This ioctl is currently routed through generic interface code.
  dev_ioctl
    dev_ethtool
      __ethtool_get_link_ksettings
        phy_ethtool_ioctl
Cc: Felix Fietkau <nbd@nbd.name>
Cc: John Crispin <john@phrozen.org>
Signed-off-by: Petr Štetiar <ynezz@true.cz>