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 int mellanox_workarounds = 1;
  81
  82 module_param(mellanox_workarounds, int, 0444);
  83 MODULE_PARM_DESC(mellanox_workarounds,
  84                  "Enable workarounds for Mellanox SRP target bugs if != 0");
  85
  86 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
  87
  88 static void srp_add_one(struct ib_device *device);
  89 static void srp_remove_one(struct ib_device *device);
  90 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  91 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  92
  93 static struct ib_client srp_client = {
  94         .name   = "srp",
  95         .add    = srp_add_one,
  96         .remove = srp_remove_one
  97 };
  98
  99 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
 100 {
 101         return (struct srp_target_port *) host->hostdata;
 102 }
 103
 104 static const char *srp_target_info(struct Scsi_Host *host)
 105 {
 106         return host_to_target(host)->target_name;
 107 }
 108
 109 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 110                                    gfp_t gfp_mask,
 111                                    enum dma_data_direction direction)
 112 {
 113         struct srp_iu *iu;
 114
 115         iu = kmalloc(sizeof *iu, gfp_mask);
 116         if (!iu)
 117                 goto out;
 118
 119         iu->buf = kzalloc(size, gfp_mask);
 120         if (!iu->buf)
 121                 goto out_free_iu;
 122
 123         iu->dma = dma_map_single(host->dev->dev->dma_device,
 124                                  iu->buf, size, direction);
 125         if (dma_mapping_error(iu->dma))
 126                 goto out_free_buf;
 127
 128         iu->size      = size;
 129         iu->direction = direction;
 130
 131         return iu;
 132
 133 out_free_buf:
 134         kfree(iu->buf);
 135 out_free_iu:
 136         kfree(iu);
 137 out:
 138         return NULL;
 139 }
 140
 141 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 142 {
 143         if (!iu)
 144                 return;
 145
 146         dma_unmap_single(host->dev->dev->dma_device,
 147                          iu->dma, iu->size, iu->direction);
 148         kfree(iu->buf);
 149         kfree(iu);
 150 }
 151
 152 static void srp_qp_event(struct ib_event *event, void *context)
 153 {
 154         printk(KERN_ERR PFX "QP event %d\n", event->event);
 155 }
 156
 157 static int srp_init_qp(struct srp_target_port *target,
 158                        struct ib_qp *qp)
 159 {
 160         struct ib_qp_attr *attr;
 161         int ret;
 162
 163         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 164         if (!attr)
 165                 return -ENOMEM;
 166
 167         ret = ib_find_cached_pkey(target->srp_host->dev->dev,
 168                                   target->srp_host->port,
 169                                   be16_to_cpu(target->path.pkey),
 170                                   &attr->pkey_index);
 171         if (ret)
 172                 goto out;
 173
 174         attr->qp_state        = IB_QPS_INIT;
 175         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 176                                     IB_ACCESS_REMOTE_WRITE);
 177         attr->port_num        = target->srp_host->port;
 178
 179         ret = ib_modify_qp(qp, attr,
 180                            IB_QP_STATE          |
 181                            IB_QP_PKEY_INDEX     |
 182                            IB_QP_ACCESS_FLAGS   |
 183                            IB_QP_PORT);
 184
 185 out:
 186         kfree(attr);
 187         return ret;
 188 }
 189
 190 static int srp_create_target_ib(struct srp_target_port *target)
 191 {
 192         struct ib_qp_init_attr *init_attr;
 193         int ret;
 194
 195         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 196         if (!init_attr)
 197                 return -ENOMEM;
 198
 199         target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
 200                                   NULL, target, SRP_CQ_SIZE);
 201         if (IS_ERR(target->cq)) {
 202                 ret = PTR_ERR(target->cq);
 203                 goto out;
 204         }
 205
 206         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 207
 208         init_attr->event_handler       = srp_qp_event;
 209         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 210         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 211         init_attr->cap.max_recv_sge    = 1;
 212         init_attr->cap.max_send_sge    = 1;
 213         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 214         init_attr->qp_type             = IB_QPT_RC;
 215         init_attr->send_cq             = target->cq;
 216         init_attr->recv_cq             = target->cq;
 217
 218         target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
 219         if (IS_ERR(target->qp)) {
 220                 ret = PTR_ERR(target->qp);
 221                 ib_destroy_cq(target->cq);
 222                 goto out;
 223         }
 224
 225         ret = srp_init_qp(target, target->qp);
 226         if (ret) {
 227                 ib_destroy_qp(target->qp);
 228                 ib_destroy_cq(target->cq);
 229                 goto out;
 230         }
 231
 232 out:
 233         kfree(init_attr);
 234         return ret;
 235 }
 236
 237 static void srp_free_target_ib(struct srp_target_port *target)
 238 {
 239         int i;
 240
 241         ib_destroy_qp(target->qp);
 242         ib_destroy_cq(target->cq);
 243
 244         for (i = 0; i < SRP_RQ_SIZE; ++i)
 245                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 246         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 247                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 248 }
 249
 250 static void srp_path_rec_completion(int status,
 251                                     struct ib_sa_path_rec *pathrec,
 252                                     void *target_ptr)
 253 {
 254         struct srp_target_port *target = target_ptr;
 255
 256         target->status = status;
 257         if (status)
 258                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
 259         else
 260                 target->path = *pathrec;
 261         complete(&target->done);
 262 }
 263
 264 static int srp_lookup_path(struct srp_target_port *target)
 265 {
 266         target->path.numb_path = 1;
 267
 268         init_completion(&target->done);
 269
 270         target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
 271                                                    target->srp_host->port,
 272                                                    &target->path,
 273                                                    IB_SA_PATH_REC_DGID          |
 274                                                    IB_SA_PATH_REC_SGID          |
 275                                                    IB_SA_PATH_REC_NUMB_PATH     |
 276                                                    IB_SA_PATH_REC_PKEY,
 277                                                    SRP_PATH_REC_TIMEOUT_MS,
 278                                                    GFP_KERNEL,
 279                                                    srp_path_rec_completion,
 280                                                    target, &target->path_query);
 281         if (target->path_query_id < 0)
 282                 return target->path_query_id;
 283
 284         wait_for_completion(&target->done);
 285
 286         if (target->status < 0)
 287                 printk(KERN_WARNING PFX "Path record query failed\n");
 288
 289         return target->status;
 290 }
 291
 292 static int srp_send_req(struct srp_target_port *target)
 293 {
 294         struct {
 295                 struct ib_cm_req_param param;
 296                 struct srp_login_req   priv;
 297         } *req = NULL;
 298         int status;
 299
 300         req = kzalloc(sizeof *req, GFP_KERNEL);
 301         if (!req)
 302                 return -ENOMEM;
 303
 304         req->param.primary_path               = &target->path;
 305         req->param.alternate_path             = NULL;
 306         req->param.service_id                 = target->service_id;
 307         req->param.qp_num                     = target->qp->qp_num;
 308         req->param.qp_type                    = target->qp->qp_type;
 309         req->param.private_data               = &req->priv;
 310         req->param.private_data_len           = sizeof req->priv;
 311         req->param.flow_control               = 1;
 312
 313         get_random_bytes(&req->param.starting_psn, 4);
 314         req->param.starting_psn              &= 0xffffff;
 315
 316         /*
 317          * Pick some arbitrary defaults here; we could make these
 318          * module parameters if anyone cared about setting them.
