netdev - 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.