How to correlate between HW timestamps and system time

[danfruehauf]

I'm trying to use hardware timestamping + libvma extended socket API (register_recv_callback).

When enabling SOL_SOCKET/SO_TIMESTAMPING/SOF_TIMESTAMPING_RAW_HARDWARE, the only way to get vma_info_t->hw_timestamp is to use it with conjunction with VMA_HW_TS_CONVERSION=1. Otherwise libvma returns ENODEV. I found this looking at the code.

My question now is how can I correlate the HW timestamp generated this way with system time? I could not find any documentation on that. And from my understanding SW timestamp is when the packet arrived to libvma/userland. My intention is to understand how long user land is "snoozing" while there is a packet on the wire.

[Bresenham]

Did you find a solution for this problem?

[danfruehauf]

Did you find a solution for this problem?

@Bresenham Haven't looked at that for a while, but at the time, no, I did not find a solution.