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 int srp_post_recv(struct srp_target_port *target)
 815 {
 816         unsigned long flags;
 817         struct srp_iu *iu;
 818         struct ib_sge list;
 819         struct ib_recv_wr wr, *bad_wr;
 820         unsigned int next;
 821         int ret;
 822
 823         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 824
 825         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 826         wr.wr_id = next;
 827         iu       = target->rx_ring[next];
 828
 829         list.addr   = iu->dma;
 830         list.length = iu->size;
 831         list.lkey   = target->srp_host->srp_dev->mr->lkey;
 832
 833         wr.next     = NULL;
 834         wr.sg_list  = &list;
 835         wr.num_sge  = 1;
 836
 837         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 838         if (!ret)
 839                 ++target->rx_head;
 840
 841         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 842
 843         return ret;
 844 }
 845
 846 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 847 {
 848         struct srp_request *req;
 849         struct scsi_cmnd *scmnd;
 850         unsigned long flags;
 851         s32 delta;
 852
 853         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 854
 855         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 856
 857         target->req_lim += delta;
 858
 859         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 860
 861         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 862                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 863                         req->tsk_status = -1;
 864                 else
 865                         req->tsk_status = rsp->data[3];
 866                 complete(&req->done);
 867         } else {
 868                 scmnd = req->scmnd;
 869                 if (!scmnd)
 870                         shost_printk(KERN_ERR, target->scsi_host,
 871                                      "Null scmnd for RSP w/tag %016llx\n",
 872                                      (unsigned long long) rsp->tag);
 873                 scmnd->result = rsp->status;
 874
 875                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 876                         memcpy(scmnd->sense_buffer, rsp->data +
 877                                be32_to_cpu(rsp->resp_data_len),
 878                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 879                                      SCSI_SENSE_BUFFERSIZE));
 880                 }
 881
 882                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 883                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 884                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 885                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 886
 887                 if (!req->tsk_mgmt) {
 888                         scmnd->host_scribble = (void *) -1L;
 889                         scmnd->scsi_done(scmnd);
 890
 891                         srp_remove_req(target, req);
 892                 } else
 893                         req->cmd_done = 1;
 894         }
 895
 896         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 897 }
 898
 899 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 900 {
 901         struct ib_device *dev;
 902         struct srp_iu *iu;
 903         int res;
 904         u8 opcode;
 905
 906         iu = target->rx_ring[wc->wr_id];
 907
 908         dev = target->srp_host->srp_dev->dev;
 909         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 910                                    DMA_FROM_DEVICE);
 911
 912         opcode = *(u8 *) iu->buf;
 913
 914         if (0) {
 915                 shost_printk(KERN_ERR, target->scsi_host,
 916                              PFX "recv completion, opcode 0x%02x\n", opcode);
 917                 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
 918                                iu->buf, wc->byte_len, true);
 919         }
 920
 921         switch (opcode) {
 922         case SRP_RSP:
 923                 srp_process_rsp(target, iu->buf);
 924                 break;
 925
 926         case SRP_T_LOGOUT:
 927                 /* XXX Handle target logout */
 928                 shost_printk(KERN_WARNING, target->scsi_host,
 929                              PFX "Got target logout request\n");
 930                 break;
 931
 932         default:
 933                 shost_printk(KERN_WARNING, target->scsi_host,
 934                              PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 935                 break;
 936         }
 937
 938         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 939                                       DMA_FROM_DEVICE);
 940
 941         res = srp_post_recv(target);
 942         if (res != 0)
 943                 shost_printk(KERN_ERR, target->scsi_host,
 944                              PFX "Recv failed with error code %d\n", res);
 945 }
 946
 947 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
 948 {
 949         struct srp_target_port *target = target_ptr;
 950         struct ib_wc wc;
 951
 952         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 953         while (ib_poll_cq(cq, 1, &wc) > 0) {
 954                 if (wc.status) {
 955                         shost_printk(KERN_ERR, target->scsi_host,
 956                                      PFX "failed receive status %d\n",
 957                                      wc.status);
 958                         target->qp_in_error = 1;
 959                         break;
 960                 }
 961
 962                 srp_handle_recv(target, &wc);
 963         }
 964 }
 965
 966 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
 967 {
 968         struct srp_target_port *target = target_ptr;
 969         struct ib_wc wc;
 970
 971         while (ib_poll_cq(cq, 1, &wc) > 0) {
 972                 if (wc.status) {
 973                         shost_printk(KERN_ERR, target->scsi_host,
 974                                      PFX "failed send status %d\n",
 975                                      wc.status);
 976                         target->qp_in_error = 1;
 977                         break;
 978                 }
 979
 980                 ++target->tx_tail;
 981         }
 982 }
 983
 984 /*
 985  * Must be called with target->scsi_host->host_lock held to protect
 986  * req_lim and tx_head.  Lock cannot be dropped between call here and
 987  * call to __srp_post_send().
