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Commit 871b642a authored by Paolo Abeni's avatar Paolo Abeni Committed by David S. Miller
Browse files

netdev: introduce ndo_set_rx_headroom 



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: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 46d5efa9

include/linux/netdevice.h

+31 −0
Original line number Diff line number Diff line
@@ -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.

 * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);

 *	This function is used to specify the headroom that the skb must

 *	consider when allocation skb during packet reception. Setting

 *	appropriate rx headroom value allows avoiding skb head copy on

 *	forward. Setting a negative value reset the rx headroom to the

 *	default value.

 *

 */

struct net_device_ops {
@@ -1278,6 +1284,8 @@ struct net_device_ops { 
							 bool proto_down);

	int			(*ndo_fill_metadata_dst)(struct net_device *dev,

						       struct sk_buff *skb);

	void			(*ndo_set_rx_headroom)(struct net_device *dev,

						       int needed_headroom);

};



/**
@@ -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 +1948,26 @@ 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 ? 0 : dev->needed_headroom;

}



static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)

{

	if (dev->netdev_ops->ndo_set_rx_headroom)

		dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);

}



/* set the device rx headroom to the dev's default */

static inline void netdev_reset_rx_headroom(struct net_device *dev)

{

	netdev_set_rx_headroom(dev, -1);

}



/*

 * Net namespace inlines

 */