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 #include <rdma/rw.h>
  52
  53 #include "core_priv.h"
  54
  55 static const char * const ib_events[] = {
  56         [IB_EVENT_CQ_ERR]               = "CQ error",
  57         [IB_EVENT_QP_FATAL]             = "QP fatal error",
  58         [IB_EVENT_QP_REQ_ERR]           = "QP request error",
  59         [IB_EVENT_QP_ACCESS_ERR]        = "QP access error",
  60         [IB_EVENT_COMM_EST]             = "communication established",
  61         [IB_EVENT_SQ_DRAINED]           = "send queue drained",
  62         [IB_EVENT_PATH_MIG]             = "path migration successful",
  63         [IB_EVENT_PATH_MIG_ERR]         = "path migration error",
  64         [IB_EVENT_DEVICE_FATAL]         = "device fatal error",
  65         [IB_EVENT_PORT_ACTIVE]          = "port active",
  66         [IB_EVENT_PORT_ERR]             = "port error",
  67         [IB_EVENT_LID_CHANGE]           = "LID change",
  68         [IB_EVENT_PKEY_CHANGE]          = "P_key change",
  69         [IB_EVENT_SM_CHANGE]            = "SM change",
  70         [IB_EVENT_SRQ_ERR]              = "SRQ error",
  71         [IB_EVENT_SRQ_LIMIT_REACHED]    = "SRQ limit reached",
  72         [IB_EVENT_QP_LAST_WQE_REACHED]  = "last WQE reached",
  73         [IB_EVENT_CLIENT_REREGISTER]    = "client reregister",
  74         [IB_EVENT_GID_CHANGE]           = "GID changed",
  75 };
  76
  77 const char *__attribute_const__ ib_event_msg(enum ib_event_type event)
  78 {
  79         size_t index = event;
  80
  81         return (index < ARRAY_SIZE(ib_events) && ib_events[index]) ?
  82                         ib_events[index] : "unrecognized event";
  83 }
  84 EXPORT_SYMBOL(ib_event_msg);
  85
  86 static const char * const wc_statuses[] = {
  87         [IB_WC_SUCCESS]                 = "success",
  88         [IB_WC_LOC_LEN_ERR]             = "local length error",
  89         [IB_WC_LOC_QP_OP_ERR]           = "local QP operation error",
  90         [IB_WC_LOC_EEC_OP_ERR]          = "local EE context operation error",
  91         [IB_WC_LOC_PROT_ERR]            = "local protection error",
  92         [IB_WC_WR_FLUSH_ERR]            = "WR flushed",
  93         [IB_WC_MW_BIND_ERR]             = "memory management operation error",
  94         [IB_WC_BAD_RESP_ERR]            = "bad response error",
  95         [IB_WC_LOC_ACCESS_ERR]          = "local access error",
  96         [IB_WC_REM_INV_REQ_ERR]         = "invalid request error",
  97         [IB_WC_REM_ACCESS_ERR]          = "remote access error",
  98         [IB_WC_REM_OP_ERR]              = "remote operation error",
  99         [IB_WC_RETRY_EXC_ERR]           = "transport retry counter exceeded",
 100         [IB_WC_RNR_RETRY_EXC_ERR]       = "RNR retry counter exceeded",
 101         [IB_WC_LOC_RDD_VIOL_ERR]        = "local RDD violation error",
 102         [IB_WC_REM_INV_RD_REQ_ERR]      = "remote invalid RD request",
 103         [IB_WC_REM_ABORT_ERR]           = "operation aborted",
 104         [IB_WC_INV_EECN_ERR]            = "invalid EE context number",
 105         [IB_WC_INV_EEC_STATE_ERR]       = "invalid EE context state",
 106         [IB_WC_FATAL_ERR]               = "fatal error",
 107         [IB_WC_RESP_TIMEOUT_ERR]        = "response timeout error",
 108         [IB_WC_GENERAL_ERR]             = "general error",
 109 };
 110
 111 const char *__attribute_const__ ib_wc_status_msg(enum ib_wc_status status)
 112 {
 113         size_t index = status;
 114
 115         return (index < ARRAY_SIZE(wc_statuses) && wc_statuses[index]) ?
 116                         wc_statuses[index] : "unrecognized status";
 117 }
 118 EXPORT_SYMBOL(ib_wc_status_msg);
 119
 120 __attribute_const__ int ib_rate_to_mult(enum ib_rate rate)
 121 {
 122         switch (rate) {
 123         case IB_RATE_2_5_GBPS: return  1;
 124         case IB_RATE_5_GBPS:   return  2;
 125         case IB_RATE_10_GBPS:  return  4;
 126         case IB_RATE_20_GBPS:  return  8;
 127         case IB_RATE_30_GBPS:  return 12;
 128         case IB_RATE_40_GBPS:  return 16;
 129         case IB_RATE_60_GBPS:  return 24;
 130         case IB_RATE_80_GBPS:  return 32;
 131         case IB_RATE_120_GBPS: return 48;
 132         default:               return -1;
 133         }
 134 }
 135 EXPORT_SYMBOL(ib_rate_to_mult);
 136
 137 __attribute_const__ enum ib_rate mult_to_ib_rate(int mult)
 138 {
 139         switch (mult) {
 140         case 1:  return IB_RATE_2_5_GBPS;
 141         case 2:  return IB_RATE_5_GBPS;
 142         case 4:  return IB_RATE_10_GBPS;
 143         case 8:  return IB_RATE_20_GBPS;
 144         case 12: return IB_RATE_30_GBPS;
 145         case 16: return IB_RATE_40_GBPS;
 146         case 24: return IB_RATE_60_GBPS;
 147         case 32: return IB_RATE_80_GBPS;
 148         case 48: return IB_RATE_120_GBPS;
 149         default: return IB_RATE_PORT_CURRENT;
 150         }
 151 }
 152 EXPORT_SYMBOL(mult_to_ib_rate);
 153
 154 __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate)
 155 {
 156         switch (rate) {
 157         case IB_RATE_2_5_GBPS: return 2500;
 158         case IB_RATE_5_GBPS:   return 5000;
 159         case IB_RATE_10_GBPS:  return 10000;
 160         case IB_RATE_20_GBPS:  return 20000;
 161         case IB_RATE_30_GBPS:  return 30000;
 162         case IB_RATE_40_GBPS:  return 40000;
 163         case IB_RATE_60_GBPS:  return 60000;
 164         case IB_RATE_80_GBPS:  return 80000;
 165         case IB_RATE_120_GBPS: return 120000;
 166         case IB_RATE_14_GBPS:  return 14062;
 167         case IB_RATE_56_GBPS:  return 56250;
 168         case IB_RATE_112_GBPS: return 112500;
 169         case IB_RATE_168_GBPS: return 168750;
 170         case IB_RATE_25_GBPS:  return 25781;
 171         case IB_RATE_100_GBPS: return 103125;
 172         case IB_RATE_200_GBPS: return 206250;
 173         case IB_RATE_300_GBPS: return 309375;
 174         default:               return -1;
 175         }
 176 }
 177 EXPORT_SYMBOL(ib_rate_to_mbps);
 178
 179 __attribute_const__ enum rdma_transport_type
 180 rdma_node_get_transport(enum rdma_node_type node_type)
 181 {
 182         switch (node_type) {
 183         case RDMA_NODE_IB_CA:
 184         case RDMA_NODE_IB_SWITCH:
 185         case RDMA_NODE_IB_ROUTER:
 186                 return RDMA_TRANSPORT_IB;
 187         case RDMA_NODE_RNIC:
 188                 return RDMA_TRANSPORT_IWARP;
 189         case RDMA_NODE_USNIC:
 190                 return RDMA_TRANSPORT_USNIC;
 191         case RDMA_NODE_USNIC_UDP:
 192                 return RDMA_TRANSPORT_USNIC_UDP;
 193         default:
 194                 BUG();
 195                 return 0;
 196         }
 197 }
 198 EXPORT_SYMBOL(rdma_node_get_transport);
 199
 200 enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device, u8 port_num)
 201 {
 202         if (device->get_link_layer)
 203                 return device->get_link_layer(device, port_num);
 204
 205         switch (rdma_node_get_transport(device->node_type)) {
 206         case RDMA_TRANSPORT_IB:
 207                 return IB_LINK_LAYER_INFINIBAND;
 208         case RDMA_TRANSPORT_IWARP:
 209         case RDMA_TRANSPORT_USNIC:
 210         case RDMA_TRANSPORT_USNIC_UDP:
 211                 return IB_LINK_LAYER_ETHERNET;
 212         default:
 213                 return IB_LINK_LAYER_UNSPECIFIED;
 214         }
 215 }
 216 EXPORT_SYMBOL(rdma_port_get_link_layer);
 217
 218 /* Protection domains */
 219
 220 /**
 221  * ib_alloc_pd - Allocates an unused protection domain.
 222  * @device: The device on which to allocate the protection domain.
 223  *
 224  * A protection domain object provides an association between QPs, shared
 225  * receive queues, address handles, memory regions, and memory windows.
 226  *
 227  * Every PD has a local_dma_lkey which can be used as the lkey value for local
 228  * memory operations.
 229  */
 230 struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags,
 231                 const char *caller)
 232 {
 233         struct ib_pd *pd;
 234         int mr_access_flags = 0;
 235
 236         pd = device->alloc_pd(device, NULL, NULL);
 237         if (IS_ERR(pd))
 238                 return pd;
 239
 240         pd->device = device;
 241         pd->uobject = NULL;
 242         pd->__internal_mr = NULL;
 243         atomic_set(&pd->usecnt, 0);
 244         pd->flags = flags;
 245
 246         if (device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
 247                 pd->local_dma_lkey = device->local_dma_lkey;
 248         else
 249                 mr_access_flags |= IB_ACCESS_LOCAL_WRITE;
 250
 251         if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
 252                 pr_warn("%s: enabling unsafe global rkey\n", caller);
 253                 mr_access_flags |= IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE;
 254         }
 255
 256         if (mr_access_flags) {
 257                 struct ib_mr *mr;
 258
 259                 mr = pd->device->get_dma_mr(pd, mr_access_flags);
 260                 if (IS_ERR(mr)) {
 261                         ib_dealloc_pd(pd);
 262                         return ERR_CAST(mr);
 263                 }
 264
 265                 mr->device      = pd->device;
 266                 mr->pd          = pd;
 267                 mr->uobject     = NULL;
 268                 mr->need_inval  = false;
 269
 270                 pd->__internal_mr = mr;
 271
 272                 if (!(device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY))
 273                         pd->local_dma_lkey = pd->__internal_mr->lkey;
 274
 275                 if (flags & IB_PD_UNSAFE_GLOBAL_RKEY)
 276                         pd->unsafe_global_rkey = pd->__internal_mr->rkey;
 277         }
 278
 279         return pd;
 280 }
 281 EXPORT_SYMBOL(__ib_alloc_pd);
 282
 283 /**
 284  * ib_dealloc_pd - Deallocates a protection domain.
