linux-kernel - Re: [PATCH net-next v3] net: dsa: mv88e6xxx: control mdio bus-id truncation for long paths

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Date: Mon, 13 May 2024 08:32:25 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Josua Mayer <josua@...id-run.com>
Cc: Florian Fainelli <f.fainelli@...il.com>, Andrew Lunn <andrew@...n.ch>,
 Vladimir Oltean <olteanv@...il.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Mor Nagli
 <mor.nagli@...id-run.com>
Subject: Re: [PATCH net-next v3] net: dsa: mv88e6xxx: control mdio bus-id
 truncation for long paths

On Tue, 7 May 2024 12:03:31 +0000 Josua Mayer wrote:
> > The idea and implementation is reasonable but this could affect other drivers than mv88e6xxx, why not move that logic to mdiobus_register() and tracking the truncation index globally within the MDIO bus layer?  
> Conceptually I agree, it would be nice to have a centralized
> solution to this problem, it probably can occur in multiple places.
> 
> My reasoning is that solving the problem within a single driver
> is a much smaller task, especially for sporadic contributors
> who lack a deep understanding for how all layers interact.
> 
> Perhaps agreeing on a good solution within this driver
> can inform a more general solution to be added later.

I agree with Florian, FWIW. The choice of how to truncate is a bit
arbitrary, if core does it at least it will be consistent.