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/idr.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 "sa.h"
  54 #include "core_priv.h"
  55
  56 MODULE_AUTHOR("Roland Dreier");
  57 MODULE_DESCRIPTION("InfiniBand subnet administration query support");
  58 MODULE_LICENSE("Dual BSD/GPL");
  59
  60 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN             100
  61 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT         2000
  62 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX             200000
  63 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
  64
  65 struct ib_sa_sm_ah {
  66         struct ib_ah        *ah;
  67         struct kref          ref;
  68         u16                  pkey_index;
  69         u8                   src_path_mask;
  70 };
  71
  72 struct ib_sa_port {
  73         struct ib_mad_agent *agent;
  74         struct ib_sa_sm_ah  *sm_ah;
  75         struct work_struct   update_task;
  76         spinlock_t           ah_lock;
  77         u8                   port_num;
  78 };
  79
  80 struct ib_sa_device {
  81         int                     start_port, end_port;
  82         struct ib_event_handler event_handler;
  83         struct ib_sa_port port[0];
  84 };
  85
  86 struct ib_sa_query {
  87         void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
  88         void (*release)(struct ib_sa_query *);
  89         struct ib_sa_client    *client;
  90         struct ib_sa_port      *port;
  91         struct ib_mad_send_buf *mad_buf;
  92         struct ib_sa_sm_ah     *sm_ah;
  93         int                     id;
  94         u32                     flags;
  95         struct list_head        list; /* Local svc request list */
  96         u32                     seq; /* Local svc request sequence number */
  97         unsigned long           timeout; /* Local svc timeout */
  98         u8                      path_use; /* How will the pathrecord be used */
  99 };
 100
 101 #define IB_SA_ENABLE_LOCAL_SERVICE      0x00000001
 102 #define IB_SA_CANCEL                    0x00000002
 103
 104 struct ib_sa_service_query {
 105         void (*callback)(int, struct ib_sa_service_rec *, void *);
 106         void *context;
 107         struct ib_sa_query sa_query;
 108 };
 109
 110 struct ib_sa_path_query {
 111         void (*callback)(int, struct ib_sa_path_rec *, void *);
 112         void *context;
 113         struct ib_sa_query sa_query;
 114 };
 115
 116 struct ib_sa_guidinfo_query {
 117         void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
 118         void *context;
 119         struct ib_sa_query sa_query;
 120 };
 121
 122 struct ib_sa_mcmember_query {
 123         void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
 124         void *context;
 125         struct ib_sa_query sa_query;
 126 };
 127
 128 static LIST_HEAD(ib_nl_request_list);
 129 static DEFINE_SPINLOCK(ib_nl_request_lock);
 130 static atomic_t ib_nl_sa_request_seq;
 131 static struct workqueue_struct *ib_nl_wq;
 132 static struct delayed_work ib_nl_timed_work;
 133 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
 134         [LS_NLA_TYPE_PATH_RECORD]       = {.type = NLA_BINARY,
 135                 .len = sizeof(struct ib_path_rec_data)},
 136         [LS_NLA_TYPE_TIMEOUT]           = {.type = NLA_U32},
 137         [LS_NLA_TYPE_SERVICE_ID]        = {.type = NLA_U64},
 138         [LS_NLA_TYPE_DGID]              = {.type = NLA_BINARY,
 139                 .len = sizeof(struct rdma_nla_ls_gid)},
 140         [LS_NLA_TYPE_SGID]              = {.type = NLA_BINARY,
 141                 .len = sizeof(struct rdma_nla_ls_gid)},
 142         [LS_NLA_TYPE_TCLASS]            = {.type = NLA_U8},
 143         [LS_NLA_TYPE_PKEY]              = {.type = NLA_U16},
 144         [LS_NLA_TYPE_QOS_CLASS]         = {.type = NLA_U16},
 145 };
 146
 147
 148 static void ib_sa_add_one(struct ib_device *device);
 149 static void ib_sa_remove_one(struct ib_device *device, void *client_data);
 150
 151 static struct ib_client sa_client = {
 152         .name   = "sa",
 153         .add    = ib_sa_add_one,
 154         .remove = ib_sa_remove_one
 155 };
 156
 157 static DEFINE_SPINLOCK(idr_lock);
 158 static DEFINE_IDR(query_idr);
 159
 160 static DEFINE_SPINLOCK(tid_lock);
 161 static u32 tid;
 162
 163 #define PATH_REC_FIELD(field) \
 164         .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field),          \
 165         .struct_size_bytes   = sizeof ((struct ib_sa_path_rec *) 0)->field,     \
 166         .field_name          = "sa_path_rec:" #field
 167
 168 static const struct ib_field path_rec_table[] = {
 169         { PATH_REC_FIELD(service_id),
 170           .offset_words = 0,
 171           .offset_bits  = 0,
 172           .size_bits    = 64 },
 173         { PATH_REC_FIELD(dgid),
 174           .offset_words = 2,
 175           .offset_bits  = 0,
 176           .size_bits    = 128 },
 177         { PATH_REC_FIELD(sgid),
 178           .offset_words = 6,
 179           .offset_bits  = 0,
 180           .size_bits    = 128 },
 181         { PATH_REC_FIELD(dlid),
 182           .offset_words = 10,
 183           .offset_bits  = 0,
 184           .size_bits    = 16 },
 185         { PATH_REC_FIELD(slid),
 186           .offset_words = 10,
 187           .offset_bits  = 16,
 188           .size_bits    = 16 },
 189         { PATH_REC_FIELD(raw_traffic),
 190           .offset_words = 11,
 191           .offset_bits  = 0,
 192           .size_bits    = 1 },
 193         { RESERVED,
 194           .offset_words = 11,
 195           .offset_bits  = 1,
 196           .size_bits    = 3 },
 197         { PATH_REC_FIELD(flow_label),
 198           .offset_words = 11,
 199           .offset_bits  = 4,
 200           .size_bits    = 20 },
 201         { PATH_REC_FIELD(hop_limit),
 202           .offset_words = 11,
 203           .offset_bits  = 24,
 204           .size_bits    = 8 },
 205         { PATH_REC_FIELD(traffic_class),
 206           .offset_words = 12,
 207           .offset_bits  = 0,
 208           .size_bits    = 8 },
 209         { PATH_REC_FIELD(reversible),
 210           .offset_words = 12,
 211           .offset_bits  = 8,
 212           .size_bits    = 1 },
 213         { PATH_REC_FIELD(numb_path),
 214           .offset_words = 12,
 215           .offset_bits  = 9,
 216           .size_bits    = 7 },
 217         { PATH_REC_FIELD(pkey),
 218           .offset_words = 12,
 219           .offset_bits  = 16,
 220           .size_bits    = 16 },
 221         { PATH_REC_FIELD(qos_class),
 222           .offset_words = 13,
 223           .offset_bits  = 0,
 224           .size_bits    = 12 },
 225         { PATH_REC_FIELD(sl),
 226           .offset_words = 13,
 227           .offset_bits  = 12,
 228           .size_bits    = 4 },
 229         { PATH_REC_FIELD(mtu_selector),
 230           .offset_words = 13,
 231           .offset_bits  = 16,
 232           .size_bits    = 2 },
 233         { PATH_REC_FIELD(mtu),
 234           .offset_words = 13,
 235           .offset_bits  = 18,
 236           .size_bits    = 6 },
 237         { PATH_REC_FIELD(rate_selector),
 238           .offset_words = 13,
 239           .offset_bits  = 24,
 240           .size_bits    = 2 },
 241         { PATH_REC_FIELD(rate),
 242           .offset_words = 13,
 243           .offset_bits  = 26,
 244           .size_bits    = 6 },
 245         { PATH_REC_FIELD(packet_life_time_selector),
 246           .offset_words = 14,
 247           .offset_bits  = 0,
 248           .size_bits    = 2 },
 249         { PATH_REC_FIELD(packet_life_time),
 250           .offset_words = 14,
 251           .offset_bits  = 2,
 252           .size_bits    = 6 },
 253         { PATH_REC_FIELD(preference),
 254           .offset_words = 14,
 255           .offset_bits  = 8,
 256           .size_bits    = 8 },
 257         { RESERVED,
 258           .offset_words = 14,
 259           .offset_bits  = 16,
 260           .size_bits    = 48 },
 261 };
 262
 263 #define MCMEMBER_REC_FIELD(field) \
 264         .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),      \
 265         .struct_size_bytes   = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
 266         .field_name          = "sa_mcmember_rec:" #field
 267
 268 static const struct ib_field mcmember_rec_table[] = {
 269         { MCMEMBER_REC_FIELD(mgid),
 270           .offset_words = 0,
 271           .offset_bits  = 0,
 272           .size_bits    = 128 },
 273         { MCMEMBER_REC_FIELD(port_gid),
 274           .offset_words = 4,
 275           .offset_bits  = 0,
 276           .size_bits    = 128 },
 277         { MCMEMBER_REC_FIELD(qkey),
 278           .offset_words = 8,
 279           .offset_bits  = 0,
 280           .size_bits    = 32 },
 281         { MCMEMBER_REC_FIELD(mlid),
 282           .offset_words = 9,
 283           .offset_bits  = 0,
 284           .size_bits    = 16 },
 285         { MCMEMBER_REC_FIELD(mtu_selector),
