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   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 srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
  66 static int srp_max_iu_len;
  67
  68 module_param(srp_sg_tablesize, int, 0444);
  69 MODULE_PARM_DESC(srp_sg_tablesize,
  70                  "Max number of gather/scatter entries per I/O (default is 12)");
  71
  72 static int topspin_workarounds = 1;
  73
  74 module_param(topspin_workarounds, int, 0444);
  75 MODULE_PARM_DESC(topspin_workarounds,
  76                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  77
  78 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
  79
  80 static void srp_add_one(struct ib_device *device);
  81 static void srp_remove_one(struct ib_device *device);
  82 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  83 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  84
  85 static struct ib_client srp_client = {
  86         .name   = "srp",
  87         .add    = srp_add_one,
  88         .remove = srp_remove_one
  89 };
  90
  91 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
  92 {
  93         return (struct srp_target_port *) host->hostdata;
  94 }
  95
  96 static const char *srp_target_info(struct Scsi_Host *host)
  97 {
  98         return host_to_target(host)->target_name;
  99 }
 100
 101 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 102                                    gfp_t gfp_mask,
 103                                    enum dma_data_direction direction)
 104 {
 105         struct srp_iu *iu;
 106
 107         iu = kmalloc(sizeof *iu, gfp_mask);
 108         if (!iu)
 109                 goto out;
 110
 111         iu->buf = kzalloc(size, gfp_mask);
 112         if (!iu->buf)
 113                 goto out_free_iu;
 114
 115         iu->dma = dma_map_single(host->dev->dev->dma_device,
 116                                  iu->buf, size, direction);
 117         if (dma_mapping_error(iu->dma))
 118                 goto out_free_buf;
 119
 120         iu->size      = size;
 121         iu->direction = direction;
 122
 123         return iu;
 124
 125 out_free_buf:
 126         kfree(iu->buf);
 127 out_free_iu:
 128         kfree(iu);
 129 out:
 130         return NULL;
 131 }
 132
 133 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 134 {
 135         if (!iu)
 136                 return;
 137
 138         dma_unmap_single(host->dev->dev->dma_device,
 139                          iu->dma, iu->size, iu->direction);
 140         kfree(iu->buf);
 141         kfree(iu);
 142 }
 143
 144 static void srp_qp_event(struct ib_event *event, void *context)
 145 {
 146         printk(KERN_ERR PFX "QP event %d\n", event->event);
 147 }
 148
 149 static int srp_init_qp(struct srp_target_port *target,
 150                        struct ib_qp *qp)
 151 {
 152         struct ib_qp_attr *attr;
 153         int ret;
 154
 155         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 156         if (!attr)
 157                 return -ENOMEM;
 158
 159         ret = ib_find_cached_pkey(target->srp_host->dev->dev,
 160                                   target->srp_host->port,
 161                                   be16_to_cpu(target->path.pkey),
 162                                   &attr->pkey_index);
 163         if (ret)
 164                 goto out;
 165
 166         attr->qp_state        = IB_QPS_INIT;
 167         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 168                                     IB_ACCESS_REMOTE_WRITE);
 169         attr->port_num        = target->srp_host->port;
 170
 171         ret = ib_modify_qp(qp, attr,
 172                            IB_QP_STATE          |
 173                            IB_QP_PKEY_INDEX     |
 174                            IB_QP_ACCESS_FLAGS   |
 175                            IB_QP_PORT);
 176
 177 out:
 178         kfree(attr);
 179         return ret;
 180 }
 181
 182 static int srp_create_target_ib(struct srp_target_port *target)
 183 {
 184         struct ib_qp_init_attr *init_attr;
 185         int ret;
 186
 187         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 188         if (!init_attr)
 189                 return -ENOMEM;
 190
 191         target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
 192                                   NULL, target, SRP_CQ_SIZE);
 193         if (IS_ERR(target->cq)) {
 194                 ret = PTR_ERR(target->cq);
 195                 goto out;
 196         }
 197
 198         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 199
 200         init_attr->event_handler       = srp_qp_event;
 201         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 202         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 203         init_attr->cap.max_recv_sge    = 1;
 204         init_attr->cap.max_send_sge    = 1;
 205         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 206         init_attr->qp_type             = IB_QPT_RC;
 207         init_attr->send_cq             = target->cq;
 208         init_attr->recv_cq             = target->cq;
 209
 210         target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
 211         if (IS_ERR(target->qp)) {
 212                 ret = PTR_ERR(target->qp);
 213                 ib_destroy_cq(target->cq);
 214                 goto out;
 215         }
 216
 217         ret = srp_init_qp(target, target->qp);
 218         if (ret) {
 219                 ib_destroy_qp(target->qp);
 220                 ib_destroy_cq(target->cq);
 221                 goto out;
 222         }
 223
 224 out:
 225         kfree(init_attr);
 226         return ret;
 227 }
 228
 229 static void srp_free_target_ib(struct srp_target_port *target)
 230 {
 231         int i;
 232
 233         ib_destroy_qp(target->qp);
 234         ib_destroy_cq(target->cq);
 235
 236         for (i = 0; i < SRP_RQ_SIZE; ++i)
 237                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 238         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 239                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 240 }
 241
 242 static void srp_path_rec_completion(int status,
 243                                     struct ib_sa_path_rec *pathrec,
 244                                     void *target_ptr)
 245 {
 246         struct srp_target_port *target = target_ptr;
 247
 248         target->status = status;
 249         if (status)
 250                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
 251         else
 252                 target->path = *pathrec;
 253         complete(&target->done);
 254 }
 255
 256 static int srp_lookup_path(struct srp_target_port *target)
 257 {
 258         target->path.numb_path = 1;
 259
 260         init_completion(&target->done);
 261
 262         target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
 263                                                    target->srp_host->port,
 264                                                    &target->path,
 265                                                    IB_SA_PATH_REC_DGID          |
 266                                                    IB_SA_PATH_REC_SGID          |
 267                                                    IB_SA_PATH_REC_NUMB_PATH     |
 268                                                    IB_SA_PATH_REC_PKEY,
 269                                                    SRP_PATH_REC_TIMEOUT_MS,
 270                                                    GFP_KERNEL,
 271                                                    srp_path_rec_completion,
 272                                                    target, &target->path_query);
 273         if (target->path_query_id < 0)
 274                 return target->path_query_id;
 275
 276         wait_for_completion(&target->done);
 277
 278         if (target->status < 0)
 279                 printk(KERN_WARNING PFX "Path record query failed\n");
 280
 281         return target->status;
 282 }
 283
 284 static int srp_send_req(struct srp_target_port *target)
 285 {
 286         struct {
 287                 struct ib_cm_req_param param;
 288                 struct srp_login_req   priv;
 289         } *req = NULL;
 290         int status;
 291
 292         req = kzalloc(sizeof *req, GFP_KERNEL);
 293         if (!req)
 294                 return -ENOMEM;
 295
 296         req->param.primary_path               = &target->path;
 297         req->param.alternate_path             = NULL;
 298         req->param.service_id                 = target->service_id;
 299         req->param.qp_num                     = target->qp->qp_num;
 300         req->param.qp_type                    = target->qp->qp_type;
 301         req->param.private_data               = &req->priv;
 302         req->param.private_data_len           = sizeof req->priv;
 303         req->param.flow_control               = 1;
 304
 305         get_random_bytes(&req->param.starting_psn, 4);
 306         req->param.starting_psn              &= 0xffffff;
 307
 308         /*
 309          * Pick some arbitrary defaults here; we could make these
 310          * module parameters if anyone cared about setting them.
 311          */
 312         req->param.responder_resources        = 4;
 313         req->param.remote_cm_response_timeout = 20;
 314         req->param.local_cm_response_timeout  = 20;
 315         req->param.retry_count                = 7;
 316         req->param.rnr_retry_count            = 7;
 317         req->param.max_cm_retries             = 15;
 318
 319         req->priv.opcode        = SRP_LOGIN_REQ;
 320         req->priv.tag           = 0;
 321         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 322         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 323                                               SRP_BUF_FORMAT_INDIRECT);
 324         /*
 325          * In the published SRP specification (draft rev. 16a), the
 326          * port identifier format is 8 bytes of ID extension followed
 327          * by 8 bytes of GUID.  Older drafts put the two halves in the
 328          * opposite order, so that the GUID comes first.
 329          *
 330          * Targets conforming to these obsolete drafts can be
 331          * recognized by the I/O Class they report.
 332          */
 333         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 334                 memcpy(req->priv.initiator_port_id,
 335                        target->srp_host->initiator_port_id + 8, 8);
 336                 memcpy(req->priv.initiator_port_id + 8,
 337                        target->srp_host->initiator_port_id, 8);
 338                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 339                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 340         } else {
 341                 memcpy(req->priv.initiator_port_id,
 342                        target->srp_host->initiator_port_id, 16);
 343                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 344                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 345         }
 346
 347         /*
 348          * Topspin/Cisco SRP targets will reject our login unless we
 349          * zero out the first 8 bytes of our initiator port ID.  The
 350          * second 8 bytes must be our local node GUID, but we always
 351          * use that anyway.
 352          */
 353         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 354                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 355                        "activated for target GUID %016llx\n",
 356                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 357                 memset(req->priv.initiator_port_id, 0, 8);
 358         }
 359
 360         status = ib_send_cm_req(target->cm_id, &req->param);
 361
 362         kfree(req);
 363
 364         return status;
 365 }
 366
 367 static void srp_disconnect_target(struct srp_target_port *target)
 368 {
 369         /* XXX should send SRP_I_LOGOUT request */
 370
 371         init_completion(&target->done);
 372         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 373                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 374                 return;
 375         }
 376         wait_for_completion(&target->done);
 377 }
 378
 379 static void srp_remove_work(void *target_ptr)
 380 {
 381         struct srp_target_port *target = target_ptr;
 382
 383         spin_lock_irq(target->scsi_host->host_lock);
 384         if (target->state != SRP_TARGET_DEAD) {
 385                 spin_unlock_irq(target->scsi_host->host_lock);
 386                 return;
 387         }
 388         target->state = SRP_TARGET_REMOVED;
 389         spin_unlock_irq(target->scsi_host->host_lock);
 390
 391         spin_lock(&target->srp_host->target_lock);
 392         list_del(&target->list);
 393         spin_unlock(&target->srp_host->target_lock);
 394
 395         scsi_remove_host(target->scsi_host);
 396         ib_destroy_cm_id(target->cm_id);
 397         srp_free_target_ib(target);
 398         scsi_host_put(target->scsi_host);
 399 }
 400
 401 static int srp_connect_target(struct srp_target_port *target)
 402 {
 403         int ret;
 404
 405         ret = srp_lookup_path(target);
 406         if (ret)
 407                 return ret;
 408
 409         while (1) {
 410                 init_completion(&target->done);
 411                 ret = srp_send_req(target);
 412                 if (ret)
 413                         return ret;
 414                 wait_for_completion(&target->done);
 415
 416                 /*
 417                  * The CM event handling code will set status to
 418                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 419                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 420                  * redirect REJ back.
 421                  */
 422                 switch (target->status) {
 423                 case 0:
 424                         return 0;
 425
 426                 case SRP_PORT_REDIRECT:
 427                         ret = srp_lookup_path(target);
 428                         if (ret)
 429                                 return ret;
 430                         break;
 431
 432                 case SRP_DLID_REDIRECT:
 433                         break;
 434
 435                 default:
 436                         return target->status;
 437                 }
 438         }
 439 }
 440
 441 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 442                            struct srp_target_port *target,
 443                            struct srp_request *req)
 444 {
 445         struct scatterlist *scat;
 446         int nents;
 447
 448         if (!scmnd->request_buffer ||
 449             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 450              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 451                 return;
 452
 453         if (req->fmr) {
 454                 ib_fmr_pool_unmap(req->fmr);
 455                 req->fmr = NULL;
 456         }
 457
 458         /*
 459          * This handling of non-SG commands can be killed when the
 460          * SCSI midlayer no longer generates non-SG commands.
 461          */
 462         if (likely(scmnd->use_sg)) {
 463                 nents = scmnd->use_sg;
 464                 scat  = scmnd->request_buffer;
 465         } else {
 466                 nents = 1;
 467                 scat  = &req->fake_sg;
 468         }
 469
 470         dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
 471                      scmnd->sc_data_direction);
 472 }
 473
 474 static int srp_reconnect_target(struct srp_target_port *target)
 475 {
 476         struct ib_cm_id *new_cm_id;
 477         struct ib_qp_attr qp_attr;
 478         struct srp_request *req;
 479         struct ib_wc wc;
 480         int ret;
 481         int i;
 482
 483         spin_lock_irq(target->scsi_host->host_lock);
 484         if (target->state != SRP_TARGET_LIVE) {
 485                 spin_unlock_irq(target->scsi_host->host_lock);
 486                 return -EAGAIN;
 487         }
 488         target->state = SRP_TARGET_CONNECTING;
 489         spin_unlock_irq(target->scsi_host->host_lock);
 490
 491         srp_disconnect_target(target);
 492         /*
 493          * Now get a new local CM ID so that we avoid confusing the
 494          * target in case things are really fouled up.
 495          */
 496         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 497                                     srp_cm_handler, target);
 498         if (IS_ERR(new_cm_id)) {
 499                 ret = PTR_ERR(new_cm_id);
 500                 goto err;
 501         }
 502         ib_destroy_cm_id(target->cm_id);
 503         target->cm_id = new_cm_id;
 504
 505         qp_attr.qp_state = IB_QPS_RESET;
 506         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 507         if (ret)
 508                 goto err;
 509
 510         ret = srp_init_qp(target, target->qp);
 511         if (ret)
 512                 goto err;
 513
 514         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 515                 ; /* nothing */
 516
 517         list_for_each_entry(req, &target->req_queue, list) {
 518                 req->scmnd->result = DID_RESET << 16;
 519                 req->scmnd->scsi_done(req->scmnd);
 520                 srp_unmap_data(req->scmnd, target, req);
 521         }
 522
 523         target->rx_head  = 0;
 524         target->tx_head  = 0;
 525         target->tx_tail  = 0;
 526         INIT_LIST_HEAD(&target->free_reqs);
 527         INIT_LIST_HEAD(&target->req_queue);
 528         for (i = 0; i < SRP_SQ_SIZE; ++i)
 529                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
 530
 531         ret = srp_connect_target(target);
 532         if (ret)
 533                 goto err;
 534
 535         spin_lock_irq(target->scsi_host->host_lock);
 536         if (target->state == SRP_TARGET_CONNECTING) {
 537                 ret = 0;
 538                 target->state = SRP_TARGET_LIVE;
 539         } else
 540                 ret = -EAGAIN;
 541         spin_unlock_irq(target->scsi_host->host_lock);
 542
 543         return ret;
 544
 545 err:
 546         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 547
 548         /*
 549          * We couldn't reconnect, so kill our target port off.
 550          * However, we have to defer the real removal because we might
 551          * be in the context of the SCSI error handler now, which
 552          * would deadlock if we call scsi_remove_host().
 553          */
 554         spin_lock_irq(target->scsi_host->host_lock);
 555         if (target->state == SRP_TARGET_CONNECTING) {
 556                 target->state = SRP_TARGET_DEAD;
 557                 INIT_WORK(&target->work, srp_remove_work, target);
 558                 schedule_work(&target->work);
 559         }
 560         spin_unlock_irq(target->scsi_host->host_lock);
 561
 562         return ret;
 563 }
 564
 565 static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
 566                        int sg_cnt, struct srp_request *req,
 567                        struct srp_direct_buf *buf)
 568 {
 569         u64 io_addr = 0;
 570         u64 *dma_pages;
 571         u32 len;
 572         int page_cnt;
 573         int i, j;
 574         int ret;
 575
 576         if (!dev->fmr_pool)
 577                 return -ENODEV;
 578
 579         len = page_cnt = 0;
 580         for (i = 0; i < sg_cnt; ++i) {
 581                 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
 582                         if (i > 0)
 583                                 return -EINVAL;
 584                         else
 585                                 ++page_cnt;
 586                 }
 587                 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
 588                     ~dev->fmr_page_mask) {
 589                         if (i < sg_cnt - 1)
 590                                 return -EINVAL;
 591                         else
 592                                 ++page_cnt;
 593                 }
 594
 595                 len += sg_dma_len(&scat[i]);
 596         }
 597
 598         page_cnt += len >> dev->fmr_page_shift;
 599         if (page_cnt > SRP_FMR_SIZE)
 600                 return -ENOMEM;
 601
 602         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 603         if (!dma_pages)
 604                 return -ENOMEM;
 605
 606         page_cnt = 0;
 607         for (i = 0; i < sg_cnt; ++i)
 608                 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
 609                         dma_pages[page_cnt++] =
 610                                 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
 611
 612         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 613                                         dma_pages, page_cnt, &io_addr);
 614         if (IS_ERR(req->fmr)) {
 615                 ret = PTR_ERR(req->fmr);
 616                 goto out;
 617         }
 618
 619         buf->va  = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
 620         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 621         buf->len = cpu_to_be32(len);
 622
 623         ret = 0;
 624
 625 out:
 626         kfree(dma_pages);
 627
 628         return ret;
 629 }
 630
 631 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 632                         struct srp_request *req)
 633 {
 634         struct scatterlist *scat;
 635         struct srp_cmd *cmd = req->cmd->buf;
 636         int len, nents, count;
 637         u8 fmt = SRP_DATA_DESC_DIRECT;
 638
 639         if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
 640                 return sizeof (struct srp_cmd);
 641
 642         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 643             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 644                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 645                        scmnd->sc_data_direction);
 646                 return -EINVAL;
 647         }
 648
 649         /*
 650          * This handling of non-SG commands can be killed when the
 651          * SCSI midlayer no longer generates non-SG commands.
 652          */
 653         if (likely(scmnd->use_sg)) {
 654                 nents = scmnd->use_sg;
 655                 scat  = scmnd->request_buffer;
 656         } else {
 657                 nents = 1;
 658                 scat  = &req->fake_sg;
 659                 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
 660         }
 661
 662         count = dma_map_sg(target->srp_host->dev->dev->dma_device,
 663                            scat, nents, scmnd->sc_data_direction);
 664
 665         fmt = SRP_DATA_DESC_DIRECT;
 666         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 667
 668         if (count == 1) {
 669                 /*
 670                  * The midlayer only generated a single gather/scatter
 671                  * entry, or DMA mapping coalesced everything to a
 672                  * single entry.  So a direct descriptor along with
 673                  * the DMA MR suffices.
 674                  */
 675                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 676
 677                 buf->va  = cpu_to_be64(sg_dma_address(scat));
 678                 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
 679                 buf->len = cpu_to_be32(sg_dma_len(scat));
 680         } else if (srp_map_fmr(target->srp_host->dev, scat, count, req,
 681                                (void *) cmd->add_data)) {
 682                 /*
 683                  * FMR mapping failed, and the scatterlist has more
 684                  * than one entry.  Generate an indirect memory
 685                  * descriptor.
 686                  */
 687                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 688                 u32 datalen = 0;
 689                 int i;
 690
 691                 fmt = SRP_DATA_DESC_INDIRECT;
 692                 len = sizeof (struct srp_cmd) +
 693                         sizeof (struct srp_indirect_buf) +
 694                         count * sizeof (struct srp_direct_buf);
 695
 696                 for (i = 0; i < count; ++i) {
 697                         buf->desc_list[i].va  =
 698                                 cpu_to_be64(sg_dma_address(&scat[i]));
 699                         buf->desc_list[i].key =
 700                                 cpu_to_be32(target->srp_host->dev->mr->rkey);
 701                         buf->desc_list[i].len =
 702                                 cpu_to_be32(sg_dma_len(&scat[i]));
 703                         datalen += sg_dma_len(&scat[i]);
 704                 }
 705
 706                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 707                         cmd->data_out_desc_cnt = count;
 708                 else
 709                         cmd->data_in_desc_cnt = count;
 710
 711                 buf->table_desc.va  =
 712                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 713                 buf->table_desc.key =
 714                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 715                 buf->table_desc.len =
 716                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 717
 718                 buf->len = cpu_to_be32(datalen);
 719         }
 720
 721         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 722                 cmd->buf_fmt = fmt << 4;
 723         else
 724                 cmd->buf_fmt = fmt;
 725
 726         return len;
 727 }
 728
 729 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 730 {
 731         srp_unmap_data(req->scmnd, target, req);
 732         list_move_tail(&req->list, &target->free_reqs);
 733 }
 734
 735 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 736 {
 737         struct srp_request *req;
 738         struct scsi_cmnd *scmnd;
 739         unsigned long flags;
 740         s32 delta;
 741
 742         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 743
 744         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 745
 746         target->req_lim += delta;
 747
 748         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 749
 750         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 751                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 752                         req->tsk_status = -1;
 753                 else
 754                         req->tsk_status = rsp->data[3];
 755                 complete(&req->done);
 756         } else {
 757                 scmnd = req->scmnd;
 758                 if (!scmnd)
 759                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 760                                (unsigned long long) rsp->tag);
 761                 scmnd->result = rsp->status;
 762
 763                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 764                         memcpy(scmnd->sense_buffer, rsp->data +
 765                                be32_to_cpu(rsp->resp_data_len),
 766                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 767                                      SCSI_SENSE_BUFFERSIZE));
 768                 }
 769
 770                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 771                         scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
 772                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 773                         scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
 774
 775                 if (!req->tsk_mgmt) {
 776                         scmnd->host_scribble = (void *) -1L;
 777                         scmnd->scsi_done(scmnd);
 778
 779                         srp_remove_req(target, req);
 780                 } else
 781                         req->cmd_done = 1;
 782         }
 783
 784         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 785 }
 786
 787 static void srp_reconnect_work(void *target_ptr)
 788 {
 789         struct srp_target_port *target = target_ptr;
 790
 791         srp_reconnect_target(target);
 792 }
 793
 794 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 795 {
 796         struct srp_iu *iu;
 797         u8 opcode;
 798
