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authorVladimir Oltean <vladimir.oltean@nxp.com>2021-06-29 17:06:54 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-29 10:46:23 -0700
commit3068d466a67ec96a6972f248f5c7a7b6763dbeb1 (patch)
tree574d7e40b13c85ab4ca64d9f0a53ed9fb0d5a458 /net
parent26ee7b06a4d3086a3751b69c14663ba6c6bbfe7f (diff)
net: dsa: sync static FDB entries on foreign interfaces to hardware
DSA is able to install FDB entries towards the CPU port for addresses which were dynamically learnt by the software bridge on foreign interfaces that are in the same bridge with a DSA switch interface. Since this behavior is opportunistic, it is guarded by the "assisted_learning_on_cpu_port" property which can be enabled by drivers and is not done automatically (since certain switches may support address learning of packets coming from the CPU port). But if those FDB entries added on the foreign interfaces are static (added by the user) instead of dynamically learnt, currently DSA does not do anything (and arguably it should). Because static FDB entries are not supposed to move on their own, there is no downside in reusing the "assisted_learning_on_cpu_port" logic to sync static FDB entries to the DSA CPU port unconditionally, even if assisted_learning_on_cpu_port is not requested by the driver. For example, this situation: br0 / \ swp0 dummy0 $ bridge fdb add 02:00:de:ad:00:01 dev dummy0 vlan 1 master static Results in DSA adding an entry in the hardware FDB, pointing this address towards the CPU port. The same is true for entries added to the bridge itself, e.g: $ bridge fdb add 02:00:de:ad:00:01 dev br0 vlan 1 self local (except that right now, DSA still ignores 'local' FDB entries, this will be changed in a later patch) Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/dsa/slave.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index ac7f4f200ab1..ea9a7c1ce83e 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2403,9 +2403,12 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
dp = dsa_slave_to_port(dev);
} else {
- /* Snoop addresses learnt on foreign interfaces
- * bridged with us, for switches that don't
- * automatically learn SA from CPU-injected traffic
+ /* Snoop addresses added to foreign interfaces
+ * bridged with us, or the bridge
+ * itself. Dynamically learned addresses can
+ * also be added for switches that don't
+ * automatically learn SA from CPU-injected
+ * traffic.
*/
struct net_device *br_dev;
struct dsa_slave_priv *p;
@@ -2424,7 +2427,8 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
dp = p->dp;
host_addr = true;
- if (!dp->ds->assisted_learning_on_cpu_port)
+ if (!fdb_info->added_by_user &&
+ !dp->ds->assisted_learning_on_cpu_port)
return NOTIFY_DONE;
/* When the bridge learns an address on an offloaded