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 struct ib_sa_client srp_sa_client;
 100
 101 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
 102 {
 103         return (struct srp_target_port *) host->hostdata;
 104 }
 105
 106 static const char *srp_target_info(struct Scsi_Host *host)
 107 {
 108         return host_to_target(host)->target_name;
 109 }
 110
 111 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 112                                    gfp_t gfp_mask,
 113                                    enum dma_data_direction direction)
 114 {
 115         struct srp_iu *iu;
 116
 117         iu = kmalloc(sizeof *iu, gfp_mask);
 118         if (!iu)
 119                 goto out;
 120
 121         iu->buf = kzalloc(size, gfp_mask);
 122         if (!iu->buf)
 123                 goto out_free_iu;
 124
 125         iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
 126         if (ib_dma_mapping_error(host->dev->dev, iu->dma))
 127                 goto out_free_buf;
 128
 129         iu->size      = size;
 130         iu->direction = direction;
 131
 132         return iu;
 133
 134 out_free_buf:
 135         kfree(iu->buf);
 136 out_free_iu:
 137         kfree(iu);
 138 out:
 139         return NULL;
 140 }
 141
 142 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 143 {
 144         if (!iu)
 145                 return;
 146
 147         ib_dma_unmap_single(host->dev->dev, 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(&srp_sa_client,
 271                                                    target->srp_host->dev->dev,
 272                                                    target->srp_host->port,
 273                                                    &target->path,
 274                                                    IB_SA_PATH_REC_DGID          |
 275                                                    IB_SA_PATH_REC_SGID          |
 276                                                    IB_SA_PATH_REC_NUMB_PATH     |
 277                                                    IB_SA_PATH_REC_PKEY,
 278                                                    SRP_PATH_REC_TIMEOUT_MS,
 279                                                    GFP_KERNEL,
 280                                                    srp_path_rec_completion,
 281                                                    target, &target->path_query);
 282         if (target->path_query_id < 0)
 283                 return target->path_query_id;
 284
 285         wait_for_completion(&target->done);
 286
 287         if (target->status < 0)
 288                 printk(KERN_WARNING PFX "Path record query failed\n");
 289
 290         return target->status;
 291 }
 292
 293 static int srp_send_req(struct srp_target_port *target)
 294 {
 295         struct {
 296                 struct ib_cm_req_param param;
 297                 struct srp_login_req   priv;
 298         } *req = NULL;
 299         int status;
 300
 301         req = kzalloc(sizeof *req, GFP_KERNEL);
 302         if (!req)
 303                 return -ENOMEM;
 304
 305         req->param.primary_path               = &target->path;
 306         req->param.alternate_path             = NULL;
 307         req->param.service_id                 = target->service_id;
 308         req->param.qp_num                     = target->qp->qp_num;
 309         req->param.qp_type                    = target->qp->qp_type;
 310         req->param.private_data               = &req->priv;
 311         req->param.private_data_len           = sizeof req->priv;
 312         req->param.flow_control               = 1;
 313
 314         get_random_bytes(&req->param.starting_psn, 4);
 315         req->param.starting_psn              &= 0xffffff;
 316
 317         /*
 318          * Pick some arbitrary defaults here; we could make these
 319          * module parameters if anyone cared about setting them.
 320          */
 321         req->param.responder_resources        = 4;
 322         req->param.remote_cm_response_timeout = 20;
 323         req->param.local_cm_response_timeout  = 20;
 324         req->param.retry_count                = 7;
 325         req->param.rnr_retry_count            = 7;
 326         req->param.max_cm_retries             = 15;
 327
 328         req->priv.opcode        = SRP_LOGIN_REQ;
 329         req->priv.tag           = 0;
 330         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 331         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 332                                               SRP_BUF_FORMAT_INDIRECT);
 333         /*
 334          * In the published SRP specification (draft rev. 16a), the
 335          * port identifier format is 8 bytes of ID extension followed
 336          * by 8 bytes of GUID.  Older drafts put the two halves in the
 337          * opposite order, so that the GUID comes first.
 338          *
 339          * Targets conforming to these obsolete drafts can be
 340          * recognized by the I/O Class they report.
 341          */
 342         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 343                 memcpy(req->priv.initiator_port_id,
 344                        &target->path.sgid.global.interface_id, 8);
 345                 memcpy(req->priv.initiator_port_id + 8,
 346                        &target->initiator_ext, 8);
 347                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 348                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 349         } else {
 350                 memcpy(req->priv.initiator_port_id,
 351                        &target->initiator_ext, 8);
 352                 memcpy(req->priv.initiator_port_id + 8,
 353                        &target->path.sgid.global.interface_id, 8);
 354                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 355                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 356         }
 357
 358         /*
 359          * Topspin/Cisco SRP targets will reject our login unless we
 360          * zero out the first 8 bytes of our initiator port ID and set
 361          * the second 8 bytes to the local node GUID.
 362          */
 363         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
 364                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 365                        "activated for target GUID %016llx\n",
 366                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 367                 memset(req->priv.initiator_port_id, 0, 8);
 368                 memcpy(req->priv.initiator_port_id + 8,
 369                        &target->srp_host->dev->dev->node_guid, 8);
 370         }
 371
 372         status = ib_send_cm_req(target->cm_id, &req->param);
 373
 374         kfree(req);
 375
 376         return status;
 377 }
 378
 379 static void srp_disconnect_target(struct srp_target_port *target)
 380 {
 381         /* XXX should send SRP_I_LOGOUT request */
 382
 383         init_completion(&target->done);
 384         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 385                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 386                 return;
 387         }
 388         wait_for_completion(&target->done);
 389 }
 390
 391 static void srp_remove_work(struct work_struct *work)
 392 {
 393         struct srp_target_port *target =
 394                 container_of(work, struct srp_target_port, work);
 395
 396         spin_lock_irq(target->scsi_host->host_lock);
 397         if (target->state != SRP_TARGET_DEAD) {
 398                 spin_unlock_irq(target->scsi_host->host_lock);
 399                 return;
 400         }
 401         target->state = SRP_TARGET_REMOVED;
 402         spin_unlock_irq(target->scsi_host->host_lock);
 403
 404         spin_lock(&target->srp_host->target_lock);
 405         list_del(&target->list);
 406         spin_unlock(&target->srp_host->target_lock);
 407
 408         scsi_remove_host(target->scsi_host);
 409         ib_destroy_cm_id(target->cm_id);
 410         srp_free_target_ib(target);
 411         scsi_host_put(target->scsi_host);
 412 }
 413
 414 static int srp_connect_target(struct srp_target_port *target)
 415 {
 416         int ret;
 417
 418         ret = srp_lookup_path(target);
 419         if (ret)
 420                 return ret;
 421
 422         while (1) {
 423                 init_completion(&target->done);
 424                 ret = srp_send_req(target);
 425                 if (ret)
 426                         return ret;
 427                 wait_for_completion(&target->done);
 428
 429                 /*
 430                  * The CM event handling code will set status to
 431                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 432                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 433                  * redirect REJ back.
