patch 'net/mlx5: fix hairpin Tx queue reference count' has been queued to stable release 21.11.4

[Kevin Traynor <ktraynor@redhat.com>]

Hi,

FYI, your patch has been queued to stable release 21.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 03/24/23. 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

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/7a7e85c4de66dbbcb0c2db9dee384528ae4057ab

Thanks.

Kevin

---
From 7a7e85c4de66dbbcb0c2db9dee384528ae4057ab Mon Sep 17 00:00:00 2001
From: Bing Zhao <bingz@nvidia.com>
Date: Tue, 7 Mar 2023 12:31:08 +0200
Subject: [PATCH] net/mlx5: fix hairpin Tx queue reference count

[ upstream commit 9284987a85b07e168b165fc258523a3a4fde58e2 ]

When calling the haipin unbind interface, all the hairpin Tx queues
of the port will be unbound from the peer Rx queues. If one of the
Tx queue is working in the auto bind mode, the interface will return
directly.

Only when the Tx and peer Rx ports are the same, the auto bind mode
is supported. In this condition branch, the Tx queue release is
missed and the reference count is not decreased. Then in the port
stop stage, the hardware resources of this Tx queue won't be
freed. There would be some assertion or failure when starting the
port again.

With this commit, the reference count will be operated correctly.

Fixes: 37cd4501e873 ("net/mlx5: support two ports hairpin mode")

Signed-off-by: Bing Zhao <bingz@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_trigger.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index 4800624ea3..feffcc4ce0 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -895,9 +895,9 @@ mlx5_hairpin_unbind_single_port(struct rte_eth_dev *dev, uint16_t rx_port)
 		/* Indeed, only the first used queue needs to be checked. */
 		if (txq_ctrl->hairpin_conf.manual_bind == 0) {
+			mlx5_txq_release(dev, i);
 			if (cur_port != rx_port) {
 				rte_errno = EINVAL;
 				DRV_LOG(ERR, "port %u and port %u are in"
 					" auto-bind mode", cur_port, rx_port);
-				mlx5_txq_release(dev, i);
 				return -rte_errno;
 			} else {
-- 
2.39.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2023-03-22 10:30:08.372249363 +0000
+++ 0018-net-mlx5-fix-hairpin-Tx-queue-reference-count.patch	2023-03-22 10:30:07.932866584 +0000
@@ -1 +1 @@
-From 9284987a85b07e168b165fc258523a3a4fde58e2 Mon Sep 17 00:00:00 2001
+From 7a7e85c4de66dbbcb0c2db9dee384528ae4057ab Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 9284987a85b07e168b165fc258523a3a4fde58e2 ]
+
@@ -21 +22,0 @@
-Cc: stable@dpdk.org
@@ -31 +32 @@
-index 3457bf65d3..bbaa7d2aa0 100644
+index 4800624ea3..feffcc4ce0 100644
@@ -34 +35 @@
-@@ -897,9 +897,9 @@ mlx5_hairpin_unbind_single_port(struct rte_eth_dev *dev, uint16_t rx_port)
+@@ -895,9 +895,9 @@ mlx5_hairpin_unbind_single_port(struct rte_eth_dev *dev, uint16_t rx_port)