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Commit a4f89fb7 authored by Al Viro's avatar Al Viro Committed by David S. Miller
Browse files

[NET]: X86_64 checksum annotations and cleanups. 



* sanitize prototypes, annotate
* 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 9d3d4195

arch/x86_64/lib/csum-partial.c

+4 −3
Original line number Diff line number Diff line
@@ -132,9 +132,10 @@ static __force_inline unsigned do_csum(const unsigned char *buff, unsigned len) 
 *

 * it's best to have buff aligned on a 64-bit boundary

 */

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

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

{

	return add32_with_carry(do_csum(buff, len), sum); 

	return (__force __wsum)add32_with_carry(do_csum(buff, len),

						(__force u32)sum);

}



EXPORT_SYMBOL(csum_partial);
@@ -143,7 +144,7 @@ EXPORT_SYMBOL(csum_partial); 
 * this routine is used for miscellaneous IP-like checksums, mainly

 * in icmp.c

 */

unsigned short ip_compute_csum(unsigned char * buff, int len)

__sum16 ip_compute_csum(const void *buff, int len)

{

	return csum_fold(csum_partial(buff,len,0));

}

arch/x86_64/lib/csum-wrappers.c

+21 −16
Original line number Diff line number Diff line
@@ -18,9 +18,9 @@ 
 * Returns an 32bit unfolded checksum of the buffer.

 * src and dst are best aligned to 64bits. 

 */ 

unsigned int 

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

			    int len, unsigned int isum, int *errp)

__wsum

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

			    int len, __wsum isum, int *errp)

{ 

	might_sleep();

	*errp = 0;
@@ -34,17 +34,19 @@ csum_partial_copy_from_user(const unsigned char __user *src, unsigned char *dst, 
		if (unlikely((unsigned long)src & 6)) {			

			while (((unsigned long)src & 6) && len >= 2) { 

				__u16 val16;			

				*errp = __get_user(val16, (__u16 __user *)src); 

				*errp = __get_user(val16, (const __u16 __user *)src);

				if (*errp)

					return isum;

				*(__u16 *)dst = val16;

				isum = add32_with_carry(isum, val16); 

				isum = (__force __wsum)add32_with_carry(

						(__force unsigned)isum, val16);

				src += 2; 

				dst += 2; 

				len -= 2;

			}

		}

		isum = csum_partial_copy_generic((__force void *)src,dst,len,isum,errp,NULL);

		isum = csum_partial_copy_generic((__force const void *)src,

					dst, len, isum, errp, NULL);

		if (likely(*errp == 0)) 

			return isum;

	}
@@ -66,9 +68,9 @@ EXPORT_SYMBOL(csum_partial_copy_from_user); 
 * Returns an 32bit unfolded checksum of the buffer.

 * src and dst are best aligned to 64bits.

 */ 

unsigned int 

csum_partial_copy_to_user(unsigned const char *src, unsigned char __user *dst,

			  int len, unsigned int isum, int *errp)

__wsum

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

			  int len, __wsum isum, int *errp)

{ 

	might_sleep();

	if (unlikely(!access_ok(VERIFY_WRITE, dst, len))) {
@@ -79,7 +81,8 @@ csum_partial_copy_to_user(unsigned const char *src, unsigned char __user *dst, 
	if (unlikely((unsigned long)dst & 6)) {

		while (((unsigned long)dst & 6) && len >= 2) { 

			__u16 val16 = *(__u16 *)src;

			isum = add32_with_carry(isum, val16);

			isum = (__force __wsum)add32_with_carry(

					(__force unsigned)isum, val16);

			*errp = __put_user(val16, (__u16 __user *)dst);

			if (*errp)

				return isum;
@@ -104,19 +107,21 @@ EXPORT_SYMBOL(csum_partial_copy_to_user); 
 * 

 * Returns an 32bit unfolded checksum of the buffer.

 */ 

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)

{ 

	return csum_partial_copy_generic(src,dst,len,sum,NULL,NULL);

} 

EXPORT_SYMBOL(csum_partial_copy_nocheck);



unsigned short csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,

			       __u32 len, unsigned short proto, unsigned int sum) 

__sum16 csum_ipv6_magic(const struct in6_addr *saddr,

			const struct in6_addr *daddr,

			__u32 len, unsigned short proto, __wsum sum)

{

	__u64 rest, sum64;

     

	rest = (__u64)htonl(len) + (__u64)htons(proto) + (__u64)sum;

	rest = (__force __u64)htonl(len) + (__force __u64)htons(proto) +

		(__force __u64)sum;

	asm("  addq (%[saddr]),%[sum]\n"

	    "  adcq 8(%[saddr]),%[sum]\n"

	    "  adcq (%[daddr]),%[sum]\n"
@@ -124,7 +129,7 @@ unsigned short csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, 
	    "  adcq $0,%[sum]\n"

	    : [sum] "=r" (sum64) 

	    : "[sum]" (rest),[saddr] "r" (saddr), [daddr] "r" (daddr));

	return csum_fold(add32_with_carry(sum64 & 0xffffffff, sum64>>32));

	return csum_fold((__force __wsum)add32_with_carry(sum64 & 0xffffffff, sum64>>32));

}



EXPORT_SYMBOL(csum_ipv6_magic);

include/asm-x86_64/checksum.h

+28 −26
Original line number Diff line number Diff line
@@ -19,15 +19,16 @@ 
 * the last step before putting a checksum into a packet.

