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 licensed under one of the following licenses:
   6  *
   7  * 1) under the terms of the "Common Public License 1.0" a copy of which is
   8  *    available from the Open Source Initiative, see
   9  *    http://www.opensource.org/licenses/cpl.php.
  10  *
  11  * 2) under the terms of the "The BSD License" a copy of which is
  12  *    available from the Open Source Initiative, see
  13  *    http://www.opensource.org/licenses/bsd-license.php.
  14  *
  15  * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
  16  *    copy of which is available from the Open Source Initiative, see
  17  *    http://www.opensource.org/licenses/gpl-license.php.
  18  *
  19  * Licensee has the right to choose one of the above licenses.
  20  *
  21  * Redistributions of source code must retain the above copyright
  22  * notice and one of the license notices.
  23  *
  24  * Redistributions in binary form must reproduce both the above copyright
  25  * notice, one of the license notices in the documentation
  26  * and/or other materials provided with the distribution.
  27  *
  28  */
  29
  30 #if !defined(RDMA_CM_H)
  31 #define RDMA_CM_H
  32
  33 #include <linux/socket.h>
  34 #include <linux/in6.h>
  35 #include <rdma/ib_addr.h>
  36 #include <rdma/ib_sa.h>
  37
  38 /*
  39  * Upon receiving a device removal event, users must destroy the associated
  40  * RDMA identifier and release all resources allocated with the device.
  41  */
  42 enum rdma_cm_event_type {
  43         RDMA_CM_EVENT_ADDR_RESOLVED,
  44         RDMA_CM_EVENT_ADDR_ERROR,
  45         RDMA_CM_EVENT_ROUTE_RESOLVED,
  46         RDMA_CM_EVENT_ROUTE_ERROR,
  47         RDMA_CM_EVENT_CONNECT_REQUEST,
  48         RDMA_CM_EVENT_CONNECT_RESPONSE,
  49         RDMA_CM_EVENT_CONNECT_ERROR,
  50         RDMA_CM_EVENT_UNREACHABLE,
  51         RDMA_CM_EVENT_REJECTED,
  52         RDMA_CM_EVENT_ESTABLISHED,
  53         RDMA_CM_EVENT_DISCONNECTED,
  54         RDMA_CM_EVENT_DEVICE_REMOVAL,
  55 };
  56
  57 enum rdma_port_space {
  58         RDMA_PS_SDP  = 0x0001,
  59         RDMA_PS_TCP  = 0x0106,
  60         RDMA_PS_UDP  = 0x0111,
  61         RDMA_PS_SCTP = 0x0183
  62 };
  63
  64 struct rdma_addr {
  65         struct sockaddr src_addr;
  66         u8              src_pad[sizeof(struct sockaddr_in6) -
  67                                 sizeof(struct sockaddr)];
  68         struct sockaddr dst_addr;
  69         u8              dst_pad[sizeof(struct sockaddr_in6) -
  70                                 sizeof(struct sockaddr)];
  71         struct rdma_dev_addr dev_addr;
  72 };
  73
  74 struct rdma_route {
  75         struct rdma_addr addr;
  76         struct ib_sa_path_rec *path_rec;
  77         int num_paths;
  78 };
  79
  80 struct rdma_cm_event {
  81         enum rdma_cm_event_type  event;
  82         int                      status;
  83         void                    *private_data;
  84         u8                       private_data_len;
  85 };
  86
  87 struct rdma_cm_id;
  88
  89 /**
  90  * rdma_cm_event_handler - Callback used to report user events.
  91  *
  92  * Notes: Users may not call rdma_destroy_id from this callback to destroy
  93  *   the passed in id, or a corresponding listen id.  Returning a
  94  *   non-zero value from the callback will destroy the passed in id.
  95  */
  96 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
  97                                      struct rdma_cm_event *event);
  98
  99 struct rdma_cm_id {
 100         struct ib_device        *device;
 101         void                    *context;
 102         struct ib_qp            *qp;
 103         rdma_cm_event_handler    event_handler;
 104         struct rdma_route        route;
 105         enum rdma_port_space     ps;
 106         u8                       port_num;
 107 };
 108
 109 /**
 110  * rdma_create_id - Create an RDMA identifier.
 111  *
 112  * @event_handler: User callback invoked to report events associated with the
 113  *   returned rdma_id.
 114  * @context: User specified context associated with the id.
 115  * @ps: RDMA port space.
 116  */
 117 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 118                                   void *context, enum rdma_port_space ps);
 119
 120 /**
 121   * rdma_destroy_id - Destroys an RDMA identifier.
 122   *
 123   * @id: RDMA identifier.
 124   *
 125   * Note: calling this function has the effect of canceling in-flight
 126   * asynchronous operations associated with the id.
