linux-kernel - Re: [PATCH 7/7] net: dsa: b53: Expose PTP timestamping ioctls to userspace

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Message-ID: <20211126171818.bvlxjoz7hu5w7bi5@skbuf>
Date:   Fri, 26 Nov 2021 19:18:18 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Kurt Kanzenbach <kurt@...utronix.de>,
        Martin Kaistra <martin.kaistra@...utronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 7/7] net: dsa: b53: Expose PTP timestamping ioctls to
 userspace

On Fri, Nov 26, 2021 at 09:03:48AM -0800, Richard Cochran wrote:
> On Fri, Nov 26, 2021 at 06:42:57PM +0200, Vladimir Oltean wrote:
> > I'm still missing something obvious, aren't I?
> 
> You said there are "many more" drivers with this bug, but I'm saying
> that most drivers correctly upgrade the ioctl request.
> 
> So far we have b53 and ocelot doing the buggy downgrade.  I guess it
> will require a tree wide audit to discover the "many more"...

Ah, yes, I assure you that there are many more drivers doing wacky
stuff, for example sja1105 will take any RX filter that isn't NONE, and
then reports it back as PTP_V2_L2_EVENT.
https://elixir.bootlin.com/linux/latest/source/drivers/net/dsa/sja1105/sja1105_ptp.c#L89

Somehow at this stage I don't even want to know about any other drivers,
since I might feel the urge to patch them and I don't really have the
necessary free time for that right now :D