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"Daniel T. Lee" says: ==================== Currently, there are many programs under samples/bpf to test the various functionality of BPF that have been developed for a long time. However, the kernel (BPF) has changed a lot compared to the 2016 when some of these test programs were first introduced. Therefore, some of these programs use the deprecated function of BPF, and some programs no longer work normally due to changes in the API. To list some of the kernel changes that this patch set is focusing on, - legacy BPF map declaration syntax support had been dropped [1] - bpf_trace_printk() always append newline at the end [2] - deprecated styled BPF section header (bpf_load style) [3] - urandom_read tracepoint is removed (used for testing overhead) [4] - ping sends packet with SOCK_DGRAM instead of SOCK_RAW [5]* - use "vmlinux.h" instead of including individual headers In addition to this, this patchset tries to modernize the existing testing scripts a bit. And for network-related testing programs, a separate header file was created and applied. (To use the Endianness conversion function from xdp_sample and bunch of constants) [1]: https://github.com/libbpf/libbpf/issues/282 [2]: commitac5a72ea5c("bpf: Use dedicated bpf_trace_printk event instead of trace_printk()") [3]: commitceb5dea565("samples: bpf: Remove bpf_load loader completely") [4]: commit14c174633f("random: remove unused tracepoints") [5]: https://lwn.net/Articles/422330/ *: This is quite old, but I'm not sure why the code was initially developed to filter only SOCK_RAW. ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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.