netdev - Re: [PATCH v8 net-next 12/12] net: remove phy_has_hwtstamp() -> phy_mii

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Date: Tue, 18 Jul 2023 15:38:27 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Vladimir Oltean <vladimir.oltean@....com>
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 12/12] net: remove phy_has_hwtstamp() ->
 phy_mii_ioctl() decision from converted drivers

On Mon, Jul 17, 2023 at 06:27:09PM +0300, Vladimir Oltean wrote:
> +static int dev_set_hwtstamp_phylib(struct net_device *dev,
> +				   struct kernel_hwtstamp_config *cfg,
> +				   struct netlink_ext_ack *extack)
> +{
> +	const struct net_device_ops *ops = dev->netdev_ops;
> +	bool phy_ts = phy_has_hwtstamp(dev->phydev);
> +	struct kernel_hwtstamp_config old_cfg = {};
> +	bool changed = false;
> +	int err;
> +
> +	cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
> +
> +	if (!phy_ts || (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS)) {

I suppose the idea here is that for something like mvpp2, which when we
have PTP support for Marvell PHYs in general will want to prefer to use
the MAC-based PTP rather than PHY-based, that driver needs to set
IFF_SEE_ALL_HWTSTAMP_REQUESTS so that the ndo timestamp ops always get
called? I didn't see this discussed in the commit message for this
patch.

Thanks.

-- 
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