linux/drivers/infiniband/core/sa_query.c
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   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
  46#include <rdma/ib_pack.h>
  47#include <rdma/ib_cache.h>
  48#include "sa.h"
  49
  50MODULE_AUTHOR("Roland Dreier");
  51MODULE_DESCRIPTION("InfiniBand subnet administration query support");
  52MODULE_LICENSE("Dual BSD/GPL");
  53
  54struct ib_sa_sm_ah {
  55        struct ib_ah        *ah;
  56        struct kref          ref;
  57        u16                  pkey_index;
  58        u8                   src_path_mask;
  59};
  60
  61struct ib_sa_port {
  62        struct ib_mad_agent *agent;
  63        struct ib_sa_sm_ah  *sm_ah;
  64        struct work_struct   update_task;
  65        spinlock_t           ah_lock;
  66        u8                   port_num;
  67};
  68
  69struct ib_sa_device {
  70        int                     start_port, end_port;
  71        struct ib_event_handler event_handler;
  72        struct ib_sa_port port[0];
  73};
  74
  75struct ib_sa_query {
  76        void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
  77        void (*release)(struct ib_sa_query *);
  78        struct ib_sa_client    *client;
  79        struct ib_sa_port      *port;
  80        struct ib_mad_send_buf *mad_buf;
  81        struct ib_sa_sm_ah     *sm_ah;
  82        int                     id;
  83};
  84
  85struct ib_sa_service_query {
  86        void (*callback)(int, struct ib_sa_service_rec *, void *);
  87        void *context;
  88        struct ib_sa_query sa_query;
  89};
  90
  91struct ib_sa_path_query {
  92        void (*callback)(int, struct ib_sa_path_rec *, void *);
  93        void *context;
  94        struct ib_sa_query sa_query;
  95};
  96
  97struct ib_sa_mcmember_query {
  98        void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
  99        void *context;
 100        struct ib_sa_query sa_query;
 101};
 102
 103static void ib_sa_add_one(struct ib_device *device);
 104static void ib_sa_remove_one(struct ib_device *device);
 105
 106static struct ib_client sa_client = {
 107        .name   = "sa",
 108        .add    = ib_sa_add_one,
 109        .remove = ib_sa_remove_one
 110};
 111
 112static spinlock_t idr_lock;
 113static DEFINE_IDR(query_idr);
 114
 115static spinlock_t tid_lock;
 116static u32 tid;
 117
 118#define PATH_REC_FIELD(field) \
 119        .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field),          \
 120        .struct_size_bytes   = sizeof ((struct ib_sa_path_rec *) 0)->field,     \
 121        .field_name          = "sa_path_rec:" #field
 122
 123static const struct ib_field path_rec_table[] = {
 124        { PATH_REC_FIELD(service_id),
 125          .offset_words = 0,
 126          .offset_bits  = 0,
 127          .size_bits    = 64 },
 128        { PATH_REC_FIELD(dgid),
 129          .offset_words = 2,
 130          .offset_bits  = 0,
 131          .size_bits    = 128 },
 132        { PATH_REC_FIELD(sgid),
 133          .offset_words = 6,
 134          .offset_bits  = 0,
 135          .size_bits    = 128 },
 136        { PATH_REC_FIELD(dlid),
 137          .offset_words = 10,
 138          .offset_bits  = 0,
 139          .size_bits    = 16 },
 140        { PATH_REC_FIELD(slid),
 141          .offset_words = 10,
 142          .offset_bits  = 16,
 143          .size_bits    = 16 },
 144        { PATH_REC_FIELD(raw_traffic),
 145          .offset_words = 11,
 146          .offset_bits  = 0,
 147          .size_bits    = 1 },
 148        { RESERVED,
 149          .offset_words = 11,
 150          .offset_bits  = 1,
 151          .size_bits    = 3 },
 152        { PATH_REC_FIELD(flow_label),
 153          .offset_words = 11,
 154          .offset_bits  = 4,
 155          .size_bits    = 20 },
 156        { PATH_REC_FIELD(hop_limit),
 157          .offset_words = 11,
 158          .offset_bits  = 24,
 159          .size_bits    = 8 },
 160        { PATH_REC_FIELD(traffic_class),
 161          .offset_words = 12,
 162          .offset_bits  = 0,
 163          .size_bits    = 8 },
 164        { PATH_REC_FIELD(reversible),
 165          .offset_words = 12,
 166          .offset_bits  = 8,
 167          .size_bits    = 1 },
 168        { PATH_REC_FIELD(numb_path),
 169          .offset_words = 12,
 170          .offset_bits  = 9,
 171          .size_bits    = 7 },
 172        { PATH_REC_FIELD(pkey),
 173          .offset_words = 12,
