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Sean Heftye51060f2006-06-17 20:37:29 -07001/*
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 */
42enum 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,
Sean Heftyc8f6a362007-02-15 17:00:18 -080055 RDMA_CM_EVENT_MULTICAST_JOIN,
56 RDMA_CM_EVENT_MULTICAST_ERROR
Sean Heftye51060f2006-06-17 20:37:29 -070057};
58
59enum rdma_port_space {
60 RDMA_PS_SDP = 0x0001,
Sean Heftyc8f6a362007-02-15 17:00:18 -080061 RDMA_PS_IPOIB= 0x0002,
Sean Heftye51060f2006-06-17 20:37:29 -070062 RDMA_PS_TCP = 0x0106,
63 RDMA_PS_UDP = 0x0111,
64 RDMA_PS_SCTP = 0x0183
65};
66
67struct rdma_addr {
68 struct sockaddr src_addr;
69 u8 src_pad[sizeof(struct sockaddr_in6) -
70 sizeof(struct sockaddr)];
71 struct sockaddr dst_addr;
72 u8 dst_pad[sizeof(struct sockaddr_in6) -
73 sizeof(struct sockaddr)];
74 struct rdma_dev_addr dev_addr;
75};
76
77struct rdma_route {
78 struct rdma_addr addr;
79 struct ib_sa_path_rec *path_rec;
80 int num_paths;
81};
82
Sean Heftya1b1b612006-11-30 16:33:14 -080083struct rdma_conn_param {
84 const void *private_data;
85 u8 private_data_len;
86 u8 responder_resources;
87 u8 initiator_depth;
88 u8 flow_control;
89 u8 retry_count; /* ignored when accepting */
90 u8 rnr_retry_count;
91 /* Fields below ignored if a QP is created on the rdma_cm_id. */
92 u8 srq;
93 u32 qp_num;
94};
95
Sean Hefty628e5f62006-11-30 16:44:16 -080096struct rdma_ud_param {
97 const void *private_data;
98 u8 private_data_len;
99 struct ib_ah_attr ah_attr;
100 u32 qp_num;
101 u32 qkey;
102};
103
Sean Heftye51060f2006-06-17 20:37:29 -0700104struct rdma_cm_event {
105 enum rdma_cm_event_type event;
106 int status;
Sean Heftya1b1b612006-11-30 16:33:14 -0800107 union {
108 struct rdma_conn_param conn;
Sean Hefty628e5f62006-11-30 16:44:16 -0800109 struct rdma_ud_param ud;
Sean Heftya1b1b612006-11-30 16:33:14 -0800110 } param;
Sean Heftye51060f2006-06-17 20:37:29 -0700111};
112
113struct rdma_cm_id;
114
115/**
116 * rdma_cm_event_handler - Callback used to report user events.
117 *
118 * Notes: Users may not call rdma_destroy_id from this callback to destroy
119 * the passed in id, or a corresponding listen id. Returning a
120 * non-zero value from the callback will destroy the passed in id.
121 */
122typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
123 struct rdma_cm_event *event);
124
125struct rdma_cm_id {
126 struct ib_device *device;
127 void *context;
128 struct ib_qp *qp;
129 rdma_cm_event_handler event_handler;
130 struct rdma_route route;
131 enum rdma_port_space ps;
132 u8 port_num;
133};
134
135/**
136 * rdma_create_id - Create an RDMA identifier.
137 *
138 * @event_handler: User callback invoked to report events associated with the
139 * returned rdma_id.
140 * @context: User specified context associated with the id.
141 * @ps: RDMA port space.
142 */
143struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
144 void *context, enum rdma_port_space ps);
145
Or Gerlitz07eeec02006-09-12 09:03:33 -0700146/**
147 * rdma_destroy_id - Destroys an RDMA identifier.
148 *
149 * @id: RDMA identifier.
150 *
151 * Note: calling this function has the effect of canceling in-flight
152 * asynchronous operations associated with the id.
153 */
Sean Heftye51060f2006-06-17 20:37:29 -0700154void rdma_destroy_id(struct rdma_cm_id *id);
155
156/**
157 * rdma_bind_addr - Bind an RDMA identifier to a source address and
158 * associated RDMA device, if needed.
159 *
160 * @id: RDMA identifier.
161 * @addr: Local address information. Wildcard values are permitted.
162 *
163 * This associates a source address with the RDMA identifier before calling
164 * rdma_listen. If a specific local address is given, the RDMA identifier will
165 * be bound to a local RDMA device.
166 */
167int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
168
169/**
170 * rdma_resolve_addr - Resolve destination and optional source addresses
171 * from IP addresses to an RDMA address. If successful, the specified
172 * rdma_cm_id will be bound to a local device.
173 *
174 * @id: RDMA identifier.
175 * @src_addr: Source address information. This parameter may be NULL.
176 * @dst_addr: Destination address information.
177 * @timeout_ms: Time to wait for resolution to complete.
