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 #include <scsi/scsi_transport_srp.h>
  51
  52 #include <rdma/ib_cache.h>
  53
  54 #include "ib_srp.h"
  55
  56 #define DRV_NAME        "ib_srp"
  57 #define PFX             DRV_NAME ": "
  58 #define DRV_VERSION     "0.2"
  59 #define DRV_RELDATE     "November 1, 2005"
  60
  61 MODULE_AUTHOR("Roland Dreier");
  62 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
  63                    "v" DRV_VERSION " (" DRV_RELDATE ")");
  64 MODULE_LICENSE("Dual BSD/GPL");
  65
  66 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
  67 static int srp_max_iu_len;
  68
  69 module_param(srp_sg_tablesize, int, 0444);
  70 MODULE_PARM_DESC(srp_sg_tablesize,
  71                  "Max number of gather/scatter entries per I/O (default is 12)");
  72
  73 static int topspin_workarounds = 1;
  74
  75 module_param(topspin_workarounds, int, 0444);
  76 MODULE_PARM_DESC(topspin_workarounds,
  77                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
  78
  79 static int mellanox_workarounds = 1;
  80
  81 module_param(mellanox_workarounds, int, 0444);
  82 MODULE_PARM_DESC(mellanox_workarounds,
  83                  "Enable workarounds for Mellanox SRP target bugs if != 0");
  84
  85 static void srp_add_one(struct ib_device *device);
  86 static void srp_remove_one(struct ib_device *device);
  87 static void srp_completion(struct ib_cq *cq, void *target_ptr);
  88 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
  89
  90 static struct scsi_transport_template *ib_srp_transport_template;
  91
  92 static struct ib_client srp_client = {
  93         .name   = "srp",
  94         .add    = srp_add_one,
  95         .remove = srp_remove_one
  96 };
  97
  98 static struct ib_sa_client srp_sa_client;
  99
 100 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
 101 {
 102         return (struct srp_target_port *) host->hostdata;
 103 }
 104
 105 static const char *srp_target_info(struct Scsi_Host *host)
 106 {
 107         return host_to_target(host)->target_name;
 108 }
 109
 110 static int srp_target_is_topspin(struct srp_target_port *target)
 111 {
 112         static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
 113         static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
 114
 115         return topspin_workarounds &&
 116                 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
 117                  !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
 118 }
 119
 120 static int srp_target_is_mellanox(struct srp_target_port *target)
 121 {
 122         static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
 123
 124         return mellanox_workarounds &&
 125                 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
 126 }
 127
 128 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
 129                                    gfp_t gfp_mask,
 130                                    enum dma_data_direction direction)
 131 {
 132         struct srp_iu *iu;
 133
 134         iu = kmalloc(sizeof *iu, gfp_mask);
 135         if (!iu)
 136                 goto out;
 137
 138         iu->buf = kzalloc(size, gfp_mask);
 139         if (!iu->buf)
 140                 goto out_free_iu;
 141
 142         iu->dma = ib_dma_map_single(host->dev->dev, iu->buf, size, direction);
 143         if (ib_dma_mapping_error(host->dev->dev, iu->dma))
 144                 goto out_free_buf;
 145
 146         iu->size      = size;
 147         iu->direction = direction;
 148
 149         return iu;
 150
 151 out_free_buf:
 152         kfree(iu->buf);
 153 out_free_iu:
 154         kfree(iu);
 155 out:
 156         return NULL;
 157 }
 158
 159 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
 160 {
 161         if (!iu)
 162                 return;
 163
 164         ib_dma_unmap_single(host->dev->dev, iu->dma, iu->size, iu->direction);
 165         kfree(iu->buf);
 166         kfree(iu);
 167 }
 168
 169 static void srp_qp_event(struct ib_event *event, void *context)
 170 {
 171         printk(KERN_ERR PFX "QP event %d\n", event->event);
 172 }
 173
 174 static int srp_init_qp(struct srp_target_port *target,
 175                        struct ib_qp *qp)
 176 {
 177         struct ib_qp_attr *attr;
 178         int ret;
 179
 180         attr = kmalloc(sizeof *attr, GFP_KERNEL);
 181         if (!attr)
 182                 return -ENOMEM;
 183
 184         ret = ib_find_cached_pkey(target->srp_host->dev->dev,
 185                                   target->srp_host->port,
 186                                   be16_to_cpu(target->path.pkey),
 187                                   &attr->pkey_index);
 188         if (ret)
 189                 goto out;
 190
 191         attr->qp_state        = IB_QPS_INIT;
 192         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
 193                                     IB_ACCESS_REMOTE_WRITE);
 194         attr->port_num        = target->srp_host->port;
 195
 196         ret = ib_modify_qp(qp, attr,
 197                            IB_QP_STATE          |
 198                            IB_QP_PKEY_INDEX     |
 199                            IB_QP_ACCESS_FLAGS   |
 200                            IB_QP_PORT);
 201
 202 out:
 203         kfree(attr);
 204         return ret;
 205 }
 206
 207 static int srp_create_target_ib(struct srp_target_port *target)
 208 {
 209         struct ib_qp_init_attr *init_attr;
 210         int ret;
 211
 212         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
 213         if (!init_attr)
 214                 return -ENOMEM;
 215
 216         target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
 217                                   NULL, target, SRP_CQ_SIZE, 0);
 218         if (IS_ERR(target->cq)) {
 219                 ret = PTR_ERR(target->cq);
 220                 goto out;
 221         }
 222
 223         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
 224
 225         init_attr->event_handler       = srp_qp_event;
 226         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
 227         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
 228         init_attr->cap.max_recv_sge    = 1;
 229         init_attr->cap.max_send_sge    = 1;
 230         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
 231         init_attr->qp_type             = IB_QPT_RC;
 232         init_attr->send_cq             = target->cq;
 233         init_attr->recv_cq             = target->cq;
 234
 235         target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
 236         if (IS_ERR(target->qp)) {
 237                 ret = PTR_ERR(target->qp);
 238                 ib_destroy_cq(target->cq);
 239                 goto out;
 240         }
 241
 242         ret = srp_init_qp(target, target->qp);
 243         if (ret) {
 244                 ib_destroy_qp(target->qp);
 245                 ib_destroy_cq(target->cq);
 246                 goto out;
 247         }
 248
 249 out:
 250         kfree(init_attr);
 251         return ret;
 252 }
 253
 254 static void srp_free_target_ib(struct srp_target_port *target)
 255 {
 256         int i;
 257
 258         ib_destroy_qp(target->qp);
 259         ib_destroy_cq(target->cq);
 260
 261         for (i = 0; i < SRP_RQ_SIZE; ++i)
 262                 srp_free_iu(target->srp_host, target->rx_ring[i]);
 263         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
 264                 srp_free_iu(target->srp_host, target->tx_ring[i]);
 265 }
 266
 267 static void srp_path_rec_completion(int status,
 268                                     struct ib_sa_path_rec *pathrec,
 269                                     void *target_ptr)
 270 {
 271         struct srp_target_port *target = target_ptr;
 272
 273         target->status = status;
 274         if (status)
 275                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
 276         else
 277                 target->path = *pathrec;
 278         complete(&target->done);
 279 }
 280
 281 static int srp_lookup_path(struct srp_target_port *target)
 282 {
 283         target->path.numb_path = 1;
 284
 285         init_completion(&target->done);
 286
 287         target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
 288                                                    target->srp_host->dev->dev,
 289                                                    target->srp_host->port,
 290                                                    &target->path,
 291                                                    IB_SA_PATH_REC_SERVICE_ID    |
 292                                                    IB_SA_PATH_REC_DGID          |
 293                                                    IB_SA_PATH_REC_SGID          |
 294                                                    IB_SA_PATH_REC_NUMB_PATH     |
 295                                                    IB_SA_PATH_REC_PKEY,
 296                                                    SRP_PATH_REC_TIMEOUT_MS,
 297                                                    GFP_KERNEL,
 298                                                    srp_path_rec_completion,
 299                                                    target, &target->path_query);
 300         if (target->path_query_id < 0)
 301                 return target->path_query_id;
 302
 303         wait_for_completion(&target->done);
 304
 305         if (target->status < 0)
 306                 printk(KERN_WARNING PFX "Path record query failed\n");
 307
 308         return target->status;
 309 }
 310
 311 static int srp_send_req(struct srp_target_port *target)
 312 {
 313         struct {
 314                 struct ib_cm_req_param param;
 315                 struct srp_login_req   priv;
 316         } *req = NULL;
 317         int status;
 318
 319         req = kzalloc(sizeof *req, GFP_KERNEL);
 320         if (!req)
 321                 return -ENOMEM;
 322
 323         req->param.primary_path               = &target->path;
 324         req->param.alternate_path             = NULL;
 325         req->param.service_id                 = target->service_id;
 326         req->param.qp_num                     = target->qp->qp_num;
 327         req->param.qp_type                    = target->qp->qp_type;
 328         req->param.private_data               = &req->priv;
 329         req->param.private_data_len           = sizeof req->priv;
 330         req->param.flow_control               = 1;
 331
 332         get_random_bytes(&req->param.starting_psn, 4);
 333         req->param.starting_psn              &= 0xffffff;
 334
 335         /*
 336          * Pick some arbitrary defaults here; we could make these
 337          * module parameters if anyone cared about setting them.
 338          */
 339         req->param.responder_resources        = 4;
 340         req->param.remote_cm_response_timeout = 20;
 341         req->param.local_cm_response_timeout  = 20;
 342         req->param.retry_count                = 7;
 343         req->param.rnr_retry_count            = 7;
 344         req->param.max_cm_retries             = 15;
 345
 346         req->priv.opcode        = SRP_LOGIN_REQ;
 347         req->priv.tag           = 0;
 348         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
 349         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
 350                                               SRP_BUF_FORMAT_INDIRECT);
 351         /*
 352          * In the published SRP specification (draft rev. 16a), the
 353          * port identifier format is 8 bytes of ID extension followed
 354          * by 8 bytes of GUID.  Older drafts put the two halves in the
 355          * opposite order, so that the GUID comes first.
 356          *
 357          * Targets conforming to these obsolete drafts can be
 358          * recognized by the I/O Class they report.
 359          */
 360         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
 361                 memcpy(req->priv.initiator_port_id,
 362                        &target->path.sgid.global.interface_id, 8);
 363                 memcpy(req->priv.initiator_port_id + 8,
 364                        &target->initiator_ext, 8);
 365                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
 366                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
 367         } else {
 368                 memcpy(req->priv.initiator_port_id,
 369                        &target->initiator_ext, 8);
 370                 memcpy(req->priv.initiator_port_id + 8,
 371                        &target->path.sgid.global.interface_id, 8);
 372                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
 373                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
 374         }
 375
 376         /*
 377          * Topspin/Cisco SRP targets will reject our login unless we
 378          * zero out the first 8 bytes of our initiator port ID and set
 379          * the second 8 bytes to the local node GUID.
 380          */
 381         if (srp_target_is_topspin(target)) {
 382                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
 383                        "activated for target GUID %016llx\n",
 384                        (unsigned long long) be64_to_cpu(target->ioc_guid));
 385                 memset(req->priv.initiator_port_id, 0, 8);
 386                 memcpy(req->priv.initiator_port_id + 8,
 387                        &target->srp_host->dev->dev->node_guid, 8);
 388         }
 389
 390         status = ib_send_cm_req(target->cm_id, &req->param);
 391
 392         kfree(req);
 393
 394         return status;
 395 }
 396
 397 static void srp_disconnect_target(struct srp_target_port *target)
 398 {
 399         /* XXX should send SRP_I_LOGOUT request */
 400
 401         init_completion(&target->done);
 402         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
 403                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
 404                 return;
 405         }
 406         wait_for_completion(&target->done);
 407 }
 408
 409 static void srp_remove_work(struct work_struct *work)
 410 {
 411         struct srp_target_port *target =
 412                 container_of(work, struct srp_target_port, work);
 413
 414         spin_lock_irq(target->scsi_host->host_lock);
 415         if (target->state != SRP_TARGET_DEAD) {
 416                 spin_unlock_irq(target->scsi_host->host_lock);
 417                 return;
 418         }
 419         target->state = SRP_TARGET_REMOVED;
 420         spin_unlock_irq(target->scsi_host->host_lock);
 421
 422         spin_lock(&target->srp_host->target_lock);
 423         list_del(&target->list);
 424         spin_unlock(&target->srp_host->target_lock);
 425
 426         srp_remove_host(target->scsi_host);
 427         scsi_remove_host(target->scsi_host);
 428         ib_destroy_cm_id(target->cm_id);
 429         srp_free_target_ib(target);
 430         scsi_host_put(target->scsi_host);
 431 }
 432
 433 static int srp_connect_target(struct srp_target_port *target)
 434 {
 435         int ret;
 436
 437         ret = srp_lookup_path(target);
 438         if (ret)
 439                 return ret;
 440
 441         while (1) {
 442                 init_completion(&target->done);
 443                 ret = srp_send_req(target);
 444                 if (ret)
 445                         return ret;
 446                 wait_for_completion(&target->done);
 447
 448                 /*
 449                  * The CM event handling code will set status to
 450                  * SRP_PORT_REDIRECT if we get a port redirect REJ
 451                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
 452                  * redirect REJ back.
 453                  */
 454                 switch (target->status) {
 455                 case 0:
 456                         return 0;
 457
 458                 case SRP_PORT_REDIRECT:
 459                         ret = srp_lookup_path(target);
 460                         if (ret)
 461                                 return ret;
 462                         break;
 463
 464                 case SRP_DLID_REDIRECT:
 465                         break;
 466
 467                 default:
 468                         return target->status;
 469                 }
 470         }
 471 }
 472
 473 static void srp_unmap_data(struct scsi_cmnd *scmnd,
 474                            struct srp_target_port *target,
 475                            struct srp_request *req)
 476 {
 477         if (!scsi_sglist(scmnd) ||
 478             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
 479              scmnd->sc_data_direction != DMA_FROM_DEVICE))
 480                 return;
 481
 482         if (req->fmr) {
 483                 ib_fmr_pool_unmap(req->fmr);
 484                 req->fmr = NULL;
 485         }
 486
 487         ib_dma_unmap_sg(target->srp_host->dev->dev, scsi_sglist(scmnd),
 488                         scsi_sg_count(scmnd), scmnd->sc_data_direction);
 489 }
 490
 491 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
 492 {
 493         srp_unmap_data(req->scmnd, target, req);
 494         list_move_tail(&req->list, &target->free_reqs);
 495 }
 496
 497 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
 498 {
 499         req->scmnd->result = DID_RESET << 16;
 500         req->scmnd->scsi_done(req->scmnd);
 501         srp_remove_req(target, req);
 502 }
 503
 504 static int srp_reconnect_target(struct srp_target_port *target)
 505 {
 506         struct ib_cm_id *new_cm_id;
 507         struct ib_qp_attr qp_attr;
 508         struct srp_request *req, *tmp;
 509         struct ib_wc wc;
 510         int ret;
 511
 512         spin_lock_irq(target->scsi_host->host_lock);
 513         if (target->state != SRP_TARGET_LIVE) {
 514                 spin_unlock_irq(target->scsi_host->host_lock);
 515                 return -EAGAIN;
 516         }
 517         target->state = SRP_TARGET_CONNECTING;
 518         spin_unlock_irq(target->scsi_host->host_lock);
 519
 520         srp_disconnect_target(target);
 521         /*
 522          * Now get a new local CM ID so that we avoid confusing the
 523          * target in case things are really fouled up.
