[PATCH 7/9] qtest/e1000e|igb: Test interrupt throttling in multiple_transfers test

[Nicholas Piggin <npiggin@gmail.com>]

Enable interrupt throtling on one of the two queue interrupts used
in the multiple_transfers test, to improve coverage.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 tests/qtest/e1000e-test.c | 4 ++--
 tests/qtest/igb-test.c    | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tests/qtest/e1000e-test.c b/tests/qtest/e1000e-test.c
index 9ab81ecff5b..5e391095f32 100644
--- a/tests/qtest/e1000e-test.c
+++ b/tests/qtest/e1000e-test.c
@@ -194,8 +194,8 @@ static void test_e1000e_multiple_transfers(void *obj, void *data,
         return;
     }
 
-    /* Clear EITR because buggy QEMU throttle timer causes superfluous irqs */
-    e1000e_macreg_write(d, E1000_EITR + E1000E_RX0_MSG_ID * 4, 0);
+    /* Use EITR for one irq and disable it for the other, for testing */
+    e1000e_macreg_write(d, E1000_EITR + E1000E_RX0_MSG_ID * 4, 500);
     e1000e_macreg_write(d, E1000_EITR + E1000E_TX0_MSG_ID * 4, 0);
 
     for (i = 0; i < iterations; i++) {
diff --git a/tests/qtest/igb-test.c b/tests/qtest/igb-test.c
index 1bbb4bea4c1..0a9c5162019 100644
--- a/tests/qtest/igb-test.c
+++ b/tests/qtest/igb-test.c
@@ -198,6 +198,10 @@ static void test_igb_multiple_transfers(void *obj, void *data,
         return;
     }
 
+    /* Use EITR for one irq and disable it for the other, for testing */
+    e1000e_macreg_write(d, E1000_EITR(E1000E_RX0_MSG_ID), 0);
+    e1000e_macreg_write(d, E1000_EITR(E1000E_TX0_MSG_ID), 125 << 2);
+
     for (i = 0; i < iterations; i++) {
         igb_send_verify(d, data, alloc);
         igb_receive_verify(d, data, alloc);
-- 
2.45.2