diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2016-02-26 10:45:37 +0100 |
|---|---|---|
| committer | Georg Veichtlbauer <georg@vware.at> | 2023-11-02 10:58:57 +0100 |
| commit | f55efe5b761076743338418a1f888cb4ef2ff137 (patch) | |
| tree | c7ff94a9a57161f71cc443516b6d98405ef94325 | |
| parent | 04a3e74655c1e55899196636abf65c39ef984ccc (diff) | |
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.
Change-Id: Ic4938a247408a87538a11c45e3fbc2031f4ac832
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/netdevice.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 5a8cc1a236d6..f8fcdc3fd7b6 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1059,6 +1059,12 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev, * 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 { @@ -1236,6 +1242,8 @@ 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); }; /** @@ -1273,6 +1281,8 @@ 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, @@ -1301,6 +1311,7 @@ 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 @@ -1896,6 +1907,26 @@ 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 */ |