[PATCH 1/1] engines/io_uring: set coop taskrun, single issuer and defer taskrun

[Ankit Kumar <ankit.kumar@samsung.com>]

Add missing changes to io_uring_cmd I/O engine for COOP_TASKRUN
This was introduced for io_uring in commit 4d22c103

Add missing changes to io_uring_cmd I/O engine to set single issuer
and defer taskrun. This was introduced for io_uring in commit e453f369

Signed-off-by: Ankit Kumar <ankit.kumar@samsung.com>
---
 engines/io_uring.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/engines/io_uring.c b/engines/io_uring.c
index c679177f..6906e0a4 100644
--- a/engines/io_uring.c
+++ b/engines/io_uring.c
@@ -889,9 +889,30 @@ static int fio_ioring_cmd_queue_init(struct thread_data *td)
 	p.flags |= IORING_SETUP_CQSIZE;
 	p.cq_entries = depth;
 
+	/*
+	 * Setup COOP_TASKRUN as we don't need to get IPI interrupted for
+	 * completing IO operations.
+	 */
+	p.flags |= IORING_SETUP_COOP_TASKRUN;
+
+	/*
+	 * io_uring is always a single issuer, and we can defer task_work
+	 * runs until we reap events.
+	 */
+	p.flags |= IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN;
+
 retry:
 	ret = syscall(__NR_io_uring_setup, depth, &p);
 	if (ret < 0) {
+		if (errno == EINVAL && p.flags & IORING_SETUP_DEFER_TASKRUN) {
+			p.flags &= ~IORING_SETUP_DEFER_TASKRUN;
+			p.flags &= ~IORING_SETUP_SINGLE_ISSUER;
+			goto retry;
+		}
+		if (errno == EINVAL && p.flags & IORING_SETUP_COOP_TASKRUN) {
+			p.flags &= ~IORING_SETUP_COOP_TASKRUN;
+			goto retry;
+		}
 		if (errno == EINVAL && p.flags & IORING_SETUP_CQSIZE) {
 			p.flags &= ~IORING_SETUP_CQSIZE;
 			goto retry;
-- 
2.17.1