From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from nbd.name (nbd.name [46.4.11.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB9DF1D88CA; Thu, 17 Oct 2024 09:17:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.4.11.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729156665; cv=none; b=Q74K6E2HT/hohVpDCdDdaUPgFpSIengB4gmJRQbSiMIRgDW8DOk9HSDw+JByNmrMpCdUquxcrDmlhyE57kMmIl57FNwaOVTcNeDKxrrZhu8f73p1Or6fddX1T1up/5S8yX90FTGV3YmZd9FbAG0xk92dKgPBiuW1+5yIl2KyEMA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729156665; c=relaxed/simple; bh=LtUdGluhJQnO5q9WMuZrsQssfT2AVjf8JPJtouetojY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=rxwJtpw4SGh56Tap/KeMjOwKHnjSERY6s+Cm53WTB7DBxu3IRQBVm7qNFKkI9iCPZPwP7l6PPwU1IKjaAtD1T2Rmd867tuWKls2iFjMBJ4swnzCsxM/+/r7WpAtiIXz4NZ4XIbDA3Wsw9ciFZy9I54DqltHso6bVvO4ypZhQwEo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nbd.name; spf=none smtp.mailfrom=nbd.name; dkim=pass (1024-bit key) header.d=nbd.name header.i=@nbd.name header.b=OgRzISqj; arc=none smtp.client-ip=46.4.11.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nbd.name Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=nbd.name Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=nbd.name header.i=@nbd.name header.b="OgRzISqj" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=vyyN1RNPlXPbDrkywEKlZ9/QZaS+KKztH3bMbKcpF+4=; b=OgRzISqjEiT64CW5kkJjlVrIyE Iv+yEA9FPWAumsPKtJ2BfmK1spk6A6bCflS2xdf8BbbgZbF7D5gCxoa8p1EpoKPgDGk8fMVtE6dZK gJIhN7qKY9lhY1YAmDgBtI5kvhfSpockOoJtSQ2kNRvufy979o9fkP9Urj66qzQJCdIo=; Received: from p4ff13b65.dip0.t-ipconnect.de ([79.241.59.101] helo=nf.local) by ds12 with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.96) (envelope-from ) id 1t1Md4-00Amar-0Z; Thu, 17 Oct 2024 11:17:10 +0200 Message-ID: Date: Thu, 17 Oct 2024 11:17:09 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v1 net-next 00/12] bridge-fastpath and related improvements To: Eric Woudstra , Nikolay Aleksandrov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Pablo Neira Ayuso , Jozsef Kadlecsik , Roopa Prabhu , Matthias Brugger , AngeloGioacchino Del Regno , Jiri Pirko , Sebastian Andrzej Siewior , Lorenzo Bianconi , Frank Wunderlich , Daniel Golle Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org References: <20241013185509.4430-1-ericwouds@gmail.com> <9f9f3cf0-7a78-40f1-b8d5-f06a2d428210@blackwall.org> <0b0a92f2-2e80-429c-8fcd-d4dc162e6e1f@nbd.name> <137aa23a-db21-43c2-8fb0-608cfe221356@gmail.com> From: Felix Fietkau Content-Language: en-US Autocrypt: addr=nbd@nbd.name; keydata= xsDiBEah5CcRBADIY7pu4LIv3jBlyQ/2u87iIZGe6f0f8pyB4UjzfJNXhJb8JylYYRzIOSxh ExKsdLCnJqsG1PY1mqTtoG8sONpwsHr2oJ4itjcGHfn5NJSUGTbtbbxLro13tHkGFCoCr4Z5 Pv+XRgiANSpYlIigiMbOkide6wbggQK32tC20QxUIwCg4k6dtV/4kwEeiOUfErq00TVqIiEE AKcUi4taOuh/PQWx/Ujjl/P1LfJXqLKRPa8PwD4j2yjoc9l+7LptSxJThL9KSu6gtXQjcoR2 vCK0OeYJhgO4kYMI78h1TSaxmtImEAnjFPYJYVsxrhay92jisYc7z5R/76AaELfF6RCjjGeP wdalulG+erWju710Bif7E1yjYVWeA/9Wd1lsOmx6uwwYgNqoFtcAunDaMKi9xVQW18FsUusM TdRvTZLBpoUAy+MajAL+R73TwLq3LnKpIcCwftyQXK5pEDKq57OhxJVv1Q8XkA9Dn1SBOjNB l25vJDFAT9ntp9THeDD2fv15yk4EKpWhu4H00/YX8KkhFsrtUs69+vZQwc0cRmVsaXggRmll dGthdSA8bmJkQG5iZC5uYW1lPsJgBBMRAgAgBQJGoeQnAhsjBgsJCAcDAgQVAggDBBYCAwEC