1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "spdk/crc32.h" 35 36 #ifdef SPDK_CONFIG_ISAL 37 #define SPDK_HAVE_ISAL 38 #include <isa-l/include/crc.h> 39 #elif defined(__aarch64__) && defined(__ARM_FEATURE_CRC32) 40 #define SPDK_HAVE_ARM_CRC 41 #include <arm_acle.h> 42 #elif defined(__x86_64__) && defined(__SSE4_2__) 43 #define SPDK_HAVE_SSE4_2 44 #include <x86intrin.h> 45 #endif 46 47 #ifdef SPDK_HAVE_ISAL 48 49 uint32_t 50 spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) 51 { 52 return crc32_iscsi((unsigned char *)buf, len, crc); 53 } 54 55 #elif defined(SPDK_HAVE_SSE4_2) 56 57 uint32_t 58 spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) 59 { 60 uint64_t crc_tmp64; 61 size_t count; 62 63 /* _mm_crc32_u64() needs a 64-bit intermediate value */ 64 crc_tmp64 = crc; 65 66 /* Process as much of the buffer as possible in 64-bit blocks. */ 67 count = len / 8; 68 while (count--) { 69 uint64_t block; 70 71 /* 72 * Use memcpy() to avoid unaligned loads, which are undefined behavior in C. 73 * The compiler will optimize out the memcpy() in release builds. 74 */ 75 memcpy(&block, buf, sizeof(block)); 76 crc_tmp64 = _mm_crc32_u64(crc_tmp64, block); 77 buf += sizeof(block); 78 } 79 crc = (uint32_t)crc_tmp64; 80 81 /* Handle any trailing bytes. */ 82 count = len & 7; 83 while (count--) { 84 crc = _mm_crc32_u8(crc, *(const uint8_t *)buf); 85 buf++; 86 } 87 88 return crc; 89 } 90 91 #elif defined(SPDK_HAVE_ARM_CRC) 92 93 uint32_t 94 spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) 95 { 96 size_t count; 97 98 count = len / 8; 99 while (count--) { 100 uint64_t block; 101 102 memcpy(&block, buf, sizeof(block)); 103 crc = __crc32cd(crc, block); 104 buf += sizeof(block); 105 } 106 107 count = len & 7; 108 while (count--) { 109 crc = __crc32cb(crc, *(const uint8_t *)buf); 110 buf++; 111 } 112 113 return crc; 114 } 115 116 #else /* Neither SSE 4.2 nor ARM CRC32 instructions available */ 117 118 static struct spdk_crc32_table g_crc32c_table; 119 120 __attribute__((constructor)) static void 121 spdk_crc32c_init(void) 122 { 123 spdk_crc32_table_init(&g_crc32c_table, SPDK_CRC32C_POLYNOMIAL_REFLECT); 124 } 125 126 uint32_t 127 spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) 128 { 129 return spdk_crc32_update(&g_crc32c_table, buf, len, crc); 130 } 131 132 #endif 133