On Thu, Nov 26, 2020 at 05:37:22PM +0200, Baruch Siach wrote:
> Hi netdev list,
>
> I am trying to retrieve all MAC supported link modes
> (ETHTOOL_LINK_MODE_*) for network interfaces with SFP port. The
> 'supported' bit mask that ETHTOOL_GLINKSETTINGS provides in
> link_mode_masks[] changes to match the SFP module that happens to be
> plugged in. When no SFP module is plugged, the bit mask looks
> meaningless.
That sounds like it is doing the correct thing.
> I understand that ETHTOOL_LINK_MODE_* bits are meant to describe PHY
> level capabilities. So I would settle for a MAC level "supported rates"
> list.
What is your use cases?
A MAC without some form a PHY, be it copper, fibre, or a faked
fixed-link, is useless. You need the combination of what the MAC can
do and what the PHY can do to have any meaning information.
Andrew
