Mark ng_ether node hooks as HI_STACK. It is usually the last point when

netgraph may unroll the call stack, and I have found that in some cases 2K
guarantied there for i386 may be not enough for NIC driver and BPF.

sys/netgraph/ng_ether.c

@@ -435,7 +435,7 @@ ng_ether_newhook(node_p node, hook_p hook, const char *name)
 	/* Disable hardware checksums while 'upper' hook is connected */
 	if (hookptr == &priv->upper)
 		priv->ifp->if_hwassist = 0;
-
+	NG_HOOK_HI_STACK(hook);
 	/* OK */
 	*hookptr = hook;
 	return (0);