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 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN             100
  57 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT         2000
  58 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX             200000
  59 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
  60
  61 struct ib_sa_sm_ah {
  62         struct ib_ah        *ah;
  63         struct kref          ref;
  64         u16                  pkey_index;
  65         u8                   src_path_mask;
  66 };
  67
  68 struct ib_sa_port {
  69         struct ib_mad_agent *agent;
  70         struct ib_sa_sm_ah  *sm_ah;
  71         struct work_struct   update_task;
  72         spinlock_t           ah_lock;
  73         u8                   port_num;
  74 };
  75
  76 struct ib_sa_device {
  77         int                     start_port, end_port;
  78         struct ib_event_handler event_handler;
  79         struct ib_sa_port port[0];
  80 };
  81
  82 struct ib_sa_query {
  83         void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
  84         void (*release)(struct ib_sa_query *);
  85         struct ib_sa_client    *client;
  86         struct ib_sa_port      *port;
  87         struct ib_mad_send_buf *mad_buf;
  88         struct ib_sa_sm_ah     *sm_ah;
  89         int                     id;
  90         u32                     flags;
  91         struct list_head        list; /* Local svc request list */
  92         u32                     seq; /* Local svc request sequence number */
  93         unsigned long           timeout; /* Local svc timeout */
  94         u8                      path_use; /* How will the pathrecord be used */
  95 };
  96
  97 #define IB_SA_ENABLE_LOCAL_SERVICE      0x00000001
  98 #define IB_SA_CANCEL                    0x00000002
  99
 100 struct ib_sa_service_query {
 101         void (*callback)(int, struct ib_sa_service_rec *, void *);
 102         void *context;
 103         struct ib_sa_query sa_query;
 104 };
 105
 106 struct ib_sa_path_query {
 107         void (*callback)(int, struct ib_sa_path_rec *, void *);
 108         void *context;
 109         struct ib_sa_query sa_query;
 110 };
 111
 112 struct ib_sa_guidinfo_query {
 113         void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
 114         void *context;
 115         struct ib_sa_query sa_query;
 116 };
 117
 118 struct ib_sa_classport_info_query {
 119         void (*callback)(int, struct ib_class_port_info *, void *);
 120         void *context;
 121         struct ib_sa_query sa_query;
 122 };
 123
 124 struct ib_sa_mcmember_query {
 125         void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
 126         void *context;
 127         struct ib_sa_query sa_query;
 128 };
 129
 130 static LIST_HEAD(ib_nl_request_list);
 131 static DEFINE_SPINLOCK(ib_nl_request_lock);
 132 static atomic_t ib_nl_sa_request_seq;
 133 static struct workqueue_struct *ib_nl_wq;
 134 static struct delayed_work ib_nl_timed_work;
 135 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
 136         [LS_NLA_TYPE_PATH_RECORD]       = {.type = NLA_BINARY,
 137                 .len = sizeof(struct ib_path_rec_data)},
 138         [LS_NLA_TYPE_TIMEOUT]           = {.type = NLA_U32},
 139         [LS_NLA_TYPE_SERVICE_ID]        = {.type = NLA_U64},
 140         [LS_NLA_TYPE_DGID]              = {.type = NLA_BINARY,
 141                 .len = sizeof(struct rdma_nla_ls_gid)},
 142         [LS_NLA_TYPE_SGID]              = {.type = NLA_BINARY,
 143                 .len = sizeof(struct rdma_nla_ls_gid)},
 144         [LS_NLA_TYPE_TCLASS]            = {.type = NLA_U8},
 145         [LS_NLA_TYPE_PKEY]              = {.type = NLA_U16},
 146         [LS_NLA_TYPE_QOS_CLASS]         = {.type = NLA_U16},
 147 };
 148
 149
 150 static void ib_sa_add_one(struct ib_device *device);
 151 static void ib_sa_remove_one(struct ib_device *device, void *client_data);
 152
 153 static struct ib_client sa_client = {
 154         .name   = "sa",
 155         .add    = ib_sa_add_one,
 156         .remove = ib_sa_remove_one
 157 };
 158
 159 static DEFINE_SPINLOCK(idr_lock);
 160 static DEFINE_IDR(query_idr);
 161
 162 static DEFINE_SPINLOCK(tid_lock);
 163 static u32 tid;
 164
 165 #define PATH_REC_FIELD(field) \
 166         .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field),          \
 167         .struct_size_bytes   = sizeof ((struct ib_sa_path_rec *) 0)->field,     \
 168         .field_name          = "sa_path_rec:" #field
 169
 170 static const struct ib_field path_rec_table[] = {
 171         { PATH_REC_FIELD(service_id),
 172           .offset_words = 0,
 173           .offset_bits  = 0,
 174           .size_bits    = 64 },
 175         { PATH_REC_FIELD(dgid),
 176           .offset_words = 2,
 177           .offset_bits  = 0,
 178           .size_bits    = 128 },
 179         { PATH_REC_FIELD(sgid),
 180           .offset_words = 6,
 181           .offset_bits  = 0,
 182           .size_bits    = 128 },
 183         { PATH_REC_FIELD(dlid),
 184           .offset_words = 10,
 185           .offset_bits  = 0,
 186           .size_bits    = 16 },
 187         { PATH_REC_FIELD(slid),
 188           .offset_words = 10,
 189           .offset_bits  = 16,
 190           .size_bits    = 16 },
 191         { PATH_REC_FIELD(raw_traffic),
 192           .offset_words = 11,
 193           .offset_bits  = 0,
 194           .size_bits    = 1 },
 195         { RESERVED,
 196           .offset_words = 11,
 197           .offset_bits  = 1,
 198           .size_bits    = 3 },
 199         { PATH_REC_FIELD(flow_label),
 200           .offset_words = 11,
 201           .offset_bits  = 4,
 202           .size_bits    = 20 },
 203         { PATH_REC_FIELD(hop_limit),
 204           .offset_words = 11,
 205           .offset_bits  = 24,
 206           .size_bits    = 8 },
 207         { PATH_REC_FIELD(traffic_class),
 208           .offset_words = 12,
 209           .offset_bits  = 0,
 210           .size_bits    = 8 },
 211         { PATH_REC_FIELD(reversible),
 212           .offset_words = 12,
 213           .offset_bits  = 8,
 214           .size_bits    = 1 },
 215         { PATH_REC_FIELD(numb_path),
 216           .offset_words = 12,
 217           .offset_bits  = 9,
 218           .size_bits    = 7 },
 219         { PATH_REC_FIELD(pkey),
 220           .offset_words = 12,
 221           .offset_bits  = 16,
 222           .size_bits    = 16 },
 223         { PATH_REC_FIELD(qos_class),
 224           .offset_words = 13,
 225           .offset_bits  = 0,
 226           .size_bits    = 12 },
 227         { PATH_REC_FIELD(sl),
 228           .offset_words = 13,
 229           .offset_bits  = 12,
 230           .size_bits    = 4 },
 231         { PATH_REC_FIELD(mtu_selector),
 232           .offset_words = 13,
 233           .offset_bits  = 16,
 234           .size_bits    = 2 },
 235         { PATH_REC_FIELD(mtu),
 236           .offset_words = 13,
 237           .offset_bits  = 18,
 238           .size_bits    = 6 },
 239         { PATH_REC_FIELD(rate_selector),
 240           .offset_words = 13,
 241           .offset_bits  = 24,
 242           .size_bits    = 2 },
 243         { PATH_REC_FIELD(rate),
 244           .offset_words = 13,
 245           .offset_bits  = 26,
 246           .size_bits    = 6 },
 247         { PATH_REC_FIELD(packet_life_time_selector),
 248           .offset_words = 14,
 249           .offset_bits  = 0,
 250           .size_bits    = 2 },
 251         { PATH_REC_FIELD(packet_life_time),
 252           .offset_words = 14,
 253           .offset_bits  = 2,
 254           .size_bits    = 6 },
 255         { PATH_REC_FIELD(preference),
 256           .offset_words = 14,
 257           .offset_bits  = 8,
 258           .size_bits    = 8 },
 259         { RESERVED,
 260           .offset_words = 14,
 261           .offset_bits  = 16,
 262           .size_bits    = 48 },
 263 };
 264
 265 #define MCMEMBER_REC_FIELD(field) \
 266         .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),      \
 267         .struct_size_bytes   = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
 268         .field_name          = "sa_mcmember_rec:" #field
 269
 270 static const struct ib_field mcmember_rec_table[] = {
 271         { MCMEMBER_REC_FIELD(mgid),
 272           .offset_words = 0,
 273           .offset_bits  = 0,
 274           .size_bits    = 128 },
 275         { MCMEMBER_REC_FIELD(port_gid),
 276           .offset_words = 4,
 277           .offset_bits  = 0,
 278           .size_bits    = 128 },
 279         { MCMEMBER_REC_FIELD(qkey),
 280           .offset_words = 8,
 281           .offset_bits  = 0,
 282           .size_bits    = 32 },
 283         { MCMEMBER_REC_FIELD(mlid),