 286           .offset_words = 9,
 287           .offset_bits  = 16,
 288           .size_bits    = 2 },
 289         { MCMEMBER_REC_FIELD(mtu),
 290           .offset_words = 9,
 291           .offset_bits  = 18,
 292           .size_bits    = 6 },
 293         { MCMEMBER_REC_FIELD(traffic_class),
 294           .offset_words = 9,
 295           .offset_bits  = 24,
 296           .size_bits    = 8 },
 297         { MCMEMBER_REC_FIELD(pkey),
 298           .offset_words = 10,
 299           .offset_bits  = 0,
 300           .size_bits    = 16 },
 301         { MCMEMBER_REC_FIELD(rate_selector),
 302           .offset_words = 10,
 303           .offset_bits  = 16,
 304           .size_bits    = 2 },
 305         { MCMEMBER_REC_FIELD(rate),
 306           .offset_words = 10,
 307           .offset_bits  = 18,
 308           .size_bits    = 6 },
 309         { MCMEMBER_REC_FIELD(packet_life_time_selector),
 310           .offset_words = 10,
 311           .offset_bits  = 24,
 312           .size_bits    = 2 },
 313         { MCMEMBER_REC_FIELD(packet_life_time),
 314           .offset_words = 10,
 315           .offset_bits  = 26,
 316           .size_bits    = 6 },
 317         { MCMEMBER_REC_FIELD(sl),
 318           .offset_words = 11,
 319           .offset_bits  = 0,
 320           .size_bits    = 4 },
 321         { MCMEMBER_REC_FIELD(flow_label),
 322           .offset_words = 11,
 323           .offset_bits  = 4,
 324           .size_bits    = 20 },
 325         { MCMEMBER_REC_FIELD(hop_limit),
 326           .offset_words = 11,
 327           .offset_bits  = 24,
 328           .size_bits    = 8 },
 329         { MCMEMBER_REC_FIELD(scope),
 330           .offset_words = 12,
 331           .offset_bits  = 0,
 332           .size_bits    = 4 },
 333         { MCMEMBER_REC_FIELD(join_state),
 334           .offset_words = 12,
 335           .offset_bits  = 4,
 336           .size_bits    = 4 },
 337         { MCMEMBER_REC_FIELD(proxy_join),
 338           .offset_words = 12,
 339           .offset_bits  = 8,
 340           .size_bits    = 1 },
 341         { RESERVED,
 342           .offset_words = 12,
 343           .offset_bits  = 9,
 344           .size_bits    = 23 },
 345 };
 346
 347 #define SERVICE_REC_FIELD(field) \
 348         .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field),       \
 349         .struct_size_bytes   = sizeof ((struct ib_sa_service_rec *) 0)->field,  \
 350         .field_name          = "sa_service_rec:" #field
 351
 352 static const struct ib_field service_rec_table[] = {
 353         { SERVICE_REC_FIELD(id),
 354           .offset_words = 0,
 355           .offset_bits  = 0,
 356           .size_bits    = 64 },
 357         { SERVICE_REC_FIELD(gid),
 358           .offset_words = 2,
 359           .offset_bits  = 0,
 360           .size_bits    = 128 },
 361         { SERVICE_REC_FIELD(pkey),
 362           .offset_words = 6,
 363           .offset_bits  = 0,
 364           .size_bits    = 16 },
 365         { SERVICE_REC_FIELD(lease),
 366           .offset_words = 7,
 367           .offset_bits  = 0,
 368           .size_bits    = 32 },
 369         { SERVICE_REC_FIELD(key),
 370           .offset_words = 8,
 371           .offset_bits  = 0,
 372           .size_bits    = 128 },
 373         { SERVICE_REC_FIELD(name),
 374           .offset_words = 12,
 375           .offset_bits  = 0,
 376           .size_bits    = 64*8 },
 377         { SERVICE_REC_FIELD(data8),
 378           .offset_words = 28,
 379           .offset_bits  = 0,
 380           .size_bits    = 16*8 },
 381         { SERVICE_REC_FIELD(data16),
 382           .offset_words = 32,
 383           .offset_bits  = 0,
 384           .size_bits    = 8*16 },
 385         { SERVICE_REC_FIELD(data32),
 386           .offset_words = 36,
 387           .offset_bits  = 0,
 388           .size_bits    = 4*32 },
 389         { SERVICE_REC_FIELD(data64),
 390           .offset_words = 40,
 391           .offset_bits  = 0,
 392           .size_bits    = 2*64 },
 393 };
 394
 395 #define GUIDINFO_REC_FIELD(field) \
 396         .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field),      \
 397         .struct_size_bytes   = sizeof((struct ib_sa_guidinfo_rec *) 0)->field,  \
 398         .field_name          = "sa_guidinfo_rec:" #field
 399
 400 static const struct ib_field guidinfo_rec_table[] = {
 401         { GUIDINFO_REC_FIELD(lid),
 402           .offset_words = 0,
 403           .offset_bits  = 0,
 404           .size_bits    = 16 },
 405         { GUIDINFO_REC_FIELD(block_num),
 406           .offset_words = 0,
 407           .offset_bits  = 16,
 408           .size_bits    = 8 },
 409         { GUIDINFO_REC_FIELD(res1),
 410           .offset_words = 0,
 411           .offset_bits  = 24,
 412           .size_bits    = 8 },
 413         { GUIDINFO_REC_FIELD(res2),
 414           .offset_words = 1,
 415           .offset_bits  = 0,
 416           .size_bits    = 32 },
 417         { GUIDINFO_REC_FIELD(guid_info_list),
 418           .offset_words = 2,
 419           .offset_bits  = 0,
 420           .size_bits    = 512 },
 421 };
 422
 423 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
 424 {
 425         query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
 426 }
 427
 428 static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
 429 {
 430         return (query->flags & IB_SA_CANCEL);
 431 }
 432
 433 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
 434                                      struct ib_sa_query *query)
 435 {
 436         struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1];
 437         struct ib_sa_mad *mad = query->mad_buf->mad;
 438         ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
 439         u16 val16;
 440         u64 val64;
 441         struct rdma_ls_resolve_header *header;
 442
 443         query->mad_buf->context[1] = NULL;
 444
 445         /* Construct the family header first */
 446         header = (struct rdma_ls_resolve_header *)
 447                 skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 448         memcpy(header->device_name, query->port->agent->device->name,
 449                LS_DEVICE_NAME_MAX);
 450         header->port_num = query->port->port_num;
 451
 452         if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
 453             sa_rec->reversible != 0)
 454                 query->path_use = LS_RESOLVE_PATH_USE_GMP;
 455         else
 456                 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
 457         header->path_use = query->path_use;
 458
 459         /* Now build the attributes */
 460         if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
 461                 val64 = be64_to_cpu(sa_rec->service_id);
 462                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
 463                         sizeof(val64), &val64);
 464         }
 465         if (comp_mask & IB_SA_PATH_REC_DGID)
 466                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
 467                         sizeof(sa_rec->dgid), &sa_rec->dgid);
 468         if (comp_mask & IB_SA_PATH_REC_SGID)
 469                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
 470                         sizeof(sa_rec->sgid), &sa_rec->sgid);
 471         if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
 472                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
 473                         sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
 474
 475         if (comp_mask & IB_SA_PATH_REC_PKEY) {
 476                 val16 = be16_to_cpu(sa_rec->pkey);
 477                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
 478                         sizeof(val16), &val16);
 479         }
 480         if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
 481                 val16 = be16_to_cpu(sa_rec->qos_class);
 482                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
 483                         sizeof(val16), &val16);
 484         }
 485 }
 486
 487 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
 488 {
 489         int len = 0;
 490
 491         if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
 492                 len += nla_total_size(sizeof(u64));
 493         if (comp_mask & IB_SA_PATH_REC_DGID)
 494                 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
 495         if (comp_mask & IB_SA_PATH_REC_SGID)
 496                 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
 497         if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
 498                 len += nla_total_size(sizeof(u8));
 499         if (comp_mask & IB_SA_PATH_REC_PKEY)
 500                 len += nla_total_size(sizeof(u16));
 501         if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
 502                 len += nla_total_size(sizeof(u16));
 503
 504         /*
 505          * Make sure that at least some of the required comp_mask bits are
 506          * set.
