linux-kernel - Re: [PATCH V3 3/3] vDPA/ifcvf: get_config_size should return dev specific config size

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Date:   Fri, 16 Apr 2021 10:47:38 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>
Cc:     jasowang@...hat.com, mst@...hat.com, lulu@...hat.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 3/3] vDPA/ifcvf: get_config_size should return dev
 specific config size

On Fri, Apr 16, 2021 at 03:16:28PM +0800, Zhu Lingshan wrote:
>get_config_size() should return the size based on the decected
>device type.
>
>Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>---
> drivers/vdpa/ifcvf/ifcvf_main.c | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
>index 376b2014916a..3b6f7862dbb8 100644
>--- a/drivers/vdpa/ifcvf/ifcvf_main.c
>+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
>@@ -356,7 +356,24 @@ static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
>
> static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
> {
>-	return sizeof(struct virtio_net_config);
>+	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
>+	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
>+	struct pci_dev *pdev = adapter->pdev;
>+	size_t size;
>+
>+	switch (vf->dev_type) {
>+	case VIRTIO_ID_NET:
>+		size = sizeof(struct virtio_net_config);
>+		break;
>+	case VIRTIO_ID_BLOCK:
>+		size = sizeof(struct virtio_blk_config);
>+		break;
>+	default:
>+		size = 0;
>+		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
>+	}
>+
>+	return size;
> }
>
> static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
>-- 
>2.27.0
>