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_recv_completion(struct ib_cq *cq, void *target_ptr);
  84 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
  85 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  86
  87 static struct scsi_transport_template *ib_srp_transport_template;
  88
  89 static struct ib_client srp_client = {
  90         .name   = "srp",
  91         .add    = srp_add_one,
  92         .remove = srp_remove_one
  93 };
  94
  95 static struct ib_sa_client srp_sa_client;
  96
  97 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
  98 {
  99         return (struct srp_target_port *) host->hostdata;
 100 }
 101
 102 static const char *srp_target_info(struct Scsi_Host *host)
 103 {
 104         return host_to_target(host)->target_name;
 105 }
 106
 107 static int srp_target_is_topspin(struct srp_target_port *target)
 108 {
 109         static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
 110         static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
 111
 112         return topspin_workarounds &&
 113                 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
 114                  !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
 115 }
 116
 117 static int srp_target_is_mellanox(struct srp_target_port *target)
 118 {
 119         static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
 120
 121         return mellanox_workarounds &&
 122                 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
 123 }
 124
 125 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 126                                    gfp_t gfp_mask,
 127                                    enum dma_data_direction direction)
 128 {
 129         struct srp_iu *iu;
 130
 131         iu = kmalloc(sizeof *iu, gfp_mask);
 132         if (!iu)
 133                 goto out;
 134
 135         iu->buf = kzalloc(size, gfp_mask);
 136         if (!iu->buf)
 137                 goto out_free_iu;
 138
 139         iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
 140                                     direction);
 141         if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
 142                 goto out_free_buf;
 143
 144         iu->size      = size;
 145         iu->direction = direction;
 146
 147         return iu;
 148
 149 out_free_buf:
 150         kfree(iu->buf);
 151 out_free_iu:
 152         kfree(iu);
 153 out:
 154         return NULL;
 155 }
 156
 157 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 158 {
 159         if (!iu)
 160                 return;
 161
 162         ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
 163                             iu->direction);
 164         kfree(iu->buf);
 165         kfree(iu);
 166 }
 167
 168 static void srp_qp_event(struct ib_event *event, void *context)
 169 {
 170         printk(KERN_ERR PFX "QP event %d\n", event->event);
 171 }
 172
 173 static int srp_init_qp(struct srp_target_port *target,
 174                        struct ib_qp *qp)
 175 {
 176         struct ib_qp_attr *attr;
 177         int ret;
 178
 179         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 180         if (!attr)
 181                 return -ENOMEM;
 182
 183         ret = ib_find_pkey(target->srp_host->srp_dev->dev,
 184                            target->srp_host->port,
 185                            be16_to_cpu(target->path.pkey),
 186                            &attr->pkey_index);
 187         if (ret)
 188                 goto out;
 189
 190         attr->qp_state        = IB_QPS_INIT;
 191         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 192                                     IB_ACCESS_REMOTE_WRITE);
 193         attr->port_num        = target->srp_host->port;
 194
 195         ret = ib_modify_qp(qp, attr,
 196                            IB_QP_STATE          |
 197                            IB_QP_PKEY_INDEX     |
 198                            IB_QP_ACCESS_FLAGS   |
 199                            IB_QP_PORT);
 200
 201 out:
 202         kfree(attr);
 203         return ret;
 204 }
 205
 206 static int srp_new_cm_id(struct srp_target_port *target)
 207 {
 208         struct ib_cm_id *new_cm_id;
 209
 210         new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
 211                                     srp_cm_handler, target);
 212         if (IS_ERR(new_cm_id))
 213                 return PTR_ERR(new_cm_id);
 214
 215         if (target->cm_id)
 216                 ib_destroy_cm_id(target->cm_id);
 217         target->cm_id = new_cm_id;
 218
 219         return 0;
 220 }
 221
 222 static int srp_create_target_ib(struct srp_target_port *target)
 223 {
 224         struct ib_qp_init_attr *init_attr;
 225         int ret;
 226
 227         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 228         if (!init_attr)
 229                 return -ENOMEM;
 230
 231         target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
 232                                        srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
 233         if (IS_ERR(target->recv_cq)) {
 234                 ret = PTR_ERR(target->recv_cq);
 235                 goto err;
 236         }
 237
 238         target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
 239                                        srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
 240         if (IS_ERR(target->send_cq)) {
 241                 ret = PTR_ERR(target->send_cq);
 242                 goto err_recv_cq;
 243         }
 244
 245         ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
 246
 247         init_attr->event_handler       = srp_qp_event;
 248         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 249         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 250         init_attr->cap.max_recv_sge    = 1;
 251         init_attr->cap.max_send_sge    = 1;
 252         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 253         init_attr->qp_type             = IB_QPT_RC;
 254         init_attr->send_cq             = target->send_cq;
 255         init_attr->recv_cq             = target->recv_cq;
 256
 257         target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
 258         if (IS_ERR(target->qp)) {
 259                 ret = PTR_ERR(target->qp);
 260                 goto err_send_cq;
 261         }
 262
 263         ret = srp_init_qp(target, target->qp);
 264         if (ret)
 265                 goto err_qp;
 266
 267         kfree(init_attr);
 268         return 0;
 269
 270 err_qp:
 271         ib_destroy_qp(target->qp);
 272
 273 err_send_cq:
 274         ib_destroy_cq(target->send_cq);
 275
 276 err_recv_cq:
 277         ib_destroy_cq(target->recv_cq);
 278
 279 err:
 280         kfree(init_attr);
 281         return ret;
 282 }
 283
 284 static void srp_free_target_ib(struct srp_target_port *target)
 285 {
 286         int i;
 287
 288         ib_destroy_qp(target->qp);
 289         ib_destroy_cq(target->send_cq);
 290         ib_destroy_cq(target->recv_cq);
 291
 292         for (i = 0; i < SRP_RQ_SIZE; ++i)
 293                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 294         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 295                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 296 }
 297
 298 static void srp_path_rec_completion(int status,
 299                                     struct ib_sa_path_rec *pathrec,
 300                                     void *target_ptr)
 301 {
 302         struct srp_target_port *target = target_ptr;
 303
 304         target->status = status;
 305         if (status)
 306                 shost_printk(KERN_ERR, target->scsi_host,
 307                              PFX "Got failed path rec status %d\n", status);
 308         else
 309                 target->path = *pathrec;
 310         complete(&target->done);
 311 }
 312
 313 static int srp_lookup_path(struct srp_target_port *target)
 314 {
 315         target->path.numb_path = 1;
 316
 317         init_completion(&target->done);
 318
 319         target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
 320                                                    target->srp_host->srp_dev->dev,
 321                                                    target->srp_host->port,
 322                                                    &target->path,
 323                                                    IB_SA_PATH_REC_SERVICE_ID    |
 324                                                    IB_SA_PATH_REC_DGID          |
 325                                                    IB_SA_PATH_REC_SGID          |
 326                                                    IB_SA_PATH_REC_NUMB_PATH     |
 327                                                    IB_SA_PATH_REC_PKEY,
 328                                                    SRP_PATH_REC_TIMEOUT_MS,
 329                                                    GFP_KERNEL,
 330                                                    srp_path_rec_completion,
 331                                                    target, &target->path_query);
 332         if (target->path_query_id < 0)
 333                 return target->path_query_id;
 334
 335         wait_for_completion(&target->done);
 336
 337         if (target->status < 0)
 338                 shost_printk(KERN_WARNING, target->scsi_host,
 339                              PFX "Path record query failed\n");
 340
 341         return target->status;
 342 }
 343
 344 static int srp_send_req(struct srp_target_port *target)
 345 {
 346         struct {
 347                 struct ib_cm_req_param param;
 348                 struct srp_login_req   priv;
 349         } *req = NULL;
 350         int status;
 351
 352         req = kzalloc(sizeof *req, GFP_KERNEL);
 353         if (!req)
 354                 return -ENOMEM;
 355
 356         req->param.primary_path               = &target->path;
 357         req->param.alternate_path             = NULL;
 358         req->param.service_id                 = target->service_id;
 359         req->param.qp_num                     = target->qp->qp_num;
 360         req->param.qp_type                    = target->qp->qp_type;
 361         req->param.private_data               = &req->priv;
 362         req->param.private_data_len           = sizeof req->priv;
 363         req->param.flow_control               = 1;
 364
 365         get_random_bytes(&req->param.starting_psn, 4);
 366         req->param.starting_psn              &= 0xffffff;
 367
 368         /*
 369          * Pick some arbitrary defaults here; we could make these
 370          * module parameters if anyone cared about setting them.
