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authorXuan Zhuo <xuanzhuo@linux.alibaba.com>2022-08-01 14:38:44 +0800
committerMichael S. Tsirkin <mst@redhat.com>2022-08-11 04:06:40 -0400
commitc790e8e1817f1a17c05e64f1c4f16f231b8529d5 (patch)
tree415b01b4ab5bd794d4266ebf4509bb53adb41afa /include/linux/virtio.h
parent947f9fcf674f8f3f09e01dfb5d8e564650875878 (diff)
virtio_ring: introduce virtqueue_resize()
Introduce virtqueue_resize() to implement the resize of vring. Based on these, the driver can dynamically adjust the size of the vring. For example: ethtool -G. virtqueue_resize() implements resize based on the vq reset function. In case of failure to allocate a new vring, it will give up resize and use the original vring. During this process, if the re-enable reset vq fails, the vq can no longer be used. Although the probability of this situation is not high. The parameter recycle is used to recycle the buffer that is no longer used. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Message-Id: <20220801063902.129329-25-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/linux/virtio.h')
-rw-r--r--include/linux/virtio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 129bde7521e3..62e31bca5602 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -91,6 +91,9 @@ dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq);
dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq);
dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);
+int virtqueue_resize(struct virtqueue *vq, u32 num,
+ void (*recycle)(struct virtqueue *vq, void *buf));
+
/**
* virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus