linux/net/dsa/switch.c
Vladimir Oltean 3f6e32f92a net: dsa: reference count the FDB addresses at the cross-chip notifier level
The same concerns expressed for host MDB entries are valid for host FDBs
just as well:

- in the case of multiple bridges spanning the same switch chip, deleting
  a host FDB entry that belongs to one bridge will result in breakage to
  the other bridge
- not deleting FDB entries across DSA links means that the switch's
  hardware tables will eventually run out, given enough wear&tear

So do the same thing and introduce reference counting for CPU ports and
DSA links using the same data structures as we have for MDB entries.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-29 10:46:23 -07:00

756 lines
18 KiB
C

// 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 <vivien.didelot@savoirfairelinux.com>
*/
#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)
{
int i;
for (i = 0; i < ds->num_ports; ++i) {
struct dsa_port *dp = dsa_to_port(ds, i);
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_switch_mtu_match(struct dsa_switch *ds, int port,
struct dsa_notifier_mtu_info *info)
{
if (ds->index == info->sw_index && port == 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_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
return true;
return false;
}
static int dsa_switch_mtu(struct dsa_switch *ds,
struct dsa_notifier_mtu_info *info)
{
int port, ret;
if (!ds->ops->port_change_mtu)
return -EOPNOTSUPP;
for (port = 0; port < ds->num_ports; port++) {
if (dsa_switch_mtu_match(ds, port, info)) {
ret = ds->ops->port_change_mtu(ds, port, 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;
if (dst->index == info->tree_index && ds->index == info->sw_index &&
ds->ops->port_bridge_join)
return ds->ops->port_bridge_join(ds, info->port, info->br);
if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
ds->ops->crosschip_bridge_join)
return ds->ops->crosschip_bridge_join(ds, info->tree_index,
info->sw_index,
info->port, info->br);
return 0;
}
static int dsa_switch_bridge_leave(struct dsa_switch *ds,
struct dsa_notifier_bridge_info *info)
{
bool unset_vlan_filtering = br_vlan_enabled(info->br);
struct dsa_switch_tree *dst = ds->dst;
struct netlink_ext_ack extack = {0};
int err, port;
if (dst->index == info->tree_index && ds->index == info->sw_index &&
ds->ops->port_bridge_join)
ds->ops->port_bridge_leave(ds, info->port, info->br);
if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
ds->ops->crosschip_bridge_join)
ds->ops->crosschip_bridge_leave(ds, info->tree_index,
info->sw_index, info->port,
info->br);
/* 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 (unset_vlan_filtering && ds->vlan_filtering_is_global) {
for (port = 0; port < ds->num_ports; port++) {
struct net_device *bridge_dev;
bridge_dev = dsa_to_port(ds, port)->bridge_dev;
if (bridge_dev && br_vlan_enabled(bridge_dev)) {
unset_vlan_filtering = false;
break;
}
}
}
if (unset_vlan_filtering) {
err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
false, &extack);
if (extack._msg)
dev_err(ds->dev, "port %d: %s\n", info->port,
extack._msg);
if (err && err != EOPNOTSUPP)
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_switch_host_address_match(struct dsa_switch *ds, int port,
int info_sw_index, int info_port)
{
struct dsa_port *targeted_dp, *cpu_dp;
struct dsa_switch *targeted_ds;
targeted_ds = dsa_switch_find(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(ds, targeted_ds))
return port == dsa_towards_port(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_mac_addr *a;
list_for_each_entry(a, addr_list, list)
if (ether_addr_equal(a->addr, addr) && a->vid == vid)
return a;
return NULL;
}
static int dsa_switch_do_mdb_add(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb)
{
struct dsa_port *dp = dsa_to_port(ds, port);
struct dsa_mac_addr *a;
int err;
/* 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);
a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid);
if (a) {
refcount_inc(&a->refcount);
return 0;
}
a = kzalloc(sizeof(*a), GFP_KERNEL);
if (!a)
return -ENOMEM;
err = ds->ops->port_mdb_add(ds, port, mdb);
if (err) {
kfree(a);
return err;
}
ether_addr_copy(a->addr, mdb->addr);
a->vid = mdb->vid;
refcount_set(&a->refcount, 1);
list_add_tail(&a->list, &dp->mdbs);
return 0;
}
static int dsa_switch_do_mdb_del(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb)
{
struct dsa_port *dp = dsa_to_port(ds, port);
struct dsa_mac_addr *a;
int err;
/* 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);
a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid);
if (!a)
return -ENOENT;
if (!refcount_dec_and_test(&a->refcount))
return 0;
err = ds->ops->port_mdb_del(ds, port, mdb);
if (err) {
refcount_inc(&a->refcount);
return err;
}
list_del(&a->list);
kfree(a);
return 0;
}
static int dsa_switch_do_fdb_add(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid)
{
struct dsa_port *dp = dsa_to_port(ds, port);
struct dsa_mac_addr *a;
int err;
/* 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);
a = dsa_mac_addr_find(&dp->fdbs, addr, vid);
if (a) {
refcount_inc(&a->refcount);
return 0;
}
a = kzalloc(sizeof(*a), GFP_KERNEL);
if (!a)
return -ENOMEM;
err = ds->ops->port_fdb_add(ds, port, addr, vid);
if (err) {
kfree(a);
return err;
}
ether_addr_copy(a->addr, addr);
a->vid = vid;
refcount_set(&a->refcount, 1);
list_add_tail(&a->list, &dp->fdbs);
return 0;
}
static int dsa_switch_do_fdb_del(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid)
{
struct dsa_port *dp = dsa_to_port(ds, port);
struct dsa_mac_addr *a;
int err;
/* 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);
a = dsa_mac_addr_find(&dp->fdbs, addr, vid);
if (!a)
return -ENOENT;
if (!refcount_dec_and_test(&a->refcount))
return 0;
err = ds->ops->port_fdb_del(ds, port, addr, vid);
if (err) {
refcount_inc(&a->refcount);
return err;
}
list_del(&a->list);
kfree(a);
return 0;
}
static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
struct dsa_notifier_fdb_info *info)
{
int err = 0;
int port;
if (!ds->ops->port_fdb_add)
return -EOPNOTSUPP;
for (port = 0; port < ds->num_ports; port++) {
if (dsa_switch_host_address_match(ds, port, info->sw_index,
info->port)) {
err = dsa_switch_do_fdb_add(ds, port, info->addr,
info->vid);
if (err)
break;
}
}
return err;
}
static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
struct dsa_notifier_fdb_info *info)
{
int err = 0;
int port;
if (!ds->ops->port_fdb_del)
return -EOPNOTSUPP;
for (port = 0; port < ds->num_ports; port++) {
if (dsa_switch_host_address_match(ds, port, info->sw_index,
info->port)) {
err = dsa_switch_do_fdb_del(ds, port, info->addr,
info->vid);
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);
if (!ds->ops->port_fdb_add)
return -EOPNOTSUPP;
return dsa_switch_do_fdb_add(ds, port, info->addr, info->vid);
}
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);
if (!ds->ops->port_fdb_del)
return -EOPNOTSUPP;
return dsa_switch_do_fdb_del(ds, port, info->addr, info->vid);
}
static int dsa_switch_hsr_join(struct dsa_switch *ds,
struct dsa_notifier_hsr_info *info)
{
if (ds->index == info->sw_index && ds->ops->port_hsr_join)
return ds->ops->port_hsr_join(ds, info->port, info->hsr);
return -EOPNOTSUPP;
}
static int dsa_switch_hsr_leave(struct dsa_switch *ds,
struct dsa_notifier_hsr_info *info)
{
if (ds->index == info->sw_index && ds->ops->port_hsr_leave)
return ds->ops->port_hsr_leave(ds, info->port, info->hsr);
return -EOPNOTSUPP;
}
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 0;
}
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 0;
}
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);
if (!ds->ops->port_mdb_add)
return -EOPNOTSUPP;
return dsa_switch_do_mdb_add(ds, port, info->mdb);
}
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);
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
return dsa_switch_do_mdb_del(ds, port, info->mdb);
}
static int dsa_switch_host_mdb_add(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
int err = 0;
int port;
if (!ds->ops->port_mdb_add)
return -EOPNOTSUPP;
for (port = 0; port < ds->num_ports; port++) {
if (dsa_switch_host_address_match(ds, port, info->sw_index,
info->port)) {
err = dsa_switch_do_mdb_add(ds, port, info->mdb);
if (err)
break;
}
}
return err;
}
static int dsa_switch_host_mdb_del(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
int err = 0;
int port;
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
for (port = 0; port < ds->num_ports; port++) {
if (dsa_switch_host_address_match(ds, port, info->sw_index,
info->port)) {
err = dsa_switch_do_mdb_del(ds, port, info->mdb);
if (err)
break;
}
}
return err;
}
static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
struct dsa_notifier_vlan_info *info)
{
if (ds->index == info->sw_index && port == info->port)
return true;
if (dsa_is_dsa_port(ds, port))
return true;
return false;
}
static int dsa_switch_vlan_add(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
int port, err;
if (!ds->ops->port_vlan_add)
return -EOPNOTSUPP;
for (port = 0; port < ds->num_ports; port++) {
if (dsa_switch_vlan_match(ds, port, info)) {
err = ds->ops->port_vlan_add(ds, port, 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)
{
if (!ds->ops->port_vlan_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_vlan_del(ds, info->port, info->vlan);
/* Do not deprogram the DSA links as they may be used as conduit
* for other VLAN members in the fabric.
