net/mlx5: E-Switch, Allow goto earlier chain if FW supports it

Mellanox FW can support this if ignore_flow_level capability exists.
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -3533,7 +3533,8 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 				NL_SET_ERR_MSG_MOD(extack, "Goto action is not supported");
 				return -EOPNOTSUPP;
 			}
-			if (dest_chain <= attr->chain) {
+			if (!mlx5_esw_chains_backwards_supported(esw) &&
+			    dest_chain <= attr->chain) {
 				NL_SET_ERR_MSG(extack, "Goto earlier chain isn't supported");
 				return -EOPNOTSUPP;
 			}

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

@@ -97,6 +97,11 @@ bool mlx5_esw_chains_prios_supported(struct mlx5_eswitch *esw)
 	return esw->fdb_table.flags & ESW_FDB_CHAINS_AND_PRIOS_SUPPORTED;
 }
 
+bool mlx5_esw_chains_backwards_supported(struct mlx5_eswitch *esw)
+{
+	return fdb_ignore_flow_level_supported(esw);
+}
+
 u32 mlx5_esw_chains_get_chain_range(struct mlx5_eswitch *esw)
 {
 	if (!mlx5_esw_chains_prios_supported(esw))

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

@@ -6,6 +6,8 @@
 
 bool
 mlx5_esw_chains_prios_supported(struct mlx5_eswitch *esw);
+bool
+mlx5_esw_chains_backwards_supported(struct mlx5_eswitch *esw);
 u32
 mlx5_esw_chains_get_prio_range(struct mlx5_eswitch *esw);
 u32