linux-kernel - Re: [PATCH v8 net-next 06/12] net: fec: convert to ndo_hwtstamp_get() and ndo_hwtstamp

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Message-ID: <20230801131254.xzc3xppbwftdj6it@skbuf>
Date:   Tue, 1 Aug 2023 16:12:54 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Maxim Georgiev <glipus@...il.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Köry Maincent <kory.maincent@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Richard Cochran <richardcochran@...il.com>,
        Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
        Gerhard Engleder <gerhard@...leder-embedded.com>,
        Hangbin Liu <liuhangbin@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Wei Fang <wei.fang@....com>,
        Shenwei Wang <shenwei.wang@....com>,
        Clark Wang <xiaoning.wang@....com>,
        NXP Linux Team <linux-imx@....com>,
        UNGLinuxDriver@...rochip.com,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Daniel Machon <daniel.machon@...rochip.com>,
        Simon Horman <simon.horman@...igine.com>,
        Casper Andersson <casper.casan@...il.com>,
        Sergey Organov <sorganov@...il.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 net-next 06/12] net: fec: convert to
 ndo_hwtstamp_get() and ndo_hwtstamp_set()

On Tue, Jul 18, 2023 at 03:20:13PM +0100, Russell King (Oracle) wrote:
> > +static int fec_hwtstamp_get(struct net_device *ndev,
> > +			    struct kernel_hwtstamp_config *config)
> > +{
> > +	struct fec_enet_private *fep = netdev_priv(ndev);
> > +	struct phy_device *phydev = ndev->phydev;
> > +
> > +	if (phy_has_hwtstamp(phydev))
> > +		return phy_mii_ioctl(phydev, config->ifr, SIOCGHWTSTAMP);
> > +
> > +	if (!fep->bufdesc_ex)
> > +		return -EOPNOTSUPP;
> 
> If the interface hasn't been brought up at least once, then phydev
> here will be NULL, and we'll drop through to this test. If the FEC
> doesn't support extended buffer descriptors, userspace will see
> -EOPNOTSUPP rather than -EINVAL. This could be misleading to userspace.
> 
> Does this need something like:
> 
> 	if (!netif_running(ndev))
> 		return -EINVAL;
> 
> before, or maybe just after phy_has_hwtstamp() to give equivalent
> behaviour?
> 
> > +static int fec_hwtstamp_set(struct net_device *ndev,
> > +			    struct kernel_hwtstamp_config *config,
> > +			    struct netlink_ext_ack *extack)
> > +{
> > +	struct fec_enet_private *fep = netdev_priv(ndev);
> > +	struct phy_device *phydev = ndev->phydev;
> > +
> > +	if (phy_has_hwtstamp(phydev)) {
> > +		fec_ptp_disable_hwts(ndev);
> > +
> > +		return phy_mii_ioctl(phydev, config->ifr, SIOCSHWTSTAMP);
> > +	}
> > +
> > +	if (!fep->bufdesc_ex)
> > +		return -EOPNOTSUPP;
> 
> Same comment here.

I will add back the netif_running() check to continue to not permit the
operation to go through, as before.