 524          */
 525         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
 526                                     srp_cm_handler, target);
 527         if (IS_ERR(new_cm_id)) {
 528                 ret = PTR_ERR(new_cm_id);
 529                 goto err;
 530         }
 531         ib_destroy_cm_id(target->cm_id);
 532         target->cm_id = new_cm_id;
 533
 534         qp_attr.qp_state = IB_QPS_RESET;
 535         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
 536         if (ret)
 537                 goto err;
 538
 539         ret = srp_init_qp(target, target->qp);
 540         if (ret)
 541                 goto err;
 542
 543         while (ib_poll_cq(target->cq, 1, &wc) > 0)
 544                 ; /* nothing */
 545
 546         spin_lock_irq(target->scsi_host->host_lock);
 547         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
 548                 srp_reset_req(target, req);
 549         spin_unlock_irq(target->scsi_host->host_lock);
 550
 551         target->rx_head  = 0;
 552         target->tx_head  = 0;
 553         target->tx_tail  = 0;
 554
 555         target->qp_in_error = 0;
 556         ret = srp_connect_target(target);
 557         if (ret)
 558                 goto err;
 559
 560         spin_lock_irq(target->scsi_host->host_lock);
 561         if (target->state == SRP_TARGET_CONNECTING) {
 562                 ret = 0;
 563                 target->state = SRP_TARGET_LIVE;
 564         } else
 565                 ret = -EAGAIN;
 566         spin_unlock_irq(target->scsi_host->host_lock);
 567
 568         return ret;
 569
 570 err:
 571         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
 572
 573         /*
 574          * We couldn't reconnect, so kill our target port off.
 575          * However, we have to defer the real removal because we might
 576          * be in the context of the SCSI error handler now, which
 577          * would deadlock if we call scsi_remove_host().
 578          */
 579         spin_lock_irq(target->scsi_host->host_lock);
 580         if (target->state == SRP_TARGET_CONNECTING) {
 581                 target->state = SRP_TARGET_DEAD;
 582                 INIT_WORK(&target->work, srp_remove_work);
 583                 schedule_work(&target->work);
 584         }
 585         spin_unlock_irq(target->scsi_host->host_lock);
 586
 587         return ret;
 588 }
 589
 590 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
 591                        int sg_cnt, struct srp_request *req,
 592                        struct srp_direct_buf *buf)
 593 {
 594         u64 io_addr = 0;
 595         u64 *dma_pages;
 596         u32 len;
 597         int page_cnt;
 598         int i, j;
 599         int ret;
 600         struct srp_device *dev = target->srp_host->dev;
 601         struct ib_device *ibdev = dev->dev;
 602         struct scatterlist *sg;
 603
 604         if (!dev->fmr_pool)
 605                 return -ENODEV;
 606
 607         if (srp_target_is_mellanox(target) &&
 608             (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
 609                 return -EINVAL;
 610
 611         len = page_cnt = 0;
 612         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 613                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 614
 615                 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
 616                         if (i > 0)
 617                                 return -EINVAL;
 618                         else
 619                                 ++page_cnt;
 620                 }
 621                 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
 622                     ~dev->fmr_page_mask) {
 623                         if (i < sg_cnt - 1)
 624                                 return -EINVAL;
 625                         else
 626                                 ++page_cnt;
 627                 }
 628
 629                 len += dma_len;
 630         }
 631
 632         page_cnt += len >> dev->fmr_page_shift;
 633         if (page_cnt > SRP_FMR_SIZE)
 634                 return -ENOMEM;
 635
 636         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
 637         if (!dma_pages)
 638                 return -ENOMEM;
 639
 640         page_cnt = 0;
 641         scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
 642                 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 643
 644                 for (j = 0; j < dma_len; j += dev->fmr_page_size)
 645                         dma_pages[page_cnt++] =
 646                                 (ib_sg_dma_address(ibdev, sg) &
 647                                  dev->fmr_page_mask) + j;
 648         }
 649
 650         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
 651                                         dma_pages, page_cnt, io_addr);
 652         if (IS_ERR(req->fmr)) {
 653                 ret = PTR_ERR(req->fmr);
 654                 req->fmr = NULL;
 655                 goto out;
 656         }
 657
 658         buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
 659                                ~dev->fmr_page_mask);
 660         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
 661         buf->len = cpu_to_be32(len);
 662
 663         ret = 0;
 664
 665 out:
 666         kfree(dma_pages);
 667
 668         return ret;
 669 }
 670
 671 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
 672                         struct srp_request *req)
 673 {
 674         struct scatterlist *scat;
 675         struct srp_cmd *cmd = req->cmd->buf;
 676         int len, nents, count;
 677         u8 fmt = SRP_DATA_DESC_DIRECT;
 678         struct srp_device *dev;
 679         struct ib_device *ibdev;
 680
 681         if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
 682                 return sizeof (struct srp_cmd);
 683
 684         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
 685             scmnd->sc_data_direction != DMA_TO_DEVICE) {
 686                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
 687                        scmnd->sc_data_direction);
 688                 return -EINVAL;
 689         }
 690
 691         nents = scsi_sg_count(scmnd);
 692         scat  = scsi_sglist(scmnd);
 693
 694         dev = target->srp_host->dev;
 695         ibdev = dev->dev;
 696
 697         count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
 698
 699         fmt = SRP_DATA_DESC_DIRECT;
 700         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 701
 702         if (count == 1) {
 703                 /*
 704                  * The midlayer only generated a single gather/scatter
 705                  * entry, or DMA mapping coalesced everything to a
 706                  * single entry.  So a direct descriptor along with
 707                  * the DMA MR suffices.
 708                  */
 709                 struct srp_direct_buf *buf = (void *) cmd->add_data;
 710
 711                 buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
 712                 buf->key = cpu_to_be32(dev->mr->rkey);
 713                 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 714         } else if (srp_map_fmr(target, scat, count, req,
 715                                (void *) cmd->add_data)) {
 716                 /*
 717                  * FMR mapping failed, and the scatterlist has more
 718                  * than one entry.  Generate an indirect memory
 719                  * descriptor.
