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dsa.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DSA topology and switch handling
*
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <[email protected]>
* Copyright (c) 2016 Andrew Lunn <[email protected]>
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <net/sch_generic.h>
#include "devlink.h"
#include "dsa.h"
#include "master.h"
#include "netlink.h"
#include "port.h"
#include "slave.h"
#include "switch.h"
#include "tag.h"
#define DSA_MAX_NUM_OFFLOADING_BRIDGES BITS_PER_LONG
static DEFINE_MUTEX(dsa2_mutex);
LIST_HEAD(dsa_tree_list);
static struct workqueue_struct *dsa_owq;
/* Track the bridges with forwarding offload enabled */
static unsigned long dsa_fwd_offloading_bridges;
bool dsa_schedule_work(struct work_struct *work)
{
return queue_work(dsa_owq, work);
}
void dsa_flush_workqueue(void)
{
flush_workqueue(dsa_owq);
}
EXPORT_SYMBOL_GPL(dsa_flush_workqueue);
/**
* dsa_lag_map() - Map LAG structure to a linear LAG array
* @dst: Tree in which to record the mapping.
* @lag: LAG structure that is to be mapped to the tree's array.
*
* dsa_lag_id/dsa_lag_by_id can then be used to translate between the
* two spaces. The size of the mapping space is determined by the
* driver by setting ds->num_lag_ids. It is perfectly legal to leave
* it unset if it is not needed, in which case these functions become
* no-ops.
*/
void dsa_lag_map(struct dsa_switch_tree *dst, struct dsa_lag *lag)
{
unsigned int id;
for (id = 1; id <= dst->lags_len; id++) {
if (!dsa_lag_by_id(dst, id)) {
dst->lags[id - 1] = lag;
lag->id = id;
return;
}
}
/* No IDs left, which is OK. Some drivers do not need it. The
* ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id
* returns an error for this device when joining the LAG. The
* driver can then return -EOPNOTSUPP back to DSA, which will
* fall back to a software LAG.
*/
}
/**
* dsa_lag_unmap() - Remove a LAG ID mapping
* @dst: Tree in which the mapping is recorded.
* @lag: LAG structure that was mapped.
*
* As there may be multiple users of the mapping, it is only removed
* if there are no other references to it.
*/
void dsa_lag_unmap(struct dsa_switch_tree *dst, struct dsa_lag *lag)
{
unsigned int id;
dsa_lags_foreach_id(id, dst) {
if (dsa_lag_by_id(dst, id) == lag) {
dst->lags[id - 1] = NULL;
lag->id = 0;
break;
}
}
}
struct dsa_lag *dsa_tree_lag_find(struct dsa_switch_tree *dst,
const struct net_device *lag_dev)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_lag_dev_get(dp) == lag_dev)
return dp->lag;
return NULL;
}
struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst,
const struct net_device *br)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_bridge_dev_get(dp) == br)
return dp->bridge;
return NULL;
}
static int dsa_bridge_num_find(const struct net_device *bridge_dev)
{
struct dsa_switch_tree *dst;
list_for_each_entry(dst, &dsa_tree_list, list) {
struct dsa_bridge *bridge;
bridge = dsa_tree_bridge_find(dst, bridge_dev);
if (bridge)
return bridge->num;
}
return 0;
}
unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max)
{
unsigned int bridge_num = dsa_bridge_num_find(bridge_dev);
/* Switches without FDB isolation support don't get unique
* bridge numbering
*/
if (!max)
return 0;
if (!bridge_num) {
/* First port that requests FDB isolation or TX forwarding
* offload for this bridge
*/
bridge_num = find_next_zero_bit(&dsa_fwd_offloading_bridges,
DSA_MAX_NUM_OFFLOADING_BRIDGES,
1);
if (bridge_num >= max)
return 0;
set_bit(bridge_num, &dsa_fwd_offloading_bridges);
}
return bridge_num;
}
void dsa_bridge_num_put(const struct net_device *bridge_dev,
unsigned int bridge_num)
{
/* Since we refcount bridges, we know that when we call this function
* it is no longer in use, so we can just go ahead and remove it from
* the bit mask.