 988  */
 989 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
 990                                         enum srp_request_type req_type)
 991 {
 992         s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;
 993
 994         srp_send_completion(target->send_cq, target);
 995
 996         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 997                 return NULL;
 998
 999         if (target->req_lim < min) {
1000                 ++target->zero_req_lim;
1001                 return NULL;
1002         }
1003
1004         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
1005 }
1006
1007 /*
1008  * Must be called with target->scsi_host->host_lock held to protect
1009  * req_lim and tx_head.
1010  */
1011 static int __srp_post_send(struct srp_target_port *target,
1012                            struct srp_iu *iu, int len)
1013 {
1014         struct ib_sge list;
1015         struct ib_send_wr wr, *bad_wr;
1016         int ret = 0;
1017
1018         list.addr   = iu->dma;
1019         list.length = len;
1020         list.lkey   = target->srp_host->srp_dev->mr->lkey;
1021
1022         wr.next       = NULL;
1023         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
1024         wr.sg_list    = &list;
1025         wr.num_sge    = 1;
1026         wr.opcode     = IB_WR_SEND;
1027         wr.send_flags = IB_SEND_SIGNALED;
1028
1029         ret = ib_post_send(target->qp, &wr, &bad_wr);
1030
1031         if (!ret) {
1032                 ++target->tx_head;
1033                 --target->req_lim;
1034         }
1035
1036         return ret;
1037 }
1038
1039 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1040                             void (*done)(struct scsi_cmnd *))
1041 {
1042         struct srp_target_port *target = host_to_target(scmnd->device->host);
1043         struct srp_request *req;
1044         struct srp_iu *iu;
1045         struct srp_cmd *cmd;
1046         struct ib_device *dev;
1047         int len;
1048
1049         if (target->state == SRP_TARGET_CONNECTING)
1050                 goto err;
1051
1052         if (target->state == SRP_TARGET_DEAD ||
1053             target->state == SRP_TARGET_REMOVED) {
1054                 scmnd->result = DID_BAD_TARGET << 16;
1055                 done(scmnd);
1056                 return 0;
1057         }
1058
1059         iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1060         if (!iu)
1061                 goto err;
1062
1063         dev = target->srp_host->srp_dev->dev;
1064         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1065                                    DMA_TO_DEVICE);
1066
1067         req = list_entry(target->free_reqs.next, struct srp_request, list);
1068
1069         scmnd->scsi_done     = done;
1070         scmnd->result        = 0;
1071         scmnd->host_scribble = (void *) (long) req->index;
1072
1073         cmd = iu->buf;
1074         memset(cmd, 0, sizeof *cmd);
1075
1076         cmd->opcode = SRP_CMD;
1077         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1078         cmd->tag    = req->index;
1079         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1080
1081         req->scmnd    = scmnd;
1082         req->cmd      = iu;
1083         req->cmd_done = 0;
1084         req->tsk_mgmt = NULL;
1085
1086         len = srp_map_data(scmnd, target, req);
1087         if (len < 0) {
1088                 shost_printk(KERN_ERR, target->scsi_host,
1089                              PFX "Failed to map data\n");
1090                 goto err;
1091         }
1092
1093         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1094                                       DMA_TO_DEVICE);
1095
1096         if (__srp_post_send(target, iu, len)) {
1097                 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1098                 goto err_unmap;
1099         }
1100
1101         list_move_tail(&req->list, &target->req_queue);
1102
1103         return 0;
1104
1105 err_unmap:
1106         srp_unmap_data(scmnd, target, req);
1107
1108 err:
1109         return SCSI_MLQUEUE_HOST_BUSY;
1110 }
1111
1112 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1113 {
1114         int i;
1115
1116         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1117                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1118                                                   target->max_ti_iu_len,
1119                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1120                 if (!target->rx_ring[i])
1121                         goto err;
1122         }
1123
1124         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1125                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1126                                                   srp_max_iu_len,
1127                                                   GFP_KERNEL, DMA_TO_DEVICE);
1128                 if (!target->tx_ring[i])
1129                         goto err;
1130         }
1131
1132         return 0;
1133
1134 err:
1135         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1136                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1137                 target->rx_ring[i] = NULL;
1138         }
1139
1140         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1141                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1142                 target->tx_ring[i] = NULL;
1143         }
1144
1145         return -ENOMEM;
1146 }
1147
1148 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1149                                struct ib_cm_event *event,
1150                                struct srp_target_port *target)
1151 {
1152         struct Scsi_Host *shost = target->scsi_host;
1153         struct ib_class_port_info *cpi;
1154         int opcode;
1155
1156         switch (event->param.rej_rcvd.reason) {
1157         case IB_CM_REJ_PORT_CM_REDIRECT:
1158                 cpi = event->param.rej_rcvd.ari;
1159                 target->path.dlid = cpi->redirect_lid;
1160                 target->path.pkey = cpi->redirect_pkey;
1161                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1162                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1163
1164                 target->status = target->path.dlid ?
