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

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Date: Mon, 04 Dec 2023 09:59:31 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jesper Dangaard Brouer <hawk@...nel.org>, 
 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

Jesper Dangaard Brouer wrote:
> 
> 
> 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?

Judging from how we currently use this with FQ and ETF, no.

See for instance tools/testing/selftests/net/so_txtime.sh