[RFC net-next 7/9] net/mlx5_core: Go to next flow table support

[Amir Vadai <amir@vadai.me>]

When destination is NULL, continue processing packet in the following
table.
Will be used by the offloads table, to process the traffic before any
other table (without it knowing who is the next table)

Signed-off-by: Amir Vadai <amir@vadai.me>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index 6f68dba..fb3717a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -993,9 +993,27 @@ mlx5_add_flow_rule(struct mlx5_flow_table *ft,
 		   u32 flow_tag,
 		   struct mlx5_flow_destination *dest)
 {
+	struct mlx5_flow_destination *my_dest = NULL;
 	struct mlx5_flow_group *g;
 	struct mlx5_flow_rule *rule;
 
+	if (!dest) {
+		struct mlx5_flow_table *next_ft;
+		struct fs_prio *prio;
+
+		fs_get_obj(prio, ft->node.parent);
+		next_ft = find_next_chained_ft(prio);
+		if (!next_ft) {
+			pr_warn("There is no next flow table\n");
+			return ERR_PTR(-EINVAL);
+		}
+		my_dest = kzalloc(sizeof(*my_dest), GFP_KERNEL);
+		if (!my_dest)
+			return ERR_PTR(-ENOMEM);
+		my_dest->type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+		my_dest->ft = next_ft;
+		dest = my_dest;
+	}
 	nested_lock_ref_node(&ft->node, FS_MUTEX_GRANDPARENT);
 	fs_for_each_fg(g, ft)
 		if (compare_match_criteria(g->mask.match_criteria_enable,
@@ -1012,6 +1030,7 @@ mlx5_add_flow_rule(struct mlx5_flow_table *ft,
 				   match_value, action, flow_tag, dest);
 unlock:
 	unlock_ref_node(&ft->node);
+	kfree(my_dest);
 	return rule;
 }
 EXPORT_SYMBOL(mlx5_add_flow_rule);
-- 
2.7.0