net: dsa: b53: serialize access to the ARL table

The b53 driver performs non-atomic transactions to the ARL table when
adding, deleting and reading FDB and MDB entries.

Traditionally these were all serialized by the rtnl_lock(), but now it
is possible that DSA calls ->port_fdb_add and ->port_fdb_del without
holding that lock.

So the driver must have its own serialization logic. Add a mutex and
hold it from all entry points (->port_fdb_{add,del,dump},
->port_mdb_{add,del}).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 51dfaf8..af47619 100644 (file)
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1542,7 +1542,7 @@ int b53_vlan_del(struct dsa_switch *ds, int port,
 }
 EXPORT_SYMBOL(b53_vlan_del);
 
-/* Address Resolution Logic routines */
+/* Address Resolution Logic routines. Caller must hold &dev->arl_mutex. */
 static int b53_arl_op_wait(struct b53_device *dev)
 {
        unsigned int timeout = 10;
@@ -1707,6 +1707,7 @@ int b53_fdb_add(struct dsa_switch *ds, int port,
                const unsigned char *addr, u16 vid)
 {
        struct b53_device *priv = ds->priv;
+       int ret;
 
        /* 5325 and 5365 require some more massaging, but could
         * be supported eventually
@@ -1714,7 +1715,11 @@ int b53_fdb_add(struct dsa_switch *ds, int port,
        if (is5325(priv) || is5365(priv))
                return -EOPNOTSUPP;
 
-       return b53_arl_op(priv, 0, port, addr, vid, true);
+       mutex_lock(&priv->arl_mutex);
+       ret = b53_arl_op(priv, 0, port, addr, vid, true);
+       mutex_unlock(&priv->arl_mutex);
+
+       return ret;
 }
 EXPORT_SYMBOL(b53_fdb_add);
 
@@ -1722,8 +1727,13 @@ int b53_fdb_del(struct dsa_switch *ds, int port,
                const unsigned char *addr, u16 vid)
 {
        struct b53_device *priv = ds->priv;
+       int ret;
 
-       return b53_arl_op(priv, 0, port, addr, vid, false);
+       mutex_lock(&priv->arl_mutex);
+       ret = b53_arl_op(priv, 0, port, addr, vid, false);
+       mutex_unlock(&priv->arl_mutex);
+
+       return ret;
 }
 EXPORT_SYMBOL(b53_fdb_del);
 
@@ -1780,6 +1790,8 @@ int b53_fdb_dump(struct dsa_switch *ds, int port,
        int ret;
        u8 reg;
 
+       mutex_lock(&priv->arl_mutex);
+
        /* Start search operation */
        reg = ARL_SRCH_STDN;
        b53_write8(priv, B53_ARLIO_PAGE, B53_ARL_SRCH_CTL, reg);
@@ -1787,18 +1799,18 @@ int b53_fdb_dump(struct dsa_switch *ds, int port,
        do {
                ret = b53_arl_search_wait(priv);
                if (ret)
-                       return ret;
+                       break;
 
                b53_arl_search_rd(priv, 0, &results[0]);
                ret = b53_fdb_copy(port, &results[0], cb, data);
                if (ret)
-                       return ret;
+                       break;
 
                if (priv->num_arl_bins > 2) {
                        b53_arl_search_rd(priv, 1, &results[1]);
                        ret = b53_fdb_copy(port, &results[1], cb, data);
                        if (ret)
-                               return ret;
+                               break;
 
                        if (!results[0].is_valid && !results[1].is_valid)
                                break;
@@ -1806,6 +1818,8 @@ int b53_fdb_dump(struct dsa_switch *ds, int port,
 
        } while (count++ < b53_max_arl_entries(priv) / 2);
 
+       mutex_unlock(&priv->arl_mutex);
+
        return 0;
 }
 EXPORT_SYMBOL(b53_fdb_dump);
@@ -1814,6 +1828,7 @@ int b53_mdb_add(struct dsa_switch *ds, int port,
                const struct switchdev_obj_port_mdb *mdb)
 {
        struct b53_device *priv = ds->priv;
+       int ret;
 
        /* 5325 and 5365 require some more massaging, but could
         * be supported eventually
@@ -1821,7 +1836,11 @@ int b53_mdb_add(struct dsa_switch *ds, int port,
        if (is5325(priv) || is5365(priv))
                return -EOPNOTSUPP;
 
-       return b53_arl_op(priv, 0, port, mdb->addr, mdb->vid, true);
+       mutex_lock(&priv->arl_mutex);
+       ret = b53_arl_op(priv, 0, port, mdb->addr, mdb->vid, true);
+       mutex_unlock(&priv->arl_mutex);
+
+       return ret;
 }
 EXPORT_SYMBOL(b53_mdb_add);
 
@@ -1831,7 +1850,9 @@ int b53_mdb_del(struct dsa_switch *ds, int port,
        struct b53_device *priv = ds->priv;
        int ret;
 
+       mutex_lock(&priv->arl_mutex);
        ret = b53_arl_op(priv, 0, port, mdb->addr, mdb->vid, false);
+       mutex_unlock(&priv->arl_mutex);
        if (ret)
                dev_err(ds->dev, "failed to delete MDB entry\n");
 
@@ -2668,6 +2689,7 @@ struct b53_device *b53_switch_alloc(struct device *base,
 
        mutex_init(&dev->reg_mutex);
        mutex_init(&dev->stats_mutex);
+       mutex_init(&dev->arl_mutex);
 
        return dev;
 }

diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index 544101e..579da74 100644 (file)
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -107,6 +107,7 @@ struct b53_device {
 
        struct mutex reg_mutex;
        struct mutex stats_mutex;
+       struct mutex arl_mutex;
        const struct b53_io_ops *ops;
 
        /* chip specific data */