1 /*
2  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
3  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
4  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6  *
7  * This software is available to you under a choice of one of two
8  * licenses.  You may choose to be licensed under the terms of the GNU
9  * General Public License (GPL) Version 2, available from the file
10  * COPYING in the main directory of this source tree, or the
11  * OpenIB.org BSD license below:
12  *
13  *     Redistribution and use in source and binary forms, with or
14  *     without modification, are permitted provided that the following
15  *     conditions are met:
16  *
17  *      - Redistributions of source code must retain the above
18  *        copyright notice, this list of conditions and the following
19  *        disclaimer.
20  *
21  *      - Redistributions in binary form must reproduce the above
22  *        copyright notice, this list of conditions and the following
23  *        disclaimer in the documentation and/or other materials
24  *        provided with the distribution.
25  *
26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33  * SOFTWARE.
34  */
35 #if !defined(IB_CM_H)
36 #define IB_CM_H
37 
38 #include <rdma/ib_mad.h>
39 #include <rdma/ib_sa.h>
40 
41 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
42 extern struct class cm_class;
43 
44 enum ib_cm_state {
45 	IB_CM_IDLE,
46 	IB_CM_LISTEN,
47 	IB_CM_REQ_SENT,
48 	IB_CM_REQ_RCVD,
49 	IB_CM_MRA_REQ_SENT,
50 	IB_CM_MRA_REQ_RCVD,
51 	IB_CM_REP_SENT,
52 	IB_CM_REP_RCVD,
53 	IB_CM_MRA_REP_SENT,
54 	IB_CM_MRA_REP_RCVD,
55 	IB_CM_ESTABLISHED,
56 	IB_CM_DREQ_SENT,
57 	IB_CM_DREQ_RCVD,
58 	IB_CM_TIMEWAIT,
59 	IB_CM_SIDR_REQ_SENT,
60 	IB_CM_SIDR_REQ_RCVD
61 };
62 
63 enum ib_cm_lap_state {
64 	IB_CM_LAP_UNINIT,
65 	IB_CM_LAP_IDLE,
66 	IB_CM_LAP_SENT,
67 	IB_CM_LAP_RCVD,
68 	IB_CM_MRA_LAP_SENT,
69 	IB_CM_MRA_LAP_RCVD,
70 };
71 
72 enum ib_cm_event_type {
73 	IB_CM_REQ_ERROR,
74 	IB_CM_REQ_RECEIVED,
75 	IB_CM_REP_ERROR,
76 	IB_CM_REP_RECEIVED,
77 	IB_CM_RTU_RECEIVED,
78 	IB_CM_USER_ESTABLISHED,
79 	IB_CM_DREQ_ERROR,
80 	IB_CM_DREQ_RECEIVED,
81 	IB_CM_DREP_RECEIVED,
82 	IB_CM_TIMEWAIT_EXIT,
83 	IB_CM_MRA_RECEIVED,
84 	IB_CM_REJ_RECEIVED,
85 	IB_CM_LAP_ERROR,
86 	IB_CM_LAP_RECEIVED,
87 	IB_CM_APR_RECEIVED,
88 	IB_CM_SIDR_REQ_ERROR,
89 	IB_CM_SIDR_REQ_RECEIVED,
90 	IB_CM_SIDR_REP_RECEIVED
91 };
92 
93 enum ib_cm_data_size {
94 	IB_CM_REQ_PRIVATE_DATA_SIZE	 = 92,
95 	IB_CM_MRA_PRIVATE_DATA_SIZE	 = 222,
96 	IB_CM_REJ_PRIVATE_DATA_SIZE	 = 148,
97 	IB_CM_REP_PRIVATE_DATA_SIZE	 = 196,
98 	IB_CM_RTU_PRIVATE_DATA_SIZE	 = 224,
99 	IB_CM_DREQ_PRIVATE_DATA_SIZE	 = 220,
100 	IB_CM_DREP_PRIVATE_DATA_SIZE	 = 224,
101 	IB_CM_REJ_ARI_LENGTH		 = 72,
102 	IB_CM_LAP_PRIVATE_DATA_SIZE	 = 168,
103 	IB_CM_APR_PRIVATE_DATA_SIZE	 = 148,
104 	IB_CM_APR_INFO_LENGTH		 = 72,
105 	IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216,
106 	IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136,
107 	IB_CM_SIDR_REP_INFO_LENGTH	 = 72,
108 };
109 
110 struct ib_cm_id;
111 
112 struct ib_cm_req_event_param {
113 	struct ib_cm_id		*listen_id;
114 
115 	/* P_Key that was used by the GMP's BTH header */
116 	u16			bth_pkey;
117 
118 	u8			port;
119 
120 	struct sa_path_rec	*primary_path;
121 	struct sa_path_rec	*alternate_path;
122 
123 	/*
124 	 * SGID attribute of the primary path. Currently only
125 	 * useful for RoCE. Alternate path GID attributes
126 	 * are not yet supported.
