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Andrii Nakryiko
3d1af4bd84
Anton Protopopov says: ==================== Add fd_array_cnt attribute for BPF_PROG_LOAD Add a new attribute to the bpf(BPF_PROG_LOAD) system call. If this new attribute is non-zero, then the fd_array is considered to be a continuous array of the fd_array_cnt length and to contain only proper map file descriptors or btf file descriptors. This change allows maps (and btfs), which aren't referenced directly by a BPF program, to be bound to the program _and_ also to be present during the program verification (so BPF_PROG_BIND_MAP is not enough for this use case). The primary reason for this change is that it is a prerequisite for adding "instruction set" maps, which are both non-referenced by the program and must be present during the program verification. The first five commits add the new functionality, the sixth adds corresponding self-tests, and the last one is a small additional fix. v1 -> v2: * rewrite the add_fd_from_fd_array() function (Eduard) * a few cleanups in selftests (Eduard) v2 -> v3: * various renamings (Alexei) * "0 is not special" (Alexei, Andrii) * do not alloc memory on fd_array init (Alexei) * fix leaking maps for error path (Hou Tao) * use libbpf helpers vs. raw syscalls (Andrii) * add comments on __btf_get_by_fd/__bpf_map_get (Alexei) * remove extra code (Alexei) v3 -> v4: * simplify error path when parsing fd_array * libbpf: pass fd_array_cnt only in prog_load (Alexei) * selftests patch contained extra code (Alexei) * renames, fix comments (Alexei) v4 -> v5: * Add btfs to env->used_btfs (Andrii) * Fix an integer overflow (Andrii) * A set of cleanups for selftests (Andrii) ==================== Link: https://patch.msgid.link/20241213130934.1087929-1-aspsk@isovalent.com Signed-off-by: Andrii Nakryiko <andrii@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 reStructuredText 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.