tree 16f119f697fb36cf812f71cc22c46eb723da7064
parent 6085585ef705b62911f04e3e173e9bccc9c171d6
author Carmelo Cascone <carmelo@opennetworking.org> 1575959808 -0800
committer Carmelo Cascone <carmelo@opennetworking.org> 1576538695 +0000

Drop using BNG attachment IDs in favor or dynamically allocated line IDs

The current implementation of BngProgrammable for fabric.p4 uses
attachment IDs as line IDs, thus forcing apps such as bngc to be aware
of such implementation detail and to manage the allocation of such IDs.
Unfortunately, allocation of IDs is dependent on the device (P4 program)
implementation (e.g., line counter size), and so it should not be left
to apps.

This patch removes the need for attachment IDs at all and instead relies
on a driver-level service to dynamically allocate line IDs based on the
attachment attributes (currently s-tag, c-tag, mac address).

The current implementation of the allocation logic is a trivial one,
i.e. non-distributed and non-optimized.

Change-Id: Ie960936ee750cf565b8de41370085ecf9d49e931