tb_config_find_router_cap
return (tb_config_find_router_cap(sc, TB_CFG_CAP_VSC, cap, offset));
return (tb_config_find_router_cap(sc, TB_CFG_CAP_VSEC, cap, offset));
int tb_config_find_router_cap(struct router_softc *, u_int, u_int, u_int *);