1165                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1166                 break;
1167
1168         case IB_CM_REJ_PORT_REDIRECT:
1169                 if (srp_target_is_topspin(target)) {
1170                         /*
1171                          * Topspin/Cisco SRP gateways incorrectly send
1172                          * reject reason code 25 when they mean 24
1173                          * (port redirect).
1174                          */
1175                         memcpy(target->path.dgid.raw,
1176                                event->param.rej_rcvd.ari, 16);
1177
1178                         shost_printk(KERN_DEBUG, shost,
1179                                      PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1180                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1181                                      (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1182
1183                         target->status = SRP_PORT_REDIRECT;
1184                 } else {
1185                         shost_printk(KERN_WARNING, shost,
1186                                      "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1187                         target->status = -ECONNRESET;
1188                 }
1189                 break;
1190
1191         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1192                 shost_printk(KERN_WARNING, shost,
1193                             "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1194                 target->status = -ECONNRESET;
1195                 break;
1196
1197         case IB_CM_REJ_CONSUMER_DEFINED:
1198                 opcode = *(u8 *) event->private_data;
1199                 if (opcode == SRP_LOGIN_REJ) {
1200                         struct srp_login_rej *rej = event->private_data;
1201                         u32 reason = be32_to_cpu(rej->reason);
1202
1203                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1204                                 shost_printk(KERN_WARNING, shost,
1205                                              PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1206                         else
1207                                 shost_printk(KERN_WARNING, shost,
1208                                             PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1209                 } else
1210                         shost_printk(KERN_WARNING, shost,
1211                                      "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1212                                      " opcode 0x%02x\n", opcode);
1213                 target->status = -ECONNRESET;
1214                 break;
1215
1216         case IB_CM_REJ_STALE_CONN:
1217                 shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
1218                 target->status = SRP_STALE_CONN;
1219                 break;
1220
1221         default:
1222                 shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
1223                              event->param.rej_rcvd.reason);
1224                 target->status = -ECONNRESET;
1225         }
1226 }
1227
1228 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1229 {
1230         struct srp_target_port *target = cm_id->context;
1231         struct ib_qp_attr *qp_attr = NULL;
1232         int attr_mask = 0;
1233         int comp = 0;
1234         int opcode = 0;
1235         int i;
1236
1237         switch (event->event) {
1238         case IB_CM_REQ_ERROR:
1239                 shost_printk(KERN_DEBUG, target->scsi_host,
1240                              PFX "Sending CM REQ failed\n");
1241                 comp = 1;
1242                 target->status = -ECONNRESET;
1243                 break;
1244
1245         case IB_CM_REP_RECEIVED:
1246                 comp = 1;
1247                 opcode = *(u8 *) event->private_data;
1248
1249                 if (opcode == SRP_LOGIN_RSP) {
1250                         struct srp_login_rsp *rsp = event->private_data;
1251
1252                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1253                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1254
1255                         target->scsi_host->can_queue = min(target->req_lim,
1256                                                            target->scsi_host->can_queue);
1257                 } else {
1258                         shost_printk(KERN_WARNING, target->scsi_host,
1259                                     PFX "Unhandled RSP opcode %#x\n", opcode);
1260                         target->status = -ECONNRESET;
1261                         break;
1262                 }
1263
1264                 if (!target->rx_ring[0]) {
1265                         target->status = srp_alloc_iu_bufs(target);
1266                         if (target->status)
1267                                 break;
1268                 }
1269
1270                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1271                 if (!qp_attr) {
1272                         target->status = -ENOMEM;
1273                         break;
1274                 }
1275
1276                 qp_attr->qp_state = IB_QPS_RTR;
1277                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1278                 if (target->status)
1279                         break;
1280
1281                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1282                 if (target->status)
1283                         break;
1284
1285                 for (i = 0; i < SRP_RQ_SIZE; i++) {
1286                         target->status = srp_post_recv(target);
1287                         if (target->status)
1288                                 break;
1289                 }
1290                 if (target->status)
1291                         break;
1292
1293                 qp_attr->qp_state = IB_QPS_RTS;
1294                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1295                 if (target->status)
