netdev - Re: [PATCH bpf-next v10 09/11] libbpf: implement bpf_prog_query

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Date:   Thu, 23 Jun 2022 15:58:13 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org
Subject: Re: [PATCH bpf-next v10 09/11] libbpf: implement bpf_prog_query_opts

On Wed, Jun 22, 2022 at 09:03:44AM -0700, Stanislav Fomichev wrote:
> Implement bpf_prog_query_opts as a more expendable version of
> bpf_prog_query. Expose new prog_attach_flags and attach_btf_func_id as
> well:
> 
> * prog_attach_flags is a per-program attach_type; relevant only for
>   lsm cgroup program which might have different attach_flags
>   per attach_btf_id
> * attach_btf_func_id is a new field expose for prog_query which
>   specifies real btf function id for lsm cgroup attachments
> 
> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  tools/include/uapi/linux/bpf.h |  3 +++
>  tools/lib/bpf/bpf.c            | 38 +++++++++++++++++++++++++++-------
>  tools/lib/bpf/bpf.h            | 15 ++++++++++++++
>  tools/lib/bpf/libbpf.map       |  1 +
>  4 files changed, 50 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index b7479898c879..ad9e7311c4cf 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -1432,6 +1432,7 @@ union bpf_attr {
>  		__u32		attach_flags;
>  		__aligned_u64	prog_ids;
>  		__u32		prog_cnt;
> +		__aligned_u64	prog_attach_flags; /* output: per-program attach_flags */
>  	} query;
>  
>  	struct { /* anonymous struct used by BPF_RAW_TRACEPOINT_OPEN command */
> @@ -6076,6 +6077,8 @@ struct bpf_prog_info {
>  	__u64 run_cnt;
>  	__u64 recursion_misses;
>  	__u32 verified_insns;
> +	__u32 attach_btf_obj_id;
> +	__u32 attach_btf_id;
>  } __attribute__((aligned(8)));
nit. This could be done together in patch 5.

Acked-by: Martin KaFai Lau <kafai@...com>