 434                  */
 435                 switch (target->status) {
 436                 case 0:
 437                         return 0;
 438
 439                 case SRP_PORT_REDIRECT:
 440                         ret = srp_lookup_path(target);
 441                         if (ret)
 442                                 return ret;
 443                         break;
 444
 445                 case SRP_DLID_REDIRECT:
 446                         break;
 447
 448                 default:
 449                         return target->status;
 450                 }
 451         }
 452 }
 453
 454 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 455                            struct srp_target_port *target,
 456                            struct srp_request *req)
 457 {
 458         struct scatterlist *scat;
 459         int nents;
 460
 461         if (!scmnd->request_buffer ||
 462             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 463              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 464                 return;
 465
 466         if (req->fmr) {
 467                 ib_fmr_pool_unmap(req->fmr);
 468                 req->fmr = NULL;
 469         }
 470
 471         /*
 472          * This handling of non-SG commands can be killed when the
 473          * SCSI midlayer no longer generates non-SG commands.
 474          */
 475         if (likely(scmnd->use_sg)) {
 476                 nents = scmnd->use_sg;
 477                 scat  = scmnd->request_buffer;
 478         } else {
 479                 nents = 1;
 480                 scat  = &req->fake_sg;
 481         }
 482
 483         ib_dma_unmap_sg(target->srp_host->dev->dev, scat, nents,
 484                         scmnd->sc_data_direction);
 485 }
 486
 487 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 488 {
 489         srp_unmap_data(req->scmnd, target, req);
 490         list_move_tail(&req->list, &target->free_reqs);
 491 }
 492
 493 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 494 {
 495         req->scmnd->result = DID_RESET << 16;
 496         req->scmnd->scsi_done(req->scmnd);
 497         srp_remove_req(target, req);
 498 }
 499
 500 static int srp_reconnect_target(struct srp_target_port *target)
 501 {
 502         struct ib_cm_id *new_cm_id;
 503         struct ib_qp_attr qp_attr;
 504         struct srp_request *req, *tmp;
 505         struct ib_wc wc;
 506         int ret;
 507
 508         spin_lock_irq(target->scsi_host->host_lock);
 509         if (target->state != SRP_TARGET_LIVE) {
 510                 spin_unlock_irq(target->scsi_host->host_lock);
 511                 return -EAGAIN;
 512         }
 513         target->state = SRP_TARGET_CONNECTING;
 514         spin_unlock_irq(target->scsi_host->host_lock);
 515
 516         srp_disconnect_target(target);
 517         /*
 518          * Now get a new local CM ID so that we avoid confusing the
 519          * target in case things are really fouled up.
 520          */
 521         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 522                                     srp_cm_handler, target);
 523         if (IS_ERR(new_cm_id)) {
 524                 ret = PTR_ERR(new_cm_id);
 525                 goto err;
 526         }
 527         ib_destroy_cm_id(target->cm_id);
 528         target->cm_id = new_cm_id;
 529
 530         qp_attr.qp_state = IB_QPS_RESET;
 531         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 532         if (ret)
 533                 goto err;
 534
 535         ret = srp_init_qp(target, target->qp);
 536         if (ret)
 537                 goto err;
 538
 539         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 540                 ; /* nothing */
 541
 542         spin_lock_irq(target->scsi_host->host_lock);
 543         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 544                 srp_reset_req(target, req);
 545         spin_unlock_irq(target->scsi_host->host_lock);
 546
 547         target->rx_head  = 0;
 548         target->tx_head  = 0;
 549         target->tx_tail  = 0;
 550
 551         target->qp_in_error = 0;
 552         ret = srp_connect_target(target);
 553         if (ret)
 554                 goto err;
 555
 556         spin_lock_irq(target->scsi_host->host_lock);
 557         if (target->state == SRP_TARGET_CONNECTING) {
 558                 ret = 0;
 559                 target->state = SRP_TARGET_LIVE;
 560         } else
 561                 ret = -EAGAIN;
 562         spin_unlock_irq(target->scsi_host->host_lock);
 563
 564         return ret;
 565
 566 err:
 567         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 568
 569         /*
 570          * We couldn't reconnect, so kill our target port off.
 571          * However, we have to defer the real removal because we might
 572          * be in the context of the SCSI error handler now, which
 573          * would deadlock if we call scsi_remove_host().
 574          */
 575         spin_lock_irq(target->scsi_host->host_lock);
 576         if (target->state == SRP_TARGET_CONNECTING) {
 577                 target->state = SRP_TARGET_DEAD;
 578                 INIT_WORK(&target->work, srp_remove_work);
 579                 schedule_work(&target->work);
 580         }
 581         spin_unlock_irq(target->scsi_host->host_lock);
 582
 583         return ret;
 584 }
 585
 586 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 587                        int sg_cnt, struct srp_request *req,
 588                        struct srp_direct_buf *buf)
 589 {
 590         u64 io_addr = 0;
 591         u64 *dma_pages;
 592         u32 len;
 593         int page_cnt;
 594         int i, j;
 595         int ret;
 596         struct srp_device *dev = target->srp_host->dev;
 597         struct ib_device *ibdev = dev->dev;
 598
 599         if (!dev->fmr_pool)
 600                 return -ENODEV;
 601
 602         if ((ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask) &&
 603             mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, 3))
 604                 return -EINVAL;
 605
 606         len = page_cnt = 0;
 607         for (i = 0; i < sg_cnt; ++i) {
 608                 unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
 609
 610                 if (ib_sg_dma_address(ibdev, &scat[i]) & ~dev->fmr_page_mask) {
 611                         if (i > 0)
 612                                 return -EINVAL;
 613                         else
 614                                 ++page_cnt;
 615                 }
 616                 if ((ib_sg_dma_address(ibdev, &scat[i]) + dma_len) &
 617                     ~dev->fmr_page_mask) {
 618                         if (i < sg_cnt - 1)
 619                                 return -EINVAL;
 620                         else
 621                                 ++page_cnt;
 622                 }
 623
 624                 len += dma_len;
 625         }
 626
 627         page_cnt += len >> dev->fmr_page_shift;
 628         if (page_cnt > SRP_FMR_SIZE)
 629                 return -ENOMEM;
 630
 631         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 632         if (!dma_pages)
 633                 return -ENOMEM;
 634
 635         page_cnt = 0;
 636         for (i = 0; i < sg_cnt; ++i) {
 637                 unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
 638
 639                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 640                         dma_pages[page_cnt++] =
 641                                 (ib_sg_dma_address(ibdev, &scat[i]) &
 642                                  dev->fmr_page_mask) + j;
 643         }
 644
 645         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 646                                         dma_pages, page_cnt, io_addr);
 647         if (IS_ERR(req->fmr)) {
 648                 ret = PTR_ERR(req->fmr);
 649                 req->fmr = NULL;
 650                 goto out;
 651         }
 652
 653         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 654                                ~dev->fmr_page_mask);
 655         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 656         buf->len = cpu_to_be32(len);
 657
 658         ret = 0;
 659
 660 out:
 661         kfree(dma_pages);
 662
 663         return ret;
 664 }
 665
 666 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 667                         struct srp_request *req)
 668 {
 669         struct scatterlist *scat;
 670         struct srp_cmd *cmd = req->cmd->buf;
 671         int len, nents, count;
 672         u8 fmt = SRP_DATA_DESC_DIRECT;
 673         struct srp_device *dev;
 674         struct ib_device *ibdev;
 675
 676         if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
 677                 return sizeof (struct srp_cmd);
 678
 679         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 680             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 681                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 682                        scmnd->sc_data_direction);
 683                 return -EINVAL;
 684         }
 685
 686         /*
 687          * This handling of non-SG commands can be killed when the
 688          * SCSI midlayer no longer generates non-SG commands.
