bridge: multicast: per vlan query improvement when port or vlan state changes

PATCH Applied Petr Machata 4 participants 10 messages Apr 17, 2025 – Apr 23, 2025

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Networking Network drivers Kselftest IPv4/IPv6 +1 more subsystems

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Petr Machata

author

2025-04-17 13:44 UTC #0 lore raw

cover bridge: multicast: per vlan query improvement when port or vlan state changes

From: Yong Wang <[email protected]>

The current implementation of br_multicast_enable_port() only operates on port's multicast context, which doesn't take into account in case of vlan snooping, one downside is the port's igmp query timer will NOT resume when port state gets changed from BR_STATE_BLOCKING to BR_STATE_FORWARDING etc.

Such code flow will briefly look like:
1.vlan snooping
--> br_multicast_port_query_expired with per vlan port_mcast_ctx --> port in BR_STATE_BLOCKING state --> then one-shot timer discontinued

The port state could be changed by STP daemon or kernel STP, taking mstpd as example:

2.mstpd --> netlink_sendmsg --> br_setlink --> br_set_port_state with non
blocking states, i.e. BR_STATE_LEARNING or BR_STATE_FORWARDING --> br_port_state_selection --> br_multicast_enable_port --> enable multicast with port's multicast_ctx

Here for per vlan snooping, the vlan context of the port should be used instead of port's multicast_ctx. The first patch corrects such behavior.

Similarly, vlan state change also impacts multicast behavior, the 2nd patch adds function to update the corresponding multicast context when vlan state changes.

The 3rd patch adds the selftests to confirm that IGMP/MLD query does happen when the STP state becomes forwarding.

Yong Wang (3):
net: bridge: mcast: re-implement br_multicast_{enable, disable}_port
functions
net: bridge: mcast: update multicast contex when vlan state is changed
selftests: net/bridge : add tests for per vlan snooping with stp state
changes

 net/bridge/br_mst.c                           |   4 +-
 net/bridge/br_multicast.c                     | 103 ++++++++++++++++--
 net/bridge/br_private.h                       |  11 +-
 .../selftests/net/forwarding/bridge_igmp.sh   |  80 +++++++++++++-
 .../selftests/net/forwarding/bridge_mld.sh    |  81 +++++++++++++-
 tools/testing/selftests/net/forwarding/config |   1 +
 6 files changed, 261 insertions(+), 19 deletions(-)

Signature · 1 line

2.49.0

Petr Machata

author

2025-04-17 13:44 UTC #1 lore raw

PATCH 1/3 net: bridge: mcast: re-implement br_multicast_{enable, disable}_port functions

From: Yong Wang <[email protected]>

When a bridge port STP state is changed from BLOCKING/DISABLED to FORWARDING, the port's igmp query timer will NOT re-arm itself if the bridge has been configured as per-VLAN multicast snooping.

Solve this by choosing the correct multicast context(s) to enable/disable port multicast based on whether per-VLAN multicast snooping is enabled or not, i.e. using per-{port, VLAN} context in case of per-VLAN multicast snooping by re-implementing br_multicast_enable_port() and br_multicast_disable_port() functions.

Before the patch, the IGMP query does not happen in the last step of the following test sequence, i.e. no growth for tx counter:

 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # bridge link set dev swp1 state 0
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge link set dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1

After the patch, the IGMP query happens in the last step of the test:

 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # bridge link set dev swp1 state 0
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge link set dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
3

Signed-off-by Yong Wang <[email protected]>

Reviewed-by Andy Roulin <[email protected]>

Reviewed-by Ido Schimmel <[email protected]>

Signed-off-by Petr Machata <[email protected]>

---
 net/bridge/br_multicast.c | 77 +++++++++++++++++++++++++++++++++++----
 1 file changed, 69 insertions(+), 8 deletions(-)

net/bridge/br_multicast.c +69 -8

index dcbf058de1e3..ce07fda6a848 100644
@@ -2105,12 +2105,17 @@ static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
 	}
 }
 
-void br_multicast_enable_port(struct net_bridge_port *port)
+static void br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
 {
-	struct net_bridge *br = port->br;
+	struct net_bridge *br = pmctx->port->br;
 
 	spin_lock_bh(&br->multicast_lock);
-	__br_multicast_enable_port_ctx(&port->multicast_ctx);
+	if (br_multicast_port_ctx_is_vlan(pmctx) &&
+	    !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) {
+		spin_unlock_bh(&br->multicast_lock);
+		return;
+	}
+	__br_multicast_enable_port_ctx(pmctx);
 	spin_unlock_bh(&br->multicast_lock);
 }

