linux/include/rdma/ib_cm.h
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   1/*
   2 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   3 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   4 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
   5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6 *
   7 * This software is available to you under a choice of one of two
   8 * licenses.  You may choose to be licensed under the terms of the GNU
   9 * General Public License (GPL) Version 2, available from the file
  10 * COPYING in the main directory of this source tree, or the
  11 * OpenIB.org BSD license below:
  12 *
  13 *     Redistribution and use in source and binary forms, with or
  14 *     without modification, are permitted provided that the following
  15 *     conditions are met:
  16 *
  17 *      - Redistributions of source code must retain the above
  18 *        copyright notice, this list of conditions and the following
  19 *        disclaimer.
  20 *
  21 *      - Redistributions in binary form must reproduce the above
  22 *        copyright notice, this list of conditions and the following
  23 *        disclaimer in the documentation and/or other materials
  24 *        provided with the distribution.
  25 *
  26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33 * SOFTWARE.
  34 */
  35#if !defined(IB_CM_H)
  36#define IB_CM_H
  37
  38#include <rdma/ib_mad.h>
  39#include <rdma/ib_sa.h>
  40
  41/* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
  42extern struct class cm_class;
  43
  44enum ib_cm_state {
  45        IB_CM_IDLE,
  46        IB_CM_LISTEN,
  47        IB_CM_REQ_SENT,
  48        IB_CM_REQ_RCVD,
  49        IB_CM_MRA_REQ_SENT,
  50        IB_CM_MRA_REQ_RCVD,
  51        IB_CM_REP_SENT,
  52        IB_CM_REP_RCVD,
  53        IB_CM_MRA_REP_SENT,
  54        IB_CM_MRA_REP_RCVD,
  55        IB_CM_ESTABLISHED,
  56        IB_CM_DREQ_SENT,
  57        IB_CM_DREQ_RCVD,
  58        IB_CM_TIMEWAIT,
  59        IB_CM_SIDR_REQ_SENT,
  60        IB_CM_SIDR_REQ_RCVD
  61};
  62
  63enum ib_cm_lap_state {
  64        IB_CM_LAP_UNINIT,
  65        IB_CM_LAP_IDLE,
  66        IB_CM_LAP_SENT,
  67        IB_CM_LAP_RCVD,
  68        IB_CM_MRA_LAP_SENT,
  69        IB_CM_MRA_LAP_RCVD,
  70};
  71
  72enum ib_cm_event_type {
  73        IB_CM_REQ_ERROR,
  74        IB_CM_REQ_RECEIVED,
  75        IB_CM_REP_ERROR,
  76        IB_CM_REP_RECEIVED,
  77        IB_CM_RTU_RECEIVED,
  78        IB_CM_USER_ESTABLISHED,
  79        IB_CM_DREQ_ERROR,
  80        IB_CM_DREQ_RECEIVED,
  81        IB_CM_DREP_RECEIVED,
  82        IB_CM_TIMEWAIT_EXIT,
  83        IB_CM_MRA_RECEIVED,
  84        IB_CM_REJ_RECEIVED,
  85        IB_CM_LAP_ERROR,
  86        IB_CM_LAP_RECEIVED,
  87        IB_CM_APR_RECEIVED,
  88        IB_CM_SIDR_REQ_ERROR,
  89        IB_CM_SIDR_REQ_RECEIVED,
  90        IB_CM_SIDR_REP_RECEIVED
  91};
  92
  93enum ib_cm_data_size {
  94        IB_CM_REQ_PRIVATE_DATA_SIZE      = 92,
  95        IB_CM_MRA_PRIVATE_DATA_SIZE      = 222,
  96        IB_CM_REJ_PRIVATE_DATA_SIZE      = 148,
  97        IB_CM_REP_PRIVATE_DATA_SIZE      = 196,
  98        IB_CM_RTU_PRIVATE_DATA_SIZE      = 224,
  99        IB_CM_DREQ_PRIVATE_DATA_SIZE     = 220,
 100        IB_CM_DREP_PRIVATE_DATA_SIZE     = 224,
 101        IB_CM_REJ_ARI_LENGTH             = 72,
 102        IB_CM_LAP_PRIVATE_DATA_SIZE      = 168,
 103        IB_CM_APR_PRIVATE_DATA_SIZE      = 148,
 104        IB_CM_APR_INFO_LENGTH            = 72,
 105        IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216,
 106        IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136,
 107        IB_CM_SIDR_REP_INFO_LENGTH       = 72,
