LXR linux/include/rdma/ib

   1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
   2/*
   3 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   4 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   5 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
   6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   7 * Copyright (c) 2019, Mellanox Technologies inc.  All rights reserved.
   8 */
   9#ifndef IB_CM_H
  10#define IB_CM_H
  11
  12#include <rdma/ib_mad.h>
  13#include <rdma/ib_sa.h>
  14
  15/* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
  16extern struct class cm_class;
  17
  18enum ib_cm_state {
  19        IB_CM_IDLE,
  20        IB_CM_LISTEN,
  21        IB_CM_REQ_SENT,
  22        IB_CM_REQ_RCVD,
  23        IB_CM_MRA_REQ_SENT,
  24        IB_CM_MRA_REQ_RCVD,
  25        IB_CM_REP_SENT,
  26        IB_CM_REP_RCVD,
  27        IB_CM_MRA_REP_SENT,
  28        IB_CM_MRA_REP_RCVD,
  29        IB_CM_ESTABLISHED,
  30        IB_CM_DREQ_SENT,
  31        IB_CM_DREQ_RCVD,
  32        IB_CM_TIMEWAIT,
  33        IB_CM_SIDR_REQ_SENT,
  34        IB_CM_SIDR_REQ_RCVD
  35};
  36
  37enum ib_cm_lap_state {
  38        IB_CM_LAP_UNINIT,
  39        IB_CM_LAP_IDLE,
  40        IB_CM_LAP_SENT,
  41        IB_CM_LAP_RCVD,
  42        IB_CM_MRA_LAP_SENT,
  43        IB_CM_MRA_LAP_RCVD,
  44};
  45
  46enum ib_cm_event_type {
  47        IB_CM_REQ_ERROR,
  48        IB_CM_REQ_RECEIVED,
  49        IB_CM_REP_ERROR,
  50        IB_CM_REP_RECEIVED,
  51        IB_CM_RTU_RECEIVED,
  52        IB_CM_USER_ESTABLISHED,
  53        IB_CM_DREQ_ERROR,
  54        IB_CM_DREQ_RECEIVED,
  55        IB_CM_DREP_RECEIVED,
  56        IB_CM_TIMEWAIT_EXIT,
  57        IB_CM_MRA_RECEIVED,
  58        IB_CM_REJ_RECEIVED,
  59        IB_CM_LAP_ERROR,
  60        IB_CM_LAP_RECEIVED,
  61        IB_CM_APR_RECEIVED,
  62        IB_CM_SIDR_REQ_ERROR,
  63        IB_CM_SIDR_REQ_RECEIVED,
  64        IB_CM_SIDR_REP_RECEIVED
  65};
  66
  67enum ib_cm_data_size {
  68        IB_CM_REQ_PRIVATE_DATA_SIZE      = 92,
  69        IB_CM_MRA_PRIVATE_DATA_SIZE      = 222,
  70        IB_CM_REJ_PRIVATE_DATA_SIZE      = 148,
  71        IB_CM_REP_PRIVATE_DATA_SIZE      = 196,
  72        IB_CM_RTU_PRIVATE_DATA_SIZE      = 224,
  73        IB_CM_DREQ_PRIVATE_DATA_SIZE     = 220,
  74        IB_CM_DREP_PRIVATE_DATA_SIZE     = 224,
  75        IB_CM_REJ_ARI_LENGTH             = 72,
  76        IB_CM_LAP_PRIVATE_DATA_SIZE      = 168,
  77        IB_CM_APR_PRIVATE_DATA_SIZE      = 148,
  78        IB_CM_APR_INFO_LENGTH            = 72,
  79        IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216,
  80        IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136,
  81        IB_CM_SIDR_REP_INFO_LENGTH       = 72,
  82};
  83
  84struct ib_cm_id;
  85
  86struct ib_cm_req_event_param {
  87        struct ib_cm_id         *listen_id;
  88
  89        /* P_Key that was used by the GMP's BTH header */
  90        u16                     bth_pkey;
  91
  92        u8                      port;
  93
  94        struct sa_path_rec      *primary_path;
  95        struct sa_path_rec      *alternate_path;
  96
  97        /*
  98         * SGID attribute of the primary path. Currently only
  99         * useful for RoCE. Alternate path GID attributes
 100         * are not yet supported.