 285  * @pd: The protection domain to deallocate.
 286  *
 287  * It is an error to call this function while any resources in the pd still
 288  * exist.  The caller is responsible to synchronously destroy them and
 289  * guarantee no new allocations will happen.
 290  */
 291 void ib_dealloc_pd(struct ib_pd *pd)
 292 {
 293         int ret;
 294
 295         if (pd->__internal_mr) {
 296                 ret = pd->device->dereg_mr(pd->__internal_mr);
 297                 WARN_ON(ret);
 298                 pd->__internal_mr = NULL;
 299         }
 300
 301         /* uverbs manipulates usecnt with proper locking, while the kabi
 302            requires the caller to guarantee we can't race here. */
 303         WARN_ON(atomic_read(&pd->usecnt));
 304
 305         /* Making delalloc_pd a void return is a WIP, no driver should return
 306            an error here. */
 307         ret = pd->device->dealloc_pd(pd);
 308         WARN_ONCE(ret, "Infiniband HW driver failed dealloc_pd");
 309 }
 310 EXPORT_SYMBOL(ib_dealloc_pd);
 311
 312 /* Address handles */
 313
 314 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
 315 {
 316         struct ib_ah *ah;
 317
 318         ah = pd->device->create_ah(pd, ah_attr);
 319
 320         if (!IS_ERR(ah)) {
 321                 ah->device  = pd->device;
 322                 ah->pd      = pd;
 323                 ah->uobject = NULL;
 324                 atomic_inc(&pd->usecnt);
 325         }
 326
 327         return ah;
 328 }
 329 EXPORT_SYMBOL(ib_create_ah);
 330
 331 static int ib_get_header_version(const union rdma_network_hdr *hdr)
 332 {
 333         const struct iphdr *ip4h = (struct iphdr *)&hdr->roce4grh;
 334         struct iphdr ip4h_checked;
 335         const struct ipv6hdr *ip6h = (struct ipv6hdr *)&hdr->ibgrh;
 336
 337         /* If it's IPv6, the version must be 6, otherwise, the first
 338          * 20 bytes (before the IPv4 header) are garbled.
 339          */
 340         if (ip6h->version != 6)
 341                 return (ip4h->version == 4) ? 4 : 0;
 342         /* version may be 6 or 4 because the first 20 bytes could be garbled */
 343
 344         /* RoCE v2 requires no options, thus header length
 345          * must be 5 words
 346          */
 347         if (ip4h->ihl != 5)
 348                 return 6;
 349
 350         /* Verify checksum.
 351          * We can't write on scattered buffers so we need to copy to
 352          * temp buffer.
 353          */
 354         memcpy(&ip4h_checked, ip4h, sizeof(ip4h_checked));
 355         ip4h_checked.check = 0;
 356         ip4h_checked.check = ip_fast_csum((u8 *)&ip4h_checked, 5);
 357         /* if IPv4 header checksum is OK, believe it */
 358         if (ip4h->check == ip4h_checked.check)
 359                 return 4;
 360         return 6;
 361 }
 362
 363 static enum rdma_network_type ib_get_net_type_by_grh(struct ib_device *device,
 364                                                      u8 port_num,
 365                                                      const struct ib_grh *grh)
 366 {
 367         int grh_version;
 368
 369         if (rdma_protocol_ib(device, port_num))
 370                 return RDMA_NETWORK_IB;
 371
 372         grh_version = ib_get_header_version((union rdma_network_hdr *)grh);
 373
 374         if (grh_version == 4)
 375                 return RDMA_NETWORK_IPV4;
 376
 377         if (grh->next_hdr == IPPROTO_UDP)
 378                 return RDMA_NETWORK_IPV6;
 379
 380         return RDMA_NETWORK_ROCE_V1;
 381 }
 382
 383 struct find_gid_index_context {
 384         u16 vlan_id;
 385         enum ib_gid_type gid_type;
 386 };
 387
 388 static bool find_gid_index(const union ib_gid *gid,
 389                            const struct ib_gid_attr *gid_attr,
 390                            void *context)
 391 {
 392         struct find_gid_index_context *ctx =
 393                 (struct find_gid_index_context *)context;
 394
 395         if (ctx->gid_type != gid_attr->gid_type)
 396                 return false;
 397
 398         if ((!!(ctx->vlan_id != 0xffff) == !is_vlan_dev(gid_attr->ndev)) ||
 399             (is_vlan_dev(gid_attr->ndev) &&
 400              vlan_dev_vlan_id(gid_attr->ndev) != ctx->vlan_id))
 401                 return false;
 402
 403         return true;
 404 }
 405
 406 static int get_sgid_index_from_eth(struct ib_device *device, u8 port_num,
 407                                    u16 vlan_id, const union ib_gid *sgid,
 408                                    enum ib_gid_type gid_type,
 409                                    u16 *gid_index)
 410 {
 411         struct find_gid_index_context context = {.vlan_id = vlan_id,
 412                                                  .gid_type = gid_type};
 413
 414         return ib_find_gid_by_filter(device, sgid, port_num, find_gid_index,
 415                                      &context, gid_index);
 416 }
 417
 418 static int get_gids_from_rdma_hdr(union rdma_network_hdr *hdr,
 419                                   enum rdma_network_type net_type,
 420                                   union ib_gid *sgid, union ib_gid *dgid)
 421 {
 422         struct sockaddr_in  src_in;
 423         struct sockaddr_in  dst_in;
 424         __be32 src_saddr, dst_saddr;
 425
 426         if (!sgid || !dgid)
 427                 return -EINVAL;
 428
 429         if (net_type == RDMA_NETWORK_IPV4) {
 430                 memcpy(&src_in.sin_addr.s_addr,
 431                        &hdr->roce4grh.saddr, 4);
 432                 memcpy(&dst_in.sin_addr.s_addr,
 433                        &hdr->roce4grh.daddr, 4);
 434                 src_saddr = src_in.sin_addr.s_addr;
 435                 dst_saddr = dst_in.sin_addr.s_addr;
 436                 ipv6_addr_set_v4mapped(src_saddr,
 437                                        (struct in6_addr *)sgid);
 438                 ipv6_addr_set_v4mapped(dst_saddr,
 439                                        (struct in6_addr *)dgid);
 440                 return 0;
 441         } else if (net_type == RDMA_NETWORK_IPV6 ||
 442                    net_type == RDMA_NETWORK_IB) {
 443                 *dgid = hdr->ibgrh.dgid;
 444                 *sgid = hdr->ibgrh.sgid;
 445                 return 0;
 446         } else {
 447                 return -EINVAL;
 448         }
 449 }
 450
 451 int ib_init_ah_from_wc(struct ib_device *device, u8 port_num,
 452                        const struct ib_wc *wc, const struct ib_grh *grh,
 453                        struct ib_ah_attr *ah_attr)
 454 {
 455         u32 flow_class;
 456         u16 gid_index;
 457         int ret;
 458         enum rdma_network_type net_type = RDMA_NETWORK_IB;
 459         enum ib_gid_type gid_type = IB_GID_TYPE_IB;
 460         int hoplimit = 0xff;
 461         union ib_gid dgid;
 462         union ib_gid sgid;
 463
 464         memset(ah_attr, 0, sizeof *ah_attr);
 465         if (rdma_cap_eth_ah(device, port_num)) {
 466                 if (wc->wc_flags & IB_WC_WITH_NETWORK_HDR_TYPE)
 467                         net_type = wc->network_hdr_type;
 468                 else
 469                         net_type = ib_get_net_type_by_grh(device, port_num, grh);
 470                 gid_type = ib_network_to_gid_type(net_type);
 471         }
 472         ret = get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type,
 473                                      &sgid, &dgid);
 474         if (ret)
 475                 return ret;
 476
 477         if (rdma_protocol_roce(device, port_num)) {
 478                 int if_index = 0;
 479                 u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ?
 480                                 wc->vlan_id : 0xffff;
 481                 struct net_device *idev;
 482                 struct net_device *resolved_dev;
 483
 484                 if (!(wc->wc_flags & IB_WC_GRH))
 485                         return -EPROTOTYPE;
 486
 487                 if (!device->get_netdev)
 488                         return -EOPNOTSUPP;
 489
 490                 idev = device->get_netdev(device, port_num);
 491                 if (!idev)
 492                         return -ENODEV;
 493
 494                 ret = rdma_addr_find_l2_eth_by_grh(&dgid, &sgid,
 495                                                    ah_attr->dmac,
 496                                                    wc->wc_flags & IB_WC_WITH_VLAN ?
