net/mlx5: Lag, Check shared fdb before creating MultiPort E-Switch

Currently, MultiPort E-Switch is requesting to create a LAG with shared
FDB without checking the LAG is supporting shared FDB.
Add the check.

Fixes: a32327a ("net/mlx5: Lag, Control MultiPort E-Switch single FDB mode")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/1741644104-97767-5-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: shayshyi

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

@@ -951,7 +951,7 @@ void mlx5_disable_lag(struct mlx5_lag *ldev)
 				mlx5_eswitch_reload_ib_reps(ldev->pf[i].dev->priv.eswitch);
 }
 
-static bool mlx5_shared_fdb_supported(struct mlx5_lag *ldev)
+bool mlx5_lag_shared_fdb_supported(struct mlx5_lag *ldev)
 {
 	int idx = mlx5_lag_get_dev_index_by_seq(ldev, MLX5_LAG_P1);
 	struct mlx5_core_dev *dev;
@@ -1038,7 +1038,7 @@ static void mlx5_do_bond(struct mlx5_lag *ldev)
 	}
 
 	if (do_bond && !__mlx5_lag_is_active(ldev)) {
-		bool shared_fdb = mlx5_shared_fdb_supported(ldev);
+		bool shared_fdb = mlx5_lag_shared_fdb_supported(ldev);
 
 		roce_lag = mlx5_lag_is_roce_lag(ldev);
 

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

@@ -92,6 +92,7 @@ mlx5_lag_is_ready(struct mlx5_lag *ldev)
 	return test_bit(MLX5_LAG_FLAG_NDEVS_READY, &ldev->state_flags);
 }
 
+bool mlx5_lag_shared_fdb_supported(struct mlx5_lag *ldev);
 bool mlx5_lag_check_prereq(struct mlx5_lag *ldev);
 void mlx5_modify_lag(struct mlx5_lag *ldev,
 		     struct lag_tracker *tracker);

drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c

@@ -83,7 +83,8 @@ static int enable_mpesw(struct mlx5_lag *ldev)
 	if (mlx5_eswitch_mode(dev0) != MLX5_ESWITCH_OFFLOADS ||
 	    !MLX5_CAP_PORT_SELECTION(dev0, port_select_flow_table) ||
 	    !MLX5_CAP_GEN(dev0, create_lag_when_not_master_up) ||
-	    !mlx5_lag_check_prereq(ldev))
+	    !mlx5_lag_check_prereq(ldev) ||
+	    !mlx5_lag_shared_fdb_supported(ldev))
 		return -EOPNOTSUPP;
 
 	err = mlx5_mpesw_metadata_set(ldev);