2 * Copyright (c) 2003 VIA Networking, Inc. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 * ETHbyGetHashIndexByCrc32 - Calculate multicast hash value by CRC32
29 * ETHbIsBufferCrc32Ok - Check CRC value of the buffer if Ok or not
40 /*--------------------- Static Definitions -------------------------*/
42 /*--------------------- Static Classes ----------------------------*/
44 /*--------------------- Static Variables --------------------------*/
46 /*--------------------- Static Functions --------------------------*/
48 /*--------------------- Export Variables --------------------------*/
51 * Description: Calculate multicast hash value by CRC32
55 * pbyMultiAddr - Multicast Address
59 * Return Value: Hash value
62 unsigned char ETHbyGetHashIndexByCrc32(unsigned char *pbyMultiAddr)
65 unsigned char byTmpHash;
66 unsigned char byHash = 0;
68 // get the least 6-bits from CRC generator
69 byTmpHash = (unsigned char)(CRCdwCrc32(pbyMultiAddr, ETH_ALEN,
71 // reverse most bit to least bit
72 for (ii = 0; ii < (sizeof(byTmpHash) * 8); ii++) {
79 // adjust 6-bits to the right most
84 * Description: Check CRC value of the buffer if Ok or not
88 * pbyBuffer - pointer of buffer (normally is rx buffer)
89 * cbFrameLength - length of buffer, including CRC portion
93 * Return Value: true if ok; false if error.
96 bool ETHbIsBufferCrc32Ok(unsigned char *pbyBuffer, unsigned int cbFrameLength)
100 dwCRC = CRCdwGetCrc32(pbyBuffer, cbFrameLength - 4);
101 if (cpu_to_le32(*((unsigned long *)(pbyBuffer + cbFrameLength - 4))) != dwCRC)