netdev - Re: [PATCH/RFC net-next] tc: allow drivers to accept gact with PIPE when offloading

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Date:   Tue, 29 Nov 2022 08:43:07 +0000
From:   Edward Cree <ecree.xilinx@...il.com>
To:     Marcelo Leitner <mleitner@...hat.com>,
        Tianyu Yuan <tianyu.yuan@...igine.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Simon Horman <simon.horman@...igine.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Davide Caratti <dcaratti@...hat.com>,
        Edward Cree <edward.cree@....com>,
        Eelco Chaudron <echaudro@...hat.com>,
        Ilya Maximets <i.maximets@....org>,
        Oz Shlomo <ozsh@...dia.com>, Paul Blakey <paulb@...dia.com>,
        Vlad Buslov <vladbu@...dia.com>,
        "dev@...nvswitch.org" <dev@...nvswitch.org>,
        oss-drivers <oss-drivers@...igine.com>,
        Ziyang Chen <ziyang.chen@...igine.com>
Subject: Re: [PATCH/RFC net-next] tc: allow drivers to accept gact with PIPE
 when offloading

On 28/11/2022 13:11, Marcelo Leitner wrote:
> Exactly. Then, when this patchset (or similar) come up, it won't
> update all actions with the same stats anymore. It will require a set
> of stats from hw for the gact with PIPE action here. But if drivers
> are ignoring this action, they can't have specific stats for it. Or am
> I missing something?
> 
> So it is better for the drivers to reject the whole flow instead of
> simply ignoring it, and let vswitchd probe if it should or should not
> use this action.

I agree.  Drivers should only accept a flow with a 'gact pipe' action
 if they are able to perform the stats offload it requests.
Getting userland to autodiscover whether it can make use of this is a
 SMOP, better than having it always try to use it and then sometimes
 get confused that the resulting stats are wrong or meaningless.

-ed