 507          */
 508         if (WARN_ON(len == 0))
 509                 return len;
 510
 511         /* Add the family header */
 512         len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
 513
 514         return len;
 515 }
 516
 517 static int ib_nl_send_msg(struct ib_sa_query *query, gfp_t gfp_mask)
 518 {
 519         struct sk_buff *skb = NULL;
 520         struct nlmsghdr *nlh;
 521         void *data;
 522         int ret = 0;
 523         struct ib_sa_mad *mad;
 524         int len;
 525
 526         mad = query->mad_buf->mad;
 527         len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
 528         if (len <= 0)
 529                 return -EMSGSIZE;
 530
 531         skb = nlmsg_new(len, gfp_mask);
 532         if (!skb)
 533                 return -ENOMEM;
 534
 535         /* Put nlmsg header only for now */
 536         data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
 537                             RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
 538         if (!data) {
 539                 nlmsg_free(skb);
 540                 return -EMSGSIZE;
 541         }
 542
 543         /* Add attributes */
 544         ib_nl_set_path_rec_attrs(skb, query);
 545
 546         /* Repair the nlmsg header length */
 547         nlmsg_end(skb, nlh);
 548
 549         ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, gfp_mask);
 550         if (!ret)
 551                 ret = len;
 552         else
 553                 ret = 0;
 554
 555         return ret;
 556 }
 557
 558 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
 559 {
 560         unsigned long flags;
 561         unsigned long delay;
 562         int ret;
 563
 564         INIT_LIST_HEAD(&query->list);
 565         query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
 566
 567         /* Put the request on the list first.*/
 568         spin_lock_irqsave(&ib_nl_request_lock, flags);
 569         delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
 570         query->timeout = delay + jiffies;
 571         list_add_tail(&query->list, &ib_nl_request_list);
 572         /* Start the timeout if this is the only request */
 573         if (ib_nl_request_list.next == &query->list)
 574                 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
 575         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 576
 577         ret = ib_nl_send_msg(query, gfp_mask);
 578         if (ret <= 0) {
 579                 ret = -EIO;
 580                 /* Remove the request */
 581                 spin_lock_irqsave(&ib_nl_request_lock, flags);
 582                 list_del(&query->list);
 583                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 584         } else {
 585                 ret = 0;
 586         }
 587
 588         return ret;
 589 }
 590
 591 static int ib_nl_cancel_request(struct ib_sa_query *query)
 592 {
 593         unsigned long flags;
 594         struct ib_sa_query *wait_query;
 595         int found = 0;
 596
 597         spin_lock_irqsave(&ib_nl_request_lock, flags);
 598         list_for_each_entry(wait_query, &ib_nl_request_list, list) {
 599                 /* Let the timeout to take care of the callback */
 600                 if (query == wait_query) {
 601                         query->flags |= IB_SA_CANCEL;
 602                         query->timeout = jiffies;
 603                         list_move(&query->list, &ib_nl_request_list);
 604                         found = 1;
 605                         mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
 606                         break;
 607                 }
 608         }
 609         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 610
 611         return found;
 612 }
 613
 614 static void send_handler(struct ib_mad_agent *agent,
 615                          struct ib_mad_send_wc *mad_send_wc);
 616
 617 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
 618                                            const struct nlmsghdr *nlh)
 619 {
 620         struct ib_mad_send_wc mad_send_wc;
 621         struct ib_sa_mad *mad = NULL;
 622         const struct nlattr *head, *curr;
 623         struct ib_path_rec_data  *rec;
 624         int len, rem;
 625         u32 mask = 0;
 626         int status = -EIO;
 627
 628         if (query->callback) {
 629                 head = (const struct nlattr *) nlmsg_data(nlh);
 630                 len = nlmsg_len(nlh);
 631                 switch (query->path_use) {
 632                 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
 633                         mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
 634                         break;
 635
 636                 case LS_RESOLVE_PATH_USE_ALL:
 637                 case LS_RESOLVE_PATH_USE_GMP:
 638                 default:
 639                         mask = IB_PATH_PRIMARY | IB_PATH_GMP |
 640                                 IB_PATH_BIDIRECTIONAL;
 641                         break;
 642                 }
 643                 nla_for_each_attr(curr, head, len, rem) {
 644                         if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
 645                                 rec = nla_data(curr);
 646                                 /*
 647                                  * Get the first one. In the future, we may
 648                                  * need to get up to 6 pathrecords.
