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switch.c
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switch.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Handling of a single switch chip, part of a switch fabric
*
* Copyright (c) 2017 Savoir-faire Linux Inc.
* Vivien Didelot <[email protected]>
*/
#include <linux/if_bridge.h>
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/if_vlan.h>
#include <net/switchdev.h>
#include "dsa_priv.h"
static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
unsigned int ageing_time)
{
struct dsa_port *dp;
dsa_switch_for_each_port(dp, ds)
if (dp->ageing_time && dp->ageing_time < ageing_time)
ageing_time = dp->ageing_time;
return ageing_time;
}
static int dsa_switch_ageing_time(struct dsa_switch *ds,
struct dsa_notifier_ageing_time_info *info)
{
unsigned int ageing_time = info->ageing_time;
if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
return -ERANGE;
if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
return -ERANGE;
/* Program the fastest ageing time in case of multiple bridges */
ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
if (ds->ops->set_ageing_time)
return ds->ops->set_ageing_time(ds, ageing_time);
return 0;
}
static bool dsa_port_mtu_match(struct dsa_port *dp,
struct dsa_notifier_mtu_info *info)
{
if (dp->ds->index == info->sw_index && dp->index == info->port)
return true;
/* Do not propagate to other switches in the tree if the notifier was
* targeted for a single switch.
*/
if (info->targeted_match)
return false;
if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp))
return true;
return false;
}
static int dsa_switch_mtu(struct dsa_switch *ds,
struct dsa_notifier_mtu_info *info)
{
struct dsa_port *dp;
int ret;
if (!ds->ops->port_change_mtu)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_mtu_match(dp, info)) {
ret = ds->ops->port_change_mtu(ds, dp->index,
info->mtu);
if (ret)
return ret;
}
}
return 0;
}
static int dsa_switch_bridge_join(struct dsa_switch *ds,
struct dsa_notifier_bridge_info *info)
{
struct dsa_switch_tree *dst = ds->dst;
int err;
if (dst->index == info->tree_index && ds->index == info->sw_index) {
if (!ds->ops->port_bridge_join)
return -EOPNOTSUPP;
err = ds->ops->port_bridge_join(ds, info->port, info->bridge,
&info->tx_fwd_offload,
info->extack);
if (err)
return err;
}
if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
ds->ops->crosschip_bridge_join) {
err = ds->ops->crosschip_bridge_join(ds, info->tree_index,
info->sw_index,
info->port, info->bridge,
info->extack);
if (err)
return err;
}
return 0;
}
static int dsa_switch_sync_vlan_filtering(struct dsa_switch *ds,
struct dsa_notifier_bridge_info *info)
{
struct netlink_ext_ack extack = {0};
bool change_vlan_filtering = false;
bool vlan_filtering;
struct dsa_port *dp;
int err;
if (ds->needs_standalone_vlan_filtering &&
!br_vlan_enabled(info->bridge.dev)) {
change_vlan_filtering = true;
vlan_filtering = true;
} else if (!ds->needs_standalone_vlan_filtering &&
br_vlan_enabled(info->bridge.dev)) {
change_vlan_filtering = true;
vlan_filtering = false;
}
/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
* event for changing vlan_filtering setting upon slave ports leaving
* it. That is a good thing, because that lets us handle it and also
* handle the case where the switch's vlan_filtering setting is global
* (not per port). When that happens, the correct moment to trigger the
* vlan_filtering callback is only when the last port leaves the last
* VLAN-aware bridge.
