aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/include/ib_mad.h
blob: 491b6f25b3b854afa6ac796d6f1042e4d7778b03 (plain) (blame)
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
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire 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.
 *
 * $Id: ib_mad.h 2775 2005-07-02 13:42:12Z halr $
 */

#if !defined( IB_MAD_H )
#define IB_MAD_H

#include <linux/pci.h>

#include <ib_verbs.h>

/* Management base version */
#define IB_MGMT_BASE_VERSION			1

/* Management classes */
#define IB_MGMT_CLASS_SUBN_LID_ROUTED		0x01
#define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE	0x81
#define IB_MGMT_CLASS_SUBN_ADM			0x03
#define IB_MGMT_CLASS_PERF_MGMT			0x04
#define IB_MGMT_CLASS_BM			0x05
#define IB_MGMT_CLASS_DEVICE_MGMT		0x06
#define IB_MGMT_CLASS_CM			0x07
#define IB_MGMT_CLASS_SNMP			0x08
#define IB_MGMT_CLASS_VENDOR_RANGE2_START	0x30
#define IB_MGMT_CLASS_VENDOR_RANGE2_END		0x4F

#define	IB_OPENIB_OUI				(0x001405)

/* Management methods */
#define IB_MGMT_METHOD_GET			0x01
#define IB_MGMT_METHOD_SET			0x02
#define IB_MGMT_METHOD_GET_RESP			0x81
#define IB_MGMT_METHOD_SEND			0x03
#define IB_MGMT_METHOD_TRAP			0x05
#define IB_MGMT_METHOD_REPORT			0x06
#define IB_MGMT_METHOD_REPORT_RESP		0x86
#define IB_MGMT_METHOD_TRAP_REPRESS		0x07

#define IB_MGMT_METHOD_RESP			0x80

#define IB_MGMT_MAX_METHODS			128

/* RMPP information */
#define IB_MGMT_RMPP_VERSION			1

#define IB_MGMT_RMPP_TYPE_DATA			1
#define IB_MGMT_RMPP_TYPE_ACK			2
#define IB_MGMT_RMPP_TYPE_STOP			3
#define IB_MGMT_RMPP_TYPE_ABORT			4

#define IB_MGMT_RMPP_FLAG_ACTIVE		1
#define IB_MGMT_RMPP_FLAG_FIRST			(1<<1)
#define IB_MGMT_RMPP_FLAG_LAST			(1<<2)

#define IB_MGMT_RMPP_NO_RESPTIME		0x1F

#define	IB_MGMT_RMPP_STATUS_SUCCESS		0
#define	IB_MGMT_RMPP_STATUS_RESX		1
#define	IB_MGMT_RMPP_STATUS_T2L			118
#define	IB_MGMT_RMPP_STATUS_BAD_LEN		119
#define	IB_MGMT_RMPP_STATUS_BAD_SEG		120
#define	IB_MGMT_RMPP_STATUS_BADT		121
#define	IB_MGMT_RMPP_STATUS_W2S			122
#define	IB_MGMT_RMPP_STATUS_S2B			123
#define	IB_MGMT_RMPP_STATUS_BAD_STATUS		124
#define	IB_MGMT_RMPP_STATUS_UNV			125
#define	IB_MGMT_RMPP_STATUS_TMR			126
#define	IB_MGMT_RMPP_STATUS_UNSPEC		127

#define IB_QP0		0
#define IB_QP1		__constant_htonl(1)
#define IB_QP1_QKEY	0x80010000
#define IB_QP_SET_QKEY	0x80000000

struct ib_mad_hdr {
	u8	base_version;
	u8	mgmt_class;
	u8	class_version;
	u8	method;
	u16	status;
	u16	class_specific;
	u64	tid;
	u16	attr_id;
	u16	resv;
	u32	attr_mod;
};

struct ib_rmpp_hdr {
	u8	rmpp_version;
	u8	rmpp_type;
	u8	rmpp_rtime_flags;
	u8	rmpp_status;
	u32	seg_num;
	u32	paylen_newwin;
};

typedef u64 __bitwise ib_sa_comp_mask;

