Re: [PATCH v9 12/32] virtio_ring: packed: extract the logic of alloc queue

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在 2022/4/6 上午11:43, Xuan Zhuo 写道:
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@xxxxxxxxxxxxxxxxx>
---
  drivers/virtio/virtio_ring.c | 70 ++++++++++++++++++++++++++++--------
  1 file changed, 56 insertions(+), 14 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 33864134a744..ea451ae2aaef 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1817,19 +1817,17 @@ static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num)
  	return 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 virtio_device *vdev,
+				    u32 num,
+				    struct vring_packed_desc **_ring,
+				    struct vring_packed_desc_event **_driver,
+				    struct vring_packed_desc_event **_device,
+				    dma_addr_t *_ring_dma_addr,
+				    dma_addr_t *_driver_event_dma_addr,
+				    dma_addr_t *_device_event_dma_addr,
+				    size_t *_ring_size_in_bytes,
+				    size_t *_event_size_in_bytes)
  {
-	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;
@@ -1857,6 +1855,52 @@ static struct virtqueue *vring_create_virtqueue_packed(
  	if (!device)
  		goto err_device;
+ *_ring = ring;
+	*_driver                 = driver;
+	*_device                 = device;
+	*_ring_dma_addr          = ring_dma_addr;
+	*_driver_event_dma_addr  = driver_event_dma_addr;
+	*_device_event_dma_addr  = device_event_dma_addr;
+	*_ring_size_in_bytes     = ring_size_in_bytes;
+	*_event_size_in_bytes    = event_size_in_bytes;


I wonder if we can simply factor out split and packed from struct vring_virtqueue:

struct vring_virtqueue {
    union {
        struct {} split;
        struct {} packed;
    };
};

to

struct vring_virtqueue_split {};
struct vring_virtqueue_packed {};

Then we can do things like:

vring_create_virtqueue_packed(struct virtio_device *vdev, u32 num, struct vring_virtqueue_packed *packed);

and

vring_vritqueue_attach_packed(struct vring_virtqueue *vq, struct vring_virtqueue_packed packed);

Thanks


+
+	return 0;
+
+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);
+
+err_ring:
+	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)
+{
+	dma_addr_t ring_dma_addr, driver_event_dma_addr, device_event_dma_addr;
+	struct vring_packed_desc_event *driver, *device;
+	size_t ring_size_in_bytes, event_size_in_bytes;
+	struct vring_packed_desc *ring;
+	struct vring_virtqueue *vq;
+
+	if (vring_alloc_queue_packed(vdev, num, &ring, &driver, &device,
+				     &ring_dma_addr, &driver_event_dma_addr,
+				     &device_event_dma_addr,
+				     &ring_size_in_bytes,
+				     &event_size_in_bytes))
+		goto err_ring;
+
  	vq = kmalloc(sizeof(*vq), GFP_KERNEL);
  	if (!vq)
  		goto err_vq;
@@ -1939,9 +1983,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
  	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);
  err_ring:
  	return NULL;




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