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Message-ID: <20230928121214.170e31b0@kmaincent-XPS-13-7390>
Date: Thu, 28 Sep 2023 12:12:14 +0200
From: Köry Maincent <kory.maincent@...tlin.com>
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>,
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Horatiu Vultur <horatiu.vultur@...rochip.com>,
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Richard Cochran <richardcochran@...il.com>,
Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
Gerhard Engleder <gerhard@...leder-embedded.com>,
Hangbin Liu <liuhangbin@...il.com>,
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Subject: Re: [PATCH v9 net-next 12/12] net: remove phy_has_hwtstamp() ->
phy_mii_ioctl() decision from converted drivers
On Tue, 1 Aug 2023 17:28:24 +0300
Vladimir Oltean <vladimir.oltean@....com> wrote:
> It is desirable that the new .ndo_hwtstamp_set() API gives more
> uniformity, less overhead and future flexibility w.r.t. the PHY
> timestamping behavior.
>
> Currently there are some drivers which allow PHY timestamping through
> the procedure mentioned in Documentation/networking/timestamping.rst.
> They don't do anything locally if phy_has_hwtstamp() is set, except for
> lan966x which installs PTP packet traps.
>
> Centralize that behavior in a new dev_set_hwtstamp_phylib() code
> function, which calls either phy_mii_ioctl() for the phylib PHY,
> or .ndo_hwtstamp_set() of the netdev, based on a single policy
> (currently simplistic: phy_has_hwtstamp()).
>
> Any driver converted to .ndo_hwtstamp_set() will automatically opt into
> the centralized phylib timestamping policy. Unconverted drivers still
> get to choose whether they let the PHY handle timestamping or not.
>
> Netdev drivers with integrated PHY drivers that don't use phylib
> presumably don't set dev->phydev, and those will always see
> HWTSTAMP_SOURCE_NETDEV requests even when converted. The timestamping
> policy will remain 100% up to them.
> +static int dev_set_hwtstamp_phylib(struct net_device *dev,
> + struct kernel_hwtstamp_config *cfg,
> + struct netlink_ext_ack *extack)
> +{
...
> + if (phy_ts) {
> + err = phy_hwtstamp_set(dev->phydev, cfg, extack);
> + if (err) {
> + if (changed)
> + ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
> + return err;
> + }
> + }
In this case the copy_from_user function will be call 2 times, one in
dev_set_hwtstamp and one in the mii_ts.hwtstamp callback of the PHY driver.
Should we create also a copied_from_user flag? Other idea?
Regards,
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