5bf703b8f3
Init, compute, and fini methods are changed to work on internal context object. This is necessary because ABI does not guarantee that SIMD registers will be preserved on function calls. This is technically the case in Linux kernel in between `kfpu_begin()/kfpu_end()`, but it breaks user-space tests and some kernels that don't require disabling preemption for using SIMD (osx). Use scalar compute methods in-place for small buffers, and when the buffer size does not meet SIMD size alignment. Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
136 lines
4.0 KiB
C
136 lines
4.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright 2013 Saso Kiselkov. All rights reserved.
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*/
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#ifndef _ZFS_FLETCHER_H
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#define _ZFS_FLETCHER_H
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#include <sys/types.h>
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#include <sys/spa_checksum.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* fletcher checksum functions
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*
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* Note: Fletcher checksum methods expect buffer size to be 4B aligned. This
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* limitation stems from the algorithm design. Performing incremental checksum
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* without said alignment would yield different results. Therefore, the code
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* includes assertions for the size alignment.
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* For compatibility, it is required that some code paths calculate checksum of
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* non-aligned buffer sizes. For this purpose, `fletcher_4_native_varsize()`
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* checksum method is added. This method will ignore last (size % 4) bytes of
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* the data buffer.
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*/
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void fletcher_2_native(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_2_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_4_native(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_4_native_varsize(const void *, uint64_t, zio_cksum_t *);
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void fletcher_4_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
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void fletcher_4_incremental_native(const void *, uint64_t,
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zio_cksum_t *);
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void fletcher_4_incremental_byteswap(const void *, uint64_t,
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zio_cksum_t *);
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int fletcher_4_impl_set(const char *selector);
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void fletcher_4_init(void);
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void fletcher_4_fini(void);
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/* Internal fletcher ctx */
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typedef struct zfs_fletcher_sse {
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uint64_t v[2] __attribute__((aligned(16)));
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} zfs_fletcher_sse_t;
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typedef struct zfs_fletcher_avx {
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uint64_t v[4] __attribute__((aligned(32)));
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} zfs_fletcher_avx_t;
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typedef struct zfs_fletcher_avx512 {
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uint64_t v[8] __attribute__((aligned(64)));
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} zfs_fletcher_avx512_t;
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typedef union fletcher_4_ctx {
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zio_cksum_t scalar;
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#if defined(HAVE_SSE2) || (defined(HAVE_SSE2) && defined(HAVE_SSSE3))
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zfs_fletcher_sse_t sse[4];
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#endif
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#if defined(HAVE_AVX) && defined(HAVE_AVX2)
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zfs_fletcher_avx_t avx[4];
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#endif
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#if defined(__x86_64) && defined(HAVE_AVX512F)
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zfs_fletcher_avx512_t avx512[4];
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#endif
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} fletcher_4_ctx_t;
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/*
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* fletcher checksum struct
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*/
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typedef void (*fletcher_4_init_f)(fletcher_4_ctx_t *);
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typedef void (*fletcher_4_fini_f)(fletcher_4_ctx_t *, zio_cksum_t *);
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typedef void (*fletcher_4_compute_f)(fletcher_4_ctx_t *,
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const void *, uint64_t);
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typedef struct fletcher_4_func {
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fletcher_4_init_f init_native;
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fletcher_4_fini_f fini_native;
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fletcher_4_compute_f compute_native;
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fletcher_4_init_f init_byteswap;
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fletcher_4_fini_f fini_byteswap;
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fletcher_4_compute_f compute_byteswap;
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boolean_t (*valid)(void);
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const char *name;
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} fletcher_4_ops_t;
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#if defined(HAVE_SSE2)
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extern const fletcher_4_ops_t fletcher_4_sse2_ops;
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#endif
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#if defined(HAVE_SSE2) && defined(HAVE_SSSE3)
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extern const fletcher_4_ops_t fletcher_4_ssse3_ops;
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#endif
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#if defined(HAVE_AVX) && defined(HAVE_AVX2)
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extern const fletcher_4_ops_t fletcher_4_avx2_ops;
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#endif
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#if defined(__x86_64) && defined(HAVE_AVX512F)
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extern const fletcher_4_ops_t fletcher_4_avx512f_ops;
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZFS_FLETCHER_H */
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