 284           .offset_words = 9,
 285           .offset_bits  = 0,
 286           .size_bits    = 16 },
 287         { MCMEMBER_REC_FIELD(mtu_selector),
 288           .offset_words = 9,
 289           .offset_bits  = 16,
 290           .size_bits    = 2 },
 291         { MCMEMBER_REC_FIELD(mtu),
 292           .offset_words = 9,
 293           .offset_bits  = 18,
 294           .size_bits    = 6 },
 295         { MCMEMBER_REC_FIELD(traffic_class),
 296           .offset_words = 9,
 297           .offset_bits  = 24,
 298           .size_bits    = 8 },
 299         { MCMEMBER_REC_FIELD(pkey),
 300           .offset_words = 10,
 301           .offset_bits  = 0,
 302           .size_bits    = 16 },
 303         { MCMEMBER_REC_FIELD(rate_selector),
 304           .offset_words = 10,
 305           .offset_bits  = 16,
 306           .size_bits    = 2 },
 307         { MCMEMBER_REC_FIELD(rate),
 308           .offset_words = 10,
 309           .offset_bits  = 18,
 310           .size_bits    = 6 },
 311         { MCMEMBER_REC_FIELD(packet_life_time_selector),
 312           .offset_words = 10,
 313           .offset_bits  = 24,
 314           .size_bits    = 2 },
 315         { MCMEMBER_REC_FIELD(packet_life_time),
 316           .offset_words = 10,
 317           .offset_bits  = 26,
 318           .size_bits    = 6 },
 319         { MCMEMBER_REC_FIELD(sl),
 320           .offset_words = 11,
 321           .offset_bits  = 0,
 322           .size_bits    = 4 },
 323         { MCMEMBER_REC_FIELD(flow_label),
 324           .offset_words = 11,
 325           .offset_bits  = 4,
 326           .size_bits    = 20 },
 327         { MCMEMBER_REC_FIELD(hop_limit),
 328           .offset_words = 11,
 329           .offset_bits  = 24,
 330           .size_bits    = 8 },
 331         { MCMEMBER_REC_FIELD(scope),
 332           .offset_words = 12,
 333           .offset_bits  = 0,
 334           .size_bits    = 4 },
 335         { MCMEMBER_REC_FIELD(join_state),
 336           .offset_words = 12,
 337           .offset_bits  = 4,
 338           .size_bits    = 4 },
 339         { MCMEMBER_REC_FIELD(proxy_join),
 340           .offset_words = 12,
 341           .offset_bits  = 8,
 342           .size_bits    = 1 },
 343         { RESERVED,
 344           .offset_words = 12,
 345           .offset_bits  = 9,
 346           .size_bits    = 23 },
 347 };
 348
 349 #define SERVICE_REC_FIELD(field) \
 350         .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field),       \
 351         .struct_size_bytes   = sizeof ((struct ib_sa_service_rec *) 0)->field,  \
 352         .field_name          = "sa_service_rec:" #field
 353
 354 static const struct ib_field service_rec_table[] = {
 355         { SERVICE_REC_FIELD(id),
 356           .offset_words = 0,
 357           .offset_bits  = 0,
 358           .size_bits    = 64 },
 359         { SERVICE_REC_FIELD(gid),
 360           .offset_words = 2,
 361           .offset_bits  = 0,
 362           .size_bits    = 128 },
 363         { SERVICE_REC_FIELD(pkey),
 364           .offset_words = 6,
 365           .offset_bits  = 0,
 366           .size_bits    = 16 },
 367         { SERVICE_REC_FIELD(lease),
 368           .offset_words = 7,
 369           .offset_bits  = 0,
 370           .size_bits    = 32 },
 371         { SERVICE_REC_FIELD(key),
 372           .offset_words = 8,
 373           .offset_bits  = 0,
 374           .size_bits    = 128 },
 375         { SERVICE_REC_FIELD(name),
 376           .offset_words = 12,
 377           .offset_bits  = 0,
 378           .size_bits    = 64*8 },
 379         { SERVICE_REC_FIELD(data8),
 380           .offset_words = 28,
 381           .offset_bits  = 0,
 382           .size_bits    = 16*8 },
 383         { SERVICE_REC_FIELD(data16),
 384           .offset_words = 32,
 385           .offset_bits  = 0,
 386           .size_bits    = 8*16 },
 387         { SERVICE_REC_FIELD(data32),
 388           .offset_words = 36,
 389           .offset_bits  = 0,
 390           .size_bits    = 4*32 },
 391         { SERVICE_REC_FIELD(data64),
 392           .offset_words = 40,
 393           .offset_bits  = 0,
 394           .size_bits    = 2*64 },
 395 };
 396
 397 #define CLASSPORTINFO_REC_FIELD(field) \
 398         .struct_offset_bytes = offsetof(struct ib_class_port_info, field),      \
 399         .struct_size_bytes   = sizeof((struct ib_class_port_info *)0)->field,   \
 400         .field_name          = "ib_class_port_info:" #field
 401
 402 static const struct ib_field classport_info_rec_table[] = {
 403         { CLASSPORTINFO_REC_FIELD(base_version),
 404           .offset_words = 0,
 405           .offset_bits  = 0,
 406           .size_bits    = 8 },
 407         { CLASSPORTINFO_REC_FIELD(class_version),
 408           .offset_words = 0,
 409           .offset_bits  = 8,
 410           .size_bits    = 8 },
 411         { CLASSPORTINFO_REC_FIELD(capability_mask),
 412           .offset_words = 0,
 413           .offset_bits  = 16,
 414           .size_bits    = 16 },
 415         { CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
 416           .offset_words = 1,
 417           .offset_bits  = 0,
 418           .size_bits    = 32 },
 419         { CLASSPORTINFO_REC_FIELD(redirect_gid),
 420           .offset_words = 2,
 421           .offset_bits  = 0,
 422           .size_bits    = 128 },
 423         { CLASSPORTINFO_REC_FIELD(redirect_tcslfl),
 424           .offset_words = 6,
 425           .offset_bits  = 0,
 426           .size_bits    = 32 },
 427         { CLASSPORTINFO_REC_FIELD(redirect_lid),
 428           .offset_words = 7,
 429           .offset_bits  = 0,
 430           .size_bits    = 16 },
 431         { CLASSPORTINFO_REC_FIELD(redirect_pkey),
 432           .offset_words = 7,
 433           .offset_bits  = 16,
 434           .size_bits    = 16 },
 435
 436         { CLASSPORTINFO_REC_FIELD(redirect_qp),
 437           .offset_words = 8,
 438           .offset_bits  = 0,
 439           .size_bits    = 32 },
 440         { CLASSPORTINFO_REC_FIELD(redirect_qkey),
 441           .offset_words = 9,
 442           .offset_bits  = 0,
 443           .size_bits    = 32 },
 444
 445         { CLASSPORTINFO_REC_FIELD(trap_gid),
 446           .offset_words = 10,
 447           .offset_bits  = 0,
 448           .size_bits    = 128 },
 449         { CLASSPORTINFO_REC_FIELD(trap_tcslfl),
 450           .offset_words = 14,
 451           .offset_bits  = 0,
 452           .size_bits    = 32 },
 453
 454         { CLASSPORTINFO_REC_FIELD(trap_lid),
 455           .offset_words = 15,
 456           .offset_bits  = 0,
 457           .size_bits    = 16 },
 458         { CLASSPORTINFO_REC_FIELD(trap_pkey),
 459           .offset_words = 15,
 460           .offset_bits  = 16,
 461           .size_bits    = 16 },
 462
 463         { CLASSPORTINFO_REC_FIELD(trap_hlqp),
 464           .offset_words = 16,
 465           .offset_bits  = 0,
 466           .size_bits    = 32 },
 467         { CLASSPORTINFO_REC_FIELD(trap_qkey),
 468           .offset_words = 17,
 469           .offset_bits  = 0,
 470           .size_bits    = 32 },
 471 };
 472
 473 #define GUIDINFO_REC_FIELD(field) \
 474         .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field),      \
 475         .struct_size_bytes   = sizeof((struct ib_sa_guidinfo_rec *) 0)->field,  \
 476         .field_name          = "sa_guidinfo_rec:" #field
 477
 478 static const struct ib_field guidinfo_rec_table[] = {
 479         { GUIDINFO_REC_FIELD(lid),
 480           .offset_words = 0,
 481           .offset_bits  = 0,
 482           .size_bits    = 16 },
 483         { GUIDINFO_REC_FIELD(block_num),
 484           .offset_words = 0,
 485           .offset_bits  = 16,
 486           .size_bits    = 8 },
 487         { GUIDINFO_REC_FIELD(res1),
 488           .offset_words = 0,
 489           .offset_bits  = 24,
 490           .size_bits    = 8 },
 491         { GUIDINFO_REC_FIELD(res2),
 492           .offset_words = 1,
 493           .offset_bits  = 0,
 494           .size_bits    = 32 },
 495         { GUIDINFO_REC_FIELD(guid_info_list),
 496           .offset_words = 2,
 497           .offset_bits  = 0,
 498           .size_bits    = 512 },
 499 };
 500
 501 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
 502 {
 503         query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
 504 }
 505
 506 static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
 507 {
 508         return (query->flags & IB_SA_CANCEL);
 509 }
 510
 511 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
 512                                      struct ib_sa_query *query)
 513 {
 514         struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1];
 515         struct ib_sa_mad *mad = query->mad_buf->mad;