 649                                  */
 650                                 if ((rec->flags & mask) == mask) {
 651                                         mad = query->mad_buf->mad;
 652                                         mad->mad_hdr.method |=
 653                                                 IB_MGMT_METHOD_RESP;
 654                                         memcpy(mad->data, rec->path_rec,
 655                                                sizeof(rec->path_rec));
 656                                         status = 0;
 657                                         break;
 658                                 }
 659                         }
 660                 }
 661                 query->callback(query, status, mad);
 662         }
 663
 664         mad_send_wc.send_buf = query->mad_buf;
 665         mad_send_wc.status = IB_WC_SUCCESS;
 666         send_handler(query->mad_buf->mad_agent, &mad_send_wc);
 667 }
 668
 669 static void ib_nl_request_timeout(struct work_struct *work)
 670 {
 671         unsigned long flags;
 672         struct ib_sa_query *query;
 673         unsigned long delay;
 674         struct ib_mad_send_wc mad_send_wc;
 675         int ret;
 676
 677         spin_lock_irqsave(&ib_nl_request_lock, flags);
 678         while (!list_empty(&ib_nl_request_list)) {
 679                 query = list_entry(ib_nl_request_list.next,
 680                                    struct ib_sa_query, list);
 681
 682                 if (time_after(query->timeout, jiffies)) {
 683                         delay = query->timeout - jiffies;
 684                         if ((long)delay <= 0)
 685                                 delay = 1;
 686                         queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
 687                         break;
 688                 }
 689
 690                 list_del(&query->list);
 691                 ib_sa_disable_local_svc(query);
 692                 /* Hold the lock to protect against query cancellation */
 693                 if (ib_sa_query_cancelled(query))
 694                         ret = -1;
 695                 else
 696                         ret = ib_post_send_mad(query->mad_buf, NULL);
 697                 if (ret) {
 698                         mad_send_wc.send_buf = query->mad_buf;
 699                         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
 700                         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 701                         send_handler(query->port->agent, &mad_send_wc);
 702                         spin_lock_irqsave(&ib_nl_request_lock, flags);
 703                 }
 704         }
 705         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 706 }
 707
 708 static int ib_nl_handle_set_timeout(struct sk_buff *skb,
 709                                     struct netlink_callback *cb)
 710 {
 711         const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
 712         int timeout, delta, abs_delta;
 713         const struct nlattr *attr;
 714         unsigned long flags;
 715         struct ib_sa_query *query;
 716         long delay = 0;
 717         struct nlattr *tb[LS_NLA_TYPE_MAX];
 718         int ret;
 719
 720         if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
 721             !(NETLINK_CB(skb).sk) ||
 722             !netlink_capable(skb, CAP_NET_ADMIN))
 723                 return -EPERM;
 724
 725         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
 726                         nlmsg_len(nlh), ib_nl_policy);
 727         attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
 728         if (ret || !attr)
 729                 goto settimeout_out;
 730
 731         timeout = *(int *) nla_data(attr);
 732         if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
 733                 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
 734         if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
 735                 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
 736
 737         delta = timeout - sa_local_svc_timeout_ms;
 738         if (delta < 0)
 739                 abs_delta = -delta;
 740         else
 741                 abs_delta = delta;
 742
 743         if (delta != 0) {
 744                 spin_lock_irqsave(&ib_nl_request_lock, flags);
 745                 sa_local_svc_timeout_ms = timeout;
 746                 list_for_each_entry(query, &ib_nl_request_list, list) {
 747                         if (delta < 0 && abs_delta > query->timeout)
 748                                 query->timeout = 0;
 749                         else
 750                                 query->timeout += delta;
 751
 752                         /* Get the new delay from the first entry */
 753                         if (!delay) {
 754                                 delay = query->timeout - jiffies;
 755                                 if (delay <= 0)
 756                                         delay = 1;
 757                         }
 758                 }
 759                 if (delay)
 760                         mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
 761                                          (unsigned long)delay);
 762                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 763         }
 764
 765 settimeout_out:
 766         return skb->len;
 767 }
 768
 769 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
 770 {
 771         struct nlattr *tb[LS_NLA_TYPE_MAX];
 772         int ret;
 773
 774         if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
 775                 return 0;
 776
 777         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
 778                         nlmsg_len(nlh), ib_nl_policy);
 779         if (ret)
 780                 return 0;
 781
 782         return 1;
 783 }
 784
 785 static int ib_nl_handle_resolve_resp(struct sk_buff *skb,
 786                                      struct netlink_callback *cb)
 787 {
 788         const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
 789         unsigned long flags;
 790         struct ib_sa_query *query;
 791         struct ib_mad_send_buf *send_buf;
 792         struct ib_mad_send_wc mad_send_wc;
 793         int found = 0;
 794         int ret;
 795
 796         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
 797             !(NETLINK_CB(skb).sk) ||
 798             !netlink_capable(skb, CAP_NET_ADMIN))
 799                 return -EPERM;
 800
 801         spin_lock_irqsave(&ib_nl_request_lock, flags);
 802         list_for_each_entry(query, &ib_nl_request_list, list) {
 803                 /*
 804                  * If the query is cancelled, let the timeout routine
 805                  * take care of it.
 806                  */
 807                 if (nlh->nlmsg_seq == query->seq) {
 808                         found = !ib_sa_query_cancelled(query);
 809                         if (found)
 810                                 list_del(&query->list);
 811                         break;
 812                 }
 813         }
 814
 815         if (!found) {
 816                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 817                 goto resp_out;
 818         }
 819
 820         send_buf = query->mad_buf;
 821
 822         if (!ib_nl_is_good_resolve_resp(nlh)) {
 823                 /* if the result is a failure, send out the packet via IB */
 824                 ib_sa_disable_local_svc(query);
 825                 ret = ib_post_send_mad(query->mad_buf, NULL);
 826                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 827                 if (ret) {
 828                         mad_send_wc.send_buf = send_buf;
 829                         mad_send_wc.status = IB_WC_GENERAL_ERR;
 830                         send_handler(query->port->agent, &mad_send_wc);
 831                 }
 832         } else {
 833                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 834                 ib_nl_process_good_resolve_rsp(query, nlh);
 835         }
 836
 837 resp_out:
 838         return skb->len;
 839 }
 840
 841 static struct ibnl_client_cbs ib_sa_cb_table[] = {
 842         [RDMA_NL_LS_OP_RESOLVE] = {
 843                 .dump = ib_nl_handle_resolve_resp,
 844                 .module = THIS_MODULE },
 845         [RDMA_NL_LS_OP_SET_TIMEOUT] = {
 846                 .dump = ib_nl_handle_set_timeout,
 847                 .module = THIS_MODULE },
 848 };
 849
 850 static void free_sm_ah(struct kref *kref)
 851 {
 852         struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
 853
 854         ib_destroy_ah(sm_ah->ah);
 855         kfree(sm_ah);
 856 }
 857
 858 static void update_sm_ah(struct work_struct *work)
 859 {
 860         struct ib_sa_port *port =
 861                 container_of(work, struct ib_sa_port, update_task);
 862         struct ib_sa_sm_ah *new_ah;
 863         struct ib_port_attr port_attr;
 864         struct ib_ah_attr   ah_attr;
 865
 866         if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
 867                 pr_warn("Couldn't query port\n");
 868                 return;
 869         }
 870
 871         new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
 872         if (!new_ah) {
 873                 return;
 874         }
 875
 876         kref_init(&new_ah->ref);
 877         new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
 878
 879         new_ah->pkey_index = 0;
 880         if (ib_find_pkey(port->agent->device, port->port_num,
 881                          IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
 882                 pr_err("Couldn't find index for default PKey\n");
 883
 884         memset(&ah_attr, 0, sizeof ah_attr);
 885         ah_attr.dlid     = port_attr.sm_lid;
 886         ah_attr.sl       = port_attr.sm_sl;
 887         ah_attr.port_num = port->port_num;
 888         if (port_attr.grh_required) {
 889                 ah_attr.ah_flags = IB_AH_GRH;
 890                 ah_attr.grh.dgid.global.subnet_prefix = cpu_to_be64(port_attr.subnet_prefix);
 891                 ah_attr.grh.dgid.global.interface_id = cpu_to_be64(IB_SA_WELL_KNOWN_GUID);
 892         }
 893
 894         new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
 895         if (IS_ERR(new_ah->ah)) {
 896                 pr_warn("Couldn't create new SM AH\n");
 897                 kfree(new_ah);
 898                 return;
 899         }
 900
 901         spin_lock_irq(&port->ah_lock);
 902         if (port->sm_ah)
 903                 kref_put(&port->sm_ah->ref, free_sm_ah);
 904         port->sm_ah = new_ah;
 905         spin_unlock_irq(&port->ah_lock);
 906
 907 }
 908
 909 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
 910 {
 911         if (event->event == IB_EVENT_PORT_ERR    ||
 912             event->event == IB_EVENT_PORT_ACTIVE ||
 913             event->event == IB_EVENT_LID_CHANGE  ||
 914             event->event == IB_EVENT_PKEY_CHANGE ||
 915             event->event == IB_EVENT_SM_CHANGE   ||
 916             event->event == IB_EVENT_CLIENT_REREGISTER) {
 917                 unsigned long flags;
 918                 struct ib_sa_device *sa_dev =
 919                         container_of(handler, typeof(*sa_dev), event_handler);
 920                 struct ib_sa_port *port =
 921                         &sa_dev->port[event->element.port_num - sa_dev->start_port];
 922
 923                 if (!rdma_cap_ib_sa(handler->device, port->port_num))
 924                         return;
 925
 926                 spin_lock_irqsave(&port->ah_lock, flags);
 927                 if (port->sm_ah)
 928                         kref_put(&port->sm_ah->ref, free_sm_ah);
 929                 port->sm_ah = NULL;
 930                 spin_unlock_irqrestore(&port->ah_lock, flags);
 931
 932                 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
 933                                             sa_dev->start_port].update_task);
 934         }
 935 }
 936
 937 void ib_sa_register_client(struct ib_sa_client *client)
 938 {
 939         atomic_set(&client->users, 1);
 940         init_completion(&client->comp);
 941 }
 942 EXPORT_SYMBOL(ib_sa_register_client);
 943
 944 void ib_sa_unregister_client(struct ib_sa_client *client)
 945 {
 946         ib_sa_client_put(client);
 947         wait_for_completion(&client->comp);
 948 }
 949 EXPORT_SYMBOL(ib_sa_unregister_client);
 950
 951 /**
 952  * ib_sa_cancel_query - try to cancel an SA query
 953  * @id:ID of query to cancel
 954  * @query:query pointer to cancel
 955  *
 956  * Try to cancel an SA query.  If the id and query don't match up or
 957  * the query has already completed, nothing is done.  Otherwise the
 958  * query is canceled and will complete with a status of -EINTR.
