2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #if !defined(RDMA_CM_H)
37 #include <linux/socket.h>
38 #include <linux/in6.h>
39 #include <rdma/ib_addr.h>
40 #include <rdma/ib_sa.h>
43 * Upon receiving a device removal event, users must destroy the associated
44 * RDMA identifier and release all resources allocated with the device.
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
65 enum rdma_port_space {
67 RDMA_PS_IPOIB = 0x0002,
73 #define RDMA_IB_IP_PS_MASK 0xFFFFFFFFFFFF0000ULL
74 #define RDMA_IB_IP_PS_TCP 0x0000000001060000ULL
75 #define RDMA_IB_IP_PS_UDP 0x0000000001110000ULL
76 #define RDMA_IB_IP_PS_IB 0x00000000013F0000ULL
79 struct sockaddr_storage src_addr;
80 struct sockaddr_storage dst_addr;
81 struct rdma_dev_addr dev_addr;
85 struct rdma_addr addr;
86 struct ib_sa_path_rec *path_rec;
90 struct rdma_conn_param {
91 const void *private_data;
93 u8 responder_resources;
96 u8 retry_count; /* ignored when accepting */
98 /* Fields below ignored if a QP is created on the rdma_cm_id. */
103 struct rdma_ud_param {
104 const void *private_data;
106 struct ib_ah_attr ah_attr;
111 struct rdma_cm_event {
112 enum rdma_cm_event_type event;
115 struct rdma_conn_param conn;
116 struct rdma_ud_param ud;
123 RDMA_CM_ADDR_RESOLVED,
125 RDMA_CM_ROUTE_RESOLVED,
130 RDMA_CM_DEVICE_REMOVAL,
137 * rdma_cm_event_handler - Callback used to report user events.
139 * Notes: Users may not call rdma_destroy_id from this callback to destroy
140 * the passed in id, or a corresponding listen id. Returning a
141 * non-zero value from the callback will destroy the passed in id.
143 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
144 struct rdma_cm_event *event);
147 struct ib_device *device;
150 rdma_cm_event_handler event_handler;
151 struct rdma_route route;
152 enum rdma_port_space ps;
153 enum ib_qp_type qp_type;
158 * rdma_create_id - Create an RDMA identifier.
160 * @event_handler: User callback invoked to report events associated with the
162 * @context: User specified context associated with the id.
163 * @ps: RDMA port space.
164 * @qp_type: type of queue pair associated with the id.
166 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
167 void *context, enum rdma_port_space ps,
168 enum ib_qp_type qp_type);
171 * rdma_destroy_id - Destroys an RDMA identifier.
173 * @id: RDMA identifier.
175 * Note: calling this function has the effect of canceling in-flight
176 * asynchronous operations associated with the id.
178 void rdma_destroy_id(struct rdma_cm_id *id);
181 * rdma_bind_addr - Bind an RDMA identifier to a source address and
182 * associated RDMA device, if needed.
184 * @id: RDMA identifier.
185 * @addr: Local address information. Wildcard values are permitted.
187 * This associates a source address with the RDMA identifier before calling
188 * rdma_listen. If a specific local address is given, the RDMA identifier will
189 * be bound to a local RDMA device.
191 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
194 * rdma_resolve_addr - Resolve destination and optional source addresses
195 * from IP addresses to an RDMA address. If successful, the specified
196 * rdma_cm_id will be bound to a local device.
198 * @id: RDMA identifier.
199 * @src_addr: Source address information. This parameter may be NULL.
200 * @dst_addr: Destination address information.
201 * @timeout_ms: Time to wait for resolution to complete.
203 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
204 struct sockaddr *dst_addr, int timeout_ms);
207 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
208 * into route information needed to establish a connection.
210 * This is called on the client side of a connection.
211 * Users must have first called rdma_resolve_addr to resolve a dst_addr
212 * into an RDMA address before calling this routine.
214 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
217 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
220 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
221 * through their states.
223 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
224 struct ib_qp_init_attr *qp_init_attr);
227 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
230 * Users must destroy any QP associated with an RDMA identifier before
231 * destroying the RDMA ID.
