[PATCH net-next 1/3] xsk: add atomic cached_prod for copy mode

[Jason Xing <kerneljasonxing@gmail.com>]

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