[PATCH net-next 8/9] mlxsw: Add QinQ configuration vetoes

Ido Schimmel
2020-11-29T12:56:22Z

From: Danielle Ratson <danieller@nvidia.com>

After adding support for QinQ, a.k.a 802.1ad protocol, there are a few
scenarios that should be vetoed.

The vetoes are motivated by various ASIC limitations.
For example, a port that is member in a 802.1ad bridge cannot have 802.1q
uppers as the port needs to be configured to treat 802.1q packets as
untagged packets.

Veto all those unsupported scenarios and return suitable messages.

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---
.../net/ethernet/mellanox/mlxsw/spectrum.c | 44 +++++++++++++++++++
.../ethernet/mellanox/mlxsw/spectrum_router.c | 9 ++++
.../mellanox/mlxsw/spectrum_switchdev.c | 24 ++++++++++
3 files changed, 77 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index fe954e87c5a7..385eb3c3b362 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3893,6 +3893,7 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *lower_dev,
struct net_device *upper_dev;
struct mlxsw_sp *mlxsw_sp;
int err = 0;
+ u16 proto;

mlxsw_sp_port = netdev_priv(dev);
mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
@@ -3950,6 +3951,36 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *lower_dev,
NL_SET_ERR_MSG_MOD(extack, "Can not put a VLAN on an OVS port");
return -EINVAL;
}
+ if (netif_is_bridge_master(upper_dev)) {
+ br_vlan_get_proto(upper_dev, &proto);
+ if (br_vlan_enabled(upper_dev) &&
+ proto != ETH_P_8021Q && proto != ETH_P_8021AD) {
+ NL_SET_ERR_MSG_MOD(extack, "Enslaving a port to a bridge with unknown VLAN protocol is not supported");
+ return -EOPNOTSUPP;
+ }
+ if (vlan_uses_dev(lower_dev) &&
+ br_vlan_enabled(upper_dev) &&
+ proto == ETH_P_8021AD) {
+ NL_SET_ERR_MSG_MOD(extack, "Enslaving a port that already has a VLAN upper to an 802.1ad bridge is not supported");
+ return -EOPNOTSUPP;
+ }
+ }
+ if (netif_is_bridge_port(lower_dev) && is_vlan_dev(upper_dev)) {
+ struct net_device *br_dev = netdev_master_upper_dev_get(lower_dev);
+
+ if (br_vlan_enabled(br_dev)) {
+ br_vlan_get_proto(br_dev, &proto);
+ if (proto == ETH_P_8021AD) {
+ NL_SET_ERR_MSG_MOD(extack, "VLAN uppers are not supported on a port enslaved to an 802.1ad bridge");
+ return -EOPNOTSUPP;
+ }
+ }
+ }
+ if (is_vlan_dev(upper_dev) &&
+ ntohs(vlan_dev_vlan_proto(upper_dev)) != ETH_P_8021Q) {
+ NL_SET_ERR_MSG_MOD(extack, "VLAN uppers are only supported with 802.1q VLAN protocol");
+ return -EOPNOTSUPP;
+ }
break;
case NETDEV_CHANGEUPPER:
upper_dev = info->upper_dev;
@@ -4215,6 +4246,7 @@ static int mlxsw_sp_netdevice_bridge_event(struct net_device *br_dev,
struct netdev_notifier_changeupper_info *info = ptr;
struct netlink_ext_ack *extack;
struct net_device *upper_dev;
+ u16 proto;

if (!mlxsw_sp)
return 0;
@@ -4230,6 +4262,18 @@ static int mlxsw_sp_netdevice_bridge_event(struct net_device *br_dev,
}
if (!info->linking)
break;
+ if (br_vlan_enabled(br_dev)) {
+ br_vlan_get_proto(br_dev, &proto);
+ if (proto == ETH_P_8021AD) {
+ NL_SET_ERR_MSG_MOD(extack, "Uppers are not supported on top of an 802.1ad bridge");
+ return -EOPNOTSUPP;
+ }
+ }
+ if (is_vlan_dev(upper_dev) &&
+ ntohs(vlan_dev_vlan_proto(upper_dev)) != ETH_P_8021Q) {
+ NL_SET_ERR_MSG_MOD(extack, "VLAN uppers are only supported with 802.1q VLAN protocol");
+ return -EOPNOTSUPP;
+ }
if (netif_is_macvlan(upper_dev) &&
!mlxsw_sp_rif_exists(mlxsw_sp, br_dev)) {
NL_SET_ERR_MSG_MOD(extack, "macvlan is only supported on top of router interfaces");
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 12b5d7fbe1e2..85223647fdb6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -7857,6 +7857,15 @@ static int mlxsw_sp_inetaddr_bridge_event(struct mlxsw_sp *mlxsw_sp,

switch (event) {
case NETDEV_UP:
+ if (netif_is_bridge_master(l3_dev) && br_vlan_enabled(l3_dev)) {
+ u16 proto;
+
+ br_vlan_get_proto(l3_dev, &proto);
+ if (proto == ETH_P_8021AD) {
+ NL_SET_ERR_MSG_MOD(extack, "Adding an IP address to 802.1ad bridge is not supported");
+ return -EOPNOTSUPP;
+ }
+ }
rif = mlxsw_sp_rif_create(mlxsw_sp, &params, extack);
if (IS_ERR(rif))
return PTR_ERR(rif);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index d8ee8801331c..9c4e17607e6a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -764,6 +764,25 @@ static int mlxsw_sp_port_attr_br_vlan_set(struct mlxsw_sp_port *mlxsw_sp_port,
return -EINVAL;
}

+static int mlxsw_sp_port_attr_br_vlan_proto_set(struct mlxsw_sp_port *mlxsw_sp_port,
+ struct switchdev_trans *trans,
+ struct net_device *orig_dev,
+ u16 vlan_proto)
+{
+ struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+ struct mlxsw_sp_bridge_device *bridge_device;
+
+ if (!switchdev_trans_ph_prepare(trans))
+ return 0;
+
+ bridge_device = mlxsw_sp_bridge_device_find(mlxsw_sp->bridge, orig_dev);
+ if (WARN_ON(!bridge_device))
+ return -EINVAL;
+
+ netdev_err(bridge_device->dev, "VLAN protocol can't be changed on existing bridge\n");
+ return -EINVAL;
+}
+
static int mlxsw_sp_port_attr_mrouter_set(struct mlxsw_sp_port *mlxsw_sp_port,
struct switchdev_trans *trans,
struct net_device *orig_dev,
@@ -933,6 +952,11 @@ static int mlxsw_sp_port_attr_set(struct net_device *dev,
attr->orig_dev,
attr->u.vlan_filtering);
break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL:
+ err = mlxsw_sp_port_attr_br_vlan_proto_set(mlxsw_sp_port, trans,
+ attr->orig_dev,
+ attr->u.vlan_protocol);
+ break;
case SWITCHDEV_ATTR_ID_PORT_MROUTER:
err = mlxsw_sp_port_attr_mrouter_set(mlxsw_sp_port, trans,
attr->orig_dev,
--
2.28.0