linux-kernel - Re: [PATCH V5 7/7] vDPA/ifcvf: deduce VIRTIO device ID from pdev ids

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Date:   Thu, 18 Mar 2021 10:44:37 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com,
        lulu@...hat.com, leonro@...dia.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 7/7] vDPA/ifcvf: deduce VIRTIO device ID from pdev ids


在 2021/3/17 下午5:49, Zhu Lingshan 写道:
> This commit deduces the VIRTIO device ID of a probed
> device from its pdev device ids.
>
> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
> ---
>   drivers/vdpa/ifcvf/ifcvf_base.h |  1 +
>   drivers/vdpa/ifcvf/ifcvf_main.c | 14 +++++++++++++-
>   2 files changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
> index f77239fc1644..b2eeb16b9c2c 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_base.h
> +++ b/drivers/vdpa/ifcvf/ifcvf_base.h
> @@ -127,4 +127,5 @@ int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features);
>   u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
>   int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
>   struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);
> +int ifcvf_probed_virtio_net(struct ifcvf_hw *hw);
>   #endif /* _IFCVF_H_ */
> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> index ea93ea7fd5df..9fade400b5a4 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> @@ -323,7 +323,19 @@ static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
>   
>   static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
>   {
> -	return VIRTIO_ID_NET;
> +	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
> +	struct pci_dev *pdev = adapter->pdev;
> +	u32 ret = -ENODEV;
> +
> +	if (pdev->device < 0x1000 || pdev->device > 0x107f)
> +		return ret;
> +
> +	if (pdev->device < 0x1040)
> +		ret =  pdev->subsystem_device;
> +	else
> +		ret =  pdev->device - 0x1040;
> +
> +	return ret;
>   }


It would be better to keep the comment.

But anyway

Acked-by: Jason Wang <jasowang@...hat.com>



>   
>   static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)