kernel/drivers/infiniband/core/verbs.c

   1 /*
   2  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   3  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   4  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   5  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   6  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
   7  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   8  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   9  *
  10  * This software is available to you under a choice of one of two
  11  * licenses.  You may choose to be licensed under the terms of the GNU
  12  * General Public License (GPL) Version 2, available from the file
  13  * COPYING in the main directory of this source tree, or the
  14  * OpenIB.org BSD license below:
  15  *
  16  *     Redistribution and use in source and binary forms, with or
  17  *     without modification, are permitted provided that the following
  18  *     conditions are met:
  19  *
  20  *      - Redistributions of source code must retain the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer.
  23  *
  24  *      - Redistributions in binary form must reproduce the above
  25  *        copyright notice, this list of conditions and the following
  26  *        disclaimer in the documentation and/or other materials
  27  *        provided with the distribution.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  33  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  34  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  35  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  36  * SOFTWARE.
  37  */
  38
  39 #include <linux/errno.h>
  40 #include <linux/err.h>
  41 #include <linux/export.h>
  42 #include <linux/string.h>
  43 #include <linux/slab.h>
  44 #include <linux/in.h>
  45 #include <linux/in6.h>
  46 #include <net/addrconf.h>
  47
  48 #include <rdma/ib_verbs.h>
  49 #include <rdma/ib_cache.h>
  50 #include <rdma/ib_addr.h>
  51
  52 #include "core_priv.h"
  53
  54 static const char * const ib_events[] = {
  55         [IB_EVENT_CQ_ERR]               = "CQ error",
  56         [IB_EVENT_QP_FATAL]             = "QP fatal error",
  57         [IB_EVENT_QP_REQ_ERR]           = "QP request error",
  58         [IB_EVENT_QP_ACCESS_ERR]        = "QP access error",
  59         [IB_EVENT_COMM_EST]             = "communication established",
  60         [IB_EVENT_SQ_DRAINED]           = "send queue drained",
  61         [IB_EVENT_PATH_MIG]             = "path migration successful",
  62         [IB_EVENT_PATH_MIG_ERR]         = "path migration error",
  63         [IB_EVENT_DEVICE_FATAL]         = "device fatal error",
  64         [IB_EVENT_PORT_ACTIVE]          = "port active",
  65         [IB_EVENT_PORT_ERR]             = "port error",
  66         [IB_EVENT_LID_CHANGE]           = "LID change",
  67         [IB_EVENT_PKEY_CHANGE]          = "P_key change",
  68         [IB_EVENT_SM_CHANGE]            = "SM change",
  69         [IB_EVENT_SRQ_ERR]              = "SRQ error",
  70         [IB_EVENT_SRQ_LIMIT_REACHED]    = "SRQ limit reached",
  71         [IB_EVENT_QP_LAST_WQE_REACHED]  = "last WQE reached",
  72         [IB_EVENT_CLIENT_REREGISTER]    = "client reregister",
  73         [IB_EVENT_GID_CHANGE]           = "GID changed",
  74 };
  75
  76 const char *__attribute_const__ ib_event_msg(enum ib_event_type event)
  77 {
  78         size_t index = event;
  79
  80         return (index < ARRAY_SIZE(ib_events) && ib_events[index]) ?
  81                         ib_events[index] : "unrecognized event";
  82 }
  83 EXPORT_SYMBOL(ib_event_msg);
  84
  85 static const char * const wc_statuses[] = {
  86         [IB_WC_SUCCESS]                 = "success",
  87         [IB_WC_LOC_LEN_ERR]             = "local length error",
  88         [IB_WC_LOC_QP_OP_ERR]           = "local QP operation error",
  89         [IB_WC_LOC_EEC_OP_ERR]          = "local EE context operation error",
  90         [IB_WC_LOC_PROT_ERR]            = "local protection error",
  91         [IB_WC_WR_FLUSH_ERR]            = "WR flushed",
  92         [IB_WC_MW_BIND_ERR]             = "memory management operation error",
  93         [IB_WC_BAD_RESP_ERR]            = "bad response error",
  94         [IB_WC_LOC_ACCESS_ERR]          = "local access error",
  95         [IB_WC_REM_INV_REQ_ERR]         = "invalid request error",
  96         [IB_WC_REM_ACCESS_ERR]          = "remote access error",
  97         [IB_WC_REM_OP_ERR]              = "remote operation error",
  98         [IB_WC_RETRY_EXC_ERR]           = "transport retry counter exceeded",
  99         [IB_WC_RNR_RETRY_EXC_ERR]       = "RNR retry counter exceeded",
 100         [IB_WC_LOC_RDD_VIOL_ERR]        = "local RDD violation error",
 101         [IB_WC_REM_INV_RD_REQ_ERR]      = "remote invalid RD request",
 102         [IB_WC_REM_ABORT_ERR]           = "operation aborted",
 103         [IB_WC_INV_EECN_ERR]            = "invalid EE context number",
 104         [IB_WC_INV_EEC_STATE_ERR]       = "invalid EE context state",
 105         [IB_WC_FATAL_ERR]               = "fatal error",
 106         [IB_WC_RESP_TIMEOUT_ERR]        = "response timeout error",
 107         [IB_WC_GENERAL_ERR]             = "general error",
 108 };
 109
 110 const char *__attribute_const__ ib_wc_status_msg(enum ib_wc_status status)
 111 {
 112         size_t index = status;
 113
 114         return (index < ARRAY_SIZE(wc_statuses) && wc_statuses[index]) ?
 115                         wc_statuses[index] : "unrecognized status";
 116 }
 117 EXPORT_SYMBOL(ib_wc_status_msg);
 118
 119 __attribute_const__ int ib_rate_to_mult(enum ib_rate rate)
 120 {
 121         switch (rate) {
 122         case IB_RATE_2_5_GBPS: return  1;
 123         case IB_RATE_5_GBPS:   return  2;
 124         case IB_RATE_10_GBPS:  return  4;
 125         case IB_RATE_20_GBPS:  return  8;
 126         case IB_RATE_30_GBPS:  return 12;
 127         case IB_RATE_40_GBPS:  return 16;
 128         case IB_RATE_60_GBPS:  return 24;
 129         case IB_RATE_80_GBPS:  return 32;
 130         case IB_RATE_120_GBPS: return 48;
 131         default:               return -1;
 132         }
 133 }
 134 EXPORT_SYMBOL(ib_rate_to_mult);
 135
 136 __attribute_const__ enum ib_rate mult_to_ib_rate(int mult)
 137 {
 138         switch (mult) {
 139         case 1:  return IB_RATE_2_5_GBPS;
 140         case 2:  return IB_RATE_5_GBPS;
 141         case 4:  return IB_RATE_10_GBPS;
 142         case 8:  return IB_RATE_20_GBPS;
 143         case 12: return IB_RATE_30_GBPS;
 144         case 16: return IB_RATE_40_GBPS;
 145         case 24: return IB_RATE_60_GBPS;
 146         case 32: return IB_RATE_80_GBPS;
 147         case 48: return IB_RATE_120_GBPS;
 148         default: return IB_RATE_PORT_CURRENT;
 149         }
 150 }
 151 EXPORT_SYMBOL(mult_to_ib_rate);
 152
 153 __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate)
 154 {
 155         switch (rate) {
 156         case IB_RATE_2_5_GBPS: return 2500;
 157         case IB_RATE_5_GBPS:   return 5000;
 158         case IB_RATE_10_GBPS:  return 10000;
 159         case IB_RATE_20_GBPS:  return 20000;
 160         case IB_RATE_30_GBPS:  return 30000;
 161         case IB_RATE_40_GBPS:  return 40000;
 162         case IB_RATE_60_GBPS:  return 60000;
 163         case IB_RATE_80_GBPS:  return 80000;
