[PATCH bpf-next 0/6] selftests/bpf: integrate test_tcp_check_syncookie.sh into test_progs

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

Hello,
this series aims to bring test_tcp_check_syncookie.sh scope into
test_progs to make sure that the corresponding tests are also run
automatically in CI. This script tests for bpf_tcp_{gen,check}_syncookie
and bpf_skc_lookup_tcp, in different contexts (ipv4, v6 or dual, and
with tc and xdp programs).
Some other tests like btf_skc_cls_ingress have some overlapping tests with
test_tcp_check_syncookie.sh, so this series moves the missing bits from
test_tcp_check_syncookie.sh into btf_skc_cls_ingress, which is already
integrated into test_progs.
- the first three commits bring some minor improvements to
  btf_skc_cls_ingress without changing its testing scope
- fourth and fifth commits bring test_tcp_check_syncookie.sh features
  into btf_skc_cls_ingress
- last commit removes test_tcp_check_syncookie.sh

The only topic for which I am not sure for this integration is the
necessity or not to run the tests with different program types:
test_tcp_check_syncookie.sh runs tests with both tc and xdp programs, but
btf_skc_cls_ingress currently tests those helpers only with a tc
program. Would it make sense to also make sure that btf_skc_cls_ingress
is tested with all the programs types supported by those helpers ?

The series has been tested both in CI and in a local x86_64 qemu
environment:
  # ./test_progs -a btf_skc_cls_ingress
  #38/1    btf_skc_cls_ingress/conn_ipv4:OK
  #38/2    btf_skc_cls_ingress/conn_ipv6:OK
  #38/3    btf_skc_cls_ingress/conn_dual:OK
  #38/4    btf_skc_cls_ingress/syncookie_ipv4:OK
  #38/5    btf_skc_cls_ingress/syncookie_ipv6:OK
  #38/6    btf_skc_cls_ingress/syncookie_dual:OK
  #38      btf_skc_cls_ingress:OK
  Summary: 1/6 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Alexis Lothoré (eBPF Foundation) (6):
      selftests/bpf: factorize conn and syncookies tests in a single runner
      selftests/bpf: add missing ns cleanups in btf_skc_cls_ingress
      selftests/bpf: get rid of global vars in btf_skc_cls_ingress
      selftests/bpf: add ipv4 and dual ipv4/ipv6 support in btf_skc_cls_ingress
      selftests/bpf: test MSS value returned with bpf_tcp_gen_syncookie
      selftests/bpf: remove test_tcp_check_syncookie

 tools/testing/selftests/bpf/.gitignore             |   1 -
 tools/testing/selftests/bpf/Makefile               |   9 +-
 .../selftests/bpf/prog_tests/btf_skc_cls_ingress.c | 265 +++++++++++++--------
 .../selftests/bpf/progs/test_btf_skc_cls_ingress.c |  83 +++++--
 .../bpf/progs/test_tcp_check_syncookie_kern.c      | 167 -------------
 .../selftests/bpf/test_tcp_check_syncookie.sh      |  85 -------
 .../selftests/bpf/test_tcp_check_syncookie_user.c  | 213 -----------------
 7 files changed, 222 insertions(+), 601 deletions(-)
---
base-commit: 030207b7fce8bad6827615cfc2c6592916e2c336
change-id: 20241015-syncookie-ea7686264586

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