This series fixes the XDP feature test and moves it to drivers/net/hw. The tester uses AF_PACKET, so the remote host does not need native XDP. Existing remote XDP programs and offload settings are left unchanged.
Changes since v5: - Fix control EOF handling and preserve existing XDP programs on attach failure in the initial cleanup patch. - Bound shell readiness, fix signal cleanup and namespace ownership, isolate tracepoint counters, and fail on capability mismatches. - Support a separate control network, use an atomic signal flag, return failure on interruption, and query capabilities after attachment. - Fix inherited source paths, host-tool selection and installed-header priority in the shared BPF build rules. - Use argv lists for local commands and SSH deployment. Remove the old ignore entry and fix the README heading. - Run veth XDP_TX when peer GRO is enabled without native XDP. Skip only when the peer has neither. This covers the case addressed by [1]. Tested on x86_64 Ubuntu with Linux 6.8.0-124-generic: - Normal and separate-output builds, relative inherited srctree, host bootstrap with target CC/LD disabled, and conflicting source headers. - Earlier baseline across three veth configurations: 17 PASS and 1 expected XDP_TX SKIP. - All six features with separate IPv4 and IPv6 control networks: 12 PASS. - Nine error/cleanup checks, six protocol/isolation checks, and DUT/tester attach-failure preservation checks passed. - Patch 2: two concurrent six-case runs and three repeated-TERM runs left no helper processes or namespaces. - SSH deployment and execution from a path containing spaces and a quote. - GRO-only XDP_TX: isolated veth modules with and without the one-line fix reproduce failure and success for both IPv4 and IPv6. The runner also passes the expected skip/failure/success checks with ethtool 5.16. - GCC -fanalyzer reported no diagnostics. Clang diagnostics were checked; the unused assignment was removed and model false positives documented. Tests used veth devices; physical-NIC testing remains unverified. [1] https://lists.openwall.net/netdev/2026/10/16/565 Previous version: https://lore.kernel.org/all/[email protected]/ Signed-off-by: Bochao Cao <[email protected]> --- Bochao Cao (5): selftests/bpf: Fix XDP feature test setup and teardown selftests/bpf: Track XDP test processes and isolate namespaces selftests/bpf: Send XDP feature probes with AF_PACKET selftests/net: Add a shared BPF skeleton rule selftests/net: Move the XDP feature test to drivers/net/hw tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 11 +- tools/testing/selftests/bpf/test_xdp_features.sh | 107 -- tools/testing/selftests/bpf/xdp_features.c | 719 -------------- tools/testing/selftests/drivers/net/README.rst | 19 + tools/testing/selftests/drivers/net/hw/.gitignore | 3 + tools/testing/selftests/drivers/net/hw/Makefile | 15 +- tools/testing/selftests/drivers/net/hw/config | 3 + .../net/hw/xdp_features.bpf.c} | 60 +- .../selftests/drivers/net/hw/xdp_features.c | 1023 ++++++++++++++++++++ .../{bpf => drivers/net/hw}/xdp_features.h | 1 + .../selftests/drivers/net/hw/xdp_features.py | 146 +++ .../selftests/drivers/net/lib/py/remote_ssh.py | 2 +- tools/testing/selftests/net/bpf.mk | 33 +- 14 files changed, 1266 insertions(+), 877 deletions(-) --- base-commit: 8df0638138d3e0344fd1fb36cf2d1ca1cf5028f0 change-id: 20261008-xdp-v5-send-20261008-301d0e1d3165 Best regards, -- Bochao Cao <[email protected]>
