drivers/infiniband/core/sa_query.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Voltaire, Inc.  All rights reserved.
   4  * Copyright (c) 2006 Intel Corporation.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/err.h>
  38 #include <linux/random.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/slab.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/kref.h>
  43 #include <linux/xarray.h>
  44 #include <linux/workqueue.h>
  45 #include <uapi/linux/if_ether.h>
  46 #include <rdma/ib_pack.h>
  47 #include <rdma/ib_cache.h>
  48 #include <rdma/rdma_netlink.h>
  49 #include <net/netlink.h>
  50 #include <uapi/rdma/ib_user_sa.h>
  51 #include <rdma/ib_marshall.h>
  52 #include <rdma/ib_addr.h>
  53 #include <rdma/opa_addr.h>
  54 #include "sa.h"
  55 #include "core_priv.h"
  56
  57 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN             100
  58 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT         2000
  59 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX             200000
  60 #define IB_SA_CPI_MAX_RETRY_CNT                 3
  61 #define IB_SA_CPI_RETRY_WAIT                    1000 /*msecs */
  62 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
  63
  64 struct ib_sa_sm_ah {
  65         struct ib_ah        *ah;
  66         struct kref          ref;
  67         u16                  pkey_index;
  68         u8                   src_path_mask;
  69 };
  70
  71 enum rdma_class_port_info_type {
  72         RDMA_CLASS_PORT_INFO_IB,
  73         RDMA_CLASS_PORT_INFO_OPA
  74 };
  75
  76 struct rdma_class_port_info {
  77         enum rdma_class_port_info_type type;
  78         union {
  79                 struct ib_class_port_info ib;
  80                 struct opa_class_port_info opa;
  81         };
  82 };
  83
  84 struct ib_sa_classport_cache {
  85         bool valid;
  86         int retry_cnt;
  87         struct rdma_class_port_info data;
  88 };
  89
  90 struct ib_sa_port {
  91         struct ib_mad_agent *agent;
  92         struct ib_sa_sm_ah  *sm_ah;
  93         struct work_struct   update_task;
  94         struct ib_sa_classport_cache classport_info;
  95         struct delayed_work ib_cpi_work;
  96         spinlock_t                   classport_lock; /* protects class port info set */
  97         spinlock_t           ah_lock;
  98         u32                  port_num;
  99 };
 100
 101 struct ib_sa_device {
 102         int                     start_port, end_port;
 103         struct ib_event_handler event_handler;
 104         struct ib_sa_port port[];
 105 };
 106
 107 struct ib_sa_query {
 108         void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
 109         void (*release)(struct ib_sa_query *);
 110         struct ib_sa_client    *client;
 111         struct ib_sa_port      *port;
 112         struct ib_mad_send_buf *mad_buf;
 113         struct ib_sa_sm_ah     *sm_ah;
 114         int                     id;
 115         u32                     flags;
 116         struct list_head        list; /* Local svc request list */
 117         u32                     seq; /* Local svc request sequence number */
 118         unsigned long           timeout; /* Local svc timeout */
 119         u8                      path_use; /* How will the pathrecord be used */
 120 };
 121
 122 #define IB_SA_ENABLE_LOCAL_SERVICE      0x00000001
 123 #define IB_SA_CANCEL                    0x00000002
 124 #define IB_SA_QUERY_OPA                 0x00000004
 125
 126 struct ib_sa_service_query {
 127         void (*callback)(int, struct ib_sa_service_rec *, void *);
 128         void *context;
 129         struct ib_sa_query sa_query;
 130 };
 131
 132 struct ib_sa_path_query {
 133         void (*callback)(int, struct sa_path_rec *, void *);
 134         void *context;
 135         struct ib_sa_query sa_query;
 136         struct sa_path_rec *conv_pr;
 137 };
 138
 139 struct ib_sa_guidinfo_query {
 140         void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
 141         void *context;
 142         struct ib_sa_query sa_query;
 143 };
 144
 145 struct ib_sa_classport_info_query {
 146         void (*callback)(void *);
 147         void *context;
 148         struct ib_sa_query sa_query;
 149 };
 150
 151 struct ib_sa_mcmember_query {
 152         void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
 153         void *context;
 154         struct ib_sa_query sa_query;
 155 };
 156
 157 static LIST_HEAD(ib_nl_request_list);
 158 static DEFINE_SPINLOCK(ib_nl_request_lock);
 159 static atomic_t ib_nl_sa_request_seq;
 160 static struct workqueue_struct *ib_nl_wq;
 161 static struct delayed_work ib_nl_timed_work;
 162 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
 163         [LS_NLA_TYPE_PATH_RECORD]       = {.type = NLA_BINARY,
 164                 .len = sizeof(struct ib_path_rec_data)},
 165         [LS_NLA_TYPE_TIMEOUT]           = {.type = NLA_U32},
 166         [LS_NLA_TYPE_SERVICE_ID]        = {.type = NLA_U64},
 167         [LS_NLA_TYPE_DGID]              = {.type = NLA_BINARY,
 168                 .len = sizeof(struct rdma_nla_ls_gid)},
 169         [LS_NLA_TYPE_SGID]              = {.type = NLA_BINARY,
 170                 .len = sizeof(struct rdma_nla_ls_gid)},
 171         [LS_NLA_TYPE_TCLASS]            = {.type = NLA_U8},
 172         [LS_NLA_TYPE_PKEY]              = {.type = NLA_U16},
 173         [LS_NLA_TYPE_QOS_CLASS]         = {.type = NLA_U16},
 174 };
 175
 176
 177 static int ib_sa_add_one(struct ib_device *device);
 178 static void ib_sa_remove_one(struct ib_device *device, void *client_data);
 179
 180 static struct ib_client sa_client = {
 181         .name   = "sa",
 182         .add    = ib_sa_add_one,
 183         .remove = ib_sa_remove_one
 184 };
 185
 186 static DEFINE_XARRAY_FLAGS(queries, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
 187
 188 static DEFINE_SPINLOCK(tid_lock);
 189 static u32 tid;
 190
 191 #define PATH_REC_FIELD(field) \
 192         .struct_offset_bytes = offsetof(struct sa_path_rec, field),     \
 193         .struct_size_bytes   = sizeof_field(struct sa_path_rec, field), \
 194         .field_name          = "sa_path_rec:" #field
 195
 196 static const struct ib_field path_rec_table[] = {
 197         { PATH_REC_FIELD(service_id),
 198           .offset_words = 0,
 199           .offset_bits  = 0,
 200           .size_bits    = 64 },
 201         { PATH_REC_FIELD(dgid),
 202           .offset_words = 2,
 203           .offset_bits  = 0,
 204           .size_bits    = 128 },
 205         { PATH_REC_FIELD(sgid),
 206           .offset_words = 6,
 207           .offset_bits  = 0,
 208           .size_bits    = 128 },
 209         { PATH_REC_FIELD(ib.dlid),
 210           .offset_words = 10,
 211           .offset_bits  = 0,
 212           .size_bits    = 16 },
 213         { PATH_REC_FIELD(ib.slid),
 214           .offset_words = 10,
 215           .offset_bits  = 16,
 216           .size_bits    = 16 },
 217         { PATH_REC_FIELD(ib.raw_traffic),
 218           .offset_words = 11,
 219           .offset_bits  = 0,
 220           .size_bits    = 1 },
 221         { RESERVED,
 222           .offset_words = 11,
 223           .offset_bits  = 1,
 224           .size_bits    = 3 },
 225         { PATH_REC_FIELD(flow_label),
 226           .offset_words = 11,
 227           .offset_bits  = 4,
 228           .size_bits    = 20 },
 229         { PATH_REC_FIELD(hop_limit),
 230           .offset_words = 11,
 231           .offset_bits  = 24,
 232           .size_bits    = 8 },
 233         { PATH_REC_FIELD(traffic_class),
 234           .offset_words = 12,
 235           .offset_bits  = 0,
 236           .size_bits    = 8 },
 237         { PATH_REC_FIELD(reversible),
 238           .offset_words = 12,
 239           .offset_bits  = 8,
 240           .size_bits    = 1 },
 241         { PATH_REC_FIELD(numb_path),
 242           .offset_words = 12,
 243           .offset_bits  = 9,
 244           .size_bits    = 7 },
 245         { PATH_REC_FIELD(pkey),
 246           .offset_words = 12,
 247           .offset_bits  = 16,
 248           .size_bits    = 16 },
 249         { PATH_REC_FIELD(qos_class),
 250           .offset_words = 13,
 251           .offset_bits  = 0,
 252           .size_bits    = 12 },
 253         { PATH_REC_FIELD(sl),
 254           .offset_words = 13,
 255           .offset_bits  = 12,
 256           .size_bits    = 4 },
 257         { PATH_REC_FIELD(mtu_selector),
 258           .offset_words = 13,
 259           .offset_bits  = 16,
 260           .size_bits    = 2 },
 261         { PATH_REC_FIELD(mtu),
 262           .offset_words = 13,
 263           .offset_bits  = 18,
 264           .size_bits    = 6 },
 265         { PATH_REC_FIELD(rate_selector),
 266           .offset_words = 13,
 267           .offset_bits  = 24,
 268           .size_bits    = 2 },
 269         { PATH_REC_FIELD(rate),
 270           .offset_words = 13,
 271           .offset_bits  = 26,
 272           .size_bits    = 6 },
 273         { PATH_REC_FIELD(packet_life_time_selector),
 274           .offset_words = 14,
 275           .offset_bits  = 0,
 276           .size_bits    = 2 },
 277         { PATH_REC_FIELD(packet_life_time),
 278           .offset_words = 14,
 279           .offset_bits  = 2,
 280           .size_bits    = 6 },
 281         { PATH_REC_FIELD(preference),
 282           .offset_words = 14,
 283           .offset_bits  = 8,
 284           .size_bits    = 8 },
 285         { RESERVED,
 286           .offset_words = 14,
 287           .offset_bits  = 16,
 288           .size_bits    = 48 },
 289 };
 290
 291 #define OPA_PATH_REC_FIELD(field) \
 292         .struct_offset_bytes = \
 293                 offsetof(struct sa_path_rec, field), \
 294         .struct_size_bytes   = \
 295                 sizeof_field(struct sa_path_rec, field),        \
 296         .field_name          = "sa_path_rec:" #field
 297
 298 static const struct ib_field opa_path_rec_table[] = {
 299         { OPA_PATH_REC_FIELD(service_id),
 300           .offset_words = 0,
 301           .offset_bits  = 0,
 302           .size_bits    = 64 },
 303         { OPA_PATH_REC_FIELD(dgid),
 304           .offset_words = 2,
 305           .offset_bits  = 0,
 306           .size_bits    = 128 },
 307         { OPA_PATH_REC_FIELD(sgid),
 308           .offset_words = 6,
 309           .offset_bits  = 0,
 310           .size_bits    = 128 },
 311         { OPA_PATH_REC_FIELD(opa.dlid),
 312           .offset_words = 10,
 313           .offset_bits  = 0,
 314           .size_bits    = 32 },
 315         { OPA_PATH_REC_FIELD(opa.slid),
 316           .offset_words = 11,
 317           .offset_bits  = 0,
 318           .size_bits    = 32 },
 319         { OPA_PATH_REC_FIELD(opa.raw_traffic),
 320           .offset_words = 12,
 321           .offset_bits  = 0,
 322           .size_bits    = 1 },
 323         { RESERVED,
 324           .offset_words = 12,
 325           .offset_bits  = 1,
 326           .size_bits    = 3 },
 327         { OPA_PATH_REC_FIELD(flow_label),
 328           .offset_words = 12,
 329           .offset_bits  = 4,
 330           .size_bits    = 20 },
 331         { OPA_PATH_REC_FIELD(hop_limit),
 332           .offset_words = 12,
 333           .offset_bits  = 24,
 334           .size_bits    = 8 },
 335         { OPA_PATH_REC_FIELD(traffic_class),
 336           .offset_words = 13,
 337           .offset_bits  = 0,
 338           .size_bits    = 8 },
 339         { OPA_PATH_REC_FIELD(reversible),
 340           .offset_words = 13,
 341           .offset_bits  = 8,
 342           .size_bits    = 1 },
 343         { OPA_PATH_REC_FIELD(numb_path),
 344           .offset_words = 13,
 345           .offset_bits  = 9,
 346           .size_bits    = 7 },
 347         { OPA_PATH_REC_FIELD(pkey),
 348           .offset_words = 13,
 349           .offset_bits  = 16,
 350           .size_bits    = 16 },
 351         { OPA_PATH_REC_FIELD(opa.l2_8B),
 352           .offset_words = 14,
 353           .offset_bits  = 0,
 354           .size_bits    = 1 },
 355         { OPA_PATH_REC_FIELD(opa.l2_10B),
 356           .offset_words = 14,
 357           .offset_bits  = 1,
 358           .size_bits    = 1 },
 359         { OPA_PATH_REC_FIELD(opa.l2_9B),
 360           .offset_words = 14,
 361           .offset_bits  = 2,
 362           .size_bits    = 1 },
 363         { OPA_PATH_REC_FIELD(opa.l2_16B),
 364           .offset_words = 14,
 365           .offset_bits  = 3,
 366           .size_bits    = 1 },
 367         { RESERVED,
 368           .offset_words = 14,
 369           .offset_bits  = 4,
 370           .size_bits    = 2 },
 371         { OPA_PATH_REC_FIELD(opa.qos_type),
 372           .offset_words = 14,
 373           .offset_bits  = 6,
 374           .size_bits    = 2 },
 375         { OPA_PATH_REC_FIELD(opa.qos_priority),
 376           .offset_words = 14,
 377           .offset_bits  = 8,
 378           .size_bits    = 8 },
 379         { RESERVED,
 380           .offset_words = 14,
 381           .offset_bits  = 16,
 382           .size_bits    = 3 },
 383         { OPA_PATH_REC_FIELD(sl),
 384           .offset_words = 14,
 385           .offset_bits  = 19,
 386           .size_bits    = 5 },
 387         { RESERVED,
 388           .offset_words = 14,
 389           .offset_bits  = 24,
 390           .size_bits    = 8 },
 391         { OPA_PATH_REC_FIELD(mtu_selector),
 392           .offset_words = 15,
 393           .offset_bits  = 0,
 394           .size_bits    = 2 },
 395         { OPA_PATH_REC_FIELD(mtu),
 396           .offset_words = 15,
 397           .offset_bits  = 2,
 398           .size_bits    = 6 },
 399         { OPA_PATH_REC_FIELD(rate_selector),
 400           .offset_words = 15,
 401           .offset_bits  = 8,
 402           .size_bits    = 2 },
 403         { OPA_PATH_REC_FIELD(rate),
 404           .offset_words = 15,
 405           .offset_bits  = 10,
 406           .size_bits    = 6 },
 407         { OPA_PATH_REC_FIELD(packet_life_time_selector),
 408           .offset_words = 15,
 409           .offset_bits  = 16,
 410           .size_bits    = 2 },
 411         { OPA_PATH_REC_FIELD(packet_life_time),
 412           .offset_words = 15,
 413           .offset_bits  = 18,
 414           .size_bits    = 6 },
 415         { OPA_PATH_REC_FIELD(preference),
 416           .offset_words = 15,
 417           .offset_bits  = 24,
 418           .size_bits    = 8 },
 419 };
 420
 421 #define MCMEMBER_REC_FIELD(field) \
 422         .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),      \
 423         .struct_size_bytes   = sizeof_field(struct ib_sa_mcmember_rec, field),  \
 424         .field_name          = "sa_mcmember_rec:" #field
 425
 426 static const struct ib_field mcmember_rec_table[] = {
 427         { MCMEMBER_REC_FIELD(mgid),
 428           .offset_words = 0,
 429           .offset_bits  = 0,
 430           .size_bits    = 128 },
 431         { MCMEMBER_REC_FIELD(port_gid),
 432           .offset_words = 4,
 433           .offset_bits  = 0,
 434           .size_bits    = 128 },
 435         { MCMEMBER_REC_FIELD(qkey),
 436           .offset_words = 8,
 437           .offset_bits  = 0,
 438           .size_bits    = 32 },
 439         { MCMEMBER_REC_FIELD(mlid),
 440           .offset_words = 9,
 441           .offset_bits  = 0,
 442           .size_bits    = 16 },
 443         { MCMEMBER_REC_FIELD(mtu_selector),
 444           .offset_words = 9,
 445           .offset_bits  = 16,
 446           .size_bits    = 2 },
 447         { MCMEMBER_REC_FIELD(mtu),
 448           .offset_words = 9,
 449           .offset_bits  = 18,
 450           .size_bits    = 6 },
 451         { MCMEMBER_REC_FIELD(traffic_class),
 452           .offset_words = 9,
 453           .offset_bits  = 24,
 454           .size_bits    = 8 },
 455         { MCMEMBER_REC_FIELD(pkey),
 456           .offset_words = 10,
 457           .offset_bits  = 0,
 458           .size_bits    = 16 },
 459         { MCMEMBER_REC_FIELD(rate_selector),
 460           .offset_words = 10,
 461           .offset_bits  = 16,
 462           .size_bits    = 2 },
 463         { MCMEMBER_REC_FIELD(rate),
 464           .offset_words = 10,
 465           .offset_bits  = 18,
 466           .size_bits    = 6 },
 467         { MCMEMBER_REC_FIELD(packet_life_time_selector),
 468           .offset_words = 10,
 469           .offset_bits  = 24,
 470           .size_bits    = 2 },
 471         { MCMEMBER_REC_FIELD(packet_life_time),
 472           .offset_words = 10,
 473           .offset_bits  = 26,
 474           .size_bits    = 6 },
 475         { MCMEMBER_REC_FIELD(sl),
 476           .offset_words = 11,
 477           .offset_bits  = 0,
 478           .size_bits    = 4 },
 479         { MCMEMBER_REC_FIELD(flow_label),
 480           .offset_words = 11,
 481           .offset_bits  = 4,
 482           .size_bits    = 20 },
 483         { MCMEMBER_REC_FIELD(hop_limit),
 484           .offset_words = 11,
 485           .offset_bits  = 24,
 486           .size_bits    = 8 },
 487         { MCMEMBER_REC_FIELD(scope),
 488           .offset_words = 12,
 489           .offset_bits  = 0,
 490           .size_bits    = 4 },
 491         { MCMEMBER_REC_FIELD(join_state),
 492           .offset_words = 12,
 493           .offset_bits  = 4,
 494           .size_bits    = 4 },
 495         { MCMEMBER_REC_FIELD(proxy_join),
 496           .offset_words = 12,
 497           .offset_bits  = 8,
 498           .size_bits    = 1 },
 499         { RESERVED,
 500           .offset_words = 12,
 501           .offset_bits  = 9,
 502           .size_bits    = 23 },
 503 };
 504
 505 #define SERVICE_REC_FIELD(field) \
 506         .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field),       \
 507         .struct_size_bytes   = sizeof_field(struct ib_sa_service_rec, field),   \
 508         .field_name          = "sa_service_rec:" #field
 509
 510 static const struct ib_field service_rec_table[] = {
 511         { SERVICE_REC_FIELD(id),
 512           .offset_words = 0,
 513           .offset_bits  = 0,
 514           .size_bits    = 64 },
 515         { SERVICE_REC_FIELD(gid),
 516           .offset_words = 2,
 517           .offset_bits  = 0,
 518           .size_bits    = 128 },
 519         { SERVICE_REC_FIELD(pkey),
 520           .offset_words = 6,
 521           .offset_bits  = 0,
 522           .size_bits    = 16 },
 523         { SERVICE_REC_FIELD(lease),
 524           .offset_words = 7,
 525           .offset_bits  = 0,
 526           .size_bits    = 32 },
 527         { SERVICE_REC_FIELD(key),
 528           .offset_words = 8,
 529           .offset_bits  = 0,
 530           .size_bits    = 128 },
 531         { SERVICE_REC_FIELD(name),
 532           .offset_words = 12,
 533           .offset_bits  = 0,
 534           .size_bits    = 64*8 },
 535         { SERVICE_REC_FIELD(data8),
 536           .offset_words = 28,
 537           .offset_bits  = 0,
 538           .size_bits    = 16*8 },
 539         { SERVICE_REC_FIELD(data16),
 540           .offset_words = 32,
 541           .offset_bits  = 0,
 542           .size_bits    = 8*16 },
 543         { SERVICE_REC_FIELD(data32),
 544           .offset_words = 36,
 545           .offset_bits  = 0,
 546           .size_bits    = 4*32 },
 547         { SERVICE_REC_FIELD(data64),
 548           .offset_words = 40,
 549           .offset_bits  = 0,
 550           .size_bits    = 2*64 },
 551 };
 552
 553 #define CLASSPORTINFO_REC_FIELD(field) \
 554         .struct_offset_bytes = offsetof(struct ib_class_port_info, field),      \
 555         .struct_size_bytes   = sizeof_field(struct ib_class_port_info, field),  \
 556         .field_name          = "ib_class_port_info:" #field
 557
 558 static const struct ib_field ib_classport_info_rec_table[] = {
 559         { CLASSPORTINFO_REC_FIELD(base_version),
 560           .offset_words = 0,
 561           .offset_bits  = 0,
 562           .size_bits    = 8 },
 563         { CLASSPORTINFO_REC_FIELD(class_version),
 564           .offset_words = 0,
 565           .offset_bits  = 8,
 566           .size_bits    = 8 },
 567         { CLASSPORTINFO_REC_FIELD(capability_mask),
 568           .offset_words = 0,
 569           .offset_bits  = 16,
 570           .size_bits    = 16 },
 571         { CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
 572           .offset_words = 1,
 573           .offset_bits  = 0,
