drivers/infiniband/ulp/srp/ib_srp.c

   1 /*
   2  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/err.h>
  39 #include <linux/string.h>
  40 #include <linux/parser.h>
  41 #include <linux/random.h>
  42 #include <linux/jiffies.h>
  43
  44 #include <asm/atomic.h>
  45
  46 #include <scsi/scsi.h>
  47 #include <scsi/scsi_device.h>
  48 #include <scsi/scsi_dbg.h>
  49 #include <scsi/srp.h>
  50
  51 #include <rdma/ib_cache.h>
  52
  53 #include "ib_srp.h"
  54
  55 #define DRV_NAME        "ib_srp"
  56 #define PFX             DRV_NAME ": "
  57 #define DRV_VERSION     "0.2"
  58 #define DRV_RELDATE     "November 1, 2005"
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
  62                    "v" DRV_VERSION " (" DRV_RELDATE ")");
  63 MODULE_LICENSE("Dual BSD/GPL");
  64
  65 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
  66 static int srp_max_iu_len;
  67
  68 module_param(srp_sg_tablesize, int, 0444);
  69 MODULE_PARM_DESC(srp_sg_tablesize,
  70                  "Max number of gather/scatter entries per I/O (default is 12)");
  71
  72 static int topspin_workarounds = 1;
  73
  74 module_param(topspin_workarounds, int, 0444);
  75 MODULE_PARM_DESC(topspin_workarounds,
  76                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  77
  78 static int mellanox_workarounds = 1;
  79
  80 module_param(mellanox_workarounds, int, 0444);
  81 MODULE_PARM_DESC(mellanox_workarounds,
  82                  "Enable workarounds for Mellanox SRP target bugs if != 0");
  83
  84 static void srp_add_one(struct ib_device *device);
  85 static void srp_remove_one(struct ib_device *device);
  86 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  87 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  88
  89 static struct ib_client srp_client = {
  90         .name   = "srp",
  91         .add    = srp_add_one,
  92         .remove = srp_remove_one
  93 };
  94
  95 static struct ib_sa_client srp_sa_client;
  96
  97 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
  98 {
  99         return (struct srp_target_port *) host->hostdata;
 100 }
 101
 102 static const char *srp_target_info(struct Scsi_Host *host)
 103 {
 104         return host_to_target(host)->target_name;
 105 }
 106
 107 static int srp_target_is_topspin(struct srp_target_port *target)
 108 {
 109         static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
 110         static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
 111
 112         return topspin_workarounds &&
 113                 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
 114                  !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
 115 }
 116
 117 static int srp_target_is_mellanox(struct srp_target_port *target)
 118 {
 119         static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
 120
 121         return mellanox_workarounds &&
 122                 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
 123 }
 124
 125 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 126                                    gfp_t gfp_mask,
 127                                    enum dma_data_direction direction)
 128 {
 129         struct srp_iu *iu;
 130
 131         iu = kmalloc(sizeof *iu, gfp_mask);
 132         if (!iu)
 133                 goto out;
 134
 135         iu->buf = kzalloc(size, gfp_mask);
 136         if (!iu->buf)
 137                 goto out_free_iu;
 138
 139         iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
 140         if (ib_dma_mapping_error(host->dev->dev, iu->dma))
 141                 goto out_free_buf;
 142
 143         iu->size      = size;
 144         iu->direction = direction;
 145
 146         return iu;
 147
 148 out_free_buf:
 149         kfree(iu->buf);
 150 out_free_iu:
 151         kfree(iu);
 152 out:
 153         return NULL;
 154 }
 155
 156 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 157 {
 158         if (!iu)
 159                 return;
 160
 161         ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
 162         kfree(iu->buf);
 163         kfree(iu);
 164 }
 165
 166 static void srp_qp_event(struct ib_event *event, void *context)
 167 {
 168         printk(KERN_ERR PFX "QP event %d\n", event->event);
 169 }
 170
 171 static int srp_init_qp(struct srp_target_port *target,
 172                        struct ib_qp *qp)
 173 {
 174         struct ib_qp_attr *attr;
 175         int ret;
 176
 177         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 178         if (!attr)
 179                 return -ENOMEM;
 180
 181         ret = ib_find_cached_pkey(target->srp_host->dev->dev,
 182                                   target->srp_host->port,
 183                                   be16_to_cpu(target->path.pkey),
 184                                   &attr->pkey_index);
 185         if (ret)
 186                 goto out;
 187
 188         attr->qp_state        = IB_QPS_INIT;
 189         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 190                                     IB_ACCESS_REMOTE_WRITE);
 191         attr->port_num        = target->srp_host->port;
 192
 193         ret = ib_modify_qp(qp, attr,
 194                            IB_QP_STATE          |
 195                            IB_QP_PKEY_INDEX     |
 196                            IB_QP_ACCESS_FLAGS   |
 197                            IB_QP_PORT);
 198
 199 out:
 200         kfree(attr);
 201         return ret;
 202 }
 203
 204 static int srp_create_target_ib(struct srp_target_port *target)
 205 {
 206         struct ib_qp_init_attr *init_attr;
 207         int ret;
 208
 209         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 210         if (!init_attr)
 211                 return -ENOMEM;
 212
 213         target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
 214                                   NULL, target, SRP_CQ_SIZE, 0);
 215         if (IS_ERR(target->cq)) {
 216                 ret = PTR_ERR(target->cq);
 217                 goto out;
 218         }
 219
 220         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 221
 222         init_attr->event_handler       = srp_qp_event;
 223         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 224         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 225         init_attr->cap.max_recv_sge    = 1;
 226         init_attr->cap.max_send_sge    = 1;
 227         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 228         init_attr->qp_type             = IB_QPT_RC;
 229         init_attr->send_cq             = target->cq;
 230         init_attr->recv_cq             = target->cq;
 231
 232         target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
 233         if (IS_ERR(target->qp)) {
 234                 ret = PTR_ERR(target->qp);
 235                 ib_destroy_cq(target->cq);
 236                 goto out;
 237         }
 238
 239         ret = srp_init_qp(target, target->qp);
 240         if (ret) {
 241                 ib_destroy_qp(target->qp);
 242                 ib_destroy_cq(target->cq);
 243                 goto out;
 244         }
 245
 246 out:
 247         kfree(init_attr);
 248         return ret;
 249 }
 250
 251 static void srp_free_target_ib(struct srp_target_port *target)
 252 {
 253         int i;
 254
 255         ib_destroy_qp(target->qp);
 256         ib_destroy_cq(target->cq);
 257
 258         for (i = 0; i < SRP_RQ_SIZE; ++i)
 259                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 260         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 261                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 262 }
 263
 264 static void srp_path_rec_completion(int status,
 265                                     struct ib_sa_path_rec *pathrec,
 266                                     void *target_ptr)
 267 {
 268         struct srp_target_port *target = target_ptr;
 269
 270         target->status = status;
 271         if (status)
 272                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
 273         else
 274                 target->path = *pathrec;
 275         complete(&target->done);
 276 }
 277
 278 static int srp_lookup_path(struct srp_target_port *target)
 279 {
 280         target->path.numb_path = 1;
 281
 282         init_completion(&target->done);
 283
 284         target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
 285                                                    target->srp_host->dev->dev,
 286                                                    target->srp_host->port,
 287                                                    &target->path,
 288                                                    IB_SA_PATH_REC_DGID          |
 289                                                    IB_SA_PATH_REC_SGID          |
 290                                                    IB_SA_PATH_REC_NUMB_PATH     |
 291                                                    IB_SA_PATH_REC_PKEY,
 292                                                    SRP_PATH_REC_TIMEOUT_MS,
 293                                                    GFP_KERNEL,
 294                                                    srp_path_rec_completion,
 295                                                    target, &target->path_query);
 296         if (target->path_query_id < 0)
 297                 return target->path_query_id;
 298
 299         wait_for_completion(&target->done);
 300
 301         if (target->status < 0)
 302                 printk(KERN_WARNING PFX "Path record query failed\n");
 303
 304         return target->status;
 305 }
 306
 307 static int srp_send_req(struct srp_target_port *target)
 308 {
 309         struct {
 310                 struct ib_cm_req_param param;
 311                 struct srp_login_req   priv;
 312         } *req = NULL;
 313         int status;
 314
 315         req = kzalloc(sizeof *req, GFP_KERNEL);
 316         if (!req)
 317                 return -ENOMEM;
 318
 319         req->param.primary_path               = &target->path;
 320         req->param.alternate_path             = NULL;
 321         req->param.service_id                 = target->service_id;
 322         req->param.qp_num                     = target->qp->qp_num;
 323         req->param.qp_type                    = target->qp->qp_type;
 324         req->param.private_data               = &req->priv;
 325         req->param.private_data_len           = sizeof req->priv;
 326         req->param.flow_control               = 1;
 327
 328         get_random_bytes(&req->param.starting_psn, 4);
 329         req->param.starting_psn              &= 0xffffff;
 330
 331         /*
 332          * Pick some arbitrary defaults here; we could make these
 333          * module parameters if anyone cared about setting them.
