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Starting from NVM image revision 5.05, the 710-series device does not process IEEE 1588 (TimeSync) PTP packets in the UDP payload. It only processes PTP packets using the Layer 2 packet format.
Starting in NVM 6.01, this is supported.
So the Firmware of the NIC apparently supports it since the start of 2018.
I have been able to find in the changelog of the i40e driver from end 2016 :
changelog for i40e-1.5.25
* De-feature L3 (UDP) PTP frame detection and timestamping on XL710 devices.
Support for L2 PTP frame detection and timestamping remains.
But I can't find a recent driver changelog that says that the feature is back in the driver.
Is the feature back in the driver or not yet ?