[dpdk-stable] patch 'distributor: fix return pkt calls in single mode' has been queued to LTS release 18.11.11

[Kevin Traynor]

Hi,

FYI, your patch has been queued to LTS release 18.11.11

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/20. 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/5cf7042b21b9c2be3a839431ceb3856d4013217c

Thanks.

Kevin.

---
>From 5cf7042b21b9c2be3a839431ceb3856d4013217c Mon Sep 17 00:00:00 2001
From: Lukasz Wojciechowski <l.wojciechow at partner.samsung.com>
Date: Sat, 17 Oct 2020 05:06:50 +0200
Subject: [PATCH] distributor: fix return pkt calls in single mode

[ upstream commit f25fe0d5e3e0dd1650845eca928f2263898f5a19 ]

In the single legacy version of the distributor synchronization
requires continues exchange of buffers between distributor
and workers. Empty buffers are sent if only handshake
synchronization is required.
However calls to the rte_distributor_return_pkt()
with 0 buffers in single mode were ignored and not passed to the
legacy algorithm implementation causing lack of synchronization.

This patch fixes this issue by passing NULL as buffer which is
a valid way of sending just synchronization handshakes
in single mode.

Fixes: 775003ad2f96 ("distributor: add new burst-capable library")

Signed-off-by: Lukasz Wojciechowski <l.wojciechow at partner.samsung.com>
Acked-by: David Hunt <david.hunt at intel.com>
---
 lib/librte_distributor/rte_distributor.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_distributor/rte_distributor.c b/lib/librte_distributor/rte_distributor.c
index 2673aa2649..873ca290dd 100644
--- a/lib/librte_distributor/rte_distributor.c
+++ b/lib/librte_distributor/rte_distributor.c
@@ -182,4 +182,7 @@ rte_distributor_return_pkt_v1705(struct rte_distributor *d,
 			return rte_distributor_return_pkt_v20(d->d_v20,
 				worker_id, oldpkt[0]);
+		else if (num == 0)
+			return rte_distributor_return_pkt_v20(d->d_v20,
+				worker_id, NULL);
 		else
 			return -EINVAL;
-- 
2.26.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2020-11-18 16:33:38.405291720 +0000
+++ 0023-distributor-fix-return-pkt-calls-in-single-mode.patch	2020-11-18 16:33:37.928215061 +0000
@@ -1 +1 @@
-From f25fe0d5e3e0dd1650845eca928f2263898f5a19 Mon Sep 17 00:00:00 2001
+From 5cf7042b21b9c2be3a839431ceb3856d4013217c Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit f25fe0d5e3e0dd1650845eca928f2263898f5a19 ]
+
@@ -19 +20,0 @@
-Cc: stable at dpdk.org
@@ -28 +29 @@
-index 7aa079d53c..6e3eae58f8 100644
+index 2673aa2649..873ca290dd 100644
@@ -31,2 +32,2 @@
-@@ -168,4 +168,7 @@ rte_distributor_return_pkt(struct rte_distributor *d,
- 			return rte_distributor_return_pkt_single(d->d_single,
+@@ -182,4 +182,7 @@ rte_distributor_return_pkt_v1705(struct rte_distributor *d,
+ 			return rte_distributor_return_pkt_v20(d->d_v20,
@@ -35 +36 @@
-+			return rte_distributor_return_pkt_single(d->d_single,
++			return rte_distributor_return_pkt_v20(d->d_v20,