netdev - Re: [RFC bpf-next 0/7] bpf: netdev TX metadata

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Date: Wed, 14 Jun 2023 09:27:47 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Toke Høiland-Jørgensen <toke@...nel.org>
Cc: Stanislav Fomichev <sdf@...gle.com>, bpf <bpf@...r.kernel.org>, 
	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 <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, 
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Willem de Bruijn <willemb@...gle.com>, David Ahern <dsahern@...nel.org>, 
	"Karlsson, Magnus" <magnus.karlsson@...el.com>, Björn Töpel <bjorn@...nel.org>, 
	"Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>, Network Development <netdev@...r.kernel.org>
Subject: Re: [RFC bpf-next 0/7] bpf: netdev TX metadata

On Wed, Jun 14, 2023 at 5:00 AM Toke Høiland-Jørgensen <toke@...nel.org> wrote:
>
> >>
> >> It's probably going to work if each driver has a separate set of tx
> >> fentry points, something like:
> >>   {veth,mlx5,etc}_devtx_submit()
> >>   {veth,mlx5,etc}_devtx_complete()
>
> I really don't get the opposition to exposing proper APIs; as a
> dataplane developer I want to attach a program to an interface. The
> kernel's role is to provide a consistent interface for this, not to
> require users to become driver developers just to get at the required
> details.

Consistent interface can appear only when there is a consistency
across nic manufacturers.
I'm suggesting to experiment in the most unstable way and
if/when the consistency is discovered then generalize.