Has anyone reviewed the various available usb3 gigabit adapters for 
features, linux driver support, bufferbloat, BQL(can usb NICs do BQL?), etc?

With some single board computers having reasonable usb3 now, I can see 
people making routers out of them. But it would also be good to know if 
that's reasonable and in general which to recommend.

Some searching in drivers/net/usb/ for gigabit capable things I found:

aqc111: Aquantia AQtion USB to 5GbE
ax88179_178a: ASIX AX88179, ASIX AX88178A, Sitcomm LN-032
lan78xx: 7800/7801 usb3 devices
r8152: r8153 usb3 devices
smsc75xx: only usb2?
Maybe there are others?

In real life I have:

1) an r8152 device (came with a Asus laptop). It's been reliable.

2) an ax88179_178a device 
(https://www.amazon.com/gp/product/B00MYTSN18). Worked at first, but 
started acting up after a recent kernel upgrade and I haven't tracked 
down what changed yet.

I've attached some ethtool output for the features of each.

Ebay has tons of $10 options, but little details. Some also have 
integrated USB ports on them, some are "docking station" like and have 
hdmi as well. If you search for "usb 3.2" you can find some that are 
2.5gbit.

Also some interesting (but from 2019) info in this post
https://raspberrypi.stackexchange.com/questions/100040/what-sort-of-throughput-is-achievabe-over-the-usb-3-0-port-on-the-pi-4

-- 
Matt Taggart
matt@lackof.org