linux-kernel - Re: [PATCH v4 net-next 14/14] net: Move per-CPU flush-lists to bpf_net_context on PREEMPT

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Message-ID: <87cyovadxi.fsf@toke.dk>
Date: Wed, 05 Jun 2024 12:20:41 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>, Daniel Bristot de Oliveira
 <bristot@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Daniel Borkmann
 <daniel@...earbox.net>, Eric Dumazet <edumazet@...gle.com>, Frederic
 Weisbecker <frederic@...nel.org>, Ingo Molnar <mingo@...hat.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Peter
 Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>,
 Waiman Long <longman@...hat.com>, Will Deacon <will@...nel.org>, Sebastian
 Andrzej Siewior <bigeasy@...utronix.de>, Björn Töpel
 <bjorn@...nel.org>,
 Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>,
 Eduard Zingerman <eddyz87@...il.com>, Hao Luo <haoluo@...gle.com>, Jesper
 Dangaard Brouer <hawk@...nel.org>, Jiri Olsa <jolsa@...nel.org>, John
 Fastabend <john.fastabend@...il.com>, Jonathan Lemon
 <jonathan.lemon@...il.com>, KP Singh <kpsingh@...nel.org>, Maciej
 Fijalkowski <maciej.fijalkowski@...el.com>, Magnus Karlsson
 <magnus.karlsson@...el.com>, Martin KaFai Lau <martin.lau@...ux.dev>, Song
 Liu <song@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Yonghong Song
 <yonghong.song@...ux.dev>, bpf@...r.kernel.org
Subject: Re: [PATCH v4 net-next 14/14] net: Move per-CPU flush-lists to
 bpf_net_context on PREEMPT_RT.

Sebastian Andrzej Siewior <bigeasy@...utronix.de> writes:

> The per-CPU flush lists, which are accessed from within the NAPI callback
> (xdp_do_flush() for instance), are per-CPU. There are subject to the
> same problem as struct bpf_redirect_info.
>
> Add the per-CPU lists cpu_map_flush_list, dev_map_flush_list and
> xskmap_map_flush_list to struct bpf_net_context. Add wrappers for the
> access.
>
> Cc: "Björn Töpel" <bjorn@...nel.org>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Andrii Nakryiko <andrii@...nel.org>
> Cc: Eduard Zingerman <eddyz87@...il.com>
> Cc: Hao Luo <haoluo@...gle.com>
> Cc: Jesper Dangaard Brouer <hawk@...nel.org>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Jonathan Lemon <jonathan.lemon@...il.com>
> Cc: KP Singh <kpsingh@...nel.org>
> Cc: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Cc: Magnus Karlsson <magnus.karlsson@...el.com>
> Cc: Martin KaFai Lau <martin.lau@...ux.dev>
> Cc: Song Liu <song@...nel.org>
> Cc: Stanislav Fomichev <sdf@...gle.com>
> Cc: Toke Høiland-Jørgensen <toke@...hat.com>
> Cc: Yonghong Song <yonghong.song@...ux.dev>
> Cc: bpf@...r.kernel.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Reviewed-by: Toke Høiland-Jørgensen <toke@...hat.com>