linux-kernel - Re: [RFC PATCH v2 1/7] bpf: Introduce BPF_PROG_TYPE_VNET

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Date:   Sun, 15 Oct 2023 09:07:49 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Akihiko Odaki <akihiko.odaki@...nix.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Yuri Benditovich <yuri.benditovich@...nix.com>,
        Andrew Melnychenko <andrew@...nix.com>
Subject: Re: [RFC PATCH v2 1/7] bpf: Introduce BPF_PROG_TYPE_VNET_HASH

On Sun, Oct 15, 2023 at 7:17 AM Akihiko Odaki <akihiko.odaki@...nix.com> wrote:
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 0448700890f7..298634556fab 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -988,6 +988,7 @@ enum bpf_prog_type {
>         BPF_PROG_TYPE_SK_LOOKUP,
>         BPF_PROG_TYPE_SYSCALL, /* a program that can execute syscalls */
>         BPF_PROG_TYPE_NETFILTER,
> +       BPF_PROG_TYPE_VNET_HASH,

Sorry, we do not add new stable program types anymore.

> @@ -6111,6 +6112,10 @@ struct __sk_buff {
>         __u8  tstamp_type;
>         __u32 :24;              /* Padding, future use. */
>         __u64 hwtstamp;
> +
> +       __u32 vnet_hash_value;
> +       __u16 vnet_hash_report;
> +       __u16 vnet_rss_queue;
>  };

we also do not add anything to uapi __sk_buff.

> +const struct bpf_verifier_ops vnet_hash_verifier_ops = {
> +       .get_func_proto         = sk_filter_func_proto,
> +       .is_valid_access        = sk_filter_is_valid_access,
> +       .convert_ctx_access     = bpf_convert_ctx_access,
> +       .gen_ld_abs             = bpf_gen_ld_abs,
> +};

and we don't do ctx rewrites like this either.

Please see how hid-bpf and cgroup rstat are hooking up bpf
in _unstable_ way.