tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Handling of a single switch chip, part of a switch fabric
3 *
4 * Copyright (c) 2017 Savoir-faire Linux Inc.
5 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <linux/netdevice.h>
14#include <linux/notifier.h>
15#include <linux/if_vlan.h>
16#include <net/switchdev.h>
17
18#include "dsa_priv.h"
19
20static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
21 unsigned int ageing_time)
22{
23 int i;
24
25 for (i = 0; i < ds->num_ports; ++i) {
26 struct dsa_port *dp = &ds->ports[i];
27
28 if (dp->ageing_time && dp->ageing_time < ageing_time)
29 ageing_time = dp->ageing_time;
30 }
31
32 return ageing_time;
33}
34
35static int dsa_switch_ageing_time(struct dsa_switch *ds,
36 struct dsa_notifier_ageing_time_info *info)
37{
38 unsigned int ageing_time = info->ageing_time;
39 struct switchdev_trans *trans = info->trans;
40
41 if (switchdev_trans_ph_prepare(trans)) {
42 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
43 return -ERANGE;
44 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
45 return -ERANGE;
46 return 0;
47 }
48
49 /* Program the fastest ageing time in case of multiple bridges */
50 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
51
52 if (ds->ops->set_ageing_time)
53 return ds->ops->set_ageing_time(ds, ageing_time);
54
55 return 0;
56}
57
58static int dsa_switch_bridge_join(struct dsa_switch *ds,
59 struct dsa_notifier_bridge_info *info)
60{
61 if (ds->index == info->sw_index && ds->ops->port_bridge_join)
62 return ds->ops->port_bridge_join(ds, info->port, info->br);
63
64 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
65 return ds->ops->crosschip_bridge_join(ds, info->sw_index,
66 info->port, info->br);
67
68 return 0;
69}
70
71static int dsa_switch_bridge_leave(struct dsa_switch *ds,
72 struct dsa_notifier_bridge_info *info)
73{
74 if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
75 ds->ops->port_bridge_leave(ds, info->port, info->br);
76
77 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
78 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
79 info->br);
80
81 return 0;
82}
83
84static int dsa_switch_fdb_add(struct dsa_switch *ds,
85 struct dsa_notifier_fdb_info *info)
86{
87 int port = dsa_towards_port(ds, info->sw_index, info->port);
88
89 if (!ds->ops->port_fdb_add)
90 return -EOPNOTSUPP;
91
92 return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
93}
94
95static int dsa_switch_fdb_del(struct dsa_switch *ds,
96 struct dsa_notifier_fdb_info *info)
97{
98 int port = dsa_towards_port(ds, info->sw_index, info->port);
99
100 if (!ds->ops->port_fdb_del)
101 return -EOPNOTSUPP;
102
103 return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
104}
105
106static int
107dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
108 const struct switchdev_obj_port_mdb *mdb,
109 const unsigned long *bitmap)
110{
111 int port, err;
112
113 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
114 return -EOPNOTSUPP;
115
116 for_each_set_bit(port, bitmap, ds->num_ports) {
117 err = ds->ops->port_mdb_prepare(ds, port, mdb);
118 if (err)
119 return err;
120 }
121
122 return 0;
123}
124
125static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
126 const struct switchdev_obj_port_mdb *mdb,
127 const unsigned long *bitmap)
128{
129 int port;
130
131 for_each_set_bit(port, bitmap, ds->num_ports)
132 ds->ops->port_mdb_add(ds, port, mdb);
133}
134
135static int dsa_switch_mdb_add(struct dsa_switch *ds,
136 struct dsa_notifier_mdb_info *info)
137{
138 const struct switchdev_obj_port_mdb *mdb = info->mdb;
139 struct switchdev_trans *trans = info->trans;
140 int port;
141
142 /* Build a mask of Multicast group members */
143 bitmap_zero(ds->bitmap, ds->num_ports);
144 if (ds->index == info->sw_index)
145 set_bit(info->port, ds->bitmap);
146 for (port = 0; port < ds->num_ports; port++)
147 if (dsa_is_dsa_port(ds, port))
148 set_bit(port, ds->bitmap);
149
150 if (switchdev_trans_ph_prepare(trans))
151 return dsa_switch_mdb_prepare_bitmap(ds, mdb, ds->bitmap);
152
153 dsa_switch_mdb_add_bitmap(ds, mdb, ds->bitmap);
154
155 return 0;
156}
157
158static int dsa_switch_mdb_del(struct dsa_switch *ds,
159 struct dsa_notifier_mdb_info *info)
160{
161 const struct switchdev_obj_port_mdb *mdb = info->mdb;
162
163 if (!ds->ops->port_mdb_del)
164 return -EOPNOTSUPP;
165
166 if (ds->index == info->sw_index)
167 return ds->ops->port_mdb_del(ds, info->port, mdb);
168
169 return 0;
170}
171
172static int dsa_port_vlan_device_check(struct net_device *vlan_dev,
173 int vlan_dev_vid,
174 void *arg)
175{
176 struct switchdev_obj_port_vlan *vlan = arg;
177 u16 vid;
178
179 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
180 if (vid == vlan_dev_vid)
181 return -EBUSY;
182 }
183
184 return 0;
185}
186
187static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
188 const struct switchdev_obj_port_vlan *vlan)
189{
190 const struct dsa_port *dp = dsa_to_port(ds, port);
191 int err = 0;
192
193 /* Device is not bridged, let it proceed with the VLAN device
194 * creation.
