9d3d419558
* sanitize prototypes, annotate * collapse csum_partial_copy * usual ntohs->shift Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*
|
|
* include/asm-v850/checksum.h -- Checksum ops
|
|
*
|
|
* Copyright (C) 2001,2005 NEC Corporation
|
|
* Copyright (C) 2001,2005 Miles Bader <miles@gnu.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#ifndef __V850_CHECKSUM_H__
|
|
#define __V850_CHECKSUM_H__
|
|
|
|
/*
|
|
* computes the checksum of a memory block at buff, length len,
|
|
* and adds in "sum" (32-bit)
|
|
*
|
|
* returns a 32-bit number suitable for feeding into itself
|
|
* or csum_tcpudp_magic
|
|
*
|
|
* this function must be called with even lengths, except
|
|
* for the last fragment, which may be odd
|
|
*
|
|
* it's best to have buff aligned on a 32-bit boundary
|
|
*/
|
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
|
|
/*
|
|
* the same as csum_partial, but copies from src while it
|
|
* checksums
|
|
*
|
|
* here even more important to align src and dst on a 32-bit (or even
|
|
* better 64-bit) boundary
|
|
*/
|
|
extern __wsum csum_partial_copy_nocheck(const void *src,
|
|
void *dst, int len, __wsum sum);
|
|
|
|
|
|
/*
|
|
* the same as csum_partial_copy, but copies from user space.
|
|
*
|
|
* here even more important to align src and dst on a 32-bit (or even
|
|
* better 64-bit) boundary
|
|
*/
|
|
extern __wsum csum_partial_copy_from_user (const void *src,
|
|
void *dst,
|
|
int len, __wsum sum,
|
|
int *csum_err);
|
|
|
|
__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*/
|
|
static inline __sum16 csum_fold (__wsum sum)
|
|
{
|
|
unsigned int result;
|
|
/*
|
|
%0 %1
|
|
hsw %1, %0 H L L H
|
|
add %1, %0 H L H+L+C H+L
|
|
*/
|
|
asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum));
|
|
return (__force __sum16)(~result >> 16);
|
|
}
|
|
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
static inline __wsum
|
|
csum_tcpudp_nofold (__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto, __wsum sum)
|
|
{
|
|
int __carry;
|
|
__asm__ ("add %2, %0;"
|
|
"setf c, %1;"
|
|
"add %1, %0;"
|
|
"add %3, %0;"
|
|
"setf c, %1;"
|
|
"add %1, %0;"
|
|
"add %4, %0;"
|
|
"setf c, %1;"
|
|
"add %1, %0"
|
|
: "=&r" (sum), "=&r" (__carry)
|
|
: "r" (daddr), "r" (saddr),
|
|
"r" ((len + proto) << 8),
|
|
"0" (sum));
|
|
return sum;
|
|
}
|
|
|
|
static inline __sum16
|
|
csum_tcpudp_magic (__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto, __wsum sum)
|
|
{
|
|
return csum_fold (csum_tcpudp_nofold (saddr, daddr, len, proto, sum));
|
|
}
|
|
|
|
/*
|
|
* this routine is used for miscellaneous IP-like checksums, mainly
|
|
* in icmp.c
|
|
*/
|
|
extern __sum16 ip_compute_csum(const void *buff, int len);
|
|
|
|
|
|
#endif /* __V850_CHECKSUM_H__ */
|