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>

4 files changed, 51 insertions, 5 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index ee36a8ab8e65..dae0f3e5ada9 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/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;
 };
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 5e751d7749db..0c4bf69f6c47 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/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)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c
index ca3bbf84a5be..84e3313e3bf1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c
+++ b/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)
 {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.h
index e806d8de868e..c7bc609acb91 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.h
+++ b/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);