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_TCP   = 0x0106,
  69         RDMA_PS_UDP   = 0x0111,
  70 };
  71
  72 struct rdma_addr {
  73         struct sockaddr_storage src_addr;
  74         struct sockaddr_storage dst_addr;
  75         struct rdma_dev_addr dev_addr;
  76 };
  77
  78 struct rdma_route {
  79         struct rdma_addr addr;
  80         struct ib_sa_path_rec *path_rec;
  81         int num_paths;
  82 };
  83
  84 struct rdma_conn_param {
  85         const void *private_data;
  86         u8 private_data_len;
  87         u8 responder_resources;
  88         u8 initiator_depth;
  89         u8 flow_control;
  90         u8 retry_count;         /* ignored when accepting */
  91         u8 rnr_retry_count;
  92         /* Fields below ignored if a QP is created on the rdma_cm_id. */
  93         u8 srq;
  94         u32 qp_num;
  95 };
  96
  97 struct rdma_ud_param {
  98         const void *private_data;
  99         u8 private_data_len;
 100         struct ib_ah_attr ah_attr;
 101         u32 qp_num;
 102         u32 qkey;
 103 };
 104
 105 struct rdma_cm_event {
 106         enum rdma_cm_event_type  event;
 107         int                      status;
 108         union {
 109                 struct rdma_conn_param  conn;
 110                 struct rdma_ud_param    ud;
 111         } param;
 112 };
 113
 114 struct rdma_cm_id;
 115
 116 /**
 117  * rdma_cm_event_handler - Callback used to report user events.
 118  *
 119  * Notes: Users may not call rdma_destroy_id from this callback to destroy
 120  *   the passed in id, or a corresponding listen id.  Returning a
 121  *   non-zero value from the callback will destroy the passed in id.
 122  */
 123 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
 124                                      struct rdma_cm_event *event);
 125
 126 struct rdma_cm_id {
 127         struct ib_device        *device;
 128         void                    *context;
 129         struct ib_qp            *qp;
 130         rdma_cm_event_handler    event_handler;
 131         struct rdma_route        route;
 132         enum rdma_port_space     ps;
 133         u8                       port_num;
 134 };
 135
 136 /**
 137  * rdma_create_id - Create an RDMA identifier.
 138  *
 139  * @event_handler: User callback invoked to report events associated with the
 140  *   returned rdma_id.
 141  * @context: User specified context associated with the id.
 142  * @ps: RDMA port space.
 143  */
 144 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 145                                   void *context, enum rdma_port_space ps);
 146
 147 /**
 148   * rdma_destroy_id - Destroys an RDMA identifier.
 149   *
 150   * @id: RDMA identifier.
 151   *
 152   * Note: calling this function has the effect of canceling in-flight
 153   * asynchronous operations associated with the id.
 154   */
 155 void rdma_destroy_id(struct rdma_cm_id *id);
 156
 157 /**
 158  * rdma_bind_addr - Bind an RDMA identifier to a source address and
 159  *   associated RDMA device, if needed.
 160  *
 161  * @id: RDMA identifier.
 162  * @addr: Local address information.  Wildcard values are permitted.
 163  *
 164  * This associates a source address with the RDMA identifier before calling
 165  * rdma_listen.  If a specific local address is given, the RDMA identifier will
 166  * be bound to a local RDMA device.
 167  */
 168 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
 169
 170 /**
 171  * rdma_resolve_addr - Resolve destination and optional source addresses
 172  *   from IP addresses to an RDMA address.  If successful, the specified
 173  *   rdma_cm_id will be bound to a local device.
 174  *
 175  * @id: RDMA identifier.
 176  * @src_addr: Source address information.  This parameter may be NULL.
 177  * @dst_addr: Destination address information.
 178  * @timeout_ms: Time to wait for resolution to complete.
 179  */
 180 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
 181                       struct sockaddr *dst_addr, int timeout_ms);
 182
 183 /**
 184  * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
 185  *   into route information needed to establish a connection.
 186  *
 187  * This is called on the client side of a connection.
 188  * Users must have first called rdma_resolve_addr to resolve a dst_addr
 189  * into an RDMA address before calling this routine.
 190  */
 191 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
 192
 193 /**
 194  * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
 195  * identifier.
 196  *
 197  * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
 198  * through their states.
 199  */
 200 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 201                    struct ib_qp_init_attr *qp_init_attr);
 202
 203 /**
 204  * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
 205  * identifier.
