On Wed, 14 May 2025 15:44:49 +0200 Szapar-Mudlaw, Martyna wrote: > The link-down events counter increments upon actual physical link-down > events, doesn't increment when user performs a simple down/up of the > interface. > > However there is indeed link down event from firmware - as > part of interface reinitialization eg. when attaching XDP program, > reconfiguring channels and setting interface priv-flags.
Maybe I'm misunderstanding, but are you saying that the link-down counter doesn't increment on ifdown+ifup but it does increment when attaching an XDP prog? The definition of link_down_events is pretty simple - (plus minus the quantum world of signals) the link_down_events is physical link downs which the switch / remote end will also see. Unlike software carrier off which may just configure the MAC or the NIC pipeline to drop but the PHY stays connected / trained / synchronized.
