[ovs-dev] [PATCH 08/17] rstp-state-machines: fix TCN reception.

[Daniele Venturino]

        Set rcdv_tcn and return OTHER_INFO when a
        TOPOLOGY_CHANGE_NOTIFICATION_BPDU is received.

Signed-off-by: Daniele Venturino <daniele.venturino at m3s.it>
---
 lib/rstp-state-machines.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/rstp-state-machines.c b/lib/rstp-state-machines.c
index 5398f12..13abec0 100644
--- a/lib/rstp-state-machines.c
+++ b/lib/rstp-state-machines.c
@@ -1029,6 +1029,14 @@ rcv_info(struct rstp_port *p)
     role =
         (p->received_bpdu_buffer.flags & ROLE_FLAG_MASK) >> ROLE_FLAG_SHIFT;
 
+    /* 802.1D-2004 does not report this behaviour.
+     * 802.1Q-2008 says set rcvdTcn. */
+    if (p->received_bpdu_buffer.bpdu_type ==
+            TOPOLOGY_CHANGE_NOTIFICATION_BPDU) {
+        p->rcvd_tcn = true;
+        return OTHER_INFO;
+    }
+
     /* Returns SuperiorDesignatedInfo if:
      * a) The received message conveys a Designated Port Role, and
      *  1) The message priority is superior (17.6) to the Port.s port priority
-- 
1.8.1.2