Add PTF tests for basic forwarding exercise # 1 by aqn96 · Pull Request #730 · p4lang/tutorials

aqn96 · 2026-03-14T23:29:01Z

Addresses part of #103 issue (exercise 1 tests)

Adds automated PTF tests for the basic exercise that run against solution/basic.p4.

What's included:

ptf/basic_fwd.py — Three tests:
- DropTest — verifies packets are dropped with no table entries (default action)
- FwdTest — verifies single entry IPv4 forwarding with correct MAC rewrite and TTL decrement
- MultiEntryTest — verifies multiple LPM entries route to correct ports
runptf.sh — compiles the solution, starts simple_switch_grpc, runs PTF tests, cleans up
.gitignore — excludes build artifacts and log files
README update with instructions for running the tests

Setup required:

veth interfaces must be created before running tests. Use veth_setup.sh from p4-guide or behavioral-model
runptf.sh currently references ~/p4-guide/testlib for p4runtime_shell_utils.py. Open to suggestions on the best way to handle this dependency.

Next steps:

Add edge case tests (LPM tiebreaker, TTL boundary, non-IPv4 packets)

Test results:

aqn96 · 2026-03-14T23:35:49Z

Hi @jafingerhut , this is a draft with the initial tests for the basic exercise (exercise 1). Before I add more tests (edge cases), I would appreciate any feedback on the overall approach. Also how you would like the testlib and veth_setup.sh dependencies be handled because they are external from the tutorial repo. I am happy to adjust.

aqn96 · 2026-03-15T00:33:24Z

exercises/basic/runptf.sh

+# Tests run against the solution P4 program.
+
+# Path to p4runtime_shell_utils and testlib
+T="`realpath ~/p4-guide/testlib`"


I cloned jafingerhut's p4-guide repo to hardcode the path here. This isn't in the tutorial repo. I would like some suggestions on how to handle this dependency.

You should copy any files needed from the p4-guide repo into this one. I think you only use a couple of them. The license should be Apache 2 in them already, or if not, I can add that explicitly.

Before you copy in the contents of the p4-guide/testutils directory, though, try deleting this line from the Python file:

import p4runtime_shell_utils as shu

I do not think your Python code uses the imported package at all, as far as I can tell, so you should not need it, which is good.

I confirmed locally on my system with this PR's changes, but in addition my own local edits that deleted this line from the PTF test:

import p4runtime_shell_utils as shu

and removing these lines from runptf.sh:

T="`realpath ~/p4-guide/testlib`" if [ x"${PYTHONPATH}" == "x" ] then P="${T}" else P="${T}:${PYTHONPATH}" fi

and also later remove the command line options --pypath "$P" from the ptf command line, that the PTF test passes. I read through the code of the PTF test, and looked at the simple_switch log, and it looks like everything else is good there.

Please remove those things from this PR, as they are unnecessary.

Hi @aqn96,

If I remember correctly, Andy developed these libraries for his repositories and for testing/playing with different setups. However, p4runtime_shell_utils does not exist in the tutorials repository. The equivalent there should be p4runtime_lib: https://github.com/p4lang/tutorials/tree/a36df0a61d7a60f1fbb3c212a46b828f8b1e4fc3/utils

These examples show howp4runtime_libcan be used to configure a switch.

https://github.com/p4lang/tutorials/blob/master/exercises/p4runtime/mycontroller.py#L15

https://github.com/p4lang/tutorials/blob/master/exercises/flowcache/mycontroller.py#L23

Right. Except that for the moment, at least, the PTF test in this PR uses neither of those, and that is perfectly OK. It doesn't need anything provided by either of them.

Hi @Dscano, thanks for the feedback! That makes sense. I'll refactor to use p4runtime_lib from the tutorials repo instead of the external testlib.

aqn96 · 2026-03-15T00:35:48Z

exercises/basic/README.md

+./runptf.sh
+```
+
+Note: The `veth` interfaces must be set up before running. If you see


One dependency is the veth interfaces set up which i ran the script from the repo commented. How should i handle this dependency for this tutorial repo?

I think for now it would be best to create these new tests as things primarily for maintainers and contributors to this repository. I would prefer if we didn't mention them in the exercise README files yet that are intended for students using the tutorials.

imho you can add a make test in the

tutorials/utils/Makefile

Line 9 in a36df0a

RUN_SCRIPT = ../../utils/run_exercise.py

where basically you leverage the environment setup part from run and then you extend it with the test.

I also want to make sure I understand the make test suggestion correctly... are you thinking I should modify run_exercise.py to support a test mode like make a run_test.py where it reuses the environment setup from run_exercise.py (which handles interface creation) but runs PTF tests instead of spinning up Mininet?

Sorry, I didn’t explain myself properly. What I meant is that you could add a make test target to the Makefile. This would allow users to run a test, observe how the program behaves, and integrate it into an automated testing pipeline/ Github Actions CI.

