@@ -2208,13 +2208,11 @@ mv88e6xxx_port_vlan_prepare(struct dsa_switch *ds, int port,
return err;
}
-static int mv88e6xxx_port_db_load_purge(struct mv88e6xxx_chip *chip, int port,
- const unsigned char *addr, u16 vid,
- u8 state)
+static int mv88e6xxx_port_db_get(struct mv88e6xxx_chip *chip,
+ const unsigned char *addr, u16 vid,
+ u16 *fid, struct mv88e6xxx_atu_entry *entry)
{
- struct mv88e6xxx_atu_entry entry;
struct mv88e6xxx_vtu_entry vlan;
- u16 fid;
int err;
/* Ports have two private address databases: one for when the port is
@@ -2225,7 +2223,7 @@ static int mv88e6xxx_port_db_load_purge(struct mv88e6xxx_chip *chip, int port,
* VLAN ID into the port's database used for VLAN-unaware bridging.
*/
if (vid == 0) {
- fid = MV88E6XXX_FID_BRIDGED;
+ *fid = MV88E6XXX_FID_BRIDGED;
} else {
err = mv88e6xxx_vtu_get(chip, vid, &vlan);
if (err)
@@ -2235,14 +2233,39 @@ static int mv88e6xxx_port_db_load_purge(struct mv88e6xxx_chip *chip, int port,
if (!vlan.valid)
return -EOPNOTSUPP;
- fid = vlan.fid;
+ *fid = vlan.fid;
}
- entry.state = 0;
- ether_addr_copy(entry.mac, addr);
- eth_addr_dec(entry.mac);
+ entry->state = 0;
+ ether_addr_copy(entry->mac, addr);
+ eth_addr_dec(entry->mac);
+
+ return mv88e6xxx_g1_atu_getnext(chip, *fid, entry);
+}
+
+static bool mv88e6xxx_port_db_find(struct mv88e6xxx_chip *chip,
+ const unsigned char *addr, u16 vid)
+{
+ struct mv88e6xxx_atu_entry entry;
+ u16 fid;
+ int err;
- err = mv88e6xxx_g1_atu_getnext(chip, fid, &entry);
+ err = mv88e6xxx_port_db_get(chip, addr, vid, &fid, &entry);
+ if (err)
+ return false;
+
+ return entry.state && ether_addr_equal(entry.mac, addr);
+}
+
+static int mv88e6xxx_port_db_load_purge(struct mv88e6xxx_chip *chip, int port,
+ const unsigned char *addr, u16 vid,
+ u8 state)
+{
+ struct mv88e6xxx_atu_entry entry;
+ u16 fid;
+ int err;
+
+ err = mv88e6xxx_port_db_get(chip, addr, vid, &fid, &entry);
if (err)
return err;
@@ -2847,6 +2870,13 @@ static int mv88e6xxx_port_fdb_add(struct dsa_switch *ds, int port,
err = mv88e6xxx_port_db_load_purge(chip, port, addr, vid,
MV88E6XXX_G1_ATU_DATA_STATE_UC_STATIC);
mv88e6xxx_reg_unlock(chip);
+ if (err)
+ return err;
+
+ mv88e6xxx_reg_lock(chip);
+ if (!mv88e6xxx_port_db_find(chip, addr, vid))
+ err = -ENOSPC;
+ mv88e6xxx_reg_unlock(chip);
return err;
}
@@ -6615,6 +6645,13 @@ static int mv88e6xxx_port_mdb_add(struct dsa_switch *ds, int port,
err = mv88e6xxx_port_db_load_purge(chip, port, mdb->addr, mdb->vid,
MV88E6XXX_G1_ATU_DATA_STATE_MC_STATIC);
mv88e6xxx_reg_unlock(chip);
+ if (err)
+ return err;
+
+ mv88e6xxx_reg_lock(chip);
+ if (!mv88e6xxx_port_db_find(chip, mdb->addr, mdb->vid))
+ err = -ENOSPC;
+ mv88e6xxx_reg_unlock(chip);
return err;
}
ATU Load operations could fail silently if there's not enough space on the device to hold the new entry. When this happens, the symptom depends on the unknown flood settings. If unknown multicast flood is disabled, the multicast packets are dropped when the ATU table is full. If unknown multicast flood is enabled, the multicast packets will be flooded to all ports. Either way, IGMP snooping is broken when the ATU Load operation fails silently. Do a Read-After-Write verification after each fdb/mdb add operation to make sure that the operation was really successful, and return -ENOSPC otherwise. Fixes: defb05b9b9b4 ("net: dsa: mv88e6xxx: Add support for fdb_add, fdb_del, and fdb_getnext") Signed-off-by: Joseph Huang <Joseph.Huang@garmin.com> --- V1: https://lore.kernel.org/lkml/20250304235352.3259613-1-Joseph.Huang@garmin.com/ V2: Add helper function to check the existence of an entry and only call it in mv88e6xxx_port_fdb/mdb_add(). --- drivers/net/dsa/mv88e6xxx/chip.c | 59 ++++++++++++++++++++++++++------ 1 file changed, 48 insertions(+), 11 deletions(-)