netdev - Re: [PATCH v2 net-next ] net/sched: cls_flower add CT_FLAGS

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Message-ID: <20210120234045.GC3863@horizon.localdomain>
Date:   Wed, 20 Jan 2021 20:40:45 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     wenxu <wenxu@...oud.cn>, Jamal Hadi Salim <jhs@...atatu.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next ] net/sched: cls_flower add CT_FLAGS_INVALID
 flag support

On Wed, Jan 20, 2021 at 02:18:41PM -0800, Cong Wang wrote:
> On Tue, Jan 19, 2021 at 12:33 AM <wenxu@...oud.cn> wrote:
> > diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> > index 2d70ded..c565c7a 100644
> > --- a/net/core/flow_dissector.c
> > +++ b/net/core/flow_dissector.c
> > @@ -237,9 +237,8 @@ void skb_flow_dissect_meta(const struct sk_buff *skb,
> >  void
> >  skb_flow_dissect_ct(const struct sk_buff *skb,
> >                     struct flow_dissector *flow_dissector,
> > -                   void *target_container,
> > -                   u16 *ctinfo_map,
> > -                   size_t mapsize)
> > +                   void *target_container, u16 *ctinfo_map,
> > +                   size_t mapsize, bool post_ct)
> 
> Why do you pass this boolean as a parameter when you
> can just read it from qdisc_skb_cb(skb)?

In this case, yes, but this way skb_flow_dissect_ct() can/is able to
not care about what the ->cb actually is. It could be called from
somewhere else too.
That's my rationale on it, not sure if wenxu thought the same.

Thanks,
Marcelo