 689          */
 690         if (likely(scmnd->use_sg)) {
 691                 nents = scmnd->use_sg;
 692                 scat  = scmnd->request_buffer;
 693         } else {
 694                 nents = 1;
 695                 scat  = &req->fake_sg;
 696                 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
 697         }
 698
 699         dev = target->srp_host->dev;
 700         ibdev = dev->dev;
 701
 702         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 703
 704         fmt = SRP_DATA_DESC_DIRECT;
 705         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 706
 707         if (count == 1) {
 708                 /*
 709                  * The midlayer only generated a single gather/scatter
 710                  * entry, or DMA mapping coalesced everything to a
 711                  * single entry.  So a direct descriptor along with
 712                  * the DMA MR suffices.
 713                  */
 714                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 715
 716                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 717                 buf->key = cpu_to_be32(dev->mr->rkey);
 718                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 719         } else if (srp_map_fmr(target, scat, count, req,
 720                                (void *) cmd->add_data)) {
 721                 /*
 722                  * FMR mapping failed, and the scatterlist has more
 723                  * than one entry.  Generate an indirect memory
 724                  * descriptor.
 725                  */
 726                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 727                 u32 datalen = 0;
 728                 int i;
 729
 730                 fmt = SRP_DATA_DESC_INDIRECT;
 731                 len = sizeof (struct srp_cmd) +
 732                         sizeof (struct srp_indirect_buf) +
 733                         count * sizeof (struct srp_direct_buf);
 734
 735                 for (i = 0; i < count; ++i) {
 736                         unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
 737
 738                         buf->desc_list[i].va  =
 739                                 cpu_to_be64(ib_sg_dma_address(ibdev, &scat[i]));
 740                         buf->desc_list[i].key =
 741                                 cpu_to_be32(dev->mr->rkey);
 742                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 743                         datalen += dma_len;
 744                 }
 745
 746                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 747                         cmd->data_out_desc_cnt = count;
 748                 else
 749                         cmd->data_in_desc_cnt = count;
 750
 751                 buf->table_desc.va  =
 752                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 753                 buf->table_desc.key =
 754                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 755                 buf->table_desc.len =
 756                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 757
 758                 buf->len = cpu_to_be32(datalen);
 759         }
 760
 761         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 762                 cmd->buf_fmt = fmt << 4;
 763         else
 764                 cmd->buf_fmt = fmt;
 765
 766         return len;
 767 }
 768
 769 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 770 {
 771         struct srp_request *req;
 772         struct scsi_cmnd *scmnd;
 773         unsigned long flags;
 774         s32 delta;
 775
 776         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 777
 778         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 779
 780         target->req_lim += delta;
 781
 782         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 783
 784         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 785                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 786                         req->tsk_status = -1;
 787                 else
 788                         req->tsk_status = rsp->data[3];
 789                 complete(&req->done);
 790         } else {
 791                 scmnd = req->scmnd;
 792                 if (!scmnd)
 793                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 794                                (unsigned long long) rsp->tag);
 795                 scmnd->result = rsp->status;
 796
 797                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 798                         memcpy(scmnd->sense_buffer, rsp->data +
 799                                be32_to_cpu(rsp->resp_data_len),
 800                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 801                                      SCSI_SENSE_BUFFERSIZE));
 802                 }
 803
 804                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 805                         scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
 806                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 807                         scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
 808
 809                 if (!req->tsk_mgmt) {
 810                         scmnd->host_scribble = (void *) -1L;
 811                         scmnd->scsi_done(scmnd);
 812
 813                         srp_remove_req(target, req);
 814                 } else
 815                         req->cmd_done = 1;
 816         }
 817
 818         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 819 }
 820
 821 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 822 {
 823         struct ib_device *dev;
 824         struct srp_iu *iu;
 825         u8 opcode;
 826
 827         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 828
 829         dev = target->srp_host->dev->dev;
 830         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 831                                    DMA_FROM_DEVICE);
 832
 833         opcode = *(u8 *) iu->buf;
 834
 835         if (0) {
 836                 int i;
 837
 838                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 839
 840                 for (i = 0; i < wc->byte_len; ++i) {
 841                         if (i % 8 == 0)
 842                                 printk(KERN_ERR "  [%02x] ", i);
 843                         printk(" %02x", ((u8 *) iu->buf)[i]);
 844                         if ((i + 1) % 8 == 0)
 845                                 printk("\n");
 846                 }
 847
 848                 if (wc->byte_len % 8)
 849                         printk("\n");
 850         }
 851
 852         switch (opcode) {
 853         case SRP_RSP:
 854                 srp_process_rsp(target, iu->buf);
 855                 break;
 856
 857         case SRP_T_LOGOUT:
 858                 /* XXX Handle target logout */
 859                 printk(KERN_WARNING PFX "Got target logout request\n");
 860                 break;
 861
 862         default:
 863                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 864                 break;
 865         }
 866
 867         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 868                                       DMA_FROM_DEVICE);
 869 }
 870
 871 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 872 {
 873         struct srp_target_port *target = target_ptr;
 874         struct ib_wc wc;
 875
 876         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 877         while (ib_poll_cq(cq, 1, &wc) > 0) {
 878                 if (wc.status) {
 879                         printk(KERN_ERR PFX "failed %s status %d\n",
 880                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 881                                wc.status);
 882                         target->qp_in_error = 1;
 883                         break;
 884                 }
 885
 886                 if (wc.wr_id & SRP_OP_RECV)
 887                         srp_handle_recv(target, &wc);
 888                 else
 889                         ++target->tx_tail;
 890         }
 891 }
 892
 893 static int __srp_post_recv(struct srp_target_port *target)
 894 {
 895         struct srp_iu *iu;
 896         struct ib_sge list;
 897         struct ib_recv_wr wr, *bad_wr;
 898         unsigned int next;
 899         int ret;
 900
 901         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 902         wr.wr_id = next | SRP_OP_RECV;
 903         iu       = target->rx_ring[next];
 904
 905         list.addr   = iu->dma;
 906         list.length = iu->size;
 907         list.lkey   = target->srp_host->dev->mr->lkey;
 908
 909         wr.next     = NULL;
 910         wr.sg_list  = &list;
 911         wr.num_sge  = 1;
 912
 913         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 914         if (!ret)
 915                 ++target->rx_head;
 916
 917         return ret;
 918 }
 919
 920 static int srp_post_recv(struct srp_target_port *target)
 921 {
 922         unsigned long flags;
 923         int ret;
 924
 925         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 926         ret = __srp_post_recv(target);
 927         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 928
 929         return ret;
 930 }
 931
 932 /*
 933  * Must be called with target->scsi_host->host_lock held to protect
 934  * req_lim and tx_head.  Lock cannot be dropped between call here and
 935  * call to __srp_post_send().