 497                                                    NULL : &vlan_id,
 498                                                    &if_index, &hoplimit);
 499                 if (ret) {
 500                         dev_put(idev);
 501                         return ret;
 502                 }
 503
 504                 resolved_dev = dev_get_by_index(&init_net, if_index);
 505                 if (resolved_dev->flags & IFF_LOOPBACK) {
 506                         dev_put(resolved_dev);
 507                         resolved_dev = idev;
 508                         dev_hold(resolved_dev);
 509                 }
 510                 rcu_read_lock();
 511                 if (resolved_dev != idev && !rdma_is_upper_dev_rcu(idev,
 512                                                                    resolved_dev))
 513                         ret = -EHOSTUNREACH;
 514                 rcu_read_unlock();
 515                 dev_put(idev);
 516                 dev_put(resolved_dev);
 517                 if (ret)
 518                         return ret;
 519
 520                 ret = get_sgid_index_from_eth(device, port_num, vlan_id,
 521                                               &dgid, gid_type, &gid_index);
 522                 if (ret)
 523                         return ret;
 524         }
 525
 526         ah_attr->dlid = wc->slid;
 527         ah_attr->sl = wc->sl;
 528         ah_attr->src_path_bits = wc->dlid_path_bits;
 529         ah_attr->port_num = port_num;
 530
 531         if (wc->wc_flags & IB_WC_GRH) {
 532                 ah_attr->ah_flags = IB_AH_GRH;
 533                 ah_attr->grh.dgid = sgid;
 534
 535                 if (!rdma_cap_eth_ah(device, port_num)) {
 536                         if (dgid.global.interface_id != cpu_to_be64(IB_SA_WELL_KNOWN_GUID)) {
 537                                 ret = ib_find_cached_gid_by_port(device, &dgid,
 538                                                                  IB_GID_TYPE_IB,
 539                                                                  port_num, NULL,
 540                                                                  &gid_index);
 541                                 if (ret)
 542                                         return ret;
 543                         } else {
 544                                 gid_index = 0;
 545                         }
 546                 }
 547
 548                 ah_attr->grh.sgid_index = (u8) gid_index;
 549                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 550                 ah_attr->grh.flow_label = flow_class & 0xFFFFF;
 551                 ah_attr->grh.hop_limit = hoplimit;
 552                 ah_attr->grh.traffic_class = (flow_class >> 20) & 0xFF;
 553         }
 554         return 0;
 555 }
 556 EXPORT_SYMBOL(ib_init_ah_from_wc);
 557
 558 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
 559                                    const struct ib_grh *grh, u8 port_num)
 560 {
 561         struct ib_ah_attr ah_attr;
 562         int ret;
 563
 564         ret = ib_init_ah_from_wc(pd->device, port_num, wc, grh, &ah_attr);
 565         if (ret)
 566                 return ERR_PTR(ret);
 567
 568         return ib_create_ah(pd, &ah_attr);
 569 }
 570 EXPORT_SYMBOL(ib_create_ah_from_wc);
 571
 572 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 573 {
 574         return ah->device->modify_ah ?
 575                 ah->device->modify_ah(ah, ah_attr) :
 576                 -ENOSYS;
 577 }
 578 EXPORT_SYMBOL(ib_modify_ah);
 579
 580 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 581 {
 582         return ah->device->query_ah ?
 583                 ah->device->query_ah(ah, ah_attr) :
 584                 -ENOSYS;
 585 }
 586 EXPORT_SYMBOL(ib_query_ah);
 587
 588 int ib_destroy_ah(struct ib_ah *ah)
 589 {
 590         struct ib_pd *pd;
 591         int ret;
 592
 593         pd = ah->pd;
 594         ret = ah->device->destroy_ah(ah);
 595         if (!ret)
 596                 atomic_dec(&pd->usecnt);
 597
 598         return ret;
 599 }
 600 EXPORT_SYMBOL(ib_destroy_ah);
 601
 602 /* Shared receive queues */
 603
 604 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 605                              struct ib_srq_init_attr *srq_init_attr)
 606 {
 607         struct ib_srq *srq;
 608
 609         if (!pd->device->create_srq)
 610                 return ERR_PTR(-ENOSYS);
 611
 612         srq = pd->device->create_srq(pd, srq_init_attr, NULL);
 613
 614         if (!IS_ERR(srq)) {
 615                 srq->device        = pd->device;
 616                 srq->pd            = pd;
 617                 srq->uobject       = NULL;
 618                 srq->event_handler = srq_init_attr->event_handler;
 619                 srq->srq_context   = srq_init_attr->srq_context;
 620                 srq->srq_type      = srq_init_attr->srq_type;
 621                 if (srq->srq_type == IB_SRQT_XRC) {
 622                         srq->ext.xrc.xrcd = srq_init_attr->ext.xrc.xrcd;
 623                         srq->ext.xrc.cq   = srq_init_attr->ext.xrc.cq;
 624                         atomic_inc(&srq->ext.xrc.xrcd->usecnt);
 625                         atomic_inc(&srq->ext.xrc.cq->usecnt);
 626                 }
 627                 atomic_inc(&pd->usecnt);
 628                 atomic_set(&srq->usecnt, 0);
 629         }
 630
 631         return srq;
 632 }
 633 EXPORT_SYMBOL(ib_create_srq);
 634
 635 int ib_modify_srq(struct ib_srq *srq,
 636                   struct ib_srq_attr *srq_attr,
 637                   enum ib_srq_attr_mask srq_attr_mask)
 638 {
 639         return srq->device->modify_srq ?
 640                 srq->device->modify_srq(srq, srq_attr, srq_attr_mask, NULL) :
 641                 -ENOSYS;
 642 }
 643 EXPORT_SYMBOL(ib_modify_srq);
 644
 645 int ib_query_srq(struct ib_srq *srq,
 646                  struct ib_srq_attr *srq_attr)
 647 {
 648         return srq->device->query_srq ?
 649                 srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 650 }
 651 EXPORT_SYMBOL(ib_query_srq);
 652
 653 int ib_destroy_srq(struct ib_srq *srq)
 654 {
 655         struct ib_pd *pd;
 656         enum ib_srq_type srq_type;
 657         struct ib_xrcd *uninitialized_var(xrcd);
 658         struct ib_cq *uninitialized_var(cq);
 659         int ret;
 660
 661         if (atomic_read(&srq->usecnt))
 662                 return -EBUSY;
 663
 664         pd = srq->pd;
 665         srq_type = srq->srq_type;
 666         if (srq_type == IB_SRQT_XRC) {
 667                 xrcd = srq->ext.xrc.xrcd;
 668                 cq = srq->ext.xrc.cq;
 669         }
 670
 671         ret = srq->device->destroy_srq(srq);
 672         if (!ret) {
 673                 atomic_dec(&pd->usecnt);
 674                 if (srq_type == IB_SRQT_XRC) {
 675                         atomic_dec(&xrcd->usecnt);
 676                         atomic_dec(&cq->usecnt);
 677                 }
 678         }
 679
 680         return ret;
 681 }
 682 EXPORT_SYMBOL(ib_destroy_srq);
 683
 684 /* Queue pairs */
 685
 686 static void __ib_shared_qp_event_handler(struct ib_event *event, void *context)
 687 {
 688         struct ib_qp *qp = context;
 689         unsigned long flags;
 690
 691         spin_lock_irqsave(&qp->device->event_handler_lock, flags);
 692         list_for_each_entry(event->element.qp, &qp->open_list, open_list)
 693                 if (event->element.qp->event_handler)
 694                         event->element.qp->event_handler(event, event->element.qp->qp_context);
 695         spin_unlock_irqrestore(&qp->device->event_handler_lock, flags);
 696 }
 697
 698 static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp)
 699 {
 700         mutex_lock(&xrcd->tgt_qp_mutex);
 701         list_add(&qp->xrcd_list, &xrcd->tgt_qp_list);
 702         mutex_unlock(&xrcd->tgt_qp_mutex);
 703 }
 704
 705 static struct ib_qp *__ib_open_qp(struct ib_qp *real_qp,
 706                                   void (*event_handler)(struct ib_event *, void *),
 707                                   void *qp_context)
 708 {
 709         struct ib_qp *qp;
 710         unsigned long flags;
 711
 712         qp = kzalloc(sizeof *qp, GFP_KERNEL);
 713         if (!qp)
 714                 return ERR_PTR(-ENOMEM);
 715
 716         qp->real_qp = real_qp;
 717         atomic_inc(&real_qp->usecnt);
 718         qp->device = real_qp->device;
 719         qp->event_handler = event_handler;
 720         qp->qp_context = qp_context;
 721         qp->qp_num = real_qp->qp_num;
 722         qp->qp_type = real_qp->qp_type;
 723
 724         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
 725         list_add(&qp->open_list, &real_qp->open_list);
 726         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
 727
 728         return qp;
 729 }
 730
 731 struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd,
 732                          struct ib_qp_open_attr *qp_open_attr)
 733 {
 734         struct ib_qp *qp, *real_qp;
 735
 736         if (qp_open_attr->qp_type != IB_QPT_XRC_TGT)
 737                 return ERR_PTR(-EINVAL);
 738
 739         qp = ERR_PTR(-EINVAL);
 740         mutex_lock(&xrcd->tgt_qp_mutex);
 741         list_for_each_entry(real_qp, &xrcd->tgt_qp_list, xrcd_list) {
 742                 if (real_qp->qp_num == qp_open_attr->qp_num) {
 743                         qp = __ib_open_qp(real_qp, qp_open_attr->event_handler,
 744                                           qp_open_attr->qp_context);
 745                         break;
 746                 }
 747         }
 748         mutex_unlock(&xrcd->tgt_qp_mutex);
 749         return qp;
 750 }
 751 EXPORT_SYMBOL(ib_open_qp);
 752
 753 static struct ib_qp *ib_create_xrc_qp(struct ib_qp *qp,
 754                 struct ib_qp_init_attr *qp_init_attr)
 755 {
 756         struct ib_qp *real_qp = qp;
 757
 758         qp->event_handler = __ib_shared_qp_event_handler;
 759         qp->qp_context = qp;
 760         qp->pd = NULL;
 761         qp->send_cq = qp->recv_cq = NULL;
 762         qp->srq = NULL;
 763         qp->xrcd = qp_init_attr->xrcd;
 764         atomic_inc(&qp_init_attr->xrcd->usecnt);
 765         INIT_LIST_HEAD(&qp->open_list);
 766
 767         qp = __ib_open_qp(real_qp, qp_init_attr->event_handler,
 768                           qp_init_attr->qp_context);
 769         if (!IS_ERR(qp))
 770                 __ib_insert_xrcd_qp(qp_init_attr->xrcd, real_qp);
 771         else
 772                 real_qp->device->destroy_qp(real_qp);
 773         return qp;
 774 }
 775
 776 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 777                            struct ib_qp_init_attr *qp_init_attr)
 778 {
 779         struct ib_device *device = pd ? pd->device : qp_init_attr->xrcd->device;
 780         struct ib_qp *qp;
 781         int ret;
 782
 783         if (qp_init_attr->rwq_ind_tbl &&
 784             (qp_init_attr->recv_cq ||
 785             qp_init_attr->srq || qp_init_attr->cap.max_recv_wr ||
 786             qp_init_attr->cap.max_recv_sge))
 787                 return ERR_PTR(-EINVAL);
 788
 789         /*
 790          * If the callers is using the RDMA API calculate the resources
 791          * needed for the RDMA READ/WRITE operations.
