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		ethtool_puts(&data, ps->ports[port].mib[i].name);
125}
126
127static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
128				       uint64_t *data)
129{
130	struct dsa_loop_priv *ps = ds->priv;
131	unsigned int i;
132
133	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
134		data[i] = ps->ports[port].mib[i].val;
135}
136
137static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
138{
139	struct dsa_loop_priv *ps = ds->priv;
140	struct mii_bus *bus = ps->bus;
141	int ret;
142
143	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
144	if (ret < 0)
145		ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
146	else
147		ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
148
149	return ret;
150}
151
152static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
153			      int regnum, u16 value)
154{
155	struct dsa_loop_priv *ps = ds->priv;
156	struct mii_bus *bus = ps->bus;
157	int ret;
158
159	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
160	if (ret < 0)
161		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
162	else
163		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
164
165	return ret;
166}
167
168static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
169				     struct dsa_bridge bridge,
170				     bool *tx_fwd_offload,
171				     struct netlink_ext_ack *extack)
172{
173	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
174		__func__, port, bridge.dev->name);
175
176	return 0;
177}
178
179static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
180				       struct dsa_bridge bridge)
181{
182	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
183		__func__, port, bridge.dev->name);
184}
185
186static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
187					u8 state)
188{
189	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
190		__func__, port, state);
191}
192
193static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
194					bool vlan_filtering,
195					struct netlink_ext_ack *extack)
196{
197	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
198		__func__, port, vlan_filtering);
199
200	return 0;
201}
202
203static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
204				  const struct switchdev_obj_port_vlan *vlan,
205				  struct netlink_ext_ack *extack)
206{
207	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
208	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
209	struct dsa_loop_priv *ps = ds->priv;
210	struct mii_bus *bus = ps->bus;
211	struct dsa_loop_vlan *vl;
212
213	if (vlan->vid >= ARRAY_SIZE(ps->vlans))
214		return -ERANGE;
215
216	/* Just do a sleeping operation to make lockdep checks effective */
217	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
218
219	vl = &ps->vlans[vlan->vid];
220
221	vl->members |= BIT(port);
222	if (untagged)
223		vl->untagged |= BIT(port);
224	else
225		vl->untagged &= ~BIT(port);
226
227	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
228		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
229
230	if (pvid)
231		ps->ports[port].pvid = vlan->vid;
232
233	return 0;
234}
235
236static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
237				  const struct switchdev_obj_port_vlan *vlan)
238{
239	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
240	struct dsa_loop_priv *ps = ds->priv;
241	u16 pvid = ps->ports[port].pvid;
242	struct mii_bus *bus = ps->bus;
243	struct dsa_loop_vlan *vl;
244
245	/* Just do a sleeping operation to make lockdep checks effective */
246	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
247
248	vl = &ps->vlans[vlan->vid];
249
250	vl->members &= ~BIT(port);
251	if (untagged)
252		vl->untagged &= ~BIT(port);
253
254	if (pvid == vlan->vid)
255		pvid = 1;
256
257	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
258		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
259	ps->ports[port].pvid = pvid;
260
261	return 0;
262}
263
264static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
265				    int new_mtu)
266{
267	struct dsa_loop_priv *priv = ds->priv;
268
269	priv->ports[port].mtu = new_mtu;
270
271	return 0;
