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         union ib_gid dgid;
 438         union ib_gid sgid;
 439
 440         memset(ah_attr, 0, sizeof *ah_attr);
 441         if (rdma_cap_eth_ah(device, port_num)) {
 442                 if (wc->wc_flags & IB_WC_WITH_NETWORK_HDR_TYPE)
 443                         net_type = wc->network_hdr_type;
 444                 else
 445                         net_type = ib_get_net_type_by_grh(device, port_num, grh);
 446                 gid_type = ib_network_to_gid_type(net_type);
 447         }
 448         ret = get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type,
 449                                      &sgid, &dgid);
 450         if (ret)
 451                 return ret;
 452
 453         if (rdma_protocol_roce(device, port_num)) {
 454                 u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ?
 455                                 wc->vlan_id : 0xffff;
 456
 457                 if (!(wc->wc_flags & IB_WC_GRH))
 458                         return -EPROTOTYPE;
 459
 460                 if (!(wc->wc_flags & IB_WC_WITH_SMAC) ||
 461                     !(wc->wc_flags & IB_WC_WITH_VLAN)) {
 462                         ret = rdma_addr_find_dmac_by_grh(&dgid, &sgid,
 463                                                          ah_attr->dmac,
 464                                                          wc->wc_flags & IB_WC_WITH_VLAN ?
 465                                                          NULL : &vlan_id,
 466                                                          0);
 467                         if (ret)
 468                                 return ret;
 469                 }
 470
 471                 ret = get_sgid_index_from_eth(device, port_num, vlan_id,
 472                                               &dgid, gid_type, &gid_index);
 473                 if (ret)
 474                         return ret;
 475
 476                 if (wc->wc_flags & IB_WC_WITH_SMAC)
 477                         memcpy(ah_attr->dmac, wc->smac, ETH_ALEN);
 478         }
 479
 480         ah_attr->dlid = wc->slid;
 481         ah_attr->sl = wc->sl;
 482         ah_attr->src_path_bits = wc->dlid_path_bits;
 483         ah_attr->port_num = port_num;
 484
 485         if (wc->wc_flags & IB_WC_GRH) {
 486                 ah_attr->ah_flags = IB_AH_GRH;
 487                 ah_attr->grh.dgid = sgid;
 488
 489                 if (!rdma_cap_eth_ah(device, port_num)) {
 490                         ret = ib_find_cached_gid_by_port(device, &dgid,
 491                                                          IB_GID_TYPE_IB,
 492                                                          port_num, NULL,
 493                                                          &gid_index);
 494                         if (ret)
 495                                 return ret;
 496                 }
 497
 498                 ah_attr->grh.sgid_index = (u8) gid_index;
 499                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 500                 ah_attr->grh.flow_label = flow_class & 0xFFFFF;
 501                 ah_attr->grh.hop_limit = 0xFF;
 502                 ah_attr->grh.traffic_class = (flow_class >> 20) & 0xFF;
 503         }
 504         return 0;
 505 }
 506 EXPORT_SYMBOL(ib_init_ah_from_wc);
 507
 508 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
 509                                    const struct ib_grh *grh, u8 port_num)
 510 {
 511         struct ib_ah_attr ah_attr;
 512         int ret;
 513
 514         ret = ib_init_ah_from_wc(pd->device, port_num, wc, grh, &ah_attr);
 515         if (ret)
 516                 return ERR_PTR(ret);
 517
 518         return ib_create_ah(pd, &ah_attr);
 519 }
 520 EXPORT_SYMBOL(ib_create_ah_from_wc);
 521
 522 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 523 {
 524         return ah->device->modify_ah ?
 525                 ah->device->modify_ah(ah, ah_attr) :
 526                 -ENOSYS;
 527 }
 528 EXPORT_SYMBOL(ib_modify_ah);
 529
 530 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 531 {
 532         return ah->device->query_ah ?
 533                 ah->device->query_ah(ah, ah_attr) :
 534                 -ENOSYS;
 535 }
 536 EXPORT_SYMBOL(ib_query_ah);
 537
 538 int ib_destroy_ah(struct ib_ah *ah)
 539 {
 540         struct ib_pd *pd;
 541         int ret;
 542
 543         pd = ah->pd;
 544         ret = ah->device->destroy_ah(ah);
 545         if (!ret)
 546                 atomic_dec(&pd->usecnt);
 547
 548         return ret;
 549 }
 550 EXPORT_SYMBOL(ib_destroy_ah);
 551
 552 /* Shared receive queues */
 553
 554 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 555                              struct ib_srq_init_attr *srq_init_attr)
 556 {
 557         struct ib_srq *srq;
 558
 559         if (!pd->device->create_srq)
 560                 return ERR_PTR(-ENOSYS);
 561
 562         srq = pd->device->create_srq(pd, srq_init_attr, NULL);
 563
 564         if (!IS_ERR(srq)) {
 565                 srq->device        = pd->device;
 566                 srq->pd            = pd;
 567                 srq->uobject       = NULL;
 568                 srq->event_handler = srq_init_attr->event_handler;
 569                 srq->srq_context   = srq_init_attr->srq_context;
 570                 srq->srq_type      = srq_init_attr->srq_type;
 571                 if (srq->srq_type == IB_SRQT_XRC) {
 572                         srq->ext.xrc.xrcd = srq_init_attr->ext.xrc.xrcd;
 573                         srq->ext.xrc.cq   = srq_init_attr->ext.xrc.cq;
 574                         atomic_inc(&srq->ext.xrc.xrcd->usecnt);
 575                         atomic_inc(&srq->ext.xrc.cq->usecnt);
 576                 }
 577                 atomic_inc(&pd->usecnt);
 578                 atomic_set(&srq->usecnt, 0);
 579         }
 580
 581         return srq;
 582 }
 583 EXPORT_SYMBOL(ib_create_srq);
 584
 585 int ib_modify_srq(struct ib_srq *srq,
 586                   struct ib_srq_attr *srq_attr,
 587                   enum ib_srq_attr_mask srq_attr_mask)
 588 {
 589         return srq->device->modify_srq ?
