include/rdma/rdma_cm.h

   1 /*
   2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #if !defined(RDMA_CM_H)
  35 #define RDMA_CM_H
  36
  37 #include <linux/socket.h>
  38 #include <linux/in6.h>
  39 #include <rdma/ib_addr.h>
  40 #include <rdma/ib_sa.h>
  41
  42 /*
  43  * Upon receiving a device removal event, users must destroy the associated
  44  * RDMA identifier and release all resources allocated with the device.
  45  */
  46 enum rdma_cm_event_type {
  47         RDMA_CM_EVENT_ADDR_RESOLVED,
  48         RDMA_CM_EVENT_ADDR_ERROR,
  49         RDMA_CM_EVENT_ROUTE_RESOLVED,
  50         RDMA_CM_EVENT_ROUTE_ERROR,
  51         RDMA_CM_EVENT_CONNECT_REQUEST,
  52         RDMA_CM_EVENT_CONNECT_RESPONSE,
  53         RDMA_CM_EVENT_CONNECT_ERROR,
  54         RDMA_CM_EVENT_UNREACHABLE,
  55         RDMA_CM_EVENT_REJECTED,
  56         RDMA_CM_EVENT_ESTABLISHED,
  57         RDMA_CM_EVENT_DISCONNECTED,
  58         RDMA_CM_EVENT_DEVICE_REMOVAL,
  59         RDMA_CM_EVENT_MULTICAST_JOIN,
  60         RDMA_CM_EVENT_MULTICAST_ERROR,
  61         RDMA_CM_EVENT_ADDR_CHANGE,
  62         RDMA_CM_EVENT_TIMEWAIT_EXIT
  63 };
  64
  65 enum rdma_port_space {
  66         RDMA_PS_SDP   = 0x0001,
  67         RDMA_PS_IPOIB = 0x0002,
  68         RDMA_PS_IB    = 0x013F,
  69         RDMA_PS_TCP   = 0x0106,
  70         RDMA_PS_UDP   = 0x0111,
  71 };
  72
  73 struct rdma_addr {
  74         struct sockaddr_storage src_addr;
  75         struct sockaddr_storage dst_addr;
  76         struct rdma_dev_addr dev_addr;
  77 };
  78
  79 struct rdma_route {
  80         struct rdma_addr addr;
  81         struct ib_sa_path_rec *path_rec;
  82         int num_paths;
  83 };
  84
  85 struct rdma_conn_param {
  86         const void *private_data;
  87         u8 private_data_len;
  88         u8 responder_resources;
  89         u8 initiator_depth;
  90         u8 flow_control;
  91         u8 retry_count;         /* ignored when accepting */
  92         u8 rnr_retry_count;
  93         /* Fields below ignored if a QP is created on the rdma_cm_id. */
  94         u8 srq;
  95         u32 qp_num;
  96 };
  97
  98 struct rdma_ud_param {
  99         const void *private_data;
 100         u8 private_data_len;
 101         struct ib_ah_attr ah_attr;
 102         u32 qp_num;
 103         u32 qkey;
 104 };
 105
 106 struct rdma_cm_event {
 107         enum rdma_cm_event_type  event;
 108         int                      status;
 109         union {
 110                 struct rdma_conn_param  conn;
 111                 struct rdma_ud_param    ud;
 112         } param;
 113 };
 114
 115 enum rdma_cm_state {
 116         RDMA_CM_IDLE,
 117         RDMA_CM_ADDR_QUERY,
 118         RDMA_CM_ADDR_RESOLVED,
 119         RDMA_CM_ROUTE_QUERY,
 120         RDMA_CM_ROUTE_RESOLVED,
 121         RDMA_CM_CONNECT,
 122         RDMA_CM_DISCONNECT,
 123         RDMA_CM_ADDR_BOUND,
 124         RDMA_CM_LISTEN,
 125         RDMA_CM_DEVICE_REMOVAL,
 126         RDMA_CM_DESTROYING
 127 };
 128
 129 struct rdma_cm_id;
 130
 131 /**
 132  * rdma_cm_event_handler - Callback used to report user events.
