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Commit 8e3d8433 authored by Al Viro's avatar Al Viro Committed by David S. Miller
Browse files

[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: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 59ed05a7

arch/mips/lib/csum_partial_copy.c

+4 −4
Original line number Diff line number Diff line
@@ -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;

include/asm-mips/checksum.h

+26 −29
Original line number Diff line number Diff line
@@ -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"