selftests: mlxsw: Use shapers in QOS tests instead of forcing speed

QOS tests create congestion and verify the switch behavior. To create
congestion, they need to have more traffic than the port can handle, so
some of them force 1Gbps speed.

The tests assume that 1Gbps speed is supported, otherwise, they will fail.
Spectrum-4 ASIC will not support this speed in all ports, so to be able
to run QOS tests there, some adjustments are required. Use shapers to
limit the traffic instead of forcing speed. Note that for several ports,
the speed configuration is just for autoneg issues, so shaper is not needed
instead.

In tests that already use shapers, set the existing shaper to be a child of
a new TBF shaper which is added as a root qdisc and acts as a port shaper.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -130,7 +130,8 @@ switch_create()
 
 	ip link set dev $swp3 up
 	mtu_set $swp3 10000
-	ethtool -s $swp3 speed 1000 autoneg off
+	tc qdisc replace dev $swp3 root handle 101: tbf rate 1gbit \
+		burst 128K limit 1G
 
 	vlan_create $swp1 111
 	vlan_create $swp2 222
@@ -193,7 +194,7 @@ switch_destroy()
 	vlan_destroy $swp2 222
 	vlan_destroy $swp1 111
 
-	ethtool -s $swp3 autoneg on
+	tc qdisc del dev $swp3 root handle 101:
 	mtu_restore $swp3
 	ip link set dev $swp3 down
 	lldptool -T -i $swp3 -V ETS-CFG up2tc=0:0,1:0,2:0,3:0,4:0,5:0,6:0,7:0

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

@@ -129,9 +129,10 @@ switch_create()
 	vlan_create $swp2 111
 	vlan_create $swp3 111
 
-	ethtool -s $swp3 speed 1000 autoneg off
-	tc qdisc replace dev $swp3 root handle 3: \
-	   prio bands 8 priomap 7 7 7 7 7 7 7 7
+	tc qdisc replace dev $swp3 root handle 3: tbf rate 1gbit \
+		burst 128K limit 1G
+	tc qdisc replace dev $swp3 parent 3:3 handle 33: \
+		prio bands 8 priomap 7 7 7 7 7 7 7 7
 
 	ip link add name br1 type bridge vlan_filtering 0
 	ip link set dev br1 up
@@ -172,8 +173,8 @@ switch_destroy()
 	ip link del dev br111
 	ip link del dev br1
 
+	tc qdisc del dev $swp3 parent 3:3 handle 33:
 	tc qdisc del dev $swp3 root handle 3:
-	ethtool -s $swp3 autoneg on
 
 	vlan_destroy $swp3 111
 	vlan_destroy $swp2 111

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

@@ -15,13 +15,15 @@ ALL_TESTS="
 	ets_test_dwrr
 "
 
+PARENT="parent 3:3"
+
 switch_create()
 {
-	ets_switch_create
-
 	# Create a bottleneck so that the DWRR process can kick in.
-	ethtool -s $h2 speed 1000 autoneg off
-	ethtool -s $swp2 speed 1000 autoneg off
+	tc qdisc replace dev $swp2 root handle 3: tbf rate 1gbit \
+		burst 128K limit 1G
+
+	ets_switch_create
 
 	# Set the ingress quota high and use the three egress TCs to limit the
 	# amount of traffic that is admitted to the shared buffers. This makes
@@ -55,10 +57,9 @@ switch_destroy()
 	devlink_tc_bind_pool_th_restore $swp1 0 ingress
 	devlink_port_pool_th_restore $swp1 0
 
-	ethtool -s $swp2 autoneg on
-	ethtool -s $h2 autoneg on
-
 	ets_switch_destroy
+
+	tc qdisc del dev $swp2 root handle 3:
 }
 
 # Callback from sch_ets_tests.sh