[PATCH v1 01/11] io_uring: support CQE32 in io_uring_cqe

Stefan Roesch
2022-04-19T20:56:49Z

This adds the struct io_uring_cqe_extra in the structure io_uring_cqe to
support large CQE's.

Co-developed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Stefan Roesch <shr@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
include/uapi/linux/io_uring.h | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index ee677dbd6a6d..6f9f9b6a9d15 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -111,6 +111,7 @@ enum {
#define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */
#define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */
#define IORING_SETUP_SQE128 (1U << 8) /* SQEs are 128b */
+#define IORING_SETUP_CQE32 (1U << 9) /* CQEs are 32b */

enum {
IORING_OP_NOP,
@@ -201,6 +202,11 @@ enum {
#define IORING_POLL_UPDATE_EVENTS (1U << 1)
#define IORING_POLL_UPDATE_USER_DATA (1U << 2)

+struct io_uring_cqe_extra {
+ __u64 extra1;
+ __u64 extra2;
+};
+
/*
* IO completion data structure (Completion Queue Entry)
*/
@@ -208,6 +214,12 @@ struct io_uring_cqe {
__u64 user_data; /* sqe->data submission passed back */
__s32 res; /* result code for this event */
__u32 flags;
+
+ /*
+ * If the ring is initialized with IORING_SETUP_CQE32, then this field
+ * contains 16-bytes of padding, doubling the size of the CQE.
+ */
+ struct io_uring_cqe_extra b[0];
};

/*
--
2.30.2