https://gerrit.fd.io/r/#/c/7701/ accidentally removed 3 lines of code in dpdk/device/init.c which were added by https://gerrit.fd.io/r/#/c/7826/

case VNET_DPDK_PMD_VHOST_ETHER:
xd->port_type = VNET_DPDK_PORT_TYPE_VHOST_ETHER;
break;

Those lines were needed to recognize vhost-user interface which is created via vdev command in dpdk and display VhostEthernet. Without them, UnknownEthernet is displayed.