Re: [RFC PATCH 1/2] move virtnet_send_command() above virtnet_set_mac_address()

[Jason Wang <jasowang@redhat.com>]

On 01/10/2013 10:45 PM, akong@redhat.com wrote:
> From: Amos Kong <akong@redhat.com>
>
> We will send vq command to set mac address in virtnet_set_mac_address()
> a little fix of coding style

Maybe what you need is just a forward declaration.
>
> Signed-off-by: Amos Kong <akong@redhat.com>
> ---
>  drivers/net/virtio_net.c | 89 ++++++++++++++++++++++++------------------------
>  1 file changed, 44 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a6fcf15..395ab4f 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -753,6 +753,50 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
>  	return NETDEV_TX_OK;
>  }
>  
> +/*
> + * Send command via the control virtqueue and check status.  Commands
> + * supported by the hypervisor, as indicated by feature bits, should
> + * never fail unless improperly formated.
> + */
> +static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
> +				 struct scatterlist *data, int out, int in)
> +{
> +	struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
> +	struct virtio_net_ctrl_hdr ctrl;
> +	virtio_net_ctrl_ack status = ~0;
> +	unsigned int tmp;
> +	int i;
> +
> +	/* Caller should know better */
> +	BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
> +		(out + in > VIRTNET_SEND_COMMAND_SG_MAX));
> +
> +	out++; /* Add header */
> +	in++; /* Add return status */
> +
> +	ctrl.class = class;
> +	ctrl.cmd = cmd;
> +
> +	sg_init_table(sg, out + in);
> +
> +	sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
> +	for_each_sg(data, s, out + in - 2, i)
> +		sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
> +	sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
> +
> +	BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
> +
> +	virtqueue_kick(vi->cvq);
> +
> +	/* Spin for a response, the kick causes an ioport write, trapping
> +	 * into the hypervisor, so the request should be handled immediately.
> +	 */
> +	while (!virtqueue_get_buf(vi->cvq, &tmp))
> +		cpu_relax();
> +
> +	return status == VIRTIO_NET_OK;
> +}
> +
>  static int virtnet_set_mac_address(struct net_device *dev, void *p)
>  {
>  	struct virtnet_info *vi = netdev_priv(dev);
> @@ -819,51 +863,6 @@ static void virtnet_netpoll(struct net_device *dev)
>  }
>  #endif
>  
> -/*
> - * Send command via the control virtqueue and check status.  Commands
> - * supported by the hypervisor, as indicated by feature bits, should
> - * never fail unless improperly formated.
> - */
> -static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
> -				 struct scatterlist *data, int out, int in)
> -{
> -	struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
> -	struct virtio_net_ctrl_hdr ctrl;
> -	virtio_net_ctrl_ack status = ~0;
> -	unsigned int tmp;
> -	int i;
> -
> -	/* Caller should know better */
> -	BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
> -		(out + in > VIRTNET_SEND_COMMAND_SG_MAX));
> -
> -	out++; /* Add header */
> -	in++; /* Add return status */
> -
> -	ctrl.class = class;
> -	ctrl.cmd = cmd;
> -
> -	sg_init_table(sg, out + in);
> -
> -	sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
> -	for_each_sg(data, s, out + in - 2, i)
> -		sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
> -	sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
> -
> -	BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
> -
> -	virtqueue_kick(vi->cvq);
> -
> -	/*
> -	 * Spin for a response, the kick causes an ioport write, trapping
> -	 * into the hypervisor, so the request should be handled immediately.
> -	 */
> -	while (!virtqueue_get_buf(vi->cvq, &tmp))
> -		cpu_relax();
> -
> -	return status == VIRTIO_NET_OK;
> -}
> -
>  static void virtnet_ack_link_announce(struct virtnet_info *vi)
>  {
>  	rtnl_lock();