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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | /* * Copyright (c) 2004 Topspin Corporation. All rights reserved. * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include <linux/export.h> #include <linux/string.h> #include <rdma/ib_pack.h> static u64 value_read(int offset, int size, void *structure) { switch (size) { case 1: return *(u8 *) (structure + offset); case 2: return be16_to_cpup((__be16 *) (structure + offset)); case 4: return be32_to_cpup((__be32 *) (structure + offset)); case 8: return be64_to_cpup((__be64 *) (structure + offset)); default: printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); return 0; } } /** * ib_pack - Pack a structure into a buffer * @desc:Array of structure field descriptions * @desc_len:Number of entries in @desc * @structure:Structure to pack from * @buf:Buffer to pack into * * ib_pack() packs a list of structure fields into a buffer, * controlled by the array of fields in @desc. */ void ib_pack(const struct ib_field *desc, int desc_len, void *structure, void *buf) { int i; for (i = 0; i < desc_len; ++i) { if (desc[i].size_bits <= 32) { int shift; u32 val; __be32 mask; __be32 *addr; shift = 32 - desc[i].offset_bits - desc[i].size_bits; if (desc[i].struct_size_bytes) val = value_read(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, structure) << shift; else val = 0; mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift); addr = (__be32 *) buf + desc[i].offset_words; *addr = (*addr & ~mask) | (cpu_to_be32(val) & mask); } else if (desc[i].size_bits <= 64) { int shift; u64 val; __be64 mask; __be64 *addr; shift = 64 - desc[i].offset_bits - desc[i].size_bits; if (desc[i].struct_size_bytes) val = value_read(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, structure) << shift; else val = 0; mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift); addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words); *addr = (*addr & ~mask) | (cpu_to_be64(val) & mask); } else { if (desc[i].offset_bits % 8 || desc[i].size_bits % 8) { printk(KERN_WARNING "Structure field %s of size %d " "bits is not byte-aligned\n", desc[i].field_name, desc[i].size_bits); } if (desc[i].struct_size_bytes) memcpy(buf + desc[i].offset_words * 4 + desc[i].offset_bits / 8, structure + desc[i].struct_offset_bytes, desc[i].size_bits / 8); else memset(buf + desc[i].offset_words * 4 + desc[i].offset_bits / 8, 0, desc[i].size_bits / 8); } } } EXPORT_SYMBOL(ib_pack); static void value_write(int offset, int size, u64 val, void *structure) { switch (size * 8) { case 8: *( u8 *) (structure + offset) = val; break; case 16: *(__be16 *) (structure + offset) = cpu_to_be16(val); break; case 32: *(__be32 *) (structure + offset) = cpu_to_be32(val); break; case 64: *(__be64 *) (structure + offset) = cpu_to_be64(val); break; default: printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); } } /** * ib_unpack - Unpack a buffer into a structure * @desc:Array of structure field descriptions * @desc_len:Number of entries in @desc * @buf:Buffer to unpack from * @structure:Structure to unpack into * * ib_pack() unpacks a list of structure fields from a buffer, * controlled by the array of fields in @desc. */ void ib_unpack(const struct ib_field *desc, int desc_len, void *buf, void *structure) { int i; for (i = 0; i < desc_len; ++i) { if (!desc[i].struct_size_bytes) continue; if (desc[i].size_bits <= 32) { int shift; u32 val; u32 mask; __be32 *addr; shift = 32 - desc[i].offset_bits - desc[i].size_bits; mask = ((1ull << desc[i].size_bits) - 1) << shift; addr = (__be32 *) buf + desc[i].offset_words; val = (be32_to_cpup(addr) & mask) >> shift; value_write(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, val, structure); } else if (desc[i].size_bits <= 64) { int shift; u64 val; u64 mask; __be64 *addr; shift = 64 - desc[i].offset_bits - desc[i].size_bits; mask = (~0ull >> (64 - desc[i].size_bits)) << shift; addr = (__be64 *) buf + desc[i].offset_words; val = (be64_to_cpup(addr) & mask) >> shift; value_write(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, val, structure); } else { if (desc[i].offset_bits % 8 || desc[i].size_bits % 8) { printk(KERN_WARNING "Structure field %s of size %d " "bits is not byte-aligned\n", desc[i].field_name, desc[i].size_bits); } memcpy(structure + desc[i].struct_offset_bytes, buf + desc[i].offset_words * 4 + desc[i].offset_bits / 8, desc[i].size_bits / 8); } } } EXPORT_SYMBOL(ib_unpack); |