forked from mirrors/linux
067bc8717a
Add support for architecture-optimized implementations of the CRC64 library functions, following the approach taken for the CRC32 and CRC-T10DIF library functions. Also take the opportunity to tweak the function prototypes: - Use 'const void *' for the lib entry points (since this is easier for users) but 'const u8 *' for the underlying arch and generic functions (since this is easier for the implementations of these functions). - Don't bother with __pure. It's an unusual optimization that doesn't help properly written code. It's a weird quirk we can do without. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: Keith Busch <kbusch@kernel.org> Link: https://lore.kernel.org/r/20250130035130.180676-6-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* See lib/crc64.c for the related specification and polynomial arithmetic.
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*/
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#ifndef _LINUX_CRC64_H
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#define _LINUX_CRC64_H
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#include <linux/types.h>
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u64 crc64_be_arch(u64 crc, const u8 *p, size_t len);
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u64 crc64_be_generic(u64 crc, const u8 *p, size_t len);
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u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len);
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u64 crc64_nvme_generic(u64 crc, const u8 *p, size_t len);
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/**
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* crc64_be - Calculate bitwise big-endian ECMA-182 CRC64
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* @crc: seed value for computation. 0 or (u64)~0 for a new CRC calculation,
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* or the previous crc64 value if computing incrementally.
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* @p: pointer to buffer over which CRC64 is run
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* @len: length of buffer @p
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*/
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static inline u64 crc64_be(u64 crc, const void *p, size_t len)
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{
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if (IS_ENABLED(CONFIG_CRC64_ARCH))
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return crc64_be_arch(crc, p, len);
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return crc64_be_generic(crc, p, len);
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}
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/**
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* crc64_nvme - Calculate CRC64-NVME
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* @crc: seed value for computation. 0 for a new CRC calculation, or the
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* previous crc64 value if computing incrementally.
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* @p: pointer to buffer over which CRC64 is run
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* @len: length of buffer @p
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*
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* This computes the CRC64 defined in the NVME NVM Command Set Specification,
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* *including the bitwise inversion at the beginning and end*.
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*/
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static inline u64 crc64_nvme(u64 crc, const void *p, size_t len)
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{
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if (IS_ENABLED(CONFIG_CRC64_ARCH))
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return ~crc64_nvme_arch(~crc, p, len);
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return ~crc64_nvme_generic(~crc, p, len);
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}
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#endif /* _LINUX_CRC64_H */
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