@@ -2137,11 +2142,67 @@ static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
 	br_multicast_rport_del_notify(pmctx, del);
 }
 
+static void br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
+{
+	struct net_bridge *br = pmctx->port->br;
+
+	spin_lock_bh(&br->multicast_lock);
+	if (br_multicast_port_ctx_is_vlan(pmctx) &&
+	    !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) {
+		spin_unlock_bh(&br->multicast_lock);
+		return;
+	}
+
+	__br_multicast_disable_port_ctx(pmctx);
+	spin_unlock_bh(&br->multicast_lock);
+}
+
+static void br_multicast_toggle_port(struct net_bridge_port *port, bool on)
+{
+#if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
+	if (br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
+		struct net_bridge_vlan_group *vg;
+		struct net_bridge_vlan *vlan;
+
+		rcu_read_lock();
+		vg = nbp_vlan_group_rcu(port);
+		if (!vg) {
+			rcu_read_unlock();
+			return;
+		}
+
+		/* iterate each vlan, toggle vlan multicast context */
+		list_for_each_entry_rcu(vlan, &vg->vlan_list, vlist) {
+			struct net_bridge_mcast_port *pmctx =
+						&vlan->port_mcast_ctx;
+			u8 state = br_vlan_get_state(vlan);
+			/* enable vlan multicast context when state is
+			 * LEARNING or FORWARDING
+			 */
+			if (on && br_vlan_state_allowed(state, true))
+				br_multicast_enable_port_ctx(pmctx);
+			else
+				br_multicast_disable_port_ctx(pmctx);
+		}
+		rcu_read_unlock();
+		return;
+	}
+#endif
+	/* toggle port multicast context when vlan snooping is disabled */
+	if (on)
+		br_multicast_enable_port_ctx(&port->multicast_ctx);
+	else
+		br_multicast_disable_port_ctx(&port->multicast_ctx);
+}
+
+void br_multicast_enable_port(struct net_bridge_port *port)
+{
+	br_multicast_toggle_port(port, true);
+}
+
 void br_multicast_disable_port(struct net_bridge_port *port)
 {
-	spin_lock_bh(&port->br->multicast_lock);
-	__br_multicast_disable_port_ctx(&port->multicast_ctx);
-	spin_unlock_bh(&port->br->multicast_lock);
+	br_multicast_toggle_port(port, false);
 }
 
 static int __grp_src_delete_marked(struct net_bridge_port_group *pg)

@@ -4304,9 +4365,9 @@ int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
 		__br_multicast_open(&br->multicast_ctx);
 	list_for_each_entry(p, &br->port_list, list) {
 		if (on)
-			br_multicast_disable_port(p);
+			br_multicast_disable_port_ctx(&p->multicast_ctx);
 		else
-			br_multicast_enable_port(p);
+			br_multicast_enable_port_ctx(&p->multicast_ctx);
 	}
 
 	list_for_each_entry(vlan, &vg->vlan_list, vlist)

Signature · 1 line

2.49.0

Nikolay Aleksandrov

maintainer Acked-by on v1 1/3

2025-04-19 06:38 UTC #2 lore raw

Re: [PATCH net-next 1/3] net: bridge: mcast: re-implement br_multicast_{enable, disable}_port functions

Quoted 43 lines · Petr Machata

From: Yong Wang <[email protected]>
When a bridge port STP state is changed from BLOCKING/DISABLED to FORWARDING, the port's igmp query timer will NOT re-arm itself if the bridge has been configured as per-VLAN multicast snooping.
Solve this by choosing the correct multicast context(s) to enable/disable port multicast based on whether per-VLAN multicast snooping is enabled or not, i.e. using per-{port, VLAN} context in case of per-VLAN multicast snooping by re-implementing br_multicast_enable_port() and br_multicast_disable_port() functions.
Before the patch, the IGMP query does not happen in the last step of the following test sequence, i.e. no growth for tx counter:
 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # bridge link set dev swp1 state 0
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge link set dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
After the patch, the IGMP query happens in the last step of the test:
 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # bridge link set dev swp1 state 0
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge link set dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
3

Quoted 8 lines

Signed-off-by Yong Wang <[email protected]>
Reviewed-by Andy Roulin <[email protected]>
Reviewed-by Ido Schimmel <[email protected]>
Signed-off-by Petr Machata <[email protected]>
---
 net/bridge/br_multicast.c | 77 +++++++++++++++++++++++++++++++++++----
 1 file changed, 69 insertions(+), 8 deletions(-)

I feel like I've seen a similar patch before. Are you sure this is not v2? :) Anyway looks good to me. Thanks!

