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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZteAuB-QjYU6PIf7@lore-desk>
Date: Tue, 3 Sep 2024 23:33:44 +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 Fri, 30 Aug 2024 18:24:59 +0200 Alexander Lobakin wrote:
> > * patch 4: switch cpumap from a custom kthread to a CPU-pinned
> >   threaded NAPI;
> 
> Could you try to use the backlog NAPI? Allocating a fake netdev and
> using NAPI as a threading abstraction feels like an abuse. Maybe try
> to factor out the necessary bits? What we want is using the per-cpu 
> caches, and feeding GRO. None of the IRQ related NAPI functionality
> fits in here.

I was thinking allocating a fake netdev to use NAPI APIs is quite a common
approach, but sure, I will looking into it.

Regards,
Lorenzo

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)