From: Hou Tao <houtao1@xxxxxxxxxx>
For bpf map with dynptr key support, the userspace application will use
bpf_dynptr_user to represent the bpf_dynptr in the map key and pass it
to bpf syscall. The bpf syscall will copy from bpf_dynptr_user to
construct a corresponding bpf_dynptr_kern object when the map key is an
input argument, and copy to bpf_dynptr_user from a bpf_dynptr_kern
object when the map key is an output argument.
For now the size of bpf_dynptr_user must be the same as bpf_dynptr, but
the last u32 field is not used, so make it a reserved field.
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
include/uapi/linux/bpf.h | 6 ++++++
tools/include/uapi/linux/bpf.h | 6 ++++++
2 files changed, 12 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 2acf9b3363717..7d96685513c55 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7335,6 +7335,12 @@ struct bpf_dynptr {
__u64 __opaque[2];
} __attribute__((aligned(8)));
+struct bpf_dynptr_user {
+ __bpf_md_ptr(void *, data);
+ __u32 size;
+ __u32 reserved;
+} __attribute__((aligned(8)));
+
struct bpf_list_head {
__u64 __opaque[2];
} __attribute__((aligned(8)));
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 2acf9b3363717..7d96685513c55 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -7335,6 +7335,12 @@ struct bpf_dynptr {
__u64 __opaque[2];
} __attribute__((aligned(8)));
+struct bpf_dynptr_user {
+ __bpf_md_ptr(void *, data);
+ __u32 size;
+ __u32 reserved;
+} __attribute__((aligned(8)));
+
struct bpf_list_head {
__u64 __opaque[2];
} __attribute__((aligned(8)));
--
2.29.2