 108        IB_CM_COMPARE_SIZE               = 64
 109};
 110
 111struct ib_cm_id;
 112
 113struct ib_cm_req_event_param {
 114        struct ib_cm_id         *listen_id;
 115        u8                      port;
 116
 117        struct ib_sa_path_rec   *primary_path;
 118        struct ib_sa_path_rec   *alternate_path;
 119
 120        __be64                  remote_ca_guid;
 121        u32                     remote_qkey;
 122        u32                     remote_qpn;
 123        enum ib_qp_type         qp_type;
 124
 125        u32                     starting_psn;
 126        u8                      responder_resources;
 127        u8                      initiator_depth;
 128        unsigned int            local_cm_response_timeout:5;
 129        unsigned int            flow_control:1;
 130        unsigned int            remote_cm_response_timeout:5;
 131        unsigned int            retry_count:3;
 132        unsigned int            rnr_retry_count:3;
 133        unsigned int            srq:1;
 134};
 135
 136struct ib_cm_rep_event_param {
 137        __be64                  remote_ca_guid;
 138        u32                     remote_qkey;
 139        u32                     remote_qpn;
 140        u32                     starting_psn;
 141        u8                      responder_resources;
 142        u8                      initiator_depth;
 143        unsigned int            target_ack_delay:5;
 144        unsigned int            failover_accepted:2;
 145        unsigned int            flow_control:1;
 146        unsigned int            rnr_retry_count:3;
 147        unsigned int            srq:1;
 148};
 149
 150enum ib_cm_rej_reason {
 151        IB_CM_REJ_NO_QP                         = 1,
 152        IB_CM_REJ_NO_EEC                        = 2,
 153        IB_CM_REJ_NO_RESOURCES                  = 3,
 154        IB_CM_REJ_TIMEOUT                       = 4,
 155        IB_CM_REJ_UNSUPPORTED                   = 5,
 156        IB_CM_REJ_INVALID_COMM_ID               = 6,
 157        IB_CM_REJ_INVALID_COMM_INSTANCE         = 7,
 158        IB_CM_REJ_INVALID_SERVICE_ID            = 8,
 159        IB_CM_REJ_INVALID_TRANSPORT_TYPE        = 9,
 160        IB_CM_REJ_STALE_CONN                    = 10,
 161        IB_CM_REJ_RDC_NOT_EXIST                 = 11,
 162        IB_CM_REJ_INVALID_GID                   = 12,
 163        IB_CM_REJ_INVALID_LID                   = 13,
 164        IB_CM_REJ_INVALID_SL                    = 14,
 165        IB_CM_REJ_INVALID_TRAFFIC_CLASS         = 15,
 166        IB_CM_REJ_INVALID_HOP_LIMIT             = 16,
 167        IB_CM_REJ_INVALID_PACKET_RATE           = 17,
 168        IB_CM_REJ_INVALID_ALT_GID               = 18,
 169        IB_CM_REJ_INVALID_ALT_LID               = 19,
 170        IB_CM_REJ_INVALID_ALT_SL                = 20,
 171        IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS     = 21,
 172        IB_CM_REJ_INVALID_ALT_HOP_LIMIT         = 22,
 173        IB_CM_REJ_INVALID_ALT_PACKET_RATE       = 23,
 174        IB_CM_REJ_PORT_CM_REDIRECT              = 24,
 175        IB_CM_REJ_PORT_REDIRECT                 = 25,
 176        IB_CM_REJ_INVALID_MTU                   = 26,
 177        IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES   = 27,
 178        IB_CM_REJ_CONSUMER_DEFINED              = 28,
 179        IB_CM_REJ_INVALID_RNR_RETRY             = 29,
 180        IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID       = 30,
 181        IB_CM_REJ_INVALID_CLASS_VERSION         = 31,
 182        IB_CM_REJ_INVALID_FLOW_LABEL            = 32,
 183        IB_CM_REJ_INVALID_ALT_FLOW_LABEL        = 33
 184};
 185
 186struct ib_cm_rej_event_param {
