The purpose of this patch is to make vring packed support re-enable reset
vq.
Based on whether the incoming vq passed by vring_setup_virtqueue() is
NULL or not, distinguish whether it is a normal create virtqueue or
re-enable a reset queue.
When re-enable a reset queue, reuse the original callback, name, indirect.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 4639e1643c78..20659f7ca582 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1683,7 +1683,8 @@ static struct virtqueue *vring_create_virtqueue_packed(
bool context,
bool (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
- const char *name)
+ const char *name,
+ struct virtqueue *_vq)
{
struct vring_virtqueue *vq;
struct vring_packed_desc *ring;
@@ -1713,13 +1714,20 @@ static struct virtqueue *vring_create_virtqueue_packed(
if (!device)
goto err_device;
- vq = kmalloc(sizeof(*vq), GFP_KERNEL);
- if (!vq)
- goto err_vq;
+ if (_vq) {
+ vq = to_vvq(_vq);
+ } else {
+ vq = kmalloc(sizeof(*vq), GFP_KERNEL);
+ if (!vq)
+ goto err_vq;
+
+ vq->vq.callback = callback;
+ vq->vq.name = name;
+ vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
+ !context;
+ }
- vq->vq.callback = callback;
vq->vq.vdev = vdev;
- vq->vq.name = name;
vq->vq.num_free = num;
vq->vq.index = index;
vq->we_own_ring = true;
@@ -1736,8 +1744,6 @@ static struct virtqueue *vring_create_virtqueue_packed(
vq->last_add_time_valid = false;
#endif
- vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
- !context;
vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
@@ -1778,7 +1784,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
goto err_desc_extra;
/* No callback? Tell other side not to bother us. */
- if (!callback) {
+ if (!vq->vq.callback) {
vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;
vq->packed.vring.driver->flags =
cpu_to_le16(vq->packed.event_flags_shadow);
@@ -1792,7 +1798,8 @@ static struct virtqueue *vring_create_virtqueue_packed(
err_desc_extra:
kfree(vq->packed.desc_state);
err_desc_state:
- kfree(vq);
+ if (!_vq)
+ kfree(vq);
err_vq:
vring_free_queue(vdev, event_size_in_bytes, device, device_event_dma_addr);
err_device:
@@ -2317,7 +2324,7 @@ struct virtqueue *vring_setup_virtqueue(
if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
return vring_create_virtqueue_packed(index, num, vring_align,
vdev, weak_barriers, may_reduce_num,
- context, notify, callback, name);
+ context, notify, callback, name, vq);
return vring_create_virtqueue_split(index, num, vring_align,
vdev, weak_barriers, may_reduce_num,
--
2.31.0
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