 720                  */
 721                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
 722                 struct scatterlist *sg;
 723                 u32 datalen = 0;
 724                 int i;
 725
 726                 fmt = SRP_DATA_DESC_INDIRECT;
 727                 len = sizeof (struct srp_cmd) +
 728                         sizeof (struct srp_indirect_buf) +
 729                         count * sizeof (struct srp_direct_buf);
 730
 731                 scsi_for_each_sg(scmnd, sg, count, i) {
 732                         unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
 733
 734                         buf->desc_list[i].va  =
 735                                 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
 736                         buf->desc_list[i].key =
 737                                 cpu_to_be32(dev->mr->rkey);
 738                         buf->desc_list[i].len = cpu_to_be32(dma_len);
 739                         datalen += dma_len;
 740                 }
 741
 742                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 743                         cmd->data_out_desc_cnt = count;
 744                 else
 745                         cmd->data_in_desc_cnt = count;
 746
 747                 buf->table_desc.va  =
 748                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
 749                 buf->table_desc.key =
 750                         cpu_to_be32(target->srp_host->dev->mr->rkey);
 751                 buf->table_desc.len =
 752                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
 753
 754                 buf->len = cpu_to_be32(datalen);
 755         }
 756
 757         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
 758                 cmd->buf_fmt = fmt << 4;
 759         else
 760                 cmd->buf_fmt = fmt;
 761
 762         return len;
 763 }
 764
 765 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 766 {
 767         struct srp_request *req;
 768         struct scsi_cmnd *scmnd;
 769         unsigned long flags;
 770         s32 delta;
 771
 772         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
 773
 774         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 775
 776         target->req_lim += delta;
 777
 778         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
 779
 780         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
 781                 if (be32_to_cpu(rsp->resp_data_len) < 4)
 782                         req->tsk_status = -1;
 783                 else
 784                         req->tsk_status = rsp->data[3];
 785                 complete(&req->done);
 786         } else {
 787                 scmnd = req->scmnd;
 788                 if (!scmnd)
 789                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
 790                                (unsigned long long) rsp->tag);
 791                 scmnd->result = rsp->status;
 792
 793                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
 794                         memcpy(scmnd->sense_buffer, rsp->data +
 795                                be32_to_cpu(rsp->resp_data_len),
 796                                min_t(int, be32_to_cpu(rsp->sense_data_len),
 797                                      SCSI_SENSE_BUFFERSIZE));
 798                 }
 799
 800                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
 801                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
 802                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
 803                         scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
 804
 805                 if (!req->tsk_mgmt) {
 806                         scmnd->host_scribble = (void *) -1L;
 807                         scmnd->scsi_done(scmnd);
 808
 809                         srp_remove_req(target, req);
 810                 } else
 811                         req->cmd_done = 1;
 812         }
 813
 814         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 815 }
 816
 817 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
 818 {
 819         struct ib_device *dev;
 820         struct srp_iu *iu;
 821         u8 opcode;
 822
 823         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
 824
 825         dev = target->srp_host->dev->dev;
 826         ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
 827                                    DMA_FROM_DEVICE);
 828
 829         opcode = *(u8 *) iu->buf;
 830
 831         if (0) {
 832                 int i;
 833
 834                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
 835
 836                 for (i = 0; i < wc->byte_len; ++i) {
 837                         if (i % 8 == 0)
 838                                 printk(KERN_ERR "  [%02x] ", i);
 839                         printk(" %02x", ((u8 *) iu->buf)[i]);
 840                         if ((i + 1) % 8 == 0)
 841                                 printk("\n");
 842                 }
 843
 844                 if (wc->byte_len % 8)
 845                         printk("\n");
 846         }
 847
 848         switch (opcode) {
 849         case SRP_RSP:
 850                 srp_process_rsp(target, iu->buf);
 851                 break;
 852
 853         case SRP_T_LOGOUT:
 854                 /* XXX Handle target logout */
 855                 printk(KERN_WARNING PFX "Got target logout request\n");
 856                 break;
 857
 858         default:
 859                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
 860                 break;
 861         }
 862
 863         ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
 864                                       DMA_FROM_DEVICE);
 865 }
 866
 867 static void srp_completion(struct ib_cq *cq, void *target_ptr)
 868 {
 869         struct srp_target_port *target = target_ptr;
 870         struct ib_wc wc;
 871
 872         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 873         while (ib_poll_cq(cq, 1, &wc) > 0) {
 874                 if (wc.status) {
 875                         printk(KERN_ERR PFX "failed %s status %d\n",
 876                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
 877                                wc.status);
 878                         target->qp_in_error = 1;
 879                         break;
 880                 }
 881
 882                 if (wc.wr_id & SRP_OP_RECV)
 883                         srp_handle_recv(target, &wc);
 884                 else
 885                         ++target->tx_tail;
 886         }
 887 }
 888
 889 static int __srp_post_recv(struct srp_target_port *target)
 890 {
 891         struct srp_iu *iu;
 892         struct ib_sge list;
 893         struct ib_recv_wr wr, *bad_wr;
 894         unsigned int next;
 895         int ret;
 896
 897         next     = target->rx_head & (SRP_RQ_SIZE - 1);
 898         wr.wr_id = next | SRP_OP_RECV;
 899         iu       = target->rx_ring[next];
 900
 901         list.addr   = iu->dma;
 902         list.length = iu->size;
 903         list.lkey   = target->srp_host->dev->mr->lkey;
 904
 905         wr.next     = NULL;
 906         wr.sg_list  = &list;
 907         wr.num_sge  = 1;
 908
 909         ret = ib_post_recv(target->qp, &wr, &bad_wr);
 910         if (!ret)
 911                 ++target->rx_head;
 912
 913         return ret;
 914 }
 915
 916 static int srp_post_recv(struct srp_target_port *target)
 917 {
 918         unsigned long flags;
 919         int ret;
 920
 921         spin_lock_irqsave(target->scsi_host->host_lock, flags);
 922         ret = __srp_post_recv(target);
 923         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
 924
 925         return ret;
 926 }
 927
 928 /*
 929  * Must be called with target->scsi_host->host_lock held to protect
 930  * req_lim and tx_head.  Lock cannot be dropped between call here and
 931  * call to __srp_post_send().
 932  */
 933 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
 934 {
 935         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
 936                 return NULL;
 937
 938         if (unlikely(target->req_lim < 1))
 939                 ++target->zero_req_lim;
 940
 941         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
 942 }
 943
 944 /*
 945  * Must be called with target->scsi_host->host_lock held to protect
 946  * req_lim and tx_head.
 947  */
 948 static int __srp_post_send(struct srp_target_port *target,
 949                            struct srp_iu *iu, int len)
 950 {
 951         struct ib_sge list;
 952         struct ib_send_wr wr, *bad_wr;
 953         int ret = 0;
 954
 955         list.addr   = iu->dma;
 956         list.length = len;
 957         list.lkey   = target->srp_host->dev->mr->lkey;
 958
 959         wr.next       = NULL;
 960         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
 961         wr.sg_list    = &list;
 962         wr.num_sge    = 1;
 963         wr.opcode     = IB_WR_SEND;
 964         wr.send_flags = IB_SEND_SIGNALED;
 965
 966         ret = ib_post_send(target->qp, &wr, &bad_wr);
 967
 968         if (!ret) {
 969                 ++target->tx_head;
 970                 --target->req_lim;
 971         }
 972
 973         return ret;
 974 }
 975
 976 static int srp_queuecommand(struct scsi_cmnd *scmnd,
 977                             void (*done)(struct scsi_cmnd *))
 978 {
 979         struct srp_target_port *target = host_to_target(scmnd->device->host);
 980         struct srp_request *req;
 981         struct srp_iu *iu;
 982         struct srp_cmd *cmd;
 983         struct ib_device *dev;
 984         int len;
 985
 986         if (target->state == SRP_TARGET_CONNECTING)
 987                 goto err;
 988
 989         if (target->state == SRP_TARGET_DEAD ||
 990             target->state == SRP_TARGET_REMOVED) {
 991                 scmnd->result = DID_BAD_TARGET << 16;
 992                 done(scmnd);
 993                 return 0;
 994         }
 995
 996         iu = __srp_get_tx_iu(target);
 997         if (!iu)
 998                 goto err;
 999
1000         dev = target->srp_host->dev->dev;
1001         ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1002                                    DMA_TO_DEVICE);
1003
1004         req = list_entry(target->free_reqs.next, struct srp_request, list);
1005
1006         scmnd->scsi_done     = done;
1007         scmnd->result        = 0;
1008         scmnd->host_scribble = (void *) (long) req->index;
1009
1010         cmd = iu->buf;
1011         memset(cmd, 0, sizeof *cmd);
1012
1013         cmd->opcode = SRP_CMD;
1014         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1015         cmd->tag    = req->index;
1016         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1017
1018         req->scmnd    = scmnd;
1019         req->cmd      = iu;
1020         req->cmd_done = 0;
1021         req->tsk_mgmt = NULL;
1022
1023         len = srp_map_data(scmnd, target, req);
1024         if (len < 0) {
1025                 printk(KERN_ERR PFX "Failed to map data\n");
1026                 goto err;
1027         }
1028
1029         if (__srp_post_recv(target)) {
1030                 printk(KERN_ERR PFX "Recv failed\n");
1031                 goto err_unmap;
1032         }
1033
1034         ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1035                                       DMA_TO_DEVICE);
1036
1037         if (__srp_post_send(target, iu, len)) {
1038                 printk(KERN_ERR PFX "Send failed\n");
1039                 goto err_unmap;
1040         }
1041
1042         list_move_tail(&req->list, &target->req_queue);
1043
1044         return 0;
1045
1046 err_unmap:
1047         srp_unmap_data(scmnd, target, req);
1048
1049 err:
1050         return SCSI_MLQUEUE_HOST_BUSY;
1051 }
1052
1053 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1054 {
1055         int i;
1056
1057         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1058                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1059                                                   target->max_ti_iu_len,
1060                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1061                 if (!target->rx_ring[i])
1062                         goto err;
1063         }
1064
1065         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1066                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1067                                                   srp_max_iu_len,
1068                                                   GFP_KERNEL, DMA_TO_DEVICE);
1069                 if (!target->tx_ring[i])
1070                         goto err;
1071         }
1072
1073         return 0;
1074
1075 err:
1076         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1077                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1078                 target->rx_ring[i] = NULL;
1079         }
1080
1081         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1082                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1083                 target->tx_ring[i] = NULL;
1084         }
1085
1086         return -ENOMEM;
1087 }
1088
1089 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1090                                struct ib_cm_event *event,
1091                                struct srp_target_port *target)
1092 {
1093         struct ib_class_port_info *cpi;
1094         int opcode;
1095
1096         switch (event->param.rej_rcvd.reason) {
1097         case IB_CM_REJ_PORT_CM_REDIRECT:
1098                 cpi = event->param.rej_rcvd.ari;
1099                 target->path.dlid = cpi->redirect_lid;
1100                 target->path.pkey = cpi->redirect_pkey;
1101                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1102                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1103
1104                 target->status = target->path.dlid ?