 174          .offset_bits  = 16,
 175          .size_bits    = 16 },
 176        { PATH_REC_FIELD(qos_class),
 177          .offset_words = 13,
 178          .offset_bits  = 0,
 179          .size_bits    = 12 },
 180        { PATH_REC_FIELD(sl),
 181          .offset_words = 13,
 182          .offset_bits  = 12,
 183          .size_bits    = 4 },
 184        { PATH_REC_FIELD(mtu_selector),
 185          .offset_words = 13,
 186          .offset_bits  = 16,
 187          .size_bits    = 2 },
 188        { PATH_REC_FIELD(mtu),
 189          .offset_words = 13,
 190          .offset_bits  = 18,
 191          .size_bits    = 6 },
 192        { PATH_REC_FIELD(rate_selector),
 193          .offset_words = 13,
 194          .offset_bits  = 24,
 195          .size_bits    = 2 },
 196        { PATH_REC_FIELD(rate),
 197          .offset_words = 13,
 198          .offset_bits  = 26,
 199          .size_bits    = 6 },
 200        { PATH_REC_FIELD(packet_life_time_selector),
 201          .offset_words = 14,
 202          .offset_bits  = 0,
 203          .size_bits    = 2 },
 204        { PATH_REC_FIELD(packet_life_time),
 205          .offset_words = 14,
 206          .offset_bits  = 2,
 207          .size_bits    = 6 },
 208        { PATH_REC_FIELD(preference),
 209          .offset_words = 14,
 210          .offset_bits  = 8,
 211          .size_bits    = 8 },
 212        { RESERVED,
 213          .offset_words = 14,
 214          .offset_bits  = 16,
 215          .size_bits    = 48 },
 216};
 217
 218#define MCMEMBER_REC_FIELD(field) \
 219        .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),      \
 220        .struct_size_bytes   = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
 221        .field_name          = "sa_mcmember_rec:" #field
 222
 223static const struct ib_field mcmember_rec_table[] = {
 224        { MCMEMBER_REC_FIELD(mgid),
 225          .offset_words = 0,
 226          .offset_bits  = 0,
 227          .size_bits    = 128 },
 228        { MCMEMBER_REC_FIELD(port_gid),
 229          .offset_words = 4,
 230          .offset_bits  = 0,
 231          .size_bits    = 128 },
 232        { MCMEMBER_REC_FIELD(qkey),
 233          .offset_words = 8,
 234          .offset_bits  = 0,
 235          .size_bits    = 32 },
 236        { MCMEMBER_REC_FIELD(mlid),
 237          .offset_words = 9,
 238          .offset_bits  = 0,
 239          .size_bits    = 16 },
 240        { MCMEMBER_REC_FIELD(mtu_selector),
 241          .offset_words = 9,
 242          .offset_bits  = 16,
 243          .size_bits    = 2 },
 244        { MCMEMBER_REC_FIELD(mtu),
 245          .offset_words = 9,
 246          .offset_bits  = 18,
 247          .size_bits    = 6 },
 248        { MCMEMBER_REC_FIELD(traffic_class),
 249          .offset_words = 9,
 250          .offset_bits  = 24,
 251          .size_bits    = 8 },
 252        { MCMEMBER_REC_FIELD(pkey),
 253          .offset_words = 10,
 254          .offset_bits  = 0,
 255          .size_bits    = 16 },
 256        { MCMEMBER_REC_FIELD(rate_selector),
 257          .offset_words = 10,
 258          .offset_bits  = 16,
 259          .size_bits    = 2 },
 260        { MCMEMBER_REC_FIELD(rate),
 261          .offset_words = 10,
 262          .offset_bits  = 18,
 263          .size_bits    = 6 },
 264        { MCMEMBER_REC_FIELD(packet_life_time_selector),
 265          .offset_words = 10,
 266          .offset_bits  = 24,
 267          .size_bits    = 2 },
 268        { MCMEMBER_REC_FIELD(packet_life_time),
 269          .offset_words = 10,
 270          .offset_bits  = 26,
 271          .size_bits    = 6 },
 272        { MCMEMBER_REC_FIELD(sl),
 273          .offset_words = 11,
 274          .offset_bits  = 0,
 275          .size_bits    = 4 },
 276        { MCMEMBER_REC_FIELD(flow_label),
 277          .offset_words = 11,
 278          .offset_bits  = 4,
 279          .size_bits    = 20 },
 280        { MCMEMBER_REC_FIELD(hop_limit),
 281          .offset_words = 11,
 282          .offset_bits  = 24,
 283          .size_bits    = 8 },
 284        { MCMEMBER_REC_FIELD(scope),
 285          .offset_words = 12,
 286          .offset_bits  = 0,
 287          .size_bits    = 4 },
 288        { MCMEMBER_REC_FIELD(join_state),
 289          .offset_words = 12,
 290          .offset_bits  = 4,
 291          .size_bits    = 4 },
 292        { MCMEMBER_REC_FIELD(proxy_join),
 293          .offset_words = 12,
