1 /*
2  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
3  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
4  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
5  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
6  * Copyright (c) 2004-2006 Voltaire Corporation.  All rights reserved.
7  *
8  * This software is available to you under a choice of one of two
9  * licenses.  You may choose to be licensed under the terms of the GNU
10  * General Public License (GPL) Version 2, available from the file
11  * COPYING in the main directory of this source tree, or the
12  * OpenIB.org BSD license below:
13  *
14  *     Redistribution and use in source and binary forms, with or
15  *     without modification, are permitted provided that the following
16  *     conditions are met:
17  *
18  *      - Redistributions of source code must retain the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer.
21  *
22  *      - Redistributions in binary form must reproduce the above
23  *        copyright notice, this list of conditions and the following
24  *        disclaimer in the documentation and/or other materials
25  *        provided with the distribution.
26  *
27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34  * SOFTWARE.
35  */
36 
37 #if !defined(IB_MAD_H)
38 #define IB_MAD_H
39 
40 #include <linux/list.h>
41 
42 #include <rdma/ib_verbs.h>
43 
44 /* Management base version */
45 #define IB_MGMT_BASE_VERSION			1
46 
47 /* Management classes */
48 #define IB_MGMT_CLASS_SUBN_LID_ROUTED		0x01
49 #define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE	0x81
50 #define IB_MGMT_CLASS_SUBN_ADM			0x03
51 #define IB_MGMT_CLASS_PERF_MGMT			0x04
52 #define IB_MGMT_CLASS_BM			0x05
53 #define IB_MGMT_CLASS_DEVICE_MGMT		0x06
54 #define IB_MGMT_CLASS_CM			0x07
55 #define IB_MGMT_CLASS_SNMP			0x08
56 #define IB_MGMT_CLASS_DEVICE_ADM		0x10
57 #define IB_MGMT_CLASS_BOOT_MGMT			0x11
58 #define IB_MGMT_CLASS_BIS			0x12
59 #define IB_MGMT_CLASS_CONG_MGMT			0x21
60 #define IB_MGMT_CLASS_VENDOR_RANGE2_START	0x30
61 #define IB_MGMT_CLASS_VENDOR_RANGE2_END		0x4F
62 
63 #define	IB_OPENIB_OUI				(0x001405)
64 
65 /* Management methods */
66 #define IB_MGMT_METHOD_GET			0x01
67 #define IB_MGMT_METHOD_SET			0x02
68 #define IB_MGMT_METHOD_GET_RESP			0x81
69 #define IB_MGMT_METHOD_SEND			0x03
70 #define IB_MGMT_METHOD_TRAP			0x05
71 #define IB_MGMT_METHOD_REPORT			0x06
72 #define IB_MGMT_METHOD_REPORT_RESP		0x86
73 #define IB_MGMT_METHOD_TRAP_REPRESS		0x07
74 
75 #define IB_MGMT_METHOD_RESP			0x80
76 #define IB_BM_ATTR_MOD_RESP			cpu_to_be32(1)
77 
78 #define IB_MGMT_MAX_METHODS			128
79 
80 /* MAD Status field bit masks */
81 #define IB_MGMT_MAD_STATUS_SUCCESS			0x0000
82 #define IB_MGMT_MAD_STATUS_BUSY				0x0001
83 #define IB_MGMT_MAD_STATUS_REDIRECT_REQD		0x0002
84 #define IB_MGMT_MAD_STATUS_BAD_VERSION			0x0004
85 #define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD		0x0008
