On 11/15/2021 22:36, Jesper Dangaard Brouer wrote:

Driver already implicitly supports XDP metadata access in AF_XDP
zero-copy mode, as xsk_buff_pool's xp_alloc() naturally set xdp_buff
data_meta equal data.

This works fine for XDP and AF_XDP, but if a BPF-prog adjust via
bpf_xdp_adjust_meta() and choose to call XDP_PASS, then igc function
igc_construct_skb_zc() will construct an invalid SKB packet. The
function correctly include the xdp->data_meta area in the memcpy, but
forgot to pull header to take metasize into account.

Fixes: fc9df2a0b520 ("igc: Enable RX via AF_XDP zero-copy")
Signed-off-by: Jesper Dangaard Brouer <redacted>
---
  drivers/net/ethernet/intel/igc/igc_main.c |    4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

Tested-by: Nechama Kraus <redacted>