178 */
179int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
180 struct sockaddr *dst_addr, int timeout_ms);
181
182/**
183 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
184 * into route information needed to establish a connection.
185 *
186 * This is called on the client side of a connection.
187 * Users must have first called rdma_resolve_addr to resolve a dst_addr
188 * into an RDMA address before calling this routine.
189 */
190int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
191
192/**
193 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
194 * identifier.
195 *
196 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
197 * through their states.
198 */
199int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
200 struct ib_qp_init_attr *qp_init_attr);
201
202/**
203 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
204 * identifier.
205 *
206 * Users must destroy any QP associated with an RDMA identifier before
207 * destroying the RDMA ID.
208 */
209void rdma_destroy_qp(struct rdma_cm_id *id);
210
211/**
212 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
213 * to a specified QP state.
214 * @id: Communication identifier associated with the QP attributes to
215 * initialize.
216 * @qp_attr: On input, specifies the desired QP state. On output, the
217 * mandatory and desired optional attributes will be set in order to
218 * modify the QP to the specified state.
219 * @qp_attr_mask: The QP attribute mask that may be used to transition the
220 * QP to the specified state.
221 *
222 * Users must set the @qp_attr->qp_state to the desired QP state. This call
223 * will set all required attributes for the given transition, along with
224 * known optional attributes. Users may override the attributes returned from
225 * this call before calling ib_modify_qp.
226 *
227 * Users that wish to have their QP automatically transitioned through its
228 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
229 */
230int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
231 int *qp_attr_mask);
232
Sean Heftye51060f2006-06-17 20:37:29 -0700233/**
234 * rdma_connect - Initiate an active connection request.
Sean Hefty628e5f62006-11-30 16:44:16 -0800235 * @id: Connection identifier to connect.
236 * @conn_param: Connection information used for connected QPs.
Sean Heftye51060f2006-06-17 20:37:29 -0700237 *
238 * Users must have resolved a route for the rdma_cm_id to connect with
239 * by having called rdma_resolve_route before calling this routine.
Sean Hefty628e5f62006-11-30 16:44:16 -0800240 *
241 * This call will either connect to a remote QP or obtain remote QP
242 * information for unconnected rdma_cm_id's. The actual operation is
243 * based on the rdma_cm_id's port space.
Sean Heftye51060f2006-06-17 20:37:29 -0700244 */
245int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
246
247/**
248 * rdma_listen - This function is called by the passive side to
249 * listen for incoming connection requests.
250 *
251 * Users must have bound the rdma_cm_id to a local address by calling
252 * rdma_bind_addr before calling this routine.
253 */
254int rdma_listen(struct rdma_cm_id *id, int backlog);
255
256/**
257 * rdma_accept - Called to accept a connection request or response.
258 * @id: Connection identifier associated with the request.
259 * @conn_param: Information needed to establish the connection. This must be
260 * provided if accepting a connection request. If accepting a connection
261 * response, this parameter must be NULL.
262 *
263 * Typically, this routine is only called by the listener to accept a connection
264 * request. It must also be called on the active side of a connection if the
265 * user is performing their own QP transitions.
Or Gerlitz951f7fc2006-09-22 15:22:54 -0700266 *
267 * In the case of error, a reject message is sent to the remote side and the
268 * state of the qp associated with the id is modified to error, such that any
269 * previously posted receive buffers would be flushed.
Sean Heftye51060f2006-06-17 20:37:29 -0700270 */
271int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
272
273/**
Sean Hefty0fe313b2006-11-30 16:37:15 -0800274 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
275 * occurred on the connection.
276 * @id: Connection identifier to transition to established.
277 * @event: Asynchronous event.
278 *
279 * This routine should be invoked by users to notify the CM of relevant
280 * communication events. Events that should be reported to the CM and
281 * when to report them are:
282 *
283 * IB_EVENT_COMM_EST - Used when a message is received on a connected
284 * QP before an RTU has been received.
285 */
286int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
287
288/**
Sean Heftye51060f2006-06-17 20:37:29 -0700289 * rdma_reject - Called to reject a connection request or response.
290 */
291int rdma_reject(struct rdma_cm_id *id, const void *private_data,
292 u8 private_data_len);
293
294/**
295 * rdma_disconnect - This function disconnects the associated QP and
296 * transitions it into the error state.
297 */
298int rdma_disconnect(struct rdma_cm_id *id);
299
Sean Heftyc8f6a362007-02-15 17:00:18 -0800300/**
301 * rdma_join_multicast - Join the multicast group specified by the given
302 * address.
303 * @id: Communication identifier associated with the request.
304 * @addr: Multicast address identifying the group to join.
305 * @context: User-defined context associated with the join request, returned
306 * to the user through the private_data pointer in multicast events.
307 */
308int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
309 void *context);
Sean Heftye51060f2006-06-17 20:37:29 -0700310
Sean Heftyc8f6a362007-02-15 17:00:18 -0800311/**
312 * rdma_leave_multicast - Leave the multicast group specified by the given
313 * address.
314 */
315void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
316
317#endif /* RDMA_CM_H */