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net: dsa: add support for BRIDGE_MROUTER attribute

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This patch adds support for enabling or disabling the flooding of
unknown multicast traffic on the CPU ports, depending on the value
of the switchdev SWITCHDEV_ATTR_ID_BRIDGE_MROUTER attribute.

The current behavior is kept unchanged but a user can now prevent
the CPU conduit to be flooded with a lot of unregistered traffic that
the network stack needs to filter in software with e.g.:

    echo 0 > /sys/class/net/br0/multicast_router

Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2019-07-08 23:31:13 -04:00 committed by David S. Miller
parent fbc697796e
commit 08cc83cc7f
3 changed files with 17 additions and 0 deletions
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2
net/dsa/dsa_priv.h
View File

@ -150,6 +150,8 @@ int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
struct switchdev_trans *trans);
int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
struct switchdev_trans *trans);
int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
struct switchdev_trans *trans);
int dsa_port_vlan_add(struct dsa_port *dp,
const struct switchdev_obj_port_vlan *vlan,
struct switchdev_trans *trans);

12
net/dsa/port.c
View File

@ -261,6 +261,18 @@ int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
return err;
}
int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
struct switchdev_trans *trans)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
if (switchdev_trans_ph_prepare(trans))
return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP;
return ds->ops->port_egress_floods(ds, port, true, mrouter);
}
int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
u16 vid)
{

3
net/dsa/slave.c
View File

@ -301,6 +301,9 @@ static int dsa_slave_port_attr_set(struct net_device *dev,
case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
break;
case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
break;
default:
ret = -EOPNOTSUPP;
break;