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1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2/*
3 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
4 * Copyright (c) 2005 Intel Corporation. All rights reserved.
5 */
6
7#ifndef RDMA_CM_H
8#define RDMA_CM_H
9
10#include <linux/socket.h>
11#include <linux/in6.h>
12#include <rdma/ib_addr.h>
13#include <rdma/ib_sa.h>
14#include <uapi/rdma/rdma_user_cm.h>
15
16/*
17 * Upon receiving a device removal event, users must destroy the associated
18 * RDMA identifier and release all resources allocated with the device.
19 */
20enum rdma_cm_event_type {
21 RDMA_CM_EVENT_ADDR_RESOLVED,
22 RDMA_CM_EVENT_ADDR_ERROR,
23 RDMA_CM_EVENT_ROUTE_RESOLVED,
24 RDMA_CM_EVENT_ROUTE_ERROR,
25 RDMA_CM_EVENT_CONNECT_REQUEST,
26 RDMA_CM_EVENT_CONNECT_RESPONSE,
27 RDMA_CM_EVENT_CONNECT_ERROR,
28 RDMA_CM_EVENT_UNREACHABLE,
29 RDMA_CM_EVENT_REJECTED,
30 RDMA_CM_EVENT_ESTABLISHED,
31 RDMA_CM_EVENT_DISCONNECTED,
32 RDMA_CM_EVENT_DEVICE_REMOVAL,
33 RDMA_CM_EVENT_MULTICAST_JOIN,
34 RDMA_CM_EVENT_MULTICAST_ERROR,
35 RDMA_CM_EVENT_ADDR_CHANGE,
36 RDMA_CM_EVENT_TIMEWAIT_EXIT
37};
38
39const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event);
40
41#define RDMA_IB_IP_PS_MASK 0xFFFFFFFFFFFF0000ULL
42#define RDMA_IB_IP_PS_TCP 0x0000000001060000ULL
43#define RDMA_IB_IP_PS_UDP 0x0000000001110000ULL
44#define RDMA_IB_IP_PS_IB 0x00000000013F0000ULL
45
46struct rdma_addr {
47 struct sockaddr_storage src_addr;
48 struct sockaddr_storage dst_addr;
49 struct rdma_dev_addr dev_addr;
50};
51
52struct rdma_route {
53 struct rdma_addr addr;
54 struct sa_path_rec *path_rec;
55
56 /* Optional path records of primary path */
57 struct sa_path_rec *path_rec_inbound;
58 struct sa_path_rec *path_rec_outbound;
59
60 /*
61 * 0 - No primary nor alternate path is available
62 * 1 - Only primary path is available
63 * 2 - Both primary and alternate path are available
64 */
65 int num_pri_alt_paths;
66};
67
68struct rdma_conn_param {
69 const void *private_data;
70 u8 private_data_len;
71 u8 responder_resources;
72 u8 initiator_depth;
73 u8 flow_control;
74 u8 retry_count; /* ignored when accepting */
75 u8 rnr_retry_count;
76 /* Fields below ignored if a QP is created on the rdma_cm_id. */
77 u8 srq;
78 u32 qp_num;
79 u32 qkey;
80};
81
82struct rdma_ud_param {
83 const void *private_data;
84 u8 private_data_len;
85 struct rdma_ah_attr ah_attr;
86 u32 qp_num;
87 u32 qkey;
88};
89
90struct rdma_cm_event {
91 enum rdma_cm_event_type event;
92 int status;
93 union {
94 struct rdma_conn_param conn;
95 struct rdma_ud_param ud;
96 } param;
97 struct rdma_ucm_ece ece;
98};
99
100struct rdma_cm_id;
101
102/**
103 * rdma_cm_event_handler - Callback used to report user events.
104 *
105 * Notes: Users may not call rdma_destroy_id from this callback to destroy
106 * the passed in id, or a corresponding listen id. Returning a
107 * non-zero value from the callback will destroy the passed in id.
108 */
109typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
110 struct rdma_cm_event *event);
111
112struct rdma_cm_id {
113 struct ib_device *device;
114 void *context;
115 struct ib_qp *qp;
116 rdma_cm_event_handler event_handler;
117 struct rdma_route route;
118 enum rdma_ucm_port_space ps;
119 enum ib_qp_type qp_type;
120 u32 port_num;
121 struct work_struct net_work;
122};
123
124struct rdma_cm_id *
125__rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
126 void *context, enum rdma_ucm_port_space ps,
127 enum ib_qp_type qp_type, const char *caller);
128struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
129 void *context,
130 enum rdma_ucm_port_space ps,
131 enum ib_qp_type qp_type);
132
133/**
134 * rdma_create_id - Create an RDMA identifier.
