netdev - Re: [PATCH RFC net-next 1/3] net: dsa: allow for multiple CPU ports

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Message-ID: <20190824194145.70715ab1@nic.cz>
Date:   Sat, 24 Aug 2019 19:41:45 +0200
From:   Marek Behun <marek.behun@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     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 1/3] net: dsa: allow for multiple CPU ports

On Sat, 24 Aug 2019 17:43:02 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> But i don't know if it is worth the effort. I've never seen a D in DSA
> setup with multiple CPUs ports. I've only ever seen an single switch
> with multiple CPU ports.

Yes, that exactly. I was thinking about the most optimal algorithm, but
such would need to consider speeds between links too. For example the
DSA port between two switches can be linked at 1 GB, but cpu can be
connected to switch with 2.5G. What assignment is best in that case?

I think that we should try to solve such issue when it arises, if ever.
Such cases are more reason to add the ability to change cpu ports for
given ports.

Marek