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f515f192 VD |
1 | /* |
2 | * Handling of a single switch chip, part of a switch fabric | |
3 | * | |
4333d619 VD |
4 | * Copyright (c) 2017 Savoir-faire Linux Inc. |
5 | * Vivien Didelot <vivien.didelot@savoirfairelinux.com> | |
f515f192 VD |
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> | |
1faabf74 | 15 | #include <net/switchdev.h> |
ea5dd34b VD |
16 | |
17 | #include "dsa_priv.h" | |
f515f192 | 18 | |
1faabf74 VD |
19 | static 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 | ||
34 | static 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 | ||
1faabf74 VD |
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 | ||
04d3a4c6 VD |
57 | static 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 | ||
40ef2c93 VD |
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); | |
04d3a4c6 VD |
66 | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static 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 | ||
40ef2c93 VD |
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); | |
04d3a4c6 VD |
79 | |
80 | return 0; | |
81 | } | |
82 | ||
685fb6a4 VD |
83 | static int dsa_switch_fdb_add(struct dsa_switch *ds, |
84 | struct dsa_notifier_fdb_info *info) | |
85 | { | |
86 | const struct switchdev_obj_port_fdb *fdb = info->fdb; | |
87 | struct switchdev_trans *trans = info->trans; | |
88 | ||
89 | /* Do not care yet about other switch chips of the fabric */ | |
90 | if (ds->index != info->sw_index) | |
91 | return 0; | |
92 | ||
93 | if (switchdev_trans_ph_prepare(trans)) { | |
94 | if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add) | |
95 | return -EOPNOTSUPP; | |
96 | ||
97 | return ds->ops->port_fdb_prepare(ds, info->port, fdb, trans); | |
98 | } | |
99 | ||
100 | ds->ops->port_fdb_add(ds, info->port, fdb, trans); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int dsa_switch_fdb_del(struct dsa_switch *ds, | |
106 | struct dsa_notifier_fdb_info *info) | |
107 | { | |
108 | const struct switchdev_obj_port_fdb *fdb = info->fdb; | |
109 | ||
110 | /* Do not care yet about other switch chips of the fabric */ | |
111 | if (ds->index != info->sw_index) | |
112 | return 0; | |
113 | ||
114 | if (!ds->ops->port_fdb_del) | |
115 | return -EOPNOTSUPP; | |
116 | ||
117 | return ds->ops->port_fdb_del(ds, info->port, fdb); | |
118 | } | |
119 | ||
8ae5bcdc VD |
120 | static int dsa_switch_mdb_add(struct dsa_switch *ds, |
121 | struct dsa_notifier_mdb_info *info) | |
122 | { | |
123 | const struct switchdev_obj_port_mdb *mdb = info->mdb; | |
124 | struct switchdev_trans *trans = info->trans; | |
a1a6b7ea VD |
125 | DECLARE_BITMAP(group, ds->num_ports); |
126 | int port, err; | |
8ae5bcdc | 127 | |
a1a6b7ea VD |
128 | /* Build a mask of Multicast group members */ |
129 | bitmap_zero(group, ds->num_ports); | |
130 | if (ds->index == info->sw_index) | |
131 | set_bit(info->port, group); | |
132 | for (port = 0; port < ds->num_ports; port++) | |
133 | if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) | |
134 | set_bit(port, group); | |
8ae5bcdc VD |
135 | |
136 | if (switchdev_trans_ph_prepare(trans)) { | |
137 | if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add) | |
138 | return -EOPNOTSUPP; | |
139 | ||
a1a6b7ea VD |
140 | for_each_set_bit(port, group, ds->num_ports) { |
141 | err = ds->ops->port_mdb_prepare(ds, port, mdb, trans); | |
142 | if (err) | |
143 | return err; | |
144 | } | |
8ae5bcdc VD |
145 | } |
146 | ||
a1a6b7ea VD |
147 | for_each_set_bit(port, group, ds->num_ports) |
148 | ds->ops->port_mdb_add(ds, port, mdb, trans); | |
8ae5bcdc VD |
149 | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static int dsa_switch_mdb_del(struct dsa_switch *ds, | |
154 | struct dsa_notifier_mdb_info *info) | |
155 | { | |
156 | const struct switchdev_obj_port_mdb *mdb = info->mdb; | |
157 | ||
8ae5bcdc VD |
158 | if (!ds->ops->port_mdb_del) |
159 | return -EOPNOTSUPP; | |
160 | ||
a1a6b7ea VD |
161 | if (ds->index == info->sw_index) |
162 | return ds->ops->port_mdb_del(ds, info->port, mdb); | |
163 | ||
