From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f53.google.com (mail-ed1-f53.google.com [209.85.208.53]) (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 28C55235061 for ; Wed, 2 Jul 2025 08:41:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751445712; cv=none; b=UQd6bj8RlLn1TizLpHGgbVuaY3PKZq2GrzDeIvu1YH/Beuy/+1nrdvEozQs1E61TvHZkkzpuTiYKSv8Dz6gd/dSC+A6JIplwAyMWJVDxRLaLULsy7IdF4HBJGhRoXE1QyuoySb0RtpwxRMOJJO9+10wb+jJko4/DZqVs8BI81OE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751445712; c=relaxed/simple; bh=yiZwDP3lXQ5zigCNoF6oAAAWr7zjLZWfVbmf4bcC2SA=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=BnrHXRhkP/DcHzsTdAfBqp+f6+mLYbZFkceS+xw0WhJuHCHC90c5RhIwqQMIOdA/lZLOVX7FesQdKq2ckLKO0+XLufTYh9UecwKdP2ruVIso5Z3hyVsuqPx7Ic4qvJGnsviLQ0Xnr2p2FMiWF2wR0gwezbFdVa3Htpg1KsOVX7w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=waldekranz.com; spf=pass smtp.mailfrom=waldekranz.com; dkim=pass (2048-bit key) header.d=waldekranz-com.20230601.gappssmtp.com header.i=@waldekranz-com.20230601.gappssmtp.com header.b=QmPLTBMq; arc=none smtp.client-ip=209.85.208.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=waldekranz.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=waldekranz.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=waldekranz-com.20230601.gappssmtp.com header.i=@waldekranz-com.20230601.gappssmtp.com header.b="QmPLTBMq" Received: by mail-ed1-f53.google.com with SMTP id 4fb4d7f45d1cf-60702d77c60so13208092a12.3 for ; Wed, 02 Jul 2025 01:41:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=waldekranz-com.20230601.gappssmtp.com; s=20230601; t=1751445708; x=1752050508; darn=vger.kernel.org; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=+g1v0m8aDNnOEfwu4uRQC0dDUg9Qe01yaAwfMhR5CgU=; b=QmPLTBMqcXHZihkwxbLm4jjUDK7jxZn9J29NIVFXpxv+hGPX3Q2GrRVjVaGJLYgyMk +VdBi82Yo6IKDRO7P+TKByyrLhJTl16LZhSczU/AHxZC7oIVWIE7CUQ6aaer2rqmSPP7 8ncQWB/4YnL8wT3E/ZWdCpAyefQvc7iUbb7UcVz1kRaFivOVt6tHC1RNW9kFLJvV8XWl O6pz24YnZlQ50p9I95gBH5Cjj3MozTGyGzgGOxY+jKqHtbkXdN/huP2wmhR8NyZlgycG RHGgE0glj91brhQAvhBISwtJqltJICTd9dvUUvtqgv7e/WP873GTxi+Y/fy0aefGO5oy S3Mg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751445708; x=1752050508; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=+g1v0m8aDNnOEfwu4uRQC0dDUg9Qe01yaAwfMhR5CgU=; b=aM+/R0ZBd9PYn8AeW782vBDGWbBSjgy5DThd2j+WnOr5q5K+GNVkPuTcaAVMaUFjOt gerfObctCwCYNlXcWuNWkiJ7PKQSnXlS1k18VZTWCCNpNA6gQF161C+o2GVBrYx2EvL8 t/zFLJVXANzCFPD2RKRex1Sc12MXcfbCVLPa17z6InQxh/Bu5dLABjveCox8iMQHAUQv PMT2wlEGfsBiJ6VryNIRGI+Z4Gs3+r2xn3CNZnBBXEkjwDQlTP3TPGXl/yQ2qAizDeY6 ncmbufN+pi2N2xo2lEShvaagjUykUcGCCCFIcaZclKYyQx612u8CyhuZue91QcS7HsZe EQsA== X-Forwarded-Encrypted: i=1; AJvYcCWQuEX5M4hJszQ8KSyv3nr8J5tBeRmuGgvEi8DwAT+gUoo5c9HTN9xc1IiP6di9j6m8DDdblPs=@vger.kernel.org X-Gm-Message-State: AOJu0Yx8K6BcnjE54GjL4tHufIAEAR804IAgOCMOxCxJgBtMP2R/A1si D0SpIfUvGGRxeGanjKuQi0zjObqdXC6XGijoiCDJ286zxXfrcN2UI8Gma7MSceVd4x4= X-Gm-Gg: ASbGncve05dW05wtszhwl+S8/HwFStzUOJQ4hA3s75avUMnJds00O2z0k12MjOs9qSx keNLQq0z3ANVXGtReDoR4HJ/0Utw9Sw7UGVrqX618xBb8T0pbiJ/lio2qa8A3oj/KOcZuYtuXXL 4z+z9vBqJsOlWtWs551HV9sJgbO4s9EYj404hoiFe2Q89PwjxdABhKp+S5Vl3njDHQClAztet/h idGSnd+KRN7zzL8k3Tcgu4qDrCrhNqxlk5dtnBl0L9lS38e5LfkXm3woBhKiWayhanoNmPAm8TY 21mCux0ifO/USsML1NurL+2ucgiumOhkMPBGopicA4Emp17IRgcQsNjjtmpHJjt/hsbJwk0LVtU j5JP8qcvDHmvE4aOt X-Google-Smtp-Source: AGHT+IEAT04i+G6dTY7KDU/s2zt7X2lFu59Vom3aNPj/WoKa/U2EndBYJk+f2l1y2tj0gHmlMwt+vg== X-Received: by 2002:a17:907:944e:b0:ad8:9b5d:2c1e with SMTP id a640c23a62f3a-ae3c2c8b851mr204395766b.29.1751445708272; Wed, 02 Jul 2025 01:41:48 -0700 (PDT) Received: from wkz-x13 (h-79-136-22-50.NA.cust.bahnhof.se. [79.136.22.50]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae353659678sm1041760966b.38.2025.07.02.01.41.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jul 2025 01:41:47 -0700 (PDT) From: Tobias Waldekranz To: Joseph Huang , netdev@vger.kernel.org Cc: Joseph Huang , Nikolay Aleksandrov , Ido Schimmel , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Florian Fainelli , Vladimir Oltean , bridge@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH net] net: bridge: Do not offload IGMP/MLD messages In-Reply-To: <20250701193639.836027-1-Joseph.Huang@garmin.com> References: <20250701193639.836027-1-Joseph.Huang@garmin.com> Date: Wed, 02 Jul 2025 10:41:45 +0200 Message-ID: <87a55nyofq.fsf@waldekranz.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On tis, jul 01, 2025 at 15:36, Joseph Huang wrote: > Do not offload IGMP/MLD messages as it could lead to IGMP/MLD Reports > being unintentionally flooded to Hosts. Instead, let the bridge decide > where to send these IGMP/MLD messages. Hi Joseph, Do I understand the situation correctly that this is the case where the local host is sending out reports in response to a remote querier? mcast-listener-process (IP_ADD_MEMBERSHIP) \ br0 / \ swp1 swp2 | | QUERIER SOME-OTHER-HOST So in the above setup, br0 will want to br_forward() reports for mcast-listener-process's group(s) via swp1 to QUERIER; but since the source hwdom is 0, the report is eligible for tx offloading, and is flooded by hardware to both swp1 and swp2, reaching SOME-OTHER-HOST as well? > Fixes: 472111920f1c ("net: bridge: switchdev: allow the TX data plane forwarding to be offloaded") > Signed-off-by: Joseph Huang > --- > net/bridge/br_switchdev.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c > index 95d7355a0407..757c34bf5931 100644 > --- a/net/bridge/br_switchdev.c > +++ b/net/bridge/br_switchdev.c > @@ -18,7 +18,8 @@ static bool nbp_switchdev_can_offload_tx_fwd(const struct net_bridge_port *p, > return false; > > return (p->flags & BR_TX_FWD_OFFLOAD) && > - (p->hwdom != BR_INPUT_SKB_CB(skb)->src_hwdom); > + (p->hwdom != BR_INPUT_SKB_CB(skb)->src_hwdom) && > + !br_multicast_igmp_type(skb); > } > > bool br_switchdev_frame_uses_tx_fwd_offload(struct sk_buff *skb) > -- > 2.49.0