 371          */
 372         req->param.responder_resources        = 4;
 373         req->param.remote_cm_response_timeout = 20;
 374         req->param.local_cm_response_timeout  = 20;
 375         req->param.retry_count                = 7;
 376         req->param.rnr_retry_count            = 7;
 377         req->param.max_cm_retries             = 15;
 378
 379         req->priv.opcode        = SRP_LOGIN_REQ;
 380         req->priv.tag           = 0;
 381         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 382         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 383                                               SRP_BUF_FORMAT_INDIRECT);
 384         /*
 385          * In the published SRP specification (draft rev. 16a), the
 386          * port identifier format is 8 bytes of ID extension followed
 387          * by 8 bytes of GUID.  Older drafts put the two halves in the
 388          * opposite order, so that the GUID comes first.
 389          *
 390          * Targets conforming to these obsolete drafts can be
 391          * recognized by the I/O Class they report.
 392          */
 393         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 394                 memcpy(req->priv.initiator_port_id,
 395                        &target->path.sgid.global.interface_id, 8);
 396                 memcpy(req->priv.initiator_port_id + 8,
 397                        &target->initiator_ext, 8);
 398                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 399                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 400         } else {
 401                 memcpy(req->priv.initiator_port_id,
 402                        &target->initiator_ext, 8);
 403                 memcpy(req->priv.initiator_port_id + 8,
 404                        &target->path.sgid.global.interface_id, 8);
 405                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 406                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 407         }
 408
 409         /*
 410          * Topspin/Cisco SRP targets will reject our login unless we
 411          * zero out the first 8 bytes of our initiator port ID and set
 412          * the second 8 bytes to the local node GUID.
 413          */
 414         if (srp_target_is_topspin(target)) {
 415                 shost_printk(KERN_DEBUG, target->scsi_host,
 416                              PFX "Topspin/Cisco initiator port ID workaround "
 417                              "activated for target GUID %016llx\n",
 418                              (unsigned long long) be64_to_cpu(target->ioc_guid));
 419                 memset(req->priv.initiator_port_id, 0, 8);
 420                 memcpy(req->priv.initiator_port_id + 8,
 421                        &target->srp_host->srp_dev->dev->node_guid, 8);
 422         }
 423
 424         status = ib_send_cm_req(target->cm_id, &req->param);
 425
 426         kfree(req);
 427
 428         return status;
 429 }
 430
 431 static void srp_disconnect_target(struct srp_target_port *target)
 432 {
 433         /* XXX should send SRP_I_LOGOUT request */
 434
 435         init_completion(&target->done);
 436         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 437                 shost_printk(KERN_DEBUG, target->scsi_host,
 438                              PFX "Sending CM DREQ failed\n");
 439                 return;
 440         }
 441         wait_for_completion(&target->done);
 442 }
 443
 444 static void srp_remove_work(struct work_struct *work)
 445 {
 446         struct srp_target_port *target =
 447                 container_of(work, struct srp_target_port, work);
 448
 449         spin_lock_irq(target->scsi_host->host_lock);
 450         if (target->state != SRP_TARGET_DEAD) {
 451                 spin_unlock_irq(target->scsi_host->host_lock);
 452                 return;
 453         }
 454         target->state = SRP_TARGET_REMOVED;
 455         spin_unlock_irq(target->scsi_host->host_lock);
 456
 457         spin_lock(&target->srp_host->target_lock);
 458         list_del(&target->list);
 459         spin_unlock(&target->srp_host->target_lock);
 460
 461         srp_remove_host(target->scsi_host);
 462         scsi_remove_host(target->scsi_host);
 463         ib_destroy_cm_id(target->cm_id);
 464         srp_free_target_ib(target);
 465         scsi_host_put(target->scsi_host);
 466 }
 467
 468 static int srp_connect_target(struct srp_target_port *target)
 469 {
 470         int retries = 3;
 471         int ret;
 472
 473         ret = srp_lookup_path(target);
 474         if (ret)
 475                 return ret;
 476
 477         while (1) {
 478                 init_completion(&target->done);
 479                 ret = srp_send_req(target);
 480                 if (ret)
 481                         return ret;
 482                 wait_for_completion(&target->done);
 483
 484                 /*
 485                  * The CM event handling code will set status to
 486                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 487                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 488                  * redirect REJ back.
 489                  */
 490                 switch (target->status) {
 491                 case 0:
 492                         return 0;
 493
 494                 case SRP_PORT_REDIRECT:
 495                         ret = srp_lookup_path(target);
 496                         if (ret)
 497                                 return ret;
 498                         break;
 499
 500                 case SRP_DLID_REDIRECT:
 501                         break;
 502
 503                 case SRP_STALE_CONN:
 504                         /* Our current CM id was stale, and is now in timewait.
 505                          * Try to reconnect with a new one.
 506                          */
 507                         if (!retries-- || srp_new_cm_id(target)) {
 508                                 shost_printk(KERN_ERR, target->scsi_host, PFX
 509                                              "giving up on stale connection\n");
 510                                 target->status = -ECONNRESET;
 511                                 return target->status;
 512                         }
 513
 514                         shost_printk(KERN_ERR, target->scsi_host, PFX
 515                                      "retrying stale connection\n");
 516                         break;
 517
 518                 default:
 519                         return target->status;
 520                 }
 521         }
 522 }
 523
 524 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 525                            struct srp_target_port *target,
 526                            struct srp_request *req)
 527 {
 528         if (!scsi_sglist(scmnd) ||
 529             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 530              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 531                 return;
 532
 533         if (req->fmr) {
 534                 ib_fmr_pool_unmap(req->fmr);
 535                 req->fmr = NULL;
 536         }
 537
 538         ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
 539                         scsi_sg_count(scmnd), scmnd->sc_data_direction);
 540 }
 541
 542 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 543 {
 544         srp_unmap_data(req->scmnd, target, req);
 545         list_move_tail(&req->list, &target->free_reqs);
 546 }
 547
 548 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 549 {
 550         req->scmnd->result = DID_RESET << 16;
 551         req->scmnd->scsi_done(req->scmnd);
 552         srp_remove_req(target, req);
 553 }
 554
 555 static int srp_reconnect_target(struct srp_target_port *target)
 556 {
 557         struct ib_qp_attr qp_attr;
 558         struct srp_request *req, *tmp;
 559         struct ib_wc wc;
 560         int ret;
 561
 562         spin_lock_irq(target->scsi_host->host_lock);
 563         if (target->state != SRP_TARGET_LIVE) {
 564                 spin_unlock_irq(target->scsi_host->host_lock);
 565                 return -EAGAIN;
 566         }
 567         target->state = SRP_TARGET_CONNECTING;
 568         spin_unlock_irq(target->scsi_host->host_lock);
 569
 570         srp_disconnect_target(target);
 571         /*
 572          * Now get a new local CM ID so that we avoid confusing the
 573          * target in case things are really fouled up.
