8 Jul
2025
8 Jul
'25
2:17 a.m.
On Tue, 8 Jul 2025 02:06:11 +0000 Song, Yoong Siang wrote:
Why would the driver need to move it back? On XDP_PASS an skb is constructed, so the metadata should be transferred to the skb. There is no need to copy it back as a prepend.
I said so because I thought need to put back the timestamp as prepend and then point skb_shared_hwtstamps.netdev_data to it to support the ndo_get_tstamp().
No need, the timestamps are set in shared info directly. There are multiple drivers which use the metadata prepend method, so I'm pretty sure it should work.