code: func LinkSetVfPortGUID(link Link, vf int, portguid net.HardwareAddr) error {
  	return pkgHandle.LinkSetVfGUID(link, vf, portguid, nl.IFLA_VF_IB_PORT_GUID)
  }
docs: // LinkSetVfPortGUID sets the port GUID of a vf for the link.
  // Equivalent to: `ip link set dev $link vf $vf port_guid $portguid`