Hello.
On 2/25/2016 2:09 PM, Paolo Abeni 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 <[email protected]>
---
v1 -> v2:
- fixed netdev_get_fwd_headroom()
- added netdev_set_rx_headroom() and netdev_reset_rx_headroom() helpers
---
include/linux/netdevice.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e52077f..8f53674 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.
+ * * int (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
It's *void* in the declaration.
+ * 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);
};
/**
[...]
MBR, Sergei
