netdev - Re: [net-next RFC PATCH 5/5] virtio-net: flow director support

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Message-ID: <CAJSP0QXfHC8j2Kk9x6wyBMubo2=YvpaLAShJtwMWA2mtro6UhA@mail.gmail.com>
Date:	Mon, 5 Dec 2011 10:55:13 +0000
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	krkumar2@...ibm.com, kvm@...r.kernel.org, mst@...hat.com,
	netdev@...r.kernel.org, rusty@...tcorp.com.au,
	virtualization@...ts.linux-foundation.org, levinsasha928@...il.com,
	bhutchings@...arflare.com
Subject: Re: [net-next RFC PATCH 5/5] virtio-net: flow director support

On Mon, Dec 5, 2011 at 8:59 AM, Jason Wang <jasowang@...hat.com> wrote:
> +static int virtnet_set_fd(struct net_device *dev, u32 pfn)
> +{
> +       struct virtnet_info *vi = netdev_priv(dev);
> +       struct virtio_device *vdev = vi->vdev;
> +
> +       if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_FD)) {
> +               vdev->config->set(vdev,
> +                                 offsetof(struct virtio_net_config_fd, addr),
> +                                 &pfn, sizeof(u32));

Please use the virtio model (i.e. virtqueues) instead of shared
memory.  Mapping a page breaks the virtio abstraction.

Stefan
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