You can search for identifiers within the package.
in-package search v0.2.0
type 'a io = 'a Lwt.t
type buffer = Cstruct.t
type id = int
type macaddr = Macaddr.t
type t
val register : t -> [ `Ok of id | `Error of Mirage_net.error ]
val unregister : t -> id -> unit io
val mac : t -> id -> macaddr
val write : t -> id -> buffer -> (unit, Mirage_net.error) Result.result io
val writev : t -> id -> buffer list -> (unit, Mirage_net.error) Result.result io
val set_listen_fn : t -> id -> (buffer -> unit io) -> unit
val unregister_and_flush : t -> id -> unit io