 574           .size_bits    = 32 },
 575         { CLASSPORTINFO_REC_FIELD(redirect_gid),
 576           .offset_words = 2,
 577           .offset_bits  = 0,
 578           .size_bits    = 128 },
 579         { CLASSPORTINFO_REC_FIELD(redirect_tcslfl),
 580           .offset_words = 6,
 581           .offset_bits  = 0,
 582           .size_bits    = 32 },
 583         { CLASSPORTINFO_REC_FIELD(redirect_lid),
 584           .offset_words = 7,
 585           .offset_bits  = 0,
 586           .size_bits    = 16 },
 587         { CLASSPORTINFO_REC_FIELD(redirect_pkey),
 588           .offset_words = 7,
 589           .offset_bits  = 16,
 590           .size_bits    = 16 },
 591
 592         { CLASSPORTINFO_REC_FIELD(redirect_qp),
 593           .offset_words = 8,
 594           .offset_bits  = 0,
 595           .size_bits    = 32 },
 596         { CLASSPORTINFO_REC_FIELD(redirect_qkey),
 597           .offset_words = 9,
 598           .offset_bits  = 0,
 599           .size_bits    = 32 },
 600
 601         { CLASSPORTINFO_REC_FIELD(trap_gid),
 602           .offset_words = 10,
 603           .offset_bits  = 0,
 604           .size_bits    = 128 },
 605         { CLASSPORTINFO_REC_FIELD(trap_tcslfl),
 606           .offset_words = 14,
 607           .offset_bits  = 0,
 608           .size_bits    = 32 },
 609
 610         { CLASSPORTINFO_REC_FIELD(trap_lid),
 611           .offset_words = 15,
 612           .offset_bits  = 0,
 613           .size_bits    = 16 },
 614         { CLASSPORTINFO_REC_FIELD(trap_pkey),
 615           .offset_words = 15,
 616           .offset_bits  = 16,
 617           .size_bits    = 16 },
 618
 619         { CLASSPORTINFO_REC_FIELD(trap_hlqp),
 620           .offset_words = 16,
 621           .offset_bits  = 0,
 622           .size_bits    = 32 },
 623         { CLASSPORTINFO_REC_FIELD(trap_qkey),
 624           .offset_words = 17,
 625           .offset_bits  = 0,
 626           .size_bits    = 32 },
 627 };
 628
 629 #define OPA_CLASSPORTINFO_REC_FIELD(field) \
 630         .struct_offset_bytes =\
 631                 offsetof(struct opa_class_port_info, field),    \
 632         .struct_size_bytes   = \
 633                 sizeof_field(struct opa_class_port_info, field),        \
 634         .field_name          = "opa_class_port_info:" #field
 635
 636 static const struct ib_field opa_classport_info_rec_table[] = {
 637         { OPA_CLASSPORTINFO_REC_FIELD(base_version),
 638           .offset_words = 0,
 639           .offset_bits  = 0,
 640           .size_bits    = 8 },
 641         { OPA_CLASSPORTINFO_REC_FIELD(class_version),
 642           .offset_words = 0,
 643           .offset_bits  = 8,
 644           .size_bits    = 8 },
 645         { OPA_CLASSPORTINFO_REC_FIELD(cap_mask),
 646           .offset_words = 0,
 647           .offset_bits  = 16,
 648           .size_bits    = 16 },
 649         { OPA_CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
 650           .offset_words = 1,
 651           .offset_bits  = 0,
 652           .size_bits    = 32 },
 653         { OPA_CLASSPORTINFO_REC_FIELD(redirect_gid),
 654           .offset_words = 2,
 655           .offset_bits  = 0,
 656           .size_bits    = 128 },
 657         { OPA_CLASSPORTINFO_REC_FIELD(redirect_tc_fl),
 658           .offset_words = 6,
 659           .offset_bits  = 0,
 660           .size_bits    = 32 },
 661         { OPA_CLASSPORTINFO_REC_FIELD(redirect_lid),
 662           .offset_words = 7,
 663           .offset_bits  = 0,
 664           .size_bits    = 32 },
 665         { OPA_CLASSPORTINFO_REC_FIELD(redirect_sl_qp),
 666           .offset_words = 8,
 667           .offset_bits  = 0,
 668           .size_bits    = 32 },
 669         { OPA_CLASSPORTINFO_REC_FIELD(redirect_qkey),
 670           .offset_words = 9,
 671           .offset_bits  = 0,
 672           .size_bits    = 32 },
 673         { OPA_CLASSPORTINFO_REC_FIELD(trap_gid),
 674           .offset_words = 10,
 675           .offset_bits  = 0,
 676           .size_bits    = 128 },
 677         { OPA_CLASSPORTINFO_REC_FIELD(trap_tc_fl),
 678           .offset_words = 14,
 679           .offset_bits  = 0,
 680           .size_bits    = 32 },
 681         { OPA_CLASSPORTINFO_REC_FIELD(trap_lid),
 682           .offset_words = 15,
 683           .offset_bits  = 0,
 684           .size_bits    = 32 },
 685         { OPA_CLASSPORTINFO_REC_FIELD(trap_hl_qp),
 686           .offset_words = 16,
 687           .offset_bits  = 0,
 688           .size_bits    = 32 },
 689         { OPA_CLASSPORTINFO_REC_FIELD(trap_qkey),
 690           .offset_words = 17,
 691           .offset_bits  = 0,
 692           .size_bits    = 32 },
 693         { OPA_CLASSPORTINFO_REC_FIELD(trap_pkey),
 694           .offset_words = 18,
 695           .offset_bits  = 0,
 696           .size_bits    = 16 },
 697         { OPA_CLASSPORTINFO_REC_FIELD(redirect_pkey),
 698           .offset_words = 18,
 699           .offset_bits  = 16,
 700           .size_bits    = 16 },
 701         { OPA_CLASSPORTINFO_REC_FIELD(trap_sl_rsvd),
 702           .offset_words = 19,
 703           .offset_bits  = 0,
 704           .size_bits    = 8 },
 705         { RESERVED,
 706           .offset_words = 19,
 707           .offset_bits  = 8,
 708           .size_bits    = 24 },
 709 };
 710
 711 #define GUIDINFO_REC_FIELD(field) \
 712         .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field),      \
 713         .struct_size_bytes   = sizeof_field(struct ib_sa_guidinfo_rec, field),  \
 714         .field_name          = "sa_guidinfo_rec:" #field
 715
 716 static const struct ib_field guidinfo_rec_table[] = {
 717         { GUIDINFO_REC_FIELD(lid),
 718           .offset_words = 0,
 719           .offset_bits  = 0,
 720           .size_bits    = 16 },
 721         { GUIDINFO_REC_FIELD(block_num),
 722           .offset_words = 0,
 723           .offset_bits  = 16,
 724           .size_bits    = 8 },
 725         { GUIDINFO_REC_FIELD(res1),
 726           .offset_words = 0,
 727           .offset_bits  = 24,
 728           .size_bits    = 8 },
 729         { GUIDINFO_REC_FIELD(res2),
 730           .offset_words = 1,
 731           .offset_bits  = 0,
 732           .size_bits    = 32 },
 733         { GUIDINFO_REC_FIELD(guid_info_list),
 734           .offset_words = 2,
 735           .offset_bits  = 0,
 736           .size_bits    = 512 },
 737 };
 738
 739 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
 740 {
 741         query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
 742 }
 743
 744 static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
 745 {
 746         return (query->flags & IB_SA_CANCEL);
 747 }
 748
 749 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
 750                                      struct ib_sa_query *query)
 751 {
 752         struct sa_path_rec *sa_rec = query->mad_buf->context[1];
 753         struct ib_sa_mad *mad = query->mad_buf->mad;
 754         ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
 755         u16 val16;
 756         u64 val64;
 757         struct rdma_ls_resolve_header *header;
 758
 759         query->mad_buf->context[1] = NULL;
 760
 761         /* Construct the family header first */
 762         header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 763         memcpy(header->device_name, dev_name(&query->port->agent->device->dev),
 764                LS_DEVICE_NAME_MAX);
 765         header->port_num = query->port->port_num;
 766
 767         if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
 768             sa_rec->reversible != 0)
 769                 query->path_use = LS_RESOLVE_PATH_USE_GMP;
 770         else
 771                 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
 772         header->path_use = query->path_use;
 773
 774         /* Now build the attributes */
 775         if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
 776                 val64 = be64_to_cpu(sa_rec->service_id);
 777                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
 778                         sizeof(val64), &val64);
 779         }
 780         if (comp_mask & IB_SA_PATH_REC_DGID)
 781                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
 782                         sizeof(sa_rec->dgid), &sa_rec->dgid);
 783         if (comp_mask & IB_SA_PATH_REC_SGID)
 784                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
 785                         sizeof(sa_rec->sgid), &sa_rec->sgid);
 786         if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
 787                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
 788                         sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
 789
 790         if (comp_mask & IB_SA_PATH_REC_PKEY) {
 791                 val16 = be16_to_cpu(sa_rec->pkey);
 792                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
 793                         sizeof(val16), &val16);
 794         }
 795         if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
 796                 val16 = be16_to_cpu(sa_rec->qos_class);
 797                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
 798                         sizeof(val16), &val16);
 799         }
 800 }
 801
 802 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
 803 {
 804         int len = 0;
 805
 806         if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
 807                 len += nla_total_size(sizeof(u64));
 808         if (comp_mask & IB_SA_PATH_REC_DGID)
 809                 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
 810         if (comp_mask & IB_SA_PATH_REC_SGID)
 811                 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
 812         if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
 813                 len += nla_total_size(sizeof(u8));
 814         if (comp_mask & IB_SA_PATH_REC_PKEY)
 815                 len += nla_total_size(sizeof(u16));
 816         if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
 817                 len += nla_total_size(sizeof(u16));
 818
 819         /*
 820          * Make sure that at least some of the required comp_mask bits are
 821          * set.
