This patch adds a series of NetLink flow operation USDT probes.
These probes are in turn used in the upcall_cost Python script,
which in addition of some kernel tracepoints, give an insight into
the time spent on processing upcall.
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Acked-by: Paolo Valerio <pvalerio@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
