netdev - Re: [PATCH v3 virtio 6/8] pds_vdpa: add support for vdpa and vdpamgmt interfaces

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Date:   Mon, 27 Mar 2023 22:55:40 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        brett.creeley@....com, davem@...emloft.net, netdev@...r.kernel.org,
        kuba@...nel.org, drivers@...sando.io
Subject: Re: [PATCH v3 virtio 6/8] pds_vdpa: add support for vdpa and vdpamgmt
 interfaces

On 3/27/23 8:53 PM, Jason Wang wrote:
> On Sat, Mar 25, 2023 at 8:27 AM Shannon Nelson <shannon.nelson@....com> wrote:
>>
>> On 3/22/23 10:18 PM, Jason Wang wrote:
>>> On Thu, Mar 23, 2023 at 3:11 AM Shannon Nelson <shannon.nelson@....com> wrote:
>>>>
>>>> This is the vDPA device support, where we advertise that we can
>>>> support the virtio queues and deal with the configuration work
>>>> through the pds_core's adminq.
>>>>
>>>> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
>>>> ---
>>>>    drivers/vdpa/pds/aux_drv.c  |  15 +
>>>>    drivers/vdpa/pds/aux_drv.h  |   1 +
>>>>    drivers/vdpa/pds/debugfs.c  | 260 +++++++++++++++++
>>>>    drivers/vdpa/pds/debugfs.h  |  10 +
>>>>    drivers/vdpa/pds/vdpa_dev.c | 560 +++++++++++++++++++++++++++++++++++-
>>>>    5 files changed, 845 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
>>>> index 8f3ae3326885..e54f0371c60e 100644
>>>> --- a/drivers/vdpa/pds/aux_drv.c
>>>> +++ b/drivers/vdpa/pds/aux_drv.c
>>>
>>> [...]
>>>
>>>> +
>>>> +static struct vdpa_notification_area
>>>> +pds_vdpa_get_vq_notification(struct vdpa_device *vdpa_dev, u16 qid)
>>>> +{
>>>> +       struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
>>>> +       struct virtio_pci_modern_device *vd_mdev;
>>>> +       struct vdpa_notification_area area;
>>>> +
>>>> +       area.addr = pdsv->vqs[qid].notify_pa;
>>>> +
>>>> +       vd_mdev = &pdsv->vdpa_aux->vd_mdev;
>>>> +       if (!vd_mdev->notify_offset_multiplier)
>>>> +               area.size = PDS_PAGE_SIZE;
>>>
>>> This hasn't been defined so far? Others look good.
>>
>> Sorry, I don't understand your question.
>> sln
> 
> I mean I don't see the definition of PDS_PAGE_SIZE so far.
> 
> Thanks

Oh, right.  That's because it is defined in 
include/linux/pds/pds_common.h which comes from the pds_core patchset.

https://lore.kernel.org/netdev/20230324190243.27722-2-shannon.nelson@amd.com/

sln