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| author |   Quentin Monnet <quentin@isovalent.com> | 2023-04-05 14:21:17 +0100 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2023-04-05 21:27:27 -0700 |
| commit | 05a06be722896e51f65dbbb6a3610f85a8353d6b (patch) | |
| tree | e4fb1ce5ea872be023e7a1d04be49d68c6238f53 /tools/bpf/bpftool/prog.c | |
| parent | bpftool: Support inline annotations when dumping the CFG of a program (diff) | |
| download | linux-05a06be722896e51f65dbbb6a3610f85a8353d6b.tar.xz linux-05a06be722896e51f65dbbb6a3610f85a8353d6b.zip | |
bpftool: Return an error on prog dumps if both CFG and JSON are required
We do not support JSON output for control flow graphs of programs with
bpftool. So far, requiring both the CFG and JSON output would result in
producing a null JSON object. It makes more sense to raise an error
directly when parsing command line arguments and options, so that users
know they won't get any output they might expect.
If JSON is required for the graph, we leave it to Graphviz instead:
# bpftool prog dump xlated <REF> visual | dot -Tjson
Suggested-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/r/20230405132120.59886-5-quentin@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/bpf/bpftool/prog.c')
| -rw-r--r-- | tools/bpf/bpftool/prog.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index d855118f0d96..736defc6e5d0 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -849,9 +849,7 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode, dd.finfo_rec_size = info->func_info_rec_size; dd.prog_linfo = prog_linfo; - if (json_output && visual) - jsonw_null(json_wtr); - else if (json_output) + if (json_output) dump_xlated_json(&dd, buf, member_len, opcodes, linum); else if (visual) dump_xlated_cfg(&dd, buf, member_len); @@ -940,6 +938,10 @@ static int do_dump(int argc, char **argv) usage(); goto exit_close; } + if (json_output && visual) { + p_err("'visual' is not compatible with JSON output"); + goto exit_close; + } if (json_output && nb_fds > 1) jsonw_start_array(json_wtr); /* root array */ |