ip: crash in ip_csum_fold due to illegal instruction shrx

Encounter a crash for the line
	shrx   edi,eax,edi
in ip_csum_fold. The target cpu is ivy bridge which does not support
shrx instruction.

Type: fix
Fixes: e6709ff37dc0f3a58ed5ad98aace73fe801f1e9d

Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: Icc922d3b2ebfcfa721f63946a213b6c492874a9a

diff --git a/src/vnet/ip/ip_packet.h b/src/vnet/ip/ip_packet.h
old mode 100644 (file)
new mode 100755 (executable)
index d862caa..837b3df
--- a/src/vnet/ip/ip_packet.h
+++ b/src/vnet/ip/ip_packet.h
@@ -301,7 +301,7 @@ always_inline u16
 ip_csum_fold (ip_csum_t c)
 {
   /* Reduce to 16 bits. */
-#ifdef __x86_64__
+#if defined(__x86_64__) && defined(__BMI2__)
   u64 tmp;
   asm volatile(
     /* using ADC is much faster than mov, shift, add sequence