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Commit a1a6b7ea authored by Vivien Didelot's avatar Vivien Didelot Committed by David S. Miller
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net: dsa: add cross-chip multicast support 



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: default avatarJason Cobham <jcobham@questertangent.com>
Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: default avatarJason Cobham <jcobham@questertangent.com>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6a2fb0e9

net/dsa/switch.c

+20 −10
Original line number Diff line number Diff line
@@ -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;



	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,