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Date: Wed, 13 Apr 2022 17:30:05 +0200 From: Maciej Fijalkowski <maciej.fijalkowski@...el.com> To: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net Cc: netdev@...r.kernel.org, magnus.karlsson@...el.com, alexandr.lobakin@...el.com, maximmi@...dia.com, kuba@...nel.org, bjorn@...nel.org, Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Jesper Dangaard Brouer <brouer@...hat.com> Subject: [PATCH v2 bpf-next 04/14] ixgbe: xsk: decorate IXGBE_XDP_REDIR with likely() ixgbe_run_xdp_zc() suggests to compiler that XDP_REDIRECT is the most probable action returned from BPF program that AF_XDP has in its pipeline. Let's also bring this suggestion up to the callsite of ixgbe_run_xdp_zc() so that compiler will be able to generate more optimized code which in turn will make branch predictor happy. Suggested-by: Jesper Dangaard Brouer <brouer@...hat.com> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com> --- drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 25 ++++++++++---------- 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c index dd7ff66d422f..85497bf10624 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c @@ -303,21 +303,22 @@ int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector, xsk_buff_dma_sync_for_cpu(bi->xdp, rx_ring->xsk_pool); xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, bi->xdp); - if (xdp_res) { - if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) - xdp_xmit |= xdp_res; - else - xsk_buff_free(bi->xdp); + if (likely(xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR))) + xdp_xmit |= xdp_res; + else if (xdp_res == IXGBE_XDP_CONSUMED) + xsk_buff_free(bi->xdp); + else + goto construct_skb; - bi->xdp = NULL; - total_rx_packets++; - total_rx_bytes += size; + bi->xdp = NULL; + total_rx_packets++; + total_rx_bytes += size; - cleaned_count++; - ixgbe_inc_ntc(rx_ring); - continue; - } + cleaned_count++; + ixgbe_inc_ntc(rx_ring); + continue; +construct_skb: /* XDP_PASS path */ skb = ixgbe_construct_skb_zc(rx_ring, bi->xdp); if (!skb) { -- 2.33.1
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