1 files changed, 84 insertions, 0 deletions
diff --git a/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh b/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh
new file mode 100644
index 000000000..faa51012c
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: GPL-2.0
+
+check_rate()
+{
+	local rate=$1; shift
+	local min=$1; shift
+	local what=$1; shift
+
+	if ((rate > min)); then
+		return 0
+	fi
+
+	echo "$what $(humanize $ir) < $(humanize $min)" > /dev/stderr
+	return 1
+}
+
+measure_rate()
+{
+	local sw_in=$1; shift   # Where the traffic ingresses the switch
+	local host_in=$1; shift # Where it ingresses another host
+	local counter=$1; shift # Counter to use for measurement
+	local what=$1; shift
+
+	local interval=10
+	local i
+	local ret=0
+
+	# Dips in performance might cause momentary ingress rate to drop below
+	# 1Gbps. That wouldn't saturate egress and MC would thus get through,
+	# seemingly winning bandwidth on account of UC. Demand at least 2Gbps
+	# average ingress rate to somewhat mitigate this.
+	local min_ingress=2147483648
+
+	for i in {5..0}; do
+		local t0=$(ethtool_stats_get $host_in $counter)
+		local u0=$(ethtool_stats_get $sw_in $counter)
+		sleep $interval
+		local t1=$(ethtool_stats_get $host_in $counter)
+		local u1=$(ethtool_stats_get $sw_in $counter)
+
+		local ir=$(rate $u0 $u1 $interval)
+		local er=$(rate $t0 $t1 $interval)
+
+		if check_rate $ir $min_ingress "$what ingress rate"; then
+			break
+		fi
+
+		# Fail the test if we can't get the throughput.
+		if ((i == 0)); then
+			ret=1
+		fi
+	done
+
+	echo $ir $er
+	return $ret
+}
+
+bail_on_lldpad()
+{
+	if systemctl is-active --quiet lldpad; then
+
+		cat >/dev/stderr <<-EOF
+		WARNING: lldpad is running
+
+			lldpad will likely configure DCB, and this test will
+			configure Qdiscs. mlxsw does not support both at the
+			same time, one of them is arbitrarily going to overwrite
+			the other. That will cause spurious failures (or,
+			unlikely, passes) of this test.
+		EOF
+
+		if [[ -z $ALLOW_LLDPAD ]]; then
+			cat >/dev/stderr <<-EOF
+
+				If you want to run the test anyway, please set
+				an environment variable ALLOW_LLDPAD to a
+				non-empty string.
+			EOF
+			exit 1
+		else
+			return
+		fi
+	fi
+}