[P4-dev] A different type of calculator?

Nate Foster jnfoster at cs.cornell.edu
Wed Oct 18 17:45:46 EDT 2017


If you want to persist state across packets (in P4_14, or with current
P4_16 architectures like v1model.p4) you'll need to use a register.

-N

On Wed, Oct 18, 2017 at 5:41 PM, Rakesh Kumar <kumar19 at illinois.edu> wrote:

> Hey All,
>
> I know, it would sound inefficient, but that is not the point. The point
> is to be able to perform computation on data that exists beyond the packet
> headers of the single packet. Is that possible:
>
> Three packets are sent to a switch, one after the other, two of them
> contain an operand each and the third one contains the operator in the
> header. Can a P4 program be written which *holds on* to the previous two
> packets in some memory and computes the result based on the operator packet
> and return it back to the sender with a result field populated.
>
>
>
> -
> rakesh
>
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>
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