2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
4 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
5 * Copyright (c) 2005 Intel Corporation. All rights reserved.
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 #if !defined(RDMA_CM_H)
39 #include <linux/socket.h>
40 #include <linux/in6.h>
41 #include <rdma/ib_addr.h>
42 #include <rdma/ib_sa.h>
45 * Upon receiving a device removal event, users must destroy the associated
46 * RDMA identifier and release all resources allocated with the device.
48 enum rdma_cm_event_type {
49 RDMA_CM_EVENT_ADDR_RESOLVED,
50 RDMA_CM_EVENT_ADDR_ERROR,
51 RDMA_CM_EVENT_ROUTE_RESOLVED,
52 RDMA_CM_EVENT_ROUTE_ERROR,
53 RDMA_CM_EVENT_CONNECT_REQUEST,
54 RDMA_CM_EVENT_CONNECT_RESPONSE,
55 RDMA_CM_EVENT_CONNECT_ERROR,
56 RDMA_CM_EVENT_UNREACHABLE,
57 RDMA_CM_EVENT_REJECTED,
58 RDMA_CM_EVENT_ESTABLISHED,
59 RDMA_CM_EVENT_DISCONNECTED,
60 RDMA_CM_EVENT_DEVICE_REMOVAL,
61 RDMA_CM_EVENT_MULTICAST_JOIN,
62 RDMA_CM_EVENT_MULTICAST_ERROR,
63 RDMA_CM_EVENT_ADDR_CHANGE,
64 RDMA_CM_EVENT_TIMEWAIT_EXIT
67 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event);
69 enum rdma_port_space {
71 RDMA_PS_IPOIB = 0x0002,
77 #define RDMA_IB_IP_PS_MASK 0xFFFFFFFFFFFF0000ULL
78 #define RDMA_IB_IP_PS_TCP 0x0000000001060000ULL
79 #define RDMA_IB_IP_PS_UDP 0x0000000001110000ULL
80 #define RDMA_IB_IP_PS_IB 0x00000000013F0000ULL
83 struct sockaddr_storage src_addr;
84 struct sockaddr_storage dst_addr;
85 struct rdma_dev_addr dev_addr;
89 struct rdma_addr addr;
90 struct ib_sa_path_rec *path_rec;
94 struct rdma_conn_param {
95 const void *private_data;
97 u8 responder_resources;
100 u8 retry_count; /* ignored when accepting */
102 /* Fields below ignored if a QP is created on the rdma_cm_id. */
108 struct rdma_ud_param {
109 const void *private_data;
111 struct ib_ah_attr ah_attr;
116 struct rdma_cm_event {
117 enum rdma_cm_event_type event;
120 struct rdma_conn_param conn;
121 struct rdma_ud_param ud;
128 RDMA_CM_ADDR_RESOLVED,
130 RDMA_CM_ROUTE_RESOLVED,
135 RDMA_CM_DEVICE_REMOVAL,
142 * rdma_cm_event_handler - Callback used to report user events.
144 * Notes: Users may not call rdma_destroy_id from this callback to destroy
145 * the passed in id, or a corresponding listen id. Returning a
146 * non-zero value from the callback will destroy the passed in id.
148 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
149 struct rdma_cm_event *event);
152 struct ib_device *device;
155 rdma_cm_event_handler event_handler;
156 struct rdma_route route;
157 enum rdma_port_space ps;
158 enum ib_qp_type qp_type;
163 * rdma_create_id - Create an RDMA identifier.
165 * @net: The network namespace in which to create the new id.
166 * @event_handler: User callback invoked to report events associated with the
168 * @context: User specified context associated with the id.
169 * @ps: RDMA port space.
170 * @qp_type: type of queue pair associated with the id.
172 * The id holds a reference on the network namespace until it is destroyed.
174 struct rdma_cm_id *rdma_create_id(struct vnet *net,
175 rdma_cm_event_handler event_handler,
176 void *context, enum rdma_port_space ps,
177 enum ib_qp_type qp_type);
180 * rdma_destroy_id - Destroys an RDMA identifier.
182 * @id: RDMA identifier.
184 * Note: calling this function has the effect of canceling in-flight
185 * asynchronous operations associated with the id.
187 void rdma_destroy_id(struct rdma_cm_id *id);
190 * rdma_bind_addr - Bind an RDMA identifier to a source address and
191 * associated RDMA device, if needed.
193 * @id: RDMA identifier.
194 * @addr: Local address information. Wildcard values are permitted.
196 * This associates a source address with the RDMA identifier before calling
197 * rdma_listen. If a specific local address is given, the RDMA identifier will
198 * be bound to a local RDMA device.
200 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
203 * rdma_resolve_addr - Resolve destination and optional source addresses
204 * from IP addresses to an RDMA address. If successful, the specified
205 * rdma_cm_id will be bound to a local device.
207 * @id: RDMA identifier.
208 * @src_addr: Source address information. This parameter may be NULL.
209 * @dst_addr: Destination address information.