 516         ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
 517         u16 val16;
 518         u64 val64;
 519         struct rdma_ls_resolve_header *header;
 520
 521         query->mad_buf->context[1] = NULL;
 522
 523         /* Construct the family header first */
 524         header = (struct rdma_ls_resolve_header *)
 525                 skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 526         memcpy(header->device_name, query->port->agent->device->name,
 527                LS_DEVICE_NAME_MAX);
 528         header->port_num = query->port->port_num;
 529
 530         if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
 531             sa_rec->reversible != 0)
 532                 query->path_use = LS_RESOLVE_PATH_USE_GMP;
 533         else
 534                 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
 535         header->path_use = query->path_use;
 536
 537         /* Now build the attributes */
 538         if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
 539                 val64 = be64_to_cpu(sa_rec->service_id);
 540                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
 541                         sizeof(val64), &val64);
 542         }
 543         if (comp_mask & IB_SA_PATH_REC_DGID)
 544                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
 545                         sizeof(sa_rec->dgid), &sa_rec->dgid);
 546         if (comp_mask & IB_SA_PATH_REC_SGID)
 547                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
 548                         sizeof(sa_rec->sgid), &sa_rec->sgid);
 549         if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
 550                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
 551                         sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
 552
 553         if (comp_mask & IB_SA_PATH_REC_PKEY) {
 554                 val16 = be16_to_cpu(sa_rec->pkey);
 555                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
 556                         sizeof(val16), &val16);
 557         }
 558         if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
 559                 val16 = be16_to_cpu(sa_rec->qos_class);
 560                 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
 561                         sizeof(val16), &val16);
 562         }
 563 }
 564
 565 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
 566 {
 567         int len = 0;
 568
 569         if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
 570                 len += nla_total_size(sizeof(u64));
 571         if (comp_mask & IB_SA_PATH_REC_DGID)
 572                 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
 573         if (comp_mask & IB_SA_PATH_REC_SGID)
 574                 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
 575         if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
 576                 len += nla_total_size(sizeof(u8));
 577         if (comp_mask & IB_SA_PATH_REC_PKEY)
 578                 len += nla_total_size(sizeof(u16));
 579         if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
 580                 len += nla_total_size(sizeof(u16));
 581
 582         /*
 583          * Make sure that at least some of the required comp_mask bits are
 584          * set.
 585          */
 586         if (WARN_ON(len == 0))
 587                 return len;
 588
 589         /* Add the family header */
 590         len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
 591
 592         return len;
 593 }
 594
 595 static int ib_nl_send_msg(struct ib_sa_query *query, gfp_t gfp_mask)
 596 {
 597         struct sk_buff *skb = NULL;
 598         struct nlmsghdr *nlh;
 599         void *data;
 600         int ret = 0;
 601         struct ib_sa_mad *mad;
 602         int len;
 603
 604         mad = query->mad_buf->mad;
 605         len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
 606         if (len <= 0)
 607                 return -EMSGSIZE;
 608
 609         skb = nlmsg_new(len, gfp_mask);
 610         if (!skb)
 611                 return -ENOMEM;
 612
 613         /* Put nlmsg header only for now */
 614         data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
 615                             RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
 616         if (!data) {
 617                 nlmsg_free(skb);
 618                 return -EMSGSIZE;
 619         }
 620
 621         /* Add attributes */
 622         ib_nl_set_path_rec_attrs(skb, query);
 623
 624         /* Repair the nlmsg header length */
 625         nlmsg_end(skb, nlh);
 626
 627         ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, gfp_mask);
 628         if (!ret)
 629                 ret = len;
 630         else
 631                 ret = 0;
 632
 633         return ret;
 634 }
 635
 636 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
 637 {
 638         unsigned long flags;
 639         unsigned long delay;
 640         int ret;
 641
 642         INIT_LIST_HEAD(&query->list);
 643         query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
 644
 645         /* Put the request on the list first.*/
 646         spin_lock_irqsave(&ib_nl_request_lock, flags);
 647         delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
 648         query->timeout = delay + jiffies;
 649         list_add_tail(&query->list, &ib_nl_request_list);
 650         /* Start the timeout if this is the only request */
 651         if (ib_nl_request_list.next == &query->list)
 652                 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
 653         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 654
 655         ret = ib_nl_send_msg(query, gfp_mask);
 656         if (ret <= 0) {
 657                 ret = -EIO;
 658                 /* Remove the request */
 659                 spin_lock_irqsave(&ib_nl_request_lock, flags);
 660                 list_del(&query->list);
 661                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 662         } else {
 663                 ret = 0;
 664         }
 665
 666         return ret;
 667 }
 668
 669 static int ib_nl_cancel_request(struct ib_sa_query *query)
 670 {
 671         unsigned long flags;
 672         struct ib_sa_query *wait_query;
 673         int found = 0;
 674
 675         spin_lock_irqsave(&ib_nl_request_lock, flags);
 676         list_for_each_entry(wait_query, &ib_nl_request_list, list) {
 677                 /* Let the timeout to take care of the callback */
 678                 if (query == wait_query) {
 679                         query->flags |= IB_SA_CANCEL;
 680                         query->timeout = jiffies;
 681                         list_move(&query->list, &ib_nl_request_list);
 682                         found = 1;
 683                         mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
 684                         break;
 685                 }
 686         }
 687         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 688
 689         return found;
 690 }
 691
 692 static void send_handler(struct ib_mad_agent *agent,
 693                          struct ib_mad_send_wc *mad_send_wc);
 694
 695 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
 696                                            const struct nlmsghdr *nlh)
 697 {
 698         struct ib_mad_send_wc mad_send_wc;
 699         struct ib_sa_mad *mad = NULL;
 700         const struct nlattr *head, *curr;
 701         struct ib_path_rec_data  *rec;
 702         int len, rem;
 703         u32 mask = 0;
 704         int status = -EIO;
 705
 706         if (query->callback) {
 707                 head = (const struct nlattr *) nlmsg_data(nlh);
 708                 len = nlmsg_len(nlh);
 709                 switch (query->path_use) {
 710                 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
 711                         mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
 712                         break;
 713
 714                 case LS_RESOLVE_PATH_USE_ALL:
 715                 case LS_RESOLVE_PATH_USE_GMP:
 716                 default:
 717                         mask = IB_PATH_PRIMARY | IB_PATH_GMP |
 718                                 IB_PATH_BIDIRECTIONAL;
 719                         break;
 720                 }
 721                 nla_for_each_attr(curr, head, len, rem) {
 722                         if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
 723                                 rec = nla_data(curr);
 724                                 /*
 725                                  * Get the first one. In the future, we may
 726                                  * need to get up to 6 pathrecords.
