linux-kernel - Re: [PATCH net-next v2 1/3] net: dsa: use slave device phydev

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Date:   Fri, 22 Sep 2017 22:03:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next v2 1/3] net: dsa: use slave device phydev

On Fri, Sep 22, 2017 at 03:40:43PM -0400, Vivien Didelot wrote:
> There is no need to store a phy_device in dsa_slave_priv since
> net_device already provides one. Simply s/p->phy/dev->phydev/.
> 
> While at it, return -ENODEV when it is NULL instead of -EOPNOTSUPP.

I just did a quick poll for calling phy_mii_ioctl(). ENODEV seems the
most popular, second to EINVAL. Marvell drivers all use EOPNOTSUPP.

>  static int dsa_slave_nway_reset(struct net_device *dev)
>  {
> -	struct dsa_slave_priv *p = netdev_priv(dev);
> +	if (!dev->phydev)
> +		return -ENODEV;
>  
> -	if (p->phy != NULL)
> -		return genphy_restart_aneg(p->phy);
> -
> -	return -EOPNOTSUPP;
> +	return genphy_restart_aneg(dev->phydev);
>  }

It looks like this can now be replaced with phy_ethtool_nway_reset().

It could be there are other phy_ethtool_ helpers which can be used,
now that we have phydev in ndev.

    Andrew