selftests: mlxsw: tc_restrictions: Test tc-police restrictions

Test that upper and lower limits on rate and burst size imposed by the
device are rejected by the kernel.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -11,6 +11,8 @@ ALL_TESTS="
 	matchall_mirror_behind_flower_ingress_test
 	matchall_sample_behind_flower_ingress_test
 	matchall_mirror_behind_flower_egress_test
+	police_limits_test
+	multi_police_test
 "
 NUM_NETIFS=2
 
@@ -287,6 +289,80 @@ matchall_mirror_behind_flower_egress_test()
 	matchall_behind_flower_egress_test "mirror" "mirred egress mirror dev $swp2"
 }
 
+police_limits_test()
+{
+	RET=0
+
+	tc qdisc add dev $swp1 clsact
+
+	tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
+		flower skip_sw \
+		action police rate 0.5kbit burst 1m conform-exceed drop/ok
+	check_fail $? "Incorrect success to add police action with too low rate"
+
+	tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
+		flower skip_sw \
+		action police rate 2.5tbit burst 1g conform-exceed drop/ok
+	check_fail $? "Incorrect success to add police action with too high rate"
+
+	tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
+		flower skip_sw \
+		action police rate 1.5kbit burst 1m conform-exceed drop/ok
+	check_err $? "Failed to add police action with low rate"
+
+	tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower
+
+	tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
+		flower skip_sw \
+		action police rate 1.9tbit burst 1g conform-exceed drop/ok
+	check_err $? "Failed to add police action with high rate"
+
+	tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower
+
+	tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
+		flower skip_sw \
+		action police rate 1.5kbit burst 512b conform-exceed drop/ok
+	check_fail $? "Incorrect success to add police action with too low burst size"
+
+	tc filter add dev $swp1 ingress pref 1 proto ip handle 101 \
+		flower skip_sw \
+		action police rate 1.5kbit burst 2k conform-exceed drop/ok
+	check_err $? "Failed to add police action with low burst size"
+
+	tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower
+
+	tc qdisc del dev $swp1 clsact
+
+	log_test "police rate and burst limits"
+}
+
+multi_police_test()
+{
+	RET=0
+
+	# It is forbidden in mlxsw driver to have multiple police
+	# actions in a single rule.
+
+	tc qdisc add dev $swp1 clsact
+
+	tc filter add dev $swp1 ingress protocol ip pref 1 handle 101 \
+		flower skip_sw \
+		action police rate 100mbit burst 100k conform-exceed drop/ok
+	check_err $? "Failed to add rule with single police action"
+
+	tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower
+
+	tc filter add dev $swp1 ingress protocol ip pref 1 handle 101 \
+		flower skip_sw \
+		action police rate 100mbit burst 100k conform-exceed drop/pipe \
+		action police rate 200mbit burst 200k conform-exceed drop/ok
+	check_fail $? "Incorrect success to add rule with two police actions"
+
+	tc qdisc del dev $swp1 clsact
+
+	log_test "multi police"
+}
+
 setup_prepare()
 {
 	swp1=${NETIFS[p1]}