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

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Message-ID: <0f82a785-b31c-0428-eb07-a9464a0c5ddd@phrozen.org>
Date:   Wed, 14 Dec 2016 11:35:30 +0100
From:   John Crispin <john@...ozen.org>
To:     Andrew Lunn <andrew@...n.ch>
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 14/12/2016 11:31, Andrew Lunn wrote:
> 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?

both macs are considered cpu ports and both allow for the tag to be
injected. for HW NAT/routing/... offloading to work, the lan ports neet
to trunk via port0 and not port6 however.

> 
> 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.

oh cool, can you send those patches my way please ? how do you configure
this from userland ? does the cpu port get its on swdev which i just add
to my lan bridge and then add the 2nd cpu port to the wan bridge ?

	John