*/
clear_bit(bridge_num, &dsa_fwd_offloading_bridges);
}
struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
{
struct dsa_switch_tree *dst;
struct dsa_port *dp;
list_for_each_entry(dst, &dsa_tree_list, list) {
if (dst->index != tree_index)
continue;
list_for_each_entry(dp, &dst->ports, list) {
if (dp->ds->index != sw_index)
continue;
return dp->ds;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(dsa_switch_find);
static struct dsa_switch_tree *dsa_tree_find(int index)
{
struct dsa_switch_tree *dst;
list_for_each_entry(dst, &dsa_tree_list, list)
if (dst->index == index)
return dst;
return NULL;
}
static struct dsa_switch_tree *dsa_tree_alloc(int index)
{
struct dsa_switch_tree *dst;
dst = kzalloc(sizeof(*dst), GFP_KERNEL);
if (!dst)
return NULL;
dst->index = index;
INIT_LIST_HEAD(&dst->rtable);
INIT_LIST_HEAD(&dst->ports);
INIT_LIST_HEAD(&dst->list);
list_add_tail(&dst->list, &dsa_tree_list);
kref_init(&dst->refcount);
return dst;
}
static void dsa_tree_free(struct dsa_switch_tree *dst)
{
if (dst->tag_ops)
dsa_tag_driver_put(dst->tag_ops);
list_del(&dst->list);
kfree(dst);
}
static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
{
if (dst)
kref_get(&dst->refcount);
return dst;
}
static struct dsa_switch_tree *dsa_tree_touch(int index)
{
struct dsa_switch_tree *dst;
dst = dsa_tree_find(index);
if (dst)
return dsa_tree_get(dst);
else
return dsa_tree_alloc(index);
}
static void dsa_tree_release(struct kref *ref)
{
struct dsa_switch_tree *dst;
dst = container_of(ref, struct dsa_switch_tree, refcount);
dsa_tree_free(dst);
}
static void dsa_tree_put(struct dsa_switch_tree *dst)
{
if (dst)
kref_put(&dst->refcount, dsa_tree_release);
}
static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
struct device_node *dn)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dp->dn == dn)
return dp;
return NULL;
}
static struct dsa_link *dsa_link_touch(struct dsa_port *dp,
struct dsa_port *link_dp)
{
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst;
struct dsa_link *dl;
dst = ds->dst;
list_for_each_entry(dl, &dst->rtable, list)
if (dl->dp == dp && dl->link_dp == link_dp)
return dl;
dl = kzalloc(sizeof(*dl), GFP_KERNEL);
if (!dl)
return NULL;
dl->dp = dp;
dl->link_dp = link_dp;
INIT_LIST_HEAD(&dl->list);
list_add_tail(&dl->list, &dst->rtable);
return dl;
}
static bool dsa_port_setup_routing_table(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst = ds->dst;
struct device_node *dn = dp->dn;
struct of_phandle_iterator it;
struct dsa_port *link_dp;
struct dsa_link *dl;
int err;
of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
link_dp = dsa_tree_find_port_by_node(dst, it.node);
if (!link_dp) {
of_node_put(it.node);
return false;
}
dl = dsa_link_touch(dp, link_dp);
if (!dl) {
of_node_put(it.node);
return false;
}
}
return true;
}
static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
{
bool complete = true;
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list) {
if (dsa_port_is_dsa(dp)) {
complete = dsa_port_setup_routing_table(dp);
if (!complete)
break;
}
}
return complete;
}
static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_cpu(dp))
return dp;
return NULL;
}
struct net_device *dsa_tree_find_first_master(struct dsa_switch_tree *dst)
{
struct device_node *ethernet;
struct net_device *master;
struct dsa_port *cpu_dp;
cpu_dp = dsa_tree_find_first_cpu(dst);
ethernet = of_parse_phandle(cpu_dp->dn, "ethernet", 0);
master = of_find_net_device_by_node(ethernet);
of_node_put(ethernet);
return master;
}
/* Assign the default CPU port (the first one in the tree) to all ports of the
* fabric which don't already have one as part of their own switch.
*/
static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
{
struct dsa_port *cpu_dp, *dp;
cpu_dp = dsa_tree_find_first_cpu(dst);
if (!cpu_dp) {
pr_err("DSA: tree %d has no CPU port\n", dst->index);
return -EINVAL;
}
list_for_each_entry(dp, &dst->ports, list) {
if (dp->cpu_dp)
continue;
if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
dp->cpu_dp = cpu_dp;
}
return 0;
}
/* Perform initial assignment of CPU ports to user ports and DSA links in the
* fabric, giving preference to CPU ports local to each switch. Default to
* using the first CPU port in the switch tree if the port does not have a CPU
* port local to this switch.
