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