![Vivien Didelot](/assets/img/avatar_default.png)
Do not let the drivers access the ds->ports static array directly while there is a dsa_to_port helper for this purpose. At the same time, un-const this helper since the SJA1105 driver assigns the priv member of the returned dsa_port structure. Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
362 lines
8.9 KiB
C
362 lines
8.9 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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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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bool unset_vlan_filtering = br_vlan_enabled(info->br);
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int err, i;
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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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/* 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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struct switchdev_trans trans = {0};
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err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
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false, &trans);
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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 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_prepare(struct dsa_switch *ds,
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struct dsa_notifier_mdb_info *info)
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{
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int port, err;
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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 (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_prepare(ds, port, info->mdb);
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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_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 port;
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if (switchdev_trans_ph_prepare(info->trans))
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return dsa_switch_mdb_prepare(ds, info);
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if (!ds->ops->port_mdb_add)
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return 0;
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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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ds->ops->port_mdb_add(ds, port, info->mdb);
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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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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 int dsa_port_vlan_device_check(struct net_device *vlan_dev,
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int vlan_dev_vid,
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void *arg)
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{
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struct switchdev_obj_port_vlan *vlan = arg;
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u16 vid;
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for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
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if (vid == vlan_dev_vid)
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return -EBUSY;
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}
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return 0;
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}
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static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
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const struct switchdev_obj_port_vlan *vlan)
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{
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const struct dsa_port *dp = dsa_to_port(ds, port);
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int err = 0;
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/* Device is not bridged, let it proceed with the VLAN device
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* creation.
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*/
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if (!dp->bridge_dev)
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return err;
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/* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and
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* already checks whether there is an overlapping bridge VLAN entry
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* with the same VID, so here we only need to check that if we are
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* adding a bridge VLAN entry there is not an overlapping VLAN device
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* claiming that VID.
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*/
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return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
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(void *)vlan);
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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_prepare(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_prepare || !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 = dsa_port_vlan_check(ds, port, info->vlan);
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if (err)
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return err;
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err = ds->ops->port_vlan_prepare(ds, port, info->vlan);
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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_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;
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if (switchdev_trans_ph_prepare(info->trans))
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return dsa_switch_vlan_prepare(ds, info);
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if (!ds->ops->port_vlan_add)
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return 0;
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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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ds->ops->port_vlan_add(ds, port, info->vlan);
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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 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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