Loading...
Note: File does not exist in v3.15.
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 <net/dsa.h>
18
19#include "dsa_loop.h"
20
21struct dsa_loop_vlan {
22 u16 members;
23 u16 untagged;
24};
25
26struct dsa_loop_mib_entry {
27 char name[ETH_GSTRING_LEN];
28 unsigned long val;
29};
30
31enum dsa_loop_mib_counters {
32 DSA_LOOP_PHY_READ_OK,
33 DSA_LOOP_PHY_READ_ERR,
34 DSA_LOOP_PHY_WRITE_OK,
35 DSA_LOOP_PHY_WRITE_ERR,
36 __DSA_LOOP_CNT_MAX,
37};
38
39static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
40 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
41 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
42 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
43 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
44};
45
46struct dsa_loop_port {
47 struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
48};
49
50#define DSA_LOOP_VLANS 5
51
52struct dsa_loop_priv {
53 struct mii_bus *bus;
54 unsigned int port_base;
55 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
56 struct net_device *netdev;
57 struct dsa_loop_port ports[DSA_MAX_PORTS];
58 u16 pvid;
59};
60
61static struct phy_device *phydevs[PHY_MAX_ADDR];
62
63static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
64 int port)
65{
66 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
67
68 return DSA_TAG_PROTO_NONE;
69}
70
71static int dsa_loop_setup(struct dsa_switch *ds)
72{
73 struct dsa_loop_priv *ps = ds->priv;
74 unsigned int i;
75
76 for (i = 0; i < ds->num_ports; i++)
77 memcpy(ps->ports[i].mib, dsa_loop_mibs,
78 sizeof(dsa_loop_mibs));
79
80 dev_dbg(ds->dev, "%s\n", __func__);
81
82 return 0;
83}
84
85static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
86{
87 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
88 return 0;
89
90 return __DSA_LOOP_CNT_MAX;
91}
92
93static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
94 u32 stringset, uint8_t *data)
95{
96 struct dsa_loop_priv *ps = ds->priv;
97 unsigned int i;
98
99 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
100 return;
101
102 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
103 memcpy(data + i * ETH_GSTRING_LEN,
104 ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
105}
106
107static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
108 uint64_t *data)
109{
110 struct dsa_loop_priv *ps = ds->priv;
111 unsigned int i;
112
113 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
114 data[i] = ps->ports[port].mib[i].val;
115}
116
117static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
118{
119 struct dsa_loop_priv *ps = ds->priv;
120 struct mii_bus *bus = ps->bus;
121 int ret;
122
123 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
124 if (ret < 0)
125 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
126 else
127 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
128
129 return ret;
130}
131
132static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
133 int regnum, u16 value)
134{
135 struct dsa_loop_priv *ps = ds->priv;
136 struct mii_bus *bus = ps->bus;
137 int ret;
138
139 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
140 if (ret < 0)
141 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
142 else
143 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
144
145 return ret;
146}
147
148static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
149 struct net_device *bridge)
150{
151 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
152 __func__, port, bridge->name);
153
154 return 0;
155}
156
157static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
158 struct net_device *bridge)
159{
160 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
161 __func__, port, bridge->name);
162}
163
164static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
165 u8 state)
166{
167 dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
168 __func__, port, state);
169}
170
171static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
172 bool vlan_filtering)
173{
174 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
175 __func__, port, vlan_filtering);
176
177 return 0;
178}
179
180static int
181dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
182 const struct switchdev_obj_port_vlan *vlan)
183{
184 struct dsa_loop_priv *ps = ds->priv;
185 struct mii_bus *bus = ps->bus;
186
187 dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d",
188 __func__, port, vlan->vid_begin, vlan->vid_end);
189
190 /* Just do a sleeping operation to make lockdep checks effective */
191 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
192
193 if (vlan->vid_end > DSA_LOOP_VLANS)
194 return -ERANGE;
