P4Check 16

P4Check 16 is a prototype implementation of the P4Check tool (for P4 14) described in our ECOOP paper.

P4Check is a static checker that eliminates references to invalid headers.

Building

• Install opam. Then run opam install dune
• Install dependencies indicated by the command

dune external-lib-deps --missing @all

For example opam install core.

N.B. To install petr4, follow the instructions here. However, you must run git checkout 0.1.1 first, so that you build the most recent release version and not the development version.

• Now you can build by running

make

which will produce an executable in ./p4check. You may need to run chmod +x ./p4check to provide it with executable permissions.

Examples

The following examples demonstrate the few important messages that p4check outputs

Passing P4 code

The following example, taken from the P4 Developer Day Tutorials should pass the typechecker.

./p4check examples/basic.p4 -I examples/includes

Failing P4 Code

The following modified example should complain about an invalid ipv4 instance

./p4check examples/basic_ipv4bug.p4 -I examples/includes

P4Check Warnings

The following command produces a warning that should be used to guide implementation of the controller

./p4check examples/basic_warningipv4.p4 -I examples/includes

Stress Testing

Running the following command shows the limits of our current implementation. The following is a cross-compiled version of switch.p4 using Barefoot Networks' p4_14_to_p4_16 compiler.

./p4check ./examples/open_switch.p4

If you want to observe the massive size of the types as the program is processed, run

./p4check -v ./examples/open_switch.p4