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
 233         pd = device->alloc_pd(device, NULL, NULL);
 234         if (IS_ERR(pd))
 235                 return pd;
 236
 237         pd->device = device;
 238         pd->uobject = NULL;
 239         pd->local_mr = NULL;
 240         atomic_set(&pd->usecnt, 0);
 241
 242         if (device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
 243                 pd->local_dma_lkey = device->local_dma_lkey;
 244         else {
 245                 struct ib_mr *mr;
 246
 247                 mr = ib_get_dma_mr(pd, IB_ACCESS_LOCAL_WRITE);
 248                 if (IS_ERR(mr)) {
 249                         ib_dealloc_pd(pd);
 250                         return (struct ib_pd *)mr;
 251                 }
 252
 253                 pd->local_mr = mr;
 254                 pd->local_dma_lkey = pd->local_mr->lkey;
 255         }
 256         return pd;
 257 }
 258 EXPORT_SYMBOL(ib_alloc_pd);
 259
 260 /**
 261  * ib_dealloc_pd - Deallocates a protection domain.
 262  * @pd: The protection domain to deallocate.
 263  *
 264  * It is an error to call this function while any resources in the pd still
 265  * exist.  The caller is responsible to synchronously destroy them and
 266  * guarantee no new allocations will happen.
 267  */
 268 void ib_dealloc_pd(struct ib_pd *pd)
 269 {
 270         int ret;
 271
 272         if (pd->local_mr) {
 273                 ret = ib_dereg_mr(pd->local_mr);
 274                 WARN_ON(ret);
 275                 pd->local_mr = NULL;
 276         }
 277
 278         /* uverbs manipulates usecnt with proper locking, while the kabi
 279            requires the caller to guarantee we can't race here. */
 280         WARN_ON(atomic_read(&pd->usecnt));
 281
 282         /* Making delalloc_pd a void return is a WIP, no driver should return
 283            an error here. */
 284         ret = pd->device->dealloc_pd(pd);
 285         WARN_ONCE(ret, "Infiniband HW driver failed dealloc_pd");
 286 }
 287 EXPORT_SYMBOL(ib_dealloc_pd);
 288
 289 /* Address handles */
 290
 291 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
 292 {
 293         struct ib_ah *ah;
 294
 295         ah = pd->device->create_ah(pd, ah_attr);
 296
 297         if (!IS_ERR(ah)) {
 298                 ah->device  = pd->device;
 299                 ah->pd      = pd;
 300                 ah->uobject = NULL;
 301                 atomic_inc(&pd->usecnt);
 302         }
 303
 304         return ah;
 305 }
 306 EXPORT_SYMBOL(ib_create_ah);
 307
 308 static int ib_get_header_version(const union rdma_network_hdr *hdr)
 309 {
 310         const struct iphdr *ip4h = (struct iphdr *)&hdr->roce4grh;
 311         struct iphdr ip4h_checked;
 312         const struct ipv6hdr *ip6h = (struct ipv6hdr *)&hdr->ibgrh;
 313
 314         /* If it's IPv6, the version must be 6, otherwise, the first
 315          * 20 bytes (before the IPv4 header) are garbled.
 316          */
 317         if (ip6h->version != 6)
 318                 return (ip4h->version == 4) ? 4 : 0;
 319         /* version may be 6 or 4 because the first 20 bytes could be garbled */
 320
 321         /* RoCE v2 requires no options, thus header length
 322          * must be 5 words
 323          */
 324         if (ip4h->ihl != 5)
 325                 return 6;
 326
 327         /* Verify checksum.
 328          * We can't write on scattered buffers so we need to copy to
 329          * temp buffer.
 330          */
 331         memcpy(&ip4h_checked, ip4h, sizeof(ip4h_checked));
 332         ip4h_checked.check = 0;
 333         ip4h_checked.check = ip_fast_csum((u8 *)&ip4h_checked, 5);
 334         /* if IPv4 header checksum is OK, believe it */
 335         if (ip4h->check == ip4h_checked.check)
 336                 return 4;
 337         return 6;
 338 }
 339
 340 static enum rdma_network_type ib_get_net_type_by_grh(struct ib_device *device,
 341                                                      u8 port_num,
 342                                                      const struct ib_grh *grh)
 343 {
 344         int grh_version;
 345
 346         if (rdma_protocol_ib(device, port_num))
 347                 return RDMA_NETWORK_IB;
 348
 349         grh_version = ib_get_header_version((union rdma_network_hdr *)grh);
 350
 351         if (grh_version == 4)
 352                 return RDMA_NETWORK_IPV4;
 353
 354         if (grh->next_hdr == IPPROTO_UDP)
 355                 return RDMA_NETWORK_IPV6;
 356
 357         return RDMA_NETWORK_ROCE_V1;
 358 }
 359
 360 struct find_gid_index_context {
 361         u16 vlan_id;
 362         enum ib_gid_type gid_type;
 363 };
 364
 365 static bool find_gid_index(const union ib_gid *gid,
 366                            const struct ib_gid_attr *gid_attr,
 367                            void *context)
 368 {
 369         struct find_gid_index_context *ctx =
 370                 (struct find_gid_index_context *)context;
 371
 372         if (ctx->gid_type != gid_attr->gid_type)
 373                 return false;
 374
 375         if ((!!(ctx->vlan_id != 0xffff) == !is_vlan_dev(gid_attr->ndev)) ||
 376             (is_vlan_dev(gid_attr->ndev) &&
 377              vlan_dev_vlan_id(gid_attr->ndev) != ctx->vlan_id))
 378                 return false;
 379
 380         return true;
 381 }
 382
 383 static int get_sgid_index_from_eth(struct ib_device *device, u8 port_num,
 384                                    u16 vlan_id, const union ib_gid *sgid,
 385                                    enum ib_gid_type gid_type,
 386                                    u16 *gid_index)
 387 {
 388         struct find_gid_index_context context = {.vlan_id = vlan_id,
 389                                                  .gid_type = gid_type};
 390
 391         return ib_find_gid_by_filter(device, sgid, port_num, find_gid_index,
 392                                      &context, gid_index);
 393 }
 394
 395 static int get_gids_from_rdma_hdr(union rdma_network_hdr *hdr,
 396                                   enum rdma_network_type net_type,
 397                                   union ib_gid *sgid, union ib_gid *dgid)
 398 {
 399         struct sockaddr_in  src_in;
 400         struct sockaddr_in  dst_in;
 401         __be32 src_saddr, dst_saddr;
 402
 403         if (!sgid || !dgid)
 404                 return -EINVAL;
 405
 406         if (net_type == RDMA_NETWORK_IPV4) {
 407                 memcpy(&src_in.sin_addr.s_addr,
 408                        &hdr->roce4grh.saddr, 4);
 409                 memcpy(&dst_in.sin_addr.s_addr,
 410                        &hdr->roce4grh.daddr, 4);
 411                 src_saddr = src_in.sin_addr.s_addr;
 412                 dst_saddr = dst_in.sin_addr.s_addr;
 413                 ipv6_addr_set_v4mapped(src_saddr,
 414                                        (struct in6_addr *)sgid);
 415                 ipv6_addr_set_v4mapped(dst_saddr,
 416                                        (struct in6_addr *)dgid);
 417                 return 0;
 418         } else if (net_type == RDMA_NETWORK_IPV6 ||
 419                    net_type == RDMA_NETWORK_IB) {
 420                 *dgid = hdr->ibgrh.dgid;
 421                 *sgid = hdr->ibgrh.sgid;
 422                 return 0;
 423         } else {
 424                 return -EINVAL;
 425         }
 426 }
 427
 428 int ib_init_ah_from_wc(struct ib_device *device, u8 port_num,
 429                        const struct ib_wc *wc, const struct ib_grh *grh,
 430                        struct ib_ah_attr *ah_attr)
 431 {
 432         u32 flow_class;
 433         u16 gid_index;
 434         int ret;
 435         enum rdma_network_type net_type = RDMA_NETWORK_IB;
 436         enum ib_gid_type gid_type = IB_GID_TYPE_IB;
 437         int hoplimit = 0xff;
 438         union ib_gid dgid;
 439         union ib_gid sgid;
 440
 441         memset(ah_attr, 0, sizeof *ah_attr);
 442         if (rdma_cap_eth_ah(device, port_num)) {
 443                 if (wc->wc_flags & IB_WC_WITH_NETWORK_HDR_TYPE)
 444                         net_type = wc->network_hdr_type;
 445                 else
 446                         net_type = ib_get_net_type_by_grh(device, port_num, grh);
 447                 gid_type = ib_network_to_gid_type(net_type);
 448         }
 449         ret = get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type,
 450                                      &sgid, &dgid);
 451         if (ret)
 452                 return ret;
 453
 454         if (rdma_protocol_roce(device, port_num)) {
 455                 int if_index = 0;
 456                 u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ?
