netdev - Re: [PATCH net-next 2/3] net: pcs: pcs-mtk-lynxi: implement pcs_inband

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Message-ID: <Z3ZVYeT0vD85Srsd@shell.armlinux.org.uk>
Date: Thu, 2 Jan 2025 08:59:13 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Eric Woudstra <ericwouds@...il.com>
Cc: Daniel Golle <daniel@...rotopia.org>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Alexander Couzens <lynxis@...0.eu>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 2/3] net: pcs: pcs-mtk-lynxi: implement
 pcs_inband_caps() method

On Tue, Dec 17, 2024 at 08:49:58AM +0100, Eric Woudstra wrote:
> On 12/5/24 10:42 AM, Russell King (Oracle) wrote:
> > Report the PCS in-band capabilities to phylink for the LynxI PCS.
> > 
> > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > Reviewed-by: Daniel Golle <daniel@...rotopia.org>
> > ---
> >  drivers/net/pcs/pcs-mtk-lynxi.c | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/drivers/net/pcs/pcs-mtk-lynxi.c b/drivers/net/pcs/pcs-mtk-lynxi.c
> > index 4f63abe638c4..7de804535229 100644
> > --- a/drivers/net/pcs/pcs-mtk-lynxi.c
> > +++ b/drivers/net/pcs/pcs-mtk-lynxi.c
> > @@ -88,6 +88,21 @@ static struct mtk_pcs_lynxi *pcs_to_mtk_pcs_lynxi(struct phylink_pcs *pcs)
> >  	return container_of(pcs, struct mtk_pcs_lynxi, pcs);
> >  }
> >  
> > +static unsigned int mtk_pcs_lynxi_inband_caps(struct phylink_pcs *pcs,
> > +					      phy_interface_t interface)
> > +{
> > +	switch (interface) {
> > +	case PHY_INTERFACE_MODE_1000BASEX:
> > +	case PHY_INTERFACE_MODE_2500BASEX:
> 
> Isn't this the place now where to report to phylink, that this PCS does
> not support in-band at 2500base-x?

No - look at the arguments to this function. What arguments would this
function make a decision whether in-band is supported in any interface
mode?

The correct place is the .pcs_inband_caps(), which from reading the
code, I understood that in-band can be used at 2500base-X with this
PCS. See
https://patch.msgid.link/E1tJ8NR-006L5P-E3@rmk-PC.armlinux.org.uk
which was merged at the beginning of December, and if you are correct,
the patch was wrong.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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