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linux/net/dsa/switch.c
Florian Fainelli 061f6a505a net: dsa: Add ndo_vlan_rx_{add, kill}_vid implementation 
In order to properly support VLAN filtering being enabled/disabled on a
bridge, while having other ports being non bridge port members, we need
to support the ndo_vlan_rx_{add,kill}_vid callbacks in order to make
sure the non-bridge ports can continue receiving VLAN tags, even when
the switch is globally configured to do ingress/egress VID checking.

Since we can call dsa_port_vlan_{add,del} with a bridge_dev pointer
NULL, we now need to check that in these two functions.

We specifically deal with two possibly problematic cases:

- creating a bridge VLAN entry while there is an existing VLAN device
  claiming that same VID

- creating a VLAN device while there is an existing bridge VLAN entry
  with that VID

Those are both resolved with returning -EBUSY back to user-space.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-02-22 11:53:32 -08:00

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/*
* Handling of a single switch chip, part of a switch fabric
*
* Copyright (c) 2017 Savoir-faire Linux Inc.
* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#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 = &ds->ports[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;
struct switchdev_trans *trans = info->trans;
if (switchdev_trans_ph_prepare(trans)) {
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;
return 0;
}
/* 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 int dsa_switch_bridge_join(struct dsa_switch *ds,
struct dsa_notifier_bridge_info *info)
{
if (ds->index == info->sw_index && ds->ops->port_bridge_join)
return ds->ops->port_bridge_join(ds, info->port, info->br);
if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
return ds->ops->crosschip_bridge_join(ds, 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)
{
if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
ds->ops->port_bridge_leave(ds, info->port, info->br);
if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
info->br);
return 0;
}
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 ds->ops->port_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 ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
}
static int
dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
const struct switchdev_obj_port_mdb *mdb,
const unsigned long *bitmap)
{
int port, err;
if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
return -EOPNOTSUPP;
for_each_set_bit(port, bitmap, ds->num_ports) {
err = ds->ops->port_mdb_prepare(ds, port, mdb);
if (err)
return err;
}
return 0;
}
static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
const struct switchdev_obj_port_mdb *mdb,
const unsigned long *bitmap)
{
int port;
for_each_set_bit(port, bitmap, ds->num_ports)
ds->ops->port_mdb_add(ds, port, mdb);
}
static int dsa_switch_mdb_add(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
const struct switchdev_obj_port_mdb *mdb = info->mdb;
struct switchdev_trans *trans = info->trans;
int port;
/* Build a mask of Multicast group members */
bitmap_zero(ds->bitmap, ds->num_ports);
if (ds->index == info->sw_index)
set_bit(info->port, ds->bitmap);
for (port = 0; port < ds->num_ports; port++)
if (dsa_is_dsa_port(ds, port))
set_bit(port, ds->bitmap);
if (switchdev_trans_ph_prepare(trans))
return dsa_switch_mdb_prepare_bitmap(ds, mdb, ds->bitmap);
dsa_switch_mdb_add_bitmap(ds, mdb, ds->bitmap);
return 0;
}
static int dsa_switch_mdb_del(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
const struct switchdev_obj_port_mdb *mdb = info->mdb;
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_mdb_del(ds, info->port, mdb);
return 0;
}
static int dsa_port_vlan_device_check(struct net_device *vlan_dev,
int vlan_dev_vid,
void *arg)
{
struct switchdev_obj_port_vlan *vlan = arg;
u16 vid;
for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
if (vid == vlan_dev_vid)
return -EBUSY;
}
return 0;
}
static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan)
{
const struct dsa_port *dp = dsa_to_port(ds, port);
int err = 0;
/* Device is not bridged, let it proceed with the VLAN device
* creation.
*/
if (!dp->bridge_dev)
return err;
/* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare pharse and
* already checks whether there is an overlapping bridge VLAN entry
* with the same VID, so here we only need to check that if we are
* adding a bridge VLAN entry there is not an overlapping VLAN device
* claiming that VID.
*/
return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
(void *)vlan);
}
static int
dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
const struct switchdev_obj_port_vlan *vlan,
const unsigned long *bitmap)
{
int port, err;
if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
return -EOPNOTSUPP;
for_each_set_bit(port, bitmap, ds->num_ports) {
err = dsa_port_vlan_check(ds, port, vlan);
if (err)
return err;
err = ds->ops->port_vlan_prepare(ds, port, vlan);
if (err)
return err;
}
return 0;
}
static void
dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
const struct switchdev_obj_port_vlan *vlan,
const unsigned long *bitmap)
{
int port;
for_each_set_bit(port, bitmap, ds->num_ports)
ds->ops->port_vlan_add(ds, port, vlan);
}
static int dsa_switch_vlan_add(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
const struct switchdev_obj_port_vlan *vlan = info->vlan;
struct switchdev_trans *trans = info->trans;
int port;
/* Build a mask of VLAN members */
bitmap_zero(ds->bitmap, ds->num_ports);
if (ds->index == info->sw_index)
set_bit(info->port, ds->bitmap);
for (port = 0; port < ds->num_ports; port++)
if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
set_bit(port, ds->bitmap);
if (switchdev_trans_ph_prepare(trans))
return dsa_switch_vlan_prepare_bitmap(ds, vlan, ds->bitmap);
dsa_switch_vlan_add_bitmap(ds, vlan, ds->bitmap);
return 0;
}
static int dsa_switch_vlan_del(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
const struct switchdev_obj_port_vlan *vlan = info->vlan;
if (!ds->ops->port_vlan_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
return ds->ops->port_vlan_del(ds, info->port, vlan);
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_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_VLAN_ADD:
err = dsa_switch_vlan_add(ds, info);
break;
case DSA_NOTIFIER_VLAN_DEL:
err = dsa_switch_vlan_del(ds, info);
break;
default:
err = -EOPNOTSUPP;
break;
}
/* Non-switchdev operations cannot be rolled back. If a DSA driver
* returns an error during the chained call, switch chips may be in an
* inconsistent state.
*/
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);
}
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