[PATCH v6 3/4] app/test: add unit tests for lcore poll busyness

[Kevin Laatz <kevin.laatz@intel.com>]

Add API unit tests and perf unit tests for the newly added lcore poll
busyness feature.

Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
---
 app/test/meson.build                     |   4 +
 app/test/test_lcore_poll_busyness_api.c  | 134 +++++++++++++++++++++++
 app/test/test_lcore_poll_busyness_perf.c |  72 ++++++++++++
 3 files changed, 210 insertions(+)
 create mode 100644 app/test/test_lcore_poll_busyness_api.c
 create mode 100644 app/test/test_lcore_poll_busyness_perf.c

diff --git a/app/test/meson.build b/app/test/meson.build
index 431c5bd318..4a56ca7b5a 100644
--- a/app/test/meson.build
+++ b/app/test/meson.build
@@ -74,6 +74,8 @@ test_sources = files(
         'test_ipsec_perf.c',
         'test_kni.c',
         'test_kvargs.c',
+        'test_lcore_poll_busyness_api.c',
+        'test_lcore_poll_busyness_perf.c',
         'test_lcores.c',
         'test_logs.c',
         'test_lpm.c',
@@ -192,6 +194,7 @@ fast_tests = [
         ['interrupt_autotest', true, true],
         ['ipfrag_autotest', false, true],
         ['lcores_autotest', true, true],
+        ['lcore_poll_busyness_autotest', true, true],
         ['logs_autotest', true, true],
         ['lpm_autotest', true, true],
         ['lpm6_autotest', true, true],
@@ -292,6 +295,7 @@ perf_test_names = [
         'trace_perf_autotest',
         'ipsec_perf_autotest',
         'thash_perf_autotest',
+        'lcore_poll_busyness_perf_autotest'
 ]
 
 driver_test_names = [
diff --git a/app/test/test_lcore_poll_busyness_api.c b/app/test/test_lcore_poll_busyness_api.c
new file mode 100644
index 0000000000..db76322994
--- /dev/null
+++ b/app/test/test_lcore_poll_busyness_api.c
@@ -0,0 +1,134 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Intel Corporation
+ */
+
+#include <rte_lcore.h>
+
+#include "test.h"
+
+/* Arbitrary amount of "work" to simulate busyness with */
+#define WORK		32
+#define TIMESTAMP_ITERS	1000000
+
+#define LCORE_POLL_BUSYNESS_NOT_SET	-1
+
+static int
+test_lcore_poll_busyness_enable_disable(void)
+{
+	int initial_state, curr_state;
+	bool req_state;
+
+	/* Get the initial state */
+	initial_state = rte_lcore_poll_busyness_enabled();
+	if (initial_state == -ENOTSUP)
+		return TEST_SKIPPED;
+
+	/* Set state to the inverse of the initial state and check for the change */
+	req_state = !initial_state;
+	rte_lcore_poll_busyness_enabled_set(req_state);
+	curr_state = rte_lcore_poll_busyness_enabled();
+	if (curr_state != req_state)
+		return TEST_FAILED;
+
+	/* Now change the state back to the original state. By changing it back, both
+	 * enable and disable will have been tested.
+	 */
+	req_state = !curr_state;
+	rte_lcore_poll_busyness_enabled_set(req_state);
+	curr_state = rte_lcore_poll_busyness_enabled();
+	if (curr_state != req_state)
+		return TEST_FAILED;
+
+	return TEST_SUCCESS;
+}
+
+static int
+test_lcore_poll_busyness_invalid_lcore(void)
+{
+	int ret;
+
+	/* Check if lcore poll busyness is enabled */
+	if (rte_lcore_poll_busyness_enabled() == -ENOTSUP)
+		return TEST_SKIPPED;
+
+	/* Only lcore_id <= RTE_MAX_LCORE are valid */
+	ret = rte_lcore_poll_busyness(RTE_MAX_LCORE);
+	if (ret != -EINVAL)
+		return TEST_FAILED;
+
+	return TEST_SUCCESS;
+}
+
+static int
+test_lcore_poll_busyness_inactive_lcore(void)
+{
+	int ret;
+
+	/* Check if lcore poll busyness is enabled */
+	if (rte_lcore_poll_busyness_enabled() == -ENOTSUP)
+		return TEST_SKIPPED;
+
+	/* Use the test thread lcore_id for this test. Since it is not a polling
+	 * application, the busyness is expected to return -1.
+	 *
+	 * Note: this will not work with affinitized cores
+	 */
+	ret = rte_lcore_poll_busyness(rte_lcore_id());
+	if (ret != LCORE_POLL_BUSYNESS_NOT_SET)
+		return TEST_FAILED;
+
+	return TEST_SUCCESS;
+}
+
+static void
+simulate_lcore_poll_busyness(int iters)
+{
+	int i;
+
+	for (i = 0; i < iters; i++)
+		RTE_LCORE_POLL_BUSYNESS_TIMESTAMP(WORK);
+}
+
+/* The test cannot know of an application running to test for valid lcore poll
+ * busyness data. For this test, we simulate lcore poll busyness for the
+ * lcore_id of the test thread for testing purposes.
+ */
+static int
+test_lcore_poll_busyness_active_lcore(void)
+{
+	int ret;
+
+	/* Check if lcore poll busyness is enabled */
+	if (rte_lcore_poll_busyness_enabled() == -ENOTSUP)
+		return TEST_SKIPPED;
+
+	simulate_lcore_poll_busyness(TIMESTAMP_ITERS);
+
+	/* After timestamping with "work" many times, lcore poll busyness should be > 0 */
+	ret = rte_lcore_poll_busyness(rte_lcore_id());
+	if (ret <= 0)
+		return TEST_FAILED;
+
+	return TEST_SUCCESS;
+}
+
+static struct unit_test_suite lcore_poll_busyness_tests = {
+	.suite_name = "lcore poll busyness autotest",
+	.setup = NULL,
+	.teardown = NULL,
+	.unit_test_cases = {
+		TEST_CASE(test_lcore_poll_busyness_enable_disable),
+		TEST_CASE(test_lcore_poll_busyness_invalid_lcore),
+		TEST_CASE(test_lcore_poll_busyness_inactive_lcore),
+		TEST_CASE(test_lcore_poll_busyness_active_lcore),
+		TEST_CASES_END()
+	}
+};
+
+static int
+test_lcore_poll_busyness_api(void)
+{
+	return unit_test_suite_runner(&lcore_poll_busyness_tests);
+}
+
+REGISTER_TEST_COMMAND(lcore_poll_busyness_autotest, test_lcore_poll_busyness_api);
diff --git a/app/test/test_lcore_poll_busyness_perf.c b/app/test/test_lcore_poll_busyness_perf.c
new file mode 100644
index 0000000000..5c27d21b00
--- /dev/null
+++ b/app/test/test_lcore_poll_busyness_perf.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Intel Corporation
+ */
+
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <rte_lcore.h>
+#include <rte_cycles.h>
+
+#include "test.h"
+
+/* Arbitrary amount of "work" to simulate busyness with */
+#define WORK		32
+#define TIMESTAMP_ITERS	1000000
+#define TEST_ITERS	10000
+
+static void
+simulate_lcore_poll_busyness(int iters)
+{
+	int i;
+
+	for (i = 0; i < iters; i++)
+		RTE_LCORE_POLL_BUSYNESS_TIMESTAMP(WORK);
+}
+
+static void
+test_timestamp_perf(void)
+{
+	uint64_t start, end, diff;
+	uint64_t min = UINT64_MAX;
+	uint64_t max = 0;
+	uint64_t total = 0;
+	int i;
+
+	for (i = 0; i < TEST_ITERS; i++) {
+		start = rte_rdtsc();
+		RTE_LCORE_POLL_BUSYNESS_TIMESTAMP(WORK);
+		end = rte_rdtsc();
+
+		diff = end - start;
+		min = RTE_MIN(diff, min);
+		max = RTE_MAX(diff, max);
+		total += diff;
+	}
+
+	printf("### Timestamp perf ###\n");
+	printf("Min cycles: %"PRIu64"\n", min);
+	printf("Avg cycles: %"PRIu64"\n", total / TEST_ITERS);
+	printf("Max cycles: %"PRIu64"\n", max);
+	printf("\n");
+}
+
+
+static int
+test_lcore_poll_busyness_perf(void)
+{
+	if (rte_lcore_poll_busyness_enabled()  == -ENOTSUP) {
+		printf("Lcore poll busyness may be disabled...\n");
+		return TEST_SKIPPED;
+	}
+
+	/* Initialize and prime the timestamp struct with simulated "work" for this lcore */
+	simulate_lcore_poll_busyness(10000);
+
+	/* Run perf tests */
+	test_timestamp_perf();
+
+	return TEST_SUCCESS;
+}
+
+REGISTER_TEST_COMMAND(lcore_poll_busyness_perf_autotest, test_lcore_poll_busyness_perf);
-- 
2.31.1