'Gets the FC target details.'

def get_fc_target_wwpns(self):

    wwpns = []
    port_name_list_api = netapp_api.NaElement('fcp-port-name-list-info')
    result = self.connection.invoke_successfully(port_name_list_api)
    port_names = result.get_child_by_name('fcp-port-names')
    if port_names:
        for port_name_info in port_names.get_children():
            wwpn = port_name_info.get_child_content('port-name').lower()
            wwpns.append(wwpn)
    return wwpns
