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| author |   Quentin Monnet <quentin.monnet@netronome.com> | 2018-12-05 10:28:24 +0000 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-12-05 16:41:52 +0100 |
| commit | 30da46b5dc3a9a14db11706d841440e28b12bb53 (patch) | |
| tree | 32ed4dde5cbce0f5ec6cdba14b33ef245de2579a /tools/bpf/bpftool/prog.c | |
| parent | Merge branch 'bpf-jit-overridable-alloc' (diff) | |
| download | linux-dev-30da46b5dc3a9a14db11706d841440e28b12bb53.tar.xz linux-dev-30da46b5dc3a9a14db11706d841440e28b12bb53.zip | |
tools: bpftool: add a command to dump the trace pipe
BPF programs can use the bpf_trace_printk() helper to print debug
information into the trace pipe. Add a subcommand
"bpftool prog tracelog" to simply dump this pipe to the console.
This is for a good part copied from iproute2, where the feature is
available with "tc exec bpf dbg". Changes include dumping pipe content
to stdout instead of stderr and adding JSON support (content is dumped
as an array of strings, one per line read from the pipe). This version
is dual-licensed, with Daniel's permission.
Cc: Daniel Borkmann <daniel@iogearbox.net>
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/bpf/bpftool/prog.c')
| -rw-r--r-- | tools/bpf/bpftool/prog.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index 56db61c5a91f..54c8dbf05c9c 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -1140,6 +1140,7 @@ static int do_help(int argc, char **argv) " [pinmaps MAP_DIR]\n" " %s %s attach PROG ATTACH_TYPE [MAP]\n" " %s %s detach PROG ATTACH_TYPE [MAP]\n" + " %s %s tracelog\n" " %s %s help\n" "\n" " " HELP_SPEC_MAP "\n" @@ -1158,7 +1159,7 @@ static int do_help(int argc, char **argv) "", bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2], - bin_name, argv[-2], bin_name, argv[-2]); + bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2]); return 0; } @@ -1173,6 +1174,7 @@ static const struct cmd cmds[] = { { "loadall", do_loadall }, { "attach", do_attach }, { "detach", do_detach }, + { "tracelog", do_tracelog }, { 0 } }; |