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 - Caculate 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 --------------------------*/
53 * Description: Caculate multicast hash value by CRC32
57 * pbyMultiAddr - Multicast Address
61 * Return Value: Hash value
64 unsigned char ETHbyGetHashIndexByCrc32 (unsigned char *pbyMultiAddr)
67 unsigned char byTmpHash;
68 unsigned char byHash = 0;
70 // get the least 6-bits from CRC generator
71 byTmpHash = (unsigned char)(CRCdwCrc32(pbyMultiAddr, ETH_ALEN,
73 // reverse most bit to least bit
74 for (ii = 0; ii < (sizeof(byTmpHash) * 8); ii++) {
81 // adjust 6-bits to the right most
87 * Description: Check CRC value of the buffer if Ok or not
91 * pbyBuffer - pointer of buffer (normally is rx buffer)
92 * cbFrameLength - length of buffer, including CRC portion
96 * Return Value: TRUE if ok; FALSE if error.
99 BOOL ETHbIsBufferCrc32Ok (unsigned char *pbyBuffer, unsigned int cbFrameLength)
103 dwCRC = CRCdwGetCrc32(pbyBuffer, cbFrameLength - 4);
104 if (cpu_to_le32(*((unsigned long *)(pbyBuffer + cbFrameLength - 4))) != dwCRC) {