Support for --flip flag?

[BoseSean]

Thank you for this great project, super useful for ib testing.
However, i have roughly looked into the source code, and found that --flip argument is actually not implemented.
Does the team have plan to work on this feature? Or, does '--flip' only work for certain tests?

[verderog]

I came here to ask this. Monitoring network traffic via btop++ v1.2.13 and specifying the qperf -f1 parameter for either tcp_bw and udp_bw tests shows no difference in behavior. The sender and receiver do not appear to change.