1105                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1106                 break;
1107
1108         case IB_CM_REJ_PORT_REDIRECT:
1109                 if (srp_target_is_topspin(target)) {
1110                         /*
1111                          * Topspin/Cisco SRP gateways incorrectly send
1112                          * reject reason code 25 when they mean 24
1113                          * (port redirect).
1114                          */
1115                         memcpy(target->path.dgid.raw,
1116                                event->param.rej_rcvd.ari, 16);
1117
1118                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1119                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1120                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1121
1122                         target->status = SRP_PORT_REDIRECT;
1123                 } else {
1124                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1125                         target->status = -ECONNRESET;
1126                 }
1127                 break;
1128
1129         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1130                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1131                 target->status = -ECONNRESET;
1132                 break;
1133
1134         case IB_CM_REJ_CONSUMER_DEFINED:
1135                 opcode = *(u8 *) event->private_data;
1136                 if (opcode == SRP_LOGIN_REJ) {
1137                         struct srp_login_rej *rej = event->private_data;
1138                         u32 reason = be32_to_cpu(rej->reason);
1139
1140                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1141                                 printk(KERN_WARNING PFX
1142                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1143                         else
1144                                 printk(KERN_WARNING PFX
1145                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1146                 } else
1147                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1148                                " opcode 0x%02x\n", opcode);
1149                 target->status = -ECONNRESET;
1150                 break;
1151
1152         default:
1153                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1154                        event->param.rej_rcvd.reason);
1155                 target->status = -ECONNRESET;
1156         }
1157 }
1158
1159 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1160 {
1161         struct srp_target_port *target = cm_id->context;
1162         struct ib_qp_attr *qp_attr = NULL;
1163         int attr_mask = 0;
1164         int comp = 0;
1165         int opcode = 0;
1166
1167         switch (event->event) {
1168         case IB_CM_REQ_ERROR:
1169                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1170                 comp = 1;
1171                 target->status = -ECONNRESET;
1172                 break;
1173
1174         case IB_CM_REP_RECEIVED:
1175                 comp = 1;
1176                 opcode = *(u8 *) event->private_data;
1177
1178                 if (opcode == SRP_LOGIN_RSP) {
1179                         struct srp_login_rsp *rsp = event->private_data;
1180
1181                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1182                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1183
1184                         target->scsi_host->can_queue = min(target->req_lim,
1185                                                            target->scsi_host->can_queue);
1186                 } else {
1187                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1188                         target->status = -ECONNRESET;
1189                         break;
1190                 }
1191
1192                 if (!target->rx_ring[0]) {
1193                         target->status = srp_alloc_iu_bufs(target);
1194                         if (target->status)
1195                                 break;
1196                 }
1197
1198                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1199                 if (!qp_attr) {
1200                         target->status = -ENOMEM;
1201                         break;
1202                 }
1203
1204                 qp_attr->qp_state = IB_QPS_RTR;
1205                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1206                 if (target->status)
1207                         break;
1208
1209                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1210                 if (target->status)
1211                         break;
1212
1213                 target->status = srp_post_recv(target);
1214                 if (target->status)
1215                         break;
1216
1217                 qp_attr->qp_state = IB_QPS_RTS;
1218                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1219                 if (target->status)
1220                         break;
1221
1222                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1223                 if (target->status)
1224                         break;
1225
1226                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1227                 if (target->status)
1228                         break;
1229
1230                 break;
1231
1232         case IB_CM_REJ_RECEIVED:
1233                 printk(KERN_DEBUG PFX "REJ received\n");
1234                 comp = 1;
1235
1236                 srp_cm_rej_handler(cm_id, event, target);
1237                 break;
1238
1239         case IB_CM_DREQ_RECEIVED:
1240                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1241                 if (ib_send_cm_drep(cm_id, NULL, 0))
1242                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1243                 break;
1244
1245         case IB_CM_TIMEWAIT_EXIT:
1246                 printk(KERN_ERR PFX "connection closed\n");
1247
1248                 comp = 1;
1249                 target->status = 0;
1250                 break;
1251
1252         case IB_CM_MRA_RECEIVED:
1253         case IB_CM_DREQ_ERROR:
1254         case IB_CM_DREP_RECEIVED:
1255                 break;
1256
1257         default:
1258                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1259                 break;
1260         }
1261
1262         if (comp)
1263                 complete(&target->done);
1264
1265         kfree(qp_attr);
1266
1267         return 0;
1268 }
1269
1270 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1271                              struct srp_request *req, u8 func)
1272 {
1273         struct srp_iu *iu;
1274         struct srp_tsk_mgmt *tsk_mgmt;
1275
1276         spin_lock_irq(target->scsi_host->host_lock);
1277
1278         if (target->state == SRP_TARGET_DEAD ||
1279             target->state == SRP_TARGET_REMOVED) {
1280                 req->scmnd->result = DID_BAD_TARGET << 16;
1281                 goto out;
1282         }
1283
1284         init_completion(&req->done);
1285
1286         iu = __srp_get_tx_iu(target);
1287         if (!iu)
1288                 goto out;
1289
1290         tsk_mgmt = iu->buf;
1291         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1292
1293         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1294         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1295         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1296         tsk_mgmt->tsk_mgmt_func = func;
1297         tsk_mgmt->task_tag      = req->index;
1298
1299         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1300                 goto out;
1301
1302         req->tsk_mgmt = iu;
1303
1304         spin_unlock_irq(target->scsi_host->host_lock);
1305
1306         if (!wait_for_completion_timeout(&req->done,
1307                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1308                 return -1;
1309
1310         return 0;
1311
1312 out:
1313         spin_unlock_irq(target->scsi_host->host_lock);
1314         return -1;
1315 }
1316
1317 static int srp_find_req(struct srp_target_port *target,
1318                         struct scsi_cmnd *scmnd,
1319                         struct srp_request **req)
1320 {
1321         if (scmnd->host_scribble == (void *) -1L)
1322                 return -1;
1323
1324         *req = &target->req_ring[(long) scmnd->host_scribble];
1325
1326         return 0;
1327 }
1328
1329 static int srp_abort(struct scsi_cmnd *scmnd)
1330 {
1331         struct srp_target_port *target = host_to_target(scmnd->device->host);
1332         struct srp_request *req;
1333         int ret = SUCCESS;
1334
1335         printk(KERN_ERR "SRP abort called\n");
1336
1337         if (target->qp_in_error)
1338                 return FAILED;
1339         if (srp_find_req(target, scmnd, &req))
1340                 return FAILED;
1341         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1342                 return FAILED;
1343
1344         spin_lock_irq(target->scsi_host->host_lock);
1345
1346         if (req->cmd_done) {
1347                 srp_remove_req(target, req);
1348                 scmnd->scsi_done(scmnd);
1349         } else if (!req->tsk_status) {
1350                 srp_remove_req(target, req);
1351                 scmnd->result = DID_ABORT << 16;
1352         } else
1353                 ret = FAILED;
1354
1355         spin_unlock_irq(target->scsi_host->host_lock);
1356
1357         return ret;
