Tune clock frequency

Check that frequency can be tuned for PTP device associated with the tested network interface.

Scenarios: X3-PTP004, X3-PTP005.

1. Find out PTP device associated with the IUT interface, call open() to get its FD.

2. Call clock_adjtime() to check whether current frequency offset is zero.

3. Use clock_adjtime() to tune PTP device frequency according to freq. With help of clock_gettime() check whether the clock works as expected after that.

4. Use clock_adjtime() to undo the previously made change. With help of clock_gettime() check whether the clock works as expected after that.

Yurij Plotnikov Yurij.Plotnikov@arknetworks.am

Parameters:

env	Testing environment: env.peer2peer
freq	Frequency offset, in parts per million
min_sleep	Minimum time to sleep between clock_gettime() calls when checking how the clock advances, seconds
max_sleep	Maximum time to sleep between clock_gettime() calls when checking how the clock advances, seconds