[IA64] implement csum_ipv6_magic for ia64.

The asm version is 4.4 times faster than the generic C version and
10X smaller in code size.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/asm-ia64/checksum.h b/include/asm-ia64/checksum.h
index bd40f4756ce1..2b78582cbd61 100644
--- a/include/asm-ia64/checksum.h
+++ b/include/asm-ia64/checksum.h
@@ -70,4 +70,10 @@ static inline __sum16 csum_fold(__wsum csum)
         return (__force __sum16)~sum;
 }
 
+#define _HAVE_ARCH_IPV6_CSUM    1
+struct in6_addr;
+extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+        struct in6_addr *daddr, __u32 len, unsigned short proto,
+        unsigned int csum);
+
 #endif /* _ASM_IA64_CHECKSUM_H */