linux-kernel - Re: [PATCH net-next v3 6/7] ethtool: add interface to interact with Ethernet Power Equipment

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Date:   Sun, 28 Aug 2022 08:16:28 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        kernel test robot <lkp@...el.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        David Jander <david@...tonic.nl>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next v3 6/7] ethtool: add interface to interact with
 Ethernet Power Equipment

On Sat, Aug 27, 2022 at 08:38:34PM +0200, Andrew Lunn wrote:
> > +static int pse_set_pse_config(struct net_device *dev,
> > +			      struct netlink_ext_ack *extack,
> > +			      struct nlattr **tb)
> > +{
> > +	struct phy_device *phydev = dev->phydev;
> > +	struct pse_control_config config = {};
> > +	int ret;
> > +
> > +	if (!tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL])
> > +		return -EINVAL;
> 
> I would make use of extack here, and report what is missing.
> 
> > +
> > +	config.admin_cotrol = nla_get_u8(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
> 
> It would be good to have some basic validation here, make sure user
> space has passed a reasonable value.

this values are already validate by the ethnl_pse_set_policy

> You should also define what 0 and
> ETHTOOL_A_PODL_PSE_ADMIN_CONTROL_UNKNOWN means here when passed in. In
> future, there could be additional things which could be configured, so
> struct pse_control_config gets additional members.
> ETHTOOL_A_PODL_PSE_ADMIN_CONTROL appears to be mandatory, you return
> -EVINAL if missing, so if you don't want to change it, but change some
> other new thing, maybe 0 should be passed here? And the driver should
> not consider it an error?

ack. changed to 0 and added comment.

> ETHTOOL_A_PODL_PSE_ADMIN_CONTROL_UNKNOWN
> however seems invalid and so should be rejected here?

yes. it is already rejected. I added comment to make it more visible

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