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  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Distributed Switch Architecture loopback driver
  4 *
  5 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
  6 */
  7
  8#include <linux/platform_device.h>
  9#include <linux/netdevice.h>
 10#include <linux/phy.h>
 11#include <linux/phy_fixed.h>
 12#include <linux/export.h>
 13#include <linux/ethtool.h>
 14#include <linux/workqueue.h>
 15#include <linux/module.h>
 16#include <linux/if_bridge.h>
 17#include <linux/dsa/loop.h>
 18#include <net/dsa.h>
 19
 20#include "dsa_loop.h"
 21
 22static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
 23	[DSA_LOOP_PHY_READ_OK]	= { "phy_read_ok", },
 24	[DSA_LOOP_PHY_READ_ERR]	= { "phy_read_err", },
 25	[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
 26	[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
 27};
 28
 29static struct phy_device *phydevs[PHY_MAX_ADDR];
 30
 31enum dsa_loop_devlink_resource_id {
 32	DSA_LOOP_DEVLINK_PARAM_ID_VTU,
 33};
 34
 35static u64 dsa_loop_devlink_vtu_get(void *priv)
 36{
 37	struct dsa_loop_priv *ps = priv;
 38	unsigned int i, count = 0;
 39	struct dsa_loop_vlan *vl;
 40
 41	for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
 42		vl = &ps->vlans[i];
 43		if (vl->members)
 44			count++;
 45	}
 46
 47	return count;
 48}
 49
 50static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
 51{
 52	struct devlink_resource_size_params size_params;
 53	struct dsa_loop_priv *ps = ds->priv;
 54	int err;
 55
 56	devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
 57					  ARRAY_SIZE(ps->vlans),
 58					  1, DEVLINK_RESOURCE_UNIT_ENTRY);
 59
 60	err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
 61					    DSA_LOOP_DEVLINK_PARAM_ID_VTU,
 62					    DEVLINK_RESOURCE_ID_PARENT_TOP,
 63					    &size_params);
 64	if (err)
 65		goto out;
 66
 67	dsa_devlink_resource_occ_get_register(ds,
 68					      DSA_LOOP_DEVLINK_PARAM_ID_VTU,
 69					      dsa_loop_devlink_vtu_get, ps);
 70
 71	return 0;
 72
 73out:
 74	dsa_devlink_resources_unregister(ds);
 75	return err;
 76}
 77
 78static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
 79						   int port,
 80						   enum dsa_tag_protocol mp)
 81{
 82	dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
 83
 84	return DSA_TAG_PROTO_NONE;
 85}
 86
 87static int dsa_loop_setup(struct dsa_switch *ds)
 88{
 89	struct dsa_loop_priv *ps = ds->priv;
 90	unsigned int i;
 91
 92	for (i = 0; i < ds->num_ports; i++)
 93		memcpy(ps->ports[i].mib, dsa_loop_mibs,
 94		       sizeof(dsa_loop_mibs));
 95
 96	dev_dbg(ds->dev, "%s\n", __func__);
 97
 98	return dsa_loop_setup_devlink_resources(ds);
 99}
100
101static void dsa_loop_teardown(struct dsa_switch *ds)
102{
103	dsa_devlink_resources_unregister(ds);
104}
105
106static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
107{
108	if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
109		return 0;
110
111	return __DSA_LOOP_CNT_MAX;
112}
113
114static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
115				 u32 stringset, uint8_t *data)
116{
117	struct dsa_loop_priv *ps = ds->priv;
118	unsigned int i;
119
120	if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
121		return;
122
123	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
124		memcpy(data + i * ETH_GSTRING_LEN,
125		       ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
126}
127
128static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
129				       uint64_t *data)
130{
131	struct dsa_loop_priv *ps = ds->priv;
132	unsigned int i;
133
134	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
135		data[i] = ps->ports[port].mib[i].val;
136}
137
138static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
139{
140	struct dsa_loop_priv *ps = ds->priv;
141	struct mii_bus *bus = ps->bus;
142	int ret;
143
144	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
145	if (ret < 0)
146		ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
147	else
148		ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
149
150	return ret;
151}
152
153static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
154			      int regnum, u16 value)
155{
156	struct dsa_loop_priv *ps = ds->priv;
157	struct mii_bus *bus = ps->bus;
158	int ret;
159
160	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
161	if (ret < 0)
162		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
163	else
164		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
165
166	return ret;
167}
168
169static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
170				     struct net_device *bridge)
171{
172	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
173		__func__, port, bridge->name);
174
175	return 0;
176}
177
178static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
179				       struct net_device *bridge)
180{
181	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
182		__func__, port, bridge->name);
183}
184
185static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
186					u8 state)
187{
188	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
189		__func__, port, state);
190}
191
192static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
193					bool vlan_filtering,
194					struct netlink_ext_ack *extack)
195{
196	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