 334          */
 335         req->param.responder_resources        = 4;
 336         req->param.remote_cm_response_timeout = 20;
 337         req->param.local_cm_response_timeout  = 20;
 338         req->param.retry_count                = 7;
 339         req->param.rnr_retry_count            = 7;
 340         req->param.max_cm_retries             = 15;
 341
 342         req->priv.opcode        = SRP_LOGIN_REQ;
 343         req->priv.tag           = 0;
 344         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 345         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 346                                               SRP_BUF_FORMAT_INDIRECT);
 347         /*
 348          * In the published SRP specification (draft rev. 16a), the
 349          * port identifier format is 8 bytes of ID extension followed
 350          * by 8 bytes of GUID.  Older drafts put the two halves in the
 351          * opposite order, so that the GUID comes first.
 352          *
 353          * Targets conforming to these obsolete drafts can be
 354          * recognized by the I/O Class they report.
 355          */
 356         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 357                 memcpy(req->priv.initiator_port_id,
 358                        &target->path.sgid.global.interface_id, 8);
 359                 memcpy(req->priv.initiator_port_id + 8,
 360                        &target->initiator_ext, 8);
 361                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 362                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 363         } else {
 364                 memcpy(req->priv.initiator_port_id,
 365                        &target->initiator_ext, 8);
 366                 memcpy(req->priv.initiator_port_id + 8,
 367                        &target->path.sgid.global.interface_id, 8);
 368                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 369                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 370         }
 371
 372         /*
 373          * Topspin/Cisco SRP targets will reject our login unless we
 374          * zero out the first 8 bytes of our initiator port ID and set
 375          * the second 8 bytes to the local node GUID.
 376          */
 377         if (srp_target_is_topspin(target)) {
 378                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 379                        "activated for target GUID %016llx\n",
 380                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 381                 memset(req->priv.initiator_port_id, 0, 8);
 382                 memcpy(req->priv.initiator_port_id + 8,
 383                        &target->srp_host->dev->dev->node_guid, 8);
 384         }
 385
 386         status = ib_send_cm_req(target->cm_id, &req->param);
 387
 388         kfree(req);
 389
 390         return status;
 391 }
 392
 393 static void srp_disconnect_target(struct srp_target_port *target)
 394 {
 395         /* XXX should send SRP_I_LOGOUT request */
 396
 397         init_completion(&target->done);
 398         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 399                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 400                 return;
 401         }
 402         wait_for_completion(&target->done);
 403 }
 404
 405 static void srp_remove_work(struct work_struct *work)
 406 {
 407         struct srp_target_port *target =
 408                 container_of(work, struct srp_target_port, work);
 409
 410         spin_lock_irq(target->scsi_host->host_lock);
 411         if (target->state != SRP_TARGET_DEAD) {
 412                 spin_unlock_irq(target->scsi_host->host_lock);
 413                 return;
 414         }
 415         target->state = SRP_TARGET_REMOVED;
 416         spin_unlock_irq(target->scsi_host->host_lock);
 417
 418         spin_lock(&target->srp_host->target_lock);
 419         list_del(&target->list);
 420         spin_unlock(&target->srp_host->target_lock);
 421
 422         scsi_remove_host(target->scsi_host);
 423         ib_destroy_cm_id(target->cm_id);
 424         srp_free_target_ib(target);
 425         scsi_host_put(target->scsi_host);
 426 }
 427
 428 static int srp_connect_target(struct srp_target_port *target)
 429 {
 430         int ret;
 431
 432         ret = srp_lookup_path(target);
 433         if (ret)
 434                 return ret;
 435
 436         while (1) {
 437                 init_completion(&target->done);
 438                 ret = srp_send_req(target);
 439                 if (ret)
 440                         return ret;
 441                 wait_for_completion(&target->done);
 442
 443                 /*
 444                  * The CM event handling code will set status to
 445                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 446                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 447                  * redirect REJ back.
 448                  */
 449                 switch (target->status) {
 450                 case 0:
 451                         return 0;
 452
 453                 case SRP_PORT_REDIRECT:
 454                         ret = srp_lookup_path(target);
 455                         if (ret)
 456                                 return ret;
 457                         break;
 458
 459                 case SRP_DLID_REDIRECT:
 460                         break;
 461
 462                 default:
 463                         return target->status;
 464                 }
 465         }
 466 }
 467
 468 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 469                            struct srp_target_port *target,
 470                            struct srp_request *req)
 471 {
 472         if (!scsi_sglist(scmnd) ||
 473             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 474              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 475                 return;
 476
 477         if (req->fmr) {
 478                 ib_fmr_pool_unmap(req->fmr);
 479                 req->fmr = NULL;
 480         }
 481
 482         ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
 483                         scsi_sg_count(scmnd), scmnd->sc_data_direction);
 484 }
 485
 486 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 487 {
 488         srp_unmap_data(req->scmnd, target, req);
 489         list_move_tail(&req->list, &target->free_reqs);
 490 }
 491
 492 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 493 {
 494         req->scmnd->result = DID_RESET << 16;
 495         req->scmnd->scsi_done(req->scmnd);
 496         srp_remove_req(target, req);
 497 }
 498
 499 static int srp_reconnect_target(struct srp_target_port *target)
 500 {
 501         struct ib_cm_id *new_cm_id;
 502         struct ib_qp_attr qp_attr;
 503         struct srp_request *req, *tmp;
 504         struct ib_wc wc;
 505         int ret;
 506
 507         spin_lock_irq(target->scsi_host->host_lock);
 508         if (target->state != SRP_TARGET_LIVE) {
 509                 spin_unlock_irq(target->scsi_host->host_lock);
 510                 return -EAGAIN;
 511         }
 512         target->state = SRP_TARGET_CONNECTING;
 513         spin_unlock_irq(target->scsi_host->host_lock);
 514
 515         srp_disconnect_target(target);
 516         /*
 517          * Now get a new local CM ID so that we avoid confusing the
 518          * target in case things are really fouled up.
