linux-kernel - Re: [PATCH v8 8/8] net: e1000e: Adds hardware supported cross timestamp on e1000e nic

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Message-ID: <1456345364.2808.1.camel@intel.com>
Date:	Wed, 24 Feb 2016 12:22:44 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	"Christopher S. Hall" <christopher.s.hall@...el.com>,
	tglx@...utronix.de, richardcochran@...il.com, mingo@...hat.com,
	john.stultz@...aro.org, hpa@...or.com
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	kevin.b.stanton@...el.com, kevin.j.clarke@...el.com
Subject: Re: [PATCH v8 8/8] net: e1000e: Adds hardware supported cross
 timestamp on e1000e nic

On Mon, 2016-02-22 at 03:15 -0800, Christopher S. Hall wrote:
> Modern Intel systems supports cross timestamping of the network
> device
> clock and Always Running Timer (ART) in hardware.  This allows the
> device time and system time to be precisely correlated. The timestamp
> pair is returned through e1000e_phc_get_syncdevicetime() used by
> get_system_device_crosststamp().  The hardware cross-timestamp result
> is made available to applications through the PTP_SYS_OFFSET_PRECISE
> ioctl which calls e1000e_phc_getcrosststamp().
> 
> Signed-off-by: Christopher S. Hall <christopher.s.hall@...el.com>
> [jstultz: Reworked to use new interface, commit message tweaks]
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  drivers/net/ethernet/intel/Kconfig          |  9 +++
>  drivers/net/ethernet/intel/e1000e/defines.h |  5 ++
>  drivers/net/ethernet/intel/e1000e/ptp.c     | 85
> +++++++++++++++++++++++++++++
>  drivers/net/ethernet/intel/e1000e/regs.h    |  4 ++
>  4 files changed, 103 insertions(+)

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
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