drivers/infiniband/ulp/srp/ib_srp.c

   1 /*
   2  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/err.h>
  39 #include <linux/string.h>
  40 #include <linux/parser.h>
  41 #include <linux/random.h>
  42 #include <linux/jiffies.h>
  43
  44 #include <asm/atomic.h>
  45
  46 #include <scsi/scsi.h>
  47 #include <scsi/scsi_device.h>
  48 #include <scsi/scsi_dbg.h>
  49 #include <scsi/srp.h>
  50
  51 #include <rdma/ib_cache.h>
  52
  53 #include "ib_srp.h"
  54
  55 #define DRV_NAME        "ib_srp"
  56 #define PFX             DRV_NAME ": "
  57 #define DRV_VERSION     "0.2"
  58 #define DRV_RELDATE     "November 1, 2005"
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
  62                    "v" DRV_VERSION " (" DRV_RELDATE ")");
  63 MODULE_LICENSE("Dual BSD/GPL");
  64
  65 static int topspin_workarounds = 1;
  66
  67 module_param(topspin_workarounds, int, 0444);
  68 MODULE_PARM_DESC(topspin_workarounds,
  69                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  70
  71 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
  72
  73 static void srp_add_one(struct ib_device *device);
  74 static void srp_remove_one(struct ib_device *device);
  75 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  76 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  77
  78 static struct ib_client srp_client = {
  79         .name   = "srp",
  80         .add    = srp_add_one,
  81         .remove = srp_remove_one
  82 };
  83
  84 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
  85 {
  86         return (struct srp_target_port *) host->hostdata;
  87 }
  88
  89 static const char *srp_target_info(struct Scsi_Host *host)
  90 {
  91         return host_to_target(host)->target_name;
  92 }
  93
  94 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
  95                                    gfp_t gfp_mask,
  96                                    enum dma_data_direction direction)
  97 {
  98         struct srp_iu *iu;
  99
 100         iu = kmalloc(sizeof *iu, gfp_mask);
 101         if (!iu)
 102                 goto out;
 103
 104         iu->buf = kzalloc(size, gfp_mask);
 105         if (!iu->buf)
 106                 goto out_free_iu;
 107
 108         iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
 109         if (dma_mapping_error(iu->dma))
 110                 goto out_free_buf;
 111
 112         iu->size      = size;
 113         iu->direction = direction;
 114
 115         return iu;
 116
 117 out_free_buf:
 118         kfree(iu->buf);
 119 out_free_iu:
 120         kfree(iu);
 121 out:
 122         return NULL;
 123 }
 124
 125 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 126 {
 127         if (!iu)
 128                 return;
 129
 130         dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
 131         kfree(iu->buf);
 132         kfree(iu);
 133 }
 134
 135 static void srp_qp_event(struct ib_event *event, void *context)
 136 {
 137         printk(KERN_ERR PFX "QP event %d\n", event->event);
 138 }
 139
 140 static int srp_init_qp(struct srp_target_port *target,
 141                        struct ib_qp *qp)
 142 {
 143         struct ib_qp_attr *attr;
 144         int ret;
 145
 146         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 147         if (!attr)
 148                 return -ENOMEM;
 149
 150         ret = ib_find_cached_pkey(target->srp_host->dev,
 151                                   target->srp_host->port,
 152                                   be16_to_cpu(target->path.pkey),
 153                                   &attr->pkey_index);
 154         if (ret)
 155                 goto out;
 156
 157         attr->qp_state        = IB_QPS_INIT;
 158         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 159                                     IB_ACCESS_REMOTE_WRITE);
 160         attr->port_num        = target->srp_host->port;
 161
 162         ret = ib_modify_qp(qp, attr,
 163                            IB_QP_STATE          |
 164                            IB_QP_PKEY_INDEX     |
 165                            IB_QP_ACCESS_FLAGS   |
 166                            IB_QP_PORT);
 167
 168 out:
 169         kfree(attr);
 170         return ret;
 171 }
 172
 173 static int srp_create_target_ib(struct srp_target_port *target)
 174 {
 175         struct ib_qp_init_attr *init_attr;
 176         int ret;
 177
 178         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 179         if (!init_attr)
 180                 return -ENOMEM;
 181
 182         target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
 183                                   NULL, target, SRP_CQ_SIZE);
 184         if (IS_ERR(target->cq)) {
 185                 ret = PTR_ERR(target->cq);
 186                 goto out;
 187         }
 188
 189         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 190
 191         init_attr->event_handler       = srp_qp_event;
 192         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 193         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 194         init_attr->cap.max_recv_sge    = 1;
 195         init_attr->cap.max_send_sge    = 1;
 196         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 197         init_attr->qp_type             = IB_QPT_RC;
 198         init_attr->send_cq             = target->cq;
 199         init_attr->recv_cq             = target->cq;
 200
 201         target->qp = ib_create_qp(target->srp_host->pd, init_attr);
 202         if (IS_ERR(target->qp)) {
 203                 ret = PTR_ERR(target->qp);
 204                 ib_destroy_cq(target->cq);
 205                 goto out;
 206         }
 207
 208         ret = srp_init_qp(target, target->qp);
 209         if (ret) {
 210                 ib_destroy_qp(target->qp);
 211                 ib_destroy_cq(target->cq);
 212                 goto out;
 213         }
 214
 215 out:
 216         kfree(init_attr);
 217         return ret;
 218 }
 219
 220 static void srp_free_target_ib(struct srp_target_port *target)
 221 {
 222         int i;
 223
 224         ib_destroy_qp(target->qp);
 225         ib_destroy_cq(target->cq);
 226
 227         for (i = 0; i < SRP_RQ_SIZE; ++i)
 228                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 229         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 230                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 231 }
 232
 233 static void srp_path_rec_completion(int status,
 234                                     struct ib_sa_path_rec *pathrec,
 235                                     void *target_ptr)
 236 {
 237         struct srp_target_port *target = target_ptr;
 238
 239         target->status = status;
 240         if (status)
 241                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
 242         else
 243                 target->path = *pathrec;
 244         complete(&target->done);
 245 }
 246
 247 static int srp_lookup_path(struct srp_target_port *target)
 248 {
 249         target->path.numb_path = 1;
 250
 251         init_completion(&target->done);
 252
 253         target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
 254                                                    target->srp_host->port,
 255                                                    &target->path,
 256                                                    IB_SA_PATH_REC_DGID          |
 257                                                    IB_SA_PATH_REC_SGID          |
 258                                                    IB_SA_PATH_REC_NUMB_PATH     |
 259                                                    IB_SA_PATH_REC_PKEY,
 260                                                    SRP_PATH_REC_TIMEOUT_MS,
 261                                                    GFP_KERNEL,
 262                                                    srp_path_rec_completion,
 263                                                    target, &target->path_query);
 264         if (target->path_query_id < 0)
 265                 return target->path_query_id;
 266
 267         wait_for_completion(&target->done);
 268
 269         if (target->status < 0)
 270                 printk(KERN_WARNING PFX "Path record query failed\n");
 271
 272         return target->status;
 273 }
 274
 275 static int srp_send_req(struct srp_target_port *target)
 276 {
 277         struct {
 278                 struct ib_cm_req_param param;
 279                 struct srp_login_req   priv;
 280         } *req = NULL;
 281         int status;
 282
 283         req = kzalloc(sizeof *req, GFP_KERNEL);
 284         if (!req)
 285                 return -ENOMEM;
 286
 287         req->param.primary_path               = &target->path;
 288         req->param.alternate_path             = NULL;
 289         req->param.service_id                 = target->service_id;
 290         req->param.qp_num                     = target->qp->qp_num;
 291         req->param.qp_type                    = target->qp->qp_type;
 292         req->param.private_data               = &req->priv;
 293         req->param.private_data_len           = sizeof req->priv;
 294         req->param.flow_control               = 1;
 295
 296         get_random_bytes(&req->param.starting_psn, 4);
 297         req->param.starting_psn              &= 0xffffff;
 298
 299         /*
 300          * Pick some arbitrary defaults here; we could make these
 301          * module parameters if anyone cared about setting them.
