MMAC_SLOT_USED
if (!(mmac_info->mac_pool[slot].flags & MMAC_SLOT_USED))
mmac_info->mac_pool[slot].flags |= MMAC_SLOT_USED;
if (mmac_info->mac_pool[slot].flags & MMAC_SLOT_USED) {
mmac_info->mac_pool[slot].flags &= ~MMAC_SLOT_USED;
mmac_info->mac_pool[0].flags |= MMAC_SLOT_USED | MMAC_VENDOR_ADDR;