Jason Wang
2022-Jul-01 08:26 UTC
[PATCH v11 08/40] virtio_ring: split: extract the logic of alloc queue
? 2022/6/29 14:56, Xuan Zhuo ??:> Separate the logic of split to create vring queue. > > This feature is required for subsequent virtuqueue reset vring. > > Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com> > --- > drivers/virtio/virtio_ring.c | 68 ++++++++++++++++++++++-------------- > 1 file changed, 42 insertions(+), 26 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index 49d61e412dc6..a9ceb9c16c54 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -949,28 +949,19 @@ static void vring_free_split(struct vring_virtqueue_split *vring, > kfree(vring->desc_extra); > } > > -static struct virtqueue *vring_create_virtqueue_split( > - 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_split(struct vring_virtqueue_split *vring, > + struct virtio_device *vdev, > + u32 num, > + unsigned int vring_align, > + bool may_reduce_num) > { > - struct virtqueue *vq; > void *queue = NULL; > dma_addr_t dma_addr; > - size_t queue_size_in_bytes; > - struct vring vring; > > /* We assume num is a power of 2. */ > if (num & (num - 1)) { > dev_warn(&vdev->dev, "Bad virtqueue length %u\n", num); > - return NULL; > + return -EINVAL; > } > > /* TODO: allocate each queue chunk individually */ > @@ -981,11 +972,11 @@ static struct virtqueue *vring_create_virtqueue_split( > if (queue) > break; > if (!may_reduce_num) > - return NULL; > + return -ENOMEM; > } > > if (!num) > - return NULL; > + return -ENOMEM; > > if (!queue) { > /* Try to get a single page. You are my only hope! */ > @@ -993,21 +984,46 @@ static struct virtqueue *vring_create_virtqueue_split( > &dma_addr, GFP_KERNEL|__GFP_ZERO); > } > if (!queue) > - return NULL; > + return -ENOMEM; > + > + vring_init(&vring->vring, num, queue, vring_align); > > - queue_size_in_bytes = vring_size(num, vring_align); > - vring_init(&vring, num, queue, vring_align); > + vring->queue_dma_addr = dma_addr; > + vring->queue_size_in_bytes = vring_size(num, vring_align); > + > + return 0; > +} > + > +static struct virtqueue *vring_create_virtqueue_split( > + 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_split vring = {}; > + struct virtqueue *vq; > + int err; > + > + err = vring_alloc_queue_split(&vring, vdev, num, vring_align, > + may_reduce_num); > + if (err) > + return NULL; > > - vq = __vring_new_virtqueue(index, vring, vdev, weak_barriers, context, > - notify, callback, name); > + vq = __vring_new_virtqueue(index, vring.vring, vdev, weak_barriers, > + context, notify, callback, name); > if (!vq) { > - vring_free_queue(vdev, queue_size_in_bytes, queue, > - dma_addr); > + vring_free_split(&vring, vdev); > return NULL; > } > > - to_vvq(vq)->split.queue_dma_addr = dma_addr; > - to_vvq(vq)->split.queue_size_in_bytes = queue_size_in_bytes; > + to_vvq(vq)->split.queue_dma_addr = vring.queue_dma_addr;Nit: having two queue_dma_addr seems redundant (so did queue_size_in_bytes). Thanks> + to_vvq(vq)->split.queue_size_in_bytes = vring.queue_size_in_bytes; > to_vvq(vq)->we_own_ring = true; > > return vq;
Xuan Zhuo
2022-Jul-01 08:45 UTC
[PATCH v11 08/40] virtio_ring: split: extract the logic of alloc queue
On Fri, 1 Jul 2022 16:26:25 +0800, Jason Wang <jasowang at redhat.com> wrote:> > ? 2022/6/29 14:56, Xuan Zhuo ??: > > Separate the logic of split to create vring queue. > > > > This feature is required for subsequent virtuqueue reset vring. > > > > Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com> > > --- > > drivers/virtio/virtio_ring.c | 68 ++++++++++++++++++++++-------------- > > 1 file changed, 42 insertions(+), 26 deletions(-) > > > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > > index 49d61e412dc6..a9ceb9c16c54 100644 > > --- a/drivers/virtio/virtio_ring.c > > +++ b/drivers/virtio/virtio_ring.c > > @@ -949,28 +949,19 @@ static void vring_free_split(struct vring_virtqueue_split *vring, > > kfree(vring->desc_extra); > > } > > > > -static struct virtqueue *vring_create_virtqueue_split( > > - 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_split(struct vring_virtqueue_split *vring, > > + struct virtio_device *vdev, > > + u32 num, > > + unsigned int vring_align, > > + bool may_reduce_num) > > { > > - struct virtqueue *vq; > > void *queue = NULL; > > dma_addr_t dma_addr; > > - size_t queue_size_in_bytes; > > - struct vring vring; > > > > /* We assume num is a power of 2. */ > > if (num & (num - 1)) { > > dev_warn(&vdev->dev, "Bad virtqueue length %u\n", num); > > - return NULL; > > + return -EINVAL; > > } > > > > /* TODO: allocate each queue chunk individually */ > > @@ -981,11 +972,11 @@ static struct virtqueue *vring_create_virtqueue_split( > > if (queue) > > break; > > if (!may_reduce_num) > > - return NULL; > > + return -ENOMEM; > > } > > > > if (!num) > > - return NULL; > > + return -ENOMEM; > > > > if (!queue) { > > /* Try to get a single page. You are my only hope! */ > > @@ -993,21 +984,46 @@ static struct virtqueue *vring_create_virtqueue_split( > > &dma_addr, GFP_KERNEL|__GFP_ZERO); > > } > > if (!queue) > > - return NULL; > > + return -ENOMEM; > > + > > + vring_init(&vring->vring, num, queue, vring_align); > > > > - queue_size_in_bytes = vring_size(num, vring_align); > > - vring_init(&vring, num, queue, vring_align); > > + vring->queue_dma_addr = dma_addr; > > + vring->queue_size_in_bytes = vring_size(num, vring_align); > > + > > + return 0; > > +} > > + > > +static struct virtqueue *vring_create_virtqueue_split( > > + 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_split vring = {}; > > + struct virtqueue *vq; > > + int err; > > + > > + err = vring_alloc_queue_split(&vring, vdev, num, vring_align, > > + may_reduce_num); > > + if (err) > > + return NULL; > > > > - vq = __vring_new_virtqueue(index, vring, vdev, weak_barriers, context, > > - notify, callback, name); > > + vq = __vring_new_virtqueue(index, vring.vring, vdev, weak_barriers, > > + context, notify, callback, name); > > if (!vq) { > > - vring_free_queue(vdev, queue_size_in_bytes, queue, > > - dma_addr); > > + vring_free_split(&vring, vdev); > > return NULL; > > } > > > > - to_vvq(vq)->split.queue_dma_addr = dma_addr; > > - to_vvq(vq)->split.queue_size_in_bytes = queue_size_in_bytes; > > + to_vvq(vq)->split.queue_dma_addr = vring.queue_dma_addr; > > > Nit: having two queue_dma_addr seems redundant (so did queue_size_in_bytes).two? Where is the problem I don't understand? Thanks.> > Thanks > > > > + to_vvq(vq)->split.queue_size_in_bytes = vring.queue_size_in_bytes; > > to_vvq(vq)->we_own_ring = true; > > > > return vq; >