1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright (c) 2004 Topspin 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
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include <linux/string.h>
40
41 #include <rdma/ib_pack.h>
42
43 static u64 value_read(int offset, int size, void *structure)
44 {
45 switch (size) {
46 case 1: return *(u8 *) ((char *)structure + offset);
47 case 2: return be16_to_cpup((__be16 *) ((char *)structure + offset));
48 case 4: return be32_to_cpup((__be32 *) ((char *)structure + offset));
49 case 8: return be64_to_cpup((__be64 *) ((char *)structure + offset));
50 default:
51 pr_warn("Field size %d bits not handled\n", size * 8);
52 return 0;
53 }
54 }
55
56 /**
57 * ib_pack - Pack a structure into a buffer
58 * @desc:Array of structure field descriptions
59 * @desc_len:Number of entries in @desc
60 * @structure:Structure to pack from
61 * @buf:Buffer to pack into
62 *
63 * ib_pack() packs a list of structure fields into a buffer,
64 * controlled by the array of fields in @desc.
65 */
66 void ib_pack(const struct ib_field *desc,
67 int desc_len,
68 void *structure,
69 void *buf)
70 {
71 int i;
72
73 for (i = 0; i < desc_len; ++i) {
74 if (desc[i].size_bits <= 32) {
75 int shift;
76 u32 val;
77 __be32 mask;
78 __be32 *addr;
79
80 shift = 32 - desc[i].offset_bits - desc[i].size_bits;
81 if (desc[i].struct_size_bytes)
82 val = value_read(desc[i].struct_offset_bytes,
83 desc[i].struct_size_bytes,
84 structure) << shift;
85 else
86 val = 0;
87
88 mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift);
89 addr = (__be32 *) buf + desc[i].offset_words;
90 *addr = (*addr & ~mask) | (cpu_to_be32(val) & mask);
91 } else if (desc[i].size_bits <= 64) {
92 int shift;
93 u64 val;
94 __be64 mask;
95 __be64 *addr;
96
97 shift = 64 - desc[i].offset_bits - desc[i].size_bits;
98 if (desc[i].struct_size_bytes)
99 val = value_read(desc[i].struct_offset_bytes,
100 desc[i].struct_size_bytes,
101 structure) << shift;
102 else
103 val = 0;
104
105 mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift);
106 addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words);
107 *addr = (*addr & ~mask) | (cpu_to_be64(val) & mask);
108 } else {
109 if (desc[i].offset_bits % 8 ||
110 desc[i].size_bits % 8) {
111 pr_warn("Structure field %s of size %d bits is not byte-aligned\n",
112 desc[i].field_name, desc[i].size_bits);
113 }
114
115 if (desc[i].struct_size_bytes)
116 memcpy((char *)buf + desc[i].offset_words * 4 +
117 desc[i].offset_bits / 8,
118 (char *)structure + desc[i].struct_offset_bytes,
119 desc[i].size_bits / 8);
120 else
121 memset((char *)buf + desc[i].offset_words * 4 +
122 desc[i].offset_bits / 8,
123 0,
124 desc[i].size_bits / 8);
125 }
126 }
127 }
128 EXPORT_SYMBOL(ib_pack);
129
130 static void value_write(int offset, int size, u64 val, void *structure)
131 {
132 switch (size * 8) {
133 case 8: *( u8 *) ((char *)structure + offset) = val; break;
134 case 16: *(__be16 *) ((char *)structure + offset) = cpu_to_be16(val); break;
135 case 32: *(__be32 *) ((char *)structure + offset) = cpu_to_be32(val); break;
136 case 64: *(__be64 *) ((char *)structure + offset) = cpu_to_be64(val); break;
137 default:
138 pr_warn("Field size %d bits not handled\n", size * 8);
139 }
140 }
141
142 /**
143 * ib_unpack - Unpack a buffer into a structure
144 * @desc:Array of structure field descriptions
145 * @desc_len:Number of entries in @desc
146 * @buf:Buffer to unpack from
147 * @structure:Structure to unpack into
148 *
149 * ib_pack() unpacks a list of structure fields from a buffer,
150 * controlled by the array of fields in @desc.
151 */
152 void ib_unpack(const struct ib_field *desc,
153 int desc_len,
154 void *buf,
155 void *structure)
156 {
157 int i;
158
159 for (i = 0; i < desc_len; ++i) {
160 if (!desc[i].struct_size_bytes)
161 continue;
162
163 if (desc[i].size_bits <= 32) {
164 int shift;
165 u32 val;
166 u32 mask;
167 __be32 *addr;
168
169 shift = 32 - desc[i].offset_bits - desc[i].size_bits;
170 mask = ((1ull << desc[i].size_bits) - 1) << shift;
171 addr = (__be32 *) buf + desc[i].offset_words;
172 val = (be32_to_cpup(addr) & mask) >> shift;
173 value_write(desc[i].struct_offset_bytes,
174 desc[i].struct_size_bytes,
175 val,
176 structure);
177 } else if (desc[i].size_bits <= 64) {
178 int shift;
179 u64 val;
180 u64 mask;
181 __be64 *addr;
182
183 shift = 64 - desc[i].offset_bits - desc[i].size_bits;
184 mask = (~0ull >> (64 - desc[i].size_bits)) << shift;
185 addr = (__be64 *) buf + desc[i].offset_words;
186 val = (be64_to_cpup(addr) & mask) >> shift;
187 value_write(desc[i].struct_offset_bytes,
188 desc[i].struct_size_bytes,
189 val,
190 structure);
191 } else {
192 if (desc[i].offset_bits % 8 ||
193 desc[i].size_bits % 8) {
194 pr_warn("Structure field %s of size %d bits is not byte-aligned\n",
195 desc[i].field_name, desc[i].size_bits);
196 }
197
198 memcpy((char *)structure + desc[i].struct_offset_bytes,
199 (char *)buf + desc[i].offset_words * 4 +
200 desc[i].offset_bits / 8,
201 desc[i].size_bits / 8);
202 }
203 }
204 }
205 EXPORT_SYMBOL(ib_unpack);
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