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

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To: Song Yoong Siang <yoong.siang.song@xxxxxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Bjorn Topel <bjorn@xxxxxxxxxx>, Magnus Karlsson <magnus.karlsson@xxxxxxxxx>, Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>, Jonathan Lemon <jonathan.lemon@xxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, Stanislav Fomichev <sdf@xxxxxxxxxx>, Lorenzo Bianconi <lorenzo@xxxxxxxxxx>, Tariq Toukan <tariqt@xxxxxxxxxx>, Willem de Bruijn <willemb@xxxxxxxxxx>, Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Mykola Lysenko <mykolal@xxxxxx>, Martin KaFai Lau <martin.lau@xxxxxxxxx>, Song Liu <song@xxxxxxxxxx>, Yonghong Song <yonghong.song@xxxxxxxxx>, KP Singh <kpsingh@xxxxxxxxxx>, Hao Luo <haoluo@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>, Jose Abreu <joabreu@xxxxxxxxxxxx>
Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to xdp_hw_metadata
From: Jesper Dangaard Brouer <hawk@xxxxxxxxxx>
Date: Mon, 4 Dec 2023 11:16:48 +0100
Cc: netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, xdp-hints@xxxxxxxxxxxxxxx, linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
In-reply-to: <20231203165129.1740512-4-yoong.siang.song@intel.com>
User-agent: Mozilla Thunderbird



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 HWfor this feature?


--Jesper

Follow-Ups:
- Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to xdp_hw_metadata
  - From: Willem de Bruijn

References:
- [PATCH bpf-next v3 0/3] xsk: TX metadata Launch Time support
  - From: Song Yoong Siang
- [PATCH bpf-next v3 3/3] selftests/bpf: add Launch Time request to xdp_hw_metadata
  - From: Song Yoong Siang

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