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Andrii Nakryiko says: ==================== This patch set implements initial version (as discussed at LSF/MM2019 conference) of a new way to specify BPF maps, relying on BTF type information, which allows for easy extensibility, preserving forward and backward compatibility. See details and examples in description for patch #6. [0] contains an outline of follow up extensions to be added after this basic set of features lands. They are useful by itself, but also allows to bring libbpf to feature-parity with iproute2 BPF loader. That should open a path forward for BPF loaders unification. Patch #1 centralizes commonly used min/max macro in libbpf_internal.h. Patch #2 extracts .BTF and .BTF.ext loading loging from elf_collect(). Patch #3 simplifies elf_collect() error-handling logic. Patch #4 refactors map initialization logic into user-provided maps and global data maps, in preparation to adding another way (BTF-defined maps). Patch #5 adds support for map definitions in multiple ELF sections and deprecates bpf_object__find_map_by_offset() API which doesn't appear to be used anymore and makes assumption that all map definitions reside in single ELF section. Patch #6 splits BTF intialization from sanitization/loading into kernel to preserve original BTF at the time of map initialization. Patch #7 adds support for BTF-defined maps. Patch #8 adds new test for BTF-defined map definition. Patches #9-11 convert test BPF map definitions to use BTF way. [0] https://lore.kernel.org/bpf/CAEf4BzbfdG2ub7gCi0OYqBrUoChVHWsmOntWAkJt47=FE+km+A@mail.gmail.com/ v1->v2: - more BTF-sanity checks in parsing map definitions (Song); - removed confusing usage of "attribute", switched to "field; - split off elf_collect() refactor from btf loading refactor (Song); - split selftests conversion into 3 patches (Stanislav): 1. test already relying on BTF; 2. tests w/ custom types as key/value (so benefiting from BTF); 3. all the rest tests (integers as key/value, special maps w/o BTF support). - smaller code improvements (Song); rfc->v1: - error out on unknown field by default (Stanislav, Jakub, Lorenz); ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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.