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Alexei Starovoitov says: ==================== The last few month BPF community has been discussing an approach to call chaining, since exiting bpt_tail_call() mechanism used in production XDP programs has plenty of downsides. The outcome of these discussion was a conclusion to implement dynamic re-linking of BPF programs. Where rootlet XDP program attached to a netdevice can programmatically define a policy of execution of other XDP programs. Such rootlet would be compiled as normal XDP program and provide a number of placeholder global functions which later can be replaced with future XDP programs. BPF trampoline, function by function verification were building blocks towards that goal. The patch 1 is a final building block. It introduces dynamic program extensions. A number of improvements like more flexible function by function verification and better libbpf api will be implemented in future patches. v1->v2: - addressed Andrii's comments - rebase ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.