[PATCH net-next v3 0/5] net: selftests: adjustments to ipv6_flowlabel_mgr

[Marcelo Mendes Spessoto Junior <marcelomspessoto@gmail.com>]

The ipv6_flowlabel_mgr test file was lacking coverage for the
IPV6_FL_A_RENEW action, and the IPV6_FL_F_REMOTE and IPV6_FL_F_REFLECT
flags. The first two patches from this set aim to add a proper test
case for RENEW and REMOTE.

The third patch was added to insert network namespace creation inside
the test suite, instead of relying on external wrapper scripts. This
change conforms to other net test implementations, such as
tools/testing/selftests/net/icmp_rfc4884.c, and it is important for
the fourth and fifth patches.

The fourth patch adds the IPV6_FL_F_REFLECT test.

The fifth patch proposes the adoption of "kselftest_harness.h" helpers,
improving code readability and conforming to the implementation of the most
recent selftests.

---
v3:
- Remove unused FL_MAX_LINGER variable
- Set flr_share explicitly for renew tests
- Add corner case for expect_fail_errno macro where test succeeds when
  it should've failed
- Add a new intermediate patch, between remote test patch and reflect test
  patch, placing the netns setup inside the test file
- Add missing skip for setuid fail, addressing stale code from harness
  migration
- Delimit EXPECT and ASSERT usage (use former when test can continue)
- Minor commit message rewording
- Apply more missing scripts/checkpath.pl fixes
v2:
- Apply missing scripts/checkpath.pl fixes and other formatting
  enhancements
- Add new basic IPV6_FL_A_RENEW tests
- Put label after IPV6_FL_F_REMOTE test, freeing the value for a
  subsequent test
- Delegate flowlabel_consistency configuration to wrapper sh script
  instead of doing it on the main test code
- Skip IPV6_FL_F_REFLECT tests if flowlabel_consistency is set,
  instead of failing the test or attempting to change it
- Compare resulting error for failure assertions
- https://lore.kernel.org/all/20260804025910.50145-1-marcelomspessoto@gmail.com/
v1:
- https://lore.kernel.org/all/20260727043516.93101-1-marcelospe@proton.me/

Marcelo Mendes Spessoto Junior (5):
  selftests: net: test IPV6_FL_A_RENEW
  selftests: net: test IPV6_FL_F_REMOTE
  selftests: net: create own netns in ipv6_flowlabel_mgr
  selftests: net: test IPV6_FL_F_REFLECT
  selftests: net: adopt harness for flow label mgr

 tools/testing/selftests/net/ipv6_flowlabel.sh |   2 +-
 .../selftests/net/ipv6_flowlabel_mgr.c        | 584 ++++++++++++++----
 2 files changed, 466 insertions(+), 120 deletions(-)

-- 
2.55.0