86 #define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB	0x000c
87 #define IB_MGMT_MAD_STATUS_INVALID_ATTRIB_VALUE		0x001c
88 
89 /* RMPP information */
90 #define IB_MGMT_RMPP_VERSION			1
91 
92 #define IB_MGMT_RMPP_TYPE_DATA			1
93 #define IB_MGMT_RMPP_TYPE_ACK			2
94 #define IB_MGMT_RMPP_TYPE_STOP			3
95 #define IB_MGMT_RMPP_TYPE_ABORT			4
96 
97 #define IB_MGMT_RMPP_FLAG_ACTIVE		1
98 #define IB_MGMT_RMPP_FLAG_FIRST			(1<<1)
99 #define IB_MGMT_RMPP_FLAG_LAST			(1<<2)
100 
101 #define IB_MGMT_RMPP_NO_RESPTIME		0x1F
102 
103 #define	IB_MGMT_RMPP_STATUS_SUCCESS		0
104 #define	IB_MGMT_RMPP_STATUS_RESX		1
105 #define	IB_MGMT_RMPP_STATUS_ABORT_MIN		118
106 #define	IB_MGMT_RMPP_STATUS_T2L			118
107 #define	IB_MGMT_RMPP_STATUS_BAD_LEN		119
108 #define	IB_MGMT_RMPP_STATUS_BAD_SEG		120
109 #define	IB_MGMT_RMPP_STATUS_BADT		121
110 #define	IB_MGMT_RMPP_STATUS_W2S			122
111 #define	IB_MGMT_RMPP_STATUS_S2B			123
112 #define	IB_MGMT_RMPP_STATUS_BAD_STATUS		124
113 #define	IB_MGMT_RMPP_STATUS_UNV			125
114 #define	IB_MGMT_RMPP_STATUS_TMR			126
115 #define	IB_MGMT_RMPP_STATUS_UNSPEC		127
116 #define	IB_MGMT_RMPP_STATUS_ABORT_MAX		127
117 
118 #define IB_QP0		0
119 #define IB_QP1		cpu_to_be32(1)
120 #define IB_QP1_QKEY	0x80010000
121 #define IB_QP_SET_QKEY	0x80000000
122 
123 #define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
124 #define IB_DEFAULT_PKEY_FULL	0xFFFF
125 
126 enum {
127 	IB_MGMT_MAD_HDR = 24,
128 	IB_MGMT_MAD_DATA = 232,
129 	IB_MGMT_RMPP_HDR = 36,
130 	IB_MGMT_RMPP_DATA = 220,
131 	IB_MGMT_VENDOR_HDR = 40,
132 	IB_MGMT_VENDOR_DATA = 216,
133 	IB_MGMT_SA_HDR = 56,
134 	IB_MGMT_SA_DATA = 200,
135 	IB_MGMT_DEVICE_HDR = 64,
136 	IB_MGMT_DEVICE_DATA = 192,
137 };
138 
139 struct ib_mad_hdr {
140 	u8	base_version;
141 	u8	mgmt_class;
142 	u8	class_version;
143 	u8	method;
144 	__be16	status;
145 	__be16	class_specific;
146 	__be64	tid;
147 	__be16	attr_id;
148 	__be16	resv;
149 	__be32	attr_mod;
150 };
151 
152 struct ib_rmpp_hdr {
153 	u8	rmpp_version;
154 	u8	rmpp_type;
155 	u8	rmpp_rtime_flags;
156 	u8	rmpp_status;
157 	__be32	seg_num;
158 	__be32	paylen_newwin;
159 };
160 
161 typedef u64 __bitwise ib_sa_comp_mask;
162 
163 #define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << n))
164 
165 /*
166  * ib_sa_hdr and ib_sa_mad structures must be packed because they have
167  * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
168  * lay them out wrong otherwise.  (And unfortunately they are sent on
169  * the wire so we can't change the layout)
170  */
171 struct ib_sa_hdr {
172 	__be64			sm_key;
173 	__be16			attr_offset;
174 	__be16			reserved;
175 	ib_sa_comp_mask		comp_mask;
176 } __attribute__ ((packed));
177 
178 struct ib_mad {
179 	struct ib_mad_hdr	mad_hdr;
180 	u8			data[IB_MGMT_MAD_DATA];
181 };
182 
183 struct ib_rmpp_mad {
184 	struct ib_mad_hdr	mad_hdr;
185 	struct ib_rmpp_hdr	rmpp_hdr;
186 	u8			data[IB_MGMT_RMPP_DATA];
187 };
188 
189 struct ib_sa_mad {
190 	struct ib_mad_hdr	mad_hdr;
191 	struct ib_rmpp_hdr	rmpp_hdr;
