From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49857) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aIRbD-0005FC-1H for qemu-devel@nongnu.org; Sun, 10 Jan 2016 20:48:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aIRb9-0002dN-69 for qemu-devel@nongnu.org; Sun, 10 Jan 2016 20:48:46 -0500 Received: from [59.151.112.132] (port=30209 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aIRb8-0002bp-Fy for qemu-devel@nongnu.org; Sun, 10 Jan 2016 20:48:43 -0500 References: <1450780978-19123-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> <1450780978-19123-3-git-send-email-zhangchen.fnst@cn.fujitsu.com> <20160108120825.GB2477@work-vm> From: Zhang Chen Message-ID: <56930A0D.5000900@cn.fujitsu.com> Date: Mon, 11 Jan 2016 09:49:01 +0800 MIME-Version: 1.0 In-Reply-To: <20160108120825.GB2477@work-vm> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC PATCH v2 02/10] Jhash: add linux kernel jhashtable in qemu List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Dr. David Alan Gilbert" Cc: Li Zhijian , Gui jianfeng , Jason Wang , "eddie.dong" , qemu devel , Huang peng , Gong lei , Stefan Hajnoczi , jan.kiszka@siemens.com, Yang Hongyang , zhanghailiang On 01/08/2016 08:08 PM, Dr. David Alan Gilbert wrote: > * Zhang Chen (zhangchen.fnst@cn.fujitsu.com) wrote: >> From: zhangchen >> >> Jhash used by colo-proxy to save and lookup >> net connection info >> >> Signed-off-by: zhangchen >> Signed-off-by: zhanghailiang >> --- >> 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_jenkins@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 (kadlec@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 I'm very sorry for it, fix it to #include "qemu/bitopts.h" Thanks zhangchen >> + >> +/* >> + * 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 / dgilbert@redhat.com / Manchester, UK > > > . > -- Thanks zhangchen