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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 <net/switchdev.h>
16
17#include "dsa_priv.h"
18
19static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
20 unsigned int ageing_time)
21{
22 int i;
23
24 for (i = 0; i < ds->num_ports; ++i) {
25 struct dsa_port *dp = &ds->ports[i];
26
27 if (dp->ageing_time && dp->ageing_time < ageing_time)
28 ageing_time = dp->ageing_time;
29 }
30
31 return ageing_time;
32}
33
34static int dsa_switch_ageing_time(struct dsa_switch *ds,
35 struct dsa_notifier_ageing_time_info *info)
36{
37 unsigned int ageing_time = info->ageing_time;
38 struct switchdev_trans *trans = info->trans;
39
40 if (switchdev_trans_ph_prepare(trans)) {
41 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
42 return -ERANGE;
43 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
44 return -ERANGE;
45 return 0;
46 }
47
48 /* Program the fastest ageing time in case of multiple bridges */
49 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
50
51 if (ds->ops->set_ageing_time)
52 return ds->ops->set_ageing_time(ds, ageing_time);
53
54 return 0;
55}
56
57static int dsa_switch_bridge_join(struct dsa_switch *ds,
58 struct dsa_notifier_bridge_info *info)
59{
60 if (ds->index == info->sw_index && ds->ops->port_bridge_join)
61 return ds->ops->port_bridge_join(ds, info->port, info->br);
62
63 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
64 return ds->ops->crosschip_bridge_join(ds, info->sw_index,
65 info->port, info->br);
66
67 return 0;
68}
69
70static int dsa_switch_bridge_leave(struct dsa_switch *ds,
71 struct dsa_notifier_bridge_info *info)
72{
73 if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
74 ds->ops->port_bridge_leave(ds, info->port, info->br);
75
76 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
77 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
78 info->br);
79
80 return 0;
81}
82
83static int dsa_switch_fdb_add(struct dsa_switch *ds,
84 struct dsa_notifier_fdb_info *info)
85{
86 int port = dsa_towards_port(ds, info->sw_index, info->port);
87
88 if (!ds->ops->port_fdb_add)
89 return -EOPNOTSUPP;
90
91 return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
92}
93
94static int dsa_switch_fdb_del(struct dsa_switch *ds,
95 struct dsa_notifier_fdb_info *info)
96{
97 int port = dsa_towards_port(ds, info->sw_index, info->port);
98
99 if (!ds->ops->port_fdb_del)
100 return -EOPNOTSUPP;
101
102 return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
103}
104
105static int
106dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
107 const struct switchdev_obj_port_mdb *mdb,
108 const unsigned long *bitmap)
109{
110 int port, err;
111
112 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
113 return -EOPNOTSUPP;
114
115 for_each_set_bit(port, bitmap, ds->num_ports) {
116 err = ds->ops->port_mdb_prepare(ds, port, mdb);
117 if (err)
118 return err;
119 }
120
121 return 0;
122}
123
124static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
125 const struct switchdev_obj_port_mdb *mdb,
126 const unsigned long *bitmap)
127{
128 int port;
129
130 for_each_set_bit(port, bitmap, ds->num_ports)
131 ds->ops->port_mdb_add(ds, port, mdb);
132}
133
134static int dsa_switch_mdb_add(struct dsa_switch *ds,
135 struct dsa_notifier_mdb_info *info)
136{
137 const struct switchdev_obj_port_mdb *mdb = info->mdb;
138 struct switchdev_trans *trans = info->trans;
139 DECLARE_BITMAP(group, ds->num_ports);
140 int port;
141
142 /* Build a mask of Multicast group members */
143 bitmap_zero(group, ds->num_ports);
144 if (ds->index == info->sw_index)
145 set_bit(info->port, group);
146 for (port = 0; port < ds->num_ports; port++)
147 if (dsa_is_dsa_port(ds, port))
148 set_bit(port, group);
149