 133  *
 134  * Notes: Users may not call rdma_destroy_id from this callback to destroy
 135  *   the passed in id, or a corresponding listen id.  Returning a
 136  *   non-zero value from the callback will destroy the passed in id.
 137  */
 138 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
 139                                      struct rdma_cm_event *event);
 140
 141 struct rdma_cm_id {
 142         struct ib_device        *device;
 143         void                    *context;
 144         struct ib_qp            *qp;
 145         rdma_cm_event_handler    event_handler;
 146         struct rdma_route        route;
 147         enum rdma_port_space     ps;
 148         enum ib_qp_type          qp_type;
 149         u8                       port_num;
 150 };
 151
 152 /**
 153  * rdma_create_id - Create an RDMA identifier.
 154  *
 155  * @event_handler: User callback invoked to report events associated with the
 156  *   returned rdma_id.
 157  * @context: User specified context associated with the id.
 158  * @ps: RDMA port space.
 159  * @qp_type: type of queue pair associated with the id.
 160  */
 161 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 162                                   void *context, enum rdma_port_space ps,
 163                                   enum ib_qp_type qp_type);
 164
 165 /**
 166   * rdma_destroy_id - Destroys an RDMA identifier.
 167   *
 168   * @id: RDMA identifier.
 169   *
 170   * Note: calling this function has the effect of canceling in-flight
 171   * asynchronous operations associated with the id.
 172   */
 173 void rdma_destroy_id(struct rdma_cm_id *id);
 174
 175 /**
 176  * rdma_bind_addr - Bind an RDMA identifier to a source address and
 177  *   associated RDMA device, if needed.
 178  *
 179  * @id: RDMA identifier.
 180  * @addr: Local address information.  Wildcard values are permitted.
 181  *
 182  * This associates a source address with the RDMA identifier before calling
 183  * rdma_listen.  If a specific local address is given, the RDMA identifier will
 184  * be bound to a local RDMA device.
 185  */
 186 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
 187
 188 /**
 189  * rdma_resolve_addr - Resolve destination and optional source addresses
 190  *   from IP addresses to an RDMA address.  If successful, the specified
 191  *   rdma_cm_id will be bound to a local device.
 192  *
 193  * @id: RDMA identifier.
 194  * @src_addr: Source address information.  This parameter may be NULL.
 195  * @dst_addr: Destination address information.
 196  * @timeout_ms: Time to wait for resolution to complete.
 197  */
 198 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
 199                       struct sockaddr *dst_addr, int timeout_ms);
 200
 201 /**
 202  * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
 203  *   into route information needed to establish a connection.
 204  *
 205  * This is called on the client side of a connection.
 206  * Users must have first called rdma_resolve_addr to resolve a dst_addr
 207  * into an RDMA address before calling this routine.
 208  */
 209 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
 210
 211 /**
 212  * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
 213  * identifier.
 214  *
 215  * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
 216  * through their states.
 217  */
 218 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 219                    struct ib_qp_init_attr *qp_init_attr);
 220
 221 /**
 222  * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
 223  * identifier.
 224  *
 225  * Users must destroy any QP associated with an RDMA identifier before
 226  * destroying the RDMA ID.
 227  */
 228 void rdma_destroy_qp(struct rdma_cm_id *id);
 229
 230 /**
 231  * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
 232  *   to a specified QP state.
 233  * @id: Communication identifier associated with the QP attributes to
 234  *   initialize.
 235  * @qp_attr: On input, specifies the desired QP state.  On output, the
 236  *   mandatory and desired optional attributes will be set in order to
 237  *   modify the QP to the specified state.
 238  * @qp_attr_mask: The QP attribute mask that may be used to transition the
 239  *   QP to the specified state.
 240  *
 241  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 242  * will set all required attributes for the given transition, along with
 243  * known optional attributes.  Users may override the attributes returned from
 244  * this call before calling ib_modify_qp.
