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

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Date:   Fri, 1 Dec 2023 00:02:13 +0000
From:   "Song, Yoong Siang" <yoong.siang.song@...el.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.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>,
        "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>,
        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" <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: [PATCH bpf-next 1/3] xsk: add launch time support to XDP Tx
 metadata

On Friday, December 1, 2023 4:29 AM, Willem de Bruijn wrote:
>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).
>

Sure. I will change TBS to ETF in my V2 so that it is aligned with etf command in tc application.