func (mapper *NetLinkMapper) Enhance(mac string, attrs *flow.Flow_InterfaceAttributes) { a, f := mapper.cache.Get(strconv.Itoa(int(attrs.GetIfIndex()))) if f { la := a.(*netlink.LinkAttrs) attrs.IfName = proto.String(la.Name) attrs.MTU = proto.Uint32(uint32(la.MTU)) return } mapper.cacheUpdaterChan <- attrs.GetIfIndex() }