 936  */
 937 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 938 {
 939         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 940                 return NULL;
 941
 942         if (unlikely(target->req_lim < 1))
 943                 ++target->zero_req_lim;
 944
 945         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 946 }
 947
 948 /*
 949  * Must be called with target->scsi_host->host_lock held to protect
 950  * req_lim and tx_head.
 951  */
 952 static int __srp_post_send(struct srp_target_port *target,
 953                            struct srp_iu *iu, int len)
 954 {
 955         struct ib_sge list;
 956         struct ib_send_wr wr, *bad_wr;
 957         int ret = 0;
 958
 959         list.addr   = iu->dma;
 960         list.length = len;
 961         list.lkey   = target->srp_host->dev->mr->lkey;
 962
 963         wr.next       = NULL;
 964         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 965         wr.sg_list    = &list;
 966         wr.num_sge    = 1;
 967         wr.opcode     = IB_WR_SEND;
 968         wr.send_flags = IB_SEND_SIGNALED;
 969
 970         ret = ib_post_send(target->qp, &wr, &bad_wr);
 971
 972         if (!ret) {
 973                 ++target->tx_head;
 974                 --target->req_lim;
 975         }
 976
 977         return ret;
 978 }
 979
 980 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 981                             void (*done)(struct scsi_cmnd *))
 982 {
 983         struct srp_target_port *target = host_to_target(scmnd->device->host);
 984         struct srp_request *req;
 985         struct srp_iu *iu;
 986         struct srp_cmd *cmd;
 987         struct ib_device *dev;
 988         int len;
 989
 990         if (target->state == SRP_TARGET_CONNECTING)
 991                 goto err;
 992
 993         if (target->state == SRP_TARGET_DEAD ||
 994             target->state == SRP_TARGET_REMOVED) {
 995                 scmnd->result = DID_BAD_TARGET << 16;
 996                 done(scmnd);
 997                 return 0;
 998         }
 999
1000         iu = __srp_get_tx_iu(target);
1001         if (!iu)
1002                 goto err;
1003
1004         dev = target->srp_host->dev->dev;
1005         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1006                                    DMA_TO_DEVICE);
1007
1008         req = list_entry(target->free_reqs.next, struct srp_request, list);
1009
1010         scmnd->scsi_done     = done;
1011         scmnd->result        = 0;
1012         scmnd->host_scribble = (void *) (long) req->index;
1013
1014         cmd = iu->buf;
1015         memset(cmd, 0, sizeof *cmd);
1016
1017         cmd->opcode = SRP_CMD;
1018         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1019         cmd->tag    = req->index;
1020         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1021
1022         req->scmnd    = scmnd;
1023         req->cmd      = iu;
1024         req->cmd_done = 0;
1025         req->tsk_mgmt = NULL;
1026
1027         len = srp_map_data(scmnd, target, req);
1028         if (len < 0) {
1029                 printk(KERN_ERR PFX "Failed to map data\n");
1030                 goto err;
1031         }
1032
1033         if (__srp_post_recv(target)) {
1034                 printk(KERN_ERR PFX "Recv failed\n");
1035                 goto err_unmap;
1036         }
1037
1038         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1039                                       DMA_TO_DEVICE);
1040
1041         if (__srp_post_send(target, iu, len)) {
1042                 printk(KERN_ERR PFX "Send failed\n");
1043                 goto err_unmap;
1044         }
1045
1046         list_move_tail(&req->list, &target->req_queue);
1047
1048         return 0;
1049
1050 err_unmap:
1051         srp_unmap_data(scmnd, target, req);
1052
1053 err:
1054         return SCSI_MLQUEUE_HOST_BUSY;
1055 }
1056
1057 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1058 {
1059         int i;
1060
1061         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1062                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1063                                                   target->max_ti_iu_len,
1064                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1065                 if (!target->rx_ring[i])
1066                         goto err;
1067         }
1068
1069         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1070                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1071                                                   srp_max_iu_len,
1072                                                   GFP_KERNEL, DMA_TO_DEVICE);
1073                 if (!target->tx_ring[i])
1074                         goto err;
1075         }
1076
1077         return 0;
1078
1079 err:
1080         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1081                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1082                 target->rx_ring[i] = NULL;
1083         }
1084
1085         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1086                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1087                 target->tx_ring[i] = NULL;
1088         }
1089
1090         return -ENOMEM;
1091 }
1092
1093 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1094                                struct ib_cm_event *event,
1095                                struct srp_target_port *target)
1096 {
1097         struct ib_class_port_info *cpi;
1098         int opcode;
1099
1100         switch (event->param.rej_rcvd.reason) {
1101         case IB_CM_REJ_PORT_CM_REDIRECT:
1102                 cpi = event->param.rej_rcvd.ari;
1103                 target->path.dlid = cpi->redirect_lid;
1104                 target->path.pkey = cpi->redirect_pkey;
1105                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1106                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1107
1108                 target->status = target->path.dlid ?
1109                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1110                 break;
1111
1112         case IB_CM_REJ_PORT_REDIRECT:
1113                 if (topspin_workarounds &&
1114                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1115                         /*
1116                          * Topspin/Cisco SRP gateways incorrectly send
1117                          * reject reason code 25 when they mean 24
1118                          * (port redirect).