1296                         break;
1297
1298                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1299                 if (target->status)
1300                         break;
1301
1302                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1303                 if (target->status)
1304                         break;
1305
1306                 break;
1307
1308         case IB_CM_REJ_RECEIVED:
1309                 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1310                 comp = 1;
1311
1312                 srp_cm_rej_handler(cm_id, event, target);
1313                 break;
1314
1315         case IB_CM_DREQ_RECEIVED:
1316                 shost_printk(KERN_WARNING, target->scsi_host,
1317                              PFX "DREQ received - connection closed\n");
1318                 if (ib_send_cm_drep(cm_id, NULL, 0))
1319                         shost_printk(KERN_ERR, target->scsi_host,
1320                                      PFX "Sending CM DREP failed\n");
1321                 break;
1322
1323         case IB_CM_TIMEWAIT_EXIT:
1324                 shost_printk(KERN_ERR, target->scsi_host,
1325                              PFX "connection closed\n");
1326
1327                 comp = 1;
1328                 target->status = 0;
1329                 break;
1330
1331         case IB_CM_MRA_RECEIVED:
1332         case IB_CM_DREQ_ERROR:
1333         case IB_CM_DREP_RECEIVED:
1334                 break;
1335
1336         default:
1337                 shost_printk(KERN_WARNING, target->scsi_host,
1338                              PFX "Unhandled CM event %d\n", event->event);
1339                 break;
1340         }
1341
1342         if (comp)
1343                 complete(&target->done);
1344
1345         kfree(qp_attr);
1346
1347         return 0;
1348 }
1349
1350 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1351                              struct srp_request *req, u8 func)
1352 {
1353         struct srp_iu *iu;
1354         struct srp_tsk_mgmt *tsk_mgmt;
1355
1356         spin_lock_irq(target->scsi_host->host_lock);
1357
1358         if (target->state == SRP_TARGET_DEAD ||
1359             target->state == SRP_TARGET_REMOVED) {
1360                 req->scmnd->result = DID_BAD_TARGET << 16;
1361                 goto out;
1362         }
1363
1364         init_completion(&req->done);
1365
1366         iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1367         if (!iu)
1368                 goto out;
1369
1370         tsk_mgmt = iu->buf;
1371         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1372
1373         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1374         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1375         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1376         tsk_mgmt->tsk_mgmt_func = func;
1377         tsk_mgmt->task_tag      = req->index;
1378
1379         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1380                 goto out;
1381
1382         req->tsk_mgmt = iu;
1383
1384         spin_unlock_irq(target->scsi_host->host_lock);
1385
1386         if (!wait_for_completion_timeout(&req->done,
1387                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1388                 return -1;
1389
1390         return 0;
1391
1392 out:
1393         spin_unlock_irq(target->scsi_host->host_lock);
1394         return -1;
1395 }
1396
1397 static int srp_find_req(struct srp_target_port *target,
1398                         struct scsi_cmnd *scmnd,
1399                         struct srp_request **req)
1400 {
1401         if (scmnd->host_scribble == (void *) -1L)
1402                 return -1;
1403
1404         *req = &target->req_ring[(long) scmnd->host_scribble];
1405
1406         return 0;
1407 }
1408
1409 static int srp_abort(struct scsi_cmnd *scmnd)
1410 {
1411         struct srp_target_port *target = host_to_target(scmnd->device->host);
1412         struct srp_request *req;
1413         int ret = SUCCESS;
1414
1415         shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1416
1417         if (target->qp_in_error)
1418                 return FAILED;
1419         if (srp_find_req(target, scmnd, &req))
1420                 return FAILED;
1421         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1422                 return FAILED;
1423
1424         spin_lock_irq(target->scsi_host->host_lock);
1425
1426         if (req->cmd_done) {
1427                 srp_remove_req(target, req);
1428                 scmnd->scsi_done(scmnd);
1429         } else if (!req->tsk_status) {
1430                 srp_remove_req(target, req);
1431                 scmnd->result = DID_ABORT << 16;
1432         } else
1433                 ret = FAILED;
1434
1435         spin_unlock_irq(target->scsi_host->host_lock);
1436
1437         return ret;
1438 }
1439
1440 static int srp_reset_device(struct scsi_cmnd *scmnd)
1441 {
1442         struct srp_target_port *target = host_to_target(scmnd->device->host);
1443         struct srp_request *req, *tmp;
1444
1445         shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1446
1447         if (target->qp_in_error)
1448                 return FAILED;
1449         if (srp_find_req(target, scmnd, &req))
1450                 return FAILED;
1451         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1452                 return FAILED;
1453         if (req->tsk_status)
1454                 return FAILED;
1455
1456         spin_lock_irq(target->scsi_host->host_lock);
1457
1458         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1459                 if (req->scmnd->device == scmnd->device)
1460                         srp_reset_req(target, req);
1461
1462         spin_unlock_irq(target->scsi_host->host_lock);
1463
1464         return SUCCESS;
1465 }
1466
1467 static int srp_reset_host(struct scsi_cmnd *scmnd)
1468 {
