def find_pfc_wwpn_by_name(vios_w, pfc_name):
    """Returns the physical port wwpn within a VIOS based off the FC port name.

    :param vios_w: VIOS wrapper.
    :param pfc_name: The physical fibre channel port name.
    """
    for port in vios_w.pfc_ports:
        if port.name == pfc_name:
            return port.wwpn
    return None