 101         */
 102        const struct ib_gid_attr *ppath_sgid_attr;
 103
 104        __be64                  remote_ca_guid;
 105        u32                     remote_qkey;
 106        u32                     remote_qpn;
 107        enum ib_qp_type         qp_type;
 108
 109        u32                     starting_psn;
 110        u8                      responder_resources;
 111        u8                      initiator_depth;
 112        unsigned int            local_cm_response_timeout:5;
 113        unsigned int            flow_control:1;
 114        unsigned int            remote_cm_response_timeout:5;
 115        unsigned int            retry_count:3;
 116        unsigned int            rnr_retry_count:3;
 117        unsigned int            srq:1;
 118};
 119
 120struct ib_cm_rep_event_param {
 121        __be64                  remote_ca_guid;
 122        u32                     remote_qkey;
 123        u32                     remote_qpn;
 124        u32                     starting_psn;
 125        u8                      responder_resources;
 126        u8                      initiator_depth;
 127        unsigned int            target_ack_delay:5;
 128        unsigned int            failover_accepted:2;
 129        unsigned int            flow_control:1;
 130        unsigned int            rnr_retry_count:3;
 131        unsigned int            srq:1;
 132};
 133
 134enum ib_cm_rej_reason {
 135        IB_CM_REJ_NO_QP                         = 1,
 136        IB_CM_REJ_NO_EEC                        = 2,
 137        IB_CM_REJ_NO_RESOURCES                  = 3,
 138        IB_CM_REJ_TIMEOUT                       = 4,
 139        IB_CM_REJ_UNSUPPORTED                   = 5,
 140        IB_CM_REJ_INVALID_COMM_ID               = 6,
 141        IB_CM_REJ_INVALID_COMM_INSTANCE         = 7,
 142        IB_CM_REJ_INVALID_SERVICE_ID            = 8,
 143        IB_CM_REJ_INVALID_TRANSPORT_TYPE        = 9,
 144        IB_CM_REJ_STALE_CONN                    = 10,
 145        IB_CM_REJ_RDC_NOT_EXIST                 = 11,
 146        IB_CM_REJ_INVALID_GID                   = 12,
 147        IB_CM_REJ_INVALID_LID                   = 13,
 148        IB_CM_REJ_INVALID_SL                    = 14,
 149        IB_CM_REJ_INVALID_TRAFFIC_CLASS         = 15,
 150        IB_CM_REJ_INVALID_HOP_LIMIT             = 16,
 151        IB_CM_REJ_INVALID_PACKET_RATE           = 17,
 152        IB_CM_REJ_INVALID_ALT_GID               = 18,
 153        IB_CM_REJ_INVALID_ALT_LID               = 19,
 154        IB_CM_REJ_INVALID_ALT_SL                = 20,
 155        IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS     = 21,
 156        IB_CM_REJ_INVALID_ALT_HOP_LIMIT         = 22,
 157        IB_CM_REJ_INVALID_ALT_PACKET_RATE       = 23,
 158        IB_CM_REJ_PORT_CM_REDIRECT              = 24,
 159        IB_CM_REJ_PORT_REDIRECT                 = 25,
 160        IB_CM_REJ_INVALID_MTU                   = 26,
 161        IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES   = 27,
 162        IB_CM_REJ_CONSUMER_DEFINED              = 28,
 163        IB_CM_REJ_INVALID_RNR_RETRY             = 29,
 164        IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID       = 30,
 165        IB_CM_REJ_INVALID_CLASS_VERSION         = 31,
 166        IB_CM_REJ_INVALID_FLOW_LABEL            = 32,
 167        IB_CM_REJ_INVALID_ALT_FLOW_LABEL        = 33
 168};
 169
 170struct ib_cm_rej_event_param {
 171        enum ib_cm_rej_reason   reason;
 172        void                    *ari;
 173        u8                      ari_length;
