From: Jesper Dangaard Brouer brouer@redhat.com
[ Upstream commit 4fa8fcd3440101dbacf4fae91de69877ef751977 ]
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 brouer@redhat.com Tested-by: Nechama Kraus nechamax.kraus@linux.intel.com Acked-by: Maciej Fijalkowski maciej.fijalkowski@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/igc/igc_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index d28a80a009537..d83e665b3a4f2 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -2448,8 +2448,10 @@ static struct sk_buff *igc_construct_skb_zc(struct igc_ring *ring,
skb_reserve(skb, xdp->data_meta - xdp->data_hard_start); memcpy(__skb_put(skb, totalsize), xdp->data_meta, totalsize); - if (metasize) + if (metasize) { skb_metadata_set(skb, metasize); + __skb_pull(skb, metasize); + }
return skb; }