*/
if (change_vlan_filtering && ds->vlan_filtering_is_global) {
dsa_switch_for_each_port(dp, ds) {
struct net_device *br = dsa_port_bridge_dev_get(dp);
if (br && br_vlan_enabled(br)) {
change_vlan_filtering = false;
break;
}
}
}
if (change_vlan_filtering) {
err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
vlan_filtering, &extack);
if (extack._msg)
dev_err(ds->dev, "port %d: %s\n", info->port,
extack._msg);
if (err && err != -EOPNOTSUPP)
return err;
}
return 0;
}
static int dsa_switch_bridge_leave(struct dsa_switch *ds,
struct dsa_notifier_bridge_info *info)
{
struct dsa_switch_tree *dst = ds->dst;
int err;
if (dst->index == info->tree_index && ds->index == info->sw_index &&
ds->ops->port_bridge_leave)
ds->ops->port_bridge_leave(ds, info->port, info->bridge);
if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
ds->ops->crosschip_bridge_leave)
ds->ops->crosschip_bridge_leave(ds, info->tree_index,
info->sw_index, info->port,
info->bridge);
if (ds->dst->index == info->tree_index && ds->index == info->sw_index) {
err = dsa_switch_sync_vlan_filtering(ds, info);
if (err)
return err;
}
return 0;
}
/* Matches for all upstream-facing ports (the CPU port and all upstream-facing
* DSA links) that sit between the targeted port on which the notifier was
* emitted and its dedicated CPU port.
*/
static bool dsa_port_host_address_match(struct dsa_port *dp,
int info_sw_index, int info_port)
{
struct dsa_port *targeted_dp, *cpu_dp;
struct dsa_switch *targeted_ds;
targeted_ds = dsa_switch_find(dp->ds->dst->index, info_sw_index);
targeted_dp = dsa_to_port(targeted_ds, info_port);
cpu_dp = targeted_dp->cpu_dp;
if (dsa_switch_is_upstream_of(dp->ds, targeted_ds))
return dp->index == dsa_towards_port(dp->ds, cpu_dp->ds->index,
cpu_dp->index);
return false;
}
static struct dsa_mac_addr *dsa_mac_addr_find(struct list_head *addr_list,
const unsigned char *addr, u16 vid,
struct dsa_db db)
{
struct dsa_mac_addr *a;
list_for_each_entry(a, addr_list, list)
if (ether_addr_equal(a->addr, addr) && a->vid == vid &&
dsa_db_equal(&a->db, &db))
return a;
return NULL;
}
static int dsa_port_do_mdb_add(struct dsa_port *dp,
const struct switchdev_obj_port_mdb *mdb,
struct dsa_db db)
{
struct dsa_switch *ds = dp->ds;
struct dsa_mac_addr *a;
int port = dp->index;
int err = 0;
/* No need to bother with refcounting for user ports */
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
return ds->ops->port_mdb_add(ds, port, mdb, db);
mutex_lock(&dp->addr_lists_lock);
a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid, db);
if (a) {
refcount_inc(&a->refcount);
goto out;
}
a = kzalloc(sizeof(*a), GFP_KERNEL);
if (!a) {
err = -ENOMEM;
goto out;
}
err = ds->ops->port_mdb_add(ds, port, mdb, db);
if (err) {
kfree(a);
goto out;
}
ether_addr_copy(a->addr, mdb->addr);
a->vid = mdb->vid;
a->db = db;
refcount_set(&a->refcount, 1);
list_add_tail(&a->list, &dp->mdbs);
out:
mutex_unlock(&dp->addr_lists_lock);
return err;
}
static int dsa_port_do_mdb_del(struct dsa_port *dp,
const struct switchdev_obj_port_mdb *mdb,
struct dsa_db db)
{
struct dsa_switch *ds = dp->ds;
struct dsa_mac_addr *a;
int port = dp->index;
int err = 0;
/* No need to bother with refcounting for user ports */
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
return ds->ops->port_mdb_del(ds, port, mdb, db);
mutex_lock(&dp->addr_lists_lock);
a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid, db);
if (!a) {
err = -ENOENT;
goto out;
}
if (!refcount_dec_and_test(&a->refcount))
goto out;
err = ds->ops->port_mdb_del(ds, port, mdb, db);
if (err) {
refcount_set(&a->refcount, 1);
goto out;
}
list_del(&a->list);
kfree(a);
out:
mutex_unlock(&dp->addr_lists_lock);
return err;
}
static int dsa_port_do_fdb_add(struct dsa_port *dp, const unsigned char *addr,
u16 vid, struct dsa_db db)
{