1469         struct srp_target_port *target = host_to_target(scmnd->device->host);
1470         int ret = FAILED;
1471
1472         shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1473
1474         if (!srp_reconnect_target(target))
1475                 ret = SUCCESS;
1476
1477         return ret;
1478 }
1479
1480 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1481                            char *buf)
1482 {
1483         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1484
1485         if (target->state == SRP_TARGET_DEAD ||
1486             target->state == SRP_TARGET_REMOVED)
1487                 return -ENODEV;
1488
1489         return sprintf(buf, "0x%016llx\n",
1490                        (unsigned long long) be64_to_cpu(target->id_ext));
1491 }
1492
1493 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1494                              char *buf)
1495 {
1496         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1497
1498         if (target->state == SRP_TARGET_DEAD ||
1499             target->state == SRP_TARGET_REMOVED)
1500                 return -ENODEV;
1501
1502         return sprintf(buf, "0x%016llx\n",
1503                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1504 }
1505
1506 static ssize_t show_service_id(struct device *dev,
1507                                struct device_attribute *attr, char *buf)
1508 {
1509         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1510
1511         if (target->state == SRP_TARGET_DEAD ||
1512             target->state == SRP_TARGET_REMOVED)
1513                 return -ENODEV;
1514
1515         return sprintf(buf, "0x%016llx\n",
1516                        (unsigned long long) be64_to_cpu(target->service_id));
1517 }
1518
1519 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1520                          char *buf)
1521 {
1522         struct srp_target_port *target = host_to_target(class_to_shost(dev));
1523
1524         if (target->state == SRP_TARGET_DEAD ||
1525             target->state == SRP_TARGET_REMOVED)
1526                 return -ENODEV;
1527
1528         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1529 }
1530
1531 static ssize_t show_dgid(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, "%pI6\n", target->path.dgid.raw);
1541 }
1542
1543 static ssize_t show_orig_dgid(struct device *dev,
1544                               struct device_attribute *attr, 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->orig_dgid);
1553 }
1554
1555 static ssize_t show_req_lim(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, "%d\n", target->req_lim);
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(req_lim,         S_IRUGO, show_req_lim,         NULL);
1602 static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1603 static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1604 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1605
1606 static struct device_attribute *srp_host_attrs[] = {
1607         &dev_attr_id_ext,
1608         &dev_attr_ioc_guid,
1609         &dev_attr_service_id,
1610         &dev_attr_pkey,
1611         &dev_attr_dgid,
1612         &dev_attr_orig_dgid,
1613         &dev_attr_req_lim,
1614         &dev_attr_zero_req_lim,
1615         &dev_attr_local_ib_port,
1616         &dev_attr_local_ib_device,
1617         NULL
1618 };
1619
1620 static struct scsi_host_template srp_template = {
1621         .module                         = THIS_MODULE,
1622         .name                           = "InfiniBand SRP initiator",
1623         .proc_name                      = DRV_NAME,
1624         .info                           = srp_target_info,
1625         .queuecommand                   = srp_queuecommand,
1626         .eh_abort_handler               = srp_abort,
1627         .eh_device_reset_handler        = srp_reset_device,
1628         .eh_host_reset_handler          = srp_reset_host,
1629         .can_queue                      = SRP_SQ_SIZE,
1630         .this_id                        = -1,
1631         .cmd_per_lun                    = SRP_SQ_SIZE,
1632         .use_clustering                 = ENABLE_CLUSTERING,
1633         .shost_attrs                    = srp_host_attrs
1634 };
1635
1636 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1637 {
1638         struct srp_rport_identifiers ids;
1639         struct srp_rport *rport;
1640
1641         sprintf(target->target_name, "SRP.T10:%016llX",
1642                  (unsigned long long) be64_to_cpu(target->id_ext));
1643
1644         if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1645                 return -ENODEV;
1646
1647         memcpy(ids.port_id, &target->id_ext, 8);
1648         memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1649         ids.roles = SRP_RPORT_ROLE_TARGET;
1650         rport = srp_rport_add(target->scsi_host, &ids);
1651         if (IS_ERR(rport)) {
1652                 scsi_remove_host(target->scsi_host);
1653                 return PTR_ERR(rport);
1654         }
1655
1656         spin_lock(&host->target_lock);
1657         list_add_tail(&target->list, &host->target_list);
1658         spin_unlock(&host->target_lock);
1659
1660         target->state = SRP_TARGET_LIVE;
1661
1662         scsi_scan_target(&target->scsi_host->shost_gendev,
1663                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1664
1665         return 0;
1666 }
1667
1668 static void srp_release_dev(struct device *dev)
1669 {
1670         struct srp_host *host =
1671                 container_of(dev, struct srp_host, dev);
1672
1673         complete(&host->released);
1674 }
1675
1676 static struct class srp_class = {
1677         .name    = "infiniband_srp",
1678         .dev_release = srp_release_dev
1679 };
1680
1681 /*
1682  * Target ports are added by writing
1683  *
1684  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1685  *     pkey=<P_Key>,service_id=<service ID>
1686  *
1687  * to the add_target sysfs attribute.
