1 files changed, 420 insertions, 0 deletions

diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
new file mode 100644
index 0000000000..5b139f2206
--- /dev/null
+++ b/drivers/net/dsa/dsa_loop.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Distributed Switch Architecture loopback driver
+ *
+ * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/phy_fixed.h>
+#include <linux/export.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/module.h>
+#include <linux/if_bridge.h>
+#include <linux/dsa/loop.h>
+#include <net/dsa.h>
+
+#include "dsa_loop.h"
+
+static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
+	[DSA_LOOP_PHY_READ_OK]	= { "phy_read_ok", },
+	[DSA_LOOP_PHY_READ_ERR]	= { "phy_read_err", },
+	[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
+	[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
+};
+
+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)
+{
+	dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
+
+	return DSA_TAG_PROTO_NONE;
+}
+
+static int dsa_loop_setup(struct dsa_switch *ds)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	unsigned int i;
+
+	for (i = 0; i < ds->num_ports; i++)
+		memcpy(ps->ports[i].mib, dsa_loop_mibs,
+		       sizeof(dsa_loop_mibs));
+
+	dev_dbg(ds->dev, "%s\n", __func__);
+
+	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)
+{
+	if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
+		return 0;
+
+	return __DSA_LOOP_CNT_MAX;
+}
+
+static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
+				 u32 stringset, uint8_t *data)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	unsigned int i;
+
+	if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
+		return;
+
+	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
+		memcpy(data + i * ETH_GSTRING_LEN,
+		       ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
+}
+
+static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
+				       uint64_t *data)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	unsigned int i;
+
+	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
+		data[i] = ps->ports[port].mib[i].val;
+}
+
+static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	struct mii_bus *bus = ps->bus;
+	int ret;
+
+	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
+	if (ret < 0)
+		ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
+	else
+		ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
+
+	return ret;
+}
+
+static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
+			      int regnum, u16 value)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	struct mii_bus *bus = ps->bus;
+	int ret;
+
+	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
+	if (ret < 0)
+		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
+	else
+		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
+
+	return ret;
+}
+
+static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
+				     struct dsa_bridge bridge,
+				     bool *tx_fwd_offload,
+				     struct netlink_ext_ack *extack)
+{
+	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
+		__func__, port, bridge.dev->name);
+
+	return 0;
+}
+
+static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
+				       struct dsa_bridge bridge)
+{
+	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
+		__func__, port, bridge.dev->name);
+}
+
+static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
+					u8 state)
+{
+	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
+		__func__, port, state);
+}
+
+static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
+					bool vlan_filtering,
+					struct netlink_ext_ack *extack)
+{
+	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
+		__func__, port, vlan_filtering);
+
+	return 0;
+}
+
+static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
+				  const struct switchdev_obj_port_vlan *vlan,
+				  struct netlink_ext_ack *extack)
+{
+	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
+	struct dsa_loop_priv *ps = ds->priv;
+	struct mii_bus *bus = ps->bus;
+	struct dsa_loop_vlan *vl;
+
+	if (vlan->vid >= ARRAY_SIZE(ps->vlans))
+		return -ERANGE;
+
+	/* Just do a sleeping operation to make lockdep checks effective */
+	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
+
+	vl = &ps->vlans[vlan->vid];
+
+	vl->members |= BIT(port);
+	if (untagged)
+		vl->untagged |= BIT(port);
+	else