 245  *
 246  * Users that wish to have their QP automatically transitioned through its
 247  * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
 248  */
 249 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 250                        int *qp_attr_mask);
 251
 252 /**
 253  * rdma_connect - Initiate an active connection request.
 254  * @id: Connection identifier to connect.
 255  * @conn_param: Connection information used for connected QPs.
 256  *
 257  * Users must have resolved a route for the rdma_cm_id to connect with
 258  * by having called rdma_resolve_route before calling this routine.
 259  *
 260  * This call will either connect to a remote QP or obtain remote QP
 261  * information for unconnected rdma_cm_id's.  The actual operation is
 262  * based on the rdma_cm_id's port space.
 263  */
 264 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 265
 266 /**
 267  * rdma_listen - This function is called by the passive side to
 268  *   listen for incoming connection requests.
 269  *
 270  * Users must have bound the rdma_cm_id to a local address by calling
 271  * rdma_bind_addr before calling this routine.
 272  */
 273 int rdma_listen(struct rdma_cm_id *id, int backlog);
 274
 275 /**
 276  * rdma_accept - Called to accept a connection request or response.
 277  * @id: Connection identifier associated with the request.
 278  * @conn_param: Information needed to establish the connection.  This must be
 279  *   provided if accepting a connection request.  If accepting a connection
 280  *   response, this parameter must be NULL.
 281  *
 282  * Typically, this routine is only called by the listener to accept a connection
 283  * request.  It must also be called on the active side of a connection if the
 284  * user is performing their own QP transitions.
 285  *
 286  * In the case of error, a reject message is sent to the remote side and the
 287  * state of the qp associated with the id is modified to error, such that any
 288  * previously posted receive buffers would be flushed.
 289  */
 290 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 291
 292 /**
 293  * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
 294  * occurred on the connection.
 295  * @id: Connection identifier to transition to established.
 296  * @event: Asynchronous event.
 297  *
 298  * This routine should be invoked by users to notify the CM of relevant
 299  * communication events.  Events that should be reported to the CM and
 300  * when to report them are:
 301  *
 302  * IB_EVENT_COMM_EST - Used when a message is received on a connected
 303  *    QP before an RTU has been received.
 304  */
 305 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
 306
 307 /**
 308  * rdma_reject - Called to reject a connection request or response.
 309  */
 310 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
 311                 u8 private_data_len);
 312
 313 /**
 314  * rdma_disconnect - This function disconnects the associated QP and
 315  *   transitions it into the error state.
 316  */
 317 int rdma_disconnect(struct rdma_cm_id *id);
 318
 319 /**
 320  * rdma_join_multicast - Join the multicast group specified by the given
 321  *   address.
 322  * @id: Communication identifier associated with the request.
 323  * @addr: Multicast address identifying the group to join.
 324  * @context: User-defined context associated with the join request, returned
 325  * to the user through the private_data pointer in multicast events.
 326  */
 327 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
 328                         void *context);
 329
 330 /**
 331  * rdma_leave_multicast - Leave the multicast group specified by the given
 332  *   address.
 333  */
 334 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
 335
 336 /**
 337  * rdma_set_service_type - Set the type of service associated with a
 338  *   connection identifier.
 339  * @id: Communication identifier to associated with service type.
 340  * @tos: Type of service.
 341  *
 342  * The type of service is interpretted as a differentiated service
 343  * field (RFC 2474).  The service type should be specified before
 344  * performing route resolution, as existing communication on the
 345  * connection identifier may be unaffected.  The type of service
 346  * requested may not be supported by the network to all destinations.
 347  */
 348 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
 349
 350 /**
 351  * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
 352  *    the rdma_cm_id.
 353  * @id: Communication identifier to configure.
 354  * @reuse: Value indicating if the bound address is reusable.
 355  *
 356  * Reuse must be set before an address is bound to the id.
 357  */
 358 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
 359
 360 #endif /* RDMA_CM_H */