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Commit f994aae1 authored by Al Viro's avatar Al Viro Committed by David S. Miller
Browse files

[NET]: S390 checksum annotations and cleanups. 



* sanitize prototypes, annotate
* kill useless shifts

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 879178cf

include/asm-s390/checksum.h

+21 −24
Original line number Diff line number Diff line
@@ -27,8 +27,8 @@ 
 *

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

 */

static inline unsigned int

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

static inline __wsum

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

{

	register unsigned long reg2 asm("2") = (unsigned long) buff;

	register unsigned long reg3 asm("3") = (unsigned long) len;
@@ -49,9 +49,9 @@ csum_partial(const unsigned char * buff, int len, unsigned int sum) 
 * Copy from userspace and compute checksum.  If we catch an exception

 * then zero the rest of the buffer.

 */

static inline unsigned int

csum_partial_copy_from_user(const char __user *src, char *dst,

                                          int len, unsigned int sum,

static inline __wsum

csum_partial_copy_from_user(const void __user *src, void *dst,

                                          int len, __wsum sum,

                                          int *err_ptr)

{

	int missing;
@@ -66,8 +66,8 @@ csum_partial_copy_from_user(const char __user *src, char *dst, 
}





static inline unsigned int

csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum)

static inline __wsum

csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)

{

        memcpy(dst,src,len);

	return csum_partial(dst, len, sum);
@@ -76,8 +76,7 @@ csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum 
/*

 *      Fold a partial checksum without adding pseudo headers

 */

static inline unsigned short

csum_fold(unsigned int sum)

static inline __sum16 csum_fold(__wsum sum)

{

#ifndef __s390x__

	register_pair rp;
@@ -100,7 +99,7 @@ csum_fold(unsigned int sum) 
		"	srl	%0,16\n"	/* %0 = H+L+C */

		: "+&d" (sum) : : "cc", "2", "3");

#endif /* __s390x__ */

	return ((unsigned short) ~sum);

	return (__force __sum16) ~sum;

}



/*
@@ -108,8 +107,7 @@ csum_fold(unsigned int sum) 
 *	which always checksum on 4 octet boundaries.

 *

 */

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)

{

	return csum_fold(csum_partial(iph, ihl*4, 0));

}
@@ -118,10 +116,10 @@ ip_fast_csum(unsigned char *iph, unsigned int ihl) 
 * computes the checksum of the TCP/UDP pseudo-header

 * returns a 32-bit checksum

 */

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)

                   __wsum sum)

{

#ifndef __s390x__

	asm volatile(
@@ -137,12 +135,12 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, 
		"1:"

		: "+&d" (sum) : "d" (daddr) : "cc");

	asm volatile(

		"	alr	%0,%1\n" /* sum += (len<<16) + (proto<<8) */

		"	alr	%0,%1\n" /* sum += len + proto */

		"	brc	12,2f\n"

		"	ahi	%0,1\n"  /* add carry */

		"2:"

		: "+&d" (sum)

		: "d" (((unsigned int) len<<16) + (unsigned int) proto)

		: "d" (len + proto)

		: "cc");

#else /* __s390x__ */

	asm volatile(
@@ -153,7 +151,7 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, 
		"0:	algr	%0,%2\n"  /* sum += daddr */

		"	brc	12,1f\n"

		"	aghi	%0,1\n"   /* add carry */

		"1:	algfr	%0,%3\n"  /* sum += (len<<16) + proto */

		"1:	algfr	%0,%3\n"  /* sum += len + proto */

		"	brc	12,2f\n"

		"	aghi	%0,1\n"   /* add carry */

		"2:	srlg	0,%0,32\n"
@@ -163,7 +161,7 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, 
		"3:	llgfr	%0,%0"

		: "+&d" (sum)

		: "d" (saddr), "d" (daddr),

		  "d" (((unsigned int) len<<16) + (unsigned int) proto)

		  "d" (len + proto)

		: "cc", "0");

#endif /* __s390x__ */

	return sum;
@@ -174,10 +172,10 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, 
 * 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));

}
@@ -187,8 +185,7 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, 
 * 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));

}