On Mon, Feb 24, 2025 at 11:29 PM Marcus Wichelmann <[email protected]> wrote: > > When the XDP metadata area was used, it is expected that the same > metadata can also be accessed from TC, as can be read in the description > of the bpf_xdp_adjust_meta helper function. In the tun driver, this was > not yet implemented. > > To make this work, the skb that is being built on XDP_PASS should know > of the current size of the metadata area. This is ensured by adding > calls to skb_metadata_set. For the tun_xdp_one code path, an additional > check is necessary to handle the case where the externally initialized > xdp_buff has no metadata support (xdp->data_meta == xdp->data + 1). > > More information about this feature can be found in the commit message > of commit de8f3a83b0a0 ("bpf: add meta pointer for direct access"). > > Signed-off-by: Marcus Wichelmann <[email protected]>
Acked-by: Jason Wang <[email protected]> Thanks
