netdev - Re: [RFC PATCH net-next 2/3] flow_offload: restore ability to collect separate stats per action

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Message-ID: <1c0d0a0a-a74b-c887-d615-0f0c0d2e1b9a@solarflare.com>
Date:   Wed, 8 May 2019 18:07:15 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        "Cong Wang" <xiyou.wangcong@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "Anjali Singhai Jain" <anjali.singhai@...el.com>,
        Or Gerlitz <gerlitz.or@...il.com>
Subject: Re: [RFC PATCH net-next 2/3] flow_offload: restore ability to collect
 separate stats per action

On 08/05/2019 15:02, Jamal Hadi Salim wrote:
> The lazy thing most people have done is essentially assume that
> there is a stat per filter rule...
> I wouldnt call it the 'the right thing'
Yup, that's why I'm trying to not do that ;-)

> Yes, the index at tc semantics level is per-action type.
> So "mirred index 1" and "drop index 1" are not the same stats counter.
Ok, then that kills the design I used here that relied entirely on the
 index to specify counters.
I guess instead I'll have to go with the approach Pablo suggested,
 passing an array of struct flow_stats in the callback, thus using
 the index into that array (which corresponds to the index in
 f->exts->actions) to identify different counters.
Which means I will have to change all the existing drivers, which will
 largely revert (from the drivers' perspective) the change when Pablo
 took f->exts away from them — they will go back to calling something
 that looks a lot like tcf_exts_stats_update().
However, that'll mean the API has in-tree users, so it might be
 considered mergeable(?)

-Ed