[Bug 207262] NETMAP with kevent don't process incoming packets in different thread

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207262

            Bug ID: 207262
           Summary: NETMAP with kevent don't process incoming packets in
                    different thread
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: slw at zxy.spb.ru

NETMAP don't process incoming packets with next conditions:

1. open /dev/netmap and do NIOCREGIF (NR_REG_ONE_NIC for concrete) in one
thread
2. kevent this fd and register event EVFILT_READ with EV_ADD|EV_ENABLE|EV_CLEAR
in other thread

got EVFILT_READ but all head,tail,cur still 0

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