On Sat, 1 Feb 2020 11:49:19 +0000, Russell King - ARM Linux admin wrote: > What if someone decides to do: > > devlink port split device/1 count 2 > > what do we end up with? Presumably two network devices running with > two serdes lanes each (if supported by the hardware). At that point > can they then do: > > devlink port split device/2 count 2 > > and end up with one network device with two 10G serdes lanes, and two > network devices each with one 10G serdes lane, I think all your guesses are correct, it's a pretty straight forward API, but it's also pretty thin, and some of the logic is in FW, so there isn't much in a way of a standard on how things should behave :S > or can port splitting only be used on the "master" device/port ? I think both mlxsw and the NFP rejects re-split/further splitting. Ports have to be unsplit first. So there is only one device for splitting, and unsplitting can be done on any of the sub-devices. > Unfortunately, I don't think I have any network devices that support > this so I can't experiment to find out how this should work; yes, I > have a Mellanox card, but it supports a single 10G SFP+, and therefore > does not support port splitting. I think you'd need a mlxsw or an nfp to play with this. Maybe Jiri can clarify further :)