#define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << n))

/*
 * ib_sa_hdr and ib_sa_mad structures must be packed because they have
 * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
 * lay them out wrong otherwise.  (And unfortunately they are sent on
 * the wire so we can't change the layout)
 */
struct ib_sa_hdr {
	u64			sm_key;
	u16			attr_offset;
	u16			reserved;
	ib_sa_comp_mask		comp_mask;
} __attribute__ ((packed));

struct ib_mad {
	struct ib_mad_hdr	mad_hdr;
	u8			data[232];
};

struct ib_rmpp_mad {
	struct ib_mad_hdr	mad_hdr;
	struct ib_rmpp_hdr	rmpp_hdr;
	u8			data[220];
};

struct ib_sa_mad {
	struct ib_mad_hdr	mad_hdr;
	struct ib_rmpp_hdr	rmpp_hdr;
	struct ib_sa_hdr	sa_hdr;
	u8			data[200];
} __attribute__ ((packed));

struct ib_vendor_mad {
	struct ib_mad_hdr	mad_hdr;
	struct ib_rmpp_hdr	rmpp_hdr;
	u8			reserved;
	u8			oui[3];
	u8			data[216];
};

/**
 * ib_mad_send_buf - MAD data buffer and work request for sends.
 * @mad: References an allocated MAD data buffer.  The size of the data
 *   buffer is specified in the @send_wr.length field.
 * @mapping: DMA mapping information.
 * @mad_agent: MAD agent that allocated the buffer.
 * @context: User-controlled context fields.
 * @send_wr: An initialized work request structure used when sending the MAD.
 *   The wr_id field of the work request is initialized to reference this
 *   data structure.
 * @sge: A scatter-gather list referenced by the work request.
 *
 * Users are responsible for initializing the MAD buffer itself, with the
 * exception of specifying the payload length field in any RMPP MAD.
 */
struct ib_mad_send_buf {
	struct ib_mad		*mad;
	DECLARE_PCI_UNMAP_ADDR(mapping)
	struct ib_mad_agent	*mad_agent;
	void			*context[2];
	struct ib_send_wr	send_wr;
	struct ib_sge		sge;
};

/**
 * ib_get_rmpp_resptime - Returns the RMPP response time.
 * @rmpp_hdr: An RMPP header.
 */
static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
{
	return rmpp_hdr->rmpp_rtime_flags >> 3;
}

/**
 * ib_get_rmpp_flags - Returns the RMPP flags.
 * @rmpp_hdr: An RMPP header.
 */
static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
{
	return rmpp_hdr->rmpp_rtime_flags & 0x7;
}

/**
 * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
 * @rmpp_hdr: An RMPP header.
 * @rtime: The response time to set.
 */
static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
{
	rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
}

/**
 * ib_set_rmpp_flags - Sets the flags in an RMPP header.
 * @rmpp_hdr: An RMPP header.
 * @flags: The flags to set.
 */
static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
{
	rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF1) |
				     (flags & 0x7);
}

struct ib_mad_agent;
struct ib_mad_send_wc;
struct ib_mad_recv_wc;

/**
 * ib_mad_send_handler - callback handler for a sent MAD.
 * @mad_agent: MAD agent that sent the MAD.
 * @mad_send_wc: Send work completion information on the sent MAD.
 */
typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
				    struct ib_mad_send_wc *mad_send_wc);

/**
 * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
 * @mad_agent: MAD agent that snooped the MAD.
 * @send_wr: Work request information on the sent MAD.
 * @mad_send_wc: Work completion information on the sent MAD.  Valid
 *   only for snooping that occurs on a send completion.
 *
 * Clients snooping MADs should not modify data referenced by the @send_wr
 * or @mad_send_wc.
 */
typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
				     struct ib_send_wr *send_wr,
				     struct ib_mad_send_wc *mad_send_wc);

