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net: dsa: don't fast age bridge ports with learning turned off

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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>
This commit is contained in:
Vladimir Oltean 2021-08-08 17:35:24 +03:00 committed by David S. Miller
parent 045c45d1f5
commit 4eab90d973
1 changed files with 1 additions and 1 deletions
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2
net/dsa/port.c
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@ -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.