 187        enum ib_cm_rej_reason   reason;
 188        void                    *ari;
 189        u8                      ari_length;
 190};
 191
 192struct ib_cm_mra_event_param {
 193        u8      service_timeout;
 194};
 195
 196struct ib_cm_lap_event_param {
 197        struct ib_sa_path_rec   *alternate_path;
 198};
 199
 200enum ib_cm_apr_status {
 201        IB_CM_APR_SUCCESS,
 202        IB_CM_APR_INVALID_COMM_ID,
 203        IB_CM_APR_UNSUPPORTED,
 204        IB_CM_APR_REJECT,
 205        IB_CM_APR_REDIRECT,
 206        IB_CM_APR_IS_CURRENT,
 207        IB_CM_APR_INVALID_QPN_EECN,
 208        IB_CM_APR_INVALID_LID,
 209        IB_CM_APR_INVALID_GID,
 210        IB_CM_APR_INVALID_FLOW_LABEL,
 211        IB_CM_APR_INVALID_TCLASS,
 212        IB_CM_APR_INVALID_HOP_LIMIT,
 213        IB_CM_APR_INVALID_PACKET_RATE,
 214        IB_CM_APR_INVALID_SL
 215};
 216
 217struct ib_cm_apr_event_param {
 218        enum ib_cm_apr_status   ap_status;
 219        void                    *apr_info;
 220        u8                      info_len;
 221};
 222
 223struct ib_cm_sidr_req_event_param {
 224        struct ib_cm_id         *listen_id;
 225        u8                      port;
 226        u16                     pkey;
 227};
 228
 229enum ib_cm_sidr_status {
 230        IB_SIDR_SUCCESS,
 231        IB_SIDR_UNSUPPORTED,
 232        IB_SIDR_REJECT,
 233        IB_SIDR_NO_QP,
 234        IB_SIDR_REDIRECT,
 235        IB_SIDR_UNSUPPORTED_VERSION
 236};
 237
 238struct ib_cm_sidr_rep_event_param {
 239        enum ib_cm_sidr_status  status;
 240        u32                     qkey;
 241        u32                     qpn;
 242        void                    *info;
 243        u8                      info_len;
 244};
 245
 246struct ib_cm_event {
 247        enum ib_cm_event_type   event;
 248        union {
 249                struct ib_cm_req_event_param    req_rcvd;
 250                struct ib_cm_rep_event_param    rep_rcvd;
 251                /* No data for RTU received events. */
 252                struct ib_cm_rej_event_param    rej_rcvd;
 253                struct ib_cm_mra_event_param    mra_rcvd;
 254                struct ib_cm_lap_event_param    lap_rcvd;
 255                struct ib_cm_apr_event_param    apr_rcvd;
 256                /* No data for DREQ/DREP received events. */
 257                struct ib_cm_sidr_req_event_param sidr_req_rcvd;
 258                struct ib_cm_sidr_rep_event_param sidr_rep_rcvd;
 259                enum ib_wc_status               send_status;
 260        } param;
 261
 262        void                    *private_data;
 263};
 264
 265#define CM_REQ_ATTR_ID          cpu_to_be16(0x0010)
 266#define CM_MRA_ATTR_ID          cpu_to_be16(0x0011)
 267#define CM_REJ_ATTR_ID          cpu_to_be16(0x0012)
 268#define CM_REP_ATTR_ID          cpu_to_be16(0x0013)
 269#define CM_RTU_ATTR_ID          cpu_to_be16(0x0014)
 270#define CM_DREQ_ATTR_ID         cpu_to_be16(0x0015)
 271#define CM_DREP_ATTR_ID         cpu_to_be16(0x0016)
 272#define CM_SIDR_REQ_ATTR_ID     cpu_to_be16(0x0017)
 273#define CM_SIDR_REP_ATTR_ID     cpu_to_be16(0x0018)
 274#define CM_LAP_ATTR_ID          cpu_to_be16(0x0019)
 275#define CM_APR_ATTR_ID          cpu_to_be16(0x001A)
 276
 277/**
 278 * ib_cm_handler - User-defined callback to process communication events.
 279 * @cm_id: Communication identifier associated with the reported event.
 280 * @event: Information about the communication event.
 281 *
 282 * IB_CM_REQ_RECEIVED and IB_CM_SIDR_REQ_RECEIVED communication events
 283 * generated as a result of listen requests result in the allocation of a
 284 * new @cm_id.  The new @cm_id is returned to the user through this callback.
