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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
98cd1552 FF |
2 | /* |
3 | * Distributed Switch Architecture loopback driver | |
4 | * | |
5 | * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com> | |
98cd1552 FF |
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> | |
484c0172 | 13 | #include <linux/ethtool.h> |
98cd1552 FF |
14 | #include <linux/workqueue.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/if_bridge.h> | |
98cd1552 FF |
17 | #include <net/dsa.h> |
18 | ||
19 | #include "dsa_loop.h" | |
20 | ||
21 | struct dsa_loop_vlan { | |
22 | u16 members; | |
23 | u16 untagged; | |
24 | }; | |
25 | ||
484c0172 FF |
26 | struct dsa_loop_mib_entry { |
27 | char name[ETH_GSTRING_LEN]; | |
28 | unsigned long val; | |
29 | }; | |
30 | ||
31 | enum 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 | ||
39 | static 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 | ||
46 | struct dsa_loop_port { | |
47 | struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX]; | |
48 | }; | |
49 | ||
98cd1552 FF |
50 | #define DSA_LOOP_VLANS 5 |
51 | ||
52 | struct 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; | |
484c0172 | 57 | struct dsa_loop_port ports[DSA_MAX_PORTS]; |
98cd1552 FF |
58 | u16 pvid; |
59 | }; | |
60 | ||
61 | static struct phy_device *phydevs[PHY_MAX_ADDR]; | |
62 | ||
5ed4e3eb | 63 | static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds, |
4d776482 FF |
64 | int port, |
65 | enum dsa_tag_protocol mp) | |
98cd1552 | 66 | { |
e52cde71 | 67 | dev_dbg(ds->dev, "%s: port: %d\n", __func__, port); |
98cd1552 FF |
68 | |
69 | return DSA_TAG_PROTO_NONE; | |
70 | } | |
71 | ||
72 | static int dsa_loop_setup(struct dsa_switch *ds) | |
73 | { | |
484c0172 FF |
74 | struct dsa_loop_priv *ps = ds->priv; |
75 | unsigned int i; | |
76 | ||
77 | for (i = 0; i < ds->num_ports; i++) | |
78 | memcpy(ps->ports[i].mib, dsa_loop_mibs, | |
79 | sizeof(dsa_loop_mibs)); | |
80 | ||
98cd1552 FF |
81 | dev_dbg(ds->dev, "%s\n", __func__); |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
89f09048 | 86 | static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset) |
484c0172 | 87 | { |
96cbddcd | 88 | if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS) |
89f09048 FF |
89 | return 0; |
90 | ||
484c0172 FF |
91 | return __DSA_LOOP_CNT_MAX; |
92 | } | |
93 | ||
89f09048 FF |
94 | static void dsa_loop_get_strings(struct dsa_switch *ds, int port, |
95 | u32 stringset, uint8_t *data) | |
484c0172 FF |
96 | { |
97 | struct dsa_loop_priv *ps = ds->priv; | |
98 | unsigned int i; | |
99 | ||
96cbddcd | 100 | if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS) |
89f09048 FF |
101 | return; |
102 | ||
484c0172 FF |
103 | for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) |
104 | memcpy(data + i * ETH_GSTRING_LEN, | |
105 | ps->ports[port].mib[i].name, ETH_GSTRING_LEN); | |
106 | } | |
107 | ||
108 | static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port, | |
109 | uint64_t *data) | |
110 | { | |
111 | struct dsa_loop_priv *ps = ds->priv; | |
112 | unsigned int i; | |
113 | ||
114 | for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) | |
115 | data[i] = ps->ports[port].mib[i].val; | |
116 | } | |
117 | ||
98cd1552 FF |
118 | static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum) |
119 | { | |
120 | struct dsa_loop_priv *ps = ds->priv; | |
121 | struct mii_bus *bus = ps->bus; | |
484c0172 | 122 | int ret; |
98cd1552 | 123 | |
484c0172 FF |
124 | ret = mdiobus_read_nested(bus, ps->port_base + port, regnum); |
125 | if (ret < 0) | |
126 | ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++; | |
127 | else | |
128 | ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++; | |
129 | ||
130 | return ret; | |
98cd1552 FF |
131 | } |
132 | ||
133 | static int dsa_loop_phy_write(struct dsa_switch *ds, int port, | |
134 | int regnum, u16 value) | |
135 | { | |
136 | struct dsa_loop_priv *ps = ds->priv; | |
137 | struct mii_bus *bus = ps->bus; | |
484c0172 | 138 | int ret; |
