netdev - Re: [PATCH net v1] net: dsa: lantiq_gswip: fix and improve the unsupported interface error

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Date:   Sun, 7 Jun 2020 15:07:23 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        netdev@...r.kernel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v1] net: dsa: lantiq_gswip: fix and improve the
 unsupported interface error

On 6/7/20 3:02 PM, Martin Blumenstingl wrote:
> While trying to use the lantiq_gswip driver on one of my boards I made
> a mistake when specifying the phy-mode (because the out-of-tree driver
> wants phy-mode "gmii" or "mii" for the internal PHYs). In this case the
> following error is printed multiple times:
>   Unsupported interface: 3
> 
> While it gives at least a hint at what may be wrong it is not very user
> friendly. Print the human readable phy-mode and also which port is
> configured incorrectly (this hardware supports ports 0..6) to improve
> the cases where someone made a mistake.
> 
> Fixes: 14fceff4771e51 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Acked-by: Hauke Mehrtens <hauke@...ke-m.de>

> ---
>  drivers/net/dsa/lantiq_gswip.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
> index cf6fa8fede33..521ebc072903 100644
> --- a/drivers/net/dsa/lantiq_gswip.c
> +++ b/drivers/net/dsa/lantiq_gswip.c
> @@ -1452,7 +1452,8 @@ static void gswip_phylink_validate(struct dsa_switch *ds, int port,
>  
>  unsupported:
>  	bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
> -	dev_err(ds->dev, "Unsupported interface: %d\n", state->interface);
> +	dev_err(ds->dev, "Unsupported interface '%s' for port %d\n",
> +		phy_modes(state->interface), port);
>  	return;
>  }
>  
>