[PATCH v8 01/16] virtio: add helper virtqueue_get_vring_max_size()

Cornelia Huck
Mon, 14 Mar 2022 09:50:08 -0000

On Mon, Mar 14 2022, Xuan Zhuo <xuanzhuo at linux.alibaba.com> wrote:

> Record the maximum queue num supported by the device.
>
> virtio-net can display the maximum (supported by hardware) ring size in
> ethtool -g eth0.
>
> When the subsequent patch implements vring reset, it can judge whether
> the ring size passed by the driver is legal based on this.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com>
> Acked-by: Jason Wang <jasowang at redhat.com>
> ---
>  drivers/virtio/virtio_mmio.c       |  2 ++
>  drivers/virtio/virtio_pci_legacy.c |  2 ++
>  drivers/virtio/virtio_pci_modern.c |  2 ++
>  drivers/virtio/virtio_ring.c       | 14 ++++++++++++++
>  include/linux/virtio.h             |  2 ++
>  5 files changed, 22 insertions(+)

Don't you also need to init this for ccw (even though we won't do ring
reset there), just for completeness? (Any other transports?)