From: Yafang Shao <laoar.shao@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, quentin@isovalent.com
Cc: bpf@vger.kernel.org, Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH bpf-next 6/6] bpftool: Show probed function in perf_event link info
Date: Fri, 2 Jun 2023 08:52:39 +0000 [thread overview]
Message-ID: <20230602085239.91138-7-laoar.shao@gmail.com> (raw)
In-Reply-To: <20230602085239.91138-1-laoar.shao@gmail.com>
Show the exposed perf_event link info in bpftool. The result as follows,
$ bpftool link show
1: perf_event prog 5
func kernel_clone addr ffffffffb40bc310 offset 0
bpf_cookie 0
pids trace(9726)
$ bpftool link show -j
[{"id":1,"type":"perf_event","prog_id":5,"func":"kernel_clone","addr":18446744072435254032,"offset":0,"bpf_cookie":0,"pids":[{"pid":9726,"comm":"trace"}]}]
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
tools/bpf/bpftool/link.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c
index 3b00c07..045f59f 100644
--- a/tools/bpf/bpftool/link.c
+++ b/tools/bpf/bpftool/link.c
@@ -280,6 +280,12 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
kernel_syms_show(addrs, info->kprobe_multi.count, 0);
jsonw_end_array(json_wtr);
break;
+ case BPF_LINK_TYPE_PERF_EVENT:
+ jsonw_string_field(json_wtr, "func",
+ u64_to_ptr(info->perf_event.name));
+ jsonw_uint_field(json_wtr, "addr", info->perf_event.addr);
+ jsonw_uint_field(json_wtr, "offset", info->perf_event.offset);
+ break;
default:
break;
}
@@ -416,7 +422,7 @@ void netfilter_dump_plain(const struct bpf_link_info *info)
static int show_link_close_plain(int fd, struct bpf_link_info *info)
{
struct bpf_prog_info prog_info;
- const char *prog_type_str;
+ const char *prog_type_str, *buf;
int err;
show_link_header_plain(info);
@@ -472,6 +478,12 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
addrs = (const __u64 *)u64_to_ptr(info->kprobe_multi.addrs);
kernel_syms_show(addrs, cnt, indent);
break;
+ case BPF_LINK_TYPE_PERF_EVENT:
+ buf = (const char *)u64_to_ptr(info->perf_event.name);
+ if (buf[0] != '\0' || info->perf_event.addr)
+ printf("\n\tfunc %s addr %llx offset %d ", buf,
+ info->perf_event.addr, info->perf_event.offset);
+ break;
default:
break;
}
@@ -498,6 +510,7 @@ static int do_show_link(int fd)
int count;
int err;
+ buf[0] = '\0';
memset(&info, 0, sizeof(info));
again:
err = bpf_link_get_info_by_fd(fd, &info, &len);
@@ -533,6 +546,12 @@ static int do_show_link(int fd)
goto again;
}
}
+ if (info.type == BPF_LINK_TYPE_PERF_EVENT &&
+ !info.perf_event.name) {
+ info.perf_event.name = (unsigned long)&buf;
+ info.perf_event.name_len = sizeof(buf);
+ goto again;
+ }
if (json_output)
show_link_close_json(fd, &info);
--
1.8.3.1
next prev parent reply other threads:[~2023-06-02 8:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-02 8:52 [PATCH bpf-next 0/6] bpf: Support ->fill_link_info for kprobe prog Yafang Shao
2023-06-02 8:52 ` [PATCH bpf-next 1/6] bpf: Support ->fill_link_info for kprobe_multi Yafang Shao
2023-06-02 16:45 ` Stanislav Fomichev
2023-06-04 3:21 ` Yafang Shao
2023-06-03 6:38 ` kernel test robot
2023-06-04 3:22 ` Yafang Shao
2023-06-02 8:52 ` [PATCH bpf-next 2/6] bpftool: Show probed function in kprobe_multi link info Yafang Shao
2023-06-02 20:36 ` Alexei Starovoitov
2023-06-04 3:24 ` Yafang Shao
2023-06-02 22:16 ` Andrii Nakryiko
2023-06-04 3:26 ` Yafang Shao
2023-06-02 8:52 ` [PATCH bpf-next 3/6] bpf: Always expose the probed address Yafang Shao
2023-06-02 8:52 ` [PATCH bpf-next 4/6] bpf: Add a common helper bpf_copy_to_user() Yafang Shao
2023-06-02 8:52 ` [PATCH bpf-next 5/6] bpf: Support ->fill_link_info for perf_event Yafang Shao
2023-06-02 22:19 ` Andrii Nakryiko
2023-06-04 3:28 ` Yafang Shao
2023-06-02 8:52 ` Yafang Shao [this message]
2023-06-02 20:38 ` [PATCH bpf-next 6/6] bpftool: Show probed function in perf_event link info Alexei Starovoitov
2023-06-04 3:23 ` Yafang Shao
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