netdev - Re: [PATCH bpf-next 1/8] meta, bpf: Add bpf programmable meta device

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Message-ID: <122357fd-195e-42cd-8c53-dc759172c2f0@linutronix.de>
Date: Fri, 13 Oct 2023 13:26:30 +0200
From: Florian Kauer <florian.kauer@...utronix.de>
To: Daniel Borkmann <daniel@...earbox.net>, bpf@...r.kernel.org
Cc: netdev@...r.kernel.org, martin.lau@...nel.org, razor@...ckwall.org,
 ast@...nel.org, andrii@...nel.org, john.fastabend@...il.com
Subject: Re: [PATCH bpf-next 1/8] meta, bpf: Add bpf programmable meta device

Hi Daniel,

On 26.09.23 07:59, Daniel Borkmann wrote:
> This work adds a new, minimal BPF-programmable device called "meta" we
> recently presented at LSF/MM/BPF. The latter name derives from the Greek
> μετά, encompassing a wide array of meanings such as "on top of", "beyond".
> Given business logic is defined by BPF, this device can have many meanings.
> The core idea is that BPF programs are executed within the drivers xmit
> routine and therefore e.g. in case of containers/Pods moving BPF processing
> closer to the source.

I have a more general question:
You mentioned in your LSF/MM/BPF talk that you do not plan for XDP support for the "meta device",
because it is already supported in veth.
Does that imply that already today I will get full zerocopy from container via veth to the NIC
(and not only to other containers) by simply opening an AF_XDP socket inside a container?

Thanks,
Florian