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

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Date:   Fri, 9 Dec 2022 16:56:37 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.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

On Fri, Dec 09, 2022 at 03:57:20PM +0100, Horatiu Vultur wrote:
> 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.

I don't understand, tc rules which do what? Why would those rules only
be hit after PTP is enabled and not before?