IFLA_INFO_DATA for a macvlan link — the per-kind data inside
IFLA_LINKINFO.
A macvlan carries a single IFLA_MACVLAN_MODE attribute (a u32); the
modes are listed at include/uapi/linux/if_link.h.
Summary
Types
@type t() :: %Linx.Netlink.Rtnl.LinkInfo.Macvlan{mode: term()}