 164         case IB_RATE_120_GBPS: return 120000;
 165         case IB_RATE_14_GBPS:  return 14062;
 166         case IB_RATE_56_GBPS:  return 56250;
 167         case IB_RATE_112_GBPS: return 112500;
 168         case IB_RATE_168_GBPS: return 168750;
 169         case IB_RATE_25_GBPS:  return 25781;
 170         case IB_RATE_100_GBPS: return 103125;
 171         case IB_RATE_200_GBPS: return 206250;
 172         case IB_RATE_300_GBPS: return 309375;
 173         default:               return -1;
 174         }
 175 }
 176 EXPORT_SYMBOL(ib_rate_to_mbps);
 177
 178 __attribute_const__ enum rdma_transport_type
 179 rdma_node_get_transport(enum rdma_node_type node_type)
 180 {
 181         switch (node_type) {
 182         case RDMA_NODE_IB_CA:
 183         case RDMA_NODE_IB_SWITCH:
 184         case RDMA_NODE_IB_ROUTER:
 185                 return RDMA_TRANSPORT_IB;
 186         case RDMA_NODE_RNIC:
 187                 return RDMA_TRANSPORT_IWARP;
 188         case RDMA_NODE_USNIC:
 189                 return RDMA_TRANSPORT_USNIC;
 190         case RDMA_NODE_USNIC_UDP:
 191                 return RDMA_TRANSPORT_USNIC_UDP;
 192         default:
 193                 BUG();
 194                 return 0;
 195         }
 196 }
 197 EXPORT_SYMBOL(rdma_node_get_transport);
 198
 199 enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device, u8 port_num)
 200 {
 201         if (device->get_link_layer)
 202                 return device->get_link_layer(device, port_num);
 203
 204         switch (rdma_node_get_transport(device->node_type)) {
 205         case RDMA_TRANSPORT_IB:
 206                 return IB_LINK_LAYER_INFINIBAND;
 207         case RDMA_TRANSPORT_IWARP:
 208         case RDMA_TRANSPORT_USNIC:
 209         case RDMA_TRANSPORT_USNIC_UDP:
 210                 return IB_LINK_LAYER_ETHERNET;
 211         default:
 212                 return IB_LINK_LAYER_UNSPECIFIED;
 213         }
 214 }
 215 EXPORT_SYMBOL(rdma_port_get_link_layer);
 216
 217 /* Protection domains */
 218
 219 /**
 220  * ib_alloc_pd - Allocates an unused protection domain.
 221  * @device: The device on which to allocate the protection domain.
 222  *
 223  * A protection domain object provides an association between QPs, shared
 224  * receive queues, address handles, memory regions, and memory windows.
 225  *
 226  * Every PD has a local_dma_lkey which can be used as the lkey value for local
 227  * memory operations.
 228  */
 229 struct ib_pd *ib_alloc_pd(struct ib_device *device)
 230 {
 231         struct ib_pd *pd;
 232         struct ib_device_attr devattr;
 233         int rc;
 234
 235         rc = ib_query_device(device, &devattr);
 236         if (rc)
 237                 return ERR_PTR(rc);
 238
 239         pd = device->alloc_pd(device, NULL, NULL);
 240         if (IS_ERR(pd))
 241                 return pd;
 242
 243         pd->device = device;
 244         pd->uobject = NULL;
 245         pd->local_mr = NULL;
 246         atomic_set(&pd->usecnt, 0);
 247
 248         if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
 249                 pd->local_dma_lkey = device->local_dma_lkey;
 250         else {
 251                 struct ib_mr *mr;
 252
 253                 mr = ib_get_dma_mr(pd, IB_ACCESS_LOCAL_WRITE);
 254                 if (IS_ERR(mr)) {
 255                         ib_dealloc_pd(pd);
 256                         return (struct ib_pd *)mr;
 257                 }
 258
 259                 pd->local_mr = mr;
 260                 pd->local_dma_lkey = pd->local_mr->lkey;
 261         }
 262         return pd;
 263 }
 264 EXPORT_SYMBOL(ib_alloc_pd);
 265
 266 /**
 267  * ib_dealloc_pd - Deallocates a protection domain.
 268  * @pd: The protection domain to deallocate.
 269  *
 270  * It is an error to call this function while any resources in the pd still
 271  * exist.  The caller is responsible to synchronously destroy them and
 272  * guarantee no new allocations will happen.
 273  */
 274 void ib_dealloc_pd(struct ib_pd *pd)
 275 {
 276         int ret;
 277
 278         if (pd->local_mr) {
 279                 ret = ib_dereg_mr(pd->local_mr);
 280                 WARN_ON(ret);
 281                 pd->local_mr = NULL;
 282         }
 283
 284         /* uverbs manipulates usecnt with proper locking, while the kabi
 285            requires the caller to guarantee we can't race here. */
 286         WARN_ON(atomic_read(&pd->usecnt));
 287
 288         /* Making delalloc_pd a void return is a WIP, no driver should return
 289            an error here. */
 290         ret = pd->device->dealloc_pd(pd);
 291         WARN_ONCE(ret, "Infiniband HW driver failed dealloc_pd");
 292 }
 293 EXPORT_SYMBOL(ib_dealloc_pd);
 294
 295 /* Address handles */
 296
 297 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
 298 {
 299         struct ib_ah *ah;
 300
 301         ah = pd->device->create_ah(pd, ah_attr);
 302
 303         if (!IS_ERR(ah)) {
 304                 ah->device  = pd->device;
 305                 ah->pd      = pd;
 306                 ah->uobject = NULL;
 307                 atomic_inc(&pd->usecnt);
 308         }
 309
 310         return ah;
 311 }
 312 EXPORT_SYMBOL(ib_create_ah);
 313
 314 struct find_gid_index_context {
 315         u16 vlan_id;
 316 };
 317
 318 static bool find_gid_index(const union ib_gid *gid,
 319                            const struct ib_gid_attr *gid_attr,
 320                            void *context)
 321 {
 322         struct find_gid_index_context *ctx =
 323                 (struct find_gid_index_context *)context;
 324
 325         if ((!!(ctx->vlan_id != 0xffff) == !is_vlan_dev(gid_attr->ndev)) ||
 326             (is_vlan_dev(gid_attr->ndev) &&
 327              vlan_dev_vlan_id(gid_attr->ndev) != ctx->vlan_id))
 328                 return false;
 329
 330         return true;
 331 }
 332
 333 static int get_sgid_index_from_eth(struct ib_device *device, u8 port_num,
 334                                    u16 vlan_id, const union ib_gid *sgid,
 335                                    u16 *gid_index)
 336 {
 337         struct find_gid_index_context context = {.vlan_id = vlan_id};
 338
 339         return ib_find_gid_by_filter(device, sgid, port_num, find_gid_index,
 340                                      &context, gid_index);
 341 }
 342
 343 int ib_init_ah_from_wc(struct ib_device *device, u8 port_num,
 344                        const struct ib_wc *wc, const struct ib_grh *grh,
 345                        struct ib_ah_attr *ah_attr)
 346 {
 347         u32 flow_class;
 348         u16 gid_index;
 349         int ret;
 350
 351         memset(ah_attr, 0, sizeof *ah_attr);
 352         if (rdma_cap_eth_ah(device, port_num)) {
 353                 u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ?
 354                                 wc->vlan_id : 0xffff;
 355
 356                 if (!(wc->wc_flags & IB_WC_GRH))
 357                         return -EPROTOTYPE;
 358
 359                 if (!(wc->wc_flags & IB_WC_WITH_SMAC) ||
 360                     !(wc->wc_flags & IB_WC_WITH_VLAN)) {
 361                         ret = rdma_addr_find_dmac_by_grh(&grh->dgid, &grh->sgid,
 362                                                          ah_attr->dmac,
 363                                                          wc->wc_flags & IB_WC_WITH_VLAN ?
