netdev - Re: [PATCH net-next 4/4] net: dsa: set configure_vlan_while_not

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Date:   Tue, 8 Sep 2020 13:29:56 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
Cc:     davem@...emloft.net, f.fainelli@...il.com,
        vivien.didelot@...il.com, andrew@...n.ch, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 4/4] net: dsa: set
 configure_vlan_while_not_filtering to true by default

On Tue, Sep 08, 2020 at 12:14:12PM +0200, Kurt Kanzenbach wrote:
> On Mon Sep 07 2020, Vladimir Oltean wrote:
> > New drivers always seem to omit setting this flag, for some reason.
>
> Yes, because it's not well documented, or is it? Before writing the
> hellcreek DSA driver, I've read dsa.rst documentation to find out what
> callback function should to what. Did I miss something?

Honestly, Documentation/networking/dsa/dsa.rst is out of date by quite a
bit. And this trend of having boolean flags in struct dsa_switch started
after the documentation stopped being updated.

But I didn't say it's your fault for not setting the flag, it is easy to
miss, and that's what this patch is trying to improve.

> > So let's reverse the logic: the DSA core sets it by default to true
> > before the .setup() callback, and legacy drivers can turn it off. This
> > way, new drivers get the new behavior by default, unless they
> > explicitly set the flag to false, which is more obvious during review.
>
> Yeah, that behavior makes more sense to me. Thank you.

Ok, thanks.

-Vladimir