[Devel] [PATCH RHEL10 COMMIT] selftests: net: l2tp: ensure required modules are loaded

[Konstantin Khorenko <khorenko@virtuozzo.com>]

The commit is pushed to "branch-rh10-6.12.0-211.39.1.16.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh10-6.12.0-211.39.1.16.3.vz10
------>
commit 77604b60d0e87b5df9bfaa21fb4acf457fe65345
Author: Aleksei Oladko <aleksey.oladko@virtuozzo.com>
Date:   Sun Jan 4 01:50:26 2026 +0000

    selftests: net: l2tp: ensure required modules are loaded
    
    The net kselftest l2tp.sh fails when the required l2tp kernel modules
    are not loaded beforehand: the test aborts in setup(), which runs under
    "set -e", and not a single testcase is executed:
    
      # ./l2tp.sh
      RTNETLINK answers: No such file or directory
      Error talking to the kernel
    
    The kernel does try to load the modules on demand, but
    l2tp_netlink/l2tp_eth/l2tp_ip/l2tp_ip6 modules are blacklisted and
    cannot be autoloaded.
    See https://access.redhat.com/articles/3760101 for the rationale.
    
    So load the required modules explicitly by name before running the
    tests, and skip the test if they are not available.
    
    Loading l2tp_eth and l2tp_ip6 is enough, module dependencies pull in
    l2tp_netlink, l2tp_core and l2tp_ip.
    
    With the modules loaded l2tp.sh passes all of its 16 testcases.
    
    https://virtuozzo.atlassian.net/browse/VSTOR-121804
    Feature: Fix selftests
    Signed-off-by: Aleksei Oladko <aleksey.oladko@virtuozzo.com>
---
 tools/testing/selftests/net/l2tp.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/net/l2tp.sh b/tools/testing/selftests/net/l2tp.sh
index 88de7166c8ae9..0927056b92689 100755
--- a/tools/testing/selftests/net/l2tp.sh
+++ b/tools/testing/selftests/net/l2tp.sh
@@ -369,6 +369,9 @@ do
 	esac
 done
 
+modprobe l2tp_eth || exit $ksft_skip
+modprobe l2tp_ip6 || exit $ksft_skip
+
 run_tests
 cleanup