 959  */
 960 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
 961 {
 962         unsigned long flags;
 963         struct ib_mad_agent *agent;
 964         struct ib_mad_send_buf *mad_buf;
 965
 966         spin_lock_irqsave(&idr_lock, flags);
 967         if (idr_find(&query_idr, id) != query) {
 968                 spin_unlock_irqrestore(&idr_lock, flags);
 969                 return;
 970         }
 971         agent = query->port->agent;
 972         mad_buf = query->mad_buf;
 973         spin_unlock_irqrestore(&idr_lock, flags);
 974
 975         /*
 976          * If the query is still on the netlink request list, schedule
 977          * it to be cancelled by the timeout routine. Otherwise, it has been
 978          * sent to the MAD layer and has to be cancelled from there.
 979          */
 980         if (!ib_nl_cancel_request(query))
 981                 ib_cancel_mad(agent, mad_buf);
 982 }
 983 EXPORT_SYMBOL(ib_sa_cancel_query);
 984
 985 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
 986 {
 987         struct ib_sa_device *sa_dev;
 988         struct ib_sa_port   *port;
 989         unsigned long flags;
 990         u8 src_path_mask;
 991
 992         sa_dev = ib_get_client_data(device, &sa_client);
 993         if (!sa_dev)
 994                 return 0x7f;
 995
 996         port  = &sa_dev->port[port_num - sa_dev->start_port];
 997         spin_lock_irqsave(&port->ah_lock, flags);
 998         src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
 999         spin_unlock_irqrestore(&port->ah_lock, flags);
1000
1001         return src_path_mask;
1002 }
1003
1004 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
1005                          struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
1006 {
1007         int ret;
1008         u16 gid_index;
1009         int use_roce;
1010         struct net_device *ndev = NULL;
1011
1012         memset(ah_attr, 0, sizeof *ah_attr);
1013         ah_attr->dlid = be16_to_cpu(rec->dlid);
1014         ah_attr->sl = rec->sl;
1015         ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1016                                  get_src_path_mask(device, port_num);
1017         ah_attr->port_num = port_num;
1018         ah_attr->static_rate = rec->rate;
1019
1020         use_roce = rdma_cap_eth_ah(device, port_num);
1021
1022         if (use_roce) {
1023                 struct net_device *idev;
1024                 struct net_device *resolved_dev;
1025                 struct rdma_dev_addr dev_addr = {.bound_dev_if = rec->ifindex,
1026                                                  .net = rec->net ? rec->net :
1027                                                          &init_net};
1028                 union {
1029                         struct sockaddr     _sockaddr;
1030                         struct sockaddr_in  _sockaddr_in;
1031                         struct sockaddr_in6 _sockaddr_in6;
1032                 } sgid_addr, dgid_addr;
1033
1034                 if (!device->get_netdev)
1035                         return -EOPNOTSUPP;
1036
1037                 rdma_gid2ip(&sgid_addr._sockaddr, &rec->sgid);
1038                 rdma_gid2ip(&dgid_addr._sockaddr, &rec->dgid);
1039
1040                 /* validate the route */
1041                 ret = rdma_resolve_ip_route(&sgid_addr._sockaddr,
1042                                             &dgid_addr._sockaddr, &dev_addr);
1043                 if (ret)
1044                         return ret;
1045
1046                 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
1047                      dev_addr.network == RDMA_NETWORK_IPV6) &&
1048                     rec->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
1049                         return -EINVAL;
1050
1051                 idev = device->get_netdev(device, port_num);
1052                 if (!idev)
1053                         return -ENODEV;
1054
1055                 resolved_dev = dev_get_by_index(dev_addr.net,
1056                                                 dev_addr.bound_dev_if);
1057                 if (resolved_dev->flags & IFF_LOOPBACK) {
1058                         dev_put(resolved_dev);
1059                         resolved_dev = idev;
1060                         dev_hold(resolved_dev);
1061                 }
1062                 ndev = ib_get_ndev_from_path(rec);
1063                 rcu_read_lock();
1064                 if ((ndev && ndev != resolved_dev) ||
1065                     (resolved_dev != idev &&
1066                      !rdma_is_upper_dev_rcu(idev, resolved_dev)))
1067                         ret = -EHOSTUNREACH;
1068                 rcu_read_unlock();
1069                 dev_put(idev);
1070                 dev_put(resolved_dev);
1071                 if (ret) {
1072                         if (ndev)
1073                                 dev_put(ndev);
1074                         return ret;
1075                 }
1076         }
1077
1078         if (rec->hop_limit > 0 || use_roce) {
1079                 ah_attr->ah_flags = IB_AH_GRH;
1080                 ah_attr->grh.dgid = rec->dgid;
1081
1082                 ret = ib_find_cached_gid_by_port(device, &rec->sgid,
1083                                                  rec->gid_type, port_num, ndev,
1084                                                  &gid_index);
1085                 if (ret) {
1086                         if (ndev)
1087                                 dev_put(ndev);
1088                         return ret;
1089                 }
1090
1091                 ah_attr->grh.sgid_index    = gid_index;
1092                 ah_attr->grh.flow_label    = be32_to_cpu(rec->flow_label);
1093                 ah_attr->grh.hop_limit     = rec->hop_limit;
1094                 ah_attr->grh.traffic_class = rec->traffic_class;
1095                 if (ndev)
1096                         dev_put(ndev);
1097         }
1098
1099         if (use_roce)
1100                 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1101
1102         return 0;
1103 }
1104 EXPORT_SYMBOL(ib_init_ah_from_path);
1105
1106 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1107 {
1108         unsigned long flags;
1109
1110         spin_lock_irqsave(&query->port->ah_lock, flags);
1111         if (!query->port->sm_ah) {
1112                 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1113                 return -EAGAIN;
1114         }
1115         kref_get(&query->port->sm_ah->ref);
1116         query->sm_ah = query->port->sm_ah;
1117         spin_unlock_irqrestore(&query->port->ah_lock, flags);
1118
1119         query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1120                                             query->sm_ah->pkey_index,
1121                                             0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1122                                             gfp_mask,
1123                                             IB_MGMT_BASE_VERSION);
1124         if (IS_ERR(query->mad_buf)) {
1125                 kref_put(&query->sm_ah->ref, free_sm_ah);
1126                 return -ENOMEM;
1127         }
1128
1129         query->mad_buf->ah = query->sm_ah->ah;
1130
1131         return 0;
1132 }
1133
1134 static void free_mad(struct ib_sa_query *query)
1135 {
1136         ib_free_send_mad(query->mad_buf);
1137         kref_put(&query->sm_ah->ref, free_sm_ah);
1138 }
1139
1140 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1141 {
1142         unsigned long flags;
1143
1144         memset(mad, 0, sizeof *mad);
1145
1146         mad->mad_hdr.base_version  = IB_MGMT_BASE_VERSION;
1147         mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_SUBN_ADM;
1148         mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1149
1150         spin_lock_irqsave(&tid_lock, flags);
1151         mad->mad_hdr.tid           =
1152                 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1153         spin_unlock_irqrestore(&tid_lock, flags);
1154 }
1155
1156 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1157 {
1158         bool preload = gfpflags_allow_blocking(gfp_mask);
1159         unsigned long flags;
