On Fri, Jan 19, 2024 at 4:23 AM Eduard Zingerman eddyz87@gmail.com wrote:
On Fri, 2024-01-19 at 16:04 +0800, Shung-Hsi Yu wrote:
[...]
Final goal would be have BPF selftests compiled and test against our own kernel, without having to come up with a specific kernel flavor that is used to build and run the selftest. For v5.14 and v5.19-based kernel it works: compilation is successful and I was able to run the verifier tests. (Did not try running the other tests though)
You mean ./test_verifier binary, right? A lot of tests had been moved from ./test_verifier to ./test_progs since.
As far as I understand, selftests are supposed to be built and run using specific configuration, here is how config for x86 CI is prepared:
./scripts/kconfig/merge_config.sh \ ./tools/testing/selftests/bpf/config \ ./tools/testing/selftests/bpf/config.vm \ ./tools/testing/selftests/bpf/config.x86_64
(root is kernel source). I'm not sure if other configurations are supposed to be supported.
Would it make sense to have makefile target that builds/runs a smaller subset of general, config-agnostic selftests that tests the core feature (e.g. verifier + instruction set)?
In ideal world I'd say that ./test_progs should include/exclude tests conditioned on current configuration, but I don't know how much work would it be to adapt build system for this.
I would also suggest skipping building the specific bpf test code when a specific CONFIG is removed, sometimes I only want to test some bpf selftests code I am interested in :)