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

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Message-ID: <20240905172029.5e9ca520@kernel.org>
Date: Thu, 5 Sep 2024 17:20:29 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Lorenzo Bianconi <lorenzo@...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. 
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.