150 if (switchdev_trans_ph_prepare(trans))
151 return dsa_switch_mdb_prepare_bitmap(ds, mdb, group);
152
153 dsa_switch_mdb_add_bitmap(ds, mdb, group);
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
173dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
174 const struct switchdev_obj_port_vlan *vlan,
175 const unsigned long *bitmap)
176{
177 int port, err;
178
179 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
180 return -EOPNOTSUPP;
181
182 for_each_set_bit(port, bitmap, ds->num_ports) {
183 err = ds->ops->port_vlan_prepare(ds, port, vlan);
184 if (err)
185 return err;
186 }
187
188 return 0;
189}
190
191static void
192dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
193 const struct switchdev_obj_port_vlan *vlan,
194 const unsigned long *bitmap)
195{
196 int port;
197
198 for_each_set_bit(port, bitmap, ds->num_ports)
199 ds->ops->port_vlan_add(ds, port, vlan);
200}
201
202static int dsa_switch_vlan_add(struct dsa_switch *ds,
203 struct dsa_notifier_vlan_info *info)
204{
205 const struct switchdev_obj_port_vlan *vlan = info->vlan;
206 struct switchdev_trans *trans = info->trans;
207 DECLARE_BITMAP(members, ds->num_ports);
208 int port;
209
210 /* Build a mask of VLAN members */
211 bitmap_zero(members, ds->num_ports);
212 if (ds->index == info->sw_index)
213 set_bit(info->port, members);
214 for (port = 0; port < ds->num_ports; port++)
215 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
216 set_bit(port, members);
217
218 if (switchdev_trans_ph_prepare(trans))
219 return dsa_switch_vlan_prepare_bitmap(ds, vlan, members);
220
221 dsa_switch_vlan_add_bitmap(ds, vlan, members);
222
223 return 0;
224}
225
226static int dsa_switch_vlan_del(struct dsa_switch *ds,
227 struct dsa_notifier_vlan_info *info)
228{
229 const struct switchdev_obj_port_vlan *vlan = info->vlan;
230
231 if (!ds->ops->port_vlan_del)
232 return -EOPNOTSUPP;
233
234 if (ds->index == info->sw_index)
235 return ds->ops->port_vlan_del(ds, info->port, vlan);
236
237 return 0;
238}
239
240static int dsa_switch_event(struct notifier_block *nb,
241 unsigned long event, void *info)
242{
243 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
244 int err;
245
246 switch (event) {
247 case DSA_NOTIFIER_AGEING_TIME:
248 err = dsa_switch_ageing_time(ds, info);
249 break;
250 case DSA_NOTIFIER_BRIDGE_JOIN:
251 err = dsa_switch_bridge_join(ds, info);
252 break;
253 case DSA_NOTIFIER_BRIDGE_LEAVE:
254 err = dsa_switch_bridge_leave(ds, info);
255 break;
256 case DSA_NOTIFIER_FDB_ADD:
257 err = dsa_switch_fdb_add(ds, info);
258 break;
259 case DSA_NOTIFIER_FDB_DEL:
260 err = dsa_switch_fdb_del(ds, info);
261 break;
262 case DSA_NOTIFIER_MDB_ADD:
263 err = dsa_switch_mdb_add(ds, info);
264 break;
265 case DSA_NOTIFIER_MDB_DEL:
266 err = dsa_switch_mdb_del(ds, info);
267 break;
268 case DSA_NOTIFIER_VLAN_ADD:
269 err = dsa_switch_vlan_add(ds, info);
270 break;
271 case DSA_NOTIFIER_VLAN_DEL:
272 err = dsa_switch_vlan_del(ds, info);
273 break;
274 default:
275 err = -EOPNOTSUPP;
276 break;
277 }
278
279 /* Non-switchdev operations cannot be rolled back. If a DSA driver
280 * returns an error during the chained call, switch chips may be in an
281 * inconsistent state.
282 */
283 if (err)
284 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
285 event, err);
286
287 return notifier_from_errno(err);
288}
289
290int dsa_switch_register_notifier(struct dsa_switch *ds)
291{
292 ds->nb.notifier_call = dsa_switch_event;
293
294 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
295}
296
297void dsa_switch_unregister_notifier(struct dsa_switch *ds)
298{
299 int err;
300
301 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
302 if (err)
303 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
304}