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

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Message-ID: <PH0PR11MB5830D9440635CE0E4164BD43D885A@PH0PR11MB5830.namprd11.prod.outlook.com>
Date: Tue, 5 Dec 2023 14:55:17 +0000
From: "Song, Yoong Siang" <yoong.siang.song@...el.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, Jesper Dangaard Brouer
	<hawk@...nel.org>, "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>, "Karlsson, Magnus" <magnus.karlsson@...el.com>,
	"Fijalkowski, Maciej" <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" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"bpf@...r.kernel.org" <bpf@...r.kernel.org>, "xdp-hints@...-project.net"
	<xdp-hints@...-project.net>, "linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>
Subject: RE: [xdp-hints] Re: [PATCH bpf-next v3 3/3] selftests/bpf: add Launch
 Time request to xdp_hw_metadata

On Monday, December 4, 2023 11:00 PM, Willem de Bruijn wrote:
>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

For stmmac, we need to enable per queue launch time support
by using tc qdisc etf offload command.
I believe igc also using the same way.
I will add into documentation to make it clear that
XDP_TXMD_FLAGS_LAUNCH_TIME only used to pass the
launch time value, not enable launch time feature.