[DTS/tests Bug 2045] UDP special checksum cases

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=2045

--- Comment #1 from Morten Brørup (mb at smartsharesystems.com) ---
Correction:
An IPv4 UDP packet received by the DUT with zero in the UDP checksum field
should be reported as "UDP Checksum NONE" (not "UDP Checksum GOOD").

Reason:
Such a packet can be forwarded as is (i.e. transmitted without updating its
checksum field), no problem there.
However, if the packet is modified, e.g. for NAT, a simple incremental update
cannot be applied to the checksum; the packet needs special treatment in such
cases.

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