On 7/9/25 5:07 AM, Tao Chen wrote:
Attach_type will be set when link created from user, it is better
to record attach_type in bpf_link directly suggested by Andrii. So
add the attach_type field in bpf_link and move the sleepable field to
the end just to fill the byte hole.
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Tao Chen <chen.dylane@xxxxxxxxx>
---
drivers/net/netkit.c | 2 +-
include/linux/bpf.h | 28 ++++++++++++++++-----------
kernel/bpf/bpf_iter.c | 3 ++-
kernel/bpf/bpf_struct_ops.c | 5 +++--
kernel/bpf/cgroup.c | 4 ++--
kernel/bpf/net_namespace.c | 2 +-
kernel/bpf/syscall.c | 35 +++++++++++++++++++++-------------
kernel/bpf/tcx.c | 3 ++-
kernel/bpf/trampoline.c | 10 ++++++----
kernel/trace/bpf_trace.c | 4 ++--
net/bpf/bpf_dummy_struct_ops.c | 3 ++-
net/core/dev.c | 3 ++-
net/core/sock_map.c | 3 ++-
net/netfilter/nf_bpf_link.c | 3 ++-
14 files changed, 66 insertions(+), 42 deletions(-)
[...]
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 34dd90ec7fa..dd5070039de 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1729,12 +1729,10 @@ struct bpf_link {
enum bpf_link_type type;
const struct bpf_link_ops *ops;
struct bpf_prog *prog;
- /* whether BPF link itself has "sleepable" semantics, which can differ
- * from underlying BPF program having a "sleepable" semantics, as BPF
- * link's semantics is determined by target attach hook
- */
- bool sleepable;
+
u32 flags;
+ enum bpf_attach_type attach_type;
+
/* rcu is used before freeing, work can be used to schedule that
* RCU-based freeing before that, so they never overlap
*/
@@ -1742,6 +1740,11 @@ struct bpf_link {
struct rcu_head rcu;
struct work_struct work;
};
+ /* whether BPF link itself has "sleepable" semantics, which can differ
+ * from underlying BPF program having a "sleepable" semantics, as BPF
+ * link's semantics is determined by target attach hook
+ */
+ bool sleepable;
};
lgtm, it looks a bit weird at the end here after rcu/work but in future if other
attributes get added to the link obj and a new hole frees up we can move it up
again. Definitely good the rationale for the move is documented in the commit msg.
Acked-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