 302          */
 303         req->param.responder_resources        = 4;
 304         req->param.remote_cm_response_timeout = 20;
 305         req->param.local_cm_response_timeout  = 20;
 306         req->param.retry_count                = 7;
 307         req->param.rnr_retry_count            = 7;
 308         req->param.max_cm_retries             = 15;
 309
 310         req->priv.opcode        = SRP_LOGIN_REQ;
 311         req->priv.tag           = 0;
 312         req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
 313         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 314                                               SRP_BUF_FORMAT_INDIRECT);
 315         memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
 316         /*
 317          * Topspin/Cisco SRP targets will reject our login unless we
 318          * zero out the first 8 bytes of our initiator port ID.  The
 319          * second 8 bytes must be our local node GUID, but we always
 320          * use that anyway.
 321          */
 322         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 323                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 324                        "activated for target GUID %016llx\n",
 325                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 326                 memset(req->priv.initiator_port_id, 0, 8);
 327         }
 328         memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 329         memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 330
 331         status = ib_send_cm_req(target->cm_id, &req->param);
 332
 333         kfree(req);
 334
 335         return status;
 336 }
 337
 338 static void srp_disconnect_target(struct srp_target_port *target)
 339 {
 340         /* XXX should send SRP_I_LOGOUT request */
 341
 342         init_completion(&target->done);
 343         ib_send_cm_dreq(target->cm_id, NULL, 0);
 344         wait_for_completion(&target->done);
 345 }
 346
 347 static void srp_remove_work(void *target_ptr)
 348 {
 349         struct srp_target_port *target = target_ptr;
 350
 351         spin_lock_irq(target->scsi_host->host_lock);
 352         if (target->state != SRP_TARGET_DEAD) {
 353                 spin_unlock_irq(target->scsi_host->host_lock);
 354                 scsi_host_put(target->scsi_host);
 355                 return;
 356         }
 357         target->state = SRP_TARGET_REMOVED;
 358         spin_unlock_irq(target->scsi_host->host_lock);
 359
 360         mutex_lock(&target->srp_host->target_mutex);
 361         list_del(&target->list);
 362         mutex_unlock(&target->srp_host->target_mutex);
 363
 364         scsi_remove_host(target->scsi_host);
 365         ib_destroy_cm_id(target->cm_id);
 366         srp_free_target_ib(target);
 367         scsi_host_put(target->scsi_host);
 368         /* And another put to really free the target port... */
 369         scsi_host_put(target->scsi_host);
 370 }
 371
 372 static int srp_connect_target(struct srp_target_port *target)
 373 {
 374         int ret;
 375
 376         ret = srp_lookup_path(target);
 377         if (ret)
 378                 return ret;
 379
 380         while (1) {
 381                 init_completion(&target->done);
 382                 ret = srp_send_req(target);
 383                 if (ret)
 384                         return ret;
 385                 wait_for_completion(&target->done);
 386
 387                 /*
 388                  * The CM event handling code will set status to
 389                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 390                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 391                  * redirect REJ back.
 392                  */
 393                 switch (target->status) {
 394                 case 0:
 395                         return 0;
 396
 397                 case SRP_PORT_REDIRECT:
 398                         ret = srp_lookup_path(target);
 399                         if (ret)
 400                                 return ret;
 401                         break;
 402
 403                 case SRP_DLID_REDIRECT:
 404                         break;
 405
 406                 default:
 407                         return target->status;
 408                 }
 409         }
 410 }
 411
 412 static int srp_reconnect_target(struct srp_target_port *target)
 413 {
 414         struct ib_cm_id *new_cm_id;
 415         struct ib_qp_attr qp_attr;
 416         struct srp_request *req;
 417         struct ib_wc wc;
 418         int ret;
 419         int i;
 420
 421         spin_lock_irq(target->scsi_host->host_lock);
 422         if (target->state != SRP_TARGET_LIVE) {
 423                 spin_unlock_irq(target->scsi_host->host_lock);
 424                 return -EAGAIN;
 425         }
 426         target->state = SRP_TARGET_CONNECTING;
 427         spin_unlock_irq(target->scsi_host->host_lock);
 428
 429         srp_disconnect_target(target);
 430         /*
 431          * Now get a new local CM ID so that we avoid confusing the
 432          * target in case things are really fouled up.