 * Make sure not to mix with 64bit checksums.

 */

static inline unsigned int csum_fold(unsigned int sum)

static inline __sum16 csum_fold(__wsum sum)

{

	__asm__(

		"  addl %1,%0\n"

		"  adcl $0xffff,%0"

		: "=r" (sum)

		: "r" (sum << 16), "0" (sum & 0xffff0000)

		: "r" ((__force u32)sum << 16),

		  "0" ((__force u32)sum & 0xffff0000)

	);

	return (~sum) >> 16;

	return (__force __sum16)(~(__force u32)sum >> 16);

}



/*
@@ -43,7 +44,7 @@ static inline unsigned int csum_fold(unsigned int sum) 
 * iph: ipv4 header

 * ihl: length of header / 4

 */ 

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 sum;
@@ -70,7 +71,7 @@ static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl) 
	: "=r" (sum), "=r" (iph), "=r" (ihl)

	: "1" (iph), "2" (ihl)

	: "memory");

	return(sum);

	return (__force __sum16)sum;

}



/**
@@ -84,16 +85,17 @@ static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl) 
 * Returns the pseudo header checksum the input data. Result is 

 * 32bit unfolded.

 */

static inline unsigned long 

csum_tcpudp_nofold(unsigned saddr, unsigned 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("  addl %1, %0\n"

	    "  adcl %2, %0\n"

	    "  adcl %3, %0\n"

	    "  adcl $0, %0\n"

		: "=r" (sum)

	    : "g" (daddr), "g" (saddr), "g" ((ntohs(len)<<16)+proto*256), "0" (sum));

	    : "g" (daddr), "g" (saddr),

	      "g" ((len + proto)<<8), "0" (sum));

    return sum;

}
@@ -109,9 +111,9 @@ csum_tcpudp_nofold(unsigned saddr, unsigned daddr, unsigned short len, 
 * Returns the 16bit pseudo header checksum the input data already

 * complemented and ready to be filled in.

 */

static inline unsigned short int 

csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,

		  unsigned short len, unsigned short proto, unsigned int sum) 

static inline __sum16

csum_tcpudp_magic(__be32 saddr, __be32 daddr,

		  unsigned short len, unsigned short proto, __wsum sum)

{

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

}
@@ -126,25 +128,25 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, 
 * Before filling it in it needs to be csum_fold()'ed.

 * buff should be aligned to a 64bit boundary if possible.

 */ 

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

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



#define  _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1

#define HAVE_CSUM_COPY_USER 1





/* Do not call this directly. Use the wrappers below */

extern unsigned long csum_partial_copy_generic(const unsigned char *src, const unsigned char *dst,

					       unsigned len,

					       unsigned sum, 

extern __wsum csum_partial_copy_generic(const void *src, const void *dst,

					       int len,

					       __wsum sum,

					       int *src_err_ptr, int *dst_err_ptr);





extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src, unsigned char *dst,

				       int len, unsigned int isum, int *errp);

extern unsigned int csum_partial_copy_to_user(const unsigned char *src, unsigned char __user *dst,

				      int len, unsigned int isum, int *errp);

extern unsigned int csum_partial_copy_nocheck(const unsigned char *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 isum, int *errp);

extern __wsum csum_partial_copy_to_user(const void *src, void __user *dst,

				      int len, __wsum isum, int *errp);

extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,

					      __wsum sum);



/* Old names. To be removed. */

#define csum_and_copy_to_user csum_partial_copy_to_user
@@ -158,7 +160,7 @@ extern unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned 
 * Returns the 16bit folded/inverted checksum of the passed buffer.

 * Ready to fill in.

 */

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

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



/**

 * csum_ipv6_magic - Compute checksum of an IPv6 pseudo header.
@@ -176,9 +178,9 @@ extern unsigned short ip_compute_csum(unsigned char * buff, int len); 
struct in6_addr;



#define _HAVE_ARCH_IPV6_CSUM 1

extern unsigned short 

csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,

		__u32 len, unsigned short proto, unsigned int sum);

extern __sum16

csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,

		__u32 len, unsigned short proto, __wsum sum);



static inline unsigned add32_with_carry(unsigned a, unsigned b)

{