netdev - Re: [PATCH net-next 1/5] netdev: introduce ndo_set_rx

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Date:	Tue, 23 Feb 2016 11:20:31 -0800
From:	pravin shelar <pshelar@....org>
To:	Paolo Abeni <pabeni@...hat.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Pravin Shelar <pshelar@...ira.com>,
	Jesse Gross <jesse@...nel.org>,
	Flavio Leitner <fbl@...close.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next 1/5] netdev: introduce ndo_set_rx_headroom

On Tue, Feb 23, 2016 at 4:53 AM, Paolo Abeni <pabeni@...hat.com> wrote:
> This method allows the controlling device (i.e. the bridge) to specify
> additional headroom to be allocated for skb head on frame reception.
>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
>  include/linux/netdevice.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 47671ce0..fb74277 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1093,6 +1093,12 @@ struct tc_to_netdev {
>   *     This function is used to get egress tunnel information for given skb.
>   *     This is useful for retrieving outer tunnel header parameters while
>   *     sampling packet.
...

>  /**
> @@ -1315,6 +1323,8 @@ struct net_device_ops {
>   * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
>   * @IFF_TEAM: device is a team device
>   * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
> + * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
> + *     entity (i.e. the master device for bridged veth)
>   */
>  enum netdev_priv_flags {
>         IFF_802_1Q_VLAN                 = 1<<0,
> @@ -1343,6 +1353,7 @@ enum netdev_priv_flags {
>         IFF_L3MDEV_SLAVE                = 1<<23,
>         IFF_TEAM                        = 1<<24,
>         IFF_RXFH_CONFIGURED             = 1<<25,
> +       IFF_PHONY_HEADROOM              = 1<<26,
>  };
>
>  #define IFF_802_1Q_VLAN                        IFF_802_1Q_VLAN
> @@ -1937,6 +1948,15 @@ struct netdev_queue *netdev_pick_tx(struct net_device *dev,
>                                     struct sk_buff *skb,
>                                     void *accel_priv);
>
> +/* returns the headroom that the master device needs to take in account
> + * when forwarding to this dev
> + */
> +static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
> +{
> +       return (dev->priv_flags && IFF_PHONY_HEADROOM) ? dev->needed_headroom :
> +               0;
> +}
> +
This looks like typo. It should '&' to check for the bitfield.