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
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36 #include <linux/err.h>
  37 #include <linux/string.h>
  38 #include <linux/parser.h>
  39 #include <linux/random.h>
  40 #include <linux/jiffies.h>
  41
  42 #include <asm/atomic.h>
  43
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_device.h>
  46 #include <scsi/scsi_dbg.h>
  47 #include <scsi/srp.h>
  48 #include <scsi/scsi_transport_srp.h>
  49
  50 #include "ib_srp.h"
  51
  52 #define DRV_NAME        "ib_srp"
  53 #define PFX             DRV_NAME ": "
  54 #define DRV_VERSION     "0.2"
  55 #define DRV_RELDATE     "November 1, 2005"
  56
  57 MODULE_AUTHOR("Roland Dreier");
  58 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
  59                    "v" DRV_VERSION " (" DRV_RELDATE ")");
  60 MODULE_LICENSE("Dual BSD/GPL");
  61
  62 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
  63 static int srp_max_iu_len;
  64
  65 module_param(srp_sg_tablesize, int, 0444);
  66 MODULE_PARM_DESC(srp_sg_tablesize,
  67                  "Max number of gather/scatter entries per I/O (default is 12, max 255)");
  68
  69 static int topspin_workarounds = 1;
  70
  71 module_param(topspin_workarounds, int, 0444);
  72 MODULE_PARM_DESC(topspin_workarounds,
  73                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  74
  75 static int mellanox_workarounds = 1;
  76
  77 module_param(mellanox_workarounds, int, 0444);
  78 MODULE_PARM_DESC(mellanox_workarounds,
  79                  "Enable workarounds for Mellanox SRP target bugs if != 0");
  80
  81 static void srp_add_one(struct ib_device *device);
  82 static void srp_remove_one(struct ib_device *device);
  83 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  84 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  85
  86 static struct scsi_transport_template *ib_srp_transport_template;
  87
  88 static struct ib_client srp_client = {
  89         .name   = "srp",
  90         .add    = srp_add_one,
  91         .remove = srp_remove_one
  92 };
  93
  94 static struct ib_sa_client srp_sa_client;
  95
  96 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
  97 {
  98         return (struct srp_target_port *) host->hostdata;
  99 }
 100
 101 static const char *srp_target_info(struct Scsi_Host *host)
 102 {
 103         return host_to_target(host)->target_name;
 104 }
 105
 106 static int srp_target_is_topspin(struct srp_target_port *target)
 107 {
 108         static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
 109         static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
 110
 111         return topspin_workarounds &&
 112                 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
 113                  !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
 114 }
 115
 116 static int srp_target_is_mellanox(struct srp_target_port *target)
 117 {
 118         static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
 119
 120         return mellanox_workarounds &&
 121                 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
 122 }
 123
 124 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 125                                    gfp_t gfp_mask,
 126                                    enum dma_data_direction direction)
 127 {
 128         struct srp_iu *iu;
 129
 130         iu = kmalloc(sizeof *iu, gfp_mask);
 131         if (!iu)
 132                 goto out;
 133
 134         iu->buf = kzalloc(size, gfp_mask);
 135         if (!iu->buf)
 136                 goto out_free_iu;
 137
 138         iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
 139                                     direction);
 140         if (ib_dma_mapping_error(host->srp_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->srp_dev->dev, iu->dma, iu->size,
 162                             iu->direction);
 163         kfree(iu->buf);
 164         kfree(iu);
 165 }
 166
 167 static void srp_qp_event(struct ib_event *event, void *context)
 168 {
 169         printk(KERN_ERR PFX "QP event %d\n", event->event);
 170 }
 171
 172 static int srp_init_qp(struct srp_target_port *target,
 173                        struct ib_qp *qp)
 174 {
 175         struct ib_qp_attr *attr;
 176         int ret;
 177
 178         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 179         if (!attr)
 180                 return -ENOMEM;
 181
 182         ret = ib_find_pkey(target->srp_host->srp_dev->dev,
 183                            target->srp_host->port,
 184                            be16_to_cpu(target->path.pkey),
 185                            &attr->pkey_index);
 186         if (ret)
 187                 goto out;
 188
 189         attr->qp_state        = IB_QPS_INIT;
 190         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 191                                     IB_ACCESS_REMOTE_WRITE);
 192         attr->port_num        = target->srp_host->port;
 193
 194         ret = ib_modify_qp(qp, attr,
 195                            IB_QP_STATE          |
 196                            IB_QP_PKEY_INDEX     |
 197                            IB_QP_ACCESS_FLAGS   |
 198                            IB_QP_PORT);
 199
 200 out:
 201         kfree(attr);
 202         return ret;
 203 }
 204
 205 static int srp_new_cm_id(struct srp_target_port *target)
 206 {
 207         struct ib_cm_id *new_cm_id;
 208
 209         new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
 210                                     srp_cm_handler, target);
 211         if (IS_ERR(new_cm_id))
 212                 return PTR_ERR(new_cm_id);
 213
 214         if (target->cm_id)
 215                 ib_destroy_cm_id(target->cm_id);
 216         target->cm_id = new_cm_id;
 217
 218         return 0;
 219 }
 220
 221 static int srp_create_target_ib(struct srp_target_port *target)
 222 {
 223         struct ib_qp_init_attr *init_attr;
 224         int ret;
 225
 226         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 227         if (!init_attr)
 228                 return -ENOMEM;
 229
 230         target->cq = ib_create_cq(target->srp_host->srp_dev->dev,
 231                                   srp_completion, NULL, target, SRP_CQ_SIZE, 0);
 232         if (IS_ERR(target->cq)) {
 233                 ret = PTR_ERR(target->cq);
 234                 goto out;
 235         }
 236
 237         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 238
 239         init_attr->event_handler       = srp_qp_event;
 240         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 241         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 242         init_attr->cap.max_recv_sge    = 1;
 243         init_attr->cap.max_send_sge    = 1;
 244         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 245         init_attr->qp_type             = IB_QPT_RC;
 246         init_attr->send_cq             = target->cq;
 247         init_attr->recv_cq             = target->cq;
 248
 249         target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
 250         if (IS_ERR(target->qp)) {
 251                 ret = PTR_ERR(target->qp);
 252                 ib_destroy_cq(target->cq);
 253                 goto out;
 254         }
 255
 256         ret = srp_init_qp(target, target->qp);
 257         if (ret) {
 258                 ib_destroy_qp(target->qp);
 259                 ib_destroy_cq(target->cq);
 260                 goto out;
 261         }
 262
 263 out:
 264         kfree(init_attr);
 265         return ret;
 266 }
 267
 268 static void srp_free_target_ib(struct srp_target_port *target)
 269 {
 270         int i;
 271
 272         ib_destroy_qp(target->qp);
 273         ib_destroy_cq(target->cq);
 274
 275         for (i = 0; i < SRP_RQ_SIZE; ++i)
 276                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 277         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 278                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 279 }
 280
 281 static void srp_path_rec_completion(int status,
 282                                     struct ib_sa_path_rec *pathrec,
 283                                     void *target_ptr)
 284 {
 285         struct srp_target_port *target = target_ptr;
 286
 287         target->status = status;
 288         if (status)
 289                 shost_printk(KERN_ERR, target->scsi_host,
 290                              PFX "Got failed path rec status %d\n", status);
 291         else
 292                 target->path = *pathrec;
 293         complete(&target->done);
 294 }
 295
 296 static int srp_lookup_path(struct srp_target_port *target)
 297 {
 298         target->path.numb_path = 1;
 299
 300         init_completion(&target->done);
 301
 302         target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
 303                                                    target->srp_host->srp_dev->dev,
 304                                                    target->srp_host->port,
 305                                                    &target->path,
 306                                                    IB_SA_PATH_REC_SERVICE_ID    |
 307                                                    IB_SA_PATH_REC_DGID          |
 308                                                    IB_SA_PATH_REC_SGID          |
 309                                                    IB_SA_PATH_REC_NUMB_PATH     |
 310                                                    IB_SA_PATH_REC_PKEY,
 311                                                    SRP_PATH_REC_TIMEOUT_MS,
 312                                                    GFP_KERNEL,
 313                                                    srp_path_rec_completion,
 314                                                    target, &target->path_query);
 315         if (target->path_query_id < 0)
 316                 return target->path_query_id;
 317
 318         wait_for_completion(&target->done);
 319
 320         if (target->status < 0)
 321                 shost_printk(KERN_WARNING, target->scsi_host,
 322                              PFX "Path record query failed\n");
 323
 324         return target->status;
 325 }
 326
 327 static int srp_send_req(struct srp_target_port *target)
 328 {
 329         struct {
 330                 struct ib_cm_req_param param;
 331                 struct srp_login_req   priv;
 332         } *req = NULL;
 333         int status;
 334
 335         req = kzalloc(sizeof *req, GFP_KERNEL);
 336         if (!req)
 337                 return -ENOMEM;
 338
 339         req->param.primary_path               = &target->path;
 340         req->param.alternate_path             = NULL;
 341         req->param.service_id                 = target->service_id;
 342         req->param.qp_num                     = target->qp->qp_num;
 343         req->param.qp_type                    = target->qp->qp_type;
 344         req->param.private_data               = &req->priv;
 345         req->param.private_data_len           = sizeof req->priv;
 346         req->param.flow_control               = 1;
 347
 348         get_random_bytes(&req->param.starting_psn, 4);
 349         req->param.starting_psn              &= 0xffffff;
 350
 351         /*
 352          * Pick some arbitrary defaults here; we could make these
 353          * module parameters if anyone cared about setting them.