 574          */
 575         ret = srp_new_cm_id(target);
 576         if (ret)
 577                 goto err;
 578
 579         qp_attr.qp_state = IB_QPS_RESET;
 580         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 581         if (ret)
 582                 goto err;
 583
 584         ret = srp_init_qp(target, target->qp);
 585         if (ret)
 586                 goto err;
 587
 588         while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
 589                 ; /* nothing */
 590         while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
 591                 ; /* nothing */
 592
 593         spin_lock_irq(target->scsi_host->host_lock);
 594         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 595                 srp_reset_req(target, req);
 596         spin_unlock_irq(target->scsi_host->host_lock);
 597
 598         target->rx_head  = 0;
 599         target->tx_head  = 0;
 600         target->tx_tail  = 0;
 601
 602         target->qp_in_error = 0;
 603         ret = srp_connect_target(target);
 604         if (ret)
 605                 goto err;
 606
 607         spin_lock_irq(target->scsi_host->host_lock);
 608         if (target->state == SRP_TARGET_CONNECTING) {
 609                 ret = 0;
 610                 target->state = SRP_TARGET_LIVE;
 611         } else
 612                 ret = -EAGAIN;
 613         spin_unlock_irq(target->scsi_host->host_lock);
 614
 615         return ret;
 616
 617 err:
 618         shost_printk(KERN_ERR, target->scsi_host,
 619                      PFX "reconnect failed (%d), removing target port.\n", ret);
 620
 621         /*
 622          * We couldn't reconnect, so kill our target port off.
 623          * However, we have to defer the real removal because we might
 624          * be in the context of the SCSI error handler now, which
 625          * would deadlock if we call scsi_remove_host().
 626          */
 627         spin_lock_irq(target->scsi_host->host_lock);
 628         if (target->state == SRP_TARGET_CONNECTING) {
 629                 target->state = SRP_TARGET_DEAD;
 630                 INIT_WORK(&target->work, srp_remove_work);
 631                 schedule_work(&target->work);
 632         }
 633         spin_unlock_irq(target->scsi_host->host_lock);
 634
 635         return ret;
 636 }
 637
 638 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 639                        int sg_cnt, struct srp_request *req,
 640                        struct srp_direct_buf *buf)
 641 {
 642         u64 io_addr = 0;
 643         u64 *dma_pages;
 644         u32 len;
 645         int page_cnt;
 646         int i, j;
 647         int ret;
 648         struct srp_device *dev = target->srp_host->srp_dev;
 649         struct ib_device *ibdev = dev->dev;
 650         struct scatterlist *sg;
 651
 652         if (!dev->fmr_pool)
 653                 return -ENODEV;
 654
 655         if (srp_target_is_mellanox(target) &&
 656             (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
 657                 return -EINVAL;
 658
 659         len = page_cnt = 0;
 660         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 661                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 662
 663                 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
 664                         if (i > 0)
 665                                 return -EINVAL;
 666                         else
 667                                 ++page_cnt;
 668                 }
 669                 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
 670                     ~dev->fmr_page_mask) {
 671                         if (i < sg_cnt - 1)
 672                                 return -EINVAL;
 673                         else
 674                                 ++page_cnt;
 675                 }
 676
 677                 len += dma_len;
 678         }
 679
 680         page_cnt += len >> dev->fmr_page_shift;
 681         if (page_cnt > SRP_FMR_SIZE)
 682                 return -ENOMEM;
 683
 684         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 685         if (!dma_pages)
 686                 return -ENOMEM;
 687
 688         page_cnt = 0;
 689         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 690                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 691
 692                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 693                         dma_pages[page_cnt++] =
 694                                 (ib_sg_dma_address(ibdev, sg) &
 695                                  dev->fmr_page_mask) + j;
 696         }
 697
 698         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 699                                         dma_pages, page_cnt, io_addr);
 700         if (IS_ERR(req->fmr)) {
 701                 ret = PTR_ERR(req->fmr);
 702                 req->fmr = NULL;
 703                 goto out;
 704         }
 705
 706         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 707                                ~dev->fmr_page_mask);
 708         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 709         buf->len = cpu_to_be32(len);
 710
 711         ret = 0;
 712
 713 out:
 714         kfree(dma_pages);
 715
 716         return ret;
 717 }
 718
 719 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 720                         struct srp_request *req)
 721 {
 722         struct scatterlist *scat;
 723         struct srp_cmd *cmd = req->cmd->buf;
 724         int len, nents, count;
 725         u8 fmt = SRP_DATA_DESC_DIRECT;
 726         struct srp_device *dev;
 727         struct ib_device *ibdev;
 728
 729         if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
 730                 return sizeof (struct srp_cmd);
 731
 732         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 733             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 734                 shost_printk(KERN_WARNING, target->scsi_host,
 735                              PFX "Unhandled data direction %d\n",
 736                              scmnd->sc_data_direction);
 737                 return -EINVAL;
 738         }
 739
 740         nents = scsi_sg_count(scmnd);
 741         scat  = scsi_sglist(scmnd);
 742
 743         dev = target->srp_host->srp_dev;
 744         ibdev = dev->dev;
 745
 746         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 747
 748         fmt = SRP_DATA_DESC_DIRECT;
 749         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 750
 751         if (count == 1) {
 752                 /*
 753                  * The midlayer only generated a single gather/scatter
 754                  * entry, or DMA mapping coalesced everything to a
 755                  * single entry.  So a direct descriptor along with
 756                  * the DMA MR suffices.
 757                  */
 758                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 759
 760                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 761                 buf->key = cpu_to_be32(dev->mr->rkey);
 762                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 763         } else if (srp_map_fmr(target, scat, count, req,
 764                                (void *) cmd->add_data)) {
 765                 /*
 766                  * FMR mapping failed, and the scatterlist has more
 767                  * than one entry.  Generate an indirect memory
 768                  * descriptor.
 769                  */
 770                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 771                 struct scatterlist *sg;
 772                 u32 datalen = 0;
 773                 int i;
 774
 775                 fmt = SRP_DATA_DESC_INDIRECT;
 776                 len = sizeof (struct srp_cmd) +
 777                         sizeof (struct srp_indirect_buf) +
 778                         count * sizeof (struct srp_direct_buf);
 779
 780                 scsi_for_each_sg(scmnd, sg, count, i) {
 781                         unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 782
 783                         buf->desc_list[i].va  =
 784                                 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
 785                         buf->desc_list[i].key =
 786                                 cpu_to_be32(dev->mr->rkey);
 787                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 788                         datalen += dma_len;
 789                 }
 790
 791                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 792                         cmd->data_out_desc_cnt = count;
 793                 else
 794                         cmd->data_in_desc_cnt = count;
 795
 796                 buf->table_desc.va  =
 797                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 798                 buf->table_desc.key =
 799                         cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
 800                 buf->table_desc.len =
 801                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 802
 803                 buf->len = cpu_to_be32(datalen);
 804         }
 805
 806         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 807                 cmd->buf_fmt = fmt << 4;
 808         else
 809                 cmd->buf_fmt = fmt;
 810
 811         return len;
 812 }
 813
 814 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 815 {
 816         struct srp_request *req;
 817         struct scsi_cmnd *scmnd;
 818         unsigned long flags;
 819         s32 delta;
 820
 821         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 822
 823         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 824
 825         target->req_lim += delta;
 826
 827         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 828
 829         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 830                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 831                         req->tsk_status = -1;
 832                 else
 833                         req->tsk_status = rsp->data[3];
 834                 complete(&req->done);
 835         } else {
 836                 scmnd = req->scmnd;
 837                 if (!scmnd)
 838                         shost_printk(KERN_ERR, target->scsi_host,
 839                                      "Null scmnd for RSP w/tag %016llx\n",
 840                                      (unsigned long long) rsp->tag);
 841                 scmnd->result = rsp->status;
 842
 843                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 844                         memcpy(scmnd->sense_buffer, rsp->data +
 845                                be32_to_cpu(rsp->resp_data_len),
 846                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 847                                      SCSI_SENSE_BUFFERSIZE));
 848                 }
 849
 850                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 851                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 852                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 853                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 854
 855                 if (!req->tsk_mgmt) {
 856                         scmnd->host_scribble = (void *) -1L;