 319          */
 320         req->param.responder_resources        = 4;
 321         req->param.remote_cm_response_timeout = 20;
 322         req->param.local_cm_response_timeout  = 20;
 323         req->param.retry_count                = 7;
 324         req->param.rnr_retry_count            = 7;
 325         req->param.max_cm_retries             = 15;
 326
 327         req->priv.opcode        = SRP_LOGIN_REQ;
 328         req->priv.tag           = 0;
 329         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 330         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 331                                               SRP_BUF_FORMAT_INDIRECT);
 332         /*
 333          * In the published SRP specification (draft rev. 16a), the
 334          * port identifier format is 8 bytes of ID extension followed
 335          * by 8 bytes of GUID.  Older drafts put the two halves in the
 336          * opposite order, so that the GUID comes first.
 337          *
 338          * Targets conforming to these obsolete drafts can be
 339          * recognized by the I/O Class they report.
 340          */
 341         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 342                 memcpy(req->priv.initiator_port_id,
 343                        target->srp_host->initiator_port_id + 8, 8);
 344                 memcpy(req->priv.initiator_port_id + 8,
 345                        target->srp_host->initiator_port_id, 8);
 346                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 347                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 348         } else {
 349                 memcpy(req->priv.initiator_port_id,
 350                        target->srp_host->initiator_port_id, 16);
 351                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 352                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 353         }
 354
 355         /*
 356          * Topspin/Cisco SRP targets will reject our login unless we
 357          * zero out the first 8 bytes of our initiator port ID.  The
 358          * second 8 bytes must be our local node GUID, but we always
 359          * use that anyway.
 360          */
 361         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 362                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 363                        "activated for target GUID %016llx\n",
 364                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 365                 memset(req->priv.initiator_port_id, 0, 8);
 366         }
 367
 368         status = ib_send_cm_req(target->cm_id, &req->param);
 369
 370         kfree(req);
 371
 372         return status;
 373 }
 374
 375 static void srp_disconnect_target(struct srp_target_port *target)
 376 {
 377         /* XXX should send SRP_I_LOGOUT request */
 378
 379         init_completion(&target->done);
 380         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 381                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 382                 return;
 383         }
 384         wait_for_completion(&target->done);
 385 }
 386
 387 static void srp_remove_work(void *target_ptr)
 388 {
 389         struct srp_target_port *target = target_ptr;
 390
 391         spin_lock_irq(target->scsi_host->host_lock);
 392         if (target->state != SRP_TARGET_DEAD) {
 393                 spin_unlock_irq(target->scsi_host->host_lock);
 394                 return;
 395         }
 396         target->state = SRP_TARGET_REMOVED;
 397         spin_unlock_irq(target->scsi_host->host_lock);
 398
 399         spin_lock(&target->srp_host->target_lock);
 400         list_del(&target->list);
 401         spin_unlock(&target->srp_host->target_lock);
 402
 403         scsi_remove_host(target->scsi_host);
 404         ib_destroy_cm_id(target->cm_id);
 405         srp_free_target_ib(target);
 406         scsi_host_put(target->scsi_host);
 407 }
 408
 409 static int srp_connect_target(struct srp_target_port *target)
 410 {
 411         int ret;
 412
 413         ret = srp_lookup_path(target);
 414         if (ret)
 415                 return ret;
 416
 417         while (1) {
 418                 init_completion(&target->done);
 419                 ret = srp_send_req(target);
 420                 if (ret)
 421                         return ret;
 422                 wait_for_completion(&target->done);
 423
 424                 /*
 425                  * The CM event handling code will set status to
 426                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 427                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 428                  * redirect REJ back.
 429                  */
 430                 switch (target->status) {
 431                 case 0:
 432                         return 0;
 433
 434                 case SRP_PORT_REDIRECT:
 435                         ret = srp_lookup_path(target);
 436                         if (ret)
 437                                 return ret;
 438                         break;
 439
 440                 case SRP_DLID_REDIRECT:
 441                         break;
 442
 443                 default:
 444                         return target->status;
 445                 }
 446         }
 447 }
 448
 449 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 450                            struct srp_target_port *target,
 451                            struct srp_request *req)
 452 {
 453         struct scatterlist *scat;
 454         int nents;
 455
 456         if (!scmnd->request_buffer ||
 457             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 458              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 459                 return;
 460
 461         if (req->fmr) {
 462                 ib_fmr_pool_unmap(req->fmr);
 463                 req->fmr = NULL;
 464         }
 465
 466         /*
 467          * This handling of non-SG commands can be killed when the
 468          * SCSI midlayer no longer generates non-SG commands.
