netdev - Re: [PATCH net-next 00/12] Add tc-mqprio and tc-taprio support for preemptible traffic classes

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Message-ID: <20230218152021.puhz7m26uu2lzved@skbuf>
Date:   Sat, 18 Feb 2023 17:20:21 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Gerhard Engleder <gerhard@...leder-embedded.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ferenc Fejes <ferenc.fejes@...csson.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        linux-kernel@...r.kernel.org,
        Pranavi Somisetty <pranavi.somisetty@....com>,
        Harini Katakam <harini.katakam@....com>
Subject: Re: [PATCH net-next 00/12] Add tc-mqprio and tc-taprio support for
 preemptible traffic classes

On Fri, Feb 17, 2023 at 01:21:14AM +0200, Vladimir Oltean wrote:
> The last RFC in August 2022 contained a proposal for the UAPI of both
> TSN standards which together form Frame Preemption (802.1Q and 802.3):
> https://patchwork.kernel.org/project/netdevbpf/cover/20220816222920.1952936-1-vladimir.oltean@nxp.com/
> 
> It wasn't clear at the time whether the 802.1Q portion of Frame Preemption
> should be exposed via the tc qdisc (mqprio, taprio) or via some other
> layer (perhaps also ethtool like the 802.3 portion).
> 
> So the 802.3 portion got submitted separately and finally was accepted:
> https://patchwork.kernel.org/project/netdevbpf/cover/20230119122705.73054-1-vladimir.oltean@nxp.com/
> 
> leaving the only remaining question: how do we expose the 802.1Q bits?
> 
> This series proposes that we use the Qdisc layer, through separate
> (albeit very similar) UAPI in mqprio and taprio, and that both these
> Qdiscs pass the information down to the offloading device driver through
> the common mqprio offload structure (which taprio also passes).
> 
> Implementations are provided for the NXP LS1028A on-board Ethernet
> (enetc, felix).
> 
> Some patches should have maybe belonged to separate series, leaving here
> only patches 09/12 - 12/12, for ease of review. That may be true,
> however due to a perceived lack of time to wait for the prerequisite
> cleanup to be merged, here they are all together.
> 
> Vladimir Oltean (12):
>   net: enetc: rename "mqprio" to "qopt"
>   net: mscc: ocelot: add support for mqprio offload
>   net: dsa: felix: act upon the mqprio qopt in taprio offload
>   net: ethtool: fix __ethtool_dev_mm_supported() implementation
>   net: ethtool: create and export ethtool_dev_mm_supported()
>   net/sched: mqprio: simplify handling of nlattr portion of TCA_OPTIONS
>   net/sched: mqprio: add extack to mqprio_parse_nlattr()
>   net/sched: mqprio: add an extack message to mqprio_parse_opt()
>   net/sched: mqprio: allow per-TC user input of FP adminStatus
>   net/sched: taprio: allow per-TC user input of FP adminStatus
>   net: mscc: ocelot: add support for preemptible traffic classes
>   net: enetc: add support for preemptible traffic classes
> 
>  drivers/net/dsa/ocelot/felix_vsc9959.c        |  44 ++++-
>  drivers/net/ethernet/freescale/enetc/enetc.c  |  31 ++-
>  drivers/net/ethernet/freescale/enetc/enetc.h  |   1 +
>  .../net/ethernet/freescale/enetc/enetc_hw.h   |   4 +
>  drivers/net/ethernet/mscc/ocelot.c            |  51 +++++
>  drivers/net/ethernet/mscc/ocelot.h            |   2 +
>  drivers/net/ethernet/mscc/ocelot_mm.c         |  56 ++++++
>  include/linux/ethtool_netlink.h               |   6 +
>  include/net/pkt_sched.h                       |   1 +
>  include/soc/mscc/ocelot.h                     |   6 +
>  include/uapi/linux/pkt_sched.h                |  17 ++
>  net/ethtool/mm.c                              |  24 ++-
>  net/sched/sch_mqprio.c                        | 182 +++++++++++++++---
>  net/sched/sch_mqprio_lib.c                    |  14 ++
>  net/sched/sch_mqprio_lib.h                    |   2 +
>  net/sched/sch_taprio.c                        |  65 +++++--
>  16 files changed, 459 insertions(+), 47 deletions(-)
> 
> -- 
> 2.34.1
>

Seeing that there is no feedback on the proposed UAPI, I'd be tempted
to resend this, with just the modular build fixed (export the
ethtool_dev_mm_supported() symbol).

Would anyone hate me for doing this, considering that the merge window
is close? Does anyone need some time to take a closer look at this, or
think about a better alternative?