From 4eab90d9737b348094a99ba4e4c473e91a8b8038 Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: Sun, 8 Aug 2021 17:35:24 +0300
Subject: [PATCH] net: dsa: don't fast age bridge ports with learning turned
off
On topology changes, stations that were dynamically learned on ports
that are no longer part of the active topology must be flushed - this is
described by clause "17.11 Updating learned station location information"
of IEEE 802.1D-2004.
However, when address learning on the bridge port is turned off in the
first place, there is nothing to flush, so skip a potentially expensive
operation.
We can finally do this now since DSA is aware of the learning state of
its bridged ports.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/dsa/port.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/dsa/port.c b/net/dsa/port.c
index d6a35a03acd61..a4c8d19a76e2d 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -50,7 +50,7 @@ int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
ds->ops->port_stp_state_set(ds, port, state);
- if (do_fast_age) {
+ if (do_fast_age && dp->learning) {
/* Fast age FDB entries or flush appropriate forwarding database
* for the given port, if we are moving it from Learning or
* Forwarding state, to Disabled or Blocking or Listening state.
--
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