[Bug 207261] NETMAP don't do TX sync with kqueue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207261

--- Comment #2 from slw at zxy.spb.ru ---
(In reply to Vincenzo Maffione from comment #1)

10.2-STABLE, netmap port ixgbe.

I am don't retest after discovery in 2016.

Code snippet need to re-implement. About example:

EV_SET(kp, fd, EVFILT_WRITE, EV_ADD | EV_ENABLE, 0, 0, &event_info[kidx]);
...
while(1) {
...
  int nevent = kevent();
...
}

In this example kevent() call don't sync TX ring pointers.

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