The make test target could include all the scripts and commands needed to run the test, such as creating the veth pairs, starting the switch, and so on.

In summary, it would be great to have a way to automate test execution for each exercise, so that we can integrate it into a CI/CD pipeline.

fruffy · 2026-03-15T18:15:31Z

Once this is in we should create a Github action that runs this as part of CI.

aqn96 · 2026-03-15T19:04:38Z

Updated based on @Dscano's feedback:

Refactored basic_fwd.py to use p4runtime_lib from the tutorials repo instead of external p4runtime_sh and p4runtime_shell_utils
runptf.sh now handles veth creation and cleanup so no external setup needed
Added make test target to the exercise Makefile
Updated README to reflect make test as the new test command

All three tests pass:

Still a draft as I plan to add maybe a couple more edge cases, but will adjust anything based on further feedback.

@fruffy That would be a great next step. I'll look into setting up a GitHub Action once the test approach is finalized.

exercises/basic/ptf/basic_fwd.py

Dscano · 2026-03-16T21:26:11Z

@aqn96 overall looks good to me but I would like to test it locally, I'll do it asap. So if you want , in the meanwhile, you can aslo add the GitHub Action.

Signed-off-by: aqn96 <aqnguyen96@gmail.com> Signed-off-by: An <aqnguyen96@gmail.com>

…ained veth setup, add make test target to the Makerfile, updated the README.md to reflect changes Signed-off-by: aqn96 <aqnguyen96@gmail.com> Signed-off-by: An <aqnguyen96@gmail.com>

Signed-off-by: An <aqnguyen96@gmail.com>

aqn96 · 2026-03-17T01:42:16Z

Hi @Dscano @fruffy , I’ve updated this PR to include a fully automated CI pipeline for the basic forwarding exercise.

Features of this CI setup:

Automated PTF Testing: Every PR will now automatically run the basic_fwd.py test suite using the p4lang/p4c:latest container. Also install the necessary dependencies for the tests.
Privileged Networking: Configured the runner to use --privileged mode to allow for veth interface creation during testing.
Artifact Logging: Added a step to upload the BMv2 and P4Runtime logs (exercises/basic/logs/) as GitHub artifacts, to help future debugging.
Local Validation: I've verified this workflow locally using act to ensure it handles the dependency installations and test execution correctly.

Please feel free to give me feedback on this.

…header Signed-off-by: An <aqnguyen96@gmail.com>

aqn96 · 2026-03-17T07:40:40Z

Just added 3 more edge cases to the current test suite:

LpmTiebreakerTest: Validates that the switch correctly prioritizes the most specific route (LPM) when rules overlap.
TtlBoundaryTest: Confirms correct handling for packets entering with a TTL of 1 (verifying it doesn't forward with a negative or invalid value).
NonIpv4DropPacketTest: Ensures the parser effectively discriminates and isolates non-IPv4 traffic.

I also updated the basic_fwd.py header to include the SPDX-License-Identifier and the community copyright notice as requested by @Dscano. I think this is correct as it matches other files in the repo and will keep that in mind moving forward.

fruffy · 2026-03-18T01:52:36Z

@jafingerhut any comments?

Dscano · 2026-03-18T20:39:04Z

Hi @aqn96,

I have tested your code on VM P4 Tutorial Development 2025-04-01 , I got this:

(p4dev-python-venv) p4@p4dev:~/test/tutorials/exercises/basic$ make test
./runptf.sh
Creating veth interfaces...
+ mkdir -p build
+ p4c --target bmv2 --arch v1model --p4runtime-files build/basic.p4info.txtpb -o build solution/basic.p4
+ /bin/rm -f ss-log.txt
+ echo ''

+ echo 'Started simple_switch_grpc. Waiting 2 seconds before starting PTF test...'
Started simple_switch_grpc. Waiting 2 seconds before starting PTF test...
+ sleep 2
+ sudo simple_switch_grpc --log-file ss-log --log-flush --dump-packet-data 10000 -i 0@veth0 -i 1@veth2 -i 2@veth4 -i 3@veth6 -i 4@veth8 -i 5@veth10 -i 6@veth12 -i 7@veth14 --no-p4
Calling target program-options parser
Adding interface veth0 as port 0
Adding interface veth2 as port 1
Adding interface veth4 as port 2
Adding interface veth6 as port 3
Adding interface veth8 as port 4
Adding interface veth10 as port 5
Adding interface veth12 as port 6
Adding interface veth14 as port 7
Server listening on 0.0.0.0:9559
++ which ptf
+ sudo PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python /home/p4/src/p4dev-python-venv/bin/ptf -i 0@veth1 -i 1@veth3 -i 2@veth5 -i 3@veth7 -i 4@veth9 -i 5@veth11 -i 6@veth13 -i 7@veth15 '--test-params=grpcaddr='\''localhost:9559'\'';p4info='\''build/basic.p4info.txtpb'\'';config='\''build/basic.json'\''' --test-dir ptf
Using packet manipulation module: ptf.packet_scapy
2026-03-18 16:32:08,133 - root - INFO - Importing platform: eth
2026-03-18 16:32:08,134 - root - INFO - port map: {(0, 0): 'veth1', (0, 1): 'veth3', (0, 2): 'veth5', (0, 3): 'veth7', (0, 4): 'veth9', (0, 5): 'veth11', (0, 6): 'veth13', (0, 7): 'veth15'}
2026-03-18 16:32:08,134 - root - INFO - Autogen random seed: 606670
2026-03-18 16:32:08,135 - root - INFO - *** TEST RUN START: Wed Mar 18 16:32:08 2026
basic_fwd.DropTest ... ERROR

