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

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Message-ID: <11aa3331-a262-bc97-193c-d1c9a9214541@redhat.com>
Date:   Thu, 22 Dec 2022 12:19:17 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     mst@...hat.com, eperezma@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] vdpa_sim: support vendor satistics


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@...hat.com>
>> ---
>> 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
>>
>