 727                                  */
 728                                 if ((rec->flags & mask) == mask) {
 729                                         mad = query->mad_buf->mad;
 730                                         mad->mad_hdr.method |=
 731                                                 IB_MGMT_METHOD_RESP;
 732                                         memcpy(mad->data, rec->path_rec,
 733                                                sizeof(rec->path_rec));
 734                                         status = 0;
 735                                         break;
 736                                 }
 737                         }
 738                 }
 739                 query->callback(query, status, mad);
 740         }
 741
 742         mad_send_wc.send_buf = query->mad_buf;
 743         mad_send_wc.status = IB_WC_SUCCESS;
 744         send_handler(query->mad_buf->mad_agent, &mad_send_wc);
 745 }
 746
 747 static void ib_nl_request_timeout(struct work_struct *work)
 748 {
 749         unsigned long flags;
 750         struct ib_sa_query *query;
 751         unsigned long delay;
 752         struct ib_mad_send_wc mad_send_wc;
 753         int ret;
 754
 755         spin_lock_irqsave(&ib_nl_request_lock, flags);
 756         while (!list_empty(&ib_nl_request_list)) {
 757                 query = list_entry(ib_nl_request_list.next,
 758                                    struct ib_sa_query, list);
 759
 760                 if (time_after(query->timeout, jiffies)) {
 761                         delay = query->timeout - jiffies;
 762                         if ((long)delay <= 0)
 763                                 delay = 1;
 764                         queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
 765                         break;
 766                 }
 767
 768                 list_del(&query->list);
 769                 ib_sa_disable_local_svc(query);
 770                 /* Hold the lock to protect against query cancellation */
 771                 if (ib_sa_query_cancelled(query))
 772                         ret = -1;
 773                 else
 774                         ret = ib_post_send_mad(query->mad_buf, NULL);
 775                 if (ret) {
 776                         mad_send_wc.send_buf = query->mad_buf;
 777                         mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
 778                         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 779                         send_handler(query->port->agent, &mad_send_wc);
 780                         spin_lock_irqsave(&ib_nl_request_lock, flags);
 781                 }
 782         }
 783         spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 784 }
 785
 786 int ib_nl_handle_set_timeout(struct sk_buff *skb,
 787                              struct netlink_callback *cb)
 788 {
 789         const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
 790         int timeout, delta, abs_delta;
 791         const struct nlattr *attr;
 792         unsigned long flags;
 793         struct ib_sa_query *query;
 794         long delay = 0;
 795         struct nlattr *tb[LS_NLA_TYPE_MAX];
 796         int ret;
 797
 798         if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
 799             !(NETLINK_CB(skb).sk) ||
 800             !netlink_capable(skb, CAP_NET_ADMIN))
 801                 return -EPERM;
 802
 803         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
 804                         nlmsg_len(nlh), ib_nl_policy);
 805         attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
 806         if (ret || !attr)
 807                 goto settimeout_out;
 808
 809         timeout = *(int *) nla_data(attr);
 810         if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
 811                 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
 812         if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
 813                 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
 814
 815         delta = timeout - sa_local_svc_timeout_ms;
 816         if (delta < 0)
 817                 abs_delta = -delta;
 818         else
 819                 abs_delta = delta;
 820
 821         if (delta != 0) {
 822                 spin_lock_irqsave(&ib_nl_request_lock, flags);
 823                 sa_local_svc_timeout_ms = timeout;
 824                 list_for_each_entry(query, &ib_nl_request_list, list) {
 825                         if (delta < 0 && abs_delta > query->timeout)
 826                                 query->timeout = 0;
 827                         else
 828                                 query->timeout += delta;
 829
 830                         /* Get the new delay from the first entry */
 831                         if (!delay) {
 832                                 delay = query->timeout - jiffies;
 833                                 if (delay <= 0)
 834                                         delay = 1;
 835                         }
 836                 }
 837                 if (delay)
 838                         mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
 839                                          (unsigned long)delay);
 840                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 841         }
 842
 843 settimeout_out:
 844         return skb->len;
 845 }
 846
 847 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
 848 {
 849         struct nlattr *tb[LS_NLA_TYPE_MAX];
 850         int ret;
 851
 852         if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
 853                 return 0;
 854
 855         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
 856                         nlmsg_len(nlh), ib_nl_policy);
 857         if (ret)
 858                 return 0;
 859
 860         return 1;
 861 }
 862
 863 int ib_nl_handle_resolve_resp(struct sk_buff *skb,
 864                               struct netlink_callback *cb)
 865 {
 866         const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
 867         unsigned long flags;
 868         struct ib_sa_query *query;
 869         struct ib_mad_send_buf *send_buf;
 870         struct ib_mad_send_wc mad_send_wc;
 871         int found = 0;
 872         int ret;
 873
 874         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
 875             !(NETLINK_CB(skb).sk) ||
 876             !netlink_capable(skb, CAP_NET_ADMIN))
 877                 return -EPERM;
 878
 879         spin_lock_irqsave(&ib_nl_request_lock, flags);
 880         list_for_each_entry(query, &ib_nl_request_list, list) {
 881                 /*
 882                  * If the query is cancelled, let the timeout routine
 883                  * take care of it.
 884                  */
 885                 if (nlh->nlmsg_seq == query->seq) {
 886                         found = !ib_sa_query_cancelled(query);
 887                         if (found)
 888                                 list_del(&query->list);
 889                         break;
 890                 }
 891         }
 892
 893         if (!found) {
 894                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 895                 goto resp_out;
 896         }
 897
 898         send_buf = query->mad_buf;
 899
 900         if (!ib_nl_is_good_resolve_resp(nlh)) {
 901                 /* if the result is a failure, send out the packet via IB */
 902                 ib_sa_disable_local_svc(query);
 903                 ret = ib_post_send_mad(query->mad_buf, NULL);
 904                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 905                 if (ret) {
 906                         mad_send_wc.send_buf = send_buf;
 907                         mad_send_wc.status = IB_WC_GENERAL_ERR;
 908                         send_handler(query->port->agent, &mad_send_wc);
 909                 }
 910         } else {
 911                 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
 912                 ib_nl_process_good_resolve_rsp(query, nlh);
 913         }
 914
 915 resp_out:
 916         return skb->len;
 917 }
 918
 919 static void free_sm_ah(struct kref *kref)
 920 {
 921         struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
 922
 923         ib_destroy_ah(sm_ah->ah);
 924         kfree(sm_ah);
 925 }
 926
 927 static void update_sm_ah(struct work_struct *work)
 928 {
 929         struct ib_sa_port *port =
 930                 container_of(work, struct ib_sa_port, update_task);
 931         struct ib_sa_sm_ah *new_ah;
 932         struct ib_port_attr port_attr;
 933         struct ib_ah_attr   ah_attr;
 934
 935         if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
 936                 pr_warn("Couldn't query port\n");
 937                 return;
 938         }
 939
 940         new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
 941         if (!new_ah) {
 942                 return;
 943         }
 944
 945         kref_init(&new_ah->ref);
 946         new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
 947
 948         new_ah->pkey_index = 0;
 949         if (ib_find_pkey(port->agent->device, port->port_num,
 950                          IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
 951                 pr_err("Couldn't find index for default PKey\n");
 952
 953         memset(&ah_attr, 0, sizeof ah_attr);
 954         ah_attr.dlid     = port_attr.sm_lid;
 955         ah_attr.sl       = port_attr.sm_sl;
 956         ah_attr.port_num = port->port_num;
 957         if (port_attr.grh_required) {
 958                 ah_attr.ah_flags = IB_AH_GRH;
 959                 ah_attr.grh.dgid.global.subnet_prefix = cpu_to_be64(port_attr.subnet_prefix);
 960                 ah_attr.grh.dgid.global.interface_id = cpu_to_be64(IB_SA_WELL_KNOWN_GUID);
 961         }
 962
 963         new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
 964         if (IS_ERR(new_ah->ah)) {
 965                 pr_warn("Couldn't create new SM AH\n");
 966                 kfree(new_ah);
 967                 return;
 968         }
 969
 970         spin_lock_irq(&port->ah_lock);
 971         if (port->sm_ah)
 972                 kref_put(&port->sm_ah->ref, free_sm_ah);
 973         port->sm_ah = new_ah;
 974         spin_unlock_irq(&port->ah_lock);
 975
 976 }
 977
 978 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
 979 {
 980         if (event->event == IB_EVENT_PORT_ERR    ||
 981             event->event == IB_EVENT_PORT_ACTIVE ||
 982             event->event == IB_EVENT_LID_CHANGE  ||
 983             event->event == IB_EVENT_PKEY_CHANGE ||
 984             event->event == IB_EVENT_SM_CHANGE   ||
 985             event->event == IB_EVENT_CLIENT_REREGISTER) {
 986                 unsigned long flags;
 987                 struct ib_sa_device *sa_dev =
 988                         container_of(handler, typeof(*sa_dev), event_handler);
 989                 struct ib_sa_port *port =
 990                         &sa_dev->port[event->element.port_num - sa_dev->start_port];
 991
 992                 if (!rdma_cap_ib_sa(handler->device, port->port_num))
 993                         return;
 994
 995                 spin_lock_irqsave(&port->ah_lock, flags);
 996                 if (port->sm_ah)
 997                         kref_put(&port->sm_ah->ref, free_sm_ah);
 998                 port->sm_ah = NULL;
 999                 spin_unlock_irqrestore(&port->ah_lock, flags);
1000
1001                 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
1002                                             sa_dev->start_port].update_task);
1003         }
1004 }
1005
1006 void ib_sa_register_client(struct ib_sa_client *client)
1007 {
1008         atomic_set(&client->users, 1);
1009         init_completion(&client->comp);
1010 }
1011 EXPORT_SYMBOL(ib_sa_register_client);
1012
1013 void ib_sa_unregister_client(struct ib_sa_client *client)
1014 {
1015         ib_sa_client_put(client);
1016         wait_for_completion(&client->comp);
1017 }
1018 EXPORT_SYMBOL(ib_sa_unregister_client);
1019
1020 /**
1021  * ib_sa_cancel_query - try to cancel an SA query
1022  * @id:ID of query to cancel
1023  * @query:query pointer to cancel
1024  *
1025  * Try to cancel an SA query.  If the id and query don't match up or
1026  * the query has already completed, nothing is done.  Otherwise the
1027  * query is canceled and will complete with a status of -EINTR.
