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[NET]: M32R checksum annotations and cleanups.

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* sanitize prototypes, annotate
* ntohs -> shift in checksum calculations in l-e case
* kill shift-by-16 in checksum calculations

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 21:16:55 -08:00 committed by David S. Miller
parent 322529961e
commit 85d20dee20
2 changed files with 29 additions and 35 deletions
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12
arch/m32r/lib/csum_partial_copy.c
View file

@ -27,9 +27,8 @@
/*
* Copy while checksumming, otherwise like csum_partial
*/
unsigned int
csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst,
int len, unsigned int sum)
__wsum
csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
{
sum = csum_partial(src, len, sum);
memcpy(dst, src, len);
@ -42,10 +41,9 @@ EXPORT_SYMBOL(csum_partial_copy_nocheck);
* Copy from userspace and compute checksum. If we catch an exception
* then zero the rest of the buffer.
*/
unsigned int
csum_partial_copy_from_user (const unsigned char __user *src,
unsigned char *dst,
int len, unsigned int sum, int *err_ptr)
__wsum
csum_partial_copy_from_user (const void __user *src, void *dst,
int len, __wsum sum, int *err_ptr)
{
int missing;

52
include/asm-m32r/checksum.h
View file

@ -31,8 +31,7 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
asmlinkage unsigned int csum_partial(const unsigned char *buff,
int len, unsigned int sum);
asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
/*
* The same as csum_partial, but copies from src while it checksums.
@ -40,24 +39,22 @@ asmlinkage unsigned int csum_partial(const unsigned char *buff,
* Here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
unsigned char *dst,
int len, unsigned int sum);
extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum);
/*
* This is a new version of the above that records errors it finds in *errp,
* but continues and zeros thre rest of the buffer.
*/
extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
unsigned char *dst,
int len, unsigned int sum,
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum,
int *err_ptr);
/*
* Fold a partial checksum
*/
static inline unsigned int csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum sum)
{
unsigned long tmpreg;
__asm__(
@ -72,16 +69,17 @@ static inline unsigned int csum_fold(unsigned int sum)
: "0" (sum)
: "cbit"
);
return sum;
return (__force __sum16)sum;
}
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
static inline unsigned short ip_fast_csum(unsigned char * iph,
unsigned int ihl) {
unsigned long sum, tmpreg0, tmpreg1;
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
unsigned long tmpreg0, tmpreg1;
__wsum sum;
__asm__ __volatile__(
" ld %0, @%1+ \n"
@ -115,16 +113,15 @@ static inline unsigned short ip_fast_csum(unsigned char * iph,
return csum_fold(sum);
}
static inline unsigned long 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)
{
#if defined(__LITTLE_ENDIAN)
unsigned long len_proto = (ntohs(len)<<16)+proto*256;
unsigned long len_proto = (proto + len) << 8;
#else
unsigned long len_proto = (proto<<16)+len;
unsigned long len_proto = proto + len;
#endif
unsigned long tmpreg;
@ -147,11 +144,10 @@ static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
* computes the checksum of the TCP/UDP pseudo-header
* 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));
}
@ -161,16 +157,16 @@ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
* 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));
}
#define _HAVE_ARCH_IPV6_CSUM
static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u16 len,
unsigned short proto,
unsigned int sum)
static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, unsigned short proto,
__wsum sum)
{
unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3;
__asm__(
@ -197,7 +193,7 @@ static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
: "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
"=&r" (tmpreg2), "=&r" (tmpreg3)
: "r" (saddr), "r" (daddr),
"r" (htonl((__u32) (len))), "r" (htonl(proto)), "0" (sum)
"r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
: "cbit"
);