[P4-dev] Default switch case should not be reachable with new extern function primitive

Antonin Bas antonin at barefootnetworks.com
Mon Feb 4 15:36:55 EST 2019

The parameters of your C++ action primitive implementation should be Data
&, const Data &, const Data &
My guess is that you forgot the const qualifiers.

On Sat, Feb 2, 2019 at 5:34 PM Hamidreza Almasi <halmas3 at uic.edu> wrote:

> I have defined an extern function as follows:
> extern void int_div(out bit<32> result, in bit<32> op1, in bit<32> op2);
> and have implemented its functionality as a simple_switch primitive from
> p4 tutorials suggested checkouts tags. I compile the p4 code with:
> p4c-bm2-ss --p4v 16 --p4runtime-file basic.p4info --p4runtime-format text
> -o basic.json basic.p4
> and feed it to simple_switch_grpc but when I send a packet, the switch
> fails noting:
> Assertion 'Default switch case should not be reachable' failed, file
> '../../include/bm/bm_sim/actions.h' line '282'.
> I have attached the p4 code, the switch log and the json file and would
> appreciate your help on why this happens and what should the fix be.
> _______________________________________________
> P4-dev mailing list
> P4-dev at lists.p4.org
> http://lists.p4.org/mailman/listinfo/p4-dev_lists.p4.org

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