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98cd1552 FF |
1 | /* |
2 | * Distributed Switch Architecture loopback driver | |
3 | * | |
4 | * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/platform_device.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/phy.h> | |
15 | #include <linux/phy_fixed.h> | |
16 | #include <linux/export.h> | |
17 | #include <linux/workqueue.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/if_bridge.h> | |
98cd1552 FF |
20 | #include <net/dsa.h> |
21 | ||
22 | #include "dsa_loop.h" | |
23 | ||
24 | struct dsa_loop_vlan { | |
25 | u16 members; | |
26 | u16 untagged; | |
27 | }; | |
28 | ||
29 | #define DSA_LOOP_VLANS 5 | |
30 | ||
31 | struct dsa_loop_priv { | |
32 | struct mii_bus *bus; | |
33 | unsigned int port_base; | |
34 | struct dsa_loop_vlan vlans[DSA_LOOP_VLANS]; | |
35 | struct net_device *netdev; | |
36 | u16 pvid; | |
37 | }; | |
38 | ||
39 | static struct phy_device *phydevs[PHY_MAX_ADDR]; | |
40 | ||
41 | static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds) | |
42 | { | |
43 | dev_dbg(ds->dev, "%s\n", __func__); | |
44 | ||
45 | return DSA_TAG_PROTO_NONE; | |
46 | } | |
47 | ||
48 | static int dsa_loop_setup(struct dsa_switch *ds) | |
49 | { | |
50 | dev_dbg(ds->dev, "%s\n", __func__); | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int dsa_loop_set_addr(struct dsa_switch *ds, u8 *addr) | |
56 | { | |
57 | dev_dbg(ds->dev, "%s\n", __func__); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum) | |
63 | { | |
64 | struct dsa_loop_priv *ps = ds->priv; | |
65 | struct mii_bus *bus = ps->bus; | |
66 | ||
67 | dev_dbg(ds->dev, "%s\n", __func__); | |
68 | ||
69 | return mdiobus_read_nested(bus, ps->port_base + port, regnum); | |
70 | } | |
71 | ||
72 | static int dsa_loop_phy_write(struct dsa_switch *ds, int port, | |
73 | int regnum, u16 value) | |
74 | { | |
75 | struct dsa_loop_priv *ps = ds->priv; | |
76 | struct mii_bus *bus = ps->bus; | |
77 | ||
78 | dev_dbg(ds->dev, "%s\n", __func__); | |
79 | ||
80 | return mdiobus_write_nested(bus, ps->port_base + port, regnum, value); | |
81 | } | |
82 | ||
83 | static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port, | |
84 | struct net_device *bridge) | |
85 | { | |
86 | dev_dbg(ds->dev, "%s\n", __func__); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, | |
92 | struct net_device *bridge) | |
93 | { | |
94 | dev_dbg(ds->dev, "%s\n", __func__); | |
95 | } | |
96 | ||
97 | static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port, | |
98 | u8 state) | |
99 | { | |
100 | dev_dbg(ds->dev, "%s\n", __func__); | |
101 | } | |
102 | ||
103 | static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port, | |
104 | bool vlan_filtering) | |
105 | { | |
106 | dev_dbg(ds->dev, "%s\n", __func__); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port, | |
112 | const struct switchdev_obj_port_vlan *vlan, | |
113 | struct switchdev_trans *trans) | |
114 | { | |
115 | struct dsa_loop_priv *ps = ds->priv; | |
116 | struct mii_bus *bus = ps->bus; | |
117 | ||
118 | dev_dbg(ds->dev, "%s\n", __func__); | |
119 | ||
120 | /* Just do a sleeping operation to make lockdep checks effective */ | |
121 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
122 | ||
123 | if (vlan->vid_end > DSA_LOOP_VLANS) | |
