Hi Richard,

Please find the distro below:

root@ptp-slave:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:        16.04
Codename:       xenial

root@ptp-slave:~# cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.3 LTS"
NAME="Ubuntu"
VERSION="16.04.3 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.3 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/";
SUPPORT_URL="http://help.ubuntu.com/";
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

Kindly let me know if i need to upgrade to specific kenerl version for i40e 
driver support.

Regards,
Karthick

> On Jun 14, 2021, at 12:08 PM, Richard Cochran <richardcoch...@gmail.com> 
> wrote:
> 
> On Mon, Jun 14, 2021 at 11:17:18AM +0530, Karthick Gunasekaran via 
> Linuxptp-users wrote:
>> When trying ptp4l with hardware timestamp on a hw timestamp supported 
>> interface, the sync and delay request packets are being received without 
>> timestamp.
>> 
>> Linux version : 4.4.0-87-generic
> 
> That must be a distro kernel -- which distro?
> 
>> root@ptp-slave:~# ethtool -i enp1s0f0
>> driver: i40e
>> version: 2.15.9
> 
> Hm, did kernel 4.4 already have PTP support in the i40e?
> 
> Maybe this is a buggy back port?
> 
> Thanks,
> Richard
> 



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