[Devel] [PATCH vz10 v2] selftests: netdevsim: skip the rate tc-bw check without tool support

[Konstantin Khorenko <khorenko@virtuozzo.com>]

From: Eva Kurchatova <eva.kurchatova@virtuozzo.com>

The tc-bw attribute was added to devlink in iproute2 6.17, together
with the kernel side in v6.17.  An older devlink has no such option and
the rate test fails on "Unknown option" instead of skipping.

Probe once in rate_test() and skip the tc-bw checks as a whole, so that
a missing option costs a single skip line rather than one per rate
object.

https://virtuozzo.atlassian.net/browse/VSTOR-139651
Feature: fix selftests
Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
---
Changes in v2:
- probe once in rate_test() and guard both tc-bw blocks, instead of
  probing inside rate_attr_tc_bw_check().  v1 ran the probe on every
  call, so a devlink without tc-bw produced five identical skip lines,
  one per rate object, and five devlink invocations.
- say what is actually missing in the skip message, in the form the
  bonding tests already use.
- commit message: name the iproute2 release that added the option
  instead of the distribution that ships an older one.

 .../drivers/net/netdevsim/devlink.sh          | 29 +++++++++++++------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
index 030762b203d7..fd17fb0ec020 100755
--- a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
+++ b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
@@ -668,6 +668,13 @@ rate_test()
 {
 	RET=0
 
+	local tc_bw_supported=false
+	if devlink port function rate help 2>&1 | grep -q tc-bw; then
+		tc_bw_supported=true
+	else
+		log_test_skip "rate tc-bw" "Current iproute doesn't support rate option 'tc-bw'."
+	fi
+
 	echo $VF_COUNT > /sys/bus/netdevsim/devices/$DEV_NAME/sriov_numvfs
 	devlink dev eswitch set $DL_HANDLE mode switchdev
 	local leafs=`rate_leafs_get $DL_HANDLE`
@@ -691,12 +698,14 @@ rate_test()
 		rate=$(($rate+100))
 	done
 
-	local tc_bw="0:0 1:40 2:0 3:0 4:0 5:0 6:60 7:0"
-	for r_obj in $leafs
-	do
-		rate_attr_tc_bw_check "$r_obj" "$tc_bw" \
-			"$DEBUGFS_DIR"/ports/"${r_obj##*/}"
-	done
+	if $tc_bw_supported; then
+		local tc_bw="0:0 1:40 2:0 3:0 4:0 5:0 6:60 7:0"
+		for r_obj in $leafs
+		do
+			rate_attr_tc_bw_check "$r_obj" "$tc_bw" \
+				"$DEBUGFS_DIR"/ports/"${r_obj##*/}"
+		done
+	fi
 
 	local node1_name='group1'
 	local node1="$DL_HANDLE/$node1_name"
@@ -716,9 +725,11 @@ rate_test()
 		$DEBUGFS_DIR/rate_nodes/${node1##*/}/tx_max
 
 
-	local tc_bw="0:20 1:0 2:0 3:0 4:0 5:20 6:60 7:0"
-	rate_attr_tc_bw_check $node1 "$tc_bw" \
-		"$DEBUGFS_DIR"/rate_nodes/"${node1##*/}"
+	if $tc_bw_supported; then
+		local tc_bw="0:20 1:0 2:0 3:0 4:0 5:20 6:60 7:0"
+		rate_attr_tc_bw_check $node1 "$tc_bw" \
+			"$DEBUGFS_DIR"/rate_nodes/"${node1##*/}"
+	fi
 
 
 	rate_node_del "$node1"
-- 
2.47.1