 469          */
 470         if (likely(scmnd->use_sg)) {
 471                 nents = scmnd->use_sg;
 472                 scat  = scmnd->request_buffer;
 473         } else {
 474                 nents = 1;
 475                 scat  = &req->fake_sg;
 476         }
 477
 478         dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
 479                      scmnd->sc_data_direction);
 480 }
 481
 482 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 483 {
 484         srp_unmap_data(req->scmnd, target, req);
 485         list_move_tail(&req->list, &target->free_reqs);
 486 }
 487
 488 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 489 {
 490         req->scmnd->result = DID_RESET << 16;
 491         req->scmnd->scsi_done(req->scmnd);
 492         srp_remove_req(target, req);
 493 }
 494
 495 static int srp_reconnect_target(struct srp_target_port *target)
 496 {
 497         struct ib_cm_id *new_cm_id;
 498         struct ib_qp_attr qp_attr;
 499         struct srp_request *req, *tmp;
 500         struct ib_wc wc;
 501         int ret;
 502
 503         spin_lock_irq(target->scsi_host->host_lock);
 504         if (target->state != SRP_TARGET_LIVE) {
 505                 spin_unlock_irq(target->scsi_host->host_lock);
 506                 return -EAGAIN;
 507         }
 508         target->state = SRP_TARGET_CONNECTING;
 509         spin_unlock_irq(target->scsi_host->host_lock);
 510
 511         srp_disconnect_target(target);
 512         /*
 513          * Now get a new local CM ID so that we avoid confusing the
 514          * target in case things are really fouled up.
 515          */
 516         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 517                                     srp_cm_handler, target);
 518         if (IS_ERR(new_cm_id)) {
 519                 ret = PTR_ERR(new_cm_id);
 520                 goto err;
 521         }
 522         ib_destroy_cm_id(target->cm_id);
 523         target->cm_id = new_cm_id;
 524
 525         qp_attr.qp_state = IB_QPS_RESET;
 526         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 527         if (ret)
 528                 goto err;
 529
 530         ret = srp_init_qp(target, target->qp);
 531         if (ret)
 532                 goto err;
 533
 534         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 535                 ; /* nothing */
 536
 537         spin_lock_irq(target->scsi_host->host_lock);
 538         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 539                 srp_reset_req(target, req);
 540         spin_unlock_irq(target->scsi_host->host_lock);
 541
 542         target->rx_head  = 0;
 543         target->tx_head  = 0;
 544         target->tx_tail  = 0;
 545
 546         ret = srp_connect_target(target);
 547         if (ret)
 548                 goto err;
 549
 550         spin_lock_irq(target->scsi_host->host_lock);
 551         if (target->state == SRP_TARGET_CONNECTING) {
 552                 ret = 0;
 553                 target->state = SRP_TARGET_LIVE;
 554         } else
 555                 ret = -EAGAIN;
 556         spin_unlock_irq(target->scsi_host->host_lock);
 557
 558         return ret;
 559
 560 err:
 561         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 562
 563         /*
 564          * We couldn't reconnect, so kill our target port off.
 565          * However, we have to defer the real removal because we might
 566          * be in the context of the SCSI error handler now, which
 567          * would deadlock if we call scsi_remove_host().
 568          */
 569         spin_lock_irq(target->scsi_host->host_lock);
 570         if (target->state == SRP_TARGET_CONNECTING) {
 571                 target->state = SRP_TARGET_DEAD;
 572                 INIT_WORK(&target->work, srp_remove_work, target);
 573                 schedule_work(&target->work);
 574         }
 575         spin_unlock_irq(target->scsi_host->host_lock);
 576
 577         return ret;
 578 }
 579
 580 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 581                        int sg_cnt, struct srp_request *req,
 582                        struct srp_direct_buf *buf)
 583 {
 584         u64 io_addr = 0;
 585         u64 *dma_pages;
 586         u32 len;
 587         int page_cnt;
 588         int i, j;
 589         int ret;
 590         struct srp_device *dev = target->srp_host->dev;
 591
 592         if (!dev->fmr_pool)
 593                 return -ENODEV;
 594
 595         if ((sg_dma_address(&scat[0]) & ~dev->fmr_page_mask) &&
 596             mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3))
 597                 return -EINVAL;
 598
 599         len = page_cnt = 0;
 600         for (i = 0; i < sg_cnt; ++i) {
 601                 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
 602                         if (i > 0)
 603                                 return -EINVAL;
 604                         else
 605                                 ++page_cnt;
 606                 }
 607                 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
 608                     ~dev->fmr_page_mask) {
 609                         if (i < sg_cnt - 1)
 610                                 return -EINVAL;
 611                         else
 612                                 ++page_cnt;
 613                 }
 614
 615                 len += sg_dma_len(&scat[i]);
 616         }
 617
 618         page_cnt += len >> dev->fmr_page_shift;
 619         if (page_cnt > SRP_FMR_SIZE)
 620                 return -ENOMEM;
 621
 622         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 623         if (!dma_pages)
 624                 return -ENOMEM;
 625
 626         page_cnt = 0;
 627         for (i = 0; i < sg_cnt; ++i)
 628                 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
 629                         dma_pages[page_cnt++] =
 630                                 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
 631
 632         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 633                                         dma_pages, page_cnt, io_addr);
 634         if (IS_ERR(req->fmr)) {
 635                 ret = PTR_ERR(req->fmr);
 636                 req->fmr = NULL;
 637                 goto out;
 638         }
 639
 640         buf->va  = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
 641         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 642         buf->len = cpu_to_be32(len);
 643
 644         ret = 0;
 645
 646 out:
 647         kfree(dma_pages);
 648
 649         return ret;
 650 }
 651
 652 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 653                         struct srp_request *req)
 654 {
 655         struct scatterlist *scat;
 656         struct srp_cmd *cmd = req->cmd->buf;
 657         int len, nents, count;
 658         u8 fmt = SRP_DATA_DESC_DIRECT;
 659
 660         if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
 661                 return sizeof (struct srp_cmd);
 662
 663         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 664             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 665                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 666                        scmnd->sc_data_direction);
 667                 return -EINVAL;
 668         }
 669
 670         /*
 671          * This handling of non-SG commands can be killed when the
 672          * SCSI midlayer no longer generates non-SG commands.
