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         RDMA_PS_SCTP  = 0x0183
  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 struct rdma_cm_id;
 116
 117 /**
 118  * rdma_cm_event_handler - Callback used to report user events.
 119  *
 120  * Notes: Users may not call rdma_destroy_id from this callback to destroy
 121  *   the passed in id, or a corresponding listen id.  Returning a
 122  *   non-zero value from the callback will destroy the passed in id.
 123  */
 124 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
 125                                      struct rdma_cm_event *event);
 126
 127 struct rdma_cm_id {
 128         struct ib_device        *device;
 129         void                    *context;
 130         struct ib_qp            *qp;
 131         rdma_cm_event_handler    event_handler;
 132         struct rdma_route        route;
 133         enum rdma_port_space     ps;
 134         u8                       port_num;
 135 };
 136
 137 /**
 138  * rdma_create_id - Create an RDMA identifier.
 139  *
 140  * @event_handler: User callback invoked to report events associated with the
 141  *   returned rdma_id.
 142  * @context: User specified context associated with the id.
 143  * @ps: RDMA port space.
 144  */
 145 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 146                                   void *context, enum rdma_port_space ps);
 147
 148 /**
 149   * rdma_destroy_id - Destroys an RDMA identifier.
 150   *
 151   * @id: RDMA identifier.
 152   *
 153   * Note: calling this function has the effect of canceling in-flight
 154   * asynchronous operations associated with the id.
 155   */
 156 void rdma_destroy_id(struct rdma_cm_id *id);
 157
 158 /**
 159  * rdma_bind_addr - Bind an RDMA identifier to a source address and
 160  *   associated RDMA device, if needed.
 161  *
 162  * @id: RDMA identifier.
 163  * @addr: Local address information.  Wildcard values are permitted.
 164  *
 165  * This associates a source address with the RDMA identifier before calling
 166  * rdma_listen.  If a specific local address is given, the RDMA identifier will
 167  * be bound to a local RDMA device.
 168  */
 169 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
 170
 171 /**
 172  * rdma_resolve_addr - Resolve destination and optional source addresses
 173  *   from IP addresses to an RDMA address.  If successful, the specified
 174  *   rdma_cm_id will be bound to a local device.
 175  *
 176  * @id: RDMA identifier.
 177  * @src_addr: Source address information.  This parameter may be NULL.
 178  * @dst_addr: Destination address information.
 179  * @timeout_ms: Time to wait for resolution to complete.
 180  */
 181 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
 182                       struct sockaddr *dst_addr, int timeout_ms);
 183
 184 /**
 185  * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
 186  *   into route information needed to establish a connection.
 187  *
 188  * This is called on the client side of a connection.
 189  * Users must have first called rdma_resolve_addr to resolve a dst_addr
 190  * into an RDMA address before calling this routine.
 191  */
 192 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
 193
 194 /**
 195  * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
 196  * identifier.
 197  *
 198  * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
 199  * through their states.
 200  */
 201 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 202                    struct ib_qp_init_attr *qp_init_attr);
 203
 204 /**
 205  * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
 206  * identifier.
 207  *
 208  * Users must destroy any QP associated with an RDMA identifier before
 209  * destroying the RDMA ID.
 210  */
 211 void rdma_destroy_qp(struct rdma_cm_id *id);
 212
 213 /**
 214  * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
 215  *   to a specified QP state.
 216  * @id: Communication identifier associated with the QP attributes to
 217  *   initialize.
 218  * @qp_attr: On input, specifies the desired QP state.  On output, the
 219  *   mandatory and desired optional attributes will be set in order to
 220  *   modify the QP to the specified state.
 221  * @qp_attr_mask: The QP attribute mask that may be used to transition the
 222  *   QP to the specified state.
 223  *
 224  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 225  * will set all required attributes for the given transition, along with
 226  * known optional attributes.  Users may override the attributes returned from
 227  * this call before calling ib_modify_qp.
 228  *
 229  * Users that wish to have their QP automatically transitioned through its
 230  * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
 231  */
 232 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 233                        int *qp_attr_mask);
 234
 235 /**
 236  * rdma_connect - Initiate an active connection request.
 237  * @id: Connection identifier to connect.
 238  * @conn_param: Connection information used for connected QPs.
 239  *
 240  * Users must have resolved a route for the rdma_cm_id to connect with
 241  * by having called rdma_resolve_route before calling this routine.
 242  *
 243  * This call will either connect to a remote QP or obtain remote QP
 244  * information for unconnected rdma_cm_id's.  The actual operation is
 245  * based on the rdma_cm_id's port space.
 246  */
 247 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 248
 249 /**
 250  * rdma_listen - This function is called by the passive side to
 251  *   listen for incoming connection requests.
 252  *
 253  * Users must have bound the rdma_cm_id to a local address by calling
 254  * rdma_bind_addr before calling this routine.
 255  */
 256 int rdma_listen(struct rdma_cm_id *id, int backlog);
 257
 258 /**
 259  * rdma_accept - Called to accept a connection request or response.
 260  * @id: Connection identifier associated with the request.
 261  * @conn_param: Information needed to establish the connection.  This must be
 262  *   provided if accepting a connection request.  If accepting a connection
 263  *   response, this parameter must be NULL.
 264  *
 265  * Typically, this routine is only called by the listener to accept a connection
 266  * request.  It must also be called on the active side of a connection if the
 267  * user is performing their own QP transitions.
 268  *
 269  * In the case of error, a reject message is sent to the remote side and the
 270  * state of the qp associated with the id is modified to error, such that any
 271  * previously posted receive buffers would be flushed.
 272  */
 273 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 274
 275 /**
 276  * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
 277  * occurred on the connection.
 278  * @id: Connection identifier to transition to established.
 279  * @event: Asynchronous event.
 280  *
 281  * This routine should be invoked by users to notify the CM of relevant
 282  * communication events.  Events that should be reported to the CM and
 283  * when to report them are:
 284  *
 285  * IB_EVENT_COMM_EST - Used when a message is received on a connected
 286  *    QP before an RTU has been received.
 287  */
 288 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
 289
 290 /**
 291  * rdma_reject - Called to reject a connection request or response.
 292  */
 293 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
 294                 u8 private_data_len);
 295
 296 /**
 297  * rdma_disconnect - This function disconnects the associated QP and
 298  *   transitions it into the error state.
 299  */
 300 int rdma_disconnect(struct rdma_cm_id *id);
 301
 302 /**
 303  * rdma_join_multicast - Join the multicast group specified by the given
 304  *   address.
 305  * @id: Communication identifier associated with the request.
 306  * @addr: Multicast address identifying the group to join.
 307  * @context: User-defined context associated with the join request, returned
 308  * to the user through the private_data pointer in multicast events.
 309  */
 310 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
 311                         void *context);
 312
 313 /**
 314  * rdma_leave_multicast - Leave the multicast group specified by the given
 315  *   address.
 316  */
 317 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
 318
 319 /**
 320  * rdma_set_service_type - Set the type of service associated with a
 321  *   connection identifier.
 322  * @id: Communication identifier to associated with service type.
 323  * @tos: Type of service.
 324  *
 325  * The type of service is interpretted as a differentiated service
 326  * field (RFC 2474).  The service type should be specified before
 327  * performing route resolution, as existing communication on the
 328  * connection identifier may be unaffected.  The type of service
 329  * requested may not be supported by the network to all destinations.
 330  */
 331 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
 332
 333 #endif /* RDMA_CM_H */