netdev - Re: [PATCH v2 net-next] r8169: Add values missing in @get

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Message-ID: <20150821235940.GA20313@electric-eye.fr.zoreil.com>
Date:	Sat, 22 Aug 2015 01:59:40 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Corinna Vinschen <vinschen@...hat.com>
Cc:	netdev@...r.kernel.org, Hayes Wang <hayeswang@...ltek.com>,
	Ivan Vecera <ivecera@...hat.com>,
	David Miller <davem@...emloft.net>,
	nic_swsd <nic_swsd@...ltek.com>
Subject: Re: [PATCH v2 net-next] r8169: Add values missing in @get_stats64
 from HW counters

Corinna Vinschen <vinschen@...hat.com> :
> On Aug 21 21:39, Francois Romieu wrote:
[...]
> > The code should propagate failure when both rtl8169_reset_counters and
> > rtl8169_update_counters fail.
> 
> This one I don't understand.  Neither failing to reset the counters nor
> failing to update the counters is fatal for the driver.  So far the
> (unchanged) rtl8169_update_counters doesn't even print a log message,

I wouldn't overestimate the value of log messages vs real status return.
Users can be quite unhappy with default settings that spam their logs
(it isn't a problem in open(), it's marginaly murphy plausible from
a periodic get_stats context).

The driver can't propagate errors from the current get_stats context
where rtl8169_update_counters is used. However it can be done in
open().

> while a failing reset in rtl8169_reset_counters now does.
> 
> Why is that not sufficent?

Because of the same reason(s) why this patch wants to improve things.

It isn't a showstopper.

-- 
Ueimor
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