linux-kernel - Re: [PATCH net-next v3 1/2] ethtool: provide UAPI for PHY master/slave configuration.

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Date:   Wed, 29 Apr 2020 20:16:14 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Kubecek <mkubecek@...e.cz>,
        David Jander <david@...tonic.nl>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>, mkl@...gutronix.de,
        Marek Vasut <marex@...x.de>,
        Christian Herber <christian.herber@....com>
Subject: Re: [PATCH net-next v3 1/2] ethtool: provide UAPI for PHY
 master/slave configuration.

On Tue, Apr 28, 2020 at 09:53:07AM +0200, Oleksij Rempel wrote:

Hi Oleksij

Sorry for taking a while to review this. I was busy fixing the FEC
driver which i broke :-(

> --- a/Documentation/networking/ethtool-netlink.rst
> +++ b/Documentation/networking/ethtool-netlink.rst
> @@ -399,6 +399,8 @@ Kernel response contents:
>    ``ETHTOOL_A_LINKMODES_PEER``          bitset  partner link modes
>    ``ETHTOOL_A_LINKMODES_SPEED``         u32     link speed (Mb/s)
>    ``ETHTOOL_A_LINKMODES_DUPLEX``        u8      duplex mode
> +  ``ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG``  u8      Master/slave port mode
> +  ``ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE``  u8      Master/slave port mode
>    ====================================  ======  ==========================

I've not used Sphinx for a while. But it used to be, tables had to be
correctly aligned. I think you need to pad the other rows with spaces.

Also, the comments should differ. The first is how we want it
configured, the second is the current state.

>  
>  For ``ETHTOOL_A_LINKMODES_OURS``, value represents advertised modes and mask
> @@ -421,6 +423,7 @@ Request contents:
>    ``ETHTOOL_A_LINKMODES_PEER``          bitset  partner link modes
>    ``ETHTOOL_A_LINKMODES_SPEED``         u32     link speed (Mb/s)
>    ``ETHTOOL_A_LINKMODES_DUPLEX``        u8      duplex mode
> +  ``ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG``  u8      Master/slave port mode
>    ====================================  ======  ==========================

Same table cleanup needed here.

> +static int genphy_read_master_slave(struct phy_device *phydev)
> +{
> +	int cfg, state = 0;
> +	u16 val;
> +
> +	phydev->master_slave_get = 0;
> +	phydev->master_slave_state = 0;

Could you use the _UNKNOWN #defined here?

> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
> index 92f737f101178..eb680e3d6bda5 100644
> --- a/include/uapi/linux/ethtool.h
> +++ b/include/uapi/linux/ethtool.h
> @@ -1666,6 +1666,31 @@ static inline int ethtool_validate_duplex(__u8 duplex)
>  	return 0;
>  }
>  
> +static inline int ethtool_validate_master_slave_cfg(__u8 cfg)
> +{
> +	switch (cfg) {
> +	case PORT_MODE_CFG_MASTER_PREFERRED:
> +	case PORT_MODE_CFG_SLAVE_PREFERRED:
> +	case PORT_MODE_CFG_MASTER_FORCE:
> +	case PORT_MODE_CFG_SLAVE_FORCE:
> +	case PORT_MODE_CFG_UNKNOWN:
> +		return 1;
> +	}
> +
> +	return 0;
> +}

Does this need to be an inline function? 

     Andrew