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