 174};
 175
 176struct ib_cm_mra_event_param {
 177        u8      service_timeout;
 178};
 179
 180struct ib_cm_lap_event_param {
 181        struct sa_path_rec      *alternate_path;
 182};
 183
 184enum ib_cm_apr_status {
 185        IB_CM_APR_SUCCESS,
 186        IB_CM_APR_INVALID_COMM_ID,
 187        IB_CM_APR_UNSUPPORTED,
 188        IB_CM_APR_REJECT,
 189        IB_CM_APR_REDIRECT,
 190        IB_CM_APR_IS_CURRENT,
 191        IB_CM_APR_INVALID_QPN_EECN,
 192        IB_CM_APR_INVALID_LID,
 193        IB_CM_APR_INVALID_GID,
 194        IB_CM_APR_INVALID_FLOW_LABEL,
 195        IB_CM_APR_INVALID_TCLASS,
 196        IB_CM_APR_INVALID_HOP_LIMIT,
 197        IB_CM_APR_INVALID_PACKET_RATE,
 198        IB_CM_APR_INVALID_SL
 199};
 200
 201struct ib_cm_apr_event_param {
 202        enum ib_cm_apr_status   ap_status;
 203        void                    *apr_info;
 204        u8                      info_len;
 205};
 206
 207struct ib_cm_sidr_req_event_param {
 208        struct ib_cm_id         *listen_id;
 209        __be64                  service_id;
 210
 211        /*
 212         * SGID attribute of the request. Currently only
 213         * useful for RoCE.
 214         */
 215        const struct ib_gid_attr *sgid_attr;
 216        /* P_Key that was used by the GMP's BTH header */
 217        u16                     bth_pkey;
 218        u8                      port;
 219        u16                     pkey;
 220};
 221
 222enum ib_cm_sidr_status {
 223        IB_SIDR_SUCCESS,
 224        IB_SIDR_UNSUPPORTED,
 225        IB_SIDR_REJECT,
 226        IB_SIDR_NO_QP,
 227        IB_SIDR_REDIRECT,
 228        IB_SIDR_UNSUPPORTED_VERSION
 229};
 230
 231struct ib_cm_sidr_rep_event_param {
 232        enum ib_cm_sidr_status  status;
 233        u32                     qkey;
 234        u32                     qpn;
 235        void                    *info;
 236        const struct ib_gid_attr *sgid_attr;
 237        u8                      info_len;
 238};
 239
 240struct ib_cm_event {
 241        enum ib_cm_event_type   event;
 242        union {
 243                struct ib_cm_req_event_param    req_rcvd;
 244                struct ib_cm_rep_event_param    rep_rcvd;
 245                /* No data for RTU received events. */
 246                struct ib_cm_rej_event_param    rej_rcvd;
 247                struct ib_cm_mra_event_param    mra_rcvd;
 248                struct ib_cm_lap_event_param    lap_rcvd;
 249                struct ib_cm_apr_event_param    apr_rcvd;
 250                /* No data for DREQ/DREP received events. */
 251                struct ib_cm_sidr_req_event_param sidr_req_rcvd;
 252                struct ib_cm_sidr_rep_event_param sidr_rep_rcvd;
 253                enum ib_wc_status               send_status;
 254        } param;
 255
 256        void                    *private_data;
 257};
 258
 259#define CM_REQ_ATTR_ID          cpu_to_be16(0x0010)
 260#define CM_MRA_ATTR_ID          cpu_to_be16(0x0011)
 261#define CM_REJ_ATTR_ID          cpu_to_be16(0x0012)
 262#define CM_REP_ATTR_ID          cpu_to_be16(0x0013)
 263#define CM_RTU_ATTR_ID          cpu_to_be16(0x0014)
 264#define CM_DREQ_ATTR_ID         cpu_to_be16(0x0015)
 265#define CM_DREP_ATTR_ID         cpu_to_be16(0x0016)
 266#define CM_SIDR_REQ_ATTR_ID     cpu_to_be16(0x0017)
 267#define CM_SIDR_REP_ATTR_ID     cpu_to_be16(0x0018)
 268#define CM_LAP_ATTR_ID          cpu_to_be16(0x0019)
 269#define CM_APR_ATTR_ID          cpu_to_be16(0x001A)
 270
 271/**
 272 * ib_cm_handler - User-defined callback to process communication events.
