87 строки
2.2 KiB
C
87 строки
2.2 KiB
C
/* MN10300 Optimised checksumming code
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_CHECKSUM_H
|
|
#define _ASM_CHECKSUM_H
|
|
|
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
|
|
int len, __wsum sum);
|
|
extern __wsum csum_partial_copy_from_user(const void *src, void *dst,
|
|
int len, __wsum sum,
|
|
int *err_ptr);
|
|
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
|
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
extern __sum16 ip_compute_csum(const void *buff, int len);
|
|
|
|
#define csum_partial_copy_fromuser csum_partial_copy
|
|
extern __wsum csum_partial_copy(const void *src, void *dst, int len,
|
|
__wsum sum);
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
asm(
|
|
" add %1,%0 \n"
|
|
" addc 0xffff,%0 \n"
|
|
: "=r" (sum)
|
|
: "r" (sum << 16), "0" (sum & 0xffff0000)
|
|
: "cc"
|
|
);
|
|
return (~sum) >> 16;
|
|
}
|
|
|
|
static inline __wsum csum_tcpudp_nofold(unsigned long saddr,
|
|
unsigned long daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
__wsum tmp;
|
|
|
|
tmp = (__wsum) ntohs(len) << 16;
|
|
tmp += (__wsum) proto << 8;
|
|
|
|
asm(
|
|
" add %1,%0 \n"
|
|
" addc %2,%0 \n"
|
|
" addc %3,%0 \n"
|
|
" addc 0,%0 \n"
|
|
: "=r" (sum)
|
|
: "r" (daddr), "r"(saddr), "r"(tmp), "0"(sum)
|
|
: "cc"
|
|
);
|
|
return sum;
|
|
}
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
static inline __sum16 csum_tcpudp_magic(unsigned long saddr,
|
|
unsigned long daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
|
|
}
|
|
|
|
#undef _HAVE_ARCH_IPV6_CSUM
|
|
|
|
/*
|
|
* Copy and checksum to user
|
|
*/
|
|
#define HAVE_CSUM_COPY_USER
|
|
extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len,
|
|
__wsum sum, int *err_ptr);
|
|
|
|
|
|
#endif /* _ASM_CHECKSUM_H */
|