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

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Message-ID: <20150818214017.GA14914@electric-eye.fr.zoreil.com>
Date:	Tue, 18 Aug 2015 23:40:17 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Corinna Vinschen <vinschen@...hat.com>
Cc:	netdev@...r.kernel.org, nic_swsd@...ltek.com,
	Ivan Vecera <ivecera@...hat.com>
Subject: Re: [PATCH] r8169: Add values missing in @get_stats64 from HW
 counters

Corinna Vinschen <vinschen@...hat.com> :
> The r8169 driver collects statistical information returned by
> @get_stats64 by counting them in the driver itself, even though many
> (but not all) of the values are already collected by tally counters
> (TCs) in the NIC.  Some of these TC values are not returned by
> @get_stats64.  Especially the received multicast packages are missing
> from /proc/net/dev.
> Rectify this by fetching the TCs and returning them from
> rtl8169_get_stats64.

It is not exactly a some / many / not all / confused [*] picture
- get_stats64 provides software managed values
- ethtool provides hardware only values

[*] ok, rx_missed is kinda special.

> The counters collected in the driver obviously disappear as soon as the
> driver is unloaded so after a driver is loaded the counters always start
> at 0.  The TCs are only reset by a power cycle and there's no known way
> to reset them programatically. Without further considerations the values
> collected by the driver would not match up against the TC values.

I'd rather:
1. keep software and hardware stats separated
2. push to userspace the responsibility to offset device specific hardware
   values jumps

My 0.02 €.

-- 
Ueimor
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