/* Learn the source MAC. */
if (mac_learning_may_learn(sw->ml, flow->dl_src, 0)) {
struct mac_entry *mac = mac_learning_insert(sw->ml, flow->dl_src, 0);
/* Learn the source MAC. */
if (mac_learning_may_learn(sw->ml, flow->dl_src, 0)) {
struct mac_entry *mac = mac_learning_insert(sw->ml, flow->dl_src, 0);