 457                                 wc->vlan_id : 0xffff;
 458                 struct net_device *idev;
 459                 struct net_device *resolved_dev;
 460
 461                 if (!(wc->wc_flags & IB_WC_GRH))
 462                         return -EPROTOTYPE;
 463
 464                 if (!device->get_netdev)
 465                         return -EOPNOTSUPP;
 466
 467                 idev = device->get_netdev(device, port_num);
 468                 if (!idev)
 469                         return -ENODEV;
 470
 471                 ret = rdma_addr_find_l2_eth_by_grh(&dgid, &sgid,
 472                                                    ah_attr->dmac,
 473                                                    wc->wc_flags & IB_WC_WITH_VLAN ?
 474                                                    NULL : &vlan_id,
 475                                                    &if_index, &hoplimit);
 476                 if (ret) {
 477                         dev_put(idev);
 478                         return ret;
 479                 }
 480
 481                 resolved_dev = dev_get_by_index(&init_net, if_index);
 482                 if (resolved_dev->flags & IFF_LOOPBACK) {
 483                         dev_put(resolved_dev);
 484                         resolved_dev = idev;
 485                         dev_hold(resolved_dev);
 486                 }
 487                 rcu_read_lock();
 488                 if (resolved_dev != idev && !rdma_is_upper_dev_rcu(idev,
 489                                                                    resolved_dev))
 490                         ret = -EHOSTUNREACH;
 491                 rcu_read_unlock();
 492                 dev_put(idev);
 493                 dev_put(resolved_dev);
 494                 if (ret)
 495                         return ret;
 496
 497                 ret = get_sgid_index_from_eth(device, port_num, vlan_id,
 498                                               &dgid, gid_type, &gid_index);
 499                 if (ret)
 500                         return ret;
 501         }
 502
 503         ah_attr->dlid = wc->slid;
 504         ah_attr->sl = wc->sl;
 505         ah_attr->src_path_bits = wc->dlid_path_bits;
 506         ah_attr->port_num = port_num;
 507
 508         if (wc->wc_flags & IB_WC_GRH) {
 509                 ah_attr->ah_flags = IB_AH_GRH;
 510                 ah_attr->grh.dgid = sgid;
 511
 512                 if (!rdma_cap_eth_ah(device, port_num)) {
 513                         ret = ib_find_cached_gid_by_port(device, &dgid,
 514                                                          IB_GID_TYPE_IB,
 515                                                          port_num, NULL,
 516                                                          &gid_index);
 517                         if (ret)
 518                                 return ret;
 519                 }
 520
 521                 ah_attr->grh.sgid_index = (u8) gid_index;
 522                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 523                 ah_attr->grh.flow_label = flow_class & 0xFFFFF;
 524                 ah_attr->grh.hop_limit = hoplimit;
 525                 ah_attr->grh.traffic_class = (flow_class >> 20) & 0xFF;
 526         }
 527         return 0;
 528 }
 529 EXPORT_SYMBOL(ib_init_ah_from_wc);
 530
 531 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
 532                                    const struct ib_grh *grh, u8 port_num)
 533 {
 534         struct ib_ah_attr ah_attr;
 535         int ret;
 536
 537         ret = ib_init_ah_from_wc(pd->device, port_num, wc, grh, &ah_attr);
 538         if (ret)
 539                 return ERR_PTR(ret);
 540
 541         return ib_create_ah(pd, &ah_attr);
 542 }
 543 EXPORT_SYMBOL(ib_create_ah_from_wc);
 544
 545 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 546 {
 547         return ah->device->modify_ah ?
 548                 ah->device->modify_ah(ah, ah_attr) :
 549                 -ENOSYS;
 550 }
 551 EXPORT_SYMBOL(ib_modify_ah);
 552
 553 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 554 {
 555         return ah->device->query_ah ?
 556                 ah->device->query_ah(ah, ah_attr) :
 557                 -ENOSYS;
 558 }
 559 EXPORT_SYMBOL(ib_query_ah);
 560
 561 int ib_destroy_ah(struct ib_ah *ah)
 562 {
 563         struct ib_pd *pd;
 564         int ret;
 565
 566         pd = ah->pd;
 567         ret = ah->device->destroy_ah(ah);
 568         if (!ret)
 569                 atomic_dec(&pd->usecnt);
 570
 571         return ret;
 572 }
 573 EXPORT_SYMBOL(ib_destroy_ah);
 574
 575 /* Shared receive queues */
 576
 577 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 578                              struct ib_srq_init_attr *srq_init_attr)
 579 {
 580         struct ib_srq *srq;
 581
 582         if (!pd->device->create_srq)
 583                 return ERR_PTR(-ENOSYS);
 584
 585         srq = pd->device->create_srq(pd, srq_init_attr, NULL);
 586
 587         if (!IS_ERR(srq)) {
 588                 srq->device        = pd->device;
 589                 srq->pd            = pd;
 590                 srq->uobject       = NULL;
 591                 srq->event_handler = srq_init_attr->event_handler;
 592                 srq->srq_context   = srq_init_attr->srq_context;
 593                 srq->srq_type      = srq_init_attr->srq_type;
 594                 if (srq->srq_type == IB_SRQT_XRC) {
 595                         srq->ext.xrc.xrcd = srq_init_attr->ext.xrc.xrcd;
 596                         srq->ext.xrc.cq   = srq_init_attr->ext.xrc.cq;
 597                         atomic_inc(&srq->ext.xrc.xrcd->usecnt);
 598                         atomic_inc(&srq->ext.xrc.cq->usecnt);
 599                 }
 600                 atomic_inc(&pd->usecnt);
 601                 atomic_set(&srq->usecnt, 0);
 602         }
 603
 604         return srq;
 605 }
 606 EXPORT_SYMBOL(ib_create_srq);
 607
 608 int ib_modify_srq(struct ib_srq *srq,
 609                   struct ib_srq_attr *srq_attr,
 610                   enum ib_srq_attr_mask srq_attr_mask)
 611 {
 612         return srq->device->modify_srq ?
 613                 srq->device->modify_srq(srq, srq_attr, srq_attr_mask, NULL) :
 614                 -ENOSYS;
 615 }
 616 EXPORT_SYMBOL(ib_modify_srq);
 617
 618 int ib_query_srq(struct ib_srq *srq,
 619                  struct ib_srq_attr *srq_attr)
 620 {
 621         return srq->device->query_srq ?
