selftests: net: fou_mcast_encap: load the fou module

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setup_ipv4() creates a GRETAP tunnel with FOU encap and configures a FOU
port via "ip fou add". Both require the fou module, which cannot be
auto-loaded.

The test assumes CONFIG_NET_FOU=y, which matches the default selftests
config, but fails on kernels built with CONFIG_NET_FOU=m. Without the fou
module, tunnel creation fails and the test reports a false failure with
0/100 received packets:

  RTNETLINK answers: Invalid argument
  TEST: FOU/GRETAP IPv4 multicast encap resubmit (received 0/100)  [FAIL]

Load the fou module and skip the subtest cleanly when unavailable. This
matches the existing fou6 handling in this script and the pattern used in
pmtu.sh.

modprobe is a no-op when CONFIG_NET_FOU=y, so default selftest builds
remain unchanged.

Signed-off-by: Qingshuang Fu <fuqingshuang@kylinos.cn>
Link: https://patch.msgid.link/20260917033049.792209-1-fuqingshuang@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

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Qingshuang Fu 2026-09-17 11:30:49 +08:00 • committed by Jakub Kicinski

parent 4c1b44ac22

commit 6e0ee63cd2

1 changed files with 7 additions and 4 deletions

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tools/testing/selftests/net/fou_mcast_encap.sh

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