Xuan Zhuo
2022-Mar-14 09:34 UTC
[PATCH v8 11/16] virtio_ring: packed: extract the logic of alloc queue
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 at linux.alibaba.com>
---
drivers/virtio/virtio_ring.c | 121 ++++++++++++++++++++++++++---------
1 file changed, 92 insertions(+), 29 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index a15869514146..96ff2dabda14 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -85,6 +85,18 @@ struct vring_desc_extra {
u16 next; /* The next desc state in a list. */
};
+struct vring_packed {
+ 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 {
struct virtqueue vq;
@@ -1735,45 +1747,101 @@ 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 void vring_free_vring_packed(struct vring_packed *vring,
+ struct virtio_device *vdev)
+{
+ 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;
+
+ ring = vring->ring;
+ driver = vring->driver;
+ device = vring->device;
+ ring_size_in_bytes = vring->ring_size_in_bytes;
+ event_size_in_bytes = vring->event_size_in_bytes;
+ ring_dma_addr = vring->ring_dma_addr;
+ driver_event_dma_addr = vring->driver_event_dma_addr;
+ device_event_dma_addr = vring->device_event_dma_addr;
+
+ if (device)
+ vring_free_queue(vdev, event_size_in_bytes, device, device_event_dma_addr);
+
+ if (driver)
+ vring_free_queue(vdev, event_size_in_bytes, driver, driver_event_dma_addr);
+
+ if (ring)
+ vring_free_queue(vdev, ring_size_in_bytes, ring, ring_dma_addr);
+}
+
+static int vring_alloc_queue_packed(struct vring_packed *vring,
+ 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;
size_t ring_size_in_bytes, event_size_in_bytes;
+ memset(vring, 0, sizeof(*vring));
+
ring_size_in_bytes = num * sizeof(struct vring_packed_desc);
ring = vring_alloc_queue(vdev, ring_size_in_bytes,
&ring_dma_addr,
GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
if (!ring)
- goto err_ring;
+ goto err;
+
+ vring->num = num;
+ vring->ring = ring;
+ vring->ring_size_in_bytes = ring_size_in_bytes;
+ vring->ring_dma_addr = ring_dma_addr;
event_size_in_bytes = sizeof(struct vring_packed_desc_event);
+ vring->event_size_in_bytes = event_size_in_bytes;
driver = vring_alloc_queue(vdev, event_size_in_bytes,
&driver_event_dma_addr,
GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
if (!driver)
- goto err_driver;
+ goto err;
+
+ vring->driver = driver;
+ vring->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->device = device;
+ vring->device_event_dma_addr = device_event_dma_addr;
+ return 0;
+
+err:
+ vring_free_vring_packed(vring, 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 *vq;
+ struct vring_packed vring;
+
+ if (vring_alloc_queue_packed(&vring, vdev, num))
+ goto err_vq;
vq = kmalloc(sizeof(*vq), GFP_KERNEL);
if (!vq)
@@ -1805,17 +1873,17 @@ static struct virtqueue *vring_create_virtqueue_packed(
if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
vq->weak_barriers = false;
- 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.ring_dma_addr;
+ vq->packed.driver_event_dma_addr = vring.driver_event_dma_addr;
+ vq->packed.device_event_dma_addr = vring.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.ring_size_in_bytes;
+ vq->packed.event_size_in_bytes = vring.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.desc = vring.ring;
+ vq->packed.vring.driver = vring.driver;
+ vq->packed.vring.device = vring.device;
vq->packed.next_avail_idx = 0;
vq->packed.avail_wrap_counter = 1;
@@ -1856,12 +1924,7 @@ 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);
-err_ring:
+ vring_free_vring_packed(&vring, vdev);
return NULL;
}
--
2.31.0
Jason Wang
2022-Mar-22 06:38 UTC
[PATCH v8 11/16] virtio_ring: packed: extract the logic of alloc queue
? 2022/3/14 ??5:34, Xuan Zhuo ??:> 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 at linux.alibaba.com> > --- > drivers/virtio/virtio_ring.c | 121 ++++++++++++++++++++++++++--------- > 1 file changed, 92 insertions(+), 29 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index a15869514146..96ff2dabda14 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -85,6 +85,18 @@ struct vring_desc_extra { > u16 next; /* The next desc state in a list. */ > }; > > +struct vring_packed { > + 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; > +}; > +Interesting,? a nitpick here is that if it is only used by one helper, it's probably not worth to bother. And if we want to do that, we need 1) use a separated patch 2) do it for split virtqueue as well Thanks> struct vring_virtqueue { > struct virtqueue vq; > > @@ -1735,45 +1747,101 @@ 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 void vring_free_vring_packed(struct vring_packed *vring, > + struct virtio_device *vdev) > +{ > + 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; > + > + ring = vring->ring; > + driver = vring->driver; > + device = vring->device; > + ring_size_in_bytes = vring->ring_size_in_bytes; > + event_size_in_bytes = vring->event_size_in_bytes; > + ring_dma_addr = vring->ring_dma_addr; > + driver_event_dma_addr = vring->driver_event_dma_addr; > + device_event_dma_addr = vring->device_event_dma_addr; > + > + if (device) > + vring_free_queue(vdev, event_size_in_bytes, device, device_event_dma_addr); > + > + if (driver) > + vring_free_queue(vdev, event_size_in_bytes, driver, driver_event_dma_addr); > + > + if (ring) > + vring_free_queue(vdev, ring_size_in_bytes, ring, ring_dma_addr); > +} > + > +static int vring_alloc_queue_packed(struct vring_packed *vring, > + 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; > size_t ring_size_in_bytes, event_size_in_bytes; > > + memset(vring, 0, sizeof(*vring)); > + > ring_size_in_bytes = num * sizeof(struct vring_packed_desc); > > ring = vring_alloc_queue(vdev, ring_size_in_bytes, > &ring_dma_addr, > GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO); > if (!ring) > - goto err_ring; > + goto err; > + > + vring->num = num; > + vring->ring = ring; > + vring->ring_size_in_bytes = ring_size_in_bytes; > + vring->ring_dma_addr = ring_dma_addr; > > event_size_in_bytes = sizeof(struct vring_packed_desc_event); > + vring->event_size_in_bytes = event_size_in_bytes; > > driver = vring_alloc_queue(vdev, event_size_in_bytes, > &driver_event_dma_addr, > GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO); > if (!driver) > - goto err_driver; > + goto err; > + > + vring->driver = driver; > + vring->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->device = device; > + vring->device_event_dma_addr = device_event_dma_addr; > + return 0; > + > +err: > + vring_free_vring_packed(vring, 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 *vq; > + struct vring_packed vring; > + > + if (vring_alloc_queue_packed(&vring, vdev, num)) > + goto err_vq; > > vq = kmalloc(sizeof(*vq), GFP_KERNEL); > if (!vq) > @@ -1805,17 +1873,17 @@ static struct virtqueue *vring_create_virtqueue_packed( > if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM)) > vq->weak_barriers = false; > > - 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.ring_dma_addr; > + vq->packed.driver_event_dma_addr = vring.driver_event_dma_addr; > + vq->packed.device_event_dma_addr = vring.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.ring_size_in_bytes; > + vq->packed.event_size_in_bytes = vring.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.desc = vring.ring; > + vq->packed.vring.driver = vring.driver; > + vq->packed.vring.device = vring.device; > > vq->packed.next_avail_idx = 0; > vq->packed.avail_wrap_counter = 1; > @@ -1856,12 +1924,7 @@ 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); > -err_ring: > + vring_free_vring_packed(&vring, vdev); > return NULL; > } >