[PATCH net v2 2/2] selftests: net: check failed rps_default_mask writes
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From: Yingjie Wang <hidden>
Date: 2026-10-29 15:10:40
Also in:
linux-kselftest, lkml
Subsystem:
kernel selftest framework, networking [general], the rest · Maintainers:
Shuah Khan, Shuah Khan, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
A failed write to rps_default_mask must not change the configured value. Add a case with a valid low chunk followed by an invalid high chunk. The old handler leaves the low chunk installed before returning an error, whereas the fixed handler retains the previous mask. Signed-off-by: Yingjie Wang <redacted> --- .../testing/selftests/net/rps_default_mask.sh | 23 +++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/tools/testing/selftests/net/rps_default_mask.sh b/tools/testing/selftests/net/rps_default_mask.sh
index b200019b3c80a..91e163fd25450 100755
--- a/tools/testing/selftests/net/rps_default_mask.sh
+++ b/tools/testing/selftests/net/rps_default_mask.sh@@ -45,8 +45,31 @@ chk_rps() { fi } +chk_rps_default_mask() { + local rps_mask expected_rps_mask=$2 + local msg=$1 + + rps_mask=$(cat /proc/sys/net/core/rps_default_mask) + printf "%-60s" "$msg" + + rps_mask=${rps_mask//,} + if [ "$rps_mask" -eq "$expected_rps_mask" ]; then + echo "[ ok ]" + else + echo "[fail] expected $expected_rps_mask found $rps_mask" + ret=1 + fi +} + trap cleanup EXIT +echo 1 > /proc/sys/net/core/rps_default_mask +if echo "zz,00000003" > /proc/sys/net/core/rps_default_mask 2>/dev/null; then + echo "invalid rps_default_mask write unexpectedly succeeded" + ret=1 +fi +chk_rps_default_mask "failed write doesn't change rps_default_mask" 1 + echo 0 > /proc/sys/net/core/rps_default_mask setup chk_rps "empty rps_default_mask" $NETNS lo 0
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2.43.0