1028  */
1029 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
1030 {
1031         unsigned long flags;
1032         struct ib_mad_agent *agent;
1033         struct ib_mad_send_buf *mad_buf;
1034
1035         spin_lock_irqsave(&idr_lock, flags);
1036         if (idr_find(&query_idr, id) != query) {
1037                 spin_unlock_irqrestore(&idr_lock, flags);
1038                 return;
1039         }
1040         agent = query->port->agent;
1041         mad_buf = query->mad_buf;
1042         spin_unlock_irqrestore(&idr_lock, flags);
1043
1044         /*
1045          * If the query is still on the netlink request list, schedule
1046          * it to be cancelled by the timeout routine. Otherwise, it has been
1047          * sent to the MAD layer and has to be cancelled from there.
1048          */
1049         if (!ib_nl_cancel_request(query))
1050                 ib_cancel_mad(agent, mad_buf);
1051 }
1052 EXPORT_SYMBOL(ib_sa_cancel_query);
1053
1054 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
1055 {
1056         struct ib_sa_device *sa_dev;
1057         struct ib_sa_port   *port;
1058         unsigned long flags;
1059         u8 src_path_mask;
1060
1061         sa_dev = ib_get_client_data(device, &sa_client);
1062         if (!sa_dev)
1063                 return 0x7f;
1064
1065         port  = &sa_dev->port[port_num - sa_dev->start_port];
1066         spin_lock_irqsave(&port->ah_lock, flags);
1067         src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
1068         spin_unlock_irqrestore(&port->ah_lock, flags);
1069
1070         return src_path_mask;
1071 }
1072
1073 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
1074                          struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
1075 {
1076         int ret;
1077         u16 gid_index;
1078         int use_roce;
1079         struct net_device *ndev = NULL;
1080
1081         memset(ah_attr, 0, sizeof *ah_attr);
1082         ah_attr->dlid = be16_to_cpu(rec->dlid);
1083         ah_attr->sl = rec->sl;
1084         ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1085                                  get_src_path_mask(device, port_num);
1086         ah_attr->port_num = port_num;
1087         ah_attr->static_rate = rec->rate;
1088
1089         use_roce = rdma_cap_eth_ah(device, port_num);
1090
1091         if (use_roce) {
1092                 struct net_device *idev;
1093                 struct net_device *resolved_dev;
1094                 struct rdma_dev_addr dev_addr = {.bound_dev_if = rec->ifindex,
1095                                                  .net = rec->net ? rec->net :
1096                                                          &init_net};
1097                 union {
1098                         struct sockaddr     _sockaddr;
1099                         struct sockaddr_in  _sockaddr_in;
1100                         struct sockaddr_in6 _sockaddr_in6;
1101                 } sgid_addr, dgid_addr;
1102
1103                 if (!device->get_netdev)
1104                         return -EOPNOTSUPP;
1105
1106                 rdma_gid2ip(&sgid_addr._sockaddr, &rec->sgid);
1107                 rdma_gid2ip(&dgid_addr._sockaddr, &rec->dgid);
1108
1109                 /* validate the route */
1110                 ret = rdma_resolve_ip_route(&sgid_addr._sockaddr,
1111                                             &dgid_addr._sockaddr, &dev_addr);
1112                 if (ret)
1113                         return ret;
1114
1115                 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
1116                      dev_addr.network == RDMA_NETWORK_IPV6) &&
1117                     rec->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
1118                         return -EINVAL;
1119
1120                 idev = device->get_netdev(device, port_num);
1121                 if (!idev)
1122                         return -ENODEV;
1123
1124                 resolved_dev = dev_get_by_index(dev_addr.net,
1125                                                 dev_addr.bound_dev_if);
1126                 if (resolved_dev->flags & IFF_LOOPBACK) {
1127                         dev_put(resolved_dev);
1128                         resolved_dev = idev;
1129                         dev_hold(resolved_dev);
1130                 }
1131                 ndev = ib_get_ndev_from_path(rec);
1132                 rcu_read_lock();
1133                 if ((ndev && ndev != resolved_dev) ||
1134                     (resolved_dev != idev &&
1135                      !rdma_is_upper_dev_rcu(idev, resolved_dev)))
1136                         ret = -EHOSTUNREACH;
1137                 rcu_read_unlock();
1138                 dev_put(idev);
1139                 dev_put(resolved_dev);
1140                 if (ret) {
1141                         if (ndev)
1142                                 dev_put(ndev);
1143                         return ret;
1144                 }
1145         }
1146
1147         if (rec->hop_limit > 0 || use_roce) {
1148                 ah_attr->ah_flags = IB_AH_GRH;
1149                 ah_attr->grh.dgid = rec->dgid;
1150
1151                 ret = ib_find_cached_gid_by_port(device, &rec->sgid,
1152                                                  rec->gid_type, port_num, ndev,
1153                                                  &gid_index);
1154                 if (ret) {
1155                         if (ndev)
1156                                 dev_put(ndev);
1157                         return ret;
1158                 }
1159
1160                 ah_attr->grh.sgid_index    = gid_index;
1161                 ah_attr->grh.flow_label    = be32_to_cpu(rec->flow_label);
1162                 ah_attr->grh.hop_limit     = rec->hop_limit;
1163                 ah_attr->grh.traffic_class = rec->traffic_class;
1164                 if (ndev)
1165                         dev_put(ndev);
1166         }
1167
1168         if (use_roce)
1169                 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1170
1171         return 0;
1172 }
1173 EXPORT_SYMBOL(ib_init_ah_from_path);
1174
1175 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1176 {
1177         unsigned long flags;
1178
1179         spin_lock_irqsave(&query->port->ah_lock, flags);
1180         if (!query->port->sm_ah) {
1181                 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1182                 return -EAGAIN;
1183         }
1184         kref_get(&query->port->sm_ah->ref);
1185         query->sm_ah = query->port->sm_ah;
1186         spin_unlock_irqrestore(&query->port->ah_lock, flags);
1187
1188         query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1189                                             query->sm_ah->pkey_index,
1190                                             0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1191                                             gfp_mask,
1192                                             IB_MGMT_BASE_VERSION);
1193         if (IS_ERR(query->mad_buf)) {
1194                 kref_put(&query->sm_ah->ref, free_sm_ah);
1195                 return -ENOMEM;
1196         }
1197
1198         query->mad_buf->ah = query->sm_ah->ah;
1199
1200         return 0;
1201 }
1202
1203 static void free_mad(struct ib_sa_query *query)
1204 {
1205         ib_free_send_mad(query->mad_buf);
1206         kref_put(&query->sm_ah->ref, free_sm_ah);
1207 }
1208
1209 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1210 {
1211         unsigned long flags;
1212
1213         memset(mad, 0, sizeof *mad);
1214
1215         mad->mad_hdr.base_version  = IB_MGMT_BASE_VERSION;
1216         mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_SUBN_ADM;
1217         mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1218
1219         spin_lock_irqsave(&tid_lock, flags);
1220         mad->mad_hdr.tid           =
1221                 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1222         spin_unlock_irqrestore(&tid_lock, flags);
1223 }
1224
1225 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1226 {
1227         bool preload = gfpflags_allow_blocking(gfp_mask);
1228         unsigned long flags;
1229         int ret, id;
1230
1231         if (preload)
1232                 idr_preload(gfp_mask);
1233         spin_lock_irqsave(&idr_lock, flags);
1234
1235         id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1236
1237         spin_unlock_irqrestore(&idr_lock, flags);
1238         if (preload)
1239                 idr_preload_end();
1240         if (id < 0)
1241                 return id;
1242
1243         query->mad_buf->timeout_ms  = timeout_ms;
1244         query->mad_buf->context[0] = query;
1245         query->id = id;
1246
1247         if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1248                 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1249                         if (!ib_nl_make_request(query, gfp_mask))
1250                                 return id;
1251                 }
1252                 ib_sa_disable_local_svc(query);
1253         }
1254
1255         ret = ib_post_send_mad(query->mad_buf, NULL);
1256         if (ret) {
1257                 spin_lock_irqsave(&idr_lock, flags);
1258                 idr_remove(&query_idr, id);
1259                 spin_unlock_irqrestore(&idr_lock, flags);
1260         }
1261
1262         /*
1263          * It's not safe to dereference query any more, because the
1264          * send may already have completed and freed the query in
1265          * another context.
