![Vivien Didelot](/assets/img/avatar_default.png)
DSA currently programs a VLAN on the CPU port implicitly after the related notifier is received by a switch. While we still need to do this transparent programmation of the DSA links in the fabric, programming the CPU port this way may cause problems in some corners such as the tag_8021q driver. Because the dedicated CPU port is specific to a slave, make their programmation explicit a few layers up, in the slave code. Note that technically, DSA links have a dedicated CPU port as well, but since they are only used as conduit between interconnected switches of a fabric, programming them transparently this way is what we want. Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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 = &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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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(&ds->ports[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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