linux-kernel - Re: [PATCH] vdp/mlx5: Fix setting the correct dma_device

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Message-ID: <YLpNc5WsBWQ5f4cl@unreal>
Date:   Fri, 4 Jun 2021 18:57:39 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Eli Cohen <elic@...dia.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vdp/mlx5: Fix setting the correct dma_device

On Fri, Jun 04, 2021 at 10:35:59AM +0800, Jason Wang wrote:
> 
> 在 2021/6/3 下午7:22, Eli Cohen 写道:
> > Before SF support was introduced, the DMA device was equal to
> > mdev->device which was in essence equal to pdev->dev;
> > With SF introduction this is no longer true. It has already been
> > handled for vhost_vdpa since the reference to the dma device can from
> > within mlx5_vdpa. With virtio_vdpa this broke. To fix this we set the
> > real dma device when initializing the device.
> > 
> > Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
> 
> 
> Note sure this is correct, according to the commit log it should be the
> patch that introduces the SF or aux bus support for vDPA.

Where did you see that?

git log -p drivers/vdpa/mlx5/net/mlx5_vnet.c

...
+       mvdev->vdev.dma_dev = mdev->device;
+       err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
...
 comes from commit 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")

Thanks

> 
> 
> > Signed-off-by: Eli Cohen <elic@...dia.com>
> 
> 
> Patch looks correct.
> 
> Thanks
> 
> 
> > ---
> >   drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index bc33f2c523d3..a4ff158181e0 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -2046,7 +2046,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name)
> >   	if (err)
> >   		goto err_mtu;
> > -	mvdev->vdev.dma_dev = mdev->device;
> > +	mvdev->vdev.dma_dev = &mdev->pdev->dev;
> >   	err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
> >   	if (err)
> >   		goto err_mtu;
> 
> _______________________________________________
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> Virtualization@...ts.linux-foundation.org
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