linux-kernel - [PATCH liburing v2 1/5] Add CQ ring 'flags' field

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Date:   Wed, 20 May 2020 19:07:10 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...r.kernel.org, io-uring@...r.kernel.org
Subject: [PATCH liburing v2 1/5] Add CQ ring 'flags' field

io_uring provides the new CQ ring 'flags' field if 'cq_off.flags'
is not zero. In this case we set the 'cq->kflags' pointer, otherwise
it will be NULL.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 src/include/liburing.h          | 1 +
 src/include/liburing/io_uring.h | 4 +++-
 src/setup.c                     | 2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/include/liburing.h b/src/include/liburing.h
index 4311325..adc8db9 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -41,6 +41,7 @@ struct io_uring_cq {
 	unsigned *ktail;
 	unsigned *kring_mask;
 	unsigned *kring_entries;
+	unsigned *kflags;
 	unsigned *koverflow;
 	struct io_uring_cqe *cqes;
 
diff --git a/src/include/liburing/io_uring.h b/src/include/liburing/io_uring.h
index a279151..9860a8a 100644
--- a/src/include/liburing/io_uring.h
+++ b/src/include/liburing/io_uring.h
@@ -205,7 +205,9 @@ struct io_cqring_offsets {
 	__u32 ring_entries;
 	__u32 overflow;
 	__u32 cqes;
-	__u64 resv[2];
+	__u32 flags;
+	__u32 resv1;
+	__u64 resv2;
 };
 
 /*
diff --git a/src/setup.c b/src/setup.c
index f783b6a..860c112 100644
--- a/src/setup.c
+++ b/src/setup.c
@@ -76,6 +76,8 @@ err:
 	cq->kring_entries = cq->ring_ptr + p->cq_off.ring_entries;
 	cq->koverflow = cq->ring_ptr + p->cq_off.overflow;
 	cq->cqes = cq->ring_ptr + p->cq_off.cqes;
+	if (p->cq_off.flags)
+		cq->kflags = cq->ring_ptr + p->cq_off.flags;
 	return 0;
 }
 
-- 
2.25.4