include/rdma/ib_cm.h

   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 */
  42 extern struct class cm_class;
  43
  44 enum 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
  63 enum 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
  72 enum 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
  93 enum 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
 111 struct ib_cm_id;
 112
 113 struct 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
 136 struct 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
 150 enum 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
 186 struct ib_cm_rej_event_param {
 187         enum ib_cm_rej_reason   reason;
 188         void                    *ari;
 189         u8                      ari_length;
 190 };
 191
 192 struct ib_cm_mra_event_param {
 193         u8      service_timeout;
 194 };
 195
 196 struct ib_cm_lap_event_param {
 197         struct ib_sa_path_rec   *alternate_path;
 198 };
 199
 200 enum 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
 217 struct ib_cm_apr_event_param {
 218         enum ib_cm_apr_status   ap_status;
 219         void                    *apr_info;
 220         u8                      info_len;
 221 };
 222
 223 struct ib_cm_sidr_req_event_param {
 224         struct ib_cm_id         *listen_id;
 225         u8                      port;
 226         u16                     pkey;
 227 };
 228
 229 enum 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
 238 struct 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
 246 struct 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  */
 293 typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
 294                              struct ib_cm_event *event);
 295
 296 struct 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  */
 320 struct 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  */
 330 void 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
 339 struct 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  */
 360 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
 361                  struct ib_cm_compare_data *compare_data);
 362
 363 struct 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  */
 391 int ib_send_cm_req(struct ib_cm_id *cm_id,
 392                    struct ib_cm_req_param *param);
 393
 394 struct 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  */
 415 int 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  */
 426 int 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  */
 439 int 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  */
 454 int 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  */
 472 int 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  */
 486 int 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  */
 506 int 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  */
 521 int 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  */
 542 int 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  */
 558 int 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
 565 struct 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  */
 581 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
 582                         struct ib_cm_sidr_req_param *param);
 583
 584 struct 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  */
 601 int 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 */