 354          */
 355         req->param.responder_resources        = 4;
 356         req->param.remote_cm_response_timeout = 20;
 357         req->param.local_cm_response_timeout  = 20;
 358         req->param.retry_count                = 7;
 359         req->param.rnr_retry_count            = 7;
 360         req->param.max_cm_retries             = 15;
 361
 362         req->priv.opcode        = SRP_LOGIN_REQ;
 363         req->priv.tag           = 0;
 364         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 365         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 366                                               SRP_BUF_FORMAT_INDIRECT);
 367         /*
 368          * In the published SRP specification (draft rev. 16a), the
 369          * port identifier format is 8 bytes of ID extension followed
 370          * by 8 bytes of GUID.  Older drafts put the two halves in the
 371          * opposite order, so that the GUID comes first.
 372          *
 373          * Targets conforming to these obsolete drafts can be
 374          * recognized by the I/O Class they report.
 375          */
 376         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 377                 memcpy(req->priv.initiator_port_id,
 378                        &target->path.sgid.global.interface_id, 8);
 379                 memcpy(req->priv.initiator_port_id + 8,
 380                        &target->initiator_ext, 8);
 381                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 382                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 383         } else {
 384                 memcpy(req->priv.initiator_port_id,
 385                        &target->initiator_ext, 8);
 386                 memcpy(req->priv.initiator_port_id + 8,
 387                        &target->path.sgid.global.interface_id, 8);
 388                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 389                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 390         }
 391
 392         /*
 393          * Topspin/Cisco SRP targets will reject our login unless we
 394          * zero out the first 8 bytes of our initiator port ID and set
 395          * the second 8 bytes to the local node GUID.
 396          */
 397         if (srp_target_is_topspin(target)) {
 398                 shost_printk(KERN_DEBUG, target->scsi_host,
 399                              PFX "Topspin/Cisco initiator port ID workaround "
 400                              "activated for target GUID %016llx\n",
 401                              (unsigned long long) be64_to_cpu(target->ioc_guid));
 402                 memset(req->priv.initiator_port_id, 0, 8);
 403                 memcpy(req->priv.initiator_port_id + 8,
 404                        &target->srp_host->srp_dev->dev->node_guid, 8);
 405         }
 406
 407         status = ib_send_cm_req(target->cm_id, &req->param);
 408
 409         kfree(req);
 410
 411         return status;
 412 }
 413
 414 static void srp_disconnect_target(struct srp_target_port *target)
 415 {
 416         /* XXX should send SRP_I_LOGOUT request */
 417
 418         init_completion(&target->done);
 419         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 420                 shost_printk(KERN_DEBUG, target->scsi_host,
 421                              PFX "Sending CM DREQ failed\n");
 422                 return;
 423         }
 424         wait_for_completion(&target->done);
 425 }
 426
 427 static void srp_remove_work(struct work_struct *work)
 428 {
 429         struct srp_target_port *target =
 430                 container_of(work, struct srp_target_port, work);
 431
 432         spin_lock_irq(target->scsi_host->host_lock);
 433         if (target->state != SRP_TARGET_DEAD) {
 434                 spin_unlock_irq(target->scsi_host->host_lock);
 435                 return;
 436         }
 437         target->state = SRP_TARGET_REMOVED;
 438         spin_unlock_irq(target->scsi_host->host_lock);
 439
 440         spin_lock(&target->srp_host->target_lock);
 441         list_del(&target->list);
 442         spin_unlock(&target->srp_host->target_lock);
 443
 444         srp_remove_host(target->scsi_host);
 445         scsi_remove_host(target->scsi_host);
 446         ib_destroy_cm_id(target->cm_id);
 447         srp_free_target_ib(target);
 448         scsi_host_put(target->scsi_host);
 449 }
 450
 451 static int srp_connect_target(struct srp_target_port *target)
 452 {
 453         int retries = 3;
 454         int ret;
 455
 456         ret = srp_lookup_path(target);
 457         if (ret)
 458                 return ret;
 459
 460         while (1) {
 461                 init_completion(&target->done);
 462                 ret = srp_send_req(target);
 463                 if (ret)
 464                         return ret;
 465                 wait_for_completion(&target->done);
 466
 467                 /*
 468                  * The CM event handling code will set status to
 469                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 470                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 471                  * redirect REJ back.
 472                  */
 473                 switch (target->status) {
 474                 case 0:
 475                         return 0;
 476
 477                 case SRP_PORT_REDIRECT:
 478                         ret = srp_lookup_path(target);
 479                         if (ret)
 480                                 return ret;
 481                         break;
 482
 483                 case SRP_DLID_REDIRECT:
 484                         break;
 485
 486                 case SRP_STALE_CONN:
 487                         /* Our current CM id was stale, and is now in timewait.
 488                          * Try to reconnect with a new one.
 489                          */
 490                         if (!retries-- || srp_new_cm_id(target)) {
 491                                 shost_printk(KERN_ERR, target->scsi_host, PFX
 492                                              "giving up on stale connection\n");
 493                                 target->status = -ECONNRESET;
 494                                 return target->status;
 495                         }
 496
 497                         shost_printk(KERN_ERR, target->scsi_host, PFX
 498                                      "retrying stale connection\n");
 499                         break;
 500
 501                 default:
 502                         return target->status;
 503                 }
 504         }
 505 }
 506
 507 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 508                            struct srp_target_port *target,
 509                            struct srp_request *req)
 510 {
 511         if (!scsi_sglist(scmnd) ||
 512             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 513              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 514                 return;
 515
 516         if (req->fmr) {
 517                 ib_fmr_pool_unmap(req->fmr);
 518                 req->fmr = NULL;
 519         }
 520
 521         ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
 522                         scsi_sg_count(scmnd), scmnd->sc_data_direction);
 523 }
 524
 525 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 526 {
 527         srp_unmap_data(req->scmnd, target, req);
 528         list_move_tail(&req->list, &target->free_reqs);
 529 }
 530
 531 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 532 {
 533         req->scmnd->result = DID_RESET << 16;
 534         req->scmnd->scsi_done(req->scmnd);
 535         srp_remove_req(target, req);
 536 }
 537
 538 static int srp_reconnect_target(struct srp_target_port *target)
 539 {
 540         struct ib_qp_attr qp_attr;
 541         struct srp_request *req, *tmp;
 542         struct ib_wc wc;
 543         int ret;
 544
 545         spin_lock_irq(target->scsi_host->host_lock);
 546         if (target->state != SRP_TARGET_LIVE) {
 547                 spin_unlock_irq(target->scsi_host->host_lock);
 548                 return -EAGAIN;
 549         }
 550         target->state = SRP_TARGET_CONNECTING;
 551         spin_unlock_irq(target->scsi_host->host_lock);
 552
 553         srp_disconnect_target(target);
 554         /*
 555          * Now get a new local CM ID so that we avoid confusing the
 556          * target in case things are really fouled up.
