[RFC PATCH bpf-next 13/14] i40e: prefetch xdp->data before running XDP prog
From: Toshiaki Makita <hidden>
Date: 2019-08-13 12:08:10
Also in:
bpf
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
XDP progs are likely to read/write xdp->data. This improves the performance of xdp_flow. This is included in this series just to demonstrate to what extent xdp_flow performance can increase. Signed-off-by: Toshiaki Makita <redacted> --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index f162252..ea775ae 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c@@ -2207,6 +2207,7 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring, if (!xdp_prog) goto xdp_out; + prefetchw(xdp->data); prefetchw(xdp->data_hard_start); /* xdp_frame write */ act = bpf_prog_run_xdp(xdp_prog, xdp);
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1.8.3.1