* Zhang Chen (zhangchen.f...@cn.fujitsu.com) wrote:
> From: zhangchen <zhangchen.f...@cn.fujitsu.com>
>
> Jhash used by colo-proxy to save and lookup
> net connection info
>
> Signed-off-by: zhangchen <zhangchen.f...@cn.fujitsu.com>
> Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
> ---
> include/qemu/jhash.h | 61
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 61 insertions(+)
> create mode 100644 include/qemu/jhash.h
>
> diff --git a/include/qemu/jhash.h b/include/qemu/jhash.h
> new file mode 100644
> index 0000000..5b82d02
> --- /dev/null
> +++ b/include/qemu/jhash.h
> @@ -0,0 +1,61 @@
> +/* jhash.h: Jenkins hash support.
> + *
> + * Copyright (C) 2006. Bob Jenkins (bob_jenk...@burtleburtle.net)
> + *
> + * http://burtleburtle.net/bob/hash/
> + *
> + * These are the credits from Bob's sources:
> + *
> + * lookup3.c, by Bob Jenkins, May 2006, Public Domain.
> + *
> + * These are functions for producing 32-bit hashes for hash table lookup.
> + * hashword(), hashlittle(), hashlittle2(), hashbig(), mix(), and final()
> + * are externally useful functions. Routines to test the hash are
> +included
> + * if SELF_TEST is defined. You can use this free for any purpose.
> +It's in
> + * the public domain. It has no warranty.
> + *
> + * Copyright (C) 2009-2010 Jozsef Kadlecsik (kad...@blackhole.kfki.hu)
> + *
> + * I've modified Bob's hash to be useful in the Linux kernel, and
> + * any bugs present are my fault.
> + * Jozsef
> + */
> +
> +#ifndef QEMU_JHASH_H__
> +#define QEMU_JHASH_H__
> +
> +#include "qemu/bitopt.h"
That does not build, the header in qemu is bitop*s*.h.
Dave
> +
> +/*
> + * hashtable relation copy from linux kernel jhash
> + */
> +
> +/* __jhash_mix -- mix 3 32-bit values reversibly. */
> +#define __jhash_mix(a, b, c) \
> +{ \
> + a -= c; a ^= rol32(c, 4); c += b; \
> + b -= a; b ^= rol32(a, 6); a += c; \
> + c -= b; c ^= rol32(b, 8); b += a; \
> + a -= c; a ^= rol32(c, 16); c += b; \
> + b -= a; b ^= rol32(a, 19); a += c; \
> + c -= b; c ^= rol32(b, 4); b += a; \
> +}
> +
> +/* __jhash_final - final mixing of 3 32-bit values (a,b,c) into c */
> +#define __jhash_final(a, b, c) \
> +{ \
> + c ^= b; c -= rol32(b, 14); \
> + a ^= c; a -= rol32(c, 11); \
> + b ^= a; b -= rol32(a, 25); \
> + c ^= b; c -= rol32(b, 16); \
> + a ^= c; a -= rol32(c, 4); \
> + b ^= a; b -= rol32(a, 14); \
> + c ^= b; c -= rol32(b, 24); \
> +}
> +
> +/* An arbitrary initial parameter */
> +#define JHASH_INITVAL 0xdeadbeef
> +
> +#endif /* QEMU_JHASH_H__ */
> --
> 1.9.1
>
>
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
