selftests: forwarding: sch_ets: Add test coverage for ETS Qdisc

This tests the newly-added ETS Qdisc. It runs two to three streams of
traffic, each with a different priority. ETS Qdisc is supposed to allocate
bandwidth according to the DRR algorithm and given weights. After running
the traffic for a while, counters are compared for each stream to check
that the expected ratio is in fact observed.

In order for the DRR process to kick in, a traffic bottleneck must exist in
the first place. In slow path, such bottleneck can be implemented by
wrapping the ETS Qdisc inside a TBF or other shaper. This might however
make the configuration unoffloadable. Instead, on HW datapath, the
bottleneck would be set up by lowering port speed and configuring shared
buffer suitably.

Therefore the test is structured as a core component that implements the
testing, with two wrapper scripts that implement the details of slow path
resp. fast path configuration.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 95 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
index 75a3fb3b5663..a5937069ac16 100644
--- a/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh
@@ -78,3 +78,31 @@ measure_rate()
 	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 $ALLOW_LLDPAD ]]; then
+			cat >/dev/stderr <<-EOF
+
+				If you want to run the test anyway, please set
+				an environment variable ALLOW_LLDPAD to a
+				non-empty string.
+			EOF
+			exit 1
+		else
+			return
+		fi
+	fi
+}
diff --git a/tools/testing/selftests/drivers/net/mlxsw/sch_ets.sh b/tools/testing/selftests/drivers/net/mlxsw/sch_ets.sh
new file mode 100755
index 000000000000..c9fc4d4885c1
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/mlxsw/sch_ets.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# A driver for the ETS selftest that implements testing in offloaded datapath.
+lib_dir=$(dirname $0)/../../../net/forwarding
+source $lib_dir/sch_ets_core.sh
+source $lib_dir/devlink_lib.sh
+source qos_lib.sh
+
+ALL_TESTS="
+	ping_ipv4
+	priomap_mode
+	ets_test_strict
+	ets_test_mixed
+	ets_test_dwrr
+"
+
+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
+
+	# 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
+	# sure that there is always enough traffic of all types to select from
+	# for the DWRR process.
+	devlink_port_pool_th_set $swp1 0 12
+	devlink_tc_bind_pool_th_set $swp1 0 ingress 0 12
+	devlink_port_pool_th_set $swp2 4 12
+	devlink_tc_bind_pool_th_set $swp2 7 egress 4 5
+	devlink_tc_bind_pool_th_set $swp2 6 egress 4 5
+	devlink_tc_bind_pool_th_set $swp2 5 egress 4 5
+
+	# Note: sch_ets_core.sh uses VLAN ingress-qos-map to assign packet
+	# priorities at $swp1 based on their 802.1p headers. ingress-qos-map is
+	# not offloaded by mlxsw as of this writing, but the mapping used is
+	# 1:1, which is the mapping currently hard-coded by the driver.
+}
+
+switch_destroy()
+{
+	devlink_tc_bind_pool_th_restore $swp2 5 egress
+	devlink_tc_bind_pool_th_restore $swp2 6 egress
+	devlink_tc_bind_pool_th_restore $swp2 7 egress
+	devlink_port_pool_th_restore $swp2 4
+	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
+}
+
+# Callback from sch_ets_tests.sh
+get_stats()
+{
+	local band=$1; shift
+
+	ethtool_stats_get "$h2" rx_octets_prio_$band
+}
+
+bail_on_lldpad
+ets_run