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Date:   Wed, 26 Aug 2020 17:06:21 -0700
From:   Yonghong Song <yhs@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>
Subject: [PATCH bpf-next 3/5] bpf: add link_query support for newly added main_thread_only info

Added support for link_query for main_thread_only information
with task/task_file iterators.

Signed-off-by: Yonghong Song <yhs@...com>
---
 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

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