 590                 srq->device->modify_srq(srq, srq_attr, srq_attr_mask, NULL) :
 591                 -ENOSYS;
 592 }
 593 EXPORT_SYMBOL(ib_modify_srq);
 594
 595 int ib_query_srq(struct ib_srq *srq,
 596                  struct ib_srq_attr *srq_attr)
 597 {
 598         return srq->device->query_srq ?
 599                 srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 600 }
 601 EXPORT_SYMBOL(ib_query_srq);
 602
 603 int ib_destroy_srq(struct ib_srq *srq)
 604 {
 605         struct ib_pd *pd;
 606         enum ib_srq_type srq_type;
 607         struct ib_xrcd *uninitialized_var(xrcd);
 608         struct ib_cq *uninitialized_var(cq);
 609         int ret;
 610
 611         if (atomic_read(&srq->usecnt))
 612                 return -EBUSY;
 613
 614         pd = srq->pd;
 615         srq_type = srq->srq_type;
 616         if (srq_type == IB_SRQT_XRC) {
 617                 xrcd = srq->ext.xrc.xrcd;
 618                 cq = srq->ext.xrc.cq;
 619         }
 620
 621         ret = srq->device->destroy_srq(srq);
 622         if (!ret) {
 623                 atomic_dec(&pd->usecnt);
 624                 if (srq_type == IB_SRQT_XRC) {
 625                         atomic_dec(&xrcd->usecnt);
 626                         atomic_dec(&cq->usecnt);
 627                 }
 628         }
 629
 630         return ret;
 631 }
 632 EXPORT_SYMBOL(ib_destroy_srq);
 633
 634 /* Queue pairs */
 635
 636 static void __ib_shared_qp_event_handler(struct ib_event *event, void *context)
 637 {
 638         struct ib_qp *qp = context;
 639         unsigned long flags;
 640
 641         spin_lock_irqsave(&qp->device->event_handler_lock, flags);
 642         list_for_each_entry(event->element.qp, &qp->open_list, open_list)
 643                 if (event->element.qp->event_handler)
 644                         event->element.qp->event_handler(event, event->element.qp->qp_context);
 645         spin_unlock_irqrestore(&qp->device->event_handler_lock, flags);
 646 }
 647
 648 static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp)
 649 {
 650         mutex_lock(&xrcd->tgt_qp_mutex);
 651         list_add(&qp->xrcd_list, &xrcd->tgt_qp_list);
 652         mutex_unlock(&xrcd->tgt_qp_mutex);
 653 }
 654
 655 static struct ib_qp *__ib_open_qp(struct ib_qp *real_qp,
 656                                   void (*event_handler)(struct ib_event *, void *),
 657                                   void *qp_context)
 658 {
 659         struct ib_qp *qp;
 660         unsigned long flags;
 661
 662         qp = kzalloc(sizeof *qp, GFP_KERNEL);
 663         if (!qp)
 664                 return ERR_PTR(-ENOMEM);
 665
 666         qp->real_qp = real_qp;
 667         atomic_inc(&real_qp->usecnt);
 668         qp->device = real_qp->device;
 669         qp->event_handler = event_handler;
 670         qp->qp_context = qp_context;
 671         qp->qp_num = real_qp->qp_num;
 672         qp->qp_type = real_qp->qp_type;
 673
 674         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
 675         list_add(&qp->open_list, &real_qp->open_list);
 676         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
 677
 678         return qp;
 679 }
 680
 681 struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd,
 682                          struct ib_qp_open_attr *qp_open_attr)
 683 {
 684         struct ib_qp *qp, *real_qp;
 685
 686         if (qp_open_attr->qp_type != IB_QPT_XRC_TGT)
 687                 return ERR_PTR(-EINVAL);
 688
 689         qp = ERR_PTR(-EINVAL);
 690         mutex_lock(&xrcd->tgt_qp_mutex);
 691         list_for_each_entry(real_qp, &xrcd->tgt_qp_list, xrcd_list) {
 692                 if (real_qp->qp_num == qp_open_attr->qp_num) {
 693                         qp = __ib_open_qp(real_qp, qp_open_attr->event_handler,
 694                                           qp_open_attr->qp_context);
 695                         break;
 696                 }
 697         }
 698         mutex_unlock(&xrcd->tgt_qp_mutex);
 699         return qp;
 700 }
 701 EXPORT_SYMBOL(ib_open_qp);
 702
 703 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 704                            struct ib_qp_init_attr *qp_init_attr)
 705 {
 706         struct ib_qp *qp, *real_qp;
 707         struct ib_device *device;
 708
 709         device = pd ? pd->device : qp_init_attr->xrcd->device;
 710         qp = device->create_qp(pd, qp_init_attr, NULL);
 711
 712         if (!IS_ERR(qp)) {
 713                 qp->device     = device;
 714                 qp->real_qp    = qp;
 715                 qp->uobject    = NULL;
 716                 qp->qp_type    = qp_init_attr->qp_type;
 717
 718                 atomic_set(&qp->usecnt, 0);
 719                 if (qp_init_attr->qp_type == IB_QPT_XRC_TGT) {
 720                         qp->event_handler = __ib_shared_qp_event_handler;
 721                         qp->qp_context = qp;
 722                         qp->pd = NULL;
 723                         qp->send_cq = qp->recv_cq = NULL;
 724                         qp->srq = NULL;
 725                         qp->xrcd = qp_init_attr->xrcd;
 726                         atomic_inc(&qp_init_attr->xrcd->usecnt);
 727                         INIT_LIST_HEAD(&qp->open_list);
 728
 729                         real_qp = qp;
 730                         qp = __ib_open_qp(real_qp, qp_init_attr->event_handler,
 731                                           qp_init_attr->qp_context);
 732                         if (!IS_ERR(qp))
 733                                 __ib_insert_xrcd_qp(qp_init_attr->xrcd, real_qp);
 734                         else
 735                                 real_qp->device->destroy_qp(real_qp);
 736                 } else {
 737                         qp->event_handler = qp_init_attr->event_handler;
 738                         qp->qp_context = qp_init_attr->qp_context;
 739                         if (qp_init_attr->qp_type == IB_QPT_XRC_INI) {
 740                                 qp->recv_cq = NULL;
 741                                 qp->srq = NULL;
 742                         } else {
 743                                 qp->recv_cq = qp_init_attr->recv_cq;
 744                                 atomic_inc(&qp_init_attr->recv_cq->usecnt);
 745                                 qp->srq = qp_init_attr->srq;
 746                                 if (qp->srq)
 747                                         atomic_inc(&qp_init_attr->srq->usecnt);
 748                         }
 749
 750                         qp->pd      = pd;
 751                         qp->send_cq = qp_init_attr->send_cq;
 752                         qp->xrcd    = NULL;
 753
 754                         atomic_inc(&pd->usecnt);
 755                         atomic_inc(&qp_init_attr->send_cq->usecnt);
 756                 }
 757         }
 758
 759         return qp;
 760 }
 761 EXPORT_SYMBOL(ib_create_qp);
 762
 763 static const struct {
 764         int                     valid;
 765         enum ib_qp_attr_mask    req_param[IB_QPT_MAX];
 766         enum ib_qp_attr_mask    opt_param[IB_QPT_MAX];
 767 } qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
 768         [IB_QPS_RESET] = {
 769                 [IB_QPS_RESET] = { .valid = 1 },
 770                 [IB_QPS_INIT]  = {
 771                         .valid = 1,
 772                         .req_param = {
 773                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 774                                                 IB_QP_PORT                      |
 775                                                 IB_QP_QKEY),
 776                                 [IB_QPT_RAW_PACKET] = IB_QP_PORT,
 777                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 778                                                 IB_QP_PORT                      |
 779                                                 IB_QP_ACCESS_FLAGS),
 780                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 781                                                 IB_QP_PORT                      |