 294          .offset_bits  = 8,
 295          .size_bits    = 1 },
 296        { RESERVED,
 297          .offset_words = 12,
 298          .offset_bits  = 9,
 299          .size_bits    = 23 },
 300};
 301
 302#define SERVICE_REC_FIELD(field) \
 303        .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field),       \
 304        .struct_size_bytes   = sizeof ((struct ib_sa_service_rec *) 0)->field,  \
 305        .field_name          = "sa_service_rec:" #field
 306
 307static const struct ib_field service_rec_table[] = {
 308        { SERVICE_REC_FIELD(id),
 309          .offset_words = 0,
 310          .offset_bits  = 0,
 311          .size_bits    = 64 },
 312        { SERVICE_REC_FIELD(gid),
 313          .offset_words = 2,
 314          .offset_bits  = 0,
 315          .size_bits    = 128 },
 316        { SERVICE_REC_FIELD(pkey),
 317          .offset_words = 6,
 318          .offset_bits  = 0,
 319          .size_bits    = 16 },
 320        { SERVICE_REC_FIELD(lease),
 321          .offset_words = 7,
 322          .offset_bits  = 0,
 323          .size_bits    = 32 },
 324        { SERVICE_REC_FIELD(key),
 325          .offset_words = 8,
 326          .offset_bits  = 0,
 327          .size_bits    = 128 },
 328        { SERVICE_REC_FIELD(name),
 329          .offset_words = 12,
 330          .offset_bits  = 0,
 331          .size_bits    = 64*8 },
 332        { SERVICE_REC_FIELD(data8),
 333          .offset_words = 28,
 334          .offset_bits  = 0,
 335          .size_bits    = 16*8 },
 336        { SERVICE_REC_FIELD(data16),
 337          .offset_words = 32,
 338          .offset_bits  = 0,
 339          .size_bits    = 8*16 },
 340        { SERVICE_REC_FIELD(data32),
 341          .offset_words = 36,
 342          .offset_bits  = 0,
 343          .size_bits    = 4*32 },
 344        { SERVICE_REC_FIELD(data64),
 345          .offset_words = 40,
 346          .offset_bits  = 0,
 347          .size_bits    = 2*64 },
 348};
 349
 350static void free_sm_ah(struct kref *kref)
 351{
 352        struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
 353
 354        ib_destroy_ah(sm_ah->ah);
 355        kfree(sm_ah);
 356}
 357
 358static void update_sm_ah(struct work_struct *work)
 359{
 360        struct ib_sa_port *port =
 361                container_of(work, struct ib_sa_port, update_task);
 362        struct ib_sa_sm_ah *new_ah;
 363        struct ib_port_attr port_attr;
 364        struct ib_ah_attr   ah_attr;
 365
 366        if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
 367                printk(KERN_WARNING "Couldn't query port\n");
 368                return;
 369        }
 370
 371        new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
 372        if (!new_ah) {
 373                printk(KERN_WARNING "Couldn't allocate new SM AH\n");
 374                return;
 375        }
 376
 377        kref_init(&new_ah->ref);
 378        new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
 379
 380        new_ah->pkey_index = 0;
 381        if (ib_find_pkey(port->agent->device, port->port_num,
 382                         IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
 383                printk(KERN_ERR "Couldn't find index for default PKey\n");
 384
 385        memset(&ah_attr, 0, sizeof ah_attr);
 386        ah_attr.dlid     = port_attr.sm_lid;
 387        ah_attr.sl       = port_attr.sm_sl;
 388        ah_attr.port_num = port->port_num;
 389
 390        new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
 391        if (IS_ERR(new_ah->ah)) {
 392                printk(KERN_WARNING "Couldn't create new SM AH\n");
 393                kfree(new_ah);
 394                return;
 395        }
 396
 397        spin_lock_irq(&port->ah_lock);
 398        port->sm_ah = new_ah;
 399        spin_unlock_irq(&port->ah_lock);
 400
 401}
 402
 403static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
 404{
 405        if (event->event == IB_EVENT_PORT_ERR    ||
 406            event->event == IB_EVENT_PORT_ACTIVE ||
 407            event->event == IB_EVENT_LID_CHANGE  ||
 408            event->event == IB_EVENT_PKEY_CHANGE ||
 409            event->event == IB_EVENT_SM_CHANGE   ||
 410            event->event == IB_EVENT_CLIENT_REREGISTER) {
 411                unsigned long flags;
 412                struct ib_sa_device *sa_dev =
 413                        container_of(handler, typeof(*sa_dev), event_handler);
