selftests: mlxsw: Add qos_lib.sh

Extract reusable code from qos_mc_aware.sh and put into a new library.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh

+# SPDX-License-Identifier: GPL-2.0
+
+humanize()
+{
+	local speed=$1; shift
+
+	for unit in bps Kbps Mbps Gbps; do
+		if (($(echo "$speed < 1024" | bc))); then
+			break
+		fi
+
+		speed=$(echo "scale=1; $speed / 1024" | bc)
+	done
+
+	echo "$speed${unit}"
+}
+
+rate()
+{
+	local t0=$1; shift
+	local t1=$1; shift
+	local interval=$1; shift
+
+	echo $((8 * (t1 - t0) / interval))
+}
+
+start_traffic()
+{
+	local h_in=$1; shift    # Where the traffic egresses the host
+	local sip=$1; shift
+	local dip=$1; shift
+	local dmac=$1; shift
+
+	$MZ $h_in -p 8000 -A $sip -B $dip -c 0 \
+		-a own -b $dmac -t udp -q &
+	sleep 1
+}
+
+stop_traffic()
+{
+	# Suppress noise from killing mausezahn.
+	{ kill %% && wait %%; } 2>/dev/null
+}
+
+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
+}

tools/testing/selftests/drivers/net/mlxsw/qos_mc_aware.sh

@@ -68,6 +68,7 @@ lib_dir=$(dirname $0)/../../../net/forwarding
 NUM_NETIFS=6
 source $lib_dir/lib.sh
 source $lib_dir/devlink_lib.sh
+source qos_lib.sh
 
 h1_create()
 {
@@ -220,107 +221,28 @@ ping_ipv4()
 	ping_test $h2 192.0.2.130
 }
 
-humanize()
-{
-	local speed=$1; shift
-
-	for unit in bps Kbps Mbps Gbps; do
-		if (($(echo "$speed < 1024" | bc))); then
-			break
-		fi
-
-		speed=$(echo "scale=1; $speed / 1024" | bc)
-	done
-
-	echo "$speed${unit}"
-}
-
-rate()
-{
-	local t0=$1; shift
-	local t1=$1; shift
-	local interval=$1; shift
-
-	echo $((8 * (t1 - t0) / interval))
-}
-
-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_ingress)" > /dev/stderr
-	return 1
-}
-
-measure_uc_rate()
-{
-	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
-
-	$MZ $h2.111 -p 8000 -A 192.0.2.129 -B 192.0.2.130 -c 0 \
-		-a own -b $h3mac -t udp -q &
-	sleep 1
-
-	for i in {5..0}; do
-		local t0=$(ethtool_stats_get $h3 rx_octets_prio_1)
-		local u0=$(ethtool_stats_get $swp2 rx_octets_prio_1)
-		sleep $interval
-		local t1=$(ethtool_stats_get $h3 rx_octets_prio_1)
-		local u1=$(ethtool_stats_get $swp2 rx_octets_prio_1)
-
-		local ir=$(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
-
-	# Suppress noise from killing mausezahn.
-	{ kill %% && wait; } 2>/dev/null
-
-	echo $ir $er
-	exit $ret
-}
-
 test_mc_aware()
 {
 	RET=0
 
 	local -a uc_rate
-	uc_rate=($(measure_uc_rate "UC-only"))
+	start_traffic $h2.111 192.0.2.129 192.0.2.130 $h3mac
+	uc_rate=($(measure_rate $swp2 $h3 rx_octets_prio_1 "UC-only"))
 	check_err $? "Could not get high enough UC-only ingress rate"
+	stop_traffic
 	local ucth1=${uc_rate[1]}
 
-	$MZ $h1 -p 8000 -c 0 -a own -b bc -t udp -q &
+	start_traffic $h1 own bc bc
 
 	local d0=$(date +%s)
 	local t0=$(ethtool_stats_get $h3 rx_octets_prio_0)
 	local u0=$(ethtool_stats_get $swp1 rx_octets_prio_0)
 
 	local -a uc_rate_2
-	uc_rate_2=($(measure_uc_rate "UC+MC"))
+	start_traffic $h2.111 192.0.2.129 192.0.2.130 $h3mac
+	uc_rate_2=($(measure_rate $swp2 $h3 rx_octets_prio_1 "UC+MC"))
 	check_err $? "Could not get high enough UC+MC ingress rate"
+	stop_traffic
 	local ucth2=${uc_rate_2[1]}
 
 	local d1=$(date +%s)
@@ -338,8 +260,7 @@ test_mc_aware()
 	local mc_ir=$(rate $u0 $u1 $interval)
 	local mc_er=$(rate $t0 $t1 $interval)
 
-	# Suppress noise from killing mausezahn.
-	{ kill %% && wait; } 2>/dev/null
+	stop_traffic
 
 	log_test "UC performace under MC overload"
 
@@ -363,8 +284,7 @@ test_uc_aware()
 {
 	RET=0
 
-	$MZ $h2.111 -p 8000 -A 192.0.2.129 -B 192.0.2.130 -c 0 \
-		-a own -b $h3mac -t udp -q &
+	start_traffic $h2.111 192.0.2.129 192.0.2.130 $h3mac
 
 	local d0=$(date +%s)
 	local t0=$(ethtool_stats_get $h3 rx_octets_prio_1)
@@ -394,8 +314,7 @@ test_uc_aware()
 	((attempts == passes))
 	check_err $?
 
-	# Suppress noise from killing mausezahn.
-	{ kill %% && wait; } 2>/dev/null
+	stop_traffic
 
 	log_test "MC performace under UC overload"
 	echo "    ingress UC throughput $(humanize ${uc_ir})"