 792          *
 793          * Note that these callers need to pass in a port number.
 794          */
 795         if (qp_init_attr->cap.max_rdma_ctxs)
 796                 rdma_rw_init_qp(device, qp_init_attr);
 797
 798         qp = device->create_qp(pd, qp_init_attr, NULL);
 799         if (IS_ERR(qp))
 800                 return qp;
 801
 802         qp->device     = device;
 803         qp->real_qp    = qp;
 804         qp->uobject    = NULL;
 805         qp->qp_type    = qp_init_attr->qp_type;
 806         qp->rwq_ind_tbl = qp_init_attr->rwq_ind_tbl;
 807
 808         atomic_set(&qp->usecnt, 0);
 809         qp->mrs_used = 0;
 810         spin_lock_init(&qp->mr_lock);
 811         INIT_LIST_HEAD(&qp->rdma_mrs);
 812         INIT_LIST_HEAD(&qp->sig_mrs);
 813
 814         if (qp_init_attr->qp_type == IB_QPT_XRC_TGT)
 815                 return ib_create_xrc_qp(qp, qp_init_attr);
 816
 817         qp->event_handler = qp_init_attr->event_handler;
 818         qp->qp_context = qp_init_attr->qp_context;
 819         if (qp_init_attr->qp_type == IB_QPT_XRC_INI) {
 820                 qp->recv_cq = NULL;
 821                 qp->srq = NULL;
 822         } else {
 823                 qp->recv_cq = qp_init_attr->recv_cq;
 824                 if (qp_init_attr->recv_cq)
 825                         atomic_inc(&qp_init_attr->recv_cq->usecnt);
 826                 qp->srq = qp_init_attr->srq;
 827                 if (qp->srq)
 828                         atomic_inc(&qp_init_attr->srq->usecnt);
 829         }
 830
 831         qp->pd      = pd;
 832         qp->send_cq = qp_init_attr->send_cq;
 833         qp->xrcd    = NULL;
 834
 835         atomic_inc(&pd->usecnt);
 836         if (qp_init_attr->send_cq)
 837                 atomic_inc(&qp_init_attr->send_cq->usecnt);
 838         if (qp_init_attr->rwq_ind_tbl)
 839                 atomic_inc(&qp->rwq_ind_tbl->usecnt);
 840
 841         if (qp_init_attr->cap.max_rdma_ctxs) {
 842                 ret = rdma_rw_init_mrs(qp, qp_init_attr);
 843                 if (ret) {
 844                         pr_err("failed to init MR pool ret= %d\n", ret);
 845                         ib_destroy_qp(qp);
 846                         return ERR_PTR(ret);
 847                 }
 848         }
 849
 850         /*
 851          * Note: all hw drivers guarantee that max_send_sge is lower than
 852          * the device RDMA WRITE SGE limit but not all hw drivers ensure that
 853          * max_send_sge <= max_sge_rd.
 854          */
 855         qp->max_write_sge = qp_init_attr->cap.max_send_sge;
 856         qp->max_read_sge = min_t(u32, qp_init_attr->cap.max_send_sge,
 857                                  device->attrs.max_sge_rd);
 858
 859         return qp;
 860 }
 861 EXPORT_SYMBOL(ib_create_qp);
 862
 863 static const struct {
 864         int                     valid;
 865         enum ib_qp_attr_mask    req_param[IB_QPT_MAX];
 866         enum ib_qp_attr_mask    opt_param[IB_QPT_MAX];
 867 } qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
 868         [IB_QPS_RESET] = {
 869                 [IB_QPS_RESET] = { .valid = 1 },
 870                 [IB_QPS_INIT]  = {
 871                         .valid = 1,
 872                         .req_param = {
 873                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 874                                                 IB_QP_PORT                      |
 875                                                 IB_QP_QKEY),
 876                                 [IB_QPT_RAW_PACKET] = IB_QP_PORT,
 877                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 878                                                 IB_QP_PORT                      |
 879                                                 IB_QP_ACCESS_FLAGS),
 880                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 881                                                 IB_QP_PORT                      |
 882                                                 IB_QP_ACCESS_FLAGS),
 883                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 884                                                 IB_QP_PORT                      |
 885                                                 IB_QP_ACCESS_FLAGS),
 886                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 887                                                 IB_QP_PORT                      |
 888                                                 IB_QP_ACCESS_FLAGS),
 889                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 890                                                 IB_QP_QKEY),
 891                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 892                                                 IB_QP_QKEY),
 893                         }
 894                 },
 895         },
 896         [IB_QPS_INIT]  = {
 897                 [IB_QPS_RESET] = { .valid = 1 },
 898                 [IB_QPS_ERR] =   { .valid = 1 },
 899                 [IB_QPS_INIT]  = {
 900                         .valid = 1,
 901                         .opt_param = {
 902                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
 903                                                 IB_QP_PORT                      |
 904                                                 IB_QP_QKEY),
 905                                 [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
 906                                                 IB_QP_PORT                      |
 907                                                 IB_QP_ACCESS_FLAGS),
 908                                 [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
 909                                                 IB_QP_PORT                      |
 910                                                 IB_QP_ACCESS_FLAGS),
 911                                 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
 912                                                 IB_QP_PORT                      |
 913                                                 IB_QP_ACCESS_FLAGS),
 914                                 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
 915                                                 IB_QP_PORT                      |
 916                                                 IB_QP_ACCESS_FLAGS),
 917                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
 918                                                 IB_QP_QKEY),
 919                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
 920                                                 IB_QP_QKEY),
 921                         }
 922                 },
 923                 [IB_QPS_RTR]   = {
 924                         .valid = 1,
 925                         .req_param = {
 926                                 [IB_QPT_UC]  = (IB_QP_AV                        |
 927                                                 IB_QP_PATH_MTU                  |
 928                                                 IB_QP_DEST_QPN                  |
 929                                                 IB_QP_RQ_PSN),
 930                                 [IB_QPT_RC]  = (IB_QP_AV                        |
 931                                                 IB_QP_PATH_MTU                  |
 932                                                 IB_QP_DEST_QPN                  |
 933                                                 IB_QP_RQ_PSN                    |
 934                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 935                                                 IB_QP_MIN_RNR_TIMER),
 936                                 [IB_QPT_XRC_INI] = (IB_QP_AV                    |
 937                                                 IB_QP_PATH_MTU                  |
 938                                                 IB_QP_DEST_QPN                  |
 939                                                 IB_QP_RQ_PSN),
 940                                 [IB_QPT_XRC_TGT] = (IB_QP_AV                    |
 941                                                 IB_QP_PATH_MTU                  |
 942                                                 IB_QP_DEST_QPN                  |
 943                                                 IB_QP_RQ_PSN                    |
 944                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
 945                                                 IB_QP_MIN_RNR_TIMER),
 946                         },
 947                         .opt_param = {
 948                                  [IB_QPT_UD]  = (IB_QP_PKEY_INDEX               |
 949                                                  IB_QP_QKEY),
 950                                  [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
 951                                                  IB_QP_ACCESS_FLAGS             |
 952                                                  IB_QP_PKEY_INDEX),
 953                                  [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
 954                                                  IB_QP_ACCESS_FLAGS             |
 955                                                  IB_QP_PKEY_INDEX),
 956                                  [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH             |
 957                                                  IB_QP_ACCESS_FLAGS             |
 958                                                  IB_QP_PKEY_INDEX),
 959                                  [IB_QPT_XRC_TGT] = (IB_QP_ALT_PATH             |
 960                                                  IB_QP_ACCESS_FLAGS             |
 961                                                  IB_QP_PKEY_INDEX),
 962                                  [IB_QPT_SMI] = (IB_QP_PKEY_INDEX               |
 963                                                  IB_QP_QKEY),
 964                                  [IB_QPT_GSI] = (IB_QP_PKEY_INDEX               |
 965                                                  IB_QP_QKEY),
 966                          },
 967                 },
 968         },
 969         [IB_QPS_RTR]   = {
 970                 [IB_QPS_RESET] = { .valid = 1 },
 971                 [IB_QPS_ERR] =   { .valid = 1 },
 972                 [IB_QPS_RTS]   = {
 973                         .valid = 1,
 974                         .req_param = {
 975                                 [IB_QPT_UD]  = IB_QP_SQ_PSN,
 976                                 [IB_QPT_UC]  = IB_QP_SQ_PSN,
 977                                 [IB_QPT_RC]  = (IB_QP_TIMEOUT                   |
 978                                                 IB_QP_RETRY_CNT                 |
 979                                                 IB_QP_RNR_RETRY                 |
 980                                                 IB_QP_SQ_PSN                    |
 981                                                 IB_QP_MAX_QP_RD_ATOMIC),
 982                                 [IB_QPT_XRC_INI] = (IB_QP_TIMEOUT               |
 983                                                 IB_QP_RETRY_CNT                 |
 984                                                 IB_QP_RNR_RETRY                 |
 985                                                 IB_QP_SQ_PSN                    |
 986                                                 IB_QP_MAX_QP_RD_ATOMIC),
 987                                 [IB_QPT_XRC_TGT] = (IB_QP_TIMEOUT               |
 988                                                 IB_QP_SQ_PSN),
 989                                 [IB_QPT_SMI] = IB_QP_SQ_PSN,
 990                                 [IB_QPT_GSI] = IB_QP_SQ_PSN,
 991                         },
 992                         .opt_param = {
 993                                  [IB_QPT_UD]  = (IB_QP_CUR_STATE                |
 994                                                  IB_QP_QKEY),
 995                                  [IB_QPT_UC]  = (IB_QP_CUR_STATE                |
 996                                                  IB_QP_ALT_PATH                 |
 997                                                  IB_QP_ACCESS_FLAGS             |
 998                                                  IB_QP_PATH_MIG_STATE),
 999                                  [IB_QPT_RC]  = (IB_QP_CUR_STATE                |
1000                                                  IB_QP_ALT_PATH                 |
1001                                                  IB_QP_ACCESS_FLAGS             |
1002                                                  IB_QP_MIN_RNR_TIMER            |
1003                                                  IB_QP_PATH_MIG_STATE),
1004                                  [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE            |
1005                                                  IB_QP_ALT_PATH                 |
1006                                                  IB_QP_ACCESS_FLAGS             |
1007                                                  IB_QP_PATH_MIG_STATE),
1008                                  [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE            |
1009                                                  IB_QP_ALT_PATH                 |
1010                                                  IB_QP_ACCESS_FLAGS             |
1011                                                  IB_QP_MIN_RNR_TIMER            |
1012                                                  IB_QP_PATH_MIG_STATE),
1013                                  [IB_QPT_SMI] = (IB_QP_CUR_STATE                |
1014                                                  IB_QP_QKEY),
1015                                  [IB_QPT_GSI] = (IB_QP_CUR_STATE                |
1016                                                  IB_QP_QKEY),
1017                          }
1018                 }
1019         },
1020         [IB_QPS_RTS]   = {
1021                 [IB_QPS_RESET] = { .valid = 1 },
1022                 [IB_QPS_ERR] =   { .valid = 1 },
1023                 [IB_QPS_RTS]   = {
1024                         .valid = 1,
