policer: use ip dscp

Use the common IP definitions of DSCP rather than duplicating in the
policer code.

Type: improvement
Signed-off-by: Brian Russell <brian@graphiant.com>
Change-Id: Iff4bc789356edc290b9c31eca33e93cf5b6211bf
diff --git a/src/vnet/policer/police_inlines.h b/src/vnet/policer/police_inlines.h
index 0ed9730..c3bd324 100644
--- a/src/vnet/policer/police_inlines.h
+++ b/src/vnet/policer/police_inlines.h
@@ -25,7 +25,7 @@
 #define IP6_DSCP_SHIFT    22
 
 static_always_inline void
-vnet_policer_mark (vlib_buffer_t * b, u8 dscp)
+vnet_policer_mark (vlib_buffer_t *b, ip_dscp_t dscp)
 {
   ethernet_header_t *eh;
   ip4_header_t *ip4h;