It might be necessary to ‘seed’ the adapter clock time - otherwise timestamps might be zeroed or reported as 01 Jan 1970. This can be done by briefly running Solarflare PTP (sfptpd) as a slave - the adapter clock is seeded from the system clock.
Running sfptpd in freerun mode will achieve the same result. It is not required to actually receive any PTP packets to seed the adapter clock and sfptpd can be terminated after a few seconds as it is only required to ‘seed’ the adapter clock.
Users who wish to synchronize the adapter clock with an external time source should refer to the Enhanced PTP User Guide (UG1602).