Re: [PATCH for-next v4] cgroup/bpf: fast path skb BPF filtering

[Pavel Begunkov]

On 1/26/22 20:30, Martin KaFai Lau wrote:
> On Wed, Jan 26, 2022 at 12:22:13AM +0000, Pavel Begunkov wrote:
> >   #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)			      \
> >   ({									      \
> >   	int __ret = 0;							      \
> > -	if (cgroup_bpf_enabled(CGROUP_INET_INGRESS))		      \
> > +	if (cgroup_bpf_enabled(CGROUP_INET_INGRESS) && sk &&		      \
>  From reading sk_filter_trim_cap() where this will be called, sk cannot be NULL.
> If yes, the new sk test is not needed.

Well, there is no sane way to verify how it's used considering

EXPORT_SYMBOL(__cgroup_bpf_run_filter_skb);

but can remove the check if nobody cares


> Others lgtm.
>
> > +	    cgroup_bpf_sock_enabled(sk, CGROUP_INET_INGRESS)) 	      \
> >   		__ret = __cgroup_bpf_run_filter_skb(sk, skb,		      \
> >   						    CGROUP_INET_INGRESS); \
> >   									      \

--
Pavel Begunkov