linux-kernel - Re: [PATCH net-next v3 4/4] net: lan966x: Add ptp trap rules

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Date:   Fri, 09 Dec 2022 15:05:01 +0100
From:   Michael Walle <michael@...le.cc>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Steen.Hegelund@...rochip.com, UNGLinuxDriver@...rochip.com,
        daniel.machon@...rochip.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, lars.povlsen@...rochip.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com, richardcochran@...il.com
Subject: Re: [PATCH net-next v3 4/4] net: lan966x: Add ptp trap rules

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.

-michael