124 | return -ERANGE; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, | |
130 | const struct switchdev_obj_port_vlan *vlan, | |
131 | struct switchdev_trans *trans) | |
132 | { | |
133 | bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; | |
134 | bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; | |
135 | struct dsa_loop_priv *ps = ds->priv; | |
136 | struct mii_bus *bus = ps->bus; | |
137 | struct dsa_loop_vlan *vl; | |
138 | u16 vid; | |
139 | ||
140 | dev_dbg(ds->dev, "%s\n", __func__); | |
141 | ||
142 | /* Just do a sleeping operation to make lockdep checks effective */ | |
143 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
144 | ||
145 | for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { | |
146 | vl = &ps->vlans[vid]; | |
147 | ||
148 | vl->members |= BIT(port); | |
149 | if (untagged) | |
150 | vl->untagged |= BIT(port); | |
151 | else | |
152 | vl->untagged &= ~BIT(port); | |
153 | } | |
154 | ||
155 | if (pvid) | |
156 | ps->pvid = vid; | |
157 | } | |
158 | ||
159 | static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, | |
160 | const struct switchdev_obj_port_vlan *vlan) | |
161 | { | |
162 | bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; | |
163 | struct dsa_loop_priv *ps = ds->priv; | |
164 | struct mii_bus *bus = ps->bus; | |
165 | struct dsa_loop_vlan *vl; | |
5865ccce | 166 | u16 vid, pvid = ps->pvid; |
98cd1552 FF |
167 | |
168 | dev_dbg(ds->dev, "%s\n", __func__); | |
169 | ||
170 | /* Just do a sleeping operation to make lockdep checks effective */ | |
171 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
172 | ||
173 | for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { | |
174 | vl = &ps->vlans[vid]; | |
175 | ||
176 | vl->members &= ~BIT(port); | |
177 | if (untagged) | |
178 | vl->untagged &= ~BIT(port); | |
179 | ||
180 | if (pvid == vid) | |
181 | pvid = 1; | |
182 | } | |
183 | ps->pvid = pvid; | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int dsa_loop_port_vlan_dump(struct dsa_switch *ds, int port, | |
189 | struct switchdev_obj_port_vlan *vlan, | |
438ff537 | 190 | switchdev_obj_dump_cb_t *cb) |
98cd1552 FF |
191 | { |
192 | struct dsa_loop_priv *ps = ds->priv; | |
193 | struct mii_bus *bus = ps->bus; | |
194 | struct dsa_loop_vlan *vl; | |
195 | u16 vid, vid_start = 0; | |
d1db799e | 196 | int err = 0; |
98cd1552 FF |
197 | |
198 | dev_dbg(ds->dev, "%s\n", __func__); | |
199 | ||
200 | /* Just do a sleeping operation to make lockdep checks effective */ | |
201 | mdiobus_read(bus, ps->port_base + port, MII_BMSR); | |
202 | ||
203 | for (vid = vid_start; vid < DSA_LOOP_VLANS; vid++) { | |
204 | vl = &ps->vlans[vid]; | |
205 | ||
206 | if (!(vl->members & BIT(port))) | |
207 | continue; | |
208 | ||
209 | vlan->vid_begin = vlan->vid_end = vid; | |
210 | vlan->flags = 0; | |
211 | ||
212 | if (vl->untagged & BIT(port)) | |
213 | vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED; | |
214 | if (ps->pvid == vid) | |
215 | vlan->flags |= BRIDGE_VLAN_INFO_PVID; | |
216 | ||
217 | err = cb(&vlan->obj); | |
218 | if (err) | |
219 | break; | |
220 | } | |
221 | ||
222 | return err; | |
223 | } | |
224 | ||
225 | static struct dsa_switch_ops dsa_loop_driver = { | |
226 | .get_tag_protocol = dsa_loop_get_protocol, | |
227 | .setup = dsa_loop_setup, | |
228 | .set_addr = dsa_loop_set_addr, | |
