netdev - Re: [PATCH RFC net-next 0/3] Multi-CPU DSA support

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Message-ID: <20190824195813.43349620@nic.cz>
Date:   Sat, 24 Aug 2019 19:58:13 +0200
From:   Marek Behun <marek.behun@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH RFC net-next 0/3] Multi-CPU DSA support

On Sat, 24 Aug 2019 17:56:36 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> I expect bad things will happen if frames are flooded to multiple CPU
> ports. For this to work, the whole switch design needs to support
> multiple CPU ports. I doubt this will work on any old switch.
> 
> Having a host interface connected to a user port of the switch is a
> completely different uses case, and not what this patchset is about.

In the next proposal I shall also add a guard to all DSA drivers, that
if more than one CPU port is set, the driver will not probe.

After that the next patch will try to add multi-CPU support to
mv88e6xxx (while removeing the guard for that driver).

qca8k should also be possible to do, since we used it in such a way in
openwrt. I shall look into that afterwards.

Marek