 433          */
 434         new_cm_id = ib_create_cm_id(target->srp_host->dev,
 435                                     srp_cm_handler, target);
 436         if (IS_ERR(new_cm_id)) {
 437                 ret = PTR_ERR(new_cm_id);
 438                 goto err;
 439         }
 440         ib_destroy_cm_id(target->cm_id);
 441         target->cm_id = new_cm_id;
 442
 443         qp_attr.qp_state = IB_QPS_RESET;
 444         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 445         if (ret)
 446                 goto err;
 447
 448         ret = srp_init_qp(target, target->qp);
 449         if (ret)
 450                 goto err;
 451
 452         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 453                 ; /* nothing */
 454
 455         list_for_each_entry(req, &target->req_queue, list) {
 456                 req->scmnd->result = DID_RESET << 16;
 457                 req->scmnd->scsi_done(req->scmnd);
 458         }
 459
 460         target->rx_head  = 0;
 461         target->tx_head  = 0;
 462         target->tx_tail  = 0;
 463         target->req_head = 0;
 464         for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
 465                 target->req_ring[i].next = i + 1;
 466         target->req_ring[SRP_SQ_SIZE - 1].next = -1;
 467         INIT_LIST_HEAD(&target->req_queue);
 468
 469         ret = srp_connect_target(target);
 470         if (ret)
 471                 goto err;
 472
 473         spin_lock_irq(target->scsi_host->host_lock);
 474         if (target->state == SRP_TARGET_CONNECTING) {
 475                 ret = 0;
 476                 target->state = SRP_TARGET_LIVE;
 477         } else
 478                 ret = -EAGAIN;
 479         spin_unlock_irq(target->scsi_host->host_lock);
 480
 481         return ret;
 482
 483 err:
 484         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 485
 486         /*
 487          * We couldn't reconnect, so kill our target port off.
 488          * However, we have to defer the real removal because we might
 489          * be in the context of the SCSI error handler now, which
 490          * would deadlock if we call scsi_remove_host().
 491          */
 492         spin_lock_irq(target->scsi_host->host_lock);
 493         if (target->state == SRP_TARGET_CONNECTING) {
 494                 target->state = SRP_TARGET_DEAD;
 495                 INIT_WORK(&target->work, srp_remove_work, target);
 496                 schedule_work(&target->work);
 497         }
 498         spin_unlock_irq(target->scsi_host->host_lock);
 499
 500         return ret;
 501 }
 502
 503 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 504                         struct srp_request *req)
 505 {
 506         struct srp_cmd *cmd = req->cmd->buf;
 507         int len;
 508         u8 fmt;
 509
 510         if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
 511                 return sizeof (struct srp_cmd);
 512
 513         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 514             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 515                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 516                        scmnd->sc_data_direction);
 517                 return -EINVAL;
 518         }
 519
 520         if (scmnd->use_sg) {
 521                 struct scatterlist *scat = scmnd->request_buffer;
 522                 int n;
 523                 int i;
 524
 525                 n = dma_map_sg(target->srp_host->dev->dma_device,
 526                                scat, scmnd->use_sg, scmnd->sc_data_direction);
 527
 528                 if (n == 1) {
 529                         struct srp_direct_buf *buf = (void *) cmd->add_data;
 530
 531                         fmt = SRP_DATA_DESC_DIRECT;
 532
 533                         buf->va  = cpu_to_be64(sg_dma_address(scat));
 534                         buf->key = cpu_to_be32(target->srp_host->mr->rkey);
 535                         buf->len = cpu_to_be32(sg_dma_len(scat));
 536
 537                         len = sizeof (struct srp_cmd) +
 538                                 sizeof (struct srp_direct_buf);
 539                 } else {
 540                         struct srp_indirect_buf *buf = (void *) cmd->add_data;
 541                         u32 datalen = 0;
 542
 543                         fmt = SRP_DATA_DESC_INDIRECT;
 544
 545                         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 546                                 cmd->data_out_desc_cnt = n;
 547                         else
 548                                 cmd->data_in_desc_cnt = n;
 549
 550                         buf->table_desc.va  = cpu_to_be64(req->cmd->dma +
 551                                                           sizeof *cmd +
 552                                                           sizeof *buf);
 553                         buf->table_desc.key =
 554                                 cpu_to_be32(target->srp_host->mr->rkey);
 555                         buf->table_desc.len =
 556                                 cpu_to_be32(n * sizeof (struct srp_direct_buf));
 557
 558                         for (i = 0; i < n; ++i) {
 559                                 buf->desc_list[i].va  = cpu_to_be64(sg_dma_address(&scat[i]));
 560                                 buf->desc_list[i].key =
 561                                         cpu_to_be32(target->srp_host->mr->rkey);
 562                                 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
 563
 564                                 datalen += sg_dma_len(&scat[i]);
 565                         }
 566
 567                         buf->len = cpu_to_be32(datalen);
 568
 569                         len = sizeof (struct srp_cmd) +
 570                                 sizeof (struct srp_indirect_buf) +
 571                                 n * sizeof (struct srp_direct_buf);
 572                 }
 573         } else {
 574                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 575                 dma_addr_t dma;
 576
 577                 dma = dma_map_single(target->srp_host->dev->dma_device,
 578                                      scmnd->request_buffer, scmnd->request_bufflen,
 579                                      scmnd->sc_data_direction);
 580                 if (dma_mapping_error(dma)) {
 581                         printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
 582                                scmnd->request_buffer, (int) scmnd->request_bufflen,
 583                                scmnd->sc_data_direction);
 584                         return -EINVAL;
 585                 }
 586
 587                 pci_unmap_addr_set(req, direct_mapping, dma);
 588
 589                 buf->va  = cpu_to_be64(dma);
 590                 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
 591                 buf->len = cpu_to_be32(scmnd->request_bufflen);
 592
 593                 fmt = SRP_DATA_DESC_DIRECT;
 594
 595                 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 596         }
 597
 598         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 599                 cmd->buf_fmt = fmt << 4;
 600         else
 601                 cmd->buf_fmt = fmt;
 602
 603
 604         return len;
 605 }
 606
 607 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 608                            struct srp_target_port *target,
 609                            struct srp_request *req)
 610 {
 611         if (!scmnd->request_buffer ||
 612             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 613              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 614             return;
 615
 616         if (scmnd->use_sg)
 617                 dma_unmap_sg(target->srp_host->dev->dma_device,
 618                              (struct scatterlist *) scmnd->request_buffer,
 619                              scmnd->use_sg, scmnd->sc_data_direction);
 620         else
 621                 dma_unmap_single(target->srp_host->dev->dma_device,
 622                                  pci_unmap_addr(req, direct_mapping),
 623                                  scmnd->request_bufflen,
 624                                  scmnd->sc_data_direction);
 625 }
 626
 627 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 628 {
 629         struct srp_request *req;
 630         struct scsi_cmnd *scmnd;
 631         unsigned long flags;
 632         s32 delta;
 633
 634         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 635
 636         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 637
 638         target->req_lim += delta;
 639
 640         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 641
 642         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 643                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 644                         req->tsk_status = -1;
 645                 else
 646                         req->tsk_status = rsp->data[3];
 647                 complete(&req->done);