 557          */
 558         ret = srp_new_cm_id(target);
 559         if (ret)
 560                 goto err;
 561
 562         qp_attr.qp_state = IB_QPS_RESET;
 563         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 564         if (ret)
 565                 goto err;
 566
 567         ret = srp_init_qp(target, target->qp);
 568         if (ret)
 569                 goto err;
 570
 571         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 572                 ; /* nothing */
 573
 574         spin_lock_irq(target->scsi_host->host_lock);
 575         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 576                 srp_reset_req(target, req);
 577         spin_unlock_irq(target->scsi_host->host_lock);
 578
 579         target->rx_head  = 0;
 580         target->tx_head  = 0;
 581         target->tx_tail  = 0;
 582
 583         target->qp_in_error = 0;
 584         ret = srp_connect_target(target);
 585         if (ret)
 586                 goto err;
 587
 588         spin_lock_irq(target->scsi_host->host_lock);
 589         if (target->state == SRP_TARGET_CONNECTING) {
 590                 ret = 0;
 591                 target->state = SRP_TARGET_LIVE;
 592         } else
 593                 ret = -EAGAIN;
 594         spin_unlock_irq(target->scsi_host->host_lock);
 595
 596         return ret;
 597
 598 err:
 599         shost_printk(KERN_ERR, target->scsi_host,
 600                      PFX "reconnect failed (%d), removing target port.\n", ret);
 601
 602         /*
 603          * We couldn't reconnect, so kill our target port off.
 604          * However, we have to defer the real removal because we might
 605          * be in the context of the SCSI error handler now, which
 606          * would deadlock if we call scsi_remove_host().
 607          */
 608         spin_lock_irq(target->scsi_host->host_lock);
 609         if (target->state == SRP_TARGET_CONNECTING) {
 610                 target->state = SRP_TARGET_DEAD;
 611                 INIT_WORK(&target->work, srp_remove_work);
 612                 schedule_work(&target->work);
 613         }
 614         spin_unlock_irq(target->scsi_host->host_lock);
 615
 616         return ret;
 617 }
 618
 619 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 620                        int sg_cnt, struct srp_request *req,
 621                        struct srp_direct_buf *buf)
 622 {
 623         u64 io_addr = 0;
 624         u64 *dma_pages;
 625         u32 len;
 626         int page_cnt;
 627         int i, j;
 628         int ret;
 629         struct srp_device *dev = target->srp_host->srp_dev;
 630         struct ib_device *ibdev = dev->dev;
 631         struct scatterlist *sg;
 632
 633         if (!dev->fmr_pool)
 634                 return -ENODEV;
 635
 636         if (srp_target_is_mellanox(target) &&
 637             (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
 638                 return -EINVAL;
 639
 640         len = page_cnt = 0;
 641         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 642                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 643
 644                 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
 645                         if (i > 0)
 646                                 return -EINVAL;
 647                         else
 648                                 ++page_cnt;
 649                 }
 650                 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
 651                     ~dev->fmr_page_mask) {
 652                         if (i < sg_cnt - 1)
 653                                 return -EINVAL;
 654                         else
 655                                 ++page_cnt;
 656                 }
 657
 658                 len += dma_len;
 659         }
 660
 661         page_cnt += len >> dev->fmr_page_shift;
 662         if (page_cnt > SRP_FMR_SIZE)
 663                 return -ENOMEM;
 664
 665         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 666         if (!dma_pages)
 667                 return -ENOMEM;
 668
 669         page_cnt = 0;
 670         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 671                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 672
 673                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 674                         dma_pages[page_cnt++] =
 675                                 (ib_sg_dma_address(ibdev, sg) &
 676                                  dev->fmr_page_mask) + j;
 677         }
 678
 679         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 680                                         dma_pages, page_cnt, io_addr);
 681         if (IS_ERR(req->fmr)) {
 682                 ret = PTR_ERR(req->fmr);
 683                 req->fmr = NULL;
 684                 goto out;
 685         }
 686
 687         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 688                                ~dev->fmr_page_mask);
 689         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 690         buf->len = cpu_to_be32(len);
 691
 692         ret = 0;
 693
 694 out:
 695         kfree(dma_pages);
 696
 697         return ret;
 698 }
 699
 700 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 701                         struct srp_request *req)
 702 {
 703         struct scatterlist *scat;
 704         struct srp_cmd *cmd = req->cmd->buf;
 705         int len, nents, count;
 706         u8 fmt = SRP_DATA_DESC_DIRECT;
 707         struct srp_device *dev;
 708         struct ib_device *ibdev;
 709
 710         if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
 711                 return sizeof (struct srp_cmd);
 712
 713         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 714             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 715                 shost_printk(KERN_WARNING, target->scsi_host,
 716                              PFX "Unhandled data direction %d\n",
 717                              scmnd->sc_data_direction);
 718                 return -EINVAL;
 719         }
 720
 721         nents = scsi_sg_count(scmnd);
 722         scat  = scsi_sglist(scmnd);
 723
 724         dev = target->srp_host->srp_dev;
 725         ibdev = dev->dev;
 726
 727         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 728
 729         fmt = SRP_DATA_DESC_DIRECT;
 730         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 731
 732         if (count == 1) {
 733                 /*
 734                  * The midlayer only generated a single gather/scatter
 735                  * entry, or DMA mapping coalesced everything to a
 736                  * single entry.  So a direct descriptor along with
 737                  * the DMA MR suffices.
 738                  */
 739                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 740
 741                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 742                 buf->key = cpu_to_be32(dev->mr->rkey);
 743                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 744         } else if (srp_map_fmr(target, scat, count, req,
 745                                (void *) cmd->add_data)) {
 746                 /*
 747                  * FMR mapping failed, and the scatterlist has more
 748                  * than one entry.  Generate an indirect memory
 749                  * descriptor.
