Added support for link_query for main_thread_only information
with task/task_file iterators.
Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
include/uapi/linux/bpf.h | 5 +++++
kernel/bpf/task_iter.c | 17 +++++++++++++++++
tools/include/uapi/linux/bpf.h | 5 +++++
3 files changed, 27 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index af5c600bf673..595bdc4c9431 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -4259,6 +4259,11 @@ struct bpf_link_info {
struct {
__u32 map_id;
} map;
+
+ struct {
+ __u32 main_thread_only:1;
+ __u32 :31;
+ } task;
};
} iter;
struct {
diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 362bf2dda63a..7636abe05f27 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -329,6 +329,19 @@ static int bpf_iter_attach_task(struct bpf_prog *prog,
return 0;
}
+static void bpf_iter_task_show_fdinfo(const struct bpf_iter_aux_info *aux,
+ struct seq_file *seq)
+{
+ seq_printf(seq, "main_thread_only:\t%u\n", aux->main_thread_only);
+}
+
+static int bpf_iter_task_fill_link_info(const struct bpf_iter_aux_info *aux,
+ struct bpf_link_info *info)
+{
+ info->iter.task.main_thread_only = aux->main_thread_only;
+ return 0;
+}
+
BTF_ID_LIST(btf_task_file_ids)
BTF_ID(struct, task_struct)
BTF_ID(struct, file)
@@ -343,6 +356,8 @@ static const struct bpf_iter_seq_info task_seq_info = {
static struct bpf_iter_reg task_reg_info = {
.target = "task",
.attach_target = bpf_iter_attach_task,
+ .show_fdinfo = bpf_iter_task_show_fdinfo,
+ .fill_link_info = bpf_iter_task_fill_link_info,
.ctx_arg_info_size = 1,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__task, task),
@@ -361,6 +376,8 @@ static const struct bpf_iter_seq_info task_file_seq_info = {
static struct bpf_iter_reg task_file_reg_info = {
.target = "task_file",
.attach_target = bpf_iter_attach_task,
+ .show_fdinfo = bpf_iter_task_show_fdinfo,
+ .fill_link_info = bpf_iter_task_fill_link_info,
.ctx_arg_info_size = 2,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__task_file, task),
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index af5c600bf673..595bdc4c9431 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -4259,6 +4259,11 @@ struct bpf_link_info {
struct {
__u32 map_id;
} map;
+
+ struct {
+ __u32 main_thread_only:1;
+ __u32 :31;
+ } task;
};
} iter;
struct {
--
2.24.1
