net/mlx5: E-Switch, Hold mutex when querying drop counter in legacy mode

Consider scenario below, CPU 1 is at risk to query already destroyed
drop counters. Need to apply the same state mutex when disabling vport.

+-------------------------------+-------------------------------------+
| CPU 0                         | CPU 1                               |
+-------------------------------+-------------------------------------+
| mlx5_device_disable_sriov     | mlx5e_get_vf_stats                  |
| mlx5_eswitch_disable          | mlx5_eswitch_get_vport_stats        |
| esw_disable_vport             | mlx5_eswitch_query_vport_drop_stats |
| mlx5_fc_destroy(drop_counter) | mlx5_fc_query(drop_counter)         |
+-------------------------------+-------------------------------------+

Fixes: b8a0dbe3a90b ("net/mlx5e: E-switch, Add steering drop counters")
Signed-off-by: Bodong Wang <bodong@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index b123089..b4b93d2 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -2620,9 +2620,13 @@ static int mlx5_eswitch_query_vport_drop_stats(struct mlx5_core_dev *dev,
        u64 bytes = 0;
        int err = 0;
 
-       if (!vport->enabled || esw->mode != MLX5_ESWITCH_LEGACY)
+       if (esw->mode != MLX5_ESWITCH_LEGACY)
                return 0;
 
+       mutex_lock(&esw->state_lock);
+       if (!vport->enabled)
+               goto unlock;
+
        if (vport->egress.legacy.drop_counter)
                mlx5_fc_query(dev, vport->egress.legacy.drop_counter,
                              &stats->rx_dropped, &bytes);
@@ -2633,20 +2637,22 @@ static int mlx5_eswitch_query_vport_drop_stats(struct mlx5_core_dev *dev,
 
        if (!MLX5_CAP_GEN(dev, receive_discard_vport_down) &&
            !MLX5_CAP_GEN(dev, transmit_discard_vport_down))
-               return 0;
+               goto unlock;
 
        err = mlx5_query_vport_down_stats(dev, vport->vport, 1,
                                          &rx_discard_vport_down,
                                          &tx_discard_vport_down);
        if (err)
-               return err;
+               goto unlock;
 
        if (MLX5_CAP_GEN(dev, receive_discard_vport_down))
                stats->rx_dropped += rx_discard_vport_down;
        if (MLX5_CAP_GEN(dev, transmit_discard_vport_down))
                stats->tx_dropped += tx_discard_vport_down;
 
-       return 0;
+unlock:
+       mutex_unlock(&esw->state_lock);
+       return err;
 }
 
 int mlx5_eswitch_get_vport_stats(struct mlx5_eswitch *esw,