1119                          */
1120                         memcpy(target->path.dgid.raw,
1121                                event->param.rej_rcvd.ari, 16);
1122
1123                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1124                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1125                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1126
1127                         target->status = SRP_PORT_REDIRECT;
1128                 } else {
1129                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1130                         target->status = -ECONNRESET;
1131                 }
1132                 break;
1133
1134         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1135                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1136                 target->status = -ECONNRESET;
1137                 break;
1138
1139         case IB_CM_REJ_CONSUMER_DEFINED:
1140                 opcode = *(u8 *) event->private_data;
1141                 if (opcode == SRP_LOGIN_REJ) {
1142                         struct srp_login_rej *rej = event->private_data;
1143                         u32 reason = be32_to_cpu(rej->reason);
1144
1145                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1146                                 printk(KERN_WARNING PFX
1147                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1148                         else
1149                                 printk(KERN_WARNING PFX
1150                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1151                 } else
1152                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1153                                " opcode 0x%02x\n", opcode);
1154                 target->status = -ECONNRESET;
1155                 break;
1156
1157         default:
1158                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1159                        event->param.rej_rcvd.reason);
1160                 target->status = -ECONNRESET;
1161         }
1162 }
1163
1164 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1165 {
1166         struct srp_target_port *target = cm_id->context;
1167         struct ib_qp_attr *qp_attr = NULL;
1168         int attr_mask = 0;
1169         int comp = 0;
1170         int opcode = 0;
1171
1172         switch (event->event) {
1173         case IB_CM_REQ_ERROR:
1174                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1175                 comp = 1;
1176                 target->status = -ECONNRESET;
1177                 break;
1178
1179         case IB_CM_REP_RECEIVED:
1180                 comp = 1;
1181                 opcode = *(u8 *) event->private_data;
1182
1183                 if (opcode == SRP_LOGIN_RSP) {
1184                         struct srp_login_rsp *rsp = event->private_data;
1185
1186                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1187                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1188
1189                         target->scsi_host->can_queue = min(target->req_lim,
1190                                                            target->scsi_host->can_queue);
1191                 } else {
1192                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1193                         target->status = -ECONNRESET;
1194                         break;
1195                 }
1196
1197                 if (!target->rx_ring[0]) {
1198                         target->status = srp_alloc_iu_bufs(target);
1199                         if (target->status)
1200                                 break;
1201                 }
1202
1203                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1204                 if (!qp_attr) {
1205                         target->status = -ENOMEM;
1206                         break;
1207                 }
1208
1209                 qp_attr->qp_state = IB_QPS_RTR;
1210                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1211                 if (target->status)
1212                         break;
1213
1214                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1215                 if (target->status)
1216                         break;
1217
1218                 target->status = srp_post_recv(target);
1219                 if (target->status)
1220                         break;
1221
1222                 qp_attr->qp_state = IB_QPS_RTS;
1223                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1224                 if (target->status)
1225                         break;
1226
1227                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1228                 if (target->status)
1229                         break;
1230
1231                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1232                 if (target->status)
1233                         break;
1234
1235                 break;
1236
1237         case IB_CM_REJ_RECEIVED:
1238                 printk(KERN_DEBUG PFX "REJ received\n");
1239                 comp = 1;
1240
1241                 srp_cm_rej_handler(cm_id, event, target);
1242                 break;
1243
1244         case IB_CM_DREQ_RECEIVED:
1245                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1246                 if (ib_send_cm_drep(cm_id, NULL, 0))
1247                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1248                 break;
1249
1250         case IB_CM_TIMEWAIT_EXIT:
1251                 printk(KERN_ERR PFX "connection closed\n");
1252
1253                 comp = 1;
1254                 target->status = 0;
1255                 break;
1256
1257         case IB_CM_MRA_RECEIVED:
1258         case IB_CM_DREQ_ERROR:
1259         case IB_CM_DREP_RECEIVED:
1260                 break;
1261
1262         default:
1263                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1264                 break;
1265         }
1266
1267         if (comp)
1268                 complete(&target->done);
1269
1270         kfree(qp_attr);
1271
1272         return 0;
1273 }
1274
1275 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1276                              struct srp_request *req, u8 func)
1277 {
1278         struct srp_iu *iu;
1279         struct srp_tsk_mgmt *tsk_mgmt;
1280
1281         spin_lock_irq(target->scsi_host->host_lock);
1282
1283         if (target->state == SRP_TARGET_DEAD ||
1284             target->state == SRP_TARGET_REMOVED) {
1285                 req->scmnd->result = DID_BAD_TARGET << 16;
1286                 goto out;
1287         }
1288
1289         init_completion(&req->done);
1290
1291         iu = __srp_get_tx_iu(target);
1292         if (!iu)
1293                 goto out;
1294
1295         tsk_mgmt = iu->buf;
1296         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1297
1298         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1299         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1300         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1301         tsk_mgmt->tsk_mgmt_func = func;
1302         tsk_mgmt->task_tag      = req->index;
1303
1304         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1305                 goto out;
1306
1307         req->tsk_mgmt = iu;
1308
1309         spin_unlock_irq(target->scsi_host->host_lock);
1310
1311         if (!wait_for_completion_timeout(&req->done,
1312                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1313                 return -1;
1314
1315         return 0;
1316
1317 out:
1318         spin_unlock_irq(target->scsi_host->host_lock);
1319         return -1;
1320 }
1321
1322 static int srp_find_req(struct srp_target_port *target,
1323                         struct scsi_cmnd *scmnd,
1324                         struct srp_request **req)
1325 {
1326         if (scmnd->host_scribble == (void *) -1L)
1327                 return -1;
1328
1329         *req = &target->req_ring[(long) scmnd->host_scribble];
1330
1331         return 0;
1332 }
1333
1334 static int srp_abort(struct scsi_cmnd *scmnd)
1335 {
1336         struct srp_target_port *target = host_to_target(scmnd->device->host);
1337         struct srp_request *req;
1338         int ret = SUCCESS;
1339
1340         printk(KERN_ERR "SRP abort called\n");
1341
1342         if (target->qp_in_error)
