| Robin Murphy | 0e455d8 | 2016-05-31 18:04:40 +0100 | [diff] [blame] | 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 */ |