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virtio-ring: maintain next in extra state for packed virtqueue

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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>
This commit is contained in:
Jason Wang 2021-06-04 13:53:44 +08:00 committed by Michael S. Tsirkin
parent e3aadf2e16
commit aeef9b4733
1 changed files with 8 additions and 7 deletions
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15
drivers/virtio/virtio_ring.c
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@ -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;