197		__func__, port, vlan_filtering);
198
199	return 0;
200}
201
202static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
203				  const struct switchdev_obj_port_vlan *vlan,
204				  struct netlink_ext_ack *extack)
205{
206	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
207	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
208	struct dsa_loop_priv *ps = ds->priv;
209	struct mii_bus *bus = ps->bus;
210	struct dsa_loop_vlan *vl;
211
212	if (vlan->vid >= ARRAY_SIZE(ps->vlans))
213		return -ERANGE;
214
215	/* Just do a sleeping operation to make lockdep checks effective */
216	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
217
218	vl = &ps->vlans[vlan->vid];
219
220	vl->members |= BIT(port);
221	if (untagged)
222		vl->untagged |= BIT(port);
223	else
224		vl->untagged &= ~BIT(port);
225
226	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
227		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
228
229	if (pvid)
230		ps->ports[port].pvid = vlan->vid;
231
232	return 0;
233}
234
235static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
236				  const struct switchdev_obj_port_vlan *vlan)
237{
238	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
239	struct dsa_loop_priv *ps = ds->priv;
240	u16 pvid = ps->ports[port].pvid;
241	struct mii_bus *bus = ps->bus;
242	struct dsa_loop_vlan *vl;
243
244	/* Just do a sleeping operation to make lockdep checks effective */
245	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
246
247	vl = &ps->vlans[vlan->vid];
248
249	vl->members &= ~BIT(port);
250	if (untagged)
251		vl->untagged &= ~BIT(port);
252
253	if (pvid == vlan->vid)
254		pvid = 1;
255
256	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
257		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
258	ps->ports[port].pvid = pvid;
259
260	return 0;
261}
262
263static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
264				    int new_mtu)
265{
266	struct dsa_loop_priv *priv = ds->priv;
267
268	priv->ports[port].mtu = new_mtu;
269
270	return 0;
271}
272
273static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
274{
275	return ETH_MAX_MTU;
276}
277
278static const struct dsa_switch_ops dsa_loop_driver = {
279	.get_tag_protocol	= dsa_loop_get_protocol,
280	.setup			= dsa_loop_setup,
281	.teardown		= dsa_loop_teardown,
282	.get_strings		= dsa_loop_get_strings,
283	.get_ethtool_stats	= dsa_loop_get_ethtool_stats,
284	.get_sset_count		= dsa_loop_get_sset_count,
285	.get_ethtool_phy_stats	= dsa_loop_get_ethtool_stats,
286	.phy_read		= dsa_loop_phy_read,
287	.phy_write		= dsa_loop_phy_write,
288	.port_bridge_join	= dsa_loop_port_bridge_join,
289	.port_bridge_leave	= dsa_loop_port_bridge_leave,
290	.port_stp_state_set	= dsa_loop_port_stp_state_set,
291	.port_vlan_filtering	= dsa_loop_port_vlan_filtering,
292	.port_vlan_add		= dsa_loop_port_vlan_add,
293	.port_vlan_del		= dsa_loop_port_vlan_del,
294	.port_change_mtu	= dsa_loop_port_change_mtu,
295	.port_max_mtu		= dsa_loop_port_max_mtu,
296};
297
298static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
299{
300	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
301	struct dsa_loop_priv *ps;
302	struct dsa_switch *ds;
303	int ret;
304
305	if (!pdata)
306		return -ENODEV;
307
308	ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
309	if (!ds)
310		return -ENOMEM;
311
312	ds->dev = &mdiodev->dev;
313	ds->num_ports = DSA_LOOP_NUM_PORTS;
314
315	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
316	if (!ps)
317		return -ENOMEM;
318
319	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
320	if (!ps->netdev)
321		return -EPROBE_DEFER;
322
323	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
324
325	ds->dev = &mdiodev->dev;
326	ds->ops = &dsa_loop_driver;
327	ds->priv = ps;
328	ps->bus = mdiodev->bus;
329
330	dev_set_drvdata(&mdiodev->dev, ds);
331
332	ret = dsa_register_switch(ds);
333	if (!ret)
334		dev_info(&mdiodev->dev, "%s: 0x%0x\n",
335			 pdata->name, pdata->enabled_ports);
336
337	return ret;
338}
339
340static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
341{
342	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
343	struct dsa_loop_priv *ps = ds->priv;
344
345	dsa_unregister_switch(ds);
346	dev_put(ps->netdev);
347}
348
349static struct mdio_driver dsa_loop_drv = {
350	.mdiodrv.driver	= {
351		.name	= "dsa-loop",
352	},
353	.probe	= dsa_loop_drv_probe,
354	.remove	= dsa_loop_drv_remove,
355};
356
357#define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)
358
359static int __init dsa_loop_init(void)
360{
361	struct fixed_phy_status status = {
362		.link = 1,
363		.speed = SPEED_100,
364		.duplex = DUPLEX_FULL,
365	};
366	unsigned int i;
367
368	for (i = 0; i < NUM_FIXED_PHYS; i++)
369		phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
370
371	return mdio_driver_register(&dsa_loop_drv);
372}
373module_init(dsa_loop_init);
374
375static void __exit dsa_loop_exit(void)
376{
377	unsigned int i;
378
379	mdio_driver_unregister(&dsa_loop_drv);
380	for (i = 0; i < NUM_FIXED_PHYS; i++)
381		if (!IS_ERR(phydevs[i]))
382			fixed_phy_unregister(phydevs[i]);
383}
384module_exit(dsa_loop_exit);
385
386MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
387MODULE_LICENSE("GPL");
388MODULE_AUTHOR("Florian Fainelli");
389MODULE_DESCRIPTION("DSA loopback driver");