1025                         .opt_param = {
1026                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
1027                                                 IB_QP_QKEY),
1028                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
1029                                                 IB_QP_ACCESS_FLAGS              |
1030                                                 IB_QP_ALT_PATH                  |
1031                                                 IB_QP_PATH_MIG_STATE),
1032                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
1033                                                 IB_QP_ACCESS_FLAGS              |
1034                                                 IB_QP_ALT_PATH                  |
1035                                                 IB_QP_PATH_MIG_STATE            |
1036                                                 IB_QP_MIN_RNR_TIMER),
1037                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
1038                                                 IB_QP_ACCESS_FLAGS              |
1039                                                 IB_QP_ALT_PATH                  |
1040                                                 IB_QP_PATH_MIG_STATE),
1041                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
1042                                                 IB_QP_ACCESS_FLAGS              |
1043                                                 IB_QP_ALT_PATH                  |
1044                                                 IB_QP_PATH_MIG_STATE            |
1045                                                 IB_QP_MIN_RNR_TIMER),
1046                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
1047                                                 IB_QP_QKEY),
1048                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
1049                                                 IB_QP_QKEY),
1050                         }
1051                 },
1052                 [IB_QPS_SQD]   = {
1053                         .valid = 1,
1054                         .opt_param = {
1055                                 [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
1056                                 [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
1057                                 [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
1058                                 [IB_QPT_XRC_INI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
1059                                 [IB_QPT_XRC_TGT] = IB_QP_EN_SQD_ASYNC_NOTIFY, /* ??? */
1060                                 [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
1061                                 [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
1062                         }
1063                 },
1064         },
1065         [IB_QPS_SQD]   = {
1066                 [IB_QPS_RESET] = { .valid = 1 },
1067                 [IB_QPS_ERR] =   { .valid = 1 },
1068                 [IB_QPS_RTS]   = {
1069                         .valid = 1,
1070                         .opt_param = {
1071                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
1072                                                 IB_QP_QKEY),
1073                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
1074                                                 IB_QP_ALT_PATH                  |
1075                                                 IB_QP_ACCESS_FLAGS              |
1076                                                 IB_QP_PATH_MIG_STATE),
1077                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
1078                                                 IB_QP_ALT_PATH                  |
1079                                                 IB_QP_ACCESS_FLAGS              |
1080                                                 IB_QP_MIN_RNR_TIMER             |
1081                                                 IB_QP_PATH_MIG_STATE),
1082                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
1083                                                 IB_QP_ALT_PATH                  |
1084                                                 IB_QP_ACCESS_FLAGS              |
1085                                                 IB_QP_PATH_MIG_STATE),
1086                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
1087                                                 IB_QP_ALT_PATH                  |
1088                                                 IB_QP_ACCESS_FLAGS              |
1089                                                 IB_QP_MIN_RNR_TIMER             |
1090                                                 IB_QP_PATH_MIG_STATE),
1091                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
1092                                                 IB_QP_QKEY),
1093                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
1094                                                 IB_QP_QKEY),
1095                         }
1096                 },
1097                 [IB_QPS_SQD]   = {
1098                         .valid = 1,
1099                         .opt_param = {
1100                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
1101                                                 IB_QP_QKEY),
1102                                 [IB_QPT_UC]  = (IB_QP_AV                        |
1103                                                 IB_QP_ALT_PATH                  |
1104                                                 IB_QP_ACCESS_FLAGS              |
1105                                                 IB_QP_PKEY_INDEX                |
1106                                                 IB_QP_PATH_MIG_STATE),
1107                                 [IB_QPT_RC]  = (IB_QP_PORT                      |
1108                                                 IB_QP_AV                        |
1109                                                 IB_QP_TIMEOUT                   |
1110                                                 IB_QP_RETRY_CNT                 |
1111                                                 IB_QP_RNR_RETRY                 |
1112                                                 IB_QP_MAX_QP_RD_ATOMIC          |
1113                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
1114                                                 IB_QP_ALT_PATH                  |
1115                                                 IB_QP_ACCESS_FLAGS              |
1116                                                 IB_QP_PKEY_INDEX                |
1117                                                 IB_QP_MIN_RNR_TIMER             |
1118                                                 IB_QP_PATH_MIG_STATE),
1119                                 [IB_QPT_XRC_INI] = (IB_QP_PORT                  |
1120                                                 IB_QP_AV                        |
1121                                                 IB_QP_TIMEOUT                   |
1122                                                 IB_QP_RETRY_CNT                 |
1123                                                 IB_QP_RNR_RETRY                 |
1124                                                 IB_QP_MAX_QP_RD_ATOMIC          |
1125                                                 IB_QP_ALT_PATH                  |
1126                                                 IB_QP_ACCESS_FLAGS              |
1127                                                 IB_QP_PKEY_INDEX                |
1128                                                 IB_QP_PATH_MIG_STATE),
1129                                 [IB_QPT_XRC_TGT] = (IB_QP_PORT                  |
1130                                                 IB_QP_AV                        |
1131                                                 IB_QP_TIMEOUT                   |
1132                                                 IB_QP_MAX_DEST_RD_ATOMIC        |
1133                                                 IB_QP_ALT_PATH                  |
1134                                                 IB_QP_ACCESS_FLAGS              |
1135                                                 IB_QP_PKEY_INDEX                |
1136                                                 IB_QP_MIN_RNR_TIMER             |
1137                                                 IB_QP_PATH_MIG_STATE),
1138                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
1139                                                 IB_QP_QKEY),
1140                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
1141                                                 IB_QP_QKEY),
1142                         }
1143                 }
1144         },
1145         [IB_QPS_SQE]   = {
1146                 [IB_QPS_RESET] = { .valid = 1 },
1147                 [IB_QPS_ERR] =   { .valid = 1 },
1148                 [IB_QPS_RTS]   = {
1149                         .valid = 1,
1150                         .opt_param = {
1151                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
1152                                                 IB_QP_QKEY),
1153                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
1154                                                 IB_QP_ACCESS_FLAGS),
1155                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
1156                                                 IB_QP_QKEY),
1157                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
1158                                                 IB_QP_QKEY),
1159                         }
1160                 }
1161         },
1162         [IB_QPS_ERR] = {
1163                 [IB_QPS_RESET] = { .valid = 1 },
1164                 [IB_QPS_ERR] =   { .valid = 1 }
1165         }
1166 };
1167
1168 int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
1169                        enum ib_qp_type type, enum ib_qp_attr_mask mask,
1170                        enum rdma_link_layer ll)
1171 {
1172         enum ib_qp_attr_mask req_param, opt_param;
1173
1174         if (cur_state  < 0 || cur_state  > IB_QPS_ERR ||
1175             next_state < 0 || next_state > IB_QPS_ERR)
1176                 return 0;
1177
1178         if (mask & IB_QP_CUR_STATE  &&
1179             cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
1180             cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
1181                 return 0;
1182
1183         if (!qp_state_table[cur_state][next_state].valid)
1184                 return 0;
1185
1186         req_param = qp_state_table[cur_state][next_state].req_param[type];
1187         opt_param = qp_state_table[cur_state][next_state].opt_param[type];
1188
1189         if ((mask & req_param) != req_param)
1190                 return 0;
1191
1192         if (mask & ~(req_param | opt_param | IB_QP_STATE))
1193                 return 0;
1194
1195         return 1;
1196 }
1197 EXPORT_SYMBOL(ib_modify_qp_is_ok);
1198
1199 int ib_resolve_eth_dmac(struct ib_qp *qp,
1200                         struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1201 {
1202         int           ret = 0;
1203
1204         if (*qp_attr_mask & IB_QP_AV) {
1205                 if (qp_attr->ah_attr.port_num < rdma_start_port(qp->device) ||
1206                     qp_attr->ah_attr.port_num > rdma_end_port(qp->device))
1207                         return -EINVAL;
1208
1209                 if (!rdma_cap_eth_ah(qp->device, qp_attr->ah_attr.port_num))
1210                         return 0;
1211
1212                 if (rdma_link_local_addr((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw)) {
1213                         rdma_get_ll_mac((struct in6_addr *)qp_attr->ah_attr.grh.dgid.raw,
1214                                         qp_attr->ah_attr.dmac);
1215                 } else {
1216                         union ib_gid            sgid;
1217                         struct ib_gid_attr      sgid_attr;
1218                         int                     ifindex;
1219                         int                     hop_limit;
1220
1221                         ret = ib_query_gid(qp->device,
1222                                            qp_attr->ah_attr.port_num,
1223                                            qp_attr->ah_attr.grh.sgid_index,
1224                                            &sgid, &sgid_attr);
1225
1226                         if (ret || !sgid_attr.ndev) {
1227                                 if (!ret)
1228                                         ret = -ENXIO;
1229                                 goto out;
1230                         }
1231
1232                         ifindex = sgid_attr.ndev->ifindex;
1233
1234                         ret = rdma_addr_find_l2_eth_by_grh(&sgid,
1235                                                            &qp_attr->ah_attr.grh.dgid,
1236                                                            qp_attr->ah_attr.dmac,
1237                                                            NULL, &ifindex, &hop_limit);
1238
1239                         dev_put(sgid_attr.ndev);
1240
1241                         qp_attr->ah_attr.grh.hop_limit = hop_limit;
1242                 }
1243         }
1244 out:
1245         return ret;
1246 }
1247 EXPORT_SYMBOL(ib_resolve_eth_dmac);
1248
1249
1250 int ib_modify_qp(struct ib_qp *qp,
1251                  struct ib_qp_attr *qp_attr,
1252                  int qp_attr_mask)
1253 {
1254         int ret;
1255
1256         ret = ib_resolve_eth_dmac(qp, qp_attr, &qp_attr_mask);
1257         if (ret)
1258                 return ret;
1259
1260         return qp->device->modify_qp(qp->real_qp, qp_attr, qp_attr_mask, NULL);
1261 }
1262 EXPORT_SYMBOL(ib_modify_qp);
1263
1264 int ib_query_qp(struct ib_qp *qp,
1265                 struct ib_qp_attr *qp_attr,
1266                 int qp_attr_mask,
1267                 struct ib_qp_init_attr *qp_init_attr)
1268 {
1269         return qp->device->query_qp ?