1688  */
1689 enum {
1690         SRP_OPT_ERR             = 0,
1691         SRP_OPT_ID_EXT          = 1 << 0,
1692         SRP_OPT_IOC_GUID        = 1 << 1,
1693         SRP_OPT_DGID            = 1 << 2,
1694         SRP_OPT_PKEY            = 1 << 3,
1695         SRP_OPT_SERVICE_ID      = 1 << 4,
1696         SRP_OPT_MAX_SECT        = 1 << 5,
1697         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1698         SRP_OPT_IO_CLASS        = 1 << 7,
1699         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1700         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1701                                    SRP_OPT_IOC_GUID     |
1702                                    SRP_OPT_DGID         |
1703                                    SRP_OPT_PKEY         |
1704                                    SRP_OPT_SERVICE_ID),
1705 };
1706
1707 static const match_table_t srp_opt_tokens = {
1708         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1709         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1710         { SRP_OPT_DGID,                 "dgid=%s"               },
1711         { SRP_OPT_PKEY,                 "pkey=%x"               },
1712         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1713         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1714         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1715         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1716         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1717         { SRP_OPT_ERR,                  NULL                    }
1718 };
1719
1720 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1721 {
1722         char *options, *sep_opt;
1723         char *p;
1724         char dgid[3];
1725         substring_t args[MAX_OPT_ARGS];
1726         int opt_mask = 0;
1727         int token;
1728         int ret = -EINVAL;
1729         int i;
1730
1731         options = kstrdup(buf, GFP_KERNEL);
1732         if (!options)
1733                 return -ENOMEM;
1734
1735         sep_opt = options;
1736         while ((p = strsep(&sep_opt, ",")) != NULL) {
1737                 if (!*p)
1738                         continue;
1739
1740                 token = match_token(p, srp_opt_tokens, args);
1741                 opt_mask |= token;
1742
1743                 switch (token) {
1744                 case SRP_OPT_ID_EXT:
1745                         p = match_strdup(args);
1746                         if (!p) {
1747                                 ret = -ENOMEM;
1748                                 goto out;
1749                         }
1750                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1751                         kfree(p);
1752                         break;
1753
1754                 case SRP_OPT_IOC_GUID:
1755                         p = match_strdup(args);
1756                         if (!p) {
1757                                 ret = -ENOMEM;
1758                                 goto out;
1759                         }
1760                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1761                         kfree(p);
1762                         break;
1763
1764                 case SRP_OPT_DGID:
1765                         p = match_strdup(args);
1766                         if (!p) {
1767                                 ret = -ENOMEM;
1768                                 goto out;
1769                         }
1770                         if (strlen(p) != 32) {
1771                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1772                                 kfree(p);
1773                                 goto out;
1774                         }
1775
1776                         for (i = 0; i < 16; ++i) {
1777                                 strlcpy(dgid, p + i * 2, 3);
1778                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1779                         }
1780                         kfree(p);
1781                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1782                         break;
1783
1784                 case SRP_OPT_PKEY:
1785                         if (match_hex(args, &token)) {
1786                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1787                                 goto out;
1788                         }
1789                         target->path.pkey = cpu_to_be16(token);
1790                         break;
1791
1792                 case SRP_OPT_SERVICE_ID:
1793                         p = match_strdup(args);
1794                         if (!p) {
1795                                 ret = -ENOMEM;
1796                                 goto out;
1797                         }
1798                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1799                         target->path.service_id = target->service_id;
1800                         kfree(p);
1801                         break;
1802
1803                 case SRP_OPT_MAX_SECT:
1804                         if (match_int(args, &token)) {
1805                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1806                                 goto out;
1807                         }
1808                         target->scsi_host->max_sectors = token;
1809                         break;
1810
1811                 case SRP_OPT_MAX_CMD_PER_LUN:
1812                         if (match_int(args, &token)) {
1813                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1814                                 goto out;
1815                         }
1816                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1817                         break;
1818
1819                 case SRP_OPT_IO_CLASS:
1820                         if (match_hex(args, &token)) {
1821                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1822                                 goto out;
1823                         }
1824                         if (token != SRP_REV10_IB_IO_CLASS &&
1825                             token != SRP_REV16A_IB_IO_CLASS) {
1826                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1827                                        " %x specified (use %x or %x).\n",
1828                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1829                                 goto out;
1830                         }
1831                         target->io_class = token;
1832                         break;
1833
1834                 case SRP_OPT_INITIATOR_EXT:
1835                         p = match_strdup(args);
1836                         if (!p) {
1837                                 ret = -ENOMEM;
1838                                 goto out;
1839                         }
1840                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1841                         kfree(p);
