tree 4b7cfd343542733b4606298b3e5f8d842bcd1c26
parent 20f8789292afcbbad5d644959a33f339e7efe8e3
author Carmelo Cascone <carmelo@opennetworking.org> 1535614156 -0700
committer Carmelo Cascone <carmelo@opennetworking.org> 1536183730 +0000

Refactor P4Runtime subsystem to implement async connection procedure

This patch is an attempt to solve issues observed when restarting both
switches and ONOS nodes. Most of the issues seemed to depend on a
brittle mastership handling when deploying the pipeline.

With this patch, GDP registers devices to the core with available=false
(i.e. offline) and marks them online only when the P4 pipeline has been
deployed to the device. A new PiPipeconfWatchdogService takes care of
deploying pipelines and producing event when devices are ready.

Moreover, we fix a race condition where pipeconf-related behaviors
were not found. This was caused by GDP enforcing the merged
driver name in the network config, while external entities (e.g.
Mininet) were pushing a JSON blob with the base driver name. This patch
removes the need to rely on such a trick and instead uses
pipeconf-aware logic directly in the driver manager (change #19622).

Finally, we fix issues in P4RuntimeClientImpl that were causing the
stream channel not detecting unreachable devices. The solution is to
follow gRPC APIs and re-instantiate a new channel once the first fails.

Change-Id: I6fbc91859c0fb58a6db3bc197b7081a8fe9f97f7