*/
static int dsa_tree_setup_cpu_ports(struct dsa_switch_tree *dst)
{
struct dsa_port *cpu_dp, *dp;
list_for_each_entry(cpu_dp, &dst->ports, list) {
if (!dsa_port_is_cpu(cpu_dp))
continue;
/* Prefer a local CPU port */
dsa_switch_for_each_port(dp, cpu_dp->ds) {
/* Prefer the first local CPU port found */
if (dp->cpu_dp)
continue;
if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
dp->cpu_dp = cpu_dp;
}
}
return dsa_tree_setup_default_cpu(dst);
}
static void dsa_tree_teardown_cpu_ports(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
dp->cpu_dp = NULL;
}
static int dsa_port_setup(struct dsa_port *dp)
{
bool dsa_port_link_registered = false;
struct dsa_switch *ds = dp->ds;
bool dsa_port_enabled = false;
int err = 0;
if (dp->setup)
return 0;
err = dsa_port_devlink_setup(dp);
if (err)
return err;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
dsa_port_disable(dp);
break;
case DSA_PORT_TYPE_CPU:
if (dp->dn) {
err = dsa_shared_port_link_register_of(dp);
if (err)
break;
dsa_port_link_registered = true;
} else {
dev_warn(ds->dev,
"skipping link registration for CPU port %d\n",
dp->index);
}
err = dsa_port_enable(dp, NULL);
if (err)
break;
dsa_port_enabled = true;
break;
case DSA_PORT_TYPE_DSA:
if (dp->dn) {
err = dsa_shared_port_link_register_of(dp);
if (err)
break;
dsa_port_link_registered = true;
} else {
dev_warn(ds->dev,
"skipping link registration for DSA port %d\n",
dp->index);
}
err = dsa_port_enable(dp, NULL);
if (err)
break;
dsa_port_enabled = true;
break;
case DSA_PORT_TYPE_USER:
of_get_mac_address(dp->dn, dp->mac);
err = dsa_slave_create(dp);
break;
}
if (err && dsa_port_enabled)
dsa_port_disable(dp);
if (err && dsa_port_link_registered)
dsa_shared_port_link_unregister_of(dp);
if (err) {
dsa_port_devlink_teardown(dp);
return err;
}
dp->setup = true;
return 0;
}
static void dsa_port_teardown(struct dsa_port *dp)
{
if (!dp->setup)
return;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
break;
case DSA_PORT_TYPE_CPU:
dsa_port_disable(dp);
if (dp->dn)
dsa_shared_port_link_unregister_of(dp);
break;
case DSA_PORT_TYPE_DSA:
dsa_port_disable(dp);
if (dp->dn)
dsa_shared_port_link_unregister_of(dp);
break;
case DSA_PORT_TYPE_USER:
if (dp->slave) {
dsa_slave_destroy(dp->slave);
dp->slave = NULL;
}
break;
}
dsa_port_devlink_teardown(dp);
dp->setup = false;
}
static int dsa_port_setup_as_unused(struct dsa_port *dp)
{
dp->type = DSA_PORT_TYPE_UNUSED;
return dsa_port_setup(dp);
}
static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds)
{
const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
struct dsa_switch_tree *dst = ds->dst;
int err;
if (tag_ops->proto == dst->default_proto)
goto connect;
rtnl_lock();
err = ds->ops->change_tag_protocol(ds, tag_ops->proto);
rtnl_unlock();
if (err) {
dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n",
tag_ops->name, ERR_PTR(err));
return err;
}
connect:
if (tag_ops->connect) {
err = tag_ops->connect(ds);
if (err)
return err;
}
if (ds->ops->connect_tag_protocol) {
err = ds->ops->connect_tag_protocol(ds, tag_ops->proto);
if (err) {
dev_err(ds->dev,
"Unable to connect to tag protocol \"%s\": %pe\n",
tag_ops->name, ERR_PTR(err));
goto disconnect;
}
}
return 0;
disconnect:
if (tag_ops->disconnect)
tag_ops->disconnect(ds);
return err;
}
static void dsa_switch_teardown_tag_protocol(struct dsa_switch *ds)
{
const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
if (tag_ops->disconnect)
tag_ops->disconnect(ds);
}
static int dsa_switch_setup(struct dsa_switch *ds)
{
struct device_node *dn;
int err;
if (ds->setup)
return 0;
/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
* driver and before ops->setup() has run, since the switch drivers and
* the slave MDIO bus driver rely on these values for probing PHY
