Re: [EXT] Re: [PATCH v2] wifi: mwifiex: avoid AP and STA running on different channel

Sascha Hauer
2024-09-10T08:07:48Z

On Tue, Sep 10, 2024 at 07:28:29AM +0000, David Lin wrote:
> > From: Sascha Hauer <s.hauer@pengutronix.de>
> > Sent: Tuesday, September 10, 2024 3:22 PM
> > To: David Lin <yu-hao.lin@nxp.com>
> > Cc: linux-wireless@vger.kernel.org; linux-kernel@vger.kernel.org;
> > briannorris@chromium.org; kvalo@kernel.org; francesco@dolcini.it; Pete
> > Hsieh <tsung-hsien.hsieh@nxp.com>
> > Subject: Re: [EXT] Re: [PATCH v2] wifi: mwifiex: avoid AP and STA running on
> > different channel
> >
> > Caution: This is an external email. Please take care when clicking links or
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> >
> >
> > On Tue, Sep 10, 2024 at 06:18:57AM +0000, David Lin wrote:
> > > > > > > > With DRCS support enabled AP and STA actually can run on
> > > > > > > > different channels with the current code. You are breaking
> > > > > > > > this scenario with this
> > > > > > patch.
> > > > > > > >
> > > > > > > > Sascha
> > > > > > > >
> > > > > > >
> > > > > > > DRCS will be checked in the future.
> > > > > >
> > > > > > By future you mean v3 of this patch?
> > > > > >
> > > > > > Sascha
> > > > > >
> > > > >
> > > > > No schedule now.
> > > >
> > > > I am getting confused now. You want us to abandon my patch in favour
> > > > of yours, but you have no plans to update your patch to avoid a
> > > > regression that you introduce with your patch?
> > > >
> > > > Sascha
> > > >
> > >
> > > My patch resolves the same issue as your patch. But your patch can't
> > > let AP and STA run on the same channel if some wiphy parameters are
> > > set.
> > >
> > > I wonder did you test your patch?
> >
> > I finally see what you mean with "some wiphy parameters are set".
> > I did test my patch and I didn't run into this issue, because I haven't set
> > anything like rts_threshold in my config.
> >
> > Nevertheless what I am trying to tell you in this thread is: Your patch
> > introduces a regression and needs an update.
> >
> > It's not about my patch or your patch, both are currently not suitable for
> > inclusion and the question is: will you update your patch?
> >
> > Sascha
> >
>
> Without DRCS, this patch can avoid firmware crash and this is the
> current plan for Mwifiex. It won't affect any existing features.

What I am trying to tell you: Your patch fixes one thing and breaks
another.

The current mwifiex driver *does* support DRCS when enabled with the
drcs=1 module parameter. With DRCS enabled the current driver *can*
successfully run an Accesspoint on one channel and a station on another
channel. You are breaking this with your patch.

Your mwifiex_is_channel_setting_allowable() needs this:

if (adapter->drcs_enabled)
return true;

Sascha

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