[Bloat] What is the ifb4 interface?

[Kenneth Porter]

I'd never understood what the ifb4 interface was for. Here's a nice 
diagram from an sqm-scripts GitHub issue.

Ken


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Subject: 	Re: [tohojo/sqm-scripts] diagram needed (#125)
Date: 	Tue, 17 Nov 2020 19:36:47 -0800
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Well it's not great, maybe something like this
example 
<https://user-images.githubusercontent.com/476401/99479609-5ad1a580-290b-11eb-8a36-e8e0757431c2.png> 
Here's the dia file (gzip'd cause github)
example.dia.gz 
<https://github.com/tohojo/sqm-scripts/files/5557551/example.dia.gz>

I was trying to wrap my head around why ifb4 existed and how it worked. 
Maybe it could somehow explain that qdisc's can only work on packets 
leaving a device and that's the reason for the ifb4.

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