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 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event);
  66
  67 enum rdma_port_space {
  68         RDMA_PS_SDP   = 0x0001,
  69         RDMA_PS_IPOIB = 0x0002,
  70         RDMA_PS_IB    = 0x013F,
  71         RDMA_PS_TCP   = 0x0106,
  72         RDMA_PS_UDP   = 0x0111,
  73 };
  74
  75 #define RDMA_IB_IP_PS_MASK   0xFFFFFFFFFFFF0000ULL
  76 #define RDMA_IB_IP_PS_TCP    0x0000000001060000ULL
  77 #define RDMA_IB_IP_PS_UDP    0x0000000001110000ULL
  78 #define RDMA_IB_IP_PS_IB     0x00000000013F0000ULL
  79
  80 struct rdma_addr {
  81         struct sockaddr_storage src_addr;
  82         struct sockaddr_storage dst_addr;
  83         struct rdma_dev_addr dev_addr;
  84 };
  85
  86 struct rdma_route {
  87         struct rdma_addr addr;
  88         struct sa_path_rec *path_rec;
  89         int num_paths;
  90 };
  91
  92 struct rdma_conn_param {
  93         const void *private_data;
  94         u8 private_data_len;
  95         u8 responder_resources;
  96         u8 initiator_depth;
  97         u8 flow_control;
  98         u8 retry_count;         /* ignored when accepting */
  99         u8 rnr_retry_count;
 100         /* Fields below ignored if a QP is created on the rdma_cm_id. */
 101         u8 srq;
 102         u32 qp_num;
 103         u32 qkey;
 104 };
 105
 106 struct rdma_ud_param {
 107         const void *private_data;
 108         u8 private_data_len;
 109         struct rdma_ah_attr ah_attr;
 110         u32 qp_num;
 111         u32 qkey;
 112 };
 113
 114 struct rdma_cm_event {
 115         enum rdma_cm_event_type  event;
 116         int                      status;
 117         union {
 118                 struct rdma_conn_param  conn;
 119                 struct rdma_ud_param    ud;
 120         } param;
 121 };
 122
 123 enum rdma_cm_state {
 124         RDMA_CM_IDLE,
 125         RDMA_CM_ADDR_QUERY,
 126         RDMA_CM_ADDR_RESOLVED,
 127         RDMA_CM_ROUTE_QUERY,
 128         RDMA_CM_ROUTE_RESOLVED,
 129         RDMA_CM_CONNECT,
 130         RDMA_CM_DISCONNECT,
 131         RDMA_CM_ADDR_BOUND,
 132         RDMA_CM_LISTEN,
 133         RDMA_CM_DEVICE_REMOVAL,
 134         RDMA_CM_DESTROYING
 135 };
 136
 137 struct rdma_cm_id;
 138
 139 /**
 140  * rdma_cm_event_handler - Callback used to report user events.
 141  *
 142  * Notes: Users may not call rdma_destroy_id from this callback to destroy
 143  *   the passed in id, or a corresponding listen id.  Returning a
 144  *   non-zero value from the callback will destroy the passed in id.
 145  */
 146 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
 147                                      struct rdma_cm_event *event);
 148
 149 struct rdma_cm_id {
 150         struct ib_device        *device;
 151         void                    *context;
 152         struct ib_qp            *qp;
 153         rdma_cm_event_handler    event_handler;
 154         struct rdma_route        route;
 155         enum rdma_port_space     ps;
 156         enum ib_qp_type          qp_type;
 157         u8                       port_num;
 158 };
 159
 160 /**
 161  * rdma_create_id - Create an RDMA identifier.
 162  *
 163  * @net: The network namespace in which to create the new id.
 164  * @event_handler: User callback invoked to report events associated with the
 165  *   returned rdma_id.
 166  * @context: User specified context associated with the id.
 167  * @ps: RDMA port space.
 168  * @qp_type: type of queue pair associated with the id.
 169  *
 170  * The id holds a reference on the network namespace until it is destroyed.
 171  */
 172 struct rdma_cm_id *rdma_create_id(struct net *net,
 173                                   rdma_cm_event_handler event_handler,
 174                                   void *context, enum rdma_port_space ps,
 175                                   enum ib_qp_type qp_type);
 176
 177 /**
 178   * rdma_destroy_id - Destroys an RDMA identifier.
