linux-dev/kernel/bpf/preload/iterators/README, branch masterLinux kernel development work - see feature brancheshttps://git.zx2c4.com/linux-dev/atom/kernel/bpf/preload/iterators/README?h=master2020-08-20T14:02:36Zbpf: Add BPF program and map iterators as built-in BPF programs.2020-08-20T14:02:36ZAlexei Starovoitovast@kernel.org2020-08-19T04:27:57Zurn:sha1:f0fdfefb2d4da5b76c3f810be0edb2ab90360224
The program and map iterators work similar to seq_file-s.
Once the program is pinned in bpffs it can be read with "cat" tool
to print human readable output. In this case about BPF programs and maps.
For example:
$ cat /sys/fs/bpf/progs.debug
id name attached
5 dump_bpf_map bpf_iter_bpf_map
6 dump_bpf_prog bpf_iter_bpf_prog
$ cat /sys/fs/bpf/maps.debug
id name max_entries
3 iterator.rodata 1
To avoid kernel build dependency on clang 10 separate bpf skeleton generation
into manual "make" step and instead check-in generated .skel.h into git.
Unlike 'bpftool prog show' in-kernel BTF name is used (when available)
to print full name of BPF program instead of 16-byte truncated name.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200819042759.51280-3-alexei.starovoitov@gmail.com