192 	struct ib_sa_hdr	sa_hdr;
193 	u8			data[IB_MGMT_SA_DATA];
194 } __attribute__ ((packed));
195 
196 struct ib_vendor_mad {
197 	struct ib_mad_hdr	mad_hdr;
198 	struct ib_rmpp_hdr	rmpp_hdr;
199 	u8			reserved;
200 	u8			oui[3];
201 	u8			data[IB_MGMT_VENDOR_DATA];
202 };
203 
204 struct ib_class_port_info {
205 	u8			base_version;
206 	u8			class_version;
207 	__be16			capability_mask;
208 	u8			reserved[3];
209 	u8			resp_time_value;
210 	u8			redirect_gid[16];
211 	__be32			redirect_tcslfl;
212 	__be16			redirect_lid;
213 	__be16			redirect_pkey;
214 	__be32			redirect_qp;
215 	__be32			redirect_qkey;
216 	u8			trap_gid[16];
217 	__be32			trap_tcslfl;
218 	__be16			trap_lid;
219 	__be16			trap_pkey;
220 	__be32			trap_hlqp;
221 	__be32			trap_qkey;
222 };
223 
224 /**
225  * ib_mad_send_buf - MAD data buffer and work request for sends.
226  * @next: A pointer used to chain together MADs for posting.
227  * @mad: References an allocated MAD data buffer for MADs that do not have
228  *   RMPP active.  For MADs using RMPP, references the common and management
229  *   class specific headers.
230  * @mad_agent: MAD agent that allocated the buffer.
231  * @ah: The address handle to use when sending the MAD.
232  * @context: User-controlled context fields.
233  * @hdr_len: Indicates the size of the data header of the MAD.  This length
234  *   includes the common MAD, RMPP, and class specific headers.
235  * @data_len: Indicates the total size of user-transferred data.
236  * @seg_count: The number of RMPP segments allocated for this send.
237  * @seg_size: Size of each RMPP segment.
238  * @timeout_ms: Time to wait for a response.
239  * @retries: Number of times to retry a request for a response.  For MADs
240  *   using RMPP, this applies per window.  On completion, returns the number
241  *   of retries needed to complete the transfer.
242  *
243  * Users are responsible for initializing the MAD buffer itself, with the
244  * exception of any RMPP header.  Additional segment buffer space allocated
245  * beyond data_len is padding.
246  */
247 struct ib_mad_send_buf {
248 	struct ib_mad_send_buf	*next;
249 	void			*mad;
250 	struct ib_mad_agent	*mad_agent;
251 	struct ib_ah		*ah;
252 	void			*context[2];
253 	int			hdr_len;
254 	int			data_len;
255 	int			seg_count;
256 	int			seg_size;
257 	int			timeout_ms;
258 	int			retries;
259 };
260 
261 /**
262  * ib_response_mad - Returns if the specified MAD has been generated in
263  *   response to a sent request or trap.
264  */
265 int ib_response_mad(struct ib_mad *mad);
266 
267 /**
268  * ib_get_rmpp_resptime - Returns the RMPP response time.
269  * @rmpp_hdr: An RMPP header.
270  */
ib_get_rmpp_resptime(struct ib_rmpp_hdr * rmpp_hdr)271 static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
272 {
273 	return rmpp_hdr->rmpp_rtime_flags >> 3;
274 }
275 
276 /**
277  * ib_get_rmpp_flags - Returns the RMPP flags.
278  * @rmpp_hdr: An RMPP header.
