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 #ifndef _SYS_SYSTM_H_ 43 #include <sys/systm.h> 44 #endif 45 46 #define TOEPLITZ_KEYSEED_CNT 2 47 48 extern uint32_t toeplitz_cache[TOEPLITZ_KEYSEED_CNT][256]; 49 50 static __inline uint32_t 51 toeplitz_rawhash_addrport(in_addr_t _faddr, in_addr_t _laddr, 52 in_port_t _fport, in_port_t _lport) 53 { 54 uint32_t _res; 55 56 _res = toeplitz_cache[0][_faddr & 0xff]; 57 _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff]; 58 _res ^= toeplitz_cache[0][_laddr & 0xff]; 59 _res ^= toeplitz_cache[0][(_laddr >> 16) & 0xff]; 60 _res ^= toeplitz_cache[0][_fport & 0xff]; 61 _res ^= toeplitz_cache[0][_lport & 0xff]; 62 63 _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff]; 64 _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff]; 65 _res ^= toeplitz_cache[1][(_laddr >> 8) & 0xff]; 66 _res ^= toeplitz_cache[1][(_laddr >> 24) & 0xff]; 67 _res ^= toeplitz_cache[1][(_fport >> 8) & 0xff]; 68 _res ^= toeplitz_cache[1][(_lport >> 8) & 0xff]; 69 70 return _res; 71 } 72 73 static __inline uint32_t 74 toeplitz_rawhash_addr(in_addr_t _faddr, in_addr_t _laddr) 75 { 76 uint32_t _res; 77 78 _res = toeplitz_cache[0][_faddr & 0xff]; 79 _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff]; 80 _res ^= toeplitz_cache[0][_laddr & 0xff]; 81 _res ^= toeplitz_cache[0][(_laddr >> 16) & 0xff]; 82 83 _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff]; 84 _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff]; 85 _res ^= toeplitz_cache[1][(_laddr >> 8) & 0xff]; 86 _res ^= toeplitz_cache[1][(_laddr >> 24) & 0xff]; 87 88 return _res; 89 } 90 91 static __inline int 92 toeplitz_hash(uint32_t _rawhash) 93 { 94 return (_rawhash & ncpus2_mask); 95 } 96 97 #endif /* !_NET_TOEPLITZ2_H_ */ 98