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References: <20231015141644.260646-1-akihiko.odaki@daynix.com> <20231015141644.260646-2-akihiko.odaki@daynix.com>
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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Sun, 15 Oct 2023 09:07:49 -0700
Message-ID: <CAADnVQLfUDmgYng8Cw1hiZOMfWNWLjbn7ZGc4yOEz-XmeFEz5Q@mail.gmail.com>
Subject: Re: [RFC PATCH v2 1/7] bpf: Introduce BPF_PROG_TYPE_VNET_HASH
To:     Akihiko Odaki <akihiko.odaki@daynix.com>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <martin.lau@linux.dev>,
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        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
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On Sun, Oct 15, 2023 at 7:17=E2=80=AFAM Akihiko Odaki <akihiko.odaki@daynix=
.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 =3D {
> +       .get_func_proto         =3D sk_filter_func_proto,
> +       .is_valid_access        =3D sk_filter_is_valid_access,
> +       .convert_ctx_access     =3D bpf_convert_ctx_access,
> +       .gen_ld_abs             =3D 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.