1 /*
2 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, 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 #include <linux/string.h>
35
36 #include <rdma/ib_pack.h>
37
value_read(int offset,int size,void * structure)38 static u64 value_read(int offset, int size, void *structure)
39 {
40 switch (size) {
41 case 1: return *(u8 *) (structure + offset);
42 case 2: return be16_to_cpup((__be16 *) (structure + offset));
43 case 4: return be32_to_cpup((__be32 *) (structure + offset));
44 case 8: return be64_to_cpup((__be64 *) (structure + offset));
45 default:
46 printk(KERN_WARNING "Field size %d bits not handled\n", size * 8);
47 return 0;
48 }
49 }
50
51 /**
52 * ib_pack - Pack a structure into a buffer
53 * @desc:Array of structure field descriptions
54 * @desc_len:Number of entries in @desc
55 * @structure:Structure to pack from
56 * @buf:Buffer to pack into
57 *
58 * ib_pack() packs a list of structure fields into a buffer,
59 * controlled by the array of fields in @desc.
60 */
ib_pack(const struct ib_field * desc,int desc_len,void * structure,void * buf)61 void ib_pack(const struct ib_field *desc,
62 int desc_len,
63 void *structure,
64 void *buf)
65 {
66 int i;
67
68 for (i = 0; i < desc_len; ++i) {
69 if (desc[i].size_bits <= 32) {
70 int shift;
71 u32 val;
72 __be32 mask;
73 __be32 *addr;
74
75 shift = 32 - desc[i].offset_bits - desc[i].size_bits;
76 if (desc[i].struct_size_bytes)
77 val = value_read(desc[i].struct_offset_bytes,
78 desc[i].struct_size_bytes,
79 structure) << shift;
80 else
81 val = 0;
82
83 mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift);
84 addr = (__be32 *) buf + desc[i].offset_words;
85 *addr = (*addr & ~mask) | (cpu_to_be32(val) & mask);
86 } else if (desc[i].size_bits <= 64) {
87 int shift;
88 u64 val;
89 __be64 mask;
90 __be64 *addr;
91
92 shift = 64 - desc[i].offset_bits - desc[i].size_bits;
93 if (desc[i].struct_size_bytes)
94 val = value_read(desc[i].struct_offset_bytes,
95 desc[i].struct_size_bytes,
96 structure) << shift;
97 else
98 val = 0;
99
100 mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift);
101 addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words);
102 *addr = (*addr & ~mask) | (cpu_to_be64(val) & mask);
103 } else {
104 if (desc[i].offset_bits % 8 ||
105 desc[i].size_bits % 8) {
106 printk(KERN_WARNING "Structure field %s of size %d "
107 "bits is not byte-aligned\n",
108 desc[i].field_name, desc[i].size_bits);
109 }
110
111 if (desc[i].struct_size_bytes)
112 memcpy(buf + desc[i].offset_words * 4 +
113 desc[i].offset_bits / 8,
114 structure + desc[i].struct_offset_bytes,
115 desc[i].size_bits / 8);
116 else
117 memset(buf + desc[i].offset_words * 4 +
118 desc[i].offset_bits / 8,
119 0,
120 desc[i].size_bits / 8);
121 }
122 }
123 }
124 EXPORT_SYMBOL(ib_pack);
125
value_write(int offset,int size,u64 val,void * structure)126 static void value_write(int offset, int size, u64 val, void *structure)
127 {
128 switch (size * 8) {
129 case 8: *( u8 *) (structure + offset) = val; break;
130 case 16: *(__be16 *) (structure + offset) = cpu_to_be16(val); break;
131 case 32: *(__be32 *) (structure + offset) = cpu_to_be32(val); break;
132 case 64: *(__be64 *) (structure + offset) = cpu_to_be64(val); break;
133 default:
134 printk(KERN_WARNING "Field size %d bits not handled\n", size * 8);
135 }
136 }
137
138 /**
139 * ib_unpack - Unpack a buffer into a structure
140 * @desc:Array of structure field descriptions
141 * @desc_len:Number of entries in @desc
142 * @buf:Buffer to unpack from
143 * @structure:Structure to unpack into
144 *
145 * ib_pack() unpacks a list of structure fields from a buffer,
146 * controlled by the array of fields in @desc.
147 */
ib_unpack(const struct ib_field * desc,int desc_len,void * buf,void * structure)148 void ib_unpack(const struct ib_field *desc,
149 int desc_len,
150 void *buf,
151 void *structure)
152 {
153 int i;
154
155 for (i = 0; i < desc_len; ++i) {
156 if (!desc[i].struct_size_bytes)
157 continue;
158
159 if (desc[i].size_bits <= 32) {
160 int shift;
161 u32 val;
162 u32 mask;
163 __be32 *addr;
164
165 shift = 32 - desc[i].offset_bits - desc[i].size_bits;
166 mask = ((1ull << desc[i].size_bits) - 1) << shift;
167 addr = (__be32 *) buf + desc[i].offset_words;
168 val = (be32_to_cpup(addr) & mask) >> shift;
169 value_write(desc[i].struct_offset_bytes,
170 desc[i].struct_size_bytes,
171 val,
172 structure);
173 } else if (desc[i].size_bits <= 64) {
174 int shift;
175 u64 val;
176 u64 mask;
177 __be64 *addr;
178
179 shift = 64 - desc[i].offset_bits - desc[i].size_bits;
180 mask = (~0ull >> (64 - desc[i].size_bits)) << shift;
181 addr = (__be64 *) buf + desc[i].offset_words;
182 val = (be64_to_cpup(addr) & mask) >> shift;
183 value_write(desc[i].struct_offset_bytes,
184 desc[i].struct_size_bytes,
185 val,
186 structure);
187 } else {
188 if (desc[i].offset_bits % 8 ||
189 desc[i].size_bits % 8) {
190 printk(KERN_WARNING "Structure field %s of size %d "
191 "bits is not byte-aligned\n",
192 desc[i].field_name, desc[i].size_bits);
193 }
194
195 memcpy(structure + desc[i].struct_offset_bytes,
196 buf + desc[i].offset_words * 4 +
197 desc[i].offset_bits / 8,
198 desc[i].size_bits / 8);
199 }
200 }
201 }
202 EXPORT_SYMBOL(ib_unpack);
203