 799         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 800
 801         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
 802                                 target->max_ti_iu_len, DMA_FROM_DEVICE);
 803
 804         opcode = *(u8 *) iu->buf;
 805
 806         if (0) {
 807                 int i;
 808
 809                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 810
 811                 for (i = 0; i < wc->byte_len; ++i) {
 812                         if (i % 8 == 0)
 813                                 printk(KERN_ERR "  [%02x] ", i);
 814                         printk(" %02x", ((u8 *) iu->buf)[i]);
 815                         if ((i + 1) % 8 == 0)
 816                                 printk("\n");
 817                 }
 818
 819                 if (wc->byte_len % 8)
 820                         printk("\n");
 821         }
 822
 823         switch (opcode) {
 824         case SRP_RSP:
 825                 srp_process_rsp(target, iu->buf);
 826                 break;
 827
 828         case SRP_T_LOGOUT:
 829                 /* XXX Handle target logout */
 830                 printk(KERN_WARNING PFX "Got target logout request\n");
 831                 break;
 832
 833         default:
 834                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 835                 break;
 836         }
 837
 838         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
 839                                    target->max_ti_iu_len, DMA_FROM_DEVICE);
 840 }
 841
 842 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 843 {
 844         struct srp_target_port *target = target_ptr;
 845         struct ib_wc wc;
 846         unsigned long flags;
 847
 848         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 849         while (ib_poll_cq(cq, 1, &wc) > 0) {
 850                 if (wc.status) {
 851                         printk(KERN_ERR PFX "failed %s status %d\n",
 852                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 853                                wc.status);
 854                         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 855                         if (target->state == SRP_TARGET_LIVE)
 856                                 schedule_work(&target->work);
 857                         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 858                         break;
 859                 }
 860
 861                 if (wc.wr_id & SRP_OP_RECV)
 862                         srp_handle_recv(target, &wc);
 863                 else
 864                         ++target->tx_tail;
 865         }
 866 }
 867
 868 static int __srp_post_recv(struct srp_target_port *target)
 869 {
 870         struct srp_iu *iu;
 871         struct ib_sge list;
 872         struct ib_recv_wr wr, *bad_wr;
 873         unsigned int next;
 874         int ret;
 875
 876         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 877         wr.wr_id = next | SRP_OP_RECV;
 878         iu       = target->rx_ring[next];
 879
 880         list.addr   = iu->dma;
 881         list.length = iu->size;
 882         list.lkey   = target->srp_host->dev->mr->lkey;
 883
 884         wr.next     = NULL;
 885         wr.sg_list  = &list;
 886         wr.num_sge  = 1;
 887
 888         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 889         if (!ret)
 890                 ++target->rx_head;
 891
 892         return ret;
 893 }
 894
 895 static int srp_post_recv(struct srp_target_port *target)
 896 {
 897         unsigned long flags;
 898         int ret;
 899
 900         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 901         ret = __srp_post_recv(target);
 902         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 903
 904         return ret;
 905 }
 906
 907 /*
 908  * Must be called with target->scsi_host->host_lock held to protect
 909  * req_lim and tx_head.  Lock cannot be dropped between call here and
 910  * call to __srp_post_send().
 911  */
 912 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 913 {
 914         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 915                 return NULL;
 916
 917         if (unlikely(target->req_lim < 1))
 918                 ++target->zero_req_lim;
 919
 920         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 921 }
 922
 923 /*
 924  * Must be called with target->scsi_host->host_lock held to protect
 925  * req_lim and tx_head.
 926  */
 927 static int __srp_post_send(struct srp_target_port *target,
 928                            struct srp_iu *iu, int len)
 929 {
 930         struct ib_sge list;
 931         struct ib_send_wr wr, *bad_wr;
 932         int ret = 0;
 933
 934         list.addr   = iu->dma;
 935         list.length = len;
 936         list.lkey   = target->srp_host->dev->mr->lkey;
 937
 938         wr.next       = NULL;
 939         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 940         wr.sg_list    = &list;
 941         wr.num_sge    = 1;
 942         wr.opcode     = IB_WR_SEND;
 943         wr.send_flags = IB_SEND_SIGNALED;
 944
 945         ret = ib_post_send(target->qp, &wr, &bad_wr);
 946
 947         if (!ret) {
 948                 ++target->tx_head;
 949                 --target->req_lim;
 950         }
 951
 952         return ret;
 953 }
 954
 955 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 956                             void (*done)(struct scsi_cmnd *))
 957 {
 958         struct srp_target_port *target = host_to_target(scmnd->device->host);
 959         struct srp_request *req;
 960         struct srp_iu *iu;
 961         struct srp_cmd *cmd;
 962         int len;
 963
 964         if (target->state == SRP_TARGET_CONNECTING)
 965                 goto err;
 966
 967         if (target->state == SRP_TARGET_DEAD ||
 968             target->state == SRP_TARGET_REMOVED) {
 969                 scmnd->result = DID_BAD_TARGET << 16;
 970                 done(scmnd);
 971                 return 0;
 972         }
 973
 974         iu = __srp_get_tx_iu(target);
 975         if (!iu)
 976                 goto err;
 977
 978         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
 979                                 srp_max_iu_len, DMA_TO_DEVICE);
 980
 981         req = list_entry(target->free_reqs.next, struct srp_request, list);
 982
 983         scmnd->scsi_done     = done;
 984         scmnd->result        = 0;
 985         scmnd->host_scribble = (void *) (long) req->index;
 986
 987         cmd = iu->buf;
 988         memset(cmd, 0, sizeof *cmd);
 989
 990         cmd->opcode = SRP_CMD;
 991         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
 992         cmd->tag    = req->index;
 993         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
 994
 995         req->scmnd    = scmnd;
 996         req->cmd      = iu;
 997         req->cmd_done = 0;
 998         req->tsk_mgmt = NULL;
 999
1000         len = srp_map_data(scmnd, target, req);
1001         if (len < 0) {
1002                 printk(KERN_ERR PFX "Failed to map data\n");
1003                 goto err;
1004         }
1005
1006         if (__srp_post_recv(target)) {
1007                 printk(KERN_ERR PFX "Recv failed\n");
1008                 goto err_unmap;
1009         }
1010
1011         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
1012                                    srp_max_iu_len, DMA_TO_DEVICE);
1013
1014         if (__srp_post_send(target, iu, len)) {
1015                 printk(KERN_ERR PFX "Send failed\n");
1016                 goto err_unmap;
1017         }
1018
1019         list_move_tail(&req->list, &target->req_queue);
1020
1021         return 0;
1022
1023 err_unmap:
1024         srp_unmap_data(scmnd, target, req);
1025
1026 err:
1027         return SCSI_MLQUEUE_HOST_BUSY;
1028 }
1029
1030 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1031 {
1032         int i;
1033
1034         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1035                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1036                                                   target->max_ti_iu_len,
1037                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1038                 if (!target->rx_ring[i])
1039                         goto err;
1040         }
1041
1042         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1043                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1044                                                   srp_max_iu_len,
1045                                                   GFP_KERNEL, DMA_TO_DEVICE);
1046                 if (!target->tx_ring[i])
1047                         goto err;
1048         }
1049
1050         return 0;
1051
1052 err:
1053         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1054                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1055                 target->rx_ring[i] = NULL;
1056         }
1057
1058         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1059                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1060                 target->tx_ring[i] = NULL;
1061         }
1062
1063         return -ENOMEM;
1064 }
1065
1066 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1067                                struct ib_cm_event *event,
1068                                struct srp_target_port *target)
1069 {
1070         struct ib_class_port_info *cpi;
1071         int opcode;
1072
1073         switch (event->param.rej_rcvd.reason) {
1074         case IB_CM_REJ_PORT_CM_REDIRECT:
1075                 cpi = event->param.rej_rcvd.ari;
1076                 target->path.dlid = cpi->redirect_lid;
1077                 target->path.pkey = cpi->redirect_pkey;
1078                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1079                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1080
1081                 target->status = target->path.dlid ?
