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

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Date:   Fri, 2 Oct 2020 11:15:27 +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 Fri, Oct 02, 2020 at 10:06:28AM +0200, Kurt Kanzenbach wrote:
> Hi Vladimir,
> 
> On Tue Sep 08 2020, Vladimir Oltean wrote:
> > 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 Honestly, Documentation/networking/dsa/dsa.rst is out of date by quite a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.
> 
> Maybe it would be good to document new flags when they're introduced :).

Yup, will definitely do that when I resend.

> >
> > 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.
> 
> Is this merged? I don't see it. Do I have to set
> `configure_vlan_while_not_filtering' explicitly to true for the next
> hellcreek version?

Yes, please set it to true. The refactoring change didn't get merged in
time, I don't want it to interfere with your series.

Thanks,
-Vladimir