500ce16976
The preprocessor code will be needed in another crc-related .c file in an upcoming patch. Signed-off-by: Jim Harris <james.r.harris@intel.com> Change-Id: Icc5e6f0d81f76093dfc973a9c1fe56271baf1ed8 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16687 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (C) 2017 Intel Corporation.
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* All rights reserved.
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*/
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#include "util_internal.h"
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#include "crc_internal.h"
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#include "spdk/crc32.h"
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#ifdef SPDK_HAVE_ISAL
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uint32_t
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spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
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{
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return crc32_iscsi((unsigned char *)buf, len, crc);
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}
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#elif defined(SPDK_HAVE_SSE4_2)
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uint32_t
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spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
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{
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uint64_t crc_tmp64;
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size_t count;
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/* _mm_crc32_u64() needs a 64-bit intermediate value */
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crc_tmp64 = crc;
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/* Process as much of the buffer as possible in 64-bit blocks. */
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count = len / 8;
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while (count--) {
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uint64_t block;
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/*
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* Use memcpy() to avoid unaligned loads, which are undefined behavior in C.
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* The compiler will optimize out the memcpy() in release builds.
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*/
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memcpy(&block, buf, sizeof(block));
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crc_tmp64 = _mm_crc32_u64(crc_tmp64, block);
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buf += sizeof(block);
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}
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crc = (uint32_t)crc_tmp64;
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/* Handle any trailing bytes. */
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count = len & 7;
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while (count--) {
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crc = _mm_crc32_u8(crc, *(const uint8_t *)buf);
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buf++;
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}
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return crc;
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}
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#elif defined(SPDK_HAVE_ARM_CRC)
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uint32_t
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spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
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{
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size_t count;
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count = len / 8;
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while (count--) {
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uint64_t block;
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memcpy(&block, buf, sizeof(block));
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crc = __crc32cd(crc, block);
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buf += sizeof(block);
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}
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count = len & 7;
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while (count--) {
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crc = __crc32cb(crc, *(const uint8_t *)buf);
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buf++;
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}
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return crc;
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}
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#else /* Neither SSE 4.2 nor ARM CRC32 instructions available */
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static struct spdk_crc32_table g_crc32c_table;
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__attribute__((constructor)) static void
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crc32c_init(void)
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{
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crc32_table_init(&g_crc32c_table, SPDK_CRC32C_POLYNOMIAL_REFLECT);
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}
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uint32_t
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spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
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{
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return crc32_update(&g_crc32c_table, buf, len, crc);
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}
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#endif
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uint32_t
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spdk_crc32c_iov_update(struct iovec *iov, int iovcnt, uint32_t crc32c)
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{
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int i;
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if (iov == NULL) {
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return crc32c;
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}
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for (i = 0; i < iovcnt; i++) {
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assert(iov[i].iov_base != NULL);
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assert(iov[i].iov_len != 0);
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crc32c = spdk_crc32c_update(iov[i].iov_base, iov[i].iov_len, crc32c);
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}
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return crc32c;
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}
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