/*- * BSD LICENSE * * Copyright (c) Intel Corporation. * All rights reserved. * * 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. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "spdk/crc32.h" #if defined(__aarch64__) || defined(__AARCH64__) #ifdef __ARM_FEATURE_CRC32 #define SPDK_HAVE_ARM_CRC #include #endif #endif #if defined(__x86_64__) && defined(__SSE4_2__) #ifdef SPDK_CONFIG_ISAL #define SPDK_HAVE_ISAL #include #else #define SPDK_HAVE_SSE4_2 #include #endif #endif #ifdef SPDK_HAVE_ISAL uint32_t spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) { return crc32_iscsi((unsigned char *)buf, len, crc); } #elif defined(SPDK_HAVE_SSE4_2) uint32_t spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) { uint64_t crc_tmp64; size_t count; /* _mm_crc32_u64() needs a 64-bit intermediate value */ crc_tmp64 = crc; /* Process as much of the buffer as possible in 64-bit blocks. */ count = len / 8; while (count--) { uint64_t block; /* * Use memcpy() to avoid unaligned loads, which are undefined behavior in C. * The compiler will optimize out the memcpy() in release builds. */ memcpy(&block, buf, sizeof(block)); crc_tmp64 = _mm_crc32_u64(crc_tmp64, block); buf += sizeof(block); } crc = (uint32_t)crc_tmp64; /* Handle any trailing bytes. */ count = len & 7; while (count--) { crc = _mm_crc32_u8(crc, *(const uint8_t *)buf); buf++; } return crc; } #elif defined(SPDK_HAVE_ARM_CRC) uint32_t spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) { size_t count; count = len / 8; while (count--) { uint64_t block; memcpy(&block, buf, sizeof(block)); crc = __crc32cd(crc, block); buf += sizeof(block); } count = len & 7; while (count--) { crc = __crc32cb(crc, *(const uint8_t *)buf); buf++; } return crc; } #else /* Neither SSE 4.2 nor ARM CRC32 instructions available */ static struct spdk_crc32_table g_crc32c_table; __attribute__((constructor)) static void spdk_crc32c_init(void) { spdk_crc32_table_init(&g_crc32c_table, SPDK_CRC32C_POLYNOMIAL_REFLECT); } uint32_t spdk_crc32c_update(const void *buf, size_t len, uint32_t crc) { return spdk_crc32_update(&g_crc32c_table, buf, len, crc); } #endif