From 185c9a760a61b034abb01a2dac8174b7da6e7ce4 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Tue, 23 Mar 2021 01:51:47 +0200 Subject: net: dsa: call dsa_port_bridge_join when joining a LAG that is already in a bridge DSA can properly detect and offload this sequence of operations: ip link add br0 type bridge ip link add bond0 type bond ip link set swp0 master bond0 ip link set bond0 master br0 But not this one: ip link add br0 type bridge ip link add bond0 type bond ip link set bond0 master br0 ip link set swp0 master bond0 Actually the second one is more complicated, due to the elapsed time between the enslavement of bond0 and the offloading of it via swp0, a lot of things could have happened to the bond0 bridge port in terms of switchdev objects (host MDBs, VLANs, altered STP state etc). So this is a bit of a can of worms, and making sure that the DSA port's state is in sync with this already existing bridge port is handled in the next patches. Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli Reviewed-by: Tobias Waldekranz Signed-off-by: David S. Miller --- net/dsa/port.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) (limited to 'net/dsa') diff --git a/net/dsa/port.c b/net/dsa/port.c index c9c6d7ab3f47..d39262a9fe0e 100644 --- a/net/dsa/port.c +++ b/net/dsa/port.c @@ -249,17 +249,31 @@ int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag, .lag = lag, .info = uinfo, }; + struct net_device *bridge_dev; int err; dsa_lag_map(dp->ds->dst, lag); dp->lag_dev = lag; err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info); - if (err) { - dp->lag_dev = NULL; - dsa_lag_unmap(dp->ds->dst, lag); - } + if (err) + goto err_lag_join; + bridge_dev = netdev_master_upper_dev_get(lag); + if (!bridge_dev || !netif_is_bridge_master(bridge_dev)) + return 0; + + err = dsa_port_bridge_join(dp, bridge_dev); + if (err) + goto err_bridge_join; + + return 0; + +err_bridge_join: + dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info); +err_lag_join: + dp->lag_dev = NULL; + dsa_lag_unmap(dp->ds->dst, lag); return err; } -- cgit v1.2.3