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