1160         int ret, id;
1161
1162         if (preload)
1163                 idr_preload(gfp_mask);
1164         spin_lock_irqsave(&idr_lock, flags);
1165
1166         id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1167
1168         spin_unlock_irqrestore(&idr_lock, flags);
1169         if (preload)
1170                 idr_preload_end();
1171         if (id < 0)
1172                 return id;
1173
1174         query->mad_buf->timeout_ms  = timeout_ms;
1175         query->mad_buf->context[0] = query;
1176         query->id = id;
1177
1178         if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1179                 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1180                         if (!ib_nl_make_request(query, gfp_mask))
1181                                 return id;
1182                 }
1183                 ib_sa_disable_local_svc(query);
1184         }
1185
1186         ret = ib_post_send_mad(query->mad_buf, NULL);
1187         if (ret) {
1188                 spin_lock_irqsave(&idr_lock, flags);
1189                 idr_remove(&query_idr, id);
1190                 spin_unlock_irqrestore(&idr_lock, flags);
1191         }
1192
1193         /*
1194          * It's not safe to dereference query any more, because the
1195          * send may already have completed and freed the query in
1196          * another context.
1197          */
1198         return ret ? ret : id;
1199 }
1200
1201 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1202 {
1203         ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1204 }
1205 EXPORT_SYMBOL(ib_sa_unpack_path);
1206
1207 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1208 {
1209         ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1210 }
1211 EXPORT_SYMBOL(ib_sa_pack_path);
1212
1213 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1214                                     int status,
1215                                     struct ib_sa_mad *mad)
1216 {
1217         struct ib_sa_path_query *query =
1218                 container_of(sa_query, struct ib_sa_path_query, sa_query);
1219
1220         if (mad) {
1221                 struct ib_sa_path_rec rec;
1222
1223                 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1224                           mad->data, &rec);
1225                 rec.net = NULL;
1226                 rec.ifindex = 0;
1227                 rec.gid_type = IB_GID_TYPE_IB;
1228                 eth_zero_addr(rec.dmac);
1229                 query->callback(status, &rec, query->context);
1230         } else
1231                 query->callback(status, NULL, query->context);
1232 }
1233
1234 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1235 {
1236         kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1237 }
1238
1239 /**
1240  * ib_sa_path_rec_get - Start a Path get query
1241  * @client:SA client
1242  * @device:device to send query on
1243  * @port_num: port number to send query on
1244  * @rec:Path Record to send in query
1245  * @comp_mask:component mask to send in query
1246  * @timeout_ms:time to wait for response
1247  * @gfp_mask:GFP mask to use for internal allocations
1248  * @callback:function called when query completes, times out or is
1249  * canceled
1250  * @context:opaque user context passed to callback
1251  * @sa_query:query context, used to cancel query
1252  *
1253  * Send a Path Record Get query to the SA to look up a path.  The
1254  * callback function will be called when the query completes (or
1255  * fails); status is 0 for a successful response, -EINTR if the query
1256  * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1257  * occurred sending the query.  The resp parameter of the callback is
1258  * only valid if status is 0.
1259  *
1260  * If the return value of ib_sa_path_rec_get() is negative, it is an
1261  * error code.  Otherwise it is a query ID that can be used to cancel
1262  * the query.
1263  */
1264 int ib_sa_path_rec_get(struct ib_sa_client *client,
1265                        struct ib_device *device, u8 port_num,
1266                        struct ib_sa_path_rec *rec,
1267                        ib_sa_comp_mask comp_mask,
1268                        int timeout_ms, gfp_t gfp_mask,
1269                        void (*callback)(int status,
1270                                         struct ib_sa_path_rec *resp,
1271                                         void *context),
1272                        void *context,
1273                        struct ib_sa_query **sa_query)
1274 {
1275         struct ib_sa_path_query *query;
1276         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1277         struct ib_sa_port   *port;
1278         struct ib_mad_agent *agent;
1279         struct ib_sa_mad *mad;
1280         int ret;
1281
1282         if (!sa_dev)
1283                 return -ENODEV;
1284
1285         port  = &sa_dev->port[port_num - sa_dev->start_port];
1286         agent = port->agent;
1287
1288         query = kzalloc(sizeof(*query), gfp_mask);
1289         if (!query)
1290                 return -ENOMEM;
1291
1292         query->sa_query.port     = port;
1293         ret = alloc_mad(&query->sa_query, gfp_mask);
1294         if (ret)
1295                 goto err1;
1296
1297         ib_sa_client_get(client);
1298         query->sa_query.client = client;
1299         query->callback        = callback;
1300         query->context         = context;
1301
1302         mad = query->sa_query.mad_buf->mad;
1303         init_mad(mad, agent);
1304
1305         query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1306         query->sa_query.release  = ib_sa_path_rec_release;
1307         mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
1308         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1309         mad->sa_hdr.comp_mask    = comp_mask;
1310
1311         ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1312
1313         *sa_query = &query->sa_query;
1314
1315         query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1316         query->sa_query.mad_buf->context[1] = rec;
1317
1318         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1319         if (ret < 0)
1320                 goto err2;
1321
1322         return ret;
1323
1324 err2:
1325         *sa_query = NULL;
1326         ib_sa_client_put(query->sa_query.client);
1327         free_mad(&query->sa_query);
1328
1329 err1:
1330         kfree(query);
1331         return ret;
1332 }
1333 EXPORT_SYMBOL(ib_sa_path_rec_get);
1334
1335 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1336                                     int status,
1337                                     struct ib_sa_mad *mad)
1338 {
1339         struct ib_sa_service_query *query =
1340                 container_of(sa_query, struct ib_sa_service_query, sa_query);
1341
1342         if (mad) {
1343                 struct ib_sa_service_rec rec;
1344
1345                 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1346                           mad->data, &rec);
1347                 query->callback(status, &rec, query->context);
1348         } else
1349                 query->callback(status, NULL, query->context);
1350 }
1351
1352 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1353 {
1354         kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1355 }
1356
1357 /**
1358  * ib_sa_service_rec_query - Start Service Record operation
1359  * @client:SA client
1360  * @device:device to send request on
1361  * @port_num: port number to send request on
1362  * @method:SA method - should be get, set, or delete
1363  * @rec:Service Record to send in request
1364  * @comp_mask:component mask to send in request
1365  * @timeout_ms:time to wait for response
1366  * @gfp_mask:GFP mask to use for internal allocations
1367  * @callback:function called when request completes, times out or is
1368  * canceled
1369  * @context:opaque user context passed to callback
1370  * @sa_query:request context, used to cancel request
1371  *
1372  * Send a Service Record set/get/delete to the SA to register,
1373  * unregister or query a service record.
