ice: Do not call ice_finalize_xdp_rx() unnecessarily

Currently ice_finalize_xdp_rx() is called only when xdp_prog is present
on VSI, which is a good thing. However, this optimization can be
enhanced and check only if any of the XDP_TX/XDP_REDIRECT took place in
current Rx processing. Non-zero value of @xdp_xmit indicates that
xdp_prog is present on VSI. This way XDP_DROP-based workloads will not
suffer from unnecessary calls to external function.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Link: https://lore.kernel.org/bpf/20230131204506.219292-9-maciej.fijalkowski@intel.com

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index dd4ed93..b406e8c 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1252,7 +1252,7 @@ construct_skb:
        /* return up to cleaned_count buffers to hardware */
        failure = ice_alloc_rx_bufs(rx_ring, cleaned_count);
 
-       if (xdp_prog)
+       if (xdp_xmit)
                ice_finalize_xdp_rx(xdp_ring, xdp_xmit);
        rx_ring->skb = skb;