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Date:   Fri, 1 Dec 2023 11:46:20 +0100
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Subject: Re: [PATCH bpf-next v2 0/3] xsk: TX metadata txtime support
Content-Language: en-US
To:     Song Yoong Siang <yoong.siang.song@intel.com>,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Bjorn Topel <bjorn@kernel.org>,
        Magnus Karlsson <magnus.karlsson@intel.com>,
        Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
        Jonathan Lemon <jonathan.lemon@gmail.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        John Fastabend <john.fastabend@gmail.com>,
        Stanislav Fomichev <sdf@google.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        Tariq Toukan <tariqt@nvidia.com>,
        Willem de Bruijn <willemb@google.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Andrii Nakryiko <andrii@kernel.org>,
        Mykola Lysenko <mykolal@fb.com>,
        Martin KaFai Lau <martin.lau@linux.dev>,
        Song Liu <song@kernel.org>,
        Yonghong Song <yonghong.song@linux.dev>,
        KP Singh <kpsingh@kernel.org>, Hao Luo <haoluo@google.com>,
        Jiri Olsa <jolsa@kernel.org>, Shuah Khan <shuah@kernel.org>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-doc@vger.kernel.org, bpf@vger.kernel.org,
        xdp-hints@xdp-project.net,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org,
        linux-kselftest@vger.kernel.org
References: <20231201062421.1074768-1-yoong.siang.song@intel.com>
From:   Jesper Dangaard Brouer <hawk@kernel.org>
In-Reply-To: <20231201062421.1074768-1-yoong.siang.song@intel.com>
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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


[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@intel.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(-)
>