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