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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.
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