drivers/infiniband/ulp/srp/ib_srp.c

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