 364                                                          NULL : &vlan_id,
 365                                                          0);
 366                         if (ret)
 367                                 return ret;
 368                 }
 369
 370                 ret = get_sgid_index_from_eth(device, port_num, vlan_id,
 371                                               &grh->dgid, &gid_index);
 372                 if (ret)
 373                         return ret;
 374
 375                 if (wc->wc_flags & IB_WC_WITH_SMAC)
 376                         memcpy(ah_attr->dmac, wc->smac, ETH_ALEN);
 377         }
 378
 379         ah_attr->dlid = wc->slid;
 380         ah_attr->sl = wc->sl;
 381         ah_attr->src_path_bits = wc->dlid_path_bits;
 382         ah_attr->port_num = port_num;
 383
 384         if (wc->wc_flags & IB_WC_GRH) {
 385                 ah_attr->ah_flags = IB_AH_GRH;
 386                 ah_attr->grh.dgid = grh->sgid;
 387
 388                 if (!rdma_cap_eth_ah(device, port_num)) {
 389                         ret = ib_find_cached_gid_by_port(device, &grh->dgid,
 390                                                          port_num, NULL,
 391                                                          &gid_index);
 392                         if (ret)
 393                                 return ret;
 394                 }
 395
 396                 ah_attr->grh.sgid_index = (u8) gid_index;
 397                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 398                 ah_attr->grh.flow_label = flow_class & 0xFFFFF;
 399                 ah_attr->grh.hop_limit = 0xFF;
 400                 ah_attr->grh.traffic_class = (flow_class >> 20) & 0xFF;
 401         }
 402         return 0;
 403 }
 404 EXPORT_SYMBOL(ib_init_ah_from_wc);
 405
 406 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
 407                                    const struct ib_grh *grh, u8 port_num)
 408 {
 409         struct ib_ah_attr ah_attr;
 410         int ret;
 411
 412         ret = ib_init_ah_from_wc(pd->device, port_num, wc, grh, &ah_attr);
 413         if (ret)
 414                 return ERR_PTR(ret);
 415
 416         return ib_create_ah(pd, &ah_attr);
 417 }
 418 EXPORT_SYMBOL(ib_create_ah_from_wc);
 419
 420 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 421 {
 422         return ah->device->modify_ah ?
 423                 ah->device->modify_ah(ah, ah_attr) :
 424                 -ENOSYS;
 425 }
 426 EXPORT_SYMBOL(ib_modify_ah);
 427
 428 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 429 {
 430         return ah->device->query_ah ?
 431                 ah->device->query_ah(ah, ah_attr) :
 432                 -ENOSYS;
 433 }
 434 EXPORT_SYMBOL(ib_query_ah);
 435
 436 int ib_destroy_ah(struct ib_ah *ah)
 437 {
 438         struct ib_pd *pd;
 439         int ret;
 440
 441         pd = ah->pd;
 442         ret = ah->device->destroy_ah(ah);
 443         if (!ret)
 444                 atomic_dec(&pd->usecnt);
 445
 446         return ret;
 447 }
 448 EXPORT_SYMBOL(ib_destroy_ah);
 449
 450 /* Shared receive queues */
 451
 452 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 453                              struct ib_srq_init_attr *srq_init_attr)
 454 {
 455         struct ib_srq *srq;
 456
 457         if (!pd->device->create_srq)
 458                 return ERR_PTR(-ENOSYS);
 459
 460         srq = pd->device->create_srq(pd, srq_init_attr, NULL);
 461
 462         if (!IS_ERR(srq)) {
 463                 srq->device        = pd->device;
 464                 srq->pd            = pd;
 465                 srq->uobject       = NULL;
 466                 srq->event_handler = srq_init_attr->event_handler;
 467                 srq->srq_context   = srq_init_attr->srq_context;
 468                 srq->srq_type      = srq_init_attr->srq_type;
 469                 if (srq->srq_type == IB_SRQT_XRC) {
 470                         srq->ext.xrc.xrcd = srq_init_attr->ext.xrc.xrcd;
 471                         srq->ext.xrc.cq   = srq_init_attr->ext.xrc.cq;
 472                         atomic_inc(&srq->ext.xrc.xrcd->usecnt);
 473                         atomic_inc(&srq->ext.xrc.cq->usecnt);
 474                 }
 475                 atomic_inc(&pd->usecnt);
 476                 atomic_set(&srq->usecnt, 0);
 477         }
 478
 479         return srq;
 480 }
 481 EXPORT_SYMBOL(ib_create_srq);
 482
 483 int ib_modify_srq(struct ib_srq *srq,
 484                   struct ib_srq_attr *srq_attr,
 485                   enum ib_srq_attr_mask srq_attr_mask)
 486 {
 487         return srq->device->modify_srq ?
 488                 srq->device->modify_srq(srq, srq_attr, srq_attr_mask, NULL) :
 489                 -ENOSYS;
 490 }
 491 EXPORT_SYMBOL(ib_modify_srq);
 492
 493 int ib_query_srq(struct ib_srq *srq,
 494                  struct ib_srq_attr *srq_attr)
 495 {
 496         return srq->device->query_srq ?
 497                 srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 498 }
 499 EXPORT_SYMBOL(ib_query_srq);
 500
 501 int ib_destroy_srq(struct ib_srq *srq)
 502 {
 503         struct ib_pd *pd;
 504         enum ib_srq_type srq_type;
 505         struct ib_xrcd *uninitialized_var(xrcd);
 506         struct ib_cq *uninitialized_var(cq);
 507         int ret;
 508
 509         if (atomic_read(&srq->usecnt))
 510                 return -EBUSY;
 511
 512         pd = srq->pd;
 513         srq_type = srq->srq_type;
 514         if (srq_type == IB_SRQT_XRC) {
 515                 xrcd = srq->ext.xrc.xrcd;
 516                 cq = srq->ext.xrc.cq;
 517         }
 518
 519         ret = srq->device->destroy_srq(srq);
 520         if (!ret) {
 521                 atomic_dec(&pd->usecnt);
 522                 if (srq_type == IB_SRQT_XRC) {
 523                         atomic_dec(&xrcd->usecnt);
 524                         atomic_dec(&cq->usecnt);
 525                 }
 526         }
 527
 528         return ret;
 529 }
 530 EXPORT_SYMBOL(ib_destroy_srq);
 531
 532 /* Queue pairs */
 533
 534 static void __ib_shared_qp_event_handler(struct ib_event *event, void *context)
 535 {
 536         struct ib_qp *qp = context;
 537         unsigned long flags;
 538
 539         spin_lock_irqsave(&qp->device->event_handler_lock, flags);
 540         list_for_each_entry(event->element.qp, &qp->open_list, open_list)
 541                 if (event->element.qp->event_handler)
 542                         event->element.qp->event_handler(event, event->element.qp->qp_context);
 543         spin_unlock_irqrestore(&qp->device->event_handler_lock, flags);
 544 }
 545
 546 static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp)
 547 {
 548         mutex_lock(&xrcd->tgt_qp_mutex);
 549         list_add(&qp->xrcd_list, &xrcd->tgt_qp_list);
 550         mutex_unlock(&xrcd->tgt_qp_mutex);
 551 }
 552
 553 static struct ib_qp *__ib_open_qp(struct ib_qp *real_qp,
 554                                   void (*event_handler)(struct ib_event *, void *),
 555                                   void *qp_context)
 556 {
 557         struct ib_qp *qp;
 558         unsigned long flags;
 559
 560         qp = kzalloc(sizeof *qp, GFP_KERNEL);
 561         if (!qp)
 562                 return ERR_PTR(-ENOMEM);
 563
 564         qp->real_qp = real_qp;
 565         atomic_inc(&real_qp->usecnt);
 566         qp->device = real_qp->device;
 567         qp->event_handler = event_handler;
 568         qp->qp_context = qp_context;
 569         qp->qp_num = real_qp->qp_num;
 570         qp->qp_type = real_qp->qp_type;
 571
 572         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
 573         list_add(&qp->open_list, &real_qp->open_list);
 574         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
 575
 576         return qp;
 577 }
 578
 579 struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd,
 580                          struct ib_qp_open_attr *qp_open_attr)
 581 {
 582         struct ib_qp *qp, *real_qp;
 583
 584         if (qp_open_attr->qp_type != IB_QPT_XRC_TGT)
 585                 return ERR_PTR(-EINVAL);
 586
 587         qp = ERR_PTR(-EINVAL);
 588         mutex_lock(&xrcd->tgt_qp_mutex);
 589         list_for_each_entry(real_qp, &xrcd->tgt_qp_list, xrcd_list) {
 590                 if (real_qp->qp_num == qp_open_attr->qp_num) {
 591                         qp = __ib_open_qp(real_qp, qp_open_attr->event_handler,
 592                                           qp_open_attr->qp_context);
 593                         break;
 594                 }
 595         }
 596         mutex_unlock(&xrcd->tgt_qp_mutex);
 597         return qp;
 598 }
 599 EXPORT_SYMBOL(ib_open_qp);
 600
 601 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 602                            struct ib_qp_init_attr *qp_init_attr)
 603 {
 604         struct ib_qp *qp, *real_qp;
 605         struct ib_device *device;
 606
 607         device = pd ? pd->device : qp_init_attr->xrcd->device;
 608         qp = device->create_qp(pd, qp_init_attr, NULL);
 609
 610         if (!IS_ERR(qp)) {
 611                 qp->device     = device;
