From f54fd0e163068ced4d0d27db64cd3cbda95b74e4 Mon Sep 17 00:00:00 2001 From: Tobias Waldekranz Date: Wed, 16 Mar 2022 16:08:51 +0100 Subject: net: bridge: mst: Add helper to query a port's MST state This is useful for switchdev drivers who are offloading MST states into hardware. As an example, a driver may wish to flush the FDB for a port when it transitions from forwarding to blocking - which means that the previous state must be discoverable. Signed-off-by: Tobias Waldekranz Reviewed-by: Vladimir Oltean Acked-by: Nikolay Aleksandrov Signed-off-by: Jakub Kicinski --- net/bridge/br_mst.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'net/bridge/br_mst.c') diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c index 830a5746479f..ee680adcee17 100644 --- a/net/bridge/br_mst.c +++ b/net/bridge/br_mst.c @@ -48,6 +48,31 @@ int br_mst_get_info(const struct net_device *dev, u16 msti, unsigned long *vids) } EXPORT_SYMBOL_GPL(br_mst_get_info); +int br_mst_get_state(const struct net_device *dev, u16 msti, u8 *state) +{ + const struct net_bridge_port *p = NULL; + const struct net_bridge_vlan_group *vg; + const struct net_bridge_vlan *v; + + ASSERT_RTNL(); + + p = br_port_get_check_rtnl(dev); + if (!p || !br_opt_get(p->br, BROPT_MST_ENABLED)) + return -EINVAL; + + vg = nbp_vlan_group(p); + + list_for_each_entry(v, &vg->vlan_list, vlist) { + if (v->brvlan->msti == msti) { + *state = v->state; + return 0; + } + } + + return -ENOENT; +} +EXPORT_SYMBOL_GPL(br_mst_get_state); + static void br_mst_vlan_set_state(struct net_bridge_port *p, struct net_bridge_vlan *v, u8 state) { -- cgit