/**
 * ib_mad_recv_handler - callback handler for a received MAD.
 * @mad_agent: MAD agent requesting the received MAD.
 * @mad_recv_wc: Received work completion information on the received MAD.
 *
 * MADs received in response to a send request operation will be handed to
 * the user after the send operation completes.  All data buffers given
 * to registered agents through this routine are owned by the receiving
 * client, except for snooping agents.  Clients snooping MADs should not
 * modify the data referenced by @mad_recv_wc.
 */
typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
				    struct ib_mad_recv_wc *mad_recv_wc);

/**
 * ib_mad_agent - Used to track MAD registration with the access layer.
 * @device: Reference to device registration is on.
 * @qp: Reference to QP used for sending and receiving MADs.
 * @mr: Memory region for system memory usable for DMA.
 * @recv_handler: Callback handler for a received MAD.
 * @send_handler: Callback handler for a sent MAD.
 * @snoop_handler: Callback handler for snooped sent MADs.
 * @context: User-specified context associated with this registration.
 * @hi_tid: Access layer assigned transaction ID for this client.
 *   Unsolicited MADs sent by this client will have the upper 32-bits
 *   of their TID set to this value.
 * @port_num: Port number on which QP is registered
 * @rmpp_version: If set, indicates the RMPP version used by this agent.
 */
struct ib_mad_agent {
	struct ib_device	*device;
	struct ib_qp		*qp;
	struct ib_mr		*mr;
	ib_mad_recv_handler	recv_handler;
	ib_mad_send_handler	send_handler;
	ib_mad_snoop_handler	snoop_handler;
	void			*context;
	u32			hi_tid;
	u8			port_num;
	u8			rmpp_version;
};

/**
 * ib_mad_send_wc - MAD send completion information.
 * @wr_id: Work request identifier associated with the send MAD request.
 * @status: Completion status.
 * @vendor_err: Optional vendor error information returned with a failed
 *   request.
 */
struct ib_mad_send_wc {
	u64			wr_id;
	enum ib_wc_status	status;
	u32			vendor_err;
};

/**
 * ib_mad_recv_buf - received MAD buffer information.
 * @list: Reference to next data buffer for a received RMPP MAD.
 * @grh: References a data buffer containing the global route header.
 *   The data refereced by this buffer is only valid if the GRH is
 *   valid.
 * @mad: References the start of the received MAD.
 */
struct ib_mad_recv_buf {
	struct list_head	list;
	struct ib_grh		*grh;
	struct ib_mad		*mad;
};

/**
 * ib_mad_recv_wc - received MAD information.
 * @wc: Completion information for the received data.
 * @recv_buf: Specifies the location of the received data buffer(s).
 * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
 * @mad_len: The length of the received MAD, without duplicated headers.
 *
 * For received response, the wr_id field of the wc is set to the wr_id
 *   for the corresponding send request.
 */
struct ib_mad_recv_wc {
	struct ib_wc		*wc;
	struct ib_mad_recv_buf	recv_buf;
	struct list_head	rmpp_list;
	int			mad_len;
};

/**
 * ib_mad_reg_req - MAD registration request
 * @mgmt_class: Indicates which management class of MADs should be receive
 *   by the caller.  This field is only required if the user wishes to
 *   receive unsolicited MADs, otherwise it should be 0.
 * @mgmt_class_version: Indicates which version of MADs for the given
 *   management class to receive.
 * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
 *   in the range from 0x30 to 0x4f. Otherwise not used.
 * @method_mask: The caller will receive unsolicited MADs for any method
 *   where @method_mask = 1.
 */
struct ib_mad_reg_req {
	u8	mgmt_class;
	u8	mgmt_class_version;
	u8	oui[3];
	DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
};

