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: <20241217064907.0e509769@kernel.org>
Date: Tue, 17 Dec 2024 06:49:07 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
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

Let me triple check ;)

On Tue, 17 Dec 2024 13:59:32 +0100 Maxime Chevallier wrote:
> - 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 :)

"Or" is a sum/union, not intersection.

You set the bits in priv->phylink_config.supported_interfaces.
Russell does:

	priv->phylink_config.supported_interfaces |=
		pcs->supported_interfaces;

If I'm missing the point please repost once Russell's patches 
are merged :)