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selftests: net: Skip so_incoming_cpu on single-CPU systems

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The test requires at least two CPUs to exercise the distribution of
connections between per-CPU listeners.  It currently enforces this
prerequisite with an assertion, causing all test cases to fail on
single-vCPU systems even though no kernel functionality was tested.

Report the unsupported environment as a skip instead.  Check the
prerequisite before setting up the network namespace so skipped tests do
not make unnecessary system changes.

Link: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/2023546

Signed-off-by: Kuba Pawlak <kuba.pawlak@canonical.com>
Link: https://patch.msgid.link/20260904140334.562593-1-kuba.pawlak@canonical.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuba Pawlak 2026-09-04 16:03:34 +02:00 committed by Jakub Kicinski
parent 1c9c07d0ad
commit 5bb36cd120
1 changed files with 4 additions and 3 deletions
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7
tools/testing/selftests/net/so_incoming_cpu.c
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@ -81,10 +81,11 @@ static int nr_client_per_server, nr_server, nr_client;
FIXTURE_SETUP(so_incoming_cpu)
{
setup_netns(_metadata);
nr_server = get_nprocs();
ASSERT_LE(2, nr_server);
if (nr_server < 2)
SKIP(return, "requires at least two CPUs");
setup_netns(_metadata);
if (NR_CLIENT_PER_SERVER_DEFAULT * nr_server < NR_PORT)
nr_client_per_server = NR_CLIENT_PER_SERVER_DEFAULT;