 857                         scmnd->scsi_done(scmnd);
 858
 859                         srp_remove_req(target, req);
 860                 } else
 861                         req->cmd_done = 1;
 862         }
 863
 864         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 865 }
 866
 867 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 868 {
 869         struct ib_device *dev;
 870         struct srp_iu *iu;
 871         u8 opcode;
 872
 873         iu = target->rx_ring[wc->wr_id];
 874
 875         dev = target->srp_host->srp_dev->dev;
 876         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 877                                    DMA_FROM_DEVICE);
 878
 879         opcode = *(u8 *) iu->buf;
 880
 881         if (0) {
 882                 int i;
 883
 884                 shost_printk(KERN_ERR, target->scsi_host,
 885                              PFX "recv completion, opcode 0x%02x\n", opcode);
 886
 887                 for (i = 0; i < wc->byte_len; ++i) {
 888                         if (i % 8 == 0)
 889                                 printk(KERN_ERR "  [%02x] ", i);
 890                         printk(" %02x", ((u8 *) iu->buf)[i]);
 891                         if ((i + 1) % 8 == 0)
 892                                 printk("\n");
 893                 }
 894
 895                 if (wc->byte_len % 8)
 896                         printk("\n");
 897         }
 898
 899         switch (opcode) {
 900         case SRP_RSP:
 901                 srp_process_rsp(target, iu->buf);
 902                 break;
 903
 904         case SRP_T_LOGOUT:
 905                 /* XXX Handle target logout */
 906                 shost_printk(KERN_WARNING, target->scsi_host,
 907                              PFX "Got target logout request\n");
 908                 break;
 909
 910         default:
 911                 shost_printk(KERN_WARNING, target->scsi_host,
 912                              PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 913                 break;
 914         }
 915
 916         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 917                                       DMA_FROM_DEVICE);
 918 }
 919
 920 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
 921 {
 922         struct srp_target_port *target = target_ptr;
 923         struct ib_wc wc;
 924
 925         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 926         while (ib_poll_cq(cq, 1, &wc) > 0) {
 927                 if (wc.status) {
 928                         shost_printk(KERN_ERR, target->scsi_host,
 929                                      PFX "failed receive status %d\n",
 930                                      wc.status);
 931                         target->qp_in_error = 1;
 932                         break;
 933                 }
 934
 935                 srp_handle_recv(target, &wc);
 936         }
 937 }
 938
 939 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
 940 {
 941         struct srp_target_port *target = target_ptr;
 942         struct ib_wc wc;
 943
 944         while (ib_poll_cq(cq, 1, &wc) > 0) {
 945                 if (wc.status) {
 946                         shost_printk(KERN_ERR, target->scsi_host,
 947                                      PFX "failed send status %d\n",
 948                                      wc.status);
 949                         target->qp_in_error = 1;
 950                         break;
 951                 }
 952
 953                 ++target->tx_tail;
 954         }
 955 }
 956
 957 static int __srp_post_recv(struct srp_target_port *target)
 958 {
 959         struct srp_iu *iu;
 960         struct ib_sge list;
 961         struct ib_recv_wr wr, *bad_wr;
 962         unsigned int next;
 963         int ret;
 964
 965         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 966         wr.wr_id = next;
 967         iu       = target->rx_ring[next];
 968
 969         list.addr   = iu->dma;
 970         list.length = iu->size;
 971         list.lkey   = target->srp_host->srp_dev->mr->lkey;
 972
 973         wr.next     = NULL;
 974         wr.sg_list  = &list;
 975         wr.num_sge  = 1;
 976
 977         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 978         if (!ret)
 979                 ++target->rx_head;
 980
 981         return ret;
 982 }
 983
 984 static int srp_post_recv(struct srp_target_port *target)
 985 {
 986         unsigned long flags;
 987         int ret;
 988
 989         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 990         ret = __srp_post_recv(target);
 991         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 992
 993         return ret;
 994 }
 995
 996 /*
 997  * Must be called with target->scsi_host->host_lock held to protect
 998  * req_lim and tx_head.  Lock cannot be dropped between call here and
 999  * call to __srp_post_send().
1000  */
1001 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1002                                         enum srp_request_type req_type)
1003 {
1004         s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
1005
1006         srp_send_completion(target->send_cq, target);
1007
1008         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
1009                 return NULL;
1010
1011         if (target->req_lim < min) {
1012                 ++target->zero_req_lim;
1013                 return NULL;
1014         }
1015
1016         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
1017 }
1018
1019 /*
1020  * Must be called with target->scsi_host->host_lock held to protect
1021  * req_lim and tx_head.
1022  */
1023 static int __srp_post_send(struct srp_target_port *target,
1024                            struct srp_iu *iu, int len)
1025 {
1026         struct ib_sge list;
1027         struct ib_send_wr wr, *bad_wr;
1028         int ret = 0;
1029
1030         list.addr   = iu->dma;
1031         list.length = len;
1032         list.lkey   = target->srp_host->srp_dev->mr->lkey;
1033
1034         wr.next       = NULL;
1035         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
1036         wr.sg_list    = &list;
1037         wr.num_sge    = 1;
1038         wr.opcode     = IB_WR_SEND;
1039         wr.send_flags = IB_SEND_SIGNALED;
1040
1041         ret = ib_post_send(target->qp, &wr, &bad_wr);
1042
1043         if (!ret) {
1044                 ++target->tx_head;
1045                 --target->req_lim;
1046         }
1047
1048         return ret;
1049 }
1050
1051 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1052                             void (*done)(struct scsi_cmnd *))
1053 {
1054         struct srp_target_port *target = host_to_target(scmnd->device->host);
1055         struct srp_request *req;
1056         struct srp_iu *iu;
1057         struct srp_cmd *cmd;
1058         struct ib_device *dev;
1059         int len;
1060
1061         if (target->state == SRP_TARGET_CONNECTING)
1062                 goto err;
1063
1064         if (target->state == SRP_TARGET_DEAD ||
1065             target->state == SRP_TARGET_REMOVED) {
1066                 scmnd->result = DID_BAD_TARGET << 16;
1067                 done(scmnd);
1068                 return 0;
1069         }
1070
1071         iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1072         if (!iu)
1073                 goto err;
1074
1075         dev = target->srp_host->srp_dev->dev;
1076         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1077                                    DMA_TO_DEVICE);
1078
1079         req = list_entry(target->free_reqs.next, struct srp_request, list);
1080
1081         scmnd->scsi_done     = done;
1082         scmnd->result        = 0;
1083         scmnd->host_scribble = (void *) (long) req->index;
1084
1085         cmd = iu->buf;
1086         memset(cmd, 0, sizeof *cmd);
1087
1088         cmd->opcode = SRP_CMD;
1089         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1090         cmd->tag    = req->index;
1091         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1092
1093         req->scmnd    = scmnd;
1094         req->cmd      = iu;
1095         req->cmd_done = 0;
1096         req->tsk_mgmt = NULL;
1097
1098         len = srp_map_data(scmnd, target, req);
1099         if (len < 0) {
1100                 shost_printk(KERN_ERR, target->scsi_host,
1101                              PFX "Failed to map data\n");
1102                 goto err;
1103         }
1104
1105         if (__srp_post_recv(target)) {
1106                 shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1107                 goto err_unmap;
1108         }
1109
1110         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1111                                       DMA_TO_DEVICE);
1112
1113         if (__srp_post_send(target, iu, len)) {
1114                 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1115                 goto err_unmap;
1116         }
1117
1118         list_move_tail(&req->list, &target->req_queue);
1119
1120         return 0;
1121
1122 err_unmap:
1123         srp_unmap_data(scmnd, target, req);
1124
1125 err:
1126         return SCSI_MLQUEUE_HOST_BUSY;
1127 }
1128
1129 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1130 {
1131         int i;
1132
1133         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1134                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1135                                                   target->max_ti_iu_len,
1136                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1137                 if (!target->rx_ring[i])
1138                         goto err;
1139         }
1140
1141         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1142                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1143                                                   srp_max_iu_len,
1144                                                   GFP_KERNEL, DMA_TO_DEVICE);
1145                 if (!target->tx_ring[i])
1146                         goto err;
1147         }
1148
1149         return 0;
1150
1151 err:
1152         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1153                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1154                 target->rx_ring[i] = NULL;
1155         }
1156
1157         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1158                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1159                 target->tx_ring[i] = NULL;
1160         }
1161
1162         return -ENOMEM;
1163 }
1164
1165 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1166                                struct ib_cm_event *event,
1167                                struct srp_target_port *target)
1168 {
1169         struct Scsi_Host *shost = target->scsi_host;
1170         struct ib_class_port_info *cpi;
1171         int opcode;
1172
1173         switch (event->param.rej_rcvd.reason) {
1174         case IB_CM_REJ_PORT_CM_REDIRECT:
1175                 cpi = event->param.rej_rcvd.ari;
1176                 target->path.dlid = cpi->redirect_lid;
1177                 target->path.pkey = cpi->redirect_pkey;
1178                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1179                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1180
1181                 target->status = target->path.dlid ?
