netdev - Re: [PATCH V6 8/8] virtio: Intel IFC VF driver for VDPA

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Message-ID: <20200318122255.GG13183@mellanox.com>
Date:   Wed, 18 Mar 2020 09:22:55 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        maxime.coquelin@...hat.com, cunming.liang@...el.com,
        zhihong.wang@...el.com, rob.miller@...adcom.com,
        xiao.w.wang@...el.com, lingshan.zhu@...el.com, eperezma@...hat.com,
        lulu@...hat.com, parav@...lanox.com, kevin.tian@...el.com,
        stefanha@...hat.com, rdunlap@...radead.org, hch@...radead.org,
        aadam@...hat.com, jiri@...lanox.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com, gdawar@...inx.com,
        saugatm@...inx.com, vmireyno@...vell.com,
        Bie Tiwei <tiwei.bie@...el.com>
Subject: Re: [PATCH V6 8/8] virtio: Intel IFC VF driver for VDPA

On Wed, Mar 18, 2020 at 04:03:27PM +0800, Jason Wang wrote:
> From: Zhu Lingshan <lingshan.zhu@...el.com>
> +
> +static int ifcvf_vdpa_attach(struct ifcvf_adapter *adapter)
> +{
> +	int ret;
> +
> +	adapter->vdpa_dev  = vdpa_alloc_device(adapter->dev, adapter->dev,
> +					       &ifc_vdpa_ops);
> +	if (IS_ERR(adapter->vdpa_dev)) {
> +		IFCVF_ERR(adapter->dev, "Failed to init ifcvf on vdpa bus");
> +		put_device(&adapter->vdpa_dev->dev);
> +		return -ENODEV;
> +	}

The point of having an alloc call is so that the drivers
ifcvf_adaptor memory could be placed in the same struct - eg use
container_of to flip between them, and have a kref for both memories.

It seem really weird to have an alloc followed immediately by
register.

> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> index c30eb55030be..de64b88ee7e4 100644
> +++ b/drivers/virtio/virtio_vdpa.c
> @@ -362,6 +362,7 @@ static int virtio_vdpa_probe(struct vdpa_device *vdpa)
>  		goto err;
>  
>  	vdpa_set_drvdata(vdpa, vd_dev);
> +	dev_info(vd_dev->vdev.dev.parent, "device attached to VDPA bus\n");
>  
>  	return 0;

This hunk seems out of place

Jason