Acked-by Nikolay Aleksandrov <[email protected]>

Yong Wang

2025-04-19 14:33 UTC #3 lore raw

Re: [PATCH net-next 1/3] net: bridge: mcast: re-implement br_multicast_{enable, disable}_port functions

Quoted 53 lines · Nikolay Aleksandrov

Quoted 43 lines · Petr Machata
From: Yong Wang <[email protected]>
When a bridge port STP state is changed from BLOCKING/DISABLED to FORWARDING, the port's igmp query timer will NOT re-arm itself if the bridge has been configured as per-VLAN multicast snooping.
Solve this by choosing the correct multicast context(s) to enable/disable port multicast based on whether per-VLAN multicast snooping is enabled or not, i.e. using per-{port, VLAN} context in case of per-VLAN multicast snooping by re-implementing br_multicast_enable_port() and br_multicast_disable_port() functions.
Before the patch, the IGMP query does not happen in the last step of the following test sequence, i.e. no growth for tx counter:
 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # bridge link set dev swp1 state 0
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge link set dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
After the patch, the IGMP query happens in the last step of the test:
 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # bridge link set dev swp1 state 0
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge link set dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
3
Quoted 8 lines
Signed-off-by Yong Wang <[email protected]>
Reviewed-by Andy Roulin <[email protected]>
Reviewed-by Ido Schimmel <[email protected]>
Signed-off-by Petr Machata <[email protected]>
---
 net/bridge/br_multicast.c | 77 +++++++++++++++++++++++++++++++++++----
 1 file changed, 69 insertions(+), 8 deletions(-)

Quoted 4 lines

I feel like I've seen a similar patch before. Are you sure this is not v2? :) Anyway looks good to me. Thanks!
Acked-by Nikolay Aleksandrov <[email protected]>

Yes, this should be V2. Petr is helping upstreaming this patch. Thanks for your acknowledgement.

Petr Machata

author

2025-04-22 12:26 UTC #4 lore raw

Re: [PATCH net-next 1/3] net: bridge: mcast: re-implement br_multicast_{enable, disable}_port functions

Quoted 7 lines · Yong Wang

Quoted 2 lines · Nikolay Aleksandrov
I feel like I've seen a similar patch before. Are you sure this is not v2? :) Anyway looks good to me. Thanks!
Yes, this should be V2. Petr is helping upstreaming this patch. Thanks for your acknowledgement.

Indeed, there were two RFCs and a v1 back in December. My bad, I forgot all about it.

Petr Machata

author

2025-04-17 13:44 UTC #5 lore raw

PATCH 2/3 net: bridge: mcast: update multicast contex when vlan state is changed

In reply to Petr Machata

From: Yong Wang <[email protected]>

When the vlan STP state is changed, which could be manipulated by "bridge vlan" commands, similar to port STP state, this also impacts multicast behaviors such as igmp query. In the scenario of per-VLAN snooping, there's a need to update the corresponding multicast context to re-arm the port query timer when vlan state becomes "forwarding" etc.

Update br_vlan_set_state() function to enable vlan multicast context in such scenario.

Before the patch, the IGMP query does not happen in the last step of the following test sequence, i.e. no growth for tx counter:

 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # sleep 1
 # bridge vlan set vid 1 dev swp1 state 4
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge vlan set vid 1 dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1

After the patch, the IGMP query happens in the last step of the test:

 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # sleep 1
 # bridge vlan set vid 1 dev swp1 state 4
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge vlan set vid 1 dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
3