1270                 qp->device->query_qp(qp->real_qp, qp_attr, qp_attr_mask, qp_init_attr) :
1271                 -ENOSYS;
1272 }
1273 EXPORT_SYMBOL(ib_query_qp);
1274
1275 int ib_close_qp(struct ib_qp *qp)
1276 {
1277         struct ib_qp *real_qp;
1278         unsigned long flags;
1279
1280         real_qp = qp->real_qp;
1281         if (real_qp == qp)
1282                 return -EINVAL;
1283
1284         spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
1285         list_del(&qp->open_list);
1286         spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);
1287
1288         atomic_dec(&real_qp->usecnt);
1289         kfree(qp);
1290
1291         return 0;
1292 }
1293 EXPORT_SYMBOL(ib_close_qp);
1294
1295 static int __ib_destroy_shared_qp(struct ib_qp *qp)
1296 {
1297         struct ib_xrcd *xrcd;
1298         struct ib_qp *real_qp;
1299         int ret;
1300
1301         real_qp = qp->real_qp;
1302         xrcd = real_qp->xrcd;
1303
1304         mutex_lock(&xrcd->tgt_qp_mutex);
1305         ib_close_qp(qp);
1306         if (atomic_read(&real_qp->usecnt) == 0)
1307                 list_del(&real_qp->xrcd_list);
1308         else
1309                 real_qp = NULL;
1310         mutex_unlock(&xrcd->tgt_qp_mutex);
1311
1312         if (real_qp) {
1313                 ret = ib_destroy_qp(real_qp);
1314                 if (!ret)
1315                         atomic_dec(&xrcd->usecnt);
1316                 else
1317                         __ib_insert_xrcd_qp(xrcd, real_qp);
1318         }
1319
1320         return 0;
1321 }
1322
1323 int ib_destroy_qp(struct ib_qp *qp)
1324 {
1325         struct ib_pd *pd;
1326         struct ib_cq *scq, *rcq;
1327         struct ib_srq *srq;
1328         struct ib_rwq_ind_table *ind_tbl;
1329         int ret;
1330
1331         WARN_ON_ONCE(qp->mrs_used > 0);
1332
1333         if (atomic_read(&qp->usecnt))
1334                 return -EBUSY;
1335
1336         if (qp->real_qp != qp)
1337                 return __ib_destroy_shared_qp(qp);
1338
1339         pd   = qp->pd;
1340         scq  = qp->send_cq;
1341         rcq  = qp->recv_cq;
1342         srq  = qp->srq;
1343         ind_tbl = qp->rwq_ind_tbl;
1344
1345         if (!qp->uobject)
1346                 rdma_rw_cleanup_mrs(qp);
1347
1348         ret = qp->device->destroy_qp(qp);
1349         if (!ret) {
1350                 if (pd)
1351                         atomic_dec(&pd->usecnt);
1352                 if (scq)
1353                         atomic_dec(&scq->usecnt);
1354                 if (rcq)
1355                         atomic_dec(&rcq->usecnt);
1356                 if (srq)
1357                         atomic_dec(&srq->usecnt);
1358                 if (ind_tbl)
1359                         atomic_dec(&ind_tbl->usecnt);
1360         }
1361
1362         return ret;
1363 }
1364 EXPORT_SYMBOL(ib_destroy_qp);
1365
1366 /* Completion queues */
1367
1368 struct ib_cq *ib_create_cq(struct ib_device *device,
1369                            ib_comp_handler comp_handler,
1370                            void (*event_handler)(struct ib_event *, void *),
1371                            void *cq_context,
1372                            const struct ib_cq_init_attr *cq_attr)
1373 {
1374         struct ib_cq *cq;
1375
1376         cq = device->create_cq(device, cq_attr, NULL, NULL);
1377
1378         if (!IS_ERR(cq)) {
1379                 cq->device        = device;
1380                 cq->uobject       = NULL;
1381                 cq->comp_handler  = comp_handler;
1382                 cq->event_handler = event_handler;
1383                 cq->cq_context    = cq_context;
1384                 atomic_set(&cq->usecnt, 0);
1385         }
1386
1387         return cq;
1388 }
1389 EXPORT_SYMBOL(ib_create_cq);
1390
1391 int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1392 {
1393         return cq->device->modify_cq ?
1394                 cq->device->modify_cq(cq, cq_count, cq_period) : -ENOSYS;
1395 }
1396 EXPORT_SYMBOL(ib_modify_cq);
1397
1398 int ib_destroy_cq(struct ib_cq *cq)
1399 {
1400         if (atomic_read(&cq->usecnt))
1401                 return -EBUSY;
1402
1403         return cq->device->destroy_cq(cq);
1404 }
1405 EXPORT_SYMBOL(ib_destroy_cq);
1406
1407 int ib_resize_cq(struct ib_cq *cq, int cqe)
1408 {
1409         return cq->device->resize_cq ?
1410                 cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS;
1411 }
1412 EXPORT_SYMBOL(ib_resize_cq);
1413
1414 /* Memory regions */
1415
1416 int ib_dereg_mr(struct ib_mr *mr)
1417 {
1418         struct ib_pd *pd = mr->pd;
1419         int ret;
1420
1421         ret = mr->device->dereg_mr(mr);
1422         if (!ret)
1423                 atomic_dec(&pd->usecnt);
1424
1425         return ret;
1426 }
1427 EXPORT_SYMBOL(ib_dereg_mr);
1428
1429 /**
1430  * ib_alloc_mr() - Allocates a memory region
1431  * @pd:            protection domain associated with the region
1432  * @mr_type:       memory region type
1433  * @max_num_sg:    maximum sg entries available for registration.
1434  *
1435  * Notes:
1436  * Memory registeration page/sg lists must not exceed max_num_sg.
1437  * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed
1438  * max_num_sg * used_page_size.
1439  *
1440  */
1441 struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
1442                           enum ib_mr_type mr_type,
1443                           u32 max_num_sg)
1444 {
1445         struct ib_mr *mr;
1446
1447         if (!pd->device->alloc_mr)
1448                 return ERR_PTR(-ENOSYS);
1449
1450         mr = pd->device->alloc_mr(pd, mr_type, max_num_sg);
1451         if (!IS_ERR(mr)) {
1452                 mr->device  = pd->device;
1453                 mr->pd      = pd;
1454                 mr->uobject = NULL;
1455                 atomic_inc(&pd->usecnt);
1456                 mr->need_inval = false;
1457         }
1458
1459         return mr;
1460 }
1461 EXPORT_SYMBOL(ib_alloc_mr);
1462
1463 /* "Fast" memory regions */
1464
1465 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
1466                             int mr_access_flags,
1467                             struct ib_fmr_attr *fmr_attr)
1468 {
1469         struct ib_fmr *fmr;
1470
1471         if (!pd->device->alloc_fmr)
1472                 return ERR_PTR(-ENOSYS);
1473
1474         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
1475         if (!IS_ERR(fmr)) {
1476                 fmr->device = pd->device;
1477                 fmr->pd     = pd;
1478                 atomic_inc(&pd->usecnt);
1479         }
1480
1481         return fmr;
1482 }
1483 EXPORT_SYMBOL(ib_alloc_fmr);
1484
1485 int ib_unmap_fmr(struct list_head *fmr_list)
1486 {
1487         struct ib_fmr *fmr;
1488
1489         if (list_empty(fmr_list))
1490                 return 0;
1491
1492         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
1493         return fmr->device->unmap_fmr(fmr_list);
1494 }
1495 EXPORT_SYMBOL(ib_unmap_fmr);
1496
1497 int ib_dealloc_fmr(struct ib_fmr *fmr)
1498 {
1499         struct ib_pd *pd;
1500         int ret;
1501
1502         pd = fmr->pd;
1503         ret = fmr->device->dealloc_fmr(fmr);
1504         if (!ret)
1505                 atomic_dec(&pd->usecnt);
1506
1507         return ret;
1508 }
1509 EXPORT_SYMBOL(ib_dealloc_fmr);
1510
1511 /* Multicast groups */
1512
1513 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1514 {
1515         int ret;
1516
1517         if (!qp->device->attach_mcast)
1518                 return -ENOSYS;
1519         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1520                 return -EINVAL;
1521
1522         ret = qp->device->attach_mcast(qp, gid, lid);
1523         if (!ret)
1524                 atomic_inc(&qp->usecnt);
1525         return ret;
1526 }
1527 EXPORT_SYMBOL(ib_attach_mcast);
1528
1529 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
1530 {
1531         int ret;
1532
1533         if (!qp->device->detach_mcast)
1534                 return -ENOSYS;
1535         if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD)
1536                 return -EINVAL;
1537
1538         ret = qp->device->detach_mcast(qp, gid, lid);
1539         if (!ret)
1540                 atomic_dec(&qp->usecnt);
1541         return ret;
1542 }
1543 EXPORT_SYMBOL(ib_detach_mcast);
1544
1545 struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device)
1546 {
1547         struct ib_xrcd *xrcd;
1548
1549         if (!device->alloc_xrcd)
1550                 return ERR_PTR(-ENOSYS);
1551
1552         xrcd = device->alloc_xrcd(device, NULL, NULL);
1553         if (!IS_ERR(xrcd)) {
1554                 xrcd->device = device;
1555                 xrcd->inode = NULL;
1556                 atomic_set(&xrcd->usecnt, 0);
1557                 mutex_init(&xrcd->tgt_qp_mutex);
1558                 INIT_LIST_HEAD(&xrcd->tgt_qp_list);
1559         }
1560
1561         return xrcd;
1562 }
1563 EXPORT_SYMBOL(ib_alloc_xrcd);
1564
1565 int ib_dealloc_xrcd(struct ib_xrcd *xrcd)
1566 {
1567         struct ib_qp *qp;
1568         int ret;
1569
1570         if (atomic_read(&xrcd->usecnt))
1571                 return -EBUSY;
1572
1573         while (!list_empty(&xrcd->tgt_qp_list)) {
1574                 qp = list_entry(xrcd->tgt_qp_list.next, struct ib_qp, xrcd_list);
1575                 ret = ib_destroy_qp(qp);
1576                 if (ret)
1577                         return ret;
1578         }
1579
1580         return xrcd->device->dealloc_xrcd(xrcd);
1581 }
1582 EXPORT_SYMBOL(ib_dealloc_xrcd);
1583
1584 /**
1585  * ib_create_wq - Creates a WQ associated with the specified protection
1586  * domain.
