From 10fae4ac89ce5c2ead6c6c35fd09651b5f97ae05 Mon Sep 17 00:00:00 2001 From: Tobias Waldekranz Date: Tue, 29 Jun 2021 17:06:55 +0300 Subject: [PATCH] net: dsa: include bridge addresses which are local in the host fdb list The bridge automatically creates local (not forwarded) fdb entries pointing towards physical ports with their interface MAC addresses. For switchdev, the significance of these fdb entries is the exact opposite of that of non-local entries: instead of sending these frame outwards, we must send them inwards (towards the host). NOTE: The bridge's own MAC address is also "local". If that address is not shared with any port, the bridge's MAC is not be added by this functionality - but the following commit takes care of that case. NOTE 2: We mark these addresses as host-filtered regardless of the value of ds->assisted_learning_on_cpu_port. This is because, as opposed to the speculative logic done for dynamic address learning on foreign interfaces, the local FDB entries are rather fixed, so there isn't any risk of them migrating from one bridge port to another. Signed-off-by: Tobias Waldekranz Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- net/dsa/slave.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/net/dsa/slave.c b/net/dsa/slave.c index ea9a7c1ce83eb2..d006bd04f84a43 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -2398,10 +2398,12 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused, fdb_info = ptr; if (dsa_slave_dev_check(dev)) { - if (!fdb_info->added_by_user || fdb_info->is_local) - return NOTIFY_OK; - dp = dsa_slave_to_port(dev); + + if (fdb_info->is_local) + host_addr = true; + else if (!fdb_info->added_by_user) + return NOTIFY_OK; } else { /* Snoop addresses added to foreign interfaces * bridged with us, or the bridge @@ -2425,9 +2427,15 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused, return NOTIFY_DONE; dp = p->dp; - host_addr = true; + host_addr = fdb_info->is_local; - if (!fdb_info->added_by_user && + /* FDB entries learned by the software bridge should + * be installed as host addresses only if the driver + * requests assisted learning. + * On the other hand, FDB entries for local termination + * should always be installed. + */ + if (!fdb_info->added_by_user && !fdb_info->is_local && !dp->ds->assisted_learning_on_cpu_port) return NOTIFY_DONE;