Signed-off-by Yong Wang <[email protected]>

Reviewed-by Andy Roulin <[email protected]>

Reviewed-by Ido Schimmel <[email protected]>

Signed-off-by Petr Machata <[email protected]>

---
 net/bridge/br_mst.c       |  4 ++--
 net/bridge/br_multicast.c | 26 ++++++++++++++++++++++++++
 net/bridge/br_private.h   | 11 ++++++++++-
 3 files changed, 38 insertions(+), 3 deletions(-)

net/bridge/br_mst.c +2 -2

index 1820f09ff59c..3f24b4ee49c2 100644
@@ -80,10 +80,10 @@ static void br_mst_vlan_set_state(struct net_bridge_vlan_group *vg,
 	if (br_vlan_get_state(v) == state)
 		return;
 
-	br_vlan_set_state(v, state);
-
 	if (v->vid == vg->pvid)
 		br_vlan_set_pvid_state(vg, state);
+
+	br_vlan_set_state(v, state);
 }
 
 int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,

net/bridge/br_multicast.c +26 -0

index ce07fda6a848..7e0b2362b9ee 100644
@@ -4272,6 +4272,32 @@ static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
 #endif
 }
 
+void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state)
+{
+#if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
+	struct net_bridge *br;
+
+	if (!br_vlan_should_use(v))
+		return;
+
+	if (br_vlan_is_master(v))
+		return;
+
+	br = v->port->br;
+
+	if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
+		return;
+
+	if (br_vlan_state_allowed(state, true))
+		br_multicast_enable_port_ctx(&v->port_mcast_ctx);
+
+	/* Multicast is not disabled for the vlan when it goes in
+	 * blocking state because the timers will expire and stop by
+	 * themselves without sending more queries.
+	 */
+#endif
+}
+
 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
 {
 	struct net_bridge *br;

net/bridge/br_private.h +10 -1

index 71f351a6ce1b..db1bddb330ff 100644
@@ -1055,6 +1055,7 @@ void br_multicast_port_ctx_init(struct net_bridge_port *port,
 				struct net_bridge_vlan *vlan,
 				struct net_bridge_mcast_port *pmctx);
 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx);
+void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state);
 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on);
 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
 				      struct netlink_ext_ack *extack);

@@ -1521,6 +1522,11 @@ static inline void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pm
 {
 }
 
+static inline void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v,
+						      u8 state)
+{
+}
+
 static inline void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan,
 						bool on)
 {

@@ -1881,7 +1887,9 @@ bool br_vlan_global_opts_can_enter_range(const struct net_bridge_vlan *v_curr,
 bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
 			      const struct net_bridge_vlan *v_opts);
 
-/* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
+/* vlan state manipulation helpers using *_ONCE to annotate lock-free access,
+ * while br_vlan_set_state() may access data protected by multicast_lock.
+ */
 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
 {
 	return READ_ONCE(v->state);

@@ -1890,6 +1898,7 @@ static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
 {
 	WRITE_ONCE(v->state, state);
+	br_multicast_update_vlan_mcast_ctx(v, state);
 }
 
 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)

Signature · 1 line

2.49.0

Nikolay Aleksandrov

maintainer Acked-by on v1 2/3

2025-04-19 06:39 UTC #6 lore raw

Re: [PATCH net-next 2/3] net: bridge: mcast: update multicast contex when vlan state is changed

Quoted 48 lines · Petr Machata

From: Yong Wang <[email protected]>
When the vlan STP state is changed, which could be manipulated by "bridge vlan" commands, similar to port STP state, this also impacts multicast behaviors such as igmp query. In the scenario of per-VLAN snooping, there's a need to update the corresponding multicast context to re-arm the port query timer when vlan state becomes "forwarding" etc.
Update br_vlan_set_state() function to enable vlan multicast context in such scenario.
Before the patch, the IGMP query does not happen in the last step of the following test sequence, i.e. no growth for tx counter:
 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # sleep 1
 # bridge vlan set vid 1 dev swp1 state 4
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge vlan set vid 1 dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
After the patch, the IGMP query happens in the last step of the test:
 # ip link add name br1 up type bridge vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 mcast_querier 1 mcast_stats_enabled 1
 # bridge vlan global set vid 1 dev br1 mcast_snooping 1 mcast_querier 1 mcast_query_interval 100 mcast_startup_query_count 0
 # ip link add name swp1 up master br1 type dummy
 # sleep 1
 # bridge vlan set vid 1 dev swp1 state 4
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # sleep 1
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
1
 # bridge vlan set vid 1 dev swp1 state 3
 # sleep 2
 # ip -j -p stats show dev swp1 group xstats_slave subgroup bridge suite mcast | jq '.[]["multicast"]["igmp_queries"]["tx_v2"]'
3
Signed-off-by Yong Wang <[email protected]>
Reviewed-by Andy Roulin <[email protected]>
Reviewed-by Ido Schimmel <[email protected]>
Signed-off-by Petr Machata <[email protected]>

