[dts][PATCH V1] tests/mtu_update:igc can receive packets 8 larger than MTU

[Lewei Yang]

According to dpdk commit 1bb4a528c41f("ethdev: fix max Rx packet length"),
there is a miss accuracy in the MTU configuration in DPDK, packets bigger (up to 8 bytes) than requested MTU can be received.

Signed-off-by: Lewei Yang <leweix.yang at intel.com>
---
 tests/TestSuite_mtu_update.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tests/TestSuite_mtu_update.py b/tests/TestSuite_mtu_update.py
index ad13a8ab..be114759 100644
--- a/tests/TestSuite_mtu_update.py
+++ b/tests/TestSuite_mtu_update.py
@@ -239,9 +239,9 @@ class TestMtuUpdate(TestCase):
         On 1G NICs, when the jubmo frame MTU set > 1500, the software adjust it to MTU+4.
         """
         if self.nic in ["powerville", "springville", "foxville"] and packet_size > 1500:
-            self.send_packet_of_size_to_tx_port(packet_size + 4 - 1, received=True)
-            self.send_packet_of_size_to_tx_port(packet_size + 4, received=True)
-            self.send_packet_of_size_to_tx_port(packet_size + 4 + 1, received=False)
+            self.send_packet_of_size_to_tx_port(packet_size + 8 - 1, received=True)
+            self.send_packet_of_size_to_tx_port(packet_size + 8, received=True)
+            self.send_packet_of_size_to_tx_port(packet_size + 8 + 1, received=False)
         else:
             self.send_packet_of_size_to_tx_port(packet_size - 1, received=True)
             self.send_packet_of_size_to_tx_port(packet_size, received=True)
-- 
2.33.1