linux-kernel - Re: [PATCH RFC bpf-next 32/52] bpf, cpumap: switch to GRO from netif_receive_skb

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Message-ID: <6e29dc64-672b-47ba-a874-420c5aa681cf@kernel.org>
Date: Fri, 9 Aug 2024 11:32:09 +0200
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Daniel Xu <dxu@...uu.xyz>, Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>,
 Larysa Zaremba <larysa.zaremba@...el.com>,
 Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
 Björn Töpel <bjorn@...nel.org>,
 Magnus Karlsson <magnus.karlsson@...el.com>,
 Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
 Jonathan Lemon <jonathan.lemon@...il.com>, "toke@...hat.com"
 <toke@...hat.com>, Lorenzo Bianconi <lorenzo@...nel.org>,
 David Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Jesse Brandeburg <jesse.brandeburg@...el.com>,
 John Fastabend <john.fastabend@...il.com>, Yajun Deng
 <yajun.deng@...ux.dev>, Willem de Bruijn <willemb@...gle.com>,
 "bpf@...r.kernel.org" <bpf@...r.kernel.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, xdp-hints@...-project.net,
 kernel-team <kernel-team@...udflare.com>
Subject: Re: [PATCH RFC bpf-next 32/52] bpf, cpumap: switch to GRO from
 netif_receive_skb_list()



On 08/08/2024 22.44, Daniel Xu wrote:
> Hi Lorenzo,
> 
> On Thu, Aug 8, 2024, at 12:54 AM, Lorenzo Bianconi wrote:
>>> Hi Alexander,
>>>
>>> On Tue, Jun 28, 2022, at 12:47 PM, Alexander Lobakin wrote:
[...]
>>>
>>> AFAICT the cpumap + GRO is a good standalone improvement. I think
>>> cpumap is still missing this.
>>>
>>> I have a production use case for this now. We want to do some intelligent
>>> RX steering and I think GRO would help over list-ified receive in some cases.
>>> We would prefer steer in HW (and thus get existing GRO support) but not all
>>> our NICs support it. So we need a software fallback.
>>>
I want to state that Cloudflare is also planning to use cpumap in
production, and (one) blocker is that CPUMAP doesn't support GRO.


>>> Are you still interested in merging the cpumap + GRO patches?
>>
>> Hi Daniel and Alex,
>>
>> Recently I worked on a PoC to add GRO support to cpumap codebase:
>> -
>> https://github.com/LorenzoBianconi/bpf-next/commit/a4b8264d5000ecf016da5a2dd9ac302deaf38b3e
>>    Here I added GRO support to cpumap through gro-cells.
>> -
>> https://github.com/LorenzoBianconi/bpf-next/commit/da6cb32a4674aa72401c7414c9a8a0775ef41a55
>>    Here I added GRO support to cpumap trough napi-threaded APIs (with a
>> some
>>    changes to them).
> 
> Cool!
> 
>>
>> Please note I have not run any performance tests so far, just verified it does
>> not crash (I was planning to resume this work soon). Please let me know if it
>> works for you.
> 
> I’ll try to run an A/B test on your two approaches as well as Alex’s. I’ve still
> got some testbeds with production traffic going thru them.
> 

It is awesome that both Olek and you are stepping up for testing this.
(I'm currently too busy on cgroup rstat lock related work, but more
people will be joining my team this month and I hope they have interest
in contributing to this effort).

--Jesper