Why haven't NetMap or MegaPipe been merged?

[Greg KH]

On Tue, Feb 13, 2018 at 01:00:39PM -0500, Demi Obenour wrote:
> Not sure.  The NetMap team at least told me that upstream didn't want their
> code.  This might be because NetMap requires special vendor-provided (but
> still open source, if I understand correctly) drivers for optimum
> performance, or it might be because they use a single codebase to support
> Windows, Linux, and FreeBSD, if I understand correctly.

Well, "special" drivers, as well as a compatibility layer for other
operating systems are a very good reason to not get the code merged into
the kernel.  No subsystem would ever accept such an odd requirement.

greg k-h