127 	 */
128 	const struct ib_gid_attr *ppath_sgid_attr;
129 
130 	__be64			remote_ca_guid;
131 	u32			remote_qkey;
132 	u32			remote_qpn;
133 	enum ib_qp_type		qp_type;
134 
135 	u32			starting_psn;
136 	u8			responder_resources;
137 	u8			initiator_depth;
138 	unsigned int		local_cm_response_timeout:5;
139 	unsigned int		flow_control:1;
140 	unsigned int		remote_cm_response_timeout:5;
141 	unsigned int		retry_count:3;
142 	unsigned int		rnr_retry_count:3;
143 	unsigned int		srq:1;
144 };
145 
146 struct ib_cm_rep_event_param {
147 	__be64			remote_ca_guid;
148 	u32			remote_qkey;
149 	u32			remote_qpn;
150 	u32			starting_psn;
151 	u8			responder_resources;
152 	u8			initiator_depth;
153 	unsigned int		target_ack_delay:5;
154 	unsigned int		failover_accepted:2;
155 	unsigned int		flow_control:1;
156 	unsigned int		rnr_retry_count:3;
157 	unsigned int		srq:1;
158 };
159 
160 enum ib_cm_rej_reason {
161 	IB_CM_REJ_NO_QP				= 1,
162 	IB_CM_REJ_NO_EEC			= 2,
163 	IB_CM_REJ_NO_RESOURCES			= 3,
164 	IB_CM_REJ_TIMEOUT			= 4,
165 	IB_CM_REJ_UNSUPPORTED			= 5,
166 	IB_CM_REJ_INVALID_COMM_ID		= 6,
167 	IB_CM_REJ_INVALID_COMM_INSTANCE		= 7,
168 	IB_CM_REJ_INVALID_SERVICE_ID		= 8,
169 	IB_CM_REJ_INVALID_TRANSPORT_TYPE	= 9,
170 	IB_CM_REJ_STALE_CONN			= 10,
171 	IB_CM_REJ_RDC_NOT_EXIST			= 11,
172 	IB_CM_REJ_INVALID_GID			= 12,
173 	IB_CM_REJ_INVALID_LID			= 13,
174 	IB_CM_REJ_INVALID_SL			= 14,
175 	IB_CM_REJ_INVALID_TRAFFIC_CLASS		= 15,
176 	IB_CM_REJ_INVALID_HOP_LIMIT		= 16,
177 	IB_CM_REJ_INVALID_PACKET_RATE		= 17,
178 	IB_CM_REJ_INVALID_ALT_GID		= 18,
179 	IB_CM_REJ_INVALID_ALT_LID		= 19,
180 	IB_CM_REJ_INVALID_ALT_SL		= 20,
181 	IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS	= 21,
182 	IB_CM_REJ_INVALID_ALT_HOP_LIMIT		= 22,
183 	IB_CM_REJ_INVALID_ALT_PACKET_RATE	= 23,
184 	IB_CM_REJ_PORT_CM_REDIRECT		= 24,
185 	IB_CM_REJ_PORT_REDIRECT			= 25,
186 	IB_CM_REJ_INVALID_MTU			= 26,
187 	IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES	= 27,
188 	IB_CM_REJ_CONSUMER_DEFINED		= 28,
189 	IB_CM_REJ_INVALID_RNR_RETRY		= 29,
190 	IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID	= 30,
191 	IB_CM_REJ_INVALID_CLASS_VERSION		= 31,
192 	IB_CM_REJ_INVALID_FLOW_LABEL		= 32,
193 	IB_CM_REJ_INVALID_ALT_FLOW_LABEL	= 33
194 };
195 
196 struct ib_cm_rej_event_param {
197 	enum ib_cm_rej_reason	reason;
198 	void			*ari;
199 	u8			ari_length;
200 };
201 
202 struct ib_cm_mra_event_param {
203 	u8	service_timeout;
204 };
205 
206 struct ib_cm_lap_event_param {
207 	struct sa_path_rec	*alternate_path;
208 };
209 
210 enum ib_cm_apr_status {