 414                struct ib_sa_port *port =
 415                        &sa_dev->port[event->element.port_num - sa_dev->start_port];
 416
 417                spin_lock_irqsave(&port->ah_lock, flags);
 418                if (port->sm_ah)
 419                        kref_put(&port->sm_ah->ref, free_sm_ah);
 420                port->sm_ah = NULL;
 421                spin_unlock_irqrestore(&port->ah_lock, flags);
 422
 423                schedule_work(&sa_dev->port[event->element.port_num -
 424                                            sa_dev->start_port].update_task);
 425        }
 426}
 427
 428void ib_sa_register_client(struct ib_sa_client *client)
 429{
 430        atomic_set(&client->users, 1);
 431        init_completion(&client->comp);
 432}
 433EXPORT_SYMBOL(ib_sa_register_client);
 434
 435void ib_sa_unregister_client(struct ib_sa_client *client)
 436{
 437        ib_sa_client_put(client);
 438        wait_for_completion(&client->comp);
 439}
 440EXPORT_SYMBOL(ib_sa_unregister_client);
 441
 442/**
 443 * ib_sa_cancel_query - try to cancel an SA query
 444 * @id:ID of query to cancel
 445 * @query:query pointer to cancel
 446 *
 447 * Try to cancel an SA query.  If the id and query don't match up or
 448 * the query has already completed, nothing is done.  Otherwise the
 449 * query is canceled and will complete with a status of -EINTR.
 450 */
 451void ib_sa_cancel_query(int id, struct ib_sa_query *query)
 452{
 453        unsigned long flags;
 454        struct ib_mad_agent *agent;
 455        struct ib_mad_send_buf *mad_buf;
 456
 457        spin_lock_irqsave(&idr_lock, flags);
 458        if (idr_find(&query_idr, id) != query) {
 459                spin_unlock_irqrestore(&idr_lock, flags);
 460                return;
 461        }
 462        agent = query->port->agent;
 463        mad_buf = query->mad_buf;
 464        spin_unlock_irqrestore(&idr_lock, flags);
 465
 466        ib_cancel_mad(agent, mad_buf);
 467}
 468EXPORT_SYMBOL(ib_sa_cancel_query);
 469
 470static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
 471{
 472        struct ib_sa_device *sa_dev;
 473        struct ib_sa_port   *port;
 474        unsigned long flags;
 475        u8 src_path_mask;
 476
 477        sa_dev = ib_get_client_data(device, &sa_client);
 478        if (!sa_dev)
 479                return 0x7f;
 480
 481        port  = &sa_dev->port[port_num - sa_dev->start_port];
 482        spin_lock_irqsave(&port->ah_lock, flags);
 483        src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
 484        spin_unlock_irqrestore(&port->ah_lock, flags);
 485
 486        return src_path_mask;
 487}
 488
 489int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
 490                         struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
 491{
 492        int ret;
 493        u16 gid_index;
 494
 495        memset(ah_attr, 0, sizeof *ah_attr);
 496        ah_attr->dlid = be16_to_cpu(rec->dlid);
 497        ah_attr->sl = rec->sl;
 498        ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
 499                                 get_src_path_mask(device, port_num);
 500        ah_attr->port_num = port_num;
 501        ah_attr->static_rate = rec->rate;
 502
 503        if (rec->hop_limit > 1) {
 504                ah_attr->ah_flags = IB_AH_GRH;
 505                ah_attr->grh.dgid = rec->dgid;
 506
 507                ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
 508                                         &gid_index);
 509                if (ret)
 510                        return ret;
 511
 512                ah_attr->grh.sgid_index    = gid_index;
 513                ah_attr->grh.flow_label    = be32_to_cpu(rec->flow_label);
 514                ah_attr->grh.hop_limit     = rec->hop_limit;
 515                ah_attr->grh.traffic_class = rec->traffic_class;
 516        }
 517        return 0;
 518}
 519EXPORT_SYMBOL(ib_init_ah_from_path);
 520
 521static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
 522{
 523        unsigned long flags;
 524
 525        spin_lock_irqsave(&query->port->ah_lock, flags);
 526        if (!query->port->sm_ah) {
 527                spin_unlock_irqrestore(&query->port->ah_lock, flags);
 528                return -EAGAIN;
 529        }
 530        kref_get(&query->port->sm_ah->ref);
 531        query->sm_ah = query->port->sm_ah;
 532        spin_unlock_irqrestore(&query->port->ah_lock, flags);