 622                 srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 623 }
 624 EXPORT_SYMBOL(ib_query_srq);
 625
 626 int ib_destroy_srq(struct ib_srq *srq)
 627 {
 628         struct ib_pd *pd;
 629         enum ib_srq_type srq_type;
 630         struct ib_xrcd *uninitialized_var(xrcd);
 631         struct ib_cq *uninitialized_var(cq);
 632         int ret;
 633
 634         if (atomic_read(&srq->usecnt))
 635                 return -EBUSY;
 636
 637         pd = srq->pd;
 638         srq_type = srq->srq_type;
 639         if (srq_type == IB_SRQT_XRC) {
 640                 xrcd = srq->ext.xrc.xrcd;
 641                 cq = srq->ext.xrc.cq;
 642         }
 643
 644         ret = srq->device->destroy_srq(srq);
 645         if (!ret) {
 646                 atomic_dec(&pd->usecnt);
 647                 if (srq_type == IB_SRQT_XRC) {
 648                         atomic_dec(&xrcd->usecnt);
 649                         atomic_dec(&cq->usecnt);
 650                 }
 651         }
 652
 653         return ret;
 654 }
 655 EXPORT_SYMBOL(ib_destroy_srq);
 656
 657 /* Queue pairs */
 658
 659 static void __ib_shared_qp_event_handler(struct ib_event *event, void *context)
 660 {
 661         struct ib_qp *qp = context;
 662         unsigned long flags;
 663
 664         spin_lock_irqsave(&qp->device->event_handler_lock, flags);
 665         list_for_each_entry(event->element.qp, &qp->open_list, open_list)
 666                 if (event->element.qp->event_handler)
 667                         event->element.qp->event_handler(event, event->element.qp->qp_context);
 668         spin_unlock_irqrestore(&qp->device->event_handler_lock, flags);
 669 }
 670
 671 static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp)
 672 {
 673         mutex_lock(&xrcd->tgt_qp_mutex);
 674         list_add(&qp->xrcd_list, &xrcd->tgt_qp_list);
 675         mutex_unlock(&xrcd->tgt_qp_mutex);
 676 }
 677
 678 static struct ib_qp *__ib_open_qp(struct ib_qp *real_qp,
 679                                   void (*event_handler)(struct ib_event *, void *),
 680                                   void *qp_context)
 681 {
 682         struct ib_qp *qp;
 683         unsigned long flags;
 684
 685         qp = kzalloc(sizeof *qp, GFP_KERNEL);
 686         if (!qp)
 687                 return ERR_PTR(-ENOMEM);
 688
 689         qp->real_qp = real_qp;
 690         atomic_inc(&real_qp->usecnt);
 691         qp->device = real_qp->device;
 692         qp->event_handler = event_handler;
 693         qp->qp_context = qp_context;
 694         qp->qp_num = real_qp->qp_num;
 695         qp->qp_type = real_qp->qp_type;
 696
 697         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
 698         list_add(&qp->open_list, &real_qp->open_list);
 699         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
 700
 701         return qp;
 702 }
 703
 704 struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd,
 705                          struct ib_qp_open_attr *qp_open_attr)
 706 {
 707         struct ib_qp *qp, *real_qp;
 708
 709         if (qp_open_attr->qp_type != IB_QPT_XRC_TGT)
 710                 return ERR_PTR(-EINVAL);
 711
 712         qp = ERR_PTR(-EINVAL);
 713         mutex_lock(&xrcd->tgt_qp_mutex);
 714         list_for_each_entry(real_qp, &xrcd->tgt_qp_list, xrcd_list) {
 715                 if (real_qp->qp_num == qp_open_attr->qp_num) {
 716                         qp = __ib_open_qp(real_qp, qp_open_attr->event_handler,
 717                                           qp_open_attr->qp_context);
 718                         break;
 719                 }
 720         }
 721         mutex_unlock(&xrcd->tgt_qp_mutex);
 722         return qp;
 723 }
 724 EXPORT_SYMBOL(ib_open_qp);
 725
 726 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 727                            struct ib_qp_init_attr *qp_init_attr)
 728 {
 729         struct ib_qp *qp, *real_qp;
 730         struct ib_device *device;
 731
 732         device = pd ? pd->device : qp_init_attr->xrcd->device;
 733         qp = device->create_qp(pd, qp_init_attr, NULL);
 734
 735         if (!IS_ERR(qp)) {
 736                 qp->device     = device;
 737                 qp->real_qp    = qp;
 738                 qp->uobject    = NULL;
 739                 qp->qp_type    = qp_init_attr->qp_type;
 740
 741                 atomic_set(&qp->usecnt, 0);
 742                 if (qp_init_attr->qp_type == IB_QPT_XRC_TGT) {
 743                         qp->event_handler = __ib_shared_qp_event_handler;
 744                         qp->qp_context = qp;
 745                         qp->pd = NULL;
 746                         qp->send_cq = qp->recv_cq = NULL;
 747                         qp->srq = NULL;
 748                         qp->xrcd = qp_init_attr->xrcd;
 749                         atomic_inc(&qp_init_attr->xrcd->usecnt);
 750                         INIT_LIST_HEAD(&qp->open_list);
 751
 752                         real_qp = qp;
 753                         qp = __ib_open_qp(real_qp, qp_init_attr->event_handler,
 754                                           qp_init_attr->qp_context);
 755                         if (!IS_ERR(qp))
 756                                 __ib_insert_xrcd_qp(qp_init_attr->xrcd, real_qp);
 757                         else
 758                                 real_qp->device->destroy_qp(real_qp);
 759                 } else {
 760                         qp->event_handler = qp_init_attr->event_handler;
 761                         qp->qp_context = qp_init_attr->qp_context;
 762                         if (qp_init_attr->qp_type == IB_QPT_XRC_INI) {
 763                                 qp->recv_cq = NULL;
 764                                 qp->srq = NULL;
 765                         } else {
 766                                 qp->recv_cq = qp_init_attr->recv_cq;
 767                                 atomic_inc(&qp_init_attr->recv_cq->usecnt);
 768                                 qp->srq = qp_init_attr->srq;
 769                                 if (qp->srq)
 770                                         atomic_inc(&qp_init_attr->srq->usecnt);
 771                         }
 772
 773                         qp->pd      = pd;
 774                         qp->send_cq = qp_init_attr->send_cq;
 775                         qp->xrcd    = NULL;
 776
 777                         atomic_inc(&pd->usecnt);
 778                         atomic_inc(&qp_init_attr->send_cq->usecnt);
 779                 }
 780         }
 781
 782         return qp;
 783 }
 784 EXPORT_SYMBOL(ib_create_qp);
 785
 786 static const struct {
 787         int                     valid;
 788         enum ib_qp_attr_mask    req_param[IB_QPT_MAX];
 789         enum ib_qp_attr_mask    opt_param[IB_QPT_MAX];
 790 } qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
 791         [IB_QPS_RESET] = {
 792                 [IB_QPS_RESET] = { .valid = 1 },
 793                 [IB_QPS_INIT]  = {
 794                         .valid = 1,
 795                         .req_param = {
 796                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 797                                                 IB_QP_PORT                      |
 798                                                 IB_QP_QKEY),
 799                                 [IB_QPT_RAW_PACKET] = IB_QP_PORT,
 800                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 801                                                 IB_QP_PORT                      |
 802                                                 IB_QP_ACCESS_FLAGS),
 803                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 804                                                 IB_QP_PORT                      |
 805                                                 IB_QP_ACCESS_FLAGS),
 806                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 807                                                 IB_QP_PORT                      |
 808                                                 IB_QP_ACCESS_FLAGS),
 809                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 810                                                 IB_QP_PORT                      |
 811                                                 IB_QP_ACCESS_FLAGS),
 812                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 813                                                 IB_QP_QKEY),
 814                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 815                                                 IB_QP_QKEY),
 816                         }
 817                 },
 818         },
 819         [IB_QPS_INIT]  = {
 820                 [IB_QPS_RESET] = { .valid = 1 },
 821                 [IB_QPS_ERR] =   { .valid = 1 },
 822                 [IB_QPS_INIT]  = {
 823                         .valid = 1,
 824                         .opt_param = {
 825                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 826                                                 IB_QP_PORT                      |
 827                                                 IB_QP_QKEY),
 828                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 829                                                 IB_QP_PORT                      |
 830                                                 IB_QP_ACCESS_FLAGS),
 831                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 832                                                 IB_QP_PORT                      |
 833                                                 IB_QP_ACCESS_FLAGS),
 834                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 835                                                 IB_QP_PORT                      |
 836                                                 IB_QP_ACCESS_FLAGS),
 837                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 838                                                 IB_QP_PORT                      |
 839                                                 IB_QP_ACCESS_FLAGS),
 840                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 841                                                 IB_QP_QKEY),
 842                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 843                                                 IB_QP_QKEY),
 844                         }
 845                 },
