[PATCH bpf-next v3 00/14] selftests/bpf: migrate test_flow_dissector.sh to test_progs

["Alexis Lothoré (eBPF Foundation)" <alexis.lothore@bootlin.com>]

Hello,
this is the revision 3 of test_flow_dissector_migration.sh into
test_progs. This revision addresses comments from Stanislas, especially
about proper reuse of pseudo-header checksuming in new network helpers.

There are 2 "main" parts in test_flow_dissector.sh:
- a set of tests checking flow_dissector programs attachment to either
  root namespace or non-root namespace
- dissection test

The first set is integrated in flow_dissector.c, which already contains
some existing tests for flow_dissector programs. This series uses the
opportunity to update a bit this file (use new assert, re-split tests,
etc)
The second part is migrated into a new file under test_progs,
flow_dissector_classification.c. It uses the same eBPF programs as
flow_dissector.c, but the difference is rather about how those program
are executed:
- flow_dissector.c manually runs programs with BPF_PROG_RUN
- flow_dissector_classification.c sends real packets to be dissected, and
  so it also executes kernel code related to eBPF flow dissector (eg:
__skb_flow_bpf_to_target)

---
Changes in v3:
- Keep new helpers name in sync with kernel ones
- Document some existing network helpers
- Properly reuse pseudo-header csum helper in transport layer csum
  helper
- Drop duplicate assert
- Use const for test structure in the migrated test
- Simplify shutdown callchain for basic test
- collect Acked-by
- Link to v2: https://lore.kernel.org/r/20241114-flow_dissector-v2-0-ee4a3be3de65@bootlin.com

Changes in v2:
- allow tests to run in parallel
- move some generic helpers to network_helpers.h
- define proper function for ASSERT_MEMEQ
- fetch acked-by tags
- Link to v1: https://lore.kernel.org/r/20241113-flow_dissector-v1-0-27c4df0592dc@bootlin.com

---
Alexis Lothoré (eBPF Foundation) (14):
      selftests/bpf: add a macro to compare raw memory
      selftests/bpf: use ASSERT_MEMEQ to compare bpf flow keys
      selftests/bpf: replace CHECK calls with ASSERT macros in flow_dissector test
      selftests/bpf: re-split main function into dedicated tests
      selftests/bpf: expose all subtests from flow_dissector
      selftests/bpf: add gre packets testing to flow_dissector
      selftests/bpf: migrate flow_dissector namespace exclusivity test
      selftests/bpf: Enable generic tc actions in selftests config
      selftests/bpf: move ip checksum helper to network helpers
      selftests/bpf: document pseudo-header checksum helpers
      selftests/bpf: use the same udp and tcp headers in tests under test_progs
      selftests/bpf: add network helpers to generate udp checksums
      selftests/bpf: migrate bpf flow dissectors tests to test_progs
      selftests/bpf: remove test_flow_dissector.sh

 tools/testing/selftests/bpf/.gitignore             |   1 -
 tools/testing/selftests/bpf/Makefile               |   3 +-
 tools/testing/selftests/bpf/config                 |   1 +
 tools/testing/selftests/bpf/network_helpers.c      |   2 +-
 tools/testing/selftests/bpf/network_helpers.h      |  96 +++
 .../selftests/bpf/prog_tests/flow_dissector.c      | 323 +++++++--
 .../bpf/prog_tests/flow_dissector_classification.c | 792 +++++++++++++++++++++
 .../testing/selftests/bpf/prog_tests/sockopt_sk.c  |   2 +-
 .../testing/selftests/bpf/prog_tests/xdp_bonding.c |   2 +-
 .../selftests/bpf/prog_tests/xdp_do_redirect.c     |   2 +-
 .../selftests/bpf/prog_tests/xdp_flowtable.c       |   2 +-
 .../selftests/bpf/prog_tests/xdp_metadata.c        |  21 +-
 .../selftests/bpf/progs/test_cls_redirect.c        |   2 +-
 .../selftests/bpf/progs/test_cls_redirect.h        |   2 +-
 .../selftests/bpf/progs/test_cls_redirect_dynptr.c |   2 +-
 tools/testing/selftests/bpf/test_flow_dissector.c  | 780 --------------------
 tools/testing/selftests/bpf/test_flow_dissector.sh | 178 -----
 tools/testing/selftests/bpf/test_progs.c           |  15 +
 tools/testing/selftests/bpf/test_progs.h           |  15 +
 tools/testing/selftests/bpf/xdp_hw_metadata.c      |   2 +-
 20 files changed, 1176 insertions(+), 1067 deletions(-)
---
base-commit: 8e403f7465a7c73e3a8ef62bba8cd75ef525e4b1
change-id: 20241019-flow_dissector-3eb0c07fc163

Best regards,
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com