linux-kernel - RE: [PATCH] igb: adjust ptp timestamps for tx/rx latency

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Date:	Tue, 10 May 2016 01:31:49 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	Nathan Sullivan <nathan.sullivan@...com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Nelson, Shannon" <shannon.nelson@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"Williams, Mitch A" <mitch.a.williams@...el.com>
CC:	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] igb: adjust ptp timestamps for tx/rx latency

> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Nathan Sullivan
> Sent: Tuesday, May 3, 2016 4:11 PM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>; Brandeburg, Jesse
> <jesse.brandeburg@...el.com>; Nelson, Shannon
> <shannon.nelson@...el.com>; Wyborny, Carolyn
> <carolyn.wyborny@...el.com>; Skidmore, Donald C
> <donald.c.skidmore@...el.com>; Allan, Bruce W <bruce.w.allan@...el.com>;
> Ronciak, John <john.ronciak@...el.com>; Williams, Mitch A
> <mitch.a.williams@...el.com>
> Cc: intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Nathan Sullivan <nathan.sullivan@...com>
> Subject: [PATCH] igb: adjust ptp timestamps for tx/rx latency
> 
> Table 7-62 on page 338 of the i210 datasheet lists TX and RX latencies
> for the various speeds the chip supports.  To give better ptp timestamp
> accuracy, adjust the timestamps by the amounts Intel gives based on
> current link speed.
> 
> Signed-off-by: Nathan Sullivan <nathan.sullivan@...com>
> ---
>  drivers/net/ethernet/intel/igb/igb.h     |    8 +++++++
>  drivers/net/ethernet/intel/igb/igb_ptp.c |   36
> ++++++++++++++++++++++++++++++
>  2 files changed, 44 insertions(+)

Tested-by: Aaron Brown <aaron.f.brown@...el.com>