[PATCH bpf-next 6/6] selftests/xsk: enhance framework with a new test case for AF_XDP under max ring sizes

[Tushar Vyavahare <tushar.vyavahare@xxxxxxxxx>]

Introduce a test case to evaluate AF_XDP's robustness by pushing hardware
and software ring sizes to their limits. This test ensures AF_XDP's
reliability amidst potential producer/consumer throttling due to maximum
ring utilization. The testing strategy includes:

1. Configuring rings to their maximum allowable sizes.
2. Executing a series of tests across diverse batch sizes to assess system
   performance under varying load conditions.

Signed-off-by: Tushar Vyavahare <tushar.vyavahare@xxxxxxxxx>
---
 tools/testing/selftests/bpf/xskxceiver.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index 5326ca5c458c..f545b529e404 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -2480,6 +2480,26 @@ static int testapp_hw_sw_min_ring_size(struct test_spec *test)
 	return testapp_validate_traffic(test);
 }
 
+static int testapp_hw_sw_max_ring_size(struct test_spec *test)
+{
+	u32 max_descs = XSK_RING_PROD__DEFAULT_NUM_DESCS * 2;
+	int ret;
+
+	test->total_steps = 2;
+	test->ifobj_tx->ring.set_tx = test->ifobj_tx->ring.max_tx;
+	test->ifobj_tx->ring.set_rx = test->ifobj_tx->ring.max_rx;
+	test->ifobj_rx->umem->num_frames = max_descs;
+	test->ifobj_rx->xsk->rxqsize = max_descs;
+	test->ifobj_rx->xsk->batch_size = XSK_RING_PROD__DEFAULT_NUM_DESCS;
+	ret = testapp_validate_traffic(test);
+	if (ret)
+		return ret;
+
+	/* Set batch_size to 4095 */
+	test->ifobj_rx->xsk->batch_size = max_descs - 1;
+	return testapp_validate_traffic(test);
+}
+
 static void run_pkt_test(struct test_spec *test)
 {
 	int ret;
@@ -2585,6 +2605,7 @@ static const struct test_spec tests[] = {
 	{.name = "UNALIGNED_INV_DESC_MULTI_BUFF", .test_func = testapp_unaligned_inv_desc_mb},
 	{.name = "TOO_MANY_FRAGS", .test_func = testapp_too_many_frags},
 	{.name = "HW_SW_MIN_RING_SIZE", .test_func = testapp_hw_sw_min_ring_size},
+	{.name = "HW_SW_MAX_RING_SIZE", .test_func = testapp_hw_sw_max_ring_size},
 };
 
 static void print_tests(void)
-- 
2.34.1