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net/mlx5e: RX, Prefetch the xdp_frame data area 

A loaded XDP program might write to the xdp_frame data area,
prefetchw() it to avoid a potential cache miss.

Performance tests:
ConnectX-5, XDP_TX packet rate, single ring.
CPU: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz

Before: 13,172,976 pps
After:  13,456,248 pps
2% gain.

Fixes: 22f4539881 ("net/mlx5e: Support XDP over Striding RQ")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2018-05-16 10:46:57 +03:00 committed by Saeed Mahameed
parent 58b99ee3e3
commit d3398a4f18
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
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@ -1099,6 +1099,7 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
dma_sync_single_range_for_cpu(rq->pdev, di->addr, head_offset,
frag_size, DMA_FROM_DEVICE);
prefetchw(va); /* xdp_frame data area */
prefetch(data);
rcu_read_lock();