 179   *
 180   * @id: RDMA identifier.
 181   *
 182   * Note: calling this function has the effect of canceling in-flight
 183   * asynchronous operations associated with the id.
 184   */
 185 void rdma_destroy_id(struct rdma_cm_id *id);
 186
 187 /**
 188  * rdma_bind_addr - Bind an RDMA identifier to a source address and
 189  *   associated RDMA device, if needed.
 190  *
 191  * @id: RDMA identifier.
 192  * @addr: Local address information.  Wildcard values are permitted.
 193  *
 194  * This associates a source address with the RDMA identifier before calling
 195  * rdma_listen.  If a specific local address is given, the RDMA identifier will
 196  * be bound to a local RDMA device.
 197  */
 198 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
 199
 200 /**
 201  * rdma_resolve_addr - Resolve destination and optional source addresses
 202  *   from IP addresses to an RDMA address.  If successful, the specified
 203  *   rdma_cm_id will be bound to a local device.
 204  *
 205  * @id: RDMA identifier.
 206  * @src_addr: Source address information.  This parameter may be NULL.
 207  * @dst_addr: Destination address information.
 208  * @timeout_ms: Time to wait for resolution to complete.
 209  */
 210 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
 211                       struct sockaddr *dst_addr, int timeout_ms);
 212
 213 /**
 214  * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
 215  *   into route information needed to establish a connection.
 216  *
 217  * This is called on the client side of a connection.
 218  * Users must have first called rdma_resolve_addr to resolve a dst_addr
 219  * into an RDMA address before calling this routine.
 220  */
 221 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
 222
 223 /**
 224  * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
 225  * identifier.
 226  *
 227  * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
 228  * through their states.
 229  */
 230 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 231                    struct ib_qp_init_attr *qp_init_attr);
 232
 233 /**
 234  * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
 235  * identifier.
 236  *
 237  * Users must destroy any QP associated with an RDMA identifier before
 238  * destroying the RDMA ID.
 239  */
 240 void rdma_destroy_qp(struct rdma_cm_id *id);
 241
 242 /**
 243  * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
 244  *   to a specified QP state.
 245  * @id: Communication identifier associated with the QP attributes to
 246  *   initialize.
 247  * @qp_attr: On input, specifies the desired QP state.  On output, the
 248  *   mandatory and desired optional attributes will be set in order to
 249  *   modify the QP to the specified state.
 250  * @qp_attr_mask: The QP attribute mask that may be used to transition the
 251  *   QP to the specified state.
 252  *
 253  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 254  * will set all required attributes for the given transition, along with
 255  * known optional attributes.  Users may override the attributes returned from
 256  * this call before calling ib_modify_qp.
 257  *
 258  * Users that wish to have their QP automatically transitioned through its
 259  * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
 260  */
 261 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 262                        int *qp_attr_mask);
 263
 264 /**
 265  * rdma_connect - Initiate an active connection request.
 266  * @id: Connection identifier to connect.
 267  * @conn_param: Connection information used for connected QPs.
 268  *
 269  * Users must have resolved a route for the rdma_cm_id to connect with
 270  * by having called rdma_resolve_route before calling this routine.
 271  *
 272  * This call will either connect to a remote QP or obtain remote QP
 273  * information for unconnected rdma_cm_id's.  The actual operation is
 274  * based on the rdma_cm_id's port space.
 275  */
 276 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 277
 278 /**
 279  * rdma_listen - This function is called by the passive side to
 280  *   listen for incoming connection requests.
 281  *
 282  * Users must have bound the rdma_cm_id to a local address by calling
 283  * rdma_bind_addr before calling this routine.
 284  */
 285 int rdma_listen(struct rdma_cm_id *id, int backlog);
 286
 287 /**
 288  * rdma_accept - Called to accept a connection request or response.
 289  * @id: Connection identifier associated with the request.
 290  * @conn_param: Information needed to establish the connection.  This must be
 291  *   provided if accepting a connection request.  If accepting a connection
 292  *   response, this parameter must be NULL.
