[Linuxptp-users] Using ptp4l on wireless device

[Julian S. <ju...@ju...>]

Hi,

I am trying to migrate from ptp2 to ptp4l currently. Using wired 
networking I got everything to work quite well using software 
timestamping yet and get very good results. But I also need sync via 
wifi (I am aware the results will not be as good as via cable, but 
through ptp2 I was able to achieve at least 100us accuracy).
Now it seems that the wifi stack in recent linux kernels is not 
supporting SOF_TIMESTAMPING_TX_SOFTWARE at all. But this seems to be a 
hard requirement for using ptp4l with software timestamping, right?
I am just wondering how ptp4l was running on a wireless device in this 
discussion:
http://permalink.gmane.org/gmane.comp.linux.ptp.user/295

I'd be glad about any hints how to get ptp4l working with a wireless 
device. Actually I am using a rtl8192cu device right now.
Are there some kernel patches around implementing 
SOF_TIMESTAMPING_TX_SOFTWARE for wireless devices maybe?

-Julian