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Commit 85d20dee authored by Al Viro's avatar Al Viro Committed by David S. Miller
Browse files

[NET]: M32R checksum annotations and cleanups. 



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

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 32252996

arch/m32r/lib/csum_partial_copy.c

+5 −7
Original line number Diff line number Diff line
@@ -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;

include/asm-m32r/checksum.h

+24 −28
Original line number Diff line number Diff line
@@ -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"

	);