patch 'net/mlx5: fix port event cleaning order' has been queued to stable release 20.11.7

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/19/22. 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/79c37d65d2ff68ccd8dd2ad99340f54c80232918

Thanks.

Luca Boccassi

---
>From 79c37d65d2ff68ccd8dd2ad99340f54c80232918 Mon Sep 17 00:00:00 2001
From: Michael Baum <michaelba at nvidia.com>
Date: Thu, 10 Nov 2022 00:29:38 +0200
Subject: [PATCH] net/mlx5: fix port event cleaning order

[ upstream commit 13c5c093905c09bb6207ee1c6a4f05d39f8badcd ]

The shared IB device (sh) has per port data with filed for interrupt
handler port_id. It used by shared interrupt handler to find the
corresponding rte_eth device by IB port index.
If value is equal or greater RTE_MAX_ETHPORTS it means there is no
subhandler installed for specified IB port index.

When a few ports are created under same sh, the sh is created with the
first port and the interrupt handler port_id is initialized to
RTE_MAX_ETHPORTS for each port.
In port creation, the interrupt handler port_id is updated with the
correct value. Since this updating, the mlx5_dev_interrupt_nl_cb
function uses this port and its priv structure.
However, when the ports are closed, this filed isn't updated and the
interrupt handler continue working until it is uninstalled in SH
destruction.
If mlx5_dev_interrupt_nl_cb is called between port closing and SH
destruction, it uses invalid port causing a crash.

This patch adds interrupt handler port_id updating to the close function
and add memory barrier to make sure it is done before priv reset.

Fixes: 655c3c26c11e ("net/mlx5: fix initial link status detection")

Signed-off-by: Michael Baum <michaelba at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
---
 drivers/net/mlx5/linux/mlx5_os.c | 3 +++
 drivers/net/mlx5/mlx5.c          | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index af19b54b7e..e79b1a275c 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -1640,6 +1640,9 @@ err_secondary:
 	return eth_dev;
 error:
 	if (priv) {
+		priv->sh->port[priv->dev_port - 1].nl_ih_port_id =
+							       RTE_MAX_ETHPORTS;
+		rte_io_wmb();
 		if (priv->mreg_cp_tbl)
 			mlx5_hlist_destroy(priv->mreg_cp_tbl);
 		if (priv->sh)
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 90985479de..22d3ecace2 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1453,6 +1453,12 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 		if (!c)
 			claim_zero(rte_eth_switch_domain_free(priv->domain_id));
 	}
+	priv->sh->port[priv->dev_port - 1].nl_ih_port_id = RTE_MAX_ETHPORTS;
+	/*
+	 * The interrupt handler port id must be reset before priv is reset
+	 * since 'mlx5_dev_interrupt_nl_cb' uses priv.
+	 */
+	rte_io_wmb();
 	memset(priv, 0, sizeof(*priv));
 	priv->domain_id = RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID;
 	/*
-- 
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2022-11-17 23:07:56.193400526 +0000
+++ 0016-net-mlx5-fix-port-event-cleaning-order.patch	2022-11-17 23:07:55.492330367 +0000
@@ -1 +1 @@
-From 13c5c093905c09bb6207ee1c6a4f05d39f8badcd Mon Sep 17 00:00:00 2001
+From 79c37d65d2ff68ccd8dd2ad99340f54c80232918 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 13c5c093905c09bb6207ee1c6a4f05d39f8badcd ]
+
@@ -28 +29,0 @@
-Cc: stable at dpdk.org
@@ -38 +39 @@
-index 2b6741396d..a71474c90a 100644
+index af19b54b7e..e79b1a275c 100644
@@ -41 +42 @@
-@@ -1676,6 +1676,9 @@ err_secondary:
+@@ -1640,6 +1640,9 @@ err_secondary:
@@ -48,3 +49,3 @@
- #ifdef HAVE_MLX5_HWS_SUPPORT
- 		if (eth_dev &&
- 		    priv->sh &&
+ 		if (priv->mreg_cp_tbl)
+ 			mlx5_hlist_destroy(priv->mreg_cp_tbl);
+ 		if (priv->sh)
@@ -52 +53 @@
-index 1cf6df6049..95b0151fbc 100644
+index 90985479de..22d3ecace2 100644
@@ -55 +56 @@
-@@ -2137,6 +2137,12 @@ mlx5_dev_close(struct rte_eth_dev *dev)
+@@ -1453,6 +1453,12 @@ mlx5_dev_close(struct rte_eth_dev *dev)