From 04846f903b53b32d29453e865646309db29f255a Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Tue, 23 Mar 2021 01:51:45 +0200 Subject: net: bridge: add helper to replay port and local fdb entries When a switchdev port starts offloading a LAG that is already in a bridge and has an FDB entry pointing to it: ip link set bond0 master br0 bridge fdb add dev bond0 00:01:02:03:04:05 master static ip link set swp0 master bond0 the switchdev driver will have no idea that this FDB entry is there, because it missed the switchdev event emitted at its creation. Ido Schimmel pointed this out during a discussion about challenges with switchdev offloading of stacked interfaces between the physical port and the bridge, and recommended to just catch that condition and deny the CHANGEUPPER event: https://lore.kernel.org/netdev/20210210105949.GB287766@shredder.lan/ But in fact, we might need to deal with the hard thing anyway, which is to replay all FDB addresses relevant to this port, because it isn't just static FDB entries, but also local addresses (ones that are not forwarded but terminated by the bridge). There, we can't just say 'oh yeah, there was an upper already so I'm not joining that'. So, similar to the logic for replaying MDB entries, add a function that must be called by individual switchdev drivers and replays local FDB entries as well as ones pointing towards a bridge port. This time, we use the atomic switchdev notifier block, since that's what FDB entries expect for some reason. Reported-by: Ido Schimmel Signed-off-by: Vladimir Oltean Acked-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/bridge/br_fdb.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) (limited to 'net/bridge') diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index b7490237f3fc..698b79747d32 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -726,6 +726,56 @@ static inline size_t fdb_nlmsg_size(void) + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */ } +static int br_fdb_replay_one(struct notifier_block *nb, + struct net_bridge_fdb_entry *fdb, + struct net_device *dev) +{ + struct switchdev_notifier_fdb_info item; + int err; + + item.addr = fdb->key.addr.addr; + item.vid = fdb->key.vlan_id; + item.added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); + item.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags); + item.info.dev = dev; + + err = nb->notifier_call(nb, SWITCHDEV_FDB_ADD_TO_DEVICE, &item); + return notifier_to_errno(err); +} + +int br_fdb_replay(struct net_device *br_dev, struct net_device *dev, + struct notifier_block *nb) +{ + struct net_bridge_fdb_entry *fdb; + struct net_bridge *br; + int err = 0; + + if (!netif_is_bridge_master(br_dev) || !netif_is_bridge_port(dev)) + return -EINVAL; + + br = netdev_priv(br_dev); + + rcu_read_lock(); + + hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) { + struct net_bridge_port *dst = READ_ONCE(fdb->dst); + struct net_device *dst_dev; + + dst_dev = dst ? dst->dev : br->dev; + if (dst_dev != br_dev && dst_dev != dev) + continue; + + err = br_fdb_replay_one(nb, fdb, dst_dev); + if (err) + break; + } + + rcu_read_unlock(); + + return err; +} +EXPORT_SYMBOL_GPL(br_fdb_replay); + static void fdb_notify(struct net_bridge *br, const struct net_bridge_fdb_entry *fdb, int type, bool swdev_notify) -- cgit v1.2.3