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f9e90c2473
This implementation uses the concurrency kit, CK, API directly which is suitable for use with EPOCH(9) and RCU under FreeBSD. No functional change intended. The initial "linux/hash.h" code was obtained from DragonFlyBSD via FreeBSD's drm-kmod in ports. Differential Revision: https://reviews.freebsd.org/D35162 Reviewed by: bz@ and markj@ MFC after: 1 week Sponsored by: NVIDIA Networking
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 NVIDIA corporation & affiliates.
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* Copyright (c) 2013 François Tigeot
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_LINUX_HASH_H_
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#define _LINUXKPI_LINUX_HASH_H_
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#include <sys/hash.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <asm/types.h>
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#include <linux/bitops.h>
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static inline u64
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hash_64(u64 val, u8 bits)
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{
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u64 ret;
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u8 x;
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ret = bits;
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for (x = 0; x != sizeof(ret); x++) {
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u64 chunk = (val >> (8 * x)) & 0xFF;
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ret = HASHSTEP(ret, chunk);
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}
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return (ret >> (64 - bits));
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}
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static inline u32
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hash_32(u32 val, u8 bits)
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{
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u32 ret;
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u8 x;
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ret = bits;
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for (x = 0; x != sizeof(ret); x++) {
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u32 chunk = (val >> (8 * x)) & 0xFF;
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ret = HASHSTEP(ret, chunk);
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}
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return (ret >> (32 - bits));
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}
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#if BITS_PER_LONG == 64
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#define hash_long(...) hash_64(__VA_ARGS__)
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#else
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#define hash_long(...) hash_32(__VA_ARGS__)
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#endif
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#endif /* _LINUXKPI_LINUX_HASH_H_ */
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