Commit 39e12351 authored Mar 25, 2017 by Saeed Mahameed Committed by David S. Miller Mar 24, 2017

net/mlx5e: Poll XDP TX CQ before RX CQ



Handle XDP TX completions before handling RX packets, to make sure more
free space is available for XDP TX packets a moment before handling
RX packets.

Performance improvement:
System: Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz

Test case              Before     Now      improvement
---------------------------------------------------------------
XDP Drop (1 core)      16.9Mpps  16.9Mpps    No change
XDP TX   (1 core)      12Mpps    13Mpps      8%

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 31871f87

drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -118,12 +118,12 @@ int mlx5e_napi_poll(struct napi_struct *napi, int budget)
		for (i = 0; i < c->num_tc; i++)
		busy \|= mlx5e_poll_tx_cq(&c->sq[i].cq, budget);

		work_done = mlx5e_poll_rx_cq(&c->rq.cq, budget);
		busy \|= work_done == budget;

		if (c->xdp)
		busy \|= mlx5e_poll_xdpsq_cq(&c->rq.xdpsq.cq);

		work_done = mlx5e_poll_rx_cq(&c->rq.cq, budget);
		busy \|= work_done == budget;

		mlx5e_poll_ico_cq(&c->icosq.cq);

		busy \|= mlx5e_post_rx_wqes(&c->rq);