``ETHTOOL_MSG_MM_GET`` get MAC merge layer state
``ETHTOOL_MSG_MM_SET`` set MAC merge layer parameters
``ETHTOOL_MSG_MODULE_FW_FLASH_ACT`` flash transceiver module firmware
+ ``ETHTOOL_MSG_PHY_GET`` get Ethernet PHY information
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Kernel to userspace:
``ETHTOOL_MSG_PLCA_NTF`` PLCA RS parameters
``ETHTOOL_MSG_MM_GET_REPLY`` MAC merge layer status
``ETHTOOL_MSG_MODULE_FW_FLASH_NTF`` transceiver module flash updates
+ ``ETHTOOL_MSG_PHY_GET_REPLY`` Ethernet PHY information
+ ``ETHTOOL_MSG_PHY_NTF`` Ethernet PHY information change
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``GET`` requests are sent by userspace applications to retrieve device