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net: dsa: still fast-age ports joining a bridge if they can't configure learning

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Commit 39f3210154 ("net: dsa: don't fast age standalone ports")
assumed that all standalone ports disable address learning, but if the
switch driver implements .port_fast_age but not .port_bridge_flags (like
ksz9477, ksz8795, lantiq_gswip, lan9303), then that might not actually
be true.

So whereas before, the bridge temporarily walking us through the
BLOCKING STP state meant that the standalone ports had a checkpoint to
flush their baggage and start fresh when they join a bridge, after that
commit they no longer do.

Restore the old behavior for these drivers by checking if the switch can
toggle address learning. If it can't, disregard the "do_fast_age"
argument and unconditionally perform fast ageing on STP state changes.

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 2021-08-09 01:56:48 +03:00 committed by David S. Miller
parent cfe908c116
commit a4ffe09fc2
1 changed files with 17 additions and 1 deletions
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18
net/dsa/port.c
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@ -60,6 +60,21 @@ static void dsa_port_fast_age(const struct dsa_port *dp)
dsa_port_notify_bridge_fdb_flush(dp);
}
static bool dsa_port_can_configure_learning(struct dsa_port *dp)
{
struct switchdev_brport_flags flags = {
.mask = BR_LEARNING,
};
struct dsa_switch *ds = dp->ds;
int err;
if (!ds->ops->port_bridge_flags || !ds->ops->port_pre_bridge_flags)
return false;
err = ds->ops->port_pre_bridge_flags(ds, dp->index, flags, NULL);
return !err;
}
int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
{
struct dsa_switch *ds = dp->ds;
@ -70,7 +85,8 @@ 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 && dp->learning) {
if (!dsa_port_can_configure_learning(dp) ||
(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.