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

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Message-ID: <20211105142833.nv56zd5bqrkyjepd@skbuf>
Date:   Fri, 5 Nov 2021 16:28:33 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Martin Kaistra <martin.kaistra@...utronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        "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 05, 2021 at 07:13:19AM -0700, Richard Cochran wrote:
> On Fri, Nov 05, 2021 at 02:38:01PM +0100, Martin Kaistra wrote:
> > Ok, then I will remove HWTSTAMP_FILTER_PTP_V2_(EVENT|SYNC|DELAY_REQ) from
> > this list, what about HWTSTAMP_FILTER_ALL?
> 
> AKK means time stamp every received frame, so your driver should
> return an error in this case as well.

What is the expected convention exactly? There are other drivers that
downgrade the user application's request to what they support, and at
least ptp4l does not error out, it just prints a warning.