 673          */
 674         if (likely(scmnd->use_sg)) {
 675                 nents = scmnd->use_sg;
 676                 scat  = scmnd->request_buffer;
 677         } else {
 678                 nents = 1;
 679                 scat  = &req->fake_sg;
 680                 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
 681         }
 682
 683         count = dma_map_sg(target->srp_host->dev->dev->dma_device,
 684                            scat, nents, scmnd->sc_data_direction);
 685
 686         fmt = SRP_DATA_DESC_DIRECT;
 687         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 688
 689         if (count == 1) {
 690                 /*
 691                  * The midlayer only generated a single gather/scatter
 692                  * entry, or DMA mapping coalesced everything to a
 693                  * single entry.  So a direct descriptor along with
 694                  * the DMA MR suffices.
 695                  */
 696                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 697
 698                 buf->va  = cpu_to_be64(sg_dma_address(scat));
 699                 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
 700                 buf->len = cpu_to_be32(sg_dma_len(scat));
 701         } else if (srp_map_fmr(target, scat, count, req,
 702                                (void *) cmd->add_data)) {
 703                 /*
 704                  * FMR mapping failed, and the scatterlist has more
 705                  * than one entry.  Generate an indirect memory
 706                  * descriptor.
 707                  */
 708                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 709                 u32 datalen = 0;
 710                 int i;
 711
 712                 fmt = SRP_DATA_DESC_INDIRECT;
 713                 len = sizeof (struct srp_cmd) +
 714                         sizeof (struct srp_indirect_buf) +
 715                         count * sizeof (struct srp_direct_buf);
 716
 717                 for (i = 0; i < count; ++i) {
 718                         buf->desc_list[i].va  =
 719                                 cpu_to_be64(sg_dma_address(&scat[i]));
 720                         buf->desc_list[i].key =
 721                                 cpu_to_be32(target->srp_host->dev->mr->rkey);
 722                         buf->desc_list[i].len =
 723                                 cpu_to_be32(sg_dma_len(&scat[i]));
 724                         datalen += sg_dma_len(&scat[i]);
 725                 }
 726
 727                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 728                         cmd->data_out_desc_cnt = count;
 729                 else
 730                         cmd->data_in_desc_cnt = count;
 731
 732                 buf->table_desc.va  =
 733                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 734                 buf->table_desc.key =
 735                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 736                 buf->table_desc.len =
 737                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 738
 739                 buf->len = cpu_to_be32(datalen);
 740         }
 741
 742         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 743                 cmd->buf_fmt = fmt << 4;
 744         else
 745                 cmd->buf_fmt = fmt;
 746
 747         return len;
 748 }
 749
 750 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 751 {
 752         struct srp_request *req;
 753         struct scsi_cmnd *scmnd;
 754         unsigned long flags;
 755         s32 delta;
 756
 757         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 758
 759         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 760
 761         target->req_lim += delta;
 762
 763         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 764
 765         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 766                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 767                         req->tsk_status = -1;
 768                 else
 769                         req->tsk_status = rsp->data[3];
 770                 complete(&req->done);
 771         } else {
 772                 scmnd = req->scmnd;
 773                 if (!scmnd)
 774                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 775                                (unsigned long long) rsp->tag);
 776                 scmnd->result = rsp->status;
 777
 778                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 779                         memcpy(scmnd->sense_buffer, rsp->data +
 780                                be32_to_cpu(rsp->resp_data_len),
 781                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 782                                      SCSI_SENSE_BUFFERSIZE));
 783                 }
 784
 785                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 786                         scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
 787                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 788                         scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
 789
 790                 if (!req->tsk_mgmt) {
 791                         scmnd->host_scribble = (void *) -1L;
 792                         scmnd->scsi_done(scmnd);
 793
 794                         srp_remove_req(target, req);
 795                 } else
 796                         req->cmd_done = 1;
 797         }
 798
 799         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 800 }
 801
 802 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 803 {
 804         struct srp_iu *iu;
 805         u8 opcode;
 806
 807         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 808
 809         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
 810                                 target->max_ti_iu_len, DMA_FROM_DEVICE);
 811
 812         opcode = *(u8 *) iu->buf;
 813
 814         if (0) {
 815                 int i;
 816
 817                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 818
 819                 for (i = 0; i < wc->byte_len; ++i) {
 820                         if (i % 8 == 0)
 821                                 printk(KERN_ERR "  [%02x] ", i);
 822                         printk(" %02x", ((u8 *) iu->buf)[i]);
 823                         if ((i + 1) % 8 == 0)
 824                                 printk("\n");
 825                 }
 826
 827                 if (wc->byte_len % 8)
 828                         printk("\n");
 829         }
 830
 831         switch (opcode) {
 832         case SRP_RSP:
 833                 srp_process_rsp(target, iu->buf);
 834                 break;
 835
 836         case SRP_T_LOGOUT:
 837                 /* XXX Handle target logout */
 838                 printk(KERN_WARNING PFX "Got target logout request\n");
 839                 break;
 840
 841         default:
 842                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 843                 break;
 844         }
 845
 846         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
 847                                    target->max_ti_iu_len, DMA_FROM_DEVICE);
 848 }
 849
 850 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 851 {
 852         struct srp_target_port *target = target_ptr;
 853         struct ib_wc wc;
 854
 855         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 856         while (ib_poll_cq(cq, 1, &wc) > 0) {
 857                 if (wc.status) {
 858                         printk(KERN_ERR PFX "failed %s status %d\n",
 859                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 860                                wc.status);