1182                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1183                 break;
1184
1185         case IB_CM_REJ_PORT_REDIRECT:
1186                 if (srp_target_is_topspin(target)) {
1187                         /*
1188                          * Topspin/Cisco SRP gateways incorrectly send
1189                          * reject reason code 25 when they mean 24
1190                          * (port redirect).
1191                          */
1192                         memcpy(target->path.dgid.raw,
1193                                event->param.rej_rcvd.ari, 16);
1194
1195                         shost_printk(KERN_DEBUG, shost,
1196                                      PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1197                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1198                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1199
1200                         target->status = SRP_PORT_REDIRECT;
1201                 } else {
1202                         shost_printk(KERN_WARNING, shost,
1203                                      "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1204                         target->status = -ECONNRESET;
1205                 }
1206                 break;
1207
1208         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1209                 shost_printk(KERN_WARNING, shost,
1210                             "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1211                 target->status = -ECONNRESET;
1212                 break;
1213
1214         case IB_CM_REJ_CONSUMER_DEFINED:
1215                 opcode = *(u8 *) event->private_data;
1216                 if (opcode == SRP_LOGIN_REJ) {
1217                         struct srp_login_rej *rej = event->private_data;
1218                         u32 reason = be32_to_cpu(rej->reason);
1219
1220                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1221                                 shost_printk(KERN_WARNING, shost,
1222                                              PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1223                         else
1224                                 shost_printk(KERN_WARNING, shost,
1225                                             PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1226                 } else
1227                         shost_printk(KERN_WARNING, shost,
1228                                      "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1229                                      " opcode 0x%02x\n", opcode);
1230                 target->status = -ECONNRESET;
1231                 break;
1232
1233         case IB_CM_REJ_STALE_CONN:
1234                 shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
1235                 target->status = SRP_STALE_CONN;
1236                 break;
1237
1238         default:
1239                 shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
1240                              event->param.rej_rcvd.reason);
1241                 target->status = -ECONNRESET;
1242         }
1243 }
1244
1245 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1246 {
1247         struct srp_target_port *target = cm_id->context;
1248         struct ib_qp_attr *qp_attr = NULL;
1249         int attr_mask = 0;
1250         int comp = 0;
1251         int opcode = 0;
1252
1253         switch (event->event) {
1254         case IB_CM_REQ_ERROR:
1255                 shost_printk(KERN_DEBUG, target->scsi_host,
1256                              PFX "Sending CM REQ failed\n");
1257                 comp = 1;
1258                 target->status = -ECONNRESET;
1259                 break;
1260
1261         case IB_CM_REP_RECEIVED:
1262                 comp = 1;
1263                 opcode = *(u8 *) event->private_data;
1264
1265                 if (opcode == SRP_LOGIN_RSP) {
1266                         struct srp_login_rsp *rsp = event->private_data;
1267
1268                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1269                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1270
1271                         target->scsi_host->can_queue = min(target->req_lim,
1272                                                            target->scsi_host->can_queue);
1273                 } else {
1274                         shost_printk(KERN_WARNING, target->scsi_host,
1275                                     PFX "Unhandled RSP opcode %#x\n", opcode);
1276                         target->status = -ECONNRESET;
1277                         break;
1278                 }
1279
1280                 if (!target->rx_ring[0]) {
1281                         target->status = srp_alloc_iu_bufs(target);
1282                         if (target->status)
1283                                 break;
1284                 }
1285
1286                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1287                 if (!qp_attr) {
1288                         target->status = -ENOMEM;
1289                         break;
1290                 }
1291
1292                 qp_attr->qp_state = IB_QPS_RTR;
1293                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1294                 if (target->status)
1295                         break;
1296
1297                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1298                 if (target->status)
1299                         break;
1300
1301                 target->status = srp_post_recv(target);
1302                 if (target->status)
1303                         break;
1304
1305                 qp_attr->qp_state = IB_QPS_RTS;
1306                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1307                 if (target->status)
1308                         break;
1309
1310                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1311                 if (target->status)
1312                         break;
1313
1314                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1315                 if (target->status)
1316                         break;
1317
1318                 break;
1319
1320         case IB_CM_REJ_RECEIVED:
1321                 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1322                 comp = 1;
1323
1324                 srp_cm_rej_handler(cm_id, event, target);
1325                 break;
1326
1327         case IB_CM_DREQ_RECEIVED:
1328                 shost_printk(KERN_WARNING, target->scsi_host,
1329                              PFX "DREQ received - connection closed\n");
1330                 if (ib_send_cm_drep(cm_id, NULL, 0))
1331                         shost_printk(KERN_ERR, target->scsi_host,
1332                                      PFX "Sending CM DREP failed\n");
1333                 break;
1334
1335         case IB_CM_TIMEWAIT_EXIT:
1336                 shost_printk(KERN_ERR, target->scsi_host,
1337                              PFX "connection closed\n");
1338
1339                 comp = 1;
1340                 target->status = 0;
1341                 break;
1342
1343         case IB_CM_MRA_RECEIVED:
1344         case IB_CM_DREQ_ERROR:
1345         case IB_CM_DREP_RECEIVED:
1346                 break;
1347
1348         default:
1349                 shost_printk(KERN_WARNING, target->scsi_host,
1350                              PFX "Unhandled CM event %d\n", event->event);
1351                 break;
1352         }
1353
1354         if (comp)
1355                 complete(&target->done);
1356
1357         kfree(qp_attr);
1358
1359         return 0;
1360 }
1361
1362 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1363                              struct srp_request *req, u8 func)
1364 {
1365         struct srp_iu *iu;
1366         struct srp_tsk_mgmt *tsk_mgmt;
1367
1368         spin_lock_irq(target->scsi_host->host_lock);
1369
1370         if (target->state == SRP_TARGET_DEAD ||
1371             target->state == SRP_TARGET_REMOVED) {
1372                 req->scmnd->result = DID_BAD_TARGET << 16;
1373                 goto out;
1374         }
1375
1376         init_completion(&req->done);
1377
1378         iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1379         if (!iu)
1380                 goto out;
1381
1382         tsk_mgmt = iu->buf;
1383         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1384
1385         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1386         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1387         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1388         tsk_mgmt->tsk_mgmt_func = func;
1389         tsk_mgmt->task_tag      = req->index;
1390
1391         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1392                 goto out;
1393
1394         req->tsk_mgmt = iu;
1395
1396         spin_unlock_irq(target->scsi_host->host_lock);
1397
1398         if (!wait_for_completion_timeout(&req->done,
1399                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1400                 return -1;
1401
1402         return 0;
1403
1404 out:
1405         spin_unlock_irq(target->scsi_host->host_lock);
1406         return -1;
1407 }
1408
1409 static int srp_find_req(struct srp_target_port *target,
1410                         struct scsi_cmnd *scmnd,
1411                         struct srp_request **req)
1412 {
1413         if (scmnd->host_scribble == (void *) -1L)
1414                 return -1;
1415
1416         *req = &target->req_ring[(long) scmnd->host_scribble];
1417
1418         return 0;
1419 }
1420
1421 static int srp_abort(struct scsi_cmnd *scmnd)
1422 {
