netdev - Re: [PATCH RFC net-next 05/19] net: dsa: tag

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Date:   Mon, 30 Dec 2019 21:36:16 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Alexander Lobakin <alobakin@...nk.ru>,
        "David S. Miller" <davem@...emloft.net>,
        Edward Cree <ecree@...arflare.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Taehee Yoo <ap420073@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Song Liu <songliubraving@...com>,
        Matteo Croce <mcroce@...hat.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Paul Blakey <paulb@...lanox.com>,
        Yoshiki Komachi <komachi.yoshiki@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC net-next 05/19] net: dsa: tag_ar9331: add GRO
 callbacks

On Mon, Dec 30, 2019 at 10:20:50AM -0800, Florian Fainelli wrote:
> On 12/30/19 6:30 AM, Alexander Lobakin wrote:
> > Add GRO callbacks to the AR9331 tagger so GRO layer can now process
> > such frames.
> > 
> > Signed-off-by: Alexander Lobakin <alobakin@...nk.ru>
> 
> This is a good example and we should probably build a tagger abstraction
> that is much simpler to fill in callbacks for (although indirect
> function calls may end-up killing performance with retpoline and
> friends), but let's consider this idea.

Hi Florian

We really do need some numbers here. Does GRO really help? On an ARM
or MIPS platform, i don't think retpoline is an issue? But x86 is, and
we do have a few x86 boards with switches.

Maybe we can do some macro magic instead of function pointers, if we
can keep it all within one object file?

    Andrew