openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

microblaze: clean up checksum.c 

This changes the function prototypes in the checksum code
to have the usual prototypes, typically by turning int
arguments into __wsum.

Also change csum_partial_copy_from_user() to operate
on the right address space and export ip_fast_csum,
which is used in modular networking code.

The new version is now sparse-clean including endianess
checks.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Arnd Bergmann 2009-03-31 15:30:31 +02:00 committed by Michal Simek
parent 838d2406ee
commit 732703af9c
2 changed files with 28 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
arch/microblaze/include/asm/checksum.h
View File

@ -51,7 +51,8 @@ extern __wsum csum_partial(const void *buff, int len, __wsum sum);
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
extern __wsum csum_partial_copy(const char *src, char *dst, int len, int sum);
extern __wsum csum_partial_copy(const void *src, void *dst, int len,
__wsum sum);
/*
* the same as csum_partial_copy, but copies from user space.
@ -59,8 +60,8 @@ extern __wsum csum_partial_copy(const char *src, char *dst, int len, int sum);
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
extern __wsum 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))
@ -75,11 +76,12 @@ extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
/*
* Fold a partial checksum
*/
static inline __sum16 csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum csum)
{
u32 sum = (__force u32)csum;
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
return (__force __sum16)~sum;
}
static inline __sum16
@ -93,6 +95,6 @@ csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/
extern __sum16 ip_compute_csum(const unsigned char *buff, int len);
extern __sum16 ip_compute_csum(const void *buff, int len);
#endif /* _ASM_MICROBLAZE_CHECKSUM_H */

31
arch/microblaze/lib/checksum.c
View File

@ -32,9 +32,10 @@
/* Revised by Kenneth Albanowski for m68knommu. Basic problem: unaligned access
kills, so most of the assembly has to go. */
#include <net/checksum.h>
#include <asm/checksum.h>
#include <linux/module.h>
#include <net/checksum.h>
#include <asm/byteorder.h>
static inline unsigned short from32to16(unsigned long x)
{
@ -102,6 +103,7 @@ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
return (__force __sum16)~do_csum(iph, ihl*4);
}
EXPORT_SYMBOL(ip_fast_csum);
/*
* computes the checksum of a memory block at buff, length len,
@ -115,15 +117,16 @@ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
*
* it's best to have buff aligned on a 32-bit boundary
*/
__wsum csum_partial(const void *buff, int len, __wsum sum)
__wsum csum_partial(const void *buff, int len, __wsum wsum)
{
unsigned int sum = (__force unsigned int)wsum;
unsigned int result = do_csum(buff, len);
/* add in old sum, and carry.. */
result += sum;
if (sum > result)
result += 1;
return result;
return (__force __wsum)result;
}
EXPORT_SYMBOL(csum_partial);
@ -131,9 +134,9 @@ EXPORT_SYMBOL(csum_partial);
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/
__sum16 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);
}
EXPORT_SYMBOL(ip_compute_csum);
@ -141,12 +144,18 @@ EXPORT_SYMBOL(ip_compute_csum);
* copy from fs while checksumming, otherwise like csum_partial
*/
__wsum
csum_partial_copy_from_user(const char __user *src, char *dst, int len,
int sum, int *csum_err)
csum_partial_copy_from_user(const void __user *src, void *dst, int len,
__wsum sum, int *csum_err)
{
if (csum_err)
int missing;
missing = __copy_from_user(dst, src, len);
if (missing) {
memset(dst + len - missing, 0, missing);
*csum_err = -EFAULT;
} else
*csum_err = 0;
memcpy(dst, src, len);
return csum_partial(dst, len, sum);
}
EXPORT_SYMBOL(csum_partial_copy_from_user);
@ -155,7 +164,7 @@ EXPORT_SYMBOL(csum_partial_copy_from_user);
* copy from ds while checksumming, otherwise like csum_partial
*/
__wsum
csum_partial_copy(const char *src, char *dst, int len, int sum)
csum_partial_copy(const void *src, void *dst, int len, __wsum sum)
{
memcpy(dst, src, len);
return csum_partial(dst, len, sum);