Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 71f48cfdc24cde951e35565c9198d744ed5f9483 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2005 Intel Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#if !defined(RDMA_CM_H)
#define RDMA_CM_H

#include <linux/socket.h>
#include <linux/in6.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_sa.h>
#include <uapi/rdma/rdma_user_cm.h>

/*
 * Upon receiving a device removal event, users must destroy the associated
 * RDMA identifier and release all resources allocated with the device.
 */
enum rdma_cm_event_type {
	RDMA_CM_EVENT_ADDR_RESOLVED,
	RDMA_CM_EVENT_ADDR_ERROR,
	RDMA_CM_EVENT_ROUTE_RESOLVED,
	RDMA_CM_EVENT_ROUTE_ERROR,
	RDMA_CM_EVENT_CONNECT_REQUEST,
	RDMA_CM_EVENT_CONNECT_RESPONSE,
	RDMA_CM_EVENT_CONNECT_ERROR,
	RDMA_CM_EVENT_UNREACHABLE,
	RDMA_CM_EVENT_REJECTED,
	RDMA_CM_EVENT_ESTABLISHED,
	RDMA_CM_EVENT_DISCONNECTED,
	RDMA_CM_EVENT_DEVICE_REMOVAL,
	RDMA_CM_EVENT_MULTICAST_JOIN,
	RDMA_CM_EVENT_MULTICAST_ERROR,
	RDMA_CM_EVENT_ADDR_CHANGE,
	RDMA_CM_EVENT_TIMEWAIT_EXIT
};

const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event);

#define RDMA_IB_IP_PS_MASK   0xFFFFFFFFFFFF0000ULL
#define RDMA_IB_IP_PS_TCP    0x0000000001060000ULL
#define RDMA_IB_IP_PS_UDP    0x0000000001110000ULL
#define RDMA_IB_IP_PS_IB     0x00000000013F0000ULL

struct rdma_addr {
	struct sockaddr_storage src_addr;
	struct sockaddr_storage dst_addr;
	struct rdma_dev_addr dev_addr;
};

struct rdma_route {
	struct rdma_addr addr;
	struct sa_path_rec *path_rec;
	int num_paths;
};

struct rdma_conn_param {
	const void *private_data;
	u8 private_data_len;
	u8 responder_resources;
	u8 initiator_depth;
	u8 flow_control;
	u8 retry_count;		/* ignored when accepting */
	u8 rnr_retry_count;
	/* Fields below ignored if a QP is created on the rdma_cm_id. */
	u8 srq;
	u32 qp_num;
	u32 qkey;
};

struct rdma_ud_param {
	const void *private_data;
	u8 private_data_len;
	struct rdma_ah_attr ah_attr;
	u32 qp_num;
	u32 qkey;
};

struct rdma_cm_event {
	enum rdma_cm_event_type	 event;
	int			 status;
	union {
		struct rdma_conn_param	conn;
		struct rdma_ud_param	ud;
	} param;
};

struct rdma_cm_id;

/**
 * rdma_cm_event_handler - Callback used to report user events.
 *
 * Notes: Users may not call rdma_destroy_id from this callback to destroy
 *   the passed in id, or a corresponding listen id.  Returning a
 *   non-zero value from the callback will destroy the passed in id.
 */
typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id,
				     struct rdma_cm_event *event);

struct rdma_cm_id {
	struct ib_device	*device;
	void			*context;
	struct ib_qp		*qp;
	rdma_cm_event_handler	 event_handler;
	struct rdma_route	 route;
	enum rdma_ucm_port_space ps;
	enum ib_qp_type		 qp_type;
	u8			 port_num;
};

struct rdma_cm_id *__rdma_create_id(struct net *net,
				    rdma_cm_event_handler event_handler,
				    void *context, enum rdma_ucm_port_space ps,
				    enum ib_qp_type qp_type,
				    const char *caller);

/**
 * rdma_create_id - Create an RDMA identifier.
 *
 * @net: The network namespace in which to create the new id.
 * @event_handler: User callback invoked to report events associated with the
 *   returned rdma_id.
 * @context: User specified context associated with the id.
 * @ps: RDMA port space.
 * @qp_type: type of queue pair associated with the id.
 *
 * Returns a new rdma_cm_id. The id holds a reference on the network
 * namespace until it is destroyed.
 *
 * The event handler callback serializes on the id's mutex and is
 * allowed to sleep.
 */
#define rdma_create_id(net, event_handler, context, ps, qp_type) \
	__rdma_create_id((net), (event_handler), (context), (ps), (qp_type), \
			 KBUILD_MODNAME)