 285 * Clients are responsible for destroying the new @cm_id.  For peer-to-peer
 286 * IB_CM_REQ_RECEIVED and all other events, the returned @cm_id corresponds
 287 * to a user's existing communication identifier.
 288 *
 289 * Users may not call ib_destroy_cm_id while in the context of this callback;
 290 * however, returning a non-zero value instructs the communication manager to
 291 * destroy the @cm_id after the callback completes.
 292 */
 293typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
 294                             struct ib_cm_event *event);
 295
 296struct ib_cm_id {
 297        ib_cm_handler           cm_handler;
 298        void                    *context;
 299        struct ib_device        *device;
 300        __be64                  service_id;
 301        __be64                  service_mask;
 302        enum ib_cm_state        state;          /* internal CM/debug use */
 303        enum ib_cm_lap_state    lap_state;      /* internal CM/debug use */
 304        __be32                  local_id;
 305        __be32                  remote_id;
 306        u32                     remote_cm_qpn;  /* 1 unless redirected */
 307};
 308
 309/**
 310 * ib_create_cm_id - Allocate a communication identifier.
 311 * @device: Device associated with the cm_id.  All related communication will
 312 * be associated with the specified device.
 313 * @cm_handler: Callback invoked to notify the user of CM events.
 314 * @context: User specified context associated with the communication
 315 *   identifier.
 316 *
 317 * Communication identifiers are used to track connection states, service
 318 * ID resolution requests, and listen requests.
 319 */
 320struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
 321                                 ib_cm_handler cm_handler,
 322                                 void *context);
 323
 324/**
 325 * ib_destroy_cm_id - Destroy a connection identifier.
 326 * @cm_id: Connection identifier to destroy.
 327 *
 328 * This call blocks until the connection identifier is destroyed.
 329 */
 330void ib_destroy_cm_id(struct ib_cm_id *cm_id);
 331
 332#define IB_SERVICE_ID_AGN_MASK  cpu_to_be64(0xFF00000000000000ULL)
 333#define IB_CM_ASSIGN_SERVICE_ID cpu_to_be64(0x0200000000000000ULL)
 334#define IB_CMA_SERVICE_ID       cpu_to_be64(0x0000000001000000ULL)
 335#define IB_CMA_SERVICE_ID_MASK  cpu_to_be64(0xFFFFFFFFFF000000ULL)
 336#define IB_SDP_SERVICE_ID       cpu_to_be64(0x0000000000010000ULL)
 337#define IB_SDP_SERVICE_ID_MASK  cpu_to_be64(0xFFFFFFFFFFFF0000ULL)
 338
 339struct ib_cm_compare_data {
 340        u8  data[IB_CM_COMPARE_SIZE];
 341        u8  mask[IB_CM_COMPARE_SIZE];
 342};
 343
 344/**
 345 * ib_cm_listen - Initiates listening on the specified service ID for
 346 *   connection and service ID resolution requests.
 347 * @cm_id: Connection identifier associated with the listen request.
 348 * @service_id: Service identifier matched against incoming connection
 349 *   and service ID resolution requests.  The service ID should be specified
 350 *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
 351 *   assign a service ID to the caller.
 352 * @service_mask: Mask applied to service ID used to listen across a
 353 *   range of service IDs.  If set to 0, the service ID is matched
 354 *   exactly.  This parameter is ignored if %service_id is set to
 355 *   IB_CM_ASSIGN_SERVICE_ID.
 356 * @compare_data: This parameter is optional.  It specifies data that must
 357 *   appear in the private data of a connection request for the specified
 358 *   listen request.
 359 */
 360int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 361                 struct ib_cm_compare_data *compare_data);
 362
 363struct ib_cm_req_param {
 364        struct ib_sa_path_rec   *primary_path;
 365        struct ib_sa_path_rec   *alternate_path;
 366        __be64                  service_id;
 367        u32                     qp_num;
 368        enum ib_qp_type         qp_type;
 369        u32                     starting_psn;
 370        const void              *private_data;
 371        u8                      private_data_len;
 372        u8                      peer_to_peer;
 373        u8                      responder_resources;
 374        u8                      initiator_depth;
 375        u8                      remote_cm_response_timeout;
 376        u8                      flow_control;
 377        u8                      local_cm_response_timeout;
 378        u8                      retry_count;
 379        u8                      rnr_retry_count;
 380        u8                      max_cm_retries;
 381        u8                      srq;
 382};
 383
 384/**
 385 * ib_send_cm_req - Sends a connection request to the remote node.