211 	IB_CM_APR_SUCCESS,
212 	IB_CM_APR_INVALID_COMM_ID,
213 	IB_CM_APR_UNSUPPORTED,
214 	IB_CM_APR_REJECT,
215 	IB_CM_APR_REDIRECT,
216 	IB_CM_APR_IS_CURRENT,
217 	IB_CM_APR_INVALID_QPN_EECN,
218 	IB_CM_APR_INVALID_LID,
219 	IB_CM_APR_INVALID_GID,
220 	IB_CM_APR_INVALID_FLOW_LABEL,
221 	IB_CM_APR_INVALID_TCLASS,
222 	IB_CM_APR_INVALID_HOP_LIMIT,
223 	IB_CM_APR_INVALID_PACKET_RATE,
224 	IB_CM_APR_INVALID_SL
225 };
226 
227 struct ib_cm_apr_event_param {
228 	enum ib_cm_apr_status	ap_status;
229 	void			*apr_info;
230 	u8			info_len;
231 };
232 
233 struct ib_cm_sidr_req_event_param {
234 	struct ib_cm_id		*listen_id;
235 	__be64			service_id;
236 
237 	/*
238 	 * SGID attribute of the request. Currently only
239 	 * useful for RoCE.
240 	 */
241 	const struct ib_gid_attr *sgid_attr;
242 	/* P_Key that was used by the GMP's BTH header */
243 	u16			bth_pkey;
244 	u8			port;
245 	u16			pkey;
246 };
247 
248 enum ib_cm_sidr_status {
249 	IB_SIDR_SUCCESS,
250 	IB_SIDR_UNSUPPORTED,
251 	IB_SIDR_REJECT,
252 	IB_SIDR_NO_QP,
253 	IB_SIDR_REDIRECT,
254 	IB_SIDR_UNSUPPORTED_VERSION
255 };
256 
257 struct ib_cm_sidr_rep_event_param {
258 	enum ib_cm_sidr_status	status;
259 	u32			qkey;
260 	u32			qpn;
261 	void			*info;
262 	const struct ib_gid_attr *sgid_attr;
263 	u8			info_len;
264 };
265 
266 struct ib_cm_event {
267 	enum ib_cm_event_type	event;
268 	union {
269 		struct ib_cm_req_event_param	req_rcvd;
270 		struct ib_cm_rep_event_param	rep_rcvd;
271 		/* No data for RTU received events. */
272 		struct ib_cm_rej_event_param	rej_rcvd;
273 		struct ib_cm_mra_event_param	mra_rcvd;
274 		struct ib_cm_lap_event_param	lap_rcvd;
275 		struct ib_cm_apr_event_param	apr_rcvd;
276 		/* No data for DREQ/DREP received events. */
277 		struct ib_cm_sidr_req_event_param sidr_req_rcvd;
278 		struct ib_cm_sidr_rep_event_param sidr_rep_rcvd;
279 		enum ib_wc_status		send_status;
280 	} param;
281 
282 	void			*private_data;
283 };
284 
285 #define CM_REQ_ATTR_ID		cpu_to_be16(0x0010)
286 #define CM_MRA_ATTR_ID		cpu_to_be16(0x0011)
287 #define CM_REJ_ATTR_ID		cpu_to_be16(0x0012)
288 #define CM_REP_ATTR_ID		cpu_to_be16(0x0013)
289 #define CM_RTU_ATTR_ID		cpu_to_be16(0x0014)
290 #define CM_DREQ_ATTR_ID		cpu_to_be16(0x0015)
291 #define CM_DREP_ATTR_ID		cpu_to_be16(0x0016)
292 #define CM_SIDR_REQ_ATTR_ID	cpu_to_be16(0x0017)
293 #define CM_SIDR_REP_ATTR_ID	cpu_to_be16(0x0018)
294 #define CM_LAP_ATTR_ID		cpu_to_be16(0x0019)
295 #define CM_APR_ATTR_ID		cpu_to_be16(0x001A)
296 
297 /**
298  * ib_cm_handler - User-defined callback to process communication events.
