1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Handling of a single switch chip, part of a switch fabric
5 * Copyright (c) 2017 Savoir-faire Linux Inc.
6 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
9 #include <linux/if_bridge.h>
10 #include <linux/netdevice.h>
11 #include <linux/notifier.h>
12 #include <linux/if_vlan.h>
13 #include <net/switchdev.h>
17 static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
18 unsigned int ageing_time)
22 for (i = 0; i < ds->num_ports; ++i) {
23 struct dsa_port *dp = &ds->ports[i];
25 if (dp->ageing_time && dp->ageing_time < ageing_time)
26 ageing_time = dp->ageing_time;
32 static int dsa_switch_ageing_time(struct dsa_switch *ds,
33 struct dsa_notifier_ageing_time_info *info)
35 unsigned int ageing_time = info->ageing_time;
36 struct switchdev_trans *trans = info->trans;
38 if (switchdev_trans_ph_prepare(trans)) {
39 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
41 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
46 /* Program the fastest ageing time in case of multiple bridges */
47 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
49 if (ds->ops->set_ageing_time)
50 return ds->ops->set_ageing_time(ds, ageing_time);
55 static int dsa_switch_bridge_join(struct dsa_switch *ds,
56 struct dsa_notifier_bridge_info *info)
58 if (ds->index == info->sw_index && ds->ops->port_bridge_join)
59 return ds->ops->port_bridge_join(ds, info->port, info->br);
61 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
62 return ds->ops->crosschip_bridge_join(ds, info->sw_index,
63 info->port, info->br);
68 static int dsa_switch_bridge_leave(struct dsa_switch *ds,
69 struct dsa_notifier_bridge_info *info)
71 bool unset_vlan_filtering = br_vlan_enabled(info->br);
74 if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
75 ds->ops->port_bridge_leave(ds, info->port, info->br);
77 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
78 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
81 /* If the bridge was vlan_filtering, the bridge core doesn't trigger an
82 * event for changing vlan_filtering setting upon slave ports leaving
83 * it. That is a good thing, because that lets us handle it and also
84 * handle the case where the switch's vlan_filtering setting is global
85 * (not per port). When that happens, the correct moment to trigger the
86 * vlan_filtering callback is only when the last port left this bridge.
88 if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
89 for (i = 0; i < ds->num_ports; i++) {
92 if (dsa_to_port(ds, i)->bridge_dev == info->br) {
93 unset_vlan_filtering = false;
98 if (unset_vlan_filtering) {
99 struct switchdev_trans trans = {0};
101 err = dsa_port_vlan_filtering(&ds->ports[info->port],
103 if (err && err != EOPNOTSUPP)
109 static int dsa_switch_fdb_add(struct dsa_switch *ds,
110 struct dsa_notifier_fdb_info *info)
112 int port = dsa_towards_port(ds, info->sw_index, info->port);
114 if (!ds->ops->port_fdb_add)
117 return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
120 static int dsa_switch_fdb_del(struct dsa_switch *ds,
121 struct dsa_notifier_fdb_info *info)
123 int port = dsa_towards_port(ds, info->sw_index, info->port);
125 if (!ds->ops->port_fdb_del)
128 return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
132 dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
133 const struct switchdev_obj_port_mdb *mdb,
134 const unsigned long *bitmap)
138 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
141 for_each_set_bit(port, bitmap, ds->num_ports) {
142 err = ds->ops->port_mdb_prepare(ds, port, mdb);
150 static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
151 const struct switchdev_obj_port_mdb *mdb,
152 const unsigned long *bitmap)
156 if (!ds->ops->port_mdb_add)
159 for_each_set_bit(port, bitmap, ds->num_ports)
160 ds->ops->port_mdb_add(ds, port, mdb);
163 static int dsa_switch_mdb_add(struct dsa_switch *ds,
164 struct dsa_notifier_mdb_info *info)
166 const struct switchdev_obj_port_mdb *mdb = info->mdb;
167 struct switchdev_trans *trans = info->trans;
170 /* Build a mask of Multicast group members */
171 bitmap_zero(ds->bitmap, ds->num_ports);
172 if (ds->index == info->sw_index)
173 set_bit(info->port, ds->bitmap);
174 for (port = 0; port < ds->num_ports; port++)
