Mockup driver for NetFPGA SUME on FreeBSD made with iflib(4) using netgraph(4) for RX/TX.

This is an experimental driver for me to play with iflib and to learn how it works in order to write a device driver for NetFPGA SUME sometimes in the future. It is mostly made by copying/pasting the existing code from ng_eiface(4) and if_em(4) thus creating something that kind of works, but panics when something happens (I am not yet sure what something is).

For this mockup module, the NetFPGA does not need to be flashed, but here are instructions for flashing it with reference NIC project (I used another Linux machine to do it):

0. install Digilent Adept Tools (Runtime and Utilities) from https://reference.digilentinc.com/reference/software/adept/start
1. connect your machine with the NetFPGA via USB
2. build or download the NIC from http://www.cl.cam.ac.uk/research/srg/netos/projects/netfpga/bitfiles/NetFPGA-SUME-live/1.9.0/reference_nic/reference_nic.bit
3. flash the board with:

dsumecfg -d NetSUME write -verbose -s 2 -f reference_nic.bit # flash to flash section 2
dsumecfg -d NetSUME setbootsec -s 2 # load flash section 2 on board boot-up
dsumecfg -d NetSUME reconfig -s 2 # reconfigure the board from section 2

1. Load the module with make load - this will create a virtual ngf0 interface.
2. Create an eiface:

printf "mkpeer eiface ether ether" | ngctl -f -
printf "name ngeth0: eifc0" | ngctl -f -

3. Connect both interfaces:

printf "mkpeer eifc0: pipe ether upper" | ngctl -f -
printf "name eifc0:ether pipe" | ngctl -f -
printf "connect pipe: ngf0: lower ether" | ngctl -f -
ifconfig ngeth0 name eifc0

4. Jail the eiface:

jail -c name=out vnet children.max=2 persist
ifconfig eifc0 vnet out
jexec out ifconfig eifc0 10.0.0.1/24 promisc up

5. Set the ngf0 and ping:

ifconfig ngf0 10.0.0.2/24 promisc up
ping 10.0.0.1

6. ???

7. Panic at some point.