Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2004 Topspin Corporation. All rights reserved. |
Roland Dreier | 2a1d9b7 | 2005-08-10 23:03:10 -0700 | [diff] [blame] | 3 | * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * $Id: packer.c 1349 2004-12-16 21:09:43Z roland $ |
| 34 | */ |
| 35 | |
Roland Dreier | a4d61e8 | 2005-08-25 13:40:04 -0700 | [diff] [blame^] | 36 | #include <rdma/ib_pack.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 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 | */ |
| 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 | |
Roland Dreier | 4844296 | 2005-06-27 14:36:47 -0700 | [diff] [blame] | 100 | mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 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 | */ |
| 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; |
Roland Dreier | 4844296 | 2005-06-27 14:36:47 -0700 | [diff] [blame] | 180 | mask = (~0ull >> (64 - desc[i].size_bits)) << shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |