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net: dsa: Validate hardware support for MST

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When joining a bridge where MST is enabled, we validate that the
proper offloading support is in place, otherwise we fallback to
software bridging.

When then mode is changed on a bridge in which we are members, we
refuse the change if offloading is not supported.

At the moment we only check for configurable learning, but this will
be further restricted as we support more MST related switchdev events.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tobias Waldekranz
2022-03-16 16:08:52 +01:00
committed by Jakub Kicinski
parent f54fd0e163
commit 332afc4c8c
3 changed files with 30 additions and 0 deletions
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6
net/dsa/slave.c
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@@ -464,6 +464,12 @@ static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
break;
case SWITCHDEV_ATTR_ID_BRIDGE_MST:
if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
return -EOPNOTSUPP;
ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
break;
case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
return -EOPNOTSUPP;