 273 * @cm_id: Communication identifier associated with the reported event.
 274 * @event: Information about the communication event.
 275 *
 276 * IB_CM_REQ_RECEIVED and IB_CM_SIDR_REQ_RECEIVED communication events
 277 * generated as a result of listen requests result in the allocation of a
 278 * new @cm_id.  The new @cm_id is returned to the user through this callback.
 279 * Clients are responsible for destroying the new @cm_id.  For peer-to-peer
 280 * IB_CM_REQ_RECEIVED and all other events, the returned @cm_id corresponds
 281 * to a user's existing communication identifier.
 282 *
 283 * Users may not call ib_destroy_cm_id while in the context of this callback;
 284 * however, returning a non-zero value instructs the communication manager to
 285 * destroy the @cm_id after the callback completes.
 286 */
 287typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
 288                             const struct ib_cm_event *event);
 289
 290struct ib_cm_id {
 291        ib_cm_handler           cm_handler;
 292        void                    *context;
 293        struct ib_device        *device;
 294        __be64                  service_id;
 295        __be64                  service_mask;
 296        enum ib_cm_state        state;          /* internal CM/debug use */
 297        enum ib_cm_lap_state    lap_state;      /* internal CM/debug use */
 298        __be32                  local_id;
 299        __be32                  remote_id;
 300        u32                     remote_cm_qpn;  /* 1 unless redirected */
 301};
 302
 303/**
 304 * ib_create_cm_id - Allocate a communication identifier.
 305 * @device: Device associated with the cm_id.  All related communication will
 306 * be associated with the specified device.
 307 * @cm_handler: Callback invoked to notify the user of CM events.
 308 * @context: User specified context associated with the communication
 309 *   identifier.
 310 *
 311 * Communication identifiers are used to track connection states, service
 312 * ID resolution requests, and listen requests.
 313 */
 314struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 315                                 ib_cm_handler cm_handler,
 316                                 void *context);
 317
 318/**
 319 * ib_destroy_cm_id - Destroy a connection identifier.
 320 * @cm_id: Connection identifier to destroy.
 321 *
 322 * This call blocks until the connection identifier is destroyed.
 323 */
 324void ib_destroy_cm_id(struct ib_cm_id *cm_id);
 325
 326#define IB_SERVICE_ID_AGN_MASK  cpu_to_be64(0xFF00000000000000ULL)
 327#define IB_CM_ASSIGN_SERVICE_ID cpu_to_be64(0x0200000000000000ULL)
 328#define IB_CMA_SERVICE_ID       cpu_to_be64(0x0000000001000000ULL)
 329#define IB_CMA_SERVICE_ID_MASK  cpu_to_be64(0xFFFFFFFFFF000000ULL)
 330#define IB_SDP_SERVICE_ID       cpu_to_be64(0x0000000000010000ULL)
 331#define IB_SDP_SERVICE_ID_MASK  cpu_to_be64(0xFFFFFFFFFFFF0000ULL)
 332
 333/**
 334 * ib_cm_listen - Initiates listening on the specified service ID for
 335 *   connection and service ID resolution requests.
 336 * @cm_id: Connection identifier associated with the listen request.
 337 * @service_id: Service identifier matched against incoming connection
 338 *   and service ID resolution requests.  The service ID should be specified
 339 *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
 340 *   assign a service ID to the caller.
 341 * @service_mask: Mask applied to service ID used to listen across a
 342 *   range of service IDs.  If set to 0, the service ID is matched
 343 *   exactly.  This parameter is ignored if %service_id is set to
 344 *   IB_CM_ASSIGN_SERVICE_ID.
