linux-kernel - Re: [PATCH net-next 2/2] net: stmmac: dwmac-socfpga: Set interface modes from Lynx PCS as supported

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Message-ID: <20241217135932.60711288@fedora.home>
Date: Tue, 17 Dec 2024 13:59:32 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, Alexandre Torgue
 <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, Andrew
 Lunn <andrew+netdev@...n.ch>, davem@...emloft.net, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Maxime Coquelin
 <mcoquelin.stm32@...il.com>, Alexis Lothoré
 <alexis.lothore@...tlin.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] net: stmmac: dwmac-socfpga: Set interface
 modes from Lynx PCS as supported

Hi Jakub,

On Mon, 16 Dec 2024 17:33:33 -0800
Jakub Kicinski <kuba@...nel.org> wrote:

> On Mon, 16 Dec 2024 09:42:24 +0100 Maxime Chevallier wrote:
> > > I've actually already created that series!    
> > 
> > Woaw that was fast ! I'll review and give it a test on my setup then.
> > 
> > Maybe one thing to clarify with the net maintainers is that this work
> > you've done doesn't replace the series this thread is replying to,
> > which still makes sense (we need the
> > stmmac_priv->phylink_config.supported_interfaces to be correctly
> > populated on socfpga).  
> 
> Ah, sorry. Should have asked. 
> 
> I assumed since Lynx PCS will have the SGMII and 1000BASEX set -
> Russell's patch 5 will copy them for you to
> priv->phylink_config.supported_interfaces. Your patch 1 is still needed.
> Did I get it wrong?

Both are needed actually :) There are 2 issues on socfpga :

 - 1000BaseX needs to be understood by the socfpga wrapper
(dwmac-socfpga) so that the internal serdes is enabled in the wrapper,
that would be patch 1

- The priv->phylink_config.supported_interfaces is incomplete on
dwmac-socfpga. Russell's patch 5 intersects these modes with that the
PCS supports :

+		phy_interface_or(priv->phylink_config.supported_interfaces,
+				 priv->phylink_config.supported_interfaces,
+				 pcs->supported_interfaces);

So without patch 2 in the series, we'll be missing
PHY_INTERFACE_MODE_1000BASEX in the end result :)

Thanks,

Maxime