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From: Roger Quadros <rogerq@kernel.org>
To: davem@davemloft.net,
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	pabeni@redhat.com,
	shuah@kernel.org,
	vladimir.oltean@nxp.com
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	rogerq@kernel.org
Subject: [PATCH net-next v10 01/10] selftests: forwarding: ethtool_mm: support devices with higher rx-min-frag-size
Date: Mon, 18 Dec 2023 14:55:04 +0200
Message-Id: <20231218125513.52337-2-rogerq@kernel.org>
In-Reply-To: <20231218125513.52337-1-rogerq@kernel.org>
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From: Vladimir Oltean <vladimir.oltean@nxp.com>

Some devices have errata due to which they cannot report ETH_ZLEN (60)
in the rx-min-frag-size. This was foreseen of course, and lldpad has
logic that when we request it to advertise addFragSize 0, it will round
it up to the lowest value that is _actually_ supported by the hardware.

The problem is that the selftest expects lldpad to report back to us the
same value as we requested.

Make the selftest smarter by figuring out on its own what is a
reasonable value to expect.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
 .../selftests/net/forwarding/ethtool_mm.sh    | 37 ++++++++++++++++++-
 1 file changed, 35 insertions(+), 2 deletions(-)

Changelog:

v10: no change.
v9: no code change. Added Kselftest maintainer in Cc.
v8: no change. Moved to the beginning of series.
v7: initial commit

diff --git a/tools/testing/selftests/net/forwarding/ethtool_mm.sh b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
index 39e736f30322..6212913f4ad1 100755
--- a/tools/testing/selftests/net/forwarding/ethtool_mm.sh
+++ b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
@@ -155,15 +155,48 @@ manual_failed_verification_h2_to_h1()
 	manual_failed_verification $h2 $h1
 }
 
+smallest_supported_add_frag_size()
+{
+	local iface=$1
+	local rx_min_frag_size=
+
+	rx_min_frag_size=$(ethtool --json --show-mm $iface | \
+		jq '.[]."rx-min-frag-size"')
+
+	if [ $rx_min_frag_size -le 60 ]; then
+		echo 0
+	elif [ $rx_min_frag_size -le 124 ]; then
+		echo 1
+	elif [ $rx_min_frag_size -le 188 ]; then
+		echo 2
+	elif [ $rx_min_frag_size -le 252 ]; then
+		echo 3
+	else
+		echo "$iface: RX min frag size $rx_min_frag_size cannot be advertised over LLDP"
+		exit 1
+	fi
+}
+
+expected_add_frag_size()
+{
+	local iface=$1
+	local requested=$2
+	local min=$(smallest_supported_add_frag_size $iface)
+
+	[ $requested -le $min ] && echo $min || echo $requested
+}
+
 lldp_change_add_frag_size()
 {
 	local add_frag_size=$1
+	local pattern=
 
 	lldptool -T -i $h1 -V addEthCaps addFragSize=$add_frag_size >/dev/null
 	# Wait for TLVs to be received
 	sleep 2
-	lldptool -i $h2 -t -n -V addEthCaps | \
-		grep -q "Additional fragment size: $add_frag_size"
+	pattern=$(printf "Additional fragment size: %d" \
+			 $(expected_add_frag_size $h1 $add_frag_size))
+	lldptool -i $h2 -t -n -V addEthCaps | grep -q "$pattern"
 }
 
 lldp()
-- 
2.34.1