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.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
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]
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 * Copyright 2013 Saso Kiselkov. All rights reserved.
29 #ifndef _ZFS_FLETCHER_H
30 #define _ZFS_FLETCHER_H
32 #include <sys/types.h>
33 #include <sys/spa_checksum.h>
40 * fletcher checksum functions
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
51 void fletcher_2_native(const void *, uint64_t, const void *, zio_cksum_t *);
52 void fletcher_2_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
53 void fletcher_4_native(const void *, uint64_t, const void *, zio_cksum_t *);
54 void fletcher_4_native_varsize(const void *, uint64_t, zio_cksum_t *);
55 void fletcher_4_byteswap(const void *, uint64_t, const void *, zio_cksum_t *);
56 void fletcher_4_incremental_native(const void *, uint64_t,
58 void fletcher_4_incremental_byteswap(const void *, uint64_t,
60 int fletcher_4_impl_set(const char *selector);
61 void fletcher_4_init(void);
62 void fletcher_4_fini(void);
66 * fletcher checksum struct
68 typedef void (*fletcher_4_init_f)(zio_cksum_t *);
69 typedef void (*fletcher_4_fini_f)(zio_cksum_t *);
70 typedef void (*fletcher_4_compute_f)(const void *, uint64_t, zio_cksum_t *);
72 typedef struct fletcher_4_func {
73 fletcher_4_init_f init_native;
74 fletcher_4_fini_f fini_native;
75 fletcher_4_compute_f compute_native;
76 fletcher_4_init_f init_byteswap;
77 fletcher_4_fini_f fini_byteswap;
78 fletcher_4_compute_f compute_byteswap;
79 boolean_t (*valid)(void);
83 #if defined(HAVE_SSE2)
84 extern const fletcher_4_ops_t fletcher_4_sse2_ops;
87 #if defined(HAVE_SSE2) && defined(HAVE_SSSE3)
88 extern const fletcher_4_ops_t fletcher_4_ssse3_ops;
91 #if defined(HAVE_AVX) && defined(HAVE_AVX2)
92 extern const fletcher_4_ops_t fletcher_4_avx2_ops;
95 #if defined(__x86_64) && defined(HAVE_AVX512F)
96 extern const fletcher_4_ops_t fletcher_4_avx512f_ops;
103 #endif /* _ZFS_FLETCHER_H */