linux-kernel - RE: [PATCH bpf-next v2 0/3] xsk: TX metadata txtime support

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Date:   Fri, 1 Dec 2023 13:43:07 +0000
From:   "Song, Yoong Siang" <yoong.siang.song@...el.com>
To:     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: [PATCH bpf-next v2 0/3] xsk: TX metadata txtime support

On Friday, December 1, 2023 6:46 PM, Jesper Dangaard Brouer <hawk@...nel.org> wrote:
>On 12/1/23 07:24, Song Yoong Siang wrote:
>> This series expands XDP TX metadata framework to include ETF HW offload.
>>
>> Changes since v1:
>> - rename Time-Based Scheduling (TBS) to Earliest TxTime First (ETF)
>> - rename launch-time to txtime
>>
>
>I strongly disagree with this renaming (sorry to disagree with Willem).
>
>The i210 and i225 chips call this LaunchTime in their programmers
>datasheets, and even in the driver code[1].
>
>Using this "txtime" name in the code is also confusing, because how can
>people reading the code know the difference between:
>  - tmo_request_timestamp and tmo_request_txtime
>

Hi Jesper and Willem,

How about using "launch_time" for the flag/variable and
"Earliest TxTime First" for the description/comments?  

Thanks & Regards
Siang

>
>[1]
>https://github.com/xdp-project/xdp-
>project/blob/master/areas/tsn/code01_follow_qdisc_TSN_offload.org
>
>> v1:
>https://patchwork.kernel.org/project/netdevbpf/cover/20231130162028.852006-1-
>yoong.siang.song@...el.com/
>>
>> Song Yoong Siang (3):
>>    xsk: add ETF support to XDP Tx metadata
>>    net: stmmac: Add txtime support to XDP ZC
>>    selftests/bpf: Add txtime to xdp_hw_metadata
>>
>>   Documentation/netlink/specs/netdev.yaml        |  4 ++++
>>   Documentation/networking/xsk-tx-metadata.rst   |  5 +++++
>>   drivers/net/ethernet/stmicro/stmmac/stmmac.h   |  2 ++
>>   .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 13 +++++++++++++
>>   include/net/xdp_sock.h                         |  9 +++++++++
>>   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 +
>>   tools/testing/selftests/bpf/xdp_hw_metadata.c  | 18 +++++++++++++++++-
>>   14 files changed, 81 insertions(+), 1 deletion(-)
>>