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bpf, doc: howto use/run the BPF selftests

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I always forget howto run the BPF selftests. Thus, lets add that info
to the QA document.

Documentation was based on Cilium's documentation:
 http://cilium.readthedocs.io/en/latest/bpf/#verifying-the-setup

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Jesper Dangaard Brouer 2018-05-14 15:42:32 +02:00 • committed by Alexei Starovoitov
parent 5422283848
commit b7a27c3aaf
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Documentation/bpf/bpf_devel_QA.rst
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@ -417,6 +417,33 @@ submitted by the BPF maintainers to the stable maintainers.
Testing patches Testing patches
=============== ===============
Q: How to run BPF selftests
---------------------------
A: After you have booted into the newly compiled kernel, navigate to
the BPF selftests_ suite in order to test BPF functionality (current
working directory points to the root of the cloned git tree)::
$ cd tools/testing/selftests/bpf/
$ make
To run the verifier tests::
$ sudo ./test_verifier
The verifier tests print out all the current checks being
performed. The summary at the end of running all tests will dump
information of test successes and failures::
Summary: 418 PASSED, 0 FAILED
In order to run through all BPF selftests, the following command is
needed::
$ sudo make run_tests
See the kernels selftest `Documentation/dev-tools/kselftest.rst`_
document for further documentation.
Q: Which BPF kernel selftests version should I run my kernel against? Q: Which BPF kernel selftests version should I run my kernel against?
--------------------------------------------------------------------- ---------------------------------------------------------------------
A: If you run a kernel ``xyz``, then always run the BPF kernel selftests A: If you run a kernel ``xyz``, then always run the BPF kernel selftests
@ -607,5 +634,7 @@ when:
.. _netdev FAQ: ../networking/netdev-FAQ.txt .. _netdev FAQ: ../networking/netdev-FAQ.txt
.. _samples/bpf/: ../../samples/bpf/ .. _samples/bpf/: ../../samples/bpf/
.. _selftests: ../../tools/testing/selftests/bpf/ .. _selftests: ../../tools/testing/selftests/bpf/
.. _Documentation/dev-tools/kselftest.rst:
https://www.kernel.org/doc/html/latest/dev-tools/kselftest.html
Happy BPF hacking! Happy BPF hacking!