 519          */
 520         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 521                                     srp_cm_handler, target);
 522         if (IS_ERR(new_cm_id)) {
 523                 ret = PTR_ERR(new_cm_id);
 524                 goto err;
 525         }
 526         ib_destroy_cm_id(target->cm_id);
 527         target->cm_id = new_cm_id;
 528
 529         qp_attr.qp_state = IB_QPS_RESET;
 530         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 531         if (ret)
 532                 goto err;
 533
 534         ret = srp_init_qp(target, target->qp);
 535         if (ret)
 536                 goto err;
 537
 538         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 539                 ; /* nothing */
 540
 541         spin_lock_irq(target->scsi_host->host_lock);
 542         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 543                 srp_reset_req(target, req);
 544         spin_unlock_irq(target->scsi_host->host_lock);
 545
 546         target->rx_head  = 0;
 547         target->tx_head  = 0;
 548         target->tx_tail  = 0;
 549
 550         target->qp_in_error = 0;
 551         ret = srp_connect_target(target);
 552         if (ret)
 553                 goto err;
 554
 555         spin_lock_irq(target->scsi_host->host_lock);
 556         if (target->state == SRP_TARGET_CONNECTING) {
 557                 ret = 0;
 558                 target->state = SRP_TARGET_LIVE;
 559         } else
 560                 ret = -EAGAIN;
 561         spin_unlock_irq(target->scsi_host->host_lock);
 562
 563         return ret;
 564
 565 err:
 566         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 567
 568         /*
 569          * We couldn't reconnect, so kill our target port off.
 570          * However, we have to defer the real removal because we might
 571          * be in the context of the SCSI error handler now, which
 572          * would deadlock if we call scsi_remove_host().
 573          */
 574         spin_lock_irq(target->scsi_host->host_lock);
 575         if (target->state == SRP_TARGET_CONNECTING) {
 576                 target->state = SRP_TARGET_DEAD;
 577                 INIT_WORK(&target->work, srp_remove_work);
 578                 schedule_work(&target->work);
 579         }
 580         spin_unlock_irq(target->scsi_host->host_lock);
 581
 582         return ret;
 583 }
 584
 585 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 586                        int sg_cnt, struct srp_request *req,
 587                        struct srp_direct_buf *buf)
 588 {
 589         u64 io_addr = 0;
 590         u64 *dma_pages;
 591         u32 len;
 592         int page_cnt;
 593         int i, j;
 594         int ret;
 595         struct srp_device *dev = target->srp_host->dev;
 596         struct ib_device *ibdev = dev->dev;
 597         struct scatterlist *sg;
 598
 599         if (!dev->fmr_pool)
 600                 return -ENODEV;
 601
 602         if (srp_target_is_mellanox(target) &&
 603             (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
 604                 return -EINVAL;
 605
 606         len = page_cnt = 0;
 607         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 608                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 609
 610                 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
 611                         if (i > 0)
 612                                 return -EINVAL;
 613                         else
 614                                 ++page_cnt;
 615                 }
 616                 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
 617                     ~dev->fmr_page_mask) {
 618                         if (i < sg_cnt - 1)
 619                                 return -EINVAL;
 620                         else
 621                                 ++page_cnt;
 622                 }
 623
 624                 len += dma_len;
 625         }
 626
 627         page_cnt += len >> dev->fmr_page_shift;
 628         if (page_cnt > SRP_FMR_SIZE)
 629                 return -ENOMEM;
 630
 631         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 632         if (!dma_pages)
 633                 return -ENOMEM;
 634
 635         page_cnt = 0;
 636         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 637                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 638
 639                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 640                         dma_pages[page_cnt++] =
 641                                 (ib_sg_dma_address(ibdev, sg) &
 642                                  dev->fmr_page_mask) + j;
 643         }
 644
 645         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 646                                         dma_pages, page_cnt, io_addr);
 647         if (IS_ERR(req->fmr)) {
 648                 ret = PTR_ERR(req->fmr);
 649                 req->fmr = NULL;
 650                 goto out;
 651         }
 652
 653         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 654                                ~dev->fmr_page_mask);
 655         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 656         buf->len = cpu_to_be32(len);
 657
 658         ret = 0;
 659
 660 out:
 661         kfree(dma_pages);
 662
 663         return ret;
 664 }
 665
 666 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 667                         struct srp_request *req)
 668 {
 669         struct scatterlist *scat;
 670         struct srp_cmd *cmd = req->cmd->buf;
 671         int len, nents, count;
 672         u8 fmt = SRP_DATA_DESC_DIRECT;
 673         struct srp_device *dev;
 674         struct ib_device *ibdev;
 675
 676         if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
 677                 return sizeof (struct srp_cmd);
 678
 679         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 680             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 681                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 682                        scmnd->sc_data_direction);
 683                 return -EINVAL;
 684         }
 685
 686         nents = scsi_sg_count(scmnd);
 687         scat  = scsi_sglist(scmnd);
 688
 689         dev = target->srp_host->dev;
 690         ibdev = dev->dev;
 691
 692         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 693
 694         fmt = SRP_DATA_DESC_DIRECT;
 695         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 696
 697         if (count == 1) {
 698                 /*
 699                  * The midlayer only generated a single gather/scatter
 700                  * entry, or DMA mapping coalesced everything to a
 701                  * single entry.  So a direct descriptor along with
 702                  * the DMA MR suffices.
 703                  */
 704                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 705
 706                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 707                 buf->key = cpu_to_be32(dev->mr->rkey);
 708                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 709         } else if (srp_map_fmr(target, scat, count, req,
 710                                (void *) cmd->add_data)) {
 711                 /*
 712                  * FMR mapping failed, and the scatterlist has more
 713                  * than one entry.  Generate an indirect memory
 714                  * descriptor.
