linux-kernel - RE: [PATCH RFC 1/4] virtio

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Date:	Fri, 24 Oct 2014 10:02:15 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	"'Michael S. Tsirkin'" <mst@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"cornelia.huck@...ibm.com" <cornelia.huck@...ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH RFC 1/4] virtio_net: pass vi around

From: Michael S. Tsirkin
 
> Too many places poke at [rs]q->vq->vdev->priv just to get
> the the vi structure.  Let's just pass the pointer around: seems
> cleaner, and might even be faster.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/net/virtio_net.c | 36 +++++++++++++++++++-----------------
>  1 file changed, 19 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 57cbc7d..36f3dfc 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
...
>  static struct sk_buff *receive_big(struct net_device *dev,
> +				   struct virtnet_info *vi,

Do you need to pass 'dev' here?
Looks like it is obtainable from vi->dev (as below).

	David

>  				   struct receive_queue *rq,
>  				   void *buf,
>  				   unsigned int len)
>  {
>  	struct page *page = buf;
> -	struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
> +	struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
...
> -static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
> +static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
> +			void *buf, unsigned int len)
>  {
> -	struct virtnet_info *vi = rq->vq->vdev->priv;
>  	struct net_device *dev = vi->dev;
...


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