linux.git/kernel/bpf/preload/iterators, branch v6.12.80

bpf: make preloaded map iterators to display map elements count

2023-07-06T19:42:25+00:00

Add another column to the /sys/fs/bpf/maps.debug iterator to display
cur_entries, the current number of entries in the map as is returned
by the bpf_map_sum_elem_count kfunc. Also fix formatting.

Example:

    # cat /sys/fs/bpf/maps.debug
      id name             max_entries  cur_entries
       2 iterator.rodata            1            0
     125 cilium_auth_map       524288          666
     126 cilium_runtime_          256            0
     127 cilium_signals            32            0
     128 cilium_node_map        16384         1344
     129 cilium_events             32            0
     ...

Signed-off-by: Anton Protopopov 
Link: https://lore.kernel.org/r/20230706133932.45883-5-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov

bpf: Replace deprecated -target with --target= for Clang

2023-06-29T13:46:17+00:00

The -target option has been deprecated since clang 3.4 in 2013. Therefore, use
the preferred --target=bpf form instead. This also matches how we use --target=
in scripts/Makefile.clang.

Signed-off-by: Fangrui Song 
Signed-off-by: Daniel Borkmann 
Acked-by: Yonghong Song 
Acked-by: Quentin Monnet 
Link: https://github.com/llvm/llvm-project/commit/274b6f0c87a6a1798de0a68135afc7f95def6277
Link: https://lore.kernel.org/bpf/20230624001856.1903733-1-maskray@google.com

bpf: iterators: Split iterators.lskel.h into little- and big- endian versions

2023-01-28T20:45:15+00:00

iterators.lskel.h is little-endian, therefore bpf iterator is currently
broken on big-endian systems. Introduce a big-endian version and add
instructions regarding its generation. Unfortunately bpftool's
cross-endianness capabilities are limited to BTF right now, so the
procedure requires access to a big-endian machine or a configured
emulator.

Signed-off-by: Ilya Leoshkevich 
Link: https://lore.kernel.org/r/20230128000650.1516334-25-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov

bpf: iterators: Build and use lightweight bootstrap version of bpftool

2022-07-15T19:01:30+00:00

kernel/bpf/preload/iterators use bpftool for vmlinux.h, skeleton, and
static linking only. So we can use lightweight bootstrap version of
bpftool to handle these, and it will be faster.

Suggested-by: Andrii Nakryiko 
Signed-off-by: Pu Lehui 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20220714024612.944071-4-pulehui@huawei.com

bpf: Convert bpf_preload.ko to use light skeleton.

2022-02-10T22:31:51+00:00

The main change is a move of the single line
  #include "iterators.lskel.h"
from iterators/iterators.c to bpf_preload_kern.c.
Which means that generated light skeleton can be used from user space or
user mode driver like iterators.c or from the kernel module or the kernel itself.
The direct use of light skeleton from the kernel module simplifies the code,
since UMD is no longer necessary. The libbpf.a required user space and UMD. The
CO-RE in the kernel and generated "loader bpf program" used by the light
skeleton are capable to perform complex loading operations traditionally
provided by libbpf. In addition UMD approach was launching UMD process
every time bpffs has to be mounted. With light skeleton in the kernel
the bpf_preload kernel module loads bpf iterators once and pins them
multiple times into different bpffs mounts.

Signed-off-by: Alexei Starovoitov 
Signed-off-by: Daniel Borkmann 
Acked-by: Yonghong Song 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20220209232001.27490-6-alexei.starovoitov@gmail.com

bpf: Update iterators.lskel.h.

2022-02-10T22:31:51+00:00

Light skeleton and skel_internal.h have changed.
Update iterators.lskel.h.

Signed-off-by: Alexei Starovoitov 
Signed-off-by: Daniel Borkmann 
Acked-by: Yonghong Song 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20220209232001.27490-5-alexei.starovoitov@gmail.com

bpf: Open code obj_get_info_by_fd in bpf preload.

2022-02-01T22:56:18+00:00

Open code obj_get_info_by_fd in bpf preload.
It's the last part of libbpf that preload/iterators were using.

Signed-off-by: Alexei Starovoitov 
Signed-off-by: Daniel Borkmann 
Acked-by: Martin KaFai Lau 
Link: https://lore.kernel.org/bpf/20220131220528.98088-7-alexei.starovoitov@gmail.com

bpf: Convert bpf preload to light skeleton.

2022-02-01T22:56:18+00:00

Convert bpffs preload iterators to light skeleton.

Signed-off-by: Alexei Starovoitov 
Signed-off-by: Daniel Borkmann 
Acked-by: Martin KaFai Lau 
Link: https://lore.kernel.org/bpf/20220131220528.98088-6-alexei.starovoitov@gmail.com

bpf: Remove unnecessary setrlimit from bpf preload.

2022-02-01T22:56:18+00:00

BPF programs and maps are memcg accounted. setrlimit is obsolete.
Remove its use from bpf preload.

Signed-off-by: Alexei Starovoitov 
Signed-off-by: Daniel Borkmann 
Acked-by: Martin KaFai Lau 
Link: https://lore.kernel.org/bpf/20220131220528.98088-5-alexei.starovoitov@gmail.com

bpftool: Add install-bin target to install binary only

2021-10-08T19:02:40+00:00

With "make install", bpftool installs its binary and its bash completion
file. Usually, this is what we want. But a few components in the kernel
repository (namely, BPF iterators and selftests) also install bpftool
locally before using it. In such a case, bash completion is not
necessary and is just a useless build artifact.

Let's add an "install-bin" target to bpftool, to offer a way to install
the binary only.

Signed-off-by: Quentin Monnet 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20211007194438.34443-13-quentin@isovalent.com