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

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Date:   Mon, 13 Jan 2020 11:42:03 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Alexander Lobakin <alobakin@...nk.ru>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Edward Cree <ecree@...arflare.com>,
        Andrew Lunn <andrew@...n.ch>,
        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 <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH RFC net-next 05/19] net: dsa: tag_ar9331: add GRO callbacks

Hi Alexander,

On Mon, 13 Jan 2020 at 11:22, Alexander Lobakin <alobakin@...nk.ru> wrote:
>
> CPU ports can't be bridged anyway
>
> Regards,
> ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ

The fact that CPU ports can't be bridged is already not ideal.
One can have a DSA switch with cascaded switches on each port, so it
acts like N DSA masters (not as DSA links, since the taggers are
incompatible), with each switch forming its own tree. It is desirable
that the ports of the DSA switch on top are bridged, so that
forwarding between cascaded switches does not pass through the CPU.

-Vladimir