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

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Date:   Mon, 13 Jan 2020 12:28:09 +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

On Mon, 13 Jan 2020 at 11:46, Alexander Lobakin <alobakin@...nk.ru> wrote:
>
> 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.
>

I just wanted to point out that some people are going to be looking at
ways by which the ETH_P_XDSA handler can be made to play nice with the
master's rx_handler, and that it would be nice to at least not make
the limitation worse than it is by converting everything to
rx_handlers (which "currently" can't be stacked, from the comments in
netdevice.h).

> > -Vladimir
>
> Regards,
> ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