1358 }
1359
1360 static int srp_reset_device(struct scsi_cmnd *scmnd)
1361 {
1362         struct srp_target_port *target = host_to_target(scmnd->device->host);
1363         struct srp_request *req, *tmp;
1364
1365         printk(KERN_ERR "SRP reset_device called\n");
1366
1367         if (target->qp_in_error)
1368                 return FAILED;
1369         if (srp_find_req(target, scmnd, &req))
1370                 return FAILED;
1371         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1372                 return FAILED;
1373         if (req->tsk_status)
1374                 return FAILED;
1375
1376         spin_lock_irq(target->scsi_host->host_lock);
1377
1378         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1379                 if (req->scmnd->device == scmnd->device)
1380                         srp_reset_req(target, req);
1381
1382         spin_unlock_irq(target->scsi_host->host_lock);
1383
1384         return SUCCESS;
1385 }
1386
1387 static int srp_reset_host(struct scsi_cmnd *scmnd)
1388 {
1389         struct srp_target_port *target = host_to_target(scmnd->device->host);
1390         int ret = FAILED;
1391
1392         printk(KERN_ERR PFX "SRP reset_host called\n");
1393
1394         if (!srp_reconnect_target(target))
1395                 ret = SUCCESS;
1396
1397         return ret;
1398 }
1399
1400 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1401 {
1402         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1403
1404         if (target->state == SRP_TARGET_DEAD ||
1405             target->state == SRP_TARGET_REMOVED)
1406                 return -ENODEV;
1407
1408         return sprintf(buf, "0x%016llx\n",
1409                        (unsigned long long) be64_to_cpu(target->id_ext));
1410 }
1411
1412 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1413 {
1414         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1415
1416         if (target->state == SRP_TARGET_DEAD ||
1417             target->state == SRP_TARGET_REMOVED)
1418                 return -ENODEV;
1419
1420         return sprintf(buf, "0x%016llx\n",
1421                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1422 }
1423
1424 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1425 {
1426         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1427
1428         if (target->state == SRP_TARGET_DEAD ||
1429             target->state == SRP_TARGET_REMOVED)
1430                 return -ENODEV;
1431
1432         return sprintf(buf, "0x%016llx\n",
1433                        (unsigned long long) be64_to_cpu(target->service_id));
1434 }
1435
1436 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1437 {
1438         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1439
1440         if (target->state == SRP_TARGET_DEAD ||
1441             target->state == SRP_TARGET_REMOVED)
1442                 return -ENODEV;
1443
1444         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1445 }
1446
1447 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1448 {
1449         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1450
1451         if (target->state == SRP_TARGET_DEAD ||
1452             target->state == SRP_TARGET_REMOVED)
1453                 return -ENODEV;
1454
1455         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1456                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1457                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1458                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1459                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1460                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1461                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1462                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1463                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1464 }
1465
1466 static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
1467 {
1468         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1469
1470         if (target->state == SRP_TARGET_DEAD ||
1471             target->state == SRP_TARGET_REMOVED)
1472                 return -ENODEV;
1473
1474         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1475                        be16_to_cpu(target->orig_dgid[0]),
1476                        be16_to_cpu(target->orig_dgid[1]),
1477                        be16_to_cpu(target->orig_dgid[2]),
1478                        be16_to_cpu(target->orig_dgid[3]),
1479                        be16_to_cpu(target->orig_dgid[4]),
1480                        be16_to_cpu(target->orig_dgid[5]),
1481                        be16_to_cpu(target->orig_dgid[6]),
1482                        be16_to_cpu(target->orig_dgid[7]));
1483 }
1484
1485 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1486 {
1487         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1488
1489         if (target->state == SRP_TARGET_DEAD ||
1490             target->state == SRP_TARGET_REMOVED)
1491                 return -ENODEV;
1492
1493         return sprintf(buf, "%d\n", target->zero_req_lim);
1494 }
1495
1496 static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
1497 {
1498         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1499
1500         return sprintf(buf, "%d\n", target->srp_host->port);
1501 }
1502
1503 static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
1504 {
1505         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1506
1507         return sprintf(buf, "%s\n", target->srp_host->dev->dev->name);
1508 }
1509
1510 static CLASS_DEVICE_ATTR(id_ext,          S_IRUGO, show_id_ext,          NULL);
1511 static CLASS_DEVICE_ATTR(ioc_guid,        S_IRUGO, show_ioc_guid,        NULL);
1512 static CLASS_DEVICE_ATTR(service_id,      S_IRUGO, show_service_id,      NULL);
1513 static CLASS_DEVICE_ATTR(pkey,            S_IRUGO, show_pkey,            NULL);
1514 static CLASS_DEVICE_ATTR(dgid,            S_IRUGO, show_dgid,            NULL);
1515 static CLASS_DEVICE_ATTR(orig_dgid,       S_IRUGO, show_orig_dgid,       NULL);
1516 static CLASS_DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,    NULL);
1517 static CLASS_DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
1518 static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1519
1520 static struct class_device_attribute *srp_host_attrs[] = {
1521         &class_device_attr_id_ext,
1522         &class_device_attr_ioc_guid,
1523         &class_device_attr_service_id,
1524         &class_device_attr_pkey,
1525         &class_device_attr_dgid,
1526         &class_device_attr_orig_dgid,
1527         &class_device_attr_zero_req_lim,
1528         &class_device_attr_local_ib_port,
1529         &class_device_attr_local_ib_device,
1530         NULL
1531 };
1532
1533 static struct scsi_host_template srp_template = {
1534         .module                         = THIS_MODULE,
1535         .name                           = "InfiniBand SRP initiator",
1536         .proc_name                      = DRV_NAME,
1537         .info                           = srp_target_info,
1538         .queuecommand                   = srp_queuecommand,
1539         .eh_abort_handler               = srp_abort,
1540         .eh_device_reset_handler        = srp_reset_device,
1541         .eh_host_reset_handler          = srp_reset_host,
1542         .can_queue                      = SRP_SQ_SIZE,
1543         .this_id                        = -1,
1544         .cmd_per_lun                    = SRP_SQ_SIZE,
1545         .use_clustering                 = ENABLE_CLUSTERING,
1546         .shost_attrs                    = srp_host_attrs
1547 };
1548
1549 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1550 {
1551         struct srp_rport_identifiers ids;
1552         struct srp_rport *rport;
1553
1554         sprintf(target->target_name, "SRP.T10:%016llX",
1555                  (unsigned long long) be64_to_cpu(target->id_ext));
1556
1557         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1558                 return -ENODEV;
1559
1560         memcpy(ids.port_id, &target->id_ext, 8);
1561         memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1562         ids.roles = SRP_RPORT_ROLE_TARGET;
1563         rport = srp_rport_add(target->scsi_host, &ids);
1564         if (IS_ERR(rport)) {
1565                 scsi_remove_host(target->scsi_host);
1566                 return PTR_ERR(rport);
1567         }
1568
1569         spin_lock(&host->target_lock);
1570         list_add_tail(&target->list, &host->target_list);
1571         spin_unlock(&host->target_lock);
1572
1573         target->state = SRP_TARGET_LIVE;
1574
1575         scsi_scan_target(&target->scsi_host->shost_gendev,
1576                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1577
1578         return 0;
1579 }
1580
1581 static void srp_release_class_dev(struct class_device *class_dev)
1582 {
1583         struct srp_host *host =
1584                 container_of(class_dev, struct srp_host, class_dev);
1585
1586         complete(&host->released);
1587 }
1588
1589 static struct class srp_class = {
1590         .name    = "infiniband_srp",
1591         .release = srp_release_class_dev
1592 };
1593
1594 /*
1595  * Target ports are added by writing
1596  *
1597  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1598  *     pkey=<P_Key>,service_id=<service ID>
1599  *
1600  * to the add_target sysfs attribute.
