59 ena_phc.[ch]        PTP hardware clock infrastructure (see `PHC`_ for more info)
227 .. _`PHC`:  target in RX copybreak
229 PTP Hardware Clock (PHC)
236 **PHC support**
238 PHC depends on the PTP module, which needs to be either loaded as a module or compiled into the ker…
246 - If no output is provided, the ENA driver cannot be loaded with PHC support.
248 **PHC activation**
269 PHC support and capabilities can be verified using ethtool:
275 **PHC timestamp**
277 To retrieve PHC timestamp, use `ptp-userspace-api`_, usage example using `testptp`_:
283 PHC get time requests should be within reasonable bounds,
285 The ENA device restricts the frequency of PHC get time requests to a maximum
289 **PHC statistics**
291 PHC can be monitored using debugfs (if mounted):
300 PHC errors must remain below 1% of all PHC requests to maintain the desired level of accuracy and r…
311 PHC timeouts: