vsw_add_mcst
if (vsw_add_mcst(vswp, VSW_LOCALDEV, addr, NULL) == 0) {
extern int vsw_add_mcst(vsw_t *, uint8_t, uint64_t, void *);
extern int vsw_add_mcst(vsw_t *vswp, uint8_t devtype, uint64_t addr, void *arg);
int vsw_add_mcst(vsw_t *, uint8_t, uint64_t, void *);
if (vsw_add_mcst(vswp, VSW_VNETPORT, addr, port) == 0) {