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[NET]: PARISC checksum annotations and cleanups.

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* sanitized prototypes, annotated
* kill shift-by-16 in checksum calculation

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 21:18:39 -08:00 committed by David S. Miller
parent 8e3d8433d8
commit 7814e4b6d6
2 changed files with 36 additions and 36 deletions
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17
arch/parisc/lib/checksum.c
View file

@ -101,11 +101,14 @@ out:
/*
* computes a partial checksum, e.g. for TCP/UDP fragments
*/
unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum)
/*
* why bother folding?
*/
__wsum csum_partial(const void *buff, int len, __wsum sum)
{
unsigned int result = do_csum(buff, len);
addc(result, sum);
return from32to16(result);
return (__force __wsum)from32to16(result);
}
EXPORT_SYMBOL(csum_partial);
@ -113,8 +116,8 @@ EXPORT_SYMBOL(csum_partial);
/*
* 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 ...
@ -131,9 +134,9 @@ 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;

55
include/asm-parisc/checksum.h
View file

@ -15,7 +15,7 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
extern unsigned int csum_partial(const unsigned char *, int, unsigned int);
extern __wsum csum_partial(const void *, int, __wsum);
/*
* The same as csum_partial, but copies from src while it checksums.
@ -23,15 +23,14 @@ extern unsigned int csum_partial(const unsigned char *, int, unsigned int);
* 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 *, unsigned char *,
int, unsigned int);
extern __wsum csum_partial_copy_nocheck(const void *, void *, int, __wsum);
/*
* this is a new version of the above that records errors it finds in *errp,
* but continues and zeros the 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, int *errp);
extern __wsum csum_partial_copy_from_user(const void __user *src,
void *dst, int len, __wsum sum, int *errp);
/*
* Optimized for IP headers, which always checksum on 4 octet boundaries.
@ -39,11 +38,10 @@ extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
* Written by Randolph Chung <tausq@debian.org>, and then mucked with by
* LaMont Jones <lamont@debian.org>
*/
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 sum;
__asm__ __volatile__ (
" ldws,ma 4(%1), %0\n"
" addib,<= -4, %2, 2f\n"
@ -69,27 +67,27 @@ static inline unsigned short ip_fast_csum(unsigned char * iph,
: "1" (iph), "2" (ihl)
: "r19", "r20", "r21" );
return(sum);
return (__force __sum16)sum;
}
/*
* Fold a partial checksum
*/
static inline unsigned int csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum csum)
{
u32 sum = (__force u32)csum;
/* add the swapped two 16-bit halves of sum,
a possible carry from adding the two 16-bit halves,
will carry from the lower half into the upper half,
giving us the correct sum in the upper half. */
sum += (sum << 16) + (sum >> 16);
return (~sum) >> 16;
return (__force __sum16)(~sum >> 16);
}
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)
{
__asm__(
" add %1, %0, %0\n"
@ -97,19 +95,18 @@ static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
" addc %3, %0, %0\n"
" addc %%r0, %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;
}
/*
* 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));
}
@ -118,17 +115,17 @@ 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 * buf, int len) {
static inline __sum16 ip_compute_csum(const void *buf, int len)
{
return csum_fold (csum_partial(buf, 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)
{
__asm__ __volatile__ (
@ -193,9 +190,9 @@ static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
* 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)
{
/* code stolen from include/asm-mips64 */
@ -203,7 +200,7 @@ 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;