linux-kernel - Re: [PATCH net-next 02/10] net: skb: add SKB_DR

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Message-ID: <CADxym3a4gSszZvJea-WikdquvCfVUMbMVsX_C+zdNqc2t=TGJA@mail.gmail.com>
Date: Wed, 21 Aug 2024 20:55:32 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: Ido Schimmel <idosch@...dia.com>
Cc: kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com, 
	pabeni@...hat.com, dsahern@...nel.org, dongml2@...natelecom.cn, 
	amcohen@...dia.com, gnault@...hat.com, bpoirier@...dia.com, 
	b.galvani@...il.com, razor@...ckwall.org, petrm@...dia.com, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 02/10] net: skb: add SKB_DR_RESET

On Tue, Aug 20, 2024 at 8:24 PM Ido Schimmel <idosch@...dia.com> wrote:
>
> On Thu, Aug 15, 2024 at 08:42:54PM +0800, Menglong Dong wrote:
> > For now, the skb drop reason can be SKB_NOT_DROPPED_YET, which makes the
> > kfree_skb_reason call consume_skb.
>
> Maybe I'm missing something, but kfree_skb_reason() only calls
> trace_consume_skb() if reason is SKB_CONSUMED. With SKB_NOT_DROPPED_YET
> you will get a warning.
>

Yeah, I use this macro to avoid such WARNING. And I'm not sure
if we need this patch now :/

> > In some case, we need to make sure that
> > kfree_skb is called, which means the reason can't be SKB_NOT_DROPPED_YET.
> > Introduce SKB_DR_RESET() to reset the reason to NOT_SPECIFIED if it is
> > SKB_NOT_DROPPED_YET.
> >
> > Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
> > ---
> >  include/net/dropreason-core.h | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
> > index 9707ab54fdd5..8da0129d1ed6 100644
> > --- a/include/net/dropreason-core.h
> > +++ b/include/net/dropreason-core.h
> > @@ -445,5 +445,6 @@ enum skb_drop_reason {
> >                   name == SKB_NOT_DROPPED_YET)                \
> >                       SKB_DR_SET(name, reason);               \
> >       } while (0)
> > +#define SKB_DR_RESET(name) SKB_DR_OR(name, NOT_SPECIFIED)
> >
> >  #endif
> > --
> > 2.39.2
> >