 782                                                 IB_QP_ACCESS_FLAGS),
 783                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 784                                                 IB_QP_PORT                      |
 785                                                 IB_QP_ACCESS_FLAGS),
 786                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 787                                                 IB_QP_PORT                      |
 788                                                 IB_QP_ACCESS_FLAGS),
 789                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 790                                                 IB_QP_QKEY),
 791                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 792                                                 IB_QP_QKEY),
 793                         }
 794                 },
 795         },
 796         [IB_QPS_INIT]  = {
 797                 [IB_QPS_RESET] = { .valid = 1 },
 798                 [IB_QPS_ERR] =   { .valid = 1 },
 799                 [IB_QPS_INIT]  = {
 800                         .valid = 1,
 801                         .opt_param = {
 802                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 803                                                 IB_QP_PORT                      |
 804                                                 IB_QP_QKEY),
 805                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 806                                                 IB_QP_PORT                      |
 807                                                 IB_QP_ACCESS_FLAGS),
 808                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 809                                                 IB_QP_PORT                      |
 810                                                 IB_QP_ACCESS_FLAGS),
 811                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 812                                                 IB_QP_PORT                      |
 813                                                 IB_QP_ACCESS_FLAGS),
 814                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 815                                                 IB_QP_PORT                      |
 816                                                 IB_QP_ACCESS_FLAGS),
 817                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 818                                                 IB_QP_QKEY),
 819                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 820                                                 IB_QP_QKEY),
 821                         }
 822                 },
 823                 [IB_QPS_RTR]   = {
 824                         .valid = 1,
 825                         .req_param = {
 826                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 827                                                 IB_QP_PATH_MTU                  |
 828                                                 IB_QP_DEST_QPN                  |
 829                                                 IB_QP_RQ_PSN),
 830                                 [IB_QPT_RC]  = (IB_QP_AV                        |
 831                                                 IB_QP_PATH_MTU                  |
 832                                                 IB_QP_DEST_QPN                  |
 833                                                 IB_QP_RQ_PSN                    |
 834                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 835                                                 IB_QP_MIN_RNR_TIMER),
 836                                 [IB_QPT_XRC_INI] = (IB_QP_AV                    |
 837                                                 IB_QP_PATH_MTU                  |
 838                                                 IB_QP_DEST_QPN                  |
 839                                                 IB_QP_RQ_PSN),
 840                                 [IB_QPT_XRC_TGT] = (IB_QP_AV                    |
 841                                                 IB_QP_PATH_MTU                  |
 842                                                 IB_QP_DEST_QPN                  |
 843                                                 IB_QP_RQ_PSN                    |
 844                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 845                                                 IB_QP_MIN_RNR_TIMER),
 846                         },
 847                         .opt_param = {
 848                                  [IB_QPT_UD]  = (IB_QP_PKEY_INDEX               |
 849                                                  IB_QP_QKEY),
 850                                  [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
 851                                                  IB_QP_ACCESS_FLAGS             |
 852                                                  IB_QP_PKEY_INDEX),
 853                                  [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
 854                                                  IB_QP_ACCESS_FLAGS             |
 855                                                  IB_QP_PKEY_INDEX),
 856                                  [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH             |
 857                                                  IB_QP_ACCESS_FLAGS             |
 858                                                  IB_QP_PKEY_INDEX),
 859                                  [IB_QPT_XRC_TGT] = (IB_QP_ALT_PATH             |
 860                                                  IB_QP_ACCESS_FLAGS             |
 861                                                  IB_QP_PKEY_INDEX),
 862                                  [IB_QPT_SMI] = (IB_QP_PKEY_INDEX               |
 863                                                  IB_QP_QKEY),
 864                                  [IB_QPT_GSI] = (IB_QP_PKEY_INDEX               |
 865                                                  IB_QP_QKEY),
 866                          },
 867                 },
 868         },
 869         [IB_QPS_RTR]   = {
 870                 [IB_QPS_RESET] = { .valid = 1 },
 871                 [IB_QPS_ERR] =   { .valid = 1 },
 872                 [IB_QPS_RTS]   = {
 873                         .valid = 1,
 874                         .req_param = {
 875                                 [IB_QPT_UD]  = IB_QP_SQ_PSN,
 876                                 [IB_QPT_UC]  = IB_QP_SQ_PSN,
 877                                 [IB_QPT_RC]  = (IB_QP_TIMEOUT                   |
 878                                                 IB_QP_RETRY_CNT                 |
 879                                                 IB_QP_RNR_RETRY                 |
 880                                                 IB_QP_SQ_PSN                    |
 881                                                 IB_QP_MAX_QP_RD_ATOMIC),
 882                                 [IB_QPT_XRC_INI] = (IB_QP_TIMEOUT               |
 883                                                 IB_QP_RETRY_CNT                 |
 884                                                 IB_QP_RNR_RETRY                 |
 885                                                 IB_QP_SQ_PSN                    |
 886                                                 IB_QP_MAX_QP_RD_ATOMIC),
 887                                 [IB_QPT_XRC_TGT] = (IB_QP_TIMEOUT               |
 888                                                 IB_QP_SQ_PSN),
 889                                 [IB_QPT_SMI] = IB_QP_SQ_PSN,
 890                                 [IB_QPT_GSI] = IB_QP_SQ_PSN,
 891                         },
 892                         .opt_param = {
 893                                  [IB_QPT_UD]  = (IB_QP_CUR_STATE                |
 894                                                  IB_QP_QKEY),
 895                                  [IB_QPT_UC]  = (IB_QP_CUR_STATE                |
 896                                                  IB_QP_ALT_PATH                 |
 897                                                  IB_QP_ACCESS_FLAGS             |