 715                  */
 716                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 717                 struct scatterlist *sg;
 718                 u32 datalen = 0;
 719                 int i;
 720
 721                 fmt = SRP_DATA_DESC_INDIRECT;
 722                 len = sizeof (struct srp_cmd) +
 723                         sizeof (struct srp_indirect_buf) +
 724                         count * sizeof (struct srp_direct_buf);
 725
 726                 scsi_for_each_sg(scmnd, sg, count, i) {
 727                         unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 728
 729                         buf->desc_list[i].va  =
 730                                 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
 731                         buf->desc_list[i].key =
 732                                 cpu_to_be32(dev->mr->rkey);
 733                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 734                         datalen += dma_len;
 735                 }
 736
 737                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 738                         cmd->data_out_desc_cnt = count;
 739                 else
 740                         cmd->data_in_desc_cnt = count;
 741
 742                 buf->table_desc.va  =
 743                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 744                 buf->table_desc.key =
 745                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 746                 buf->table_desc.len =
 747                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 748
 749                 buf->len = cpu_to_be32(datalen);
 750         }
 751
 752         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 753                 cmd->buf_fmt = fmt << 4;
 754         else
 755                 cmd->buf_fmt = fmt;
 756
 757         return len;
 758 }
 759
 760 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 761 {
 762         struct srp_request *req;
 763         struct scsi_cmnd *scmnd;
 764         unsigned long flags;
 765         s32 delta;
 766
 767         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 768
 769         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 770
 771         target->req_lim += delta;
 772
 773         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 774
 775         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 776                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 777                         req->tsk_status = -1;
 778                 else
 779                         req->tsk_status = rsp->data[3];
 780                 complete(&req->done);
 781         } else {
 782                 scmnd = req->scmnd;
 783                 if (!scmnd)
 784                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 785                                (unsigned long long) rsp->tag);
 786                 scmnd->result = rsp->status;
 787
 788                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 789                         memcpy(scmnd->sense_buffer, rsp->data +
 790                                be32_to_cpu(rsp->resp_data_len),
 791                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 792                                      SCSI_SENSE_BUFFERSIZE));
 793                 }
 794
 795                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 796                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 797                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 798                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 799
 800                 if (!req->tsk_mgmt) {
 801                         scmnd->host_scribble = (void *) -1L;
 802                         scmnd->scsi_done(scmnd);
 803
 804                         srp_remove_req(target, req);
 805                 } else
 806                         req->cmd_done = 1;
 807         }
 808
 809         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 810 }
 811
 812 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 813 {
 814         struct ib_device *dev;
 815         struct srp_iu *iu;
 816         u8 opcode;
 817
 818         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 819
 820         dev = target->srp_host->dev->dev;
 821         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 822                                    DMA_FROM_DEVICE);
 823
 824         opcode = *(u8 *) iu->buf;
 825
 826         if (0) {
 827                 int i;
 828
 829                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 830
 831                 for (i = 0; i < wc->byte_len; ++i) {
 832                         if (i % 8 == 0)
 833                                 printk(KERN_ERR "  [%02x] ", i);
 834                         printk(" %02x", ((u8 *) iu->buf)[i]);
 835                         if ((i + 1) % 8 == 0)
 836                                 printk("\n");
 837                 }
 838
 839                 if (wc->byte_len % 8)
 840                         printk("\n");
 841         }
 842
 843         switch (opcode) {
 844         case SRP_RSP:
 845                 srp_process_rsp(target, iu->buf);
 846                 break;
 847
 848         case SRP_T_LOGOUT:
 849                 /* XXX Handle target logout */
 850                 printk(KERN_WARNING PFX "Got target logout request\n");
 851                 break;
 852
 853         default:
 854                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 855                 break;
 856         }
 857
 858         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 859                                       DMA_FROM_DEVICE);
 860 }
 861
 862 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 863 {
 864         struct srp_target_port *target = target_ptr;
 865         struct ib_wc wc;
 866
 867         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 868         while (ib_poll_cq(cq, 1, &wc) > 0) {
 869                 if (wc.status) {
 870                         printk(KERN_ERR PFX "failed %s status %d\n",
 871                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 872                                wc.status);
 873                         target->qp_in_error = 1;
 874                         break;
 875                 }
 876
 877                 if (wc.wr_id & SRP_OP_RECV)
 878                         srp_handle_recv(target, &wc);
 879                 else
 880                         ++target->tx_tail;
 881         }
 882 }
 883
 884 static int __srp_post_recv(struct srp_target_port *target)
 885 {
 886         struct srp_iu *iu;
 887         struct ib_sge list;
 888         struct ib_recv_wr wr, *bad_wr;
 889         unsigned int next;
 890         int ret;
 891
 892         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 893         wr.wr_id = next | SRP_OP_RECV;
 894         iu       = target->rx_ring[next];
 895
 896         list.addr   = iu->dma;
 897         list.length = iu->size;
 898         list.lkey   = target->srp_host->dev->mr->lkey;
 899
 900         wr.next     = NULL;
 901         wr.sg_list  = &list;
 902         wr.num_sge  = 1;
 903
 904         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 905         if (!ret)
 906                 ++target->rx_head;
 907
 908         return ret;
 909 }
 910
 911 static int srp_post_recv(struct srp_target_port *target)
 912 {
 913         unsigned long flags;
 914         int ret;
 915
 916         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 917         ret = __srp_post_recv(target);
 918         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 919
 920         return ret;
 921 }
 922
 923 /*
 924  * Must be called with target->scsi_host->host_lock held to protect
 925  * req_lim and tx_head.  Lock cannot be dropped between call here and
 926  * call to __srp_post_send().
 927  */
 928 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 929 {
 930         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 931                 return NULL;
 932
 933         if (unlikely(target->req_lim < 1))
 934                 ++target->zero_req_lim;
 935
 936         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 937 }
 938
 939 /*
 940  * Must be called with target->scsi_host->host_lock held to protect
 941  * req_lim and tx_head.
 942  */
 943 static int __srp_post_send(struct srp_target_port *target,
 944                            struct srp_iu *iu, int len)
 945 {
 946         struct ib_sge list;
 947         struct ib_send_wr wr, *bad_wr;
 948         int ret = 0;
 949
 950         list.addr   = iu->dma;
 951         list.length = len;
 952         list.lkey   = target->srp_host->dev->mr->lkey;
 953
 954         wr.next       = NULL;
 955         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 956         wr.sg_list    = &list;
 957         wr.num_sge    = 1;
 958         wr.opcode     = IB_WR_SEND;
 959         wr.send_flags = IB_SEND_SIGNALED;
 960
 961         ret = ib_post_send(target->qp, &wr, &bad_wr);
 962
 963         if (!ret) {
 964                 ++target->tx_head;
 965                 --target->req_lim;
 966         }
 967
 968         return ret;
 969 }
 970
 971 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 972                             void (*done)(struct scsi_cmnd *))
 973 {
 974         struct srp_target_port *target = host_to_target(scmnd->device->host);
 975         struct srp_request *req;
 976         struct srp_iu *iu;
 977         struct srp_cmd *cmd;
 978         struct ib_device *dev;
 979         int len;
 980
 981         if (target->state == SRP_TARGET_CONNECTING)
 982                 goto err;
 983
 984         if (target->state == SRP_TARGET_DEAD ||
 985             target->state == SRP_TARGET_REMOVED) {
 986                 scmnd->result = DID_BAD_TARGET << 16;
 987                 done(scmnd);
 988                 return 0;
 989         }
 990
 991         iu = __srp_get_tx_iu(target);
 992         if (!iu)
 993                 goto err;
 994
 995         dev = target->srp_host->dev->dev;
 996         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
 997                                    DMA_TO_DEVICE);
 998
 999         req = list_entry(target->free_reqs.next, struct srp_request, list);
1000
1001         scmnd->scsi_done     = done;
1002         scmnd->result        = 0;
1003         scmnd->host_scribble = (void *) (long) req->index;
1004
1005         cmd = iu->buf;
1006         memset(cmd, 0, sizeof *cmd);
1007
1008         cmd->opcode = SRP_CMD;
1009         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1010         cmd->tag    = req->index;
1011         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1012
1013         req->scmnd    = scmnd;
1014         req->cmd      = iu;
1015         req->cmd_done = 0;
1016         req->tsk_mgmt = NULL;
1017
1018         len = srp_map_data(scmnd, target, req);
1019         if (len < 0) {
1020                 printk(KERN_ERR PFX "Failed to map data\n");
1021                 goto err;
1022         }
1023
1024         if (__srp_post_recv(target)) {
1025                 printk(KERN_ERR PFX "Recv failed\n");
1026                 goto err_unmap;
1027         }
1028
1029         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1030                                       DMA_TO_DEVICE);
1031
1032         if (__srp_post_send(target, iu, len)) {
1033                 printk(KERN_ERR PFX "Send failed\n");
1034                 goto err_unmap;
1035         }
1036
1037         list_move_tail(&req->list, &target->req_queue);
1038
1039         return 0;
1040
1041 err_unmap:
1042         srp_unmap_data(scmnd, target, req);
1043
1044 err:
1045         return SCSI_MLQUEUE_HOST_BUSY;
1046 }
1047
1048 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1049 {
1050         int i;
1051
1052         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1053                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1054                                                   target->max_ti_iu_len,
1055                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1056                 if (!target->rx_ring[i])
1057                         goto err;
1058         }
1059
1060         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1061                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1062                                                   srp_max_iu_len,
1063                                                   GFP_KERNEL, DMA_TO_DEVICE);
1064                 if (!target->tx_ring[i])
1065                         goto err;
1066         }
1067
1068         return 0;
1069
1070 err:
1071         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1072                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1073                 target->rx_ring[i] = NULL;
1074         }
1075
1076         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1077                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1078                 target->tx_ring[i] = NULL;
1079         }
1080
1081         return -ENOMEM;
1082 }
1083
1084 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1085                                struct ib_cm_event *event,
1086                                struct srp_target_port *target)
1087 {
1088         struct ib_class_port_info *cpi;
1089         int opcode;
1090
1091         switch (event->param.rej_rcvd.reason) {
1092         case IB_CM_REJ_PORT_CM_REDIRECT:
1093                 cpi = event->param.rej_rcvd.ari;
1094                 target->path.dlid = cpi->redirect_lid;
1095                 target->path.pkey = cpi->redirect_pkey;
1096                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1097                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1098
1099                 target->status = target->path.dlid ?