* devices or not
*/
ds->phys_mii_mask |= dsa_user_ports(ds);
err = dsa_switch_devlink_alloc(ds);
if (err)
return err;
err = dsa_switch_register_notifier(ds);
if (err)
goto devlink_free;
ds->configure_vlan_while_not_filtering = true;
err = ds->ops->setup(ds);
if (err < 0)
goto unregister_notifier;
err = dsa_switch_setup_tag_protocol(ds);
if (err)
goto teardown;
if (!ds->slave_mii_bus && ds->ops->phy_read) {
ds->slave_mii_bus = mdiobus_alloc();
if (!ds->slave_mii_bus) {
err = -ENOMEM;
goto teardown;
}
dsa_slave_mii_bus_init(ds);
dn = of_get_child_by_name(ds->dev->of_node, "mdio");
err = of_mdiobus_register(ds->slave_mii_bus, dn);
of_node_put(dn);
if (err < 0)
goto free_slave_mii_bus;
}
dsa_switch_devlink_register(ds);
ds->setup = true;
return 0;
free_slave_mii_bus:
if (ds->slave_mii_bus && ds->ops->phy_read)
mdiobus_free(ds->slave_mii_bus);
teardown:
if (ds->ops->teardown)
ds->ops->teardown(ds);
unregister_notifier:
dsa_switch_unregister_notifier(ds);
devlink_free:
dsa_switch_devlink_free(ds);
return err;
}
static void dsa_switch_teardown(struct dsa_switch *ds)
{
if (!ds->setup)
return;
dsa_switch_devlink_unregister(ds);
if (ds->slave_mii_bus && ds->ops->phy_read) {
mdiobus_unregister(ds->slave_mii_bus);
mdiobus_free(ds->slave_mii_bus);
ds->slave_mii_bus = NULL;
}
dsa_switch_teardown_tag_protocol(ds);
if (ds->ops->teardown)
ds->ops->teardown(ds);
dsa_switch_unregister_notifier(ds);
dsa_switch_devlink_free(ds);
ds->setup = false;
}
/* First tear down the non-shared, then the shared ports. This ensures that
* all work items scheduled by our switchdev handlers for user ports have
* completed before we destroy the refcounting kept on the shared ports.
*/
static void dsa_tree_teardown_ports(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_user(dp) || dsa_port_is_unused(dp))
dsa_port_teardown(dp);
dsa_flush_workqueue();
list_for_each_entry(dp, &dst->ports, list)
if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp))
dsa_port_teardown(dp);
}
static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list)
dsa_switch_teardown(dp->ds);
}
/* Bring shared ports up first, then non-shared ports */
static int dsa_tree_setup_ports(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
int err = 0;
list_for_each_entry(dp, &dst->ports, list) {
if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp)) {
err = dsa_port_setup(dp);
if (err)
goto teardown;
}
}
list_for_each_entry(dp, &dst->ports, list) {
if (dsa_port_is_user(dp) || dsa_port_is_unused(dp)) {
err = dsa_port_setup(dp);
if (err) {
err = dsa_port_setup_as_unused(dp);
if (err)
goto teardown;
}
}
}
return 0;
teardown:
dsa_tree_teardown_ports(dst);
return err;
}
static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
{
struct dsa_port *dp;
int err = 0;
list_for_each_entry(dp, &dst->ports, list) {
err = dsa_switch_setup(dp->ds);
if (err) {
dsa_tree_teardown_switches(dst);
break;
}
}
return err;
}
static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
{
struct dsa_port *cpu_dp;
int err = 0;
rtnl_lock();
dsa_tree_for_each_cpu_port(cpu_dp, dst) {
struct net_device *master = cpu_dp->master;
bool admin_up = (master->flags & IFF_UP) &&
!qdisc_tx_is_noop(master);
err = dsa_master_setup(master, cpu_dp);
if (err)
break;
/* Replay master state event */
dsa_tree_master_admin_state_change(dst, master, admin_up);
dsa_tree_master_oper_state_change(dst, master,
netif_oper_up(master));
}
rtnl_unlock();
return err;
}
static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
{
struct dsa_port *cpu_dp;
rtnl_lock();
dsa_tree_for_each_cpu_port(cpu_dp, dst) {
struct net_device *master = cpu_dp->master;
/* Synthesizing an "admin down" state is sufficient for
* the switches to get a notification if the master is
* currently up and running.
