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1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Voltaire, Inc. 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 #ifndef IB_USER_MAD_H
35 #define IB_USER_MAD_H
36 
37 #include <linux/types.h>
38 #include <linux/ioctl.h>
39 
40 /*
41  * Increment this value if any changes that break userspace ABI
42  * compatibility are made.
43  */
44 #define IB_USER_MAD_ABI_VERSION	5
45 
46 /*
47  * Make sure that all structs defined in this file remain laid out so
48  * that they pack the same way on 32-bit and 64-bit architectures (to
49  * avoid incompatibility between 32-bit userspace and 64-bit kernels).
50  */
51 
52 /**
53  * ib_user_mad_hdr_old - Old version of MAD packet header without pkey_index
54  * @id - ID of agent MAD received with/to be sent with
55  * @status - 0 on successful receive, ETIMEDOUT if no response
56  *   received (transaction ID in data[] will be set to TID of original
57  *   request) (ignored on send)
58  * @timeout_ms - Milliseconds to wait for response (unset on receive)
59  * @retries - Number of automatic retries to attempt
60  * @qpn - Remote QP number received from/to be sent to
61  * @qkey - Remote Q_Key to be sent with (unset on receive)
62  * @lid - Remote lid received from/to be sent to
63  * @sl - Service level received with/to be sent with
64  * @path_bits - Local path bits received with/to be sent with
65  * @grh_present - If set, GRH was received/should be sent
66  * @gid_index - Local GID index to send with (unset on receive)
67  * @hop_limit - Hop limit in GRH
68  * @traffic_class - Traffic class in GRH
69  * @gid - Remote GID in GRH
70  * @flow_label - Flow label in GRH
71  */
72 struct ib_user_mad_hdr_old {
73 	__u32	id;
74 	__u32	status;
75 	__u32	timeout_ms;
76 	__u32	retries;
77 	__u32	length;
78 	__be32	qpn;
79 	__be32  qkey;
80 	__be16	lid;
81 	__u8	sl;
82 	__u8	path_bits;
83 	__u8	grh_present;
84 	__u8	gid_index;
85 	__u8	hop_limit;
86 	__u8	traffic_class;
87 	__u8	gid[16];
88 	__be32	flow_label;
89 };
90 
91 /**
92  * ib_user_mad_hdr - MAD packet header
93  *   This layout allows specifying/receiving the P_Key index.  To use
94  *   this capability, an application must call the
95  *   IB_USER_MAD_ENABLE_PKEY ioctl on the user MAD file handle before
96  *   any other actions with the file handle.
97  * @id - ID of agent MAD received with/to be sent with
98  * @status - 0 on successful receive, ETIMEDOUT if no response
99  *   received (transaction ID in data[] will be set to TID of original
100  *   request) (ignored on send)
101  * @timeout_ms - Milliseconds to wait for response (unset on receive)
102  * @retries - Number of automatic retries to attempt
103  * @qpn - Remote QP number received from/to be sent to
104  * @qkey - Remote Q_Key to be sent with (unset on receive)
105  * @lid - Remote lid received from/to be sent to
106  * @sl - Service level received with/to be sent with
107  * @path_bits - Local path bits received with/to be sent with
108  * @grh_present - If set, GRH was received/should be sent
109  * @gid_index - Local GID index to send with (unset on receive)
110  * @hop_limit - Hop limit in GRH
111  * @traffic_class - Traffic class in GRH
112  * @gid - Remote GID in GRH
113  * @flow_label - Flow label in GRH
114  * @pkey_index - P_Key index
115  */
116 struct ib_user_mad_hdr {
117 	__u32	id;
118 	__u32	status;
119 	__u32	timeout_ms;
120 	__u32	retries;
121 	__u32	length;
122 	__be32	qpn;
123 	__be32  qkey;
124 	__be16	lid;
125 	__u8	sl;
126 	__u8	path_bits;
127 	__u8	grh_present;
128 	__u8	gid_index;
129 	__u8	hop_limit;
130 	__u8	traffic_class;
131 	__u8	gid[16];
132 	__be32	flow_label;
133 	__u16	pkey_index;
134 	__u8	reserved[6];
135 };
136 
137 /**
138  * ib_user_mad - MAD packet
139  * @hdr - MAD packet header
140  * @data - Contents of MAD
141  *
142  */
143 struct ib_user_mad {
144 	struct ib_user_mad_hdr hdr;
145 	__u64	data[0];
146 };
147 
148 /*
149  * Earlier versions of this interface definition declared the
150  * method_mask[] member as an array of __u32 but treated it as a
151  * bitmap made up of longs in the kernel.  This ambiguity meant that
152  * 32-bit big-endian applications that can run on both 32-bit and
153  * 64-bit kernels had no consistent ABI to rely on, and 64-bit
154  * big-endian applications that treated method_mask as being made up
155  * of 32-bit words would have their bitmap misinterpreted.
156  *
157  * To clear up this confusion, we change the declaration of
158  * method_mask[] to use unsigned long and handle the conversion from
159  * 32-bit userspace to 64-bit kernel for big-endian systems in the
160  * compat_ioctl method.  Unfortunately, to keep the structure layout
161  * the same, we need the method_mask[] array to be aligned only to 4
162  * bytes even when long is 64 bits, which forces us into this ugly
163  * typedef.
164  */
165 typedef unsigned long __attribute__((aligned(4))) packed_ulong;
166 #define IB_USER_MAD_LONGS_PER_METHOD_MASK (128 / (8 * sizeof (long)))
167 
168 /**
169  * ib_user_mad_reg_req - MAD registration request
170  * @id - Set by the kernel; used to identify agent in future requests.
171  * @qpn - Queue pair number; must be 0 or 1.
172  * @method_mask - The caller will receive unsolicited MADs for any method
173  *   where @method_mask = 1.
174  * @mgmt_class - Indicates which management class of MADs should be receive
175  *   by the caller.  This field is only required if the user wishes to
176  *   receive unsolicited MADs, otherwise it should be 0.
177  * @mgmt_class_version - Indicates which version of MADs for the given
178  *   management class to receive.
179  * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
180  *   in the range from 0x30 to 0x4f. Otherwise not used.
181  * @rmpp_version: If set, indicates the RMPP version used.
182  *
183  */
184 struct ib_user_mad_reg_req {
185 	__u32	id;
186 	packed_ulong method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK];
187 	__u8	qpn;
188 	__u8	mgmt_class;
189 	__u8	mgmt_class_version;
190 	__u8    oui[3];
191 	__u8	rmpp_version;
192 };
193 
194 #define IB_IOCTL_MAGIC		0x1b
195 
196 #define IB_USER_MAD_REGISTER_AGENT	_IOWR(IB_IOCTL_MAGIC, 1, \
197 					      struct ib_user_mad_reg_req)
198 
199 #define IB_USER_MAD_UNREGISTER_AGENT	_IOW(IB_IOCTL_MAGIC, 2, __u32)
200 
201 #define IB_USER_MAD_ENABLE_PKEY		_IO(IB_IOCTL_MAGIC, 3)
202 
203 #endif /* IB_USER_MAD_H */
204