From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43341) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aHVqP-0005eV-34 for qemu-devel@nongnu.org; Fri, 08 Jan 2016 07:08:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aHVqL-0001yj-R6 for qemu-devel@nongnu.org; Fri, 08 Jan 2016 07:08:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33924) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aHVqL-0001yZ-Jh for qemu-devel@nongnu.org; Fri, 08 Jan 2016 07:08:33 -0500 Date: Fri, 8 Jan 2016 12:08:25 +0000 From: "Dr. David Alan Gilbert" Message-ID: <20160108120825.GB2477@work-vm> References: <1450780978-19123-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> <1450780978-19123-3-git-send-email-zhangchen.fnst@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1450780978-19123-3-git-send-email-zhangchen.fnst@cn.fujitsu.com> 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: Zhang Chen Cc: Li Zhijian , Gui jianfeng , Jason Wang , "eddie.dong" , qemu devel , Huang peng , Gong lei , Stefan Hajnoczi , jan.kiszka@siemens.com, Yang Hongyang , zhanghailiang * 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 > + > +/* > + * 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