[P4-dev] A different type of calculator?

Rakesh Kumar kumar19 at illinois.edu
Fri Oct 20 14:48:20 EDT 2017

Thanks. I was able to use registers to do this.

Are there any limits on the behavioral-model target about how much memory
that one can allocate for registers?


On Wed, Oct 18, 2017 at 4:45 PM, Nate Foster <jnfoster at cs.cornell.edu>

> 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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