selftests: mlxsw: resource_scale: Introduce traffic tests

The scale tests are currently testing two things: that some number of
instances of a given resource can actually be created; and that when an
attempt is made to create more than the supported amount, the failures are
noted and handled gracefully.

However the ability to allocate the resource does not mean that the
resource actually works when passing traffic. For that, make it possible
for a given scale to also test traffic.

Traffic test is only run on the positive leg of the scale test (no point
trying to pass traffic when the expected outcome is that the resource will
not be allocated). Traffic tests are opt-in, if a given test does not
expose it, it is not run.

To this end, delay the test cleanup until after the traffic test is run.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -42,13 +42,21 @@ for current_test in ${TESTS:-$ALL_TESTS}; do
 		# following the test setup.
 		target=$(${current_test}_get_target "$should_fail")
 		${current_test}_test "$target" "$should_fail"
-		${current_test}_cleanup
-		devlink_reload
 		if [[ "$should_fail" -eq 0 ]]; then
 			log_test "'$current_test' $target"
+
+			if ((!RET)); then
+				tt=${current_test}_traffic_test
+				if [[ $(type -t $tt) == "function" ]]; then
+					$tt "$target"
+					log_test "'$current_test' $target traffic test"
+				fi
+			fi
 		else
 			log_test "'$current_test' overflow $target"
 		fi
+		${current_test}_cleanup
+		devlink_reload
 		RET_FIN=$(( RET_FIN || RET ))
 	done
 done

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

@@ -47,12 +47,21 @@ for current_test in ${TESTS:-$ALL_TESTS}; do
 			# changed following the test setup.
 			target=$(${current_test}_get_target "$should_fail")
 			${current_test}_test "$target" "$should_fail"
-			${current_test}_cleanup
 			if [[ "$should_fail" -eq 0 ]]; then
 				log_test "'$current_test' [$profile] $target"
+
+				if ((!RET)); then
+					tt=${current_test}_traffic_test
+					if [[ $(type -t $tt) == "function" ]]
+					then
+						$tt "$target"
+						log_test "'$current_test' [$profile] $target traffic test"
+					fi
+				fi
 			else
 				log_test "'$current_test' [$profile] overflow $target"
 			fi
+			${current_test}_cleanup
 			RET_FIN=$(( RET_FIN || RET ))
 		done
 	done