Quoted 6 lines

---
 net/bridge/br_mst.c       |  4 ++--
 net/bridge/br_multicast.c | 26 ++++++++++++++++++++++++++
 net/bridge/br_private.h   | 11 ++++++++++-
 3 files changed, 38 insertions(+), 3 deletions(-)

Acked-by Nikolay Aleksandrov <[email protected]>

Petr Machata

author

2025-04-17 13:44 UTC #7 lore raw

PATCH 3/3 selftests: net/bridge : add tests for per vlan snooping with stp state changes

In reply to Petr Machata

From: Yong Wang <[email protected]>

Change ALL_TESTS definition to "test-per-line".

Add the test case of per vlan snooping with port stp state change to forwarding and also vlan equivalent case in both bridge_igmp.sh and bridge_mld.sh.

Signed-off-by Yong Wang <[email protected]>

Reviewed-by Andy Roulin <[email protected]>

Reviewed-by Ido Schimmel <[email protected]>

Signed-off-by Petr Machata <[email protected]>

---
 .../selftests/net/forwarding/bridge_igmp.sh   | 80 +++++++++++++++++-
 .../selftests/net/forwarding/bridge_mld.sh    | 81 ++++++++++++++++++-
 tools/testing/selftests/net/forwarding/config |  1 +
 3 files changed, 154 insertions(+), 8 deletions(-)

tools/testing/selftests/net/forwarding/bridge_igmp.sh +76 -4

index e6a3e04fd83f..d4e7dd659354 100755
@@ -1,10 +1,24 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-ALL_TESTS="v2reportleave_test v3include_test v3inc_allow_test v3inc_is_include_test \
-	   v3inc_is_exclude_test v3inc_to_exclude_test v3exc_allow_test v3exc_is_include_test \
-	   v3exc_is_exclude_test v3exc_to_exclude_test v3inc_block_test v3exc_block_test \
-	   v3exc_timeout_test v3star_ex_auto_add_test"
+ALL_TESTS="
+	v2reportleave_test
+	v3include_test
+	v3inc_allow_test
+	v3inc_is_include_test
+	v3inc_is_exclude_test
+	v3inc_to_exclude_test
+	v3exc_allow_test
+	v3exc_is_include_test
+	v3exc_is_exclude_test
+	v3exc_to_exclude_test
+	v3inc_block_test
+	v3exc_block_test
+	v3exc_timeout_test
+	v3star_ex_auto_add_test
+	v2per_vlan_snooping_port_stp_test
+	v2per_vlan_snooping_vlan_stp_test
+"
 NUM_NETIFS=4
 CHECK_TC="yes"
 TEST_GROUP="239.10.10.10"

@@ -554,6 +568,64 @@ v3star_ex_auto_add_test()
 	v3cleanup $swp2 $TEST_GROUP
 }
 
+v2per_vlan_snooping_stp_test()
+{
+	local is_port=$1
+
+	local msg="port"
+	[[ $is_port -ne 1 ]] && msg="vlan"
+
+	ip link set br0 up type bridge vlan_filtering 1 \
+					mcast_igmp_version 2 \
+					mcast_snooping 1 \
+					mcast_vlan_snooping 1 \
+					mcast_querier 1 \
+					mcast_stats_enabled 1
+	bridge vlan global set vid 1 dev br0 \
+					mcast_snooping 1 \
+					mcast_querier 1 \
+					mcast_query_interval 100 \
+					mcast_startup_query_count 0
+	[[ $is_port -eq 1 ]] && bridge link set dev $swp1 state 0
+	[[ $is_port -ne 1 ]] && bridge vlan set vid 1 dev $swp1 state 4
+	sleep 5
+	local tx_s=$(ip -j -p stats show dev $swp1 \
+			group xstats_slave subgroup bridge suite mcast \
+			| jq '.[]["multicast"]["igmp_queries"]["tx_v2"]')
+
+	[[ $is_port -eq 1 ]] && bridge link set dev $swp1 state 3
+	[[ $is_port -ne 1 ]] && bridge vlan set vid 1 dev $swp1 state 3
+	sleep 5
+	local tx_e=$(ip -j -p stats show dev $swp1 \
+			group xstats_slave subgroup bridge suite mcast \
+			| jq '.[]["multicast"]["igmp_queries"]["tx_v2"]')
+
+	RET=0
+	local tx=$(expr $tx_e - $tx_s)
+	test $tx -gt 0
+	check_err $? "No IGMP queries after STP state becomes forwarding"
+	log_test "per vlan snooping with $msg stp state change"
+
+	# restore settings
+	bridge vlan global set vid 1 dev br0 \
+					mcast_querier 0 \
+					mcast_query_interval 12500 \
+					mcast_startup_query_count 2
+	ip link set br0 up type bridge vlan_filtering 0 \
+					mcast_vlan_snooping 0 \
+					mcast_stats_enabled 0
+}
+
+v2per_vlan_snooping_port_stp_test()
+{
+	v2per_vlan_snooping_stp_test 1
+}
+
+v2per_vlan_snooping_vlan_stp_test()
+{
+	v2per_vlan_snooping_stp_test 0
+}
+
 trap cleanup EXIT
 