 533
 534        query->mad_buf = ib_create_send_mad(query->port->agent, 1,
 535                                            query->sm_ah->pkey_index,
 536                                            0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
 537                                            gfp_mask);
 538        if (IS_ERR(query->mad_buf)) {
 539                kref_put(&query->sm_ah->ref, free_sm_ah);
 540                return -ENOMEM;
 541        }
 542
 543        query->mad_buf->ah = query->sm_ah->ah;
 544
 545        return 0;
 546}
 547
 548static void free_mad(struct ib_sa_query *query)
 549{
 550        ib_free_send_mad(query->mad_buf);
 551        kref_put(&query->sm_ah->ref, free_sm_ah);
 552}
 553
 554static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
 555{
 556        unsigned long flags;
 557
 558        memset(mad, 0, sizeof *mad);
 559
 560        mad->mad_hdr.base_version  = IB_MGMT_BASE_VERSION;
 561        mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_SUBN_ADM;
 562        mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
 563
 564        spin_lock_irqsave(&tid_lock, flags);
 565        mad->mad_hdr.tid           =
 566                cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
 567        spin_unlock_irqrestore(&tid_lock, flags);
 568}
 569
 570static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
 571{
 572        unsigned long flags;
 573        int ret, id;
 574
 575retry:
 576        if (!idr_pre_get(&query_idr, gfp_mask))
 577                return -ENOMEM;
 578        spin_lock_irqsave(&idr_lock, flags);
 579        ret = idr_get_new(&query_idr, query, &id);
 580        spin_unlock_irqrestore(&idr_lock, flags);
 581        if (ret == -EAGAIN)
 582                goto retry;
 583        if (ret)
 584                return ret;
 585
 586        query->mad_buf->timeout_ms  = timeout_ms;
 587        query->mad_buf->context[0] = query;
 588        query->id = id;
 589
 590        ret = ib_post_send_mad(query->mad_buf, NULL);
 591        if (ret) {
 592                spin_lock_irqsave(&idr_lock, flags);
 593                idr_remove(&query_idr, id);
 594                spin_unlock_irqrestore(&idr_lock, flags);
 595        }
 596
 597        /*
 598         * It's not safe to dereference query any more, because the
 599         * send may already have completed and freed the query in
 600         * another context.
 601         */
 602        return ret ? ret : id;
 603}
 604
 605static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
 606                                    int status,
 607                                    struct ib_sa_mad *mad)
 608{
 609        struct ib_sa_path_query *query =
 610                container_of(sa_query, struct ib_sa_path_query, sa_query);
 611
 612        if (mad) {
 613                struct ib_sa_path_rec rec;
 614
 615                ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
 616                          mad->data, &rec);
 617                query->callback(status, &rec, query->context);
 618        } else
 619                query->callback(status, NULL, query->context);
 620}
 621
 622static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
 623{
 624        kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
 625}
 626
 627/**
 628 * ib_sa_path_rec_get - Start a Path get query
 629 * @client:SA client
 630 * @device:device to send query on
 631 * @port_num: port number to send query on
 632 * @rec:Path Record to send in query
 633 * @comp_mask:component mask to send in query
 634 * @timeout_ms:time to wait for response
 635 * @gfp_mask:GFP mask to use for internal allocations
 636 * @callback:function called when query completes, times out or is
 637 * canceled
 638 * @context:opaque user context passed to callback
 639 * @sa_query:query context, used to cancel query
 640 *
 641 * Send a Path Record Get query to the SA to look up a path.  The
 642 * callback function will be called when the query completes (or
 643 * fails); status is 0 for a successful response, -EINTR if the query
 644 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
 645 * occurred sending the query.  The resp parameter of the callback is
 646 * only valid if status is 0.
 647 *
 648 * If the return value of ib_sa_path_rec_get() is negative, it is an
 649 * error code.  Otherwise it is a query ID that can be used to cancel
 650 * the query.