 861                         break;
 862                 }
 863
 864                 if (wc.wr_id & SRP_OP_RECV)
 865                         srp_handle_recv(target, &wc);
 866                 else
 867                         ++target->tx_tail;
 868         }
 869 }
 870
 871 static int __srp_post_recv(struct srp_target_port *target)
 872 {
 873         struct srp_iu *iu;
 874         struct ib_sge list;
 875         struct ib_recv_wr wr, *bad_wr;
 876         unsigned int next;
 877         int ret;
 878
 879         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 880         wr.wr_id = next | SRP_OP_RECV;
 881         iu       = target->rx_ring[next];
 882
 883         list.addr   = iu->dma;
 884         list.length = iu->size;
 885         list.lkey   = target->srp_host->dev->mr->lkey;
 886
 887         wr.next     = NULL;
 888         wr.sg_list  = &list;
 889         wr.num_sge  = 1;
 890
 891         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 892         if (!ret)
 893                 ++target->rx_head;
 894
 895         return ret;
 896 }
 897
 898 static int srp_post_recv(struct srp_target_port *target)
 899 {
 900         unsigned long flags;
 901         int ret;
 902
 903         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 904         ret = __srp_post_recv(target);
 905         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 906
 907         return ret;
 908 }
 909
 910 /*
 911  * Must be called with target->scsi_host->host_lock held to protect
 912  * req_lim and tx_head.  Lock cannot be dropped between call here and
 913  * call to __srp_post_send().
 914  */
 915 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 916 {
 917         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 918                 return NULL;
 919
 920         if (unlikely(target->req_lim < 1))
 921                 ++target->zero_req_lim;
 922
 923         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 924 }
 925
 926 /*
 927  * Must be called with target->scsi_host->host_lock held to protect
 928  * req_lim and tx_head.
 929  */
 930 static int __srp_post_send(struct srp_target_port *target,
 931                            struct srp_iu *iu, int len)
 932 {
 933         struct ib_sge list;
 934         struct ib_send_wr wr, *bad_wr;
 935         int ret = 0;
 936
 937         list.addr   = iu->dma;
 938         list.length = len;
 939         list.lkey   = target->srp_host->dev->mr->lkey;
 940
 941         wr.next       = NULL;
 942         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 943         wr.sg_list    = &list;
 944         wr.num_sge    = 1;
 945         wr.opcode     = IB_WR_SEND;
 946         wr.send_flags = IB_SEND_SIGNALED;
 947
 948         ret = ib_post_send(target->qp, &wr, &bad_wr);
 949
 950         if (!ret) {
 951                 ++target->tx_head;
 952                 --target->req_lim;
 953         }
 954
 955         return ret;
 956 }
 957
 958 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 959                             void (*done)(struct scsi_cmnd *))
 960 {
 961         struct srp_target_port *target = host_to_target(scmnd->device->host);
 962         struct srp_request *req;
 963         struct srp_iu *iu;
 964         struct srp_cmd *cmd;
 965         int len;
 966
 967         if (target->state == SRP_TARGET_CONNECTING)
 968                 goto err;
 969
 970         if (target->state == SRP_TARGET_DEAD ||
 971             target->state == SRP_TARGET_REMOVED) {
 972                 scmnd->result = DID_BAD_TARGET << 16;
 973                 done(scmnd);
 974                 return 0;
 975         }
 976
 977         iu = __srp_get_tx_iu(target);
 978         if (!iu)
 979                 goto err;
 980
 981         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
 982                                 srp_max_iu_len, DMA_TO_DEVICE);
 983
 984         req = list_entry(target->free_reqs.next, struct srp_request, list);
 985
 986         scmnd->scsi_done     = done;
 987         scmnd->result        = 0;
 988         scmnd->host_scribble = (void *) (long) req->index;
 989
 990         cmd = iu->buf;
 991         memset(cmd, 0, sizeof *cmd);
 992
 993         cmd->opcode = SRP_CMD;
 994         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
 995         cmd->tag    = req->index;
 996         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
 997
 998         req->scmnd    = scmnd;
 999         req->cmd      = iu;
1000         req->cmd_done = 0;
1001         req->tsk_mgmt = NULL;
1002
1003         len = srp_map_data(scmnd, target, req);
1004         if (len < 0) {
1005                 printk(KERN_ERR PFX "Failed to map data\n");
1006                 goto err;
1007         }
1008
1009         if (__srp_post_recv(target)) {
1010                 printk(KERN_ERR PFX "Recv failed\n");
1011                 goto err_unmap;
1012         }
1013
1014         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
1015                                    srp_max_iu_len, DMA_TO_DEVICE);
1016
1017         if (__srp_post_send(target, iu, len)) {
1018                 printk(KERN_ERR PFX "Send failed\n");
1019                 goto err_unmap;
1020         }
1021
1022         list_move_tail(&req->list, &target->req_queue);
1023
1024         return 0;
1025
1026 err_unmap:
1027         srp_unmap_data(scmnd, target, req);
1028
1029 err:
1030         return SCSI_MLQUEUE_HOST_BUSY;
1031 }
1032
1033 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1034 {
1035         int i;
1036
1037         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1038                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1039                                                   target->max_ti_iu_len,
1040                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1041                 if (!target->rx_ring[i])
1042                         goto err;
1043         }
1044
1045         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1046                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1047                                                   srp_max_iu_len,
1048                                                   GFP_KERNEL, DMA_TO_DEVICE);
1049                 if (!target->tx_ring[i])
1050                         goto err;
1051         }
1052
1053         return 0;
1054
1055 err:
1056         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1057                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1058                 target->rx_ring[i] = NULL;
1059         }
1060
1061         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1062                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1063                 target->tx_ring[i] = NULL;
1064         }
1065
1066         return -ENOMEM;
1067 }
1068
1069 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1070                                struct ib_cm_event *event,
1071                                struct srp_target_port *target)
1072 {
1073         struct ib_class_port_info *cpi;
1074         int opcode;
1075
1076         switch (event->param.rej_rcvd.reason) {
1077         case IB_CM_REJ_PORT_CM_REDIRECT:
1078                 cpi = event->param.rej_rcvd.ari;
1079                 target->path.dlid = cpi->redirect_lid;
1080                 target->path.pkey = cpi->redirect_pkey;
1081                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1082                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1083
1084                 target->status = target->path.dlid ?
1085                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1086                 break;
1087
1088         case IB_CM_REJ_PORT_REDIRECT:
1089                 if (topspin_workarounds &&
1090                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1091                         /*
1092                          * Topspin/Cisco SRP gateways incorrectly send
1093                          * reject reason code 25 when they mean 24
1094                          * (port redirect).
1095                          */
1096                         memcpy(target->path.dgid.raw,
1097                                event->param.rej_rcvd.ari, 16);
1098
1099                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1100                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1101                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1102
1103                         target->status = SRP_PORT_REDIRECT;
1104                 } else {
1105                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1106                         target->status = -ECONNRESET;
1107                 }
1108                 break;
1109
1110         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1111                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1112                 target->status = -ECONNRESET;
1113                 break;
1114
1115         case IB_CM_REJ_CONSUMER_DEFINED:
1116                 opcode = *(u8 *) event->private_data;
1117                 if (opcode == SRP_LOGIN_REJ) {
1118                         struct srp_login_rej *rej = event->private_data;
1119                         u32 reason = be32_to_cpu(rej->reason);
1120
1121                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1122                                 printk(KERN_WARNING PFX
1123                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1124                         else
1125                                 printk(KERN_WARNING PFX
1126                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1127                 } else
1128                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1129                                " opcode 0x%02x\n", opcode);
1130                 target->status = -ECONNRESET;
1131                 break;
1132
1133         default:
1134                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1135                        event->param.rej_rcvd.reason);
1136                 target->status = -ECONNRESET;
1137         }
1138 }
1139
1140 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1141 {
1142         struct srp_target_port *target = cm_id->context;
1143         struct ib_qp_attr *qp_attr = NULL;
1144         int attr_mask = 0;
1145         int comp = 0;
1146         int opcode = 0;
1147
1148         switch (event->event) {
1149         case IB_CM_REQ_ERROR:
1150                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1151                 comp = 1;
1152                 target->status = -ECONNRESET;
1153                 break;
1154
1155         case IB_CM_REP_RECEIVED:
1156                 comp = 1;
1157                 opcode = *(u8 *) event->private_data;
1158
1159                 if (opcode == SRP_LOGIN_RSP) {
1160                         struct srp_login_rsp *rsp = event->private_data;
1161
1162                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1163                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1164
1165                         target->scsi_host->can_queue = min(target->req_lim,
1166                                                            target->scsi_host->can_queue);
1167                 } else {
1168                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1169                         target->status = -ECONNRESET;
1170                         break;
1171                 }
1172
1173                 target->status = srp_alloc_iu_bufs(target);
1174                 if (target->status)
1175                         break;
1176
1177                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1178                 if (!qp_attr) {
1179                         target->status = -ENOMEM;
1180                         break;
1181                 }
1182
1183                 qp_attr->qp_state = IB_QPS_RTR;
1184                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1185                 if (target->status)
1186                         break;
1187
1188                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1189                 if (target->status)
1190                         break;
1191
1192                 target->status = srp_post_recv(target);
1193                 if (target->status)
1194                         break;
1195
1196                 qp_attr->qp_state = IB_QPS_RTS;
1197                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1198                 if (target->status)
1199                         break;
1200
1201                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1202                 if (target->status)
1203                         break;
1204
1205                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1206                 if (target->status)
1207                         break;
1208
1209                 break;
1210
1211         case IB_CM_REJ_RECEIVED:
1212                 printk(KERN_DEBUG PFX "REJ received\n");
1213                 comp = 1;
1214
1215                 srp_cm_rej_handler(cm_id, event, target);
1216                 break;
1217
1218         case IB_CM_DREQ_RECEIVED:
1219                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1220                 if (ib_send_cm_drep(cm_id, NULL, 0))
1221                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1222                 break;
1223
1224         case IB_CM_TIMEWAIT_EXIT:
1225                 printk(KERN_ERR PFX "connection closed\n");
1226
1227                 comp = 1;
1228                 target->status = 0;
1229                 break;
1230
1231         case IB_CM_MRA_RECEIVED:
1232         case IB_CM_DREQ_ERROR:
1233         case IB_CM_DREP_RECEIVED:
1234                 break;
1235
1236         default:
1237                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1238                 break;
1239         }
1240
1241         if (comp)
1242                 complete(&target->done);
1243
1244         kfree(qp_attr);
1245
1246         return 0;
1247 }
1248
1249 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1250                              struct srp_request *req, u8 func)
1251 {
1252         struct srp_iu *iu;
1253         struct srp_tsk_mgmt *tsk_mgmt;
1254
1255         spin_lock_irq(target->scsi_host->host_lock);
1256
1257         if (target->state == SRP_TARGET_DEAD ||
1258             target->state == SRP_TARGET_REMOVED) {
1259                 req->scmnd->result = DID_BAD_TARGET << 16;
1260                 goto out;
1261         }
1262
1263         init_completion(&req->done);
1264
1265         iu = __srp_get_tx_iu(target);
1266         if (!iu)
1267                 goto out;
1268
1269         tsk_mgmt = iu->buf;
1270         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1271
1272         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1273         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1274         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1275         tsk_mgmt->tsk_mgmt_func = func;
1276         tsk_mgmt->task_tag      = req->index;
1277
1278         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1279                 goto out;
1280
1281         req->tsk_mgmt = iu;
1282
1283         spin_unlock_irq(target->scsi_host->host_lock);
1284
1285         if (!wait_for_completion_timeout(&req->done,
