From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.aperture-lab.de (mail.aperture-lab.de [116.203.183.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B09E32B9B6; Mon, 2 Mar 2026 05:40:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=116.203.183.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772430057; cv=none; b=VCsqEwm+vjKtvrk7yW8ANjT+zZxlLP4d609TokRk7rku/0+nWp3rsQplJPkSdc1M1n1PThkwDwL0HRW3qF6GPVTbtL53Yr50+oazwNmygzcATIPfmZl1P/mc0peJ1kDagAk0geJLr0woIYjfPURagIK4J4Zy6ZoZQKXAHsBzh/A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772430057; c=relaxed/simple; bh=FM08I9KdPLzqTLMsfX00ulRCGnzCFAkdWqbtUs1yHH0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XEGfnB+ofingALpR8M8rjzkD0NtVdbLY6vy94V6CXvy+BKlOhxCfgVpq5SDDPLsXJh9BdVgE4axfvFVzXIDCTvhAg4FimjMBqlNdHA/0RlJYkC3xBetN/UzTfZLkHu53B+gCMhoYIMY+49869nnsUTJfMIvFL2loKhJF+eRb33c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=c0d3.blue; spf=pass smtp.mailfrom=c0d3.blue; arc=none smtp.client-ip=116.203.183.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=c0d3.blue Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=c0d3.blue Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 50A1854CC71; Mon, 2 Mar 2026 06:40:54 +0100 (CET) From: =?UTF-8?q?Linus=20L=C3=BCssing?= To: bridge@lists.linux.dev Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Nikolay Aleksandrov , Ido Schimmel , Andrew Lunn , Simon Horman , Paolo Abeni , Jakub Kicinski , Eric Dumazet , "David S . Miller" , Kuniyuki Iwashima , Stanislav Fomichev , Xiao Liang , shuah@kernel.org, =?UTF-8?q?Linus=20L=C3=BCssing?= Subject: [PATCH net-next v3 10/14] net: bridge: mcast: track active state, bridge up/down Date: Mon, 2 Mar 2026 06:40:04 +0100 Message-ID: <20260302054008.21638-11-linus.luessing@c0d3.blue> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260302054008.21638-1-linus.luessing@c0d3.blue> References: <20260302054008.21638-1-linus.luessing@c0d3.blue> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 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 --- include/uapi/linux/if_link.h | 8 ++++---- net/bridge/br_multicast.c | 12 ++++++++++++ 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index d963be8679b5..679368784643 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -748,14 +748,14 @@ 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_multicast.c b/net/bridge/br_multicast.c index 02981bcbc389..8eedb98378b6 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -1122,6 +1122,7 @@ static void br_multicast_notify_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 link-local address is configured on the bridge @@ -1138,6 +1139,11 @@ 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; + goto update; + } + if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) { force_inactive = true; goto update; @@ -4405,6 +4411,9 @@ 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); } static void br_multicast_open_locked(struct net_bridge *br) @@ -4452,6 +4461,9 @@ static void __br_multicast_stop(struct net_bridge_mcast *brmctx) timer_shutdown(&brmctx->ip6_other_query.delay_timer); timer_shutdown(&brmctx->ip6_own_query.timer); #endif + + /* bridge interface is down, set multicast state to inactive */ + br_multicast_update_active(brmctx); } void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state) -- 2.51.0