netdev - Re: [PATCH net 2/5] renesas: reject PTP_STRICT

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Message-ID: <20250318140319.GU688833@kernel.org>
Date: Tue, 18 Mar 2025 14:03:19 +0000
From: Simon Horman <horms@...nel.org>
To: Jacob Keller <jacob.e.keller@...el.com>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Ruud Bos <kernel.hbk@...il.com>,
	Paul Barker <paul.barker.ct@...renesas.com>,
	Niklas Söderlund <niklas.soderlund@...natech.se>,
	Bryan Whitehead <bryan.whitehead@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Jonathan Lemon <jonathan.lemon@...il.com>,
	Lasse Johnsen <l@...johnsen.me>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: Re: [PATCH net 2/5] renesas: reject PTP_STRICT_FLAGS as unsupported

On Tue, Mar 18, 2025 at 01:59:47PM +0000, Simon Horman wrote:
> + Shimoda-san
> 
> On Mon, Mar 10, 2025 at 03:16:37PM -0700, Jacob Keller wrote:
> > The ravb_ptp_extts() function checks the flags coming from the
> > PTP_EXTTS_REQUEST ioctl, to ensure that future flags are not accepted on
> > accident.
> > 
> > This was updated to 'honor' the PTP_STRICT_FLAGS in commit 6138e687c7b6
> > ("ptp: Introduce strict checking of external time stamp options.").
> > However, the driver does not *actually* validate the flags.
> > 
> > I originally fixed this driver to reject future flags in commit
> > 592025a03b34 ("renesas: reject unsupported external timestamp flags"). It
> > is still unclear whether this hardware timestamps the rising, falling, or
> > both edges of the input signal.
> > 
> > Accepting requests with PTP_STRICT_FLAGS is a bug, as this could lead to
> > users mistakenly assuming a request with PTP_RISING_EDGE actually
> > timestamps the rising edge only.
> > 
> > Reject requests with PTP_STRICT_FLAGS (and hence all PTP_EXTTS_REQUEST2
> > requests) until someone with access to the datasheet or hardware knowledge
> > can confirm the timestamping behavior and update this driver.
> > 
> > Fixes: 6138e687c7b6 ("ptp: Introduce strict checking of external time stamp options.")
> > Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> 
> Adding Shimoda-san who may be able to help coordinate a review if
> Niklas and Paul are unavailable for some reason.

Sorry for the noise. I now see that Niklas has reviewed v2.