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[NET]: POWERPC checksum annotations and cleanups.

Browse source 
* 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 21:21:58 -08:00 committed by David S. Miller
parent 72685fcd28
commit 879178cfbe
1 changed files with 21 additions and 38 deletions
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59
include/asm-powerpc/checksum.h
View file

@ -14,17 +14,16 @@
* which always checksum on 4 octet boundaries. ihl is the number
* of 32-bit words and is always >= 5.
*/
extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
extern unsigned short csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
unsigned short len,
unsigned short proto,
unsigned int sum);
__wsum sum);
/*
* computes the checksum of a memory block at buff, length len,
@ -38,8 +37,7 @@ extern unsigned short csum_tcpudp_magic(unsigned long saddr,
*
* it's best to have buff aligned on a 32-bit boundary
*/
extern unsigned int csum_partial(const unsigned char * buff, int len,
unsigned int sum);
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
/*
* Computes the checksum of a memory block at src, length len,
@ -51,20 +49,15 @@ extern unsigned int csum_partial(const unsigned char * buff, int len,
* Like csum_partial, this must be called with even lengths,
* except for the last fragment.
*/
extern unsigned int csum_partial_copy_generic(const char *src, char *dst,
int len, unsigned int sum,
extern __wsum csum_partial_copy_generic(const void *src, void *dst,
int len, __wsum sum,
int *src_err, int *dst_err);
/*
* the same as csum_partial, but copies from src to dst while it
* checksums.
*/
unsigned int csum_partial_copy_nocheck(const char *src,
char *dst,
int len,
unsigned int sum);
#define csum_partial_copy_from_user(src, dst, len, sum, errp) \
csum_partial_copy_generic((src), (dst), (len), (sum), (errp), NULL)
csum_partial_copy_generic((__force const void *)(src), (dst), (len), (sum), (errp), NULL)
#define csum_partial_copy_nocheck(src, dst, len, sum) \
csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL)
@ -74,7 +67,7 @@ unsigned int csum_partial_copy_nocheck(const char *src,
* turns a 32-bit partial checksum (e.g. from csum_partial) into a
* 1's complement 16-bit checksum.
*/
static inline unsigned int csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum sum)
{
unsigned int tmp;
@ -83,41 +76,32 @@ static inline unsigned int csum_fold(unsigned int sum)
/* if there is a carry from adding the two 16-bit halves,
it will carry from the lower half into the upper half,
giving us the correct sum in the upper half. */
sum = ~(sum + tmp) >> 16;
return sum;
return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
}
/*
* this routine is used for miscellaneous IP-like checksums, mainly
* 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));
}
#ifdef __powerpc64__
static inline u32 csum_tcpudp_nofold(u32 saddr,
u32 daddr,
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
__wsum sum)
{
unsigned long s = sum;
#ifdef __powerpc64__
unsigned long s = (__force u32)sum;
s += saddr;
s += daddr;
s += (proto << 16) + len;
s += (__force u32)saddr;
s += (__force u32)daddr;
s += proto + len;
s += (s >> 32);
return (u32) s;
}
return (__force __wsum) s;
#else
static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
unsigned long daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
{
__asm__("\n\
addc %0,%0,%1 \n\
adde %0,%0,%2 \n\
@ -125,10 +109,9 @@ static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
addze %0,%0 \n\
"
: "=r" (sum)
: "r" (daddr), "r"(saddr), "r"((proto<<16)+len), "0"(sum));
return sum;
}
: "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));
return sum;
#endif
}
#endif /* __KERNEL__ */
#endif