include/rdma/ib_cm.h

   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 #include <rdma/rdma_cm.h>
  15
  16 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
  17 extern struct class cm_class;
  18
  19 enum ib_cm_state {
  20         IB_CM_IDLE,
  21         IB_CM_LISTEN,
  22         IB_CM_REQ_SENT,
  23         IB_CM_REQ_RCVD,
  24         IB_CM_MRA_REQ_SENT,
  25         IB_CM_MRA_REQ_RCVD,
  26         IB_CM_REP_SENT,
  27         IB_CM_REP_RCVD,
  28         IB_CM_MRA_REP_SENT,
  29         IB_CM_MRA_REP_RCVD,
  30         IB_CM_ESTABLISHED,
  31         IB_CM_DREQ_SENT,
  32         IB_CM_DREQ_RCVD,
  33         IB_CM_TIMEWAIT,
  34         IB_CM_SIDR_REQ_SENT,
  35         IB_CM_SIDR_REQ_RCVD
  36 };
  37
  38 enum ib_cm_lap_state {
  39         IB_CM_LAP_UNINIT,
  40         IB_CM_LAP_IDLE,
  41         IB_CM_LAP_SENT,
  42         IB_CM_LAP_RCVD,
  43         IB_CM_MRA_LAP_SENT,
  44         IB_CM_MRA_LAP_RCVD,
  45 };
  46
  47 enum ib_cm_event_type {
  48         IB_CM_REQ_ERROR,
  49         IB_CM_REQ_RECEIVED,
  50         IB_CM_REP_ERROR,
  51         IB_CM_REP_RECEIVED,
  52         IB_CM_RTU_RECEIVED,
  53         IB_CM_USER_ESTABLISHED,
  54         IB_CM_DREQ_ERROR,
  55         IB_CM_DREQ_RECEIVED,
  56         IB_CM_DREP_RECEIVED,
  57         IB_CM_TIMEWAIT_EXIT,
  58         IB_CM_MRA_RECEIVED,
  59         IB_CM_REJ_RECEIVED,
  60         IB_CM_LAP_ERROR,
  61         IB_CM_LAP_RECEIVED,
  62         IB_CM_APR_RECEIVED,
  63         IB_CM_SIDR_REQ_ERROR,
  64         IB_CM_SIDR_REQ_RECEIVED,
  65         IB_CM_SIDR_REP_RECEIVED
  66 };
  67
  68 enum ib_cm_data_size {
  69         IB_CM_REQ_PRIVATE_DATA_SIZE      = 92,
  70         IB_CM_MRA_PRIVATE_DATA_SIZE      = 222,
  71         IB_CM_REJ_PRIVATE_DATA_SIZE      = 148,
  72         IB_CM_REP_PRIVATE_DATA_SIZE      = 196,
  73         IB_CM_RTU_PRIVATE_DATA_SIZE      = 224,
  74         IB_CM_DREQ_PRIVATE_DATA_SIZE     = 220,
  75         IB_CM_DREP_PRIVATE_DATA_SIZE     = 224,
  76         IB_CM_REJ_ARI_LENGTH             = 72,
  77         IB_CM_LAP_PRIVATE_DATA_SIZE      = 168,
  78         IB_CM_APR_PRIVATE_DATA_SIZE      = 148,
  79         IB_CM_APR_INFO_LENGTH            = 72,
  80         IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216,
  81         IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136,
  82         IB_CM_SIDR_REP_INFO_LENGTH       = 72,
  83 };
  84
  85 struct ib_cm_id;
  86
  87 struct ib_cm_req_event_param {
  88         struct ib_cm_id         *listen_id;
  89
  90         /* P_Key that was used by the GMP's BTH header */
  91         u16                     bth_pkey;
  92
  93         u8                      port;
  94
  95         struct sa_path_rec      *primary_path;
  96         struct sa_path_rec      *alternate_path;
  97
  98         /*
  99          * SGID attribute of the primary path. Currently only
 100          * useful for RoCE. Alternate path GID attributes
 101          * are not yet supported.