 822          */
 823         if (WARN_ON(len == 0))
 824                 return len;
 825
 826         /* Add the family header */
 827         len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
 828
 829         return len;
 830 }
 831
 832 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
 833 {
 834         struct sk_buff *skb = NULL;
 835         struct nlmsghdr *nlh;
 836         void *data;
 837         struct ib_sa_mad *mad;
 838         int len;
 839         unsigned long flags;
 840         unsigned long delay;
 841         gfp_t gfp_flag;
 842         int ret;
 843
 844         INIT_LIST_HEAD(&query->list);
 845         query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
 846
 847         mad = query->mad_buf->mad;
 848         len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
 849         if (len <= 0)
 850                 return -EMSGSIZE;
 851
 852         skb = nlmsg_new(len, gfp_mask);
 853         if (!skb)
 854                 return -ENOMEM;
 855
 856         /* Put nlmsg header only for now */
 857         data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
 858                             RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
 859         if (!data) {
 860                 nlmsg_free(skb);
 861                 return -EMSGSIZE;
 862         }
 863
 864         /* Add attributes */
 865         ib_nl_set_path_rec_attrs(skb, query);
 866
 867         /* Repair the nlmsg header length */
 868         nlmsg_end(skb, nlh);
 869
 870         gfp_flag = ((gfp_mask & GFP_ATOMIC) == GFP_ATOMIC) ? GFP_ATOMIC :
 871                 GFP_NOWAIT;
 872
 873         spin_lock_irqsave(&ib_nl_request_lock, flags);
 874         ret = rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, gfp_flag);
 875
 876         if (ret)
 877                 goto out;
 878
 879         /* Put the request on the list.*/
 880         delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
 881         query->timeout = delay + jiffies;
 882         list_add_tail(&query->list, &ib_nl_request_list);
 883         /* Start the timeout if this is the only request */
 884         if (ib_nl_request_list.next == &query->list)
 885                 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
 886
 887 out:
 888         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 889
 890         return ret;
 891 }
 892
 893 static int ib_nl_cancel_request(struct ib_sa_query *query)
 894 {
 895         unsigned long flags;
 896         struct ib_sa_query *wait_query;
 897         int found = 0;
 898
 899         spin_lock_irqsave(&ib_nl_request_lock, flags);
 900         list_for_each_entry(wait_query, &ib_nl_request_list, list) {
 901                 /* Let the timeout to take care of the callback */
 902                 if (query == wait_query) {
 903                         query->flags |= IB_SA_CANCEL;
 904                         query->timeout = jiffies;
 905                         list_move(&query->list, &ib_nl_request_list);
 906                         found = 1;
 907                         mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
 908                         break;
 909                 }
 910         }
 911         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 912
 913         return found;
 914 }
 915
 916 static void send_handler(struct ib_mad_agent *agent,
 917                          struct ib_mad_send_wc *mad_send_wc);
 918
 919 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
 920                                            const struct nlmsghdr *nlh)
 921 {
 922         struct ib_mad_send_wc mad_send_wc;
 923         struct ib_sa_mad *mad = NULL;
 924         const struct nlattr *head, *curr;
 925         struct ib_path_rec_data  *rec;
 926         int len, rem;
 927         u32 mask = 0;
 928         int status = -EIO;
 929
 930         if (query->callback) {
 931                 head = (const struct nlattr *) nlmsg_data(nlh);
 932                 len = nlmsg_len(nlh);
 933                 switch (query->path_use) {
 934                 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
 935                         mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
 936                         break;
 937
 938                 case LS_RESOLVE_PATH_USE_ALL:
 939                 case LS_RESOLVE_PATH_USE_GMP:
 940                 default:
 941                         mask = IB_PATH_PRIMARY | IB_PATH_GMP |
 942                                 IB_PATH_BIDIRECTIONAL;
 943                         break;
 944                 }
 945                 nla_for_each_attr(curr, head, len, rem) {
 946                         if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
 947                                 rec = nla_data(curr);
 948                                 /*
 949                                  * Get the first one. In the future, we may
 950                                  * need to get up to 6 pathrecords.
 951                                  */
 952                                 if ((rec->flags & mask) == mask) {
 953                                         mad = query->mad_buf->mad;
 954                                         mad->mad_hdr.method |=
 955                                                 IB_MGMT_METHOD_RESP;
 956                                         memcpy(mad->data, rec->path_rec,
 957                                                sizeof(rec->path_rec));
 958                                         status = 0;
 959                                         break;
 960                                 }
 961                         }
 962                 }
 963                 query->callback(query, status, mad);
 964         }
 965
 966         mad_send_wc.send_buf = query->mad_buf;
 967         mad_send_wc.status = IB_WC_SUCCESS;
 968         send_handler(query->mad_buf->mad_agent, &mad_send_wc);
 969 }
 970
 971 static void ib_nl_request_timeout(struct work_struct *work)
 972 {
 973         unsigned long flags;
 974         struct ib_sa_query *query;
 975         unsigned long delay;
 976         struct ib_mad_send_wc mad_send_wc;
 977         int ret;
 978
 979         spin_lock_irqsave(&ib_nl_request_lock, flags);
 980         while (!list_empty(&ib_nl_request_list)) {
 981                 query = list_entry(ib_nl_request_list.next,
 982                                    struct ib_sa_query, list);
 983
 984                 if (time_after(query->timeout, jiffies)) {
 985                         delay = query->timeout - jiffies;
 986                         if ((long)delay <= 0)
 987                                 delay = 1;
 988                         queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
 989                         break;
 990                 }
 991
 992                 list_del(&query->list);
 993                 ib_sa_disable_local_svc(query);
 994                 /* Hold the lock to protect against query cancellation */
 995                 if (ib_sa_query_cancelled(query))
 996                         ret = -1;
 997                 else
 998                         ret = ib_post_send_mad(query->mad_buf, NULL);
 999                 if (ret) {
1000                         mad_send_wc.send_buf = query->mad_buf;
1001                         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
1002                         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1003                         send_handler(query->port->agent, &mad_send_wc);
1004                         spin_lock_irqsave(&ib_nl_request_lock, flags);
1005                 }
1006         }
1007         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1008 }
1009
1010 int ib_nl_handle_set_timeout(struct sk_buff *skb,
1011                              struct nlmsghdr *nlh,
1012                              struct netlink_ext_ack *extack)
1013 {
1014         int timeout, delta, abs_delta;
1015         const struct nlattr *attr;
1016         unsigned long flags;
1017         struct ib_sa_query *query;
1018         long delay = 0;
1019         struct nlattr *tb[LS_NLA_TYPE_MAX];
1020         int ret;
1021
1022         if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
1023             !(NETLINK_CB(skb).sk))
1024                 return -EPERM;
1025
1026         ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
1027                                    nlmsg_len(nlh), ib_nl_policy, NULL);
1028         attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
1029         if (ret || !attr)
1030                 goto settimeout_out;
1031
1032         timeout = *(int *) nla_data(attr);
1033         if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
1034                 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
1035         if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
1036                 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
1037
1038         delta = timeout - sa_local_svc_timeout_ms;
1039         if (delta < 0)
1040                 abs_delta = -delta;
1041         else
1042                 abs_delta = delta;
1043
1044         if (delta != 0) {
1045                 spin_lock_irqsave(&ib_nl_request_lock, flags);
1046                 sa_local_svc_timeout_ms = timeout;
1047                 list_for_each_entry(query, &ib_nl_request_list, list) {
1048                         if (delta < 0 && abs_delta > query->timeout)
1049                                 query->timeout = 0;
1050                         else
1051                                 query->timeout += delta;
1052
1053                         /* Get the new delay from the first entry */
1054                         if (!delay) {
1055                                 delay = query->timeout - jiffies;
1056                                 if (delay <= 0)
1057                                         delay = 1;
1058                         }
1059                 }
1060                 if (delay)
1061                         mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
1062                                          (unsigned long)delay);
1063                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1064         }
1065
1066 settimeout_out:
1067         return 0;
1068 }
1069
1070 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
1071 {
1072         struct nlattr *tb[LS_NLA_TYPE_MAX];
1073         int ret;
1074
1075         if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
1076                 return 0;
1077
1078         ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
1079                                    nlmsg_len(nlh), ib_nl_policy, NULL);
1080         if (ret)
1081                 return 0;
1082
1083         return 1;
1084 }
1085
1086 int ib_nl_handle_resolve_resp(struct sk_buff *skb,
1087                               struct nlmsghdr *nlh,
1088                               struct netlink_ext_ack *extack)
1089 {
1090         unsigned long flags;
1091         struct ib_sa_query *query;
1092         struct ib_mad_send_buf *send_buf;
1093         struct ib_mad_send_wc mad_send_wc;
1094         int found = 0;
1095         int ret;
1096
1097         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
1098             !(NETLINK_CB(skb).sk))
1099                 return -EPERM;
1100
1101         spin_lock_irqsave(&ib_nl_request_lock, flags);
1102         list_for_each_entry(query, &ib_nl_request_list, list) {
1103                 /*
1104                  * If the query is cancelled, let the timeout routine
1105                  * take care of it.
1106                  */
1107                 if (nlh->nlmsg_seq == query->seq) {
1108                         found = !ib_sa_query_cancelled(query);
1109                         if (found)
1110                                 list_del(&query->list);
1111                         break;
1112                 }
1113         }
1114
1115         if (!found) {
1116                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1117                 goto resp_out;
1118         }
1119
1120         send_buf = query->mad_buf;
1121
1122         if (!ib_nl_is_good_resolve_resp(nlh)) {
1123                 /* if the result is a failure, send out the packet via IB */
1124                 ib_sa_disable_local_svc(query);
1125                 ret = ib_post_send_mad(query->mad_buf, NULL);
1126                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1127                 if (ret) {
1128                         mad_send_wc.send_buf = send_buf;
1129                         mad_send_wc.status = IB_WC_GENERAL_ERR;
1130                         send_handler(query->port->agent, &mad_send_wc);
1131                 }
1132         } else {
1133                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1134                 ib_nl_process_good_resolve_rsp(query, nlh);
1135         }
1136
1137 resp_out:
1138         return 0;
1139 }
1140
1141 static void free_sm_ah(struct kref *kref)
1142 {
1143         struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
1144
1145         rdma_destroy_ah(sm_ah->ah, 0);
1146         kfree(sm_ah);
1147 }
1148
1149 void ib_sa_register_client(struct ib_sa_client *client)
1150 {
1151         atomic_set(&client->users, 1);
1152         init_completion(&client->comp);
1153 }
1154 EXPORT_SYMBOL(ib_sa_register_client);
1155
1156 void ib_sa_unregister_client(struct ib_sa_client *client)
1157 {
1158         ib_sa_client_put(client);
1159         wait_for_completion(&client->comp);
1160 }
1161 EXPORT_SYMBOL(ib_sa_unregister_client);
1162
1163 /**
1164  * ib_sa_cancel_query - try to cancel an SA query
1165  * @id:ID of query to cancel
1166  * @query:query pointer to cancel
1167  *
1168  * Try to cancel an SA query.  If the id and query don't match up or
1169  * the query has already completed, nothing is done.  Otherwise the
1170  * query is canceled and will complete with a status of -EINTR.
1171  */
1172 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
1173 {
1174         unsigned long flags;
1175         struct ib_mad_send_buf *mad_buf;
1176
1177         xa_lock_irqsave(&queries, flags);
1178         if (xa_load(&queries, id) != query) {
1179                 xa_unlock_irqrestore(&queries, flags);
1180                 return;
1181         }
1182         mad_buf = query->mad_buf;
1183         xa_unlock_irqrestore(&queries, flags);
1184
1185         /*
1186          * If the query is still on the netlink request list, schedule
1187          * it to be cancelled by the timeout routine. Otherwise, it has been
1188          * sent to the MAD layer and has to be cancelled from there.
