Re: [PATCH 3/4] vdpa_sim: support vendor satistics

[Jason Wang <jasowang@xxxxxxxxxx>]

在 2022/12/21 21:34, Stefano Garzarella 写道:
> On Wed, Dec 21, 2022 at 02:16:51PM +0800, Jason Wang wrote:
>
> Little typo in the title s/satistics/statistics


Fixed.


> > This patch adds a new config ops callback to allow individual
> > simulator to implement the vendor stats callback.
> >
> > Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> > ---
> > drivers/vdpa/vdpa_sim/vdpa_sim.c | 13 +++++++++++++
> > drivers/vdpa/vdpa_sim/vdpa_sim.h |  3 +++
> > 2 files changed, 16 insertions(+)
> >
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c 
> > b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > index 55aaa023a6e2..02e892f819e7 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > @@ -426,6 +426,18 @@ static int vdpasim_get_vq_state(struct 
> > vdpa_device *vdpa, u16 idx,
> >     return 0;
> > }
> >
> > +static int vdpasim_get_vq_stats(struct vdpa_device *vdpa, u16 idx,
> > +                struct sk_buff *msg,
> > +                struct netlink_ext_ack *extack)
> > +{
> > +    struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> > +
> > +    if (vdpasim->dev_attr.get_stats)
> > +        return vdpasim->dev_attr.get_stats(vdpasim, idx,
> > +                           msg, extack);
> > +    return -EINVAL;
>
> Maybe -EOPNOTSUPP is better when the device doesn't support it.
> Like we do in vendor_stats_fill() in drivers/vdpa/vdpa.c

That's right.


> > +}
> > +
> > static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
> > {
> >     return VDPASIM_QUEUE_ALIGN;
> > @@ -710,6 +722,7 @@ static const struct vdpa_config_ops 
> > vdpasim_config_ops = {
> >     .set_vq_ready           = vdpasim_set_vq_ready,
> >     .get_vq_ready           = vdpasim_get_vq_ready,
> >     .set_vq_state           = vdpasim_set_vq_state,
> > +    .get_vendor_vq_stats    = vdpasim_get_vq_stats,
>
> Should we add this callback also in vdpasim_batch_config_ops?


Yes.

Thanks


> Thanks,
> Stefano
>
> >     .get_vq_state           = vdpasim_get_vq_state,
> >     .get_vq_align           = vdpasim_get_vq_align,
> >     .get_vq_group           = vdpasim_get_vq_group,
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h 
> > b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> > index 51c070a543f1..d2a08c0abad7 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> > @@ -48,6 +48,9 @@ struct vdpasim_dev_attr {
> >     work_func_t work_fn;
> >     void (*get_config)(struct vdpasim *vdpasim, void *config);
> >     void (*set_config)(struct vdpasim *vdpasim, const void *config);
> > +    int (*get_stats)(struct vdpasim *vdpasim, u16 idx,
> > +             struct sk_buff *msg,
> > +             struct netlink_ext_ack *extack);
> > };
> >
> > /* State of each vdpasim device */
> > --
> > 2.25.1

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