 846                 [IB_QPS_RTR]   = {
 847                         .valid = 1,
 848                         .req_param = {
 849                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 850                                                 IB_QP_PATH_MTU                  |
 851                                                 IB_QP_DEST_QPN                  |
 852                                                 IB_QP_RQ_PSN),
 853                                 [IB_QPT_RC]  = (IB_QP_AV                        |
 854                                                 IB_QP_PATH_MTU                  |
 855                                                 IB_QP_DEST_QPN                  |
 856                                                 IB_QP_RQ_PSN                    |
 857                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 858                                                 IB_QP_MIN_RNR_TIMER),
 859                                 [IB_QPT_XRC_INI] = (IB_QP_AV                    |
 860                                                 IB_QP_PATH_MTU                  |
 861                                                 IB_QP_DEST_QPN                  |
 862                                                 IB_QP_RQ_PSN),
 863                                 [IB_QPT_XRC_TGT] = (IB_QP_AV                    |
 864                                                 IB_QP_PATH_MTU                  |
 865                                                 IB_QP_DEST_QPN                  |
 866                                                 IB_QP_RQ_PSN                    |
 867                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 868                                                 IB_QP_MIN_RNR_TIMER),
 869                         },
 870                         .opt_param = {
 871                                  [IB_QPT_UD]  = (IB_QP_PKEY_INDEX               |
 872                                                  IB_QP_QKEY),
 873                                  [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
 874                                                  IB_QP_ACCESS_FLAGS             |
 875                                                  IB_QP_PKEY_INDEX),
 876                                  [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
 877                                                  IB_QP_ACCESS_FLAGS             |
 878                                                  IB_QP_PKEY_INDEX),
 879                                  [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH             |
 880                                                  IB_QP_ACCESS_FLAGS             |
 881                                                  IB_QP_PKEY_INDEX),
 882                                  [IB_QPT_XRC_TGT] = (IB_QP_ALT_PATH             |
 883                                                  IB_QP_ACCESS_FLAGS             |
 884                                                  IB_QP_PKEY_INDEX),
 885                                  [IB_QPT_SMI] = (IB_QP_PKEY_INDEX               |
 886                                                  IB_QP_QKEY),
 887                                  [IB_QPT_GSI] = (IB_QP_PKEY_INDEX               |
 888                                                  IB_QP_QKEY),
 889                          },
 890                 },
 891         },
 892         [IB_QPS_RTR]   = {
 893                 [IB_QPS_RESET] = { .valid = 1 },
 894                 [IB_QPS_ERR] =   { .valid = 1 },
 895                 [IB_QPS_RTS]   = {
 896                         .valid = 1,
 897                         .req_param = {
 898                                 [IB_QPT_UD]  = IB_QP_SQ_PSN,
 899                                 [IB_QPT_UC]  = IB_QP_SQ_PSN,
 900                                 [IB_QPT_RC]  = (IB_QP_TIMEOUT                   |
 901                                                 IB_QP_RETRY_CNT                 |
 902                                                 IB_QP_RNR_RETRY                 |
 903                                                 IB_QP_SQ_PSN                    |
 904                                                 IB_QP_MAX_QP_RD_ATOMIC),
 905                                 [IB_QPT_XRC_INI] = (IB_QP_TIMEOUT               |
 906                                                 IB_QP_RETRY_CNT                 |
 907                                                 IB_QP_RNR_RETRY                 |
 908                                                 IB_QP_SQ_PSN                    |
 909                                                 IB_QP_MAX_QP_RD_ATOMIC),
 910                                 [IB_QPT_XRC_TGT] = (IB_QP_TIMEOUT               |
 911                                                 IB_QP_SQ_PSN),
 912                                 [IB_QPT_SMI] = IB_QP_SQ_PSN,
 913                                 [IB_QPT_GSI] = IB_QP_SQ_PSN,
 914                         },
 915                         .opt_param = {
 916                                  [IB_QPT_UD]  = (IB_QP_CUR_STATE                |
 917                                                  IB_QP_QKEY),
 918                                  [IB_QPT_UC]  = (IB_QP_CUR_STATE                |
 919                                                  IB_QP_ALT_PATH                 |
 920                                                  IB_QP_ACCESS_FLAGS             |
 921                                                  IB_QP_PATH_MIG_STATE),
 922                                  [IB_QPT_RC]  = (IB_QP_CUR_STATE                |
 923                                                  IB_QP_ALT_PATH                 |
 924                                                  IB_QP_ACCESS_FLAGS             |
 925                                                  IB_QP_MIN_RNR_TIMER            |
 926                                                  IB_QP_PATH_MIG_STATE),
 927                                  [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE            |
 928                                                  IB_QP_ALT_PATH                 |
 929                                                  IB_QP_ACCESS_FLAGS             |
 930                                                  IB_QP_PATH_MIG_STATE),
 931                                  [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE            |
 932                                                  IB_QP_ALT_PATH                 |
 933                                                  IB_QP_ACCESS_FLAGS             |
 934                                                  IB_QP_MIN_RNR_TIMER            |
 935                                                  IB_QP_PATH_MIG_STATE),
 936                                  [IB_QPT_SMI] = (IB_QP_CUR_STATE                |
 937                                                  IB_QP_QKEY),
 938                                  [IB_QPT_GSI] = (IB_QP_CUR_STATE                |
 939                                                  IB_QP_QKEY),
 940                          }
 941                 }
 942         },
 943         [IB_QPS_RTS]   = {
 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_QP_ALT_PATH                  |
 954                                                 IB_QP_PATH_MIG_STATE),
 955                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 956                                                 IB_QP_ACCESS_FLAGS              |
 957                                                 IB_QP_ALT_PATH                  |
 958                                                 IB_QP_PATH_MIG_STATE            |
 959                                                 IB_QP_MIN_RNR_TIMER),
 960                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
 961                                                 IB_QP_ACCESS_FLAGS              |
 962                                                 IB_QP_ALT_PATH                  |
 963                                                 IB_QP_PATH_MIG_STATE),
 964                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
 965                                                 IB_QP_ACCESS_FLAGS              |
 966                                                 IB_QP_ALT_PATH                  |
 967                                                 IB_QP_PATH_MIG_STATE            |
 968                                                 IB_QP_MIN_RNR_TIMER),
 969                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 970                                                 IB_QP_QKEY),
 971                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 972                                                 IB_QP_QKEY),
 973                         }
 974                 },
 975                 [IB_QPS_SQD]   = {
 976                         .valid = 1,
 977                         .opt_param = {
 978                                 [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 979                                 [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 980                                 [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 981                                 [IB_QPT_XRC_INI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 982                                 [IB_QPT_XRC_TGT] = IB_QP_EN_SQD_ASYNC_NOTIFY, /* ??? */
 983                                 [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 984                                 [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
 985                         }
 986                 },
 987         },
 988         [IB_QPS_SQD]   = {
 989                 [IB_QPS_RESET] = { .valid = 1 },
 990                 [IB_QPS_ERR] =   { .valid = 1 },
 991                 [IB_QPS_RTS]   = {
 992                         .valid = 1,
 993                         .opt_param = {
 994                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 995                                                 IB_QP_QKEY),
 996                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 997                                                 IB_QP_ALT_PATH                  |
 998                                                 IB_QP_ACCESS_FLAGS              |
 999                                                 IB_QP_PATH_MIG_STATE),
