netdev - Re: [PATCH net-next v6 2/7] net: dsa: Add DSA driver for Hirschmann Hellcreek switches

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Date:   Thu, 8 Oct 2020 14:49:27 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>,
        Kamil Alkhouri <kamil.alkhouri@...offenburg.de>,
        ilias.apalodimas@...aro.org
Subject: Re: [PATCH net-next v6 2/7] net: dsa: Add DSA driver for Hirschmann
 Hellcreek switches

On Tue, Oct 06, 2020 at 12:13:04PM +0200, Kurt Kanzenbach wrote:
> >> >> +static const struct hellcreek_platform_data de1soc_r1_pdata = {
> >> >> +	.num_ports	 = 4,
> >> >> +	.is_100_mbits	 = 1,
> >> >> +	.qbv_support	 = 1,
> >> >> +	.qbv_on_cpu_port = 1,
> >> >
> >> > Why does this matter?
> >> 
> >> Because Qbv on the CPU port is a feature and not all switch variants
> >> have that. It will matter as soon as TAPRIO is implemented.
> >
> > How do you plan to install a tc-taprio qdisc on the CPU port?
> 
> That's an issue to be sorted out.

Do you have a compelling use case for tc-taprio on the CPU port though?
I've been waiting for someone to put one on the table.
If it's just "nice to have", I don't think that DSA will change just to
accomodate that. The fact that the CPU port doesn't have a net device is
already pretty much the established behavior.