From: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
This asks the kernel to setup a ring with 128-byte SQE and
32-byte CQE entries. It may fail with -EINVAL if the kernel
doesn't support this feature. If the kernel does support this
feature, then the ring will support big-sqe/big-cqe entries
which some commands may require.
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
---
os/linux/io_uring.h | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/os/linux/io_uring.h b/os/linux/io_uring.h
index 42b2fe84..2fa66135 100644
--- a/os/linux/io_uring.h
+++ b/os/linux/io_uring.h
@@ -60,7 +60,17 @@ struct io_uring_sqe {
__s32 splice_fd_in;
__u32 file_index;
};
- __u64 __pad2[2];
+ union {
+ struct {
+ __u64 addr3;
+ __u64 __pad2[1];
+ };
+ /*
+ * If the ring is initialized with IORING_SETUP_SQE128, then
+ * this field is used for 80 bytes of arbitrary command data
+ */
+ __u8 cmd[0];
+ };
};
enum {
@@ -101,6 +111,24 @@ enum {
#define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */
#define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */
#define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */
+#define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */
+/*
+ * Cooperative task running. When requests complete, they often require
+ * forcing the submitter to transition to the kernel to complete. If this
+ * flag is set, work will be done when the task transitions anyway, rather
+ * than force an inter-processor interrupt reschedule. This avoids interrupting
+ * a task running in userspace, and saves an IPI.
+ */
+#define IORING_SETUP_COOP_TASKRUN (1U << 8)
+/*
+ * If COOP_TASKRUN is set, get notified if task work is available for
+ * running and a kernel transition would be needed to run it. This sets
+ * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
+ */
+#define IORING_SETUP_TASKRUN_FLAG (1U << 9)
+
+#define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */
+#define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */
enum {
IORING_OP_NOP,
@@ -192,6 +220,12 @@ 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.
+ */
+ __u64 big_cqe[];
};
/*
--
2.17.1