1189          */
1190         if (!ib_nl_cancel_request(query))
1191                 ib_cancel_mad(mad_buf);
1192 }
1193 EXPORT_SYMBOL(ib_sa_cancel_query);
1194
1195 static u8 get_src_path_mask(struct ib_device *device, u32 port_num)
1196 {
1197         struct ib_sa_device *sa_dev;
1198         struct ib_sa_port   *port;
1199         unsigned long flags;
1200         u8 src_path_mask;
1201
1202         sa_dev = ib_get_client_data(device, &sa_client);
1203         if (!sa_dev)
1204                 return 0x7f;
1205
1206         port  = &sa_dev->port[port_num - sa_dev->start_port];
1207         spin_lock_irqsave(&port->ah_lock, flags);
1208         src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
1209         spin_unlock_irqrestore(&port->ah_lock, flags);
1210
1211         return src_path_mask;
1212 }
1213
1214 static int init_ah_attr_grh_fields(struct ib_device *device, u32 port_num,
1215                                    struct sa_path_rec *rec,
1216                                    struct rdma_ah_attr *ah_attr,
1217                                    const struct ib_gid_attr *gid_attr)
1218 {
1219         enum ib_gid_type type = sa_conv_pathrec_to_gid_type(rec);
1220
1221         if (!gid_attr) {
1222                 gid_attr = rdma_find_gid_by_port(device, &rec->sgid, type,
1223                                                  port_num, NULL);
1224                 if (IS_ERR(gid_attr))
1225                         return PTR_ERR(gid_attr);
1226         } else
1227                 rdma_hold_gid_attr(gid_attr);
1228
1229         rdma_move_grh_sgid_attr(ah_attr, &rec->dgid,
1230                                 be32_to_cpu(rec->flow_label),
1231                                 rec->hop_limit, rec->traffic_class,
1232                                 gid_attr);
1233         return 0;
1234 }
1235
1236 /**
1237  * ib_init_ah_attr_from_path - Initialize address handle attributes based on
1238  *   an SA path record.
1239  * @device: Device associated ah attributes initialization.
1240  * @port_num: Port on the specified device.
1241  * @rec: path record entry to use for ah attributes initialization.
1242  * @ah_attr: address handle attributes to initialization from path record.
1243  * @gid_attr: SGID attribute to consider during initialization.
1244  *
1245  * When ib_init_ah_attr_from_path() returns success,
1246  * (a) for IB link layer it optionally contains a reference to SGID attribute
1247  * when GRH is present for IB link layer.
1248  * (b) for RoCE link layer it contains a reference to SGID attribute.
1249  * User must invoke rdma_destroy_ah_attr() to release reference to SGID
1250  * attributes which are initialized using ib_init_ah_attr_from_path().
1251  */
1252 int ib_init_ah_attr_from_path(struct ib_device *device, u32 port_num,
1253                               struct sa_path_rec *rec,
1254                               struct rdma_ah_attr *ah_attr,
1255                               const struct ib_gid_attr *gid_attr)
1256 {
1257         int ret = 0;
1258
1259         memset(ah_attr, 0, sizeof(*ah_attr));
1260         ah_attr->type = rdma_ah_find_type(device, port_num);
1261         rdma_ah_set_sl(ah_attr, rec->sl);
1262         rdma_ah_set_port_num(ah_attr, port_num);
1263         rdma_ah_set_static_rate(ah_attr, rec->rate);
1264
1265         if (sa_path_is_roce(rec)) {
1266                 ret = roce_resolve_route_from_path(rec, gid_attr);
1267                 if (ret)
1268                         return ret;
1269
1270                 memcpy(ah_attr->roce.dmac, sa_path_get_dmac(rec), ETH_ALEN);
1271         } else {
1272                 rdma_ah_set_dlid(ah_attr, be32_to_cpu(sa_path_get_dlid(rec)));
1273                 if (sa_path_is_opa(rec) &&
1274                     rdma_ah_get_dlid(ah_attr) == be16_to_cpu(IB_LID_PERMISSIVE))
1275                         rdma_ah_set_make_grd(ah_attr, true);
1276
1277                 rdma_ah_set_path_bits(ah_attr,
1278                                       be32_to_cpu(sa_path_get_slid(rec)) &
1279                                       get_src_path_mask(device, port_num));
1280         }
1281
1282         if (rec->hop_limit > 0 || sa_path_is_roce(rec))
1283                 ret = init_ah_attr_grh_fields(device, port_num,
1284                                               rec, ah_attr, gid_attr);
1285         return ret;
1286 }
1287 EXPORT_SYMBOL(ib_init_ah_attr_from_path);
1288
1289 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1290 {
1291         struct rdma_ah_attr ah_attr;
1292         unsigned long flags;
1293
1294         spin_lock_irqsave(&query->port->ah_lock, flags);
1295         if (!query->port->sm_ah) {
1296                 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1297                 return -EAGAIN;
1298         }
1299         kref_get(&query->port->sm_ah->ref);
1300         query->sm_ah = query->port->sm_ah;
1301         spin_unlock_irqrestore(&query->port->ah_lock, flags);
1302
1303         /*
1304          * Always check if sm_ah has valid dlid assigned,
1305          * before querying for class port info
1306          */
1307         if ((rdma_query_ah(query->sm_ah->ah, &ah_attr) < 0) ||
1308             !rdma_is_valid_unicast_lid(&ah_attr)) {
1309                 kref_put(&query->sm_ah->ref, free_sm_ah);
1310                 return -EAGAIN;
1311         }
1312         query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1313                                             query->sm_ah->pkey_index,
1314                                             0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1315                                             gfp_mask,
1316                                             ((query->flags & IB_SA_QUERY_OPA) ?
1317                                              OPA_MGMT_BASE_VERSION :
1318                                              IB_MGMT_BASE_VERSION));
1319         if (IS_ERR(query->mad_buf)) {
1320                 kref_put(&query->sm_ah->ref, free_sm_ah);
1321                 return -ENOMEM;
1322         }
1323
1324         query->mad_buf->ah = query->sm_ah->ah;
1325
1326         return 0;
1327 }
1328
1329 static void free_mad(struct ib_sa_query *query)
1330 {
1331         ib_free_send_mad(query->mad_buf);
1332         kref_put(&query->sm_ah->ref, free_sm_ah);
1333 }
1334
1335 static void init_mad(struct ib_sa_query *query, struct ib_mad_agent *agent)
1336 {
1337         struct ib_sa_mad *mad = query->mad_buf->mad;
1338         unsigned long flags;
1339
1340         memset(mad, 0, sizeof *mad);
1341
1342         if (query->flags & IB_SA_QUERY_OPA) {
1343                 mad->mad_hdr.base_version  = OPA_MGMT_BASE_VERSION;
1344                 mad->mad_hdr.class_version = OPA_SA_CLASS_VERSION;
1345         } else {
1346                 mad->mad_hdr.base_version  = IB_MGMT_BASE_VERSION;
1347                 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1348         }
1349         mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_SUBN_ADM;
1350         spin_lock_irqsave(&tid_lock, flags);
1351         mad->mad_hdr.tid           =
1352                 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1353         spin_unlock_irqrestore(&tid_lock, flags);
1354 }
1355
1356 static int send_mad(struct ib_sa_query *query, unsigned long timeout_ms,
1357                     gfp_t gfp_mask)
1358 {
1359         unsigned long flags;
1360         int ret, id;
1361
1362         xa_lock_irqsave(&queries, flags);
1363         ret = __xa_alloc(&queries, &id, query, xa_limit_32b, gfp_mask);
1364         xa_unlock_irqrestore(&queries, flags);
1365         if (ret < 0)
1366                 return ret;
1367
1368         query->mad_buf->timeout_ms  = timeout_ms;
1369         query->mad_buf->context[0] = query;
1370         query->id = id;
1371
1372         if ((query->flags & IB_SA_ENABLE_LOCAL_SERVICE) &&
1373             (!(query->flags & IB_SA_QUERY_OPA))) {
1374                 if (rdma_nl_chk_listeners(RDMA_NL_GROUP_LS)) {
1375                         if (!ib_nl_make_request(query, gfp_mask))
1376                                 return id;
1377                 }
1378                 ib_sa_disable_local_svc(query);
1379         }
1380
1381         ret = ib_post_send_mad(query->mad_buf, NULL);
1382         if (ret) {
1383                 xa_lock_irqsave(&queries, flags);
1384                 __xa_erase(&queries, id);
1385                 xa_unlock_irqrestore(&queries, flags);
1386         }
1387
1388         /*
1389          * It's not safe to dereference query any more, because the
1390          * send may already have completed and freed the query in
1391          * another context.
1392          */
1393         return ret ? ret : id;
1394 }
1395
1396 void ib_sa_unpack_path(void *attribute, struct sa_path_rec *rec)
1397 {
1398         ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1399 }
1400 EXPORT_SYMBOL(ib_sa_unpack_path);
1401
1402 void ib_sa_pack_path(struct sa_path_rec *rec, void *attribute)
1403 {
1404         ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1405 }
1406 EXPORT_SYMBOL(ib_sa_pack_path);
1407
1408 static bool ib_sa_opa_pathrecord_support(struct ib_sa_client *client,
1409                                          struct ib_sa_device *sa_dev,
1410                                          u32 port_num)
1411 {
1412         struct ib_sa_port *port;
1413         unsigned long flags;
1414         bool ret = false;
1415
1416         port = &sa_dev->port[port_num - sa_dev->start_port];
1417         spin_lock_irqsave(&port->classport_lock, flags);
1418         if (!port->classport_info.valid)
1419                 goto ret;
1420
1421         if (port->classport_info.data.type == RDMA_CLASS_PORT_INFO_OPA)
1422                 ret = opa_get_cpi_capmask2(&port->classport_info.data.opa) &
1423                         OPA_CLASS_PORT_INFO_PR_SUPPORT;
1424 ret:
1425         spin_unlock_irqrestore(&port->classport_lock, flags);
1426         return ret;
1427 }
1428
1429 enum opa_pr_supported {
1430         PR_NOT_SUPPORTED,
1431         PR_OPA_SUPPORTED,
1432         PR_IB_SUPPORTED
1433 };
1434
1435 /*
1436  * opa_pr_query_possible - Check if current PR query can be an OPA query.
1437  *
1438  * Retuns PR_NOT_SUPPORTED if a path record query is not
1439  * possible, PR_OPA_SUPPORTED if an OPA path record query
1440  * is possible and PR_IB_SUPPORTED if an IB path record
1441  * query is possible.
