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authorJason Wang <jasowang@redhat.com>2021-06-04 13:53:44 +0800
committerMichael S. Tsirkin <mst@redhat.com>2021-07-08 07:49:01 -0400
commitaeef9b4733c5c2356c75ba4f5c99e1a09ff1721d (patch)
treedf11b2919bb51dbd72c1635add457610f6f47a54 /drivers/virtio
parente3aadf2e1614174dc81d52cbb9dabb77913b11c6 (diff)
virtio-ring: maintain next in extra state for packed virtqueue
This patch moves next from vring_desc_state_packed to vring_desc_desc_extra_packed. This makes it simpler to let extra state to be reused by split virtqueue. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210604055350.58753-2-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_ring.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 992cb1cbec93..51d898667854 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -74,7 +74,6 @@ struct vring_desc_state_packed {
void *data; /* Data for callback. */
struct vring_packed_desc *indir_desc; /* Indirect descriptor, if any. */
u16 num; /* Descriptor list length. */
- u16 next; /* The next desc state in a list. */
u16 last; /* The last desc state in a list. */
};
@@ -82,6 +81,7 @@ struct vring_desc_extra_packed {
dma_addr_t addr; /* Buffer DMA addr. */
u32 len; /* Buffer length. */
u16 flags; /* Descriptor flags. */
+ u16 next; /* The next desc state in a list. */
};
struct vring_virtqueue {
@@ -1067,7 +1067,7 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
1 << VRING_PACKED_DESC_F_USED;
}
vq->packed.next_avail_idx = n;
- vq->free_head = vq->packed.desc_state[id].next;
+ vq->free_head = vq->packed.desc_extra[id].next;
/* Store token and indirect buffer state. */
vq->packed.desc_state[id].num = 1;
@@ -1175,7 +1175,7 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
le16_to_cpu(flags);
}
prev = curr;
- curr = vq->packed.desc_state[curr].next;
+ curr = vq->packed.desc_extra[curr].next;
if ((unlikely(++i >= vq->packed.vring.num))) {
i = 0;
@@ -1296,7 +1296,7 @@ static void detach_buf_packed(struct vring_virtqueue *vq,
/* Clear data ptr. */
state->data = NULL;
- vq->packed.desc_state[state->last].next = vq->free_head;
+ vq->packed.desc_extra[state->last].next = vq->free_head;
vq->free_head = id;
vq->vq.num_free += state->num;
@@ -1305,7 +1305,7 @@ static void detach_buf_packed(struct vring_virtqueue *vq,
for (i = 0; i < state->num; i++) {
vring_unmap_state_packed(vq,
&vq->packed.desc_extra[curr]);
- curr = vq->packed.desc_state[curr].next;
+ curr = vq->packed.desc_extra[curr].next;
}
}
@@ -1656,8 +1656,6 @@ static struct virtqueue *vring_create_virtqueue_packed(
/* Put everything in free lists. */
vq->free_head = 0;
- for (i = 0; i < num-1; i++)
- vq->packed.desc_state[i].next = i + 1;
vq->packed.desc_extra = kmalloc_array(num,
sizeof(struct vring_desc_extra_packed),
@@ -1668,6 +1666,9 @@ static struct virtqueue *vring_create_virtqueue_packed(
memset(vq->packed.desc_extra, 0,
num * sizeof(struct vring_desc_extra_packed));
+ for (i = 0; i < num - 1; i++)
+ vq->packed.desc_extra[i].next = i + 1;
+
/* No callback? Tell other side not to bother us. */
if (!callback) {
vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;