diff mbox series

[bpf-next,v10,2/5] bpf: Handle bpf_link_info for the parameterized task BPF iterators.

Message ID 20220831181039.2680134-3-kuifeng@fb.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Parameterize task iterators. | expand

Checks

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netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
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netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1697 this patch: 1697
netdev/cc_maintainers warning 7 maintainers not CCed: john.fastabend@gmail.com jolsa@kernel.org song@kernel.org haoluo@google.com martin.lau@linux.dev kpsingh@kernel.org sdf@google.com
netdev/build_clang success Errors and warnings before: 173 this patch: 173
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bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Kui-Feng Lee Aug. 31, 2022, 6:10 p.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 f212a19eda06..088cbc8f6a0c 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 df7bf867e28f..4cfcca1b7143 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -671,6 +671,21 @@  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,
@@ -681,6 +696,7 @@  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 = {
@@ -702,6 +718,7 @@  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 = {
@@ -723,6 +740,7 @@  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 40935278eede..864cf6a613d6 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  {