These new counters have been added in different kernel versions: - v5.12: local_addr_used, local_addr_max - v5.13: csum_enabled - v6.5: retransmits, bytes_retrans, bytes_sent, bytes_received, bytes_acked It is interesting to display them if they are available. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/415 Acked-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Andrea Claudi <aclaudi@redhat.com> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>