1842                         break;
1843
1844                 default:
1845                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1846                                "'%s' in target creation request\n", p);
1847                         goto out;
1848                 }
1849         }
1850
1851         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1852                 ret = 0;
1853         else
1854                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1855                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1856                             !(srp_opt_tokens[i].token & opt_mask))
1857                                 printk(KERN_WARNING PFX "target creation request is "
1858                                        "missing parameter '%s'\n",
1859                                        srp_opt_tokens[i].pattern);
1860
1861 out:
1862         kfree(options);
1863         return ret;
1864 }
1865
1866 static ssize_t srp_create_target(struct device *dev,
1867                                  struct device_attribute *attr,
1868                                  const char *buf, size_t count)
1869 {
1870         struct srp_host *host =
1871                 container_of(dev, struct srp_host, dev);
1872         struct Scsi_Host *target_host;
1873         struct srp_target_port *target;
1874         int ret;
1875         int i;
1876
1877         target_host = scsi_host_alloc(&srp_template,
1878                                       sizeof (struct srp_target_port));
1879         if (!target_host)
1880                 return -ENOMEM;
1881
1882         target_host->transportt = ib_srp_transport_template;
1883         target_host->max_lun     = SRP_MAX_LUN;
1884         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1885
1886         target = host_to_target(target_host);
1887
1888         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1889         target->scsi_host  = target_host;
1890         target->srp_host   = host;
1891
1892         INIT_LIST_HEAD(&target->free_reqs);
1893         INIT_LIST_HEAD(&target->req_queue);
1894         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1895                 target->req_ring[i].index = i;
1896                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1897         }
1898
1899         ret = srp_parse_options(buf, target);
1900         if (ret)
1901                 goto err;
1902
1903         ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1904
1905         shost_printk(KERN_DEBUG, target->scsi_host, PFX
1906                      "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1907                      "service_id %016llx dgid %pI6\n",
1908                (unsigned long long) be64_to_cpu(target->id_ext),
1909                (unsigned long long) be64_to_cpu(target->ioc_guid),
1910                be16_to_cpu(target->path.pkey),
1911                (unsigned long long) be64_to_cpu(target->service_id),
1912                target->path.dgid.raw);
1913
1914         ret = srp_create_target_ib(target);
1915         if (ret)
1916                 goto err;
1917
1918         ret = srp_new_cm_id(target);
1919         if (ret)
1920                 goto err_free;
1921
1922         target->qp_in_error = 0;
1923         ret = srp_connect_target(target);
1924         if (ret) {
1925                 shost_printk(KERN_ERR, target->scsi_host,
1926                              PFX "Connection failed\n");
1927                 goto err_cm_id;
1928         }
1929
1930         ret = srp_add_target(host, target);
1931         if (ret)
1932                 goto err_disconnect;
1933
1934         return count;
1935
1936 err_disconnect:
1937         srp_disconnect_target(target);
1938
1939 err_cm_id:
1940         ib_destroy_cm_id(target->cm_id);
1941
1942 err_free:
1943         srp_free_target_ib(target);
1944
1945 err:
1946         scsi_host_put(target_host);
1947
1948         return ret;
1949 }
1950
1951 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1952
1953 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1954                           char *buf)
1955 {
1956         struct srp_host *host = container_of(dev, struct srp_host, dev);
1957
1958         return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1959 }
1960
1961 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1962
1963 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1964                          char *buf)
1965 {
1966         struct srp_host *host = container_of(dev, struct srp_host, dev);
1967
1968         return sprintf(buf, "%d\n", host->port);
1969 }
1970
1971 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1972
1973 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1974 {
1975         struct srp_host *host;
1976
1977         host = kzalloc(sizeof *host, GFP_KERNEL);
1978         if (!host)
1979                 return NULL;
1980
1981         INIT_LIST_HEAD(&host->target_list);
1982         spin_lock_init(&host->target_lock);
1983         init_completion(&host->released);
1984         host->srp_dev = device;
1985         host->port = port;
1986
1987         host->dev.class = &srp_class;
1988         host->dev.parent = device->dev->dma_device;
1989         dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
1990
1991         if (device_register(&host->dev))
1992                 goto free_host;
1993         if (device_create_file(&host->dev, &dev_attr_add_target))
1994                 goto err_class;
1995         if (device_create_file(&host->dev, &dev_attr_ibdev))
1996                 goto err_class;
1997         if (device_create_file(&host->dev, &dev_attr_port))
1998                 goto err_class;
1999
2000         return host;
2001
2002 err_class:
2003         device_unregister(&host->dev);
2004
2005 free_host:
2006         kfree(host);
2007
2008         return NULL;
2009 }
2010
2011 static void srp_add_one(struct ib_device *device)
2012 {
2013         struct srp_device *srp_dev;
2014         struct ib_device_attr *dev_attr;
2015         struct ib_fmr_pool_param fmr_param;
2016         struct srp_host *host;
2017         int s, e, p;
2018
2019         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2020         if (!dev_attr)
2021                 return;
2022
2023         if (ib_query_device(device, dev_attr)) {
2024                 printk(KERN_WARNING PFX "Query device failed for %s\n",
2025                        device->name);
2026                 goto free_attr;
2027         }
2028
2029         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2030         if (!srp_dev)
2031                 goto free_attr;
2032
2033         /*
2034          * Use the smallest page size supported by the HCA, down to a
2035          * minimum of 512 bytes (which is the smallest sector that a
2036          * SCSI command will ever carry).