 345 */
 346int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
 347                 __be64 service_mask);
 348
 349struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
 350                                     ib_cm_handler cm_handler,
 351                                     __be64 service_id);
 352
 353struct ib_cm_req_param {
 354        struct sa_path_rec      *primary_path;
 355        struct sa_path_rec      *alternate_path;
 356        const struct ib_gid_attr *ppath_sgid_attr;
 357        __be64                  service_id;
 358        u32                     qp_num;
 359        enum ib_qp_type         qp_type;
 360        u32                     starting_psn;
 361        const void              *private_data;
 362        u8                      private_data_len;
 363        u8                      peer_to_peer;
 364        u8                      responder_resources;
 365        u8                      initiator_depth;
 366        u8                      remote_cm_response_timeout;
 367        u8                      flow_control;
 368        u8                      local_cm_response_timeout;
 369        u8                      retry_count;
 370        u8                      rnr_retry_count;
 371        u8                      max_cm_retries;
 372        u8                      srq;
 373};
 374
 375/**
 376 * ib_send_cm_req - Sends a connection request to the remote node.
 377 * @cm_id: Connection identifier that will be associated with the
 378 *   connection request.
 379 * @param: Connection request information needed to establish the
 380 *   connection.
 381 */
 382int ib_send_cm_req(struct ib_cm_id *cm_id,
 383                   struct ib_cm_req_param *param);
 384
 385struct ib_cm_rep_param {
 386        u32             qp_num;
 387        u32             starting_psn;
 388        const void      *private_data;
 389        u8              private_data_len;
 390        u8              responder_resources;
 391        u8              initiator_depth;
 392        u8              failover_accepted;
 393        u8              flow_control;
 394        u8              rnr_retry_count;
 395        u8              srq;
 396};
 397
 398/**
 399 * ib_send_cm_rep - Sends a connection reply in response to a connection
 400 *   request.
 401 * @cm_id: Connection identifier that will be associated with the
 402 *   connection request.
 403 * @param: Connection reply information needed to establish the
 404 *   connection.
 405 */
 406int ib_send_cm_rep(struct ib_cm_id *cm_id,
 407                   struct ib_cm_rep_param *param);
 408
 409/**
 410 * ib_send_cm_rtu - Sends a connection ready to use message in response
 411 *   to a connection reply message.
 412 * @cm_id: Connection identifier associated with the connection request.
 413 * @private_data: Optional user-defined private data sent with the
 414 *   ready to use message.
 415 * @private_data_len: Size of the private data buffer, in bytes.
 416 */
 417int ib_send_cm_rtu(struct ib_cm_id *cm_id,
 418                   const void *private_data,
 419                   u8 private_data_len);
 420
 421/**
 422 * ib_send_cm_dreq - Sends a disconnection request for an existing
 423 *   connection.
 424 * @cm_id: Connection identifier associated with the connection being
 425 *   released.
 426 * @private_data: Optional user-defined private data sent with the
 427 *   disconnection request message.
 428 * @private_data_len: Size of the private data buffer, in bytes.
 429 */
 430int ib_send_cm_dreq(struct ib_cm_id *cm_id,
 431                    const void *private_data,
 432                    u8 private_data_len);
 433
 434/**
 435 * ib_send_cm_drep - Sends a disconnection reply to a disconnection request.
 436 * @cm_id: Connection identifier associated with the connection being
 437 *   released.
 438 * @private_data: Optional user-defined private data sent with the
 439 *   disconnection reply message.
 440 * @private_data_len: Size of the private data buffer, in bytes.
 441 *
 442 * If the cm_id is in the correct state, the CM will transition the connection
 443 * to the timewait state, even if an error occurs sending the DREP message.
 444 */
 445int ib_send_cm_drep(struct ib_cm_id *cm_id,
 446                    const void *private_data,
 447                    u8 private_data_len);
 448
 449/**
 450 * ib_cm_notify - Notifies the CM of an event reported to the consumer.
 451 * @cm_id: Connection identifier to transition to established.
 452 * @event: Type of event.
 453 *
 454 * This routine should be invoked by users to notify the CM of relevant
 455 * communication events.  Events that should be reported to the CM and
 456 * when to report them are:
 457 *
 458 * IB_EVENT_COMM_EST - Used when a message is received on a connected
 459 *    QP before an RTU has been received.
 460 * IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over
 461 *   to the alternate path.
