David Laight <David.Laight@ACULAB.COM> :
[David's life]

The version below fixes several bugs and refuses the frame or timing
values it can't set. Hayes's Tx parameters still need to be pluged
into rtl_coalesce_scale.

Rx delays seem lower than what I had expected when testing with a 8168b
(XID 18000000).

https://www.spinics.net/lists/netdev/msg218207.html