netdev - Re: [RFC PATCH v2] Gemini: Gigabit ethernet driver

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Date:	Wed, 29 Dec 2010 19:30:41 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hans Ulli Kroll <ulli.kroll@...glemail.com>
Cc:	Stephen Hemminger <stephen.hemminger@...tta.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	gemini-board-dev@...ts.berlios.de, netdev@...r.kernel.org,
	Christoph Biedl <linux-kernel.bfrz@...chmal.in-ulm.de>
Subject: Re: [RFC PATCH v2] Gemini: Gigabit ethernet driver

Le mercredi 29 décembre 2010 à 17:56 +0100, Hans Ulli Kroll a écrit :
> 
> On Mon, 27 Dec 2010, Stephen Hemminger wrote:
> 
> > 
> > 
> > ----- Original Message -----
> > > On Mon, 2010-12-27 at 20:21 +0100, Hans Ulli Kroll wrote:
> > > [...]
> > > > BTW:
> > > >
> > > > Why u64_stats ?
> > > > I see only a few driver are using u64_stats.
> > > > vlan, br_device and some intel driver
> > > > no gigabit driver for marvell devices uses u64_stats
> > > 
> > > All new net drivers should implement 64-bit stats. net_device_stats is
> > > kept for backward compatibility because we couldn't change all the
> > > existing drivers at once (it's not a simple change for all of them).
> > > 
> > > Ben.
> > 
> > BS. drivers with old stats are fine. 64 bit only really matters
> > at higher speed. Anyway, it is the kind of thing that can easily
> > be fixed later after driver is merged.
> > 
> > 
> 
> I've readed the Intel driver.
> 
> So we must also implement to old net_stats interface, for backward 
> compatibility ?

If you implement new (64bit) stats, old one is not used at all.

Check net/core/dev.c : dev_get_stats()

If ndo_get_stats64() method is implemented, its called, and legacy
interfaces are ignored.



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