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2de2f7f40e
Add support for XDP adjust head by allocating a 256B header region that XDP programs can grow into. This is only enabled when a XDP program is loaded. In order to ensure that we do not have to unwind queue headroom push queue setup below bpf_prog_add. It reads better to do a prog ref unwind vs another queue setup call. At the moment this code must do a full reset to ensure old buffers without headroom on program add or with headroom on program removal are not used incorrectly in the datapath. Ideally we would only have to disable/enable the RX queues being updated but there is no API to do this at the moment in virtio so use the big hammer. In practice it is likely not that big of a problem as this will only happen when XDP is enabled/disabled changing programs does not require the reset. There is some risk that the driver may either have an allocation failure or for some reason fail to correctly negotiate with the underlying backend in this case the driver will be left uninitialized. I have not seen this ever happen on my test systems and for what its worth this same failure case can occur from probe and other contexts in virtio framework. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.