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

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Message-ID: <20221209144723.qdbf2wr6vp2dmty7@skbuf>
Date:   Fri, 9 Dec 2022 16:47:23 +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 04:43:28PM +0200, 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. It's simply
> too unfriendly for somebody who just wants PTP. You can use devlink
> traps to show which non-tc traps are active.

To put it differently. Why do you even bother to make the driver
auto-install PTP traps, and not let the user do that? It's the same
argument as asking the user enable the VCAP lookups.