Re: [Linuxptp-users] using ptp4l on vlan interfaces

[Richard C. <ric...@gm...>]

On Wed, Dec 11, 2013 at 03:42:09PM -0600, Shawn Bohrer wrote:
 
> I left the message in but let it continue.  It appears to work fine
> with software timestamps, or at least I don't see any relevant errors
> and it is adjusting the clock.  I haven't looked into the "port 1:
> delay timeout" messages yet.

Those are harmless debug messages that say, "it is time to transmit
another delay request."

> My end goal though is to use hardware timestamps and that currently
> does not work on the vlan interface simply because the SIOCSHWTSTAMP
> ioctl fails.

For now, if you know the real inteface, you can set the ioctl by hand
using the hwstamp_ctl program. Then, just hack ptp4l to skip over the
ioctl, and it might work for you.

>  I'm not sure how it is done, but should ptp4l recognize
> that it is a vlan interface and perform ioctl and ethtool queries
> against the actual device interface?  I know the 'ip' tool associates
> vlan807 with eth4 so that mapping can be detected somehow:

I think it would be nicer if the kernel did this for us automatically,
but I'll have to take this up on the netdev list.

Thanks,
Richard