struct dsa_switch *ds = dp->ds;
struct dsa_mac_addr *a;
int port = dp->index;
int err = 0;
/* No need to bother with refcounting for user ports */
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
return ds->ops->port_fdb_add(ds, port, addr, vid, db);
mutex_lock(&dp->addr_lists_lock);
a = dsa_mac_addr_find(&dp->fdbs, addr, vid, db);
if (a) {
refcount_inc(&a->refcount);
goto out;
}
a = kzalloc(sizeof(*a), GFP_KERNEL);
if (!a) {
err = -ENOMEM;
goto out;
}
err = ds->ops->port_fdb_add(ds, port, addr, vid, db);
if (err) {
kfree(a);
goto out;
}
ether_addr_copy(a->addr, addr);
a->vid = vid;
a->db = db;
refcount_set(&a->refcount, 1);
list_add_tail(&a->list, &dp->fdbs);
out:
mutex_unlock(&dp->addr_lists_lock);
return err;
}
static int dsa_port_do_fdb_del(struct dsa_port *dp, const unsigned char *addr,
u16 vid, struct dsa_db db)
{
struct dsa_switch *ds = dp->ds;
struct dsa_mac_addr *a;
int port = dp->index;
int err = 0;
/* No need to bother with refcounting for user ports */
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
return ds->ops->port_fdb_del(ds, port, addr, vid, db);
mutex_lock(&dp->addr_lists_lock);
a = dsa_mac_addr_find(&dp->fdbs, addr, vid, db);
if (!a) {
err = -ENOENT;
goto out;
}
if (!refcount_dec_and_test(&a->refcount))
goto out;
err = ds->ops->port_fdb_del(ds, port, addr, vid, db);
if (err) {
refcount_set(&a->refcount, 1);
goto out;
}
list_del(&a->list);
kfree(a);
out:
mutex_unlock(&dp->addr_lists_lock);
return err;
}
static int dsa_switch_do_lag_fdb_add(struct dsa_switch *ds, struct dsa_lag *lag,
const unsigned char *addr, u16 vid,
struct dsa_db db)
{
struct dsa_mac_addr *a;
int err = 0;
mutex_lock(&lag->fdb_lock);
a = dsa_mac_addr_find(&lag->fdbs, addr, vid, db);
if (a) {
refcount_inc(&a->refcount);
goto out;
}
a = kzalloc(sizeof(*a), GFP_KERNEL);
if (!a) {
err = -ENOMEM;
goto out;
}
err = ds->ops->lag_fdb_add(ds, *lag, addr, vid, db);
if (err) {
kfree(a);
goto out;
}
ether_addr_copy(a->addr, addr);
a->vid = vid;
refcount_set(&a->refcount, 1);
list_add_tail(&a->list, &lag->fdbs);
out:
mutex_unlock(&lag->fdb_lock);
return err;
}
static int dsa_switch_do_lag_fdb_del(struct dsa_switch *ds, struct dsa_lag *lag,
const unsigned char *addr, u16 vid,
struct dsa_db db)
{
struct dsa_mac_addr *a;
int err = 0;
mutex_lock(&lag->fdb_lock);
a = dsa_mac_addr_find(&lag->fdbs, addr, vid, db);
if (!a) {
err = -ENOENT;
goto out;
}
if (!refcount_dec_and_test(&a->refcount))
goto out;
err = ds->ops->lag_fdb_del(ds, *lag, addr, vid, db);
if (err) {
refcount_set(&a->refcount, 1);
goto out;
}
list_del(&a->list);
kfree(a);
out:
mutex_unlock(&lag->fdb_lock);
return err;
}
static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
struct dsa_notifier_fdb_info *info)
{
struct dsa_port *dp;
int err = 0;
if (!ds->ops->port_fdb_add)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_host_address_match(dp, info->sw_index,
info->port)) {
err = dsa_port_do_fdb_add(dp, info->addr, info->vid,
info->db);
if (err)
break;
}
}
return err;
}
static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
struct dsa_notifier_fdb_info *info)
{
struct dsa_port *dp;
int err = 0;
if (!ds->ops->port_fdb_del)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_host_address_match(dp, info->sw_index,
info->port)) {
err = dsa_port_do_fdb_del(dp, info->addr, info->vid,
info->db);
if (err)
break;
}
}
return err;
}
static int dsa_switch_fdb_add(struct dsa_switch *ds,
struct dsa_notifier_fdb_info *info)
{
int port = dsa_towards_port(ds, info->sw_index, info->port);
struct dsa_port *dp = dsa_to_port(ds, port);
if (!ds->ops->port_fdb_add)
return -EOPNOTSUPP;
return dsa_port_do_fdb_add(dp, info->addr, info->vid, info->db);
}
static int dsa_switch_fdb_del(struct dsa_switch *ds,
struct dsa_notifier_fdb_info *info)
{
int port = dsa_towards_port(ds, info->sw_index, info->port);