1100                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1101                 break;
1102
1103         case IB_CM_REJ_PORT_REDIRECT:
1104                 if (srp_target_is_topspin(target)) {
1105                         /*
1106                          * Topspin/Cisco SRP gateways incorrectly send
1107                          * reject reason code 25 when they mean 24
1108                          * (port redirect).
1109                          */
1110                         memcpy(target->path.dgid.raw,
1111                                event->param.rej_rcvd.ari, 16);
1112
1113                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1114                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1115                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1116
1117                         target->status = SRP_PORT_REDIRECT;
1118                 } else {
1119                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1120                         target->status = -ECONNRESET;
1121                 }
1122                 break;
1123
1124         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1125                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1126                 target->status = -ECONNRESET;
1127                 break;
1128
1129         case IB_CM_REJ_CONSUMER_DEFINED:
1130                 opcode = *(u8 *) event->private_data;
1131                 if (opcode == SRP_LOGIN_REJ) {
1132                         struct srp_login_rej *rej = event->private_data;
1133                         u32 reason = be32_to_cpu(rej->reason);
1134
1135                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1136                                 printk(KERN_WARNING PFX
1137                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1138                         else
1139                                 printk(KERN_WARNING PFX
1140                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1141                 } else
1142                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1143                                " opcode 0x%02x\n", opcode);
1144                 target->status = -ECONNRESET;
1145                 break;
1146
1147         default:
1148                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1149                        event->param.rej_rcvd.reason);
1150                 target->status = -ECONNRESET;
1151         }
1152 }
1153
1154 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1155 {
1156         struct srp_target_port *target = cm_id->context;
1157         struct ib_qp_attr *qp_attr = NULL;
1158         int attr_mask = 0;
1159         int comp = 0;
1160         int opcode = 0;
1161
1162         switch (event->event) {
1163         case IB_CM_REQ_ERROR:
1164                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1165                 comp = 1;
1166                 target->status = -ECONNRESET;
1167                 break;
1168
1169         case IB_CM_REP_RECEIVED:
1170                 comp = 1;
1171                 opcode = *(u8 *) event->private_data;
1172
1173                 if (opcode == SRP_LOGIN_RSP) {
1174                         struct srp_login_rsp *rsp = event->private_data;
1175
1176                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1177                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1178
1179                         target->scsi_host->can_queue = min(target->req_lim,
1180                                                            target->scsi_host->can_queue);
1181                 } else {
1182                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1183                         target->status = -ECONNRESET;
1184                         break;
1185                 }
1186
1187                 if (!target->rx_ring[0]) {
1188                         target->status = srp_alloc_iu_bufs(target);
1189                         if (target->status)
1190                                 break;
1191                 }
1192
1193                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1194                 if (!qp_attr) {
1195                         target->status = -ENOMEM;
1196                         break;
1197                 }
1198
1199                 qp_attr->qp_state = IB_QPS_RTR;
1200                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1201                 if (target->status)
1202                         break;
1203
1204                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1205                 if (target->status)
1206                         break;
1207
1208                 target->status = srp_post_recv(target);
1209                 if (target->status)
1210                         break;
1211
1212                 qp_attr->qp_state = IB_QPS_RTS;
1213                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1214                 if (target->status)
1215                         break;
1216
1217                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1218                 if (target->status)
1219                         break;
1220
1221                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1222                 if (target->status)
1223                         break;
1224
1225                 break;
1226
1227         case IB_CM_REJ_RECEIVED:
1228                 printk(KERN_DEBUG PFX "REJ received\n");
1229                 comp = 1;
1230
1231                 srp_cm_rej_handler(cm_id, event, target);
1232                 break;
1233
1234         case IB_CM_DREQ_RECEIVED:
1235                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1236                 if (ib_send_cm_drep(cm_id, NULL, 0))
1237                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1238                 break;
1239
1240         case IB_CM_TIMEWAIT_EXIT:
1241                 printk(KERN_ERR PFX "connection closed\n");
1242
1243                 comp = 1;
1244                 target->status = 0;
1245                 break;
1246
1247         case IB_CM_MRA_RECEIVED:
1248         case IB_CM_DREQ_ERROR:
1249         case IB_CM_DREP_RECEIVED:
1250                 break;
1251
1252         default:
1253                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1254                 break;
1255         }
1256
1257         if (comp)
1258                 complete(&target->done);
1259
1260         kfree(qp_attr);
1261
1262         return 0;
1263 }
1264
1265 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1266                              struct srp_request *req, u8 func)
1267 {
1268         struct srp_iu *iu;
1269         struct srp_tsk_mgmt *tsk_mgmt;
1270
1271         spin_lock_irq(target->scsi_host->host_lock);
1272
1273         if (target->state == SRP_TARGET_DEAD ||
1274             target->state == SRP_TARGET_REMOVED) {
1275                 req->scmnd->result = DID_BAD_TARGET << 16;
1276                 goto out;
1277         }
1278
1279         init_completion(&req->done);
1280
1281         iu = __srp_get_tx_iu(target);
1282         if (!iu)
1283                 goto out;
1284
1285         tsk_mgmt = iu->buf;
1286         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1287
1288         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1289         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1290         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1291         tsk_mgmt->tsk_mgmt_func = func;
1292         tsk_mgmt->task_tag      = req->index;
1293
1294         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1295                 goto out;
1296
1297         req->tsk_mgmt = iu;
1298
1299         spin_unlock_irq(target->scsi_host->host_lock);
1300
1301         if (!wait_for_completion_timeout(&req->done,
1302                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1303                 return -1;
1304
1305         return 0;
1306
1307 out:
1308         spin_unlock_irq(target->scsi_host->host_lock);
1309         return -1;
1310 }
1311
1312 static int srp_find_req(struct srp_target_port *target,
1313                         struct scsi_cmnd *scmnd,
1314                         struct srp_request **req)
1315 {
1316         if (scmnd->host_scribble == (void *) -1L)
1317                 return -1;
1318
1319         *req = &target->req_ring[(long) scmnd->host_scribble];
1320
1321         return 0;
1322 }
1323
1324 static int srp_abort(struct scsi_cmnd *scmnd)
1325 {
1326         struct srp_target_port *target = host_to_target(scmnd->device->host);
1327         struct srp_request *req;
1328         int ret = SUCCESS;
1329
1330         printk(KERN_ERR "SRP abort called\n");
1331
1332         if (target->qp_in_error)
1333                 return FAILED;
1334         if (srp_find_req(target, scmnd, &req))
1335                 return FAILED;
1336         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1337                 return FAILED;
1338
1339         spin_lock_irq(target->scsi_host->host_lock);
1340
1341         if (req->cmd_done) {
1342                 srp_remove_req(target, req);
1343                 scmnd->scsi_done(scmnd);
1344         } else if (!req->tsk_status) {
1345                 srp_remove_req(target, req);
1346                 scmnd->result = DID_ABORT << 16;
1347         } else
1348                 ret = FAILED;
1349
1350         spin_unlock_irq(target->scsi_host->host_lock);
1351
1352         return ret;
1353 }
1354
1355 static int srp_reset_device(struct scsi_cmnd *scmnd)
1356 {
1357         struct srp_target_port *target = host_to_target(scmnd->device->host);
1358         struct srp_request *req, *tmp;
1359
1360         printk(KERN_ERR "SRP reset_device called\n");
1361
1362         if (target->qp_in_error)
1363                 return FAILED;
1364         if (srp_find_req(target, scmnd, &req))
1365                 return FAILED;
1366         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1367                 return FAILED;
1368         if (req->tsk_status)
1369                 return FAILED;
1370
1371         spin_lock_irq(target->scsi_host->host_lock);
1372
1373         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1374                 if (req->scmnd->device == scmnd->device)
1375                         srp_reset_req(target, req);
1376
1377         spin_unlock_irq(target->scsi_host->host_lock);
1378
1379         return SUCCESS;
1380 }
1381
1382 static int srp_reset_host(struct scsi_cmnd *scmnd)
1383 {
1384         struct srp_target_port *target = host_to_target(scmnd->device->host);
1385         int ret = FAILED;
1386
1387         printk(KERN_ERR PFX "SRP reset_host called\n");
1388
1389         if (!srp_reconnect_target(target))
1390                 ret = SUCCESS;
1391
1392         return ret;
1393 }
1394
1395 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1396 {
1397         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1398
1399         if (target->state == SRP_TARGET_DEAD ||
1400             target->state == SRP_TARGET_REMOVED)
1401                 return -ENODEV;
1402
1403         return sprintf(buf, "0x%016llx\n",
1404                        (unsigned long long) be64_to_cpu(target->id_ext));
1405 }
1406
1407 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1408 {
1409         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1410
1411         if (target->state == SRP_TARGET_DEAD ||
1412             target->state == SRP_TARGET_REMOVED)
1413                 return -ENODEV;
1414
1415         return sprintf(buf, "0x%016llx\n",
1416                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1417 }
1418
1419 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1420 {
1421         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1422
1423         if (target->state == SRP_TARGET_DEAD ||
1424             target->state == SRP_TARGET_REMOVED)
1425                 return -ENODEV;
1426
1427         return sprintf(buf, "0x%016llx\n",
1428                        (unsigned long long) be64_to_cpu(target->service_id));
1429 }
1430
1431 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1432 {
1433         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1434
1435         if (target->state == SRP_TARGET_DEAD ||
1436             target->state == SRP_TARGET_REMOVED)
1437                 return -ENODEV;
1438
1439         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1440 }
1441
1442 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1443 {
1444         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1445
1446         if (target->state == SRP_TARGET_DEAD ||
1447             target->state == SRP_TARGET_REMOVED)
1448                 return -ENODEV;
1449
1450         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1451                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1452                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1453                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1454                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1455                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1456                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1457                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1458                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1459 }
1460
1461 static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1462 {
1463         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1464
1465         if (target->state == SRP_TARGET_DEAD ||
1466             target->state == SRP_TARGET_REMOVED)
1467                 return -ENODEV;
1468
1469         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1470                        be16_to_cpu(target->orig_dgid[0]),
1471                        be16_to_cpu(target->orig_dgid[1]),
1472                        be16_to_cpu(target->orig_dgid[2]),
1473                        be16_to_cpu(target->orig_dgid[3]),
1474                        be16_to_cpu(target->orig_dgid[4]),
1475                        be16_to_cpu(target->orig_dgid[5]),
1476                        be16_to_cpu(target->orig_dgid[6]),
1477                        be16_to_cpu(target->orig_dgid[7]));
1478 }
1479
1480 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1481 {
1482         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1483
1484         if (target->state == SRP_TARGET_DEAD ||
1485             target->state == SRP_TARGET_REMOVED)
1486                 return -ENODEV;
1487
1488         return sprintf(buf, "%d\n", target->zero_req_lim);
1489 }
1490
1491 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1492 {
1493         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1494
1495         return sprintf(buf, "%d\n", target->srp_host->port);
1496 }
1497
1498 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1499 {
1500         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1501
1502         return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1503 }
1504
1505 static CLASS_DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1506 static CLASS_DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1507 static CLASS_DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1508 static CLASS_DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1509 static CLASS_DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1510 static CLASS_DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
1511 static CLASS_DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1512 static CLASS_DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1513 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1514
1515 static struct class_device_attribute *srp_host_attrs[] = {
1516         &class_device_attr_id_ext,
1517         &class_device_attr_ioc_guid,
1518         &class_device_attr_service_id,
1519         &class_device_attr_pkey,
1520         &class_device_attr_dgid,
1521         &class_device_attr_orig_dgid,
1522         &class_device_attr_zero_req_lim,
1523         &class_device_attr_local_ib_port,
1524         &class_device_attr_local_ib_device,
1525         NULL
1526 };
1527
1528 static struct scsi_host_template srp_template = {
1529         .module                         = THIS_MODULE,
1530         .name                           = "InfiniBand SRP initiator",
1531         .proc_name                      = DRV_NAME,
1532         .info                           = srp_target_info,
1533         .queuecommand                   = srp_queuecommand,
1534         .eh_abort_handler               = srp_abort,
1535         .eh_device_reset_handler        = srp_reset_device,
1536         .eh_host_reset_handler          = srp_reset_host,
1537         .can_queue                      = SRP_SQ_SIZE,
1538         .this_id                        = -1,
1539         .cmd_per_lun                    = SRP_SQ_SIZE,
1540         .use_clustering                 = ENABLE_CLUSTERING,
1541         .shost_attrs                    = srp_host_attrs
1542 };
1543
1544 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1545 {
1546         sprintf(target->target_name, "SRP.T10:%016llX",
1547                  (unsigned long long) be64_to_cpu(target->id_ext));
1548
1549         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1550                 return -ENODEV;
1551
1552         spin_lock(&host->target_lock);
1553         list_add_tail(&target->list, &host->target_list);
1554         spin_unlock(&host->target_lock);
1555
1556         target->state = SRP_TARGET_LIVE;
1557
1558         scsi_scan_target(&target->scsi_host->shost_gendev,
1559                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1560
1561         return 0;
1562 }
1563
1564 static void srp_release_class_dev(struct class_device *class_dev)
1565 {
1566         struct srp_host *host =
1567                 container_of(class_dev, struct srp_host, class_dev);
1568
1569         complete(&host->released);
1570 }
1571
1572 static struct class srp_class = {
1573         .name    = "infiniband_srp",
1574         .release = srp_release_class_dev
1575 };
1576
1577 /*
1578  * Target ports are added by writing
1579  *
1580  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1581  *     pkey=<P_Key>,service_id=<service ID>
1582  *
1583  * to the add_target sysfs attribute.
