Subject: [PATCHv3 3/3] tools bpftool: Display license GPL compatible in prog show/list

From: Jiri Olsa <[email-masked]>
Date: Thu, 26 Apr 2018 10:18:01 +0200

On Thu, Apr 26, 2018 at 09:53:26AM +0200, Daniel Borkmann wrote:
> On 04/26/2018 09:39 AM, Jiri Olsa wrote:
> > On Wed, Apr 25, 2018 at 11:14:30PM +0200, Daniel Borkmann wrote:
> >> On 04/25/2018 11:03 PM, Jakub Kicinski wrote:
> >>> On Wed, 25 Apr 2018 19:41:08 +0200, Jiri Olsa wrote:
> >>>> @@ -295,6 +297,7 @@ static void print_prog_plain(struct bpf_prog_info *info, int fd)
> >>>>  	printf("tag ");
> >>>>  	fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
> >>>>  	print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
> >>>> +	printf(" license GPL %scompatible", info->gpl_compatible ? "" : "NON ");
> >>>
> >>> 3 nit picks:
> >>>
> >>> Other "fields" are separated by two spaces between each other:
> >>>
> >>>   4: kprobe  name func_begin  tag 57cd311f2e27366b license GPL compatible
> >>>            ^^               ^^                    X
> >>>           loaded_at Apr 25/11:20  uid 0
> >>>                                 ^^
> >>>           xlated 16B  not jited  memlock 4096B
> >>>                     ^^         ^^
> >>>
> >>> Could you also update the example outputs in the man page:
> >>>
> >>> tools/bpf/bpftool/Documentation/bpftool-prog.rst
> >>>
> >>> Sorry about the bike shedding but I would also vote for:
> >>>
> >>> "[not] GPL compatible"
> >>>
> >>> rather than
> >>>
> >>> "license GPL [NON] compatible"
> >>>
> >>> for brevity..
> >>
> >> While we're at it, can we also squeeze this whole thing a bit? Feels like
> >> huge string wasted for very little information compared to the rest of the
> >> dump. Just append the string "gpl" at the end of the line if info->gpl_compatible
> >> is set, otherwise just add nothing. This also allows to naturally grep
> >> for it e.g. `bpftool p | grep gpl` if you need a quick summary.
> > 
> > that's fine with me.. so 'gpl' in here:
> > 
> > 5: tracepoint  name func  tag 57cd311f2e27366b  gpl
> >         loaded_at Apr 26/09:37  uid 0
> >         xlated 16B  not jited  memlock 4096B
> > 
> > and keeping tyhe whole name in json output:
> > 
> > [{
> >         "id": 5,
> >         "type": "tracepoint",
> >         "name": "func",
> >         "tag": "57cd311f2e27366b",
> >         "gpl_compatible": true,
> >         "loaded_at": "Apr 26/09:37",
> >         "uid": 0,
> >         "bytes_xlated": 16,
> >         "jited": false,
> >         "bytes_memlock": 4096
> >     }
> > ]
> > 
> > how about that?
> 
> Sounds good, thanks Jiri!

v3 of the last patch attached, the branch is also updated

thanks,
jirka

---
Display the license "gpl" string in bpftool prog command, like:

  # bpftool prog list
  5: tracepoint  name func  tag 57cd311f2e27366b  gpl
          loaded_at Apr 26/09:37  uid 0
          xlated 16B  not jited  memlock 4096B

  # bpftool --json --pretty prog show
  [{
          "id": 5,
          "type": "tracepoint",
          "name": "func",
          "tag": "57cd311f2e27366b",
          "gpl_compatible": true,
          "loaded_at": "Apr 26/09:37",
          "uid": 0,
          "bytes_xlated": 16,
          "jited": false,
          "bytes_memlock": 4096
      }
  ]

Signed-off-by: Jiri Olsa <[email-masked]>
---
 tools/bpf/bpftool/Documentation/bpftool-prog.rst | 3 ++-
 tools/bpf/bpftool/prog.c                         | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 67ca6c69376c..43d34a5c3ec5 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -95,7 +95,7 @@ EXAMPLES
 **# bpftool prog show**
 ::
 
-  10: xdp  name some_prog  tag 005a3d2123620c8b
+  10: xdp  name some_prog  tag 005a3d2123620c8b  gpl
 	loaded_at Sep 29/20:11  uid 0
 	xlated 528B  jited 370B  memlock 4096B  map_ids 10
 
@@ -108,6 +108,7 @@ EXAMPLES
                 "id": 10,
                 "type": "xdp",
                 "tag": "005a3d2123620c8b",
+                "gpl_compatible": true,
                 "loaded_at": "Sep 29/20:11",
                 "uid": 0,
                 "bytes_xlated": 528,
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 548adb9b7317..e71a0a11afde 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -235,6 +235,8 @@ static void print_prog_json(struct bpf_prog_info *info, int fd)
 		     info->tag[0], info->tag[1], info->tag[2], info->tag[3],
 		     info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
 
+	jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible);
+
 	print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
 
 	if (info->load_time) {
@@ -295,6 +297,7 @@ static void print_prog_plain(struct bpf_prog_info *info, int fd)
 	printf("tag ");
 	fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
 	print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
+	printf("%s", info->gpl_compatible ? "  gpl" : "");
 	printf("\n");
 
 	if (info->load_time) {
-- 
2.13.6