/**
 * ib_register_mad_agent - Register to send/receive MADs.
 * @device: The device to register with.
 * @port_num: The port on the specified device to use.
 * @qp_type: Specifies which QP to access.  Must be either
 *   IB_QPT_SMI or IB_QPT_GSI.
 * @mad_reg_req: Specifies which unsolicited MADs should be received
 *   by the caller.  This parameter may be NULL if the caller only
 *   wishes to receive solicited responses.
 * @rmpp_version: If set, indicates that the client will send
 *   and receive MADs that contain the RMPP header for the given version.
 *   If set to 0, indicates that RMPP is not used by this client.
 * @send_handler: The completion callback routine invoked after a send
 *   request has completed.
 * @recv_handler: The completion callback routine invoked for a received
 *   MAD.
 * @context: User specified context associated with the registration.
 */
struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
					   u8 port_num,
					   enum ib_qp_type qp_type,
					   struct ib_mad_reg_req *mad_reg_req,
					   u8 rmpp_version,
					   ib_mad_send_handler send_handler,
					   ib_mad_recv_handler recv_handler,
					   void *context);

enum ib_mad_snoop_flags {
	/*IB_MAD_SNOOP_POSTED_SENDS	   = 1,*/
	/*IB_MAD_SNOOP_RMPP_SENDS	   = (1<<1),*/
	IB_MAD_SNOOP_SEND_COMPLETIONS	   = (1<<2),
	/*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
	IB_MAD_SNOOP_RECVS		   = (1<<4)
	/*IB_MAD_SNOOP_RMPP_RECVS	   = (1<<5),*/
	/*IB_MAD_SNOOP_REDIRECTED_QPS	   = (1<<6)*/
};

/**
 * ib_register_mad_snoop - Register to snoop sent and received MADs.
 * @device: The device to register with.
 * @port_num: The port on the specified device to use.
 * @qp_type: Specifies which QP traffic to snoop.  Must be either
 *   IB_QPT_SMI or IB_QPT_GSI.
 * @mad_snoop_flags: Specifies information where snooping occurs.
 * @send_handler: The callback routine invoked for a snooped send.
 * @recv_handler: The callback routine invoked for a snooped receive.
 * @context: User specified context associated with the registration.
 */
struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
					   u8 port_num,
					   enum ib_qp_type qp_type,
					   int mad_snoop_flags,
					   ib_mad_snoop_handler snoop_handler,
					   ib_mad_recv_handler recv_handler,
					   void *context);

/**
 * ib_unregister_mad_agent - Unregisters a client from using MAD services.
 * @mad_agent: Corresponding MAD registration request to deregister.
 *
 * After invoking this routine, MAD services are no longer usable by the
 * client on the associated QP.
 */
int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);

/**
 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 *   with the registered client.
 * @mad_agent: Specifies the associated registration to post the send to.
 * @send_wr: Specifies the information needed to send the MAD(s).
 * @bad_send_wr: Specifies the MAD on which an error was encountered.
 *
 * Sent MADs are not guaranteed to complete in the order that they were posted.
 *
 * If the MAD requires RMPP, the data buffer should contain a single copy
 * of the common MAD, RMPP, and class specific headers, followed by the class
 * defined data.  If the class defined data would not divide evenly into
 * RMPP segments, then space must be allocated at the end of the referenced
 * buffer for any required padding.  To indicate the amount of class defined
 * data being transferred, the paylen_newwin field in the RMPP header should
 * be set to the size of the class specific header plus the amount of class
 * defined data being transferred.  The paylen_newwin field should be
 * specified in network-byte order.
 */
int ib_post_send_mad(struct ib_mad_agent *mad_agent,
		     struct ib_send_wr *send_wr,
		     struct ib_send_wr **bad_send_wr);

/**
 * ib_coalesce_recv_mad - Coalesces received MAD data into a single buffer.
 * @mad_recv_wc: Work completion information for a received MAD.
 * @buf: User-provided data buffer to receive the coalesced buffers.  The
 *   referenced buffer should be at least the size of the mad_len specified
 *   by @mad_recv_wc.
 *
 * This call copies a chain of received MAD segments into a single data buffer,
 * removing duplicated headers.
 */
void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf);

/**
 * ib_free_recv_mad - Returns data buffers used to receive a MAD.
 * @mad_recv_wc: Work completion information for a received MAD.
 *
 * Clients receiving MADs through their ib_mad_recv_handler must call this
 * routine to return the work completion buffers to the access layer.
 */
void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);