135 *
136 * @net: The network namespace in which to create the new id.
137 * @event_handler: User callback invoked to report events associated with the
138 * returned rdma_id.
139 * @context: User specified context associated with the id.
140 * @ps: RDMA port space.
141 * @qp_type: type of queue pair associated with the id.
142 *
143 * Returns a new rdma_cm_id. The id holds a reference on the network
144 * namespace until it is destroyed.
145 *
146 * The event handler callback serializes on the id's mutex and is
147 * allowed to sleep.
148 */
149#define rdma_create_id(net, event_handler, context, ps, qp_type) \
150 __rdma_create_kernel_id(net, event_handler, context, ps, qp_type, \
151 KBUILD_MODNAME)
152
153/**
154 * rdma_destroy_id - Destroys an RDMA identifier.
155 *
156 * @id: RDMA identifier.
157 *
158 * Note: calling this function has the effect of canceling in-flight
159 * asynchronous operations associated with the id.
160 */
161void rdma_destroy_id(struct rdma_cm_id *id);
162
163/**
164 * rdma_bind_addr - Bind an RDMA identifier to a source address and
165 * associated RDMA device, if needed.
166 *
167 * @id: RDMA identifier.
168 * @addr: Local address information. Wildcard values are permitted.
169 *
170 * This associates a source address with the RDMA identifier before calling
171 * rdma_listen. If a specific local address is given, the RDMA identifier will
172 * be bound to a local RDMA device.
173 */
174int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
175
176/**
177 * rdma_resolve_addr - Resolve destination and optional source addresses
178 * from IP addresses to an RDMA address. If successful, the specified
179 * rdma_cm_id will be bound to a local device.
180 *
181 * @id: RDMA identifier.
182 * @src_addr: Source address information. This parameter may be NULL.
183 * @dst_addr: Destination address information.
184 * @timeout_ms: Time to wait for resolution to complete.
185 */
186int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
187 const struct sockaddr *dst_addr,
188 unsigned long timeout_ms);
189
190/**
191 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
192 * into route information needed to establish a connection.
193 *
194 * This is called on the client side of a connection.
195 * Users must have first called rdma_resolve_addr to resolve a dst_addr
196 * into an RDMA address before calling this routine.
197 */
198int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms);
199
200/**
201 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
202 * identifier.
203 *
204 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
205 * through their states.
206 */
207int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
208 struct ib_qp_init_attr *qp_init_attr);
209
210/**
211 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
212 * identifier.
213 *
214 * Users must destroy any QP associated with an RDMA identifier before
215 * destroying the RDMA ID.
216 */
217void rdma_destroy_qp(struct rdma_cm_id *id);
218
219/**
220 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
221 * to a specified QP state.
222 * @id: Communication identifier associated with the QP attributes to
223 * initialize.
224 * @qp_attr: On input, specifies the desired QP state. On output, the
225 * mandatory and desired optional attributes will be set in order to
226 * modify the QP to the specified state.
227 * @qp_attr_mask: The QP attribute mask that may be used to transition the
228 * QP to the specified state.
229 *
230 * Users must set the @qp_attr->qp_state to the desired QP state. This call
231 * will set all required attributes for the given transition, along with
232 * known optional attributes. Users may override the attributes returned from
233 * this call before calling ib_modify_qp.
234 *
235 * Users that wish to have their QP automatically transitioned through its
236 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
237 */
238int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
239 int *qp_attr_mask);
240
241int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
242int rdma_connect_locked(struct rdma_cm_id *id,
243 struct rdma_conn_param *conn_param);
244
245int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
246 struct rdma_ucm_ece *ece);
247
248/**
249 * rdma_listen - This function is called by the passive side to
250 * listen for incoming connection requests.
251 *
252 * Users must have bound the rdma_cm_id to a local address by calling
253 * rdma_bind_addr before calling this routine.
254 */
255int rdma_listen(struct rdma_cm_id *id, int backlog);
256
257int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
258
259void rdma_lock_handler(struct rdma_cm_id *id);
260void rdma_unlock_handler(struct rdma_cm_id *id);
261int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
262 struct rdma_ucm_ece *ece);
263
264/**
265 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
266 * occurred on the connection.
267 * @id: Connection identifier to transition to established.
268 * @event: Asynchronous event.
269 *
270 * This routine should be invoked by users to notify the CM of relevant
271 * communication events. Events that should be reported to the CM and
272 * when to report them are:
273 *
274 * IB_EVENT_COMM_EST - Used when a message is received on a connected
275 * QP before an RTU has been received.
