[PATCH bpf-next v3 13/14] selftests/bpf: test_xsk: Isolate flaky tests

["Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@xxxxxxxxxxx>]

Some tests are flaky and fail from time to time on virtual interfaces.
Adding them to the CI would trigger lots of 'false' errors.

Remove the flaky tests from the nominal tests table so they won't be
run by the CI in upcoming patch.
Create a flaky_tests table to hold them.
Use this flaky table in xskxceiver.c to keep all the tests available
from the test_xsk.sh script.

Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@xxxxxxxxxxx>
---
 tools/testing/selftests/bpf/test_xsk.h   |  8 ++++++--
 tools/testing/selftests/bpf/xskxceiver.c | 15 +++++++++++----
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_xsk.h b/tools/testing/selftests/bpf/test_xsk.h
index b068b25ea5da728fad1e17b894d6a1b1c9794f74..b86694d0eef53521e2f245670bbc8176991466bd 100644
--- a/tools/testing/selftests/bpf/test_xsk.h
+++ b/tools/testing/selftests/bpf/test_xsk.h
@@ -272,7 +272,6 @@ static const struct test_spec tests[] = {
 	{.name = "XDP_SHARED_UMEM", .test_func = testapp_xdp_shared_umem},
 	{.name = "XDP_METADATA_COPY", .test_func = testapp_xdp_metadata},
 	{.name = "XDP_METADATA_COPY_MULTI_BUFF", .test_func = testapp_xdp_metadata_mb},
-	{.name = "SEND_RECEIVE_9K_PACKETS", .test_func = testapp_send_receive_mb},
 	{.name = "SEND_RECEIVE_UNALIGNED_9K_PACKETS",
 	 .test_func = testapp_send_receive_unaligned_mb},
 	{.name = "ALIGNED_INV_DESC_MULTI_BUFF", .test_func = testapp_aligned_inv_desc_mb},
@@ -282,9 +281,14 @@ static const struct test_spec tests[] = {
 	{.name = "HW_SW_MAX_RING_SIZE", .test_func = testapp_hw_sw_max_ring_size},
 	{.name = "XDP_ADJUST_TAIL_SHRINK", .test_func = testapp_adjust_tail_shrink},
 	{.name = "XDP_ADJUST_TAIL_SHRINK_MULTI_BUFF", .test_func = testapp_adjust_tail_shrink_mb},
-	{.name = "XDP_ADJUST_TAIL_GROW", .test_func = testapp_adjust_tail_grow},
 	{.name = "XDP_ADJUST_TAIL_GROW_MULTI_BUFF", .test_func = testapp_adjust_tail_grow_mb},
 	{.name = "TX_QUEUE_CONSUMER", .test_func = testapp_tx_queue_consumer},
 	};
 
+static const struct test_spec flaky_tests[] = {
+	{.name = "XDP_ADJUST_TAIL_GROW", .test_func = testapp_adjust_tail_grow},
+	{.name = "SEND_RECEIVE_9K_PACKETS", .test_func = testapp_send_receive_mb},
+};
+
+
 #endif				/* TEST_XSK_H_ */
diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index 68aa3317dfc62cd4deac07f2d58fefd55770775f..0d8e240864c747253d72319efeecd46f0fdeff03 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -311,10 +311,13 @@ static void print_tests(void)
 	printf("Tests:\n");
 	for (i = 0; i < ARRAY_SIZE(tests); i++)
 		printf("%u: %s\n", i, tests[i].name);
+	for (i = ARRAY_SIZE(tests); i < ARRAY_SIZE(tests) + ARRAY_SIZE(flaky_tests); i++)
+		printf("%u: %s\n", i, flaky_tests[i - ARRAY_SIZE(tests)].name);
 }
 
 int main(int argc, char **argv)
 {
+	const size_t total_tests = ARRAY_SIZE(tests) + ARRAY_SIZE(flaky_tests);
 	struct pkt_stream *rx_pkt_stream_default;
 	struct pkt_stream *tx_pkt_stream_default;
 	struct ifobject *ifobj_tx, *ifobj_rx;
@@ -342,7 +345,7 @@ int main(int argc, char **argv)
 		print_tests();
 		ksft_exit_xpass();
 	}
-	if (opt_run_test != RUN_ALL_TESTS && opt_run_test >= ARRAY_SIZE(tests)) {
+	if (opt_run_test != RUN_ALL_TESTS && opt_run_test >= total_tests) {
 		ksft_print_msg("Error: test %u does not exist.\n", opt_run_test);
 		ksft_exit_xfail();
 	}
@@ -382,7 +385,7 @@ int main(int argc, char **argv)
 	test.rx_pkt_stream_default = rx_pkt_stream_default;
 
 	if (opt_run_test == RUN_ALL_TESTS)
-		nb_tests = ARRAY_SIZE(tests);
+		nb_tests = total_tests;
 	else
 		nb_tests = 1;
 	if (opt_mode == TEST_MODE_ALL) {
@@ -404,11 +407,15 @@ int main(int argc, char **argv)
 		if (opt_mode != TEST_MODE_ALL && i != opt_mode)
 			continue;
 
-		for (j = 0; j < ARRAY_SIZE(tests); j++) {
+		for (j = 0; j < total_tests; j++) {
 			if (opt_run_test != RUN_ALL_TESTS && j != opt_run_test)
 				continue;
 
-			test_init(&test, ifobj_tx, ifobj_rx, i, &tests[j]);
+			if (j < ARRAY_SIZE(tests))
+				test_init(&test, ifobj_tx, ifobj_rx, i, &tests[j]);
+			else
+				test_init(&test, ifobj_tx, ifobj_rx, i,
+					  &flaky_tests[j - ARRAY_SIZE(tests)]);
 			run_pkt_test(&test);
 			usleep(USLEEP_MAX);
 

-- 
2.50.1