1442  */
1443 static int opa_pr_query_possible(struct ib_sa_client *client,
1444                                  struct ib_sa_device *sa_dev,
1445                                  struct ib_device *device, u32 port_num)
1446 {
1447         struct ib_port_attr port_attr;
1448
1449         if (ib_query_port(device, port_num, &port_attr))
1450                 return PR_NOT_SUPPORTED;
1451
1452         if (ib_sa_opa_pathrecord_support(client, sa_dev, port_num))
1453                 return PR_OPA_SUPPORTED;
1454
1455         if (port_attr.lid >= be16_to_cpu(IB_MULTICAST_LID_BASE))
1456                 return PR_NOT_SUPPORTED;
1457         else
1458                 return PR_IB_SUPPORTED;
1459 }
1460
1461 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1462                                     int status,
1463                                     struct ib_sa_mad *mad)
1464 {
1465         struct ib_sa_path_query *query =
1466                 container_of(sa_query, struct ib_sa_path_query, sa_query);
1467
1468         if (mad) {
1469                 struct sa_path_rec rec;
1470
1471                 if (sa_query->flags & IB_SA_QUERY_OPA) {
1472                         ib_unpack(opa_path_rec_table,
1473                                   ARRAY_SIZE(opa_path_rec_table),
1474                                   mad->data, &rec);
1475                         rec.rec_type = SA_PATH_REC_TYPE_OPA;
1476                         query->callback(status, &rec, query->context);
1477                 } else {
1478                         ib_unpack(path_rec_table,
1479                                   ARRAY_SIZE(path_rec_table),
1480                                   mad->data, &rec);
1481                         rec.rec_type = SA_PATH_REC_TYPE_IB;
1482                         sa_path_set_dmac_zero(&rec);
1483
1484                         if (query->conv_pr) {
1485                                 struct sa_path_rec opa;
1486
1487                                 memset(&opa, 0, sizeof(struct sa_path_rec));
1488                                 sa_convert_path_ib_to_opa(&opa, &rec);
1489                                 query->callback(status, &opa, query->context);
1490                         } else {
1491                                 query->callback(status, &rec, query->context);
1492                         }
1493                 }
1494         } else
1495                 query->callback(status, NULL, query->context);
1496 }
1497
1498 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1499 {
1500         struct ib_sa_path_query *query =
1501                 container_of(sa_query, struct ib_sa_path_query, sa_query);
1502
1503         kfree(query->conv_pr);
1504         kfree(query);
1505 }
1506
1507 /**
1508  * ib_sa_path_rec_get - Start a Path get query
1509  * @client:SA client
1510  * @device:device to send query on
1511  * @port_num: port number to send query on
1512  * @rec:Path Record to send in query
1513  * @comp_mask:component mask to send in query
1514  * @timeout_ms:time to wait for response
1515  * @gfp_mask:GFP mask to use for internal allocations
1516  * @callback:function called when query completes, times out or is
1517  * canceled
1518  * @context:opaque user context passed to callback
1519  * @sa_query:query context, used to cancel query
1520  *
1521  * Send a Path Record Get query to the SA to look up a path.  The
1522  * callback function will be called when the query completes (or
1523  * fails); status is 0 for a successful response, -EINTR if the query
1524  * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1525  * occurred sending the query.  The resp parameter of the callback is
1526  * only valid if status is 0.
1527  *
1528  * If the return value of ib_sa_path_rec_get() is negative, it is an
1529  * error code.  Otherwise it is a query ID that can be used to cancel
1530  * the query.
1531  */
1532 int ib_sa_path_rec_get(struct ib_sa_client *client,
1533                        struct ib_device *device, u32 port_num,
1534                        struct sa_path_rec *rec,
1535                        ib_sa_comp_mask comp_mask,
1536                        unsigned long timeout_ms, gfp_t gfp_mask,
1537                        void (*callback)(int status,
1538                                         struct sa_path_rec *resp,
1539                                         void *context),
1540                        void *context,
1541                        struct ib_sa_query **sa_query)
1542 {
1543         struct ib_sa_path_query *query;
1544         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1545         struct ib_sa_port   *port;
1546         struct ib_mad_agent *agent;
1547         struct ib_sa_mad *mad;
1548         enum opa_pr_supported status;
1549         int ret;
1550
1551         if (!sa_dev)
1552                 return -ENODEV;
1553
1554         if ((rec->rec_type != SA_PATH_REC_TYPE_IB) &&
1555             (rec->rec_type != SA_PATH_REC_TYPE_OPA))
1556                 return -EINVAL;
1557
1558         port  = &sa_dev->port[port_num - sa_dev->start_port];
1559         agent = port->agent;
1560
1561         query = kzalloc(sizeof(*query), gfp_mask);
1562         if (!query)
1563                 return -ENOMEM;
1564
1565         query->sa_query.port     = port;
1566         if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
1567                 status = opa_pr_query_possible(client, sa_dev, device, port_num);
1568                 if (status == PR_NOT_SUPPORTED) {
1569                         ret = -EINVAL;
1570                         goto err1;
1571                 } else if (status == PR_OPA_SUPPORTED) {
1572                         query->sa_query.flags |= IB_SA_QUERY_OPA;
1573                 } else {
1574                         query->conv_pr =
1575                                 kmalloc(sizeof(*query->conv_pr), gfp_mask);
1576                         if (!query->conv_pr) {
1577                                 ret = -ENOMEM;
1578                                 goto err1;
1579                         }
1580                 }
1581         }
1582
1583         ret = alloc_mad(&query->sa_query, gfp_mask);
1584         if (ret)
1585                 goto err2;
1586
1587         ib_sa_client_get(client);
1588         query->sa_query.client = client;
1589         query->callback        = callback;
1590         query->context         = context;
1591
1592         mad = query->sa_query.mad_buf->mad;
1593         init_mad(&query->sa_query, agent);
1594
1595         query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1596         query->sa_query.release  = ib_sa_path_rec_release;
1597         mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
1598         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1599         mad->sa_hdr.comp_mask    = comp_mask;
1600
1601         if (query->sa_query.flags & IB_SA_QUERY_OPA) {
1602                 ib_pack(opa_path_rec_table, ARRAY_SIZE(opa_path_rec_table),
1603                         rec, mad->data);
1604         } else if (query->conv_pr) {
1605                 sa_convert_path_opa_to_ib(query->conv_pr, rec);
1606                 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
1607                         query->conv_pr, mad->data);
1608         } else {
1609                 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
1610                         rec, mad->data);
1611         }
1612
1613         *sa_query = &query->sa_query;
1614
1615         query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1616         query->sa_query.mad_buf->context[1] = (query->conv_pr) ?
1617                                                 query->conv_pr : rec;
1618
1619         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1620         if (ret < 0)
1621                 goto err3;
1622
1623         return ret;
1624
1625 err3:
1626         *sa_query = NULL;
1627         ib_sa_client_put(query->sa_query.client);
1628         free_mad(&query->sa_query);
1629 err2:
1630         kfree(query->conv_pr);
1631 err1:
1632         kfree(query);
1633         return ret;
1634 }
1635 EXPORT_SYMBOL(ib_sa_path_rec_get);
1636
1637 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1638                                     int status,
1639                                     struct ib_sa_mad *mad)
1640 {
1641         struct ib_sa_service_query *query =
1642                 container_of(sa_query, struct ib_sa_service_query, sa_query);
1643
1644         if (mad) {
1645                 struct ib_sa_service_rec rec;
1646
1647                 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1648                           mad->data, &rec);
1649                 query->callback(status, &rec, query->context);
1650         } else
1651                 query->callback(status, NULL, query->context);
1652 }
1653
1654 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1655 {
1656         kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1657 }
1658
1659 /**
1660  * ib_sa_service_rec_query - Start Service Record operation
1661  * @client:SA client
1662  * @device:device to send request on
1663  * @port_num: port number to send request on
1664  * @method:SA method - should be get, set, or delete
1665  * @rec:Service Record to send in request
1666  * @comp_mask:component mask to send in request
1667  * @timeout_ms:time to wait for response
1668  * @gfp_mask:GFP mask to use for internal allocations
1669  * @callback:function called when request completes, times out or is
1670  * canceled
1671  * @context:opaque user context passed to callback
1672  * @sa_query:request context, used to cancel request
1673  *
1674  * Send a Service Record set/get/delete to the SA to register,
1675  * unregister or query a service record.
1676  * The callback function will be called when the request completes (or
1677  * fails); status is 0 for a successful response, -EINTR if the query
1678  * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1679  * occurred sending the query.  The resp parameter of the callback is
1680  * only valid if status is 0.
1681  *
1682  * If the return value of ib_sa_service_rec_query() is negative, it is an
1683  * error code.  Otherwise it is a request ID that can be used to cancel
1684  * the query.
1685  */
1686 int ib_sa_service_rec_query(struct ib_sa_client *client,
1687                             struct ib_device *device, u32 port_num, u8 method,
1688                             struct ib_sa_service_rec *rec,
1689                             ib_sa_comp_mask comp_mask,
1690                             unsigned long timeout_ms, gfp_t gfp_mask,
1691                             void (*callback)(int status,
1692                                              struct ib_sa_service_rec *resp,
1693                                              void *context),
1694                             void *context,
1695                             struct ib_sa_query **sa_query)
1696 {
1697         struct ib_sa_service_query *query;
1698         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1699         struct ib_sa_port   *port;
1700         struct ib_mad_agent *agent;
1701         struct ib_sa_mad *mad;
1702         int ret;
1703
1704         if (!sa_dev)
1705                 return -ENODEV;
1706
1707         port  = &sa_dev->port[port_num - sa_dev->start_port];
1708         agent = port->agent;
1709
1710         if (method != IB_MGMT_METHOD_GET &&
1711             method != IB_MGMT_METHOD_SET &&
1712             method != IB_SA_METHOD_DELETE)
1713                 return -EINVAL;
1714
1715         query = kzalloc(sizeof(*query), gfp_mask);
1716         if (!query)
1717                 return -ENOMEM;
1718
1719         query->sa_query.port     = port;
1720         ret = alloc_mad(&query->sa_query, gfp_mask);
1721         if (ret)
1722                 goto err1;
1723
1724         ib_sa_client_get(client);
1725         query->sa_query.client = client;
1726         query->callback        = callback;
1727         query->context         = context;
1728
1729         mad = query->sa_query.mad_buf->mad;
1730         init_mad(&query->sa_query, agent);
1731
1732         query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1733         query->sa_query.release  = ib_sa_service_rec_release;
1734         mad->mad_hdr.method      = method;
1735         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1736         mad->sa_hdr.comp_mask    = comp_mask;
1737
1738         ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1739                 rec, mad->data);
1740
1741         *sa_query = &query->sa_query;
1742
1743         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1744         if (ret < 0)
1745                 goto err2;
1746
1747         return ret;
1748
1749 err2:
1750         *sa_query = NULL;
1751         ib_sa_client_put(query->sa_query.client);
1752         free_mad(&query->sa_query);
1753
1754 err1:
1755         kfree(query);
1756         return ret;
1757 }
1758 EXPORT_SYMBOL(ib_sa_service_rec_query);
1759
1760 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1761                                         int status,
1762                                         struct ib_sa_mad *mad)
1763 {
1764         struct ib_sa_mcmember_query *query =
1765                 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1766
1767         if (mad) {
1768                 struct ib_sa_mcmember_rec rec;
1769
1770                 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1771                           mad->data, &rec);
1772                 query->callback(status, &rec, query->context);
1773         } else
1774                 query->callback(status, NULL, query->context);
1775 }
1776
1777 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1778 {
1779         kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1780 }
1781
1782 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1783                              struct ib_device *device, u32 port_num,
1784                              u8 method,
1785                              struct ib_sa_mcmember_rec *rec,
1786                              ib_sa_comp_mask comp_mask,
1787                              unsigned long timeout_ms, gfp_t gfp_mask,
1788                              void (*callback)(int status,
1789                                               struct ib_sa_mcmember_rec *resp,
1790                                               void *context),
1791                              void *context,
1792                              struct ib_sa_query **sa_query)
1793 {
