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KernelTun: Use IFF_NO_PI on Linux, remove LINUX_ETHERTAP mode #397

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KernelTun: Use IFF_NO_PI on Linux, remove LINUX_ETHERTAP mode #397

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Commits on May 2, 2018

  1. KernelTun: Use IFF_NO_PI on Linux, remove LINUX_ETHERTAP mode 

    This commit adds flag IFF_NO_PI to tun/tap interface settings on Linux.
It flag changes frame format in order not to include protocol
information header. That is, with this flag, frames received/send from
tun/tap fd consist solely of raw underlying protocol (Ethernet/IP)
frames.

Protocol information header is not used by the element in any way, but
its presence adds a requirement for pulling packet data on receive and
pushing it before writing packet to the fd. Such a push becomes an
expensive push when there is is no enough headroom in packet, for
example when using native netmap buffers which do not have headroom.

Adding IFF_NO_PI flag eliminates the need for pulling and pushing
packet data completely.

Moreover, this commit removes support for LINUX_ETHERTAP mode. Ethertap
driver was removed from the kernel more than 15 years ago. Removal of
this mode significantly simplifies the logic within the element.
    @piotrjurkiewicz
    piotrjurkiewicz committed May 2, 2018
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