linux-kernel - Re: [PATCH bpf-next 0/9] bpf: cpumap: enable GRO for XDP

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Message-ID: <ZtxTqNLZ2kbb-esH@lore-desk>
Date: Sat, 7 Sep 2024 15:22:48 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>, Daniel Xu <dxu@...uu.xyz>,
	John Fastabend <john.fastabend@...il.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	bpf@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 0/9] bpf: cpumap: enable GRO for XDP_PASS frames

> > On Thu, 5 Sep 2024 19:01:42 +0200 Lorenzo Bianconi wrote:
> > > In particular, the cpumap kthread pinned on cpu 'n' can schedule the
> > > backlog NAPI associated to cpu 'n'. However according to my understanding
> > > it seems the backlog NAPI APIs (in process_backlog()) do not support GRO,
> > > right? Am I missing something?
> > 
> > I meant to use the struct directly, not to schedule it. All you need
> > is GRO - feed it packets, flush it. 
> 
> ack, thx for pointing this out.
> 
> > But maybe you can avoid the netdev allocation and patch 3 in other ways.
> > Using backlog NAPI was just the first thing that came to mind.
> 
> ack, I will look into it.
> 
> Regards,
> Lorenzo

Hi all,

I reworked my previous implementation to add GRO support to cpumap codebase, removing
the dummy netdev dependency and keeping most of the other logic. You can find
the codebase here:
- https://github.com/LorenzoBianconi/bpf-next/commit/e152cf8c212196fccece0b516190827430c0f5f8
I added to the two patches below in order to reuse some NAPI generic code:
- https://github.com/LorenzoBianconi/bpf-next/commit/3c73e9c2f07486590749e9b3bfb8a4b3df4cb5e0
- https://github.com/LorenzoBianconi/bpf-next/commit/d435ce2e1b6a991a6264a5aad4a0374a3ca86a51
I have not run any performance test yet, just functional one.

Regards,
Lorenzo

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