Re: [PATCH v5] app/testpmd: txonly multiflow port change support

[Joshua Washington <joshwash@google.com>]

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Hello,

I believe my original solution was something closer to what you are
suggesting for backward compatibility. I originally had a flag that enabled
changing source port instead of source IP addresses, but I received
feedback that adding an extra flag was complicating things too much from
Stephen.

On a VM, the purpose of using multi-flow is similar to that of bare metal:
to test RSS in the RX side. However, generating traffic by changing source
IP address can cause inconsistencies in performance due to protections in
cloud infrastructure from sending packets from a different source IP
address than is provisioned for the VM. Changing source UDP port to test
RSS should be functionally equivalent while allowing VMs to send traffic
from a single source IP address.

If everyone agrees that adding --txonly-multi-flow as an option as well as
keeping the flag is an acceptable way of moving forward, I can do that.

Thanks,
Josh

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