1584  */
1585 enum {
1586         SRP_OPT_ERR             = 0,
1587         SRP_OPT_ID_EXT          = 1 << 0,
1588         SRP_OPT_IOC_GUID        = 1 << 1,
1589         SRP_OPT_DGID            = 1 << 2,
1590         SRP_OPT_PKEY            = 1 << 3,
1591         SRP_OPT_SERVICE_ID      = 1 << 4,
1592         SRP_OPT_MAX_SECT        = 1 << 5,
1593         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1594         SRP_OPT_IO_CLASS        = 1 << 7,
1595         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1596         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1597                                    SRP_OPT_IOC_GUID     |
1598                                    SRP_OPT_DGID         |
1599                                    SRP_OPT_PKEY         |
1600                                    SRP_OPT_SERVICE_ID),
1601 };
1602
1603 static match_table_t srp_opt_tokens = {
1604         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1605         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1606         { SRP_OPT_DGID,                 "dgid=%s"               },
1607         { SRP_OPT_PKEY,                 "pkey=%x"               },
1608         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1609         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1610         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1611         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1612         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1613         { SRP_OPT_ERR,                  NULL                    }
1614 };
1615
1616 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1617 {
1618         char *options, *sep_opt;
1619         char *p;
1620         char dgid[3];
1621         substring_t args[MAX_OPT_ARGS];
1622         int opt_mask = 0;
1623         int token;
1624         int ret = -EINVAL;
1625         int i;
1626
1627         options = kstrdup(buf, GFP_KERNEL);
1628         if (!options)
1629                 return -ENOMEM;
1630
1631         sep_opt = options;
1632         while ((p = strsep(&sep_opt, ",")) != NULL) {
1633                 if (!*p)
1634                         continue;
1635
1636                 token = match_token(p, srp_opt_tokens, args);
1637                 opt_mask |= token;
1638
1639                 switch (token) {
1640                 case SRP_OPT_ID_EXT:
1641                         p = match_strdup(args);
1642                         if (!p) {
1643                                 ret = -ENOMEM;
1644                                 goto out;
1645                         }
1646                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1647                         kfree(p);
1648                         break;
1649
1650                 case SRP_OPT_IOC_GUID:
1651                         p = match_strdup(args);
1652                         if (!p) {
1653                                 ret = -ENOMEM;
1654                                 goto out;
1655                         }
1656                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1657                         kfree(p);
1658                         break;
1659
1660                 case SRP_OPT_DGID:
1661                         p = match_strdup(args);
1662                         if (!p) {
1663                                 ret = -ENOMEM;
1664                                 goto out;
1665                         }
1666                         if (strlen(p) != 32) {
1667                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1668                                 kfree(p);
1669                                 goto out;
1670                         }
1671
1672                         for (i = 0; i < 16; ++i) {
1673                                 strlcpy(dgid, p + i * 2, 3);
1674                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1675                         }
1676                         kfree(p);
1677                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1678                         break;
1679
1680                 case SRP_OPT_PKEY:
1681                         if (match_hex(args, &token)) {
1682                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1683                                 goto out;
1684                         }
1685                         target->path.pkey = cpu_to_be16(token);
1686                         break;
1687
1688                 case SRP_OPT_SERVICE_ID:
1689                         p = match_strdup(args);
1690                         if (!p) {
1691                                 ret = -ENOMEM;
1692                                 goto out;
1693                         }
1694                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1695                         kfree(p);
1696                         break;
1697
1698                 case SRP_OPT_MAX_SECT:
1699                         if (match_int(args, &token)) {
1700                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1701                                 goto out;
1702                         }
1703                         target->scsi_host->max_sectors = token;
1704                         break;
1705
1706                 case SRP_OPT_MAX_CMD_PER_LUN:
1707                         if (match_int(args, &token)) {
1708                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1709                                 goto out;
1710                         }
1711                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1712                         break;
1713
1714                 case SRP_OPT_IO_CLASS:
1715                         if (match_hex(args, &token)) {
1716                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1717                                 goto out;
1718                         }
1719                         if (token != SRP_REV10_IB_IO_CLASS &&
1720                             token != SRP_REV16A_IB_IO_CLASS) {
1721                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1722                                        " %x specified (use %x or %x).\n",
1723                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1724                                 goto out;
1725                         }
1726                         target->io_class = token;
1727                         break;
1728
1729                 case SRP_OPT_INITIATOR_EXT:
1730                         p = match_strdup(args);
1731                         if (!p) {
1732                                 ret = -ENOMEM;
1733                                 goto out;
1734                         }
1735                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1736                         kfree(p);
1737                         break;
1738
1739                 default:
1740                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1741                                "'%s' in target creation request\n", p);
1742                         goto out;
1743                 }
1744         }
1745
1746         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1747                 ret = 0;
1748         else
1749                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1750                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1751                             !(srp_opt_tokens[i].token & opt_mask))
1752                                 printk(KERN_WARNING PFX "target creation request is "
1753                                        "missing parameter '%s'\n",
1754                                        srp_opt_tokens[i].pattern);
1755
1756 out:
1757         kfree(options);
1758         return ret;
1759 }
1760
1761 static ssize_t srp_create_target(struct class_device *class_dev,
1762                                  const char *buf, size_t count)
1763 {
1764         struct srp_host *host =
1765                 container_of(class_dev, struct srp_host, class_dev);
1766         struct Scsi_Host *target_host;
1767         struct srp_target_port *target;
1768         int ret;
1769         int i;
1770
1771         target_host = scsi_host_alloc(&srp_template,
1772                                       sizeof (struct srp_target_port));
1773         if (!target_host)
1774                 return -ENOMEM;
1775
1776         target_host->max_lun     = SRP_MAX_LUN;
1777         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1778
1779         target = host_to_target(target_host);
1780
1781         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1782         target->scsi_host  = target_host;
1783         target->srp_host   = host;
1784
1785         INIT_LIST_HEAD(&target->free_reqs);
1786         INIT_LIST_HEAD(&target->req_queue);
1787         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1788                 target->req_ring[i].index = i;
1789                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1790         }
1791
1792         ret = srp_parse_options(buf, target);
1793         if (ret)
1794                 goto err;
1795
1796         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1797
1798         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1799                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1800                (unsigned long long) be64_to_cpu(target->id_ext),
1801                (unsigned long long) be64_to_cpu(target->ioc_guid),
1802                be16_to_cpu(target->path.pkey),
1803                (unsigned long long) be64_to_cpu(target->service_id),
1804                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1805                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1806                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1807                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1808                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1809                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1810                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1811                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1812