/**
  * rdma_destroy_id - Destroys an RDMA identifier.
  *
  * @id: RDMA identifier.
  *
  * Note: calling this function has the effect of canceling in-flight
  * asynchronous operations associated with the id.
  */
void rdma_destroy_id(struct rdma_cm_id *id);

/**
 * rdma_bind_addr - Bind an RDMA identifier to a source address and
 *   associated RDMA device, if needed.
 *
 * @id: RDMA identifier.
 * @addr: Local address information.  Wildcard values are permitted.
 *
 * This associates a source address with the RDMA identifier before calling
 * rdma_listen.  If a specific local address is given, the RDMA identifier will
 * be bound to a local RDMA device.
 */
int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr);

/**
 * rdma_resolve_addr - Resolve destination and optional source addresses
 *   from IP addresses to an RDMA address.  If successful, the specified
 *   rdma_cm_id will be bound to a local device.
 *
 * @id: RDMA identifier.
 * @src_addr: Source address information.  This parameter may be NULL.
 * @dst_addr: Destination address information.
 * @timeout_ms: Time to wait for resolution to complete.
 */
int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
		      const struct sockaddr *dst_addr,
		      unsigned long timeout_ms);

/**
 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier
 *   into route information needed to establish a connection.
 *
 * This is called on the client side of a connection.
 * Users must have first called rdma_resolve_addr to resolve a dst_addr
 * into an RDMA address before calling this routine.
 */
int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms);

/**
 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA
 * identifier.
 *
 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA
 * through their states.
 */
int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
		   struct ib_qp_init_attr *qp_init_attr);

/**
 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA
 * identifier.
 *
 * Users must destroy any QP associated with an RDMA identifier before
 * destroying the RDMA ID.
 */
void rdma_destroy_qp(struct rdma_cm_id *id);

/**
 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning
 *   to a specified QP state.
 * @id: Communication identifier associated with the QP attributes to
 *   initialize.
 * @qp_attr: On input, specifies the desired QP state.  On output, the
 *   mandatory and desired optional attributes will be set in order to
 *   modify the QP to the specified state.
 * @qp_attr_mask: The QP attribute mask that may be used to transition the
 *   QP to the specified state.
 *
 * Users must set the @qp_attr->qp_state to the desired QP state.  This call
 * will set all required attributes for the given transition, along with
 * known optional attributes.  Users may override the attributes returned from
 * this call before calling ib_modify_qp.
 *
 * Users that wish to have their QP automatically transitioned through its
 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp().
 */
int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
		       int *qp_attr_mask);

/**
 * rdma_connect - Initiate an active connection request.
 * @id: Connection identifier to connect.
 * @conn_param: Connection information used for connected QPs.
 *
 * Users must have resolved a route for the rdma_cm_id to connect with
 * by having called rdma_resolve_route before calling this routine.
 *
 * This call will either connect to a remote QP or obtain remote QP
 * information for unconnected rdma_cm_id's.  The actual operation is
 * based on the rdma_cm_id's port space.
 */
int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param);

/**
 * rdma_listen - This function is called by the passive side to
 *   listen for incoming connection requests.
 *
 * Users must have bound the rdma_cm_id to a local address by calling
 * rdma_bind_addr before calling this routine.
 */
int rdma_listen(struct rdma_cm_id *id, int backlog);

int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
		  const char *caller);

/**
 * rdma_accept - Called to accept a connection request or response.
 * @id: Connection identifier associated with the request.
 * @conn_param: Information needed to establish the connection.  This must be
 *   provided if accepting a connection request.  If accepting a connection
 *   response, this parameter must be NULL.
 *
 * Typically, this routine is only called by the listener to accept a connection
 * request.  It must also be called on the active side of a connection if the
 * user is performing their own QP transitions.
 *
 * In the case of error, a reject message is sent to the remote side and the
 * state of the qp associated with the id is modified to error, such that any
 * previously posted receive buffers would be flushed.
 */
#define rdma_accept(id, conn_param) \
	__rdma_accept((id), (conn_param),  KBUILD_MODNAME)