======================================================================
ERROR: basic_fwd.DropTest
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/p4/test/tutorials/exercises/basic/ptf/basic_fwd.py", line 63, in setUp
    self.sw = p4runtime_lib.bmv2.Bmv2SwitchConnection(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 75, in __init__
    interceptor = GrpcRequestLogger(proto_dump_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 228, in __init__
    with open(self.log_file, 'w') as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'logs/s1-p4runtime-requests.txt'

----------------------------------------------------------------------
Ran 1 test in 0.006s

FAILED (errors=1)
basic_fwd.FwdTest ... ERROR

======================================================================
ERROR: basic_fwd.FwdTest
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/p4/test/tutorials/exercises/basic/ptf/basic_fwd.py", line 63, in setUp
    self.sw = p4runtime_lib.bmv2.Bmv2SwitchConnection(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 75, in __init__
    interceptor = GrpcRequestLogger(proto_dump_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 228, in __init__
    with open(self.log_file, 'w') as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'logs/s1-p4runtime-requests.txt'

----------------------------------------------------------------------
Ran 1 test in 0.006s

FAILED (errors=1)
basic_fwd.MultiEntryTest ... ERROR

======================================================================
ERROR: basic_fwd.MultiEntryTest
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/p4/test/tutorials/exercises/basic/ptf/basic_fwd.py", line 63, in setUp
    self.sw = p4runtime_lib.bmv2.Bmv2SwitchConnection(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 75, in __init__
    interceptor = GrpcRequestLogger(proto_dump_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 228, in __init__
    with open(self.log_file, 'w') as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'logs/s1-p4runtime-requests.txt'

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)
basic_fwd.LpmTiebreakerTest ... ERROR

======================================================================
ERROR: basic_fwd.LpmTiebreakerTest
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/p4/test/tutorials/exercises/basic/ptf/basic_fwd.py", line 63, in setUp
    self.sw = p4runtime_lib.bmv2.Bmv2SwitchConnection(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 75, in __init__
    interceptor = GrpcRequestLogger(proto_dump_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 228, in __init__
    with open(self.log_file, 'w') as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'logs/s1-p4runtime-requests.txt'

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)
basic_fwd.TtlBoundaryTest ... ERROR

======================================================================
ERROR: basic_fwd.TtlBoundaryTest
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/p4/test/tutorials/exercises/basic/ptf/basic_fwd.py", line 63, in setUp
    self.sw = p4runtime_lib.bmv2.Bmv2SwitchConnection(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 75, in __init__
    interceptor = GrpcRequestLogger(proto_dump_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 228, in __init__
    with open(self.log_file, 'w') as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'logs/s1-p4runtime-requests.txt'

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)
basic_fwd.NonIpv4DropTest ... ERROR

======================================================================
ERROR: basic_fwd.NonIpv4DropTest
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/p4/test/tutorials/exercises/basic/ptf/basic_fwd.py", line 63, in setUp
    self.sw = p4runtime_lib.bmv2.Bmv2SwitchConnection(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 75, in __init__
    interceptor = GrpcRequestLogger(proto_dump_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/p4/test/tutorials/exercises/basic/ptf/../../../utils/p4runtime_lib/switch.py", line 228, in __init__
    with open(self.log_file, 'w') as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'logs/s1-p4runtime-requests.txt'

----------------------------------------------------------------------
Ran 1 test in 0.010s

FAILED (errors=1)

******************************************
ATTENTION: SOME TESTS DID NOT PASS!!!

The following tests errored:
DropTest, FwdTest, MultiEntryTest, LpmTiebreakerTest, TtlBoundaryTest, NonIpv4DropTest

******************************************
make: *** [Makefile:8: test] Error 1

When you run make run, the log folder is created and then removed by make clean, so make test should also create it. Please take a look to
https://github.com/p4lang/tutorials/blob/master/utils/Makefile#L46

jafingerhut

LGTM. I might want to factor out the veth_setup.sh and veth_teardown.sh into separate bash scripts later, but no need to do that before merging this.

