[PATCH bpf-next v2 18/20] selftests: xsk: eliminate test specific if-statement in test runner

[Magnus Karlsson <magnus.karlsson@gmail.com>]

From: Magnus Karlsson <magnus.karlsson@intel.com>

Eliminate a test specific if-statement for the RX_FILL_EMTPY stats
test that is present in the test runner. We can do this as we now have
the use_addr_for_fill option. Just create and empty Rx packet stream
and indicated that the test runner should use the addresses in that to
populate the fill ring. As there are no packets in the stream, the
fill ring will be empty and we will get the error stats that we want
to test.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
---
 tools/testing/selftests/bpf/xdpxceiver.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
index 7cc75d1481e2..4d86c4b62aa9 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.c
+++ b/tools/testing/selftests/bpf/xdpxceiver.c
@@ -458,8 +458,10 @@ static void pkt_stream_delete(struct pkt_stream *pkt_stream)
 
 static void pkt_stream_restore_default(struct test_spec *test)
 {
-	pkt_stream_delete(test->ifobj_tx->pkt_stream);
-	test->ifobj_tx->pkt_stream = test->pkt_stream_default;
+	if (test->ifobj_tx->pkt_stream != test->pkt_stream_default) {
+		pkt_stream_delete(test->ifobj_tx->pkt_stream);
+		test->ifobj_tx->pkt_stream = test->pkt_stream_default;
+	}
 	test->ifobj_rx->pkt_stream = test->pkt_stream_default;
 }
 
@@ -931,8 +933,7 @@ static void *worker_testapp_validate_rx(void *arg)
 	if (test->current_step == 1)
 		thread_common_ops(test, ifobject);
 
-	if (stat_test_type != STAT_TEST_RX_FILL_EMPTY)
-		xsk_populate_fill_ring(ifobject->umem, ifobject->pkt_stream);
+	xsk_populate_fill_ring(ifobject->umem, ifobject->pkt_stream);
 
 	fds.fd = xsk_socket__fd(ifobject->xsk->xsk);
 	fds.events = POLLIN;
@@ -1065,7 +1066,14 @@ static void testapp_stats(struct test_spec *test)
 			break;
 		case STAT_TEST_RX_FILL_EMPTY:
 			test_spec_set_name(test, "STAT_RX_FILL_EMPTY");
+			test->ifobj_rx->pkt_stream = pkt_stream_generate(test->ifobj_rx->umem, 0,
+									 MIN_PKT_SIZE);
+			if (!test->ifobj_rx->pkt_stream)
+				exit_with_error(ENOMEM);
+			test->ifobj_rx->pkt_stream->use_addr_for_fill = true;
 			testapp_validate_traffic(test);
+
+			pkt_stream_restore_default(test);
 			break;
 		default:
 			break;
-- 
2.29.0