net/mlx5e: Support offloaded TC flows with no matches on headers

For example:
    tc filter add dev ens2f0_0 parent ffff: flower skip_sw action drop

Note that for eswitch flows, we still always match on the source port.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -58,6 +58,7 @@ struct mlx5_nic_flow_attr {
 	u32 flow_tag;
 	u32 mod_hdr_id;
 	u32 hairpin_tirn;
+	u8 match_level;
 	struct mlx5_flow_table	*hairpin_ft;
 };
 
@@ -753,7 +754,9 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv,
 		table_created = true;
 	}
 
-	parse_attr->spec.match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
+	if (attr->match_level != MLX5_MATCH_NONE)
+		parse_attr->spec.match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
+
 	rule = mlx5_add_flow_rules(priv->fs.tc.t, &parse_attr->spec,
 				   &flow_act, dest, dest_ix);
 
@@ -1547,6 +1550,11 @@ static int parse_cls_flower(struct mlx5e_priv *priv,
 		}
 	}
 
+	if (flow->flags & MLX5E_TC_FLOW_ESWITCH)
+		flow->esw_attr->match_level = match_level;
+	else
+		flow->nic_attr->match_level = match_level;
+
 	return err;
 }
 

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

@@ -245,6 +245,7 @@ struct mlx5_esw_flow_attr {
 	bool	vlan_handled;
 	u32	encap_id;
 	u32	mod_hdr_id;
+	u8	match_level;
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
 };
 

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

@@ -91,8 +91,12 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 	misc = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, misc_parameters);
 	MLX5_SET_TO_ONES(fte_match_set_misc, misc, source_port);
 
-	spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS |
-				      MLX5_MATCH_MISC_PARAMETERS;
+	if (attr->match_level == MLX5_MATCH_NONE)
+		spec->match_criteria_enable = MLX5_MATCH_MISC_PARAMETERS;
+	else
+		spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS |
+					      MLX5_MATCH_MISC_PARAMETERS;
+
 	if (flow_act.action & MLX5_FLOW_CONTEXT_ACTION_DECAP)
 		spec->match_criteria_enable |= MLX5_MATCH_INNER_HEADERS;