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 * $Id: packer.c,v 1.1.1.1 2007/10/11 23:31:50 Exp $ 34 */ 35 36#include <linux/string.h> 37 38#include <rdma/ib_pack.h> 39 40static u64 value_read(int offset, int size, void *structure) 41{ 42 switch (size) { 43 case 1: return *(u8 *) (structure + offset); 44 case 2: return be16_to_cpup((__be16 *) (structure + offset)); 45 case 4: return be32_to_cpup((__be32 *) (structure + offset)); 46 case 8: return be64_to_cpup((__be64 *) (structure + offset)); 47 default: 48 printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); 49 return 0; 50 } 51} 52 53/** 54 * ib_pack - Pack a structure into a buffer 55 * @desc:Array of structure field descriptions 56 * @desc_len:Number of entries in @desc 57 * @structure:Structure to pack from 58 * @buf:Buffer to pack into 59 * 60 * ib_pack() packs a list of structure fields into a buffer, 61 * controlled by the array of fields in @desc. 62 */ 63void ib_pack(const struct ib_field *desc, 64 int desc_len, 65 void *structure, 66 void *buf) 67{ 68 int i; 69 70 for (i = 0; i < desc_len; ++i) { 71 if (desc[i].size_bits <= 32) { 72 int shift; 73 u32 val; 74 __be32 mask; 75 __be32 *addr; 76 77 shift = 32 - desc[i].offset_bits - desc[i].size_bits; 78 if (desc[i].struct_size_bytes) 79 val = value_read(desc[i].struct_offset_bytes, 80 desc[i].struct_size_bytes, 81 structure) << shift; 82 else 83 val = 0; 84 85 mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift); 86 addr = (__be32 *) buf + desc[i].offset_words; 87 *addr = (*addr & ~mask) | (cpu_to_be32(val) & mask); 88 } else if (desc[i].size_bits <= 64) { 89 int shift; 90 u64 val; 91 __be64 mask; 92 __be64 *addr; 93 94 shift = 64 - desc[i].offset_bits - desc[i].size_bits; 95 if (desc[i].struct_size_bytes) 96 val = value_read(desc[i].struct_offset_bytes, 97 desc[i].struct_size_bytes, 98 structure) << shift; 99 else 100 val = 0; 101 102 mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift); 103 addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words); 104 *addr = (*addr & ~mask) | (cpu_to_be64(val) & mask); 105 } else { 106 if (desc[i].offset_bits % 8 || 107 desc[i].size_bits % 8) { 108 printk(KERN_WARNING "Structure field %s of size %d " 109 "bits is not byte-aligned\n", 110 desc[i].field_name, desc[i].size_bits); 111 } 112 113 if (desc[i].struct_size_bytes) 114 memcpy(buf + desc[i].offset_words * 4 + 115 desc[i].offset_bits / 8, 116 structure + desc[i].struct_offset_bytes, 117 desc[i].size_bits / 8); 118 else 119 memset(buf + desc[i].offset_words * 4 + 120 desc[i].offset_bits / 8, 121 0, 122 desc[i].size_bits / 8); 123 } 124 } 125} 126EXPORT_SYMBOL(ib_pack); 127 128static void value_write(int offset, int size, u64 val, void *structure) 129{ 130 switch (size * 8) { 131 case 8: *( u8 *) (structure + offset) = val; break; 132 case 16: *(__be16 *) (structure + offset) = cpu_to_be16(val); break; 133 case 32: *(__be32 *) (structure + offset) = cpu_to_be32(val); break; 134 case 64: *(__be64 *) (structure + offset) = cpu_to_be64(val); break; 135 default: 136 printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); 137 } 138} 139 140/** 141 * ib_unpack - Unpack a buffer into a structure 142 * @desc:Array of structure field descriptions 143 * @desc_len:Number of entries in @desc 144 * @buf:Buffer to unpack from 145 * @structure:Structure to unpack into 146 * 147 * ib_pack() unpacks a list of structure fields from a buffer, 148 * controlled by the array of fields in @desc. 149 */ 150void ib_unpack(const struct ib_field *desc, 151 int desc_len, 152 void *buf, 153 void *structure) 154{ 155 int i; 156 157 for (i = 0; i < desc_len; ++i) { 158 if (!desc[i].struct_size_bytes) 159 continue; 160 161 if (desc[i].size_bits <= 32) { 162 int shift; 163 u32 val; 164 u32 mask; 165 __be32 *addr; 166 167 shift = 32 - desc[i].offset_bits - desc[i].size_bits; 168 mask = ((1ull << desc[i].size_bits) - 1) << shift; 169 addr = (__be32 *) buf + desc[i].offset_words; 170 val = (be32_to_cpup(addr) & mask) >> shift; 171 value_write(desc[i].struct_offset_bytes, 172 desc[i].struct_size_bytes, 173 val, 174 structure); 175 } else if (desc[i].size_bits <= 64) { 176 int shift; 177 u64 val; 178 u64 mask; 179 __be64 *addr; 180 181 shift = 64 - desc[i].offset_bits - desc[i].size_bits; 182 mask = (~0ull >> (64 - desc[i].size_bits)) << shift; 183 addr = (__be64 *) buf + desc[i].offset_words; 184 val = (be64_to_cpup(addr) & mask) >> shift; 185 value_write(desc[i].struct_offset_bytes, 186 desc[i].struct_size_bytes, 187 val, 188 structure); 189 } else { 190 if (desc[i].offset_bits % 8 || 191 desc[i].size_bits % 8) { 192 printk(KERN_WARNING "Structure field %s of size %d " 193 "bits is not byte-aligned\n", 194 desc[i].field_name, desc[i].size_bits); 195 } 196 197 memcpy(structure + desc[i].struct_offset_bytes, 198 buf + desc[i].offset_words * 4 + 199 desc[i].offset_bits / 8, 200 desc[i].size_bits / 8); 201 } 202 } 203} 204EXPORT_SYMBOL(ib_unpack); 205