1286                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1287                 return -1;
1288
1289         return 0;
1290
1291 out:
1292         spin_unlock_irq(target->scsi_host->host_lock);
1293         return -1;
1294 }
1295
1296 static int srp_find_req(struct srp_target_port *target,
1297                         struct scsi_cmnd *scmnd,
1298                         struct srp_request **req)
1299 {
1300         if (scmnd->host_scribble == (void *) -1L)
1301                 return -1;
1302
1303         *req = &target->req_ring[(long) scmnd->host_scribble];
1304
1305         return 0;
1306 }
1307
1308 static int srp_abort(struct scsi_cmnd *scmnd)
1309 {
1310         struct srp_target_port *target = host_to_target(scmnd->device->host);
1311         struct srp_request *req;
1312         int ret = SUCCESS;
1313
1314         printk(KERN_ERR "SRP abort called\n");
1315
1316         if (srp_find_req(target, scmnd, &req))
1317                 return FAILED;
1318         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1319                 return FAILED;
1320
1321         spin_lock_irq(target->scsi_host->host_lock);
1322
1323         if (req->cmd_done) {
1324                 srp_remove_req(target, req);
1325                 scmnd->scsi_done(scmnd);
1326         } else if (!req->tsk_status) {
1327                 srp_remove_req(target, req);
1328                 scmnd->result = DID_ABORT << 16;
1329         } else
1330                 ret = FAILED;
1331
1332         spin_unlock_irq(target->scsi_host->host_lock);
1333
1334         return ret;
1335 }
1336
1337 static int srp_reset_device(struct scsi_cmnd *scmnd)
1338 {
1339         struct srp_target_port *target = host_to_target(scmnd->device->host);
1340         struct srp_request *req, *tmp;
1341
1342         printk(KERN_ERR "SRP reset_device called\n");
1343
1344         if (srp_find_req(target, scmnd, &req))
1345                 return FAILED;
1346         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1347                 return FAILED;
1348         if (req->tsk_status)
1349                 return FAILED;
1350
1351         spin_lock_irq(target->scsi_host->host_lock);
1352
1353         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1354                 if (req->scmnd->device == scmnd->device)
1355                         srp_reset_req(target, req);
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_LIST_HEAD(&target->free_reqs);
1697         INIT_LIST_HEAD(&target->req_queue);
1698         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1699                 target->req_ring[i].index = i;
1700                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1701         }
1702
1703         ret = srp_parse_options(buf, target);
1704         if (ret)
1705                 goto err;
1706
1707         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1708
1709         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1710                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1711                (unsigned long long) be64_to_cpu(target->id_ext),
1712                (unsigned long long) be64_to_cpu(target->ioc_guid),
1713                be16_to_cpu(target->path.pkey),
1714                (unsigned long long) be64_to_cpu(target->service_id),
1715                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1716                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1717                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1718                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1719                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1720                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1721                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1722                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1723
1724         ret = srp_create_target_ib(target);
1725         if (ret)
1726                 goto err;
1727
1728         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1729         if (IS_ERR(target->cm_id)) {
1730                 ret = PTR_ERR(target->cm_id);
1731                 goto err_free;
1732         }
1733
1734         ret = srp_connect_target(target);
1735         if (ret) {
1736                 printk(KERN_ERR PFX "Connection failed\n");
1737                 goto err_cm_id;
1738         }
1739
1740         ret = srp_add_target(host, target);
1741         if (ret)
1742                 goto err_disconnect;
1743
1744         return count;
1745
1746 err_disconnect:
1747         srp_disconnect_target(target);
1748
1749 err_cm_id:
1750         ib_destroy_cm_id(target->cm_id);
1751
1752 err_free:
1753         srp_free_target_ib(target);
1754
1755 err:
1756         scsi_host_put(target_host);
1757
1758         return ret;
1759 }
1760
1761 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1762
1763 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1764 {
1765         struct srp_host *host =
1766                 container_of(class_dev, struct srp_host, class_dev);
1767
1768         return sprintf(buf, "%s\n", host->dev->dev->name);
1769 }
1770
1771 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1772
1773 static ssize_t show_port(struct class_device *class_dev, char *buf)
1774 {
1775         struct srp_host *host =
1776                 container_of(class_dev, struct srp_host, class_dev);
1777
1778         return sprintf(buf, "%d\n", host->port);
1779 }
1780
1781 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1782
1783 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1784 {
1785         struct srp_host *host;
1786
1787         host = kzalloc(sizeof *host, GFP_KERNEL);
1788         if (!host)
1789                 return NULL;
1790
1791         INIT_LIST_HEAD(&host->target_list);
1792         spin_lock_init(&host->target_lock);
1793         init_completion(&host->released);
1794         host->dev  = device;
1795         host->port = port;
1796
1797         host->initiator_port_id[7] = port;
1798         memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1799
1800         host->class_dev.class = &srp_class;
1801         host->class_dev.dev   = device->dev->dma_device;
1802         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1803                  device->dev->name, port);
1804
1805         if (class_device_register(&host->class_dev))
1806                 goto free_host;
1807         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1808                 goto err_class;
1809         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1810                 goto err_class;
1811         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1812                 goto err_class;
1813
1814         return host;
1815
1816 err_class:
1817         class_device_unregister(&host->class_dev);
1818
1819 free_host:
1820         kfree(host);
1821
1822         return NULL;
1823 }
1824
1825 static void srp_add_one(struct ib_device *device)
1826 {
1827         struct srp_device *srp_dev;
1828         struct ib_device_attr *dev_attr;
1829         struct ib_fmr_pool_param fmr_param;
1830         struct srp_host *host;
1831         int s, e, p;
1832
1833         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1834         if (!dev_attr)
1835                 return;
1836
1837         if (ib_query_device(device, dev_attr)) {
1838                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1839                        device->name);
1840                 goto free_attr;
1841         }
1842
1843         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1844         if (!srp_dev)
1845                 goto free_attr;
1846
1847         /*
1848          * Use the smallest page size supported by the HCA, down to a
1849          * minimum of 512 bytes (which is the smallest sector that a
1850          * SCSI command will ever carry).