+		vl->untagged &= ~BIT(port);
+
+	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
+		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
+
+	if (pvid)
+		ps->ports[port].pvid = vlan->vid;
+
+	return 0;
+}
+
+static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
+				  const struct switchdev_obj_port_vlan *vlan)
+{
+	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+	struct dsa_loop_priv *ps = ds->priv;
+	u16 pvid = ps->ports[port].pvid;
+	struct mii_bus *bus = ps->bus;
+	struct dsa_loop_vlan *vl;
+
+	/* Just do a sleeping operation to make lockdep checks effective */
+	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
+
+	vl = &ps->vlans[vlan->vid];
+
+	vl->members &= ~BIT(port);
+	if (untagged)
+		vl->untagged &= ~BIT(port);
+
+	if (pvid == vlan->vid)
+		pvid = 1;
+
+	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
+		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
+	ps->ports[port].pvid = pvid;
+
+	return 0;
+}
+
+static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
+				    int new_mtu)
+{
+	struct dsa_loop_priv *priv = ds->priv;
+
+	priv->ports[port].mtu = new_mtu;
+
+	return 0;
+}
+
+static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
+{
+	return ETH_MAX_MTU;
+}
+
+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,
+	.get_ethtool_phy_stats	= dsa_loop_get_ethtool_stats,
+	.phy_read		= dsa_loop_phy_read,
+	.phy_write		= dsa_loop_phy_write,
+	.port_bridge_join	= dsa_loop_port_bridge_join,
+	.port_bridge_leave	= dsa_loop_port_bridge_leave,
+	.port_stp_state_set	= dsa_loop_port_stp_state_set,
+	.port_vlan_filtering	= dsa_loop_port_vlan_filtering,
+	.port_vlan_add		= dsa_loop_port_vlan_add,
+	.port_vlan_del		= dsa_loop_port_vlan_del,
+	.port_change_mtu	= dsa_loop_port_change_mtu,
+	.port_max_mtu		= dsa_loop_port_max_mtu,
+};
+
+static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
+{
+	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
+	struct dsa_loop_priv *ps;
+	struct dsa_switch *ds;
+	int ret;
+
+	if (!pdata)
+		return -ENODEV;
+
+	ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
+	if (!ds)
+		return -ENOMEM;
+
+	ds->dev = &mdiodev->dev;
+	ds->num_ports = DSA_LOOP_NUM_PORTS;
+
+	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
+	if (!ps)
+		return -ENOMEM;
+
+	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
+	if (!ps->netdev)
+		return -EPROBE_DEFER;
+
+	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
+
+	ds->dev = &mdiodev->dev;
+	ds->ops = &dsa_loop_driver;
+	ds->priv = ps;
+	ps->bus = mdiodev->bus;
+
+	dev_set_drvdata(&mdiodev->dev, ds);
+
+	ret = dsa_register_switch(ds);
+	if (!ret)
+		dev_info(&mdiodev->dev, "%s: 0x%0x\n",
+			 pdata->name, pdata->enabled_ports);
+
+	return ret;
+}
+
+static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
+{
+	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
+	struct dsa_loop_priv *ps;
+
+	if (!ds)
+		return;
+
+	ps = ds->priv;
+
+	dsa_unregister_switch(ds);
+	dev_put(ps->netdev);
+}
+
+static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
+{
+	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
+
+	if (!ds)
+		return;
+
+	dsa_switch_shutdown(ds);
+
+	dev_set_drvdata(&mdiodev->dev, NULL);
+}
+
+static struct mdio_driver dsa_loop_drv = {
+	.mdiodrv.driver	= {
+		.name	= "dsa-loop",
+	},
+	.probe	= dsa_loop_drv_probe,
+	.remove	= dsa_loop_drv_remove,
+	.shutdown = dsa_loop_drv_shutdown,
+};
+
+#define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)
+
+static void dsa_loop_phydevs_unregister(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < NUM_FIXED_PHYS; i++)
+		if (!IS_ERR(phydevs[i])) {
+			fixed_phy_unregister(phydevs[i]);
+			phy_device_free(phydevs[i]);
+		}
+}
+
+static int __init dsa_loop_init(void)
+{
+	struct fixed_phy_status status = {
+		.link = 1,
+		.speed = SPEED_100,
+		.duplex = DUPLEX_FULL,
+	};
+	unsigned int i, ret;
+
+	for (i = 0; i < NUM_FIXED_PHYS; i++)
+		phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
+
+	ret = mdio_driver_register(&dsa_loop_drv);
+	if (ret)
+		dsa_loop_phydevs_unregister();
+
+	return ret;
+}
+module_init(dsa_loop_init);
+
+static void __exit dsa_loop_exit(void)
+{
+	mdio_driver_unregister(&dsa_loop_drv);
+	dsa_loop_phydevs_unregister();
+}
+module_exit(dsa_loop_exit);
+
+MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Fainelli");
+MODULE_DESCRIPTION("DSA loopback driver");