98cd1552 | 139 | |
484c0172 FF |
140 | ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value); |
141 | if (ret < 0) | |
142 | ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++; | |
143 | else | |
144 | ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++; | |
145 | ||
146 | return ret; | |
98cd1552 FF |
147 | } |
148 | ||
149 | static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port, | |
150 | struct net_device *bridge) | |
151 | { | |
e52cde71 FF |
152 | dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", |
153 | __func__, port, bridge->name); | |
98cd1552 FF |
154 | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, | |
159 | struct net_device *bridge) | |
160 | { | |
e52cde71 FF |
161 | dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", |
162 | __func__, port, bridge->name); | |
98cd1552 FF |
163 | } |
164 | ||
165 | static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port, | |
166 | u8 state) | |
167 | { | |
e52cde71 FF |
168 | dev_dbg(ds->dev, "%s: port: %d, state: %d\n", |
169 | __func__, port, state); | |
98cd1552 FF |
170 | } |
171 | ||
172 | static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port, | |
173 | bool vlan_filtering) | |
174 | { | |
e52cde71 FF |
175 | dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n", |
176 | __func__, port, vlan_filtering); | |
98cd1552 FF |
177 | |
178 | return 0; | |
179 | } | |
180 | ||
80e02360 VD |
181 | static int |
182 | dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port, | |
183 | const struct switchdev_obj_port_vlan *vlan) | |
98cd1552 FF |
184 | { |
185 | struct dsa_loop_priv *ps = ds->priv; | |
186 | struct mii_bus *bus = ps->bus; | |
187 | ||
e52cde71 FF |
188 | dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d", |
189 | __func__, port, vlan->vid_begin, vlan->vid_end); | |
98cd1552 FF |
190 | |
191 | /* Just do a sleeping operation to make lockdep checks effective */ | |
192 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
193 | ||
194 | if (vlan->vid_end > DSA_LOOP_VLANS) | |
195 | return -ERANGE; | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, | |
80e02360 | 201 | const struct switchdev_obj_port_vlan *vlan) |
98cd1552 FF |
202 | { |
203 | bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; | |
204 | bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; | |
205 | struct dsa_loop_priv *ps = ds->priv; | |
206 | struct mii_bus *bus = ps->bus; | |
207 | struct dsa_loop_vlan *vl; | |
208 | u16 vid; | |
209 | ||
98cd1552 FF |
210 | /* Just do a sleeping operation to make lockdep checks effective */ |
211 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
212 | ||
213 | for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { | |
214 | vl = &ps->vlans[vid]; | |
215 | ||
216 | vl->members |= BIT(port); | |
217 | if (untagged) | |
218 | vl->untagged |= BIT(port); | |
219 | else | |
220 | vl->untagged &= ~BIT(port); | |
e52cde71 FF |
221 | |
222 | dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", | |
223 | __func__, port, vid, untagged ? "un" : "", pvid); | |
98cd1552 FF |
224 | } |
225 | ||
226 | if (pvid) | |
227 | ps->pvid = vid; | |
228 | } | |
229 | ||
230 | static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, | |
231 | const struct switchdev_obj_port_vlan *vlan) | |
232 | { | |
233 | bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; | |
234 | struct dsa_loop_priv *ps = ds->priv; | |
235 | struct mii_bus *bus = ps->bus; | |
236 | struct dsa_loop_vlan *vl; | |
5865ccce | 237 | u16 vid, pvid = ps->pvid; |
98cd1552 | 238 | |
98cd1552 FF |
239 | /* Just do a sleeping operation to make lockdep checks effective */ |
240 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
241 | ||
242 | for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { | |
243 | vl = &ps->vlans[vid]; | |
244 | ||
245 | vl->members &= ~BIT(port); | |
246 | if (untagged) | |
247 | vl->untagged &= ~BIT(port); | |
248 | ||
249 | if (pvid == vid) | |
250 | pvid = 1; | |
e52cde71 FF |
251 | |
252 | dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", | |
