Re: [Linuxptp-users] phc2sys with ptp_kvm and mutiport mellanox NICs

[Hussamuddin N. <na...@ne...>]

Yes i can get it working with multiple instances of phc2sys, but was not 
sure that was the best way to move forward. Also does any one have 
experience using the ptp_kvm module (/dev/ptp_kvm) as a source PHC.

I was looking at the latest devel linuxptp code that has a new program 
called "ts2phc" that claims to sync multiple PHCs using a single source 
PHC, but when i try this command i get the error

> ~/linuxptp-code# ts2phc -s /dev/ptp_kvm -c enp7s0 -c enp8s0
> failed to arm slaves

Any suggestions there ?


Also when using phc2sys for this task when only one PHC is used as  
destination like

> /usr/sbin/phc2sys -O 0 -s /dev/ptp_kvm -c enp8s0
Is using the offset set to Zero correct ? the /dev/ptp_kvm gets its time 
from the host clock which is already being synced using a ptp4l (and a 
phc2sys) on the host running with HW Timestamping

-- 
cheers,

Hussam
(Hussamuddin Nasir)

Netlab & GENI Operations Team

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On 7/22/20 1:45 AM, Miroslav Lichvar wrote:
> On Tue, Jul 21, 2020 at 08:43:10PM -0400, nasir via Linuxptp-users wrote:
>> No. I am passing in both ports to the KVM. The KVM sees three ptpt
>> devices. One is using  the ptp_kvm module and the other two are the
>> mellanox NICS. I am trying to sync the mellanox clocks using ptp_kvm
>> as source using phc2sys but using multiple -c options results in
>> phc2sys uaing the last ptp device in the command as its destination
>> device
> I'm not sure how multiple -c options is supposed to work, but I think
> you could run multiple phc2sys instances, one for each clock that
> needs to be synchronized.
>