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

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Message-ID: <20211108144824.GD7170@hoboy.vegasvil.org>
Date:   Mon, 8 Nov 2021 06:48:24 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Vladimir Oltean <olteanv@...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 Sun, Nov 07, 2021 at 04:27:03PM +0200, Vladimir Oltean wrote:
> On Sun, Nov 07, 2021 at 06:05:34AM -0800, Richard Cochran wrote:
> >         switch (cfg.rx_filter) {
> >         case HWTSTAMP_FILTER_NONE:
> >                 break;
> >         case HWTSTAMP_FILTER_ALL:
> >         case HWTSTAMP_FILTER_SOME:
> >         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
> >         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
> >         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
> >         case HWTSTAMP_FILTER_NTP_ALL:
> >         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
> >         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
> >         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
> >         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
> >         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
> >         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
> >         case HWTSTAMP_FILTER_PTP_V2_EVENT:
> >         case HWTSTAMP_FILTER_PTP_V2_SYNC:
> >         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
> >                 cfg.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
> >                 break;
> >         default:
> >                 mutex_unlock(&ocelot->ptp_lock);
> >                 return -ERANGE;
> >         }
> > 
> > That is essentially an upgrade to HWTSTAMP_FILTER_PTP_V2_EVENT.  The
> > change from ALL to HWTSTAMP_FILTER_PTP_V2_EVENT is probably a simple
> > oversight, and the driver can be easily fixed.
> > 
> > Thanks,
> > Richard
> 
> It's essentially the same pattern as what Martin is introducing for b53.

Uh, no it isn't.  The present patch has:

+       case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+       case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+       case HWTSTAMP_FILTER_PTP_V2_EVENT:
+       case HWTSTAMP_FILTER_PTP_V2_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+       case HWTSTAMP_FILTER_ALL:
+               config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;

There is an important difference between
HWTSTAMP_FILTER_PTP_V2_L2_EVENT and HWTSTAMP_FILTER_PTP_V2_EVENT

Notice the "L2" in there.

Thanks,
Richard