Hi, Please look at an update below from ethdev co-maintainers. 16/04/2020 14:42, Ivan Dyukov: > UNKNOWN speed equals to 0xffffffff [...] > +#define ETH_SPEED_NUM_UNKNOWN 0xffffffff /**< Unknown */ This approach is being rejected in another thread: http://inbox.dpdk.org/dev/42de4bd1-0a6c-6591-cd27-67ce692fabc9@intel.com/