 127   */
 128 void rdma_destroy_id(struct rdma_cm_id *id);
 129
 130 /**
 131  * rdma_bind_addr - Bind an RDMA identifier to a source address and
 132  *   associated RDMA device, if needed.
 133  *
 134  * @id: RDMA identifier.
 135  * @addr: Local address information.  Wildcard values are permitted.
 136  *
 137  * This associates a source address with the RDMA identifier before calling
 138  * rdma_listen.  If a specific local address is given, the RDMA identifier will
 139  * be bound to a local RDMA device.
 140  */
 141 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
 142
 143 /**
 144  * rdma_resolve_addr - Resolve destination and optional source addresses
 145  *   from IP addresses to an RDMA address.  If successful, the specified
 146  *   rdma_cm_id will be bound to a local device.
 147  *
 148  * @id: RDMA identifier.
 149  * @src_addr: Source address information.  This parameter may be NULL.
 150  * @dst_addr: Destination address information.
 151  * @timeout_ms: Time to wait for resolution to complete.
 152  */
 153 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
 154                       struct sockaddr *dst_addr, int timeout_ms);
 155
 156 /**
 157  * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
 158  *   into route information needed to establish a connection.
 159  *
 160  * This is called on the client side of a connection.
 161  * Users must have first called rdma_resolve_addr to resolve a dst_addr
 162  * into an RDMA address before calling this routine.
 163  */
 164 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
 165
 166 /**
 167  * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
 168  * identifier.
 169  *
 170  * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
 171  * through their states.
 172  */
 173 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 174                    struct ib_qp_init_attr *qp_init_attr);
 175
 176 /**
 177  * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
 178  * identifier.
 179  *
 180  * Users must destroy any QP associated with an RDMA identifier before
 181  * destroying the RDMA ID.
 182  */
 183 void rdma_destroy_qp(struct rdma_cm_id *id);
 184
 185 /**
 186  * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
 187  *   to a specified QP state.
 188  * @id: Communication identifier associated with the QP attributes to
 189  *   initialize.
 190  * @qp_attr: On input, specifies the desired QP state.  On output, the
 191  *   mandatory and desired optional attributes will be set in order to
 192  *   modify the QP to the specified state.
 193  * @qp_attr_mask: The QP attribute mask that may be used to transition the
 194  *   QP to the specified state.
 195  *
 196  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 197  * will set all required attributes for the given transition, along with
 198  * known optional attributes.  Users may override the attributes returned from
 199  * this call before calling ib_modify_qp.
 200  *
 201  * Users that wish to have their QP automatically transitioned through its
 202  * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
 203  */
 204 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 205                        int *qp_attr_mask);
 206
 207 struct rdma_conn_param {
 208         const void *private_data;
 209         u8 private_data_len;
 210         u8 responder_resources;
 211         u8 initiator_depth;
 212         u8 flow_control;
 213         u8 retry_count;         /* ignored when accepting */
 214         u8 rnr_retry_count;
 215         /* Fields below ignored if a QP is created on the rdma_cm_id. */
 216         u8 srq;
 217         u32 qp_num;
 218         enum ib_qp_type qp_type;
 219 };
 220
 221 /**
 222  * rdma_connect - Initiate an active connection request.
 223  *
 224  * Users must have resolved a route for the rdma_cm_id to connect with
 225  * by having called rdma_resolve_route before calling this routine.
 226  */
 227 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 228
 229 /**
 230  * rdma_listen - This function is called by the passive side to
 231  *   listen for incoming connection requests.
 232  *
 233  * Users must have bound the rdma_cm_id to a local address by calling
 234  * rdma_bind_addr before calling this routine.
 235  */
 236 int rdma_listen(struct rdma_cm_id *id, int backlog);
 237
 238 /**
 239  * rdma_accept - Called to accept a connection request or response.
 240  * @id: Connection identifier associated with the request.
 241  * @conn_param: Information needed to establish the connection.  This must be
 242  *   provided if accepting a connection request.  If accepting a connection
 243  *   response, this parameter must be NULL.
 244  *
 245  * Typically, this routine is only called by the listener to accept a connection
 246  * request.  It must also be called on the active side of a connection if the
 247  * user is performing their own QP transitions.
 248  *
 249  * In the case of error, a reject message is sent to the remote side and the
 250  * state of the qp associated with the id is modified to error, such that any
 251  * previously posted receive buffers would be flushed.
 252  */
 253 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 254
 255 /**
 256  * rdma_reject - Called to reject a connection request or response.
 257  */
 258 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
 259                 u8 private_data_len);
 260
 261 /**
 262  * rdma_disconnect - This function disconnects the associated QP and
 263  *   transitions it into the error state.
 264  */
 265 int rdma_disconnect(struct rdma_cm_id *id);
 266
 267 #endif /* RDMA_CM_H */
 268