 612                 qp->real_qp    = qp;
 613                 qp->uobject    = NULL;
 614                 qp->qp_type    = qp_init_attr->qp_type;
 615
 616                 atomic_set(&qp->usecnt, 0);
 617                 if (qp_init_attr->qp_type == IB_QPT_XRC_TGT) {
 618                         qp->event_handler = __ib_shared_qp_event_handler;
 619                         qp->qp_context = qp;
 620                         qp->pd = NULL;
 621                         qp->send_cq = qp->recv_cq = NULL;
 622                         qp->srq = NULL;
 623                         qp->xrcd = qp_init_attr->xrcd;
 624                         atomic_inc(&qp_init_attr->xrcd->usecnt);
 625                         INIT_LIST_HEAD(&qp->open_list);
 626
 627                         real_qp = qp;
 628                         qp = __ib_open_qp(real_qp, qp_init_attr->event_handler,
 629                                           qp_init_attr->qp_context);
 630                         if (!IS_ERR(qp))
 631                                 __ib_insert_xrcd_qp(qp_init_attr->xrcd, real_qp);
 632                         else
 633                                 real_qp->device->destroy_qp(real_qp);
 634                 } else {
 635                         qp->event_handler = qp_init_attr->event_handler;
 636                         qp->qp_context = qp_init_attr->qp_context;
 637                         if (qp_init_attr->qp_type == IB_QPT_XRC_INI) {
 638                                 qp->recv_cq = NULL;
 639                                 qp->srq = NULL;
 640                         } else {
 641                                 qp->recv_cq = qp_init_attr->recv_cq;
 642                                 atomic_inc(&qp_init_attr->recv_cq->usecnt);
 643                                 qp->srq = qp_init_attr->srq;
 644                                 if (qp->srq)
 645                                         atomic_inc(&qp_init_attr->srq->usecnt);
 646                         }
 647
 648                         qp->pd      = pd;
 649                         qp->send_cq = qp_init_attr->send_cq;
 650                         qp->xrcd    = NULL;
 651
 652                         atomic_inc(&pd->usecnt);
 653                         atomic_inc(&qp_init_attr->send_cq->usecnt);
 654                 }
 655         }
 656
 657         return qp;
 658 }
 659 EXPORT_SYMBOL(ib_create_qp);
 660
 661 static const struct {
 662         int                     valid;
 663         enum ib_qp_attr_mask    req_param[IB_QPT_MAX];
 664         enum ib_qp_attr_mask    opt_param[IB_QPT_MAX];
 665 } qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
 666         [IB_QPS_RESET] = {
 667                 [IB_QPS_RESET] = { .valid = 1 },
 668                 [IB_QPS_INIT]  = {
 669                         .valid = 1,
 670                         .req_param = {
 671                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 672                                                 IB_QP_PORT                      |
 673                                                 IB_QP_QKEY),
 674                                 [IB_QPT_RAW_PACKET] = IB_QP_PORT,
 675                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 676                                                 IB_QP_PORT                      |
 677                                                 IB_QP_ACCESS_FLAGS),
 678                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 679                                                 IB_QP_PORT                      |
 680                                                 IB_QP_ACCESS_FLAGS),
 681                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 682                                                 IB_QP_PORT                      |
 683                                                 IB_QP_ACCESS_FLAGS),
 684                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 685                                                 IB_QP_PORT                      |
 686                                                 IB_QP_ACCESS_FLAGS),
 687                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 688                                                 IB_QP_QKEY),
 689                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 690                                                 IB_QP_QKEY),
 691                         }
 692                 },
 693         },
 694         [IB_QPS_INIT]  = {
 695                 [IB_QPS_RESET] = { .valid = 1 },
 696                 [IB_QPS_ERR] =   { .valid = 1 },
 697                 [IB_QPS_INIT]  = {
 698                         .valid = 1,
 699                         .opt_param = {
 700                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 701                                                 IB_QP_PORT                      |
 702                                                 IB_QP_QKEY),
 703                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 704                                                 IB_QP_PORT                      |
 705                                                 IB_QP_ACCESS_FLAGS),
 706                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 707                                                 IB_QP_PORT                      |
 708                                                 IB_QP_ACCESS_FLAGS),
 709                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 710                                                 IB_QP_PORT                      |
 711                                                 IB_QP_ACCESS_FLAGS),
 712                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 713                                                 IB_QP_PORT                      |
 714                                                 IB_QP_ACCESS_FLAGS),
 715                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 716                                                 IB_QP_QKEY),
 717                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 718                                                 IB_QP_QKEY),
 719                         }
 720                 },
 721                 [IB_QPS_RTR]   = {
 722                         .valid = 1,
 723                         .req_param = {
 724                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 725                                                 IB_QP_PATH_MTU                  |
 726                                                 IB_QP_DEST_QPN                  |
 727                                                 IB_QP_RQ_PSN),
 728                                 [IB_QPT_RC]  = (IB_QP_AV                        |
 729                                                 IB_QP_PATH_MTU                  |
 730                                                 IB_QP_DEST_QPN                  |
 731                                                 IB_QP_RQ_PSN                    |
 732                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 733                                                 IB_QP_MIN_RNR_TIMER),
 734                                 [IB_QPT_XRC_INI] = (IB_QP_AV                    |
 735                                                 IB_QP_PATH_MTU                  |
 736                                                 IB_QP_DEST_QPN                  |
 737                                                 IB_QP_RQ_PSN),
 738                                 [IB_QPT_XRC_TGT] = (IB_QP_AV                    |
 739                                                 IB_QP_PATH_MTU                  |
 740                                                 IB_QP_DEST_QPN                  |
 741                                                 IB_QP_RQ_PSN                    |
 742                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 743                                                 IB_QP_MIN_RNR_TIMER),
 744                         },
 745                         .opt_param = {
 746                                  [IB_QPT_UD]  = (IB_QP_PKEY_INDEX               |
 747                                                  IB_QP_QKEY),
 748                                  [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
 749                                                  IB_QP_ACCESS_FLAGS             |
 750                                                  IB_QP_PKEY_INDEX),
 751                                  [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
 752                                                  IB_QP_ACCESS_FLAGS             |
 753                                                  IB_QP_PKEY_INDEX),
 754                                  [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH             |
 755                                                  IB_QP_ACCESS_FLAGS             |
 756                                                  IB_QP_PKEY_INDEX),
 757                                  [IB_QPT_XRC_TGT] = (IB_QP_ALT_PATH             |
 758                                                  IB_QP_ACCESS_FLAGS             |