1374  * The callback function will be called when the request completes (or
1375  * fails); status is 0 for a successful response, -EINTR if the query
1376  * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1377  * occurred sending the query.  The resp parameter of the callback is
1378  * only valid if status is 0.
1379  *
1380  * If the return value of ib_sa_service_rec_query() is negative, it is an
1381  * error code.  Otherwise it is a request ID that can be used to cancel
1382  * the query.
1383  */
1384 int ib_sa_service_rec_query(struct ib_sa_client *client,
1385                             struct ib_device *device, u8 port_num, u8 method,
1386                             struct ib_sa_service_rec *rec,
1387                             ib_sa_comp_mask comp_mask,
1388                             int timeout_ms, gfp_t gfp_mask,
1389                             void (*callback)(int status,
1390                                              struct ib_sa_service_rec *resp,
1391                                              void *context),
1392                             void *context,
1393                             struct ib_sa_query **sa_query)
1394 {
1395         struct ib_sa_service_query *query;
1396         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1397         struct ib_sa_port   *port;
1398         struct ib_mad_agent *agent;
1399         struct ib_sa_mad *mad;
1400         int ret;
1401
1402         if (!sa_dev)
1403                 return -ENODEV;
1404
1405         port  = &sa_dev->port[port_num - sa_dev->start_port];
1406         agent = port->agent;
1407
1408         if (method != IB_MGMT_METHOD_GET &&
1409             method != IB_MGMT_METHOD_SET &&
1410             method != IB_SA_METHOD_DELETE)
1411                 return -EINVAL;
1412
1413         query = kzalloc(sizeof(*query), gfp_mask);
1414         if (!query)
1415                 return -ENOMEM;
1416
1417         query->sa_query.port     = port;
1418         ret = alloc_mad(&query->sa_query, gfp_mask);
1419         if (ret)
1420                 goto err1;
1421
1422         ib_sa_client_get(client);
1423         query->sa_query.client = client;
1424         query->callback        = callback;
1425         query->context         = context;
1426
1427         mad = query->sa_query.mad_buf->mad;
1428         init_mad(mad, agent);
1429
1430         query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1431         query->sa_query.release  = ib_sa_service_rec_release;
1432         mad->mad_hdr.method      = method;
1433         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1434         mad->sa_hdr.comp_mask    = comp_mask;
1435
1436         ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1437                 rec, mad->data);
1438
1439         *sa_query = &query->sa_query;
1440
1441         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1442         if (ret < 0)
1443                 goto err2;
1444
1445         return ret;
1446
1447 err2:
1448         *sa_query = NULL;
1449         ib_sa_client_put(query->sa_query.client);
1450         free_mad(&query->sa_query);
1451
1452 err1:
1453         kfree(query);
1454         return ret;
1455 }
1456 EXPORT_SYMBOL(ib_sa_service_rec_query);
1457
1458 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1459                                         int status,
1460                                         struct ib_sa_mad *mad)
1461 {
1462         struct ib_sa_mcmember_query *query =
1463                 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1464
1465         if (mad) {
1466                 struct ib_sa_mcmember_rec rec;
1467
1468                 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1469                           mad->data, &rec);
1470                 query->callback(status, &rec, query->context);
1471         } else
1472                 query->callback(status, NULL, query->context);
1473 }
1474
1475 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1476 {
1477         kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1478 }
1479
1480 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1481                              struct ib_device *device, u8 port_num,
1482                              u8 method,
1483                              struct ib_sa_mcmember_rec *rec,
1484                              ib_sa_comp_mask comp_mask,
1485                              int timeout_ms, gfp_t gfp_mask,
1486                              void (*callback)(int status,
1487                                               struct ib_sa_mcmember_rec *resp,
1488                                               void *context),
1489                              void *context,
1490                              struct ib_sa_query **sa_query)
1491 {
1492         struct ib_sa_mcmember_query *query;
1493         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1494         struct ib_sa_port   *port;
1495         struct ib_mad_agent *agent;
1496         struct ib_sa_mad *mad;
1497         int ret;
1498
1499         if (!sa_dev)
1500                 return -ENODEV;
1501
1502         port  = &sa_dev->port[port_num - sa_dev->start_port];
1503         agent = port->agent;
1504
1505         query = kzalloc(sizeof(*query), gfp_mask);
1506         if (!query)
1507                 return -ENOMEM;
1508
1509         query->sa_query.port     = port;
1510         ret = alloc_mad(&query->sa_query, gfp_mask);
1511         if (ret)
1512                 goto err1;
1513
1514         ib_sa_client_get(client);
1515         query->sa_query.client = client;
1516         query->callback        = callback;
1517         query->context         = context;
1518
1519         mad = query->sa_query.mad_buf->mad;
1520         init_mad(mad, agent);
1521
1522         query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1523         query->sa_query.release  = ib_sa_mcmember_rec_release;
1524         mad->mad_hdr.method      = method;
1525         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1526         mad->sa_hdr.comp_mask    = comp_mask;
1527
1528         ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1529                 rec, mad->data);
1530
1531         *sa_query = &query->sa_query;
1532
1533         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1534         if (ret < 0)
1535                 goto err2;
1536
1537         return ret;
1538
1539 err2:
1540         *sa_query = NULL;
1541         ib_sa_client_put(query->sa_query.client);
1542         free_mad(&query->sa_query);
1543
1544 err1:
1545         kfree(query);
1546         return ret;
1547 }
1548
1549 /* Support GuidInfoRecord */
1550 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1551                                         int status,
1552                                         struct ib_sa_mad *mad)
1553 {
1554         struct ib_sa_guidinfo_query *query =
1555                 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1556
1557         if (mad) {
1558                 struct ib_sa_guidinfo_rec rec;
1559
1560                 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1561                           mad->data, &rec);
1562                 query->callback(status, &rec, query->context);
1563         } else
1564                 query->callback(status, NULL, query->context);
1565 }
1566
1567 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1568 {
1569         kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1570 }
1571
1572 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1573                               struct ib_device *device, u8 port_num,
1574                               struct ib_sa_guidinfo_rec *rec,
1575                               ib_sa_comp_mask comp_mask, u8 method,
1576                               int timeout_ms, gfp_t gfp_mask,
1577                               void (*callback)(int status,
1578                                                struct ib_sa_guidinfo_rec *resp,
1579                                                void *context),
1580                               void *context,
1581                               struct ib_sa_query **sa_query)
1582 {
1583         struct ib_sa_guidinfo_query *query;
1584         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1585         struct ib_sa_port *port;
1586         struct ib_mad_agent *agent;
1587         struct ib_sa_mad *mad;
1588         int ret;
1589
1590         if (!sa_dev)
1591                 return -ENODEV;
1592
1593         if (method != IB_MGMT_METHOD_GET &&
1594             method != IB_MGMT_METHOD_SET &&
1595             method != IB_SA_METHOD_DELETE) {
1596                 return -EINVAL;