HgECF4AACgkQ130UHQKnbvXsvgCgjsAIIOsY7xZ8VcSm7NABpi91yTMAniMMmH7FRenEAYMa VrwYTIThkTlQzsFNBEah5FQQCACMIep/hTzgPZ9HbCTKm9xN4bZX0JjrqjFem1Nxf3MBM5vN CYGBn8F4sGIzPmLhl4xFeq3k5irVg/YvxSDbQN6NJv8o+tP6zsMeWX2JjtV0P4aDIN1pK2/w VxcicArw0VYdv2ZCarccFBgH2a6GjswqlCqVM3gNIMI8ikzenKcso8YErGGiKYeMEZLwHaxE Y7mTPuOTrWL8uWWRL5mVjhZEVvDez6em/OYvzBwbkhImrryF29e3Po2cfY2n7EKjjr3/141K DHBBdgXlPNfDwROnA5ugjjEBjwkwBQqPpDA7AYPvpHh5vLbZnVGu5CwG7NAsrb2isRmjYoqk wu++3117AAMFB/9S0Sj7qFFQcD4laADVsabTpNNpaV4wAgVTRHKV/kC9luItzwDnUcsZUPdQ f3MueRJ3jIHU0UmRBG3uQftqbZJj3ikhnfvyLmkCNe+/hXhPu9sGvXyi2D4vszICvc1KL4RD aLSrOsROx22eZ26KqcW4ny7+va2FnvjsZgI8h4sDmaLzKczVRIiLITiMpLFEU/VoSv0m1F4B FtRgoiyjFzigWG0MsTdAN6FJzGh4mWWGIlE7o5JraNhnTd+yTUIPtw3ym6l8P+gbvfoZida0 TspgwBWLnXQvP5EDvlZnNaKa/3oBes6z0QdaSOwZCRA3QSLHBwtgUsrT6RxRSweLrcabwkkE GBECAAkFAkah5FQCGwwACgkQ130UHQKnbvW2GgCeMncXpbbWNT2AtoAYICrKyX5R3iMAoMhw cL98efvrjdstUfTCP2pfetyN In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 16.10.24 17:59, Eric Woudstra wrote: > > > On 10/15/24 9:44 PM, Felix Fietkau wrote: >> On 15.10.24 15:32, Eric Woudstra wrote: >>> >>> >>> On 10/15/24 2:16 PM, Felix Fietkau wrote: >>>> Hi Eric, >>>> >>>> On 14.10.24 20:29, Eric Woudstra wrote: >>>>> It would be no problem for me to change the subject and body, if you >>>>> think that is better. >>>>> >>>>> The thing is, these patches actually make it possible to set up a fully >>>>> functional software fastpath between bridged interfaces. Only after the >>>>> software fastpath is set up and functional, it can be offloaded, which >>>>> happens to by my personal motivation to write this patch-set. >>>>> >>>>> If the offload flag is set in the flowtable, the software fastpath will >>>>> be offloaded. But in this patch-set, there is nothing that changes >>>>> anything there, the existing code is used unchanged. >>>> >>>> FWIW, a while back, I also wanted to add a software fast path for the >>>> bridge layer to the kernel, also with the intention of using it for >>>> hardware offload. It wasn't accepted back then, because (if I remember >>>> correctly) people didn't want any extra complexity in the network stack >>>> to make the bridge layer faster. >>> >>> Hello Felix, >>> >>> I think this patch-set is a clear showcase it is not very complex at >>> all. The core of making it possible only consists a few patches. Half of >>> this patch-set involves improvements that also apply to the >>> forward-fastpath. >> >> It's definitely an interesting approach. How does it deal with devices >> roaming from one bridge port to another? I couldn't find that in the code. > > It is handled in the same manner when dealing with the forward-fastpath, > with the aid of conntrack. If roaming is problematic, then it would be > for both the forward-fastpath and the bridge-fastpath. I have a topic on > the banana-pi forum about this patch-set, so I think long discussions > about additional details we could have there, keeping the mailing list > more clean. You forgot to include a link to the forum topic :) By the way, based on some reports that I received, I do believe that the existing forwarding fastpath also doesn't handle roaming properly. I just didn't have the time to properly look into that yet. - Felix