netdev - RE: [PATCH net-next V3 13/23] ptp: igb: convert to the 64 bit get/set time methods.

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Date:	Thu, 2 Apr 2015 00:08:14 +0000
From:	"Keller, Jacob E" <jacob.e.keller@...el.com>
To:	Richard Cochran <richardcochran@...il.com>
CC:	"thomas.lendacky@....com" <thomas.lendacky@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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Subject: RE: [PATCH net-next V3 13/23] ptp: igb: convert to the 64 bit
 get/set time methods.

> -----Original Message-----
> From: Richard Cochran [mailto:richardcochran@...il.com]
> Sent: Tuesday, March 31, 2015 2:37 PM
> To: Keller, Jacob E
> Cc: thomas.lendacky@....com; linux-kernel@...r.kernel.org;
> baolin.wang@...aro.org; b45643@...escale.com; sshah@...arflare.com;
> amirv@...lanox.com; ben@...adent.org.uk; sonic.zhang@...log.com;
> peppe.cavallaro@...com; Allan, Bruce W; rayagond@...avyalabs.com;
> tglx@...utronix.de; ariel.elior@...gic.com; cmetcalf@...hip.com; Vick,
> Matthew; linux-net-drivers@...arflare.com; arnd@...aro.org;
> Frank.Li@...escale.com; netdev@...r.kernel.org; mchan@...adcom.com;
> Wyborny, Carolyn; prashant@...adcom.com; davem@...emloft.net;
> Kirsher, Jeffrey T; stefan.sorensen@...ctralink.com; john.stultz@...aro.org
> Subject: Re: [PATCH net-next V3 13/23] ptp: igb: convert to the 64 bit
> get/set time methods.
> 
> On Tue, Mar 31, 2015 at 09:08:10PM +0000, Keller, Jacob E wrote:
> > On Sun, 2015-03-29 at 23:12 +0200, Richard Cochran wrote:
> > > For the 82576, the driver's clock is implemented using a timecounter,
> > > and so with this patch that device is ready for the year 2038.
> > >
> > > However, in the case of the i210, the device stores the number of
> > > seconds in a 32 bit register.  Therefore, more work is needed on this
> > > driver before the year 2038 comes around.
> > >
> > > Compile tested only.
> >
> > I assume we would want to use a time counter wrapper here to resolve
> > this issue?
> 
> I would just keep the seconds in software for settime() and adjtime(),
> but let the nanoseconds field go to the hardware.  Then, the gettime()
> result, the periodic outputs, the external time stamps, and the skb
> time stamps will need to be corrected by that many seconds.
> 
> Thanks,
> Richard

That seems reasonable.

Regards,
Jake
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