 898                                                  IB_QP_PATH_MIG_STATE),
 899                                  [IB_QPT_RC]  = (IB_QP_CUR_STATE                |
 900                                                  IB_QP_ALT_PATH                 |
 901                                                  IB_QP_ACCESS_FLAGS             |
 902                                                  IB_QP_MIN_RNR_TIMER            |
 903                                                  IB_QP_PATH_MIG_STATE),
 904                                  [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE            |
 905                                                  IB_QP_ALT_PATH                 |
 906                                                  IB_QP_ACCESS_FLAGS             |
 907                                                  IB_QP_PATH_MIG_STATE),
 908                                  [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE            |
 909                                                  IB_QP_ALT_PATH                 |
 910                                                  IB_QP_ACCESS_FLAGS             |
 911                                                  IB_QP_MIN_RNR_TIMER            |
 912                                                  IB_QP_PATH_MIG_STATE),
 913                                  [IB_QPT_SMI] = (IB_QP_CUR_STATE                |
 914                                                  IB_QP_QKEY),
 915                                  [IB_QPT_GSI] = (IB_QP_CUR_STATE                |
 916                                                  IB_QP_QKEY),
 917                          }
 918                 }
 919         },
 920         [IB_QPS_RTS]   = {
 921                 [IB_QPS_RESET] = { .valid = 1 },
 922                 [IB_QPS_ERR] =   { .valid = 1 },
 923                 [IB_QPS_RTS]   = {
 924                         .valid = 1,
 925                         .opt_param = {
 926                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 927                                                 IB_QP_QKEY),
 928                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 929                                                 IB_QP_ACCESS_FLAGS              |
 930                                                 IB_QP_ALT_PATH                  |
 931                                                 IB_QP_PATH_MIG_STATE),
 932                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 933                                                 IB_QP_ACCESS_FLAGS              |
 934                                                 IB_QP_ALT_PATH                  |
 935                                                 IB_QP_PATH_MIG_STATE            |
 936                                                 IB_QP_MIN_RNR_TIMER),
 937                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
 938                                                 IB_QP_ACCESS_FLAGS              |
 939                                                 IB_QP_ALT_PATH                  |
 940                                                 IB_QP_PATH_MIG_STATE),
 941                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
 942                                                 IB_QP_ACCESS_FLAGS              |
 943                                                 IB_QP_ALT_PATH                  |
 944                                                 IB_QP_PATH_MIG_STATE            |
 945                                                 IB_QP_MIN_RNR_TIMER),
 946                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 947                                                 IB_QP_QKEY),
 948                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 949                                                 IB_QP_QKEY),
 950                         }
 951                 },
 952                 [IB_QPS_SQD]   = {
 953                         .valid = 1,
 954                         .opt_param = {
 955                                 [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 956                                 [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 957                                 [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
 958                                 [IB_QPT_XRC_INI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 959                                 [IB_QPT_XRC_TGT] = IB_QP_EN_SQD_ASYNC_NOTIFY, /* ??? */
 960                                 [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
 961                                 [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
 962                         }
 963                 },
 964         },
 965         [IB_QPS_SQD]   = {
 966                 [IB_QPS_RESET] = { .valid = 1 },
 967                 [IB_QPS_ERR] =   { .valid = 1 },
 968                 [IB_QPS_RTS]   = {
 969                         .valid = 1,
 970                         .opt_param = {
 971                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
 972                                                 IB_QP_QKEY),
 973                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
 974                                                 IB_QP_ALT_PATH                  |
 975                                                 IB_QP_ACCESS_FLAGS              |
 976                                                 IB_QP_PATH_MIG_STATE),
 977                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
 978                                                 IB_QP_ALT_PATH                  |
 979                                                 IB_QP_ACCESS_FLAGS              |
 980                                                 IB_QP_MIN_RNR_TIMER             |
 981                                                 IB_QP_PATH_MIG_STATE),
 982                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
 983                                                 IB_QP_ALT_PATH                  |
 984                                                 IB_QP_ACCESS_FLAGS              |
 985                                                 IB_QP_PATH_MIG_STATE),
 986                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
 987                                                 IB_QP_ALT_PATH                  |
 988                                                 IB_QP_ACCESS_FLAGS              |
 989                                                 IB_QP_MIN_RNR_TIMER             |
 990                                                 IB_QP_PATH_MIG_STATE),
 991                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
 992                                                 IB_QP_QKEY),
 993                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
 994                                                 IB_QP_QKEY),
 995                         }
 996                 },
 997                 [IB_QPS_SQD]   = {
 998                         .valid = 1,
 999                         .opt_param = {
1000                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
1001                                                 IB_QP_QKEY),
1002                                 [IB_QPT_UC]  = (IB_QP_AV                        |
1003                                                 IB_QP_ALT_PATH                  |
1004                                                 IB_QP_ACCESS_FLAGS              |
1005                                                 IB_QP_PKEY_INDEX                |
1006                                                 IB_QP_PATH_MIG_STATE),
1007                                 [IB_QPT_RC]  = (IB_QP_PORT                      |
1008                                                 IB_QP_AV                        |
1009                                                 IB_QP_TIMEOUT                   |
1010                                                 IB_QP_RETRY_CNT                 |
1011                                                 IB_QP_RNR_RETRY                 |
