net: bridge: mst: Notify switchdev drivers of MST state changes

Generate a switchdev notification whenever an MST state changes. This
notification is keyed by the VLANs MSTI rather than the VID, since
multiple VLANs may share the same MST instance.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 53dfa0f..aa0171d 100644 (file)
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -19,6 +19,7 @@
 enum switchdev_attr_id {
        SWITCHDEV_ATTR_ID_UNDEFINED,
        SWITCHDEV_ATTR_ID_PORT_STP_STATE,
+       SWITCHDEV_ATTR_ID_PORT_MST_STATE,
        SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
        SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
        SWITCHDEV_ATTR_ID_PORT_MROUTER,
@@ -32,6 +33,11 @@ enum switchdev_attr_id {
        SWITCHDEV_ATTR_ID_VLAN_MSTI,
 };
 
+struct switchdev_mst_state {
+       u16 msti;
+       u8 state;
+};
+
 struct switchdev_brport_flags {
        unsigned long val;
        unsigned long mask;
@@ -50,6 +56,7 @@ struct switchdev_attr {
        void (*complete)(struct net_device *dev, int err, void *priv);
        union {
                u8 stp_state;                           /* PORT_STP_STATE */
+               struct switchdev_mst_state mst_state;   /* PORT_MST_STATE */
                struct switchdev_brport_flags brport_flags; /* PORT_BRIDGE_FLAGS */
                bool mrouter;                           /* PORT_MROUTER */
                clock_t ageing_time;                    /* BRIDGE_AGEING_TIME */

diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c
index 2926617..00935a1 100644 (file)
--- a/net/bridge/br_mst.c
+++ b/net/bridge/br_mst.c
@@ -30,13 +30,31 @@ static void br_mst_vlan_set_state(struct net_bridge_port *p, struct net_bridge_v
 int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,
                     struct netlink_ext_ack *extack)
 {
+       struct switchdev_attr attr = {
+               .id = SWITCHDEV_ATTR_ID_PORT_MST_STATE,
+               .orig_dev = p->dev,
+               .u.mst_state = {
+                       .msti = msti,
+                       .state = state,
+               },
+       };
        struct net_bridge_vlan_group *vg;
        struct net_bridge_vlan *v;
+       int err;
 
        vg = nbp_vlan_group(p);
        if (!vg)
                return 0;
 
+       /* MSTI 0 (CST) state changes are notified via the regular
+        * SWITCHDEV_ATTR_ID_PORT_STP_STATE.
+        */
+       if (msti) {
+               err = switchdev_port_attr_set(p->dev, &attr, extack);
+               if (err && err != -EOPNOTSUPP)
+                       return err;
+       }
+
        list_for_each_entry(v, &vg->vlan_list, vlist) {
                if (v->brvlan->msti != msti)
                        continue;