210 * @timeout_ms: Time to wait for resolution to complete.
212 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
213 struct sockaddr *dst_addr, int timeout_ms);
216 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
217 * into route information needed to establish a connection.
219 * This is called on the client side of a connection.
220 * Users must have first called rdma_resolve_addr to resolve a dst_addr
221 * into an RDMA address before calling this routine.
223 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
226 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
229 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
230 * through their states.
232 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
233 struct ib_qp_init_attr *qp_init_attr);
236 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
239 * Users must destroy any QP associated with an RDMA identifier before
240 * destroying the RDMA ID.
242 void rdma_destroy_qp(struct rdma_cm_id *id);
245 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
246 * to a specified QP state.
247 * @id: Communication identifier associated with the QP attributes to
249 * @qp_attr: On input, specifies the desired QP state. On output, the
250 * mandatory and desired optional attributes will be set in order to
251 * modify the QP to the specified state.
252 * @qp_attr_mask: The QP attribute mask that may be used to transition the
253 * QP to the specified state.
255 * Users must set the @qp_attr->qp_state to the desired QP state. This call
256 * will set all required attributes for the given transition, along with
257 * known optional attributes. Users may override the attributes returned from
258 * this call before calling ib_modify_qp.
260 * Users that wish to have their QP automatically transitioned through its
261 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
263 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
267 * rdma_connect - Initiate an active connection request.
268 * @id: Connection identifier to connect.
269 * @conn_param: Connection information used for connected QPs.
271 * Users must have resolved a route for the rdma_cm_id to connect with
272 * by having called rdma_resolve_route before calling this routine.
274 * This call will either connect to a remote QP or obtain remote QP
275 * information for unconnected rdma_cm_id's. The actual operation is
276 * based on the rdma_cm_id's port space.
278 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
281 * rdma_listen - This function is called by the passive side to
282 * listen for incoming connection requests.
284 * Users must have bound the rdma_cm_id to a local address by calling
285 * rdma_bind_addr before calling this routine.
287 int rdma_listen(struct rdma_cm_id *id, int backlog);
290 * rdma_accept - Called to accept a connection request or response.
291 * @id: Connection identifier associated with the request.
292 * @conn_param: Information needed to establish the connection. This must be
293 * provided if accepting a connection request. If accepting a connection
294 * response, this parameter must be NULL.
296 * Typically, this routine is only called by the listener to accept a connection
297 * request. It must also be called on the active side of a connection if the
298 * user is performing their own QP transitions.
300 * In the case of error, a reject message is sent to the remote side and the
301 * state of the qp associated with the id is modified to error, such that any
302 * previously posted receive buffers would be flushed.
304 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
307 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
308 * occurred on the connection.
309 * @id: Connection identifier to transition to established.
310 * @event: Asynchronous event.
312 * This routine should be invoked by users to notify the CM of relevant
313 * communication events. Events that should be reported to the CM and
314 * when to report them are:
316 * IB_EVENT_COMM_EST - Used when a message is received on a connected
317 * QP before an RTU has been received.
319 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
322 * rdma_reject - Called to reject a connection request or response.
324 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
325 u8 private_data_len);
328 * rdma_disconnect - This function disconnects the associated QP and
329 * transitions it into the error state.
331 int rdma_disconnect(struct rdma_cm_id *id);
334 * rdma_join_multicast - Join the multicast group specified by the given
336 * @id: Communication identifier associated with the request.
337 * @addr: Multicast address identifying the group to join.
338 * @join_state: Multicast JoinState bitmap requested by port.
339 * Bitmap is based on IB_SA_MCMEMBER_REC_JOIN_STATE bits.
340 * @context: User-defined context associated with the join request, returned
341 * to the user through the private_data pointer in multicast events.
343 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
344 u8 join_state, void *context);
347 * rdma_leave_multicast - Leave the multicast group specified by the given
350 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
353 * rdma_set_service_type - Set the type of service associated with a
354 * connection identifier.
355 * @id: Communication identifier to associated with service type.
356 * @tos: Type of service.
358 * The type of service is interpretted as a differentiated service
359 * field (RFC 2474). The service type should be specified before
360 * performing route resolution, as existing communication on the
361 * connection identifier may be unaffected. The type of service
362 * requested may not be supported by the network to all destinations.
364 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
367 * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
369 * @id: Communication identifier to configure.
370 * @reuse: Value indicating if the bound address is reusable.
372 * Reuse must be set before an address is bound to the id.
374 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
377 * rdma_set_afonly - Specify that listens are restricted to the
378 * bound address family only.
379 * @id: Communication identifer to configure.
380 * @afonly: Value indicating if listens are restricted.
382 * Must be set before identifier is in the listening state.
384 int rdma_set_afonly(struct rdma_cm_id *id, int afonly);
387 * rdma_get_service_id - Return the IB service ID for a specified address.
388 * @id: Communication identifier associated with the address.
389 * @addr: Address for the service ID.
391 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr);
393 #endif /* RDMA_CM_H */