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netdev: introduce ndo_set_rx_headroom

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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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2016-02-26 10:45:37 +01:00 committed by David S. Miller
parent 46d5efa9a6
commit 871b642ade
1 changed files with 31 additions and 0 deletions
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31
include/linux/netdevice.h
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@ -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
*/