1343                 return FAILED;
1344         if (srp_find_req(target, scmnd, &req))
1345                 return FAILED;
1346         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1347                 return FAILED;
1348
1349         spin_lock_irq(target->scsi_host->host_lock);
1350
1351         if (req->cmd_done) {
1352                 srp_remove_req(target, req);
1353                 scmnd->scsi_done(scmnd);
1354         } else if (!req->tsk_status) {
1355                 srp_remove_req(target, req);
1356                 scmnd->result = DID_ABORT << 16;
1357         } else
1358                 ret = FAILED;
1359
1360         spin_unlock_irq(target->scsi_host->host_lock);
1361
1362         return ret;
1363 }
1364
1365 static int srp_reset_device(struct scsi_cmnd *scmnd)
1366 {
1367         struct srp_target_port *target = host_to_target(scmnd->device->host);
1368         struct srp_request *req, *tmp;
1369
1370         printk(KERN_ERR "SRP reset_device called\n");
1371
1372         if (target->qp_in_error)
1373                 return FAILED;
1374         if (srp_find_req(target, scmnd, &req))
1375                 return FAILED;
1376         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1377                 return FAILED;
1378         if (req->tsk_status)
1379                 return FAILED;
1380
1381         spin_lock_irq(target->scsi_host->host_lock);
1382
1383         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1384                 if (req->scmnd->device == scmnd->device)
1385                         srp_reset_req(target, req);
1386
1387         spin_unlock_irq(target->scsi_host->host_lock);
1388
1389         return SUCCESS;
1390 }
1391
1392 static int srp_reset_host(struct scsi_cmnd *scmnd)
1393 {
1394         struct srp_target_port *target = host_to_target(scmnd->device->host);
1395         int ret = FAILED;
1396
1397         printk(KERN_ERR PFX "SRP reset_host called\n");
1398
1399         if (!srp_reconnect_target(target))
1400                 ret = SUCCESS;
1401
1402         return ret;
1403 }
1404
1405 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1406 {
1407         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1408
1409         if (target->state == SRP_TARGET_DEAD ||
1410             target->state == SRP_TARGET_REMOVED)
1411                 return -ENODEV;
1412
1413         return sprintf(buf, "0x%016llx\n",
1414                        (unsigned long long) be64_to_cpu(target->id_ext));
1415 }
1416
1417 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1418 {
1419         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1420
1421         if (target->state == SRP_TARGET_DEAD ||
1422             target->state == SRP_TARGET_REMOVED)
1423                 return -ENODEV;
1424
1425         return sprintf(buf, "0x%016llx\n",
1426                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1427 }
1428
1429 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1430 {
1431         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1432
1433         if (target->state == SRP_TARGET_DEAD ||
1434             target->state == SRP_TARGET_REMOVED)
1435                 return -ENODEV;
1436
1437         return sprintf(buf, "0x%016llx\n",
1438                        (unsigned long long) be64_to_cpu(target->service_id));
1439 }
1440
1441 static ssize_t show_pkey(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, "0x%04x\n", be16_to_cpu(target->path.pkey));
1450 }
1451
1452 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1453 {
1454         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1455
1456         if (target->state == SRP_TARGET_DEAD ||
1457             target->state == SRP_TARGET_REMOVED)
1458                 return -ENODEV;
1459
1460         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1461                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1462                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1463                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1464                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1465                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1466                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1467                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1468                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1469 }
1470
1471 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1472 {
1473         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1474
1475         if (target->state == SRP_TARGET_DEAD ||
1476             target->state == SRP_TARGET_REMOVED)
1477                 return -ENODEV;
1478
1479         return sprintf(buf, "%d\n", target->zero_req_lim);
1480 }
1481
1482 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1483 {
1484         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1485
1486         return sprintf(buf, "%d\n", target->srp_host->port);
1487 }
1488
1489 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1490 {
1491         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1492
1493         return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1494 }
1495
1496 static CLASS_DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1497 static CLASS_DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1498 static CLASS_DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1499 static CLASS_DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1500 static CLASS_DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1501 static CLASS_DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1502 static CLASS_DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1503 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1504
1505 static struct class_device_attribute *srp_host_attrs[] = {
1506         &class_device_attr_id_ext,
1507         &class_device_attr_ioc_guid,
1508         &class_device_attr_service_id,
1509         &class_device_attr_pkey,
1510         &class_device_attr_dgid,
1511         &class_device_attr_zero_req_lim,
1512         &class_device_attr_local_ib_port,
1513         &class_device_attr_local_ib_device,
1514         NULL
1515 };
1516
1517 static struct scsi_host_template srp_template = {
1518         .module                         = THIS_MODULE,
1519         .name                           = DRV_NAME,
1520         .info                           = srp_target_info,
1521         .queuecommand                   = srp_queuecommand,
1522         .eh_abort_handler               = srp_abort,
1523         .eh_device_reset_handler        = srp_reset_device,
1524         .eh_host_reset_handler          = srp_reset_host,
1525         .can_queue                      = SRP_SQ_SIZE,
1526         .this_id                        = -1,
1527         .cmd_per_lun                    = SRP_SQ_SIZE,
1528         .use_clustering                 = ENABLE_CLUSTERING,
1529         .shost_attrs                    = srp_host_attrs
1530 };
1531
1532 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1533 {
1534         sprintf(target->target_name, "SRP.T10:%016llX",
1535                  (unsigned long long) be64_to_cpu(target->id_ext));
1536
1537         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1538                 return -ENODEV;
1539
1540         spin_lock(&host->target_lock);
1541         list_add_tail(&target->list, &host->target_list);
1542         spin_unlock(&host->target_lock);
1543
1544         target->state = SRP_TARGET_LIVE;
1545
1546         scsi_scan_target(&target->scsi_host->shost_gendev,
1547                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1548
1549         return 0;
1550 }
1551
1552 static void srp_release_class_dev(struct class_device *class_dev)
1553 {
1554         struct srp_host *host =
1555                 container_of(class_dev, struct srp_host, class_dev);
1556
1557         complete(&host->released);
1558 }
1559
1560 static struct class srp_class = {
1561         .name    = "infiniband_srp",
1562         .release = srp_release_class_dev
1563 };
1564
1565 /*
1566  * Target ports are added by writing
1567  *
1568  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1569  *     pkey=<P_Key>,service_id=<service ID>
1570  *
1571  * to the add_target sysfs attribute.
