Carmelo Cascone e5b2872eb6 Improve scalability of P4Runtime subsystem
The P4Runtime client was hanging (deadlock) on a master arbitration
request. As such, all other requests (e.g. table write) were waiting
for the client's request lock to become available.

Apart from fixing those deadlocks, this patch brings a number of
improvements that all together allow to run networks of 100+ P4Runtime
devices on a single ONOS instance (before only ~20 devices)

Includes:
- Asynchrounous mastership handling in DevicHandshaker (as defined in
the P4Runtime and OpenFlow spec)
- Refactored arbitration handling in the P4RuntimeClient
to be consistent with the P4Runtime spec
- Report suspect deadlocks in P4RuntimeClientImpl
- Exploit write errors in P4RuntimeClient to quickly report
channel/mastership errors to upper layers
- Complete all futures with deadlines in P4Runtime driver
- Dump all tables in one request
- Re-purposed ChannelEvent to DeviceAgentEvent to carry also mastership
response events
- Fixed IntelliJ warnings
- Various code and log clean-ups

Change-Id: I9376793a9fe69d8eddf7e8ac2ef0ee4c14fbd198
2018-06-29 13:59:27 +00:00
..
2018-05-31 15:44:36 +00:00
2018-04-13 12:47:31 -07:00