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/export.h> 35 #include <linux/string.h> 36 37 #include <rdma/ib_pack.h> 38 39 static u64 value_read(int offset, int size, void *structure) 40 { 41 switch (size) { 42 case 1: return *(u8 *) (structure + offset); 43 case 2: return be16_to_cpup((__be16 *) (structure + offset)); 44 case 4: return be32_to_cpup((__be32 *) (structure + offset)); 45 case 8: return be64_to_cpup((__be64 *) (structure + offset)); 46 default: 47 printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); 48 return 0; 49 } 50 } 51 52 /** 53 * ib_pack - Pack a structure into a buffer 54 * @desc:Array of structure field descriptions 55 * @desc_len:Number of entries in @desc 56 * @structure:Structure to pack from 57 * @buf:Buffer to pack into 58 * 59 * ib_pack() packs a list of structure fields into a buffer, 60 * controlled by the array of fields in @desc. 61 */ 62 void ib_pack(const struct ib_field *desc, 63 int desc_len, 64 void *structure, 65 void *buf) 66 { 67 int i; 68 69 for (i = 0; i < desc_len; ++i) { 70 if (desc[i].size_bits <= 32) { 71 int shift; 72 u32 val; 73 __be32 mask; 74 __be32 *addr; 75 76 shift = 32 - desc[i].offset_bits - desc[i].size_bits; 77 if (desc[i].struct_size_bytes) 78 val = value_read(desc[i].struct_offset_bytes, 79 desc[i].struct_size_bytes, 80 structure) << shift; 81 else 82 val = 0; 83 84 mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift); 85 addr = (__be32 *) buf + desc[i].offset_words; 86 *addr = (*addr & ~mask) | (cpu_to_be32(val) & mask); 87 } else if (desc[i].size_bits <= 64) { 88 int shift; 89 u64 val; 90 __be64 mask; 91 __be64 *addr; 92 93 shift = 64 - desc[i].offset_bits - desc[i].size_bits; 94 if (desc[i].struct_size_bytes) 95 val = value_read(desc[i].struct_offset_bytes, 96 desc[i].struct_size_bytes, 97 structure) << shift; 98 else 99 val = 0; 100 101 mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift); 102 addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words); 103 *addr = (*addr & ~mask) | (cpu_to_be64(val) & mask); 104 } else { 105 if (desc[i].offset_bits % 8 || 106 desc[i].size_bits % 8) { 107 printk(KERN_WARNING "Structure field %s of size %d " 108 "bits is not byte-aligned\n", 109 desc[i].field_name, desc[i].size_bits); 110 } 111 112 if (desc[i].struct_size_bytes) 113 memcpy(buf + desc[i].offset_words * 4 + 114 desc[i].offset_bits / 8, 115 structure + desc[i].struct_offset_bytes, 116 desc[i].size_bits / 8); 117 else 118 memset(buf + desc[i].offset_words * 4 + 119 desc[i].offset_bits / 8, 120 0, 121 desc[i].size_bits / 8); 122 } 123 } 124 } 125 EXPORT_SYMBOL(ib_pack); 126 127 static void value_write(int offset, int size, u64 val, void *structure) 128 { 129 switch (size * 8) { 130 case 8: *( u8 *) (structure + offset) = val; break; 131 case 16: *(__be16 *) (structure + offset) = cpu_to_be16(val); break; 132 case 32: *(__be32 *) (structure + offset) = cpu_to_be32(val); break; 133 case 64: *(__be64 *) (structure + offset) = cpu_to_be64(val); break; 134 default: 135 printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); 136 } 137 } 138 139 /** 140 * ib_unpack - Unpack a buffer into a structure 141 * @desc:Array of structure field descriptions 142 * @desc_len:Number of entries in @desc 143 * @buf:Buffer to unpack from 144 * @structure:Structure to unpack into 145 * 146 * ib_pack() unpacks a list of structure fields from a buffer, 147 * controlled by the array of fields in @desc. 148 */ 149 void ib_unpack(const struct ib_field *desc, 150 int desc_len, 151 void *buf, 152 void *structure) 153 { 154 int i; 155 156 for (i = 0; i < desc_len; ++i) { 157 if (!desc[i].struct_size_bytes) 158 continue; 159 160 if (desc[i].size_bits <= 32) { 161 int shift; 162 u32 val; 163 u32 mask; 164 __be32 *addr; 165 166 shift = 32 - desc[i].offset_bits - desc[i].size_bits; 167 mask = ((1ull << desc[i].size_bits) - 1) << shift; 168 addr = (__be32 *) buf + desc[i].offset_words; 169 val = (be32_to_cpup(addr) & mask) >> shift; 170 value_write(desc[i].struct_offset_bytes, 171 desc[i].struct_size_bytes, 172 val, 173 structure); 174 } else if (desc[i].size_bits <= 64) { 175 int shift; 176 u64 val; 177 u64 mask; 178 __be64 *addr; 179 180 shift = 64 - desc[i].offset_bits - desc[i].size_bits; 181 mask = (~0ull >> (64 - desc[i].size_bits)) << shift; 182 addr = (__be64 *) buf + desc[i].offset_words; 183 val = (be64_to_cpup(addr) & mask) >> shift; 184 value_write(desc[i].struct_offset_bytes, 185 desc[i].struct_size_bytes, 186 val, 187 structure); 188 } else { 189 if (desc[i].offset_bits % 8 || 190 desc[i].size_bits % 8) { 191 printk(KERN_WARNING "Structure field %s of size %d " 192 "bits is not byte-aligned\n", 193 desc[i].field_name, desc[i].size_bits); 194 } 195 196 memcpy(structure + desc[i].struct_offset_bytes, 197 buf + desc[i].offset_words * 4 + 198 desc[i].offset_bits / 8, 199 desc[i].size_bits / 8); 200 } 201 } 202 } 203 EXPORT_SYMBOL(ib_unpack); 204