netdev - Re: [PATCH net-next v2 2/3] net/sched: cls_api: Expose tc block ports to the datapath

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Date: Thu, 24 Aug 2023 10:09:22 -0400
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Marcelo Ricardo Leitner <mleitner@...hat.com>
Cc: Victor Nogueira <victor@...atatu.com>, xiyou.wangcong@...il.com, jiri@...nulli.us, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	netdev@...r.kernel.org, vladbu@...dia.com, horms@...nel.org, 
	pctammela@...atatu.com, kernel@...atatu.com
Subject: Re: [PATCH net-next v2 2/3] net/sched: cls_api: Expose tc block ports
 to the datapath

On Wed, Aug 23, 2023 at 1:33 PM Marcelo Ricardo Leitner
<mleitner@...hat.com> wrote:
>
> On Sat, Aug 19, 2023 at 01:35:13PM -0300, Victor Nogueira wrote:
> > The datapath can now find the block of the port in which the packet arrived
> > at. It can then use it for various activities.
>
> I think $subject needs a s/ports//. Because, well, the patch is
> exposing the block, which contains the ports.. The first sentence here
> goes along with this rationale.
>
> more below
>
> >
> > In the next patch we show a simple action that multicasts to all ports
> > excep for the port in which the packet arrived on.
>
> "except"
>

Thanks Marcelo. We'll fix both in the next version.

cheers,
jamal
> > Co-developed-by: Jamal Hadi Salim <jhs@...atatu.com>
> > Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
> > Co-developed-by: Pedro Tammela <pctammela@...atatu.com>
> > Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
> > Signed-off-by: Victor Nogueira <victor@...atatu.com>
> > ---
> >  include/net/sch_generic.h |  4 ++++
> >  net/sched/cls_api.c       | 10 +++++++++-
> >  2 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> > index 824a0ecb5afc..c5defb166ef6 100644
> > --- a/include/net/sch_generic.h
> > +++ b/include/net/sch_generic.h
> > @@ -440,6 +440,8 @@ struct qdisc_skb_cb {
> >       };
> >  #define QDISC_CB_PRIV_LEN 20
> >       unsigned char           data[QDISC_CB_PRIV_LEN];
> > +     /* This should allow eBPF to continue to align */
>
> Not sure if this comment really belongs in here. Up to you but it
> seems better suited in the patch description. Hopefully the next one
> won't do something like:
>
>         /* This should allow eBPF to continue to align */
>         u32                     block_index;
> +       /* This one too */
> +       u32                     my_var;
>
> :-)
>
> > +     u32                     block_index;
> >  };
> >
> >  typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
>