selftests: mlxsw: Add scale test for port ranges

Query the maximum number of supported port range registers using
devlink-resource and test that this number can be reached by configuring
tc filters with different port ranges. Test that an error is returned in
case the maximum number is exceeded.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/48eee181270d9f291e09d1858c7b26a3f7fcc164.1689092769.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: GPL-2.0
+
+PORT_RANGE_NUM_NETIFS=2
+
+port_range_h1_create()
+{
+	simple_if_init $h1
+}
+
+port_range_h1_destroy()
+{
+	simple_if_fini $h1
+}
+
+port_range_switch_create()
+{
+	simple_if_init $swp1
+	tc qdisc add dev $swp1 clsact
+}
+
+port_range_switch_destroy()
+{
+	tc qdisc del dev $swp1 clsact
+	simple_if_fini $swp1
+}
+
+port_range_rules_create()
+{
+	local count=$1; shift
+	local should_fail=$1; shift
+	local batch_file="$(mktemp)"
+
+	for ((i = 0; i < count; ++i)); do
+		cat >> $batch_file <<-EOF
+			filter add dev $swp1 ingress \
+				prot ipv4 \
+				pref 1000 \
+				flower skip_sw \
+				ip_proto udp dst_port 1-$((100 + i)) \
+				action pass
+		EOF
+	done
+
+	tc -b $batch_file
+	check_err_fail $should_fail $? "Rule insertion"
+
+	rm -f $batch_file
+}
+
+__port_range_test()
+{
+	local count=$1; shift
+	local should_fail=$1; shift
+
+	port_range_rules_create $count $should_fail
+
+	offload_count=$(tc -j filter show dev $swp1 ingress |
+			jq "[.[] | select(.options.in_hw == true)] | length")
+	((offload_count == count))
+	check_err_fail $should_fail $? "port range offload count"
+}
+
+port_range_test()
+{
+	local count=$1; shift
+	local should_fail=$1; shift
+
+	if ! tc_offload_check $PORT_RANGE_NUM_NETIFS; then
+		check_err 1 "Could not test offloaded functionality"
+		return
+	fi
+
+	__port_range_test $count $should_fail
+}
+
+port_range_setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	vrf_prepare
+
+	port_range_h1_create
+	port_range_switch_create
+}
+
+port_range_cleanup()
+{
+	pre_cleanup
+
+	port_range_switch_destroy
+	port_range_h1_destroy
+
+	vrf_cleanup
+}

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/port_range_scale.sh

@@ -0,0 +1 @@
+../spectrum/port_range_scale.sh

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/resource_scale.sh

@@ -33,6 +33,7 @@ ALL_TESTS="
 	port
 	rif_mac_profile
 	rif_counter
+	port_range
 "
 
 for current_test in ${TESTS:-$ALL_TESTS}; do

tools/testing/selftests/drivers/net/mlxsw/spectrum/port_range_scale.sh

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+source ../port_range_scale.sh
+
+port_range_get_target()
+{
+	local should_fail=$1; shift
+	local target
+
+	target=$(devlink_resource_size_get port_range_registers)
+
+	if ((! should_fail)); then
+		echo $target
+	else
+		echo $((target + 1))
+	fi
+}

tools/testing/selftests/drivers/net/mlxsw/spectrum/resource_scale.sh

@@ -30,6 +30,7 @@ ALL_TESTS="
 	port
 	rif_mac_profile
 	rif_counter
+	port_range
 "
 
 for current_test in ${TESTS:-$ALL_TESTS}; do