releases/6.3.6/net-mlx5-e-switch-devcom-sync-devcom-events-and-devc.patch

From 7a52d6618afdf97173eab06a8c0e2616196468e2 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Mon, 6 Feb 2023 11:52:02 +0200
Subject: net/mlx5: E-switch, Devcom, sync devcom events and devcom comp
 register

From: Shay Drory <shayd@nvidia.com>

[ Upstream commit 8c253dfc89efde6b5faddf9e7400e5d17884e042 ]

devcom events are sent to all registered component. Following the
cited patch, it is possible for two components, e.g.: two eswitches,
to send devcom events, while both components are registered. This
means eswitch layer will do double un/pairing, which is double
allocation and free of resources, even though only one un/pairing is
needed. flow example:

	cpu0					cpu1
	----					----

 mlx5_devlink_eswitch_mode_set(dev0)
  esw_offloads_devcom_init()
   mlx5_devcom_register_component(esw0)
                                         mlx5_devlink_eswitch_mode_set(dev1)
                                          esw_offloads_devcom_init()
                                           mlx5_devcom_register_component(esw1)
                                           mlx5_devcom_send_event()
   mlx5_devcom_send_event()

Hence, check whether the eswitches are already un/paired before
free/allocation of resources.

Fixes: 09b278462f16 ("net: devlink: enable parallel ops on netlink interface")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/eswitch.h        | 1 +
 .../net/ethernet/mellanox/mlx5/core/eswitch_offloads.c   | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 31876db3c7641..5fd971cee6fdc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -341,6 +341,7 @@ struct mlx5_eswitch {
 		u32             large_group_num;
 	}  params;
 	struct blocking_notifier_head n_head;
+	bool paired[MLX5_MAX_PORTS];
 };
 
 void esw_offloads_disable(struct mlx5_eswitch *esw);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 727b30f3a229a..a60c9f292e10c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -2744,6 +2744,9 @@ static int mlx5_esw_offloads_devcom_event(int event,
 		    mlx5_eswitch_vport_match_metadata_enabled(peer_esw))
 			break;
 
+		if (esw->paired[mlx5_get_dev_index(peer_esw->dev)])
+			break;
+
 		err = mlx5_esw_offloads_set_ns_peer(esw, peer_esw, true);
 		if (err)
 			goto err_out;
@@ -2755,14 +2758,18 @@ static int mlx5_esw_offloads_devcom_event(int event,
 		if (err)
 			goto err_pair;
 
+		esw->paired[mlx5_get_dev_index(peer_esw->dev)] = true;
+		peer_esw->paired[mlx5_get_dev_index(esw->dev)] = true;
 		mlx5_devcom_set_paired(devcom, MLX5_DEVCOM_ESW_OFFLOADS, true);
 		break;
 
 	case ESW_OFFLOADS_DEVCOM_UNPAIR:
-		if (!mlx5_devcom_is_paired(devcom, MLX5_DEVCOM_ESW_OFFLOADS))
+		if (!esw->paired[mlx5_get_dev_index(peer_esw->dev)])
 			break;
 
 		mlx5_devcom_set_paired(devcom, MLX5_DEVCOM_ESW_OFFLOADS, false);
+		esw->paired[mlx5_get_dev_index(peer_esw->dev)] = false;
+		peer_esw->paired[mlx5_get_dev_index(esw->dev)] = false;
 		mlx5_esw_offloads_unpair(peer_esw);
 		mlx5_esw_offloads_unpair(esw);
 		mlx5_esw_offloads_set_ns_peer(esw, peer_esw, false);
-- 
2.39.2