linux-kernel - Re: [PATCH bpf-next 1/3] xsk: add launch time support to XDP Tx metadata

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Date:   Thu, 30 Nov 2023 15:28:36 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
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>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        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,
        Song Yoong Siang <yoong.siang.song@...el.com>
Subject: Re: [PATCH bpf-next 1/3] xsk: add launch time support to XDP Tx
 metadata

Song Yoong Siang wrote:
> This patch extends the XDP Tx metadata framework to include Time-Based
> Scheduling (TBS) support where the NIC will schedule a packet for
> transmission at a pre-determined time called launch time. The value of
> launch time is communicated from user space to Ethernet driver via
> launch_time field of struct xsk_tx_metadata.
> 
> Suggested-by: Stanislav Fomichev <sdf@...gle.com>
> Signed-off-by: Song Yoong Siang <yoong.siang.song@...el.com>
> ---
>  Documentation/netlink/specs/netdev.yaml      |  4 ++++
>  Documentation/networking/xsk-tx-metadata.rst |  5 +++++
>  include/net/xdp_sock.h                       | 10 ++++++++++
>  include/net/xdp_sock_drv.h                   |  1 +
>  include/uapi/linux/if_xdp.h                  |  9 +++++++++
>  include/uapi/linux/netdev.h                  |  3 +++
>  net/core/netdev-genl.c                       |  2 ++
>  net/xdp/xsk.c                                |  3 +++
>  tools/include/uapi/linux/if_xdp.h            |  9 +++++++++
>  tools/include/uapi/linux/netdev.h            |  3 +++
>  tools/net/ynl/generated/netdev-user.c        |  1 +
>  11 files changed, 50 insertions(+)
> 
> diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
> index 00439bcbd2e3..a602776bbfb4 100644
> --- a/Documentation/netlink/specs/netdev.yaml
> +++ b/Documentation/netlink/specs/netdev.yaml
> @@ -66,6 +66,10 @@ definitions:
>          name: tx-checksum
>          doc:
>            L3 checksum HW offload is supported by the driver.
> +      -
> +        name: launch-time
> +        doc:
> +          HW Time-Based Scheduling (TBS) is supported by the driver.

Can we avoid introducing another term? We already have too many:
launchtime, earliest delivery time (EDT), SO_TXTIME,
pacing offload, earliest txtime first (ETF).