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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>, "baolin.wang@...aro.org" <baolin.wang@...aro.org>, "b45643@...escale.com" <b45643@...escale.com>, "sshah@...arflare.com" <sshah@...arflare.com>, "amirv@...lanox.com" <amirv@...lanox.com>, "ben@...adent.org.uk" <ben@...adent.org.uk>, "sonic.zhang@...log.com" <sonic.zhang@...log.com>, "peppe.cavallaro@...com" <peppe.cavallaro@...com>, "Allan, Bruce W" <bruce.w.allan@...el.com>, "rayagond@...avyalabs.com" <rayagond@...avyalabs.com>, "tglx@...utronix.de" <tglx@...utronix.de>, "ariel.elior@...gic.com" <ariel.elior@...gic.com>, "cmetcalf@...hip.com" <cmetcalf@...hip.com>, "Vick, Matthew" <matthew.vick@...el.com>, "linux-net-drivers@...arflare.com" <linux-net-drivers@...arflare.com>, "arnd@...aro.org" <arnd@...aro.org>, "Frank.Li@...escale.com" <Frank.Li@...escale.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "mchan@...adcom.com" <mchan@...adcom.com>, "Wyborny, Carolyn" <carolyn.wyborny@...el.com>, "prashant@...adcom.com" <prashant@...adcom.com>, "davem@...emloft.net" <davem@...emloft.net>, "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>, "stefan.sorensen@...ctralink.com" <stefan.sorensen@...ctralink.com>, "john.stultz@...aro.org" <john.stultz@...aro.org> 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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