MAX_MULTICAST_ADDR
if_llmaddr_count(ifp) == MAX_MULTICAST_ADDR)
if (__predict_false(mcnt == MAX_MULTICAST_ADDR)) {
mcnt = min(if_llmaddr_count(ifp), MAX_MULTICAST_ADDR);
if (__predict_false(mcnt == MAX_MULTICAST_ADDR)) {
MAX_MULTICAST_ADDR)
ifp_mcnt >= MAX_MULTICAST_ADDR)