diff options
| author | Jason Wang | 2021-06-04 13:53:46 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin | 2021-07-08 07:49:01 -0400 |
| commit | 5a22242160201b819be2fe67e15cc9338f3ee582 (patch) | |
| tree | 1cfc2996e37194518e9091367a27bde6ea0aad2f /drivers/virtio | |
| parent | 1f28750f2e113132791161563c6e7b99eaa4c46b (diff) | |
virtio-ring: factor out desc_extra allocation
A helper is introduced for the logic of allocating the descriptor
extra data. This will be reused by split virtqueue.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210604055350.58753-4-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 03caa19fca67..f2f4a3b635f3 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -1556,6 +1556,25 @@ static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq) return NULL; } +static struct vring_desc_extra *vring_alloc_desc_extra(struct vring_virtqueue *vq, + unsigned int num) +{ + struct vring_desc_extra *desc_extra; + unsigned int i; + + desc_extra = kmalloc_array(num, sizeof(struct vring_desc_extra), + GFP_KERNEL); + if (!desc_extra) + return NULL; + + memset(desc_extra, 0, num * sizeof(struct vring_desc_extra)); + + for (i = 0; i < num - 1; i++) + desc_extra[i].next = i + 1; + + return desc_extra; +} + static struct virtqueue *vring_create_virtqueue_packed( unsigned int index, unsigned int num, @@ -1573,7 +1592,6 @@ static struct virtqueue *vring_create_virtqueue_packed( struct vring_packed_desc_event *driver, *device; dma_addr_t ring_dma_addr, driver_event_dma_addr, device_event_dma_addr; size_t ring_size_in_bytes, event_size_in_bytes; - unsigned int i; ring_size_in_bytes = num * sizeof(struct vring_packed_desc); @@ -1657,18 +1675,10 @@ static struct virtqueue *vring_create_virtqueue_packed( /* Put everything in free lists. */ vq->free_head = 0; - vq->packed.desc_extra = kmalloc_array(num, - sizeof(struct vring_desc_extra), - GFP_KERNEL); + vq->packed.desc_extra = vring_alloc_desc_extra(vq, num); if (!vq->packed.desc_extra) goto err_desc_extra; - memset(vq->packed.desc_extra, 0, - num * sizeof(struct vring_desc_extra)); - - 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; |