457 lines
11 KiB
C
457 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Handling of a single switch chip, part of a switch fabric
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*
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* Copyright (c) 2017 Savoir-faire Linux Inc.
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* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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*/
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#include <linux/if_bridge.h>
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#include <linux/netdevice.h>
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#include <linux/notifier.h>
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#include <linux/if_vlan.h>
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#include <net/switchdev.h>
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#include "dsa_priv.h"
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static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
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unsigned int ageing_time)
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{
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int i;
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for (i = 0; i < ds->num_ports; ++i) {
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struct dsa_port *dp = dsa_to_port(ds, i);
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if (dp->ageing_time && dp->ageing_time < ageing_time)
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ageing_time = dp->ageing_time;
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}
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return ageing_time;
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}
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static int dsa_switch_ageing_time(struct dsa_switch *ds,
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struct dsa_notifier_ageing_time_info *info)
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{
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unsigned int ageing_time = info->ageing_time;
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if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
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return -ERANGE;
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if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
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return -ERANGE;
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/* Program the fastest ageing time in case of multiple bridges */
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ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
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if (ds->ops->set_ageing_time)
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return ds->ops->set_ageing_time(ds, ageing_time);
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return 0;
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}
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static bool dsa_switch_mtu_match(struct dsa_switch *ds, int port,
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struct dsa_notifier_mtu_info *info)
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{
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if (ds->index == info->sw_index)
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return (port == info->port) || dsa_is_dsa_port(ds, port);
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if (!info->propagate_upstream)
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return false;
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if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
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return true;
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return false;
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}
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static int dsa_switch_mtu(struct dsa_switch *ds,
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struct dsa_notifier_mtu_info *info)
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{
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int port, ret;
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if (!ds->ops->port_change_mtu)
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return -EOPNOTSUPP;
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for (port = 0; port < ds->num_ports; port++) {
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if (dsa_switch_mtu_match(ds, port, info)) {
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ret = ds->ops->port_change_mtu(ds, port, info->mtu);
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if (ret)
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return ret;
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}
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}
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return 0;
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}
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static int dsa_switch_bridge_join(struct dsa_switch *ds,
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struct dsa_notifier_bridge_info *info)
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{
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struct dsa_switch_tree *dst = ds->dst;
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if (dst->index == info->tree_index && ds->index == info->sw_index &&
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ds->ops->port_bridge_join)
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return ds->ops->port_bridge_join(ds, info->port, info->br);
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if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
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ds->ops->crosschip_bridge_join)
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return ds->ops->crosschip_bridge_join(ds, info->tree_index,
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info->sw_index,
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info->port, info->br);
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return 0;
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}
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static int dsa_switch_bridge_leave(struct dsa_switch *ds,
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struct dsa_notifier_bridge_info *info)
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{
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bool unset_vlan_filtering = br_vlan_enabled(info->br);
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struct dsa_switch_tree *dst = ds->dst;
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struct netlink_ext_ack extack = {0};
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int err, i;
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if (dst->index == info->tree_index && ds->index == info->sw_index &&
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ds->ops->port_bridge_join)
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ds->ops->port_bridge_leave(ds, info->port, info->br);
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if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
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ds->ops->crosschip_bridge_join)
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ds->ops->crosschip_bridge_leave(ds, info->tree_index,
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info->sw_index, info->port,
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info->br);
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/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
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* event for changing vlan_filtering setting upon slave ports leaving
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* it. That is a good thing, because that lets us handle it and also
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* handle the case where the switch's vlan_filtering setting is global
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* (not per port). When that happens, the correct moment to trigger the
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* vlan_filtering callback is only when the last port left this bridge.
