[thirdparty/linux.git] / arch / arm64 / include / asm / checksum.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2016 ARM Ltd.
 */
#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;

	tmp = *(const __uint128_t *)iph;
	iph += 16;
	ihl -= 4;
	tmp += ((tmp >> 64) | (tmp << 64));
	sum = tmp >> 64;
	do {
		sum += *(const u32 *)iph;
		iph += 4;
	} while (--ihl);

	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 */
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
0e455d8e RM	2	/*
0e455d8e RM	3	* Copyright (C) 2016 ARM Ltd.
0e455d8e RM	4	*/
	5	#ifndef __ASM_CHECKSUM_H
	6	#define __ASM_CHECKSUM_H
	7
	8	#include <linux/types.h>
	9
	10	static inline __sum16 csum_fold(__wsum csum)
	11	{
	12	u32 sum = (__force u32)csum;
	13	sum += (sum >> 16) \| (sum << 16);
	14	return ~(__force __sum16)(sum >> 16);
	15	}
	16	#define csum_fold csum_fold
	17
	18	static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
	19	{
	20	__uint128_t tmp;
	21	u64 sum;
	22
	23	tmp = (const __uint128_t )iph;
	24	iph += 16;
	25	ihl -= 4;
	26	tmp += ((tmp >> 64) \| (tmp << 64));
	27	sum = tmp >> 64;
	28	do {
	29	sum += (const u32 )iph;
	30	iph += 4;
	31	} while (--ihl);
	32
	33	sum += ((sum >> 32) \| (sum << 32));
50a4b056	34	return csum_fold((__force u32)(sum >> 32));
0e455d8e RM	35	}
	36	#define ip_fast_csum ip_fast_csum
	37
	38	#include <asm-generic/checksum.h>
	39
	40	#endif /* __ASM_CHECKSUM_H */