 750                  */
 751                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 752                 struct scatterlist *sg;
 753                 u32 datalen = 0;
 754                 int i;
 755
 756                 fmt = SRP_DATA_DESC_INDIRECT;
 757                 len = sizeof (struct srp_cmd) +
 758                         sizeof (struct srp_indirect_buf) +
 759                         count * sizeof (struct srp_direct_buf);
 760
 761                 scsi_for_each_sg(scmnd, sg, count, i) {
 762                         unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 763
 764                         buf->desc_list[i].va  =
 765                                 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
 766                         buf->desc_list[i].key =
 767                                 cpu_to_be32(dev->mr->rkey);
 768                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 769                         datalen += dma_len;
 770                 }
 771
 772                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 773                         cmd->data_out_desc_cnt = count;
 774                 else
 775                         cmd->data_in_desc_cnt = count;
 776
 777                 buf->table_desc.va  =
 778                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 779                 buf->table_desc.key =
 780                         cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
 781                 buf->table_desc.len =
 782                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 783
 784                 buf->len = cpu_to_be32(datalen);
 785         }
 786
 787         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 788                 cmd->buf_fmt = fmt << 4;
 789         else
 790                 cmd->buf_fmt = fmt;
 791
 792         return len;
 793 }
 794
 795 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 796 {
 797         struct srp_request *req;
 798         struct scsi_cmnd *scmnd;
 799         unsigned long flags;
 800         s32 delta;
 801
 802         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 803
 804         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 805
 806         target->req_lim += delta;
 807
 808         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 809
 810         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 811                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 812                         req->tsk_status = -1;
 813                 else
 814                         req->tsk_status = rsp->data[3];
 815                 complete(&req->done);
 816         } else {
 817                 scmnd = req->scmnd;
 818                 if (!scmnd)
 819                         shost_printk(KERN_ERR, target->scsi_host,
 820                                      "Null scmnd for RSP w/tag %016llx\n",
 821                                      (unsigned long long) rsp->tag);
 822                 scmnd->result = rsp->status;
 823
 824                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 825                         memcpy(scmnd->sense_buffer, rsp->data +
 826                                be32_to_cpu(rsp->resp_data_len),
 827                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 828                                      SCSI_SENSE_BUFFERSIZE));
 829                 }
 830
 831                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 832                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 833                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 834                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 835
 836                 if (!req->tsk_mgmt) {
 837                         scmnd->host_scribble = (void *) -1L;
 838                         scmnd->scsi_done(scmnd);
 839
 840                         srp_remove_req(target, req);
 841                 } else
 842                         req->cmd_done = 1;
 843         }
 844
 845         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 846 }
 847
 848 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 849 {
 850         struct ib_device *dev;
 851         struct srp_iu *iu;
 852         u8 opcode;
 853
 854         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 855
 856         dev = target->srp_host->srp_dev->dev;
 857         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 858                                    DMA_FROM_DEVICE);
 859
 860         opcode = *(u8 *) iu->buf;
 861
 862         if (0) {
 863                 int i;
 864
 865                 shost_printk(KERN_ERR, target->scsi_host,
 866                              PFX "recv completion, opcode 0x%02x\n", opcode);
 867
 868                 for (i = 0; i < wc->byte_len; ++i) {
 869                         if (i % 8 == 0)
 870                                 printk(KERN_ERR "  [%02x] ", i);
 871                         printk(" %02x", ((u8 *) iu->buf)[i]);
 872                         if ((i + 1) % 8 == 0)
 873                                 printk("\n");
 874                 }
 875
 876                 if (wc->byte_len % 8)
 877                         printk("\n");
 878         }
 879
 880         switch (opcode) {
 881         case SRP_RSP:
 882                 srp_process_rsp(target, iu->buf);
 883                 break;
 884
 885         case SRP_T_LOGOUT:
 886                 /* XXX Handle target logout */
 887                 shost_printk(KERN_WARNING, target->scsi_host,
 888                              PFX "Got target logout request\n");
 889                 break;
 890
 891         default:
 892                 shost_printk(KERN_WARNING, target->scsi_host,
 893                              PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 894                 break;
 895         }
 896
 897         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 898                                       DMA_FROM_DEVICE);
 899 }
 900
 901 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 902 {
 903         struct srp_target_port *target = target_ptr;
 904         struct ib_wc wc;
 905
 906         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 907         while (ib_poll_cq(cq, 1, &wc) > 0) {
 908                 if (wc.status) {
 909                         shost_printk(KERN_ERR, target->scsi_host,
 910                                      PFX "failed %s status %d\n",
 911                                      wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 912                                      wc.status);
 913                         target->qp_in_error = 1;
 914                         break;
 915                 }
 916
 917                 if (wc.wr_id & SRP_OP_RECV)
 918                         srp_handle_recv(target, &wc);
 919                 else
 920                         ++target->tx_tail;
 921         }
 922 }
 923
 924 static int __srp_post_recv(struct srp_target_port *target)
 925 {
 926         struct srp_iu *iu;
 927         struct ib_sge list;
 928         struct ib_recv_wr wr, *bad_wr;
 929         unsigned int next;
 930         int ret;
 931
 932         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 933         wr.wr_id = next | SRP_OP_RECV;
 934         iu       = target->rx_ring[next];
 935
 936         list.addr   = iu->dma;
 937         list.length = iu->size;
 938         list.lkey   = target->srp_host->srp_dev->mr->lkey;
 939
 940         wr.next     = NULL;
 941         wr.sg_list  = &list;
 942         wr.num_sge  = 1;
 943
 944         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 945         if (!ret)
 946                 ++target->rx_head;
 947
 948         return ret;
 949 }
 950
 951 static int srp_post_recv(struct srp_target_port *target)
 952 {
 953         unsigned long flags;
 954         int ret;
 955
 956         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 957         ret = __srp_post_recv(target);
 958         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 959
 960         return ret;
 961 }
 962
 963 /*
 964  * Must be called with target->scsi_host->host_lock held to protect
 965  * req_lim and tx_head.  Lock cannot be dropped between call here and
 966  * call to __srp_post_send().
 967  */
 968 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
 969                                         enum srp_request_type req_type)
 970 {
 971         s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
 972
 973         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 974                 return NULL;
 975
 976         if (target->req_lim < min) {
 977                 ++target->zero_req_lim;
 978                 return NULL;
 979         }
 980
 981         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 982 }
 983
 984 /*
 985  * Must be called with target->scsi_host->host_lock held to protect
 986  * req_lim and tx_head.
 987  */
 988 static int __srp_post_send(struct srp_target_port *target,
 989                            struct srp_iu *iu, int len)
 990 {
 991         struct ib_sge list;
 992         struct ib_send_wr wr, *bad_wr;
 993         int ret = 0;
 994
 995         list.addr   = iu->dma;
 996         list.length = len;
 997         list.lkey   = target->srp_host->srp_dev->mr->lkey;
 998
 999         wr.next       = NULL;
1000         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
1001         wr.sg_list    = &list;
1002         wr.num_sge    = 1;
1003         wr.opcode     = IB_WR_SEND;
1004         wr.send_flags = IB_SEND_SIGNALED;
1005
1006         ret = ib_post_send(target->qp, &wr, &bad_wr);
1007
1008         if (!ret) {
1009                 ++target->tx_head;
1010                 --target->req_lim;
1011         }
1012
1013         return ret;
1014 }
1015
1016 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1017                             void (*done)(struct scsi_cmnd *))
1018 {
1019         struct srp_target_port *target = host_to_target(scmnd->device->host);
1020         struct srp_request *req;
1021         struct srp_iu *iu;
1022         struct srp_cmd *cmd;
1023         struct ib_device *dev;
1024         int len;
1025
1026         if (target->state == SRP_TARGET_CONNECTING)
1027                 goto err;
1028
1029         if (target->state == SRP_TARGET_DEAD ||
1030             target->state == SRP_TARGET_REMOVED) {
1031                 scmnd->result = DID_BAD_TARGET << 16;
1032                 done(scmnd);
1033                 return 0;
1034         }
1035
1036         iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1037         if (!iu)
1038                 goto err;
1039
1040         dev = target->srp_host->srp_dev->dev;
1041         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1042                                    DMA_TO_DEVICE);
1043
1044         req = list_entry(target->free_reqs.next, struct srp_request, list);
1045
1046         scmnd->scsi_done     = done;
1047         scmnd->result        = 0;
1048         scmnd->host_scribble = (void *) (long) req->index;
1049
1050         cmd = iu->buf;
1051         memset(cmd, 0, sizeof *cmd);
1052
1053         cmd->opcode = SRP_CMD;
1054         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1055         cmd->tag    = req->index;
1056         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1057
1058         req->scmnd    = scmnd;
1059         req->cmd      = iu;
1060         req->cmd_done = 0;
1061         req->tsk_mgmt = NULL;
1062
1063         len = srp_map_data(scmnd, target, req);
1064         if (len < 0) {
1065                 shost_printk(KERN_ERR, target->scsi_host,
1066                              PFX "Failed to map data\n");
1067                 goto err;
1068         }
1069
1070         if (__srp_post_recv(target)) {
1071                 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1072                 goto err_unmap;
1073         }
1074
1075         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1076                                       DMA_TO_DEVICE);
1077
1078         if (__srp_post_send(target, iu, len)) {
1079                 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1080                 goto err_unmap;
1081         }
1082
1083         list_move_tail(&req->list, &target->req_queue);
1084
1085         return 0;
1086
1087 err_unmap:
1088         srp_unmap_data(scmnd, target, req);
1089
1090 err:
1091         return SCSI_MLQUEUE_HOST_BUSY;
1092 }
1093
1094 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1095 {
1096         int i;
1097
1098         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1099                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1100                                                   target->max_ti_iu_len,
1101                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1102                 if (!target->rx_ring[i])
1103                         goto err;
1104         }
1105
1106         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1107                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1108                                                   srp_max_iu_len,
1109                                                   GFP_KERNEL, DMA_TO_DEVICE);
1110                 if (!target->tx_ring[i])
1111                         goto err;
1112         }
1113
1114         return 0;
1115
1116 err:
1117         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1118                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1119                 target->rx_ring[i] = NULL;
1120         }
1121
1122         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1123                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1124                 target->tx_ring[i] = NULL;
1125         }
1126
1127         return -ENOMEM;
1128 }
1129
1130 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1131                                struct ib_cm_event *event,
1132                                struct srp_target_port *target)
1133 {
1134         struct Scsi_Host *shost = target->scsi_host;
1135         struct ib_class_port_info *cpi;
1136         int opcode;
1137
1138         switch (event->param.rej_rcvd.reason) {
1139         case IB_CM_REJ_PORT_CM_REDIRECT:
1140                 cpi = event->param.rej_rcvd.ari;
1141                 target->path.dlid = cpi->redirect_lid;
1142                 target->path.pkey = cpi->redirect_pkey;
1143                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1144                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1145
1146                 target->status = target->path.dlid ?
