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1 | /* |
2 | * Copyright (C) 2016 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | #ifndef __ASM_CHECKSUM_H | |
17 | #define __ASM_CHECKSUM_H | |
18 | ||
19 | #include <linux/types.h> | |
20 | ||
21 | static inline __sum16 csum_fold(__wsum csum) | |
22 | { | |
23 | u32 sum = (__force u32)csum; | |
24 | sum += (sum >> 16) | (sum << 16); | |
25 | return ~(__force __sum16)(sum >> 16); | |
26 | } | |
27 | #define csum_fold csum_fold | |
28 | ||
29 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | |
30 | { | |
31 | __uint128_t tmp; | |
32 | u64 sum; | |
33 | ||
34 | tmp = *(const __uint128_t *)iph; | |
35 | iph += 16; | |
36 | ihl -= 4; | |
37 | tmp += ((tmp >> 64) | (tmp << 64)); | |
38 | sum = tmp >> 64; | |
39 | do { | |
40 | sum += *(const u32 *)iph; | |
41 | iph += 4; | |
42 | } while (--ihl); | |
43 | ||
44 | sum += ((sum >> 32) | (sum << 32)); | |
45 | return csum_fold(sum >> 32); | |
46 | } | |
47 | #define ip_fast_csum ip_fast_csum | |
48 | ||
49 | #include <asm-generic/checksum.h> | |
50 | ||
51 | #endif /* __ASM_CHECKSUM_H */ |