struct dsa_port *dp = dsa_to_port(ds, port);
if (!ds->ops->port_fdb_del)
return -EOPNOTSUPP;
return dsa_port_do_fdb_del(dp, info->addr, info->vid, info->db);
}
static int dsa_switch_lag_fdb_add(struct dsa_switch *ds,
struct dsa_notifier_lag_fdb_info *info)
{
struct dsa_port *dp;
if (!ds->ops->lag_fdb_add)
return -EOPNOTSUPP;
/* Notify switch only if it has a port in this LAG */
dsa_switch_for_each_port(dp, ds)
if (dsa_port_offloads_lag(dp, info->lag))
return dsa_switch_do_lag_fdb_add(ds, info->lag,
info->addr, info->vid,
info->db);
return 0;
}
static int dsa_switch_lag_fdb_del(struct dsa_switch *ds,
struct dsa_notifier_lag_fdb_info *info)
{
struct dsa_port *dp;
if (!ds->ops->lag_fdb_del)
return -EOPNOTSUPP;
/* Notify switch only if it has a port in this LAG */
dsa_switch_for_each_port(dp, ds)
if (dsa_port_offloads_lag(dp, info->lag))
return dsa_switch_do_lag_fdb_del(ds, info->lag,
info->addr, info->vid,
info->db);
return 0;
}
static int dsa_switch_lag_change(struct dsa_switch *ds,
struct dsa_notifier_lag_info *info)
{
if (ds->index == info->sw_index && ds->ops->port_lag_change)
return ds->ops->port_lag_change(ds, info->port);
if (ds->index != info->sw_index && ds->ops->crosschip_lag_change)
return ds->ops->crosschip_lag_change(ds, info->sw_index,
info->port);
return 0;
}
static int dsa_switch_lag_join(struct dsa_switch *ds,
struct dsa_notifier_lag_info *info)
{
if (ds->index == info->sw_index && ds->ops->port_lag_join)
return ds->ops->port_lag_join(ds, info->port, info->lag,
info->info);
if (ds->index != info->sw_index && ds->ops->crosschip_lag_join)
return ds->ops->crosschip_lag_join(ds, info->sw_index,
info->port, info->lag,
info->info);
return -EOPNOTSUPP;
}
static int dsa_switch_lag_leave(struct dsa_switch *ds,
struct dsa_notifier_lag_info *info)
{
if (ds->index == info->sw_index && ds->ops->port_lag_leave)
return ds->ops->port_lag_leave(ds, info->port, info->lag);
if (ds->index != info->sw_index && ds->ops->crosschip_lag_leave)
return ds->ops->crosschip_lag_leave(ds, info->sw_index,
info->port, info->lag);
return -EOPNOTSUPP;
}
static int dsa_switch_mdb_add(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
int port = dsa_towards_port(ds, info->sw_index, info->port);
struct dsa_port *dp = dsa_to_port(ds, port);
if (!ds->ops->port_mdb_add)
return -EOPNOTSUPP;
return dsa_port_do_mdb_add(dp, info->mdb, info->db);
}
static int dsa_switch_mdb_del(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
int port = dsa_towards_port(ds, info->sw_index, info->port);
struct dsa_port *dp = dsa_to_port(ds, port);
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
return dsa_port_do_mdb_del(dp, info->mdb, info->db);
}
static int dsa_switch_host_mdb_add(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
struct dsa_port *dp;
int err = 0;
if (!ds->ops->port_mdb_add)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_host_address_match(dp, info->sw_index,
info->port)) {
err = dsa_port_do_mdb_add(dp, info->mdb, info->db);
if (err)
break;
}
}
return err;
}
static int dsa_switch_host_mdb_del(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
struct dsa_port *dp;
int err = 0;
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_host_address_match(dp, info->sw_index,
info->port)) {
err = dsa_port_do_mdb_del(dp, info->mdb, info->db);
if (err)
break;
}
}
return err;
}
/* Port VLANs match on the targeted port and on all DSA ports */
static bool dsa_port_vlan_match(struct dsa_port *dp,
struct dsa_notifier_vlan_info *info)
{
if (dp->ds->index == info->sw_index && dp->index == info->port)
return true;
if (dsa_port_is_dsa(dp))
return true;
return false;
}
/* Host VLANs match on the targeted port's CPU port, and on all DSA ports
* (upstream and downstream) of that switch and its upstream switches.
