fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / rdma / rdma_cm.h
blob010f876f41d8b559804fee1d0e3e42f7dec1a1d6
1 /*
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)
31 #define 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,
55 RDMA_CM_EVENT_MULTICAST_JOIN,
56 RDMA_CM_EVENT_MULTICAST_ERROR
59 enum rdma_port_space {
60 RDMA_PS_SDP = 0x0001,
61 RDMA_PS_IPOIB= 0x0002,
62 RDMA_PS_TCP = 0x0106,
63 RDMA_PS_UDP = 0x0111,
64 RDMA_PS_SCTP = 0x0183
67 struct 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;
77 struct rdma_route {
78 struct rdma_addr addr;
79 struct ib_sa_path_rec *path_rec;
80 int num_paths;
83 struct 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;
96 struct 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;
104 struct rdma_cm_event {
105 enum rdma_cm_event_type event;
106 int status;
107 union {
108 struct rdma_conn_param conn;
109 struct rdma_ud_param ud;
110 } param;
113 struct rdma_cm_id;
116 * rdma_cm_event_handler - Callback used to report user events.
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.
122 typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
123 struct rdma_cm_event *event);
125 struct 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;
136 * rdma_create_id - Create an RDMA identifier.
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.
143 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
144 void *context, enum rdma_port_space ps);
147 * rdma_destroy_id - Destroys an RDMA identifier.
149 * @id: RDMA identifier.
151 * Note: calling this function has the effect of canceling in-flight
152 * asynchronous operations associated with the id.
154 void rdma_destroy_id(struct rdma_cm_id *id);
157 * rdma_bind_addr - Bind an RDMA identifier to a source address and
158 * associated RDMA device, if needed.
160 * @id: RDMA identifier.
161 * @addr: Local address information. Wildcard values are permitted.
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.
167 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
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.
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.
179 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
180 struct sockaddr *dst_addr, int timeout_ms);
183 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
184 * into route information needed to establish a connection.
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.
190 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
193 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
194 * identifier.
196 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
197 * through their states.
199 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
200 struct ib_qp_init_attr *qp_init_attr);
203 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
204 * identifier.
206 * Users must destroy any QP associated with an RDMA identifier before
207 * destroying the RDMA ID.
209 void rdma_destroy_qp(struct rdma_cm_id *id);
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.
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.
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().
230 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
231 int *qp_attr_mask);
234 * rdma_connect - Initiate an active connection request.
235 * @id: Connection identifier to connect.
236 * @conn_param: Connection information used for connected QPs.
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.
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.
245 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
248 * rdma_listen - This function is called by the passive side to
249 * listen for incoming connection requests.
251 * Users must have bound the rdma_cm_id to a local address by calling
252 * rdma_bind_addr before calling this routine.
254 int rdma_listen(struct rdma_cm_id *id, int backlog);
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.
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.
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.
271 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
274 * 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.
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:
283 * IB_EVENT_COMM_EST - Used when a message is received on a connected
284 * QP before an RTU has been received.
286 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
289 * rdma_reject - Called to reject a connection request or response.
291 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
292 u8 private_data_len);
295 * rdma_disconnect - This function disconnects the associated QP and
296 * transitions it into the error state.
298 int rdma_disconnect(struct rdma_cm_id *id);
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.
308 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
309 void *context);
312 * rdma_leave_multicast - Leave the multicast group specified by the given
313 * address.
315 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
318 * rdma_set_service_type - Set the type of service associated with a
319 * connection identifier.
320 * @id: Communication identifier to associated with service type.
321 * @tos: Type of service.
323 * The type of service is interpretted as a differentiated service
324 * field (RFC 2474). The service type should be specified before
325 * performing route resolution, as existing communication on the
326 * connection identifier may be unaffected. The type of service
327 * requested may not be supported by the network to all destinations.
329 void rdma_set_service_type(struct rdma_cm_id *id, int tos);
331 #endif /* RDMA_CM_H */