279 lines
7.2 KiB
C
279 lines
7.2 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/netdevice.h>
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#include <linux/notifier.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 = &ds->ports[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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struct switchdev_trans *trans = info->trans;
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if (switchdev_trans_ph_prepare(trans)) {
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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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return 0;
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}
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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 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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if (ds->index == info->sw_index && 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 (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
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return ds->ops->crosschip_bridge_join(ds, 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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if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
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ds->ops->port_bridge_leave(ds, info->port, info->br);
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if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
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ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
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info->br);
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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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const struct switchdev_obj_port_fdb *fdb = info->fdb;
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struct switchdev_trans *trans = info->trans;
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/* Do not care yet about other switch chips of the fabric */
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if (ds->index != info->sw_index)
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return 0;
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if (switchdev_trans_ph_prepare(trans)) {
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if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
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return -EOPNOTSUPP;
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return ds->ops->port_fdb_prepare(ds, info->port, fdb, trans);
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}
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ds->ops->port_fdb_add(ds, info->port, fdb, trans);
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return 0;
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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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const struct switchdev_obj_port_fdb *fdb = info->fdb;
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/* Do not care yet about other switch chips of the fabric */
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if (ds->index != info->sw_index)
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return 0;
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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, info->port, fdb);
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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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const struct switchdev_obj_port_mdb *mdb = info->mdb;
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struct switchdev_trans *trans = info->trans;
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DECLARE_BITMAP(group, ds->num_ports);
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int port, err;
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/* Build a mask of Multicast group members */
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bitmap_zero(group, ds->num_ports);
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if (ds->index == info->sw_index)
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set_bit(info->port, group);
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for (port = 0; port < ds->num_ports; port++)
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if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
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set_bit(port, group);
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if (switchdev_trans_ph_prepare(trans)) {
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if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
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return -EOPNOTSUPP;
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for_each_set_bit(port, group, ds->num_ports) {
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err = ds->ops->port_mdb_prepare(ds, port, mdb, trans);
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if (err)
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return err;
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}
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}
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for_each_set_bit(port, group, ds->num_ports)
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ds->ops->port_mdb_add(ds, port, mdb, trans);
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return 0;
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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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const struct switchdev_obj_port_mdb *mdb = info->mdb;
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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, mdb);
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return 0;
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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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const struct switchdev_obj_port_vlan *vlan = info->vlan;
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struct switchdev_trans *trans = info->trans;
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DECLARE_BITMAP(members, ds->num_ports);
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int port, err;
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/* Build a mask of VLAN members */
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bitmap_zero(members, ds->num_ports);
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if (ds->index == info->sw_index)
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set_bit(info->port, members);
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for (port = 0; port < ds->num_ports; port++)
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if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
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set_bit(port, members);
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if (switchdev_trans_ph_prepare(trans)) {
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if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
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return -EOPNOTSUPP;
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for_each_set_bit(port, members, ds->num_ports) {
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err = ds->ops->port_vlan_prepare(ds, port, vlan, trans);
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if (err)
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return err;
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}
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}
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for_each_set_bit(port, members, ds->num_ports)
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ds->ops->port_vlan_add(ds, port, vlan, trans);
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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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const struct switchdev_obj_port_vlan *vlan = info->vlan;
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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, vlan);
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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_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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default:
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err = -EOPNOTSUPP;
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break;
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}
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/* Non-switchdev operations cannot be rolled back. If a DSA driver
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* returns an error during the chained call, switch chips may be in an
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* inconsistent state.
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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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