 setup_prepare

tools/testing/selftests/net/forwarding/bridge_mld.sh +77 -4

93 lines not on this page · raw message

tools/testing/selftests/net/forwarding/config +1 -0

index 8d7a1a004b7c..18fd69d8d937 100644
@@ -1,6 +1,7 @@
 CONFIG_BRIDGE=m
 CONFIG_VLAN_8021Q=m
 CONFIG_BRIDGE_VLAN_FILTERING=y
+CONFIG_BRIDGE_IGMP_SNOOPING=y
 CONFIG_NET_L3_MASTER_DEV=y
 CONFIG_IPV6_MULTIPLE_TABLES=y
 CONFIG_NET_VRF=m

Signature · 1 line

2.49.0

Nikolay Aleksandrov

maintainer Acked-by on v1 3/3

2025-04-19 06:42 UTC #8 lore raw

Re: [PATCH net-next 3/3] selftests: net/bridge : add tests for per vlan snooping with stp state changes

Quoted 12 lines · Petr Machata

From: Yong Wang <[email protected]>
Change ALL_TESTS definition to "test-per-line".
Add the test case of per vlan snooping with port stp state change to forwarding and also vlan equivalent case in both bridge_igmp.sh and bridge_mld.sh.
Signed-off-by Yong Wang <[email protected]>
Reviewed-by Andy Roulin <[email protected]>
Reviewed-by Ido Schimmel <[email protected]>
Signed-off-by Petr Machata <[email protected]>

Quoted 6 lines

---
 .../selftests/net/forwarding/bridge_igmp.sh   | 80 +++++++++++++++++-
 .../selftests/net/forwarding/bridge_mld.sh    | 81 ++++++++++++++++++-
 tools/testing/selftests/net/forwarding/config |  1 +
 3 files changed, 154 insertions(+), 8 deletions(-)

Acked-by Nikolay Aleksandrov <[email protected]>

[email protected]

CI Applied

2025-04-23 12:09 UTC #9 lore raw

In reply to Petr Machata

This series was applied to netdev/net-next.git (main) by David S. Miller <[email protected]>:

Hello:

This series was applied to netdev/net-next.git (main) by David S. Miller <[email protected]>:

Quoted 8 lines · On Thu, 17 Apr 2025 15:43:11 +0200 you wrote:

From: Yong Wang <[email protected]>
The current implementation of br_multicast_enable_port() only operates on port's multicast context, which doesn't take into account in case of vlan snooping, one downside is the port's igmp query timer will NOT resume when port state gets changed from BR_STATE_BLOCKING to BR_STATE_FORWARDING etc.
[...]

Here is the summary with links:
- [net-next,1/3] net: bridge: mcast: re-implement br_multicast_{enable, disable}_port functions

    https://git.kernel.org/netdev/net-next/c/4b30ae9adb04
  - [net-next,2/3] net: bridge: mcast: update multicast contex when vlan state is changed
    https://git.kernel.org/netdev/net-next/c/6c131043eaf1
  - [net-next,3/3] selftests: net/bridge : add tests for per vlan snooping with stp state changes
    https://git.kernel.org/netdev/net-next/c/aea45363e29d

You are awesome, thank you!

Signature · 2 lines

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