From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Abeni Subject: [PATCH net-next v3 0/5] bridge/ovs: avoid skb head copy on frame forwarding Date: Fri, 26 Feb 2016 10:45:36 +0100 Message-ID: Cc: "David S. Miller" , Stephen Hemminger , Pravin Shelar , Jesse Gross , Flavio Leitner , Hannes Frederic Sowa , Sergei Shtylyov To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:52547 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751832AbcBZJqD (ORCPT ); Fri, 26 Feb 2016 04:46:03 -0500 Sender: netdev-owner@vger.kernel.org List-ID: Currently, while when an OVS or Linux bridge is used to forward frames towards some tunnel device, a skb_head_copy() may occur if the ingress device do not provide enough headroom for the tx encapsulation. This patch series tries to address the issue implementing a new ndo operation to allow the master device to control the headroom used when allocating the skb on frame reception. Said operation is used by the Linux bridge to notify the bridged ports of needed_headroom changes, and similar bookkeeping and behaviour is also added to openvswitch, on a per datapath basis. Finally, the operation is implemented for veth and tun device, which give performance improvement in the 6-12% range when forwarding frames from said devices towards a vxlan tunnel. v2: - fix netdev_get_fwd_headroom() behaviour - remove some code duplication with the netdev_set_rx_headroom() and netdev_reset_rx_headroom() helpers - handle headroom reset on [v]port removal/deletion - initialize tun align to the old default value v3: - fix a comment typo Paolo Abeni (5): netdev: introduce ndo_set_rx_headroom bridge: notify enslaved devices of headroom changes ovs: propagate per dp max headroom to all vports net/tun: implement ndo_set_rx_headroom veth: implement ndo_set_rx_headroom drivers/net/tun.c | 17 ++++++++++++++- drivers/net/veth.c | 26 +++++++++++++++++++++++ include/linux/netdevice.h | 31 ++++++++++++++++++++++++++++ net/bridge/br_if.c | 37 +++++++++++++++++++++++++++++++-- net/openvswitch/datapath.c | 40 ++++++++++++++++++++++++++++++++++++ net/openvswitch/datapath.h | 4 ++++ net/openvswitch/vport-internal_dev.c | 10 ++++++++- 7 files changed, 161 insertions(+), 4 deletions(-) -- 1.8.3.1