linux_dsm_epyc7002/include/asm-cris/arch-v32/checksum.h
Al Viro 3532010bcf [NET]: Cris checksum annotations and cleanups.
* sanitize prototypes and annotate
* kill cast-as-lvalue abuses in csum_partial()
* usual ntohs-equals-shift for checksum purposes

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-02 21:23:02 -08:00

30 lines
787 B
C

#ifndef _ASM_CRIS_ARCH_CHECKSUM_H
#define _ASM_CRIS_ARCH_CHECKSUM_H
/*
* Check values used in TCP/UDP headers.
*
* The gain of doing this in assembler instead of C, is that C doesn't
* generate carry-additions for the 32-bit components of the
* checksum. Which means it would be necessary to split all those into
* 16-bit components and then add.
*/
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
unsigned short len, unsigned short proto, __wsum sum)
{
__wsum res;
__asm__ __volatile__ ("add.d %2, %0\n\t"
"addc %3, %0\n\t"
"addc %4, %0\n\t"
"addc 0, %0\n\t"
: "=r" (res)
: "0" (sum), "r" (daddr), "r" (saddr), \
"r" ((len + proto) << 8));
return res;
}
#endif /* _ASM_CRIS_ARCH_CHECKSUM_H */