164 | return 0; | |
8ae5bcdc VD |
165 | } |
166 | ||
d0c627b8 VD |
167 | static int dsa_switch_vlan_add(struct dsa_switch *ds, |
168 | struct dsa_notifier_vlan_info *info) | |
169 | { | |
170 | const struct switchdev_obj_port_vlan *vlan = info->vlan; | |
171 | struct switchdev_trans *trans = info->trans; | |
1ca4aa9c VD |
172 | DECLARE_BITMAP(members, ds->num_ports); |
173 | int port, err; | |
d0c627b8 | 174 | |
1ca4aa9c VD |
175 | /* Build a mask of VLAN members */ |
176 | bitmap_zero(members, ds->num_ports); | |
177 | if (ds->index == info->sw_index) | |
178 | set_bit(info->port, members); | |
b2f81d30 VD |
179 | for (port = 0; port < ds->num_ports; port++) |
180 | if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) | |
181 | set_bit(port, members); | |
d0c627b8 VD |
182 | |
183 | if (switchdev_trans_ph_prepare(trans)) { | |
184 | if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add) | |
185 | return -EOPNOTSUPP; | |
186 | ||
1ca4aa9c VD |
187 | for_each_set_bit(port, members, ds->num_ports) { |
188 | err = ds->ops->port_vlan_prepare(ds, port, vlan, trans); | |
189 | if (err) | |
190 | return err; | |
191 | } | |
d0c627b8 VD |
192 | } |
193 | ||
1ca4aa9c VD |
194 | for_each_set_bit(port, members, ds->num_ports) |
195 | ds->ops->port_vlan_add(ds, port, vlan, trans); | |
d0c627b8 VD |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static int dsa_switch_vlan_del(struct dsa_switch *ds, | |
201 | struct dsa_notifier_vlan_info *info) | |
202 | { | |
203 | const struct switchdev_obj_port_vlan *vlan = info->vlan; | |
204 | ||
d0c627b8 VD |
205 | if (!ds->ops->port_vlan_del) |
206 | return -EOPNOTSUPP; | |
207 | ||
1ca4aa9c VD |
208 | if (ds->index == info->sw_index) |
209 | return ds->ops->port_vlan_del(ds, info->port, vlan); | |
210 | ||
211 | return 0; | |
d0c627b8 VD |
212 | } |
213 | ||
f515f192 VD |
214 | static int dsa_switch_event(struct notifier_block *nb, |
215 | unsigned long event, void *info) | |
216 | { | |
217 | struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); | |
218 | int err; | |
219 | ||
220 | switch (event) { | |
1faabf74 VD |
221 | case DSA_NOTIFIER_AGEING_TIME: |
222 | err = dsa_switch_ageing_time(ds, info); | |
223 | break; | |
04d3a4c6 VD |
224 | case DSA_NOTIFIER_BRIDGE_JOIN: |
225 | err = dsa_switch_bridge_join(ds, info); | |
226 | break; | |
227 | case DSA_NOTIFIER_BRIDGE_LEAVE: | |
228 | err = dsa_switch_bridge_leave(ds, info); | |
229 | break; | |
685fb6a4 VD |
230 | case DSA_NOTIFIER_FDB_ADD: |
231 | err = dsa_switch_fdb_add(ds, info); | |
232 | break; | |
233 | case DSA_NOTIFIER_FDB_DEL: | |
234 | err = dsa_switch_fdb_del(ds, info); | |
235 | break; | |
8ae5bcdc VD |
236 | case DSA_NOTIFIER_MDB_ADD: |
237 | err = dsa_switch_mdb_add(ds, info); | |
238 | break; | |
239 | case DSA_NOTIFIER_MDB_DEL: | |
240 | err = dsa_switch_mdb_del(ds, info); | |
241 | break; | |
d0c627b8 VD |
242 | case DSA_NOTIFIER_VLAN_ADD: |
243 | err = dsa_switch_vlan_add(ds, info); | |
244 | break; | |
245 | case DSA_NOTIFIER_VLAN_DEL: | |
246 | err = dsa_switch_vlan_del(ds, info); | |
247 | break; | |
f515f192 VD |
248 | default: |
249 | err = -EOPNOTSUPP; | |
250 | break; | |
251 | } | |
252 | ||
253 | /* Non-switchdev operations cannot be rolled back. If a DSA driver | |
254 | * returns an error during the chained call, switch chips may be in an | |
255 | * inconsistent state. | |
256 | */ | |
257 | if (err) | |
258 | dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", | |
259 | event, err); | |
260 | ||
261 | return notifier_from_errno(err); | |
262 | } | |
263 | ||
264 | int dsa_switch_register_notifier(struct dsa_switch *ds) | |
265 | { | |
266 | ds->nb.notifier_call = dsa_switch_event; | |
267 | ||
268 | return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); | |
269 | } | |
270 | ||
271 | void dsa_switch_unregister_notifier(struct dsa_switch *ds) | |
272 | { | |
273 | int err; | |
274 | ||
275 | err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); | |
276 | if (err) | |
277 | dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); | |
278 | } |