*/
static bool dsa_port_host_vlan_match(struct dsa_port *dp,
struct dsa_notifier_vlan_info *info)
{
struct dsa_port *targeted_dp, *cpu_dp;
struct dsa_switch *targeted_ds;
targeted_ds = dsa_switch_find(dp->ds->dst->index, info->sw_index);
targeted_dp = dsa_to_port(targeted_ds, info->port);
cpu_dp = targeted_dp->cpu_dp;
if (dsa_switch_is_upstream_of(dp->ds, targeted_ds))
return dsa_port_is_dsa(dp) || dp == cpu_dp;
return false;
}
static struct dsa_vlan *dsa_vlan_find(struct list_head *vlan_list,
const struct switchdev_obj_port_vlan *vlan)
{
struct dsa_vlan *v;
list_for_each_entry(v, vlan_list, list)
if (v->vid == vlan->vid)
return v;
return NULL;
}
static int dsa_port_do_vlan_add(struct dsa_port *dp,
const struct switchdev_obj_port_vlan *vlan,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
struct dsa_vlan *v;
int err = 0;
/* No need to bother with refcounting for user ports. */
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
return ds->ops->port_vlan_add(ds, port, vlan, extack);
/* No need to propagate on shared ports the existing VLANs that were
* re-notified after just the flags have changed. This would cause a
* refcount bump which we need to avoid, since it unbalances the
* additions with the deletions.
*/
if (vlan->changed)
return 0;
mutex_lock(&dp->vlans_lock);
v = dsa_vlan_find(&dp->vlans, vlan);
if (v) {
refcount_inc(&v->refcount);
goto out;
}
v = kzalloc(sizeof(*v), GFP_KERNEL);
if (!v) {
err = -ENOMEM;
goto out;
}
err = ds->ops->port_vlan_add(ds, port, vlan, extack);
if (err) {
kfree(v);
goto out;
}
v->vid = vlan->vid;
refcount_set(&v->refcount, 1);
list_add_tail(&v->list, &dp->vlans);
out:
mutex_unlock(&dp->vlans_lock);
return err;
}
static int dsa_port_do_vlan_del(struct dsa_port *dp,
const struct switchdev_obj_port_vlan *vlan)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
struct dsa_vlan *v;
int err = 0;
/* No need to bother with refcounting for user ports */
if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
return ds->ops->port_vlan_del(ds, port, vlan);
mutex_lock(&dp->vlans_lock);
v = dsa_vlan_find(&dp->vlans, vlan);
if (!v) {
err = -ENOENT;
goto out;
}
if (!refcount_dec_and_test(&v->refcount))
goto out;
err = ds->ops->port_vlan_del(ds, port, vlan);
if (err) {
refcount_set(&v->refcount, 1);
goto out;
}
list_del(&v->list);
kfree(v);
out:
mutex_unlock(&dp->vlans_lock);
return err;
}
static int dsa_switch_vlan_add(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
struct dsa_port *dp;
int err;
if (!ds->ops->port_vlan_add)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_vlan_match(dp, info)) {
err = dsa_port_do_vlan_add(dp, info->vlan,
info->extack);
if (err)
return err;
}
}
return 0;
}
static int dsa_switch_vlan_del(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
struct dsa_port *dp;
int err;
if (!ds->ops->port_vlan_del)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_vlan_match(dp, info)) {
err = dsa_port_do_vlan_del(dp, info->vlan);
if (err)
return err;
}
}
return 0;
}
static int dsa_switch_host_vlan_add(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
struct dsa_port *dp;
int err;
if (!ds->ops->port_vlan_add)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_host_vlan_match(dp, info)) {
err = dsa_port_do_vlan_add(dp, info->vlan,
