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Date:   Fri, 1 May 2020 22:52:12 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        "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>,
        David Jander <david@...tonic.nl>, kernel@...gutronix.de,
        linux-kernel@...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 v4 1/2] ethtool: provide UAPI for PHY
 master/slave configuration.

On Fri, May 01, 2020 at 05:52:10PM +0200, Michal Kubecek wrote:
> On Fri, May 01, 2020 at 09:46:32AM +0200, Oleksij Rempel wrote:
> [...]
> >  static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
> >  				  struct ethtool_link_ksettings *ksettings,
> >  				  bool *mod)
> >  {
> >  	struct ethtool_link_settings *lsettings = &ksettings->base;
> >  	bool req_speed, req_duplex;
> > +	const struct nlattr *attr;
> >  	int ret;
> >  
> > +	attr = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
> > +	if (attr) {
> 
> Introducing the variable makes little sense if this is the only place
> where it is used. But if you decide to use it also in the two other
> places working with the attribute, it should probably have more
> descriptive name.
> 
> Michal
> 
> > +		u8 cfg = nla_get_u8(tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]);
> > +		if (!ethnl_validate_master_slave_cfg(cfg))
> > +			return -EOPNOTSUPP;
> > +	}

Also, please set extack error message and bad attribute when the check
fails.

Michal

> > +
> >  	*mod = false;
> >  	req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
> >  	req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
> > @@ -311,6 +357,8 @@ static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
> >  			 mod);
> >  	ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
> >  			mod);
> > +	ethnl_update_u8(&lsettings->master_slave_cfg,
> > +			tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG], mod);
> >  
> >  	if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
> >  	    (req_speed || req_duplex) &&
> > -- 
> > 2.26.2
> > 

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