[PATCH bpf-next 2/6] tools: bpftool: add --log-all option to print all possible log info

[Quentin Monnet <quentin.monnet@xxxxxxxxxxxxx>]

The --log-all option is a shortcut for "--log-libbpf warn,info,debug".
It tells bpftool to print all possible logs from libbpf, and may be
extended in the future to set other log levels from other components as
well.

This option has a short name: "-l".

Signed-off-by: Quentin Monnet <quentin.monnet@xxxxxxxxxxxxx>
Reviewed-by: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
---
 tools/bpf/bpftool/Documentation/bpftool-prog.rst | 4 ++++
 tools/bpf/bpftool/bash-completion/bpftool        | 3 ++-
 tools/bpf/bpftool/main.c                         | 7 ++++++-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 77d9570488d1..0525275f79f1 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -180,6 +180,10 @@ OPTIONS
 		  levels of information to print, which can be **warn**,
 		  **info** or **debug**. The default is **warn,info**.
 
+	-l, --log-all
+		  Print all possible log information. This is a shortcut for
+		  **--log-libbpf warn,info,debug**.
+
 EXAMPLES
 ========
 **# bpftool prog show**
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
index a232da1b158d..f4ad75c6b243 100644
--- a/tools/bpf/bpftool/bash-completion/bpftool
+++ b/tools/bpf/bpftool/bash-completion/bpftool
@@ -209,7 +209,8 @@ _bpftool()
 
     # Deal with options
     if [[ ${words[cword]} == -* ]]; then
-        local c='--version --json --pretty --bpffs --mapcompat --log-libbpf'
+        local c='--version --json --pretty --bpffs --mapcompat \
+            --log-libbpf --log-all'
         COMPREPLY=( $( compgen -W "$c" -- "$cur" ) )
         return 0
     fi
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index 6318be6feb5c..417cff76c7a1 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -360,6 +360,7 @@ int main(int argc, char **argv)
 		{ "mapcompat",	no_argument,		NULL,	'm' },
 		{ "nomount",	no_argument,		NULL,	'n' },
 		{ "log-libbpf",	required_argument,	NULL,	'd' },
+		{ "log-all",	no_argument,		NULL,	'l' },
 		{ 0 }
 	};
 	int opt, ret;
@@ -375,7 +376,7 @@ int main(int argc, char **argv)
 	hash_init(map_table.table);
 
 	opterr = 0;
-	while ((opt = getopt_long(argc, argv, "Vhpjfmn",
+	while ((opt = getopt_long(argc, argv, "Vhpjfmnl",
 				  options, NULL)) >= 0) {
 		switch (opt) {
 		case 'V':
@@ -409,6 +410,10 @@ int main(int argc, char **argv)
 			if (set_libbpf_loglevel(optarg))
 				return -1;
 			break;
+		case 'l':
+			if (set_libbpf_loglevel("warn,info,debug"))
+				return -1;
+			break;
 		default:
 			p_err("unrecognized option '%s'", argv[optind - 1]);
 			if (json_output)
-- 
2.17.1