1012                                                 IB_QP_MAX_QP_RD_ATOMIC          |
1013                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
1014                                                 IB_QP_ALT_PATH                  |
1015                                                 IB_QP_ACCESS_FLAGS              |
1016                                                 IB_QP_PKEY_INDEX                |
1017                                                 IB_QP_MIN_RNR_TIMER             |
1018                                                 IB_QP_PATH_MIG_STATE),
1019                                 [IB_QPT_XRC_INI] = (IB_QP_PORT                  |
1020                                                 IB_QP_AV                        |
1021                                                 IB_QP_TIMEOUT                   |
1022                                                 IB_QP_RETRY_CNT                 |
1023                                                 IB_QP_RNR_RETRY                 |
1024                                                 IB_QP_MAX_QP_RD_ATOMIC          |
1025                                                 IB_QP_ALT_PATH                  |
1026                                                 IB_QP_ACCESS_FLAGS              |
1027                                                 IB_QP_PKEY_INDEX                |
1028                                                 IB_QP_PATH_MIG_STATE),
1029                                 [IB_QPT_XRC_TGT] = (IB_QP_PORT                  |
1030                                                 IB_QP_AV                        |
1031                                                 IB_QP_TIMEOUT                   |
1032                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
1033                                                 IB_QP_ALT_PATH                  |
1034                                                 IB_QP_ACCESS_FLAGS              |
1035                                                 IB_QP_PKEY_INDEX                |
1036                                                 IB_QP_MIN_RNR_TIMER             |
1037                                                 IB_QP_PATH_MIG_STATE),
1038                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
1039                                                 IB_QP_QKEY),
1040                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
1041                                                 IB_QP_QKEY),
1042                         }
1043                 }
1044         },
1045         [IB_QPS_SQE]   = {
1046                 [IB_QPS_RESET] = { .valid = 1 },
1047                 [IB_QPS_ERR] =   { .valid = 1 },
1048                 [IB_QPS_RTS]   = {
1049                         .valid = 1,
1050                         .opt_param = {
1051                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
1052                                                 IB_QP_QKEY),
1053                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
1054                                                 IB_QP_ACCESS_FLAGS),
1055                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
1056                                                 IB_QP_QKEY),
1057                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
1058                                                 IB_QP_QKEY),
1059                         }
1060                 }
1061         },
1062         [IB_QPS_ERR] = {
1063                 [IB_QPS_RESET] = { .valid = 1 },
1064                 [IB_QPS_ERR] =   { .valid = 1 }
1065         }
1066 };
1067
1068 int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
1069                        enum ib_qp_type type, enum ib_qp_attr_mask mask,
1070                        enum rdma_link_layer ll)
1071 {
1072         enum ib_qp_attr_mask req_param, opt_param;
1073
1074         if (cur_state  < 0 || cur_state  > IB_QPS_ERR ||
1075             next_state < 0 || next_state > IB_QPS_ERR)
1076                 return 0;
1077
1078         if (mask & IB_QP_CUR_STATE  &&
1079             cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
1080             cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
1081                 return 0;
1082
1083         if (!qp_state_table[cur_state][next_state].valid)
1084                 return 0;
1085
1086         req_param = qp_state_table[cur_state][next_state].req_param[type];
1087         opt_param = qp_state_table[cur_state][next_state].opt_param[type];
1088
1089         if ((mask & req_param) != req_param)
1090                 return 0;
1091
1092         if (mask & ~(req_param | opt_param | IB_QP_STATE))
1093                 return 0;
1094
1095         return 1;
1096 }
1097 EXPORT_SYMBOL(ib_modify_qp_is_ok);
1098
1099 int ib_resolve_eth_dmac(struct ib_qp *qp,
1100                         struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1101 {
1102         int           ret = 0;
1103
1104         if (*qp_attr_mask & IB_QP_AV) {
1105                 if (qp_attr->ah_attr.port_num < rdma_start_port(qp->device) ||
1106                     qp_attr->ah_attr.port_num > rdma_end_port(qp->device))
1107                         return -EINVAL;
1108
1109                 if (!rdma_cap_eth_ah(qp->device, qp_attr->ah_attr.port_num))
1110                         return 0;
1111
1112                 if (rdma_link_local_addr((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw)) {
1113                         rdma_get_ll_mac((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw,
1114                                         qp_attr->ah_attr.dmac);
1115                 } else {
1116                         union ib_gid            sgid;
1117                         struct ib_gid_attr      sgid_attr;
1118                         int                     ifindex;
1119
1120                         ret = ib_query_gid(qp->device,
1121                                            qp_attr->ah_attr.port_num,
1122                                            qp_attr->ah_attr.grh.sgid_index,
1123                                            &sgid, &sgid_attr);
1124
1125                         if (ret || !sgid_attr.ndev) {
1126                                 if (!ret)
1127                                         ret = -ENXIO;
1128                                 goto out;
1129                         }
1130                         if (sgid_attr.gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
1131                                 /* TODO: get the hoplimit from the inet/inet6
1132                                  * device
1133                                  */
1134                                 qp_attr->ah_attr.grh.hop_limit =
1135                                                         IPV6_DEFAULT_HOPLIMIT;
1136
1137                         ifindex = sgid_attr.ndev->ifindex;
1138
1139                         ret = rdma_addr_find_dmac_by_grh(&sgid,
1140                                                          &qp_attr->ah_attr.grh.dgid,
1141                                                          qp_attr->ah_attr.dmac,
1142                                                          NULL, ifindex);
1143
1144                         dev_put(sgid_attr.ndev);
1145                 }
1146         }
1147 out:
1148         return ret;
1149 }
1150 EXPORT_SYMBOL(ib_resolve_eth_dmac);
1151
1152
1153 int ib_modify_qp(struct ib_qp *qp,
1154                  struct ib_qp_attr *qp_attr,
1155                  int qp_attr_mask)
1156 {
1157         int ret;
1158
1159         ret = ib_resolve_eth_dmac(qp, qp_attr, &qp_attr_mask);
1160         if (ret)
1161                 return ret;
1162
1163         return qp->device->modify_qp(qp->real_qp, qp_attr, qp_attr_mask, NULL);
1164 }
1165 EXPORT_SYMBOL(ib_modify_qp);
1166
1167 int ib_query_qp(struct ib_qp *qp,
1168                 struct ib_qp_attr *qp_attr,
1169                 int qp_attr_mask,
1170                 struct ib_qp_init_attr *qp_init_attr)
1171 {
1172         return qp->device->query_qp ?
