[NET]: MIPS checksum annotations and cleanups.

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

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

1 files changed, 26 insertions, 29 deletions

diff --git a/include/asm-mips/checksum.h b/include/asm-mips/checksum.h
index a5e6050ec0f3..9b768c3b96b3 100644
--- a/include/asm-mips/checksum.h
+++ b/include/asm-mips/checksum.h
@@ -27,23 +27,22 @@
  *
  * it's best to have buff aligned on a 32-bit boundary
  */
-unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);
+__wsum csum_partial(const void *buff, int len, __wsum sum);
 
 /*
  * this is a new version of the above that records errors it finds in *errp,
  * but continues and zeros 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 *errp);
+__wsum csum_partial_copy_from_user(const void __user *src,
+                                         void *dst, int len,
+                                         __wsum sum, int *errp);
 
 /*
  * Copy and checksum to user
  */
 #define HAVE_CSUM_COPY_USER
-static inline unsigned int csum_and_copy_to_user (const unsigned char *src,
-                                                  unsigned char __user *dst,
-                                                  int len, int sum,
+static inline __wsum csum_and_copy_to_user (const void *src, void __user *dst,
+                                                  int len, __wsum sum,
                                                   int *err_ptr)
 {
         might_sleep();
@@ -51,7 +50,7 @@ static inline unsigned int csum_and_copy_to_user (const unsigned char *src,
 
         if (copy_to_user(dst, src, len)) {
                 *err_ptr = -EFAULT;
-                return -1;
+                return (__force __wsum)-1;
         }
 
         return sum;
@@ -61,13 +60,13 @@ static inline unsigned int csum_and_copy_to_user (const unsigned char *src,
  * the same as csum_partial, but copies from user space (but on MIPS
  * we have just one address space, so this is identical to the above)
  */
-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);
 
 /*
  *      Fold a partial checksum without adding pseudo headers
  */
-static inline unsigned short int csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum sum)
 {
         __asm__(
         "       .set    push            # csum_fold\n"
@@ -82,7 +81,7 @@ static inline unsigned short int csum_fold(unsigned int sum)
         : "=r" (sum)
         : "0" (sum));
 
-        return sum;
+        return (__force __sum16)sum;
 }
 
 /*
@@ -92,10 +91,10 @@ static inline unsigned short int csum_fold(unsigned int sum)
  *      By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
  *      Arnt Gulbrandsen.
  */
-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 *word = (unsigned int *) iph;
-        unsigned int *stop = word + ihl;
+        const unsigned int *word = iph;
+        const unsigned int *stop = word + ihl;
         unsigned int csum;
         int carry;
 
@@ -123,9 +122,9 @@ static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
         return csum_fold(csum);
 }
 
-static inline unsigned int csum_tcpudp_nofold(unsigned long saddr,
-        unsigned long 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__(
         "       .set    push            # csum_tcpudp_nofold\n"
@@ -155,9 +154,9 @@ static inline unsigned int csum_tcpudp_nofold(unsigned long saddr,
         : "=r" (sum)
         : "0" (daddr), "r"(saddr),
 #ifdef __MIPSEL__
-          "r" (((unsigned long)htons(len)<<16) + proto*256),
+          "r" ((proto + len) << 8),
 #else
-          "r" (((unsigned long)(proto)<<16) + len),
+          "r" (proto + len),
 #endif
           "r" (sum));
 
@@ -168,11 +167,10 @@ static inline unsigned int 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));
 }
@@ -181,17 +179,16 @@ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
  * this routine is used for miscellaneous IP-like checksums, mainly
  * 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)
 {
         __asm__(
         "       .set    push            # csum_ipv6_magic\n"