1572  */
1573 enum {
1574         SRP_OPT_ERR             = 0,
1575         SRP_OPT_ID_EXT          = 1 << 0,
1576         SRP_OPT_IOC_GUID        = 1 << 1,
1577         SRP_OPT_DGID            = 1 << 2,
1578         SRP_OPT_PKEY            = 1 << 3,
1579         SRP_OPT_SERVICE_ID      = 1 << 4,
1580         SRP_OPT_MAX_SECT        = 1 << 5,
1581         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1582         SRP_OPT_IO_CLASS        = 1 << 7,
1583         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1584         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1585                                    SRP_OPT_IOC_GUID     |
1586                                    SRP_OPT_DGID         |
1587                                    SRP_OPT_PKEY         |
1588                                    SRP_OPT_SERVICE_ID),
1589 };
1590
1591 static match_table_t srp_opt_tokens = {
1592         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1593         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1594         { SRP_OPT_DGID,                 "dgid=%s"               },
1595         { SRP_OPT_PKEY,                 "pkey=%x"               },
1596         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1597         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1598         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1599         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1600         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1601         { SRP_OPT_ERR,                  NULL                    }
1602 };
1603
1604 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1605 {
1606         char *options, *sep_opt;
1607         char *p;
1608         char dgid[3];
1609         substring_t args[MAX_OPT_ARGS];
1610         int opt_mask = 0;
1611         int token;
1612         int ret = -EINVAL;
1613         int i;
1614
1615         options = kstrdup(buf, GFP_KERNEL);
1616         if (!options)
1617                 return -ENOMEM;
1618
1619         sep_opt = options;
1620         while ((p = strsep(&sep_opt, ",")) != NULL) {
1621                 if (!*p)
1622                         continue;
1623
1624                 token = match_token(p, srp_opt_tokens, args);
1625                 opt_mask |= token;
1626
1627                 switch (token) {
1628                 case SRP_OPT_ID_EXT:
1629                         p = match_strdup(args);
1630                         if (!p) {
1631                                 ret = -ENOMEM;
1632                                 goto out;
1633                         }
1634                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1635                         kfree(p);
1636                         break;
1637
1638                 case SRP_OPT_IOC_GUID:
1639                         p = match_strdup(args);
1640                         if (!p) {
1641                                 ret = -ENOMEM;
1642                                 goto out;
1643                         }
1644                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1645                         kfree(p);
1646                         break;
1647
1648                 case SRP_OPT_DGID:
1649                         p = match_strdup(args);
1650                         if (!p) {
1651                                 ret = -ENOMEM;
1652                                 goto out;
1653                         }
1654                         if (strlen(p) != 32) {
1655                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1656                                 kfree(p);
1657                                 goto out;
1658                         }
1659
1660                         for (i = 0; i < 16; ++i) {
1661                                 strlcpy(dgid, p + i * 2, 3);
1662                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1663                         }
1664                         kfree(p);
1665                         break;
1666
1667                 case SRP_OPT_PKEY:
1668                         if (match_hex(args, &token)) {
1669                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1670                                 goto out;
1671                         }
1672                         target->path.pkey = cpu_to_be16(token);
1673                         break;
1674
1675                 case SRP_OPT_SERVICE_ID:
1676                         p = match_strdup(args);
1677                         if (!p) {
1678                                 ret = -ENOMEM;
1679                                 goto out;
1680                         }
1681                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1682                         kfree(p);
1683                         break;
1684
1685                 case SRP_OPT_MAX_SECT:
1686                         if (match_int(args, &token)) {
1687                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1688                                 goto out;
1689                         }
1690                         target->scsi_host->max_sectors = token;
1691                         break;
1692
1693                 case SRP_OPT_MAX_CMD_PER_LUN:
1694                         if (match_int(args, &token)) {
1695                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1696                                 goto out;
1697                         }
1698                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1699                         break;
1700
1701                 case SRP_OPT_IO_CLASS:
1702                         if (match_hex(args, &token)) {
1703                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1704                                 goto out;
1705                         }
1706                         if (token != SRP_REV10_IB_IO_CLASS &&
1707                             token != SRP_REV16A_IB_IO_CLASS) {
1708                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1709                                        " %x specified (use %x or %x).\n",
1710                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1711                                 goto out;
1712                         }
1713                         target->io_class = token;
1714                         break;
1715
1716                 case SRP_OPT_INITIATOR_EXT:
1717                         p = match_strdup(args);
1718                         if (!p) {
1719                                 ret = -ENOMEM;
1720                                 goto out;
1721                         }
1722                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1723                         kfree(p);
1724                         break;
1725
1726                 default:
1727                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1728                                "'%s' in target creation request\n", p);
1729                         goto out;
1730                 }
1731         }
1732
1733         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1734                 ret = 0;
1735         else
1736                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1737                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1738                             !(srp_opt_tokens[i].token & opt_mask))
1739                                 printk(KERN_WARNING PFX "target creation request is "
1740                                        "missing parameter '%s'\n",
1741                                        srp_opt_tokens[i].pattern);
1742
1743 out:
1744         kfree(options);
1745         return ret;
1746 }
1747
1748 static ssize_t srp_create_target(struct class_device *class_dev,
1749                                  const char *buf, size_t count)
1750 {
1751         struct srp_host *host =
1752                 container_of(class_dev, struct srp_host, class_dev);
1753         struct Scsi_Host *target_host;
1754         struct srp_target_port *target;
1755         int ret;
1756         int i;
1757
1758         target_host = scsi_host_alloc(&srp_template,
1759                                       sizeof (struct srp_target_port));
1760         if (!target_host)
1761                 return -ENOMEM;
1762
1763         target_host->max_lun     = SRP_MAX_LUN;
1764         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1765
1766         target = host_to_target(target_host);
1767
1768         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1769         target->scsi_host  = target_host;
1770         target->srp_host   = host;
1771
1772         INIT_LIST_HEAD(&target->free_reqs);
1773         INIT_LIST_HEAD(&target->req_queue);
1774         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1775                 target->req_ring[i].index = i;
1776                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1777         }
1778
1779         ret = srp_parse_options(buf, target);
1780         if (ret)
1781                 goto err;
1782
1783         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1784
1785         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1786                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1787                (unsigned long long) be64_to_cpu(target->id_ext),
1788                (unsigned long long) be64_to_cpu(target->ioc_guid),
1789                be16_to_cpu(target->path.pkey),
1790                (unsigned long long) be64_to_cpu(target->service_id),
1791                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1792                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1793                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1794                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1795                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1796                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1797                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1798                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1799
1800         ret = srp_create_target_ib(target);
1801         if (ret)
1802                 goto err;
1803
1804         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1805         if (IS_ERR(target->cm_id)) {
1806                 ret = PTR_ERR(target->cm_id);
1807                 goto err_free;
1808         }
1809
1810         target->qp_in_error = 0;
1811         ret = srp_connect_target(target);
1812         if (ret) {
1813                 printk(KERN_ERR PFX "Connection failed\n");
1814                 goto err_cm_id;
1815         }
1816
1817         ret = srp_add_target(host, target);
1818         if (ret)
1819                 goto err_disconnect;
1820
1821         return count;
1822
1823 err_disconnect:
1824         srp_disconnect_target(target);
1825
1826 err_cm_id:
1827         ib_destroy_cm_id(target->cm_id);
1828
1829 err_free:
1830         srp_free_target_ib(target);
1831
1832 err:
1833         scsi_host_put(target_host);
1834
1835         return ret;
1836 }
1837
1838 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1839
1840 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1841 {
1842         struct srp_host *host =
1843                 container_of(class_dev, struct srp_host, class_dev);
1844
1845         return sprintf(buf, "%s\n", host->dev->dev->name);
1846 }
1847
1848 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1849
1850 static ssize_t show_port(struct class_device *class_dev, char *buf)
1851 {
1852         struct srp_host *host =
1853                 container_of(class_dev, struct srp_host, class_dev);
1854
1855         return sprintf(buf, "%d\n", host->port);
1856 }
1857
1858 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1859
1860 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1861 {
1862         struct srp_host *host;
1863
1864         host = kzalloc(sizeof *host, GFP_KERNEL);
1865         if (!host)
1866                 return NULL;
1867
1868         INIT_LIST_HEAD(&host->target_list);
1869         spin_lock_init(&host->target_lock);
1870         init_completion(&host->released);
1871         host->dev  = device;
1872         host->port = port;
1873
1874         host->class_dev.class = &srp_class;
1875         host->class_dev.dev   = device->dev->dma_device;
1876         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1877                  device->dev->name, port);
1878
1879         if (class_device_register(&host->class_dev))
1880                 goto free_host;
1881         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1882                 goto err_class;
1883         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1884                 goto err_class;
1885         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1886                 goto err_class;
1887
1888         return host;
1889
1890 err_class:
1891         class_device_unregister(&host->class_dev);
1892
1893 free_host:
1894         kfree(host);
1895
1896         return NULL;
1897 }
1898
1899 static void srp_add_one(struct ib_device *device)
1900 {
1901         struct srp_device *srp_dev;
1902         struct ib_device_attr *dev_attr;
1903         struct ib_fmr_pool_param fmr_param;
1904         struct srp_host *host;
1905         int s, e, p;
1906
1907         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1908         if (!dev_attr)
1909                 return;
1910
1911         if (ib_query_device(device, dev_attr)) {
1912                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1913                        device->name);
1914                 goto free_attr;
1915         }
1916
1917         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1918         if (!srp_dev)
1919                 goto free_attr;
1920
1921         /*
1922          * Use the smallest page size supported by the HCA, down to a
1923          * minimum of 512 bytes (which is the smallest sector that a
1924          * SCSI command will ever carry).
