netdev - Re: [PATCH 1/7] net/dsa: configure autoneg for CPU port

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Date:   Tue, 10 Sep 2019 12:14:52 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Robert Beckett <bob.beckett@...labora.com>
Cc:     netdev@...r.kernel.org, Robert Beckett <bob.beckett@...labora.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/7] net/dsa: configure autoneg for CPU port

Hi Robert,

On Tue, 10 Sep 2019 16:41:47 +0100, Robert Beckett <bob.beckett@...labora.com> wrote:
> Configure autoneg for phy connected CPU ports.
> This allows us to use autoneg between the CPU port's phy and the link
> partner's phy.
> This enables us to negoatiate pause frame transmission to prioritise
> packet delivery over throughput.
> 
> Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
> ---
>  net/dsa/port.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/net/dsa/port.c b/net/dsa/port.c
> index f071acf2842b..1b6832eac2c5 100644
> --- a/net/dsa/port.c
> +++ b/net/dsa/port.c
> @@ -538,10 +538,20 @@ static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
>  		return PTR_ERR(phydev);
>  
>  	if (enable) {
> +		phydev->supported = PHY_GBIT_FEATURES | SUPPORTED_MII |
> +				    SUPPORTED_AUI | SUPPORTED_FIBRE |
> +				    SUPPORTED_BNC | SUPPORTED_Pause |
> +				    SUPPORTED_Asym_Pause;
> +		phydev->advertising = phydev->supported;
> +

This seems a bit intruisive to me. I'll get back to you.

>  		err = genphy_config_init(phydev);
>  		if (err < 0)
>  			goto err_put_dev;
>  
> +		err = genphy_config_aneg(phydev);
> +		if (err < 0)
> +			goto err_put_dev;
> +
>  		err = genphy_resume(phydev);
>  		if (err < 0)
>  			goto err_put_dev;