netmap in GENERIC, by default, on HEAD

[Jim Thompson]

> On Nov 5, 2014, at 9:47 AM, Andrey V. Elsukov <bu7cher at yandex.ru> wrote:
> 
> Sorry, I showed wrong numbers here. IPSEC kernel in this test gives 2.4
> Mpps, but with encryption only 180 kpps.

This is more in-line with what I'd expect, assuming AES-CBC-HMAC. 

Improving the situation wrt encryption overhead seems straight-forward or, at least, approachable.