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Date: Wed, 13 Apr 2022 11:23:30 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Jason Wang <jasowang@...hat.com>
Cc: Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Hans de Goede <hdegoede@...hat.com>,
Mark Gross <markgross@...nel.org>,
Vadim Pasternak <vadimp@...dia.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Cornelia Huck <cohuck@...hat.com>,
Halil Pasic <pasic@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Johannes Berg <johannes.berg@...el.com>,
Vincent Whitchurch <vincent.whitchurch@...s.com>,
linux-um@...ts.infradead.org, netdev@...r.kernel.org,
platform-driver-x86@...r.kernel.org,
linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
kvm@...r.kernel.org, bpf@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v9 12/32] virtio_ring: packed: extract the logic of alloc queue
On Tue, 12 Apr 2022 14:28:24 +0800, Jason Wang <jasowang@...hat.com> wrote:
>
> 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@...ux.alibaba.com>
> > ---
> > 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);
This idea is very similar to my previous idea, just without introducing a new
structure.
I'd be more than happy to revise this.
Thanks.
>
> 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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