 648         } else {
 649                 scmnd         = req->scmnd;
 650                 if (!scmnd)
 651                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 652                                (unsigned long long) rsp->tag);
 653                 scmnd->result = rsp->status;
 654
 655                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 656                         memcpy(scmnd->sense_buffer, rsp->data +
 657                                be32_to_cpu(rsp->resp_data_len),
 658                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 659                                      SCSI_SENSE_BUFFERSIZE));
 660                 }
 661
 662                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 663                         scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
 664                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 665                         scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
 666
 667                 srp_unmap_data(scmnd, target, req);
 668
 669                 if (!req->tsk_mgmt) {
 670                         req->scmnd = NULL;
 671                         scmnd->host_scribble = (void *) -1L;
 672                         scmnd->scsi_done(scmnd);
 673
 674                         list_del(&req->list);
 675                         req->next = target->req_head;
 676                         target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
 677                 } else
 678                         req->cmd_done = 1;
 679         }
 680
 681         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 682 }
 683
 684 static void srp_reconnect_work(void *target_ptr)
 685 {
 686         struct srp_target_port *target = target_ptr;
 687
 688         srp_reconnect_target(target);
 689 }
 690
 691 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 692 {
 693         struct srp_iu *iu;
 694         u8 opcode;
 695
 696         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 697
 698         dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
 699                                 target->max_ti_iu_len, DMA_FROM_DEVICE);
 700
 701         opcode = *(u8 *) iu->buf;
 702
 703         if (0) {
 704                 int i;
 705
 706                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 707
 708                 for (i = 0; i < wc->byte_len; ++i) {
 709                         if (i % 8 == 0)
 710                                 printk(KERN_ERR "  [%02x] ", i);
 711                         printk(" %02x", ((u8 *) iu->buf)[i]);
 712                         if ((i + 1) % 8 == 0)
 713                                 printk("\n");
 714                 }
 715
 716                 if (wc->byte_len % 8)
 717                         printk("\n");
 718         }
 719
 720         switch (opcode) {
 721         case SRP_RSP:
 722                 srp_process_rsp(target, iu->buf);
 723                 break;
 724
 725         case SRP_T_LOGOUT:
 726                 /* XXX Handle target logout */
 727                 printk(KERN_WARNING PFX "Got target logout request\n");
 728                 break;
 729
 730         default:
 731                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 732                 break;
 733         }
 734
 735         dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
 736                                    target->max_ti_iu_len, DMA_FROM_DEVICE);
 737 }
 738
 739 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 740 {
 741         struct srp_target_port *target = target_ptr;
 742         struct ib_wc wc;
 743         unsigned long flags;
 744
 745         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 746         while (ib_poll_cq(cq, 1, &wc) > 0) {
 747                 if (wc.status) {
 748                         printk(KERN_ERR PFX "failed %s status %d\n",
 749                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 750                                wc.status);
 751                         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 752                         if (target->state == SRP_TARGET_LIVE)
 753                                 schedule_work(&target->work);
 754                         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 755                         break;
 756                 }
 757
 758                 if (wc.wr_id & SRP_OP_RECV)
 759                         srp_handle_recv(target, &wc);
 760                 else
 761                         ++target->tx_tail;
 762         }
 763 }
 764
 765 static int __srp_post_recv(struct srp_target_port *target)
 766 {
 767         struct srp_iu *iu;
 768         struct ib_sge list;
 769         struct ib_recv_wr wr, *bad_wr;
 770         unsigned int next;
 771         int ret;
 772
 773         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 774         wr.wr_id = next | SRP_OP_RECV;
 775         iu       = target->rx_ring[next];
 776
 777         list.addr   = iu->dma;
 778         list.length = iu->size;
 779         list.lkey   = target->srp_host->mr->lkey;
 780
 781         wr.next     = NULL;
 782         wr.sg_list  = &list;
 783         wr.num_sge  = 1;
 784
 785         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 786         if (!ret)
 787                 ++target->rx_head;
 788
 789         return ret;
 790 }
 791
 792 static int srp_post_recv(struct srp_target_port *target)
 793 {
 794         unsigned long flags;
 795         int ret;
 796
 797         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 798         ret = __srp_post_recv(target);
 799         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 800
 801         return ret;
 802 }
 803
 804 /*
 805  * Must be called with target->scsi_host->host_lock held to protect
 806  * req_lim and tx_head.  Lock cannot be dropped between call here and
 807  * call to __srp_post_send().
 808  */
 809 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 810 {
 811         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 812                 return NULL;
 813
 814         if (unlikely(target->req_lim < 1)) {
 815                 if (printk_ratelimit())
 816                         printk(KERN_DEBUG PFX "Target has req_lim %d\n",
 817                                target->req_lim);
 818                 return NULL;
 819         }
 820
 821         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 822 }
 823
 824 /*
 825  * Must be called with target->scsi_host->host_lock held to protect
 826  * req_lim and tx_head.
 827  */
 828 static int __srp_post_send(struct srp_target_port *target,
 829                            struct srp_iu *iu, int len)
 830 {
 831         struct ib_sge list;
 832         struct ib_send_wr wr, *bad_wr;
 833         int ret = 0;
 834
 835         list.addr   = iu->dma;
 836         list.length = len;
 837         list.lkey   = target->srp_host->mr->lkey;
 838
 839         wr.next       = NULL;
 840         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 841         wr.sg_list    = &list;
 842         wr.num_sge    = 1;
 843         wr.opcode     = IB_WR_SEND;
 844         wr.send_flags = IB_SEND_SIGNALED;
 845
 846         ret = ib_post_send(target->qp, &wr, &bad_wr);
 847
 848         if (!ret) {
 849                 ++target->tx_head;
 850                 --target->req_lim;
 851         }
 852
 853         return ret;
 854 }
 855
 856 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 857                             void (*done)(struct scsi_cmnd *))
 858 {
 859         struct srp_target_port *target = host_to_target(scmnd->device->host);
 860         struct srp_request *req;
 861         struct srp_iu *iu;
 862         struct srp_cmd *cmd;
 863         long req_index;
 864         int len;
 865
 866         if (target->state == SRP_TARGET_CONNECTING)
 867                 goto err;
 868
 869         if (target->state == SRP_TARGET_DEAD ||
 870             target->state == SRP_TARGET_REMOVED) {
 871                 scmnd->result = DID_BAD_TARGET << 16;
 872                 done(scmnd);
 873                 return 0;
 874         }
 875
 876         iu = __srp_get_tx_iu(target);
 877         if (!iu)
 878                 goto err;
 879
 880         dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
 881                                 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
 882
 883         req_index = target->req_head;
 884
 885         scmnd->scsi_done     = done;
 886         scmnd->result        = 0;
 887         scmnd->host_scribble = (void *) req_index;
 888
 889         cmd = iu->buf;
 890         memset(cmd, 0, sizeof *cmd);
 891
 892         cmd->opcode = SRP_CMD;
 893         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
 894         cmd->tag    = req_index;
 895         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
 896
 897         req = &target->req_ring[req_index];
 898
 899         req->scmnd    = scmnd;
 900         req->cmd      = iu;
 901         req->cmd_done = 0;
