linux-kernel - [PATCH net-next v2 09/14] net: bridge: mcast: track active state, VLAN snooping

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Message-ID: <20260206030123.5430-10-linus.luessing@c0d3.blue>
Date: Fri,  6 Feb 2026 03:52:15 +0100
From: Linus Lüssing <linus.luessing@...3.blue>
To: bridge@...ts.linux.dev
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Ido Schimmel <idosch@...dia.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Simon Horman <horms@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Xiao Liang <shaw.leon@...il.com>,
	Linus Lüssing <linus.luessing@...3.blue>
Subject: [PATCH net-next v2 09/14] net: bridge: mcast: track active state, VLAN snooping

If VLAN aware multicast snooping is enabled then we need to perform a
few extra checks to figure out if multicast snooping is actually enabled
for a specific VLAN, as there is then an additional per VLAN multicast
snooping toggle.

Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>
---
 net/bridge/br_multicast.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 4bdc3838c3dc..2a2f54009e0f 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1143,6 +1143,26 @@ static void br_multicast_update_active(struct net_bridge_mcast *brmctx)
 	if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
 		force_inactive = true;
 
+	if (br_opt_get(brmctx->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
+		/* with per-vlan snooping enabled there is an extra per-vlan
+		 * toggle to enable/disable snooping which we must check
+		 */
+		if (br_multicast_ctx_vlan_global_disabled(brmctx))
+			force_inactive = true;
+
+		/* with per-vlan snooping enabled the non-vlan multicast
+		 * snooping context is inactive
+		 */
+		if (!br_multicast_ctx_is_vlan(brmctx))
+			force_inactive = true;
+	} else {
+		/* with per-vlan snooping disabled a vlan multicast
+		 * snooping context is inactive
+		 */
+		if (br_multicast_ctx_is_vlan(brmctx))
+			force_inactive = true;
+	}
+
 	br_ip4_multicast_update_active(brmctx, force_inactive);
 	br_ip6_multicast_update_active(brmctx, force_inactive);
 
-- 
2.51.0