[PATCH net-next v4 0/2] selftests: Fix and migrate XDP feature test

[Bochao Cao via B4 Relay <devnull+bochaolucky.gmail.com@kernel.org>]

Fix DUT process tracking, readiness retries, and signal cleanup, then
move the XDP feature test to drivers/net/hw as requested during v3 review.
The NetDrvEpEnv runner uses configured DUT and remote interfaces and
reports detected-versus-advertised mismatches as test failures.

Collect results before teardown so the echo used to wake the DUT thread
cannot contaminate tester counters and cause a false XDP_DROP failure.

Changes in v4:
- Correct the description of the set -e readiness behavior.
- Handle signals arriving before DUT PID assignment, including QUIT/ABRT.
- Move the test and build rules to drivers/net/hw and use NetDrvEpEnv.
- Report feature mismatches as failures and sample counters before cleanup.

Testing on Ubuntu 7.0.0-30-generic:
- Built xdp_features; checked shell and Python syntax.
- Original and v4 REDIRECT/NDO_XMIT results matched in three repeated runs
  with GRO enabled and TX checksum offload disabled, as in the old setup.
- Confirmed default veth offload settings reproduce mismatches in both
  versions; these are not migration-specific regressions.
- After fixing cleanup counter contamination, XDP_DROP passed five runs
  and the complete six-test runner passed twice (12 passes, zero failures).
- SIGTERM interruption left no xdp_features processes, veths, or netns.
- Rebased onto net-next commit 8830e65ed46d; repeated the build, Python
  syntax, diff-check, and per-patch checkpatch validation.

Native-XDP hardware traffic testing remains unverified: the available
e1000e interface rejects native-mode attachment with EOPNOTSUPP.

Link: https://lore.kernel.org/r/20260904-xdp-dut-process-lifecycle-gmail-v3-1-5b7eee4f7009@gmail.com

Signed-off-by: Bochao Cao <bochaolucky@gmail.com>
---
Bochao Cao (2):
      selftests/bpf: Track test_xdp_features DUT processes
      selftests/net: Move XDP feature test to driver framework

 tools/testing/selftests/bpf/Makefile               |  11 +-
 tools/testing/selftests/bpf/test_xdp_features.sh   | 107 -----------------
 tools/testing/selftests/drivers/net/hw/.gitignore  |   3 +
 tools/testing/selftests/drivers/net/hw/Makefile    |  22 ++++
 .../net/hw/xdp_features.bpf.c}                     |   0
 .../{bpf => drivers/net/hw}/xdp_features.c         | 126 +++++++++++++++------
 .../{bpf => drivers/net/hw}/xdp_features.h         |   0
 .../selftests/drivers/net/hw/xdp_features.py       | 109 ++++++++++++++++++
 8 files changed, 226 insertions(+), 152 deletions(-)
---
base-commit: 8830e65ed46de41f849eefb8ba227d4852c460f6
change-id: 20260921-xdp-features-v4-send-2c0da5db22d7

Best regards,
-- 
Bochao Cao <bochaolucky@gmail.com>