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Date: Sat, 13 Jun 2026 10:20:41 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Kuniyuki Iwashima <kuniyu@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann
 <daniel@iogearbox.net>, Martin KaFai Lau <martin.lau@linux.dev>, Stanislav
 Fomichev <sdf@fomichev.me>, Andrii Nakryiko <andrii@kernel.org>, John
 Fastabend <john.fastabend@gmail.com>, Kumar Kartikeya Dwivedi
 <memxor@gmail.com>, Eduard Zingerman <eddyz87@gmail.com>, Song Liu
 <song@kernel.org>, Yonghong Song <yonghong.song@linux.dev>, Jiri Olsa
 <jolsa@kernel.org>, Andrew Lunn <andrew@lunn.ch>, "David S . Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Paolo Abeni
 <pabeni@redhat.com>, Simon Horman <horms@kernel.org>, Willem de Bruijn
 <willemb@google.com>, Kuniyuki Iwashima <kuni1840@gmail.com>,
 bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH v2 bpf-next/net 0/5] bpf: Support RX/TX HW timestamp
 proxy.
Message-ID: <20260613102041.55e3b50e@kernel.org>
In-Reply-To: <20260613010039.1362312-1-kuniyu@google.com>
References: <20260613010039.1362312-1-kuniyu@google.com>
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On Sat, 13 Jun 2026 00:59:57 +0000 Kuniyuki Iwashima wrote:
> When standard socket applications are run on these hosts,
> a userspace proxy is required to mediate traffic between the
> hardware and the applications.
> 
>             +---------+                 +----------------------+
>             |  proxy  |                 |  socket application  |
>             +---------+                 +----------------------+
>               ^     ^                               ^
>   userspace   |     |                               |
>   -----------| |-----------------------------------------------
>              | |    |    +---------------------+    | skb
>              | |    `--->|  virtual interface  |<---'
>   kernel     | |   skb   +---------------------+
>   -----------| |-----------------------------------------------
>               |
>               v
>        +------------+
>        |  hardware  |
>        +------------+

The first patch looks kinda nonsensical but then I saw this diagram.
Looks like you're vibe coding an integration that makes it easier to
treat netdev as a slow path for a user networking stack.
Please tell me if I'm missing anything otherwise add my nack if you
repost.