netdev - Re: [RFC nf-next v2 1/2] netfilter: bpf: support prog update

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Date: Tue, 19 Dec 2023 15:58:13 +0100
From: Florian Westphal <fw@...len.de>
To: "D. Wythe" <alibuda@...ux.alibaba.com>
Cc: Simon Horman <horms@...nel.org>, pablo@...filter.org,
	kadlec@...filter.org, fw@...len.de, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	coreteam@...filter.org, netfilter-devel@...r.kernel.org,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, ast@...nel.org
Subject: Re: [RFC nf-next v2 1/2] netfilter: bpf: support prog update

D. Wythe <alibuda@...ux.alibaba.com> wrote:
> net/netfilter/nf_bpf_link.c:31:22: note: in expansion of macro
> ‘rcu_dereference’
>    31 |  return bpf_prog_run(rcu_dereference((const struct bpf_prog __rcu
> *)nf_link->link.prog), &ctx);
>       |                      ^~~~~~~~~~~~~~~
> 
> So, I think we might need to go back to version 1.
> 
> @ Florian , what do you think ?

Use rcu_dereference_raw().