From: Yafang Shao <laoar.shao@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
yhs@fb.com, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, quentin@isovalent.com,
rostedt@goodmis.org, mhiramat@kernel.org
Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH v3 bpf-next 03/10] bpftool: Show probed function in kprobe_multi link info
Date: Mon, 12 Jun 2023 15:16:01 +0000 [thread overview]
Message-ID: <20230612151608.99661-4-laoar.shao@gmail.com> (raw)
In-Reply-To: <20230612151608.99661-1-laoar.shao@gmail.com>
Show the already expose kprobe_multi link info in bpftool. The result as
follows,
52: kprobe_multi prog 381
retprobe 0 func_cnt 7
addrs ffffffff9ec44f20 funcs schedule_timeout_interruptible
ffffffff9ec44f60 schedule_timeout_killable
ffffffff9ec44fa0 schedule_timeout_uninterruptible
ffffffff9ec44fe0 schedule_timeout_idle
ffffffffc09468d0 xfs_trans_get_efd [xfs]
ffffffffc0953a10 xfs_trans_get_buf_map [xfs]
ffffffffc0957320 xfs_trans_get_dqtrx [xfs]
pids kprobe_multi(559862)
53: kprobe_multi prog 381
retprobe 1 func_cnt 7
addrs ffffffff9ec44f20 funcs schedule_timeout_interruptible
ffffffff9ec44f60 schedule_timeout_killable
ffffffff9ec44fa0 schedule_timeout_uninterruptible
ffffffff9ec44fe0 schedule_timeout_idle
ffffffffc09468d0 xfs_trans_get_efd [xfs]
ffffffffc0953a10 xfs_trans_get_buf_map [xfs]
ffffffffc0957320 xfs_trans_get_dqtrx [xfs]
pids kprobe_multi(559862)
$ tools/bpf/bpftool/bpftool link show -j
[{"id":52,"type":"kprobe_multi","prog_id":381,"retprobe":0,"func_cnt":7,"funcs":[{"addr":18446744072078249760,"func":"schedule_timeout_interruptible","module":""},{"addr":18446744072078249824,"func":"schedule_timeout_killable","module":""},{"addr":18446744072078249888,"func":"schedule_timeout_uninterruptible","module":""},{"addr":18446744072078249952,"func":"schedule_timeout_idle","module":""},{"addr":18446744072645535952,"func":"xfs_trans_get_efd","module":"[xfs]"},{"addr":18446744072645589520,"func":"xfs_trans_get_buf_map","module":"[xfs]"},{"addr":18446744072645604128,"func":"xfs_trans_get_dqtrx","module":"[xfs]"}],"pids":[{"pid":559862,"comm":"kprobe_multi"}]},{"id":53,"type":"kprobe_multi","prog_id":381,"retprobe":1,"func_cnt":7,"funcs":[{"addr":18446744072078249760,"func":"schedule_timeout_interruptible","module":""},{"addr":18446744072078249824,"func":"schedule_timeout_killable","module":""},{"addr":18446744072078249888,"func":"schedule_timeout_uninterruptible","module":""},{"addr":18446744072078249952,"func":"schedule_timeout_idle","module":""},{"addr":18446744072645535952,"func":"xfs_trans_get_efd","module":"[xfs]"},{"addr":18446744072645589520,"func":"xfs_trans_get_buf_map","module":"[xfs]"},{"addr":18446744072645604128,"func":"xfs_trans_get_dqtrx","module":"[xfs]"}],"pids":[{"pid":559862,"comm":"kprobe_multi"}]}]
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
tools/bpf/bpftool/link.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 108 insertions(+), 1 deletion(-)
diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c
index 2d78607..0015582 100644
--- a/tools/bpf/bpftool/link.c
+++ b/tools/bpf/bpftool/link.c
@@ -14,8 +14,10 @@
#include "json_writer.h"
#include "main.h"
+#include "xlated_dumper.h"
static struct hashmap *link_table;
+static struct dump_data dd = {};
static int link_parse_fd(int *argc, char ***argv)
{
@@ -166,6 +168,45 @@ static int get_prog_info(int prog_id, struct bpf_prog_info *info)