279  */
ib_get_rmpp_flags(struct ib_rmpp_hdr * rmpp_hdr)280 static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
281 {
282 	return rmpp_hdr->rmpp_rtime_flags & 0x7;
283 }
284 
285 /**
286  * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
287  * @rmpp_hdr: An RMPP header.
288  * @rtime: The response time to set.
289  */
ib_set_rmpp_resptime(struct ib_rmpp_hdr * rmpp_hdr,u8 rtime)290 static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
291 {
292 	rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
293 }
294 
295 /**
296  * ib_set_rmpp_flags - Sets the flags in an RMPP header.
297  * @rmpp_hdr: An RMPP header.
298  * @flags: The flags to set.
299  */
ib_set_rmpp_flags(struct ib_rmpp_hdr * rmpp_hdr,u8 flags)300 static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
301 {
302 	rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF8) |
303 				     (flags & 0x7);
304 }
305 
306 struct ib_mad_agent;
307 struct ib_mad_send_wc;
308 struct ib_mad_recv_wc;
309 
310 /**
311  * ib_mad_send_handler - callback handler for a sent MAD.
312  * @mad_agent: MAD agent that sent the MAD.
313  * @mad_send_wc: Send work completion information on the sent MAD.
314  */
315 typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
316 				    struct ib_mad_send_wc *mad_send_wc);
317 
318 /**
319  * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
320  * @mad_agent: MAD agent that snooped the MAD.
321  * @send_wr: Work request information on the sent MAD.
322  * @mad_send_wc: Work completion information on the sent MAD.  Valid
323  *   only for snooping that occurs on a send completion.
324  *
325  * Clients snooping MADs should not modify data referenced by the @send_wr
326  * or @mad_send_wc.
327  */
328 typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
329 				     struct ib_mad_send_buf *send_buf,
330 				     struct ib_mad_send_wc *mad_send_wc);
331 
332 /**
333  * ib_mad_recv_handler - callback handler for a received MAD.
334  * @mad_agent: MAD agent requesting the received MAD.
335  * @mad_recv_wc: Received work completion information on the received MAD.
336  *
337  * MADs received in response to a send request operation will be handed to
338  * the user before the send operation completes.  All data buffers given
339  * to registered agents through this routine are owned by the receiving
340  * client, except for snooping agents.  Clients snooping MADs should not
341  * modify the data referenced by @mad_recv_wc.
342  */
343 typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
344 				    struct ib_mad_recv_wc *mad_recv_wc);
345 
346 /**
347  * ib_mad_agent - Used to track MAD registration with the access layer.
348  * @device: Reference to device registration is on.
349  * @qp: Reference to QP used for sending and receiving MADs.
350  * @mr: Memory region for system memory usable for DMA.
351  * @recv_handler: Callback handler for a received MAD.
352  * @send_handler: Callback handler for a sent MAD.
353  * @snoop_handler: Callback handler for snooped sent MADs.
354  * @context: User-specified context associated with this registration.
355  * @hi_tid: Access layer assigned transaction ID for this client.
356  *   Unsolicited MADs sent by this client will have the upper 32-bits
357  *   of their TID set to this value.
358  * @port_num: Port number on which QP is registered
359  * @rmpp_version: If set, indicates the RMPP version used by this agent.
360  */
361 struct ib_mad_agent {
362 	struct ib_device	*device;
363 	struct ib_qp		*qp;
364 	struct ib_mr		*mr;
365 	ib_mad_recv_handler	recv_handler;
366 	ib_mad_send_handler	send_handler;
367 	ib_mad_snoop_handler	snoop_handler;
368 	void			*context;
369 	u32			hi_tid;
370 	u8			port_num;
371 	u8			rmpp_version;
372 };
373 
374 /**
375  * ib_mad_send_wc - MAD send completion information.
376  * @send_buf: Send MAD data buffer associated with the send MAD request.
377  * @status: Completion status.
378  * @vendor_err: Optional vendor error information returned with a failed
379  *   request.
