[NET]: H8300 checksum annotations and cleanups.

* sanitize prototypes and annotate
* collapse csum_partial_copy

NB: csum_partial() is almost certainly still buggy.

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 21:16:07 -08:00 committed by David S. Miller
parent 8042c44b8a
commit db521083bc
3 changed files with 32 additions and 30 deletions

View file

@ -39,7 +39,7 @@ EXPORT_SYMBOL(enable_irq);
EXPORT_SYMBOL(disable_irq);
/* Networking helper routines. */
EXPORT_SYMBOL(csum_partial_copy);
EXPORT_SYMBOL(csum_partial_copy_nocheck);
/* The following are special because they're not called
explicitly (the C compiler generates them). Fortunately,

View file

@ -96,9 +96,9 @@ static unsigned long do_csum(const unsigned char * buff, int len)
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
return ~do_csum(iph,ihl*4);
return (__force __sum16)~do_csum(iph,ihl*4);
}
/*
@ -113,15 +113,19 @@ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
*
* it's best to have buff aligned on a 32-bit boundary
*/
unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
/*
* Egads... That thing apparently assumes that *all* checksums it ever sees will
* be folded. Very likely a bug.
*/
__wsum csum_partial(const void *buff, int len, __wsum sum)
{
unsigned int result = do_csum(buff, len);
/* add in old sum, and carry.. */
result += sum;
result += (__force u32)sum;
/* 16+c bits -> 16 bits */
result = (result & 0xffff) + (result >> 16);
return result;
return (__force __wsum)result;
}
EXPORT_SYMBOL(csum_partial);
@ -130,20 +134,21 @@ EXPORT_SYMBOL(csum_partial);
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/
unsigned short ip_compute_csum(const unsigned char * buff, int len)
__sum16 ip_compute_csum(const void *buff, int len)
{
return ~do_csum(buff,len);
return (__force __sum16)~do_csum(buff,len);
}
/*
* copy from fs while checksumming, otherwise like csum_partial
*/
unsigned int
csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *csum_err)
__wsum
csum_partial_copy_from_user(const void __user *src, void *dst, int len,
__wsum sum, int *csum_err)
{
if (csum_err) *csum_err = 0;
memcpy(dst, src, len);
memcpy(dst, (__force const void *)src, len);
return csum_partial(dst, len, sum);
}
@ -151,8 +156,8 @@ csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *c
* copy from ds while checksumming, otherwise like csum_partial
*/
unsigned int
csum_partial_copy(const char *src, char *dst, int len, int sum)
__wsum
csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
{
memcpy(dst, src, len);
return csum_partial(dst, len, sum);

View file

@ -13,7 +13,7 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
__wsum csum_partial(const void *buff, int len, __wsum sum);
/*
* the same as csum_partial, but copies from src while it
@ -23,7 +23,7 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
* better 64-bit) boundary
*/
unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
/*
@ -33,20 +33,17 @@ unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
* better 64-bit) boundary
*/
extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
int len, int sum, int *csum_err);
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum, int *csum_err);
#define csum_partial_copy_nocheck(src, dst, len, sum) \
csum_partial_copy((src), (dst), (len), (sum))
unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
/*
* Fold a partial checksum
*/
static inline unsigned int csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum sum)
{
__asm__("mov.l %0,er0\n\t"
"add.w e0,r0\n\t"
@ -58,7 +55,7 @@ static inline unsigned int csum_fold(unsigned int sum)
: "=r"(sum)
: "0"(sum)
: "er0");
return ~sum;
return (__force __sum16)~sum;
}
@ -67,9 +64,9 @@ static inline unsigned int csum_fold(unsigned int sum)
* returns a 16-bit checksum, already complemented
*/
static inline unsigned int
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
unsigned short proto, unsigned int sum)
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
{
__asm__ ("sub.l er0,er0\n\t"
"add.l %2,%0\n\t"
@ -88,9 +85,9 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
return sum;
}
static inline unsigned short int
csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
unsigned short proto, unsigned int 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));
}
@ -100,6 +97,6 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
* in icmp.c
*/
extern unsigned short ip_compute_csum(const unsigned char * buff, int len);
extern __sum16 ip_compute_csum(const void *buff, int len);
#endif /* _H8300_CHECKSUM_H */