'Get mac address for given Virtual Function address
@param pci_slot: pci slot
@return: MAC address of virtual function'

def get_pci_device(self, pci_slot):

    vf_index = self.pci_slot_map.get(pci_slot)
    mac = None
    if (vf_index is not None):
        ls = pci_lib.PciDeviceIPWrapper.link_show()
        if PciOsWrapper.is_assigned_vf(self.dev_name, vf_index, ls):
            macs = self.pci_dev_wrapper.get_assigned_macs([vf_index])
            mac = macs.get(vf_index)
    return mac
