[PATCH v12 06/40] virtio_ring: introduce virtqueue_init()

[Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>]

Separate the logic of virtqueue initialization. This logic is irrelevant
to ring layout.

This logic can be called independently when implementing resize/reset
later.

Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
 drivers/virtio/virtio_ring.c | 61 ++++++++++++++++++------------------
 1 file changed, 31 insertions(+), 30 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 1bc5794e9739..87ce17562b29 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -368,6 +368,34 @@ static int vring_mapping_error(const struct vring_virtqueue *vq,
 	return dma_mapping_error(vring_dma_dev(vq), addr);
 }
 
+static void virtqueue_init(struct vring_virtqueue *vq, u32 num)
+{
+	struct virtio_device *vdev;
+
+	vdev = vq->vq.vdev;
+
+	vq->vq.num_free = num;
+	if (vq->packed_ring)
+		vq->last_used_idx = 0 | (1 << VRING_PACKED_EVENT_F_WRAP_CTR);
+	else
+		vq->last_used_idx = 0;
+	vq->event_triggered = false;
+	vq->num_added = 0;
+	vq->use_dma_api = vring_use_dma_api(vdev);
+#ifdef DEBUG
+	vq->in_use = false;
+	vq->last_add_time_valid = false;
+#endif
+
+	vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
+
+	if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
+		vq->weak_barriers = false;
+
+	/* Put everything in free lists. */
+	vq->free_head = 0;
+}
+
 
 /*
  * Split ring specific functions - *_split().
@@ -1706,7 +1734,6 @@ static struct virtqueue *vring_create_virtqueue_packed(
 	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;
 	vq->notify = notify;
@@ -1716,22 +1743,10 @@ static struct virtqueue *vring_create_virtqueue_packed(
 #else
 	vq->broken = false;
 #endif
-	vq->last_used_idx = 0 | (1 << VRING_PACKED_EVENT_F_WRAP_CTR);
-	vq->event_triggered = false;
-	vq->num_added = 0;
 	vq->packed_ring = true;
-	vq->use_dma_api = vring_use_dma_api(vdev);
-#ifdef DEBUG
-	vq->in_use = false;
-	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))
-		vq->weak_barriers = false;
 
 	vq->packed.ring_dma_addr = ring_dma_addr;
 	vq->packed.driver_event_dma_addr = driver_event_dma_addr;
@@ -1759,8 +1774,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
 	memset(vq->packed.desc_state, 0,
 		num * sizeof(struct vring_desc_state_packed));
 
-	/* Put everything in free lists. */
-	vq->free_head = 0;
+	virtqueue_init(vq, num);
 
 	vq->packed.desc_extra = vring_alloc_desc_extra(num);
 	if (!vq->packed.desc_extra)
@@ -2205,7 +2219,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	vq->vq.callback = callback;
 	vq->vq.vdev = vdev;
 	vq->vq.name = name;
-	vq->vq.num_free = vring.num;
 	vq->vq.index = index;
 	vq->we_own_ring = false;
 	vq->notify = notify;
@@ -2215,21 +2228,9 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
 #else
 	vq->broken = false;
 #endif
-	vq->last_used_idx = 0;
-	vq->event_triggered = false;
-	vq->num_added = 0;
-	vq->use_dma_api = vring_use_dma_api(vdev);
-#ifdef DEBUG
-	vq->in_use = false;
-	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))
-		vq->weak_barriers = false;
 
 	vq->split.queue_dma_addr = 0;
 	vq->split.queue_size_in_bytes = 0;
@@ -2255,11 +2256,11 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	if (!vq->split.desc_extra)
 		goto err_extra;
 
-	/* Put everything in free lists. */
-	vq->free_head = 0;
 	memset(vq->split.desc_state, 0, vring.num *
 			sizeof(struct vring_desc_state_split));
 
+	virtqueue_init(vq, vq->split.vring.num);
+
 	spin_lock(&vdev->vqs_list_lock);
 	list_add_tail(&vq->vq.list, &vdev->vqs);
 	spin_unlock(&vdev->vqs_list_lock);
-- 
2.31.0

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