[NET]: ARM checksum annotations and cleanups.

* sanitize prototypes, annotate
* kill csum_partial_copy
* usual ntohs->shift, this time in assembler part

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

1 files changed, 41 insertions, 42 deletions

diff --git a/include/asm-arm/checksum.h b/include/asm-arm/checksum.h
index 747bdd31a74b..8c0bb5bb14ee 100644
--- a/include/asm-arm/checksum.h
+++ b/include/asm-arm/checksum.h
@@ -23,7 +23,7 @@
  *
  * 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);
 
 /*
  * the same as csum_partial, but copies from src while it
@@ -33,26 +33,18 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
  * better 64-bit) boundary
  */
 
-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);
 
-unsigned int
-csum_partial_copy_from_user(const char __user *src, char *dst, int len, int sum, int *err_ptr);
-
-/*
- * This is the old (and unsafe) way of doing checksums, a warning message will
- * be printed if it is used and an exception occurs.
- *
- * this functions should go away after some time.
- */
-#define csum_partial_copy(src,dst,len,sum)      csum_partial_copy_nocheck(src,dst,len,sum)
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr);
 
 /*
  *      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, tmp1;
 
@@ -78,14 +70,13 @@ ip_fast_csum(unsigned char * iph, unsigned int ihl)
         : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (tmp1)
         : "1" (iph), "2" (ihl)
         : "cc", "memory");
-        return sum;
+        return (__force __sum16)sum;
 }
 
 /*
  *      Fold a partial checksum without adding pseudo headers
  */
-static inline unsigned int
-csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum sum)
 {
         __asm__(
         "adds   %0, %1, %1, lsl #16     @ csum_fold             \n\
@@ -93,21 +84,25 @@ csum_fold(unsigned int sum)
         : "=r" (sum)
         : "r" (sum)
         : "cc");
-        return (~sum) >> 16;
+        return (__force __sum16)(~(__force u32)sum >> 16);
 }
 
-static inline unsigned int
-csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
-                   unsigned int proto, unsigned int sum)
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+                   unsigned short proto, __wsum sum)
 {
         __asm__(
         "adds   %0, %1, %2              @ csum_tcpudp_nofold    \n\
-        adcs    %0, %0, %3                                      \n\
-        adcs    %0, %0, %4                                      \n\
-        adcs    %0, %0, %5                                      \n\
+        adcs    %0, %0, %3                                      \n"
+#ifdef __ARMEB__
+        "adcs   %0, %0, %4                                      \n"
+#else
+        "adcs   %0, %0, %4, lsl #8                              \n"
+#endif
+        "adcs   %0, %0, %5                                      \n\
         adc     %0, %0, #0"
         : "=&r"(sum)
-        : "r" (sum), "r" (daddr), "r" (saddr), "r" (ntohs(len)), "Ir" (ntohs(proto))
+        : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
         : "cc");
         return sum;
 }       
@@ -115,23 +110,27 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
  * 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, unsigned short len,
-                  unsigned int proto, unsigned int sum)
+static inline __sum16
+csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
+                  unsigned short proto, __wsum sum)
 {
         __asm__(
         "adds   %0, %1, %2              @ csum_tcpudp_magic     \n\
-        adcs    %0, %0, %3                                      \n\
-        adcs    %0, %0, %4                                      \n\
-        adcs    %0, %0, %5                                      \n\
+        adcs    %0, %0, %3                                      \n"
+#ifdef __ARMEB__
+        "adcs   %0, %0, %4                                      \n"
+#else
+        "adcs   %0, %0, %4, lsl #8                              \n"
+#endif
+        "adcs   %0, %0, %5                                      \n\
         adc     %0, %0, #0                                      \n\
         adds    %0, %0, %0, lsl #16                             \n\
         addcs   %0, %0, #0x10000                                \n\
         mvn     %0, %0"
         : "=&r"(sum)
-        : "r" (sum), "r" (daddr), "r" (saddr), "r" (ntohs(len)), "Ir" (ntohs(proto))
+        : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
         : "cc");
-        return sum >> 16;
+        return (__force __sum16)((__force u32)sum >> 16);
 }
 
 
@@ -139,20 +138,20 @@ csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
  * 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
-extern unsigned long
-__csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, __u32 len,
-                __u32 proto, unsigned int sum);
+extern __wsum
+__csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, __be32 len,
+                __be32 proto, __wsum sum);
 
-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)
 {
         return csum_fold(__csum_ipv6_magic(saddr, daddr, htonl(len),
                                            htonl(proto), sum));