 759                                                  IB_QP_PKEY_INDEX),
 760                                  [IB_QPT_SMI] = (IB_QP_PKEY_INDEX               |
 761                                                  IB_QP_QKEY),
 762                                  [IB_QPT_GSI] = (IB_QP_PKEY_INDEX               |
 763                                                  IB_QP_QKEY),
 764                          },
 765                 },
 766         },
 767         [IB_QPS_RTR]   = {
 768                 [IB_QPS_RESET] = { .valid = 1 },
 769                 [IB_QPS_ERR] =   { .valid = 1 },
 770                 [IB_QPS_RTS]   = {
 771                         .valid = 1,
 772                         .req_param = {
 773                                 [IB_QPT_UD]  = IB_QP_SQ_PSN,
 774                                 [IB_QPT_UC]  = IB_QP_SQ_PSN,
 775                                 [IB_QPT_RC]  = (IB_QP_TIMEOUT                   |
 776                                                 IB_QP_RETRY_CNT                 |
 777                                                 IB_QP_RNR_RETRY                 |
 778                                                 IB_QP_SQ_PSN                    |
 779                                                 IB_QP_MAX_QP_RD_ATOMIC),
 780                                 [IB_QPT_XRC_INI] = (IB_QP_TIMEOUT               |
 781                                                 IB_QP_RETRY_CNT                 |
 782                                                 IB_QP_RNR_RETRY                 |
 783                                                 IB_QP_SQ_PSN                    |
 784                                                 IB_QP_MAX_QP_RD_ATOMIC),
 785                                 [IB_QPT_XRC_TGT] = (IB_QP_TIMEOUT               |
 786                                                 IB_QP_SQ_PSN),
 787                                 [IB_QPT_SMI] = IB_QP_SQ_PSN,
 788                                 [IB_QPT_GSI] = IB_QP_SQ_PSN,
 789                         },
 790                         .opt_param = {
 791                                  [IB_QPT_UD]  = (IB_QP_CUR_STATE                |
 792                                                  IB_QP_QKEY),
 793                                  [IB_QPT_UC]  = (IB_QP_CUR_STATE                |
 794                                                  IB_QP_ALT_PATH                 |
 795                                                  IB_QP_ACCESS_FLAGS             |
 796                                                  IB_QP_PATH_MIG_STATE),
 797                                  [IB_QPT_RC]  = (IB_QP_CUR_STATE                |
 798                                                  IB_QP_ALT_PATH                 |
 799                                                  IB_QP_ACCESS_FLAGS             |
 800                                                  IB_QP_MIN_RNR_TIMER            |
 801                                                  IB_QP_PATH_MIG_STATE),
 802                                  [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE            |
 803                                                  IB_QP_ALT_PATH                 |
 804                                                  IB_QP_ACCESS_FLAGS             |
 805                                                  IB_QP_PATH_MIG_STATE),
 806                                  [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE            |
 807                                                  IB_QP_ALT_PATH                 |
 808                                                  IB_QP_ACCESS_FLAGS             |
 809                                                  IB_QP_MIN_RNR_TIMER            |
 810                                                  IB_QP_PATH_MIG_STATE),
 811                                  [IB_QPT_SMI] = (IB_QP_CUR_STATE                |
 812                                                  IB_QP_QKEY),
 813                                  [IB_QPT_GSI] = (IB_QP_CUR_STATE                |
 814                                                  IB_QP_QKEY),
 815                          }
 816                 }
 817         },
 818         [IB_QPS_RTS]   = {
 819                 [IB_QPS_RESET] = { .valid = 1 },
 820                 [IB_QPS_ERR] =   { .valid = 1 },
 821                 [IB_QPS_RTS]   = {
 822                         .valid = 1,
 823                         .opt_param = {
 824                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 825                                                 IB_QP_QKEY),
 826                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 827                                                 IB_QP_ACCESS_FLAGS              |
 828                                                 IB_QP_ALT_PATH                  |
 829                                                 IB_QP_PATH_MIG_STATE),
 830                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 831                                                 IB_QP_ACCESS_FLAGS              |
 832                                                 IB_QP_ALT_PATH                  |
 833                                                 IB_QP_PATH_MIG_STATE            |
 834                                                 IB_QP_MIN_RNR_TIMER),
 835                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
 836                                                 IB_QP_ACCESS_FLAGS              |
 837                                                 IB_QP_ALT_PATH                  |
 838                                                 IB_QP_PATH_MIG_STATE),
 839                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
 840                                                 IB_QP_ACCESS_FLAGS              |
 841                                                 IB_QP_ALT_PATH                  |
 842                                                 IB_QP_PATH_MIG_STATE            |
 843                                                 IB_QP_MIN_RNR_TIMER),
 844                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 845                                                 IB_QP_QKEY),
 846                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 847                                                 IB_QP_QKEY),
 848                         }
 849                 },
 850                 [IB_QPS_SQD]   = {
 851                         .valid = 1,
 852                         .opt_param = {
 853                                 [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 854                                 [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 855                                 [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 856                                 [IB_QPT_XRC_INI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 857                                 [IB_QPT_XRC_TGT] = IB_QP_EN_SQD_ASYNC_NOTIFY, /* ??? */
 858                                 [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 859                                 [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
 860                         }
 861                 },
 862         },
 863         [IB_QPS_SQD]   = {
 864                 [IB_QPS_RESET] = { .valid = 1 },
 865                 [IB_QPS_ERR] =   { .valid = 1 },
 866                 [IB_QPS_RTS]   = {
 867                         .valid = 1,
 868                         .opt_param = {
 869                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 870                                                 IB_QP_QKEY),
 871                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 872                                                 IB_QP_ALT_PATH                  |
 873                                                 IB_QP_ACCESS_FLAGS              |
 874                                                 IB_QP_PATH_MIG_STATE),
 875                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 876                                                 IB_QP_ALT_PATH                  |
 877                                                 IB_QP_ACCESS_FLAGS              |
 878                                                 IB_QP_MIN_RNR_TIMER             |
 879                                                 IB_QP_PATH_MIG_STATE),
 880                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
 881                                                 IB_QP_ALT_PATH                  |
 882                                                 IB_QP_ACCESS_FLAGS              |
 883                                                 IB_QP_PATH_MIG_STATE),
 884                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
 885                                                 IB_QP_ALT_PATH                  |
 886                                                 IB_QP_ACCESS_FLAGS              |
 887                                                 IB_QP_MIN_RNR_TIMER             |
 888                                                 IB_QP_PATH_MIG_STATE),