1000                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
1001                                                 IB_QP_ALT_PATH                  |
1002                                                 IB_QP_ACCESS_FLAGS              |
1003                                                 IB_QP_MIN_RNR_TIMER             |
1004                                                 IB_QP_PATH_MIG_STATE),
1005                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
1006                                                 IB_QP_ALT_PATH                  |
1007                                                 IB_QP_ACCESS_FLAGS              |
1008                                                 IB_QP_PATH_MIG_STATE),
1009                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
1010                                                 IB_QP_ALT_PATH                  |
1011                                                 IB_QP_ACCESS_FLAGS              |
1012                                                 IB_QP_MIN_RNR_TIMER             |
1013                                                 IB_QP_PATH_MIG_STATE),
1014                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
1015                                                 IB_QP_QKEY),
1016                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
1017                                                 IB_QP_QKEY),
1018                         }
1019                 },
1020                 [IB_QPS_SQD]   = {
1021                         .valid = 1,
1022                         .opt_param = {
1023                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
1024                                                 IB_QP_QKEY),
1025                                 [IB_QPT_UC]  = (IB_QP_AV                        |
1026                                                 IB_QP_ALT_PATH                  |
1027                                                 IB_QP_ACCESS_FLAGS              |
1028                                                 IB_QP_PKEY_INDEX                |
1029                                                 IB_QP_PATH_MIG_STATE),
1030                                 [IB_QPT_RC]  = (IB_QP_PORT                      |
1031                                                 IB_QP_AV                        |
1032                                                 IB_QP_TIMEOUT                   |
1033                                                 IB_QP_RETRY_CNT                 |
1034                                                 IB_QP_RNR_RETRY                 |
1035                                                 IB_QP_MAX_QP_RD_ATOMIC          |
1036                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
1037                                                 IB_QP_ALT_PATH                  |
1038                                                 IB_QP_ACCESS_FLAGS              |
1039                                                 IB_QP_PKEY_INDEX                |
1040                                                 IB_QP_MIN_RNR_TIMER             |
1041                                                 IB_QP_PATH_MIG_STATE),
1042                                 [IB_QPT_XRC_INI] = (IB_QP_PORT                  |
1043                                                 IB_QP_AV                        |
1044                                                 IB_QP_TIMEOUT                   |
1045                                                 IB_QP_RETRY_CNT                 |
1046                                                 IB_QP_RNR_RETRY                 |
1047                                                 IB_QP_MAX_QP_RD_ATOMIC          |
1048                                                 IB_QP_ALT_PATH                  |
1049                                                 IB_QP_ACCESS_FLAGS              |
1050                                                 IB_QP_PKEY_INDEX                |
1051                                                 IB_QP_PATH_MIG_STATE),
1052                                 [IB_QPT_XRC_TGT] = (IB_QP_PORT                  |
1053                                                 IB_QP_AV                        |
1054                                                 IB_QP_TIMEOUT                   |
1055                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
1056                                                 IB_QP_ALT_PATH                  |
1057                                                 IB_QP_ACCESS_FLAGS              |
1058                                                 IB_QP_PKEY_INDEX                |
1059                                                 IB_QP_MIN_RNR_TIMER             |
1060                                                 IB_QP_PATH_MIG_STATE),
1061                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
1062                                                 IB_QP_QKEY),
1063                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
1064                                                 IB_QP_QKEY),
1065                         }
1066                 }
1067         },
1068         [IB_QPS_SQE]   = {
1069                 [IB_QPS_RESET] = { .valid = 1 },
1070                 [IB_QPS_ERR] =   { .valid = 1 },
1071                 [IB_QPS_RTS]   = {
1072                         .valid = 1,
1073                         .opt_param = {
1074                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
1075                                                 IB_QP_QKEY),
1076                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
1077                                                 IB_QP_ACCESS_FLAGS),
1078                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
1079                                                 IB_QP_QKEY),
1080                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
1081                                                 IB_QP_QKEY),
1082                         }
1083                 }
1084         },
1085         [IB_QPS_ERR] = {
1086                 [IB_QPS_RESET] = { .valid = 1 },
1087                 [IB_QPS_ERR] =   { .valid = 1 }
1088         }
1089 };
1090
1091 int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
1092                        enum ib_qp_type type, enum ib_qp_attr_mask mask,
1093                        enum rdma_link_layer ll)
1094 {
1095         enum ib_qp_attr_mask req_param, opt_param;
1096
1097         if (cur_state  < 0 || cur_state  > IB_QPS_ERR ||
1098             next_state < 0 || next_state > IB_QPS_ERR)
1099                 return 0;
1100
1101         if (mask & IB_QP_CUR_STATE  &&
1102             cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
1103             cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
1104                 return 0;
1105
1106         if (!qp_state_table[cur_state][next_state].valid)
1107                 return 0;
1108
1109         req_param = qp_state_table[cur_state][next_state].req_param[type];
1110         opt_param = qp_state_table[cur_state][next_state].opt_param[type];
1111
1112         if ((mask & req_param) != req_param)
1113                 return 0;
1114
1115         if (mask & ~(req_param | opt_param | IB_QP_STATE))
1116                 return 0;
1117
1118         return 1;
1119 }
1120 EXPORT_SYMBOL(ib_modify_qp_is_ok);
1121
1122 int ib_resolve_eth_dmac(struct ib_qp *qp,
1123                         struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1124 {
1125         int           ret = 0;
1126
1127         if (*qp_attr_mask & IB_QP_AV) {
1128                 if (qp_attr->ah_attr.port_num < rdma_start_port(qp->device) ||
1129                     qp_attr->ah_attr.port_num > rdma_end_port(qp->device))
1130                         return -EINVAL;
1131
1132                 if (!rdma_cap_eth_ah(qp->device, qp_attr->ah_attr.port_num))
1133                         return 0;
1134
1135                 if (rdma_link_local_addr((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw)) {
1136                         rdma_get_ll_mac((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw,
1137                                         qp_attr->ah_attr.dmac);
1138                 } else {
1139                         union ib_gid            sgid;
1140                         struct ib_gid_attr      sgid_attr;
1141                         int                     ifindex;
1142                         int                     hop_limit;
1143
1144                         ret = ib_query_gid(qp->device,
1145                                            qp_attr->ah_attr.port_num,
1146                                            qp_attr->ah_attr.grh.sgid_index,
1147                                            &sgid, &sgid_attr);
1148
1149                         if (ret || !sgid_attr.ndev) {
1150                                 if (!ret)
1151                                         ret = -ENXIO;
1152                                 goto out;
1153                         }
1154
1155                         ifindex = sgid_attr.ndev->ifindex;
1156
1157                         ret = rdma_addr_find_l2_eth_by_grh(&sgid,
1158                                                            &qp_attr->ah_attr.grh.dgid,
1159                                                            qp_attr->ah_attr.dmac,
1160                                                            NULL, &ifindex, &hop_limit);
1161
1162                         dev_put(sgid_attr.ndev);
1163
1164                         qp_attr->ah_attr.grh.hop_limit = hop_limit;
1165                 }
1166         }
1167 out:
1168         return ret;
1169 }
1170 EXPORT_SYMBOL(ib_resolve_eth_dmac);
1171
1172
1173 int ib_modify_qp(struct ib_qp *qp,
1174                  struct ib_qp_attr *qp_attr,
1175                  int qp_attr_mask)
1176 {
1177         int ret;
1178
1179         ret = ib_resolve_eth_dmac(qp, qp_attr, &qp_attr_mask);
1180         if (ret)
1181                 return ret;
1182
1183         return qp->device->modify_qp(qp->real_qp, qp_attr, qp_attr_mask, NULL);
1184 }
1185 EXPORT_SYMBOL(ib_modify_qp);
1186
1187 int ib_query_qp(struct ib_qp *qp,
1188                 struct ib_qp_attr *qp_attr,
1189                 int qp_attr_mask,
1190                 struct ib_qp_init_attr *qp_init_attr)
1191 {
1192         return qp->device->query_qp ?