1587  * @pd: The protection domain associated with the WQ.
1588  * @wq_init_attr: A list of initial attributes required to create the
1589  * WQ. If WQ creation succeeds, then the attributes are updated to
1590  * the actual capabilities of the created WQ.
1591  *
1592  * wq_init_attr->max_wr and wq_init_attr->max_sge determine
1593  * the requested size of the WQ, and set to the actual values allocated
1594  * on return.
1595  * If ib_create_wq() succeeds, then max_wr and max_sge will always be
1596  * at least as large as the requested values.
1597  */
1598 struct ib_wq *ib_create_wq(struct ib_pd *pd,
1599                            struct ib_wq_init_attr *wq_attr)
1600 {
1601         struct ib_wq *wq;
1602
1603         if (!pd->device->create_wq)
1604                 return ERR_PTR(-ENOSYS);
1605
1606         wq = pd->device->create_wq(pd, wq_attr, NULL);
1607         if (!IS_ERR(wq)) {
1608                 wq->event_handler = wq_attr->event_handler;
1609                 wq->wq_context = wq_attr->wq_context;
1610                 wq->wq_type = wq_attr->wq_type;
1611                 wq->cq = wq_attr->cq;
1612                 wq->device = pd->device;
1613                 wq->pd = pd;
1614                 wq->uobject = NULL;
1615                 atomic_inc(&pd->usecnt);
1616                 atomic_inc(&wq_attr->cq->usecnt);
1617                 atomic_set(&wq->usecnt, 0);
1618         }
1619         return wq;
1620 }
1621 EXPORT_SYMBOL(ib_create_wq);
1622
1623 /**
1624  * ib_destroy_wq - Destroys the specified WQ.
1625  * @wq: The WQ to destroy.
1626  */
1627 int ib_destroy_wq(struct ib_wq *wq)
1628 {
1629         int err;
1630         struct ib_cq *cq = wq->cq;
1631         struct ib_pd *pd = wq->pd;
1632
1633         if (atomic_read(&wq->usecnt))
1634                 return -EBUSY;
1635
1636         err = wq->device->destroy_wq(wq);
1637         if (!err) {
1638                 atomic_dec(&pd->usecnt);
1639                 atomic_dec(&cq->usecnt);
1640         }
1641         return err;
1642 }
1643 EXPORT_SYMBOL(ib_destroy_wq);
1644
1645 /**
1646  * ib_modify_wq - Modifies the specified WQ.
1647  * @wq: The WQ to modify.
1648  * @wq_attr: On input, specifies the WQ attributes to modify.
1649  * @wq_attr_mask: A bit-mask used to specify which attributes of the WQ
1650  *   are being modified.
1651  * On output, the current values of selected WQ attributes are returned.
1652  */
1653 int ib_modify_wq(struct ib_wq *wq, struct ib_wq_attr *wq_attr,
1654                  u32 wq_attr_mask)
1655 {
1656         int err;
1657
1658         if (!wq->device->modify_wq)
1659                 return -ENOSYS;
1660
1661         err = wq->device->modify_wq(wq, wq_attr, wq_attr_mask, NULL);
1662         return err;
1663 }
1664 EXPORT_SYMBOL(ib_modify_wq);
1665
1666 /*
1667  * ib_create_rwq_ind_table - Creates a RQ Indirection Table.
1668  * @device: The device on which to create the rwq indirection table.
1669  * @ib_rwq_ind_table_init_attr: A list of initial attributes required to
1670  * create the Indirection Table.
1671  *
1672  * Note: The life time of ib_rwq_ind_table_init_attr->ind_tbl is not less
1673  *      than the created ib_rwq_ind_table object and the caller is responsible
1674  *      for its memory allocation/free.
1675  */
1676 struct ib_rwq_ind_table *ib_create_rwq_ind_table(struct ib_device *device,
1677                                                  struct ib_rwq_ind_table_init_attr *init_attr)
1678 {
1679         struct ib_rwq_ind_table *rwq_ind_table;
1680         int i;
1681         u32 table_size;
1682
1683         if (!device->create_rwq_ind_table)
1684                 return ERR_PTR(-ENOSYS);
1685
1686         table_size = (1 << init_attr->log_ind_tbl_size);
1687         rwq_ind_table = device->create_rwq_ind_table(device,
1688                                 init_attr, NULL);
1689         if (IS_ERR(rwq_ind_table))
1690                 return rwq_ind_table;
1691
1692         rwq_ind_table->ind_tbl = init_attr->ind_tbl;
1693         rwq_ind_table->log_ind_tbl_size = init_attr->log_ind_tbl_size;
1694         rwq_ind_table->device = device;
1695         rwq_ind_table->uobject = NULL;
1696         atomic_set(&rwq_ind_table->usecnt, 0);
1697
1698         for (i = 0; i < table_size; i++)
1699                 atomic_inc(&rwq_ind_table->ind_tbl[i]->usecnt);
1700
1701         return rwq_ind_table;
1702 }
1703 EXPORT_SYMBOL(ib_create_rwq_ind_table);
1704
1705 /*
1706  * ib_destroy_rwq_ind_table - Destroys the specified Indirection Table.
1707  * @wq_ind_table: The Indirection Table to destroy.
1708 */
1709 int ib_destroy_rwq_ind_table(struct ib_rwq_ind_table *rwq_ind_table)
1710 {
1711         int err, i;
1712         u32 table_size = (1 << rwq_ind_table->log_ind_tbl_size);
1713         struct ib_wq **ind_tbl = rwq_ind_table->ind_tbl;
1714
1715         if (atomic_read(&rwq_ind_table->usecnt))
1716                 return -EBUSY;
1717
1718         err = rwq_ind_table->device->destroy_rwq_ind_table(rwq_ind_table);
1719         if (!err) {
1720                 for (i = 0; i < table_size; i++)
1721                         atomic_dec(&ind_tbl[i]->usecnt);
1722         }
1723
1724         return err;
1725 }
1726 EXPORT_SYMBOL(ib_destroy_rwq_ind_table);
1727
1728 struct ib_flow *ib_create_flow(struct ib_qp *qp,
1729                                struct ib_flow_attr *flow_attr,
1730                                int domain)
1731 {
1732         struct ib_flow *flow_id;
1733         if (!qp->device->create_flow)
1734                 return ERR_PTR(-ENOSYS);
1735
1736         flow_id = qp->device->create_flow(qp, flow_attr, domain);
1737         if (!IS_ERR(flow_id))
1738                 atomic_inc(&qp->usecnt);
1739         return flow_id;
1740 }
1741 EXPORT_SYMBOL(ib_create_flow);
1742
1743 int ib_destroy_flow(struct ib_flow *flow_id)
1744 {
1745         int err;
1746         struct ib_qp *qp = flow_id->qp;
1747
1748         err = qp->device->destroy_flow(flow_id);
1749         if (!err)
1750                 atomic_dec(&qp->usecnt);
1751         return err;
1752 }
1753 EXPORT_SYMBOL(ib_destroy_flow);
1754
1755 int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
1756                        struct ib_mr_status *mr_status)
1757 {
1758         return mr->device->check_mr_status ?
1759                 mr->device->check_mr_status(mr, check_mask, mr_status) : -ENOSYS;
1760 }
1761 EXPORT_SYMBOL(ib_check_mr_status);
1762
1763 int ib_set_vf_link_state(struct ib_device *device, int vf, u8 port,
1764                          int state)
1765 {
1766         if (!device->set_vf_link_state)
1767                 return -ENOSYS;
1768
1769         return device->set_vf_link_state(device, vf, port, state);
1770 }
1771 EXPORT_SYMBOL(ib_set_vf_link_state);
1772
1773 int ib_get_vf_config(struct ib_device *device, int vf, u8 port,
1774                      struct ifla_vf_info *info)
1775 {
1776         if (!device->get_vf_config)
1777                 return -ENOSYS;
1778
1779         return device->get_vf_config(device, vf, port, info);
1780 }
1781 EXPORT_SYMBOL(ib_get_vf_config);
1782
1783 int ib_get_vf_stats(struct ib_device *device, int vf, u8 port,
1784                     struct ifla_vf_stats *stats)
1785 {
1786         if (!device->get_vf_stats)
1787                 return -ENOSYS;
1788
1789         return device->get_vf_stats(device, vf, port, stats);
1790 }
1791 EXPORT_SYMBOL(ib_get_vf_stats);
1792
1793 int ib_set_vf_guid(struct ib_device *device, int vf, u8 port, u64 guid,
1794                    int type)
1795 {
1796         if (!device->set_vf_guid)
1797                 return -ENOSYS;
1798
1799         return device->set_vf_guid(device, vf, port, guid, type);
1800 }
1801 EXPORT_SYMBOL(ib_set_vf_guid);
1802
1803 /**
1804  * ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list
1805  *     and set it the memory region.
1806  * @mr:            memory region
1807  * @sg:            dma mapped scatterlist
1808  * @sg_nents:      number of entries in sg
1809  * @sg_offset:     offset in bytes into sg
1810  * @page_size:     page vector desired page size
1811  *
1812  * Constraints:
1813  * - The first sg element is allowed to have an offset.
1814  * - Each sg element must either be aligned to page_size or virtually
1815  *   contiguous to the previous element. In case an sg element has a
1816  *   non-contiguous offset, the mapping prefix will not include it.
1817  * - The last sg element is allowed to have length less than page_size.
