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ofproto: Avoid buffer copy in OFPT_PACKET_IN path.

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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@hpl.hp.com>, with some revisions.
This commit is contained in:
Ben Pfaff
2010-04-27 09:40:46 -07:00
parent 1f256c11cd
commit 4325359529
5 changed files with 123 additions and 43 deletions
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3
lib/dpif-linux.c
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@@ -460,7 +460,8 @@ dpif_linux_recv(struct dpif *dpif_, struct ofpbuf **bufp)
int retval;
int error;
buf = ofpbuf_new(65536);
buf = ofpbuf_new(65536 + DPIF_RECV_MSG_PADDING);
ofpbuf_reserve(buf, DPIF_RECV_MSG_PADDING);
retval = read(dpif->fd, ofpbuf_tail(buf), ofpbuf_tailroom(buf));
if (retval < 0) {
error = errno;