 902         req->tsk_mgmt = NULL;
 903
 904         len = srp_map_data(scmnd, target, req);
 905         if (len < 0) {
 906                 printk(KERN_ERR PFX "Failed to map data\n");
 907                 goto err;
 908         }
 909
 910         if (__srp_post_recv(target)) {
 911                 printk(KERN_ERR PFX "Recv failed\n");
 912                 goto err_unmap;
 913         }
 914
 915         dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
 916                                    SRP_MAX_IU_LEN, DMA_TO_DEVICE);
 917
 918         if (__srp_post_send(target, iu, len)) {
 919                 printk(KERN_ERR PFX "Send failed\n");
 920                 goto err_unmap;
 921         }
 922
 923         target->req_head = req->next;
 924         list_add_tail(&req->list, &target->req_queue);
 925
 926         return 0;
 927
 928 err_unmap:
 929         srp_unmap_data(scmnd, target, req);
 930
 931 err:
 932         return SCSI_MLQUEUE_HOST_BUSY;
 933 }
 934
 935 static int srp_alloc_iu_bufs(struct srp_target_port *target)
 936 {
 937         int i;
 938
 939         for (i = 0; i < SRP_RQ_SIZE; ++i) {
 940                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
 941                                                   target->max_ti_iu_len,
 942                                                   GFP_KERNEL, DMA_FROM_DEVICE);
 943                 if (!target->rx_ring[i])
 944                         goto err;
 945         }
 946
 947         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
 948                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
 949                                                   SRP_MAX_IU_LEN,
 950                                                   GFP_KERNEL, DMA_TO_DEVICE);
 951                 if (!target->tx_ring[i])
 952                         goto err;
 953         }
 954
 955         return 0;
 956
 957 err:
 958         for (i = 0; i < SRP_RQ_SIZE; ++i) {
 959                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 960                 target->rx_ring[i] = NULL;
 961         }
 962
 963         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
 964                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 965                 target->tx_ring[i] = NULL;
 966         }
 967
 968         return -ENOMEM;
 969 }
 970
 971 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
 972                                struct ib_cm_event *event,
 973                                struct srp_target_port *target)
 974 {
 975         struct ib_class_port_info *cpi;
 976         int opcode;
 977
 978         switch (event->param.rej_rcvd.reason) {
 979         case IB_CM_REJ_PORT_CM_REDIRECT:
 980                 cpi = event->param.rej_rcvd.ari;
 981                 target->path.dlid = cpi->redirect_lid;
 982                 target->path.pkey = cpi->redirect_pkey;
 983                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
 984                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
 985
 986                 target->status = target->path.dlid ?
 987                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
 988                 break;
 989
 990         case IB_CM_REJ_PORT_REDIRECT:
 991                 if (topspin_workarounds &&
 992                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 993                         /*
 994                          * Topspin/Cisco SRP gateways incorrectly send
 995                          * reject reason code 25 when they mean 24
 996                          * (port redirect).
 997                          */
 998                         memcpy(target->path.dgid.raw,
 999                                event->param.rej_rcvd.ari, 16);
1000
1001                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1002                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1003                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1004
1005                         target->status = SRP_PORT_REDIRECT;
1006                 } else {
1007                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1008                         target->status = -ECONNRESET;
1009                 }
1010                 break;
1011
1012         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1013                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1014                 target->status = -ECONNRESET;
1015                 break;
1016
1017         case IB_CM_REJ_CONSUMER_DEFINED:
1018                 opcode = *(u8 *) event->private_data;
1019                 if (opcode == SRP_LOGIN_REJ) {
1020                         struct srp_login_rej *rej = event->private_data;
1021                         u32 reason = be32_to_cpu(rej->reason);
1022
1023                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1024                                 printk(KERN_WARNING PFX
1025                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1026                         else
1027                                 printk(KERN_WARNING PFX
1028                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1029                 } else
1030                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1031                                " opcode 0x%02x\n", opcode);
1032                 target->status = -ECONNRESET;
1033                 break;
1034
1035         default:
1036                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1037                        event->param.rej_rcvd.reason);
1038                 target->status = -ECONNRESET;
1039         }
1040 }
1041
1042 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1043 {
1044         struct srp_target_port *target = cm_id->context;
1045         struct ib_qp_attr *qp_attr = NULL;
1046         int attr_mask = 0;
1047         int comp = 0;
1048         int opcode = 0;
1049
1050         switch (event->event) {
1051         case IB_CM_REQ_ERROR:
1052                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1053                 comp = 1;
1054                 target->status = -ECONNRESET;
1055                 break;
1056
1057         case IB_CM_REP_RECEIVED:
1058                 comp = 1;
1059                 opcode = *(u8 *) event->private_data;
1060
1061                 if (opcode == SRP_LOGIN_RSP) {
1062                         struct srp_login_rsp *rsp = event->private_data;
1063
1064                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1065                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1066
1067                         target->scsi_host->can_queue = min(target->req_lim,
1068                                                            target->scsi_host->can_queue);
1069                 } else {
1070                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1071                         target->status = -ECONNRESET;
1072                         break;
1073                 }
1074
1075                 target->status = srp_alloc_iu_bufs(target);
1076                 if (target->status)
1077                         break;
1078
1079                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1080                 if (!qp_attr) {
1081                         target->status = -ENOMEM;
1082                         break;
1083                 }
1084
1085                 qp_attr->qp_state = IB_QPS_RTR;
1086                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1087                 if (target->status)
1088                         break;
1089
1090                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1091                 if (target->status)
1092                         break;
1093
1094                 target->status = srp_post_recv(target);
1095                 if (target->status)
1096                         break;
1097
1098                 qp_attr->qp_state = IB_QPS_RTS;
1099                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1100                 if (target->status)
1101                         break;
1102
1103                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1104                 if (target->status)
1105                         break;
1106
1107                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1108                 if (target->status)
1109                         break;
1110
1111                 break;
1112
1113         case IB_CM_REJ_RECEIVED:
1114                 printk(KERN_DEBUG PFX "REJ received\n");
1115                 comp = 1;
1116
1117                 srp_cm_rej_handler(cm_id, event, target);
1118                 break;
1119
1120         case IB_CM_MRA_RECEIVED:
1121                 printk(KERN_ERR PFX "MRA received\n");
1122                 break;
1123
1124         case IB_CM_DREP_RECEIVED:
1125                 break;
1126
1127         case IB_CM_TIMEWAIT_EXIT:
1128                 printk(KERN_ERR PFX "connection closed\n");
1129
1130                 comp = 1;
