linux-kernel - Re: [PATCH v3 bpf-next] net: remove check in __cgroup_bpf_run_filter

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Date: Fri, 9 Feb 2024 16:01:21 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: Oliver Crumrine <ozlinuxc@...il.com>
Cc: ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com, 
	andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org, 
	yonghong.song@...ux.dev, kpsingh@...nel.org, haoluo@...gle.com, 
	jolsa@...nel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 bpf-next] net: remove check in __cgroup_bpf_run_filter_skb

On 02/09, Oliver Crumrine wrote:
> Originally, this patch removed a redundant check in
> BPF_CGROUP_RUN_PROG_INET_EGRESS, as the check was already being done in
> the function it called, __cgroup_bpf_run_filter_skb. For v2, it was
> reccomended that I remove the check from __cgroup_bpf_run_filter_skb,
> and add the checks to the other macro that calls that function,
> BPF_CGROUP_RUN_PROG_INET_INGRESS.
> 
> To sum it up, checking that the socket exists and that it is a full
> socket is now part of both macros BPF_CGROUP_RUN_PROG_INET_EGRESS and
> BPF_CGROUP_RUN_PROG_INET_INGRESS, and it is no longer part of the
> function they call, __cgroup_bpf_run_filter_skb.
> 
> Signed-off-by: Oliver Crumrine <ozlinuxc@...il.com>
> 
> v2->v3: Sent to bpf-next instead of generic patch
> v1->v2: Addressed feedback about where check should be removed.
> ---
>  include/linux/bpf-cgroup.h | 7 ++++---
>  kernel/bpf/cgroup.c        | 3 ---
>  2 files changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
> index a789266feac3..b28dc0ff4218 100644
> --- a/include/linux/bpf-cgroup.h
> +++ b/include/linux/bpf-cgroup.h
> @@ -195,10 +195,11 @@ static inline bool cgroup_bpf_sock_enabled(struct sock *sk,
>  #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)			      \
>  ({									      \
>  	int __ret = 0;							      \
> -	if (cgroup_bpf_enabled(CGROUP_INET_INGRESS) &&			      \
> -	    cgroup_bpf_sock_enabled(sk, CGROUP_INET_INGRESS))		      \
> +	if (cgroup_bpf_enabled(CGROUP_INET_INGRESS) &&			      \
> +	    cgroup_bpf_sock_enabled(sk, CGROUP_INET_INGRESS) && sk &&	      \
> +	    sk_fullsock(sk))						      \
>  		__ret = __cgroup_bpf_run_filter_skb(sk, skb,		      \

[..]

> -						    CGROUP_INET_INGRESS);     \
> +						    CGROUP_INET_INGRESS);     \

The bot still can't git-am it. And I can't either. Did you somehow
manually mangle that part above? The original line has less trailing spaces
than what your diff source has, look at:

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/tree/include/linux/bpf-cgroup.h#n201

Can you drop this part? Let the idents stay broken :-)