The tc_flower_cfm.sh selftest assume the presence of iproute2
support for the `cfm` keyword in `tc filter` commands. These
assumptions can cause test failures.

This patch improves test robustness by skipping the test if
tc filter help does not mention CFM

Signed-off-by: Aleksei Oladko <aleksey.oladko@virtuozzo.com>
---
 tools/testing/selftests/net/forwarding/tc_flower_cfm.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh b/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh
index 3ca20df952eb..65f95fe88b38 100755
--- a/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh
+++ b/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh
@@ -196,6 +196,8 @@ cleanup()
 	vrf_cleanup
 }
 
+run_cmd_grep 'CFM' tc filter add dev lo ingress flower help || exit $ksft_skip
+
 trap cleanup EXIT
 
 setup_prepare
-- 
2.43.0