On 5/1/20 9:41 AM, Jesper Dangaard Brouer wrote: > One use-case for tail grow patchset, is to add a kernel timestamp at > XDP time in the extended tailroom of packet and return XDP_PASS to let > packet travel were it needs to go, and then via tcpdump we can extract > this timestamp. (E.g. this could improve on Ilias TSN measurements[2]). That's an interesting trick for timestamping xdp frames. Have you looked at having xdp frames use existing timestamping APIs? e.g., if PTP is enabled, pull the timestamp as meta data for the frame.
