netdev - Re: [PATCHv2 net-next] sched: multicast sched extack messages

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Date:   Tue, 27 Dec 2022 11:23:23 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Vlad Buslov <vladbu@...dia.com>
Subject: Re: [PATCHv2 net-next] sched: multicast sched extack messages

Hi Hangbin,

On Mon, Dec 26, 2022 at 10:58 PM Hangbin Liu <liuhangbin@...il.com> wrote:
>
> Hi Jamal,
> On Mon, Dec 26, 2022 at 11:31:24AM -0500, Jamal Hadi Salim wrote:
> > My only concern is this is not generic enough i.e can other objects
> > outside of filters do this?
> > You are still doing it only for the filter (in tfilter_set_nl_ext() -
> > sitting in cls_api)
> > As i mentioned earlier, actions can also be offloaded independently;
> > would this work with actions extack?
> > If it wont work then perhaps we should go the avenue of using
> > per-object(in this case filter) specific attributes
> > to carry the extack as suggested by Jakub earlier.
>
> Yes, I think we can do it on action objects, e.g. call tfilter_set_nl_ext()
> in tca_get_fill:
>
> tcf_add_notify() - tca_get_fill()
>
> I will rename tfilter_set_nl_ext() to tc_set_nl_ext(). BTW, should we also
> do it in qdisc/ class?
>
> tclass_notify() - tc_fill_tclass()
> qdisc_notify() - tc_fill_qdisc()
>

The only useful cases imo are the ones that do h/w offload. So those two seem
reasonable. Not sure where you place that tc_set_nl_ext() so it is
visible for all.

cheers,
jamal