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Date:   Fri, 9 Dec 2022 16:14:26 +0200
From:   Vladimir Oltean <olteanv@gmail.com>
To:     Michael Walle <michael@walle.cc>
Cc:     Horatiu Vultur <horatiu.vultur@microchip.com>,
        Steen.Hegelund@microchip.com, UNGLinuxDriver@microchip.com,
        daniel.machon@microchip.com, davem@davemloft.net,
        edumazet@google.com, kuba@kernel.org, lars.povlsen@microchip.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, pabeni@redhat.com, richardcochran@gmail.com
Subject: Re: [PATCH net-next v3 4/4] net: lan966x: Add ptp trap rules
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On Fri, Dec 09, 2022 at 03:05:01PM +0100, Michael Walle wrote:
> Am 2022-12-09 13:56, schrieb Vladimir Oltean:
> > On Fri, Dec 09, 2022 at 01:58:57PM +0100, Horatiu Vultur wrote:
> > > > Does it also work out of the box with the following patch if
> > > > the interface is part of a bridge or do you still have to do
> > > > the tc magic from above?
> > > 
> > > You will still need to enable the TCAM using the tc command to have it
> > > working when the interface is part of the bridge.
> > 
> > FWIW, with ocelot (same VCAP mechanism), PTP traps work out of the box,
> > no need to use tc. Same goes for ocelot-8021q, which also uses the VCAP.
> > I wouldn't consider forcing the user to add any tc command in order for
> > packet timestamping to work properly.
> 
> +1
> Esp. because there is no warning. I.e. I tried this patch while
> the interface was added on a bridge and there was no error
> whatsoever. Also, you'd force the user to have that Kconfig option
> set.

Yup. What I said about Ocelot is also applicable to MRP traps, which
Horatiu added. No tc necessary there, either.