 386 * @cm_id: Connection identifier that will be associated with the
 387 *   connection request.
 388 * @param: Connection request information needed to establish the
 389 *   connection.
 390 */
 391int ib_send_cm_req(struct ib_cm_id *cm_id,
 392                   struct ib_cm_req_param *param);
 393
 394struct ib_cm_rep_param {
 395        u32             qp_num;
 396        u32             starting_psn;
 397        const void      *private_data;
 398        u8              private_data_len;
 399        u8              responder_resources;
 400        u8              initiator_depth;
 401        u8              failover_accepted;
 402        u8              flow_control;
 403        u8              rnr_retry_count;
 404        u8              srq;
 405};
 406
 407/**
 408 * ib_send_cm_rep - Sends a connection reply in response to a connection
 409 *   request.
 410 * @cm_id: Connection identifier that will be associated with the
 411 *   connection request.
 412 * @param: Connection reply information needed to establish the
 413 *   connection.
 414 */
 415int ib_send_cm_rep(struct ib_cm_id *cm_id,
 416                   struct ib_cm_rep_param *param);
 417
 418/**
 419 * ib_send_cm_rtu - Sends a connection ready to use message in response
 420 *   to a connection reply message.
 421 * @cm_id: Connection identifier associated with the connection request.
 422 * @private_data: Optional user-defined private data sent with the
 423 *   ready to use message.
 424 * @private_data_len: Size of the private data buffer, in bytes.
 425 */
 426int ib_send_cm_rtu(struct ib_cm_id *cm_id,
 427                   const void *private_data,
 428                   u8 private_data_len);
 429
 430/**
 431 * ib_send_cm_dreq - Sends a disconnection request for an existing
 432 *   connection.
 433 * @cm_id: Connection identifier associated with the connection being
 434 *   released.
 435 * @private_data: Optional user-defined private data sent with the
 436 *   disconnection request message.
 437 * @private_data_len: Size of the private data buffer, in bytes.
 438 */
 439int ib_send_cm_dreq(struct ib_cm_id *cm_id,
 440                    const void *private_data,
 441                    u8 private_data_len);
 442
 443/**
 444 * ib_send_cm_drep - Sends a disconnection reply to a disconnection request.
 445 * @cm_id: Connection identifier associated with the connection being
 446 *   released.
 447 * @private_data: Optional user-defined private data sent with the
 448 *   disconnection reply message.
 449 * @private_data_len: Size of the private data buffer, in bytes.
 450 *
 451 * If the cm_id is in the correct state, the CM will transition the connection
 452 * to the timewait state, even if an error occurs sending the DREP message.
 453 */
 454int ib_send_cm_drep(struct ib_cm_id *cm_id,
 455                    const void *private_data,
 456                    u8 private_data_len);
 457
 458/**
 459 * ib_cm_notify - Notifies the CM of an event reported to the consumer.
 460 * @cm_id: Connection identifier to transition to established.
 461 * @event: Type of event.
 462 *
 463 * This routine should be invoked by users to notify the CM of relevant
 464 * communication events.  Events that should be reported to the CM and
 465 * when to report them are:
 466 *
 467 * IB_EVENT_COMM_EST - Used when a message is received on a connected
 468 *    QP before an RTU has been received.
 469 * IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over
 470 *   to the alternate path.
 471 */
 472int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event);
 473
 474/**
 475 * ib_send_cm_rej - Sends a connection rejection message to the
 476 *   remote node.
 477 * @cm_id: Connection identifier associated with the connection being
 478 *   rejected.
 479 * @reason: Reason for the connection request rejection.
 480 * @ari: Optional additional rejection information.
 481 * @ari_length: Size of the additional rejection information, in bytes.
 482 * @private_data: Optional user-defined private data sent with the
 483 *   rejection message.
 484 * @private_data_len: Size of the private data buffer, in bytes.
 485 */
 486int ib_send_cm_rej(struct ib_cm_id *cm_id,
 487                   enum ib_cm_rej_reason reason,
 488                   void *ari,
 489                   u8 ari_length,
 490                   const void *private_data,
 491                   u8 private_data_len);
 492
 493#define IB_CM_MRA_FLAG_DELAY 0x80  /* Send MRA only after a duplicate msg */
 494
 495/**
 496 * ib_send_cm_mra - Sends a message receipt acknowledgement to a connection
 497 *   message.
