net/mlx5: E-Switch, Introduce global tables

Currently, flow tables are automatically connected according to their
<chain,prio,level> tuple.

Introduce global tables which are flow tables that are detached from the
eswitch chains processing, and will be connected by explicitly referencing
them from multiple chains.

Add this new table type, and allow connecting them by refenece.
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -421,6 +421,8 @@ struct mlx5_esw_flow_attr {
 	u16	prio;
 	u32	dest_chain;
 	u32	flags;
+	struct mlx5_flow_table *fdb;
+	struct mlx5_flow_table *dest_ft;
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
 };
 

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

@@ -324,7 +324,12 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 	if (flow_act.action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST) {
 		struct mlx5_flow_table *ft;
 
-		if (attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH) {
+		if (attr->dest_ft) {
+			flow_act.flags |= FLOW_ACT_IGNORE_FLOW_LEVEL;
+			dest[i].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+			dest[i].ft = attr->dest_ft;
+			i++;
+		} else if (attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH) {
 			flow_act.flags |= FLOW_ACT_IGNORE_FLOW_LEVEL;
 			dest[i].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
 			dest[i].ft = mlx5_esw_chains_get_tc_end_ft(esw);
@@ -378,8 +383,11 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 	if (split) {
 		fdb = esw_vport_tbl_get(esw, attr);
 	} else {
-		fdb = mlx5_esw_chains_get_table(esw, attr->chain, attr->prio,
-						0);
+		if (attr->chain || attr->prio)
+			fdb = mlx5_esw_chains_get_table(esw, attr->chain,
+							attr->prio, 0);
+		else
+			fdb = attr->fdb;
 		mlx5_eswitch_set_rule_source_port(esw, spec, attr);
 	}
 	if (IS_ERR(fdb)) {
@@ -402,7 +410,7 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 err_add_rule:
 	if (split)
 		esw_vport_tbl_put(esw, attr);
-	else
+	else if (attr->chain || attr->prio)
 		mlx5_esw_chains_put_table(esw, attr->chain, attr->prio, 0);
 err_esw_get:
 	if (!(attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH) && attr->dest_chain)
@@ -499,7 +507,7 @@ __mlx5_eswitch_del_rule(struct mlx5_eswitch *esw,
 	} else {
 		if (split)
 			esw_vport_tbl_put(esw, attr);
-		else
+		else if (attr->chain || attr->prio)
 			mlx5_esw_chains_put_table(esw, attr->chain, attr->prio,
 						  0);
 		if (attr->dest_chain)

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

@@ -722,6 +722,36 @@ mlx5_esw_chains_get_tc_end_ft(struct mlx5_eswitch *esw)
 	return tc_end_fdb(esw);
 }
 
+struct mlx5_flow_table *
+mlx5_esw_chains_create_global_table(struct mlx5_eswitch *esw)
+{
+	int chain, prio, level, err;
+
+	if (!fdb_ignore_flow_level_supported(esw)) {
+		err = -EOPNOTSUPP;
+
+		esw_warn(esw->dev,
+			 "Couldn't create global flow table, ignore_flow_level not supported.");
+		goto err_ignore;
+	}
+
+	chain = mlx5_esw_chains_get_chain_range(esw),
+	prio = mlx5_esw_chains_get_prio_range(esw);
+	level = mlx5_esw_chains_get_level_range(esw);
+
+	return mlx5_esw_chains_create_fdb_table(esw, chain, prio, level);
+
+err_ignore:
+	return ERR_PTR(err);
+}
+
+void
+mlx5_esw_chains_destroy_global_table(struct mlx5_eswitch *esw,
+				     struct mlx5_flow_table *ft)
+{
+	mlx5_esw_chains_destroy_fdb_table(esw, ft);
+}
+
 static int
 mlx5_esw_chains_init(struct mlx5_eswitch *esw)
 {

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

@@ -25,6 +25,12 @@ mlx5_esw_chains_put_table(struct mlx5_eswitch *esw, u32 chain, u32 prio,
 struct mlx5_flow_table *
 mlx5_esw_chains_get_tc_end_ft(struct mlx5_eswitch *esw);
 
+struct mlx5_flow_table *
+mlx5_esw_chains_create_global_table(struct mlx5_eswitch *esw);
+void
+mlx5_esw_chains_destroy_global_table(struct mlx5_eswitch *esw,
+				     struct mlx5_flow_table *ft);
+
 int mlx5_esw_chains_create(struct mlx5_eswitch *esw);
 void mlx5_esw_chains_destroy(struct mlx5_eswitch *esw);