195 */
196 if (!dp->bridge_dev)
197 return err;
198
199 /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare pharse and
200 * already checks whether there is an overlapping bridge VLAN entry
201 * with the same VID, so here we only need to check that if we are
202 * adding a bridge VLAN entry there is not an overlapping VLAN device
203 * claiming that VID.
204 */
205 return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
206 (void *)vlan);
207}
208
209static int
210dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
211 const struct switchdev_obj_port_vlan *vlan,
212 const unsigned long *bitmap)
213{
214 int port, err;
215
216 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
217 return -EOPNOTSUPP;
218
219 for_each_set_bit(port, bitmap, ds->num_ports) {
220 err = dsa_port_vlan_check(ds, port, vlan);
221 if (err)
222 return err;
223
224 err = ds->ops->port_vlan_prepare(ds, port, vlan);
225 if (err)
226 return err;
227 }
228
229 return 0;
230}
231
232static void
233dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
234 const struct switchdev_obj_port_vlan *vlan,
235 const unsigned long *bitmap)
236{
237 int port;
238
239 for_each_set_bit(port, bitmap, ds->num_ports)
240 ds->ops->port_vlan_add(ds, port, vlan);
241}
242
243static int dsa_switch_vlan_add(struct dsa_switch *ds,
244 struct dsa_notifier_vlan_info *info)
245{
246 const struct switchdev_obj_port_vlan *vlan = info->vlan;
247 struct switchdev_trans *trans = info->trans;
248 int port;
249
250 /* Build a mask of VLAN members */
251 bitmap_zero(ds->bitmap, ds->num_ports);
252 if (ds->index == info->sw_index)
253 set_bit(info->port, ds->bitmap);
254 for (port = 0; port < ds->num_ports; port++)
255 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
256 set_bit(port, ds->bitmap);
257
258 if (switchdev_trans_ph_prepare(trans))
259 return dsa_switch_vlan_prepare_bitmap(ds, vlan, ds->bitmap);
260
261 dsa_switch_vlan_add_bitmap(ds, vlan, ds->bitmap);
262
263 return 0;
264}
265
266static int dsa_switch_vlan_del(struct dsa_switch *ds,
267 struct dsa_notifier_vlan_info *info)
268{
269 const struct switchdev_obj_port_vlan *vlan = info->vlan;
270
271 if (!ds->ops->port_vlan_del)
272 return -EOPNOTSUPP;
273
274 if (ds->index == info->sw_index)
275 return ds->ops->port_vlan_del(ds, info->port, vlan);
276
277 return 0;
278}
279
280static int dsa_switch_event(struct notifier_block *nb,
281 unsigned long event, void *info)
282{
283 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
284 int err;
285
286 switch (event) {
287 case DSA_NOTIFIER_AGEING_TIME:
288 err = dsa_switch_ageing_time(ds, info);
289 break;
290 case DSA_NOTIFIER_BRIDGE_JOIN:
291 err = dsa_switch_bridge_join(ds, info);
292 break;
293 case DSA_NOTIFIER_BRIDGE_LEAVE:
294 err = dsa_switch_bridge_leave(ds, info);
295 break;
296 case DSA_NOTIFIER_FDB_ADD:
297 err = dsa_switch_fdb_add(ds, info);
298 break;
299 case DSA_NOTIFIER_FDB_DEL:
300 err = dsa_switch_fdb_del(ds, info);
301 break;
302 case DSA_NOTIFIER_MDB_ADD:
303 err = dsa_switch_mdb_add(ds, info);
304 break;
305 case DSA_NOTIFIER_MDB_DEL:
306 err = dsa_switch_mdb_del(ds, info);
307 break;
308 case DSA_NOTIFIER_VLAN_ADD:
309 err = dsa_switch_vlan_add(ds, info);
310 break;
311 case DSA_NOTIFIER_VLAN_DEL:
312 err = dsa_switch_vlan_del(ds, info);
313 break;
314 default:
315 err = -EOPNOTSUPP;
316 break;
317 }
318
319 /* Non-switchdev operations cannot be rolled back. If a DSA driver
320 * returns an error during the chained call, switch chips may be in an
321 * inconsistent state.
322 */
323 if (err)
324 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
325 event, err);
326
327 return notifier_from_errno(err);
328}
329
330int dsa_switch_register_notifier(struct dsa_switch *ds)
331{
332 ds->nb.notifier_call = dsa_switch_event;
333
334 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
335}
336
337void dsa_switch_unregister_notifier(struct dsa_switch *ds)
338{
339 int err;
340
341 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
342 if (err)
343 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
344}