mac_hwrings_idx_get
hw_rh_cnt = mac_hwrings_idx_get(port->lp_mh, g_idx,
hw_rh_cnt = mac_hwrings_idx_get(port->lp_mh, g_idx, NULL, hw_rh,
extern uint_t mac_hwrings_idx_get(mac_handle_t, uint_t, mac_group_handle_t *,