[dpdk-stable] patch 'net/i40e: remove compiler barrier from NEON Rx' 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/397f9da5cbd4c093e69d8d6470a10aed20e85c2b

Thanks.

Kevin.

---
>From 397f9da5cbd4c093e69d8d6470a10aed20e85c2b Mon Sep 17 00:00:00 2001
From: Gavin Hu <gavin.hu at arm.com>
Date: Tue, 13 Aug 2019 18:43:31 +0800
Subject: [PATCH] net/i40e: remove compiler barrier from NEON Rx

[ upstream commit f1f0f39806d97a9a4d74d47ce7fb04e9b4943e08 ]

As packet length extraction code was simplified,the ordering
was not necessary any more.[1]

2% performance gain was measured on Marvell ThunderX2.
4.3% performance gain was measured on Ampere eMAG80

[1] http://mails.dpdk.org/archives/dev/2016-April/037529.html

Fixes: ae0eb310f253 ("net/i40e: implement vector PMD for ARM")

Signed-off-by: Gavin Hu <gavin.hu at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Reviewed-by: Steve Capper <steve.capper at arm.com>
---
 drivers/net/i40e/i40e_rxtx_vec_neon.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx_vec_neon.c b/drivers/net/i40e/i40e_rxtx_vec_neon.c
index 5555e9b5c..864eb9a32 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_neon.c
+++ b/drivers/net/i40e/i40e_rxtx_vec_neon.c
@@ -308,7 +308,4 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 		}
 
-		/* avoid compiler reorder optimization */
-		rte_compiler_barrier();
-
 		/* pkt 3,4 shift the pktlen field to be 16-bit aligned*/
 		uint32x4_t len3 = vshlq_u32(vreinterpretq_u32_u64(descs[3]),
-- 
2.21.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2019-11-22 14:36:55.815365859 +0000
+++ 0011-net-i40e-remove-compiler-barrier-from-NEON-Rx.patch	2019-11-22 14:36:55.153150226 +0000
@@ -1 +1 @@
-From f1f0f39806d97a9a4d74d47ce7fb04e9b4943e08 Mon Sep 17 00:00:00 2001
+From 397f9da5cbd4c093e69d8d6470a10aed20e85c2b Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit f1f0f39806d97a9a4d74d47ce7fb04e9b4943e08 ]
+
@@ -15 +16,0 @@
-Cc: stable at dpdk.org