1266          */
1267         return ret ? ret : id;
1268 }
1269
1270 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1271 {
1272         ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1273 }
1274 EXPORT_SYMBOL(ib_sa_unpack_path);
1275
1276 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1277 {
1278         ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1279 }
1280 EXPORT_SYMBOL(ib_sa_pack_path);
1281
1282 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1283                                     int status,
1284                                     struct ib_sa_mad *mad)
1285 {
1286         struct ib_sa_path_query *query =
1287                 container_of(sa_query, struct ib_sa_path_query, sa_query);
1288
1289         if (mad) {
1290                 struct ib_sa_path_rec rec;
1291
1292                 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1293                           mad->data, &rec);
1294                 rec.net = NULL;
1295                 rec.ifindex = 0;
1296                 rec.gid_type = IB_GID_TYPE_IB;
1297                 eth_zero_addr(rec.dmac);
1298                 query->callback(status, &rec, query->context);
1299         } else
1300                 query->callback(status, NULL, query->context);
1301 }
1302
1303 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1304 {
1305         kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1306 }
1307
1308 /**
1309  * ib_sa_path_rec_get - Start a Path get query
1310  * @client:SA client
1311  * @device:device to send query on
1312  * @port_num: port number to send query on
1313  * @rec:Path Record to send in query
1314  * @comp_mask:component mask to send in query
1315  * @timeout_ms:time to wait for response
1316  * @gfp_mask:GFP mask to use for internal allocations
1317  * @callback:function called when query completes, times out or is
1318  * canceled
1319  * @context:opaque user context passed to callback
1320  * @sa_query:query context, used to cancel query
1321  *
1322  * Send a Path Record Get query to the SA to look up a path.  The
1323  * callback function will be called when the query completes (or
1324  * fails); status is 0 for a successful response, -EINTR if the query
1325  * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1326  * occurred sending the query.  The resp parameter of the callback is
1327  * only valid if status is 0.
1328  *
1329  * If the return value of ib_sa_path_rec_get() is negative, it is an
1330  * error code.  Otherwise it is a query ID that can be used to cancel
1331  * the query.
1332  */
1333 int ib_sa_path_rec_get(struct ib_sa_client *client,
1334                        struct ib_device *device, u8 port_num,
1335                        struct ib_sa_path_rec *rec,
1336                        ib_sa_comp_mask comp_mask,
1337                        int timeout_ms, gfp_t gfp_mask,
1338                        void (*callback)(int status,
1339                                         struct ib_sa_path_rec *resp,
1340                                         void *context),
1341                        void *context,
1342                        struct ib_sa_query **sa_query)
1343 {
1344         struct ib_sa_path_query *query;
1345         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1346         struct ib_sa_port   *port;
1347         struct ib_mad_agent *agent;
1348         struct ib_sa_mad *mad;
1349         int ret;
1350
1351         if (!sa_dev)
1352                 return -ENODEV;
1353
1354         port  = &sa_dev->port[port_num - sa_dev->start_port];
1355         agent = port->agent;
1356
1357         query = kzalloc(sizeof(*query), gfp_mask);
1358         if (!query)
1359                 return -ENOMEM;
1360
1361         query->sa_query.port     = port;
1362         ret = alloc_mad(&query->sa_query, gfp_mask);
1363         if (ret)
1364                 goto err1;
1365
1366         ib_sa_client_get(client);
1367         query->sa_query.client = client;
1368         query->callback        = callback;
1369         query->context         = context;
1370
1371         mad = query->sa_query.mad_buf->mad;
1372         init_mad(mad, agent);
1373
1374         query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1375         query->sa_query.release  = ib_sa_path_rec_release;
1376         mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
1377         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1378         mad->sa_hdr.comp_mask    = comp_mask;
1379
1380         ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1381
1382         *sa_query = &query->sa_query;
1383
1384         query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1385         query->sa_query.mad_buf->context[1] = rec;
1386
1387         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1388         if (ret < 0)
1389                 goto err2;
1390
1391         return ret;
1392
1393 err2:
1394         *sa_query = NULL;
1395         ib_sa_client_put(query->sa_query.client);
1396         free_mad(&query->sa_query);
1397
1398 err1:
1399         kfree(query);
1400         return ret;
1401 }
1402 EXPORT_SYMBOL(ib_sa_path_rec_get);
1403
1404 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1405                                     int status,
1406                                     struct ib_sa_mad *mad)
1407 {
1408         struct ib_sa_service_query *query =
1409                 container_of(sa_query, struct ib_sa_service_query, sa_query);
1410
1411         if (mad) {
1412                 struct ib_sa_service_rec rec;
1413
1414                 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1415                           mad->data, &rec);
1416                 query->callback(status, &rec, query->context);
1417         } else
1418                 query->callback(status, NULL, query->context);
1419 }
1420
1421 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1422 {
1423         kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1424 }
1425
1426 /**
1427  * ib_sa_service_rec_query - Start Service Record operation
1428  * @client:SA client
1429  * @device:device to send request on
1430  * @port_num: port number to send request on
1431  * @method:SA method - should be get, set, or delete
1432  * @rec:Service Record to send in request
1433  * @comp_mask:component mask to send in request
1434  * @timeout_ms:time to wait for response
1435  * @gfp_mask:GFP mask to use for internal allocations
1436  * @callback:function called when request completes, times out or is
1437  * canceled
1438  * @context:opaque user context passed to callback
1439  * @sa_query:request context, used to cancel request
1440  *
1441  * Send a Service Record set/get/delete to the SA to register,
1442  * unregister or query a service record.
1443  * The callback function will be called when the request completes (or
1444  * fails); status is 0 for a successful response, -EINTR if the query
1445  * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1446  * occurred sending the query.  The resp parameter of the callback is
1447  * only valid if status is 0.
1448  *
1449  * If the return value of ib_sa_service_rec_query() is negative, it is an
1450  * error code.  Otherwise it is a request ID that can be used to cancel
1451  * the query.
