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/* SPDX-License-Identifier: GPL-2.0 */
/*
* See lib/crc64.c for the related specification and polynomial arithmetic.
*/
#ifndef _LINUX_CRC64_H
#define _LINUX_CRC64_H
#include <linux/types.h>
u64 crc64_be_arch(u64 crc, const u8 *p, size_t len);
u64 crc64_be_generic(u64 crc, const u8 *p, size_t len);
u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len);
u64 crc64_nvme_generic(u64 crc, const u8 *p, size_t len);
/**
* crc64_be - Calculate bitwise big-endian ECMA-182 CRC64
* @crc: seed value for computation. 0 or (u64)~0 for a new CRC calculation,
* or the previous crc64 value if computing incrementally.
* @p: pointer to buffer over which CRC64 is run
* @len: length of buffer @p
*/
static inline u64 crc64_be(u64 crc, const void *p, size_t len)
{
if (IS_ENABLED(CONFIG_CRC64_ARCH))
return crc64_be_arch(crc, p, len);
return crc64_be_generic(crc, p, len);
}
/**
* crc64_nvme - Calculate CRC64-NVME
* @crc: seed value for computation. 0 for a new CRC calculation, or the
* previous crc64 value if computing incrementally.
* @p: pointer to buffer over which CRC64 is run
* @len: length of buffer @p
*
* This computes the CRC64 defined in the NVME NVM Command Set Specification,
* *including the bitwise inversion at the beginning and end*.
*/
static inline u64 crc64_nvme(u64 crc, const void *p, size_t len)
{
if (IS_ENABLED(CONFIG_CRC64_ARCH))
return ~crc64_nvme_arch(~crc, p, len);
return ~crc64_nvme_generic(~crc, p, len);
}
#endif /* _LINUX_CRC64_H */
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