229 | .phy_read = dsa_loop_phy_read, | |
230 | .phy_write = dsa_loop_phy_write, | |
231 | .port_bridge_join = dsa_loop_port_bridge_join, | |
232 | .port_bridge_leave = dsa_loop_port_bridge_leave, | |
233 | .port_stp_state_set = dsa_loop_port_stp_state_set, | |
234 | .port_vlan_filtering = dsa_loop_port_vlan_filtering, | |
235 | .port_vlan_prepare = dsa_loop_port_vlan_prepare, | |
236 | .port_vlan_add = dsa_loop_port_vlan_add, | |
237 | .port_vlan_del = dsa_loop_port_vlan_del, | |
238 | .port_vlan_dump = dsa_loop_port_vlan_dump, | |
239 | }; | |
240 | ||
241 | static int dsa_loop_drv_probe(struct mdio_device *mdiodev) | |
242 | { | |
243 | struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; | |
244 | struct dsa_loop_priv *ps; | |
245 | struct dsa_switch *ds; | |
246 | ||
247 | if (!pdata) | |
248 | return -ENODEV; | |
249 | ||
250 | dev_info(&mdiodev->dev, "%s: 0x%0x\n", | |
251 | pdata->name, pdata->enabled_ports); | |
252 | ||
253 | ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS); | |
254 | if (!ds) | |
255 | return -ENOMEM; | |
256 | ||
257 | ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); | |
8ce7aaaa CJ |
258 | if (!ps) |
259 | return -ENOMEM; | |
260 | ||
98cd1552 FF |
261 | ps->netdev = dev_get_by_name(&init_net, pdata->netdev); |
262 | if (!ps->netdev) | |
263 | return -EPROBE_DEFER; | |
264 | ||
265 | pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; | |
266 | ||
267 | ds->dev = &mdiodev->dev; | |
268 | ds->ops = &dsa_loop_driver; | |
269 | ds->priv = ps; | |
270 | ps->bus = mdiodev->bus; | |
271 | ||
272 | dev_set_drvdata(&mdiodev->dev, ds); | |
273 | ||
23c9ee49 | 274 | return dsa_register_switch(ds); |
98cd1552 FF |
275 | } |
276 | ||
277 | static void dsa_loop_drv_remove(struct mdio_device *mdiodev) | |
278 | { | |
279 | struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); | |
280 | struct dsa_loop_priv *ps = ds->priv; | |
281 | ||
282 | dsa_unregister_switch(ds); | |
283 | dev_put(ps->netdev); | |
284 | } | |
285 | ||
286 | static struct mdio_driver dsa_loop_drv = { | |
287 | .mdiodrv.driver = { | |
288 | .name = "dsa-loop", | |
289 | }, | |
290 | .probe = dsa_loop_drv_probe, | |
291 | .remove = dsa_loop_drv_remove, | |
292 | }; | |
293 | ||
294 | #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) | |
295 | ||
98cd1552 FF |
296 | static int __init dsa_loop_init(void) |
297 | { | |
298 | struct fixed_phy_status status = { | |
299 | .link = 1, | |
300 | .speed = SPEED_100, | |
301 | .duplex = DUPLEX_FULL, | |
302 | }; | |
303 | unsigned int i; | |
304 | ||
305 | for (i = 0; i < NUM_FIXED_PHYS; i++) | |
306 | phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL); | |
307 | ||
308 | return mdio_driver_register(&dsa_loop_drv); | |
309 | } | |
310 | module_init(dsa_loop_init); | |
311 | ||
312 | static void __exit dsa_loop_exit(void) | |
313 | { | |
3407dc8e FF |
314 | unsigned int i; |
315 | ||
98cd1552 | 316 | mdio_driver_unregister(&dsa_loop_drv); |
3407dc8e FF |
317 | for (i = 0; i < NUM_FIXED_PHYS; i++) |
318 | if (phydevs[i]) | |
319 | fixed_phy_unregister(phydevs[i]); | |
98cd1552 FF |
320 | } |
321 | module_exit(dsa_loop_exit); | |
322 | ||
323 | MODULE_LICENSE("GPL"); | |
324 | MODULE_AUTHOR("Florian Fainelli"); | |
325 | MODULE_DESCRIPTION("DSA loopback driver"); |