net: dsa: felix: program host FDB entries towards PGID_CPU for tag_8021q too

I remembered why we had the host FDB migration procedure in place.

It is true that host FDB entry migration can be done by changing the
value of PGID_CPU, but the problem is that only host FDB entries learned
while operating in NPI mode go to PGID_CPU. When the CPU port operates
in tag_8021q mode, the FDB entries are learned towards the unicast PGID
equal to the physical port number of this CPU port, bypassing the
PGID_CPU indirection.

So host FDB entries learned in tag_8021q mode are not migrated any
longer towards the NPI port.

Fix this by extracting the NPI port -> PGID_CPU redirection from the
ocelot switch lib, moving it to the Felix DSA driver, and applying it
for any CPU port regardless of its kind (NPI or tag_8021q).

Fixes: a51c1c3f3218 ("net: dsa: felix: stop migrating FDBs back and forth on tag proto change")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index a23781d..5af4f9b 100644 (file)
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -668,15 +668,19 @@ static int felix_fdb_add(struct dsa_switch *ds, int port,
                         struct dsa_db db)
 {
        struct net_device *bridge_dev = felix_classify_db(db);
+       struct dsa_port *dp = dsa_to_port(ds, port);
        struct ocelot *ocelot = ds->priv;
 
        if (IS_ERR(bridge_dev))
                return PTR_ERR(bridge_dev);
 
-       if (dsa_is_cpu_port(ds, port) && !bridge_dev &&
+       if (dsa_port_is_cpu(dp) && !bridge_dev &&
            dsa_fdb_present_in_other_db(ds, port, addr, vid, db))
                return 0;
 
+       if (dsa_port_is_cpu(dp))
+               port = PGID_CPU;
+
        return ocelot_fdb_add(ocelot, port, addr, vid, bridge_dev);
 }
 
@@ -685,15 +689,19 @@ static int felix_fdb_del(struct dsa_switch *ds, int port,
                         struct dsa_db db)
 {
        struct net_device *bridge_dev = felix_classify_db(db);
+       struct dsa_port *dp = dsa_to_port(ds, port);
        struct ocelot *ocelot = ds->priv;
 
        if (IS_ERR(bridge_dev))
                return PTR_ERR(bridge_dev);
 
-       if (dsa_is_cpu_port(ds, port) && !bridge_dev &&
+       if (dsa_port_is_cpu(dp) && !bridge_dev &&
            dsa_fdb_present_in_other_db(ds, port, addr, vid, db))
                return 0;
 
+       if (dsa_port_is_cpu(dp))
+               port = PGID_CPU;
+
        return ocelot_fdb_del(ocelot, port, addr, vid, bridge_dev);
 }
 

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 5f81938..7a9ee91 100644 (file)
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1349,15 +1349,10 @@ EXPORT_SYMBOL(ocelot_drain_cpu_queue);
 int ocelot_fdb_add(struct ocelot *ocelot, int port, const unsigned char *addr,
                   u16 vid, const struct net_device *bridge)
 {
-       int pgid = port;
-
-       if (port == ocelot->npi)
-               pgid = PGID_CPU;
-
        if (!vid)
                vid = ocelot_vlan_unaware_pvid(ocelot, bridge);
 
-       return ocelot_mact_learn(ocelot, pgid, addr, vid, ENTRYTYPE_LOCKED);
+       return ocelot_mact_learn(ocelot, port, addr, vid, ENTRYTYPE_LOCKED);
 }
 EXPORT_SYMBOL(ocelot_fdb_add);