 651 */
 652int ib_sa_path_rec_get(struct ib_sa_client *client,
 653                       struct ib_device *device, u8 port_num,
 654                       struct ib_sa_path_rec *rec,
 655                       ib_sa_comp_mask comp_mask,
 656                       int timeout_ms, gfp_t gfp_mask,
 657                       void (*callback)(int status,
 658                                        struct ib_sa_path_rec *resp,
 659                                        void *context),
 660                       void *context,
 661                       struct ib_sa_query **sa_query)
 662{
 663        struct ib_sa_path_query *query;
 664        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
 665        struct ib_sa_port   *port;
 666        struct ib_mad_agent *agent;
 667        struct ib_sa_mad *mad;
 668        int ret;
 669
 670        if (!sa_dev)
 671                return -ENODEV;
 672
 673        port  = &sa_dev->port[port_num - sa_dev->start_port];
 674        agent = port->agent;
 675
 676        query = kmalloc(sizeof *query, gfp_mask);
 677        if (!query)
 678                return -ENOMEM;
 679
 680        query->sa_query.port     = port;
 681        ret = alloc_mad(&query->sa_query, gfp_mask);
 682        if (ret)
 683                goto err1;
 684
 685        ib_sa_client_get(client);
 686        query->sa_query.client = client;
 687        query->callback        = callback;
 688        query->context         = context;
 689
 690        mad = query->sa_query.mad_buf->mad;
 691        init_mad(mad, agent);
 692
 693        query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
 694        query->sa_query.release  = ib_sa_path_rec_release;
 695        mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
 696        mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_PATH_REC);
 697        mad->sa_hdr.comp_mask    = comp_mask;
 698
 699        ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
 700
 701        *sa_query = &query->sa_query;
 702
 703        ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
 704        if (ret < 0)
 705                goto err2;
 706
 707        return ret;
 708
 709err2:
 710        *sa_query = NULL;
 711        ib_sa_client_put(query->sa_query.client);
 712        free_mad(&query->sa_query);
 713
 714err1:
 715        kfree(query);
 716        return ret;
 717}
 718EXPORT_SYMBOL(ib_sa_path_rec_get);
 719
 720static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
 721                                    int status,
 722                                    struct ib_sa_mad *mad)
 723{
 724        struct ib_sa_service_query *query =
 725                container_of(sa_query, struct ib_sa_service_query, sa_query);
 726
 727        if (mad) {
 728                struct ib_sa_service_rec rec;
 729
 730                ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
 731                          mad->data, &rec);
 732                query->callback(status, &rec, query->context);
 733        } else
 734                query->callback(status, NULL, query->context);
 735}
 736
 737static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
 738{
 739        kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
 740}
 741
 742/**
 743 * ib_sa_service_rec_query - Start Service Record operation
 744 * @client:SA client
 745 * @device:device to send request on
 746 * @port_num: port number to send request on
 747 * @method:SA method - should be get, set, or delete
 748 * @rec:Service Record to send in request
 749 * @comp_mask:component mask to send in request
 750 * @timeout_ms:time to wait for response
 751 * @gfp_mask:GFP mask to use for internal allocations
 752 * @callback:function called when request completes, times out or is
 753 * canceled
 754 * @context:opaque user context passed to callback
 755 * @sa_query:request context, used to cancel request
 756 *
 757 * Send a Service Record set/get/delete to the SA to register,
 758 * unregister or query a service record.
 759 * The callback function will be called when the request completes (or
 760 * fails); status is 0 for a successful response, -EINTR if the query
 761 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
 762 * occurred sending the query.  The resp parameter of the callback is
 763 * only valid if status is 0.
 764 *
 765 * If the return value of ib_sa_service_rec_query() is negative, it is an
 766 * error code.  Otherwise it is a request ID that can be used to cancel
 767 * the query.
