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

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Date:   Mon, 05 Jul 2021 11:08:07 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
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

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.

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.

-- 
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