src/sys/net/netmap_user.h, branch release/8.4.0

src/sys/net/netmap_user.h, branch release/8.4.0 FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=release%2F8.4.0 2012-02-14T22:49:34Z MFC: bring in the core netmap code (disconnected 2012-02-14T22:49:34Z Luigi Rizzo luigi@FreeBSD.org 2012-02-14T22:49:34Z urn:sha1:52e0951243960d657daec06bc8feacc881b2e71f from the build). As usual, device driver patches will come separately.