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Commit 9d3d4195 authored by Al Viro's avatar Al Viro Committed by David S. Miller
Browse files

[NET]: V850 checksum annotations and cleanups. 



* sanitize prototypes, annotate
* collapse csum_partial_copy
* usual ntohs->shift

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent abf419b8

arch/v850/kernel/v850_ksyms.c

+1 −1
Original line number Diff line number Diff line
@@ -24,7 +24,7 @@ EXPORT_SYMBOL (kernel_thread); 
EXPORT_SYMBOL (__bug);



/* Networking helper routines. */

EXPORT_SYMBOL (csum_partial_copy);

EXPORT_SYMBOL (csum_partial_copy_nocheck);

EXPORT_SYMBOL (csum_partial_copy_from_user);

EXPORT_SYMBOL (ip_compute_csum);

EXPORT_SYMBOL (ip_fast_csum);

arch/v850/lib/checksum.c

+13 −13
Original line number Diff line number Diff line
@@ -88,32 +88,32 @@ static inline unsigned int do_csum(const unsigned char * buff, int len) 
 *	This is a version of ip_compute_csum() optimized for IP headers,

 *	which always checksum on 4 octet boundaries.

 */

unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)

__sum16 ip_fast_csum(const void *iph, unsigned int ihl)

{

	return ~do_csum(iph,ihl*4);

	return (__force __sum16)~do_csum(iph,ihl*4);

}



/*

 * this routine is used for miscellaneous IP-like checksums, mainly

 * in icmp.c

 */

unsigned short 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);

}



/*

 * computes a partial checksum, e.g. for TCP/UDP fragments

 */

unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum)

__wsum csum_partial(const void *buff, int len, __wsum sum)

{

	unsigned int result = do_csum(buff, len);



	/* add in old sum, and carry.. */

	result += sum;

	if(sum > result)

	result += (__force u32)sum;

	if ((__force u32)sum > result)

		result += 1;

	return result;

	return (__force __wsum)result;

}



EXPORT_SYMBOL(csum_partial);
@@ -121,8 +121,8 @@ EXPORT_SYMBOL(csum_partial); 
/*

 * copy while checksumming, otherwise like csum_partial

 */

unsigned int csum_partial_copy(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 ...
@@ -138,9 +138,9 @@ unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst, 
 * 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 *src,

					  unsigned char *dst,

                                          int len, unsigned int sum,

__wsum csum_partial_copy_from_user (const void *src,

					  void *dst,

                                          int len, __wsum sum,

                                          int *err_ptr)

{

	int missing;

include/asm-v850/checksum.h

+17 −21
Original line number Diff line number Diff line
@@ -26,8 +26,7 @@ 
 *

 * it's best to have buff aligned on a 32-bit boundary

 */

extern unsigned int csum_partial (const unsigned char * buff, int len,

				  unsigned int sum);

extern __wsum csum_partial(const void *buff, int len, __wsum sum);



/*

 * the same as csum_partial, but copies from src while it
@@ -36,8 +35,8 @@ extern unsigned int csum_partial (const unsigned char * buff, int len, 
 * here even more important to align src and dst on a 32-bit (or even

 * better 64-bit) boundary

 */

extern unsigned csum_partial_copy (const unsigned char *src,

				   unsigned char *dst, int len, unsigned sum);

extern __wsum csum_partial_copy_nocheck(const void *src,

				   void *dst, int len, __wsum sum);





/*
@@ -46,20 +45,17 @@ extern unsigned csum_partial_copy (const unsigned char *src, 
 * here even more important to align src and dst on a 32-bit (or even

 * better 64-bit) boundary

 */

extern unsigned csum_partial_copy_from_user (const unsigned char *src,

					     unsigned char *dst,

					     int len, unsigned sum,

extern __wsum csum_partial_copy_from_user (const void *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))



unsigned short ip_fast_csum (unsigned char *iph, unsigned int ihl);

__sum16 ip_fast_csum(const void *iph, unsigned int ihl);



/*

 *	Fold a partial checksum

 */

static inline unsigned int csum_fold (unsigned long sum)

static inline __sum16 csum_fold (__wsum sum)

{

	unsigned int result;

	/*
@@ -68,7 +64,7 @@ static inline unsigned int csum_fold (unsigned long sum) 
	      add %1, %0	H     L		H+L+C H+L

	*/

	asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum));

	return (~result) >> 16;

	return (__force __sum16)(~result >> 16);

}
@@ -76,10 +72,10 @@ static inline unsigned int csum_fold (unsigned long sum) 
 * computes the checksum of the TCP/UDP pseudo-header

 * returns a 16-bit checksum, already complemented

 */

static inline unsigned int

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)

		    unsigned short proto, __wsum sum)

{

	int __carry;

	__asm__ ("add %2, %0;"
@@ -93,15 +89,15 @@ csum_tcpudp_nofold (unsigned long saddr, unsigned long daddr, 
		 "add %1, %0"

		 : "=&r" (sum), "=&r" (__carry)

		 : "r" (daddr), "r" (saddr),

		 "r" (ntohs (len) + (proto << 8)),

		 "r" ((len + proto) << 8),

		 "0" (sum));

	return sum;

}



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)

		   unsigned short proto, __wsum sum)

{

	return csum_fold (csum_tcpudp_nofold (saddr, daddr, len, proto, sum));

}
@@ -110,7 +106,7 @@ csum_tcpudp_magic (unsigned long saddr, unsigned long daddr, 
 * this routine is used for miscellaneous IP-like checksums, mainly

 * in icmp.c

 */

extern unsigned short ip_compute_csum (const unsigned char * buff, int len);

extern __sum16 ip_compute_csum(const void *buff, int len);





#endif /* __V850_CHECKSUM_H__ */