1193                 qp->device->query_qp(qp->real_qp, qp_attr, qp_attr_mask, qp_init_attr) :
1194                 -ENOSYS;
1195 }
1196 EXPORT_SYMBOL(ib_query_qp);
1197
1198 int ib_close_qp(struct ib_qp *qp)
1199 {
1200         struct ib_qp *real_qp;
1201         unsigned long flags;
1202
1203         real_qp = qp->real_qp;
1204         if (real_qp == qp)
1205                 return -EINVAL;
1206
1207         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
1208         list_del(&qp->open_list);
1209         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
1210
1211         atomic_dec(&real_qp->usecnt);
1212         kfree(qp);
1213
1214         return 0;
1215 }
1216 EXPORT_SYMBOL(ib_close_qp);
1217
1218 static int __ib_destroy_shared_qp(struct ib_qp *qp)
1219 {
1220         struct ib_xrcd *xrcd;
1221         struct ib_qp *real_qp;
1222         int ret;
1223
1224         real_qp = qp->real_qp;
1225         xrcd = real_qp->xrcd;
1226
1227         mutex_lock(&xrcd->tgt_qp_mutex);
1228         ib_close_qp(qp);
1229         if (atomic_read(&real_qp->usecnt) == 0)
1230                 list_del(&real_qp->xrcd_list);
1231         else
1232                 real_qp = NULL;
1233         mutex_unlock(&xrcd->tgt_qp_mutex);
1234
1235         if (real_qp) {
1236                 ret = ib_destroy_qp(real_qp);
1237                 if (!ret)
1238                         atomic_dec(&xrcd->usecnt);
1239                 else
1240                         __ib_insert_xrcd_qp(xrcd, real_qp);
1241         }
1242
1243         return 0;
1244 }
1245
1246 int ib_destroy_qp(struct ib_qp *qp)
1247 {
1248         struct ib_pd *pd;
1249         struct ib_cq *scq, *rcq;
1250         struct ib_srq *srq;
1251         int ret;
1252
1253         if (atomic_read(&qp->usecnt))
1254                 return -EBUSY;
1255
1256         if (qp->real_qp != qp)
1257                 return __ib_destroy_shared_qp(qp);
1258
1259         pd   = qp->pd;
1260         scq  = qp->send_cq;
1261         rcq  = qp->recv_cq;
1262         srq  = qp->srq;
1263
1264         ret = qp->device->destroy_qp(qp);
1265         if (!ret) {
1266                 if (pd)
1267                         atomic_dec(&pd->usecnt);
1268                 if (scq)
1269                         atomic_dec(&scq->usecnt);
1270                 if (rcq)
1271                         atomic_dec(&rcq->usecnt);
1272                 if (srq)
1273                         atomic_dec(&srq->usecnt);
1274         }
1275
1276         return ret;
1277 }
1278 EXPORT_SYMBOL(ib_destroy_qp);
1279
1280 /* Completion queues */
1281
1282 struct ib_cq *ib_create_cq(struct ib_device *device,
1283                            ib_comp_handler comp_handler,
1284                            void (*event_handler)(struct ib_event *, void *),
1285                            void *cq_context,
1286                            const struct ib_cq_init_attr *cq_attr)
1287 {
1288         struct ib_cq *cq;
1289
1290         cq = device->create_cq(device, cq_attr, NULL, NULL);
1291
1292         if (!IS_ERR(cq)) {
1293                 cq->device        = device;
1294                 cq->uobject       = NULL;
1295                 cq->comp_handler  = comp_handler;
1296                 cq->event_handler = event_handler;
1297                 cq->cq_context    = cq_context;
1298                 atomic_set(&cq->usecnt, 0);
1299         }
1300
1301         return cq;
1302 }
1303 EXPORT_SYMBOL(ib_create_cq);
1304
1305 int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1306 {
1307         return cq->device->modify_cq ?
1308                 cq->device->modify_cq(cq, cq_count, cq_period) : -ENOSYS;
1309 }
1310 EXPORT_SYMBOL(ib_modify_cq);
1311
1312 int ib_destroy_cq(struct ib_cq *cq)
1313 {
1314         if (atomic_read(&cq->usecnt))
1315                 return -EBUSY;
1316
1317         return cq->device->destroy_cq(cq);
1318 }
1319 EXPORT_SYMBOL(ib_destroy_cq);
1320
1321 int ib_resize_cq(struct ib_cq *cq, int cqe)
1322 {
1323         return cq->device->resize_cq ?
1324                 cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS;
1325 }
1326 EXPORT_SYMBOL(ib_resize_cq);
1327
1328 /* Memory regions */
1329
1330 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
1331 {
1332         struct ib_mr *mr;
1333         int err;
1334
1335         err = ib_check_mr_access(mr_access_flags);
1336         if (err)
1337                 return ERR_PTR(err);
1338
1339         mr = pd->device->get_dma_mr(pd, mr_access_flags);
1340
1341         if (!IS_ERR(mr)) {
1342                 mr->device  = pd->device;
1343                 mr->pd      = pd;
1344                 mr->uobject = NULL;
1345                 atomic_inc(&pd->usecnt);
1346         }
1347
1348         return mr;
1349 }
1350 EXPORT_SYMBOL(ib_get_dma_mr);
1351
1352 int ib_dereg_mr(struct ib_mr *mr)
1353 {
1354         struct ib_pd *pd = mr->pd;
1355         int ret;
1356
1357         ret = mr->device->dereg_mr(mr);
1358         if (!ret)
1359                 atomic_dec(&pd->usecnt);
1360
1361         return ret;
1362 }
1363 EXPORT_SYMBOL(ib_dereg_mr);
1364
1365 /**
1366  * ib_alloc_mr() - Allocates a memory region
1367  * @pd:            protection domain associated with the region
1368  * @mr_type:       memory region type
1369  * @max_num_sg:    maximum sg entries available for registration.
1370  *
1371  * Notes:
1372  * Memory registeration page/sg lists must not exceed max_num_sg.
1373  * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed
1374  * max_num_sg * used_page_size.
