Hi,
This set adds a new command to bpftool in order to dump a list of
eBPF-related parameters for the system (or for a specific network
device) to the console. Once again, this is based on a suggestion from
Daniel.
At this time, output includes:
- Availability of bpf() system call
- Availability of bpf() system call for unprivileged users
- JIT status (enabled or not, with or without debugging traces)
- JIT hardening status
- JIT kallsyms exports status
- Status of kernel compilation options related to BPF features
- Release number of the running kernel
- Availability of known eBPF program types
- Availability of known eBPF map types
- Availability of known eBPF helper functions
There are three different ways to dump this information at this time:
- Plain output dumps probe results in plain text. It is the most
flexible options for providing descriptive output to the user, but
should not be relied upon for parsing the output.
- JSON output is supported.
- A third mode, available through the "macros" keyword appended to the
command line, dumps some of those parameters (not all) as a series of
"#define" directives, that can be included into a C header file for
example.
Probes for supported program and map types, and supported helpers, are
directly added to libbpf, so that other applications (or selftests) can
reuse them as necessary.
If the user does not have root privileges (or more precisely, the
CAP_SYS_ADMIN capability) detection will be erroneous for most
parameters. Therefore, forbid non-root users to run the command.
v3
- Do not probe kernel version in bpftool (just retrieve it to probe support
for kprobes in libbpf).
- Change the way results for helper support is displayed: now one list of
compatible helpers for each program type (and C-style output gets a
HAVE_PROG_TYPE_HELPER(prog_type, helper) macro to help with tests. See
patches 6, 7.
- Address other comments from feedback from v2 (please refer to individual
patches' history).
v2 (please also refer to individual patches' history):
- Move probes for prog/map types, helpers, from bpftool to libbpf.
- Move C-style output as a separate patch, and restrict it to a subset of
collected information (bpf() availability, prog/map types, helpers).
- Now probe helpers with all supported program types, and display a list of
compatible program types (as supported on the system) for each helper.
- NOT addressed: grouping compilation options for kernel into subsections
(patch 3) (I don't see an easy way of grouping them at the moment, please
see also the discussion on v1 thread).
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Jesper Dangaard Brouer <bro...@redhat.com>
Cc: Stanislav Fomichev <s...@google.com>
Quentin Monnet (9):
tools: bpftool: add basic probe capability, probe syscall availability
tools: bpftool: add probes for /proc/ eBPF parameters
tools: bpftool: add probes for kernel configuration options
tools: bpftool: add probes for eBPF program types
tools: bpftool: add probes for eBPF map types
tools: bpftool: add probes for eBPF helper functions
tools: bpftool: add C-style "#define" output for probes
tools: bpftool: add probes for a network device
tools: bpftool: add bash completion for bpftool probes
.../bpftool/Documentation/bpftool-cgroup.rst | 1 +
.../bpftool/Documentation/bpftool-feature.rst | 85 +++
.../bpf/bpftool/Documentation/bpftool-map.rst | 1 +
.../bpf/bpftool/Documentation/bpftool-net.rst | 1 +
.../bpftool/Documentation/bpftool-perf.rst | 1 +
.../bpftool/Documentation/bpftool-prog.rst | 1 +
tools/bpf/bpftool/Documentation/bpftool.rst | 1 +
tools/bpf/bpftool/bash-completion/bpftool | 19 +
tools/bpf/bpftool/feature.c | 701 ++++++++++++++++++
tools/bpf/bpftool/main.c | 3 +-
tools/bpf/bpftool/main.h | 4 +
tools/bpf/bpftool/map.c | 4 +-
tools/lib/bpf/Build | 2 +-
tools/lib/bpf/libbpf.h | 14 +
tools/lib/bpf/libbpf.map | 3 +
tools/lib/bpf/libbpf_probes.c | 241 ++++++
16 files changed, 1079 insertions(+), 3 deletions(-)
create mode 100644 tools/bpf/bpftool/Documentation/bpftool-feature.rst
create mode 100644 tools/bpf/bpftool/feature.c
create mode 100644 tools/lib/bpf/libbpf_probes.c
--
2.17.1
