netdev - [PATCH bpf-next] tools/bpftool: show btf id in program information

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Date:   Wed, 10 Apr 2019 13:56:42 +0900
From:   Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        netdev@...r.kernel.org
Subject: [PATCH bpf-next] tools/bpftool: show btf id in program information

Let's add a way to know whether a program has btf context.
Patch adds 'btf_id' in the output of program listing.
When btf_id is present, it means program has btf context.

Sample output:
user@...t# bpftool prog list
25: xdp  name xdp_prog1  tag 539ec6ce11b52f98  gpl
	loaded_at 2019-04-10T11:44:20+0900  uid 0
	xlated 488B  not jited  memlock 4096B  map_ids 23
	btf_id 1

Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
---
 tools/bpf/bpftool/prog.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index d2be5a06c339..81067803189e 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -249,6 +249,9 @@ static void print_prog_json(struct bpf_prog_info *info, int fd)
 	if (info->nr_map_ids)
 		show_prog_maps(fd, info->nr_map_ids);
 
+	if (info->btf_id)
+		jsonw_int_field(json_wtr, "btf_id", info->btf_id);
+
 	if (!hash_empty(prog_table.table)) {
 		struct pinned_obj *obj;
 
@@ -319,6 +322,9 @@ static void print_prog_plain(struct bpf_prog_info *info, int fd)
 		}
 	}
 
+	if (info->btf_id)
+		printf("\n\tbtf_id %d\n", info->btf_id);
+
 	printf("\n");
 }
 
-- 
2.17.2