1147                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1148                 break;
1149
1150         case IB_CM_REJ_PORT_REDIRECT:
1151                 if (srp_target_is_topspin(target)) {
1152                         /*
1153                          * Topspin/Cisco SRP gateways incorrectly send
1154                          * reject reason code 25 when they mean 24
1155                          * (port redirect).
1156                          */
1157                         memcpy(target->path.dgid.raw,
1158                                event->param.rej_rcvd.ari, 16);
1159
1160                         shost_printk(KERN_DEBUG, shost,
1161                                      PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1162                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1163                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1164
1165                         target->status = SRP_PORT_REDIRECT;
1166                 } else {
1167                         shost_printk(KERN_WARNING, shost,
1168                                      "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1169                         target->status = -ECONNRESET;
1170                 }
1171                 break;
1172
1173         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1174                 shost_printk(KERN_WARNING, shost,
1175                             "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1176                 target->status = -ECONNRESET;
1177                 break;
1178
1179         case IB_CM_REJ_CONSUMER_DEFINED:
1180                 opcode = *(u8 *) event->private_data;
1181                 if (opcode == SRP_LOGIN_REJ) {
1182                         struct srp_login_rej *rej = event->private_data;
1183                         u32 reason = be32_to_cpu(rej->reason);
1184
1185                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1186                                 shost_printk(KERN_WARNING, shost,
1187                                              PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1188                         else
1189                                 shost_printk(KERN_WARNING, shost,
1190                                             PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1191                 } else
1192                         shost_printk(KERN_WARNING, shost,
1193                                      "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1194                                      " opcode 0x%02x\n", opcode);
1195                 target->status = -ECONNRESET;
1196                 break;
1197
1198         case IB_CM_REJ_STALE_CONN:
1199                 shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
1200                 target->status = SRP_STALE_CONN;
1201                 break;
1202
1203         default:
1204                 shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
1205                              event->param.rej_rcvd.reason);
1206                 target->status = -ECONNRESET;
1207         }
1208 }
1209
1210 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1211 {
1212         struct srp_target_port *target = cm_id->context;
1213         struct ib_qp_attr *qp_attr = NULL;
1214         int attr_mask = 0;
1215         int comp = 0;
1216         int opcode = 0;
1217
1218         switch (event->event) {
1219         case IB_CM_REQ_ERROR:
1220                 shost_printk(KERN_DEBUG, target->scsi_host,
1221                              PFX "Sending CM REQ failed\n");
1222                 comp = 1;
1223                 target->status = -ECONNRESET;
1224                 break;
1225
1226         case IB_CM_REP_RECEIVED:
1227                 comp = 1;
1228                 opcode = *(u8 *) event->private_data;
1229
1230                 if (opcode == SRP_LOGIN_RSP) {
1231                         struct srp_login_rsp *rsp = event->private_data;
1232
1233                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1234                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1235
1236                         target->scsi_host->can_queue = min(target->req_lim,
1237                                                            target->scsi_host->can_queue);
1238                 } else {
1239                         shost_printk(KERN_WARNING, target->scsi_host,
1240                                     PFX "Unhandled RSP opcode %#x\n", opcode);
1241                         target->status = -ECONNRESET;
1242                         break;
1243                 }
1244
1245                 if (!target->rx_ring[0]) {
1246                         target->status = srp_alloc_iu_bufs(target);
1247                         if (target->status)
1248                                 break;
1249                 }
1250
1251                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1252                 if (!qp_attr) {
1253                         target->status = -ENOMEM;
1254                         break;
1255                 }
1256
1257                 qp_attr->qp_state = IB_QPS_RTR;
1258                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1259                 if (target->status)
1260                         break;
1261
1262                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1263                 if (target->status)
1264                         break;
1265
1266                 target->status = srp_post_recv(target);
1267                 if (target->status)
1268                         break;
1269
1270                 qp_attr->qp_state = IB_QPS_RTS;
1271                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1272                 if (target->status)
1273                         break;
1274
1275                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1276                 if (target->status)
1277                         break;
1278
1279                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1280                 if (target->status)
1281                         break;
1282
1283                 break;
1284
1285         case IB_CM_REJ_RECEIVED:
1286                 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1287                 comp = 1;
1288
1289                 srp_cm_rej_handler(cm_id, event, target);
1290                 break;
1291
1292         case IB_CM_DREQ_RECEIVED:
1293                 shost_printk(KERN_WARNING, target->scsi_host,
1294                              PFX "DREQ received - connection closed\n");
1295                 if (ib_send_cm_drep(cm_id, NULL, 0))
1296                         shost_printk(KERN_ERR, target->scsi_host,
1297                                      PFX "Sending CM DREP failed\n");
1298                 break;
1299
1300         case IB_CM_TIMEWAIT_EXIT:
1301                 shost_printk(KERN_ERR, target->scsi_host,
1302                              PFX "connection closed\n");
1303
1304                 comp = 1;
1305                 target->status = 0;
1306                 break;
1307
1308         case IB_CM_MRA_RECEIVED:
1309         case IB_CM_DREQ_ERROR:
1310         case IB_CM_DREP_RECEIVED:
1311                 break;
1312
1313         default:
1314                 shost_printk(KERN_WARNING, target->scsi_host,
1315                              PFX "Unhandled CM event %d\n", event->event);
1316                 break;
1317         }
1318
1319         if (comp)
1320                 complete(&target->done);
1321
1322         kfree(qp_attr);
1323
1324         return 0;
1325 }
1326
1327 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1328                              struct srp_request *req, u8 func)
1329 {
1330         struct srp_iu *iu;
1331         struct srp_tsk_mgmt *tsk_mgmt;
1332
1333         spin_lock_irq(target->scsi_host->host_lock);
1334
1335         if (target->state == SRP_TARGET_DEAD ||
1336             target->state == SRP_TARGET_REMOVED) {
1337                 req->scmnd->result = DID_BAD_TARGET << 16;
1338                 goto out;
1339         }
1340
1341         init_completion(&req->done);
1342
1343         iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1344         if (!iu)
1345                 goto out;
1346
1347         tsk_mgmt = iu->buf;
1348         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1349
1350         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1351         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1352         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1353         tsk_mgmt->tsk_mgmt_func = func;
1354         tsk_mgmt->task_tag      = req->index;
1355
1356         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1357                 goto out;
1358
1359         req->tsk_mgmt = iu;
1360
1361         spin_unlock_irq(target->scsi_host->host_lock);
1362
1363         if (!wait_for_completion_timeout(&req->done,
1364                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1365                 return -1;
1366
1367         return 0;
1368
1369 out:
1370         spin_unlock_irq(target->scsi_host->host_lock);
1371         return -1;
1372 }
1373
1374 static int srp_find_req(struct srp_target_port *target,
1375                         struct scsi_cmnd *scmnd,
1376                         struct srp_request **req)
1377 {
1378         if (scmnd->host_scribble == (void *) -1L)
1379                 return -1;
1380
1381         *req = &target->req_ring[(long) scmnd->host_scribble];
1382
1383         return 0;
1384 }
1385
1386 static int srp_abort(struct scsi_cmnd *scmnd)
1387 {
1388         struct srp_target_port *target = host_to_target(scmnd->device->host);
1389         struct srp_request *req;
1390         int ret = SUCCESS;
1391
1392         shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1393
1394         if (target->qp_in_error)
1395                 return FAILED;
1396         if (srp_find_req(target, scmnd, &req))
1397                 return FAILED;
1398         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1399                 return FAILED;
1400
1401         spin_lock_irq(target->scsi_host->host_lock);
1402
1403         if (req->cmd_done) {