272}
273
274static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
275{
276	return ETH_MAX_MTU;
277}
278
279static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
280				      struct phylink_config *config)
281{
282	bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
283	__clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
284	config->mac_capabilities = ~0;
285}
286
287static const struct dsa_switch_ops dsa_loop_driver = {
288	.get_tag_protocol	= dsa_loop_get_protocol,
289	.setup			= dsa_loop_setup,
290	.teardown		= dsa_loop_teardown,
291	.get_strings		= dsa_loop_get_strings,
292	.get_ethtool_stats	= dsa_loop_get_ethtool_stats,
293	.get_sset_count		= dsa_loop_get_sset_count,
294	.get_ethtool_phy_stats	= dsa_loop_get_ethtool_stats,
295	.phy_read		= dsa_loop_phy_read,
296	.phy_write		= dsa_loop_phy_write,
297	.port_bridge_join	= dsa_loop_port_bridge_join,
298	.port_bridge_leave	= dsa_loop_port_bridge_leave,
299	.port_stp_state_set	= dsa_loop_port_stp_state_set,
300	.port_vlan_filtering	= dsa_loop_port_vlan_filtering,
301	.port_vlan_add		= dsa_loop_port_vlan_add,
302	.port_vlan_del		= dsa_loop_port_vlan_del,
303	.port_change_mtu	= dsa_loop_port_change_mtu,
304	.port_max_mtu		= dsa_loop_port_max_mtu,
305	.phylink_get_caps	= dsa_loop_phylink_get_caps,
306};
307
308static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
309{
310	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
311	struct dsa_loop_priv *ps;
312	struct dsa_switch *ds;
313	int ret;
314
315	if (!pdata)
316		return -ENODEV;
317
318	ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
319	if (!ds)
320		return -ENOMEM;
321
322	ds->dev = &mdiodev->dev;
323	ds->num_ports = DSA_LOOP_NUM_PORTS;
324
325	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
326	if (!ps)
327		return -ENOMEM;
328
329	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
330	if (!ps->netdev)
331		return -EPROBE_DEFER;
332
333	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
334
335	ds->dev = &mdiodev->dev;
336	ds->ops = &dsa_loop_driver;
337	ds->priv = ps;
338	ps->bus = mdiodev->bus;
339
340	dev_set_drvdata(&mdiodev->dev, ds);
341
342	ret = dsa_register_switch(ds);
343	if (!ret)
344		dev_info(&mdiodev->dev, "%s: 0x%0x\n",
345			 pdata->name, pdata->enabled_ports);
346
347	return ret;
348}
349
350static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
351{
352	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
353	struct dsa_loop_priv *ps;
354
355	if (!ds)
356		return;
357
358	ps = ds->priv;
359
360	dsa_unregister_switch(ds);
361	dev_put(ps->netdev);
362}
363
364static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
365{
366	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
367
368	if (!ds)
369		return;
370
371	dsa_switch_shutdown(ds);
372
373	dev_set_drvdata(&mdiodev->dev, NULL);
374}
375
376static struct mdio_driver dsa_loop_drv = {
377	.mdiodrv.driver	= {
378		.name	= "dsa-loop",
379	},
380	.probe	= dsa_loop_drv_probe,
381	.remove	= dsa_loop_drv_remove,
382	.shutdown = dsa_loop_drv_shutdown,
383};
384
385#define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)
386
387static void dsa_loop_phydevs_unregister(void)
388{
389	unsigned int i;
390
391	for (i = 0; i < NUM_FIXED_PHYS; i++)
392		if (!IS_ERR(phydevs[i])) {
393			fixed_phy_unregister(phydevs[i]);
394			phy_device_free(phydevs[i]);
395		}
396}
397
398static int __init dsa_loop_init(void)
399{
400	struct fixed_phy_status status = {
401		.link = 1,
402		.speed = SPEED_100,
403		.duplex = DUPLEX_FULL,
404	};
405	unsigned int i, ret;
406
407	for (i = 0; i < NUM_FIXED_PHYS; i++)
408		phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
409
410	ret = mdio_driver_register(&dsa_loop_drv);
411	if (ret)
412		dsa_loop_phydevs_unregister();
413
414	return ret;
415}
416module_init(dsa_loop_init);
417
418static void __exit dsa_loop_exit(void)
419{
420	mdio_driver_unregister(&dsa_loop_drv);
421	dsa_loop_phydevs_unregister();
422}
423module_exit(dsa_loop_exit);
424
425MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
426MODULE_LICENSE("GPL");
427MODULE_AUTHOR("Florian Fainelli");
428MODULE_DESCRIPTION("DSA loopback driver");