netdev - Re: [patch net-next 07/12] mlxsw: spectrum: Add the multicast routing offloading logic

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Message-ID: <20170923144112.GB21228@lunn.ch>
Date:   Sat, 23 Sep 2017 16:41:12 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Yotam Gigi <yotamg@...lanox.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch net-next 07/12] mlxsw: spectrum: Add the multicast
 routing offloading logic

> > So when i look at these patches, i try to make sure the general use
> > cases works, not just the plain boring Ethernet switch box use cases
> > :-)
> 
> So when doing it, we did think about multi-ASIC situations, so I think it should
> fit :)

Maybe, maybe not. DSA is multi switch. That is what the D means,
Distributed. All switches in a cluster are presented to the software
stack as a single switch.

If your multi-ASIC architecture is the same, a distributed switch,
then you don't cover the general case. If you represent it as two
switches, with frames going between switches going via CPU, then yes,
you probably cover the general case.

    Andrew