380  */
381 struct ib_mad_send_wc {
382 	struct ib_mad_send_buf	*send_buf;
383 	enum ib_wc_status	status;
384 	u32			vendor_err;
385 };
386 
387 /**
388  * ib_mad_recv_buf - received MAD buffer information.
389  * @list: Reference to next data buffer for a received RMPP MAD.
390  * @grh: References a data buffer containing the global route header.
391  *   The data refereced by this buffer is only valid if the GRH is
392  *   valid.
393  * @mad: References the start of the received MAD.
394  */
395 struct ib_mad_recv_buf {
396 	struct list_head	list;
397 	struct ib_grh		*grh;
398 	struct ib_mad		*mad;
399 };
400 
401 /**
402  * ib_mad_recv_wc - received MAD information.
403  * @wc: Completion information for the received data.
404  * @recv_buf: Specifies the location of the received data buffer(s).
405  * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
406  * @mad_len: The length of the received MAD, without duplicated headers.
407  *
408  * For received response, the wr_id contains a pointer to the ib_mad_send_buf
409  *   for the corresponding send request.
410  */
411 struct ib_mad_recv_wc {
412 	struct ib_wc		*wc;
413 	struct ib_mad_recv_buf	recv_buf;
414 	struct list_head	rmpp_list;
415 	int			mad_len;
416 };
417 
418 /**
419  * ib_mad_reg_req - MAD registration request
420  * @mgmt_class: Indicates which management class of MADs should be receive
421  *   by the caller.  This field is only required if the user wishes to
422  *   receive unsolicited MADs, otherwise it should be 0.
423  * @mgmt_class_version: Indicates which version of MADs for the given
424  *   management class to receive.
425  * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
426  *   in the range from 0x30 to 0x4f. Otherwise not used.
427  * @method_mask: The caller will receive unsolicited MADs for any method
428  *   where @method_mask = 1.
429  */
430 struct ib_mad_reg_req {
431 	u8	mgmt_class;
432 	u8	mgmt_class_version;
433 	u8	oui[3];
434 	DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
435 };
436 
437 /**
438  * ib_register_mad_agent - Register to send/receive MADs.
439  * @device: The device to register with.
440  * @port_num: The port on the specified device to use.
441  * @qp_type: Specifies which QP to access.  Must be either
442  *   IB_QPT_SMI or IB_QPT_GSI.
443  * @mad_reg_req: Specifies which unsolicited MADs should be received
444  *   by the caller.  This parameter may be NULL if the caller only
445  *   wishes to receive solicited responses.
446  * @rmpp_version: If set, indicates that the client will send
447  *   and receive MADs that contain the RMPP header for the given version.
448  *   If set to 0, indicates that RMPP is not used by this client.
449  * @send_handler: The completion callback routine invoked after a send
450  *   request has completed.
451  * @recv_handler: The completion callback routine invoked for a received
452  *   MAD.
453  * @context: User specified context associated with the registration.
454  */
455 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
456 					   u8 port_num,
457 					   enum ib_qp_type qp_type,
458 					   struct ib_mad_reg_req *mad_reg_req,
459 					   u8 rmpp_version,
460 					   ib_mad_send_handler send_handler,
461 					   ib_mad_recv_handler recv_handler,
462 					   void *context);
463 
464 enum ib_mad_snoop_flags {
465 	/*IB_MAD_SNOOP_POSTED_SENDS	   = 1,*/
466 	/*IB_MAD_SNOOP_RMPP_SENDS	   = (1<<1),*/
467 	IB_MAD_SNOOP_SEND_COMPLETIONS	   = (1<<2),
468 	/*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
469 	IB_MAD_SNOOP_RECVS		   = (1<<4)
470 	/*IB_MAD_SNOOP_RMPP_RECVS	   = (1<<5),*/
471 	/*IB_MAD_SNOOP_REDIRECTED_QPS	   = (1<<6)*/
472 };
473 
474 /**
475  * ib_register_mad_snoop - Register to snoop sent and received MADs.