 889                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 890                                                 IB_QP_QKEY),
 891                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 892                                                 IB_QP_QKEY),
 893                         }
 894                 },
 895                 [IB_QPS_SQD]   = {
 896                         .valid = 1,
 897                         .opt_param = {
 898                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 899                                                 IB_QP_QKEY),
 900                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 901                                                 IB_QP_ALT_PATH                  |
 902                                                 IB_QP_ACCESS_FLAGS              |
 903                                                 IB_QP_PKEY_INDEX                |
 904                                                 IB_QP_PATH_MIG_STATE),
 905                                 [IB_QPT_RC]  = (IB_QP_PORT                      |
 906                                                 IB_QP_AV                        |
 907                                                 IB_QP_TIMEOUT                   |
 908                                                 IB_QP_RETRY_CNT                 |
 909                                                 IB_QP_RNR_RETRY                 |
 910                                                 IB_QP_MAX_QP_RD_ATOMIC          |
 911                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 912                                                 IB_QP_ALT_PATH                  |
 913                                                 IB_QP_ACCESS_FLAGS              |
 914                                                 IB_QP_PKEY_INDEX                |
 915                                                 IB_QP_MIN_RNR_TIMER             |
 916                                                 IB_QP_PATH_MIG_STATE),
 917                                 [IB_QPT_XRC_INI] = (IB_QP_PORT                  |
 918                                                 IB_QP_AV                        |
 919                                                 IB_QP_TIMEOUT                   |
 920                                                 IB_QP_RETRY_CNT                 |
 921                                                 IB_QP_RNR_RETRY                 |
 922                                                 IB_QP_MAX_QP_RD_ATOMIC          |
 923                                                 IB_QP_ALT_PATH                  |
 924                                                 IB_QP_ACCESS_FLAGS              |
 925                                                 IB_QP_PKEY_INDEX                |
 926                                                 IB_QP_PATH_MIG_STATE),
 927                                 [IB_QPT_XRC_TGT] = (IB_QP_PORT                  |
 928                                                 IB_QP_AV                        |
 929                                                 IB_QP_TIMEOUT                   |
 930                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 931                                                 IB_QP_ALT_PATH                  |
 932                                                 IB_QP_ACCESS_FLAGS              |
 933                                                 IB_QP_PKEY_INDEX                |
 934                                                 IB_QP_MIN_RNR_TIMER             |
 935                                                 IB_QP_PATH_MIG_STATE),
 936                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 937                                                 IB_QP_QKEY),
 938                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 939                                                 IB_QP_QKEY),
 940                         }
 941                 }
 942         },
 943         [IB_QPS_SQE]   = {
 944                 [IB_QPS_RESET] = { .valid = 1 },
 945                 [IB_QPS_ERR] =   { .valid = 1 },
 946                 [IB_QPS_RTS]   = {
 947                         .valid = 1,
 948                         .opt_param = {
 949                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 950                                                 IB_QP_QKEY),
 951                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 952                                                 IB_QP_ACCESS_FLAGS),
 953                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 954                                                 IB_QP_QKEY),
 955                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 956                                                 IB_QP_QKEY),
 957                         }
 958                 }
 959         },
 960         [IB_QPS_ERR] = {
 961                 [IB_QPS_RESET] = { .valid = 1 },
 962                 [IB_QPS_ERR] =   { .valid = 1 }
 963         }
 964 };
 965
 966 int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
 967                        enum ib_qp_type type, enum ib_qp_attr_mask mask,
 968                        enum rdma_link_layer ll)
 969 {
 970         enum ib_qp_attr_mask req_param, opt_param;
 971
 972         if (cur_state  < 0 || cur_state  > IB_QPS_ERR ||
 973             next_state < 0 || next_state > IB_QPS_ERR)
 974                 return 0;
 975
 976         if (mask & IB_QP_CUR_STATE  &&
 977             cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
 978             cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
 979                 return 0;
 980
 981         if (!qp_state_table[cur_state][next_state].valid)
 982                 return 0;
 983
 984         req_param = qp_state_table[cur_state][next_state].req_param[type];
 985         opt_param = qp_state_table[cur_state][next_state].opt_param[type];
 986
 987         if ((mask & req_param) != req_param)
 988                 return 0;
 989
 990         if (mask & ~(req_param | opt_param | IB_QP_STATE))
 991                 return 0;
 992
 993         return 1;
 994 }
 995 EXPORT_SYMBOL(ib_modify_qp_is_ok);
 996
 997 int ib_resolve_eth_dmac(struct ib_qp *qp,
 998                         struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 999 {
1000         int           ret = 0;
1001
1002         if (*qp_attr_mask & IB_QP_AV) {
1003                 if (qp_attr->ah_attr.port_num < rdma_start_port(qp->device) ||
1004                     qp_attr->ah_attr.port_num > rdma_end_port(qp->device))
1005                         return -EINVAL;
1006
1007                 if (!rdma_cap_eth_ah(qp->device, qp_attr->ah_attr.port_num))
1008                         return 0;
1009
1010                 if (rdma_link_local_addr((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw)) {
1011                         rdma_get_ll_mac((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw,
1012                                         qp_attr->ah_attr.dmac);
1013                 } else {
1014                         union ib_gid            sgid;
1015                         struct ib_gid_attr      sgid_attr;
1016                         int                     ifindex;
1017
1018                         ret = ib_query_gid(qp->device,
1019                                            qp_attr->ah_attr.port_num,
1020                                            qp_attr->ah_attr.grh.sgid_index,
1021                                            &sgid, &sgid_attr);
1022
1023                         if (ret || !sgid_attr.ndev) {
1024                                 if (!ret)
1025                                         ret = -ENXIO;
1026                                 goto out;
1027                         }
1028
1029                         ifindex = sgid_attr.ndev->ifindex;
1030
1031                         ret = rdma_addr_find_dmac_by_grh(&sgid,
1032                                                          &qp_attr->ah_attr.grh.dgid,
1033                                                          qp_attr->ah_attr.dmac,
1034                                                          NULL, ifindex);
1035
1036                         dev_put(sgid_attr.ndev);
1037                 }
1038         }
1039 out:
1040         return ret;
1041 }
1042 EXPORT_SYMBOL(ib_resolve_eth_dmac);
1043
1044
1045 int ib_modify_qp(struct ib_qp *qp,
1046                  struct ib_qp_attr *qp_attr,
1047                  int qp_attr_mask)
1048 {
1049         int ret;
1050
1051         ret = ib_resolve_eth_dmac(qp, qp_attr, &qp_attr_mask);
1052         if (ret)
1053                 return ret;
1054
1055         return qp->device->modify_qp(qp->real_qp, qp_attr, qp_attr_mask, NULL);
1056 }
1057 EXPORT_SYMBOL(ib_modify_qp);
1058
1059 int ib_query_qp(struct ib_qp *qp,
1060                 struct ib_qp_attr *qp_attr,
1061                 int qp_attr_mask,
1062                 struct ib_qp_init_attr *qp_init_attr)
1063 {
1064         return qp->device->query_qp ?
