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