233 void rdma_destroy_qp(struct rdma_cm_id *id);
236 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
237 * to a specified QP state.
238 * @id: Communication identifier associated with the QP attributes to
240 * @qp_attr: On input, specifies the desired QP state. On output, the
241 * mandatory and desired optional attributes will be set in order to
242 * modify the QP to the specified state.
243 * @qp_attr_mask: The QP attribute mask that may be used to transition the
244 * QP to the specified state.
246 * Users must set the @qp_attr->qp_state to the desired QP state. This call
247 * will set all required attributes for the given transition, along with
248 * known optional attributes. Users may override the attributes returned from
249 * this call before calling ib_modify_qp.
251 * Users that wish to have their QP automatically transitioned through its
252 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
254 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
258 * rdma_connect - Initiate an active connection request.
259 * @id: Connection identifier to connect.
260 * @conn_param: Connection information used for connected QPs.
262 * Users must have resolved a route for the rdma_cm_id to connect with
263 * by having called rdma_resolve_route before calling this routine.
265 * This call will either connect to a remote QP or obtain remote QP
266 * information for unconnected rdma_cm_id's. The actual operation is
267 * based on the rdma_cm_id's port space.
269 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
272 * rdma_listen - This function is called by the passive side to
273 * listen for incoming connection requests.
275 * Users must have bound the rdma_cm_id to a local address by calling
276 * rdma_bind_addr before calling this routine.
278 int rdma_listen(struct rdma_cm_id *id, int backlog);
281 * rdma_accept - Called to accept a connection request or response.
282 * @id: Connection identifier associated with the request.
283 * @conn_param: Information needed to establish the connection. This must be
284 * provided if accepting a connection request. If accepting a connection
285 * response, this parameter must be NULL.
287 * Typically, this routine is only called by the listener to accept a connection
288 * request. It must also be called on the active side of a connection if the
289 * user is performing their own QP transitions.
291 * In the case of error, a reject message is sent to the remote side and the
292 * state of the qp associated with the id is modified to error, such that any
293 * previously posted receive buffers would be flushed.
295 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
298 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
299 * occurred on the connection.
300 * @id: Connection identifier to transition to established.
301 * @event: Asynchronous event.
303 * This routine should be invoked by users to notify the CM of relevant
304 * communication events. Events that should be reported to the CM and
305 * when to report them are:
307 * IB_EVENT_COMM_EST - Used when a message is received on a connected
308 * QP before an RTU has been received.
310 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
313 * rdma_reject - Called to reject a connection request or response.
315 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
316 u8 private_data_len);
319 * rdma_disconnect - This function disconnects the associated QP and
320 * transitions it into the error state.
322 int rdma_disconnect(struct rdma_cm_id *id);
325 * rdma_join_multicast - Join the multicast group specified by the given
327 * @id: Communication identifier associated with the request.
328 * @addr: Multicast address identifying the group to join.
329 * @context: User-defined context associated with the join request, returned
330 * to the user through the private_data pointer in multicast events.
332 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
336 * rdma_leave_multicast - Leave the multicast group specified by the given
339 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
342 * rdma_set_service_type - Set the type of service associated with a
343 * connection identifier.
344 * @id: Communication identifier to associated with service type.
345 * @tos: Type of service.
347 * The type of service is interpretted as a differentiated service
348 * field (RFC 2474). The service type should be specified before
349 * performing route resolution, as existing communication on the
350 * connection identifier may be unaffected. The type of service
351 * requested may not be supported by the network to all destinations.
353 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
356 * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
358 * @id: Communication identifier to configure.
359 * @reuse: Value indicating if the bound address is reusable.
361 * Reuse must be set before an address is bound to the id.
363 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
366 * rdma_set_afonly - Specify that listens are restricted to the
367 * bound address family only.
368 * @id: Communication identifer to configure.
369 * @afonly: Value indicating if listens are restricted.
371 * Must be set before identifier is in the listening state.
373 int rdma_set_afonly(struct rdma_cm_id *id, int afonly);
375 #endif /* RDMA_CM_H */