[PATCH v4] app/testpmd: txonly multiflow port change support

[Stephen Hemminger]

On Wed, 19 Apr 2023 17:51:18 +0530
"Singh, Aman Deep" <aman.deep.singh at intel.com> wrote:

> On 4/12/2023 11:46 PM, Joshua Washington wrote:
> > Google cloud routes traffic using IP addresses without the support of MAC
> > addresses, so changing source IP address for txonly-multi-flow can have
> > negative performance implications for net/gve when using testpmd. This
> > patch updates txonly multiflow mode to modify source ports instead of
> > source IP addresses.  
> 
> Generally routing is based on DST IP addresses, was SRC IP also having an
> impact in your case ?

Most hypervisor infrastructures will not allow a guest to use a source
address that has not been allocated to that guest. Therefore when using
multiple source addresses, either the guest has to be configured to have
all the addresses it will use, or the test needs to only use one source address.