linux-kernel - [RFC PATCH 02/16] virtio_ring: split: introduce vring_virtqueue_detach

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Message-Id: <20220424024044.94749-3-xuanzhuo@linux.alibaba.com>
Date:   Sun, 24 Apr 2022 10:40:30 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: [RFC PATCH 02/16] virtio_ring: split: introduce vring_virtqueue_detach_split()

The function vring_virtqueue_detach_split() is introduced to detach the
vring of the current vq.

num_left records how many buffers there are, which can be used to check
the recovery of buffers completed.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 0a2c58557027..f3ad9322b512 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -112,6 +112,8 @@ struct vring_virtqueue_split {
 	 */
 	u32 vring_align;
 	bool may_reduce_num;
+
+	u32 num_left;
 };
 
 struct vring_virtqueue_packed {
@@ -982,6 +984,21 @@ static void virtqueue_reinit_split(struct vring_virtqueue *vq)
 	virtqueue_vring_init_split(vq);
 }
 
+static void virtqueue_vring_detach_split(struct vring_virtqueue *vq,
+					 struct vring_virtqueue_split *vring)
+{
+	vring->vring = vq->split.vring;
+
+	vring->queue_dma_addr = vq->split.queue_dma_addr;
+
+	vring->queue_size_in_bytes = vq->split.queue_size_in_bytes;
+
+	vring->desc_extra = vq->split.desc_extra;
+	vring->desc_state = vq->split.desc_state;
+
+	vring->num_left = vring->vring.num - vq->vq.num_free;
+}
+
 static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
 					 struct vring_virtqueue_split *vring)
 {
-- 
2.31.0