linux-kernel - Re: [PATCH RFC v1 net-next 00/12] bridge-fastpath and related improvements

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Message-ID: <137aa23a-db21-43c2-8fb0-608cfe221356@gmail.com>
Date: Tue, 15 Oct 2024 15:32:11 +0200
From: Eric Woudstra <ericwouds@...il.com>
To: Felix Fietkau <nbd@....name>, Nikolay Aleksandrov <razor@...ckwall.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Pablo Neira Ayuso <pablo@...filter.org>,
 Jozsef Kadlecsik <kadlec@...filter.org>, Roopa Prabhu <roopa@...dia.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Jiri Pirko <jiri@...nulli.us>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Lorenzo Bianconi <lorenzo@...nel.org>,
 Frank Wunderlich <frank-w@...lic-files.de>,
 Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 netfilter-devel@...r.kernel.org, coreteam@...filter.org,
 bridge@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC v1 net-next 00/12] bridge-fastpath and related
 improvements

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.

> Because of that, I created this piece of software:
> https://github.com/nbd168/bridger
> 
> It uses an eBPF TC classifier for discovering flows and handling the
> software fast path, and also creates hardware offload rules for flows.
> With that, hardware offloading for bridged LAN->WLAN flows is fully
> supported on MediaTek hardware with upstream kernels.
> 
> - Felix

Thanks, I've seen that already. Nice piece of software, but I'm not
running openwrt. I would like to see a solution implemented in the
kernel, so any operating system can use it.