netdev - Re: [PATCH 04/24] rtw89: add debug files

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Date:   Mon, 5 Jul 2021 11:23:03 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Brian Norris <briannorris@...omium.org>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        netdev@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 04/24] rtw89: add debug files

On Mon, Jul 05, 2021 at 11:08:07AM +0300, Kalle Valo wrote:
> Oleksij Rempel <o.rempel@...gutronix.de> writes:
> 
> > On Fri, Jul 02, 2021 at 10:08:53AM -0700, Brian Norris wrote:
> >> On Fri, Jul 2, 2021 at 12:23 AM Oleksij Rempel <o.rempel@...gutronix.de> wrote:
> >> > On Fri, Jun 18, 2021 at 02:46:05PM +0800, Ping-Ke Shih wrote:
> >> > > +#ifdef CONFIG_RTW89_DEBUGMSG
> >> > > +unsigned int rtw89_debug_mask;
> >> > > +EXPORT_SYMBOL(rtw89_debug_mask);
> >> > > +module_param_named(debug_mask, rtw89_debug_mask, uint, 0644);
> >> > > +MODULE_PARM_DESC(debug_mask, "Debugging mask");
> >> > > +#endif
> >> >
> >> >
> >> > For dynamic debugging we usually use ethtool msglvl.
> >> > Please, convert all dev_err/warn/inf.... to netif_ counterparts
> >> 
> >> Have you ever looked at a WiFi driver?
> >
> > Yes. You can parse the kernel log for my commits.
> >
> >> I haven't seen a single one that uses netif_*() for logging.
> >> On the other hand, almost every
> >> single one has a similar module parameter or debugfs knob for enabling
> >> different types of debug messages.
> >> 
> >> As it stands, the NETIF_* categories don't really align at all with
> >> the kinds of message categories most WiFi drivers support. Do you
> >> propose adding a bunch of new options to the netif debug feature?
> >
> > Why not? It make no sense or it is just "it is tradition, we never do
> > it!" ? 
> >
> > Even dynamic printk provide even more granularity. So module parameter looks
> > like stone age against all existing possibilities.
> 
> I'm all for improving wireless driver debugging features, but let's
> please keep that as a separate thread from reviewing new drivers. I
> think there are 4-5 new drivers in the queue at the moment so to keep
> all this manageable let's have the review process as simple as possible,
> please.

Ok, there is enough work to do.

> Using a module parameter for setting the debug mask is a standard
> feature in wireless drivers so it shouldn't block rtw89. If we want a
> generic debug framework for wireless drivers, an rfc patch for an
> existing upstream wireless driver is a good way to get that discussion
> forward.

Ok, sounds good.

Regards,
Oleksij
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