// SPDX-License-Identifier: GPL-2.0-or-later /* * Handling of a single switch chip, part of a switch fabric * * Copyright (c) 2017 Savoir-faire Linux Inc. * Vivien Didelot <vivien.didelot@savoirfairelinux.com> */ #include <linux/if_bridge.h> #include <linux/netdevice.h> #include <linux/notifier.h> #include <linux/if_vlan.h> #include <net/switchdev.h> #include "dsa_priv.h" static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds, unsigned int ageing_time) { int i; for (i = 0; i < ds->num_ports; ++i) { struct dsa_port *dp = dsa_to_port(ds, i); if (dp->ageing_time && dp->ageing_time < ageing_time) ageing_time = dp->ageing_time; } return ageing_time; } static int dsa_switch_ageing_time(struct dsa_switch *ds, struct dsa_notifier_ageing_time_info *info) { unsigned int ageing_time = info->ageing_time; struct switchdev_trans *trans = info->trans; if (switchdev_trans_ph_prepare(trans)) { if (ds->ageing_time_min && ageing_time < ds->ageing_time_min) return -ERANGE; if (ds->ageing_time_max && ageing_time > ds->ageing_time_max) return -ERANGE; return 0; } /* Program the fastest ageing time in case of multiple bridges */ ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time); if (ds->ops->set_ageing_time) return ds->ops->set_ageing_time(ds, ageing_time); return 0; } static int dsa_switch_bridge_join(struct dsa_switch *ds, struct dsa_notifier_bridge_info *info) { if (ds->index == info->sw_index && ds->ops->port_bridge_join) return ds->ops->port_bridge_join(ds, info->port, info->br); if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join) return ds->ops->crosschip_bridge_join(ds, info->sw_index, info->port, info->br); return 0; } static int dsa_switch_bridge_leave(struct dsa_switch *ds, struct dsa_notifier_bridge_info *info) { bool unset_vlan_filtering = br_vlan_enabled(info->br); int err, i; if (ds->index == info->sw_index && ds->ops->port_bridge_leave) ds->ops->port_bridge_leave(ds, info->port, info->br); if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave) ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port, info->br); /* If the bridge was vlan_filtering, the bridge core doesn't trigger an * event for changing vlan_filtering setting upon slave ports leaving * it. That is a good thing, because that lets us handle it and also * handle the case where the switch's vlan_filtering setting is global * (not per port). When that happens, the correct moment to trigger the * vlan_filtering callback is only when the last port left this bridge. */ if (unset_vlan_filtering && ds->vlan_filtering_is_global) { for (i = 0; i < ds->num_ports; i++) { if (i == info->port) continue; if (dsa_to_port(ds, i)->bridge_dev == info->br) { unset_vlan_filtering = false; break; } } } if (unset_vlan_filtering) { struct switchdev_trans trans = {0}; err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port), false, &trans); if (err && err != EOPNOTSUPP) return err; } return 0; } static int dsa_switch_fdb_add(struct dsa_switch *ds, struct dsa_notifier_fdb_info *info) { int port = dsa_towards_port(ds, info->sw_index, info->port); if (!ds->ops->port_fdb_add) return -EOPNOTSUPP; return ds->ops->port_fdb_add(ds, port, info->addr, info->vid); } static int dsa_switch_fdb_del(struct dsa_switch *ds, struct dsa_notifier_fdb_info *info) { int port = dsa_towards_port(ds, info->sw_index, info->port); if (!ds->ops->port_fdb_del) return -EOPNOTSUPP; return ds->ops->port_fdb_del(ds, port, info->addr, info->vid); } static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port, struct dsa_notifier_mdb_info *info) { if (ds->index == info->sw_index && port == info->port) return true; if (dsa_is_dsa_port(ds, port)) return true; return false; } static int dsa_switch_mdb_prepare(struct dsa_switch *ds, struct dsa_notifier_mdb_info *info) { int port, err; if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add) return -EOPNOTSUPP; for (port = 0; port < ds->num_ports; port++) { if (dsa_switch_mdb_match(ds, port, info)) { err = ds->ops->port_mdb_prepare(ds, port, info->mdb); if (err) return err; } } return 0; } static int dsa_switch_mdb_add(struct dsa_switch *ds, struct dsa_notifier_mdb_info *info) { int port; if (switchdev_trans_ph_prepare(info->trans)) return dsa_switch_mdb_prepare(ds, info); if (!ds->ops->port_mdb_add) return 0; for (port = 0; port < ds->num_ports; port++) if (dsa_switch_mdb_match(ds, port, info)) ds->ops->port_mdb_add(ds, port, info->mdb); return 0; } static int dsa_switch_mdb_del(struct dsa_switch *ds, struct dsa_notifier_mdb_info *info) { if (!ds->ops->port_mdb_del) return -EOPNOTSUPP; if (ds->index == info->sw_index) return ds->ops->port_mdb_del(ds, info->port, info->mdb); return 0; } static int dsa_port_vlan_device_check(struct net_device *vlan_dev, int vlan_dev_vid, void *arg) { struct switchdev_obj_port_vlan *vlan = arg; u16 vid; for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { if (vid == vlan_dev_vid) return -EBUSY; } return 0; } static int dsa_port_vlan_check(struct dsa_switch *ds, int port, const struct switchdev_obj_port_vlan *vlan) { const struct dsa_port *dp = dsa_to_port(ds, port); int err = 0; /* Device is not bridged, let it proceed with the VLAN device * creation. */ if (!dp->bridge_dev) return err; /* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and * already checks whether there is an overlapping bridge VLAN entry * with the same VID, so here we only need to check that if we are * adding a bridge VLAN entry there is not an overlapping VLAN device * claiming that VID. */ return vlan_for_each(dp->slave, dsa_port_vlan_device_check, (void *)vlan); } static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port, struct dsa_notifier_vlan_info *info) { if (ds->index == info->sw_index && port == info->port) return true; if (dsa_is_dsa_port(ds, port)) return true; return false; } static int dsa_switch_vlan_prepare(struct dsa_switch *ds, struct dsa_notifier_vlan_info *info) { int port, err; if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add) return -EOPNOTSUPP; for (port = 0; port < ds->num_ports; port++) { if (dsa_switch_vlan_match(ds, port, info)) { err = dsa_port_vlan_check(ds, port, info->vlan); if (err) return err; err = ds->ops->port_vlan_prepare(ds, port, info->vlan); if (err) return err; } } return 0; } static int dsa_switch_vlan_add(struct dsa_switch *ds, struct dsa_notifier_vlan_info *info) { int port; if (switchdev_trans_ph_prepare(info->trans)) return dsa_switch_vlan_prepare(ds, info); if (!ds->ops->port_vlan_add) return 0; for (port = 0; port < ds->num_ports; port++) if (dsa_switch_vlan_match(ds, port, info)) ds->ops->port_vlan_add(ds, port, info->vlan); return 0; } static int dsa_switch_vlan_del(struct dsa_switch *ds, struct dsa_notifier_vlan_info *info) { if (!ds->ops->port_vlan_del) return -EOPNOTSUPP; if (ds->index == info->sw_index) return ds->ops->port_vlan_del(ds, info->port, info->vlan); /* Do not deprogram the DSA links as they may be used as conduit * for other VLAN members in the fabric. */ return 0; } static int dsa_switch_event(struct notifier_block *nb, unsigned long event, void *info) { struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); int err; switch (event) { case DSA_NOTIFIER_AGEING_TIME: err = dsa_switch_ageing_time(ds, info); break; case DSA_NOTIFIER_BRIDGE_JOIN: err = dsa_switch_bridge_join(ds, info); break; case DSA_NOTIFIER_BRIDGE_LEAVE: err = dsa_switch_bridge_leave(ds, info); break; case DSA_NOTIFIER_FDB_ADD: err = dsa_switch_fdb_add(ds, info); break; case DSA_NOTIFIER_FDB_DEL: err = dsa_switch_fdb_del(ds, info); break; case DSA_NOTIFIER_MDB_ADD: err = dsa_switch_mdb_add(ds, info); break; case DSA_NOTIFIER_MDB_DEL: err = dsa_switch_mdb_del(ds, info); break; case DSA_NOTIFIER_VLAN_ADD: err = dsa_switch_vlan_add(ds, info); break; case DSA_NOTIFIER_VLAN_DEL: err = dsa_switch_vlan_del(ds, info); break; default: err = -EOPNOTSUPP; break; } /* Non-switchdev operations cannot be rolled back. If a DSA driver * returns an error during the chained call, switch chips may be in an * inconsistent state. */ if (err) dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", event, err); return notifier_from_errno(err); } int dsa_switch_register_notifier(struct dsa_switch *ds) { ds->nb.notifier_call = dsa_switch_event; return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); } void dsa_switch_unregister_notifier(struct dsa_switch *ds) { int err; err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); if (err) dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); }