return err;
}
+static int cmp_u64(const void *A, const void *B)
+{
+ const __u64 *a = A, *b = B;
+
+ return *a - *b;
+}
+
+static void
+show_kprobe_multi_json(struct bpf_link_info *info, json_writer_t *wtr)
+{
+ __u32 i, j = 0;
+ __u64 *addrs;
+
+ jsonw_uint_field(json_wtr, "retprobe",
+ info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN);
+ jsonw_uint_field(json_wtr, "func_cnt", info->kprobe_multi.count);
+ jsonw_name(json_wtr, "funcs");
+ jsonw_start_array(json_wtr);
+ addrs = (__u64 *)u64_to_ptr(info->kprobe_multi.addrs);
+ qsort((void *)addrs, info->kprobe_multi.count, sizeof(__u64), cmp_u64);
+
+ /* Load it once for all. */
+ if (!dd.sym_count)
+ kernel_syms_load(&dd);
+ for (i = 0; i < dd.sym_count; i++) {
+ if (dd.sym_mapping[i].address != addrs[j])
+ continue;
+ jsonw_start_object(json_wtr);
+ jsonw_uint_field(json_wtr, "addr", dd.sym_mapping[i].address);
+ jsonw_string_field(json_wtr, "func", dd.sym_mapping[i].name);
+ /* Print none if it is vmlinux */
+ jsonw_string_field(json_wtr, "module", dd.sym_mapping[i].module);
+ jsonw_end_object(json_wtr);
+ if (j++ == info->kprobe_multi.count)
+ break;
+ }
+ jsonw_end_array(json_wtr);
+}
+
static int show_link_close_json(int fd, struct bpf_link_info *info)
{
struct bpf_prog_info prog_info;
@@ -218,6 +259,9 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
jsonw_uint_field(json_wtr, "map_id",
info->struct_ops.map_id);
break;
+ case BPF_LINK_TYPE_KPROBE_MULTI:
+ show_kprobe_multi_json(info, json_wtr);
+ break;
default:
break;
}
@@ -351,6 +395,44 @@ void netfilter_dump_plain(const struct bpf_link_info *info)
printf(" flags 0x%x", info->netfilter.flags);
}
+static void show_kprobe_multi_plain(struct bpf_link_info *info)
+{
+ __u32 i, j = 0;
+ __u64 *addrs;
+
+ if (!info->kprobe_multi.count)
+ return;
+
+ printf("\n\tretprobe %d func_cnt %u ",
+ info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN,
+ info->kprobe_multi.count);
+ addrs = (__u64 *)u64_to_ptr(info->kprobe_multi.addrs);
+ qsort((void *)addrs, info->kprobe_multi.count, sizeof(__u64), cmp_u64);
+
+ /* Load it once for all. */
+ if (!dd.sym_count)
+ kernel_syms_load(&dd);
+ for (i = 0; i < dd.sym_count; i++) {
+ if (dd.sym_mapping[i].address != addrs[j])
+ continue;
+ if (!j)
+ printf("\n\taddrs %016lx funcs %s",
+ dd.sym_mapping[i].address,
+ dd.sym_mapping[i].name);
+ else
+ printf("\n\t %016lx %s",
+ dd.sym_mapping[i].address,
+ dd.sym_mapping[i].name);
+ if (dd.sym_mapping[i].module[0] != '\0')
+ printf(" %s ", dd.sym_mapping[i].module);
+ else
+ printf(" ");
+
+ if (j++ == info->kprobe_multi.count)
+ break;
+ }
+}
+
static int show_link_close_plain(int fd, struct bpf_link_info *info)
{
struct bpf_prog_info prog_info;
@@ -396,6 +478,9 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
case BPF_LINK_TYPE_NETFILTER:
netfilter_dump_plain(info);
break;
+ case BPF_LINK_TYPE_KPROBE_MULTI:
+ show_kprobe_multi_plain(info);
+ break;
default:
break;
}
@@ -417,7 +502,9 @@ static int do_show_link(int fd)
{
struct bpf_link_info info;
__u32 len = sizeof(info);
+ __u64 *addrs = NULL;
char buf[256];
+ int count;
int err;
memset(&info, 0, sizeof(info));
@@ -441,12 +528,28 @@ static int do_show_link(int fd)
info.iter.target_name_len = sizeof(buf);
goto again;
}
+ if (info.type == BPF_LINK_TYPE_KPROBE_MULTI &&
+ !info.kprobe_multi.addrs) {
