[PATCH 0/5] selftests: net: fix false failures due to missing features and host interference

Aleksei Oladko
2026-01-20T23:06:15Z

Hi,

This series addresses several issues in the networking kselftests
that cause false-positive failures depending on the host environment,
kernel configuration, or library versions.

The main focus of these changes is to isolate tests from the host
environment (using namespaces) and to ensure proper fallback or
skipping when dependencies are missing.

Summary of changes:
1. Adds a check for cls_basic module in fib_tests. Without this
module, the test fails when attempting to add tc rules instead
of skipping.
2. Fixes ovs-dpctl.py to return a non-zero exit code when pyroute2
is too old. This allows pmtu.sh to correctly fall back to ovs-vsctl
instead of assuming the configuration was successful.
3,4. Move reuseport and pmtu.sh tests info dedicated network namespaces.
This prevents failures caused by port conflicts with host processes
or interference from host firewall rules.
5. Ensures io_uring is enabled via sysctl before running io_uring_zerocopy
test, preventing failures on systems where kernel.io_uring_disabled
is set.

Aleksei Oladko (3):
selftests: net: fib_tests: skip rp_filter test if cls_basic is
unavailable
selftests: net: make ovs-dpctl.py fail when pyroute2 is unsupported
selftests: net: io_uring_zerocopy: enable io_uring for the test

Konstantin Khorenko (2):
selftests: net: run reuseport tests in netns to avoid port conflicts
selftests: net: run pmtu.sh in netns to avoid host firewall
interference

tools/testing/selftests/net/Makefile | 14 +++++++++-----
tools/testing/selftests/net/fib_tests.sh | 2 ++
.../testing/selftests/net/io_uring_zerocopy_tx.sh | 9 +++++++++
.../testing/selftests/net/openvswitch/ovs-dpctl.py | 2 +-
tools/testing/selftests/net/pmtu_wrapper.sh | 4 ++++
tools/testing/selftests/net/reuseport_bpf.sh | 4 ++++
tools/testing/selftests/net/reuseport_bpf_cpu.sh | 4 ++++
tools/testing/selftests/net/reuseport_bpf_numa.sh | 4 ++++
tools/testing/selftests/net/reuseport_dualstack.sh | 4 ++++
9 files changed, 41 insertions(+), 6 deletions(-)
create mode 100755 tools/testing/selftests/net/pmtu_wrapper.sh
create mode 100755 tools/testing/selftests/net/reuseport_bpf.sh
create mode 100755 tools/testing/selftests/net/reuseport_bpf_cpu.sh
create mode 100755 tools/testing/selftests/net/reuseport_bpf_numa.sh
create mode 100755 tools/testing/selftests/net/reuseport_dualstack.sh

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2.43.0