1131                 target->status = 0;
1132                 break;
1133
1134         default:
1135                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1136                 break;
1137         }
1138
1139         if (comp)
1140                 complete(&target->done);
1141
1142         kfree(qp_attr);
1143
1144         return 0;
1145 }
1146
1147 static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1148 {
1149         struct srp_target_port *target = host_to_target(scmnd->device->host);
1150         struct srp_request *req;
1151         struct srp_iu *iu;
1152         struct srp_tsk_mgmt *tsk_mgmt;
1153         int req_index;
1154         int ret = FAILED;
1155
1156         spin_lock_irq(target->scsi_host->host_lock);
1157
1158         if (target->state == SRP_TARGET_DEAD ||
1159             target->state == SRP_TARGET_REMOVED) {
1160                 scmnd->result = DID_BAD_TARGET << 16;
1161                 goto out;
1162         }
1163
1164         if (scmnd->host_scribble == (void *) -1L)
1165                 goto out;
1166
1167         req_index = (long) scmnd->host_scribble;
1168         printk(KERN_ERR "Abort for req_index %d\n", req_index);
1169
1170         req = &target->req_ring[req_index];
1171         init_completion(&req->done);
1172
1173         iu = __srp_get_tx_iu(target);
1174         if (!iu)
1175                 goto out;
1176
1177         tsk_mgmt = iu->buf;
1178         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1179
1180         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1181         tsk_mgmt->lun           = cpu_to_be64((u64) scmnd->device->lun << 48);
1182         tsk_mgmt->tag           = req_index | SRP_TAG_TSK_MGMT;
1183         tsk_mgmt->tsk_mgmt_func = func;
1184         tsk_mgmt->task_tag      = req_index;
1185
1186         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1187                 goto out;
1188
1189         req->tsk_mgmt = iu;
1190
1191         spin_unlock_irq(target->scsi_host->host_lock);
1192         if (!wait_for_completion_timeout(&req->done,
1193                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1194                 return FAILED;
1195         spin_lock_irq(target->scsi_host->host_lock);
1196
1197         if (req->cmd_done) {
1198                 list_del(&req->list);
1199                 req->next = target->req_head;
1200                 target->req_head = req_index;
1201
1202                 scmnd->scsi_done(scmnd);
1203         } else if (!req->tsk_status) {
1204                 scmnd->result = DID_ABORT << 16;
1205                 ret = SUCCESS;
1206         }
1207
1208 out:
1209         spin_unlock_irq(target->scsi_host->host_lock);
1210         return ret;
1211 }
1212
1213 static int srp_abort(struct scsi_cmnd *scmnd)
1214 {
1215         printk(KERN_ERR "SRP abort called\n");
1216
1217         return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1218 }
1219
1220 static int srp_reset_device(struct scsi_cmnd *scmnd)
1221 {
1222         printk(KERN_ERR "SRP reset_device called\n");
1223
1224         return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1225 }
1226
1227 static int srp_reset_host(struct scsi_cmnd *scmnd)
1228 {
1229         struct srp_target_port *target = host_to_target(scmnd->device->host);
1230         int ret = FAILED;
1231
1232         printk(KERN_ERR PFX "SRP reset_host called\n");
1233
1234         if (!srp_reconnect_target(target))
1235                 ret = SUCCESS;
1236
1237         return ret;
1238 }
1239
1240 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1241 {
1242         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1243
1244         if (target->state == SRP_TARGET_DEAD ||
1245             target->state == SRP_TARGET_REMOVED)
1246                 return -ENODEV;
1247
1248         return sprintf(buf, "0x%016llx\n",
1249                        (unsigned long long) be64_to_cpu(target->id_ext));
1250 }
1251
1252 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1253 {
1254         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1255
1256         if (target->state == SRP_TARGET_DEAD ||
1257             target->state == SRP_TARGET_REMOVED)
1258                 return -ENODEV;
1259
1260         return sprintf(buf, "0x%016llx\n",
1261                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1262 }
1263
1264 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1265 {
1266         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1267
1268         if (target->state == SRP_TARGET_DEAD ||
1269             target->state == SRP_TARGET_REMOVED)
1270                 return -ENODEV;
1271
1272         return sprintf(buf, "0x%016llx\n",
1273                        (unsigned long long) be64_to_cpu(target->service_id));
1274 }
1275
1276 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1277 {
1278         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1279
1280         if (target->state == SRP_TARGET_DEAD ||
1281             target->state == SRP_TARGET_REMOVED)
1282                 return -ENODEV;
1283
1284         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1285 }
1286
1287 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1288 {
1289         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1290
1291         if (target->state == SRP_TARGET_DEAD ||
1292             target->state == SRP_TARGET_REMOVED)
1293                 return -ENODEV;
1294
1295         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1296                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1297                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1298                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1299                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1300                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1301                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1302                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1303                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1304 }
1305
1306 static CLASS_DEVICE_ATTR(id_ext,        S_IRUGO, show_id_ext,           NULL);
1307 static CLASS_DEVICE_ATTR(ioc_guid,      S_IRUGO, show_ioc_guid,         NULL);
1308 static CLASS_DEVICE_ATTR(service_id,    S_IRUGO, show_service_id,       NULL);
1309 static CLASS_DEVICE_ATTR(pkey,          S_IRUGO, show_pkey,             NULL);
1310 static CLASS_DEVICE_ATTR(dgid,          S_IRUGO, show_dgid,             NULL);
1311
1312 static struct class_device_attribute *srp_host_attrs[] = {
1313         &class_device_attr_id_ext,
1314         &class_device_attr_ioc_guid,
1315         &class_device_attr_service_id,
1316         &class_device_attr_pkey,
1317         &class_device_attr_dgid,
1318         NULL
1319 };
1320
1321 static struct scsi_host_template srp_template = {
1322         .module                         = THIS_MODULE,
1323         .name                           = DRV_NAME,
1324         .info                           = srp_target_info,
1325         .queuecommand                   = srp_queuecommand,
1326         .eh_abort_handler               = srp_abort,
1327         .eh_device_reset_handler        = srp_reset_device,
1328         .eh_host_reset_handler          = srp_reset_host,
1329         .can_queue                      = SRP_SQ_SIZE,
1330         .this_id                        = -1,
1331         .sg_tablesize                   = SRP_MAX_INDIRECT,
1332         .cmd_per_lun                    = SRP_SQ_SIZE,
1333         .use_clustering                 = ENABLE_CLUSTERING,
1334         .shost_attrs                    = srp_host_attrs
1335 };
1336
1337 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1338 {
1339         sprintf(target->target_name, "SRP.T10:%016llX",
1340                  (unsigned long long) be64_to_cpu(target->id_ext));
1341
1342         if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1343                 return -ENODEV;
1344
1345         mutex_lock(&host->target_mutex);
1346         list_add_tail(&target->list, &host->target_list);
1347         mutex_unlock(&host->target_mutex);
1348
1349         target->state = SRP_TARGET_LIVE;
1350
1351         /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1352         scsi_scan_target(&target->scsi_host->shost_gendev,
1353                          0, target->scsi_id, ~0, 0);
1354
1355         return 0;
1356 }
1357
1358 static void srp_release_class_dev(struct class_device *class_dev)
1359 {
1360         struct srp_host *host =
1361                 container_of(class_dev, struct srp_host, class_dev);
1362
1363         complete(&host->released);
1364 }
1365
1366 static struct class srp_class = {
1367         .name    = "infiniband_srp",
1368         .release = srp_release_class_dev
1369 };
1370
1371 /*
1372  * Target ports are added by writing
1373  *
1374  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1375  *     pkey=<P_Key>,service_id=<service ID>
1376  *
1377  * to the add_target sysfs attribute.
