nxge_intr_add
if (nxge_intr_add(nxge, VP_BOUND_TX, channel) != NXGE_OK) {
if (nxge_intr_add(nxge, VP_BOUND_RX, channel) != NXGE_OK) {
extern nxge_status_t nxge_intr_add(nxge_t *, vpc_type_t, int);