I might be confusing myself, but need to ask the question. What does flent define as upload and download?

Netperf docs say:
The TCP_STREAM test is the default test in netperf. It is quite simple, transferring some quantity of data from the system running netperf to the system running netserver.

So why, when I look at tcp_1up_noping.conf does the DATA_SETS have 'test': 'TCP_STREAM' in the 'TCP_upload' dictionary?

Second question: Is there any documentation that can help me figure out exactly what traffic is running in each test type?
I've tried looking at the .conf and .inc files, in flent/tests but can't figure it out.