[dpdk-stable] patch 'net/mlx5: fix Rx CQ doorbell synchronization on aarch64' has been queued to LTS release 18.11.6

[Kevin Traynor]

Hi,

FYI, your patch has been queued to LTS release 18.11.6

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/29/19. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable-queue/commit/accb06f7dca969ee93204bd1d41f1214a5e604ca

Thanks.

Kevin.

---
>From accb06f7dca969ee93204bd1d41f1214a5e604ca Mon Sep 17 00:00:00 2001
From: Phil Yang <phil.yang at arm.com>
Date: Thu, 5 Sep 2019 18:55:07 +0800
Subject: [PATCH] net/mlx5: fix Rx CQ doorbell synchronization on aarch64

[ upstream commit 94a24aaf6c5bd0a03c2828e7411d30a4fc0ac075 ]

The Rx completion queue doorbell field needs to be updated after
the last CQE decompressed. For the weaker memory model processors,
the compiler barrier is not sufficient to guarantee the order of
these operations, so use the coherent I/O memory barrier to make
sure these fields are updated in order.

Fixes: 570acdb1da8a ("net/mlx5: add vectorized Rx/Tx burst for ARM")

Suggested-by: Gavin Hu <gavin.hu at arm.com>
Signed-off-by: Phil Yang <phil.yang at arm.com>
Reviewed-by: Gavin Hu <gavin.hu at arm.com>
Acked-by: Matan Azrad <matan at mellanox.com>
---
 drivers/net/mlx5/mlx5_rxtx_vec_neon.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
index b1e0e8f3d..cdf9c65f1 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
@@ -1015,5 +1015,5 @@ rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n,
 		}
 	}
-	rte_compiler_barrier();
+	rte_cio_wmb();
 	*rxq->cq_db = rte_cpu_to_be_32(rxq->cq_ci);
 	return rcvd_pkt;
-- 
2.21.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2019-11-22 14:36:57.230925863 +0000
+++ 0038-net-mlx5-fix-Rx-CQ-doorbell-synchronization-on-aarch.patch	2019-11-22 14:36:55.211148987 +0000
@@ -1 +1 @@
-From 94a24aaf6c5bd0a03c2828e7411d30a4fc0ac075 Mon Sep 17 00:00:00 2001
+From accb06f7dca969ee93204bd1d41f1214a5e604ca Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 94a24aaf6c5bd0a03c2828e7411d30a4fc0ac075 ]
+
@@ -13 +14,0 @@
-Cc: stable at dpdk.org
@@ -24 +25 @@
-index 99302869a..e914d017d 100644
+index b1e0e8f3d..cdf9c65f1 100644
@@ -27 +28 @@
-@@ -728,5 +728,5 @@ rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n,
+@@ -1015,5 +1015,5 @@ rxq_burst_v(struct mlx5_rxq_data *rxq, struct rte_mbuf **pkts, uint16_t pkts_n,