1082                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1083                 break;
1084
1085         case IB_CM_REJ_PORT_REDIRECT:
1086                 if (topspin_workarounds &&
1087                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1088                         /*
1089                          * Topspin/Cisco SRP gateways incorrectly send
1090                          * reject reason code 25 when they mean 24
1091                          * (port redirect).
1092                          */
1093                         memcpy(target->path.dgid.raw,
1094                                event->param.rej_rcvd.ari, 16);
1095
1096                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1097                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1098                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1099
1100                         target->status = SRP_PORT_REDIRECT;
1101                 } else {
1102                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1103                         target->status = -ECONNRESET;
1104                 }
1105                 break;
1106
1107         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1108                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1109                 target->status = -ECONNRESET;
1110                 break;
1111
1112         case IB_CM_REJ_CONSUMER_DEFINED:
1113                 opcode = *(u8 *) event->private_data;
1114                 if (opcode == SRP_LOGIN_REJ) {
1115                         struct srp_login_rej *rej = event->private_data;
1116                         u32 reason = be32_to_cpu(rej->reason);
1117
1118                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1119                                 printk(KERN_WARNING PFX
1120                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1121                         else
1122                                 printk(KERN_WARNING PFX
1123                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1124                 } else
1125                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1126                                " opcode 0x%02x\n", opcode);
1127                 target->status = -ECONNRESET;
1128                 break;
1129
1130         default:
1131                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1132                        event->param.rej_rcvd.reason);
1133                 target->status = -ECONNRESET;
1134         }
1135 }
1136
1137 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1138 {
1139         struct srp_target_port *target = cm_id->context;
1140         struct ib_qp_attr *qp_attr = NULL;
1141         int attr_mask = 0;
1142         int comp = 0;
1143         int opcode = 0;
1144
1145         switch (event->event) {
1146         case IB_CM_REQ_ERROR:
1147                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1148                 comp = 1;
1149                 target->status = -ECONNRESET;
1150                 break;
1151
1152         case IB_CM_REP_RECEIVED:
1153                 comp = 1;
1154                 opcode = *(u8 *) event->private_data;
1155
1156                 if (opcode == SRP_LOGIN_RSP) {
1157                         struct srp_login_rsp *rsp = event->private_data;
1158
1159                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1160                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1161
1162                         target->scsi_host->can_queue = min(target->req_lim,
1163                                                            target->scsi_host->can_queue);
1164                 } else {
1165                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1166                         target->status = -ECONNRESET;
1167                         break;
1168                 }
1169
1170                 target->status = srp_alloc_iu_bufs(target);
1171                 if (target->status)
1172                         break;
1173
1174                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1175                 if (!qp_attr) {
1176                         target->status = -ENOMEM;
1177                         break;
1178                 }
1179
1180                 qp_attr->qp_state = IB_QPS_RTR;
1181                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1182                 if (target->status)
1183                         break;
1184
1185                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1186                 if (target->status)
1187                         break;
1188
1189                 target->status = srp_post_recv(target);
1190                 if (target->status)
1191                         break;
1192
1193                 qp_attr->qp_state = IB_QPS_RTS;
1194                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1195                 if (target->status)
1196                         break;
1197
1198                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1199                 if (target->status)
1200                         break;
1201
1202                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1203                 if (target->status)
1204                         break;
1205
1206                 break;
1207
1208         case IB_CM_REJ_RECEIVED:
1209                 printk(KERN_DEBUG PFX "REJ received\n");
1210                 comp = 1;
1211
1212                 srp_cm_rej_handler(cm_id, event, target);
1213                 break;
1214
1215         case IB_CM_DREQ_RECEIVED:
1216                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1217                 if (ib_send_cm_drep(cm_id, NULL, 0))
1218                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1219                 break;
1220
1221         case IB_CM_TIMEWAIT_EXIT:
1222                 printk(KERN_ERR PFX "connection closed\n");
1223
1224                 comp = 1;
1225                 target->status = 0;
1226                 break;
1227
1228         case IB_CM_MRA_RECEIVED:
1229         case IB_CM_DREQ_ERROR:
1230         case IB_CM_DREP_RECEIVED:
1231                 break;
1232
1233         default:
1234                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1235                 break;
1236         }
1237
1238         if (comp)
1239                 complete(&target->done);
1240
1241         kfree(qp_attr);
1242
1243         return 0;
1244 }
1245
1246 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1247                              struct srp_request *req, u8 func)
1248 {
1249         struct srp_iu *iu;
1250         struct srp_tsk_mgmt *tsk_mgmt;
1251
1252         spin_lock_irq(target->scsi_host->host_lock);
1253
1254         if (target->state == SRP_TARGET_DEAD ||
1255             target->state == SRP_TARGET_REMOVED) {
1256                 req->scmnd->result = DID_BAD_TARGET << 16;
1257                 goto out;
1258         }
1259
1260         init_completion(&req->done);
1261
1262         iu = __srp_get_tx_iu(target);
1263         if (!iu)
1264                 goto out;
1265
1266         tsk_mgmt = iu->buf;
1267         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1268
1269         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1270         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1271         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1272         tsk_mgmt->tsk_mgmt_func = func;
1273         tsk_mgmt->task_tag      = req->index;
1274
1275         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1276                 goto out;
1277
1278         req->tsk_mgmt = iu;
1279
1280         spin_unlock_irq(target->scsi_host->host_lock);
1281
1282         if (!wait_for_completion_timeout(&req->done,
1283                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1284                 return -1;
1285
1286         return 0;
1287
1288 out:
1289         spin_unlock_irq(target->scsi_host->host_lock);
1290         return -1;
1291 }
1292
1293 static int srp_find_req(struct srp_target_port *target,
1294                         struct scsi_cmnd *scmnd,
1295                         struct srp_request **req)
1296 {
1297         if (scmnd->host_scribble == (void *) -1L)
1298                 return -1;
1299