1404                 srp_remove_req(target, req);
1405                 scmnd->scsi_done(scmnd);
1406         } else if (!req->tsk_status) {
1407                 srp_remove_req(target, req);
1408                 scmnd->result = DID_ABORT << 16;
1409         } else
1410                 ret = FAILED;
1411
1412         spin_unlock_irq(target->scsi_host->host_lock);
1413
1414         return ret;
1415 }
1416
1417 static int srp_reset_device(struct scsi_cmnd *scmnd)
1418 {
1419         struct srp_target_port *target = host_to_target(scmnd->device->host);
1420         struct srp_request *req, *tmp;
1421
1422         shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1423
1424         if (target->qp_in_error)
1425                 return FAILED;
1426         if (srp_find_req(target, scmnd, &req))
1427                 return FAILED;
1428         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1429                 return FAILED;
1430         if (req->tsk_status)
1431                 return FAILED;
1432
1433         spin_lock_irq(target->scsi_host->host_lock);
1434
1435         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1436                 if (req->scmnd->device == scmnd->device)
1437                         srp_reset_req(target, req);
1438
1439         spin_unlock_irq(target->scsi_host->host_lock);
1440
1441         return SUCCESS;
1442 }
1443
1444 static int srp_reset_host(struct scsi_cmnd *scmnd)
1445 {
1446         struct srp_target_port *target = host_to_target(scmnd->device->host);
1447         int ret = FAILED;
1448
1449         shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1450
1451         if (!srp_reconnect_target(target))
1452                 ret = SUCCESS;
1453
1454         return ret;
1455 }
1456
1457 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1458                            char *buf)
1459 {
1460         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1461
1462         if (target->state == SRP_TARGET_DEAD ||
1463             target->state == SRP_TARGET_REMOVED)
1464                 return -ENODEV;
1465
1466         return sprintf(buf, "0x%016llx\n",
1467                        (unsigned long long) be64_to_cpu(target->id_ext));
1468 }
1469
1470 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1471                              char *buf)
1472 {
1473         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1474
1475         if (target->state == SRP_TARGET_DEAD ||
1476             target->state == SRP_TARGET_REMOVED)
1477                 return -ENODEV;
1478
1479         return sprintf(buf, "0x%016llx\n",
1480                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1481 }
1482
1483 static ssize_t show_service_id(struct device *dev,
1484                                struct device_attribute *attr, char *buf)
1485 {
1486         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1487
1488         if (target->state == SRP_TARGET_DEAD ||
1489             target->state == SRP_TARGET_REMOVED)
1490                 return -ENODEV;
1491
1492         return sprintf(buf, "0x%016llx\n",
1493                        (unsigned long long) be64_to_cpu(target->service_id));
1494 }
1495
1496 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1497                          char *buf)
1498 {
1499         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1500
1501         if (target->state == SRP_TARGET_DEAD ||
1502             target->state == SRP_TARGET_REMOVED)
1503                 return -ENODEV;
1504
1505         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1506 }
1507
1508 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1509                          char *buf)
1510 {
1511         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1512
1513         if (target->state == SRP_TARGET_DEAD ||
1514             target->state == SRP_TARGET_REMOVED)
1515                 return -ENODEV;
1516
1517         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1518                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1519                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1520                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1521                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1522                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1523                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1524                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1525                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1526 }
1527
1528 static ssize_t show_orig_dgid(struct device *dev,
1529                               struct device_attribute *attr, char *buf)
1530 {
1531         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1532
1533         if (target->state == SRP_TARGET_DEAD ||
1534             target->state == SRP_TARGET_REMOVED)
1535                 return -ENODEV;
1536
1537         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1538                        be16_to_cpu(target->orig_dgid[0]),
1539                        be16_to_cpu(target->orig_dgid[1]),
1540                        be16_to_cpu(target->orig_dgid[2]),
1541                        be16_to_cpu(target->orig_dgid[3]),
1542                        be16_to_cpu(target->orig_dgid[4]),
1543                        be16_to_cpu(target->orig_dgid[5]),
1544                        be16_to_cpu(target->orig_dgid[6]),
1545                        be16_to_cpu(target->orig_dgid[7]));
1546 }
1547
1548 static ssize_t show_zero_req_lim(struct device *dev,
1549                                  struct device_attribute *attr, char *buf)
1550 {
1551         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1552
1553         if (target->state == SRP_TARGET_DEAD ||
1554             target->state == SRP_TARGET_REMOVED)
1555                 return -ENODEV;
1556
1557         return sprintf(buf, "%d\n", target->zero_req_lim);
1558 }
1559
1560 static ssize_t show_local_ib_port(struct device *dev,
1561                                   struct device_attribute *attr, char *buf)
1562 {
1563         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1564
1565         return sprintf(buf, "%d\n", target->srp_host->port);
1566 }
1567
1568 static ssize_t show_local_ib_device(struct device *dev,
1569                                     struct device_attribute *attr, char *buf)
1570 {
1571         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1572
1573         return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1574 }
1575
1576 static DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1577 static DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1578 static DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1579 static DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1580 static DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1581 static DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
1582 static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1583 static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1584 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1585
1586 static struct device_attribute *srp_host_attrs[] = {
1587         &dev_attr_id_ext,
1588         &dev_attr_ioc_guid,
1589         &dev_attr_service_id,
1590         &dev_attr_pkey,
1591         &dev_attr_dgid,
1592         &dev_attr_orig_dgid,
1593         &dev_attr_zero_req_lim,
1594         &dev_attr_local_ib_port,
1595         &dev_attr_local_ib_device,
1596         NULL
1597 };
1598
1599 static struct scsi_host_template srp_template = {
1600         .module                         = THIS_MODULE,
1601         .name                           = "InfiniBand SRP initiator",
1602         .proc_name                      = DRV_NAME,
1603         .info                           = srp_target_info,
1604         .queuecommand                   = srp_queuecommand,
1605         .eh_abort_handler               = srp_abort,
1606         .eh_device_reset_handler        = srp_reset_device,
1607         .eh_host_reset_handler          = srp_reset_host,
1608         .can_queue                      = SRP_SQ_SIZE,
1609         .this_id                        = -1,
1610         .cmd_per_lun                    = SRP_SQ_SIZE,
1611         .use_clustering                 = ENABLE_CLUSTERING,
1612         .shost_attrs                    = srp_host_attrs
1613 };
1614
1615 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1616 {
1617         struct srp_rport_identifiers ids;
1618         struct srp_rport *rport;
1619
1620         sprintf(target->target_name, "SRP.T10:%016llX",
1621                  (unsigned long long) be64_to_cpu(target->id_ext));
1622
1623         if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1624                 return -ENODEV;
1625
1626         memcpy(ids.port_id, &target->id_ext, 8);
1627         memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1628         ids.roles = SRP_RPORT_ROLE_TARGET;
1629         rport = srp_rport_add(target->scsi_host, &ids);
1630         if (IS_ERR(rport)) {
1631                 scsi_remove_host(target->scsi_host);
1632                 return PTR_ERR(rport);
1633         }
1634
1635         spin_lock(&host->target_lock);
1636         list_add_tail(&target->list, &host->target_list);
1637         spin_unlock(&host->target_lock);
1638
1639         target->state = SRP_TARGET_LIVE;
1640
1641         scsi_scan_target(&target->scsi_host->shost_gendev,
1642                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1643
1644         return 0;
1645 }
1646
1647 static void srp_release_dev(struct device *dev)
1648 {
1649         struct srp_host *host =
1650                 container_of(dev, struct srp_host, dev);
1651
1652         complete(&host->released);
1653 }
1654
1655 static struct class srp_class = {
1656         .name    = "infiniband_srp",
1657         .dev_release = srp_release_dev
1658 };
1659
1660 /*
1661  * Target ports are added by writing
1662  *
1663  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1664  *     pkey=<P_Key>,service_id=<service ID>
1665  *
1666  * to the add_target sysfs attribute.