175 if (dsa_is_dsa_port(ds, port))
176 set_bit(port, ds->bitmap);
178 if (switchdev_trans_ph_prepare(trans))
179 return dsa_switch_mdb_prepare_bitmap(ds, mdb, ds->bitmap);
181 dsa_switch_mdb_add_bitmap(ds, mdb, ds->bitmap);
186 static int dsa_switch_mdb_del(struct dsa_switch *ds,
187 struct dsa_notifier_mdb_info *info)
189 const struct switchdev_obj_port_mdb *mdb = info->mdb;
191 if (!ds->ops->port_mdb_del)
194 if (ds->index == info->sw_index)
195 return ds->ops->port_mdb_del(ds, info->port, mdb);
200 static int dsa_port_vlan_device_check(struct net_device *vlan_dev,
204 struct switchdev_obj_port_vlan *vlan = arg;
207 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
208 if (vid == vlan_dev_vid)
215 static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
216 const struct switchdev_obj_port_vlan *vlan)
218 const struct dsa_port *dp = dsa_to_port(ds, port);
221 /* Device is not bridged, let it proceed with the VLAN device
227 /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and
228 * already checks whether there is an overlapping bridge VLAN entry
229 * with the same VID, so here we only need to check that if we are
230 * adding a bridge VLAN entry there is not an overlapping VLAN device
233 return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
238 dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
239 const struct switchdev_obj_port_vlan *vlan,
240 const unsigned long *bitmap)
244 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
247 for_each_set_bit(port, bitmap, ds->num_ports) {
248 err = dsa_port_vlan_check(ds, port, vlan);
252 err = ds->ops->port_vlan_prepare(ds, port, vlan);
261 dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
262 const struct switchdev_obj_port_vlan *vlan,
263 const unsigned long *bitmap)
267 for_each_set_bit(port, bitmap, ds->num_ports)
268 ds->ops->port_vlan_add(ds, port, vlan);
271 static int dsa_switch_vlan_add(struct dsa_switch *ds,
272 struct dsa_notifier_vlan_info *info)
274 const struct switchdev_obj_port_vlan *vlan = info->vlan;
275 struct switchdev_trans *trans = info->trans;
278 /* Build a mask of VLAN members */
279 bitmap_zero(ds->bitmap, ds->num_ports);
280 if (ds->index == info->sw_index)
281 set_bit(info->port, ds->bitmap);
282 for (port = 0; port < ds->num_ports; port++)
283 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
284 set_bit(port, ds->bitmap);
286 if (switchdev_trans_ph_prepare(trans))
287 return dsa_switch_vlan_prepare_bitmap(ds, vlan, ds->bitmap);
289 dsa_switch_vlan_add_bitmap(ds, vlan, ds->bitmap);
294 static int dsa_switch_vlan_del(struct dsa_switch *ds,
295 struct dsa_notifier_vlan_info *info)
297 const struct switchdev_obj_port_vlan *vlan = info->vlan;
299 if (!ds->ops->port_vlan_del)
302 if (ds->index == info->sw_index)
303 return ds->ops->port_vlan_del(ds, info->port, vlan);
308 static int dsa_switch_event(struct notifier_block *nb,
309 unsigned long event, void *info)
311 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
315 case DSA_NOTIFIER_AGEING_TIME:
316 err = dsa_switch_ageing_time(ds, info);
318 case DSA_NOTIFIER_BRIDGE_JOIN:
319 err = dsa_switch_bridge_join(ds, info);
321 case DSA_NOTIFIER_BRIDGE_LEAVE:
322 err = dsa_switch_bridge_leave(ds, info);
324 case DSA_NOTIFIER_FDB_ADD:
325 err = dsa_switch_fdb_add(ds, info);
327 case DSA_NOTIFIER_FDB_DEL:
328 err = dsa_switch_fdb_del(ds, info);
330 case DSA_NOTIFIER_MDB_ADD:
331 err = dsa_switch_mdb_add(ds, info);
333 case DSA_NOTIFIER_MDB_DEL:
334 err = dsa_switch_mdb_del(ds, info);
336 case DSA_NOTIFIER_VLAN_ADD:
337 err = dsa_switch_vlan_add(ds, info);
339 case DSA_NOTIFIER_VLAN_DEL:
340 err = dsa_switch_vlan_del(ds, info);
347 /* Non-switchdev operations cannot be rolled back. If a DSA driver
348 * returns an error during the chained call, switch chips may be in an
349 * inconsistent state.
352 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
355 return notifier_from_errno(err);
358 int dsa_switch_register_notifier(struct dsa_switch *ds)
360 ds->nb.notifier_call = dsa_switch_event;
362 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
365 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
369 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
371 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);