[NET]: XTENSA checksum annotations and cleanups.

* sanitize prototypes, annotate
* kill csum_partial_copy_fromuser
* kill csum_partial_copy
* kill useless shifts
* usual ntohs->shift

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-xtensa/checksum.h

@@ -26,7 +26,7 @@
  *
  * 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
@@ -36,7 +36,7 @@ asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsign
  * better 64-bit) boundary
  */
 
-asmlinkage unsigned int csum_partial_copy_generic( const char *src, char *dst, int len, int sum,
+asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst, int len, __wsum sum,
 						   int *src_err_ptr, int *dst_err_ptr);
 
 /*
@@ -46,34 +46,25 @@ asmlinkage unsigned int csum_partial_copy_generic( const char *src, char *dst, i
  *	If you use these functions directly please don't forget the access_ok().
  */
 static inline
-unsigned int csum_partial_copy_nocheck ( const char *src, char *dst,
-					int len, 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);
+	return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
 }
 
 static inline
-unsigned int csum_partial_copy_from_user ( const char *src, char *dst,
-						int len, int sum, int *err_ptr)
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+						int len, __wsum sum, int *err_ptr)
 {
-	return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
+	return csum_partial_copy_generic((__force const void *)src, dst,
+					len, sum, err_ptr, NULL);
 }
 
-/*
- * These are the old (and unsafe) way of doing checksums, a warning message will be
- * printed if they are used and an exeption occurs.
- *
- * these functions should go away after some time.
- */
-
-#define csum_partial_copy_fromuser csum_partial_copy
-unsigned int csum_partial_copy( const char *src, char *dst, int len, int sum);
-
 /*
  *	Fold a partial checksum
  */
 
-static __inline__ unsigned int csum_fold(unsigned int sum)
+static __inline__ __sum16 csum_fold(__wsum sum)
 {
 	unsigned int __dummy;
 	__asm__("extui	%1, %0, 16, 16\n\t"
@@ -87,14 +78,14 @@ static __inline__ unsigned int csum_fold(unsigned int sum)
 		"extui	%0, %0, 0, 16\n\t"
 		: "=r" (sum), "=&r" (__dummy)
 		: "0" (sum));
-	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)
+static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 {
 	unsigned int sum, tmp, endaddr;
 
@@ -127,17 +118,16 @@ static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int
 	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)
 {
 
 #ifdef __XTENSA_EL__
-	unsigned long len_proto = (ntohs(len)<<16)+proto*256;
+	unsigned long len_proto = (len + proto) << 8;
 #elif defined(__XTENSA_EB__)
-	unsigned long len_proto = (proto<<16)+len;
+	unsigned long len_proto = len + proto;
 #else
 # error processor byte order undefined!
 #endif
@@ -162,11 +152,10 @@ 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));
 }
@@ -176,17 +165,16 @@ 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,
-						     __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)
 {
 	unsigned int __dummy;
 	__asm__("l32i	%1, %2, 0\n\t"
@@ -248,8 +236,8 @@ static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
  *	Copy and checksum to user
  */
 #define HAVE_CSUM_COPY_USER
-static __inline__ unsigned int csum_and_copy_to_user (const char *src, char *dst,
-				    int len, int sum, int *err_ptr)
+static __inline__ __wsum csum_and_copy_to_user(const void *src, void __user *dst,
+				    int len, __wsum sum, int *err_ptr)
 {
 	if (access_ok(VERIFY_WRITE, dst, len))
 		return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);
@@ -257,6 +245,6 @@ static __inline__ unsigned int csum_and_copy_to_user (const char *src, char *dst
 	if (len)
 		*err_ptr = -EFAULT;
 
-	return -1; /* invalid checksum */
+	return (__force __wsum)-1; /* invalid checksum */
 }
 #endif