include/zfs_fletcher.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or https://opensource.org/licenses/CDDL-1.0.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright 2013 Saso Kiselkov. All rights reserved.
  27  */
  28
  29 #ifndef _ZFS_FLETCHER_H
  30 #define _ZFS_FLETCHER_H extern __attribute__((visibility("default")))
  31
  32 #include <sys/types.h>
  33 #include <sys/spa_checksum.h>
  34
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /*
  40  * fletcher checksum functions
  41  *
  42  * Note: Fletcher checksum methods expect buffer size to be 4B aligned. This
  43  * limitation stems from the algorithm design. Performing incremental checksum
  44  * without said alignment would yield different results. Therefore, the code
  45  * includes assertions for the size alignment.
  46  * For compatibility, it is required that some code paths calculate checksum of
  47  * non-aligned buffer sizes. For this purpose, `fletcher_4_native_varsize()`
  48  * checksum method is added. This method will ignore last (size % 4) bytes of
  49  * the data buffer.
  50  */
  51 _ZFS_FLETCHER_H void fletcher_init(zio_cksum_t *);
  52 _ZFS_FLETCHER_H void fletcher_2_native(const void *, uint64_t, const void *,
  53     zio_cksum_t *);
  54 _ZFS_FLETCHER_H void fletcher_2_byteswap(const void *, uint64_t, const void *,
  55     zio_cksum_t *);
  56 _ZFS_FLETCHER_H void fletcher_4_native(const void *, uint64_t, const void *,
  57     zio_cksum_t *);
  58 _ZFS_FLETCHER_H int fletcher_2_incremental_native(void *, size_t, void *);
  59 _ZFS_FLETCHER_H int fletcher_2_incremental_byteswap(void *, size_t, void *);
  60 _ZFS_FLETCHER_H void fletcher_4_native_varsize(const void *, uint64_t,
  61     zio_cksum_t *);
  62 _ZFS_FLETCHER_H void fletcher_4_byteswap(const void *, uint64_t, const void *,
  63     zio_cksum_t *);
  64 _ZFS_FLETCHER_H int fletcher_4_incremental_native(void *, size_t, void *);
  65 _ZFS_FLETCHER_H int fletcher_4_incremental_byteswap(void *, size_t, void *);
  66 _ZFS_FLETCHER_H int fletcher_4_impl_set(const char *selector);
  67 _ZFS_FLETCHER_H void fletcher_4_init(void);
  68 _ZFS_FLETCHER_H void fletcher_4_fini(void);
  69
  70
  71
  72 /* Internal fletcher ctx */
  73
  74 typedef struct zfs_fletcher_superscalar {
  75         uint64_t v[4];
  76 } zfs_fletcher_superscalar_t;
  77
  78 typedef struct zfs_fletcher_sse {
  79         uint64_t v[2];
  80 } zfs_fletcher_sse_t;
  81
  82 typedef struct zfs_fletcher_avx {
  83         uint64_t v[4];
  84 } zfs_fletcher_avx_t;
  85
  86 typedef struct zfs_fletcher_avx512 {
  87         uint64_t v[8];
  88 } zfs_fletcher_avx512_t;
  89
  90 typedef struct zfs_fletcher_aarch64_neon {
  91         uint64_t v[2];
  92 } zfs_fletcher_aarch64_neon_t;
  93
  94
  95 typedef union fletcher_4_ctx {
  96         zio_cksum_t scalar;
  97         zfs_fletcher_superscalar_t superscalar[4];
  98
  99 #if defined(HAVE_SSE2) || (defined(HAVE_SSE2) && defined(HAVE_SSSE3))
 100         zfs_fletcher_sse_t sse[4];
 101 #endif
 102 #if defined(HAVE_AVX) && defined(HAVE_AVX2)
 103         zfs_fletcher_avx_t avx[4];
 104 #endif
 105 #if defined(__x86_64) && defined(HAVE_AVX512F)
 106         zfs_fletcher_avx512_t avx512[4];
 107 #endif
 108 #if defined(__aarch64__)
 109         zfs_fletcher_aarch64_neon_t aarch64_neon[4];
 110 #endif
 111 } fletcher_4_ctx_t;
 112
 113 /*
 114  * fletcher checksum struct
 115  */
 116 typedef void (*fletcher_4_init_f)(fletcher_4_ctx_t *);
 117 typedef void (*fletcher_4_fini_f)(fletcher_4_ctx_t *, zio_cksum_t *);
 118 typedef void (*fletcher_4_compute_f)(fletcher_4_ctx_t *,
 119     const void *, uint64_t);
 120
 121 typedef struct fletcher_4_func {
 122         fletcher_4_init_f init_native;
 123         fletcher_4_fini_f fini_native;
 124         fletcher_4_compute_f compute_native;
 125         fletcher_4_init_f init_byteswap;
 126         fletcher_4_fini_f fini_byteswap;
 127         fletcher_4_compute_f compute_byteswap;
 128         boolean_t (*valid)(void);
 129         boolean_t uses_fpu;
 130         const char *name;
 131 } __attribute__((aligned(64))) fletcher_4_ops_t;
 132
 133 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_superscalar_ops;
 134 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_superscalar4_ops;
 135
 136 #if defined(HAVE_SSE2)
 137 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_sse2_ops;
 138 #endif
 139
 140 #if defined(HAVE_SSE2) && defined(HAVE_SSSE3)
 141 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_ssse3_ops;
 142 #endif
 143
 144 #if defined(HAVE_AVX) && defined(HAVE_AVX2)
 145 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_avx2_ops;
 146 #endif
 147
 148 #if defined(__x86_64) && defined(HAVE_AVX512F)
 149 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_avx512f_ops;
 150 #endif
 151
 152 #if defined(__x86_64) && defined(HAVE_AVX512BW)
 153 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_avx512bw_ops;
 154 #endif
 155
 156 #if defined(__aarch64__)
 157 _ZFS_FLETCHER_H const fletcher_4_ops_t fletcher_4_aarch64_neon_ops;
 158 #endif
 159
 160 #ifdef  __cplusplus
 161 }
 162 #endif
 163
 164 #endif  /* _ZFS_FLETCHER_H */