1452  */
1453 int ib_sa_service_rec_query(struct ib_sa_client *client,
1454                             struct ib_device *device, u8 port_num, u8 method,
1455                             struct ib_sa_service_rec *rec,
1456                             ib_sa_comp_mask comp_mask,
1457                             int timeout_ms, gfp_t gfp_mask,
1458                             void (*callback)(int status,
1459                                              struct ib_sa_service_rec *resp,
1460                                              void *context),
1461                             void *context,
1462                             struct ib_sa_query **sa_query)
1463 {
1464         struct ib_sa_service_query *query;
1465         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1466         struct ib_sa_port   *port;
1467         struct ib_mad_agent *agent;
1468         struct ib_sa_mad *mad;
1469         int ret;
1470
1471         if (!sa_dev)
1472                 return -ENODEV;
1473
1474         port  = &sa_dev->port[port_num - sa_dev->start_port];
1475         agent = port->agent;
1476
1477         if (method != IB_MGMT_METHOD_GET &&
1478             method != IB_MGMT_METHOD_SET &&
1479             method != IB_SA_METHOD_DELETE)
1480                 return -EINVAL;
1481
1482         query = kzalloc(sizeof(*query), gfp_mask);
1483         if (!query)
1484                 return -ENOMEM;
1485
1486         query->sa_query.port     = port;
1487         ret = alloc_mad(&query->sa_query, gfp_mask);
1488         if (ret)
1489                 goto err1;
1490
1491         ib_sa_client_get(client);
1492         query->sa_query.client = client;
1493         query->callback        = callback;
1494         query->context         = context;
1495
1496         mad = query->sa_query.mad_buf->mad;
1497         init_mad(mad, agent);
1498
1499         query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1500         query->sa_query.release  = ib_sa_service_rec_release;
1501         mad->mad_hdr.method      = method;
1502         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1503         mad->sa_hdr.comp_mask    = comp_mask;
1504
1505         ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1506                 rec, mad->data);
1507
1508         *sa_query = &query->sa_query;
1509
1510         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1511         if (ret < 0)
1512                 goto err2;
1513
1514         return ret;
1515
1516 err2:
1517         *sa_query = NULL;
1518         ib_sa_client_put(query->sa_query.client);
1519         free_mad(&query->sa_query);
1520
1521 err1:
1522         kfree(query);
1523         return ret;
1524 }
1525 EXPORT_SYMBOL(ib_sa_service_rec_query);
1526
1527 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1528                                         int status,
1529                                         struct ib_sa_mad *mad)
1530 {
1531         struct ib_sa_mcmember_query *query =
1532                 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1533
1534         if (mad) {
1535                 struct ib_sa_mcmember_rec rec;
1536
1537                 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1538                           mad->data, &rec);
1539                 query->callback(status, &rec, query->context);
1540         } else
1541                 query->callback(status, NULL, query->context);
1542 }
1543
1544 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1545 {
1546         kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1547 }
1548
1549 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1550                              struct ib_device *device, u8 port_num,
1551                              u8 method,
1552                              struct ib_sa_mcmember_rec *rec,
1553                              ib_sa_comp_mask comp_mask,
1554                              int timeout_ms, gfp_t gfp_mask,
1555                              void (*callback)(int status,
1556                                               struct ib_sa_mcmember_rec *resp,
1557                                               void *context),
1558                              void *context,
1559                              struct ib_sa_query **sa_query)
1560 {
1561         struct ib_sa_mcmember_query *query;
1562         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1563         struct ib_sa_port   *port;
1564         struct ib_mad_agent *agent;
1565         struct ib_sa_mad *mad;
1566         int ret;
1567
1568         if (!sa_dev)
1569                 return -ENODEV;
1570
1571         port  = &sa_dev->port[port_num - sa_dev->start_port];
1572         agent = port->agent;
1573
1574         query = kzalloc(sizeof(*query), gfp_mask);
1575         if (!query)
1576                 return -ENOMEM;
1577
1578         query->sa_query.port     = port;
1579         ret = alloc_mad(&query->sa_query, gfp_mask);
1580         if (ret)
1581                 goto err1;
1582
1583         ib_sa_client_get(client);
1584         query->sa_query.client = client;
1585         query->callback        = callback;
1586         query->context         = context;
1587
1588         mad = query->sa_query.mad_buf->mad;
1589         init_mad(mad, agent);
1590
1591         query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1592         query->sa_query.release  = ib_sa_mcmember_rec_release;
1593         mad->mad_hdr.method      = method;
1594         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1595         mad->sa_hdr.comp_mask    = comp_mask;
1596
1597         ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1598                 rec, mad->data);
1599
1600         *sa_query = &query->sa_query;
1601
1602         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1603         if (ret < 0)
1604                 goto err2;
1605
1606         return ret;
1607
1608 err2:
1609         *sa_query = NULL;
1610         ib_sa_client_put(query->sa_query.client);
1611         free_mad(&query->sa_query);
1612
1613 err1:
1614         kfree(query);
1615         return ret;
1616 }
1617
1618 /* Support GuidInfoRecord */
1619 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1620                                         int status,
1621                                         struct ib_sa_mad *mad)
1622 {
1623         struct ib_sa_guidinfo_query *query =
1624                 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1625
1626         if (mad) {
1627                 struct ib_sa_guidinfo_rec rec;
1628
1629                 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1630                           mad->data, &rec);
1631                 query->callback(status, &rec, query->context);
1632         } else
1633                 query->callback(status, NULL, query->context);
1634 }
1635
1636 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1637 {
1638         kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1639 }
1640
1641 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1642                               struct ib_device *device, u8 port_num,
1643                               struct ib_sa_guidinfo_rec *rec,
1644                               ib_sa_comp_mask comp_mask, u8 method,
1645                               int timeout_ms, gfp_t gfp_mask,
1646                               void (*callback)(int status,
1647                                                struct ib_sa_guidinfo_rec *resp,
1648                                                void *context),
1649                               void *context,
1650                               struct ib_sa_query **sa_query)
1651 {
1652         struct ib_sa_guidinfo_query *query;
1653         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1654         struct ib_sa_port *port;
1655         struct ib_mad_agent *agent;
1656         struct ib_sa_mad *mad;
1657         int ret;
1658
1659         if (!sa_dev)
1660                 return -ENODEV;
1661
1662         if (method != IB_MGMT_METHOD_GET &&
1663             method != IB_MGMT_METHOD_SET &&
1664             method != IB_SA_METHOD_DELETE) {
1665                 return -EINVAL;
1666         }
1667
1668         port  = &sa_dev->port[port_num - sa_dev->start_port];
1669         agent = port->agent;
1670
1671         query = kzalloc(sizeof(*query), gfp_mask);
1672         if (!query)
1673                 return -ENOMEM;
1674
1675         query->sa_query.port = port;
1676         ret = alloc_mad(&query->sa_query, gfp_mask);
1677         if (ret)
1678                 goto err1;
1679
1680         ib_sa_client_get(client);
1681         query->sa_query.client = client;
1682         query->callback        = callback;
1683         query->context         = context;
1684
1685         mad = query->sa_query.mad_buf->mad;
1686         init_mad(mad, agent);
1687
1688         query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1689         query->sa_query.release  = ib_sa_guidinfo_rec_release;
1690
1691         mad->mad_hdr.method      = method;
1692         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1693         mad->sa_hdr.comp_mask    = comp_mask;
1694
1695         ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1696                 mad->data);
1697
1698         *sa_query = &query->sa_query;
1699
1700         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1701         if (ret < 0)
1702                 goto err2;
1703
1704         return ret;
1705
1706 err2:
1707         *sa_query = NULL;
1708         ib_sa_client_put(query->sa_query.client);
1709         free_mad(&query->sa_query);
1710
1711 err1:
1712         kfree(query);
1713         return ret;
1714 }
1715 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1716
1717 /* Support get SA ClassPortInfo */
1718 static void ib_sa_classport_info_rec_callback(struct ib_sa_query *sa_query,
1719                                               int status,
