Sat, Oct 17, 2020 at 12:15:53AM CEST, and...@lunn.ch wrote: >> 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?
100000baseKR2 is 2 lanes. No need to figure anything out. What do you mean by that? > > Andrew
