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Message-ID: <43b01013-e78b-417e-b169-91909c7309b1@kernel.org>
Date: Mon, 4 Dec 2023 11:36:30 +0100
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Song Yoong Siang <yoong.siang.song@...el.com>,
"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>, Magnus Karlsson <magnus.karlsson@...el.com>,
Maciej Fijalkowski <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, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, bpf@...r.kernel.org, xdp-hints@...-project.net,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 2/3] net: stmmac: add Launch Time support to
XDP ZC
On 12/3/23 17:51, Song Yoong Siang wrote:
> This patch enables Launch Time (Time-Based Scheduling) support to XDP zero
> copy via XDP Tx metadata framework.
>
> Signed-off-by: Song Yoong Siang<yoong.siang.song@...el.com>
> ---
> drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 ++
As requested before, I think we need to see another driver implementing
this.
I propose driver igc and chip i225.
The interesting thing for me is to see how the LaunchTime max 1 second
into the future[1] is handled code wise. One suggestion is to add a
section to Documentation/networking/xsk-tx-metadata.rst per driver that
mentions/documents these different hardware limitations. It is natural
that different types of hardware have limitations. This is a close-to
hardware-level abstraction/API, and IMHO as long as we document the
limitations we can expose this API without too many limitations for more
capable hardware.
[1]
https://github.com/xdp-project/xdp-project/blob/master/areas/tsn/code01_follow_qdisc_TSN_offload.org#setup-code-driver-igb
This stmmac driver and Intel Tiger Lake CPU must also have some limit on
how long into the future it will/can schedule packets?
People from xdp-hints list must make their voice hear if they want i210
and igb driver support, because it have even-more hardware limitations,
see [1] (E.g. only TX queue 0 and 1 supports LaunchTime). BUT I know
some have this hardware in production and might be motivated to get a
functioning driver with this feature?
--Jesper
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