 206  *
 207  * Users must destroy any QP associated with an RDMA identifier before
 208  * destroying the RDMA ID.
 209  */
 210 void rdma_destroy_qp(struct rdma_cm_id *id);
 211
 212 /**
 213  * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
 214  *   to a specified QP state.
 215  * @id: Communication identifier associated with the QP attributes to
 216  *   initialize.
 217  * @qp_attr: On input, specifies the desired QP state.  On output, the
 218  *   mandatory and desired optional attributes will be set in order to
 219  *   modify the QP to the specified state.
 220  * @qp_attr_mask: The QP attribute mask that may be used to transition the
 221  *   QP to the specified state.
 222  *
 223  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 224  * will set all required attributes for the given transition, along with
 225  * known optional attributes.  Users may override the attributes returned from
 226  * this call before calling ib_modify_qp.
 227  *
 228  * Users that wish to have their QP automatically transitioned through its
 229  * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
 230  */
 231 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 232                        int *qp_attr_mask);
 233
 234 /**
 235  * rdma_connect - Initiate an active connection request.
 236  * @id: Connection identifier to connect.
 237  * @conn_param: Connection information used for connected QPs.
 238  *
 239  * Users must have resolved a route for the rdma_cm_id to connect with
 240  * by having called rdma_resolve_route before calling this routine.
 241  *
 242  * This call will either connect to a remote QP or obtain remote QP
 243  * information for unconnected rdma_cm_id's.  The actual operation is
 244  * based on the rdma_cm_id's port space.
 245  */
 246 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 247
 248 /**
 249  * rdma_listen - This function is called by the passive side to
 250  *   listen for incoming connection requests.
 251  *
 252  * Users must have bound the rdma_cm_id to a local address by calling
 253  * rdma_bind_addr before calling this routine.
 254  */
 255 int rdma_listen(struct rdma_cm_id *id, int backlog);
 256
 257 /**
 258  * rdma_accept - Called to accept a connection request or response.
 259  * @id: Connection identifier associated with the request.
 260  * @conn_param: Information needed to establish the connection.  This must be
 261  *   provided if accepting a connection request.  If accepting a connection
 262  *   response, this parameter must be NULL.
 263  *
 264  * Typically, this routine is only called by the listener to accept a connection
 265  * request.  It must also be called on the active side of a connection if the
 266  * user is performing their own QP transitions.
 267  *
 268  * In the case of error, a reject message is sent to the remote side and the
 269  * state of the qp associated with the id is modified to error, such that any
 270  * previously posted receive buffers would be flushed.
 271  */
 272 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 273
 274 /**
 275  * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
 276  * occurred on the connection.
 277  * @id: Connection identifier to transition to established.
 278  * @event: Asynchronous event.
 279  *
 280  * This routine should be invoked by users to notify the CM of relevant
 281  * communication events.  Events that should be reported to the CM and
 282  * when to report them are:
 283  *
 284  * IB_EVENT_COMM_EST - Used when a message is received on a connected
 285  *    QP before an RTU has been received.
 286  */
 287 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
 288
 289 /**
 290  * rdma_reject - Called to reject a connection request or response.
 291  */
 292 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
 293                 u8 private_data_len);
 294
 295 /**
 296  * rdma_disconnect - This function disconnects the associated QP and
 297  *   transitions it into the error state.
 298  */
 299 int rdma_disconnect(struct rdma_cm_id *id);
 300
 301 /**
 302  * rdma_join_multicast - Join the multicast group specified by the given
 303  *   address.
 304  * @id: Communication identifier associated with the request.
 305  * @addr: Multicast address identifying the group to join.
 306  * @context: User-defined context associated with the join request, returned
 307  * to the user through the private_data pointer in multicast events.
 308  */
 309 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
 310                         void *context);
 311
 312 /**
 313  * rdma_leave_multicast - Leave the multicast group specified by the given
 314  *   address.
 315  */
 316 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
 317
 318 /**
 319  * rdma_set_service_type - Set the type of service associated with a
 320  *   connection identifier.
 321  * @id: Communication identifier to associated with service type.
 322  * @tos: Type of service.
 323  *
 324  * The type of service is interpretted as a differentiated service
 325  * field (RFC 2474).  The service type should be specified before
 326  * performing route resolution, as existing communication on the
 327  * connection identifier may be unaffected.  The type of service
 328  * requested may not be supported by the network to all destinations.
 329  */
 330 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
 331
 332 #endif /* RDMA_CM_H */