 102          */
 103         const struct ib_gid_attr *ppath_sgid_attr;
 104
 105         __be64                  remote_ca_guid;
 106         u32                     remote_qkey;
 107         u32                     remote_qpn;
 108         enum ib_qp_type         qp_type;
 109
 110         u32                     starting_psn;
 111         u8                      responder_resources;
 112         u8                      initiator_depth;
 113         unsigned int            local_cm_response_timeout:5;
 114         unsigned int            flow_control:1;
 115         unsigned int            remote_cm_response_timeout:5;
 116         unsigned int            retry_count:3;
 117         unsigned int            rnr_retry_count:3;
 118         unsigned int            srq:1;
 119         struct rdma_ucm_ece     ece;
 120 };
 121
 122 struct ib_cm_rep_event_param {
 123         __be64                  remote_ca_guid;
 124         u32                     remote_qkey;
 125         u32                     remote_qpn;
 126         u32                     starting_psn;
 127         u8                      responder_resources;
 128         u8                      initiator_depth;
 129         unsigned int            target_ack_delay:5;
 130         unsigned int            failover_accepted:2;
 131         unsigned int            flow_control:1;
 132         unsigned int            rnr_retry_count:3;
 133         unsigned int            srq:1;
 134         struct rdma_ucm_ece     ece;
 135 };
 136
 137 enum ib_cm_rej_reason {
 138         IB_CM_REJ_NO_QP                         = 1,
 139         IB_CM_REJ_NO_EEC                        = 2,
 140         IB_CM_REJ_NO_RESOURCES                  = 3,
 141         IB_CM_REJ_TIMEOUT                       = 4,
 142         IB_CM_REJ_UNSUPPORTED                   = 5,
 143         IB_CM_REJ_INVALID_COMM_ID               = 6,
 144         IB_CM_REJ_INVALID_COMM_INSTANCE         = 7,
 145         IB_CM_REJ_INVALID_SERVICE_ID            = 8,
 146         IB_CM_REJ_INVALID_TRANSPORT_TYPE        = 9,
 147         IB_CM_REJ_STALE_CONN                    = 10,
 148         IB_CM_REJ_RDC_NOT_EXIST                 = 11,
 149         IB_CM_REJ_INVALID_GID                   = 12,
 150         IB_CM_REJ_INVALID_LID                   = 13,
 151         IB_CM_REJ_INVALID_SL                    = 14,
 152         IB_CM_REJ_INVALID_TRAFFIC_CLASS         = 15,
 153         IB_CM_REJ_INVALID_HOP_LIMIT             = 16,
 154         IB_CM_REJ_INVALID_PACKET_RATE           = 17,
 155         IB_CM_REJ_INVALID_ALT_GID               = 18,
 156         IB_CM_REJ_INVALID_ALT_LID               = 19,
 157         IB_CM_REJ_INVALID_ALT_SL                = 20,
 158         IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS     = 21,
 159         IB_CM_REJ_INVALID_ALT_HOP_LIMIT         = 22,
 160         IB_CM_REJ_INVALID_ALT_PACKET_RATE       = 23,
 161         IB_CM_REJ_PORT_CM_REDIRECT              = 24,
 162         IB_CM_REJ_PORT_REDIRECT                 = 25,
 163         IB_CM_REJ_INVALID_MTU                   = 26,
 164         IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES   = 27,
 165         IB_CM_REJ_CONSUMER_DEFINED              = 28,
 166         IB_CM_REJ_INVALID_RNR_RETRY             = 29,
 167         IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID       = 30,
 168         IB_CM_REJ_INVALID_CLASS_VERSION         = 31,
 169         IB_CM_REJ_INVALID_FLOW_LABEL            = 32,
 170         IB_CM_REJ_INVALID_ALT_FLOW_LABEL        = 33,
 171         IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED   = 35,
 172 };
 173
 174 struct ib_cm_rej_event_param {
 175         enum ib_cm_rej_reason   reason;
 176         void                    *ari;
 177         u8                      ari_length;
 178 };
 179
 180 struct ib_cm_mra_event_param {
 181         u8      service_timeout;
 182 };
 183
 184 struct ib_cm_lap_event_param {
 185         struct sa_path_rec      *alternate_path;
 186 };
 187
 188 enum ib_cm_apr_status {
 189         IB_CM_APR_SUCCESS,
 190         IB_CM_APR_INVALID_COMM_ID,
 191         IB_CM_APR_UNSUPPORTED,
 192         IB_CM_APR_REJECT,
 193         IB_CM_APR_REDIRECT,
 194         IB_CM_APR_IS_CURRENT,
 195         IB_CM_APR_INVALID_QPN_EECN,
 196         IB_CM_APR_INVALID_LID,
 197         IB_CM_APR_INVALID_GID,
 198         IB_CM_APR_INVALID_FLOW_LABEL,
 199         IB_CM_APR_INVALID_TCLASS,
 200         IB_CM_APR_INVALID_HOP_LIMIT,
 201         IB_CM_APR_INVALID_PACKET_RATE,
 202         IB_CM_APR_INVALID_SL
 203 };
 204
 205 struct ib_cm_apr_event_param {
 206         enum ib_cm_apr_status   ap_status;
 207         void                    *apr_info;
 208         u8                      info_len;
 209 };
 210
 211 struct ib_cm_sidr_req_event_param {
 212         struct ib_cm_id         *listen_id;
 213         __be64                  service_id;
 214
 215         /*
 216          * SGID attribute of the request. Currently only
 217          * useful for RoCE.
 218          */
 219         const struct ib_gid_attr *sgid_attr;
 220         /* P_Key that was used by the GMP's BTH header */
 221         u16                     bth_pkey;
 222         u8                      port;
 223         u16                     pkey;
 224 };
 225
 226 enum ib_cm_sidr_status {
 227         IB_SIDR_SUCCESS,
 228         IB_SIDR_UNSUPPORTED,
 229         IB_SIDR_REJECT,
 230         IB_SIDR_NO_QP,
 231         IB_SIDR_REDIRECT,
 232         IB_SIDR_UNSUPPORTED_VERSION
 233 };
 234
 235 struct ib_cm_sidr_rep_event_param {
 236         enum ib_cm_sidr_status  status;
 237         u32                     qkey;
 238         u32                     qpn;
 239         void                    *info;
 240         const struct ib_gid_attr *sgid_attr;
 241         u8                      info_len;
 242 };
 243
 244 struct ib_cm_event {
 245         enum ib_cm_event_type   event;
 246         union {
 247                 struct ib_cm_req_event_param    req_rcvd;
 248                 struct ib_cm_rep_event_param    rep_rcvd;
 249                 /* No data for RTU received events. */
 250                 struct ib_cm_rej_event_param    rej_rcvd;
 251                 struct ib_cm_mra_event_param    mra_rcvd;
 252                 struct ib_cm_lap_event_param    lap_rcvd;
 253                 struct ib_cm_apr_event_param    apr_rcvd;
 254                 /* No data for DREQ/DREP received events. */
 255                 struct ib_cm_sidr_req_event_param sidr_req_rcvd;
 256                 struct ib_cm_sidr_rep_event_param sidr_rep_rcvd;
 257                 enum ib_wc_status               send_status;
 258         } param;
 259
 260         void                    *private_data;
 261 };
 262
 263 #define CM_REQ_ATTR_ID          cpu_to_be16(0x0010)
 264 #define CM_MRA_ATTR_ID          cpu_to_be16(0x0011)
 265 #define CM_REJ_ATTR_ID          cpu_to_be16(0x0012)
 266 #define CM_REP_ATTR_ID          cpu_to_be16(0x0013)
 267 #define CM_RTU_ATTR_ID          cpu_to_be16(0x0014)
 268 #define CM_DREQ_ATTR_ID         cpu_to_be16(0x0015)
 269 #define CM_DREP_ATTR_ID         cpu_to_be16(0x0016)
 270 #define CM_SIDR_REQ_ATTR_ID     cpu_to_be16(0x0017)
 271 #define CM_SIDR_REP_ATTR_ID     cpu_to_be16(0x0018)
 272 #define CM_LAP_ATTR_ID          cpu_to_be16(0x0019)
 273 #define CM_APR_ATTR_ID          cpu_to_be16(0x001A)
 274
 275 /**
 276  * ib_cm_handler - User-defined callback to process communication events.