1667  */
1668 enum {
1669         SRP_OPT_ERR             = 0,
1670         SRP_OPT_ID_EXT          = 1 << 0,
1671         SRP_OPT_IOC_GUID        = 1 << 1,
1672         SRP_OPT_DGID            = 1 << 2,
1673         SRP_OPT_PKEY            = 1 << 3,
1674         SRP_OPT_SERVICE_ID      = 1 << 4,
1675         SRP_OPT_MAX_SECT        = 1 << 5,
1676         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1677         SRP_OPT_IO_CLASS        = 1 << 7,
1678         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1679         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1680                                    SRP_OPT_IOC_GUID     |
1681                                    SRP_OPT_DGID         |
1682                                    SRP_OPT_PKEY         |
1683                                    SRP_OPT_SERVICE_ID),
1684 };
1685
1686 static match_table_t srp_opt_tokens = {
1687         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1688         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1689         { SRP_OPT_DGID,                 "dgid=%s"               },
1690         { SRP_OPT_PKEY,                 "pkey=%x"               },
1691         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1692         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1693         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1694         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1695         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1696         { SRP_OPT_ERR,                  NULL                    }
1697 };
1698
1699 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1700 {
1701         char *options, *sep_opt;
1702         char *p;
1703         char dgid[3];
1704         substring_t args[MAX_OPT_ARGS];
1705         int opt_mask = 0;
1706         int token;
1707         int ret = -EINVAL;
1708         int i;
1709
1710         options = kstrdup(buf, GFP_KERNEL);
1711         if (!options)
1712                 return -ENOMEM;
1713
1714         sep_opt = options;
1715         while ((p = strsep(&sep_opt, ",")) != NULL) {
1716                 if (!*p)
1717                         continue;
1718
1719                 token = match_token(p, srp_opt_tokens, args);
1720                 opt_mask |= token;
1721
1722                 switch (token) {
1723                 case SRP_OPT_ID_EXT:
1724                         p = match_strdup(args);
1725                         if (!p) {
1726                                 ret = -ENOMEM;
1727                                 goto out;
1728                         }
1729                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1730                         kfree(p);
1731                         break;
1732
1733                 case SRP_OPT_IOC_GUID:
1734                         p = match_strdup(args);
1735                         if (!p) {
1736                                 ret = -ENOMEM;
1737                                 goto out;
1738                         }
1739                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1740                         kfree(p);
1741                         break;
1742
1743                 case SRP_OPT_DGID:
1744                         p = match_strdup(args);
1745                         if (!p) {
1746                                 ret = -ENOMEM;
1747                                 goto out;
1748                         }
1749                         if (strlen(p) != 32) {
1750                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1751                                 kfree(p);
1752                                 goto out;
1753                         }
1754
1755                         for (i = 0; i < 16; ++i) {
1756                                 strlcpy(dgid, p + i * 2, 3);
1757                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1758                         }
1759                         kfree(p);
1760                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1761                         break;
1762
1763                 case SRP_OPT_PKEY:
1764                         if (match_hex(args, &token)) {
1765                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1766                                 goto out;
1767                         }
1768                         target->path.pkey = cpu_to_be16(token);
1769                         break;
1770
1771                 case SRP_OPT_SERVICE_ID:
1772                         p = match_strdup(args);
1773                         if (!p) {
1774                                 ret = -ENOMEM;
1775                                 goto out;
1776                         }
1777                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1778                         target->path.service_id = target->service_id;
1779                         kfree(p);
1780                         break;
1781
1782                 case SRP_OPT_MAX_SECT:
1783                         if (match_int(args, &token)) {
1784                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1785                                 goto out;
1786                         }
1787                         target->scsi_host->max_sectors = token;
1788                         break;
1789
1790                 case SRP_OPT_MAX_CMD_PER_LUN:
1791                         if (match_int(args, &token)) {
1792                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1793                                 goto out;
1794                         }
1795                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1796                         break;
1797
1798                 case SRP_OPT_IO_CLASS:
1799                         if (match_hex(args, &token)) {
1800                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1801                                 goto out;
1802                         }
1803                         if (token != SRP_REV10_IB_IO_CLASS &&
1804                             token != SRP_REV16A_IB_IO_CLASS) {
1805                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1806                                        " %x specified (use %x or %x).\n",
1807                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1808                                 goto out;
1809                         }
1810                         target->io_class = token;
1811                         break;
1812
1813                 case SRP_OPT_INITIATOR_EXT:
1814                         p = match_strdup(args);
1815                         if (!p) {
1816                                 ret = -ENOMEM;
1817                                 goto out;
1818                         }
1819                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1820                         kfree(p);
1821                         break;
1822
1823                 default:
1824                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1825                                "'%s' in target creation request\n", p);
1826                         goto out;
1827                 }
1828         }
1829
1830         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1831                 ret = 0;
1832         else
1833                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1834                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1835                             !(srp_opt_tokens[i].token & opt_mask))
1836                                 printk(KERN_WARNING PFX "target creation request is "
1837                                        "missing parameter '%s'\n",
1838                                        srp_opt_tokens[i].pattern);
1839
1840 out:
1841         kfree(options);
1842         return ret;
1843 }
1844
1845 static ssize_t srp_create_target(struct device *dev,
1846                                  struct device_attribute *attr,
1847                                  const char *buf, size_t count)
1848 {
1849         struct srp_host *host =
1850                 container_of(dev, struct srp_host, dev);
1851         struct Scsi_Host *target_host;
1852         struct srp_target_port *target;
1853         int ret;
1854         int i;
1855
1856         target_host = scsi_host_alloc(&srp_template,
1857                                       sizeof (struct srp_target_port));
1858         if (!target_host)
1859                 return -ENOMEM;
1860
1861         target_host->transportt = ib_srp_transport_template;
1862         target_host->max_lun     = SRP_MAX_LUN;
1863         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1864
1865         target = host_to_target(target_host);
1866
1867         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1868         target->scsi_host  = target_host;
1869         target->srp_host   = host;
1870
1871         INIT_LIST_HEAD(&target->free_reqs);
1872         INIT_LIST_HEAD(&target->req_queue);
1873         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1874                 target->req_ring[i].index = i;
1875                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1876         }
1877
1878         ret = srp_parse_options(buf, target);
1879         if (ret)
1880                 goto err;
1881
1882         ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1883
1884         shost_printk(KERN_DEBUG, target->scsi_host, PFX
1885                      "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1886                      "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1887                (unsigned long long) be64_to_cpu(target->id_ext),
1888                (unsigned long long) be64_to_cpu(target->ioc_guid),
1889                be16_to_cpu(target->path.pkey),
1890                (unsigned long long) be64_to_cpu(target->service_id),
1891                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1892                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1893                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1894                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1895                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1896                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1897                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1898                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1899