1851          */
1852         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1853         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1854         srp_dev->fmr_page_mask  = ~((unsigned long) srp_dev->fmr_page_size - 1);
1855
1856         INIT_LIST_HEAD(&srp_dev->dev_list);
1857
1858         srp_dev->dev = device;
1859         srp_dev->pd  = ib_alloc_pd(device);
1860         if (IS_ERR(srp_dev->pd))
1861                 goto free_dev;
1862
1863         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1864                                     IB_ACCESS_LOCAL_WRITE |
1865                                     IB_ACCESS_REMOTE_READ |
1866                                     IB_ACCESS_REMOTE_WRITE);
1867         if (IS_ERR(srp_dev->mr))
1868                 goto err_pd;
1869
1870         memset(&fmr_param, 0, sizeof fmr_param);
1871         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1872         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1873         fmr_param.cache             = 1;
1874         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1875         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1876         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1877                                        IB_ACCESS_REMOTE_WRITE |
1878                                        IB_ACCESS_REMOTE_READ);
1879
1880         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1881         if (IS_ERR(srp_dev->fmr_pool))
1882                 srp_dev->fmr_pool = NULL;
1883
1884         if (device->node_type == IB_NODE_SWITCH) {
1885                 s = 0;
1886                 e = 0;
1887         } else {
1888                 s = 1;
1889                 e = device->phys_port_cnt;
1890         }
1891
1892         for (p = s; p <= e; ++p) {
1893                 host = srp_add_port(srp_dev, p);
1894                 if (host)
1895                         list_add_tail(&host->list, &srp_dev->dev_list);
1896         }
1897
1898         ib_set_client_data(device, &srp_client, srp_dev);
1899
1900         goto free_attr;
1901
1902 err_pd:
1903         ib_dealloc_pd(srp_dev->pd);
1904
1905 free_dev:
1906         kfree(srp_dev);
1907
1908 free_attr:
1909         kfree(dev_attr);
1910 }
1911
1912 static void srp_remove_one(struct ib_device *device)
1913 {
1914         struct srp_device *srp_dev;
1915         struct srp_host *host, *tmp_host;
1916         LIST_HEAD(target_list);
1917         struct srp_target_port *target, *tmp_target;
1918
1919         srp_dev = ib_get_client_data(device, &srp_client);
1920
1921         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1922                 class_device_unregister(&host->class_dev);
1923                 /*
1924                  * Wait for the sysfs entry to go away, so that no new
1925                  * target ports can be created.
1926                  */
1927                 wait_for_completion(&host->released);
1928
1929                 /*
1930                  * Mark all target ports as removed, so we stop queueing
1931                  * commands and don't try to reconnect.
1932                  */
1933                 spin_lock(&host->target_lock);
1934                 list_for_each_entry(target, &host->target_list, list) {
1935                         spin_lock_irq(target->scsi_host->host_lock);
1936                         target->state = SRP_TARGET_REMOVED;
1937                         spin_unlock_irq(target->scsi_host->host_lock);
1938                 }
1939                 spin_unlock(&host->target_lock);
1940
1941                 /*
1942                  * Wait for any reconnection tasks that may have
1943                  * started before we marked our target ports as
1944                  * removed, and any target port removal tasks.
1945                  */
1946                 flush_scheduled_work();
1947
1948                 list_for_each_entry_safe(target, tmp_target,
1949                                          &host->target_list, list) {
1950                         scsi_remove_host(target->scsi_host);
1951                         srp_disconnect_target(target);
1952                         ib_destroy_cm_id(target->cm_id);
1953                         srp_free_target_ib(target);
1954                         scsi_host_put(target->scsi_host);
1955                 }
1956
1957                 kfree(host);
1958         }
1959
1960         if (srp_dev->fmr_pool)
1961                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1962         ib_dereg_mr(srp_dev->mr);
1963         ib_dealloc_pd(srp_dev->pd);
1964
1965         kfree(srp_dev);
1966 }
1967
1968 static int __init srp_init_module(void)
1969 {
1970         int ret;
1971
1972         srp_template.sg_tablesize = srp_sg_tablesize;
1973         srp_max_iu_len = (sizeof (struct srp_cmd) +
1974                           sizeof (struct srp_indirect_buf) +
1975                           srp_sg_tablesize * 16);
1976
1977         ret = class_register(&srp_class);
1978         if (ret) {
1979                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1980                 return ret;
1981         }
1982
1983         ret = ib_register_client(&srp_client);
1984         if (ret) {
1985                 printk(KERN_ERR PFX "couldn't register IB client\n");
1986                 class_unregister(&srp_class);
1987                 return ret;
1988         }
1989
1990         return 0;
1991 }
1992
1993 static void __exit srp_cleanup_module(void)
1994 {
1995         ib_unregister_client(&srp_client);
1996         class_unregister(&srp_class);
1997 }
1998
1999 module_init(srp_init_module);
2000 module_exit(srp_cleanup_module);