1818  * - If sg_nents total byte length exceeds the mr max_num_sge * page_size
1819  *   then only max_num_sg entries will be mapped.
1820  * - If the MR was allocated with type IB_MR_TYPE_SG_GAPS, none of these
1821  *   constraints holds and the page_size argument is ignored.
1822  *
1823  * Returns the number of sg elements that were mapped to the memory region.
1824  *
1825  * After this completes successfully, the  memory region
1826  * is ready for registration.
1827  */
1828 int ib_map_mr_sg(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
1829                  unsigned int *sg_offset, unsigned int page_size)
1830 {
1831         if (unlikely(!mr->device->map_mr_sg))
1832                 return -ENOSYS;
1833
1834         mr->page_size = page_size;
1835
1836         return mr->device->map_mr_sg(mr, sg, sg_nents, sg_offset);
1837 }
1838 EXPORT_SYMBOL(ib_map_mr_sg);
1839
1840 /**
1841  * ib_sg_to_pages() - Convert the largest prefix of a sg list
1842  *     to a page vector
1843  * @mr:            memory region
1844  * @sgl:           dma mapped scatterlist
1845  * @sg_nents:      number of entries in sg
1846  * @sg_offset_p:   IN:  start offset in bytes into sg
1847  *                 OUT: offset in bytes for element n of the sg of the first
1848  *                      byte that has not been processed where n is the return
1849  *                      value of this function.
1850  * @set_page:      driver page assignment function pointer
1851  *
1852  * Core service helper for drivers to convert the largest
1853  * prefix of given sg list to a page vector. The sg list
1854  * prefix converted is the prefix that meet the requirements
1855  * of ib_map_mr_sg.
1856  *
1857  * Returns the number of sg elements that were assigned to
1858  * a page vector.
1859  */
1860 int ib_sg_to_pages(struct ib_mr *mr, struct scatterlist *sgl, int sg_nents,
1861                 unsigned int *sg_offset_p, int (*set_page)(struct ib_mr *, u64))
1862 {
1863         struct scatterlist *sg;
1864         u64 last_end_dma_addr = 0;
1865         unsigned int sg_offset = sg_offset_p ? *sg_offset_p : 0;
1866         unsigned int last_page_off = 0;
1867         u64 page_mask = ~((u64)mr->page_size - 1);
1868         int i, ret;
1869
1870         if (unlikely(sg_nents <= 0 || sg_offset > sg_dma_len(&sgl[0])))
1871                 return -EINVAL;
1872
1873         mr->iova = sg_dma_address(&sgl[0]) + sg_offset;
1874         mr->length = 0;
1875
1876         for_each_sg(sgl, sg, sg_nents, i) {
1877                 u64 dma_addr = sg_dma_address(sg) + sg_offset;
1878                 u64 prev_addr = dma_addr;
1879                 unsigned int dma_len = sg_dma_len(sg) - sg_offset;
1880                 u64 end_dma_addr = dma_addr + dma_len;
1881                 u64 page_addr = dma_addr & page_mask;
1882
1883                 /*
1884                  * For the second and later elements, check whether either the
1885                  * end of element i-1 or the start of element i is not aligned
1886                  * on a page boundary.
1887                  */
1888                 if (i && (last_page_off != 0 || page_addr != dma_addr)) {
1889                         /* Stop mapping if there is a gap. */
1890                         if (last_end_dma_addr != dma_addr)
1891                                 break;
1892
1893                         /*
1894                          * Coalesce this element with the last. If it is small
1895                          * enough just update mr->length. Otherwise start
1896                          * mapping from the next page.
1897                          */
1898                         goto next_page;
1899                 }
1900
1901                 do {
1902                         ret = set_page(mr, page_addr);
1903                         if (unlikely(ret < 0)) {
1904                                 sg_offset = prev_addr - sg_dma_address(sg);
1905                                 mr->length += prev_addr - dma_addr;
1906                                 if (sg_offset_p)
1907                                         *sg_offset_p = sg_offset;
1908                                 return i || sg_offset ? i : ret;
1909                         }
1910                         prev_addr = page_addr;
1911 next_page:
1912                         page_addr += mr->page_size;
1913                 } while (page_addr < end_dma_addr);
1914
1915                 mr->length += dma_len;
1916                 last_end_dma_addr = end_dma_addr;
1917                 last_page_off = end_dma_addr & ~page_mask;
1918
1919                 sg_offset = 0;
1920         }
1921
1922         if (sg_offset_p)
1923                 *sg_offset_p = 0;
1924         return i;
1925 }
1926 EXPORT_SYMBOL(ib_sg_to_pages);
1927
1928 struct ib_drain_cqe {
1929         struct ib_cqe cqe;
1930         struct completion done;
1931 };
1932
1933 static void ib_drain_qp_done(struct ib_cq *cq, struct ib_wc *wc)
1934 {
1935         struct ib_drain_cqe *cqe = container_of(wc->wr_cqe, struct ib_drain_cqe,
1936                                                 cqe);
1937
1938         complete(&cqe->done);
1939 }
1940
1941 /*
1942  * Post a WR and block until its completion is reaped for the SQ.
1943  */
1944 static void __ib_drain_sq(struct ib_qp *qp)
1945 {
1946         struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
1947         struct ib_drain_cqe sdrain;
1948         struct ib_send_wr swr = {}, *bad_swr;
1949         int ret;
1950
1951         if (qp->send_cq->poll_ctx == IB_POLL_DIRECT) {
1952                 WARN_ONCE(qp->send_cq->poll_ctx == IB_POLL_DIRECT,
1953                           "IB_POLL_DIRECT poll_ctx not supported for drain\n");
1954                 return;
1955         }
1956
1957         swr.wr_cqe = &sdrain.cqe;
1958         sdrain.cqe.done = ib_drain_qp_done;
1959         init_completion(&sdrain.done);
1960
1961         ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
1962         if (ret) {
1963                 WARN_ONCE(ret, "failed to drain send queue: %d\n", ret);
1964                 return;
1965         }
1966
1967         ret = ib_post_send(qp, &swr, &bad_swr);
1968         if (ret) {
1969                 WARN_ONCE(ret, "failed to drain send queue: %d\n", ret);
1970                 return;
1971         }
1972
1973         wait_for_completion(&sdrain.done);
1974 }
1975
1976 /*
1977  * Post a WR and block until its completion is reaped for the RQ.
1978  */
1979 static void __ib_drain_rq(struct ib_qp *qp)
1980 {
1981         struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
1982         struct ib_drain_cqe rdrain;
1983         struct ib_recv_wr rwr = {}, *bad_rwr;
1984         int ret;
1985
1986         if (qp->recv_cq->poll_ctx == IB_POLL_DIRECT) {
1987                 WARN_ONCE(qp->recv_cq->poll_ctx == IB_POLL_DIRECT,
1988                           "IB_POLL_DIRECT poll_ctx not supported for drain\n");
1989                 return;
1990         }
1991
1992         rwr.wr_cqe = &rdrain.cqe;
1993         rdrain.cqe.done = ib_drain_qp_done;
1994         init_completion(&rdrain.done);
1995
1996         ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
1997         if (ret) {
1998                 WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret);
1999                 return;
2000         }
2001
2002         ret = ib_post_recv(qp, &rwr, &bad_rwr);
2003         if (ret) {
2004                 WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret);
2005                 return;
2006         }
2007
2008         wait_for_completion(&rdrain.done);
2009 }
2010
2011 /**
2012  * ib_drain_sq() - Block until all SQ CQEs have been consumed by the
2013  *                 application.
2014  * @qp:            queue pair to drain
2015  *
2016  * If the device has a provider-specific drain function, then
2017  * call that.  Otherwise call the generic drain function
2018  * __ib_drain_sq().
2019  *
2020  * The caller must:
2021  *
2022  * ensure there is room in the CQ and SQ for the drain work request and
2023  * completion.
2024  *
2025  * allocate the CQ using ib_alloc_cq() and the CQ poll context cannot be
2026  * IB_POLL_DIRECT.
2027  *
2028  * ensure that there are no other contexts that are posting WRs concurrently.
2029  * Otherwise the drain is not guaranteed.
2030  */
2031 void ib_drain_sq(struct ib_qp *qp)
2032 {
2033         if (qp->device->drain_sq)
2034                 qp->device->drain_sq(qp);
2035         else
2036                 __ib_drain_sq(qp);
2037 }
2038 EXPORT_SYMBOL(ib_drain_sq);
2039
2040 /**
2041  * ib_drain_rq() - Block until all RQ CQEs have been consumed by the
2042  *                 application.
2043  * @qp:            queue pair to drain
2044  *
2045  * If the device has a provider-specific drain function, then
2046  * call that.  Otherwise call the generic drain function
2047  * __ib_drain_rq().
2048  *
2049  * The caller must:
2050  *
2051  * ensure there is room in the CQ and RQ for the drain work request and
2052  * completion.
2053  *
2054  * allocate the CQ using ib_alloc_cq() and the CQ poll context cannot be
2055  * IB_POLL_DIRECT.
2056  *
2057  * ensure that there are no other contexts that are posting WRs concurrently.
2058  * Otherwise the drain is not guaranteed.
2059  */
2060 void ib_drain_rq(struct ib_qp *qp)
2061 {
2062         if (qp->device->drain_rq)
2063                 qp->device->drain_rq(qp);
2064         else
2065                 __ib_drain_rq(qp);
2066 }
2067 EXPORT_SYMBOL(ib_drain_rq);
2068
2069 /**
2070  * ib_drain_qp() - Block until all CQEs have been consumed by the
2071  *                 application on both the RQ and SQ.
2072  * @qp:            queue pair to drain
2073  *
2074  * The caller must:
2075  *
2076  * ensure there is room in the CQ(s), SQ, and RQ for drain work requests
2077  * and completions.
2078  *
2079  * allocate the CQs using ib_alloc_cq() and the CQ poll context cannot be
2080  * IB_POLL_DIRECT.
2081  *
2082  * ensure that there are no other contexts that are posting WRs concurrently.
2083  * Otherwise the drain is not guaranteed.
2084  */
2085 void ib_drain_qp(struct ib_qp *qp)
2086 {
2087         ib_drain_sq(qp);
2088         if (!qp->srq)
2089                 ib_drain_rq(qp);
2090 }
2091 EXPORT_SYMBOL(ib_drain_qp);