1900         ret = srp_create_target_ib(target);
1901         if (ret)
1902                 goto err;
1903
1904         ret = srp_new_cm_id(target);
1905         if (ret)
1906                 goto err_free;
1907
1908         target->qp_in_error = 0;
1909         ret = srp_connect_target(target);
1910         if (ret) {
1911                 shost_printk(KERN_ERR, target->scsi_host,
1912                              PFX "Connection failed\n");
1913                 goto err_cm_id;
1914         }
1915
1916         ret = srp_add_target(host, target);
1917         if (ret)
1918                 goto err_disconnect;
1919
1920         return count;
1921
1922 err_disconnect:
1923         srp_disconnect_target(target);
1924
1925 err_cm_id:
1926         ib_destroy_cm_id(target->cm_id);
1927
1928 err_free:
1929         srp_free_target_ib(target);
1930
1931 err:
1932         scsi_host_put(target_host);
1933
1934         return ret;
1935 }
1936
1937 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1938
1939 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1940                           char *buf)
1941 {
1942         struct srp_host *host = container_of(dev, struct srp_host, dev);
1943
1944         return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1945 }
1946
1947 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1948
1949 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1950                          char *buf)
1951 {
1952         struct srp_host *host = container_of(dev, struct srp_host, dev);
1953
1954         return sprintf(buf, "%d\n", host->port);
1955 }
1956
1957 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1958
1959 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1960 {
1961         struct srp_host *host;
1962
1963         host = kzalloc(sizeof *host, GFP_KERNEL);
1964         if (!host)
1965                 return NULL;
1966
1967         INIT_LIST_HEAD(&host->target_list);
1968         spin_lock_init(&host->target_lock);
1969         init_completion(&host->released);
1970         host->srp_dev = device;
1971         host->port = port;
1972
1973         host->dev.class = &srp_class;
1974         host->dev.parent = device->dev->dma_device;
1975         snprintf(host->dev.bus_id, BUS_ID_SIZE, "srp-%s-%d",
1976                  device->dev->name, port);
1977
1978         if (device_register(&host->dev))
1979                 goto free_host;
1980         if (device_create_file(&host->dev, &dev_attr_add_target))
1981                 goto err_class;
1982         if (device_create_file(&host->dev, &dev_attr_ibdev))
1983                 goto err_class;
1984         if (device_create_file(&host->dev, &dev_attr_port))
1985                 goto err_class;
1986
1987         return host;
1988
1989 err_class:
1990         device_unregister(&host->dev);
1991
1992 free_host:
1993         kfree(host);
1994
1995         return NULL;
1996 }
1997
1998 static void srp_add_one(struct ib_device *device)
1999 {
2000         struct srp_device *srp_dev;
2001         struct ib_device_attr *dev_attr;
2002         struct ib_fmr_pool_param fmr_param;
2003         struct srp_host *host;
2004         int s, e, p;
2005
2006         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2007         if (!dev_attr)
2008                 return;
2009
2010         if (ib_query_device(device, dev_attr)) {
2011                 printk(KERN_WARNING PFX "Query device failed for %s\n",
2012                        device->name);
2013                 goto free_attr;
2014         }
2015
2016         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2017         if (!srp_dev)
2018                 goto free_attr;
2019
2020         /*
2021          * Use the smallest page size supported by the HCA, down to a
2022          * minimum of 512 bytes (which is the smallest sector that a
2023          * SCSI command will ever carry).
2024          */
2025         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2026         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
2027         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2028
2029         INIT_LIST_HEAD(&srp_dev->dev_list);
2030
2031         srp_dev->dev = device;
2032         srp_dev->pd  = ib_alloc_pd(device);
2033         if (IS_ERR(srp_dev->pd))
2034                 goto free_dev;
2035
2036         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2037                                     IB_ACCESS_LOCAL_WRITE |
2038                                     IB_ACCESS_REMOTE_READ |
2039                                     IB_ACCESS_REMOTE_WRITE);
2040         if (IS_ERR(srp_dev->mr))
2041                 goto err_pd;
2042
2043         memset(&fmr_param, 0, sizeof fmr_param);
2044         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
2045         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
2046         fmr_param.cache             = 1;
2047         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2048         fmr_param.page_shift        = srp_dev->fmr_page_shift;
2049         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
2050                                        IB_ACCESS_REMOTE_WRITE |
2051                                        IB_ACCESS_REMOTE_READ);
2052
2053         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2054         if (IS_ERR(srp_dev->fmr_pool))
2055                 srp_dev->fmr_pool = NULL;
2056
2057         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2058                 s = 0;
2059                 e = 0;
2060         } else {
2061                 s = 1;
2062                 e = device->phys_port_cnt;
2063         }
2064
2065         for (p = s; p <= e; ++p) {
2066                 host = srp_add_port(srp_dev, p);
2067                 if (host)
2068                         list_add_tail(&host->list, &srp_dev->dev_list);
2069         }
2070
2071         ib_set_client_data(device, &srp_client, srp_dev);
2072
2073         goto free_attr;
2074
2075 err_pd:
2076         ib_dealloc_pd(srp_dev->pd);
2077
2078 free_dev:
2079         kfree(srp_dev);
2080
2081 free_attr:
2082         kfree(dev_attr);
2083 }
2084
2085 static void srp_remove_one(struct ib_device *device)
2086 {
2087         struct srp_device *srp_dev;
2088         struct srp_host *host, *tmp_host;
2089         LIST_HEAD(target_list);
2090         struct srp_target_port *target, *tmp_target;
2091
2092         srp_dev = ib_get_client_data(device, &srp_client);
2093
2094         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2095                 device_unregister(&host->dev);
2096                 /*
2097                  * Wait for the sysfs entry to go away, so that no new
2098                  * target ports can be created.
2099                  */
2100                 wait_for_completion(&host->released);
2101
2102                 /*
2103                  * Mark all target ports as removed, so we stop queueing
2104                  * commands and don't try to reconnect.
2105                  */
2106                 spin_lock(&host->target_lock);
2107                 list_for_each_entry(target, &host->target_list, list) {
2108                         spin_lock_irq(target->scsi_host->host_lock);
2109                         target->state = SRP_TARGET_REMOVED;
2110                         spin_unlock_irq(target->scsi_host->host_lock);
2111                 }
2112                 spin_unlock(&host->target_lock);
2113
2114                 /*
2115                  * Wait for any reconnection tasks that may have
2116                  * started before we marked our target ports as
2117                  * removed, and any target port removal tasks.
2118                  */
2119                 flush_scheduled_work();
2120
2121                 list_for_each_entry_safe(target, tmp_target,
2122                                          &host->target_list, list) {
2123                         srp_remove_host(target->scsi_host);
2124                         scsi_remove_host(target->scsi_host);
2125                         srp_disconnect_target(target);
2126                         ib_destroy_cm_id(target->cm_id);
2127                         srp_free_target_ib(target);
2128                         scsi_host_put(target->scsi_host);
2129                 }
2130
2131                 kfree(host);
2132         }
2133
2134         if (srp_dev->fmr_pool)
2135                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2136         ib_dereg_mr(srp_dev->mr);
2137         ib_dealloc_pd(srp_dev->pd);
2138
2139         kfree(srp_dev);
2140 }
2141
2142 static struct srp_function_template ib_srp_transport_functions = {
2143 };
2144
2145 static int __init srp_init_module(void)
2146 {
2147         int ret;
2148
2149         if (srp_sg_tablesize > 255) {
2150                 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2151                 srp_sg_tablesize = 255;
2152         }
2153
2154         ib_srp_transport_template =
2155                 srp_attach_transport(&ib_srp_transport_functions);
2156         if (!ib_srp_transport_template)
2157                 return -ENOMEM;
2158
2159         srp_template.sg_tablesize = srp_sg_tablesize;
2160         srp_max_iu_len = (sizeof (struct srp_cmd) +
2161                           sizeof (struct srp_indirect_buf) +
2162                           srp_sg_tablesize * 16);
2163
2164         ret = class_register(&srp_class);
2165         if (ret) {
2166                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2167                 srp_release_transport(ib_srp_transport_template);
2168                 return ret;
2169         }
2170
2171         ib_sa_register_client(&srp_sa_client);
2172
2173         ret = ib_register_client(&srp_client);
2174         if (ret) {
2175                 printk(KERN_ERR PFX "couldn't register IB client\n");
2176                 srp_release_transport(ib_srp_transport_template);
2177                 ib_sa_unregister_client(&srp_sa_client);
2178                 class_unregister(&srp_class);
2179                 return ret;
2180         }
2181
2182         return 0;
2183 }
2184
2185 static void __exit srp_cleanup_module(void)
2186 {
2187         ib_unregister_client(&srp_client);
2188         ib_sa_unregister_client(&srp_sa_client);
2189         class_unregister(&srp_class);
2190         srp_release_transport(ib_srp_transport_template);
2191 }
2192
2193 module_init(srp_init_module);
2194 module_exit(srp_cleanup_module);