tree 24d67dc002cc9d36202240e914c951140cf8cf66
parent 734b14e07db80d9fdcfe5057eb7930934aa08e54
author Lorenzo Colitti <lorenzo@google.com> 1612537258 +0900
committer Maciej Żenczykowski <maze@google.com> 1612839412 +0000

Add error counters for various failures.

Currently, debugging the tethering programs is not easy because
in case of any failure they simply return TC_ACT_OK. This CL adds
a number of counters that the program can increment in the case
of interesting events such as malformed packets.

At the moment the counters are stored in a global tethering error
map, which is an ARRAY map of 32-bit counters. This should not
take up much space because there are only a dozen of these.

We might not need all of these counters. In future CLs we can
reduce the number of counters, or perhaps move them to a map of
maps so as to have separate counters on a per-interface basis.

Test: manual
Change-Id: I3fcd7eb8d318700092949ff2f39987bf4ba3656c