1300         *req = &target->req_ring[(long) scmnd->host_scribble];
1301
1302         return 0;
1303 }
1304
1305 static int srp_abort(struct scsi_cmnd *scmnd)
1306 {
1307         struct srp_target_port *target = host_to_target(scmnd->device->host);
1308         struct srp_request *req;
1309         int ret = SUCCESS;
1310
1311         printk(KERN_ERR "SRP abort called\n");
1312
1313         if (srp_find_req(target, scmnd, &req))
1314                 return FAILED;
1315         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1316                 return FAILED;
1317
1318         spin_lock_irq(target->scsi_host->host_lock);
1319
1320         if (req->cmd_done) {
1321                 srp_remove_req(target, req);
1322                 scmnd->scsi_done(scmnd);
1323         } else if (!req->tsk_status) {
1324                 srp_remove_req(target, req);
1325                 scmnd->result = DID_ABORT << 16;
1326         } else
1327                 ret = FAILED;
1328
1329         spin_unlock_irq(target->scsi_host->host_lock);
1330
1331         return ret;
1332 }
1333
1334 static int srp_reset_device(struct scsi_cmnd *scmnd)
1335 {
1336         struct srp_target_port *target = host_to_target(scmnd->device->host);
1337         struct srp_request *req, *tmp;
1338
1339         printk(KERN_ERR "SRP reset_device called\n");
1340
1341         if (srp_find_req(target, scmnd, &req))
1342                 return FAILED;
1343         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1344                 return FAILED;
1345         if (req->tsk_status)
1346                 return FAILED;
1347
1348         spin_lock_irq(target->scsi_host->host_lock);
1349
1350         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1351                 if (req->scmnd->device == scmnd->device) {
1352                         req->scmnd->result = DID_RESET << 16;
1353                         req->scmnd->scsi_done(req->scmnd);
1354                         srp_remove_req(target, req);
1355                 }
1356
1357         spin_unlock_irq(target->scsi_host->host_lock);
1358
1359         return SUCCESS;
1360 }
1361
1362 static int srp_reset_host(struct scsi_cmnd *scmnd)
1363 {
1364         struct srp_target_port *target = host_to_target(scmnd->device->host);
1365         int ret = FAILED;
1366
1367         printk(KERN_ERR PFX "SRP reset_host called\n");
1368
1369         if (!srp_reconnect_target(target))
1370                 ret = SUCCESS;
1371
1372         return ret;
1373 }
1374
1375 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1376 {
1377         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1378
1379         if (target->state == SRP_TARGET_DEAD ||
1380             target->state == SRP_TARGET_REMOVED)
1381                 return -ENODEV;
1382
1383         return sprintf(buf, "0x%016llx\n",
1384                        (unsigned long long) be64_to_cpu(target->id_ext));
1385 }
1386
1387 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1388 {
1389         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1390
1391         if (target->state == SRP_TARGET_DEAD ||
1392             target->state == SRP_TARGET_REMOVED)
1393                 return -ENODEV;
1394
1395         return sprintf(buf, "0x%016llx\n",
1396                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1397 }
1398
1399 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1400 {
1401         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1402
1403         if (target->state == SRP_TARGET_DEAD ||
1404             target->state == SRP_TARGET_REMOVED)
1405                 return -ENODEV;
1406
1407         return sprintf(buf, "0x%016llx\n",
1408                        (unsigned long long) be64_to_cpu(target->service_id));
1409 }
1410
1411 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1412 {
1413         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1414
1415         if (target->state == SRP_TARGET_DEAD ||
1416             target->state == SRP_TARGET_REMOVED)
1417                 return -ENODEV;
1418
1419         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1420 }
1421
1422 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1423 {
1424         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1425
1426         if (target->state == SRP_TARGET_DEAD ||
1427             target->state == SRP_TARGET_REMOVED)
1428                 return -ENODEV;
1429
1430         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1431                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1432                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1433                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1434                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1435                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1436                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1437                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1438                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1439 }
1440
1441 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1442 {
1443         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1444
1445         if (target->state == SRP_TARGET_DEAD ||
1446             target->state == SRP_TARGET_REMOVED)
1447                 return -ENODEV;
1448
1449         return sprintf(buf, "%d\n", target->zero_req_lim);
1450 }
1451
1452 static CLASS_DEVICE_ATTR(id_ext,        S_IRUGO, show_id_ext,           NULL);
1453 static CLASS_DEVICE_ATTR(ioc_guid,      S_IRUGO, show_ioc_guid,         NULL);
1454 static CLASS_DEVICE_ATTR(service_id,    S_IRUGO, show_service_id,       NULL);
1455 static CLASS_DEVICE_ATTR(pkey,          S_IRUGO, show_pkey,             NULL);
1456 static CLASS_DEVICE_ATTR(dgid,          S_IRUGO, show_dgid,             NULL);
1457 static CLASS_DEVICE_ATTR(zero_req_lim,  S_IRUGO, show_zero_req_lim,     NULL);
1458
1459 static struct class_device_attribute *srp_host_attrs[] = {
1460         &class_device_attr_id_ext,
1461         &class_device_attr_ioc_guid,
1462         &class_device_attr_service_id,
1463         &class_device_attr_pkey,
1464         &class_device_attr_dgid,
1465         &class_device_attr_zero_req_lim,
1466         NULL
1467 };
1468
1469 static struct scsi_host_template srp_template = {
1470         .module                         = THIS_MODULE,
1471         .name                           = DRV_NAME,
1472         .info                           = srp_target_info,
1473         .queuecommand                   = srp_queuecommand,
1474         .eh_abort_handler               = srp_abort,
1475         .eh_device_reset_handler        = srp_reset_device,
1476         .eh_host_reset_handler          = srp_reset_host,
1477         .can_queue                      = SRP_SQ_SIZE,
1478         .this_id                        = -1,
1479         .cmd_per_lun                    = SRP_SQ_SIZE,
1480         .use_clustering                 = ENABLE_CLUSTERING,
1481         .shost_attrs                    = srp_host_attrs
1482 };
1483
1484 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1485 {
1486         sprintf(target->target_name, "SRP.T10:%016llX",
1487                  (unsigned long long) be64_to_cpu(target->id_ext));
1488
1489         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1490                 return -ENODEV;
1491
1492         spin_lock(&host->target_lock);
1493         list_add_tail(&target->list, &host->target_list);
1494         spin_unlock(&host->target_lock);
1495
1496         target->state = SRP_TARGET_LIVE;
1497
1498         scsi_scan_target(&target->scsi_host->shost_gendev,
1499                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1500
1501         return 0;
1502 }
1503
1504 static void srp_release_class_dev(struct class_device *class_dev)
1505 {
1506         struct srp_host *host =
1507                 container_of(class_dev, struct srp_host, class_dev);
1508
1509         complete(&host->released);
1510 }
1511
1512 static struct class srp_class = {
1513         .name    = "infiniband_srp",
1514         .release = srp_release_class_dev
1515 };
1516
1517 /*
1518  * Target ports are added by writing
1519  *
1520  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1521  *     pkey=<P_Key>,service_id=<service ID>
1522  *
1523  * to the add_target sysfs attribute.
