From 12d468a62bc19ca08ee9964dcb923f67f87fba7d Mon Sep 17 00:00:00 2001 From: Yongseok Koh Date: Mon, 14 Jan 2019 13:16:22 -0800 Subject: [PATCH] net/mlx5: fix instruction hotspot on replenishing Rx buffer On replenishing Rx buffers for vectorized Rx, mbuf->buf_addr isn't needed to be accessed as it is static and easily calculated from the mbuf address. Accessing the mbuf content causes unnecessary load stall and it is worsened on ARM. Fixes: 545b884b1da3 ("net/mlx5: fix buffer address posting in SSE Rx") Cc: stable@dpdk.org Signed-off-by: Yongseok Koh Acked-by: Shahaf Shuler --- drivers/net/mlx5/mlx5_rxtx_vec.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/mlx5/mlx5_rxtx_vec.h b/drivers/net/mlx5/mlx5_rxtx_vec.h index fda7004e2d..5df8e291e6 100644 --- a/drivers/net/mlx5/mlx5_rxtx_vec.h +++ b/drivers/net/mlx5/mlx5_rxtx_vec.h @@ -102,7 +102,10 @@ mlx5_rx_replenish_bulk_mbuf(struct mlx5_rxq_data *rxq, uint16_t n) return; } for (i = 0; i < n; ++i) { - wq[i].addr = rte_cpu_to_be_64((uintptr_t)elts[i]->buf_addr + + void *buf_addr = rte_mbuf_buf_addr(elts[i], rxq->mp); + + assert(buf_addr == elts[i]->buf_addr); + wq[i].addr = rte_cpu_to_be_64((uintptr_t)buf_addr + RTE_PKTMBUF_HEADROOM); /* If there's only one MR, no need to replace LKey in WQE. */ if (unlikely(mlx5_mr_btree_len(&rxq->mr_ctrl.cache_bh) > 1))