dts: add reception check to checksum offload suite

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: 8c9a747 ("dts: add checksum offload test suite")

Signed-off-by: Dean Marx <[email protected]>
Reviewed-by: Patrick Robb <[email protected]>
Reviewed-by: Luca Vizzarro <[email protected]>

Author: dmarxIOL

dts/tests/TestSuite_checksum_offload.py

@@ -85,10 +85,15 @@ 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 testpmd_packet in verbose_output:
             if testpmd_packet.l4_dport == id:
                 is_IP = PacketOffloadFlag.RTE_MBUF_F_RX_IP_CKSUM_GOOD in testpmd_packet.ol_flags
                 is_L4 = PacketOffloadFlag.RTE_MBUF_F_RX_L4_CKSUM_GOOD in testpmd_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 == good_L4, "Layer 4 checksum flag did not match expected checksum flag.")
         self.verify(is_IP == good_IP, "IP checksum flag did not match expected checksum flag.")