299  * @cm_id: Communication identifier associated with the reported event.
300  * @event: Information about the communication event.
301  *
302  * IB_CM_REQ_RECEIVED and IB_CM_SIDR_REQ_RECEIVED communication events
303  * generated as a result of listen requests result in the allocation of a
304  * new @cm_id.  The new @cm_id is returned to the user through this callback.
305  * Clients are responsible for destroying the new @cm_id.  For peer-to-peer
306  * IB_CM_REQ_RECEIVED and all other events, the returned @cm_id corresponds
307  * to a user's existing communication identifier.
308  *
309  * Users may not call ib_destroy_cm_id while in the context of this callback;
310  * however, returning a non-zero value instructs the communication manager to
311  * destroy the @cm_id after the callback completes.
312  */
313 typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
314 			     const struct ib_cm_event *event);
315 
316 struct ib_cm_id {
317 	ib_cm_handler		cm_handler;
318 	void			*context;
319 	struct ib_device	*device;
320 	__be64			service_id;
321 	__be64			service_mask;
322 	enum ib_cm_state	state;		/* internal CM/debug use */
323 	enum ib_cm_lap_state	lap_state;	/* internal CM/debug use */
324 	__be32			local_id;
325 	__be32			remote_id;
326 	u32			remote_cm_qpn;  /* 1 unless redirected */
327 };
328 
329 /**
330  * ib_create_cm_id - Allocate a communication identifier.
331  * @device: Device associated with the cm_id.  All related communication will
332  * be associated with the specified device.
333  * @cm_handler: Callback invoked to notify the user of CM events.
334  * @context: User specified context associated with the communication
335  *   identifier.
336  *
337  * Communication identifiers are used to track connection states, service
338  * ID resolution requests, and listen requests.
339  */
340 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
341 				 ib_cm_handler cm_handler,
342 				 void *context);
343 
344 /**
345  * ib_destroy_cm_id - Destroy a connection identifier.
346  * @cm_id: Connection identifier to destroy.
347  *
348  * This call blocks until the connection identifier is destroyed.
349  */
350 void ib_destroy_cm_id(struct ib_cm_id *cm_id);
351 
352 #define IB_SERVICE_ID_AGN_MASK	cpu_to_be64(0xFF00000000000000ULL)
353 #define IB_CM_ASSIGN_SERVICE_ID	cpu_to_be64(0x0200000000000000ULL)
354 #define IB_CMA_SERVICE_ID	cpu_to_be64(0x0000000001000000ULL)
355 #define IB_CMA_SERVICE_ID_MASK	cpu_to_be64(0xFFFFFFFFFF000000ULL)
356 #define IB_SDP_SERVICE_ID	cpu_to_be64(0x0000000000010000ULL)
357 #define IB_SDP_SERVICE_ID_MASK	cpu_to_be64(0xFFFFFFFFFFFF0000ULL)
358 
359 /**
360  * ib_cm_listen - Initiates listening on the specified service ID for
361  *   connection and service ID resolution requests.
362  * @cm_id: Connection identifier associated with the listen request.
363  * @service_id: Service identifier matched against incoming connection
364  *   and service ID resolution requests.  The service ID should be specified
365  *   network-byte order.  If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
366  *   assign a service ID to the caller.
367  * @service_mask: Mask applied to service ID used to listen across a
368  *   range of service IDs.  If set to 0, the service ID is matched
369  *   exactly.  This parameter is ignored if %service_id is set to
370  *   IB_CM_ASSIGN_SERVICE_ID.
371  */
372 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
373 		 __be64 service_mask);
374 
375 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
376 				     ib_cm_handler cm_handler,
377 				     __be64 service_id);
378 
379 struct ib_cm_req_param {
380 	struct sa_path_rec	*primary_path;
381 	struct sa_path_rec	*alternate_path;
382 	const struct ib_gid_attr *ppath_sgid_attr;
383 	__be64			service_id;
384 	u32			qp_num;
385 	enum ib_qp_type		qp_type;
386 	u32			starting_psn;
387 	const void		*private_data;
388 	u8			private_data_len;
389 	u8			peer_to_peer;
390 	u8			responder_resources;
391 	u8			initiator_depth;
392 	u8			remote_cm_response_timeout;
393 	u8			flow_control;
394 	u8			local_cm_response_timeout;
395 	u8			retry_count;
396 	u8			rnr_retry_count;
397 	u8			max_cm_retries;
398 	u8			srq;
399 };
400 
401 /**
402  * ib_send_cm_req - Sends a connection request to the remote node.