 462 */
 463int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event);
 464
 465/**
 466 * ib_send_cm_rej - Sends a connection rejection message to the
 467 *   remote node.
 468 * @cm_id: Connection identifier associated with the connection being
 469 *   rejected.
 470 * @reason: Reason for the connection request rejection.
 471 * @ari: Optional additional rejection information.
 472 * @ari_length: Size of the additional rejection information, in bytes.
 473 * @private_data: Optional user-defined private data sent with the
 474 *   rejection message.
 475 * @private_data_len: Size of the private data buffer, in bytes.
 476 */
 477int ib_send_cm_rej(struct ib_cm_id *cm_id,
 478                   enum ib_cm_rej_reason reason,
 479                   void *ari,
 480                   u8 ari_length,
 481                   const void *private_data,
 482                   u8 private_data_len);
 483
 484#define IB_CM_MRA_FLAG_DELAY 0x80  /* Send MRA only after a duplicate msg */
 485
 486/**
 487 * ib_send_cm_mra - Sends a message receipt acknowledgement to a connection
 488 *   message.
 489 * @cm_id: Connection identifier associated with the connection message.
 490 * @service_timeout: The lower 5-bits specify the maximum time required for
 491 *   the sender to reply to the connection message.  The upper 3-bits
 492 *   specify additional control flags.
 493 * @private_data: Optional user-defined private data sent with the
 494 *   message receipt acknowledgement.
 495 * @private_data_len: Size of the private data buffer, in bytes.
 496 */
 497int ib_send_cm_mra(struct ib_cm_id *cm_id,
 498                   u8 service_timeout,
 499                   const void *private_data,
 500                   u8 private_data_len);
 501
 502/**
 503 * ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning
 504 *   to a specified QP state.
 505 * @cm_id: Communication identifier associated with the QP attributes to
 506 *   initialize.
 507 * @qp_attr: On input, specifies the desired QP state.  On output, the
 508 *   mandatory and desired optional attributes will be set in order to
 509 *   modify the QP to the specified state.
 510 * @qp_attr_mask: The QP attribute mask that may be used to transition the
 511 *   QP to the specified state.
 512 *
 513 * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 514 * will set all required attributes for the given transition, along with
 515 * known optional attributes.  Users may override the attributes returned from
 516 * this call before calling ib_modify_qp.
 517 */
 518int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
 519                       struct ib_qp_attr *qp_attr,
 520                       int *qp_attr_mask);
 521
 522struct ib_cm_sidr_req_param {
 523        struct sa_path_rec      *path;
 524        const struct ib_gid_attr *sgid_attr;
 525        __be64                  service_id;
 526        unsigned long           timeout_ms;
 527        const void              *private_data;
 528        u8                      private_data_len;
 529        u8                      max_cm_retries;
 530};
 531
 532/**
 533 * ib_send_cm_sidr_req - Sends a service ID resolution request to the
 534 *   remote node.
 535 * @cm_id: Communication identifier that will be associated with the
 536 *   service ID resolution request.
 537 * @param: Service ID resolution request information.
 538 */
 539int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
 540                        struct ib_cm_sidr_req_param *param);
 541
 542struct ib_cm_sidr_rep_param {
 543        u32                     qp_num;
 544        u32                     qkey;
 545        enum ib_cm_sidr_status  status;
 546        const void              *info;
 547        u8                      info_length;
 548        const void              *private_data;
 549        u8                      private_data_len;
 550};
 551
 552/**
 553 * ib_send_cm_sidr_rep - Sends a service ID resolution reply to the
 554 *   remote node.
 555 * @cm_id: Communication identifier associated with the received service ID
 556 *   resolution request.
 557 * @param: Service ID resolution reply information.
 558 */
 559int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
 560                        struct ib_cm_sidr_rep_param *param);
 561
 562/**
 563 * ibcm_reject_msg - return a pointer to a reject message string.
 564 * @reason: Value returned in the REJECT event status field.
 565 */
 566const char *__attribute_const__ ibcm_reject_msg(int reason);
 567
 568#endif /* IB_CM_H */
 569