+ count = info.kprobe_multi.count;
+ if (count) {
+ addrs = calloc(count, sizeof(__u64));
+ if (!addrs) {
+ p_err("mem alloc failed");
+ close(fd);
+ return -1;
+ }
+ info.kprobe_multi.addrs = (unsigned long)addrs;
+ goto again;
+ }
+ }
if (json_output)
show_link_close_json(fd, &info);
else
show_link_close_plain(fd, &info);
+ if (addrs)
+ free(addrs);
close(fd);
return 0;
}
@@ -471,7 +574,8 @@ static int do_show(int argc, char **argv)
fd = link_parse_fd(&argc, &argv);
if (fd < 0)
return fd;
- return do_show_link(fd);
+ do_show_link(fd);
+ goto out;
}
if (argc)
@@ -510,6 +614,9 @@ static int do_show(int argc, char **argv)
if (show_pinned)
delete_pinned_obj_table(link_table);
+out:
+ if (dd.sym_count)
+ kernel_syms_destroy(&dd);
return errno == ENOENT ? 0 : -1;
}
--
1.8.3.1
next prev parent reply other threads:[~2023-06-12 15:16 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 15:15 [PATCH v3 bpf-next 00/10] bpf: Support ->fill_link_info for kprobe_multi and perf_event links Yafang Shao
2023-06-12 15:15 ` [PATCH v3 bpf-next 01/10] bpf: Support ->fill_link_info for kprobe_multi Yafang Shao
2023-06-15 8:29 ` Jiri Olsa
2023-06-15 12:09 ` Yafang Shao
2023-06-16 17:24 ` Andrii Nakryiko
2023-06-17 2:48 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 02/10] bpftool: Dump the kernel symbol's module name Yafang Shao
2023-06-13 13:41 ` Quentin Monnet
2023-06-13 14:56 ` Yafang Shao
2023-06-16 17:25 ` Andrii Nakryiko
2023-06-17 2:55 ` Yafang Shao
2023-06-12 15:16 ` Yafang Shao [this message]
2023-06-13 13:41 ` [PATCH v3 bpf-next 03/10] bpftool: Show probed function in kprobe_multi link info Quentin Monnet
2023-06-13 14:59 ` Yafang Shao
2023-06-13 22:36 ` Kui-Feng Lee
2023-06-14 2:42 ` Yafang Shao
2023-06-14 8:33 ` Quentin Monnet
2023-06-16 17:30 ` Andrii Nakryiko
2023-06-17 3:08 ` Yafang Shao
2023-06-20 17:17 ` Andrii Nakryiko
2023-06-21 1:29 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 04/10] bpf: Protect probed address based on kptr_restrict setting Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 05/10] bpf: Clear the probe_addr for uprobe Yafang Shao
2023-06-12 17:22 ` Yonghong Song
2023-06-12 15:16 ` [PATCH v3 bpf-next 06/10] bpf: Expose symbol's respective address Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 07/10] bpf: Add a common helper bpf_copy_to_user() Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 08/10] bpf: Support ->fill_link_info for perf_event Yafang Shao
2023-06-12 17:36 ` Yonghong Song
2023-06-13 2:47 ` Yafang Shao
2023-06-14 2:34 ` Kui-Feng Lee
2023-06-14 2:45 ` Yafang Shao
2023-06-16 20:36 ` Andrii Nakryiko
2023-06-17 3:13 ` Yafang Shao
2023-06-15 10:21 ` Jiri Olsa
2023-06-15 12:10 ` Yafang Shao
2023-06-12 15:16 ` [PATCH v3 bpf-next 09/10] bpftool: Add perf event names Yafang Shao
2023-06-13 13:41 ` Quentin Monnet
2023-06-13 15:01 ` Yafang Shao
2023-06-15 10:23 ` Jiri Olsa
2023-06-12 15:16 ` [PATCH v3 bpf-next 10/10] bpftool: Show probed function in perf_event link info Yafang Shao
2023-06-13 13:42 ` Quentin Monnet
2023-06-13 15:11 ` Yafang Shao
2023-06-16 20:41 ` Andrii Nakryiko
2023-06-17 3:20 ` Yafang Shao
2023-06-17 3:29 ` Yafang Shao
2023-06-15 10:04 ` [PATCH v3 bpf-next 00/10] bpf: Support ->fill_link_info for kprobe_multi and perf_event links Jiri Olsa
2023-06-15 12:09 ` Yafang Shao
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