53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2016 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_CHECKSUM_H
|
|
#define __ASM_CHECKSUM_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
static inline __sum16 csum_fold(__wsum csum)
|
|
{
|
|
u32 sum = (__force u32)csum;
|
|
sum += (sum >> 16) | (sum << 16);
|
|
return ~(__force __sum16)(sum >> 16);
|
|
}
|
|
#define csum_fold csum_fold
|
|
|
|
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
|
|
{
|
|
__uint128_t tmp;
|
|
u64 sum;
|
|
int n = ihl; /* we want it signed */
|
|
|
|
tmp = *(const __uint128_t *)iph;
|
|
iph += 16;
|
|
n -= 4;
|
|
tmp += ((tmp >> 64) | (tmp << 64));
|
|
sum = tmp >> 64;
|
|
do {
|
|
sum += *(const u32 *)iph;
|
|
iph += 4;
|
|
} while (--n > 0);
|
|
|
|
sum += ((sum >> 32) | (sum << 32));
|
|
return csum_fold((__force u32)(sum >> 32));
|
|
}
|
|
#define ip_fast_csum ip_fast_csum
|
|
|
|
#include <asm-generic/checksum.h>
|
|
|
|
#endif /* __ASM_CHECKSUM_H */
|