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Message-Id: <20230810123057.43407-9-xuanzhuo@linux.alibaba.com>
Date: Thu, 10 Aug 2023 20:30:53 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: virtualization@...ts.linux-foundation.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
netdev@...r.kernel.org,
bpf@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>
Subject: [PATCH vhost v13 08/12] virtio_ring: separate the logic of reset/enable from virtqueue_resize
The subsequent reset function will reuse these logic.
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Acked-by: Jason Wang <jasowang@...hat.com>
---
drivers/virtio/virtio_ring.c | 58 ++++++++++++++++++++++++------------
1 file changed, 39 insertions(+), 19 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index fd9ae020e0a3..23172d98e48e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2152,6 +2152,43 @@ static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
return -ENOMEM;
}
+static int virtqueue_disable_and_recycle(struct virtqueue *_vq,
+ void (*recycle)(struct virtqueue *vq, void *buf))
+{
+ struct vring_virtqueue *vq = to_vvq(_vq);
+ struct virtio_device *vdev = vq->vq.vdev;
+ void *buf;
+ int err;
+
+ if (!vq->we_own_ring)
+ return -EPERM;
+
+ if (!vdev->config->disable_vq_and_reset)
+ return -ENOENT;
+
+ if (!vdev->config->enable_vq_after_reset)
+ return -ENOENT;
+
+ err = vdev->config->disable_vq_and_reset(_vq);
+ if (err)
+ return err;
+
+ while ((buf = virtqueue_detach_unused_buf(_vq)) != NULL)
+ recycle(_vq, buf);
+
+ return 0;
+}
+
+static int virtqueue_enable_after_reset(struct virtqueue *_vq)
+{
+ struct vring_virtqueue *vq = to_vvq(_vq);
+ struct virtio_device *vdev = vq->vq.vdev;
+
+ if (vdev->config->enable_vq_after_reset(_vq))
+ return -EBUSY;
+
+ return 0;
+}
/*
* Generic functions and exported symbols.
@@ -2702,13 +2739,8 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
void (*recycle)(struct virtqueue *vq, void *buf))
{
struct vring_virtqueue *vq = to_vvq(_vq);
- struct virtio_device *vdev = vq->vq.vdev;
- void *buf;
int err;
- if (!vq->we_own_ring)
- return -EPERM;
-
if (num > vq->vq.num_max)
return -E2BIG;
@@ -2718,28 +2750,16 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
if ((vq->packed_ring ? vq->packed.vring.num : vq->split.vring.num) == num)
return 0;
- if (!vdev->config->disable_vq_and_reset)
- return -ENOENT;
-
- if (!vdev->config->enable_vq_after_reset)
- return -ENOENT;
-
- err = vdev->config->disable_vq_and_reset(_vq);
+ err = virtqueue_disable_and_recycle(_vq, recycle);
if (err)
return err;
- while ((buf = virtqueue_detach_unused_buf(_vq)) != NULL)
- recycle(_vq, buf);
-
if (vq->packed_ring)
err = virtqueue_resize_packed(_vq, num);
else
err = virtqueue_resize_split(_vq, num);
- if (vdev->config->enable_vq_after_reset(_vq))
- return -EBUSY;
-
- return err;
+ return virtqueue_enable_after_reset(_vq);
}
EXPORT_SYMBOL_GPL(virtqueue_resize);
--
2.32.0.3.g01195cf9f
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