| /* |
| * 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 */ |