2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
5 * This Software is licensed under one of the following licenses:
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.
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.
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.
19 * Licensee has the right to choose one of the above licenses.
21 * Redistributions of source code must retain the above copyright
22 * notice and one of the license notices.
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.
30 #if !defined(RDMA_CM_H)
33 #include <linux/socket.h>
34 #include <linux/in6.h>
35 #include <rdma/ib_addr.h>
36 #include <rdma/ib_sa.h>
39 * Upon receiving a device removal event, users must destroy the associated
40 * RDMA identifier and release all resources allocated with the device.
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,
57 enum rdma_port_space {
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;
75 struct rdma_addr addr;
76 struct ib_sa_path_rec *path_rec;
80 struct rdma_cm_event {
81 enum rdma_cm_event_type event;
90 * rdma_cm_event_handler - Callback used to report user events.
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.
96 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
97 struct rdma_cm_event *event);
100 struct ib_device *device;
103 rdma_cm_event_handler event_handler;
104 struct rdma_route route;
105 enum rdma_port_space ps;
110 * rdma_create_id - Create an RDMA identifier.
112 * @event_handler: User callback invoked to report events associated with the
114 * @context: User specified context associated with the id.
115 * @ps: RDMA port space.
117 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
118 void *context, enum rdma_port_space ps);
121 * rdma_destroy_id - Destroys an RDMA identifier.
123 * @id: RDMA identifier.
125 * Note: calling this function has the effect of canceling in-flight
126 * asynchronous operations associated with the id.
128 void rdma_destroy_id(struct rdma_cm_id *id);
131 * rdma_bind_addr - Bind an RDMA identifier to a source address and
132 * associated RDMA device, if needed.
134 * @id: RDMA identifier.
135 * @addr: Local address information. Wildcard values are permitted.
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.
141 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
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.
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.
153 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
154 struct sockaddr *dst_addr, int timeout_ms);
157 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
158 * into route information needed to establish a connection.
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.
164 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
167 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
170 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
171 * through their states.
173 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
174 struct ib_qp_init_attr *qp_init_attr);
177 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
180 * Users must destroy any QP associated with an RDMA identifier before
181 * destroying the RDMA ID.
183 void rdma_destroy_qp(struct rdma_cm_id *id);
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
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.
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.
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().
204 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
207 struct rdma_conn_param {
208 const void *private_data;
210 u8 responder_resources;
213 u8 retry_count; /* ignored when accepting */
215 /* Fields below ignored if a QP is created on the rdma_cm_id. */
218 enum ib_qp_type qp_type;
222 * rdma_connect - Initiate an active connection request.
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.
227 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
230 * rdma_listen - This function is called by the passive side to
231 * listen for incoming connection requests.
233 * Users must have bound the rdma_cm_id to a local address by calling
234 * rdma_bind_addr before calling this routine.
236 int rdma_listen(struct rdma_cm_id *id, int backlog);
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.
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.
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.
253 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
256 * rdma_reject - Called to reject a connection request or response.
258 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
259 u8 private_data_len);
262 * rdma_disconnect - This function disconnects the associated QP and
263 * transitions it into the error state.
265 int rdma_disconnect(struct rdma_cm_id *id);
267 #endif /* RDMA_CM_H */