1423         struct srp_target_port *target = host_to_target(scmnd->device->host);
1424         struct srp_request *req;
1425         int ret = SUCCESS;
1426
1427         shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1428
1429         if (target->qp_in_error)
1430                 return FAILED;
1431         if (srp_find_req(target, scmnd, &req))
1432                 return FAILED;
1433         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1434                 return FAILED;
1435
1436         spin_lock_irq(target->scsi_host->host_lock);
1437
1438         if (req->cmd_done) {
1439                 srp_remove_req(target, req);
1440                 scmnd->scsi_done(scmnd);
1441         } else if (!req->tsk_status) {
1442                 srp_remove_req(target, req);
1443                 scmnd->result = DID_ABORT << 16;
1444         } else
1445                 ret = FAILED;
1446
1447         spin_unlock_irq(target->scsi_host->host_lock);
1448
1449         return ret;
1450 }
1451
1452 static int srp_reset_device(struct scsi_cmnd *scmnd)
1453 {
1454         struct srp_target_port *target = host_to_target(scmnd->device->host);
1455         struct srp_request *req, *tmp;
1456
1457         shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1458
1459         if (target->qp_in_error)
1460                 return FAILED;
1461         if (srp_find_req(target, scmnd, &req))
1462                 return FAILED;
1463         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1464                 return FAILED;
1465         if (req->tsk_status)
1466                 return FAILED;
1467
1468         spin_lock_irq(target->scsi_host->host_lock);
1469
1470         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1471                 if (req->scmnd->device == scmnd->device)
1472                         srp_reset_req(target, req);
1473
1474         spin_unlock_irq(target->scsi_host->host_lock);
1475
1476         return SUCCESS;
1477 }
1478
1479 static int srp_reset_host(struct scsi_cmnd *scmnd)
1480 {
1481         struct srp_target_port *target = host_to_target(scmnd->device->host);
1482         int ret = FAILED;
1483
1484         shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1485
1486         if (!srp_reconnect_target(target))
1487                 ret = SUCCESS;
1488
1489         return ret;
1490 }
1491
1492 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1493                            char *buf)
1494 {
1495         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1496
1497         if (target->state == SRP_TARGET_DEAD ||
1498             target->state == SRP_TARGET_REMOVED)
1499                 return -ENODEV;
1500
1501         return sprintf(buf, "0x%016llx\n",
1502                        (unsigned long long) be64_to_cpu(target->id_ext));
1503 }
1504
1505 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1506                              char *buf)
1507 {
1508         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1509
1510         if (target->state == SRP_TARGET_DEAD ||
1511             target->state == SRP_TARGET_REMOVED)
1512                 return -ENODEV;
1513
1514         return sprintf(buf, "0x%016llx\n",
1515                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1516 }
1517
1518 static ssize_t show_service_id(struct device *dev,
1519                                struct device_attribute *attr, char *buf)
1520 {
1521         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1522
1523         if (target->state == SRP_TARGET_DEAD ||
1524             target->state == SRP_TARGET_REMOVED)
1525                 return -ENODEV;
1526
1527         return sprintf(buf, "0x%016llx\n",
1528                        (unsigned long long) be64_to_cpu(target->service_id));
1529 }
1530
1531 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1532                          char *buf)
1533 {
1534         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1535
1536         if (target->state == SRP_TARGET_DEAD ||
1537             target->state == SRP_TARGET_REMOVED)
1538                 return -ENODEV;
1539
1540         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1541 }
1542
1543 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1544                          char *buf)
1545 {
1546         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1547
1548         if (target->state == SRP_TARGET_DEAD ||
1549             target->state == SRP_TARGET_REMOVED)
1550                 return -ENODEV;
1551
1552         return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1553 }
1554
1555 static ssize_t show_orig_dgid(struct device *dev,
1556                               struct device_attribute *attr, char *buf)
1557 {
1558         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1559
1560         if (target->state == SRP_TARGET_DEAD ||
1561             target->state == SRP_TARGET_REMOVED)
1562                 return -ENODEV;
1563
1564         return sprintf(buf, "%pI6\n", target->orig_dgid);
1565 }
1566
1567 static ssize_t show_zero_req_lim(struct device *dev,
1568                                  struct device_attribute *attr, char *buf)
1569 {
1570         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1571
1572         if (target->state == SRP_TARGET_DEAD ||
1573             target->state == SRP_TARGET_REMOVED)
1574                 return -ENODEV;
1575
1576         return sprintf(buf, "%d\n", target->zero_req_lim);
1577 }
1578
1579 static ssize_t show_local_ib_port(struct device *dev,
1580                                   struct device_attribute *attr, char *buf)
1581 {
1582         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1583
1584         return sprintf(buf, "%d\n", target->srp_host->port);
1585 }
1586
1587 static ssize_t show_local_ib_device(struct device *dev,
1588                                     struct device_attribute *attr, char *buf)
1589 {
1590         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1591
1592         return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1593 }
1594
1595 static DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1596 static DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1597 static DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1598 static DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1599 static DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1600 static DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
1601 static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1602 static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1603 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1604
1605 static struct device_attribute *srp_host_attrs[] = {
1606         &dev_attr_id_ext,
1607         &dev_attr_ioc_guid,
1608         &dev_attr_service_id,
1609         &dev_attr_pkey,
1610         &dev_attr_dgid,
1611         &dev_attr_orig_dgid,
1612         &dev_attr_zero_req_lim,
1613         &dev_attr_local_ib_port,
1614         &dev_attr_local_ib_device,
1615         NULL
1616 };
1617
1618 static struct scsi_host_template srp_template = {
1619         .module                         = THIS_MODULE,
1620         .name                           = "InfiniBand SRP initiator",
1621         .proc_name                      = DRV_NAME,
1622         .info                           = srp_target_info,
1623         .queuecommand                   = srp_queuecommand,
1624         .eh_abort_handler               = srp_abort,
1625         .eh_device_reset_handler        = srp_reset_device,
1626         .eh_host_reset_handler          = srp_reset_host,
1627         .can_queue                      = SRP_SQ_SIZE,
1628         .this_id                        = -1,
1629         .cmd_per_lun                    = SRP_SQ_SIZE,
1630         .use_clustering                 = ENABLE_CLUSTERING,
1631         .shost_attrs                    = srp_host_attrs
1632 };
1633
1634 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1635 {
1636         struct srp_rport_identifiers ids;
1637         struct srp_rport *rport;
1638
1639         sprintf(target->target_name, "SRP.T10:%016llX",
1640                  (unsigned long long) be64_to_cpu(target->id_ext));
1641
1642         if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1643                 return -ENODEV;
1644
1645         memcpy(ids.port_id, &target->id_ext, 8);
1646         memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1647         ids.roles = SRP_RPORT_ROLE_TARGET;
1648         rport = srp_rport_add(target->scsi_host, &ids);
1649         if (IS_ERR(rport)) {
1650                 scsi_remove_host(target->scsi_host);
1651                 return PTR_ERR(rport);
1652         }
1653
1654         spin_lock(&host->target_lock);
1655         list_add_tail(&target->list, &host->target_list);
1656         spin_unlock(&host->target_lock);
1657
1658         target->state = SRP_TARGET_LIVE;
1659
1660         scsi_scan_target(&target->scsi_host->shost_gendev,
1661                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1662
1663         return 0;
1664 }
1665
1666 static void srp_release_dev(struct device *dev)
1667 {
1668         struct srp_host *host =
1669                 container_of(dev, struct srp_host, dev);
1670
1671         complete(&host->released);
1672 }
1673
1674 static struct class srp_class = {
1675         .name    = "infiniband_srp",
1676         .dev_release = srp_release_dev
1677 };
1678
1679 /*
1680  * Target ports are added by writing
1681  *
1682  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1683  *     pkey=<P_Key>,service_id=<service ID>
1684  *
1685  * to the add_target sysfs attribute.
