* VHOST-USER APIs: see .../vnet/devices/virtio/{vhost_user.api, vhost_user_api.c}
* VXLAN GPE APIs: see .../src/vnet/vxlan-gpe/{vxlan_gpe.api, vxlan_gpe_api.c}
* GRE APIs: see .../src/vnet/gre/{gre.api, gre_api.c}
* VHOST-USER APIs: see .../vnet/devices/virtio/{vhost_user.api, vhost_user_api.c}
* VXLAN GPE APIs: see .../src/vnet/vxlan-gpe/{vxlan_gpe.api, vxlan_gpe_api.c}
* GRE APIs: see .../src/vnet/gre/{gre.api, gre_api.c}