On Fri, Mar 17, 2023 at 3:45 PM Yongji Xie <xieyongji@xxxxxxxxxxxxx> wrote:
>
> On Thu, Mar 16, 2023 at 12:03 PM Jason Wang <jasowang@xxxxxxxxxx> wrote:
> >
> > On Tue, Feb 28, 2023 at 5:42 PM Xie Yongji <xieyongji@xxxxxxxxxxxxx> wrote:
> > >
> > > This introduces set_irq_affinity callback in
> > > vdpa_config_ops so that vdpa device driver can
> > > get the interrupt affinity hint from the virtio
> > > device driver. The interrupt affinity hint would
> > > be needed by the interrupt affinity spreading
> > > mechanism.
> > >
> > > Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
> > > ---
> > > drivers/virtio/virtio_vdpa.c | 4 ++++
> > > include/linux/vdpa.h | 9 +++++++++
> > > 2 files changed, 13 insertions(+)
> > >
> > > diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> > > index f72696b4c1c2..9eee8afabda8 100644
> > > --- a/drivers/virtio/virtio_vdpa.c
> > > +++ b/drivers/virtio/virtio_vdpa.c
> > > @@ -282,9 +282,13 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
> > > struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
> > > struct vdpa_device *vdpa = vd_get_vdpa(vdev);
> > > const struct vdpa_config_ops *ops = vdpa->config;
> > > + struct irq_affinity default_affd = { 0 };
> > > struct vdpa_callback cb;
> > > int i, err, queue_idx = 0;
> > >
> > > + if (ops->set_irq_affinity)
> > > + ops->set_irq_affinity(vdpa, desc ? desc : &default_affd);
> > > +
> > > for (i = 0; i < nvqs; ++i) {
> > > if (!names[i]) {
> > > vqs[i] = NULL;
> > > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > > index d61f369f9cd6..10bd22387276 100644
> > > --- a/include/linux/vdpa.h
> > > +++ b/include/linux/vdpa.h
> > > @@ -259,6 +259,13 @@ struct vdpa_map_file {
> > > * @vdev: vdpa device
> > > * @idx: virtqueue index
> > > * Returns the irq affinity mask
> > > + * @set_irq_affinity: Pass the irq affinity hint (best effort)
> >
> > Note that this could easily confuse the users. I wonder if we can
> > unify it with set_irq_affinity. Looking at vduse's implementation, it
> > should be possible.
> >
>
> Do you mean unify set_irq_affinity() with set_vq_affinity()? Actually
> I didn't get how to achieve that. The set_vq_affinity() callback is
> called by virtio_config_ops.set_vq_affinity() but the set_irq_affinity
> is called by virtio_config_ops.find_vqs(), I don't know where to call
> the unified callback.
I meant, can we stick a single per vq affinity config ops then use
that in virtio-vpda's find_vqs() by something like:
masks = create_affinity_masks(dev->vq_num, desc);
for (i = 0; i < dev->vq_num; i++)
config->set_vq_affinity()
...
?
Thanks
>
> Thanks,
> Yongji
>
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