info->extack);
if (err)
return err;
}
}
return 0;
}
static int dsa_switch_host_vlan_del(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
struct dsa_port *dp;
int err;
if (!ds->ops->port_vlan_del)
return -EOPNOTSUPP;
dsa_switch_for_each_port(dp, ds) {
if (dsa_port_host_vlan_match(dp, info)) {
err = dsa_port_do_vlan_del(dp, info->vlan);
if (err)
return err;
}
}
return 0;
}
static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
struct dsa_notifier_tag_proto_info *info)
{
const struct dsa_device_ops *tag_ops = info->tag_ops;
struct dsa_port *dp, *cpu_dp;
int err;
if (!ds->ops->change_tag_protocol)
return -EOPNOTSUPP;
ASSERT_RTNL();
dsa_switch_for_each_cpu_port(cpu_dp, ds) {
err = ds->ops->change_tag_protocol(ds, cpu_dp->index,
tag_ops->proto);
if (err)
return err;
dsa_port_set_tag_protocol(cpu_dp, tag_ops);
}
/* Now that changing the tag protocol can no longer fail, let's update
* the remaining bits which are "duplicated for faster access", and the
* bits that depend on the tagger, such as the MTU.
*/
dsa_switch_for_each_user_port(dp, ds) {
struct net_device *slave = dp->slave;
dsa_slave_setup_tagger(slave);
/* rtnl_mutex is held in dsa_tree_change_tag_proto */
dsa_slave_change_mtu(slave, slave->mtu);
}
return 0;
}
/* We use the same cross-chip notifiers to inform both the tagger side, as well
* as the switch side, of connection and disconnection events.
* Since ds->tagger_data is owned by the tagger, it isn't a hard error if the
* switch side doesn't support connecting to this tagger, and therefore, the
* fact that we don't disconnect the tagger side doesn't constitute a memory
* leak: the tagger will still operate with persistent per-switch memory, just
* with the switch side unconnected to it. What does constitute a hard error is
* when the switch side supports connecting but fails.
*/
static int
dsa_switch_connect_tag_proto(struct dsa_switch *ds,
struct dsa_notifier_tag_proto_info *info)
{
const struct dsa_device_ops *tag_ops = info->tag_ops;
int err;
/* Notify the new tagger about the connection to this switch */
if (tag_ops->connect) {
err = tag_ops->connect(ds);
if (err)
return err;
}
if (!ds->ops->connect_tag_protocol)
return -EOPNOTSUPP;
/* Notify the switch about the connection to the new tagger */
err = ds->ops->connect_tag_protocol(ds, tag_ops->proto);
if (err) {
/* Revert the new tagger's connection to this tree */
if (tag_ops->disconnect)
tag_ops->disconnect(ds);
return err;
}
return 0;
}
static int
dsa_switch_disconnect_tag_proto(struct dsa_switch *ds,
struct dsa_notifier_tag_proto_info *info)
{
const struct dsa_device_ops *tag_ops = info->tag_ops;
/* Notify the tagger about the disconnection from this switch */
if (tag_ops->disconnect && ds->tagger_data)
tag_ops->disconnect(ds);
/* No need to notify the switch, since it shouldn't have any
* resources to tear down
*/
return 0;
}
static int
dsa_switch_master_state_change(struct dsa_switch *ds,
struct dsa_notifier_master_state_info *info)
{
if (!ds->ops->master_state_change)
return 0;
ds->ops->master_state_change(ds, info->master, info->operational);
return 0;
}
static int dsa_switch_event(struct notifier_block *nb,
unsigned long event, void *info)
{
struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
int err;