netdev - Re: [Patch v2 net-next] veth: add netpoll support

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Date:	Tue, 24 Jun 2014 07:07:15 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev@...r.kernel.org, Stefan Priebe <s.priebe@...fihost.ag>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch v2 net-next] veth: add netpoll support

On Mon, Jun 23, 2014 at 03:36:02PM -0700, Cong Wang wrote:
> It is trivial to add netpoll support to veth, since
> it is not a stacked device, we don't need to setup and
> clean up netpoll.
> 
> Reported-by: Stefan Priebe <s.priebe@...fihost.ag>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Neil Horman <nhorman@...driver.com>
> Acked-by: Neil Horman <nhorman@...driver.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---
>  drivers/net/veth.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index b4a10bc..9b945e6 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -248,6 +248,21 @@ static void veth_dev_free(struct net_device *dev)
>  	free_netdev(dev);
>  }
>  
> +#ifdef CONFIG_NET_POLL_CONTROLLER
> +static void veth_poll_controller(struct net_device *dev)
> +{
> +	/* veth only receives frames when its peer sends one
> +	 * Since it's a synchronous operation, we are guaranteed
> +	 * never to have pending data when we poll for it so
> +	 * there is nothing to do here.
> +	 *
> +	 * We need this though so netpoll recognizes us as an interface that
> +	 * supports polling, which enables bridge devices in virt setups to
> +	 * still use netconsole
> +	 */
> +}
> +#endif	/* CONFIG_NET_POLL_CONTROLLER */
> +
>  static const struct net_device_ops veth_netdev_ops = {
>  	.ndo_init            = veth_dev_init,
>  	.ndo_open            = veth_open,
> @@ -257,6 +272,9 @@ static const struct net_device_ops veth_netdev_ops = {
>  	.ndo_get_stats64     = veth_get_stats64,
>  	.ndo_set_rx_mode     = veth_set_multicast_list,
>  	.ndo_set_mac_address = eth_mac_addr,
> +#ifdef CONFIG_NET_POLL_CONTROLLER
> +	.ndo_poll_controller	= veth_poll_controller,
> +#endif
>  };
>  
>  #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |    \
> -- 
> 1.8.3.1
> 
> 

Acked-by: Neil Horman <nhorman@...driver.com>

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