tcp: fix outsegs stat for TSO segments

[safe/jmp/linux-2.6] / include / net / checksum.h

diff --git a/include/net/checksum.h b/include/net/checksum.h
index e3ea7cc..ba55d8b 100644 (file)
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -27,8 +27,8 @@
 
 #ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
 static inline
-unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned char *dst,
-                                     int len, int sum, int *err_ptr)
+__wsum csum_and_copy_from_user (const void __user *src, void *dst,
+                                     int len, __wsum sum, int *err_ptr)
 {
        if (access_ok(VERIFY_READ, src, len))
                return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
@@ -41,8 +41,8 @@ unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned
 #endif
 
 #ifndef HAVE_CSUM_COPY_USER
-static __inline__ unsigned int csum_and_copy_to_user
-(const unsigned char *src, unsigned char __user *dst, int len, unsigned 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)
 {
        sum = csum_partial(src, len, sum);
 
@@ -53,35 +53,69 @@ static __inline__ unsigned int csum_and_copy_to_user
        if (len)
                *err_ptr = -EFAULT;
 
-       return -1; /* invalid checksum */
+       return (__force __wsum)-1; /* invalid checksum */
 }
 #endif
 
-static inline unsigned int csum_add(unsigned int csum, unsigned int addend)
+static inline __wsum csum_add(__wsum csum, __wsum addend)
 {
-       csum += addend;
-       return csum + (csum < addend);
+       u32 res = (__force u32)csum;
+       res += (__force u32)addend;
+       return (__force __wsum)(res + (res < (__force u32)addend));
 }
 
-static inline unsigned int csum_sub(unsigned int csum, unsigned int addend)
+static inline __wsum csum_sub(__wsum csum, __wsum addend)
 {
        return csum_add(csum, ~addend);
 }
 
-static inline unsigned int
-csum_block_add(unsigned int csum, unsigned int csum2, int offset)
+static inline __wsum
+csum_block_add(__wsum csum, __wsum csum2, int offset)
 {
+       u32 sum = (__force u32)csum2;
        if (offset&1)
-               csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
-       return csum_add(csum, csum2);
+               sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
+       return csum_add(csum, (__force __wsum)sum);
 }
 
-static inline unsigned int
-csum_block_sub(unsigned int csum, unsigned int csum2, int offset)
+static inline __wsum
+csum_block_sub(__wsum csum, __wsum csum2, int offset)
 {
+       u32 sum = (__force u32)csum2;
        if (offset&1)
-               csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
-       return csum_sub(csum, csum2);
+               sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
+       return csum_sub(csum, (__force __wsum)sum);
+}
+
+static inline __wsum csum_unfold(__sum16 n)
+{
+       return (__force __wsum)n;
+}
+
+#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
+
+static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
+{
+       __be32 diff[] = { ~from, to };
+
+       *sum = csum_fold(csum_partial(diff, sizeof(diff), ~csum_unfold(*sum)));
+}
+
+static inline void csum_replace2(__sum16 *sum, __be16 from, __be16 to)
+{
+       csum_replace4(sum, (__force __be32)from, (__force __be32)to);
+}
+
+struct sk_buff;
+extern void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+                                    __be32 from, __be32 to, int pseudohdr);
+
+static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
+                                           __be16 from, __be16 to,
+                                           int pseudohdr)
+{
+       inet_proto_csum_replace4(sum, skb, (__force __be32)from,
+                                (__force __be32)to, pseudohdr);
 }
 
 #endif