1375  *
1376  */
1377 struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
1378                           enum ib_mr_type mr_type,
1379                           u32 max_num_sg)
1380 {
1381         struct ib_mr *mr;
1382
1383         if (!pd->device->alloc_mr)
1384                 return ERR_PTR(-ENOSYS);
1385
1386         mr = pd->device->alloc_mr(pd, mr_type, max_num_sg);
1387         if (!IS_ERR(mr)) {
1388                 mr->device  = pd->device;
1389                 mr->pd      = pd;
1390                 mr->uobject = NULL;
1391                 atomic_inc(&pd->usecnt);
1392         }
1393
1394         return mr;
1395 }
1396 EXPORT_SYMBOL(ib_alloc_mr);
1397
1398 /* "Fast" memory regions */
1399
1400 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
1401                             int mr_access_flags,
1402                             struct ib_fmr_attr *fmr_attr)
1403 {
1404         struct ib_fmr *fmr;
1405
1406         if (!pd->device->alloc_fmr)
1407                 return ERR_PTR(-ENOSYS);
1408
1409         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
1410         if (!IS_ERR(fmr)) {
1411                 fmr->device = pd->device;
1412                 fmr->pd     = pd;
1413                 atomic_inc(&pd->usecnt);
1414         }
1415
1416         return fmr;
1417 }
1418 EXPORT_SYMBOL(ib_alloc_fmr);
1419
1420 int ib_unmap_fmr(struct list_head *fmr_list)
1421 {
1422         struct ib_fmr *fmr;
1423
1424         if (list_empty(fmr_list))
1425                 return 0;
1426
1427         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
1428         return fmr->device->unmap_fmr(fmr_list);
1429 }
1430 EXPORT_SYMBOL(ib_unmap_fmr);
1431
1432 int ib_dealloc_fmr(struct ib_fmr *fmr)
1433 {
1434         struct ib_pd *pd;
1435         int ret;
1436
1437         pd = fmr->pd;
1438         ret = fmr->device->dealloc_fmr(fmr);
1439         if (!ret)
1440                 atomic_dec(&pd->usecnt);
1441
1442         return ret;
1443 }
1444 EXPORT_SYMBOL(ib_dealloc_fmr);
1445
1446 /* Multicast groups */
1447
1448 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1449 {
1450         int ret;
1451
1452         if (!qp->device->attach_mcast)
1453                 return -ENOSYS;
1454         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1455                 return -EINVAL;
1456
1457         ret = qp->device->attach_mcast(qp, gid, lid);
1458         if (!ret)
1459                 atomic_inc(&qp->usecnt);
1460         return ret;
1461 }
1462 EXPORT_SYMBOL(ib_attach_mcast);
1463
1464 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1465 {
1466         int ret;
1467
1468         if (!qp->device->detach_mcast)
1469                 return -ENOSYS;
1470         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1471                 return -EINVAL;
1472
1473         ret = qp->device->detach_mcast(qp, gid, lid);
1474         if (!ret)
1475                 atomic_dec(&qp->usecnt);
1476         return ret;
1477 }
1478 EXPORT_SYMBOL(ib_detach_mcast);
1479
1480 struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device)
1481 {
1482         struct ib_xrcd *xrcd;
1483
1484         if (!device->alloc_xrcd)
1485                 return ERR_PTR(-ENOSYS);
1486
1487         xrcd = device->alloc_xrcd(device, NULL, NULL);
1488         if (!IS_ERR(xrcd)) {
1489                 xrcd->device = device;
1490                 xrcd->inode = NULL;
1491                 atomic_set(&xrcd->usecnt, 0);
1492                 mutex_init(&xrcd->tgt_qp_mutex);
1493                 INIT_LIST_HEAD(&xrcd->tgt_qp_list);
1494         }
1495
1496         return xrcd;
1497 }
1498 EXPORT_SYMBOL(ib_alloc_xrcd);
1499
1500 int ib_dealloc_xrcd(struct ib_xrcd *xrcd)
1501 {
1502         struct ib_qp *qp;
1503         int ret;
1504
1505         if (atomic_read(&xrcd->usecnt))
1506                 return -EBUSY;
1507
1508         while (!list_empty(&xrcd->tgt_qp_list)) {
1509                 qp = list_entry(xrcd->tgt_qp_list.next, struct ib_qp, xrcd_list);
1510                 ret = ib_destroy_qp(qp);
1511                 if (ret)
1512                         return ret;
1513         }
1514
1515         return xrcd->device->dealloc_xrcd(xrcd);
1516 }
1517 EXPORT_SYMBOL(ib_dealloc_xrcd);
1518
1519 struct ib_flow *ib_create_flow(struct ib_qp *qp,
1520                                struct ib_flow_attr *flow_attr,
1521                                int domain)
1522 {
1523         struct ib_flow *flow_id;
1524         if (!qp->device->create_flow)
1525                 return ERR_PTR(-ENOSYS);
1526
1527         flow_id = qp->device->create_flow(qp, flow_attr, domain);
1528         if (!IS_ERR(flow_id))
1529                 atomic_inc(&qp->usecnt);
1530         return flow_id;
1531 }
1532 EXPORT_SYMBOL(ib_create_flow);
1533
1534 int ib_destroy_flow(struct ib_flow *flow_id)
1535 {
1536         int err;
1537         struct ib_qp *qp = flow_id->qp;
1538
1539         err = qp->device->destroy_flow(flow_id);
1540         if (!err)
1541                 atomic_dec(&qp->usecnt);
1542         return err;
1543 }
1544 EXPORT_SYMBOL(ib_destroy_flow);
1545
1546 int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
1547                        struct ib_mr_status *mr_status)
1548 {
1549         return mr->device->check_mr_status ?
1550                 mr->device->check_mr_status(mr, check_mask, mr_status) : -ENOSYS;
1551 }
1552 EXPORT_SYMBOL(ib_check_mr_status);
1553
1554 int ib_set_vf_link_state(struct ib_device *device, int vf, u8 port,
1555                          int state)
1556 {
1557         if (!device->set_vf_link_state)
1558                 return -ENOSYS;
1559
1560         return device->set_vf_link_state(device, vf, port, state);
1561 }
1562 EXPORT_SYMBOL(ib_set_vf_link_state);
1563
1564 int ib_get_vf_config(struct ib_device *device, int vf, u8 port,
1565                      struct ifla_vf_info *info)
1566 {
1567         if (!device->get_vf_config)
1568                 return -ENOSYS;
1569
1570         return device->get_vf_config(device, vf, port, info);
1571 }
1572 EXPORT_SYMBOL(ib_get_vf_config);
1573
1574 int ib_get_vf_stats(struct ib_device *device, int vf, u8 port,
1575                     struct ifla_vf_stats *stats)
1576 {
1577         if (!device->get_vf_stats)
1578                 return -ENOSYS;
1579
1580         return device->get_vf_stats(device, vf, port, stats);
1581 }
1582 EXPORT_SYMBOL(ib_get_vf_stats);
1583
1584 int ib_set_vf_guid(struct ib_device *device, int vf, u8 port, u64 guid,
1585                    int type)
1586 {
1587         if (!device->set_vf_guid)
1588                 return -ENOSYS;
1589
1590         return device->set_vf_guid(device, vf, port, guid, type);
1591 }
1592 EXPORT_SYMBOL(ib_set_vf_guid);
1593
1594 /**
1595  * ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list
1596  *     and set it the memory region.
1597  * @mr:            memory region
1598  * @sg:            dma mapped scatterlist
1599  * @sg_nents:      number of entries in sg
1600  * @page_size:     page vector desired page size
1601  *
1602  * Constraints:
1603  * - The first sg element is allowed to have an offset.
1604  * - Each sg element must be aligned to page_size (or physically
1605  *   contiguous to the previous element). In case an sg element has a
1606  *   non contiguous offset, the mapping prefix will not include it.
1607  * - The last sg element is allowed to have length less than page_size.
1608  * - If sg_nents total byte length exceeds the mr max_num_sge * page_size
1609  *   then only max_num_sg entries will be mapped.
1610  * - If the MR was allocated with type IB_MR_TYPE_SG_GAPS_REG, non of these
1611  *   constraints holds and the page_size argument is ignored.
1612  *
1613  * Returns the number of sg elements that were mapped to the memory region.
1614  *
1615  * After this completes successfully, the  memory region
1616  * is ready for registration.
1617  */
1618 int ib_map_mr_sg(struct ib_mr *mr,
1619                  struct scatterlist *sg,
1620                  int sg_nents,
1621                  unsigned int page_size)
1622 {
1623         if (unlikely(!mr->device->map_mr_sg))
1624                 return -ENOSYS;
1625
1626         mr->page_size = page_size;
1627
1628         return mr->device->map_mr_sg(mr, sg, sg_nents);
1629 }
1630 EXPORT_SYMBOL(ib_map_mr_sg);
1631
1632 /**
1633  * ib_sg_to_pages() - Convert the largest prefix of a sg list
1634  *     to a page vector
1635  * @mr:            memory region
1636  * @sgl:           dma mapped scatterlist
1637  * @sg_nents:      number of entries in sg
1638  * @set_page:      driver page assignment function pointer
1639  *
1640  * Core service helper for drivers to convert the largest
1641  * prefix of given sg list to a page vector. The sg list
1642  * prefix converted is the prefix that meet the requirements
1643  * of ib_map_mr_sg.
1644  *
1645  * Returns the number of sg elements that were assigned to
1646  * a page vector.
