linux-kernel - Re: [PATCH v3 net-next 14/15] net: Reference bpf_redirect_info via task_struct on PREEMPT

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Message-ID: <9afab1bb-43d6-4f17-b45d-7f4569d9db70@kernel.org>
Date: Wed, 5 Jun 2024 12:28:08 +0200
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Toke Høiland-Jørgensen <toke@...hat.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 "David S. Miller" <davem@...emloft.net>, 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>,
 Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>,
 Eduard Zingerman <eddyz87@...il.com>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, John Fastabend <john.fastabend@...il.com>,
 KP Singh <kpsingh@...nel.org>, 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 v3 net-next 14/15] net: Reference bpf_redirect_info via
 task_struct on PREEMPT_RT.

On 31/05/2024 12.38, Sebastian Andrzej Siewior wrote:
> On 2024-05-30 00:09:21 [+0200], Toke Høiland-Jørgensen wrote:
>> [...]
>>> @@ -240,12 +240,14 @@ static int cpu_map_bpf_prog_run(struct bpf_cpu_map_entry *rcpu, void **frames,
>>>   				int xdp_n, struct xdp_cpumap_stats *stats,
>>>   				struct list_head *list)
>>>   {
>>> +	struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
>>>   	int nframes;
 >>
>> I think we need to zero-initialise all the context objects we allocate
>> on the stack.
>>
> Okay, I can do that.

Hmm, but how will this affect performance?

--Jesper