netdev - Re: [RFC PATCH net-next v3 01/13] net: phy: Introduce ethernet link topology representation

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Date: Tue, 12 Dec 2023 14:10:26 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Simon Horman <horms@...nel.org>, davem@...emloft.net,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 thomas.petazzoni@...tlin.com, Jakub Kicinski <kuba@...nel.org>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Russell
 King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org,
 Christophe Leroy <christophe.leroy@...roup.eu>, Herve Codina
 <herve.codina@...tlin.com>, Florian Fainelli <f.fainelli@...il.com>, Heiner
 Kallweit <hkallweit1@...il.com>, Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>, Jesse Brandeburg
 <jesse.brandeburg@...el.com>, Jonathan Corbet <corbet@....net>, Marek
 Behún <kabel@...nel.org>, Piergiorgio Beruto
 <piergiorgio.beruto@...il.com>, Oleksij Rempel <o.rempel@...gutronix.de>,
 Nicolò Veronese <nicveronese@...il.com>
Subject: Re: [RFC PATCH net-next v3 01/13] net: phy: Introduce ethernet link
 topology representation

On Mon, 11 Dec 2023 15:09:09 +0100
Andrew Lunn <andrew@...n.ch> wrote:

> > > > @@ -10832,6 +10833,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
> > > >  #ifdef CONFIG_NET_SCHED
> > > >  	hash_init(dev->qdisc_hash);
> > > >  #endif
> > > > +	phy_link_topo_init(&dev->link_topo);
> > > > +    
> > > 
> > > I don't think this can work unless PHYLIB is compiled as a built-in.  
> > 
> > Inded, I need to better clarify and document the dependency with
> > PHYLIB.  
> 
> It is getting harder and harder to make the phylib core a module :-(
> 
> How much work does phy_link_topo_init() do? Could it be an inline
> function? Are there other dependencies?

Sorry about that, I'll make sure it works with phylib entirely disabled
for next version. I try to keep the integration with net_device minimal
and avoid any dependency bloat, we don't need much besides xarray stuff
(hence the fact there are 2 headers, the phy_link_topology_core.h
containing the bare minimum), but I did miss that.

> Also look at ethtool_phy_ops and e.g. how plca_get_cfg_prepare_data()
> uses it.

Thanks, indeed that's a good example. I'll also address that in the
netlink part as well.

Thanks,

Maxime