sys/net/toeplitz2.h

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Sepherosa Ziehau <sepherosa@gmail.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #ifndef _NET_TOEPLITZ2_H_
  36 #define _NET_TOEPLITZ2_H_
  37
  38 #ifndef _KERNEL
  39 #error "kernel only header file"
  40 #endif
  41
  42 #define TOEPLITZ_KEYSEED_CNT    2
  43
  44 extern uint32_t toeplitz_cache[TOEPLITZ_KEYSEED_CNT][256];
  45
  46 static __inline uint32_t
  47 toeplitz_rawhash_addrport(in_addr_t _faddr, in_addr_t _laddr,
  48                           in_port_t _fport, in_port_t _lport)
  49 {
  50         uint32_t _res;
  51
  52         _res =  toeplitz_cache[0][_faddr & 0xff];
  53         _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff];
  54         _res ^= toeplitz_cache[0][_laddr & 0xff];
  55         _res ^= toeplitz_cache[0][(_laddr >> 16) & 0xff];
  56         _res ^= toeplitz_cache[0][_fport & 0xff];
  57         _res ^= toeplitz_cache[0][_lport & 0xff];
  58
  59         _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff];
  60         _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff];
  61         _res ^= toeplitz_cache[1][(_laddr >> 8) & 0xff];
  62         _res ^= toeplitz_cache[1][(_laddr >> 24) & 0xff];
  63         _res ^= toeplitz_cache[1][(_fport >> 8) & 0xff];
  64         _res ^= toeplitz_cache[1][(_lport >> 8) & 0xff];
  65
  66         return _res;
  67 }
  68
  69 static __inline uint32_t
  70 toeplitz_rawhash_addr(in_addr_t _faddr, in_addr_t _laddr)
  71 {
  72         uint32_t _res;
  73
  74         _res =  toeplitz_cache[0][_faddr & 0xff];
  75         _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff];
  76         _res ^= toeplitz_cache[0][_laddr & 0xff];
  77         _res ^= toeplitz_cache[0][(_laddr >> 16) & 0xff];
  78
  79         _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff];
  80         _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff];
  81         _res ^= toeplitz_cache[1][(_laddr >> 8) & 0xff];
  82         _res ^= toeplitz_cache[1][(_laddr >> 24) & 0xff];
  83
  84         return _res;
  85 }
  86
  87 static __inline int
  88 toeplitz_hash(uint32_t _rawhash)
  89 {
  90         return (_rawhash & 0xffff);
  91 }
  92
  93 static __inline uint32_t
  94 toeplitz_piecemeal_addr(in_addr_t _faddr)
  95 {
  96         uint32_t _res;
  97
  98         _res =  toeplitz_cache[0][_faddr & 0xff];
  99         _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff];
 100         _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff];
 101         _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff];
 102         return _res;
 103 }
 104
 105 static __inline uint32_t
 106 toeplitz_piecemeal_port(in_port_t _fport)
 107 {
 108         uint32_t _res;
 109
 110         _res  = toeplitz_cache[0][_fport & 0xff];
 111         _res ^= toeplitz_cache[1][(_fport >> 8) & 0xff];
 112
 113         return _res;
 114 }
 115
 116 #endif  /* !_NET_TOEPLITZ2_H_ */