[PATCH v12 16/40] virtio_ring: packed: extract the logic of alloc queue

Xuan Zhuo
2022-07-20T03:07:15Z

Separate the logic of packed to create vring queue.

For the convenience of passing parameters, add a structure
vring_packed.

This feature is required for subsequent virtuqueue reset vring.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
drivers/virtio/virtio_ring.c | 80 +++++++++++++++++++++++-------------
1 file changed, 51 insertions(+), 29 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 207a2b57270c..a495f1cb7fe4 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1854,19 +1854,10 @@ static void vring_free_packed(struct vring_virtqueue_packed *vring_packed,
kfree(vring_packed->desc_extra);
}

-static struct virtqueue *vring_create_virtqueue_packed(
- unsigned int index,
- unsigned int num,
- unsigned int vring_align,
- struct virtio_device *vdev,
- bool weak_barriers,
- bool may_reduce_num,
- bool context,
- bool (*notify)(struct virtqueue *),
- void (*callback)(struct virtqueue *),
- const char *name)
+static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
+ struct virtio_device *vdev,
+ u32 num)
{
- struct vring_virtqueue *vq;
struct vring_packed_desc *ring;
struct vring_packed_desc_event *driver, *device;
dma_addr_t ring_dma_addr, driver_event_dma_addr, device_event_dma_addr;
@@ -1878,7 +1869,11 @@ static struct virtqueue *vring_create_virtqueue_packed(
&ring_dma_addr,
GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
if (!ring)
- goto err_ring;
+ goto err;
+
+ vring_packed->vring.desc = ring;
+ vring_packed->ring_dma_addr = ring_dma_addr;
+ vring_packed->ring_size_in_bytes = ring_size_in_bytes;

event_size_in_bytes = sizeof(struct vring_packed_desc_event);

@@ -1886,13 +1881,47 @@ static struct virtqueue *vring_create_virtqueue_packed(
&driver_event_dma_addr,
GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
if (!driver)
- goto err_driver;
+ goto err;
+
+ vring_packed->vring.driver = driver;
+ vring_packed->event_size_in_bytes = event_size_in_bytes;
+ vring_packed->driver_event_dma_addr = driver_event_dma_addr;

device = vring_alloc_queue(vdev, event_size_in_bytes,
&device_event_dma_addr,
GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
if (!device)
- goto err_device;
+ goto err;
+
+ vring_packed->vring.device = device;
+ vring_packed->device_event_dma_addr = device_event_dma_addr;
+
+ vring_packed->vring.num = num;
+
+ return 0;
+
+err:
+ vring_free_packed(vring_packed, vdev);
+ return -ENOMEM;
+}
+
+static struct virtqueue *vring_create_virtqueue_packed(
+ unsigned int index,
+ unsigned int num,
+ unsigned int vring_align,
+ struct virtio_device *vdev,
+ bool weak_barriers,
+ bool may_reduce_num,
+ bool context,
+ bool (*notify)(struct virtqueue *),
+ void (*callback)(struct virtqueue *),
+ const char *name)
+{
+ struct vring_virtqueue_packed vring_packed = {};
+ struct vring_virtqueue *vq;
+
+ if (vring_alloc_queue_packed(&vring_packed, vdev, num))
+ goto err_ring;

vq = kmalloc(sizeof(*vq), GFP_KERNEL);
if (!vq)
@@ -1915,17 +1944,14 @@ static struct virtqueue *vring_create_virtqueue_packed(
vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
!context;

- vq->packed.ring_dma_addr = ring_dma_addr;
- vq->packed.driver_event_dma_addr = driver_event_dma_addr;
- vq->packed.device_event_dma_addr = device_event_dma_addr;
+ vq->packed.ring_dma_addr = vring_packed.ring_dma_addr;
+ vq->packed.driver_event_dma_addr = vring_packed.driver_event_dma_addr;
+ vq->packed.device_event_dma_addr = vring_packed.device_event_dma_addr;

- vq->packed.ring_size_in_bytes = ring_size_in_bytes;
- vq->packed.event_size_in_bytes = event_size_in_bytes;
+ vq->packed.ring_size_in_bytes = vring_packed.ring_size_in_bytes;
+ vq->packed.event_size_in_bytes = vring_packed.event_size_in_bytes;

- vq->packed.vring.num = num;
- vq->packed.vring.desc = ring;
- vq->packed.vring.driver = driver;
- vq->packed.vring.device = device;
+ vq->packed.vring = vring_packed.vring;

vq->packed.next_avail_idx = 0;
vq->packed.avail_wrap_counter = 1;
@@ -1964,11 +1990,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
err_desc_state:
kfree(vq);
err_vq:
- vring_free_queue(vdev, event_size_in_bytes, device, device_event_dma_addr);
-err_device:
- vring_free_queue(vdev, event_size_in_bytes, driver, driver_event_dma_addr);
-err_driver:
- vring_free_queue(vdev, ring_size_in_bytes, ring, ring_dma_addr);
+ vring_free_packed(&vring_packed, vdev);
err_ring:
return NULL;
}
--
2.31.0