The kci_test_encap_fou() test from kci_test_encap() in rtnetlink.sh
needs the fou module to work. Otherwise it will fail with:

  $ ip netns exec "$testns" ip fou add port 7777 ipproto 47
  RTNETLINK answers: No such file or directory
  Error talking to the kernel

Add the CONFIG_NET_FOU into the config file as well. Which needs at
least to be set as a loadable module.

Signed-off-by: Po-Hsu Lin <po-hsu....@canonical.com>
---
 tools/testing/selftests/net/config       | 1 +
 tools/testing/selftests/net/rtnetlink.sh | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/tools/testing/selftests/net/config 
b/tools/testing/selftests/net/config
index 3b42c06b..c5e50ab 100644
--- a/tools/testing/selftests/net/config
+++ b/tools/testing/selftests/net/config
@@ -31,3 +31,4 @@ CONFIG_NET_SCH_ETF=m
 CONFIG_NET_SCH_NETEM=y
 CONFIG_TEST_BLACKHOLE_DEV=m
 CONFIG_KALLSYMS=y
+CONFIG_NET_FOU=m
diff --git a/tools/testing/selftests/net/rtnetlink.sh 
b/tools/testing/selftests/net/rtnetlink.sh
index 7c38a90..a711b3e 100755
--- a/tools/testing/selftests/net/rtnetlink.sh
+++ b/tools/testing/selftests/net/rtnetlink.sh
@@ -520,6 +520,11 @@ kci_test_encap_fou()
                return $ksft_skip
        fi
 
+       if ! /sbin/modprobe -q -n fou; then
+               echo "SKIP: module fou is not found"
+               return $ksft_skip
+       fi
+       /sbin/modprobe -q fou
        ip -netns "$testns" fou add port 7777 ipproto 47 2>/dev/null
        if [ $? -ne 0 ];then
                echo "FAIL: can't add fou port 7777, skipping test"
@@ -540,6 +545,7 @@ kci_test_encap_fou()
                return 1
        fi
 
+       /sbin/modprobe -q -r fou
        echo "PASS: fou"
 }
 
-- 
2.7.4

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