netdev - Re: [PATCH net 10/17] selftests: forwarding: ethtool

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Date: Wed, 2 Aug 2023 13:52:43 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, petrm@...dia.com,
	razor@...ckwall.org, mirsad.todorovac@....unizg.hr
Subject: Re: [PATCH net 10/17] selftests: forwarding: ethtool_mm: Skip when
 using veth pairs

Hi Ido,

On Wed, Aug 02, 2023 at 10:51:11AM +0300, Ido Schimmel wrote:
> MAC Merge cannot be tested with veth pairs, resulting in failures:
> 
>  # ./ethtool_mm.sh
>  [...]
>  TEST: Manual configuration with verification: swp1 to swp2          [FAIL]
>          Verification did not succeed
> 
> Fix by skipping the test when used with veth pairs.
> 
> Fixes: e6991384ace5 ("selftests: forwarding: add a test for MAC Merge layer")
> Reported-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
> Closes: https://lore.kernel.org/netdev/adc5e40d-d040-a65e-eb26-edf47dac5b02@alu.unizg.hr/
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Tested-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
> ---

That will skip the selftest just for veth pairs. This will skip it for
any device that doesn't support the MAC Merge layer:

diff --git a/tools/testing/selftests/net/forwarding/ethtool_mm.sh b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
index c580ad623848..5432848a3c59 100755
--- a/tools/testing/selftests/net/forwarding/ethtool_mm.sh
+++ b/tools/testing/selftests/net/forwarding/ethtool_mm.sh
@@ -224,6 +224,8 @@ h1_create()
 		hw 1

 	ethtool --set-mm $h1 pmac-enabled on tx-enabled off verify-enabled off
+
+	h1_created=yes
 }

 h2_create()
@@ -236,10 +238,16 @@ h2_create()
 		queues 1@0 1@1 1@2 1@3 \
 		fp P E E E \
 		hw 1
+
+	h2_created=yes
 }

 h1_destroy()
 {
+	if ! [[ $h1_created = yes ]]; then
+		return
+	fi
+
 	ethtool --set-mm $h1 pmac-enabled off tx-enabled off verify-enabled off

 	tc qdisc del dev $h1 root
@@ -249,6 +257,10 @@ h1_destroy()

 h2_destroy()
 {
+	if ! [[ $h2_created = yes ]]; then
+		return
+	fi
+
 	tc qdisc del dev $h2 root

 	ethtool --set-mm $h2 pmac-enabled off tx-enabled off verify-enabled off
@@ -266,6 +278,14 @@ setup_prepare()
 	h1=${NETIFS[p1]}
 	h2=${NETIFS[p2]}

+	for netif in ${NETIFS[@]}; do
+		ethtool --show-mm $netif 2>&1 &> /dev/null
+		if [[ $? -ne 0 ]]; then
+			echo "SKIP: $netif does not support MAC Merge"
+			exit $ksft_skip
+		fi
+	done
+
 	h1_create
 	h2_create
 }
--
2.34.1

I assume that both situations are equally problematic, and not just veth?