[PATCH 8/9] net: bridge: mcast: track active state, bridge up/down

["Linus Lüssing" <linus.luessing@c0d3.blue>]

This is mainly for switchdev and DSA later: To ensure that we switch
to inactive before destroying a bridge interface. A switchdev/DSA driver
might have allocated resources after we switched to an enabled multicast
active state. This gives switchdev/DSA drivers a chance to free these
resources again when we destroy the bridge (later).

Putting it into the ndo_stop / bridge interface down part instead of the
ndo_uninit / bridge destroy part though for a better semantic match. If
the bridge interface is down / stopped then it is also inactive.

No functional change for the fast/data path.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
 include/uapi/linux/if_link.h |  8 ++++----
 net/bridge/br_device.c       |  3 +++
 net/bridge/br_multicast.c    | 26 ++++++++++++++++++++++----
 3 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index ef686ea17afe..76d15a07344d 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -746,14 +746,14 @@ enum in6_addr_gen_mode {
  * @IFLA_BR_MCAST_ACTIVE_V4
  *   Bridge IPv4 mcast active state, read only.
  *
- *   1 if *IFLA_BR_MCAST_SNOOPING* is enabled and an IGMP querier is present,
- *   0 otherwise.
+ *   1 if *IFLA_BR_MCAST_SNOOPING* is enabled, an IGMP querier is present
+ *   and the bridge interface is up, 0 otherwise.
  *
  * @IFLA_BR_MCAST_ACTIVE_V6
  *   Bridge IPv6 mcast active state, read only.
  *
- *   1 if *IFLA_BR_MCAST_SNOOPING* is enabled and an MLD querier is present,
- *   0 otherwise.
+ *   1 if *IFLA_BR_MCAST_SNOOPING* is enabled, an MLD querier is present
+ *   and the bridge interface is up, 0 otherwise.
  */
 enum {
 	IFLA_BR_UNSPEC,
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 3cdf1c17108b..efb5d35c2dd4 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -168,7 +168,10 @@ static int br_dev_open(struct net_device *dev)
 	netdev_update_features(dev);
 	netif_start_queue(dev);
 	br_stp_enable_bridge(br);
+
+	spin_lock_bh(&br->multicast_lock);
 	br_multicast_open(br);
+	spin_unlock_bh(&br->multicast_lock);
 
 	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
 		br_multicast_join_snoopers(br);
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 53720337a1e3..09e23e4d8b74 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1145,6 +1145,7 @@ static void br_ip6_multicast_update_active(struct net_bridge_mcast *brmctx,
  *
  * The multicast active state is set, per protocol family, if:
  *
+ * - the bridge interface is up
  * - multicast snooping is enabled
  * - an IGMP/MLD querier is present
  * - for own IPv6 MLD querier: an IPv6 address is configured on the bridge
@@ -1160,6 +1161,9 @@ static void br_multicast_update_active(struct net_bridge_mcast *brmctx)
 
 	lockdep_assert_held_once(&brmctx->br->multicast_lock);
 
+	if (!netif_running(brmctx->br->dev))
+		force_inactive = true;
+
 	if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
 		force_inactive = true;
 
@@ -4379,6 +4383,9 @@ static void __br_multicast_open(struct net_bridge_mcast *brmctx)
 #if IS_ENABLED(CONFIG_IPV6)
 	__br_multicast_open_query(brmctx->br, &brmctx->ip6_own_query);
 #endif
+
+	/* bridge interface is up, maybe set multicast state to active */
+	br_multicast_update_active(brmctx);
 }
 
 void br_multicast_open(struct net_bridge *br)
@@ -4417,6 +4424,11 @@ static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
 	timer_delete_sync(&brmctx->ip6_other_query.delay_timer);
 	timer_delete_sync(&brmctx->ip6_own_query.timer);
 #endif
+
+	spin_lock_bh(&brmctx->br->multicast_lock);
+	/* bridge interface is down, set multicast state to inactive */
+	br_multicast_update_active(brmctx);
+	spin_unlock_bh(&brmctx->br->multicast_lock);
 }
 
 void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state)
@@ -4469,10 +4481,13 @@ void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
 		br_multicast_update_active(&vlan->br_mcast_ctx);
 		spin_unlock_bh(&br->multicast_lock);
 
-		if (on)
+		if (on) {
+			spin_lock_bh(&br->multicast_lock);
 			__br_multicast_open(&vlan->br_mcast_ctx);
-		else
+			spin_unlock_bh(&br->multicast_lock);
+		} else {
 			__br_multicast_stop(&vlan->br_mcast_ctx);
+		}
 	} else {
 		struct net_bridge_mcast *brmctx;
 
@@ -4534,10 +4549,13 @@ int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
 	br_opt_toggle(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED, on);
 
 	/* disable/enable non-vlan mcast contexts based on vlan snooping */
-	if (on)
+	if (on) {
 		__br_multicast_stop(&br->multicast_ctx);
-	else
+	} else {
+		spin_lock_bh(&br->multicast_lock);
 		__br_multicast_open(&br->multicast_ctx);
+		spin_unlock_bh(&br->multicast_lock);
+	}
 	list_for_each_entry(p, &br->port_list, list) {
 		if (on)
 			br_multicast_disable_port_ctx(&p->multicast_ctx);
-- 
2.50.1