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 11:56:43 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Daniel Golle <daniel@...rotopia.org>, 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>
Cc:     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 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.

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