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

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Message-ID: <20260120230558.328423-1-aleksey.oladko@virtuozzo.com>
Date: Tue, 20 Jan 2026 23:05:53 +0000
From: Aleksei Oladko <aleksey.oladko@...tuozzo.com>
To: "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
        Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Aleksei Oladko <aleksey.oladko@...tuozzo.com>
Subject: [PATCH 0/5] selftests: net: fix false failures due to missing features and host interference

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

-- 
2.43.0