net/mlx5: E-Switch, Handle UC address change in switchdev mode

When NVME device emulation mode is enabled, more than one PFs use the
same physical port. In this case, MPFS is required to program L2
addresses.

It used to rely on netdev set_rx_mode in switchdev mode, but driver
later changed to not create netdev for eswitch manager once in
switchdev mode. So, UC address event should be handled.
Signed-off-by: Bodong Wang <bodong@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/eswitch.c

@@ -1727,10 +1727,10 @@ int mlx5_esw_query_functions(struct mlx5_core_dev *dev, u32 *out, int outlen)
 
 static void mlx5_eswitch_event_handlers_register(struct mlx5_eswitch *esw)
 {
-	if (esw->mode == MLX5_ESWITCH_LEGACY) {
-		MLX5_NB_INIT(&esw->nb, eswitch_vport_event, NIC_VPORT_CHANGE);
-		mlx5_eq_notifier_register(esw->dev, &esw->nb);
-	} else if (mlx5_eswitch_is_funcs_handler(esw->dev)) {
+	MLX5_NB_INIT(&esw->nb, eswitch_vport_event, NIC_VPORT_CHANGE);
+	mlx5_eq_notifier_register(esw->dev, &esw->nb);
+
+	if (esw->mode == MLX5_ESWITCH_OFFLOADS && mlx5_eswitch_is_funcs_handler(esw->dev)) {
 		MLX5_NB_INIT(&esw->esw_funcs.nb, mlx5_esw_funcs_changed_handler,
 			     ESW_FUNCTIONS_CHANGED);
 		mlx5_eq_notifier_register(esw->dev, &esw->esw_funcs.nb);
@@ -1739,11 +1739,11 @@ static void mlx5_eswitch_event_handlers_register(struct mlx5_eswitch *esw)
 
 static void mlx5_eswitch_event_handlers_unregister(struct mlx5_eswitch *esw)
 {
-	if (esw->mode == MLX5_ESWITCH_LEGACY)
-		mlx5_eq_notifier_unregister(esw->dev, &esw->nb);
-	else if (mlx5_eswitch_is_funcs_handler(esw->dev))
+	if (esw->mode == MLX5_ESWITCH_OFFLOADS && mlx5_eswitch_is_funcs_handler(esw->dev))
 		mlx5_eq_notifier_unregister(esw->dev, &esw->esw_funcs.nb);
 
+	mlx5_eq_notifier_unregister(esw->dev, &esw->nb);
+
 	flush_workqueue(esw->work_queue);
 }
 
@@ -1789,11 +1789,8 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode)
 	if (err)
 		esw_warn(esw->dev, "Failed to create eswitch TSAR");
 
-	/* Don't enable vport events when in MLX5_ESWITCH_OFFLOADS mode, since:
-	 * 1. L2 table (MPFS) is programmed by PF/VF representors netdevs set_rx_mode
-	 * 2. FDB/Eswitch is programmed by user space tools
-	 */
-	enabled_events = (mode == MLX5_ESWITCH_LEGACY) ? SRIOV_VPORT_EVENTS : 0;
+	enabled_events = (mode == MLX5_ESWITCH_LEGACY) ? SRIOV_VPORT_EVENTS :
+		UC_ADDR_CHANGE;
 
 	/* Enable PF vport */
 	vport = mlx5_eswitch_get_vport(esw, MLX5_VPORT_PF);