1686  */
1687 enum {
1688         SRP_OPT_ERR             = 0,
1689         SRP_OPT_ID_EXT          = 1 << 0,
1690         SRP_OPT_IOC_GUID        = 1 << 1,
1691         SRP_OPT_DGID            = 1 << 2,
1692         SRP_OPT_PKEY            = 1 << 3,
1693         SRP_OPT_SERVICE_ID      = 1 << 4,
1694         SRP_OPT_MAX_SECT        = 1 << 5,
1695         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1696         SRP_OPT_IO_CLASS        = 1 << 7,
1697         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1698         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1699                                    SRP_OPT_IOC_GUID     |
1700                                    SRP_OPT_DGID         |
1701                                    SRP_OPT_PKEY         |
1702                                    SRP_OPT_SERVICE_ID),
1703 };
1704
1705 static const match_table_t srp_opt_tokens = {
1706         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1707         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1708         { SRP_OPT_DGID,                 "dgid=%s"               },
1709         { SRP_OPT_PKEY,                 "pkey=%x"               },
1710         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1711         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1712         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1713         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1714         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1715         { SRP_OPT_ERR,                  NULL                    }
1716 };
1717
1718 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1719 {
1720         char *options, *sep_opt;
1721         char *p;
1722         char dgid[3];
1723         substring_t args[MAX_OPT_ARGS];
1724         int opt_mask = 0;
1725         int token;
1726         int ret = -EINVAL;
1727         int i;
1728
1729         options = kstrdup(buf, GFP_KERNEL);
1730         if (!options)
1731                 return -ENOMEM;
1732
1733         sep_opt = options;
1734         while ((p = strsep(&sep_opt, ",")) != NULL) {
1735                 if (!*p)
1736                         continue;
1737
1738                 token = match_token(p, srp_opt_tokens, args);
1739                 opt_mask |= token;
1740
1741                 switch (token) {
1742                 case SRP_OPT_ID_EXT:
1743                         p = match_strdup(args);
1744                         if (!p) {
1745                                 ret = -ENOMEM;
1746                                 goto out;
1747                         }
1748                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1749                         kfree(p);
1750                         break;
1751
1752                 case SRP_OPT_IOC_GUID:
1753                         p = match_strdup(args);
1754                         if (!p) {
1755                                 ret = -ENOMEM;
1756                                 goto out;
1757                         }
1758                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1759                         kfree(p);
1760                         break;
1761
1762                 case SRP_OPT_DGID:
1763                         p = match_strdup(args);
1764                         if (!p) {
1765                                 ret = -ENOMEM;
1766                                 goto out;
1767                         }
1768                         if (strlen(p) != 32) {
1769                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1770                                 kfree(p);
1771                                 goto out;
1772                         }
1773
1774                         for (i = 0; i < 16; ++i) {
1775                                 strlcpy(dgid, p + i * 2, 3);
1776                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1777                         }
1778                         kfree(p);
1779                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1780                         break;
1781
1782                 case SRP_OPT_PKEY:
1783                         if (match_hex(args, &token)) {
1784                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1785                                 goto out;
1786                         }
1787                         target->path.pkey = cpu_to_be16(token);
1788                         break;
1789
1790                 case SRP_OPT_SERVICE_ID:
1791                         p = match_strdup(args);
1792                         if (!p) {
1793                                 ret = -ENOMEM;
1794                                 goto out;
1795                         }
1796                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1797                         target->path.service_id = target->service_id;
1798                         kfree(p);
1799                         break;
1800
1801                 case SRP_OPT_MAX_SECT:
1802                         if (match_int(args, &token)) {
1803                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1804                                 goto out;
1805                         }
1806                         target->scsi_host->max_sectors = token;
1807                         break;
1808
1809                 case SRP_OPT_MAX_CMD_PER_LUN:
1810                         if (match_int(args, &token)) {
1811                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1812                                 goto out;
1813                         }
1814                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1815                         break;
1816
1817                 case SRP_OPT_IO_CLASS:
1818                         if (match_hex(args, &token)) {
1819                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1820                                 goto out;
1821                         }
1822                         if (token != SRP_REV10_IB_IO_CLASS &&
1823                             token != SRP_REV16A_IB_IO_CLASS) {
1824                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1825                                        " %x specified (use %x or %x).\n",
1826                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1827                                 goto out;
1828                         }
1829                         target->io_class = token;
1830                         break;
1831
1832                 case SRP_OPT_INITIATOR_EXT:
1833                         p = match_strdup(args);
1834                         if (!p) {
1835                                 ret = -ENOMEM;
1836                                 goto out;
1837                         }
1838                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1839                         kfree(p);
1840                         break;
1841
1842                 default:
1843                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1844                                "'%s' in target creation request\n", p);
1845                         goto out;
1846                 }
1847         }
1848
1849         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1850                 ret = 0;
1851         else
1852                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1853                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1854                             !(srp_opt_tokens[i].token & opt_mask))
1855                                 printk(KERN_WARNING PFX "target creation request is "
1856                                        "missing parameter '%s'\n",
1857                                        srp_opt_tokens[i].pattern);
1858
1859 out:
1860         kfree(options);
1861         return ret;
1862 }
1863
1864 static ssize_t srp_create_target(struct device *dev,
1865                                  struct device_attribute *attr,
1866                                  const char *buf, size_t count)
1867 {
1868         struct srp_host *host =
1869                 container_of(dev, struct srp_host, dev);
1870         struct Scsi_Host *target_host;
1871         struct srp_target_port *target;
1872         int ret;
1873         int i;
1874
1875         target_host = scsi_host_alloc(&srp_template,
1876                                       sizeof (struct srp_target_port));
1877         if (!target_host)
1878                 return -ENOMEM;
1879
1880         target_host->transportt = ib_srp_transport_template;
1881         target_host->max_lun     = SRP_MAX_LUN;
1882         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1883
1884         target = host_to_target(target_host);
1885
1886         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1887         target->scsi_host  = target_host;
1888         target->srp_host   = host;
1889
1890         INIT_LIST_HEAD(&target->free_reqs);
1891         INIT_LIST_HEAD(&target->req_queue);
1892         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1893                 target->req_ring[i].index = i;
1894                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1895         }
1896
1897         ret = srp_parse_options(buf, target);
1898         if (ret)
1899                 goto err;
1900
1901         ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1902
1903         shost_printk(KERN_DEBUG, target->scsi_host, PFX
1904                      "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1905                      "service_id %016llx dgid %pI6\n",
1906                (unsigned long long) be64_to_cpu(target->id_ext),
1907                (unsigned long long) be64_to_cpu(target->ioc_guid),
1908                be16_to_cpu(target->path.pkey),
1909                (unsigned long long) be64_to_cpu(target->service_id),
1910                target->path.dgid.raw);
1911
1912         ret = srp_create_target_ib(target);
1913         if (ret)
1914                 goto err;
1915
1916         ret = srp_new_cm_id(target);
1917         if (ret)
1918                 goto err_free;
1919
1920         target->qp_in_error = 0;
1921         ret = srp_connect_target(target);
1922         if (ret) {
1923                 shost_printk(KERN_ERR, target->scsi_host,
1924                              PFX "Connection failed\n");
1925                 goto err_cm_id;
1926         }
1927
1928         ret = srp_add_target(host, target);
1929         if (ret)
1930                 goto err_disconnect;
1931
1932         return count;
1933
1934 err_disconnect:
1935         srp_disconnect_target(target);
1936
1937 err_cm_id:
1938         ib_destroy_cm_id(target->cm_id);
1939
1940 err_free:
1941         srp_free_target_ib(target);
1942
1943 err:
1944         scsi_host_put(target_host);
1945
1946         return ret;
1947 }
1948
1949 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1950
1951 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1952                           char *buf)
1953 {
1954         struct srp_host *host = container_of(dev, struct srp_host, dev);
1955
1956         return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1957 }
1958
1959 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1960
1961 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1962                          char *buf)
1963 {
1964         struct srp_host *host = container_of(dev, struct srp_host, dev);
1965
1966         return sprintf(buf, "%d\n", host->port);
1967 }
1968
1969 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1970
1971 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1972 {
1973         struct srp_host *host;
1974
1975         host = kzalloc(sizeof *host, GFP_KERNEL);
1976         if (!host)
1977                 return NULL;
1978
1979         INIT_LIST_HEAD(&host->target_list);
1980         spin_lock_init(&host->target_lock);
1981         init_completion(&host->released);
1982         host->srp_dev = device;
1983         host->port = port;
1984
1985         host->dev.class = &srp_class;
1986         host->dev.parent = device->dev->dma_device;
1987         dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
1988
1989         if (device_register(&host->dev))
1990                 goto free_host;
1991         if (device_create_file(&host->dev, &dev_attr_add_target))
1992                 goto err_class;
1993         if (device_create_file(&host->dev, &dev_attr_ibdev))
1994                 goto err_class;
1995         if (device_create_file(&host->dev, &dev_attr_port))
1996                 goto err_class;
1997
1998         return host;
1999
2000 err_class:
2001         device_unregister(&host->dev);
2002
2003 free_host:
2004         kfree(host);
2005
2006         return NULL;
2007 }
2008
2009 static void srp_add_one(struct ib_device *device)
2010 {
2011         struct srp_device *srp_dev;
2012         struct ib_device_attr *dev_attr;
2013         struct ib_fmr_pool_param fmr_param;
2014         struct srp_host *host;
2015         int s, e, p;
2016
2017         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2018         if (!dev_attr)
2019                 return;
2020
2021         if (ib_query_device(device, dev_attr)) {
2022                 printk(KERN_WARNING PFX "Query device failed for %s\n",
2023                        device->name);
2024                 goto free_attr;
2025         }
2026
2027         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2028         if (!srp_dev)
2029                 goto free_attr;
2030
2031         /*
2032          * Use the smallest page size supported by the HCA, down to a
2033          * minimum of 512 bytes (which is the smallest sector that a
2034          * SCSI command will ever carry).
2035          */
2036         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2037         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
2038         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2039
2040         INIT_LIST_HEAD(&srp_dev->dev_list);
2041
2042         srp_dev->dev = device;
2043         srp_dev->pd  = ib_alloc_pd(device);
2044         if (IS_ERR(srp_dev->pd))
2045                 goto free_dev;
2046
2047         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2048                                     IB_ACCESS_LOCAL_WRITE |
2049                                     IB_ACCESS_REMOTE_READ |
2050                                     IB_ACCESS_REMOTE_WRITE);
2051         if (IS_ERR(srp_dev->mr))
2052                 goto err_pd;
2053
2054         memset(&fmr_param, 0, sizeof fmr_param);
2055         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
2056         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
2057         fmr_param.cache             = 1;
2058         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2059         fmr_param.page_shift        = srp_dev->fmr_page_shift;
2060         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
2061                                        IB_ACCESS_REMOTE_WRITE |
2062                                        IB_ACCESS_REMOTE_READ);
2063
2064         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2065         if (IS_ERR(srp_dev->fmr_pool))
2066                 srp_dev->fmr_pool = NULL;
2067
2068         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2069                 s = 0;
2070                 e = 0;
2071         } else {
2072                 s = 1;
2073                 e = device->phys_port_cnt;
2074         }
2075
2076         for (p = s; p <= e; ++p) {
2077                 host = srp_add_port(srp_dev, p);
2078                 if (host)
2079                         list_add_tail(&host->list, &srp_dev->dev_list);
2080         }
2081
2082         ib_set_client_data(device, &srp_client, srp_dev);
2083
2084         goto free_attr;
2085
2086 err_pd:
2087         ib_dealloc_pd(srp_dev->pd);
2088
2089 free_dev:
2090         kfree(srp_dev);
2091
2092 free_attr:
2093         kfree(dev_attr);
2094 }
2095
2096 static void srp_remove_one(struct ib_device *device)
2097 {
2098         struct srp_device *srp_dev;
2099         struct srp_host *host, *tmp_host;
2100         LIST_HEAD(target_list);
2101         struct srp_target_port *target, *tmp_target;
2102
2103         srp_dev = ib_get_client_data(device, &srp_client);
2104
2105         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2106                 device_unregister(&host->dev);
2107                 /*
2108                  * Wait for the sysfs entry to go away, so that no new
2109                  * target ports can be created.
2110                  */
2111                 wait_for_completion(&host->released);
2112
2113                 /*
2114                  * Mark all target ports as removed, so we stop queueing
2115                  * commands and don't try to reconnect.
2116                  */
2117                 spin_lock(&host->target_lock);
2118                 list_for_each_entry(target, &host->target_list, list) {
2119                         spin_lock_irq(target->scsi_host->host_lock);
2120                         target->state = SRP_TARGET_REMOVED;
2121                         spin_unlock_irq(target->scsi_host->host_lock);
2122                 }
2123                 spin_unlock(&host->target_lock);
2124
2125                 /*
2126                  * Wait for any reconnection tasks that may have
2127                  * started before we marked our target ports as
2128                  * removed, and any target port removal tasks.
2129                  */
2130                 flush_scheduled_work();
2131
2132                 list_for_each_entry_safe(target, tmp_target,
2133                                          &host->target_list, list) {
2134                         srp_remove_host(target->scsi_host);
2135                         scsi_remove_host(target->scsi_host);
2136                         srp_disconnect_target(target);
2137                         ib_destroy_cm_id(target->cm_id);
2138                         srp_free_target_ib(target);
2139                         scsi_host_put(target->scsi_host);
2140                 }
2141
2142                 kfree(host);
2143         }
2144
2145         if (srp_dev->fmr_pool)
2146                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2147         ib_dereg_mr(srp_dev->mr);
2148         ib_dealloc_pd(srp_dev->pd);
2149
2150         kfree(srp_dev);
2151 }
2152
2153 static struct srp_function_template ib_srp_transport_functions = {
2154 };
2155
2156 static int __init srp_init_module(void)
2157 {
2158         int ret;
2159
2160         if (srp_sg_tablesize > 255) {
2161                 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2162                 srp_sg_tablesize = 255;
2163         }
2164
2165         ib_srp_transport_template =
2166                 srp_attach_transport(&ib_srp_transport_functions);
2167         if (!ib_srp_transport_template)
2168                 return -ENOMEM;
2169
2170         srp_template.sg_tablesize = srp_sg_tablesize;
2171         srp_max_iu_len = (sizeof (struct srp_cmd) +
2172                           sizeof (struct srp_indirect_buf) +
2173                           srp_sg_tablesize * 16);
2174
2175         ret = class_register(&srp_class);
2176         if (ret) {
2177                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2178                 srp_release_transport(ib_srp_transport_template);
2179                 return ret;
2180         }
2181
2182         ib_sa_register_client(&srp_sa_client);
2183
2184         ret = ib_register_client(&srp_client);
2185         if (ret) {
2186                 printk(KERN_ERR PFX "couldn't register IB client\n");
2187                 srp_release_transport(ib_srp_transport_template);
2188                 ib_sa_unregister_client(&srp_sa_client);
2189                 class_unregister(&srp_class);
2190                 return ret;
2191         }
2192
2193         return 0;
2194 }
2195
2196 static void __exit srp_cleanup_module(void)
2197 {
2198         ib_unregister_client(&srp_client);
2199         ib_sa_unregister_client(&srp_sa_client);
2200         class_unregister(&srp_class);
2201         srp_release_transport(ib_srp_transport_template);
2202 }
2203
2204 module_init(srp_init_module);
2205 module_exit(srp_cleanup_module);