How netmap works with NS_MOREFRAG?

[hittingnote]

When frags > 1 in the pkt-gen demo, I found that the receiver only receives the first frag sent by the sender. So, I want to figure out what I've missed when using NS_MOREFRAG?

[vmaffione]

For NS_MORERFRAG to work, you need your netmap adapter (port) to support it. Only some netmap adapters actually support fragmented transmit and receive. Looking for NAF_MOREFRAG in the code will tell you which ones are supported.

This means that if you are doing a transmit + receive experiment, both transmitter and receiver need to have NS_MOREFRAG support, and jumbo frames enabled so that you will have one fragment per 4K page.