linux-kernel - Re: [PATCH net-next v5 2/8] net: ethtool: plumb PHY stats to PHY drivers

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Message-ID: <20250108172456.522517ff@fedora.home>
Date: Wed, 8 Jan 2025 17:24:56 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, Jakub Kicinski
 <kuba@...nel.org>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Jonathan
 Corbet <corbet@....net>, kernel@...gutronix.de,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, Simon Horman
 <horms@...nel.org>, Russell King <linux@...linux.org.uk>,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH net-next v5 2/8] net: ethtool: plumb PHY stats to PHY
 drivers

Hi Andrew, Oleksij,

On Wed, 8 Jan 2025 17:03:25 +0100
Andrew Lunn <andrew@...n.ch> wrote:

> > On one side I need to address the request to handle phydev specific
> > thing withing the PHYlib framework. On other side, I can't do it without
> > openen a pandora box of build dependencies. It will be a new main-side-quest
> > to resolve build dependency of net/ethtool/ and PHYlib. The workaround is to
> > put this functions to the header.  
> 
> Yes, the code is like this because phylib can be a module, and when it
> is, you would end up with unresolved symbols if ethtool code is built
> in. There are circular dependence as well, if both ethtool and phylib
> are module. The inlines help solve this.
> 
> However, the number of these inline functions keeps growing. At some
> point, we might want a different solution. Maybe phylib needs to
> register a structure of ops with ethtool when it loads?

Isn't it already the case with the ethtool_phy_ops singleton ? Maybe we
can add wrap the get_phy_stats / get_link_ext_stats ops to the
ethtool_phy_ops ? My understanding was that this singleton served this
purpose.

Thanks,

Maxime