 498 * @cm_id: Connection identifier associated with the connection message.
 499 * @service_timeout: The lower 5-bits specify the maximum time required for
 500 *   the sender to reply to the connection message.  The upper 3-bits
 501 *   specify additional control flags.
 502 * @private_data: Optional user-defined private data sent with the
 503 *   message receipt acknowledgement.
 504 * @private_data_len: Size of the private data buffer, in bytes.
 505 */
 506int ib_send_cm_mra(struct ib_cm_id *cm_id,
 507                   u8 service_timeout,
 508                   const void *private_data,
 509                   u8 private_data_len);
 510
 511/**
 512 * ib_send_cm_lap - Sends a load alternate path request.
 513 * @cm_id: Connection identifier associated with the load alternate path
 514 *   message.
 515 * @alternate_path: A path record that identifies the alternate path to
 516 *   load.
 517 * @private_data: Optional user-defined private data sent with the
 518 *   load alternate path message.
 519 * @private_data_len: Size of the private data buffer, in bytes.
 520 */
 521int ib_send_cm_lap(struct ib_cm_id *cm_id,
 522                   struct ib_sa_path_rec *alternate_path,
 523                   const void *private_data,
 524                   u8 private_data_len);
 525
 526/**
 527 * ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning
 528 *   to a specified QP state.
 529 * @cm_id: Communication identifier associated with the QP attributes to
 530 *   initialize.
 531 * @qp_attr: On input, specifies the desired QP state.  On output, the
 532 *   mandatory and desired optional attributes will be set in order to
 533 *   modify the QP to the specified state.
 534 * @qp_attr_mask: The QP attribute mask that may be used to transition the
 535 *   QP to the specified state.
 536 *
 537 * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 538 * will set all required attributes for the given transition, along with
 539 * known optional attributes.  Users may override the attributes returned from
 540 * this call before calling ib_modify_qp.
 541 */
 542int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
 543                       struct ib_qp_attr *qp_attr,
 544                       int *qp_attr_mask);
 545
 546/**
 547 * ib_send_cm_apr - Sends an alternate path response message in response to
 548 *   a load alternate path request.
 549 * @cm_id: Connection identifier associated with the alternate path response.
 550 * @status: Reply status sent with the alternate path response.
 551 * @info: Optional additional information sent with the alternate path
 552 *   response.
 553 * @info_length: Size of the additional information, in bytes.
 554 * @private_data: Optional user-defined private data sent with the
 555 *   alternate path response message.
 556 * @private_data_len: Size of the private data buffer, in bytes.
 557 */
 558int ib_send_cm_apr(struct ib_cm_id *cm_id,
 559                   enum ib_cm_apr_status status,
 560                   void *info,
 561                   u8 info_length,
 562                   const void *private_data,
 563                   u8 private_data_len);
 564
 565struct ib_cm_sidr_req_param {
 566        struct ib_sa_path_rec   *path;
 567        __be64                  service_id;
 568        int                     timeout_ms;
 569        const void              *private_data;
 570        u8                      private_data_len;
 571        u8                      max_cm_retries;
 572};
 573
 574/**
 575 * ib_send_cm_sidr_req - Sends a service ID resolution request to the
 576 *   remote node.
 577 * @cm_id: Communication identifier that will be associated with the
 578 *   service ID resolution request.
 579 * @param: Service ID resolution request information.
 580 */
 581int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
 582                        struct ib_cm_sidr_req_param *param);
 583
 584struct ib_cm_sidr_rep_param {
 585        u32                     qp_num;
 586        u32                     qkey;
 587        enum ib_cm_sidr_status  status;
 588        const void              *info;
 589        u8                      info_length;
 590        const void              *private_data;
 591        u8                      private_data_len;
 592};
 593
 594/**
 595 * ib_send_cm_sidr_rep - Sends a service ID resolution reply to the
 596 *   remote node.
 597 * @cm_id: Communication identifier associated with the received service ID
 598 *   resolution request.
 599 * @param: Service ID resolution reply information.
 600 */
 601int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
 602                        struct ib_cm_sidr_rep_param *param);
 603
 604#endif /* IB_CM_H */
 605
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