[PATCH nft v2 3/3] tests/shell: skip "vlan_8021ad_tag" test on older kernels

[Thomas Haller <thaller@redhat.com>]

The "vlan_8021ad_tag" test can only pass with certain (recent) kernels.
Conditionally exit with status 77, if "eval-exit-code" determines that
we don't have a suitable kernel version.

In this case, we can find the fixes in:

 v6.6      : https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af84f9e447a65b4b9f79e7e5d69e19039b431c56
 v6.5.7    : https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3f6a5636a96687381b329649950f21258bae380d

Fixes: 74cf3d16d8e9 ('tests: shell: add vlan match test case')
Signed-off-by: Thomas Haller <thaller@redhat.com>
---
 tests/shell/testcases/packetpath/vlan_8021ad_tag | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tests/shell/testcases/packetpath/vlan_8021ad_tag b/tests/shell/testcases/packetpath/vlan_8021ad_tag
index 379a5710c1cb..6d908fe330df 100755
--- a/tests/shell/testcases/packetpath/vlan_8021ad_tag
+++ b/tests/shell/testcases/packetpath/vlan_8021ad_tag
@@ -47,4 +47,10 @@ EOF
 ip netns exec "$ns1" ping -c 1 10.1.1.2
 
 ip netns exec "$ns2" $NFT list ruleset
-ip netns exec "$ns2" $NFT list chain netdev t c | grep 'counter packets 1 bytes 84'
+OUT="$(ip netns exec "$ns2" $NFT list chain netdev t c)"
+
+if ! printf "%s" "$OUT" | grep -q 'counter packets 1 bytes 84' ; then
+	echo "Filter did not match. Missing https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af84f9e447a65b4b9f79e7e5d69e19039b431c56 ?"
+	"$NFT_TEST_BASEDIR/helpers/eval-exit-code" kernel  6.6  6.5.7
+	exit $?
+fi
-- 
2.41.0