patch 'net/mlx5: forbid MPRQ restart' has been queued to stable release 20.11.9

[luca.boccassi@gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/16/23. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/cd1033d5d5b2403684b51a2b926b5fba8ab1dcea

Thanks.

Luca Boccassi

---
From cd1033d5d5b2403684b51a2b926b5fba8ab1dcea Mon Sep 17 00:00:00 2001
From: Alexander Kozyrev <akozyrev@nvidia.com>
Date: Tue, 4 Jul 2023 00:22:24 +0300
Subject: [PATCH] net/mlx5: forbid MPRQ restart

[ upstream commit f0b2d50e2c6c02555b7fbe77f909bd7f1c6ac2e4 ]

The queue restart is only supported by the non-vectorized
single-packet receive queue today. Restarting MPRQ will
result in corrupted packets because of CQE and WQE mismatch.
Prevent this by not allowing the MPRQ Rx queue stop.

Fixes: 161d103b231c ("net/mlx5: add queue start and stop")

Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_rxq.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 5d659738fe..47db585042 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -579,12 +579,12 @@ mlx5_rx_queue_stop(struct rte_eth_dev *dev, uint16_t idx)
 	 * synchronized, that might be broken on RQ restart
 	 * and cause Rx malfunction, so queue stopping is
 	 * not supported if vectorized Rx burst is engaged.
-	 * The routine pointer depends on the process
-	 * type, should perform check there.
+	 * The routine pointer depends on the process type,
+	 * should perform check there. MPRQ is not supported as well.
 	 */
-	if (pkt_burst == mlx5_rx_burst_vec) {
-		DRV_LOG(ERR, "Rx queue stop is not supported "
-			"for vectorized Rx");
+	if (pkt_burst != mlx5_rx_burst) {
+		DRV_LOG(ERR, "Rx queue stop is only supported "
+			"for non-vectorized single-packet Rx");
 		rte_errno = EINVAL;
 		return -EINVAL;
 	}
-- 
2.39.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2023-07-14 23:33:08.871153623 +0100
+++ 0009-net-mlx5-forbid-MPRQ-restart.patch	2023-07-14 23:33:08.491305191 +0100
@@ -1 +1 @@
-From f0b2d50e2c6c02555b7fbe77f909bd7f1c6ac2e4 Mon Sep 17 00:00:00 2001
+From cd1033d5d5b2403684b51a2b926b5fba8ab1dcea Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit f0b2d50e2c6c02555b7fbe77f909bd7f1c6ac2e4 ]
+
@@ -12 +13,0 @@
-Cc: stable@dpdk.org
@@ -21 +22 @@
-index ad8fd13cbe..b314c0482b 100644
+index 5d659738fe..47db585042 100644
@@ -24 +25 @@
-@@ -531,12 +531,12 @@ mlx5_rx_queue_stop(struct rte_eth_dev *dev, uint16_t idx)
+@@ -579,12 +579,12 @@ mlx5_rx_queue_stop(struct rte_eth_dev *dev, uint16_t idx)