195
196 return 0;
197}
198
199static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
200 const struct switchdev_obj_port_vlan *vlan)
201{
202 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
203 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
204 struct dsa_loop_priv *ps = ds->priv;
205 struct mii_bus *bus = ps->bus;
206 struct dsa_loop_vlan *vl;
207 u16 vid;
208
209 /* Just do a sleeping operation to make lockdep checks effective */
210 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
211
212 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
213 vl = &ps->vlans[vid];
214
215 vl->members |= BIT(port);
216 if (untagged)
217 vl->untagged |= BIT(port);
218 else
219 vl->untagged &= ~BIT(port);
220
221 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
222 __func__, port, vid, untagged ? "un" : "", pvid);
223 }
224
225 if (pvid)
226 ps->pvid = vid;
227}
228
229static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
230 const struct switchdev_obj_port_vlan *vlan)
231{
232 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
233 struct dsa_loop_priv *ps = ds->priv;
234 struct mii_bus *bus = ps->bus;
235 struct dsa_loop_vlan *vl;
236 u16 vid, pvid = ps->pvid;
237
238 /* Just do a sleeping operation to make lockdep checks effective */
239 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
240
241 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
242 vl = &ps->vlans[vid];
243
244 vl->members &= ~BIT(port);
245 if (untagged)
246 vl->untagged &= ~BIT(port);
247
248 if (pvid == vid)
249 pvid = 1;
250
251 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
252 __func__, port, vid, untagged ? "un" : "", pvid);
253 }
254 ps->pvid = pvid;
255
256 return 0;
257}
258
259static const struct dsa_switch_ops dsa_loop_driver = {
260 .get_tag_protocol = dsa_loop_get_protocol,
261 .setup = dsa_loop_setup,
262 .get_strings = dsa_loop_get_strings,
263 .get_ethtool_stats = dsa_loop_get_ethtool_stats,
264 .get_sset_count = dsa_loop_get_sset_count,
265 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
266 .phy_read = dsa_loop_phy_read,
267 .phy_write = dsa_loop_phy_write,
268 .port_bridge_join = dsa_loop_port_bridge_join,
269 .port_bridge_leave = dsa_loop_port_bridge_leave,
270 .port_stp_state_set = dsa_loop_port_stp_state_set,
271 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
272 .port_vlan_prepare = dsa_loop_port_vlan_prepare,
273 .port_vlan_add = dsa_loop_port_vlan_add,
274 .port_vlan_del = dsa_loop_port_vlan_del,
275};
276
277static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
278{
279 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
280 struct dsa_loop_priv *ps;
281 struct dsa_switch *ds;
282
283 if (!pdata)
284 return -ENODEV;
285
286 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
287 pdata->name, pdata->enabled_ports);
288
289 ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
290 if (!ds)
291 return -ENOMEM;
292
293 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
294 if (!ps)
295 return -ENOMEM;
296
297 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
298 if (!ps->netdev)
299 return -EPROBE_DEFER;
300
301 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
302
303 ds->dev = &mdiodev->dev;
304 ds->ops = &dsa_loop_driver;
305 ds->priv = ps;
306 ps->bus = mdiodev->bus;
307
308 dev_set_drvdata(&mdiodev->dev, ds);
309
310 return dsa_register_switch(ds);
311}
312
313static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
314{
315 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
316 struct dsa_loop_priv *ps = ds->priv;
317
318 dsa_unregister_switch(ds);
319 dev_put(ps->netdev);
320}
321
322static struct mdio_driver dsa_loop_drv = {
323 .mdiodrv.driver = {
324 .name = "dsa-loop",
325 },
326 .probe = dsa_loop_drv_probe,
327 .remove = dsa_loop_drv_remove,
328};
329
330#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
331
332static int __init dsa_loop_init(void)
333{
334 struct fixed_phy_status status = {
335 .link = 1,
336 .speed = SPEED_100,
337 .duplex = DUPLEX_FULL,
338 };
339 unsigned int i;
340
341 for (i = 0; i < NUM_FIXED_PHYS; i++)
342 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
343
344 return mdio_driver_register(&dsa_loop_drv);
345}
346module_init(dsa_loop_init);
347
348static void __exit dsa_loop_exit(void)
349{
350 unsigned int i;
351
352 mdio_driver_unregister(&dsa_loop_drv);
353 for (i = 0; i < NUM_FIXED_PHYS; i++)
354 if (!IS_ERR(phydevs[i]))
355 fixed_phy_unregister(phydevs[i]);
356}
357module_exit(dsa_loop_exit);
358
359MODULE_LICENSE("GPL");
360MODULE_AUTHOR("Florian Fainelli");
361MODULE_DESCRIPTION("DSA loopback driver");