[Devel] [PATCH vz10 1/3] selftests: net: Adapt ethtool mq tests to fix in qdisc graft

[Eva Kurchatova]

From: Victor Nogueira <victor at mojatatu.com>

Because of patch[1] the graft behaviour changed

So the command:

tcq replace parent 100:1 handle 204:

Is no longer valid and will not delete 100:4 added by command:

tcq replace parent 100:4 handle 204: pfifo_fast

So to maintain the original behaviour, this patch manually deletes 100:4
and grafts 100:1

Note: This change will also work fine without [1]

[1] https://lore.kernel.org/netdev/20250111151455.75480-1-jhs@mojatatu.com/T/#u

Signed-off-by: Victor Nogueira <victor at mojatatu.com>
Reviewed-by: Jamal Hadi Salim <jhs at mojatatu.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 0a5b8fff01bde1b9908f00004c676f2e2459333b)

https://virtuozzo.atlassian.net/browse/VSTOR-139651
Feature: fix selftests
Signed-off-by: Eva Kurchatova <eva.kurchatova at virtuozzo.com>
---
 .../selftests/drivers/net/netdevsim/tc-mq-visibility.sh  | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/netdevsim/tc-mq-visibility.sh b/tools/testing/selftests/drivers/net/netdevsim/tc-mq-visibility.sh
index fd13c8cfb7a8..b411fe66510f 100755
--- a/tools/testing/selftests/drivers/net/netdevsim/tc-mq-visibility.sh
+++ b/tools/testing/selftests/drivers/net/netdevsim/tc-mq-visibility.sh
@@ -58,9 +58,12 @@ for root in mq mqprio; do
     ethtool -L $NDEV combined 4
     n_child_assert 4 "One real queue, rest default"
 
-    # Graft some
-    tcq replace parent 100:1 handle 204:
-    n_child_assert 3 "Grafted"
+    # Remove real one
+    tcq del parent 100:4 handle 204:
+
+    # Replace default with pfifo
+    tcq replace parent 100:1 handle 205: pfifo limit 1000
+    n_child_assert 3 "Deleting real one, replacing default one with pfifo"
 
     ethtool -L $NDEV combined 1
     n_child_assert 1 "Grafted, one"
-- 
2.55.0