1173                 qp->device->query_qp(qp->real_qp, qp_attr, qp_attr_mask, qp_init_attr) :
1174                 -ENOSYS;
1175 }
1176 EXPORT_SYMBOL(ib_query_qp);
1177
1178 int ib_close_qp(struct ib_qp *qp)
1179 {
1180         struct ib_qp *real_qp;
1181         unsigned long flags;
1182
1183         real_qp = qp->real_qp;
1184         if (real_qp == qp)
1185                 return -EINVAL;
1186
1187         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
1188         list_del(&qp->open_list);
1189         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
1190
1191         atomic_dec(&real_qp->usecnt);
1192         kfree(qp);
1193
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(ib_close_qp);
1197
1198 static int __ib_destroy_shared_qp(struct ib_qp *qp)
1199 {
1200         struct ib_xrcd *xrcd;
1201         struct ib_qp *real_qp;
1202         int ret;
1203
1204         real_qp = qp->real_qp;
1205         xrcd = real_qp->xrcd;
1206
1207         mutex_lock(&xrcd->tgt_qp_mutex);
1208         ib_close_qp(qp);
1209         if (atomic_read(&real_qp->usecnt) == 0)
1210                 list_del(&real_qp->xrcd_list);
1211         else
1212                 real_qp = NULL;
1213         mutex_unlock(&xrcd->tgt_qp_mutex);
1214
1215         if (real_qp) {
1216                 ret = ib_destroy_qp(real_qp);
1217                 if (!ret)
1218                         atomic_dec(&xrcd->usecnt);
1219                 else
1220                         __ib_insert_xrcd_qp(xrcd, real_qp);
1221         }
1222
1223         return 0;
1224 }
1225
1226 int ib_destroy_qp(struct ib_qp *qp)
1227 {
1228         struct ib_pd *pd;
1229         struct ib_cq *scq, *rcq;
1230         struct ib_srq *srq;
1231         int ret;
1232
1233         if (atomic_read(&qp->usecnt))
1234                 return -EBUSY;
1235
1236         if (qp->real_qp != qp)
1237                 return __ib_destroy_shared_qp(qp);
1238
1239         pd   = qp->pd;
1240         scq  = qp->send_cq;
1241         rcq  = qp->recv_cq;
1242         srq  = qp->srq;
1243
1244         ret = qp->device->destroy_qp(qp);
1245         if (!ret) {
1246                 if (pd)
1247                         atomic_dec(&pd->usecnt);
1248                 if (scq)
1249                         atomic_dec(&scq->usecnt);
1250                 if (rcq)
1251                         atomic_dec(&rcq->usecnt);
1252                 if (srq)
1253                         atomic_dec(&srq->usecnt);
1254         }
1255
1256         return ret;
1257 }
1258 EXPORT_SYMBOL(ib_destroy_qp);
1259
1260 /* Completion queues */
1261
1262 struct ib_cq *ib_create_cq(struct ib_device *device,
1263                            ib_comp_handler comp_handler,
1264                            void (*event_handler)(struct ib_event *, void *),
1265                            void *cq_context,
1266                            const struct ib_cq_init_attr *cq_attr)
1267 {
1268         struct ib_cq *cq;
1269
1270         cq = device->create_cq(device, cq_attr, NULL, NULL);
1271
1272         if (!IS_ERR(cq)) {
1273                 cq->device        = device;
1274                 cq->uobject       = NULL;
1275                 cq->comp_handler  = comp_handler;
1276                 cq->event_handler = event_handler;
1277                 cq->cq_context    = cq_context;
1278                 atomic_set(&cq->usecnt, 0);
1279         }
1280
1281         return cq;
1282 }
1283 EXPORT_SYMBOL(ib_create_cq);
1284
1285 int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1286 {
1287         return cq->device->modify_cq ?
1288                 cq->device->modify_cq(cq, cq_count, cq_period) : -ENOSYS;
1289 }
1290 EXPORT_SYMBOL(ib_modify_cq);
1291
1292 int ib_destroy_cq(struct ib_cq *cq)
1293 {
1294         if (atomic_read(&cq->usecnt))
1295                 return -EBUSY;
1296
1297         return cq->device->destroy_cq(cq);
1298 }
1299 EXPORT_SYMBOL(ib_destroy_cq);
1300
1301 int ib_resize_cq(struct ib_cq *cq, int cqe)
1302 {
1303         return cq->device->resize_cq ?
1304                 cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS;
1305 }
1306 EXPORT_SYMBOL(ib_resize_cq);
1307
1308 /* Memory regions */
1309
1310 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
1311 {
1312         struct ib_mr *mr;
1313         int err;
1314
1315         err = ib_check_mr_access(mr_access_flags);
1316         if (err)
1317                 return ERR_PTR(err);
1318
1319         mr = pd->device->get_dma_mr(pd, mr_access_flags);
1320
1321         if (!IS_ERR(mr)) {
1322                 mr->device  = pd->device;
1323                 mr->pd      = pd;
1324                 mr->uobject = NULL;
1325                 atomic_inc(&pd->usecnt);
1326                 atomic_set(&mr->usecnt, 0);
1327         }
1328
1329         return mr;
1330 }
1331 EXPORT_SYMBOL(ib_get_dma_mr);
1332
1333 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
1334 {
1335         return mr->device->query_mr ?
