zebra: Add basic knowledge of asic offload available

Some linux kernels are starting to support the idea of knowledge
about the underlying asic.  Add a boolean that we can set/unset
to track whether or not we think the router has this functionality
available.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

zebra/zebra_router.c

@@ -290,4 +290,6 @@ void zebra_router_init(void)
 	zrouter.nhgs_id =
 		hash_create_size(8, zebra_nhg_id_key, zebra_nhg_hash_id_equal,
 				 "Zebra Router Nexthop Groups ID index");
+
+	zrouter.asic_offloaded = false;
 }

zebra/zebra_router.h

@@ -182,6 +182,11 @@ struct zebra_router {
 	 */
 	struct hash *nhgs;
 	struct hash *nhgs_id;
+
+	/*
+	 * Does the underlying system provide an asic offload
+	 */
+	bool asic_offloaded;
 };
 
 #define GRACEFUL_RESTART_TIME 60

zebra/zebra_vty.c

@@ -3414,6 +3414,9 @@ DEFUN (show_zebra,
 {
 	struct vrf *vrf;
 
+	if (zrouter.asic_offloaded)
+		vty_out(vty, "Asic Offload is being used\n");
+
 	vty_out(vty,
 		"                            Route      Route      Neighbor   LSP        LSP\n");
 	vty_out(vty,