253 | __func__, port, vid, untagged ? "un" : "", pvid); | |
98cd1552 FF |
254 | } |
255 | ps->pvid = pvid; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
d78d6776 | 260 | static const struct dsa_switch_ops dsa_loop_driver = { |
98cd1552 FF |
261 | .get_tag_protocol = dsa_loop_get_protocol, |
262 | .setup = dsa_loop_setup, | |
484c0172 FF |
263 | .get_strings = dsa_loop_get_strings, |
264 | .get_ethtool_stats = dsa_loop_get_ethtool_stats, | |
265 | .get_sset_count = dsa_loop_get_sset_count, | |
96cbddcd | 266 | .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats, |
98cd1552 FF |
267 | .phy_read = dsa_loop_phy_read, |
268 | .phy_write = dsa_loop_phy_write, | |
269 | .port_bridge_join = dsa_loop_port_bridge_join, | |
270 | .port_bridge_leave = dsa_loop_port_bridge_leave, | |
271 | .port_stp_state_set = dsa_loop_port_stp_state_set, | |
272 | .port_vlan_filtering = dsa_loop_port_vlan_filtering, | |
273 | .port_vlan_prepare = dsa_loop_port_vlan_prepare, | |
274 | .port_vlan_add = dsa_loop_port_vlan_add, | |
275 | .port_vlan_del = dsa_loop_port_vlan_del, | |
98cd1552 FF |
276 | }; |
277 | ||
278 | static int dsa_loop_drv_probe(struct mdio_device *mdiodev) | |
279 | { | |
280 | struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; | |
281 | struct dsa_loop_priv *ps; | |
282 | struct dsa_switch *ds; | |
283 | ||
284 | if (!pdata) | |
285 | return -ENODEV; | |
286 | ||
287 | dev_info(&mdiodev->dev, "%s: 0x%0x\n", | |
288 | pdata->name, pdata->enabled_ports); | |
289 | ||
7e99e347 | 290 | ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL); |
98cd1552 FF |
291 | if (!ds) |
292 | return -ENOMEM; | |
293 | ||
7e99e347 VD |
294 | ds->dev = &mdiodev->dev; |
295 | ds->num_ports = DSA_MAX_PORTS; | |
296 | ||
98cd1552 | 297 | ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); |
8ce7aaaa CJ |
298 | if (!ps) |
299 | return -ENOMEM; | |
300 | ||
98cd1552 FF |
301 | ps->netdev = dev_get_by_name(&init_net, pdata->netdev); |
302 | if (!ps->netdev) | |
303 | return -EPROBE_DEFER; | |
304 | ||
305 | pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; | |
306 | ||
307 | ds->dev = &mdiodev->dev; | |
308 | ds->ops = &dsa_loop_driver; | |
309 | ds->priv = ps; | |
310 | ps->bus = mdiodev->bus; | |
311 | ||
312 | dev_set_drvdata(&mdiodev->dev, ds); | |
313 | ||
23c9ee49 | 314 | return dsa_register_switch(ds); |
98cd1552 FF |
315 | } |
316 | ||
317 | static void dsa_loop_drv_remove(struct mdio_device *mdiodev) | |
318 | { | |
319 | struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); | |
320 | struct dsa_loop_priv *ps = ds->priv; | |
321 | ||
322 | dsa_unregister_switch(ds); | |
323 | dev_put(ps->netdev); | |
324 | } | |
325 | ||
326 | static struct mdio_driver dsa_loop_drv = { | |
327 | .mdiodrv.driver = { | |
328 | .name = "dsa-loop", | |
329 | }, | |
330 | .probe = dsa_loop_drv_probe, | |
331 | .remove = dsa_loop_drv_remove, | |
332 | }; | |
333 | ||
334 | #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) | |
335 | ||
98cd1552 FF |
336 | static int __init dsa_loop_init(void) |
337 | { | |
338 | struct fixed_phy_status status = { | |
339 | .link = 1, | |
340 | .speed = SPEED_100, | |
341 | .duplex = DUPLEX_FULL, | |
342 | }; | |
343 | unsigned int i; | |
344 | ||
345 | for (i = 0; i < NUM_FIXED_PHYS; i++) | |
5468e82f | 346 | phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL); |
98cd1552 FF |
347 | |
348 | return mdio_driver_register(&dsa_loop_drv); | |
349 | } | |
350 | module_init(dsa_loop_init); | |
351 | ||
352 | static void __exit dsa_loop_exit(void) | |
353 | { | |
3407dc8e FF |
354 | unsigned int i; |
355 | ||
98cd1552 | 356 | mdio_driver_unregister(&dsa_loop_drv); |
3407dc8e | 357 | for (i = 0; i < NUM_FIXED_PHYS; i++) |
6d9c153a | 358 | if (!IS_ERR(phydevs[i])) |
3407dc8e | 359 | fixed_phy_unregister(phydevs[i]); |
98cd1552 FF |
360 | } |
361 | module_exit(dsa_loop_exit); | |
362 | ||
363 | MODULE_LICENSE("GPL"); | |
364 | MODULE_AUTHOR("Florian Fainelli"); | |
365 | MODULE_DESCRIPTION("DSA loopback driver"); |