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[NET]: MIPS checksum annotations and cleanups. 

* sanitize prototypes, annotate
* kill shift-by-16 in checksum calculations
* htons->shift in l-e 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 21:18:18 -08:00 committed by David S. Miller
parent 59ed05a7e8
commit 8e3d8433d8
2 changed files with 30 additions and 33 deletions
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8
arch/mips/lib/csum_partial_copy.c
View File

@ -16,8 +16,8 @@
/*
* 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)
{
/*
* It's 2:30 am and I don't feel like doing it real ...
@ -33,8 +33,8 @@ unsigned int csum_partial_copy_nocheck(const unsigned char *src,
* 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;

55
include/asm-mips/checksum.h
View File

@ -27,23 +27,22 @@
*
* 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);
/*
* this is a new version of the above that records errors it finds in *errp,
* but continues and zeros 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 *errp);
__wsum csum_partial_copy_from_user(const void __user *src,
void *dst, int len,
__wsum sum, int *errp);
/*
* Copy and checksum to user
*/
#define HAVE_CSUM_COPY_USER
static inline unsigned int csum_and_copy_to_user (const unsigned char *src,
unsigned char __user *dst,
int len, int sum,
static inline __wsum csum_and_copy_to_user (const void *src, void __user *dst,
int len, __wsum sum,
int *err_ptr)
{
might_sleep();
@ -51,7 +50,7 @@ static inline unsigned int csum_and_copy_to_user (const unsigned char *src,
if (copy_to_user(dst, src, len)) {
*err_ptr = -EFAULT;
return -1;
return (__force __wsum)-1;
}
return sum;
@ -61,13 +60,13 @@ static inline unsigned int csum_and_copy_to_user (const unsigned char *src,
* the same as csum_partial, but copies from user space (but on MIPS
* we have just one address space, so this is identical to the above)
*/
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);
/*
* Fold a partial checksum without adding pseudo headers
*/
static inline unsigned short int csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum sum)
{
__asm__(
" .set push # csum_fold\n"
@ -82,7 +81,7 @@ static inline unsigned short int csum_fold(unsigned int sum)
: "=r" (sum)
: "0" (sum));
return sum;
return (__force __sum16)sum;
}
/*
@ -92,10 +91,10 @@ static inline unsigned short int csum_fold(unsigned int sum)
* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
* Arnt Gulbrandsen.
*/
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)
{
unsigned int *word = (unsigned int *) iph;
unsigned int *stop = word + ihl;
const unsigned int *word = iph;
const unsigned int *stop = word + ihl;
unsigned int csum;
int carry;
@ -123,9 +122,9 @@ static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
return csum_fold(csum);
}
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__(
" .set push # csum_tcpudp_nofold\n"
@ -155,9 +154,9 @@ static inline unsigned int csum_tcpudp_nofold(unsigned long saddr,
: "=r" (sum)
: "0" (daddr), "r"(saddr),
#ifdef __MIPSEL__
"r" (((unsigned long)htons(len)<<16) + proto*256),
"r" ((proto + len) << 8),
#else
"r" (((unsigned long)(proto)<<16) + len),
"r" (proto + len),
#endif
"r" (sum));
@ -168,11 +167,10 @@ static inline unsigned int 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));
}
@ -181,17 +179,16 @@ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
* 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));
}
#define _HAVE_ARCH_IPV6_CSUM
static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u32 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)
{
__asm__(
" .set push # csum_ipv6_magic\n"