1524  */
1525 enum {
1526         SRP_OPT_ERR             = 0,
1527         SRP_OPT_ID_EXT          = 1 << 0,
1528         SRP_OPT_IOC_GUID        = 1 << 1,
1529         SRP_OPT_DGID            = 1 << 2,
1530         SRP_OPT_PKEY            = 1 << 3,
1531         SRP_OPT_SERVICE_ID      = 1 << 4,
1532         SRP_OPT_MAX_SECT        = 1 << 5,
1533         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1534         SRP_OPT_IO_CLASS        = 1 << 7,
1535         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1536                                    SRP_OPT_IOC_GUID     |
1537                                    SRP_OPT_DGID         |
1538                                    SRP_OPT_PKEY         |
1539                                    SRP_OPT_SERVICE_ID),
1540 };
1541
1542 static match_table_t srp_opt_tokens = {
1543         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1544         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1545         { SRP_OPT_DGID,                 "dgid=%s"               },
1546         { SRP_OPT_PKEY,                 "pkey=%x"               },
1547         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1548         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1549         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1550         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1551         { SRP_OPT_ERR,                  NULL                    }
1552 };
1553
1554 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1555 {
1556         char *options, *sep_opt;
1557         char *p;
1558         char dgid[3];
1559         substring_t args[MAX_OPT_ARGS];
1560         int opt_mask = 0;
1561         int token;
1562         int ret = -EINVAL;
1563         int i;
1564
1565         options = kstrdup(buf, GFP_KERNEL);
1566         if (!options)
1567                 return -ENOMEM;
1568
1569         sep_opt = options;
1570         while ((p = strsep(&sep_opt, ",")) != NULL) {
1571                 if (!*p)
1572                         continue;
1573
1574                 token = match_token(p, srp_opt_tokens, args);
1575                 opt_mask |= token;
1576
1577                 switch (token) {
1578                 case SRP_OPT_ID_EXT:
1579                         p = match_strdup(args);
1580                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1581                         kfree(p);
1582                         break;
1583
1584                 case SRP_OPT_IOC_GUID:
1585                         p = match_strdup(args);
1586                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1587                         kfree(p);
1588                         break;
1589
1590                 case SRP_OPT_DGID:
1591                         p = match_strdup(args);
1592                         if (strlen(p) != 32) {
1593                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1594                                 kfree(p);
1595                                 goto out;
1596                         }
1597
1598                         for (i = 0; i < 16; ++i) {
1599                                 strlcpy(dgid, p + i * 2, 3);
1600                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1601                         }
1602                         kfree(p);
1603                         break;
1604
1605                 case SRP_OPT_PKEY:
1606                         if (match_hex(args, &token)) {
1607                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1608                                 goto out;
1609                         }
1610                         target->path.pkey = cpu_to_be16(token);
1611                         break;
1612
1613                 case SRP_OPT_SERVICE_ID:
1614                         p = match_strdup(args);
1615                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1616                         kfree(p);
1617                         break;
1618
1619                 case SRP_OPT_MAX_SECT:
1620                         if (match_int(args, &token)) {
1621                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1622                                 goto out;
1623                         }
1624                         target->scsi_host->max_sectors = token;
1625                         break;
1626
1627                 case SRP_OPT_MAX_CMD_PER_LUN:
1628                         if (match_int(args, &token)) {
1629                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1630                                 goto out;
1631                         }
1632                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1633                         break;
1634
1635                 case SRP_OPT_IO_CLASS:
1636                         if (match_hex(args, &token)) {
1637                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1638                                 goto out;
1639                         }
1640                         if (token != SRP_REV10_IB_IO_CLASS &&
1641                             token != SRP_REV16A_IB_IO_CLASS) {
1642                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1643                                        " %x specified (use %x or %x).\n",
1644                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1645                                 goto out;
1646                         }
1647                         target->io_class = token;
1648                         break;
1649
1650                 default:
1651                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1652                                "'%s' in target creation request\n", p);
1653                         goto out;
1654                 }
1655         }
1656
1657         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1658                 ret = 0;
1659         else
1660                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1661                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1662                             !(srp_opt_tokens[i].token & opt_mask))
1663                                 printk(KERN_WARNING PFX "target creation request is "
1664                                        "missing parameter '%s'\n",
1665                                        srp_opt_tokens[i].pattern);
1666
1667 out:
1668         kfree(options);
1669         return ret;
1670 }
1671
1672 static ssize_t srp_create_target(struct class_device *class_dev,
1673                                  const char *buf, size_t count)
1674 {
1675         struct srp_host *host =
1676                 container_of(class_dev, struct srp_host, class_dev);
1677         struct Scsi_Host *target_host;
1678         struct srp_target_port *target;
1679         int ret;
1680         int i;
1681
1682         target_host = scsi_host_alloc(&srp_template,
1683                                       sizeof (struct srp_target_port));
1684         if (!target_host)
1685                 return -ENOMEM;
1686
1687         target_host->max_lun = SRP_MAX_LUN;
1688
1689         target = host_to_target(target_host);
1690         memset(target, 0, sizeof *target);
1691
1692         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1693         target->scsi_host  = target_host;
1694         target->srp_host   = host;
1695
1696         INIT_WORK(&target->work, srp_reconnect_work, target);
1697
1698         INIT_LIST_HEAD(&target->free_reqs);
1699         INIT_LIST_HEAD(&target->req_queue);
1700         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1701                 target->req_ring[i].index = i;
1702                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1703         }
1704
1705         ret = srp_parse_options(buf, target);
1706         if (ret)
1707                 goto err;
1708
1709         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1710
1711         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1712                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1713                (unsigned long long) be64_to_cpu(target->id_ext),
1714                (unsigned long long) be64_to_cpu(target->ioc_guid),
1715                be16_to_cpu(target->path.pkey),
1716                (unsigned long long) be64_to_cpu(target->service_id),
1717                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1718                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1719                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1720                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1721                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1722                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1723                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1724                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1725
1726         ret = srp_create_target_ib(target);
1727         if (ret)
1728                 goto err;
1729
1730         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1731         if (IS_ERR(target->cm_id)) {
1732                 ret = PTR_ERR(target->cm_id);
1733                 goto err_free;
1734         }
1735
1736         ret = srp_connect_target(target);
1737         if (ret) {
