[ovs-git] Open vSwitch: ofproto: Avoid buffer copy in OFPT_PACKET_IN path. (master)

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- Log -----------------------------------------------------------------
commit 43253595291318833572088595769b45a79c9c54
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=43253595291318833572088595769b45a79c9c54
Author: Ben Pfaff <blp at nicira.com>
		
ofproto: Avoid buffer copy in OFPT_PACKET_IN path.
		
When a dpif passes an odp_msg down to ofproto, and ofproto transforms it
into an ofp_packet_in to send to the controller, until now this always
involved a full copy of the packet inside ofproto.  This commit eliminates
this copy by ensuring that there is always enough headroom in the ofpbuf
that holds the odp_msg to replace it by an ofp_packet_in in-place.

>From Jean Tourrilhes <jt at hpl.hp.com>, with some revisions.


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Summary of changes:
 lib/dpif-linux.c    |    3 +-
 lib/dpif-netdev.c   |    3 +-
 lib/dpif-provider.h |   16 ++++++-
 lib/dpif.c          |    7 ++-
 ofproto/ofproto.c   |  123 ++++++++++++++++++++++++++++++++++++++------------
 5 files changed, 116 insertions(+), 36 deletions(-)


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