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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 19:54:53 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 20:01:40 (GMT) |
commit | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (patch) | |
tree | 3c2086ab67398a019089a47ca3f362a4bc6db74f /drivers/staging/vt6656/tether.c | |
parent | 34e84f39a27d059a3e6ec6e8b94aafa702e6f220 (diff) | |
parent | 9173a8ef24a6b1b8031507b35b8ffe5f85a87692 (diff) | |
download | linux-fsl-qoriq-ae19ffbadc1b2100285a5b5b3d0a4e0a11390904.tar.xz |
Merge branch 'master' into for-linus
Diffstat (limited to 'drivers/staging/vt6656/tether.c')
-rw-r--r-- | drivers/staging/vt6656/tether.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/tether.c b/drivers/staging/vt6656/tether.c new file mode 100644 index 0000000..c90b469 --- /dev/null +++ b/drivers/staging/vt6656/tether.c @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2003 VIA Networking, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * + * File: tether.c + * + * Purpose: + * + * Author: Tevin Chen + * + * Date: May 21, 1996 + * + * Functions: + * ETHbyGetHashIndexByCrc32 - Caculate multicast hash value by CRC32 + * ETHbIsBufferCrc32Ok - Check CRC value of the buffer if Ok or not + * + * Revision History: + * + */ + +#include "device.h" +#include "tmacro.h" +#include "tcrc.h" +#include "tether.h" + +/*--------------------- Static Definitions -------------------------*/ + +/*--------------------- Static Classes ----------------------------*/ + +/*--------------------- Static Variables --------------------------*/ + +/*--------------------- Static Functions --------------------------*/ + +/*--------------------- Export Variables --------------------------*/ + + + +/* + * Description: Caculate multicast hash value by CRC32 + * + * Parameters: + * In: + * pbyMultiAddr - Multicast Address + * Out: + * none + * + * Return Value: Hash value + * + */ +BYTE ETHbyGetHashIndexByCrc32 (PBYTE pbyMultiAddr) +{ + int ii; + BYTE byTmpHash; + BYTE byHash = 0; + + // get the least 6-bits from CRC generator + byTmpHash = (BYTE)(CRCdwCrc32(pbyMultiAddr, U_ETHER_ADDR_LEN, + 0xFFFFFFFFL) & 0x3F); + // reverse most bit to least bit + for (ii = 0; ii < (sizeof(byTmpHash) * 8); ii++) { + byHash <<= 1; + if (byTmpHash & 0x01) + byHash |= 1; + byTmpHash >>= 1; + } + + // adjust 6-bits to the right most + return (byHash >> 2); +} + + +/* + * Description: Check CRC value of the buffer if Ok or not + * + * Parameters: + * In: + * pbyBuffer - pointer of buffer (normally is rx buffer) + * cbFrameLength - length of buffer, including CRC portion + * Out: + * none + * + * Return Value: TRUE if ok; FALSE if error. + * + */ +BOOL ETHbIsBufferCrc32Ok (PBYTE pbyBuffer, UINT cbFrameLength) +{ + DWORD dwCRC; + + dwCRC = CRCdwGetCrc32(pbyBuffer, cbFrameLength - 4); + if (cpu_to_le32(*((PDWORD)(pbyBuffer + cbFrameLength - 4))) != dwCRC) { + return FALSE; + } + return TRUE; +} + |