1738                 printk(KERN_ERR PFX "Connection failed\n");
1739                 goto err_cm_id;
1740         }
1741
1742         ret = srp_add_target(host, target);
1743         if (ret)
1744                 goto err_disconnect;
1745
1746         return count;
1747
1748 err_disconnect:
1749         srp_disconnect_target(target);
1750
1751 err_cm_id:
1752         ib_destroy_cm_id(target->cm_id);
1753
1754 err_free:
1755         srp_free_target_ib(target);
1756
1757 err:
1758         scsi_host_put(target_host);
1759
1760         return ret;
1761 }
1762
1763 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1764
1765 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1766 {
1767         struct srp_host *host =
1768                 container_of(class_dev, struct srp_host, class_dev);
1769
1770         return sprintf(buf, "%s\n", host->dev->dev->name);
1771 }
1772
1773 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1774
1775 static ssize_t show_port(struct class_device *class_dev, char *buf)
1776 {
1777         struct srp_host *host =
1778                 container_of(class_dev, struct srp_host, class_dev);
1779
1780         return sprintf(buf, "%d\n", host->port);
1781 }
1782
1783 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1784
1785 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1786 {
1787         struct srp_host *host;
1788
1789         host = kzalloc(sizeof *host, GFP_KERNEL);
1790         if (!host)
1791                 return NULL;
1792
1793         INIT_LIST_HEAD(&host->target_list);
1794         spin_lock_init(&host->target_lock);
1795         init_completion(&host->released);
1796         host->dev  = device;
1797         host->port = port;
1798
1799         host->initiator_port_id[7] = port;
1800         memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1801
1802         host->class_dev.class = &srp_class;
1803         host->class_dev.dev   = device->dev->dma_device;
1804         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1805                  device->dev->name, port);
1806
1807         if (class_device_register(&host->class_dev))
1808                 goto free_host;
1809         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1810                 goto err_class;
1811         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1812                 goto err_class;
1813         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1814                 goto err_class;
1815
1816         return host;
1817
1818 err_class:
1819         class_device_unregister(&host->class_dev);
1820
1821 free_host:
1822         kfree(host);
1823
1824         return NULL;
1825 }
1826
1827 static void srp_add_one(struct ib_device *device)
1828 {
1829         struct srp_device *srp_dev;
1830         struct ib_device_attr *dev_attr;
1831         struct ib_fmr_pool_param fmr_param;
1832         struct srp_host *host;
1833         int s, e, p;
1834
1835         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1836         if (!dev_attr)
1837                 return;
1838
1839         if (ib_query_device(device, dev_attr)) {
1840                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1841                        device->name);
1842                 goto free_attr;
1843         }
1844
1845         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1846         if (!srp_dev)
1847                 goto free_attr;
1848
1849         /*
1850          * Use the smallest page size supported by the HCA, down to a
1851          * minimum of 512 bytes (which is the smallest sector that a
1852          * SCSI command will ever carry).
1853          */
1854         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1855         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1856         srp_dev->fmr_page_mask  = ~((unsigned long) srp_dev->fmr_page_size - 1);
1857
1858         INIT_LIST_HEAD(&srp_dev->dev_list);
1859
1860         srp_dev->dev = device;
1861         srp_dev->pd  = ib_alloc_pd(device);
1862         if (IS_ERR(srp_dev->pd))
1863                 goto free_dev;
1864
1865         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1866                                     IB_ACCESS_LOCAL_WRITE |
1867                                     IB_ACCESS_REMOTE_READ |
1868                                     IB_ACCESS_REMOTE_WRITE);
1869         if (IS_ERR(srp_dev->mr))
1870                 goto err_pd;
1871
1872         memset(&fmr_param, 0, sizeof fmr_param);
1873         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1874         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1875         fmr_param.cache             = 1;
1876         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1877         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1878         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1879                                        IB_ACCESS_REMOTE_WRITE |
1880                                        IB_ACCESS_REMOTE_READ);
1881
1882         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1883         if (IS_ERR(srp_dev->fmr_pool))
1884                 srp_dev->fmr_pool = NULL;
1885
1886         if (device->node_type == IB_NODE_SWITCH) {
1887                 s = 0;
1888                 e = 0;
1889         } else {
1890                 s = 1;
1891                 e = device->phys_port_cnt;
1892         }
1893
1894         for (p = s; p <= e; ++p) {
1895                 host = srp_add_port(srp_dev, p);
1896                 if (host)
1897                         list_add_tail(&host->list, &srp_dev->dev_list);
1898         }
1899
1900         ib_set_client_data(device, &srp_client, srp_dev);
1901
1902         goto free_attr;
1903
1904 err_pd:
1905         ib_dealloc_pd(srp_dev->pd);
1906
1907 free_dev:
1908         kfree(srp_dev);
1909
1910 free_attr:
1911         kfree(dev_attr);
1912 }
1913
1914 static void srp_remove_one(struct ib_device *device)
1915 {
1916         struct srp_device *srp_dev;
1917         struct srp_host *host, *tmp_host;
1918         LIST_HEAD(target_list);
1919         struct srp_target_port *target, *tmp_target;
1920
1921         srp_dev = ib_get_client_data(device, &srp_client);
1922
1923         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1924                 class_device_unregister(&host->class_dev);
1925                 /*
1926                  * Wait for the sysfs entry to go away, so that no new
1927                  * target ports can be created.
1928                  */
1929                 wait_for_completion(&host->released);
1930
1931                 /*
1932                  * Mark all target ports as removed, so we stop queueing
1933                  * commands and don't try to reconnect.
1934                  */
1935                 spin_lock(&host->target_lock);
1936                 list_for_each_entry(target, &host->target_list, list) {
1937                         spin_lock_irq(target->scsi_host->host_lock);
1938                         target->state = SRP_TARGET_REMOVED;
1939                         spin_unlock_irq(target->scsi_host->host_lock);
1940                 }
1941                 spin_unlock(&host->target_lock);
1942
1943                 /*
1944                  * Wait for any reconnection tasks that may have
1945                  * started before we marked our target ports as
1946                  * removed, and any target port removal tasks.
1947                  */
1948                 flush_scheduled_work();
1949
1950                 list_for_each_entry_safe(target, tmp_target,
1951                                          &host->target_list, list) {
1952                         scsi_remove_host(target->scsi_host);
1953                         srp_disconnect_target(target);
1954                         ib_destroy_cm_id(target->cm_id);
1955                         srp_free_target_ib(target);
1956                         scsi_host_put(target->scsi_host);
1957                 }
1958
1959                 kfree(host);
1960         }
1961
1962         if (srp_dev->fmr_pool)
1963                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1964         ib_dereg_mr(srp_dev->mr);
1965         ib_dealloc_pd(srp_dev->pd);
1966
1967         kfree(srp_dev);
1968 }
1969
1970 static int __init srp_init_module(void)
1971 {
1972         int ret;
1973
1974         srp_template.sg_tablesize = srp_sg_tablesize;
1975         srp_max_iu_len = (sizeof (struct srp_cmd) +
1976                           sizeof (struct srp_indirect_buf) +
1977                           srp_sg_tablesize * 16);
1978
1979         ret = class_register(&srp_class);
1980         if (ret) {
1981                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1982                 return ret;
1983         }
1984
1985         ret = ib_register_client(&srp_client);
1986         if (ret) {
1987                 printk(KERN_ERR PFX "couldn't register IB client\n");
1988                 class_unregister(&srp_class);
1989                 return ret;
1990         }
1991
1992         return 0;
1993 }
1994
1995 static void __exit srp_cleanup_module(void)
1996 {
1997         ib_unregister_client(&srp_client);
1998         class_unregister(&srp_class);
1999 }
2000
2001 module_init(srp_init_module);
2002 module_exit(srp_cleanup_module);