276 */
277int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
278
279/**
280 * rdma_reject - Called to reject a connection request or response.
281 */
282int rdma_reject(struct rdma_cm_id *id, const void *private_data,
283 u8 private_data_len, u8 reason);
284
285/**
286 * rdma_disconnect - This function disconnects the associated QP and
287 * transitions it into the error state.
288 */
289int rdma_disconnect(struct rdma_cm_id *id);
290
291/**
292 * rdma_join_multicast - Join the multicast group specified by the given
293 * address.
294 * @id: Communication identifier associated with the request.
295 * @addr: Multicast address identifying the group to join.
296 * @join_state: Multicast JoinState bitmap requested by port.
297 * Bitmap is based on IB_SA_MCMEMBER_REC_JOIN_STATE bits.
298 * @context: User-defined context associated with the join request, returned
299 * to the user through the private_data pointer in multicast events.
300 */
301int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
302 u8 join_state, void *context);
303
304/**
305 * rdma_leave_multicast - Leave the multicast group specified by the given
306 * address.
307 */
308void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
309
310/**
311 * rdma_set_service_type - Set the type of service associated with a
312 * connection identifier.
313 * @id: Communication identifier to associated with service type.
314 * @tos: Type of service.
315 *
316 * The type of service is interpretted as a differentiated service
317 * field (RFC 2474). The service type should be specified before
318 * performing route resolution, as existing communication on the
319 * connection identifier may be unaffected. The type of service
320 * requested may not be supported by the network to all destinations.
321 */
322void rdma_set_service_type(struct rdma_cm_id *id, int tos);
323
324/**
325 * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
326 * the rdma_cm_id.
327 * @id: Communication identifier to configure.
328 * @reuse: Value indicating if the bound address is reusable.
329 *
330 * Reuse must be set before an address is bound to the id.
331 */
332int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
333
334/**
335 * rdma_set_afonly - Specify that listens are restricted to the
336 * bound address family only.
337 * @id: Communication identifer to configure.
338 * @afonly: Value indicating if listens are restricted.
339 *
340 * Must be set before identifier is in the listening state.
341 */
342int rdma_set_afonly(struct rdma_cm_id *id, int afonly);
343
344int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout);
345
346int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer);
347 /**
348 * rdma_get_service_id - Return the IB service ID for a specified address.
349 * @id: Communication identifier associated with the address.
350 * @addr: Address for the service ID.
351 */
352__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr);
353
354/**
355 * rdma_reject_msg - return a pointer to a reject message string.
356 * @id: Communication identifier that received the REJECT event.
357 * @reason: Value returned in the REJECT event status field.
358 */
359const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
360 int reason);
361/**
362 * rdma_consumer_reject_data - return the consumer reject private data and
363 * length, if any.
364 * @id: Communication identifier that received the REJECT event.
365 * @ev: RDMA CM reject event.
366 * @data_len: Pointer to the resulting length of the consumer data.
367 */
368const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
369 struct rdma_cm_event *ev, u8 *data_len);
370
371/**
372 * rdma_read_gids - Return the SGID and DGID used for establishing
373 * connection. This can be used after rdma_resolve_addr()
374 * on client side. This can be use on new connection
375 * on server side. This is applicable to IB, RoCE, iWarp.
376 * If cm_id is not bound yet to the RDMA device, it doesn't
377 * copy and SGID or DGID to the given pointers.
378 * @id: Communication identifier whose GIDs are queried.
379 * @sgid: Pointer to SGID where SGID will be returned. It is optional.
380 * @dgid: Pointer to DGID where DGID will be returned. It is optional.
381 * Note: This API should not be used by any new ULPs or new code.
382 * Instead, users interested in querying GIDs should refer to path record
383 * of the rdma_cm_id to query the GIDs.
384 * This API is provided for compatibility for existing users.
385 */
386
387void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
388 union ib_gid *dgid);
389
390struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *cm_id);
391struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res);
392
393#endif /* RDMA_CM_H */
1/*
2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 *
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:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
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.
23 *
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
31 * SOFTWARE.
32 */
33
34#if !defined(RDMA_CM_H)
35#define RDMA_CM_H
36
37#include <linux/socket.h>
38#include <linux/in6.h>
39#include <rdma/ib_addr.h>
40#include <rdma/ib_sa.h>
41
42/*
43 * Upon receiving a device removal event, users must destroy the associated
44 * RDMA identifier and release all resources allocated with the device.
