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SubjectRe: [PATCH 1/2] vdpa: support per virtqueue max queue size
On Mon, Jul 05, 2021 at 03:19:09PM +0800, Jason Wang wrote:
> Virtio spec allows the device to specify the per virtqueue max queue
> size. vDPA needs to adapt to this flexibility. E.g Qemu advertise a
> small control virtqueue for virtio-net.
>
> So this patch adds a index parameter to get_vq_num_max bus operations
> for the device to report its per virtqueue max queue size.
>
> Both VHOST_VDPA_GET_VRING_NUM and VDPA_ATTR_DEV_MAX_VQ_SIZE assume a
> global maximum size. So we iterate all the virtqueues to return the
> minimal size in this case. Actually, the VHOST_VDPA_GET_VRING_NUM is
> not a must for the userspace. Userspace may choose to check the
> VHOST_SET_VRING_NUM for proving or validating the maximum virtqueue
> size. Anyway, we can invent a per vq version of
> VHOST_VDPA_GET_VRING_NUM in the future if it's necessary.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/vdpa/ifcvf/ifcvf_main.c | 2 +-
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +-
> drivers/vdpa/vdpa.c | 22 +++++++++++++++++++++-
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +-
> drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +-
> drivers/vhost/vdpa.c | 9 ++++++---
> drivers/virtio/virtio_vdpa.c | 2 +-
> include/linux/vdpa.h | 5 ++++-
> 8 files changed, 36 insertions(+), 10 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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