netdev - Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to xdp_hw

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Message-ID: <8e20031c-83cb-4927-ab6a-e6b4840e1e42@kernel.org>
Date: Mon, 4 Dec 2023 11:16:48 +0100
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Song Yoong Siang <yoong.siang.song@...el.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Jonathan Corbet <corbet@....net>,
 Bjorn Topel <bjorn@...nel.org>, Magnus Karlsson <magnus.karlsson@...el.com>,
 Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
 Jonathan Lemon <jonathan.lemon@...il.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 John Fastabend <john.fastabend@...il.com>,
 Stanislav Fomichev <sdf@...gle.com>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Tariq Toukan <tariqt@...dia.com>, Willem de Bruijn <willemb@...gle.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Andrii Nakryiko <andrii@...nel.org>, Mykola Lysenko <mykolal@...com>,
 Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>,
 Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
 Shuah Khan <shuah@...nel.org>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, bpf@...r.kernel.org, xdp-hints@...-project.net,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to
 xdp_hw_metadata

On 12/3/23 17:51, Song Yoong Siang wrote:
> This patch is tested with stmmac on Intel Tiger Lake platform. Refer to
> result below, the delta between pre-determined launch time and actual HW
> transmit complete time is around 24 us.

Is there any NIC setup (e.g. ethtool/qdisc) requirements to enable HW 
for this feature?

--Jesper