1813         ret = srp_create_target_ib(target);
1814         if (ret)
1815                 goto err;
1816
1817         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1818         if (IS_ERR(target->cm_id)) {
1819                 ret = PTR_ERR(target->cm_id);
1820                 goto err_free;
1821         }
1822
1823         target->qp_in_error = 0;
1824         ret = srp_connect_target(target);
1825         if (ret) {
1826                 printk(KERN_ERR PFX "Connection failed\n");
1827                 goto err_cm_id;
1828         }
1829
1830         ret = srp_add_target(host, target);
1831         if (ret)
1832                 goto err_disconnect;
1833
1834         return count;
1835
1836 err_disconnect:
1837         srp_disconnect_target(target);
1838
1839 err_cm_id:
1840         ib_destroy_cm_id(target->cm_id);
1841
1842 err_free:
1843         srp_free_target_ib(target);
1844
1845 err:
1846         scsi_host_put(target_host);
1847
1848         return ret;
1849 }
1850
1851 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1852
1853 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1854 {
1855         struct srp_host *host =
1856                 container_of(class_dev, struct srp_host, class_dev);
1857
1858         return sprintf(buf, "%s\n", host->dev->dev->name);
1859 }
1860
1861 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1862
1863 static ssize_t show_port(struct class_device *class_dev, char *buf)
1864 {
1865         struct srp_host *host =
1866                 container_of(class_dev, struct srp_host, class_dev);
1867
1868         return sprintf(buf, "%d\n", host->port);
1869 }
1870
1871 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1872
1873 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1874 {
1875         struct srp_host *host;
1876
1877         host = kzalloc(sizeof *host, GFP_KERNEL);
1878         if (!host)
1879                 return NULL;
1880
1881         INIT_LIST_HEAD(&host->target_list);
1882         spin_lock_init(&host->target_lock);
1883         init_completion(&host->released);
1884         host->dev  = device;
1885         host->port = port;
1886
1887         host->class_dev.class = &srp_class;
1888         host->class_dev.dev   = device->dev->dma_device;
1889         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1890                  device->dev->name, port);
1891
1892         if (class_device_register(&host->class_dev))
1893                 goto free_host;
1894         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1895                 goto err_class;
1896         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1897                 goto err_class;
1898         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1899                 goto err_class;
1900
1901         return host;
1902
1903 err_class:
1904         class_device_unregister(&host->class_dev);
1905
1906 free_host:
1907         kfree(host);
1908
1909         return NULL;
1910 }
1911
1912 static void srp_add_one(struct ib_device *device)
1913 {
1914         struct srp_device *srp_dev;
1915         struct ib_device_attr *dev_attr;
1916         struct ib_fmr_pool_param fmr_param;
1917         struct srp_host *host;
1918         int s, e, p;
1919
1920         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1921         if (!dev_attr)
1922                 return;
1923
1924         if (ib_query_device(device, dev_attr)) {
1925                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1926                        device->name);
1927                 goto free_attr;
1928         }
1929
1930         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1931         if (!srp_dev)
1932                 goto free_attr;
1933
1934         /*
1935          * Use the smallest page size supported by the HCA, down to a
1936          * minimum of 512 bytes (which is the smallest sector that a
1937          * SCSI command will ever carry).
1938          */
1939         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1940         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1941         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
1942
1943         INIT_LIST_HEAD(&srp_dev->dev_list);
1944
1945         srp_dev->dev = device;
1946         srp_dev->pd  = ib_alloc_pd(device);
1947         if (IS_ERR(srp_dev->pd))
1948                 goto free_dev;
1949
1950         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1951                                     IB_ACCESS_LOCAL_WRITE |
1952                                     IB_ACCESS_REMOTE_READ |
1953                                     IB_ACCESS_REMOTE_WRITE);
1954         if (IS_ERR(srp_dev->mr))
1955                 goto err_pd;
1956
1957         memset(&fmr_param, 0, sizeof fmr_param);
1958         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1959         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1960         fmr_param.cache             = 1;
1961         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1962         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1963         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1964                                        IB_ACCESS_REMOTE_WRITE |
1965                                        IB_ACCESS_REMOTE_READ);
1966
1967         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1968         if (IS_ERR(srp_dev->fmr_pool))
1969                 srp_dev->fmr_pool = NULL;
1970
1971         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1972                 s = 0;
1973                 e = 0;
1974         } else {
1975                 s = 1;
1976                 e = device->phys_port_cnt;
1977         }
1978
1979         for (p = s; p <= e; ++p) {
1980                 host = srp_add_port(srp_dev, p);
1981                 if (host)
1982                         list_add_tail(&host->list, &srp_dev->dev_list);
1983         }
1984
1985         ib_set_client_data(device, &srp_client, srp_dev);
1986
1987         goto free_attr;
1988
1989 err_pd:
1990         ib_dealloc_pd(srp_dev->pd);
1991
1992 free_dev:
1993         kfree(srp_dev);
1994
1995 free_attr:
1996         kfree(dev_attr);
1997 }
1998
1999 static void srp_remove_one(struct ib_device *device)
2000 {
2001         struct srp_device *srp_dev;
2002         struct srp_host *host, *tmp_host;
2003         LIST_HEAD(target_list);
2004         struct srp_target_port *target, *tmp_target;
2005
2006         srp_dev = ib_get_client_data(device, &srp_client);
2007
2008         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2009                 class_device_unregister(&host->class_dev);
2010                 /*
2011                  * Wait for the sysfs entry to go away, so that no new
2012                  * target ports can be created.
2013                  */
2014                 wait_for_completion(&host->released);
2015
2016                 /*
2017                  * Mark all target ports as removed, so we stop queueing
2018                  * commands and don't try to reconnect.
2019                  */
2020                 spin_lock(&host->target_lock);
2021                 list_for_each_entry(target, &host->target_list, list) {
2022                         spin_lock_irq(target->scsi_host->host_lock);
2023                         target->state = SRP_TARGET_REMOVED;
2024                         spin_unlock_irq(target->scsi_host->host_lock);
2025                 }
2026                 spin_unlock(&host->target_lock);
2027
2028                 /*
2029                  * Wait for any reconnection tasks that may have
2030                  * started before we marked our target ports as
2031                  * removed, and any target port removal tasks.
2032                  */
2033                 flush_scheduled_work();
2034
2035                 list_for_each_entry_safe(target, tmp_target,
2036                                          &host->target_list, list) {
2037                         scsi_remove_host(target->scsi_host);
2038                         srp_disconnect_target(target);
2039                         ib_destroy_cm_id(target->cm_id);
2040                         srp_free_target_ib(target);
2041                         scsi_host_put(target->scsi_host);
2042                 }
2043
2044                 kfree(host);
2045         }
2046
2047         if (srp_dev->fmr_pool)
2048                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2049         ib_dereg_mr(srp_dev->mr);
2050         ib_dealloc_pd(srp_dev->pd);
2051
2052         kfree(srp_dev);
2053 }
2054
2055 static int __init srp_init_module(void)
2056 {
2057         int ret;
2058
2059         srp_template.sg_tablesize = srp_sg_tablesize;
2060         srp_max_iu_len = (sizeof (struct srp_cmd) +
2061                           sizeof (struct srp_indirect_buf) +
2062                           srp_sg_tablesize * 16);
2063
2064         ret = class_register(&srp_class);
2065         if (ret) {
2066                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2067                 return ret;
2068         }
2069
2070         ib_sa_register_client(&srp_sa_client);
2071
2072         ret = ib_register_client(&srp_client);
2073         if (ret) {
2074                 printk(KERN_ERR PFX "couldn't register IB client\n");
2075                 ib_sa_unregister_client(&srp_sa_client);
2076                 class_unregister(&srp_class);
2077                 return ret;
2078         }
2079
2080         return 0;
2081 }
2082
2083 static void __exit srp_cleanup_module(void)
2084 {
2085         ib_unregister_client(&srp_client);
2086         ib_sa_unregister_client(&srp_sa_client);
2087         class_unregister(&srp_class);
2088 }
2089
2090 module_init(srp_init_module);
2091 module_exit(srp_cleanup_module);