45 */
46enum 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
63};
64
65enum rdma_port_space {
66 RDMA_PS_SDP = 0x0001,
67 RDMA_PS_IPOIB = 0x0002,
68 RDMA_PS_IB = 0x013F,
69 RDMA_PS_TCP = 0x0106,
70 RDMA_PS_UDP = 0x0111,
71};
72
73struct rdma_addr {
74 struct sockaddr_storage src_addr;
75 struct sockaddr_storage dst_addr;
76 struct rdma_dev_addr dev_addr;
77};
78
79struct rdma_route {
80 struct rdma_addr addr;
81 struct ib_sa_path_rec *path_rec;
82 int num_paths;
83};
84
85struct rdma_conn_param {
86 const void *private_data;
87 u8 private_data_len;
88 u8 responder_resources;
89 u8 initiator_depth;
90 u8 flow_control;
91 u8 retry_count; /* ignored when accepting */
92 u8 rnr_retry_count;
93 /* Fields below ignored if a QP is created on the rdma_cm_id. */
94 u8 srq;
95 u32 qp_num;
96};
97
98struct rdma_ud_param {
99 const void *private_data;
100 u8 private_data_len;
101 struct ib_ah_attr ah_attr;
102 u32 qp_num;
103 u32 qkey;
104};
105
106struct rdma_cm_event {
107 enum rdma_cm_event_type event;
108 int status;
109 union {
110 struct rdma_conn_param conn;
111 struct rdma_ud_param ud;
112 } param;
113};
114
115enum rdma_cm_state {
116 RDMA_CM_IDLE,
117 RDMA_CM_ADDR_QUERY,
118 RDMA_CM_ADDR_RESOLVED,
119 RDMA_CM_ROUTE_QUERY,
120 RDMA_CM_ROUTE_RESOLVED,
121 RDMA_CM_CONNECT,
122 RDMA_CM_DISCONNECT,
123 RDMA_CM_ADDR_BOUND,
124 RDMA_CM_LISTEN,
125 RDMA_CM_DEVICE_REMOVAL,
126 RDMA_CM_DESTROYING
127};
128
129struct rdma_cm_id;
130
131/**
132 * rdma_cm_event_handler - Callback used to report user events.
133 *
134 * Notes: Users may not call rdma_destroy_id from this callback to destroy
135 * the passed in id, or a corresponding listen id. Returning a
136 * non-zero value from the callback will destroy the passed in id.
137 */
138typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
139 struct rdma_cm_event *event);
140
141struct rdma_cm_id {
142 struct ib_device *device;
143 void *context;
144 struct ib_qp *qp;
145 rdma_cm_event_handler event_handler;
146 struct rdma_route route;
147 enum rdma_port_space ps;
148 enum ib_qp_type qp_type;
149 u8 port_num;
150};
151
152/**
153 * rdma_create_id - Create an RDMA identifier.
154 *
155 * @event_handler: User callback invoked to report events associated with the
156 * returned rdma_id.
157 * @context: User specified context associated with the id.
158 * @ps: RDMA port space.
159 * @qp_type: type of queue pair associated with the id.
160 */
161struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
162 void *context, enum rdma_port_space ps,
163 enum ib_qp_type qp_type);
164
165/**
166 * rdma_destroy_id - Destroys an RDMA identifier.
167 *
168 * @id: RDMA identifier.
169 *
170 * Note: calling this function has the effect of canceling in-flight
171 * asynchronous operations associated with the id.
172 */
173void rdma_destroy_id(struct rdma_cm_id *id);
174
175/**
176 * rdma_bind_addr - Bind an RDMA identifier to a source address and
177 * associated RDMA device, if needed.
178 *
179 * @id: RDMA identifier.
180 * @addr: Local address information. Wildcard values are permitted.
181 *
182 * This associates a source address with the RDMA identifier before calling
183 * rdma_listen. If a specific local address is given, the RDMA identifier will
184 * be bound to a local RDMA device.
185 */
186int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);
187
188/**
189 * rdma_resolve_addr - Resolve destination and optional source addresses
190 * from IP addresses to an RDMA address. If successful, the specified
191 * rdma_cm_id will be bound to a local device.
192 *
193 * @id: RDMA identifier.
194 * @src_addr: Source address information. This parameter may be NULL.
195 * @dst_addr: Destination address information.
196 * @timeout_ms: Time to wait for resolution to complete.
197 */
198int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
199 struct sockaddr *dst_addr, int timeout_ms);
200
201/**
202 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
203 * into route information needed to establish a connection.
204 *
205 * This is called on the client side of a connection.
206 * Users must have first called rdma_resolve_addr to resolve a dst_addr
207 * into an RDMA address before calling this routine.
208 */
209int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms);
210
211/**
212 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
213 * identifier.
214 *
215 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
216 * through their states.