jafingerhut · 2026-03-15T03:22:41Z

exercises/basic/runptf.sh

+# Tests run against the solution P4 program.
+
+# Path to p4runtime_shell_utils and testlib
+T="`realpath ~/p4-guide/testlib`"


You should copy any files needed from the p4-guide repo into this one. I think you only use a couple of them. The license should be Apache 2 in them already, or if not, I can add that explicitly.

jafingerhut · 2026-03-15T03:28:46Z

exercises/basic/runptf.sh

+# Tests run against the solution P4 program.
+
+# Path to p4runtime_shell_utils and testlib
+T="`realpath ~/p4-guide/testlib`"


Before you copy in the contents of the p4-guide/testutils directory, though, try deleting this line from the Python file:

import p4runtime_shell_utils as shu

I do not think your Python code uses the imported package at all, as far as I can tell, so you should not need it, which is good.

jafingerhut · 2026-03-15T06:41:23Z

exercises/basic/runptf.sh

+# Tests run against the solution P4 program.
+
+# Path to p4runtime_shell_utils and testlib
+T="`realpath ~/p4-guide/testlib`"


I confirmed locally on my system with this PR's changes, but in addition my own local edits that deleted this line from the PTF test:

import p4runtime_shell_utils as shu

and removing these lines from runptf.sh:

T="`realpath ~/p4-guide/testlib`" if [ x"${PYTHONPATH}" == "x" ] then P="${T}" else P="${T}:${PYTHONPATH}" fi

and also later remove the command line options --pypath "$P" from the ptf command line, that the PTF test passes. I read through the code of the PTF test, and looked at the simple_switch log, and it looks like everything else is good there.

Please remove those things from this PR, as they are unnecessary.

jafingerhut · 2026-03-15T06:44:40Z

exercises/basic/README.md

+./runptf.sh
+```
+
+Note: The `veth` interfaces must be set up before running. If you see


I think for now it would be best to create these new tests as things primarily for maintainers and contributors to this repository. I would prefer if we didn't mention them in the exercise README files yet that are intended for students using the tutorials.

jafingerhut · 2026-03-15T11:52:20Z

exercises/basic/runptf.sh

+# Tests run against the solution P4 program.
+
+# Path to p4runtime_shell_utils and testlib
+T="`realpath ~/p4-guide/testlib`"


Right. Except that for the moment, at least, the PTF test in this PR uses neither of those, and that is perfectly OK. It doesn't need anything provided by either of them.

aqn96 force-pushed the add-ptf-tests branch from 35a2e7d to 8485ec0 Compare March 14, 2026 23:30

Dscano requested review from Dscano and jafingerhut March 15, 2026 00:12

aqn96 commented Mar 15, 2026

View reviewed changes

Dscano reviewed Mar 16, 2026

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exercises/basic/ptf/basic_fwd.py Show resolved Hide resolved

aqn96 added 5 commits March 16, 2026 18:18

Add PTF test file for basic forwarding exercise

839bf32

Signed-off-by: aqn96 <aqnguyen96@gmail.com> Signed-off-by: An <aqnguyen96@gmail.com>

Add runptf.sh script for basic forwarding PTF tests

07b3c5c

Signed-off-by: aqn96 <aqnguyen96@gmail.com> Signed-off-by: An <aqnguyen96@gmail.com>

Add testing section to basic forwarding README

ec5d91a

Signed-off-by: aqn96 <aqnguyen96@gmail.com> Signed-off-by: An <aqnguyen96@gmail.com>

Refactor: use p4runtime_lib instead of external dependency, self-cont…

8a2b90e

…ained veth setup, add make test target to the Makerfile, updated the README.md to reflect changes Signed-off-by: aqn96 <aqnguyen96@gmail.com> Signed-off-by: An <aqnguyen96@gmail.com>

ci: add automated ptf testing for tutorial exercises

b58388e

Signed-off-by: An <aqnguyen96@gmail.com>

aqn96 force-pushed the add-ptf-tests branch from a68b579 to b58388e Compare March 17, 2026 01:19

ci: fix typo in the boost package name

8c916d8

Signed-off-by: An <aqnguyen96@gmail.com>

feat: add LPM Tiebreaker, TTL, and NonIpv4Drop tests; update license …

444bffe

…header Signed-off-by: An <aqnguyen96@gmail.com>

fruffy approved these changes Mar 18, 2026

View reviewed changes

aqn96 marked this pull request as ready for review March 18, 2026 02:00

jafingerhut approved these changes Mar 19, 2026

View reviewed changes

jafingerhut merged commit 3fc94e2 into p4lang:master Mar 19, 2026
2 checks passed

aqn96 deleted the add-ptf-tests branch March 19, 2026 05:42

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