root@cumulus:mgmt: ~# ethtool swp1
Settings for swp1:
        Supported ports: [ FIBRE ]         
        SupportedIink modes:  400000baseSR8/Full             
                              400000baseDR8/Full
                              400000baseCR8/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes

        Supported FEC modes: None      RS    BASER
        Advertised Iink modes:400000baseSR8/Full
                              400000baseDR8/Full
                              400000baseCR8/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FFC modes: Not reported
        Speed: 400000Mb/s
        Lanes: 8
        Duplex: Full
        Auto-negotiation: on
        Port: Direct Attach Copper
        PHYAD: 0
        Transceiver: nterna
        Link detected: yes
root@cumulus:mgmt: ~#