diff mbox series

[bpf-next,v7,2/5] bpf: Handle bpf_link_info for the parameterized task BPF iterators.

Message ID 20220826003712.2810158-3-kuifeng@fb.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Parameterize task iterators. | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/apply fail Patch does not apply to bpf-next
bpf/vmtest-bpf-next-PR success PR summary
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bpf/vmtest-bpf-next-VM_Test-4 success Logs for llvm-toolchain
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bpf/vmtest-bpf-next-VM_Test-10 success Logs for test_progs on x86_64 with gcc
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Commit Message

Kui-Feng Lee Aug. 26, 2022, 12:37 a.m. UTC 
Add new fields to bpf_link_info that users can query it through
bpf_obj_get_info_by_fd().

Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
---
 include/uapi/linux/bpf.h       |  4 ++++
 kernel/bpf/task_iter.c         | 18 ++++++++++++++++++
 tools/include/uapi/linux/bpf.h |  4 ++++
 3 files changed, 26 insertions(+)
diff mbox series

Patch

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 385deab984e1..173d11df822c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -6216,6 +6216,10 @@  struct bpf_link_info {
 					__u64 cgroup_id;
 					__u32 order;
 				} cgroup;
+				struct {
+					__u32 tid;
+					__u32 pid;
+				} task;
 			};
 		} iter;
 		struct  {
diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 1200cfde71e3..72c8747dff89 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -608,6 +608,21 @@  static const struct bpf_iter_seq_info task_seq_info = {
 	.seq_priv_size		= sizeof(struct bpf_iter_seq_task_info),
 };
 
+static int bpf_iter_fill_link_info(const struct bpf_iter_aux_info *aux, struct bpf_link_info *info)
+{
+	switch (aux->task.type) {
+	case BPF_TASK_ITER_TID:
+		info->iter.task.tid = aux->task.pid;
+		break;
+	case BPF_TASK_ITER_TGID:
+		info->iter.task.pid = aux->task.pid;
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
 static struct bpf_iter_reg task_reg_info = {
 	.target			= "task",
 	.attach_target		= bpf_iter_attach_task,
@@ -618,6 +633,7 @@  static struct bpf_iter_reg task_reg_info = {
 		  PTR_TO_BTF_ID_OR_NULL },
 	},
 	.seq_info		= &task_seq_info,
+	.fill_link_info		= bpf_iter_fill_link_info,
 };
 
 static const struct bpf_iter_seq_info task_file_seq_info = {
@@ -639,6 +655,7 @@  static struct bpf_iter_reg task_file_reg_info = {
 		  PTR_TO_BTF_ID_OR_NULL },
 	},
 	.seq_info		= &task_file_seq_info,
+	.fill_link_info		= bpf_iter_fill_link_info,
 };
 
 static const struct bpf_iter_seq_info task_vma_seq_info = {
@@ -660,6 +677,7 @@  static struct bpf_iter_reg task_vma_reg_info = {
 		  PTR_TO_BTF_ID_OR_NULL },
 	},
 	.seq_info		= &task_vma_seq_info,
+	.fill_link_info		= bpf_iter_fill_link_info,
 };
 
 BPF_CALL_5(bpf_find_vma, struct task_struct *, task, u64, start,
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index a54a1455333c..b0cc66332cc1 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -6216,6 +6216,10 @@  struct bpf_link_info {
 					__u64 cgroup_id;
 					__u32 order;
 				} cgroup;
+				struct {
+					__u32 tid;
+					__u32 pid;
+				} task;
 			};
 		} iter;
 		struct  {