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net: bridge: mst: Add helper to query a port's MST state

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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 <tobias@waldekranz.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tobias Waldekranz
2022-03-16 16:08:51 +01:00
committed by Jakub Kicinski
parent 48d57b2e5f
commit f54fd0e163
2 changed files with 31 additions and 0 deletions
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25
net/bridge/br_mst.c
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@@ -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)
{