| Message ID | 1471421428-26379-5-git-send-email-zhangchen.fnst@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 2016年08月17日 16:10, Zhang Chen wrote: > Jhash used by colo-compare and filter-rewriter s/used/will be used/ > to save and lookup net connection info > > Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> > Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> > Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> > --- > include/qemu/jhash.h | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 59 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..7222242 > --- /dev/null > +++ b/include/qemu/jhash.h > @@ -0,0 +1,59 @@ > +/* 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/bitops.h" > + > +/* > + * 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__ */
On 08/31/2016 04:05 PM, Jason Wang wrote: > > > On 2016年08月17日 16:10, Zhang Chen wrote: >> Jhash used by colo-compare and filter-rewriter > > s/used/will be used/ > OK~~ Thanks Zhang Chen >> to save and lookup net connection info >> >> Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> >> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> >> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> >> --- >> include/qemu/jhash.h | 59 >> ++++++++++++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 59 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..7222242 >> --- /dev/null >> +++ b/include/qemu/jhash.h >> @@ -0,0 +1,59 @@ >> +/* 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/bitops.h" >> + >> +/* >> + * 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__ */ > > > > . >
diff --git a/include/qemu/jhash.h b/include/qemu/jhash.h new file mode 100644 index 0000000..7222242 --- /dev/null +++ b/include/qemu/jhash.h @@ -0,0 +1,59 @@ +/* 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/bitops.h" + +/* + * 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__ */