 293  *
 294  * Typically, this routine is only called by the listener to accept a connection
 295  * request.  It must also be called on the active side of a connection if the
 296  * user is performing their own QP transitions.
 297  *
 298  * In the case of error, a reject message is sent to the remote side and the
 299  * state of the qp associated with the id is modified to error, such that any
 300  * previously posted receive buffers would be flushed.
 301  */
 302 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
 303
 304 /**
 305  * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
 306  * occurred on the connection.
 307  * @id: Connection identifier to transition to established.
 308  * @event: Asynchronous event.
 309  *
 310  * This routine should be invoked by users to notify the CM of relevant
 311  * communication events.  Events that should be reported to the CM and
 312  * when to report them are:
 313  *
 314  * IB_EVENT_COMM_EST - Used when a message is received on a connected
 315  *    QP before an RTU has been received.
 316  */
 317 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
 318
 319 /**
 320  * rdma_reject - Called to reject a connection request or response.
 321  */
 322 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
 323                 u8 private_data_len);
 324
 325 /**
 326  * rdma_disconnect - This function disconnects the associated QP and
 327  *   transitions it into the error state.
 328  */
 329 int rdma_disconnect(struct rdma_cm_id *id);
 330
 331 /**
 332  * rdma_join_multicast - Join the multicast group specified by the given
 333  *   address.
 334  * @id: Communication identifier associated with the request.
 335  * @addr: Multicast address identifying the group to join.
 336  * @join_state: Multicast JoinState bitmap requested by port.
 337  *              Bitmap is based on IB_SA_MCMEMBER_REC_JOIN_STATE bits.
 338  * @context: User-defined context associated with the join request, returned
 339  * to the user through the private_data pointer in multicast events.
 340  */
 341 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
 342                         u8 join_state, void *context);
 343
 344 /**
 345  * rdma_leave_multicast - Leave the multicast group specified by the given
 346  *   address.
 347  */
 348 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
 349
 350 /**
 351  * rdma_set_service_type - Set the type of service associated with a
 352  *   connection identifier.
 353  * @id: Communication identifier to associated with service type.
 354  * @tos: Type of service.
 355  *
 356  * The type of service is interpretted as a differentiated service
 357  * field (RFC 2474).  The service type should be specified before
 358  * performing route resolution, as existing communication on the
 359  * connection identifier may be unaffected.  The type of service
 360  * requested may not be supported by the network to all destinations.
 361  */
 362 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
 363
 364 /**
 365  * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
 366  *    the rdma_cm_id.
 367  * @id: Communication identifier to configure.
 368  * @reuse: Value indicating if the bound address is reusable.
 369  *
 370  * Reuse must be set before an address is bound to the id.
 371  */
 372 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
 373
 374 /**
 375  * rdma_set_afonly - Specify that listens are restricted to the
 376  *    bound address family only.
 377  * @id: Communication identifer to configure.
 378  * @afonly: Value indicating if listens are restricted.
 379  *
 380  * Must be set before identifier is in the listening state.
 381  */
 382 int rdma_set_afonly(struct rdma_cm_id *id, int afonly);
 383
 384  /**
 385  * rdma_get_service_id - Return the IB service ID for a specified address.
 386  * @id: Communication identifier associated with the address.
 387  * @addr: Address for the service ID.
 388  */
 389 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr);
 390
 391 /**
 392  * rdma_reject_msg - return a pointer to a reject message string.
 393  * @id: Communication identifier that received the REJECT event.
 394  * @reason: Value returned in the REJECT event status field.
 395  */
 396 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
 397                                                 int reason);
 398 /**
 399  * rdma_is_consumer_reject - return true if the consumer rejected the connect
 400  *                           request.
 401  * @id: Communication identifier that received the REJECT event.
 402  * @reason: Value returned in the REJECT event status field.
 403  */
 404 bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason);
 405
 406 /**
 407  * rdma_consumer_reject_data - return the consumer reject private data and
 408  *                             length, if any.
 409  * @id: Communication identifier that received the REJECT event.
 410  * @ev: RDMA CM reject event.
 411  * @data_len: Pointer to the resulting length of the consumer data.
 412  */
 413 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
 414                                       struct rdma_cm_event *ev, u8 *data_len);
 415
 416 #endif /* RDMA_CM_H */