[PATCH 2/8] io_uring: add UAPI definitions for mixed CQE postings

[Jens Axboe <axboe@kernel.dk>]

This adds the CQE flags related to supporting a mixed CQ ring mode, where
both normal (16b) and big (32b) CQEs may be posted.

No functional changes in this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 include/uapi/linux/io_uring.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 6957dc539d83..69337eb1db33 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -487,12 +487,22 @@ struct io_uring_cqe {
  *			other provided buffer type, all completions with a
  *			buffer passed back is automatically returned to the
  *			application.
+ * IORING_CQE_F_SKIP	If set, then the application/liburing must ignore this
+ *			CQE. It's only purpose is to fill a gap in the ring,
+ *			if a large CQE is attempted posted when the ring has
+ *			just a single small CQE worth of space left before
+ *			wrapping.
+ * IORING_CQE_F_32	If set, this is a 32b/big-cqe posting. Use with rings
+ *			setup in a mixed CQE mode, where both 16b and 32b
+ *			CQEs may be posted to the CQ ring.
  */
 #define IORING_CQE_F_BUFFER		(1U << 0)
 #define IORING_CQE_F_MORE		(1U << 1)
 #define IORING_CQE_F_SOCK_NONEMPTY	(1U << 2)
 #define IORING_CQE_F_NOTIF		(1U << 3)
 #define IORING_CQE_F_BUF_MORE		(1U << 4)
+#define IORING_CQE_F_SKIP		(1U << 5)
+#define IORING_CQE_F_32			(1U << 15)
 
 #define IORING_CQE_BUFFER_SHIFT		16
 
-- 
2.50.1