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

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Date:   Fri, 9 Dec 2022 15:57:20 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     Michael Walle <michael@...le.cc>, <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

The 12/09/2022 16:43, Vladimir Oltean wrote:
> 
> On Fri, Dec 09, 2022 at 03:20:58PM +0100, Horatiu Vultur wrote:
> > On ocelot, the vcap is enabled at port initialization, while on other
> > platforms(lan966x and sparx5) you have the option to enable or disable.
> 
> Even if that wasn't the case, I'd still consider enabling/disabling VCAP
> lookups privately in the ocelot driver when there are non-tc users of
> traps, instead of requiring users to do anything with tc.

I was thinking also about this, such the ptp to enable the VCAP
privately. But then the issue would be if a user adds entries using tc
and then start ptp, then suddently the rules that were added using tc
could be hit. That is the reason why expected the user to enable the
tcam manually.

> It's simply too unfriendly for somebody who just wants PTP. You can use
> devlink traps to show which non-tc traps are active.

-- 
/Horatiu