Hi all, Both tc_links.c and tc_opts.c do their tests on the loopback interface. It prevents from parallelizing their executions. Use namespaces and the new append_tid() helper to allow this parallelization. Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@xxxxxxxxxxx> --- Bastien Curutchet (eBPF Foundation) (3): selftests/bpf: tc_helpers: Add create_and_open_tid_ns() selftests/bpf: tc_link/tc_opts: Use unique namespace selftests/bpf: tc_links/tc_opts: Serialize tests .../testing/selftests/bpf/prog_tests/tc_helpers.h | 12 ++ tools/testing/selftests/bpf/prog_tests/tc_links.c | 164 +++++++++++++-- tools/testing/selftests/bpf/prog_tests/tc_opts.c | 230 ++++++++++++++++++--- 3 files changed, 361 insertions(+), 45 deletions(-) --- base-commit: cfed0f474a4bb2f12b54de5d6a7301cfb7dc0dbd change-id: 20250128-tc_links-d894a23b7063 Best regards, -- Bastien Curutchet (eBPF Foundation) <bastien.curutchet@xxxxxxxxxxx>