netdev - [PATCH net-next 04/10] selftests: drivers: hw: Fix ethtool

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Message-ID: <837240b7d73895731a3e66a2affd9f0aac74cc10.1712940759.git.petrm@nvidia.com>
Date: Fri, 12 Apr 2024 19:03:07 +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: Ido Schimmel <idosch@...dia.com>, Shuah Khan <shuah@...nel.org>,
	<linux-kselftest@...r.kernel.org>, Petr Machata <petrm@...dia.com>,
	<mlxsw@...dia.com>, Vladimir Oltean <vladimir.oltean@....com>, "Tobias
 Waldekranz" <tobias@...dekranz.com>
Subject: [PATCH net-next 04/10] selftests: drivers: hw: Fix ethtool_rmon

When rx-pktsNtoM reports a range that involves very low-valued range, such
as 0-64, the calculated length of the packet will be -4, because FCS is
subtracted from the value. mausezahn then confuses the value for an option
and bails out. As a result, the test dumps many mausezahn error messages.

Instead, cap the value at 0. mausezahn will use an appropriate minimum
packet length.

Cc: Vladimir Oltean <vladimir.oltean@....com>
Cc: Tobias Waldekranz <tobias@...dekranz.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
---
 tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
index e2a1c10d3503..8f60c1685ad4 100755
--- a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
+++ b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
@@ -44,6 +44,7 @@ bucket_test()
 	# Mausezahn does not include FCS bytes in its length - but the
 	# histogram counters do
 	len=$((len - ETH_FCS_LEN))
+	len=$((len > 0 ? len : 0))
 
 	before=$(ethtool --json -S $iface --groups rmon | \
 		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")
-- 
2.43.0