 768 */
 769int ib_sa_service_rec_query(struct ib_sa_client *client,
 770                            struct ib_device *device, u8 port_num, u8 method,
 771                            struct ib_sa_service_rec *rec,
 772                            ib_sa_comp_mask comp_mask,
 773                            int timeout_ms, gfp_t gfp_mask,
 774                            void (*callback)(int status,
 775                                             struct ib_sa_service_rec *resp,
 776                                             void *context),
 777                            void *context,
 778                            struct ib_sa_query **sa_query)
 779{
 780        struct ib_sa_service_query *query;
 781        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
 782        struct ib_sa_port   *port;
 783        struct ib_mad_agent *agent;
 784        struct ib_sa_mad *mad;
 785        int ret;
 786
 787        if (!sa_dev)
 788                return -ENODEV;
 789
 790        port  = &sa_dev->port[port_num - sa_dev->start_port];
 791        agent = port->agent;
 792
 793        if (method != IB_MGMT_METHOD_GET &&
 794            method != IB_MGMT_METHOD_SET &&
 795            method != IB_SA_METHOD_DELETE)
 796                return -EINVAL;
 797
 798        query = kmalloc(sizeof *query, gfp_mask);
 799        if (!query)
 800                return -ENOMEM;
 801
 802        query->sa_query.port     = port;
 803        ret = alloc_mad(&query->sa_query, gfp_mask);
 804        if (ret)
 805                goto err1;
 806
 807        ib_sa_client_get(client);
 808        query->sa_query.client = client;
 809        query->callback        = callback;
 810        query->context         = context;
 811
 812        mad = query->sa_query.mad_buf->mad;
 813        init_mad(mad, agent);
 814
 815        query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
 816        query->sa_query.release  = ib_sa_service_rec_release;
 817        mad->mad_hdr.method      = method;
 818        mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
 819        mad->sa_hdr.comp_mask    = comp_mask;
 820
 821        ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
 822                rec, mad->data);
 823
 824        *sa_query = &query->sa_query;
 825
 826        ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
 827        if (ret < 0)
 828                goto err2;
 829
 830        return ret;
 831
 832err2:
 833        *sa_query = NULL;
 834        ib_sa_client_put(query->sa_query.client);
 835        free_mad(&query->sa_query);
 836
 837err1:
 838        kfree(query);
 839        return ret;
 840}
 841EXPORT_SYMBOL(ib_sa_service_rec_query);
 842
 843static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
 844                                        int status,
 845                                        struct ib_sa_mad *mad)
 846{
 847        struct ib_sa_mcmember_query *query =
 848                container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
 849
 850        if (mad) {
 851                struct ib_sa_mcmember_rec rec;
 852
 853                ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
 854                          mad->data, &rec);
 855                query->callback(status, &rec, query->context);
 856        } else
 857                query->callback(status, NULL, query->context);
 858}
 859
 860static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
 861{
 862        kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
 863}
 864
 865int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
 866                             struct ib_device *device, u8 port_num,
 867                             u8 method,
 868                             struct ib_sa_mcmember_rec *rec,
 869                             ib_sa_comp_mask comp_mask,
 870                             int timeout_ms, gfp_t gfp_mask,
 871                             void (*callback)(int status,
 872                                              struct ib_sa_mcmember_rec *resp,
 873                                              void *context),
 874                             void *context,
 875                             struct ib_sa_query **sa_query)
 876{
 877        struct ib_sa_mcmember_query *query;
 878        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
 879        struct ib_sa_port   *port;
 880        struct ib_mad_agent *agent;
 881        struct ib_sa_mad *mad;
 882        int ret;
 883
 884        if (!sa_dev)
 885                return -ENODEV;
 886
 887        port  = &sa_dev->port[port_num - sa_dev->start_port];
 888        agent = port->agent;
 889
 890        query = kmalloc(sizeof *query, gfp_mask);
 891        if (!query)
 892                return -ENOMEM;
 893
 894        query->sa_query.port     = port;
 895        ret = alloc_mad(&query->sa_query, gfp_mask);
 896        if (ret)
 897                goto err1;
 898
 899        ib_sa_client_get(client);
 900        query->sa_query.client = client;
 901        query->callback        = callback;
 902        query->context         = context;
 903
 904        mad = query->sa_query.mad_buf->mad;
 905        init_mad(mad, agent);
 906
 907        query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
 908        query->sa_query.release  = ib_sa_mcmember_rec_release;
 909        mad->mad_hdr.method      = method;
 910        mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
 911        mad->sa_hdr.comp_mask    = comp_mask;
 912
 913        ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
 914                rec, mad->data);
 915
 916        *sa_query = &query->sa_query;
 917
 918        ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
 919        if (ret < 0)
 920                goto err2;
 921
 922        return ret;
 923
 924err2:
 925        *sa_query = NULL;
 926        ib_sa_client_put(query->sa_query.client);
 927        free_mad(&query->sa_query);
 928
 929err1:
 930        kfree(query);
 931        return ret;
 932}
 933
 934static void send_handler(struct ib_mad_agent *agent,
 935                         struct ib_mad_send_wc *mad_send_wc)
 936{
 937        struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
 938        unsigned long flags;
 939
 940        if (query->callback)
 941                switch (mad_send_wc->status) {
 942                case IB_WC_SUCCESS:
 943                        /* No callback -- already got recv */
 944                        break;
 945                case IB_WC_RESP_TIMEOUT_ERR:
 946                        query->callback(query, -ETIMEDOUT, NULL);
 947                        break;
 948                case IB_WC_WR_FLUSH_ERR:
 949                        query->callback(query, -EINTR, NULL);
 950                        break;
 951                default:
 952                        query->callback(query, -EIO, NULL);
 953                        break;
 954                }
 955
 956        spin_lock_irqsave(&idr_lock, flags);
 957        idr_remove(&query_idr, query->id);
 958        spin_unlock_irqrestore(&idr_lock, flags);
 959
 960        free_mad(query);
 961        ib_sa_client_put(query->client);
 962        query->release(query);
 963}
 964
 965static void recv_handler(struct ib_mad_agent *mad_agent,
 966                         struct ib_mad_recv_wc *mad_recv_wc)
 967{
 968        struct ib_sa_query *query;
 969        struct ib_mad_send_buf *mad_buf;
 970
 971        mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
 972        query = mad_buf->context[0];
 973
 974        if (query->callback) {
 975                if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
 976                        query->callback(query,
 977                                        mad_recv_wc->recv_buf.mad->mad_hdr.status ?