 277  * @cm_id: Communication identifier associated with the reported event.
 278  * @event: Information about the communication event.
 279  *
 280  * IB_CM_REQ_RECEIVED and IB_CM_SIDR_REQ_RECEIVED communication events
 281  * generated as a result of listen requests result in the allocation of a
 282  * new @cm_id.  The new @cm_id is returned to the user through this callback.
 283  * Clients are responsible for destroying the new @cm_id.  For peer-to-peer
 284  * IB_CM_REQ_RECEIVED and all other events, the returned @cm_id corresponds
 285  * to a user's existing communication identifier.
 286  *
 287  * Users may not call ib_destroy_cm_id while in the context of this callback;
 288  * however, returning a non-zero value instructs the communication manager to
 289  * destroy the @cm_id after the callback completes.
 290  */
 291 typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
 292                              const struct ib_cm_event *event);
 293
 294 struct ib_cm_id {
 295         ib_cm_handler           cm_handler;
 296         void                    *context;
 297         struct ib_device        *device;
 298         __be64                  service_id;
 299         __be64                  service_mask;
 300         enum ib_cm_state        state;          /* internal CM/debug use */
 301         enum ib_cm_lap_state    lap_state;      /* internal CM/debug use */
 302         __be32                  local_id;
 303         __be32                  remote_id;
 304         u32                     remote_cm_qpn;  /* 1 unless redirected */
 305 };
 306
 307 /**
 308  * ib_create_cm_id - Allocate a communication identifier.
 309  * @device: Device associated with the cm_id.  All related communication will
 310  * be associated with the specified device.
 311  * @cm_handler: Callback invoked to notify the user of CM events.
 312  * @context: User specified context associated with the communication
 313  *   identifier.
 314  *
 315  * Communication identifiers are used to track connection states, service
 316  * ID resolution requests, and listen requests.
 317  */
 318 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 319                                  ib_cm_handler cm_handler,
 320                                  void *context);
 321
 322 /**
 323  * ib_destroy_cm_id - Destroy a connection identifier.
 324  * @cm_id: Connection identifier to destroy.
 325  *
 326  * This call blocks until the connection identifier is destroyed.
 327  */
 328 void ib_destroy_cm_id(struct ib_cm_id *cm_id);
 329
 330 #define IB_SERVICE_ID_AGN_MASK  cpu_to_be64(0xFF00000000000000ULL)
 331 #define IB_CM_ASSIGN_SERVICE_ID cpu_to_be64(0x0200000000000000ULL)
 332 #define IB_CMA_SERVICE_ID       cpu_to_be64(0x0000000001000000ULL)
 333 #define IB_CMA_SERVICE_ID_MASK  cpu_to_be64(0xFFFFFFFFFF000000ULL)
 334 #define IB_SDP_SERVICE_ID       cpu_to_be64(0x0000000000010000ULL)
 335 #define IB_SDP_SERVICE_ID_MASK  cpu_to_be64(0xFFFFFFFFFFFF0000ULL)
 336
 337 /**
 338  * ib_cm_listen - Initiates listening on the specified service ID for
 339  *   connection and service ID resolution requests.
 340  * @cm_id: Connection identifier associated with the listen request.
 341  * @service_id: Service identifier matched against incoming connection
 342  *   and service ID resolution requests.  The service ID should be specified
 343  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
 344  *   assign a service ID to the caller.
 345  * @service_mask: Mask applied to service ID used to listen across a
 346  *   range of service IDs.  If set to 0, the service ID is matched
 347  *   exactly.  This parameter is ignored if %service_id is set to
 348  *   IB_CM_ASSIGN_SERVICE_ID.
