mlxsw: spectrum_ethtool: Add link extended state
Implement .get_down_ext_state() as part of ethtool_ops. Query link down reason from PDDR register and convert it to ethtool link_ext_state. In case that more information than common link_ext_state is provided, fill link_ext_substate also with the appropriate value. Signed-off-by: Amit Cohen <amitc@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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