 978                                        -EINVAL : 0,
 979                                        (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
 980                else
 981                        query->callback(query, -EIO, NULL);
 982        }
 983
 984        ib_free_recv_mad(mad_recv_wc);
 985}
 986
 987static void ib_sa_add_one(struct ib_device *device)
 988{
 989        struct ib_sa_device *sa_dev;
 990        int s, e, i;
 991
 992        if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
 993                return;
 994
 995        if (device->node_type == RDMA_NODE_IB_SWITCH)
 996                s = e = 0;
 997        else {
 998                s = 1;
 999                e = device->phys_port_cnt;
1000        }
1001
1002        sa_dev = kmalloc(sizeof *sa_dev +
1003                         (e - s + 1) * sizeof (struct ib_sa_port),
1004                         GFP_KERNEL);
1005        if (!sa_dev)
1006                return;
1007
1008        sa_dev->start_port = s;
1009        sa_dev->end_port   = e;
1010
1011        for (i = 0; i <= e - s; ++i) {
1012                sa_dev->port[i].sm_ah    = NULL;
1013                sa_dev->port[i].port_num = i + s;
1014                spin_lock_init(&sa_dev->port[i].ah_lock);
1015
1016                sa_dev->port[i].agent =
1017                        ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1018                                              NULL, 0, send_handler,
1019                                              recv_handler, sa_dev);
1020                if (IS_ERR(sa_dev->port[i].agent))
1021                        goto err;
1022
1023                INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1024        }
1025
1026        ib_set_client_data(device, &sa_client, sa_dev);
1027
1028        /*
1029         * We register our event handler after everything is set up,
1030         * and then update our cached info after the event handler is
1031         * registered to avoid any problems if a port changes state
1032         * during our initialization.
1033         */
1034
1035        INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1036        if (ib_register_event_handler(&sa_dev->event_handler))
1037                goto err;
1038
1039        for (i = 0; i <= e - s; ++i)
1040                update_sm_ah(&sa_dev->port[i].update_task);
1041
1042        return;
1043
1044err:
1045        while (--i >= 0)
1046                ib_unregister_mad_agent(sa_dev->port[i].agent);
1047
1048        kfree(sa_dev);
1049
1050        return;
1051}
1052
1053static void ib_sa_remove_one(struct ib_device *device)
1054{
1055        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1056        int i;
1057
1058        if (!sa_dev)
1059                return;
1060
1061        ib_unregister_event_handler(&sa_dev->event_handler);
1062
1063        flush_scheduled_work();
1064
1065        for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1066                ib_unregister_mad_agent(sa_dev->port[i].agent);
1067                if (sa_dev->port[i].sm_ah)
1068                        kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1069        }
1070
1071        kfree(sa_dev);
1072}
1073
1074static int __init ib_sa_init(void)
1075{
1076        int ret;
1077
1078        spin_lock_init(&idr_lock);
1079        spin_lock_init(&tid_lock);
1080
1081        get_random_bytes(&tid, sizeof tid);
1082
1083        ret = ib_register_client(&sa_client);
1084        if (ret) {
1085                printk(KERN_ERR "Couldn't register ib_sa client\n");
1086                goto err1;
1087        }
1088
1089        ret = mcast_init();
1090        if (ret) {
1091                printk(KERN_ERR "Couldn't initialize multicast handling\n");
1092                goto err2;
1093        }
1094
1095        return 0;
1096err2:
1097        ib_unregister_client(&sa_client);
1098err1:
1099        return ret;
1100}
1101
1102static void __exit ib_sa_cleanup(void)
1103{
1104        mcast_cleanup();
1105        ib_unregister_client(&sa_client);
1106        idr_destroy(&query_idr);
1107}
1108
1109module_init(ib_sa_init);
1110module_exit(ib_sa_cleanup);
1111
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