403  * @cm_id: Connection identifier that will be associated with the
404  *   connection request.
405  * @param: Connection request information needed to establish the
406  *   connection.
407  */
408 int ib_send_cm_req(struct ib_cm_id *cm_id,
409 		   struct ib_cm_req_param *param);
410 
411 struct ib_cm_rep_param {
412 	u32		qp_num;
413 	u32		starting_psn;
414 	const void	*private_data;
415 	u8		private_data_len;
416 	u8		responder_resources;
417 	u8		initiator_depth;
418 	u8		failover_accepted;
419 	u8		flow_control;
420 	u8		rnr_retry_count;
421 	u8		srq;
422 };
423 
424 /**
425  * ib_send_cm_rep - Sends a connection reply in response to a connection
426  *   request.
427  * @cm_id: Connection identifier that will be associated with the
428  *   connection request.
429  * @param: Connection reply information needed to establish the
430  *   connection.
431  */
432 int ib_send_cm_rep(struct ib_cm_id *cm_id,
433 		   struct ib_cm_rep_param *param);
434 
435 /**
436  * ib_send_cm_rtu - Sends a connection ready to use message in response
437  *   to a connection reply message.
438  * @cm_id: Connection identifier associated with the connection request.
439  * @private_data: Optional user-defined private data sent with the
440  *   ready to use message.
441  * @private_data_len: Size of the private data buffer, in bytes.
442  */
443 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
444 		   const void *private_data,
445 		   u8 private_data_len);
446 
447 /**
448  * ib_send_cm_dreq - Sends a disconnection request for an existing
449  *   connection.
450  * @cm_id: Connection identifier associated with the connection being
451  *   released.
452  * @private_data: Optional user-defined private data sent with the
453  *   disconnection request message.
454  * @private_data_len: Size of the private data buffer, in bytes.
455  */
456 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
457 		    const void *private_data,
458 		    u8 private_data_len);
459 
460 /**
461  * ib_send_cm_drep - Sends a disconnection reply to a disconnection request.
462  * @cm_id: Connection identifier associated with the connection being
463  *   released.
464  * @private_data: Optional user-defined private data sent with the
465  *   disconnection reply message.
466  * @private_data_len: Size of the private data buffer, in bytes.
467  *
468  * If the cm_id is in the correct state, the CM will transition the connection
469  * to the timewait state, even if an error occurs sending the DREP message.
470  */
471 int ib_send_cm_drep(struct ib_cm_id *cm_id,
472 		    const void *private_data,
473 		    u8 private_data_len);
474 
475 /**
476  * ib_cm_notify - Notifies the CM of an event reported to the consumer.
477  * @cm_id: Connection identifier to transition to established.
478  * @event: Type of event.
479  *
480  * This routine should be invoked by users to notify the CM of relevant
481  * communication events.  Events that should be reported to the CM and
482  * when to report them are:
483  *
484  * IB_EVENT_COMM_EST - Used when a message is received on a connected
485  *    QP before an RTU has been received.
486  * IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over
487  *   to the alternate path.
488  */
489 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event);
490 
491 /**
492  * ib_send_cm_rej - Sends a connection rejection message to the
493  *   remote node.
494  * @cm_id: Connection identifier associated with the connection being
495  *   rejected.
496  * @reason: Reason for the connection request rejection.
497  * @ari: Optional additional rejection information.
498  * @ari_length: Size of the additional rejection information, in bytes.
499  * @private_data: Optional user-defined private data sent with the
500  *   rejection message.
501  * @private_data_len: Size of the private data buffer, in bytes.
502  */
503 int ib_send_cm_rej(struct ib_cm_id *cm_id,
504 		   enum ib_cm_rej_reason reason,
505 		   void *ari,
506 		   u8 ari_length,
507 		   const void *private_data,
508 		   u8 private_data_len);
509 
510 #define IB_CM_MRA_FLAG_DELAY 0x80  /* Send MRA only after a duplicate msg */
511 
512 /**
513  * ib_send_cm_mra - Sends a message receipt acknowledgement to a connection
514  *   message.
