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net: dsa: add cross-chip multicast support

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Similarly to how cross-chip VLAN works, define a bitmap of multicast
group members for a switch, now including its DSA ports, so that
multicast traffic can be sent to all switches of the fabric.

A switch may drop the frames if no user port is a member.

This brings support for multicast in a multi-chip environment.
As of now, all switches of the fabric must support the multicast
operations in order to program a single fabric port.

Reported-by: Jason Cobham <jcobham@questertangent.com>
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: Jason Cobham <jcobham@questertangent.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-06-15 16:14:48 -04:00 committed by David S. Miller
parent 6a2fb0e99f
commit a1a6b7ea7f
1 changed files with 20 additions and 10 deletions
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30
net/dsa/switch.c
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@ -122,19 +122,30 @@ static int dsa_switch_mdb_add(struct dsa_switch *ds,
{
const struct switchdev_obj_port_mdb *mdb = info->mdb;
struct switchdev_trans *trans = info->trans;
DECLARE_BITMAP(group, ds->num_ports);
int port, err;
/* Do not care yet about other switch chips of the fabric */
if (ds->index != info->sw_index)
return 0;
/* Build a mask of Multicast group members */
bitmap_zero(group, ds->num_ports);
if (ds->index == info->sw_index)
set_bit(info->port, group);
for (port = 0; port < ds->num_ports; port++)
if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
set_bit(port, group);
if (switchdev_trans_ph_prepare(trans)) {
if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
return -EOPNOTSUPP;
return ds->ops->port_mdb_prepare(ds, info->port, mdb, trans);
for_each_set_bit(port, group, ds->num_ports) {
err = ds->ops->port_mdb_prepare(ds, port, mdb, trans);
if (err)
return err;
}
}
ds->ops->port_mdb_add(ds, info->port, mdb, trans);
for_each_set_bit(port, group, ds->num_ports)
ds->ops->port_mdb_add(ds, port, mdb, trans);
return 0;
}
@ -144,14 +155,13 @@ static int dsa_switch_mdb_del(struct dsa_switch *ds,
{
const struct switchdev_obj_port_mdb *mdb = info->mdb;
/* Do not care yet about other switch chips of the fabric */
if (ds->index != info->sw_index)
return 0;
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
return ds->ops->port_mdb_del(ds, info->port, mdb);
if (ds->index == info->sw_index)
return ds->ops->port_mdb_del(ds, info->port, mdb);
return 0;
}
static int dsa_switch_vlan_add(struct dsa_switch *ds,