From 30da46b5dc3a9a14db11706d841440e28b12bb53 Mon Sep 17 00:00:00 2001 From: Quentin Monnet Date: Wed, 5 Dec 2018 10:28:24 +0000 Subject: 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 Suggested-by: Daniel Borkmann Signed-off-by: Quentin Monnet Reviewed-by: Jakub Kicinski Signed-off-by: Daniel Borkmann --- tools/bpf/bpftool/prog.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'tools/bpf/bpftool/prog.c') 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 } }; -- cgit v1.2.3