 349  */
 350 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
 351                  __be64 service_mask);
 352
 353 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
 354                                      ib_cm_handler cm_handler,
 355                                      __be64 service_id);
 356
 357 struct ib_cm_req_param {
 358         struct sa_path_rec      *primary_path;
 359         struct sa_path_rec      *alternate_path;
 360         const struct ib_gid_attr *ppath_sgid_attr;
 361         __be64                  service_id;
 362         u32                     qp_num;
 363         enum ib_qp_type         qp_type;
 364         u32                     starting_psn;
 365         const void              *private_data;
 366         u8                      private_data_len;
 367         u8                      responder_resources;
 368         u8                      initiator_depth;
 369         u8                      remote_cm_response_timeout;
 370         u8                      flow_control;
 371         u8                      local_cm_response_timeout;
 372         u8                      retry_count;
 373         u8                      rnr_retry_count;
 374         u8                      max_cm_retries;
 375         u8                      srq;
 376         struct rdma_ucm_ece     ece;
 377 };
 378
 379 /**
 380  * ib_send_cm_req - Sends a connection request to the remote node.
 381  * @cm_id: Connection identifier that will be associated with the
 382  *   connection request.
 383  * @param: Connection request information needed to establish the
 384  *   connection.
 385  */
 386 int ib_send_cm_req(struct ib_cm_id *cm_id,
 387                    struct ib_cm_req_param *param);
 388
 389 struct ib_cm_rep_param {
 390         u32             qp_num;
 391         u32             starting_psn;
 392         const void      *private_data;
 393         u8              private_data_len;
 394         u8              responder_resources;
 395         u8              initiator_depth;
 396         u8              failover_accepted;
 397         u8              flow_control;
 398         u8              rnr_retry_count;
 399         u8              srq;
 400         struct rdma_ucm_ece ece;
 401 };
 402
 403 /**
 404  * ib_send_cm_rep - Sends a connection reply in response to a connection
 405  *   request.
 406  * @cm_id: Connection identifier that will be associated with the
 407  *   connection request.
 408  * @param: Connection reply information needed to establish the
 409  *   connection.
 410  */
 411 int ib_send_cm_rep(struct ib_cm_id *cm_id,
 412                    struct ib_cm_rep_param *param);
 413
 414 /**
 415  * ib_send_cm_rtu - Sends a connection ready to use message in response
 416  *   to a connection reply message.
 417  * @cm_id: Connection identifier associated with the connection request.
 418  * @private_data: Optional user-defined private data sent with the
 419  *   ready to use message.
 420  * @private_data_len: Size of the private data buffer, in bytes.
 421  */
 422 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
 423                    const void *private_data,
 424                    u8 private_data_len);
 425
 426 /**
 427  * ib_send_cm_dreq - Sends a disconnection request for an existing
 428  *   connection.
 429  * @cm_id: Connection identifier associated with the connection being
 430  *   released.
 431  * @private_data: Optional user-defined private data sent with the
 432  *   disconnection request message.
 433  * @private_data_len: Size of the private data buffer, in bytes.
 434  */
 435 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
 436                     const void *private_data,
 437                     u8 private_data_len);
 438
 439 /**
 440  * ib_send_cm_drep - Sends a disconnection reply to a disconnection request.
 441  * @cm_id: Connection identifier associated with the connection being
 442  *   released.
 443  * @private_data: Optional user-defined private data sent with the
 444  *   disconnection reply message.
 445  * @private_data_len: Size of the private data buffer, in bytes.
 446  *
 447  * If the cm_id is in the correct state, the CM will transition the connection
 448  * to the timewait state, even if an error occurs sending the DREP message.
 449  */
 450 int ib_send_cm_drep(struct ib_cm_id *cm_id,
 451                     const void *private_data,
 452                     u8 private_data_len);
 453
 454 /**
 455  * ib_cm_notify - Notifies the CM of an event reported to the consumer.
 456  * @cm_id: Connection identifier to transition to established.
 457  * @event: Type of event.
 458  *
 459  * This routine should be invoked by users to notify the CM of relevant
 460  * communication events.  Events that should be reported to the CM and
 461  * when to report them are:
 462  *
 463  * IB_EVENT_COMM_EST - Used when a message is received on a connected
 464  *    QP before an RTU has been received.
 465  * IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over
 466  *   to the alternate path.
