Virtual ports on multiple incoming connections

[mathisrichter]

Draft implementation to support virtual ports on multiple incoming connections of a port (wip).
This currently only supports this use case between PyOutPorts and PyInPorts (with virtual ports). RefPorts/VarPorts would have to be handled similarly.

I am looking for feedback on the way I am associating the CSP ports in the PyInPort with the transformation functions that must be applied. In the Compiler, I am associating the transformation functions with a string-based ID of the source port. In the Runtime, I am associating the CSP port with the same ID. The Builder is the only place where these two pieces of information coexist. There, I am then creating an association between the CSP port and the transformation function (through the common ID).

Signed-off-by: Mathis Richter mathis.richter@intel.com

Issue Number: #223

Objective of pull request: Support for virtual ports on multiple incoming connections to a Port.

Pull request checklist

Your PR fulfills the following requirements:

• Issue created that explains the change and why it's needed
• Tests are part of the PR (for bug fixes / features)
• Docs reviewed and added / updated if needed (for bug fixes / features)
• PR conforms to Coding Conventions
• PR applys BSD 3-clause or LGPL2.1+ Licenses to all code files
• Lint (flakeheaven lint src/lava tests/) and (bandit -r src/lava/.) pass locally
• Build tests (pytest) passes locally

Pull request type

Please check your PR type:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation changes
• Other (please describe):

What is the current behavior?

• Virtual ports on multiple incoming connections to a Port are not supported.

What is the new behavior?

• Virtual ports on multiple incoming connections to a Port are now supported.

Does this introduce a breaking change?

• Yes
• No

Supplemental information

[PhilippPlank]

Looks good for me, I would just recommend to change the identifier of the csp_port dictionary.

[joyeshmishra]

Minor changes recommended.