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-rw-r--r--tools/testing/selftests/net/forwarding/README15
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/forwarding/README b/tools/testing/selftests/net/forwarding/README
index 7b41cff993ad..392a5a91ed37 100644
--- a/tools/testing/selftests/net/forwarding/README
+++ b/tools/testing/selftests/net/forwarding/README
@@ -57,6 +57,21 @@ o Code shall be checked using ShellCheck [1] prior to submission.
1. https://www.shellcheck.net/
+Cleanups
+--------
+
+o lib.sh brings in defer.sh (by way of ../lib.sh) by default. Consider
+ making use of the defer primitive to schedule automatic cleanups. This
+ makes it harder to forget to remove a temporary netdevice, kill a running
+ process or perform other cleanup when the test script is interrupted.
+
+o When adding a helper that dirties the environment, but schedules all
+ necessary cleanups through defer, consider prefixing it adf_ for
+ consistency with lib.sh and ../lib.sh helpers. This serves as an
+ immediately visible bit of documentation about the helper API.
+
+o Definitely do the above for any new code in lib.sh, if practical.
+
Customization
=============