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Message-ID: <8e20031c-83cb-4927-ab6a-e6b4840e1e42@kernel.org>
Date:   Mon, 4 Dec 2023 11:16:48 +0100
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Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to
 xdp_hw_metadata
Content-Language: en-US
To:     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,
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References: <20231203165129.1740512-1-yoong.siang.song@intel.com>
 <20231203165129.1740512-4-yoong.siang.song@intel.com>
From:   Jesper Dangaard Brouer <hawk@kernel.org>
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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