217 */
218int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
219 struct ib_qp_init_attr *qp_init_attr);
220
221/**
222 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
223 * identifier.
224 *
225 * Users must destroy any QP associated with an RDMA identifier before
226 * destroying the RDMA ID.
227 */
228void rdma_destroy_qp(struct rdma_cm_id *id);
229
230/**
231 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
232 * to a specified QP state.
233 * @id: Communication identifier associated with the QP attributes to
234 * initialize.
235 * @qp_attr: On input, specifies the desired QP state. On output, the
236 * mandatory and desired optional attributes will be set in order to
237 * modify the QP to the specified state.
238 * @qp_attr_mask: The QP attribute mask that may be used to transition the
239 * QP to the specified state.
240 *
241 * Users must set the @qp_attr->qp_state to the desired QP state. This call
242 * will set all required attributes for the given transition, along with
243 * known optional attributes. Users may override the attributes returned from
244 * this call before calling ib_modify_qp.
245 *
246 * Users that wish to have their QP automatically transitioned through its
247 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
248 */
249int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
250 int *qp_attr_mask);
251
252/**
253 * rdma_connect - Initiate an active connection request.
254 * @id: Connection identifier to connect.
255 * @conn_param: Connection information used for connected QPs.
256 *
257 * Users must have resolved a route for the rdma_cm_id to connect with
258 * by having called rdma_resolve_route before calling this routine.
259 *
260 * This call will either connect to a remote QP or obtain remote QP
261 * information for unconnected rdma_cm_id's. The actual operation is
262 * based on the rdma_cm_id's port space.
263 */
264int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
265
266/**
267 * rdma_listen - This function is called by the passive side to
268 * listen for incoming connection requests.
269 *
270 * Users must have bound the rdma_cm_id to a local address by calling
271 * rdma_bind_addr before calling this routine.
272 */
273int rdma_listen(struct rdma_cm_id *id, int backlog);
274
275/**
276 * rdma_accept - Called to accept a connection request or response.
277 * @id: Connection identifier associated with the request.
278 * @conn_param: Information needed to establish the connection. This must be
279 * provided if accepting a connection request. If accepting a connection
280 * response, this parameter must be NULL.
281 *
282 * Typically, this routine is only called by the listener to accept a connection
283 * request. It must also be called on the active side of a connection if the
284 * user is performing their own QP transitions.
285 *
286 * In the case of error, a reject message is sent to the remote side and the
287 * state of the qp associated with the id is modified to error, such that any
288 * previously posted receive buffers would be flushed.
289 */
290int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);
291
292/**
293 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
294 * occurred on the connection.
295 * @id: Connection identifier to transition to established.
296 * @event: Asynchronous event.
297 *
298 * This routine should be invoked by users to notify the CM of relevant
299 * communication events. Events that should be reported to the CM and
300 * when to report them are:
301 *
302 * IB_EVENT_COMM_EST - Used when a message is received on a connected
303 * QP before an RTU has been received.
304 */
305int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
306
307/**
308 * rdma_reject - Called to reject a connection request or response.
309 */
310int rdma_reject(struct rdma_cm_id *id, const void *private_data,
311 u8 private_data_len);
312
313/**
314 * rdma_disconnect - This function disconnects the associated QP and
315 * transitions it into the error state.
316 */
317int rdma_disconnect(struct rdma_cm_id *id);
318
319/**
320 * rdma_join_multicast - Join the multicast group specified by the given
321 * address.
322 * @id: Communication identifier associated with the request.
323 * @addr: Multicast address identifying the group to join.
324 * @context: User-defined context associated with the join request, returned
325 * to the user through the private_data pointer in multicast events.
326 */
327int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
328 void *context);
329
330/**
331 * rdma_leave_multicast - Leave the multicast group specified by the given
332 * address.
333 */
334void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
335
336/**
337 * rdma_set_service_type - Set the type of service associated with a
338 * connection identifier.
339 * @id: Communication identifier to associated with service type.
340 * @tos: Type of service.
341 *
342 * The type of service is interpretted as a differentiated service
343 * field (RFC 2474). The service type should be specified before
344 * performing route resolution, as existing communication on the
345 * connection identifier may be unaffected. The type of service
346 * requested may not be supported by the network to all destinations.
347 */
348void rdma_set_service_type(struct rdma_cm_id *id, int tos);
349
350/**
351 * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
352 * the rdma_cm_id.
353 * @id: Communication identifier to configure.
354 * @reuse: Value indicating if the bound address is reusable.
355 *
356 * Reuse must be set before an address is bound to the id.
357 */
358int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
359
360#endif /* RDMA_CM_H */