Fun with HAST and inter-host connections

Hans Petter Selasky hps at
Wed Sep 6 10:59:21 UTC 2017

On 09/02/17 18:21, Ian Smith wrote:
> On Sun, 3 Sep 2017 02:10:51 +1000, Ian Smith wrote:
>   > In freebsd-questions Digest, Vol 691, Issue 4, Message: 10
>   > On Wed, 30 Aug 2017 22:40:03 +0100 Frank Leonhardt<freebsd-doc at>  wrote:
>   > Been following this thread with idle curiousity through all the options.
>   >
>   > It's all out of my experience, but if anyone knows what's what with USB
>   > 3.1 and whether crazy or not, it'd be Hans Petter (cc'd / dobbed in:)


 From what I know the USB XHCI 3.1 is backwards compatible with the 
existing XHCI driver. Correct me if I'm wrong.

Unfortunately XHCI is host only so you'll need some kind of middle 
device if you want to connect to XHCI controllers together. Non of the 
existing USB ethernet drivers are full optimised for FreeBSD's network 
and USB stack and all network traffic is copied at least once. It would 
be interesting to offload mbufs directly into USB w/o this additional 


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