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*/
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if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
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for (i = 0; i < ds->num_ports; i++) {
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if (i == info->port)
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continue;
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if (dsa_to_port(ds, i)->bridge_dev == info->br) {
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unset_vlan_filtering = false;
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break;
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}
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}
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}
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if (unset_vlan_filtering) {
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err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
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false, &extack);
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if (extack._msg)
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dev_err(ds->dev, "port %d: %s\n", info->port,
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extack._msg);
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if (err && err != EOPNOTSUPP)
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return err;
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}
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return 0;
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}
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static int dsa_switch_fdb_add(struct dsa_switch *ds,
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struct dsa_notifier_fdb_info *info)
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{
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int port = dsa_towards_port(ds, info->sw_index, info->port);
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if (!ds->ops->port_fdb_add)
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return -EOPNOTSUPP;
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return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
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}
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static int dsa_switch_fdb_del(struct dsa_switch *ds,
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struct dsa_notifier_fdb_info *info)
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{
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int port = dsa_towards_port(ds, info->sw_index, info->port);
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if (!ds->ops->port_fdb_del)
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return -EOPNOTSUPP;
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return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
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}
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static int dsa_switch_hsr_join(struct dsa_switch *ds,
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struct dsa_notifier_hsr_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_hsr_join)
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return ds->ops->port_hsr_join(ds, info->port, info->hsr);
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return -EOPNOTSUPP;
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}
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static int dsa_switch_hsr_leave(struct dsa_switch *ds,
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struct dsa_notifier_hsr_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_hsr_leave)
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return ds->ops->port_hsr_leave(ds, info->port, info->hsr);
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return -EOPNOTSUPP;
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}
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static int dsa_switch_lag_change(struct dsa_switch *ds,
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struct dsa_notifier_lag_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_lag_change)
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return ds->ops->port_lag_change(ds, info->port);
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if (ds->index != info->sw_index && ds->ops->crosschip_lag_change)
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return ds->ops->crosschip_lag_change(ds, info->sw_index,
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info->port);
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return 0;
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}
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static int dsa_switch_lag_join(struct dsa_switch *ds,
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struct dsa_notifier_lag_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_lag_join)
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return ds->ops->port_lag_join(ds, info->port, info->lag,
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info->info);
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if (ds->index != info->sw_index && ds->ops->crosschip_lag_join)
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return ds->ops->crosschip_lag_join(ds, info->sw_index,
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info->port, info->lag,
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info->info);
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return 0;
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}
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static int dsa_switch_lag_leave(struct dsa_switch *ds,
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struct dsa_notifier_lag_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_lag_leave)
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return ds->ops->port_lag_leave(ds, info->port, info->lag);
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if (ds->index != info->sw_index && ds->ops->crosschip_lag_leave)
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return ds->ops->crosschip_lag_leave(ds, info->sw_index,
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info->port, info->lag);
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return 0;
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}
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static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
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struct dsa_notifier_mdb_info *info)
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{
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if (ds->index == info->sw_index && port == info->port)
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return true;
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if (dsa_is_dsa_port(ds, port))
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return true;
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return false;
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}
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static int dsa_switch_mdb_add(struct dsa_switch *ds,
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struct dsa_notifier_mdb_info *info)
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{
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int err = 0;
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int port;
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if (!ds->ops->port_mdb_add)
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return -EOPNOTSUPP;
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for (port = 0; port < ds->num_ports; port++) {
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if (dsa_switch_mdb_match(ds, port, info)) {
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err = ds->ops->port_mdb_add(ds, port, info->mdb);
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if (err)
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break;
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}
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}
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return err;
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}
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static int dsa_switch_mdb_del(struct dsa_switch *ds,
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struct dsa_notifier_mdb_info *info)
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{
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if (!ds->ops->port_mdb_del)
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return -EOPNOTSUPP;
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if (ds->index == info->sw_index)
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return ds->ops->port_mdb_del(ds, info->port, info->mdb);
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return 0;
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}
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static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
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struct dsa_notifier_vlan_info *info)
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{
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if (ds->index == info->sw_index && port == info->port)
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return true;
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if (dsa_is_dsa_port(ds, port))
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return true;
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return false;
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}
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static int dsa_switch_vlan_add(struct dsa_switch *ds,
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struct dsa_notifier_vlan_info *info)
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{
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int port, err;
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if (!ds->ops->port_vlan_add)
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return -EOPNOTSUPP;
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for (port = 0; port < ds->num_ports; port++) {
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if (dsa_switch_vlan_match(ds, port, info)) {
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err = ds->ops->port_vlan_add(ds, port, info->vlan,
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info->extack);
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if (err)
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return err;
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}
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}
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return 0;
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}
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static int dsa_switch_vlan_del(struct dsa_switch *ds,
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struct dsa_notifier_vlan_info *info)
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{
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if (!ds->ops->port_vlan_del)
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return -EOPNOTSUPP;
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if (ds->index == info->sw_index)
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return ds->ops->port_vlan_del(ds, info->port, info->vlan);
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/* Do not deprogram the DSA links as they may be used as conduit
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* for other VLAN members in the fabric.
