net/mlx5: E-switch: Change eswitch mode only via devlink command

Enable or disable switchdev according to the eswitch mode set by
devlink command. So it is not changed by other functions anymore.
Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -1227,7 +1227,6 @@ static void mlx5_esw_acls_ns_cleanup(struct mlx5_eswitch *esw)
 /**
  * mlx5_eswitch_enable_locked - Enable eswitch
  * @esw:	Pointer to eswitch
- * @mode:	Eswitch mode to enable
  * @num_vfs:	Enable eswitch for given number of VFs. This is optional.
  *		Valid value are 0, > 0 and MLX5_ESWITCH_IGNORE_NUM_VFS.
  *		Caller should pass num_vfs > 0 when enabling eswitch for
@@ -1241,7 +1240,7 @@ static void mlx5_esw_acls_ns_cleanup(struct mlx5_eswitch *esw)
  * mode. If num_vfs >=0 is provided, it setup VF related eswitch vports.
  * It returns 0 on success or error code on failure.
  */
-int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int mode, int num_vfs)
+int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int num_vfs)
 {
 	int err;
 
@@ -1260,9 +1259,7 @@ int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int mode, int num_vfs)
 
 	mlx5_eswitch_update_num_of_vfs(esw, num_vfs);
 
-	esw->mode = mode;
-
-	if (mode == MLX5_ESWITCH_LEGACY) {
+	if (esw->mode == MLX5_ESWITCH_LEGACY) {
 		err = esw_legacy_enable(esw);
 	} else {
 		mlx5_rescan_drivers(esw->dev);
@@ -1277,19 +1274,14 @@ int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int mode, int num_vfs)
 	mlx5_eswitch_event_handlers_register(esw);
 
 	esw_info(esw->dev, "Enable: mode(%s), nvfs(%d), active vports(%d)\n",
-		 mode == MLX5_ESWITCH_LEGACY ? "LEGACY" : "OFFLOADS",
+		 esw->mode == MLX5_ESWITCH_LEGACY ? "LEGACY" : "OFFLOADS",
 		 esw->esw_funcs.num_vfs, esw->enabled_vports);
 
-	mlx5_esw_mode_change_notify(esw, mode);
+	mlx5_esw_mode_change_notify(esw, esw->mode);
 
 	return 0;
 
 abort:
-	esw->mode = MLX5_ESWITCH_LEGACY;
-
-	if (mode == MLX5_ESWITCH_OFFLOADS)
-		mlx5_rescan_drivers(esw->dev);
-
 	mlx5_esw_acls_ns_cleanup(esw);
 	return err;
 }
@@ -1317,7 +1309,7 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
 
 	down_write(&esw->mode_lock);
 	if (!mlx5_esw_is_fdb_created(esw)) {
-		ret = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY, num_vfs);
+		ret = mlx5_eswitch_enable_locked(esw, num_vfs);
 	} else {
 		enum mlx5_eswitch_vport_event vport_events;
 

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

@@ -356,7 +356,7 @@ int mlx5_eswitch_init(struct mlx5_core_dev *dev);
 void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw);
 
 #define MLX5_ESWITCH_IGNORE_NUM_VFS (-1)
-int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int mode, int num_vfs);
+int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int num_vfs);
 int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs);
 void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf);
 void mlx5_eswitch_disable_locked(struct mlx5_eswitch *esw);

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

@@ -2179,17 +2179,18 @@ static int esw_offloads_start(struct mlx5_eswitch *esw,
 {
 	int err, err1;
 
-	err = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_OFFLOADS,
-					 esw->dev->priv.sriov.num_vfs);
+	esw->mode = MLX5_ESWITCH_OFFLOADS;
+	err = mlx5_eswitch_enable_locked(esw, esw->dev->priv.sriov.num_vfs);
 	if (err) {
 		NL_SET_ERR_MSG_MOD(extack,
 				   "Failed setting eswitch to offloads");
-		err1 = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY,
-						  MLX5_ESWITCH_IGNORE_NUM_VFS);
+		esw->mode = MLX5_ESWITCH_LEGACY;
+		err1 = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_IGNORE_NUM_VFS);
 		if (err1) {
 			NL_SET_ERR_MSG_MOD(extack,
 					   "Failed setting eswitch back to legacy");
 		}
+		mlx5_rescan_drivers(esw->dev);
 	}
 	if (esw->offloads.inline_mode == MLX5_INLINE_MODE_NONE) {
 		if (mlx5_eswitch_inline_mode_get(esw,
@@ -3237,12 +3238,12 @@ static int esw_offloads_stop(struct mlx5_eswitch *esw,
 {
 	int err, err1;
 
-	err = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY,
-					 MLX5_ESWITCH_IGNORE_NUM_VFS);
+	esw->mode = MLX5_ESWITCH_LEGACY;
+	err = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_IGNORE_NUM_VFS);
 	if (err) {
 		NL_SET_ERR_MSG_MOD(extack, "Failed setting eswitch to legacy");
-		err1 = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_OFFLOADS,
-						  MLX5_ESWITCH_IGNORE_NUM_VFS);
+		esw->mode = MLX5_ESWITCH_OFFLOADS;
+		err1 = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_IGNORE_NUM_VFS);
 		if (err1) {
 			NL_SET_ERR_MSG_MOD(extack,
 					   "Failed setting eswitch back to offloads");