1720                                               struct ib_sa_mad *mad)
1721 {
1722         struct ib_sa_classport_info_query *query =
1723                 container_of(sa_query, struct ib_sa_classport_info_query, sa_query);
1724
1725         if (mad) {
1726                 struct ib_class_port_info rec;
1727
1728                 ib_unpack(classport_info_rec_table,
1729                           ARRAY_SIZE(classport_info_rec_table),
1730                           mad->data, &rec);
1731                 query->callback(status, &rec, query->context);
1732         } else {
1733                 query->callback(status, NULL, query->context);
1734         }
1735 }
1736
1737 static void ib_sa_portclass_info_rec_release(struct ib_sa_query *sa_query)
1738 {
1739         kfree(container_of(sa_query, struct ib_sa_classport_info_query,
1740                            sa_query));
1741 }
1742
1743 int ib_sa_classport_info_rec_query(struct ib_sa_client *client,
1744                                    struct ib_device *device, u8 port_num,
1745                                    int timeout_ms, gfp_t gfp_mask,
1746                                    void (*callback)(int status,
1747                                                     struct ib_class_port_info *resp,
1748                                                     void *context),
1749                                    void *context,
1750                                    struct ib_sa_query **sa_query)
1751 {
1752         struct ib_sa_classport_info_query *query;
1753         struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1754         struct ib_sa_port *port;
1755         struct ib_mad_agent *agent;
1756         struct ib_sa_mad *mad;
1757         int ret;
1758
1759         if (!sa_dev)
1760                 return -ENODEV;
1761
1762         port  = &sa_dev->port[port_num - sa_dev->start_port];
1763         agent = port->agent;
1764
1765         query = kzalloc(sizeof(*query), gfp_mask);
1766         if (!query)
1767                 return -ENOMEM;
1768
1769         query->sa_query.port = port;
1770         ret = alloc_mad(&query->sa_query, gfp_mask);
1771         if (ret)
1772                 goto err1;
1773
1774         ib_sa_client_get(client);
1775         query->sa_query.client = client;
1776         query->callback        = callback;
1777         query->context         = context;
1778
1779         mad = query->sa_query.mad_buf->mad;
1780         init_mad(mad, agent);
1781
1782         query->sa_query.callback = callback ? ib_sa_classport_info_rec_callback : NULL;
1783
1784         query->sa_query.release  = ib_sa_portclass_info_rec_release;
1785         /* support GET only */
1786         mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
1787         mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_CLASS_PORTINFO);
1788         mad->sa_hdr.comp_mask    = 0;
1789         *sa_query = &query->sa_query;
1790
1791         ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1792         if (ret < 0)
1793                 goto err2;
1794
1795         return ret;
1796
1797 err2:
1798         *sa_query = NULL;
1799         ib_sa_client_put(query->sa_query.client);
1800         free_mad(&query->sa_query);
1801
1802 err1:
1803         kfree(query);
1804         return ret;
1805 }
1806 EXPORT_SYMBOL(ib_sa_classport_info_rec_query);
1807
1808 static void send_handler(struct ib_mad_agent *agent,
1809                          struct ib_mad_send_wc *mad_send_wc)
1810 {
1811         struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1812         unsigned long flags;
1813
1814         if (query->callback)
1815                 switch (mad_send_wc->status) {
1816                 case IB_WC_SUCCESS:
1817                         /* No callback -- already got recv */
1818                         break;
1819                 case IB_WC_RESP_TIMEOUT_ERR:
1820                         query->callback(query, -ETIMEDOUT, NULL);
1821                         break;
1822                 case IB_WC_WR_FLUSH_ERR:
1823                         query->callback(query, -EINTR, NULL);
1824                         break;
1825                 default:
1826                         query->callback(query, -EIO, NULL);
1827                         break;
1828                 }
1829
1830         spin_lock_irqsave(&idr_lock, flags);
1831         idr_remove(&query_idr, query->id);
1832         spin_unlock_irqrestore(&idr_lock, flags);
1833
1834         free_mad(query);
1835         ib_sa_client_put(query->client);
1836         query->release(query);
1837 }
1838
1839 static void recv_handler(struct ib_mad_agent *mad_agent,
1840                          struct ib_mad_send_buf *send_buf,
1841                          struct ib_mad_recv_wc *mad_recv_wc)
1842 {
1843         struct ib_sa_query *query;
1844
1845         if (!send_buf)
1846                 return;
1847
1848         query = send_buf->context[0];
1849         if (query->callback) {
1850                 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1851                         query->callback(query,
1852                                         mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1853                                         -EINVAL : 0,
1854                                         (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1855                 else
1856                         query->callback(query, -EIO, NULL);
1857         }
1858
1859         ib_free_recv_mad(mad_recv_wc);
1860 }
1861
1862 static void ib_sa_add_one(struct ib_device *device)
1863 {
1864         struct ib_sa_device *sa_dev;
1865         int s, e, i;
1866         int count = 0;
1867
1868         s = rdma_start_port(device);
1869         e = rdma_end_port(device);
1870
1871         sa_dev = kzalloc(sizeof *sa_dev +
1872                          (e - s + 1) * sizeof (struct ib_sa_port),
1873                          GFP_KERNEL);
1874         if (!sa_dev)
1875                 return;
1876
1877         sa_dev->start_port = s;
1878         sa_dev->end_port   = e;
1879
1880         for (i = 0; i <= e - s; ++i) {
1881                 spin_lock_init(&sa_dev->port[i].ah_lock);
1882                 if (!rdma_cap_ib_sa(device, i + 1))
1883                         continue;
1884
1885                 sa_dev->port[i].sm_ah    = NULL;
1886                 sa_dev->port[i].port_num = i + s;
1887
1888                 sa_dev->port[i].agent =
1889                         ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1890                                               NULL, 0, send_handler,
1891                                               recv_handler, sa_dev, 0);
1892                 if (IS_ERR(sa_dev->port[i].agent))
1893                         goto err;
1894
1895                 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1896
1897                 count++;
1898         }
1899
1900         if (!count)
1901                 goto free;
1902
1903         ib_set_client_data(device, &sa_client, sa_dev);
1904
1905         /*
1906          * We register our event handler after everything is set up,
1907          * and then update our cached info after the event handler is
1908          * registered to avoid any problems if a port changes state
1909          * during our initialization.
1910          */
1911
1912         INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1913         if (ib_register_event_handler(&sa_dev->event_handler))
1914                 goto err;
1915
1916         for (i = 0; i <= e - s; ++i) {
1917                 if (rdma_cap_ib_sa(device, i + 1))
1918                         update_sm_ah(&sa_dev->port[i].update_task);
1919         }
1920
1921         return;
1922
1923 err:
1924         while (--i >= 0) {
1925                 if (rdma_cap_ib_sa(device, i + 1))
1926                         ib_unregister_mad_agent(sa_dev->port[i].agent);
1927         }
1928 free:
1929         kfree(sa_dev);
1930         return;
1931 }
1932
1933 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1934 {
1935         struct ib_sa_device *sa_dev = client_data;
1936         int i;
1937
1938         if (!sa_dev)
1939                 return;
1940
1941         ib_unregister_event_handler(&sa_dev->event_handler);
1942
1943         flush_workqueue(ib_wq);
1944
1945         for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1946                 if (rdma_cap_ib_sa(device, i + 1)) {
1947                         ib_unregister_mad_agent(sa_dev->port[i].agent);
1948                         if (sa_dev->port[i].sm_ah)
1949                                 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1950                 }
1951
1952         }
1953
1954         kfree(sa_dev);
1955 }
1956
1957 int ib_sa_init(void)
1958 {
1959         int ret;
1960
1961         get_random_bytes(&tid, sizeof tid);
1962
1963         atomic_set(&ib_nl_sa_request_seq, 0);
1964
1965         ret = ib_register_client(&sa_client);
1966         if (ret) {
1967                 pr_err("Couldn't register ib_sa client\n");
1968                 goto err1;
1969         }
1970
1971         ret = mcast_init();
1972         if (ret) {
1973                 pr_err("Couldn't initialize multicast handling\n");
1974                 goto err2;
1975         }
1976
1977         ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1978         if (!ib_nl_wq) {
1979                 ret = -ENOMEM;
1980                 goto err3;
1981         }
1982
1983         INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1984
1985         return 0;
1986
1987 err3:
1988         mcast_cleanup();
1989 err2:
1990         ib_unregister_client(&sa_client);
1991 err1:
1992         return ret;
1993 }
1994
1995 void ib_sa_cleanup(void)
1996 {
1997         cancel_delayed_work(&ib_nl_timed_work);
1998         flush_workqueue(ib_nl_wq);
1999         destroy_workqueue(ib_nl_wq);
2000         mcast_cleanup();
2001         ib_unregister_client(&sa_client);
2002         idr_destroy(&query_idr);
2003 }