[PATCH v1 bpf-next 0/9] bpftool: Add end-to-end testing

[Manu Bretelle <chantr4@gmail.com>]

This series introduce a more ergonomic end-to-end testing for `bpftool`.

While there is already some `bpftool` tests, they are so far shallow
tests, validating features (test_bpftool.py), or validating expectations
by mean of grepping for expected output in payload
(test_bpftool_metadata.sh), which is hard to extend.

`bpftool` being an operational tool, it is important to ensure that it
operates correctly and reliably when needed, e.g when dealing with
operational issues/incidents.
By performing end-to-end validation of `bpftool` functionalities, we can
ensure that no regression is introduced.

To improve testability, and make end-to-end testing easier, this series is
leveraging `libbpf-rs` [0], allowing us to leverage an existing testing
framework [1], and the ability to load and natively interact with bpf
programs, maps, struct_ops... and finally running `bpftool` command and
checking its output, behaviour, against a set of known expectations.

Currently, the series comes with a set of tests that validate basic
operations such as listing maps, and progs, dumping them, and being able
to attribute the pid that loaded/created those. For struct_ops, it tests
that we can list, dump, and also unregister them by id or name.


    test bpftool_tests::run_bpftool ... ok
    test bpftool_tests::run_bpftool_map_dump_id ... ok
    test bpftool_tests::run_bpftool_map_list ... ok
    test bpftool_tests::run_bpftool_map_pids ... ok
    test bpftool_tests::run_bpftool_prog_list ... ok
    test bpftool_tests::run_bpftool_prog_pids ... ok
    test bpftool_tests::run_bpftool_prog_show_id ... ok
    test bpftool_tests::run_bpftool_struct_ops_can_unregister_id ... ok
    test bpftool_tests::run_bpftool_struct_ops_can_unregister_name ... ok
    test bpftool_tests::run_bpftool_struct_ops_dump_name ... ok
    test bpftool_tests::run_bpftool_struct_ops_list ... ok

[0] https://docs.rs/libbpf-rs/latest/libbpf_rs/
[1] https://doc.rust-lang.org/book/ch11-00-testing.html

Manu Bretelle (9):
  bpftool: add testing skeleton
  bpftool: add libbpf-rs dependency and minimal bpf program
  bpftool: open and load bpf object
  bpftool: Add test to verify that pids are associated to maps.
  bpftool: add test for bpftool prog
  bpftool: test that we can dump and read the content of a map
  bpftool: Add struct_ops tests
  bpftool: Add bpftool_tests README.md
  bpftool: Add Makefile to facilitate bpftool_tests usage

 .../selftests/bpf/bpftool_tests/.gitignore    |   3 +
 .../selftests/bpf/bpftool_tests/Cargo.toml    |  14 +
 .../selftests/bpf/bpftool_tests/Makefile      |  22 +
 .../selftests/bpf/bpftool_tests/README.md     |  91 ++++
 .../selftests/bpf/bpftool_tests/build.rs      |  16 +
 .../bpftool_tests/src/bpf/bpftool_tests.bpf.c |  82 ++++
 .../bpf/bpftool_tests/src/bpf/vmlinux.h       |   1 +
 .../bpf/bpftool_tests/src/bpftool_tests.rs    | 408 ++++++++++++++++++
 .../selftests/bpf/bpftool_tests/src/main.rs   |   2 +
 9 files changed, 639 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/.gitignore
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/Cargo.toml
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/Makefile
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/README.md
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/build.rs
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/src/bpf/bpftool_tests.bpf.c
 create mode 120000 tools/testing/selftests/bpf/bpftool_tests/src/bpf/vmlinux.h
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/src/bpftool_tests.rs
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/src/main.rs

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2.39.3