linux-kernel - Re: [PATCH net-next v2 2/5] net: microchip: sparx5: Adding more tc flower keys for the IS2 VCAP

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Date:   Tue, 1 Nov 2022 08:31:16 +0100
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Casper Andersson <casper.casan@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        <UNGLinuxDriver@...rochip.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        "Wan Jiabing" <wanjiabing@...o.com>,
        Nathan Huckleberry <nhuck@...gle.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Daniel Machon <daniel.machon@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Subject: Re: [PATCH net-next v2 2/5] net: microchip: sparx5: Adding more tc
 flower keys for the IS2 VCAP

Hi Jacub,


On Mon, 2022-10-31 at 18:41 -0700, Jakub Kicinski wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Mon, 31 Oct 2022 13:14:33 +0100 Steen Hegelund wrote:
> > > I'm not able to get this working on PCB135. I tested the VLAN tags and
> > > did not work either (did not test the rest). The example from the
> > > previous patch series doesn't work either after applying this series.
> 
> Previous series in this context means previous revision or something
> that was already merged?

Casper refers to this series (the first of the VCAP related series) that was merged on Oct 24th:

https://lore.kernel.org/all/20221020130904.1215072-1-steen.hegelund@microchip.com/

> 
> > tc filter add dev eth3 ingress chain 8000000 prio 10 handle 10 \
> 
> How are you using chains?

The chain ids are referring to the VCAP instances and their lookups.  There are some more details
about this in the series I referred to above.

The short version is that this allows you to select where in the frame processing flow your rule
will be inserted (using ingress or egress and the chain id).

> 
> I thought you need to offload FLOW_ACTION_GOTO to get to a chain,
> and I get no hits on this driver.

I have not yet added the goto action, but one use of that is to chain a filter from one VCAP
instance/lookup to another.

The goto action will be added in a soon-to-come series.  I just wanted to avoid a series getting too
large, but on the other hand each of them should provide functionality that you can use in practice.

BR
Steen