1065                 qp->device->query_qp(qp->real_qp, qp_attr, qp_attr_mask, qp_init_attr) :
1066                 -ENOSYS;
1067 }
1068 EXPORT_SYMBOL(ib_query_qp);
1069
1070 int ib_close_qp(struct ib_qp *qp)
1071 {
1072         struct ib_qp *real_qp;
1073         unsigned long flags;
1074
1075         real_qp = qp->real_qp;
1076         if (real_qp == qp)
1077                 return -EINVAL;
1078
1079         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
1080         list_del(&qp->open_list);
1081         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
1082
1083         atomic_dec(&real_qp->usecnt);
1084         kfree(qp);
1085
1086         return 0;
1087 }
1088 EXPORT_SYMBOL(ib_close_qp);
1089
1090 static int __ib_destroy_shared_qp(struct ib_qp *qp)
1091 {
1092         struct ib_xrcd *xrcd;
1093         struct ib_qp *real_qp;
1094         int ret;
1095
1096         real_qp = qp->real_qp;
1097         xrcd = real_qp->xrcd;
1098
1099         mutex_lock(&xrcd->tgt_qp_mutex);
1100         ib_close_qp(qp);
1101         if (atomic_read(&real_qp->usecnt) == 0)
1102                 list_del(&real_qp->xrcd_list);
1103         else
1104                 real_qp = NULL;
1105         mutex_unlock(&xrcd->tgt_qp_mutex);
1106
1107         if (real_qp) {
1108                 ret = ib_destroy_qp(real_qp);
1109                 if (!ret)
1110                         atomic_dec(&xrcd->usecnt);
1111                 else
1112                         __ib_insert_xrcd_qp(xrcd, real_qp);
1113         }
1114
1115         return 0;
1116 }
1117
1118 int ib_destroy_qp(struct ib_qp *qp)
1119 {
1120         struct ib_pd *pd;
1121         struct ib_cq *scq, *rcq;
1122         struct ib_srq *srq;
1123         int ret;
1124
1125         if (atomic_read(&qp->usecnt))
1126                 return -EBUSY;
1127
1128         if (qp->real_qp != qp)
1129                 return __ib_destroy_shared_qp(qp);
1130
1131         pd   = qp->pd;
1132         scq  = qp->send_cq;
1133         rcq  = qp->recv_cq;
1134         srq  = qp->srq;
1135
1136         ret = qp->device->destroy_qp(qp);
1137         if (!ret) {
1138                 if (pd)
1139                         atomic_dec(&pd->usecnt);
1140                 if (scq)
1141                         atomic_dec(&scq->usecnt);
1142                 if (rcq)
1143                         atomic_dec(&rcq->usecnt);
1144                 if (srq)
1145                         atomic_dec(&srq->usecnt);
1146         }
1147
1148         return ret;
1149 }
1150 EXPORT_SYMBOL(ib_destroy_qp);
1151
1152 /* Completion queues */
1153
1154 struct ib_cq *ib_create_cq(struct ib_device *device,
1155                            ib_comp_handler comp_handler,
1156                            void (*event_handler)(struct ib_event *, void *),
1157                            void *cq_context,
1158                            const struct ib_cq_init_attr *cq_attr)
1159 {
1160         struct ib_cq *cq;
1161
1162         cq = device->create_cq(device, cq_attr, NULL, NULL);
1163
1164         if (!IS_ERR(cq)) {
1165                 cq->device        = device;
1166                 cq->uobject       = NULL;
1167                 cq->comp_handler  = comp_handler;
1168                 cq->event_handler = event_handler;
1169                 cq->cq_context    = cq_context;
1170                 atomic_set(&cq->usecnt, 0);
1171         }
1172
1173         return cq;
1174 }
1175 EXPORT_SYMBOL(ib_create_cq);
1176
1177 int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1178 {
1179         return cq->device->modify_cq ?
1180                 cq->device->modify_cq(cq, cq_count, cq_period) : -ENOSYS;
1181 }
1182 EXPORT_SYMBOL(ib_modify_cq);
1183
1184 int ib_destroy_cq(struct ib_cq *cq)
1185 {
1186         if (atomic_read(&cq->usecnt))
1187                 return -EBUSY;
1188
1189         return cq->device->destroy_cq(cq);
1190 }
1191 EXPORT_SYMBOL(ib_destroy_cq);
1192
1193 int ib_resize_cq(struct ib_cq *cq, int cqe)
1194 {
1195         return cq->device->resize_cq ?
1196                 cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS;
1197 }
1198 EXPORT_SYMBOL(ib_resize_cq);
1199
1200 /* Memory regions */
1201
1202 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
1203 {
1204         struct ib_mr *mr;
1205         int err;
1206
1207         err = ib_check_mr_access(mr_access_flags);
1208         if (err)
1209                 return ERR_PTR(err);
1210
1211         mr = pd->device->get_dma_mr(pd, mr_access_flags);
1212
1213         if (!IS_ERR(mr)) {
1214                 mr->device  = pd->device;
1215                 mr->pd      = pd;
1216                 mr->uobject = NULL;
1217                 atomic_inc(&pd->usecnt);
1218                 atomic_set(&mr->usecnt, 0);
1219         }
1220
1221         return mr;
1222 }
1223 EXPORT_SYMBOL(ib_get_dma_mr);
1224
1225 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
1226 {
1227         return mr->device->query_mr ?
1228                 mr->device->query_mr(mr, mr_attr) : -ENOSYS;
1229 }
1230 EXPORT_SYMBOL(ib_query_mr);
1231
1232 int ib_dereg_mr(struct ib_mr *mr)
1233 {
1234         struct ib_pd *pd;
1235         int ret;
1236
1237         if (atomic_read(&mr->usecnt))
1238                 return -EBUSY;
1239
1240         pd = mr->pd;
1241         ret = mr->device->dereg_mr(mr);
1242         if (!ret)
1243                 atomic_dec(&pd->usecnt);
1244
1245         return ret;
1246 }
1247 EXPORT_SYMBOL(ib_dereg_mr);
1248
1249 /**
1250  * ib_alloc_mr() - Allocates a memory region
1251  * @pd:            protection domain associated with the region
1252  * @mr_type:       memory region type
1253  * @max_num_sg:    maximum sg entries available for registration.
1254  *
1255  * Notes:
1256  * Memory registeration page/sg lists must not exceed max_num_sg.
1257  * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed
1258  * max_num_sg * used_page_size.
1259  *
1260  */
1261 struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
1262                           enum ib_mr_type mr_type,
1263                           u32 max_num_sg)
1264 {
1265         struct ib_mr *mr;
1266
1267         if (!pd->device->alloc_mr)
1268                 return ERR_PTR(-ENOSYS);
1269
1270         mr = pd->device->alloc_mr(pd, mr_type, max_num_sg);
1271         if (!IS_ERR(mr)) {
1272                 mr->device  = pd->device;
1273                 mr->pd      = pd;
1274                 mr->uobject = NULL;
1275                 atomic_inc(&pd->usecnt);
1276                 atomic_set(&mr->usecnt, 0);
1277         }
1278
1279         return mr;
1280 }
1281 EXPORT_SYMBOL(ib_alloc_mr);
1282
1283 /* Memory windows */
1284
1285 struct ib_mw *ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type)
1286 {
1287         struct ib_mw *mw;
1288
1289         if (!pd->device->alloc_mw)
1290                 return ERR_PTR(-ENOSYS);
1291
1292         mw = pd->device->alloc_mw(pd, type);
1293         if (!IS_ERR(mw)) {
1294                 mw->device  = pd->device;
1295                 mw->pd      = pd;
1296                 mw->uobject = NULL;
1297                 mw->type    = type;
1298                 atomic_inc(&pd->usecnt);
1299         }
1300
1301         return mw;
1302 }
1303 EXPORT_SYMBOL(ib_alloc_mw);
1304
1305 int ib_dealloc_mw(struct ib_mw *mw)
1306 {
1307         struct ib_pd *pd;
1308         int ret;
1309
1310         pd = mw->pd;
1311         ret = mw->device->dealloc_mw(mw);
1312         if (!ret)
1313                 atomic_dec(&pd->usecnt);
1314
1315         return ret;
1316 }
1317 EXPORT_SYMBOL(ib_dealloc_mw);
1318
1319 /* "Fast" memory regions */
1320
1321 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
1322                             int mr_access_flags,
1323                             struct ib_fmr_attr *fmr_attr)
1324 {
1325         struct ib_fmr *fmr;
1326
1327         if (!pd->device->alloc_fmr)
1328                 return ERR_PTR(-ENOSYS);
1329
1330         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
1331         if (!IS_ERR(fmr)) {
1332                 fmr->device = pd->device;
1333                 fmr->pd     = pd;
1334                 atomic_inc(&pd->usecnt);
1335         }
1336
1337         return fmr;
1338 }
1339 EXPORT_SYMBOL(ib_alloc_fmr);
1340
1341 int ib_unmap_fmr(struct list_head *fmr_list)
1342 {
1343         struct ib_fmr *fmr;
1344
