock(&host->target_lock);
2031
2032                 /*
2033                  * Wait for any reconnection tasks that may have
2034                  * started before we marked our target ports as
2035                  * removed, and any target port removal tasks.
2036                  */
2037                 flush_scheduled_work();
2038
2039                 list_for_each_entry_safe(target, tmp_target,
2040                                          &host->target_list, list) {
2041                         scsi_remove_host(target->scsi_host);
2042                         srp_disconnect_target(target);
2043                         ib_destroy_cm_id(target->cm_id);
2044                         srp_free_target_ib(target);
2045                         scsi_host_put(target->scsi_host);
2046                 }
2047
2048                 kfree(host);
2049         }
2050
2051         if (srp_dev->fmr_pool)
2052                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2053         ib_dereg_mr(srp_dev->mr);
2054         ib_dealloc_pd(srp_dev->pd);
2055
2056         kfree(srp_dev);
2057 }
2058
2059 static struct srp_function_template ib_srp_transport_functions = {
2060 };
2061
2062 static int __init srp_init_module(void)
2063 {
2064         int ret;
2065
2066         ib_srp_transport_template =
2067                 srp_attach_transport(&ib_srp_transport_functions);
2068         if (!ib_srp_transport_template)
2069                 return -ENOMEM;
2070
2071         srp_template.sg_tablesize = srp_sg_tablesize;
2072         srp_max_iu_len = (sizeof (struct srp_cmd) +
2073                           sizeof (struct srp_indirect_buf) +
2074                           srp_sg_tablesize * 16);
2075
2076         ret = class_register(&srp_class);
2077         if (ret) {
2078                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2079                 srp_release_transport(ib_srp_transport_template);
2080                 return ret;
2081         }
2082
2083         ib_sa_register_client(&srp_sa_client);
2084
2085         ret = ib_register_client(&srp_client);
2086         if (ret) {
2087                 printk(KERN_ERR PFX "couldn't register IB client\n");
2088                 srp_release_transport(ib_srp_transport_template);
2089                 ib_sa_unregister_client(&srp_sa_client);
2090                 class_unregister(&srp_class);
2091                 return ret;
2092         }
2093
2094         return 0;
2095 }
2096
2097 static void __exit srp_cleanup_module(void)
2098 {
2099         ib_unregister_client(&srp_client);
2100         ib_sa_unregister_client(&srp_sa_client);
2101         class_unregister(&srp_class);
2102         srp_release_transport(ib_srp_transport_template);
2103 }
2104
2105 module_init(srp_init_module);
2106 module_exit(srp_cleanup_module);