netdev - Re: [PATCH net-next 1/9] net: skb: introduce try_kfree

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Message-ID: <CADxym3b1mj8pNO0RG_A=bWCyg0GDNDTZaTj3GPqtQFSRb8CZxg@mail.gmail.com>
Date:   Mon, 31 Oct 2022 10:35:48 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, imagedong@...cent.com,
        kafai@...com, asml.silence@...il.com, keescook@...omium.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/9] net: skb: introduce try_kfree_skb()

On Sat, Oct 29, 2022 at 11:30 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Sat, Oct 29, 2022 at 6:11 AM <menglong8.dong@...il.com> wrote:
> >
> > From: Menglong Dong <imagedong@...cent.com>
> >
> > In order to simply the code, introduce try_kfree_skb(), which allow
> > SKB_NOT_DROPPED_YET to be passed. When the reason is SKB_NOT_DROPPED_YET,
> > consume_skb() will be called to free the skb normally. Otherwise,
> > kfree_skb_reason() will be called.
> >
> > Signed-off-by: Menglong Dong <imagedong@...cent.com>
> > ---
> >  include/linux/skbuff.h | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 59c9fd55699d..f722accc054e 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -1236,6 +1236,15 @@ static inline void consume_skb(struct sk_buff *skb)
> >  }
> >  #endif
> >
> > +static inline void try_kfree_skb(struct sk_buff *skb,
> > +                                enum skb_drop_reason reason)
> > +{
> > +       if (reason != SKB_NOT_DROPPED_YET)
> > +               kfree_skb_reason(skb, reason);
> > +       else
> > +               consume_skb(skb);
> > +}
> > +
>
> My proposal looks better IMO
>
> https://patchwork.kernel.org/project/netdevbpf/patch/20221028133043.2312984-2-edumazet@google.com/

Hnn...yeah, your idea seems fine, which wont
affect the existing code.