net: dsa: loop: Return VLAN table size through devlink

We return the VLAN table size through devlink as a simple parameter, we
do not support altering it at runtime:

devlink resource show mdio_bus/fixed-0:1f
mdio_bus/fixed-0:1f:
  name VTU size 4096 occ 0 unit entry dpipe_tables none

and after configure a bridge with VLAN filtering:

devlink resource show mdio_bus/fixed-0:1f
mdio_bus/fixed-0:1f:
  name VTU size 4096 occ 1 unit entry dpipe_tables none

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
index e6fc4fec9cfc60d7d49941521eba519050b6b0ab..b588614d1e5e28b034c97a46d36a0b4bcdddc9e4 100644 (file)
--- a/drivers/net/dsa/dsa_loop.c
+++ b/drivers/net/dsa/dsa_loop.c
@@ -28,6 +28,53 @@ static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
 
 static struct phy_device *phydevs[PHY_MAX_ADDR];
 
+enum dsa_loop_devlink_resource_id {
+       DSA_LOOP_DEVLINK_PARAM_ID_VTU,
+};
+
+static u64 dsa_loop_devlink_vtu_get(void *priv)
+{
+       struct dsa_loop_priv *ps = priv;
+       unsigned int i, count = 0;
+       struct dsa_loop_vlan *vl;
+
+       for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
+               vl = &ps->vlans[i];
+               if (vl->members)
+                       count++;
+       }
+
+       return count;
+}
+
+static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
+{
+       struct devlink_resource_size_params size_params;
+       struct dsa_loop_priv *ps = ds->priv;
+       int err;
+
+       devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
+                                         ARRAY_SIZE(ps->vlans),
+                                         1, DEVLINK_RESOURCE_UNIT_ENTRY);
+
+       err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
+                                           DSA_LOOP_DEVLINK_PARAM_ID_VTU,
+                                           DEVLINK_RESOURCE_ID_PARENT_TOP,
+                                           &size_params);
+       if (err)
+               goto out;
+
+       dsa_devlink_resource_occ_get_register(ds,
+                                             DSA_LOOP_DEVLINK_PARAM_ID_VTU,
+                                             dsa_loop_devlink_vtu_get, ps);
+
+       return 0;
+
+out:
+       dsa_devlink_resources_unregister(ds);
+       return err;
+}
+
 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
                                                   int port,
                                                   enum dsa_tag_protocol mp)
@@ -48,7 +95,12 @@ static int dsa_loop_setup(struct dsa_switch *ds)
 
        dev_dbg(ds->dev, "%s\n", __func__);
 
-       return 0;
+       return dsa_loop_setup_devlink_resources(ds);
+}
+
+static void dsa_loop_teardown(struct dsa_switch *ds)
+{
+       dsa_devlink_resources_unregister(ds);
 }
 
 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
@@ -243,6 +295,7 @@ static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
 static const struct dsa_switch_ops dsa_loop_driver = {
        .get_tag_protocol       = dsa_loop_get_protocol,
        .setup                  = dsa_loop_setup,
+       .teardown               = dsa_loop_teardown,
        .get_strings            = dsa_loop_get_strings,
        .get_ethtool_stats      = dsa_loop_get_ethtool_stats,
        .get_sset_count         = dsa_loop_get_sset_count,