1378  */
1379 enum {
1380         SRP_OPT_ERR             = 0,
1381         SRP_OPT_ID_EXT          = 1 << 0,
1382         SRP_OPT_IOC_GUID        = 1 << 1,
1383         SRP_OPT_DGID            = 1 << 2,
1384         SRP_OPT_PKEY            = 1 << 3,
1385         SRP_OPT_SERVICE_ID      = 1 << 4,
1386         SRP_OPT_MAX_SECT        = 1 << 5,
1387         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1388                                    SRP_OPT_IOC_GUID     |
1389                                    SRP_OPT_DGID         |
1390                                    SRP_OPT_PKEY         |
1391                                    SRP_OPT_SERVICE_ID),
1392 };
1393
1394 static match_table_t srp_opt_tokens = {
1395         { SRP_OPT_ID_EXT,       "id_ext=%s"     },
1396         { SRP_OPT_IOC_GUID,     "ioc_guid=%s"   },
1397         { SRP_OPT_DGID,         "dgid=%s"       },
1398         { SRP_OPT_PKEY,         "pkey=%x"       },
1399         { SRP_OPT_SERVICE_ID,   "service_id=%s" },
1400         { SRP_OPT_MAX_SECT,     "max_sect=%d"   },
1401         { SRP_OPT_ERR,          NULL            }
1402 };
1403
1404 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1405 {
1406         char *options, *sep_opt;
1407         char *p;
1408         char dgid[3];
1409         substring_t args[MAX_OPT_ARGS];
1410         int opt_mask = 0;
1411         int token;
1412         int ret = -EINVAL;
1413         int i;
1414
1415         options = kstrdup(buf, GFP_KERNEL);
1416         if (!options)
1417                 return -ENOMEM;
1418
1419         sep_opt = options;
1420         while ((p = strsep(&sep_opt, ",")) != NULL) {
1421                 if (!*p)
1422                         continue;
1423
1424                 token = match_token(p, srp_opt_tokens, args);
1425                 opt_mask |= token;
1426
1427                 switch (token) {
1428                 case SRP_OPT_ID_EXT:
1429                         p = match_strdup(args);
1430                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1431                         kfree(p);
1432                         break;
1433
1434                 case SRP_OPT_IOC_GUID:
1435                         p = match_strdup(args);
1436                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1437                         kfree(p);
1438                         break;
1439
1440                 case SRP_OPT_DGID:
1441                         p = match_strdup(args);
1442                         if (strlen(p) != 32) {
1443                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1444                                 goto out;
1445                         }
1446
1447                         for (i = 0; i < 16; ++i) {
1448                                 strlcpy(dgid, p + i * 2, 3);
1449                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1450                         }
1451                         kfree(p);
1452                         break;
1453
1454                 case SRP_OPT_PKEY:
1455                         if (match_hex(args, &token)) {
1456                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1457                                 goto out;
1458                         }
1459                         target->path.pkey = cpu_to_be16(token);
1460                         break;
1461
1462                 case SRP_OPT_SERVICE_ID:
1463                         p = match_strdup(args);
1464                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1465                         kfree(p);
1466                         break;
1467
1468                 case SRP_OPT_MAX_SECT:
1469                         if (match_int(args, &token)) {
1470                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1471                                 goto out;
1472                         }
1473                         target->scsi_host->max_sectors = token;
1474                         break;
1475
1476                 default:
1477                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1478                                "'%s' in target creation request\n", p);
1479                         goto out;
1480                 }
1481         }
1482
1483         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1484                 ret = 0;
1485         else
1486                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1487                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1488                             !(srp_opt_tokens[i].token & opt_mask))
1489                                 printk(KERN_WARNING PFX "target creation request is "
1490                                        "missing parameter '%s'\n",
1491                                        srp_opt_tokens[i].pattern);
1492
1493 out:
1494         kfree(options);
1495         return ret;
1496 }
1497
1498 static ssize_t srp_create_target(struct class_device *class_dev,
1499                                  const char *buf, size_t count)
1500 {
1501         struct srp_host *host =
1502                 container_of(class_dev, struct srp_host, class_dev);
1503         struct Scsi_Host *target_host;
1504         struct srp_target_port *target;
1505         int ret;
1506         int i;
1507
1508         target_host = scsi_host_alloc(&srp_template,
1509                                       sizeof (struct srp_target_port));
1510         if (!target_host)
1511                 return -ENOMEM;
1512
1513         target_host->max_lun = SRP_MAX_LUN;
1514
1515         target = host_to_target(target_host);
1516         memset(target, 0, sizeof *target);
1517
1518         target->scsi_host  = target_host;
1519         target->srp_host   = host;
1520
1521         INIT_WORK(&target->work, srp_reconnect_work, target);
1522
1523         for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1524                 target->req_ring[i].next = i + 1;
1525         target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1526         INIT_LIST_HEAD(&target->req_queue);
1527
1528         ret = srp_parse_options(buf, target);
1529         if (ret)
1530                 goto err;
1531
1532         ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1533
1534         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1535                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1536                (unsigned long long) be64_to_cpu(target->id_ext),
1537                (unsigned long long) be64_to_cpu(target->ioc_guid),
1538                be16_to_cpu(target->path.pkey),
1539                (unsigned long long) be64_to_cpu(target->service_id),
1540                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1541                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1542                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1543                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1544                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1545                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1546                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1547                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1548
1549         ret = srp_create_target_ib(target);
1550         if (ret)
1551                 goto err;
1552
1553         target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1554         if (IS_ERR(target->cm_id)) {
1555                 ret = PTR_ERR(target->cm_id);
