CFT: major update to if_ure

[John-Mark Gurney]

Hello,

I'd like people who have ure (RealTek) based USB devices to test
review D25809[0].

This update adds support for:
- HW VLAN tagging
- HW checksum offload for IPv4 and IPv6
- tx and rx aggreegation (for full gige speeds)
- multiple transactions

In my testing, I am able to get 900-950Mbps depending upon
TCP or UDP, which is a significant improvement over the previous
91Mbps (~8kint/sec*1500bytes/packet*1packet/int).

Thanks.

[0] https://reviews.freebsd.org/D25809

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."