*/
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;
int port, err;
if (!ds->ops->change_tag_protocol)
return -EOPNOTSUPP;
ASSERT_RTNL();
for (port = 0; port < ds->num_ports; port++) {
if (!dsa_is_cpu_port(ds, port))
continue;
err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto);
if (err)
return err;
dsa_port_set_tag_protocol(dsa_to_port(ds, port), 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.
*/
for (port = 0; port < ds->num_ports; port++) {
if (dsa_is_user_port(ds, port)) {
struct net_device *slave;
slave = dsa_to_port(ds, port)->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;
}
static int dsa_switch_mrp_add(struct dsa_switch *ds,
struct dsa_notifier_mrp_info *info)
{
if (!ds->ops->port_mrp_add)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_mrp_add(ds, info->port, info->mrp);
return 0;
}
static int dsa_switch_mrp_del(struct dsa_switch *ds,
struct dsa_notifier_mrp_info *info)
{
if (!ds->ops->port_mrp_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_mrp_del(ds, info->port, info->mrp);
return 0;
}
static int
dsa_switch_mrp_add_ring_role(struct dsa_switch *ds,
struct dsa_notifier_mrp_ring_role_info *info)
{
if (!ds->ops->port_mrp_add)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_mrp_add_ring_role(ds, info->port,
info->mrp);
return 0;
}
static int
dsa_switch_mrp_del_ring_role(struct dsa_switch *ds,
struct dsa_notifier_mrp_ring_role_info *info)
{
if (!ds->ops->port_mrp_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_mrp_del_ring_role(ds, info->port,
info->mrp);
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;
switch (event) {
case DSA_NOTIFIER_AGEING_TIME:
err = dsa_switch_ageing_time(ds, info);
break;
case DSA_NOTIFIER_BRIDGE_JOIN:
err = dsa_switch_bridge_join(ds, info);
break;
case DSA_NOTIFIER_BRIDGE_LEAVE:
err = dsa_switch_bridge_leave(ds, info);
break;
case DSA_NOTIFIER_FDB_ADD:
err = dsa_switch_fdb_add(ds, info);
break;
case DSA_NOTIFIER_FDB_DEL:
err = dsa_switch_fdb_del(ds, info);
break;
case DSA_NOTIFIER_HOST_FDB_ADD:
err = dsa_switch_host_fdb_add(ds, info);
break;
case DSA_NOTIFIER_HOST_FDB_DEL:
err = dsa_switch_host_fdb_del(ds, info);
break;
case DSA_NOTIFIER_HSR_JOIN:
err = dsa_switch_hsr_join(ds, info);
break;
case DSA_NOTIFIER_HSR_LEAVE:
err = dsa_switch_hsr_leave(ds, info);
break;
case DSA_NOTIFIER_LAG_CHANGE:
err = dsa_switch_lag_change(ds, info);
break;
case DSA_NOTIFIER_LAG_JOIN:
err = dsa_switch_lag_join(ds, info);
break;
case DSA_NOTIFIER_LAG_LEAVE:
err = dsa_switch_lag_leave(ds, info);
break;
case DSA_NOTIFIER_MDB_ADD:
err = dsa_switch_mdb_add(ds, info);
break;
case DSA_NOTIFIER_MDB_DEL:
err = dsa_switch_mdb_del(ds, info);
break;
case DSA_NOTIFIER_HOST_MDB_ADD:
err = dsa_switch_host_mdb_add(ds, info);
break;
case DSA_NOTIFIER_HOST_MDB_DEL:
err = dsa_switch_host_mdb_del(ds, info);
break;
case DSA_NOTIFIER_VLAN_ADD:
err = dsa_switch_vlan_add(ds, info);
break;
case DSA_NOTIFIER_VLAN_DEL:
err = dsa_switch_vlan_del(ds, info);
break;
case DSA_NOTIFIER_MTU:
err = dsa_switch_mtu(ds, info);
break;
case DSA_NOTIFIER_TAG_PROTO:
err = dsa_switch_change_tag_proto(ds, info);
break;
case DSA_NOTIFIER_MRP_ADD:
err = dsa_switch_mrp_add(ds, info);
break;
case DSA_NOTIFIER_MRP_DEL:
err = dsa_switch_mrp_del(ds, info);
break;
case DSA_NOTIFIER_MRP_ADD_RING_ROLE:
err = dsa_switch_mrp_add_ring_role(ds, info);
break;
case DSA_NOTIFIER_MRP_DEL_RING_ROLE:
err = dsa_switch_mrp_del_ring_role(ds, info);
break;
default:
err = -EOPNOTSUPP;
break;
}
if (err)
dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
event, err);
return notifier_from_errno(err);
}
int dsa_switch_register_notifier(struct dsa_switch *ds)
{
ds->nb.notifier_call = dsa_switch_event;
return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
}
void dsa_switch_unregister_notifier(struct dsa_switch *ds)
{
int err;
err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
if (err)
dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
}