[PATCH 24.11] dts: add reception check to checksum suite

[Dean Marx <dmarx@iol.unh.edu>]

[ upstream commit 89b634c9cf001570a7a1b1992ea6992c4181b8d7 ]

In the current implementation of Checksum Offload, the variables
is_L4 and is_IP are not initialized outside of the loop that
checks the received packet, so if the packet is dropped these
variables cause a NameError in the verification steps.
Add a line that sets these variables to None prior to the check,
then verifies they are not None directly after.

Fixes: 8c9a7471a0e6 ("dts: add checksum offload test suite")

Signed-off-by: Dean Marx <dmarx@iol.unh.edu>
Reviewed-by: Patrick Robb <probb@iol.unh.edu>
Reviewed-by: Luca Vizzarro <luca.vizzarro@arm.com>
---
 dts/tests/TestSuite_checksum_offload.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/dts/tests/TestSuite_checksum_offload.py b/dts/tests/TestSuite_checksum_offload.py
index 1a933563b6..f94d12232b 100644
--- a/dts/tests/TestSuite_checksum_offload.py
+++ b/dts/tests/TestSuite_checksum_offload.py
@@ -86,12 +86,17 @@ def send_packet_and_verify_checksum(
         testpmd.start()
         self.send_packet_and_capture(packet=packet)
         verbose_output = testpmd.extract_verbose_output(testpmd.stop())
+        is_IP = is_L4 = None
         for packet in verbose_output:
             if packet.dst_mac == id:
-                isIP = PacketOffloadFlag.RTE_MBUF_F_RX_IP_CKSUM_GOOD in packet.ol_flags
-                isL4 = PacketOffloadFlag.RTE_MBUF_F_RX_L4_CKSUM_GOOD in packet.ol_flags
-        self.verify(isL4 == goodL4, "Layer 4 checksum flag did not match expected checksum flag.")
-        self.verify(isIP == goodIP, "IP checksum flag did not match expected checksum flag.")
+                is_IP = PacketOffloadFlag.RTE_MBUF_F_RX_IP_CKSUM_GOOD in packet.ol_flags
+                is_L4 = PacketOffloadFlag.RTE_MBUF_F_RX_L4_CKSUM_GOOD in packet.ol_flags
+        self.verify(
+            is_IP is not None and is_L4 is not None,
+            "Test packet was dropped when it should have been received.",
+        )
+        self.verify(is_L4 == goodL4, "Layer 4 checksum flag did not match expected checksum flag.")
+        self.verify(is_IP == goodIP, "IP checksum flag did not match expected checksum flag.")
 
     def setup_hw_offload(self, testpmd: TestPmdShell) -> None:
         """Sets IP, UDP, and TCP layers to hardware offload.
-- 
2.51.0