netdev - [PATCH net] selftests: mirror_gre_changes: Tighten up the TTL test match

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Date: Fri, 11 Aug 2023 17:59:27 +0200
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: <mlxsw@...dia.com>, Ido Schimmel <idosch@...dia.com>, Petr Machata
	<petrm@...dia.com>, Jiri Pirko <jiri@...nulli.us>, Mirsad Todorovac
	<mirsad.todorovac@....unizg.hr>
Subject: [PATCH net] selftests: mirror_gre_changes: Tighten up the TTL test match

This test verifies whether the encapsulated packets have the correct
configured TTL. It does so by sending ICMP packets through the test
topology and mirroring them to a gretap netdevice. On a busy host
however, more than just the test ICMP packets may end up flowing
through the topology, get mirrored, and counted. This leads to
potential spurious failures as the test observes much more mirrored
packets than the sent test packets, and assumes a bug.

Fix this by tightening up the mirror action match. Change it from
matchall to a flower classifier matching on ICMP packets specifically.

Fixes: 45315673e0c5 ("selftests: forwarding: Test changes in mirror-to-gretap")
Signed-off-by: Petr Machata <petrm@...dia.com>
Tested-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
---
 tools/testing/selftests/net/forwarding/mirror_gre_changes.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh b/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh
index aff88f78e339..5ea9d63915f7 100755
--- a/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh
+++ b/tools/testing/selftests/net/forwarding/mirror_gre_changes.sh
@@ -72,7 +72,8 @@ test_span_gre_ttl()
 
 	RET=0
 
-	mirror_install $swp1 ingress $tundev "matchall $tcflags"
+	mirror_install $swp1 ingress $tundev \
+		"prot ip flower $tcflags ip_prot icmp"
 	tc filter add dev $h3 ingress pref 77 prot $prot \
 		flower skip_hw ip_ttl 50 action pass
 
-- 
2.41.0