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This patch tries to implement XDP for tun. The implementation was split into two parts: - fast path: small and no gso packet. We try to do XDP at page level before build_skb(). For XDP_TX, since creating/destroying queues were completely under control of userspace, it was implemented through generic XDP helper after skb has been built. This could be optimized in the future. - slow path: big or gso packet. We try to do it after skb was created through generic XDP helpers. Test were done through pktgen with small packets. xdp1 test shows ~41.1% improvement: Before: ~1.7Mpps After: ~2.3Mpps xdp_redirect to ixgbe shows ~60% improvement: Before: ~0.8Mpps After: ~1.38Mpps Suggested-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.