netdev - Re: [PATCH 1/7] net/dsa: configure autoneg for CPU port

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Message-ID: <20190910182635.GA9761@lunn.ch>
Date:   Tue, 10 Sep 2019 20:26:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Robert Beckett <bob.beckett@...labora.com>
Cc:     netdev@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/7] net/dsa: configure autoneg for CPU port

On Tue, Sep 10, 2019 at 04:41:47PM +0100, Robert Beckett wrote:
> This enables us to negoatiate pause frame transmission to prioritise
> packet delivery over throughput.

I don't think we can unconditionally enable this. It is a big
behaviour change, and it is likely to break running systems. It has
affects on QoS, packet prioritisation, etc.

I think there needs to be a configuration knob. But unfortunately, i
don't know of a good place to put this knob. The switch CPU port is
not visible in any way.

    Andrew