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Clarify compile time constant requirements for directionless action p… #1381

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Clarify compile time constant requirements for directionless action p… #1381

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14 changes: 8 additions & 6 deletions p4-16/spec/P4-16-spec.adoc
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Expand Up @@ -6810,12 +6810,14 @@ statements or expressions.

Actions can be executed in two ways:

- Implicitly: by tables during match-action processing.
- Explicitly: either from a `control` block or from another `action`.
In either case, the values for all action parameters
must be supplied explicitly, including values for the directionless
parameters. In this case, the directionless parameters behave like `in`
parameters.
- Implicitly: by tables during match-action processing. For action
invocations specified via table properties (such as `default_action`
or `entries`), directionless parameters must be compile-time constant
values, as these arguments are supplied by the control plane.
- Explicitly: via a call statement, either from a `control` block or from another `action`.
In this case, the values for all action parameters must be supplied explicitly,
including values for directionless parameters. Directionless parameters
behave like `in` parameters and need not be compile-time constant values.

[#sec-tables]
=== Tables
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