ifla_vlan_qos_mapping
struct ifla_vlan_qos_mapping *m;
nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
struct ifla_vlan_qos_mapping m;
[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },