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[NET]: S390 checksum annotations and cleanups.

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* sanitize prototypes, annotate
* kill useless shifts

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Al Viro 2006-11-14 21:22:18 -08:00 committed by David S. Miller
parent 879178cfbe
commit f994aae1bd
1 changed files with 21 additions and 24 deletions
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45
include/asm-s390/checksum.h
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@ -27,8 +27,8 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
static inline unsigned int
csum_partial(const unsigned char * buff, int len, unsigned int sum)
static inline __wsum
csum_partial(const void *buff, int len, __wsum sum)
{
register unsigned long reg2 asm("2") = (unsigned long) buff;
register unsigned long reg3 asm("3") = (unsigned long) len;
@ -49,9 +49,9 @@ csum_partial(const unsigned char * buff, int len, unsigned int sum)
* Copy from userspace and compute checksum. If we catch an exception
* then zero the rest of the buffer.
*/
static inline unsigned int
csum_partial_copy_from_user(const char __user *src, char *dst,
int len, unsigned int sum,
static inline __wsum
csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum,
int *err_ptr)
{
int missing;
@ -66,8 +66,8 @@ csum_partial_copy_from_user(const char __user *src, char *dst,
}
static inline unsigned int
csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum)
static inline __wsum
csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
{
memcpy(dst,src,len);
return csum_partial(dst, len, sum);
@ -76,8 +76,7 @@ csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum
/*
* Fold a partial checksum without adding pseudo headers
*/
static inline unsigned short
csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum sum)
{
#ifndef __s390x__
register_pair rp;
@ -100,7 +99,7 @@ csum_fold(unsigned int sum)
" srl %0,16\n" /* %0 = H+L+C */
: "+&d" (sum) : : "cc", "2", "3");
#endif /* __s390x__ */
return ((unsigned short) ~sum);
return (__force __sum16) ~sum;
}
/*
@ -108,8 +107,7 @@ csum_fold(unsigned int sum)
* which always checksum on 4 octet boundaries.
*
*/
static inline unsigned short
ip_fast_csum(unsigned char *iph, unsigned int ihl)
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
return csum_fold(csum_partial(iph, ihl*4, 0));
}
@ -118,10 +116,10 @@ ip_fast_csum(unsigned char *iph, unsigned int ihl)
* computes the checksum of the TCP/UDP pseudo-header
* returns a 32-bit checksum
*/
static inline unsigned int
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
unsigned short len, unsigned short proto,
unsigned int sum)
__wsum sum)
{
#ifndef __s390x__
asm volatile(
@ -137,12 +135,12 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
"1:"
: "+&d" (sum) : "d" (daddr) : "cc");
asm volatile(
" alr %0,%1\n" /* sum += (len<<16) + (proto<<8) */
" alr %0,%1\n" /* sum += len + proto */
" brc 12,2f\n"
" ahi %0,1\n" /* add carry */
"2:"
: "+&d" (sum)
: "d" (((unsigned int) len<<16) + (unsigned int) proto)
: "d" (len + proto)
: "cc");
#else /* __s390x__ */
asm volatile(
@ -153,7 +151,7 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
"0: algr %0,%2\n" /* sum += daddr */
" brc 12,1f\n"
" aghi %0,1\n" /* add carry */
"1: algfr %0,%3\n" /* sum += (len<<16) + proto */
"1: algfr %0,%3\n" /* sum += len + proto */
" brc 12,2f\n"
" aghi %0,1\n" /* add carry */
"2: srlg 0,%0,32\n"
@ -163,7 +161,7 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
"3: llgfr %0,%0"
: "+&d" (sum)
: "d" (saddr), "d" (daddr),
"d" (((unsigned int) len<<16) + (unsigned int) proto)
"d" (len + proto)
: "cc", "0");
#endif /* __s390x__ */
return sum;
@ -174,10 +172,10 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
* returns a 16-bit checksum, already complemented
*/
static inline unsigned short int
csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
static inline __sum16
csum_tcpudp_magic(__be32 saddr, __be32 daddr,
unsigned short len, unsigned short proto,
unsigned int sum)
__wsum sum)
{
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}
@ -187,8 +185,7 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
* in icmp.c
*/
static inline unsigned short
ip_compute_csum(unsigned char * buff, int len)
static inline __sum16 ip_compute_csum(const void *buff, int len)
{
return csum_fold(csum_partial(buff, len, 0));
}