netdev - Re: [PATCH net-next 13/15] net: dsa: mt7530: add support for 10G link modes for CPU port

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Date:   Sat, 1 Apr 2023 14:05:48 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "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>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sam Shih <Sam.Shih@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>
Subject: Re: [PATCH net-next 13/15] net: dsa: mt7530: add support for 10G
 link modes for CPU port

On Sat, Apr 01, 2023 at 11:56:43AM +0300, Arınç ÜNAL wrote:
> On 30.03.2023 18:23, Daniel Golle wrote:
> > The built-in switch of the MT7988 SoC is internally connected using
> > a stateless 10G link. Add support for 10G interface modes to silence
> > a warning otherwise occurring when the switch driver is setup.
> > 
> > Reviewed-by: Andrew Lunn <andrew@...n.ch>
> > Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> > ---
> >   drivers/net/dsa/mt7530.c | 7 ++++++-
> >   1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> > index 3a4682e71e746..ac666da2d10dc 100644
> > --- a/drivers/net/dsa/mt7530.c
> > +++ b/drivers/net/dsa/mt7530.c
> > @@ -2618,6 +2618,9 @@ mt7531_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
> >   	case PHY_INTERFACE_MODE_1000BASEX:
> >   	case PHY_INTERFACE_MODE_2500BASEX:
> >   		/* handled in SGMII PCS driver */
> > +	case PHY_INTERFACE_MODE_USXGMII:
> > +	case PHY_INTERFACE_MODE_10GKR:
> > +		/* internal stateless 10G link */
> >   		return 0;
> >   	default:
> >   		return -EINVAL;
> 
> I think it'd be better to make this explicitly for the switch in the
> MT7988 SoC.

I decided to rather introduce mt7988_mac_config (a noop returning
either 0 or -EINVAL), mt7988_mac_port_get_caps (allowing only USXGMII
and 10000FD) and mt7988_cpu_port_config (setting CPU port bit in
registers but not caring about interface mode and speed other than
USXGMII/10000FD).

The updated commit adding MT7988 is here:
https://github.com/dangowrt/linux/commit/595c940cbee90b5dbdc8173974a007fefe641550

So then I dropped
"net: dsa: mt7530: add support for 10G link modes for CPU port"
because it is no longer needed if all this is done explicitely for MT7988.

> 
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index e5347dd2521b..f7542c7f60e4 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -2666,10 +2665,13 @@ mt7531_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
>  	case PHY_INTERFACE_MODE_1000BASEX:
>  	case PHY_INTERFACE_MODE_2500BASEX:
>  		/* handled in SGMII PCS driver */
> +		return 0;
>  	case PHY_INTERFACE_MODE_USXGMII:
>  	case PHY_INTERFACE_MODE_10GKR:
> -		/* internal stateless 10G link */
> -		return 0;
> +		if (priv->id == ID_MT7988)
> +			/* internal stateless 10G link */
> +			return 0;
> +
>  	default:
>  		return -EINVAL;
>  	}
> 
> Arınç