/usr/include/libzfs/zfs_fletcher.h is in libzfslinux-dev 0.7.5-1ubuntu15.
This file is owned by root:root, with mode 0o644.
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* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2013 Saso Kiselkov. All rights reserved.
*/
#ifndef _ZFS_FLETCHER_H
#define _ZFS_FLETCHER_H
#include <sys/types.h>
#include <sys/spa_checksum.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* fletcher checksum functions
*
* Note: Fletcher checksum methods expect buffer size to be 4B aligned. This
* limitation stems from the algorithm design. Performing incremental checksum
* without said alignment would yield different results. Therefore, the code
* includes assertions for the size alignment.
* For compatibility, it is required that some code paths calculate checksum of
* non-aligned buffer sizes. For this purpose, `fletcher_4_native_varsize()`
* checksum method is added. This method will ignore last (size % 4) bytes of
* the data buffer.
*/
void fletcher_init(zio_cksum_t *);
void fletcher_2_native(const void *, uint64_t, const void *, zio_cksum_t *);
void fletcher_2_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
void fletcher_4_native(const void *, uint64_t, const void *, zio_cksum_t *);
int fletcher_2_incremental_native(void *, size_t, void *);
int fletcher_2_incremental_byteswap(void *, size_t, void *);
void fletcher_4_native_varsize(const void *, uint64_t, zio_cksum_t *);
void fletcher_4_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
int fletcher_4_incremental_native(void *, size_t, void *);
int fletcher_4_incremental_byteswap(void *, size_t, void *);
int fletcher_4_impl_set(const char *selector);
void fletcher_4_init(void);
void fletcher_4_fini(void);
/* Internal fletcher ctx */
typedef struct zfs_fletcher_superscalar {
uint64_t v[4];
} zfs_fletcher_superscalar_t;
typedef struct zfs_fletcher_sse {
uint64_t v[2] __attribute__((aligned(16)));
} zfs_fletcher_sse_t;
typedef struct zfs_fletcher_avx {
uint64_t v[4] __attribute__((aligned(32)));
} zfs_fletcher_avx_t;
typedef struct zfs_fletcher_avx512 {
uint64_t v[8] __attribute__((aligned(64)));
} zfs_fletcher_avx512_t;
typedef struct zfs_fletcher_aarch64_neon {
uint64_t v[2] __attribute__((aligned(16)));
} zfs_fletcher_aarch64_neon_t;
typedef union fletcher_4_ctx {
zio_cksum_t scalar;
zfs_fletcher_superscalar_t superscalar[4];
#if defined(HAVE_SSE2) || (defined(HAVE_SSE2) && defined(HAVE_SSSE3))
zfs_fletcher_sse_t sse[4];
#endif
#if defined(HAVE_AVX) && defined(HAVE_AVX2)
zfs_fletcher_avx_t avx[4];
#endif
#if defined(__x86_64) && defined(HAVE_AVX512F)
zfs_fletcher_avx512_t avx512[4];
#endif
#if defined(__aarch64__)
zfs_fletcher_aarch64_neon_t aarch64_neon[4];
#endif
} fletcher_4_ctx_t;
/*
* fletcher checksum struct
*/
typedef void (*fletcher_4_init_f)(fletcher_4_ctx_t *);
typedef void (*fletcher_4_fini_f)(fletcher_4_ctx_t *, zio_cksum_t *);
typedef void (*fletcher_4_compute_f)(fletcher_4_ctx_t *,
const void *, uint64_t);
typedef struct fletcher_4_func {
fletcher_4_init_f init_native;
fletcher_4_fini_f fini_native;
fletcher_4_compute_f compute_native;
fletcher_4_init_f init_byteswap;
fletcher_4_fini_f fini_byteswap;
fletcher_4_compute_f compute_byteswap;
boolean_t (*valid)(void);
const char *name;
} fletcher_4_ops_t;
extern const fletcher_4_ops_t fletcher_4_superscalar_ops;
extern const fletcher_4_ops_t fletcher_4_superscalar4_ops;
#if defined(HAVE_SSE2)
extern const fletcher_4_ops_t fletcher_4_sse2_ops;
#endif
#if defined(HAVE_SSE2) && defined(HAVE_SSSE3)
extern const fletcher_4_ops_t fletcher_4_ssse3_ops;
#endif
#if defined(HAVE_AVX) && defined(HAVE_AVX2)
extern const fletcher_4_ops_t fletcher_4_avx2_ops;
#endif
#if defined(__x86_64) && defined(HAVE_AVX512F)
extern const fletcher_4_ops_t fletcher_4_avx512f_ops;
#endif
#if defined(__aarch64__)
extern const fletcher_4_ops_t fletcher_4_aarch64_neon_ops;
#endif
#ifdef __cplusplus
}
#endif
#endif /* _ZFS_FLETCHER_H */
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