1556                 goto err_free;
1557         }
1558
1559         ret = srp_connect_target(target);
1560         if (ret) {
1561                 printk(KERN_ERR PFX "Connection failed\n");
1562                 goto err_cm_id;
1563         }
1564
1565         ret = srp_add_target(host, target);
1566         if (ret)
1567                 goto err_disconnect;
1568
1569         return count;
1570
1571 err_disconnect:
1572         srp_disconnect_target(target);
1573
1574 err_cm_id:
1575         ib_destroy_cm_id(target->cm_id);
1576
1577 err_free:
1578         srp_free_target_ib(target);
1579
1580 err:
1581         scsi_host_put(target_host);
1582
1583         return ret;
1584 }
1585
1586 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1587
1588 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1589 {
1590         struct srp_host *host =
1591                 container_of(class_dev, struct srp_host, class_dev);
1592
1593         return sprintf(buf, "%s\n", host->dev->name);
1594 }
1595
1596 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1597
1598 static ssize_t show_port(struct class_device *class_dev, char *buf)
1599 {
1600         struct srp_host *host =
1601                 container_of(class_dev, struct srp_host, class_dev);
1602
1603         return sprintf(buf, "%d\n", host->port);
1604 }
1605
1606 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1607
1608 static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1609 {
1610         struct srp_host *host;
1611
1612         host = kzalloc(sizeof *host, GFP_KERNEL);
1613         if (!host)
1614                 return NULL;
1615
1616         INIT_LIST_HEAD(&host->target_list);
1617         mutex_init(&host->target_mutex);
1618         init_completion(&host->released);
1619         host->dev  = device;
1620         host->port = port;
1621
1622         host->initiator_port_id[7] = port;
1623         memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1624
1625         host->pd   = ib_alloc_pd(device);
1626         if (IS_ERR(host->pd))
1627                 goto err_free;
1628
1629         host->mr   = ib_get_dma_mr(host->pd,
1630                                    IB_ACCESS_LOCAL_WRITE |
1631                                    IB_ACCESS_REMOTE_READ |
1632                                    IB_ACCESS_REMOTE_WRITE);
1633         if (IS_ERR(host->mr))
1634                 goto err_pd;
1635
1636         host->class_dev.class = &srp_class;
1637         host->class_dev.dev   = device->dma_device;
1638         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1639                  device->name, port);
1640
1641         if (class_device_register(&host->class_dev))
1642                 goto err_mr;
1643         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1644                 goto err_class;
1645         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1646                 goto err_class;
1647         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1648                 goto err_class;
1649
1650         return host;
1651
1652 err_class:
1653         class_device_unregister(&host->class_dev);
1654
1655 err_mr:
1656         ib_dereg_mr(host->mr);
1657
1658 err_pd:
1659         ib_dealloc_pd(host->pd);
1660
1661 err_free:
1662         kfree(host);
1663
1664         return NULL;
1665 }
1666
1667 static void srp_add_one(struct ib_device *device)
1668 {
1669         struct list_head *dev_list;
1670         struct srp_host *host;
1671         int s, e, p;
1672
1673         dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1674         if (!dev_list)
1675                 return;
1676
1677         INIT_LIST_HEAD(dev_list);
1678
1679         if (device->node_type == IB_NODE_SWITCH) {
1680                 s = 0;
1681                 e = 0;
1682         } else {
1683                 s = 1;
1684                 e = device->phys_port_cnt;
1685         }
1686
1687         for (p = s; p <= e; ++p) {
1688                 host = srp_add_port(device, p);
1689                 if (host)
1690                         list_add_tail(&host->list, dev_list);
1691         }
1692
1693         ib_set_client_data(device, &srp_client, dev_list);
1694 }
1695
1696 static void srp_remove_one(struct ib_device *device)
1697 {
1698         struct list_head *dev_list;
1699         struct srp_host *host, *tmp_host;
1700         LIST_HEAD(target_list);
1701         struct srp_target_port *target, *tmp_target;
1702         unsigned long flags;
1703
1704         dev_list = ib_get_client_data(device, &srp_client);
1705
1706         list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1707                 class_device_unregister(&host->class_dev);
1708                 /*
1709                  * Wait for the sysfs entry to go away, so that no new
1710                  * target ports can be created.
1711                  */
1712                 wait_for_completion(&host->released);
1713
1714                 /*
1715                  * Mark all target ports as removed, so we stop queueing
1716                  * commands and don't try to reconnect.
1717                  */
1718                 mutex_lock(&host->target_mutex);
1719                 list_for_each_entry_safe(target, tmp_target,
1720                                          &host->target_list, list) {
1721                         spin_lock_irqsave(target->scsi_host->host_lock, flags);
1722                         if (target->state != SRP_TARGET_REMOVED)
1723                                 target->state = SRP_TARGET_REMOVED;
1724                         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1725                 }
1726                 mutex_unlock(&host->target_mutex);
1727
1728                 /*
1729                  * Wait for any reconnection tasks that may have
1730                  * started before we marked our target ports as
1731                  * removed, and any target port removal tasks.
1732                  */
1733                 flush_scheduled_work();
1734
1735                 list_for_each_entry_safe(target, tmp_target,
1736                                          &host->target_list, list) {
1737                         scsi_remove_host(target->scsi_host);
1738                         srp_disconnect_target(target);
1739                         ib_destroy_cm_id(target->cm_id);
1740                         srp_free_target_ib(target);
1741                         scsi_host_put(target->scsi_host);
1742                 }
1743
1744                 ib_dereg_mr(host->mr);
1745                 ib_dealloc_pd(host->pd);
1746                 kfree(host);
1747         }
1748
1749         kfree(dev_list);
1750 }
1751
1752 static int __init srp_init_module(void)
1753 {
1754         int ret;
1755
1756         ret = class_register(&srp_class);
1757         if (ret) {
1758                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1759                 return ret;
1760         }
1761
1762         ret = ib_register_client(&srp_client);
1763         if (ret) {
1764                 printk(KERN_ERR PFX "couldn't register IB client\n");
1765                 class_unregister(&srp_class);
1766                 return ret;
1767         }
1768
1769         return 0;
1770 }
1771
1772 static void __exit srp_cleanup_module(void)
1773 {
1774         ib_unregister_client(&srp_client);
1775         class_unregister(&srp_class);
1776 }
1777
1778 module_init(srp_init_module);
1779 module_exit(srp_cleanup_module);