 467  */
 468 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event);
 469
 470 /**
 471  * ib_send_cm_rej - Sends a connection rejection message to the
 472  *   remote node.
 473  * @cm_id: Connection identifier associated with the connection being
 474  *   rejected.
 475  * @reason: Reason for the connection request rejection.
 476  * @ari: Optional additional rejection information.
 477  * @ari_length: Size of the additional rejection information, in bytes.
 478  * @private_data: Optional user-defined private data sent with the
 479  *   rejection message.
 480  * @private_data_len: Size of the private data buffer, in bytes.
 481  */
 482 int ib_send_cm_rej(struct ib_cm_id *cm_id,
 483                    enum ib_cm_rej_reason reason,
 484                    void *ari,
 485                    u8 ari_length,
 486                    const void *private_data,
 487                    u8 private_data_len);
 488
 489 #define IB_CM_MRA_FLAG_DELAY 0x80  /* Send MRA only after a duplicate msg */
 490
 491 /**
 492  * ib_send_cm_mra - Sends a message receipt acknowledgement to a connection
 493  *   message.
 494  * @cm_id: Connection identifier associated with the connection message.
 495  * @service_timeout: The lower 5-bits specify the maximum time required for
 496  *   the sender to reply to the connection message.  The upper 3-bits
 497  *   specify additional control flags.
 498  * @private_data: Optional user-defined private data sent with the
 499  *   message receipt acknowledgement.
 500  * @private_data_len: Size of the private data buffer, in bytes.
 501  */
 502 int ib_send_cm_mra(struct ib_cm_id *cm_id,
 503                    u8 service_timeout,
 504                    const void *private_data,
 505                    u8 private_data_len);
 506
 507 /**
 508  * ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning
 509  *   to a specified QP state.
 510  * @cm_id: Communication identifier associated with the QP attributes to
 511  *   initialize.
 512  * @qp_attr: On input, specifies the desired QP state.  On output, the
 513  *   mandatory and desired optional attributes will be set in order to
 514  *   modify the QP to the specified state.
 515  * @qp_attr_mask: The QP attribute mask that may be used to transition the
 516  *   QP to the specified state.
 517  *
 518  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 519  * will set all required attributes for the given transition, along with
 520  * known optional attributes.  Users may override the attributes returned from
 521  * this call before calling ib_modify_qp.
 522  */
 523 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
 524                        struct ib_qp_attr *qp_attr,
 525                        int *qp_attr_mask);
 526
 527 struct ib_cm_sidr_req_param {
 528         struct sa_path_rec      *path;
 529         const struct ib_gid_attr *sgid_attr;
 530         __be64                  service_id;
 531         unsigned long           timeout_ms;
 532         const void              *private_data;
 533         u8                      private_data_len;
 534         u8                      max_cm_retries;
 535 };
 536
 537 /**
 538  * ib_send_cm_sidr_req - Sends a service ID resolution request to the
 539  *   remote node.
 540  * @cm_id: Communication identifier that will be associated with the
 541  *   service ID resolution request.
 542  * @param: Service ID resolution request information.
 543  */
 544 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
 545                         struct ib_cm_sidr_req_param *param);
 546
 547 struct ib_cm_sidr_rep_param {
 548         u32                     qp_num;
 549         u32                     qkey;
 550         enum ib_cm_sidr_status  status;
 551         const void              *info;
 552         u8                      info_length;
 553         const void              *private_data;
 554         u8                      private_data_len;
 555         struct rdma_ucm_ece     ece;
 556 };
 557
 558 /**
 559  * ib_send_cm_sidr_rep - Sends a service ID resolution reply to the
 560  *   remote node.
 561  * @cm_id: Communication identifier associated with the received service ID
 562  *   resolution request.
 563  * @param: Service ID resolution reply information.
 564  */
 565 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
 566                         struct ib_cm_sidr_rep_param *param);
 567
 568 /**
 569  * ibcm_reject_msg - return a pointer to a reject message string.
 570  * @reason: Value returned in the REJECT event status field.
 571  */
 572 const char *__attribute_const__ ibcm_reject_msg(int reason);
 573
 574 #endif /* IB_CM_H */