netdev - Re: dsa: handling more than 1 cpu port

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Message-ID: <20161214103153.GC27370@lunn.ch>
Date:   Wed, 14 Dec 2016 11:31:53 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     John Crispin <john@...ozen.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: dsa: handling more than 1 cpu port

On Wed, Dec 14, 2016 at 11:01:54AM +0100, John Crispin wrote:
> Hi Andrew,
> 
> switches supported by qca8k have 2 gmacs that we can wire an external
> mii interface to. Usually this is used to wire 2 of the SoCs MACs to the
> switch. Thw switch itself is aware of one of the MACs being the cpu port
> and expects this to be port/mac0. Using the other will break the
> hardware offloading features.

Just to be sure here. There is no way to use the second port connected
to the CPU as a CPU port?

The Marvell chips do allow this. So i developed a proof of concept
which had a mapping between cpu ports and slave ports. slave port X
should you cpu port y for its traffic. This never got past proof of
concept. 

If this can be made to work for qca8k, i would prefer having this
general concept, than specific hacks for pass through.

	Andrew