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From: Yongseok Koh <yskoh@mellanox.com>
To: olivier.matz@6wind.com, shahafs@mellanox.com
Cc: dev@dpdk.org, roszenrami@gmail.com, david.marchand@redhat.com,
	stable@dpdk.org
Subject: [dpdk-dev] [PATCH v4 2/2] net/mlx5: fix instruction hotspot on replenishing Rx buffer
Date: Thu, 10 Jan 2019 14:40:30 -0800	[thread overview]
Message-ID: <20190110224030.2671-2-yskoh@mellanox.com> (raw)
In-Reply-To: <20190110224030.2671-1-yskoh@mellanox.com>

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 <yskoh@mellanox.com>
---

v4:
* no change

v3:
* rte_mbuf_buf_addr_default() -> rte_mbuf_buf_addr()

v2:
* use the newly introduced API - rte_mbuf_buf_addr_default()
* fix error in assert

 drivers/net/mlx5/mlx5_rxtx_vec.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx_vec.h b/drivers/net/mlx5/mlx5_rxtx_vec.h
index fda7004e2d..989a1fdce5 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec.h
@@ -102,8 +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 +
-					      RTE_PKTMBUF_HEADROOM);
+		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))
 			wq[i].lkey = mlx5_rx_mb2mr(rxq, elts[i]);
-- 
2.11.0

  reply	other threads:[~2019-01-10 22:40 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-09  8:54 [dpdk-dev] [PATCH] " Yongseok Koh
2019-01-09  9:38 ` David Marchand
2019-01-09  9:52   ` Olivier Matz
2019-01-09  9:56     ` Yongseok Koh
2019-01-09 10:05       ` David Marchand
2019-01-09 10:11         ` Yongseok Koh
2019-01-09 13:19 ` [dpdk-dev] [PATCH v2 1/2] mbuf: add function returning default buffer address Yongseok Koh
2019-01-09 13:19   ` [dpdk-dev] [PATCH v2 2/2] net/mlx5: fix instruction hotspot on replenishing Rx buffer Yongseok Koh
2019-01-09 13:46   ` [dpdk-dev] [PATCH v2 1/2] mbuf: add function returning default buffer address David Marchand
2019-01-10  1:39     ` Rami Rosen
2019-01-10 18:18       ` Yongseok Koh
2019-01-10 18:22     ` Yongseok Koh
2019-01-10 18:35 ` [dpdk-dev] [PATCH v3 " Yongseok Koh
2019-01-10 18:35   ` [dpdk-dev] [PATCH v3 2/2] net/mlx5: fix instruction hotspot on replenishing Rx buffer Yongseok Koh
2019-01-10 19:10     ` Shahaf Shuler
2019-01-11  8:14   ` [dpdk-dev] [PATCH v3 1/2] mbuf: add function returning default buffer address Andrew Rybchenko
2019-01-11 11:03     ` Yongseok Koh
2019-01-11 11:17       ` Andrew Rybchenko
2019-01-11 11:37         ` Yongseok Koh
2019-01-11 11:57         ` Bruce Richardson
2019-01-11 12:48           ` David Marchand
2019-01-14 15:51             ` Olivier Matz
2019-01-10 22:40 ` [dpdk-dev] [PATCH v4 " Yongseok Koh
2019-01-10 22:40   ` Yongseok Koh [this message]
2019-01-11  8:05   ` Olivier Matz
2019-01-11  8:11   ` David Marchand
2019-01-11  8:32     ` David Marchand
2019-01-11 11:09       ` Yongseok Koh
2019-01-11 10:25     ` Thomas Monjalon
2019-01-14 21:16 ` [dpdk-dev] [PATCH v5 1/2] mbuf: add function returning " Yongseok Koh
2019-01-14 21:16   ` [dpdk-dev] [PATCH v5 2/2] net/mlx5: fix instruction hotspot on replenishing Rx buffer Yongseok Koh
2019-02-06 15:54     ` Kevin Traynor
2019-02-21 19:10       ` Kevin Traynor
2019-03-08  2:05         ` Yongseok Koh
2019-01-15  1:35   ` [dpdk-dev] [PATCH v5 1/2] mbuf: add function returning buffer address Thomas Monjalon

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