1336                 mr->device->query_mr(mr, mr_attr) : -ENOSYS;
1337 }
1338 EXPORT_SYMBOL(ib_query_mr);
1339
1340 int ib_dereg_mr(struct ib_mr *mr)
1341 {
1342         struct ib_pd *pd;
1343         int ret;
1344
1345         if (atomic_read(&mr->usecnt))
1346                 return -EBUSY;
1347
1348         pd = mr->pd;
1349         ret = mr->device->dereg_mr(mr);
1350         if (!ret)
1351                 atomic_dec(&pd->usecnt);
1352
1353         return ret;
1354 }
1355 EXPORT_SYMBOL(ib_dereg_mr);
1356
1357 /**
1358  * ib_alloc_mr() - Allocates a memory region
1359  * @pd:            protection domain associated with the region
1360  * @mr_type:       memory region type
1361  * @max_num_sg:    maximum sg entries available for registration.
1362  *
1363  * Notes:
1364  * Memory registeration page/sg lists must not exceed max_num_sg.
1365  * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed
1366  * max_num_sg * used_page_size.
1367  *
1368  */
1369 struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
1370                           enum ib_mr_type mr_type,
1371                           u32 max_num_sg)
1372 {
1373         struct ib_mr *mr;
1374
1375         if (!pd->device->alloc_mr)
1376                 return ERR_PTR(-ENOSYS);
1377
1378         mr = pd->device->alloc_mr(pd, mr_type, max_num_sg);
1379         if (!IS_ERR(mr)) {
1380                 mr->device  = pd->device;
1381                 mr->pd      = pd;
1382                 mr->uobject = NULL;
1383                 atomic_inc(&pd->usecnt);
1384                 atomic_set(&mr->usecnt, 0);
1385         }
1386
1387         return mr;
1388 }
1389 EXPORT_SYMBOL(ib_alloc_mr);
1390
1391 /* Memory windows */
1392
1393 struct ib_mw *ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type)
1394 {
1395         struct ib_mw *mw;
1396
1397         if (!pd->device->alloc_mw)
1398                 return ERR_PTR(-ENOSYS);
1399
1400         mw = pd->device->alloc_mw(pd, type);
1401         if (!IS_ERR(mw)) {
1402                 mw->device  = pd->device;
1403                 mw->pd      = pd;
1404                 mw->uobject = NULL;
1405                 mw->type    = type;
1406                 atomic_inc(&pd->usecnt);
1407         }
1408
1409         return mw;
1410 }
1411 EXPORT_SYMBOL(ib_alloc_mw);
1412
1413 int ib_dealloc_mw(struct ib_mw *mw)
1414 {
1415         struct ib_pd *pd;
1416         int ret;
1417
1418         pd = mw->pd;
1419         ret = mw->device->dealloc_mw(mw);
1420         if (!ret)
1421                 atomic_dec(&pd->usecnt);
1422
1423         return ret;
1424 }
1425 EXPORT_SYMBOL(ib_dealloc_mw);
1426
1427 /* "Fast" memory regions */
1428
1429 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
1430                             int mr_access_flags,
1431                             struct ib_fmr_attr *fmr_attr)
1432 {
1433         struct ib_fmr *fmr;
1434
1435         if (!pd->device->alloc_fmr)
1436                 return ERR_PTR(-ENOSYS);
1437
1438         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
1439         if (!IS_ERR(fmr)) {
1440                 fmr->device = pd->device;
1441                 fmr->pd     = pd;
1442                 atomic_inc(&pd->usecnt);
1443         }
1444
1445         return fmr;
1446 }
1447 EXPORT_SYMBOL(ib_alloc_fmr);
1448
1449 int ib_unmap_fmr(struct list_head *fmr_list)
1450 {
1451         struct ib_fmr *fmr;
1452
1453         if (list_empty(fmr_list))
1454                 return 0;
1455
1456         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
1457         return fmr->device->unmap_fmr(fmr_list);
1458 }
1459 EXPORT_SYMBOL(ib_unmap_fmr);
1460
1461 int ib_dealloc_fmr(struct ib_fmr *fmr)
1462 {
1463         struct ib_pd *pd;
1464         int ret;
1465
1466         pd = fmr->pd;
1467         ret = fmr->device->dealloc_fmr(fmr);
1468         if (!ret)
1469                 atomic_dec(&pd->usecnt);
1470
1471         return ret;
1472 }
1473 EXPORT_SYMBOL(ib_dealloc_fmr);
1474
1475 /* Multicast groups */
1476
1477 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1478 {
1479         int ret;
1480
1481         if (!qp->device->attach_mcast)
1482                 return -ENOSYS;
1483         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1484                 return -EINVAL;
1485
1486         ret = qp->device->attach_mcast(qp, gid, lid);
1487         if (!ret)
1488                 atomic_inc(&qp->usecnt);
1489         return ret;
1490 }
1491 EXPORT_SYMBOL(ib_attach_mcast);
1492
1493 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1494 {
1495         int ret;
1496
1497         if (!qp->device->detach_mcast)
1498                 return -ENOSYS;
1499         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1500                 return -EINVAL;
1501
1502         ret = qp->device->detach_mcast(qp, gid, lid);
1503         if (!ret)
1504                 atomic_dec(&qp->usecnt);
1505         return ret;
1506 }
1507 EXPORT_SYMBOL(ib_detach_mcast);
1508
1509 struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device)
1510 {
1511         struct ib_xrcd *xrcd;
1512
1513         if (!device->alloc_xrcd)
1514                 return ERR_PTR(-ENOSYS);
1515
1516         xrcd = device->alloc_xrcd(device, NULL, NULL);
1517         if (!IS_ERR(xrcd)) {
1518                 xrcd->device = device;
1519                 xrcd->inode = NULL;
1520                 atomic_set(&xrcd->usecnt, 0);
1521                 mutex_init(&xrcd->tgt_qp_mutex);
1522                 INIT_LIST_HEAD(&xrcd->tgt_qp_list);
1523         }
1524
1525         return xrcd;
1526 }
1527 EXPORT_SYMBOL(ib_alloc_xrcd);
1528
1529 int ib_dealloc_xrcd(struct ib_xrcd *xrcd)
1530 {
1531         struct ib_qp *qp;
1532         int ret;
1533
1534         if (atomic_read(&xrcd->usecnt))
1535                 return -EBUSY;
1536
1537         while (!list_empty(&xrcd->tgt_qp_list)) {
1538                 qp = list_entry(xrcd->tgt_qp_list.next, struct ib_qp, xrcd_list);
1539                 ret = ib_destroy_qp(qp);
1540                 if (ret)
1541                         return ret;
1542         }
1543
1544         return xrcd->device->dealloc_xrcd(xrcd);
1545 }
1546 EXPORT_SYMBOL(ib_dealloc_xrcd);
1547
1548 struct ib_flow *ib_create_flow(struct ib_qp *qp,
1549                                struct ib_flow_attr *flow_attr,
1550                                int domain)
1551 {
1552         struct ib_flow *flow_id;
1553         if (!qp->device->create_flow)
1554                 return ERR_PTR(-ENOSYS);
1555
1556         flow_id = qp->device->create_flow(qp, flow_attr, domain);
1557         if (!IS_ERR(flow_id))
1558                 atomic_inc(&qp->usecnt);
1559         return flow_id;
1560 }
1561 EXPORT_SYMBOL(ib_create_flow);
1562
1563 int ib_destroy_flow(struct ib_flow *flow_id)
1564 {
1565         int err;
1566         struct ib_qp *qp = flow_id->qp;
1567
1568         err = qp->device->destroy_flow(flow_id);
1569         if (!err)
1570                 atomic_dec(&qp->usecnt);
1571         return err;
1572 }
1573 EXPORT_SYMBOL(ib_destroy_flow);
1574
1575 int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
1576                        struct ib_mr_status *mr_status)
1577 {
1578         return mr->device->check_mr_status ?