/**
 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has
 * occurred on the connection.
 * @id: Connection identifier to transition to established.
 * @event: Asynchronous event.
 *
 * This routine should be invoked by users to notify the CM of relevant
 * communication events.  Events that should be reported to the CM and
 * when to report them are:
 *
 * IB_EVENT_COMM_EST - Used when a message is received on a connected
 *    QP before an RTU has been received.
 */
int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);

/**
 * rdma_reject - Called to reject a connection request or response.
 */
int rdma_reject(struct rdma_cm_id *id, const void *private_data,
		u8 private_data_len);

/**
 * rdma_disconnect - This function disconnects the associated QP and
 *   transitions it into the error state.
 */
int rdma_disconnect(struct rdma_cm_id *id);

/**
 * rdma_join_multicast - Join the multicast group specified by the given
 *   address.
 * @id: Communication identifier associated with the request.
 * @addr: Multicast address identifying the group to join.
 * @join_state: Multicast JoinState bitmap requested by port.
 *		Bitmap is based on IB_SA_MCMEMBER_REC_JOIN_STATE bits.
 * @context: User-defined context associated with the join request, returned
 * to the user through the private_data pointer in multicast events.
 */
int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
			u8 join_state, void *context);

/**
 * rdma_leave_multicast - Leave the multicast group specified by the given
 *   address.
 */
void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);

/**
 * rdma_set_service_type - Set the type of service associated with a
 *   connection identifier.
 * @id: Communication identifier to associated with service type.
 * @tos: Type of service.
 *
 * The type of service is interpretted as a differentiated service
 * field (RFC 2474).  The service type should be specified before
 * performing route resolution, as existing communication on the
 * connection identifier may be unaffected.  The type of service
 * requested may not be supported by the network to all destinations.
 */
void rdma_set_service_type(struct rdma_cm_id *id, int tos);

/**
 * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
 *    the rdma_cm_id.
 * @id: Communication identifier to configure.
 * @reuse: Value indicating if the bound address is reusable.
 *
 * Reuse must be set before an address is bound to the id.
 */
int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);

/**
 * rdma_set_afonly - Specify that listens are restricted to the
 *    bound address family only.
 * @id: Communication identifer to configure.
 * @afonly: Value indicating if listens are restricted.
 *
 * Must be set before identifier is in the listening state.
 */
int rdma_set_afonly(struct rdma_cm_id *id, int afonly);

int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout);
 /**
 * rdma_get_service_id - Return the IB service ID for a specified address.
 * @id: Communication identifier associated with the address.
 * @addr: Address for the service ID.
 */
__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr);

/**
 * rdma_reject_msg - return a pointer to a reject message string.
 * @id: Communication identifier that received the REJECT event.
 * @reason: Value returned in the REJECT event status field.
 */
const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
						int reason);
/**
 * rdma_is_consumer_reject - return true if the consumer rejected the connect
 *                           request.
 * @id: Communication identifier that received the REJECT event.
 * @reason: Value returned in the REJECT event status field.
 */
bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason);

/**
 * rdma_consumer_reject_data - return the consumer reject private data and
 *			       length, if any.
 * @id: Communication identifier that received the REJECT event.
 * @ev: RDMA CM reject event.
 * @data_len: Pointer to the resulting length of the consumer data.
 */
const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
				      struct rdma_cm_event *ev, u8 *data_len);

/**
 * rdma_read_gids - Return the SGID and DGID used for establishing
 *                  connection. This can be used after rdma_resolve_addr()
 *                  on client side. This can be use on new connection
 *                  on server side. This is applicable to IB, RoCE, iWarp.
 *                  If cm_id is not bound yet to the RDMA device, it doesn't
 *                  copy and SGID or DGID to the given pointers.
 * @id: Communication identifier whose GIDs are queried.
 * @sgid: Pointer to SGID where SGID will be returned. It is optional.
 * @dgid: Pointer to DGID where DGID will be returned. It is optional.
 * Note: This API should not be used by any new ULPs or new code.
 * Instead, users interested in querying GIDs should refer to path record
 * of the rdma_cm_id to query the GIDs.
 * This API is provided for compatibility for existing users.
 */

void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
		    union ib_gid *dgid);

struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *cm_id);
struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res);

#endif /* RDMA_CM_H */