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*/
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return 0;
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}
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static bool dsa_switch_tag_proto_match(struct dsa_switch *ds, int port,
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struct dsa_notifier_tag_proto_info *info)
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{
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if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
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return true;
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return false;
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}
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static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
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struct dsa_notifier_tag_proto_info *info)
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{
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const struct dsa_device_ops *tag_ops = info->tag_ops;
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int port, err;
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if (!ds->ops->change_tag_protocol)
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return -EOPNOTSUPP;
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ASSERT_RTNL();
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for (port = 0; port < ds->num_ports; port++) {
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if (dsa_switch_tag_proto_match(ds, port, info)) {
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err = ds->ops->change_tag_protocol(ds, port,
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tag_ops->proto);
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if (err)
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return err;
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if (dsa_is_cpu_port(ds, port))
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dsa_port_set_tag_protocol(dsa_to_port(ds, port),
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tag_ops);
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}
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}
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/* Now that changing the tag protocol can no longer fail, let's update
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* the remaining bits which are "duplicated for faster access", and the
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* bits that depend on the tagger, such as the MTU.
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*/
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for (port = 0; port < ds->num_ports; port++) {
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if (dsa_is_user_port(ds, port)) {
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struct net_device *slave;
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slave = dsa_to_port(ds, port)->slave;
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dsa_slave_setup_tagger(slave);
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/* rtnl_mutex is held in dsa_tree_change_tag_proto */
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dsa_slave_change_mtu(slave, slave->mtu);
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}
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}
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return 0;
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}
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static int dsa_switch_event(struct notifier_block *nb,
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unsigned long event, void *info)
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{
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struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
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int err;
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switch (event) {
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case DSA_NOTIFIER_AGEING_TIME:
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err = dsa_switch_ageing_time(ds, info);
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break;
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case DSA_NOTIFIER_BRIDGE_JOIN:
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err = dsa_switch_bridge_join(ds, info);
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break;
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case DSA_NOTIFIER_BRIDGE_LEAVE:
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err = dsa_switch_bridge_leave(ds, info);
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break;
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case DSA_NOTIFIER_FDB_ADD:
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err = dsa_switch_fdb_add(ds, info);
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break;
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case DSA_NOTIFIER_FDB_DEL:
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err = dsa_switch_fdb_del(ds, info);
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break;
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case DSA_NOTIFIER_HSR_JOIN:
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err = dsa_switch_hsr_join(ds, info);
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break;
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case DSA_NOTIFIER_HSR_LEAVE:
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err = dsa_switch_hsr_leave(ds, info);
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break;
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case DSA_NOTIFIER_LAG_CHANGE:
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err = dsa_switch_lag_change(ds, info);
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break;
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case DSA_NOTIFIER_LAG_JOIN:
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err = dsa_switch_lag_join(ds, info);
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break;
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case DSA_NOTIFIER_LAG_LEAVE:
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err = dsa_switch_lag_leave(ds, info);
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break;
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case DSA_NOTIFIER_MDB_ADD:
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err = dsa_switch_mdb_add(ds, info);
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break;
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case DSA_NOTIFIER_MDB_DEL:
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err = dsa_switch_mdb_del(ds, info);
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break;
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case DSA_NOTIFIER_VLAN_ADD:
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err = dsa_switch_vlan_add(ds, info);
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break;
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case DSA_NOTIFIER_VLAN_DEL:
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err = dsa_switch_vlan_del(ds, info);
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break;
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case DSA_NOTIFIER_MTU:
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err = dsa_switch_mtu(ds, info);
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break;
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case DSA_NOTIFIER_TAG_PROTO:
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err = dsa_switch_change_tag_proto(ds, info);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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if (err)
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dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
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event, err);
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return notifier_from_errno(err);
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}
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int dsa_switch_register_notifier(struct dsa_switch *ds)
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{
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ds->nb.notifier_call = dsa_switch_event;
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return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
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}
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void dsa_switch_unregister_notifier(struct dsa_switch *ds)
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{
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int err;
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err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
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if (err)
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dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
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}
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