1647  */
1648 int ib_sg_to_pages(struct ib_mr *mr,
1649                    struct scatterlist *sgl,
1650                    int sg_nents,
1651                    int (*set_page)(struct ib_mr *, u64))
1652 {
1653         struct scatterlist *sg;
1654         u64 last_end_dma_addr = 0;
1655         unsigned int last_page_off = 0;
1656         u64 page_mask = ~((u64)mr->page_size - 1);
1657         int i, ret;
1658
1659         mr->iova = sg_dma_address(&sgl[0]);
1660         mr->length = 0;
1661
1662         for_each_sg(sgl, sg, sg_nents, i) {
1663                 u64 dma_addr = sg_dma_address(sg);
1664                 unsigned int dma_len = sg_dma_len(sg);
1665                 u64 end_dma_addr = dma_addr + dma_len;
1666                 u64 page_addr = dma_addr & page_mask;
1667
1668                 /*
1669                  * For the second and later elements, check whether either the
1670                  * end of element i-1 or the start of element i is not aligned
1671                  * on a page boundary.
1672                  */
1673                 if (i && (last_page_off != 0 || page_addr != dma_addr)) {
1674                         /* Stop mapping if there is a gap. */
1675                         if (last_end_dma_addr != dma_addr)
1676                                 break;
1677
1678                         /*
1679                          * Coalesce this element with the last. If it is small
1680                          * enough just update mr->length. Otherwise start
1681                          * mapping from the next page.
1682                          */
1683                         goto next_page;
1684                 }
1685
1686                 do {
1687                         ret = set_page(mr, page_addr);
1688                         if (unlikely(ret < 0))
1689                                 return i ? : ret;
1690 next_page:
1691                         page_addr += mr->page_size;
1692                 } while (page_addr < end_dma_addr);
1693
1694                 mr->length += dma_len;
1695                 last_end_dma_addr = end_dma_addr;
1696                 last_page_off = end_dma_addr & ~page_mask;
1697         }
1698
1699         return i;
1700 }
1701 EXPORT_SYMBOL(ib_sg_to_pages);
1702
1703 struct ib_drain_cqe {
1704         struct ib_cqe cqe;
1705         struct completion done;
1706 };
1707
1708 static void ib_drain_qp_done(struct ib_cq *cq, struct ib_wc *wc)
1709 {
1710         struct ib_drain_cqe *cqe = container_of(wc->wr_cqe, struct ib_drain_cqe,
1711                                                 cqe);
1712
1713         complete(&cqe->done);
1714 }
1715
1716 /*
1717  * Post a WR and block until its completion is reaped for the SQ.
1718  */
1719 static void __ib_drain_sq(struct ib_qp *qp)
1720 {
1721         struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
1722         struct ib_drain_cqe sdrain;
1723         struct ib_send_wr swr = {}, *bad_swr;
1724         int ret;
1725
1726         if (qp->send_cq->poll_ctx == IB_POLL_DIRECT) {
1727                 WARN_ONCE(qp->send_cq->poll_ctx == IB_POLL_DIRECT,
1728                           "IB_POLL_DIRECT poll_ctx not supported for drain\n");
1729                 return;
1730         }
1731
1732         swr.wr_cqe = &sdrain.cqe;
1733         sdrain.cqe.done = ib_drain_qp_done;
1734         init_completion(&sdrain.done);
1735
1736         ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
1737         if (ret) {
1738                 WARN_ONCE(ret, "failed to drain send queue: %d\n", ret);
1739                 return;
1740         }
1741
1742         ret = ib_post_send(qp, &swr, &bad_swr);
1743         if (ret) {
1744                 WARN_ONCE(ret, "failed to drain send queue: %d\n", ret);
1745                 return;
1746         }
1747
1748         wait_for_completion(&sdrain.done);
1749 }
1750
1751 /*
1752  * Post a WR and block until its completion is reaped for the RQ.
1753  */
1754 static void __ib_drain_rq(struct ib_qp *qp)
1755 {
1756         struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
1757         struct ib_drain_cqe rdrain;
1758         struct ib_recv_wr rwr = {}, *bad_rwr;
1759         int ret;
1760
1761         if (qp->recv_cq->poll_ctx == IB_POLL_DIRECT) {
1762                 WARN_ONCE(qp->recv_cq->poll_ctx == IB_POLL_DIRECT,
1763                           "IB_POLL_DIRECT poll_ctx not supported for drain\n");
1764                 return;
1765         }
1766
1767         rwr.wr_cqe = &rdrain.cqe;
1768         rdrain.cqe.done = ib_drain_qp_done;
1769         init_completion(&rdrain.done);
1770
1771         ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
1772         if (ret) {
1773                 WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret);
1774                 return;
1775         }
1776
1777         ret = ib_post_recv(qp, &rwr, &bad_rwr);
1778         if (ret) {
1779                 WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret);
1780                 return;
1781         }
1782
1783         wait_for_completion(&rdrain.done);
1784 }
1785
1786 /**
1787  * ib_drain_sq() - Block until all SQ CQEs have been consumed by the
1788  *                 application.
1789  * @qp:            queue pair to drain
1790  *
1791  * If the device has a provider-specific drain function, then
1792  * call that.  Otherwise call the generic drain function
1793  * __ib_drain_sq().
1794  *
1795  * The caller must:
1796  *
1797  * ensure there is room in the CQ and SQ for the drain work request and
1798  * completion.
1799  *
1800  * allocate the CQ using ib_alloc_cq() and the CQ poll context cannot be
1801  * IB_POLL_DIRECT.
1802  *
1803  * ensure that there are no other contexts that are posting WRs concurrently.
1804  * Otherwise the drain is not guaranteed.
1805  */
1806 void ib_drain_sq(struct ib_qp *qp)
1807 {
1808         if (qp->device->drain_sq)
1809                 qp->device->drain_sq(qp);
1810         else
1811                 __ib_drain_sq(qp);
1812 }
1813 EXPORT_SYMBOL(ib_drain_sq);
1814
1815 /**
1816  * ib_drain_rq() - Block until all RQ CQEs have been consumed by the
1817  *                 application.
1818  * @qp:            queue pair to drain
1819  *
1820  * If the device has a provider-specific drain function, then
1821  * call that.  Otherwise call the generic drain function
1822  * __ib_drain_rq().
1823  *
1824  * The caller must:
1825  *
1826  * ensure there is room in the CQ and RQ for the drain work request and
1827  * completion.
1828  *
1829  * allocate the CQ using ib_alloc_cq() and the CQ poll context cannot be
1830  * IB_POLL_DIRECT.
1831  *
1832  * ensure that there are no other contexts that are posting WRs concurrently.
1833  * Otherwise the drain is not guaranteed.
1834  */
1835 void ib_drain_rq(struct ib_qp *qp)
1836 {
1837         if (qp->device->drain_rq)
1838                 qp->device->drain_rq(qp);
1839         else
1840                 __ib_drain_rq(qp);
1841 }
1842 EXPORT_SYMBOL(ib_drain_rq);
1843
1844 /**
1845  * ib_drain_qp() - Block until all CQEs have been consumed by the
1846  *                 application on both the RQ and SQ.
1847  * @qp:            queue pair to drain
1848  *
1849  * The caller must:
1850  *
1851  * ensure there is room in the CQ(s), SQ, and RQ for drain work requests
1852  * and completions.
1853  *
1854  * allocate the CQs using ib_alloc_cq() and the CQ poll context cannot be
1855  * IB_POLL_DIRECT.
1856  *
1857  * ensure that there are no other contexts that are posting WRs concurrently.
1858  * Otherwise the drain is not guaranteed.
1859  */
1860 void ib_drain_qp(struct ib_qp *qp)
1861 {
1862         ib_drain_sq(qp);
1863         if (!qp->srq)
1864                 ib_drain_rq(qp);
1865 }
1866 EXPORT_SYMBOL(ib_drain_qp);