[dpdk-stable] patch 'net/mlx5: remove redundant operations in NEON Rx' has been queued to stable release 20.11.3

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/28/21. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/2a5c46697b2b0aa0ff37f18b92ba6aa90d9dcb69

Thanks.

Luca Boccassi

---
>From 2a5c46697b2b0aa0ff37f18b92ba6aa90d9dcb69 Mon Sep 17 00:00:00 2001
From: Ruifeng Wang <ruifeng.wang at arm.com>
Date: Wed, 7 Jul 2021 17:03:06 +0800
Subject: [PATCH] net/mlx5: remove redundant operations in NEON Rx

[ upstream commit ff6fcd415f4b2be7572abffa5284978c176d3de4 ]

Mask of entries after the compressed CQE is covered by invalid mask of
non-compressed valid CQEs. Hence remove redundant calculation on mask.
The change showed slight performance uplift on N1SDP.

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

Signed-off-by: Ruifeng Wang <ruifeng.wang at arm.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
---
 drivers/net/mlx5/mlx5_rxtx_vec_neon.h | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
index 2234fbe6b2..ce50a3ccc4 100644
--- a/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
+++ b/drivers/net/mlx5/mlx5_rxtx_vec_neon.h
@@ -767,16 +767,15 @@ rxq_cq_process_v(struct mlx5_rxq_data *rxq, volatile struct mlx5_cqe *cq,
 		comp_idx = __builtin_clzl(vget_lane_u64(vreinterpret_u64_u16(
 					  comp_mask), 0)) /
 					  (sizeof(uint16_t) * 8);
-		/* D.6 mask out entries after the compressed CQE. */
-		mask = vcreate_u16(comp_idx < MLX5_VPMD_DESCS_PER_LOOP ?
-				   -1UL >> (comp_idx * sizeof(uint16_t) * 8) :
-				   0);
-		invalid_mask = vorr_u16(invalid_mask, mask);
+		invalid_mask = vorr_u16(invalid_mask, comp_mask);
 		/* D.7 count non-compressed valid CQEs. */
 		n = __builtin_clzl(vget_lane_u64(vreinterpret_u64_u16(
 				   invalid_mask), 0)) / (sizeof(uint16_t) * 8);
 		nocmp_n += n;
-		/* D.2 get the final invalid mask. */
+		/*
+		 * D.2 mask out entries after the compressed CQE.
+		 *     get the final invalid mask.
+		 */
 		mask = vcreate_u16(n < MLX5_VPMD_DESCS_PER_LOOP ?
 				   -1UL >> (n * sizeof(uint16_t) * 8) : 0);
 		invalid_mask = vorr_u16(invalid_mask, mask);
-- 
2.30.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-07-26 13:53:16.214236629 +0100
+++ 0005-net-mlx5-remove-redundant-operations-in-NEON-Rx.patch	2021-07-26 13:53:15.777291109 +0100
@@ -1 +1 @@
-From ff6fcd415f4b2be7572abffa5284978c176d3de4 Mon Sep 17 00:00:00 2001
+From 2a5c46697b2b0aa0ff37f18b92ba6aa90d9dcb69 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit ff6fcd415f4b2be7572abffa5284978c176d3de4 ]
+
@@ -11 +12,0 @@
-Cc: stable at dpdk.org
@@ -20 +21 @@
-index 5c569ee199..4d1710b837 100644
+index 2234fbe6b2..ce50a3ccc4 100644