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

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Date:   Mon, 13 Jan 2020 12:46:13 +0300
From:   Alexander Lobakin <alobakin@...nk.ru>
To:     Vladimir Oltean <olteanv@...il.com>
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

Vladimir Oltean wrote 13.01.2020 12:42:
> 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.

Oh, I see. But currently DSA infra forbids the adding DSA masters to
bridges IIRC. Can't name it good or bad decision, but was introduced
to prevent accidental packet flow breaking on DSA setups.

> -Vladimir

Regards,
ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