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

From: Jason Wang <jasowang@redhat.com>
To: Eli Cohen <elic@nvidia.com>,
	mst@redhat.com, virtualization@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] vdp/mlx5: Fix setting the correct dma_device
Date: Fri, 4 Jun 2021 10:35:59 +0800	[thread overview]
Message-ID: <864e8d21-22d4-7735-817b-f88ec0126f87@redhat.com> (raw)
In-Reply-To: <20210603112215.69259-1-elic@nvidia.com>

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.

> Signed-off-by: Eli Cohen <elic@nvidia.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;