476  * @device: The device to register with.
477  * @port_num: The port on the specified device to use.
478  * @qp_type: Specifies which QP traffic to snoop.  Must be either
479  *   IB_QPT_SMI or IB_QPT_GSI.
480  * @mad_snoop_flags: Specifies information where snooping occurs.
481  * @send_handler: The callback routine invoked for a snooped send.
482  * @recv_handler: The callback routine invoked for a snooped receive.
483  * @context: User specified context associated with the registration.
484  */
485 struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
486 					   u8 port_num,
487 					   enum ib_qp_type qp_type,
488 					   int mad_snoop_flags,
489 					   ib_mad_snoop_handler snoop_handler,
490 					   ib_mad_recv_handler recv_handler,
491 					   void *context);
492 
493 /**
494  * ib_unregister_mad_agent - Unregisters a client from using MAD services.
495  * @mad_agent: Corresponding MAD registration request to deregister.
496  *
497  * After invoking this routine, MAD services are no longer usable by the
498  * client on the associated QP.
499  */
500 int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);
501 
502 /**
503  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
504  *   with the registered client.
505  * @send_buf: Specifies the information needed to send the MAD(s).
506  * @bad_send_buf: Specifies the MAD on which an error was encountered.  This
507  *   parameter is optional if only a single MAD is posted.
508  *
509  * Sent MADs are not guaranteed to complete in the order that they were posted.
510  *
511  * If the MAD requires RMPP, the data buffer should contain a single copy
512  * of the common MAD, RMPP, and class specific headers, followed by the class
513  * defined data.  If the class defined data would not divide evenly into
514  * RMPP segments, then space must be allocated at the end of the referenced
515  * buffer for any required padding.  To indicate the amount of class defined
516  * data being transferred, the paylen_newwin field in the RMPP header should
517  * be set to the size of the class specific header plus the amount of class
518  * defined data being transferred.  The paylen_newwin field should be
519  * specified in network-byte order.
520  */
521 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
522 		     struct ib_mad_send_buf **bad_send_buf);
523 
524 
525 /**
526  * ib_free_recv_mad - Returns data buffers used to receive a MAD.
527  * @mad_recv_wc: Work completion information for a received MAD.
528  *
529  * Clients receiving MADs through their ib_mad_recv_handler must call this
530  * routine to return the work completion buffers to the access layer.
531  */
532 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
533 
534 /**
535  * ib_cancel_mad - Cancels an outstanding send MAD operation.
536  * @mad_agent: Specifies the registration associated with sent MAD.
537  * @send_buf: Indicates the MAD to cancel.
538  *
539  * MADs will be returned to the user through the corresponding
540  * ib_mad_send_handler.
541  */
542 void ib_cancel_mad(struct ib_mad_agent *mad_agent,
543 		   struct ib_mad_send_buf *send_buf);
544 
545 /**
546  * ib_modify_mad - Modifies an outstanding send MAD operation.
547  * @mad_agent: Specifies the registration associated with sent MAD.
548  * @send_buf: Indicates the MAD to modify.
549  * @timeout_ms: New timeout value for sent MAD.
550  *
551  * This call will reset the timeout value for a sent MAD to the specified
552  * value.
553  */
554 int ib_modify_mad(struct ib_mad_agent *mad_agent,
555 		  struct ib_mad_send_buf *send_buf, u32 timeout_ms);
556 
557 /**
558  * ib_redirect_mad_qp - Registers a QP for MAD services.
559  * @qp: Reference to a QP that requires MAD services.
560  * @rmpp_version: If set, indicates that the client will send
561  *   and receive MADs that contain the RMPP header for the given version.
562  *   If set to 0, indicates that RMPP is not used by this client.
563  * @send_handler: The completion callback routine invoked after a send
564  *   request has completed.
565  * @recv_handler: The completion callback routine invoked for a received
566  *   MAD.
567  * @context: User specified context associated with the registration.
