tb_switch_find_by_route
sw = tb_switch_find_by_route(tb, route);
parent_sw = tb_switch_find_by_route(tb, get_parent_route(route));
sw = tb_switch_find_by_route(tb, route);
sw = tb_switch_find_by_route(tb, route);
sw = tb_switch_find_by_route(tb, get_parent_route(route));
sw = tb_switch_find_by_route(tb, route);
sw = tb_switch_find_by_route(tb, ev->route);
sw = tb_switch_find_by_route(tb, ev->route);
struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route);