1579                 mr->device->check_mr_status(mr, check_mask, mr_status) : -ENOSYS;
1580 }
1581 EXPORT_SYMBOL(ib_check_mr_status);
1582
1583 /**
1584  * ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list
1585  *     and set it the memory region.
1586  * @mr:            memory region
1587  * @sg:            dma mapped scatterlist
1588  * @sg_nents:      number of entries in sg
1589  * @page_size:     page vector desired page size
1590  *
1591  * Constraints:
1592  * - The first sg element is allowed to have an offset.
1593  * - Each sg element must be aligned to page_size (or physically
1594  *   contiguous to the previous element). In case an sg element has a
1595  *   non contiguous offset, the mapping prefix will not include it.
1596  * - The last sg element is allowed to have length less than page_size.
1597  * - If sg_nents total byte length exceeds the mr max_num_sge * page_size
1598  *   then only max_num_sg entries will be mapped.
1599  *
1600  * Returns the number of sg elements that were mapped to the memory region.
1601  *
1602  * After this completes successfully, the  memory region
1603  * is ready for registration.
1604  */
1605 int ib_map_mr_sg(struct ib_mr *mr,
1606                  struct scatterlist *sg,
1607                  int sg_nents,
1608                  unsigned int page_size)
1609 {
1610         if (unlikely(!mr->device->map_mr_sg))
1611                 return -ENOSYS;
1612
1613         mr->page_size = page_size;
1614
1615         return mr->device->map_mr_sg(mr, sg, sg_nents);
1616 }
1617 EXPORT_SYMBOL(ib_map_mr_sg);
1618
1619 /**
1620  * ib_sg_to_pages() - Convert the largest prefix of a sg list
1621  *     to a page vector
1622  * @mr:            memory region
1623  * @sgl:           dma mapped scatterlist
1624  * @sg_nents:      number of entries in sg
1625  * @set_page:      driver page assignment function pointer
1626  *
1627  * Core service helper for drivers to convert the largest
1628  * prefix of given sg list to a page vector. The sg list
1629  * prefix converted is the prefix that meet the requirements
1630  * of ib_map_mr_sg.
1631  *
1632  * Returns the number of sg elements that were assigned to
1633  * a page vector.
1634  */
1635 int ib_sg_to_pages(struct ib_mr *mr,
1636                    struct scatterlist *sgl,
1637                    int sg_nents,
1638                    int (*set_page)(struct ib_mr *, u64))
1639 {
1640         struct scatterlist *sg;
1641         u64 last_end_dma_addr = 0, last_page_addr = 0;
1642         unsigned int last_page_off = 0;
1643         u64 page_mask = ~((u64)mr->page_size - 1);
1644         int i, ret;
1645
1646         mr->iova = sg_dma_address(&sgl[0]);
1647         mr->length = 0;
1648
1649         for_each_sg(sgl, sg, sg_nents, i) {
1650                 u64 dma_addr = sg_dma_address(sg);
1651                 unsigned int dma_len = sg_dma_len(sg);
1652                 u64 end_dma_addr = dma_addr + dma_len;
1653                 u64 page_addr = dma_addr & page_mask;
1654
1655                 /*
1656                  * For the second and later elements, check whether either the
1657                  * end of element i-1 or the start of element i is not aligned
1658                  * on a page boundary.
1659                  */
1660                 if (i && (last_page_off != 0 || page_addr != dma_addr)) {
1661                         /* Stop mapping if there is a gap. */
1662                         if (last_end_dma_addr != dma_addr)
1663                                 break;
1664
1665                         /*
1666                          * Coalesce this element with the last. If it is small
1667                          * enough just update mr->length. Otherwise start
1668                          * mapping from the next page.
1669                          */
1670                         goto next_page;
1671                 }
1672
1673                 do {
1674                         ret = set_page(mr, page_addr);
1675                         if (unlikely(ret < 0))
1676                                 return i ? : ret;
1677 next_page:
1678                         page_addr += mr->page_size;
1679                 } while (page_addr < end_dma_addr);
1680
1681                 mr->length += dma_len;
1682                 last_end_dma_addr = end_dma_addr;
1683                 last_page_addr = end_dma_addr & page_mask;
1684                 last_page_off = end_dma_addr & ~page_mask;
1685         }
1686
1687         return i;
1688 }
1689 EXPORT_SYMBOL(ib_sg_to_pages);