netdev - Re: Crosschip bridge functionality

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Message-ID: <Y6Yzp84WW1tQLdsB@lunn.ch>
Date:   Sat, 24 Dec 2022 00:03:03 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        netdev@...r.kernel.org
Subject: Re: Crosschip bridge functionality

> Fair question. We have a baseboard configuration with cards that offer
> customization / expansion. An example might be a card that offers
> additional fibre / copper ports, which would lend itself very nicely to
> a DSA configuration... more cards == more ports.
> 
> We can see some interesting use of vlans for all sorts of things. I
> haven't been the boots on the ground, so I don't know all the use-cases.
> My main hope is to be able to offer as much configurability for the
> system integrators as possible. Maybe sw2p2 is a tap of sw1p2, while
> sw2p3, sw2p4, and sw1p3 are bridged, with the CPU doing IGMP snooping
> and running RSTP.
> 
> > 
> > I know people have stacked switches before, and just operated them as
> > stacked switches. So you need to configure each switch independently.
> > What Marvell DSA does is make it transparent, so to some extent it
> > looks like one big switch, not a collection of switches.
> 
> That is definitely possible. It might make the people doing any system
> integration have a lot more knowledge than a simple "add this port to
> that bridge". My goal is to make their lives as easy as can be.
> 
> It sounds like that all exists with Marvell hardware...

You might want get hold of a Turris Mox system, with a few different
cards in it. That will give you a Marvell D in DSA system to play
with. And your system seems quite similar in some ways.

    Andrew