From: Jason Gunthorpe <jgg@mellanox.com>
To: Jason Wang <jasowang@redhat.com>
Cc: "mst@redhat.com" <mst@redhat.com>,
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Subject: Re: [PATCH V4 5/5] vdpasim: vDPA device simulator
Date: Wed, 26 Feb 2020 13:19:05 -0400 [thread overview]
Message-ID: <20200226171905.GS26318@mellanox.com> (raw)
In-Reply-To: <793a1b81-4f78-c405-4aae-f32a2bf67d87@redhat.com>
On Wed, Feb 26, 2020 at 02:12:26PM +0800, Jason Wang wrote:
> > > It is a bit weird to be creating this dummy parent, couldn't this be
> > > done by just passing a NULL parent to vdpa_alloc_device, doing
> > > set_dma_ops() on the vdpasim->vdpa->dev and setting dma_device to
> > > vdpasim->vdpa->dev ?
> >
> >
> > I think it works.
>
>
> Rethink about this, since most hardware vDPA driver will have a parent and
> will use it to find the parent structure e.g
>
> dev_get_drvdata(vdpa->dev->parent)
Oh that seems like a sketchy pattern
> So I keep this dummy parent in V5.
The dummy parent is visible in sysfs, I think you should remove it so
the syfs for this virtual device makes sense.
Jason
next prev parent reply other threads:[~2020-02-26 17:19 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 6:11 [PATCH V4 0/5] vDPA support Jason Wang
2020-02-20 6:11 ` [PATCH V4 1/5] vhost: factor out IOTLB Jason Wang
2020-02-20 6:11 ` [PATCH V4 2/5] vringh: IOTLB support Jason Wang
2020-02-20 6:11 ` [PATCH V4 3/5] vDPA: introduce vDPA bus Jason Wang
2020-02-20 15:14 ` Jason Gunthorpe
2020-02-21 7:54 ` Jason Wang
2020-02-24 6:14 ` Harpreet Singh Anand
2020-02-24 6:48 ` Jason Wang
2020-02-20 6:11 ` [PATCH V4 4/5] virtio: introduce a vDPA based transport Jason Wang
2020-02-20 15:19 ` Jason Gunthorpe
2020-02-21 8:06 ` Jason Wang
2020-02-20 6:11 ` [PATCH V4 5/5] vdpasim: vDPA device simulator Jason Wang
2020-02-20 15:12 ` Jason Gunthorpe
2020-02-21 7:57 ` Jason Wang
2020-02-26 6:12 ` Jason Wang
2020-02-26 17:19 ` Jason Gunthorpe [this message]
2020-02-21 8:33 ` Harpreet Singh Anand
2020-02-21 8:50 ` Jason Wang
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