515  * @cm_id: Connection identifier associated with the connection message.
516  * @service_timeout: The lower 5-bits specify the maximum time required for
517  *   the sender to reply to the connection message.  The upper 3-bits
518  *   specify additional control flags.
519  * @private_data: Optional user-defined private data sent with the
520  *   message receipt acknowledgement.
521  * @private_data_len: Size of the private data buffer, in bytes.
522  */
523 int ib_send_cm_mra(struct ib_cm_id *cm_id,
524 		   u8 service_timeout,
525 		   const void *private_data,
526 		   u8 private_data_len);
527 
528 /**
529  * ib_send_cm_lap - Sends a load alternate path request.
530  * @cm_id: Connection identifier associated with the load alternate path
531  *   message.
532  * @alternate_path: A path record that identifies the alternate path to
533  *   load.
534  * @private_data: Optional user-defined private data sent with the
535  *   load alternate path message.
536  * @private_data_len: Size of the private data buffer, in bytes.
537  */
538 int ib_send_cm_lap(struct ib_cm_id *cm_id,
539 		   struct sa_path_rec *alternate_path,
540 		   const void *private_data,
541 		   u8 private_data_len);
542 
543 /**
544  * ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning
545  *   to a specified QP state.
546  * @cm_id: Communication identifier associated with the QP attributes to
547  *   initialize.
548  * @qp_attr: On input, specifies the desired QP state.  On output, the
549  *   mandatory and desired optional attributes will be set in order to
550  *   modify the QP to the specified state.
551  * @qp_attr_mask: The QP attribute mask that may be used to transition the
552  *   QP to the specified state.
553  *
554  * Users must set the @qp_attr->qp_state to the desired QP state.  This call
555  * will set all required attributes for the given transition, along with
556  * known optional attributes.  Users may override the attributes returned from
557  * this call before calling ib_modify_qp.
558  */
559 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
560 		       struct ib_qp_attr *qp_attr,
561 		       int *qp_attr_mask);
562 
563 /**
564  * ib_send_cm_apr - Sends an alternate path response message in response to
565  *   a load alternate path request.
566  * @cm_id: Connection identifier associated with the alternate path response.
567  * @status: Reply status sent with the alternate path response.
568  * @info: Optional additional information sent with the alternate path
569  *   response.
570  * @info_length: Size of the additional information, in bytes.
571  * @private_data: Optional user-defined private data sent with the
572  *   alternate path response message.
573  * @private_data_len: Size of the private data buffer, in bytes.
574  */
575 int ib_send_cm_apr(struct ib_cm_id *cm_id,
576 		   enum ib_cm_apr_status status,
577 		   void *info,
578 		   u8 info_length,
579 		   const void *private_data,
580 		   u8 private_data_len);
581 
582 struct ib_cm_sidr_req_param {
583 	struct sa_path_rec	*path;
584 	const struct ib_gid_attr *sgid_attr;
585 	__be64			service_id;
586 	int			timeout_ms;
587 	const void		*private_data;
588 	u8			private_data_len;
589 	u8			max_cm_retries;
590 };
591 
592 /**
593  * ib_send_cm_sidr_req - Sends a service ID resolution request to the
594  *   remote node.
595  * @cm_id: Communication identifier that will be associated with the
596  *   service ID resolution request.
597  * @param: Service ID resolution request information.
598  */
599 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
600 			struct ib_cm_sidr_req_param *param);
601 
602 struct ib_cm_sidr_rep_param {
603 	u32			qp_num;
604 	u32			qkey;
605 	enum ib_cm_sidr_status	status;
606 	const void		*info;
607 	u8			info_length;
608 	const void		*private_data;
609 	u8			private_data_len;
610 };
611 
612 /**
613  * ib_send_cm_sidr_rep - Sends a service ID resolution reply to the
614  *   remote node.
615  * @cm_id: Communication identifier associated with the received service ID
616  *   resolution request.
617  * @param: Service ID resolution reply information.
618  */
619 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
620 			struct ib_cm_sidr_rep_param *param);
621 
622 /**
623  * ibcm_reject_msg - return a pointer to a reject message string.
624  * @reason: Value returned in the REJECT event status field.
625  */
626 const char *__attribute_const__ ibcm_reject_msg(int reason);
627 
628 #endif /* IB_CM_H */
629