*/
dsa_tree_master_admin_state_change(dst, master, false);
dsa_master_teardown(master);
}
rtnl_unlock();
}
static int dsa_tree_setup_lags(struct dsa_switch_tree *dst)
{
unsigned int len = 0;
struct dsa_port *dp;
list_for_each_entry(dp, &dst->ports, list) {
if (dp->ds->num_lag_ids > len)
len = dp->ds->num_lag_ids;
}
if (!len)
return 0;
dst->lags = kcalloc(len, sizeof(*dst->lags), GFP_KERNEL);
if (!dst->lags)
return -ENOMEM;
dst->lags_len = len;
return 0;
}
static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst)
{
kfree(dst->lags);
}
static int dsa_tree_setup(struct dsa_switch_tree *dst)
{
bool complete;
int err;
if (dst->setup) {
pr_err("DSA: tree %d already setup! Disjoint trees?\n",
dst->index);
return -EEXIST;
}
complete = dsa_tree_setup_routing_table(dst);
if (!complete)
return 0;
err = dsa_tree_setup_cpu_ports(dst);
if (err)
return err;
err = dsa_tree_setup_switches(dst);
if (err)
goto teardown_cpu_ports;
err = dsa_tree_setup_ports(dst);
if (err)
goto teardown_switches;
err = dsa_tree_setup_master(dst);
if (err)
goto teardown_ports;
err = dsa_tree_setup_lags(dst);
if (err)
goto teardown_master;
dst->setup = true;
pr_info("DSA: tree %d setup\n", dst->index);
return 0;
teardown_master:
dsa_tree_teardown_master(dst);
teardown_ports:
dsa_tree_teardown_ports(dst);
teardown_switches:
dsa_tree_teardown_switches(dst);
teardown_cpu_ports:
dsa_tree_teardown_cpu_ports(dst);
return err;
}
static void dsa_tree_teardown(struct dsa_switch_tree *dst)
{
struct dsa_link *dl, *next;
if (!dst->setup)
return;
dsa_tree_teardown_lags(dst);
dsa_tree_teardown_master(dst);
dsa_tree_teardown_ports(dst);
dsa_tree_teardown_switches(dst);
dsa_tree_teardown_cpu_ports(dst);
list_for_each_entry_safe(dl, next, &dst->rtable, list) {
list_del(&dl->list);
kfree(dl);
}
pr_info("DSA: tree %d torn down\n", dst->index);
dst->setup = false;
}
static int dsa_tree_bind_tag_proto(struct dsa_switch_tree *dst,
const struct dsa_device_ops *tag_ops)
{
const struct dsa_device_ops *old_tag_ops = dst->tag_ops;
struct dsa_notifier_tag_proto_info info;
int err;
dst->tag_ops = tag_ops;
/* Notify the switches from this tree about the connection
* to the new tagger
*/
info.tag_ops = tag_ops;
err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_CONNECT, &info);
if (err && err != -EOPNOTSUPP)
goto out_disconnect;
/* Notify the old tagger about the disconnection from this tree */
info.tag_ops = old_tag_ops;
dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info);
return 0;
out_disconnect:
info.tag_ops = tag_ops;
dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info);
dst->tag_ops = old_tag_ops;
return err;
}
/* Since the dsa/tagging sysfs device attribute is per master, the assumption
* is that all DSA switches within a tree share the same tagger, otherwise
* they would have formed disjoint trees (different "dsa,member" values).
*/
int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
const struct dsa_device_ops *tag_ops,
const struct dsa_device_ops *old_tag_ops)
{
struct dsa_notifier_tag_proto_info info;
struct dsa_port *dp;
int err = -EBUSY;
if (!rtnl_trylock())
return restart_syscall();
/* At the moment we don't allow changing the tag protocol under
* traffic. The rtnl_mutex also happens to serialize concurrent
* attempts to change the tagging protocol. If we ever lift the IFF_UP
* restriction, there needs to be another mutex which serializes this.
*/
dsa_tree_for_each_user_port(dp, dst) {
if (dsa_port_to_master(dp)->flags & IFF_UP)
goto out_unlock;
if (dp->slave->flags & IFF_UP)
goto out_unlock;
}
/* Notify the tag protocol change */
info.tag_ops = tag_ops;
err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info);
if (err)
goto out_unwind_tagger;
err = dsa_tree_bind_tag_proto(dst, tag_ops);
if (err)
goto out_unwind_tagger;
rtnl_unlock();
return 0;
out_unwind_tagger: