tree_node_ref
struct tree_node_ref *node_a, *node_b;
node_a = container_of(a, struct tree_node_ref, node);
node_b = container_of(b, struct tree_node_ref, node);
struct tree_node_ref *tnode_r, *tnode_m;
tnode_r = container_of(rb_n, struct tree_node_ref, node);
tnode_r = container_of(rb_n, struct tree_node_ref, node);
private(B) struct bpf_rb_root root_r __contains(tree_node_ref, node);