On Tue, 8 Jul 2025 01:34:13 +0000 Song, Yoong Siang wrote: > >For normal XDP my understanding is that its the driver's responsibility > >to move the "reserved" stuff out of place before presenting the frame to > >program. > > Is it means that driver needs to move out the "reserved" stuff before XDP > program > and then move back the stuff after XDP program for certain situation, like > XDP_PASS?
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.
