Currently, the documentation of RTE_MBUF_F_TX_UDP_CKSUM in
https://doc.dpdk.org/api/rte__mbuf__core_8h.html#ada511d6f30184b374ba2248c26af8ede
is very sparse:

> UDP cksum of TX pkt. computed by NIC. 

I think it should mention which fields should be set.
Some bug reports e.g. https://github.com/amzn/amzn-drivers/issues/176
https://github.com/amzn/amzn-drivers/issues/79 states that you need to set
m3_len, total_length, dgram_cksum to the pseudo-header checksum etc. (not sure
about this).

What is the actual requirement of that flag, and how should the documentation
be edited?