1794         struct ib_sa_mcmember_query *query;
1795         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1796         struct ib_sa_port   *port;
1797         struct ib_mad_agent *agent;
1798         struct ib_sa_mad *mad;
1799         int ret;
1800
1801         if (!sa_dev)
1802                 return -ENODEV;
1803
1804         port  = &sa_dev->port[port_num - sa_dev->start_port];
1805         agent = port->agent;
1806
1807         query = kzalloc(sizeof(*query), gfp_mask);
1808         if (!query)
1809                 return -ENOMEM;
1810
1811         query->sa_query.port     = port;
1812         ret = alloc_mad(&query->sa_query, gfp_mask);
1813         if (ret)
1814                 goto err1;
1815
1816         ib_sa_client_get(client);
1817         query->sa_query.client = client;
1818         query->callback        = callback;
1819         query->context         = context;
1820
1821         mad = query->sa_query.mad_buf->mad;
1822         init_mad(&query->sa_query, agent);
1823
1824         query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1825         query->sa_query.release  = ib_sa_mcmember_rec_release;
1826         mad->mad_hdr.method      = method;
1827         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1828         mad->sa_hdr.comp_mask    = comp_mask;
1829
1830         ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1831                 rec, mad->data);
1832
1833         *sa_query = &query->sa_query;
1834
1835         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1836         if (ret < 0)
1837                 goto err2;
1838
1839         return ret;
1840
1841 err2:
1842         *sa_query = NULL;
1843         ib_sa_client_put(query->sa_query.client);
1844         free_mad(&query->sa_query);
1845
1846 err1:
1847         kfree(query);
1848         return ret;
1849 }
1850
1851 /* Support GuidInfoRecord */
1852 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1853                                         int status,
1854                                         struct ib_sa_mad *mad)
1855 {
1856         struct ib_sa_guidinfo_query *query =
1857                 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1858
1859         if (mad) {
1860                 struct ib_sa_guidinfo_rec rec;
1861
1862                 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1863                           mad->data, &rec);
1864                 query->callback(status, &rec, query->context);
1865         } else
1866                 query->callback(status, NULL, query->context);
1867 }
1868
1869 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1870 {
1871         kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1872 }
1873
1874 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1875                               struct ib_device *device, u32 port_num,
1876                               struct ib_sa_guidinfo_rec *rec,
1877                               ib_sa_comp_mask comp_mask, u8 method,
1878                               unsigned long timeout_ms, gfp_t gfp_mask,
1879                               void (*callback)(int status,
1880                                                struct ib_sa_guidinfo_rec *resp,
1881                                                void *context),
1882                               void *context,
1883                               struct ib_sa_query **sa_query)
1884 {
1885         struct ib_sa_guidinfo_query *query;
1886         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1887         struct ib_sa_port *port;
1888         struct ib_mad_agent *agent;
1889         struct ib_sa_mad *mad;
1890         int ret;
1891
1892         if (!sa_dev)
1893                 return -ENODEV;
1894
1895         if (method != IB_MGMT_METHOD_GET &&
1896             method != IB_MGMT_METHOD_SET &&
1897             method != IB_SA_METHOD_DELETE) {
1898                 return -EINVAL;
1899         }
1900
1901         port  = &sa_dev->port[port_num - sa_dev->start_port];
1902         agent = port->agent;
1903
1904         query = kzalloc(sizeof(*query), gfp_mask);
1905         if (!query)
1906                 return -ENOMEM;
1907
1908         query->sa_query.port = port;
1909         ret = alloc_mad(&query->sa_query, gfp_mask);
1910         if (ret)
1911                 goto err1;
1912
1913         ib_sa_client_get(client);
1914         query->sa_query.client = client;
1915         query->callback        = callback;
1916         query->context         = context;
1917
1918         mad = query->sa_query.mad_buf->mad;
1919         init_mad(&query->sa_query, agent);
1920
1921         query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1922         query->sa_query.release  = ib_sa_guidinfo_rec_release;
1923
1924         mad->mad_hdr.method      = method;
1925         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1926         mad->sa_hdr.comp_mask    = comp_mask;
1927
1928         ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1929                 mad->data);
1930
1931         *sa_query = &query->sa_query;
1932
1933         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1934         if (ret < 0)
1935                 goto err2;
1936
1937         return ret;
1938
1939 err2:
1940         *sa_query = NULL;
1941         ib_sa_client_put(query->sa_query.client);
1942         free_mad(&query->sa_query);
1943
1944 err1:
1945         kfree(query);
1946         return ret;
1947 }
1948 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1949
1950 struct ib_classport_info_context {
1951         struct completion       done;
1952         struct ib_sa_query      *sa_query;
1953 };
1954
1955 static void ib_classportinfo_cb(void *context)
1956 {
1957         struct ib_classport_info_context *cb_ctx = context;
1958
1959         complete(&cb_ctx->done);
1960 }
1961
1962 static void ib_sa_classport_info_rec_callback(struct ib_sa_query *sa_query,
1963                                               int status,
1964                                               struct ib_sa_mad *mad)
1965 {
1966         unsigned long flags;
1967         struct ib_sa_classport_info_query *query =
1968                 container_of(sa_query, struct ib_sa_classport_info_query, sa_query);
1969         struct ib_sa_classport_cache *info = &sa_query->port->classport_info;
1970
1971         if (mad) {
1972                 if (sa_query->flags & IB_SA_QUERY_OPA) {
1973                         struct opa_class_port_info rec;
1974
1975                         ib_unpack(opa_classport_info_rec_table,
1976                                   ARRAY_SIZE(opa_classport_info_rec_table),
1977                                   mad->data, &rec);
1978
1979                         spin_lock_irqsave(&sa_query->port->classport_lock,
1980                                           flags);
1981                         if (!status && !info->valid) {
1982                                 memcpy(&info->data.opa, &rec,
1983                                        sizeof(info->data.opa));
1984
1985                                 info->valid = true;
1986                                 info->data.type = RDMA_CLASS_PORT_INFO_OPA;
1987                         }
1988                         spin_unlock_irqrestore(&sa_query->port->classport_lock,
1989                                                flags);
1990
1991                 } else {
1992                         struct ib_class_port_info rec;
1993
1994                         ib_unpack(ib_classport_info_rec_table,
1995                                   ARRAY_SIZE(ib_classport_info_rec_table),
1996                                   mad->data, &rec);
1997
1998                         spin_lock_irqsave(&sa_query->port->classport_lock,
1999                                           flags);
2000                         if (!status && !info->valid) {
2001                                 memcpy(&info->data.ib, &rec,
2002                                        sizeof(info->data.ib));
2003
2004                                 info->valid = true;
2005                                 info->data.type = RDMA_CLASS_PORT_INFO_IB;
2006                         }
2007                         spin_unlock_irqrestore(&sa_query->port->classport_lock,
2008                                                flags);
2009                 }
2010         }
2011         query->callback(query->context);
2012 }
2013
2014 static void ib_sa_classport_info_rec_release(struct ib_sa_query *sa_query)
2015 {
2016         kfree(container_of(sa_query, struct ib_sa_classport_info_query,
2017                            sa_query));
2018 }
2019
2020 static int ib_sa_classport_info_rec_query(struct ib_sa_port *port,
2021                                           unsigned long timeout_ms,
2022                                           void (*callback)(void *context),
2023                                           void *context,
2024                                           struct ib_sa_query **sa_query)
2025 {
2026         struct ib_mad_agent *agent;
2027         struct ib_sa_classport_info_query *query;
2028         struct ib_sa_mad *mad;
2029         gfp_t gfp_mask = GFP_KERNEL;
2030         int ret;
2031
2032         agent = port->agent;
2033
2034         query = kzalloc(sizeof(*query), gfp_mask);
2035         if (!query)
2036                 return -ENOMEM;
2037
2038         query->sa_query.port = port;
2039         query->sa_query.flags |= rdma_cap_opa_ah(port->agent->device,
2040                                                  port->port_num) ?
2041                                  IB_SA_QUERY_OPA : 0;
2042         ret = alloc_mad(&query->sa_query, gfp_mask);
2043         if (ret)
2044                 goto err_free;
2045
2046         query->callback = callback;
2047         query->context = context;
2048
2049         mad = query->sa_query.mad_buf->mad;
2050         init_mad(&query->sa_query, agent);
2051
2052         query->sa_query.callback = ib_sa_classport_info_rec_callback;
2053         query->sa_query.release  = ib_sa_classport_info_rec_release;
2054         mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
2055         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_CLASS_PORTINFO);
2056         mad->sa_hdr.comp_mask    = 0;
2057         *sa_query = &query->sa_query;
2058
2059         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
2060         if (ret < 0)
2061                 goto err_free_mad;
2062
2063         return ret;
2064
2065 err_free_mad:
2066         *sa_query = NULL;
2067         free_mad(&query->sa_query);
2068
2069 err_free:
2070         kfree(query);
2071         return ret;
2072 }
2073
2074 static void update_ib_cpi(struct work_struct *work)
2075 {
2076         struct ib_sa_port *port =
2077                 container_of(work, struct ib_sa_port, ib_cpi_work.work);
2078         struct ib_classport_info_context *cb_context;
2079         unsigned long flags;
2080         int ret;
2081
2082         /* If the classport info is valid, nothing
2083          * to do here.
2084          */
2085         spin_lock_irqsave(&port->classport_lock, flags);
2086         if (port->classport_info.valid) {
2087                 spin_unlock_irqrestore(&port->classport_lock, flags);
2088                 return;
2089         }
2090         spin_unlock_irqrestore(&port->classport_lock, flags);
2091
2092         cb_context = kmalloc(sizeof(*cb_context), GFP_KERNEL);
2093         if (!cb_context)
2094                 goto err_nomem;
2095
2096         init_completion(&cb_context->done);
2097
2098         ret = ib_sa_classport_info_rec_query(port, 3000,
2099                                              ib_classportinfo_cb, cb_context,
2100                                              &cb_context->sa_query);
2101         if (ret < 0)
2102                 goto free_cb_err;
2103         wait_for_completion(&cb_context->done);
2104 free_cb_err:
2105         kfree(cb_context);
2106         spin_lock_irqsave(&port->classport_lock, flags);
2107
2108         /* If the classport info is still not valid, the query should have
2109          * failed for some reason. Retry issuing the query
2110          */
2111         if (!port->classport_info.valid) {
2112                 port->classport_info.retry_cnt++;
2113                 if (port->classport_info.retry_cnt <=
2114                     IB_SA_CPI_MAX_RETRY_CNT) {
2115                         unsigned long delay =
2116                                 msecs_to_jiffies(IB_SA_CPI_RETRY_WAIT);
2117
2118                         queue_delayed_work(ib_wq, &port->ib_cpi_work, delay);
2119                 }
2120         }
2121         spin_unlock_irqrestore(&port->classport_lock, flags);
2122
2123 err_nomem:
2124         return;
2125 }
2126
2127 static void send_handler(struct ib_mad_agent *agent,
2128                          struct ib_mad_send_wc *mad_send_wc)
2129 {
2130         struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
2131         unsigned long flags;
2132
2133         if (query->callback)
2134                 switch (mad_send_wc->status) {
2135                 case IB_WC_SUCCESS:
2136                         /* No callback -- already got recv */
2137                         break;
2138                 case IB_WC_RESP_TIMEOUT_ERR:
2139                         query->callback(query, -ETIMEDOUT, NULL);
2140                         break;
2141                 case IB_WC_WR_FLUSH_ERR:
2142                         query->callback(query, -EINTR, NULL);
2143                         break;
2144                 default:
2145                         query->callback(query, -EIO, NULL);
2146                         break;
2147                 }
2148
2149         xa_lock_irqsave(&queries, flags);
2150         __xa_erase(&queries, query->id);
2151         xa_unlock_irqrestore(&queries, flags);
2152
2153         free_mad(query);
2154         if (query->client)
2155                 ib_sa_client_put(query->client);
2156         query->release(query);
2157 }
2158
2159 static void recv_handler(struct ib_mad_agent *mad_agent,
2160                          struct ib_mad_send_buf *send_buf,
2161                          struct ib_mad_recv_wc *mad_recv_wc)
2162 {
2163         struct ib_sa_query *query;
2164
2165         if (!send_buf)
2166                 return;
2167
2168         query = send_buf->context[0];
2169         if (query->callback) {
2170                 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
2171                         query->callback(query,
2172                                         mad_recv_wc->recv_buf.mad->mad_hdr.status ?
