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Issue #722: Document restrictions on types IH and EH in PSA #1027

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Issue #722: Document restrictions on types IH and EH in PSA #1027

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10 changes: 10 additions & 0 deletions p4-16/psa/PSA.mdk
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Expand Up @@ -615,6 +615,16 @@ for all ingress parsers and control blocks. The egress parser and
control blocks can use the same types for those things, or different
types, as the P4 program author wishes.

The types `IH` and `EH` are restricted to be structs. For each member
of these struct types, it must be one of the following types:

+ `header`
+ `header_union`
+ header stack

The intent is that these structs contain all of the headers that can
be parsed, or deparsed.

```
[INCLUDE=psa.p4:Programmable_blocks]
```
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