/**
 * ib_cancel_mad - Cancels an outstanding send MAD operation.
 * @mad_agent: Specifies the registration associated with sent MAD.
 * @wr_id: Indicates the work request identifier of the MAD to cancel.
 *
 * MADs will be returned to the user through the corresponding
 * ib_mad_send_handler.
 */
void ib_cancel_mad(struct ib_mad_agent *mad_agent, u64 wr_id);

/**
 * ib_modify_mad - Modifies an outstanding send MAD operation.
 * @mad_agent: Specifies the registration associated with sent MAD.
 * @wr_id: Indicates the work request identifier of the MAD to modify.
 * @timeout_ms: New timeout value for sent MAD.
 *
 * This call will reset the timeout value for a sent MAD to the specified
 * value.
 */
int ib_modify_mad(struct ib_mad_agent *mad_agent, u64 wr_id, u32 timeout_ms);

/**
 * ib_redirect_mad_qp - Registers a QP for MAD services.
 * @qp: Reference to a QP that requires MAD services.
 * @rmpp_version: If set, indicates that the client will send
 *   and receive MADs that contain the RMPP header for the given version.
 *   If set to 0, indicates that RMPP is not used by this client.
 * @send_handler: The completion callback routine invoked after a send
 *   request has completed.
 * @recv_handler: The completion callback routine invoked for a received
 *   MAD.
 * @context: User specified context associated with the registration.
 *
 * Use of this call allows clients to use MAD services, such as RMPP,
 * on user-owned QPs.  After calling this routine, users may send
 * MADs on the specified QP by calling ib_mad_post_send.
 */
struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
					u8 rmpp_version,
					ib_mad_send_handler send_handler,
					ib_mad_recv_handler recv_handler,
					void *context);

/**
 * ib_process_mad_wc - Processes a work completion associated with a
 *   MAD sent or received on a redirected QP.
 * @mad_agent: Specifies the registered MAD service using the redirected QP.
 * @wc: References a work completion associated with a sent or received
 *   MAD segment.
 *
 * This routine is used to complete or continue processing on a MAD request.
 * If the work completion is associated with a send operation, calling
 * this routine is required to continue an RMPP transfer or to wait for a
 * corresponding response, if it is a request.  If the work completion is
 * associated with a receive operation, calling this routine is required to
 * process an inbound or outbound RMPP transfer, or to match a response MAD
 * with its corresponding request.
 */
int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
		      struct ib_wc *wc);

/**
 * ib_create_send_mad - Allocate and initialize a data buffer and work request
 *   for sending a MAD.
 * @mad_agent: Specifies the registered MAD service to associate with the MAD.
 * @remote_qpn: Specifies the QPN of the receiving node.
 * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
 *   is valid only if the remote_qpn is QP 1.
 * @ah: References the address handle used to transfer to the remote node.
 * @rmpp_active: Indicates if the send will enable RMPP.
 * @hdr_len: Indicates the size of the data header of the MAD.  This length
 *   should include the common MAD header, RMPP header, plus any class
 *   specific header.
 * @data_len: Indicates the size of any user-transferred data.  The call will
 *   automatically adjust the allocated buffer size to account for any
 *   additional padding that may be necessary.
 * @gfp_mask: GFP mask used for the memory allocation.
 *
 * This is a helper routine that may be used to allocate a MAD.  Users are
 * not required to allocate outbound MADs using this call.  The returned
 * MAD send buffer will reference a data buffer usable for sending a MAD, along
 * with an initialized work request structure.  Users may modify the returned
 * MAD data buffer or work request before posting the send.
 *
 * The returned data buffer will be cleared.  Users are responsible for
 * initializing the common MAD and any class specific headers.  If @rmpp_active
 * is set, the RMPP header will be initialized for sending.
 */
struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
					    u32 remote_qpn, u16 pkey_index,
					    struct ib_ah *ah, int rmpp_active,
					    int hdr_len, int data_len,
					    unsigned int __nocast gfp_mask);

/**
 * ib_free_send_mad - Returns data buffers used to send a MAD.
 * @send_buf: Previously allocated send data buffer.
 */
void ib_free_send_mad(struct ib_mad_send_buf *send_buf);

#endif /* IB_MAD_H */