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

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Message-ID: <20200430043751.ojvcgtubkbfunolb@pengutronix.de>
Date:   Thu, 30 Apr 2020 06:37:51 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Michal Kubecek <mkubecek@...e.cz>, Marek Vasut <marex@...x.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonathan Corbet <corbet@....net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        mkl@...gutronix.de, kernel@...gutronix.de,
        David Jander <david@...tonic.nl>,
        Jakub Kicinski <kuba@...nel.org>,
        Christian Herber <christian.herber@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net-next v3 1/2] ethtool: provide UAPI for PHY
 master/slave configuration.

Hi Andrew,

On Wed, Apr 29, 2020 at 08:16:14PM +0200, Andrew Lunn wrote:
> 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 :-(

Not problem.
Interesting, what is wrong with FEC? We use it a lot.

> > --- 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.

ok

> >  
> >  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?

ok

> > 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? 

Yes, otherwise we get a lot of "defined but not used " warnings.


Regards,
Oleksij
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