netdev - Re: [PATCH iwl-next v3 0/2] Add link_down_events counters to ixgbe and ice drivers

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Message-ID: <20250514074203.31b07788@kernel.org>
Date: Wed, 14 May 2025 07:42:03 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Szapar-Mudlaw, Martyna" <martyna.szapar-mudlaw@...ux.intel.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Subject: Re: [PATCH iwl-next v3 0/2] Add link_down_events counters to ixgbe
 and ice drivers

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.