1597         }
1598
1599         port  = &sa_dev->port[port_num - sa_dev->start_port];
1600         agent = port->agent;
1601
1602         query = kzalloc(sizeof(*query), gfp_mask);
1603         if (!query)
1604                 return -ENOMEM;
1605
1606         query->sa_query.port = port;
1607         ret = alloc_mad(&query->sa_query, gfp_mask);
1608         if (ret)
1609                 goto err1;
1610
1611         ib_sa_client_get(client);
1612         query->sa_query.client = client;
1613         query->callback        = callback;
1614         query->context         = context;
1615
1616         mad = query->sa_query.mad_buf->mad;
1617         init_mad(mad, agent);
1618
1619         query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1620         query->sa_query.release  = ib_sa_guidinfo_rec_release;
1621
1622         mad->mad_hdr.method      = method;
1623         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1624         mad->sa_hdr.comp_mask    = comp_mask;
1625
1626         ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1627                 mad->data);
1628
1629         *sa_query = &query->sa_query;
1630
1631         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1632         if (ret < 0)
1633                 goto err2;
1634
1635         return ret;
1636
1637 err2:
1638         *sa_query = NULL;
1639         ib_sa_client_put(query->sa_query.client);
1640         free_mad(&query->sa_query);
1641
1642 err1:
1643         kfree(query);
1644         return ret;
1645 }
1646 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1647
1648 static void send_handler(struct ib_mad_agent *agent,
1649                          struct ib_mad_send_wc *mad_send_wc)
1650 {
1651         struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1652         unsigned long flags;
1653
1654         if (query->callback)
1655                 switch (mad_send_wc->status) {
1656                 case IB_WC_SUCCESS:
1657                         /* No callback -- already got recv */
1658                         break;
1659                 case IB_WC_RESP_TIMEOUT_ERR:
1660                         query->callback(query, -ETIMEDOUT, NULL);
1661                         break;
1662                 case IB_WC_WR_FLUSH_ERR:
1663                         query->callback(query, -EINTR, NULL);
1664                         break;
1665                 default:
1666                         query->callback(query, -EIO, NULL);
1667                         break;
1668                 }
1669
1670         spin_lock_irqsave(&idr_lock, flags);
1671         idr_remove(&query_idr, query->id);
1672         spin_unlock_irqrestore(&idr_lock, flags);
1673
1674         free_mad(query);
1675         ib_sa_client_put(query->client);
1676         query->release(query);
1677 }
1678
1679 static void recv_handler(struct ib_mad_agent *mad_agent,
1680                          struct ib_mad_send_buf *send_buf,
1681                          struct ib_mad_recv_wc *mad_recv_wc)
1682 {
1683         struct ib_sa_query *query;
1684
1685         if (!send_buf)
1686                 return;
1687
1688         query = send_buf->context[0];
1689         if (query->callback) {
1690                 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1691                         query->callback(query,
1692                                         mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1693                                         -EINVAL : 0,
1694                                         (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1695                 else
1696                         query->callback(query, -EIO, NULL);
1697         }
1698
1699         ib_free_recv_mad(mad_recv_wc);
1700 }
1701
1702 static void ib_sa_add_one(struct ib_device *device)
1703 {
1704         struct ib_sa_device *sa_dev;
1705         int s, e, i;
1706         int count = 0;
1707
1708         s = rdma_start_port(device);
1709         e = rdma_end_port(device);
1710
1711         sa_dev = kzalloc(sizeof *sa_dev +
1712                          (e - s + 1) * sizeof (struct ib_sa_port),
1713                          GFP_KERNEL);
1714         if (!sa_dev)
1715                 return;
1716
1717         sa_dev->start_port = s;
1718         sa_dev->end_port   = e;
1719
1720         for (i = 0; i <= e - s; ++i) {
1721                 spin_lock_init(&sa_dev->port[i].ah_lock);
1722                 if (!rdma_cap_ib_sa(device, i + 1))
1723                         continue;
1724
1725                 sa_dev->port[i].sm_ah    = NULL;
1726                 sa_dev->port[i].port_num = i + s;
1727
1728                 sa_dev->port[i].agent =
1729                         ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1730                                               NULL, 0, send_handler,
1731                                               recv_handler, sa_dev, 0);
1732                 if (IS_ERR(sa_dev->port[i].agent))
1733                         goto err;
1734
1735                 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1736
1737                 count++;
1738         }
1739
1740         if (!count)
1741                 goto free;
1742
1743         ib_set_client_data(device, &sa_client, sa_dev);
1744
1745         /*
1746          * We register our event handler after everything is set up,
1747          * and then update our cached info after the event handler is
1748          * registered to avoid any problems if a port changes state
1749          * during our initialization.
1750          */
1751
1752         INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1753         if (ib_register_event_handler(&sa_dev->event_handler))
1754                 goto err;
1755
1756         for (i = 0; i <= e - s; ++i) {
1757                 if (rdma_cap_ib_sa(device, i + 1))
1758                         update_sm_ah(&sa_dev->port[i].update_task);
1759         }
1760
1761         return;
1762
1763 err:
1764         while (--i >= 0) {
1765                 if (rdma_cap_ib_sa(device, i + 1))
1766                         ib_unregister_mad_agent(sa_dev->port[i].agent);
1767         }
1768 free:
1769         kfree(sa_dev);
1770         return;
1771 }
1772
1773 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1774 {
1775         struct ib_sa_device *sa_dev = client_data;
1776         int i;
1777
1778         if (!sa_dev)
1779                 return;
1780
1781         ib_unregister_event_handler(&sa_dev->event_handler);
1782
1783         flush_workqueue(ib_wq);
1784
1785         for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1786                 if (rdma_cap_ib_sa(device, i + 1)) {
1787                         ib_unregister_mad_agent(sa_dev->port[i].agent);
1788                         if (sa_dev->port[i].sm_ah)
1789                                 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1790                 }
1791
1792         }
1793
1794         kfree(sa_dev);
1795 }
1796
1797 static int __init ib_sa_init(void)
1798 {
1799         int ret;
1800
1801         get_random_bytes(&tid, sizeof tid);
1802
1803         atomic_set(&ib_nl_sa_request_seq, 0);
1804
1805         ret = ib_register_client(&sa_client);
1806         if (ret) {
1807                 pr_err("Couldn't register ib_sa client\n");
1808                 goto err1;
1809         }
1810
1811         ret = mcast_init();
1812         if (ret) {
1813                 pr_err("Couldn't initialize multicast handling\n");
1814                 goto err2;
1815         }
1816
1817         ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1818         if (!ib_nl_wq) {
1819                 ret = -ENOMEM;
1820                 goto err3;
1821         }
1822
1823         if (ibnl_add_client(RDMA_NL_LS, ARRAY_SIZE(ib_sa_cb_table),
1824                             ib_sa_cb_table)) {
1825                 pr_err("Failed to add netlink callback\n");
1826                 ret = -EINVAL;
1827                 goto err4;
1828         }
1829         INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1830
1831         return 0;
1832 err4:
1833         destroy_workqueue(ib_nl_wq);
1834 err3:
1835         mcast_cleanup();
1836 err2:
1837         ib_unregister_client(&sa_client);
1838 err1:
1839         return ret;
1840 }
1841
1842 static void __exit ib_sa_cleanup(void)
1843 {
1844         ibnl_remove_client(RDMA_NL_LS);
1845         cancel_delayed_work(&ib_nl_timed_work);
1846         flush_workqueue(ib_nl_wq);
1847         destroy_workqueue(ib_nl_wq);
1848         mcast_cleanup();
1849         ib_unregister_client(&sa_client);
1850         idr_destroy(&query_idr);
1851 }
1852
1853 module_init(ib_sa_init);
1854 module_exit(ib_sa_cleanup);