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Date: Mon, 04 Dec 2023 09:59:31 -0500
From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Jesper Dangaard Brouer <hawk@kernel.org>, 
 Song Yoong Siang <yoong.siang.song@intel.com>, 
 "David S . Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, 
 Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, 
 Jonathan Corbet <corbet@lwn.net>, 
 Bjorn Topel <bjorn@kernel.org>, 
 Magnus Karlsson <magnus.karlsson@intel.com>, 
 Maciej Fijalkowski <maciej.fijalkowski@intel.com>, 
 Jonathan Lemon <jonathan.lemon@gmail.com>, 
 Alexei Starovoitov <ast@kernel.org>, 
 Daniel Borkmann <daniel@iogearbox.net>, 
 John Fastabend <john.fastabend@gmail.com>, 
 Stanislav Fomichev <sdf@google.com>, 
 Lorenzo Bianconi <lorenzo@kernel.org>, 
 Tariq Toukan <tariqt@nvidia.com>, 
 Willem de Bruijn <willemb@google.com>, 
 Maxime Coquelin <mcoquelin.stm32@gmail.com>, 
 Andrii Nakryiko <andrii@kernel.org>, 
 Mykola Lysenko <mykolal@fb.com>, 
 Martin KaFai Lau <martin.lau@linux.dev>, 
 Song Liu <song@kernel.org>, 
 Yonghong Song <yonghong.song@linux.dev>, 
 KP Singh <kpsingh@kernel.org>, 
 Hao Luo <haoluo@google.com>, 
 Jiri Olsa <jolsa@kernel.org>, 
 Shuah Khan <shuah@kernel.org>, 
 Alexandre Torgue <alexandre.torgue@foss.st.com>, 
 Jose Abreu <joabreu@synopsys.com>
Cc: netdev@vger.kernel.org, 
 linux-kernel@vger.kernel.org, 
 linux-doc@vger.kernel.org, 
 bpf@vger.kernel.org, 
 xdp-hints@xdp-project.net, 
 linux-stm32@st-md-mailman.stormreply.com, 
 linux-arm-kernel@lists.infradead.org, 
 linux-kselftest@vger.kernel.org
Message-ID: <656de953bcc82_2e983e2949a@willemb.c.googlers.com.notmuch>
In-Reply-To: <8e20031c-83cb-4927-ab6a-e6b4840e1e42@kernel.org>
References: <20231203165129.1740512-1-yoong.siang.song@intel.com>
 <20231203165129.1740512-4-yoong.siang.song@intel.com>
 <8e20031c-83cb-4927-ab6a-e6b4840e1e42@kernel.org>
Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to
 xdp_hw_metadata
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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