[PATCH net-next v3 1/3] xsk: add atomic cached_prod for copy mode
From: Jason Xing <hidden>
Date: 2025-11-28 13:46:14
Also in:
bpf
Subsystem:
networking [general], the rest, xdp sockets (af_xdp) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Magnus Karlsson, Maciej Fijalkowski
From: Jason Xing <kernelxing@tencent.com> Add a union member for completion queue only in copy mode for now. The purpose is to replace the cq_cached_prod_lock with atomic operation to improve performance. Note that completion queue in zerocopy mode doesn't need to be converted because the whole process is lockless. Signed-off-by: Jason Xing <kernelxing@tencent.com> --- net/xdp/xsk_queue.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index 1eb8d9f8b104..44cc01555c0b 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h@@ -40,7 +40,11 @@ struct xdp_umem_ring { struct xsk_queue { u32 ring_mask; u32 nentries; - u32 cached_prod; + union { + u32 cached_prod; + /* Used for cq in copy mode only */ + atomic_t cached_prod_atomic; + }; u32 cached_cons; struct xdp_ring *ring; u64 invalid_descs;
--
2.41.3