> Example:
> - swp1 is a 200G port with 4 lanes.
> - QSFP28 is plugged in.
> - The user wants to select configuration of 100G speed using 2 lanes, 50G
> each.
>
> $ ethtool swp1
> Settings for swp1:
> Supported ports: [ FIBRE Backplane ]
> Supported link modes: 1000baseT/Full
> 10000baseT/Full
> 1000baseKX/Full
> 10000baseKR/Full
> 10000baseR_FEC
> 40000baseKR4/Full
> 40000baseCR4/Full
> 40000baseSR4/Full
> 40000baseLR4/Full
> 25000baseCR/Full
> 25000baseKR/Full
> 25000baseSR/Full
> 50000baseCR2/Full
> 50000baseKR2/Full
> 100000baseKR4/Full
> 100000baseSR4/Full
> 100000baseCR4/Full
> 100000baseLR4_ER4/Full
> 50000baseSR2/Full
> 10000baseCR/Full
> 10000baseSR/Full
> 10000baseLR/Full
> 10000baseER/Full
> 50000baseKR/Full
> 50000baseSR/Full
> 50000baseCR/Full
> 50000baseLR_ER_FR/Full
> 50000baseDR/Full
> 100000baseKR2/Full
> 100000baseSR2/Full
> 100000baseCR2/Full
> 100000baseLR2_ER2_FR2/Full
> 100000baseDR2/Full
I'm not sure i fully understand all these different link modes, but i
thought these 5 are all 100G using 2 lanes? So why cannot the user
simply do
ethtool -s swp1 advertise 100000baseKR2/Full
and the driver can figure out it needs to use two lanes at 50G?
Andrew