1601  */
1602 enum {
1603         SRP_OPT_ERR             = 0,
1604         SRP_OPT_ID_EXT          = 1 << 0,
1605         SRP_OPT_IOC_GUID        = 1 << 1,
1606         SRP_OPT_DGID            = 1 << 2,
1607         SRP_OPT_PKEY            = 1 << 3,
1608         SRP_OPT_SERVICE_ID      = 1 << 4,
1609         SRP_OPT_MAX_SECT        = 1 << 5,
1610         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1611         SRP_OPT_IO_CLASS        = 1 << 7,
1612         SRP_OPT_INITIATOR_EXT   = 1 << 8,
1613         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1614                                    SRP_OPT_IOC_GUID     |
1615                                    SRP_OPT_DGID         |
1616                                    SRP_OPT_PKEY         |
1617                                    SRP_OPT_SERVICE_ID),
1618 };
1619
1620 static match_table_t srp_opt_tokens = {
1621         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1622         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1623         { SRP_OPT_DGID,                 "dgid=%s"               },
1624         { SRP_OPT_PKEY,                 "pkey=%x"               },
1625         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1626         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1627         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1628         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1629         { SRP_OPT_INITIATOR_EXT,        "initiator_ext=%s"      },
1630         { SRP_OPT_ERR,                  NULL                    }
1631 };
1632
1633 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1634 {
1635         char *options, *sep_opt;
1636         char *p;
1637         char dgid[3];
1638         substring_t args[MAX_OPT_ARGS];
1639         int opt_mask = 0;
1640         int token;
1641         int ret = -EINVAL;
1642         int i;
1643
1644         options = kstrdup(buf, GFP_KERNEL);
1645         if (!options)
1646                 return -ENOMEM;
1647
1648         sep_opt = options;
1649         while ((p = strsep(&sep_opt, ",")) != NULL) {
1650                 if (!*p)
1651                         continue;
1652
1653                 token = match_token(p, srp_opt_tokens, args);
1654                 opt_mask |= token;
1655
1656                 switch (token) {
1657                 case SRP_OPT_ID_EXT:
1658                         p = match_strdup(args);
1659                         if (!p) {
1660                                 ret = -ENOMEM;
1661                                 goto out;
1662                         }
1663                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1664                         kfree(p);
1665                         break;
1666
1667                 case SRP_OPT_IOC_GUID:
1668                         p = match_strdup(args);
1669                         if (!p) {
1670                                 ret = -ENOMEM;
1671                                 goto out;
1672                         }
1673                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1674                         kfree(p);
1675                         break;
1676
1677                 case SRP_OPT_DGID:
1678                         p = match_strdup(args);
1679                         if (!p) {
1680                                 ret = -ENOMEM;
1681                                 goto out;
1682                         }
1683                         if (strlen(p) != 32) {
1684                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1685                                 kfree(p);
1686                                 goto out;
1687                         }
1688
1689                         for (i = 0; i < 16; ++i) {
1690                                 strlcpy(dgid, p + i * 2, 3);
1691                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1692                         }
1693                         kfree(p);
1694                         memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1695                         break;
1696
1697                 case SRP_OPT_PKEY:
1698                         if (match_hex(args, &token)) {
1699                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1700                                 goto out;
1701                         }
1702                         target->path.pkey = cpu_to_be16(token);
1703                         break;
1704
1705                 case SRP_OPT_SERVICE_ID:
1706                         p = match_strdup(args);
1707                         if (!p) {
1708                                 ret = -ENOMEM;
1709                                 goto out;
1710                         }
1711                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1712                         target->path.service_id = target->service_id;
1713                         kfree(p);
1714                         break;
1715
1716                 case SRP_OPT_MAX_SECT:
1717                         if (match_int(args, &token)) {
1718                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1719                                 goto out;
1720                         }
1721                         target->scsi_host->max_sectors = token;
1722                         break;
1723
1724                 case SRP_OPT_MAX_CMD_PER_LUN:
1725                         if (match_int(args, &token)) {
1726                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1727                                 goto out;
1728                         }
1729                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1730                         break;
1731
1732                 case SRP_OPT_IO_CLASS:
1733                         if (match_hex(args, &token)) {
1734                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1735                                 goto out;
1736                         }
1737                         if (token != SRP_REV10_IB_IO_CLASS &&
1738                             token != SRP_REV16A_IB_IO_CLASS) {
1739                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1740                                        " %x specified (use %x or %x).\n",
1741                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1742                                 goto out;
1743                         }
1744                         target->io_class = token;
1745                         break;
1746
1747                 case SRP_OPT_INITIATOR_EXT:
1748                         p = match_strdup(args);
1749                         if (!p) {
1750                                 ret = -ENOMEM;
1751                                 goto out;
1752                         }
1753                         target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1754                         kfree(p);
1755                         break;
1756
1757                 default:
1758                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1759                                "'%s' in target creation request\n", p);
1760                         goto out;
1761                 }
1762         }
1763
1764         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1765                 ret = 0;
1766         else
1767                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1768                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1769                             !(srp_opt_tokens[i].token & opt_mask))
1770                                 printk(KERN_WARNING PFX "target creation request is "
1771                                        "missing parameter '%s'\n",
1772                                        srp_opt_tokens[i].pattern);
1773
1774 out:
1775         kfree(options);
1776         return ret;
1777 }
1778
1779 static ssize_t srp_create_target(struct class_device *class_dev,
1780                                  const char *buf, size_t count)
1781 {
1782         struct srp_host *host =
1783                 container_of(class_dev, struct srp_host, class_dev);
1784         struct Scsi_Host *target_host;
1785         struct srp_target_port *target;
1786         int ret;
1787         int i;
1788
1789         target_host = scsi_host_alloc(&srp_template,
1790                                       sizeof (struct srp_target_port));
1791         if (!target_host)
1792                 return -ENOMEM;
1793
1794         target_host->transportt = ib_srp_transport_template;
1795         target_host->max_lun     = SRP_MAX_LUN;
1796         target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1797
1798         target = host_to_target(target_host);
1799
1800         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1801         target->scsi_host  = target_host;
1802         target->srp_host   = host;
1803
1804         INIT_LIST_HEAD(&target->free_reqs);
1805         INIT_LIST_HEAD(&target->req_queue);
1806         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1807                 target->req_ring[i].index = i;
1808                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1809         }
1810
1811         ret = srp_parse_options(buf, target);
1812         if (ret)
1813                 goto err;
1814
1815         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1816
1817         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1818                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1819                (unsigned long long) be64_to_cpu(target->id_ext),
1820                (unsigned long long) be64_to_cpu(target->ioc_guid),
1821                be16_to_cpu(target->path.pkey),
1822                (unsigned long long) be64_to_cpu(target->service_id),
1823                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1824                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1825                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1826                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1827                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1828                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1829                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1830                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1831
