From 6699af68e60e0d03671d1424a5f53258928b16d4 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Tue, 10 Aug 2010 11:23:02 -0700
Subject: [PATCH] learning-switch: Ignore "packet_in"s caused by
OFPP_CONTROLLER actions.
It seems best to ignore "packet_in"s caused by OFPP_CONTROLLER actions in
learning-switch, since someone might be experimenting and it's best not
to interfere with that.
---
lib/learning-switch.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/lib/learning-switch.c b/lib/learning-switch.c
index bca479ef2..88a8618c8 100644
--- a/lib/learning-switch.c
+++ b/lib/learning-switch.c
@@ -374,6 +374,13 @@ process_packet_in(struct lswitch *sw, struct rconn *rconn, void *opi_)
struct ofpbuf pkt;
flow_t flow;
+ /* Ignore packets sent via output to OFPP_CONTROLLER. This library never
+ * uses such an action. You never know what experiments might be going on,
+ * though, and it seems best not to interfere with them. */
+ if (opi->reason != OFPR_NO_MATCH) {
+ return;
+ }
+
/* Extract flow data from 'opi' into 'flow'. */
pkt_ofs = offsetof(struct ofp_packet_in, data);
pkt_len = ntohs(opi->header.length) - pkt_ofs;
--
2.47.0