568  *
569  * Use of this call allows clients to use MAD services, such as RMPP,
570  * on user-owned QPs.  After calling this routine, users may send
571  * MADs on the specified QP by calling ib_mad_post_send.
572  */
573 struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
574 					u8 rmpp_version,
575 					ib_mad_send_handler send_handler,
576 					ib_mad_recv_handler recv_handler,
577 					void *context);
578 
579 /**
580  * ib_process_mad_wc - Processes a work completion associated with a
581  *   MAD sent or received on a redirected QP.
582  * @mad_agent: Specifies the registered MAD service using the redirected QP.
583  * @wc: References a work completion associated with a sent or received
584  *   MAD segment.
585  *
586  * This routine is used to complete or continue processing on a MAD request.
587  * If the work completion is associated with a send operation, calling
588  * this routine is required to continue an RMPP transfer or to wait for a
589  * corresponding response, if it is a request.  If the work completion is
590  * associated with a receive operation, calling this routine is required to
591  * process an inbound or outbound RMPP transfer, or to match a response MAD
592  * with its corresponding request.
593  */
594 int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
595 		      struct ib_wc *wc);
596 
597 /**
598  * ib_create_send_mad - Allocate and initialize a data buffer and work request
599  *   for sending a MAD.
600  * @mad_agent: Specifies the registered MAD service to associate with the MAD.
601  * @remote_qpn: Specifies the QPN of the receiving node.
602  * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
603  *   is valid only if the remote_qpn is QP 1.
604  * @rmpp_active: Indicates if the send will enable RMPP.
605  * @hdr_len: Indicates the size of the data header of the MAD.  This length
606  *   should include the common MAD header, RMPP header, plus any class
607  *   specific header.
608  * @data_len: Indicates the size of any user-transferred data.  The call will
609  *   automatically adjust the allocated buffer size to account for any
610  *   additional padding that may be necessary.
611  * @gfp_mask: GFP mask used for the memory allocation.
612  *
613  * This routine allocates a MAD for sending.  The returned MAD send buffer
614  * will reference a data buffer usable for sending a MAD, along
615  * with an initialized work request structure.  Users may modify the returned
616  * MAD data buffer before posting the send.
617  *
618  * The returned MAD header, class specific headers, and any padding will be
619  * cleared.  Users are responsible for initializing the common MAD header,
620  * any class specific header, and MAD data area.
621  * If @rmpp_active is set, the RMPP header will be initialized for sending.
622  */
623 struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
624 					   u32 remote_qpn, u16 pkey_index,
625 					   int rmpp_active,
626 					   int hdr_len, int data_len,
627 					   gfp_t gfp_mask);
628 
629 /**
630  * ib_is_mad_class_rmpp - returns whether given management class
631  * supports RMPP.
632  * @mgmt_class: management class
633  *
634  * This routine returns whether the management class supports RMPP.
635  */
636 int ib_is_mad_class_rmpp(u8 mgmt_class);
637 
638 /**
639  * ib_get_mad_data_offset - returns the data offset for a given
640  * management class.
641  * @mgmt_class: management class
642  *
643  * This routine returns the data offset in the MAD for the management
644  * class requested.
645  */
646 int ib_get_mad_data_offset(u8 mgmt_class);
647 
648 /**
649  * ib_get_rmpp_segment - returns the data buffer for a given RMPP segment.
650  * @send_buf: Previously allocated send data buffer.
651  * @seg_num: number of segment to return
652  *
653  * This routine returns a pointer to the data buffer of an RMPP MAD.
654  * Users must provide synchronization to @send_buf around this call.
655  */
656 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num);
657 
658 /**
659  * ib_free_send_mad - Returns data buffers used to send a MAD.
660  * @send_buf: Previously allocated send data buffer.
661  */
662 void ib_free_send_mad(struct ib_mad_send_buf *send_buf);
663 
664 #endif /* IB_MAD_H */
665