1832         ret = srp_create_target_ib(target);
1833         if (ret)
1834                 goto err;
1835
1836         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1837         if (IS_ERR(target->cm_id)) {
1838                 ret = PTR_ERR(target->cm_id);
1839                 goto err_free;
1840         }
1841
1842         target->qp_in_error = 0;
1843         ret = srp_connect_target(target);
1844         if (ret) {
1845                 printk(KERN_ERR PFX "Connection failed\n");
1846                 goto err_cm_id;
1847         }
1848
1849         ret = srp_add_target(host, target);
1850         if (ret)
1851                 goto err_disconnect;
1852
1853         return count;
1854
1855 err_disconnect:
1856         srp_disconnect_target(target);
1857
1858 err_cm_id:
1859         ib_destroy_cm_id(target->cm_id);
1860
1861 err_free:
1862         srp_free_target_ib(target);
1863
1864 err:
1865         scsi_host_put(target_host);
1866
1867         return ret;
1868 }
1869
1870 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1871
1872 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1873 {
1874         struct srp_host *host =
1875                 container_of(class_dev, struct srp_host, class_dev);
1876
1877         return sprintf(buf, "%s\n", host->dev->dev->name);
1878 }
1879
1880 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1881
1882 static ssize_t show_port(struct class_device *class_dev, char *buf)
1883 {
1884         struct srp_host *host =
1885                 container_of(class_dev, struct srp_host, class_dev);
1886
1887         return sprintf(buf, "%d\n", host->port);
1888 }
1889
1890 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1891
1892 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1893 {
1894         struct srp_host *host;
1895
1896         host = kzalloc(sizeof *host, GFP_KERNEL);
1897         if (!host)
1898                 return NULL;
1899
1900         INIT_LIST_HEAD(&host->target_list);
1901         spin_lock_init(&host->target_lock);
1902         init_completion(&host->released);
1903         host->dev  = device;
1904         host->port = port;
1905
1906         host->class_dev.class = &srp_class;
1907         host->class_dev.dev   = device->dev->dma_device;
1908         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1909                  device->dev->name, port);
1910
1911         if (class_device_register(&host->class_dev))
1912                 goto free_host;
1913         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1914                 goto err_class;
1915         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1916                 goto err_class;
1917         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1918                 goto err_class;
1919
1920         return host;
1921
1922 err_class:
1923         class_device_unregister(&host->class_dev);
1924
1925 free_host:
1926         kfree(host);
1927
1928         return NULL;
1929 }
1930
1931 static void srp_add_one(struct ib_device *device)
1932 {
1933         struct srp_device *srp_dev;
1934         struct ib_device_attr *dev_attr;
1935         struct ib_fmr_pool_param fmr_param;
1936         struct srp_host *host;
1937         int s, e, p;
1938
1939         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1940         if (!dev_attr)
1941                 return;
1942
1943         if (ib_query_device(device, dev_attr)) {
1944                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1945                        device->name);
1946                 goto free_attr;
1947         }
1948
1949         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1950         if (!srp_dev)
1951                 goto free_attr;
1952
1953         /*
1954          * Use the smallest page size supported by the HCA, down to a
1955          * minimum of 512 bytes (which is the smallest sector that a
1956          * SCSI command will ever carry).
1957          */
1958         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1959         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1960         srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
1961
1962         INIT_LIST_HEAD(&srp_dev->dev_list);
1963
1964         srp_dev->dev = device;
1965         srp_dev->pd  = ib_alloc_pd(device);
1966         if (IS_ERR(srp_dev->pd))
1967                 goto free_dev;
1968
1969         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1970                                     IB_ACCESS_LOCAL_WRITE |
1971                                     IB_ACCESS_REMOTE_READ |
1972                                     IB_ACCESS_REMOTE_WRITE);
1973         if (IS_ERR(srp_dev->mr))
1974                 goto err_pd;
1975
1976         memset(&fmr_param, 0, sizeof fmr_param);
1977         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1978         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1979         fmr_param.cache             = 1;
1980         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1981         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1982         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1983                                        IB_ACCESS_REMOTE_WRITE |
1984                                        IB_ACCESS_REMOTE_READ);
1985
1986         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1987         if (IS_ERR(srp_dev->fmr_pool))
1988                 srp_dev->fmr_pool = NULL;
1989
1990         if (device->node_type == RDMA_NODE_IB_SWITCH) {
1991                 s = 0;
1992                 e = 0;
1993         } else {
1994                 s = 1;
1995                 e = device->phys_port_cnt;
1996         }
1997
1998         for (p = s; p <= e; ++p) {
1999                 host = srp_add_port(srp_dev, p);
2000                 if (host)
2001                         list_add_tail(&host->list, &srp_dev->dev_list);
2002         }
2003
2004         ib_set_client_data(device, &srp_client, srp_dev);
2005
2006         goto free_attr;
2007
2008 err_pd:
2009         ib_dealloc_pd(srp_dev->pd);
2010
2011 free_dev:
2012         kfree(srp_dev);
2013
2014 free_attr:
2015         kfree(dev_attr);
2016 }
2017
2018 static void srp_remove_one(struct ib_device *device)
2019 {
2020         struct srp_device *srp_dev;
2021         struct srp_host *host, *tmp_host;
2022         LIST_HEAD(target_list);
2023         struct srp_target_port *target, *tmp_target;
2024
2025         srp_dev = ib_get_client_data(device, &srp_client);
2026
2027         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2028                 class_device_unregister(&host->class_dev);
2029                 /*
2030                  * Wait for the sysfs entry to go away, so that no new
2031                  * target ports can be created.
2032                  */
2033                 wait_for_completion(&host->released);
2034
2035                 /*
2036                  * Mark all target ports as removed, so we stop queueing
2037                  * commands and don't try to reconnect.
2038                  */
2039                 spin_lock(&host->target_lock);
2040                 list_for_each_entry(target, &host->target_list, list) {
2041                         spin_lock_irq(target->scsi_host->host_lock);
2042                         target->state = SRP_TARGET_REMOVED;
2043                         spin_unlock_irq(target->scsi_host->host_lock);
2044                 }
2045                 spin_unlock(&host->target_lock);
2046
2047                 /*
2048                  * Wait for any reconnection tasks that may have
2049                  * started before we marked our target ports as
2050                  * removed, and any target port removal tasks.
2051                  */
2052                 flush_scheduled_work();
2053
2054                 list_for_each_entry_safe(target, tmp_target,
2055                                          &host->target_list, list) {
2056                         scsi_remove_host(target->scsi_host);
2057                         srp_disconnect_target(target);
2058                         ib_destroy_cm_id(target->cm_id);
2059                         srp_free_target_ib(target);
2060                         scsi_host_put(target->scsi_host);
2061                 }
2062
2063                 kfree(host);
2064         }
2065
2066         if (srp_dev->fmr_pool)
2067                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2068         ib_dereg_mr(srp_dev->mr);
2069         ib_dealloc_pd(srp_dev->pd);
2070
2071         kfree(srp_dev);
2072 }
2073
2074 static struct srp_function_template ib_srp_transport_functions = {
2075 };
2076
2077 static int __init srp_init_module(void)
2078 {
2079         int ret;
2080
2081         ib_srp_transport_template =
2082                 srp_attach_transport(&ib_srp_transport_functions);
2083         if (!ib_srp_transport_template)
2084                 return -ENOMEM;
2085
2086         srp_template.sg_tablesize = srp_sg_tablesize;
2087         srp_max_iu_len = (sizeof (struct srp_cmd) +
2088                           sizeof (struct srp_indirect_buf) +
2089                           srp_sg_tablesize * 16);
2090
2091         ret = class_register(&srp_class);
2092         if (ret) {
2093                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2094                 srp_release_transport(ib_srp_transport_template);
2095                 return ret;
2096         }
2097
2098         ib_sa_register_client(&srp_sa_client);
2099
2100         ret = ib_register_client(&srp_client);
2101         if (ret) {
2102                 printk(KERN_ERR PFX "couldn't register IB client\n");
2103                 srp_release_transport(ib_srp_transport_template);
2104                 ib_sa_unregister_client(&srp_sa_client);
2105                 class_unregister(&srp_class);
2106                 return ret;
2107         }
2108
2109         return 0;
2110 }
2111
2112 static void __exit srp_cleanup_module(void)
2113 {
2114         ib_unregister_client(&srp_client);
2115         ib_sa_unregister_client(&srp_sa_client);
2116         class_unregister(&srp_class);
2117         srp_release_transport(ib_srp_transport_template);
2118 }
2119
2120 module_init(srp_init_module);
2121 module_exit(srp_cleanup_module);