1345         if (list_empty(fmr_list))
1346                 return 0;
1347
1348         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
1349         return fmr->device->unmap_fmr(fmr_list);
1350 }
1351 EXPORT_SYMBOL(ib_unmap_fmr);
1352
1353 int ib_dealloc_fmr(struct ib_fmr *fmr)
1354 {
1355         struct ib_pd *pd;
1356         int ret;
1357
1358         pd = fmr->pd;
1359         ret = fmr->device->dealloc_fmr(fmr);
1360         if (!ret)
1361                 atomic_dec(&pd->usecnt);
1362
1363         return ret;
1364 }
1365 EXPORT_SYMBOL(ib_dealloc_fmr);
1366
1367 /* Multicast groups */
1368
1369 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1370 {
1371         int ret;
1372
1373         if (!qp->device->attach_mcast)
1374                 return -ENOSYS;
1375         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1376                 return -EINVAL;
1377
1378         ret = qp->device->attach_mcast(qp, gid, lid);
1379         if (!ret)
1380                 atomic_inc(&qp->usecnt);
1381         return ret;
1382 }
1383 EXPORT_SYMBOL(ib_attach_mcast);
1384
1385 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1386 {
1387         int ret;
1388
1389         if (!qp->device->detach_mcast)
1390                 return -ENOSYS;
1391         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1392                 return -EINVAL;
1393
1394         ret = qp->device->detach_mcast(qp, gid, lid);
1395         if (!ret)
1396                 atomic_dec(&qp->usecnt);
1397         return ret;
1398 }
1399 EXPORT_SYMBOL(ib_detach_mcast);
1400
1401 struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device)
1402 {
1403         struct ib_xrcd *xrcd;
1404
1405         if (!device->alloc_xrcd)
1406                 return ERR_PTR(-ENOSYS);
1407
1408         xrcd = device->alloc_xrcd(device, NULL, NULL);
1409         if (!IS_ERR(xrcd)) {
1410                 xrcd->device = device;
1411                 xrcd->inode = NULL;
1412                 atomic_set(&xrcd->usecnt, 0);
1413                 mutex_init(&xrcd->tgt_qp_mutex);
1414                 INIT_LIST_HEAD(&xrcd->tgt_qp_list);
1415         }
1416
1417         return xrcd;
1418 }
1419 EXPORT_SYMBOL(ib_alloc_xrcd);
1420
1421 int ib_dealloc_xrcd(struct ib_xrcd *xrcd)
1422 {
1423         struct ib_qp *qp;
1424         int ret;
1425
1426         if (atomic_read(&xrcd->usecnt))
1427                 return -EBUSY;
1428
1429         while (!list_empty(&xrcd->tgt_qp_list)) {
1430                 qp = list_entry(xrcd->tgt_qp_list.next, struct ib_qp, xrcd_list);
1431                 ret = ib_destroy_qp(qp);
1432                 if (ret)
1433                         return ret;
1434         }
1435
1436         return xrcd->device->dealloc_xrcd(xrcd);
1437 }
1438 EXPORT_SYMBOL(ib_dealloc_xrcd);
1439
1440 struct ib_flow *ib_create_flow(struct ib_qp *qp,
1441                                struct ib_flow_attr *flow_attr,
1442                                int domain)
1443 {
1444         struct ib_flow *flow_id;
1445         if (!qp->device->create_flow)
1446                 return ERR_PTR(-ENOSYS);
1447
1448         flow_id = qp->device->create_flow(qp, flow_attr, domain);
1449         if (!IS_ERR(flow_id))
1450                 atomic_inc(&qp->usecnt);
1451         return flow_id;
1452 }
1453 EXPORT_SYMBOL(ib_create_flow);
1454
1455 int ib_destroy_flow(struct ib_flow *flow_id)
1456 {
1457         int err;
1458         struct ib_qp *qp = flow_id->qp;
1459
1460         err = qp->device->destroy_flow(flow_id);
1461         if (!err)
1462                 atomic_dec(&qp->usecnt);
1463         return err;
1464 }
1465 EXPORT_SYMBOL(ib_destroy_flow);
1466
1467 int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
1468                        struct ib_mr_status *mr_status)
1469 {
1470         return mr->device->check_mr_status ?
1471                 mr->device->check_mr_status(mr, check_mask, mr_status) : -ENOSYS;
1472 }
1473 EXPORT_SYMBOL(ib_check_mr_status);
1474
1475 /**
1476  * ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list
1477  *     and set it the memory region.
1478  * @mr:            memory region
1479  * @sg:            dma mapped scatterlist
1480  * @sg_nents:      number of entries in sg
1481  * @page_size:     page vector desired page size
1482  *
1483  * Constraints:
1484  * - The first sg element is allowed to have an offset.
1485  * - Each sg element must be aligned to page_size (or physically
1486  *   contiguous to the previous element). In case an sg element has a
1487  *   non contiguous offset, the mapping prefix will not include it.
1488  * - The last sg element is allowed to have length less than page_size.
1489  * - If sg_nents total byte length exceeds the mr max_num_sge * page_size
1490  *   then only max_num_sg entries will be mapped.
1491  *
1492  * Returns the number of sg elements that were mapped to the memory region.
1493  *
1494  * After this completes successfully, the  memory region
1495  * is ready for registration.
1496  */
1497 int ib_map_mr_sg(struct ib_mr *mr,
1498                  struct scatterlist *sg,
1499                  int sg_nents,
1500                  unsigned int page_size)
1501 {
1502         if (unlikely(!mr->device->map_mr_sg))
1503                 return -ENOSYS;
1504
1505         mr->page_size = page_size;
1506
1507         return mr->device->map_mr_sg(mr, sg, sg_nents);
1508 }
1509 EXPORT_SYMBOL(ib_map_mr_sg);
1510
1511 /**
1512  * ib_sg_to_pages() - Convert the largest prefix of a sg list
1513  *     to a page vector
1514  * @mr:            memory region
1515  * @sgl:           dma mapped scatterlist
1516  * @sg_nents:      number of entries in sg
1517  * @set_page:      driver page assignment function pointer
1518  *
1519  * Core service helper for drivers to convert the largest
1520  * prefix of given sg list to a page vector. The sg list
1521  * prefix converted is the prefix that meet the requirements
1522  * of ib_map_mr_sg.
1523  *
1524  * Returns the number of sg elements that were assigned to
1525  * a page vector.
1526  */
1527 int ib_sg_to_pages(struct ib_mr *mr,
1528                    struct scatterlist *sgl,
1529                    int sg_nents,
1530                    int (*set_page)(struct ib_mr *, u64))
1531 {
1532         struct scatterlist *sg;
1533         u64 last_end_dma_addr = 0, last_page_addr = 0;
1534         unsigned int last_page_off = 0;
1535         u64 page_mask = ~((u64)mr->page_size - 1);
1536         int i, ret;
1537
1538         mr->iova = sg_dma_address(&sgl[0]);
1539         mr->length = 0;
1540
1541         for_each_sg(sgl, sg, sg_nents, i) {
1542                 u64 dma_addr = sg_dma_address(sg);
1543                 unsigned int dma_len = sg_dma_len(sg);
1544                 u64 end_dma_addr = dma_addr + dma_len;
1545                 u64 page_addr = dma_addr & page_mask;
1546
1547                 /*
1548                  * For the second and later elements, check whether either the
1549                  * end of element i-1 or the start of element i is not aligned
1550                  * on a page boundary.
1551                  */
1552                 if (i && (last_page_off != 0 || page_addr != dma_addr)) {
1553                         /* Stop mapping if there is a gap. */
1554                         if (last_end_dma_addr != dma_addr)
1555                                 break;
1556
1557                         /*
1558                          * Coalesce this element with the last. If it is small
1559                          * enough just update mr->length. Otherwise start
1560                          * mapping from the next page.
1561                          */
1562                         goto next_page;
1563                 }
1564
1565                 do {
1566                         ret = set_page(mr, page_addr);
1567                         if (unlikely(ret < 0))
1568                                 return i ? : ret;
1569 next_page:
1570                         page_addr += mr->page_size;
1571                 } while (page_addr < end_dma_addr);
1572
1573                 mr->length += dma_len;
1574                 last_end_dma_addr = end_dma_addr;
1575                 last_page_addr = end_dma_addr & page_mask;
1576                 last_page_off = end_dma_addr & ~page_mask;
1577         }
1578
1579         return i;
1580 }
1581 EXPORT_SYMBOL(ib_sg_to_pages);