[PATCH 17/19] virtio_ring: move next_avail_idx to vring_virtqueue

[Jason Wang]

This variable is used by packed virtqueue now, moving it to
vring_virtqueue to make it possible to be reused by split virtqueue
in-order implementation.

Signed-off-by: Jason Wang <jasow...@redhat.com>
---
 drivers/virtio/virtio_ring.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index bd4faf04862c..a1a8cd931052 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -138,9 +138,6 @@ struct vring_virtqueue_packed {
        /* Avail used flags. */
        u16 avail_used_flags;
 
-       /* Index of the next avail descriptor. */
-       u16 next_avail_idx;
-
        /*
         * Last written value to driver->flags in
         * guest byte order.
@@ -214,6 +211,9 @@ struct vring_virtqueue {
         */
        u16 last_used_idx;
 
+       /* Index of the next avail descriptor. */
+       u16 next_avail_idx;
+
        /* Hint for event idx: already triggered no need to disable. */
        bool event_triggered;
 
@@ -448,6 +448,7 @@ static void virtqueue_init(struct vring_virtqueue *vq, u32 
num)
        else
                vq->last_used_idx = 0;
 
+       vq->next_avail_idx = 0;
        vq->event_triggered = false;
        vq->num_added = 0;
 
@@ -1350,7 +1351,7 @@ static int virtqueue_add_indirect_packed(struct 
vring_virtqueue *vq,
        u16 head, id;
        dma_addr_t addr;
 
-       head = vq->packed.next_avail_idx;
+       head = vq->next_avail_idx;
        desc = alloc_indirect_packed(total_sg, gfp);
        if (!desc)
                return -ENOMEM;
@@ -1431,7 +1432,7 @@ static int virtqueue_add_indirect_packed(struct 
vring_virtqueue *vq,
                                1 << VRING_PACKED_DESC_F_AVAIL |
                                1 << VRING_PACKED_DESC_F_USED;
        }
-       vq->packed.next_avail_idx = n;
+       vq->next_avail_idx = n;
        vq->free_head = vq->packed.desc_extra[id].next;
 
        /* Store token and indirect buffer state. */
@@ -1501,7 +1502,7 @@ static inline int virtqueue_add_packed(struct 
vring_virtqueue *vq,
                /* fall back on direct */
        }
 
-       head = vq->packed.next_avail_idx;
+       head = vq->next_avail_idx;
        avail_used_flags = vq->packed.avail_used_flags;
 
        WARN_ON_ONCE(total_sg > vq->packed.vring.num && !vq->indirect);
@@ -1569,7 +1570,7 @@ static inline int virtqueue_add_packed(struct 
vring_virtqueue *vq,
        vq->vq.num_free -= descs_used;
 
        /* Update free pointer */
-       vq->packed.next_avail_idx = i;
+       vq->next_avail_idx = i;
        vq->free_head = curr;
 
        /* Store token. */
@@ -1633,8 +1634,8 @@ static bool virtqueue_kick_prepare_packed(struct 
vring_virtqueue *vq)
         */
        virtio_mb(vq->weak_barriers);
 
-       old = vq->packed.next_avail_idx - vq->num_added;
-       new = vq->packed.next_avail_idx;
+       old = vq->next_avail_idx - vq->num_added;
+       new = vq->next_avail_idx;
        vq->num_added = 0;
 
        snapshot.u32 = *(u32 *)vq->packed.vring.device;
@@ -2083,7 +2084,6 @@ static int vring_alloc_state_extra_packed(struct 
vring_virtqueue_packed *vring_p
 static void virtqueue_vring_init_packed(struct vring_virtqueue_packed 
*vring_packed,
                                        bool callback)
 {
-       vring_packed->next_avail_idx = 0;
        vring_packed->avail_wrap_counter = 1;
        vring_packed->event_flags_shadow = 0;
        vring_packed->avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
@@ -2977,7 +2977,7 @@ u32 vring_notification_data(struct virtqueue *_vq)
        u16 next;
 
        if (vq->packed_ring)
-               next = (vq->packed.next_avail_idx &
+               next = (vq->next_avail_idx &
                                ~(-(1 << VRING_PACKED_EVENT_F_WRAP_CTR))) |
                        vq->packed.avail_wrap_counter <<
                                VRING_PACKED_EVENT_F_WRAP_CTR;
-- 
2.42.0