2037          */
2038         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2039         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
2040         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2041
2042         INIT_LIST_HEAD(&srp_dev->dev_list);
2043
2044         srp_dev->dev = device;
2045         srp_dev->pd  = ib_alloc_pd(device);
2046         if (IS_ERR(srp_dev->pd))
2047                 goto free_dev;
2048
2049         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2050                                     IB_ACCESS_LOCAL_WRITE |
2051                                     IB_ACCESS_REMOTE_READ |
2052                                     IB_ACCESS_REMOTE_WRITE);
2053         if (IS_ERR(srp_dev->mr))
2054                 goto err_pd;
2055
2056         memset(&fmr_param, 0, sizeof fmr_param);
2057         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
2058         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
2059         fmr_param.cache             = 1;
2060         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2061         fmr_param.page_shift        = srp_dev->fmr_page_shift;
2062         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
2063                                        IB_ACCESS_REMOTE_WRITE |
2064                                        IB_ACCESS_REMOTE_READ);
2065
2066         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2067         if (IS_ERR(srp_dev->fmr_pool))
2068                 srp_dev->fmr_pool = NULL;
2069
2070         if (device->node_type == RDMA_NODE_IB_SWITCH) {
2071                 s = 0;
2072                 e = 0;
2073         } else {
2074                 s = 1;
2075                 e = device->phys_port_cnt;
2076         }
2077
2078         for (p = s; p <= e; ++p) {
2079                 host = srp_add_port(srp_dev, p);
2080                 if (host)
2081                         list_add_tail(&host->list, &srp_dev->dev_list);
2082         }
2083
2084         ib_set_client_data(device, &srp_client, srp_dev);
2085
2086         goto free_attr;
2087
2088 err_pd:
2089         ib_dealloc_pd(srp_dev->pd);
2090
2091 free_dev:
2092         kfree(srp_dev);
2093
2094 free_attr:
2095         kfree(dev_attr);
2096 }
2097
2098 static void srp_remove_one(struct ib_device *device)
2099 {
2100         struct srp_device *srp_dev;
2101         struct srp_host *host, *tmp_host;
2102         LIST_HEAD(target_list);
2103         struct srp_target_port *target, *tmp_target;
2104
2105         srp_dev = ib_get_client_data(device, &srp_client);
2106
2107         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2108                 device_unregister(&host->dev);
2109                 /*
2110                  * Wait for the sysfs entry to go away, so that no new
2111                  * target ports can be created.
2112                  */
2113                 wait_for_completion(&host->released);
2114
2115                 /*
2116                  * Mark all target ports as removed, so we stop queueing
2117                  * commands and don't try to reconnect.
2118                  */
2119                 spin_lock(&host->target_lock);
2120                 list_for_each_entry(target, &host->target_list, list) {
2121                         spin_lock_irq(target->scsi_host->host_lock);
2122                         target->state = SRP_TARGET_REMOVED;
2123                         spin_unlock_irq(target->scsi_host->host_lock);
2124                 }
2125                 spin_unlock(&host->target_lock);
2126
2127                 /*
2128                  * Wait for any reconnection tasks that may have
2129                  * started before we marked our target ports as
2130                  * removed, and any target port removal tasks.
2131                  */
2132                 flush_scheduled_work();
2133
2134                 list_for_each_entry_safe(target, tmp_target,
2135                                          &host->target_list, list) {
2136                         srp_remove_host(target->scsi_host);
2137                         scsi_remove_host(target->scsi_host);
2138                         srp_disconnect_target(target);
2139                         ib_destroy_cm_id(target->cm_id);
2140                         srp_free_target_ib(target);
2141                         scsi_host_put(target->scsi_host);
2142                 }
2143
2144                 kfree(host);
2145         }
2146
2147         if (srp_dev->fmr_pool)
2148                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2149         ib_dereg_mr(srp_dev->mr);
2150         ib_dealloc_pd(srp_dev->pd);
2151
2152         kfree(srp_dev);
2153 }
2154
2155 static struct srp_function_template ib_srp_transport_functions = {
2156 };
2157
2158 static int __init srp_init_module(void)
2159 {
2160         int ret;
2161
2162         if (srp_sg_tablesize > 255) {
2163                 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2164                 srp_sg_tablesize = 255;
2165         }
2166
2167         ib_srp_transport_template =
2168                 srp_attach_transport(&ib_srp_transport_functions);
2169         if (!ib_srp_transport_template)
2170                 return -ENOMEM;
2171
2172         srp_template.sg_tablesize = srp_sg_tablesize;
2173         srp_max_iu_len = (sizeof (struct srp_cmd) +
2174                           sizeof (struct srp_indirect_buf) +
2175                           srp_sg_tablesize * 16);
2176
2177         ret = class_register(&srp_class);
2178         if (ret) {
2179                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2180                 srp_release_transport(ib_srp_transport_template);
2181                 return ret;
2182         }
2183
2184         ib_sa_register_client(&srp_sa_client);
2185
2186         ret = ib_register_client(&srp_client);
2187         if (ret) {
2188                 printk(KERN_ERR PFX "couldn't register IB client\n");
2189                 srp_release_transport(ib_srp_transport_template);
2190                 ib_sa_unregister_client(&srp_sa_client);
2191                 class_unregister(&srp_class);
2192                 return ret;
2193         }
2194
2195         return 0;
2196 }
2197
2198 static void __exit srp_cleanup_module(void)
2199 {
2200         ib_unregister_client(&srp_client);
2201         ib_sa_unregister_client(&srp_sa_client);
2202         class_unregister(&srp_class);
2203         srp_release_transport(ib_srp_transport_template);
2204 }
2205
2206 module_init(srp_init_module);
2207 module_exit(srp_cleanup_module);