From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: Yinjun Zhang <yinjun.zhang@corigine.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>
Subject: [PATCH bpf-next] bpftool: Fix pretty print dump for maps without BTF loaded
Date: Wed, 16 Feb 2022 10:21:02 +0100 [thread overview]
Message-ID: <20220216092102.125448-1-jolsa@kernel.org> (raw)
The commit e5043894b21f ("bpftool: Use libbpf_get_error() to check error")
fails to dump map without BTF loaded in pretty mode (-p option).
Fixing this by making sure get_map_kv_btf won't fail in case there's
no BTF available for the map.
Cc: Yinjun Zhang <yinjun.zhang@corigine.com>
Fixes: e5043894b21f ("bpftool: Use libbpf_get_error() to check error")
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/bpf/bpftool/map.c | 29 +++++++++++++----------------
1 file changed, 13 insertions(+), 16 deletions(-)
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index 7a341a472ea4..8562add7417d 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -805,29 +805,28 @@ static int maps_have_btf(int *fds, int nb_fds)
static struct btf *btf_vmlinux;
-static struct btf *get_map_kv_btf(const struct bpf_map_info *info)
+static int get_map_kv_btf(const struct bpf_map_info *info, struct btf **btf)
{
- struct btf *btf = NULL;
+ int err = 0;
if (info->btf_vmlinux_value_type_id) {
if (!btf_vmlinux) {
btf_vmlinux = libbpf_find_kernel_btf();
- if (libbpf_get_error(btf_vmlinux))
+ err = libbpf_get_error(btf_vmlinux);
+ if (err) {
p_err("failed to get kernel btf");
+ return err;
+ }
}
- return btf_vmlinux;
+ *btf = btf_vmlinux;
} else if (info->btf_value_type_id) {
- int err;
-
- btf = btf__load_from_kernel_by_id(info->btf_id);
- err = libbpf_get_error(btf);
- if (err) {
+ *btf = btf__load_from_kernel_by_id(info->btf_id);
+ err = libbpf_get_error(*btf);
+ if (err)
p_err("failed to get btf");
- btf = ERR_PTR(err);
- }
}
- return btf;
+ return err;
}
static void free_map_kv_btf(struct btf *btf)
@@ -862,8 +861,7 @@ map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr,
prev_key = NULL;
if (wtr) {
- btf = get_map_kv_btf(info);
- err = libbpf_get_error(btf);
+ err = get_map_kv_btf(info, &btf);
if (err) {
goto exit_free;
}
@@ -1054,8 +1052,7 @@ static void print_key_value(struct bpf_map_info *info, void *key,
json_writer_t *btf_wtr;
struct btf *btf;
- btf = get_map_kv_btf(info);
- if (libbpf_get_error(btf))
+ if (get_map_kv_btf(info, &btf))
return;
if (json_output) {
--
2.35.1
next reply other threads:[~2022-02-16 9:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-16 9:21 Jiri Olsa [this message]
2022-02-16 18:40 ` [PATCH bpf-next] bpftool: Fix pretty print dump for maps without BTF loaded patchwork-bot+netdevbpf
2022-02-16 23:08 ` Andrii Nakryiko
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