Merge branch 'net-dsa-hellcreek-report-tables-sizes'

Kurt Kanzenbach says:

====================
net: dsa: hellcreek: Report tables sizes

Florian, Andrew and Vladimir suggested at some point to use devlink for
reporting tables, features and debugging counters instead of using debugfs and
printk.

So, start by reporting the VLAN and FDB table sizes.
====================

Link: https://lore.kernel.org/r/20210130135934.22870-1-kurt@kmk-computers.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/hirschmann/hellcreek.c

@@ -221,12 +221,11 @@ static void hellcreek_feature_detect(struct hellcreek *hellcreek)
 
 	features = hellcreek_read(hellcreek, HR_FEABITS0);
 
-	/* Currently we only detect the size of the FDB table */
+	/* Only detect the size of the FDB table. The size and current
+	 * utilization can be queried via devlink.
+	 */
 	hellcreek->fdb_entries = ((features & HR_FEABITS0_FDBBINS_MASK) >>
 			       HR_FEABITS0_FDBBINS_SHIFT) * 32;
-
-	dev_info(hellcreek->dev, "Feature detect: FDB entries=%zu\n",
-		 hellcreek->fdb_entries);
 }
 
 static enum dsa_tag_protocol hellcreek_get_tag_protocol(struct dsa_switch *ds,
@@ -1000,6 +999,84 @@ static int hellcreek_setup_fdb(struct hellcreek *hellcreek)
 	return ret;
 }
 
+static u64 hellcreek_devlink_vlan_table_get(void *priv)
+{
+	struct hellcreek *hellcreek = priv;
+	u64 count = 0;
+	int i;
+
+	mutex_lock(&hellcreek->reg_lock);
+	for (i = 0; i < VLAN_N_VID; ++i)
+		if (hellcreek->vidmbrcfg[i])
+			count++;
+	mutex_unlock(&hellcreek->reg_lock);
+
+	return count;
+}
+
+static u64 hellcreek_devlink_fdb_table_get(void *priv)
+{
+	struct hellcreek *hellcreek = priv;
+	u64 count = 0;
+
+	/* Reading this register has side effects. Synchronize against the other
+	 * FDB operations.
+	 */
+	mutex_lock(&hellcreek->reg_lock);
+	count = hellcreek_read(hellcreek, HR_FDBMAX);
+	mutex_unlock(&hellcreek->reg_lock);
+
+	return count;
+}
+
+static int hellcreek_setup_devlink_resources(struct dsa_switch *ds)
+{
+	struct devlink_resource_size_params size_vlan_params;
+	struct devlink_resource_size_params size_fdb_params;
+	struct hellcreek *hellcreek = ds->priv;
+	int err;
+
+	devlink_resource_size_params_init(&size_vlan_params, VLAN_N_VID,
+					  VLAN_N_VID,
+					  1, DEVLINK_RESOURCE_UNIT_ENTRY);
+
+	devlink_resource_size_params_init(&size_fdb_params,
+					  hellcreek->fdb_entries,
+					  hellcreek->fdb_entries,
+					  1, DEVLINK_RESOURCE_UNIT_ENTRY);
+
+	err = dsa_devlink_resource_register(ds, "VLAN", VLAN_N_VID,
+					    HELLCREEK_DEVLINK_PARAM_ID_VLAN_TABLE,
+					    DEVLINK_RESOURCE_ID_PARENT_TOP,
+					    &size_vlan_params);
+	if (err)
+		goto out;
+
+	err = dsa_devlink_resource_register(ds, "FDB", hellcreek->fdb_entries,
+					    HELLCREEK_DEVLINK_PARAM_ID_FDB_TABLE,
+					    DEVLINK_RESOURCE_ID_PARENT_TOP,
+					    &size_fdb_params);
+	if (err)
+		goto out;
+
+	dsa_devlink_resource_occ_get_register(ds,
+					      HELLCREEK_DEVLINK_PARAM_ID_VLAN_TABLE,
+					      hellcreek_devlink_vlan_table_get,
+					      hellcreek);
+
+	dsa_devlink_resource_occ_get_register(ds,
+					      HELLCREEK_DEVLINK_PARAM_ID_FDB_TABLE,
+					      hellcreek_devlink_fdb_table_get,
+					      hellcreek);
+
+	return 0;
+
+out:
+	dsa_devlink_resources_unregister(ds);
+
+	return err;
+}
+
 static int hellcreek_setup(struct dsa_switch *ds)
 {
 	struct hellcreek *hellcreek = ds->priv;
@@ -1053,9 +1130,22 @@ static int hellcreek_setup(struct dsa_switch *ds)
 		return ret;
 	}
 
+	/* Register devlink resources with DSA */
+	ret = hellcreek_setup_devlink_resources(ds);
+	if (ret) {
+		dev_err(hellcreek->dev,
+			"Failed to setup devlink resources!\n");
+		return ret;
+	}
+
 	return 0;
 }
 
+static void hellcreek_teardown(struct dsa_switch *ds)
+{
+	dsa_devlink_resources_unregister(ds);
+}
+
 static void hellcreek_phylink_validate(struct dsa_switch *ds, int port,
 				       unsigned long *supported,
 				       struct phylink_link_state *state)
@@ -1447,6 +1537,7 @@ static const struct dsa_switch_ops hellcreek_ds_ops = {
 	.port_vlan_del	     = hellcreek_vlan_del,
 	.port_vlan_filtering = hellcreek_vlan_filtering,
 	.setup		     = hellcreek_setup,
+	.teardown	     = hellcreek_teardown,
 };
 
 static int hellcreek_probe(struct platform_device *pdev)

drivers/net/dsa/hirschmann/hellcreek.h

@@ -298,4 +298,10 @@ struct hellcreek {
 #define dw_to_hellcreek_port(dw)				\
 	container_of(dw, struct hellcreek_port, schedule_work)
 
+/* Devlink resources */
+enum hellcreek_devlink_resource_id {
+	HELLCREEK_DEVLINK_PARAM_ID_VLAN_TABLE,
+	HELLCREEK_DEVLINK_PARAM_ID_FDB_TABLE,
+};
+
 #endif /* _HELLCREEK_H_ */