2173                                         -EINVAL : 0,
2174                                         (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
2175                 else
2176                         query->callback(query, -EIO, NULL);
2177         }
2178
2179         ib_free_recv_mad(mad_recv_wc);
2180 }
2181
2182 static void update_sm_ah(struct work_struct *work)
2183 {
2184         struct ib_sa_port *port =
2185                 container_of(work, struct ib_sa_port, update_task);
2186         struct ib_sa_sm_ah *new_ah;
2187         struct ib_port_attr port_attr;
2188         struct rdma_ah_attr   ah_attr;
2189         bool grh_required;
2190
2191         if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
2192                 pr_warn("Couldn't query port\n");
2193                 return;
2194         }
2195
2196         new_ah = kmalloc(sizeof(*new_ah), GFP_KERNEL);
2197         if (!new_ah)
2198                 return;
2199
2200         kref_init(&new_ah->ref);
2201         new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
2202
2203         new_ah->pkey_index = 0;
2204         if (ib_find_pkey(port->agent->device, port->port_num,
2205                          IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
2206                 pr_err("Couldn't find index for default PKey\n");
2207
2208         memset(&ah_attr, 0, sizeof(ah_attr));
2209         ah_attr.type = rdma_ah_find_type(port->agent->device,
2210                                          port->port_num);
2211         rdma_ah_set_dlid(&ah_attr, port_attr.sm_lid);
2212         rdma_ah_set_sl(&ah_attr, port_attr.sm_sl);
2213         rdma_ah_set_port_num(&ah_attr, port->port_num);
2214
2215         grh_required = rdma_is_grh_required(port->agent->device,
2216                                             port->port_num);
2217
2218         /*
2219          * The OPA sm_lid of 0xFFFF needs special handling so that it can be
2220          * differentiated from a permissive LID of 0xFFFF.  We set the
2221          * grh_required flag here so the SA can program the DGID in the
2222          * address handle appropriately
2223          */
2224         if (ah_attr.type == RDMA_AH_ATTR_TYPE_OPA &&
2225             (grh_required ||
2226              port_attr.sm_lid == be16_to_cpu(IB_LID_PERMISSIVE)))
2227                 rdma_ah_set_make_grd(&ah_attr, true);
2228
2229         if (ah_attr.type == RDMA_AH_ATTR_TYPE_IB && grh_required) {
2230                 rdma_ah_set_ah_flags(&ah_attr, IB_AH_GRH);
2231                 rdma_ah_set_subnet_prefix(&ah_attr,
2232                                           cpu_to_be64(port_attr.subnet_prefix));
2233                 rdma_ah_set_interface_id(&ah_attr,
2234                                          cpu_to_be64(IB_SA_WELL_KNOWN_GUID));
2235         }
2236
2237         new_ah->ah = rdma_create_ah(port->agent->qp->pd, &ah_attr,
2238                                     RDMA_CREATE_AH_SLEEPABLE);
2239         if (IS_ERR(new_ah->ah)) {
2240                 pr_warn("Couldn't create new SM AH\n");
2241                 kfree(new_ah);
2242                 return;
2243         }
2244
2245         spin_lock_irq(&port->ah_lock);
2246         if (port->sm_ah)
2247                 kref_put(&port->sm_ah->ref, free_sm_ah);
2248         port->sm_ah = new_ah;
2249         spin_unlock_irq(&port->ah_lock);
2250 }
2251
2252 static void ib_sa_event(struct ib_event_handler *handler,
2253                         struct ib_event *event)
2254 {
2255         if (event->event == IB_EVENT_PORT_ERR    ||
2256             event->event == IB_EVENT_PORT_ACTIVE ||
2257             event->event == IB_EVENT_LID_CHANGE  ||
2258             event->event == IB_EVENT_PKEY_CHANGE ||
2259             event->event == IB_EVENT_SM_CHANGE   ||
2260             event->event == IB_EVENT_CLIENT_REREGISTER) {
2261                 unsigned long flags;
2262                 struct ib_sa_device *sa_dev =
2263                         container_of(handler, typeof(*sa_dev), event_handler);
2264                 u32 port_num = event->element.port_num - sa_dev->start_port;
2265                 struct ib_sa_port *port = &sa_dev->port[port_num];
2266
2267                 if (!rdma_cap_ib_sa(handler->device, port->port_num))
2268                         return;
2269
2270                 spin_lock_irqsave(&port->ah_lock, flags);
2271                 if (port->sm_ah)
2272                         kref_put(&port->sm_ah->ref, free_sm_ah);
2273                 port->sm_ah = NULL;
2274                 spin_unlock_irqrestore(&port->ah_lock, flags);
2275
2276                 if (event->event == IB_EVENT_SM_CHANGE ||
2277                     event->event == IB_EVENT_CLIENT_REREGISTER ||
2278                     event->event == IB_EVENT_LID_CHANGE ||
2279                     event->event == IB_EVENT_PORT_ACTIVE) {
2280                         unsigned long delay =
2281                                 msecs_to_jiffies(IB_SA_CPI_RETRY_WAIT);
2282
2283                         spin_lock_irqsave(&port->classport_lock, flags);
2284                         port->classport_info.valid = false;
2285                         port->classport_info.retry_cnt = 0;
2286                         spin_unlock_irqrestore(&port->classport_lock, flags);
2287                         queue_delayed_work(ib_wq,
2288                                            &port->ib_cpi_work, delay);
2289                 }
2290                 queue_work(ib_wq, &sa_dev->port[port_num].update_task);
2291         }
2292 }
2293
2294 static int ib_sa_add_one(struct ib_device *device)
2295 {
2296         struct ib_sa_device *sa_dev;
2297         int s, e, i;
2298         int count = 0;
2299         int ret;
2300
2301         s = rdma_start_port(device);
2302         e = rdma_end_port(device);
2303
2304         sa_dev = kzalloc(struct_size(sa_dev, port, e - s + 1), GFP_KERNEL);
2305         if (!sa_dev)
2306                 return -ENOMEM;
2307
2308         sa_dev->start_port = s;
2309         sa_dev->end_port   = e;
2310
2311         for (i = 0; i <= e - s; ++i) {
2312                 spin_lock_init(&sa_dev->port[i].ah_lock);
2313                 if (!rdma_cap_ib_sa(device, i + 1))
2314                         continue;
2315
2316                 sa_dev->port[i].sm_ah    = NULL;
2317                 sa_dev->port[i].port_num = i + s;
2318
2319                 spin_lock_init(&sa_dev->port[i].classport_lock);
2320                 sa_dev->port[i].classport_info.valid = false;
2321
2322                 sa_dev->port[i].agent =
2323                         ib_register_mad_agent(device, i + s, IB_QPT_GSI,
2324                                               NULL, 0, send_handler,
2325                                               recv_handler, sa_dev, 0);
2326                 if (IS_ERR(sa_dev->port[i].agent)) {
2327                         ret = PTR_ERR(sa_dev->port[i].agent);
2328                         goto err;
2329                 }
2330
2331                 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
2332                 INIT_DELAYED_WORK(&sa_dev->port[i].ib_cpi_work,
2333                                   update_ib_cpi);
2334
2335                 count++;
2336         }
2337
2338         if (!count) {
2339                 ret = -EOPNOTSUPP;
2340                 goto free;
2341         }
2342
2343         ib_set_client_data(device, &sa_client, sa_dev);
2344
2345         /*
2346          * We register our event handler after everything is set up,
2347          * and then update our cached info after the event handler is
2348          * registered to avoid any problems if a port changes state
2349          * during our initialization.
2350          */
2351
2352         INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
2353         ib_register_event_handler(&sa_dev->event_handler);
2354
2355         for (i = 0; i <= e - s; ++i) {
2356                 if (rdma_cap_ib_sa(device, i + 1))
2357                         update_sm_ah(&sa_dev->port[i].update_task);
2358         }
2359
2360         return 0;
2361
2362 err:
2363         while (--i >= 0) {
2364                 if (rdma_cap_ib_sa(device, i + 1))
2365                         ib_unregister_mad_agent(sa_dev->port[i].agent);
2366         }
2367 free:
2368         kfree(sa_dev);
2369         return ret;
2370 }
2371
2372 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
2373 {
2374         struct ib_sa_device *sa_dev = client_data;
2375         int i;
2376
2377         ib_unregister_event_handler(&sa_dev->event_handler);
2378         flush_workqueue(ib_wq);
2379
2380         for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
2381                 if (rdma_cap_ib_sa(device, i + 1)) {
2382                         cancel_delayed_work_sync(&sa_dev->port[i].ib_cpi_work);
2383                         ib_unregister_mad_agent(sa_dev->port[i].agent);
2384                         if (sa_dev->port[i].sm_ah)
2385                                 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
2386                 }
2387
2388         }
2389
2390         kfree(sa_dev);
2391 }
2392
2393 int ib_sa_init(void)
2394 {
2395         int ret;
2396
2397         get_random_bytes(&tid, sizeof tid);
2398
2399         atomic_set(&ib_nl_sa_request_seq, 0);
2400
2401         ret = ib_register_client(&sa_client);
2402         if (ret) {
2403                 pr_err("Couldn't register ib_sa client\n");
2404                 goto err1;
2405         }
2406
2407         ret = mcast_init();
2408         if (ret) {
2409                 pr_err("Couldn't initialize multicast handling\n");
2410                 goto err2;
2411         }
2412
2413         ib_nl_wq = alloc_ordered_workqueue("ib_nl_sa_wq", WQ_MEM_RECLAIM);
2414         if (!ib_nl_wq) {
2415                 ret = -ENOMEM;
2416                 goto err3;
2417         }
2418
2419         INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
2420
2421         return 0;
2422
2423 err3:
2424         mcast_cleanup();
2425 err2:
2426         ib_unregister_client(&sa_client);
2427 err1:
2428         return ret;
2429 }
2430
2431 void ib_sa_cleanup(void)
2432 {
2433         cancel_delayed_work(&ib_nl_timed_work);
2434         flush_workqueue(ib_nl_wq);
2435         destroy_workqueue(ib_nl_wq);
2436         mcast_cleanup();
2437         ib_unregister_client(&sa_client);
2438         WARN_ON(!xa_empty(&queries));
2439 }