1925          */
1926         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1927         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1928         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
1929
1930         INIT_LIST_HEAD(&srp_dev->dev_list);
1931
1932         srp_dev->dev = device;
1933         srp_dev->pd  = ib_alloc_pd(device);
1934         if (IS_ERR(srp_dev->pd))
1935                 goto free_dev;
1936
1937         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1938                                     IB_ACCESS_LOCAL_WRITE |
1939                                     IB_ACCESS_REMOTE_READ |
1940                                     IB_ACCESS_REMOTE_WRITE);
1941         if (IS_ERR(srp_dev->mr))
1942                 goto err_pd;
1943
1944         memset(&fmr_param, 0, sizeof fmr_param);
1945         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1946         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1947         fmr_param.cache             = 1;
1948         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1949         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1950         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1951                                        IB_ACCESS_REMOTE_WRITE |
1952                                        IB_ACCESS_REMOTE_READ);
1953
1954         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1955         if (IS_ERR(srp_dev->fmr_pool))
1956                 srp_dev->fmr_pool = NULL;
1957
1958         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1959                 s = 0;
1960                 e = 0;
1961         } else {
1962                 s = 1;
1963                 e = device->phys_port_cnt;
1964         }
1965
1966         for (p = s; p <= e; ++p) {
1967                 host = srp_add_port(srp_dev, p);
1968                 if (host)
1969                         list_add_tail(&host->list, &srp_dev->dev_list);
1970         }
1971
1972         ib_set_client_data(device, &srp_client, srp_dev);
1973
1974         goto free_attr;
1975
1976 err_pd:
1977         ib_dealloc_pd(srp_dev->pd);
1978
1979 free_dev:
1980         kfree(srp_dev);
1981
1982 free_attr:
1983         kfree(dev_attr);
1984 }
1985
1986 static void srp_remove_one(struct ib_device *device)
1987 {
1988         struct srp_device *srp_dev;
1989         struct srp_host *host, *tmp_host;
1990         LIST_HEAD(target_list);
1991         struct srp_target_port *target, *tmp_target;
1992
1993         srp_dev = ib_get_client_data(device, &srp_client);
1994
1995         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1996                 class_device_unregister(&host->class_dev);
1997                 /*
1998                  * Wait for the sysfs entry to go away, so that no new
1999                  * target ports can be created.
2000                  */
2001                 wait_for_completion(&host->released);
2002
2003                 /*
2004                  * Mark all target ports as removed, so we stop queueing
2005                  * commands and don't try to reconnect.
2006                  */
2007                 spin_lock(&host->target_lock);
2008                 list_for_each_entry(target, &host->target_list, list) {
2009                         spin_lock_irq(target->scsi_host->host_lock);
2010                         target->state = SRP_TARGET_REMOVED;
2011                         spin_unlock_irq(target->scsi_host->host_lock);
2012                 }
2013                 spin_unlock(&host->target_lock);
2014
2015                 /*
2016                  * Wait for any reconnection tasks that may have
2017                  * started before we marked our target ports as
2018                  * removed, and any target port removal tasks.
2019                  */
2020                 flush_scheduled_work();
2021
2022                 list_for_each_entry_safe(target, tmp_target,
2023                                          &host->target_list, list) {
2024                         scsi_remove_host(target->scsi_host);
2025                         srp_disconnect_target(target);
2026                         ib_destroy_cm_id(target->cm_id);
2027                         srp_free_target_ib(target);
2028                         scsi_host_put(target->scsi_host);
2029                 }
2030
2031                 kfree(host);
2032         }
2033
2034         if (srp_dev->fmr_pool)
2035                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2036         ib_dereg_mr(srp_dev->mr);
2037         ib_dealloc_pd(srp_dev->pd);
2038
2039         kfree(srp_dev);
2040 }
2041
2042 static int __init srp_init_module(void)
2043 {
2044         int ret;
2045
2046         srp_template.sg_tablesize = srp_sg_tablesize;
2047         srp_max_iu_len = (sizeof (struct srp_cmd) +
2048                           sizeof (struct srp_indirect_buf) +
2049                           srp_sg_tablesize * 16);
2050
2051         ret = class_register(&srp_class);
2052         if (ret) {
2053                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2054                 return ret;
2055         }
2056
2057         ib_sa_register_client(&srp_sa_client);
2058
2059         ret = ib_register_client(&srp_client);
2060         if (ret) {
2061                 printk(KERN_ERR PFX "couldn't register IB client\n");
2062                 ib_sa_unregister_client(&srp_sa_client);
2063                 class_unregister(&srp_class);
2064                 return ret;
2065         }
2066
2067         return 0;
2068 }
2069
2070 static void __exit srp_cleanup_module(void)
2071 {
2072         ib_unregister_client(&srp_client);
2073         ib_sa_unregister_client(&srp_sa_client);
2074         class_unregister(&srp_class);
2075 }
2076
2077 module_init(srp_init_module);
2078 module_exit(srp_cleanup_module);